JP2002267254A - Hot-water supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot-water supply apparatus, in which the water in a hot-water supply heat-exchanger is prevented from boiling without limiting the burning rate of a burner, while having a desired heating capacity, and at the same time, fluid to be heated in a fluid heat-exchanger can be prevented from boiling. SOLUTION: The hot-water supply apparatus is provided with a fluid- circulating means 21, a hot-water supply circulation means 103, and a liquid- liquid heat-exchanger 100; the means 21 circulates the fluid to be heated between the fluid heat-exchanger 7 and a heat-consuming end D. The means 103 circulates hot water in the hot-water supply heat-exchanger 4 though a hot water-supply path 3 and a water-supply path; the liquid/liquid heat-exchanger 100 heat-exchanges between the fluid to be heated circulated by the means 21 and the water heated by the heat-exchanger 4, and heat-exchange between the water circulated by the means 103 and the fluid to be heated by heat exchanger 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply heat exchanger for heating water supplied through a water supply passage by burning a burner to supply hot water to the hot water supply passage, and to supply the heat-supplied fluid supplied through the inlet passage to the burner. A heat exchanger for fluid which is heated by the combustion of the fluid and flows out to the outlet path is provided, and the heat exchanger for hot water supply and the heat exchanger for fluid are integrally formed in a state of conducting heat mutually. Related to the device.

[0002]

2. Description of the Related Art In such a hot water supply apparatus, for example, a heat exchanger for hot water supply and a heat exchanger for fluid are integrally formed in a state of conducting heat mutually, and the heat exchanger for fluid is supplied from a bathtub. The bathtub hot water supplied through the path and supplied into the bathtub through the exit path is heated, and the hot water supply and the reheating of the bathtub hot water are performed by a single burner. In this type of hot water supply apparatus, the water is supplied to the hot water supply heat exchanger, and the supply of the fluid to be heated to the fluid heat exchanger is stopped from the heat consuming terminal. The fluid to be heated in the heat exchanger for heating will also be heated,
Since the fluid to be heated stagnates in the heat exchanger for fluid, the fluid to be heated may be boiled, and the fluid to be heated is supplied to the heat exchanger for fluid, and the hot water is supplied from the heat exchanger for hot water supply. In the fluid independent heating state in which the hot water supply to the road is stopped, the hot water in the hot water supply heat exchanger is also heated. However, since the hot water stays in the hot water supply heat exchanger, the hot water may boil. There is.

[0003] Therefore, the conventional hot water supply apparatus includes a fluid circulating means for circulating a fluid to be heated between the fluid heat exchanger and a bathtub or a heating device as a heat consuming terminal, and heating by the hot water supply heat exchanger. A liquid-liquid heat exchanger for exchanging heat between water before being heated and a fluid to be heated heated by the fluid heat exchanger, and detecting a temperature of water in the hot-water supply heat exchanger. By providing a boiling detection thermistor, it is possible to prevent boiling of the fluid to be heated in the fluid heat exchanger in the hot water supply alone heating state, and to prevent boiling of hot water in the hot water supply heat exchanger in the fluid single heating state. (For example, JP-A-10-122652).

[0004] In addition, in the hot-water supply only heating state, the fluid circulating means is operated to cause the fluid to be heated in the fluid heat exchanger to flow, thereby causing the fluid to be heated in the liquid-liquid heat exchanger. By exchanging heat with the water before being heated by the hot water supply heat exchanger, the temperature rise of the fluid to be heated is suppressed and the boiling of the fluid to be heated is prevented. Also, in the fluid alone heating state, when the temperature detected by the hot water supply boiling detection thermistor is equal to or higher than the boiling set temperature,
The amount of combustion of the burner is reduced to limit the amount of combustion of the burner, thereby preventing boiling of hot water in the hot water supply heat exchanger.

[0005]

In the above conventional hot water supply apparatus, in the hot water supply alone heating state, the fluid circulation means is operated to heat the fluid to be heated by the liquid-to-liquid heat exchanger and the hot water supply heat exchanger. By exchanging heat with water before
Since the boiling of the fluid to be heated is prevented, the boiling of the fluid to be heated can be prevented without limiting the combustion amount of the burner. However, when the temperature detected by the hot water supply boiling detection thermistor is equal to or higher than the set temperature for boiling in the fluid alone heating state, the amount of combustion in the burner is reduced to prevent the boiling water in the hot water supply heat exchanger. Therefore, the combustion amount of the burner is limited, and there is a possibility that a desired heating capacity cannot be obtained.

The present invention has been made in view of such a point, and an object of the present invention is to obtain a desired heating capacity without restricting the combustion amount of a burner and to obtain water in a hot water supply heat exchanger. An object of the present invention is to provide a hot water supply device that can prevent boiling and can prevent boiling of a fluid to be heated in a fluid heat exchanger.

[0007]

According to the first aspect of the present invention, there is provided a hot water supply system in which water supplied through a water supply passage is heated by burning a burner and supplied to the hot water supply passage. A heat exchanger, and a fluid heat exchanger that heats the fluid to be heated supplied through the inlet by burning the burner and flows out to the outlet, and the heat exchanger for hot water supply and the heat exchanger for fluid are provided. And a water heater in which the fluid to be heated is circulated between the heat exchanger for fluid and a heat consuming terminal, wherein A hot water supply circulating means for circulating hot water in the hot water supply heat exchanger through the hot water supply path and the water supply path is provided, and the heating target fluid circulated by the fluid circulating means and the hot water supply heat exchanger Before being heated Liquid heat exchange between the hot water and the hot water circulated by the hot water supply circulating means and the fluid to be heated heated by the fluid heat exchanger An exchanger is provided.

[0008] That is, a fluid circulating means and a hot water circulating means are provided, and a liquid-to-liquid heat exchanger is provided with a fluid to be heated circulated by the fluid circulating means and a water heated by the hot water supplying heat exchanger. And heat exchange between the hot water and the hot fluid circulated by the hot water supply circulating means and the fluid to be heated heated by the fluid heat exchanger. By providing a fluid circulation circuit including a heating bypass path for supplying a heating target fluid to the input path on the outgoing path and operating the fluid circulating means, the heating target fluid is supplied to the fluid including the fluid heat exchanger and the heating bypass path. Circulating in the circulation circuit, the liquid-liquid heat exchanger can exchange heat between the fluid to be heated circulated by the circulating means for fluid and the water heated by the heat exchanger for hot water supply. And activate the hot water circulation means The hot water in the hot water supply heat exchanger is circulated through the hot water supply passage and water supply passage, the liquid-liquid heat exchanger,
Heat exchange can be performed between hot water circulated by the hot water supply circulating means and the fluid to be heated, which is heated by the fluid heat exchanger.

[0009] Therefore, in the hot water supply single heating state in which water is supplied to the hot water supply heat exchanger and supply of the fluid to be heated to the fluid heat exchanger is stopped from the heat consuming terminal, the fluid circulation means is provided. To circulate the fluid to be heated in the fluid circulation circuit including the heat exchanger for fluid and the heating bypass, and the fluid to be heated in the liquid-liquid heat exchanger and the water heated by the heat exchanger for hot water supply. And by exchanging heat, the temperature rise of the fluid to be heated can be suppressed, and the boiling of the fluid to be heated in the fluid heat exchanger can be prevented. Moreover,
The heat exchange between the fluid to be heated in the liquid-liquid heat exchanger and the water heated in the hot water supply heat exchanger makes it possible to preheat the water heated in the hot water supply heat exchanger, It is possible to improve the value obtained by dividing the performance (heating capacity) by the amount of energy input to the device, so-called efficiency.

Further, in a fluid independent heating state in which the fluid to be heated is supplied to the fluid heat exchanger and the hot water supply from the hot water supply heat exchanger to the hot water supply path is stopped, the hot water supply circulation means is operated. The water in the hot water supply heat exchanger is circulated through the hot water supply path and the water supply path, and the liquid-water heat exchanger exchanges heat with the hot water to be heated by the fluid heat exchanger, thereby increasing the temperature of the hot water. And it is possible to prevent boiling of hot water in the hot water supply heat exchanger.

In summary, according to the first aspect of the present invention, the circulating means for fluid or the circulating means for hot water supply is operated and heat is exchanged in the liquid-to-liquid heat exchanger. Since it is possible to prevent the boiling of water in the heat exchanger and the boiling of the fluid to be heated in the fluid heat exchanger, it is possible to achieve a desired heating capacity without restricting the combustion amount of the burner. While obtaining, it has been possible to provide a hot water supply apparatus capable of preventing boiling of water in the heat exchanger for hot water supply and preventing boiling of the fluid to be heated in the heat exchanger for fluid.

According to the second aspect of the present invention, the hot water supply heat exchanger includes a hot water supply sensible heat exchange section that recovers sensible heat of the combustion exhaust gas from the burner, and the hot water supply sensible heat exchange section. A hot water supply latent heat exchange unit that is disposed on the downstream side in the flow direction of the combustion exhaust gas of the burner and recovers latent heat of the combustion exhaust gas of the burner. A fluid sensible heat exchange section for recovering the sensible heat of the flue gas of the burner; and a sensible heat exchange section for the fluid disposed downstream of the sensible heat exchange section for the fluid in the flow direction of the burner flue gas. And a fluid latent heat exchange section for recovering the latent heat of the fluid.

