Self-healing low-voltage shunt capacitor device

Abstract

The utility model discloses a self-healing low-voltage shunt capacitor device, which relates to the technical field of capacitors, and comprises a protective shell, a capacitor cover arranged on the protective shell, a capacitor power connection assembly, an explosion-proof assembly, a filter assembly and a core assembly. According to the utility model, the pressure sensor, the solenoid valve and the multi-layer filtering structure are arranged, so that the pressure can be released in time when the internal pressure of the capacitor is too high, explosion accidents are avoided, impurities and sparks in discharged gas are effectively filtered, and the use safety is improved; the elastic pressing structure in the bolt power connection structure of the device can ensure stable connection between the conductive sheet and the electrode sheet, reduce contact resistance, reduce heating and faults, and ensure stable conductive performance.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, specifically a self-healing low-voltage parallel capacitor device. Background Technology

[0002] Self-healing low-voltage parallel capacitors are widely used in low-voltage power systems to improve power factor and power quality. However, during actual use, due to long-term operation or exposure to abnormal voltage or current, internal faults may occur in the capacitor, such as localized overheating or breakdown. If not handled promptly, these faults may lead to serious accidents such as explosions.

[0003] Traditional capacitor explosion-proof devices typically use two metal plates connected together to electrically connect the inner and outer electrodes of the capacitor. When the capacitor explodes and deforms, the metal plates will separate, thus cutting off the circuit. This can only prevent the explosion from escalating, but cannot prevent damage to the capacitor device. At the same time, existing capacitors also have problems with inconvenience and instability in terms of installation and wiring, which affects their performance and safety. Utility Model Content

[0004] This invention provides a self-healing low-voltage parallel capacitor device, which has the advantages of explosion protection and convenient and stable wiring, thus solving the problems of existing equipment explosion protection devices damaging capacitors and inconvenient and unstable wiring.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a self-healing low-voltage parallel capacitor device, comprising a protective shell and a capacitor cover disposed on the protective shell, and further comprising a capacitor connection assembly, an explosion-proof assembly, a filter assembly, and a core assembly, wherein:

[0006] The capacitor cover includes a top cover, which is fixed to the cover groove by screws. A filter groove is provided in the middle of the cover groove, and electrical connection grooves are symmetrically provided on both sides of the filter groove.

[0007] The capacitor connection assembly includes a connection bolt that passes through the outer side of the connection groove and is locked. The connection bolt is provided with a conductive plate. One side of the conductive plate abuts against the electrode plate and is locked by the bolt. One side of the electrode plate is provided with a pressure plate. The pressure plate is welded to the connection groove by a spring.

[0008] The explosion-proof component includes an isolation plate, on which a controller is provided. The controller is electrically connected to a solenoid valve and a pressure sensor. One end of the solenoid valve is connected to an air inlet pipe, and the other end is connected to an air outlet pipe.

[0009] As a preferred embodiment of this utility model, the air inlet pipe is locked to the isolation plate and connects to the inside of the protective shell, the air outlet pipe is locked to the bottom of the cover groove and connects to the filter groove, and the pressure sensor is locked to the isolation plate by threads and connects to the inside of the protective shell.

[0010] As a preferred technical solution of this utility model, the inner wall of the protective shell is provided with a plurality of heat dissipation fins, the heat dissipation fins are immersed in insulating liquid, the outer end of the electrical connection bolt is nested with an insulating sleeve, and the inner end passes through a pressure plate, the pressure plate abuts against the electrode plate.

[0011] As a preferred embodiment of the present invention, the filter assembly includes a metal wire mesh filter layer, an activated carbon filter layer is disposed above the metal wire mesh filter layer, and both the metal wire mesh filter layer and the activated carbon filter layer are fixed in the filter tank.

[0012] As a preferred technical solution of this utility model, the bottom of the protective shell is provided with a conductive bolt, the conductive bolt is grounded through a wire, and the top cover is provided with a plurality of pressure relief holes, the pressure relief holes being located directly above the filter tank.

