Isolation guide sleeve for moving contact of contactor and contactor contact assembly

Abstract

The utility model discloses an isolation guide sleeve for a moving contact of a contactor and a contactor contact assembly, comprising a plastic guide sleeve body which is provided with an isolation member used for preventing carbon deposition caused by ablation of a contact surface where the plastic guide sleeve body is matched with the surface of the moving contact. According to the utility model, the separator is arranged on the plastic guide sleeve body, so that the plastic part of the plastic guide sleeve body is separated from the contact surface of the moving contact, and when the moving contact is excessively heated due to surge, the problem of ablation and carbon deposition on the contact surface of the plastic guide sleeve body and the moving contact can be effectively avoided due to the isolation effect of the separator; therefore, the problem that the carbon deposition part of the guide sleeve generates plastic powder substances due to abrasion in the matching process of the carbon deposition part and the moving contact is solved, the non-conduction probability of the contact part can be effectively reduced, the reduction of the separation distance of the contact part is inhibited, the reliability of the contact part is improved, and the service life of the contactor is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to contactor technical field, concretely relates to a contactor movable contact's isolation guide bush and contactor contact subassembly. BACKGROUND

[0002] The direct current busbar type contactor is applied to on-off and switching control of a heavy load circuit, the contact load part is large in elastic displacement and long in time under impact and vibration due to weight and volume problems, and is prone to shaking under the condition that the spring restraint force is insufficient, the current contact part mainly adopts a plastic integrated isolation guide bush structure to improve the above problems, the plastic isolation guide bush uses lightweight form design, can reduce the weight of the moving part, can effectively reduce the inertia of impact and vibration, and guarantees the stability and reliability of contact performance, but the plastic part has defects of insufficient temperature resistance and powder debris after abrasion, under the conditions of heavy load and high service life, the contact surface of the isolation guide bush and the movable contact is ablated and carbonized due to insufficient long-term temperature resistance, and the plastic powder with extremely low electrical conductivity generated after long-term use of the plastic isolation guide bush will fall on the working surface of the contact subassembly, which will cause the serious consequence that the direct current busbar type contactor cannot conduct the contact load circuit. SUMMARY

[0003] In view of the defects of the prior art, the utility model provides an isolation guide bush for a contactor movable contact, which mainly solves the technical problem that the plastic isolation guide bush in the existing direct current busbar type contactor has the risk of ablation under high temperature and plastic powder generation due to abrasion.

[0004] To achieve the above object, the utility model is realized by the following technical scheme:

[0005] An isolation guide bush for a contactor movable contact, comprising a plastic guide bush body, wherein an isolation piece for preventing carbon deposition on the contact surface of the plastic guide bush body and the movable contact due to ablation is arranged on the plastic guide bush body.

[0006] Further, the isolation piece is an isolation piece structure with high temperature resistance.

[0007] Further, the isolation piece is a metal piece structure or an insulating high-temperature-resistant ceramic piece structure.

[0008] Further, the movable contact comprises a contact seat and a contact ring fixedly installed on the contact seat, and the isolation piece is configured to abut against the surface of the contact seat.

[0009] Further, the isolation piece and the plastic guide bush body are integrally injection molded, or the isolation piece is fixed on the plastic guide bush body through a limiting structure.

[0010] Based on the same inventive concept, the utility model also provides a contactor contact assembly, including transmission rod, two respectively with the two bus bar of contactor is connected static contact and with two static contact opposite setting dynamic contact, the hole of wearing is seted up on dynamic contact, dynamic contact is seted up on transmission rod through the hole of wearing, and the guide bush installation gap is reserved between the inner wall of hole of wearing and the outer wall of transmission rod, the isolation guide bush for the contactor dynamic contact of above any one described is installed on transmission rod, and the isolation piece on the plastic guide bush body abuts on the surface of dynamic contact, and the part below isolation piece of plastic guide bush body is adaptively embedded into the guide bush installation gap between the inner wall of hole of wearing and the outer wall of transmission rod.

[0011] Further, a dynamic contact pad is padded between the bottom of the dynamic contact and the upper end of the overtravel spring, a fitting groove is formed in the bottom of the dynamic contact pad and adapted to the upper end of the overtravel spring, the upper end of the overtravel spring is fitted in the fitting groove, a gasket is padded between the adjusting nut and the lower end of the overtravel spring, an adjusting nut is connected to the lower end of the transmission rod, and the overtravel spring is arranged between the adjusting nut and the dynamic contact.

[0012] Further, the lower end of the plastic guide bush body extends into the dynamic contact pad.

[0013] Further, an inner groove is formed in the bottom of the dynamic contact, a convex part is arranged on the dynamic contact pad and adapted to the inner groove, and the convex part is fitted into the inner groove to form a limiting fit.

