JP2017015274A - Bath hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for draining from a hot water filling control device of a bath hot water supply system which includes a circulation pump.SOLUTION: A hot water filling control device is provided in a hot water supply passage for connecting a water heater and a bathtub, and a circulation pump is connected between the bathtub and the hot water filling control device. The hot water filling control device includes a solenoid valve for opening/closing the hot water supply passage, and a check valve is installed on the bathtub side of the solenoid valve, and an atmosphere release valve is connected between the check valve and the solenoid valve. Then, after execution of a draining step in which a drain plug is opened after closing the valve of a water supply main stopcock, and also in a state where the operation of the circulation pump is continued, the solenoid valve is opened, and the circulation pump starts the operation at least a little earlier than the valve opening of the solenoid valve. Thus, when the drain step is performed in the state where a negative pressure is held between the check valve and the solenoid valve, the atmosphere release valve is still in a valve closed state, and the negative pressure of the circulation pump reaches the upstream side of the solenoid valve as well, so that not only between the check valve and the solenoid valve but also the hot water on the upstream side can be sucked by the circulation pump and discharged.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a bath water supply system in which a hot water supply device is connected to a bathtub via a hot water controller, and a circulation pump for sucking and circulating hot water in the bathtub is connected between the bathtub and the hot water controller. Specifically, the present invention relates to a technique for draining water from a hot water controller when draining a hot water supply apparatus.

  In a bath hot water system in which hot water generated by a hot water supply device is used to fill a bathtub, a hot water tension control device is provided in a hot water supply passage for supplying hot water from the hot water supply device to the bathtub. The hot water control apparatus includes an electromagnetic valve, a filter, a check valve, and the like. The solenoid valve can open and close the hot water supply passage, the hot water is filled in the bathtub by opening the electromagnetic valve, and the hot water filling is stopped by closing the solenoid valve. The filter is provided on the upstream side of the solenoid valve (on the side of the hot water supply device), and removes foreign matters contained in the hot water flowing through the hot water supply passage to prevent the electromagnetic valves from biting in the foreign matter. The check valve is provided on the downstream side (tub side) of the solenoid valve and is urged in the valve closing direction to close the hot water supply passage. When the pressure of the hot water supplied from the hot water supply device exceeds a predetermined valve opening pressure due to the opening of the solenoid valve, the check valve opens to allow hot water to pass through. On the other hand, the check valve closes when the supply pressure of hot water to the hot water supply device decreases due to water outage during the hot water filling and the pressure of hot water supplied from the hot water supply device decreases. The hot water is prevented from flowing back from the bathtub side to the hot water supply side through the passage.

  Further, in such a hot water control apparatus, it has been proposed to connect an air release valve between the check valve and the electromagnetic valve (for example, Patent Document 1). The air release valve is urged in the valve opening direction by a valve opening spring, and is closed against the urging force of the valve opening spring by receiving the supply pressure of clean water. When the supply pressure of clean water decreases, the air release valve is opened by the biasing force of the valve opening spring, and hot water can be discharged from between the check valve and the solenoid valve. Therefore, even when the check valve is not completely closed for some reason, it is possible to prevent the hot water from flowing backward from the bathtub side to the hot water supply device side. In addition, the air release valve opens when the user closes the water supply main valve and stops the supply of clean water when draining the hot water supply device. It is available for draining water between.

  Furthermore, in some hot water supply systems, a circulation pump that draws hot water from the bathtub and circulates it is connected between the bathtub and the hot water controller to recharge the hot water in the bathtub. (For example, patent document 2).

JP 2009-270698 A JP 2008-298109 A

  However, the bath hot water system as described above has a problem that even if the hot water supply device is drained, the hot water tension control device may not be drained. This is due to the following reason. First, in a bath water supply system in which a circulation pump is connected to the downstream side (tub side) of the hot water controller, as the circulating pump operates and sucks hot water from the bathtub, the check valve of the hot water controller is When negative pressure is generated on the downstream side and the check valve is opened by the negative pressure, a negative pressure is generated between the check valve and the solenoid valve. After that, when the circulation pump is stopped and the check valve is closed, the negative pressure is kept between the check valve and the solenoid valve. Even when the supply of clean water is stopped by closing the air, the air release valve may not be opened due to the negative pressure, and the hot water between the check valve and the electromagnetic valve remains without being removed. In addition, when the water heater is drained with no negative pressure between the check valve and the solenoid valve, the air release valve opens when the supply of clean water is stopped. Both the valve and solenoid valve remain closed, and in order for water to flow out from the atmosphere release valve, replacement air must also flow from the atmosphere release valve. Due to the stagnation, the hot water between the check valve and the solenoid valve may remain without being removed.

  The present invention has been made in response to the above-described problems in the prior art, and an object thereof is to provide a technique capable of easily draining water from a hot water controller of a bath hot water system having a circulation pump.

