JPH0989372A - Hot water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the temperature of hot water in a general hot water supply path accurately by keeping a high temperature hot water supply valve opened by a hot water supply control means until the temperature of hot water in the general hot water supply path heated to a high temperature lowers because of the inflow of high temperature hot water from a hot water supply path when interruption is made for general hot water supply. SOLUTION: When a hot water supply plug 11 is opened during a additional boiling mode, an interruption for general hot water supply is executed based on the detection of an interrupt sensor 16. In the interruption for the general hot water supply, a hot water supply control means H computes a necessary amount of a gas from the temperature set by a temperature setting switch 33 of a main remote control Ra based on the amount of water detected by a water quantity sensor 5 and the temperature of water detected by a water supply thermistor 6 to adjust the opening or the like of an electromagnetic proportional valve 26. At the same time, the opening of an additional boiling valve 22 is adjusted based on the detected temperature of water fed of the water supply thermistor 6. This lowers the temperature of hot water in the general hot water supply path more accurately and quickly thereby reducing the possibility of discharging high temperature hot water from the hot water supply plug.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater having a heat exchanger for heating water from a water supply passage by burning a burner and supplying the water to the hot water supply passage, and the hot water supply passage for supplying water to a general hot water tap. A general hot water supply passage, a bypass passage connecting the general hot water supply passage and the water supply passage, a bypass valve provided in the bypass passage, and a hot water supply passage for supplying high-temperature hot water. A high temperature hot water supply path for connection, a high temperature hot water supply valve provided in the high temperature hot water supply path, a hot water supply device, a bypass valve, and hot water supply control means for controlling the high temperature hot water supply valve. The present invention relates to a hot water supply device configured to supply the water in the water supply passage to the general hot water supply passage through the bypass passage when there is an interruption of the general hot water supply during hot water supply to the hot water supply passage.

[0002]

2. Description of the Related Art As a hot water supply apparatus having such a structure, it is used for various purposes such as reheating hot water from a high temperature hot water supply path to a bathtub to wash hot water and washing dishes with high temperature hot water.
It is actually being implemented. By the way, taking a hot water supply device for baths that reheats hot water with high-temperature hot water as an example, conventionally, when there is an interruption of general hot water supply during hot water supply to the bathtub, the hot water supply control means for controlling the water heater, etc. Close the heating valve to stop hot water supply to the bathtub, supply water from the water supply channel to the general hot water supply channel via the bypass channel, and use the water from this water supply channel to lower the hot water temperature of the general hot water channel. Was configured into.

[0003]

As described above, the water in the water supply channel is supplied to the general hot water supply channel to reduce the temperature of the hot water, but the temperature of the hot water in the reheating hot water is generally 90 ° C.
Since the high temperature above is high and the hot water remaining in the heat exchanger etc. flows to the general hot water supply passage when the reheating valve is closed, the bypass valve is fully opened to supply a large amount of water to the general hot water supply passage. Even if the water is supplied to the hot water, for example, when the temperature of the water is high, such as in the summer, the temperature of the hot water is insufficiently lowered, and hot water of a considerably high temperature may be discharged from the hot water tap.

The present invention eliminates the above-mentioned conventional drawbacks, and an object thereof is to more reliably provide a general hot water supply when an interruption of the general hot water supply occurs during hot water supply to a high-temperature hot water supply passage such as an additional heating passage. It is to provide a hot water supply device capable of lowering the hot water temperature in a passage.

[0005]

In order to achieve this object, according to the invention described in claim 1, when there is an interruption of general hot water supply during high temperature hot water supply to the high temperature hot water supply passage, water in the water supply passage is bypassed. Not only to supply to the general hot water supply passage through the passage, the hot water supply control means keeps the high temperature provided in the high temperature hot water supply passage until the hot water temperature of the general hot water supply passage becomes high due to the inflow of high temperature hot water from the hot water supply passage. Since the hot water supply valve is maintained in the open state, part of the hot water remaining in the heat exchanger, etc. flows to the high temperature hot water supply passage side as it is, and the remaining part flows to the general hot water supply passage side. Become. Then, since the water in the water supply channel is mixed with part of the high-temperature hot water that has flowed to the general hot water supply channel side, the hot water temperature in the general hot water supply channel will decrease more reliably and quickly. The possibility of high temperature hot water being discharged is reduced.

