CN218676966U

CN218676966U - Auxiliary contact mechanism of high-voltage direct-current contactor

Info

Publication number: CN218676966U
Application number: CN202223020486.4U
Authority: CN
Inventors: 张立军
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-03-21
Anticipated expiration: 2032-11-14

Abstract

The utility model belongs to the technical field of the technique of contactor and specifically relates to a supplementary contact mechanism of high voltage direct current contactor is related to, it includes the casing, set up in base and two auxiliary contact in the casing draw forth the end, the casing is provided with two main contacts, the base is close to main contact one side is provided with the support frame, be provided with on the support frame be used for with two the movable contact piece of main contact butt, two the bottom that the end was drawn forth to the auxiliary contact is provided with first supplementary contact and second supplementary contact respectively, be provided with in the casing and be used for fixing first supplementary contact with the auxiliary stand of second supplementary contact, the base outer wall is provided with and is used for promoting the dead man of second supplementary contact, the support frame with constitute the sliding chamber between the base, be provided with in the sliding chamber and be used for promoting the base is along the promotion subassembly of vertical direction motion. This application has the effect that reduces the influence of addding auxiliary contact to the product volume.

Description

Auxiliary contact mechanism of high-voltage direct-current contactor

Technical Field

The application relates to the technical field of contactors, in particular to an auxiliary contact mechanism of a high-voltage direct-current contactor.

Background

At present, new energy automobiles and charging facilities are rapidly developed, new energy equipment and equipment are controlled by a direct current contactor, the market capacity of the direct current contactor, which is one of key electrical elements in the new energy equipment, is expanded, and the direct current contactor is mainly applied to a power distribution system of military equipment and is also used for main power supply loop switching in the fields of new energy electric automobiles, charging piles, energy storage, photovoltaics, power supplies, communication and the like; however, the dc contactors on the market are divided into two major categories, one with auxiliary contacts and the other without auxiliary contacts; the direct current contactor is required to be provided with the auxiliary contact in the application occasions such as the field of charging piles and energy storage in the new energy industry, and the operating personnel can judge whether the state of the main contact of the direct current contactor is closed or opened through the auxiliary contact, so that the safety of the operating personnel during operation is improved.

The fixed mode that uses more auxiliary switch in the market is the mode of increasing micro-gap switch in contactor inside, but limited and micro-gap switch all is the standard part, volume and shape do not can enlarge and reduce according to actual space, there is relative limitation, and micro-gap switch's cost is also comparatively expensive, however in prior art, general auxiliary contact is mutually perpendicular's structural layout with the movable contact piece, the vertically overall arrangement structure is when needing to increase auxiliary contact, also can increase the volume of product simultaneously, when the volume of product receives the restriction, this just causes the difficulty to addding auxiliary contact, need improve to this condition.

Disclosure of Invention

In order to reduce the influence of addding auxiliary contact to the product volume, this application provides a high voltage direct current contactor's auxiliary contact mechanism.

The application provides a pair of high voltage direct current contactor's auxiliary contact mechanism adopts following technical scheme:

an auxiliary contact mechanism of a high-voltage direct-current contactor comprises a shell, a base and two auxiliary contact leading-out ends, wherein the base is arranged in the shell, two main contacts are arranged on one side, close to the base, of the shell, a supporting frame is arranged on one side, close to the main contacts, of the base, movable contact sheets used for being abutted to the two main contacts are arranged on the supporting frame, the two auxiliary contact leading-out ends are respectively arranged at the top wall of the shell, the bottom ends of the two auxiliary contact leading-out ends extend into a cavity of the shell, a first auxiliary contact sheet and a second auxiliary contact sheet are respectively arranged at the bottom ends of the two auxiliary contact leading-out ends, an auxiliary support used for fixing the first auxiliary contact sheet and the second auxiliary contact sheet is arranged in the shell, a pull rod used for pushing the second auxiliary contact sheet is arranged on the outer wall of the base, a sliding cavity is formed between the supporting frame and the base, and a pushing assembly used for pushing the base to move in the vertical direction is arranged in the sliding cavity.

