Three-phase alternating current contactor

Abstract

The utility model relates to a three-phase alternating-current contactor, which comprises a bottom plate, an electromagnetic assembly and three groups of contact assemblies, the electromagnetic assembly comprises a coil framework, a yoke, a coil, a static iron core and a movable iron core, each contact assembly comprises a base, a shell, two static contacts, a contact frame and a movable contact, and a linkage rod is arranged on the movable iron core in a linkage manner. The three contact frames of the three contact assemblies are provided with inserting grooves matched with the linkage rod, the linkage rod is inserted into the inserting grooves of the three contact frames in a penetrating mode, linkage matching of the three contact frames and the linkage rod is formed, the linkage rod is provided with a clamping protruding block, the movable iron core is provided with a clamping groove matched with the clamping protruding block, and the movable iron core is provided with a clamping groove matched with the clamping protruding block. And the clamping convex block is clamped in the clamping groove to form clamping fit between the clamping convex block and the movable iron core. The utility model has the advantages of simple structure, stable and reliable performance, and convenient assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, in particular to a three-phase AC contactor. Background Art

[0002] A contactor is an electrical device used in industrial power plants that uses current flowing through a coil to generate a magnetic field, closing contacts to control the load. A contactor consists of an electromagnetic system (armature, stator, and electromagnetic coil), a contact system (normally open and normally closed contacts), and an arc extinguishing device. The principle of an electromagnetic contactor is that when the electromagnetic coil of the contactor is energized, it generates a strong magnetic field, causing the stator to generate an electromagnetic attraction that attracts the armature and drives the contacts: the normally closed contact opens and the normally open contact closes, and the two are linked. When the coil is de-energized, the electromagnetic attraction disappears, and the armature is released by the release spring, causing the contacts to return to their normal state: the normally closed contact closes and the normally open contact opens.

[0003] Currently, the three-phase AC contactors used in specialized AC equipment in railways, oil fields, mines, and other locations are simply modified versions of consumer electrical appliances. These are bulky and have a high failure rate, failing to meet the high-density, high-capacity, and high-vibration requirements of these special applications. Their complex structural design precludes modular assembly and is complex to repair, resulting in high maintenance costs. Furthermore, these three-phase AC contactors have a small contact opening, resulting in poor arc extinguishing performance. Summary of the Invention

[0004] The purpose of the utility model is to overcome the defects of the prior art and provide a three-phase AC contactor with a simple structure, stable and reliable performance, and convenient assembly.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts a three-phase AC contactor, including a base plate, an electromagnetic assembly arranged on the base plate, and three groups of contact assemblies coordinated with the electromagnetic assembly. The electromagnetic assembly includes a coil skeleton arranged on the base plate, a yoke arranged on the coil skeleton, a coil arranged on the coil skeleton, a static iron core arranged in the coil skeleton, a movable iron core arranged on the coil skeleton and coordinated with the static iron core, and the contact assembly includes a base arranged on the yoke, a shell arranged on the base, two static contacts arranged in the base, a sliding A contact frame is arranged in the base, and a moving contact is linked to the contact frame and cooperates with the two static contacts. A linkage rod is linked to the moving iron core. The three contact frames of the three groups of contact assemblies are provided with slots that cooperate with the linkage rod. The linkage rod is inserted into the slots of the three contact frames and constitutes a linkage cooperation between the three contact frames and the linkage rod. A snap-fitting protrusion is provided on the linkage rod. A snap-fitting groove that cooperates with the snap-fitting protrusion is provided on the moving iron core. The snap-fitting protrusion is engaged in the snap-fitting groove and constitutes a snap-fitting cooperation between the snap-fitting protrusion and the moving iron core.

