AC contactor

Abstract

The utility model relates to related switch equipment in the electrical field, in particular to an alternating current contactor. An alternating current contactor comprises an insulating substrate, a strip-shaped through groove is formed in the middle of the insulating substrate, a movable plate is movably matched in the strip-shaped through groove, a movable contact plate is arranged on the movable plate, static contact plates are arranged on the two sides of the movable plate, upward protruding static contacts are arranged on the static contact plates, and wiring holes are further formed in the static contact plates. The static contact plate comprises a connecting part and a static contact part, the connecting part comprises a first connecting part section and a second connecting part section, the first connecting part section is fixed with the insulating substrate, the static contact part is provided with the static contact and is detachably fixed on the upper side of the first connecting part section, and the second connecting part section is provided with the wiring hole. According to the utility model, only local replacement of the static contact plate is needed, wire disconnection and rewiring are not needed, the maintenance cost is low, the convenience of replacement of the static contact is improved, and the labor intensity of maintenance workers can be reduced.

Description

Technical Field

[0001] This utility model relates to related switching equipment in the electrical field, specifically to an AC contactor. Background Technology

[0002] Chinese Patent Application No. 202021572604.0 discloses an AC contactor, which includes a substrate and a contact support. A longitudinal through groove is formed in the middle of the substrate, and stationary contact plates are installed on both sides of the longitudinal through groove. The contact support includes a movable contact plate and a moving contact assembly elastically connected to the movable contact plate. A silver-plated stationary contact is provided at one end of the stationary contact plate near the longitudinal through groove. A wiring hole is provided at the position of the stationary contact plate away from the stationary contact. The circuit is turned on and off by making the moving contact of the moving contact assembly of the contact support contact with the stationary contact to disconnect.

[0003] After prolonged use, the surface of the stationary contact will be damaged after repeated impacts of the moving contact with the silver-plated stationary contact. Small pits or melting points will form on the surface, and the silver will also be oxidized at high temperatures, forming substances such as silver oxide on the contact surface. These oxides will increase the contact resistance of the contact and will not be easily removed during subsequent contact, thus affecting the normal conductivity of the contact. In severe cases, it may cause the contactor to fail to disconnect or connect the circuit properly.

[0004] Therefore, the stationary contact plates of the AC contactor need to be replaced regularly. Since there are many stationary contact plates in the AC contactor, and each stationary contact plate is connected to multiple wires, the replacement of the stationary contact plates is very troublesome. In addition, since the entire AC contactor is heavy (up to several hundred kilograms) and the stationary contact plates are thick copper plates, the labor intensity of maintenance workers is relatively high. Utility Model Content

[0005] The purpose of this invention is to provide an AC contactor that facilitates the replacement of stationary contacts and reduces the labor intensity of maintenance workers.

[0006] To achieve the above objectives, this utility model employs an AC contactor, comprising an insulating substrate, a strip-shaped through groove in the middle of the insulating substrate, a movable plate movably fitted within the strip-shaped through groove, a plurality of movable contact plates arranged side by side on the movable plate, stationary contact plates supported on the insulating substrate on both sides of the movable plate, a stationary contact protruding upward on the side of the stationary contact plate near the movable plate, and a wiring hole on the stationary contact plate, the movable contact plate having a movable contact located directly above the stationary contact, the stationary contact plate comprising a connecting portion and a stationary contact portion, the connecting portion comprising a connecting portion section near the movable plate and a connecting portion section two located on the side of the connecting portion, the connecting portion section one fixed to the insulating substrate, the stationary contact portion having the stationary contact and detachably fixed to the upper side of the connecting portion section one, and the connecting portion section two having the wiring hole.

[0007] When the stationary contact needs to be replaced, only the stationary contact part needs to be removed from the connection part of the stationary contact plate. It is not necessary to remove the entire stationary contact plate. Therefore, the wires electrically connected to the stationary contact plate do not need to be disconnected and rewired, nor is it necessary to replace the entire heavy stationary contact plate. The maintenance cost is low, and it is convenient to replace the stationary contact. It makes it easier for maintenance workers to replace the stationary contact and reduces the labor intensity of maintenance workers.

