Heat source unit

Abstract

To provide a heat source unit capable of easily connecting external wiring to an electronic component while isolating the electronic component.SOLUTION: A heat source unit is provided in a refrigeration cycle device using a flammable refrigerant, and includes a housing 10 and an electric box 30 housed in the housing 10. The electric box 30 forms a housing space R partitioned from an inner space S of the housing 10, and an electronic component is disposed in the housing space R. The electric box 30 includes a first opening through which the housing space R communicates with the outside of housing 10.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a heat source unit. [Background technology]

[0002] Patent Document 1 discloses a refrigeration cycle device that reduces the risk of fire caused by electrical components as an ignition source even when a flammable refrigerant leaks from a refrigerant pipe. The interior of the main casing of this refrigeration cycle device is divided into a machine chamber and a blower chamber by a partition member. The machine chamber contains a compressor and refrigerant pipes through which the flammable refrigerant flows. The blower chamber contains an outdoor fan and electrical components. The electrical components include a circuit board on which heat-generating components are mounted and a sealing member that seals the circuit board. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-88895 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides a heat source unit that isolates electronic components while allowing external wiring to be easily connected to the electronic components. [Means for solving the problem]

[0005] The heat source unit of the present disclosure is a heat source unit of a refrigeration cycle device that uses a flammable refrigerant, and comprises a housing and an electrical box housed in the housing, the electrical box forms a storage space separated from the internal space of the housing, electronic components are arranged in the storage space, and the electrical box is provided with a first opening that connects the storage space with the outside of the housing. [Effects of the Invention]

[0006] According to the present disclosure, external wiring can be easily connected to electronic components while isolating the electronic components. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is an exploded perspective view of an outdoor unit of an air conditioning apparatus according to an embodiment of the present disclosure. [Figure 2] Front view of outdoor unit [Figure 3] Perspective view of the electrical box [Figure 4] Exploded perspective view of the electrical box [Figure 5] A longitudinal section cut along plane V in Figure 3 [Figure 6] A longitudinal cross-sectional view of wiring integrally molded with a sealing member. [Figure 7] FIG. 10 is a perspective view of an electrical box according to a modified example. [Figure 8] FIG. 10 is a perspective view of an electrical box according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0008] (Findings that formed the basis of this disclosure) At the time the inventors arrived at the idea of ​​the present disclosure, there was a technology in which, in a heat source unit of a refrigeration cycle device that uses a flammable refrigerant and has a housing that is divided into an air blower chamber and a machine chamber, electronic components are housed in an electrical box that is located in the air blower chamber where the air blower is located. This prevents the refrigerant from leaking into the electrical box in the case of a refrigerant leak in such a heat source unit. Such a heat source unit is connected to various devices and components, such as a compressor, and electronic components, which are arranged in a machine room, via wiring drawn from an electrical equipment box.

[0009] However, in the heat source unit described above, it is necessary to arrange a wiring connection portion in the machine room that connects the wiring extending from the electrical box to various devices and components, such as a compressor, that are arranged in the machine room, and the wiring connection portion needs to be isolated from the internal space of the housing. For this reason, the inventors discovered a problem in such a heat source unit that the number of components increases and the wiring routing and connection structure may become complicated, and have come to constitute the subject matter of the present disclosure in order to solve this problem. Therefore, the present disclosure provides a heat source unit that can easily connect external wiring to electronic components while isolating the electronic components.

[0010] Hereinafter, embodiments will be described in detail with reference to the drawings. However, unnecessary detailed description may be omitted. For example, detailed description of well-known matters or redundant description of substantially the same configuration may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art. 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.

[0011] (Embodiment 1) Hereinafter, the first embodiment will be described with reference to Figures 1 to 6. The symbol FR shown in each figure indicates the front of the outdoor unit 1 when it is installed on an installation surface and in normal use, the symbol UP indicates the top of the outdoor unit 1, and the symbol LH indicates the left of the outdoor unit 1. In the following description, each direction is along the direction of the outdoor unit 1. [1-1.Configuration] [1-1-1.Outdoor unit configuration] Fig. 1 is an exploded perspective view of an outdoor unit 1 of an air conditioner according to the present embodiment. Fig. 2 is a front view schematically showing the internal structure of the outdoor unit 1. For ease of explanation, the front panel of the housing 10 is omitted in Fig. 2. The air conditioner of this embodiment includes an indoor heat exchanger housed in an indoor unit (not shown), and a refrigeration circuit formed by a compressor 2 housed in an outdoor unit 1 shown in Figures 1 and 2, a heat exchanger 8, an expansion valve (not shown), etc. The air conditioner conditions the conditioned space in which the indoor unit is installed by circulating a refrigerant through this refrigeration circuit.

