CN216624138U

CN216624138U - Circuit breaker

Info

Publication number: CN216624138U
Application number: CN202122673795.0U
Authority: CN
Inventors: 王文贵; 郭德鑫; 黎佳财; 高仁旦; 赵立博
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2022-05-27
Anticipated expiration: 2031-11-03

Abstract

The utility model provides a circuit breaker, includes the casing, installs arc extinguishing system, explosion chamber housing, conductive system and operating device in the casing, the casing is formed by base, well lid and the face lid assembly that covers in proper order, the explosion chamber housing is installed between base and well lid and is located the side of operating device handle, forms the cavity between explosion chamber housing and the base, the arc extinguishing system is located in the cavity, conductive system's movable contact and stationary contact are located in the cavity to it is corresponding with the arc extinguishing system. According to the circuit breaker, the arc extinguish chamber housing is additionally arranged between the base and the middle cover, so that the arc extinguish chamber housing is wrapped on the conductive system and the arc extinguish system, namely, breaking action and arc extinction are carried out under the covering of the arc extinguish chamber housing, therefore, the direct impact of air pressure generated by the conductive system on the middle cover when the circuit breaker is opened is prevented, high-pressure gas generated by electric arcs is prevented from rushing the electric arcs to the operating mechanism and the tripping system behind the conductive system and spraying out to damage the electric arcs, and the reliability of the circuit breaker is improved.

Description

Circuit breaker

Technical Field

The utility model relates to the technical field of low-voltage electric appliances, in particular to a circuit breaker.

Background

In the existing plastic case type circuit breaker, an arc extinguishing system and a conductive device are respectively contained in a cavity formed by a base DMC and a cover DMC, wherein the arc extinguishing system comprises an arc extinguishing chamber (a plurality of arc extinguishing grid sheets and a hydrogen trimer plate) and an arc isolating reflecting plate. When the circuit breaker is in a fault, the contact device of the circuit breaker is opened, short circuit or overload current is cut off to protect the circuit, and when the moving contact and the static contact are opened, because the cover DMC directly covers the upper part of the arc extinguish chamber, high air pressure is generated in the cutting chamber and the arc extinguish chamber, the high air pressure directly acts on the cover, strong impact is generated on the cover, and the cover is easy to break; when the static contact is opened, the moving contact impacts the cover under the action of electric power, and the cover is broken.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides a circuit breaker for preventing a cover from being broken.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a circuit breaker, includes the casing, installs arc extinguishing system, explosion chamber housing, electrically conductive system and operating device in the casing, the casing is formed by base, well lid and the face lid equipment that covers in proper order, the explosion chamber housing is installed between base and well lid and is located the side of operating device handle, forms the cavity between explosion chamber housing and the base, the arc extinguishing system is located in the cavity, electrically conductive system's movable contact and stationary contact are located in the cavity to it is corresponding with the arc extinguishing system.

Preferably, the explosion chamber housing includes the roof, the preceding curb plate be connected with the roof, left side board and right side board, the front side of preceding curb plate is connected with fixed step, well lid is equipped with the annex mounting groove, the diapire of annex mounting groove is equipped with annex installation position hole and annex ejector pin hole, the fixed step of explosion chamber housing with the annex installation position hole position of annex mounting groove diapire is laminated mutually.

Preferably, the front side plate is provided with a dodging hole for dodging the handle, the dodging hole is a square hole, and the top wall of the dodging hole is obliquely arranged and matched with the arc surface of the handle.

Preferably, the junction of the preceding curb plate of explosion chamber housing and fixed step is equipped with two spacing posts that are located dodge the hole both sides, well lid is equipped with two division boards with two spacing post one-to-one, two division boards of explosion chamber housing correspond the outside attached two spacing posts of well lid, and the fixed step of explosion chamber housing is fixed on the base, conductive system installs in the base.

Preferably, the inner side surfaces of the left side plate and the right side plate are provided with step surfaces.

