Inverter device

Abstract

To accurately manage a position of an electronic component with respect to a holder.SOLUTION: A recess 60 which is filled with an adhesive 61 is formed on a mounting surface 44. Therefore, when fixing an electronic component 31 to a holder 40 via the adhesive 61, the adhesive 61 being present between the mounting surface 44 and an opposed surface 34 flows into the recess 60. The electronic component 31 is then fixed to the holder 40 via the adhesive 61 that fills the inside of the recess 60. At such a time, a positioning surface 59 is in contact with the opposed surface 34 to position the electronic component 31 with respect to the holder 40. Thus, the adhesive 61 is not interposed between the mounting surface 44 and the opposed surface 34. Accordingly, the problem that, for example, the adhesive is interposed between the mounting surface 44 and the opposed surface 34 and it is difficult to accurately manage the position of the electronic component 31 with respect to the holder 40 due to a thickness of the adhesive interposed between the mounting surface 44 and the opposed surface 34 is avoided.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an inverter device. [Background technology]

[0002] Conventionally, an inverter device including an electronic component, a circuit board, and a holder has been known. The circuit board is connected to the electronic component via a conductor. The holder holds the electronic component and is interposed between the electronic component and the circuit board. The holder has a mounting surface on which the electronic component is placed. The electronic component has an opposing surface that faces the mounting surface. The electronic component is placed on the holder by arranging the opposing surface facing the mounting surface. The electronic component is fixed to the holder via an adhesive interposed between the mounting surface and the opposing surface, such as the base and capacitor of Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-983 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when an electronic component is fixed to a holder via an adhesive interposed between the mounting surface and the opposing surface, it is difficult to estimate the thickness of the adhesive interposed between the mounting surface and the opposing surface, which makes it difficult to accurately manage the position of the electronic component relative to the holder. [Means for solving the problem]

[0005] An inverter device that solves the above problem comprises an electronic component, a circuit board connected to the electronic component via a conductor, and a holder that holds the electronic component and is interposed between the electronic component and the circuit board, wherein the holder has a mounting surface on which the electronic component is placed, the electronic component has an opposing surface that faces the mounting surface, and the opposing surface is arranged opposite the mounting surface, so that the electronic component is placed on the holder, and the mounting surface has a positioning surface that comes into contact with the opposing surface to position the electronic component relative to the holder, and a recess into which adhesive is filled, and the electronic component is fixed to the holder via the adhesive.

[0006] According to this, when an electronic component is fixed to a holder via adhesive, the adhesive present between the mounting surface and the opposing surface flows into the recess. The electronic component is then fixed to the holder via the adhesive filling the recess. At this time, the positioning surface contacts the opposing surface to position the electronic component relative to the holder. Therefore, no adhesive is interposed between the mounting surface and the opposing surface. This avoids a problem where, for example, adhesive is interposed between the mounting surface and the opposing surface, making it difficult to accurately control the position of the electronic component relative to the holder due to the thickness of the adhesive interposed between the mounting surface and the opposing surface. As a result, the position of the electronic component relative to the holder can be accurately controlled.

[0007] In the inverter device, the recess may be open and not closed by the opposing surface. This means that the recess is open and not blocked by the opposing surface, so even if the adhesive filled into the recess overflows from the recess, it is easy to prevent the adhesive overflowing from the recess from flowing between the mounting surface and the opposing surface.

[0008] In the inverter device, the opposing surface may be a flat surface, and the placement surface may be a flat surface extending along the opposing surface. Even with this configuration, the position of the electronic component relative to the holder can be managed with high precision. [Effects of the Invention]

[0009] According to this invention, the position of the electronic component relative to the holder can be managed with high precision. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view of an electric compressor according to an embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the inverter device. [Figure 3] FIG. 3 is a cross-sectional view for explaining the inverter device. [Figure 4] FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of an inverter device will be described below with reference to Figures 1 to 4. The inverter device of this embodiment is mounted on an electric compressor, which is used in, for example, a vehicle air conditioner.

