JP2024052196A - Heat pump device - Google Patents

Abstract

To provide a heat pump device which inhibits a refrigerant leaking from a refrigerant circuit from penetrating into an electrical equipment box.SOLUTION: A heat pump device 1 includes, in a housing 10, a machine room 13 in which a compressor 22 and an expansion device 24 are disposed and a blower room 12 in which a heat exchanger 20 and a blower are disposed. An electrical equipment box 30 is disposed on upper parts of the machine room 13 and the blower room 12, spanning the rooms. The electrical equipment box 30 includes an electrical equipment box body 32 and a lid member 33. In the electrical equipment box body 32, a ratio of a cubic capacity occupied by a machine side portion 32B is set smaller than that of a cubic capacity occupied by a blower side portion 32A and a length of a seal part between the electrical equipment box body 32 and the lid member 33 in the machine side portion 32B is set short.SELECTED DRAWING: Figure 2

Description

The present invention relates to a heat pump device.

Patent Document 1 discloses a heat pump device that includes a refrigerant circuit that circulates a flammable refrigerant, a water circuit (heat medium circuit) that circulates water (heat medium), and a water heat exchanger (heat medium heat exchanger) that exchanges heat between the refrigerant and water within a housing. An electrical box that houses a control board and the like is located at the top of the housing.

European Patent Application Publication No. 3312531

This disclosure provides a heat pump device that prevents refrigerant leaking from the refrigerant circuit from entering the electrical equipment box.

The heat pump device disclosed herein includes a machine chamber in which a compressor and an expansion device are disposed, and a blower chamber in which a heat exchanger and a blower are disposed within a housing, and an electrical box is disposed above the machine chamber and the blower chamber so as to straddle the chambers, and the electrical box includes an electrical box body and a lid member, and the electrical box body has a smaller volume occupied by the machine side portion than the volume occupied by the blower side portion, and the length of the seal between the electrical box body and the lid member in the machine side portion is shortened.

According to the present disclosure, if refrigerant leaks from the refrigerant circuit, it is possible to prevent the refrigerant from entering the electrical box.

FIG. 1 is a perspective view showing a heat pump device according to a first embodiment; FIG. 1 is an exploded perspective view showing a heat pump device according to a first embodiment; FIG. 1 is a front view showing a state in which a front panel of a heat pump device according to a first embodiment is removed; A circuit diagram showing a refrigerant circuit according to the first embodiment. FIG. 1 is an exploded perspective view showing an electrical box according to a first embodiment of the present invention; FIG. 1 is a vertical cross-sectional view showing an electrical box according to a first embodiment of the present invention; FIG. 1 is a plan view showing an electrical box according to a first embodiment of the present invention; FIG. 1 is a perspective view showing a heat pump device according to a first embodiment;

(Knowledge and other information that forms the basis of this disclosure)
At the time when the inventors came up with the idea of the present disclosure, there was a technique for preventing a flammable refrigerant from igniting in a heat pump device.
This heat pump device includes, within a housing, a refrigerant circuit that circulates a flammable refrigerant, a water circuit that circulates water, and a water heat exchanger that exchanges heat between the refrigerant and the water. The water circuit is provided with a refrigerant release valve, such as a pressure relief valve and an air vent valve, and the refrigerant release valve releases the refrigerant to the outside of the water circuit. In this way, even if a partition wall that separates the refrigerant circuit and the water circuit in the water heat exchanger is destroyed and flammable refrigerant gets mixed into the water circuit, the flammable refrigerant can be discharged into the water circuit via the pressure relief valve or the air vent valve.
However, the inventors discovered a problem with the above-mentioned heat pump device in that if the refrigerant leaks, the refrigerant will fill the housing, and there is a risk that the refrigerant will seep into the electrical equipment box. In order to solve this problem, they came up with the subject matter of the present disclosure.
In view of the above, the present disclosure provides a heat pump device that prevents refrigerant leaking from a refrigerant circuit from entering an electrical equipment box.

