JP6393654B2 - Hot water controller - Google Patents

Description

  The present invention relates to a system in which a circulating pump that draws hot water from a hot water supply device through a hot water control device and circulates the hot water in the bathtub is connected between the bathtub and the hot water control device. Relates to a technique for draining water from the hot water controller when draining the hot water supply device.

  In a system that fills a bathtub with hot water generated by a hot water supply device, a hot water control device is provided in a hot water supply passage for supplying hot water from the hot water supply device to the bathtub. This hot water controller is composed of an electromagnetic valve, 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 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 interruption during hot water filling and the pressure of hot water supplied from the hot water supply device decreases. The inside sewage is prevented from flowing back to the hot water supply apparatus through the hot water supply 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 the valve opening spring, and is closed against the urging force of the valve opening spring by receiving the supply pressure of clean water. And if the supply pressure of clean water falls, an air release valve will open with the urging | biasing force of a valve-opening spring, and the hot water between a non-return valve and an electromagnetic valve will be discharged | emitted. Therefore, even when the check valve is incompletely closed for some reason, it is possible to prevent sewage from flowing backward from the bathtub side to the hot water supply device side. In addition, the air release valve opens when the hot water supply device is drained and the supply water supply is closed and the supply of clean water is stopped. Water can be drained.

  Furthermore, in such a hot water control device, a circulation pump that draws out hot water from the bathtub and circulates it may be connected between the bathtub and the check valve for replenishing hot water in the bathtub. (For example, patent document 2).

JP 2009-270698 A JP 2008-298109 A

  However, in the hot water control device in which the circulation pump is connected to the downstream side (tub side) of the check valve, water cannot be drained between the check valve and the solenoid valve even after draining the hot water supply device. There was a problem that there was. This is due to the following reason. First, as the circulation pump is operated to draw hot water from the bathtub, negative pressure is generated on the downstream side of the check valve of the hot water controller. When the difference between the negative pressure and the atmospheric pressure exceeds the difference between the opening pressure of the check valve and the atmospheric pressure, the check valve is opened, and a negative pressure is generated between the check valve and the electromagnetic valve. When the circulation pump stops operating, the check valve is closed, and the negative pressure is maintained between the check valve and the electromagnetic valve. When the force that attracts the air release valve to the valve closing side by this negative pressure is stronger than the biasing force of the valve opening spring, the water supply main valve is closed when draining the hot water supply device, and the supply of clean water is stopped. Even if this is done, the air release valve does not open, so the water between the check valve and the solenoid valve remains without being removed.

  The present invention has been made in response to the above-described problems in the prior art, and provides a technique by which a circulation pump can easily drain water from a hot water controller connected to the downstream side of the check valve. With the goal.

In order to solve the above-described problems, the first hot water controller of the present invention employs the following configuration. That is,
Provided in a hot water supply passage for supplying hot water from a hot water supply device to the bathtub, an electromagnetic valve for opening and closing the hot water supply passage to control the filling of the bathtub, and provided on the bathtub side of the electromagnetic valve, A check valve that 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, and water supply to the hot water supply device An air release valve that closes against the biasing force of the valve opening spring by pressure, and that opens when the pressure of the clean water decreases and discharges hot water between the check valve and the solenoid valve; A hot water tension control device in which a circulation pump for sucking and circulating hot water from the bathtub when the hot water in the bathtub is recirculated is connected between the bathtub and the check valve;
The solenoid valve, said regardless of whether the water draining of the water heater is performed, when the circulation pump operates to circulate the hot water in said bathtub in the reheating is stopped, the predetermined time opening and wherein the passing the hot water from the previous SL water heater.

In the first hot water control apparatus of the present invention, not only the solenoid valve is opened to fill the bathtub, but also the circulation pump that is operated to circulate the hot water in the bathtub is stopped. Later, the negative pressure between the check valve and the solenoid valve caused by the suction of the circulation pump can be eliminated by opening the solenoid valve for a predetermined time and allowing hot water from the hot water supply device to pass through. If the negative pressure is eliminated in this way, even after the reheating ( circulation of the hot water in the bathtub by the circulation pump ) is performed, the water supply tap is closed when the hot water supply device is drained. When the water supply pressure decreases, the air release valve opens, so that water between the check valve and the electromagnetic valve can be easily discharged from the air release valve.

