Direct current contactor

Abstract

The utility model relates to the technical field of contactors, in particular to a direct current contactor which comprises an arc extinguishing shell, a shell cover, a static contact and a moving contact, an arc extinguishing cavity is formed in the arc extinguishing shell, the static contact is fixed to the side wall of the arc extinguishing shell, the shell cover covers the side, away from the static contact, of the arc extinguishing shell, and the moving contact is fixed to the side wall of the arc extinguishing shell. The moving contact is installed on the inner wall of the shell cover, an arc extinguishing cover is fixed to the side wall of the shell cover, the side wall of the arc extinguishing cover abuts against the inner wall of the arc extinguishing shell, an electromagnetic part is arranged on the inner wall of the shell cover, and the electromagnetic part is used for driving the moving contact to slide. According to the invention, a worker does not need to dismount the arc extinguishing cover to work when maintaining the internal parts of the housing, and the efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of contactors, and more particularly to a DC contactor. Background Art

[0002] In the field of electrical engineering, contactors are often used as electromagnetic switches for remotely controlling the on / off of circuits. When the contacts of the contactor are disconnected, an arc will form between the contacts, causing serious damage to the contacts and shortening the service life of the contactor.

[0003] Currently, a DC contactor includes a housing, a static contact, an arc extinguishing cover, and a moving contact. An electromagnet is installed on the inner wall of the housing. The static contact is fixed at one end of the housing, the moving contact is fixed at the end of the electromagnet, the arc extinguishing cover is fixed to the inner wall of the housing near the moving contact by bolts, and the static contact and the moving contact are arranged correspondingly. When using the DC contactor, the electromagnet drives the moving contact to slide towards the static contact. Subsequently, the side wall of the moving contact abuts against the side wall of the static contact. At this time, an arc is generated between the moving contact and the static contact, and the arc is extinguished under the arc extinguishing action of the arc extinguishing cover, and the circuit of the DC contactor is connected.

[0004] When maintaining the internal components of the housing, the above-mentioned workers need to work after removing the arc extinguishing cover, resulting in low efficiency and there is room for improvement. Utility Model Content

[0005] In order to enable workers to work without removing the arc extinguishing cover when maintaining the internal components of the housing and improve efficiency, this application provides a DC contactor.

[0006] A DC contactor provided by this application adopts the following technical solutions:

[0007] A DC contactor includes an arc extinguishing housing, a housing cover, a static contact, and a moving contact. An arc extinguishing chamber is formed inside the arc extinguishing housing. The static contact is fixed to the side wall of the arc extinguishing housing. The housing cover is disposed on the side of the arc extinguishing housing away from the static contact. The moving contact is installed on the inner wall of the housing cover. An arc extinguishing cover is fixed to the side wall of the housing cover, and the side wall of the arc extinguishing cover abuts against the inner wall of the arc extinguishing housing. An electromagnetic component is provided on the inner wall of the housing cover, and the electromagnetic component is used to drive the moving contact to slide.

[0008] By adopting the above technical solutions, when installing the DC contactor, the housing cover is disposed on the side wall of the arc extinguishing housing. At this time, the arc extinguishing cover is located at the opening of the arc extinguishing chamber. Subsequently, the electromagnetic component drives the moving contact to slide on the inner wall of the arc extinguishing chamber towards the static contact. The side wall of the moving contact abuts against the side wall of the static contact. At this time, an arc is generated between the moving contact and the static contact, and the arc is extinguished under the action of the arc extinguishing cover, reducing the influence of the arc on the DC contactor. This setting enables workers to work without removing the arc extinguishing cover when maintaining the internal components of the housing and improves efficiency.

[0009] Optionally, an abutting head is fixed to the end of the static contact, the diameter of the abutting head is smaller than that of the static contact, and the abutting head is located inside the arc extinguishing chamber.

