Single-phase alternating current contactor

Abstract

The utility model relates to a single-phase alternating current contactor, which comprises a shell, an electromagnetic driving mechanism, a contact system, two microswitches and an arc extinguishing system, the electromagnetic driving mechanism comprises a yoke iron frame, a coil framework, a coil, a static iron core and a movable iron core, and the contact system comprises a contact frame, a movable contact bridge, a contact spring, two static contacts and two permanent magnets. A contact frame is arranged in the shell, a positioning plate is arranged at the position, corresponding to the contact frame, in the shell, a reset spring is arranged between the positioning plate and the contact frame, two poke rods extending out of the shell are arranged on the two sides of the contact frame, the two poke rods act along with the contact frame and abut against buttons of the two microswitches, and connection or disconnection of the two microswitches is achieved. The arc extinguishing device has the advantages of simple structure, stable and reliable performance, large contact opening distance, small contact resistance and good arc extinguishing effect.

Description

Technical Field

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

[0002] Contactors are divided into AC contactors (voltage AC) and DC contactors (voltage DC), which are used in power, power distribution and power consumption. In a broad sense, contactors refer to electrical appliances in industrial electricity that use current flowing through a coil to generate a magnetic field to close the contacts to control the load. At present, the two-phase AC contactors used in special AC equipment in railway locomotives, oil fields, mines and other occasions are slightly modified on the basis of civil AC contactors. They are large in size and have a high failure rate. They cannot meet the high-density, large-capacity, and strong vibration requirements of special occasions such as railways, oil fields, and mines. At the same time, maintenance is complicated, so the maintenance cost is high. The existing single-phase AC contactor has a relatively complex structural design, the contact frame cannot reliably trigger the micro switch, and the contact opening distance of the single-phase AC contactor is small, the contact pressure is small, the contact resistance is large, and the arc extinguishing effect is poor. Summary of the invention

[0003] The utility model aims to overcome the defects of the prior art and provide a single-phase AC contactor with simple structure, stable and reliable performance, large contact opening distance, small contact resistance and good arc extinguishing effect.

[0004] To achieve the above-mentioned purpose, the utility model adopts a single-phase AC contactor, including a shell, an electromagnetic drive mechanism, a contact system, two micro switches respectively arranged on both sides of the shell, and an arc extinguishing system. The electromagnetic drive mechanism includes a yoke frame, a coil frame arranged in the yoke frame, a coil arranged on the coil frame, a static iron core arranged in the coil frame, and a moving iron core movably arranged in the coil frame and matched with the static iron core. The contact system includes a contact frame that is linked with the moving iron core, a moving contact bridge linked to the contact frame, a contact spring arranged between the moving contact bridge and the contact frame, two static contacts symmetrically arranged in the shell and matched with the moving contact bridge, and two permanent magnets arranged in the shell at the corresponding positions of the two static contacts. A positioning plate is arranged at the corresponding contact frame in the shell, and a reset spring is arranged between the positioning plate and the contact frame. Two toggle rods extending outside the shell are provided on both sides of the contact frame. The two toggle rods move with the contact frame and abut against the buttons of the two micro switches to realize the connection or disconnection of the two micro switches.

[0005] The beneficial effects of the above structure are: the moving contact bridge adopts a double-contact structure design, and the contact opening distance is large, the contact pressure is large, so the contact resistance is small, the contact will not heat up when a large current passes through it, and the contact temperature rise is small when a large current passes through it. The contact spring and the reset spring can accelerate the opening and closing speed of the contact frame, and the contact is quickly disconnected. At the same time, the permanent magnet arc extinguishing method is adopted, and the arc extinguishing effect is good, which reduces the damage to the main contact caused by arcing when the contactor is disconnected, and prolongs the service life of the contact. The contact frame triggers two micro switches through the toggle rod, and the working reliability is higher. Therefore, the single-phase AC contactor has the advantages of simple structure, stable and reliable performance, large contact opening distance, small contact resistance, and good arc extinguishing effect.