By adopting the technical scheme, the auxiliary contact mechanism pushes the base to move towards the main contact direction through the pushing assembly, so that the movable contact piece is abutted against the main contact, the pull rod is driven to push the second auxiliary contact piece to move towards the first auxiliary contact piece, after the movable contact piece is abutted against the main contact, the abutting is also completed by the second auxiliary contact piece and the first auxiliary contact piece, at the moment, a loop is formed between the leading-out end of the auxiliary contact and the first auxiliary contact piece and the second auxiliary contact piece, the monitoring effect of the auxiliary loop on the main contact loop is realized, an operator can judge whether the state of the main contact of the direct current contactor is closed or disconnected through the leading-out end of the auxiliary contact, compared with the traditional auxiliary contact structure adopting a vertical structure layout, when the auxiliary contact needs to be added, the volume of a product also needs to be increased, when the volume of the contactor is limited, the difficulty is caused by adding the leading-out end of the auxiliary contact, the auxiliary contact structure in the application adopts a horizontal structure layout, and the influence of adding the auxiliary contact on the volume of the product can be reduced.

Optionally, the pushing assembly includes a push rod with one end disposed in the sliding chamber and the other end penetrating through the sliding chamber, and a pressure spring with one end disposed on one side of the support frame close to the push rod and the other end sleeved on the push rod, and one side of the push rod away from the base is connected with the magnetic circuit portion of the housing.

By adopting the technical scheme, through for the pressurization of contactor coil part, the coil produces electromagnetic attraction, make the push rod overcome the counter force that the pressure spring produced, move towards the main contact direction, thereby the dead lever moves towards the direction of second auxiliary contact, make second auxiliary contact and first auxiliary contact butt back form the auxiliary circuit, when the main contact return circuit need be disconnected, through stopping giving the pressurization of contactor coil part, make the electromagnetic force disappear, the counter action power of pressure spring is passed through again, make the push rod move towards keeping away from the main contact direction, make the dead lever move towards keeping away from the direction of second auxiliary contact.

Optionally, the casing is close to auxiliary stand one side is provided with the mounting panel, the mounting panel is close to auxiliary stand one side is provided with the mounting groove, the mounting groove orientation dead man one side is provided with the confession the hole that slides that the auxiliary stand slided, be provided with in the mounting groove and be used for fixing the fixed subassembly of auxiliary stand.

Through adopting above-mentioned technical scheme, the auxiliary stand slides towards the mounting groove inner wall through the hole of sliding, in the auxiliary stand imbeds the mounting groove for the auxiliary stand installs on the mounting panel, recycles fixed subassembly, fixes the auxiliary stand in the mounting groove, strengthens the stability of auxiliary stand.

Optionally, the fixing component comprises an elastic block, the auxiliary support is close to the limiting portion on one side of the inner wall of the mounting groove, the mounting groove is close to one side of the limiting portion and is provided for the limiting groove embedded into the limiting portion, and the elastic block is arranged on one side of the sliding hole and close to the mounting groove.

Through adopting above-mentioned technical scheme, through spacing portion embedding spacing groove, strengthen the fastness of the installation of auxiliary stand, during the installation auxiliary stand, through in compressing behind the elastic block with auxiliary stand embedding mounting groove, when the auxiliary stand imbeds the mounting groove completely, the elastic block is after the bounce again for elastic block and auxiliary stand butt utilize the elastic block to support the auxiliary stand, improve the stability of auxiliary stand.

Optionally, an arc extinguishing chamber is arranged on one side of the housing, which is close to the main contact, and the opening of the arc extinguishing chamber faces one side of the base.

By adopting the technical scheme, electric arcs can be generated when the main contact and the movable contact of the contactor are in contact, certain damage is caused to the contactor, the arc factors can be cooled by filling inert gas into the arc extinguishing cover, the extinction of the electric arcs is accelerated, and the influence of the electric arcs on the service life of the contactor is reduced.

