JP2010085012A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water heater inexpensively enabling air vent from an upper part within a hot water storage tank and discharge of low-temperature water from the lower part of the hot water storage tank. <P>SOLUTION: The water heater includes a constant pressure shut-off valve mechanism 110 as a constant pressure shut-off valve interposed between a relief valve mechanism 101 as a pressure relief valve and the hot water storage tank 20. The constant pressure shut-off valve mechanism 110 includes: a first inlet 112 communicated with the upper part within the tank 20; a second inlet 113 communicated with the lower part within the tank 20; an outlet 115 communicated with the relief valve mechanism 101 and the second inlet 113; and an on-off valve 120 for opening/closing a passage 125 between the first inlet 112 and the second inlet 113. When the pressure within the hot water storage tank 20 is increased up to a predetermined shut-off pressure value lower than a relief pressure value, the on-off valve 120 shuts off the passage 125 between the first inlet 112 and the second inlet 113. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hot water supply apparatus. In particular, the present invention relates to a hot water supply device that generates hot water in a hot water supply device and includes a pressure relief valve that is opened when the pressure in the hot water storage tank rises to a predetermined pressure.

  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 generating and storing hot water, and a heat pump refrigerant circuit having a compressor, a heat exchanger, and an evaporator. After taking out the low temperature water (or cold water) from the bottom 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 to heat the low temperature water to high temperature water, Returning to the top, the hot water was stored in a hot water storage tank.

  By the way, in such a hot water supply device, when the low temperature water (or cold water) in the hot water storage tank becomes hot, the volume of the water expands, and therefore, a pressure relief valve for releasing the pressure in the tank to the outside is provided. The volume expanded by the pressure relief valve was discharged to the outside of the hot water storage tank as overflow water. This pressure relief valve is provided in the upper part of the hot water tank, and the pressure relief valve also vents the air in the hot water tank to prevent corrosion of the hot water tank. Therefore, it was possible to perform both discharge of overflow water and air venting by the pressure relief valve.

  In addition, the pressure relief valve has a structure that also serves as an air vent in the hot water storage tank as described above, and thus is provided in the upper part of the hot water storage tank. Therefore, the hot water in the hot water storage tank discharged from the pressure relief valve becomes the high temperature water stored in the upper part of the hot water storage tank, causing a problem of heat loss. In order to solve this problem of heat loss, it is desirable to discharge the low-temperature water in the lower part of the hot water tank as overflow water. In this case, separate the overflow water take-off valve and the air vent valve. It was necessary to install it, and it caused an increase in cost.

In addition, a valve that takes out overflow water from the lower part and an air vent valve are being developed (see, for example, Patent Document 1). However, since a control device for controlling the valve is required, an installation space is required. There was a problem that the increase in cost and the cost increase occurred.
JP 2006-138513 A

  Furthermore, since the parts of the control device that controls the opening and closing of the valve described above are electric control, power consumption increases and loss in the substrate also occurs, so improvement in energy savings has been eagerly desired.

  The present invention has been made to solve the conventional technical problem, and provides a hot water supply apparatus that can realize air venting from the upper part of the hot water storage tank and discharge of low-temperature water from the lower part of the hot water storage tank at a low cost. For the purpose.

  The hot water supply apparatus of the present invention includes a pressure relief valve that generates hot water in a hot water storage tank and opens when the pressure in the hot water storage tank rises to a predetermined relief pressure value. And a hot water storage tank. The pressure shut-off valve includes a first inlet portion communicating with the upper portion of the tank, a second inlet portion communicating with the lower portion of the tank, and a pressure relief valve. And an outlet part communicating with the second inlet part, and an on-off valve part for opening and closing a passage between the first inlet part and the second inlet part, the on-off valve part has a pressure in the hot water storage tank. The passage between the first inlet portion and the second inlet portion is blocked when the pressure rises to a predetermined cutoff pressure value lower than the relief pressure value.

  A hot water supply apparatus according to a second aspect of the present invention is characterized in that, in the above invention, the pressure relief valve is connected to the pressure cutoff valve corresponding to the outlet portion of the pressure cutoff valve.

  A hot water supply apparatus according to a third aspect of the present invention is characterized in that in each of the above inventions, hot water is generated in a hot water storage tank by a heat pump refrigerant circuit configured to include a compressor, a refrigerant-to-water heat exchanger, and an evaporator. To do.

  According to the present invention, a hot water supply apparatus is provided with a pressure relief valve that generates hot water in a hot water storage tank and opens when the pressure in the hot water storage tank rises to a predetermined relief pressure value. And a hot water storage tank. The pressure shut-off valve includes a first inlet portion communicating with the upper portion of the tank, a second inlet portion communicating with the lower portion of the tank, and a pressure relief valve. And an outlet part communicating with the second inlet part, and an on-off valve part for opening and closing a passage between the first inlet part and the second inlet part, the on-off valve part has a pressure in the hot water storage tank. When the pressure rises to a predetermined shutoff pressure value lower than the relief pressure value, the passage between the first inlet portion and the second inlet portion is shut off, so that the pressure in the hot water storage tank rises to the prescribed relief pressure value. If the pressure relief valve is opened, the second inlet The inflow tank bottom of the water can be discarded to the outside from the outlet portion Ri.

  In particular, according to the present invention, air can be vented from the upper part of the hot water storage tank without any trouble.

  According to the invention of claim 2, in the above invention, since the pressure relief valve is connected to the pressure cutoff valve corresponding to the outlet portion of the pressure cutoff valve, the pressure relief valve and the pressure cutoff valve are integrated. The space efficiency can be improved.

  Furthermore, according to the invention of claim 3, since hot water is generated in the hot water storage tank by the heat pump refrigerant circuit having the compressor, the refrigerant-to-water heat exchanger and the evaporator in each of the above-mentioned inventions, Compared with the case where the water in the hot water storage tank is heated by the heater, the energy efficiency is higher and energy saving can be realized.