[0010] By adopting the above technical solution, when the DC contactor works, the side wall of the moving contact abuts against the side wall of the abutting head. The arrangement of the abutting head makes the moving contact away from the inner wall of the arc extinguishing housing, increasing the safety during the operation of the DC contactor.

[0011] Optionally, empty slots are formed in the side wall of the arc extinguishing housing, and the empty slots are formed on both sides of the arc extinguishing housing.

[0012] By adopting the above technical solution, the staff can grab the DC contactor through the empty slots, which is convenient for the staff to install the DC contactor.

[0013] Optionally, an air guide pipe is fixed to the side wall of the arc extinguishing housing, the end of the air guide pipe is connected to the inside of the arc extinguishing chamber, and the air guide pipe is located on the inner wall of the empty slot.

[0014] By adopting the above technical solution, when the side wall of the moving contact abuts against the side wall of the abutting head, an arc is generated between the moving contact and the static contact. The air inside the arc extinguishing chamber becomes hot and expands, and the expanded gas flows out through the air guide pipe, making the operation process of the DC contactor stable.

[0015] Optionally, an auxiliary contact is fixed to the side wall of the arc extinguishing housing, and the auxiliary contact is located on the side of the empty slot away from the air guide pipe.

[0016] By adopting the above technical solution, through the auxiliary contact, the DC contactor can expand its control function, enabling the contactor to stably control the on-off of the main circuit.

[0017] Optionally, an isolation slot is formed at one end of the arc extinguishing housing away from the static contact. The isolation slot is located at the opening position of the arc extinguishing chamber, and the side wall of the arc extinguishing cover abuts against the inner wall of the isolation slot.

[0018] By adopting the above technical solution, the arrangement of the isolation slot increases the creepage distance between the arc extinguishing chamber and the auxiliary contact, improving the safety of the DC contactor.

[0019] Optionally, two static contacts are fixed, and insulating ribs are fixed to the side wall of the arc extinguishing housing, and the insulating ribs are respectively close to the two static contacts.

[0020] By adopting the above technical solution, when both of the two static contacts are charged, the arrangement of the insulating ribs increases the creepage distance between the two static contacts, thereby improving the insulation performance.

[0021] Optionally, a closed ring is fixed to the side wall of the arc extinguishing housing, and the side wall of the closed ring abuts against the side wall of the housing cover.

[0022] By adopting the above technical solution, the setting of the closed ring reduces the possibility of external liquid entering the arc extinguishing chamber and increases the service life of the DC contactor.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. When the DC contactor is working, the electromagnetic member drives the moving contact to slide on the inner wall of the arc extinguishing chamber. Subsequently, the side wall of the moving contact abuts against the side wall of the static contact, and the circuit of the DC contactor is connected. At this time, an arc is generated between the moving contact and the static contact. Under the arc extinguishing action of the arc extinguishing cover, the arc is extinguished. When the staff maintains the internal components of the arc extinguishing housing, the staff removes the housing cover, and the housing cover drives the arc extinguishing cover away from the arc extinguishing housing. Subsequently, the arc extinguishing housing is operated. This setting enables the staff to work without removing the arc extinguishing cover when maintaining the internal components of the housing, thus increasing the efficiency.

[0025] 2. The setting of the closed ring reduces the possibility of the gas in the arc extinguishing chamber flowing out of the arc extinguishing chamber. The setting of the air guide pipe provides an outlet for the gas in the arc extinguishing chamber. When an arc is generated between the moving contact and the static contact, the air is heated and expanded, and the expanded gas flows out of the arc extinguishing chamber through the air guide pipe. This setting increases the stability of the DC contactor during operation. Description of the Drawings

[0026] Figure 1 is a schematic diagram of the overall structure of a DC contactor in an embodiment of the present application.

[0027] Figure 2 is a cross-sectional view of a DC contactor in an embodiment of the present application.

[0028] Figure 3 is a schematic diagram of the structure of the arc extinguishing housing in an embodiment of the present application.

