High-voltage explosion-proof metallized film capacitor

Abstract

The invention discloses a high-voltage explosion-proof metallized film capacitor which comprises an outer shell, a capacitor core is arranged in the outer shell and electrically connected with a first wire, the top of the outer shell is in threaded connection with a sealing cover, the outer wall of the sealing cover is fixedly connected with pins, and the pins are fixedly connected with a second wire. The sealing cover is provided with a circuit breaking cavity, and one end of the first wire and one end of the second wire extend into the circuit breaking cavity. High-pressure gas generated in the outer shell firstly enters the pressure relief cover, then pushes the second piston to move towards the side away from the pressure relief cover, and pushes the metal conduction piece to move in the circuit breaking cavity through the second piston rod until the metal conduction piece is electrically disconnected with the first wire and the second wire. At the moment, the first wire and the second wire form an open circuit and stop working, pressure is released through the pressure release part, the capacitor is prevented from being still powered on and running in the pressure release process, the explosion risk is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of capacitors, and in particular relates to a high-voltage explosion-proof metallized film capacitor. Background Art

[0002] Film capacitors are an electrical appliance with a relatively high frequency of use. They are widely used in the interconnection of analog signals and other power supplies. Film capacitors have many excellent characteristics and are a very excellent capacitor product. They are used in many household appliances and have a wide range of applications.

[0003] During use, metallized film capacitors are at risk of explosion due to excessive internal pressure due to high temperature, overcharging, etc. An exhaust valve is usually installed on the outer casing, but during the exhaust process, current will still pass through the metallized film capacitor, which will continue to apply load to the metallized film capacitor and affect its service life. Summary of the Invention

[0004] The present invention aims to solve the problems in the prior art and proposes the following technical solutions:

[0005] A high-voltage explosion-proof metallized film capacitor, comprising an outer shell, a capacitor core disposed within the outer shell, the capacitor core being electrically connected to a first conductor, a sealing cover being threadedly connected to the top of the outer shell, a pin being fixedly connected to an outer wall of the sealing cover, the pin being fixedly connected to a second conductor, a disconnecting cavity being defined in the sealing cover, and one end of each of the first and second conductors extending into the disconnecting cavity;

[0006] An explosion-proof mechanism, comprising a pressure relief cover fixed to the inner ring of the sealing cover, wherein a pressure relief portion for discharging the internal pressure of the outer shell is provided inside the pressure relief cover, and a piston cylinder 2 provided inside the circuit breaker chamber is fixedly connected to both sides of the pressure relief cover;

[0007] A circuit breaker protection mechanism includes a metal conductive sheet arranged between wire one and wire two, a rebound portion being provided on one side of the metal conductive sheet and a piston rod two being fixedly connected on the other side, the piston rod two being fixedly connected to a piston two that movably cooperates with a piston cylinder two, and the high-pressure gas generated inside the outer shell pushes the metal conductive sheet to move through the piston two and the piston rod two, thereby disconnecting the electrical connection with the wire one and the wire two, thereby forming a circuit breaker.

[0008] As a preferred embodiment of the above technical solution, the capacitor core is formed by winding a dielectric film and a metal film, and a fixing agent is filled between the capacitor core and the inner wall of the outer shell.

[0009] As a preferred embodiment of the above technical solution, the pressure relief part includes a partition plate fixed inside the pressure relief cover, the partition plate is located above the piston cylinder 2, and the inner ring of the partition plate is fixedly sleeved with the piston cylinder 1, the interior of the piston cylinder 1 is provided with a piston member, and the side wall of the piston cylinder 1 is provided with a transfer hole located above the partition plate, the piston member is fixedly connected to the pressure relief plate, and the pressure relief cover is provided with a pressure relief hole on one side outside the sealing cover, and the pressure relief hole is adapted to the size of the pressure relief plate.

