JP2010078178A - Hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply device capable of providing clean bathing by automatically replacing hot water in a bathtub. <P>SOLUTION: This hot water supply device H supplies the warm water in a hot water storage tank 20 having a prescribed temperature adjusted by a mixing valve 70 to the bathtub 60 through a secondary flow channel 55 as a reheating circuit, and can perform a reheating operation by heating the bathtub water in the bathtub 60 sucked from a bathtub returning pipe 58 by circulating the bathtub water to a heat exchanger 50 for reheating by operating a pump (pump for reheating) 56, and returning the bathtub water into the bathtub 60 from a bathtub going pipe 58. A draining device 100 is connected to a secondary circuit 55 between a discharge side of the pump 56 and a connecting section of the mixing valve 70, so that the bathtub water in the bathtub 60 is sucked from the bathtub returning pipe 58 by operating the pump 56, and discharged from the draining device 100. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hot water supply apparatus capable of performing a reheating operation after circulating bath water in a bathtub through a heat exchanger for reheating by heating a pump, and then returning the heat to the bath.

  Conventionally, this type of hot water supply device, for example, a heat pump type hot water supply device, includes a hot water storage tank capable of storing hot water, and a heat pump refrigerant circuit having a compressor, a heat exchanger, and an evaporator, from the lower part of the hot water storage tank. After taking out the low temperature water (or cold water) and flowing it to the heat exchanger of the heat pump refrigerant circuit, heat exchange with the high temperature refrigerant flowing through the heat exchanger and heating it to high temperature water, return it to the upper part of the hot water storage tank, It was stored in the hot water storage tank.

By the way, in such a hot-water supply apparatus, the reheating function for maintaining the bathtub water in a bathtub at appropriate temperature, or heating the bathtub water in the cooled bathtub is comprised. Specifically, referring to FIG. 3, the hot water supply apparatus includes a reheating circuit 55 having a pump 56, a reheating heat exchanger 50, a forward piping 57 and a return piping 58 of the bathtub 60. . Then, the bath water in the bathtub sucked from the bathtub return pipe 58 by the operation of the pump 56 is circulated to the heat exchanger 50 for heating and heated, and then returned from the bathtub return pipe 57 into the bathtub 60 ( For example, see Patent Document 1).
JP 2006-138513 A

  By the way, in the hot water supply apparatus having such a reheating function, it is possible to maintain the bath water in the bathtub at an appropriate temperature by the reheating operation as described above. Since it is also suitable temperature, if it is drained from the tub regularly and the tub water in the tub is replaced, it may become a hotbed for breeding bacteria. However, in the conventional hot water supply apparatus, the discharge of the bathtub water in the bathtub was only from the drain outlet provided in the bottom of the bathtub. In other words, since the drainage of the bathtub water in the bathtub is dependent on the user, there is a possibility that it may not be drained for days. In particular, the circuit for reheating is equipped with a filter for preventing malfunction of the equipment, and by circulating the bathtub water in the bathtub to the reheating circuit, visible dusts are removed by the filter. In many cases, the user misunderstood that the water was clean and the bath water was not replaced for a long time.

  In this way, if the bath water is used repeatedly without being replaced, the bacteria will propagate in the bath water, and the bacteria will bathe in the propagated bath water. There was a problem that there was a high possibility of appearing.

  This invention is made in order to eliminate the conventional technical problem which concerns, and provides the hot-water supply apparatus which can replace the bathtub water in a bathtub automatically, without going through artificial operation. With the goal.

  The hot water supply apparatus of the present invention includes a hot water storage tank for storing hot water, a reheating pump, a reheating heat exchanger, a reheating circuit having a bathtub return pipe and a bathtub return pipe, and a discharge side of the reheating pump. And a mixing valve piped to a heating circuit between the heating heat exchanger and the hot water in the hot water storage tank set at a predetermined temperature by the mixing valve to the bathtub through the heating circuit Supplying and heating the tub water in the tub drawn from the tub return pipe by circulating the tub pump to the heat exchanger for heating and then returning it to the tub from the tub outlet pipe is possible. And a drainage device connected to a circuit for heating between the discharge side of the pump for pumping and the connecting portion of the mixing valve, and the bathtub return pipe by operating the pump for pumping The bathtub water in the bathtub can be sucked out and discharged from the drainage device. It is characterized in that is.

  According to a second aspect of the present invention, there is provided a hot water supply apparatus according to the above-mentioned invention, wherein the drainage device comprises a flow path switching valve interposed in the reheating circuit and communicated with the drainage port. By switching the flow path so that the discharge side communicates with the drain outlet, the bathtub water in the bathtub is discharged from the drain outlet.

  The hot water supply apparatus of the invention of claim 3 switches the flow path so that the discharge side of the reheating pump communicates with the drainage port by the flow path switching valve in the invention of any one of claims 1 to 3. Perform washing operation by pouring hot water from the mixing valve through the heat exchanger for reheating to the bathtub from the piping going out of the bathtub, and operating the reheating pump to discharge the bathtub water in the bathtub from the drain outlet. It is characterized by.

  A hot water supply apparatus according to a fourth aspect of the present invention provides a hot water supply apparatus according to any one of the first to third aspects of the present invention, in which the drainage device is used to perform a chasing operation using the chasing circuit. It is characterized by discharging some water.

  A hot water supply apparatus according to a fifth aspect of the present invention is the hot water supply apparatus according to any one of the first to fourth aspects of the present invention, or before the antifreezing operation is performed by circulating the bathtub water in the bathtub or the antifreezing operation. During the operation, a part of the bathtub water in the bathtub is discharged by the drainage device and poured into the bathtub from the mixing valve via the reheating circuit.

  A hot water supply apparatus according to a sixth aspect of the present invention is a hot water storage system comprising a heat pump refrigerant circuit having a compressor, a refrigerant-to-water heat exchanger, and an evaporator according to any of the first to fifth aspects. Hot water is generated in the tank.

  A hot water supply apparatus according to a seventh aspect of the present invention executes the hot water for pouring hot water in the hot water storage tank into the bathtub after partially discharging the bathtub water in the bathtub by the drainage device in the invention of the second aspect. It is characterized by.

