Switching device

Abstract

A switching device belongs to the technical field of switching devices. Comprising a first contact system and a first arc extinguishing unit, the first contact system comprises a first contact unit and a second contact unit, and the first contact unit and the second contact unit are arranged in parallel and isolated from each other. The first contact unit is provided with a first arc extinguishing unit and comprises a first moving contact and a first static contact which are matched with each other to form a contact pair, and the second contact unit comprises a second moving contact and a second static contact which are matched with each other to form a contact pair. The separation of the first moving contact and the first static contact lags behind the separation of the second moving contact and the second static contact. The utility model has the advantages that the blowing force and the magnetic blowing force to the electric arc can be enhanced by utilizing the narrow slits, the phenomenon of electric arc rollback caused by insulation reduction of a main contact area is avoided, the breaking capacity can be obviously improved, and the breaking reliability of the circuit breaker is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of switching electrical appliances, and particularly relates to a switching device. Background Art

[0002] A circuit breaker is a typical electrical component in the category of switching devices, which can not only carry and break the current in a normal circuit, but also carry and break the current in an abnormal circuit situation within a specified time.

[0003] In the prior art, the contact system of a large frame circuit breaker, i.e., a case type circuit breaker (MCCB) with a large frame size, usually includes a main contact and an arcing contact. Among them, the arcing contact protrudes from the main contact and extends into the arc extinguishing chamber. The arcing contact closes and separates before the main contact. Ideally, when the circuit breaker breaks the arc, the arc is only generated on the arcing contact. Since the arcing contact extends into the arc extinguishing chamber, the arc can be better attracted by the arc extinguishing chamber and cut by the arc extinguishing grid plates in the arc extinguishing chamber, thereby breaking the short-circuit current. However, with the increase of the breaking current, the insulation degradation in the main contact area will cause an arc between the main contact and the static contact. Since this arc is located outside the arc extinguishing chamber, the arc extinguishing chamber cannot quickly extinguish the arc, which may lead to a decrease in the breaking capacity of the circuit breaker, and this technical problem has long troubled the industry. Summary of the Utility Model

[0004] The task of the utility model is to provide a switching device that helps to eliminate the adverse factors causing the decrease in the breaking capacity of the circuit breaker and thus ensures the breaking reliability of the circuit breaker.

[0005] The task of the utility model is completed as follows: A switching device includes a first contact system and a first arc extinguishing unit. The first contact system includes a first contact unit and a second contact unit. The first contact unit and the second contact unit are arranged in parallel and isolated from each other. The first contact unit is configured with a first arc extinguishing unit and the first contact unit includes a first moving contact and a first static contact that are paired as a contact pair. The second contact unit includes a second moving contact and a second static contact that are paired as a contact pair. When the switching device breaks the current, the separation of the first moving contact and the first static contact lags behind the separation of the second moving contact and the second static contact.

[0006] In the utility model, the "isolated from each other" is insulation isolation.

[0007] In the utility model, the insulation isolation is implemented by an insulation partition arranged between the first contact unit and the second contact unit.

[0008] In the present utility model, the switching device further includes a second contact system and a second arc extinguishing unit. The second contact system includes a third contact unit and a fourth contact unit. The third contact unit and the fourth contact unit are arranged in parallel and separated from each other. The third contact unit is configured with a second arc extinguishing unit and the third unit includes a third moving contact and a third static contact that are paired as a contact pair with each other. The fourth contact unit includes a fourth moving contact and a fourth static contact that are paired as a contact pair with each other. When the switching device interrupts the current, the separation of the third moving contact and the third static contact lags behind the separation of the fourth moving contact and the fourth static contact.

[0009] In the present utility model, the "separated from each other" means insulated separation.

[0010] In the present utility model, the insulated separation is implemented by an insulating plate provided between the third contact unit and the fourth contact unit.

[0011] In the present utility model, the first contact system and the second contact system correspond to each other left and right.

[0012] In the present utility model, the first contact system and the second contact system are separated.

[0013] In the present utility model, the "separated" means insulated separation.

