CN116779336A - Electrolytic capacitor mounting structure - Google Patents

Electrolytic capacitor mounting structure Download PDF

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Publication number
CN116779336A
CN116779336A CN202310220075.XA CN202310220075A CN116779336A CN 116779336 A CN116779336 A CN 116779336A CN 202310220075 A CN202310220075 A CN 202310220075A CN 116779336 A CN116779336 A CN 116779336A
Authority
CN
China
Prior art keywords
recess
electrolytic capacitor
main body
conductive member
heat conductive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310220075.XA
Other languages
Chinese (zh)
Inventor
和藤勇太
宇佐美胜也
冈田仁
白石和洋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Industries Corp
Original Assignee
Toyota Industries Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Publication of CN116779336A publication Critical patent/CN116779336A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/121—Casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/02—Mountings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/02—Mountings
    • H01G2/04—Mountings specially adapted for mounting on a chassis
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/02—Mountings
    • H01G2/06—Mountings specially adapted for mounting on a printed-circuit support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/08—Cooling arrangements; Heating arrangements; Ventilating arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/14—Protection against electric or thermal overload
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/0003—Protection against electric or thermal overload; cooling arrangements; means for avoiding the formation of cathode films
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/08—Housing; Encapsulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/08—Housing; Encapsulation
    • H01G9/12—Vents or other means allowing expansion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/145—Liquid electrolytic capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/14—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors
    • H01G11/18—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors against thermal overloads, e.g. heating, cooling or ventilating

Abstract

An electrolytic capacitor mounting structure is provided with a main body part configured to house an electrode and an electrolyte, a terminal provided on the 1 st side surface of the main body part, and an explosion-proof valve provided on the 2 nd side surface of the main body part. The substrate is fixed on the metal shell. A heat conductive member is provided between the metal case and the electrolytic capacitor. A recess having a bottom is formed in the metal housing. The recess is configured to be inserted into a part of the body portion including the 2 nd side surface, and a gap of a predetermined interval is formed between the recess and the inserted body portion. The gap of the predetermined interval includes a portion where the interval between the recess and the 2 nd side surface is larger than the interval between the recess and the other surface of the main body portion. The heat conductive member is configured to fill the gap so as to cover the main body portion in the recess, and to allow deformation to restrict the flow of electrolyte from the recess when the explosion-proof valve is operated.

Description

Electrolytic capacitor mounting structure
Technical Field
The present disclosure relates to electrolytic capacitor mounting structures.
Background
In an electrolytic capacitor mounting structure, an electrolytic capacitor mounted on a substrate includes a main body, a terminal, and an explosion-proof valve. The main body part is cylindrical. The main body portion accommodates an electrode and an electrolyte. The terminal is provided on the 1 st side surface of the main body. The terminal is connected to the electrode in the body. The explosion-proof valve is arranged on the 2 nd side surface of the main body part. The 2 nd side surface is a surface of the main body portion opposite to the 1 st side surface. The explosion-proof valve operates when the pressure in the main body exceeds a predetermined pressure, and discharges the electrolyte to the outside of the main body.
Terminals of the electrolytic capacitor are connected to the substrate. The substrate is fixed on the metal housing. A heat conductive member is provided between the metal case and the electrolytic capacitor. The heat conductive member transfers heat generated in the electrolytic capacitor to the metal case. The heat conductive member is a member that mediates heat dissipation from the electrolytic capacitor to the metal case. The heat of the electrolytic capacitor is radiated from the metal case.
For example, in the steering device described in international publication No. 2018/088162, the electrolytic capacitor mounting structure described above is used. The electrolytic capacitor of the steering device includes an element as an electrode, a case as a main body, a lead wire as a terminal, and an explosion-proof valve. The steering device includes a heat sink as a metal case and a heat radiation material as a heat conduction member.
The radiator is formed with a recess into which a part of the case including the 2 nd side is inserted. The recess has a bottom portion with a gap formed between the bottom portion and the inserted housing at a predetermined interval. The case of the electrolytic capacitor is inserted into the recess so that the space between the recess and the 2 nd side surface is closer than the space between the recess and the peripheral surface of the case. Further, the heat radiation material is filled between the surface forming the recess of the heat sink and the 2 nd side surface of the case.