  Conventionally, the present invention has a problem that high temperature water stored in the upper part of the hot water storage tank is discharged and heat loss is caused by performing the overflow water in the hot water storage tank by a pressure relief valve provided in the upper part of the tank. It was made to solve the problem. A pressure shut-off valve interposed between the pressure relief valve and the hot water storage tank is provided for the purpose of enabling air venting in the tank while discharging overflow water while suppressing heat loss as much as possible. A first inlet that communicates with the upper part of the tank, a second inlet that communicates with the lower part of the tank, an outlet that communicates with the pressure relief valve and the second inlet, a first inlet and a second An open / close valve portion that opens and closes a passage between the inlet portions of the hot water storage tank, and the open / close valve portion is configured such that when the pressure in the hot water storage tank rises to a predetermined cutoff pressure value lower than the relief pressure value, This was realized by blocking the passage between the part and the second inlet part. 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 according to an embodiment of the present invention, and is an example in a case where 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 is applied to a heat pump type hot water supply apparatus. However, the present invention is not limited to this, and hot water is generated in the hot water supply apparatus. Any hot water supply device provided with a pressure relief valve that can release this pressure when the internal pressure rises to a predetermined pressure can be applied. For example, the present invention can be applied even if hot water in a hot water storage tank is generated using an electric 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. The heat exchanger exchanges heat with low-temperature water (or cold water) flowing through 30 pipes 34.

  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 gas refrigerant and is discharged from the compressor 11 and flows into the refrigerant-to-water heat exchanger 12. The refrigerant that has flowed into the refrigerant-to-water heat exchanger 12 exchanges heat with the low-temperature water (or cold water) from the hot water storage tank 20 described above to dissipate heat, and then is decompressed by the expansion valve 13, and the evaporator 15 Flow into. 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. 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 44 for discharging the hot water in the tank 20, or flowing it to the pipe 31 of the hot water generating circuit 30, and a description will be given later. The piping 45 of the primary flow path 51 to be connected is 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 FIG. 1, 42 is a check valve whose forward direction is from the water supply source toward the hot water storage tank 20, and 43 is a pressure reducing valve. The pressure reducing valve 43 is set so as to reduce the tap water supply pressure to a predetermined pressure, for example, 170 kPa (about 1.7 kgf / cm ² ).

  One end of the water supply pipe 71 is connected between the hot water storage tank 20 and the pressure reducing valve 43 in 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 branches into two branches. One pipe 71A is connected to the other of the first mixing valve 70 described later via a check valve 72. Connected to the entrance. The other branched pipe 71 </ b> B is connected to a second mixing valve 75 described later via a check valve 73. Each of the check valves 72 and 73 has a forward direction from the water supply pipe 41 toward the mixing valves 70 and 75, respectively.

  Further, on the upstream side of the check valve 42 of the water supply pipe 41, that is, the pipe 41 between the check valve 42 and the water supply source, an opening / closing valve (not shown) for controlling the water supply from the water supply source is provided. It has been.

  One end of the pipe 44 opens in the lower part of the hot water storage tank 20 and the other end extends to the outside and is connected to a pipe such as sewage. A valve device 44V is attached to the pipe 44. By opening the valve device 44V, the hot water in the hot water storage tank 20 can be discharged to the outside through the pipe 44.

  In addition, one end of the pipe 31 of the hot water generation circuit 30 described above is connected to an intermediate portion of the pipe 44 on the upstream side of the valve device 44V (that is, the hot water storage tank 20 side). The other end of the pipe 31 is connected to one inlet of the three-way valve 32. One end of the pipe 34 is connected to the outlet of the three-way valve 32. A middle portion of the pipe 34 extends to the refrigerant-to-water heat exchanger 12 of the heat pump unit A, and is arranged so that heat can be exchanged with the refrigerant in the refrigerant-to-water heat exchanger 12. The other end of the pipe 34 is connected to a middle part of the pipe 35 that connects the other inlet of the three-way valve 32 and the upper part of the hot water storage tank 20. Reference numeral 33 denotes a circulation pump having a forward direction on the heat pump unit A side of the pipe 34, that is, a direction from the outlet of the three-way valve 32 of the pipe 34 toward the refrigerant to water heat exchanger 12 of the heat pump unit A. The operation is controlled by the control device S. When the circulation pump 33 is operated by the control device S and one inlet and the outlet are communicated by the three-way valve 32, the low-temperature water in the lower part of the hot water storage tank 20 is taken out from the hot water storage tank 20, and the piping 31 Then, after entering the pipe 34 via the three-way valve 32 and passing through the refrigerant-to-water heat exchanger 12, the cycle of returning from the upper part to the hot water storage tank 20 via the pipe 35 is repeated.

  Further, the above-described primary flow path 51 allows high-temperature water in the upper part of the hot water storage tank 20 to flow into the water-to-water heat exchanger 50 and exchanges heat with the primary flow path 51 in the water-to-water heat exchanger 50. It is a flow path for reheating for heating the hot water from the bathtub 60 which flows through the secondary flow path 55 provided in the. The primary flow path 51 includes a hot water supply pipe 68 connected to the upper part of the hot water storage tank 20, a pipe 69, a pipe 45, and a circulation pump 52 for replenishment interposed in the pipe 45. . A part of the pipe 45 is disposed in heat exchange with the secondary channel 55 in the water-to-water heat exchanger 50.

  The secondary flow path 55 described above is connected to the bathtub 60 via the circulation pump 56. With this configuration, by operating the circulation pump 56, it is possible to heat the hot water in the bathtub 60 by flowing it through the secondary channel 55 to the water-to-water heat exchanger 50. That is, when reheating the hot water in the bathtub 60, the circulation pump 56 is operated, the hot water in the bathtub 60 is taken out to the secondary flow path 55, and flows into the water-to-water heat exchanger 50. The operation of exchanging heat with the hot water in the hot water storage tank 20 flowing in the pipe 45 of the primary flow path 51 passing through the water-to-water heat exchanger 50 and returning it to the bathtub 60 is repeatedly executed. The operation of the circulation pump 56 is also controlled by the control device S.

  In the middle part of the secondary channel 55, specifically, in this embodiment, the secondary channel 55 upstream of the bathtub 60 and downstream of the water-to-water heat exchanger 50 has a hot water supply pipe. The other end of 62 is connected. One end of the hot water supply pipe 62 is connected to a second mixing valve 75 described later, and an open / close valve 63 and a check valve 64 are interposed in the middle. The check valve 64 has a forward flow direction from one end connected to the second mixing valve 75 of the hot water supply pipe 62 to the other end connected to the secondary flow path 55.

