Hot water supply storage tank assembly and heat pump water heater

Abstract

The invention provides a hot water supply storage tank assembly and a heat pump water heater, which can prevent water from being sprayed on an electric loop arranged below a liquid discharge plate even if a water discharge port of the liquid discharge plate is blocked and water in the liquid discharge plate overflows. A hot water supply tank assembly (3) is provided with: a hot water supply tank (12) mounted on a bottom plate (85) of a tank (81); a water circuit (41) housed above the hot water supply tank (12) in the case (81); a drain tray (82) disposed between the water circuit (41) and the hot water supply tank (12); and a control unit (6) which is housed below the liquid discharge tray (82) in the case (81) and which is close to any one of the plurality of side plates. The drain tray (82) has a bulging section (151) that is closer to at least one of the other side plates (88) among the plurality of side plates (88), and a non-bulging section (152) that is farther from the at least one of the other side plates (88) than the bulging section (151). Water overflowing from the liquid discharge tray (82) is guided to the lower side in the box body (81) through a water overflowing path (153), which is a gap between the non-bulging part (152) and the side plate (88).

Description

Technical Field

[0001] Embodiments of the present invention relate to a hot water supply storage tank assembly and a heat pump water heater. Background Art

[0002] A known water heater includes: a storage tank; a main frame body disposed directly above the storage tank and supporting a circuit for heating a heat medium using a heat pump; and a support plate sandwiched between the storage tank and the main frame body to support the main frame body. The support plate has: a recessed portion provided at a position closer to the inside than a receiving portion for supporting the main frame body, for receiving drainage from various devices and pipes through which water supplied to the upper part thereof flows; and a drain port opened at the lowest part of the recessed portion and penetrating the support plate. The drain port is connected to a drain pipe for discharging the drainage to the outside of the water heater.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: European Patent Application Publication No. 3462103 Specification Summary of the Invention

[0006] Technical Problem to be Solved by the Invention

[0007] If the drain port of the support plate or the drain pipe is blocked, the drainage accumulated in the recessed portion of the support plate overflows from the periphery of the support plate. When an electrical circuit is disposed at a position lower than the support plate, the water overflowing from the support plate wets the electrical circuit below the support plate, hindering the normal operation of the water heater.

[0008] Therefore, an object of the present invention is to provide a hot water supply storage tank assembly and a heat pump water heater that can prevent water from dripping onto an electrical circuit disposed below a drain pan even if the drain port of the drain pan is blocked and water in the drain pan overflows.

[0009] Solution for Solving the Above Technical Problem

[0010] In order to solve the above technical problems, the hot water supply storage tank assembly according to an embodiment of the present invention includes: a box body having a bottom plate, a frame body having a plurality of column members erected from the bottom plate, and a plurality of side plates erected between adjacent column members; a hot water supply storage tank mounted on the bottom plate and received in the lower side of the box body; a water circuit received in the box body above the hot water supply storage tank for water to flow; a drain pan disposed between the water circuit and the hot water supply storage tank and supported by the frame body and the hot water supply storage tank; and an electrical circuit received in the box body below the drain pan and close to any one of the plurality of side plates. The drain pan has a bulging portion close to at least one other of the plurality of side plates and a non-bulging portion farther from the at least one other side plate than the bulging portion. Water overflowing from the drain pan is guided to the lower side of the box body through a gap between the non-bulging portion of the drain pan and the side plate, that is, an overflow water path.

[0011] Preferably, the water circuit of the hot water supply storage tank assembly according to an embodiment of the present invention includes: a water heat exchanger for performing heat exchange between a refrigerant and the water; and a circulation circuit for the water that has undergone heat exchange in the water heat exchanger to flow.

[0012] Preferably, the hot water supply storage tank assembly according to an embodiment of the present invention includes: a refrigerant circuit disposed directly above the drain pan for the refrigerant that has undergone heat exchange in the water heat exchanger to flow.

[0013] Preferably, the drain pan of the hot water supply storage tank assembly according to an embodiment of the present invention is a molded product of a foaming material and has a gap between the bulging portion and the side plate.

[0014] Preferably, the electrical circuit of the hot water supply storage tank assembly according to an embodiment of the present invention is disposed on the front surface, and the overflow water path is disposed on at least one of the back surface, the right side surface, and the left side surface.

[0015] Preferably, the drain pan of the hot water supply storage tank assembly according to an embodiment of the present invention has an upstream overflow water path disposed in the non-bulging portion and communicating with the overflow water path for guiding the water accumulated in the drain pan to the overflow water path.

[0016] Preferably, the hot water supply storage tank assembly according to an embodiment of the present invention includes: the bottom plate having a handle opening; a resin handle disposed in the box body and provided in the handle opening; a metal handle cover disposed in the box body and covering the handle; and a fastening member for fixing the handle cover to the handle.

[0017] Advantages of the Invention

[0018] According to the present invention, it is possible to provide a hot water supply storage tank assembly and a heat pump water heater that can prevent water from splashing onto the electrical circuit disposed below the drain pan even if the drain opening of the drain pan is clogged and the water in the drain pan overflows. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. is a system configuration diagram of a heat pump water heater according to an embodiment of the present invention.

[0020] Figure 2 FIG. is a perspective view of a hot water supply storage tank assembly according to an embodiment of the present invention.

[0021] Figure 3 FIG. is a rear view of a hot water supply storage tank assembly according to an embodiment of the present invention.

[0022] Figure 4 FIG. is a perspective view of a hot water supply storage tank assembly according to an embodiment of the present invention, showing the outer plate removed.

[0023] Figure 5 FIG. is a perspective view of a hot water supply storage tank assembly according to an embodiment of the present invention, showing the outer plate, refrigerant circuit, and heat medium circulation circuit removed.

[0024] Figure 6 FIG. is a top cross-sectional view of the box body and drain pan of a hot water supply storage tank assembly according to an embodiment of the present invention.

[0025] Figure 7 FIG. is a partial perspective view of the box body and drain pan of a hot water supply storage tank assembly according to an embodiment of the present invention.

[0026] Figure 8 FIG. is a longitudinal cross-sectional view of the drain pan and hot water supply storage tank of a hot water supply storage tank assembly according to an embodiment of the present invention.

[0027] Figure 9 FIG. is a top view of the bottom plate of a hot water supply storage tank assembly according to an embodiment of the present invention.

[0028] Figure 10 FIG. is a perspective view of the bottom plate of a hot water supply storage tank assembly according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] REFERENCE IS MADE TO Figures 1 to 10 to describe embodiments of the hot water supply storage tank assembly and heat pump water heater of the present invention. In addition, in the multiple drawings, the same or corresponding components are labeled with the same reference numerals.

[0030] Figure 1 FIG. is a system configuration diagram of a heat pump water heater according to an embodiment of the present invention.

[0031] AS Figure 1As shown, the heat pump water heater 1 of the present embodiment heats the water supply supplied from outside the machine using the heat of the outdoor air into hot water and stores it in the hot water supply storage tank 12, and supplies the hot water in the hot water supply storage tank 12 to the outside of the machine as needed. In addition, the water supply supplied from outside the machine is generally tap water supplied through a water pipe.

[0032] The heat pump water heater 1 includes: an outdoor unit 2 (Outdoor Unit) as a heat source component, which exchanges heat between outdoor air and a refrigerant; a hot water supply storage tank component 3, which exchanges heat between the circulating water as the heat medium on the utilization side and the refrigerant, and exchanges heat between the circulating water and the water supply to boil the water supply into hot water; a remote controller 5 as an input device, which receives the operation of the user; and a control unit 6, which controls the outdoor unit 2 and the hot water supply storage tank component 3 based on the operation input to the remote controller 5. In addition, the circulating water as the heat medium on the utilization side is not limited to water, and other heat media such as antifreeze can also be used.

[0033] The heat pump water heater 1 circulates the refrigerant between the outdoor unit 2 and the hot water supply storage tank component 3, uses the water heat exchanger 11 in the hot water supply storage tank component 3 to exchange heat between the refrigerant and the circulating water, and exchanges heat between the circulating water and the water supply in the hot water supply storage tank 12 in the hot water supply storage tank component 3.

[0034] The circulating water circulating in the hot water supply storage tank component 3 is used for heating the water supply stored in the hot water supply storage tank 12, that is, boiling. The hot water, which is the water supply heated in the hot water supply storage tank 12, is supplied to hot water supply targets such as a washroom, a kitchen, and a bathroom.

[0035] Generally, the outdoor unit 2 is installed outdoors, and the hot water supply storage tank component 3 is installed indoors. The outdoor unit 2 and the hot water supply storage tank component 3 are connected by the cross-connecting pipes 15, 16 of the refrigerant pipe 13 and a communication line (not shown). That is, only the refrigerant flows between the outdoor unit 2 and the hot water supply storage tank component 3, and the heat pump water heater 1 does not require a pipe through which the outdoor water supply passes. Therefore, the heat pump water heater 1 can avoid the freezing of the water in the outdoor pipe through which the water supply passes in winter.

[0036] In addition, the heat pump water heater 1 heats the circulating water and circulates the circulating water at a first temperature, for example, from 40 degrees Celsius to 50 degrees Celsius, to the external device 21 without passing through the hot water supply storage tank 12. The external device 21 is, for example, a heat dissipation device 22 (radiator 22) of a floor heating system or an indoor unit 23 of an air conditioning system. The highest temperature of the first temperature depends on the type of refrigerant. When the R410A refrigerant circulates between the outdoor unit 2 and the hot water supply storage tank component 3, the first temperature reaches about 55 degrees Celsius at most. In addition, if the R32 refrigerant or the CO2 refrigerant is used, the first temperature can be made higher.

