Small-size direct current contactor

Abstract

The utility model relates to a small-size direct current contactor which comprises a base, an electromagnetic assembly arranged on the base and a contact system, and the electromagnetic assembly comprises a coil framework, a yoke, a coil, a static iron core, a movable iron core and a push plate. The contact system comprises a static contact arranged on the base, a moving contact arranged on the pushing plate in a linkage mode and an arc extinguishing cover arranged on the base and covering the static contact, and one end of the moving contact is provided with a moving contact part extending into the arc extinguishing cover and matched with the static contact. One end of the static contact is provided with a static contact part which extends into the arc extinguishing chamber and is matched with the movable contact part, a first arc striking sheet and a second arc striking sheet are respectively arranged in the arc extinguishing chamber, one end of the first arc striking sheet extends towards the movable contact part, and one end of the second arc striking sheet is propped against the static contact part. The utility model has the advantages of simple structure, stable and reliable performance, convenient assembly, good protection performance and small volume.

Description

TECHNICAL FIELD

[0001] The utility model relates to contactor technical field, concretely relates to a small volume direct current contactor. BACKGROUND

[0002] The contactor is an electric appliance for controlling load by using the magnetic field generated by the current flowing through the coil to close the contact in the industrial electricity. The contactor is composed of an electromagnetic system (armature, static iron core, electromagnetic coil), contact system (normally open contact and normally closed contact) and arc extinguishing device. The principle of the electromagnetic contactor is that when the electromagnetic coil of the contactor is powered, a strong magnetic field is generated to attract the armature by the electromagnetic attraction of the static iron core, and the contact is actuated: the normally closed contact is opened, the normally open contact is closed, and the two are linked. When the coil is powered off, the electromagnetic attraction disappears, and the armature is released under the action of the release spring, so that the contact is restored: the normally closed contact is closed, and the normally open contact is opened.

[0003] At present, the contactors in the electric locomotive, harmonious locomotive, substation and other large current industrial control occasions often burn out. The action mechanism and contact mechanism of the contactor are designed unreasonably, the volume is large, the arc extinguishing performance is poor. And the contactor also has the defects of poor protection performance, unreliable performance and inconvenient assembly. SUMMARY

[0004] The utility model aims at overcoming the defects of prior art, and provides a small volume direct current contactor with simple structure, stable and reliable performance, convenient assembly and good protection performance.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts a small volume direct current contactor, which comprises a base, an electromagnetic assembly arranged on the base and a contact system. The electromagnetic assembly comprises a coil framework arranged on the base, a yoke arranged on the coil framework, a coil arranged on the coil framework, a static iron core arranged in the coil framework, a movable iron core movably arranged on the coil framework and matched with the static iron core, and a push plate linked to the movable iron core. The contact system comprises a static contact arranged on the base, a movable contact linked to the push plate, and an arc extinguishing cover arranged on the base and covering the static contact. One end of the movable contact has a movable contact part extending in the arc extinguishing cover and matched with the static contact. One end of the static contact has a static contact part extending in the arc extinguishing cover and matched with the movable contact part. The arc extinguishing cover is provided with a first arc guide piece and a second arc guide piece. One end of the first arc guide piece extends towards the movable contact part, and one end of the second arc guide piece abuts against the static contact part.

[0006] The beneficial effects of the above structure are that the moving contact part of the moving contact and the static contact part of the static contact are arranged in the arc extinguishing cover, so that the contact points are prevented from being exposed, the protection performance is better, and the electric arc can quickly enter the arc extinguishing cover, thereby helping to improve the arc extinguishing performance of the direct current contactor, the first arc leading sheet and the second arc leading sheet can quickly lead the electric arc at the moving contact and the static contact into the arc extinguishing chamber, the arc extinguishing effect is better, and the electric arc is prevented from ablation of the moving contact and the static contact, thereby helping to prolong the service life of the moving contact and the static contact.

[0007] In particular, the outer walls on the two sides of the arc extinguishing cover are respectively provided with positioning grooves, magnets are arranged in the positioning grooves, and an insulating cover is arranged on the arc extinguishing cover and covers the magnets. The magnets have a magnetic blowing effect on the electric arc. The magnetic field generated by the magnets causes the electric arc to move under the action of force, thereby rapidly cooling and extinguishing the electric arc. Therefore, the arc extinguishing performance of the direct current contactor is improved.

