Thin film capacitor

Abstract

The utility model discloses a film capacitor, comprising a housing and a capacitor body, the housing is sleeved outside the capacitor body, the top of the housing is provided with a cooling box, and the outer wall of the cooling box is provided with four connecting pipes which are distributed in a cross shape. A motor is installed at the inner top of the shell, the power output end of the motor extends into the cooling box and is connected with fan blades, a middle hole communicated with the cooling box and a side hole communicated with the connecting pipe are formed in the top of the shell, three positioning rings are installed on the inner wall of the shell, and a plurality of annularly-distributed cooling fins are arranged between the adjacent positioning rings. The shell is sleeved outside the capacitor, the cooling box is arranged at the top of the shell, the fan blades in the cooling box are driven by the motor to rotate, and after the fan blades rotate, external air is brought into the interior and blown into the shell through the middle hole and the side holes, so that the interior of the shell is cooled, and the influence of high temperature on the capacitor in the long-time use process is reduced; the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a film capacitor. Background Art

[0002] A film capacitor is a component capable of storing charge. Its basic structure consists of two conductive plates with a different dielectric material positioned between them. The operating process of a capacitor can be understood as a charging and discharging process. Capacitors primarily serve as current buffers, while also providing resonant bypass and suppressing electromagnetic interference. However, as components, capacitors generate heat during operation. Therefore, excessive current and voltage will inevitably increase the heat generated by the capacitor.

[0003] Existing film capacitors have poor heat dissipation effects, and only dissipate heat through resin and packaging shells. In particular, the plastic packaging shell has a poor heat dissipation effect, which often causes the internal film capacitor to heat up severely and be damaged. Therefore, a film capacitor is proposed. Utility Model Content

[0004] (1) Technical problems solved

[0005] In view of the shortcomings of the existing technology, the utility model provides a film capacitor, which solves the problem that the existing film capacitor has poor heat dissipation effect and only dissipates heat from the capacitor through resin and packaging shell, especially the plastic packaging shell has poor heat dissipation effect, which often causes the internal film capacitor to heat up severely and be damaged.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a film capacitor, including a shell and a capacitor body, the shell is arranged outside the capacitor body, a cooling box is installed on the top of the shell, four connecting pipes distributed in a cross shape are installed on the outer wall of the cooling box, a motor is installed on the inner top of the shell and the power output end of the motor extends to the inside of the cooling box and is connected to the fan blades, a middle hole connected to the cooling box and a side hole connected to the connecting pipe are opened on the top of the shell, three positioning rings are installed on the inner wall of the shell, and a number of heat sinks distributed in a ring shape are arranged between adjacent positioning rings.

[0008] As a further preferred embodiment of the present invention, four groups of fixing holes are provided on the outer wall of the housing and located at the positioning ring, and internal threads are provided on the inner walls of the fixing holes and fixing studs are threadedly connected via the internal threads.

[0009] As a further preferred embodiment of the present invention, the end of the fixing stud extends to the interior of the housing and is connected to a rubber pad. The rubber pad has a trumpet-shaped structure and a spherical groove is provided on the outer wall. The end of the rubber pad fits against the outer wall of the capacitor body.

[0010] As a further preferred embodiment of the present invention, guide protrusions are formed on both sides of the outer wall of the heat sink, and the guide protrusions on both sides are alternately distributed, and the guide protrusions are triangular in structure.

[0011] As a further preferred embodiment of the present invention, a guide groove is formed on the outer wall of the heat sink.

[0012] As a further preferred embodiment of the present invention, a filter is provided on the outer wall of the cooling box. (III) Beneficial Effects

[0013] The utility model provides a film capacitor having the following beneficial effects:

[0014] The utility model provides an outer shell outside the capacitor, and a cooling box is provided on the top of the shell. The fan blades inside the cooling box are driven to rotate by a motor. After the fan blades rotate, the external air is brought into the interior and blown into the interior of the shell through the middle hole and the side holes, thereby cooling the interior of the shell, reducing the impact of high temperature on the capacitor during long-term use, and improving its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an external structural diagram of the film capacitor described in the utility model;

[0016] Figure 2 This is a diagram of the internal structure of the film capacitor of the utility model;

[0017] Figure 3 This is a structural diagram of the heat sink described in the utility model.

[0018] In the figure: 1. Cooling box; 2. Connecting pipe; 3. Outer shell; 4. Fixing hole; 5. Fixing stud; 6. Filter; 7. Side hole; 8. Middle hole; 9. Motor; 10. Fan blade; 11. Positioning ring; 12. Capacitor body; 13. Heat sink; 14. Rubber pad; 15. Guide protrusion; 16. Guide groove. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-3, the utility model embodiment provides a technical solution: a film capacitor, including a shell 3 and a capacitor body 12, the shell 3 is sleeved on the outside of the capacitor body 12, a cooling box 1 is installed on the top of the shell 3, four connecting pipes 2 distributed in a cross shape are installed on the outer wall of the cooling box 1, a motor 9 is installed on the inner top of the shell 3, and the power output end of the motor 9 extends to the inside of the cooling box 1 and is connected to the fan blades 10, the motor 9 is connected to the capacitor body 12 by a wire to take power, and after the motor 9 rotates, it drives the fan blades 10 to rotate and draws external air into the shell 3, a middle hole 8 connected to the cooling box 1 and a side hole 7 connected to the connecting pipe 2 are opened on the top of the shell 3, three positioning rings 11 are installed on the inner wall of the shell 3, and a number of heat sinks 13 distributed in an annular shape are arranged between adjacent positioning rings 11, and the ends of the heat sinks 13 are close to the capacitor body 12, which has a heat conduction effect. The heat dissipation air can quickly take out the heat after passing through the heat sink 13, thereby improving the cooling effect.