[0008] Preferably, the stationary contact corresponds one-to-one with the moving contact, and each stationary contact portion is provided with at least two stationary contacts arranged side by side. The silver-plated stationary contacts at the ends of the stationary contact portions do not need to be connected together; gaps can be left in the portions not in contact with the moving contact, ensuring a one-to-one correspondence between the stationary and moving contacts. This avoids excessive redundant design and reduces production and maintenance costs. Furthermore, multiple stationary contacts can distribute current more evenly, preventing individual stationary contacts from bearing excessive current loads, thereby reducing temperature rise, delaying aging, reducing the risk of damage due to overheating, and extending the service life of the stationary contacts.

[0009] Preferably, the insulating substrate has an upwardly extending portion near the strip-shaped through groove, with a portion of the stationary contact supported on the extension and another portion supported on a section of the connecting portion. By providing partial support through the extension, the stationary contact does not need to rely entirely on the connecting portion for support, which allows for a significant reduction in the size of the connecting portion, thereby reducing the amount of copper used.

[0010] Preferably, a first fixing hole is provided between the connecting portion and the insulating substrate, and a second fixing hole is provided between the connecting portion and the stationary contact portion. The first fixing hole and the second fixing hole are not coaxial. That is, the stationary contact portion, the connecting portion, and the insulating substrate are not fixed together by a single fastener, and disassembling the stationary contact portion does not affect the fixation of the connecting portion and the insulating substrate.

[0011] Preferably, the second fixing hole is located between the two first fixing holes, and the second fixing hole and the first fixing hole are not arranged side by side. Since the stationary contact plate is large, multiple fasteners are used for connection and fixation. The above-mentioned design can ensure the structural strength of the stationary contact part and the connecting part.

[0012] Preferably, the moving contact is electrically connected to the power module, which includes a rectifier circuit with two parallel short-circuit switches. This parallel short-circuit switch design creates redundancy; when one short-circuit switch is closed, the other can serve as a backup, ensuring normal circuit operation and preventing coil winding burnout. Furthermore, the two short-circuit switches facilitate maintenance by repair personnel.

[0013] This invention only requires partial replacement of the stationary contact plate, without disconnecting the wires or rewiring, and has the advantages of lower maintenance costs, improved convenience of stationary contact replacement, and reduced labor intensity for maintenance workers. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a structure in Example 1.

[0015] Figure 2 This is a schematic diagram of the static contact plate of Example 1.

[0016] Figure 3 This is a schematic diagram of another structure of the static contact plate in Example 1.

[0017] Figure 4 This is a cross-sectional view of Example 1.

[0018] Figure 5 This is a schematic diagram of the structure of the guide component in Embodiment 1.

[0019] Figure 6 This is a cross-sectional view of Example 2. Detailed Implementation

[0020] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0021] Example 1

[0022] Depend on Figures 1 to 5 As shown, this embodiment discloses an AC contactor, including an insulating substrate 1. The insulating substrate 1 has a strip-shaped through groove in the middle, and a movable plate 2 is movably fitted in the strip-shaped through groove. Several movable contact plates 21 are arranged side by side on the movable plate 2, and stationary contact plates 3 supported on the insulating substrate 1 are provided on both sides of the movable plate 2.

[0023] The stationary contact plate 3 includes a connecting portion 31 and a stationary contact portion 32. The connecting portion 31 includes a first connecting portion 311 near the movable plate 2 and a second connecting portion 312 located to the side of the connecting portion 31. The first connecting portion 311 is fixed to the insulating substrate 1. The stationary contact portion 32 has a stationary contact 39 and is detachably fixed to the upper side of the first connecting portion 311. The second connecting portion 312 has a wiring hole 30. The moving contact plate 21 has a moving contact located directly above the stationary contact 39. The structure and fixing method of the moving contact plate 21 in this embodiment can adopt the structure and fixing method of any existing AC contactor. The stationary contact 39 corresponds one-to-one with the moving contact, and each stationary contact portion has three stationary contacts 39 arranged side by side. Each stationary contact plate 3 corresponds to three moving contact plates 21.