Hereinafter, the embodiments will be described in detail with reference to the drawings. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of already well-known matters or duplicate explanation of substantially the same configuration may be omitted. This is to avoid the following explanation becoming more redundant than necessary and to facilitate understanding by those skilled in the art.
It should be noted that the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

(Embodiment 1)
Hereinafter, the first embodiment will be described with reference to the drawings.
[1-1. Configuration]
[1-1-1. Configuration of heat pump device]
Fig. 1 is a perspective view of the heat pump device 1 according to the embodiment 1. Fig. 2 is an exploded perspective view of the heat pump device 1 according to the embodiment 1. Fig. 3 is a front view showing a state in which a front panel 16 of the heat pump device 1 according to the embodiment 1 is removed.
The heat pump device 1 shown in FIG. 1 is an outdoor unit that can be used as a so-called heat pump hot water heater.
1 to 3, the heat pump device 1 includes a box-shaped housing 10. In this embodiment, each part of the housing 10 is formed of a steel plate.

A partition plate 11 extending in the vertical direction is provided inside the housing 10. The partition plate 11 divides the internal space of the housing 10 into a blower chamber 12 and a machine chamber 13.
The housing 10 comprises a bottom plate 14 that forms the bottom surface of the housing 10, a pair of side panels 15 that cover the machine chamber 13 of the housing 10 from the front and rear, a front panel 16 that covers the front surface of the blower chamber 12, and a top plate 17 that covers the top surface of the housing 10.
The front panel 16 is provided with a ventilation section 18 formed in a mesh shape to allow air to pass through.

The blower chamber 12 is provided with a heat exchanger 20 and a blower 21 .
The heat exchanger 20 of this embodiment extends almost to the full height of the housing 10 and is formed in an approximately L-shape when viewed in a plane of the housing 10 so as to face the rear surface 10A and the side surface 10B of the housing 10.
The heat exchanger 20 may be, for example, a fin-tube type heat exchanger.
For example, an axial flow fan having a propeller-shaped impeller is used as the blower 21. The blower 21 is disposed such that the axial flow direction faces the ventilation section 18.

The interior of the machine room 13 accommodates various devices that form a refrigerant circuit, such as a compressor 22, a water heat exchanger (heat medium heat exchanger) 23, and an expansion device 24 (see FIG. 4), as well as refrigerant piping 25 that connects these devices to each other.
The water heat exchanger 23 may be, for example, a plate heat exchanger.
A cutout portion 26 is formed in the upper portion of the partition plate 11, and an electrical equipment box 30 is installed in this cutout portion 26.

[1-1-2. Configuration of the refrigerant circuit]
FIG. 4 is a circuit diagram showing the refrigerant circuit according to the first embodiment.
As shown in FIG. 4, the compressor 22, the four-way valve 27, the water heat exchanger 23, the expansion device 24 and the heat exchanger 20 are connected in a ring shape via a predetermined refrigerant pipe 25 to form a refrigerant circuit.
A predetermined water supply pipe 28 is connected to the water heat exchanger 23, and heat exchange between the water heat exchanger 23 and the refrigerant circulating in the refrigerant circuit is performed in the water heat exchanger 23.
The refrigerant compressed by the compressor 22 to a high temperature and pressure flows as shown by the solid arrow in Fig. 4 and is sent to the water heat exchanger 23, where it is cooled and condensed by heat exchange with water flowing through the water supply pipe 28. The water receives heat from the refrigerant and becomes hot water, which is supplied to, for example, a user device.
The refrigerant discharged from the water heat exchanger 23 is decompressed and evaporated in the expansion device 24, and undergoes heat exchange in the heat exchanger 20 to become a gas refrigerant, which is then returned to the compressor 22 again.

4, the refrigerant flows, exchanges heat with the outside air in the heat exchanger 20, is decompressed in the expansion device 24, and is sent to the water heat exchanger 23, thereby cooling the water flowing through the water supply pipe 28. The cold water is supplied to the user device.
In this embodiment, a flammable refrigerant is used as the refrigerant. The flammable refrigerant is R32 or a mixed refrigerant containing 70 weight percent or more of R32, or propane or a mixed refrigerant containing propane.
In addition, a non-flammable refrigerant may be used as the refrigerant instead of a flammable refrigerant.