[0037] Furthermore, the heat pump water heater 1 can store hot water at a second temperature higher than the first temperature, for example, about 70 degrees Celsius, in the hot water supply storage tank 12 by combining the heat exchange between the refrigerant and the circulating water performed by the water heat exchanger 11 and the heating of the water supply performed by the standby heater 31 provided downstream of the water heat exchanger 1 in the hot water supply storage tank assembly 3.

[0038] The heat pump water heater 1 is provided with a refrigerant circuit 32. The heat source of the refrigerant circuit 32 is the outdoor air. The refrigerant circuit 32 includes: a compressor 35 that compresses and discharges the refrigerant; an air heat exchanger 36 as an evaporator; an expansion valve 37; a water heat exchanger 11 as a condenser; and a refrigerant pipe 13 that connects the compressor 35, the air heat exchanger 36, the expansion valve 37, and the water heat exchanger 11 to allow the refrigerant to flow. The water heat exchanger 11 is a plate-type heat exchanger or a heat exchanger such as a double pipe that performs heat exchange between the refrigerant and the circulating water. The refrigerant circuit 32 transfers heat by the refrigerant circulating from the air heat exchanger 36 as the low-temperature part to the water heat exchanger 11 as the high-temperature part. The refrigerant circuit 32 uses the heat of the high-temperature refrigerant flowing in the water heat exchanger 11 to heat the circulating water.

[0039] In addition, the refrigerant circuit 32 includes: a four-way valve 38 that delivers the refrigerant discharged from the compressor 35 to either the air heat exchanger 36 or the water heat exchanger 11, and delivers the refrigerant that has passed through the other of the air heat exchanger 36 and the water heat exchanger 11 back to the compressor 35 again; and a liquid receiver 39 provided in the refrigerant pipe 13 between the four-way valve 38 and the compressor 35.

[0040] A part of the water heat exchanger 11 and the refrigerant pipe 13 is housed in the hot water supply storage tank assembly 3. The components of the refrigerant circuit 32 other than a part of the water heat exchanger 11, the refrigerant pipe 13, and the crossover pipes 15 and 16 are housed in the outdoor assembly 2.

[0041] When heating the circulating water in the refrigerant circuit 32, the air heat exchanger 36 functions as an evaporator (also referred to as a "heat absorber"), and the water heat exchanger 11 functions as a condenser (also referred to as a "radiator").

[0042] The compressor 35 compresses, boosts the pressure of, and discharges the refrigerant. Preferably, the operating frequency of the compressor 35 can be changed by a known inverter control. If the rotational speed of the compressor 35 is increased, the amount of heat transferred to the high-temperature part increases, and if the rotational speed of the compressor 35 is decreased, the amount of heat transferred to the high-temperature part decreases.

[0043] The expansion valve 37 is, for example, an electronic expansion valve (Pulse Motor Valve, PMV) capable of adjusting the valve opening degree.

[0044] The refrigerant pipe 13 connects the compressor 35, the accumulator 39, the four-way valve 38, the air heat exchanger 36, the expansion valve 37, and the water heat exchanger 11.

[0045] The four-way valve 38 switches the flow direction of the refrigerant circulating in the compressor 35, the air heat exchanger 36, the expansion valve 37, and the water heat exchanger 11. When heating the circulating water in the refrigerant circuit 32, the four-way valve 38 causes the refrigerant discharged from the compressor 35 to flow in the order of the water heat exchanger 11, the expansion valve 37, and the air heat exchanger 36 ( Figure 1 in the flow of the refrigerant shown by the solid line).

[0046] When heating the circulating water, the refrigerant circuit 32 in which the refrigerant circulates discharges the compressed high-temperature and high-pressure refrigerant from the compressor 35. This refrigerant is transported to the hot water supply storage tank assembly 3 via the four-way valve 38 and the crossover pipe 15 and enters the water heat exchanger 11. The water heat exchanger 11 heats the circulating water passing through the water heat exchanger 11 by using the refrigerant passing through the water heat exchanger 11. The refrigerant that has heated the circulating water in the water heat exchanger 11 is cooled and becomes a high-pressure liquid state. That is, when using the refrigerant to heat the circulating water, the water heat exchanger 11 functions as a radiator. The refrigerant that has passed through the water heat exchanger 11 returns to the outdoor assembly 2 via the crossover pipe 16, is decompressed by the expansion valve 37, becomes a low-pressure gas-liquid two-phase refrigerant, and reaches the air heat exchanger 36. An external gas is ventilated to the air heat exchanger 36 by a blower (not shown). The outdoor air ventilated in the air heat exchanger 36 heats the refrigerant passing through the air heat exchanger 36. At this time, the air heat exchanger 36 functions as a heat absorber that evaporates the refrigerant into a gas state. The refrigerant that has become a gas phase through the air heat exchanger 36 is sucked into the compressor 35.

[0047] When the external air temperature becomes low, frost forms on the surface of the outdoor air heat exchanger 36. Therefore, the refrigerant circuit 32 uses the four-way valve 38 to switch the flow direction of the refrigerant in the refrigerant pipe 13 and performs a defrosting operation. When performing the defrosting operation, the heat pump water heater 1 reverses the four-way valve 38 to generate a refrigerant flow in the refrigerant circuit 32 that is opposite to the flow of the refrigerant for heating the circulating water. In the case of the defrosting operation, the four-way valve 38 causes the refrigerant discharged from the compressor 35 to flow in the order of the air heat exchanger 36, the expansion valve 37, and the water heat exchanger 11 ( Figure 1 in the flow of the refrigerant shown by the dashed line).

[0048] During the defrost operation, the air heat exchanger 36 functions as a condenser, and the water heat exchanger 11 functions as an evaporator. The heat pump water heater 1 cools the circulating water by circulating the refrigerant in the same direction as the defrost operation, and extracts heat from the water supply in the hot water supply storage tank 12. However, the occurrence frequency of the defrost operation is low, and the duration of the defrost operation is a short period of about 10 minutes. Therefore, the defrost operation only slightly reduces the temperature of the water stored in the hot water supply storage tank 12, and does not have a great impact on the utilization of hot water.

[0049] The hot water supply storage tank assembly 3 includes: a water heat exchanger 11, which is a part of the refrigerant circuit 32 and heats the circulating water by using the circulating refrigerant; a hot water supply storage tank 12, which can store about 100 to 200 liters of water; and a heat medium circulation circuit 41 as a water circuit, which circulates the circulating water heated by the water heat exchanger 11 between the water heat exchanger 11 and the hot water supply storage tank 12. The hot water supply storage tank assembly 3 is also referred to as a water heat exchange assembly (Hydro Unit).

[0050] The heat medium circulation circuit 41 includes: the utilization side of the water heat exchanger 11; a circulating water pipe 42, which allows the circulating water as the utilization side heat medium to flow; a first pump 43, which circulates the circulating water; a standby heater 31, which further heats the circulating water in addition to the heat exchange using the water heat exchanger 11; an expansion tank 45, which absorbs the expansion (increase in volume) of the heated circulating water; and a flow sensor 46, which measures the flow rate of the circulating water and outputs it to the control unit 6. The circulating water circulates unidirectionally in the heat medium circulation circuit 41.

[0051] The circulating water heated by the water heat exchanger 11 is sucked into the driven first pump 43 and discharged to the hot water supply storage tank 12. The circulating water whose temperature is reduced by heating the water supply in the hot water supply storage tank 12 is returned to the water heat exchanger 11. The circulating water returned to the water heat exchanger 11 is heated again by the refrigerant circulating in the refrigerant circuit 32. The circulating water heated by the water heat exchanger 11 is sucked into the first pump 43 again.

[0052] The hot water supply storage tank 12 stores the hot water, which is the water supply boiled by the circulating water circulating in the heat medium circulation circuit 41, and supplies the hot water to faucets, showers, etc. according to the user's requirements. The hot water supply storage tank 12 includes: a storage tank 51 made of stainless steel material, which can store the water supply; a water supply pipe 53, which has an outlet 52 disposed at the bottom of the storage tank 51 and flows the water supply into the storage tank 51; a coil pipe 55, which is disposed in the storage tank 51 and allows the circulating water for heating the water supply in the storage tank 51 to flow; a hot water supply pipe 56, which guides the hot water, which is the water supply heated in the storage tank 51, outside the storage tank 51; and a heat insulation member 58, which covers the outer surface of the storage tank 51.

[0053] The storage tank 51 is an airtight container except for the hot water supply pipe 56 and the water supply pipe 53. When supplying hot water to a hot water supply target which is the connection target of the hot water supply pipe 56, water supply is replenished from the water supply pipe 53 into the storage tank 51 in a manner to supplement the supplied hot water volume. Therefore, the storage tank 51 always remains full of water. The hot water supply pipe 56 for supplying the hot water in the storage tank 51 is provided at the top of the storage tank 51. Generally, the hot water supply storage tank 12 supplies the hot water in the storage tank 51 to the hot water supply target by the water pressure of tap water acting on the tap water pipe which is the connection target of the water supply pipe 53. Therefore, the same amount of water supply as the hot water supplied through the hot water supply pipe 56 is replenished from the water supply pipe 53 into the storage tank 51.

[0054] The coil pipe 55 has: a circulating water introduction part 55a which passes through the upper head 122 serving as the top of the storage tank 51 in the vertical direction and enters the storage tank 51, and extends linearly downward in the storage tank 51; a spiral part 55b which is continuously wound in a spiral shape with the circulating water introduction part 55a; and a circulating water return part 55c which extends linearly upward in the storage tank 51 from the terminal of the spiral part 55b, passes through the upper head 122 in the vertical direction, and protrudes outside the storage tank 51.