Preferably, a positioning protrusion is arranged on the bottom surface of the fixing step, and the positioning protrusion is inserted between the base and the arc extinguishing system.

Preferably, a plurality of spaced reinforcing ribs are arranged between the left side plate and the right side plate on the bottom surface of the top plate of the arc extinguish chamber housing, and an accommodating gap for accommodating a single arc extinguishing system is formed between a single reinforcing rib and another reinforcing rib, the left side plate or the right side plate; the strengthening rib is equipped with the slot, be equipped with on the base with slot complex letter muscle, the strengthening rib of explosion chamber housing passes through the letter muscle that the slot can wrap up the base.

Preferably, the rear end of the reinforcing rib is provided with an exhaust column, and the end part of the exhaust column is provided with a circular inclined plane.

Preferably, the arc extinguishing system comprises an arc extinguishing chamber, and a plurality of arc extinguishing grid pieces and gas generating pieces are arranged in the arc extinguishing chamber.

Preferably, the arc extinguish chamber housing is fixedly connected with the base through a plurality of first screws and a plurality of second screws, a plurality of first screw holes are formed in a row on a fixing step of the arc extinguish chamber housing, and the first screws are matched with the first screw holes in a one-to-one correspondence manner; the rear end of explosion chamber housing is equipped with one-row second screw hole, the second screw hole runs through roof and the strengthening rib of explosion chamber housing, the cooperation of second screw and first screw hole one-to-one.

Preferably, a top plate of the arc extinguish chamber housing is provided with a perspective hole for installing a transparent block, and the transparent block is inserted into the perspective hole.

According to the circuit breaker, the arc extinguish chamber housing is additionally arranged between the base and the middle cover, so that the arc extinguish chamber housing is wrapped on the conductive system and the arc extinguish system, namely, breaking action and arc extinction are carried out under the covering of the arc extinguish chamber housing, therefore, the direct impact of air pressure generated by the conductive system on the middle cover when the circuit breaker is opened is prevented, high-pressure gas generated by electric arcs is prevented from rushing the electric arcs to the operating mechanism and the tripping system behind the conductive system and spraying out to damage the electric arcs, and the reliability of the circuit breaker is improved.

Drawings

Fig. 1 is a first sectional view of a part of the structure of the circuit breaker of the present invention;

fig. 2 is a second sectional view of a portion of the circuit breaker of the present invention;

FIG. 3 is an exploded view of the base and arc chute housing of the present invention;

FIG. 4 is a perspective view of the reverse side of the arc chute housing of the present invention;

FIG. 5 is a perspective view of the front of the arc chute housing of the present invention;

fig. 6 is a schematic diagram of a partial structure of the circuit breaker of the present invention;

figure 7 is a schematic view of the structure of the cover and arc chute housing portions of the present invention.

Detailed Description

The following describes the circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 7. The circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1 and 2, the circuit breaker of the present invention includes a housing, an arc extinguishing system 2 installed in the housing, an arc extinguishing chamber housing 3, a conductive system 4 and an operating mechanism 6, wherein the housing is assembled by a base 1, a middle cover 5 and a surface cover 8 which are sequentially covered, the arc extinguishing chamber housing 3 is installed between the base 1 and the middle cover 5 and is located at a side of a handle of the operating mechanism 6, a cavity is formed between the arc extinguishing chamber housing 3 and the base 1, the arc extinguishing system 2 is located in the cavity, and a movable contact and a stationary contact of the conductive system 4 are located in the cavity and correspond to the arc extinguishing system 2. When the breaker is short-circuited or overloaded, the movable contact and the fixed contact of the conducting system 4 are disconnected, and high air pressure is generated in the breaking chamber and the arc extinguishing system 2. According to the circuit breaker, the arc extinguish chamber housing 3 is additionally arranged between the base 1 and the middle cover 5 to enable the arc extinguish chamber housing to wrap the conductive system 4 and the arc extinguish system 2, namely, breaking action and arc extinction are carried out under the covering of the arc extinguish chamber housing, so that the direct impact of air pressure generated by the conductive system 4 on the middle cover 5 when the circuit breaker is opened is prevented, high-pressure gas generated by electric arc is prevented from impacting the electric arc to the operating mechanism 6 and a tripping system behind the conductive system 4 and spraying out to damage the electric arc, and the reliability of the circuit breaker is improved. Moreover, the independent arc extinguish chamber housing 3 is adopted, so that the arc extinguish chamber housing 3 and the middle cover 5 can be made of different materials, and the arc extinguish chamber housing 3 is made of DMC or SMC materials in the embodiment, so that the arc prevention function is achieved; the middle cover 5 is made of PA.

