Electric compressor and method for attaching sound insulation cover in electric compressor

Abstract

To provide an electric compressor in which the reaching of water a housing can be suppressed and furthermore degradation of noise reduction effect caused by a noise insulation cover can be suppressed.SOLUTION: An electric compressor 10 comprises a compression unit 30, an electric motor 40, a housing 20 and a noise insulation cover 60. The noise insulation cover 60 is constituted of a plurality of layers including a first layer 70 laminated on the housing 20, and a second layer 80 laminated on the first layer 70. The first layer 70 is constituted of a first split body 71 and a second split body 72. The second layer 80 is constituted of a first split body 81 and a second split body 82. The first split bodies 71, 81 are arranged above boundary portions 73, 83. The second split bodies 72, 82 are arranged below the boundary portions 73, 83. The boundary portion 73 of the first layer 70 as a second selection layer 92 is located upward of the boundary portion 83 of the second layer 80 as a first selection layer 91.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an electric compressor and a method for attaching a soundproof cover to the electric compressor.

Background Art

[0002] An electric compressor includes a compression unit, an electric motor, and a housing. The compression unit compresses a fluid. The electric motor drives the compression unit. The housing houses the compression unit and the electric motor.

[0003] Here, for the purpose of reducing the noise of the electric compressor, for example, it is conceivable to cover the housing with a soundproof shell described in Patent Document 1. The soundproof shell has an upper segment and a lower segment. The upper segment covers the upper side of the housing. The lower segment covers the lower side of the housing.

[0004] The upper segment and the lower segment have a sound absorption layer and a sound insulation layer. The sound absorption layer is overlaid on the housing. The sound insulation layer is overlaid on the sound absorption layer. The upper segment and the lower segment cover the housing by butting against each other. The soundproof shell is composed of a plurality of layers such as the sound absorption layer and the sound insulation layer.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Incidentally, when the boundary between the sound-absorbing layer of the upper segment and the sound-absorbing layer of the lower segment and the boundary between the sound-insulating layer of the upper segment and the sound-insulating layer of the lower segment are in the same position in the vertical direction, there is a risk that water may enter the housing through each boundary from the outside of the soundproof shell. Also, although the soundproof shell reduces the noise of the electric compressor, there is a risk that the noise reduction effect may decrease because all the boundaries are in the same position in the vertical direction.

Means for Solving the Problems

[0007] The electric compressor that solves the above problems includes a compression part that compresses a fluid, an electric motor that drives the compression part, a housing that houses the compression part and the electric motor, and a soundproof cover that covers the housing. The soundproof cover is composed of a plurality of layers including a first layer that is overlapped on the housing and a second layer that is overlapped on the first layer. Each of the layers is composed of a first divided body and a second divided body. The first divided body is disposed above the boundary between the first divided body and the second divided body, and the second divided body is disposed below the boundary. The electric compressor is such that when one of the layers is taken as a first selected layer and the layer located inside the first selected layer is taken as a second selected layer, the boundary of the second selected layer is located above the boundary of the first selected layer.

[0008] According to the above configuration, among the boundaries of the layers constituting the soundproof cover, there are boundaries whose positions are shifted in the vertical direction. That is, the boundaries of all the layers do not extend linearly from the housing to the outside of the soundproof cover. For this reason, the noise generated from the compression part or the electric motor is less likely to leak to the outside of the soundproof cover. Therefore, it is difficult to reduce the noise reduction effect of the electric compressor.

[0009] Also, the boundary portion of the second selection layer is located above the boundary portion of the first selection layer. Therefore, even if water has penetrated from the boundary portion of the outermost layer, which is the outermost layer among all the layers, to the boundary portion of the first selection layer, it is difficult for the water to reach the boundary portion of the second selection layer. Thus, even if water enters from the outside of the electric compressor, it is difficult for the water to reach the housing. Therefore, while suppressing the water from reaching the housing, it is possible to suppress a decrease in the noise reduction effect due to the sound insulation cover.

[0010] In the above-described electric compressor, the boundary portion of the outermost layer, which is the outermost layer among the layers, may be located at the lowest position among the boundary portions of the layers. According to the above configuration, it is difficult for the water that has penetrated from the boundary portion of the outermost layer to pass through the boundary portions of the layers existing inside the outermost layer. Therefore, it becomes more difficult for the water to reach the housing.

