Alternating current contactor

Abstract

The utility model belongs to the field of alternating current contactors, and particularly relates to an alternating current contactor, which comprises a shell, an electromagnetic system, a contact frame, a movable contact bridge, a contact spring and a static contact, the contact frame is provided with a mounting hole for the movable contact bridge to pass through, and two guide bumps are arranged on two sides, corresponding to the middle of the movable contact bridge, in the mounting hole. Two sides of the contact spring are provided with two guide projections, two sides of the movable contact bridge are provided with four guide sheets which are distributed on two sides of the two guide projections, and the four guide sheets move along with the movable contact bridge and slide on two sides of the two guide projections in a reciprocating manner, so that the four guide sheets of the movable contact bridge can be driven by elastic force of the contact spring to slide along two sides of the two guide projections in a reciprocating manner. Stable and reliable contact between the moving contact bridge and the static contact can be ensured, the contact reliability is higher, and the service life of the contact can be prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of AC contactors, and in particular relates to an AC contactor. Background Art

[0002] AC contactor is an automatic switching device, mainly used to connect or disconnect the main circuit of the motor or load. It uses electromagnetic force to control the closing or disconnection of the switch, which is suitable for frequent operation and remote control of high-voltage circuits, and has the protection performance of low-voltage release. The working principle of AC contactor is to use electromagnetic force and spring elastic force to realize the connection and disconnection of contacts. When the coil is energized, the electromagnetic force generated attracts the iron core, closing the contacts and connecting the circuit; when the coil is de-energized, the electromagnetic force disappears, the spring resets the contacts, and the circuit is disconnected.

[0003] The contact frame structure design of the existing AC contactor is unreasonable. When opening and closing, the elastic force of the contact spring drives the moving contact bridge to move in the mounting hole of the contact frame, and the moving contact bridge cannot move smoothly and reliably in the mounting hole of the contact frame, resulting in unstable contact between the moving contact bridge and the static contact, increased contact resistance, and increased contact surface temperature. In severe cases, the contact will overheat, melt, or even burn, and even damage the equipment. In addition, the pressing part of the contact frame of the AC contactor is exposed outside the shell, and pollutants such as powder and dust can easily enter the inside of the contactor from the pressing part of the contact frame, greatly affecting the service life of the product. Summary of the invention

[0004] The purpose of the utility model is to provide an AC contactor in order to overcome the shortcomings and deficiencies of the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: an AC contactor, including a shell, an electromagnetic system, a contact frame cooperating with the electromagnetic system, a moving contact bridge linked to the contact frame, a contact spring arranged between the moving contact bridge and the contact frame, and a static contact, the contact frame is provided with a mounting hole for the moving contact bridge to pass through, two guide protrusions are arranged on both sides of the mounting hole corresponding to the middle of the moving contact bridge, the moving contact bridge has four guide pieces distributed on both sides of the two guide protrusions on both sides, the four guide pieces move with the moving contact bridge and slide back and forth on both sides of the two guide protrusions.

[0006] In some embodiments, the two guide protrusions have two guide inclined surfaces on both sides that match the four guide pieces, and the inclination directions and inclination angles of the guide inclined surfaces of the guide protrusions are the same.

[0007] In some embodiments, the four guide plates have arc-surface protrusions that match the guide slopes, and the arc-surface protrusions move with the guide plates and slide back and forth on the guide slopes.

[0008] In some embodiments, the four guiding pieces are formed by bending, and the four guiding pieces and the moving contact bridge are of an integral structure.

[0009] In some embodiments, a positioning convex block cooperating with the contact spring is arranged in the mounting hole, a positioning boss cooperating with the contact spring is arranged on the moving contact bridge, and two ends of the contact spring are respectively clamped on the positioning convex block and the positioning boss.

[0010] In some embodiments, a dust-proof cover is further included, which is arranged on the housing and covers the pressing part of the contact holder, and a dust-proof groove for accommodating the pressing part is arranged in the dust-proof cover.

[0011] In some embodiments, a clamping block cooperating with the dust-proof cover is arranged on the housing, a clamping convex strip cooperating with the clamping block is arranged in the dust-proof groove, a clamping groove cooperating with the clamping convex strip is arranged on the clamping block, and the clamping convex strip is clamped in the clamping groove, and a clamping fit between the clamping convex strip and the housing is formed.

[0012] In some embodiments, an arc-shaped convex part abutting in the clamping groove is arranged on the clamping convex strip.