[0029] Reference numerals: 1, arc extinguishing housing; 2, housing cover; 3, static contact; 4, moving contact; 5, arc extinguishing chamber; 6, arc extinguishing cover; 7, electromagnetic member; 8, abutting head; 9, empty slot; 10, air guide pipe; 11, auxiliary contact; 12, isolation slot; 13, insulating rib; 14, closed ring. Detailed Embodiment

[0030] The following is a further detailed description of the present application in conjunction with the attached Figures 1-3 drawings.

[0031] An embodiment of the present application discloses a DC contactor.

[0032] Refer to Figure 1, A DC contactor, comprising an arc extinguishing housing 1, a housing cover 2 and a static contact 3. The housing cover 2 is clamped at the end of the arc extinguishing housing 1. The static contact 3 is fixed at one end of the arc extinguishing housing 1 away from the housing cover 2. There are two fixed static contacts 3. An insulating rib 13 is fixed on the side wall of the arc extinguishing housing 1, and the insulating rib 13 is located between the two static contacts 3. A closed ring 14 is fixed at one end of the arc extinguishing housing 1 away from the static contact 3. The setting of the insulating rib 13 increases the creepage distance between the two static contacts 3. Under the action of the closed ring 14, the housing cover 2 is clamped and fixed at one end of the arc extinguishing housing 1 away from the static contact 3. The setting of the closed ring 14 reduces the possibility of external liquid entering the interior of the DC contactor.

[0033] Vacancy slots 9 are provided on both sides of the arc extinguishing housing 1. A gas guide pipe 10 and an auxiliary contact 11 are respectively fixed on both sides of the arc extinguishing housing 1. Both the gas guide pipe 10 and the auxiliary contact 11 are located on the inner wall of the vacancy slot 9. When the DC contactor is working, the internal gas is discharged through the gas guide pipe 10, providing a stable working environment for the DC contactor. The setting of the auxiliary contact 11 provides an expansion space for the DC contactor, facilitating the staff to expand the functions of the DC contactor.

[0034] Refer to Figure 2 , An arc extinguishing chamber 5 is formed inside the arc extinguishing housing 1. A contact head 8 is fixed at the end of the static contact 3. An electromagnetic member 7 is provided on the inner wall of the arc extinguishing housing 1. In the embodiment of the present application, the electromagnetic member 7 is preferably an electromagnet. A moving contact 4 is fixed on the side wall of the electromagnetic member 7. The position of the moving contact 4 corresponds to that of the contact head 8. When the DC contactor is working, the electromagnetic member 7 drives the moving contact 4 to slide towards the contact head 8, and then the side wall of the moving contact 4 abuts against the side wall of the contact head 8, and the circuit of the DC contactor is connected.

[0035] In the present application, a compression spring is fixed at the other end of the static contact 3. The contact head 8 is located inside the arc extinguishing chamber 5, and the compression spring is located at one end of the static contact 3 away from the contact head 8. When the static contact 3 is working, the compression spring provides a supporting force for the static contact 3. Under the supporting action of the compression spring, the process of the side wall of the contact head 8 abutting against the side wall of the moving contact 4 is more stable.

[0036] An arc extinguishing cover 6 is fixed on the side wall of the housing cover 2. The arc extinguishing cover 6 is fixed at one end of the housing cover 2 close to the arc extinguishing housing 1. When installing the DC contactor, the side wall of the arc extinguishing cover 6 abuts against the inner wall of the arc extinguishing housing 1. When the DC contactor is working, the side wall of the moving contact 4 abuts against the side wall of the contact head 8. At this time, an arc is generated between the moving contact 4 and the contact head 8, and then the arc is extinguished under the arc extinguishing action of the arc extinguishing cover 6. The setting of the arc extinguishing cover 6 improves the safety of the DC contactor.

