CN113871261A - Pneumatic protection device of molded case circuit breaker - Google Patents

Abstract

The invention relates to a pneumatic protection device of a molded case circuit breaker, which comprises a base (1), a spring (2), an ejector rod (3), a sliding block (4) and a cover plate (5), wherein three relatively independent ribs are arranged on the base (1): muscle a (11), muscle b (13) and muscle c (16), three muscle enclose into two independent cavitys with base (1) together: cavity a (12) and cavity b (14), slider (4) be triangle-shaped, its top surface (41) and ejector pin (3) contact, be equipped with spout (43) between two stabilizer blades of lower part, muscle b (13) insert in spout (43), make slider (4) reciprocate along muscle b (13), two stabilizer blades are arranged in cavity a (12) and cavity b (14) respectively. Compared with the prior art, the invention has the advantages of controllable stress, high safety and the like.

Description

Pneumatic protection device of molded case circuit breaker

Technical Field

The invention relates to a circuit breaker, in particular to a pneumatic protection device of a molded case 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.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide the pneumatic protection device of the molded case circuit breaker with controllable stress and high safety.

The purpose of the invention can be realized by the following technical scheme: the utility model provides a moulded case circuit breaker pneumatic protection device, includes base, spring, ejector pin, slider and apron, 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 sliding block is in a triangular shape, the top surface of the top of the sliding block is in contact with the ejector rod, a sliding groove is formed between the two support legs at the lower part, the rib b is inserted into the sliding groove, the sliding block is enabled to move up and down along the rib b, and the two support legs are respectively arranged in the cavity a and the cavity b.

The base is provided with a vent hole a, and the vent hole a is positioned in the cavity b.

The cover plate covers the base, the cavity a and the cavity b are sealed to form an independent cavity, and the cover plate is provided with a vent hole b which is communicated with the cavity a.

The cover plate is provided with pins which are inserted into base holes on the base to form a closed assembly.

The ejector rod comprises a fixed block and two side support legs, wherein a rotating shaft is arranged on the fixed block, a pin a and a pin b are respectively arranged on the two support legs, and two ends of the rotating shaft are respectively inserted into a shaft hole a arranged on the cover plate and a shaft hole b arranged on the base, so that the ejector rod rotates around the base and the cover plate.

The pin a is cylindrical and inserted into the lower part of the spring, the upper part of the spring is fixed on the base, the top surface of the sliding block is abutted to one support leg of the ejector rod, the support leg is pushed to compress the spring, the ejector rod rotates around the rotating shaft, and the pin b is driven to trigger the tripping mechanism.

And a pin c is arranged on the base, and the upper part of the spring is inserted into the pin c.

The outer sides of the two supporting feet of the sliding block are respectively contacted with the rib a and the rib c, the contact surfaces are arc surfaces, the middle of the two supporting feet is respectively contacted with the rib b, and the bottom contact angle is arc-shaped, so that the friction force of the sliding block in the moving process is small.

Compared with the prior art, the invention has the following advantages:

(1) the invention adopts three independent ribs on the base and the cover plate to form a closed assembly, a cavity for installing the ejector rod and the spring is arranged on the base above the closed assembly, and each component can be independently assembled.

(2) The invention designs two independent closed cavities for electric arcs to enter, wherein each cavity is respectively provided with a vent hole for communicating with the adjacent phase contact working cavity, and one vent hole is arranged on the ground base and the other vent hole is arranged on the top cover plate, so that when a circuit fails in the bottom adjacent working cavity or the top adjacent working cavity, a high-temperature and high-pressure conductive electric arc can be generated in the circuit, the electric arc can enter the sealed cavity through the two vent holes to push the sliding block to move, the ejector rod is driven to trigger the tripping mechanism, and the safety of a product is improved.

(3) The invention adopts gas at two sides to push the same slide block: the slider is three horn structures, falls into top connecting block and both sides stabilizer blade, and the both sides stabilizer blade is located two sealed cavities respectively, and can follow middle muscle and reciprocate, and the gas in two cavities can promote same slider simultaneously and reciprocate, and is more steady, and sensitivity is higher.

(4) The invention adopts the sliding block to push the ejector rod to carry out tripping operation, the sliding block only moves up and down to drive the ejector rod to rotate, the top surface of the sliding block is in an arc shape, the contact area between the sliding block and the ejector rod is larger, the abrasion is smaller, and therefore, the stroke and the stress of the pneumatic device are controllable.

Drawings

FIG. 1 is a schematic view of the cover plate of the apparatus of the present invention;

FIG. 2 is a schematic view of the combination of the base and the cover;

FIG. 3 is a schematic view of a base structure;

FIG. 4 is a schematic view of a cover plate structure;

FIG. 5 is a schematic view of the structure of the lift pin;

fig. 6 is a schematic view of a slider structure.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Example 1

As shown in fig. 1, the pneumatic protection device for the molded case circuit breaker comprises a base 1, a spring 2, a top rod 3, a sliding block 4 and a cover plate 5.

Wherein, base 1, as shown in fig. 3, including the accommodation space that airtight cavity and its top set up, airtight cavity constitute by bottom base plate, top apron and three inside relatively independent muscle, wherein three relatively independent muscle are: rib a11, rib b13 and rib c16, which enclose two independent cavities with the base 1: cavity a12 and cavity b 14. The base 1 is provided with a vent a15, the vent a12 is located in the cavity b 14. The containing space is used for installing the top rod 3 and the spring 2 and is internally provided with a shaft hole b17, a pin c18 and a base hole 19.