[0008] In particular, the yoke is provided with an auxiliary switch assembly corresponding to the pushing plate, the auxiliary switch assembly comprises a support plate on the yoke and a plurality of auxiliary switches arranged on the support plate, one end of the pushing plate is provided with a trigger plate matched with the plurality of auxiliary switches, the trigger plate moves with the pushing plate and triggers the plurality of auxiliary switches, and the plurality of auxiliary switches are turned on or turned off. The auxiliary switch adopts a fully sealed structure, is resistant to wind and sand, is maintenance-free, and reduces the maintenance cost of the user. The pushing plate triggers the auxiliary switch through the trigger plate, so that the pushing plate can reliably trigger the auxiliary switch.

[0009] In particular, a clamping spring is arranged between the support plate and the pushing plate, the pushing plate is provided with a limiting groove matched with the clamping spring, the middle part of the clamping spring abuts against the limiting groove, and the two ends of the clamping spring are clamped in the clamping grooves of the support plate. The elastic force of the clamping spring can increase the pressure of the pushing plate and the moving contact, thereby increasing the contact pressure of the moving contact and the static contact, and ensuring that the moving contact and the static contact are in contact more reliably.

[0010] In particular, the other end of the moving contact is connected to the pushing plate, the pushing plate is provided with a positioning rod, the moving contact is provided with a positioning hole matched with the positioning rod, the positioning rod is inserted into the positioning hole, and the positioning rod and the moving contact are in limiting cooperation. The positioning rod of the pushing plate has a positioning effect on the moving contact, thereby ensuring that the connection between the moving contact and the pushing plate is more compact. BRIEF DESCRIPTION OF DRAWINGS

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

[0012] Fig. 2 The utility model embodiment is exploded view.

[0013] Fig. 3 The utility model embodiment is sectional view. DETAILED DESCRIPTION

[0014] As Figs. 1-3 The utility model discloses a small volume DC contactor, including base 10, set up the electromagnetic assembly 20 of base 10, contact system 30, electromagnetic assembly 20 includes the coil former 21 of setting up on base 10, set up yoke iron 22 on coil former 21, set up coil 23 on coil former 21, set up static iron core 24 in coil former 21, set up movablely on coil former 21 and with static iron core 24 cooperation's dynamic iron core 25, linkage set up on dynamic iron core 25 and push the board 26, contact system 30 includes set up static contact 31 on base 10, linkage set up dynamic contact 32 on push the board 26, set up arc extinguishing chamber 33 on base 10 and cover in static contact 31, dynamic contact 32 one end has and with static contact 31 cooperation's dynamic contact portion 321 that extends in arc extinguishing chamber 33, static contact 31 one end has and with dynamic contact portion 321 cooperation's static contact portion 311 that extends in arc extinguishing chamber 33, arc extinguishing chamber 33 respectively set up with first arc -striking piece 331, second arc -striking piece 332, first arc -striking piece 331 one end extends to dynamic contact portion 321 direction, second arc -striking piece 332 one end and resist on static contact portion 311. Arc extinguishing chamber 33 both sides's outer wall respectively set up with positioning slot 331, positioning slot 331 set up with magnet 34, arc extinguishing chamber 33 set up with the insulating cover 35 that covers magnet 34. Magnet plays the magnetic blow effect to electric arc, and the magnetic field that magnet generates will make electric arc receive the force and produce movement, to cool down rapidly, make electric arc extinguish. Thus be favorable to improving the arc extinguishing performance of this DC contactor. Yoke iron 22 on corresponding push the board 26 set up with auxiliary switch assembly 40, auxiliary switch assembly 40 includes the support plate 41 on yoke iron 22, set up multiple auxiliary switches 42 on support plate 41, push the board 26 one end has and with multiple auxiliary switches 42 cooperation's trigger plate 261, trigger plate 261 with push the board 26 action and trigger multiple auxiliary switches 42, and realize multiple auxiliary switches 42's on or off. Auxiliary switch adopts the full sealing structure, prevents the sand, maintenance-free, reduces the maintenance cost of user. And push the board triggers auxiliary switch through trigger plate, can guarantee that push the board can reliably trigger auxiliary switch.