[0011] In a method for attaching a sound insulation cover in an electric compressor that solves the above problems, a compression unit that compresses a fluid, an electric motor that drives the compression unit, a housing that houses the compression unit and the electric motor, and a sound insulation cover that covers the housing are provided. The sound insulation cover is composed of a plurality of layers including a first layer that is overlaid on the housing and a second layer that is overlaid on the first layer. Each of the layers is composed of a first divided body and a second divided body. The first divided body is disposed above the boundary portion between the first divided body and the second divided body, and the second divided body is disposed below the boundary portion. When one of the layers is defined as a first selection layer and the layer located inside the first selection layer is defined as a second selection layer, the boundary portion of the second selection layer is located above the boundary portion of the first selection layer. A method for attaching a sound insulation cover in an electric compressor, including: a first step of forming a first precursor by overlapping the first divided bodies of the layers; a second step of forming a second precursor by overlapping the second divided bodies of the layers; and a third step of assembling the first precursor and the second precursor to cover the housing with the first precursor and the second precursor.

[0012] According to the above attachment method, the first divided bodies of each layer are overlapped in advance to form a first precursor. Then, the second divided bodies of each layer are overlapped in advance to form a second precursor. Thereby, the process of finally attaching the sound insulation cover to the housing of the electric compressor can be simplified.

[0013] In the electric compressor to which the sound insulation cover is attached by the above attachment method, among the boundary portions of the layers constituting the sound insulation cover, there are boundary portions whose positions are shifted in the vertical direction. That is, not all the boundary portions of the layers extend linearly from the housing to the outside of the sound insulation cover. For this reason, noise generated from the compression part and the electric motor is less likely to leak to the outside of the sound insulation cover. Therefore, it is difficult to reduce the noise reduction effect of the electric compressor.

[0014] Also, the boundary portion of the second selected layer is located above the boundary portion of the first selected layer. For this reason, even if water enters from the outermost layer boundary portion, which is the outermost layer among all the layers, to the boundary portion of the first selected layer, it is difficult to reach the boundary portion of the second selected layer. Therefore, even if water enters from the outside of the electric compressor, it is difficult to reach the housing. Therefore, while suppressing water from reaching the housing, it is possible to suppress a decrease in the noise reduction effect by the sound insulation cover.

Advantages of the Invention

[0015] According to this invention, while suppressing water from reaching the housing, it is possible to suppress a decrease in the noise reduction effect by the sound insulation cover.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0017] [First Embodiment] Hereinafter, a first embodiment in which an electric compressor is embodied will be described with reference to FIGS. 1 to 3. The electric compressor of the present embodiment is used, for example, in a vehicle air conditioner.

[0018] <Electric Compressor> As shown in FIG. 1, the electric compressor 10 includes a housing 20, a compression section 30, an electric motor 40, an inverter 50, and a soundproof cover 60. The housing 20 has a cylindrical shape. The housing 20 is made of metal. The housing 20 is made of, for example, aluminum. The direction in which the axis m of the housing 20 extends is defined as the axial direction A. The direction in which a circle drawn around the axis m of the housing 20 extends is defined as the circumferential direction B. Note that the housing 20 is composed of a plurality of housing components that can be divided in the axial direction A.

[0019] The compression section 30 compresses a refrigerant as a fluid. The electric motor 40 drives the compression section 30. The inverter 50 drives the electric motor 40. The housing 20 houses the compression section 30, the electric motor 40, and the inverter 50. The compression section 30, the electric motor 40, and the inverter 50 are arranged in this order in the axial direction A of the housing 20.

[0020] The electric motor 40 is driven by power supplied from the inverter 50. The compression section 30 is of a scroll type composed of a fixed scroll and a movable scroll (not shown). The compression section 30 compresses the refrigerant sucked into the housing 20 as the electric motor 40 is driven.

[0021] <Soundproof Cover> As shown in FIGS. 1 and 2, the soundproof cover 60 covers the housing 20. The soundproof cover 60 is composed of a plurality of layers. In this embodiment, there are two layers that constitute the soundproof cover 60. Each of the plurality of layers is referred to as a first layer 70 and a second layer 80. The first layer 70 is laid on the housing 20. The second layer 80 is laid on the first layer 70. The second layer 80 covers the first layer 70. In this embodiment, the first layer 70 is formed of, for example, a urethane material, a non-woven fabric, or the like. The first layer 70 is formed of a material with excellent sound absorption properties. In this embodiment, the second layer 80 is formed of polypropylene, polyamide, ABS resin, an olefin-based elastomer, or the like. In this embodiment, the second layer 80 is formed of a material with excellent sound insulation properties.