As shown in fig. 4, the cover plate 5 is covered on the base 1, the cavity a12 and the cavity b14 are sealed to form an independent chamber, and the cover plate 5 is provided with a vent hole b51, and the vent hole b51 is communicated with the cavity a 12. The cover 5 has pins 53, and the pins 53 are inserted into the base holes 19 of the base to fix the cover 5 to the base 1, thereby forming a closed assembly. As shown in fig. 2.

As shown in fig. 5, the lift pin 3 includes a fixed block and two side legs, wherein the fixed block is provided with a rotating shaft 32, the two legs are respectively provided with a pin a31 and a pin b33, and two ends of the rotating shaft 32 are respectively inserted into a shaft hole a52 provided on the cover plate 5 and a shaft hole b17 provided on the base 1, so that the lift pin 3 rotates around the base 1 and the cover plate 5. The pin a31 is cylindrical and inserted into the lower part of the spring 2, the upper part of the spring 2 is inserted into the pin c18 of the base 1, the top surface 41 of the slide block 4 abuts against one support leg of the mandril 3 and pushes the support leg to compress the spring 2, so that the mandril 3 rotates around the rotating shaft 32 to drive the pin b33 to trigger the tripping mechanism.

As shown in fig. 6, the slider 4 is triangular, the top surface 41 of the slider contacts with the top rod 3, a sliding slot 43 is arranged between the two lower legs, the rib b13 is inserted into the sliding slot 43, so that the slider 4 moves up and down along the rib b13, and the two legs are respectively arranged in the cavity a12 and the cavity b 14. The outer sides of the two support legs of the sliding block 4 are respectively contacted with the rib a11 and the rib c16, the contact surface 42 is an arc surface, the middle of the two support legs is respectively contacted with the rib b13, and the bottom contact angle 44 is arc-shaped, so that the friction force of the sliding block in the moving process is small.

When the circuit breaks down, a high-temperature and high-pressure conductive arc can be generated in the circuit, the arc enters the sealed cavity (the cavity a12 and the cavity b14) through the vent hole a15 and the vent hole b51, the sliding block 4 is pushed to move, and the ejector rod 3 is pushed to complete the tripping action.

Claims (8)

1. The utility model provides a moulded case circuit breaker pneumatic protection device, includes base (1), spring (2), ejector pin (3), slider (4) and apron (5), its characterized in that, base (1) on be equipped with three relatively independent muscle: muscle a (11), muscle b (13) and muscle c (16), three muscle enclose into two independent cavitys with base (1) together: cavity a (12) and cavity b (14), slider (4) be triangle-shaped, its top surface (41) and ejector pin (3) contact, be equipped with spout (43) between two stabilizer blades of lower part, muscle b (13) insert in spout (43), make slider (4) reciprocate along muscle b (13), two stabilizer blades are arranged in cavity a (12) and cavity b (14) respectively.

2. The pneumatic protection device for the molded case circuit breaker according to claim 1, wherein the base (1) is provided with a vent hole a (15), and the vent hole a (12) is located in the cavity b (14).

3. The pneumatic protection device for the molded case circuit breaker according to claim 1, wherein the cover plate (5) covers the base (1) to seal the cavity a (12) and the cavity b (14) to form an independent chamber, and a vent hole b (51) is formed in the cover plate (5), and the vent hole b (51) is communicated with the cavity a (12).

4. A pneumatic protection device for molded case circuit breakers in accordance with claim 1 or 3, wherein said cover plate (5) has pins (53), said pins (53) being inserted into base holes (19) formed in the base to form a closed assembly.

5. The pneumatic protection device for the molded case circuit breaker according to claim 1, wherein the push rod (3) comprises a fixed block and two side legs, wherein the fixed block is provided with a rotating shaft (32), and the two legs are respectively provided with a pin a (31) and a pin b (33), wherein two ends of the rotating shaft (32) are respectively inserted into the shaft hole a (52) formed in the cover plate (5) and the shaft hole b (17) formed in the base (1), so that the push rod (3) rotates around the base (1) and the cover plate (5).

6. The pneumatic protection device for the molded case circuit breaker according to claim 5, wherein the pin a (31) is cylindrical and inserted into the lower portion of the spring (2), the upper portion of the spring (2) is fixed on the base (1), the top surface (41) of the slider (4) abuts against one leg of the push rod (3) and pushes the one leg to compress the spring (2), so that the push rod (3) rotates around the rotating shaft (32) to drive the pin b (33) to trigger the trip mechanism.

7. The pneumatic protection device for the molded case circuit breaker according to claim 6, wherein the base (1) is provided with a pin c (18), and the upper portion of the spring (2) is inserted into the pin c (18).

8. The pneumatic protection device for the molded case circuit breaker according to claim 1, wherein the outer sides of the two legs of the slider (4) are respectively contacted with the rib a (11) and the rib c (16), the contact surface (42) is a circular arc surface, the middle of the two legs is respectively contacted with the rib b (13), and the bottom contact angle (44) is circular arc.

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