CN213212064U

CN213212064U - Non-polar DC contactor

Info

Publication number: CN213212064U
Application number: CN202022288095.5U
Authority: CN
Inventors: 黄秋平; 高云雅
Original assignee: Xgvac Technology Shanghai Co ltd
Current assignee: Xgvac Technology Shanghai Co ltd
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2021-05-14
Anticipated expiration: 2030-10-14

Abstract

The utility model relates to a non-polar DC contactor, which comprises a shell, a coil is arranged at the bottom of the shell, a bottom plate, a porcelain shell and a ceramic sealing ring are arranged in the shell, the ceramic sealing ring is positioned between the bottom plate and the porcelain shell, the bottom plate, the ceramic sealing ring and the porcelain shell are connected to form a sealed cavity, a static electrode is arranged on the porcelain shell in a penetrating way, a movable electrode plate is arranged in the sealed cavity, a magnetic pole guide sleeve positioned in the coil is arranged at one side of the bottom plate, the magnetic pole guide sleeve and the bottom plate form a sealed cavity, a movable magnetic core slides in the sealed cavity, the movable magnetic core is provided with a position limiting part penetrating through the bottom plate and the movable electrode plate, a counter-force spring and an over-travel spring are sleeved on the movable rod, the counter-force spring is abutted against the movable magnetic core, the over-travel spring is abutted against the movable electrode plate, an air duct communicated, the movable magnetic core is provided with a vent hole penetrating through the movable magnetic core. This application has the awkward problem of improving direct current contactor existence.

Description

Non-polar DC contactor

Technical Field

The application relates to the technical field of direct current contactors, in particular to a non-polar direct current contactor.

Background

At present, most of the existing sealed direct current contactors in the market use a permanent magnetic field to extinguish the arc generated when the contactor is switched on and off, so as to achieve the purpose of thoroughly switching off the load. The specific principle is as follows: the electric arc generated when the contacts are disconnected is lengthened by utilizing the magnetic field, and the complete disconnection between the contacts is realized after the energy of the electric arc is weakened. The arcs on both sides of the contact must be opposite in direction to achieve the purpose of arc extinction. When the directions of the electric arcs are the same, the electric arcs on the two sides are converged, and disconnection between the contacts cannot be realized. Therefore, the traditional direct current contactor has the defect that the positive on-off performance is far larger than the negative on-off performance.

With the continuous popularization and application of the sealed direct current contactor in the new energy automobile industry and the photovoltaic device industry, higher requirements are provided for the negative on-off performance of the direct current contactor, and the existing direct current contactor cannot meet the requirements of users.

In view of the above-mentioned related art, the inventor believes that there is a defect that the conventional dc contactor is inconvenient to use.

SUMMERY OF THE UTILITY MODEL

In order to improve the inconvenient problem that DC contactor exists, this application provides a nonpolarity DC contactor.

The application provides a non-polarity direct current contactor adopts following technical scheme:

a nonpolarity direct current contactor comprises a sealed shell, wherein an annular coil is installed at the bottom of the shell, a bottom plate, a porcelain shell and a ceramic sealing ring are installed in the shell, the ceramic sealing ring is positioned between the bottom plate and the porcelain shell, the bottom plate, the ceramic sealing ring and the porcelain shell are connected to form a sealed cavity, a static electrode penetrates through the porcelain shell, a movable electrode plate is arranged in the sealed cavity, a magnetic pole guide sleeve positioned in the coil is arranged on one side of the bottom plate, the magnetic pole guide sleeve and the bottom plate form a sealed cavity, a movable magnetic core slides in the sealed cavity, a movable rod penetrating through the bottom plate and the movable electrode plate is arranged on the movable magnetic core, an insulating limit part for limiting the movable electrode plate is arranged on the movable rod, a fixed plate is arranged in the middle of the movable rod, the fixed plate is positioned in the sealed cavity, a counter force spring and an over travel spring are sleeved on the movable rod, the over travel spring is abutted against the moving electrode plate, the ceramic shell is provided with an air duct communicated with the sealed cavity, the bottom plate is provided with a communicating hole communicated with the sealed cavity and the sealed cavity, and the moving magnetic core is provided with an air vent penetrating through the moving magnetic core.

By adopting the technical scheme, the vent hole is convenient for communicating the two chambers separated by the passive magnetic core in the closed chamber, and the movable magnetic core is convenient to move; the setting of air duct is convenient for pour into inert gas into after to the evacuation in the sealed chamber, protects the object in the sealed chamber, and the intercommunicating pore makes inert gas protect moving the magnetic core for direct current contactor operation is more stable, and simultaneously, life obtains the guarantee.

