A metal thin film capacitor

Abstract

The application relates to a metal film capacitor, which comprises a shell and a metallized core arranged in the shell, the size of the inner side of the shell gradually increases from top to bottom, the cross section shape of the inner side of the shell is wedge-shaped, the lower part of the shell is provided with a supporting convex strip which can be connected with the bottom of the metallized core, sealing glue is filled between the metallized core and the shell, the sealing glue can wrap the metallized core, the side of the metallized core is provided with a pin and the end of the pin extends out of the shell. The application sets the metallized core in the shell, sets the size of the inner part of the shell as gradually increasing from top to bottom, forms a wedge-shaped structure after filling the sealing glue in the shell, improves the connecting strength of the sealing glue, the metallized core and the shell, avoids the capacitor core from being taken out, and improves the service life of the metal film capacitor.

Description

Technical Field

[0001] This application relates to the field of capacitor technology, and in particular to a metal film capacitor. Background Technology

[0002] Capacitors are components that store electrical charge and potential energy. In circuits, they function as energy storage, phase shifters, filters, and resonators, and are widely used in various circuits and electronic devices, such as the shuffling and lifting motors in mahjong machines. Both the shuffling and lifting motors in mahjong machines require a large current to generate rotational torque during startup, necessitating the connection of a starting capacitor. Currently, the capacitors used in commercially available mahjong machines are generally metallized polypropylene film capacitors. Metallized polypropylene film capacitors have advantages such as non-polarity, high insulation resistance, wide frequency response, and very low dielectric loss.

[0003] Metallized polypropylene film capacitors are capacitors made by winding organic plastic film as the dielectric and metallized film as the electrode (excluding laminated structures). Their structure generally includes a shell and a capacitor core. The shell is mostly made of PBT or plastic. The two ends of the capacitor core are gold-plated and soldered with leads or connecting wires. Epoxy resin is also filled into the shell for sealing. However, many existing mahjong machine capacitors have simple shell structures, only fixing the capacitor core with the filled epoxy resin. Because the inner wall of the shell is smooth, once the epoxy resin ages, it affects the stability of the capacitor core and the performance. Therefore, it is necessary to design a metal film capacitor with stable connection. Utility Model Content

[0004] This application provides a metal film capacitor with stable connection.

[0005] The metal film capacitor provided in this application adopts the following technical solution:

[0006] A metal film capacitor includes a housing and a metallized core disposed within the housing. The dimensions of the inner side of the housing gradually increase from top to bottom, and the cross-sectional shape of the inner side of the housing is wedge-shaped. A support protrusion is provided at the bottom of the housing, and the support protrusion can connect with the bottom of the metallized core. A sealant is filled between the metallized core and the housing, and the sealant can wrap the metallized core. Leads are provided on the side of the metallized core, and the ends of the leads extend out of the housing.

[0007] Preferably, the inner side of the housing is provided with a protrusion, the lower inner side of the protrusion is a slope and the slope direction is directed towards the bottom outer side of the housing.

[0008] Preferably, a guide groove is provided on the side of the protrusion near the pin, and the top two sides of the guide groove are provided with rounded corners or chamfers.

[0009] Preferably, a gap is provided between the lower end of the protrusion and the bottom of the housing.

[0010] Preferably, the protrusion and the supporting protrusion are integrally formed with the housing, and the supporting protrusion and the protrusion are located on different sides of the housing.

[0011] Preferably, the pin has a bent portion at its end, and both the pin's end and the bent portion have wiring holes.

[0012] Preferably, the side of the housing is provided with a mounting part, which is perpendicular to the housing and has mounting holes.

[0013] In summary, this application includes at least one of the following beneficial technical effects:

[0014] 1. This application provides a metallized core within the casing, while simultaneously setting the internal dimensions of the casing to gradually increase from top to bottom. After injecting sealant into the casing, a wedge-shaped structure is formed, which improves the connection strength between the sealant, the metallized core, and the casing, prevents the capacitor core from detaching, and extends the service life of the metal film capacitor.

[0015] 2. By setting a protrusion inside the housing and setting a slope on the lower inner side of the protrusion, the shape of the sealant can be restricted by the protrusion structure. After the sealant solidifies, it forms a wedge-shaped structure, which can effectively improve the connection strength between the metallized core, the sealant and the housing. By setting a guide groove on the protrusion and setting rounded or chamfered corners on both sides of the top of the guide groove, it is convenient to insert the metallized core, avoid damaging the pins, and facilitate processing. Attached Figure Description

[0016] Figure 1 This is a perspective view of a metal film capacitor in a preferred embodiment of this application.

[0017] Figure 2 This is an exploded view of the metal film capacitor in a preferred embodiment of this application.

[0018] Figure 3 This is a perspective view of the housing in a preferred embodiment of this application.

[0019] Figure 4 This is a top view of the housing in a preferred embodiment of this application.

[0020] Figure 5 This is a cross-sectional view of the housing in a preferred embodiment of this application.

