Circuit breaker with built-in zero-arc structure

Abstract

The present invention discloses a circuit breaker with a built-in zero-flying arc structure, which includes a housing. The housing is composed of a base, a middle cover, and an upper cover assembled together. A moving and static contact assembly and an arc extinguishing assembly are arranged inside the housing. The moving and static contact assembly includes a moving contact and a static contact that cooperate for making and breaking. The base is provided with a groove for accommodating the moving and static contact assembly. The lower part of the middle cover is provided with a convex column, and the convex column has a through hole communicating with the upper part of the middle cover and the lower end of the convex column. The arc extinguishing assembly is arranged in the through hole. When the upper cover is assembled with the middle cover, it can seal the upper end of the through hole. The convex column is provided with a first groove and a second groove through which the moving contact and the static contact can respectively pass through the through hole. The moving contact can swing along the first groove, and the moving contact and the static contact cooperate for making and breaking in the through hole. The structure of the present invention is simple, the assembly is convenient, the arc extinguishing effect is better, and the arc extinguishing assembly can be replaced conveniently.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a circuit breaker with a built-in zero-fly arc structure. Background Art

[0002] A circuit breaker generally includes a housing composed of a base, a middle cover, and an upper cover, as well as components such as a moving contact, a static contact, an arc extinguishing chamber, an arc separating wall bracket, and an arc separating plate disposed inside the housing. The base is provided with a groove for accommodating the moving and static contacts, and a shielding member is disposed in the groove. The arc separating plate is inserted into the groove and spaced apart from the shielding member to respectively form the front and rear side walls of the arc extinguishing chamber, and the two relatively disposed side walls of the groove form the left and right side walls of the arc extinguishing chamber. An opening is provided at the upper end of the shielding member for the moving contact to pass through into the arc extinguishing chamber. The upper part of the opening can be closed by the combination of the middle cover and the base to limit the movement range of the moving contact. At this time, the lower part of the middle cover forms the top wall of the arc extinguishing chamber. The static contact passes through the gap between the arc separating plate and the groove into the arc extinguishing chamber, and an arc extinguishing assembly is further disposed in the arc extinguishing chamber. The arc extinguishing assembly includes arc extinguishing grid plates. Since there are certain gaps at the joints between the middle cover, the base, and the arc separating plate, the gas and metal particles generated when the circuit breaker is tripped are likely to leak from the gaps and enter the rear end of the circuit breaker or leak to the outside of the housing, posing a certain safety hazard.

[0003] In order to prevent the gas and metal particles from spraying out, it is usually necessary to install a zero-fly arc cover accessory on the circuit breaker to block the gas and metal particles to ensure the safety during the operation of the circuit breaker. However, using the zero-fly arc cover accessory is not only inconvenient to install, but also occupies a relatively large space, correspondingly increasing the cost.

[0004] In addition, for the traditional circuit breaker structure, when the arc extinguishing assembly fails and needs to be replaced, it is necessary to separately disassemble the upper cover and the middle cover in sequence, and the operation is relatively troublesome. Summary of the Invention

[0005] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a circuit breaker with a simple structure, convenient assembly, better arc extinguishing effect, and capable of conveniently replacing the arc extinguishing assembly.

[0006] To achieve the above object, the present invention provides a circuit breaker with a built-in zero-arc structure, including a housing, which is composed of a base, a middle cover, and an upper cover assembled together. Inside the housing, there are a moving and static contact assembly and an arc extinguishing assembly. The moving and static contact assembly includes a moving contact and a static contact for cooperating with opening and closing. The base is provided with a groove for accommodating the moving and static contact assembly. The lower part of the middle cover is provided with a convex column, which can be inserted into the groove when the middle cover and the base are assembled together and simultaneously engage with the bottom inner wall of the groove. The convex column has a through hole communicating the upper part of the middle cover and the lower end of the convex column. The arc extinguishing assembly is arranged in the through hole. When the upper cover is assembled with the middle cover, it can close the upper end of the through hole. The convex column is provided with a first groove and a second groove through which the moving contact and the static contact can respectively pass through the through hole. The moving contact can swing along the first groove, and the moving contact and the static contact cooperate with each other for opening and closing in the through hole.

