Thin film capacitor

Abstract

The utility model relates to a film capacitor, which comprises a shell and a capacitor body arranged in the shell, a plurality of side parts of the shell are respectively inserted with a heat dissipation and dehumidification piece, the heat dissipation and dehumidification piece comprises a T-shaped block, a plurality of through pipes with two open ends are arranged in the heat dissipation and dehumidification piece along the axis direction, a plurality of drying particles are arranged in the through pipes, and the T-shaped block is inserted into the capacitor body. The other end of the T-shaped block extends to the outer side of the shell, and a memory temperature pushing part is arranged between the capacitor body and the T-shaped block; when the internal temperature of the shell rises, the memory temperature pushing part is influenced by the temperature to push one end, located outside the shell, of the heat dissipation and dehumidification piece to ventilate, and when the internal temperature of the shell recovers to the normal heat dissipation temperature, the memory temperature pushing part is influenced by the temperature to reset the heat dissipation and dehumidification piece, so that the end, located outside the shell, of the heat dissipation and dehumidification piece abuts against the shell to be closed. According to the utility model, the interior of the shell can be in a dry environment continuously, and the capacitor body is prevented from being damaged due to the fact that the interior of the shell is moist during air exchange.

Description

TECHNICAL FIELD

[0001] The utility model relates to capacitor technical field especially relates to a film capacitor. BACKGROUND

[0002] Film capacitor is with metal foil as electrode, its and polyethylene, polypropylene, polystyrene or polycarbonate plastic film, from two ends overlap, winding into the structure of the capacitor of cylindrical. The existing film capacitor in order to guarantee the insulation of internal electrode, the shell of film capacitor is usually full sealing structure design, when the temperature of film capacitor inside rises, the shell of full sealing structure design cannot effectively radiate film capacitor.

[0003] The patent with the application number CN202320233467.5 discloses a film capacitor, which comprises a body and a shell fixedly arranged on the outer side of the body, a plurality of first through holes are formed on the two sides of the shell, a plurality of cover plates are arranged on the two sides of the shell, a push plate and a thermal expansion assembly are further arranged in the shell, and the push plate is fixedly connected with the cover plate and slidably connected with the shell.

[0004] Although the above-mentioned capacitor can release the heat inside the capacitor shell by opening the through hole when the temperature rises to a certain height, but when the through hole is opened, the moisture outside the capacitor can easily enter the shell and damage the capacitor. UTILITY MODEL CONTENTS

[0005] The utility model provides a film capacitor in view of the deficiency of prior art, and the specific technical scheme is as follows:

[0006] A film capacitor, comprising a shell and a capacitor body arranged in the shell, a plurality of sides of the shell are inserted with heat dissipation and dehumidification pieces, the heat dissipation and dehumidification piece comprises a T-shaped block, a plurality of open-ended through pipes are arranged in the heat dissipation and dehumidification piece along the axial direction, a plurality of dry particles are arranged in the through pipe, one end of the T-shaped block on the same side of the shell extends to the inside of the shell, and the other end extends to the outside of the shell, a memory temperature pushing part is arranged between the capacitor body and the T-shaped block.

[0007] When the temperature inside the shell rises, the memory temperature pushing part drives the heat dissipation and dehumidification piece to ventilate at one end outside the shell under the influence of temperature, and when the temperature inside the shell returns to the normal heat dissipation temperature, the memory temperature pushing part resets the heat dissipation and dehumidification piece to close the air at one end outside the shell.

[0008] As the improvement of the above technical scheme: the T-shaped block is internally provided with a U-shaped through slot at one end of the outer side of the shell, both ends of the U-shaped through slot penetrate through to the outer side of the T-shaped block, and a filter screen is mounted at both ends of the U-shaped through slot, and one end of the plurality of through pipes penetrates through the U-shaped through slot.

[0009] As the improvement of the above technical scheme: the side wall of the through pipe in one direction is provided with a plurality of inclined plates, the plurality of inclined plates are arranged in an inclined downward manner, and the end surface of the inclined plate in the inclined downward manner is provided with a gap with the side wall of the through pipe, and part of the dry particles are placed on the inclined plate.

[0010] As the improvement of the above technical scheme: the outer side of the capacitor body is connected with a protective shell, the protective shell comprises a polypropylene film and a heat conduction sheet, the polypropylene film is connected to the outer side of the capacitor body, and the heat conduction sheet is fixedly connected to the outer side of the polypropylene film.

[0011] As the improvement of the above technical scheme: the memory temperature pushing part comprises a moving plate and a plurality of arc-shaped memory metal sheets, the moving plate is slidably connected to the inner side of the shell, one end of the arc-shaped memory metal sheet is connected to the protective shell, a plurality of telescopic sleeve rods are fixedly connected between the side, away from the protective shell, of the moving plate and the inner side of the shell, and springs are sleeved on the surfaces of the telescopic sleeve rods.

[0012] As the improvement of the above technical scheme: the T-shaped block is fixedly connected with the moving plate through a connecting rod, and a plurality of through holes with the same shaft as the heat dissipation and dehumidification part are arranged on the moving plate.

