DC contactor

Abstract

The direct current contactor comprises a contact system and an electromagnetic mechanism, the contact system comprises a moving contact, a moving contact support, a static contact, a static contact shell and an arc extinguishing cover, a reset baffle is arranged on the moving contact support, and blocking parts are formed at the two ends of the reset baffle and extend out of the moving contact support. A spring is arranged between the middle portion of the reset baffle and the moving contact support, the static contact shell forms two stopping blocks below the stopping portion of the reset baffle, a permanent magnet is arranged below the arc extinguishing cover and embedded in the static contact shell, magnet yokes are arranged on the two sides of the static contact shell and connected with the permanent magnet, and the magnet yokes are connected with the arc extinguishing cover. According to the utility model, the contact system adopts a bridge type double-breakpoint structure, the double breakpoints can ensure enough opening distance under the condition of small stroke, the enough opening distance ensures the arc dividing capability, the damage to the contact is extremely small, the service life is ensured, the reset spring is arranged in the moving contact bracket, the volume is further reduced, and the structure is small and exquisite.

Description

Technical Field

[0001] This utility model relates to a DC contactor, and more particularly to a DC contactor for railway locomotives. Background Technology

[0002] Currently, electrical components in diesel locomotives, Harmony locomotives, substations, and other high-current industrial control applications frequently experience burnout. Analyzing the causes, there are two main reasons: one is design flaws in the contactor itself, including poor arc extinguishing capability, unreasonable design of the actuating and contact mechanisms, and excessively small opening distances; the other is that due to installation location limitations, some smaller capacity electrical components are overused, resulting in insufficient safety margins. Utility Model Content

[0003] To address the aforementioned shortcomings, this utility model provides a DC contactor with a large opening distance and small size.

[0004] To achieve the above objectives, this utility model employs a DC contactor, including a contact system and an electromagnetic mechanism. The contact system includes a moving contact, a moving contact support, a stationary contact, a stationary contact housing, and an arc-extinguishing shroud. The contact system comprises two sets of moving contacts, stationary contacts, and arc-extinguishing shrouds. The middle portions of the two sets of moving contacts are respectively positioned on both sides of the moving contact support. Moving contacts are provided at both ends of the moving contacts. The stationary contacts are located below the sides of the moving contacts, with stationary contacts corresponding to the moving contacts located at their inner ends. The arc-extinguishing shrouds are located outside the moving and stationary contacts. Stationary contacts are provided outside both sets of stationary contacts and the arc-extinguishing shrouds. The head shell and the stationary contact shell have an arc-venting port at the rear of the arc-extinguishing shroud. The electromagnetic mechanism is linked to the moving contact support and controls the sliding of the moving contact support between the two stationary contact shells. The moving contact support is provided with a reset baffle. The two ends of the reset baffle form blocking parts and extend out of the moving contact support. A spring is provided between the middle of the reset baffle and the moving contact support. The stationary contact shell has two blocking blocks below the blocking parts of the reset baffle. A permanent magnet is provided below the arc-extinguishing shroud and is embedded in the stationary contact shell. Magnetic yokes are provided on both sides of the stationary contact shell and are connected to the permanent magnets.

[0005] Preferably, the magnetic yoke is disposed on the outside of the stationary contact housing.

[0006] Preferably, the outer end of the moving contact is provided with an upper arc-guiding plate extending towards the upper end of the arc-extinguishing shroud, and the top end of the stationary contact is provided with a lower arc-guiding plate extending towards the lower end of the arc-extinguishing shroud.

[0007] Preferably, the stationary contact housing includes a side plate and a cover plate. The side plates are respectively disposed on both sides of each group of stationary contacts. The cover plate covers the side plates of the two stationary contact housings. The cover plate is provided with a column and is fixedly connected to the electromagnetic mechanism. The center of the cover plate is connected to the upper end of the moving contact bracket.

[0008] Preferably, an outwardly extending arc-damping plate is provided between the two stationary contact housings.

[0009] Preferably, two microswitches are provided above the cover plate, and the upper end of the moving contact bracket forms a triangular top rod. The top rod moves upward to trigger the microswitches and moves downward to close the microswitches.

[0010] The contact system in this invention adopts a bridge-type double-break structure. The double break ensures sufficient opening distance even with a short stroke, guaranteeing its arc-splitting capability and minimizing damage to the contacts, thus extending its service life. The return spring is built into the moving contact bracket, further reducing its size and making the structure compact, approximately half the size of a contactor of the same capacity. Permanent magnet arc extinguishing is used, and the yoke is located outside the housing, saving internal space and facilitating installation. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a specific embodiment of the present utility model.

[0012] Figure 2 This is a schematic diagram of a specific embodiment of the present invention with one side plate removed.

[0013] Figure 3 This is a front view of a specific embodiment of the present invention with one side panel removed.