[0012] <Outline of electric compressor> As shown in FIG. 1, the electric compressor 10 includes a housing 11. The housing 11 includes a discharge housing 12 and a motor housing 13. The discharge housing 12 and the motor housing 13 are cylindrical. The motor housing 13 is connected to the discharge housing 12. The discharge housing 12 and the motor housing 13 are made of a metal material. The discharge housing 12 and the motor housing 13 are made of aluminum, for example. The motor housing 13 includes a plate-shaped end wall 13a and a cylindrical peripheral wall 13b. The peripheral wall 13b extends from the outer periphery of the end wall 13a.

[0013] The electric compressor 10 includes a rotating shaft 14. The rotating shaft 14 is accommodated in a motor housing 13. Therefore, the rotating shaft 14 is accommodated in the housing 11. The rotating shaft 14 is rotatably supported by the motor housing 13.

[0014] The electric compressor 10 includes a compression unit 15 and a motor 16. The compression unit 15 and the motor 16 are housed in a motor housing 13. Therefore, the housing 11 houses the compression unit 15 and the motor 16. The compression unit 15 and the motor 16 are arranged side by side in the axial direction of the rotary shaft 14, which is the direction in which the rotation axis of the rotary shaft 14 extends. The motor 16 is arranged closer to the end wall 13a of the motor housing 13 than the compression unit 15.

[0015] The compression section 15 is driven by the rotation of the rotary shaft 14. The compression section 15 compresses a refrigerant fluid. The compression section 15 is, for example, a scroll type having a fixed scroll (not shown) fixed to the motor housing 13 inside the motor housing 13 and an orbiting scroll (not shown) disposed opposite the fixed scroll.

[0016] The motor 16 has a cylindrical stator 17 and a cylindrical rotor 18. The rotor 18 is disposed inside the stator 17. The rotor 18 is configured to be rotatable integrally with the rotating shaft 14. The rotor 18 has a rotor core 18a and a plurality of permanent magnets 18b. The rotor core 18a is fixed to the rotating shaft 14. The plurality of permanent magnets 18b are provided on the rotor core 18a. The stator 17 surrounds the rotor 18. The stator 17 has a cylindrical stator core 17a and a motor coil 19. The motor coil 19 is wound around the stator core 17a. When power is supplied to the motor coil 19, the rotor 18 rotates, and the rotating shaft 14 rotates integrally with the rotor 18. The compression unit 15 is driven in conjunction with the rotation of the rotating shaft 14. In this manner, the motor 16 drives the compression unit 15.

[0017] The housing 11 has a suction port 13h. The suction port 13h is formed in a portion of the peripheral wall 13b of the motor housing 13, closer to the end wall 13a. The suction port 13h draws refrigerant into the motor housing 13. A first end of the external refrigerant circuit 20 is connected to the suction port 13h. The housing 11 has a discharge port 12h. The discharge port 12h is formed in the discharge housing 12. A second end of the external refrigerant circuit 20 is connected to the discharge port 12h.

[0018] The refrigerant drawn into the motor housing 13 from a first end of the external refrigerant circuit 20 via the suction port 13h is compressed in the compression section 15 as the compression section 15 is driven. The refrigerant compressed in the compression section 15 flows out to a second end of the external refrigerant circuit 20 via the discharge port 12h. The refrigerant that has flowed out to the external refrigerant circuit 20 passes through a heat exchanger and an expansion valve of the external refrigerant circuit 20 and returns to the motor housing 13 via the suction port 13h. The electric compressor 10 and the external refrigerant circuit 20 constitute a vehicle air conditioning system 21.

[0019] The electric compressor 10 has a cylindrical cover 22. The cover 22 is part of the housing 11. Therefore, the housing 11 has the cover 22. The cover 22 is connected to an end wall 13a of the motor housing 13. The housing 11 has an inverter chamber 23. The inverter chamber 23 is defined by the cover 22 and the end wall 13a of the motor housing 13.

[0020] The inverter device 24 is accommodated in the inverter chamber 23. Therefore, the inverter chamber 23 accommodates the inverter device 24. The inverter device 24 drives the motor 16. The compression section 15, the motor 16, and the inverter device 24 are arranged in this order in the axial direction of the rotating shaft 14.

