Relay explosion-proof pressure relief structure

Abstract

The utility model relates to a high voltage direct current relay, specifically relates to a relay explosion -proof pressure -relief structure. A relay explosion -proof pressure -relief structure, including the insulating cover, the insulating cover has the positioning portion that extends upwards, the positioning portion middle part has the first through -hole that penetrates from top to bottom, be equipped with the explosion -proof block at the positioning portion, the explosion -proof block has the explosion -proof block body that extends into the first through -hole, the explosion -proof block body has a plurality of vertical first recess, the explosion -proof block body still has the second through -hole that penetrates from top to bottom, and the lower extreme of exhaust pipe extends into the second through -hole and is fixed with the explosion -proof block. The utility model integrates the explosion -proof pressure -relief function and the air charge and exhaust in the same position, only need to set up a first through -hole on the insulating cover, can reduce the setting of a hole, fundamentally eliminate the leakage point and the strength weakening factor, and the utility model still has the advantage that is convenient for assembling.

Description

Technical Field

[0001] This utility model relates to a high-voltage DC relay, specifically to a relay explosion-proof pressure relief structure. Background Technology

[0002] Chinese patent application number 202220909352.9 discloses a relay including a pressure relief valve assembly. The pressure relief valve assembly is disposed on a ceramic cover and includes a valve plate. The valve plate is disposed in a pressure relief hole of the ceramic cover. The valve plate and the ceramic cover can be connected by laser welding, brazing, resistance welding, adhesive bonding, etc.

[0003] The above solution has the following drawbacks: it requires setting a pressure relief hole and fixing a valve plate at the pressure relief hole, which will directly increase the number of leakage points in the ceramic cover seal; and in order to fill the ceramic cover of the relay with inert gas, a through hole is usually set on the ceramic cover and an exhaust pipe is fixed at the through hole, which will lead to a decrease in structural strength due to the setting of pressure relief holes and through holes on the edge of the ceramic cover. Utility Model Content

[0004] The purpose of this invention is to provide a relay explosion-proof pressure relief structure that can reduce leakage points and has a better explosion-proof pressure relief effect.

[0005] To achieve the above objectives, this utility model employs a relay explosion-proof pressure relief structure, including an insulating cover. The insulating cover has an upwardly extending positioning part, and the positioning part has a first through hole penetrating vertically in the middle. An explosion-proof block is provided at the positioning part. The explosion-proof block has an explosion-proof block body extending into the first through hole. The explosion-proof block body has several vertically extending first grooves. The explosion-proof block body also has a second through hole penetrating vertically. The lower end of the exhaust pipe extends into the second through hole and is fixed to the explosion-proof block.

[0006] The first through hole serves as both a positioning hole for the explosion-proof block and, together with the second through hole, a pressure relief channel, avoiding the need for additional openings in the insulating cover and reducing leakage points. The vertically positioned first groove directly reduces the structural strength of the explosion-proof block. When the explosion-proof block needs to be damaged or cracked, high-pressure gas can quickly leak out along the first groove, reducing the risk of explosion. The pressure relief direction is fixed by the positioning part, preventing airflow from impacting internal components, resulting in good explosion-proof and pressure relief effects. The explosion-proof block and exhaust pipe can be pre-assembled before assembling the explosion-proof block and insulating cover, making assembly more convenient.

[0007] Preferably, a first chamber is formed above the insulating cover, and the first chamber is filled with a first sealant. The junction between the explosion-proof block body and the positioning part is in contact with the sealant block formed after the first sealant has solidified. Sealing and fixing are achieved through sealant application, making the fixing of the explosion-proof block more convenient.

[0008] Preferably, the explosion-proof block body is clearance-fitted with the wall of the first through hole. This arrangement facilitates the entire explosion-proof block disengaging from the first through hole, thus enabling explosion-proof pressure relief.

