JP7433478B2 - Heat pump water heater, heat pump device equipped with a heat pump water heater, and method for assembling a heat pump water heater - Google Patents

Description

The present disclosure relates to a heat pump water heater that supplies hot water, a heat pump device, and a method for assembling the heat pump water heater.

Some heat pump water heaters are connected to a hot water supply destination such as a shower and a heater such as a radiator, and supply hot water to the hot water destination, as well as mixing hot water of different temperatures and supplying the mixture to the heater (for example, (See Patent Document 1). The heat pump water heater of Patent Document 1 includes a circuit for generating hot water to be supplied to a hot water supply destination (hereinafter referred to as a high temperature water generation hot water supply circuit) and a circuit for generating hot water to be supplied to a heater (hereinafter referred to as a low temperature water generation circuit). (hot water supply circuit). The high temperature water generation hot water supply circuit of Patent Document 1 is configured by a hot water storage tank, a plurality of pipes, and the like. Further, the low temperature water generation hot water supply circuit of Patent Document 1 includes an upper hot water outlet pipe, an intermediate hot water outlet pipe, a return pipe, a mixing valve, a heating outgoing pipe that communicates the mixing valve and the inlet of the heater, and a heating It consists of a circulation pump and a bypass pipe that connects the middle of the return pipe and the mixing valve. The mixing valve of Patent Document 1 mixes the high temperature water at the top of the hot water storage tank taken out from the upper hot water tap piping and the medium temperature water at the middle part of the hot water storage tank taken out from the middle hot water tap piping, and further heats the water. The system is designed to mix low-temperature water that has passed through the vessel and adjust it to a predetermined temperature, and then flow the adjusted hot water to the heater.

Japanese Patent Application Publication No. 2010-84974

In a heat pump water heater equipped with a high temperature water generating hot water supply circuit and a low temperature water generating hot water supply circuit as in Patent Document 1, each component of the low temperature water generating hot water supply circuit is not integrated, and the high temperature water generating hot water supply circuit is provided. When the low temperature water generating hot water supply circuit was assembled into the unit provided with the high temperature water generating hot water supply circuit, it was necessary to assemble each component of the low temperature water generating hot water supply circuit to the unit provided with the high temperature water generating hot water supply circuit. For this reason, in the heat pump water heater of Patent Document 1, the work required to assemble the low-temperature water generating hot water supply circuit to the unit provided with the high temperature water generating hot water supply circuit increases in proportion to the number of component parts, and the ease of assembly may deteriorate. there were.

The present disclosure has been made to solve the above-mentioned problems, and provides a heat pump water heater, a heat pump device, and a heat pump that can suppress deterioration in assemblability even when equipped with a high-temperature water generation hot-water supply circuit and a low-temperature water generation hot-water supply circuit. The purpose is to provide a method for assembling a water heater.

The heat pump water heater according to the present disclosure includes a first circuit section in which water circulates and heats the water by heat exchange with a refrigerant, and a first circuit section that is connected to an external heating load, and the water heated by the first circuit section. a second circuit section having a plurality of flow path components, the water being heated in the first circuit section and the return water after heat dissipation being mixed by flowing the water to the heating load to radiate the heat; a housing unit in which the first circuit section and the second circuit section are housed; a fixed sheet metal to which the plurality of channel components of the second circuit section are fixed and attached to the housing unit; The second circuit section is arranged above the first circuit section .
Further, a heat pump device according to the present disclosure includes the heat pump water heater described above and an outdoor unit equipped with an air-refrigerant heat exchanger that exchanges heat between the refrigerant and air.
Further, in the method for assembling a heat pump water heater according to the present disclosure, a first circuit section in which water circulates and heats the water by heat exchange with a refrigerant is connected to an external heating load, and the first circuit section The heated water is caused to flow to the heating load to radiate heat, and the water heated in the first circuit portion and the return water after heat radiation are mixed, the first circuit having a plurality of flow path components. 2 circuit section, a housing unit in which the first circuit section and the second circuit section are housed, and the plurality of flow path components of the second circuit section are fixed and attached to the housing unit. A fixing sheet metal plate , wherein the second circuit section is disposed above the first circuit section. The method further includes a step of assembling the fixed sheet metal to which the fixed plate is fixed to the housing unit in which the first circuit section is housed.

According to the present disclosure, since the fixed plate is provided to which the plurality of channel components constituting the second circuit section are fixed, and the fixed plate is attached to the housing unit, the second circuit section is integrated with the fixed plate in advance. This eliminates the need to fix each of the channel components of the second circuit section to the housing unit. Therefore, when assembling the second circuit section to the housing unit in which the first circuit section is provided, an increase in work according to the number of flow path components is suppressed, and the first circuit section and the second circuit section are provided. Even in such cases, deterioration in assembly efficiency can be suppressed more than before.

1 is a perspective view showing the appearance of a heat pump water heater according to Embodiment 1. FIG. FIG. 2 is a perspective view showing the internal configuration of the heat pump water heater of FIG. 1. FIG. 3 is a perspective view showing the configuration of a second circuit section in the heat pump water heater of FIG. 2. FIG. FIG. 3 is a perspective view showing an assembled form of a second circuit section in the heat pump water heater of FIG. 2; FIG. 3 is a partial perspective view showing the structure of the upper part of the heat pump water heater of FIG. 2. FIG. FIG. 6 is a right side view showing the configuration of a connecting portion between the second circuit section and the first circuit section in the upper part of the heat pump water heater of FIG. 5. FIG. 3 is a left side view of the heat pump water heater of FIG. 2. FIG. FIG. 8 is a partially enlarged view showing the configuration around the connection portion between the first drain pan and the first drain hose in the heat pump water heater of FIG. 7; FIG. 2 is a circuit configuration diagram of a heat pump device according to a second embodiment.

Embodiment 1.
FIG. 1 is a perspective view showing the appearance of a heat pump water heater 1 according to the first embodiment. As shown in FIG. 1, the heat pump water heater 1 includes a housing unit 40 as an outer shell. In the example shown in FIG. 1, the housing unit 40 has a vertically long rectangular parallelepiped shape.

The arrow X direction in FIG. 1 represents the width direction of the heat pump water heater 1, the arrow Y direction represents the depth direction of the heat pump water heater 1, and the arrow Z direction represents the height direction of the heat pump water heater 1. Hereinafter, embodiments of a heat pump water heater 1 according to the present disclosure will be described with reference to the drawings. Note that the present disclosure is not limited to the form of the drawings shown below. In addition, in the following explanation, terms indicating directions (for example, "upper", "lower", "right", "left", "front", "rear", etc.) are used as appropriate to facilitate understanding. This is for illustrative purposes; these terms are not intended to limit this disclosure. Unless otherwise specified, terms indicating these directions mean directions when the heat pump water heater 1 is viewed from the front side (front side). Furthermore, in each figure, the same reference numerals are the same or equivalent, and this is common throughout the entire specification.