That is, the hot water supply heat exchanger includes a hot water supply sensible heat exchange section and a hot water supply latent heat exchange section, and the fluid heat exchanger comprises a fluid sensible heat exchange section and a fluid sensible heat exchange section. The heat exchanger for hot water supply can collect not only the sensible heat of the flue gas but also the latent heat of the flue gas, and the fluid heat exchanger. However, in addition to the sensible heat of the flue gas, the latent heat of the flue gas can be recovered, and the efficiency of the entire device can be effectively improved. It becomes possible.

According to the third aspect of the present invention, the hot water supply sensible heat exchange section and the fluid sensible heat exchange section are integrally formed so as to conduct heat to each other, and the hot water supply The latent heat heat exchanging section for fluid and the latent heat exchanging section for fluid are integrally formed in a state of conducting heat mutually.

That is, by the cooperation with claim 2,
In order to improve the efficiency, the heat exchanger for hot water supply is simply provided with a sensible heat heat exchange section for hot water supply and a latent heat heat exchange section for hot water supply, and the heat exchanger for fluid is replaced with sensible heat exchange for fluid. Not only comprises a unit and a fluid latent heat exchange unit, but also the hot water supply sensible heat exchange unit and the fluid sensible heat exchange unit are integrally formed in a state of conducting heat to each other, and Since the hot water supply latent heat heat exchange section and the fluid latent heat heat exchange section are integrally formed so as to conduct heat to each other, the hot water supply sensible heat exchange section and the fluid sensible heat exchange section are separated from each other. In this case, the apparatus can be made more compact as compared with a case where the hot water supply latent heat exchange section and the fluid latent heat exchange section are formed separately.

According to the fourth aspect of the present invention, the fluid heat exchanger is supplied from the heat consuming terminal through the inlet as the fluid to be heated and supplied to the heat consuming terminal through the outlet. Bath circulating means configured to heat the heat medium to be heated, and circulate hot and cold water in the bathtub through a bath return path and a bath outgoing path, the heat medium heated by the fluid heat exchanger, and the bath A bath-heating liquid-liquid heat exchanger for exchanging heat with the hot and cold water in the bathtub circulated by the circulating means is provided.

That is, the fluid heat exchanger is configured to heat the heat medium circulating and supplied to the heat consuming terminal, and the heat medium heated by the fluid heat exchanger is circulated by the bath circulating means. Since the liquid-liquid heat exchanger for exchanging heat between the bathtub and the hot water is provided, the liquid-liquid heat exchanger and the burner provided for supplying the heat medium to the heat consuming terminal are used, and the liquid-liquid heat exchanger is used. It becomes possible to heat the bathtub hot water with the exchanger and perform additional heating of the bathtub hot water. Therefore, the heating means for supplying the heat medium to the heat consuming terminal and the heating means for reheating the bath water can be shared by a single burner. In this way, it is possible to supply the heat medium to the heat consuming terminal and reheat the bath water.

Then, by the cooperation with claim 1,
With a single burner, it becomes possible to perform hot water supply, supply of heat medium to the heat consuming terminal, and reheating of bath water.
It is possible to provide a very compact hot water supply apparatus capable of performing hot water supply, supply of a heat medium to a heat consuming terminal, and additional heating of bath water.

According to the fifth aspect of the present invention, there is provided a bypass for supplying water supplied through the water supply passage to the hot water supply passage, bypassing the hot water supply heat exchanger, and providing the hot water supply heat exchange. The hot water and the water from the bypass are mixed by heating the hot water in the vessel, and the hot water is supplied through the hot water supply path.

That is, part of the water supplied through the water supply path is supplied to the hot water supply heat exchanger, and the remaining part is supplied to the bypass path. After mixing with the water from the channel, hot water can be supplied through the hot water channel, so that the total amount of water supplied through the water channel is supplied to the hot water heat exchanger. Water flow to the exchanger can be reduced,
By increasing the temperature of hot water inside the hot water supply heat exchanger, dew condensation of the hot water supply heat exchanger can be prevented, and the durability of the hot water supply heat exchanger can be improved.

According to the invention described in claim 6, control means for controlling the combustion of the burner is provided, and the control means supplies the water to the hot water supply heat exchanger, In the hot water supply only heating state in which the supply of the fluid to be heated to the heat exchanger from the heat consuming terminal is stopped, the heating circulated by the fluid circulating means based on the combustion amount of the burner. In order to adjust the amount of the target fluid, control the operating state of the fluid circulation means, and,
The supply of the fluid to be heated to the fluid heat exchanger is performed, and in a fluid-only heating state in which hot water supply from the hot water supply heat exchanger to the hot water supply path is stopped, the heating amount is determined based on a combustion amount of the burner. The operating state of the hot water circulation means is controlled so as to adjust the amount of the hot water circulated by the hot water circulation means.

That is, the control means adjusts the operating state of the fluid circulating means so as to adjust the amount of the fluid to be circulated by the fluid circulating means based on the combustion amount of the burner in the hot water supply alone heating state. And controlling the operation state of the hot water supply circulation means so as to adjust the amount of hot water circulated by the hot water supply circulation means based on the combustion amount of the burner in the fluid independent heating state. Since it is configured, the control means, according to the burner combustion amount,
It is possible to change the operation state of the fluid circulation means or the operation state of the hot water supply circulation means. Therefore, for example, the control means may change the operating state of the fluid circulating means or the hot water circulating means such that the greater the burned amount of the burner, the greater the capacity of the fluid circulating means or the hot water circulating means. It is possible to minimize the amount of electric power supplied to the fluid circulating means or the hot water circulating means as compared with the case where the fluid circulating means or the hot water circulating means is operated in a constant operating state such as the maximum capacity. In addition, the running cost can be reduced, and the generation of noise due to the operation of the fluid circulation means or the hot water circulation means can be minimized.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hot water supply apparatus according to the present invention will be described with reference to the drawings. [First Embodiment] As shown in FIGS. 1 and 2, this hot water supply apparatus heats water supplied through a water supply passage 1 by burning a burner 2 and supplies hot water to a hot water supply passage 3. The heat medium supplied through the heating return path 5 is supplied to the burner 2
The fluid heat exchanger 7 which is heated by the combustion of the water and flows out to the high-temperature heating path 6, the liquid heat for bath heating for exchanging heat between the heat medium heated by the fluid heat exchanger 7 and the bath water The burner 2, the hot water supply heat exchanger 4, the fluid heat exchanger 7, and the bath heating liquid / liquid heat exchanger 35 each include a casing T.
It is provided within.

The hot water supply heat exchanger 4 is connected at its inlet side to a water supply path 1 connected to a water pipe, and at its outlet side to a hot water supply path 3 connected to a hot water tap (not shown). The water supplied through the water supply channel 1 is heated by the combustion of the burner 2 and supplied to the hot water supply channel 3 to perform general hot water supply or hot water filling.

The water supply channel 1 is provided with a water filter 8, a water supply thermistor 9 for detecting a water supply temperature, and a water amount sensor 10 for detecting a water supply amount in order from the upstream side. A bypass path 11 for bypassing the exchanger 4 and supplying the hot water path 3 is provided.
Is connected to the hot water supply path 3 by branching a downstream side of the water flow sensor 10 in the water supply path 1.

The hot water supply path 3 includes a hot water supply thermistor 12 for detecting the temperature of hot water from the hot water supply heat exchanger 4, a hot water supply from the hot water supply heat exchanger 4, and a bypass path 11.
Mixing valve 13, which adjusts the mixing ratio with water from
A mixing thermistor 14 for detecting the temperature of the hot and cold water after being mixed by the mixing valve 13; a water proportional valve 15 for adjusting the amount of hot and cold water supplied through the hot water supply passage 3; A pressure prevention device 17 is provided. The mixing valve 13 is provided at a connection portion between the bypass path 11 and the hot water supply path 3. In the hot water supply path 3, a mixing section 18 between the water proportional valve 15 and the interrupted water amount sensor 16 connects a hot water filling path 18 for bath. It has branched.

That is, a bypass 11 is provided for supplying water supplied through the water supply channel 1 to the hot water supply channel 3 bypassing the hot water supply heat exchanger 4. The water from the bypass 11 is mixed to supply hot water through the hot water supply path 3. In addition, a part of the water supplied through the water supply path 1 is supplied to the hot water supply heat exchanger 4, and the remaining part is supplied to the bypass path 11.
And the hot water supplied by the hot water supply heat exchanger 4 is mixed with the water from the bypass passage 11, and then the hot water is supplied through the hot water supply passage 3.
The amount of water flowing into the heat exchanger 4 can be reduced, and by increasing the temperature of the hot water inside the heat exchanger 4 for hot water supply, dew condensation on the heat exchanger 4 for hot water supply can be prevented, and the durability of the heat exchanger 4 for hot water supply can be improved. Becomes possible.

