JPWO2020017021A1 - Heat pump hot water supply outdoor unit - Google Patents

Abstract

The heat pump hot water supply outdoor unit according to the present invention includes a box-shaped heat insulating material and a water refrigerant heat exchanger that is housed in the heat insulating material and heats water with a refrigerant, and the inner bottom portion of the heat insulating material is a convex portion. It has a concave-convex shape having a concave portion, and a drain hole penetrating the inner bottom portion is formed in the concave portion, and the water-refrigerant heat exchanger is placed on the convex portion.

Description

The present invention relates to a heat pump hot water supply outdoor unit in which a water-refrigerant heat exchanger is housed in a box-shaped heat insulating material to reduce heat dissipation from the water-refrigerant heat exchanger to the outside.

Energy-efficient heat pump hot water supply systems that utilize the heat of the atmosphere are widely used. The heat pump hot water supply outdoor unit of the heat pump hot water supply system includes an evaporator that absorbs the heat of the atmosphere into the refrigerant, a blower that blows air to the evaporator, a compressor that compresses the refrigerant, and water that heats water with a compressed high-temperature and high-pressure refrigerant. It is equipped with a refrigerant heat exchanger and the like. Further, in order to reduce heat dissipation from the water refrigerant heat exchanger to the outside during the operation of the heat pump hot water supply outdoor unit, the water refrigerant heat exchanger is housed in a box-shaped heat insulating material. When the water-refrigerant heat exchanger is housed in a box-shaped heat insulating material, the water-refrigerant heat exchanger may corrode as follows. Specifically, when dew condensation occurs on the surface of the water-refrigerant heat exchanger, the water on the surface of the water-refrigerant heat exchanger flows down and collects on the inner bottom of the heat insulating material. If the water-refrigerant heat exchanger is immersed in the water accumulated in the inner bottom of the heat insulating material, the water-refrigerant heat exchanger may be corroded. Therefore, it is desirable to prevent the water-refrigerant heat exchanger from being immersed in the water accumulated in the inner bottom of the heat insulating material. The inner bottom portion of the heat insulating material is the bottom portion on the inner side of the heat insulating material.

Therefore, a conventional heat pump hot water supply outdoor unit has been proposed in which the water-refrigerant heat exchanger is prevented from being immersed in the water accumulated in the inner bottom portion of the heat insulating material (see Patent Document 1). Specifically, in the heat pump hot water supply outdoor unit described in Patent Document 1, the heat insulating material for accommodating the water refrigerant heat exchanger is composed of a lower heat insulating material and an upper heat insulating material. The lower heat insulating material is a box-shaped heat insulating material having an opening at the upper part and long in the left-right direction. The upper heat insulating material is a heat insulating material that covers the upper opening of the lower heat insulating material.

The inner bottom portion of the lower heat insulating material has a flat portion, and the water-refrigerant heat exchanger is placed on the flat portion. Further, the inner bottom portion of the lower heat insulating material is provided with a water leakage discharge portion in order to prevent water from accumulating in the inner bottom portion. The water leakage discharge portion includes a through hole penetrating the inner bottom portion of the lower heat insulating material and a filling material for sealing the through hole. According to Patent Document 1, with such a configuration, the water that has flowed down to the inner bottom portion of the lower heat insulating material flows through the through hole while permeating or dissolving the filling material, and is discharged to the outside of the heat insulating material.

JP-A-2015-45425

In the heat pump hot water supply outdoor unit described in Patent Document 1, a water leakage discharge portion is provided on a flat portion of an inner bottom portion of a lower heat insulating material in which a water refrigerant heat exchanger is placed. Therefore, when dew condensation occurs on the surface of the water refrigerant heat exchanger and the water on the surface of the water refrigerant heat exchanger flows down to the flat portion of the inner bottom of the lower heat insulating material, until the water is discharged from the leak discharge portion. During that time, the water refrigerant heat exchanger will be immersed in the water. Further, since the portion of the inner bottom portion of the lower heat insulating material where the water refrigerant heat exchanger is placed is a flat portion as described above, the water that has flowed down to the flat portion tends to stay in the flat portion. Therefore, the water accumulated in the flat portion does not flow into the leaking discharge portion until a certain amount of water is accumulated in the flat portion. Therefore, the heat pump hot water supply outdoor unit described in Patent Document 1 cannot sufficiently suppress the water-refrigerant heat exchanger from being immersed in the water accumulated in the inner bottom of the heat insulating material, and the water-refrigerant heat exchanger is still sufficiently corroded. There was a problem that it could not be suppressed.

