A low-voltage capacitor for power electronic equipment

Abstract

This invention discloses a low-voltage capacitor specifically for power electronic equipment, relating to the field of power capacitor technology. The low-voltage capacitor includes a fixed housing, inside which a low-voltage capacitor is fixedly connected. A detachable terminal is movably connected to the top of the low-voltage capacitor. The fixed housing has a through hole for a grounding interface to pass through, which is movably connected to the fixed housing. This low-voltage capacitor utilizes the expansion of explosive gas to push two sealing plates outwards, and a limiting block locks the position of the sealing plates, thus fixing their position and sealing the interior of the fixed housing. This prevents continuous contact between the high-temperature combustion and oxygen, rapidly interrupting combustion and preventing excessive burning. Simultaneously, a separating plate pushes open the detachable terminal, disconnecting the external circuit from the low-voltage capacitor and preventing damage to the external circuit.

Description

Technical Field

[0001] This invention relates to the field of power capacitor technology, specifically a low-voltage capacitor for power electronic equipment. Background Technology

[0002] A low-voltage capacitor is an electronic component used to store electrical energy, regulate voltage, or compensate for power factor. It is widely used in power systems and electronic equipment to improve energy efficiency. It typically consists of metal plates and an insulating dielectric, and is characterized by its small size and long lifespan. Patent application number CN201010203929.6 discloses an intelligent low-voltage power capacitor, which includes two low-voltage capacitor devices connected together as a whole by a connector, and an intelligent control device mounted above the two low-voltage power capacitor devices. The intelligent control device includes a housing and internal electrical components, and the housing is boat-shaped. Each low-voltage power capacitor device consists of two capacitor units assembled in a box. When low-voltage capacitors are used under conditions of long-term overvoltage, overheating, or aging, the internal insulation of the low-voltage capacitor may fail and cause a short circuit. In extreme cases, it may cause the casing to crack or even explode, damaging the circuits connected to the low-voltage capacitor. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a low-voltage capacitor specifically designed for power electronic equipment, thereby solving the problems mentioned in the background section.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a low-voltage capacitor for power electronic equipment, comprising a fixed housing, a low-voltage capacitor fixedly connected inside the fixed housing, a detachable terminal movably connected to the top of the low-voltage capacitor, a through hole for a ground wire interface to pass through on the fixed housing, the ground wire interface being movably connected to the fixed housing and interconnected with external circuits through the detachable terminal, the detachable terminal being connected to the low-voltage capacitor, thereby connecting the external circuit to the low-voltage capacitor, and the ground wire interface being interconnected with the external ground wire, so that the low-voltage capacitor can function as a ground; a pressure relief assembly is fixedly connected to the bottom of the fixed housing. Explosion-proof cooling components include: A sealing plate, which is movably connected inside the fixed shell; A limiting plate, which is movably connected to the outside of the sealing plate and located outside the fixed shell; The first spring has one end fixedly connected to the limiting plate near the fixed shell, and the other end fixedly connected to the fixed shell. The first spring is normally in a compressed state, which creates a gap between the sealing plate and the fixed shell to facilitate air circulation and dissipate heat from the low-voltage capacitor.

[0005] Two sealing plates are provided, and the two sealing plates are movably connected to the left and right sides of the low-voltage capacitor, respectively.

[0006] Both sides of the fixed shell are fixedly connected to limiting frames. Each limiting frame is movably connected to a limiting block on the side closest to the corresponding sealing plate. A second spring is fixedly connected to the outer side of each limiting block, and the second spring is fixedly connected to the inner wall of the limiting frame. When the two sealing plates are pushed outward, the limiting blocks are pushed into the limiting frame and the second springs are contracted until the limiting plates are located outside the limiting blocks. At this time, the limiting blocks will reset under the action of the second springs, allowing the limiting blocks to lock the position of the limiting plates.

[0007] Inside the fixed housing, a separation plate is movably connected to the top of the low-voltage capacitor, and the separation plate is located at the bottom of the detachable terminal. An exhaust hole is opened on the top of the fixed housing above the separation plate to facilitate the exhaust of air when the separation plate is pushed upward. When the separation plate is pushed upward, it will push the detachable terminal open, thereby disconnecting the external circuit from the low-voltage capacitor.