[1-1-3. Configuration of electrical box]
Fig. 5 is an exploded perspective view showing the electrical equipment box 30 of the embodiment 1. Fig. 6 is a vertical cross-sectional view showing the electrical equipment box 30 of the embodiment 1. Fig. 7 is a plan view showing the electrical equipment box 30 of the embodiment 1. As shown in Fig. 2, the electrical equipment box 30 is disposed above the blower chamber 12 and the machine chamber 13, straddling the machine chamber 13 and the blower chamber 12.
The electrical box 30 is installed in the cutout portion 26 in the upper part of the partition plate 11 and is supported by the partition plate 11. As shown in Figs. 5 and 6, the electrical box 30 includes a box-shaped electrical box body 32 made of sheet metal having an opening 31 with an open top, and a resin lid member 33 formed in a substantially rectangular flat plate shape that closes the opening 31. The electrical box body 32 is made of a material with high thermal conductivity, such as a metal material. The lid member 33 is attached to the electrical box body 32 via an O-ring 38.

In this embodiment, the entire electrical box body 32 is made of a metal material, but only the portion located in the blower chamber 12 may be made of a metal material.

As shown in Figures 5 to 7, the electrical box body 32 has a rectangular blower side portion 32A located on the blower room 12 side in a plan view, and a substantially trapezoidal machine side portion 32B located on the machine room 13 side. The cover member 33 has a rectangular blower side portion 33A located on the blower room 12 side in a plan view, and a substantially trapezoidal machine side portion 33B located on the machine room 13 side.

The blower side portion 32A of the electrical box body 32 is equipped with a control board 40 made of a printed wiring board and other electronic components 43 electrically connected to the control board 40.

On the control board 40, electronic components such as semiconductor chips such as a CPU, transistors, capacitors, resistors, etc., which are not shown, are mounted to form electric circuits.
A heat sink 41 (heat sink) having a plurality of fins is attached to the underside of the control board 40, and the control board 40 is installed so that the heat sink 41 protrudes downward from a bottom opening 35 provided on the bottom of the blower side section 32A. The heat sink 41 is disposed on the bottom of the blower side section 32A close to the machine side section 32B of the electrical box main body 32. In this embodiment, one end of the heat sink 41 is located at the boundary between the machine side section 32B and the blower side section 32A. In other words, it is located at the boundary separated by the partition plate 11.
A sealant 42 is disposed around the periphery of the bottom opening 35 , and the control board 40 is fixed in place with the bottom opening 35 closed via the sealant 42 .

The machine side portion 32B of the electrical box body 32 has a main power line relay section 50 located at the front side and a lead wire relay section 53 located at the back side. The main power line relay section 50 has a terminal block 51 for connecting the main power line and a cable gland 52 that draws in and seals the main power line. The cable 45 drawn into the cable gland 52 is connected to a specified device such as the compressor 22. The lead wire relay section 53 has a lead wire relay module 55 for drawing in the lead wire.

A terminal block 51 for connecting the cable (main power line) 45 is arranged in the main power line relay section (space) 50. The main power line relay section 50 in which the terminal block 51 is arranged is partitioned by a partition plate 154, and the main power line relay section 50 is sealed within the electrical box body 32. The terminal block 51 is arranged on the partition plate 154A formed at an angle, and faces a window opening 152 formed on the side of the electrical box body 32. A window cover 155 for sealing the main power line relay section 50 is screwed into the window opening 152 with a sealant (not shown) sandwiched therebetween.

The cover member 33 is fixed to the upper end of the electrical box body 32 by fixing screws 37A to 37F via an O-ring 38. This makes the inside of the electrical box body 32 a sealed space. More specifically, as shown in FIG. 5, a flange 32F formed by bending sheet metal is formed on the periphery of the upper end of the electrical box body 32. As shown in FIG. 5, an O-ring groove 36 is formed on the periphery of the underside of the cover member 33, and an O-ring 38 is fitted into the O-ring groove 36, and the cover member 33 is fixed to the flange 32F by six fixing screws 37A to 37F. The O-ring 38 is made of foam rubber or chloroprene rubber.