  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 open at the upper part in the hot water storage tank 20, and the hot water in the hot water storage tank 20 can be taken out from here. This 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 branches into two branches, and one of the pipes 68A is connected to one inlet of the first mixing valve 70 described above. Has been.

  The first mixing valve 70 mixes tap water from the water supply pipe 41 and high-temperature water from the upper part of the hot water storage tank 20 to obtain hot water having a predetermined temperature, for example, + 36 ° C. to + 48 ° C. (or + 60 ° C.). It is a mixing valve to make hot water of ° C. A hot water supply pipe 74 is connected to the outlet of the first mixing valve 70, and the hot water adjusted by the first mixing valve 70 from the pipe 74 is used as hot water for hot water supply in a shower or kitchen other than the bathtub 60. Configured for use.

  On the other hand, the other branched pipe 68B is connected to one inlet of the second mixing valve 75 described above. The second mixing valve 75 mixes the tap water from the water supply pipe 41 with the 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. It is a valve. One end of the above-described hot water supply pipe 62 is connected to the outlet of the second mixing valve 75 so that hot water is supplied into the bathtub 60 via the pipe 62 and the secondary flow path 55. . The first and second mixing valves 70 and 75 are electrically variable mixing valves whose temperature is variable.

  The warm water adjusted to a predetermined temperature by the second mixing valve 75 is connected to the circulation pump 56 via the water-to-water heat exchanger 50 and the circulation pump 56 that is stopped by opening the on-off valve 63. It is supplied to the bathtub 60 without intervention, and the hot water filling operation in the bathtub 60 is performed.

  Further, the above-described pipe 69 is connected to an intermediate portion on the upstream side of the branch of the hot water supply pipe 68. 69V is a check valve provided in the pipe 69 and having a forward direction from one end side connected to the hot water supply pipe 68 side toward the water-to-water heat exchanger 50 side.

  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. Further, the secondary flow path 55 is provided with a temperature sensor S8 that detects the temperature of bathtub water (hot water) stored in the bathtub 60, and a water level sensor S9 that detects 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 44. 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. Furthermore, in the time zone other than the above, it is assumed that the hot water storage operation in which the remaining hot water amount is lower than 100L is started, and is controlled by the control device S to stop this 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 a control apparatus S composed of a microcomputer or the like. The control device S includes the sensors S1 to S9 described above, a bath remote controller (hereinafter referred to as “bath remote controller”) provided in the bathroom, and a kitchen remote controller (hereinafter referred to as “kitchen remote controller” provided in the kitchen). And the like, and the operation and frequency of the compressor 11 of the heat pump unit A, the operation of the circulation pumps 52 and 56, and the on-off valve 63 in accordance with the electric signal, the temperature signal, and the like based on the input information. Control of opening / closing, opening of the expansion valve 13, mixing amount of high temperature water and low temperature water (tap water in this embodiment) in each of the mixing valves 70 and 75 is executed.

  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 12 is compressed by the compression mechanism of the compressor 12 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 30 simultaneously with the start of the compressor 11 of the heat pump unit A. Thereby, the low temperature water (or cold water) in the lower part of the hot water storage tank 20 is taken out from the pipe 44 connected to the lower part of the hot water storage tank 20. At this time, the control device S controls the one-way inlet and the outlet of the three-way valve 32 to communicate with each other. Thereby, the low temperature water taken out from the lower part in the hot water storage tank 20 flows into the pipe 34 through the pipe 44, the pipe 31 and the three-way valve 32, and passes through the refrigerant-to-water heat exchanger 12. At this time, in the refrigerant-to-water heat exchanger 12, the low-temperature water flowing in the pipe 34 and the high-temperature refrigerant from the compressor 11 are heat-exchanged. 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 refrigerant-to-water heat exchanger 12 and having a high temperature repeats a cycle of returning to the upper part of the hot water storage tank 20 through the pipe 35.

  In the hot water storage operation in the midnight time zone, when the heating of the entire amount is completed (that is, in this embodiment, the temperature of the hot water taken out from the lower part of the hot water storage tank 20 detected by the temperature sensor S7 provided in the pipe 44 is predetermined). When the remaining hot water amount exceeds a predetermined value (for example, 150 L) in a time zone other than midnight, the controller S operates the compressor 11 of the heat pump unit A and the circulation pump. 33 is stopped and the hot water supply operation described above is terminated.

(2) Hot water filling operation Next, the operation of hot water filling the bathtub 60 will be described. For example, when the user presses a switch that executes a hot water filling operation of a bath remote control 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. At this time, the circulation pump 56 of the secondary flow path 55 remains stopped. Moreover, the amount of hot water taken out of the hot water storage tank 20 and the amount of the hot water so that hot water having a predetermined temperature (for example, + 42 ° C.) is generated by the second mixing valve 75 by the control device S and supplied to the bathtub 60 and Assume that the amount of tap water mixed with hot water 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 high temperature water flows into the second mixing valve 75 via the pipe 68B. The hot water from the hot water storage tank 20 is mixed with the tap water supplied from the pipe 71B through the pressure reducing valve 43 by the second mixing valve 75 to be heated to about + 42 ° C. Is supplied to the bathtub 60 through the water-to-water heat exchanger 50 and the stopped circulation pump 56 and without the circulation pump 56. When a predetermined amount of hot water is supplied to the bathtub 60, for example, when a predetermined amount of hot water is detected by the water level sensor S9 provided in the secondary channel 55, the control device S performs this hot water filling operation. finish.

(3) Re chasing operation On the other hand, when the switch for performing the chasing operation of the bath remote controller is pressed by the user, the control device S starts the chasing operation of the hot water in the bathtub 60. In this chasing operation, the control device S operates the circulation pump 52 of the primary flow path 51 and the circulation pump 56 of the secondary flow path 55. As a result, the hot water in the hot water storage tank 20 and the hot water in the bathtub 60 exchange heat with the water-to-water heat exchanger 50, and the hot water in the bathtub 60 can be tracked.