Disclosure of Invention
Problems to be solved by the invention
However, the thinner the thickness of the heat radiation material between the 2 nd side surface of the main body portion and the surface where the recess is formed, the more likely the explosion-proof valve penetrates the heat radiation material to come into contact with the surface where the recess is formed when the explosion-proof valve operates. That is, the working explosion proof valve may be in contact with the metal housing.
When the explosion-proof valve of the electrolytic capacitor is operated, an operation such as replacement of the electrolytic capacitor is performed by an operator. However, if the explosion-proof valve is in contact with the metal case, the substrate is electrically connected to the metal case, and thus the operation of the operator may be hindered. The electrolytic capacitor mounting structure is not limited to being applied to a steering device. Even if the electrolytic capacitor mounting structure is applied to a unit other than the steering device, the same concerns as described above arise.
On the other hand, it is desired to improve the heat dissipation of the electrolytic capacitor. Therefore, it is considered to reduce the gap between the 2 nd side surface of the main body and the surface where the recess is formed, but as described above, there is a possibility that the explosion-proof valve contacts the metal case. Therefore, methods for improving the heat dissipation of electrolytic capacitors are being studied.
Means for solving the problems
According to an aspect of the present disclosure, there is provided an electrolytic capacitor mounting structure. In the electrolytic capacitor mounting structure, an electrolytic capacitor is mounted on a substrate. The substrate is fixed to a metal case configured to dissipate heat of the electrolytic capacitor. A heat conduction member is provided between the metal case and the electrolytic capacitor, and is configured to mediate heat dissipation to the metal case. The electrolytic capacitor includes a tubular main body configured to house an electrode and an electrolyte therein, a terminal provided on a 1 st side surface of the main body and connected to the electrode, and an explosion-proof valve provided on a 2 nd side surface of the main body and configured to discharge the electrolyte to the outside. The heat conductive member is formed of a soft material of silicone system having a predetermined hardness. A recess having a bottom is formed in the metal case. The recess is configured to be inserted into a portion of the body portion including the 2 nd side face, and a gap of a predetermined interval is formed between the recess and the inserted body portion. The gap includes a portion where a distance between the recess and the 2 nd side surface is larger than a distance between the recess and the other surface of the main body portion. The heat conductive member is configured to fill the gap so as to cover the main body portion in the recess, and to allow deformation to restrict the electrolyte from flowing out of the recess when the explosion-proof valve is operated.
Drawings
Fig. 1 is a schematic view showing a structure of an electric compressor using the electrolytic capacitor mounting structure of embodiment 1.
Fig. 2 is a cross-sectional view showing an enlarged view of the electrolytic capacitor mounting structure of fig. 1.
Fig. 3 is a perspective view showing an explosion-proof valve of the electrolytic capacitor of fig. 1.
Fig. 4 is a cross-sectional view taken along line 4-4 of fig. 1.
Fig. 5 is a sectional view showing a state when the explosion-proof valve of the electrolytic capacitor of fig. 1 is operated.
Fig. 6 is a cross-sectional view showing an electrolytic capacitor mounting structure according to embodiment 2.
Fig. 7 is a cross-sectional view showing the recess and the heat conductive member when the explosion-proof valve of the electrolytic capacitor of fig. 6 is operated.
Fig. 8 is a cross-sectional view showing an electrolytic capacitor, a recess, and a heat conductive member in embodiment 3.
Fig. 9 is a cross-sectional view showing the electrolytic capacitor, the recess, and the heat conductive member when the explosion-proof valve of the electrolytic capacitor of fig. 8 is operated.
Detailed Description
[ embodiment 1 ]
Hereinafter, embodiment 1, in which an electrolytic capacitor mounting structure is embodied, will be described with reference to fig. 1 to 5. The electrolytic capacitor mounting structure of the present embodiment is applied to, for example, an electric compressor used in a vehicle air conditioner.
< electric compressor >)
As shown in fig. 1, the motor-driven compressor 10 includes a metal casing 20, a compression unit 30, a motor 40, and an inverter 50. The metal housing 20 has a cylindrical shape. The metal housing 20 is made of aluminum, for example. The metal case 20 is constituted by a plurality of case constituent bodies that are separable in the axial direction thereof.