[0021] <Inverter device overview> 2, the inverter device 24 includes an electronic component 31, a holder 40, and a circuit board 50. The holder 40 holds the electronic component 31. The circuit board 50 has two lead insertion holes 51. Each lead insertion hole 51 penetrates the circuit board 50 in the thickness direction of the circuit board 50.

[0022] <Holder> As shown in Figures 3 and 4, the holder 40 is made of resin. The holder 40 is interposed between the electronic component 31 and the circuit board 50. The holder 40 is plate-shaped. The holder 40 has a holder main body 41 and an attachment portion 42. The holder 40 has a plurality of attachment portions 42. The holder main body 41 has an accommodating recess 43. Therefore, the holder 40 has the accommodating recess 43.

[0023] 2, the accommodating recess 43 has a rectangular hole shape in a plan view. The accommodating recess 43 has a mounting surface 44 and a first side surface 45, a second side surface 46, a third side surface 47, and a fourth side surface 48. Therefore, the holder 40 has the mounting surface 44. The electronic component 31 is mounted on the mounting surface 44.

[0024] The mounting surface 44 has a rectangular shape in a plan view. The mounting surface 44 is flat. The first side surface 45, the second side surface 46, the third side surface 47, and the fourth side surface 48 each stand upright from the outer periphery of the mounting surface 44. The first side surface 45, the second side surface 46, the third side surface 47, and the fourth side surface 48 extend in a direction perpendicular to the mounting surface 44. The first side surface 45 and the second side surface 46 face each other. The first side surface 45 and the second side surface 46 extend parallel to each other. The third side surface 47 and the fourth side surface 48 face each other. The third side surface 47 and the fourth side surface 48 extend parallel to each other. The mounting surface 44 is surrounded by the first side surface 45, the second side surface 46, the third side surface 47, and the fourth side surface 48 in a plan view.

[0025] Three relief recesses 47a are formed on the third side surface 47. The three relief recesses 47a are arranged at regular intervals in the extension direction of the third side surface 47 when the accommodating recess 43 is viewed in a plane. Each relief recess 47a extends from the mounting surface 44 to the opening edge of the accommodating recess 43. Each relief recess 47a is continuous with the mounting surface 44. Three relief recesses 48a are formed on the fourth side surface 48. The three relief recesses 48a are arranged at regular intervals in the extension direction of the fourth side surface 48 when the accommodating recess 43 is viewed in a plane. Each relief recess 48a extends from the mounting surface 44 to the opening edge of the accommodating recess 43. Each relief recess 47a is continuous with the mounting surface 44. Each relief recess 48a is arranged at a position facing the corresponding relief recess 47a in the extension direction of the first side surface 45 and the second side surface 46 when the accommodating recess 43 is viewed in a plane.

[0026] The holder main body 41 has two lead insertion holes 49. Each lead insertion hole 49 penetrates the holder main body 41 in the thickness direction of the holder 40. Each mounting portion 42 is formed integrally with the holder main body 41. A bolt insertion hole 42a is formed in each mounting portion 42. The bolt insertion hole 42a penetrates the mounting portion 42 in the thickness direction of the holder 40.

[0027] <Electronic components> The electronic component 31 is, for example, a film capacitor. The electronic component 31 has a component body 32 and leads 33 as conductors. The electronic component 31 has two leads 33. The component body 32 has a rectangular parallelepiped shape. The component body 32 is housed in an accommodating recess 43. Therefore, the accommodating recess 43 houses the electronic component 31. The component body 32 has an opposing surface 34 that faces the mounting surface 44. Therefore, the electronic component 31 has an opposing surface 34 that faces the mounting surface 44. The opposing surface 34 has a quadrangular shape when viewed from above. The opposing surface 34 is flat.