[0008] A heat-conducting plate is fixedly connected to the outer wall of the low-voltage capacitor, and the heat-conducting plate is fixedly connected to the inner wall of the fixed shell. A heat dissipation protrusion is fixedly connected to the outer wall of the fixed shell. The heat dissipation protrusion increases the contact area with the outside world to improve the heat exchange effect. The heat-conducting plate transfers the heat of the low-voltage capacitor to the fixed shell, and the heat dissipation protrusion facilitates heat exchange between the low-voltage capacitor and the outside world.

[0009] An air guide box is fixedly connected to the right side of the fixed shell. An electric fan is fixedly connected to the inner wall of the air guide box on the outer side of the corresponding sealing plate. The guide plate is fixedly connected to the outer wall of the sealing plate and located inside the air guide box.

[0010] The pressure relief assembly includes a pressure relief box, which is fixedly connected to the bottom of the fixed shell, and an airbag is fixedly connected to the bottom of the pressure relief box.

[0011] A pneumatic whistle is fixedly connected to the top of the airbag, and an exhaust groove is provided on the top of the airbag.

[0012] The pressure relief box is fixedly connected to a guide post inside, and a pressure plate is movably connected to the outer wall of the guide post. A third spring is fixedly connected to the bottom of the pressure plate, and a base plate is fixedly connected to the bottom of the third spring. The base plate is fixedly connected to the inner wall of the pressure relief box.

[0013] This invention provides a low-voltage capacitor specifically for power electronic equipment. It has the following advantages: 1. This low-voltage capacitor for power electronic equipment uses the expansion of explosive gas to push two sealing plates outwards, and the limiting block locks the position of the limiting plates, thus fixing the position of the sealing plates and sealing the inside of the fixed shell. This prevents the combustion caused by high temperature from continuing to come into contact with oxygen, thus quickly stopping the combustion and preventing excessive combustion. At the same time, the separation plate pushes open the detachable terminal, disconnecting the external circuit from the low-voltage capacitor and preventing damage to the external circuit.

[0014] 2. In the event of an explosion of the low-voltage capacitor used in this power electronic equipment, the fixed casing is sealed by the sealing plate, causing the guide plate to move with the sealing plate. At this time, the airflow generated by the electric fan will flow to the outside of the fixed casing and blow onto the heat dissipation protrusion to cool the outer wall of the fixed casing, thereby promoting the reduction of the internal temperature of the fixed casing. This quickly dissipates the heat from the explosion to the outside, reducing the internal temperature and preventing internal combustion, thus preventing high temperature from damaging nearby electrical equipment.

[0015] 3. The low-voltage capacitor for this power electronic device, when it explodes, causes the pressure plate to move rapidly downwards due to the gas, and the third spring is gradually compressed, thus absorbing the force generated by the explosion. The gradual movement of the pressure plate causes the airbag to be filled with gas, preventing the sealed container from being subjected to excessive pressure and rupturing. It buffers and absorbs the impact of the explosion on the container, preventing the outer shell from breaking and hitting external power equipment, thus preventing damage.

[0016] 4. In the event of an explosion of this low-voltage capacitor used in power electronic equipment, the sealed interior of the casing is sealed by a plate. This allows the expanding gas inside the casing to pass through a pressure relief box, increasing the gas level inside the air bladder. As the air bladder inflates, the internal gas is released under pressure via a pneumatic whistle, producing a sound. Simultaneously, some gas flows out through the exhaust channel, facilitating maintenance personnel to quickly locate the damaged low-voltage capacitor and address it promptly. This indirectly protects the circuit.

[0017] 5. This low-voltage capacitor for power electronic equipment is filled with gas through the air chamber. The pressure plate can prevent excessively high-temperature gas from entering the air chamber and ensure that the gas discharged from the exhaust channel is relatively low-temperature gas. The gas discharged from the exhaust channel flows through the heat dissipation protrusion to quickly cool the inside of the fixed shell, quickly dissipate the heat of the explosion to the outside, further reduce the internal temperature and prevent internal combustion, thereby preventing high temperature from damaging nearby electrical equipment. Attached Figure Description