Preferably, the base plate is integrally formed with a boss protruding from the surface of the base plate, and the boss is in positioning fit with the magnetic pole guide sleeve.

By adopting the technical scheme, the boss positions the magnetic pole guide sleeve, so that the magnetic pole guide sleeve can be conveniently and quickly mounted. Meanwhile, the lug boss plays a role in guiding the moving rod, so that the moving rod runs more stably.

Preferably, one side of the boss, which is far away from the bottom plate, is provided with a positioning caulking groove for positioning the counter force spring.

Through adopting above-mentioned technical scheme, the location caulking groove is used for fixing a position reaction spring, in the use, has prevented effectively that reaction spring and moving pole from taking place the contact.

Preferably, one side of the movable magnetic core facing the boss is provided with a positioning groove for positioning the counter force spring.

Through adopting above-mentioned technical scheme, positioning groove is used for fixing a position reaction spring, subtracts the weight to moving the magnetic core simultaneously, and when the coil circular telegram, produced magnetic field ordered about moving the magnetic core and moved towards the bottom plate direction.

Preferably, the moving rod is sleeved with a shock pad, and the shock pad is located between the bottom plate and the fixing plate.

Through adopting above-mentioned technical scheme, the shock pad plays the effect of elastic buffer, slows down the collision that takes place between fixed plate and the bottom plate.

Preferably, the moving rod is sleeved with a spring gasket, and the spring gasket is located between the over-travel spring and the fixing plate.

Through adopting above-mentioned technical scheme, the spring shim is used for protecting the fixed plate, reduces the damage of overtravel spring in use to the fixed plate.

Preferably, the movable magnetic core is in threaded fit with the movable rod.

Through adopting above-mentioned technical scheme, be convenient for adjust the distance between magnetic core and the bottom plate, move the motion stroke of pole promptly, be convenient for simultaneously to moving the magnetic core, moving the pole and install.

Preferably, insulating locating part includes insulator ring and jump ring, the insulator ring cover is established and is moved on the pole and with the cooperation of pegging graft of moving the electrode plate, the jump ring joint is moving on the pole.

Through adopting above-mentioned technical scheme, the insulator ring plays insulating protection's effect, and the jump ring is convenient for dismantle and install fast with moving the pole.

In summary, the present application includes at least one of the following beneficial technical effects:

the vent hole is convenient for communicating two chambers separated by the passive magnetic core in the closed chamber and is convenient for the movement of the movable magnetic core; the arrangement of the gas guide pipe is convenient for injecting inert gas into the sealed cavity after vacuumizing to protect objects in the sealed cavity, and the communicating hole ensures that the inert gas protects the moving magnetic core, so that the direct current contactor is more stable in operation, and meanwhile, the service life is ensured;

the boss is used for positioning the magnetic pole guide sleeve, so that the magnetic pole guide sleeve can be conveniently and quickly mounted. Meanwhile, the lug boss plays a role in guiding the moving rod, so that the moving rod can run more stably;

the positioning groove is used for positioning the counter-force spring and lightening the movable magnetic core, and when the coil is electrified, the generated magnetic force drives the movable magnetic core to move towards the direction of the bottom plate.

Drawings

FIG. 1 is a schematic cross-sectional view of an embodiment of the present application;

FIG. 2 is a schematic structural diagram of an embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of a sealed chamber and an enclosed chamber in an embodiment of the present application;

FIG. 4 is a schematic cross-sectional view of a trigger device in an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a partial element in an embodiment of the present application, mainly showing a structure of a shield;

figure 6 is a schematic cross-sectional view of a shield, arc chute and magnets in an embodiment of the present application;

FIG. 7 is a schematic cross-sectional view of a base plate, a mounting bracket, a coil, a bobbin, and a pole casing in an embodiment of the present application;

FIG. 8 is a schematic sectional view of the housing, the energy-saving circuit board, the circuit board cover and the fixing frame in the embodiment of the present application;

FIG. 9 is an exploded view of an energy-saving circuit board and a circuit board cover according to an embodiment of the present application;

fig. 10 is a circuit block diagram of an energy-saving circuit board in an embodiment of the present application.

