CN111243912A - Plastic case circuit breaker - Google Patents

Abstract

A molded case circuit breaker. The method is characterized in that: the rotating shaft is provided with a linkage part, the rear end of the lower contact assembly extends backwards to the lower part of the rotating shaft and is provided with a linkage matching part corresponding to the linkage part, when the switch is switched on, the rotating shaft can push the lower contact assembly to rotate upwards to be attached to the upper contact assembly, and when the switch is switched off, the lower contact assembly is separated from the rotating shaft and can rotate downwards automatically. Its advantage lies in when closing a floodgate, the pivot can drive contact assembly action down with lower contact assembly contact, realize contact assembly and last contact assembly's combined floodgate action down, during the separating brake, the pivot can separate with lower contact assembly again, lower contact assembly can open downwards automatically, especially after the electronic repulsion that short-circuit current produced has been superimposed, it is faster with lower contact assembly's speed of opening to go up contact assembly, not only effectively increased the biggest opening distance, still play and lengthen electric arc fast, effectively extinguish electric arc's effect, and can improve circuit breaker rated operating voltage greatly, simple structure simultaneously, and convenient assembling.

Description

Plastic case circuit breaker

Technical Field

The invention relates to the field of low-voltage electric appliances, in particular to a molded case circuit breaker.

Background

In order to improve the breaking speed of the moving contact and the static contact, enlarge the opening distance and improve the arc extinguishing efficiency, the contact structure of some circuit breakers is set to be a structure with the repulsive static contact.

Generally, the contact structure is characterized in that a fixed contact is hinged to a bracket, the bracket is fixed to a base, and a torsion spring capable of lifting the fixed contact is arranged on the bracket. When the switch is switched off, the static contact can be repelled to move downwards under the action of electric repulsion, so that the opening distance is increased, the breaking speed is increased, and after the switch is switched off, the static contact can also move upwards to reset under the action of the torsion spring so as to ensure the reliable connection and contact of the moving contact and the static contact during the switch-on.

Also, as disclosed in the chinese invention patent (CN 103617927B), a large-open-distance contact structure capable of fast breaking is disclosed, in which a link rod is used to realize the mutual linkage of a moving contact and a stationary contact, so that the stationary contact rotates in the opposite direction to the moving contact to form the mutual attachment or separation, thereby increasing the maximum open distance between the moving contact and the stationary contact, but the breaking speed of the contact structure is limited by the action time of the operating mechanism, so the improvement of the breaking capacity is also limited, and the overall structure is more complex, and a plurality of parts need to be integrated together during assembly, which makes the assembly very difficult, and the process feasibility is lower.

Disclosure of Invention

In order to overcome the defects of the background art, the invention provides a molded case circuit breaker.

The technical scheme adopted by the invention is as follows: a molded case circuit breaker comprises a base, a surface cover, a first wiring terminal, an arc extinguish chamber, a lower contact assembly, an upper contact assembly, a rotating shaft, an operating mechanism, a tripping mechanism and a second wiring terminal, wherein the first wiring terminal, the arc extinguish chamber, the lower contact assembly, the upper contact assembly, the rotating shaft, the operating mechanism, the tripping mechanism and the second wiring terminal are arranged in the base; the lower contact assembly is rotatably arranged on a bracket fixed on the base through a hinge shaft, the upper contact assembly is arranged on a rotating shaft, and the rotating shaft can drive the upper contact assembly to move and be connected with or separated from the lower contact assembly; the rotating shaft is provided with a linkage part, the rear end of the lower contact assembly extends backwards to the lower part of the rotating shaft and is provided with a linkage matching part corresponding to the linkage part, when the switch is switched on, the rotating shaft can push the lower contact assembly to rotate upwards to be attached to the upper contact assembly, and when the switch is switched off, the lower contact assembly is separated from the rotating shaft and can rotate downwards automatically.

The linkage part on the rotating shaft is of a circular arc structure.

And an elastic piece capable of driving the lower contact assembly to rotate downwards is arranged between the lower contact assembly and the support.

The elastic part is of a double-torsion spring structure and comprises two spring bodies and a U-shaped connecting rod for connecting the two spring bodies, and elastic rods extend out of the two spring bodies; two spring bodies of the elastic part are sleeved outside the hinge shaft and are respectively arranged on two sides of the lower contact component, the U-shaped connecting rod abuts against the lower contact component, and the elastic rod abuts against the support.