As shown in fig. 3 to 5, the arc extinguish chamber housing 3 includes a top plate 301, a front side plate 34 connected to the top plate 301, a left side plate 302 and a right side plate 31, the front side plate 34 is located above a moving contact of the conductive system 4, a fixing step 37 is connected to the front side of the front side plate 34, as shown in fig. 6, the middle cover 5 is provided with an accessory mounting groove, an accessory mounting position hole 51 and an accessory ejector rod hole 52 are provided in the bottom wall of the accessory mounting groove, and the fixing step 37 of the arc extinguish chamber housing 3 is attached to the accessory mounting position hole 51 in the bottom wall of the accessory mounting groove. The accessory mounting position hole 51, the accessory ejector rod hole 52 and the contact knife 41 of the conductive system 4 are separated by the fixing step 37 of the arc extinguish chamber housing 3, so that gas generated when the contact knife 41 is broken is separated, the gas is exhausted forwards and cannot flow out from the accessory mounting position hole 51 backwards, and the effect of preventing arc back spraying is achieved. Preferably, a reserved inclined plane 39 is arranged at the joint of the front side plate 34 of the arc extinguish chamber housing 3 and the fixed step 37, an expanded inclined plane 53 corresponding to the reserved inclined plane 39 is arranged on the bottom wall of the accessory mounting groove, the space of the accessory mounting groove is enlarged, materials are reduced, and the position of an accessory of the middle cover is reserved.

Preferably, the front side plate 34 is provided with an avoiding hole 300 for avoiding the handle, and one end of the handle of the operating mechanism 6 extends into the avoiding hole 300 when the breaker is switched on. Specifically, dodge hole 300 and be the quad slit, dodge the roof 35 slope setting of hole 300, with the arc surface phase-match of handle. The bottom wall 310 of the avoiding hole 300 is located between the conductive system 4 and the handle, so that the avoiding hole 300 above the contact knife 41 of the conductive system 4 is reduced, and the impact of air pressure generated by the conductive system 4 on the handle of the operating mechanism 6 can be reduced. The arc extinguish chamber housing 3 wraps the position of the handle of the operating mechanism 6 when the handle is switched on, and the impact of the breaking air pressure generated by the conducting system 4 on the handle of the operating mechanism 6 when the breaker is switched off is prevented.

Preferably, as shown in fig. 7, the front side plate 34 of the arc extinguish chamber housing 3 is provided with two limiting posts 36 located at two sides of the avoiding hole 300 at the joint of the fixed step 37, the middle cover 5 is provided with two isolation plates 54 corresponding to the two limiting posts 36 one to one, the two isolation plates 54 of the arc extinguish chamber housing 3 are correspondingly attached to the outer sides of the two limiting posts 36 of the middle cover 5, the fixed step 37 of the arc extinguish chamber housing 3 is fixed on the base 1, and the conductive system 4 is installed in the base 1. The limiting column 36 of the arc extinguishing chamber housing 3 is in limiting fit with the isolation plate 54 of the middle cover 5 to isolate gas flow between the middle cover 5 and the conductive system 4 by gas pressure, and the gas is isolated to flow to the arc extinguishing system 2 when the contact knife 41 of the conductive system 4 is repelled. A positioning protrusion 311 is disposed on a bottom surface of the fixing step 37, and the positioning protrusion 311 is inserted between the base 1 and the arc extinguishing system 2.