The compression unit 30 compresses a refrigerant as a fluid. The compression unit 30 is a scroll composed of a fixed scroll and a movable scroll, not shown. The motor 40 drives the compression section 30. Inverter 50 drives motor 40. The metal case 20 houses the compression unit 30, the motor 40, and the inverter 50.
A motor chamber S1 and an inverter chamber S2 are formed in the metal case 20. The motor chamber S1 accommodates the motor 40. The inverter 50 is housed in the inverter chamber S2. The metal case 20 has a partition wall 21 that separates the motor chamber S1 and the inverter chamber S2.
The motor-driven compressor 10 includes an airtight terminal 60 and a plurality of electric wires 61. The airtight terminal 60 penetrates the dividing wall 21. The airtight terminal 60 is provided on the partition wall 21 in a state of maintaining airtightness between the motor chamber S1 and the inverter chamber S2. A plurality of wires 61 connect the airtight terminal 60 with the inverter 50, and connect the airtight terminal 60 with the motor 40.
< inverter >)
The inverter 50 has a substrate 51. A switching element and a circuit, not shown, are mounted on the substrate 51. The switching element converts a direct-current voltage from an external power source into an alternating-current voltage. The circuit supplies an ac voltage converted by a switching operation of a switching element, not shown, to the motor 40 via the airtight terminal 60 and the plurality of electric wires 61. Thereby, the motor 40 is driven by the inverter 50.
The substrate 51 is fixed to the dividing wall 21 by the fixing member 52. That is, the substrate 51 is fixed to the metal case 20. The substrate 51 has a mounting surface 51a opposed to the dividing wall 21. A plurality of electrolytic capacitors 53 are mounted on the mounting surface 51a. In the present embodiment, two electrolytic capacitors 53 are used. In the present embodiment, the two electrolytic capacitors 53 are the same product having the same shape and the same size. The two electrolytic capacitors 53 are arranged on the mounting surface 51a with a space therebetween.
The electrolytic capacitor 53 is an electronic component in which a smoothing circuit is formed on the substrate 51 together with a coil not shown. The electrolytic capacitor 53 is a filter element that reduces noise included in a current externally input to the substrate 51.
As shown in fig. 1 and 2, the electrolytic capacitor 53 includes a tubular main body 54 and a terminal 55. The main body 54 accommodates an electrode 53a and an electrolyte 53b therein.
As shown in fig. 2, the main body 54 has a 1 st side surface 54a, a 2 nd side surface 54b, and a peripheral surface 54c as the other surface. The 1 st side 54a faces the mounting surface 51a of the substrate 51. The 2 nd side surface 54b is a surface of the main body 54 opposite to the 1 st side surface 54 a. The 2 nd side 54b is opposite to the dividing wall 21. The peripheral surface 54c is a surface connecting the 1 st side surface 54a and the 2 nd side surface 54b. The terminal 55 is provided on the 1 st side 54a of the main body 54. The terminal 55 is connected to the electrode 53a in the body 54. The terminal 55 is electrically connected to the substrate 51. The terminal 55 is connected to a circuit, not shown, of the substrate 51.
As shown in fig. 3, the electrolytic capacitor 53 includes an explosion-proof valve 56. The explosion-proof valve 56 is provided on the 2 nd side 54b of the main body 54. The explosion-proof valve 56 operates when the pressure in the main body 54 exceeds a predetermined pressure, and discharges the electrolyte 53b to the outside of the main body 54.
As shown in fig. 1 and 2, a heat conduction member 70 is provided between the partition wall 21 and the two electrolytic capacitors 53. That is, the heat conductive member 70 is provided between the metal case 20 and the electrolytic capacitor 53.
The heat conductive member 70 is a silicone-based soft material having a predetermined hardness. The heat conductive member 70 is, for example, silCool manufactured by Momentive Performance Materials company TM TIS420C cured heat dissipating silicon gap filler.
< electrolytic capacitor mounting Structure >)
Fig. 1 and 2 show an electrolytic capacitor mounting structure 100. Two electrolytic capacitors 53 are mounted on the substrate 51 and are in contact with the heat conductive member 70. The electrolytic capacitor 53 is positioned with respect to the metal case 20 by being sandwiched by the substrate 51 and the heat conductive member 70.
