CN115312351A - Inside high temperature early warning protection device of vacuum circuit breaker - Google Patents

Abstract

The invention relates to the technical field of circuit breakers, and discloses an internal high-temperature early warning protection device for a vacuum circuit breaker, which includes a circuit breaker outer shell, and ventilation plates are fixedly installed on the left and right sides of the circuit breaker outer shell, and the ventilation plates are provided with ventilation plates. Ventilation holes, the left and right sides of the circuit breaker outer casing are fixedly installed with an outer box body, and a positioning plate is fixedly installed inside the outer box body, two positioning plates are arranged in the outer box, and the inner sides of the two positioning plates are slidably connected There are bezels. When the high temperature warning protection device inside the vacuum circuit breaker is in use, when the temperature of the device box is too high, the heat will be transferred to the inside of the air bag box through the conductive sheet, and the resistance value of the sliding varistor sheet in the access line will become smaller. The relationship of the resistance shows that the current connected to the sliding varistor increases at this time, and the magnets at both ends of the first solenoid attract the magnetic blocks to drive the slider and the connecting rod to move, and then drive the baffle to leave the outside of the vent plate, so that the circuit breaker Internal heat dissipation is possible.

Description

A high temperature warning and protection device inside a vacuum circuit breaker

technical field

The invention relates to the technical field of circuit breakers, in particular to a high temperature early warning protection device inside a vacuum circuit breaker.

Background technique

Vacuum circuit breaker is named for its arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are both high vacuum; it has the advantages of small size, light weight, suitable for frequent operation, and no maintenance for arc extinguishing. The application is more popular in China. The vacuum circuit breaker is an indoor power distribution device in a 3-10kV, 50Hz three-phase AC system. It can be used for the protection and control of electrical equipment in industrial and mining enterprises, power plants, and substations, especially for the requirements In places where there is no oil, less maintenance and frequent operations, circuit breakers can be installed in central cabinets, double-layer cabinets and fixed cabinets to control and protect high-voltage electrical equipment. It affects the use of internal components, and in severe cases, it will cause damage to internal components. For this reason, a high-temperature early warning protection device inside a vacuum circuit breaker is proposed.

Contents of the invention

(1) Solved technical problems

Aiming at the deficiencies of the prior art, the present invention provides a high-temperature early warning and protection device inside a vacuum circuit breaker, which has the advantage of automatically generating power-off protection when the internal temperature of the circuit breaker is too high, and solves the problems that occur when the existing circuit breaker is in use. High temperature will affect the use of internal components, and in serious cases will cause damage to internal components.

(2) Technical solution

In order to achieve the above object, the present invention provides the following technical solution: a high temperature early warning and protection device inside a vacuum circuit breaker, including a circuit breaker outer shell, and the left and right sides of the circuit breaker outer shell are fixedly installed with gas-permeable panels. Ventilation holes are opened on the ventilating plate, the outer box is fixedly installed on the left side and the right side of the outer box of the circuit breaker, and a positioning plate is fixedly installed inside the outer box, and the positioning plate is fixed on the outer box There are two positioning plates in the body, and the inner sides of the two positioning plates are slidably connected with baffle plates.

Preferably, a solenoid is fixedly connected to the side of the outer box away from the air-permeable plate, and a slider and a magnetic block are fixedly connected to the side of the solenoid away from the inner wall of the outer box. A first spring is arranged on the outside, and a connecting rod is fixedly connected to the side of the slider away from the solenoid.

Preferably, a device box is arranged inside the outer casing of the circuit breaker, and a protection box is fixedly installed above the device box.

Preferably, a second solenoid is fixedly installed on the inner top of the protection box, and a second spring is provided on the left side and the right side of the second solenoid, and the end of the second spring is away from the inner wall of the protection box The first tooth plate is fixedly connected.

Preferably, the outer side of the first tooth plate is meshed with a drive gear, the side of the drive gear away from the drive gear is meshed with a second tooth plate, and the end of the second tooth plate is far away from the inner wall of the protection box A conductive block is fixedly connected, and an electric circuit is arranged inside the protective box.

Preferably, an airbag box is provided below the device box, a heat conduction sheet is fixedly connected between the device box and the airbag box, an elastic bag is arranged inside the airbag box, and a conductive sheet is fixedly connected to the lower end of the elastic bag. trachea.

Preferably, the right end of the air guide tube is fixedly connected with a sealing cylinder, the inside of the sealing cylinder is slidably connected with a piston block, the left side of the piston block is fixedly connected with a third spring, and the left side of the third spring is connected to the The inner wall of the sealing cylinder is fixedly connected.

Preferably, the right side of the piston block is fixedly connected with a connecting rod, the right end of the connecting rod is fixedly installed with a conductive column, and a sliding rheostat is arranged under the conductive column, the first solenoid, the second solenoid The line pipes are electrically connected with the sliding rheostat.