[0006] In particular, the arc extinguishing system includes two groups of arc extinguishing grids, two lower arc-starting plates, and an upper arc-starting plate, which are respectively arranged in the housing between the two stationary contacts and the moving contact bridge. One end of the two lower arc-starting plates extends in the two groups of arc extinguishing grids, and the other end of the two lower arc-starting plates extends between the permanent magnet and the stationary contact. Both ends of the upper arc-starting plate extend in the two groups of arc extinguishing grids, and the upper arc-starting plate has two arc-starting protrusions at the two ends of the moving contact bridge. The two upper arc-starting plates can quickly introduce the arc at the stationary contact into the arc extinguishing grid group, and the upper arc-starting plate can quickly introduce the arc at the moving contact bridge into the arc extinguishing grid group, which is conducive to the rapid extinguishing of the arc, reduces the damage to the main contact caused by arcing when the contactor is disconnected, and prolongs the service life of the contact.

[0007] In particular, the housing is provided with magnetic conductive sheets connected to both ends of the permanent magnet, one end of which extends to the arc extinguishing grid group. The magnetic conductive sheets can play a magnetic conductive role, so that the arc quickly enters the arc extinguishing grid group, and the arc extinguishing effect is stronger.

[0008] In particular, the arc-extinguishing grid group includes a plurality of arc-extinguishing grids arranged at intervals in the housing, one end of the plurality of arc-extinguishing grids has an arc-extinguishing groove, and an arc-extinguishing channel matching the motion trajectory of the moving contact bridge is formed between the arc-extinguishing grooves of the plurality of arc-extinguishing grids. The arc-extinguishing grid group is provided with an arc-extinguishing channel matching the moving contact bridge, which is conducive to the rapid extinguishing of the arc and has a better arc-extinguishing effect.

[0009] In particular, a guide hole is provided on the contact frame corresponding to the positioning plate, and the positioning plate is inserted into the guide hole to form a sliding connection between the contact frame and the positioning plate. The positioning plate can guide the contact frame, which can ensure that the contact frame can move reliably, thereby facilitating the improvement of the working reliability of the AC contactor.

[0010] Specifically, a driving block is arranged between the contact holder and the moving iron core. A clamping rib is arranged on one side of the driving block, and a clamping groove matching with the clamping rib is arranged on the moving iron core. The clamping rib is clamped in the clamping groove, forming a linkage cooperation between the driving block and the contact holder. A clamping block is arranged on the other side of the driving block, and a clamping slot matching with the clamping block is arranged on the contact holder. The clamping block is clamped in the clamping slot, forming a linkage cooperation between the contact holder and the driving block. The contact holder and the moving iron core are connected through the driving block, and the driving block is connected with the contact holder and the moving iron core by a clamping cooperation method, which is convenient for the assembly of the contact holder, the moving iron core and the driving block, and has higher assembly efficiency. Description of the Drawings

[0011] Figure 1 It is a perspective view of an embodiment of the present utility model.

[0012] Figure 2 It is a sectional view of an embodiment of the present utility model.

[0013] Figure 3 It is an internal structure diagram of an embodiment of the present utility model. Detailed Embodiment

[0014] As Figures 1 to 3 shown, an embodiment of the present utility model is a single-phase AC contactor, which includes a housing 10, an electromagnetic driving mechanism 20, a contact system 30, two micro switches 11 respectively arranged on both sides of the housing 10, and an arc extinguishing system 40. The electromagnetic driving mechanism 20 includes a yoke iron frame 21, a coil skeleton 22 arranged in the yoke iron frame 21, a coil 23 arranged on the coil skeleton 22, a static iron core 24 arranged in the coil skeleton 22, and a moving iron core 25 movably arranged in the coil skeleton 22 and cooperating with the static iron core 24. The contact system 30 includes a contact holder 31 linked and cooperating with the moving iron core 25, a moving contact bridge 32 linked and arranged on the contact holder 31, a contact spring 33 arranged between the moving contact bridge 32 and the contact holder 31, two static contacts 34 symmetrically arranged in the housing 10 and cooperating with the moving contact bridge 32, and two permanent magnets 35 arranged in the housing 10 corresponding to the two static contacts 34. A positioning plate 36 is arranged in the housing 10 corresponding to the contact holder 31, a return spring 37 is arranged between the positioning plate 36 and the contact holder 31, two toggle rods 311 extending outside the housing 10 are arranged on both sides of the contact holder 31, and the two toggle rods 311 move with the contact holder 31 and abut against the buttons 111 of the two micro switches 11, realizing the connection or disconnection of the two micro switches 11.