[0007] The beneficial effect of the present invention is that the through hole of the convex column is equivalent to the arc extinguishing chamber of a traditional circuit breaker.

[0008] Since the lower end of the convex column engages with the bottom inner wall of the groove, the moving contact and the static contact pass through the through hole through the first groove and the second groove of the convex column and cooperate for opening and closing. Blocked by the side wall of the through hole, it is possible to minimize the gap between the inside of the through hole and the rear end of the circuit breaker, increase the air pressure at the rear end of the circuit breaker, improve the blowing effect, make the metal particles ejected during breaking not easily enter the rear end of the circuit breaker, and also not easily enter the outside of the housing from other gaps, thereby improving the arc extinguishing effect of the circuit breaker and enhancing the overall safety performance. In addition, since the upper end of the through hole is closed in cooperation with the upper cover, when it is necessary to replace the arc extinguishing assembly, only the upper cover needs to be disassembled, and then the arc extinguishing assembly can be taken out along the upper end of the through hole, which can facilitate the replacement of the arc extinguishing assembly. Of course, it can also facilitate the assembly of the arc extinguishing assembly.

[0009] Further, the groove includes two relatively arranged inner side walls, and a connecting seat is arranged at the bottom inner wall of the groove. The convex column includes a first side wall that can be inserted into the connecting seat in a matching manner, and the first groove is arranged on the first side wall.

[0010] The advantage brought by the further setting is that by arranging a connecting seat at the bottom inner wall of the groove that is inserted into the first side wall of the convex column in a matching manner, better positioning effect can be obtained between the convex column and the base, and the air gap at the joint between the convex column and the bottom inner wall of the groove can be further reduced, the air pressure at the rear end of the circuit breaker can be increased, and the blowing effect can be improved.

[0011] Further, two first insertion slots are respectively and spacedly formed between both sides of the connection base and two inner side walls of the groove. Two second insertion slots respectively communicating with the two first insertion slots are arranged at the upper end of the connection base. The first side wall can be inserted into the first insertion slot and the second insertion slot simultaneously. The connection base includes connection ribs for separating the two second insertion slots. An opening capable of cooperating with the connection ribs for insertion is arranged at the lower end of the first side wall of the first groove.

[0012] The advantage of the further setting is that when the convex post is inserted into the groove, the first side wall of the convex post can be inserted into the first insertion slot and the second insertion slot simultaneously, and the opening of the first groove of the convex post is inserted into the connection ribs, which can reduce the gaps between the inner side wall of the groove and the convex post and between the connection base and the first side wall, thereby further improving the arc extinguishing effect.

[0013] Further, the convex post includes two second side walls arranged oppositely, and corresponding recesses capable of being embedded with the two second side walls of the convex post are arranged on the two inner side walls of the groove.

[0014] The advantage of the further setting is that the recesses can be used to embed the two second side walls of the convex post, so that the size of the convex post or the space of the through hole can be made larger, which is convenient for accommodating an arc extinguishing component with a larger volume and makes the internal structure of the circuit breaker more compact.

[0015] Further, the convex post includes a third side wall arranged opposite to the first side wall. The second groove is arranged on the third side wall, and a slot cooperating with the inner edge of the second groove is arranged on the static contact.

[0016] The advantage of the further setting is that through the insertion cooperation between the slot on the static contact and the inner edge of the second groove, a stable positioning cooperation can be formed between the static contact and the convex post, reducing shaking. In addition, the slot of the static contact can also cooperate with the second groove of the convex post for closing, which can prevent metal particles generated during breaking from spraying out from the gap between the static contact and the third side wall.