A circulation bypass passage 102 for circulating hot water in the hot water supply heat exchanger 4 through the hot water supply passage 3 and the water supply passage 1 is provided.
02 is provided with a hot water supply pump 103 as a hot water supply circulating means.
A check valve 10 for preventing water from flowing into the hot water supply pump 103 when hot water is used, or preventing hot water from flowing into the bypass passage 11 when the hot water supply pump 103 is operated.
4 are provided. The circulation bypass path 102 is
The hot water supply channel 3 is configured to branch off on the upstream side of the hot water supply thermistor 9, and to connect its end downstream of the branch portion of the bypass 11 in the water supply channel 1.

The fluid heat exchanger 7 is connected to a heating return path 5 as an inlet at the inlet side, and connected to a high-temperature heating outgoing path 6 as an outlet at the outlet side, and supplied through the heating return path 5. The heating medium is heated by the combustion of the burner 2, flows out to the high-temperature heating outgoing passage 6, and supplies the heating medium to the heating terminal D as a heat consuming terminal.

In the heating return path 5, in order from the upstream side,
A heating return thermistor 19, a makeup water tank 20, and a heating pump 21 as a fluid circulation means are provided, and a heating outgoing high temperature thermistor 22 is provided in the high temperature heating outgoing passage 6 near the fluid heat exchanger 7. . In the heating return path 5, from a portion downstream of the heating pump 21,
A low-temperature heating path 23 that supplies a heat medium to a low-temperature heating terminal D2 (for example, a floor heating device) is branched, and the low-temperature heating path 23 is provided with a heating low-temperature thermistor 24. Further, a heating bypass 6a for supplying the heat medium in the high-temperature heating outgoing path 6 to the heating return path 5 by bypassing the high-temperature heating terminal D1 (for example, an indoor heating device) is provided. It is connected upstream of the heating return thermistor 19 in the return path 5.

The make-up water tank 20 is connected to a make-up water passage 25 branched from a location between the water filter 8 and the water supply thermistor 9 in the water supply passage 1, and is connected to an overflow passage 26. Is provided with a makeup water valve 27 and a makeup water solenoid valve 28. The makeup water tank 20 is provided with an upper limit sensor 29 for detecting the upper limit of the water level and a lower limit sensor 30 for detecting the lower limit of the water level. The lower limit sensor 30 detects that the water level of the makeup water tank 20 is at the lower limit. Then, until the upper limit sensor 29 detects that the water level in the makeup water tank 20 is at the upper limit, the opening and closing of the makeup water solenoid valve 28 is controlled so that water is supplied to the makeup water tank 20 through the makeup water channel 25. It is configured to be.

A high-temperature heating terminal D1 is connected to the high-temperature heating path 6 and the heating return path 5, and the low-temperature heating path 2 is connected to the high-temperature heating terminal D1.
A low-temperature heating terminal D2 is connected to 3 and the heating return path 5, and a heat-consuming terminal is constituted by a high-temperature heating terminal D1 and a low-temperature heating terminal D2. And the heating pump 21
, The hot and cold water in the makeup water tank 20 flows through the heating return path 5, and a part of the hot water flows around the fluid heat exchanger 7 and passes through the low-temperature heating outgoing path 23, and the low-temperature heating terminal D 2.
And the remainder flows into the heat exchanger for fluid 7, and the hot water heated by the heat exchanger 7 for fluid is supplied to the high-temperature heating terminal D1 through the high-temperature heating outgoing path 6, and from the high-temperature heating terminal D1. Both the returning hot water and the hot water returning from the low-temperature type heating terminal D2 are returned to the makeup water tank 20 through the heating return path 5.

A bath adapter A provided in the bathtub A is connected to a bath return path portion 32 and a bath going path portion 33, and the bath pump 3 provided in the bath return path portion 32 is connected to the bath pump A.
By operating the bath 4, the bathtub hot and cold water is supplied to the bath circulation path 36 including the bath return path section 32 and the bath going path section 33.
It is configured to circulate through. A bath pump 34 is provided as a bath circulating means, and is used for bath heating for exchanging heat between the heat medium heated by the fluid heat exchanger 7 and the bath tub circulated by the operation of the bath pump 34. A liquid-to-liquid heat exchanger 35 is provided.

In the bath heating liquid / liquid heat exchanger 35, a bath heating passage 37 and a bath circulation passage 36 branched from the high temperature heating passage 6 are partially connected to each other. The inside is a concentric double pipe structure with the bath circulation path 36 outside. The bath-heating liquid-liquid heat exchanger 35 is configured such that the flow direction of the heat medium in the bath heating outgoing passage 37 and the flow direction of the bathtub hot water in the bath circulation passage 36 are opposite to each other. .

That is, the fluid heat exchanger 7 uses the high-temperature heating terminal D1 or the low-temperature heating terminal D2 as the fluid to be heated.
Is supplied through the heating return path 5 to heat the heat medium supplied to the high-temperature heating terminal D1 and the low-temperature heating terminal D2 through the high-temperature heating outgoing path 6 and the low-temperature heating outgoing path 23. A bath pump 34 and a bath circulation path 36 circulating through the return path part 32 and the bath going path part 33 are provided, and the heat medium heated by the fluid heat exchanger 7 and the bath pump 34 and the bath circulation path 36
A bath-heating liquid-liquid heat exchanger 35 for exchanging heat with the bathtub hot and cold water circulated by the bath is provided.

The bath heating path 37 is provided with a bath heating valve 38 on the upstream side of the bath heating liquid-liquid heat exchanger 35 in the flow direction of the heat medium. By opening and closing 38, it is configured to switch between a state in which the heat medium heated in the fluid heat exchanger 7 is supplied to the bath heating liquid / liquid heat exchanger 35 and a state in which the heat medium is not supplied.

In the bath return path portion 32, the bath return path portion 3
2, a pressure detection type water level sensor 39 for detecting the water level in the bathtub A based on the pressure acting on the bath 2, and the bath return thermistor 4.
A bath two-way valve 41 for opening and closing the bath return path portion 32, a bath pump 34, and a water flow switch 42 are provided. The bath going path portion 33 is provided with a bath going thermistor 43.

The hot water supply path 18 for supplying bath water from the hot water supply path 3 to the bathtub A is provided with a bath return path portion 32.
, A bath breaker 44, a pouring solenoid valve 45 that opens and closes the hot water path 18 are connected to the hot water path 18 in this order from the upstream side, A hot water check valve 46 is provided.

Then, the hot water from the hot water supply heat exchanger 4 is
After mixing with water from the bypass path 11 by the mixing valve 13, the hot water is supplied to the bath tub A through the hot water supply path 3, the hot water filling path 18, the bath return path part 32 and the bath going path part 33 to fill the bath. It is configured as follows. By operating the bath pump 34, the bathtub hot water is circulated between the bath heating liquid / liquid heat exchanger 35 and the bathtub A through the bath return path portion 32 and the bath going path portion 33, and the bath heat By opening the valve 38 and operating the heating pump 21, the heat medium heated by the fluid heat exchanger 7 is supplied to the bath heating liquid / liquid heat exchanger 35 through the bath heating going path 37. By doing so, the bathtub hot water is heated by the heat medium in the bath heating going path 37, and the bathtub hot water is additionally heated.

The burner 2, as shown in FIGS.
It is a multi-stage gas burner, in which the direction of formation of the flame is directed downward, the hot water supply heat exchanger 4 and the fluid heat exchanger 7 share a single burner 2, and the burner 2 is provided in a burner case 47. And the hot water supply heat exchanger 4 and the fluid heat exchanger 7
Is disposed downstream of the burner 2 in the flow direction of the combustion exhaust gas of the burner 2, that is, below the burner 2. A fan 48 for supplying combustion air to the burner 2
In the vicinity of the burner 2, an igniter 53 for igniting the burner 2, a frame rod 54 for detecting ignition of the burner 2, and the like are provided.

A gas supply passage 49 for supplying general household fuel gas to the burner 2 is branched into three systems and connected to the burner 2, and a gas switching electromagnetic valve 50 is provided at each gas supply passage branch portion 49a. Have been. Then, in the gas supply path 49 on the upstream side of the branch point, in order from the upstream side,
An original gas solenoid valve 52 for interrupting the supply of fuel gas and an electromagnetic gas proportional valve 51 for adjusting the fuel gas supply amount are provided.

The hot water supply heat exchanger 4 includes a hot water supply sensible heat exchange section 4a for recovering the sensible heat of the combustion exhaust gas of the burner 2, and a combustion exhaust gas of the burner 2 more than the hot water supply sensible heat exchange section 4a. A hot water supply latent heat exchange unit 4b disposed downstream of the flow direction and recovering latent heat of the combustion exhaust gas from the burner 2 is provided. The fluid heat exchanger 7 includes a fluid sensible heat exchange section 7a as a fluid sensible heat exchange section for recovering the sensible heat of the combustion exhaust gas from the burner 2, and a fluid sensible heat exchange section 7
and a fluid latent heat exchange section 7b as a fluid latent heat exchange section disposed downstream of the burner 2 in the flow direction of the combustion exhaust gas of the burner 2 and recovering latent heat of the combustion exhaust gas of the burner 2. ing.

