JPH08159557A - Bath tub automatic hot water feeding device with fast hot water filling function - Google Patents

Abstract

PURPOSE: To provide a bath tub automatic hot water feeding device having a fast hot water feeding function capable of filling hot water to a bath tub in a short period of time under a combination of a hot water feeding gas burner and an additional boiling gas burner. CONSTITUTION: This invention relates to a bath tub automatic hot water feeding device which has a heat exchanger 3 comprising a water feeding pipe 1 and a hot water discharging pipe 2, and a gas burner 4 for heating the heat exchanger 3, and further there are provided a hot water feeding part A for supplying hot water to a bath tub 41 and an additional boiling part B for heating either water or remained hot water within the bath tub 41. Accordingly, there are provided a bypassing pipe 6 for bypassing the heat exchanger 3 and a bypassing water solenoid valve 11 arranged in the bypassing pipe 6, hot water is supplied from the hot water feeding part A to the bath tub 41 and concurrently the bypassing water solenoid valve 11 is opened to feed water from the bypassing pipe 6 toward the bath tub 41 and upon an amount of hot water within the bath tub 41 reaches such a level as one where the additional boiling can be attained, the additional boiling with the additional boiling part B is started. In addition, this device comprises a bypassing water governor 12 for restricting a flow rate of the bypassing pipe 6 to such a flow rate in which the additional hot water feeding is completed in the shortest period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bathtub automatic water heater capable of supplying hot water heated by a burner to a bathtub and heating the remaining hot water in the bathtub to raise the temperature. The present invention relates to a bathtub automatic hot water supply device with a rapid hot water filling function, which is capable of rapidly filling the bathtub with an appropriate amount of heat by using both the burner and the burner for reheating.

[0002]

2. Description of the Related Art Conventionally, bathtubs and showers at home, wash basins,
2. Description of the Related Art An automatic bathtub hot water supply apparatus is used that includes a water heater that supplies hot water to a kitchen or the like, and a bath kettle that reheats water or lukewarm water that has already accumulated in a bathtub. An example of this type of bathtub automatic hot water supply device is shown in FIG. This bathtub automatic hot water supply apparatus includes a heat exchanger 53 in which a water supply pipe 51 and a hot water discharge pipe 52 are piped, a gas burner 54 for heating water flowing through the heat exchanger 53, and a bathtub branched from the hot water discharge pipe 52. A bathtub hot water supply pipe 55 for supplying hot water to 41, a heat exchanger 66 in which a forward pipe 64 and a return pipe 65 are piped, and a gas burner 67 for heating bathtub water flowing through the heat exchanger 66 are provided. are doing. Further, a general hot water supply pipe 5 leading to a shower, a kitchen or the like (not shown) is provided downstream of a branch portion w of the hot water discharge pipe 52 with the bathtub hot water supply pipe 55.
7 is connected.

A gas proportional valve 58 for adjusting the flow rate of the fuel gas is provided in the gas burner 54, a water flow sensor 59 for detecting the presence or absence of a water flow and a water amount in the water supply pipe 51, and a water governor 60 for regulating the maximum flow rate of water. Is provided. Further, the hot water outlet pipe 52 is provided with a hot water outlet thermistor 63 for measuring the hot water outlet temperature from the heat exchanger 53, upstream of the branch point w with the bathtub hot water supply pipe 55. The gas burner 67 is provided with a gas electromagnetic valve 68 that connects and disconnects the supply of the fuel gas, and the forward pipe 64 and the hot water outlet pipe 65 are connected to the bath 41.
A bathtub hot water supply pipe 55 is connected to the heat exchanger 66 so that hot water from the hot water supply portion is poured into the bathtub 41. The bathtub hot water supply pipe 55 is provided with an automatic hot water supply valve 69 for starting and stopping hot water supply to the bathtub, and an edge cutoff valve 70 for preventing backflow of the bath water into the hot water supply portion.

When filling the bathtub with this bathtub automatic hot water supply apparatus, the gas burner 54 burns the fuel gas and the hot water heated in the heat exchanger 53 to a temperature suitable for bathing is supplied to the bathtub 41 with a predetermined amount of water, or It is usual that the gas burner 67 does not burn until the predetermined water level is reached. This is for pouring hot water whose temperature is controlled by the temperature detected by the hot water thermistor 63.

[0005]

However, the above-mentioned conventional bathtub automatic hot water supply apparatus has the following problems. That is, it takes a long time to fill the bathtub 41 with an appropriate amount of hot water for bathing. This is because the gas burner 67 for refueling combustion does not burn when hot water is supplied and only the heating power of the gas burner 54 for hot water supply and combustion is used. The specific time required for filling the water is calculated, for example, as follows.