According to the second aspect of the present invention, there is provided hot water supply temperature detecting means for detecting the temperature of hot water supplied to the hot water supply passage, and the hot water supply control means uses the hot water supply temperature detecting means at the time of a general hot water supply interruption. Until the detected hot water temperature falls below the specified temperature,
Since the high temperature hot water supply valve is maintained in the open state,
It is possible to more reliably avoid the situation where hot water is discharged from the hot water tap.

According to the third aspect of the present invention, the hot water supply control means maintains the high temperature hot water supply valve in the open state until a fixed time elapses during a general hot water supply interruption. Although the reliability is slightly lowered as compared with the case where the hot water supply temperature detecting means is provided as described above, the hot water supply temperature detecting means and the like are not required, and the structure can be implemented with a simple structure.

According to the invention described in claim 4, a flow rate changing means is provided in the high temperature hot water supply passage, and the hot water supply control means sets the flow rate of the high temperature hot water supply passage to a set flow rate at the time of a general hot water supply interruption. Since the flow rate changing means is operated to change, for example, according to the hot water supply temperature detected by the hot water supply temperature detecting means, if the detected hot water supply temperature is high, the flow rate of the high temperature hot water supply passage is increased, and if it is low, it is decreased. Further, in the case of having a water supply temperature detecting means for detecting the temperature of the water in the water supply passage, depending on the water supply temperature detected by the water supply temperature detecting means, the flow rate is increased when the detected water supply temperature is high and decreased when the water supply temperature is low. By doing so, it is possible to prevent discharge of high-temperature hot water from the hot-water tap, and to prevent supply of extremely low-temperature hot water, while shortening the time until execution of general hot-water supply.

According to the fifth aspect of the present invention, the high-temperature hot-water supply passage is a reheating passage for additional hot-water supply to the bathtub, and the high-temperature hot-water supply valve and the flow rate changing means are provided in the reheating passage. Since it is a reheating valve, it prevents hot water from being discharged from the hot water tap when there is an interruption of general hot water supply during reheating hot water, and does not supply extremely low temperature hot water. The time until execution of general hot water supply can be shortened, and moreover, the high-temperature hot water supply valve and the flow rate changing means can be used together by one reheating valve, and the cost can be reduced by reducing the number of parts.

According to the sixth aspect of the present invention, a water supply temperature detecting means for detecting the temperature of the water from the water supply passage is provided, and the hot water supply control means detects the water supply temperature detecting means at the time of the general hot water supply interruption. The higher the feed water temperature, the larger the opening degree of the reheating valve, and the lower the detected feed water temperature, the smaller the opening degree of the reheating valve. Therefore, in this case also, While preventing the discharge of high-temperature hot water, it does not supply extremely low-temperature hot water, and the opening of the reheating valve is changed based on the temperature of the water supplied to the heat exchanger. Compared with the one that changes the opening based on the hot water supply temperature supplied from the exchanger, the opening of the reheating valve can be changed more quickly, and the time until the execution of general hot water supply can be further shortened. You can

According to the seventh aspect of the invention, since the hot water supply control means fully opens the bypass valve at the time of interrupting the general hot water supply, the water in the water supply passage is supplied to the general hot water supply passage through the bypass passage. A large amount of water can be supplied to the general hot water supply passage, and the hot water temperature in the general hot water supply path can be rapidly reduced to further shorten the time until the execution of the general hot water supply.

[0012]

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. FIG. 1 shows an outline of the whole hot water supply device for a bath, and a fin-tube type heat exchanger 3 for heating water supplied from a water supply passage 1 to supply it to the hot water supply passage 2, and this heat exchanger 3 A water heater A is constituted by a gas burner 4 for heating the water, and the water supply passage 1 is provided with a water amount sensor 5 for detecting a water flow amount and a water supply thermistor 6 as a water supply temperature detecting means for detecting a water supply temperature.
The hot water supply passage 2 is provided with a hot water supply thermistor 7 as hot water supply temperature detecting means for detecting the hot water supply temperature.

A hot water supply passage 2 is provided in the hot water supply passage 2 for supplying hot water after heating by the heat exchanger 3 to the bathtub 8 for filling the hot water.
Are connected to each other, and the other end of the water filling passage 9 is connected to the bathtub 8 via the bath adapter 10, and the hot water supply passage 2 shares a part of the water filling passage 9 with a karan or A general hot water supply passage 1 having a general hot water tap 11 such as a shower
2 are connected in communication. A check valve 13, an electromagnetic water proportional valve 14, and a mixing thermistor 15 are provided from the upstream side in the common portion of the general hot water supply passage 12 and the hot water supply passage 9, and the general hot water supply passage 12 has an interrupt sensor. 16, the hot water supply passage 2 has an electromagnetic water filling valve 17 and a vacuum breaker 1
8 and 8 are provided respectively.

