Moulded case circuit breaker arc extinguishing device with semi-closed one-way diversion structure

Abstract

The invention discloses a molded case circuit breaker arc extinguishing device of a semi-closed one-way diversion structure, which comprises a housing, an arc extinguishing grid plate, a sliding baffle plate, a housing rear end opening and a housing lower end opening, the arc extinguishing grid plate is arranged in the housing, two ends of the arc extinguishing grid plate are fixedly connected with the inner side wall of the housing, a vertical strip-shaped hole is arranged in the center of the front end of the housing, and the sliding baffle plate is arranged in the strip-shaped hole. A strip-shaped hole is formed in the front end of the cover shell, a sliding groove is formed in the position, at the strip-shaped hole, of the front end of the cover shell, an opening is formed in the upper end of the sliding groove, a sliding baffle can be inserted into the sliding groove, the sliding baffle can slide up and down in the sliding groove, a through hole is formed in the center of the sliding baffle and communicates with the strip-shaped hole, and the moving contact penetrates through the strip-shaped hole and makes contact with the static contact through the through hole. An open framework side plate is replaced by a housing, a strip-shaped hole is arranged to be matched with a sliding baffle, only a moving contact is allowed to penetrate through the housing, a passing hole moves up and down along with the moving contact, an arc extinguishing chamber and an action chamber are separated through the sliding baffle, flowing gas in a single flow direction can accelerate entering of an arc into an arc extinguishing grid piece, the arc extinguishing effect is improved, and the service life of the arc extinguishing chamber is prolonged. And meanwhile, molten metal particles generated by high-current short-circuit breaking can be effectively blocked, and an effective protection effect on a partial region of an action structure of the circuit breaker is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of molded case circuit breakers, and in particular to an arc extinguishing device of a molded case circuit breaker with a semi-enclosed unidirectional flow-conducting structure. Background Art

[0002] The main function of the arc extinguishing system of the molded case circuit breaker is to divide the arc and conduct current. The current traditional single-breakpoint molded case circuit breaker uses an arc extinguishing system with an arc extinguishing chamber as the main component. In this structural layout, the arc extinguishing chamber is installed in the arc extinguishing cavity composed of a base and a cover. Due to the poor coordination between the movable range of the circuit breaker's moving contact and the base and the cover, there is a large gap between the arc extinguishing cavity and other areas of the circuit breaker. When a short circuit occurs, some high-temperature and high-pressure gases and molten metal particles will enter the circuit breaker operating mechanism and other areas along the gap, thereby causing phase-to-phase short circuits, operating mechanism jamming and other faults. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a semi-enclosed one-way flow-guiding structure arc extinguishing device for a molded case circuit breaker. The structure is cleverly designed and effectively blocks the airflow carrying impurities from entering the operating mechanism area through the semi-enclosed movable structure.

[0004] In order to achieve the above-mentioned object of the invention, the technical solution of the present invention is: A semi-enclosed, one-way flow-conducting arc-extinguishing device for a molded case circuit breaker comprises a cover, an arc-extinguishing grid, and a sliding baffle. The rear end and the lower end of the cover are open, the arc-extinguishing grid is arranged inside the cover, and its two ends are fixedly connected to the inner side wall of the cover. A vertical strip hole is provided at the center of the front end of the cover, a slide groove is provided at the front end of the cover at the strip hole, the upper end of the slide groove is open, and the sliding baffle can be inserted. The sliding baffle can slide up and down in the slide groove, and a through hole is provided at the center of the sliding baffle, which is connected to the strip hole. The moving contact passes through the strip hole and contacts the static contact through the through hole.

[0005] When the circuit breaker is in the closed state, the sliding baffle moves with the moving contact to the lower end of the cover housing slide slot, and there is a certain gap between the upper end of the strip hole and the upper end of the sliding baffle. At this time, the arc extinguishing device is in an unclosed state; when the circuit breaker is in the open state, the sliding baffle moves up with the moving contact. At this time, the sliding baffle is driven by the moving contact to move to the upper position, and the entire strip hole can be closed. There is only a narrow gap between the sliding baffle and the strip hole at the matching position.

