Direct current contactor moving contact structure beneficial to arc extinguishing

Abstract

The utility model relates to the technical field of direct current contactors, in particular to a direct current contactor moving contact piece structure beneficial to arc extinguishing, which comprises a guide plate, a magnetic conductive piece, a shaft, a moving iron core, a moving contact piece and a static contact, a gasket is arranged in the central area of the guide plate, and a spring is further arranged on the guide plate; a convex hull is stamped on the area, corresponding to the static contact, of the movable contact piece, the width of the convex hull is smaller than that of the movable contact piece, and falling areas are arranged on the upper side and the lower side of the convex hull and used for lengthening and extinguishing electric arcs; the sectional area of the convex hull is smaller than that of the movable contact piece, so that the possibility of continuous combustion of the convex hull caused by arc contact is reduced; when the convex hull is stamped, falling areas can be formed on the two sides of the convex hull, the lower end of an electric arc is lengthened in the falling areas until the electric arc is extinguished, the arc extinguishing effect is effectively improved, and the electrical life performance of the direct current contactor is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of DC contactors, in particular to a DC contactor moving contact piece structure which is beneficial to arc extinguishing. Background Art

[0002] The moving contact, also known as the moving contact or connecting piece, is a conductive part in the DC contactor. As the moving part in the DC contactor, this part moves upward to contact and conduct with the static contact, thus realizing the conduction of the main circuit of the DC contactor, a switching element.

[0003] See also Figure 1 The moving contact piece currently used in the market is a standard flat plate in the bridge type moving contact. Since an arc will be generated when the moving contact piece and the static contact are separated, in the non-polarity DC contactor products, please refer to Figure 2 The arc is affected by the magnetic blowing magnet and deflected and elongated in the direction shown in the figure. Since the moving contact piece is wider, the arc will continue to burn when it contacts the moving contact piece. The arc can easily burn the internal components of the DC contactor and affect the electrical life of the DC contactor. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a DC contactor moving contact structure that is conducive to arc extinguishing, which is used to solve the problem that the standard flat sheet moving contact in the bridge-type moving contact used in the prior art is not easy to extinguish the arc.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a DC contactor moving contact structure that is conducive to arc extinguishing, including:

[0006] A guide plate, wherein a gasket is disposed in the central area of ​​the guide plate;

[0007] A magnetic conductive sheet, the magnetic conductive sheet is arranged at the lower end of the guide plate;

[0008] A shaft, the shaft movably penetrates the gasket to be movably assembled relative to the guide plate;

[0009] A moving iron core, wherein the moving iron core is sleeved on the shaft below the guide plate;

[0010] A moving contact piece, wherein the moving contact piece is arranged on a shaft body located above the guide plate;

[0011] A static contact, which is arranged above the moving contact piece, and the moving contact piece can detachably contact the static contact to control the on and off of the current;

[0012] A convex bulge is stamped on the area of ​​the moving contact piece corresponding to the contact with the static contact. The width of the convex bulge is smaller than that of the moving contact piece. There are fall-out areas on the upper and lower sides of the convex bulge for lengthening and extinguishing the arc.

[0013] In an embodiment of the present invention, the punching height of the convex bump is half of the thickness of the moving contact piece.

[0014] In an embodiment of the present invention, the width of the empty area is not less than one third of the width of the convex hull.

[0015] In one embodiment of the present invention, a spring is further provided on the guide plate. The spring is sleeved on the outer side of the shaft and the upper end of the spring is connected to the moving contact piece.

[0016] In an embodiment of the present invention, the stamping method of the convex bump includes cold pressing and hot pressing.