In order to solve the above-described problems, the bath hot water supply system of the present invention employs the following configuration. That is,
A hot water control device provided in a hot water supply passage for supplying hot water to the bathtub from the hot water supply device controls the hot water filling of the bathtub, and a circulation pump connected between the bathtub and the hot water control device. In the bath hot water system that can suck out and circulate hot water in the bathtub by operating,
The hot water controller is
An electromagnetic valve for opening and closing the hot water supply passage;
The solenoid valve is provided closer to the bathtub than the solenoid valve and is urged in the valve closing direction to close the hot water supply passage, and opens when the pressure of the hot water on the solenoid valve side exceeds a predetermined valve opening pressure. A stop valve,
Upon receiving the pressure of clean water supplied to the hot water supply device, the valve closes against the urging force of the valve opening spring, and when the pressure of the clean water drops, the check valve and the solenoid valve are opened. And an air release valve that can discharge hot water between
After the water supply main tap for stopping the supply of clean water to the hot water supply device is closed, after the water draining step for opening the drain tap for draining water from the hot water supply device is performed, and the circulation In a state where the operation of the pump is continued, a drainage control means for opening the solenoid valve is provided,
The drainage control means starts the operation of the circulation pump at least before opening of the electromagnetic valve.

  Here, in the present invention, “starting the operation of the circulation pump at least before opening the solenoid valve” may start the operation of the circulation pump before closing the water supply main plug, It may be started between the closing of the main plug and the opening of the drain plug, or may be started between the opening of the drain plug and the opening of the solenoid valve.

  In the bath hot water system of the present invention, as described above, the water draining step of the hot water supply apparatus (opening the drain plug after closing the water supply main plug while the negative pressure is maintained between the check valve and the solenoid valve) ), The air release valve remains closed due to the negative pressure, and the check valve opens due to the negative pressure due to the operation of the circulation pump. Pressure acts. Then, when the solenoid valve is opened while continuing the operation of the circulation pump, the negative pressure of the circulation pump reaches the upstream side of the solenoid valve and upstream (for example, between the filter and the solenoid valve) of the solenoid valve. If hot water remains, the hot water is sucked by the circulation pump. Furthermore, the negative pressure between the check valve and the solenoid valve is eliminated by the air flowing into the downstream side through the solenoid valve from the upstream side of the hot water supply passage opened to the atmosphere by opening the drain plug. Therefore, the air release valve opens. The hot water between the check valve and the solenoid valve is sucked by the circulation pump with the inflow of air from the air release valve thus opened, or the hot water between the check valve and the solenoid valve is self-weighted. By draining from the air release valve, draining of the hot water controller can be completed.

  On the other hand, when the draining process of the hot water supply device is performed in a state where there is no negative pressure between the check valve and the electromagnetic valve, the air release valve is opened. Therefore, when the circulation pump is operated, the check valve is opened by negative pressure, and hot water between the check valve and the solenoid valve is sucked by the circulation pump with the inflow of air from the atmosphere release valve. Can be discharged.

  In the above-described hot water supply system of the present invention, the drain control means may start the operation of the circulation pump at least before opening the drain plug. Here, “at least before the opening of the drain plug” may be before the closing of the water supply plug, or between the closing of the water supply plug and the opening of the drain plug. Good.

  In this way, when the water heater is drained, regardless of whether or not a negative pressure is maintained between the check valve and the solenoid valve, the air release valve remains closed and the circulation pump operates. Since the check valve opens with negative pressure, the negative pressure of the circulation pump acts downstream of the solenoid valve. In this way, the air release valve is intentionally closed, and the solenoid valve is opened while the circulation pump continues to operate even after the drain plug is opened, so that the negative pressure of the circulation pump is increased upstream of the solenoid valve. Therefore, in addition to draining between the check valve and the solenoid valve as described above, draining on the upstream side of the solenoid valve can be completed.

  Further, in the bath hot water system of the present invention, the water drain control means starts the operation of the circulation pump triggered by the detection of the operation of the water drain switch operated when draining the water heater. Then, after the notification instructing the execution of the water draining step is performed, the solenoid valve may be opened while continuing the operation of the circulation pump.

  In this way, when the user operates the drain switch when draining the hot water supply apparatus, the operation of the circulation pump for draining water from the hot water controller and the opening of the solenoid valve are controlled. In addition, since the timing of executing the water draining process is notified, the user only needs to execute the water draining process of the hot water supply device (opening the water draining plug after closing the water supply main plug) according to the notification. It is possible to realize draining of the hot water controller.

  Further, in the bath hot water system of the present invention, the water drain control means starts the operation of the circulation pump triggered by the detection of the operation of the water drain switch operated when draining the water heater. After performing the water draining step, the solenoid valve may be opened while continuing the operation of the circulation pump.

  In this way, when the user operates the drain switch when draining the hot water supply device, a series of processes necessary for draining water from the hot water controller are automatically controlled. Therefore, it is possible to more easily realize draining of the hot water controller.

It is explanatory drawing which showed the whole structure of the bath hot-water supply system 1 of an Example. It is explanatory drawing which showed the internal structure of the hot water control apparatus 100 of a present Example. It is explanatory drawing which illustrated the case where the drainage of the hot water controller 100 cannot be performed after reheating. It is explanatory drawing which illustrated the hot water control apparatus 100 when the draining process of the hot water supply apparatus 10 was performed, without performing a reheating after stopping hot water filling. It is a flowchart which shows the system control process performed with the controller 50 of a present Example. 3 is an explanatory view showing a state in which the solenoid valve 103 is opened while the circulating pump 38 is operated when the hot water supply device 10 is drained to drain water from the hot water control device 100. FIG. It is a flowchart which shows the water draining control process performed with the controller 50 of a modification.