[0006] The beneficial effects of the above structure are as follows: the three contact frames of the three contact assemblies are connected via a linkage rod, thereby achieving modularization of the three contact assemblies and ensuring better synchronization of the movements of the three contact frames of the three contact assemblies. Moreover, the linkage rod engages with the movable iron core of the electromagnetic assembly via a snap-on protrusion, thereby achieving modular assembly of the electromagnetic assembly and the three contact assemblies, thereby improving assembly efficiency. As a result, the three-phase AC contactor has the advantages of simple structure, stable and reliable performance, and convenient assembly.

[0007] In particular, the base plate is provided with auxiliary contacts that cooperate with the contact frame. The auxiliary contacts include a base body provided on the base plate, a cover provided on the base body, a slider slidably provided in the base body, a return spring provided between the slider and the base body, two auxiliary moving contacts respectively provided on the slider, two compression springs provided between the slider and the two auxiliary moving contacts, four auxiliary static contacts respectively provided in the base body and cooperating with the two auxiliary moving contacts, and four terminal blocks provided on one end of the four auxiliary static contacts. The contact frame has a drive block extending outside the base. The drive block moves with the contact frame and contacts the slider, thereby forming a linkage between the slider and the contact frame. The auxiliary head adopts a modular structural design, which facilitates the assembly of the auxiliary contact and the base plate. The contact frame drives the slider of the auxiliary contact through the drive block, thereby ensuring that the contact frame can reliably trigger the auxiliary contact, thereby facilitating the working reliability of the three-phase AC contactor.

[0008] Specifically, the auxiliary moving contact comprises a support plate and two auxiliary contact pieces arranged parallel to the support plate. Each of the two auxiliary contact pieces has two curved raised contact portions at each end that mate with the auxiliary static contact. The auxiliary moving contact utilizes a modular design, facilitating assembly of the auxiliary moving contact and the slider. Furthermore, the auxiliary moving contact utilizes a dual-contact structure, resulting in a wider opening distance and greater safety.

[0009] In particular, the movable contact has two bent contact portions at both ends, each of which is provided with two movable contacts. The two stationary contacts have two stationary contact portions at one end that bend and extend toward the two bent contact portions, each of which is provided with a stationary contact that mates with the two movable contacts. The housing is provided with an arc extinguishing chamber that covers the two bent contact portions and the two stationary contact portions. The arc extinguishing chamber is provided above the two bent contact portions of the movable contact and the stationary contact portions of the two stationary contacts, thereby ensuring that the arc can quickly enter the arc extinguishing chamber, thereby improving the arc extinguishing performance of the three-phase AC contactor.

[0010] Specifically, the arc extinguishing chamber includes a housing mounted on a casing and a plurality of arc extinguishing grids disposed within the housing. The housing includes an arc striking plate, one end of which is bent and extends toward the static contact portion. The housing also includes an arc striking plate having a U-shaped arc striking portion extending toward the two bent contact portions. The arc striking plate can quickly direct the arc at the contact portion of the moving contact into the arc extinguishing chamber, while the arc striking plate can quickly direct the arc at the static contact into the arc extinguishing chamber, thereby improving the arc extinguishing performance of the three-phase AC contactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a three-dimensional diagram of an embodiment of the present utility model.

[0012] Figure 2 This is an exploded view of an embodiment of the present utility model.

[0013] Figure 3 This is a cross-sectional view of an embodiment of the present invention.

[0014] Figure 4 This is a diagram of the internal structure of an embodiment of the present utility model.