[0006] The area range of the chute covers the area range of the strip hole.

[0007] Furthermore, the sliding baffle is a rectangular plate with a width greater than that of the strip hole, a width slightly smaller than that of the through hole, and slightly greater than the horizontal thickness of the moving contact. The length of the through hole is greater than the vertical width of the moving contact's rocker arm and less than the vertical length of the strip hole. When the moving contact moves to the open state, the upper and lower edges of the rocker arm approach or contact the upper and lower ends of the through hole, respectively. This design aims to maximize the separation between the arc extinguishing chamber and the operating chamber. By providing the sliding baffle, the ingress of molten metal particles into the operating mechanism is minimized, thereby improving the reliability of the circuit breaker's breaking operation.

[0008] Furthermore, the cover is formed by two pieces of bilaterally symmetrical structures, with threaded holes provided at the upper and lower ends for easy threaded connection, and multiple square mounting holes provided on both side walls of the cover for easy installation and fixing of the arc-extinguishing grid.

[0009] The device also includes a static contact, which includes a connecting terminal at the rear end and a U-shaped plate at the front end. The U-shaped plate is a horizontally inverted U-shape, and a contact is fixedly provided on the upper surface of the upper end.

[0010] Furthermore, the upper end of the U-shaped plate of the static contact is trapezoidal, and the contact is arranged in the center of the trapezoid. This trapezoidal design is adapted to the V-shaped structure of the arc extinguishing grid. The chamber surrounded by the two can better cover the movement trajectory of the moving contact and improve the arc extinguishing effect.

[0011] Furthermore, a U-shaped bend is provided on the inner side of the U-shaped plate of the static contact, and a block is provided in the cover shell. The block can be inserted into the U-shaped bend to limit the position of the static contact, effectively integrating the static contact with the arc extinguishing device, and improving the stability of the entire device.

[0012] The arc extinguishing grid includes a V-shaped grid group and a tongue grid at the lower end of the V-shaped grid group. The front end of the tongue grid is a tongue, which is arranged directly below the U-shaped cavity of the U-shaped grid group. It is inclined toward the bottom of the front end, and its front end is close to the end edge of the trapezoidal structure of the static contact. The tongue grid is close to the static contact, plays the role of guiding the arc, and can promote the arc to enter the arc extinguishing chamber.

[0013] The top of the cover is in contact with the middle cover, and the lower end is in contact with the base. The cover is confined in the arc extinguishing chamber by docking the middle cover with the base.

[0014] The present invention has the following beneficial effects: Compared with the traditional arc extinguishing chamber assembly structure, the present invention semi-encloses the arc extinguishing grid assembly in the cover, and the rear end is connected to the arc extinguishing channel, wherein the sliding baffle can slide up and down with the movement of the moving contact. When the circuit breaker is short-circuited and disconnected, the movement of the moving contact disconnects the circuit, driving the sliding baffle to move rapidly. The sliding baffle cooperates with the cover slide groove to effectively isolate the arc extinguishing system from other areas of the circuit breaker. Only the air outlet channel is retained at the inlet end of the circuit breaker. The flowing gas in a single direction can accelerate the arc to enter the arc extinguishing grid, thereby improving the arc extinguishing effect. At the same time, it can effectively block the molten metal particles generated by large current short-circuit disconnection, and effectively protect some areas of the circuit breaker action structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of an embodiment of the present invention.

[0016] Figure 2 for Figure 1 Explosion diagram; Figure 3 is a schematic diagram of the housing assembly; Figure 4 Schematic diagram of the static contact structure.

[0017] 1-cover, 2-arc extinguishing grid, 3-static contact, 4-strip hole, 5-slide groove, 6-slide baffle, 61-through hole, 11-stopper, 12-mounting hole, 22-tab grid, 31-connecting terminal, 32-U-shaped plate, 33-contact. DETAILED DESCRIPTION

[0018] The following will be combined with the Figure 1 To the attached Figure 4 , clearly and completely describe the technical solution of the present invention.

