Auxiliary contact mechanism of high voltage DC contactor

Abstract

The present application relates to the technical field of contactors, and in particular to an auxiliary contact mechanism of a high-voltage DC contactor, comprising a housing, a base disposed within the housing, and two auxiliary contact lead-out terminals, wherein the housing is provided with two main contacts, a support frame is provided on the side of the base close to the main contacts, a movable contact piece for contacting the two main contacts is provided on the support frame, a first auxiliary contact piece and a second auxiliary contact piece are provided at the bottom ends of the two auxiliary contact lead-out terminals, respectively, an auxiliary bracket for fixing the first auxiliary contact piece and the second auxiliary contact piece is provided within the housing, a pull rod for pushing the second auxiliary contact piece is provided on the outer wall of the base, a sliding chamber is formed between the support frame and the base, and a pushing component for pushing the base to move in a vertical direction is provided within the sliding chamber. The present application has the effect of reducing the impact of adding auxiliary contacts on the product volume.

Description

Technical Field

[0001] The present application relates to the technical field of contactors, and in particular to an auxiliary contact mechanism of a high-voltage direct current contactor. Background Art

[0002] At present, new energy vehicles and charging facilities are developing rapidly. New energy equipment and equipment all need DC contactors to control them. The market capacity of DC contactors, one of the key electrical components in new energy equipment, has also expanded accordingly. DC contactors are mainly used in the power distribution system of military equipment, and are also used for main power circuit switching in new energy electric vehicles, charging piles, energy storage, photovoltaics, power supply and communications. However, DC contactors on the market are divided into two categories, one with auxiliary contacts and the other without auxiliary contacts. In new energy industry charging piles and energy storage fields and other applications, DC contactors with auxiliary contacts are required. Through the auxiliary contacts, operators can judge whether the state of the DC contactor main contacts is closed or disconnected, thereby improving the safety of operators during operation.

[0003] The most commonly used method of fixing auxiliary switches on the market is to add a micro switch inside the contactor. However, the micro switch is a standard part, and its size and shape cannot be enlarged or reduced according to the actual space, which has relative limitations. In addition, the cost of the micro switch is relatively expensive. However, in the existing technology, the auxiliary contacts and the moving contact pieces are generally arranged in a perpendicular structure. When the auxiliary contacts need to be added, the vertical layout structure will also increase the volume of the product. When the volume of the product is limited, it will cause difficulties in adding auxiliary contacts. This situation needs to be improved. Summary of the Invention

[0004] In order to reduce the impact of adding auxiliary contacts on product volume, the present application provides an auxiliary contact mechanism for a high-voltage DC contactor.

[0005] The present application provides an auxiliary contact mechanism for a high-voltage DC contactor, which adopts the following technical solution:

[0006] The auxiliary contact mechanism of a high-voltage DC contactor comprises a shell, a base arranged in the shell and two auxiliary contact lead-out terminals, the shell being provided with two main contacts on one side close to the base, the base being provided with a support frame on one side close to the main contact, the support frame being provided with a moving contact piece for abutting the two main contacts, the two auxiliary contact lead-out terminals being respectively arranged at the top wall of the shell and extending their respective bottom ends into the cavity of the shell, the bottom ends of the two auxiliary contact lead-out terminals being respectively provided with a first auxiliary contact piece and a second auxiliary contact piece, an auxiliary bracket for fixing the first auxiliary contact piece and the second auxiliary contact piece being provided in the shell, a pull rod for pushing the second auxiliary contact piece being provided on the outer wall of the base, a sliding chamber being formed between the support frame and the base, and a pushing component for pushing the base to move in a vertical direction being provided in the sliding chamber.