FIG. 2 is a perspective view showing the internal configuration of the heat pump water heater 1 of FIG. 1. The housing unit 40 is composed of a plurality of plate-shaped members. The housing unit 40 includes a back metal plate 43 forming a back surface, a bottom plate 44 forming a bottom surface, a front panel 41 forming a front surface as shown in FIG. 1, and two panels forming a left side surface and a right side surface, respectively. It is composed of a side panel 42 and a top plate 45 forming an upper surface. The back metal plate 43 has a screw hole 43a into which a screw for fixing a base metal plate 52 (described later in FIG. 4) to the back metal plate 43 is inserted. Further, a drain port (not shown) for drain water is formed in the back metal plate 43.

As shown in FIG. 2, the heat pump water heater 1 includes a first circuit section 3 and a second circuit section 2. The first circuit section 3 is connected to the second circuit section 2 and has a connection circuit C12 through which water, which is a heat medium, flows, and heats the water by heat exchange with the refrigerant. Further, the first circuit section 3 includes a hot water supply side circuit C11 through which hot water supply water flows, and supplies heated hot water supply water to external hot water supply destinations such as a shower and a kitchen, for example. The hot water supply side circuit C11 has a water storage tank 31 in which water supplied from a water source such as tap water is stored.A hot water supply water inflow pipe P11 is connected to the lower part of the water storage tank 31, and a water supply water inflow pipe P11 is connected to the upper part of the water storage tank 31. is connected to a hot water supply water outflow pipe P12. The second circuit section 2 is connected to the connection circuit C12 of the first circuit section 3, and is also connected to an external heating load (not shown) having a different operating temperature, such as a radiator and floor heating.

FIG. 3 is a perspective view showing the configuration of the second circuit section 2 in the heat pump water heater 1 of FIG. 2. As shown in FIG. As shown in FIG. 3, the second circuit section 2 includes a hot water supply circuit C21 on the high temperature side, a hot water supply circuit C22 on the low temperature side, a return circuit C23, and a bypass circuit C24. water (hereinafter sometimes referred to as high-temperature water) and return water after heat radiation are mixed. The second circuit section 2 supplies high temperature water from the high temperature side hot water supply circuit C21 to the high temperature side heating load (not shown), and also supplies high temperature water from the low temperature side hot water supply circuit C22 to the low temperature side heating load (not shown). and return water from the heating load on the high temperature side (hereinafter sometimes referred to as low temperature water) is supplied.

In FIG. 3, the flow direction of high-temperature water flowing from the first circuit section 3 to the second circuit section 2 is indicated by a white arrow A1, and the flow direction of high-temperature water flowing from the second circuit section 2 to the first circuit section 3 is indicated by a white arrow A1. The flow direction of the return water from the circuit section 2 is indicated by a white arrow A6. In addition, in FIG. 3, the flow direction of high temperature water sent from the second circuit section 2 to the heating load on the high temperature side is indicated by a white arrow A2, and the flow direction of the high temperature water sent from the heating load on the high temperature side to the second circuit section 2 is shown. The flow direction is indicated by a white arrow A3. In addition, in FIG. 3, the flow direction of the low temperature water, in which the high temperature water and the return water are mixed and goes from the second circuit section 2 to the heating load on the low temperature side, is shown by a white arrow A4. The flow direction of the return water returning to the two-circuit section 2 is indicated by a white arrow A5.

As shown in FIG. 2, a plurality of flow path components that constitute the second circuit section 2 and a plurality of flow path components that constitute the first circuit section 3 are housed in a housing unit 40. The second circuit section 2 is arranged inside the housing unit 40 above the first circuit section 3, particularly above the water storage tank 31, which has the largest volume among the flow path components of the first circuit section 3. There is. The heat pump water heater 1 also includes a drainage section 70 (FIG. 7, which will be described later) for discharging condensed water (hereinafter referred to as drain water) generated inside the housing unit 40 to the outside.

In the first circuit section 3, the hot water supply side circuit C11 heats the hot water supply water by heat exchange with the high temperature water of the connection circuit C12, and sends the heated hot water supply water to the hot water supply destination. The hot water supply side circuit C11 includes a water storage tank 31 to which the above-mentioned hot water supply water inflow pipe P11 and hot water supply water outflow pipe P12 are connected, a pipe P13 connecting the upper and lower parts of the water storage tank 31, and a hot water supply pipe provided in the pipe P13. It has a water pump 6c and a water-water heat exchanger 30. The water-water heat exchanger 30 is for exchanging heat between the high-temperature water in the hot water supply side circuit C11 in the first circuit section 3 and the hot water supply water in the connection circuit C12.

The connection circuit C12 of the first circuit section 3 heats water, which is a heat medium, by heat exchange with a refrigerant, sends the heated water, that is, high-temperature water, to the second circuit section 2, and also transfers the high-temperature water between water and water. The hot water supply water in the hot water supply side circuit C11 is heated by flowing through the heat exchanger 30. The connection circuit C12 includes a water pump 6d, a refrigerant-water heat exchanger 32, the above water-water heat exchanger 30, a three-way valve 33, and a first outflow pipe P14 through which water flows out to the second circuit section 2. and a first inflow pipe P15 into which water flows from the second circuit section 2. The outlet side of the first outflow pipe P14 is connected to the second inflow pipe P21 of the second circuit section 2, and the first inflow pipe P15 is connected to the second outflow pipe P22 of the second circuit section 2.

As shown in FIG. 3, the return circuit C23 of the second circuit section 2 returns unused high-temperature water among the return water from the external heating load and the high-temperature water that has flowed in from the first circuit section 3 to the second circuit section C23. 1 circuit section 3. The bypass circuit C24 of the second circuit section 2 connects the middle of the return circuit C23 and the middle of the low temperature side hot water supply circuit C22, and supplies return water from the high temperature side heating load to the low temperature side heating load. It is configured to be used.

The second circuit section 2 is composed of flow path components such as a plurality of pipes, a mixing valve 23, a first water pump 6a, and a second water pump 6b. Further, the second circuit section 2 may be configured to include a strainer 20 that removes debris from the water. In the second circuit section 2, the pipes are joined together by, for example, brazing.