[0012] In this embodiment, a flammable refrigerant is used as the refrigerant flowing through the refrigerant circuit, such as R32, propane, or a mixed refrigerant containing these.

[0013] The outdoor unit 1 of this embodiment is a so-called side-blowing type heat source unit that draws air inside through an outdoor heat exchanger 8 arranged along the left side and back, exchanges heat with the refrigerant, and blows the air out from the front. The outdoor unit 1 corresponds to the "heat source unit" of the present disclosure.

[0014] 1 and 2, the outdoor unit 1 includes a box-shaped housing 10. The housing 10 forms the exterior of the outdoor unit 1. A partition plate 24, which is a sheet metal member, is provided inside the housing 10. The partition plate 24 divides the internal space S of the housing 10 into an air blowing chamber S1 and a machine chamber S2.

[0015] The housing 10 comprises a bottom panel 12 that forms the bottom surface, a top panel 14 that forms the top surface, a front panel 16 that forms the front surface, a left side panel 18 that forms the left side surface, and a right side panel 20 that forms the right side surface, and is formed so that the back surface is an opening.

[0016] An exhaust port 19 is provided in the front panel 16. This exhaust port 19 is an opening that connects the outside of the housing 10 with the air blowing chamber S1. In this embodiment, the exhaust port 19 is covered with a lattice-shaped protective member 26.

[0017] The left side panel 18 is located on the opposite side of the partition plate 24 across the air blower chamber S1, and forms the left side of the housing 10. The left side panel 18 is provided with an air intake port, which is an opening that connects the outside of the housing 10 with the air blower chamber S1.

[0018] The right side panel 20 is located on the opposite side of the partition plate 24 across the machine chamber S2, and forms the right side of the housing 10. A service valve 6 to which predetermined external piping can be connected is provided at the bottom of the right side panel 20. A side opening 21, which is a through-hole that connects the machine chamber S2 to the outside of the housing 10, is provided at the top of the right side panel 20. A part of the electrical box 30 housed inside the housing 10 is inserted into the side opening 21. A cover member 22 is attached to the right side panel 20.

[0019] As shown in FIG. 2, an outdoor heat exchanger 8 is provided in the blower chamber S1. The outdoor heat exchanger 8 of this embodiment is a so-called fin-and-tube heat exchanger. The outdoor heat exchanger 8 has multiple metal fins joined to copper refrigerant piping. The outdoor heat exchanger 8 is arranged so that its width direction coincides with the height direction of the housing 10 and its length direction faces the back and left side faces of the housing 10. The outdoor heat exchanger 8 is folded into a substantially L-shape in a plan view of the housing 10 and is housed in the air blower chamber S1. The outdoor heat exchanger 8 may be a heat exchanger of another form, such as a heat exchanger including flat tubes and a header pipe.

[0020] 2, the blower chamber S1 of this embodiment is provided with a blower 7 and a blower fan 9. The blower fan 9 is an axial flow fan that has a propeller-shaped impeller and is disposed so that the axial flow direction faces the exhaust port 19.

[0021] The machine room S2 accommodates the compressor 2, various devices forming a refrigeration circuit such as an expansion valve and an on-off device (not shown), refrigerant piping connecting these devices to each other, various electronic components, and the like.

[0022] 2, the partition plate 24 is a plate-like member whose longitudinal direction extends along the vertical direction of the housing 10 and whose direction perpendicular to the longitudinal direction extends along the front-rear direction of the housing 10. The partition plate 24 has a lower end connected to the bottom panel 12, an upper end abutting the top panel 14, and a front end connected to the front panel 16.