  FIG. 1 is an explanatory diagram showing the overall configuration of the bath hot water system 1 of the present embodiment. As shown in the figure, a hot water supply system 1 includes a hot water supply device 10 for generating hot water, a bath tub 2, a hot water supply pipe 20 for supplying hot water from the hot water supply device 10 to the bathtub 2, and a hot water supply pipe 20. A hot water tension control device 100 provided, a circulation pipe 30 for circulating the hot water in the bathtub 2 back to the hot water supply device 10, a controller 50 for controlling the operation of the bath hot water system 1 as a whole, and the like are provided. In addition, the bath hot water supply system 1 of a present Example has the reheating function which heats the hot water in the bathtub 2 again in addition to the hot water filling function which accumulates hot water in the bathtub 2. FIG. In this embodiment, the hot water supply pipe 20 corresponds to the “hot water supply passage” in the present invention.

  The hot water supply apparatus 10 includes a hot water supply burner 12 and a bath burner 13 that combust fuel gas, a combustion fan 11 that supplies combustion air to these burners, a hot water supply heat exchanger 14 provided above the hot water supply burner 12, A bath heat exchanger 15 provided above the bath burner 13 is provided. A gas pipe 7 for supplying fuel gas is branched into two and connected to a hot water supply burner 12 and a bath burner 13, and a hot water supply gas electromagnetic valve 8 and a bath gas electromagnetic valve 9 for opening and closing each branched pipe are provided. Yes. The combustion fan 11, the hot water supply electromagnetic valve 8, and the bath gas electromagnetic valve 9 are electrically connected to the controller 50.

  Hot water is supplied to the hot water supply heat exchanger 14 through the water supply pipe 3, and the supplied hot water is heated by the hot water supply heat exchanger 14 by heat exchange with the combustion exhaust of the hot water supply burner 12, and then hot water is supplied. And flows out to the hot water supply pipe 20. In the middle of the water supply pipe 3 connected to the hot water supply heat exchanger 14, a drain plug 4 for draining water from the hot water supply apparatus 10 is provided. Further, a water supply main plug 5 that opens and closes the water supply pipe 3 is provided on the upstream side of the water drain plug 4 of the water supply pipe 3. When the water heater 10 is drained, the user manually opens the water supply main plug 5. Close with to stop the water supply.

  The hot water supply pipe 20 connected to the downstream side of the hot water supply heat exchanger 14 is branched into two, one is connected to the hot water controller 100 and the other is provided with a drain plug 21 in the middle of the path and connected to the currant 22. It is connected. In addition, a hot water pressure pipe 6 branched from the water supply pipe 3 is connected to the hot water controller 100. Furthermore, the hot water controller 100 is electrically connected to the controller 50. The details of the hot water controller 100 will be described later with reference to another drawing.

  The circulation pipe 30 is a bath return pipe 32 that connects the circulation fitting 36 that opens to the bathtub 2 and the upstream side of the bath heat exchanger 15, and a bath that connects the downstream side of the bath heat exchanger 15 and the circulation fitting 36. A pipe 34 is provided, and a circulation pump 38 is provided in the bath return pipe 32. The circulation pump 38 is electrically connected to the controller 50, and the operation is controlled by the controller 50. When the circulation pump 38 is operated for reheating, hot water sucked out from the bathtub 2 is sent to the bath heat exchanger 15 through the bath return pipe 32. The hot water sent to the bath heat exchanger 15 is heated again by heat exchange with the combustion exhaust of the bath burner 13 and then supplied again to the bathtub 2 through the bath outlet pipe 34.

  The circulation pump 38 is connected to the hot water supply pipe 20 on the downstream side of the hot water controller 100. Hot water that has flowed out of the hot water supply heat exchanger 14 into the hot water supply pipe 20 during hot water filling is supplied to the bathtub 2 via the circulation pipe 30 (the bath outlet pipe 34 and the bath return pipe 32) when passing through the hot water control apparatus 100. .

  The controller 50 is electrically connected to the remote controller 52. The remote controller 52 is a display unit that can display a setting switch 53 for setting the amount and temperature of the hot water filling the bathtub 2, various switches such as the hot water filling switch 54 and the reheating switch 55, and the setting status. 56.

  FIG. 2 is an explanatory diagram showing the internal structure of the hot water controller 100 of this embodiment. As shown in the drawing, the hot water control device 100 of this embodiment includes an electromagnetic valve 103, a flow rate sensor 102, a filter 101, and two check valves (a first check valve 104 and a second check valve 105). And an atmosphere release valve 106 and the like. In addition, although the hot water control apparatus 100 of the present embodiment includes two check valves connected in series, it is not always necessary to include two check valves, and the upstream side (solenoid valve 103 side) is the first. The check valve 104 may be omitted. In the present embodiment, the second check valve 105 on the downstream side corresponds to the “check valve” of the present invention.

  The solenoid valve 103 can open and close the hot water supply pipe 20, and the controller 50 controls the opening and closing operation. The flow rate sensor 102 is provided upstream of the solenoid valve 103 (on the hot water supply device 10 side), detects the flow rate of hot water passing through the hot water supply pipe 20, and outputs it to the controller 50. Further, the filter 101 is provided on the upstream side of the flow rate sensor 102. By removing foreign matter mixed in the hot water from the hot water supply apparatus 10, the flow rate sensor 102 and the electromagnetic valve 103 are normal due to the biting of foreign matter. To prevent it from working.