  According to the present invention, a hot water storage tank for storing hot water, a reheating pump, a reheating heat exchanger, a reheating circuit having a bathtub return pipe and a bathtub return pipe, a discharge side of the reheating pump, And a mixing valve connected to a circuit for heating between the heat exchangers for heating, and the hot water in the hot water storage tank, which is set to a predetermined temperature by the mixing valve, is supplied to the bathtub through the circuit for heating. In addition, after the bath water in the bathtub sucked from the bathtub return pipe is circulated to the heat exchanger for heating after the pump is operated by the operation of the pump, it can be returned to the bathtub from the bathtub return pipe. And a drainage device connected to a reheating circuit between the discharge side of the reheating pump and the connecting portion of the mixing valve. The bathtub water inside can be sucked and discharged from the drainage device. Since the, it is possible to discharge the bath water in the bathtub by the drainage device. In particular, by connecting the drainage device to the chase circuit and constructing the bath water in the tub so that it can be sucked and discharged by operating the chase pump, suction means for sucking the tub water from the tub is provided. Since the bathtub water can be discharged without providing it separately, the cost increase can be suppressed as much as possible.

  According to a second aspect of the present invention, the drainage device comprises a flow path switching valve that is interposed in the reheating circuit and communicated with the drainage port, and the discharge side of the remediation pump communicates with the drainage port by the flow path switching valve. If the bath water in the bathtub is discharged from the drain port by switching the flow path, the bathtub water in the bathtub can be easily discharged with a simple configuration.

  Thus, the bathtub water in the bathtub can be automatically discharged without depending on the bathtub water discharging operation by the user.

  According to a third aspect of the invention, in the invention according to any one of the first to third aspects, the flow path is switched by the flow path switching valve so that the discharge side of the reheating pump communicates with the drain port. In addition to pouring hot water from the mixing valve through the heat exchanger for reheating to the bathtub from the piping going out of the bathtub, the cleaning operation is performed by operating the reheating pump and discharging the bathtub water in the bathtub from the drain outlet. be able to. By this washing operation, the inside of each pipe and the bathtub can be kept hygienic.

  According to invention of Claim 4, before performing the chasing operation | movement using the circuit for chasing in the invention in any one of Claim 1 thru | or 3, it is bath water in a bathtub by a drainage device. As the hot water of hot water from the hot water storage tank can be newly supplied into the bathtub, the time for the chasing operation can be shortened. It can be suppressed as much as possible. As a result, the efficiency of the hot water supply apparatus can be improved.

  According to the invention of claim 5, before the antifreezing operation is performed by circulating the bathtub water in the bathtub in the invention of any one of claims 1 to 4, or the antifreezing operation is performed. During the run, the drainage device drains a part of the bath water in the bath and pours it into the bath through the circuit for reheating from the mixing valve, allowing more hot water to flow from the hot water storage tank. It becomes.

  According to a sixth aspect of the present invention, a hot water storage tank comprises a heat pump refrigerant circuit comprising the compressor, the refrigerant-to-water heat exchanger, and the evaporator according to any of the first to fifth aspects. Since the hot water is generated inside, the energy efficiency is higher than that in the case where the hot water is generated in the hot water storage tank by the electric heater, and energy saving can be realized.

  According to the invention of claim 7, in the invention of claim 2, since the bathtub water in the bathtub is partially discharged by the drainage device, the hot water for pouring hot water in the hot water storage tank into the bathtub is executed. For example, when adjusting the water level in the bathtub, a portion of the bathtub water in the bathtub is drained by the drainage device, and an appropriate amount of hot water in the upper part of the hot water storage tank is poured into the bathtub. The water level can be adjusted while raising the temperature.

  The present invention has been made to eliminate the disadvantage that bacteria are propagated in the bath water by being repeatedly used without draining the bath water in the bath, and it becomes a sanitary unfavorable state. . Connected to the reheating circuit between the discharge side of the reheating pump and the connection part of the mixing valve for the purpose of automatically discharging the bath water in the bathtub and replacing it without any user operation. It was realized by constructing the apparatus so that the bathtub water in the bathtub can be sucked from the bathtub return pipe and discharged from the drain apparatus by the operation of the reheating pump. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a circuit diagram showing an entire system of a hot water supply apparatus of an embodiment when the present invention is applied to a heat pump type hot water supply apparatus. The heat pump type hot water supply apparatus H of the present embodiment includes a heat pump unit A and a hot water storage tank unit B. In the embodiment, the present invention will be described by applying the present invention to a heat pump type hot water supply device that generates hot water in a hot water storage tank by a heat pump refrigerant circuit, but the present invention is not limited to this, The present invention is also applicable to a hot water supply device that generates hot water in a hot water storage tank using a heater.

  As shown in FIG. 2, this heat pump unit A has a compressor 11, a refrigerant-to-water heat exchanger 12, an expansion valve 13 as a decompression means, and an evaporator 15, and these are connected by piping in sequence. The refrigerant circuit 10 is configured. The refrigerant-to-water heat exchanger 12 is configured so that heat can be exchanged between the refrigerant flowing through the refrigerant circuit 10 and the water from the hot water storage tank unit B. Specifically, the refrigerant-to-water heat exchanger 12 of the present embodiment includes a hot water generation circuit connected to a high-temperature and high-pressure refrigerant coming out of the compressor 11 of the refrigerant circuit 10 and a hot water storage tank 20 of the hot water storage tank unit B described later. This is a heat exchanger for exchanging heat with low-temperature water (or cold water) flowing through 30 pipes 31.

  And if the compressor 11 of the heat pump unit A mentioned above is started, a refrigerant | coolant will be suck | inhaled by the compressor 11 and compressed. As a result, the refrigerant becomes a high-temperature and high-pressure refrigerant gas and is discharged from the compressor 11 and flows into the refrigerant-to-water heat exchanger 12. The refrigerant flowing into the refrigerant-to-heat exchanger 12 exchanges heat with the low-temperature water (or cold water) from the hot water storage tank 20 and dissipates heat, and then is decompressed by the expansion valve 13, and is sent to the evaporator 15. Inflow. In the evaporator 15, the refrigerant draws heat from the surrounding air, that is, takes the heat from the surrounding air and evaporates. Thereafter, the refrigerant repeats a cycle in which it leaves the evaporator 15 and is sucked into the compressor 11.

  On the other hand, the hot water storage tank unit B includes a hot water storage tank 20 for storing hot water, a secondary flow path 55 as a reheating circuit, which will be described later, a primary flow path 51, and a mixing valve 70. The hot water storage tank 20 is a tank having a substantially vertical cylindrical shape that can store high-temperature water that has been heated by heat exchange with the refrigerant in the refrigerant-to-water heat exchanger 12 of the heat pump unit A and heated. . Below the hot water storage tank 20, a water supply pipe 41 for supplying water into the tank 20, a pipe 31 of the hot water generation circuit 30, and a pipe 45 of the primary flow path 51 are connected. The water supply pipe 41 is connected to the bottom of the hot water storage tank 20, and one end opens at the lower part in the hot water storage tank 20, and the other end is connected to a water supply source (not shown) such as tap water.

