JP3026761B2 - Water heater - Google Patents

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 from a water supply passage and supplying the same to a hot water supply passage, and heating the hot water in a return passage from the heat consuming device to the heat consuming device. A heat exchanger for a heat consuming device to be supplied to an outgoing path, one burner for heating the heat exchanger for hot water supply and a heat exchanger for a heat consuming device, and an atmosphere provided on a return path from the heat consuming device. An open-type tank, a circulation pump for circulating hot and cold water provided in a return path between the open-to-air tank and the heat exchanger for the heat consuming device, and control means for controlling the operation of the circulation pump. Water heater.

[0002]

2. Description of the Related Art As the above-mentioned heat consuming device, various devices such as a heating device and a dryer are conceivable. For example, taking a heating device as an example, a conventional device for heating hot water for the heating device is conventionally used. In general, the heat exchanger for heating and the heat exchanger for hot water supply are configured to be heated by separate burners.
However, such a configuration requires a total of two burners, a dedicated burner for heating the heat exchanger for heating and a dedicated burner for heating the heat exchanger for hot water supply, and each burner requires Each of them requires additional parts such as a safety valve, and has a drawback that the whole apparatus is inevitably large.

[0003]

In order to solve the above-mentioned drawbacks, the heating heat exchanger and the hot water supply heat exchanger may be heated by one burner. However, even when only one of the heat exchangers is to be heated, the other heat exchangers are also heated together. For example, when using hot water supply by heating the hot water supply heat exchanger, the heating heat exchanger is also heated at the same time, and the hot water staying in the heating heat exchanger becomes high temperature. When the heating device is operated in such a state, high-temperature hot water that has accumulated in the heating heat exchanger at the start of operation is supplied to the heating device side, and various types of heating device and its piping system are provided. Another problem arises in that valves are adversely affected.

[0004] The present invention focuses on such a problem, and an object of the present invention is to provide a heat exchanger for heating water and a heat exchanger for heating water for a heat consuming device such as a heating device. When the heat consuming device is started to operate, it is ensured that hot water is not supplied to the heat consuming device, while making the entire device compact and simplifying the structure. It is to provide a hot water supply device that can be used.

[0005]

According to the first aspect of the present invention, a heat exchanger for hot water supply and a heat exchanger for a heat consuming device are heated by a single burner. In addition to making the entire device compact and simple, the outgoing route of the heat consuming device and the return route upstream of the open-to-air tank are connected by a bypass route bypassing the heat consuming device, and Intermittent means for intermittently supplying hot water from the heat consuming device to the heat consuming device, and at the start of operation of the heat consuming device, control means controls the intermittent means to control the hot water from the heat consuming device heat exchanger. Is supplied to the return path via the bypass path, even when the hot water stays in the heat exchanger for the heat consuming apparatus when the operation of the heat consuming apparatus is started. The hot water is supplied by the circulation pump. Is returned to the atmosphere open tank through the scan path and the return path, so that the temperature decreases is mixed with hot water in the tank. Therefore, the high-temperature hot water in the heat exchanger for the heat consuming device is not directly supplied to the heat consuming device side, and is supplied to various devices and appliances such as valves provided in the heat consuming device and its piping system. Adverse effects are reliably avoided.

According to the second aspect of the present invention, the control means controls the intermittent means after a lapse of a predetermined time from the start of operation of the heat consuming device to heat the hot water from the heat exchanger for the heat consuming device. Since it is configured to supply the hot water to the heat consuming device, the predetermined time is appropriately set so that the supply of high-temperature hot water to the heat consuming device is reliably avoided, and the heating is automatically performed to the heat consuming device. The operation of the heat consuming device can be performed by supplying the hot water later.

According to the third aspect of the present invention, there is provided a temperature detecting means for detecting the temperature of hot water from the heat exchanger for a heat consuming device, and based on the temperature detected by the temperature detecting means,
Since the control means is configured to supply the hot water from the heat consuming device heat exchanger to the heat consuming device by controlling the intermittent means, a special temperature detecting means is required. The operation of the heat consuming device can be executed quickly.