[0022] The first layer 70 is provided along the outer shape of the housing 20. The first layer 70 has a first divided body 71 and a second divided body 72. The first divided body 71 has a first accommodation recess 71a. The first accommodation recess 71a opens toward the second divided body 72. The second divided body 72 has a second accommodation recess 72a. The second accommodation recess 72a opens toward the first divided body 71. The first accommodation recess 71a and the second accommodation recess 72a have a shape along the outer shape of the housing 20.

[0023] The first divided body 71 has a first opening end face 71b. The first opening end face 71b is an annular plane surrounding the opening toward the second divided body 72 in the first accommodation recess 71a. The first opening end face 71b is a plane extending in the horizontal direction. The second divided body 72 has a second opening end face 72b. The second opening end face 72b is an annular plane surrounding the opening toward the first divided body 71 in the second accommodation recess 72a. The second opening end face 72b is a plane extending in the horizontal direction.

[0024] The first opening end face 71b and the second opening end face 72b are in contact with each other over the entire circumference thereof. The portion where the first opening end face 71b and the second opening end face 72b are in contact is the boundary portion 73 between the first divided body 71 and the second divided body 72 in the first layer 70. The first divided body 71 is disposed above the housing 20 with reference to the boundary portion 73. The second divided body 72 is disposed below the housing 20 with reference to the boundary portion 73. Here, above the housing 20 means the upper side in the vertical direction Vd of the housing 20. Below the housing 20 means the lower side in the vertical direction Vd of the housing 20.

[0025] The second layer 80 is provided along the outer shape of the first layer 70. The second layer 80 has a first divided body 81 and a second divided body 82. The first divided body 81 has a first housing recess 81a. The first housing recess 81a opens toward the second divided body 82. The second divided body 82 has a second housing recess 82a. The second housing recess 82a opens toward the first divided body 81. The first housing recess 81a and the second housing recess 82a have a shape along the outer shape of the first layer 70.

[0026] The first divided body 81 has a first opening end face 81b. The first opening end face 81b is an annular plane surrounding the opening toward the second divided body 82 in the first housing recess 81a. The first opening end face 81b is a plane extending in the horizontal direction. The second divided body 82 has a second opening end face 82b. The second opening end face 82b is an annular plane surrounding the opening toward the first divided body 81 in the second housing recess 82a. The second opening end face 82b is a plane extending in the horizontal direction.

[0027] The first opening end face 81b and the second opening end face 82b are in contact with each other over the entire circumference thereof. The portion where the first opening end face 81b and the second opening end face 82b are in contact is the boundary portion 83 between the first divided body 81 and the second divided body 82 in the second layer 80. The first divided body 81 is disposed above the housing 20 with reference to the boundary portion 83. The second divided body 82 is disposed below the housing 20 with reference to the boundary portion 83.

[0028] The direction in which the first divided bodies 71, 81 and the second divided bodies 72, 82 are assembled is defined as the vertical direction D. In the present embodiment, the vertical direction D coincides with the vertical direction Vd. Note that, for example, the vertical direction D may be a direction slightly inclined with respect to the vertical direction Vd. The vertical direction D may be inclined with respect to the vertical direction Vd to such an extent that the first divided bodies 71, 81 can be positioned at least above the second divided bodies 72, 82 in the vertical direction Vd.

[0029] As shown in FIG. 2, the length of the first divided body 71 of the first layer 70 in the circumferential direction B is shorter than the length of the second divided body 72 of the first layer 70 in the circumferential direction B. That is, when comparing the first divided body 71 and the second divided body 72, the size of the first divided body 71 is smaller than the size of the second divided body 72. Therefore, the boundary portion 73 between the first divided body 71 and the second divided body 72 is located upward in the vertical direction D from the axis m of the housing 20 due to the difference in the sizes of the first divided body 71 and the second divided body 72.

[0030] The length of the first divided body 81 of the second layer 80 in the circumferential direction B is the same as the length of the second divided body 82 of the second layer 80 in the circumferential direction B. That is, when comparing the first divided body 81 and the second divided body 82, the size of the first divided body 81 is the same as the size of the second divided body 82. Therefore, the boundary portion 83 between the first divided body 81 and the second divided body 82 is arranged at the same position as the axis m of the housing 20 in the vertical direction D.

