Cover plate assembly of explosion-proof structure of capacitor

Abstract

The invention discloses a capacitor explosion-proof structure cover plate assembly, and relates to the technical field of capacitors, the cover plate assembly is mainly composed of a tin-plated tinplate cover, a fixing plate, a connecting part and an explosion-proof sheet, the bottom end of the fixing plate is provided with a through hole communicated with the inner side of the fixing plate, and the connecting part comprises an insulator and an iron rivet; through the arrangement of the movable contact part, the bottom end of the iron rivet can accurately penetrate through the separation barrel and make contact with the anti-explosion piece in the combined connection stage of the tinned tin cover and the fixing plate, the assembly stability is guaranteed, when the internal pressure of the aluminum shell is abnormal, a pressure signal triggers the push-pull assembly in the annular air seat to act, the two clamping seats are driven to be away from each other, and the anti-explosion effect is achieved. The separation cylinder is split in advance and is separated from the outer wall of the iron rivet, so that the friction constraint that the iron rivet penetrates through the shrinkage hole is eliminated, an unobstructed movement space is provided for the action that the iron rivet deforms along with the tin-plated tinplate cover and is separated from the explosion-proof sheet, the accurate and timely response of the explosion-proof pressure relief action is ensured, and the reliability and stability of the explosion-proof structure of the capacitor are improved.

Description

Technical Field

[0001] This invention relates to the field of capacitor technology, and more specifically to capacitor explosion-proof structural cover plate assemblies. Background Technology

[0002] In the field of electronic power, capacitors, as key components for storing charge and electrical energy, are widely used in various circuit systems. However, when an abnormal pressure rise occurs inside a capacitor due to faults such as overvoltage, overheating, or dielectric deterioration, if the pressure cannot be released in a timely and effective manner, it may lead to serious safety accidents such as explosions, causing great harm to equipment, personnel, and the surrounding environment. Therefore, the structural design of capacitors with reliable explosion-proof functions is crucial. Among them, the cover plate assembly, as the core component of the capacitor explosion-proof system, directly affects the explosion-proof effect and the overall safety of the capacitor.

[0003] In existing explosion-proof structures for metal-cased capacitors, the cover assembly typically includes components such as an iron cover, rivets, a fixing plate, and an explosion-proof disc. Pressure relief and explosion protection rely on internal pressure driving the deformation of the iron cover and the separation of the rivets and the explosion-proof disc. However, in practical applications, when the deformation of the iron cover causes the rivets to separate from the explosion-proof disc, friction can easily create resistance at the point where the rivets and fixing plate pass through, interfering with the timeliness and smoothness of the separation action. This may result in ineffective pressure release, weakening the reliability of the explosion-proof design. Summary of the Invention

[0004] To solve the above-mentioned technical problems, a capacitor explosion-proof structural cover assembly is provided, which solves the problems existing in the background technology.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a capacitor explosion-proof structure cover assembly, which mainly consists of a tin-plated tinplate cover, a fixing plate, a connecting part, and an explosion-proof sheet;

[0006] The edge of the tinplate cover is engaged with the open end of the top of the aluminum shell.

[0007] The longitudinal section of the fixing plate is concave, and its edge is fixedly connected to the bottom surface of the tin-plated tinplate cover. The bottom end of the fixing plate is provided with a through hole that communicates with its inner side.

[0008] The connecting part includes an insulator fixed in the inner wall of the tin-plated tinplate cover and an iron rivet fixed through the inner wall of the insulator. The top end of the iron rivet is connected to a connecting terminal, and its bottom end penetrates the fixing plate and contacts the explosion-proof sheet. The bottom surface of the fixing plate is also provided with a through hole for the bottom end of the iron rivet to pass through. The through hole is provided with a movable contact part.

[0009] The movable contact part includes a separation cylinder sleeved on the outer wall of the bottom end of the iron rivet, and an annular air seat with an internal cavity located outside the separation cylinder. The outer wall of the annular air seat is fixed to the through hole. The separation cylinder is formed by two semi-annular clamps that fit together. The annular air seat has a built-in push-pull assembly.

[0010] Preferably, the annular air seat is further provided with a pressure relief component, and the fixing plate is provided with an operating component for actively releasing the internal air pressure of the annular air seat by means of the pressure relief component;

[0011] The pressure relief component is a valve stem with a built-in valve core, and the valve stem is fixedly connected to the top of the annular valve seat.