[0009] Preferably, a second groove is provided on the outer circumferential wall of the upper end of the explosion-proof block, and the adhesive block formed after the first sealant solidifies extends into the second groove. The second groove can improve the positioning and fixing effect of the explosion-proof block; at the same time, the adhesive block does not have a high restraining effect on the explosion-proof block. Under high pressure, the part of the adhesive block located in the second groove can be deformed by force, and the explosion-proof block can be smoothly disengaged from the positioning part to achieve pressure relief.

[0010] Preferably, the second groove extends upward through the explosion-proof block. During potting and sealing, the first sealant can flow upward along the through opening of the second groove and fill the entire second groove, forming a more complete and continuous contact surface between the sealant and the explosion-proof block. This improves sealing reliability and allows the sealant to be more easily sheared or peeled off along the through direction under high pressure, ensuring that the explosion-proof block can smoothly detach from the positioning part and achieve rapid pressure relief.

[0011] Preferably, the circumferential wall of the second groove gradually approaches the axis of the first through hole from bottom to top. When the explosion-proof block is pushed upward by the internal high pressure, the contact area between the rubber block and the conical groove wall gradually decreases, and the constraint force of the rubber on the explosion-proof block decreases rapidly. This provides sufficient positioning strength under normal conditions and significantly reduces the resistance to the explosion-proof block's release during pressure relief, ensuring that high-pressure gas can be released in a timely and smooth manner, thereby improving the explosion-proof response speed and reliability.

[0012] Preferably, the explosion-proof block has an upwardly extending annular portion, and a second chamber is formed between the annular portion and the exhaust pipe and filled with a second sealant. This arrangement facilitates sealing at the exhaust pipe and also enables the connection and fixation between the exhaust pipe and the explosion-proof block.

[0013] Preferably, the annular extension has a lateral opening to allow communication between the first chamber and the second chamber. This makes potting, sealing, and positioning more convenient, requiring only a single potting operation.

[0014] Preferably, the upper end of the explosion-proof block body has an outer ring extending outward in a circumferential direction, and the outer ring is supported on the upper side of the positioning part. This arrangement achieves the lower limit position of the explosion-proof block, facilitating its assembly.

[0015] Preferably, the second through-hole wall has an inner ring extending circumferentially inward, and the exhaust pipe is supported on the inner ring. This arrangement prevents the exhaust pipe from excessively extending into the first through-hole.

[0016] This invention integrates the explosion-proof pressure relief function and the inflation and deflation function in the same location. Only one through hole needs to be set on the insulating cover, which can reduce the number of holes and fundamentally eliminate leakage points and factors that weaken strength. At the same time, this invention also has the advantage of being easy to assemble. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a relay according to this utility model.

[0018] Figure 2 This is a schematic diagram of the explosion-proof pressure relief structure on the insulating cover of this utility model.

[0019] Figure 3 This is a cross-sectional view of the explosion-proof block of this utility model. Detailed Implementation

[0020] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0021] Depend on Figures 1 to 3 As shown, this embodiment discloses a relay explosion-proof pressure relief structure, including an insulating cover 1. The insulating cover 1 has an upwardly extending positioning part 11, and the positioning part has a first through hole 10 extending vertically through the middle. An explosion-proof block 2 is provided at the positioning part 11, and the explosion-proof block 2 has a second through hole 20 extending vertically through the middle. The lower end of the exhaust pipe 3 extends into the second through hole and is fixed to the explosion-proof block 2. Figure 1 As shown, the relay in this embodiment has an outer shell 9, which is fitted over the insulating cover 1. The plane of the upper end face of the outer shell 9 is located above the plane of the upper end face of the insulating cover 1 to form a first chamber 100. The first chamber 100 is filled with a first sealant. The explosion-proof block 2 and the positioning part 11 are in contact with the sealant block formed after the first sealant has solidified. The lower end of the second through hole 20 has an inner ring 201 extending inward in a circumferential direction, and the exhaust pipe 3 is supported on the upper side of the inner ring 201.

