Capacitor explosion-proof end cover and explosion-proof capacitor

Abstract

The capacitor explosion-proof end cover comprises an explosion-proof block, a shell cover and three lead columns, the shell cover comprises a bottom mounting surface and a top ring surface, the bottom mounting surface is located below the top ring surface, the top ring surface is arranged around the bottom mounting surface, an inclined transition surface is arranged between the bottom mounting surface and the top ring surface, and the bottom mounting surface is located below the top ring surface. The explosion-proof block is arranged on the back face of the bottom installation face, the three lead columns are arranged in a triangular mode and arranged on the front face of the bottom installation face, a connecting piece is arranged among the three lead columns, two V-shaped grooves are formed in the surface of the connecting piece and located in the two sides of the middle lead column respectively, and the length of the V-shaped grooves is consistent with the width of the connecting piece. The two V-shaped grooves are additionally arranged on the connecting piece of the leading-out end, so that the connecting piece is easier to break or deform, the bottom mounting surface is reduced by the end cover plate, the bottom mounting surface bears larger pressure under the same pressure, the end cover plate is easier to deform into a circular arc shape when a capacitor fails, and explosion prevention is more sensitive.

Description

Technical Field

[0001] This utility model relates to explosion-proof capacitors, and more particularly to an explosion-proof end cap for a capacitor and an explosion-proof capacitor. Background Technology

[0002] In existing technologies, capacitor explosion protection relies on the internal pressure of the capacitor. When the capacitor overheats, the internal pressure increases rapidly, breaking the connection between the lead posts and the internal copper plates, thus isolating the capacitor from the circuit and preventing overheating damage or explosion. Existing three-phase capacitors, such as those described in patent 201510336196.6, require three terminals at the top. The bottom of these three terminals often requires a single, rigid base that is resistant to deformation and breakage and is integrally mounted on the end cap. Furthermore, the large area of ​​the end cap prevents it from effectively transmitting pressure to the center. This means that when pressure surges inside the capacitor, the end cap cannot deform in time to break the connection between the lead posts and the copper plates, creating a safety hazard. Summary of the Invention

[0003] This utility model provides an explosion-proof end cap for a capacitor and an explosion-proof capacitor to solve the technical problem mentioned in the background art that the capacitor end cap cannot deform in time.

[0004] One technical solution of this utility model is as follows: A capacitor explosion-proof end cap includes: an explosion-proof block, a shell cover, and three lead posts. The shell cover includes a bottom mounting surface and a top annular surface. The bottom mounting surface is located below the top annular surface, and the top annular surface surrounds the bottom mounting surface. An inclined transition surface is provided between the bottom mounting surface and the top annular surface. The explosion-proof block is disposed on the back side of the bottom mounting surface. The three lead posts are arranged in a triangle and disposed on the front side of the bottom mounting surface. A connector is provided between the three lead posts. The surface of the connector is provided with two V-shaped grooves, which are respectively located on both sides of the middle lead post. The length of the V-shaped grooves is the same as the width of the connector.

[0005] Furthermore, the transition surface includes a first inclined transition surface, a horizontal transition surface, and a second inclined transition surface. The top end of the first inclined transition surface is connected to the top annular surface, and the bottom end is connected to one end of the horizontal transition surface. The other end of the horizontal transition surface is connected to the top end of the second inclined transition surface, and the bottom end of the second inclined transition surface is connected to the bottom mounting surface. The inclination angle of the second inclined transition surface is greater than the inclination angle of the first inclined transition surface.

[0006] Furthermore, the diameter of the bottom mounting surface is 70-80% of the outer diameter of the top annular surface.

[0007] Furthermore, the width and depth of the V-groove are proportional to the outer diameter of the top annular surface.

[0008] Furthermore, the three lead posts are arranged in an isosceles triangle, with the distance between the two lead posts being greater than the distance between the middle lead post and its adjacent lead post.

[0009] Furthermore, the explosion-proof block has a vent hole and a reinforcing rib on the side facing away from the bottom mounting surface, and the vent hole penetrates the explosion-proof block.

[0010] Furthermore, a lead bolt is provided in the lead post.

[0011] Another technical solution of this utility model is as follows: an explosion-proof capacitor, including any of the above-mentioned capacitor explosion-proof end caps, capacitor housings and three sets of capacitors, the three sets of capacitors being installed inside the capacitor housings, and the capacitor explosion-proof end caps being disposed on the top of the capacitor housings.

[0012] The beneficial effects of this utility model are as follows: Two V-shaped grooves are added to the connector at the lead end of this utility model. The V-shaped grooves make the connector easier to break or deform. At the same time, the end cover plate is optimized from a flat plate design to an inclined stepped plate design, which reduces the bottom mounting surface. Under the same pressure, the bottom mounting surface can withstand greater pressure. When the capacitor fails, the end cover plate is more likely to be deformed into an arc shape, making the explosion-proof more sensitive and the capacitor performance safer and more reliable. Attached Figure Description

[0013] Figure 1 This is a perspective view of the explosion-proof end cap of the capacitor in this utility model.