[0031] <The first selection layer, the second selection layer, the outermost layer> As shown in FIGS. 1 and 2, the second layer 80 as one of the layers 70, 80 constituting the soundproof cover 60 is defined as the first selection layer 91, and the first layer 70 as the layer located inside the first selection layer 91 is defined as the second selection layer 92. Then, the boundary portion 73 of the second selection layer 92 is located upward in the vertical direction D from the boundary portion 83 of the first selection layer 91. The boundary portion 83 of the second layer 80, which is the outermost layer among the layers 70, 80, is located lowest among the boundary portions 73, 83 of the layers 70, 80 in the vertical direction D.

[0032] <Method for Attaching Soundproof Cover in Electric Compressor> As shown in FIGS. 2 and 3, the method for attaching the soundproof cover 60 in the electric compressor 10 includes a first step P1, a second step P2, and a third step P3.

[0033] As shown in FIG. 2, the first step P1 is a step of overlapping the first divided body 71 of the first layer 70 and the first divided body 81 of the second layer 80. By overlapping the first divided body 71 of the first layer 70 and the first divided body 81 of the second layer 80, a first precursor 101 is formed. That is, the first step P1 is a step of forming the first precursor 101 by overlapping the first divided bodies 71 and 81 of the layers 70 and 80.

[0034] The first divided body 71 of the first layer 70 is accommodated in the first accommodation recess 81a of the first divided body 81 of the second layer 80. The entire first divided body 71 of the first layer 70 is accommodated inside the first divided body 81 of the second layer 80. The entire outer surface of the first divided body 71 of the first layer 70 is in contact with the inner surface of the first accommodation recess 81a of the first divided body 81 of the second layer 80. In the first precursor 101, the first opening end surface 71b of the first divided body 71 of the first layer 70 is parallel to the first opening end surface 81b of the first divided body 81 of the second layer 80.

[0035] The second step P2 is a step of overlapping the second divided body 72 of the first layer 70 and the second divided body 82 of the second layer 80. By overlapping the first divided body 71 of the first layer 70 and the second divided body 82 of the second layer 80, a second precursor 102 is formed. That is, the second step P2 is a step of forming the second precursor 102 by overlapping the second divided bodies 72 and 82 of the layers 70 and 80.

[0036] The second divided body 82 of the first layer 70 is accommodated in the second accommodation recess 82a of the second divided body 82 of the second layer 80. A part of the second divided body 72 of the first layer 70 protrudes from the opening of the second divided body 82 of the second layer 80. The second opening end face 72b of the second divided body 72 of the first layer 70 protrudes outside the second divided body 82 of the second layer 80. A part of the outer surface of the second divided body 72 of the first layer 70 is in contact with the entire inner surface of the second accommodation recess 82a of the second divided body 82 of the second layer 80. In the second precursor 102, the second opening end face 72b of the second divided body 72 of the first layer 70 is parallel to the second opening end face 82b of the second divided body 82 of the second layer 80.

[0037] As shown in FIGS. 2 and 3, after the first step P1 and the second step P2 are completed, the third step P3 is executed. In the third step P3, first, the first precursor 101 is disposed above the housing 20, and the second precursor 102 is disposed below the housing 20.

[0038] The third step P3 is a step of bringing the first precursor 101 and the second precursor 102 closer to each other and assembling the first precursor 101 and the second precursor 102. The first opening end face 71b of the first precursor 101 contacts the second opening end face 72b of the second precursor 102, and the first opening end face 81b of the first precursor 101 contacts the second opening end face 82b of the second precursor 102. Then, as shown in FIG. 3, the housing 20 is covered by the first precursor 101 and the second precursor 102. That is, the third step P3 is a step of assembling the first precursor 101 and the second precursor 102 and covering the housing 20 with the first precursor 101 and the second precursor 102.

[0039] [Operation of the present embodiment] The operation of the present embodiment will be described. In the present embodiment, when the compression unit 30 and the electric motor 40 are driven, noise is generated through the housing 20. However, since the housing 20 is covered by the soundproof cover 60, the noise of the electric compressor 10 is reduced.

[0040] The boundary portions 73 and 83 of the layers 70 and 80 that constitute the soundproof cover 60 are displaced in the vertical direction D. That is, the boundary portions 73 and 83 of all the layers 70 and 80 do not extend linearly from the housing 20 to the outside of the soundproof cover 60. For this reason, noise generated from the compression unit 30 and the electric motor 40 is less likely to leak to the outside of the soundproof cover 60. Therefore, it is difficult to reduce the noise reduction effect of the electric compressor 10.