[0013] The utility model discloses beneficial effect:

[0014] When the temperature in the shell is high, that is, the arc-shaped memory metal sheet is stretched, the end of the arc-shaped memory metal sheet, away from the protective shell, will push the moving plate to drive the heat dissipation and dehumidification part to push out, so that the U-shaped through slot is in an open state and the heat dissipation and dehumidification part is ventilated, the hot air in the shell will be dissipated to the outside of the shell through the plurality of through pipes and the U-shaped through slot, and the air in the outside exchanges with the air in the shell, and the moisture in the air in the outside is absorbed by the plurality of through pipes, so that the inside of the shell is kept in a dry environment, and the capacitor body is prevented from being damaged due to moisture in the air exchange.

[0015] When the temperature gradually decreases, the arc-shaped memory metal sheet will shrink inward, at this time, the compressed spring will push the moving plate to drive the T-shaped block to reset, so that the U-shaped through slot on the T-shaped block is in contact with the shell and is in a closed state, thereby keeping the sealing environment of the shell. DRAWINGS

[0016] Figure 1 It is an internal structure diagram of the whole utility model;

[0017] Figure 2 As Figure 1 Enlarged structural schematic view of the place A in the middle;

[0018] Figure 3 Structural schematic view of the heat radiating and dehumidifying part in the utility model;

[0019] Figure 4 Structural schematic view of the protective shell in the utility model.

[0020] The figure mark: 1, the shell; 2, capacitor body; 3, protective shell; 31, polypropylene film; 32, heat conduction sheet; 5, arc memory metal sheet; 6, moving plate; 60, through mouth; 7, telescopic sleeve rod; 71, spring; 8, heat radiating and dehumidifying part; 80, U-shaped through slot; 81, T-shaped block; 82, through pipe; 83, filter screen; 84, inclined plate; 85, dry granule; 86, connecting rod. Specific implementation

[0021] In order to make the utility model's purpose, technical scheme and advantage more clearly, following combining with the drawing and example, the utility model is further detailedly explained.It should be understood that the specific example described here is only used to explain the utility model, and is not used to limit the utility model.

[0022] Example

[0023] Please refer to Figures 1-4 A film capacitor, including shell 1 and the capacitor body 2 being arranged in the shell 1 inside, the multiple side of shell 1 is inserted with heat radiating and dehumidifying part 8, the heat radiating and dehumidifying part 8 includes T-shaped block 81, the heat radiating and dehumidifying part 8 inside along the axis direction arrangement is provided with multiple two ends open through pipe 82, the through pipe 82 is equipped with multiple dry granule 85, the multiple T-shaped block 81 in the same side of the shell 1 one end extends to the shell 1 inside, the other end extends to the outside of shell 1, the capacitor body 2 and T-shaped block 81 between setting has memory temperature push part;Specifically, dry granule 85 can adopt prior art dry granule material, can mainly include aerogel, polysilicon etc..These materials can regain or enhance its hygroscopic drying capacity under certain conditions, such as high temperature, since the application is in high temperature environment under certain frequency when working, dry granule 85 can restore its hygroscopic effect by high temperature for a long time, so that dry granule 85 can continuously maintain the drying performance in the application.

[0024] When the temperature inside shell 1 rises, memory temperature push part is pushed by temperature and ventilates the one end of heat radiating and dehumidifying part 8 outside shell 1, when the temperature inside shell 1 restores to normal heat dissipation temperature, memory temperature push part resets heat radiating and dehumidifying part 8 to make heat radiating and dehumidifying part 8 one end outside shell 1 resist shell 1 and close air.

[0025] In an alternative embodiment: specifically, the large end of the T-shaped block 81 is located outside the shell 1, so as to ensure contact with the outside of the shell 1, and the end of the T-shaped block 81 inside the shell 1 is provided with a U-shaped through slot 80, both ends of the U-shaped through slot 80 penetrating to the outside of the T-shaped block 81, and a filter screen 83 is installed at both ends of the U-shaped through slot 80, so as to avoid dust and impurities from the outside entering the inside of the heat dissipation and dehumidification piece 8, and one end of each of the plurality of through pipes 82 penetrates the U-shaped through slot 80.

[0026] In an alternative embodiment: one side of each of the through pipes 82 has a plurality of inclined plates 84, and the plurality of inclined plates 84 are arranged in an inclined downward manner, and the inclined downward end surface of the inclined plate 84 forms a gap with the side wall of the through pipe 82, and part of the dry particles 85 are placed on the inclined plate 84, so that the dry particles 85 inside the through pipe 82 can be better dispersed to each position in the through pipe 82, and the moisture absorption effect of each dry particle 85 is ensured.

[0027] In an alternative embodiment: the outside of the capacitor body 2 is connected with a protective shell 3, the protective shell 3 includes a polypropylene film 31 and a heat conducting sheet 32, the polypropylene film 31 is connected to the outside of the capacitor body 2, and the heat conducting sheet 32 is fixedly connected to the outside of the polypropylene film 31, and specifically, the polypropylene film 31 improves the high temperature resistance and protection effect of the capacitor body 2.