The lower contact assembly comprises a lower contact and a lower contact support, the lower contact support is sleeved outside the lower contact, two sides of the lower contact support are integrally formed with a C-shaped isolation cover with an opening at the lower end, and the elastic piece is arranged in the isolation cover.

The surface cover is fixedly arranged on the base and is provided with an exhaust port corresponding to the arc extinguish chamber; be equipped with the arc separation cover that separates explosion chamber and first binding post mutually in the base, the arc separation cover includes baffle and the exhaust passage that extends towards first binding post direction, exhaust passage extends to first binding post's opposite side.

The exhaust passage comprises an inlet passage and an outlet passage, wherein the inlet passage is of a necking structure, and the size of an inlet of the inlet passage is larger than that of an outlet of the inlet passage.

The side wall of the exhaust channel is at least provided with a convex stopping boss.

The exhaust passages are arranged in two groups and are respectively arranged at the two side edges of the partition board, a plurality of guide grooves are formed in the back surface of the partition board, and the guide grooves extend from the middle of the partition board to the exhaust passages at the two sides.

Arc striking pieces are arranged below the arc extinguishing chamber, one end of each arc striking piece is connected with a first wiring terminal, and the other end of each arc striking piece extends to the position below the lower contact assembly and bends towards the arc extinguishing chamber.

The invention has the beneficial effects that: scheme more than adopting, during the combined floodgate, the pivot can drive down contact assembly action with lower contact assembly contact, realize contact assembly and last contact assembly's combined floodgate action down, during the separating brake, the pivot can separate with lower contact assembly again, lower contact assembly can open downwards automatically, especially after the electronic repulsion that the short-circuit current produced has been superimposed, it is faster with the speed that lower contact assembly opened to go up contact assembly, not only effectively increased the biggest opening distance, still play and lengthen electric arc fast, effectively extinguish electric arc's effect, and can improve circuit breaker rated operating voltage greatly, simple structure simultaneously, and convenient assembling.

Drawings

Fig. 1 is a schematic structural diagram of a molded case circuit breaker according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of the molded case circuit breaker according to the embodiment of the present invention when closing.

Fig. 3 is a cross-sectional view of the molded case circuit breaker according to the embodiment of the present invention when opening.

Fig. 4 is a schematic structural diagram of a rotating shaft according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a lower contact assembly, a bracket and an elastic member according to an embodiment of the invention.

Fig. 6 is a schematic structural diagram of a lower contact assembly according to an embodiment of the invention.

Fig. 7 is a schematic structural diagram of an elastic member according to an embodiment of the invention.

Fig. 8 is a schematic structural diagram of a lower contact assembly, an arc extinguishing chamber, a first connecting terminal and an arc striking member according to an embodiment of the present invention.

Fig. 9 is a schematic structural view of an arc striking member according to an embodiment of the present invention.

Fig. 10 is a sectional view of a molded case circuit breaker according to an embodiment of the present invention.

Fig. 11 is an enlarged schematic view at a in fig. 10.

Fig. 12 is a schematic structural view of an arc-isolating shield according to an embodiment of the present invention.

Detailed Description

The embodiments of the invention will be further described with reference to the accompanying drawings in which:

as shown in fig. 1 to 7, a molded case circuit breaker includes a base 1, a surface cover 2, and a first connection terminal 3, an arc extinguish chamber 4, a lower contact assembly 5, an upper contact assembly 6, a rotating shaft 7, an operating mechanism 8, a trip mechanism 9, and a second connection terminal 10 disposed in the base 1.

The lower contact assembly 5 includes a lower contact 51 and a lower contact support 52, the lower contact support 52 is sleeved outside the lower contact 51 and connected with the lower contact 51 to form a whole, the lower contact support 52 can substantially cover the upper side and two side walls of the lower contact 51, the front end of the lower contact 51 is exposed outside the lower contact support 52 and forms a lower contact, and the lower end of the lower contact 51 is formed with a wiring boss and can be connected with the first wiring terminal 3 through a flexible connection wire.

A bracket 12 is fixedly installed in the base 1, and a mounting hinge hole is formed at a position of the lower contact 51 corresponding to a position of the lower contact support 52 near the middle portion, so that the lower contact assembly 5 can be rotatably installed on the bracket 4 through the hinge shaft 11.

