CN206976233U - A kind of circuit breaker for inflating cabinet - Google Patents

Abstract

The utility model discloses a circuit breaker for an inflatable cabinet, which comprises a pole component, a pole mounting plate and an operating mechanism, and the pole component and the operating mechanism are respectively fixed on both sides of the pole mounting plate; Arc chamber, conductor connecting device, insulating pull rod and bellows. There is a moving end conductor in the vacuum interrupter chamber. The moving end conductor is connected to the insulating pulling rod through the conductor connecting device. The conductor connecting device includes a moving contact and a joint. The other end is connected to the moving contact; the moving contact is connected to the moving end conductor in the vacuum interrupter through the joint, and the outer cylindrical surface of the moving contact is covered with a spring contact finger or a watch strap contact finger, and touches it . The utility model utilizes the conductor connection device to prevent the uneven wear of the moving terminal conductor in the vacuum interrupter chamber, which affects the service life of the interrupter chamber, and can improve the electric field distribution in the air chamber of the circuit breaker.

Description

A circuit breaker for an inflatable cabinet

technical field

The utility model belongs to the technical field of high-voltage switches, in particular to a circuit breaker for an inflatable cabinet.

Background technique

Inflatable cabinet, also called gas-insulated metal-enclosed switchgear, is to put the main components such as vacuum circuit breaker, isolating switch, grounding switch and busbar into a sealed metal box, and the inside is filled with As an insulating medium, gas has the advantages of small size, small footprint, no influence of external environment, safe and reliable operation, simple maintenance and long maintenance cycle, etc., and is widely used in various important substation places such as subways. The circuit breaker is one of the key components, and the life of the circuit breaker is directly related to the life of the inflatable cabinet. At present, the moving end contact conductor in the arc extinguishing chamber of the circuit breaker is connected to a fixed lead-out end (moving end terminal block) with a "soft connection". Since the "soft connection" is made of multi-layer thin copper plates, it has a certain degree of flexibility, which can meet the needs of the movement of the moving end contact conductor in the arc extinguishing chamber of the circuit breaker, and realize the uninterrupted electrical connection. However, the "soft connection" still has a relatively large rigidity. Using it to connect the moving end contact conductor in the arc extinguishing chamber of the circuit breaker to the fixed lead-out end will cause the moving end contact conductor in the arc extinguishing chamber to bear a large lateral force. , and increase the output work of the mechanism, so that the moving end contact conductor in the arc extinguishing chamber will appear uneven wear, which will affect the life of the arc extinguishing chamber. At the same time, the shape of the flexible connection is also relatively complex, which makes the electric field distribution in the gas chamber uneven, which increases the size of the product or reduces the insulation margin of the product.

Contents of the invention

The purpose of this utility model is to solve the above problems and provide a circuit breaker for an inflatable cabinet that can relieve the force on the moving end of the arc extinguishing chamber, prolong the service life of the arc extinguishing chamber, and improve the electric field distribution in the gas chamber of the circuit breaker.

Therefore, the technical solution of the utility model is: a circuit breaker for an inflatable cabinet, including a pole assembly, a pole mounting plate and an operating mechanism. , the operating mechanism is fixed on the other side of the pole mounting plate; the pole assembly includes a vacuum interrupter, a conductor connection device, an insulating pull rod and a bellows, and the vacuum interrupter is provided with a moving conductor, and the movable conductor is connected by a conductor The device is connected to the insulating pull rod, and the insulating pull rod is connected to the operating mechanism through a bellows, and the bellows is installed on the pole mounting plate; the conductor connection device includes a moving contact and a joint, one end of the joint is connected to the insulating pull rod, and the other end is connected to the moving contact connected; the moving contact is connected to the moving terminal conductor in the vacuum interrupter through a joint, and the outer cylindrical surface of the moving contact is covered with a spring contact finger or a strap contact finger, and contacts it.

Further, the pole assembly also includes a static terminal socket and an insulating support; the static terminal terminal socket, the vacuum interrupter, and the conductor connection device are all installed on the insulating support, and the static terminal terminal and the vacuum interrupter The fixed end is connected.

Further, the conductor connection device also includes a movable terminal socket, a guide ring and a positioning ring; the movable terminal socket is a flat plate structure, with a cylindrical protrusion in the middle, and a through hole in the cylindrical protrusion, and the movable contact Placed in the through hole; the inner wall of the through hole is provided with a number of annular grooves, the spring contact fingers or watch strap contact fingers are placed in the annular grooves, the guide ring is placed in the through hole, and the spring contact fingers or watch strap contact fingers are placed in the annular grooves. Touch the side of the finger.

When the utility model is used, one end of the joint is connected with the insulating pull rod, and the other end is connected with the moving contact. The operating mechanism drives the insulating pull rod to move through the bellows, thereby driving the moving contact. The conductor has a good electrical connection. The outer cylindrical surface of the moving contact is in contact with the spring contact finger or the watch strap contact finger installed in the groove of the moving terminal wiring seat. When the moving contact moves, the spring contact finger or the watch strap contact finger The surface slides over, so as to realize the electrical uninterrupted connection between the moving terminal seat and the moving terminal conductor in the vacuum interrupter, and realize the opening and closing of the vacuum interrupter.

The utility model uses the conductor connection device to reduce the lateral force borne by the moving end conductor of the arc extinguishing chamber and the output power of the operating mechanism, avoids uneven wear of the moving end conductor in the vacuum interrupting chamber, affects the life of the arc extinguishing chamber, and can Improves the electric field distribution in the gas chamber of the circuit breaker.

