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CN-121983478-A - Electrical safety device for circuit protection

CN121983478ACN 121983478 ACN121983478 ACN 121983478ACN-121983478-A

Abstract

The application belongs to the technical field of circuit breakers, and discloses an electric safety device for protecting a circuit, which comprises a shell, wherein a static contact rod, a moving contact, an arc striking piece, an arc extinguishing grid and an elastic mechanical part are arranged in the shell, the elastic mechanical part is used for keeping the moving contact in contact with the static contact rod when the circuit is normal and separating the moving contact from the static contact rod when the circuit is in short circuit, the electric safety device also comprises an auxiliary arc extinguishing mechanism, the auxiliary arc extinguishing mechanism comprises an injection assembly and a nitrogen supply assembly, the injection assembly is arranged in the shell and aligned with a gap of the arc extinguishing grid, and the nitrogen supply assembly is arranged outside the shell and supplies nitrogen to the injection assembly when the moving contact is separated from the static contact rod. The application obviously improves the arc extinguishing efficiency and reliability and improves the safety of the whole electrical system.

Inventors

  • HUANG XIEYUN
  • ZHANG QIANG
  • ZHENG WEIJIAN

Assignees

  • 泰姆电气(杭州)股份有限公司

Dates

Publication Date
20260505
Application Date
20260228

Claims (10)