[0015] As Fig. 1 and 3As shown, the support plate 41 and the push plate 26 are provided with a snap spring 43, the push plate 26 is provided with a limiting groove 262 matched with the snap spring 43, the middle part of the snap spring 43 is in contact with the limiting groove 262, and the two ends of the snap spring 43 are respectively clamped in the clamping groove 411 of the support plate 41. The elastic force of the snap spring can increase the pressure of the push plate and the moving contact, thereby increasing the contact pressure of the moving contact and the static contact, and ensuring the contact of the moving contact and the static contact more reliable. The other end of the moving contact 32 is connected to the push plate 26, the push plate 26 is provided with a positioning rod 263, the moving contact 32 is provided with a positioning hole 322 matched with the positioning rod 263, the positioning rod 362 is inserted into the positioning hole 322, and the positioning rod 263 and the moving contact 32 are limitedly matched. The positioning rod of the push plate plays a positioning role on the moving contact, thereby ensuring the connection of the moving contact and the push plate more compact.

[0016] The moving contact part of the moving contact and the static contact part of the static contact are arranged in the arc extinguishing cover, which can avoid exposure of the contact, has better protection performance, and can quickly enter the arc into the arc extinguishing chamber, thereby being beneficial to improve the arc extinguishing performance of the DC contactor. The first arc leading piece and the second arc leading piece can quickly lead the free arc at the moving contact and the static contact into the arc extinguishing chamber, have better arc extinguishing effect, and can avoid arc ablation of the moving contact and the static contact, which is beneficial to prolong the service life of the moving contact and the static contact. The electromagnetic assembly adopts a modular structure design, has smaller volume, and is more convenient to assemble, thereby the DC AC contactor has the advantages of simple structure, stable and reliable performance, convenient assembly, and good protection performance.

Claims

1. A small volume DC contactor comprising a base, an electromagnetic assembly disposed on the base, a contact system, characterized in that: The electromagnetic assembly comprises a coil former arranged on the base, a yoke arranged on the coil former, a coil arranged on the coil former, a static iron core arranged in the coil former, a dynamic iron core movably arranged on the coil former and matched with the static iron core, a push plate movably arranged on the dynamic iron core, the contact system comprises a static contact arranged on the base, a dynamic contact movably arranged on the push plate, an arc extinguishing cover arranged on the base and covering the static contact, the dynamic contact has a dynamic contact part extending in the arc extinguishing cover and matched with the static contact at one end of the dynamic contact, the static contact has a static contact part extending in the arc extinguishing cover and matched with the dynamic contact part at one end of the static contact, the arc extinguishing cover is provided with a first arc striking sheet and a second arc striking sheet respectively, the first arc striking sheet extends in the direction of the dynamic contact part at one end of the first arc striking sheet, and the second arc striking sheet abuts on the static contact part at one end of the second arc striking sheet.

2. The small volume DC contactor of claim 1, wherein: The outer wall of the arc extinguishing cover is provided with a positioning slot on each side, a magnet is arranged in the positioning slot, and an insulating cover is arranged on the arc extinguishing cover and covers the magnet.

3. The small volume DC contactor according to claim 1 or 2, characterized in that: The yoke is provided with an auxiliary switch assembly corresponding to the push plate, the auxiliary switch assembly comprises a support plate on the yoke and a plurality of auxiliary switches arranged on the support plate, the push plate has a trigger plate matched with the plurality of auxiliary switches at one end of the push plate, the trigger plate moves with the push plate and triggers the plurality of auxiliary switches, and the plurality of auxiliary switches are turned on or turned off.

4. The small volume DC contactor of claim 3, wherein: A clamping spring is arranged between the support plate and the push plate, the push plate is provided with a limiting slot matched with the clamping spring, the middle part of the clamping spring abuts in the limiting slot, and the two ends of the clamping spring are clamped in the clamping grooves of the support plate respectively.

5. The small volume DC contactor according to claim 1 or 2, characterized in that: The other end of the dynamic contact is connected to the push plate, the push plate is provided with a positioning rod, the dynamic contact is provided with a positioning hole matched with the positioning rod, the positioning rod is inserted into the positioning hole, and the positioning rod and the dynamic contact are limitedly matched.

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