[0028] The component main body 32 has a first side surface 35, a second side surface 36, a third side surface 37, and a fourth side surface 38. The first side surface 35, the second side surface 36, the third side surface 37, and the fourth side surface 38 each stand upright from the outer periphery of the opposing surface 34. The first side surface 35, the second side surface 36, the third side surface 37, and the fourth side surface 38 extend in a direction perpendicular to the opposing surface 34. The first side surface 35 and the second side surface 36 extend parallel to each other. The second side surface 36 is a surface of the component main body 32 located opposite the first side surface 35. The third side surface 37 and the fourth side surface 38 extend parallel to each other. The fourth side surface 38 is a surface of the component main body 32 located opposite the third side surface 37.

[0029] The component body 32 has a protruding surface 39. The protruding surface 39 is a surface of the component body 32 located on the opposite side to the opposing surface 34. The protruding surface 39 is rectangular in plan view. The protruding surface 39 is flat. The protruding surface 39 is continuous with the first side surface 35, the second side surface 36, the third side surface 37, and the fourth side surface 38. As shown in FIGS. 3 and 4 , the protruding surface 39 protrudes from the accommodating recess 43 when the component body 32 is accommodated in the accommodating recess 43.

[0030] As shown in FIG. 3 , the electronic component 31 is placed on the holder 40 with the opposing surface 34 facing the mounting surface 44. The electronic component 31 is placed on the holder 40 with the component body 32 accommodated in the accommodating recess 43 with the opposing surface 34 in contact with the mounting surface 44. The mounting surface 44 extends along the opposing surface 34. Thus, the mounting surface 44 is a flat surface extending along the opposing surface 34. The first side surface 35 of the component body 32 faces the first side surface 45 of the accommodating recess 43. The second side surface 36 of the component body 32 faces the second side surface 46 of the accommodating recess 43. As shown in FIG. 4 , the third side surface 37 of the component body 32 faces the third side surface 47 of the accommodating recess 43. The fourth side surface 38 of the component body 32 faces the fourth side surface 48 of the accommodating recess 43.

[0031] Each lead 33 protrudes from the fourth side surface 38. Each lead 33 extends from the fourth side surface 48 in a direction perpendicular to the fourth side surface 48, then bends toward the opposing surface 34 and extends parallel to the fourth side surface 48. Each lead 33 is inserted into a corresponding lead insertion hole 49 of the holder main body 41. The tip of each lead 33 that has passed through each lead insertion hole 49 is then inserted into a corresponding lead insertion hole 51 of the circuit board 50. The tip of each lead 33 is soldered to the circuit board 50 while inserted into each lead insertion hole 51. In this way, each lead 33 is electrically connected to the circuit board 50. The tip of each lead 33 protrudes from the circuit board 50 after passing through each lead insertion hole 51. In this manner, the circuit board 50 is connected to the electronic component 31 via the leads 33.

[0032] <Concave> 3 and 4, a positioning surface 59 and three recesses 60 are formed on the mounting surface 44. The positioning surface 59 is the surface excluding the areas where the recesses 60 are formed, and is the surface that comes into contact with the opposing surface 34. The positioning surface 59 comes into contact with the opposing surface 34 to position the electronic component 31 relative to the holder 40.

[0033] Each recess 60 is shaped like an elongated rectangular hole. The depth of each recess 60 relative to the positioning surface 59 is the same. As shown in FIG. 2 , when the storage recess 43 is viewed from above, each recess 60 is formed on the mounting surface 44 so that the longitudinal direction of each recess 60 coincides with the extension direction of the first side surface 45 and the second side surface 46. The recesses 60 extend parallel to each other. The longitudinal length of each recess 60 is the same. The longitudinal length of each recess 60 is longer than the distance between the third side surface 47 and the fourth side surface 48. The longitudinal length of each recess 60 is longer than the length from the third side surface 37 to the fourth side surface 38 of the component body 32.

[0034] 4, the electronic component 31 is arranged relative to the holder 40 so that the component body 32 is accommodated in the accommodation recess 43 with both ends of each recess 60 located on either side of the longitudinal direction of the recess 60 protruding from the opposing surface 34. One end of each recess 60 located on one side of the longitudinal direction of the recess 60 communicates with the corresponding relief recess 47a. The other end of each recess 60 located on the other side of the longitudinal direction of the recess 60 communicates with the corresponding relief recess 48a. In this way, each recess 60 is open and not blocked by the opposing surface 34.