The present invention has been made to solve the above-mentioned problems, and even if dew condensation occurs in the water-refrigerant heat exchanger housed in the box-shaped heat insulating material, the water-refrigerant heat exchanger can be used more than before. It is an object of the present invention to provide a heat pump hot water supply outdoor unit capable of suppressing immersion in water.

The heat pump hot water supply outdoor unit according to the present invention includes a box-shaped heat insulating material and a water refrigerant heat exchanger that is housed in the heat insulating material and heats water with a refrigerant, and the inner bottom portion of the heat insulating material is a convex portion. It has a concave-convex shape having a concave portion, and a drain hole penetrating the inner bottom portion is formed in the concave portion, and the water-refrigerant heat exchanger is placed on the convex portion.

In the heat pump hot water supply outdoor unit according to the present invention, when dew condensation occurs on the surface of the water refrigerant heat exchanger and the water on the surface of the water refrigerant heat exchanger flows down to the inner bottom portion of the heat insulating material, the water flows down to the inner bottom portion of the inner bottom portion. It collects in the recess. Then, the water accumulated in the recess is discharged to the outside of the heat insulating material from the drain hole formed in the recess. Therefore, the heat pump hot water supply outdoor unit according to the present invention suppresses the immersion of the water refrigerant heat exchanger in water as compared with the conventional case even when dew condensation occurs in the water refrigerant heat exchanger housed in the box-shaped heat insulating material. it can.

It is a piping system diagram which shows the heat pump hot water supply system provided with the heat pump hot water supply outdoor unit which concerns on embodiment of this invention. It is a perspective view which observed the heat pump hot water supply outdoor unit which concerns on embodiment of this invention from the front right side. It is an exploded perspective view which observed the heat pump hot water supply outdoor unit which concerns on embodiment of this invention from the front right side. It is a perspective view which observed the bottom plate, the upper heat insulating material, the lower heat insulating material, the water refrigerant heat exchanger and the like provided in the heat pump hot water supply outdoor unit which concerns on embodiment of this invention from the front right side. It is a perspective view which observed the bottom plate, the lower heat insulating material, the water refrigerant heat exchanger and the like provided in the heat pump hot water supply outdoor unit which concerns on embodiment of this invention from the front right side. It is a perspective view which observed the lower heat insulating material provided in the heat pump hot water supply outdoor unit which concerns on embodiment of this invention from the front right side. It is a vertical cross-sectional view which cut the lower heat insulating material provided in the heat pump hot water supply outdoor unit which concerns on embodiment of this invention in the vertical plane parallel to the lateral direction of the lower heat insulating material. It is a vertical cross-sectional view which cut the lower heat insulating material provided in the heat pump hot water supply outdoor unit which concerns on embodiment of this invention in the vertical plane parallel to the longitudinal direction of the lower heat insulating material.

In the following embodiment, an example of the heat pump hot water supply outdoor unit according to the present invention will be described with reference to the drawings. The elements common to each figure are designated by the same reference numerals to simplify or omit duplicate explanations. Further, the heat pump hot water supply outdoor unit according to the present invention may include any combination of the configurations described below that can be combined.

Embodiment.
FIG. 1 is a piping system diagram showing a heat pump hot water supply system including a heat pump hot water supply outdoor unit according to an embodiment of the present invention. As shown in FIG. 1, the heat pump hot water supply system 90 includes a heat pump hot water supply outdoor unit 1 and a tank unit 91. The heat pump hot water supply outdoor unit 1 is installed outdoors. The tank unit 91 may be installed outdoors or indoors.