[0022] The explosion-proof block 2 has an explosion-proof block body 21 that extends downward to enter the first through hole 10. The explosion-proof block body 21 is in clearance fit with the wall of the first through hole 10. The explosion-proof block body 21 has four first grooves 211 with arc-shaped cross sections that extend vertically. The four first grooves 211 are arranged in a ring with the second through hole as the center and are evenly spaced.

[0023] The explosion-proof block body 21 has an outer ring portion 22 extending outward in a circumferential direction at its upper end, and the outer ring portion 22 is supported on the upper side of the positioning portion 11. The outer ring portion 22 has an upwardly extending annular extension portion 23, and a second chamber 31 is formed between the annular extension portion 23 and the exhaust pipe 3 and filled with a second sealant. In this embodiment, the first sealant and the second sealant are the same.

[0024] The annular extension 23 of the explosion-proof block 2 has a second groove 231 on its upper circumferential outer wall. The adhesive block formed after the first sealant solidifies extends into the second groove 231, which extends upward through the explosion-proof block. The second groove 231 is annular, and its circumferential wall gradually approaches the axis of the first through hole 10 from bottom to top. The annular extension 23 has a lateral opening 230 to allow communication between the first chamber 100 and the second chamber 31.

[0025] This embodiment integrates the explosion-proof pressure relief function and the inflation / deflation function in the same location. Only one first through hole needs to be set on the insulating cover, which can reduce the number of holes and fundamentally eliminate leakage points and factors that weaken strength. At the same time, this utility model also has the advantage of being easy to assemble.

Claims

1. A relay explosion-proof pressure relief structure, comprising an insulating cover, characterized in that: The insulating cover has an upwardly extending positioning part, the positioning part has a first through hole that runs vertically through the middle, an explosion-proof block is provided at the positioning part, the explosion-proof block has an explosion-proof block body that extends into the first through hole, the explosion-proof block body has several vertically extending first grooves, the explosion-proof block body also has a second through hole that runs vertically through the middle, the lower end of the exhaust pipe extends into the second through hole and is fixed to the explosion-proof block.

2. The explosion-proof pressure relief structure for a relay according to claim 1, characterized in that: A first chamber is formed above the insulating cover, and the first chamber is filled with a first sealant. The explosion-proof block body and the positioning part are in contact with the sealant block formed after the first sealant has solidified.

3. The explosion-proof pressure relief structure for the relay according to claim 2, characterized in that: The explosion-proof block body is fitted with the wall of the first through hole with a clearance.

4. The explosion-proof pressure relief structure for a relay according to claim 2 or 3, characterized in that: The explosion-proof block has a second groove on its upper circumferential outer wall, and the adhesive block formed after the first sealant solidifies extends into the second groove.

5. The explosion-proof pressure relief structure for a relay according to claim 4, characterized in that: The second groove extends upward through the explosion-proof block.

6. The explosion-proof pressure relief structure for a relay according to claim 5, characterized in that: The circumferential wall of the second groove gradually approaches the axis of the first through hole from bottom to top.

7. The explosion-proof pressure relief structure for a relay according to claim 1 or 2, characterized in that: The explosion-proof block has an upwardly extending annular extension, and a second chamber is formed between the annular extension and the exhaust pipe and filled with a second sealant.

8. The explosion-proof pressure relief structure for a relay according to claim 7, characterized in that: The annular extension has a lateral opening to allow communication between the first chamber and the second chamber.

9. The explosion-proof pressure relief structure for a relay according to claim 1 or 2, characterized in that: The explosion-proof block body has an outer ring extending outward in a circumferential direction at its upper end, and the outer ring is supported on the upper side of the positioning part.

10. The explosion-proof pressure relief structure for a relay according to claim 1, characterized in that: The second through hole wall has an inner ring portion extending circumferentially inward, and the exhaust pipe is supported on the inner ring portion.

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