[0021] Explanation of reference numerals in the attached drawings: 1. Housing; 101. Protrusion; 101a. Guide groove; 102. Mounting part; 2. Metallized core; 201. Pin; 201a. Bending part; 3. Supporting protrusion; 4. Sealant. Detailed Implementation

[0022] The present application will be further described in detail below with reference to the accompanying drawings.

[0023] This application discloses a metal film capacitor.

[0024] Reference Figures 1 to 5 A metal film capacitor includes a housing 1 and a metallized core 2 disposed within the housing 1. A mounting portion 102 is provided on the outer side of the housing 1, perpendicular to the housing 1 and having mounting holes. The inner dimensions of the housing 1 gradually increase from top to bottom, and the cross-sectional shape of the inner side of the housing 1 is wedge-shaped. A supporting protrusion 3 is provided at the lower part of the housing 1, and the supporting protrusion 3 can connect with the bottom of the metallized core 2. A sealant 4 is filled between the metallized core 2 and the housing 1, and the sealant 4 can hold the metallized core in place. 2. Encasing: Since the inner dimensions of the housing 1 gradually increase from top to bottom, the cross-sectional shape of the injected sealant 4 is wedge-shaped with a smaller top and a larger bottom, which has a fixing effect and can prevent the metallized core 2 from separating from the housing 1, thus improving service life. The metallized core 2 has pins 201 on its side, and the ends of the pins 201 extend out of the housing 1. The lower end of the pins 201 can extend to the bottom of the protrusion. The upper end of the pins 201 has a bent part 201a. Both the upper end of the pins 201 and the bent part 201a have wiring holes for easy wiring.

[0025] Reference Figures 2 to 5 The inner side of the housing 1 is provided with a protrusion 101. The lower inner side of the protrusion 101 is a slope, and the slope direction is directed towards the bottom outer side of the housing 1. A guide groove 101a is provided on the side of the protrusion 101 near the pin 201. The top two sides of the guide groove 101a are provided with rounded corners or chamfers. The rounded corners or chamfers can guide the pin 201, making it convenient to put the metallized core 2 into the housing 1.

[0026] Reference Figure 5 Both the protrusion 101 and the supporting protrusion 3 are integrally formed with the housing 1. The supporting protrusion 3 and the protrusion 101 are located on different sides of the housing 1. A gap is provided between the lower end of the protrusion 101 and the bottom of the housing 1. Specifically, in this embodiment, the lower end of the protrusion 101 is connected to the side of the housing 1. If a gap is provided between the lower end of the protrusion 101 and the side wall of the housing 1, after the sealant 4 is injected, a step is formed between the sealant 4 and the lower end of the protrusion 101, which further improves the connection strength and prevents the capacitor core 2 from coming out.

[0027] The implementation principle is as follows: This application sets a metallized core inside the housing, and sets the internal dimensions of the housing to gradually increase from top to bottom. After injecting sealant into the housing, a wedge-shaped structure can be formed, which improves the connection strength between the sealant, the metallized core and the housing, prevents the capacitor core from coming out, and improves the service life of the metal film capacitor.

[0028] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A metal thin-film capacitor, characterized in that: The device includes a housing (1) and a metallized core (2) disposed inside the housing (1). The inner dimensions of the housing (1) gradually increase from top to bottom. The cross-sectional shape of the inner side of the housing (1) is wedge-shaped. A support protrusion (3) is provided at the bottom of the housing (1) and the support protrusion (3) can connect with the bottom of the metallized core (2). A sealant (4) is filled between the metallized core (2) and the housing (1). The sealant (4) can wrap the metallized core (2). A pin (201) is provided on the side of the metallized core (2) and the end of the pin (201) extends out of the housing (1).

2. A metal film capacitor according to claim 1, characterized in that: The inner side of the housing (1) is provided with a protrusion (101), the lower inner side of the protrusion (101) is a slope and the slope is inclined towards the bottom outer side of the housing (1).

3. A metal film capacitor according to claim 2, characterized in that: A guide groove (101a) is provided on the side of the protrusion (101) near the pin (201), and rounded or chamfered corners are provided on both sides of the top of the guide groove (101a).

4. A metal film capacitor according to claim 2, characterized in that: A gap is provided between the lower end of the protrusion (101) and the bottom of the housing (1).

5. A metal film capacitor according to claim 2, characterized in that: The protrusion (101) and the support protrusion (3) are integrally formed with the shell (1), and the support protrusion (3) and the protrusion (101) are located on different sides of the shell (1).

6. A metal film capacitor according to claim 3, characterized in that: The lower end of the pin (201) can extend to the underside of the protrusion (101), and the upper end of the pin (201) is provided with a bent portion (201a). Both the upper end of the pin (201) and the bent portion (201a) are provided with wiring holes.

7. A metal film capacitor according to claim 1, characterized in that: The side of the housing (1) is provided with a mounting part (102), which is perpendicular to the housing (1) and has mounting holes.

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