Description of drawings

Below in conjunction with accompanying drawing and embodiment of the present utility model will be described in further detail

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a structural sectional view of the utility model;

Fig. 3 is a structural schematic diagram of a pole assembly of the present invention;

Fig. 4 is a structural cross-sectional view of the utility model pole assembly;

Figure 5 is a partially enlarged view of Figure 4;

Fig. 6 is a cross-sectional view of the structure of the moving terminal socket of the present invention.

The marks in the figure are: pole assembly 1, static end terminal block 11, insulating support 12, vacuum interrupter 13, insulating pull rod 14, bellows 15, moving end conductor 16, static end conductor 17, pole mounting plate 2, Operating mechanism 3, moving terminal connecting device 4 of arc extinguishing chamber, moving terminal wiring seat 41, cylindrical protrusion 411, through hole 412, annular groove 413, spring contact finger 42, moving contact 43, joint 44, guide ring 45.

Detailed ways

See attached picture. This embodiment includes three sets of pole assemblies 1, pole mounting plates 2, and operating mechanisms 3. The three sets of pole assemblies 1 are arranged in a line and fixed on the pole mounting plates 2 with a phase distance of 150mm. The operating mechanisms 3 are also fixed on On the pole mounting plate 2 , the transmission device of the operating mechanism 3 is connected with the bellows 15 of the pole assembly 1 .

The pole assembly 1 is composed of a static end terminal socket 11, an insulating support 12, a vacuum interrupter 13, an insulating pull rod 14, a bellows 15, a connecting device 4 for a moving conductor of the arc extinguisher, and the like. The vacuum interrupter 13 is provided with a moving end conductor 16 and a static end conductor 17; the static end terminal block 11 is connected to the fixed end of the vacuum interrupter 13, one end of the insulating pull rod 14 is connected to the bellows 15, and the other end is connected to the extinguisher The joints of the moving end conductor connecting device 4 of the arc chamber are connected.

The moving terminal conductor connection device 4 of the arc extinguishing chamber is composed of a moving terminal wire seat 41, a spring contact finger 42 (or a strap contact finger), a moving contact 43, a joint 44, a guide ring 45, a positioning ring, etc.; the joint 44 One end is connected to the insulating pull rod 14, and the other end is connected to the moving contact 43; the moving contact 43 is connected to the moving end conductor 16 in the vacuum interrupter through the joint 44, and the outer cylindrical surface of the moving contact 43 is covered with a spring contact finger 42, and touch it. The moving terminal socket 41 is a flat plate structure, with a cylindrical protrusion 411 in the middle, a through hole 412 in the cylinder for accommodating the moving contact 43, and several annular grooves 413 in the through hole for accommodating the spring contacts. Finger 42 (or watch strap contact finger), another annular groove accommodates guide ring 45.

When this embodiment works, the operating mechanism 3 drives the insulating pull rod 14 to move through the bellows, thereby driving the moving contact 43 to move. The moving contact 43 is connected to the moving end conductor 16 of the vacuum interrupter through the joint 44. The moving contact 43 is connected to the moving end conductor 16 of the vacuum interrupter. The movable terminal conductor 16 of the vacuum interrupter has a good electrical connection, the outer cylindrical surface of the movable contact 43 is in contact with the spring contact finger 42 (or watch strap contact finger) installed in the groove of the movable terminal terminal seat 41, and the movable contact When 43 moves, the spring contact finger 42 (or watch strap contact finger) slides over its surface, so as to realize the electrical uninterrupted connection between the moving end terminal seat 41 and the moving end conductor 16 of the vacuum interrupter, and realize vacuum arc extinguishing The opening and closing of chamber 13.

Claims (3)

1. A circuit breaker for an inflatable cabinet, including a pole assembly, a pole mounting plate and an operating mechanism. The pole assembly is provided in three groups, distributed in a line and fixed on one side of the pole mounting plate, and the operating mechanism is fixed on the pole mounting plate. The other side; it is characterized in that: the pole assembly includes a vacuum interrupter, a conductor connection device, an insulating pull rod and a bellows, the vacuum interrupter is provided with a moving end conductor, and the moving end conductor is connected to the insulation pull rod through the conductor connection device, The insulating pull rod is connected to the operating mechanism through a bellows, and the bellows is installed on the pole mounting plate; the conductor connecting device includes a moving contact and a joint, one end of the joint is connected with the insulating pull rod, and the other end is connected with the moving contact; The contact is connected with the moving terminal conductor in the vacuum interrupter through the joint, and the outer cylindrical surface of the moving contact is covered with a spring contact finger or a strap contact finger, and contacts it. 2. A circuit breaker for an inflatable cabinet according to claim 1, characterized in that: said pole assembly also includes a static terminal terminal block and an insulating support; said static terminal terminal block, vacuum interrupter, conductor connection The devices are installed on the insulating support, and the static end terminal is connected with the fixed end of the vacuum interrupter. 3. A circuit breaker for an inflatable cabinet according to claim 1, characterized in that: said conductor connection device also includes a moving terminal socket, a guide ring and a positioning ring; said moving terminal socket is a flat plate structure , there is a cylindrical protrusion in the middle, and there is a through hole in the cylindrical protrusion, and the moving contact is placed in the through hole; there are several annular grooves on the inner wall of the through hole, and the spring contacts or watch strap contacts are placed in the annular grooves , the guide ring is placed in the through hole and is located on the side of the spring contact finger or the strap contact finger.