When the output (heat output) of the gas burner 54 at the maximum thermal power is represented by H _Q and the upper limit temperature (including cooking in the kitchen) which can be heated by the heat exchanger 53 is represented by t _UP , flow rate Q can flow to the heat exchanger 53 is represented by _{Q = H Q / (t UP} -t iN) (1). Here, t _IN is the supply water temperature. Where H _Q
Is 400 kcal / min (equivalent to No. 16) and t _UP is 58 ° C., t _IN is about 25 ° C. in the summer, so Q = 400 / (58-25) = 12.1 (liter / min. (2), and in the winter when t _IN is about 5 ° C., Q = 400 / (58−5) = 7.5 (liter / minute) (3). The maximum flow rate is usually limited to this extent so that hot water of at least 58 ° C. or higher can be obtained from the water heater for supplying various hot water taps (kitchen, washroom, etc.).

Therefore, if the amount of hot water in the bathtub 41 is represented by W, the required time T ₀ for filling the water is T ₀ = W / Q (4). Therefore, if W is 200 liters, (2)
From the formula, T ₀ = 200 / 12.1 = 16.5 (min) (5) In the winter season, T ₀ = 200 / 7.5 = 26.5 (min) (6) is calculated from the formula (3). That is, the conventional bathtub automatic hot water supply apparatus requires 15 minutes or more to fill the water even in the summer and nearly 30 minutes in the winter. Those who try to take a bath are inconvenient because they are kept waiting during that time.

The present invention has been made to solve the above-mentioned problems of the prior art, and its object is to provide a water heater and a bath kettle in the case of automatically filling a bathtub with hot water. It is an object of the present invention to provide a bathtub automatic hot water supply apparatus with a rapid hot water filling function that can shorten the required time by using both gas burners together and can reliably control the hot water supply temperature to the bathtub to a desired set temperature. .

[0009]

To achieve this object, an automatic bathtub water heater (1) of the present invention comprises a heat exchanger having a water supply pipe and a hot water discharge pipe, and a gas burner for heating the heat exchanger. An automatic hot water supply part provided with a bathtub supply pipe branched from the hot water supply pipe to supply hot water to the bathtub, a circulation pipe for heating water in the bathtub or residual hot water, and a reheating part provided with a heat exchanger and a gas burner. A bathtub automatic hot water supply device having: a bypass pipe that bypasses the heat exchanger of the automatic hot water supply unit and connects the water supply pipe and the hot water discharge pipe; an on-off valve provided in the bypass passage; and the bathtub hot water supply pipe A bathtub hot water supply valve provided in the bathtub hot water supply pipe, the bathtub hot water supply pipe is branched from the downstream side of the connecting portion between the bypass pipe and the hot water discharge pipe, and both the opening and closing valve and the bathtub hot water supply valve are opened during automatic hot water supply. To supply hot water to the bathtub When the amount of hot water in the bathtub reaches a level at which the additional cooking can be performed by the additional cooking unit, additional cooking is started, and when the amount of hot water in the bathtub reaches a set amount or the water level in the bathtub reaches the set water level, the on-off valve and The gist is to provide a rapid automatic hot water supply control means for closing the bathtub hot water supply valve.

Further, the bathtub automatic hot water supply device (2) of the present invention
The rapid automatic hot water supply control means stops the additional cooking when the total heat output of the automatic hot water supply unit and the additional cooking unit has reached the amount of heat required to boil the set hot water amount in the bathtub to the set temperature. The constitution (1) is characterized.

Further, the bathtub automatic hot water supply device (3) of the present invention
Is provided with a water governor for regulating the maximum flow rate of the bypass pipe, restricting the flow rate x of the governor where x = (R / S) -Q , R = H F (1-
(W _J / W _S )) + H _Q S = t _S −t _IN Q: Flow rate through the heat exchanger H _F : Heat generation amount per hour of the reheating system W _J : In the bathtub that enables reheating Hot water amount W _S : Set hot water amount at which hot water supply to the bathtub is stopped H _Q : Maximum heat generation amount per hour of the heat exchanger t _S : Set hot water temperature at which reheating is stopped t _IN : Supply water temperature to the water supply pipe The configuration of (1) or (2) above is provided.

