CN212874360U

CN212874360U - Pneumatic protection device for circuit breaker

Info

Publication number: CN212874360U
Application number: CN202021228419.XU
Authority: CN
Inventors: 赵瑞峰; 刘俭; 乐莺
Original assignee: Shanghai Electric Co ltd People Electric Factory
Current assignee: Shanghai Electric Co ltd People Electric Factory
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2021-04-02
Anticipated expiration: 2030-06-29

Abstract

The utility model relates to a pneumatic protection device for circuit breaker, including base (1), connecting rod (2), spring (3), slider (4) and circuit breaker casing (5), base (1) on be equipped with three relatively independent muscle: muscle a (11), muscle b (14) and muscle c (16), three muscle enclose into two independent cavitys with base (1) together: the cavity body a (13) and the cavity body b (15), a sliding block (4) is arranged in each cavity body, and the sliding block (4) moves in the cavity body to push the connecting rod (2) to move. Compared with the prior art, the utility model has the advantages of the security is high.

Description

Pneumatic protection device for circuit breaker

Technical Field

The utility model relates to a circuit breaker especially relates to pneumatic protection device for circuit breaker.

Background

In the working process of the circuit breaker, when a short-circuit fault occurs to a certain phase, timely and rapid tripping is required, the tripping process is usually realized by triggering a tripping mechanism through an external linkage mechanism, various triggering modes exist in the prior art to drive the tripping mechanism, and the tripping is realized in a gas protection mode.

Chinese patent publication No. CN105185669A discloses a gas protection device for a circuit breaker. The circuit breaker comprises closed cavities arranged on the outer sides of all phase shells of the circuit breaker, sliding seats are arranged in the closed cavities, the sliding seats and the inner walls of the closed cavities are in sliding fit to form a piston structure, vent holes positioned below the sliding seats are arranged on the closed cavities, contacts are arranged in all the phase shells, and the vent holes penetrate through one of the phase shells to be communicated with a working cavity of the phase contact; the upper end of the sliding seat is connected with a push rod, the upper end of the push rod extends out of the closed cavity and can move up and down under the driving of the sliding seat, each phase of shell is provided with a tripping mechanism, and the push rod can trigger the tripping mechanism. After adopting above-mentioned structure, in case there is one phase to take place short-circuit current and produce the air current, thereby in order to generate heat the gaseous tripping action of accomplishing through push rod drive trigger mechanism in the gas promotion slide that produces through short-circuit current, realize the switch separating brake, its structural design is simple ingenious, small in size and simple to operate, and the leakproofness is very good simultaneously, has improved the reliability of action greatly. However, the gas protection device of the circuit breaker is not an independent device, and a closed cavity is formed by the aid of the phase shells on two sides, so that the replaceability of the gas protection device is poor. The gas thrust required for the up-and-down sliding movement is large, and therefore, the motion sensitivity is poor.

Chinese patent publication No. CN106601561B discloses a rotary pneumatic protection device for a molded case circuit breaker, which is disposed between two adjacent phase contacts of the circuit breaker when in use, the phase contacts are provided with a tripping mechanism and a draw bar, the draw bar can trigger the tripping mechanism, the rotary pneumatic protection device comprises a main housing, a cover plate, a rotary press rod and a sliding ejector rod, the main housing and the cover plate are tightly connected to form a closed cavity, the main shell and the cover plate are respectively provided with a vent hole which is used for communicating with the adjacent phase contact working cavity, the rotary pressure rod is arranged in the closed cavity and is pushed by air flow to rotate, the sliding ejector rod is arranged in the main shell, the upper end of the main shell extends out of the main shell, the lower end of the main shell is in contact with the rotating pressure rod, the sliding ejector rod is restricted by the main shell structure and can only slide up and down, and the rotating pressure rod drives the sliding ejector rod to move upwards when rotating to push the traction rod to rotate so as to trigger the tripping mechanism to trip. The structure is independent and sensitive in action, but the core of the structure is designed into a rotary pressure rod with a special curved surface, and in the process of contact and long-term use of the push rod, the curved surface characteristics are easy to lose, so that the sensitivity is poor, the service life is reduced, and the stroke and the stress of the push rod are difficult to control.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a pneumatic protection device for circuit breaker with high safety in order to overcome the defects of the prior art.

The purpose of the utility model can be realized through the following technical scheme: pneumatic protection device for circuit breaker, including base, connecting rod, spring, slider and circuit breaker casing, its characterized in that, the base on be equipped with three relatively independent muscle: muscle a, muscle b and muscle c, three muscle enclose into two independent cavitys with the base together: the cavity body a and cavity body b, every cavity is equipped with a slider in it, and the slider moves in the cavity body and promotes the connecting rod motion.