The plurality of pipes constituting the second circuit section 2 include a high temperature side main pipe P23, a second inflow pipe P21 connected to the middle of the high temperature side main pipe P23, and a high temperature side outgoing pipe P24 connected to one end of the high temperature side main pipe P23. etc. are included. Further, the plurality of pipes constituting the second circuit section 2 include a low-temperature side main pipe P25, a low-temperature side outgoing pipe P26 connected to one end of the low-temperature side main pipe P25, a high-temperature water feed pipe P27, and the like. The high temperature water feed pipe P27 connects a position on the other end side of the high temperature side main pipe P23 from the position where the second inflow pipe P21 is connected to the other end of the low temperature side main pipe P25.

The first water pump 6a is provided at a position closer to one end of the high temperature side main pipe P23 than the position where the second inflow pipe P21 is connected. A high temperature side hot water supply circuit C21 is formed by a portion of the high temperature side main pipe P23 on one end side of the position where the second inflow pipe P21 is connected, the first water pump 6a, and the high temperature side outgoing pipe P24. ing.

A mixing valve 23 is provided on the side of the high temperature water feed pipe P27 in the low temperature side main pipe P25, and a first water pump 6a is provided on the side of the low temperature side outgoing pipe P26 rather than the mixing valve 23 in the low temperature side main pipe P25. . A portion of the high temperature side main pipe P23 between the position where the second inflow pipe P21 is connected and the position where the high temperature water feed pipe P27 is connected, the high temperature water feed pipe P27, the mixing valve 23, and the second water pump. 6b and the low temperature side outgoing pipe P26 form a low temperature side hot water supply circuit C22.

In addition, the plurality of pipes constituting the second circuit section 2 include a main return pipe P28, a second outflow pipe P22 connected to the middle of the main return pipe P28, and a high temperature side return pipe P29 connected to one end of the main return pipe P28. etc. are included. Further, the plurality of pipes constituting the second circuit section 2 include a low-temperature side return pipe P30 that is connected to one end of the main return pipe P28 from a position where the second outflow pipe P22 is connected. A return circuit C23 is formed by the high temperature side return pipe P29, the low temperature side return pipe P30, the main return pipe P28, and the second outflow pipe P22.

In addition, the plurality of pipes constituting the second circuit section 2 include a return branch pipe P31 that connects to the middle of the high temperature side return pipe P29, a return water feed pipe P32 that connects the return branch pipe P31 and the mixing valve 23, is included. A bypass circuit C24 is formed by the return branch pipe P31, the strainer 20, and the return water feed pipe P32.

The operation of the second circuit section 2 will be explained based on FIG. 3. The high temperature water generated by the first circuit section 3 (FIG. 2) flows into the second circuit section 2 via the second inflow pipe P21, a part of which flows into the high temperature side hot water supply circuit C21, and the remaining part. It flows into the low temperature side hot water supply circuit C22. The high-temperature water that has flowed into the high-temperature side hot water supply circuit C21 flows to the high-temperature side outgoing pipe P24 via the first water pump 6a provided in the high-temperature side main piping P23, and then flows from the outlet of the high-temperature side outgoing pipe P24 to the high-temperature side heating load. sent to. The high-temperature water sent out from the outlet of the high-temperature side outgoing pipe P24 performs a heating function at a high temperature by dissipating heat from the heating load on the high-temperature side while flowing out. The water radiated by the heating load on the high temperature side (hereinafter referred to as high temperature return water) flows into the return circuit C23 of the second circuit section 2 via the high temperature side return pipe P29. A portion of the high-temperature return water that has flowed into the return circuit C23 flows into the mixing valve 23 through the bypass circuit C24, and the remaining portion of the high-temperature return water flows into the main return pipe P28. When the high-temperature return water passes through the bypass circuit C24, dirt in the water is removed by the strainer 20. The high-temperature return water that has passed through the bypass circuit C24 and flowed into the mixing valve 23 is transferred to the high-temperature return water that has flowed into the low-temperature side water supply circuit C22 via the second inflow pipe P21 at the mixing valve 23 provided in the low-temperature side hot water supply circuit C22. It mixes with water and becomes low-temperature water, which is lower than high-temperature water. The low temperature water flowing out of the mixing valve 23 of the low temperature side hot water supply circuit C22 flows to the low temperature side outgoing pipe P26 via the second water pump 6b, and is sent out to the low temperature side heating load from the outlet of the low temperature side outgoing pipe P26. The low-temperature water sent out from the outlet of the low-temperature side outgoing pipe P26 performs a heating function at a low temperature by radiating heat while flowing out of the heating load on the low-temperature side. The water radiated by the heating load on the low temperature side (hereinafter referred to as low temperature water return water) flows into the return circuit C23 of the second circuit section 2 via the low temperature side return pipe P30. The low-temperature return water that has flowed into the return circuit C23 joins the remaining portion of the high-temperature return water in the main return pipe P28, and is sent out to the first circuit section 3 again via the second outflow pipe P22.

FIG. 4 is a perspective view showing an assembled form of the second circuit section 2 in the heat pump water heater 1 of FIG. 2. As shown in FIG. FIG. 5 is a partial perspective view showing the structure of the upper part of the heat pump water heater 1 of FIG. 2. As shown in FIG. The structure around the second circuit section 2 in the heat pump water heater 1 will be explained using FIGS. 3 to 5.

As shown in FIG. 4, the heat pump water heater 1 includes a fixed plate 50 to which a plurality of channel components constituting the second circuit section 2 are fixed, and a fixed component to fix the channel components to the fixed plate 50. 51, and a base metal plate 52 for attaching the fixed metal plate 50 to the back metal plate 43. The plurality of channel components of the second circuit section 2 are arranged on the front side of the fixed metal plate 50. The fixed component 51 does not need to be provided on all of the plurality of channel components that are integrated with the fixed sheet metal 50, and may be provided only on some of the channel components. In the example shown in FIG. 3, among a plurality of flow path components that are integrated with the fixed sheet metal 50 in advance, for example, high temperature side main piping P23 and low temperature side main piping P25 are arranged along the front surface of the fixed sheet metal 50. Only the plurality of pipes are fixed to the fixed metal plate 50 by fixed parts 51. On the other hand, the fixed parts 51 are not provided in flow path components such as the return water feed pipe P32, the strainer 20, the first water pump 6a, the second water pump 6b, and the mixing valve 23 provided in the return water feed pipe P32. Furthermore, in the example shown in FIG. 4, all the channel components constituting the second circuit section 2 are integrated in advance before assembly, but at least two or more channel components are connected to the fixed sheet metal 50. It is fine if it is integrated.

