Compressor

Abstract

To provide a sealing structure of a compressor terminal which can secure airtightness of the interior of a terminal cover member which protects a sealing terminal of a compressor.SOLUTION: A compressor includes: a compressor main part which compresses a combustible refrigerant; a sealing terminal which is provided at the compressor main part and connected with a wiring for making electric connection with the outside; a seal member provided on the outer surface side of the compressor main part; a terminal cover which is attached so as to cover the sealing terminal through the seal member; and fixing means which fix the terminal cover to the compressor main part. The fixing means are provided at positions which are substantially symmetrical, with the sealing terminal located at the center.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a compressor having a sealing structure and a terminal cover used in the sealing structure. [Background technology]

[0002] Patent Document 1 discloses a compressor for a refrigeration cycle device that is provided in a sealed container and in which sealed terminals that are electrically connected to devices inside the sealed container are covered and protected.

[0003] This compressor comprises a terminal cover that covers the sealed terminal and has a wiring opening for passing lead wires connected to the sealed terminal, a fixing part that fixes the terminal cover to the sealed container, a sealing member that is sandwiched between the terminal cover and the sealed container to obstruct the flow of gas, and a metal bushing that is placed in the wiring opening of the terminal cover to protect the lead wires and has a mesh of 30 mesh or more, and the inside and outside of the terminal cover are connected by a gap of 0.9 millimeters or less.

[0004] Furthermore, Patent Document 2 discloses a compressor in which the work of connecting wires to sealed terminals can be easily performed and the cover of the sealed terminal can be easily assembled.

[0005] This compressor comprises a sealed container, a compression mechanism housed in the sealed container, an electric motor that drives the compression mechanism, a sealed terminal provided in the sealed container, wiring connected to the sealed terminal outside the sealed container, a first cover that surrounds the sealed terminal on the outer surface of the sealed container and holds the wiring, a second cover that is attached to cover the first cover and forms a sealed internal cover space together with the first cover, and fixing means for attaching the first cover and the second cover to the sealed container, wherein the abutment surfaces of the first cover and the second cover are inclined with respect to the attachment surface of the sealed terminal. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2021-032129 [Patent Document 2] Japanese Patent Publication No. 2023-176502 Summary of the Invention [Problem to be solved by the invention]

[0007] The present disclosure provides a compressor that compresses a flammable refrigerant and that can prevent foreign matter such as gas or liquid from entering a terminal cover. [Means for solving the problem]

[0008] The compressor of the present disclosure is a compressor comprising a compressor main body that compresses a flammable refrigerant, a sealed terminal provided on the compressor main body to which wiring that electrically connects to the outside is connected, a sealing member provided on the outer surface side of the compressor main body, a terminal cover that is attached so as to cover the sealed terminal via the sealing member, and a fixing means that fixes the terminal cover to the compressor main body, and the fixing means are provided in positions that are approximately symmetrical with respect to the sealed terminal. [Effects of the Invention]

[0009] The compressor of the present disclosure has a sealed structure in which a sealed terminal provided in a sealed container is covered with a terminal cover, and can prevent foreign matter such as gas or liquid from entering the terminal cover. [Brief explanation of the drawings]

[0010] [Figure 1] Schematic diagram of a refrigeration cycle device according to an embodiment of the present disclosure. [Figure 2] Perspective view of the top of the compressor during assembly [Figure 3] Plan view of the compressor when assembled [Figure 4] Exploded perspective view of the upper part of the compressor [Figure 5] (a) AA cross section in Figure 3, and (b) and (c) exploded views of the sealed terminal [Figure 6]Cross section B-B in Figure 3 [Figure 7] Plan view of a compressor with a flat seal member placed on it [Figure 8] A plan view of the compressor from FIG. 7, excluding the seal member. [Figure 9] 8 is a perspective view of the compressor shown in FIG. 7 with the seal member removed. [Figure 10] Grommet reference diagram DETAILED DESCRIPTION OF THE INVENTION

[0011] (Findings that formed the basis of this disclosure) At the time the inventors arrived at the idea of ​​this disclosure, several methods had been disclosed for explosion prevention of compressors installed in outdoor units of refrigeration cycle devices that use flammable refrigerants, including sealing the inside of the terminal cover by sandwiching a flat sealing member between the flat portion of the outer surface of the sealed container that fixes the sealed terminals of the compressor and the terminal cover, and providing a separate means for sealing the wiring in the terminal cover to ensure airtightness. This prevents the flammable refrigerant from coming into contact with the sealed terminals inside the terminal cover, thereby enhancing safety in the refrigeration cycle device, even if the flammable refrigerant leaks from the refrigerant piping, etc.