  1. 1. An electrical safety device for circuit protection comprises a shell (1), wherein a static contact rod (11), a moving contact (12), an arc striking piece (13), an arc extinguishing grid (14) and an elastic mechanical component (15) are arranged in the shell (1), the elastic mechanical component (15) is used for keeping the moving contact (12) in contact with the static contact rod (11) when a circuit is normal and controlling the moving contact (12) to be separated from the static contact rod (11) when the circuit is in short circuit, and the electrical safety device is characterized by further comprising an auxiliary arc extinguishing mechanism (2), the auxiliary arc extinguishing mechanism (2) comprises an injection assembly (21) and a nitrogen supply assembly (22), the injection assembly (21) is arranged in the shell (1) and aligned with a gap of the arc extinguishing grid (14), and the nitrogen supply assembly (22) is arranged outside the shell (1) and supplies nitrogen to the injection assembly (21) when the moving contact (12) is separated from the static contact rod (11).
  2. 2. An electrical safety device for circuit protection according to claim 1, wherein the nitrogen supply assembly (22) comprises a nitrogen storage unit (221), an opening and closing unit (222) and a linkage unit (223), the nitrogen storage unit (221) comprising a nitrogen storage tank (2211), a mounting plate (2212) and a shutter plate (2213); The nitrogen storage tank (2211) is fixed at the top of the shell (1), the mounting plate (2212) is fixed at a position, close to one side of the arc extinguishing grid (14), of the inner wall of the nitrogen storage tank (2211), a through hole (22121) for mounting the flashboard (2213) is formed in the mounting plate (2212), one end, close to the arc extinguishing grid (14), of the nitrogen storage tank (2211) is fixed and communicated with the connecting pipe (22111), and one end, far from the nitrogen storage tank (2211), of the connecting pipe (22111) penetrates through the top of the shell (1) and is connected with the spraying assembly (21); The opening and closing unit (222) is arranged on the nitrogen storage tank (2211) and connected with the flashboard (2213), and the linkage unit (223) is linked with the central shaft of the handle in the elastic mechanical component (15) so as to open and close the flashboard (2213) through the opening and closing unit (222).
  3. 3. The electric safety device for circuit protection according to claim 2, wherein the opening and closing unit (222) comprises a fixed block (2221), a rotating block (2222), a connecting column (2223), a U-shaped plate (2224), a driving column (2225), a driving block (2226), a sleeve (2227) and a first spring (2228); The fixing block (2221) is fixed on the outer wall of the nitrogen storage tank (2211), and one end of the fixing block (2221) far away from the nitrogen storage tank (2211) is provided with an installation groove (22211) for the rotation of the rotating block (2222); one end of a connecting column (2223) sequentially penetrates through the inner wall of a mounting groove (22211) close to a nitrogen storage tank (2211), the outer wall of the nitrogen storage tank (2211) and is in clearance fit with the mounting groove, the outer wall of the nitrogen storage tank (2211), the other end of the connecting column (2223) is fixed with one end of a rotating block (2222) close to the nitrogen storage tank (2211), one end of the connecting column (2223) close to the axis of the nitrogen storage tank (22121) penetrates through the side wall of a through hole (22121) and is fixed with one end of a flashboard (2213), a U-shaped plate (2224) is fixed at one end of the fixed block (2221) far away from the nitrogen storage tank (2211), a movable cavity (22221) in clearance fit with a driving column (2225) is arranged in the rotating block (2222), a driving block (2226) is fixed on the side wall of the driving column (2225), a spiral groove (22222) in sliding fit with the driving block (2225) is arranged on the inner wall of the movable cavity (22221), the other end of a sleeve (2227) penetrates through the side wall of the moving cavity (22221) far away from the nitrogen storage tank (2211) and is fixed with one end of the flashboard (2213), the U-shaped plate (2228) is in clearance fit with the first side wall (2228), one end of the first spring (2228) is fixed with the driving column (2225), the other end of the first spring (2228) is fixed with the inner wall of the movable cavity (22221) at one side far away from the nitrogen storage tank (2211), and the linkage unit (223) controls the driving column (2225) to move towards one side far away from the flashboard (2213) in the process of separating the movable contact (12) from the static contact rod (11).
  4. 4. An electrical safety device for circuit protection according to claim 3, characterized in that the linkage unit (223) comprises a sleeve (2231), a movable plate (2232), a second spring (2233), a positioning rod (2234), a fixed rod (2235), a fixed pulley (2236) and a traction rope (2237); The movable plate (2232) is in sliding fit with the inner wall of the sleeve (2231), two ends of the second spring (2233) are respectively fixed with the movable plate (2232) and the inner wall of the sleeve (2231), the expansion direction of the second spring (2233) is axially parallel to the sleeve (2231), the positioning rod (2234) is fixed at one end of the movable plate (2232) far away from the second spring (2233), the fixed rod (2235) is fixed at the top of the shell (1), the fixed pulley (2236) is sleeved on the fixed rod (2235) and is in rotary connection, a plurality of groups of fixed rods (2235) and fixed pulleys (2236) are arranged, one end of the traction rope (2237) is fixed with one end of the movable plate (2232) far away from the positioning rod (2237), and the other end of the traction rope (2237) passes through the sleeve (2227) and is fixed with the driving column (2225) after bypassing the fixed pulleys (2236); the side wall of the positioning rod (2234) is provided with a V-shaped groove (22341) near the handle, and the central shaft is provided with an elastic positioning component (3) matched with the V-shaped groove (22341).
  5. 5. An electrical safety device for the protection of an electrical circuit according to claim 4, wherein the elastic positioning assembly (3) comprises a connecting arm (31), a fixed plate (32), a mobile plate (33), a sliding sleeve (34), a positioning block (35) and a third spring (36); The connecting arm (31) is fixed with the central shaft, the fixing plate (32) is fixed on the connecting arm (31), the moving plate (33) is sleeved on the connecting arm (31) and is in sliding fit, the sliding sleeve (34) is fixed on the moving plate (33), the inner wall of the sliding sleeve (34) is in sliding fit with one end, far away from the central shaft, of the connecting arm (31), the locating block (35) is fixed with one end, far away from the connecting arm (31), of the sliding sleeve (34), inclined surfaces matched with the V-shaped grooves (22341) are formed in the side walls of the two sides of the locating block (35), the third spring (36) is sleeved on the connecting arm (31), and two ends of the third spring (36) are respectively fixed with one side, close to the fixing plate (32) and one side, close to the moving plate (33), of the other side.
  6. 6. The electric safety device for circuit protection according to claim 5, wherein the controller (4) is fixed on the top of the housing (1), the time relay (5) is fixed on the outer wall of the sleeve (2231), the electromagnet (6) is fixed in the sleeve (2231), the time relay (5) and the electromagnet (6) are electrically connected with the controller (4), and after the movable contact (12) is separated from the static contact rod (11), the controller (4) cooperates with the time relay (5) and controls the electromagnet (6) to be electrified within a specified time to attract the movable plate (2232) to reset, so that the nitrogen supply is cut off.
  7. 7. An electrical safety device for protecting an electrical circuit according to claim 6, wherein the side wall of the nitrogen storage tank (2211) is provided with an inflation tube (22112) and an air pressure sensor (22113) for monitoring the air pressure inside the nitrogen storage tank (2211).
  8. 8. An electrical safety device for protecting an electrical circuit according to claim 6, wherein the injection assembly (21) comprises a pipe unit (211) and an elastic gate valve unit (212), the pipe unit (211) comprises a main pipe (2111) communicated with the connecting pipe (22111) and branch pipes (2112) communicated with one side of the side wall of the main pipe (2111) close to the arc extinguishing grid (14), the elastic gate valve unit (212) is arranged in the branch pipes (2112) for controlling gas path on-off, and the number of groups of the elastic gate valve units (212) is equal to the number of the branch pipes (2112).
  9. 9. The electric safety device for circuit protection according to claim 8, wherein an air inlet (21121) and a mounting cavity (21122) are arranged in the branch pipeline (2112), the air inlet (21121) is communicated with the main pipeline (2111), the mounting cavity (21122) is positioned at one side of the air inlet (21121) far away from the main pipeline (2111) and is communicated with the air inlet (21121), one side of the inner wall of the mounting cavity (21122) close to the main pipeline (2111) is hemispherical, a plurality of air outlet holes (21123) are further arranged in the branch pipeline (2112), the air outlet holes (21123) are L-shaped, one end of each air outlet hole (21123) is communicated with a spherical part of the mounting cavity (21122), and the other end of each air outlet hole (21123) is communicated with one end of the branch pipeline (2112) far away from the main pipeline (2111); The elastic gate valve unit (212) comprises a fourth spring (2121) and a blocking ball (2122), wherein the fourth spring (2121) is arranged in the installation cavity (21122), one end of the fourth spring is fixed with the inner wall of the installation cavity (21122) at one side far away from the main pipeline (2111), the blocking ball (2122) is in sliding fit with the installation cavity (21122), and the blocking ball (2122) abuts against one end, close to the main pipeline (2111), of the fourth spring (2121).
  10. 10. An electrical safety device for protecting an electrical circuit according to claim 8, wherein the shutter (2213) has a parallelogram cross section.