[0013] As a preferred embodiment of this utility model, the core assembly includes several capacitor units, each capacitor unit being a layered structure of interlaced metallized thin film and insulating dielectric, and an insulating sealing gasket is embedded in the isolation plate.

[0014] As a preferred embodiment of this utility model, the positive and negative electrodes of the metallized film are electrically connected to the electrode sheet through the insulating sealing gasket via wires, the bottom of the capacitor unit is fixed to the insulating frame by bolts, and the insulating frame is welded to the inner wall of the protective shell.

[0015] Compared with the prior art, this utility model provides a self-healing low-voltage parallel capacitor device with the following advantages: By setting a pressure sensor, solenoid valve and multi-layer filter structure, this utility model can release pressure in time when the internal pressure of the capacitor is too high, avoiding the occurrence of explosion accidents. At the same time, it effectively filters out impurities and sparks in the discharged gas, improving the safety of use. The elastic clamping structure in the bolt connection structure of this device can ensure a firm connection between the conductive sheet and the electrode sheet, reduce contact resistance, reduce heat generation and failure, and ensure stable conductivity. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the external structure of this utility model;

[0017] Figure 2 This is a diagram of the internal structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the capacitor cover of this utility model;

[0019] Figure 4 This is a structural diagram of the capacitor connection assembly of this utility model;

[0020] Figure 5 This is a schematic diagram of the explosion-proof component structure of this utility model;

[0021] Figure 6 This is a structural diagram of the filter assembly of this utility model.

[0022] In the diagram: 1. Protective housing; 11. Conductive bolt; 12. Heat sink fins; 2. Capacitor cover; 21. Top cover; 22. Cover groove; 211. Pressure relief hole; 221. Filter groove; 222. Electrical connection groove; 3. Capacitor connection assembly; 31. Electrical connection bolt; 32. Conductive sheet; 33. Electrode sheet; 34. Pressure plate; 35. Spring; 36. Insulating sleeve; 4. Explosion-proof assembly; 41. Isolation plate; 42. Controller; 43. Solenoid valve; 44. Pressure sensor; 45. Inlet pipe; 46. Outlet pipe; 5. Filter assembly; 51. Metal mesh filter layer; 52. Activated carbon filter layer; 6. Core assembly; 61. Capacitor unit; 611. Metallized film; 612. Insulating medium; 62. Insulating sealing gasket; 63. Insulating frame. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0024] Please see Figures 1-6 This utility model discloses a self-healing low-voltage parallel capacitor device, including a protective shell 1 and a capacitor cover 2 disposed on the protective shell 1, as well as a capacitor connection assembly 3, an explosion-proof assembly 4, a filter assembly 5, and a core assembly 6, wherein:

[0025] The capacitor cover 2 includes a top cover 21, which is fixed to the cover groove 22 by screws. A filter groove 221 is provided in the middle of the cover groove 22, and electrical connection grooves 222 are symmetrically provided on both sides of the filter groove 221.

[0026] Please refer to the appendix. Figure 4The capacitor connection assembly 3 includes a connection bolt 31, which passes through the outer side of the connection groove 222 and is locked. A conductive piece 32 is provided on the connection bolt 31. One side of the conductive piece 32 abuts against the electrode piece 33 and is locked by the bolt. A pressure plate 34 is provided on one side of the electrode piece 33. The pressure plate 34 is welded to the connection groove 222 by a spring 35. Specifically, the conductive piece 32 enables the current connected to the electrode piece 33 to be combined and connected in parallel, and finally connected to the outside from the outer end of the connection bolt 31 located in the middle, thereby connecting the capacitor device to the power system.

[0027] Please refer to the appendix. Figure 5 The explosion-proof component 4 includes an isolation plate 41, on which a controller 42 is provided. The controller 42 is electrically connected to a solenoid valve 43 and a pressure sensor 44. One end of the solenoid valve 43 is connected to an air inlet pipe 45, and the other end is connected to an air outlet pipe 46.