Optionally, the arc-extinguishing chamber is close to base one side is provided with the fixed plate, the fixed plate is close to auxiliary stand one side is provided with and is used for right first supplementary contact and the spacing hole of second supplementary contact spacing.

By adopting the technical scheme, the first auxiliary contact is close to one side of the leading-out end of the auxiliary contact and the second auxiliary contact is close to one side of the leading-out end of the auxiliary contact to be separated through the limiting hole, so that the probability of failure of the auxiliary loop caused by mutual contact of the connecting end of the first auxiliary contact and the leading-out end of the auxiliary contact and the connecting end of the second auxiliary contact and the leading-out end of the auxiliary contact is reduced.

Optionally, a bending portion is disposed on one side of the first auxiliary contact far away from the contact end and on one side of the second auxiliary contact far away from the contact end.

Through adopting above-mentioned technical scheme, increase the elasticity of first auxiliary contact and second auxiliary contact through the kink, when the dead lever when keeping away from the second auxiliary contact direction motion, the second auxiliary contact can in time be separated with first auxiliary contact, breaks off when realizing auxiliary circuit and main contact return circuit, reduces the error when operation personnel judge direct current contactor main contact state.

Optionally, the first auxiliary contact piece and the second auxiliary contact piece are fixed to the auxiliary support in an injection molding manner.

Through adopting above-mentioned technical scheme, make first auxiliary contact and second auxiliary contact fix on auxiliary stand through injection moulding's mode, on the plastics that will be heated and melt were jetted into auxiliary stand by injection molding machine high pressure, through cooling solidification back, obtain the finished product, compare in remaining fixed mode, adopt the mode of moulding plastics to practice thrift the cost that the product was made in this application scheme.

Optionally, one side of the elastic block, which is far away from the auxiliary bracket, is provided with an inclined surface.

Through adopting above-mentioned technical scheme, utilize the inclined plane to make the installation of auxiliary stand more convenient, the auxiliary stand passes through the inclined plane, through the butt on auxiliary stand and inclined plane, in the auxiliary stand compression elastic block embedding mounting groove of being more convenient for.

Optionally, the arc-extinguishing chamber is provided as a ceramic chamber.

By adopting the technical scheme, the ceramic cover is adopted, and the ceramic material is high temperature resistant and electric corrosion resistant, so that the cooling arc extinguishing effect is achieved, the arc extinguishing cover can be effectively prevented from deforming under the firing of high temperature and electric sparks, the use safety and reliability of the electromagnetic contactor are improved, and the service life of the electromagnetic contactor is prolonged.

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

1. compared with the traditional auxiliary contact structure which adopts a vertical structure layout, when the auxiliary contact needs to be additionally arranged, the volume of a product needs to be increased, when the volume of the contactor is limited, the difficulty in additionally arranging the leading-out end of the auxiliary contact is caused, and the auxiliary contact structure in the scheme of the application adopts a horizontal structure layout, so that the influence of the additionally arranged auxiliary contact on the volume of the product can be reduced;

2. by pressurizing the coil part of the contactor, the coil generates electromagnetic attraction, so that the push rod overcomes the reverse force generated by the pressure spring and moves towards the main contact, the pull rod moves towards the direction of the second auxiliary contact, and the second auxiliary contact and the first auxiliary contact are abutted to form an auxiliary loop;

3. when the auxiliary support is installed, the auxiliary support is embedded into the installation groove after the elastic block is compressed, when the auxiliary support is completely embedded into the installation groove, the elastic block is abutted against the auxiliary support after the elastic block rebounds, the auxiliary support is supported by the elastic block, and the stability of the auxiliary support is improved;

4. the ceramic cover is adopted, and the ceramic material is high temperature resistant and electric corrosion resistant, so that the cooling arc extinguishing effect is achieved, the arc extinguishing cover can be effectively prevented from deforming under the firing of high temperature and electric sparks, the use safety and reliability of the electromagnetic contactor are improved, and the service life of the electromagnetic contactor is prolonged.