Preferably, a plurality of spaced ribs 313 are disposed on the bottom surface of the top plate 301 of the arc extinguishing chamber housing 3 between the left side plate 302 and the right side plate 31, and a receiving gap 303 for receiving a single arc extinguishing system 2 is formed between a single rib 313 and another rib 313, the left side plate 302 or the right side plate 31. The reinforcing ribs 313 play a role in reinforcing the arc extinguish chamber housing, and reduce deformation of the arc extinguish chamber housing caused by gas influence. The strengthening rib 313 is equipped with slot 304, be equipped with on the base 1 with slot 304 complex letter muscle, the strengthening rib 313 of explosion chamber housing 3 can wrap up the letter muscle of base 1 through slot 304 to isolated arc extinguishing system 2 of each phase increases alternate insulating properties. The front end of the reinforcing rib 313 is step-shaped and is attached to the rear side of the front side plate 34 and the bottom surface of the fixed step 37; the two sides of the reinforcing rib 313 are provided with limiting convex points 314 used for limiting the arc extinguishing system 2, and the limiting convex points 314 are abutted to the arc extinguishing system 2 to limit the arc extinguishing system 2 between the arc extinguishing chamber housing 3 and the base 1. The rear end of the reinforcing rib 313 is provided with an exhaust column 315, and the end part of the exhaust column 315 is provided with a circular inclined surface so as to narrow the outlet of the accommodating gap 303. Preferably, the inner side surfaces of the left side plate 302 and the right side plate 31 are both provided with step surfaces 316. The design of the circular inclined plane and the step surface 316 of the exhaust column 315 enhances the impact of the discharge of the disjuncted gas on the housing 3 of the arc extinguish chamber, and the discharge of the disjuncted gas after the impact is buffered, thereby better protecting the middle cover 5.

Preferably, the arc extinguishing chamber housing 3 is fixedly connected with the base 1 through a plurality of first screws and a plurality of second screws 9, a plurality of first screw holes 38 are arranged in a row on a fixing step 37 of the arc extinguishing chamber housing 3, and the first screws are matched with the first screw holes 38 in a one-to-one correspondence manner; the rear end of explosion chamber housing 3 is equipped with one row of second screw hole 312, second screw hole 312 runs through roof 301 and the exhaust post 315 of strengthening rib 313 of explosion chamber housing 3, second screw 9 and the cooperation of first screw hole 312 one-to-one. First screw hole 38 and first screw hole 312 are both counterbores.

Preferably, a top plate 301 of the arc extinguish chamber housing 3 is provided with a perspective hole 33 for installing the transparent block 7, and the transparent block 7 is inserted into the perspective hole 33. And a blind hole 32 corresponding to the assembly screw hole of the middle cover 5 is formed in the top plate 301 of the arc extinguish chamber housing 3 and used for positioning the arc extinguish chamber housing 3. The middle cover 5 is provided with a raised assembly part, the assembly part of the middle cover 5 corresponds to the blind hole 32 of the arc extinguish chamber housing 3, and the assembly part is provided with an assembly screw hole for connecting with the surface cover 8; during assembly, the assembly part of the middle cover 5 is clamped into the blind hole 32 of the arc extinguish chamber housing 3 to realize the installation and positioning of the middle cover 5 and the arc extinguish chamber housing 3, and screws are locked into the assembly screw holes to realize the fixed connection of the middle cover 5 and the surface cover 8.

The arc extinguishing system 2 of this embodiment includes the explosion chamber, is equipped with a plurality of arc extinguishing bars pieces and produces the gas piece in the explosion chamber, produce the gas piece and be the trimeric hydrogen board, further, still be equipped with the arc baffle in the explosion chamber.

The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.