In order to solve the above-described problems, the second hot water control apparatus of the present invention employs the following configuration. That is,
Provided in a hot water supply passage for supplying hot water from a hot water supply device to the bathtub, an electromagnetic valve for opening and closing the hot water supply passage to control the filling of the bathtub, and provided on the bathtub side of the electromagnetic valve, A check valve that 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, and water supply to the hot water supply device An air release valve that closes against the biasing force of the valve opening spring by pressure, and that opens when the pressure of the clean water decreases and discharges hot water between the check valve and the solenoid valve; A hot water control apparatus in which a circulation pump for sucking out and circulating hot water in the bathtub is connected between the bathtub and the check valve;
The solenoid valve is opened when the operation of the drain switch operated when draining the hot water supply device is detected after the operation of the circulation pump is stopped, and the hot water from the hot water supply device is discharged. Let through
It is characterized by that.

In such a second hot water control device of the present invention, it is not necessary to open the solenoid valve every time hot water circulation by the circulation pump is completed, and the operation of the drain switch is stopped after the operation of the circulation pump is stopped. Since it is only necessary to open the solenoid valve when it is detected, water drainage between the check valve and the solenoid valve can be realized more easily.

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 showed the mode of draining from the hot water control apparatus. It is explanatory drawing which illustrated the case where the drain in the hot water controller 100 cannot be performed. 3 is a flowchart showing a solenoid valve control process executed by a controller 50.

  FIG. 1 is an explanatory diagram showing an overall configuration of a bath hot water supply system 1 including a hot water controller 100 according to 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 and a circulation pipe 30 for circulating the hot water in the bathtub 2 back to the hot water supply device 10 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 6 for supplying fuel gas is branched into two and connected to a hot water supply burner 12 and a bath burner 13. A hot water supply gas electromagnetic valve 7 and a bath gas electromagnetic valve 8 for opening and closing each branched pipe are provided. Yes.

  Hot water is supplied to the hot water supply heat exchanger 14 through the water supply pipe 4, and the supplied hot water is heated by the hot water supply heat exchanger 14 by heat exchange with the combustion exhaust gas 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 4 connected to the hot water supply heat exchanger 14, a water drain plug 3 for draining water from the hot water supply apparatus 10 is provided. Further, a water supply main plug 4a for opening and closing the water supply pipe 4 is provided on the upstream side of the water drain plug 3 of the water supply pipe 4, and when the water heater 10 is drained, the water supply main plug 4a is manually closed. Stop supplying water.

  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 water drain plug 21 in the middle of the path and connected to the currant 22. Has been. In addition, a hot water pressure pipe 5 branched from the water supply pipe 4 is connected to the hot water controller 100. Furthermore, the hot water controller 100 is electrically connected to a controller 50 that controls the bath hot water system 1. 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. The pipe 34 is configured. The bath return pipe 32 is provided with a circulation pump 38, and the circulation pump 38 is electrically connected to 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. The 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 hot water control pipe 100 and the bath return pipe 34 and the bath return pipe 32.

  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. The situation where it doesn't work is prevented.

  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 5. 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, and the valve opening spring 106d is attached. As a result of the valve body 106c being pushed toward the secondary chamber 106b against the 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, hot water between the first check valve 104 and the second check valve 105 is discharged, so that the first check valve 104 and the second check valve 105 are not completely closed. Even in this case, the back flow of hot water from the bathtub 2 side to the hot water supply device 10 side can be prevented.