  Specifically, when the reheating operation is started (when each of the circulation 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 circulation pump 52 is water. It passes through the water heat exchanger 50. Similarly, the hot water in the bathtub 60 is taken out to the secondary flow path 55 by starting the circulation pump 56, and the hot water enters the water-to-water heat exchanger 50. As described above, the primary flow path 51 and the secondary flow path 55 are arranged in a heat exchange manner in the water-to-water heat exchanger 50, so that in the process of passing through the water-to-water heat exchanger 50, Hot water from the bathtub 60 flowing through the secondary flow path 55 is heated by exchanging heat with high-temperature water from the upper part of the hot water storage tank 20 flowing through the primary flow path 51 provided in heat exchange with the secondary flow path 55. . Then, the hot water heated by removing heat from the high-temperature water flowing through the primary flow path 51 in the water-to-water heat exchanger 50 exits the water-to-water heat exchanger 50 and returns 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 hot water flowing through the secondary flow path 55 in the water-to-water heat exchanger 50 is discharged from the water-to-water heat exchanger 50 and the hot water storage tank 20. The cycle of returning to the hot water storage tank 20 from below is repeated.

  When the temperature of the hot water in the bathtub 60 detected by the temperature sensor S8 provided in the secondary flow path 55 is increased to a predetermined temperature (for example, + 42 ° C.) by continuing the chasing operation described above, the control is performed. The device S stops the circulation pumps 52 and 56 and ends the chasing operation.

(4) Hot-water supply operation Next, the operation in the case of using hot water in a shower, a kitchen or the like, that is, the operation in the hot-water supply operation will be described. In this hot water supply operation, the control device S causes the first mixing valve 70 to set a predetermined temperature (a temperature set by the user using a shower, a remote controller of the kitchen, etc., for example, any temperature between + 36 ° C. and + 48 ° C., or , + 60 ° C.) hot water is generated, and the amount of hot water taken out from the hot water storage tank 20 and the amount of tap water mixed with the hot water are controlled so as to be supplied to a shower or kitchen etc. And

  When the user operates a shower or kitchen faucet, the controller S starts hot water supply. Also in this case, 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 as in the hot water filling operation described above. This high temperature water flows into the first mixing valve 70 through the pipe 68A.

  The high temperature water from the hot water storage tank 20 is mixed with the tap water supplied from the pipe 71A through the pressure reducing valve 43 by the first mixing valve 70, and a predetermined temperature set by the user (the above + 36 ° C.) is set. It is supplied to a shower, a kitchen or the like via a hot water supply pipe 74.

  By the way, in such a hot water supply apparatus H, when the low temperature water in the hot water storage tank 20 is heated and becomes high temperature water in the hot water storage operation described above, the volume of the water expands. Specifically, since the low-temperature water in the hot water storage tank 20 is heated by hot water storage operation to become high-temperature water, the volume expands by about 3%. 20 had to be discharged outside. In addition, if an air reservoir is provided in the hot water storage tank 20, problems such as corrosion occur, and therefore it is necessary to periodically vent the air accumulated inside. Therefore, in the conventional hot water supply device, a pressure relief valve is attached that opens when the temperature of the hot water in the hot water tank rises and the pressure in the hot water tank rises to a predetermined pressure value, and the volume expands from the upper part of the hot water tank by the valve. The amount of hot water that was spent was supposed to discharge overflow water. Further, during maintenance, the valve is manually opened periodically to vent the hot water tank. As described above, in the conventional hot water supply device, a pressure relief valve for discharging overflow water is attached to the upper part of the hot water storage tank, so that the valve also serves as an air vent in the hot water storage tank to reduce costs and save space. It was.

  However, in such a conventional configuration, the hot water discharged from the hot water storage tank is the upper high-temperature water having the highest temperature among the hot water in the hot water storage tank, which causes a problem of heat loss. Specifically, for example, when 460 L of low-temperature water (cold water) at + 20 ° C. is stored as high-temperature water at + 85 ° C., discarding the high-temperature water from the upper part of the hot water storage tank results in a heat loss of 897 kcal. In order to solve the problem of heat loss, it is desirable to discharge the low temperature water stored in the lower part of the hot water tank at the lowest temperature as overflow water. In this case, however, the pressure relief valve for taking out the overflow water is used. And a valve for venting air from the upper part of the hot water storage tank need to be provided separately, causing a problem of increasing the cost.

  In addition, there has been a development of a pressure relief valve for removing overflow water from the bottom and a valve for venting air. However, the control of the valve has become complicated, and a new control device is required to perform these controls. Therefore, there has been a problem that the cost is increased and a space for installing the control device is required. Further, the control device increases power consumption and causes a loss in the substrate, which causes a problem in terms of energy saving.

  Therefore, in the present invention, between the pressure relief valve of the hot water supply device and the hot water storage tank, a first inlet portion communicating with the upper portion in the tank, a second inlet portion communicating with the lower portion in the tank, a pressure relief valve, and A hot water storage tank having a constant pressure shut-off valve (pressure shut-off valve) having an outlet communicating with the second inlet and an on-off valve that opens and closes a passage between the first inlet and the second inlet When the internal pressure rises to a predetermined cutoff pressure value lower than a predetermined relief pressure value at which the pressure relief valve is opened, the passage between the first inlet portion and the second inlet portion is blocked by the constant pressure cutoff valve. Shall.

  Specifically, the present invention will be described by applying it to the hot water supply apparatus H of the present embodiment. 1 and 3, reference numeral 100 denotes a valve device according to this embodiment. FIG. 3 is an enlarged view of the valve device 100. The valve device 100 of the present embodiment is a device in which a pressure relief valve and a constant pressure shut-off valve (pressure shut-off valve) are configured integrally, and is interposed in the primary flow path 51. Specifically, 101 is a relief valve mechanism section as a pressure relief valve, and 110 is a constant pressure cutoff valve mechanism section as a constant pressure cutoff valve.

  The constant pressure shut-off valve mechanism part 110 is configured by a box body 111 having four openings, a first inlet part 112, a second inlet part 113, a mounting part 114, and an outlet part 115. The first inlet 112 is connected to a pipe 69 of the primary flow path 51 that communicates with the upper part of the hot water storage tank 20 described above. The second inlet 113 is connected to a pipe 45 of a primary flow path 51 that communicates with the lower part of the hot water storage tank 20 through a water-to-water heat exchanger 50.