[0014] Figure 2 This is a top view of the explosion-proof end cap of the capacitor in this utility model.

[0015] Figure 3 This is a bottom view of the explosion-proof end cap of the capacitor in this utility model. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0017] In one technical solution of this utility model, Figure 1 This is a structural diagram illustrating the specific structure of a capacitor explosion-proof end cap according to this utility model, as shown below. Figure 1 As shown, this utility model includes:

[0018] The device comprises an explosion-proof block 1, a housing cover, and three lead pins 2. The housing cover includes a bottom mounting surface 3 and a top annular surface 4. The bottom mounting surface 3 is located below the top annular surface 4, and the top annular surface 4 surrounds the bottom mounting surface 3. An inclined transition surface 5 is provided between the bottom mounting surface 3 and the top annular surface 4. The explosion-proof block 1 is located on the back of the bottom mounting surface 3. The three lead pins 2 are arranged in a triangle and located on the front of the bottom mounting surface 3. The center of the three lead pins 2 coincides with the center of the bottom mounting surface. A connector 6 is provided between the three lead pins 2. The surface of the connector 6 is provided with two V-shaped grooves 7, which are located on both sides of the middle lead pin 2. The length of the V-shaped grooves 7 is the same as the width of the connector 6.

[0019] In one embodiment of this technical solution, the width and depth of the V-groove 7 are proportional to the outer diameter of the top annular surface 4. For example, when the outer diameter of the top annular surface 4 is 65mm, the width and depth of the V-groove 7 are preferably 3mm and 1.5mm respectively. When the outer diameter of the top annular surface 4 is 136mm, the width and depth of the V-groove 7 are preferably 6mm and 2.5mm respectively.

[0020] In this invention, the "V"-shaped groove design makes the plastic part where the end cap leads are located more prone to breakage or deformation. When the capacitor fails, the end cap is more likely to deform into an arc shape, resulting in more sensitive explosion protection and safer, more reliable capacitor performance. For example, for a φ136 end cap product, without the "V"-shaped groove, the explosion-proof pressure range is 2~4.5 kgf; with the "V"-shaped groove, the explosion-proof pressure range is 1.5~3.8 kgf, making the capacitor more sensitive to explosion-proof effects and ensuring safer, more reliable performance.

[0021] In one embodiment of this technical solution, the transition surface 5 includes a first inclined transition surface 51, a horizontal transition surface 52, and a second inclined transition surface 53. The top end of the first inclined transition surface 51 is connected to the top annular surface 4, and the bottom end is connected to one end of the horizontal transition surface 52. The other end of the horizontal transition surface 52 is connected to the top end of the second inclined transition surface 53, and the bottom end of the second inclined transition surface 53 is connected to the bottom mounting surface 3. The inclination angle of the second inclined transition surface 53 is greater than the inclination angle of the first inclined transition surface 51. Therefore, the transition surface 5 is generally stepped and the overall inclination angle is 5~10°.

[0022] The diameter of the bottom mounting surface 3 is 70-80% of the outer diameter of the top annular surface 4.

[0023] The end cap design has been optimized from a flat plate to a stepped plate design. The inner diameter is 70-80% of the end cap diameter, depending on the design. The larger the outer diameter of the end cap (i.e., the top ring surface 4), the higher the percentage. It forms a stepped shape from the outside to the inside, with an inclination angle of approximately 5-10 degrees, adjusted according to specifications. When the capacitor fails, the internal pressure acts on the end cap (i.e., the bottom mounting surface 3). This stepped plate design reduces the actual area of ​​the internal pressure acting on the capacitor to only 70-80% of the original area. Under the same pressure, the end cap is more easily deformed into an arc shape, making explosion-proof more sensitive and the capacitor performance safer and more reliable. For example, for a φ136 end cap product, without the stepped plate, the explosion-proof pressure range is 2-4.5 kgf; with the stepped plate, the explosion-proof pressure range is 1.6-3.4 kgf, making the capacitor explosion-proof more sensitive and the performance safer and more reliable.

[0024] When both of the above technical points are present, the explosion-proof pressure can be further optimized. For example, for the φ136 end cap product, without the addition of the "V" groove and the stepped plate, the explosion-proof pressure range is 2~4.5kgf. After adding the "V" groove and the stepped plate, the explosion-proof pressure range is 1.2~3kgf. The capacitor explosion-proof is more sensitive, the performance is safer and more reliable, and the market competitiveness of the product can be greatly improved.

[0025] In one embodiment of this technical solution, the three lead posts 2 are arranged in an isosceles triangle, with the distance between the two lead posts 2 being greater than the distance between the middle lead post 2 and its adjacent lead post 2. The arrangement of the three bolt leads of the three-phase AC filter end cover is optimized from an equilateral triangle to an isosceles triangle. When the three-phase AC filter end cover is arranged in an equilateral triangle, due to its application in industrial fields, the external wiring diameter is relatively thick and difficult to bend. Therefore, when wiring, the three external leads present a 120° spiral bend, which is difficult to connect and requires longer wiring, increasing the overall installation cost. After changing to an isosceles triangle, the three external leads can be connected in a straight line, which is easier to operate and can greatly reduce the wiring length, reduce the overall installation cost, and improve market competitiveness.