[0018] Figure 1 This is a front-view stereoscopic structural diagram of the present invention; Figure 2 for Figure 1Enlarged structural diagram of section A in the middle; Figure 3 This is a schematic diagram of the right-side stereoscopic structure of the present invention; Figure 4 for Figure 3 Enlarged structural diagram of section B; Figure 5 for Figure 3 Enlarged structural diagram of section C; Figure 6 for Figure 1 Schematic diagram of cross-section structure; Figure 7 This is a schematic diagram of the three-dimensional structure of the present invention viewed from below; Figure 8 for Figure 7 Schematic diagram of cross-section structure; Figure 9 for Figure 8 Enlarged schematic diagram of section E in the middle; Figure 10 This is a schematic cross-sectional view of the fixed shell structure of the present invention; Figure 11 for Figure 3 Enlarged structural diagram of section D in the middle.

[0019] In the diagram: 1. Fixed shell; 2. Low-voltage capacitor; 3. Detachable terminal; 4. Grounding interface; 5. Explosion-proof cooling assembly; 501. Sealing plate; 502. Limiting plate; 503. First spring; 504. Limiting frame; 505. Second spring; 506. Limiting block; 507. Separation plate; 508. Heat-conducting plate; 509. Heat dissipation protrusion; 510. Air guide box; 511. Electric fan; 512. Guide plate; 6. Pressure relief assembly; 601. Pressure relief box; 602. Airbag; 603. Pneumatic whistle; 604. Pressure plate; 605. Third spring; 606. Base plate; 607. Guide column; 608. Exhaust channel. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0022] Example 1: Please refer to Figure 1-10The present invention provides a technical solution: a special low-voltage capacitor for power electronic equipment, including a fixed shell 1, a low-voltage capacitor 2 fixedly connected inside the fixed shell 1, a detachable terminal 3 movably connected to the top of the low-voltage capacitor 2, a grounding interface 4 fixedly connected to the top of the low-voltage capacitor 2, specifically, a grounding interface 4 movably connected to the outer wall of the fixed shell 1, and a pressure relief component 6 fixedly connected to the bottom of the fixed shell 1.

[0023] Preferably, a ground wire interface 4 is fixedly connected to the top of the low-voltage capacitor 2, and a through hole is provided on the corresponding position on the fixed shell 1. The ground wire interface 4 passes through the through hole and is slidably connected to the fixed shell 1 through a sealing ring.

[0024] Explosion-proof cooling assembly 5 includes: Sealing plate 501 is movably connected inside the fixed shell 1; Limiting plate 502 is movably connected to the outside of sealing plate 501 and located outside of fixed shell 1; The first spring 503 has one end fixedly connected to the limiting plate 502 near the fixed shell 1, and the other end fixedly connected to the fixed shell 1. The first spring 503 is normally in a compressed state, which creates a gap between the sealing plate 501 and the fixed shell 1 to facilitate air circulation and dissipate heat from the low-voltage capacitor 2.

[0025] The detachable terminal 3 is connected to the external circuit, and the detachable terminal 3 is connected to the low-voltage capacitor 2, so that the external circuit is connected to the low-voltage capacitor 2. The ground wire interface 4 is connected to the external ground wire, so that the low-voltage capacitor 2 can play the role of grounding.

[0026] When the applied voltage exceeds the rated voltage of the low-voltage capacitor 2, the internal insulating medium of the low-voltage capacitor 2 may be broken down, causing a short circuit and generating an arc discharge. This leads to a sharp increase in the internal temperature of the capacitor, and the electrolyte or gas inside the low-voltage capacitor 2 expands rapidly. The low-voltage capacitor 2 cannot withstand the pressure and explodes.

[0027] There are two sealing plates 501, and the two sealing plates 501 are respectively movably connected to the left and right sides of the low-voltage capacitor 2.

[0028] A limiting frame 504 is fixedly connected to both the left and right sides of the fixed shell 1. A limiting block 506 is movably connected to the side of the limiting frame 504 that is close to the corresponding sealing plate 501. A second spring 505 is fixedly connected to the outside of the limiting block 506, and the second spring 505 is fixedly connected to the inner wall of the limiting frame 504.