The heat pump hot water supply outdoor unit 1 includes a compressor 2, a water refrigerant heat exchanger 3, a first expansion valve 4a, a second expansion valve 4b, an evaporator 5, an internal heat exchanger 6, and a blower 7. The heat pump hot water supply outdoor unit 1 includes a refrigerant circuit and operates a refrigeration cycle, that is, a heat pump cycle. The compressor 2 compresses the low pressure refrigerant. The refrigerant may be, for example, carbon dioxide. The water-refrigerant heat exchanger 3 includes a refrigerant pipe 3b through which a high-temperature and high-pressure refrigerant discharged from the compressor 2 flows, and a water pipe 3a through which water supplied from the tank unit 91 flows. Then, in the water-refrigerant heat exchanger 3, heat exchange is performed between the high-temperature and high-pressure refrigerant flowing through the refrigerant pipe 3b and the water flowing through the water pipe 3a. That is, the water flowing through the water pipe 3a is heated by the high-temperature and high-pressure refrigerant flowing through the refrigerant pipe 3b.

The first expansion valve 4a and the second expansion valve 4b are examples of a pressure reducing device that reduces the pressure of the high pressure refrigerant into the low pressure refrigerant. The decompressed low-pressure refrigerant is in a gas-liquid two-phase state. The evaporator 5 is a heat exchanger that exchanges heat between the low-pressure refrigerant and the atmosphere. In the evaporator 5, the low-pressure refrigerant evaporates by absorbing the heat of the atmosphere. When the blower 7 blows air to the evaporator 5, heat exchange in the evaporator 5 can be promoted. The internal heat exchanger 6 includes a high-pressure flow path and a low-pressure flow path. The internal heat exchanger 6 exchanges heat between the high-pressure refrigerant flowing through the high-pressure flow path and the low-pressure refrigerant flowing through the low-pressure flow path. The low-pressure refrigerant vaporized by the evaporator 5 is sucked into the compressor 2 via the low-pressure flow path of the internal heat exchanger 6.

The tank unit 91 includes a hot water storage tank 92, a pump 93, a flow path switching valve 94, and a bypass pipe 95. The heat pump hot water supply outdoor unit 1 and the tank unit 91 are connected via an external pipe 96 and an external pipe 97.

Water before heating and hot water after heating are stored in the hot water storage tank 92. In the hot water storage tank 92, a temperature stratification with a high temperature on the upper side and a low temperature on the lower side is formed due to the difference in the specific gravity of water depending on the temperature. A hot water supply pipe (not shown) for supplying hot water to terminals such as a hot water tap, a shower, and a bathtub is connected to the upper part of the hot water storage tank 92. A water supply pipe (not shown) for supplying water from a water source such as tap water is connected to the lower part of the hot water storage tank 92. When hot water is supplied from the hot water storage tank 92, the hot water in the upper part of the hot water storage tank 92 is sent to the hot water supply pipe by the water pressure acting on the hot water storage tank 92 from the water supply pipe. The same amount of water as the hot water flowing out to the hot water supply pipe flows into the hot water storage tank 92 from the water supply pipe, so that the inside of the hot water storage tank 92 is maintained in a full state.

The lower part of the hot water storage tank 92 is connected to the inlet of the pump 93 via a conduit. The outlet of the pump 93 is connected to the flow path switching valve 94. The flow path switching valve 94 is connected to the water pipe 3a of the water refrigerant heat exchanger 3 of the heat pump hot water supply outdoor unit 1 via an external pipe 96.