[0010] As a preferred embodiment of the above technical solution, the piston member includes a piston 1 movably mounted inside a piston cylinder 1, one side of the piston 1 is fixedly connected to a piston rod 1, and the end of the piston rod 1 away from the piston 1 passes through the piston cylinder 1 and is fixedly connected to the pressure relief plate.

[0011] As a preferred embodiment of the above technical solution, the outer ring of the piston rod 1 is fixedly sleeved with a baffle, the side wall of the baffle is fixedly connected with a guide slide rod, the guide slide rod is slidingly connected to the inner wall of the pressure relief cover, and an elastic part 1 is fixedly connected between the piston cylinder 1 and the baffle.

[0012] As a preferred embodiment of the above technical solution, a retaining ring is fixedly connected to a side of the pressure relief hole close to the inside of the pressure relief cover.

[0013] As a preferred embodiment of the above technical solution, the rebound portion includes a second elastic member, one end of which is fixedly connected to the circuit breaker cavity, and the other end of which is fixedly connected to the metal conductive sheet.

[0014] As a preferred embodiment of the above technical solution, the side of the metal conductive plate away from the second piston rod is fixedly connected to a sleeve rod, the end of the sleeve rod away from the metal conductive plate is movably sleeved with a sleeve, and the end of the sleeve away from the sleeve rod is fixed on the side wall of the circuit breaker chamber.

[0015] The beneficial effects of the present invention are:

[0016] 1. The high-pressure gas generated inside the outer shell of the present invention will first enter the interior of the pressure relief cover, and then push the second piston to move away from the pressure relief cover. The second piston rod will push the metal conductive plate to move inside the circuit breaker chamber until it is electrically disconnected from the first and second wires. At this time, the first and second wires will be disconnected and stop working. The pressure is released through the pressure relief part, avoiding the capacitor from being energized and operating during the pressure relief process, reducing the risk of explosion and increasing the service life.

[0017] 2. The high-pressure gas of the present invention will be discharged from the body through the pressure relief part. When the pressure inside the outer shell returns to normal, the metal conductive sheet will be pushed back to its original position through the rebound part, so that the first wire and the second wire form a loop to ensure the normal operation of the capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1Shown is a schematic structural diagram of a high-voltage explosion-proof metallized film capacitor in an embodiment;

[0019] Figure 2 Shown is a schematic structural diagram of the outer shell in the embodiment;

[0020] Figure 3 Shown is a schematic structural diagram of a pressure relief cover in an embodiment;

[0021] Figure 4 Shown is Figure 2 A schematic diagram of the structure at point A in the figure.

[0022] Description of reference numerals:

[0023] 11. Outer shell; 12. Capacitor core; 13. Wire 1; 14. Sealing cover; 141. Circuit breaker chamber; 15. Pin; 16. Wire 2; 20. Explosion-proof mechanism; 21. Pressure relief cover; 211. Pressure relief hole; 22. Partition plate; 23. Piston cylinder 1; 231. Transfer hole; 24. Piston 1; 25. Piston rod 1; 26. Pressure relief plate; 27. Baffle; 28. Guide slide; 29. ​​Elastic part 1; 210. Piston cylinder 2; 30. Circuit breaker mechanism; 31. Metal conductive plate; 32. Piston rod 2; 33. Piston 2; 34. Sleeve rod; 35. Sleeve; 36. Elastic part 2. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0025] Example