In the common portion of the general hot water supply passage 12 and the water filling passage 9, a bypass passage 19 connected to the water supply passage 1 is connected to a portion between the check valve 13 and the water proportional valve 14. ,
In addition, an electromagnetic bypass valve 20 is provided in the bypass passage 19. The bypass passage 19 is composed of two bypass passages, a large-diameter bypass passage 19a and a small-diameter bypass passage 19b. The large-diameter bypass passage 19a has a large-diameter bypass valve 20a and the small-diameter bypass passage 19b has a small-diameter bypass passage. A valve 20b is provided.

The hot water supply passage 2 is further connected to an additional heating passage 21 as a high temperature hot water supply passage for supplying high temperature hot water of about 93 ° C., and the other end of the additional heating passage 21 is filled with the hot water. It is connected to the hot water passage 9 downstream of the valve 17 and upstream of the vacuum breaker 18. That is, the additional heating passage 21 that supplies high-temperature hot water for additional heating hot water is connected to the bathtub 8 via the bath adapter 10 while sharing a part of the hot water filling passage 9, and this additional heating passage 21 is provided with a reheating valve 22 as an electromagnetic high-temperature hot water supply valve, and this reheating valve 22 also functions as a flow rate changing means for changing the flow rate of the hot water in the reheating passage 21.

The gas burner 4 is divided into three blocks, a first burner block 4a, a second burner block 4b, and a third burner block 4c, and each burner block 4a, 4b, 4c is supplied with a main fuel gas. Three fuel gas supply paths 24a, 24b, 2 branched from the path 23
4c is these three burner blocks 4a, 4b, 4c
Are connected so as to separately supply fuel gas. These three fuel gas supply paths 24a, 24b, 2
4c is an electromagnetic interrupting valve 2 for interrupting the supply of fuel gas.
5a, 25b, 25c, and an electromagnetic proportional valve 26 with a governor and an electromagnetic safety valve 27 are provided in the main fuel gas supply passage 23, and an igniter 28 for ignition and ignition are further provided. A flame rod 29 for detection and a fan 30 for supplying primary air and secondary air for combustion to the gas burner 4 as well as air for cooling are also provided.

The hot water supply apparatus having such a structure is configured so that its operation is controlled by the hot water supply control means H composed of a microcomputer, and the main remote controller Ra and the bathroom remote controller Rb for giving a control command to the hot water supply control means H. It is connected wirelessly or by wire. The main remote controller Ra has an operation switch 31 for instructing start and stop of hot water supply, a hot water filling switch 32, a temperature setting switch 33 for setting a general hot water supply temperature, and the bathroom remote controller Rb also has an operation switch 34 and a hot water filling switch. 35, a filling temperature setting switch 36 for setting the filling temperature, a reheating switch 37, and the like are provided.

Next, the control operation of the hot water supply device will be described. When the operation switch 31 of the main remote controller Ra or the operation switch 34 of the bathroom remote controller Rb is turned on, the hot water can be supplied. In this state where hot water can be supplied, when the hot water tap 11 is opened and more water than the set amount of water passes through the water supply passage 1, the water amount sensor 5 detects and drives the fan 30 to rotate and opens the safety valve 27. Intermittent valve 2
5a, 25b, 25c are opened, and an electromagnetic proportional valve 2
6 is set in the warm ignition position, ignited by the igniter 28, and confirmed by the frame rod 29.

At this time, the hot water supply control means H causes the water amount sensor 5 to
Based on the detected water amount by the water supply thermistor 6 and the water temperature detected by the water supply thermistor 6, the required heat amount is calculated from the set temperature by the temperature setting switch 33 of the main remote controller Ra. If all the valves are opened and the three burner blocks 4a, 4b, 4c are burned and a low heat quantity is sufficient, only the intermittent valve 25a is opened and only the first burner block 4a is burned. For example, the intermittent valves 25a and 25b are opened to burn the first burner block 4a and the second burner block 4b. At the same time, the temperature setting switch 3 of the main remote controller Ra
When the temperature set by 3 is high, the large-diameter bypass valve 2
0a is closed and only the small diameter bypass valve 20b is opened. When the set temperature is low, the large diameter bypass valve 20a and the small diameter bypass valve 20b are opened, and in the case of an intermediate temperature,
Only the large-diameter bypass valve 20a is opened.

