DC contactor contact structure with high current breaking capability

Abstract

The present invention discloses a DC contactor contact structure with high current interruption capability. The structure comprises a stationary contact and a movable contact arranged vertically opposite the stationary contact. The stationary contact has a chamfered surface on its lower sidewall, and the movable contact has a stepped surface on its upper side facing the stationary contact. This DC contactor contact structure has minimal effect on the opening distance, significantly improving the DC contactor's arc interruption capability and enhancing product performance.

Description

Technical Field

[0001] The present invention relates to the technical field of DC contactors, and in particular provides a DC contactor contact structure with a large current breaking capability. Background Art

[0002] The contact structure of a DC contactor generally includes a static contact and a moving contact arranged vertically opposite to the static contact, and the bottom of the static contact is a cylindrical structure, and the moving contact is a long flat plate structure. Figures 1-2 When the DC contactor passes current, the arc will start in the middle of the static contact and will follow the attached Figure 2 The arc moves in the direction of the arrow shown, and material transfer occurs during the arc movement. That is, copper ions move with the arc and accumulate at the bottom edge of the static contact. When the material accumulates too much, the distance between the static and moving contacts (this distance is also called the opening distance) decreases, increasing the nearby electric field, which in turn further exacerbates the degree of material accumulation. Moreover, the opening distance is positively correlated with the arc extinguishing ability of the DC contactor. When the opening distance becomes smaller, the DC contactor's ability to interrupt the arc also decreases, affecting the product's arc extinguishing ability.

[0003] In view of this, the present invention is proposed. Summary of the Invention

[0004] In order to overcome the above-mentioned defects, the present invention provides a DC contactor contact structure, which has little effect on the opening distance, can greatly improve the ability of DC contactor products to cut off the arc, and improve product performance.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a DC contactor contact structure with a large current cutting capability, comprising a static contact and a movable contact arranged vertically opposite to the static contact, a chamfered surface being formed on the lower side wall of the static contact, and a stepped surface being formed on the upper side surface of the movable contact facing the static contact.

[0006] As a further improvement of the present invention, the chamfered surface is a cutting surface structure.

[0007] As a further improvement of the present invention, the cutting surface structure is arranged to be inclined from top to bottom, and the cutting surface structure is also smoothly transitioned and connected with the bottom end surface of the static contact.

[0008] As a further improvement of the present invention, the inclination angle of the chamfered surface is 30° to 70°.

[0009] As a further improvement of the present invention, there are two static contacts, and the chamfered surfaces on the two static contacts are arranged opposite to each other.

[0010] As a further improvement of the present invention, the chamfered surface is a circle of downwardly inclined arc surface formed on the bottom side wall of the static contact, and the downwardly inclined arc surface is smoothly transitioned and connected with the bottom end surface of the static contact.

[0011] As a further improvement of the present invention, there are two static contacts, and the chamfered surfaces on the two static contacts are flush with each other.

[0012] As a further improvement of the present invention, the movable contact has a long flat plate-shaped contact body, and two step surfaces are protruded side by side on the upper side of the contact body;

[0013] The downward projections of the bottom end surfaces of the two static contacts fall on the two step surfaces accordingly; correspondingly, the downward projections of the chamfered surfaces on the two static contacts also fall on the two step surfaces accordingly.

[0014] As a further improvement of the present invention, downwardly inclined chamfered surfaces are formed on opposite sides of the two step surfaces.

[0015] The beneficial effects of the present invention are as follows: ① The present invention forms a chamfered surface on the lower side wall of the static contact and a stepped surface on the upper side of the moving contact; when the arc moves, the material will be transferred and accumulated on the chamfered surface and the side of the stepped surface (chamfered slope), thereby providing a "deposition point" for material accumulation and greatly reducing the adverse effect of material accumulation on the opening distance, thereby greatly improving the ability of the DC contactor product to cut off the arc and improving product performance. ② The DC contactor contact structure of the present invention is reasonable and novel, with low production cost, which is conducive to promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the contact structure of a conventional DC contactor;

[0017] Figure 2 Schematic diagram of the cross-sectional structure of a conventional DC contactor contact structure;

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the first embodiment of the contact structure of the DC contactor according to the present invention;

[0019] Figure 4 Schematic diagram of the cross-sectional structure of the first embodiment of the contact structure of the DC contactor according to the present invention;

[0020] Figure 5 This is a schematic diagram of the three-dimensional structure of the second embodiment of the contact structure of the DC contactor according to the present invention;

[0021] Figure 6This is a schematic cross-sectional view of the second embodiment of the contact structure of the DC contactor according to the present invention.

[0022] The following description is made with reference to the accompanying drawings:

[0023] 1—static contact; 10—chamfered surface; 2—moving contact; 20—stepped surface; 200—chamfered inclined surface; 21—contact body. DETAILED DESCRIPTION

[0024] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0025] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0026] The present invention provides a DC contactor contact structure with high current interruption capability, comprising a stationary contact 1 and a moving contact 2 arranged vertically opposite the stationary contact 1. Specifically, a chamfered surface 10 is formed on the lower sidewall of the stationary contact 1, and a stepped surface 20 is formed on the upper side of the moving contact 2 facing the stationary contact 1. By forming the chamfered surface on the lower sidewall of the stationary contact and the stepped surface on the upper sidewall of the moving contact, the present invention ensures that when an arc moves, material will be transferred and accumulated on the chamfered surface and the edges of the stepped surface. This not only provides a "deposit point" for material accumulation, but also greatly reduces the adverse effects of material accumulation on the opening distance, thereby greatly improving the DC contactor's arc interruption capability and enhancing product performance.