The hot water supply sensible heat exchange section 4a and the fluid sensible heat exchange section 7a are integrally formed so as to conduct heat to each other, and the hot water supply latent heat exchange section 4b and the fluid latent heat exchange section The heat exchange part 7b is integrally formed with the heat exchange part 7b in a state of conducting heat mutually. Further, the hot water supply heat exchanger 4 and the fluid heat exchanger 7 are arranged downstream of the burner 2 in the flow direction of the combustion exhaust gas from the burner.

In addition, the burner 2 is provided in the burner case 47 so that the flame formation direction is downward.
The combustion exhaust gas of the burner 2 is configured to flow downward. A sensible heat exchange unit K is provided below the burner 2 in which the hot water supply sensible heat exchange unit 4a and the fluid sensible heat exchange unit 7a are integrally formed in a state of conducting heat to each other. Below the sensible heat exchange section K, there is provided a latent heat exchange section N in which the hot water supply latent heat exchange section 4b and the fluid latent heat exchange section 7b are integrally formed in a state of conducting heat to each other.

That is, the hot water supply heat exchanger 4 is provided with a hot water supply sensible heat exchange section 4a and a hot water supply latent heat exchange section 4b, and the fluid heat exchanger 7 is replaced with the fluid sensible heat exchange section. A hot water supply sensible heat exchange part 4a and a fluid sensible heat exchange part 7a are integrally formed in a state of conducting heat to each other, and By forming the hot water supply latent heat exchange unit 4b and the fluid latent heat exchange unit 4b integrally in a state of conducting heat to each other, the heat exchange unit 4 for hot water supply can be made compact while achieving compactness.
In the fluid heat exchanger 7, in addition to the sensible heat of the flue gas, the latent heat of the flue gas is recovered, and the value obtained by dividing the performance (heating capacity) of the device by the amount of energy input to the device, ie, the so-called efficiency, is obtained. It is configured so that the efficiency is improved and the efficiency is improved.

Further, the heat exchange between the heat medium circulated by the heating pump 21 and the water heated by the hot water supply heat exchanger 4 and the hot water circulated by the hot water supply pump 103 A liquid-liquid heat exchanger 100 for exchanging heat with a heat medium heated by the fluid heat exchanger 7 is provided. In addition, as shown in FIGS. 1 and 5, the liquid-liquid heat exchanger 100 includes a hot water supply passage 101 that connects the hot water supply latent heat exchange unit 4b and the hot water supply sensible heat exchange unit 4a, The heating return path 5 connected to the inlet side of the fluid heat exchanger 7 is located inside the heating return path 5 and the hot water supply flow path 101 in some sections.
The outside is a double tube structure. Then, water heated by the hot water supply latent heat exchange section 4b and not heated by the hot water supply sensible heat exchange section 4a, and the heating pump 21 are operated to turn on the fluid heat exchanger 7 and the heating bypass passage. The heat exchange between the heat medium circulated in the fluid circulation circuit including the fluid circulation circuit 6a and the heat medium before being heated by the fluid latent heat exchange unit 7b and the hot water supply pump 103 are operated to supply hot water. 3 and heat exchange between hot water and water circulated through the water supply passage 1.

The liquid-liquid heat exchanger 100 is configured such that the flow direction of water in the hot water supply flow path 101 and the flow direction of the heat medium in the heating return path 5 are opposite to each other. Medium for hot water supply 1
01 heat exchange with water efficiently
It is configured to efficiently exchange heat from hot water in the hot water supply flow path 101 to the heat medium in the heating return path 5.

Further, condensed water, that is, drain, that falls from the hot water supply latent heat exchange unit 4b and the fluid latent heat exchange unit 7b is provided below the hot water supply latent heat exchange unit 4b and the fluid latent heat exchange unit 7b. A drain recovery path 55 for recovery is provided, and the drain recovered in the drain recovery path 55 is supplied to a neutralization device 56 to neutralize the drain and then discharge the same. As the neutralizing device 56, for example, various neutralizing devices such as a device that neutralizes with a metal having a high ionization tendency such as Mg or Zn are applicable.

The sensible heat exchange section K will be described in further detail. As shown in FIGS. 2, 3 and 6, a hot water supply heat transfer pipe 57 for passing water from the water supply passage 1 and a high-temperature type heating terminal D1 are provided. A heat transfer tube 58 for heating that allows a heat medium from such as to pass therethrough is provided so as to penetrate a plurality of heat transfer fins 59 for sensible heat in the longitudinal direction. Then, on both lateral sides of the sensible heat exchange section K, the hot water supply heat transfer pipe 57 and the heating heat transfer pipe 5
The U-shaped heat transfer tubes 60 are connected so that the U-shaped heat transfer tubes 8 are connected to each other, and the hot water supply heat transfer tubes 57 and the heating heat transfer tubes 58 pass through a plurality of sensible heat transfer fins 59. In this state, the pipe is arranged in a meandering shape. The heat transfer fins 59 for sensible heat are provided with through holes 61 for inserting the heat transfer tubes 57 and 58 for the hot water supply as shown in FIG. The heat transfer tube 57 and the heating heat transfer tube 58 are configured to fit inside the through holes 61 of the sensible heat transfer fins 59.

More specifically, the hot water supply heat transfer tube 57 and the heating heat transfer tube 58 are integrally formed so that the hot water supply heat transfer tube 57 and the heating heat transfer tube 58 are in heat conduction with each other. A sensible heat integral part 62,
There is provided a sensible heat singular portion 63 which is constituted only by the hot water supply heat transfer tube 57. The heat transfer fins 5 for sensible heat
9 is provided with a sensible heat integrated type through hole 64 for inserting the sensible heat integrated part 62 and a sensible heat single type through hole 65 for inserting the sensible heat single part 63. . In the upper part of the sensible heat transfer fins 59, five integrated sensible heat through-holes 64 are provided in a row in the horizontal direction. The four mold through-holes 65 are provided in a state of being arranged in the lateral direction.

The sensible heat exchange section K is a sensible heat integrated part 6.
2 is fitted in the sensible heat integrated through-hole 64, and the sensible heat singular portion 63 is fitted in the sensible heat single-type through hole 65.

As shown in FIGS. 2, 3 and 7, the latent heat exchange section N includes a hot water supply heat transfer tube 57 for passing water from the water supply passage 1, and a heat medium from a high temperature type heating terminal D1 or the like. Is provided so as to penetrate a plurality of latent heat transfer fins 66 in the longitudinal direction thereof. Then, on both lateral sides of the latent heat exchange section N, a U-shaped heat transfer tube 67 is connected so that the hot water supply heat transfer tube 57 and the heating heat transfer tube 58 are U-shaped. The heat transfer tube 57 and the heat transfer tube 58 for heating are arranged in a meandering manner so as to penetrate the plurality of heat transfer fins 66 for latent heat. In addition, the latent heat transfer fins 66 include:
As shown in (b) of FIG. 8, it is configured to include a through hole 68 through which the heat transfer pipe 57 for hot water supply and the heat transfer pipe 58 for heating are inserted, and the heat transfer pipe 57 for hot water supply and the heat transfer pipe 58 for heating are provided.
Are fitted inside the through holes 68 of the latent heat transfer fins 66 with the heat transfer cover P fitted outside.

More specifically, the hot water supply heat transfer tube 57 and the heating heat transfer tube 58 are integrally formed so that the hot water supply heat transfer tube 57 and the heating heat transfer tube 58 are in heat conduction with each other. An integrated portion 69 for latent heat,
A latent heat singular portion 70 composed of only the hot water supply heat transfer tube 57 is provided. And the heat transfer cover P
A latent heat integral heat transfer cover P1 externally fitted to the latent heat integrated portion 69 and a latent heat single type heat transfer cover P2 externally fitted to the latent heat single portion 70 are provided.

The latent heat transfer fin 66 is provided with an integrated latent heat through hole 7 for inserting the latent heat integrated portion 69 therethrough.
1 and a latent heat singular type through hole 72 through which the latent heat singular portion 70 is inserted. The latent heat transfer fins 66 are provided with four integrated latent heat through holes 71 arranged in the horizontal direction at the upper portion thereof. Are provided so as to be arranged side by side in the horizontal direction, and at the lower portion thereof, single-side latent heat-use holes 72 are provided so as to be arranged side by side in the horizontal direction.

The latent heat exchanging section N is an integral part for latent heat 6
9 is fitted inside the latent heat integral type through-hole 71 with the latent heat integral heat transfer cover P1 fitted externally, and the latent heat singular portion 70 is fitted externally to the latent heat single heat transfer cover P2. In this state, it is configured to be fitted inside the single-type latent heat through hole 72.