  In addition, the water supply pipe 41 controls a check valve having a forward direction from the water supply source toward the hot water storage tank 20, a pressure reducing valve for reducing the water supply pressure from the water supply source to a predetermined pressure, and water supply from the water supply source. An on-off valve or the like is provided.

  One end of a water supply pipe 71 is connected to the middle of the water supply pipe 41. The water supply pipe 71 extends from one end connected to the water supply pipe 41, and the other end is connected to the other inlet of the mixing valve 70.

  The hot water generation circuit 30 is a circuit for causing the low temperature water (or cold water) in the hot water storage tank 20 to flow through the refrigerant-to-water heat exchanger 12 and heating it to generate high temperature hot water. 31 and a circulation pump 33 interposed in the pipe 31. The pipe 31 is extended from one end opened at the lower part in the hot water storage tank 20 to the refrigerant-to-water heat exchanger 12 of the heat pump unit A, and the middle part thereof is connected to the refrigerant-to-heat heat by the refrigerant-to-water heat exchanger 12. The refrigerant flowing through the exchanger 12 is arranged to be able to exchange heat. The other end of the pipe is connected to the upper part of the hot water storage tank 20.

  The circulation pump 33 is a pump for sucking low-temperature water in the hot water storage tank 20 from the lower part of the hot water storage tank 20, flowing it to the refrigerant-to-water heat exchanger 12 of the heat pump unit A, and then returning it to the upper part of the hot water storage tank 20. The operation is controlled by the control device S. That is, when the circulation pump 33 is operated by the control device S, the low-temperature water in the lower part of the hot water storage tank 20 is sucked into the pipe 31 of the hot water generation circuit 30 and passes through the refrigerant-to-water heat exchanger 12, and then the pipe The cycle of returning to the hot water storage tank 20 from the upper part through 31 is repeated.

  Further, the above-described primary flow path 51 allows the high-temperature water at the top of the hot water storage tank 20 to flow into the water heat exchanger 50 as a reheating heat exchanger, and the primary flow in the water heat exchanger 50. It is a flow path for reheating for heating hot water (tub water) from the bathtub 60 flowing through the secondary flow path 55 provided in heat exchange with the path 51. A pump 52 is interposed in the pipe 45 of the primary flow path 51. The pump 52 is connected to the upper part of the hot water storage tank 20 by the operation of the pump 52 so that the hot water stored in the upper part of the hot water storage tank 20 can be taken out from one end. Has been. A middle portion of the pipe 45 is disposed in a heat exchange manner with the secondary flow path 55 in the water heat exchanger 50. The other end of the pipe 45 is connected to the lower part of the hot water storage tank 20 and opens at the lower part in the hot water storage tank 20.

  On the other hand, the secondary flow path 55 described above is a circuit for chasing for chasing hot water in the bathtub 60. The secondary flow path 55 includes a pump (reheating pump) 56, a water heat exchanger 50, a bathtub return pipe 57 and a bathtub return pipe 58 connected to the bathtub 60. Specifically, one end of a bathtub return pipe 58 for taking out the bathtub water in the bathtub 60 is connected to the bathtub 60.

  A pump 56 is interposed in the middle of the pipe 58. The pump 56 is a reheating pump for sucking the bath water from the bathtub 60 and circulating it in the water heat exchanger 50 and heating it in the water heat exchanger 50. It arrange | positions so that the direction which goes to the heat exchanger 50 may become a forward direction. The other end of the bathtub return pipe 58 is connected to a three-way valve 101 described later. The three-way valve 101 is also connected to one end of a bathtub outlet pipe 57 for returning hot water into the bathtub 60. Further, one end of a discharge pipe 110 described later is connected to the three-way valve 101.

  The pipe 57 extends from one end connected to the three-way valve 101 into the water heat exchanger 50, and a middle portion of the pipe 57 is connected to the primary flow path 51 in the water heat exchanger 50. It is arranged in heat exchange with the pipe 45. Then, this bathtub going-out piping 57 comes out of the said water heat exchanger 50, the other end is connected to the bathtub 60, and the annular circuit which concerns is comprised. The pump 56 and the three-way valve 101 are connected to the control device S, and operation and operation are controlled by the control device S.

  When the reheating operation is performed, the pump 56 is operated by the control device S, and the flow path is switched so that the piping 57 and the piping 58 are communicated by the three-way valve 101. By the operation of the pump 56, the bathtub water (hot water) in the bathtub 60 sucked from the bathtub return pipe 58 flows through the water heat exchanger 50 and is heated by the water heat exchanger 50, and then the bathtub. The cycle of returning from the forward piping 57 into the bathtub 60 will be repeated.

  On the other hand, in the middle of the discharge pipe 57 on the discharge side of the pump 56 of the secondary flow passage 55, that is, in this embodiment, the bathtub return pipe 57 (connection between the three-way valve 101 and the water heat exchanger 50). The other end of the hot water supply pipe 62 is connected to the section 105). One end of the hot water supply pipe 62 is connected to the mixing valve 70, and an open / close valve 63 is interposed in the middle. The on-off valve 63 is an electromagnetic valve for flowing the hot water mixed by the mixing valve 70 to the bathtub 60, and the opening / closing is controlled by the control device S.

  On the other hand, one end of a hot water supply pipe 68 for taking out hot water from the hot water storage tank 20 is connected to the upper part of the hot water storage tank 20. One end of the hot water supply pipe 68 is opened at the upper part in the hot water storage tank 20 so that the hot water in the hot water storage tank 20 can be taken out therefrom. The hot water supply pipe 68 extends from one end opened at the upper part in the hot water storage tank 20 as described above, and the other end is connected to one inlet of the mixing valve 70.

  The mixing valve 70 is electrically variable for mixing hot water from the water supply pipe 41 and hot water from the upper part of the hot water storage tank 20 to obtain hot water of a predetermined temperature, for example, hot water of about + 42 ° C. This is a mixing valve. One end of the hot water supply pipe 62 described above is connected to the outlet of the mixing valve 70. That is, the mixing valve 70 is connected to the secondary flow path 55 between the discharge side of the pump 56 and the water heat exchanger 50 via the hot water supply pipe 62. With such a configuration, the hot water in the hot water storage tank 20 that is set to a predetermined temperature by the mixing valve 70 via the pipe 62 and the secondary flow path 55 (that is, the hot water and tap water from the upper part in the hot water storage tank 20 are Hot water mixed to a predetermined temperature) can be supplied to the bathtub 60.