[0029] When an explosion occurs, the gas inside the fixed shell 1 expands rapidly, pushing the two sealing plates 501 outward. As the sealing plates 501 are pushed outward, the limiting plate 502 is also pushed outward, and the first spring 503 is stretched. As the limiting plate 502 moves, it pushes the limiting block 506 into the limiting frame 504 and causes the second spring 505 to contract until the limiting plate 502 is located outside the limiting block 506. At this time, the limiting block 506 will reset under the action of the second spring 505, thus locking the limiting plate 502 in place and sealing the inside of the fixed shell 1. This prevents the combustion caused by high temperature from continuing to contact with oxygen, thereby preventing excessive combustion.

[0030] Inside the fixed housing 1, a separation plate 507 is movably connected to the top of the low-voltage capacitor 2, and the separation plate 507 is located at the bottom of the detachable terminal 3. The top of the fixed housing 1 is provided with an exhaust hole (not shown in the figure) above the separation plate 507, which facilitates the exhaust of the top when the separation plate 507 is pushed upward.

[0031] When the explosion occurs, the expanding gas inside the fixed shell 1 will push the separation plate 507 upward, so that the separation plate 507 pushes open the detachable terminal 3, thereby disconnecting the external circuit from the low-voltage capacitor 2.

[0032] A heat-conducting plate 508 is fixedly connected to the outer wall of the low-voltage capacitor 2, and the heat-conducting plate 508 is fixedly connected to the inner wall of the fixed shell 1. A heat dissipation protrusion 509 is fixedly connected to the outer wall of the fixed shell 1.

[0033] The heat-conducting plate 508 transfers the heat of the low-voltage capacitor 2 to the fixed shell 1, and the heat dissipation protrusion 509 facilitates heat exchange between the low-voltage capacitor 2 and the outside environment.

[0034] An air guide box 510 is fixedly connected to the right side of the fixed shell 1. An electric fan 511 is fixedly connected to the inner wall of the air guide box 510 on the outer side of the corresponding sealing plate 501. A guide plate 512 is fixedly connected to the outer wall of the sealing plate 501 and located inside the air guide box 510.

[0035] Under normal operating conditions, there is a gap between the sealing plate 501 and the fixed shell 1. The airflow generated by the electric fan 511 flows over the surface of the low-voltage capacitor 2 to dissipate heat. At the same time, the heat-conducting plate 508 increases the heat dissipation area of ​​the low-voltage capacitor 2 generated by the airflow generated by the electric fan 511. After the low-voltage capacitor 2 explodes, the fixed shell 1 is sealed by the sealing plate 501, causing the guide plate 512 to move with the sealing plate 501. At this time, the airflow generated by the electric fan 511 flows to the outside of the fixed shell 1 and blows towards the heat dissipation protrusion 509 to cool the outer wall of the fixed shell 1, thereby promoting the reduction of the internal temperature of the fixed shell 1.

[0036] Example 2: Please refer to Figure 1-11 Based on Embodiment 1, the present invention provides a technical solution: The pressure relief assembly 6 includes a pressure relief box 601, which is fixedly connected to the bottom of the fixed shell 1, and an airbag 602 is fixedly connected to the bottom of the pressure relief box 601.

[0037] When the low-voltage capacitor 2 explodes, the inside of the fixed shell 1 is sealed by the sealing plate 501. This causes the gas inside the fixed shell 1 to expand through the pressure relief box 601, increasing the amount of gas inside the airbag 602 and causing the airbag 602 to expand, thus preventing the sealed container from rupturing due to excessive pressure.

[0038] A pneumatic whistle 603 is fixedly connected to the top of the airbag 602, and an exhaust groove 608 is provided on the top of the airbag 602. Preferably, the outlet of the exhaust groove 608 faces the heat dissipation protrusion 509 on the outer wall of the fixed shell 1.

[0039] When the airbag 602 inflates, the airbag 602 will elastically contract, causing the gas to be discharged through the pneumatic whistle 603, which will continuously emit a sound, making it easier for maintenance personnel to quickly locate the damaged low-voltage capacitor 2. At the same time, the gas discharged through the exhaust channel 608 will flow upward and pass through the heat dissipation protrusion 509.

[0040] The pressure relief box 601 is internally fixedly connected to a guide post 607. A pressure plate 604 is movably connected to the outer wall of the guide post 607. A third spring 605 is fixedly connected to the bottom of the pressure plate 604. A base plate 606 is fixedly connected to the bottom of the third spring 605. The base plate 606 is fixedly connected to the inner wall of the pressure relief box 601.