According to the fourth aspect of the present invention, a hot water supply bypass path and a hot water supply auxiliary bypass path connecting the water supply path and the hot water supply path in a state of bypassing the hot water supply heat exchanger are provided. Mixing means for mixing the water from the hot water supply bypass with the hot water from the hot water supply heat exchanger, and a bypass valve for interrupting the flow of water through the auxiliary hot water supply bypass path. Since the mixing means and the bypass valve are controlled to supply water to the hot water supply path via the hot water supply bypass path and the hot water supply auxiliary bypass path, even if the hot water Even if hot water is retained, the temperature is reduced by being diluted with water from the bypass passage and the auxiliary bypass passage, so that hot water is not unexpectedly supplied at the start of hot water supply. Moreover, even if the mixing means is,
Even if the hot water supply heat exchanger is broken in the open state, water is supplied from the auxiliary bypass path to the hot water supply path, so that unexpected supply of hot water at the start of hot water supply is avoided.

According to a fifth aspect of the present invention, there is provided a hot water supply temperature detecting means for detecting a temperature of hot water from the hot water supply heat exchanger, and the control is performed based on the temperature detected by the hot water supply temperature detecting means. Since the means is configured to close the bypass valve, it is possible to maintain the hot water supply temperature at a desired temperature by adjusting the mixing ratio by the mixing means after the bypass valve is closed. And also
As described above, even when the mixing unit fails in the open state, hot water having a temperature higher than a preset set temperature is not supplied, and the mixing device can be used safely.

According to the invention described in claim 6, the heat consuming device is a heating device, and the heat consuming device heat exchanger is a heating heat exchanger for heating hot water for a heating device. Since the heat transfer tube of the heat exchanger for heating and the heat transfer tube of the heat exchanger for hot water supply share the same heat transfer plate, the structure can be simplified by sharing the heat transfer plate, In addition, the position of the heat transfer tube of the heating heat exchanger and the heat transfer tube of the hot water supply heat exchanger can be easily set by the interposition of the heat transfer plate.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a water heater according to the present invention will be described with reference to the drawings. As shown in FIG. 1, this hot water supply apparatus includes a hot water supply heat exchanger 1 and a heating heat exchanger 2, and a heat transfer tube 3 and a heating heat exchanger 2 of the hot water supply heat exchanger 1.
Are connected to each other by a plurality of common heat transfer plates 5, and the heat transfer tubes 3 and 4 share the same heat transfer plate 5. The heat exchanger 1 for hot water supply and the heat exchanger 2 for heating are:
A fan 7 that is configured to be heated by one gas-fired burner 6 and that supplies combustion air to the burner 6 is also provided.

The heat transfer pipe 3 of the hot water supply heat exchanger 1 is connected to an ordinary household water pipe to supply water for heating, and the heated hot water is supplied to a bathtub or hot water supply (not shown). A hot water supply path 9 for supplying water to the tap is connected, and a water supply path 8 is provided with a water amount sensor 10 for detecting a water flow rate and a water supply thermistor 11 for detecting a temperature of water supplied to the heat exchanger 1 for hot water supply. Is provided with a tapping thermistor 12 as a hot water supply temperature detecting means for detecting the temperature of the hot water after heating.

The water supply passage 8 and the hot water supply passage 9 are connected to each other by two bypass passages, that is, a hot water supply bypass passage 13 and a hot water supply auxiliary bypass passage 14 for mixing bypassing the hot water supply heat exchanger 1. At the connection point between the hot water supply bypass 13 and the hot water supply passage 9, the mixing ratio of the amount of hot water from the hot water supply heat exchanger 1 and the amount of water from the bypass 13 is adjusted so that the desired temperature A mixing valve 15 is provided as mixing means for obtaining hot water. The auxiliary bypass passage 14 for hot water supply has an electromagnetic bypass valve 16 for interrupting the flow of water.
And a hot water supply thermistor 17 for detecting the temperature of the hot water mixed by the mixing valve 15 is connected to the hot water supply passage 9 downstream of the mixing valve 15. A water proportional valve 18 for adjusting the flow rate is provided.