  A substantially bowl-shaped cover body 116 is disposed on the attachment portion 114, and the outer peripheral portion of the cover body 116 is screwed to the outer peripheral edge of the attachment portion 114. That is, the attachment portion 114 of the box body 111 is closed by the cover body 116. An opening / closing valve portion 120 is provided on the inner surface (the surface on the mounting portion 114 side) of the cover body 116. The on-off valve portion 120 is a valve body for opening and closing the passage 125 between the first inlet portion 112 and the second inlet portion 113 in the box body 111, and covers the opening edge of the attachment portion 114. 117, a space formed between the cover body 116 and one surface of the diaphragm 117, a spring member 118 that urges the diaphragm 117 toward the box body 111, and the diaphragm 117, and the diaphragm 117 The shaft portion 121 is fixed, and is provided at the tip of the shaft portion 121 and includes an opening / closing portion 122 having a diameter larger than that of the shaft portion 121.

  One end of the shaft 121 is in a space formed between one surface of the diaphragm 117 and the cover body 116, and is disposed on the inner surface of the spring member 118, and extends from there to the diaphragm 117 side. While passing through the diaphragm 117, the other end (tip) is located in the box body 111 which is the other surface side of the diaphragm 117. The diaphragm 117 is urged by a spring member 118 on one surface, and the other surface located on the box body 111 side is always in communication with the second inlet portion 113, and the second inlet portion 113. Is biased in the direction opposite to the biasing force (spring force) of the spring member 118 by the pressure in the hot water storage tank 20 (lower part in the hot water storage tank 20).

  In this case, the on-off valve unit 120 is configured to block the passage 125 when the pressure in the hot water storage tank 20 from the second inlet 113 increases to a predetermined pressure value (cutoff pressure value). In this embodiment, the urging force of the spring member 118 that urges one surface side of the diaphragm 117 is the pressure in the hot water storage tank 20 from the second inlet portion 113 that urges the other surface side of the diaphragm 117. If the value is less than the value, the biasing force by the spring member 118 is superior, and if the pressure value is equal to or higher than the predetermined pressure value, the pressure in the hot water storage tank 20 is superior, and the diaphragm 117 resists the spring biasing force toward the spring member 118 side. It is set to be pressed.

  Specifically, the shaft 121 is pushed by the biasing force of the spring member 118 when the pressure in the hot water storage tank 20 from the second inlet 113 that biases the other surface side of the diaphragm 117 is less than a predetermined pressure value. It will be. Accordingly, as shown in FIG. 4, the opening / closing part 122 is separated from a part 125 </ b> A of the passage 125, so that the passage 125 is opened. On the other hand, when the pressure increases to a predetermined pressure value, as shown in FIG. 5, the diaphragm 117 is pushed toward the spring member 118 against the urging force of the spring member 118, and the shaft 121 fixed thereto is also the spring member 118. Will move to the side. As a result, the opening / closing part 122 comes into contact with a part 125A of the passage 125, and the passage 125 is blocked.

  The outlet 115 communicates with both the first inlet 112 and the second inlet 113 when the passage 125 is opened, and the outlet 115 is closed when the passage 125 is blocked. It is configured to communicate with only the two inlet portions 113. An attachment portion 115A extending outward from the box body 111 is provided around the outlet portion 115, and the attachment portion 115A is connected to the relief valve mechanism portion via a diaphragm 105 of the relief valve mechanism portion 101 described later. 101 is attached to the inlet 103. That is, the diaphragm 105 is fixed with a screw or the like with the outer peripheral edge held between the inlet portion 103 and the attachment portion 115A.

  The above-described relief valve mechanism 101 is a pressure relief valve that opens when the pressure in the hot water storage tank 20 rises to a predetermined relief pressure value. The relief valve mechanism 101 of this embodiment is connected to the constant pressure cutoff valve mechanism 110 corresponding to the outlet 115 of the constant pressure cutoff valve mechanism 110. In FIG. 3, reference numeral 102 denotes a box constituting the outline of the relief valve mechanism 101, 105 is a diaphragm, 106 is a shaft portion, 107 is provided around the shaft portion 106, and one end is attached to the holding portion 105 </ b> A of the diaphragm 105. The spring member 108 </ b> A for urging the holding portion 105 </ b> A toward the constant pressure shut-off valve mechanism 110 is a manual lever attached to the shaft portion 106.

  The box 102 includes three parts, an inlet part 103 corresponding to the outlet part 115 of the constant pressure shut-off valve mechanism part 110, a discharge part 104 communicating with the outside of the hot water storage tank 20, and an attachment part 108 for attaching the manual lever 108A. Has an opening. The opening edge of the inlet portion 103 is covered with the diaphragm 105 as described above. The shaft portion 106 has a circular hole (not shown) formed inside the diaphragm 105, and an inner side of the holding portion 105A attached to both sides of the hole (that is, one surface side and the other surface side of the diaphragm 105). It is provided so as to penetrate through the hole 105B formed in the. One end of the shaft portion 106 is located inside the outlet portion 115 of the constant pressure shut-off valve mechanism portion 110, and the diaphragm 105 and the holding portion 105A from each end 105B (the holes of the diaphragm 105 are not shown). Is inserted into the box body 102 of the relief valve mechanism 101 and the other end of the relief valve mechanism section 101 exits from the mounting section 108 and is located outside the box body 102.

  Further, a gap is formed between the hole of the diaphragm 105 and the shaft portion 106 inserted into the inside thereof, and the hole 105B of the holding portion 105A and the shaft portion 106 inserted into the inside thereof. Is a passage 109 described later for pressure relief. Further, a disc-shaped closing portion 106 </ b> A is provided at one end of the shaft portion 106. The closing portion 106A has a larger diameter than the hole 105B of the holding portion 105A. When the closing portion 106A comes into contact with the holding portion 105A, the hole 105B is closed by the closing portion 106A and the passage 109 is blocked. It is configured.

  The holding portion 105 </ b> A is attached to the inner peripheral edge of a hole formed inside the diaphragm 105 to hold the diaphragm 105. One surface of the holding portion 105A is urged toward the constant pressure cutoff valve mechanism 110 by the spring member 107, and the other surface facing the outlet 115 of the constant pressure cutoff valve mechanism 110 is the first of the constant pressure cutoff valve mechanism 110. The pressure in the hot water storage tank 20 from the second inlet 113 is biased toward the spring member 107 against the biasing force (spring force) of the spring member 107.

  In this case, when the pressure in the hot water storage tank 20 from the second inlet portion 113 urged from the other surface facing the outlet portion 115 rises to a predetermined pressure value (relief pressure value), the inlet portion 103 opens. It is opened and configured so that the pressure from the constant pressure shut-off valve mechanism 110 can flow into the relief valve mechanism 101.