Drawings

Figure 1 is a cross-sectional view of an arc chute and movable contact in an embodiment of the present application;

FIG. 2 is a schematic structural view of an auxiliary stand and a lever in an embodiment of the present application;

FIG. 3 is a schematic structural view of a base and a stem in an embodiment of the present application;

figure 4 is a cross-sectional view of an arc chute and accessory bracket in an embodiment of the present application;

FIG. 5 is an enlarged view of portion A of FIG. 4 in an embodiment of the present application;

FIG. 6 is an exploded view of the mounting plate and auxiliary bracket of the embodiment of the present application;

fig. 7 is a schematic structural view of an auxiliary holder and an auxiliary contact terminal in an embodiment of the present application;

fig. 8 is a schematic structural view of the first auxiliary contact and the second auxiliary contact in the embodiment of the present application.

Description of reference numerals:

1. a housing; 2. a base; 3. an auxiliary contact leading-out terminal; 4. a main contact; 5. a support frame; 6. a movable contact piece; 7. a first auxiliary contact; 8. a second auxiliary contact; 9. an auxiliary support; 10. pulling a rod; 11. a sliding chamber; 12. a push rod; 13. compressing the spring; 14. mounting a plate; 15. mounting grooves; 16. a sliding hole; 17. a limiting part; 18. a limiting groove; 19. an elastic block; 20. an arc extinguishing chamber; 21. a fixing plate; 22. a limiting hole; 23. a bending part.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses high voltage direct current contactor's auxiliary contact mechanism. Referring to fig. 1 and 2, including casing 1, install base 2 and two auxiliary contacts in casing 1 and draw forth end 3, casing 1 is close to base 2 one side and installs two main contacts 4, base 2 is close to main contact 4 one side and installs support frame 5, support frame 5 installs movable contact 6 that is used for with two main contacts 4 butt, two auxiliary contacts draw forth end 3 install respectively in the roof department of casing 1 and stretch respective bottom to the wall body of casing 1, first auxiliary contact 7 and second auxiliary contact 8 are installed respectively to two auxiliary contacts draw forth end 3's low side, install dead man 10 that is used for promoting second auxiliary contact 8 in the casing 1, bearing sliding chamber 11 between support frame 5 and the base 2, install in the sliding chamber 11 and be used for promoting the base 2 along the promotion subassembly of vertical direction motion.

In the embodiment of the application, the auxiliary contact mechanism pushes the base 2 to move towards the direction of the main contact 4 through the pushing component, so that the movable contact 6 is abutted to the main contact 4, and meanwhile, the pulling rod 10 is also driven to push the second auxiliary contact 8 to move towards the direction of the first auxiliary contact 7, after the movable contact 6 is abutted to the main contact 4, the second auxiliary contact 8 is also abutted to the first auxiliary contact 7, at the moment, a loop is formed between the auxiliary contact leading-out end 3 and the first auxiliary contact 7 as well as between the first auxiliary contact 8 and the second auxiliary contact 7, the monitoring effect of the auxiliary loop on the loop of the main contact 4 is realized, the auxiliary contact leading-out end 3 is fixed with the shell 1 in an injection molding mode, the auxiliary contact leading-out end 3 can be made into any shape such as a column shape, a square shape and the like, an operator can judge that the state of the main contact 4 of the direct current contactor is closed or open through the auxiliary contact leading-out end 3, compared with the traditional auxiliary contact structure, a vertical structure layout is adopted, if the auxiliary contact needs to be additionally provided, the auxiliary contact, the volume needs to be increased, when the volume of the contactor is limited, the auxiliary contact leading-out end 3, difficulty is increased, the auxiliary contact structure, and the auxiliary contact structure can be reduced.