The heat generated in the two electrolytic capacitors 53 is transferred to the heat conduction member 70. The heat transferred to the heat conductive member 70 is radiated from the partition wall 21, i.e., the metal case 20, to the outside. The heat of the electrolytic capacitor 53 is radiated to the metal case 20. The heat conductive member 70 mediates heat dissipation from the electrolytic capacitor 53 to the metal case 20.
Hereinafter, the electrolytic capacitor mounting structure 100 will be described in more detail.
As shown in fig. 2, the partition wall 21 is formed with a recess 22 recessed in a direction in which the electrolytic capacitor 53 protrudes from the substrate 51. A part of the main body 54 of the plurality of electrolytic capacitors 53 is inserted into the recess 22. The recess 22 has a bottom. The face forming the recess 22 has a bottom face 22a and side faces 22b. The side surface 22b is continuous with the bottom surface 22 a.
The 2 nd side surfaces 54b of the two electrolytic capacitors 53 are opposed to the bottom surface 22a of the recess 22 with a gap G1 therebetween. The peripheral surfaces 54c of the two electrolytic capacitors 53 face the side surfaces 22b of the recess 22 with a gap G2 therebetween. That is, a part of the body 54 including the 2 nd side 54b of the electrolytic capacitor 53 is inserted into the recess 22, and gaps G1, G2 of a predetermined interval are formed between the recess 22 and the inserted body 54.
The distance between the 2 nd side surface 54b of the main body 54 and the bottom surface 22a of the recess 22 is set to be L1. One of the two electrolytic capacitors 53 is referred to as a 1 st electrolytic capacitor 531, and the other is referred to as a 2 nd electrolytic capacitor 532. The interval L1 may be changed according to the inclination or shape of the bottom surface 22a, and indicates the length of the closest portion between the 2 nd side surface 54b of the main body 54 and the bottom surface 22 a.
The minimum interval L2 of the intervals between the peripheral surface 54c of the main body 54 and the side surface 22b of the recess 22 in the 1 st electrolytic capacitor 531 is smaller than the interval L1. Therefore, in the electrolytic capacitor 531 of 1 st, there is a portion at least smaller than the interval L1 in the interval between the peripheral surface 54c of the main body 54 and the side surface 22b of the recess 22.
The minimum distance L3 among the distances between the peripheral surface 54c of the main body 54 of the 2 nd electrolytic capacitor 532 and the side surface 22b of the recess 22 is smaller than the distance L1. Therefore, in the electrolytic capacitor 532 of fig. 2, at least a portion smaller than the interval L1 is present in the interval between the peripheral surface 54c of the main body 54 and the side surface 22b of the recess 22. That is, the body 54 of the electrolytic capacitor 53 is inserted into the recess 22 with the gaps G1 and G2 maintained so that the gap L1 between the recess 22 and the 2 nd side surface 54b is larger than the gaps L2 and L3 between the recess 22 and the peripheral surface 54c of the body 54.
The heat conductive member 70 fills the gaps G1 and G2 so as to cover the respective body portions 54 in the recess 22. The heat conductive member 70 is gel-like when filled in the gaps G1 and G2 of the recess 22. The heat conductive member 70 is interposed between the adjacent main body portions 54 for all the electrolytic capacitors 53. After the gaps G1 and G2 are filled with the heat conductive member 70, a part of the main body 54 of all the electrolytic capacitors 53 is inserted into the recess 22, and the surface is cured after a predetermined time. The heat conductive member 70 is in a flexible state. The heat conductive member 70 is an adhesive material. The adhesive material is a material in a state where internal curing is not performed. The heat conductive member 70 is in contact with the 2 nd side 54b of the main body 54 of the electrolytic capacitor 53. The heat conductive member 70 covers the entire peripheral surface 54c of the main body 54 located in the recess 22.
As shown in fig. 1, the heat conductive member 70 bulges from the recess 22. The main body 54 of the electrolytic capacitor 53 is also covered with the bulged heat conductive member 70. The heat conductive member 70 bulging from the recess 22 covers a part of the peripheral surface 54c of the main body 54 located outside the recess 22. The interval L1 is set to a value such that the tip of the explosion-proof valve 56 does not reach the bottom surface 22a of the recess 22 when the explosion-proof valve 56 of the electrolytic capacitor 53 is operated. More specifically, the interval L1 is set in consideration of the balance between the amount of protrusion of the explosion-proof valve 56 from the 2 nd side surface 54b of the main body 54 and the hardness of the heat conductive member 70, which is assumed when the explosion-proof valve 56 is operated.