As shown in FIG. 3, the fixing component 51 is configured to fix, for example, piping among the plurality of channel components constituting the second circuit section 2 to the fixed metal plate 50. In this case, the fixing component 51 can be composed of a metal band. The fixing part 51 that fixes the pipe includes, for example, a U-shaped peripheral part 51a that contacts the outer periphery of the pipe, and a fixing part that extends outward from both ends of the peripheral part 51a and is fixed to the fixed metal plate 50 with fixing screws 54. 51b.

With such a configuration, as shown in FIG. 4, the plurality of pipes of the second circuit section 2 connected by brazing are fixed to the fixed sheet metal 50 by the fixing component 51, and the plurality of pipes constituting the second circuit section 2 are The flow path component and the fixed metal plate 50 are integrated. Therefore, there is no need to fix each of the channel components of the second circuit section 2 to the housing unit 40. Therefore, when assembling the second circuit section 2 to the housing unit 40 in which the first circuit section 3 is mounted, an increase in work according to the number of flow path components is suppressed, and deterioration of assembly efficiency is suppressed more than before. can do.

As shown by the dashed line in FIG. 4, the base metal plate 52 is fixed to the back metal plate 43 of the housing unit 40 via screws or the like. The base metal plate 52 includes a flat plate part 52a to which the fixed metal plate 50 is fixed facing each other, a connecting part 52c extending rearward from both sides of the flat plate part 52a in the width direction (arrow X direction), and a connecting part 52c extending from the rear end of the connecting part 52c. It has a base fixing part 52b extending outward.

In the example shown in FIG. 4, the flat plate portion 52a has a rectangular shape when viewed from the front. A screw hole 43a is formed in the flat plate part 52a, into which a screw for fixing the fixed metal plate 50 to the flat plate part 52a is inserted.

Of the two connecting portions 52c, the right connecting portion 52c extends rearward from the right end of the flat plate portion 52a and is connected to the left end of the right base fixing portion 52b. Of the two connecting portions 52c, the left connecting portion 52c extends rearward from the left end of the flat plate portion 52a and is connected to the right end of the left base fixing portion 52b. The base metal plate 52 is fixed to the housing unit 40 so that each base fixing part 52b and the inner surface of the back metal plate 43 face each other.

In each base fixing portion 52b, a hole 52b1 is formed at a position corresponding to the screw hole 43a formed in the back metal plate 43. In the example shown in FIG. 4, the screw holes 43a of the back metal plate 43 are provided in two places above and below the left side and two places above and below the right side in the upper part of the back metal plate 43, and the holes 52b1 of each base fixing part 52b are , there are two locations on the top and bottom. The base plate 52 is fixed to the back metal plate 43 by inserting screws into the hole 52b1 of the base fixing portion 52b and the screw hole 43a of the back metal plate 43.

A space is formed between the flat plate part 52a and the two connecting parts 52c of the base metal plate 52 and the back metal plate 43. Therefore, as shown in FIG. 5, there is a connection between the outside of the first circuit section 3 housed in the lower part of the housing unit 40 through the space formed inside the housing unit 40 on the back side of the upper part. The connected piping can be drawn out to the upper part of the housing unit 40.

In the example shown in FIG. 4, the fixed metal plate 50 has a rectangular shape when viewed from the front. In the fixed metal plate 50, a hole 50a is formed at a position corresponding to a screw hole 52a1 formed in the flat plate portion 52a of the base metal plate 52. In the example shown in FIG. 4, the screw holes 52a1 of the flat plate part 52a of the base metal plate 52 are provided at two locations above and below, on the left and right sides of the flat plate part 52a, and similarly, the holes 50a of the fixed metal plate 50 are provided in the upper and lower parts of the flat plate part 52a. Two locations are provided at the top and bottom of the left and right sides of the sheet metal 50. Screws are inserted into the hole 50a of the fixed metal plate 50 and the screw hole 52a1 of the flat plate part 52a of the base metal plate 52, and the fixed metal plate 50 is fixed to the base metal plate 52. Note that it is sufficient that the fixed metal plate 50 can be stably fixed to the base metal plate 52, and the number and position of the holes 50a and screw holes 52a1 are not limited to the above numbers and positions.

Further, as shown in FIG. 3, an upper flange 50c extending rearward is formed at the upper edge of the fixed metal plate 50. As shown in FIG. 4, when the fixed plate 50 integrated with the second circuit part 2 is attached to the back plate 43 via the base plate 52, the upper flange 50c of the fixed plate 50 is attached to the upper end of the base plate 52. By being hooked, positioning is performed in the vertical direction (arrow Z direction). Then, when the fixing plate 50 to which the plurality of channel components of the second circuit section 2 are fixed to the base plate metal 52 fixed to the back plate metal 43 is fixed with a plurality of screws, the plurality of screws and The fixed metal plate 50 is supported by a base metal plate 52 via an upper flange 50c. Therefore, the load is distributed on the back metal plate 43. Inside the housing unit 40, the fixed metal plate 50 is arranged in a direction substantially parallel to the back metal plate 43.

As shown in FIG. 3, before the second circuit section 2 is assembled to the housing unit 40 (FIG. 4), all flow path components constituting the second circuit section 2 are integrated with the fixed sheet metal 50. It is preferable that However, if two or more flow path components that are part of the plurality of flow path components constituting the second circuit section 2 are integrated with the fixed sheet metal 50, assembly is easier compared to the conventional configuration. The effect of improvement can be obtained. In this case, it is particularly preferable that the channel components fixed to the stationary sheet metal 50 by the stationary component 51 be integrated with the stationary sheet metal 50 in advance. Further, among the plurality of flow path components constituting the second circuit section 2, flow path components that can be easily attached and detached from the front of the housing unit 40 to the second circuit section 2 are fixed in advance to the fixed sheet metal 50. Instead, it may be configured to be attached after assembly.

Further, as shown in FIG. 3, a lower flange 50b extending forward is formed at the lower end of the fixed metal plate 50. The lower flange 50b is provided with a hole 50b1 into which a screw 53 is inserted, and a first drain pan 71, which will be described later, is attached to the lower end of the fixed metal plate 50 by the screw 53 inserted into the hole 50b1 of the lower flange 50b. ing. The configuration of the first drain pan 71 will be described later.

As shown in FIG. 3, the first drain pan 71 is attached, the second circuit section 2 is fixed by the fixing component 51, and the fixed sheet metal 50 is integrated with the first drain pan 71 and the second circuit section 2. In the following description, it may be referred to as a second circuit assembly 99.