  Specifically, in this embodiment, the hot water adjusted to a predetermined temperature by the mixing valve 70 is stopped by opening the on-off valve 63 and the operation of the three-way valve 101 (that is, the operation of connecting the pipe 57 and the pipe 58). The hot water filling operation in the bathtub 60 is performed by supplying the water to the bathtub 60 via the water heat exchanger 50 without passing through the pump 56.

  On the other hand, in FIG. 1, 100 is the drainage device of the present invention. The drainage device 100 is provided in the secondary flow path 55 between the discharge side of the pump 56 and the connection portion 105 at the other end of the hot water supply pipe 62 having one end connected to the outlet of the mixing valve 70. Thus, the bathtub water in the bathtub 60 is sucked from the bathtub return pipe 58 and can be discharged.

  Specifically, the drainage device 100 of the present embodiment is the above-described three-way valve 101 as a flow path switching valve provided on the pipe of the secondary flow path 55 (between the bathtub return pipe 58 and the bathtub return pipe 57). Consists of. The three-way valve 101 is connected to the other end of the above-described bathtub return pipe 58 and one end of the bathtub return pipe 57, and is also connected to one end of a discharge pipe 110 provided with a drain port 110A. That is, one end of the discharge pipe 110 is connected to the three-way valve 101, the other end extends outside the hot water supply device H, and is opened by sewage or the like, and the opening at the other end is a drain outlet 110A. ing.

  In this case, when the flow path is switched so that the bathtub return pipe 58 and the discharge pipe 110 communicate with each other by the three-way valve 101, that is, the discharge side of the pump 56 communicates with the drain port 110A, the operation of the pump 56 causes the bathtub to Bath water in the bathtub 60 sucked from the return pipe 58 flows into the discharge pipe 110 via the three-way valve 101 and is discharged to the outside from the drain port 110A. The drainage operation, that is, the switching of the three-way valve 101 and the operation of the pump 56 are controlled by the control device S.

  The capacity of the hot water storage tank 20 of this embodiment is, for example, 370 L, and a plurality of hot water temperature detection sensors connected to the control device S are spaced from the lower part to the upper part of the hot water storage tank 20 by a predetermined interval. Exist. When the detected hot water temperature of each detection sensor is equal to or higher than a predetermined temperature, for example, + 55 ° C. or higher, hot water of + 55 ° C. or higher is stored from the upper end of the hot water storage tank 20 to the position thereof. Judge that there is remaining hot water. In the present embodiment, the detection sensor S1 is located at the position where the remaining hot water amount is 300L, the detection sensor S2 is located at the position where the remaining hot water amount is 250L, the detection sensor S3 is located at the position where the remaining hot water amount is 200L, and the detection sensor S4 is located at the position where the remaining hot water amount is 150L. It is assumed that the detection sensor S5 is disposed at a position of 100L, and the detection sensor S6 is disposed at a position of a remaining hot water amount 50L. The bathtub return pipe 58 is provided with a temperature sensor S8 for detecting the temperature of the bathtub water (hot water) stored in the bathtub 60 and a water level sensor S9 for detecting the water level by water pressure.

  The consumer then enters into a lighting contract with the electric power company for a specific time period, and calculates the amount of water to be heated from the amount of hot water stored at the specified time in the low-night time zone where the fee is low, and the time required for boiling the entire amount. In consideration of the necessary time from the boiling end time, the hot water storage operation is started from the time calculated backward, and the boiling of the entire amount is completed. For example, in this embodiment, the hot water storage is performed by the temperature sensor S7 installed near one end of the pipe 31. The temperature of the hot water taken out from the lower part of the tank 20 is detected, and when the temperature of the hot water detected by the temperature sensor S7 reaches a predetermined boiling end temperature (for example, + 55 ° C. or higher), the hot water storage operation is stopped. It is assumed that control is performed by the control device S. Further, in a time zone other than the above, the hot water storage operation is started when the remaining hot water amount falls below 100L, and is controlled by the control device S so as to stop the hot water storage operation when it becomes 150L or more.

  Further, the operation of the hot water supply apparatus H of this embodiment is controlled by the control apparatus S composed of a microcomputer or the like. The control device S includes the above-described sensors S1 to S9, a bath remote controller (hereinafter referred to as “bath remote controller”) L1 provided in the bathroom, and a kitchen remote controller (hereinafter referred to as “kitchen remote controller” provided in the kitchen). L2 etc.) are connected, and the operation and frequency of the compressor 11 of the heat pump unit A, the operation of the pumps 52 and 56, and the opening and closing of the heat pump unit A according to the electric signal and the temperature signal based on the input information. Opening and closing of the valve 63 (the opening and closing valve of the water supply pipe 41 is not shown), the opening of the expansion valve 13, the mixing amount of high temperature water and low temperature water (tap water in this embodiment) in the mixing valve 70, the flow of the three way valve 101 Path switching control and the like are being executed. The bath remote control L1 includes various switches, for example, a hot water filling switch for executing a hot water filling operation of the bathtub 60, a reheating switch for executing the hot water driving operation of the bathtub 60, and a drain operation of the bathtub 60. A drain switch for executing, a cleaning switch for executing the cleaning operation, a temperature setting switch for setting the temperature of the hot water in the bathtub 60, and the like are provided.

  In particular, the control device S of the present embodiment periodically performs a bath water discharge operation in the bath 60 from the drainage device 100. In addition to the above (other than periodic), the drainage operation is executed based on some starting point. For example, as described above, the control device S also performs the drainage device 100 when the user operates the bath remote control L1 (for example, in this embodiment, when the drain switch provided in the bath remote control L1 is pressed). Execute the drain operation of bathtub water from. In the present embodiment, the control device S discharges part of the bathtub water in the bathtub 60 from the drainage device 100 and operates the bath remote controller L1 as a periodic discharge operation before executing the follow-up operation. All the bathtub water in the bathtub 60 is discharged from the drainage device 100.