Mounting posture of electric compressor
Fig. 4 shows a state in which the inverter chamber S2 is seen in front in the axial direction of the metal case 20. In fig. 4, the substrate 51 and the recess 22 are virtually shown by dotted lines.
As shown in fig. 2 and 4, the motor-driven compressor 10 is mounted on the vehicle such that all electrolytic capacitors 53 are located above the airtight terminal 60 in the vertical direction Vd.
< partition wall >)
A partition wall 23 is formed in the partition wall 21. That is, the metal case 20 has a partition wall 23. The partition wall 23 protrudes from the partition wall 21 toward the substrate 51. The partition wall 23 is integrally formed with the partition wall 21. Therefore, the partition wall 23 is made of the same metal material as the metal housing 20. The partition wall 23 is not in contact with the mounting surface 51a of the substrate 51.
The partition wall 23 extends so as to partition between the two electrolytic capacitors 53 and the airtight terminal 60. The partition wall 23 has a 1 st facing surface 23a and a 2 nd facing surface 23b. The 1 st opposing surface 23a opposes the electrolytic capacitor 53 in the vertical direction Vd. The 1 st opposing surface 23a is the upper surface of the partition wall 23. The 2 nd facing surface 23b faces the airtight terminal 60 in the vertical direction Vd. The 2 nd opposing surface 23b is a lower surface of the partition wall 23.
[ action of the present embodiment ]
The operation of the present embodiment will be described.
The heat of the electrolytic capacitor 53 is transferred to the metal case 20 via the heat conductive member 70. Therefore, the heat of the electrolytic capacitor 53 is radiated to the metal case 20 through the heat conductive member 70.
As shown in fig. 5, the explosion-proof valve 56 operates when the pressure in the main body 54 of the electrolytic capacitor 53 exceeds a predetermined pressure. When the explosion-proof valve 56 is operated, the electrolyte 53b is discharged to the outside of the main body 54. At this time, the explosion-proof valve 56 pushes away a part of the heat conductive member 70, thereby forming a liquid storage space 71 between the heat conductive member 70 and the electrolytic capacitor 53 in which the explosion-proof valve 56 operates. Thus, the electrolyte 53b is stored in the liquid storage space 71.
The heat conductive member 70 is pressed toward the side surface 22b of the recess 22 by an amount pushed away for forming the liquid storage space 71. When the heat conductive member 70 is pressed against the side surface 22b of the recess 22, the peripheral surface 54c of the electrolytic capacitor 53 is more firmly adhered to the heat conductive member 70. Then, since the sealability of the liquid storage space 71 is improved, the electrolyte 53b is less likely to leak from between the heat conductive member 70 and the peripheral surface 54c of the electrolytic capacitor 53. Accordingly, the heat conductive member 70 is allowed to deform to restrict the flow of the electrolyte 53b out of the recess 22 when the explosion-proof valve 56 is operated.
Further, it is assumed that the electrolyte 53b is transferred between the heat conductive member 70 and the peripheral surface 54c of the electrolytic capacitor 53, and flows out from the recess 22. In this case, the discharged electrolyte 53b flows downward in the vertical direction Vd due to its own weight. However, since the partition wall 23 is provided between the electrolytic capacitor 53 and the airtight terminal 60, the electrolytic solution 53b flowing out is blocked by the 1 st facing surface 23a of the partition wall 23 as indicated by the two-dot chain line in fig. 5. This can prevent the flowing electrolyte 53b from reaching the airtight terminal 60.
The body 54 of the electrolytic capacitor 53 is inserted into the recess 22 with the gaps G1 and G2 maintained so that the gap L1 is larger than the gaps L2 and L3. Accordingly, when the explosion-proof valve 56 is operated, the explosion-proof valve 56 is easily prevented from contacting the metal case 20 by penetrating the heat conductive member 70, and heat of the electrolytic capacitor 53 is easily radiated from the peripheral surface 54c of the main body 54 to the side surface 22b of the recess 22.
[ Effect of the present embodiment ]
Effects of the present embodiment will be described.