[0017] As described above, the DC contactor moving contact structure that is beneficial to arc extinguishing of the utility model has the following beneficial effects:

[0018] Based on the standard flat sheet-like moving contact in the bridge type dynamic contact, the present application punches out a convex bulge on the contact area of ​​the moving contact, the raw materials of the moving contact are easy to obtain, the convex bulge forming method is simple, there is no waste of material as a whole, and the processing cost is reduced; and the cross-sectional area of ​​the convex bulge is smaller than the cross-sectional area of ​​the moving contact, reducing the possibility of the arc contacting the convex bulge and continuing to burn; while stamping the convex bulge, a drop zone will be formed on both sides of the convex bulge, and the lower end of the arc will be elongated in the drop zone until it is extinguished, effectively improving the arc extinguishing effect, greatly reducing the possibility of the arc burning the internal components of the DC contactor, and improving the electrical life performance of the DC contactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the movable contact piece disclosed in the prior art.

[0020] Figure 2 The diagram shows a schematic diagram of a moving contact piece contacting an arc using the prior art.

[0021] Figure 3 It shows a schematic structural diagram of the movable contact piece structure disclosed in the utility model.

[0022] Figure 4 Display as Figure 3 Enlarged structural diagram of the middle moving contact piece.

[0023] Figure 5 Display as Figure 4 Schematic diagram of the cross-sectional structure of the middle moving contact piece.

[0024] Figure 6 It shows a schematic diagram of the moving contact piece contacting an arc disclosed in the utility model.

[0025] Component number description

[0026] Guide plate 1; gasket 2; magnetic conductive sheet 3; shaft 4; moving iron core 5; moving contact piece 6; convex bump 61; drop zone 62; static contact 7; spring 8; arc a. DETAILED DESCRIPTION

[0027] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0028] See also Figures 3 to 6 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 for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportion relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the utility model without affecting the effects and purposes that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0029] See also Figure 3-6The utility model provides a DC contactor moving contact structure that is conducive to arc extinguishing, including a guide plate 1, a magnetic plate 3, a shaft 4, a moving iron core 5, a moving contact 6, and a static contact 7. A gasket 2 is arranged in the central area of ​​the guide plate 1, and a spring 8 is also arranged on the guide plate 1. The role of the spring 8 is very important. The contact's attraction (i.e., the excitation coil is energized, the contact is in contact) and reset (i.e., the excitation coil is de-energized, the contact is disconnected) are affected by the spring. In the normally open state, the spring ensures the disconnection of the contact, and the phenomenon of contact misoperation due to external vibration or inversion will not occur. This is very important to ensure that there will be no accidents caused by misoperation during use; when attracting, the spring can play a buffering role, reducing the shaking of the moving contact caused by the electric repulsion between the moving and static contacts at the moment of attraction, which is very important for reducing the attraction arc a and extending the life of the contactor; when disconnecting (i.e., resetting), the spring force can overcome the electromagnetic force generated by the excitation coil due to power failure, ensuring the rapid disconnection of the contact, and realizing the function of the contactor to disconnect when it should be disconnected. The magnetic conductive sheet 3 is arranged at the lower end of the guide plate 1; the shaft 4 is movably connected in the gasket 2 to be movably assembled relative to the guide plate 1; the moving iron core 5 is sleeved on the shaft 4 located below the guide plate 1, and the moving contact piece 6 is arranged on the shaft 4 located above the guide plate 1. The spring 8 is sleeved on the outside of the shaft 4 and the upper end is connected to the moving contact piece 6; the static contact 7 is arranged above the moving contact piece 6, and the moving contact piece 6 can detachably contact the static contact 7 to control the on and off of the current; when the control circuit applies current to generate a magnetic field, the moving iron core 5 is attracted to move the magnetic conductive sheet 3, so that the moving contact piece 6 contacts and closes with the static contact 7, thereby controlling the conduction of the circuit; when the control circuit is powered off, the magnetic field disappears, the moving contact piece 6 returns to its original position, the circuit is interrupted, and the spring 8 pulls the moving contact piece 6 to reset.