[0017] Further, a protrusion capable of cooperating with the upper end of the through hole for insertion when the upper cover is assembled with the middle cover is arranged at the lower part of the upper cover. A concave pit is formed at the lower end of the protrusion, and several wavy convex ribs are arranged in the concave pit.

[0018] The advantage of the further setting is that the protrusion can cooperate with the upper end of the through hole for insertion when the upper cover is assembled with the middle cover, reducing the air gap at the joint of the upper cover and the middle cover. The wavy convex ribs can slow down the movement speed of metal particles and prevent metal particles from leaking, thereby playing a role in secondary arc extinguishing.

[0019] Further, the arc extinguishing component includes an arc separating wall bracket, a plurality of arc extinguishing grid plates, and support plates connected to both sides of the plurality of arc extinguishing grid plates. The arc separating wall bracket includes a side portion closely arranged against the side wall of the through hole and a top portion covering the upper ends of the plurality of arc extinguishing grid plates. The side portion of the arc separating wall bracket includes a third groove through which the moving contact can movably pass. A gap for metal particles to pass through is left between the top portion of the arc separating wall bracket and the side wall of the through hole.

[0020] The advantage of the further setting is that: the arc separating wall bracket in the prior art is usually composed of two independent components, while the arc separating wall bracket in the present invention is integrally formed. When it is inserted into the through hole, its side portion is closely arranged against the side wall of the through hole, and its third groove is arranged at a position corresponding to the first groove, so that the moving contact can be movably inserted between the plurality of arc extinguishing grid plates, thereby improving the arc extinguishing effect; the sprayed metal particles enter the upper part of the through hole along the gap between the top portion of the arc separating wall bracket and the side wall of the through hole. Based on the blocking effect of the top portion of the arc separating wall bracket, part of the metal particles can be prevented from falling onto the static and moving contact pieces, causing mechanical failures.

[0021] Further, an inclined baffle is arranged on one side of the top portion of the arc separating wall bracket corresponding to the gap.

[0022] The advantage of the further setting is that: the inclined baffle can guide the sprayed metal particles upward along the arc separating wall bracket, and in addition, it can block the metal particles above the arc wall bracket to prevent them from falling back down. Description of the Drawings

[0023] Figure 1 is a structural diagram of an embodiment of the present invention;

[0024] Figure 2 is an exploded view of the housing of an embodiment of the present invention;

[0025] Figure 3 is a partial cross-sectional view of an embodiment of the present invention;

[0026] Figure 4 is a structural diagram of the base of an embodiment of the present invention;

[0027] Figure 5 is a top view of the base of an embodiment of the present invention;

[0028] Figure 6 is the structure of the middle cover of an embodiment of the present invention Figure 1 ;

[0029] Figure 7 is the structure of the middle cover of an embodiment of the present invention Figure 2 ;

[0030] Figure 8 is a structural diagram of the upper cover of an embodiment of the present invention;

[0031] Figure 9 The structure of the arc extinguishing component according to the embodiment of the present invention Figure 1 ;

[0032] Figure 10 The structure of the arc extinguishing component according to the embodiment of the present invention Figure 2 ;

[0033] Figure 11 The structural diagram of the arc separating wall bracket according to the embodiment of the present invention;

[0034] Figure 12 The structural diagram of the static contact according to the embodiment of the present invention;

[0035] Figure 13 The assembly diagram of the convex column and the static contact according to the embodiment of the present invention. Specific embodiments