[0019] A semi-enclosed, one-way flow-conducting structure arc extinguishing device for a molded case circuit breaker comprises a cover, an arc extinguishing grid, and a sliding baffle. The rear end and the lower end of the cover are open, and the cover replaces the two skeleton side plates of a traditional arc extinguishing chamber. The arc extinguishing grid is arranged inside the cover, and its two ends are fixedly connected to the inner side wall of the cover. A vertical strip hole is provided at the center of the front end of the cover, and a slide groove is provided at the front end of the cover at the strip hole. The upper end of the slide groove is open, and the sliding baffle can be inserted. The sliding baffle can slide up and down in the slide groove. A through hole is provided at the center of the sliding baffle, and the through hole is connected to the strip hole. The moving contact passes through the strip hole and contacts the static contact through the through hole.

[0020] When the circuit breaker is in the closed state, the sliding baffle moves with the moving contact to the lower end of the cover housing slide slot, and there is a certain gap between the upper end of the strip hole and the upper end of the sliding baffle. At this time, the arc extinguishing device is in an unclosed state; when the circuit breaker is in the open state, the sliding baffle moves up with the moving contact. At this time, the sliding baffle is driven by the moving contact to move to the upper position, and the entire strip hole can be closed. There is only a narrow gap between the sliding baffle and the strip hole at the matching position.

[0021] The area range of the slide groove covers the area range of the strip hole. The width of the slide groove is slightly larger than the width of the sliding baffle. When the sliding baffle moves to the bottom of the slide groove, there is a gap between its upper end and the strip hole. When the sliding baffle moves to the open state with the moving contact, the lower edge of the sliding baffle is below the lower edge of the strip hole.

[0022] Furthermore, the sliding baffle is a rectangular plate with a width greater than that of the strip hole, a width slightly smaller than that of the through hole, and slightly greater than the horizontal thickness of the moving contact. The length of the through hole is greater than the vertical width of the moving contact's rocker arm and less than the vertical length of the strip hole. When the moving contact moves to the open state, the upper and lower edges of the rocker arm approach or contact the upper and lower ends of the through hole, respectively. This design aims to maximize the separation between the arc extinguishing chamber and the operating chamber. By providing the sliding baffle, the ingress of molten metal particles into the operating mechanism is minimized, thereby improving the reliability of the circuit breaker's breaking operation.

[0023] Furthermore, the cover is formed by two pieces of bilaterally symmetrical structures, with threaded holes provided at the upper and lower ends for easy threaded connection, and multiple square mounting holes provided on both side walls of the cover for easy installation and fixing of the arc-extinguishing grid.

[0024] The device also includes a static contact, which includes a connecting terminal at the rear end and a U-shaped plate at the front end. The U-shaped plate is a horizontally inverted U-shape, and a contact is fixedly provided on the upper surface of the upper end.

[0025] Furthermore, the upper end of the U-shaped plate of the static contact is trapezoidal, and the contact is arranged in the center of the trapezoid. This trapezoidal design is adapted to the V-shaped structure of the arc extinguishing grid. The chamber surrounded by the two can better cover the movement trajectory of the moving contact and improve the arc extinguishing effect.

[0026] Furthermore, a U-shaped bend is provided on the inner side of the U-shaped plate of the static contact, and a block is provided in the cover shell. The block can be inserted into the U-shaped bend to limit the position of the static contact, effectively integrating the static contact with the arc extinguishing device, and improving the stability of the entire device.

[0027] The arc extinguishing grid includes a V-shaped grid group and a tongue grid at the lower end of the V-shaped grid group. The front end of the tongue grid is a tongue, which is arranged directly below the U-shaped cavity of the U-shaped grid group. It is inclined toward the bottom of the front end, and its front end is close to the end edge of the trapezoidal structure of the static contact. The tongue grid is close to the static contact, plays the role of guiding the arc, and can promote the arc to enter the arc extinguishing chamber.

[0028] The top of the cover is in contact with the middle cover, and the lower end is in contact with the base. The cover is confined in the arc extinguishing chamber by docking the middle cover with the base.