[0026] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the high-voltage explosion-proof metallized film capacitor includes an outer shell 11, an explosion-proof mechanism 20 and a circuit breaker protection mechanism 30. The outer shell 11 is provided with a capacitor core 12, the capacitor core 12 is electrically connected to a wire 13, and the top of the outer shell 11 is threadedly connected to a sealing cover 14, the outer wall of the sealing cover 14 is fixedly connected to a pin 15, the pin 15 is fixedly connected to a wire 2 16, the sealing cover 14 is provided with a circuit breaker cavity 141, one end of the wire 13 and the wire 2 16 are extended to the inside of the circuit breaker cavity 141, and the explosion-proof mechanism 20 includes a fixed A pressure relief cover 21 is fixed in the inner ring of the sealing cover 14, and a pressure relief portion for discharging the internal pressure of the outer shell 11 is provided inside the pressure relief cover 21, and both sides of the pressure relief cover 21 are fixedly connected to a piston cylinder 2 210 arranged inside the circuit breaker chamber 141. The circuit breaker protection mechanism 30 includes a metal conductive sheet 31 arranged between the wire 13 and the wire 2 16, and a rebound portion is provided on one side of the metal conductive sheet 31, and a piston rod 2 32 is fixedly connected to the other side. The piston rod 2 32 is fixedly connected to a piston 2 33 that movably cooperates with the piston cylinder 210.

[0027] It should be noted that the two groups of wire 1 13 , pin 15 and wire 2 16 are respectively the positive and negative electrodes of the capacitor, and the metal conductive sheet 31 is in a “0” shape, and its material is but not limited to copper.

[0028] Specifically, the high-pressure gas generated inside the outer shell 11 will first enter the interior of the pressure relief cover 21, and then push the piston 2 33 to move to the side away from the pressure relief cover 21. The piston rod 2 32 will push the metal conductive sheet 31 to move inside the circuit breaker chamber 141 until it is electrically disconnected from the wire 13 and the wire 2 16. At this time, the wire 1 13 and the wire 2 16 will form a circuit and stop working. At the same time, the high-pressure gas will be discharged from the body through the pressure relief part. When the pressure inside the outer shell 11 returns to the normal value, the metal conductive sheet 31 will be pushed back to its original position through the rebound part, so that the wire 1 13 and the wire 2 16 form a loop, ensuring the normal operation of the capacitor.

[0029] like Figure 1 and Figure 2 As shown, the capacitor core 12 is formed by winding a dielectric film and a metal film, and a fixing agent is filled between the capacitor core 12 and the inner wall of the outer shell 11.

[0030] It should be noted that a high square resistance buffer zone is set at the edge of the capacitor core 12, and the square resistance value increases gradually from 5Ω / □ in the center to 50Ω / □ at the edge to suppress discharge diffusion. The electrode partition adopts a honeycomb hollow structure to reduce the risk of local overheating.

[0031] like Figure 2 and Figure 3As shown, the pressure relief part includes a partition plate 22 fixed inside the pressure relief cover 21, the partition plate 22 is located above the piston cylinder 210, and the inner ring of the partition plate 22 is fixedly sleeved with a piston cylinder 23, the interior of the piston cylinder 23 is provided with a piston member, and the side wall of the piston cylinder 23 is provided with a transfer hole 231 located above the partition plate 22, the piston member is fixedly connected to the pressure relief plate 26, and the pressure relief cover 21 is provided with a pressure relief hole 211 on one side outside the sealing cover 14, and the pressure relief hole 211 is adapted to the size of the pressure relief plate 26.

[0032] It should be noted that the piston member includes a piston 24 movably mounted inside a piston cylinder 23, a piston rod 25 is fixedly connected to one side of the piston 24, and an end of the piston rod 25 away from the piston 24 passes through the piston cylinder 23 and is fixedly connected to a pressure relief plate 26.

[0033] Specifically, the high-pressure gas inside the outer shell 11 will first enter the interior from the bottom opening of the pressure relief cover 21. At this time, the piston 1 24 is located below the transfer hole 231. At this time, the high-pressure gas will enter the interior of the piston cylinder 210, pushing the piston 2 33 and the piston rod 2 32 to move, and then pushing the metal conductive plate 31 to separate from between the wire 1 13 and the wire 2 16, so that the wire 1 13 and the wire 2 16 are disconnected. However, the high-pressure gas still cannot be released. At this time, the piston 1 24 will be pushed to move upward, and the pressure relief plate 26 will be pushed to separate from the pressure relief hole 211 through the piston rod 1 25. At the same time, the high-pressure gas will enter the cavity above the partition plate 22 through the transfer hole 231, and finally be discharged from the body through the pressure relief hole 211.