The heat transfer tube 4 of the heating heat exchanger 2 is connected to a return path 20 from a heating device 19 as a heat consuming device and an outgoing path 21 to the heating device 19.
An expansion tank 2 as an open-to-air tank is located in the middle of
2 is provided, and a circulation pump 23 for circulating hot and cold water is provided on a return path 20 between the expansion tank 22 and the heat exchanger 2 for heating, and sucks hot water in the expansion tank 22. The heating water is supplied to the heating heat exchanger 2, the heated hot water is supplied to the heating device 19, and the hot water that has been heat-exchanged by the heat exchanger of the heating device 19 is supplied to the expansion tank 22.
It is configured to return to within.

A heating thermistor 24 as a temperature detecting means for detecting the temperature of the hot water heated by the heating heat exchanger 2 is provided on the outgoing path 21 to the heating device 19, and is provided downstream from the heating thermistor 24. The side path 21 and the return path 20 upstream of the expansion tank 22 are connected to each other by a bypass path 25 that bypasses the heating device 19, and the path 21 downstream of the connection point of the bypass path 25 includes:
An electromagnetic on-off valve 26 is provided as an on-off means for intermittently supplying hot water to the heating device 19. By closing this on-off valve 26, the hot water from the heating heat exchanger 2 is connected to the bypass passage 25. It is configured to return to the inside of the expansion tank 22 via the return path 20.

The burner 6 is configured to be supplied with fuel gas for general household use, and is provided with a safety valve 27 for intermittently supplying fuel gas and an electromagnetic gas proportional valve 28 with an original gas supply passage 29. Are connected to two gas supply paths 30 and 31, and the gas supply paths 30 and 31 are provided with gas switching solenoid valves 32 and 33, respectively. That is, the burner 6 is provided with two combustion blocks, one of which is connected to the gas supply path 30 and the other of which is connected to the other gas supply path 31. As shown in FIG. It is configured to be switchable between a state of combustion capacity 1 for burning and a state of combustion capacity 2 for burning both combustion blocks. 2, the horizontal axis indicates the input amount of the burner 6, and the vertical axis indicates the rotation speed of the fan 7.

The operation of the hot water supply apparatus is controlled by a control section H, which is a control means mainly composed of a microcomputer. The control section H includes an operation switch 34 and a temperature for setting a hot water supply temperature during hot water supply operation. A remote controller R having a setting switch 35 and the like is connected. When the operation switch 34 of the remote controller R is turned on, it becomes operable, and a hot water supply operation is executed by opening a hot water tap (not shown).
The heating operation is executed by turning on the heating operation switch 36 of the heating device 19.

During the hot water supply standby state prior to the hot water supply operation, the water proportional valve 18 of the hot water supply passage 9 is maintained in the open state, and the electromagnetic valve of the auxiliary bypass passage 14 is provided as shown in the flowchart of FIG. 16 is maintained in an open state, and the opening of the mixing valve 15 is set to a preset opening, specifically, the mixing ratio represented by the amount of hot water / (the amount of hot water + the amount of water) becomes about 0.5. Will be maintained. Therefore, even if a hot water tap (not shown) is opened in a state where hot water is present in the heat transfer tube 3 of the heat exchanger 1 for hot water supply, the bypass path 1
Water is supplied to the hot water supply passage 9 via the hot water supply passage 3 and the auxiliary bypass passage 14, so that hot water is not discharged from the hot water tap. Then, when the water amount sensor 10 detects that a predetermined amount or more of water has flowed through the water supply passage 8 and the temperature detected by the tapping thermistor 12 becomes a preset temperature, for example, 60 degrees Celsius or less, the auxiliary bypass is provided. The hot water supply operation is executed while closing the solenoid valve 16 of the passage 14 and adjusting the opening of the mixing valve 15.

During the heating operation standby, as shown in the flowchart of FIG. 4, the on-off valve 26 provided on the outgoing path 21 to the heating device 19 is maintained in a closed state, and the heating device 19 is closed.
Is turned on, the circulation pump 23 is driven. Therefore, the heat transfer tubes 4 of the heating heat exchanger 2
Even if high-temperature hot water exists, the high-temperature hot water is returned into the expansion tank 22 via the bypass passage 25 and the return passage 20, and is not directly supplied to the heating device 19. Then, after a lapse of a predetermined time, or after the heating thermistor 24
When the temperature detected by the system becomes equal to or lower than a predetermined temperature,
The on-off valve 26 is opened to perform the heating operation.