[0030] A convex bump 61 is punched out in the area of ​​the moving contact piece 6 corresponding to the contact with the static contact 7, and the width of the convex bump 61 is smaller than the width of the moving contact piece 6. Specifically, the punching height of the convex bump 61 is half of the thickness of the moving contact piece 6, so that the contact distance between the convex bump 61 and the static contact 7 is limited to a reasonable range; and the cross-sectional area of ​​the convex bump 61 is smaller than the cross-sectional area of ​​the original moving contact piece 6, thereby reducing the possibility that the arc a continues to burn after contacting the convex bump 61; there are dropout areas 62 on the upper and lower sides of the convex bump 61, and specifically, the width of the dropout area 62 is not less than one-third of the width of the convex bump 61, and the lower end of the arc a is elongated in the dropout area 62 until it is extinguished, thereby effectively improving the arc extinguishing effect.

[0031] The stamping methods of the convex bump 61 include cold pressing and hot pressing. Cold pressing is to use pressure to press the material into a shape with required precision at room temperature. Cold pressing has low production cost and short processing cycle. Hot pressing needs to be carried out at high temperature so that the material can be softened and deformed. The material can be processed into a shape with required precision in a short time, and the molding efficiency is high.

[0032] In summary, based on the standard flat sheet-shaped moving contact piece 6 in the bridge-type moving contact, the present application punches out a convex bump 61 on the contact area of ​​the moving contact piece 6. The raw materials of the moving contact piece 6 are easy to obtain, the convex bump 61 is formed in a simple manner, and there is no waste of the material as a whole, thereby reducing the processing cost. The setting of the convex bump 61 can reduce the cross-sectional area and reduce the possibility of the arc a contacting the convex bump 61 and continuing to burn. The drop zone 62 formed on both sides of the convex bump 61 can lengthen and extinguish the arc a, effectively improving the arc extinguishing effect, greatly reducing the possibility of the arc a burning the internal components of the DC contactor, and improving the electrical life performance of the DC contactor. Therefore, the utility model effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0033] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A DC contactor moving contact structure that is conducive to arc extinguishing, comprising: A guide plate (1), wherein a gasket (2) is arranged in the central area of ​​the guide plate (1); A magnetic conductive sheet (3), wherein the magnetic conductive sheet (3) is arranged at the lower end of the guide plate (1); A shaft (4), wherein the shaft (4) is movably inserted into the gasket (2) so as to be movably assembled relative to the guide plate (1); A moving iron core (5), wherein the moving iron core (5) is sleeved on the shaft (4) located below the guide plate (1); A movable contact piece (6), wherein the movable contact piece (6) is arranged on the shaft (4) located above the guide plate (1); A static contact (7), wherein the static contact (7) is arranged above the moving contact piece (6), and the moving contact piece (6) can detachably contact the static contact (7) to control the on-off of the current; The invention is characterized in that a convex bump (61) is stamped on the area of ​​the moving contact piece (6) corresponding to the contact area of ​​the static contact (7); the width of the convex bump (61) is smaller than the width of the moving contact piece (6); and there are fall-off areas (62) on the upper and lower sides of the convex bump (61) for lengthening and extinguishing the arc.

2. The DC contactor moving contact structure that facilitates arc extinguishing according to claim 1 is characterized in that: The stamping height of the convex bump (61) is half the thickness of the moving contact piece (6).

3. The DC contactor moving contact structure that facilitates arc extinguishing according to claim 2 is characterized in that: The width of the drop zone (62) is not less than one third of the width of the convex hull (61).

4. The DC contactor moving contact structure that facilitates arc extinguishing according to claim 1 is characterized in that: The guide plate (1) is also provided with a spring (8), which is sleeved on the outside of the shaft (4) and has an upper end connected to the moving contact piece (6).

5. The DC contactor moving contact structure that facilitates arc extinguishing according to claim 1 is characterized in that: The stamping method of the convex bump (61) includes cold pressing and hot pressing.

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