CN215869223U - Circuit breaker - Google Patents

Abstract

A circuit breaker comprises a moving contact, a fixed contact, a tripping mechanism and an operating mechanism, wherein the tripping mechanism and the operating mechanism are respectively connected with the moving contact and the fixed contact, the operating mechanism can drive the moving contact to be in contact with and separate from the fixed contact, the tripping mechanism can drive the operating mechanism to trip, an insulating structure is arranged between the tripping mechanism and the operating mechanism, the insulating structure comprises a first insulating part arranged on the tripping mechanism and/or a second insulating part arranged on the operating mechanism, and by arranging the insulating structure between the tripping mechanism and the operating mechanism, the limited space can be effectively utilized on the basis of not changing the existing circuit breaker structure, so that the creepage distance and the electrical clearance between the tripping mechanism and the operating mechanism are effectively improved, and the reliability of the circuit breaker is ensured. The insulating properties of the first insulating member and the second insulating member are preferably provided at the same time, but only one of the first insulating member and the second insulating cover member may be provided, and all of them fall within the scope of the present invention.

Description

Circuit breaker

Technical Field

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

Background

The circuit breaker is usually used for controlling the on-off of a line and cutting off the line when the line has a fault, so that the line and a load are protected. The circuit breaker includes tripping device and operating device, and tripping device can make operating device dropout, cuts off the circuit through operating device drive circuit breaker, but tripping device and operating device include more metal part separately, install in less casing moreover, lead to dielectric property not enough between tripping device and the operating device, creepage distance and electric clearance can't satisfy the needs.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a circuit breaker with excellent dielectric property between a tripping mechanism and an operating mechanism.

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

a circuit breaker comprises a moving contact, a fixed contact, a tripping mechanism and an operating mechanism, wherein the tripping mechanism and the operating mechanism are respectively connected with the moving contact and the fixed contact, the operating mechanism can drive the moving contact to be in contact with and separate from the fixed contact, the tripping mechanism can drive the operating mechanism to trip, an insulating structure is arranged between the tripping mechanism and the operating mechanism, and the insulating structure comprises a first insulating piece arranged on the tripping mechanism and/or a second insulating piece arranged on the operating mechanism.

Preferably, the moving contact comprises a contact rod and a moving contact arranged on the contact rod, a contact boss protruding towards the tripping mechanism is arranged on the contact rod, and a third insulating cover is arranged on the contact boss.

Preferably, the first insulating part comprises a middle insulating cover and a lower insulating cover part which are connected, the middle insulating cover is used for wrapping the tripping mechanism, and the lower insulating cover is used for wrapping the static contact.

Preferably, the tripping mechanism comprises a magnetic yoke and a coil, the middle insulating cover is wrapped on the magnetic yoke, the first insulating part further comprises an upper insulating cover connected with the middle insulating cover, and the upper insulating cover is wrapped on the top of the coil.

Preferably, the fixed contact comprises a contact plate connected with the magnetic yoke and a fixed contact arranged on the contact plate, and the lower insulating cover wraps one end of the contact plate connected with the magnetic yoke.

Preferably, the operating mechanism is mounted on the contact support member, and the second insulating member includes a second insulating cover wrapped on the contact support member, and an insulating boss provided on one side of the second insulating cover.

Preferably, the inner side of the contact support member is provided with a rotating shaft, the second insulating member further comprises a baffle plate connected with the second insulating cover, the baffle plate and the second insulating cover form a limiting groove at an interval, and the limiting groove can drive the baffle plate to be inserted between the side plate and the rotating shaft for limiting when being sleeved on the side plate.

Preferably, the curb plate is equipped with the spacing protruding muscle with pivot dislocation set, the baffle corresponds and is equipped with the spacing boss with pivot complex between pivot and the spacing protruding muscle, and pivot and spacing protruding muscle can follow both sides limit baffle respectively.

Preferably, the middle insulating cover wraps one side, close to the operating mechanism, of the magnetic yoke, a convex point structure protruding towards the magnetic yoke is arranged on the inner side of the middle insulating cover, and a groove structure in limit fit with the convex point structure is arranged on the magnetic yoke.

Preferably, the inner side of the third insulating cover is provided with a clamping jaw, and the contact boss is provided with a clamping groove matched with the clamping jaw.