(1-1) according to the present embodiment, a state in which the explosion-proof valve 56 is away from the bottom surface 22a of the recess 22 and the peripheral surface 54c of the main body 54 is brought close to the side surface 22b of the recess 22 is easily achieved. Therefore, contact between the explosion-proof valve 56 and the metal case 20 can be suppressed, and heat dissipation of the electrolytic capacitor 53 can be improved.
(1-2) the heat conductive member 70 is an adhesive material whose inside is kept in a flexible state even if its outside is cured. Therefore, even if vibration occurs in the electrolytic capacitor 53, for example, vibration of the electrolytic capacitor 53 is easily absorbed by the heat conductive member 70. This stabilizes the connection state between the terminal 55 of the electrolytic capacitor 53 and the substrate 51.
(1-3) the heat conductive member 70 is interposed between the main body portions 54 of all the electrolytic capacitors 53. Therefore, since each of the main body portions 54 of all the electrolytic capacitors 53 is in contact with the heat conductive member 70, the heat of all the electrolytic capacitors 53 is transferred to the metal case 20 via the heat conductive member 70. Therefore, the heat of all electrolytic capacitors 53 can be efficiently dissipated to metal case 20.
(1-4) the main body portion 54 of the electrolytic capacitor 53 is also covered with the heat conductive member 70 bulging from the recess 22. Therefore, heat of the electrolytic capacitor 53 is more easily transferred from the heat conductive member 70 to the metal case 20. This can improve the heat dissipation performance of the electrolytic capacitor 53.
(1-5) even if the explosion-proof valve 56 is operated, the heat conductive member 70 is deformed so that the electrolyte 53b does not flow out of the recess 22. Thus, the liquid storage space 71 for the electrolyte 53b is not required to be formed in advance between the 2 nd side surface 54b of the main body 54 and the heat conductive member 70, and thus the sealing structure of the electrolyte 53b is simplified.
(1-6) after the explosion-proof valve 56 is operated, even if the electrolyte 53b flows out from the recess 22, the electrolyte 53b hardly reaches the airtight terminal 60 due to being blocked by the partition wall 23. This can suppress a short circuit between the airtight terminal 60 and the inverter 50.
[ embodiment 2 ]
Hereinafter, embodiment 2, in which an electrolytic capacitor mounting structure is embodied, will be described with reference to fig. 6 and 7. Note that the same configuration as in embodiment 1 is denoted by the same reference numeral, and a detailed description thereof is omitted.
Relation between recess and heat conductive member
As shown in fig. 6, the heat conductive member 70 is filled only in the concave portion 22. In the present embodiment, the heat conductive member 70 fills the entire area inside the recess 22, and does not bulge out from the recess 22.
As shown in fig. 7, when the explosion-proof valve 56 is operated, a part of the heat conductive member 70 bulges out from the recess 22. That is, the heat conductive member 70 is filled only in the recess 22 before the explosion-proof valve 56 is operated.
[ action and Effect of the present embodiment ]
The operation and effects of the present embodiment will be described.
(2-1) before the explosion-proof valve 56 is operated, the heat conductive member 70 is filled only in the recess 22. When the explosion-proof valve 56 is operated and the heat conductive member 70 is deformed, it bulges out of the recess 22. Therefore, it is possible to confirm whether or not the explosion-proof valve 56 is operated without separating the heat conductive member 70 from the main body 54 of the electrolytic capacitor 53. Further, it is possible to confirm whether or not the explosion-proof valve 56 is operated without removing the substrate 51 from the metal housing 20. This makes it possible to confirm whether or not the explosion-proof valve 56 is operating.
[ embodiment 3 ]
Hereinafter, embodiment 3, in which an electrolytic capacitor mounting structure is embodied, will be described with reference to fig. 8 and 9. Note that the same configuration as in embodiment 1 is denoted by the same reference numeral, and a detailed description thereof is omitted.
Relation of electrolytic capacitor, concave portion, and heat conductive member
As shown in fig. 8, in the present embodiment, a part of the main body 54 of one electrolytic capacitor 53 is inserted into the recess 22. The gap G1 is a 1 st gap between the 2 nd side surface 54b of the main body 54 and the recess 22. The gap G2 is the 2 nd gap between the peripheral surface 54c of the main body 54 and the recess 22.