The circuit breaker housing comprises two independent housings: the air conditioner comprises a shell a and a shell b, wherein a groove a is formed in the shell a, and a vent hole a is formed in the groove a; and a groove b is formed in the shell b, and a vent hole b is formed in the groove b.

The shell a and the shell b are respectively covered on the base and seal the cavity a and the cavity b together with the sliding block to form an independent cavity, wherein the cavity a is communicated with the vent hole a, and the cavity b is communicated with the vent hole b.

The rib a, the rib b and the rib c are arranged in parallel, one end of the rib a is provided with a connecting rib which connects the three ribs into a whole, the connecting rib and the three ribs form an E-shaped structure, and the sliding block is arranged in two openings of the E-shaped structure.

The slider be the U type form of placing horizontally, in the open end inserted E type structure, blind end top is protruding, and the protruding connecting rod motion of top promotes at the gliding in-process of slider, triggers the unhook.

And two side walls of the sliding block are in sealing contact with the side wall of the E-shaped structure.

The base on be equipped with connecting rod fixed axle and spring mount pad, the connecting rod center set up the centre bore, fix on the connecting rod fixed axle, and be equipped with the spacing muscle of arc in connecting rod fixed axle both sides, the connecting rod can be at the cavity internal rotation that two spacing muscle of arc enclose, the spacing muscle of arc is received to the maximum range of pivoted simultaneously and is controlled.

One end of the spring is fixedly arranged on the spring mounting seat, the other end of the spring is a free end, and the spring can be in contact with the connecting rod in the rotating process of the connecting rod and can help the connecting rod to reset through spring force after being compressed.

The spring and the sliding block are respectively positioned at two sides of the lower part of the connecting rod, and the sliding block pushes the connecting rod to rotate around the connecting rod fixing shaft, compresses the spring, triggers the tripping mechanism and can reset under the action of the spring.

Compared with the prior art, the utility model has the advantages of it is following:

(1) the utility model discloses a three independent muscle have enclosed into two independent closed cavitys with casing, slider together on the base, wholly constitute airtight assembly, set up the cavity of installation connecting rod and spring on the base, and each subassembly can independently assemble.

(2) The utility model discloses a supply two independent closed chamber that electric arc got into, wherein each cavity is equipped with an air vent respectively, be used for with two independent casings on the air vent intercommunication, thereby communicate with each other airtight cavity with control double-phase adjacent phase contact working chamber, consequently, when short-circuit fault takes place in the circuit, will produce electric arc in the working chamber, because electric arc produces and the high temperature high-pressure gas that generates will get into airtight cavity through corresponding air vent, promote the slider and remove, drive the connecting rod and trigger tripping device, the security of product has been promoted.

(3) The utility model discloses a two sliders, the design of two sealed cavitys respectively, when single-phase trouble takes place in the circuit, the high temperature high-pressure gas that produces in the work cavity gets into the seal chamber who corresponds, promotes the slider, further accomplishes the dropout operation. When two-phase and three-phase short circuit faults exist in the circuit, high-temperature and high-pressure gas can enter the sealing cavity respectively, and the tripping operation is finished simultaneously. Because the voltage of each phase in the circuit is different, the arc voltage generated in each phase working cavity is also different, and the safety of the product is further improved by adopting the design of two sealed cavities.

(4) The utility model discloses a slider promotes even operation of threading off, and the slider only is the side-to-side motion, drives the connecting rod and rotates, and the slider top surface becomes circular-arcly, and the great wearing and tearing of area of contact between the connecting rod are less, consequently adopt pneumatic means's stroke and atress all controllable.

(5) The utility model discloses the last recess that has of circuit breaker subassembly, the outstanding muscle is sealed in the recess on the pneumatic trip gear base, the utility model discloses utilize the circuit breaker subassembly recess to constitute seal chamber for the blowing mechanism can accomplish littleer, and the blowing miniaturization is better.

Drawings

FIG. 1 is a schematic view of the internal structure of the device of the present invention;

FIG. 2 is a schematic view of the base structure of the present invention;

FIG. 3 is a schematic view of the overall structure of the device of the present invention;

fig. 4 is another schematic overall structure of the device of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in fig. 1-4, the pneumatic protection device for the circuit breaker comprises a base 1, a connecting rod 2, a spring 3, a sliding block 4 and a circuit breaker shell 5, wherein the base 1 is provided with three relatively independent ribs: rib a11, rib b14 and rib c16, which enclose two independent cavities with the base 1: the cavity a13 and the cavity b15 are provided with a slide block 4 in each cavity, and the slide block 4 moves in the cavity to push the connecting rod 2 to move.