[0035] 3, each recess 60 is filled with an adhesive 61 such as a potting material. The adhesive 61 filled in each recess 60 contacts the facing surface 34. The electronic component 31 is fixed to the holder 40 via the adhesive 61 with the facing surface 34 in contact with the mounting surface 44. In this way, the electronic component 31 is fixed to the holder 40 via the adhesive 61. The electronic component 31 is fixed to the holder 40 via the adhesive 61, and thereby the holder 40 holds the electronic component 31.

[0036] 4, part of the adhesive 61 flows out from one end of each recess 60 in the longitudinal direction to the inside of each relief recess 47a. Also, part of the adhesive 61 flows out from the other end of each recess 60 in the longitudinal direction to the inside of each relief recess 48a.

[0037] <Relationship between inverter device and housing> As shown in FIG. 3 , a plurality of bosses 62 protrude from the outer surface of the end wall 13a of the motor housing 13. A female threaded hole 62a is formed in the tip surface of each boss 62. The holder 40 is disposed against the end wall 13a of the motor housing 13, with each mounting portion 42 abutting against the tip surface of the corresponding boss 62. Bolts 63 pass through each bolt insertion hole 42a and are threaded into each female threaded hole 62a, thereby attaching the holder 40 to the end wall 13a of the motor housing 13. An adhesive 64 is interposed between the protruding surface 39 of the component body 32 and the end wall 13a of the motor housing 13. The electronic component 31 is fixed to the end wall 13a of the motor housing 13 via the adhesive 64.

[0038] [Operation of the embodiment] Next, the operation of this embodiment will be described. The electronic components 31 are fixed to the holder 40 via the adhesive 61. Therefore, for example, even if the inverter device 24 is transported when the inverter device 24 is attached to the end wall 13a of the motor housing 13, the electronic components 31 will not fall off from the holder 40. In this way, the adhesive 61 filled in each recess 60 is used to temporarily fix the electronic components 31 to the holder 40 so that the electronic components 31 will not fall off from the holder 40 when the inverter device 24 is transported.

[0039] When the inverter device 24 is attached to the end wall 13a of the motor housing 13, an adhesive 64 is interposed between the protruding surface 39 of the component body 32 and the end wall 13a of the motor housing 13. Therefore, the adhesive 64 positions the electronic component 31 relative to the holder 40 and the end wall 13a of the motor housing 13. In this way, the adhesive 64 interposed between the protruding surface 39 of the component body 32 and the end wall 13a of the motor housing 13 is used to finally fix the electronic component 31 to the holder 40 and the end wall 13a of the motor housing 13.

[0040] [Effects of the embodiment] The above embodiment can provide the following effects. (1) The mounting surface 44 is formed with a recess 60 into which adhesive 61 is filled. Accordingly, when the electronic component 31 is fixed to the holder 40 via the adhesive 61, the adhesive 61 present between the mounting surface 44 and the opposing surface 34 flows into the recess 60. The electronic component 31 is then fixed to the holder 40 via the adhesive 61 filled in the recess 60. At this time, the positioning surface 59 contacts the opposing surface 34 to position the electronic component 31 relative to the holder 40. Therefore, no adhesive 61 is interposed between the mounting surface 44 and the opposing surface 34. This avoids a problem that, for example, when adhesive is interposed between the mounting surface 44 and the opposing surface 34, the thickness of the adhesive makes it difficult to accurately control the position of the electronic component 31 relative to the holder 40. As a result, the position of the electronic component 31 relative to the holder 40 can be accurately controlled.

[0041] (2) The recess 60 is open and not blocked by the opposing surface 34. Therefore, even if the adhesive 61 filled in the recess 60 overflows from the recess 60, it is easy to prevent the adhesive 61 overflowing from the recess 60 from flowing between the mounting surface 44 and the opposing surface 34.

[0042] (3) The facing surface 34 is a flat surface, and the placement surface 44 is a flat surface extending along the facing surface 34. Even with this configuration, the position of the electronic component 31 relative to the holder 40 can be controlled with high precision.