[0023] A cutout 27 is provided at the upper end of the partition plate 24. An electrical box 30 is inserted into the cutout 27. The electrical box 30 is a box-shaped member that houses a control device that controls each part of the outdoor unit 1 or the entire air conditioning apparatus including the indoor unit. In this embodiment, the electrical box 30 is supported by the partition plate 24 and the upper end of the outdoor heat exchanger 8.

[0024] [1-1-2. Configuration of the electrical box] Next, the electrical box 30 will be described. 3 is a perspective view of the electrical box 30, FIG. 4 is an exploded perspective view of the electrical box 30, and FIG. 5 is a vertical cross-sectional view taken along plane V in FIG. 3. Plane V is a plane perpendicular to the front-rear direction and the plane of the sealing member 49. As shown in FIG. 3, the electrical box 30 includes a box-shaped electrical box body 32 in which a storage space R is provided. The electrical box body 32 includes a circuit board storage section 34 whose longitudinal direction extends in the left-right direction, and a wire connection storage section 36 provided at the right end of the circuit board storage section 34. The electrical box body 32 of this embodiment is entirely formed from a resin material, and the circuit board storage section 34 and the wire connection storage section 36 are formed integrally.

[0025] As shown in Fig. 5, a packing attachment portion 31A is provided on the outer periphery of an opening 31 provided on the top surface of the substrate storage portion 34. The opening 31 corresponds to the "second opening" of the present disclosure. A packing 38 made of a flexible material such as rubber is attached to the packing attachment portion 31A, and the opening 31 is closed by a flat lid 33 via the packing 38. The lid 33 is made of a material with high thermal conductivity, for example, a metal material. This allows the electrical box 30 to more easily dissipate heat generated by the operation of the control device and various electronic components housed in the electrical box 30 .

[0026] As shown in FIG. 3, the substrate storage section 34 includes a blower-side portion 34A located on the blower chamber S1 side, and a machine chamber-side portion 34B located on the machine chamber S2 side. The height dimension of the fan-side section 34A from the top end to the bottom surface of the board storage section 34 is shorter than the height dimension of the machine room-side section 34B. In other words, the bottom surface of the fan-side section 34A is located higher than the bottom surfaces of the other parts of the board storage section 34. As shown in FIG. 4, a heat dissipation opening 35, which is a through-hole that connects the inside and outside of the fan-side portion 34A, is provided on the bottom surface of the fan-side portion 34A.

[0027] The board storage section 34 has a board space R1 formed therein, and stores a control board 40, which is a printed wiring board that functions as a control device, and other electronic components electrically connected to the control board 40. The control board 40 is equipped with electronic components such as transistors, capacitors, and resistors to form electronic circuits.

[0028] A heat sink 42 having a plurality of fins is attached to the underside of the control board 40. The control board 40 is housed in the board housing portion 34 so that the heat sink 42 protrudes downward from the heat dissipation opening 35, and the heat sink 42 is placed in the ventilation chamber S1 in a state where it is exposed to the outside of the electrical box 30.

[0029] A sealant 48 is provided around the periphery of the heat radiation opening 35. The control board 40 is fixed to the board housing portion 34 via the sealant 48 in a state in which the heat radiation opening 35 is closed. In this way, the heat sink 42 is exposed from the electrical box body 32 at the blower-side portion 34A and disposed in the ventilation chamber S1 while maintaining the airtightness of the electrical box 30. This allows the electrical box 30 to be cooled by the blown air at the portion located in the ventilation chamber S1, thereby cooling the electronic components housed in the electrical box 30.

[0030] Additionally, a plurality of through holes 37 that penetrate in the vertical direction are provided in the bottom surface of the machine room side portion 34B. In this embodiment, the through holes 37 are formed in a circular shape in a plan view. Wiring 90 is inserted through the through holes. The wiring 90 is a power line or a signal line that connects the control board 40 to various devices that form the refrigeration circuit, such as the compressor 2 housed in the machine room S2 and an expansion valve.

[0031] 6 is a vertical cross-sectional view showing the wiring 90 integrally molded with the sealing member 49. In FIG. 6, a vertical cross-sectional view of the sealing member 49 taken along plane IV in FIG. A sealing member 49 is provided integrally with the wiring 90. The sealing member 49 is made of a flexible resin material such as rubber and is formed in a cylindrical shape. As shown in Fig. 6, the sealing member 49 is formed integrally with the wiring 90 by injection molding in a mold into which the wiring 90 has been inserted.