The circuit breaker housing 5 comprises two separate housings: the device comprises a shell a51 and a shell b52, wherein a groove a511 is formed in the shell a51, and a vent hole a512 is formed in the groove a 511; a groove b521 is arranged on the shell b52, and a vent hole b522 is arranged in the groove b 521. The shell a51 and the shell b52 are respectively covered on the base 1, and together with the slider 4, the cavity a13 and the cavity b15 are sealed to form an independent chamber, wherein the cavity a13 is communicated with the vent hole a512, and the cavity b15 is communicated with the vent hole b 522.

The rib a11, the rib b14 and the rib c16 are arranged in parallel, one end of the rib is provided with a connecting rib which connects the three ribs into a whole, the connecting rib and the three ribs form an E-shaped structure, and the sliding block 4 is arranged in two openings of the E-shaped structure. The slider 4 be the U type form of placing horizontally, in the open end inserted E type structure, the blind end top is protruding, and the protruding connecting rod 2 motion of top promotion in the gliding in-process of slider 4 triggers the unhook. And two side walls of the sliding block 4 are in sealing contact with the side wall of the E-shaped structure.

The base 1 on be equipped with connecting rod fixed axle 18 and spring mount 17, connecting rod 2 center set up the centre bore, fix on connecting rod fixed axle 18, and be equipped with the spacing muscle of arc in connecting rod fixed axle both sides, the connecting rod can be at the cavity internal rotation that two spacing muscle of arc enclose, the spacing muscle control of arc is received to the maximum range of pivoted simultaneously. One end of the spring 3 is fixedly arranged on the spring mounting seat 17, the other end of the spring is a free end, and the spring can be contacted with the connecting rod in the rotating process of the connecting rod and can help the connecting rod to reset through spring force after being compressed. The spring 3 and the sliding block 4 are respectively positioned at two sides of the lower part of the connecting rod 2, the sliding block 4 pushes the connecting rod 2 to rotate around the connecting rod fixing shaft 18, the spring 3 is compressed, the tripping mechanism is triggered, and the tripping mechanism can reset under the action of the spring 3.

Claims

1. Pneumatic protection device for circuit breaker, including base (1), connecting rod (2), spring (3), slider (4) and circuit breaker casing (5), its characterized in that, base (1) on be equipped with three relatively independent muscle: muscle a (11), muscle b (14) and muscle c (16), three muscle enclose into two independent cavitys with base (1) together: the cavity body a (13) and the cavity body b (15), a sliding block (4) is arranged in each cavity body, and the sliding block (4) moves in the cavity body to push the connecting rod (2) to move.

2. The pneumatic circuit breaker protection device according to claim 1, characterized in that said circuit breaker housing (5) comprises two independent housings: the device comprises a shell a (51) and a shell b (52), wherein a groove a (511) is formed in the shell a (51), and a vent hole a (512) is formed in the groove a (511); the shell b (52) is provided with a groove b (521), and a vent hole b (522) is arranged in the groove b (521).

3. The pneumatic protection device for the circuit breaker according to claim 2, wherein the housing a (51) and the housing b (52) are respectively covered on the base (1) and are used together with the slider (4) to seal the cavity a (13) and the cavity b (15) to form independent chambers, wherein the cavity a (13) is communicated with the vent hole a (512), and the cavity b (15) is communicated with the vent hole b (522).

4. The pneumatic protection device for the circuit breaker according to claim 1, wherein the rib a (11), the rib b (14) and the rib c (16) are arranged in parallel, one end of the rib is provided with a connecting rib which connects the three ribs into a whole, the connecting rib and the three ribs form an E-shaped structure, and the sliding block (4) is arranged in two openings of the E-shaped structure.

5. The pneumatic protection device for the circuit breaker according to claim 4, wherein the sliding block (4) is in a U shape horizontally placed, the open end of the sliding block is inserted into the E-shaped structure, the top of the sliding block is protruded at the closed end, and the top of the sliding block is protruded to push the connecting rod (2) to move during the sliding process of the sliding block (4) so as to trigger unhooking.

6. The pneumatic protection device for circuit breakers according to claim 5, characterized in that the two lateral walls of said slider (4) are in sealing contact with the lateral walls of the E-shaped structure.

7. The pneumatic protection device for the circuit breaker according to claim 1, wherein the base (1) is provided with a connecting rod fixing shaft (18) and a spring mounting seat (17), the connecting rod (2) is fixed on the connecting rod fixing shaft (18), and the spring (3) is mounted on the spring mounting seat (17).

8. The pneumatic protection device for the circuit breaker according to claim 7, wherein the spring (3) and the slider (4) are respectively located at two sides of the lower portion of the connecting rod (2), and the slider (4) pushes the connecting rod (2) to rotate around the connecting rod fixing shaft (18), so that the spring (3) is compressed, the tripping mechanism is triggered, and the tripping mechanism can be reset under the action of the spring (3).