The interval L1 between the 2 nd side surface 54b of the main body 54 and the bottom surface 22a of the recess 22 is the same as that of embodiment 1. The interval L4 between the peripheral surface 54c of the body 54 and the side surface 22b of the recess 22 is smaller than the interval L1 in the entire circumferential direction of the body 54. That is, gap G1 is larger than gap G2. The interval L4 is set to a level at which heat of the electrolytic capacitor 53 can be radiated from the side surface 22b of the recess 22.
The heat conductive member 70 is filled only in the recess 22 before the explosion-proof valve 56 is operated. The heat conductive member 70 is filled in the gap G1. The heat conductive member 70 is in contact with a portion of the bottom surface 22a of the recess 22 and a portion of the side surface 22b of the recess 22. The heat conductive member 70 covers only the 2 nd side 54b of the main body 54. That is, the heat conductive member 70 is not filled in the gap G2.
As shown in fig. 9, when the explosion-proof valve 56 is operated, a part of the heat conducting member 70 bulges between the peripheral surface 54c of the main body 54 and the side surface 22b of the recess 22. In the present embodiment, the heat conductive member 70 does not bulge out from the recess 22. That is, in the case where the explosion-proof valve 56 is operated, the heat conductive member 70 approaches the opening of the recess 22.
[ action and Effect of the present embodiment ]
According to the present embodiment, the same effects as those of embodiment 1 and the same effects as those of (1-1) of embodiment 1 can be obtained, and the following effects can be obtained.
(3-1) before the explosion-proof valve 56 is operated, the heat conductive member 70 is filled only in the recess 22. When the explosion-proof valve 56 is operated and the heat conductive member 70 is deformed, the heat conductive member 70 approaches the opening of the recess 22. Therefore, it is possible to confirm whether or not the explosion-proof valve 56 is operated without separating the heat conductive member 70 from the main body 54 of the electrolytic capacitor 53. Further, it is possible to confirm whether or not the explosion-proof valve 56 is operated without removing the substrate 51 from the metal housing 20. Therefore, whether the explosion proof valve 56 is operated can be well confirmed.
(3-2) inserting a part of the main body 54 of one electrolytic capacitor 53 into the recess 22. Therefore, for example, if a plurality of electrolytic capacitors 53 are mounted on the substrate 51 and the concave portions 22 corresponding to each of all the electrolytic capacitors 53 are provided, the heat dissipation performance of each of all the electrolytic capacitors 53 is improved.
Modification example
The above embodiments may be modified as follows. The above-described embodiments and the following modifications can be combined with each other within a range not inconsistent in technology.
In embodiment 3, the heat conductive member 70 may be filled in the gap G2 before the explosion-proof valve 56 is operated. The thermally conductive member 70 may bulge out of the recess 22 prior to operation of the explosion proof valve 56. The main body 54 may be covered with the heat conductive member 70 protruding from the recess 22. In the case where the explosion-proof valve 56 is operated, the heat conductive member 70 may bulge out from the recess 22.
In embodiment 1 and embodiment 2, 3 or more electrolytic capacitors 53 may be used. Even in the case of such a modification, the heat conductive member 70 may be interposed between the main body portions 54 of all the electrolytic capacitors 53.
In embodiment o 1 and embodiment 2 and the modification described above, all electrolytic capacitors 53 may not be the same product having the same shape and the same size. The interval between the 2 nd side surface 54b of the main body 54 of each electrolytic capacitor 53 and the bottom surface 22a of the recess 22 may be different depending on the electrolytic capacitor 53. In this case, the main body 54 of the electrolytic capacitor 53 is changed to a position where the interval between the recess 22 and the 2 nd side surface 54b is larger than the interval between the recess 22 and the peripheral surface 54c of the main body 54.
In embodiment o 1 and embodiment 2 and the modification described above, there may be a portion between the body portions 54 of the electrolytic capacitor 53 where the heat conductive member 70 is not interposed. The heat conductive member 70 may cover at least the 2 nd side surface 54b of the main body 54 of the electrolytic capacitor 53.
In the above embodiments, the concave portion 22 has the bottom surface 22a and the side surface 22b, but the shape of the surface forming the concave portion 22 may be appropriately changed. The surface forming the recess 22 has a shape in which the body 54 can be inserted into the recess 22 so that there is a portion where the distance between the recess 22 and the 2 nd side surface 54b is larger than the distance between the recess 22 and the peripheral surface 54c of the body 54.