The heat pump hot water supply system 90 can carry out a heat storage operation in which hot water heated by the heat pump hot water supply outdoor unit 1 is stored in the hot water storage tank 92. At the time of heat storage operation, it becomes as follows. The compressor 2, the blower 7, and the pump 93 are operated. The water flowing out from the lower part of the hot water storage tank 92 flows into the water-refrigerant heat exchanger 3 of the heat pump hot water supply outdoor unit 1 through the pump 93, the flow path switching valve 94, and the external pipe 96. This water is heated by the refrigerant in the water refrigerant heat exchanger 3 to become hot water. The temperature of the hot water heated by the water refrigerant heat exchanger 3 is, for example, about 65 ° C. to 90 ° C. The hot water flowing out of the water-refrigerant heat exchanger 3 returns to the tank unit 91 through the external pipe 97, and flows into the upper part of the hot water storage tank 92 through the tank upper pipe 98.

The flow path switching valve 94 can switch the flow path so that the water discharged from the pump 93 flows into the tank upper pipe 98 through the bypass pipe 95 instead of the heat pump hot water supply outdoor unit 1.

FIG. 2 is a perspective view of the heat pump hot water supply outdoor unit according to the embodiment of the present invention observed from the front right side. FIG. 3 is an exploded perspective view of the heat pump hot water supply outdoor unit according to the embodiment of the present invention observed from the front right side. As shown in FIG. 2, the heat pump hot water supply outdoor unit 1 includes a plurality of legs 25. The legs 25 are fixed to the ground or the floor surface.

As shown in FIG. 3, the heat pump hot water supply outdoor unit 1 includes a bottom plate 18, a front panel 19, a side panel 20, and a top panel 21. The bottom plate 18, the front panel 19, the side panel 20, and the top panel 21 constitute an outer shell, that is, a housing of the heat pump hot water supply outdoor unit 1. The bottom plate 18, the front panel 19, the side panel 20, and the top panel 21 are preferably made of metal. The bottom plate 18 corresponds to the base or frame of the heat pump hot water supply outdoor unit 1. The components such as the compressor 2 are mounted on the bottom plate 18. The legs 25 are fixed to the lower surface of the bottom plate 18.

The front panel 19 covers the front surface and the left side surface of the heat pump hot water supply outdoor unit 1. The side panel 20 covers a part of the rear surface and the right side surface of the heat pump hot water supply outdoor unit 1. The top panel 21 covers the upper surface of the heat pump hot water supply outdoor unit 1. The evaporator 5 is arranged so as to cover the rear surface and the left side surface of the heat pump hot water supply outdoor unit 1.

The inside of the outer shell of the heat pump hot water supply outdoor unit 1 is divided into a blower room 15 in which the blower 7 is located and a machine room 14. The partition plate 16 separates the blower chamber 15 and the machine chamber 14. A compressor 2, a refrigerant pipe, and the like are arranged in the machine room 14. The compressor 2 is covered with a soundproofing material (not shown). In the blower chamber 15, the blower 7 is arranged between the evaporator 5 and the front panel 19. The blower 7 in the present embodiment includes a propeller fan. Further, in the blower room 15, a case 8 is arranged under the blower 7. The water-refrigerant heat exchanger 3 is housed in the case 8 in a state of being covered with the upper heat insulating material 9 and the lower heat insulating material 10 which will be described later.

The front panel 19 has an opening formed at a position facing the blower 7. A grill 24 covering this opening is attached to the front panel 19. When the blower 7 is operated, the outside air, that is, the atmosphere, passes through the evaporator 5 and flows into the blower chamber 15, and is discharged from the grill 24 to the outside of the heat pump hot water supply outdoor unit 1.

The heat pump hot water supply outdoor unit 1 includes an electric component storage box 17. The electric component storage box 17 is arranged in a space that occupies a part of the upper part of the blower room 15 and the upper part of the machine room 14. In the electric component storage box 17, for example, electric components such as an inverter power supply that drives and controls the motor of the compressor 2 and the motor of the blower 7 are stored. There is a terminal block near the electrical component storage box 17. The terminal block is used when connecting the external electric wiring to the electric component in the electric component storage box 17. The service panel 22 is detachably attached to the side panel 20. The service panel 22 protects the terminal block. Under the service panel 22, a connection cover 23 is detachably attached to the side panel 20. The connection portion cover 23 protects a connection portion (not shown) to which the external pipe 96 and the external pipe 97 are connected.