[0012] However, in the conventional configuration, the bolt for fixing the terminal cover to the sealed container is located away from the center of the sealed terminal, and when the nut is tightened, the sealing surface of the terminal cover, which is located far from the center of the terminal, becomes loose, creating a gap between the flat sealing member, compromising airtightness and posing a risk of gas or liquid circulating.The inventors discovered this problem, and in order to solve this problem, they came up with the subject matter of the present disclosure.

[0013] Therefore, the present disclosure provides a compressor that has a sealed structure in which a sealed terminal provided in a sealed container is covered with a terminal cover, and that can prevent foreign matter such as gas or liquid from entering the terminal cover.

[0014] Hereinafter, embodiments will be described in detail with reference to the drawings. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters or redundant descriptions of substantially the same configurations may be omitted.

[0015] 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.

[0016] (Embodiment 1) Hereinafter, the first embodiment will be described with reference to the drawings.

[0017] [1-1.Configuration] [1-1-1. Configuration of refrigeration cycle device] Fig. 1 is a diagram showing a schematic configuration of a refrigeration cycle device 1 according to embodiment 1. In Fig. 1, for convenience of explanation, the flow of refrigerant is indicated by arrows of solid or dashed lines.

[0018] The refrigeration cycle device 1 of this embodiment is an air conditioner, and the solid line indicates the flow of refrigerant during cooling, and the dashed line indicates the flow of refrigerant during heating.

[0019] As shown in FIG. 1, the refrigeration cycle device 1 includes an indoor unit 10 disposed indoors and an outdoor unit 20 disposed outdoors.

[0020] The indoor unit 10 includes an indoor unit housing 11, an indoor heat exchanger 12 disposed in the indoor unit housing 11 and exchanging heat with indoor air, and a cross-flow fan 13 that generates a flow of indoor air so that the indoor air passes through the indoor heat exchanger 12.

[0021] The outdoor unit 20 also includes an outdoor unit housing 21, a compressor 22 arranged inside the outdoor unit housing 21 and compressing the refrigerant, a four-way valve 26 that switches the flow direction of the refrigerant, an outdoor heat exchanger 23 that exchanges heat with outdoor air, an axial flow fan 24 that generates a flow of outdoor air so that the outdoor air passes through the outdoor heat exchanger 23, and an expansion valve 25 that decompresses the refrigerant.

[0022] The compressor 22, the four-way valve 26, the outdoor heat exchanger 23, the expansion valve 25, and the indoor heat exchanger 12 are connected in a ring shape via refrigerant piping 30, thereby forming a refrigeration cycle. [1-1-2. Compressor assembly configuration] Fig. 2 is a perspective view showing the upper part of compressor 22 according to embodiment 1 when assembled. Fig. 3 is a plan view of the upper part of compressor 22 when assembled, and Fig. 4 is an exploded perspective view of the upper part of compressor 22 when assembled. Fig. 5 is a cross-sectional view from fixed part to fixed part (taken along line AA in Fig. 3) when the compressor is assembled. Fig. 6 is a cross-sectional view in the wiring direction (taken along line BB in Fig. 3) when the compressor is assembled. Fig. 7 is a plan view of the compressor with sealing member 45 set therein. [1-1-3. Compressor configuration] Fig. 8 is a plan view of the compressor according to embodiment 1. Fig. 8 differs from Fig. 7 in that it shows a state in which seal member 45 has been removed. FIG. 9 is a perspective view showing the upper part of the compressor 22. As shown in FIG.

[0023] 2 to 9 according to the first embodiment is a rotary compressor, and a housing 40 of the compressor 22 is a sealed container, and a pump mechanism (not shown) having a compression chamber for compressing a refrigerant and a motor (not shown) for driving a rotor rotating in the compression chamber are housed inside a cylindrical main body 42. An upper mirror plate 43 that closes the upper surface of the main body 42 and a lower mirror plate (not shown) that closes the lower surface are also provided.

[0024] The upper mirror plate 43 has a flat portion and a curved portion to ensure strength and improve welding workability and assembly, and the flat portion is provided with a refrigerant discharge pipe 51 through which the refrigerant is discharged, a fixing member 47, and a sealed terminal 44 that is electrically connected to the motor.

[0025] The refrigerant discharge pipe 51 is spatially connected to the compression chamber and is brazed to the upper mirror plate 43. As shown in (b) of Figure 5, the sealed terminal 44 has a cylindrical metal body portion 44a, a terminal rod 44b connected to a terminal plate 44c outside the sealed container and a terminal plate B inside the container, and a plated electrode terminal is sealed and fixed to the body portion 44a with an insulating glass member 44e.A portion 44d of the electrode terminal located inside the housing 40 is electrically connected to a motor (not shown) mounted inside the housing 40.

[0026] The fixing members 47 are stud bolts, and are fixed by welding or the like at positions symmetrical with respect to the sealed terminal 44 on the flat surface of the upper mirror plate 43 .