[0015] Figure 5 This is a three-dimensional diagram of the auxiliary moving contact according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0016] like Figures 1 to 5 As shown, the embodiment of the present invention is a three-phase AC contactor, including a base plate 10, an electromagnetic assembly 20 arranged on the base plate 10, and three groups of contact assemblies 30 that cooperate with the electromagnetic assembly 20. The electromagnetic assembly 20 includes a coil skeleton 21 arranged on the base plate 21, a yoke 22 arranged on the coil skeleton 21, a coil 23 arranged on the coil skeleton 21, a static iron core 24 arranged in the coil skeleton 21, and a movable iron core 25 movably arranged on the coil skeleton 21 and cooperating with the static iron core 24. The contact assembly 30 includes a base 31 arranged on the yoke 22, a shell 32 arranged on the base 31, two static contacts 33 arranged in the base 31, and a sliding contact 33 arranged in the base 31. The movable contact 35 is linked to the contact frame 34 and matched with the two static contacts 33. The movable iron core 25 is linked with a linkage rod 36. The three contact frames 34 of the three groups of contact assemblies 30 are provided with slots 341 that match the linkage rod 36. The linkage rod 36 is inserted into the slots 341 of the three contact frames 34 and constitutes a linkage cooperation between the three contact frames 34 and the linkage rod 36. The linkage rod 36 is provided with a snap-fitting protrusion 361. The movable iron core 25 is provided with a snap-fitting groove 251 that matches the snap-fitting protrusion 361. The snap-fitting protrusion 361 is engaged in the snap-fitting groove 251 and constitutes a snap-fitting cooperation between the snap-fitting protrusion 361 and the movable iron core 25.

[0017] like Figure 2 、 3 As shown in Figure 5, the base plate 10 is provided with an auxiliary contact 40 that cooperates with the contact frame 34. The auxiliary contact 40 includes a base body 41 provided on the base plate 10, a cover plate 42 provided on the base body 41, a slider 43 slidably provided in the base body 41, a return spring 44 provided between the slider 43 and the base body 41, two auxiliary moving contacts 45 respectively provided on the slider 43, two compression springs 46 provided between the slider 43 and the two auxiliary moving contacts 45, four auxiliary static contacts 47 respectively provided in the base body 41 and cooperating with the two auxiliary moving contacts 25, and four wiring terminals 48 provided on one end of the four auxiliary static contacts 47. The contact frame 34 has a driving block 342 extending outside the base 31. The driving block 342 moves with the contact frame 34 and abuts against the slider 43, and constitutes a linkage cooperation between the slider 43 and the contact frame 34. The auxiliary head adopts a modular structural design, which facilitates the assembly of the auxiliary contact and the base plate. The contact frame drives the auxiliary contact slider through the drive block, ensuring that the contact frame can reliably trigger the auxiliary contact, thereby improving the operating reliability of the three-phase AC contactor. The auxiliary moving contact 45 includes a support plate 451 and two auxiliary contact pieces 452 arranged parallel to the support plate 451. The two auxiliary contact pieces 452 have two arc-shaped raised contact portions 453 at both ends that mate with the auxiliary static contact 47. The auxiliary moving contact adopts a modular structural design, which facilitates the assembly of the auxiliary moving contact and the slider. The auxiliary moving contact adopts a dual-contact structure design, which has a larger opening distance and higher safety.

[0018] like Figure 4As shown, the movable contact 35 has two bent contact portions 351 at both ends, and two movable contacts 352 are provided on the two bent contact portions 351. The two static contacts 33 have two static contact portions 331 at one end that bend and extend toward the two bent contact portions 351. The two static contact portions 331 are respectively provided with static contacts 332 that cooperate with the two movable contacts 352. The housing 32 is provided with an arc extinguishing chamber 50 that covers the two bent contact portions 351 and the two static contact portions 331. The arc extinguishing chamber is provided above the two bent contact portions of the movable contact and the static contact portions of the two static contacts, thereby ensuring that the arc can quickly enter the arc extinguishing chamber, thereby facilitating improved arc extinguishing performance of the three-phase AC contactor. The arc extinguishing chamber 50 includes a cover 51 disposed on the housing 32 and a plurality of arc extinguishing grids 52 disposed within the cover 51. An arc striking plate 53 is disposed within the cover 51, one end of which is bent and extends toward the static contact portion 331. An arc striking piece 54 is disposed within the cover 51, and the arc striking piece 54 has a U-shaped arc striking portion 541 extending toward the two bent contact portions 351. The arc striking piece can quickly introduce the arc at the contact portion of the moving contact into the arc extinguishing chamber, and the arc striking plate can quickly introduce the arc at the static contact into the arc extinguishing chamber, thereby improving the arc extinguishing performance of the three-phase AC contactor.