FIG. 4 is a perspective view of a bottom plate, an upper heat insulating material, a lower heat insulating material, a water refrigerant heat exchanger, and the like provided in the heat pump hot water supply outdoor unit according to the embodiment of the present invention, observed from the front right side. As shown in FIG. 4, the bottom plate 18 has a shape in which a plurality of irregularities, steps, slopes, and the like having a height difference of, for example, about 1 cm are formed. The bottom plate 18 may be formed by press working such as drawing. The bottom plate 18 has a water-shielding property.

A drainage port (not shown) is formed on the bottom plate 18. It is desirable that this drainage port is at the lowest position among the bottom plates 18. Since the temperature of the evaporator 5 becomes low during the operation of the heat pump hot water supply outdoor unit 1, the moisture contained in the air passing through the evaporator 5 may condense on the surface of the evaporator 5. The condensed water flows down due to gravity. The bottom plate 18 receives the water. The water flows toward the position of the drain port due to the height difference formed on the bottom plate 18, and is discharged from the drain port to the bottom of the bottom plate 18.

The place where the heat pump hot water supply outdoor unit 1 is installed may be provided with a hopper or the like for receiving the water discharged from the drain port. By forming the drainage port on the bottom plate 18, the following effects can be obtained. Since the bottom plate 18 collects the condensed water generated on the surface of the evaporator 5 and drains it from the drain port to the outside of the heat pump hot water supply outdoor unit 1, it is possible to prevent water from coming out from a place other than the drain port. It is possible to surely prevent the user from misunderstanding that the heat pump hot water supply outdoor unit 1 is leaking water.

By housing the water-refrigerant heat exchanger 3 in a box-shaped heat insulating material, it is possible to reduce heat dissipation to the outside during operation of the heat pump hot water supply outdoor unit 1. The box-shaped heat insulating material in the present embodiment has a structure divided into upper and lower parts, and has a box-shaped lower heat insulating material 10 for accommodating the water refrigerant heat exchanger 3 inside and a lid-shaped heat insulating material covering the upper surface side thereof. It is composed of an upper heat insulating material 9.

FIG. 5 is a perspective view of a bottom plate, a lower heat insulating material, a water refrigerant heat exchanger, and the like provided in the heat pump hot water supply outdoor unit according to the embodiment of the present invention, observed from the front right side. The D1 direction indicated by the arrow in FIG. 5 represents the left-right direction of the heat pump hot water supply outdoor unit 1. That is, the D1 direction represents the left-right direction of the lower heat insulating material 10 and the water refrigerant heat exchanger 3. Further, the D2 direction indicated by the arrow in FIG. 5 represents the front-rear direction of the heat pump hot water supply outdoor unit 1. That is, the D2 direction represents the front-rear direction of the lower heat insulating material 10 and the water refrigerant heat exchanger 3.

The internal space of the lower heat insulating material 10 has a substantially rectangular parallelepiped shape that is long in the left-right direction. The water-refrigerant heat exchanger 3 is placed on the inner bottom portion 10a of the lower heat insulating material 10. The inner bottom portion 10a of the lower heat insulating material 10 is a bottom portion on the inner side of the lower heat insulating material 10. The water refrigerant heat exchanger 3 is a tubular heat exchanger such as a double tube type. The water-refrigerant heat exchanger 3 has a structure in which the water-refrigerant heat exchanger 3 is laminated in the vertical direction while being bent into a rectangular shape corresponding to the shape of the internal space of the lower heat insulating material 10. That is, when the water-refrigerant heat exchanger 3 is viewed in a plan view, the left-right direction is the longitudinal direction and the front-rear direction is the lateral direction.

FIG. 6 is a perspective view of the lower heat insulating material included in the heat pump hot water supply outdoor unit according to the embodiment of the present invention, observed from the front right side. FIG. 7 is a vertical cross-sectional view of the lower heat insulating material provided in the heat pump hot water supply outdoor unit according to the embodiment of the present invention, cut along a vertical plane parallel to the lateral direction of the lower heat insulating material. Further, FIG. 8 is a vertical cross-sectional view of the lower heat insulating material provided in the heat pump hot water supply outdoor unit according to the embodiment of the present invention, cut along a vertical plane parallel to the longitudinal direction of the lower heat insulating material.