  Specifically, in the present embodiment, the outlet portion 115 side (inside the constant pressure shut-off valve mechanism portion 110) and the box 102 are formed by the passage 109 formed between the shaft portion 106 and the holding portion 105A located on the outer periphery thereof. It is configured to communicate with the inside. In this case, when the pressure in the hot water storage tank 20 is lower than a predetermined pressure value (relief pressure value), the biasing force of the spring is set so that the biasing force of the spring member 107 is greater than the pressure in the hot water storage tank 20. Yes. Accordingly, the holding portion 105A is urged toward the outlet portion 115 side (constant pressure cutoff valve mechanism portion 110 side) by the urging force of the spring member 107, and comes into contact with one surface of the closing portion 106A. Thereby, the hole 105B of the holding portion 105A is closed by the closing portion 106A, and the passage 109 is blocked.

  On the other hand, when the pressure in the hot water storage tank 20 rises above a predetermined pressure value (relief pressure value), the pressure in the hot water storage tank 20 prevails over the urging force of the spring member 107, and the closure attached to one end of the shaft portion 106. The portion 106 is pushed against the urging force of the spring member 107 by the pressure, and is separated from the holding portion 105A. As a result, the hole 105B of the holding portion 105A is opened and the passage 109 is opened. The relief pressure value is set to be a predetermined value higher than the above-described shutoff pressure value of the constant pressure shutoff valve mechanism 110.

  The passage 109 can also be opened by operating the lever 108A. In this embodiment, when the lever 108A attached to the other end of the shaft portion 106 is operated, the shaft portion 106 moves to the constant pressure shut-off valve mechanism portion 110 side, and a closing portion located at the tip of the shaft portion 106. It is assumed that 106A and the holding portion 105A are separated from each other and the passage 109 is opened.

  As described above, when the passage 109 is opened, the constant pressure cutoff valve mechanism 110 and the relief valve mechanism 101 communicate with each other. As described above, the relief pressure value is set to a predetermined value higher than the above-described shut-off pressure value of the constant pressure shut-off valve mechanism portion 110, so that the closing portion 106A is attached to the spring member 107 by the pressure in the hot water storage tank 20. When the passage 109 is opened by being pushed against the force (that is, when the passage 109 is not opened manually by the lever 108A), the upper part of the hot water storage tank 20 from the first inlet 112 is used. However, only the pressure from the lower part of the hot water storage tank 20 from the second inlet 113 flows into the relief valve mechanism 101 without entering the relief valve mechanism 101.

  On the other hand, when the shaft portion 106 is pushed toward the constant pressure shut-off valve mechanism portion 110 by manual operation with the lever 108A to open the passage 109, and the pressure in the hot water storage tank 20 is lower than the predetermined shut-off pressure value. Since the passage between the first inlet portion 112 and the second inlet portion 113 is in an open state, the pressure inside the hot water storage tank 20 flows into the relief valve mechanism portion 101 via the passage 109. Can be discharged to the outside.

  The operation of the valve device 100 will be specifically described with the above configuration. In this embodiment, it is assumed that the manual lever 108A is operated at the time of maintenance of the hot water supply apparatus H and at the time of stoppage of the hot water supply apparatus H. That is, in the present embodiment, the passage is opened during the hot water storage operation only when the pressure in the hot water storage tank 20 rises to a predetermined relief pressure value higher than the cutoff pressure value.

  When the temperature of the hot water in the hot water storage tank 20 rises and the volume expands due to the hot water storage operation described above, and the pressure in the hot water storage tank 20 rises to a predetermined pressure value (cutoff pressure value), as shown in FIG. Is pushed toward the spring member 118 against the biasing force of the spring member 118, and the shaft portion 121 also moves toward the spring member 118. As a result, the opening / closing part 122 abuts on a part 125A of the passage 125 (that is, the part 125A of the passage 125 is blocked by the opening / closing part 122), and the passage 125 is blocked.

  Further, when the pressure in the hot water storage tank 20 rises and rises to a predetermined pressure value (relief pressure value) higher than the shut-off pressure value, the holding portion 105A is pushed against the urging force of the spring member 107 and is closed. It leaves | separates from the part 106A. Thereby, the passage 109 is opened, and the inside of the constant pressure cutoff valve mechanism 110 and the inside of the relief valve mechanism 101 are communicated.

  As a result, low-temperature water from the lower part of the hot water storage tank 20 that has flowed into the constant pressure shut-off valve mechanism part 110 from the second inlet part 113 passes through the outlet part 115 and the relief valve mechanism part 101, and the relief valve mechanism part 101. It is discharged from the discharge unit 104 to the outside.

  When the low temperature water (overflow water) corresponding to the volume expansion is discharged from the discharge portion 104 and the pressure in the hot water storage tank 20 is reduced below a predetermined relief pressure value, the holding portion 105A is moved by the urging force of the spring member 107. It is pushed and abuts against the closing portion 106A, and the passage 109 is closed.

  In this way, when the pressure in the hot water storage tank 20 rises to a predetermined relief pressure value, the passage 109 of the relief valve mechanism 101 is opened, so that the inflow from the second inlet 113 of the constant pressure shut-off valve mechanism 110 is introduced. The low temperature water in the lower part of the tank 20 can be discarded to the outside.

  At this time, as described above, when the on-off valve portion 120 of the constant pressure shut-off valve mechanism 110 rises to a predetermined shut-off pressure value lower than the relief pressure value, the first inlet portion 112 and the second inlet portion 113. Since the passage 125 is blocked, the low-temperature water in the lower portion of the tank 20 can be reliably discharged as overflow water without discharging the high-temperature water in the upper portion of the hot water storage tank 20 from the first inlet portion 112. . Therefore, the above-described conventional heat loss problem can be solved or minimized.

  On the other hand, at the time of maintenance of the hot water supply apparatus H, by operating the lever 108A, the shaft portion 106 moves to the constant pressure cutoff valve mechanism portion 110 side, and the closing portion 106A and the holding portion 105A located at the tip of the shaft portion 106 are moved. In order to leave, the passage 109 is opened. Thereby, the inside of the constant-pressure cutoff valve mechanism part 110 and the relief valve mechanism part 101 are connected. At this time, since the passage 125 between the first inlet portion 112 and the second inlet portion 113 is in an open state, the upper portion of the hot water storage tank 20 is passed through the first inlet portion 112 and the outlet portion 115. Therefore, the air accumulated in the upper part of the hot water storage tank 20 can be discharged from the discharge portion 104. Therefore, according to the hot water supply apparatus H of the present invention, both discharge of overflow water from the lower part of the hot water storage tank 20 and air bleeding from the upper part of the hot water storage tank 20 can be performed without any trouble.