[0055] An insulating member 58 for suppressing direct heat dissipation to the atmosphere and preventing the temperature of the hot water in the storage tank 51 from decreasing is provided around the hot water supply storage tank 12. The material of the insulating member 58 is a styrofoam material or a polyurethane foam material having a higher heat insulation performance than the styrofoam material. In addition, a vacuum insulating member with even higher heat insulation performance can also be used. In addition, the insulating member is not provided at the lower part of the storage tank 51 where the necessity of heat preservation is low.

[0056] The heat pump water heater 1 is provided with, in addition to a temperature sensor (not shown) for measuring the representative value of the temperature of the hot water in the storage tank 51, a sensor group (not shown) which includes various temperature sensors required for controlling the operation of the refrigerant circuit 32 and the boiling of the hot water in the hot water supply storage tank 12.

[0057] The circulating water pipeline 42 has: a liquid supply pipe 61 which conveys the circulating water heated by the water heat exchanger 11 to the coil pipe 55 of the hot water supply storage tank 12; and a liquid return pipe 62 which returns the circulating water whose temperature has been reduced after heating the water supply in the storage tank 51 by the coil pipe 55 from the hot water supply storage tank 12 to the water heat exchanger 11. The first pump 43, the standby heater 31, and the expansion tank 45 are provided in the middle of the liquid supply pipe 61. The flow sensor 46 is provided in the middle of the liquid return pipe 62.

[0058] In addition, the heat medium circulation loop 41 includes an external circulation loop 65 that circulates the circulating water to the external device 21. The external circulation loop 65 includes: an external circulating water pipe 66 that branches the circulating water from the circulating water pipe 42 to the external device 21 and returns the circulating water used in the external device 21 to the circulating water pipe 42; a three-way valve 67 that switches the circulation path of the circulating water to either the hot water supply storage tank 12 side or the external device 21 side; a second pump 68 that transports the circulating water toward the indoor unit 23; and a mixing valve 69 that mixes a part of the circulating water used in the indoor unit 23 with the circulating water toward the indoor unit 23.

[0059] The external circulating water pipe 66 includes an external liquid supply pipe 71 that branches the circulating water from the circulating water pipe 42 to the external device 21 and an external liquid return pipe 72 that returns the circulating water used in the external device 21 to the circulating water pipe 42.

[0060] The heated circulating water used in the external device 21 is transported to the external device 21 through the external liquid supply pipe 71 of the external circulation loop 65 that branches from the liquid supply pipe 61 of the heat medium circulation loop 41 between the water heat exchanger 11 and the hot water supply storage tank 12. The external liquid supply pipe 71 further branches into a first liquid supply pipe 71a that transports the circulating water to the heat dissipation device 22 and a second liquid supply pipe 71b that transports the circulating water to the indoor unit 23.

[0061] The circulating water after being used in the external device 21 returns to the liquid return pipe 62 of the heat medium circulation loop 41 between the hot water supply storage tank 12 and the water heat exchanger 11 through the external liquid return pipe 72 of the external circulation loop 65. The external liquid return pipe 72 combines the first liquid return pipe 72a that returns the circulating water from the heat dissipation device 22 and the second liquid return pipe 72b that returns the circulating water from the indoor unit 23.

[0062] The three-way valve 67 joins the external liquid return pipe 72 of the external circulating water pipe 66 to the liquid return pipe 62 of the heat medium circulation loop 41. The three-way valve 67 connects the return side of the external liquid return pipe 72 of the external circulating water pipe 66 and the return side of the hot water supply storage tank 12 of the circulating water pipe 42 to the inlet side of the circulating water of the water heat exchanger 11. The three-way valve 67 alternatively switches either the flow of the circulating water from the hot water supply storage tank 12 toward the water heat exchanger 11 or the flow of the circulating water from the external device 21 toward the water heat exchanger 11. Through the switching of the three-way valve 67, the circulation path of the circulating water is set to either the hot water supply storage tank 12 side or the external device 21 side.

[0063] The mixing valve 69 connects the upstream side of the second pump 68 of the second liquid supply pipe 71b to the middle of the second liquid return pipe 72b.

[0064] The mixing valve 69 varies the mixing amount of the circulating water directed towards the indoor unit 23 and the circulating water returning from the indoor unit 23, and controls the temperature of the circulating water flowing through the indoor unit 23 to meet the temperature requirements set for the indoor unit 23. Additionally, in the present embodiment, the heat pump water heater 1 is capable of supplying hot water to two external devices 21 (22, 23), but the external device 21 may also be one. Furthermore, the heat pump water heater 1 may also be a water heater dedicated to hot water supply that does not have the ability to supply hot water to the external device 21.

[0065] There is at least one remote controller 5. The remote controller 5 may also include, for example, a remote controller provided on the hot water supply storage tank assembly 3 and a remote controller (not shown) provided on, for example, the indoor wall surface.

[0066] As Figure 2 shown, the remote controller 5 of the hot water supply storage tank assembly 3 of the present embodiment is provided at the center of the front surface of the hot water supply storage tank assembly 3. The remote controller 5 is an input device capable of inputting the boiling set temperature of the hot water in the hot water supply storage tank 12. Furthermore, the remote controller 5 can also input the set temperature of the circulating water circulated to the external device 21. The remote controller 5 sends the boiling set temperature of the hot water in the hot water supply storage tank 12 and the set temperature of the circulating water circulated to the external device 21 as control signals to the control unit 6.

[0067] The control unit 6 includes a microprocessor (not shown) and a storage device (not shown) that stores various arithmetic programs, parameters, etc. executed by the microprocessor. The control unit 6 is an electrical circuit installed on an electrical circuit board (not shown). The control unit 6 reads various control programs from the auxiliary storage device into the main storage device, and the central arithmetic processing unit executes the various control programs read into the main storage device.

[0068] In addition, the control unit 6 performs the operation control of the heat pump water heater 1 based on the control signals received from the remote controller 5 through a wired or wireless communication circuit and the output of the sensor group, including the operation of the refrigerant circuit 32 and the operation of the first pump 43 of the heat medium circulation circuit 41. For example, the control unit 6 performs the operation control of the heat pump water heater 1 so that the measured temperature of the temperature sensor in the storage tank 51 becomes the boiling set temperature of the hot water in the hot water supply storage tank 12.

[0069] Furthermore, the control unit 6 switches the circulation path of the circulating water to either the hot water supply storage tank 12 or the external device 21 through the switching control of the three-way valve 67, or alternately switches the circulation path of the circulating water to either the hot water supply storage tank 12 or the external device 21 to balance the boiling of the hot water in the hot water supply storage tank 12 and the supply of the circulating water to the external device 21. The remote controller 5 preferably has the switching function of these operation states.

[0070] On Figure 1 this basis, asFigures 2 to 5 As shown in the figure, the hot water supply storage tank assembly 3 of the present embodiment includes: a longitudinally long rectangular parallelepiped-shaped box body 81; a hot water supply storage tank 12 stored in the lower side of the box body 81; a water heat exchanger 11 stored above the hot water supply storage tank 12 in the box body 81; a part of the refrigerant circuit 32 stored above the hot water supply storage tank 12 in the box body 81 for the refrigerant flowing through the water heat exchanger 11 to circulate; and a heat medium circulation circuit 41 stored above the hot water supply storage tank 12 in the box body 81 for the circulating water flowing through the water heat exchanger 11 to circulate.

[0071] In addition, as Figure 4 and Figure 5 shown, the hot water supply storage tank assembly 3 includes a water heat exchanger 11, a part of the refrigerant circuit 32, and a drain pan 82 disposed between the heat medium circulation circuit 41 and the hot water supply storage tank 12.

[0072] The box body 81 includes: four support legs 83 provided at four corners of the box body 81 for supporting the hot water supply storage tank assembly 3 on the installation surface; a bottom plate 85 supported by the four support legs 83 and opposed to the installation surface of the hot water supply storage tank assembly 3; and a frame body 86 supported by the bottom plate 85 and erected upward. In addition, as Figure 2 and Figure 3 shown, the box body 81 includes a top plate 87 opposed to the bottom plate 85, and four side plates 88 spanned between the bottom plate 85 and the top plate 87. And, as Figure 4 and Figure 5 shown, the box body 81 includes an electrical circuit box fixing plate 89 between the hot water supply storage tank 12 and the side plate 88. Based on the installation state of the hot water supply storage tank assembly 3, the shape of the box body 81 observed from above the box body 81, that is, the planar shape of the box body 81, is a rectangle having four sides: a front surface, a back surface, a right side surface, and a left side surface. The planar shapes of the bottom plate 85 and the top plate 87 are rectangles. In order to maintain the strength of the box body 81, the top plate 87, the bottom plate 85, and the four side plates 88 are made of steel plates. The plate thickness becomes thicker in the order of the side plate 88, the top plate 87, and the bottom plate 85 that require strength.

[0073] Each support leg 83 protrudes downward from each corner of the lower surface of the rectangular bottom plate 85. The four support legs 83 are grounded on an installation surface such as the indoor floor to support the hot water supply storage tank assembly 3. Each support leg 83 preferably includes a mechanism capable of adjusting the height in the vertical direction of the box body 81, for example, a mechanism capable of ascending and descending in the vertical direction by screws. By adjusting the height of each support leg 83, it is easy to adjust the grounding posture of the hot water supply storage tank assembly 3. Therefore, it is possible to easily set the hot water supply storage tank assembly 3 so that the center line C of the storage tank 51 is vertically erected and the bottom plate 85 and the top plate 87 are horizontal.