  The discharging operation is not limited to the above. For example, when the control device S detects that the hot water is filled in the bathtub 60, the time counting is started, and when a predetermined time has elapsed, the draining operation may be executed. In this case, for example, the temperature sensor S8 or the water level sensor S9 may be used to detect that the hot water has been filled in the bathtub 60, or when the hot water filling operation is executed by the control device S, the time is counted. It does not matter as a starting point. Alternatively, the present invention is also effective when a sensor capable of detecting the propagation of bacteria in the bathtub water in the bathtub 60 is provided and the control device S executes the drainage operation based on the detection of the sensor. Further, when the drainage operation is performed before the follow-up operation is performed as in the present embodiment, the drainage operation from the drainage device 100 may be performed every time before the follow-up operation is performed. The draining operation may be executed every time.

  Further, in the present embodiment, the control device S discharges part of the bathtub water in the bathtub 60 from the drainage device 100 in the periodic discharging operation, but all of the bathtub water in the bathtub 60 from the drainage device 100. It can be discharged.

  Next, the operation of the hot water supply apparatus H according to this embodiment will be described.

(1) Hot Water Storage Operation First, a hot water storage operation for generating hot water in the hot water storage tank 20 will be described. The hot water storage operation usually calculates the amount of boiling water from the amount of hot water stored at a predetermined time and the time required to boil up the entire amount in the midnight hours when electricity charges are low, and considers the necessary time from the boiling end time. Then, the hot water storage operation is started from the time T calculated backward. When the remaining hot water amount falls below a predetermined amount (100 L in the present embodiment) in other time zones, that is, the remaining hot water amount in the hot water storage tank 20 is detected by the hot water temperature detection sensor S5 disposed at the position of 100L. The hot water storage operation is started when the hot water temperature is lower than a predetermined temperature (for example, less than + 55 ° C. in the present embodiment). In this hot water storage operation, the control device S controls the rotational speed of the compressor 11 of the heat pump unit A and the expansion valve 13 so that the temperature of the high temperature water returning to the hot water storage tank 20 becomes a predetermined high temperature, for example, + 85 ° C. It is assumed that the valve opening is controlled.

  The control device S is configured so that the hot water temperature detected by the hot water temperature detection sensor S5 disposed at the time T described above in the midnight time zone or the amount of hot water in the hot water storage tank 20 at a position of 100L is lower than a predetermined temperature (for example, In this embodiment, when the temperature is less than + 55 ° C., the operation of the compressor 11 of the heat pump unit A is started. As a result, the low-temperature and low-pressure refrigerant gas sucked into the compressor 11 is compressed by the compression mechanism portion of the compressor 11 and becomes a high-temperature and high-pressure refrigerant gas that is discharged to the refrigerant-to-water heat exchanger 12 to dissipate heat. Then, the pressure is reduced by the expansion valve 13 and flows into the evaporator 15. After the surrounding heat is pumped up and evaporated by the evaporator 15, the cycle of sucking into the compressor 11 is repeated.

  Further, the control device S starts the operation of the circulation pump 33 of the hot water generation circuit simultaneously with the start of the compressor 11 of the heat pump unit A. Thereby, the low temperature water (or cold water) of the lower part in the hot water storage tank 20 is taken out from one end of the piping 31 connected to the lower part of the hot water storage tank 20. Thereby, the low temperature water taken out from the lower part in the hot water storage tank 20 flows into the pipe 31 of the hot water generation circuit 30 and passes through the refrigerant-to-water heat exchanger 12. At this time, the refrigerant-to-heat exchanger 12 exchanges heat between the low-temperature water flowing through the pipe 31 and the high-temperature refrigerant from the compressor 11. That is, the low temperature water taken out from the lower part of the hot water storage tank 20 is heated by the refrigerant by exchanging heat with the high temperature refrigerant from the compressor 11 to become high temperature water. The hot water heated to the high temperature by the refrigerant-to-water heat exchanger 12 exits from the refrigerant-to-water heat exchanger 12 and returns to the upper part of the hot water storage tank 20.

  Then, in the hot water storage operation in the midnight time zone, when the boiling of the whole amount is completed (that is, in this embodiment, hot water taken out from the lower part of the hot water storage tank 20 detected by the temperature sensor S7 provided on one end side of the pipe 31). When the temperature rises to a predetermined temperature (for example, + 55 ° C.), or when the remaining hot water amount exceeds a predetermined value (for example, 150 L) in a time zone other than midnight, the control device S operates the compressor 11 of the heat pump unit A. And the circulation pump 33 is stopped and the hot water supply operation mentioned above is complete | finished.

(2) Hot water filling operation Next, the operation of hot water filling the bathtub 60 will be described. For example, when the user presses the hot water filling switch of the bath remote control L1 provided in the bathroom, the control device S starts the hot water filling operation of the bathtub 60. In the hot water filling operation, the control device S opens the on-off valve 63 and controls the three-way valve 101 so that the pipe 57 and the pipe 58 communicate with each other. At this time, the pump 56 of the secondary flow channel 55 remains stopped. Moreover, the amount of hot water taken out from the hot water storage tank 20 and the high-temperature water so that hot water having a predetermined temperature (for example, + 42 ° C.) is generated by the control valve S at the mixing valve 70 and supplied to the bathtub 60. It is assumed that the amount of tap water mixed is controlled.

  When the hot water filling operation is started, the hot water in the hot water storage tank 20 is taken out from the hot water supply pipe 68 connected to the upper part of the hot water storage tank 20. This hot water flows into the mixing valve 70. The hot water from the hot water storage tank 20 is mixed with the tap water supplied from the pipe 71 by the mixing valve 70 to obtain hot water of about + 42 ° C., and then comes out of the mixing valve 70 and passes through the hot water supply pipe 62. Then, it enters the secondary flow path 55 and is supplied to the bathtub 60 through the water heat exchanger 50 without passing through the stopped pump 56 and the pump 56. When a predetermined amount of hot water is supplied to the bathtub 60, for example, when a predetermined amount of water level is detected by the water level sensor S9 provided in the bathtub return pipe 58, the control device S ends this hot water filling operation. .

(3) Purging operation and draining operation before chasing operation (automatic draining operation)
Next, the operation | movement in the chasing operation of the bathtub water (hot water) in the bathtub 60 is demonstrated. In this case, in the present embodiment, the discharge operation from the drainage device 100 is executed before the follow-up operation is performed as described above, so that the control device S can be used by the user for the follow-up switch of the bath remote controller L1. When the temperature of the bathtub water in the bathtub 60 detected by the temperature sensor S8 is lowered to a predetermined temperature, the drainage operation from the drainage device 100 is executed before entering the normal reheating operation. . That is, the control device S starts the pump 56 of the secondary flow path 55 and connects the bathtub return pipe 58 and the discharge pipe 110 by the three-way valve 101 so that the discharge side of the pump 56 communicates with the drain port 110A. Switch the flow path. Thereby, the bathtub water in the bathtub 60 is sucked from the bathtub return pipe 58. This bathtub water enters the discharge pipe 110 from the bathtub return pipe 58 via the three-way valve 101 and is discharged to the outside through the drain port 110A.