[0013] The beneficial effects of the utility model are as follows:

[0014] 1. Two guiding convex blocks cooperating with the moving contact bridge are arranged on the contact holder. During closing and opening, the elastic force of the contact spring drives the four guiding pieces of the moving contact bridge to reciprocally slide along both sides of the two guiding convex blocks. The contact holder adopts a multi-point guiding structure design, which can ensure the stable and reliable contact between the moving contact bridge and the static contact, with higher contact reliability, and is beneficial to extending the service life of the contact.

[0015] 2. A guiding inclined surface cooperating with the guiding piece is arranged on the guiding convex block, so that a sliding friction contact between the moving contact bridge and the static contact can be realized, the oxide layer, carbide or pollutants on the contact surface can be effectively scraped off, the purpose of self-cleaning of the contact is realized, the increase of the contact resistance caused by oxidation or dirt is avoided, the heat generation and energy loss are reduced, the contact between the moving contact bridge and the static contact is ensured to be more reliable, and it is beneficial to extending the service life of the contact.

[0016] 3. A dust-proof cover covering the pressing part of the contact holder is arranged on the housing. The dust-proof cover can prevent pollutants such as powder and dust from entering the contactor from the pressing part of the contact holder, which is beneficial to extending the service life of the product. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, obtaining other accompanying drawings based on these drawings still belongs to the scope of the present invention.

[0018] Figure 1 Stereogram of the embodiment of the present invention;

[0019] Figure 2 Cross-sectional view of the embodiment of the present invention;

[0020] Figure 3 Exploded view of the embodiment of the present invention;

[0021] Figure 4 Stereogram of the moving contact bridge of the embodiment of the present invention;

[0022] Figure 5 Stereogram of the dust cover of the embodiment of the present invention. Detailed implementation manners

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the following further details the present invention in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and do not limit the present invention. The terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above accompanying drawing descriptions are intended to cover non-exclusive inclusion.

[0025] The directional and positional terms mentioned in the present invention, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only with reference to the directions or positions in the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding the present invention and do not limit the protection scope of the present invention.

[0026] Now, the present invention will be further described in conjunction with the accompanying drawings and specific implementation manners:

[0027] Such as Figures 1 to 4As shown, an AC contactor includes a housing 10, an electromagnetic system 11, a contact frame 12 linked with the electromagnetic system 11, a moving contact bridge 13 linked to the contact frame 12, a contact spring 14 arranged between the moving contact bridge 13 and the contact frame 12, and a static contact 15. The contact frame 12 is provided with a mounting hole 121 for the moving contact bridge 13 to pass through, and two guide protrusions 122 are arranged on both sides of the mounting hole 121 corresponding to the middle of the moving contact bridge 13. The moving contact bridge 13 has four guide pieces 131 distributed on both sides of the two guide protrusions 122 on both sides. The four guide pieces 131 move with the moving contact bridge 13 and slide back and forth on both sides of the two guide protrusions 122. Two guide protrusions are provided on the contact frame to match the moving contact bridge. When opening and closing the switch, the elastic force of the contact spring drives the four guide pieces of the moving contact bridge to slide back and forth along the two guide protrusions. The contact frame adopts a multi-point guide structure design to ensure that the moving contact bridge and the static contact are in stable and reliable contact, and the contact reliability is higher, which is conducive to extending the service life of the contact. Two guide bevels 123 are provided on both sides of the two guide protrusions 122 to match the four guide pieces 131, and the inclination direction and inclination angle of the guide bevels 123 of the guide protrusions 122 are the same. The guide protrusions are provided with guide bevels that match the guide pieces, so that the moving contact bridge and the static contact can be in sliding friction contact, and the oxide layer, carbide or contaminants on the surface of the contact can be effectively scraped off to achieve the purpose of self-cleaning of the contact, avoid the increase of contact resistance due to oxidation or dirt, reduce heat and energy loss, ensure that the contact between the moving contact bridge and the static contact is more reliable, and is conducive to extending the service life of the contact.

[0028] like Figure 4 As shown, the four guide pieces 131 have arc-surface protrusions 132 that match the guide slope 123, and the arc-surface protrusions move with the guide pieces and slide back and forth on the guide slopes. The four guide pieces 131 are formed by bending, and the four guide pieces 131 and the moving contact bridge 131 are an integrated structure. The four guide pieces match the guide protrusions through the arc-surface protrusions, which can ensure that the four guide pieces can reliably move on the guide slopes of the guide protrusions, which is conducive to improving the stability of the movement of the moving contact bridge, and the four guide pieces and the moving contact bridge adopt an integrated structural design, which is conducive to reducing production costs.

