Arc extinguishing structure of double-air-blowing universal circuit breaker

Abstract

The utility model discloses an arc extinguishing structure of a double-air-blowing universal circuit breaker, which comprises a circuit breaker shell, an opening and closing action cavity is arranged in the circuit breaker shell, a moving contact and a static contact are arranged in the cavity, an arc extinguishing chamber is arranged above the cavity, an arc extinguishing grid sheet is arranged in the arc extinguishing chamber, the static contact comprises a copper busbar and a silver contact, and the copper busbar is connected with the silver contact. The copper busbar is provided with a groove, the silver contact is arranged on one side of the groove and is in movable contact with the moving contact, and the gas generating piece I. Compared with a traditional universal circuit breaker arc extinguishing structure, the gas generating piece I and the gas generating piece II matched with the arc extinguishing chamber grid piece are additionally arranged on the static contact, a large amount of heat is generated by electric arcs in the breaking process of the circuit breaker, and the arc extinguishing effect is improved. According to the above structure, the electric arc leaves the contact from the root part, the electric arc is quickly blown into the arc extinguish chamber, the extinguishing speed of the electric arc is accelerated, and the breaking capacity of the circuit breaker is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing structure of a double-air-blowing universal circuit breaker. Background Art

[0002] Universal circuit breakers, also known as frame circuit breakers, are mechanical switchgear that can connect, carry and disconnect currents under normal circuit conditions, and can also connect, carry for a certain time and disconnect currents under specified abnormal circuit conditions. Universal circuit breakers are used to distribute electrical energy and protect circuits and power equipment from overload, undervoltage, short circuit, etc.

[0003] At present, the arc extinguishing structure of the universal circuit breaker generally includes an arc extinguishing chamber, which is arranged above the moving contact and the static contact. An air blowing piece structure is arranged at the bottom of some arc extinguishing chambers. When the electric arc heats the air blowing piece, air is generated to effectively blow the arc toward the arc extinguishing chamber. In actual application, the position of the air blowing piece is too high, and the arc generated at the contact position of the moving and static contacts still causes serious burning of major contact conductive parts such as the arc contact, the main contact silver point, and the static contact silver point. Therefore, the arc extinguishing structure of the current universal circuit breaker still has the problem of unsatisfactory arc extinguishing effect. Summary of the invention

[0004] The purpose of the utility model is to solve the above technical problems and provide an arc extinguishing structure for a double-air-blowing universal circuit breaker, which has a reasonable structural design and greatly improves the arc extinguishing effect of the universal circuit breaker.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the utility model is:

[0006] A double-air-blowing universal circuit breaker arc extinguishing structure, which includes a circuit breaker housing, a closing and opening action chamber is arranged in the circuit breaker housing, a moving contact and a static contact are arranged in the chamber, an arc extinguishing chamber is arranged above the chamber, an arc extinguishing grid is arranged in the arc extinguishing chamber, and is characterized in that: the static contact includes a copper busbar and a silver contact, the copper busbar is provided with a groove, the silver contact is arranged on one side of the groove and is in active contact with the moving contact, and a gas-generating sheet I is fixedly arranged in the groove.

[0007] Furthermore, the gas-generating sheet I is made of POM material and is in a strip shape as a whole, and is placed in the groove. The gas-generating sheet I is provided with bolt holes, and the groove is provided with threaded holes. The gas-generating sheet I is fixedly connected to the copper busbar groove by screws, and the bolt holes are sealed with silicone.

[0008] Furthermore, an arc-striking piece socket is provided on the other side of the copper busbar groove, and the socket is provided with a slot. One end of the L-shaped arc-striking piece is fixedly connected to the slot, and the arc-striking piece functions to guide the arc into the arc extinguishing chamber.

[0009] Furthermore, the lower end of the arc extinguishing grid is an inverted V-shaped opening, and the two corner ends of the V-shaped opening are connected to the gas-generating sheet II. The two ends of the arc extinguishing grid are fixed by a grid fixing plate; the grid fixing plate is provided with a mounting hole, and the gas-generating sheet II is fixedly connected to the grid fixing plate.