  In particular, according to the present invention, it is possible to discharge overflow water from the lower part of the hot water storage tank 20 and to release air from the upper part of the hot water storage tank 20 by a simple valve mechanism, so that no special control device for controlling the valve is required. Thus, the cost can be greatly reduced.

  Furthermore, the relief valve mechanism 101 and the constant pressure cutoff valve are connected to the constant pressure cutoff valve mechanism 110 corresponding to the outlet 115 of the constant pressure cutoff valve mechanism 110 as in this embodiment. Since the mechanism unit 110 can be configured integrally, installation space can be reduced. Thereby, the space efficiency of the hot water supply device H can be improved.

  In the present embodiment, the constant pressure shut-off valve mechanism 110 serving as the constant pressure shut-off valve as described above and the relief valve mechanism 101 serving as the pressure relief valve are integrally configured. However, the present invention is not limited thereto. The constant pressure cutoff valve and the pressure relief valve may be configured separately. In this case, the outlet portion of the constant pressure shut-off valve and the second inlet portion are combined, and a middle portion of the pipe connected to the second inlet portion is branched, and one of them is the lower part of the hot water storage tank. And the other to the pressure relief valve.

  In the hot water supply apparatus H of the above embodiment shown in FIG. 1, the valve apparatus 100 is interposed in the primary flow path 51, specifically, between the pipe 69 and the pipe 45 connected to the hot water supply pipe 68. However, the position of the valve device 100 is not limited to the position of the above embodiment. For example, as shown in FIG. 6, the present invention is effective even if a valve device 100 is interposed in the hot water supply pipe 68. In FIG. 6, those denoted by the same reference numerals as those in FIGS. 1 to 5 have the same or similar effects or actions, and thus the operation and description are omitted.

  In this case, the first inlet 112 of the constant pressure cutoff valve mechanism 110 is connected to the upper part of the hot water storage tank 20 via the hot water supply pipe 68. A pipe 45 of the primary flow path 51 is connected to a middle portion of the hot water supply pipe 68 connected to the second inlet 113. Further, the hot water supply pipe 68 connected to the second inlet 113 is bifurcated on the downstream side of the connection of the pipe 45 in the same manner as in the above embodiment, and one pipe 68A is connected to the first mixing valve 70. The other pipe 68B is connected to one inlet of the second mixing valve 75.

  Furthermore, the present invention is not limited to the system circuit described above, but can be applied to other system circuits. In the following embodiments, examples thereof will be briefly described. In addition, in each of FIGS. 7 to 11, the same reference numerals as those in FIGS. 1 to 6 have the same or similar effects or actions, and therefore the operation and description are omitted.

  FIG. 7 shows an example in which the present invention is applied to a hot water supply apparatus H in which a hot water supply pipe 68A and a hot water supply pipe 68 are separately provided. In the hot water supply apparatus H of the first embodiment, the hot water supply pipe 68 is branched, one of which is a pipe 68A for hot water supply, and the other is a pipe 68B for the bathtub 60 for filling the bathtub 60 with hot water. . That is, the hot water supply apparatus H of the first embodiment is one that takes out the hot water in the upper part of the hot water storage tank 20 from the hot water supply pipe 68 regardless of whether it is hot water supply or hot water filling of the bathtub 60. On the other hand, in the hot water supply apparatus H shown in FIG. 7, a pipe 68A is provided in the upper part of the hot water storage tank 20 separately from the hot water supply pipe 68, and when hot water is supplied, the upper part in the hot water storage tank 20 is connected to the pipe 68A. The high-temperature water can be taken out.

  When the present invention is applied to the hot water supply apparatus H of the present embodiment, for example, when the valve apparatus 100 shown in FIG. 3 is attached, the primary connected to the middle portion of the hot water supply pipe 68 as in the first embodiment. It can be provided between the pipe 69 and the pipe 45 of the flow path 51 (FIG. 7).

  In addition, as shown in FIG. 8, the valve device 100 may be provided in the hot water supply pipe 68. In this case, the first inlet 112 of the constant pressure cutoff valve mechanism 110 is connected to the upper part of the hot water storage tank 20 via the hot water supply pipe 68. A pipe 45 of the primary flow path 51 is connected to a middle portion of the hot water supply pipe 68 connected to the second inlet 113. Furthermore, the hot water supply pipe 68 connected to the second inlet 113 is connected to one inlet of the second mixing valve 75 via the pipe 68B.

  Further, FIG. 9 and FIG. 10 include a third mixing valve 65 for mixing the hot water in the hot water storage tank 20 and the intermediate temperature water having a temperature lower than that in the first mixing valve 70 for hot water supply. It is an example when the present invention is applied to the hot water supply apparatus H. In this case, one inlet of the third mixing valve 65 is connected to an extraction pipe 66A for taking out high-temperature water from the upper part of the hot water storage tank 20, and the other inlet is connected to the hot water storage tank 20 from an intermediate portion of the hot water storage tank 20. A take-out piping 66B for taking out the medium-temperature water having a temperature lower than that of the high-temperature water taken out from the upper part is connected. Also, the outlet of the third mixing valve 65 is connected to a pipe 68A that reaches one inlet of the first mixing valve 70 as described above.

  The third mixing valve 65 mixes the hot water taken out from the take-out pipe 66A and the medium-temperature water taken out from the take-out pipe 66B, and has a relatively high temperature set in advance, for example, hot water of about + 65 ° C. This is a mixing valve.

  And when applying this invention to the hot water supply apparatus H of this Example, for example, when attaching the valve apparatus 100 shown in FIG. 3, like the said Example 1, it is connected to the middle part of the hot water supply piping 68. FIG. Further, it can be provided between the pipe 69 and the pipe 45 of the primary flow path 51 (FIG. 9). Further, as shown in FIG. 10, the valve device 100 can be interposed in the hot water supply pipe 68. In FIG. 10, the first inlet 112 of the constant pressure shut-off valve mechanism 110 is connected to the upper part of the hot water storage tank 20 via the hot water supply pipe 68. A pipe 45 of the primary flow path 51 is connected to a middle portion of the hot water supply pipe 68 connected to the second inlet 113. Furthermore, the hot water supply pipe 68 connected to the second inlet 113 is connected to one inlet of the second mixing valve 75 via the pipe 68B.