According to the circuit breaker, the insulation structure is arranged between the tripping mechanism and the operating mechanism, so that the limited space can be effectively utilized on the basis of not changing the structure of the existing circuit breaker, the creepage distance and the electric clearance between the tripping mechanism and the operating mechanism are effectively improved, and the reliability of the circuit breaker is ensured.

In addition, through the third insulating boot parcel on the contact pole, can effectively improve the insulating properties between moving contact and the tripping device.

Drawings

Fig. 1 is a schematic view of the structure of the circuit breaker of the present invention;

figure 2 is a cross-sectional view of the circuit breaker of the present invention;

fig. 3 is an exploded view of the trip mechanism of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 of the present invention;

FIG. 5 is an exploded view of the operating mechanism of the present invention;

FIG. 6 is a schematic view of the construction of a first insulator of the present invention;

fig. 7 is a cross-sectional view of the trip mechanism of the present invention;

FIG. 8 is a schematic view of a third insulating cover according to the present invention;

fig. 9 is a schematic structural view of the movable contact of the present invention;

FIG. 10 is a cross-sectional view A-A of FIG. 9 of the present invention;

figure 11 is a schematic structural view of a contact support of the present invention;

FIG. 12 is a schematic view of the construction of a second insulator of the present invention;

figure 13 is a schematic view of the mating of a second insulator member of the present invention with a contact support member.

Detailed Description

The following describes the circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 13. The circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1 to 5, the circuit breaker of the present invention includes a movable contact 2 and a fixed contact 1, and a tripping mechanism 400 and an operating mechanism 500 respectively connected to the movable contact 2 and the fixed contact 1, wherein the operating mechanism 500 can drive the movable contact 2 to contact with and separate from the fixed contact 1, the tripping mechanism 400 can drive the operating mechanism 500 to trip, and an insulating structure is disposed between the tripping mechanism 400 and the operating mechanism 500, and the insulating structure includes a first insulating member 100 mounted on the tripping mechanism 400 and/or a second insulating member 200 mounted on the operating mechanism 500.

According to the circuit breaker, the insulation structure is arranged between the tripping mechanism 400 and the operating mechanism 500, so that the limited space can be effectively utilized on the basis of not changing the structure of the existing circuit breaker, the creepage distance and the electric clearance between the tripping mechanism 400 and the operating mechanism 500 are effectively improved, and the reliability of the circuit breaker is ensured. The insulating properties of the first insulating member 100 and the second insulating member 200 are preferably provided at the same time, but only one of the first insulating member 100 and the second insulating cover 210 may be provided, and all of them fall within the scope of the present invention.

As shown in fig. 3-4 and 6-7, the first insulating member 100 of this embodiment includes a middle insulating cover 110 and a lower insulating cover 120 connected to each other, where the middle insulating cover 110 is used to wrap the trip mechanism 400, and the lower insulating cover 120 is used to wrap the static contact 1. Specifically, the trip mechanism 400 includes a magnetic yoke and a bracket 420 mounted on the magnetic yoke, at least one movable iron core 430 is disposed inside the bracket 420, a push rod 440 is disposed at one end of the iron core 430 close to the operating mechanism 500, a coil 450 for driving the iron core 430 to move is disposed outside the bracket 420, the coil 450 can drive the iron core 430 to move, and then the iron core 430 drives the push rod 440 to push the operating mechanism 500 to trip;

the yoke is roughly U type structure, and one side that support 420 is located the inboard yoke of yoke and is close to operating device 500 is right yoke 413, well insulating boot 110 parcel is on right yoke 413, is equipped with respectively on well insulating boot 110 and right yoke 413 to be used for dodging the first hole 441 of dodging and the second hole 442 of dodging of push rod 440.

It is understood that the first insulating member 100 may be provided with only one of the middle insulating cover 110 and the lower insulating cover 120, but the insulating effect is better when both are provided. In addition, the yoke of the embodiment of the present year has a U-shaped structure, but other structures may be adopted, and are not particularly limited herein.