[0074] The bottom plate 85 covers the bottom surface of the box body 81. The bottom plate 85 supports the entire box body 81 on the installation surface via the support legs 83.

[0075] As Figure 4 and Figure 5 shown, the frame body 86 has a frame (Rahmen) structure in which a plurality of column members 91 and a plurality of beam members 92 are rigidly joined by fastening members such as screws (not shown). Each column member 91 is a so-called angle steel having the same L-shaped cross section in the longitudinal direction. Each beam member 92 is a sheet metal formed product having the same C-shaped cross section in the longitudinal direction. The frame body 86 has four column members 91 that substantially stand upright from each corner of the upper surface of the rectangular bottom plate 85 and a plurality of beam members 92 that are substantially horizontally spanned between adjacent column members 91.

[0076] The four column members 91 are a front right column member 91fr disposed at the front right edge portion of the box body 81, a front left column member 91fl disposed at the front left edge portion, a rear right column member 91br disposed at the rear right edge portion, and a rear left column member 91bl disposed at the rear left edge portion.

[0077] The plurality of beam members 92 include: two upper front beam members 92fu and 92fd spanned between the two front column members 91fr and 91fl; two upper rear beam members 92bu and 92bd spanned between the two rear column members 91br and 91bl; two upper right beam members 92ru and 92rd spanned between the two right column members 91fr and 91br; and two upper left beam members 92lu and 92ld spanned between the two left column members 91fl and 91bl. The plurality of beam members 92 are disposed above the hot water supply storage tank 12 and the drain pan 82.

[0078] The upper right beam member 92ru is spanned between the top of the front right column member 91fr and the top of the rear right column member 91br. The upper left beam member 92lu is spanned between the top of the front left column member 91fl and the top of the rear left column member 91bl.

[0079] The lower right beam member 92rd is disposed below the upper right beam member 92ru, and the lower left beam member 92ld is disposed below the upper left beam member 92lu. The lower right beam member 92rd and the lower left beam member 92ld are substantially parallelly disposed at the same height with reference to the bottom surface of the box body 81.

[0080] The upper front beam member 92fu is disposed below the upper right beam member 92ru and the upper left beam member 92lu and above the lower right beam member 92rd and the lower left beam member 92ld.

[0081] The upper rear beam member 92bu is installed between the top of the rear right column member 91br and the top of the rear left column member 91bl. The upper rear beam member 92bu, the upper right beam member 92ru, and the upper left beam member 92lu are substantially parallel and arranged at the same height with respect to the bottom surface of the box body 81.

[0082] The lower front beam member 92fd and the lower rear beam member 92bd are arranged below the lower right beam member 92rd and the lower left beam member 92ld, and are substantially parallel and arranged at the same height position with respect to the bottom surface of the box body 81.

[0083] The top plate 87 covers the top surface of the box body 81. The top plate 87 has a plurality of through holes 101 for allowing a plurality of pipes 15, 16, 53, 56, 71a, 71b, 72a, and 72b to project individually from the inside of the box body 81 to the outside. The plurality of through holes 101 are arranged near the edge of the top plate 87 that defines the rear surface 81b of the box body 81 and are arranged in the width direction of the box body 81. Each pipe has a connection port 102 exposed to the outside of the box body 81. Each connection port 102 is a joint that can be connected to the crossover pipes 15 and 16 of the refrigerant circuit 32 or the water pipes 53, 56, 71a, 71b, and 72a leading to the outside of the hot water supply storage tank assembly 3.

[0084] The four side plates 88 covering the side surfaces of the box body 81 are a front plate 88f covering the front surface of the box body 81, a rear plate 88b covering the rear surface of the box body 81, a right plate 88r covering the right side surface of the box body 81, and a left plate 88l covering the left side surface of the box body 81. Each side plate 88 is a flat panel made of sheet metal. The shape of each side plate 88 is a rectangular shape having a long side in the vertical direction of the hot water supply storage tank assembly 3 and a short side in the horizontal direction.

[0085] The top plate 87, the bottom plate 85, and the surrounding side plates 88 are collectively referred to as exterior components. The bottom plate 85 forms the bottom surface that serves as the reference surface of the hot water supply storage tank assembly 3. The front, rear, left, and right column members 91 are firmly fixed to the bottom plate 85 by fastening members. Each beam member 92 is fixed to the front, rear, left, and right column members 91 by fastening members. Each side plate 88 is fixed to the front, rear, left, and right column members 91 by fastening members. The top plate 87 is fixed to the side plates 88 by fastening members. The fastening members can be screws or a combination of bolts and nuts. During assembly, the bottom plate 85 is fixed to the front, rear, left, and right column members 91, each beam member 92 is fixed to the front, rear, left, and right column members 91, each side plate 88 is fixed to the front, rear, left, and right column members 91, and the top plate 87 is fixed to the side plates 88. By performing in the reverse order, the box body 81 can be disassembled. Additionally, the top plate 87 can be fixed only to the front, rear, left, and right column members 91 instead of being fixed to the side plates 88. Thus, the side plates 88 can be easily removed from the front, rear, left, and right column members 91 without removing the top plate 87.

[0086] If the fastening members of one or more parts of the fixed side plate 88 are removed from the hot water supply storage tank assembly 3, the side plate 88 can be removed from the hot water supply storage tank assembly 3 to become Figure 4 and Figure 5 the state shown. By removing the side plate 88 from the hot water supply storage tank assembly 3, it is easy to perform inspection operations and confirmation operations on various devices inside the hot water supply storage tank assembly 3.

[0087] The electrical circuit box fixing plate 89 is formed by bending a part of a flat sheet metal plate. The electrical circuit box fixing plate 89 faces any one of the four side plates 88, which is the front plate 88f in this embodiment. The electrical circuit box fixing plate 89 is located between the hot water supply storage tank 12 and the front plate 88f. The electrical circuit box fixing plate 89 is fixed to the front beam member 92fd and the two front column members 91fr and 91fl on its left and right by fastening members such as screws. The front surface of the electrical circuit box fixing plate 89 faces the inner surface of the front plate 88f. The lower end portion of the electrical circuit box fixing plate 89 is fixed to the bottom plate 85 by a fastening member. The upper end portion of the back surface of the electrical circuit box fixing plate 89 faces the drain pan 82.

[0088] Here, the space above the upper surface of the drain pan 82 is called the machinery room 111. The electrical circuit box fixing plate 89 divides the space below the upper surface of the drain pan 82 in the box body 81 into two front and rear spaces. The space behind the electrical circuit box fixing plate 89 is called the storage tank room 112 for storing the hot water supply storage tank 12 and the drain pan 82. The space in front of the electrical circuit box fixing plate 89 is called the electrical room 113. The storage tank room 112 and the electrical room 113 are adjacent to each other in the front-rear direction of the box body 81 with the electrical circuit box fixing plate 89 in between below the machinery room 111. The electrical room 113 is the space between the front plate 88f and the electrical circuit box fixing plate 89, and the storage tank room 112 is the space between the electrical circuit box fixing plate 89 and the back plate 88b. The storage tank room 112 is a space with a larger capacity than the electrical room 113.

[0089] The hot water supply storage tank 12 is mounted on the substantially central part of the bottom plate 85. The storage tank 51 of the hot water supply storage tank 12 is a so-called cylindrical storage tank. The hot water supply storage tank 12 is arranged in such a way that the center line C of the storage tank 51 is erected in the vertical direction. In the installed state of the hot water supply storage tank 12, the extending direction of the center line C of the storage tank 51 is substantially the same as the height direction of the hot water supply storage tank 12, the height direction of the box body 81, and the height direction of the hot water supply storage tank assembly 3.

[0090] The storage tank 51 is fixed to the substantially central part of the bottom plate 85 and is housed inside the hot water supply storage tank assembly 3.

[0091] The storage tank 51 includes a lower head 121 disposed near the bottom plate 85, an upper head 122 covered by a drain pan 82, a cylindrical main body portion 123 connecting the lower head 121 and the upper head 122, and an annular leg portion 125 supporting the lower head 121 on the bottom plate 85. The lower head 121 has a dome shape protruding downward, the upper head 122 has a dome shape protruding upward, and the main body portion 123 is a cylinder extending in the vertical direction with substantially the same diameter. The center line C of the storage tank 51 substantially coincides with the center line of the main body portion 123. The lower head 121, the upper head 122, and the main body portion 123 are made of stainless steel material. The plate thickness of the lower head 121, the plate thickness of the upper head 122, and the plate thickness of the main body portion 123 are substantially the same. The boundary portion between the main body portion 123 and the lower head 121 and the boundary portion between the main body portion 123 and the upper head 122 are hermetically welded respectively.

[0092] The plane orthogonal to the center line C of the hot water supply storage tank 12 is substantially the horizontal plane in the installation state of the hot water supply storage tank 12. The cross-sectional shapes of the lower head 121, the upper head 122, and the main body portion 123 in this plane are substantially circular. The bottom plate 85, the top plate 87 are substantially orthogonal to the center line C of the hot water supply storage tank 12, and the side plate 88 is substantially parallel to the center line C of the hot water supply storage tank 12.

[0093] In the height direction of the storage tank 51, the main body portion 123 is longer than the lower head 121 and the upper head 122. In addition, the height dimension of the storage tank 51 is larger than the diameter dimension of the storage tank 51. In other words, the storage tank 51 is a longitudinally long cylindrical storage tank.