In the above-described hot water supply operation or heating operation, the fan 7 is driven to rotate at a predetermined rotation speed for prepurge, and the burner 6 is ignited by an igniter (not shown) as shown in the flowchart of FIG. At the time of this ignition, the safety valve 27 of the original gas supply path 29 and the two gas supply paths 3
The gas switching solenoid valves 32 and 33 of 0 and 31 are opened,
Further, the gas proportional valve 28 is adjusted to the opening for ignition, and FIG.
The ignition is performed in the state of the combustion capacity 2 shown in FIG.

When the ignition of the burner 6 is detected by a frame rod (not shown), the temperature setting switch 3 of the remote controller R
The required combustion capacity of the burner 6 is calculated on the basis of the temperature set by the control unit 5, the water supply temperature detected by the water supply thermistor 11, the water flow detected by the water amount sensor 10, and so-called feedforward control is executed. If the calculated required combustion capacity is 15,000 kilocalories or more per hour, 15.0
If the calorie is less than 00 kcal, one of the gas switching solenoid valves 33 is closed to burn the burner 6 in the state of the combustion capacity 1, and the opening of the mixing valve 15 is adjusted.
Control is performed so that hot water at the temperature set by the temperature setting switch 35 is discharged.

During the combustion of the burner 6, the hot water supply temperature is detected by the hot water supply thermistor 17, and based on the detected temperature, the gas proportional valve 28 and the mixing valve 15 are detected.
Is adjusted, and so-called feedback control is also executed. When the combustion capacity becomes 20,000 kcal or more per hour during the combustion with the combustion capacity 1, the state is switched to the combustion capacity 2, and conversely, during the combustion with the combustion capacity 2, the state becomes less than 15,000 kcal. Then, the state is switched to the combustion capacity 1 and the combustion is continued. When the hot water tap is closed and the amount of water flow detected by the water amount sensor 10 becomes equal to or less than the set amount, the safety valve 27 and the gas switching electromagnetic valves 32 and 33 are closed. As a result, post-purge is executed, the operation ends, and the system returns to the hot water supply standby state or the heating operation standby state described above.

When the hot water supply operation and the heating operation are performed simultaneously, the hot water supply operation has priority. For this reason, there is a case where hot water having a higher temperature than necessary is supplied from the heating heat exchanger 2. In such a case, the desired temperature is maintained by opening and closing an unillustrated on-off valve provided in the heating device 19. You.
At the time of the single operation of the heating, one of the gas switching solenoid valves 33 is closed, and the burner 6 is burned in the state of the combustion capacity 1 where the required combustion capacity is 4,500 kcal per hour,
In addition, feedback control based on the temperature detected by the heating thermistor 24 is performed, and hot water of a predetermined temperature is supplied to the heating device 19.
When the heating operation switch 36 of the heating device 19 is turned off, the safety valve 27, the gas switching electromagnetic valve 32,
The valve 33 is closed to stop the combustion, the post-purge is executed, the heating operation ends, and the heating operation returns to the standby state.

[Other Embodiments] As the heating device 19, various types of heating devices such as a floor heating device and a bathroom heating device can be used. Further, instead of such a heating device, a bathroom dryer or the like can be used. It can also be implemented, and is generally referred to as a heat consuming device including a heating device and a bathroom dryer, and a heat exchanger for heating hot water for the heat consuming device is generally referred to as a heat exchanger for a heat consuming device. Further, in the above embodiment, the electromagnetic on-off valve 26 is shown as the on-off means for on-off supply of hot water to the heat consuming device, but a heat-responsive valve is used in place of this electromagnetic on-off valve 26. In practice, various modifications are possible.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of the entire hot water supply apparatus.

FIG. 2 is a graph showing burner combustion characteristics.

FIG. 3 is a flowchart showing an operation at the start of a hot water supply operation.

FIG. 4 is a flowchart showing an operation at the start of a heating operation.