Here, based on FIG. 3, the arrangement of the plurality of channel components of the second circuit section 2 in the second circuit assembly 99 will be described. A plurality of flow path components constituting the second circuit section 2 are generally arranged in two vertical stages on the front side of a fixed metal plate 50, which will be described later. Specifically, in the second circuit section 2, the high temperature side hot water supply circuit C21 and the low temperature side hot water supply circuit C22 are arranged vertically in two stages. More specifically, the high temperature side main piping P23 is provided with the first water pump 6a of the high temperature side water supply circuit C21, and the low temperature side main pipe P23 is provided with the second water pump 6b and the mixing valve 23 of the low temperature side hot water supply circuit C22. The pipes P25 are arranged substantially parallel to each other so that their pipe axes are in the width direction (arrow X direction). That is, among the plurality of flow path components constituting the second circuit section 2, the first water pump 6a, the second water pump 6b, and the mixing valve 23, which are thicker than the piping, are arranged in two stages, one above the other. be done. The first water pump 6a of the high temperature side hot water supply circuit C21 and the second water pump 6b of the low temperature side hot water supply circuit C22, which are connected in parallel to each other in the second circuit section 2, are arranged vertically, and the second water pump 6a of the low temperature side hot water supply circuit C22 is connected in parallel with each other. The mixing valve 23 is arranged on the upstream side of the left and right sides of the water pump 6b.

In the example shown in FIG. 3, in the second circuit section 2, the first water supply circuit C22 of the low temperature side hot water supply circuit C22 supplies low temperature water above the high temperature side main pipe P23 in which the first water pump 6a of the high temperature side water supply circuit C21 is provided. A low-temperature side main pipe P25 provided with a two-water pump 6b is arranged. Further, the second inflow pipe P21 is connected to the high temperature side main piping P23 at a position to the left of the position where the first water pump 6a is provided in the high temperature side main piping P23, and the second water pump 6b is connected to the high temperature side main piping P25. A mixing valve 23 is provided at a position to the left of the position where the mixing valve 23 is provided.

On the other hand, among the plurality of flow path components constituting the second circuit section 2, the piping in which the first water pump 6a, the second water pump 6b, and the mixing valve 23 are not provided is located on the front side of the fixed metal plate 50, which will be described later. They are arranged in two tiers, front and back.

Specifically, the pipes connected to the external heating load, such as the high temperature side outgoing pipe P24, the low temperature side outgoing pipe P26, the high temperature side return pipe P29, and the low temperature side return pipe P30, are arranged in two stages, front and rear. The high-temperature side outgoing pipe P24 connected to the high-temperature side main pipe P23 and the low-temperature side outgoing pipe P26 connected to the low-temperature side main pipe P25 are arranged substantially parallel to each other so that, for example, the pipe axes are in the height direction (arrow Z direction). placed in front and back. In addition, the high temperature side return pipe P29 and the low temperature side return pipe P30, which are respectively connected to the other end of the high temperature side main pipe P23 via the return main pipe P28, have their tube axes aligned in the height direction (arrow Z direction). They are arranged approximately parallel to each other, in front and behind each other.

In the example shown in FIG. 3, the high temperature side outgoing pipe P24 is arranged in front of the low temperature side outgoing pipe P26, and has a bent shape so as to be connected to one end of the high temperature side main pipe P23. In the example shown in FIG. 3, the low temperature side return pipe P30 is arranged in front of the high temperature side return pipe P29 and has an L-shape so as to be connected to the middle of the main return pipe P28. The high temperature side outgoing pipe P24 and the low temperature side outgoing pipe P26 are arranged on the right side of the front side of the fixed sheet metal 50, which will be described later, and the high temperature side return pipe P29 and the low temperature side return pipe P30 are arranged on the front side of the fixed sheet metal 50, which will be described later. It is located on the left side.

In addition, among the pipes constituting the second circuit section 2, the return water feed pipe P32 of the bypass circuit C24 in which the first water pump 6a etc. are not provided is located in the middle of the high temperature side main pipe P23 and in addition to the low temperature side main pipe P25. It is arranged in front of the high temperature water feed pipe P27 that connects the end. The return water feed pipe P32 has an L-shaped bent shape so as to be connected to the mixing valve 23 provided in the low temperature side main pipe P25.

The configuration of the first drain pan 71 will be explained based on FIG. 3. The first drain pan 71 is disposed below the plurality of channel components constituting the second circuit section 2, and collects drain water generated in the second circuit section 2. The first drain pan 71 constitutes a part of the drainage section 70 (FIG. 7).

The first drain pan 71 is made of resin or the like, and has, for example, a rectangular shape when viewed from above. The width Wx of the first drain pan 71 in the width direction (direction of arrow It is also configured to be slightly larger. Further, the width Wy of the first drain pan 71 in the depth direction (direction of arrow Y) is the same as the width in the depth direction of the second circuit section 2 made up of a plurality of channel components, or the width Wy of the first drain pan 71 in the depth direction It is configured to be slightly larger than the width.

Therefore, as shown in FIG. 5, in a configuration in which a plurality of flow path components of the second circuit section 2 are fixed and integrated with a fixed plate metal 50 disposed in a direction substantially parallel to the rear plate metal 43, the first The width Wy (FIG. 3) of the drain pan 71 in the depth direction (arrow Y direction) can be made smaller than before. In addition, as a result, the width of the heat pump water heater 1 in the depth direction (direction of arrow Y) can be made smaller than before, making it easier to access various parts provided inside the housing unit 40 from the front. Improves work efficiency.

As shown in FIG. 3, a flange 71b extending upward is formed on the outer peripheral edge of the first drain pan 71, and a projection 71c having a screw hole is formed near the flange 71b on the back side on the upper surface of the first drain pan 71. There are several. In the example shown in FIG. 3, the protrusions 71c are provided at two locations on the left and right on the back side of the upper surface of the first drain pan 71, and similarly, the holes 50b1 of the lower flange 50b of the fixed sheet metal 50 are provided in the lower flange 50b. There are two locations on the left and right. The first drain pan 71 is attached to the fixed sheet metal 50 by inserting screws into the hole 50b1 of the lower flange 50b of the fixed sheet metal 50 and the screw hole of the protrusion 71c of the first drain pan 71.

Further, the first drain pan 71 is formed with a drain port 71a. As shown in FIG. 5, in a state where the second circuit assembly 99 is installed in the housing unit 40 on which the first circuit section 3 is mounted, the first drain pan 71 is arranged substantially horizontally. The drain port 71a is formed at the lowest position in the first drain pan 71. For example, the first drain pan 71 is arranged at a slight inclination from the horizontal so that the back side is lower than the front side in the depth direction (direction of arrow Y), and the drain port 71a is located at the rear edge which is the lowest position in the first drain pan 71. Formed near.