The inner bottom portion 10a of the lower heat insulating material 10 has a concave-convex shape having a convex portion 12 and a concave portion 13. Specifically, the inner bottom portion 10a of the lower heat insulating material 10 includes a plurality of convex portions 12 extending in the lateral direction when the lower heat insulating material 10 is viewed in a plan view. The plurality of convex portions 12 are arranged at predetermined intervals. A portion lower than the plurality of convex portions 12 is formed between the plurality of convex portions 12, and the portion is a concave portion 13. At least one drain hole 11 penetrating the inner bottom portion 10a is formed in the recess 13. In the first embodiment, a plurality of drain holes 11 are formed. Then, the water-refrigerant heat exchanger 3 is placed on the plurality of convex portions 12.

Therefore, in the heat pump hot water supply outdoor unit 1 according to the present embodiment, dew condensation occurs on the surface of the water refrigerant heat exchanger 3, and the water on the surface of the water refrigerant heat exchanger 3 is discharged from the inner bottom portion 10a of the lower heat insulating material 10. When the water flows down to, the water collects in the recess 13 of the inner bottom portion 10a. Then, the water accumulated in the recess 13 is discharged to the outside of the lower heat insulating material 10 from the drain hole 11 formed in the recess 13. The water-refrigerant heat exchanger 3 is raised with respect to the concave portion 13 by the convex portion 12. Therefore, in the heat pump hot water supply outdoor unit 1 according to the present embodiment, even if dew condensation occurs on the water refrigerant heat exchanger 3 housed in the box-shaped heat insulating material, the water refrigerant heat exchanger 3 is more water than before. It is possible to suppress immersion in the water. That is, the heat pump hot water supply outdoor unit 1 according to the present embodiment can suppress the corrosion of the water refrigerant heat exchanger 3 as compared with the conventional case.

The water discharged from the drain hole 11 to the outside of the lower heat insulating material 10 flows down to the bottom plate 18. As described above, the water that has flowed down to the bottom plate 18 flows toward the position of the drain port due to the height difference formed in the bottom plate 18, and is discharged from the drain port to the bottom of the bottom plate 18.

Further, in the present embodiment, the recess 13 is provided with an inclined surface 13a that is inclined so as to descend toward the drain hole 11. By providing the inclined surface 13a, the water accumulated in the recess 13 can be quickly discharged from the drain hole 11 to the outside of the lower heat insulating material 10 as compared with the case where the inclined surface 13a is not provided. Therefore, since the recess 13 is provided with the inclined surface 13a, it is possible to further suppress the immersion of the water-refrigerant heat exchanger 3 in water. That is, since the recess 13 is provided with the inclined surface 13a, the corrosion of the water-refrigerant heat exchanger 3 can be further suppressed. The recess 13 according to the present embodiment has a plurality of inclined surfaces 13a, but if it has at least one inclined surface 13a, the above-mentioned effect can be obtained.

Further, in the present embodiment, each drain hole 11 is formed at the lower end portion 13c of the inclined surface 13a. In other words, in the recess 13 according to the present embodiment having the plurality of inclined surfaces 13a, each drain hole 11 is formed in the valley portion formed by the plurality of inclined surfaces 13a. By forming the drain hole 11 at the lower end 13c of the inclined surface 13a, the water accumulated in the recess 13 can be more quickly discharged from the drain hole 11 to the outside of the lower heat insulating material 10, and the water refrigerant heat exchanger 3 Corrosion can be further suppressed. That is, by forming the drain hole 11 in the lower end portion 13c of the inclined surface 13a, the corrosion of the water refrigerant heat exchanger 3 can be further suppressed. If at least one of the drain holes 11 is formed in the lower end portion 13c of the inclined surface 13a, the effect can be obtained.

