A gas-filled cabinet circuit breaker

Abstract

The present invention relates to the technical field of power supply and distribution equipment, and in particular to a gas-filled cabinet circuit breaker. The gas-filled cabinet circuit breaker of the present invention has a simple structure. The transmission components from the operating mechanism to the arc extinguishing chamber only include a switch main shaft, a crank arm, an insulating pull rod and an energy storage component, which can ensure the mechanical reliability and stability of the circuit breaker. In addition, an energy storage component is arranged on a section of the switch main shaft close to the crank arm. When the switch is pulled down to close, the energy storage component can store energy, and when the switch is opened, the stored energy can be transferred to the crank arm, so that the opening kinetic energy can be distributed to the insulating pull rod through the crank arm, thereby reducing the energy transmission loss of the operating mechanism and improving the opening and closing stability of the gas-filled cabinet circuit breaker.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply and distribution equipment, in particular to a gas-filled cabinet circuit breaker. Background Art

[0002] Inflatable cabinet circuit breakers use inert gas as arc extinguishing and insulating medium. The switch has a breaking function, the breaking voltage can be made higher, and a large number of continuous breaking times are allowed. It is suitable for frequent operation and has the advantages of low noise and no fire risk. However, traditional inflatable cabinet circuit breakers have a complex structural design, insufficient stability, and the switch main shaft usually uses glass fiber rods, which have a short lifespan. Summary of the Invention

[0003] In order to solve the above problems existing in the prior art, the present invention provides a gas-filled cabinet circuit breaker.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A gas cabinet circuit breaker comprises: a base; a switch main shaft, disposed on the base and having one end connected to an operating mechanism, the switch main shaft being rotatable along its own axis by the operating mechanism; an arc extinguishing chamber, disposed below the switch main shaft; a crank arm, disposed on the switch main shaft and rotatable with the switch main shaft; an insulating pull rod, one end hinged to the crank arm and the other end movable up and down as the crank arm rotates to approach or move away from the arc extinguishing chamber; an energy storage assembly being disposed on a section of the switch main shaft near the crank arm, the switch main shaft driving the insulating pull rod downward via the crank arm and compressing the energy storage assembly.

[0006] Furthermore, the energy storage assembly includes a torsion spring sleeved on the switch main shaft, a limit rod is provided on the base, a rotating rod is provided on the crank arm, and the two torsion arms of the torsion spring respectively abut the limit rod and the rotating rod, and the rotating rod compresses the torsion arm of the torsion spring as the crank arm rotates.

[0007] Furthermore, an arc-shaped bent portion is provided on the torsion arm of the torsion spring abutting against the rotating rod.

[0008] Furthermore, an intermediate block is provided between the crank arm and the insulating pull rod, the intermediate block is hinged to the crank arm, a mounting hole is provided on the intermediate block, one end of the insulating pull rod passes through the mounting hole and is fixedly connected to the intermediate block.

[0009] Furthermore, a guide plate is provided between the insulating pull rod and the arc extinguishing chamber, and a guide hole is provided on the guide plate. The insulating pull rod can pass through the guide hole to approach or move away from the arc extinguishing chamber.

[0010] Furthermore, the switch main shaft is made of 45 steel material.

[0011] Furthermore, the insulating pull rod is made of SMC composite material.

[0012] Furthermore, there are three crank arms and they are spaced apart on the switch main shaft, and there are three insulating pull rods and three arc extinguishing chambers and they are respectively arranged corresponding to the three crank arms.

[0013] Furthermore, there are two energy storage components, which are respectively arranged at two ends of the switch main shaft.

[0014] Furthermore, the two energy storage components are arranged opposite to each other.

[0015] The present invention mainly has the following beneficial effects:

[0016] The inflatable cabinet circuit breaker of the present invention has a simple structure. The transmission components from the operating mechanism to the arc extinguishing chamber are only the switch main shaft, the crank arm, the insulating pull rod and the energy storage component, which can ensure the mechanical reliability and stability of the circuit breaker. In addition, the energy storage component is arranged on a section of the switch main shaft close to the crank arm. The energy storage component can store energy when the switch is pulled down to close, and can transfer the stored energy to the crank arm when the switch is opened, so that the opening kinetic energy can be distributed to the insulating pull rod through the crank arm, reducing the energy transmission loss of the operating mechanism, and at the same time, it can also improve the opening and closing stability of the inflatable cabinet circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 1 is a schematic structural diagram of a gas cabinet circuit breaker according to an embodiment of the present invention;

[0018] Figure 2 1 is a schematic diagram of the assembly of the switch spindle portion of an embodiment of the present invention;