  Thereafter, when the water level in the bathtub 60 drops to a predetermined value, or when a predetermined time has elapsed since the pump 56 was started, the pump 56 is stopped, the discharge operation is terminated, and the operation shifts to the chasing operation. In this case, since the water level in the bathtub 60 is lowered by the discharge operation, the control device S is first provided, for example, in the bathtub return pipe 58 until the water level in the bathtub 60 reaches a predetermined water level. After the hot water filling operation described above is executed until a predetermined amount of water level is detected by the water level sensor S9 (the hot water filling operation is as described above, the description is omitted here), and the chasing operation is performed. Executed.

  That is, the control device S operates the pump 52 of the primary flow path 51 and the pump 56 of the secondary flow path 55, and communicates the bathtub return pipe 58 and the bathtub return pipe 57 of the secondary flow path 55 in three directions. The flow path of the valve 101 is switched. Thereby, the hot water in the hot water storage tank 20 and the bathtub water (hot water) from the bathtub 60 can be heat-exchanged by the water heat exchanger 50, and the bathtub water of the bathtub 60 can be pursued.

  Specifically, when the reheating operation is started (when each of the pumps 52 and 56 is started), the high-temperature water taken out from the upper part of the hot water storage tank 20 to the primary flow path 51 by the operation of the pump 52 is heated by water. It passes through the exchanger 50. Similarly, the bathtub water in the bathtub 60 is taken out to the secondary flow path 55 by starting the pump 56, and the bathtub water enters the water heat exchanger 50. As described above, since the primary flow path 51 and the secondary flow path 55 are arranged in a heat exchange manner in the water heat exchanger 50, the secondary flow in the process of passing through the water heat exchanger 50. Bath water (hot water) from the bathtub 60 flowing through the passage 55 is heated by exchanging heat with hot water from the upper part of the hot water storage tank 20 flowing through the primary passage 51 provided in heat exchange with the secondary passage 55. Is done. The bath water heated by taking heat from the high-temperature water flowing through the primary flow path 51 in the water heat exchanger 50 is repeated from the water heat exchanger 50 to return to the bathtub 60 again.

  On the other hand, the hot water flowing through the primary flow path 51 whose temperature has decreased due to heat exchange with the bathtub water flowing through the secondary flow path 55 in the water heat exchanger 50 is discharged from the water heat exchanger 50 and stored in the hot water storage tank 20. The cycle of returning from the lower part to the hot water storage tank 20 is repeated.

  If the temperature of the bathtub water in the bathtub 60 detected by the temperature sensor S8 provided in the bathtub return pipe 58 is maintained at a predetermined temperature (for example, increased to + 42 ° C.) by continuing the chasing operation described above, control is performed. The device S stops the pumps 52 and 56 and ends the chasing operation.

  As described above, in the hot water supply device H of the present invention, the drainage device 100 is connected to the secondary flow path 55 between the discharge side of the pump 56 and the connection portion 105 of the mixing valve 70, and the bathtub returns by the operation of the pump 56. Since the bathtub water in the bathtub 60 is sucked from the pipe 58 and can be discharged from the drainage device 100, the bathtub water in the bathtub 60 can be discharged by the drainage device 100. In particular, as shown in this embodiment, the drainage device 100 is connected to the secondary flow path 55 as a circuit for pursuit, and the bath water in the bathtub 60 can be sucked and discharged by the operation of the pump 56. Since it can discharge | emit without providing the suction means for attracting | sucking water from the inside of the bathtub 60, cost increase can be suppressed as much as possible.

  Further, as in the hot water supply apparatus H of the present embodiment, the drainage device 100 is provided in the secondary channel 55 and is constituted by a three-way valve 101 as a channel switching valve communicated with the drain port 110A. If the bath water in the bathtub 60 is discharged from the drain port 110A by switching the flow path so that the discharge side of the pump 56 communicates with the drain port 110A by 101, the bathtub water in the bathtub 60 can be easily configured. It can be easily discharged.

  In the conventional apparatus, the discharge of the bathtub water in the bathtub is only from the drain port provided at the bottom of the bathtub, and is performed by the user's operation. In other words, since the drainage of the bathtub water in the bathtub is dependent on the user, there is a possibility that it may not be drained for days. In particular, the reheating circuit is equipped with a filter for preventing malfunction of the device, and by circulating hot water in the bathtub to the reheating circuit, visible dust is removed by the filter. In many cases, the user misunderstood the clean hot water and the bath water was not replaced for a long time. In this way, if the bath water is used repeatedly without being replaced, the bacteria will propagate in the bath water, and the bacteria will bathe in the propagated bath water. There has been a problem that there is a high possibility that diseases such as allergies will appear.

  However, according to the present invention, the drainage device 100 can automatically drain the bathtub water in the bathtub 60 without depending on the artificial bathtub water draining operation by the user's operation. Thereby, it is possible to avoid the propagation of bacteria in the bathtub water in the bathtub 60, and a clean bath is always possible.