[0032] 5, a sealing member 49 that ensures airtightness with the wiring 90 is fitted into each through hole 37. As described above, the sealing member 49 is elastically deformable and is formed in a circular shape in a plan view. As a result, when the sealing member 49 is fitted into the through hole 37, pressure is applied uniformly over the entire circumferential surface. This allows the electrical box 30 to maintain airtightness.

[0033] As shown in FIGS. 3 and 4, the circuit board housing section 34 is provided with sheet metal covers 44, 46 that cover predetermined portions of the side and bottom surfaces of the blower side section 34A and the machine room side section 34B. The sheet metal cover 44 covers the blower side portion 34A, and is provided with a cover opening 45, which is a through-hole having substantially the same shape as the heat dissipation opening 35, at a position overlapping the heat dissipation opening 35. The sheet metal cover 44 is provided with a fixing portion 43 that is fixed to the partition plate 24. The sheet metal cover 46 covers the machine chamber side portion 34B, and at positions overlapping with the through holes 37, cover openings 47, which are through holes having substantially the same shape as the through holes 37, are provided. In this way, by providing the metal sheet covers 44, 46, the fire resistance of the electrical box 30 can be improved.

[0034] The wire connection storage section 36 is formed in a rectangular parallelepiped shape with a wire connection space R2 provided therein. The wire connection storage section 36 is connected to a corner formed by the side surface and the bottom surface located on the right side of the board storage section 34. As shown in FIG. 5, the board space R1 and the wire connection space R2 are connected to each other by a communication passage P.

[0035] 4, the wire connection storage section 36 is formed so as to be able to store a plurality of terminal blocks 50. The terminal blocks 50 correspond to the "wiring connection section" of the present disclosure. A wire 92 extending from the control board 40 and inserted into the communication path P is connected to the terminal block 50. The wire 92 is a power line. The wire connection storage section 36 may store not only the terminal block 50 but also various types of wiring connectors.

[0036] 5, a wire lead-in hole 51, which is a through-hole that connects the inside and outside of the wire connection storage section, is provided on the bottom surface of the wire connection storage section 36. The wire lead-in hole 51 corresponds to the "wire lead-in section" of the present disclosure. A plurality of cable glands 52 are provided in the wiring lead-in hole 51. The cable glands 52 correspond to the "sealing member" of the present disclosure.

[0037] The cable gland 52 is an inlet through which the wires 94 extending from the outside of the housing 10 are drawn into the inside of the wire connection housing 36 while ensuring waterproof and dustproof properties. The wiring 94 is a power line connected to the outside of the housing 10. In this embodiment, the wiring 94 is inserted through the cable gland 52. The wiring 94 is connected to the terminal block 50 and is connected to the control board 40 via the wiring 92 . In the air conditioner, by forming the outdoor unit 1 in this manner, it is possible to supply power to the control board 40 while ensuring waterproof and dustproof properties.

[0038] In addition, an air conditioning apparatus equipped with an outdoor unit 1 can form an air conditioning system equipped with multiple indoor units by connecting multiple indoor units to an electrical box 30 equipped with multiple terminal blocks 50 and cable glands 52. The terminal block 50 may be connected to a power cable connected to a commercial power source, instead of the wiring 92 extending from the indoor unit.

[0039] The entire right side surface of the wire connection storage section 36 is opened to form an opening 39. The opening 39 corresponds to the "first opening" of the present disclosure. The opening 39 is closed by a flat lid 54 via a packing 56 made of a flexible material such as rubber. The lid 54 is made of a material with high strength and durability, such as a metal material.

[0040] As shown in Fig. 1 , the wire connection storage section 36 is inserted into the side opening 21 so that the side surface located on the right and the cable gland 52 are each accessible from outside the housing 10 by workers such as installation and maintenance personnel. As a result, in the outdoor unit 1, when the cover member 22 is removed, the opening 39 and the lid 54 are located outside the housing 10. Furthermore, when the lid 54 is removed, the terminal block 50 is exposed to the outside of the housing 10 through the side opening 21. As a result, in the outdoor unit 1, workers can easily perform wiring and wire connection work on the terminal block 50. As described above, in the outdoor unit 1, the opening 39 and the lid body 54, together with the service valve 6, are covered by the cover member 22.