[0094] The leg portion 125 is welded to the outer surface of the lower head 121 which is the bottom surface of the storage tank 51. The leg portion 125 is a circle with a diameter smaller than the maximum diameter of the lower head 121. The leg portion 125 is fixed to the bottom plate 85 via a plurality of angle steels (not shown) having an L-shaped cross section and a plurality of fastening members (not shown), such as bolts. The leg portion 125 may integrally have a tongue equivalent to the angle steel. That is, the angle steel may be absent.

[0095] The water heat exchanger 11 is housed in the machine room 111. The water heat exchanger 11 is disposed near the inner surface of either the left or right side surface of the box body 81, which is the left side surface in this embodiment. The water heat exchanger 11 having an appearance in the shape of a plate is mounted along the inner surface of the left side surface of the box body 81 so as to expand in the vertical and front-rear directions of the box body 81. The water heat exchanger 11 is fixed to the upper left beam member 92lu and the lower left beam member 92ld by a plurality of fastening members such as bolts.

[0096] A part of the refrigerant circuit 32 housed in the machinery room 111 is a part of the refrigerant pipe 13 that is connected to the crossover pipes 15 and 16 to allow the refrigerant to flow into the water heat exchanger 11. A part of the refrigerant circuit 32 includes a passage inside the water heat exchanger 11 through which the refrigerant flows.

[0097] The heat medium circulation circuit 41 housed in the machinery room 111 includes a first pump 43, a flow sensor 46, an expansion tank 45, and a circulating water pipe 42 that connects them. In addition, the heat medium circulation circuit 41 housed in the machinery room 111 includes an external circulation circuit 65, namely, a three-way valve 67, a mixing valve 69, a second pump 68, and an external circulating water pipe 66.

[0098] The standby heater 31 of the heat medium circulation circuit 41 is arranged in the electrical room 113 below the drain pan 82. The standby heater 31 is located on the side of the hot water supply storage tank 12 in the height direction of the cabinet 81, arranged on the right side of the electrical room 113 and close to the right front corner of the cabinet 81, and faces the inner surface of the front plate 88f and the inner surface of the right plate 88r. When viewed from above, the standby heater 31 is arranged between the corner of the hot water supply storage tank 12 with a circular outer shape and the cabinet 81 with a rectangular inner space, avoiding the approaching part between the hot water supply storage tank 12 and the side plate 88.

[0099] The electric circuit board on which the control unit 6 is installed is housed in a rectangular parallelepiped-shaped electric circuit box 131. The electric circuit box 131 is housed in the electrical room 113 located at the front side inside the cabinet 81.

[0100] The electric circuit box 131 is a flat rectangular parallelepiped-shaped box along the front-rear direction of the cabinet 81. The front surface of the electric circuit box 131 faces the inner surface of the front plate 88f, and the back surface of the electric circuit box 131 faces the front surface of the electric circuit box fixing plate 89. The electric circuit box 131 is made of sheet metal. The electric circuit box 131 has a flange portion that is hooked on the beam member 92fd and fixed to the beam member 92fd by fastening members such as screws. By removing the fastening members and releasing the hooking of the flange portion, the electric circuit box 131 can be removed from the hot water supply storage tank assembly 3. When removing the electric component box 131, since the flange portion is hooked on the beam member 92fd, the electric component box 131 will not fall even if the fastening members are removed, making the disassembly operation of the electric component box 131 easier. The electric circuit box 131 is wider than the standby heater 31 housed adjacent to the electrical room 113 and occupies most of the upper half space of the electrical room 113. In addition, the electric circuit box 131 can be opened and closed forward with respect to the cabinet 81, enabling easy inspection, repair, or replacement operations of the internal electric circuit board without removing it from the hot water supply storage tank assembly 3.

[0101] Next, use Figures 6 to 8Describe the structure of the drain pan 82 in detail. The drain pan 82 is disposed below the plurality of beam members 92 of the frame 86.

[0102] The drain pan 82 of the hot water supply storage tank assembly 3 of the present embodiment is placed and supported on the hot water supply storage tank 12. In the front-rear direction of the box body 81, the drain pan 82 has a small gap between it and the adjacent two column members 91 and the electrical circuit box fixing plate 89. The large movement (position deviation) of the drain pan 82 in the front-rear, left-right directions of the box body 81 due to contact with the electrical circuit box fixing plate 89 or any one of the column members 91 when an external force is applied to the drain pan 82 is restricted.

[0103] In addition, in the up-down direction of the box body 81, the drain pan 82 is mounted on the top of the storage tank 51 of the hot water supply storage tank 12 and covers the upper head 122 of the storage tank 51. The drain pan 82 is supported by the upper head 122 of the storage tank 51. The load acting on the drain pan 82 from top to bottom is transmitted in the drain pan 82 and supported by the hot water supply storage tank 12.

[0104] As Figure 8 shown, the drain pan 82 is also a part of the heat insulating member 58 of the storage tank 51. The material of the drain pan 82 uses expanded polystyrene material or expanded polyurethane material with higher heat insulating performance than the expanded polystyrene material. In addition, surface treatment is applied to the part of the upper surface of the drain pan 82 for receiving drain liquid to prevent moisture from invading the inside of the expanded polystyrene, expanded polyurethane material, etc. The drain pan 82 has: an inner bottom surface 82b1 with a curved surface shape that is in seamless contact with the top of the storage tank 51, i.e., the upwardly convex dome-shaped upper head 122; and an outer bottom surface 82b2 with an annular shape that is in seamless contact with the annular upper surface of the main body heat insulating part 132. In addition, the porous body 58a filling the gap between the drain pan 82 and the main body heat insulating part 132 can be sandwiched between the drain pan 82 and the main body heat insulating part 132.

[0105] The upper surface of the drain pan 82 faces the lower surface of the top plate 87. The upper surface of the drain pan 82 corresponds to the bottom surface of the mechanical chamber 111.

[0106] And, as Figure 6 and Figure 7 shown, the peripheral edge portions 141 around the upper surface of the drain pan 82 in the front-rear, left-right directions protrude more upward than the enclosed area inside it. The upper end surfaces of the peripheral edge portions 141 are substantially on the same horizontal plane in the installed state of the hot water supply storage tank assembly 3. The area enclosed by the peripheral edge portions 141 on the upper surface of the drain pan 82 and closed is the part for collecting drain liquid, called the drain receiving recess 142. The peripheral edge portions 141 correspond to the dikes around the drain receiving recess 142 to prevent the moisture accumulated in the drain receiving recess 142 from overflowing from the drain pan 82.

[0107] The drain pan 82 uses the drain receiving recess 142 to receive the water dripping from the heat exchanger 11, refrigerant pipes 13, circulating water pipes 42, external circulating water pipes 66, etc., including the heat exchangers, pipes, and valves arranged in the machine room 111. The water dripping from these devices is the water that condenses on the surface of the devices or the water leaking from the circuit. Therefore, the drain receiving recess 142 preferably includes the entire area directly below the devices, pipes, and valves arranged in the machine room 111.

[0108] The drain pan 82 covering the top of the hot water supply storage tank 12 has a plurality of pipe arrangement holes 143 through which a plurality of pipes connected to the storage tank 51 pass respectively. The plurality of pipes connected to the storage tank 51 are at least one of the water supply pipe 53, the hot water supply pipe 56, the liquid delivery pipe 61, and the circulating water introduction part 55a of the coil 55, and at least one of the external return liquid pipe 72 and the circulating water return part 55c of the coil 55. Each pipe arrangement hole 143 is arranged in the drain receiving recess 142. In addition, the lower end of each pipe arrangement hole 143 is blocked by the storage tank 51.

[0109] In addition, from Figure 7 it can be seen that the drain pan 82 is also a support platform for supporting the second pump 68. The sheet metal box for housing the first pump 43 and other devices arranged on the upper surface of the drain pan 82 is fixed to either the beam member 92 or the column member 91. The drain pan 82 has a plurality of convex portions 145 for separating the distance between the devices and the drained liquid, and guiding the drained liquid falling from the devices to a lower position in the drain receiving recess 142 so that these devices do not come into contact with the drained liquid accumulated in the drain receiving recess 142. The plurality of convex portions 145 are arranged in the drain receiving recess 142. The protruding height of the plurality of convex portions 145 can be higher than the protruding height of the edge portion 141 of the drain pan 82, or can be lower than the protruding height of the edge portion 141 of the drain pan 82. In addition, the plurality of convex portions 145 can be connected to the lower part of the edge portion 141 of the drain pan 82, or can protrude into the drain receiving recess 142 like isolated islands.

[0110] In addition, the drain pan 82 has a drain hole 146 for discharging the drained liquid accumulated in the drain receiving recess 142. The drain hole 146 penetrates the bottom of the drain pan 82. The drain hole 146 is preferably provided at the lowest part of the drain receiving recess 142. The drain receiving recess 142 preferably slopes downward as a whole towards the drain hole 146. The lower end of the drain hole 146 is connected to a flexible drain pipe 147 ( Figure 7 ) for discharging the water accumulated in the drain pan 82 to the outside of the hot water supply storage tank assembly 3. As Figure 3 shown by the double-dot dash line, the drain pipe 147 hangs down to the outside of the box body 81 through the opening 148 provided in the back plate 88b. Preferably, the lower end (front end) of the drain pipe 147 can be connected to the drainage equipment provided at the installation site of the hot water supply storage tank assembly 3.

[0111] However, if the drain hole 146 or the drain pipe 147 is blocked by foreign matter, the drained liquid accumulates in the drain receiving recess 142. When the amount of the drained water accumulated in the drain receiving recess 142 exceeds the allowable amount of the drain receiving recess 142, the drained liquid overflows from the drain tray 82. Since the heat pump water heater 1 is generally installed indoors, when the drained liquid overflowing from the drain tray 82 leaks indoors, problems such as wetting the floor may occur. Therefore, it is desirable that the overflowed drained liquid flows down within the cabinet 81 and is further received by the bottom plate 85.