  The first check valve 104 and the second check valve 105 are provided in series downstream of the electromagnetic valve 103 (tub 2 side). The structures of the first check valve 104 and the second check valve 105 are basically the same. The valve bodies 104a and 105a for opening and closing the hot water supply pipe 20 and the valve bodies 104a and 105a in the valve closing direction for closing the hot water supply pipe 20 are used. And valve closing springs 104b and 105b. When the solenoid valve 103 is opened, the pressure of the hot water supplied from the hot water supply device 10 rises, and when the pressure exceeds a predetermined valve opening pressure, the valve element 104a opens the hot water supply pipe 20 against the biasing force of the valve closing spring 104b. It moves in the valve opening direction, and the first check valve 104 is opened. Subsequently, the second check valve 105 similarly moves the valve body 105a in the valve opening direction against the urging force of the valve closing spring 105b, and enters the valve opening state, thereby allowing hot water to pass through the bathtub 2. Hot water filling is performed. On the other hand, when the pressure of the hot water supplied from the hot water supply device 10 is lower than the valve opening pressure due to water interruption during hot water filling, the valve bodies 104a and 105a are moved in the valve closing direction by the urging force of the valve closing springs 104b and 105b. Since the first check valve 104 and the second check valve 105 are closed by being pushed back, the back flow of hot water from the bathtub 2 side to the hot water supply device 10 side is prevented. The valve opening pressure of the check valves 104 and 105 is determined by the urging force of the valve closing springs 104b and 105b.

  The air release valve 106 connected between the first check valve 104 and the second check valve 105 is partitioned into a primary chamber 106a and a secondary chamber 106b by a valve body 106c supported by a diaphragm. It has a structure. Clean water is led to the primary chamber 106 a through the clean water pressure pipe 6. On the other hand, the secondary chamber 106b is provided with a valve opening spring 106d that guides hot water between the first check valve 104 and the second check valve 105 and biases the valve body 106c toward the primary chamber 106a. It has been. Usually, the pressure of clean water is higher than the pressure of hot water supplied between the first check valve 104 and the second check valve 105 via the hot water supply device 10. As a result of the valve body 106c being pushed toward the secondary chamber 106b against the urging force, the air release valve 106 is closed. However, when the pressure of clean water decreases due to a water shutoff or the like, the valve element 106c is pushed back to the primary chamber 106a side by the urging force of the valve opening spring 106d, and the air release valve 106 is opened. As a result, the hot water between the first check valve 104 and the second check valve 105 can be discharged from the atmosphere release valve 106, so that the first check valve 104 and the second check valve 105 are temporarily closed. Can be prevented from flowing back from the bathtub 2 side to the hot water supply device 10 side.

  In the hot water supply system 1 having the above-described configuration, the hot water supply device 10 is drained for the purpose of preventing breakage due to freezing and expansion of water in the pipe in winter, but the hot water control device 100 is drained. In particular, when water is drained after the circulation pump 38 is operated and replenished, water tends to remain in the hot water controller 100. Hereinafter, the reason why the hot water control apparatus 100 cannot drain water will be described.

  FIG. 3 is an explanatory view exemplifying a case where the hot water control apparatus 100 cannot drain water after reheating. First, FIG. 3 (a) shows a state in the hot water controller 100 during reheating. As described above, when the circulation pump 38 is operated for reheating, hot water in the bathtub 2 is sucked out and sent to the bath heat exchanger 15 through the bath return pipe 32. At this time, hot water in the hot water supply pipe 20 connected to the circulation pump 38 on the downstream side of the second check valve 105 is also sucked, so that a negative pressure lower than the atmospheric pressure is set on the downstream side of the second check valve 105. Occurs. When the difference between the negative pressure and the atmospheric pressure exceeds the difference between the valve opening pressure of the second check valve 105 and the atmospheric pressure, the valve body 105a is pulled downstream against the biasing force of the valve closing spring 105b. Thus, the second check valve 105 is opened. As a result, hot water is sucked between the first check valve 104 and the second check valve 105 and becomes negative pressure. Similarly, the first check valve 104 is also opened by the negative pressure on the downstream side, so that a negative pressure is generated between the electromagnetic valve 103 and the first check valve 104. The hatched portion in FIG. 3 represents a negative pressure. During reheating, the solenoid valve 103 is closed, so that the negative pressure due to the operation of the circulation pump 38 does not reach the hot water supply pipe 20 upstream of the solenoid valve 103.

  Thereafter, when the circulation pump 38 is stopped along with the completion of the reheating, hot water is not sucked on the downstream side of the hot water controller 100, so that the valve closing springs 104b and 105b are closed as shown in FIG. Due to the urging force, the valve bodies 104a and 105a are pushed back upstream, and the first check valve 104 and the second check valve 105 are closed. At this time, a negative pressure corresponding to the valve opening pressure of the check valves 104 and 105 (the biasing force of the valve closing springs 104b and 105b) is maintained between the solenoid valve 103 and the second check valve 105. It becomes.

  Then, in the state of FIG. 3B, when the user opens the drain plug 4 and the drain plug 21 (see FIG. 1) after closing the water supply main tap 5 for draining the hot water supply apparatus 10, Although the supply pressure of the clean water in the clean water pressure pipe 6 decreases, the valve body 106c is moved to the secondary chamber 106b side by the negative pressure held between the first check valve 104 and the second check valve 105. When the force drawn into the valve is larger than the urging force of the valve opening spring 106d, the atmosphere release valve 106 does not open and remains in the closed state. As a result, the hot water between the first check valve 104 and the second check valve 105 does not flow out from the atmosphere release valve 106 and remains.