[0041] Also, the boundary portion 73 of the second selection layer 92 is located above the boundary portion 83 of the first selection layer 91. For this reason, even if water has entered up to the boundary portion 83 of the second layer 80, which is the outermost layer located on the outermost side among all the layers 70 and 80 and is the first selection layer 91, it is difficult to reach the boundary portion 73 of the second selection layer 92. Therefore, even if water enters from the outside of the electric compressor 10, it is difficult to reach the housing 20.

[0042] [Effects of the Present Embodiment] The effects of the present embodiment will be described. (1 - 1) The boundary portions 73 and 83 of the layers 70 and 80 that constitute the soundproof cover 60 are displaced in the vertical direction D. Also, the boundary portion 73 of the second selection layer 92 is located above the boundary portion 83 of the first selection layer 91. Therefore, it is possible to suppress a decrease in the noise reduction effect by the soundproof cover 60 while suppressing water from reaching the housing 20.

[0043] (1 - 2) The boundary portion 83 of the second layer 80, which is the outermost layer located on the outermost side among all the layers 70 and 80, is located at the lowest position among the boundary portions 73 and 83 of all the layers 70 and 80. For this reason, water that has entered from the boundary portion 83 of the second layer 80 is less likely to pass through the boundary portion 73 of the first layer 70 existing inside the second layer 80. Therefore, it becomes more difficult for water to reach the housing 20.

[0044] (1-3) According to the method of attaching the sound insulation cover 60 to the electric compressor 10 of the present embodiment, the first divided bodies 71 and 81 of each layer 70 and 80 are overlapped in advance to form the first precursor 101. Then, the second divided bodies 72 and 82 of each layer 70 and 80 are overlapped in advance to form the second precursor 102. Thereby, it is possible to simplify the process of finally attaching the sound insulation cover 60 to the housing 20 of the electric compressor 10.

[0045] [Second Embodiment] Hereinafter, a second embodiment in which the electric compressor is embodied will be described with reference to FIG. 4. The main difference between the present embodiment and the first embodiment is that a layer constituting the sound insulation cover 60 is added. This point will be described in detail, and the same components as those in the first embodiment will be denoted by the same reference numerals, and detailed description thereof will be omitted.

[0046] <Sound Insulation Cover> As shown in FIG. 4, the sound insulation cover 60 has a third layer 110. The third layer 110 is overlapped with the second layer 80. The third layer 110 covers the second layer 80. The third layer 110 is provided along the outer shape of the second layer 80. The sound insulation cover 60 is composed of a plurality of layers 70, 80, 110 including at least the first layer 70 and the second layer 80.

[0047] In the present embodiment, the third layer 110 is formed of a closed-cell rubber sheet, a semi-open-cell rubber sheet, or the like. It is formed of a material having excellent vibration isolation properties. The third layer 110 has a first divided body 111 and a second divided body 112. The first divided body 111 has a first accommodation recess 111a. The first accommodation recess 111a opens toward the second divided body 112. The second divided body 112 has a second accommodation recess 112a. The second accommodation recess 112a opens toward the first divided body 111. The first accommodation recess 111a and the second accommodation recess 112a have a shape along the outer shape of the second layer 80.

[0048] The first divided body 111 has a first opening end face 111b. The first opening end face 111b is an annular plane surrounding the opening in the first accommodation recess 111a toward the second divided body 112. The first opening end face 111b is a plane extending in the horizontal direction. The second divided body 112 has a second opening end face 112b. The second opening end face 112b is an annular plane surrounding the opening in the second accommodation recess 112a toward the first divided body 111. The second opening end face 112b is a plane extending in the horizontal direction.

[0049] The first opening end face 111b and the second opening end face 112b are in contact with each other over their entire circumferences. The portion where the first opening end face 111b and the second opening end face 112b are in contact is the boundary portion 113 between the first divided body 111 and the second divided body 112 in the third layer 110. The first divided body 111 is disposed above the housing 20 with reference to the boundary portion 113. The second divided body 112 is disposed below the housing 20 with reference to the boundary portion 113.

