Blocking device of circuit breaker

Abstract

The utility model discloses a plugging device of a circuit breaker. The plugging device comprises a main contact group, an arc contact, a contact support, a plugging piece and an insulating device, the arc contact and the main contact group are connected in parallel and are both fixed on the contact support; the arc contact comprises an arc contact conducting rod, a positioning groove and a main contact conducting rod; an arc contact is welded on the lower bottom surface of the arc contact conducting rod; a main contact is welded at the middle position of the lower bottom surface of the main contact conducting rod; the plugging member is fixedly connected to the arc contact, is located between the arc contact and the main contact, moves synchronously with the arc contact, and separates the arc extinguishing system from the contact system. And the insulating device and the plugging piece form a staggered structure. According to the device, the plugging piece is fixed on the arc contact, an arc extinguishing system and a contact system are effectively isolated, reverse spraying of electric arcs and airflow is prevented, the internal insulation performance of the circuit breaker is improved, the breaking capacity is improved, and the excellent plugging effect is achieved. In addition, the blocking piece in the device is of an independently-arranged structure, maintenance is easier when a fault occurs, and the overall maintenance cost of the device is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of circuit breaker, especially a kind of plugging device of circuit breaker. BACKGROUND

[0002] Circuit breaker is a kind of electrical equipment that can carry and break current under normal working conditions, and quickly cut off current when abnormal situation occurs.

[0003] Arc will be generated in the process of circuit breaker cutting off current, and gas generating element generates gas under the excitation of arc, and blows into the interval of arc extinguishing system grid piece, so that arc is lengthened, and arc is also cooled, which accelerates the extinction of arc. But if the isolation measures between arc extinguishing system and contact system are not good, arc and airflow can be backfired into contact system, thereby affecting internal insulation, and even cause interphase short circuit, which poses a threat to the safety of operating personnel. Therefore, the plugging measure between arc extinguishing system and contact system is particularly important.

[0004] There are also some plugging measures in prior art, but this plugging structure is generally installed behind the moving contact or the moving contact point of main contact, and cannot completely isolate main contact from arc extinguishing system, so that arc backfiring to main contact is easy to occur, thereby affecting plugging effect, and some plugging measures have relatively complicated structure, are inconvenient to maintain, and have high cost. UTILITY MODEL CONTENT

[0005] The utility model provides a kind of plugging device of circuit breaker to solve the problems existing in prior art, which not only has good plugging effect, can effectively isolate arc extinguishing system and contact system, improve internal insulation performance and breaking capacity of circuit breaker, and also has the advantages of independent plugging component setting and easy maintenance.

[0006] Technical scheme: in order to achieve the above-mentioned purpose, the utility model can adopt the following technical scheme:

[0007] A kind of plugging device of circuit breaker, comprising: main contact group, arc contact, contact support, plugging piece and insulation device;The arc contact is parallel with the main contact group and is fixed on the contact support;

[0008] The arc contact includes arc contact point conducting rod, positioning groove and main contact point conducting rod;The arc contact point conducting rod and main contact point conducting rod form a Z-shaped structure with the positioning groove in the middle as the link part;Arc contact point is welded on the lower bottom surface of the arc contact point conducting rod;Main contact point is welded on the lower bottom surface of the main contact point conducting rod;

[0009] The plugging piece is fixedly connected to the arc contact and located between the arc contact and the main contact, an L-shaped groove is arranged above the plugging piece, the groove is wrapped around the positioning groove of the arc contact and the outer part of the main contact conductive rod, and the plugging piece moves synchronously with the arc contact.

[0010] The insulation device is fixed to the base through the static contact insulation piece, and the insulation device and the plugging piece form a staggered structure to prevent arc and backflow of gas.

[0011] Further, the main contact group comprises a plurality of main contacts in parallel.

[0012] Further, a mounting groove matched with the plugging piece is arranged on the opposite side of the main contact conductive rod relative to the main contact, and the mounting groove is a groove structure.

[0013] Further, a riveting through hole matched with the mounting groove is arranged on the plugging piece, and the plugging piece is riveted on the arc contact through the riveting through hole and the groove of the mounting groove.

[0014] Further, a first protruding part and a second protruding part are arranged on the plugging piece.

[0015] Further, when in the open state, the first protruding part and the second protruding part are staggered with the insulation device and the base to achieve arc isolation effect.

[0016] Further, when in the closed state, the contact support is staggered with the base to prevent arc splashing to the back of the contact support when the arc is just generated.

[0017] Further, the insulation device further comprises a first insulation piece and a second insulation piece, the first insulation piece and the second insulation piece are symmetrically arranged, the static contact insulation piece is arranged between the first insulation piece and the second insulation piece, and the static contact insulation piece is fixed on the base through a screw.

[0018] Advantages: the device has the following advantages: 1) the plugging piece is fixed on the arc contact, the arc extinguishing system and the contact system are effectively isolated, backflow of arc and gas is prevented, internal insulation performance of the circuit breaker is improved, breaking capacity is improved, and excellent plugging effect is achieved. 2) the plugging piece is an independently arranged structure, and is easier to maintain when a fault occurs, thereby effectively reducing the overall maintenance cost of the device. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the plugging device in the utility model;

[0020] Figure 2 It is a structural schematic view of the arc contact in the utility model;

[0021] Figure 3 It is the structure schematic view of the plugging piece in the utility model;

[0022] Figure 4 It is the sectional view of the plugging device cooperation in the utility model under the state of the separation of the gate;

[0023] Figure 5 It is the sectional view of the plugging piece and the insulation device cooperation in the utility model under the state of the separation of the gate;

[0024] Figure 6 It is the sectional view of the plugging device cooperation in the utility model under the state of the closing of the gate;

[0025] Figure 7 It is the assembly schematic view of the main contact group, the arc contact and the plugging piece in the utility model.