[0012]

According to the bathtub automatic hot water supply apparatus (1) with a rapid hot water filling function of the present invention having such a structure, when pouring water into the bathtub, the water supplied from the water supply pipe is supplied to the automatic hot water supply section. It is heated by the heat of combustion of the gas burner in the heat exchanger and mixed as hot water with the water from the bypass passage to be supplied to the bathtub from the automatic hot water supply pipe via the reheating unit. Then, when the amount of hot water in the bathtub reaches a level at which reheating by the reheating part is possible, the rapid hot water filling control means starts reheating the remaining hot water by the reheating part, and when the set amount of water or the set level is reached, hot water is supplied. It is stopped and the filling of water is completed. Further, according to the bathtub automatic hot water supply device (2) of the present invention, when the total heat output of the automatic hot water supply unit and the additional cooking unit reaches the amount of heat required to boil the set hot water amount to the set temperature, The additional cooking is stopped by the rapid automatic hot water supply control means.

Further, according to the bathtub automatic hot water supply apparatus of the present invention (3), the flow rate of the bypass passage governor, x = (R / S) -Q where, R = H _F (1-
_{(W J / W S))} + H Q S = t S -t IN Q: flow rate flowing through the heat exchanger H _F: Time per heating value of Reheating system W _J: hot water W in the bathtub that reheating is possible _S : Set hot water volume at which hot water supply to the bathtub is stopped H _Q : Maximum heat generation amount per hour of the heat exchanger t _S : Set hot water temperature at which reheating is stopped t _IN : Flow rate given by the supply water temperature to the water supply pipe x Since the amount of hot water in the bathtub reaches the predetermined set amount of hot water and the set hot water temperature at the same time, the bathtub is boiled in a short time.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a hot water supply device with a rapid hot water filling function according to the present embodiment (hereinafter simply referred to as "hot water supply device").
Shows the configuration of. This hot water supply device is basically composed of a hot water supply part A and a reheating part B.

The hot water supply unit A branches from the hot water supply pipe 1 and the hot water discharge pipe 2, a gas burner 4 for heating water flowing through the heat exchanger 3, and a hot water discharge pipe 2. A bathtub hot water supply pipe 5 for supplying hot water to the bathtub 41, a bathtub hot water supply valve 19 for starting and stopping hot water supply to the bathtub 41, and a branch portion a of the hot water supply pipe 1 and a bathtub hot water supply pipe 5 branching from the hot water supply pipe 2. And a bypass pipe 6 connected to a more upstream position. Further, a general hot water supply pipe 7 leading to a bathroom, a kitchen or the like (not shown) is connected to a downstream side of a branch portion a of the hot water supply pipe 2 with the bathtub hot water supply pipe 5.

The gas burner 4 is provided with a gas proportional valve 8 for adjusting and shutting off the flow rate of the fuel gas, and the water supply pipe 1 is provided with a water flow for detecting the presence / absence of a water flow upstream of the branch portion c with the bypass pipe 6 and the water amount. The sensor 9 is provided with a water governor 10 that regulates the maximum flow rate of water downstream from the branch portion c. The bypass pipe 6 is provided with a bypass water solenoid valve 11 and a bypass water governor 12. Further, a hot water outlet thermistor 13 for measuring the hot water outlet temperature from the heat exchanger 3 is provided in the hot water outlet pipe 2 at a position between a connection portion b with the bypass pipe 6 and a branch portion a with the bathtub hot water supply pipe 5. There is. The hot water supply unit A is formed as described above.

Here, the water governor 10 and the bypass water governor 12 have the function of changing the passage resistance according to the water temperature and changing the regulated flow rate. Therefore, they include a spring made of shape memory alloy inside. Specifically, in these, the regulated flow rate is large when the water temperature is high as in the summer, and the regulated flow rate is small when the water temperature is low as in the winter.

Next, the reheating portion B has a forward pipe 14 and a return pipe 15.
And a gas burner 17 for heating bath water flowing through the heat exchanger 16, and the gas burner 17 has a gas solenoid valve 18 for intermittently supplying the fuel gas. It is provided. The outward pipe 14 and the return pipe 15 communicate with the bathtub 41. The bathtub hot water supply pipe 5 is connected to the heat exchanger 16 so that the hot water from the hot water supply part A is poured into the bathtub 41. The bathtub hot water supply pipe 5 is provided with an edge cutoff valve 20 for preventing the bathtub water from flowing back to the hot water supply portion A.