[0036] An embodiment of the circuit breaker with a built-in zero-fly arc structure of the present invention is as Figure 1-13 shown: It includes a housing 1, the housing 1 is assembled by a base 13, a middle cover 12 and an upper cover 11. Multiple sets of moving and static contact assemblies and an arc extinguishing component 3 for extinguishing the arc when each set of moving and static contact assemblies is disconnected are arranged in the housing 1. The moving and static contact assemblies include a moving contact 21 and a static contact 22 for cooperating with the on-off. The base 13 is provided with a plurality of grooves 131 for accommodating each set of moving and static contact assemblies. A plurality of convex columns 121 are provided at the lower part of the middle cover 12. When the middle cover 12 and the base 13 are assembled, the plurality of convex columns 121 can be correspondingly inserted into the respective grooves 131 and simultaneously joined to the bottom inner wall of the grooves 131. The joining is at least a tightly contacting fit. The convex column 121 has a through hole 1211 communicating the upper part of the middle cover 12 and the lower end of the convex column 121. The arc extinguishing component 3 is arranged in the through hole 1211, and the arc extinguishing component 3 can be inserted into the through hole 1211 from the upper end of the through hole 1211 at the upper part of the middle cover 12, so that the arc extinguishing component 3 can be plug-and-play. When the upper cover 11 is assembled with the middle cover 12, it can close the upper end of the through hole 1211. The convex column 121 is provided with a first groove 1212 and a second groove 1213 through which the moving contact 21 and the static contact 22 can pass through the through hole 1211 respectively. The moving contact 21 passes through the first groove 1212 and can swing along the opposite inner walls of the first groove 1212. The moving contact 21 and the static contact 22 are in on-off cooperation in the through hole 1211. The convex column 121 is of a cylindrical structure, and there are no other gaps on its peripheral side walls except for the first groove 1212 and the second groove 1213, so it has a good sealing effect. In this way, when the circuit breaker is disconnected, since the air pressure at the rear end of the moving contact 21 is greater than that at the front end, the gas generated during disconnection will flow upward to the upper part of the through hole 1211 with a lower air pressure, thereby improving the arc extinguishing effect.

[0037] When the arc extinguishing component 3 needs to be replaced, only the upper cover 11 and the middle cover 12 need to be separated, and then the arc extinguishing component 3 can be taken out from the upper end of the through hole 1211 for replacement, which makes the maintenance more convenient.

[0038] The groove 131 includes two oppositely arranged inner side walls 1311. A connecting seat 4 is arranged at the bottom inner wall of the groove 131. The convex column 121 includes a first side wall 121a that can be inserted and matched with the connecting seat 4. The first groove 1212 is arranged on the first side wall 121a. The convex column 121 further includes a third side wall 121c arranged opposite to the first side wall 121a. The second groove 1213 is arranged on the third side wall 121c. A slot 221 that is inserted and matched with the inner edge of the second groove 1213 is arranged on the static contact 22 (see Figure 12 , 13 ).

[0039] The cross-section of the connecting seat 4 along its width direction is in an I shape. Two first insertion slots 41 are respectively formed at intervals between the two sides of the connecting seat 4 and the two inner side walls 1311 of the groove 131. Two second insertion slots 42 that are respectively communicated with the two first insertion slots 41 are arranged at the upper end of the connecting seat 4. The first side wall 121a can be inserted into the first insertion slot 41 and the second insertion slot 42 at the same time. The connecting seat 4 includes a connecting rib 43 that separates the two second insertion slots 42. An opening that can be inserted and matched with the connecting rib 43 is arranged at the lower end of the first side wall 121a of the first groove 1212. An opening that facilitates the insertion of the static contact 22 is also arranged at the lower end of the third side wall 121c of the second groove 1213. When the convex column 121 is inserted into the groove 131 and is engaged with the bottom inner wall of the groove 131, the lower end of the first side wall 121a of the convex column 121 is inserted and matched with the connecting seat 4. At the same time, the second groove 1213 at the lower end of the third side wall 121c of the convex column 121 is inserted and matched with the slot 221 of the static contact 22, and the bottom surface of the static contact 22 is flush with the lower end face of the third side wall 121c, which can provide a better positioning effect and improve the sealing performance between the first side wall 121a, the third side wall 121c and the bottom inner wall of the groove 131, preventing metal particles from spraying to the front end and the rear end of the circuit breaker, thereby improving the blowing effect.

