Thin film capacitor

Abstract

The utility model discloses a film capacitor, comprising a first shell, a second shell, a third shell and a core, the first shell, the second shell and the third shell are fixedly connected in sequence in the horizontal direction and jointly enclose to form a filling space, and the core is located in the filling space. Limiting units are arranged between the first shell and the first pin on one side wall of the core and between the third shell and the second pin on the other side wall of the core, and the limiting units are used for relatively fixing the core, the first shell and the third shell in the vertical direction. The utility model provides an anti-theft device. According to the thin-film capacitor provided by the utility model, the core is supported and positioned in the height direction and the width direction of the filling space through the insertion between the second rod body of the insertion rod and the through holes in the first pin and the second pin of the core; in addition, the core is positioned in the length direction of the filling space through the attachment between the first rod body attachment surface of the insertion rod and the outer walls of the first pin and the second pin of the core.

Description

Technical Field

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

[0002] The film capacitor mainly includes a shell, a core, electrode leads and potting glue. The core is placed in the shell, and a filling space is left between the core and the shell. The potting glue is filled in the above space. The potting glue is filled to the bottom of the shell opening to cover the core and expose the electrode pins.

[0003] However, during the potting process, the core may float up and down under the action of the liquid filling material, causing the distance between the core and the surface of the potting material to change, resulting in a decrease in the moisture-proof effect and the appearance size exceeding the manufacturing requirements. Utility Model Content

[0004] In order to solve the technical problems existing in the background technology, the utility model proposes a film capacitor.

[0005] The utility model provides a film capacitor, comprising a first shell, a second shell, a third shell, and a core. The first shell, the second shell, and the third shell are fixedly connected in sequence in the horizontal direction and jointly enclose a filling space. The core is located in the filling space, and there are limit units between the first shell and a first pin on one side wall of the core, and between the third shell and a second pin on the other side wall of the core. The limit units are used to relatively fix the core and the first shell and the third shell in the vertical direction.

[0006] Preferably, the limiting unit comprises a through hole formed on the first pin or the second pin and an insertion rod that can be adapted to be plugged with the through hole in a horizontal direction, wherein the insertion rod extends horizontally from an inner wall of the first shell or the third shell.

[0007] Preferably, the insertion rod includes a first rod body and a second rod body which are fixedly connected in sequence along the horizontal direction, wherein one end of the first rod body close to the second rod body has a limiting surface that can fit with the outer wall of the first pin or the second pin, and the second rod body can be adapted to be plugged into the through hole.

[0008] Preferably, the length of the second rod body is smaller than the depth of the through hole.

[0009] Preferably, the second rod body is a polygonal column.

[0010] Preferably, a first groove for embedding the edge of the first shell is formed on one side of the second shell, and a second groove for embedding the edge of the third shell is formed on the other side of the second shell.

[0011] The film capacitor proposed by the utility model supports and positions the core in the height direction and the width direction of the filling space by the insertion between the second rod body of the insertion rod and the through holes on the first pin and the second pin of the core. In addition, the core is positioned in the length direction of the filling space by the fitting surface of the first rod body of the insertion rod and the outer wall of the first pin and the second pin of the core, thereby ensuring that the filling distance between the outer wall of the core and the inner wall of the shell is constant during assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A cross-sectional schematic diagram of a film capacitor proposed by the utility model;

[0013] Figure 2 for Figure 1 A schematic diagram of the enlarged structure in FIG. DETAILED DESCRIPTION

[0014] Reference Figure 1-2 The utility model proposes a film capacitor, comprising a first shell 1, a second shell 2, a third shell 3, and a core 4. The first shell 1, the second shell 2, and the third shell 3 are fixedly connected in sequence in the horizontal direction and jointly enclose a filling space. The core 4 is located in the filling space, and there are limit units 5 between the first shell 1 and a first pin 41 fixed on one side wall of the core 4, and between the third shell 3 and a second pin 42 fixed on the other side wall of the core 4. The limit units 5 are used to relatively fix the core 4 and the first shell 1 and the third shell 3 in the vertical direction.

[0015] When assembling the film capacitor, the limiting unit 5 is provided to ensure that there is a filling height between the bottom wall of the core 4 and the bottom wall of the filling space, thereby positioning the core 4.

[0016] Specifically, the limiting unit 5 can be a protrusion extending from the first shell 1 or the third shell 3 to support the bottom wall of the core 4, but the protrusion can only support the core 4 in the vertical direction. When the buoyancy between the filling material and the core 4 is greater than the weight of the core 4 itself, the core 4 will float up, and the core 4 cannot be limited in the horizontal direction.