Description

Electrical safety device for circuit protection Technical Field The invention relates to the technical field of circuit breakers, in particular to an electrical safety device for circuit protection. Background In electric power systems and electrical equipment, circuit protection devices (such as circuit breakers and leakage protectors) are core components for guaranteeing safe and stable operation of circuits, and have the core functions of rapidly cutting off fault circuits when faults such as short circuits, overload and the like occur in the circuits, so that safety accidents such as equipment burning and line firing and the like caused by fault expansion are avoided. Particularly in the manufacturing and application scenes of power electronic components such as metal oxide semiconductor field effect transistors, insulated gate bipolar transistor chips and modules, the requirements of the components on circuit stability and fault response speed are extremely high, and if an arc generated by a short circuit fault cannot be extinguished rapidly, precise components are extremely easy to break down, so that high production loss and equipment damage are caused. The invention discloses a circuit breaker overload protection structure in Chinese patent application with publication number CN114597104A, which comprises a current transformer, a bimetallic strip and a hard wire, wherein the current transformer, the bimetallic strip and the hard wire are arranged in a base, one end of the bimetallic strip is a bendable part in driving connection with a lock catch of a circuit breaker operating mechanism, the other end of the bimetallic strip is a connecting part, one end of the hard wire is connected with a wiring board, the other end of the hard wire penetrates through the current transformer and then is connected with the connecting part of the bimetallic strip, and the connecting part of the bimetallic strip is connected with a movable contact. The overload protection structure of the circuit breaker is provided with an arc extinguishing chamber, a plurality of arc extinguishing grids which are distributed in parallel are arranged in the arc extinguishing chamber, and the arc entering the arc extinguishing chamber is extinguished only by the arc extinguishing grids, so that the requirements of quick arc extinguishing and re-ignition avoidance under a high-current scene are difficult to meet. Disclosure of Invention In order to solve the above problems, the present invention provides an electrical safety device for circuit protection, so as to improve the arc extinguishing efficiency and reliability and ensure the safety of the whole electrical system. The technical aim of the invention is achieved by the following technical scheme that the electric safety device for circuit protection comprises a shell, wherein a static contact rod, a moving contact, an arc striking piece, an arc extinguishing grid and an elastic mechanical part are arranged in the shell, the elastic mechanical part is used for keeping the moving contact in contact with the static contact rod when a circuit is normal and separating the braking contact from the static contact rod when the circuit is in short circuit, the electric safety device further comprises an auxiliary arc extinguishing mechanism, the auxiliary arc extinguishing mechanism comprises an injection assembly and a nitrogen supply assembly, the injection assembly is arranged in the shell and aligned to an arc extinguishing grid gap, and the nitrogen supply assembly is arranged outside the shell and supplies nitrogen to the injection assembly when the moving contact is separated from the static contact rod. Through adopting above-mentioned technical scheme, in the auxiliary arc extinguishing mechanism, supply nitrogen subassembly to provide nitrogen gas to the injection subassembly when moving contact and quiet feeler lever separation produce electric arc, the injection subassembly is with nitrogen gas accurate injection to the arc extinguishing bars clearance, utilize inertia and the cooling characteristic of nitrogen gas, the cooperation arc extinguishing bars is to the segmentation effect of electric arc, can reduce the electric arc temperature fast, isolated electric arc and air contact, effectively restrain electric arc afterburning, the production circuit protection of high-accuracy components and parts such as insulated gate bipolar transistor chip has improved whole electrical system's security. The nitrogen supply assembly comprises a nitrogen storage unit, an opening and closing unit and a linkage unit, wherein the nitrogen storage unit comprises a nitrogen storage tank, a mounting plate and a flashboard, the nitrogen storage tank is fixed at the top of the shell, the mounting plate is fixed at the position, close to one side of the arc extinguishing grid, of the inner wall of the nitrogen storage tank, a through hole for mounting the flashboard is formed in the mounting p