The cover member 33 is fixed to the flange 32F of the machine side portion 32B of the electrical box body 32 with four fixing screws 37A to 37D, and is fixed to the flange 32F of the blower side portion 32A of the electrical box body 32 with two fixing screws 37E and 37F.

The electrical box body 32 has a smaller volume occupied by the machine side portion 32B than by the blower side portion 32A, and the machine side portion 32B of the electrical box body 32 is formed into a trapezoidal shape in a plan view by cutting the corners of the machine side portion 32B.
As a result, the length of the seal portion between the electrical box body 32 and the cover member 33 in the machine side portion 32B of the electrical box body 32 (the length of the O-ring 38) is set short.
In addition, the pitches P1 to P3 of the fixing screws 37A to 37D that fix the machine side portion 32B are set shorter than the pitches P4 to P6 of the fixing screws 37D to 37F that fix the blower side portion 32A. Since the machine side portion 32B has a short sealing length and the pitches P1 to P3 of the fixing screws 37A to 37D are set short, the sealing performance between the electrical box main body 32 and the lid member 33 in the machine side portion 32B can be improved.

In this embodiment, the machine side portion 32B of the electrical box body 32 is formed into a trapezoidal shape in a planar view by cutting the corners of the machine side portion 32B, but this is not limited thereto, and the machine side portion 32B may be formed into any other polygonal shape as long as the shape shortens the length of the sealed portion. In other words, the electrical box body 32 may be formed into any shape in a planar view as long as the circumferential length dimension of the machine side portion 32B is shortened.

Fig. 8 is a perspective view showing the heat pump device of the embodiment 1. Fig. 8 is a view of the heat pump device 1 as seen from the rear surface 10A and the machine chamber 13 side. In Fig. 8, the pair of side panels 15, the front panel 16 covering the front surface of the blower chamber 12, and the panels forming each of the rear surface 10A and the side surface 10B are omitted.
7 and 8 , the heat exchanger 20 is formed in an L-shape facing the rear surface 10A and the side surface 10B of the housing 10 in a plan view. A header pipe 29A and a vent portion 29B of the refrigerant piping are provided at one end in the longitudinal direction of the heat exchanger 20. The header pipe 29A and the vent portion 29B of the refrigerant piping face the rear surface 10A of the housing 10 and are disposed in the machine room 13.

In the machine room 13, the header pipe 29A and the vent portion 29B of the refrigerant piping are disposed in positions adjacent to the machine side portion 32B of the electrical box 30, the machine side portion 33B, and the seal portion of the machine side portion 32B.
In the machine room 13, a shielding member 60 is provided between the header pipe 29A and the vent portion 29B and the machine side portion 32B, the machine side portion 33B, and the machine side portion 32B. The shielding member 60 is a plate-shaped member made of a resin material. The shielding member 60 is attached to the partition plate 11 and extends along the cut corner of the machine side portion 32B in the circumferential direction of the electrical equipment box main body 32 in a plan view.
The shielding member 60 in this embodiment is formed so that the height dimension, which is the direction along the up-down direction of the housing 10, is longer than the height dimension of the electrical equipment box 30. As a result, in the electrical equipment box 30, the machine side portion 32B, the machine side portion 33B, and the machine side portion 32B adjacent to the header pipe 29A and the vent portion 29B are entirely shielded from the header pipe 29A and the vent portion 29B in the height direction.

In this way, by providing the shielding member 60 at a position adjacent to the seal portion of the machine side portion 32B in a position close to the header pipe 29A, even if the refrigerant ejects from the refrigerant circuit, the phenomenon of the refrigerant directly colliding with the vicinity of the seal portion is suppressed. Therefore, in the heat pump device 1, the mass transfer rate at which the refrigerant penetrates the O-ring 38 (e.g., foam rubber) can be reduced.