[0037] Refer to Figure 3, one end of the arc extinguishing housing 1 away from the static contact 3 is provided with an isolation groove 12. The setting of the isolation groove 12 increases the distance between the auxiliary contact 11 and the arc extinguishing chamber 5, increases the creepage distance, and improves the safety of the DC contactor; when installing the DC contactor, the side wall of the arc extinguishing cover 6 abuts against the inner wall of the isolation groove 12. This setting makes the arc extinguishing cover 6 cooperate with the isolation groove 12, further improving the safety of the DC contactor.

[0038] The implementation principle of a DC contactor in an embodiment of the present application is as follows: when installing the DC contactor, the staff covers the shell cover 2 on the side wall of the arc extinguishing housing 1. At this time, under the clamping action of the closed ring 14, the shell cover 2 is fixed on the side wall of the arc extinguishing housing 1, and the side wall of the arc extinguishing cover 6 abuts against the inside of the isolation groove 12. When performing maintenance work on the components of the DC contactor, the staff removes the DC contactor. At this time, the shell cover 2 drives the arc extinguishing cover 6 away from the arc extinguishing housing 1. This setting enables the staff to work without removing the arc extinguishing cover 6 when maintaining the internal components of the housing, increasing the efficiency.

[0039] The above are all preferred embodiments of the present application. Without restricting the protection scope of the present application accordingly, therefore: all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A DC contactor, characterized in that: It includes an arc extinguishing housing (1), a housing cover (2), a static contact (3) and a moving contact (4). An arc extinguishing chamber (5) is formed inside the arc extinguishing housing (1). The static contact (3) is fixed to the side wall of the arc extinguishing housing (1). The housing cover (2) is provided on the side of the arc extinguishing housing (1) away from the static contact (3). The moving contact (4) is installed on the inner wall of the housing cover (2). An arc extinguishing cover (6) is fixed to the side wall of the housing cover (2). The side wall of the arc extinguishing cover (6) abuts against the inner wall of the arc extinguishing housing (1). An electromagnetic member (7) is provided on the inner wall of the housing cover (2), and the electromagnetic member (7) is used to drive the moving contact (4) to slide.

2. The DC contactor according to claim 1, characterized in that: An abutting head (8) is fixed to the end of the static contact (3). The diameter of the abutting head (8) is smaller than that of the static contact (3), and the abutting head (8) is located inside the arc extinguishing chamber (5).

3. The DC contactor according to claim 2, wherein: Vacancy grooves (9) are formed in the side wall of the arc extinguishing housing (1), and the vacancy grooves (9) are formed on both sides of the arc extinguishing housing (1).

4. A DC contactor according to claim 3, characterized in that: An air guide pipe (10) is fixed to the side wall of the arc extinguishing housing (1). The end of the air guide pipe (10) communicates with the inside of the arc extinguishing chamber (5), and the air guide pipe (10) is located on the inner wall of the vacancy groove (9).

5. The DC contactor according to claim 4, characterized in that: An auxiliary contact (11) is fixed to the side wall of the arc extinguishing housing (1), and the auxiliary contact (11) is located on the side of the vacancy groove (9) away from the air guide pipe (10).

6. A DC contactor according to claim 5, characterized in that: An isolation groove (12) is formed at one end of the arc extinguishing housing (1) away from the static contact (3). The isolation groove (12) is located at the opening of the arc extinguishing chamber (5), and the side wall of the arc extinguishing cover (6) abuts against the inner wall of the isolation groove (12).

7. A DC contactor according to claim 1, characterized in that: There are two fixed static contacts (3). Insulating ribs (13) are fixed to the side wall of the arc extinguishing housing (1), and the insulating ribs (13) are respectively close to the two static contacts (3).

8. A DC contactor according to claim 1, characterized in that: A sealing ring (14) is fixed to the side wall of the arc extinguishing housing (1), and the side wall of the sealing ring (14) abuts against the side wall of the housing cover (2).

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