The rotating shaft 7 is rotatably installed in the base 1 and is in linkage connection with the operating mechanism 8, the rotating shaft can rotate under the driving of the operating mechanism 8, the upper contact assembly 6 is installed on the rotating shaft 7, the front end of the upper contact assembly 2 is connected with the upper contact corresponding to the lower contact of the lower contact assembly 5, the other end of the upper contact assembly is connected with the second wiring terminal 10 through a flexible connection wire, the upper contact assembly 2 can rotate along with the rotating shaft 7, the upper contact assembly is communicated when the upper contact is in contact with the lower contact, and the upper contact assembly is disconnected when the upper contact is separated from the lower contact.

The rotating shaft 7 is provided with a linkage part 71, the rear end of the lower contact support 52 extends backwards to the lower part of the rotating shaft 7, and is provided with a linkage matching part 501 corresponding to the linkage part 71, and the rotating shaft 7 can push the lower contact assembly 5 to rotate upwards to be attached to the upper contact assembly 6 during closing.

The linkage portion 71 is of an arc-shaped protruding structure, and when the linkage portion 71 is in contact fit with the linkage matching portion 501, friction can be reduced, and the action is more stable and reliable.

During closing, the rotating shaft 7 can drive the upper contact assembly 6 to rotate downwards, and meanwhile, the linkage part 71 of the upper contact assembly is in contact with the linkage matching part 501 of the lower contact assembly 5 to push the lower contact assembly 5 to rotate upwards, so that the upper contact assembly 6 is attached to the lower contact assembly 5 to realize closing;

during opening, the rotating shaft 7 drives the upper contact assembly 6 to rotate upwards under the combined action of the reset elastic force and the electric repulsive force of the operating mechanism, and meanwhile, the linkage matching portion 501 of the lower contact assembly 5 loses the contact limitation of the linkage portion 71 of the rotating shaft 7 on the upper contact assembly 5, so that the lower contact assembly 5 can rotate downwards under the action of the electric repulsive force, and the upper contact assembly 6 and the lower contact assembly 5 are separated to realize opening.

The middle of the rotating shaft 7 and the lower contact assembly 5 is in linkage fit with the linkage matching part 501 through the linkage part 71, other connecting parts do not exist between the rotating shaft 7 and the lower contact assembly, compared with the existing structure which needs the middle connecting rod to be hinged to realize linkage fit, the structure is simpler, installation is respectively carried out during installation, the assembly is more convenient, and the process feasibility is higher.

In addition, the rotating shaft 7 is only linked with the lower contact assembly 5 during closing, and the rotating shaft 7 can reset during opening, so that the rotating shaft is separated from the lower contact assembly 5, the lower contact assembly 5 can be repelled downwards by electric repulsion force, the opening distance is increased, electric arcs are lengthened, the breaking performance is improved, the repellent resistance is small, and the breaking speed block is high.

Further, an elastic part 13 capable of driving the lower contact assembly 5 to rotate downwards is further arranged between the lower contact assembly 5 and the support 12, and when the lower contact assembly 5 is opened, the lower contact assembly 5 can be subjected to downward elastic force of the elastic part 13 besides electric repulsive force, so that the action speed of the lower contact assembly 5 is further increased, quick opening is further achieved, and the breaking speed is increased.

The elastic member 13 is a double torsion spring structure, and includes two spring bodies 131 and a U-shaped connecting rod 132 connecting the two spring bodies 131, and elastic rods 133 extend from the two spring bodies 131.

The lower contact assembly 5 is rotatably mounted at the upper end of the bracket 12 through a hinge shaft 11, the two spring bodies 131 of the elastic member 13 are sleeved outside the hinge shaft 11 and are respectively disposed at two sides of the lower contact support 52, the U-shaped link 132 abuts against the lower contact support 52, and the elastic rod 133 abuts against the bracket 12.

By adopting the elastic part 13 and the installation structure thereof, the installation is convenient, the assembly is convenient, the stress is balanced, and the work is stable and reliable.

Two sides of the lower contact support 52 are integrally formed with a C-shaped isolation cover 521, and the elastic element 13 is correspondingly disposed inside the isolation cover 521. Because when the separating brake is disconnected, the lower contact and the elastic element are electrified, and the lower contact support 52 is usually made of an insulating material, so that the effect of insulating and isolating can be achieved, the breakdown between the lower contact assembly 5 and the upper contact assembly 6 is prevented, and the structure of the isolation cover 521 is arranged, so that the elastic element 13 can be further protected, the breakdown between the elastic element 13 and the upper contact assembly 6 is prevented, and the separating brake is safer and more reliable.