[0041] [1-2. Operation] The operation of the outdoor unit 1 configured as above will now be described. When the outdoor unit 1 starts operating, the compressor 2, blower 7, various expansion valves, on-off devices, etc. start operating under the control of the control board 40. As the blower 7 rotates, air from outside the housing 10 flows into the air chamber S1 through an opening in the back surface and an opening in the left side panel 18. Because the heat sink 42 is disposed in the air chamber S1, the control board 40 is cooled by the air flowing into the air chamber S1 via the heat sink 42. The air that has flowed into the air chamber S1 is exhausted to the outside of the housing 10 through the exhaust port 19.

[0042] In the present embodiment, the control board 40 is housed in a sealed electrical box 30, and is thereby isolated from the internal space S of the housing 10. Therefore, in the outdoor unit 1, even if a flammable refrigerant leaks inside the housing 10, the refrigerant is prevented from reaching the control board 40.

[0043] When connecting the wiring 94 in the outdoor unit 1, the worker removes the cover member 22 and then the lid 54. This exposes the terminal block 50, allowing the worker to connect the wiring 94 inserted through the cable gland 52 to the terminal block 50. In this way, in the outdoor unit 1, the control board 40 is isolated from the internal space of the housing 10, while the terminal block 50 is placed in the wiring space R2 that can communicate with the outside of the housing 10, so that the wiring 94 outside the housing 10 can be easily connected to the control board 40.

[0044] [1-3. Effects, etc.] As described above, in the present embodiment, the outdoor unit 1 is a heat source unit of a refrigeration cycle device that uses a flammable refrigerant, and includes a housing 10 and an electrical box 30 housed in the housing 10. The electrical box 30 has a storage space R that is separated from the internal space S of the housing 10, and a control board 40 is disposed in the storage space R. The electrical box 30 has an opening 39 that connects the storage space R to the outside of the housing 10.

[0045] As a result, in the outdoor unit 1, the control board 40 can be isolated from the internal space of the housing 10 by the electrical box 30, while the wiring 94 outside the housing 10 can be easily connected to the control board 40.

[0046] As in this embodiment, the electrical box 30 contains a terminal block 50 to which at least a portion of the wiring connected to the control board 40 is connected to wiring outside the housing 10, and the terminal block 50 is exposed to the outside of the housing 10 through the first opening. This allows the wiring 94 outside the housing 10 of the outdoor unit 1 to be easily connected to the control board 40.

[0047] As in this embodiment, the terminal block 50 is connected to wiring outside the housing 10. As a result, the outdoor unit 1 can be connected to an indoor unit by providing the electrical box 30 with the terminal block 50 and the cable gland 52. Therefore, the outdoor unit 1 can form an air conditioning system.

[0048] As in this embodiment, the electrical box 30 is provided with a through hole 37 that connects the storage space R with the internal space S. Wiring 90 connected to the control board 40 passes through the through hole 37, and the through hole 37 is sealed with a sealing member 49 that is formed integrally with the wiring 90 connected to the control board 40. This allows the wiring 90 to be routed from the inside to the outside of the electrical box 30 while ensuring airtightness in the electrical box 30.

[0049] As in this embodiment, the sealing member 49 is flexible and formed in a cylindrical shape. As a result, when the sealing member 49 is fitted into the through-hole 37, pressure is distributed over the entire circumferential surface, thereby improving the degree of sealing of the electrical box 30.

[0050] As in this embodiment, the wire connection housing portion 36 is provided with a cable gland 52 that draws the wiring outside the housing 10 into the housing space R with the electrical box 30 sealed. This allows the wiring 94 to be routed from the inside to the outside of the electrical box 30 while ensuring airtightness in the electrical box 30.

[0051] In this embodiment, the electrical box 30 has an opening 31 that connects the inside and outside of the electrical box 30 at a position that overlaps at least a portion of the control board 40, and the openings 31 and 39 are each covered by a cover body 33, 54 that is both made of a metal material. As a result, in the electrical box 30, the heat dissipation performance in the board housing portion 34 and the wire housing portion 36 can be improved.