As shown in FIG. 4, the burner 2 includes a rich burner 2a for burning a rich air-fuel mixture having a small air mixing ratio and a light burner 2b for burning a lean air-fuel mixture having a high air mixing ratio. , Multiple burners 2a and light burners 2b
Are alternately juxtaposed with the width direction thereof being juxtaposed, and the box-shaped frame 2c provided in the burner case 47 is provided.
Is housed inside. Then, the lean air-fuel mixture of the light burner 2b is burned while maintaining the flame by the rich flame generated in the rich burner 2a, so that the fuel gas is burned at a large air mixing ratio as a whole, and the generation of NOx as nitrogen oxides is reduced. It is configured so that stable combustion can be performed while suppressing it as much as possible.

Further, this light-and-dark combustion burner is a thick burner 2
The latent heat of the combustion exhaust gas of the burner 2 is recovered by setting the air ratio of the entire lean burner as low as possible by, for example, increasing the amount of fuel gas supplied to the lean burner 2b as much as the amount of combustion gas supplied to the burner 2a. The configuration is such that the burner 2 is burned in an easy-to-operate state, and the latent heat of the combustion exhaust gas can be efficiently recovered in the latent heat exchange section N.

A kitchen remote controller 73 and a bathroom remote controller 74 for giving various instructions to the controller H are provided. The controller H is controlled by the kitchen remote controller 73 and the bathroom remote controller 74 as shown in FIG. , Burner operating part B,
The hot water supply operation unit X, the bath operation unit Y, and the heating operation unit Z are controlled to execute various operations such as a general hot water supply operation, an automatic bath operation, a hot operation, and a heating operation.

Incidentally, the burner operating section B is provided with the fan 4
8, a gas switching solenoid valve 50, a gas proportional valve 51, a source gas solenoid valve 52, an igniter 53, a frame rod 54, and the like. The hot water supply operation unit X includes a water supply thermistor 9, a water amount sensor 10, a hot water supply thermistor 12, and a mixing valve. 1
3. The mixing thermistor 14 and the like. The bath operation unit Y includes a bath pump 34, a water level sensor 39, a bath return thermistor 40, a bath two-way valve 41, a water flow switch 42, a bath going thermistor 43, a pouring solenoid valve 45, and the like. Is composed of a heating return thermistor 19, a heating pump 21, a heating high temperature thermistor 22, a heating low temperature thermistor 24, and the like.

The kitchen remote controller 73 has an operation switch 75 for instructing a general hot water supply operation executable state, a hot water supply temperature setting section 76 for setting a hot water supply temperature, a bath automatic switch 77 for instructing automatic bath operation, and a heating operation. A commanding heating switch 78 and the like are provided. The bathroom remote control 7
Reference numeral 4 denotes an operation switch 79 for instructing the general hot water supply operation to be executable, a bath setting change switch 80 for setting the filling temperature and water level of the bathtub A, a bath automatic switch 81 for instructing bath automatic operation, and A hot switch 82 for instructing operation is provided.

The operation of the controller H in various operations will be described. In the general hot water supply operation, when the amount of water detected by the water amount sensor 10 becomes equal to or more than a predetermined amount due to an opening operation of a hot water tap or the like, after driving the fan 48, the gas switching electromagnetic valve 50 is appropriately switched to switch the original gas electromagnetic valve 52. The valve is opened, the opening of the gas proportional valve 51 is adjusted, and the burner 2 is ignited by the igniter 53. And when the burner 2 is ignited,
The temperature set by the hot water supply temperature setting unit 76 of the kitchen remote controller 73, the detected water temperature by the water supply thermistor 9, and the water amount sensor 10
Gas switching solenoid valve 50 based on the amount of water detected by
Is switched, so-called feedforward control is performed so that the opening of the gas proportional valve 51 is adjusted, and the opening of the mixing valve 13 is also adjusted so that the hot water supply temperature reaches the set temperature. The hot water and the water from the bypass channel 11 are mixed by the hot water in the vessel 4, and hot water at a set temperature is supplied through the hot water channel 3.

In addition to the feedforward control, the opening degree of the gas proportional valve 51 is finely adjusted based on the difference between the set temperature by the hot water supply temperature setting unit 76 of the kitchen remote controller 73 and the detected hot water temperature by the mixing thermistor 14. The so-called feedback control is executed to supply hot water at the temperature set by the hot water temperature setting unit 76 of the kitchen remote controller 73 to the hot water tap. When the water amount sensor 10 stops detecting a predetermined amount of water flow with the closing operation of the hot water tap, the original gas solenoid valve 52 and the gas proportional valve 51 are closed to stop the combustion of the burner 2, and the combustion is stopped. After the lapse of time, the fan 48 is also stopped to end the general hot water supply operation.

When the bath automatic switch 77 of the kitchen remote controller 73 or the bath automatic switch 81 of the bathroom remote controller 74 is turned on, the pouring solenoid valve 45 is opened and the water level sensor 10 is turned on by a predetermined amount or more. Is detected, the burner 2 is ignited in the same manner as in the general hot water supply operation described above,
Hot water at a set temperature is supplied to the bathtub A by the feedforward control and the feedback control. That is, the opening degree of the gas proportional valve 51 and the mixing valve 13 is adjusted, the water from the water supply passage 1 is heated by the hot water supply heat exchanger 4, and the heated hot water is mixed with the water from the bypass passage 11. Then, hot water of the set temperature is supplied to the bath return path portion 32 and the bath going path portion 33 via the hot water path 18, and is supplied into the bathtub A from both the bath return path portion 32 and the bath going path portion 33. You.

When a predetermined amount of hot and cold water is supplied to the bathtub A, the bath pump 34 is operated to close the bath two-way valve 41 and the water level sensor 39 detects the water level in the bathtub A. When the set water level is reached, the pouring solenoid valve 45
Is closed, the original gas solenoid valve 52 and the gas proportional valve 51 are closed to stop the burner 2 from burning, and the fan 48 is also stopped after a certain period of time. In this way, the water level of the bathtub A is appropriately detected, and hot water is supplied to the bathtub A so that the water level of the bathtub A becomes the set water level. When hot water of the set water level is supplied to the bathtub A, the bath pump 34 is operated to perform a hot operation described later so that the temperature of the hot water of the bathtub becomes the set temperature. If the hot water tap is opened during the hot water filling operation, the interruption water amount sensor 16 detects the water flow, stops the bath automatic operation, and executes the general hot water supply operation. That is, the general hot water supply operation is executed with priority, and when the hot water tap is closed, the automatic bath operation is restarted.

When the hot switch 82 of the bathroom remote controller 74 is turned on, the bath pump 34 is turned on.
Operates, the bathtub hot water is circulated through the bath circulation path 36, the water flow switch 42 is turned on, and the bathtub hot water is supplied to the bath heating liquid / liquid heat exchanger 35. When the water flow switch 42 is turned on, the burner 2 is ignited.
The gas switching solenoid valve 50 is switched so that the combustion amount for operation becomes the operation combustion amount, and the gas proportional valve 51
Is adjusted. Further, the heating pump 21 is operated in accordance with the turning on of the water flow switch 42, and the hot water valve 3
The valve 8 is opened to supply the heat medium heated by the fluid heat exchanger 7 to the bath heating liquid / liquid heat exchanger 35.

As described above, in the bath-heating liquid-liquid heat exchanger 35, the bath tub water is heated by the heat medium heated by the fluid heat exchanger 7, and the detected temperature of the bath return thermistor 40 is set to the set temperature. When the temperature becomes slightly higher than that, the original gas solenoid valve 52 and the gas proportional valve 51 are closed to stop the burner 2 from burning, and the fan 48 is also stopped after a certain period of time. Then, the bath outgoing thermal valve 38 is closed, the heating pump 21 is stopped, and the bath two-way valve 41 is closed,
The bath pump 34 is stopped to end the hot operation. Even if the hot switch 82 is turned off, the above-described operation is performed, and the hot operation ends.

The heating operation includes a high-temperature heating operation for circulating a heat medium to the high-temperature heating terminal D1 and a low-temperature heating terminal D1.
2 is a low-temperature heating operation for circulating and supplying a heat medium. In the high-temperature heating operation, when there is an operation command from the heating remote controller or when the heating switch 78 of the kitchen remote controller 73 is turned on, the heating pump 21 is operated, the burner 2 is ignited, and the high-temperature heating terminal D1 is turned on. Burner 2 depending on load
Is controlled proportionally or ON / OFF controlled. That is, in the proportional control, the gas switching solenoid valve 50 is switched based on the detected temperature of the high-temperature thermistor 22 for heating and the opening degree of the gas proportional valve 51 is adjusted, so that the combustion amount of the burner 2 is reduced to the maximum combustion amount and the minimum combustion amount. The ON / OFF control is switched between a state in which the burner 2 burns with the minimum combustion amount and a state in which the burner 2 stops burning.

In the low-temperature heating operation, when there is an operation command from the heating remote controller, the heating pump 21 is operated, the burner 2 is ignited, and the low-temperature heating terminal D2 is operated in accordance with the load.
The combustion state of the burner 2 is proportionally controlled or ON / OFF controlled. That is, in the proportional control, the gas switching solenoid valve 50 is switched based on the detected temperature of the low-temperature thermistor 24 for heating and the opening degree of the gas proportional valve 51 is adjusted to reduce the combustion amount of the burner 2 to the maximum combustion amount and the minimum combustion amount. The ON / OFF control is switched between a state in which the burner 2 burns with the minimum combustion amount and a state in which the burner 2 stops burning.