[0019] Figure 3 yes Figure 1 Enlarged schematic diagram of point A in the middle. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] Reference Figures 1 to 3An inflatable cabinet circuit breaker is shown, which includes a base 100 and a switch main shaft 300 arranged on the base 100, and an operating mechanism 200 is arranged on the left or right side of the base 100, and the operating mechanism 200 is connected to the switch main shaft 300, and is used to drive the switch main shaft 300 to rotate forward or reverse along its own axis. In this embodiment, the operating mechanism 200 can adopt conventional models and specifications on the market, and the specific structure of the operating mechanism 200 is not within the scope of protection of the present invention and is not described here; at least one crank arm 500 is provided on the switch main shaft 300, and the crank arm 500 can be fixed to the switch main shaft 300 by clamping, crimping, threading or welding, and the crank arm 500 can rotate with the switch main shaft 300, and an arc extinguishing chamber 400 is also provided on the base 100, and the arc extinguishing chamber 400 is arranged below the crank arm 500, and an insulating pull rod is provided between the arc extinguishing chamber 400 and the crank arm 500. 600, one end of the insulating pull rod 600 is hinged to the crank arm 500, and the other end can move up and down with the rotation of the crank arm 500 to approach or move away from the arc extinguishing chamber 400, thereby realizing the closing or opening operation, wherein, the energy storage component 700 is provided on a section of the switch main shaft 300 close to the crank arm 500, and the switch main shaft 300 drives the insulating pull rod 600 to move downward through the crank arm 500 and compresses the energy storage component 700, that is, when closing, the operating mechanism 20 0 drives the switch main shaft 300 to rotate, and then drives the crank arm 500 to rotate to drive the insulating pull rod 600 to move downward. At this time, the energy storage component 700 is compressed; when opening the switch, the energy storage component 700 releases energy to pull the crank arm 500 to reverse, driving the insulating pull rod 600 to move upward to achieve opening. At this time, the energy storage component 700 transfers energy to the insulating pull rod 600 through the crank arm 500, reducing energy transmission loss and ensuring the stability of the opening operation.

[0022] In some embodiments, reference Figure 1 and Figure 2As shown, the inflatable cabinet circuit breaker is used in a three-phase circuit, so three crank arms 500 are arranged at intervals on the switch main shaft 300. The three crank arms 500 can be fixedly arranged on the switch main shaft 300 through the sleeve 301, and the insulating pull rod 600 and the arc extinguishing chamber 400 each have three and are respectively arranged corresponding to the three crank arms 500; wherein, the energy storage components 700 are two and are arranged at both ends of the switch main shaft 300. The purpose of this design is not only to reduce the loss of energy transfer, but also to ensure the balance of energy transfer on the switch main shaft 300, so that the crank arm 500 away from the operating mechanism 200 also has sufficient energy to drive the insulating pull rod 600 to move upward to achieve opening; further, the two energy storage components 700 are arranged opposite each other for the purpose of improving the space utilization rate in the base 100, and can further ensure that the energy of the three crank arms 500 on the switch main shaft 300 is evenly distributed, thereby ensuring that the three insulating pull rods 600 can move upward at the same time to achieve opening.

[0023] In some embodiments, reference Figures 1 to 3 As shown, the energy storage assembly 700 includes a torsion spring sleeved on the switch main shaft 300, a limiting rod 101 is provided on the base 100, and a rotating rod 501 is provided on the crank arm 500. The two torsion arms of the torsion spring respectively abut the limiting rod 101 and the rotating rod 501. When the rotating rod 501 rotates with the crank arm 500, it can compress the torsion arm of the torsion spring, thereby storing energy; specifically, the limiting rod 101 is an axis protruding toward the direction close to the torsion spring and provided on the base 100, and the rotating rod 501 is an axis protruding toward the direction close to the torsion spring and provided on the crank arm 500. The two torsion arms of the torsion spring respectively abut or press the rotating rod 501 and the limiting rod 101.

[0024] In some embodiments, reference Figure 3 As shown, an arcuate bend 701 is provided on the torsion arm of the torsion spring abutting the rotating rod 501. The arcuate bend 701 can be hooked on the rotating rod 501 to prevent the torsion arm of the torsion spring from falling off the rotating rod 501 during use, thereby ensuring the mechanical stability of the circuit breaker. Furthermore, an arcuate bend 701 is also provided on the torsion arm of the torsion spring abutting the limit rod 101, the purpose of which is to ensure that the torsion spring does not fall off the limit rod 101 during use, thereby ensuring the mechanical stability of the circuit breaker.