[0012] Preferably, the operating component includes a U-shaped tube mounted inside the fixed plate via a bracket, and one end of the U-shaped tube is internally fitted with a compression column corresponding to the top opening of the air nozzle.

[0013] Preferably, a piston rod is slidably provided at the other end of the U-shaped tube, the bottom end of the piston rod passes through the through hole and is fixed with a piston plate, and the outer wall of the piston plate is slidably connected to the inner wall of the through hole.

[0014] Preferably, the push-pull assembly includes a slide plate slidably disposed within the annular gas seat and a pressure rod vertically fixed to one side of the slide plate. The end of the pressure rod passes through the inner side of the annular gas seat and is fixedly connected to the clamp. A spring is sleeved on the rod body of the pressure rod located within the annular gas seat, and the two ends of the spring are fixedly connected to the inner wall of the slide plate and the annular gas seat, respectively.

[0015] Preferably, the piston rod is fitted with a limiting ring and a second spring on its outer sleeve. The limiting ring is fixedly connected to the inner wall of the U-shaped tube, and the two ends of the second spring are fixedly connected to the limiting ring and the piston plate, respectively.

[0016] Compared with the prior art, the advantages of the present invention are as follows: By setting the movable contact part, during the assembly and connection stage of the tin-plated tinplate cover and the fixing plate, the bottom end of the iron rivet can accurately penetrate the separation cylinder and contact the explosion-proof sheet, ensuring assembly stability. When the internal pressure of the aluminum shell is abnormal, the pressure signal triggers the push-pull component in the annular gas seat to move, driving the two clamps to move away from each other, so that the separation cylinder splits in advance and disengages from the outer wall of the iron rivet, eliminating the frictional constraint of the iron rivet penetrating the compression hole. This provides unobstructed movement space for the iron rivet to move with the deformation of the tin-plated tinplate cover and separate from the explosion-proof sheet, ensuring accurate and timely response of the explosion-proof pressure relief action, and improving the reliability and stability of the capacitor explosion-proof structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal structure of the aluminum shell of the present invention;

[0018] Figure 2 For the present invention Figure 1 Schematic diagram of the structure at point A in the middle;

[0019] Figure 3 For the present invention Figure 2 Schematic diagram of the structure at point B;

[0020] Figure 4 For the present invention Figure 2 Schematic diagram of the structure at point C.

[0021] The numbers on the map are:

[0022] 1. Aluminum casing; 2. Tin-plated tinplate cover; 3. Fixing plate; 4. Insulator; 5. Connecting terminal; 6. Iron rivet; 7. Explosion-proof plate; 8. Through hole; 9. Clamp; 10. Annular gas seat; 11. Sliding plate; 12. Pressure rod; 13. Spring 1; 14. Air nozzle; 15. U-tube; 16. Extrusion column; 17. Piston plate; 18. Piston rod; 19. Limiting ring; 20. Spring 2. Detailed Implementation

[0023] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0024] Reference Figure 1-4 As shown, the capacitor explosion-proof structure cover assembly mainly consists of a tin-plated tinplate cover 2, a fixing plate 3, a connecting part, and an explosion-proof sheet 7.

[0025] The edge of the tin-plated tinplate cover 2 is engaged with the open end of the top of the aluminum shell 1;

[0026] The longitudinal section of the fixing plate 3 is concave, and its edge is fixed to the bottom surface of the tin-plated tinplate cover 2. The bottom end of the fixing plate 3 is provided with a through hole 8 that communicates with its inner side.

[0027] The connecting part includes an insulator 4 fixed in the inner wall of the tin-plated tinplate cover 2 and an iron rivet 6 fixed through the inner wall of the insulator 4. The top of the iron rivet 6 is connected to a connecting terminal 5, and its bottom end penetrates the fixing plate 3 and contacts the explosion-proof sheet 7.

[0028] The explosion-proof plate 7 is connected to the built-in components of the aluminum housing 1 via wires;

[0029] Through the coordinated arrangement of the aluminum shell 1, tin-plated tinplate cover 2, fixing plate 3, insulator 4, connecting terminal 5, iron rivet 6, explosion-proof plate 7, and through hole 8, when the internal pressure of the capacitor rises abnormally, the pressure is transmitted through the through hole 8, causing the tin-plated tinplate cover 2 to deform and bulge, which drives the iron rivet 6 to separate from the explosion-proof plate 7, cutting off the electrical connection and providing a release channel for the internal high voltage. By utilizing the dual effects of mechanical structure action and electrical circuit cut-off, reliable explosion-proof is achieved, ensuring the safe operation of the capacitor and system.