It is also possible to perform various operations at the same time by controlling the combustion amount of the burner 2, such as a general hot water supply operation and a heating operation, and a general hot water supply operation and a bath automatic operation. For example, if there is a request for the heating operation during the general hot water supply operation, the general hot water supply operation and the heating operation are performed simultaneously by adding the combustion amount according to the load of the heating terminal D to the current combustion amount of the burner 2. It becomes possible. By the way, when performing multiple operations at the same time, based on various conditions,
Which operation condition is prioritized is set in advance, and each operation is performed based on the set priority condition.

The control section H supplies water to the hot water supply heat exchanger 4 by performing the general hot water supply operation and the automatic bath operation alone, and heats the heat medium to the fluid heat exchanger 7. In the hot water supply only heating state in which the supply from the terminal D is stopped, although not shown, a fluid boiling prevention thermistor for detecting the temperature of the heat medium in the fluid heat exchanger 7 is provided near the fluid heat exchanger 7. When the fluid boiling prevention condition is satisfied, such as when the temperature detected by the fluid boiling prevention thermistor becomes equal to or higher than the boiling set temperature, the heating pump 21
Is operated to circulate the heat medium in the fluid heat exchanger 7 in the fluid circulation circuit including the heating bypass path 6a while supplying the heat medium in the fluid heat exchanger 7 to the liquid-liquid heat exchanger 100 as shown by the dotted arrow in FIG. At the same time, the water from the water supply channel 1 is supplied to the hot water supply latent heat exchange unit 4b, the liquid heat exchange unit 100, and the hot water supply sensible heat exchange unit 4
They are configured to be supplied in the order of “a”.

In addition, the water from the water supply channel 1 is first supplied to the hot water supply latent heat exchange section 4b, and the water supplied to the hot water supply latent heat exchange section 4b and the combustion exhaust gas from the burner 2 are mixed. The temperature difference is made as large as possible so that the latent heat of the combustion exhaust gas is effectively recovered by the hot water supply latent heat exchange section 4b. Then, the water heated in the hot water supply latent heat exchange unit 4b is supplied to the liquid-liquid heat exchanger 100,
Heat is exchanged between the water and the heat medium in the heating return path 5 to suppress a rise in the temperature of the heat medium in the heat exchanger 7 for fluid, thereby preventing boiling of the heat medium in the heat exchanger 7 for fluid. Meanwhile, the water before being heated by the hot water supply sensible heat exchange unit 4a is preheated.

In this way, the latent heat of the combustion exhaust gas from the burner 2 is effectively recovered while preventing the heat medium in the fluid heat exchanger 7 from boiling, and the sensible heat exchange section 4 for hot water supply.
The value obtained by dividing the performance (heating capacity) of the device by the amount of energy input to the device while preheating the water before being heated at a, thereby preventing the heat medium in the fluid heat exchanger 7 from boiling. That is, the so-called efficiency is improved.

When the hot water supply is in the single heating state, the control unit H controls the heating pump 2 based on the combustion amount of the burner 2.
In order to adjust the amount of the heat medium circulated by 1, the operating state of the heating pump 21 is controlled. More specifically, the control unit H sets the heating pump 21 so that the larger the combustion amount of the burner 2 is, the larger the capacity of the heating pump 21 is.
The capacity of the heating pump 21 is controlled in three stages, large, medium and small, the amount of electric power supplied to the heating pump 21 is minimized, the running cost is reduced, and the noise accompanying the operation of the heating pump 21 is generated. It is configured to minimize as much as possible.

In the hot water supply single heating state, the temperature of the heat medium in the fluid heat exchanger 7 tends to rise faster when the combustion amount of the burner 2 is larger than when the combustion amount is smaller. The capacity of the heating pump 21 is set so that the capacity of the heating pump 21 increases as the amount increases.
By controlling in three stages, large, medium and small, the amount of heat medium to be circulated is changed according to the time until the heat medium in the heat exchanger for fluid 7 boils, and the heat for fluid is changed. Boiling of the heat medium in the exchanger 7 can be accurately prevented.

The control unit H supplies the heat medium to the fluid heat exchanger 7 by performing the heating operation and the hot operation independently, and supplies hot water from the hot water supply heat exchanger 4 to the hot water supply passage 3. Is stopped, the heating pump 21 is turned off.
1, the heat medium from the heating return path 5 is supplied to the liquid heat exchanger 100, the fluid latent heat exchange unit 7b, and the fluid sensible heat exchange unit 7a in the order shown by the dotted arrow in FIG. While supplying and heating, the fluid heat exchanger 7 and the heating bypass 6a
In addition to circulating in the fluid circulation circuit including, and operating the hot water supply pump 103, as shown by the solid arrow in FIG.
The hot water in the hot water supply heat exchanger 4 is circulated through the hot water supply path 3, the circulation bypass path 102, and the water supply path 1 while being supplied to the liquid heat exchanger 100.

In addition, the heat medium from the heating return path 5 is first supplied to the liquid-liquid heat exchanger 100, and heat is exchanged between the heat medium and the hot water in the hot water supply flow path 101. While suppressing the temperature rise of the hot water in the hot water supply heat exchanger 4 and preventing the hot water in the hot water supply heat exchanger 4 from boiling, the heat medium before being heated by the fluid latent heat exchanger 7b is removed. It is configured to preheat. Then, the heat medium heated by the fluid latent heat exchange unit 7b is heated by the fluid sensible heat exchange unit 7a to recover the sensible heat and latent heat of the combustion exhaust gas.

In this way, the sensible heat and the latent heat of the combustion exhaust gas of the burner 2 are recovered while the boiling water in the hot water supply heat exchanger 4 is prevented from boiling, and the fluid latent heat exchanger 7 for the fluid is supplied.
By preheating the heating medium before being heated in b,
Efficiency is improved while preventing boiling water in the heat exchanger 4 for hot water supply.

Then, in the fluid independent heating state, the control unit H controls the hot water supply pump 1 based on the combustion amount of the burner 2.
The operating state of the hot water supply pump 103 is controlled so as to adjust the amount of hot and cold water circulated by the hot water supply pump 03.
More specifically, the control unit H controls the capacity of the hot water supply pump 103 in three stages of large, medium, and small so that the capacity of the hot water supply pump 103 increases as the combustion amount of the burner 2 increases. The power supply amount to the hot water supply pump 103 is suppressed as much as possible to reduce the running cost, and noise generation due to the operation of the hot water supply pump 103 is suppressed as much as possible.

In the fluid independent heating state, the temperature of the hot water in the hot water supply heat exchanger 4 tends to rise faster when the combustion amount of the burner 2 is larger than when it is smaller.
The capacity of the hot water supply pump 103 is set so that the capacity of the hot water supply pump 103 increases as the combustion amount of the burner 2 increases.
By controlling in three stages, large, medium, and small, the amount of hot and cold water to be circulated is changed in accordance with the time until the hot and cold water in the hot water supply heat exchanger 4 boils. It is also possible to accurately prevent the boiling of the hot water in 4.

In order to prevent the boiling water in the hot water supply heat exchanger 4 and the heat medium in the fluid heat exchanger 7 from being boiled, basically, the sensible heat exchange section K and the latent heat heat exchange section N By making a part of the heat transfer pipe 57 for hot water supply and a part of the heat transfer pipe 58 for heating contact and integrally formed, the hot water in the heat exchanger 4 for hot water and the heat medium in the heat exchanger 7 for fluid are formed. Between the heat exchanger 4 for hot water supply and the heat exchanger 7 for fluid, on the side where the supply of the fluid (water or heat medium) is stopped, to suppress the temperature rise, It is configured to prevent the fluid (hot water or heat medium) from boiling.

[Second Embodiment] The second embodiment shows another embodiment of the arrangement of the liquid-liquid heat exchanger 100 in the first embodiment. Will be described with reference to the drawings. Incidentally, since the configuration other than the liquid-liquid heat exchanger 100 is the same as that of the above-described first embodiment, detailed description thereof will be omitted by giving the same reference numerals and the like.

In the first embodiment, the liquid-liquid heat exchanger 10
0 is a hot water supply latent heat exchange section 4b and a hot water supply sensible heat exchange section 4
a, and the heat exchanger 7 for the fluid.
The heating return path 5 connected to the inlet side of the heating pipe is configured in a double pipe structure with the heating return path 5 inside and the hot water supply flow path 101 outside in some sections. In the second embodiment, as shown in FIGS. 10 and 11, the liquid-liquid heat exchanger 100 is used for heating which connects the water supply channel 1 with the fluid latent heat heat exchange unit 7 b and the fluid sensible heat exchange unit 4 a. Channel 105
And, in some sections, inside the heating flow path 105,
It has a double pipe structure with the water supply channel 1 outside.