[0027] In production applications, there are many specific implementation plans for the DC contactor contact structure of the present invention, which are described in detail as follows:

[0028] Example 1:

[0029] See also Figures 3-4 2 and 3 are schematic diagrams of the three-dimensional structure and the cross-sectional structure of the first embodiment of the contact structure of the DC contactor according to the present invention.

[0030] In this embodiment 1, there are two static contacts 1, and the chamfered surfaces 10 formed on the lower side walls of the two static contacts 1 are both cutting surface structures, and the chamfered surfaces 10 located on the two static contacts 1 are arranged opposite to each other.

[0031] Further preferably, the cutting surface structure is arranged to be inclined from top to bottom, and the cutting surface structure also smoothly transitions to the bottom end surface of the static contact 1. Of course, the transition between the cutting surface structure and the bottom end surface of the static contact 1 can also be designed to be non-smooth, for example, a circle of chamfered arc surface is provided between the cutting surface structure and the bottom end surface of the static contact 1, which can also effectively achieve material transfer and accumulation on the chamfered arc surface and the cutting surface structure.

[0032] More preferably, the inclination angle θ of the chamfered surface 10 is 30° to 70°, and more preferably 55° to 65°.

[0033] In this embodiment 1, the moving contact 2 has a long, flat contact body 21, and two step surfaces 20 are protruded side by side on the upper side of the contact body 21; the downward projection of the bottom end surfaces of the two static contacts 1 falls on the two step surfaces 20, and accordingly, the downward projection of the chamfered surfaces 10 on the two static contacts 1 also falls on the two step surfaces 20.

[0034] Further preferably, the downward projections of the chamfered surfaces 10 on the two static contacts 1 fall on the sides of the two step surfaces 20 , that is, on the chamfered inclined surfaces.

[0035] Further preferably, downwardly inclined chamfered surfaces 200 are formed on opposite sides of the two step surfaces 20, so that the material can be accumulated on the chamfered surfaces 200, thereby reducing the impact on the opening distance.

[0036] Example 2:

[0037] See also Figures 5-6 2 and 3 are schematic diagrams of the three-dimensional structure and the cross-sectional structure of the second embodiment of the contact structure of the DC contactor according to the present invention.

[0038] In the DC contactor contact structure shown in this embodiment 2, the structures of the moving contact 2 and the step surface 20 thereon are the same as those shown in embodiment 1; the main part structure of the static contact 1 is the same as that shown in embodiment 1; only the chamfered surface 10 structure on the static contact 1 is different from the structure shown in embodiment 1.

[0039] In the second embodiment, the chamfered surface 10 is a circle of downwardly inclined arc surface formed on the bottom side wall of the static contact 1 , and the downwardly inclined arc surface smoothly transitions to the bottom end surface of the static contact 1 .

[0040] Further preferably, there are two static contacts 1, and the chamfered surfaces 10 on the two static contacts 1 are flush with each other.

[0041] In summary, the DC contactor contact structure of the present invention is reasonable and novel, has little effect on the opening distance, can greatly improve the ability of the DC contactor product to cut off the arc, and improves the product performance.

[0042] The above description is only a preferred embodiment of the present invention, but is not intended to limit the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A contact structure of a DC contactor with a large current breaking capability, comprising a stationary contact (1) and a movable contact (2) arranged vertically opposite to the stationary contact (1), characterized in that: A chamfered surface (10) is formed on the lower side wall of the static contact (1), and a step surface (20) is formed on the upper side of the movable contact (2) facing the static contact (1), wherein the chamfered surface (10) is a cutting surface structure, and there are two static contacts (1), and the chamfered surfaces (10) on the two static contacts (1) are arranged opposite to each other, and the movable contact (2) has a long flat plate-shaped contact body (21), and two step surfaces (20) are protruded side by side on the upper side of the contact body (21); A downwardly inclined chamfered surface (200) is formed on both sides of the two step surfaces (20) facing each other, and the downward projections of the bottom end surfaces of the two static contacts (1) fall on the two step surfaces (20); correspondingly, the downward projections of the chamfered surfaces (10) on the two static contacts (1) also fall on the two chamfered surfaces (200), and the chamfered surfaces (10) are used for accumulating materials of the static contacts (1), while the chamfered surfaces (200) are used for accumulating materials of the moving contacts (2).

2. The contact structure of a DC contactor with high current breaking capability according to claim 1, characterized in that: The cutting surface structure is arranged to be inclined from top to bottom, and the cutting surface structure is also smoothly transitioned and connected with the bottom end surface of the static contact (1).

3. The contact structure of a DC contactor with high current breaking capability according to claim 2, characterized in that: The inclination angle of the chamfered surface (10) is 30° to 70°.

4. The contact structure of a DC contactor with high current breaking capability according to claim 1, characterized in that: The chamfered surface (10) is a circle of downwardly inclined arc surface formed on the bottom side wall of the static contact (1), and the downwardly inclined arc surface smoothly transitions with the bottom end surface of the static contact (1).

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