[0026] In one embodiment of this technical solution, the explosion-proof block 1 has a vent 8 and a reinforcing rib 9 on the side facing away from the bottom mounting surface 3, with the vent 8 penetrating the explosion-proof block 1. The vent 8 reduces material costs, increases heat dissipation capacity, and improves product lifespan stability. When a capacitor fails, the gas generated by the failed capacitor can directly act on the upper and lower parts of the explosion-proof starting block through these holes, activating the explosion-proof mechanism and making it safer and more reliable. The reinforcing rib 9 strengthens the overall strength of the explosion-proof block 1 while increasing the creepage distance between each pair of the three copper foil solder points on the end cap, further enhancing safety and reliability.

[0027] A lead bolt 10 is provided in the lead post 2. The bottom of the lead bolt 10 passes through the explosion-proof block 1 and is connected to the conductive sheet 11. The conductive sheet 11 is connected to the capacitor wiring 12, which is connected to the terminal of the capacitor. The top of the lead bolt 10 is connected to the external wiring of the capacitor, and the bottom is connected to the conductive sheet 11 by means of welding or other methods that can be easily disconnected under pressure, so as to ensure that the circuit is disconnected when the internal pressure of the capacitor increases. Alternatively, explosion-proof rivets can be provided in the explosion-proof block 1 to replace the above connection method. This technical solution is a conventional technical means in this field, so it will not be described in detail here.

[0028] In another technical solution of this utility model, an explosion-proof capacitor is provided, including any of the above-described explosion-proof end caps, a capacitor housing, and three sets of capacitors. The three sets of capacitors are installed inside the capacitor housing. The explosion-proof end caps are located on the top of the capacitor housing. The three sets of capacitors are arranged from top to bottom and connected to conductive plates 11 via capacitor wiring 12, and then connected to lead bolts 10. The beneficial effects and specific implementation methods of this technical solution are the same as those of the above-described technical solutions, and therefore will not be repeated here.

[0029] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A capacitor explosion-proof end cap, characterized in that, include: An explosion-proof block (1), a shell cover, and three lead wire posts (2) are provided. The shell cover includes a bottom mounting surface (3) and a top ring surface (4). The bottom mounting surface (3) is located below the top ring surface (4). The top ring surface (4) surrounds the bottom mounting surface (3). An inclined transition surface (5) is provided between the bottom mounting surface (3) and the top ring surface (4). The explosion-proof block (1) is located on the back of the bottom mounting surface (3). The three lead wire posts (2) are arranged in a triangle and located on the front of the bottom mounting surface (3). A connector (6) is provided between the three lead wire posts (2). The surface of the connector (6) is provided with two V-shaped grooves (7). The two V-shaped grooves (7) are located on both sides of the middle lead wire post (2). The length of the V-shaped grooves (7) is the same as the width of the connector (6).

2. The capacitor explosion-proof end cap as described in claim 1, characterized in that, The transition surface (5) includes a first inclined transition surface (51), a horizontal transition surface (52), and a second inclined transition surface (53). The top end of the first inclined transition surface (51) is connected to the top annular surface (4), and the bottom end is connected to one end of the horizontal transition surface (52). The other end of the horizontal transition surface (52) is connected to the top end of the second inclined transition surface (53). The bottom end of the second inclined transition surface (53) is connected to the bottom mounting surface (3). The inclination angle of the second inclined transition surface (53) is greater than the inclination angle of the first inclined transition surface (51).

3. The capacitor explosion-proof end cap as described in claim 1, characterized in that, The diameter of the bottom mounting surface (3) is 70-80% of the outer diameter of the top annular surface (4).

4. The capacitor explosion-proof end cap as described in claim 1, characterized in that, The width and depth of the V-groove (7) are proportional to the outer diameter of the top annular surface (4).

5. The capacitor explosion-proof end cap as described in claim 1, characterized in that, The three lead posts (2) are arranged in an isosceles triangle, and the distance between the two lead posts (2) is greater than the distance between the middle lead post (2) and its adjacent lead post (2).

6. The capacitor explosion-proof end cap as described in claim 1, characterized in that, The explosion-proof block (1) has a vent (8) and a reinforcing rib (9) on the side opposite to the bottom mounting surface (3), and the vent (8) penetrates the explosion-proof block (1).

7. The capacitor explosion-proof end cap as described in claim 1, characterized in that, The lead post (2) is provided with a lead bolt (10).

8. An explosion-proof capacitor, characterized in that, The capacitor includes the explosion-proof end cap, capacitor housing, and three sets of capacitors as described in any one of claims 1 to 7, wherein the three sets of capacitors are installed inside the capacitor housing, and the explosion-proof end cap is disposed on the top of the capacitor housing.

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