  In the hot water controller 100 of the present embodiment as described above, when the hot water supply device 10 is drained in order to prevent damage due to freezing and expansion of water in the pipe in winter, the hot water controller is associated therewith. The water in 100 can be drained. FIG. 3 is an explanatory view showing a state of draining water from the hot water controller 100. First, FIG. 3A shows a state before draining, and in the illustrated example, the hot water filling is stopped by closing the electromagnetic valve 103. When the solenoid valve 103 is closed, hot water from the hot water supply device 10 is not supplied downstream of the solenoid valve 103, so that the pressure of the hot water decreases and falls below the valve opening pressure, so that the first check valve 104 and the second check valve 104 The check valve 105 is closed. 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. Further, the atmospheric release valve 106 is configured so that 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 are generated by the pressure of the clean water supplied through the clean water pressure pipe 5. The valve is closed against this.

  When draining water from the hot water supply apparatus 10, the water supply tap 4a of the water supply pipe 4 is closed to stop the supply of clean water, and then the water drain plug 3 and the water drain plug 21 (see FIG. 1) are opened. Then, since the water in the water pressure pipe 5 is discharged from the water drain plug 3 and the pressure is lowered, as shown in FIG. 3B, the air release valve 106 includes the first check valve 104 and the second check valve 104. The valve is opened by the positive pressure between the check valve 105 and the biasing force of the valve opening spring 106d. As a result, water between the first check valve 104 and the second check valve 105 is discharged from the atmosphere release valve 106. At this time, in this embodiment, water remains between the solenoid valve 103 and the first check valve 104. However, when the water expands when the water freezes, the first check valve 104 is caused by the pressure. Since the valve is opened and water is discharged from the air release valve 106 as a result, the hot water controller 100 is not damaged. Further, when an operation of a drain switch (not shown) that is operated when draining the hot water supply device 10 is detected, the water between the solenoid valve 103 and the first check valve 104 is drained by opening the solenoid valve 103. It may be discharged from the stopper 21. When the first check valve 104 is omitted, when the atmosphere release valve 106 is opened, water between the electromagnetic valve 103 and the second check valve 105 is quickly discharged from the atmosphere release valve 106. The

  However, in the case where the recirculation pump 38 is operated after the hot water filling is stopped and the reheating is performed, the water in the hot water control device 100 cannot be drained even if the hot water supply device 10 is similarly drained. There is. FIG. 4 is an explanatory view exemplifying a case where drainage in the hot water controller 100 cannot be performed. First, FIG. 4 (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. 4 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 operation of 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 as shown in FIG. The valve bodies 104a and 105a are pushed back upstream by the urging force of 105b, 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.

  In the state of FIG. 4B, even if the supply pressure of the clean water in the clean water pressure pipe 5 decreases as the water supply main plug 4a is closed to drain the hot water supply device 10, the first reverse When the force that pulls the valve body 106c toward the secondary chamber 106b due to the negative pressure held between the stop valve 104 and the second check valve 105 is greater than the urging force of the valve opening spring 106d, the air release valve 106 does not open and remains closed. As a result, water between the first check valve 104 and the second check valve 105 remains without being discharged. Therefore, in the hot water control apparatus 100 of the present embodiment, the controller 50 uses the controller 50 to allow the water to be drained between the first check valve 104 and the second check valve 105 even when reheating is performed. The electromagnetic valve 103 is opened and closed according to the following electromagnetic valve control process to be executed.

  FIG. 5 is a flowchart showing a solenoid valve control process executed by the controller 50. In the electromagnetic valve control process, first, it is determined whether or not to fill water (STEP 100). This determination is made based on an operation of a hot water filling switch (not shown) connected to the controller 50. If an operation of the hot water filling switch is detected, the hot water filling is executed. If an operation of the hot water filling switch is not detected, the hot water filling switch is executed. Do not perform tension.

  And when hot water filling is performed (STEP 100: yes), the solenoid valve 103 is opened (STEP 102). Then, as described above, 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, so that the hot water is passed through and the hot water is filled in the bathtub 2. Is called.