[0014] Based on the same inventive concept, the utility model also provides a contactor, which comprises the isolation guide bush for the contactor dynamic contact or the contactor contact assembly.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] In the isolation guide bush for the contactor dynamic contact, the isolation piece is arranged on the plastic guide bush body, so that the plastic part of the plastic guide bush body is isolated from the contact surface of the dynamic contact. When the dynamic contact is subjected to excessive heat due to a surge, the isolation piece can effectively prevent the contact surface of the dynamic contact from being ablated and carbonized, thereby improving the problem that the carbonized part of the guide bush is abraded to generate plastic powder during cooperation with the dynamic contact, effectively reducing the probability of non-conduction of the contact part, inhibiting the reduction of the opening distance of the contact part, and improving the reliability of the contact part and the service life of the contactor. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the structure section view of the contactor contact assembly of the utility model embodiment.

[0018] Figure 2It is the structure explosion map of the contactor contact assembly of the embodiment of the utility model.

[0019] Figure 3 It is the structure schematic diagram of the isolating piece of the embodiment of the utility model.

[0020] Figure 4 It is the whole structure section view of the contactor of the embodiment of the utility model.

[0021] Label explanation:

[0022] 1, plastic guide sleeve body, 2, isolating piece, 3, moving contact, 4, static contact, 5, transmission rod, 6, adjusting nut, 7, overtravel spring, 8, moving contact pad, 9, gasket, 31, contact seat, 32, contact ring, 81, embedded groove, 82, convex part, 311, inner groove. Specific implementation

[0023] The utility model will be further described below in combination with the drawings and embodiments.

[0024] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.

[0025] Please refer to the drawings Figure 1 to the drawings Figure 4 An embodiment of the utility model provides a kind of isolating guide sleeve for contactor moving contact, including plastic guide sleeve body 1, isolating piece 2 for preventing the contact surface of plastic guide sleeve body 1 and moving contact 3 surface cooperation from carbon deposition due to ablation is provided on plastic guide sleeve body 1, plastic guide sleeve body 1 is configured to be contacted with the surface of the moving contact 3 of contactor by isolating piece 2, to prevent plastic guide sleeve body 1 directly contact the surface of moving contact 3.It can be understood that, in the embodiment, by setting isolating piece 2 (i.e. the high-temperature wear resistance of isolating piece 2 is superior to the high-temperature wear resistance of conventional plastic piece) on plastic guide sleeve body 1, the plastic piece part of plastic guide sleeve body 1 is isolated from moving contact surface, when moving contact 3 bears surge and excessive heating, due to the isolation of isolating piece 2, the problem that plastic guide sleeve body 1 and moving contact 3 contact surface produce ablation carbon deposition can be effectively avoided, to improve the problem that the carbon deposition part of guide sleeve produces plastic powder material in the cooperation process with moving contact 3 due to wear, can effectively reduce the probability that contact part is not conducted, and inhibit the reduction of contact part opening distance, improve the reliability of contact part and the service life of contactor.

[0026] Please refer to the attached drawings Figure 1 to the attached drawings Figure 3 In a preferred embodiment, the isolating member 2 is a high-temperature-resistant structure, which can be a metal structure or an insulating high-temperature-resistant ceramic structure. In this embodiment, the metal structure or the insulating high-temperature-resistant ceramic structure can be cooled and restored after being subjected to overheating, effectively ensuring the consistency of the working performance. In addition, when the isolating member 2 has wear-resistant properties, it is not easy to produce powder substances during long-term use, which can effectively reduce the probability of non-conduction of the contact part and inhibit the reduction of the opening distance of the contact part, thereby improving the reliability of the contact part and the service life of the contactor. However, those skilled in the art should understand that in other embodiments, the isolating member 2 can also be made of other materials with high-temperature resistance, and is not limited to the metal structure or the ceramic structure disclosed in the present embodiment. The isolating member 2 and the plastic guide sleeve body 1 are integrally injection molded or the isolating member 2 is fixed on the plastic guide sleeve body 1 by a limiting structure. Specifically, when the isolating member 2 is a metal structure, the isolating member 2 and the plastic guide sleeve body 1 can be processed by a metal insert integrally injection molding process, so that the isolating member 2 is connected and fixed with the plastic guide sleeve body 1. In addition, the isolating member 2 can also be connected and fixed with the plastic guide sleeve body 1 or sleeved on the plastic guide sleeve body 1 by using a clamping or locking member limiting structure.

[0027] Please refer to the attached drawings Figure 1 to the attached drawings Figure 4 In a preferred embodiment, the moving contact 3 includes a contact seat 31 and a contact ring 32 fixedly installed on the contact seat 31, and the isolating member 2 is configured to abut against the surface of the contact seat 31.