[0027] In this embodiment, a planar sealing member 45 is provided which has a hole 53 formed to avoid the outer periphery of the cylindrical portion 44h where the sealed terminal 44 provided on the flat portion of the upper mirror plate 43 is exposed to the outside of the housing 40, and the outer periphery of the cylindrical portion on the underside of the stud bolt 47.

[0028] Cables 49a and 49c are connected to a terminal plate 44c of the electrode terminal on the outside of the sealed container via connection terminals 52a and 52c.

[0029] After passing the cables 49a to 49c through the cable outlet holes in the terminal cover 46, the terminal cover 46 is placed on top of the sealing member 45 so as to cover the sealed terminal 44 from above, and is fastened to the bolt 47 with a nut 48, thereby sealing the space between the upper mirror plate 43 of the compressor 22 and the terminal cover 46.

[0030] Next, the main body 50b of the cable gland 50 fitted with the sealing member 50a is attached to the terminal cover 46, the cables 49a to 49c are passed through the sealing member 50c and attached to the main body 50b, and then the nut 50d for the cable gland 50 is attached, thereby sealing the spaces between the terminal cover 46, the cable gland 50, and the cables 49a to 49c.

[0031] These cables 49a, 49c are electrically connected to a control board (not shown) provided inside the outdoor unit 20 by a cable gland 50 while ensuring airtightness with the terminal cover 46.

[0032] [1-2. Operation] The operation of the refrigeration cycle device 1 configured as above will be described below.

[0033] In this embodiment, a flammable refrigerant is used as the refrigerant flowing through the refrigerant circuit. The flammable refrigerant is, for example, R32 or a mixed refrigerant containing 70 weight percent or more of R32, or propane or a mixed refrigerant containing propane.

[0034] When the refrigeration cycle device 1 starts to operate, the compressor 22 is driven to compress the refrigerant, and the axial flow fan 24 and the cross flow fan 13 are rotated.

[0035] During cooling operation, the refrigerant flows as shown by the solid arrows in Fig. 1. First, the refrigerant is compressed by the compressor 22 into a high-temperature, high-pressure gas, passes through the four-way valve 26, and is then sent to the outdoor heat exchanger 23. The axial flow fan 24 generates a flow of outdoor air so that the outdoor air passes through the outdoor heat exchanger 23, where it exchanges heat with the outdoor air and is cooled and condensed. The condensed refrigerant is then reduced in pressure by the expansion valve 25, and then evaporates in the indoor heat exchanger 12 by exchanging heat with the indoor air, removing heat from the indoor air, becoming a gas refrigerant and returning to the compressor 22.

[0036] Next, during heating operation, by switching the four-way valve 26, the refrigerant flows as shown by the dashed arrows in Fig. 1. First, the refrigerant is compressed in the compressor 22 to become a high-temperature, high-pressure gas, passes through the four-way valve 26, and is then sent to the indoor heat exchanger 12. The refrigerant is cooled and condensed by heat exchange with the indoor air using the crossflow fan 13, which generates a flow of indoor air so that the indoor air passes through the indoor heat exchanger 12. The condensed refrigerant is decompressed by the expansion valve 25, and then evaporates by heat exchange with the outdoor air in the outdoor heat exchanger 23, becoming a gas refrigerant that is returned to the compressor 22 again.

[0037] (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.

[0038] Therefore, other embodiments will be exemplified below.

[0039] In the above-described first embodiment, the cables 49a, 49c are secured to the terminal cover 46 in an airtight manner by the cable gland 50, but this is not limiting and, for example, a dustproof and waterproof grommet 60 may be used as shown in FIG.

[0040] 10, (a) is a plan view of a grommet 60 according to another embodiment, (b) is a side view, (c) is a perspective view, and (d) is a perspective cross-sectional view.

[0041] The terminal cover 46 needs to be modified to match the configuration of the grommet, but this will not be explained here.

[0042] Furthermore, in the first embodiment, the case of an air conditioner has been described as an example, but the present invention can also be applied to a refrigeration cycle device that uses a flammable refrigerant, such as a heat pump type water heater. (Addendum) (Technology 1) A compressor for compressing a flammable refrigerant, a sealed terminal provided on the compressor, wiring connected to the sealed terminal, a seal member provided on the outer surface side of the compressor, a terminal cover attached to cover the sealed terminal via the seal member, and a fixing means for fixing the terminal cover to the compressor, A compressor characterized in that fixing portions for fixing the terminal cover are located symmetrically with respect to the center of the sealed terminal on the outer surface side of the compressor.

[0043] This configuration improves the adhesion of the terminal cover edge to the seal member when fastening the fixing means and prevents partial lifting of the terminal cover, thereby improving the airtightness of the exposed portion of the compressor's sealed terminal. As a result, in a refrigeration cycle device using this configuration, refrigerant can be prevented from entering the compressor.