Furthermore, an isolation boss 522 is formed downwards at a position of the lower contact support 52 corresponding to the rear end of the isolation cover 521, the U-shaped link abuts against the isolation boss 522, the isolation boss 522 is in a shape like a Chinese character 'tu', and is used as an extension of the isolation cover 521 to further isolate the lower contact from the elastic member, and meanwhile, the isolation boss 522 can position and fix the elastic member 7.

In addition, the bracket 12 is bent to form a convex structure, an arc-shaped limiting groove 121 matched with the elastic rod 133 is formed at the rear side of the convex shoulder position of the bracket 12, the elastic rod 133 abuts against the two convex shoulders of the bracket 12 and is correspondingly clamped in the arc-shaped limiting groove 121, and the whole installation of the elastic part is firmer and more stable.

As shown in fig. 8-9, the arc extinguishing chamber 4 is arranged between the first wiring terminal 3 and the lower contact assembly 5, an arc striking piece 15 is arranged below the arc extinguishing chamber 4, one end of the arc striking piece 15 is connected with the first wiring terminal 3, the other end of the arc striking piece extends to the lower part of the lower contact assembly 5 and bends towards the arc extinguishing chamber 4, when the lower contact assembly 5 is disconnected with the upper contact assembly, electric arcs on the lower contact assembly 5 can be quickly led into the arc extinguishing chamber 4 through the arc striking piece 15, the arc extinguishing performance is further improved, and the breaking safety and reliability are guaranteed.

As shown in fig. 1 and fig. 10 to 12, the surface cover 2 is fixedly mounted on the base 1, and the surface cover 2 is provided with an exhaust port 21 corresponding to the arc extinguishing chamber 4; be equipped with in the base 1 and separate arc cover 14 that arc extinguishing chamber 4 and first binding post 3 separate mutually, arc cover 14 includes baffle 141 and the exhaust passage 142 that extends towards first binding post 3 direction, the extension length of exhaust passage 142 is not less than the length size that first binding post 3 corresponds the direction to extend to first binding post's opposite side.

When the lower contact assembly 5 is disconnected from the upper contact assembly 6, the arc introduction into the arc chute 4 is extinguished, and the generated gas can be exhausted through the exhaust port 21 and the exhaust passage 142. On the basis of the original exhaust port 21, an exhaust channel 142 is further added, so that the exhaust pressure at the upper end exhaust port 31 is effectively relieved, and the overall performance is improved.

The arc-extinguishing cover 14 can effectively isolate the first wiring terminal 3 from the arc-extinguishing chamber 4 through the partition plate 141, and the exhaust channel 142 extends to the outer side position of the first wiring terminal 3 towards the direction of the first wiring terminal 3, so that the reliable isolation and arc-extinguishing functions of the arc-extinguishing cover can be still ensured after the exhaust function of the arc-extinguishing cover is increased.

The exhaust passage 142 includes an inlet passage and an outlet passage, the inlet passage is of a necking structure, the inlet size of the inlet passage is larger than that of the outlet passage, and the inlet size is increased as much as possible, so that gas in a larger range can enter the inlet passage and then be exhausted through the outlet passage, and the exhaust effect is further improved.

The lateral wall of exhaust passage 142 is formed with a convex boss 143 that blocks at least, blocks boss 143 and makes exhaust passage 22 form the effect of a turn passageway, blocks thereby the boss 143 can be blocked by the boss 143 and block and form the turn when the air current process, and it can prevent that the air current from directly spouting, keeps apart and blocks high temperature granule to effectively reduce the damage of air current to external equipment and circuit.

Exhaust passage 142 is equipped with two sets ofly to set up respectively in the both sides limit position of baffle 21, laminate mutually with base 1 lateral wall, overall layout is reasonable, when guaranteeing exhaust, avoids blockking first binding post 3, makes things convenient for first binding post 3's wiring operation.

During specific installation, the arc-isolating cover 14 is directly inserted into the base 1 in an inserting mode, and then the arc-isolating cover 14 is pressed through the face cover 2, so that the structure is simple, and the installation is convenient.