[0041] Preferably, the bottom of the pressure relief box 601 is provided with a through hole that connects to the airbag 602. When the pressure plate 604 moves down, gas enters the airbag through the through hole.

[0042] When the low-voltage capacitor 2 explodes, the pressure plate 604 will be pushed downwards by the gas, and the third spring 605 will be gradually compressed, thereby absorbing the force generated by the explosion. The gradual movement of the pressure plate 604 will cause the airbag 602 to be filled with gas. At this time, the pressure plate 604 can prevent excessively high-temperature gas from entering the airbag 602, thus preventing the airbag 602 from being damaged by high temperature. It also ensures that the gas discharged from the exhaust channel 608 is a relatively low-temperature gas, so that the gas discharged from the exhaust channel 608 flows through the heat dissipation protrusion 509 to quickly cool the inside of the fixed shell 1.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A low-voltage capacitor for power electronic equipment, comprising a fixed housing (1), characterized in that: A low-voltage capacitor (2) is fixedly connected inside the fixed shell (1). A detachable terminal (3) is movably connected to the top of the low-voltage capacitor (2). A grounding interface (4) is movably connected to the outer wall of the fixed shell (1). A pressure relief assembly (6) is fixedly connected to the bottom of the fixed shell (1). The explosion-proof cooling assembly (5) includes: A sealing plate (501) is movably connected inside the fixed shell (1); A limiting plate (502) is movably connected to the outside of the sealing plate (501) and located outside the fixed shell (1); The first spring (503) has one end fixedly connected to the side of the limiting plate (502) near the fixed shell (1), and the other end fixedly connected to the fixed shell (1).

2. A low-voltage capacitor for power electronic equipment according to claim 1, characterized in that: Two sealing plates (501) are provided, and the two sealing plates (501) are respectively movably connected to the left and right sides of the low-voltage capacitor (2).

3. A low-voltage capacitor for power electronic equipment according to claim 1, characterized in that: The fixed shell (1) is fixedly connected to the left and right sides of the fixed shell (1). The side of the fixed shell (504) close to the corresponding sealing plate (501) is movably connected to the limiting block (506). The outer side of the limiting block (506) is fixedly connected to the second spring (505), and the second spring (505) is fixedly connected to the inner wall of the limiting shell (504).

4. A low-voltage capacitor for power electronic equipment according to claim 1, characterized in that: Inside the fixed housing (1), a separation plate (507) is movably connected to the top of the low-voltage capacitor (2), and the separation plate (507) is located at the bottom of the detachable terminal (3).

5. A low-voltage capacitor for power electronic equipment according to claim 1, characterized in that: The low-voltage capacitor (2) is fixedly connected to a heat-conducting plate (508) on its outer wall, and the heat-conducting plate (508) is fixedly connected to the inner wall of the fixed shell (1). The fixed shell (1) is fixedly connected to a heat dissipation protrusion (509) on its outer wall.

6. A low-voltage capacitor for power electronic equipment according to claim 1, characterized in that: An air guide box (510) is fixedly connected to the right side of the fixed shell (1). An electric fan (511) is fixedly connected to the inner wall of the air guide box (510) on the outer side of the corresponding sealing plate (501). The guide plate (512) is fixedly connected to the outer wall of the sealing plate (501) and located inside the air guide box (510).

7. A low-voltage capacitor for power electronic equipment according to claim 1, characterized in that: The pressure relief assembly (6) includes a pressure relief box (601), which is fixedly connected to the bottom of the fixed shell (1), and an airbag (602) is fixedly connected to the bottom of the pressure relief box (601).

8. A low-voltage capacitor for power electronic equipment according to claim 7, characterized in that: A pneumatic whistle (603) is fixedly connected to the top of the airbag (602), and an exhaust groove (608) is provided on the top of the airbag (602).

9. A low-voltage capacitor for power electronic equipment according to claim 7, characterized in that: The pressure relief box (601) is fixedly connected to a guide post (607), and a pressure plate (604) is movably connected to the outer wall of the guide post (607). A third spring (605) is fixedly connected to the bottom of the pressure plate (604), and a base plate (606) is fixedly connected to the bottom of the third spring (605). The base plate (606) is fixedly connected to the inner wall of the pressure relief box (601).

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