[0029] Compared with the traditional arc extinguishing chamber assembly structure, the present invention semi-encloses the arc extinguishing grid assembly in the cover, and the rear end is connected to the arc extinguishing channel, wherein the sliding baffle can slide up and down with the movement of the moving contact. When the circuit breaker is short-circuited and disconnected, the movement of the moving contact disconnects the circuit, driving the sliding baffle to move rapidly. The sliding baffle cooperates with the cover slide groove to effectively isolate the arc extinguishing system from other areas of the circuit breaker. Only the air outlet channel is retained at the inlet end of the circuit breaker. The flowing gas in a single direction can accelerate the arc to enter the arc extinguishing grid, thereby improving the arc extinguishing effect. At the same time, it can effectively block the molten metal particles generated by large current short-circuit disconnection, and effectively protect some areas of the circuit breaker action structure.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in the technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention without paying creative labor.

Claims

1. A semi-enclosed, one-way flow-conducting arc-extinguishing device for a molded case circuit breaker, characterized in that: It includes a cover shell, an arc extinguishing grid, and a sliding baffle. The rear end and the lower end of the cover shell are open. The arc extinguishing grid is arranged inside the cover shell, and its two ends are fixedly connected to the inner side wall of the cover shell. A vertical strip hole is provided at the center of the front end of the cover shell. A sliding groove is provided at the front end of the cover shell at the strip hole. The upper end of the sliding groove is open and can be inserted with the sliding baffle. The sliding baffle can slide up and down in the sliding groove. A through hole is provided at the center of the sliding baffle, which is connected with the strip hole. The moving contact passes through the strip hole and contacts the static contact through the through hole.

2. The arc extinguishing device of a molded case circuit breaker with a semi-enclosed one-way flow-conducting structure according to claim 1, characterized in that: When the circuit breaker is opened, the sliding baffle moves up with the moving contact. At this time, the sliding baffle is moved to the upper position under the drive of the moving contact, and the entire strip hole can be closed.

3. The arc extinguishing device of a molded case circuit breaker with a semi-enclosed one-way flow-conducting structure according to claim 1, characterized in that: The area range of the chute covers the area range of the strip hole.

4. The arc extinguishing device of a molded case circuit breaker with a semi-enclosed one-way flow-conducting structure according to claim 1, characterized in that: The sliding baffle is a rectangular plate, whose width is greater than the width of the strip hole, the width of the through hole is less than the width of the strip hole, and greater than the left-right thickness of the moving contact. The length of the through hole is greater than the up-down width of the rocker arm of the moving contact, and less than the vertical length of the strip hole. When the moving contact moves to the open state, the upper and lower edges of the rocker arm of the moving contact are close to or contact the upper and lower ends of the through hole respectively.

5. The arc extinguishing device of a molded case circuit breaker with a semi-enclosed one-way flow-conducting structure according to claim 1, characterized in that: The cover is made up of two symmetrical structures. Threaded holes are set on the upper and lower ends for easy threaded connection. Multiple square mounting holes are set on the two side walls of the cover to facilitate the installation and fixation of arc extinguishing grids.

6. The arc extinguishing device of a molded case circuit breaker with a semi-enclosed one-way flow-conducting structure according to claim 1, characterized in that: The device also includes a static contact, which includes a connecting terminal at the rear end and a U-shaped plate at the front end. The U-shaped plate is a horizontally inverted U-shape, and a contact is fixedly provided on the upper surface of the upper end.

7. The arc extinguishing device of a molded case circuit breaker with a semi-enclosed one-way flow-conducting structure according to claim 6, characterized in that: The upper end of the static contact U-shaped plate is trapezoidal, and the contact is arranged in the center of the trapezoid; a U-shaped bend is arranged on the inner side of the static contact U-shaped plate, and a stopper is arranged in the cover shell, which can be inserted into the U-shaped bend to limit the position of the static contact.

8. The arc extinguishing device of a molded case circuit breaker with a semi-enclosed one-way flow-conducting structure according to claim 1, characterized in that: The arc-extinguishing grid includes a V-shaped grid group and a tongue grid at the lower end of the V-shaped grid group. The front end of the tongue grid is a tongue, which is arranged directly below the V-shaped cavity of the V-shaped grid group. It is inclined toward the bottom of the front end, and its front end is close to the end edge of the trapezoidal structure of the static contact.

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