[0050] The length of the first divided body 111 of the third layer 110 in the circumferential direction B is greater than the length of the second divided body 112 of the third layer 110 in the circumferential direction B. That is, when comparing the first divided body 111 and the second divided body 112, the size of the first divided body 111 is larger than the size of the second divided body 112. Therefore, the boundary portion 113 between the first divided body 111 and the second divided body 112 is located downward in the vertical direction D from the axis m of the housing 20 due to the difference in the sizes of the first divided body 111 and the second divided body 112.

[0051] <The first selection layer, the second selection layer, the outermost layer> The third layer 110 as one of the layers 70, 80, 110 constituting the soundproof cover 60 is taken as the first selection layer 91, and the first layer 70 as the layer located inside the first selection layer 91 is taken as the second selection layer 92. Then, the boundary portion 73 of the second selection layer 92 is located upward in the vertical direction D from the boundary portion 113 of the first selection layer 91.

[0052] The third layer 110, which is one of the layers 70, 80, and 110 that make up the soundproof cover 60, is designated as the first selection layer 91, and the second layer 80, which is located inside the first selection layer 91, is designated as the second selection layer 92. Then, the boundary portion 83 of the second selection layer 92 is located above the boundary portion 113 of the first selection layer 91 in the vertical direction D.

[0053] The boundary portion 113 of the third layer 110, which is the outermost layer among the layers 70, 80, and 110, is located at the lowest position among the boundary portions 73, 83, and 113 of the layers 70, 80, and 110 in the vertical direction D.

[0054] <Method for Attaching Soundproof Cover in Electric Compressor> In the method for attaching the soundproof cover 60 in an electric compressor, in the first step P1, a step of overlapping the first divided body 111 of the third layer 110 with respect to the first divided body 81 of the second layer 80 is added. By overlapping the first divided body 71 of the first layer 70, the first divided body 81 of the second layer 80, and the first divided body 111 of the third layer 110, a first precursor 101 is formed. That is, the first step P1 is a step of forming the first precursor 101 by overlapping the first divided bodies 71, 81, and 111 of the layers 70, 80, and 110.

[0055] In the second step P2, a step of overlapping the second divided body 112 of the third layer 110 with respect to the second divided body 82 of the second layer 80 is added. By overlapping the second divided body 72 of the first layer 70, the second divided body 82 of the second layer 80, and the second divided body 112 of the third layer 110, a second precursor 102 is formed. That is, the second step P2 is a step of forming the second precursor 102 by overlapping the second divided bodies 72, 82, and 112 of the layers 70, 80, and 110.

[0056] In the third step P3, in addition to the first embodiment, the first opening end face 111b of the first precursor 101 contacts the second opening end face 112b of the second precursor 102. That is, the third step P3 is a step of assembling the first precursor 101 and the second precursor 102, and is a step of covering the housing 20 with the first precursor 101 and the second precursor 102.

[0057] [Operation of this embodiment] The operation of this embodiment will be described. The boundary portions 73, 83, 113 of the layers 70, 80, 110 constituting the soundproof cover 60 are displaced in the vertical direction D. That is, the boundary portions 73, 83, 113 of all the layers 70, 80, 110 do not extend linearly from the housing 20 to the outside of the soundproof cover 60. Therefore, the noise generated from the compression portion 30 and the electric motor 40 is less likely to leak to the outside of the soundproof cover 60. Thus, the noise reduction effect of the electric compressor 10 is less likely to be reduced.

[0058] Also, when the second layer 80 is the second selection layer 92, the boundary portion 83 is located above the boundary portion 113 when the third layer 110 is the first selection layer 91. When the first layer 70 is the second selection layer 92, the boundary portion 73 is located above the boundary portion 113 when the third layer 110 is the first selection layer 91.

[0059] Therefore, even if water enters up to the boundary portion 113 of the third layer 110 which is the first selection layer 91, it is difficult for water to reach the boundary portions 73, 83 of the layers 70, 80 that can be the second selection layer 92. Thus, even if water enters from the outside of the electric compressor 10, it is difficult for the water to reach the housing 20.

[0060] [Effect of this embodiment] The effect of this embodiment will be described. (2-1) The boundary portions 73, 83, 113 of the layers 70, 80, 110 that constitute the soundproof cover 60 are displaced in the vertical direction D. Also, the boundary portions 73, 83 of the layers 70, 80 that can become the second selection layer 92 are located upward of the boundary portion 113 of the third layer 110 that is the first selection layer 91. Therefore, it is possible to suppress a decrease in the noise reduction effect by the soundproof cover 60 while suppressing water from reaching the housing 20.