[0040] The convex column 121 includes two oppositely arranged second side walls 121b. Concave openings 1311a that can be embedded with the two second side walls 121b of the convex column 121 are correspondingly arranged on the two inner side walls 1311 of the groove 131. The depth of the concave opening 1311a is 0.5 mm to be better adapted to the convex column 121. The moving contact 21 and the static contact 22 can still adopt conventional dimensions. When the convex column 121 is inserted into the groove 131, its two second side walls 121b are engaged with the bottom inner wall of the groove 131, improving the sealing performance between the second side walls 121b and the bottom inner wall of the groove 131.

[0041] A plurality of protrusions 111 are provided at the lower part of the upper cover 11, which can be inserted into the upper ends of the through holes 1211 of the convex columns 121 when the upper cover 11 is joined with the middle cover 12. A concave pit 112 is provided at the lower end of the protrusion 111, and a number of wavy ribs 113 are provided in the concave pit 112. When metal particles and free gas enter above the through hole 1211, the wavy ribs 113 can slow down the speed of the metal particles and free gas, thereby realizing the secondary arc extinguishing function after the arc extinguishing component 3.

[0042] The arc extinguishing component 3 includes an arc separating wall bracket 31, a plurality of arc extinguishing grid plates 32, and support plates 33 connected to both sides of the plurality of arc extinguishing grid plates 32. The arc separating wall bracket 31 includes a side portion 311 closely arranged on the side wall of the through hole 1211 and a top portion 312 covering the upper ends of the plurality of arc extinguishing grid plates 32. The side portion 311 of the arc separating wall bracket 31 includes a third groove 3111 through which the moving contact 21 can movably pass. A gap 5 for metal particles to pass through is left between the top portion 312 of the arc separating wall bracket 31 and the side wall of the through hole 1211. When the circuit breaker is disconnected, the metal particles and free gas generated enter above the arc extinguishing component 3 through the gap 5. Part of the metal particles are retained at the top portion 312 due to the blockage of the top portion 312 of the arc separating wall bracket 31, reducing the falling of metal particles, and thus reducing mechanical failures.

[0043] In order to facilitate the movable arrangement of the moving contact 21 on the arc separating wall bracket, the arc separating wall bracket of the traditional circuit breaker is generally composed of two separate components joined together. However, the arc separating wall bracket 31 in the present invention is an integral structure. The moving contact 21 can be conveniently arranged on the arc separating wall bracket 31 through the opening below the third groove 3111. In particular, the installation and cooperation of the moving contact 21 and the arc separating wall bracket 31 can be realized directly while inserting the arc separating wall bracket 31 downward along the through hole 1211. The overall structure is simple and the assembly process is more convenient. The integral structure of the arc separating wall bracket 31 can reduce the number of parts of the circuit breaker, reduce the production and processing cost, and make the operation of the circuit breaker more reliable.

[0044] An inclined baffle 313 is provided on one side of the top portion 312 of the arc separating wall bracket 31 corresponding to the gap 5. The inclined baffle 313 and the top portion 312 of the arc separating wall bracket 31 are supported by a reinforcing rib 313 to improve the strength of the connection between the inclined baffle 313 and the top portion 312. The inclined baffle 313 can guide the free gas flow and metal particles, and at the same time can limit and block the metal particles to prevent them from falling back from the gap 5.

[0045] The zero-flying arc structure described in the present invention is different from the external zero-flying arc cover of the conventional circuit breaker. It is integrated inside the circuit breaker and has the advantages of simple structure, large utilization rate of space, convenient assembly, and no need for additional accessories.