Referring to fig. 3 and 4, in the embodiment of the present application, the pushing assembly includes a push rod 12 and a pressure spring 13, one end of the push rod 12 is installed in the sliding chamber 11, the other end of the push rod 12 penetrates through the sliding chamber 11, one end of the pressure spring 13 is installed on one side of the support frame 5 close to the push rod 12, the other end of the pressure spring 13 is sleeved on the push rod 12, and one side of the push rod 12 far from the base 2 is connected to the magnetic circuit portion of the housing 1; in the embodiment of the application, by pressurizing the coil part of the contactor, the coil generates electromagnetic attraction, so that the push rod 12 overcomes the reverse force generated by the pressure spring 13 and moves towards the direction of the main contact 4, thereby driving the pull rod 10 to move towards the direction of the second auxiliary contact 8, so that the second auxiliary contact 8 and the first auxiliary contact 7 are abutted to form an auxiliary loop, when the contactor needs to turn off the loop, the pressurization on the contactor coil is stopped, the reaction force of the pressure spring 13 is reused to make the base 2 move towards the direction far away from the main contact 4, thereby driving the pull rod 10 to move away from the direction of the second auxiliary contact 8, so that the second auxiliary contact 8 is separated from the first auxiliary contact 7, and the auxiliary loop is turned off.

Referring to fig. 5 and 6, a mounting plate 14 is mounted on one side of the casing 1 close to the auxiliary support 9, a mounting groove 15 for the auxiliary support 9 to be embedded into is formed on one side of the mounting plate 14 close to the auxiliary support 9, a sliding hole 16 for the auxiliary support 9 to slide is formed in one side of the mounting groove 15 facing the dead lever 10, a fixing component for fixing the auxiliary support 9 is mounted in the mounting groove 15, in the embodiment of the present application, the fixing component includes a limiting portion 17, a limiting groove 18 and an elastic block 19, the limiting portion 17 is mounted on one side of the auxiliary support 9 close to the inner wall of the mounting groove 15, the limiting groove 18 is formed in one side of the mounting groove 15 close to the limiting portion 17 and is used for the limiting groove 18 for the limiting portion 17 to be embedded into, and the elastic block 19 is mounted on one side of the mounting groove 15 close to the sliding hole 16; the side, away from the auxiliary support 9, of the elastic block 19 is provided with an inclined surface, the auxiliary support 9 is more convenient to mount by utilizing the inclined surface, and the auxiliary support 9 is more convenient to compress the elastic block 19 to be embedded into the mounting groove 15 through the inclined surface; in this embodiment, when installing auxiliary stand 9, through after auxiliary stand 9 and elastic block 19 butt, through compress in elastic block 19 after with auxiliary stand 9 embedding mounting groove 15, when auxiliary stand 9 imbeds completely in mounting groove 15, elastic block 19 rebounds the back for elastic block 19 and auxiliary stand 9 butt utilize elastic block 19 to support auxiliary stand 9, recycle spacing portion 17 embedding spacing inslot 18, strengthen the fastness of the installation of auxiliary stand 9.

Referring to fig. 1, an arc extinguishing chamber 20 is installed on one side of a housing 1 close to a main contact 4, and the opening of the arc extinguishing chamber 20 faces one side of a base 2, the arc extinguishing chamber 20 is a ceramic chamber, in the embodiment of the present application, when a contactor forms a loop, the main contact 4 and a movable contact 6 are abutted, an electric arc is easily generated, a certain damage is caused to the contactor, the ceramic chamber can be adopted, ceramic materials are high temperature resistant and resistant to electric corrosion, the cooling and arc extinguishing effects are achieved, meanwhile, the arc extinguishing chamber 20 can be effectively prevented from deforming under the firing of high temperature and electric sparks, and the use safety, reliability and service life of the electromagnetic contactor are improved.