Furthermore, the water flow sensor 9 and the hot water thermistor 13
Gas proportional valve 8, bypass water solenoid valve 1
1, a controller 22 for controlling the automatic hot water supply valve 19 and the gas solenoid valve 18. The controller 22 comprises a known CPU, ROM, RAM, etc.
It may have a ROM or the like, and has various functions such as a function of integrating the flow rates detected by the water flow sensor 9 and counting the amount of hot water supplied to the bath 41 or the like. RO of controller 22
In M, various programs for performing rapid hot water filling control, which will be described later, are stored. And RAM or E
The PROM stores the hot water supply and reheating time measured by the clock function of the CPU, the amount of heat K required for heating the bathtub 41, and the like.

The controller 22 is a remote controller 23.
It has. With the remote controller 23, the hot water supply device can be remotely operated from the bathroom, the kitchen, or the like. The remote controller 23 also has a function of displaying the operation status of the device by displaying or sounding.

Note that the bathtub 41 may be provided with a water level sensor, and the amount of hot water in the bathtub 41 may be detected by the detection signal (hereinafter referred to as "water level system"). A water flow switch that detects

Next, the operation of the water heater having the above construction will be described. There are two basic functions of this hot water supply device: a hot water supply function and a reheating function. Hot water supply function, water supply pipe 1
In the heat exchanger 3 of the hot water supply unit A, the water supplied from is heated by the combustion heat of the gas burner 4 into hot water, and is supplied from the bathtub hot water supply pipe 5 to the bathtub 41 or from the general hot water supply pipe 7 to the kitchen or the like. is there. There are two types of hot water supply functions: normal hot water supply and rapid hot water supply. A command to switch the operation of these water heaters is issued by the remote controller 23.

Normally, hot water is supplied by controlling the opening of the gas proportional valve 8 so that the bypass water solenoid valve 11 is closed and the temperature detected by the hot water thermistor 13 is a temperature suitable for the purpose of using the hot water.
The temperature suitable for the purpose of use is about 40 ° C. when using hot water in a washroom or the like, and 45 when filling the bath 41 with hot water.
The temperature is about C and can be set by the user using the remote controller 23.

Rapid hot water supply is performed from the heat exchanger 3 to the bath 4
In addition to supplying hot water to No. 1, the bypass water solenoid valve 11 is opened to increase the total flow rate and the gas burner 17 of the reheating section B is also burned, so that the bathtub 41 can be filled in a shorter time than normal filling with water. It is an attempt to satisfy the optimum bath temperature. Details of the rapid hot water supply will be described later.

On the other hand, the reheating operation is an operation of heating the hot water stored in the bath 41 in the heat exchanger 16 of the reheating section B by the combustion heat of the gas burner 17 to raise the temperature. When the gas burner 17 is burned, the bath water is naturally circulated due to the temperature difference generated by being heated in the heat exchanger 16, and flows from the bath 41 to the outward pipe 14, the heat exchanger 16, and the return pipe 15 to be in the bath 41.
Return to

Details of the rapid hot water supply will be described with reference to FIGS. 2 to 5. FIG. 2 is a control flowchart for rapid hot water supply. 3 to 5 are views showing the state of each part of the hot water supply device when performing rapid hot water supply, in which a pipe in which water or hot water is flowing is indicated by a solid line, and a pipe in which no water or hot water is flowing is indicated by a broken line. It represents. Regarding the bypass water solenoid valve 11 and the automatic hot water supply valve 19, open states are indicated by circle marks and closed states are indicated by cross marks.

When the user commands the hot water supply from the remote controller 23 while the bathtub 41 is empty, the flow shown in FIG. 2 is started. At this time, hot water is not used in the kitchen. First, in S1, the gas burner 4 of the hot water supply unit A is ignited to maximize the input, that is, the opening of the gas proportional valve 8 is fully opened, the automatic hot water supply valve 19 is opened, and the bath 41 is opened.
Hot water supply to Then, in S2, the bypass water solenoid valve 11 is opened. This is because the bathtub 41 is filled as soon as possible by using the bypass pipe 6 as well.

The flow of water or hot water in this state is shown in FIG.
Shown in The hot water heated by the heat exchanger 3 and the cold water that has passed through the bypass pipe 6 both flow into the bathtub hot water supply pipe 5, pass through the reheating portion B, and reach the bathtub 41. At this time, the reheating section B
The gas burner 17 is not burned. This is because the water level in the bathtub 41 is still low and air remains inside the forward pipe 14, the heat exchanger 16, and the return pipe 15, so that it is necessary to prevent the water heating.