In the above embodiments, the heat conductive member 70 may be made of, for example, a silicone composite material that is a soft silicone material. The silicone composite material is, for example, a material softer than the joint seal of silicone rubber material. That is, the silicone-based soft material forming the heat conductive member 70 may be appropriately changed. Further, the heat conductive member 70 may not be an adhesive material as the material used for forming the heat conductive member 70 is changed.
In the above embodiments, the shape of the partition wall 23 may be changed as appropriate as long as the partition wall can separate the electrolytic capacitor 53 from the airtight terminal 60. In addition, the partition wall 23 may not be integrally formed with the partition wall 21. The partition wall 23 may be other components mounted with respect to the partition wall 21.
In the above embodiments, the metal case 20 may omit the partition wall 23.
In the above embodiments, the compression unit 30 is not limited to the scroll type, and may be, for example, a piston type or a vane type.
In the above embodiments, the electric compressor 10 is used for a vehicle air conditioner, but is not limited thereto. For example, the motor-driven compressor 10 may be mounted on a fuel cell vehicle, and may compress air, which is a fluid supplied to a fuel cell.
The electrolytic capacitor mounting structure 100 is applicable to the motor-driven compressor 10, but the object to be applied may be changed.

Claims (6)

1. An electrolytic capacitor mounting structure, which is provided with a plurality of mounting holes,
the electrolytic capacitor is mounted on a substrate,
the substrate is fixed on a metal case configured to dissipate heat of the electrolytic capacitor,
a heat conduction member is provided between the metal case and the electrolytic capacitor, the heat conduction member being configured to mediate heat dissipation to the metal case,
the electrolytic capacitor comprises a cylindrical main body, a terminal and an explosion-proof valve,
the main body part is configured to house the electrode and the electrolyte inside,
the terminal is arranged on the 1 st side surface of the main body part and is connected with the electrode,
the explosion-proof valve is arranged on the 2 nd side surface of the main body part and is configured to discharge the electrolyte to the outside,
the heat conductive member is formed of a soft material of silicone series having a predetermined hardness,
a recess having a bottom is formed in the metal case,
the recess is configured to be inserted into a part of the body portion including the 2 nd side, and a gap of a predetermined interval is formed between the recess and the inserted body portion,
the gap includes a portion where a distance between the recess and the 2 nd side surface is larger than a distance between the recess and the other surface of the main body portion,
the heat conductive member is configured to fill the gap so as to cover the main body portion in the recess, and to allow deformation to restrict the electrolyte from flowing out of the recess when the explosion-proof valve is operated.
2. The electrolytic capacitor mounting structure according to claim 1,
the heat conducting component is made of adhesive materials.
3. The electrolytic capacitor mounting structure according to claim 1 or 2,
only one of the electrolytic capacitors is inserted into one of the recesses,
the other surface has a peripheral surface connecting the 1 st side surface and the 2 nd side surface,
the gap has a 1 st gap between the 2 nd side surface and the recess and a 2 nd gap between the peripheral surface and the recess,
the 1 st gap is larger than the 2 nd gap.
4. The electrolytic capacitor mounting structure according to claim 1 or 2,
inserting a plurality of electrolytic capacitors into one of the recesses,
the heat conductive member is interposed between the main body portions of all of the plurality of electrolytic capacitors.
5. The electrolytic capacitor mounting structure according to any one of claims 1 to 4,
in a state before the explosion-proof valve is operated, the heat conduction member is filled only in the concave portion.
6. The electrolytic capacitor mounting structure according to any one of claims 1 to 4,
the heat conductive member is bulged from the concave portion,
the main body portion of the electrolytic capacitor is also covered with the heat conductive member bulging from the concave portion.
CN202310220075.XA 2022-03-18 2023-03-09 Electrolytic capacitor mounting structure Pending CN116779336A (en)

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JP2022043986A JP2023137683A (en) 2022-03-18 2022-03-18 Mounting structure for electrolytic capacitor
JP2022-043986 2022-03-18

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Publication number Priority date Publication date Assignee Title
WO2018088162A1 (en) 2016-11-11 2018-05-17 日本精工株式会社 Electronic control device and steering device

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