[0052] As in this embodiment, the lid 54 that covers the opening 39 is covered by the cover member 22 provided on the housing 10. As a result, in the outdoor unit 1, the wire connection storage section 36, the opening 39, and the lid body 54 can be protected by the cover member 22.

[0053] As in this embodiment, at least a portion of the electrical box 30 is made of a metal material. This improves the fire resistance of the electrical box 30.

[0054] As in this embodiment, the housing 10 is provided with a partition plate 24 that divides the internal space S into an air blower chamber S1 in which the blower 7 is housed and a machine chamber S2 in which the compressor 2 is housed, and the electrical box 30 is positioned above the partition plate 24, with at least a portion of the heat sink 42 being located in the air blower chamber S1. As a result, in the outdoor unit 1, the control board 40 can be cooled via the heat sink 42 by the air flowing into the air blower chamber S1.

[0055] (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. Furthermore, it is also possible to combine the components described in the first embodiment above to create new embodiments. Therefore, other embodiments will be exemplified below.

[0056] FIG. 7 is a cross-sectional perspective view of the electrical box 30 according to the modified example, taken along the plane V shown in FIG. In the present embodiment, the electrical box 30 is provided with the sheet metal covers 44, 46. However, the present invention is not limited to this. As shown in Fig. 7, the electrical box 30 may have a portion of the board storage section 34 made of a metal material by integrally forming a plate-shaped metal member 80 on the bottom surface of the board storage section 34 by injection molding or the like. This improves the fire resistance of the electrical box 30.

[0057] Further, for example, in the electrical box 30, either or both of the board storage section 34 and the wire storage section 36 may be formed from a metal material. Alternatively, only the fan-side section 34A may be formed from a metal material.

[0058] FIG. 8 is an exploded perspective view of an electrical box 30 according to a modified example. In the embodiment described above, a plurality of through holes 37 and a plurality of sealing members 49 are provided, each of which is circular in plan view. However, the present invention is not limited to this, and each of the through holes 37 and the sealing members 49 may be formed in another shape, such as rectangular in plan view, and only one of the through holes 37 and the sealing members 49 may be provided. 8, the electrical box 30 may include a through hole 137 instead of the through hole 37, and may also include a sealing member 149 that closes the through hole 137. The through hole 137 and the sealing member 149 are formed into a rectangular shape in a plan view. A plurality of wirings 90 are provided integrally with the sealing member 149. The sealing member 149 may be fixed to the electrical box body 32 by a frame-shaped pressing member 150 .

[0059] In the above-described embodiment, the sealing member 49 is formed integrally with the wiring 90 by injection molding. However, this is not limiting, and the sealing member 49 may be formed integrally with the wiring 90 by other methods. For example, the sealing member 49 may be formed integrally with the wiring 90 by providing a through hole, inserting the wiring 90 into the through hole, and then covering the sealing member 49 with a heat-shrinkable tube or the like.

[0060] In the embodiment described above, the cable gland 52 is provided as a wiring lead-in portion that leads the wiring 94 into the wiring storage portion 36. However, the present invention is not limited to this, and the wiring storage portion 36 may be provided with a grommet, a PF pipe connector, a waterproof connector, or the like as a wiring lead-in portion.

[0061] In the above-described embodiment, the outdoor unit 1 is a heat source unit for an air conditioner. However, the outdoor unit 1 is not limited to this and can be applied to various devices equipped with a refrigerant circuit, such as chiller systems, water heaters, heat pump hot water heaters, and air conditioners. Furthermore, for example, the electrical box 30 may be used in an apparatus that uses a flammable refrigerant, such as an indoor unit of a refrigerator or an air conditioner.

[0062] It should be noted that the above-described embodiments are intended to illustrate the technology of the present disclosure, and various modifications, substitutions, additions, omissions, etc. may be made within the scope of the claims or their equivalents.

[0063] (Addendum) The above description of the embodiments discloses the following techniques.