[0028] The air inlet pipe 45 is locked onto the isolation plate 41 and connects to the inside of the protective housing 1. The air outlet pipe 46 is locked onto the bottom of the cover groove 22 and connects to the filter groove 221. The pressure sensor 44 is locked onto the isolation plate 41 by threads and connects to the inside of the protective housing 1.

[0029] In this embodiment, the pressure sensor 44 monitors the pressure in real time. When the pressure inside the capacitor exceeds the set threshold, the pressure sensor 44 transmits a signal to the controller 42. The controller 42 triggers the solenoid valve 43 to open, and the internal gas passes through the solenoid valve 43 from the air inlet pipe 45 and enters the filter tank 221 from the air outlet pipe 46, thereby quickly expelling the high temperature and high pressure gas inside and preventing the capacitor from exploding. Example 2

[0030] Based on the above embodiment 1, please refer to the appendix. Figure 2 , Figure 3 as well as Figure 6 The inner wall of the protective housing 1 is provided with several heat dissipation fins 12, which are immersed in insulating liquid. The outer end of the connecting bolt 31 is nested with an insulating sleeve 36, and the inner end passes through the pressure plate 34. The pressure plate 34 abuts against the electrode plate 33. Specifically, the heat dissipation fins 12 can increase the heat dissipation area of ​​the protective housing 1 and accelerate the heat dissipation inside the capacitor device.

[0031] The filter assembly 5 includes a metal wire mesh filter layer 51, and an activated carbon filter layer 52 is provided above the metal wire mesh filter layer 51. Both the metal wire mesh filter layer 51 and the activated carbon filter layer 52 are fixed in the filter tank 221.

[0032] The bottom of the protective housing 1 is provided with a conductive bolt 11, which is grounded through a wire. The top cover 21 is provided with several pressure relief holes 211, which are located directly above the filter tank 221.

[0033] The core assembly 6 includes several capacitor units 61. Each capacitor unit 61 has an interlaced ring structure of metallized thin film 611 and insulating medium 612. An insulating sealing gasket 62 is embedded on the isolation plate 41. Specifically, the insulating sealing gasket 62 can separate the conductive wires to prevent breakdown, and at the same time ensure that the internal air pressure of the capacitor device does not leak out, thereby ensuring the accuracy of the pressure sensor 44 and triggering the solenoid valve 43 to open in time to avoid explosion.

[0034] The positive and negative electrodes of the metallized thin film 611 pass through the insulating sealing gasket 62 via wires and are electrically connected to the electrode sheet 33. The bottom of the capacitor unit 61 is fixed to the insulating frame 63 by bolts, and the inner wall of the protective shell 1 is welded to the insulating frame 63.

[0035] In this embodiment, during the operation of the capacitor, if a breakdown point occurs in the insulating medium 612 due to excessive voltage, partial discharge, or other reasons, the metallization film 611 will form a tiny metal melting spot around the breakdown point to isolate the breakdown point and enable the capacitor to continue to work normally. When an insulation fault occurs inside the capacitor, causing the protective shell 1 to become energized, the conductive bolt 11 can conduct the current to the ground through the grounding wire to prevent the operator from being electrocuted.

[0036] The working principle and usage process of this utility model are as follows: When assembling the capacitor device, the positive terminal of the capacitor unit 61 is connected to the same side of the electrical groove 222 through the electrode plate 33, and conduction is achieved by abutting the same conductive plate 32, while the negative terminal is connected to the other side of the electrical groove 222, so that each capacitor unit 61 is connected in parallel. When connecting to the power, the electrode plate 33 is first locked to the conductive plate 32 by the electrical bolt 31. At the same time, the pressure plate 34 makes the electrode plate 33 stick tightly to the conductive plate 32 under the elastic force of the spring 35, reducing the contact resistance, reducing the generation of heat and malfunctions, and ensuring the safety and stability of the wiring.