Further, in the present embodiment, when the lower heat insulating material 10 is viewed in a plan view, a part of the convex portion 12 is located at the apex 13b of the inclined surface 13a. That is, a part of the convex portion 12 is arranged at the highest portion in the concave portion 13. By arranging the convex portion 12 in this way, the height of protrusion of the convex portion 12 from the concave portion 13 can be suppressed low, so that the material cost of the lower heat insulating material 10 can be suppressed.

Further, in the recess 13 according to the present embodiment having the plurality of inclined surfaces 13a, at least a part of the plurality of inclined surfaces 13a is inclined in the front-rear direction, and at least one of the plurality of inclined surfaces 13a. The part is inclined in the left-right direction. In the present embodiment, all the inclined surfaces 13a are inclined in the front-rear direction and also in the left-right direction. The heat pump hot water supply outdoor unit 1 may be installed at an angle in the left-right direction. The heat pump hot water supply outdoor unit 1 may be installed at an angle in the front-rear direction. Further, the heat pump hot water supply outdoor unit 1 may be installed at an angle in both the left-right direction and the front-rear direction. When the recess 13 includes a plurality of inclined surfaces 13a, the inclination direction of the inclined surface 13a is defined as described above, so that the recess 13 can be installed even when the heat pump hot water supply outdoor unit 1 is installed at an inclination in any direction. The water accumulated in the lower heat insulating material 10 can be discharged to the outside of the lower heat insulating material 10 more quickly.

The inner bottom portion 10a of the lower heat insulating material 10 according to the present embodiment includes a plurality of convex portions 12, but the number of the convex portions 12 is arbitrary. For example, by making the shape of the convex portion 12 a substantially frame shape in a plan view, the water refrigerant heat exchanger 3 can be placed on one convex portion 12. Here, when the inner bottom portion 10a includes a plurality of convex portions 12, it is preferable to arrange each convex portion 12 as shown in FIGS. 6 and 8. Specifically, it is preferable that the plurality of convex portions 12 are arranged at intervals in the longitudinal direction of the water-refrigerant heat exchanger 3 when the water-refrigerant heat exchanger 3 is viewed in a plan view. By arranging the plurality of convex portions 12 in this way, the deflection of the water-refrigerant heat exchanger 3 can be suppressed. That is, it is possible to prevent the water-refrigerant heat exchanger 3 from bending and being immersed in the water accumulated in the recess 13.

Further, in the present embodiment, in the vertical cross section, the corner portion 12a of the convex portion 12 has an arc shape that is convex to the outside of the convex portion 12. By forming the corner portion 12a of the convex portion 12 in such a shape, the contact area between the water refrigerant heat exchanger 3 and the upper surface of the convex portion 12 can be reduced. Further, by forming the corner portion 12a of the convex portion 12 in such a shape, the water that has flowed down from the water refrigerant heat exchanger 3 to the upper surface of the convex portion 12 is less likely to stay on the upper surface of the convex portion 12. Therefore, by forming the corner portion 12a of the convex portion 12 in such a shape, the time during which the water-refrigerant heat exchanger 3 is in contact with water can be shortened, and the corrosion of the water-refrigerant heat exchanger 3 can be further suppressed. ..

As described above, the heat pump hot water supply outdoor unit 1 according to the present embodiment includes a box-shaped heat insulating material and a water refrigerant heat exchanger 3 housed in the heat insulating material and heating water with a refrigerant. The inner bottom portion 10a of the lower heat insulating material 10 of the heat insulating material has a concave-convex shape having a convex portion 12 and a concave portion 13. A drain hole 11 penetrating the inner bottom portion 10a is formed in the recess 13. The water-refrigerant heat exchanger 3 is placed on the convex portion 12 of the inner bottom portion 10a.