To add an explanation, the liquid-liquid heat exchanger 100
The heat exchange between the hot water in the water supply channel 1 and the heat medium heated by the fluid latent heat exchange unit 7b and not heated by the fluid sensible heat exchange unit 7a is performed. And
The liquid-liquid heat exchanger 100 is configured such that the flow direction of hot water in the water supply channel 1 and the flow direction of the heat medium in the heating flow path 105 are opposite to each other. It is configured to efficiently exchange heat with water in the water supply channel 1 and efficiently exchange heat from hot water in the water supply channel 1 with the heat medium in the heating flow path 105.

In the hot-water supply only heating state, the control section H is located near the fluid heat exchanger 7 (not shown).
A fluid boiling prevention thermistor for detecting the temperature of the heat medium in the fluid heat exchanger 7 is provided, and the temperature detected by the fluid boiling prevention thermistor is equal to or higher than the boiling set temperature, thereby preventing the fluid boiling. When the condition is satisfied, the heating pump 21 is operated, and as shown by the dotted arrow in FIG.
While supplying the heat medium in the fluid heat exchanger 7 to the liquid-liquid heat exchanger 100, the heat medium is circulated in the fluid circulation circuit including the heating bypass path 6a, and water from the water supply path 1 is subjected to liquid-liquid heat exchange. The unit 100, the hot water supply latent heat exchange unit 4b, and the hot water supply sensible heat exchange unit 4a are supplied in this order.

More specifically, the water from the water supply channel 1 is first supplied to the liquid-liquid heat exchanger 100 to cause heat exchange between the water and the heat medium in the heating flow path 105, and Preheating the water before being heated by the hot water supply latent heat exchange unit 4b while suppressing the temperature rise of the heat medium in the heat exchanger 7 and preventing the heat medium in the fluid heat exchanger 7 from boiling. It is configured to be. The water heated in the hot water supply latent heat exchange section 4b is heated in the hot water supply sensible heat exchange section 4a to recover the sensible heat and latent heat of the combustion exhaust gas.

Thus, while preventing the heat medium in the fluid heat exchanger 7 from boiling, the sensible heat and latent heat of the combustion exhaust gas from the burner 2 are recovered, and the hot water supply latent heat exchange section 4 is provided.
By preheating the water before being heated in b, the efficiency of the water is improved while preventing the boiling of the water in the heat exchanger 7 for fluid.

Further, in the fluid independent heating state, the control unit H operates the heating pump 21 to transfer the heat medium from the heating return path 5 to the fluid latent heat exchange as shown by the dotted arrow in FIG. While supplying and heating in the order of the unit 7b, the liquid-liquid heat exchanger 100, and the sensible heat exchange unit for fluid 7a, the fluid is circulated in the fluid circulation circuit including the heat exchanger for fluid 7 and the heating bypass 6a. By operating the pump 103, FIG.
As shown by a solid line arrow in FIG. 0, the hot water in the hot water supply heat exchange 4 is circulated through the hot water supply path 3, the circulation bypass path 102, and the water supply path 1 while being supplied to the liquid heat exchanger 100. ing.

More specifically, the heat medium from the heating return path 5 is first supplied to the fluid latent heat exchange section 7b, and the heat medium supplied to the fluid latent heat exchange section 7b and the combustion of the burner 2 are performed. The configuration is such that the temperature difference from the exhaust gas is made as large as possible and the latent heat of the combustion exhaust gas is effectively recovered by the fluid latent heat exchange section 7b. Then, the heat medium heated in the latent heat exchange unit for fluid 7b is transferred to the liquid-liquid heat exchanger 10.
0, the heat exchange between the heat medium and the hot and cold water in the water supply channel 1 suppresses the temperature rise of the hot and cold water in the hot water supply heat exchanger 4, and the hot and cold water in the hot water supply heat exchanger 4 It is configured to preheat the heat medium before being heated by the fluid sensible heat exchange unit 7a while preventing boiling.

In this way, the latent heat of the combustion exhaust gas from the burner 2 is effectively recovered while preventing the boiling water in the hot water supply heat exchanger 4 from boiling, and the fluid sensible heat exchange section 7a
By preheating the heat medium before it is heated by the heater, the boiling water in the hot water supply heat exchanger 4 is prevented from boiling and the efficiency is improved.

Then, in the second embodiment, the first
In the same manner as in the embodiment, in the hot water supply single heating state, the larger the combustion amount of the burner 2, the larger the heating pump 2
1, the capacity of the heating pump 21 is controlled in three stages of large, medium, and small, and in the fluid-only heating state, the larger the combustion amount of the burner 2, the larger the capacity of the hot water supply pump 103. Hot water pump 1
03 may be configured to be controlled in three stages, large, medium, and small. Alternatively, instead of this configuration, the operating state of the heating pump 21 or the hot water supply pump 103 may be controlled. Good.

That is, according to the amount of combustion of the burner 2, the control may be performed steplessly so that the larger the amount of combustion of the burner 2, the greater the capacity of the heating pump 21 or the hot water supply pump 103. Further, the present invention is not limited to adjusting the capacity of the heating pump 21 or the hot water supply pump 103 based on the combustion amount of the burner 2. In the hot water supply single heating state, based on the temperature of the heat medium in the fluid heat exchanger 7. It is also possible to adjust the capacity of the heating pump 21 and adjust the capacity of the hot water supply pump 103 based on the temperature of the hot water in the hot water supply heat exchanger 4 in the fluid independent heating state.

[Other Embodiments] (1) In the first and second embodiments, the temperature detected by the fluid boiling prevention thermistor provided near the fluid heat exchanger 7 in the hot water supply only heating state is boiling. The heating pump 21 is configured to operate when the fluid boiling prevention condition is satisfied, for example, when the temperature becomes equal to or higher than the set temperature, but when the hot water supply is in the single heating state, it is determined whether the fluid boiling prevention condition is satisfied. Regardless, always, heating pump 2
1 and circulates the heat medium while supplying the heat medium to the liquid-liquid heat exchanger 100, and circulates the water from the water supply channel 1 with the hot water supply latent heat exchange section 4b, the liquid heat exchange section 100, and the hot water supply sensible heat. It is also possible to carry out the configuration by supplying the heat in the order of the heat exchange unit 4a. In addition, the conditions for preventing boiling for fluid include, for example, elapse of a set time from the start of combustion of the burner 2.
Various conditions are applicable and can be changed as appropriate.

(2) In the first and second embodiments,
In the fluid independent heating state, the hot water supply pump 103 is always operated. For example, in the vicinity of the hot water supply heat exchanger 4, a hot water supply temperature in the hot water supply heat exchanger 4 is detected. A configuration is provided in which a boiling prevention thermistor is provided, and when the hot water boiling prevention condition is satisfied, such as when the temperature detected by the hot water supply boiling prevention thermistor becomes equal to or higher than the set temperature for boiling, the hot water supply pump 103 is operated. It is also possible to carry out. In this case, various conditions can be applied to the boiling prevention condition for hot water supply, such as elapse of a set time from the start of combustion of the burner 2, and the condition can be appropriately changed.

(3) In the first and second embodiments,
The hot water supply heat exchanger 4 includes a hot water supply sensible heat exchange section 4a and a hot water supply latent heat exchange section 4b.
Is configured to include a sensible heat exchange unit for fluid 7a and a latent heat exchange unit for fluid 7b, and the sensible heat of the combustion exhaust gas of the burner 2 is supplied to both the hot water supply heat exchanger 4 and the fluid heat exchanger 7. Although it is configured to recover latent heat, both the hot water supply heat exchanger 4 and the fluid heat exchanger 7 may be configured to recover only the sensible heat of the combustion exhaust gas of the burner 2. It is possible.

(4) In the first and second embodiments,
The hot water supply sensible heat exchange section and the fluid sensible heat exchange section are integrally formed in a state of conducting heat to each other, and
The hot water supply latent heat exchange section and the fluid latent heat exchange section are integrally formed so as to conduct heat to each other, but the hot water supply sensible heat exchange section 4a and the fluid sensible heat exchange section 7
a, and either or both of the hot water supply latent heat exchange unit 4b and the fluid latent heat exchange unit 7b may be formed separately.

(5) In the first and second embodiments,
Although the flame formation direction of the burner 2 is configured to be downward, it is also possible to configure so that the flame formation direction of the burner 2 is configured to be upward. In this case, the sensible heat exchange section K is located on the lower side, and the latent heat exchange section N is located on the upper side, so that the distribution of the sensible heat exchange section K and the latent heat exchange section N is performed. The installation position is configured to be turned upside down.

(6) In the first and second embodiments,
A bypass path 11 for supplying water supplied through the water supply path 1 to the hot water supply path 3 bypassing the hot water supply heat exchanger 4 is provided;
Hot water and hot water heated by hot water supply heat exchanger 4 and bypass 11
And hot water is supplied through the hot water supply path 3, but without the bypass path 11, the entire amount of water supplied through the water supply path 1 is supplied to the hot water supply heat exchanger 4. It is also possible to carry out by configuring so as to supply the data.

(7) In the first and second embodiments,
The fluid heat exchanger 7 is configured to heat one fluid as the fluid to be heated. For example, the fluid heat exchanger 7 may use a heat medium supplied to the heating terminal D and a bathtub hot water. It is also possible to configure and carry out heating so that the fluid heat exchanger 7 heats a plurality of fluids.