FIG. 5 is a flowchart showing operations during a hot water supply operation and a heating operation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Heat exchanger for hot water supply 2 Heat exchanger for heating as a heat exchanger for heat consuming devices 3 Heat transfer tube of heat exchanger for hot water supply 4 Heat transfer tube of heat exchanger for heating 5 Heat transfer plate 6 Burner 8 Water supply path 9 Hot water supply Path 12 Hot water supply temperature detecting means 13 Hot water supply bypass path 14 Hot water supply auxiliary bypass path 15 Mixing means 16 Bypass valve 19 Heating device as heat consuming device 20 Return path 21 Outgoing path 22 Open-to-atmosphere tank 23 Circulation pump 24 Temperature detecting means 25 bypass passage 26 intermittent means H control means

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiken Kanoto, 1-15-1 Oka, Minami-shi, Minato-ku, Osaka City, Osaka Prefecture Inside Harman Co., Ltd. No. 52 Harman Co., Ltd. (72) Inventor Hirosho Imai 1-152 Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka (56) References JP-A-3-247951 (JP, A) 63-135744 (JP, A) Japanese Utility Model Hei 3-3664 (JP, U) Japanese Utility Model 57-120952 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 1 / 00 604 F24D 3/08

Claims (6)

(57) [Claims] 1. A hot water supply heat exchanger that heats water from a water supply channel and supplies the hot water to a hot water supply channel, and heats the hot water in a return path from the heat consuming device and supplies the hot water to an outward route to the heat consuming device. A heat exchanger for the consuming device, one burner for heating the heat exchanger for hot water supply and the heat exchanger for the heat consuming device, and an open-to-atmosphere tank provided on a return path from the heat consuming device; A hot water supply apparatus comprising: a circulation pump for circulating hot and cold water provided in a return path between an open-to-atmosphere tank and the heat exchanger for a heat consuming device; and control means for controlling the operation of the circulation pump. Connecting the outgoing path of the heat consuming device and the return path on the upstream side of the open-to-air tank by a bypass which bypasses the heat consuming device, and supplying hot water to the heat consuming device from the outgoing route. An intermittent intermittent means, wherein the control means operates the heat consuming device; Configured and Aru water heater to supply hot water to the return path via the bypass path from said disconnecting means controls to heat consuming device heat exchanger during start. 2. The control means controls the intermittent means after a predetermined time has elapsed from the start of operation of the heat consuming device, and supplies hot water from the heat consuming device heat exchanger to the heat consuming device. The hot water supply device according to claim 1. 3. A temperature detecting means for detecting a temperature of hot water from the heat exchanger for a heat consuming device, wherein the control means controls the intermittent means based on a temperature detected by the temperature detecting means. The hot water supply apparatus according to claim 1, wherein hot water from the heat exchanger for the heat consuming apparatus is configured to be supplied to the heat consuming apparatus. 4. A hot water supply bypass path and a hot water supply auxiliary bypass path connecting the water supply path and the hot water supply path so as to bypass the hot water supply heat exchanger, and water and hot water supply from the hot water supply bypass path are provided. Mixing means for mixing the hot and cold water from the heat exchanger, and a bypass valve for interrupting the flow of water in the hot water supply auxiliary bypass path, wherein the control means, when starting hot water supply, the mixing means and the bypass valve, The hot water supply apparatus according to any one of claims 1 to 3, wherein the hot water supply apparatus is configured to supply water to the hot water supply path via the hot water supply bypass path and the hot water supply auxiliary bypass path. 5. A hot water supply temperature detecting means for detecting a temperature of hot water from the hot water supply heat exchanger, wherein the control means closes the bypass valve based on a temperature detected by the hot water supply temperature detecting means. The hot water supply apparatus according to claim 4, wherein the hot water supply apparatus is configured to be valved. 6. The heating heat exchanger, wherein the heat consuming device is a heating device, and wherein the heat consuming device heat exchanger is a heating heat exchanger that heats hot water for the heating device. The hot water supply apparatus according to any one of claims 1 to 5, wherein the heat transfer tube and the heat transfer tube of the hot water supply heat exchanger share the same heat transfer plate.