[0064] (Technology 1) A heat source unit for a refrigeration cycle device that uses a flammable refrigerant, comprising a housing and an electrical box housed in the housing, wherein the electrical box forms a storage space that is separated from the internal space of the housing, electronic components are placed in the storage space, and the electrical box is provided with a first opening that connects the storage space to the outside of the housing. As a result, in the heat source unit, the electronic components that are heat-generating members are placed in a storage space that is isolated from the internal space of the housing, and an operator can access the inside of the electrical box from outside the housing through the first opening. Therefore, in the heat source unit, the electronic components that are heat-generating members can be isolated from the internal space of the housing, while wiring outside the housing can be easily connected to the electronic components.

[0065] (Technology 2) The heat source unit according to Technology 1, wherein the electrical box contains a wiring connection portion that connects at least a portion of the wiring connected to the electronic components to wiring outside the housing, and the wiring connection portion is exposed to the outside of the housing through the first opening. As a result, in the heat source unit, the electronic components that generate heat can be placed in the storage space R that is isolated from the internal space of the housing, and the wiring connection parts can be placed so that they can communicate with the outside of the housing. Therefore, in the heat source unit, the electronic components can be isolated from the internal space of the housing by the electrical box, while the wiring outside the housing can be easily connected to the electronic components.

[0066] (Technical Technique 3) The heat source unit according to Technical Technique 2, wherein a plurality of wires outside the housing are connected to the wire connection portion. As a result, the heat source unit can connect to multiple indoor units by providing multiple wiring connection sections in the electrical box, making it possible to form a system with multiple indoor units using the heat source unit.

[0067] (Technology 4) A heat source unit according to any one of Technology 1 to Technology 3, wherein the electrical box has a through hole that connects the storage space with the internal space, and at least a part of the wiring connected to the electronic component is passed through the through hole, and the through hole is sealed by a sealing member that is formed integrally with at least a part of the wiring connected to the electronic component. This allows the wiring to be routed from the inside to the outside of the electrical box while sealing the through-hole.

[0068] (Technical Aspect 5) The heat source unit according to Technical Aspect 4, wherein the sealing member is flexible and formed in a cylindrical shape. As a result, when the sealing member is fitted into the through hole, pressure is applied to the sealing member in a dispersed manner over the entire circumferential surface, thereby improving the degree of sealing of the electrical box.

[0069] (Technology 6) A heat source unit described in any one of Technology 1 to Technology 5, wherein the electrical box is provided with a wiring retraction section that retracts wiring outside the housing into the storage space, and the wiring retraction section is provided with a sealing member that retracts wiring outside the housing into the storage space while the electrical box is sealed. This allows the electrical box to supply external power to the electronic components inside while ensuring airtightness.

[0070] (Technology 7) A heat source unit according to any one of Technology 1 to Technology 6, wherein the electrical box is provided with a component storage section in which the electronic components are stored, and a wiring storage section in which a wiring connection section is stored that connects at least a portion of the wiring connected to the electronic components to wiring outside the housing, the wiring storage section is provided with the first opening and a wiring lead-in section that leads the wiring outside the housing into the storage space, and the first opening and the wiring lead-in section are exposed to the outside of the housing. This allows the heat source unit to easily connect wiring outside the housing to the electronic components while isolating the electronic components from the internal space of the housing with the electrical box.

[0071] (Technology 8) A heat source unit according to any one of Technology 1 to Technology 7, wherein the electrical box has a second opening that connects the inside and outside of the electrical box at a position that overlaps at least a portion of the electronic component, and each of the first opening and the second opening is covered by a cover made of a metal material. This allows for improved heat dissipation in the electrical box.

[0072] (Technical Aspect 9) The heat source unit according to Technical Aspect 8, wherein the lid that covers the first opening is covered by a cover member that is provided on the housing. This allows the heat source unit to protect the first opening and the lid that covers the first opening with the cover member.

[0073] (Technology 10) The heat source unit according to any one of Technologies 1 to 9, wherein at least a part of the electrical box is made of a metal material. This improves the fire resistance of the electrical box.