[0044] (Technology 2) The compressor according to Technology 1, wherein the sealing member is flat and the sealed terminal is provided on the top surface of the compressor.

[0045] This configuration makes it easier to seal between the seal member and the terminal cover, and makes it easier to improve the airtightness of the portion of the compressor's sealed terminal that is exposed to the outside of the housing. As a result, it is possible to prevent refrigerant from entering the compressor using this configuration. (Technical Technique 3) The compressor according to Technical Technique 1 or 2, wherein at least a portion of the top surface of the compressor where the sealing member is disposed is formed as a flat surface.

[0046] This configuration makes it easier to seal between the flat surface to which the sealed terminal of the compressor is fixed and the seal member, making it easier to improve the airtightness of the exposed portion of the sealed terminal of the compressor outside the housing. In addition, by combining this configuration with (Technology 2), it is possible to further prevent refrigerant from entering the compressor using this configuration. (Technology 4) The compressor according to Technology 1, wherein the fixing means comprises a bolt having one end welded to the compressor and a threaded portion at the other end, and a nut attached to the threaded portion.

[0047] This configuration allows the terminal cover to be fixed with bolts and nuts at symmetrical positions on either side of the sealed terminal, which makes it easier to apply a uniform load to the terminal cover and prevents partial lifting or deformation of the terminal cover, thereby improving the airtightness of the exposed portion of the compressor's sealed terminal outside the housing, and therefore preventing refrigerant from entering the compressor using this configuration.

[0048] (Technology 5) The seal structure of the compressor described in Technology 1, wherein the seal member is located on a flat surface on the top surface of the compressor and has a flat surface configured to surround at least the cylindrical portion of the sealed terminal and a hole through which the bolt passes, and the cover member is configured to seal the flat surface.

[0049] This configuration makes it easier to attach the seal member to the compressor and to seal the terminal cover, improving the airtightness of the exposed portion of the compressor's sealed terminal, thereby preventing refrigerant from entering the compressor using this configuration. (Technology 6) The seal structure of the compressor according to Technology 1, wherein the terminal cover can hold the wiring connected to the sealed terminal in a sealed state.

[0050] This configuration allows the seal between the terminal cover and the wiring to be removed, improving the airtightness of the exposed portion of the sealed terminal of the compressor. In addition, the synergistic effect with Techniques 1 to 5 further improves the airtightness.

[0051] Therefore, it is possible to prevent the refrigerant from entering the compressor using this configuration. [Industrial Applicability]

[0052] The present disclosure is suitably applicable to a compressor having a sealed structure, a refrigeration cycle device having a compressor, and a terminal cover used in the sealed structure. [Explanation of symbols]

[0053] 1 Refrigeration cycle device 10 Indoor unit 11 Indoor unit housing 12 Indoor heat exchanger 13 Crossflow fan 20 Outdoor unit 21 Outdoor unit housing 22 Compressor 23 Outdoor heat exchanger 24 Axial fan 25 Expansion valve 26 Four-way valve 30 Refrigerant piping 40 Compressor housing 42 Compressor body 43 Upper mirror plate 44 Sealed terminal 44a Body 44b Terminal rod 44c Terminal board outside the sealed container 44d Terminal board inside the sealed container 44e Insulating glass section 45 Sealing material 46 Terminal cover 47 Fixing member 48 Nut 49a~49c cable 50 Cable Gland 50a Cable gland seal material 50b Cable Gland Main Body 50c Cable gland seal 50d Cable Gland Nut 51 Refrigerant discharge pipe 52a~52c connection terminals 53 Hole 60 Grommets

Claims

1. A compressor comprising: a compressor main body that compresses a flammable refrigerant; a sealed terminal provided on the compressor main body to which wiring for electrical connection to the outside is connected; a sealing member provided on the outer surface of the compressor main body; a terminal cover attached so as to cover the sealed terminal via the sealing member; and fixing means for fixing the terminal cover to the compressor main body, wherein the fixing means are provided in positions approximately symmetrical with respect to the sealed terminal.

2. 2. The compressor according to claim 1, wherein the sealing member is substantially flat, and the sealed terminal is provided on a top surface of the compressor.

3. The compressor according to claim 1 or 2, wherein a top surface of the compressor has a substantially flat surface portion at a portion where the seal member is disposed.

4. 2. The compressor according to claim 1, wherein said fixing means comprises a bolt having one end welded to said compressor and a threaded portion at the other end, and a nut attached to said threaded portion.

5. 2. The compressor according to claim 1, wherein the sealing member is installed on a flat surface of the compressor and has a flat surface configured to surround at least the cylindrical portion of the sealed terminal and a hole portion through which the bolt passes, and the terminal cover is configured to cover and seal the flat surface together with the sealing member.

6. The compressor according to claim 1 , wherein the terminal cover is capable of holding the wiring in a sealed state.

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