Claims

1. The utility model provides a circuit breaker, includes the casing, installs arc extinguishing system (2), explosion chamber housing (3), conducting system (4) and operating device (6) in the casing, its characterized in that: the casing is formed by base (1), well lid (5) and face lid (8) equipment that cover in proper order, install between base (1) and well lid (5) and be located the side of operating device (6) handle in explosion chamber housing (3), form the cavity between explosion chamber housing (3) and base (1), arc extinguishing system (2) are located in the cavity, the movable contact and the stationary contact of conducting system (4) are located in the cavity to it is corresponding with arc extinguishing system (2).

2. The circuit breaker of claim 1, wherein: preceding curb plate (34), left side board (302) and right side board (31) that explosion chamber housing (3) include roof (301), be connected with roof (301), the front side of preceding curb plate (34) is connected with fixed step (37), well lid (5) are equipped with the annex mounting groove, the diapire of annex mounting groove is equipped with annex installation position hole (51) and annex ejector pin hole (52), fixed step (37) of explosion chamber housing (3) with annex installation position hole (51) the position of annex mounting groove diapire is laminated mutually.

3. The circuit breaker of claim 2, wherein: preceding curb plate (34) are equipped with and are used for dodging hole (300) of handle, dodge hole (300) and be the quad slit, the roof (35) slope setting of dodging hole (300) with the arc surface phase-match of handle.

4. The circuit breaker of claim 2, wherein: preceding curb plate (34) of explosion chamber housing (3) are equipped with two spacing posts (36) that are located dodge hole (300) both sides with the junction of fixed step (37), well lid (5) are equipped with two division boards (54) with two spacing post (36) one-to-one, two division boards (54) of explosion chamber housing (3) correspond the outside attached two spacing posts (36) of well lid (5), and fixed step (37) of explosion chamber housing (3) are fixed on base (1), conducting system (4) are installed in base (1).

5. The circuit breaker of claim 2, wherein: the inner side surfaces of the left side plate (302) and the right side plate (31) are respectively provided with a step surface (316).

6. The circuit breaker of claim 2, wherein: and a positioning protrusion (311) is arranged on the bottom surface of the fixed step (37), and the positioning protrusion (311) is inserted between the base (1) and the arc extinguishing system (2).

7. The circuit breaker of claim 2, wherein: a plurality of spaced reinforcing ribs (313) are arranged on the bottom surface of a top plate (301) of the arc extinguish chamber housing (3) and between a left side plate (302) and a right side plate (31), and an accommodating gap (303) for accommodating a single arc extinguishing system (2) is formed between a single reinforcing rib (313) and another reinforcing rib (313) as well as between the single reinforcing rib and the left side plate (302) or between the single reinforcing rib and the right side plate (31); the reinforcing rib (313) is provided with a slot (304), the base (1) is provided with a letter rib matched with the slot (304), and the reinforcing rib (313) of the arc extinguish chamber housing (3) can wrap the letter rib of the base (1) through the slot (304); the rear end of the reinforcing rib (313) is provided with an exhaust column (315), and the end part of the exhaust column (315) is provided with a circular inclined plane.

8. The circuit breaker of claim 1, wherein: the arc extinguishing system (2) comprises an arc extinguishing chamber, and a plurality of arc extinguishing grid pieces and gas generating pieces are arranged in the arc extinguishing chamber.

9. The circuit breaker according to any one of claims 1-8, wherein: the arc extinguish chamber housing (3) is fixedly connected with the base (1) through a plurality of first screws and a plurality of second screws (9), a plurality of first screw holes (38) which are arranged in a row are arranged on a fixing step (37) of the arc extinguish chamber housing (3), and the first screws and the first screw holes (38) are matched in a one-to-one corresponding mode; the rear end of explosion chamber housing (3) is equipped with one row of second screw hole (312), roof (301) and strengthening rib (313) that explosion chamber housing (3) was run through in second screw hole (312), second screw (9) and second screw hole (312) one-to-one cooperation.

10. The circuit breaker according to any one of claims 1-8, wherein: be equipped with perspective hole (33) that are used for installing transparent piece (7) on roof (301) of explosion chamber housing (3), transparent piece (7) cartridge is in perspective hole (33).