[0024] Depend on Figure 2 and Figure 3As shown, a first fixing hole 3111 is provided between the connecting part 311 and the insulating substrate 1, and the first fixing hole 3111 is arranged in two rows and two columns. A second fixing hole 3112 is provided between the connecting part 311 and the stationary contact part 32, and the second fixing hole 3112 is arranged in two rows and three columns. The first fixing hole 3111 and the second fixing hole 3112 are not coaxial and are offset from each other. The second fixing hole 3112 is located between the two first fixing holes 3111 and the second fixing hole 3112 are not arranged side by side.

[0025] In this embodiment, the moving contact is electrically connected to the power module, which includes a rectifier circuit. The wiring method and power module of this embodiment can adopt any existing AC contactor wiring method and power module. The rectifier circuit of this embodiment is provided with two parallel short-circuit switches 4.

[0026] Among them, by Figure 1 and Figure 5 As shown, two sets of cooperating guide assemblies 100 are provided between the insulating substrate 1 and the movable plate 2. Each guide assembly 100 includes a slider 12 and a slide rail 13. One component of the slider 12 and slide rail 13 is fixed to the insulating substrate 1, and the other component is fixed to the movable plate. This embodiment includes three sets of moving contact plates 21 and three sets of stationary contact plates 3. A guide assembly is provided between adjacent moving and stationary contact plates to improve the stability of the movable plate 2 during vertical movement. In this embodiment, the slider 12 is fixed to the insulating substrate 1. The insulating substrate 1 has a through groove that intersects perpendicularly with the strip-shaped through groove, penetrating the insulating substrate 1 vertically. The guide rail 13 is located within the through groove. The movable plate 2 has two upwardly extending vertical plates 20. Each vertical plate 20 has one of these guide assemblies 100 on one side. To further improve stability, each wire assembly includes a vertically extending slide rail 13 located on the front and rear sides of the vertical plate 20, with each slide rail 13 cooperating with a slider 12.

[0027] Example 2

[0028] Depend on Figure 6 As shown, the difference between this embodiment and the previous embodiment is only that: the insulating substrate 1 has an upwardly extending extension 11 near the strip through groove, a part of the stationary contact 32 is supported on the extension 11, and the other part of the stationary contact 32 is supported and detachably fixed on a section 311 of the connecting part.

[0029] In this utility model solution, only the stationary contact part of the stationary contact plate needs to be replaced locally, without disconnecting the wires and rewiring. It has the advantages of lower maintenance costs, improved convenience of stationary contact replacement, and reduced labor intensity of maintenance workers.

Claims

1. An AC contactor, comprising an insulating substrate, wherein a strip-shaped through groove is provided in the middle of the insulating substrate, a movable plate is movably fitted within the strip-shaped through groove, a plurality of movable contact plates are arranged side by side on the movable plate, stationary contact plates supported on the insulating substrate are provided on both sides of the movable plate, a stationary contact protruding upward is provided on the side of the stationary contact plate near the movable plate, a wiring hole is also provided on the stationary contact plate, and the movable contact plate has a movable contact located directly above the stationary contact, characterized in that: The stationary contact plate includes a connecting part and a stationary contact part. The connecting part includes a first connecting part near the movable plate and a second connecting part located on the side of the connecting part. The first connecting part is fixed to the insulating substrate. The stationary contact part has the stationary contact head and is detachably fixed to the upper side of the first connecting part. The second connecting part has the wiring hole.

2. The AC contactor according to claim 1, characterized in that: The stationary contact and the moving contact are in one-to-one correspondence, and each stationary contact portion is provided with at least two stationary contacts arranged side by side.

3. The AC contactor according to claim 1 or 2, characterized in that: The insulating substrate has an upwardly extending portion near the strip-shaped through groove, a portion of the stationary contact portion is supported on the extension portion, and another portion of the stationary contact portion is supported on a section of the connecting portion.

4. The AC contactor according to claim 1 or 2, characterized in that: A first fixing hole is provided between the connecting part and the insulating substrate, and a second fixing hole is provided between the connecting part and the stationary contact part. The first fixing hole and the second fixing hole are not coaxial.

5. The AC contactor according to claim 4, characterized in that: The first fixing hole is located between the two second fixing holes, and the first fixing hole and the second fixing hole are not arranged side by side.

6. The AC contactor according to claim 1 or 2, characterized in that: The moving contact is electrically connected to the power module, which includes a rectifier circuit and two parallel short-circuit switches.

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