[0028] In an alternative embodiment: the memory temperature pushing part includes a moving plate 6 and a plurality of arc-shaped memory metal sheets 5, the moving plate 6 is slidingly connected to the inside of the shell 1, one end of the arc-shaped memory metal sheet 5 is connected with the protective shell 3, a plurality of telescopic sleeve rods 7 are fixedly connected between the side of the moving plate 6 away from the protective shell 3 and the inside of the shell 1, and a spring 71 is sleeved on the surface of the telescopic sleeve rod 7.

[0029] In an optional embodiment: the T-shaped block 81 is fixedly connected to the movable plate 6 via a connecting rod 86. The movable plate 6 has multiple openings 60 coaxial with the heat dissipation and dehumidification component 8, thereby facilitating airflow into the interior of the heat dissipation and dehumidification component 8. The arc-shaped memory metal sheet 5 can be made of nickel-titanium alloy, copper-based memory metal, or iron-based memory metal. At a preset temperature of 40-70℃, it gradually stretches and deforms; below 40℃, it gradually recovers and contracts. When the temperature inside the shell 1 is high, i.e., when the arc-shaped memory metal sheet 5 is stretched, the end of the arc-shaped memory metal sheet 5 away from the protective shell 3 pushes the movable plate 6, causing the heat dissipation and dehumidification component 8 to be pushed outwards, opening the U-shaped channel 80. When the opening changes, the heat dissipation and dehumidification component 8 is ventilated. The hot air inside the housing 1 will be dispersed to the outside of the housing 1 through multiple pipes 82 and U-shaped grooves 80, exchanging with the outside air. In this state, the moisture in the outside air will be absorbed by the multiple pipes 82 dispersed inside the pipes 82, keeping the inside of the housing 1 in a dry environment and preventing the inside of the housing 1 from becoming damp during air exchange, which could damage the capacitor body 2. When the temperature gradually decreases, the arc-shaped memory metal sheet 5 will contract inward. At this time, the compressed spring 71 will push the moving plate 6 to reset the T-shaped block 81, so that the U-shaped groove 80 on the T-shaped block 81 contacts the housing 1 and is in a closed state, thereby maintaining the sealed environment of the housing 1.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A thin film capacitor comprising a case (1) and a capacitor body (2) disposed inside the case (1), characterized by, The shell (1) is inserted with a plurality of heat dissipation and dehumidification elements (8) on each side, the heat dissipation and dehumidification element (8) comprises a T-shaped block (81), a plurality of open-ended pipes (82) are arranged along the axis direction inside the heat dissipation and dehumidification element (8), a plurality of dry particles (85) are arranged in the pipe (82), one end of the T-shaped block (81) on the same side of the shell (1) extends to the inside of the shell (1), and the other end extends to the outside of the shell (1), and a memory temperature pushing part is arranged between the capacitor body (2) and the T-shaped block (81). When the temperature inside the shell (1) rises, the memory temperature pushing part is affected by the temperature to push the heat dissipation and dehumidification element (8) to ventilate at one end outside the shell (1), and when the temperature inside the shell (1) returns to the normal heat dissipation temperature, the memory temperature pushing part is affected by the temperature to reset the heat dissipation and dehumidification element (8), so that the heat dissipation and dehumidification element (8) at one end outside the shell (1) is closed to the shell (1).

2. A thin film capacitor as defined in claim 1, wherein: The T-shaped block (81) is provided with a U-shaped groove (80) inside one end outside the shell (1), the two ends of the U-shaped groove (80) penetrate to the outside of the T-shaped block (81), and the two ends of the U-shaped groove (80) are provided with filter screens (83), and one end of the plurality of pipes (82) penetrates the U-shaped groove (80).

3. A thin film capacitor as defined in claim 2, wherein: One side wall of the pipe (82) has a plurality of inclined plates (84), the plurality of inclined plates (84) are arranged in an inclined downward manner, and the inclined downward end surface of the inclined plate (84) forms a gap with the side wall of the pipe (82), and part of the dry particles (85) are arranged on the inclined plate (84).

4. A thin film capacitor as defined in claim 3, wherein: The outside of the capacitor body (2) is connected with a protective shell (3), the protective shell (3) comprises a polypropylene film (31) and a heat conducting sheet (32), the polypropylene film (31) is connected to the outside of the capacitor body (2), and the heat conducting sheet (32) is fixedly connected to the outside of the polypropylene film (31).

5. A thin film capacitor as defined in claim 4, wherein: The memory temperature pushing part comprises a moving plate (6) and a plurality of arc-shaped memory metal sheets (5), the moving plate (6) is slidably connected to the inside of the shell (1), one end of the arc-shaped memory metal sheet (5) is connected to the protective shell (3), a plurality of telescopic sleeve rods (7) are fixedly connected between the side of the moving plate (6) away from the protective shell (3) and the inside of the shell (1), and springs (71) are arranged on the surface of the telescopic sleeve rod (7).

6. A thin film capacitor as defined in claim 5, wherein: The T-shaped block (81) is fixedly connected with the moving plate (6) through a connecting rod (86), and a plurality of through holes (60) with the same axis as the heat dissipation and dehumidification element (8) are arranged on the moving plate (6).

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