[0007] By adopting the above technical solution, the auxiliary contact mechanism pushes the base toward the main contact by pushing the assembly, so that the moving contact piece abuts against the main contact, and at the same time drives the pull rod to push the second auxiliary contact piece toward the first auxiliary contact piece. When the moving contact piece abuts against the main contact, the second auxiliary contact piece and the first auxiliary contact piece also complete the abutment. At this time, a loop is formed between the auxiliary contact lead-out end and the first auxiliary contact piece and the second auxiliary contact piece, realizing the monitoring function of the auxiliary circuit on the main contact circuit. The operator can use the auxiliary contact lead-out end to enable the operator to judge whether the state of the DC contactor main contact is closed or disconnected. Compared with the traditional auxiliary contact structure adopts a vertical structural layout, when auxiliary contacts need to be added, the volume of the product also needs to be increased. When the volume of the contactor is limited, this makes it difficult to add auxiliary contact lead-out ends. The auxiliary contact structure of the solution in this application adopts a horizontal structural layout, which can reduce the impact of adding auxiliary contacts on the volume of the product.

[0008] Optionally, the pushing assembly includes a push rod with one end arranged in the sliding chamber and the other end passing through the sliding chamber, a compression spring with one end arranged on the side of the support frame close to the push rod and the other end sleeved on the push rod, and the push rod is connected to the magnetic circuit part of the shell away from the base.

[0009] By adopting the above technical solution, by applying pressure to the contactor coil part, the coil generates electromagnetic attraction, so that the push rod overcomes the reverse force generated by the compression spring and moves toward the main contact, thereby moving the pull rod toward the second auxiliary contact piece, so that the second auxiliary contact piece and the first auxiliary contact piece abut against each other to form an auxiliary circuit. When the main contact circuit needs to be disconnected, the electromagnetic force disappears by stopping applying pressure to the contactor coil part, and then the reverse force of the compression spring causes the push rod to move away from the main contact, so that the pull rod moves away from the second auxiliary contact piece.

[0010] Optionally, a mounting plate is provided on the side of the shell close to the auxiliary bracket, a mounting groove is provided on the side of the mounting plate close to the auxiliary bracket, a sliding hole is provided on the side of the mounting groove facing the pull rod for the auxiliary bracket to slide, and a fixing component for fixing the auxiliary bracket is provided in the mounting groove.

[0011] By adopting the above technical solution, the auxiliary bracket slides toward the inner wall of the installation groove through the sliding hole. When the auxiliary bracket is embedded in the installation groove, the auxiliary bracket is installed on the mounting plate, and then the fixing component is used to fix the auxiliary bracket in the installation groove, thereby enhancing the stability of the auxiliary bracket.

[0012] Optionally, the fixing assembly includes a limiting portion arranged on the side of the auxiliary bracket close to the inner wall of the installation groove, a limiting groove arranged on the side of the installation groove close to the limiting portion and for the limiting portion to be embedded, and an elastic block arranged on the side of the installation groove close to the sliding hole.

[0013] By adopting the above technical solution, the limiting part is embedded in the limiting groove to enhance the installation firmness of the auxiliary bracket. When installing the auxiliary bracket, the auxiliary bracket is embedded in the installation groove after compressing the elastic block. When the auxiliary bracket is completely embedded in the installation groove, the elastic block rebounds, causing the elastic block to abut against the auxiliary bracket, and the elastic block is used to support the auxiliary bracket, thereby improving the stability of the auxiliary bracket.

[0014] Optionally, an arc extinguishing hood is provided on a side of the shell close to the main contact, and a cover opening of the arc extinguishing hood is directed toward a side of the base.

[0015] By adopting the above technical solution, an arc will be generated when the main contact and the moving contact of the contactor come into contact, causing certain damage to the contactor. By filling the arc extinguishing hood with inert gas, the arc factor can be cooled, the arc can be extinguished faster, and the impact of the arc on the service life of the contactor can be reduced.

[0016] Optionally, a fixing plate is provided on a side of the arc extinguishing cover close to the base, and a limiting hole for limiting the first auxiliary contact and the second auxiliary contact is provided on a side of the fixing plate close to the auxiliary bracket.

[0017] By adopting the above technical solution, the first auxiliary contact piece close to the auxiliary contact lead-out terminal and the second auxiliary contact piece close to the auxiliary contact lead-out terminal are separated by the limiting hole, thereby reducing the probability of the connection end between the first auxiliary contact piece and the auxiliary contact lead-out terminal and the connection end between the second auxiliary contact piece and the auxiliary contact lead-out terminal contacting each other, thereby causing the auxiliary circuit to fail.

[0018] Optionally, a side of the first auxiliary contact piece away from the contact end and a side of the second auxiliary contact piece away from the contact end are both provided with a bending portion.