In this way, a part of the water from the water supply passage 1 is heated by the heat exchanger 3 and the bypass passage 19
It is mixed with water from and discharged from the hot water tap 11. At that time, the hot water supply control means H calculates the required gas amount from the set temperature based on the water amount detected by the water amount sensor 5 and the water temperature detected by the water supply thermistor 6, and adjusts the opening degree of the electromagnetic proportional valve 26. The rotation speed of the fan 30 is set to a predetermined rotation speed. After that, the opening degree of the electromagnetic proportional valve 26 and the rotation speed of the fan 30 are finely adjusted so that the temperature detected by the mixing thermistor 15 becomes the set temperature, and all three burner blocks 4a, 4b, 4c are adjusted. If the temperature detected by the mixing thermistor 15 is not higher than the set temperature even after the maximum combustion, the water proportional valve 14
It is controlled to reach the set temperature by squeezing.

When the hot water filling switch 32 of the main remote controller Ra or the hot water filling switch 35 of the bathroom remote controller Rb is turned on while the hot water can be supplied as described above, the hot water filling mode is set and hot water supply to the bathtub 8 is executed and the bathroom From the temperature set by the hot water filling temperature setting switch 36 of the remote controller Rb, as in the case of general hot water supply, the hot water supply control means H calculates the required gas amount and adjusts the opening of the electromagnetic proportional valve 26 and the like, and the mixing thermistor. A minute adjustment is made so that the temperature detected by 15 becomes the set temperature. When the hot water tap 11 is opened during this hot water filling mode, the hot water filling valve 16 is closed based on the detection of the interrupt sensor 16, the above-mentioned general hot water supply is executed, and the hot water filling is restarted after the end of the general hot water supply.

With the hot water supply possible, the bathroom remote control R
When the reheating switch 37 of b is turned on, the reheating mode is set, the reheating valve 22 is opened, and all the water from the water supply passage 1 is heated by the heat exchanger 3 and supplied to the bathtub 8. In this additional heating mode, the hot water supply control means H calculates the necessary gas amount based on the water amount detected by the water amount sensor 5 and the water temperature detected by the water supply thermistor 6 so that the temperature detected by the hot water supply thermistor 7 becomes 93 ° C. The opening of the electromagnetic proportional valve 26 is adjusted to set the rotation speed of the fan 30, and the electromagnetic proportional valve 26 is set based on the temperature detected by the hot water supply thermistor 7.
Finely adjust the opening of.

Even in this reheating mode, the hot water tap 1
When 1 is opened, the interrupt of the general hot water supply is executed based on the detection of the interrupt sensor 16. At the time of this general hot water supply interruption, the hot water supply control means H calculates the required gas amount from the temperature set by the temperature setting switch 33 of the main remote controller Ra based on the water amount detected by the water amount sensor 5 and the water temperature detected by the water supply thermistor 6. Then, the opening degree of the electromagnetic proportional valve 26 is adjusted, but at the same time, as shown in FIG. 2, the opening degree of the reheating valve 22 is adjusted based on the detected incoming water temperature of the water supply thermistor 6.

That is, if the incoming water temperature detected by the water supply thermistor 6 is lower than a certain set temperature T ₁ , as shown in FIG. 3, the opening amount of the reheating valve 22 is made small and the amount of water Q _s detected by the water amount sensor 5 is reduced. controlled to be Q _1, it is higher than the set temperature T ₂ which is detected entering water temperature, and the opening of the reheating valve 22 to atmospheric, the detection amount of water Q _s is controlled to be Q _2. Then, the incoming water temperature detected by the water supply thermistor 6 is T ₁
Between T ₂ and T ₂ , the detected water amount Q _s is Q ₁ + (Q ₂ −Q
₁ ) / (T ₂ −T ₁ ), the opening degree of the reheating valve 22 is adjusted, and high temperature hot water in the heat exchanger 3 is purged at a flow rate of Q _s . Further, simultaneously with the purging of the high-temperature hot water, the large-diameter bypass valve 20a and the small-diameter bypass valve 20b are both fully opened, and when the hot water temperature detected by the hot water supply thermistor 7 falls below a certain set temperature T ₀ , the reheating valve 22 is closed. Ends the purge.