[0015] As Figure 2 and 3As shown, the arc extinguishing system 40 includes two sets of arc extinguishing grid groups 41, two lower arc leading pieces 42, and an upper arc leading piece 43 respectively disposed in the housing corresponding to the positions between the two static contacts 34 and the moving contact bridge 32. One end of each of the two lower arc leading pieces 42 extends into the two sets of arc extinguishing grid groups 41 respectively, and the other end of each of the two lower arc leading pieces 42 extends between the permanent magnet 35 and the static contact 34. Both ends of the upper arc leading piece 43 extend into the two sets of arc extinguishing grid groups 41 respectively, and the upper arc leading piece 43 has two arc leading protrusions 431 corresponding to both ends of the moving contact bridge 32. The two upper arc leading pieces can quickly introduce the arc at the static contact into the arc extinguishing grid group, and the upper arc leading piece can quickly introduce the arc at the moving contact bridge into the arc extinguishing grid group, which is beneficial to the rapid extinguishing of the arc, reduces the damage to the main contact caused by arcing during the breaking of the contactor, and extends the service life of the contact. The housing 10 is respectively provided with magnetic conductive sheets 38 connected to both ends of the permanent magnet 35, and one end of the magnetic conductive sheet 38 extends to the position of the arc extinguishing grid group 41. The magnetic conductive sheet can play a role in guiding magnetism, so that the arc can quickly enter the arc extinguishing grid group, and the arc extinguishing effect is stronger. The arc extinguishing grid group 41 includes a plurality of arc extinguishing grids 411 arranged at intervals in the housing 10. One end of each of the plurality of arc extinguishing grids 411 has an arc extinguishing groove 4111, and an arc extinguishing channel 410 matching the movement track of the moving contact bridge 32 is formed between the arc extinguishing grooves 4111 of the plurality of arc extinguishing grids 411. The arc extinguishing grid group is provided with an arc extinguishing channel matching the moving contact bridge, which is beneficial to the rapid extinguishing of the arc and has a better arc extinguishing effect. A guiding hole 312 is provided on the contact holder 31 corresponding to the positioning plate 36. The positioning plate 36 is inserted into the guiding hole 312, and a sliding connection and cooperation between the contact holder 31 and the positioning plate 36 are formed. The positioning plate can play a guiding role for the contact holder, and can ensure that the contact holder can act reliably, which is beneficial to improving the working reliability of the AC contactor. A driving block 39 is arranged between the contact holder 31 and the moving iron core 24. A clamping convex strip 391 is arranged on one side of the driving block 39, and a clamping groove 241 matching the clamping convex strip 391 is arranged on the moving iron core 24. The clamping convex strip 391 is clamped in the clamping groove 241, and a linkage cooperation between the driving block 39 and the contact holder 31 is formed. A clamping block 392 is arranged on the other side of the driving block 39, and a clamping groove 313 matching the clamping block 392 is arranged on the contact holder 31. The clamping block 392 is clamped in the clamping groove 313, and a linkage cooperation between the contact holder 31 and the driving block 39 is formed. The contact holder and the moving iron core are connected by the driving block, and the driving block is connected to the contact holder and the moving iron core by a clamping cooperation method, which is convenient for the assembly of the contact holder, the moving iron core and the driving block, and the assembly efficiency is higher.