[0025] In some embodiments, reference Figure 1 and Figure 2As shown, an intermediate block 502 is provided between the crank arm 500 and the insulating rod 600, the intermediate block 502 is hinged to the crank arm 500, and a mounting hole 503 is provided on the intermediate block 502, one end of the insulating rod 600 passes through the mounting hole 503 and is fixedly connected to the intermediate block 502, that is, the crank arm 500 drives the insulating rod 600 to move vertically up and down through the intermediate block 502; further, a guide plate 401 is provided between the insulating rod 600 and the arc extinguishing chamber 400, and a guide hole 402 is provided on the guide plate 401, the lower end of the insulating rod 600 can pass through the guide hole 402 to approach or move away from the arc extinguishing chamber 400, and the guide hole 402 is used to ensure that the insulating rod 600 moves vertically up and down.

[0026] It should be noted that the crank arm 500 and / or the base 100 may be provided with a through hole, and the torsion arm of the torsion spring may be provided through the through hole.

[0027] In some embodiments, the switch main shaft 300 is made of 45 steel material, and the use of 45 steel material instead of traditional glass fiber improves the wear resistance and strength of the switch main shaft 300, overcomes the shortcomings of easy deformation and short life of the original glass fiber, and can solve the disadvantage of unqualified size caused by shrinkage of production materials.

[0028] In some embodiments, the insulating pull rod 600 is made of SMC composite material. SMC composite material stands for sheet molding compound. Its primary raw materials include GF (specialized yarn), UP (unsaturated resin), low-shrinkage additives, MD fillers, and various additives. This SMC composite material exhibits excellent electrical insulation, mechanical properties, thermal stability, and chemical resistance.

[0029] It should be noted that the crank arm 500 can adopt a two-piece structure, and the two-piece crank arm 500 is fastened together by a pin or a pin shaft, the middle block 502 is clamped in the two-piece crank arm 500, and is hinged to the crank arm 500 through a rotating shaft.

[0030] It should be noted that the switch main shaft 300 can adopt a columnar structure with a polygonal cross-section, and the polygonal outer surface drives the crank arm 500 to rotate with the switch main shaft 300, and the two adjacent crank arms 500 are newly spaced apart by the sleeve 301. The length of the sleeve 301 can be set according to actual needs, thereby setting the distance between the two adjacent crank arms 500, and it has wide applicability.

[0031] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A gas cabinet circuit breaker, characterized in that: include: base; A switch main shaft is provided on the base, one end of which is connected to an operating mechanism, and the switch main shaft can be driven by the operating mechanism to rotate along its own axis; An arc extinguishing chamber, arranged below the switch main shaft; A crank arm is provided on the switch main shaft and is capable of rotating along with the switch main shaft; An insulating pull rod, one end of which is hinged to the crank arm, and the other end of which can move up and down with the rotation of the crank arm to move closer to or away from the arc extinguishing chamber; Wherein, an energy storage component is provided on a section of the switch main shaft close to the crank arm, and the switch main shaft drives the insulating pull rod to move downward and compress the energy storage component through the crank arm; The energy storage assembly includes a torsion spring sleeved on the switch main shaft, a limit rod is provided on the base, and a rotation rod is provided on the crank arm. The two torsion arms of the torsion spring respectively abut against the limit rod and the rotation rod, and the rotation rod compresses the torsion arm of the torsion spring as the crank arm rotates; An intermediate block is provided between the crank arm and the insulating pull rod, the intermediate block is hinged to the crank arm, a mounting hole is provided on the intermediate block, one end of the insulating pull rod passes through the mounting hole and is fixedly connected to the intermediate block; A guide plate is provided between the insulating pull rod and the arc extinguishing chamber. A guide hole is provided on the guide plate. The insulating pull rod can pass through the guide hole to approach or move away from the arc extinguishing chamber.

2. The gas cabinet circuit breaker according to claim 1, characterized in that: An arc-shaped bent portion is provided on the torsion arm of the torsion spring abutting against the rotating rod.

3. The gas cabinet circuit breaker according to claim 1, characterized in that: The switch main shaft is made of 45 steel material.

4. A gas cabinet circuit breaker according to claim 1 or 3, characterized in that: The insulating pull rod is made of SMC composite material.

5. The gas cabinet circuit breaker according to claim 1, characterized in that: There are three crank arms and they are spaced apart on the switch main shaft. There are three insulating pull rods and three arc extinguishing chambers and they are respectively arranged corresponding to the three crank arms.

6. The gas cabinet circuit breaker according to claim 5, characterized in that: There are two energy storage components, which are respectively arranged at two ends of the switch main shaft.

7. The gas cabinet circuit breaker according to claim 6, characterized in that: The two energy storage components are arranged opposite to each other.

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