[0017] To solve the above problems, the limiting unit 5 in the present invention specifically includes a through hole 51 opened on the first pin 41 or the second pin 42 and an insertion rod 52 that can be adapted to be plugged into the through hole 51 in the horizontal direction, wherein the insertion rod 52 extends horizontally from the inner wall of the first shell 1 or the third shell 3.

[0018] When assembling the film capacitor, the insertion rod 52 is inserted into the through hole 51. The arrangement of the insertion rod 52 can not only support the core 4 in the vertical direction, but also prevent the core 4 from floating up.

[0019] Furthermore, the insertion rod 52 includes a first rod body 521 and a second rod body 522 which are fixedly connected in sequence along the horizontal direction, wherein one end of the first rod body 521 close to the second rod body 522 has a limiting surface that can fit with the outer wall of the first pin 41 or the second pin 42, and the second rod body 522 can be adapted to be plugged into the through hole 51.

[0020] The length of the second rod 522 is smaller than the depth of the through hole 51 , and the remaining space in the through hole 51 can be used to place a soldering point for soldering and fixing the second rod 522 and the first pin 41 or the second pin 42 .

[0021] If the second rod 522 in the above embodiment is a cylinder, the second rod 522 may swing around the axis of the second rod 522 when the core 4 is assembled. In order to prevent the core 4 from swinging around the axis of the second rod 522 when it is suspended on the second rod 522 through the first pin 41 and the second pin 42, the second rod 522 in the utility model is specifically a polygonal column.

[0022] When assembling the film capacitor, firstly, the through hole 51 on the first pin 41 is plugged with the corresponding second rod 522 on the first shell 1 in the horizontal direction, and the outer wall of the first pin 41 away from the second pin 42 is fitted with the limiting surface on the corresponding first rod 521, and then the third shell 3 and the third shell 3 are spliced ​​and installed. When installing the third shell 3, the corresponding second rod 522 on the third shell 3 is plugged with the through hole 51 on the second pin 42. The plugging between the through hole 51 and the plugging rod 52 can not only align the core 4 and the filling space in the height direction of the filling space, but also can align the core 4 and the filling space. The limiting function can also limit the core 4 in the width direction of the filling space. In addition, since the fitting surface on the corresponding first rod body 521 fits with the outer wall of the second pin 42 on the side away from the first pin 41, the core 4 is limited in the length direction of the filling space, thereby achieving comprehensive limiting between the core 4 and the filling space. At this time, the core 4 is located in the filling space formed by the first shell 1, the third shell 3, and the third shell 3, and the top of the shell is provided with an opening connected to the filling space, and the filling material is poured into the filling space through the opening.

[0023] In the above embodiment, a first groove for embedding the edge of the first shell 1 is formed on one side of the second shell 2 , and a second groove for embedding the edge of the third shell 3 is formed on the other side of the second shell 2 .

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A film capacitor, characterized in that: The invention comprises a first shell (1), a second shell (2), a third shell (3) and a core (4); the first shell (1), the second shell (2) and the third shell (3) are fixedly connected in sequence in the horizontal direction and together enclose a filling space; the core (4) is located in the filling space; and a limiting unit (5) is provided between the first shell (1) and a first pin (41) on one side wall of the core (4) and between the third shell (3) and a second pin (42) on the other side wall of the core (4); the limiting unit (5) is used to relatively fix the core (4) and the first shell (1) and the third shell (3) in the vertical direction.

2. The film capacitor according to claim 1, characterized in that: The limiting unit (5) comprises a through hole (51) formed on the first pin (41) or the second pin (42) and an insertion rod (52) that can be adapted to be plugged into the through hole (51) in a horizontal direction, wherein the insertion rod (52) extends horizontally from the inner wall of the first shell (1) or the third shell (3).

3. The film capacitor according to claim 2, characterized in that: The insertion rod (52) comprises a first rod body (521) and a second rod body (522) which are fixedly connected in sequence along a horizontal direction, wherein one end of the first rod body (521) close to the second rod body (522) has a limiting surface that can be fitted with the outer wall of the first pin (41) or the second pin (42), and the second rod body (522) can be adapted to be plugged into the through hole (51).

4. The film capacitor according to claim 3, characterized in that: The length of the second rod body (522) is smaller than the depth of the through hole (51).

5. The film capacitor according to claim 3, characterized in that: The second rod body (522) is specifically a polygonal column.

6. The film capacitor according to claim 4 or 5, characterized in that: A first groove for embedding the edge of the first shell (1) is provided on one side of the second shell (2), and a second groove for embedding the edge of the third shell (3) is provided on the other side of the second shell (2).

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