The shielding member 60 is not limited to a resin material, and may be formed from a foam material such as sponge or urethane, or a film-like material. For example, the shielding member 60 is not limited to being attached to the partition plate 11, and may be attached to the electrical box 30, the heat exchanger 20, or the like. For example, the shielding member 60 may be provided in a position that covers the window cover 155 or the cable gland 52. In addition, the shielding member 60 may be provided so as to cover the entire machine side portion 32B in the circumferential direction of the electrical box main body 32.

The electrical box 30 is positioned so that the height of the top surface of the cover member 33 is lower than the height of the top end of the heat exchanger 20. A ventilated space is formed between the top surface of the cover member 33 and the bottom surface of the top plate 17 of the housing 10.

As shown in FIG. 2, a partition member 39 is provided on the upper surface of the cover member 33. The partition member 39 is arranged at the boundary between the blower side portion 33A and the machine side portion 33B in a manner that closes the above-mentioned space. In other words, the upper surface 39A of the partition member 39 is in contact with the lower surface of the top plate 17. The partition member 39 has a plurality of openings 100 formed at equal intervals, and partial ventilation is possible between the machine chamber 13 and the blower chamber 12 through the openings 100.

[1-2. motion]
Next, the operation of the heat pump device 1 configured as above will be described.
When the heat pump device 1 is driven, the compressor 22 and the blower device 21 are operated, and the axial flow fan also starts to operate.
As a result, when hot water is used, the refrigerant compressed by the compressor 22 to a high temperature and pressure flows as shown by the solid arrow in FIG. 4 and is sent to the water heat exchanger 23. The water is cooled by heat exchange with water flowing through a water supply pipe 28 by the refrigerant 23, and the water is heated by the heat of the refrigerant and is supplied to a predetermined location.
The refrigerant discharged from the water heat exchanger 23 is decompressed in the expansion device 24, undergoes heat exchange in the heat exchanger 20, and becomes a gas refrigerant, which is returned to the compressor 22 again.

In addition, when cold water is used, by switching the four-way valve 27, the refrigerant flows as shown by the dashed arrows in Figure 4, exchanges heat with the outside air in the heat exchanger 20, is reduced in pressure in the expansion device 24, and is sent to the water heat exchanger 23, thereby cooling the water flowing through the water supply pipe 28.
During these operations, the blower device 21 is operated, so that air flows toward the electrical equipment box 30 located in the blower chamber 12 .

Furthermore, since a space allowing ventilation is formed between the lower surface of the top plate 17 of the housing 10 and the upper surface of the cover member 33 of the electrical equipment box 30 , air also flows over the upper surface of the cover member 33 .
These air flows allow the entire surface of the electrical box 30 to be cooled by air, and an increase in temperature of the electronic components 43 housed inside the electrical box 30 can be suppressed.

In addition, air flows through the heat sink 41 due to the operation of the blower 21. This allows the heat sink 41 to be cooled, and the control board 40 to be cooled through the heat sink 41.

The machine chamber 13 houses many connections of refrigerant piping, and is separated from the blower 21. In the heat pump device 1, if refrigerant leaks from the machine chamber 13, there is a risk that the refrigerant concentration in the machine chamber 13 will reach a predetermined value or higher.
In the electrical equipment box 30 of this embodiment, the electrical equipment box body 32 is formed so that the ratio of the volume occupied by the machine side portion 32B is smaller than the volume occupied by the blower side portion 32A.
As a result, the length of the seal portion (the length of the O-ring 38) between the electrical box body 32 and the cover member 33 in the machine side portion 32B of the electrical box body 32 is set short. Therefore, in the heat pump device 1, the amount of flammable refrigerant that infiltrates into the electrical box 30 from the machine chamber 13 can be suppressed. And, in the heat pump device 1, an increase in the refrigerant concentration inside the electrical box 30 can be suppressed.