[0029] like Figure 2 and 4 As shown, a positioning protrusion 124 matching with the contact spring 14 is provided in the mounting hole 121, and a positioning boss 133 matching with the contact spring 14 is provided on the moving contact bridge 13, and both ends of the contact spring 14 are respectively engaged with the positioning protrusion 124 and the positioning boss 133. The contact spring is engaged with the positioning boss of the moving contact bridge and the positioning protrusion of the contact frame, thereby ensuring that the elastic force of the contact spring can reliably act on the moving contact bridge.

[0030] like Figure 1 , 3As shown in FIGS. 5, a dust cover 16 covering the pressing portion 125 of the contact holder 12 is provided on the housing 10, and a dust-proof groove 161 for accommodating the pressing portion 125 is provided in the dust cover 16. A dust cover covering the pressing portion of the contact holder is provided on the housing. The dust cover can prevent pollutants such as powder and dust from entering the contactor from the pressing portion of the contact holder, which is beneficial to extending the service life of the product. A clamping block 101 cooperating with the dust cover 16 is provided on the housing 10. A clamping rib 162 cooperating with the clamping block 101 is provided in the dust-proof groove 161. A clamping groove 102 cooperating with the clamping rib 162 is provided on the clamping block 101. The clamping rib 162 is engaged in the clamping groove 102, and the clamping rib 162 and the housing 10 are clamped and matched. The dust cover and the housing are connected by a clamping fit, which is convenient for the assembly of the dust cover and the housing, and the assembly efficiency is higher. An arc-shaped convex portion 163 abutting in the clamping groove 102 is provided on the clamping rib 162. The arc-shaped convex portion abuts in the clamping groove, which can ensure that the connection between the dust cover and the housing is more compact. When subjected to vibration, the dust cover and the housing will not loosen or fall off.

[0031] The above is only one embodiment of the present invention and is not used to limit the protection scope of the present invention; the protection scope of the present invention is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the present invention are within the protection scope of the present invention patent.

Claims

1. An AC contactor, comprising a housing, an electromagnetic system, a contact frame coordinated with the electromagnetic system, a movable contact bridge arranged in the contact frame, a contact spring arranged between the movable contact bridge and the contact frame, and a stationary contact, characterized in that: The contact frame is provided with a mounting hole for the moving contact bridge to pass through, and two guide protrusions are arranged on both sides of the mounting hole corresponding to the middle of the moving contact bridge. The moving contact bridge has four guide pieces distributed on both sides of the two guide protrusions. The four guide pieces move with the moving contact bridge and slide back and forth on both sides of the two guide protrusions.

2. The AC contactor according to claim 1, characterized in that: The two guide protrusions are provided with two guide inclined surfaces on both sides thereof which match the four guide pieces, and the inclined directions and inclined angles of the guide inclined surfaces of the guide protrusions are the same.

3. The AC contactor according to claim 2, characterized in that: The four guide pieces are provided with arc-surface protrusions matched with the guide inclined surfaces. The arc-surface protrusions move with the guide pieces and slide back and forth on the guide inclined surfaces.

4. The AC contactor according to claim 3, characterized in that: The four guide pieces are formed by bending, and the four guide pieces and the moving contact bridge are an integrated structure.

5. The AC contactor according to claim 1, characterized in that: A positioning convex block matched with the contact spring is arranged in the installation hole, a positioning boss matched with the contact spring is arranged on the moving contact bridge, and two ends of the contact spring are respectively engaged with the positioning convex block and the positioning boss.

6. The AC contactor according to claim 1, characterized in that: It also includes a dust cover which is arranged on the housing and covers the pressing portion of the contact frame, wherein the dust cover has a dustproof groove for accommodating the pressing portion.

7. The AC contactor according to claim 6, characterized in that: The shell is provided with a snap-in block that matches the dust cover, the dustproof groove is provided with a snap-in convex strip that matches the snap-in block, the snap-in block is provided with a snap-in groove that matches the snap-in convex strip, the snap-in convex strip is snapped into the snap-in groove, and constitutes a snap-in fit between the snap-in convex strip and the shell.

8. The AC contactor according to claim 7, characterized in that: The clamping convex strip is provided with an arc-surface protrusion which abuts against the clamping groove.

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