[0034] like Figure 3 As shown, the outer ring of the piston rod 25 is fixedly sleeved with a baffle 27, the side wall of the baffle 27 is fixedly connected with a guide slide 28, the guide slide 28 is slidably connected to the inner wall of the pressure relief cover 21, and an elastic member 29 is fixedly connected between the piston cylinder 23 and the baffle 27.

[0035] Specifically, the elastic member 29 adopts but is not limited to a spring. Through the force of the elastic member 29, after the high-pressure gas is discharged, the pressure relief plate 26 and the piston 24 can be pulled back to their original positions, so that the interior of the outer shell 11, the sealing cover 14 and the pressure relief cover 21 can be re-formed into a closed chamber.

[0036] like Figure 3 As shown, a retaining ring is fixedly connected to one side of the pressure relief hole 211 close to the interior of the pressure relief cover 21 .

[0037] Specifically, the provision of the retaining ring can prevent the pressure relief plate 26 from completely entering the interior of the pressure relief cover 21 .

[0038] like Figure 2 and Figure 4As shown, the rebound portion includes a second elastic member 36 , one end of the second elastic member 36 is fixedly connected to the circuit breaker cavity 141 , and the other end is fixedly connected to the metal conductive sheet 31 .

[0039] Specifically, the second elastic member 36 adopts but is not limited to a spring. When the high-pressure gas is completely discharged, the second elastic member 36 can push the metal conductive sheet 31 back to its original position to contact the first wire 13 and the second wire 16, so that the capacitor resumes normal operation.

[0040] like Figure 4 As shown, the side of the metal conductive sheet 31 away from the piston rod 2 32 is fixedly connected to a sleeve rod 34, and the end of the sleeve rod 34 away from the metal conductive sheet 31 is movably sleeved with a sleeve 35, and the end of the sleeve 35 away from the sleeve rod 34 is fixed to the side wall of the circuit breaker chamber 141.

[0041] Specifically, through the active cooperation between the sleeve rod 34 and the sleeve 35 , the metal conductive sheet 31 can only move horizontally and linearly during the movement process, thereby increasing stability.

[0042] Working principle: When the internal pressure of the capacitor is too high, the high-pressure gas inside the outer shell 11 will first enter the interior from the bottom opening of the pressure relief cover 21. At this time, the piston 1 24 is located below the transfer hole 231. At this time, the high-pressure gas will enter the interior of the piston cylinder 210, pushing the piston 2 33 and the piston rod 2 32 to move, and then pushing the metal conductive sheet 31 out of between the wire 1 13 and the wire 2 16, so that the wire 1 13 and the wire 2 16 are disconnected, and the capacitor stops working. However, the high-pressure gas still cannot be released, and at this time it will push the piston 1 24 to move upward, through the piston Rod 1 25 pushes the pressure relief plate 26 to separate from the pressure relief hole 211. At the same time, the high-pressure gas will enter the cavity above the partition plate 22 through the transfer hole 231, and finally be discharged from the body through the pressure relief hole 211. After the high-pressure gas is discharged, the force of the elastic member 1 29 can pull the pressure relief plate 26 and the piston 1 24 back to their original positions, so that the interior of the outer shell 11, the sealing cover 14 and the pressure relief cover 21 are re-formed into a closed chamber. At the same time, the elastic member 2 36 can push the metal conductive sheet 31 back to its original position to contact the wire 1 13 and the wire 2 16, so that the capacitor resumes normal operation.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. High voltage explosion-proof metallized film capacitor, characterized by: include: An outer shell (11), wherein a capacitor core (12) is provided inside the outer shell (11), the capacitor core (12) is electrically connected to a first conductor (13), and a sealing cover (14) is threadedly connected to the top of the outer shell (11), an outer wall of the sealing cover (14) is fixedly connected to a pin (15), and the pin (15) is fixedly connected to a second conductor (16), and the sealing cover (14) is provided with a circuit breaker cavity (141), and one end of each of the first conductor (13) and the second conductor (16) extends into the interior of the circuit breaker cavity (141); An explosion-proof mechanism (20), the explosion-proof mechanism (20) comprising a pressure relief cover (21) fixed in the inner ring of the sealing cover (14), a pressure relief portion for discharging the internal pressure of the outer shell (11) being provided inside the pressure relief cover (21), and a second piston cylinder (210) provided inside the circuit breaker chamber (141) being fixedly connected to both sides of the pressure relief cover (21); A circuit breaker protection mechanism (30) includes a metal conductive sheet (31) arranged between a first conductor (13) and a second conductor (16), one side of the metal conductive sheet (31) is provided with a rebound portion, and the other side is fixedly connected to a second piston rod (32), the second piston rod (32) is fixedly connected to a second piston (33) that movably cooperates with a second piston cylinder (210), and the high-pressure gas generated inside the outer shell (11) pushes the metal conductive sheet (31) to move through the second piston (33) and the second piston rod (32), thereby disconnecting the metal conductive sheet (31) from the electrical connection with the first conductor (13) and the second conductor (16), thereby forming a circuit breaker.