[0014] In the present utility model, the insulated separation is implemented by an insulating separation plate provided between the first contact system and the second contact system.

[0015] The technical solution provided by the present utility model is designed with a first contact unit and a second contact unit in the structural system of the first contact system. The first contact unit includes a first moving contact and a first static contact, and the second contact unit includes a second moving contact and a second static contact. Also, since the first and second contact units are designed to be arranged in parallel and isolated from each other, and since the first contact unit is configured with a first arc extinguishing chamber and lags behind the second contact unit in operation when the switching device interrupts the current; it can utilize the narrow slit to strengthen the blowing force and magnetic blowing force on the arc, avoid the phenomenon of arc backtracking caused by the insulation degradation in the main contact area, significantly improve the breaking capacity, and ensure the breaking reliability of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Please refer to Figure 1, a first contact system 1 and a first arc extinguishing unit 2 are shown. The first contact system 1 includes a first contact unit 11 and a second contact unit 12. In this embodiment, the aforementioned first contact unit 11 and second contact unit 12 are arranged in parallel and isolated from each other. The first contact unit 11 is configured with the aforementioned first arc extinguishing unit 2 and the first contact unit 11 includes a first moving contact 111 and a first static contact 112 that are paired as a contact pair with each other. The second contact unit 12 includes a second moving contact 121 and a second static contact 122 that are paired as a contact pair with each other. When the switching device interrupts the current, the separation of the aforementioned first moving contact 111 from the first static contact 112 lags behind the separation of the aforementioned second moving contact 121 from the second static contact 122, so that the aforementioned first contact unit 11 serves as the contact unit for interrupting the short-circuit current, while the second contact unit 12 serves as the contact unit for not interrupting the short-circuit current.

[0018] As Figure 1 shown, the load L is connected in series in the circuit. The first contact unit 11 and the second contact unit 12 are arranged side by side along the first direction D1. A first breaking gap S1 is formed between the first moving contact 111 and the first static contact 112 of the first contact unit 11. Similarly, a second breaking gap S2 is formed between the second moving contact 121 and the second static contact 122 of the second contact unit 12. And according to the foregoing: when the first breaking gap S1 separates, the short-circuit current is interrupted, and the arc of the first breaking gap S1 is extinguished by the first arc extinguishing unit 2, while the second breaking gap S2 does not interrupt the short-circuit current. Of course, if it is designed that the first moving contact 111 of the first contact unit 11 separates from the corresponding static contact before the second moving contact 121 of the second contact unit 12, that is, for interrupting the short-circuit current, it is also feasible that the first moving contact 111 of the first contact unit 11 does not interrupt the short-circuit current.

[0019] In this embodiment, the aforementioned isolation from each other is insulation isolation. More specifically, the insulation isolation is implemented by an insulating partition provided between the aforementioned first contact unit 11 and the second contact unit 12.

[0020] From the above description and in combination with Figure 1As can be seen from the schematic diagram, the switching device of the present utility model is a circuit breaker and a four-pole circuit breaker in this embodiment, and two poles are short-circuited in pairs to form two poles. Based on this, the switching device further includes a second contact system 4 and a second arc extinguishing unit 5. The second contact system 4 includes a third contact unit 41 and a fourth contact unit 42. The third contact unit 41 and the fourth contact unit 42 are arranged in parallel and separated from each other. The third contact unit 41 is configured with the aforementioned second arc extinguishing unit 5 and the third unit 41 includes a third moving contact 411 and a third static contact 412 that are paired as a contact pair. The fourth contact unit 42 includes a fourth moving contact 421 and a fourth static contact 422 that are paired as a contact pair. When the switching device interrupts the current, the separation of the aforementioned third moving contact 411 from the third static contact 412 lags behind the separation of the aforementioned fourth moving contact 421 from the fourth static contact 422, so that the aforementioned third contact unit 41 serves as the contact unit for interrupting the short-circuit current, and the fourth contact unit 42 serves as the contact unit for non-interrupting the short-circuit current.