Further, the first insulating member 100 further includes an upper insulating cover 130 connected to the middle insulating cover 110, the upper insulating cover 130 is located above the yoke and wraps the top of the coil 450, the upper insulating cover 130 has an arc-shaped structure, and the shape of the upper insulating cover 130 matches the shape of the outer ring of the coil 450. The first insulating part 100 can further improve the insulating property by insulating the coil 450 through the upper insulating cover 130, and the shape of the upper insulating cover 130 is matched with the shape of the outer ring of the coil 450, so that extra space cannot be occupied, and the structure of the existing circuit breaker cannot be influenced.

Further, the static contact 1 includes a contact plate 11 and a static contact 10, the top of the contact plate 11 is connected with the magnetic yoke, the bottom of the contact plate 11 is provided with an arc striking 12 corner, the static contact 10 is arranged at one side of the middle of the contact plate 11 close to the operating mechanism 500, the lower insulating cover 120 wraps the top of the contact plate 11, and the lower insulating cover 120 is provided with an avoiding groove 121 for avoiding the static contact 10. The lower insulating cover 120 is wrapped on the top of the contact plate 11, so that the insulating property of the top of the contact plate 11 can be ensured, the arc striking 12 corner at the bottom of the contact plate 11 can be ensured to contact and attract the arc, and the structure of the existing circuit breaker cannot be influenced. In addition, lower insulating boot 120 can avoid stationary contact 10 through dodging groove 121, exposes stationary contact 10 and extends to the striking 12 angle of bottom as far as possible, can increase the insulating area on contact plate 11, guarantees more comprehensive protective effect to contact plate 11. Of course, the lower insulating cover 120 may be disposed at a distance from the stationary contact 10, and the avoiding groove 121 is not disposed, which falls within the protection scope of the present invention.

Further, the inner side of the middle insulating cover 110 is provided with a convex point structure 111 protruding towards the right magnetic yoke 413, the right magnetic yoke 413 is provided with a groove structure 112 in spacing fit with the convex point structure 111, and the convex point structure 111 can be inserted into the groove structure 112, so that the middle insulating cover 110 and the right magnetic yoke 413 are limited. The middle insulation cover 110 of the present embodiment is provided with two bump structures 111, one of the bump structures 111 is a cylindrical structure, the other bump structure 111 is a rectangular parallelepiped structure, the two bump structures 111 are higher than the avoiding hole and are respectively located at two sides of the avoiding hole, the right yoke 413 is correspondingly provided with two groove structures 112, and the two groove structures 112 are also respectively located at two sides of the second avoiding hole 442. The middle insulation cover 110 is mounted on the magnetic yoke through the bump structure 111 and the groove structure 112, and has the characteristics of convenience in assembly and high reliability. It is understood that the number of the bump structures 111 can be adjusted, for example, one or more than three bump structures 111 can also take other shapes, and the number and the shape of the groove structures 112 correspond to those of the bump structures 111.

As shown in fig. 11-13, the structure of the second insulating member 200, the operating mechanism 500 and the contact supporting member 510 of the present embodiment are respectively installed on the contact supporting member 520, the operating mechanism 500 drives the movable contact 2 to move through the contact supporting member 510 (see fig. 5), the second insulating member 200 includes a second insulating cover 210 wrapped on the contact supporting member 520, and an insulating boss 220 disposed on one side of the second insulating cover 210, the second insulating cover 210 is wrapped on one side of the contact supporting member 520 close to the trip mechanism 400 for insulation, and the insulating boss 220 is located on a side wall of the housing of the contact supporting member 520 close to the bottom side for insulation. The operating mechanism 500 is the prior art, the operating mechanism 500 generally includes a plurality of connecting rods, and a latch and a jump buckle which are mutually in snap-fit, fig. 5 shows only one of the connecting rods, when the latch and the jump buckle are in snap-fit, the whole operating mechanism 500 is in a balanced state, the handle can drive the moving contact 2 to move through the plurality of connecting rods, and when the latch and the jump buckle need to break a circuit, the latch and the jump buckle can be tripped under the action of other mechanisms, so that the operating mechanism 500 is unlocked and the moving contact 2 and the static contact 1 are driven to be separated.