[0112] However, if the flow path of the drained liquid flowing from the drain tray 82 to the bottom plate 85 is uncertain, there is a possibility that the electrical circuit box 131 located below the drain tray 82 is wetted by water. When the electrical circuit box 131 is wetted by water, the electrical circuit in the electrical circuit box 131, that is, the control unit 6, is wetted by water and short-circuited in the middle of the conduction path, resulting in the heat pump water heater 1 no longer operating.

[0113] Therefore, as Figure 6 and Figure 7 shown, the drain tray 82 of the hot water supply storage tank assembly 3 of the present embodiment includes: a plurality of bulging portions 151 protruding in the direction of the left and right side plates 88 so as to approach the side plates 88 except for the front side where the electrical component box 131 is installed; and a plurality of non-bulging portions 152 that are farther from the side plates 88 than the bulging portions 151. The hot water supply storage tank assembly 3 causes the water overflowing from the drain tray 82 to flow downward inside the cabinet 81 through the gap, that is, the overflow water path 153, between the non-bulging portion 152 of the drain tray 82 and the side plate 88, and guides it to the bottom plate 85. That is, the drain tray 82 has an upstream overflow water path 155, which is provided in the non-bulging portion 152 and communicates with the overflow water path 153, and guides the water accumulated in the drain tray 82 to the overflow water path 153.

[0114] The plurality of bulging portions 151 are continuous with the edge portion 141 of the drain tray 82 and protrude in a direction away from the drain receiving recess 142. The plurality of bulging portions 151 include a right bulging portion 151r provided on the right side surface of the drain tray 82 and a left bulging portion 151l provided on the left side surface of the drain tray 82. In the horizontal direction of the cabinet 81, the right bulging portion 151r is arranged at the central portion of the right side surface of the drain tray 82, and the left bulging portion 151l is arranged at the central portion of the left side surface of the drain tray 82. The right bulging portion 151r is close to the inner surface of the right plate 88r, and the left bulging portion 151l is close to the inner surface of the left plate 88l. Each bulging portion 151 follows the inner surface of the flat side plate 88 and has an end surface substantially parallel to the inner surface of the side plate 88. The gap size between the side plate 88 close to the bulging portion 151 and the bulging portion 151 is preferably less than 10 mm, and can be about 4 mm, for example. A slight gap is provided to eliminate the noise generated by the friction between the two due to the expansion and contraction caused by the difference in the temperature expansion rate between the metal side plate 88 and the drain tray 82 made of a foamed member.

[0115] The non-bulging portion 152 is adjacent to the bulging portion 151 and is farther from the inner surface of the side plate 88 than the bulging portion 151. The non-bulging portion 152 includes a right front non-bulging portion 152rf on the front side of the right side surface of the drain pan 82, a right rear non-bulging portion 152rb on the rear side of the right side surface of the drain pan 82, a left front non-bulging portion 152lf on the front side of the left side surface of the drain pan 82, and a left rear non-bulging portion 152lb on the rear side of the left side surface of the drain pan 82. The non-bulging portions 152rf and 152rb on the right side face the inner surface of the right plate 88r, and the non-bulging portions 152lf and 152lb on the left side face the inner surface of the left plate 88l. Each non-bulging portion 152 follows the inner surface of the flat side plate 88 and has an end face substantially parallel to the inner surface of the side plate 88. The clearance dimension between the side plate 88 facing the non-bulging portion 152 and the non-bulging portion 152 is preferably 10 mm or more, and can be about 12.5 mm, for example.

[0116] The plurality of bulging portions 151 and the plurality of non-bulging portions 152 are the left and right side surfaces of the drain pan 82 facing the inside of the left and right side plates 88. The bulging portion 151 and the non-bulging portion 152 can be continuously formed in a sloped shape or can be connected as a single-stage or multi-stage stepped shape.

[0117] The clearance between the side plate 88 facing the non-bulging portion 152 and the non-bulging portion 152 is the overflow water path 153. That is, the overflow water path 153 is arranged inside the right side surface and the left side surface of the box body 81. The overflow water path 153 includes a right front overflow water path 153rf on the front inner side of the right side surface of the box body 81, a right rear overflow water path 153rb on the rear inner side of the right side surface of the box body 81, a left front overflow water path 153lf on the front inner side of the left side surface of the box body 81, and a left rear overflow water path 153lb on the rear inner side of the left side surface of the box body 81.

[0118] The upstream overflow water path 155 is a partial cut of the edge portion 141 corresponding to the dike of the drain pan 82. The upstream overflow water path 155 locally reduces the height of the dike and reliably guides the water accumulated in the drain receiving recess 142 to the overflow water path 153. Preferably, there are a plurality of upstream overflow water paths 155, and at least one upstream overflow water path 155 is connected to each overflow water path 153. The depths of the plurality of upstream overflow water paths 155 can be the same or different. By setting the difference in the depths of the plurality of upstream overflow water paths 155, the priority order of the overflow water path 153 through which the water accumulated in the drain receiving recess 142 flows out can be set.

[0119] The back surface of the drain pan 82 is close to the back plate 88b directly fixed to the two rear column members 91br and 91bl. The gap between the back surface of the drain pan 82 and the inner surface of the back plate 88b is only the wall thickness dimension of the rear column members 91br and 91bl as angle steels, for example, about 2.5 mm. The pressure loss of such a gap between the back surface of the drain pan 82 and the inner surface of the back plate 88b is large and does not function as the overflow water passage 153.

[0120] In addition, the two right beam members 92ru and 92rd and the two left beam members 92lu and 92ld are directly fixed to the column member 91 in such a manner that the C-shaped cross section faces the outside of the box body 81. The right plate 88r and the left plate 88l are in contact with the open ends of these left and right beam members 92ru, 92rd, 92lu, and 92ld and are fixed to the column member 91. That is, between the right plate 88r, the left plate 88l and the column member 91, there is a gap with the same distance as the thickness of the beam members 92ru, 92rd, 92lu, and 92ld sandwiched by them. The bulging portion 151 of the drain pan 82 protrudes from the area included in the column member 91 in a plan view and enters this gap and approaches the right plate 88r and the left plate 88l.

[0121] As Figure 6 shown, the front surface of the drain pan 82 is in contact with the electric circuit box fixing plate 89, and there is an electric chamber 113 between it and the front plate 88f. The electric chamber 113 houses the electric circuit box 131.

[0122] The inner surface of the back plate 88b of the box body 81 is in direct contact with the column member 91 of the frame body 86. Therefore, the hot water supply storage tank assembly 3 can be stored in a lying position with the back side facing down. This lying position has a much lower possibility of tipping over compared to the case where the hot water supply storage tank assembly 3 is erected in advance. Therefore, the lying position is also a posture suitable for the handling of the hot water supply storage tank assembly 3.

[0123] In the drain pan 82 of the present embodiment, before the amount of the drained liquid accumulated in the drain receiving recess 142 exceeds the allowable amount of the drain receiving recess 142 in the event that the drain port 146 is blocked, the drained liquid accumulated in the drain receiving recess 142 flows out from the plurality of overflow water passages 153. The plurality of overflow water passages 153 are two overflow water passages 153rf and 153rb facing the right plate 88r and two overflow water passages 153lf and 153lb facing the left plate 88l. The two overflow water passages 153rf and 153rb on the right side of the cabinet 81 are separated by the right bulging portion 151r of the drain pan 82, and the two overflow water passages 153lf and 153lb on the left side of the cabinet 81 are separated by the left bulging portion 151l of the drain pan 82. Therefore, the water flowing out from the drain pan 82 flows down from the drain pan 82 to the bottom plate 85 along or close to at least one of the front side of the inner surface of the right plate 88r, the rear side of the inner surface of the right plate 88r, the front side of the inner surface of the left plate 88l, and the rear side of the inner surface of the left plate 88l. The flowing path of the water flowing out from the drain pan 82 does not overlap with the electrical circuit box 131 close to the front side of the cabinet 81. That is, the possibility that the electrical circuit box 131 is wetted by the water flowing out from the drain pan 82 is extremely low. Even if a small amount of moisture adheres to the electrical circuit box 131, there is almost no possibility that the control unit 6 accommodated in the electrical circuit box 131 is wetted by water.

[0124] In addition, the electrical circuit box 131 accommodating the control unit 6 is not limited to being close to the front plate 88f, and it may be close to any one of the plurality of side plates 88. In this case, the overflow water passages 153 may be arranged between at least one of the other three side plates 88 among the plurality of side plates 88 and the drain pan 82. That is, the electrical circuit box 131 and the overflow water passages 153 may be arranged inside different two side plates 88 among the four side plates 88 of the cabinet 81.

[0125] As Figure 5 , Figure 6 , Figure 9 and Figure 10 shown, the bottom plate 85 of the hot water supply storage tank assembly 3 of the present embodiment has: a front edge flat portion 161 that defines the bottom surface of the electrical chamber 113; a storage tank support table portion 162 that defines the bottom surface of the storage tank chamber 112 and has a seating surface 162a for mounting the hot water supply storage tank 12; and a flange 163 that is continuous with the four sides of the bottom plate 85 and extends upward to surround the front edge flat portion 161 and the storage tank support table portion 162.

[0126] The front edge flat portion 161 is continuous with the front of the storage tank support table portion 162. The front edge flat portion 161 extends over the entire width near the front edge of the bottom plate 85. The front edge flat portion 161 is substantially parallel to the top plate 87 of the cabinet 81.