[0019] The three contact frames of the three contact assemblies are connected via a linkage rod, thereby achieving modularization of the three contact assemblies and ensuring better synchronization of the movements of the three contact frames of the three contact assemblies. Furthermore, the linkage rod engages with the movable iron core of the electromagnetic assembly via a snap-on bump, thereby enabling modular assembly of the electromagnetic assembly and the three contact assemblies, resulting in higher assembly efficiency. Consequently, the three-phase AC contactor has the advantages of simple structure, stable and reliable performance, and convenient assembly.

Claims

1. A three-phase AC contactor comprising a base plate, an electromagnetic assembly disposed on the base plate, and three sets of contact assemblies cooperating with the electromagnetic assembly, wherein the electromagnetic assembly comprises a coil bobbin disposed on the base plate, a yoke disposed on the coil bobbin, a coil disposed on the coil bobbin, a stationary iron core disposed within the coil bobbin, and a movable iron core movably disposed on the coil bobbin and cooperating with the stationary iron core, characterized in that: The contact assembly includes a base arranged on a yoke, a shell arranged on the base, two static contacts arranged in the base, a contact frame slidably arranged in the base, and a moving contact linked to the contact frame and matched with the two static contacts. A linkage rod is linked to the moving iron core, and the three contact frames of the three groups of contact assemblies are provided with slots matched with the linkage rods. The linkage rods are inserted into the slots of the three contact frames and constitute a linkage match between the three contact frames and the linkage rods. A snap-fit ​​protrusion is provided on the linkage rod, and a snap-fit ​​groove matched with the snap-fit ​​protrusion is provided on the moving iron core. The snap-fit ​​protrusion is engaged in the snap-fit ​​groove and constitutes a snap-fit ​​match between the snap-fit ​​protrusion and the moving iron core.

2. The three-phase AC contactor according to claim 1, characterized in that: The base plate is provided with an auxiliary contact that cooperates with the contact frame. The auxiliary contact includes a base body provided on the base plate, a cover plate provided on the base body, a slider slidably provided in the base body, a reset spring provided between the slider and the base body, two auxiliary moving contacts respectively provided on the slider, two compression springs provided between the slider and the two auxiliary moving contacts, four auxiliary static contacts respectively provided in the base body and cooperating with the two auxiliary moving contacts, and four connecting terminals provided on one end of the four auxiliary static contacts. The contact frame has a driving block extending outside the base, and the driving block moves with the contact frame and abuts against the slider, thereby constituting a linkage cooperation between the slider and the contact frame.

3. The three-phase AC contactor according to claim 2, characterized in that: The auxiliary moving contact comprises a support plate and two auxiliary contact pieces arranged in parallel on the support plate. Both ends of the two auxiliary contact pieces are provided with two arc-surface raised contact portions that match the auxiliary static contact.

4. The three-phase AC contactor according to claim 1 or 2, characterized in that: The moving contact has two bent contact parts at both ends, and two moving contacts are provided on the two bent contact parts. One end of the two static contacts has two static contact parts that are bent and extended toward the two bent contact parts, and the two static contact parts are respectively provided with static contacts that cooperate with the two moving contacts. The shell is provided with an arc extinguishing chamber covering the two bent contact parts and the two static contact parts.

5. The three-phase AC contactor according to claim 4, characterized in that: The arc extinguishing chamber includes a cover body arranged on the shell and a plurality of arc extinguishing grids arranged in the cover body. An arc striking plate is arranged in the cover body, and one end of the arc striking plate is bent and extended toward the static contact part. An arc striking piece is arranged in the cover body, and the arc striking piece has a U-shaped arc striking portion extending toward the two bent contact portions.

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