[0016] The moving contact bridge adopts a double-contact structure design, and the contact opening distance is large, the contact pressure is large, so the contact resistance is small, the contact will not heat up when a large current passes through it, and the contact temperature rise is small when a large current passes through it. The contact spring and reset spring can accelerate the opening and closing speed of the contact frame, and the contact breaks quickly. At the same time, the permanent magnetic arc extinguishing method is adopted, which has a good arc extinguishing effect, reduces the damage to the main contact caused by arcing when the contactor breaks, and extends the service life of the contact. The contact frame triggers two micro switches through the toggle rod, and the working reliability is higher. Therefore, the single-phase AC contactor has the advantages of simple structure, stable and reliable performance, large contact opening distance, small contact resistance, and good arc extinguishing effect.

Claims

1. A single-phase AC contactor, comprising a housing, an electromagnetic drive mechanism, a contact system, two micro switches respectively arranged on both sides of the housing, and an arc extinguishing system, characterized in that: The electromagnetic drive mechanism includes a yoke frame, a coil frame arranged in the yoke frame, a coil arranged on the coil frame, a static iron core arranged in the coil frame, and a moving iron core movably arranged in the coil frame and matched with the static iron core. The contact system includes a contact frame that cooperates with the moving iron core, a moving contact bridge that is linked to the contact frame, a contact spring that is arranged between the moving contact bridge and the contact frame, two static contacts that are symmetrically arranged in the shell and matched with the moving contact bridge, and two permanent magnets that are arranged in the shell at the positions corresponding to the two static contacts. A positioning plate is arranged in the shell at the corresponding positions of the contact frame, and a reset spring is arranged between the positioning plate and the contact frame. Two toggle rods extending outside the shell are provided on both sides of the contact frame. The two toggle rods move with the contact frame and abut against the buttons of the two micro switches to realize the connection or disconnection of the two micro switches.

2. The single-phase AC contactor according to claim 1, characterized in that: The arc extinguishing system includes two groups of arc extinguishing grid plates, two lower arc-striking plates, and an upper arc-striking plate, which are respectively arranged in the housing between the two static contacts and the moving contact bridge. One ends of the two lower arc-striking plates extend into the two groups of arc extinguishing grid plates, and the other ends of the two lower arc-striking plates extend between the permanent magnet and the static contact. Both ends of the upper arc-striking plate extend into the two groups of arc extinguishing grid plates, and the upper arc-striking plate has two arc-striking protrusions at the two ends of the moving contact bridge.

3. The single-phase AC contactor according to claim 1 or 2, characterized in that: The shell is provided with magnetic conductive sheets connected to both ends of the permanent magnet, and one end of the magnetic conductive sheet extends to the arc extinguishing grid sheet group.

4. The single-phase AC contactor according to claim 2, characterized in that: The arc extinguishing grid group comprises a plurality of arc extinguishing grids arranged at intervals in the housing, one end of the plurality of arc extinguishing grids has an arc extinguishing groove, and an arc extinguishing channel matching the motion trajectory of the moving contact bridge is formed between the arc extinguishing grooves of the plurality of arc extinguishing grids.

5. The single-phase AC contactor according to claim 1 or 2, characterized in that: A guide hole is arranged on the contact frame corresponding to the positioning plate, and the positioning plate is inserted into the guide hole to form a sliding connection between the contact frame and the positioning plate.

6. The single-phase AC contactor according to claim 1 or 2, characterized in that: A driving block is arranged between the contact frame and the moving iron core, a snap-in convex strip is arranged on one side of the driving block, a snap-in groove matching with the snap-in convex strip is arranged on the moving iron core, the snap-in convex strip is snapped in the snap-in groove, and constitutes the linkage cooperation between the driving block and the contact frame, a snap-in block is arranged on the other side of the driving block, a snap-in groove matching with the snap-in block is arranged on the contact frame, the snap-in block is snapped in the groove, and constitutes the linkage cooperation between the contact frame and the driving block.

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