[0061] (2-2) The boundary portion 113 of the third layer 110, which is the outermost layer located most outside among the layers 70, 80, 110, is located lowest among the boundary portions 73, 83, 113 of the layers 70, 80, 110. For this reason, water that has entered from the boundary portion 113 of the third layer 110 hardly passes through the boundary portions 73, 83 of the layers 70, 80 existing inside the third layer 110. Therefore, it becomes more difficult for water to reach the housing 20.

[0062] [Modified Example] Note that each of the above embodiments can be implemented with the following modifications. Each of the above embodiments and the following modified examples can be implemented in combination with each other within a technically consistent range.

[0063] ○ In the second embodiment, the position of the boundary portion 113 of the third layer 110 may be changed as follows. As shown in FIG. 5, the boundary portion 113 of the third layer 110 may be disposed between the boundary portion 73 of the first layer 70 and the boundary portion 83 of the second layer 80 in the vertical direction D. When changing in this way, the second layer 80 may be the first selection layer 91 and the first layer 70 may be the second selection layer 92, or the third layer 110 may be the first selection layer 91 and the first layer 70 may be the second selection layer 92.

[0064] As shown in FIG. 6, the boundary portion 113 of the third layer 110 may be at the same position as the boundary portion 83 of the second layer 80 in the vertical direction D. When changing in this way, the second layer 80 may be the first selection layer 91 and the first layer 70 may be the second selection layer 92, or the third layer 110 may be the first selection layer 91 and the first layer 70 may be the second selection layer 92.

[0065] As shown in FIG. 7, the boundary portion 73 of the first layer 70 may be disposed at the same position as the boundary portion 113 of the third layer 110 in the vertical direction D, and the boundary portion 83 of the second layer 80 may be located above the boundary portions 73 and 113 of the respective layers 70 and 110. When changing in this way, the third layer 110 is used as the first selection layer 91, and the second layer 80 is used as the second selection layer 92.

[0066] In the modification example shown in FIG. 7, the boundary portion 113 of the third layer 110 may be located below the boundary portion 73 of the first layer 70. When changing in this way, the third layer 110 may be used as the first selection layer 91 and the second layer 80 may be used as the second selection layer 92, or the third layer 110 may be used as the first selection layer 91 and the first layer 70 may be used as the second selection layer 92.

[0067] In the modification example shown in FIG. 7, the boundary portion 73 of the first layer 70 may be located below the boundary portion 113 of the third layer 110. When changing in this way, the third layer 110 is used as the first selection layer 91, and the second layer 80 is used as the second selection layer 92.

[0068] In the modification example shown in FIG. 7, the boundary portion 83 of the second layer 80 may be located below the boundary portions 73 and 113 of the respective layers 70 and 110. When changing in this way, the second layer 80 is used as the first selection layer 91, and the first layer 70 is used as the second selection layer 92. In the second embodiment and the above modification example, it is preferable to change so that the sizes of the first divided body and the second divided body included in at least one of all the layers 70, 80, and 110 are different.

[0069] ○ In the first embodiment, the boundary portion 73 of the first layer 70 may be shifted downward from the axis m of the housing 20. When changing in this way, the boundary portion 83 of the second layer 80 is shifted downward from the boundary portion 73 of the first layer 70. That is, when the second layer 80 is used as the first selection layer 91 and the first layer 70 is used as the second selection layer 92, it is sufficient that the boundary portion 73 of the second selection layer 92 is located above the boundary portion 83 of the first selection layer 91.

[0070] ○ In each of the above embodiments and the above modification examples, although the first opening end faces 71b, 81b, 111b and the second opening end faces 72b, 82b, 112b are planes extending in the horizontal direction, it is not limited thereto. For example, the first opening end faces 71b, 81b, 111b and the second opening end faces 72b, 82b, 112b may have surfaces extending so as to form a step in the vertical direction D. The shapes of the first opening end faces 71b, 81b, 111b and the second opening end faces 72b, 82b, 112b may be appropriately changed. Even if changed in this way, it is only necessary that the whole of the boundary portion of the second selection layer 92 is located upward of the whole of the boundary portion of the first selection layer 91.

[0071] ○ In each of the above embodiments, the first divided body 71 and the second divided body 72 may be connected by, for example, a hinge or the like. The first divided body 81 and the second divided body 82 may be connected by, for example, a hinge or the like. The first divided body 111 and the second divided body 112 may be connected by, for example, a hinge or the like.