[0019] By adopting the above technical solution, the elasticity of the first auxiliary contact and the second auxiliary contact is increased by the bending portion. When the pull rod moves in a direction away from the second auxiliary contact, the second auxiliary contact can be separated from the first auxiliary contact in time, thereby achieving simultaneous disconnection of the auxiliary circuit and the main contact circuit, thereby reducing the error when the operator judges the status of the main contact of the DC contactor.

[0020] Optionally, the first auxiliary contact piece and the second auxiliary contact piece are fixed to the auxiliary bracket by injection molding.

[0021] By adopting the above technical solution, the first auxiliary contact and the second auxiliary contact are fixed to the auxiliary bracket by injection molding, and the heated and melted plastic is injected into the auxiliary bracket at high pressure by an injection molding machine. After cooling and solidification, a molded product is obtained. Compared with other fixing methods, the injection molding method used in this application solution saves product manufacturing costs.

[0022] Optionally, the elastic block is configured as an inclined surface on a side away from the auxiliary bracket.

[0023] By adopting the above technical solution, the inclined surface is used to facilitate the installation of the auxiliary bracket. The auxiliary bracket passes through the inclined surface, and the abutment between the auxiliary bracket and the inclined surface makes it easier for the auxiliary bracket to compress the elastic block and embed it into the installation groove.

[0024] Optionally, the arc extinguishing cover is configured as a ceramic cover.

[0025] By adopting the above technical solution, a ceramic cover is used. The ceramic material is resistant to high temperature and electrical corrosion, which not only plays a role in cooling and arc extinguishing, but also effectively prevents the arc extinguishing cover from deforming under high temperature and electric spark burning, thereby improving the safety, reliability and service life of the electromagnetic contactor.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. Compared with the traditional auxiliary contact structure that adopts a vertical structure layout, when additional auxiliary contacts are needed, the volume of the product also needs to be increased. When the volume of the contactor is limited, this makes it difficult to add auxiliary contact leads. The auxiliary contact structure of the solution in this application adopts a horizontal structure layout, which can reduce the impact of additional auxiliary contacts on the product volume;

[0028] 2. By applying pressure to the contactor coil, the coil generates electromagnetic attraction, causing the push rod to overcome the opposing force generated by the compression spring and move toward the main contact. This causes the pull rod to move toward the second auxiliary contact, causing the second auxiliary contact to abut against the first auxiliary contact, forming an auxiliary circuit.

[0029] 3. When installing the auxiliary bracket, compress the elastic block and then embed the auxiliary bracket into the installation slot. When the auxiliary bracket is completely embedded in the installation slot, the elastic block rebounds, causing the elastic block to abut against the auxiliary bracket, and the elastic block supports the auxiliary bracket, thereby improving the stability of the auxiliary bracket.

[0030] 4. The ceramic cover is resistant to high temperature and electrical corrosion. It not only plays the role of cooling and arc extinguishing, but also effectively prevents the arc extinguishing cover from deformation under high temperature and electric spark burning, thereby improving the safety, reliability and service life of the electromagnetic contactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a cross-sectional view of the arc extinguishing cover and the moving contact piece in the embodiment of the present application;

[0032] Figure 2 This is a schematic structural diagram of the auxiliary bracket and the pull rod in an embodiment of the present application;

[0033] Figure 3 This is a schematic structural diagram of the base and the pull rod in an embodiment of the present application;

[0034] Figure 4 is a cross-sectional view of the arc extinguishing cover and the auxiliary bracket in the embodiment of the present application;

[0035] Figure 5 In the embodiment of this application Figure 4 Enlarged view of part A;

[0036] Figure 6 is an exploded view of the mounting plate and the auxiliary bracket in an embodiment of the present application;

[0037] Figure 7 This is a schematic structural diagram of the auxiliary bracket and the auxiliary contact lead-out terminal in an embodiment of the present application;

[0038] Figure 8 Schematic diagram of the structure of the first auxiliary contact and the second auxiliary contact in an embodiment of the present application.