  Subsequently, it is determined whether or not the hot water filling is stopped (STEP 104). In this embodiment, the hot water filling is stopped when the stop condition of either the hot water amount in the bathtub 2 reaching the set hot water amount or the operation of the hot water filling switch is detected during the hot water filling. If none of the stop conditions are satisfied and the hot water filling is not stopped (STEP 104: no), the process waits until one of the stop conditions is satisfied and the hot water filling is stopped. When the hot water filling is stopped (STEP 104: yes), the electromagnetic valve 103 is closed (STEP 106). As a result, the supply of hot water from the hot water supply apparatus 10 is shut off, and as described above with reference to FIG. 3A, the first check valve 104 and the second check valve 105 are closed, and the electromagnetic The pressure between the valve 103 and the second check valve 105 is kept at a positive pressure.

  On the other hand, if it is determined in STEP 100 that no hot water filling is performed (STEP 100: no), the processing in STEP 102 to STEP 106 is omitted, and then it is determined whether or not it is after the end of reheating (STEP 108). As described above, the controller 50 is connected to the circulation pump 38, and if the circulation pump 38 is stopped after being operated, it is determined that the refueling is finished, and the circulation pump 38 is not operated. Alternatively, if the circulation pump 38 is in operation, it is determined that it is not after the end of the chasing.

  If it is after the end of reheating (STEP 108: yes), the electromagnetic valve 103 is opened (STEP 110). As described above with reference to FIG. 4B, after the replenishment is finished (after the operation of the circulation pump 38 is stopped), the negative pressure remains between the solenoid valve 103 and the second check valve 105. Since the solenoid valve 103 is opened, hot water is supplied from the hot water supply device 10, so that the negative pressure between the solenoid valve 103 and the second check valve 105 can be eliminated.

  When the electromagnetic valve 103 is opened, it is determined whether or not a predetermined time has elapsed (STEP 112). If the predetermined time has not elapsed (STEP 112: no), the process waits until the predetermined time elapses. The predetermined time is set to a time (for example, 1 second) sufficient to eliminate the negative pressure between the solenoid valve 103 and the second check valve 105 by supplying hot water from the hot water supply device 10. When the predetermined time has elapsed (STEP 112: yes), the electromagnetic valve 103 is closed (STEP 114). Thereby, it will be in the same state as after the hot water filling shown in FIG.

  On the other hand, if the determination in STEP 108 is not after the end of replenishment (STEP 108: no), it is not necessary to eliminate the negative pressure due to the operation of the circulation pump 38, so the processing in STEP 110 to STEP 114 is omitted and the solenoid valve control is performed. Returning to the top of the process, the series of processes described above is repeated.

  As described above, in the hot water control apparatus 100 of the present embodiment, not only the electromagnetic valve 103 is opened to fill the bathtub 2 but also the recirculation pump 38 is stopped and the operation of the circulation pump 38 is stopped. After that, the negative pressure between the electromagnetic valve 103 and the second check valve 105 generated by the suction of the circulation pump 38 is obtained by opening the electromagnetic valve 103 for a predetermined time and supplying hot water from the hot water supply device 10. Is supposed to be resolved. If the negative pressure is eliminated in this way, even after the reheating, if the supply pressure of clean water decreases as the water supply main plug 4a is closed when draining the hot water supply apparatus 10, Since the release valve 106 is opened by the urging force of the valve opening spring 106d, water between the first check valve 104 and the second check valve 105 can be discharged from the atmosphere release valve 106. .

  There are also the following modifications in the hot water controller 100 of the present embodiment described above. In the following, modifications will be described focusing on differences from the above-described embodiment.

  In the above-described hot water controller 100, the solenoid valve 103 is opened each time after the reheating is finished (after the operation of the circulation pump 38 is stopped), so that the solenoid valve 103 to the second check valve 105 can be opened. The negative pressure in between was to be canceled. However, the opening of the solenoid valve 103 (removal of the negative pressure) after the reheating is not necessarily performed every time, and the negative pressure is eliminated at least when the hot water controller 100 is drained. Just do it.