Referring to fig. 7 and 8, a fixing plate 21 is installed on one side of the arc extinguishing chamber 20 close to the base 2, a limiting hole 22 for limiting the first auxiliary contact piece 7 and the second auxiliary contact piece 8 is formed in the fixing plate 21 close to the auxiliary support 9, in the embodiment of the present application, the first auxiliary contact piece 7 and the second auxiliary contact piece 8 are separated from one side of the auxiliary contact leading-out end 3 close to the auxiliary contact through the limiting hole 22, and the probability that the auxiliary circuit fails due to the fact that the connecting end of the first auxiliary contact piece 7 and the auxiliary contact leading-out end 3 and the connecting end of the second auxiliary contact piece 8 and the auxiliary contact leading-out end 3 contact with each other is reduced.

Referring to fig. 6 and 7, the first auxiliary contact 7 and the second auxiliary contact 8 are fixed to the auxiliary holder 9 by injection molding; the side of the first auxiliary contact piece 7, which is far away from the contact end, and the side of the second auxiliary contact piece 8, which is far away from the contact end, are provided with bent parts 23, the elasticity of the first auxiliary contact piece 7 and the second auxiliary contact piece 8 is increased through the bent parts 23, and when the pull rod 10 moves towards the direction far away from the second auxiliary contact piece 8, the second auxiliary contact piece 8 can be separated from the first auxiliary contact piece 7 in time; in this application embodiment, make first auxiliary contact 7 and second auxiliary contact 8 fix on auxiliary support 9 through injection moulding's mode, will be heated the plastics that melts and inject into auxiliary support 9 by the injection molding machine high pressure on, through cooling solidification, obtain the finished product, compare in remaining fixed mode, adopt the mode of moulding plastics in this application scheme and practice thrift the cost of product manufacturing.

The implementation principle of the auxiliary contact mechanism of the high-voltage direct-current contactor in the embodiment of the application is as follows: the auxiliary contact mechanism pushes the base 2 to move towards the main contact 4 through the pushing assembly, so that the movable contact piece 6 is abutted against the main contact 4, and simultaneously drives the shifting rod 10 to push the second auxiliary contact piece 8 to move towards the first auxiliary contact piece 7, after the movable contact piece 6 is abutted against the main contact 4, the second auxiliary contact piece 8 is abutted against the first auxiliary contact piece 7, and at the moment, a loop is formed between the auxiliary contact leading-out end 3 and the first auxiliary contact piece 7 and the second auxiliary contact piece 8; when the circuit of the main contact 4 needs to be disconnected, the electromagnetic force disappears by stopping pressurizing the coil part of the contactor, and then the push rod 12 moves towards the direction far away from the main contact 4 by the reverse acting force of the compression spring 13, the main contact 4 is separated from the movable contact 6, the circuit of the main contact 4 is disconnected, the pull rod 10 moves towards the direction far away from the second auxiliary contact 8, the first auxiliary contact 7 is separated from the second auxiliary contact 8, and the circuit of the auxiliary contact is disconnected; the monitoring function of the auxiliary circuit on the main contact 4 circuit is realized, and an operator can judge whether the state of the main contact 4 of the direct current contactor is closed or opened through the auxiliary contact leading-out end 3, so that the safety of the operator during operation is improved; compared with the design of applying a micro switch as an auxiliary contact, the micro switch and the limited micro switch are standard parts, the size and the shape of the micro switch cannot be enlarged or reduced according to the actual space, the micro switch has relative limitation, the cost of the micro switch is expensive, the scheme in the application adopts a mechanical structure to complete the connection and disconnection of the auxiliary loop, the monitoring of the main contact 4 loop is realized, the manufacturing cost of a product is saved, and the size and the shape of the structure can be correspondingly adjusted according to the structure of the actual product; compare in traditional auxiliary contact structure and adopt the vertical structure overall arrangement, if need add auxiliary contact, also need increase the volume of product simultaneously, when the volume of contactor received the restriction, this just draws forth end 3 to addding auxiliary contact and causes the difficulty, and the scheme auxiliary contact structure in this application adopts the horizontal structure overall arrangement, can reduce to add the influence of auxiliary contact to the product volume.