As shown in FIG. 4, the method for assembling the heat pump water heater 1 is to attach a fixed sheet metal 50 to which a plurality of channel components of the second circuit section 2 are fixed to a housing unit in which the first circuit section 3 is housed. 40. In other words, since the plurality of channel components of the second circuit section 2 are fixed to the fixed metal plate 50 and integrated, it is easy to fix the fixed plate 50 to the base plate 52 fixed to the rear plate metal 43. Then, the second circuit section 2 is assembled to the heat pump water heater 1. Further, since the first drain pan 71 is further fixed to the fixed sheet metal 50 to which the second circuit section 2 is fixed to constitute the second circuit assembly 99, the heat pump of the second circuit section 2 and the first drain pan 71 is Assembling to the water heater 1 can be done at once, improving the ease of assembling.

FIG. 6 is a right side view showing the configuration of a connecting portion R1 between the second circuit section 2 and the first circuit section 3 in the upper part of the heat pump water heater 1 of FIG. 5. FIG. The configuration of the connection portion R1 between the second circuit section 2 and the first circuit section 3 will be explained based on FIGS. 5 and 6. It is preferable that a connection method is applied to the piping connection between the second circuit section 2 and the first circuit section 3, which allows the piping to be connected to and detached from each other without using tools.

In the example shown in FIG. 5, the heat pump water heater 1 includes two fasteners 13 made of sheet metal, and the first circuit section 3 and the second circuit section 2 are connected by quick fasteners. One of the two fasteners 13 connects the first outflow pipe P14 of the first circuit section 3 and the second inflow pipe P21 of the second circuit section 2, as shown in FIG. Moreover, the other of the two fasteners 13 connects the second outflow pipe P22 of the second circuit section 2 and the first inflow pipe P15 of the first circuit section 3, as shown in FIG.

Referring to FIG. 6, the configuration of the connecting portion R1 when the first outflow pipe P14 of the first circuit portion 3 and the second inflow pipe P21 of the second circuit portion 2 are connected with a quick fastener will be described. The water outlet side of the first outflow pipe P14 of the first circuit section 3 and the water inlet side of the second inflow pipe P21 of the second circuit section 2 each form a joint 15, and the inner part of the joint 15 An O-ring 14 is installed. The joints 15 of the first outflow pipe P14 of the first circuit section 3 and the second inflow pipe P21 of the second circuit section 2 are brought into contact with each other and fixedly connected by the fastener 13 (quick fastener connection). O-rings 14 are installed inside both joints 15 to prevent water from leaking from the connecting portion of the C1 joint. Furthermore, the connection between the second outflow pipe P22 of the second circuit section 2 and the first inflow pipe P15 of the first circuit section 3 is also the same as that between the first outflow pipe P14 of the first circuit section 3 and the second inflow pipe P15 of the second circuit section 2. Similar to the connection with the inflow pipe P21, it is a quick fastener connection.

As shown in FIG. 5, the first circuit section 3 and the second circuit section 2 are connected by a fastener 13. Therefore, no tools are required when connecting the first circuit section 3 and the second circuit section 2 with the second circuit assembly 99 fixed to the housing unit 40 on which the first circuit section 3 is mounted. , the work can be made easier.

FIG. 7 is a left side view of the heat pump water heater 1 of FIG. 2. Since the heat pump water heater 1 is often used in areas where the temperature is relatively low, drain water is generated due to the temperature difference between the heat pump water heater 1 and the outside temperature. Drain water is generated particularly in the first circuit section 3 and the second circuit section 2, which include piping and the like. Therefore, the heat pump device 100 includes a drainage section 70 that discharges drain water to the outside of the housing unit 40.

As shown in FIG. 7, the drainage section 70 includes, for example, a first drain pan 71, a second drain pan 72, a first drain hose 74, a second drain hose 75, and the like. As described above, the first drain pan 71 is disposed below the second circuit section 2 and above the first circuit section 3, especially above the water storage tank 31, and collects drain water generated in the second circuit section 2. . The second drain pan 72 collects drain water generated in the first circuit section 3 and is arranged below the first drain pan 71. In the example shown in FIG. 7, the second drain pan 72 is installed on the bottom plate 44 of the housing unit 40. The first drain hose 74 is provided between the first drain pan 71 and the second drain pan 72 and guides the drain water from the second circuit section 2 collected in the first drain pan 71 to the upper surface of the second drain pan 72. It is something. The upper end of the first drain hose 74 is connected to the first drain pan 71, and the lower end of the first drain hose 74 is located slightly above the second drain pan 72. The second drain hose 75 connects the second drain pan 72 and a drain port (not shown) formed in the back metal plate 43 of the casing unit 40, and directs the drain water collected in the second drain pan 72 to the casing. It is for discharging the air out of the body unit 40.

FIG. 8 is a partially enlarged view showing the configuration around the connecting portion R2 between the first drain pan 71 and the first drain hose 74 in the heat pump water heater 1 of FIG. 7. FIG. As shown in FIG. 8, the heat pump water heater 1 includes a socket portion 73 that communicates with the drain port 71a of the first drain pan 71. As shown in FIG. The socket portion 73 extends below the first drain pan 71, and the upper end portion of the first drain hose 74 is attached to the socket portion 73.

As shown in FIG. 7, drain water from the second circuit section 2 disposed above the first circuit section 3 in the housing unit 40 is temporarily collected in the first drain pan 71. The drain water temporarily collected in the first drain pan 71 then flows to the first drain hose 74 via the drain port 71a and the socket part 73 (FIG. 8) of the first drain pan 71, and then flows through the first drain hose 74. After passing through, it is temporarily collected in the second drain pan 72. Further, the drain water from the first circuit section 3 is temporarily collected in the second drain pan 72. When the drain water accumulated in the second drain pan 72 exceeds a certain amount, it passes through the second drain hose 75 and is discharged outside through the drain port of the housing unit 40.

With such a configuration, the drain water from the second circuit section 2 is transferred to the first circuit section 3 without providing separate drainage ports for the first circuit section 3 and the second circuit section 2 in the housing unit 40. It can be discharged together with the drain water.

As described above, the heat pump water heater 1 of the first embodiment includes the first circuit section 3, the second circuit section 2 having a plurality of flow path components, and the first circuit section 3 and the second circuit section 2. It includes a housing unit 40 to be housed and a fixed metal plate 50. The first circuit section 3 circulates water and heats the water through heat exchange with a refrigerant, and the second circuit section 2 is connected to an external heating load and is heated by the first circuit section 3. The water is caused to flow to the heating load to radiate heat, and the water heated in the first circuit section 3 and the return water after the heat radiation are mixed. The fixed metal plate 50 has a plurality of channel components of the second circuit section 2 fixed thereto, and is attached to the housing unit 40 .