[0010] The beneficial effects of the utility model are as follows: compared with the traditional arc extinguishing structure of the universal circuit breaker, the device adds a gas-generating sheet I on the static contact, which is arranged on one side of the silver contact, and cooperates with the gas-generating sheet II at the lower end of the arc extinguishing chamber grid. During the circuit breaker breaking process, the arc generates a large amount of heat, so that the gas-generating material decomposes to enhance the gas blowing effect, so that the arc leaves the contact from the contact part of the contact, and the arc is quickly blown into the arc extinguishing chamber, which speeds up the arc extinguishing speed and greatly improves the breaking capacity of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0012] Figure 2 This is a schematic diagram of the structure of the static contact of the embodiment of the utility model;

[0013] Figure 3 This is a schematic diagram of the structure of the edge pressure plate of the utility model;

[0014] 1-shell, 2-arc extinguishing grid, 3-moving contact, 4-static contact, 5-gas generating plate I, 6-gas generating plate II, 10-grid fixing plate, 41-copper busbar, 43-silver contact, 44-socket, 45-arc striking plate. DETAILED DESCRIPTION

[0015] As attached Figure 1-3 A double air-blowing universal circuit breaker arc extinguishing structure is shown, which includes a circuit breaker housing 1, a closing and opening action chamber is arranged in the circuit breaker housing, a moving contact 33 and a static contact 44 are arranged in the chamber, an arc extinguishing chamber is arranged above the chamber, an arc extinguishing grid 2 is arranged in the arc extinguishing chamber, the static contact 4 includes a copper busbar 41 and a silver contact 43, the copper busbar 41 is provided with a groove, the silver contact 43 is arranged on one side of the groove and is in active contact with the moving contact 3, and a gas-generating sheet Ⅰ5 is fixedly arranged in the groove.

[0016] Furthermore, the gas-generating sheet I5 is made of POM material and is in a strip shape as a whole, and is placed in the groove. The gas-generating sheet I5 is provided with bolt holes, and the groove is provided with threaded holes. The gas-generating sheet I5 is fixedly connected to the groove of the copper busbar 41 by screws, and the bolt holes are sealed with silicone.

[0017] Furthermore, an arc-striking piece socket 44 is provided on the other side of the groove of the copper busbar 41. The socket is provided with a slot. One end of an L-shaped arc-striking piece 45 is fixedly connected to the slot. The arc-striking piece serves to guide the arc into the arc extinguishing chamber, and can be made of cold-rolled steel plate Q235.

[0018] Furthermore, a groove is formed between the socket 44 and the installation position of the silver contact 43, and the static contact silver contact 43 is used to contact the moving contact, and the portion of the socket 44 close to the groove is an arc contact.

[0019] Furthermore, the lower end of the arc extinguishing grid is an inverted V-shaped opening, and the two corner ends of the V-shaped opening are connected to the gas-generating sheet II6. The two ends of the arc extinguishing grid are fixed by a grid fixing plate 10; the grid fixing plate 10 is provided with a mounting hole, and the gas-generating sheet II6 is fixedly connected to the grid fixing plate 10.

[0020] The above is only a preferred embodiment of the present utility model. It should be pointed out that for ordinary technicians in the technical field, several improvements can be made without departing from the principle of the present utility model. These improvements should also be regarded as within the scope of protection of the present utility model without paying creative labor.

Claims

1. A double air-blowing universal circuit breaker arc extinguishing structure, comprising a circuit breaker housing, a closing and opening action chamber is arranged in the circuit breaker housing, a moving contact and a static contact are arranged in the chamber, an arc extinguishing chamber is arranged above the chamber, an arc extinguishing grid is arranged in the arc extinguishing chamber, and the characteristics are: The static contact comprises a copper busbar and a silver contact. The copper busbar is provided with a groove. The silver contact is arranged on one side of the groove and is in active contact with the moving contact. A gas-generating sheet I is fixedly arranged in the groove.

2. The arc extinguishing structure of double air-blowing universal circuit breaker according to claim 1 is characterized in that: The gas generating sheet I is made of POM material and is in a strip shape and is placed in the groove.

3. The arc extinguishing structure of double air-blowing universal circuit breaker according to claim 2 is characterized in that: The gas-generating sheet I is provided with bolt holes, and the groove is provided with threaded holes. The gas-generating sheet I is fixedly connected to the copper busbar groove by screws, and the bolt holes are sealed with silicone.

4. The arc extinguishing structure of double air-blowing universal circuit breaker according to claim 1 is characterized in that: An arc-striking piece socket is arranged on the other side of the copper busbar groove, and the socket is provided with a slot, and one end of the L-shaped arc-striking piece is fixedly connected to the slot.

5. The arc extinguishing structure of double air-blowing universal circuit breaker according to claim 1 is characterized in that: The lower end of the arc extinguishing grid is an inverted V-shaped opening, and the two corners of the V-shaped opening are connected to the gas-generating sheet II. The two ends of the arc extinguishing grid are fixed by a grid fixing plate; the grid fixing plate is provided with a mounting hole, and the gas-generating sheet II is fixedly connected to the grid fixing plate.

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