  In addition, it is not limited to after draining the hot water control device 100, and even if the hot water control is not performed after stopping the hot water filling, the hot water control device 100 may not be drained. . As described above, the first check valve 104 and the second check valve 105 that have been opened due to hot water are opened when the solenoid valve 103 is closed and hot water supply is stopped. The valve returns to the closed state when the pressure falls below. At this time, the pressure between the solenoid valve 103 and the second check valve 105 is lower than the valve opening pressure of the first check valve 104 or the second check valve 105, but is a positive pressure higher than the atmospheric pressure. Kept. In this state, when the drain plug 4 and the drain plug 21 are opened after the water supply main tap 5 is closed as the draining process of the hot water supply device 10, the supply pressure of the clean water in the clean water pressure pipe 6 decreases. As shown in FIG. 4, the air release valve 106 is opened by the positive pressure between the first check valve 104 and the second check valve 105 and the urging force of the valve opening spring 106 d. Thereby, hot water between the first check valve 104 and the second check valve 105 can be discharged from the atmosphere release valve 106. However, since both the first check valve 104 and the second check valve 105 are closed, hot water between the first check valve 104 and the second check valve 105 flows out from the atmosphere release valve 106. In order to do so, it is necessary that replacement air also flows from the atmosphere release valve 106. Thus, even when the atmosphere release valve 106 is in the open state, it serves as both a hot water outlet and a replacement air inlet, and therefore the replacement check air 104 and the first check valve 104 The hot water between the second check valve 105 may remain without being removed.

  Further, as described above, the filter 101 is provided on the upstream side of the solenoid valve 103 of the hot water control apparatus 100, and the water draining process of the hot water supply apparatus 10 is performed (after the water supply main plug 5 is closed, the drain plug 4 is closed). And the drain plug 21 is opened), the hot water in the hot water supply pipe 20 upstream of the filter 101 is quickly discharged from the drain plug 4 and the drain plug 21, but between the filter 101 and the solenoid valve 103. There are times when the hot water will remain without being removed. This is because when the hot water on the upstream side of the solenoid valve 103 in the closed state tries to flow out through the filter 101, the replacement air needs to enter through the filter 101, and the This is because the surface tension of the air makes it difficult for air to pass through the filter 101.

  Therefore, in the bath hot water supply system 1 of the present embodiment, in order to enable draining of the hot water controller 10 as well as draining of the hot water heater 10, an electromagnetic valve is executed according to the following system control process executed by the controller 50. 103 is controlled and the operation and stop of the circulation pump 38 are controlled.

  FIG. 5 is a flowchart showing a system control process executed by the controller 50 of this embodiment. In the system control process, first, it is determined whether or not an operation of the hot water filling switch 54 of the remote controller 52 has been detected (STEP 100). As described above, the controller 50 is electrically connected to the remote controller 52. When the operation of the hot water filling switch 54 is detected (STEP 100: yes), the hot water supply burner 12 performs combustion in order to perform hot water filling. After starting (STEP 102), the solenoid valve 103 is opened (STEP 104). Then, since the first check valve 104 and the second check valve 105 are opened by the pressure of the hot water supplied from the hot water supply device 10, the hot water passes through the hot water control device 100 and is supplied to the bathtub 2. The

  Next, it is determined whether or not to stop filling (STEP 106). In the present embodiment, the stop condition of either the amount of hot water in the bathtub 2 reaching the amount of hot water set by the setting switch 53 of the remote controller 52 or whether the operation of the hot water filling switch 54 is detected again during the hot water filling is satisfied. To stop the filling. If none of the stop conditions is satisfied and the hot water filling is not stopped (STEP 106: no), the process waits until one of the stop conditions is satisfied and the hot water filling is stopped. When stopping hot water filling (STEP 106: yes), after stopping combustion in the hot water supply burner 12 (STEP 108), the solenoid valve 103 is closed (STEP 110). As a result, the supply of hot water from the hot water supply apparatus 10 is shut off, so that the first check valve 104 and the second check valve 105 are closed, and the electromagnetic valve 103 to the second check valve 105 as described above. Until then, positive pressure is maintained.

  On the other hand, if it is determined in STEP 100 that the operation of the hot water filling switch 54 is not detected (STEP 100: no), the processing in STEP 102 to STEP 110 is omitted, and then whether or not the operation of the reheating switch 55 of the remote controller 52 is detected. (STEP 112). If the operation of the reheating switch 55 is detected (STEP 112: yes), the circulation pump 38 is operated (STEP 114). Then, hot water is sucked out from the bathtub 2 and circulates in the circulation pipe 30, and hot water in the hot water supply pipe 20 is sucked in the downstream side of the second check valve 105 of the hot water controller 100 to generate negative pressure. . Next, it is determined whether or not an operation of the hot water filling switch 54 is detected (STEP 116). In this embodiment, the reheating switch 55 is operated by the user not only when reheating but also when draining the hot water supply device 10. When the hot water supply device 10 is draining, the reheating switch 55 Following the operation, the hot water filling switch 54 is operated.