In particular, when adjusting the water level in the bathtub 60, the drainage device 100 discharges the bathtub water in the bathtub 60 to be below the water level, and pours an appropriate amount of high-temperature water in the hot water storage tank 20 into the bathtub 60. By performing the hot water, the water level in the bathtub 60 is set to a required height. And if the temperature of the bathtub water in the bathtub 60 has not reached the optimal temperature, a chasing operation will be performed and the temperature of the bathtub water in the bathtub 60 will be made into the optimal temperature. Thus, when adjusting the water level in the bathtub 60, after draining part of the bathtub water in the bathtub 60 by the drainage device 100, hot water for pouring hot water in the upper part of the hot water storage tank 20 into the bathtub 60. By adjusting the water level in the bathtub 60, the temperature of the bathtub water in the bathtub 60 can be adjusted (the temperature of the bathtub water rises), so that the efficiency can be improved and the time for the follow-up operation can be improved. Can be shortened or suppressed as much as possible.
(4) Hot water supply operation In the present embodiment, when hot water is used in a kitchen or shower other than a bathtub, so-called hot water supply operation is not particularly described, but the hot water storage tank 20 includes an upper portion in the hot water supply tank 20. A take-out pipe for taking out high-temperature water, hot water taken out from the take-out pipe and tap water are mixed, and a predetermined temperature (a temperature set by a user at a shower, a kitchen remote control L2, etc., for example, + 36 ° C.) It is assumed that a mixing valve for setting the temperature to any one of .about. + 48.degree. C. or + 60.degree. C. and a hot water supply pipe for supplying hot water adjusted by the mixing valve to a shower, a kitchen or the like. When the user operates a shower or kitchen faucet, hot water is taken out from the hot water storage tank 20 and mixed with tap water by a mixing valve to a predetermined temperature. It shall be supplied to the kitchen.
(5) Drainage operation (Drainage operation based on user operation)
On the other hand, in addition to the draining operation before the chasing operation described above, the control device S of the present embodiment executes the draining operation when the drain switch provided on the bath remote controller L1 is pressed by the user. That is, the control device S starts the pump 56 of the secondary flow path 55 and connects the bathtub return pipe 58 and the discharge pipe 110 by the three-way valve 101, and the discharge side of the pump 56 is connected to the drain port 110A. Switch the path. Thereby, the bathtub water in the bathtub 60 is sucked from the bathtub return pipe 58. This bathtub water enters the discharge pipe 110 from the bathtub return pipe 58 via the three-way valve 101 and is discharged to the outside through the drain port 110A.

Thereafter, when all of the bathtub water in the bathtub 60 is discharged, or when a predetermined time elapses after the pump 56 is started and it is estimated that all of the bathtub water in the bathtub 60 has been discharged, the pump 56 is stopped. Then, the drainage operation is finished.
(6) Cleaning Operation By the way, in the hot water supply apparatus H of the present embodiment, the cleaning operation can be executed by the drainage device 100 described above. Here, the operation | movement in the said washing | cleaning driving | operation is demonstrated concretely. In this embodiment, it is assumed that the cleaning operation is performed every time the above-described drainage operation is performed and also when the cleaning switch provided in the bath remote controller L1 is operated.

  In the cleaning operation, the control device S opens the on-off valve 63, switches the flow path so that the discharge side of the pump 56 communicates with the drain port 110A by the three-way valve 101, and starts the operation of the pump 56. Accordingly, the hot water that has flowed from the mixing valve 70 into the bathtub outlet pipe 57 of the secondary channel 55 via the hot water supply pipe 62 is supplied to the bathtub 60 via the water heat exchanger 50. That is, the hot water is poured from the mixing valve 70 to the bathtub 60 through the water heat exchanger 50. Furthermore, the hot water in the bathtub 60 is sucked from the bathtub return pipe 58 by the operation of the pump 56, enters the discharge pipe 110 via the three-way valve 101, and is discharged to the outside from the drain port 110A.

  As described above, by executing the cleaning operation, the pipes 68, 62, 57, 58 and the bathtub 60 can be washed away by pouring from the mixing valve 70. Moreover, since the warm water after washing them out is discharged from the drain outlet 110A, each pipe and the inside of the bathtub 60 can be kept hygienic by the washing operation.

In the present embodiment, it is described that the cleaning operation is performed every time the drainage operation by the drainage device 100 is executed and when the user presses the cleaning switch provided in the bath remote controller L1. In addition to this, the cleaning operation may be automatically executed before or after another operation.
(7) Freezing prevention operation On the other hand, when such a hot water supply device H is used in an environment where the outside air temperature is below freezing, such as in winter, the piping of the secondary flow path 55 connected to the bathtub 60 (the bathtub outlet pipe 57 and the bathtub) The return pipe 58) may freeze. As described above, when the pipes 57 and 58 are used in an environment in which there is a risk of freezing, the control device S performs the freeze prevention operation.

  In this anti-freezing operation, bath water in the bath 60 has been used conventionally. Specifically, in the conventional freezing prevention operation, the bathtub water in the bathtub 60 is sucked from the bathtub return pipe 58 by the operation of the pump 56, passed through the water heat exchanger 50, and then the bathtub 60 is sent from the bathtub outlet pipe 57. It was supposed that the equipment in the secondary flow path 55 was prevented from freezing by the bathtub water in the bathtub 60 by repeating the circulation returning to the inside.

  In such a conventional anti-freezing operation, the bathtub water in the bathtub 60 is used, and therefore, when the temperature of the bathtub water is low, the anti-freezing effect can be obtained even if the bathtub water flows through the secondary channel 55. It cannot be fully demonstrated. In this case, the conventional hot water supply device cannot add hot water from the hot water storage tank to increase the temperature of the bath water. That is, in the conventional hot water supply apparatus shown in FIG. 3, since there is no drainage device 100 that can automatically drain water as in the present invention, when the hot water is poured into the bathtub 60 from the hot water storage tank 20, the water level in the bathtub 60 rises, Since hot water may overflow from 60, pouring from the hot water storage tank 20 cannot be performed or only a small amount can be poured. For this reason, it was difficult to raise the temperature of the bath water in which the temperature fell. In this case, in order to raise the temperature of the bath water used for the freeze prevention operation, the reheating operation was performed, but it took time to raise the temperature by replenishing the amount of hot water in the bathtub 60.

  However, since the hot water supply apparatus H of the present invention includes the drainage device 100, the drainage device 100 can partially discharge the bathtub water in the bathtub 60 before the freeze prevention operation is performed. Specifically, the operation of the freeze prevention operation in the hot water supply apparatus H of the present embodiment will be described. First, the control device S switches the flow path so that the discharge side of the pump 56 communicates with the drain port 110A by the three-way valve 101, and starts the operation of the pump 56. Thereby, the bathtub water in the bathtub 60 is sucked from the bathtub return pipe 58 by the operation of the pump 56, enters the discharge pipe 110 through the three-way valve 101, and is discharged to the outside from the drain port 110A.

  Thereafter, when the water level in the bathtub 60 drops to a predetermined value or when a predetermined time has elapsed since the pump 56 was started, the pump 56 is stopped. The above is the operation of partially discharging the bathtub water in the bathtub 60 by the drainage device 100 before the freeze prevention operation is executed.

  Next, the control device S controls the three-way valve 101 to open the on-off valve 63 and to connect the pipe 57 and the pipe 58 in the same manner as in the hot water filling operation described above. As a result, the hot water that has flowed from the mixing valve 70 into the bathtub outlet pipe 57 of the secondary flow path 55 via the hot water supply pipe 62 passes through the water heat exchanger 50 without passing through the stopped pump 56 and the pump 56. To the bathtub 60. The water is supplied to the bathtub 60 through the water heat exchanger 50.