Description of reference numerals: 1. a housing; 101. a housing; 102. an outer cover; 2. a base plate; 201. a boss; 202. a sliding hole; 203. sinking a groove; 204. positioning the caulking groove; 205. a communicating hole; 206. a positioning ring; 207. an outer edge groove; 3. a porcelain shell; 4. a ceramic seal ring; 401. a bending section; 5. a movable magnetic core; 501. a vent hole; 502. a positioning groove; 6. a coil; 7. a magnetic pole guide sleeve; 8. a magnetic pole jacket; 801. a step slot; 9. a moving bar; 901. a fixing plate; 10. a movable electrode plate; 11. a counter-force spring; 12. an over travel spring; 13. an insulating limit member; 131. an insulating ring; 132. a clamp spring; 14. a static electrode; 15. an air duct; 16. a shock pad; 17. a spring washer; 18. a microswitch; 19. a switch circuit board; 20. an auxiliary synchronization support; 21. an isolation cover; 22. an arc extinguishing chamber; 221. inserting the groove; 23. a fixed mount; 231. a threading opening; 232. a central jack; 233. mounting holes; 24. a framework; 25. an auxiliary lead; 26. an energy-saving circuit board; 261. positioning holes; 27. a circuit board cover; 271. a positioning column; 272. mounting a column; 28. fixing the bolt; 29. and a magnet.

Detailed Description

The present application is described in further detail below with reference to figures 1-10.

The non-polar direct current contactor, after the contactor coil circular telegram, coil current produces the magnetic field, makes quiet iron core produce electromagnetic attraction and attracts moving core to drive the contact action: the normally closed contact is opened, and the normally open contact is closed, and the normally closed contact and the normally open contact are linked. When the coil is powered off, the electromagnetic attraction disappears, and the armature is released under the action of the release spring to restore the contact: the normally open contact is open and the normally closed contact is closed.

The embodiment of the application discloses a non-polar direct current contactor. Referring to fig. 1, the contactor includes a closed housing 1, and the housing 1 plays a role of protection. Install coil 6 in the casing 1, the static 14 is worn to be equipped with at the top of casing 1, installs trigger device and moving electrode plate 10 in the casing 1, and coil 6 circular telegram back produces the magnetic field for trigger device motion, trigger device drive moving electrode plate 10 and static 14 contact.

Referring to fig. 2, the housing 1 includes a casing 101 and an outer cover 102 covering each other, and the outer cover 102 is fixedly disposed on the top of the casing 101. The bottom of the casing 101 is formed with the otic placode relatively, wears to be equipped with fixing bolt 28 on the otic placode, is convenient for fix direct current contactor.

Referring to fig. 1 and 3, a bottom plate 2 is installed in a housing 101, the bottom plate 2 is located in the middle of the housing 101, the bottom plate 2 is a rotating body, an opening is formed in one side of the bottom plate 2, a ceramic sealing ring 4 and a ceramic shell 3 are installed on one side of the opening of the bottom plate 2, an outer edge groove 207 is formed in the outer side of the opening of the bottom plate 2, one end of the ceramic sealing ring 4 is inserted into the outer edge groove 207, the ceramic shell 3 is fixed to the other end of the ceramic sealing ring 4, and the bottom plate 2, the ceramic shell 3 and the ceramic sealing ring 4 form a sealing chamber.

Referring to fig. 1 and 3, a magnetic pole guide sleeve 7 with an opening at one side is fixed on one side of the bottom plate 2, which is away from the opening of the bottom plate 2, and is sealed with the bottom plate 2 to form a closed chamber. The base plate 2 deviates from the base plate 2 open-ended one side integrated into one piece has boss 201, and magnetic pole uide bushing 7 cover is established on boss 201, and boss 201 is convenient for install magnetic pole uide bushing 7 fast. The open side of the magnetic pole guide sleeve 7 is outwards turned, a sunken groove 203 is coaxially formed on one side of the base plate 2 departing from the open side of the base plate 2, and the outward turned edge of the magnetic pole guide sleeve 7 is positioned and installed in the sunken groove 203.

Referring to fig. 3, the trigger device of the dc contactor is installed in the sealed cavity and the closed cavity, the ceramic shell 3 is provided with the air duct 15, the air duct 15 is arranged to facilitate vacuum-pumping treatment in the sealed cavity and inert gas filling into the sealed cavity, and the sealing plate is provided with a communication hole 205 for communicating the sealed cavity and the closed cavity, so as to facilitate protection of the trigger device in the sealed cavity and the closed cavity.