[1-3. Effects, etc.]
As described above, the heat pump device 1 of the present embodiment includes, within the housing 10, the machine chamber 13 in which the compressor 22 and the expansion device 24 are disposed, and the blower chamber 12 in which the heat exchanger 20 and the blower device 21 are disposed. In the heat pump device 1, the electrical equipment box 30 is disposed above the machine chamber 13 and the blower chamber 12 so as to straddle the respective chambers. The electrical equipment box 30 includes an electrical equipment box main body 32 and a lid member 33. In the electrical equipment box 30, the proportion of the volume occupied by the machine side portion 32B is smaller than the volume occupied by the blower side portion 32A, and the length of the O-ring 38 in the machine side portion 33B is shortened.

As a result, in the electrical box 30, the length of the O-ring 38 between the electrical box body 32 and the cover member 33 in the machine side portion 32B of the electrical box body 32 can be set short. Therefore, in the heat pump device 1, the probability of flammable refrigerant entering the interior of the electrical box 30 from the machine chamber 13 is reduced.

In addition, in this embodiment, the electrical box main body 32 may be formed into a trapezoidal or polygonal shape by cutting the corners of the machine side portion 32B, thereby shortening the length of the seal portion between the electrical box main body 32 and the cover member 33 in the machine side portion 32B.
As a result, the length of the seal portion (the length of the O-ring 38) between the electrical box body 32 and the cover member 33 in the machine side portion 32B of the electrical box body 32 is set short, so that the O-ring 38 is exposed to the leaked refrigerant at a concentration equal to or higher than a predetermined level at fewer locations, improving the long-term durability of the O-ring 38.

In addition, in this embodiment, the pitches P1 to P3 of the fixing screws 37A to 37D that fix the machine side portion 32B of the electrical box main body 32 and the cover member 33 may be set shorter than the pitches P4 to P6 of the fixing screws 37D to 37F that fix the blower side portion 32A.
As a result, the machine side portion 32B has a short sealing length, and the pitches P1 to P3 of the fixing screws 37A to 37D are set short, so that in the electrical box 30, the sealing performance between the electrical box body 32 and the cover member 33 in the machine side portion 32B can be improved.

In addition, in this embodiment, the heat exchanger 20 is formed in an L-shape facing the rear surface 10A and side surface of the housing 10, and a shielding member 60 may be provided between the header pipe 29A of the heat exchanger facing the rear surface 10A of the housing and the mechanical side portion 32B of the electrical box main body 32.
As a result, in the heat pump device 1, even if the refrigerant gushes out from the refrigerant circuit, the phenomenon in which the refrigerant directly collides with the vicinity of the seal portion is suppressed. Therefore, in the heat pump device 1, the mass transfer rate at which the refrigerant permeates the O-ring 38 can be reduced.

In the present embodiment, the electrical box body 32 may be made of sheet metal, and the cover member 33 may be made of resin.
As a result, the electrical box body 32 is made of a material with high thermal conductivity, and the cover member 33 is made of a material with high flexibility and workability. Therefore, in the electrical box 30, the heat dissipation of the electrical components such as the control board 40 can be improved, and the cover member 33 can be easily formed.

Other Embodiments
As described above, the first embodiment has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made. In addition, it is also possible to combine the components described in the first embodiment to create a new embodiment.

In the above-described first embodiment, the heat pump device 1 is an outdoor unit that can be used for a so-called heat pump hot water heater. However, the present invention is not limited to this, and the heat pump device 1 can be applied to various devices equipped with a refrigerant circuit, such as a water heater or an air conditioner.

The above-described embodiments are intended to illustrate the technology disclosed herein, and various modifications, substitutions, additions, omissions, etc. may be made within the scope of the claims or their equivalents.

[Configuration supported by the above embodiment]
The above embodiment supports the following configurations.