Then, in S3, it is judged whether or not the detected temperature t of the hot water thermistor 13 is lower than the boiling set temperature t _S of the bath 41. The boiling setting temperature t _S is a temperature suitable for bathing and is about 45 ° C. as described above, and can be set by the user with the remote controller 23.
When the detected temperature t is lower than the set temperature t _S (S3: Y
es), and proceeds to S4. In S4, it is determined whether the detected temperature t has become equal to the set temperature t _S. Detection temperature t is not equal to the set temperature t _S, when ie lower than the set temperature t _S (S4: No), the processing proceeds to S5.

At S5, it is determined whether or not the total hot water supply amount W to the bathtub 41 (including the bypass water amount) detected by the water flow sensor 9 reaches the hot water amount W _J that fills the circulation ports of the outward pipe 14 and the return pipe 15. To judge. In the case of the water level method, the judgment is made by the detection signal of the water level sensor of the bathtub 41. When the amount W of hot water does not reach the amount W _j of hot water (S5: No), hot water supply in the state of FIG. 3 is continued as it is.

When the amount W of hot water reaches the amount W _J of hot water (S5: Ye
s), the process proceeds to S6, and the gas burner 17 of the reheating section B is ignited. This is because the water temperature in the bathtub 41 at this time needs to be reheated because it is lower than the boiling temperature set temperature t _S , and on the other hand, there is no risk of empty heating anymore. The time required from the start of rapid hot water supply to this time is stored as time T ₂ .

The state of the water heater at this time is shown in FIG.
Same as the state of FIG. 3 in that hot water heated in the heat exchanger 3 and cold water that has passed through the bypass pipe 6 both flow into the bathtub hot water supply pipe 5, pass through the reheating portion B and reach the bathtub 41. Is. However, the difference is that the gas burner 17 in the reheating section B is burned, and reheating is performed together with hot water supply.

Then, in S7, it is determined whether or not the total hot water supply amount W into the bathtub 41 detected by the water flow sensor 9 has reached the boiling set hot water amount W _S. In the case of the water level method, the judgment is made by the detection signal of the water level sensor of the bathtub 41. As for the boiling water amount W _S , the amount of hot water in the bathtub 41 is sufficient for bathing,
In addition, the amount of hot water does not overflow from the bathtub 41 even when taking a bath, and can be set by the user with the remote controller 23. When the amount W of hot water does not reach the set amount W _S of hot water (S
7: No), hot water supply and reheating in the state of FIG. 4 are continued as they are.

When the amount W of hot water reaches the set amount W _S of hot water (S7:
Yes), proceeding to S8, the automatic hot water supply valve 19 is closed to stop hot water supply from the hot water supply unit A. At this time, the elapsed time from the start of combustion in the hot water supply unit A in S1 to the stop in S8 is the hot water supply time T _{1 and} the RAM of the controller 22.
Is stored. The state of the water heater at this time is shown in FIG. The flow of both the heat exchanger 3 and the bypass pipe 6 is stopped, and the gas burner 4 is also extinguished. Then, the gas burner 17 is burned to reheat the hot water in the bathtub 41.

Then, in S9, it is determined whether or not the cumulative amount of heating by the hot water supply section A and the reheating section B up to the present since the start of hot water supply in S1 has reached the required heat quantity K. Here, the required amount of heat K is the amount of heat required to raise the set amount of water W _S (liter) of water from the supply water temperature t _IN (° C) to the set temperature t _S (° C), and K = W _S (t _S− t _IN ). This value is also represented by the product I ₀ ε of the total heat generation amount I ₀ (kcal) when the hot water supply portion A is filled with the bath 41 and the thermal efficiency ε (no unit). The calorific value and thermal efficiency of the gas burner 4 and the gas burner 17 are respectively I _Q , ε _Q ,
In terms of I _F and ε _F , I ₀ ε = I _Q ε _Q + I _F ε _F

Therefore, in the hot water supply apparatus according to the present embodiment, the value of I _Q ε _Q + I _F ε _F at the time of the previous filling of water is stored as the required heat quantity K and used for comparison in S9. Where I
_Q and I _F are determined by the gas proportional valve 8 and the gas solenoid valve 18, and ε _Q and ε _F are preset in the controller 22 for each water heater.
Stored in the ROM.

On the other hand, the cumulative heating amount is the sum of the heating amount T ₁ H _Q in the hot water supply part A and the heating amount T ₃ H _F in the reheating part B.
The heating amount T ₁ H _Q in the hot water supply part A is the maximum heating value H _Q per hour of the hot water supply time T ₁ (minutes) recorded in S8 and the gas burner 4.
It is the product of (kcal / min). Heating amount T in the reheating section B
₃ H _F is the product of the elapsed time T ₃ (minutes) from ignition of the gas burner 17 in the reheating section B to the present time and the heat generation amount H _F (kcal / min) per hour of the gas burner 17 in S6. is there.