[Another Embodiment] In the above-described embodiment, the power is detected on the basis of the water temperature detected by the water supply thermistor 6.
Although the configuration in which the flow rate is changed is shown, the purge flow rate can be constant, and when the hot water temperature detected by the hot water supply thermistor 7 becomes T ₀ or less, the reheating valve 22 is closed. Although the structure for terminating the purging is shown, it is also possible to close the reheating valve 22 after a lapse of a certain time after interruption of the general hot water supply.

Further, although the hot water supply device for bath using the hot water supply passage as the additional heating passage 21 is exemplified, hot water supply device such as a water supply device for washing dishes for supplying hot water from the high temperature water supply passage to the dishwasher is supplied. It can be applied to various hot water supply devices.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an entire bath water heater.

FIG. 2 is a flowchart showing an operation at the time of interrupting general hot water supply during reheating.

FIG. 3 is a graph showing the relationship between purge flow rate and incoming water temperature.

[Explanation of symbols]

1 Water Supply Channel 2 Hot Water Supply Channel 3 Heat Exchanger 4 Burner 6 Water Supply Temperature Detection Means 7 Hot Water Temperature Detection Means 8 Bathtub 11 Hot Water Supply Plug 12 General Hot Water Supply Channel 19 Bypass Path 20 Bypass Valve 21 High-temperature Hot Water Supply Channel 22 High Temperature Hot Water Supply Valve And a reheating valve A as a flow rate changing means A water heater H hot water control means

Claims (7)

[Claims] 1. A water heater (A) having a heat exchanger (3) for heating the water from the water supply passage (1) by combustion of a burner (4) and supplying it to the hot water supply passage (2), and a general hot water supply. Stopper (11)
A general hot water supply passage (12) communicating with the hot water supply passage (2) for supplying hot water to the hot water supply passage, and a bypass passage (19) connecting the general hot water supply passage (12) and the water supply passage (1). A bypass valve (20) provided in the bypass passage (19),
A high temperature hot water supply passage (21) connected to the hot water supply passage (2) for supplying high temperature hot water, a high temperature hot water supply valve (22) provided in the high temperature hot water supply passage (21), and the water heater (A). ), A bypass valve (20), and a hot water supply control means (H) for controlling the high temperature hot water supply valve (22), the hot water supply control means (H) supplying hot water to the high temperature hot water supply passage (21). A hot water supply device configured to supply the water in the water supply passage (1) to the general hot water supply passage (12) via the bypass passage (19) when the interruption of the general hot water supply occurs in the hot water supply control. When the means (H) interrupts the general hot water supply, the high temperature hot water supply valve (22) is kept until the hot water temperature of the general hot water supply passage (12) becomes high due to the inflow of high temperature hot water from the hot water supply passage (2). Water heater configured to maintain the valve open. 2. A hot water supply temperature detecting means (7) for detecting the temperature of hot water supplied to the hot water supply passage (2) is provided, and the hot water supply control means (H) makes the hot water supply temperature detecting means at the time of a general hot water supply interruption. Until the hot water temperature detected by (7) falls below the specified temperature,
The hot water supply apparatus according to claim 1, wherein the high temperature hot water supply valve (22) is configured to be maintained in an open state. 3. The high-temperature hot water supply valve (2) until the hot water supply control means (H) interrupts a general hot water supply until a predetermined time elapses.
2) is configured to be maintained in an open state.
Hot water supply device described. 4. The high-temperature hot-water supply passage (21) is provided with a flow rate changing means (22), and the hot-water supply control means (H) sets the flow rate of the high-temperature hot-water supply passage (21) to a set flow rate during a general hot-water supply interruption. The hot water supply apparatus according to claim 2 or 3, wherein the hot water supply device is configured to change the flow rate changing means (22). 5. The high temperature hot water supply passage (21) is a reheating passage for reheating the hot water to the bathtub (8), and the high temperature hot water supply valve (22) and the flow rate changing means (22) The hot water supply device according to claim 4, which is a reheating valve provided in the passage (21). 6. A water supply temperature detecting means (6) for detecting the temperature of water from the water supply passage (1) is provided, and the hot water supply control means (H) is configured to detect the water supply temperature when a general hot water supply interruption occurs. The higher the feed water temperature detected by 6), the more the reheating valve (2
The hot water supply apparatus according to claim 5, wherein the opening degree of the reheating valve (22) is changed to be smaller as the opening degree of 2) is larger and the detected water supply temperature is lower. 7. Hot water supply according to claim 1, 2, 3, 4, 5 or 6, wherein the hot water supply control means (H) controls the bypass valve (20) to be fully opened at the time of a general hot water supply interruption. apparatus.