As a result, the fixed sheet metal 50 to which the plurality of channel components of the second circuit section 2 are fixed is attached to the housing unit 40, so that the second circuit section 2 is integrated with the fixed sheet metal 50 in advance, and the second circuit section 2 is There is no need to fix each channel component of the circuit section 2 to the housing unit 40. Therefore, when assembling the second circuit section 2 to the housing unit 40 in which the first circuit section 3 is provided, an increase in work according to the number of flow path components is suppressed, and the first circuit section 3 and the second circuit section 3 are assembled together. Even in the case of including the part 2, deterioration in assembling efficiency can be suppressed more than before.

Further, the second circuit section 2 is arranged above the first circuit section 3. As a result, the plurality of channel components of the second circuit section 2 are arranged at the upper part of the housing unit 40, so that the assembly position can be easily seen by the operator and the work can be performed easily.

The heat pump water heater 1 also includes a first drain pan 71 that is provided below the second circuit section 2 on the fixed sheet metal 50 and collects drain water generated in the second circuit section 2. As a result, drain water generated in the plurality of channel components of the second circuit section 2 through which water serving as a heat medium flows can be prevented from accumulating inside the housing unit 40, and Corrosion, etc. of various equipment installed can be suppressed.

Further, the second circuit section 2 is arranged above the first circuit section 3, and the heat pump water heater 1 includes a first drain pan 71 that collects drain water generated in the second circuit section 2, and a first drain pan 71 that collects drain water generated in the second circuit section 2. A second drain pan 72 and a first drain hose 74 are provided. The first drain hose 74 is connected to the first drain pan 71 and guides the drain water collected from the second circuit section 2 to the upper surface of the second drain pan 72 .

Thereby, the drain water collected from the second circuit section 2 in the first drain pan 71 can be combined with the drain water from the first circuit section 3 via the first drain hose 74, so that the housing unit 40 can share the same drainage port, eliminating the need to increase the number of drainage ports.

In addition, the second circuit section 2 includes, as a plurality of flow path components, a high temperature side main pipe P23 through which water heated by the first circuit section 3 (high temperature water) flows, and a high temperature side main pipe P23 through which mixed water (low temperature water) flows. It has a low temperature side main pipe P25. The second circuit section 2 also includes a first water pump 6a provided in the high temperature side main pipe P23 and a second water pump 6b provided in the low temperature side main pipe P25 as a plurality of flow path components. . The high temperature side main pipe P23 and the low temperature side main pipe P25 are arranged vertically and extend in the horizontal direction (arrow X direction).

As a result, the first water pump 6a and the second water pump 6b are arranged in the vertical direction (arrow Z direction), and the thickness of the heat pump water heater 1 can be reduced, and as a result, the thickness of the heat pump water heater 1 can be reduced to the depths of the housing unit 40. It becomes easier to reach, making maintenance and assembly easier. Furthermore, when the first drain pan 71 is provided in such a configuration, the width Wy of the first drain pan 71 in the depth direction (arrow Y direction) can be made smaller than before, and the thickness of the heat pump water heater 1 can be made thinner. In addition, the cost of the first drain pan 71 can be reduced.

Further, the heat pump water heater 1 includes a base metal plate 52 to which a fixed metal plate 50 is attached, and is provided on the inner surface of the back metal plate 43 of the housing unit 40. Thereby, the fixed metal plate 50 with which the second circuit section 2 is integrated can be assembled at a position in front of the back metal plate 43 in the housing unit 40, so that ease of assembly is improved.

The heat pump water heater 1 also includes a fastener 13 made of sheet metal that connects the piping of the second circuit section 2 (for example, the second inflow pipe P21) and the piping of the first circuit section 3 (for example, the first outflow pipe P14). It is equipped with Thereby, the second circuit part 2 and the first circuit part 3 can be connected to each other by the fastener 13, so that no tools are required for the connection of the pipes, and the assembly work is facilitated.

Furthermore, the method for assembling the heat pump water heater 1 according to the first embodiment is such that the fixed sheet metal 50 to which the plurality of channel components of the second circuit section 2 are fixed is attached to the housing unit 40 in which the first circuit section 3 is housed. It has a process of assembling it. Therefore, also in the method of assembling the heat pump water heater 1, deterioration in assembly efficiency can be suppressed more than in the past.

Embodiment 2.
FIG. 9 is a circuit configuration diagram of a heat pump device 100 according to the second embodiment. As shown in FIG. 9, a heat pump device 100 according to the second embodiment includes the heat pump water heater 1 according to the first embodiment and an outdoor unit 37.

The outdoor unit 37 includes a compressor 34 that compresses refrigerant, an air-refrigerant heat exchanger 36 that exchanges heat between the refrigerant and air, and an expansion valve 35 that reduces the pressure of the refrigerant. The compressor 34 of the outdoor unit 37, the refrigerant-water heat exchanger 32 of the heat pump water heater 1, the expansion valve 35 of the outdoor unit 37, and the air-refrigerant heat exchanger 36 are connected by refrigerant piping to form a refrigerant circuit. is formed.

In the heat pump water heater 1, water, which is a heat medium, is circulated through the connection circuit C12 of the first circuit section 3 by the water pump 6d, and the water is heated by heat exchange with the refrigerant in the refrigerant-water heat exchanger 32. heated. Water heated by the refrigerant, that is, high-temperature water, flows through the three-way valve 33 to the water-water heat exchanger 30 and the second circuit section 2. The high-temperature water flowing from the three-way valve 33 to the water-water heat exchanger 30 radiates heat to the hot water supply water circulating through the hot water supply side circuit C11 in the water-water heat exchanger 30, and then returns to the water supply from the second circuit section 2. The refrigerant flows into the refrigerant-water heat exchanger 32 again and is heated.

In the heat pump water heater 1, tap water is supplied from the water supply side 101 to the water storage tank 31 of the hot water supply side circuit C11 of the first circuit section 3 via the hot water supply water inflow pipe P11. Moreover, the hot water supply water stored in the water storage tank 31 is supplied to the hot water supply side 102 via the hot water supply water outflow pipe P12. The hot water supply water stored in the water storage tank 31 is circulated between the water-water heat exchanger 30 and the water storage tank 31 via a pipe P13 that connects the upper and lower parts of the water storage tank 31 by the hot water pump 6c. are doing. In the water-water heat exchanger 30, the hot water supply water is heated by heat exchange between the hot water supply water flowing through the piping P13 of the hot water supply side circuit C11 and the high temperature water flowing in from the three-way valve 33 in the connection circuit C12.