When the cumulative amount of heat T ₁ H _Q + T ₃ H _F has not reached the required amount of heat K (S9: No), the reheating of FIG. 5 is continued. When reheating is continued, but does not increase any longer heating amount T ₁ H _Q in the hot water supply unit A, the heating amount T ₃ H _F at reheating unit B increases with increasing elapsed time T _3. Therefore, when the cumulative heating amount T ₁ H _Q + T ₃ H _F increases and reaches the required heat amount K (S9: Yes), the gas burner 1
7 is extinguished (S10). Elapsed time T _{3 at} this time
However, it is stored as the reheating time.

[0039] At this time, the _{more, K = W S (t S} -t IN) = T 1 H Q + T 3 H F = I O ε (7) is satisfied. At this time, the bathtub 41 is filled with the set amount of hot water W _{S at the} set temperature t _S , and is in a state suitable for bathing. Therefore, in S15, boiling is notified by the notification function of the remote controller 23, and the rapid hot-water filling is completed.

In S3, if the detected temperature t of the hot water thermistor 13 is not lower than the set temperature t _S (S
3: No), and proceeds to S11. In S11, the input of the gas burner 4 of the hot water supply unit A is narrowed down. That is, the opening of the gas proportional valve 8 is reduced. This is because the hot water temperature is too high and the tap water temperature of the heat exchanger 3 is lowered. Then, in S12, it is determined whether or not the detected temperature t has dropped to the set temperature t _S. If the detected temperature t has not yet dropped to the set temperature t _S (S12: No), the process returns to S11 to further narrow down the input. When the detected temperature t has dropped to the set temperature t _S (S12: Yes), hot water supply at that input is continued.

Then, in S13, it is determined whether or not the amount W of hot water in the bathtub 41 detected by the water flow sensor 19 has reached the set amount W _S of hot water. In the case of the water level method, the judgment is made by the detection signal of the water level sensor of the bathtub 41. When the amount W of hot water does not reach the set amount W _S of hot water (S13: No), hot water supply at the input is continued. When the amount W of hot water reaches the set amount W _S of hot water (S13: Yes), the hot water supply is stopped in S14. Therefore, in this case, the combustion of the reheating portion B is not performed, and S
At 15 the boil is reported and the process ends.

In S4, when the detected temperature t is equal to the set temperature t _S (S4: Yes), the process proceeds to S13 and the hot water amount W in the bath 41 is set to the set hot water amount W.
Determine whether _S has been reached. Therefore, in this case as well, the reheating part B is not burned, and the hot water amount W is equal to the set hot water amount W.
_{When S} is reached (S13: Yes), the hot water supply is stopped in S14, the boiling is notified in S15, and the process ends. The above is the flow of rapid hot water supply.

When the rapid hot water supply described above is used, the required time can be greatly shortened as compared with the case where the bathtub 41 is filled with normal hot water. This will be explained by actually calculating the required time. The time required for filling with normal hot water is the same as that described in the prior art, and is about 16.5 minutes from the formula (5) in the summer and about 26 from the formula (6) in the winter. .5 minutes. Next, the calculation is performed for the case where rapid hot water supply is used. In the following equations, in addition to the symbols already shown, the flow rate of the heat exchanger 3 regulated by the water governor 10 is indicated by Q, and the flow rate of the bypass pipe 6 regulated by the bypass water governor 12 is indicated by x.

First, the hot water supply time T ₁ from S1 to S8 in the flow of FIG. 2 is given by T ₁ = W _S / (Q + x) (8). Amount W of hot water that fills the circulation port from the start of hot water supply
The time T ₂ until reaching _J (S5: Yes) is given by T ₂ = W _J / (Q + x) (9). (9), using the equation (8), T ₂ = is also expressed as _{(W J / W S) T} 1 (10). The reheating time T ₃ ranging up to S10 S6, the (7) by deforming the _{equation, T 3 = (W S (} t S -t IN) -T 1 H Q) / H F (11) It is represented by.

The time T required for rapid hot water filling is T ₂ +
It is T ₃ , and it becomes the shortest when it is equal to T ₁ . This state occurs when S8 and S10 occur simultaneously in the flow of FIG. Therefore, it can be said that T ₁ = T ₂ + T ₃ (12). Solving for T ₁ in the equation (10) by substituting equation and _{(11), T 1 = W} S (t S -t IN) / (H F (1- (W J / W S) + (H _{Q / H F))) (} 13) is obtained.