[0030] Furthermore, referring to Figure 1-4 As shown, it is worth noting that the bottom surface of the fixing plate 3 is also provided with a through hole for the bottom end of the iron rivet 6 to pass through, and a movable contact part is provided inside the through hole.

[0031] The movable contact part includes a separation cylinder sleeved on the outer wall of the bottom end of the iron rivet 6, and an annular gas seat 10 with an internal cavity located outside the separation cylinder. The outer wall of the annular gas seat 10 is fixed to the through hole. The separation cylinder is composed of two semi-annular clamps 9 that fit together. The annular gas seat 10 has a push-pull assembly for moving the clamps 9. The explosion-proof sheet 7 is fixedly connected to the annular gas seat 10.

[0032] With the addition of movable contact parts, during the assembly and connection of the tin-plated tinplate cover 2 and the fixing plate 3, the bottom end of the iron rivet 6 can accurately penetrate the separation cylinder and contact the explosion-proof sheet 7, ensuring assembly stability. When the internal pressure of the aluminum shell 1 is abnormal, the pressure signal triggers the push-pull component inside the annular gas seat 10 to move, driving the two clamps 9 to move away from each other, causing the separation cylinder to split in advance and disengage from the outer wall of the iron rivet 6, eliminating the frictional constraint of the iron rivet 6 penetrating the compression hole, and thus providing unobstructed movement space for the iron rivet 6 to deform with the tin-plated tinplate cover 2 and separate from the explosion-proof sheet 7, ensuring accurate and timely response of the explosion-proof pressure relief action, and improving the reliability and stability of the capacitor explosion-proof structure.

[0033] Furthermore, referring to Figure 2-4 As shown, it is worth noting that the annular air seat 10 is also equipped with a pressure relief component, and the fixing plate 3 is equipped with an operating component for actively releasing the internal air pressure of the annular air seat 10 through the pressure relief component.

[0034] The pressure relief component is a valve stem 14 with a built-in valve core, and the valve stem 14 is fixedly connected to the top of the annular valve seat 10.

[0035] The operating component includes a U-shaped tube 15 mounted inside the fixed plate 3 via a bracket, and an extrusion column 16 corresponding to the top opening of the air nozzle 14 is slidably provided at one end of the U-shaped tube 15.

[0036] A piston rod 18 is slidably provided at the other end of the U-shaped tube 15. The bottom end of the piston rod 18 passes through the through hole 8 and is fixed with a piston plate 17. The outer wall of the piston plate 17 is slidably connected to the inner wall of the through hole 8.

[0037] With the setting of the operating parts, pressure relief parts and air nozzle 14, when the internal pressure of the capacitor rises abnormally, high-pressure gas enters through the through hole 8 and acts on the piston plate 17, driving the piston plate 17 to slide upward along the inner wall of the through hole 8. The piston plate 17 pushes the hydraulic medium or gas in the U-shaped tube 15 through the piston rod 18, forcing the extrusion column 16 to move towards the air nozzle 14 and push open the valve core. After the air nozzle 14 is opened, it actively releases the pre-charged air pressure in the annular air seat 10, so that the clamp 9 moves away from the iron rivet 6 under the action of the push-pull assembly.

[0038] Furthermore, referring to Figure 4 As shown, it is worth noting that the push-pull assembly includes a slide plate 11 slidably disposed in the annular gas seat 10 and a pressure rod 12 vertically fixed to one side of the slide plate 11. The end of the pressure rod 12 passes through the inner side of the annular gas seat 10 and is fixedly connected to the clamp 9. The rod body of the pressure rod 12 located in the annular gas seat 10 is fitted with a spring 13. The two ends of the spring 13 are fixedly connected to the slide plate 11 and the inner wall of the annular gas seat 10, respectively.

[0039] When the extrusion column 16 moves toward the air nozzle 14 and pushes open the valve core, releasing the internal air pressure of the annular air seat 10, the pressure on the slide plate 11 decreases, and the slide plate 11 can quickly pull back the clamp 9 under the action of the spring force 13.