[0046] When maintaining the circuit breaker of the present invention, only the upper cover 11 needs to be removed and the arc extinguishing component 3 is taken out, then the states of the moving contact 21, the static contact 22 and the arc extinguishing component 3 can be conveniently and intuitively checked, which is convenient for timely replacement. If only the arc extinguishing component 3 is damaged, the new arc extinguishing component 3 can be directly replaced and inserted into the through hole 1211 to complete the maintenance, and the operation is relatively convenient.

[0047] The above embodiments are only one of the preferred specific embodiments of the present invention, and the common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. A circuit breaker with a built-in zero-fly-arc structure, comprising a housing, which is composed of a base, a middle cover and an upper cover assembled together. A moving and static contact assembly and an arc extinguishing assembly are arranged inside the housing. The moving and static contact assembly includes a moving contact and a static contact for cooperating with opening and closing. The base is provided with a groove for accommodating the moving and static contact assembly. Characterized in that: A convex column is arranged at the lower part of the middle cover. When the middle cover and the base are assembled together, the convex column can be inserted into the groove and simultaneously joined with the bottom inner wall of the groove. The convex column has a through hole communicating with the upper part of the middle cover and the lower end of the convex column. The arc extinguishing assembly is arranged in the through hole. When the upper cover is assembled with the middle cover, the upper end of the through hole can be closed. The convex column is provided with a first groove and a second groove through which the moving contact and the static contact can respectively pass through the through hole. The moving contact can swing along the first groove. The moving contact and the static contact cooperate with opening and closing in the through hole. The groove includes two relatively arranged inner side walls. A connecting seat is arranged at the bottom inner wall of the groove. The convex column includes a first side wall that can be cooperatively inserted with the connecting seat. The first groove is arranged on the first side wall. The convex column includes a third side wall opposite to the first side wall. The second groove is arranged on the third side wall.

2. The circuit breaker with a built-in zero-fly-arc structure according to claim 1, Characterized in that: Two first insertion slits are respectively formed at intervals between both sides of the connecting seat and the two inner side walls of the groove. Two second insertion slits respectively communicating with the two first insertion slits are arranged at the upper end of the connecting seat. The first side wall can be simultaneously inserted into the first insertion slits and the second insertion slits. The connecting seat includes a connecting rib for separating the two second insertion slits. An opening that can be cooperatively inserted with the connecting rib is arranged at the lower end of the first side wall of the first groove.

3. The circuit breaker with a built-in zero-fly-arc structure according to claim 1, Characterized in that: The convex column includes two relatively arranged second side walls. Corresponding recesses that can be embedded with the two second side walls of the convex column are arranged on the two inner side walls of the groove.

4. The circuit breaker with a built-in zero-fly-arc structure according to claim 1, Characterized in that: A slot that can be cooperatively inserted with the inner edge of the second groove is arranged on the static contact.

5. The circuit breaker with a built-in zero-fly-arc structure according to claim 1, Characterized in that: A protrusion that can be cooperatively inserted with the upper end of the through hole when the upper cover is assembled with the middle cover is arranged at the lower part of the upper cover. A concave pit is formed at the lower end of the protrusion. A plurality of wavy convex ribs are arranged in the concave pit.

6. The circuit breaker with a built-in zero-fly-arc structure according to any one of claims 1 to 4, Characterized in that: The arc extinguishing assembly includes an arc separating wall bracket, a plurality of arc extinguishing grid sheets and support sheets connected to both sides of the plurality of arc extinguishing grid sheets. The arc separating wall bracket includes a side part closely arranged against the side wall of the through hole and a top part covering the upper ends of the plurality of arc extinguishing grid sheets. The side part of the arc separating wall bracket includes a third groove through which the moving contact can pass through movably. A gap for metal particles to pass through is left between the top part of the arc separating wall bracket and the side wall of the through hole.

7. The circuit breaker with a built-in zero-fly-arc structure according to claim 6, Characterized in that: One side of the top of the arc separation wall bracket corresponding to the gap is provided with an inclined baffle wall.

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