Referring to fig. 3 and 4, the movable magnetic core 5 is slidably mounted in the magnetic pole guide sleeve 7, the movable magnetic core 5 is fixed with a movable rod 9 penetrating from the sealed chamber, the movable magnetic core 5 is in threaded fit with the movable rod 9, so that the movable magnetic core 5 and the movable rod 9 can be conveniently detached and fixed, and the distance between the movable magnetic core 5 and the bottom plate 2, namely the movement stroke of the movable rod 9, can be adjusted. A fixing plate 901 is integrally formed in the middle of the moving rod 9, the fixing plate 901 is located in the sealed cavity, one end, located in the sealed cavity, of the moving rod 9 penetrates through the moving electrode plate 10, and an insulating limiting piece 13 for limiting the moving electrode plate 10 is clamped at the end of the moving rod 9. The movable rod 9 is provided with a reaction spring 11 and an over travel spring 12 in a penetrating way, the reaction spring 11 is positioned between the movable magnetic core 5 and the bottom plate 2, and the over travel spring 12 is positioned between the movable electrode plate 10 and the bottom plate 2. In a natural state, the fixed plate 901 abuts against the bottom plate 2, two ends of the reaction spring 11 respectively abut against the moving magnetic core 5 and the bottom plate 2, and the overtravel spring 12 maximizes the distance between the fixed plate 901 and the moving electrode plate 10.

Referring to fig. 4, the boss 201 has a positioning insertion groove 204 formed on a side facing the movable core 5 for positioning the reaction spring 11. The positioning caulking groove 204 is used for positioning the reaction spring 11, so that damage to the reaction spring 11 when the movable magnetic core 5 is installed is reduced, and meanwhile, the reaction spring 11 is prevented from contacting the movable rod 9.

Referring to fig. 4, a positioning groove 502 for positioning the reaction spring 11 is formed on the side of the movable core 5 facing the boss 201. The positioning groove 502 is used for positioning the reaction spring 11, and reduces damage to the reaction spring 11 when the movable core 5 is mounted. At the same time, the movable magnetic core 5 is convenient to reduce weight.

Referring to fig. 4, the movable magnetic core 5 is provided with a vent hole 501 penetrating through the movable magnetic core 5, and the vent hole 501 is communicated with two chambers separated by the passive magnetic core 5 in the magnetic pole guide sleeve 7, so as to facilitate the movement of the movable magnetic core 5.

Referring to fig. 4, the moving rod 9 is sleeved with a shock pad 16, the shock pad 16 is a pad body supported by rubber, and the shock pad 16 is located between the fixing plate 901 and the bottom plate 2. The shock pad 16 is used for buffering the impact force between the moving rod 9 and the bottom plate 2, and performing buffering protection on the moving rod 9 and the bottom plate 2.

Referring to fig. 4, the moving rod 9 is sleeved with an auxiliary synchronizing bracket 20, one side of the auxiliary synchronizing bracket 20 abuts against the fixed plate 901, and the other side abuts against the over travel spring 12. A spring gasket 17 sleeved on the moving rod 9 is arranged between the over travel spring 12 and the auxiliary synchronous bracket 20. The auxiliary synchronizing bracket 20 is integrally formed with a sliding sleeve which is in sliding fit with the moving rod 9 and is positioned in the overtravel spring 12, and one end of the sliding sleeve is positioned in the small end of the insulating ring 131 and is in sliding fit with the small end of the insulating ring 131.

Referring to fig. 4, the insulation limiting member 13 includes an insulation ring 131 and a snap spring 132. The insulating ring 131 is an outer stepped cylindrical structure, the moving electrode plate 10 is sleeved on the small end of the insulating ring 131 and is in sliding fit with the insulating ring 131, the insulating ring 131 is in sliding fit with the moving rod 9, and the large end of the insulating ring 131 is located on one side of the moving electrode plate 10, which is far away from the over travel spring 12. The end of the moving rod 9 is provided with a clamping groove, the clamping groove is clamped with the clamping spring 132, and the clamping spring 132 limits the moving electrode plate 10.

Referring to fig. 5, a microswitch 18 is fixed on the outer side of the arc-extinguishing chamber 22, one end of an auxiliary synchronizing bracket 20 penetrates out of the arc-extinguishing chamber 22, one end of the auxiliary synchronizing bracket 20 is located below the microswitch 18, a switch circuit board 19 is fixed on the top of the microswitch 18, an auxiliary lead 25 is installed on the housing 1, and the switch circuit board 19 is electrically connected with the microswitch 18 and the auxiliary lead 25. The movement of the moving rod 9 drives the movement of the auxiliary synchronous switch, which in turn triggers the on or off of the microswitch 18.