[0021] As a further improvement, four sets of fixing holes 4 are defined on the outer wall of the housing 3, located at the positioning ring 11. The inner walls of these fixing holes 4 are provided with internal threads, which are threadedly connected to fixing studs 5. By turning the fixing bolts, rubber pads 14 are pushed to secure the capacitor body 12. The ends of the fixing studs 5 extend into the interior of the housing 3 and are connected to rubber pads 14. These rubber pads 14 have a trumpet-shaped structure and a spherical groove defined on their outer wall. The ends of the rubber pads 14 are in contact with the outer wall of the capacitor body 12. These multiple sets of rubber pads 14 support the capacitor body 12, improving installation stability and reducing damage to the capacitor surface.

[0022] As a further improvement, guide protrusions 15 are formed on both sides of the outer wall of the heat sink 13, and the guide protrusions 15 on both sides are alternately distributed and have a triangular structure. Guide grooves 16 are formed on the outer wall of the heat sink 13 to guide the cooling air and improve the heat dissipation effect.

[0023] As a further improvement, a filter screen 6 is provided on the outer wall of the cooling box 1 to filter the air entering the cooling box 1 .

[0024] Working principle: After the motor 9 is started, it brings external air into the shell 3. The cooled air is filtered when passing through the cooling box 1. The filtered cooled air enters the shell 3 through the middle hole 8 and the side hole 7 respectively, and is blown to the end of the capacitor body 12. In the process of passing through the heat sink 13, the heat in the heat sink 13 is taken out. The guide groove 16 and the guide protrusion 15 have a guiding effect on the cooled air and improve the cooling efficiency. The cooled air is finally discharged from the end of the shell.

[0025] The components of the present invention, 1, cooling box; 2, connecting pipe; 3, shell; 4, fixing hole; 5, fixing stud; 6, filter screen; 7, side hole; 8, middle hole; 9, motor; 10, fan blade; 11, positioning ring; 12, capacitor body; 13, heat sink; 14, rubber pad; 15, guide protrusion; 16, guide groove, are all universal standard parts or components known to those skilled in the art. Their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods. The problem solved by the present invention is that the existing film capacitor has poor heat dissipation effect, and only through The heat dissipation of the capacitor is carried out through the resin and the packaging shell, especially the plastic packaging shell has a poor heat dissipation effect, which often leads to the problem that the internal film capacitor is seriously heated and damaged. The utility model combines the above components with each other. The utility model arranges a shell 3 outside the capacitor, and a cooling box 1 is arranged on the top of the shell 3. The fan blades 10 inside the cooling box 1 are driven to rotate by the motor 9. After the fan blades 10 rotate, the external air is brought into the interior and blown to the interior of the shell 3 through the middle hole 8 and the side hole 7, so as to cool the interior of the shell 3, reduce the impact of high temperature on the capacitor during long-term use, and improve its service life.

[0026] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0027] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A film capacitor comprising a housing (3) and a capacitor body (12), characterized in that: The shell (3) is sleeved outside the capacitor body (12); a cooling box (1) is installed on the top of the shell (3); four connecting pipes (2) distributed in a cross shape are installed on the outer wall of the cooling box (1); a motor (9) is installed on the inner top of the shell (3); the power output end of the motor (9) extends to the inside of the cooling box (1) and is connected to a fan blade (10); a middle hole (8) communicating with the cooling box (1) and a side hole (7) communicating with the connecting pipe (2) are opened on the top of the shell (3); three positioning rings (11) are installed on the inner wall of the shell (3); and a plurality of heat sinks (13) distributed in an annular shape are arranged between adjacent positioning rings (11).

2. A film capacitor according to claim 1, characterized in that: Four groups of fixing holes (4) are provided on the outer wall of the housing (3) and located at the positioning ring (11). Internal threads are provided on the inner walls of the fixing holes (4) and are threadedly connected to fixing studs (5) via the internal threads.

3. The film capacitor according to claim 2, wherein: The end of the fixing stud (5) extends to the interior of the housing (3) and is connected to a rubber pad (14). The rubber pad (14) has a trumpet-shaped structure and a spherical groove is provided on the outer wall. The end of the rubber pad (14) is in contact with the outer wall of the capacitor body (12).

4. The film capacitor according to claim 1, wherein: Both sides of the outer wall of the heat sink (13) are respectively formed with flow-guiding protrusions (15), the flow-guiding protrusions (15) on both sides are alternately distributed, and the flow-guiding protrusions (15) are in a triangular structure.

5. The film capacitor according to claim 4, characterized in that: A guide groove (16) is formed on the outer wall of the heat sink (13).

6. The film capacitor according to claim 1, wherein: A filter screen (6) is provided on the outer wall of the cooling box (1).

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