  When the operation of the hot water filling switch 54 is not detected (STEP 116: no), combustion is started in the bath burner 13 in order to carry out reheating (STEP 118). Thereby, the hot and cold water sucked out from the bathtub 2 is heated again by the bath heat exchanger 15 and returned to the bathtub 2. Subsequently, it is determined whether or not to stop chasing (STEP 120). In this embodiment, the hot water temperature in the bathtub 2 reaches the hot water temperature set by the setting switch 53 of the remote controller 52, or the stop condition for either detecting the operation of the reheating switch 55 again during reheating. When is established, the chasing is stopped. If none of the stop conditions is satisfied and the chase is not stopped (STEP 120: no), the process waits until one of the stop conditions is met and the chase is stopped.

  When stopping the reheating (STEP 120: yes), after stopping the combustion in the bath burner 13 (STEP 122), the circulation pump 38 is stopped (STEP 124). Since the hot water in the hot water supply pipe 20 is not sucked downstream of the second check valve 105 due to the stop of the circulation pump 38, the first check valve 104 and the second check valve 105 that have been opened with a negative pressure are stopped. Is closed, and a negative pressure is maintained between the solenoid valve 103 and the second check valve 105.

  On the other hand, if it is determined in STEP 112 that the operation of the rework switch 55 is not detected (STEP 112: no), the processing in STEP 114 to STEP 124 is omitted, the process returns to the head of the system control processing, and the series of processing from STEP 100 onward is repeated. .

  If it is determined in STEP 116 that the operation of the hot water filling switch 54 is detected (STEP 116: yes), the hot water filling switch 54 is operated following the operation of the reheating switch 55 by the user when draining the hot water supply device 10. Therefore, the solenoid valve 103 is opened without starting combustion in either the bath burner 13 or the hot water supply burner 12 (STEP 126). In this embodiment, when the water heater 10 is drained, the user operates the hot water filling switch 54 following the operation of the hot water switch 55. However, the present invention is not limited to this. The switch 55 may be pressed long (for example, pressed for 5 seconds or more). Thus, by opening the solenoid valve 103 while the operation of the circulation pump 38 is continued, the hot water controller 10 and the hot water controller 100 can be drained together.

  FIG. 6 is an explanatory view showing a state in which the solenoid valve 103 is opened and water is drained from the hot water controller 100 while the circulation pump 38 is operated when the water heater 10 drains water. First, in FIG. 6A, the user performs a water draining process of the hot water supply apparatus 10 (opening the drain plug 4 and the drain plug 21 after closing the water supply main tap 5) from the state shown in FIG. 3B. After the operation, the case where the hot water filling switch 54 is operated subsequent to the operation of the chasing switch 55 is shown.

  As shown in FIG. 3B, the water draining process of the water heater 10 is performed in a state where the reheating is finished and the negative pressure is maintained between the first check valve 104 and the second check valve 105. However, the air release valve 106 may not open due to the negative pressure. If the circulation pump 38 is operated by operating the reheating switch 55 with the air release valve 106 closed, the hot water in the hot water supply pipe 20 is sucked into the downstream side of the second check valve 105 and becomes negative pressure. In addition, not only the second check valve 105 is opened but also the first check valve 104 is opened, so that the downstream side of the solenoid valve 103 has a negative pressure. Subsequently, when the solenoid valve 103 is opened by the operation of the hot water filling switch 54, the negative pressure due to the operation of the circulation pump 38 reaches the upstream side of the solenoid valve 103, and hot water remains between the filter 101 and the solenoid valve 103. If so, the hot water is sucked by the circulation pump 38. Furthermore, air opens from the upstream side of the filter 101 opened to the atmosphere by opening the drain plug 4 and the drain plug 21 and flows into the downstream side of the solenoid valve 103.

  Since the air flows in this way, the negative pressure between the first check valve 104 and the second check valve 105 is eliminated. Therefore, as shown in FIG. The valve is closed by the urging force of the valve closing spring 104b, and the air release valve 106 is opened by the urging force of the valve opening spring 106d. As a result, air can flow in from the atmosphere release valve 106, and hot water between the first check valve 104 and the second check valve 105 is sucked by the circulation pump 38. Can be completed.

  When the first check valve 104 is omitted, the suction of the circulation pump 38 is canceled by the air flowing in from the upstream side through the opened solenoid valve 103. Therefore, the first check valve 104 is omitted. And hot water between the first check valve 105 and the second check valve 105 are discharged from the opened air release valve 106.

  In addition, as shown in FIG. 4, when the user performs a draining process of the hot water supply device 10 without stopping after the hot water filling is stopped, the air release valve 106 is opened. Thereafter, when the hot water filling switch 54 is operated following the operation of the reheating switch 55, the second check valve 105 is opened by the negative pressure due to the operation of the circulation pump 38, and similarly to FIG. 6B. Since air can flow in from the open air release valve 106, hot water between the first check valve 104 and the second check valve 105 can be sucked and discharged by the circulation pump 38. .