(Additional Note)
(Technology 1) A heat pump device including a machine chamber in which a compressor and an expansion device are disposed, and a blower chamber in which a heat exchanger and a blower are disposed within a housing, wherein an electrical box is disposed above the machine chamber and the blower chamber so as to straddle the respective chambers, and the electrical box includes an electrical box main body and a cover member, the electrical box main body having a smaller volume occupied by the machine side portion than the volume occupied by the blower side portion, and the length of the seal portion between the electrical box main body and the cover member in the machine side portion is shortened.
According to this configuration, the length of the O-ring between the electrical box body and the cover member in the machine side portion of the electrical box body can be set short, which reduces the probability of the flammable refrigerant entering the electrical box from the machine chamber 13 in the heat pump device.

(Technology 2) The heat pump device described in Technology 1, in which the corners of the electrical box main body are cut off and formed into a polygonal shape on the machine side, thereby shortening the length of the seal portion between the electrical box main body and the cover member in the machine side portion.
According to this configuration, the length of the seal between the electrical box body and the cover member at the machine side of the electrical box body (the length of the O-ring) is set short, which reduces the number of places where the O-ring is exposed to the leaked refrigerant at a concentration above a predetermined level, thereby improving the long-term durability of the O-ring.

(Technology 3) The heat pump device according to Technology 1 or 2, wherein the pitch of the fixing screws connecting the electrical box body and the lid member is smaller on the machine side than on the blower side.
According to this configuration, the length of the sealing portion at the machine side portion is short, and the pitch of the fixing screws is set short, so that the sealing performance between the main body of the electrical equipment box and the lid member at the machine side portion of the electrical equipment box can be improved.

(Technology 4) A heat pump device described in any one of Technology 1 to Technology 3, wherein the heat exchanger is formed in an L-shape facing the rear and side surfaces of the housing, and a shielding member is provided between a header pipe of the heat exchanger facing the rear surface of the housing and the machine side portion of the electrical box main body.
According to this configuration, even if the refrigerant is ejected from the refrigerant circuit, the refrigerant is prevented from directly colliding with the vicinity of the seal portion, and therefore the mass transfer coefficient of the refrigerant permeating the O-ring can be reduced in the heat pump device.

(Technology 5) The heat pump apparatus according to any one of Technology 1 to Technology 3, wherein the electrical box body is made of sheet metal, and the cover member is made of resin.
According to this configuration, the electrical box body is made of a material with high thermal conductivity, and the cover member is made of a material with high flexibility and workability, which improves the heat dissipation of electrical components such as the control board in the electrical box, and also makes it easy to form the cover member.

This disclosure is suitable for use in heat pump devices that can suppress an increase in refrigerant concentration around electrical components housed in an electrical box in the event of a refrigerant leak.

REFERENCE SIGNS LIST 1 heat pump device 10 housing 12 blower room 13 machine room 20 heat exchanger 21 blower device (blower)
22 Compressor 24 Expansion device 30 Electrical equipment box 32 Electrical equipment box body 32A Blower side part 32B Machine side part 33 Lid member 33A Blower side part 33B Machine side part 38 O-ring 39 Partition member

Claims (5)

A heat pump apparatus including a machine chamber in which a compressor and an expansion device are disposed, and a blower chamber in which a heat exchanger and a blower are disposed,
An electrical equipment box is disposed above the machine room and the blower room so as to straddle the rooms;
The electrical equipment box includes an electrical equipment box body and a cover member.
A heat pump device in which the volume occupied by the electrical box body in the machine side portion is smaller than the volume occupied by the blower side portion, and the length of the seal portion between the electrical box body and the cover member in the machine side portion is shortened. The heat pump device according to claim 1, in which the corners of the electrical box body on the machine side are cut to form a polygonal shape, and the length of the seal between the electrical box body and the lid member on the machine side is shortened. The heat pump device according to claim 1 or 2, in which the pitch of the fixing screws between the electrical box body and the lid member is smaller on the machine side than on the blower side. The heat pump device according to claim 1 or 2, wherein the heat exchanger is formed in an L-shape facing the rear and side of the housing, and a shielding member is provided between the header pipe of the heat exchanger facing the rear of the housing and the machine side part of the main body of the electrical equipment box. The heat pump device according to claim 1 or 2, wherein the electrical box body is made of sheet metal and the cover member is made of resin.

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