[0127] The front edge flat portion 161 has a pair of left and right handle openings 165 for a person's fingers to insert when manually carrying the hot water supply storage tank assembly 3. The left and right handle openings 165 are arranged at an interval that is easy to insert the left and right fingers of the same person during manual handling. A resin handle 166 is provided at the handle opening 165. The handle 166 has a buckle (not shown in the figure) that can be hooked on the edge of the handle opening 165 and a support piece that elastically supports the buckle. The handle 166 is fixed to the bottom plate 85 by bending and deforming the support piece so that the buckle is hooked on the handle opening 165. A person carrying the hot water supply storage tank assembly 3 tilts the hot water supply storage tank assembly 3 backward with a pair of support legs 83 near the corner of the bottom plate 85 and the back plate 88b as a fulcrum, inserts fingers into the handle opening 165 from the outside to the inside of the hot water supply storage tank assembly 3, and then hooks the fingers on the handle 166, thereby easily lifting the hot water supply storage tank assembly 3. In addition, on the top plate 87 side of the hot water supply storage tank assembly 3, the corner of the top plate 87 and the back plate 88b is appropriately held. When putting down the hot water supply storage tank assembly 3 after handling, by grounding a pair of support legs 83 near the corner of the bottom plate 85 and the back plate 88b, it is easy to return the hot water supply storage tank assembly 3 to an upright position.

[0128] The tank support table portion 162 has a lowest first flat portion 171 in the height direction of the box body 81, a second flat portion 172 as the seating surface 162a of the hot water supply storage tank 12, and two third flat portions 173 respectively provided at two corners on the rear side of the bottom plate 85.

[0129] The shape of the second flat portion 172 is substantially circular, which is easy to configure the annular legs 125 of the hot water supply storage tank 12, and has a chord portion 162b substantially parallel to the front edge flat portion 161 at a position close to the front edge flat portion 161.

[0130] A plurality of fastening members 127 for fixing the hot water supply storage tank 12 are provided on the second flat portion 172. The plurality of fastening members 127 are arranged at equal intervals on the concentric circles of the circular second flat portion 172.

[0131] The second flat portion 172 has a concave portion 175 at the center of the tank support table portion 162 to prevent interference with the top (lowest part) of the dome-shaped lower head 121 of the hot water supply storage tank 12. The height position of the bottom surface of the concave portion 175 is set to the same height position as the first flat portion 171. Thereby, the sheet metal workability of the bottom plate 85 is improved. As long as interference between the lower head 121 and the bottom plate 85 is avoided, the concave portion 175 may not be provided.

[0132] In addition, the second flat portion 172 has two bridging portions 176 that reach the respective flanges 163 on the left and right. The right bridging portion 176r reaches the right flange 163r, and the left bridging portion 176l reaches the left flange 163l. Each bridging portion 176 extends in a direction orthogonal to the left and right flanges 163r, 163l through the center of the substantially circular second flat portion 172. The two bridging portions 176 may be absent.

[0133] The two third flat portions 173 are the right third flat portion 173r disposed at the right-rear corner of the bottom plate 85 and connecting the right flange 163r and the dorsal flange 163b, and the left third flat portion 173l disposed at the left-rear corner of the bottom plate 85 and connecting the left flange 163l and the dorsal flange 163b. Each third flat portion 173 has a rounded corner portion 173a at the diagonal of the corner where the flange 163 is bent at a right angle. The rounded corner portion 173a is closest to the second flat portion 172 in the third flat portion 173.

[0134] In the height direction of the housing 81, the first flat portion 171 is disposed at a position lower than the front edge flat portion 161, the second flat portion 172, and the third flat portion 173. The first flat portion 171 located below the front edge flat portion 161, the second flat portion 172, and the third flat portion 173 causes the bottom plate 85 to function as a second drain pan for receiving the drain liquid flowing down to the bottom plate 85.

[0135] The first flat portion 171 is divided into a front drain receiving recess 177f and a rear drain receiving recess 177b, with the second flat portion 172 sandwiched therebetween. The front drain receiving recess 177f is surrounded by the rear edge of the front edge flat portion 161, the front edges of the left and right flanges 163, the front edges of the left and right bridging portions 176, the left and right arcs of the second flat portion 172, and the chord portion 162b of the second flat portion 172. The rear drain receiving recess 177b is surrounded by the rear arc of the second flat portion 172, the rear edges of the left and right bridging portions 176, the rear sides of the left and right flanges 163, the edges of the left and right third flat portions 173, and the dorsal flange 163b. The first flat portion 171 may enter radially toward the center of the circular portion of the second flat portion 172, or may be connected to the central recess 175 of the second flat portion 172. By connecting the first flat portion 171 to the central recess 175 of the second flat portion 172, the drain liquid storage capacity of the bottom plate 85 can be increased.

[0136] The upper ends of the flanges 163 are aligned at substantially the same height in the height direction of the housing 81.

[0137] Each support leg 83 of the hot water supply storage tank assembly 3 is disposed at each corner of the bottom plate 85, that is, at the third flat portion 173 or the front edge flat portion 161 of the storage tank support table portion 162. That is, the front drain receiving recess 177f and the rear drain receiving recess 177b, that is, the first flat portion 171, are disposed below the plate portions (the third flat portion 173, the front edge flat portion 161) for the support legs 83 to support the bottom plate 85.

[0138] The bottom plate 85 having the surrounding flange 163 and a plurality of plate portions (the front edge flat portion 161, the first flat portion 171, the second flat portion 172, the third flat portion 173) functions as the second drain pan. The plurality of plate portions are disposed with height differences at positions corresponding to the webs inside the flange 163 and have high rigidity as a support plate for supporting the hot water supply storage tank 12. It is considered that this high rigidity depends on the third flat portion 173 connecting the ends of the flange 163. In addition, the bridging portion 176 connecting the first flat portion 171 and the central portion of the flange 163 further improves the rigidity of the bottom plate 85.

[0139] The handle 166 provided on the front edge flat portion 161 of the bottom plate 85 is covered by a rectangular handle cover 181 provided inside the box body 81. The handle cover 181, like the bottom plate 85, the top plate 87, and the side plates 88 which are exterior components of the box body 81, is made of metal and is a processed product of sheet metal similar to the electrical circuit box 131. The handle cover 181 has a plurality of outward flanges 182 provided at the lower ends of the left and right side surfaces. The outward flanges 182 are bent from the lower ends of the left and right side surfaces of the handle cover 181 toward the outside of the handle cover 181.

[0140] The front edge flat portion 161 is provided with left and right flange crimping portions 183 into which the rear end portions of the left and right outward flanges 182 of the handle cover 181 can be inserted respectively. The flange crimping portions 183 are portions formed by cutting the sheet metal bottom plate 85 and making the vicinity of the cut recessed toward the inside of the box body 81 (above the bottom plate 85), and are formed by cutting and bending the sheet metal bottom plate 85.

[0141] Each flange crimping portion 183 depicts a triangular shape having: a first side closest to the storage tank support table portion 162 and arranged in a straight line; a second side intersecting the first side at a right angle and being the farthest from the other opposite flange crimping portion 183; and a third side connecting the first side and the second side and inclined in such a way that it gets closer to the other flange crimping portion 183 as it gets closer to the storage tank support table portion 162. The left and right second sides are separated from the left and right outward flanges 182 of the handle cover 181 by the same distance. Therefore, if the rear end portion of the outward flange 182 of the handle cover 181 is inserted into the flange crimping portion 183, the handle cover 181 reaches the first side while being guided by the second side, determining the mounting position of the handle cover 181 relative to the bottom plate 85.

[0142] The top surface of the box body 81 of the hot water supply storage tank assembly 3 is covered by a top plate 87, and the front, back, right side, and left side are respectively covered by side plates 88 made of sheet metal. On the other hand, a bottom plate 85 covering the bottom surface of the box body 81 exposes a resin-made and flammable handle 166 to the exterior of the box body 81 through a handle opening 165. Here, assuming that there is a fire source around the hot water supply storage tank assembly 3, the flammable handle 166 may melt or burn due to the fire source, resulting in the intrusion of flames into the box body 81. Therefore, the hot water supply storage tank assembly 3 of the present embodiment prevents the intrusion of flames into the box body 81 by surrounding the handle opening 165 and the handle 166 with a handle cover 181 made of sheet metal.

[0143] The front surface of the handle cover 181 has holes (not shown) through which two fastening members 185, such as screws, for fixing the handle cover 181 to the handle 166 penetrate. The two fastening members 185 are fastened to the handle 166 from the outside of the handle cover 181. The handle cover 181 is fixed to the box body 81 by the fastening members 185 fastened to the handle 166 and the flange crimping portion 183 of the leading edge flat portion 161. That is, in the assembly of the handle cover 181 and the box body 81, as long as there are two fastening members 185, the number of components required for installation can be reduced compared to the case where the handle cover 181 is fixed to the box body 81 only by the fastening members.

[0144] The top surface of the handle cover 181 is preferably parallel to the leading edge flat portion 161 of the bottom plate 85. The top surface of the handle cover 181 is close to the support leg 83. Therefore, when setting up the hot water supply storage tank assembly 3, by placing a level on the top surface of the handle cover 181 and adjusting the telescopic movement of the support leg 83 while confirming the level, the horizontal plane (the plane orthogonal to the center line C of the storage tank 51) of the hot water supply storage tank assembly 3 can be easily made parallel to the horizontal plane of the installation site, and the installation posture of the hot water supply storage tank assembly 3 can be adjusted.