  The bath hot-water supply system 1 including the hot-water supply control device 100 according to the modified example is provided with a water drain switch (not shown) that is operated when the hot water supply device 10 drains water. The electromagnetic valve 103 according to the modified example is a drain switch. The valve is opened when an operation is detected. In order to realize such control of the solenoid valve 103, in the solenoid valve control processing (see FIG. 5), in the judgment of STEP 108, when it is after the end of reheating (STEP 108: yes), subsequently, the drain switch It is determined whether an operation has been detected. When the operation of the drain switch is detected, the solenoid valve 103 is closed after a predetermined time has elapsed after opening the solenoid valve 103 (STEP 110 to STEP 114). On the other hand, when the operation of the water drain switch is not detected, the processing of STEP 110 to STEP 114 is omitted and the processing returns to the head of the electromagnetic valve control processing.

  In the hot water control apparatus 100 of such a modification, it is not necessary to open the solenoid valve 103 every time when reheating is completed, and only when the operation of the drain switch is detected after the reheating is completed. Therefore, draining between the first check valve 104 and the second check valve 105 can be realized more easily.

  As mentioned above, although the hot water filling control apparatus 100 of a present Example and the modification was demonstrated, this invention is not limited to said Example and a modification, It implements in a various aspect in the range which does not deviate from the summary. Is possible.

  For example, in the above-described embodiment and modification, the circulation pump 38 is operated for reheating, but the operation of the circulation pump 38 is not limited to reheating. For example, the circulation pump 38 may be operated as an anti-freezing operation for preventing freezing of water in the circulation pipe 30 in winter. In this case, when the anti-freezing operation is completed, the second check from the solenoid valve 103 is performed. The negative pressure remains until the valve 105 is reached. Therefore, if the negative pressure between the solenoid valve 103 and the second check valve 105 is eliminated by opening the solenoid valve 103 after the freeze prevention operation is completed, the freeze prevention operation is performed. However, it is possible to drain water between the first check valve 104 and the second check valve 105 as the water heater 10 drains water.

1 ... Bath hot water system, 2 ... Bathtub, 3 ... Water drain,
4 ... Water supply piping, 4a ... Water supply main plug, 5 ... Water pressure piping,
6 ... Gas piping, 7 ... Hot water supply gas solenoid valve, 8 ... 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 ... Water taps, 22 ... Karan,
30 ... circulation piping, 32 ... bath return piping, 34 ... bath-out piping,
36 ... circulation fittings, 38 ... circulation pump, 50 ... controller,
100 ... Hot water tension control device, 101 ... Filter, 102 ... Flow rate sensor,
103 ... Solenoid valve, 104 ... First check valve, 105 ... Second check valve,
106 ... Air release valve.

Claims (2)

Provided in a hot water supply passage for supplying hot water from a hot water supply device to the bathtub, an electromagnetic valve for opening and closing the hot water supply passage to control the filling of the bathtub, and provided on the bathtub side of the electromagnetic valve, A check valve that 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, and water supply to the hot water supply device An air release valve that closes against the biasing force of the valve opening spring by pressure, and that opens when the pressure of the clean water decreases and discharges hot water between the check valve and the solenoid valve; A hot water tension control device in which a circulation pump for sucking and circulating hot water from the bathtub when the hot water in the bathtub is recirculated is connected between the bathtub and the check valve;
The solenoid valve, said regardless of whether the water draining of the water heater is performed, when the circulation pump operates to circulate the hot water in said bathtub in the reheating is stopped, the predetermined time opening YuCho control apparatus characterized by passing hot water from the previous SL water heater. Provided in a hot water supply passage for supplying hot water from a hot water supply device to the bathtub, an electromagnetic valve for opening and closing the hot water supply passage to control the filling of the bathtub, and provided on the bathtub side of the electromagnetic valve, A check valve that 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, and water supply to the hot water supply device An air release valve that closes against the biasing force of the valve opening spring by pressure, and that opens when the pressure of the clean water decreases and discharges hot water between the check valve and the solenoid valve; A hot water control apparatus in which a circulation pump for sucking out and circulating hot water in the bathtub is connected between the bathtub and the check valve;
The solenoid valve is opened when the operation of the drain switch operated when draining the hot water supply device is detected after the operation of the circulation pump is stopped, and the hot water from the hot water supply device is discharged. A hot water control device characterized by passing through.

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