[0014] Figure 4 This is a cross-sectional view of a specific embodiment of the present utility model. Detailed Implementation

[0015] like Figures 1-4As shown, a specific embodiment of this utility model is a DC contactor, including a contact system and an electromagnetic mechanism 9. The contact system includes a moving contact 1, a moving contact support 2, a stationary contact 3, a stationary contact housing 4, and an arc-extinguishing shroud 5. Two sets of moving contacts 1, stationary contacts 3, and arc-extinguishing shrouds 5 are arranged in the contact system. The middle portions of the two sets of moving contacts 1 are respectively arranged on both sides of the moving contact support 2. Moving contacts 11 are provided at both ends of the moving contacts 1. The stationary contacts 3 are located below both sides of the moving contacts 1. Stationary contacts 3 have stationary contacts 31 corresponding to the moving contacts 11 at their inner ends. The arc-extinguishing shroud 5 is located outside the moving contacts 1 and stationary contacts 3. An upper arc-guiding plate 12 extending towards the upper end of the arc-extinguishing shroud 5 is provided at the outer end of the moving contacts 1. A lower arc-guiding plate 32 extending towards the lower end of the arc-extinguishing shroud 5 is provided at the top of the stationary contacts 3. A stationary contact housing 4 is provided outside both sets of stationary contacts 3 and the arc-extinguishing shroud 5. The stationary contact housing 4 is located outside the arc-extinguishing shroud 5. An arc-extinguishing port 44 is provided at the rear. The moving iron core 91 of the electromagnetic mechanism 9 is linked to the moving contact support 2 and controls the moving contact support 2 to slide between the two stationary contact housings 4. A reset baffle 21 is provided on the moving contact support 2. The two ends of the reset baffle 21 form blocking parts 22 and extend out of the moving contact support 2. A reset spring 23 is provided between the middle of the reset baffle 21 and the moving contact support 2. Two blocking blocks 45 are formed below the blocking parts 22 of the reset baffle 21 on the stationary contact housing 4. The blocking blocks 45 can block the blocking parts 22 of the reset baffle 21, causing the reset baffle 21 to move upward and compress the reset spring 23, thus accumulating restoring force for the moving contact 1. A permanent magnet 6 is provided below the arc-extinguishing cover 5. The permanent magnet 6 is embedded in the stationary contact housing 4. Magnetic yokes 61 are provided on both sides of the stationary contact housing 4. The magnetic yokes 61 are located on the outside of the stationary contact housing 4 and are connected to the permanent magnet 6. An outwardly extending arc-damping plate 8 is provided between the two stationary contact housings 4.

[0016] The stationary contact housing 4 includes side plates 42 and a cover plate 41. The side plates 42 are respectively disposed on both sides of each group of stationary contacts 3. The cover plate 41 covers the side plates 42 of the two stationary contact housings 4. A column 43 is provided on the cover plate 41 and is fixedly connected to the electromagnetic mechanism 9. The center of the cover plate 41 is connected to the upper end of the moving contact bracket 2. Two microswitches 7 are disposed above the cover plate 41. The upper end of the moving contact bracket 2 forms a triangular push rod 24. The push rod 24 moves upward to trigger the microswitches 7 and moves downward to close the microswitches 7.

[0017] The preferred embodiments of the present invention described above are examples of the present invention. Other obvious variations or combinations are also within the scope of protection of the claims.

Claims

1. A DC contactor, comprising a contact system and an electromagnetic mechanism, wherein the contact system includes a moving contact, a moving contact support, a stationary contact, a stationary contact housing, and an arc-extinguishing shroud; the contact system comprises two sets of moving contacts, stationary contacts, and arc-extinguishing shrouds; the middle portions of the two sets of moving contacts are respectively disposed on both sides of the moving contact support; both ends of the moving contacts are provided with moving contacts; the stationary contacts are disposed below both sides of the moving contacts; the inner ends of the stationary contacts are provided with stationary contacts corresponding to the moving contacts; the arc-extinguishing shrouds are disposed outside the moving contacts and stationary contacts; both sets of stationary contacts and the arc-extinguishing shrouds are provided with stationary contact housings; the stationary contact housings have arc-venting ports opened behind the arc-extinguishing shrouds; the electromagnetic mechanism is linked to the moving contact support and controls the sliding of the moving contact support between the two stationary contact housings, characterized in that: A reset baffle is provided on the moving contact support. The two ends of the reset baffle form blocking parts and extend out of the moving contact support. A spring is provided between the middle of the reset baffle and the moving contact support. Two blocking blocks are formed below the blocking parts of the reset baffle on the stationary contact housing. A permanent magnet is provided below the arc extinguishing cover. The permanent magnet is embedded in the stationary contact housing. Magnetic yokes are provided on both sides of the stationary contact housing and are connected to the permanent magnets.

2. The DC contactor according to claim 1, characterized in that: The magnetic yoke is located on the outside of the stationary contact housing.

3. The DC contactor according to claim 1 or 2, characterized in that: The moving contact has an upper arc-guiding plate extending towards the upper end of the arc-extinguishing shroud at its outer end, and the stationary contact has a lower arc-guiding plate extending towards the lower end of the arc-extinguishing shroud at its top end.

4. The DC contactor according to claim 3, characterized in that: The stationary contact housing includes a side plate and a cover plate. The side plates are respectively arranged on both sides of each group of stationary contacts. The cover plate covers the side plates of the two stationary contact housings. The cover plate is provided with a column and is fixedly connected to the electromagnetic mechanism. The center of the cover plate is connected to the upper end of the moving contact support.

5. The DC contactor according to claim 1 or 2, characterized in that: An outwardly extending baffle plate is provided between the two stationary contact housings.

6. The DC contactor according to claim 4, characterized in that: Two microswitches are installed above the cover plate, and the upper end of the moving contact bracket forms a triangular top rod.

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