[0145] As described above, the hot water supply storage tank assembly 3 and the heat pump water heater 1 of the present embodiment guide the water overflowing from the drain pan 82 to the lower side inside the box body 81 through the overflow water path 153, which is the gap between the non-bulging portion 152 of the drain pan 82 and the side plate 88. Therefore, in the hot water supply storage tank assembly 3 and the heat pump water heater 1, even if the drain liquid overflows from the drain pan 82 by any chance, a path for the drain liquid to flow down is defined, and the situation where the drain liquid splashes on the electrical circuit that should be protected from getting wet can be prevented in advance.

[0146] In addition, the hot water supply storage tank assembly 3 and the heat pump water heater 1 of the present embodiment include: a control unit 6 as an electrical circuit, which is disposed below the drain pan 82 housed in the box body 81 and is close to any one of the plurality of side plates 88; and an overflow water path 153, which is disposed on at least one of the other three side plates 88 among the plurality of side plates 88. Therefore, in the hot water supply storage tank assembly 3 and the heat pump water heater 1, even if the control unit 6 is disposed below the drain pan 82, it is possible to prevent the situation where the drain flowing down from the drain pan 82 splashes on the control unit 6. Any one of the plurality of side plates 88 is, for example, the front plate 88f, the control unit 6 is disposed on the front side of the box body 81, the other three side plates 88 are the rear plate 88b, the right plate 88r, and the left plate 88l, and the overflow water path 153 may be disposed on at least one of the back side, the right side surface side, and the left side surface side inside the box body 81.

[0147] Moreover, the hot water supply storage tank assembly 3 and the heat pump water heater 1 of the present embodiment have an upstream overflow water path 155, which is provided in the non-bulging portion 152 and communicates with the overflow water path 153, and guides the water accumulated in the drain pan 82 to the overflow water path 153. Therefore, even if the drain overflows from the drain pan 82 by any chance, the hot water supply storage tank assembly 3 and the heat pump water heater 1 can reliably discharge the drain accumulated in the drain pan 82 to the overflow water path 153.

[0148] Therefore, according to the hot water supply storage tank assembly 3 of the present embodiment and the heat pump water heater 1 including the hot water supply storage tank assembly 3, even if the drain hole 146 of the drain pan 82 is blocked and the water in the drain pan 82 overflows, it is possible to prevent the water from splashing on the electrical circuit, that is, the control unit 6, disposed below the drain pan 82.

[0149] As described above, several embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments or their modifications are included in the scope or gist of the invention and are included in the invention described in the claims and its equivalents.

[0150] Description of Reference Numerals

[0151] 1 Heat pump water heater

[0152] 2 Outdoor assembly

[0153] 3 Hot water supply storage tank assembly

[0154] 5 Remote controller

[0155] 6 Control unit

[0156] 11 Water heat exchanger

[0157] 12 Hot water supply storage tank

[0158] 13 Refrigerant pipe

[0159] 15 and 16 Cross-connecting pipes

[0160] 21 External unit

[0161] 21 External unit

[0162] 22 Heat dissipation device

[0163] 22 Radiator

[0164] 23 Indoor unit

[0165] 31 Spare heater

[0166] 32 Refrigerant circuit

[0167] 35 Compressor

[0168] 36 Air heat exchanger

[0169] 37 Expansion valve

[0170] 38 Four-way valve

[0171] 39 Liquid receiver

[0172] 41 Heat medium circulation circuit

[0173] 42 Circulating water pipe

[0174] 43 First pump

[0175] 45 Expansion tank

[0176] 46 Flow sensor

[0177] 51 Storage tank

[0178] 52 Outlet

[0179] 53 Water supply pipe

[0180] 55 Coil

[0181] 56 Hot water supply pipe

[0182] 58 Heat insulation member

[0183] 55a Circulating water inlet section

[0184] 55b Spiral section

[0185] 55c Circulating water return section

[0186] 61 Liquid supply pipe

[0187] 62 Liquid return pipe

[0188] 65 External circulation circuit

[0189] 66 External circulating water pipeline

[0190] 67 Three-way valve

[0191] 68 Second pump

[0192] 69 Mixing valve

[0193] 71 External liquid delivery pipe

[0194] 71 a First liquid delivery pipe

[0195] 71 b Second liquid delivery pipe

[0196] 72 External liquid return pipe

[0197] 72a First liquid return pipe

[0198] 72b Second liquid return pipe

[0199] 81 Box body

[0200] 82 Drainage tray

[0201] 82b Inner bottom surface

[0202] 82b Outer bottom surface

[0203] 83 Support leg

[0204] 85 Bottom plate

[0205] 86 Frame body

[0206] 87 Top plate

[0207] 88 Side plate

[0208] 88f Front plate

[0209] 88b Back plate

[0210] 88r Right plate

[0211] 88 l Left plate

[0212] 89 Fixed plate for electrical circuit box

[0213] 91 Column member

[0214] 91 fr Front right column member

[0215] 91f l Front left column member

[0216] 91br Rear right column member

[0217] 91b1 Rear left column member

[0218] 92 Beam member

[0219] 92fu front upper beam component

[0220] 92fd front lower beam component

[0221] 92bu rear upper beam component

[0222] 92bd rear lower beam component

[0223] 92ru right upper beam component

[0224] 92rd right lower beam component

[0225] 92lu left upper beam component

[0226] 92ld left lower beam component

[0227] 101 through hole

[0228] 102 connection port

[0229] 111 machinery room

[0230] 112 storage tank room

[0231] 113 electrical room

[0232] 121 lower head

[0233] 122 upper head

[0234] 123 main body part

[0235] 125 leg

[0236] 127 fastening component

[0237] 131 electrical circuit box

[0238] 132 main body heat insulation part

[0239] 141 edge part

[0240] 142 liquid drainage receiving recess

[0241] 143 pipeline configuration hole

[0242] 145 convex part

[0243] 146 drain hole

[0244] 147 liquid drainage pipe

[0245] 148 opening part

[0246] 151 bulging part

[0247] 151r right bulging part

[0248] 151l left bulging part

[0249] 152 Non-bulging part

[0250] 152rf Right front non-bulging part

[0251] 152rb Right rear non-bulging part

[0252] 152lf Left front non-bulging part

[0253] 152lb Left rear non-bulging part

[0254] 153 Overflow waterway

[0255] 153rf Right front overflow waterway

[0256] 153rb Right rear overflow waterway

[0257] 153lf Left front overflow waterway

[0258] 153lb Left rear overflow waterway

[0259] 155 Upstream overflow waterway

[0260] 161 Front edge flat part

[0261] 162 Storage tank support platform part

[0262] 162a Seating surface

[0263] 162b Chord part

[0264] 163 Flange

[0265] 163r Right side flange

[0266] 163l Left side flange

[0267] 163b Dorsal flange

[0268] 165 Handle opening

[0269] 166 Handle

[0270] 171 First flat part

[0271] 172 Second flat part

[0272] 173 Third flat part

[0273] 173a Rounded corner part

[0274] 173r Right side third flat part

[0275] 173l Left side third flat part

[0276] 175 Concave part

[0277] 176 Bridging part

[0278] 176r right bridging part

[0279] 176l left bridging part

[0280] 177f front drainage receiving recess

[0281] 177b rear drainage receiving recess

[0282] 181 handle cover

[0283] 182 outer flange

[0284] 183 flange crimping part

[0285] 185 fastening component

Claims

1. A hot water supply storage tank assembly, characterized in that, it comprises: a box body having a bottom plate, a frame body having a plurality of column members standing up from the bottom plate, and a plurality of side plates spanned between adjacent column members; a hot water supply storage tank mounted on the bottom plate and received in the lower side of the box body; a water circuit received in the box body at a position above the hot water supply storage tank for water to flow; a drain pan disposed between the water circuit and the hot water supply storage tank and supported by the frame body and the hot water supply storage tank; and an electrical circuit received in the box body at a position below the drain pan and close to any one of the plurality of side plates, the drain pan has a bulging portion close to at least one other of the plurality of side plates and a non-bulging portion farther from the at least one other side plate than the bulging portion, and water overflowing from the drain pan is guided to the lower side inside the box body through a gap between the non-bulging portion of the drain pan and the side plate, i.e., an overflow water path.

2. The hot water supply storage tank assembly according to claim 1, characterized in that, the water circuit comprises: a water heat exchanger for performing heat exchange between a refrigerant and the water; and a circulation circuit for the water that has undergone heat exchange in the water heat exchanger to flow.

3. The hot water supply storage tank assembly according to claim 1 or 2, characterized in that, it comprises a refrigerant circuit disposed directly above the drain pan for the refrigerant that has undergone heat exchange in the water heat exchanger to flow.

4. The hot water supply storage tank assembly according to any one of claims 1 to 3, characterized in that, the drain pan is a molded product of a foaming material, and there is a gap between the bulging portion and the side plate.

5. The hot water supply storage tank assembly according to any one of claims 1 to 4, characterized in that, the electrical circuit is disposed on the front surface, and the overflow water path is disposed on at least one of the back surface, the right side surface, and the left side surface.

6. The hot water supply storage tank assembly according to any one of claims 1 to 5, characterized in that, the drain pan has an upstream overflow water path provided in the non-bulging portion and communicating with the overflow water path for guiding the water accumulated in the drain pan to the overflow water path.

7. The hot water supply storage tank assembly according to any one of claims 1 to 6, characterized in that, the bottom plate has a handle opening, and the hot water supply storage tank assembly comprises: a resin handle disposed inside the box body and provided in the handle opening; a metal handle cover disposed inside the box body and covering the handle; and a fastening member for fixing the handle cover to the handle.

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