Further, a plurality of guide grooves 144 are formed on the back surface of the partition plate 141, the guide grooves 144 extend from the middle of the partition plate 141 toward the exhaust channel 142, and the guide grooves 144 can guide the airflow so that the airflow can be rapidly exhausted through the exhaust channel 142 along the guide grooves 144, thereby further increasing the exhaust effect.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The skilled person should understand that: although the invention has been described in terms of the above specific embodiments, the inventive concept is not limited thereto and any modification applying the inventive concept is intended to be included within the scope of the patent claims.

Claims (10)

1. A molded case circuit breaker comprises a base (1), a surface cover (2), and a first wiring terminal (3), an arc extinguish chamber (4), a lower contact assembly (5), an upper contact assembly (6), a rotating shaft (7), an operating mechanism (8), a tripping mechanism (9) and a second wiring terminal (10) which are arranged in the base (1); the lower contact assembly (5) is rotatably arranged on a bracket (12) fixed on the base (1) through a hinged shaft (11), the upper contact assembly (6) is arranged on a rotating shaft (7), and the rotating shaft (7) can drive the upper contact assembly (6) to act and is connected with or separated from the lower contact assembly (5);

the method is characterized in that: a linkage part (71) is formed on the rotating shaft (7), the rear end of the lower contact assembly (5) extends backwards to the lower part of the rotating shaft (7), and a linkage matching part (501) corresponding to the linkage part (71) is formed; during switching on, the rotating shaft (7) can push the lower contact assembly (5) to rotate upwards to be attached to the upper contact assembly (6), and during switching off, the lower contact assembly (5) is separated from the rotating shaft (7) and can rotate downwards automatically.

2. The molded case circuit breaker according to claim 1, wherein: the linkage part (71) is of an arc-shaped structure.

3. The molded case circuit breaker according to claim 1, wherein: an elastic piece (13) capable of driving the lower contact assembly (5) to rotate downwards is further arranged between the lower contact assembly (5) and the support (12).

4. A molded case circuit breaker according to claim 3, wherein: the elastic piece (13) is of a double-torsion spring structure and comprises two spring bodies (131) and a U-shaped connecting rod (132) connected with the two spring bodies (131), and elastic rods (133) extend from the two spring bodies (131); two spring bodies (131) of the elastic part (13) are sleeved outside the hinge shaft (11) and are respectively arranged on two sides of the lower contact component (5), the U-shaped connecting rod (132) abuts against the lower contact component (5), and the elastic rod (133) abuts against the support (12).

5. A molded case circuit breaker according to claim 3, wherein: the lower contact assembly (5) comprises a lower contact (51) and a lower contact support (52), the lower contact support (52) is sleeved outside the lower contact (51), two sides of the lower contact support (52) are integrally formed with a C-shaped isolation cover (521) with a lower end opening, and the elastic piece (13) is arranged in the isolation cover (521).

6. A molded case circuit breaker according to any one of claims 1 to 5, characterized in that: the surface cover (2) is fixedly arranged on the base (1), and an exhaust port (21) corresponding to the arc extinguish chamber (4) is formed in the surface cover (2);

be equipped with in base (1) and separate arc cover (14) that arc extinguish chamber (4) and first binding post (3) separate mutually, separate arc cover (14) including baffle (141) and towards exhaust passage (142) that first binding post (3) direction extended, exhaust passage (142) extend to the opposite side of first binding post (3).

7. The molded case circuit breaker according to claim 6, wherein: the exhaust passage (142) comprises an inlet passage and an outlet passage, wherein the inlet passage is of a necking structure, and the inlet size of the inlet passage is larger than the outlet size of the inlet passage.

8. The molded case circuit breaker according to claim 6, wherein: the side wall of the exhaust passage (142) is formed with at least one protruding stopper projection (143).

9. The molded case circuit breaker according to claim 6, wherein: two groups of exhaust channels (142) are arranged and are respectively arranged at the two side edges of the partition plate (141), a plurality of guide grooves (144) are formed in the back of the partition plate (141), and the guide grooves (144) extend from the middle of the partition plate (141) to the exhaust channels (142) at the two sides.

10. The molded case circuit breaker according to claim 1, wherein: arc striking spare (15) are equipped with to explosion chamber (4) below, first binding post (3) is connected to arc striking spare (15) one end, and the other end extends to the below of lower contact subassembly (5) and buckles towards explosion chamber (4).

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