Referring to fig. 5 and 6, one end of the static electrode 14 penetrates through the porcelain shell 3, and the static electrode 14 is located on the side of the movable electrode plate 10 facing away from the bottom plate 2. Install arc-extinguishing cover 22 in the sealed cavity, arc-extinguishing cover 22's both ends are contradicted with bottom plate 2, porcelain shell 3 respectively, and arc-extinguishing cover 22 covers the trigger device who is located in the sealed cavity and establishes for electric arc extinguishes. Inserting grooves 221 are formed in the two opposite sides of the arc-extinguishing chamber 22, magnets 29 are installed in the inserting grooves 221, an isolation cover 21 for isolating the trigger device is installed in the arc-extinguishing chamber 22, and the isolation cover 21 is fixed on the bottom plate 2.

Referring to fig. 7, a cylindrical fixing frame 23 is installed at the bottom of the casing 101, the fixing frame 23 is sleeved inside the casing 101, the top of the fixing frame 23 is in insertion fit with the bottom plate 2, a positioning ring 206 is formed on the bottom plate 2, and the fixing frame 23 is in insertion fit with the positioning ring 206. Skeleton 24 is installed to the internal sliding of mount 23, and one side that skeleton 24 is close to bottom plate 2 is inconsistent with bottom plate 2, and coil 6 twines in skeleton 24, and the bottom edge of mount 23 has seted up through wires hole 231, and the one end of coil 6 is worn out from through wires hole 231. The magnetic pole guide sleeve 7 is arranged in the framework 24 in a penetrating mode, the magnetic pole outer sleeve 8 is installed on the fixing frame 23 in a locating mode, the step slot 801 is formed in the outer side of the bottom of the magnetic pole outer sleeve 8, the fixing frame 23 is coaxially provided with the central insertion hole 232, the magnetic pole outer sleeve 8 is located and inserted in the central insertion hole 232 of the fixing frame 23, the groove face of the step slot 801 is attached to the fixing frame 23, and the magnetic pole outer sleeve 8 is matched with the framework 24 in a sliding mode. The magnetic pole outer sleeve 8 is in insertion fit with the magnetic pole guide sleeve 7, and the magnetic pole outer sleeve 8 reduces the damage of the movable magnetic core 5 to the magnetic pole guide sleeve 7 in the moving process.

When 6 circular telegrams of coil, 6 magnetic fields that produce of coil, magnetic field make move magnetic core 5 and slide along the direction of magnetic pole uide bushing 7 towards bottom plate 2, and then compress reaction spring 11, and at this in-process, move pole 9 and drive and move electrode plate 10 and static 14 contact, when moving pole 9 continuous motion, overtravel spring 12 compresses, and the accurate laminating of moving electrode plate 10 and static 14 reduces the pressure that moves electrode plate 10 and static 14 and received, plays the cushioning effect. After the energization of the coil 6 is stopped, the fixed plate 901 abuts against the bottom plate 2 under the elastic force of the reaction spring 11 and the over travel spring 12, and the distance between the fixed plate 901 and the moving electrode plate 10 is the largest.

Referring to fig. 8, an energy-saving circuit board 26 is mounted at the bottom of the casing 101, the energy-saving circuit board 26 is electrically connected to the coil 6, and the energy-saving circuit board 26 is located between the fixing frame 23 and the bottom of the casing 101. A circuit board cover 27 covering the energy-saving circuit board 26 is mounted at the bottom of the housing 101, and the circuit board cover 27 abuts against the fixing frame 23. A support portion for supporting the fixing frame 23 is integrally formed at the bottom of the housing 101, and the height of the support portion is equal to the thickness of the circuit board cover 27. The peripheral lateral wall integrated into one piece in bottom of shell 101 has the enhancement strip, strengthens the structural strength that the strip is used for strengthening shell 101, strengthens the strip simultaneously and contradicts with mount 23.

Referring to fig. 8 and 9, holes for passing electric wires are respectively formed at two ends of the circuit board cover 27, so that the circuit board cover 27 can be freely installed on the energy-saving circuit board 26. Two positioning columns 271 are integrally formed inside the circuit board cover 27, the positioning columns 271 are symmetrically distributed along the symmetrical plane of the circuit board cover 27, and positioning holes 261 for positioning and matching the positioning columns 271 are formed in the surface of the energy-saving circuit board 26. The top of the circuit board cover 27 is integrally formed with a mounting post 272, the bottom of the fixing frame 23 is provided with a mounting hole 233 matched with the mounting post 272 in a positioning manner, and the mounting post 272 is matched with the mounting hole 233 in a positioning insertion manner, so that the fixing frame 23 and the circuit board cover 27 can be conveniently mounted.