The contact support member 520 of the present embodiment is a sheet metal part, the second insulating member 200 is an injection molded part, and the second insulating member 200 is wrapped on the contact support member 520 through the second insulating cover 210, so that the insulating property of the contact support member 520 is improved, and the insulating boss 220 on the side surface of the second insulating cover 210 can further improve the insulating effect. It should be understood that the contact rod 21 may be formed by injection molding instead of the injection molding and then integrally injection molding with the third insulating cover 300, which leads to a complicated structure, difficult injection molding and high rejection rate, but all fall within the protection scope of the present invention.

Specifically, the contact support 520 includes two clamping plates 521 disposed oppositely, and a side plate 522 and a rotating shaft 523 connected between the two clamping plates 521, where the two clamping plates 521 are respectively provided with a shaft hole 524 matching with the rotating shaft 523; the second insulating part 200 further comprises a baffle 230 connected with the second insulating cover 210, a limiting groove 240 is formed between the baffle 230 and the second insulating cover 210 at an interval, when the limiting groove 240 can be sleeved on the side plate 522, the baffle 230 can be driven to be inserted between the side plate 522 and the rotating shaft 523 for limiting, and meanwhile, the insulating boss 220 can be driven to be inserted between two clamping plates 521 in fig. 5, and between the outer side of the left clamping plate 521 and the side wall of the shell. Generally, the operating mechanism 500 includes a plurality of rotatably connected links, at least two of the links are a latch and a jump buckle which are in snap-fit with each other, the operating mechanism 500 is in a trip state when the latch and the jump buckle are separated, and the operating mechanism 500 may take various structures, which are not limited in detail herein.

Further, the side plate 522 is provided with a limit convex rib 525 which is arranged in a staggered manner with the rotating shaft 523, the baffle 230 is provided with a limit boss 526 which is matched with the rotating shaft 523 and corresponds to the space between the rotating shaft 523 and the limit convex rib 525, and the limit boss 526 is provided with an arc-shaped transition surface 527 which is matched with the outer ring shape of the rotating shaft 523. When the shutter 230 is assembled, the shutter 230 goes over the limit rib 525 from the direction a in fig. 13, and is inserted between the rotating shaft 523 and the side plate 522, and then the rotating shaft 523 is inserted into the contact support 520, and the shutter 230 is moved from both sides by the rotating shaft 523 and the limit rib 525. By effectively using the space inside the contact support member 520 to install the second insulating member 200, not only is it convenient to assemble, but also the structure of the existing circuit breaker is not affected.

As shown in fig. 8-10, a third insulating cover 300 is disposed on the movable contact 2, the movable contact 2 includes a contact rod 21 and a movable contact 20, one end of the contact rod 21 is connected to the operating mechanism 500, the movable contact 20 is disposed at the other end of the contact rod 21, a contact boss 22 protruding toward the trip mechanism 400 is disposed in the middle of the contact rod 21, a push rod 440 of the trip mechanism 400 can strike the contact boss 22 to accelerate the movement of the contact rod 21 after the operating mechanism 500 is pushed to trip, so that the movable contact 2 is more quickly away from the stationary contact 1, the third insulating cover 300 is wrapped on the contact boss 22, a pawl 310 is disposed on the inner side of the third insulating cover 300, and a clamping slot 311 matched with the pawl 310 is disposed on the contact boss 22.

The contact rod 21 of this embodiment is a sheet metal component, and the third insulating cover 300 is an injection molding, and wraps up on the contact rod 21 through the third insulating cover 300, and can effectively improve the insulating properties between the moving contact 2 and the tripping mechanism 400. It is understood that the contact rod 21 and the contact support 510 may be formed by injection molding instead of injection molding and then integrally injection molding with the third insulating cover 300, which is a complicated structure and high rejection rate due to injection molding difficulty, but they are within the protection scope of the present invention. Further, the third insulating cover 300 may not be provided, and only the first insulating material 100 and the second insulating material 200 may be provided.

As shown in fig. 2, in the area where the movable contact 2 and the fixed contact 1 are communicated with the arc extinguish chamber 3, arc barriers 4 are disposed on the upper and lower sides of the movable contact 2 and the fixed contact 1 (only the arc barrier 4 in the lower half-shell is shown in the figure, and the arc barrier 4 in the upper half-shell is not shown in the figure), and at least one exhaust hole 5 is disposed below the movable contact 2 and the fixed contact 1 on one side of the arc barrier 4 corresponding to the movable contact 2 and the fixed contact 1.