[0021] As shown by Figure 1 , the third contact unit 41 and the fourth contact unit 42 are arranged side by side along the first direction D1. More specifically, the first contact unit 11, the second contact unit 12, the fourth contact unit 42, and the third contact unit 41 are arranged side by side along the first direction D1. A third breaking gap S3 is formed between the third moving contact 411 and the third static contact 412 of the third contact unit 41. Similarly, a fourth breaking gap S4 is formed between the fourth moving contact 421 and the fourth static contact 422 of the fourth contact unit 42. And according to the foregoing: when the third breaking gap S3 separates, the short-circuit current is interrupted and the arc of the third breaking gap S3 is extinguished by the second arc extinguishing unit 5. Of course, if it is set that the third moving contact 411 of the third contact unit 41 separates from the corresponding static contact before the fourth moving contact 421 of the fourth contact unit 42, that is, for separating the short-circuit current, it is also feasible that the third moving contact 411 of the third contact unit 41 does not interrupt the short-circuit current.

[0022] In this embodiment, the aforementioned separation from each other is an insulating separation. More specifically, the insulating separation is implemented by an insulating plate provided between the third contact unit 41 and the fourth contact unit 42.

[0023] As mentioned above, the aforementioned first contact system 1 and the aforementioned second contact system 4 correspond to each other left and right, and the first contact system 1 and the second contact system 4 are separated. The aforementioned separation is an insulating separation. Specifically, it is implemented by an insulating separation plate provided between the first contact system 1 and the second contact system 4.

[0024] In summary, the technical solution provided by the present utility model makes up for the deficiencies in the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the technical effect column above.

Claims

1. A switching device, comprising a first contact system (1) and a first arc extinguishing unit (2), the first contact system (1) comprising a first contact unit (11) and a second contact unit (12), characterized in that: The described first contact unit (11) and second contact unit (12) are arranged in parallel and isolated from each other. The first contact unit (11) is configured with a first arc extinguishing unit (2), and the first contact unit (11) includes a first moving contact (111) and a first static contact (112) that are paired as a contact pair with each other. The second contact unit (12) includes a second moving contact (121) and a second static contact (122) that are paired as a contact pair with each other. When the switching device interrupts the current, the separation of the first moving contact (111) from the first static contact (112) lags behind the separation of the second moving contact (121) from the second static contact (122).

2. The switching device according to claim 1, characterized in that: The described isolation from each other is electrical insulation isolation.

3. The switching device according to claim 2, characterized in that: The electrical insulation isolation is implemented by an insulating partition arranged between the first contact unit (11) and the second contact unit (12).

4. A switching device according to claim 1, characterized in that: The switching device further includes a second contact system (4) and a second arc extinguishing unit (5). The second contact system (4) includes a third contact unit (41) and a fourth contact unit (42). The third contact unit (41) and the fourth contact unit (42) are arranged in parallel and separated from each other. The third contact unit (41) is configured with a second arc extinguishing unit (5), and the third contact unit (41) includes a third moving contact (411) and a third static contact (412) that are paired as a contact pair with each other. The fourth contact unit (42) includes a fourth moving contact (421) and a fourth static contact (422) that are paired as a contact pair with each other. When the switching device interrupts the current, the separation of the third moving contact (411) from the third static contact (412) lags behind the separation of the fourth moving contact (421) from the fourth static contact (422).

5. The switching device according to claim 4, characterized in that: The described separation from each other is electrical insulation separation.

6. The switching device according to claim 5, wherein: The electrical insulation separation is implemented by an insulating sheet arranged between the third contact unit (41) and the fourth contact unit (42).

7. A switching device according to claim 4, characterized in that: The described first contact system (1) and the second contact system (4) correspond to each other left and right.

8. A switching device according to claim 7, characterized in that: The first contact system (1) and the second contact system (4) are separated.

9. A switching device according to claim 8, characterized in that: The described separation is electrical insulation separation.

10. A switching device according to claim 9, characterized in that: The electrical insulation separation is implemented by an insulating separation plate arranged between the first contact system (1) and the second contact system (4).

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