Here, the supply water temperature t _IN is 25 ° C. in the summer,
In the winter, the temperature is 5 ° C., the boiling temperature t _S is 45 ° C., the set hot water amount W _S is 200 liters, the hot water amount W _J that fills the circulation port is 100 liters, and the maximum heat generation amount H _Q of the gas burner 4 is 400 kcal / min. (Equivalent to No. 16 capacity), the heat generation amount H _F of the gas burner 17 per hour is 150 kcal / min (9000 kcal /
Time) and calculate.

Firstly the _{summer, T 1 = (200 · 20} ) / (150 (1-0.5 + 2.7)) ( min) = 8.4 T ₁ in (min) (14) is obtained. In this case x is from (8) is a _{x = W S / T 1 -Q} (15), Q is a prior art description (2) or (3)
Since the value calculated by the formula can be used, x = 200 / 8.4-12. 1 (liter / minute) = 11.7 (liter / minute) (16)

Next in _{winter, T 1 = (200 · 40} ) / (150 (1-0.5 + 2.7)) ( min) = 16.8 T ₁ in (min) (17) is obtained. Moreover, x is calculated | required by x = 200 / 16.8-7.5 (liter / minute) x = 11.9-7.5 (liter / minute) = 4.4 (liter / minute) (18).

From the above calculation results, under the above-mentioned assumed conditions, the regulated flow rate of the bypass water governor 12 is 11.7 (liter / min) when the water temperature is about 25 ° C. as in summer.
3. When the water temperature is around 5 degrees Celsius like in winter, 4.
It can be seen that the time required for rapid hot-water filling is the shortest if it is about 4 (liter / minute). Comparing the required time at this time with that of the conventional technique calculated by the formula (5) or the formula (6), it can be seen that the time is reduced to about half in the summer and about 60% in the winter.

From the equations (13) and (15), x can be expressed by x = (R / S) -Q (19). _{Wherein, R = H F (1- (} W J / W S)) is _{+ H Q S = t S -t} IN. The x in the equation (19) represents the regulated flow rate of the bypass water governor 12 for minimizing the time required for the rapid filling of water.

As described in detail above, in the hot water supply apparatus with rapid hot water filling function according to the above embodiment, the bypass pipe 6 for bypassing the heat exchanger 3 of the hot water supply part A is provided, and the bypass pipe 6 is provided.
Since the bypass water solenoid valve 11 is provided in the bathtub 41, when the bathtub 41 is filled with hot water, the hot water is supplied from the heat exchanger 3 and the bypass pipe 6 is provided.
You can also increase the total flow rate by using the
1 can be satisfied in the set hot water amount W _S in a short time. Further, since the reheating part B for reheating the remaining hot water in the bathtub 41 is provided, and the reheating part B is started after the amount of hot water in the bathtub 41 reaches the rewritable hot water amount W _J , the reheating part B No heating of the heat exchanger 16 occurs, and
The hot water in the bathtub 41 heated by the two gas burners can be boiled to the set hot water temperature t _S in a short time.

Further, when the amount of hot water in the bathtub 41 reaches the set amount of hot water W _S , the hot water supply from the heat exchanger 3 is stopped and the bypass water solenoid valve 11 is closed, so that too much hot water stays in the bathtub 41. There is no. Further, since the reheating is stopped when the hot water in the bathtub 41 reaches the set hot water temperature t _S , the hot water in the bathtub 41 does not become excessively hot.

In addition, the bypass water governor 1 is attached to the bypass pipe 6.
Since 2 is provided and the flow rate of the water flowing through the bypass pipe 6 is set to the value of x represented by the equation (19), the reheating is finished at the same time as the end of the hot water supply, and the boiling of the bath 41 is quick. Further, since the regulated flow rate of the bypass water governor 12 changes according to the supply water temperature t _IN , rapid filling can be performed regardless of the season or the like. Thus, an excellent hot-water supply device with a rapid hot-water filling function, which does not have to wait until boiling and does not have to be heated, is realized.

It should be noted that the above embodiments do not limit the present invention at all, and it is needless to say that various modifications and improvements can be made without departing from the gist of the present invention. For example, various numerical values and the like in the above embodiments are merely examples,
It is not limited to these.