Furthermore, at least one exhaust hole 5 is formed in the position, corresponding to the breaking position of the movable contact 2, of the arc isolating plate 4 below the movable contact 2, the exhaust hole 5 is used for discharging air pressure generated by electric arc when the breaker is broken, the air pressure below the movable contact 2 and the fixed contact 1 is lower than the air pressure above the movable contact 2 and the fixed contact 1, and therefore the electric arc generated by breaking flows downwards to enter the arc extinguishing chamber 3.

Further, the arc baffle 4 is made of a gas generating material, a magnetic conduction plate (not shown in the figure) is arranged on the back of the arc baffle 4, and a groove is formed in the arc baffle 4 and used for increasing the creepage distance.

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 (10)

1. A circuit breaker, characterized by: the novel contactor comprises a moving contact (2), a fixed contact (1), a tripping mechanism (400) and an operating mechanism (500), wherein the tripping mechanism (400) and the operating mechanism (500) are respectively connected with the moving contact (2) and the fixed contact (1), the operating mechanism (500) can drive the moving contact (2) to contact with and separate from the fixed contact (1), the tripping mechanism (400) can drive the operating mechanism (500) to trip, an insulating structure is arranged between the tripping mechanism (400) and the operating mechanism (500), and the insulating structure comprises a first insulating part (100) installed on the tripping mechanism (400) and/or a second insulating part (200) installed on the operating mechanism (500).

2. The circuit breaker of claim 1, wherein: the moving contact (2) comprises a contact rod (21) and a moving contact (20) arranged on the contact rod (21), a contact boss (22) protruding towards the tripping mechanism (400) is arranged on the contact rod (21), and a third insulating cover (300) is arranged on the contact boss (22).

3. The circuit breaker of claim 1, wherein: the first insulating piece (100) comprises a middle insulating cover (110) and a lower insulating cover (120) which are connected, the middle insulating cover (110) is used for wrapping the tripping mechanism (400), and the lower insulating cover (120) is used for wrapping the static contact (1).

4. The circuit breaker of claim 3, wherein: the tripping mechanism (400) comprises a magnetic yoke and a coil (450), the middle insulating cover (110) is wrapped on the magnetic yoke, the first insulating piece (100) further comprises an upper insulating cover (130) connected with the middle insulating cover (110), and the upper insulating cover (130) is wrapped on the top of the coil (450).

5. The circuit breaker of claim 4, wherein: the static contact (1) comprises a contact plate (11) connected with the magnetic yoke and a static contact (10) arranged on the contact plate (11), and the lower insulating cover (120) wraps one end, connected with the magnetic yoke, of the contact plate (11).

6. The circuit breaker of claim 1, wherein: the operating mechanism (500) is installed on the contact support member (520), and the second insulating member (200) comprises a second insulating cover (210) wrapped on the contact support member (520) and an insulating boss (220) arranged on one side of the second insulating cover (210).

7. The circuit breaker of claim 6, wherein: the inboard of contact support piece (520) is equipped with pivot (523), second insulating part (200) still include baffle (230) of being connected with second insulating boot (210), and baffle (230) and second insulating boot (210) interval form spacing groove (240), and spacing groove (240) cover when on curb plate (522), can drive baffle (230) and insert spacing between curb plate (522) and pivot (523).

8. The circuit breaker of claim 7, wherein: curb plate (522) are equipped with spacing protruding muscle (525) with pivot (523) dislocation set, baffle (230) correspond be equipped with between pivot (523) and spacing protruding muscle (525) with pivot (523) complex spacing boss (526), pivot (523) and spacing protruding muscle (525) can follow both sides spacing baffle (230) respectively.

9. The circuit breaker of claim 4, wherein: well insulating boot (110) parcel is equipped with the protruding bump structure (111) of bellied to the yoke in the yoke is close to operating device (500) one side, be equipped with on the yoke with the spacing complex groove structure (112) of bump structure (111).

10. The circuit breaker of claim 2, wherein: the inner side of the third insulating cover (300) is provided with a clamping jaw (310), and the contact boss (22) is provided with a clamping groove (311) matched with the clamping jaw (310).

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