[0028] Based on the same inventive concept, the utility model also provides a contactor contact assembly, including transmission rod 5, two respectively with two bus bars of contactor connection static contact 4 and with two static contact 4 opposite arrangement moving contact 3, moving contact 3 is set up on the transmission rod 5 on the sleeve hole, and the transmission rod 5 outer wall between the sleeve hole inner wall and the transmission rod 5 is reserved with guide sleeve installation gap, the transmission rod 5 is set up and installs the isolating guide sleeve of the contactor moving contact of above any one, and the isolating member 2 on the plastic guide sleeve body 1 is abutted on the surface of the moving contact 3, and the part below the isolating member 2 of the plastic guide sleeve body 1 is embedded in the guide sleeve installation gap between the sleeve hole inner wall and the transmission rod 5 outer wall, preferably, the lower end of the plastic guide sleeve body 1 extends to the inside of the moving contact pad 8, and the lower end of the transmission rod 5 is connected with an adjusting nut 6, and an overtravel spring 7 is arranged between the adjusting nut 6 and the moving contact 3.

[0029] Please refer to the attached drawings Figure 1 to the attached drawings Figure 4In one preferable embodiment, a dynamic contact pad 8 is arranged between the bottom of the dynamic contact 3 and the upper end of the over-travel spring 7, and an embedding groove 81 is formed in the bottom of the dynamic contact pad 8 and adapted to the upper end of the over-travel spring 7, the upper end of the over-travel spring 7 is embedded in the embedding groove 81, and a gasket 9 is arranged between the adjusting nut 6 and the lower end of the over-travel spring 7. Preferably, the bottom of the dynamic contact 3 is provided with an inner groove 311, and a convex part 82 is arranged on the dynamic contact pad 8 and adapted to the inner groove 311, the convex part 82 is embedded in the inner groove 311 to form a limit fit.

[0030] Based on the same inventive concept, the utility model also provides a contactor, which comprises the isolation guide sleeve for the contactor dynamic contact or the contactor contact assembly.

[0031] The above description is only used to illustrate the technical scheme of the utility model, and is not limited to the same; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical scheme recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the corresponding technical scheme deviate from the spirit and scope of the technical scheme of the utility model, therefore, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

Claims

1. An isolating guide for a contactor movable contact, characterized by: The plastic guide sleeve body (1) is provided with an isolating piece (2) for preventing the contact surface of the plastic guide sleeve body (1) from being ablated and causing carbon deposition.

2. An isolator bushing for a contactor movable contact as defined in claim 1, characterized in that: The isolating piece (2) is a high-temperature-resistant isolating piece structure.

3. The isolating guide for a contactor movable contact according to claim 1, wherein: The isolating piece (2) is a metal piece structure or a ceramic piece structure.

4. The isolating guide for a contactor movable contact according to claim 1, characterized in that: The moving contact (3) includes a contact seat (31) and a contact ring (32) fixedly installed on the contact seat (31), and the isolating piece (2) is arranged to abut against the surface of the contact seat (31).

5. An isolator bush for a contactor movable contact according to any one of claims 1 to 4, characterized in that: The isolating piece (2) is integrally injection molded with the plastic guide sleeve body (1) or is fixed on the plastic guide sleeve body (1) through a limiting structure.

6. A contactor contact assembly characterized by: The contactor moving contact isolating guide sleeve includes a transmission rod (5), two static contacts (4) connected to two bus bars of the contactor, and a moving contact (3) oppositely arranged with the two static contacts (4). The moving contact (3) is provided with a through sleeve hole, the moving contact (3) is sleeved on the transmission rod (5) through the through sleeve hole, and a guide sleeve installation gap is reserved between the inner wall of the through sleeve hole and the outer wall of the transmission rod (5). The contactor moving contact isolating guide sleeve of any one of claims 1-5 is installed on the transmission rod (5). The isolating piece (2) on the plastic guide sleeve body (1) abuts against the surface of the moving contact (3), and the part of the plastic guide sleeve body (1) below the isolating piece (2) is adaptively embedded into the guide sleeve installation gap between the inner wall of the through sleeve hole and the outer wall of the transmission rod (5).

7. The contactor contact assembly of claim 6, wherein: A moving contact pad (8) is arranged between the bottom of the moving contact (3) and the upper end of the overtravel spring (7), and an embedding groove (81) is arranged in the bottom of the moving contact pad (8) and adapted to the upper end of the overtravel spring (7). The upper end of the overtravel spring (7) is adaptively embedded in the embedding groove (81). A gasket (9) is arranged between the adjusting nut (6) and the lower end of the overtravel spring (7), and an adjusting nut (6) is connected to the lower end of the transmission rod (5). The overtravel spring (7) is arranged between the adjusting nut (6) and the moving contact (3).

8. The contactor contact assembly of claim 7, wherein: The lower end of the plastic guide sleeve body (1) extends to the inside of the moving contact pad (8).

9. The contactor contact assembly of claim 6, wherein: The bottom of the moving contact (3) is provided with an inner groove (311), and the moving contact pad (8) is provided with a convex part (82) adapted to the inner groove (311). The convex part (82) is adaptively embedded into the inner groove (311) to form a limiting fit.

10. A contactor characterized by: The contactor moving contact isolating guide sleeve of any one of claims 1-5 or the contactor contact assembly of any one of claims 6-9 is included.

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