[0039] Description of reference numerals:

[0040] 1. Shell; 2. Base; 3. Auxiliary contact lead-out terminal; 4. Main contact; 5. Support frame; 6. Moving contact piece; 7. First auxiliary contact piece; 8. Second auxiliary contact piece; 9. Auxiliary bracket; 10. Pull rod; 11. Sliding chamber; 12. Push rod; 13. Compression spring; 14. Mounting plate; 15. Mounting slot; 16. Sliding hole; 17. Limiting part; 18. Limiting slot; 19. Elastic block; 20. Arc extinguishing cover; 21. Fixing plate; 22. Limiting hole; 23. Bending part. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-Attached Figure 8 This application is described in further detail.

[0042] The embodiment of the present application discloses an auxiliary contact mechanism of a high voltage DC contactor. Figure 1 and Figure 2 , including a shell 1, a base 2 installed in the shell 1 and two auxiliary contact lead-out terminals 3, two main contacts 4 are installed on the side of the shell 1 close to the base 2, a support frame 5 is installed on the side of the base 2 close to the main contact 4, the support frame 5 is installed with a moving contact piece 6 for abutting against the two main contacts 4, the two auxiliary contact lead-out terminals 3 are respectively installed on the top wall of the shell 1 and their respective bottom ends extend into the wall of the shell 1, the lower ends of the two auxiliary contact lead-out terminals 3 are respectively installed with a first auxiliary contact piece 7 and a second auxiliary contact piece 8, a pull rod 10 for pushing the second auxiliary contact piece 8 is installed in the shell 1, a bearing sliding chamber 11 is installed between the support frame 5 and the base 2, and a pushing component for pushing the base 2 to move in the vertical direction is installed in the sliding chamber 11.

[0043] In the embodiment of the present application, the auxiliary contact mechanism pushes the base 2 toward the main contact 4 by pushing the assembly, so that the movable contact piece 6 abuts against the main contact 4, and at the same time drives the pull rod 10 to push the second auxiliary contact piece 8 toward the first auxiliary contact piece 7. When the movable contact piece 6 abuts against the main contact 4, the second auxiliary contact piece 8 and the first auxiliary contact piece 7 also complete the abutment. At this time, a loop is formed between the auxiliary contact lead-out terminal 3 and the first auxiliary contact piece 7 and the second auxiliary contact piece 8, realizing the monitoring function of the auxiliary circuit on the main contact 4 circuit. The auxiliary contact lead-out terminal 3 is connected to the auxiliary contact 4 by injection molding. The shell 1 is fixed, and the shape of the auxiliary contact lead-out terminal 3 can be made into any shape such as a column, a square, etc. The operator can use the auxiliary contact lead-out terminal 3 to allow the operator to determine whether the state of the DC contactor main contact 4 is closed or disconnected. Compared with the traditional auxiliary contact structure adopts a vertical structural layout, if additional auxiliary contacts are needed, the volume of the product also needs to be increased. When the volume of the contactor is limited, this will cause difficulties in adding the auxiliary contact lead-out terminal 3. The auxiliary contact structure in the solution of this application adopts a horizontal structural layout, which can reduce the impact of adding auxiliary contacts on the product volume.

[0044] Reference Figure 3 and Figure 4In the embodiment of the present application, the pushing assembly includes a push rod 12 and a compression spring 13, one end of the push rod 12 is installed in the sliding chamber 11, and the other end of the push rod 12 passes through the sliding chamber 11, one end of the compression spring 13 is installed on the side of the support frame 5 close to the push rod 12, and the other end of the compression spring 13 is sleeved on the push rod 12, and the push rod 12 is connected to the magnetic circuit part of the shell 1 on the side away from the base 2; in the embodiment of the present application, by pressurizing the contactor coil part, the coil generates electromagnetic attraction, so that the push rod 12 overcomes the reverse force generated by the compression spring 13 and moves toward the main contact 4, thereby driving the pull rod 10 to move toward the direction of the second auxiliary contact 8, so that the second auxiliary contact 8 and the first auxiliary contact 7 abut to form an auxiliary circuit; when the contactor needs to close the circuit, stop pressurizing the contactor coil, and then use the reaction force of the compression spring 13 to make the base 2 move in the direction away from the main contact 4, thereby driving the pull rod 10 to move away from the second auxiliary contact 8, so that the second auxiliary contact 8 and the first auxiliary contact 7 are separated, so that the auxiliary circuit is disconnected.