  In the above, the example in which the reheating switch 55 is operated after the water draining process of the hot water supply apparatus 10 (the water draining plug 4 and the water draining plug 21 are opened after the water supply main tap 5 is closed) has been described. The timing of the operation of the switch 55 (operation of the circulation pump 38) is not limited to after the water draining process of the hot water supply device 10, but before the water supply main tap 5 is closed or after the water supply main tap 5 is closed. It may be until the stopper 21 is opened. If the circulation pump 38 is operated at least before the drain plug 4 and the drain plug 21 are opened, the atmosphere release valve 106 remains in the closed state regardless of whether or not it has been refueled. Since the second check valve 105 and the first check valve 104 are opened by the negative pressure due to the operation of the pump 38, the downstream side of the solenoid valve 103 has a negative pressure (see FIG. 3A). If the solenoid valve 103 is opened by operating the hot water filling switch 54 after opening the drain plug 4 and the drain plug 21 with the air release valve 106 intentionally closed in this way, FIG. Similarly to a), since the negative pressure due to the operation of the circulation pump 38 also reaches the upstream side of the electromagnetic valve 103, hot water from the filter 101 to the second check valve 105 can be sucked and discharged by the circulation pump 38. It becomes possible.

  In the system control process of FIG. 5, when the solenoid valve 103 is opened while the operation of the circulation pump 38 is continued (STEP 126), it is determined whether or not a predetermined time has elapsed (STEP 128), and the predetermined time has not elapsed. In such a case (STEP 128: no), the process waits until a predetermined time elapses. The predetermined time is set to a time sufficient for sucking hot water from the filter 101 to the second check valve 105 by the circulation pump 38 (for example, 1 minute). If the predetermined time has elapsed (STEP 128: yes), the circulation pump 38 is stopped (STEP 130), and then the electromagnetic valve 103 is closed (STEP 132). In addition, in the above-mentioned system control processing, the controller 50 of the present embodiment that executes processing for draining water from the hot water controller 100 (STEP 114, STEP 116, STEP 126 to STEP 132) is the “water drain control” in the present invention. Corresponds to “means”.

  The following modifications are also present in the bath hot water supply system 1 of this embodiment described above. In the following, modifications will be described focusing on differences from the above-described embodiment. In the description of the modified example, the same components as those in the above-described embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In the bath hot water supply system 1 of the above-described embodiment, processing for draining water from the hot water control device 100 (STEP 114, STEP 116 in FIG. 5) based on the detection of the operation of the reheating switch 55 and the hot water switch 54. , STEP 126 to STEP 132). However, a dedicated drain switch for draining water from the hot water controller 100 may be provided. In this case, when the operation of the drain switch is detected, a process for draining water from the hot water control device 100 (water drain control process) is performed separately from the hot water filling process and the chasing process. May be.

  FIG. 7 is a flowchart showing the water draining control process executed by the controller 50 of the modification. In the controller 50 of the modified example, the processing of STEP 116 and STEP 126 to STEP 132 is omitted from the system control processing (see FIG. 5) of the above-described embodiment. Moreover, the controller 50 of the modification which performs a drainage control process respond | corresponds to the "drainage control means" in this invention.

  As shown in FIG. 7, in the drain control process, first, it is determined whether or not an operation of a drain switch (not shown) provided in the remote controller 52 is detected (STEP 200). In the hot water supply system 1 of the modified example, when the water heater 10 drains water, the user operates the drain switch, and when the operation of the drain switch is not detected (STEP 200: no), the drain switch Wait until an operation is detected. When the operation of the drain switch is detected (STEP 200: yes), the circulation pump 38 is operated (STEP 202). At this time, the air release valve 106 is closed, and when the hot water in the hot water supply pipe 20 is sucked downstream of the second check valve 105 by the operation of the circulation pump 38 and negative pressure is generated, the second check valve is provided. Since the valve 105 and the first check valve 104 are opened, the downstream side of the electromagnetic valve 103 becomes negative pressure (see FIG. 3A).

  When the circulation pump 38 is operated in this way, the display unit 56 of the remote controller 52 displays a display instructing execution of the water draining process of the hot water supply apparatus 10 (opening the drain plug 4 and drain plug 21 after closing the water supply main tap 5). Perform (STEP 204). When the user performs the water draining process of the hot water supply device 10 according to this instruction, the supply pressure of the clean water in the clean water pressure pipe 6 decreases, but the first check valve 104 and the second check valve are operated by the operation of the circulation pump 38. Since the pressure between the valve 105 and the valve 105 is negative, the air release valve 106 remains closed by the negative pressure. Note that the manner of notification for instructing the execution of the water draining process is not limited to the display on the display unit 56, and for example, it may be output by sound from a speaker (not shown) provided in the remote controller 52 or the like.

  Following the notification for instructing the execution of the water draining process, it is determined whether or not an operation of a confirmation switch (not shown) provided on the remote controller 52 has been detected (STEP 206). In the bath water heating system 1 of the modified example, the user operates a confirmation switch indicating the completion of the water draining process after the water draining process of the water heater 10 is completed. When the operation of the confirmation switch is not detected (STEP 206: no), the process returns to the processing of STEP 204 and waits until the operation of the confirmation switch is detected while repeating the notification instructing the execution of the water draining process. Instead of providing a confirmation switch, a sensor that directly detects the execution of the water draining process of the hot water supply device 10 (closing of the water supply main tap 5, opening of the drain plug 4 or the drain plug 21) is provided. In STEP 206, it may be determined whether or not the execution of the water draining process is detected by this sensor.