[0074] (Technology 11) A heat source unit according to any one of Technology 1 to Technology 10, wherein the housing is provided with a partition plate that separates the internal space into an air blower chamber in which a blower is housed and a machine chamber in which a compressor is housed, and the electrical box is arranged above the partition plate, with at least a portion of the electrical box being located in the air blower chamber. This allows the heat source unit to cool the electronic components with the air flowing into the ventilation chamber. [Industrial Applicability]

[0075] The present disclosure is applicable to a heat source unit of a refrigeration cycle device including a refrigeration circuit using a flammable refrigerant, specifically to an outdoor unit of an air conditioner, a humidity control device, a heat pump device, or the like. [Explanation of symbols]

[0076] 1 Outdoor unit (heat source unit) 2 Compressor 6 Service valve 8 Outdoor heat exchanger 9. Blower 10. Cabinet 12 Bottom Panel 14 Top panel 16 Front Panel 17 Rear Panel 19 Exhaust port 18, 20 Side panels 21 Side opening 22 Cover member 24 Partition 26 Protective materials 30 Electrical box 31 Opening (second opening) 32 Electrical box body 33, 54 Lid 34 Circuit board storage section 34A Blower side part 34B Machine room side part 35 Heat dissipation opening 36 Wiring storage section 37 Through hole 38, 56 Packing 39 Opening (first opening) 40 Control board (electronic components) 42 Heat sink 43 Fixed part 44, 46 Sheet metal cover 45, 47 Cover opening 48 Sealing material 49, 149 Sealing member 50 Terminal block (wiring connection part) 51 Wiring entry hole (wiring entry section) 52 Cable gland (sealing material) 80 Metallic parts 90, 92, 94 wiring 91 Conductor 93 Insulating coating material 95 Insertion hole 137 Through Hole 150 holding member P communication path R Storage space R1 board space R2 Wiring space S interior space S1 ventilation room S2 Machine room

Claims

1. A heat source unit of a refrigeration cycle device using a flammable refrigerant, The housing and an electrical box housed in the housing; Equipped with the electrical equipment box forms a storage space separated from the internal space of the housing, Electronic components are placed in the storage space, The electrical box is provided with a first opening that connects the storage space to the outside of the housing. Heat source unit.

2. The electrical box accommodates a wiring connection portion at which at least a portion of wiring connected to the electronic component is connected to wiring outside the housing, The wiring connection portion is exposed to the outside of the housing through the first opening. The heat source unit according to claim 1 .

3. A plurality of wires outside the housing are connected to the wire connection portion. The heat source unit according to claim 2 .

4. The electrical box is provided with a through hole that connects the storage space and the internal space, At least a part of a wiring connected to the electronic component is passed through the through hole, The through hole is sealed with a sealing member formed integrally with at least a part of the wiring connected to the electronic component. The heat source unit according to any one of claims 1 to 3.

5. The sealing member is flexible and formed in a cylindrical shape. The heat source unit according to claim 4.

6. The electrical box is provided with a wiring lead-in portion that leads wiring outside the housing into the storage space, The wiring lead-in portion is provided with a seal member that leads the wiring outside the housing into the storage space while the electrical box is sealed. The heat source unit according to any one of claims 1 to 5.

7. The electrical box includes: a component storage section in which the electronic components are stored; a wire connection storage section for storing a wire connection section for connecting at least a part of the wire connected to the electronic component to a wire outside the housing; is established, The wire connection storage section includes: the first opening; a wiring lead-in portion that leads wiring outside the housing into the storage space; is established, The first opening and the wiring lead-in portion are exposed to the outside of the housing. The heat source unit according to any one of claims 1 to 6.

8. a second opening portion that communicates the inside and the outside of the electrical box is provided in the electrical box at a position that overlaps at least a part of the electronic component; the first opening; the second opening; Each of the above is covered with a lid made of a metal material. The heat source unit according to any one of claims 1 to 7.

9. The lid that covers the first opening is covered by a cover member that is provided on the housing. The heat source unit according to claim 8.

10. At least a portion of the electrical box is made of a metal material. The heat source unit according to any one of claims 1 to 8.

11. The housing defines the internal space as: a blower chamber in which a blower is housed; a machine room in which the compressor is housed; A partition board is provided to separate the The electrical box is disposed above the partition plate, and at least a portion of the electrical box is located in the air blowing chamber. The heat source unit according to any one of claims 1 to 10.

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