(8) In the first and second embodiments,
By providing a bath-heating liquid-to-liquid heat exchanger 35 in addition to the hot water supply heat exchanger 4 and the fluid heat exchanger 7, in addition to the hot water supply and the supply of the heat medium to the heating terminal D, the bathtub hot water It is configured to perform the heating, or configured to perform only the supply of the heat medium to the hot water supply and the heating terminal D,
Alternatively, it is also possible to configure and carry out only the hot water supply and the additional heating of the bath water.

In addition, in the case where only the heating medium is supplied to the hot water supply and the heating terminal, in the first and second embodiments, the bath circulation path 36 and the liquid heat exchange for bath heating are used. The container 35 and the like are not provided. Further, in the case where only the hot water supply and the reheating of the bath water are performed, the heat medium fluid heat exchanger 7 is connected to the bath return path portion 32 in the bath circulation path 36 as an entrance from the bath tub A.
Is supplied to the bath tub A and supplied to the bath tub A through the bath path section 33 in the bath circulation path 36 as an outlet, and the heating target fluid in the fluid heat exchanger 7 is heated by the heating terminal D. Instead of the heat medium supplied to the tub.

(9) In the first and second embodiments,
By forming the heat transfer pipe 57 in the heat exchanger 4 for hot water and the heat transfer pipe 58 for the fluid in the heat exchanger 7 of the fluid in contact with each other, the heat exchanger 4 and the heat exchange for the fluid are integrally formed. The heater 7 and the heat transfer pipe 57 are integrally formed in a state where they are thermally conductive to each other. For example, a part of the outer peripheral part of the heat transfer pipe 57 and a part of the inner peripheral part of the fluid heat transfer pipe 58 are formed. In a state where the hot water supply heat transfer tube 57 is on the inside and the fluid heat transfer tube 58 is on the outside, the hot water supply heat exchanger 4 and the fluid heat exchanger 7 are mutually connected. It is also possible to carry out the configuration by integrally forming the heat exchanger in a state of conducting heat, and the structure for conducting heat conduction between the hot water supply heat exchanger 4 and the fluid heat exchanger 7 can be appropriately changed. It is possible.

(10) In the first embodiment, the liquid-liquid heat exchanger 100 has the heating return path 5 inside, the hot water supply path 101
, But instead of the heating return path 5, a high-temperature heating outgoing path 6 is used, with the high-temperature heating outgoing path 6 inside and the hot-water supply flow path 101 outside. It is possible to configure a double pipe structure. Also in the second embodiment, the liquid-liquid heat exchanger 100 has a double pipe structure in which the heating flow path 105 is inside and the water supply path 1 is outside. Thus, it is also possible to use the hot water supply path 3 and have a double pipe structure in which the heating flow path 105 is inside and the hot water supply path 3 is outside. Incidentally, in the double pipe structure, for example, the hot water supply flow path 1
The arrangement of the inside and the outside can be changed as appropriate, such as 01 inside and the heating return path 5 outside. The configuration of the liquid-liquid heat exchanger 100 is not limited to the double-pipe structure, and the inner pipe is provided with two pipes in order to prevent fluid from leaking from the inner pipe and mixing the heat medium and water. It is also possible to form a triple pipe structure by providing a pipe outside the double pipe.

(11) In the above embodiment, an example is shown in which the hot water supply apparatus according to the present invention is applied to a hot water supply apparatus for performing hot water supply, additional heating of bath water, and supply of a heat medium to the heating terminal D. And various other hot water supply devices.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a hot water supply device according to a first embodiment.

FIG. 2 is a front view of the water heater.

FIG. 3 is a perspective view showing a burner, a sensible heat exchange unit, and a latent heat exchange unit.

FIG. 4 is a perspective view showing a burner.

FIG. 5 is a diagram showing a liquid-liquid heat exchanger according to the first embodiment.

FIG. 6 is a side view of a sensible heat exchange unit.

FIG. 7 is a side view of the latent heat exchange unit.

FIG. 8 is a diagram showing main parts of a sensible heat exchange unit and a latent heat exchange unit.

FIG. 9 is a control block diagram of a water heater.

FIG. 10 is a schematic configuration diagram of a hot water supply device according to a second embodiment.

FIG. 11 is a diagram showing a liquid-liquid heat exchanger according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water supply path 2 Burner 3 Hot water supply path 4 Hot water supply heat exchanger 4a Hot water supply sensible heat exchange part 4b Hot water supply latent heat exchange part 5 Inlet 6 Outlet 7 Fluid heat exchanger 7a Fluid sensible heat exchange part 7b Fluid Latent heat exchanging unit 11 Bypass path 21 Fluid circulating means 32 Bath return path 33 Bath going path 34 Bath circulating means 35 Bath heating liquid heat exchanger 100 Liquid heat exchanger 103 Hot water circulating means A Bath tub D Heat consumption Terminal

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuji Morita 4-1-2, Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture Inside Osaka Gas Co., Ltd. (72) Shinobu Ishihara 1-1-1, Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka No. 52 Harman Co., Ltd. (72) Katsuhiko Yamada 1-152 Oka, Minami-ku, Osaka-shi, Osaka F-term (reference) 3L024 CC11 CC16 CC19 CC30 DD06 DD22 DD27 DD31 DD46 GG06 GG07 GG11 GG21 GG24 HH14 HH26 HH35 3L036 AA04 3L070 AA01 BB02 BB18 BC02 BC21 CC02 DD01 DD08 DG02 DG04 3L103 AA06 BB41 CC02 DD06 DD36 DD68

Claims (6)

[Claims] 1. A hot water supply heat exchanger for heating water supplied through a water supply passage by burning a burner to supply hot water to a hot water supply passage, and heating a fluid to be heated supplied through an inlet passage by burning the burner. A heat exchanger for fluid flowing out of the outlet is provided, wherein the heat exchanger for hot water supply and the heat exchanger for fluid are integrally formed in a state of conducting heat to each other, Fluid circulation means for circulating the fluid to be heated between the fluid heat exchanger and the heat consuming terminal is provided, and hot water circulation for circulating hot water in the hot water heat exchanger through the hot water supply path and the water supply path. Means are provided, and heat is exchanged between the fluid to be heated circulated by the fluid circulation means and the water heated by the hot water supply heat exchanger, and the hot water circulation means is provided. The hot water circulated When, water heater liquid-liquid heat exchanger for exchanging heat is disposed between the heating object fluid to be heated by the fluid heat exchanger. 2. The hot water supply heat exchanger for recovering sensible heat of the combustion exhaust gas of the burner, and the flow of the combustion exhaust gas of the burner more than the hot water supply sensible heat exchange unit. And a hot water supply latent heat exchange unit that is disposed downstream in the direction and recovers latent heat of the combustion exhaust gas of the burner.The heat exchanger for fluid recovers sensible heat of the combustion exhaust gas of the burner. A sensible heat exchange unit for fluid, and a latent heat heat for fluid disposed downstream of the sensible heat exchange unit for fluid in the direction of flow of the flue gas of the burner to collect latent heat of the flue gas of the burner. An exchange unit is provided.
A hot water supply device according to item 1. 3. The sensible heat exchange unit for hot water supply and the sensible heat exchange unit for fluid are integrally formed so as to conduct heat to each other, and the hot water supply latent heat exchange unit and the fluid The hot water supply apparatus according to claim 2, wherein the latent heat exchange unit and the latent heat exchange unit are integrally formed in a state of conducting heat to each other. 4. The fluid heat exchanger is configured to be supplied from the heat consuming terminal through the inlet as the fluid to be heated and to heat a heat medium supplied to the heat consuming terminal through the outlet. Bath circulating means for circulating hot and cold water in the bath tub through a bath return path and a bath outgoing path; and the heat medium heated by the fluid heat exchanger and the hot tub water circulated by the bath circulating means. The hot water supply apparatus according to any one of claims 1 to 3, further comprising a bath-heating liquid-liquid heat exchanger that exchanges heat with water. 5. A bypass which supplies water supplied through the water supply channel to the hot water supply channel bypassing the hot water supply heat exchanger, wherein the hot water and the hot water heated by the hot water supply heat exchanger are provided. The hot water is supplied through the hot water supply path by mixing with water from a bypass path.
The hot water supply device according to the item. 6. A control means for controlling combustion of the burner is provided, wherein the control means supplies the water to the hot water supply heat exchanger and supplies the water to the fluid heat exchanger. In the hot water supply single heating state in which the supply of the fluid from the heat consuming terminal is stopped, the amount of the fluid to be heated circulated by the fluid circulating means is adjusted based on the combustion amount of the burner. Controlling the operating state of the fluid circulation means, and supplying the fluid to be heated to the fluid heat exchanger, and stopping the hot water supply from the hot water supply heat exchanger to the hot water supply path. In the fluid-only heating state, the operation state of the hot-water supply circulating means is controlled so as to adjust the amount of the hot water circulated by the hot-water supply circulating means based on the combustion amount of the burner. Claims that have been made 5
The hot water supply device according to any one of the above.