[0037] When a fault occurs inside the capacitor device and the pressure increases, the pressure sensor 44 monitors the pressure in real time. Once the pressure exceeds the set threshold, the pressure sensor 44 transmits a signal to the controller 42. The controller 42 triggers the solenoid valve 43 to open, and the internal gas passes through the solenoid valve 43 from the air inlet pipe 45 and enters the filter tank 221 from the air outlet pipe 46. This allows the high-temperature and high-pressure gas inside to be quickly discharged from the pressure relief hole 211, preventing the capacitor device from exploding.

[0038] Meanwhile, the metal wire mesh filter layer 51 and the activated carbon filter layer 52 in the filter tank 221 can effectively filter impurities and sparks in the discharged gas, prevent external fires, and greatly improve the safety performance of the capacitor device.

Claims

1. A self-healing low-voltage shunt capacitor device comprising a protective housing (1) and a capacitor cover (2) arranged on the protective housing (1), characterized in that It also includes a capacitor connection assembly (3), an explosion-proof assembly (4), a filter assembly (5), and a core assembly (6), wherein: The capacitor cover (2) includes a top cover (21), which is fixed to the cover groove (22) by screws. A filter groove (221) is provided in the middle of the cover groove (22), and electrical connection grooves (222) are symmetrically provided on both sides of the filter groove (221). The capacitor connection assembly (3) includes a connection bolt (31), which passes through the outer side of the connection groove (222) and is locked. A conductive plate (32) is provided on the connection bolt (31). One side of the conductive plate (32) abuts against the electrode plate (33) and is locked by the bolt. A pressure plate (34) is provided on one side of the electrode plate (33). The pressure plate (34) is welded to the connection groove (222) by a spring (35). The explosion-proof component (4) includes an isolation plate (41), on which a controller (42) is provided. The controller (42) is electrically connected to a solenoid valve (43) and a pressure sensor (44). One end of the solenoid valve (43) is connected to an air inlet pipe (45), and the other end is connected to an air outlet pipe (46).

2. A self-healing low voltage shunt capacitor device according to claim 1, characterized in that: The air inlet pipe (45) is locked on the isolation plate (41) and connected to the inside of the protective shell (1). The air outlet pipe (46) is locked at the bottom of the cover groove (22) and connected to the filter groove (221). The pressure sensor (44) is locked on the isolation plate (41) by threads and connected to the inside of the protective shell (1).

3. A self-healing low voltage shunt capacitor device according to claim 2, characterized in that: The inner wall of the protective shell (1) is provided with a number of heat dissipation fins (12), the heat dissipation fins (12) are immersed in insulating liquid, the outer end of the electrical bolt (31) is nested with an insulating sleeve (36), and the inner end passes through the pressure plate (34), the pressure plate (34) abuts against the electrode plate (33).

4. A self-healing low voltage shunt capacitor device according to claim 1, characterized in that: The filter assembly (5) includes a metal wire mesh filter layer (51), and an activated carbon filter layer (52) is provided above the metal wire mesh filter layer (51). Both the metal wire mesh filter layer (51) and the activated carbon filter layer (52) are fixed in the filter tank (221).

5. A self-healing low voltage shunt capacitor device according to claim 4, characterized in that: The protective housing (1) has a conductive bolt (11) at the bottom, which is grounded by a wire. The top cover (21) has several pressure relief holes (211) located directly above the filter tank (221).

6. A self-healing low voltage shunt capacitor device according to claim 5, characterized in that: The core assembly (6) includes several capacitor units (61), each capacitor unit (61) having an interlocking ring structure of metallized thin film (611) and insulating medium (612), and an insulating sealing gasket (62) is embedded on the isolation plate (41).

7. A self-healing low voltage shunt capacitor device according to claim 6, characterized in that: The positive and negative electrodes of the metallized thin film (611) pass through the insulating sealing gasket (62) and are electrically connected to the electrode sheet (33) via wires. The bottom of the capacitor unit (61) is fixed to the insulating frame (63) by bolts. The insulating frame (63) is welded to the inner wall of the protective shell (1).

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