[0040] Furthermore, referring to Figure 3 As shown, it is worth noting that the piston rod 18 is fitted with a limiting ring 19 and a second spring 20 on its outer sleeve. The limiting ring 19 is fixedly connected to the inner wall of the U-shaped tube 15, and the two ends of the second spring 20 are fixedly connected to the limiting ring 19 and the piston plate 17, respectively.

[0041] With the setting of spring 20, spring 20 slides up with piston plate 17 to compress and store energy. When the internal pressure of the capacitor is relieved or the explosion-proof action is completed, spring 20 releases elastic potential energy, drives piston plate 17 and piston rod 18 to reset, so that the extrusion column 16 disengages from the air nozzle 14, so that the air nozzle 14 closes the valve core, restores the air pressure balance of the annular air seat 10, and pre-stores reset power for the next explosion-proof action triggered by abnormal pressure, thereby improving the cyclic response capability of the capacitor explosion-proof structure.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made without departing from the spirit and scope of the invention, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. Capacitor explosion-proof structure cover assembly, which mainly consists of tin-plated tinplate cover (2), fixing plate (3), connecting part and explosion-proof sheet (7); The edge of the tin-plated tinplate cover (2) is engaged with the open end of the top of the aluminum shell (1); The longitudinal section of the fixing plate (3) is concave, and its edge is fixed to the bottom surface of the tin-plated tinplate cover (2). The bottom end of the fixing plate (3) is provided with a through hole (8) that communicates with its inner side. The connecting part includes an insulator (4) fixed in the inner wall of the tin-plated tinplate cover (2) and an iron rivet (6) fixed through the inner wall of the insulator (4). The top end of the iron rivet (6) is connected to a connecting terminal (5), and its bottom end penetrates the fixing plate (3) and contacts the explosion-proof sheet (7). The characteristic of this part is that... The bottom surface of the fixing plate (3) is also provided with a through hole for the bottom end of the iron rivet (6) to pass through, and a movable contact part is provided in the through hole; The movable contact part includes a separation cylinder sleeved on the outer wall of the bottom end of the iron rivet (6) and an annular air seat (10) with an internal cavity located outside the separation cylinder. The outer wall of the annular air seat (10) is fixed to the through hole. The separation cylinder is formed by two semi-annular clamps (9) that fit together. The annular air seat (10) has a push-pull assembly built in it.

2. The capacitor explosion-proof structure cover assembly according to claim 1, characterized in that, The annular air seat (10) is also provided with a pressure relief component, and the fixed plate (3) is provided with an operating component for actively releasing the internal air pressure of the annular air seat (10) by means of the pressure relief component; The pressure relief component is a valve stem (14) with a built-in valve core, and the valve stem (14) is fixedly connected to the top of the annular air seat (10).

3. The capacitor explosion-proof structure cover assembly according to claim 2, characterized in that, The operating component includes a U-shaped tube (15) mounted inside the fixed plate (3) via a bracket, and one end of the U-shaped tube (15) is provided with an extrusion column (16) corresponding to the top opening of the air nozzle (14).

4. The capacitor explosion-proof structure cover assembly according to claim 3, characterized in that, A piston rod (18) is slidably provided at the other end of the U-shaped tube (15). The bottom end of the piston rod (18) passes through the through hole (8) and is fixed with a piston plate (17). The outer wall of the piston plate (17) is slidably connected to the inner wall of the through hole (8).

5. The capacitor explosion-proof structure cover assembly according to claim 1, characterized in that, The push-pull assembly includes a slide plate (11) slidably disposed in the annular air seat (10) and a pressure rod (12) vertically fixed to one side of the slide plate (11). The end of the pressure rod (12) passes through the inner side of the annular air seat (10) and is fixedly connected to the clamp (9). The rod body of the pressure rod (12) located in the annular air seat (10) is fitted with a spring (13). The two ends of the spring (13) are fixedly connected to the inner wall of the slide plate (11) and the annular air seat (10), respectively.

6. The capacitor explosion-proof structure cover assembly according to claim 4, characterized in that, The piston rod (18) is fitted with a limiting ring (19) and a second spring (20) on its outer sleeve. The limiting ring (19) is fixedly connected to the inner wall of the U-shaped tube (15), and the two ends of the second spring (20) are fixedly connected to the limiting ring (19) and the piston plate (17) respectively.

Images