[0026] In the drawing: 10, contact support;20, main contact group;30, arc contact;301, arc contact conductive rod;302, main contact conductive rod;303, arc contact point;304, positioning groove;305, installation groove;306, main contact point;40, plugging piece;401, first convex part;402, second convex part;403, riveting through hole;50, insulation device;501, first insulation piece;502, second insulation piece;503, static contact insulation piece;60, base. DETAILED DESCRIPTION

[0027] Example 1:

[0028] Please refer to Figures 1-7 The utility model discloses a plugging device of circuit breaker, include: main contact group 20, arc contact 30, contact support 10, plugging piece 40 and insulation device 50, arc contact 30 with main contact group 20 parallel and all fixed on contact support 10, main contact group 20 includes a plurality of main contact parallel.

[0029] Arc contact 30 includes arc contact point conductive rod 301, main contact point conductive rod 302, positioning groove 304 and installation groove 305, arc contact point conductive rod 301 and main contact point conductive rod 302 with the positioning groove 304 of middle as the link part formed a Z type structure, arc contact point conductive rod 301 lower bottom surface welding has arc contact point 303, main contact point conductive rod 302 lower bottom surface middle position welding has main contact point 306, installation groove 305 is located on main contact point conductive rod 302 and with main contact point 306 opposite one side, with plugging piece 40 cooperation, installation groove 305 is the recess structure.

[0030] The plugging piece 40 is fixedly connected on the arc contact 30 and is located between the arc contact point 303 and the main contact point 306, an L-shaped groove is arranged above the plugging piece 40, the groove is wrapped outside the positioning groove 305 of the arc contact 30 and part of the main contact conductive rod 302, the plugging piece 40 moves synchronously with the arc contact 30, and the plugging piece 40 is further provided with a first protruding part 401 and a second protruding part 402.

[0031] The plugging piece 40 is further provided with a riveting through hole 403 matched with the mounting groove 305, and the riveting through hole 403 is riveted on the arc contact 30 in cooperation with the groove of the mounting groove 305.

[0032] The insulation device 50 is fixed on the base 60 through the static contact insulation piece 503, further comprises a first insulation piece 501 and a second insulation piece 502, the first insulation piece 501 and the second insulation piece 502 are symmetrically arranged, the static contact insulation piece 503 is arranged between the first insulation piece 501 and the second insulation piece 502 and is fixed on the base 60 through screws.

[0033] The insulation device 50 and the plugging piece 40 form an interlaced structure to prevent arc and airflow back spray.

[0034] When being located in the open state, the first protruding part 401 and the second protruding part 402 are interlaced with the insulation device 50 and the base 60 to achieve arc isolation effect.

[0035] When being located in the closed state, the contact support 10 is interlaced with the base 60 to prevent arc splashing to the back of the contact support 10 when just arcing.

[0036] In the plugging device, the plugging piece 40 is riveted on the arc contact 30 and is located between the arc contact point 303 and the main contact point 306 and moves synchronously with the arc contact 30, so that the arc extinguishing system and the contact system can be completely separated, the insulation device 50 and the plugging piece 40 form an interlaced structure to prevent arc and airflow back spray, the plugging piece 40 is fixed on the arc contact 30 to completely separate the arc extinguishing system and the contact system, and the internal insulation performance and breaking capacity of the circuit breaker are effectively improved.

Claims

1. A plugging device for a circuit breaker, characterized in that The utility model relates to a kind of arc extinguishing contactor, including: Main contact group, arc contact, contact support, plugging piece and insulation device;The arc contact is parallel with the main contact group and is fixed on the contact support; The arc contact includes arc contact point conducting rod, positioning groove and main contact point conducting rod;The arc contact point conducting rod and main contact point conducting rod form a Z-shaped structure with the positioning groove in the middle as the link; Arc contact point is welded on the lower bottom surface of the arc contact point conducting rod;Main contact point is welded in the middle position of the lower bottom surface of the main contact point conducting rod; The plugging piece is fixedly connected on the arc contact and located between the arc contact point and the main contact point, an L-shaped recess is provided above the plugging piece, the recess is wrapped in the positioning groove of the arc contact and part of the outer main contact point conducting rod;The plugging piece moves synchronously with the arc contact; The insulation device is fixed on the base through the static contact insulation piece;The insulation device and the plugging piece form staggered structure.

2. The plugging device of a circuit breaker according to claim 1, characterized in that: The main contact group includes a plurality of main contacts in parallel.

3. The plugging device of a circuit breaker according to claim 1, characterized in that: The main contact point conducting rod is provided with a mounting groove on the opposite side of the main contact point, and the mounting groove is a groove structure.

4. The plugging device of a circuit breaker according to claim 3, characterized in that: The plugging piece is provided with a riveting through hole matched with the mounting groove, and the plugging piece is riveted on the arc contact through the riveting through hole and the groove of the mounting groove.

5. The plugging device of a circuit breaker according to claim 1, characterized in that: The plugging piece is provided with a first protrusion and a second protrusion.

6. The plugging device of a circuit breaker according to claim 5, characterized in that: When in the open state, the first protrusion and the second protrusion are staggered with the insulation device and the base to achieve arc isolation effect.

7. The plugging device of a circuit breaker according to claim 1, characterized in that: When in the closed state, the contact support is staggered with the base to prevent the arc from splashing to the back of the contact support when the arc is just generated.

8. The plugging device of a circuit breaker according to claim 1, characterized in that: The insulation device further includes a first insulation piece and a second insulation piece;The first insulation piece and the second insulation piece are symmetrically placed, and the static contact insulation piece is placed between the first insulation piece and the second insulation piece and is fixed on the base by screws.

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