Referring to fig. 10, the energy-saving circuit board 26 includes a polarity modulation module and a PWM modulation module thereon. The polarity modulation module is used for preventing the direct current circuit from being reversely connected and ensuring the direction of the magnetic field. The duty ratio of the PWM module achieves the effect of saving electric energy.

The implementation principle of the non-polar direct current contactor in the embodiment of the application is as follows:

when the magnetic field generator is used, the direct current is electrically connected to the energy-saving circuit board 26, and the polarity modulation module on the energy-saving circuit board 26 prevents the direct current circuit from being reversely connected, so that the direction of the magnetic field is ensured. The duty ratio of the PWM modulation module on the energy-saving circuit board 26 achieves the effect of saving electric energy. The vent hole 501 is formed to facilitate communication between the two chambers separated by the passive magnetic core 5 in the closed chamber, so as to facilitate movement of the movable magnetic core 5; the setting of stand pipe is convenient for pour into inert gas into after to the evacuation in the sealed chamber, protects the object in the sealed chamber, and intercommunicating pore 205 makes inert gas protect moving magnetic core 5 for direct current contactor operation is more stable, and simultaneously, life is ensured.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A non-polar direct current contactor comprises a sealed shell (1), wherein an annular coil (6) is installed at the bottom of the shell (1), a bottom plate (2), a porcelain shell (3) and a ceramic sealing ring (4) are installed in the shell (1), the ceramic sealing ring (4) is located between the bottom plate (2) and the porcelain shell (3), the bottom plate (2), the ceramic sealing ring (4) and the porcelain shell (3) are connected to form a sealed cavity, a static electrode (14) penetrates through the porcelain shell (3), a movable electrode plate (10) is arranged in the sealed cavity, a magnetic pole guide sleeve (7) located in the coil (6) is arranged on one side of the bottom plate (2), the magnetic pole guide sleeve (7) and the bottom plate (2) form a sealed cavity, a movable magnetic core (5) slides in the sealed cavity, a movable rod (9) passing through the bottom plate (2) and the movable electrode plate (10) is arranged on the movable magnetic core (5), move and be equipped with on pole (9) to moving spacing insulating locating part (13) of electrode board (10), the middle part of moving pole (9) is equipped with fixed plate (901), fixed plate (901) are located sealed cavity, move and be equipped with reaction spring (11) and over travel spring (12) on pole (9), reaction spring (11) are contradicted with moving magnetic core (5), and over travel spring (12) are contradicted with moving electrode board (10), its characterized in that: be equipped with air duct (15) with sealed cavity intercommunication on porcelain shell (3), set up intercommunication (205) that communicate sealed cavity, closed cavity on bottom plate (2), be equipped with on moving magnetic core (5) and run through air vent (501) of moving magnetic core (5).

2. The non-polar dc contactor of claim 1, wherein: the magnetic pole guide sleeve is characterized in that a boss (201) protruding out of the surface of the base plate (2) is integrally formed on the base plate (2), and the boss (201) is in positioning fit with the magnetic pole guide sleeve (7).

3. The non-polar dc contactor of claim 2, wherein: and one side of the boss (201) far away from the bottom plate (2) is provided with a positioning caulking groove (204) for positioning the reaction spring (11).

4. The non-polar dc contactor of claim 3, wherein: one side of the movable magnetic core (5) facing the boss (201) is provided with a positioning groove (502) for positioning the reaction spring (11).

5. The non-polar dc contactor of claim 1, wherein: the shock absorption pad (16) is sleeved on the moving rod (9), and the shock absorption pad (16) is located between the bottom plate (2) and the fixing plate (901).

6. The non-polar dc contactor of claim 5, wherein: the moving rod (9) is sleeved with a spring gasket (17), and the spring gasket (17) is located between the over-travel spring (12) and the fixing plate (901).

7. The non-polar dc contactor of claim 1, wherein: the movable magnetic core (5) is in threaded fit with the movable rod (9).

8. The non-polar dc contactor of claim 1, wherein: insulating locating part (13) include insulator ring (131) and jump ring (132), insulator ring (131) cover is established and is moved pole (9) and with move electrode board (10) grafting cooperation, jump ring (132) joint is moving on pole (9).