  On the other hand, the present invention can be applied to a case where a dedicated pipe as shown in FIG. 11 is provided and the valve device 100 is interposed in the pipe without providing a valve device in the pipe of the existing hot water supply apparatus H as in the above-described embodiments. Is valid. In this case, the first inlet 112 of the constant pressure shut-off valve mechanism 110 of the valve device 100 is connected to the upper part of the hot water storage tank 20 via the pipe 90, and the second inlet 113 is connected to the hot water storage tank 20 via the pipe 91. Connected to the bottom of the. In the present embodiment shown in FIG. 11, the primary flow path 51 is a flow path different from a pipe for taking out high-temperature water for hot water supply or for filling the bathtub 60 with hot water. That is, the piping 90, the piping 45 of the primary flow path 51, the extraction piping 66A, and the piping 35 of the hot water generation circuit 30 are connected to the upper part of the hot water storage tank 20.

  The extraction pipe 66 </ b> A is connected to one inlet of the third mixing valve 65. As described in the fourth embodiment, the third mixing valve 65 mixes the hot water in the hot water storage tank 20 with the medium-temperature water having a temperature lower than that to set a relatively high temperature, for example, +65. This is a self-mixing mixing valve for making hot water at about ℃. The other inlet of the mixing valve 65 is connected to an extraction pipe 66B connected to the intermediate portion of the hot water storage tank 20. Further, a hot water supply pipe 68 is connected to the outlet of the third mixing valve 65.

  Thus, by providing the dedicated pipes 90 and 91 and providing the valve device 100 in the pipes 90 and 91, the hot water storage tank 20 is not affected without affecting the hot water supply operation or the reheating operation of the hot water supply device H. It becomes possible to discharge low temperature water as overflow water from the lower part of the inside. Specifically, for example, when the valve device 100 is interposed in the primary flow path 51 as shown in FIG. 1, the hot water returning to the hot water storage tank 20 through the water-to-water heat exchanger 50 during the reheating operation is not Since the temperature is higher than that of water, the pipe 45 is connected so that the hot water from the primary flow path 51 returns to the hot water storage tank 20 above the connection position of the water supply pipe 41. For this reason, when the valve device 100 is interposed in the primary flow path 51, the temperature of the hot water taken out as the overflow water from the pipe 45 becomes high. That is, the temperature of the hot water discharged as overflow water depends on the connection position of the pipe 45.

  However, by providing a dedicated pipe as in the present embodiment, it is possible to connect the pipe 91 below the connection position of the pipe 45, and it is possible to take out hot water of lower temperature from the hot water storage tank 20 and discharge it. It becomes.

  In each of the above embodiments, the present invention has been described by applying 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 of claims 1 and 2 are not limited to the heat pump type hot water supply device, and it is effective to apply the present invention to a hot water supply device that generates hot water by 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 block diagram of the valve apparatus of a present Example. It is a figure which shows the state by which the channel | path was open | released by the on-off valve part of the constant pressure cutoff valve (constant pressure cutoff valve mechanism part) of the valve apparatus of FIG. It is a figure which shows the state by which the channel | path was interrupted | blocked by the on-off valve part of the constant pressure cutoff valve (constant pressure cutoff valve mechanism part) of the valve apparatus of FIG. It is a system circuit diagram of the whole hot-water supply apparatus of the 2nd Example of this invention (Example 2). It is a system circuit diagram of the whole hot-water supply apparatus of the 3rd Example of this invention (Example 3). It is a system circuit diagram of the whole hot-water supply apparatus of another 3rd Example of this invention. It is a system circuit diagram of the whole hot-water supply apparatus of the 4th Example of this invention (Example 4). It is a system circuit diagram of the whole hot-water supply apparatus of another 4th Example of this invention. It is a system circuit diagram of the whole hot-water supply apparatus of the 5th Example of this invention (Example 5).

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 32 Three-way valve 33 Circulation pump 41, 44 Piping 42 Check valve 43 Pressure reducing valve 44V Valve device 50 Water-to-water heat exchanger 51 Primary flow path 52 Circulating pump 55 Secondary flow path 56 Circulating pump 60 Bathtub 63 On-off valve 64 Check valve 70 First mixing Valve 74 Hot water supply pipe 75 Second mixing valve 100 Valve device 101 Relief valve mechanism (pressure relief valve)
DESCRIPTION OF SYMBOLS 102 Box 103 Inlet part 104 Discharge part 105 Diaphragm 105A Holding part 105B Hole 106 Shaft part 106A Closure part 107 Spring member 108A Manual lever 109 Passage 110 Constant pressure cutoff valve mechanism part (constant pressure cutoff valve)
DESCRIPTION OF SYMBOLS 111 Box body 112 1st inlet part 113 2nd inlet part 114 Attachment part 115 Outlet part 115A Attachment part 117 Diaphragm 118 Spring member 120 On-off valve part 121 Shaft part 122 Open / close part 125 Passage

Claims (3)

A hot water supply apparatus comprising a pressure relief valve that generates hot water in a hot water storage tank and opens when the pressure in the hot water storage tank rises to a predetermined relief pressure value,
A pressure shut-off valve interposed between the pressure relief valve and the hot water storage tank;
The pressure shut-off valve includes a first inlet portion communicating with the upper portion in the tank, a second inlet portion communicating with the lower portion in the tank, and an outlet portion communicating with the pressure relief valve and the second inlet portion. And an open / close valve portion that opens and closes a passage between the first inlet portion and the second inlet portion,
The on-off valve portion shuts off a passage between the first inlet portion and the second inlet portion when the pressure in the hot water storage tank rises to a predetermined cutoff pressure value lower than the escape pressure value. Hot water supply device characterized by.   The hot water supply apparatus according to claim 1, wherein the pressure relief valve is connected to the pressure cutoff valve corresponding to an outlet portion of the pressure cutoff valve.   The hot water supply device according to claim 1 or 2, wherein 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. .

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