In the heat pump hot water supply outdoor unit 1 according to the present embodiment, dew condensation occurred on the surface of the water refrigerant heat exchanger 3, and the water on the surface of the water refrigerant heat exchanger 3 flowed down to the inner bottom portion 10a of the lower heat insulating material 10. At that time, the water collects in the recess 13 of the inner bottom portion 10a. Then, the water accumulated in the recess 13 is discharged to the outside of the lower heat insulating material 10 from the drain hole 11 formed in the recess 13. The water-refrigerant heat exchanger 3 is raised with respect to the concave portion 13 by the convex portion 12. Therefore, in the heat pump hot water supply outdoor unit 1 according to the present embodiment, even if dew condensation occurs on the water refrigerant heat exchanger 3 housed in the box-shaped heat insulating material, the water refrigerant heat exchanger 3 is more water than before. It is possible to suppress immersion in the water. That is, the heat pump hot water supply outdoor unit 1 according to the present embodiment can suppress the corrosion of the water refrigerant heat exchanger 3 as compared with the conventional case.

1 heat pump hot water supply outdoor unit, 2 compressor, 3 water refrigerant heat exchanger, 3a water piping, 3b refrigerant piping, 4a first expansion valve, 4b second expansion valve, 5 evaporator, 6 internal heat exchanger, 7 blower, 8 Case, 9 Upper heat insulating material, 10 Lower heat insulating material, 10a Inner bottom, 11 Drain hole, 12 Convex part, 12a Square part, 13 Concave part, 13a Inclined surface, 13b Top, 13c Lower end, 14 Machine room, 15 Blower room , 16 Partition plate, 17 Electrical parts storage box, 18 Bottom plate, 19 Front panel, 20 Side panel, 21 Top panel, 22 Service panel, 23 Connection cover, 24 Grill, 25 Legs, 90 Heat pump hot water supply system, 91 Tank unit , 92 Hot water storage tank, 93 pump, 94 flow path switching valve, 95 bypass pipe, 96 external pipe, 97 external pipe, 98 tank upper pipe.

The heat pump hot water supply outdoor unit according to the present invention includes a box-shaped heat insulating material and a water refrigerant heat exchanger that is housed in the heat insulating material and heats water with a refrigerant, and the inner bottom portion of the heat insulating material has a convex portion and a concave portion. In the concave portion, a drain hole penetrating the inner bottom portion is formed, the water refrigerant heat exchanger is placed on the convex portion, and the inner bottom portion has a plurality of convex portions. The plurality of convex portions are arranged at intervals in the longitudinal direction of the water-refrigerant heat exchanger when the water-refrigerant heat exchanger is viewed in a plan view .

Claims (7)

Box-shaped heat insulating material and
A water-refrigerant heat exchanger that is housed in the heat insulating material and heats water with a refrigerant.
With
The inner bottom portion of the heat insulating material has a concave-convex shape having convex portions and concave portions.
A drainage hole penetrating the inner bottom portion is formed in the recess.
The water-refrigerant heat exchanger is a heat pump hot water supply outdoor unit placed on the convex portion. The heat pump hot water supply outdoor unit according to claim 1, wherein the recess has an inclined surface that is inclined so as to descend toward the drain hole. The heat pump hot water supply outdoor unit according to claim 2, wherein a part of the convex portion is located at the apex of the inclined surface when the heat insulating material is viewed in a plan view. The heat pump hot water supply outdoor unit according to claim 2 or 3, wherein the drain hole is formed at the lower end of the inclined surface. The recess comprises the plurality of inclined surfaces.
At least a part of the plurality of inclined surfaces is inclined in the front-rear direction.
The heat pump hot water supply outdoor unit according to any one of claims 2 to 4, wherein at least a part of the plurality of inclined surfaces is inclined in the left-right direction. The inner bottom portion includes a plurality of the convex portions.
Any of claims 1 to 5, wherein the plurality of convex portions are arranged at intervals in the longitudinal direction of the water-refrigerant heat exchanger when the water-refrigerant heat exchanger is viewed in a plan view. The heat pump hot water supply outdoor unit described in item 1. The heat pump hot water supply outdoor unit according to any one of claims 1 to 6, wherein the corner portion of the convex portion has an arc shape that is convex to the outside of the convex portion in the vertical cross section.

Images