2. The high-voltage explosion-proof metallized film capacitor according to claim 1, characterized in that: The capacitor core (12) is formed by winding a dielectric film and a metal film, and a fixing agent is filled between the capacitor core (12) and the inner wall of the outer shell (11).

3. The high-voltage explosion-proof metallized film capacitor according to claim 1, characterized in that: The pressure relief portion includes a partition plate (22) fixed inside the pressure relief cover (21), the partition plate (22) is located above the second piston cylinder (210), and the inner ring of the partition plate (22) is fixedly sleeved with the first piston cylinder (23), the interior of the first piston cylinder (23) is provided with a piston member, and the side wall of the first piston cylinder (23) is provided with a transfer hole (231) located above the partition plate (22), the piston member is fixedly connected to the pressure relief plate (26), and the pressure relief cover (21) is provided with a pressure relief hole (211) on one side outside the sealing cover (14), and the pressure relief hole (211) is adapted to the size of the pressure relief plate (26).

4. The high-voltage explosion-proof metallized film capacitor according to claim 3, characterized in that: The piston member comprises a piston (24) movably sleeved inside a piston cylinder (23), one side of the piston (24) is fixedly connected to a piston rod (25), and an end of the piston rod (25) away from the piston (24) passes through the piston cylinder (23) and is fixedly connected to a pressure relief plate (26).

5. The high-voltage explosion-proof metallized film capacitor according to claim 4, characterized in that: The outer ring of the piston rod (25) is fixedly sleeved with a baffle (27), the side wall of the baffle (27) is fixedly connected with a guide slide (28), the guide slide (28) is slidably connected to the inner wall of the pressure relief cover (21), and an elastic member (29) is fixedly connected between the piston cylinder (23) and the baffle (27).

6. The high-voltage explosion-proof metallized film capacitor according to claim 4, characterized in that: A retaining ring is fixedly connected to one side of the pressure relief hole (211) close to the interior of the pressure relief cover (21).

7. The high-voltage explosion-proof metallized film capacitor according to claim 1, characterized in that: The rebound portion includes a second elastic member (36), one end of which is fixedly connected to the circuit breaker cavity (141), and the other end of which is fixedly connected to the metal conductive sheet (31).

8. The high-voltage explosion-proof metallized film capacitor according to claim 7, characterized in that: The side of the metal conductive sheet (31) away from the second piston rod (32) is fixedly connected to a sleeve rod (34), and the end of the sleeve rod (34) away from the metal conductive sheet (31) is movably sleeved with a sleeve (35), and the end of the sleeve (35) away from the sleeve rod (34) is fixed to the side wall of the circuit breaker chamber (141).

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