The second circuit section 2 of the heat pump water heater 1 uses the first water pump 6a to send high-temperature water to the heating load 103 on the high temperature side via the high temperature side outgoing piping P24, and sends high temperature water to the high temperature side heating load 103 through the low temperature side outgoing piping P26 using the second water pump 6b. The low-temperature water is sent to the heating load 104 on the low-temperature side via. In FIG. 9, the flow direction of high-temperature water flowing from the first circuit section 3 to the second circuit section 2 is indicated by a white arrow A1, and the flow direction of high-temperature water flowing from the second circuit section 2 to the first circuit section 3 is indicated by a white arrow A1. The flow direction of the return water from the circuit section 2 is indicated by a white arrow A6. Further, in FIG. 9, the flow direction of high temperature water sent from the second circuit section 2 to the heating load 103 on the high temperature side is indicated by a white arrow A2, and the flow direction of the high temperature water sent out from the second circuit section 2 to the heating load 103 on the high temperature side is returned from the heating load 103 on the high temperature side to the second circuit section 2. The direction of water flow is indicated by a white arrow A3. In addition, in FIG. 9, the flow direction of the low-temperature water in which high-temperature water and high-temperature return water are mixed and flowing from the second circuit section 2 toward the low-temperature side heating load 104 is indicated by a white arrow A4. The flow direction of the low-temperature return water returning from the load 104 to the second circuit section 2 is indicated by a white arrow A5. The operation of the second circuit section 2 is the same as that in the first embodiment, so a description thereof will be omitted.

As described above, the heat pump device 100 of the second embodiment includes the heat pump water heater 1 and the outdoor unit 37 equipped with the air-refrigerant heat exchanger 36 that exchanges heat between the refrigerant and the air. Thereby, in the heat pump device 100, the same effect as that obtained in the heat pump water heater 1 of the first embodiment can be obtained.

Note that each embodiment can be combined, or each embodiment can be modified or omitted as appropriate. For example, the configuration of the housing unit 40 is not limited to the above configuration, and may also include, for example, a support.

Further, for example, the connection configuration of the plurality of pipes in the second circuit section 2 is not limited to that shown in FIG. 3.

1 heat pump water heater, 2 second circuit section, 3 first circuit section, 6a first water pump, 6b second water pump, 6c water supply pump, 6d water pump, 13 fastener, 14 O-ring, 15 joint, 20 strainer , 23 mixing valve, 30 water heat exchanger, 31 water storage tank, 32 water heat exchanger, 33 three-way valve, 34 compressor, 35 expansion valve, 36 refrigerant heat exchanger, 37 outdoor unit, 40 housing unit, 41 front Panel, 42 Side panel, 43 Rear sheet metal, 43a Screw hole, 44 Bottom plate, 45 Top plate, 50 Fixed sheet metal, 50a Hole, 50b Lower flange, 50b1 Hole, 50c Upper flange, 51 Fixed part, 51a Peripheral part, 51b Fixed part , 52 base sheet metal, 52a flat plate part, 52a1 screw hole, 52b base fixing part, 52b1 hole, 52c connection part, 53 screw, 54 fixing screw, 70 drain part, 71 first drain pan, 71a drain port, 71b flange, 71c protrusion , 72 second drain pan, 73 socket part, 74 first drain hose, 75 second drain hose, 99 second circuit assembly, 100 heat pump device, 101 water supply side, 102 hot water supply side, 103 heating load, 104 heating load, C11 Hot water supply side circuit, C12 Connection circuit, C21 High temperature side hot water supply circuit, C22 Low temperature side hot water supply circuit, C23 Return circuit, C24 Bypass circuit, P11 Hot water supply water inflow pipe, P12 Hot water supply water outflow pipe, P13 Piping, P14 First outflow pipe, P15 1st inflow pipe, P21 2nd inflow pipe, P22 2nd outflow pipe, P23 High temperature side main pipe, P24 High temperature side outgoing pipe, P25 Low temperature side main pipe, P26 Low temperature side outgoing pipe, P27 High temperature water feed pipe, P28 Return main Piping, P29 High temperature side return piping, P30 Low temperature side return piping, P31 Return branch pipe, P32 Return water feed piping.

Claims (8)

a first circuit section in which water circulates and heats the water by heat exchange with a refrigerant;
Connected to an external heating load, the water heated by the first circuit section is caused to flow to the heating load to radiate heat, and the water heated by the first circuit section and return water after heat radiation are mixed. a second circuit section having a plurality of flow path components;
a housing unit in which the first circuit section and the second circuit section are housed;
The plurality of channel components of the second circuit section are fixed, and a fixed sheet metal is attached to the housing unit ,
The second circuit section is arranged above the first circuit section.
Heat pump water heater. The heat pump water heater according to claim 1 , further comprising a first drain pan that is provided below the second circuit section in the fixed sheet metal and collects drain water generated in the second circuit section. a second drain pan that is provided below the first circuit section and collects drain water generated in the first circuit section;
a drain hose connected to the first drain pan and guiding the drain water collected in the upper second circuit section to the upper surface of the second drain pan.
The heat pump water heater according to claim 2 . The second circuit section includes, as the plurality of flow path components,
a high-temperature side main pipe through which the water heated by the first circuit part flows and extends in the horizontal direction;
a low-temperature side main pipe through which the mixed water flows and extends laterally;
a first water pump provided in the high temperature side main piping;
a second water pump provided in the low temperature side main piping,
The heat pump water heater according to any one of claims 1 to 3 , wherein the high temperature side main piping and the low temperature side main piping are arranged one above the other. The heat pump water heater according to any one of claims 1 to 4 , further comprising a base metal plate provided on an inner surface of a back metal plate of the housing unit, to which the fixed metal plate is attached. The heat pump water heater according to any one of claims 1 to 5 , further comprising a sheet metal fastener that connects the piping of the second circuit section and the piping of the first circuit section. The heat pump water heater according to any one of claims 1 to 6 ,
A heat pump device comprising: an outdoor unit equipped with an air-refrigerant heat exchanger that exchanges heat between the refrigerant and air. a first circuit section in which water circulates and heats the water by heat exchange with a refrigerant;
Connected to an external heating load, the water heated by the first circuit section is caused to flow to the heating load to radiate heat, and the water heated by the first circuit section and return water after heat radiation are mixed. a second circuit section having a plurality of flow path components;
a housing unit in which the first circuit section and the second circuit section are housed;
The plurality of channel components of the second circuit section are fixed, and a fixed sheet metal is attached to the housing unit ,
The method for assembling a heat pump water heater in which the second circuit section is arranged above the first circuit section ,
A method for assembling a heat pump water heater, comprising the step of assembling the fixed sheet metal to which the plurality of channel components of the second circuit section are fixed to the housing unit in which the first circuit section is accommodated.

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