[0043] (4) Since the position of the electronic component 31 relative to the holder 40 can be controlled with high precision, the amount of protrusion of the tip of the lead 33 that has passed through the lead insertion hole 51 relative to the circuit board 50 can be easily controlled.

[0044] [Example of change] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other within the scope of technical compatibility.

[0045] In the embodiment, the electronic component 31 may be, for example, a cylindrical electrolytic capacitor. In this case, the component body 32 is cylindrical. Therefore, the facing surface 34 of the electronic component 31 is an arcuate surface. The mounting surface 44 of the holder 40 is also an arcuate surface extending along the facing surface 34.

[0046] In the above-mentioned embodiment, the electronic component 31 may be, for example, a coil component that constitutes a filter. In other words, the electronic component 31 held by the holder 40 is not particularly limited.

[0047] In the embodiment, the shape of the recess 60 is not particularly limited. In the embodiment, the depth of each recess 60 relative to the mounting surface 44 may be different.

[0048] In the embodiment, the number of recesses 60 formed on the mounting surface 44 is not particularly limited. For example, when the mounting surface 44 has one recess 60, the recess 60 may be formed on the mounting surface 44 so as to extend in a serpentine manner. When the recess 60 extends in a serpentine manner, a portion of the recess 60 may be open and not blocked by the opposing surface 34. The key is that the recess 60 is open and not blocked by the opposing surface 34.

[0049] In the embodiment, the recess 60 may be completely closed by the facing surface 34. In this case, it is necessary to precisely control the amount of adhesive 61 filled in the recess 60 so that the adhesive 61 does not overflow from the recess 60 and flow between the mounting surface 44 and the facing surface 34.

[0050] In the above-described embodiment, the holder 40 may not have the accommodating recess 43. Even in such a case, the holder 40 may have the mounting surface 44.

[0051] In the embodiment, the shape of the holder 40 is not particularly limited as long as the holder 40 has a mounting surface 44 on which the electronic component 31 is mounted and is capable of holding the electronic component 31.

[0052] In the above-described embodiment, the type of adhesive 61 is not limited to a potting material. Any type of adhesive 61 may be used as long as it can fix the electronic component 31 to the holder 40.

[0053] In the embodiment, the electric compressor 10 may be configured such that, for example, the inverter device 24 is disposed radially outward of the rotary shaft 14 relative to the housing 11. In other words, the compression unit 15, the motor 16, and the inverter device 24 do not have to be disposed side by side in this order in the axial direction of the rotary shaft 14.

[0054] In the above-described embodiment, the compression unit 15 is not limited to a scroll type, and may be, for example, a piston type, a vane type, a rotary type, or the like. In the above embodiment, the electric compressor 10 constitutes the vehicle air-conditioning device 21. However, the present invention is not limited to this. For example, the electric compressor 10 may be mounted on a fuel cell vehicle and may compress air, which serves as a fluid to be supplied to the fuel cell, using the compression unit 15.

[0055] In the above embodiment, the inverter device 24 is mounted on the electric compressor 10. However, the present invention is not limited to this. In other words, the inverter device 24 may be mounted on any device. [Explanation of symbols]

[0056] 24... inverter device, 31... electronic component, 33... lead as a conductor, 34... opposing surface, 40... holder, 44... mounting surface, 50... circuit board, 59... positioning surface, 60... recess, 61... adhesive.

Claims

1. Electronic components and a circuit board connected to the electronic components via conductors; a holder that holds the electronic component and is interposed between the electronic component and the circuit board, the holder has a mounting surface on which the electronic component is placed, the electronic component has an opposing surface facing the placement surface, The opposing surface is disposed opposite to the mounting surface, and the electronic component is an inverter device mounted on the holder, The mounting surface is formed with a positioning surface that contacts the opposing surface to position the electronic component relative to the holder, and a recess that is filled with an adhesive, The inverter device is characterized in that the electronic component is fixed to the holder via the adhesive.

2. 2. The inverter device according to claim 1, wherein the recess is open and not closed by the opposing surface.

3. The opposing surface is flat, 3. The inverter device according to claim 1, wherein the mounting surface is a flat surface extending along the opposing surface.

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