  On the other hand, when the water level of the bathtub water in the bathtub 60 reaches a predetermined water level by pouring from the mixing valve 70 into the bathtub 60 via the secondary channel 55, the on-off valve 63 is closed and the pump 56 is turned on. The conventional anti-freezing operation described above is executed.

  Thus, before the freeze prevention operation is executed, a portion of the bathtub water in the bathtub 60 is discharged by the drainage device 100, so that more hot water can be supplied from the hot water storage tank 20 into the bathtub 60. it can. Thereby, the temperature of the bath water circulated through the secondary channel 55 can be effectively increased, and an effective and efficient anti-freezing operation can be realized.

  Furthermore, in the hot water supply apparatus H of the present invention, it is possible to perform the freeze prevention operation while discharging the hot water supplied into the bathtub 60 with the drainage apparatus 100. Specifically, when performing such anti-freezing operation, the control device S opens the on-off valve 63 in the same manner as in the above-described washing operation, and the three-way valve 101 causes the discharge side of the pump 56 to communicate with the drain port 110A. While switching the flow path, the operation of the pump 56 is started. Accordingly, the hot water that has flowed from the mixing valve 70 into the bathtub outlet pipe 57 of the secondary channel 55 via the hot water supply pipe 62 is supplied to the bathtub 60 via the water heat exchanger 50. Furthermore, the bathtub water (hot water) in the bathtub 60 is sucked from the bathtub return pipe 58 by the operation of the pump 56, enters the discharge pipe 110 through the three-way valve 101, and is discharged to the outside from the drain port 110A.

  Thus, by providing the drainage device 100, it is possible to perform the freeze prevention operation while discharging the hot water supplied into the bathtub 60 as described above with the drainage device 100. In particular, according to the present invention, before the freeze prevention operation is performed as described above, a part of the bathtub water in the bathtub 60 is discharged by the drainage device 100 and then the mixing valve 70 is connected via the hot water supply pipe 62. The freezing operation which supplies the bathtub 60 via the water heat exchanger 50 without passing through the pump 56 which stopped the secondary flow path 55, and the pump 56, and the bath water in the bathtub 60 in the secondary flow path 55 It is also possible to switch between a conventional freeze prevention operation for circulating the water and a freeze prevention operation for supplying hot water from the hot water storage tank 20 and discharging the supplied hot water from the drainage device 100.

  In the above-described embodiment, the present invention is applied to the heat pump type hot water supply apparatus H. As described above, when the present invention is applied to the heat pump type hot water supply apparatus H, energy efficiency is better than that of the hot water supply apparatus that heats the water in the hot water storage tank by the electric heater, so that further energy saving can be realized. it can. However, the inventions according to claims 1 to 5 are not limited to the heat pump type hot water supply apparatus, and it is effective to apply the present invention to a hot water supply apparatus that generates hot water using an electric heater.

BRIEF DESCRIPTION OF THE DRAWINGS It is a system circuit diagram of the whole hot-water supply apparatus of one Example of this invention (Example 1). It is a refrigerant circuit figure of the heat pump unit of FIG. It is a system circuit diagram of the whole conventional hot-water supply apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS A Heat pump unit B Hot water storage tank unit H Heat pump hot water supply apparatus S Controller S1-S9 Sensor 10 Refrigerant circuit 11 Compressor 12 Refrigerant to water heat exchanger 13 Expansion valve 15 Evaporator 20 Hot water storage tank 30 Hot water generation circuit 33 Circulation pump 41 Water supply piping 50 Water heat exchanger 51 Primary flow path 52 Pump 55 Secondary flow path 56 Pump (pumping pump)
57 Bathtub piping 58 Bathtub return piping 60 Bathtub 63 On-off valve 70 Mixing valve 100 Drainage device 101 Three-way valve 110 Drainage piping 110A Drainage port

Claims (7)

A hot water storage tank for storing hot water, a reheating pump, a reheating heat exchanger, a reheating circuit having a bathtub return pipe and a bathtub return pipe, the discharge side of the reheating pump, and the reheating heat A mixing valve connected to the reheating circuit between the exchangers, and the hot water in the hot water storage tank, which is set to a predetermined temperature by the mixing valve, is supplied to the bathtub via the reheating circuit. At the same time, after the bath water in the bathtub sucked from the bathtub return pipe is circulated to the heat exchanger for heating and heated by the operation of the follow-up pump, it is returned to the bathtub from the bathtub return pipe. In a hot water supply device that can be operated in a fired manner,
A drainage device connected to the circuit for heating between the discharge side of the pump for heating and the connecting part of the mixing valve, and the bathtub returning from the bathtub return pipe by the operation of the pump for heating The hot-water supply apparatus characterized by sucking in the bathtub water and being able to discharge | emit it from the said drainage device.   The drainage device is composed of a flow path switching valve that is interposed in the chase circuit and communicates with a drain port, and the flow path switching valve allows the discharge side of the chase pump to communicate with the drain port. The hot water supply apparatus according to claim 1, wherein bath water in the bathtub is discharged from the drain outlet by switching a path.   The flow path switching valve switches the flow path so that the discharge side of the reheating pump communicates with the drain port, and pours water from the mixing valve through the reheating heat exchanger to the bathtub from the bathtub outlet pipe. The hot water supply apparatus according to claim 2, wherein a washing operation is performed by operating the chasing pump and discharging the bathtub water in the bathtub from the drain outlet.   4. The bathtub water in the bathtub is partially discharged by the drainage device before performing the chasing operation using the chasing circuit. 5. The hot water supply device described.   Before performing the freeze prevention operation by circulating the bathtub water in the bathtub, or during the execution of the freeze prevention operation, a part of the bathtub water in the bathtub is discharged by the drainage device, and the mixing valve is used. The hot water supply apparatus according to any one of claims 1 to 4, wherein the hot water is poured into the bathtub through the reheating circuit.   The hot water is generated in the hot water storage tank by a heat pump refrigerant circuit configured to include a compressor, a refrigerant-to-water heat exchanger, and an evaporator. Water heater.   The hot water supply apparatus according to claim 2, wherein a hot water supply for pouring hot water in the hot water storage tank into the bathtub is performed after part of the bathtub water in the bathtub is discharged by the drainage device.

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