Compared with the prior art, the present invention provides a high temperature warning and protection device inside a vacuum circuit breaker, which has the following beneficial effects:

1. When the internal high temperature warning protection device of the vacuum circuit breaker is in use, when the temperature of the device box is too high, the heat will be transferred to the inside of the airbag box through the conductive sheet, and the internal air will expand when the elastic bag inside the airbag box is heated. Entering the sealing cylinder through the air duct, the gas in the sealing cylinder will push the piston block to move, the piston block drives the connecting rod and the conductive column to move to the right, and the conductive column moves to the right on the sliding rheostat, so that the sliding rheostat is connected to the line According to the relationship between current and resistance, it can be seen that the current connected to the sliding rheostat increases at this time, so that the current connected to the first solenoid and the second solenoid increases, and the first solenoid The magnetism at both ends of the wire tube attracts the magnetic block to drive the slider and the connecting rod to move, and then drives the baffle to leave the outside of the vent plate, so that the inside of the circuit breaker can dissipate heat.

2. The internal high temperature warning and protection device of the vacuum circuit breaker, and the magnetic attraction of the second solenoid attracts the small iron piece connected to the first tooth plate to drive the first tooth plate to move, and the first tooth plate moves to drive The gear rotates, and when the driving gear rotates, it drives the second tooth plate to move, and when the second tooth plate moves, it drives the conductive block to approach each other. When the two conductive blocks are close to each other and contact the energized line, the line will be short-circuited, resulting in excessive heat. At this time, the internal current of the circuit breaker no longer passes through the components, thereby protecting the internal components of the circuit breaker from damage.

Description of drawings

Fig. 1 is a schematic front sectional view of the structure of the present invention;

Fig. 2 is a schematic diagram of the internal structure of the protection box of the present invention;

Fig. 3 is a schematic diagram of the internal structure of the outer box of the present invention;

Fig. 4 is the enlarged schematic diagram of area B in Fig. 2 of the present invention;

FIG. 5 is an enlarged schematic diagram of area A in FIG. 3 of the present invention.

Among them: 100, the outer casing of the circuit breaker; 101, the ventilation plate; 102, the ventilation hole; 200, the outer box; 201, the positioning plate; 202, the baffle; 300, the first solenoid; 301, the slider; 302, Magnetic block; 303, first spring; 304, connecting rod; 400, device box; 500, protection box; 501, second solenoid; 502, second spring; 503, first tooth plate; 504, driving gear ; 505, the second tooth plate; 506, conductive block; 507, energized circuit; 600, air bag box; 601, elastic bag; 602, air guide tube; 700, sealing cylinder; 701, piston block; 702, the third spring; 703, connecting rod; 704, conductive column; 705, sliding rheostat.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Figures 1-5, a high temperature warning and protection device inside a vacuum circuit breaker, which includes a circuit breaker outer shell 100, and the left and right sides of the circuit breaker outer shell 100 are fixedly installed with a ventilating plate 101, and the ventilating plate Ventilation holes 102 are opened on 101, the outer box body 200 is fixedly installed on the left side and the right side of the outer box body 100 of the circuit breaker, and a positioning plate 201 is fixedly installed inside the outer box body 200, and the positioning plate 201 Two positioning plates 201 are provided inside the outer box body 200 , and a baffle plate 202 is slidably connected to the inside of the two positioning plates 201 .

Specifically, a first solenoid 300 is fixedly connected to the side of the outer box 200 away from the air-permeable plate 101, and a slider 301 is fixedly connected to the side of the first solenoid 300 away from the inner wall of the outer box 200. With the magnetic block 302 , a first spring 303 is provided on the outside of the first solenoid 300 , and a connecting rod 304 is fixedly connected to the side of the slider 301 away from the first solenoid 300 .

Specifically, a device box 400 is arranged inside the circuit breaker housing 100 , and a protection box 500 is fixedly installed above the device box 400 .

Specifically, a second solenoid 501 is fixedly installed on the inner top of the protection box 500, and a second spring 502 is provided on the left and right sides of the second solenoid 501, and the second spring 502 is away from One end of the inner wall of the protection box 500 is fixedly connected with a first tooth plate 503 .

Specifically, the outer side of the first tooth plate 503 is meshed with a drive gear 504, and the side of the drive gear 504 away from the drive gear 504 is meshed with a second tooth plate 505, and the second tooth plate 505 A conductive block 506 is fixedly connected to an end away from the inner wall of the protective box 500 , and an electric circuit 507 is provided inside the protective box 500 .

Specifically, an airbag box 600 is arranged below the device box 400, and a heat conduction sheet is fixedly connected between the device box 400 and the airbag box 600. An elastic bag 601 is arranged inside the airbag box 600, and the elastic bag The lower end of 601 is fixedly connected with an air duct 602 .

Specifically, a sealing cylinder 700 is fixedly connected to the right end of the air guide tube 602, a piston block 701 is slidably connected to the inside of the sealing cylinder 700, and a third spring 702 is fixedly connected to the left side of the piston block 701. The left sides of the three springs 702 are fixedly connected with the inner wall of the sealing cylinder 700 .

Specifically, a connecting rod 703 is fixedly connected to the right side of the piston block 701 , a conductive post 704 is fixedly mounted on the right end of the connecting rod 703 , and a sliding rheostat 705 is arranged below the conductive post 704 .