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. An auxiliary contact mechanism of a high-voltage direct-current contactor comprises a shell (1), a base (2) arranged in the shell (1) and two auxiliary contact leading-out ends (3), it is characterized in that one side of the shell (1) close to the base (2) is provided with two main contacts (4), a supporting frame (5) is arranged on one side of the base (2) close to the main contact (4), the support frame (5) is provided with a movable contact piece (6) which is used for being abutted against the two main contacts (4), the two auxiliary contact leading-out ends (3) are respectively arranged at the top wall of the shell (1) and extend the respective bottom ends into the cavity of the shell (1), the bottom ends of the two auxiliary contact leading-out ends (3) are respectively provided with a first auxiliary contact piece (7) and a second auxiliary contact piece (8), an auxiliary bracket (9) used for fixing the first auxiliary contact (7) and the second auxiliary contact (8) is arranged in the shell (1), the outer wall of the base (2) is provided with a pull rod (10) used for pushing the second auxiliary contact piece (8), a sliding chamber (11) is formed between the supporting frame (5) and the base (2), and a pushing assembly for pushing the base (2) to move along the vertical direction is arranged in the sliding chamber (11).

2. The auxiliary contact mechanism of the high-voltage direct-current contactor according to claim 1, wherein the pushing assembly comprises a push rod (12) having one end disposed in the sliding chamber (11) and the other end penetrating through the sliding chamber (11), and a compression spring (13) having one end disposed on one side of the supporting frame (5) close to the push rod (12) and the other end sleeved on the push rod (12), and one side of the push rod (12) far from the base (2) is connected to the magnetic circuit portion of the housing (1).

3. The auxiliary contact mechanism of the high-voltage direct current contactor according to claim 1, wherein a mounting plate (14) is arranged on one side, close to the auxiliary support (9), of the housing (1), a mounting groove (15) is arranged on one side, close to the auxiliary support (9), of the mounting plate (14), a sliding hole (16) for the auxiliary support (9) to slide is formed in one side, facing the pulling rod (10), of the mounting groove (15), and a fixing component for fixing the auxiliary support (9) is arranged in the mounting groove (15).

4. The auxiliary contact mechanism of the HVDC contactor of claim 3, wherein the fixing component comprises a limiting portion (17) disposed on one side of the auxiliary bracket (9) close to the inner wall of the mounting groove (15), a limiting groove (18) disposed on one side of the mounting groove (15) close to the limiting portion (17) and for the limiting portion (17) to be embedded in, and an elastic block (19) disposed on one side of the mounting groove (15) close to the sliding hole (16).

5. An auxiliary contact mechanism of a high-voltage direct-current contactor according to claim 1, characterized in that an arc extinguishing chamber (20) is arranged on one side of the housing (1) close to the main contact (4), and the opening of the arc extinguishing chamber (20) faces to one side of the base (2).

6. Auxiliary contact mechanism of a hvdc contactor according to claim 5, characterized in that said arc-extinguishing chamber (20) is provided with a fixing plate (21) near said base (2), and said fixing plate (21) is provided with a limiting hole (22) near said auxiliary support (9) for limiting said first auxiliary contact (7) and said second auxiliary contact (8).

7. An auxiliary contact mechanism of a hvdc contactor according to claim 1, characterized in that said first auxiliary contact piece (7) and said second auxiliary contact piece (8) are provided with a bent portion (23) at a side away from the contact end.

8. Auxiliary contact mechanism for an hvdc contactor according to claim 1, characterized in that said first auxiliary contact blade (7) and said second auxiliary contact blade (8) are fixed to said auxiliary holder (9) by means of injection molding.

9. Auxiliary contact mechanism for an hvdc contactor according to claim 4, characterized in that the side of the resilient block (19) facing away from the auxiliary support (9) is bevelled.

10. Auxiliary contact mechanism for an hvdc contactor according to claim 5, characterized in that said arc chute (20) is provided as a ceramic shield.