  When the operation of the confirmation switch is detected (STEP 206: yes), the electromagnetic valve 103 is opened (STEP 208). As a result, the negative pressure due to the operation of the circulation pump 38 also reaches the upstream side of the electromagnetic valve 103, and the hot water between the filter 101 and the second check valve 105 circulates in the same manner as in the example described above with reference to FIG. Since suction is performed by the pump 38, draining of the hot water control device 100 can be completed.

  When the solenoid valve 103 is opened, it is determined whether or not a predetermined time has elapsed (STEP 210). If the predetermined time has not elapsed (STEP 210: no), the process waits until the predetermined time elapses. If the predetermined time has elapsed (STEP 210: yes), the circulation pump 38 is stopped (STEP 212), and then the solenoid valve 103 is closed (STEP 214). Wait until an operation is detected again.

  As described above, in the hot water supply system 1 of the modified example, when the user operates the drain switch when draining the hot water supply apparatus 10, the drain control process is started as a trigger. In this drainage control process, not only the operation of the circulation pump 38 for draining water from the hot water controller 100 and the opening of the electromagnetic valve 103 are controlled, but also the timing for executing the drainage process is notified. The user only needs to execute the draining process of the hot water supply device 10 according to the notification (display on the display unit 56), and the user can easily drain the hot water filling control device 100.

  As mentioned above, although the hot-water supply system 1 of a present Example and the modification was demonstrated, this invention is not restricted to said Example and a modification, It can implement in a various aspect in the range which does not deviate from the summary. Is possible.

  For example, in the above-described embodiments and modifications, the user manually opens the water supply tap 5 and opens the drain plug 4 and the drain plug 21, but the water supply tap 5, the drain plug 4 and the water Each of the taps 21 may be configured by an electromagnetic valve or the like, so that the water draining process of the hot water supply apparatus 10 may be automatically performed by the control of the controller 50 instead of manually by the user. In this case, in the drainage control process (FIG. 7) of the modified example described above, a draining process of the hot water supply apparatus 10 may be executed instead of STEP204 and STEP106. In this way, when the user operates the water drain switch, a series of processes necessary for draining water from the hot water controller 100 are automatically controlled in the water drain control process started when the user operates the water drain switch. It becomes possible for the user to realize drainage of the hot water controller more easily.

  In the above-described modification, the circulation pump 38 is operated prior to the water draining process of the hot water supply device 10. However, the operation timing of the circulation pump 38 is not limited to this, and at least the solenoid valve 103 is opened. If it is before.

1 ... Bath hot water system, 2 ... Bathtub, 3 ... Water supply piping,
4 ... Drain plug, 5 ... Water supply main plug, 6 ... Water pressure piping,
7 ... Gas piping, 8 ... Hot water gas solenoid valve, 9 ... Bath gas solenoid valve,
10 ... Hot-water supply device, 11 ... Combustion fan, 12 ... Hot-water supply burner,
13 ... Bath burner, 14 ... Hot-water heat exchanger, 15 ... Bath heat exchanger,
20 ... Hot water supply pipes, 21 ... Drain plugs, 22 ... Karan,
30 ... circulation piping, 32 ... bath return piping, 34 ... bath-out piping,
36 ... circulation fittings, 38 ... circulation pump, 50 ... controller,
52 ... Remote control, 53 ... Setting switch, 54 ... Hot water filling switch,
55 ... reheating switch 56 ... display unit 100 ... hot water controller 101 ... filter 102 ... flow sensor 103 ... solenoid valve
104: first check valve, 105: second check valve, 106: air release valve.

Claims (4)

A hot water control device provided in a hot water supply passage for supplying hot water to the bathtub from the hot water supply device controls the hot water filling of the bathtub, and a circulation pump connected between the bathtub and the hot water control device. In the bath hot water system that can suck out and circulate hot water in the bathtub by operating,
The hot water controller is
An electromagnetic valve for opening and closing the hot water supply passage;
The solenoid valve is provided closer to the bathtub than the solenoid valve and is urged in the valve closing direction to close the hot water supply passage, and opens when the pressure of the hot water on the solenoid valve side exceeds a predetermined valve opening pressure. A stop valve,
Upon receiving the pressure of clean water supplied to the hot water supply device, the valve closes against the urging force of the valve opening spring, and when the pressure of the clean water drops, the check valve and the solenoid valve are opened. And an air release valve that can discharge hot water between
After the water supply main tap for stopping the supply of clean water to the hot water supply device is closed, after the water draining step for opening the drain tap for draining water from the hot water supply device is performed, and the circulation In a state where the operation of the pump is continued, a drainage control means for opening the solenoid valve is provided,
The water draining control unit starts the operation of the circulation pump at least before the opening of the electromagnetic valve. In the bath hot water system according to claim 1,
The water supply control means starts the operation of the circulation pump at least before the opening of the drain plug. In the bath hot water supply system according to claim 1 or 2,
The drainage control means starts the operation of the circulation pump when an operation of a drainage switch operated when draining the hot water supply device is detected, and then instructs execution of the draining step. After performing the notification, the bath water heating system is characterized in that the solenoid valve is opened while continuing the operation of the circulation pump. In the bath hot water supply system according to claim 1 or 2,
The drainage control means starts the operation of the circulation pump triggered by the detection of the operation of the drainage switch operated when draining the hot water supply device, and subsequently executes the draining step. The bath water supply system is characterized in that the solenoid valve is opened while the operation of the circulation pump is continued.

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