Working principle: When the internal high temperature warning protection device of the vacuum circuit breaker is in use, when the temperature of the device box 400 is too high, the heat will be transferred to the inside of the airbag box 600 through the conductive sheet, and the elastic bag 601 inside the airbag box 600 will be heated. The internal air will expand and enter the sealed cylinder 700 through the air duct 602, the gas in the sealed cylinder 700 will push the piston block 701 to move, the piston block 701 drives the connecting rod 703 and the conductive column 704 to move to the right, and the conductive column 704 moves to the right and slides On the varistor 705, so that the resistance value of the sliding varistor 705 access line becomes smaller, according to the relationship between current and resistance, it can be seen that the current connected to the sliding varistor 705 increases at this time, so that the first solenoid 300 and the current connected to the second solenoid 501 increase, and the magnetism at both ends of the first solenoid 300 attracts the magnetic block 302 to drive the slider 301 and the connecting rod 304 to move, and then drives the baffle 202 to leave the outside of the air-permeable plate 101 , so that the inside of the circuit breaker can dissipate heat;

And the magnetic attraction of the second solenoid 501 is connected with the small iron sheet connected with the first tooth plate 503 so as to drive the first tooth plate 503 to move. When the first tooth plate 503 moves, it drives the drive gear 504 to rotate, and the drive gear 504 rotates. When the second tooth plate 505 is driven to move, the second tooth plate 505 drives the conductive block 506 to be close to each other. After the two conductive blocks 506 are close to contact with the energized line 507, the line will be short-circuited, so that when the heat is too high The internal current of the circuit breaker no longer passes through the components, thereby protecting the internal components of the circuit breaker from damage.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (8)

1. A high temperature early warning and protection device inside a vacuum circuit breaker, comprising a circuit breaker outer shell (100), characterized in that: the left and right sides of the circuit breaker outer shell (100) are fixedly installed with a breathable plate (101) , the vent plate (101) is provided with a vent hole (102), the left side and the right side of the circuit breaker outer casing (100) are fixedly installed with an outer box (200), and the outer box (200 ) is fixedly installed with a positioning plate (201), the positioning plate (201) is provided with two pieces in the outer box (200), and the inner side of the two positioning plates (201) is slidingly connected with a baffle plate (202). 2. A high-temperature early warning and protection device for a vacuum circuit breaker according to claim 1, characterized in that: a solenoid (300) is fixedly connected to the side of the outer box (200) away from the air-permeable plate (101). ), the side of the solenoid (300) away from the inner wall of the outer box (200) is fixedly connected with a slider (301) and a magnetic block (302), and the outer side of the solenoid (300) is provided with a first The spring (303), the side of the slider (301) away from the solenoid (300) is fixedly connected with a connecting rod (304). 3. A high temperature warning and protection device inside a vacuum circuit breaker according to claim 1, characterized in that: a device box (400) is provided inside the circuit breaker outer shell (100), and the device box (400) A protective box (500) is fixedly installed on the top. 4. A high temperature warning and protection device inside a vacuum circuit breaker according to claim 3, characterized in that: a second solenoid (501) is fixedly installed on the inner top of the protection box (500), and the second The left and right sides of the solenoid (501) are provided with a second spring (502), and the end of the second spring (502) away from the inner wall of the protection box (500) is fixedly connected to the first tooth plate (503) , the side of the second solenoid (501) away from the inner wall of the protection box is provided with a small iron piece. 5. A high temperature warning and protection device inside a vacuum circuit breaker according to claim 4, characterized in that: the outer side of the first tooth plate (503) is meshed with a driving gear (504), and the driving gear ( 504) The side away from the drive gear (504) is meshed with a second tooth plate (505), and the end of the second tooth plate (505) away from the inner wall of the protection box (500) is fixedly connected with a conductive block (506) , the inside of the protection box (500) is provided with a power line (507), and the first tooth plate (503) is fixedly connected with the small iron piece. 6. The internal high temperature warning and protection device of a vacuum circuit breaker according to claim 3, characterized in that: an airbag box (600) is arranged under the device box (400), and the device box (400) is connected with the airbag A heat conduction sheet is fixedly connected between the boxes (600), an elastic bag (601) is arranged inside the airbag box (600), and an air guide tube (602) is fixedly connected to the lower end of the elastic bag (601). 7. A high temperature early warning and protection device inside a vacuum circuit breaker according to claim 6, characterized in that: the right end of the air duct (602) is fixedly connected with a sealing cylinder (700), and the sealing cylinder (700) A piston block (701) is slidingly connected inside, and a third spring (702) is fixedly connected to the left side of the piston block (701), and the left side of the third spring (702) is fixed to the inner wall of the sealing cylinder (700). connect. 8. A high temperature warning and protection device inside a vacuum circuit breaker according to claim 7, characterized in that: a connecting rod (703) is fixedly connected to the right side of the piston block (701), and the connecting rod (703) A conductive column (704) is fixedly installed at the right end of the conductive column (704), and a sliding varistor (705) is arranged below the conductive column (704).

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