[0072] ○ In each of the above embodiments, the number of layers constituting the soundproof cover 60 may be four or more. Even in the case of such a change, it is configured such that the boundary portion of the second selection layer 92 is located upward of the boundary portion of the first selection layer 91.

[0073] ○ In each of the above embodiments, the housing 20 may have a portion protruding in the radial direction, which is a direction orthogonal to the axis m of the housing 20. And the part protruding radially from the housing 20 may be changed to be covered by the soundproof cover 60. In the case of such a change, the sizes of the first divided body and the second divided body in either the first selection layer 91 or the second selection layer 92 are made different so that the boundary portion of the second selection layer 92 is located upward of the boundary portion of the first selection layer 91.

[0074] ○ In each of the above embodiments, the first layer 70 may be formed of a material having excellent sound insulation properties. The second layer 80 may be formed of a material having excellent sound absorption properties. Further, the third layer 110 may be formed of a material having excellent sound absorption or sound insulation properties, and the first layer 70 or the second layer 80 may be formed of a material having excellent vibration damping properties. The properties such as sound absorption, sound insulation, or vibration damping of the plurality of layers constituting the soundproof cover 60 may be appropriately changed in each layer. The soundproof cover 60 may be formed of any material as long as it has a soundproof function. Note that the properties of the plurality of layers constituting the soundproof cover 60 may be properties other than sound absorption, sound insulation, and vibration damping.

[0075] ○ In each of the above embodiments, the compression part 30 is not limited to the scroll type, and may be, for example, a piston type, a vane type, or the like. ○ In each of the above embodiments, the electric compressor 10 may be mounted on a fuel cell vehicle and compress air as a fluid supplied to the fuel cell by the compression part 30.

Description of Reference Numerals

[0076] 10... Electric compressor, 20... Housing, 30... Compression part, 40... Electric motor, 60... Soundproof cover, 70... First layer, 71... First divided body of the first layer, 72... Second divided body of the first layer, 73... Boundary part of the first layer, 80... Second layer, 81... First divided body of the second layer, 82... Second divided body of the second layer, 83... Boundary part of the second layer, 91... First selection layer, 92... Second selection layer, 101... First precursor, 102... Second precursor, 110... Third layer, 111... First divided body of the third layer, 112... Second divided body of the third layer, 113... Boundary part of the third layer, P1... First step, P2... Second step, P3... Third step.

Claims

1. a compression unit that compresses a fluid; an electric motor that drives the compression unit; a housing that houses the compression unit and the electric motor; a soundproof cover that covers the housing, and comprising: the soundproof cover is composed of a plurality of layers including a first layer that is overlaid on the housing and a second layer that is overlaid on the first layer; the outer surface of the first layer and the inner surface of the second layer are in contact; each of the layers is composed of a first divided body and a second divided body; the first divided body is disposed above the boundary between the first divided body and the second divided body; the second divided body is disposed below the boundary, and is an electric compressor; when one of the layers is defined as a first selected layer and the layer located inside the first selected layer is defined as a second selected layer, the boundary of the second selected layer is located above the boundary of the first selected layer. An electric compressor characterized by this.

2. The electric compressor according to claim 1, wherein the boundary of the outermost layer located outermost among the layers is located lowest among the boundaries of the layers.

3. A method for attaching a soundproof cover in an electric compressor, the electric compressor comprising a compression unit that compresses a fluid, an electric motor that drives the compression unit, a housing that houses the compression unit and the electric motor, and a soundproof cover that covers the housing, the soundproof cover being composed of a plurality of layers including a first layer that is overlaid on the housing and a second layer that is overlaid on the first layer, the outer surface of the first layer and the inner surface of the second layer being in contact, each of the layers being composed of a first divided body and a second divided body, the first divided body being disposed above the boundary between the first divided body and the second divided body, the second divided body being disposed below the boundary, and when one of the layers is defined as a first selected layer and the layer located inside the first selected layer is defined as a second selected layer, the boundary of the second selected layer is located above the boundary of the first selected layer, the method comprising: a first step of forming a first precursor by overlapping the first divided bodies of the layers; a second step of forming a second precursor by overlapping the second divided bodies of the layers; A method for attaching a sound insulation cover in an electric compressor, the method including a step of assembling the first precursor and the second precursor, and a third step of covering the housing with the first precursor and the second precursor.

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