[0055]

As is apparent from the above description, in the water heater with rapid hot water filling function of the present invention, the bypass passage for bypassing the heat exchanger of the automatic hot water supply unit and the on-off valve for opening / closing the bypass passage are provided. Since it was decided to supply water to the bathtub from the automatic hot water supply unit via the reheating unit and also to supply water from the bypass to the bathtub via the reheating unit, it is possible to fill the set amount of hot water in a short time with a large flow rate. it can. Then, when the amount of hot water reaches a level at which reheating is possible, it is decided to start reheating the hot water by the reheating unit, so while preventing the empty heating of the reheating unit, the heating power of the automatic hot water supply unit and the reheating unit is increased. Can be used together to boil to the set water temperature in a short time. Further, since it has been decided to stop both the hot water supply from the automatic hot water supply unit and the water supply from the bypass passage when the bath water reaches the set hot water amount, the hot water amount in the bathtub does not exceed the set hot water amount.

When the total heat output of the automatic hot water supply unit and the reheating unit reaches the required predetermined amount of heat, the reheating unit stops the reheating, so that the bathtub hot water temperature exceeds the set hot water temperature. There is no such thing. In addition, since the governor is equipped with a governor that regulates the flow rate of the water flowing through the bypass to a predetermined value that changes depending on the temperature of the supplied water, hot water supply and reheating are completed at the same time regardless of the season, etc. . Thus,
There is no need to wait for a long time from the start of boiling to boiling, and there is provided a bathtub automatic hot water supply device with a rapid filling function that eliminates the risk of emptying, and its industrial effect is great.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a bathtub automatic hot water supply apparatus with a rapid hot water filling function according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a control routine for rapid hot water supply.

FIG. 3 is a diagram illustrating a state of the device before starting reheating while performing rapid hot water supply.

FIG. 4 is a diagram illustrating a state of the device after the start of reheating while performing rapid hot water supply.

FIG. 5 is a diagram illustrating a state of the device when hot water supply is stopped and reheating is continued.

FIG. 6 is a schematic configuration diagram of a conventional hot water supply device.

[Explanation of symbols]

 1 Water Supply Pipe 2 Hot Water Pipe 3 Heat Exchanger 4 Gas Burner 6 Bypass Pipe 11 Bypass Water Solenoid Valve 12 Bypass Water Governor 22 Controller A Hot Water Supply Section B Reheating Section

Claims (3)

[Claims] 1. An automatic hot water supply unit provided with a heat exchanger having a water supply pipe and a hot water discharge pipe, a gas burner for heating the heat exchanger, and a bathtub supply pipe branched from the hot water discharge pipe to supply hot water to the bathtub. In a bathtub automatic water heater having a circulation pipe for heating water in the bathtub or remaining hot water and a reheating part provided with a heat exchanger and a gas burner, a water supply pipe bypassing the heat exchanger of the automatic hot water supply part And a hot water outlet pipe, and a bypass pipe, an opening / closing valve provided in the bypass passage, and a bathtub hot water supply valve provided in the bathtub hot water supply pipe, wherein the bathtub hot water supply pipe is the bypass pipe and the hot water discharge pipe. It branches off from the downstream side of the connection part with, and at the time of automatic hot water supply, both the on-off valve and the bathtub hot water supply valve are opened to supply hot water to the bathtub, and the amount of hot water in the bathtub is set to a level at which additional heat can be cooked by the cooker. When it reaches A rapid automatic hot water supply control means for closing the on-off valve and the hot water supply valve when the amount of hot water in the bathtub reaches a set amount or the water level in the bathtub reaches the set water level. Automatic bath water heater for bath. 2. The rapid automatic hot water supply control means stops additional cooking when the total heat output of the automatic hot water supply unit and the additional cooking unit reaches the amount of heat required to boil the set amount of hot water in the bathtub to the set temperature. The bathtub automatic hot water supply apparatus according to claim 1, wherein: Wherein a water governor for regulating the maximum flow rate of the bypass pipe, restricting the flow rate x of the governor where x = (R / S) -Q , R = H F (1-
(W _J / W _S )) + H _Q S = t _S −t _IN Q: Flow rate through the heat exchanger H _F : Heat generation amount per hour of the reheating system W _J : In the bathtub that enables reheating Hot water amount W _S : Set hot water amount at which hot water supply to the bathtub is stopped H _Q : Maximum heat generation amount per hour of the heat exchanger t _S : Set hot water temperature at which reheating is stopped t _IN : Supply water temperature to the water supply pipe It is provided, The bathtub automatic hot water supply apparatus of Claim 1 or Claim 2 characterized by the above-mentioned.