[0045] Reference Figure 5 and Figure 6 A mounting plate 14 is installed on the side of the housing 1 close to the auxiliary bracket 9. A mounting groove 15 for the auxiliary bracket 9 to be embedded is opened on the side of the mounting plate 14 close to the auxiliary bracket 9. The mounting groove 15 is opened on the side facing the pull rod 10 for the auxiliary bracket 9 to slide. A fixing component for fixing the auxiliary bracket 9 is installed 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 installed on the side of the auxiliary bracket 9 close to the inner wall of the mounting groove 15. The limiting groove 18 is opened on the side of the mounting groove 15 close to the limiting portion 17 and is a limiting groove 18 for the limiting portion 17 to be embedded. The elastic block 19 is installed on the side of the mounting groove 15 close to the sliding hole 16 ; The elastic block 19 is set as an inclined surface on the side away from the auxiliary bracket 9. The inclined surface makes the installation of the auxiliary bracket 9 more convenient. The auxiliary bracket 9 is easier to compress the elastic block 19 and embed it into the installation groove 15 through the inclined surface. In the embodiment of the present application, when installing the auxiliary bracket 9, after the auxiliary bracket 9 and the elastic block 19 are abutted, the auxiliary bracket 9 is embedded in the installation groove 15 by compressing the elastic block 19. When the auxiliary bracket 9 is completely embedded in the installation groove 15, the elastic block 19 rebounds, so that the elastic block 19 and the auxiliary bracket 9 are abutted. The elastic block 19 is used to support the auxiliary bracket 9, and then the limiting part 17 is used to be embedded in the limiting groove 18, thereby enhancing the firmness of the installation of the auxiliary bracket 9.

[0046] Reference Figure 1An arc extinguishing cover 20 is installed on the side of the shell 1 close to the main contact 4, and the cover opening of the arc extinguishing cover 20 is facing the side of the base 2. The arc extinguishing cover 20 is set to a ceramic cover. In the embodiment of the present application, when the contactor forms a circuit, the main contact 4 and the moving contact piece 6 are in contact, and an arc is easily generated, causing certain damage to the contactor. A ceramic cover can be used. The ceramic material is resistant to high temperature and electrical corrosion, which not only plays a role in cooling and extinguishing the arc, but also can effectively prevent the arc extinguishing cover 20 from being deformed under high temperature and electric spark burning, thereby improving the safety, reliability and service life of the electromagnetic contactor.

[0047] Reference Figure 7 and Figure 8 A fixing plate 21 is installed on the side of the arc extinguishing cover 20 close to the base 2, and a limiting hole 22 for limiting the first auxiliary contact 7 and the second auxiliary contact 8 is opened on the fixing plate 21 close to the auxiliary bracket 9. In the embodiment of the present application, the first auxiliary contact 7 and the second auxiliary contact 8 are separated from each other near the auxiliary contact lead-out terminal 3 through the limiting hole 22, thereby reducing the probability of the connection end of the first auxiliary contact 7 and the auxiliary contact lead-out terminal 3 and the connection end of the second auxiliary contact 8 and the auxiliary contact lead-out terminal 3 contacting each other, thereby causing the auxiliary circuit to fail.

[0048] Reference Figure 6 and Figure 7 The first auxiliary contact piece 7 and the second auxiliary contact piece 8 are fixed to the auxiliary bracket 9 by injection molding; the first auxiliary contact piece 7 and the second auxiliary contact piece 8 are both provided with a bending portion 23 on the side away from the contact end, and the bending portion 23 increases the elasticity of the first auxiliary contact piece 7 and the second auxiliary contact piece 8. When the pull rod 10 moves in the direction 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 embodiment of the application, the first auxiliary contact piece 7 and the second auxiliary contact piece 8 are fixed to the auxiliary bracket 9 by injection molding, and the heated and melted plastic is injected into the auxiliary bracket 9 at high pressure by the injection molding machine. After cooling and solidification, a molded product is obtained. Compared with other fixing methods, the injection molding method used in the present application saves the cost of product manufacturing.

[0049] The implementation principle of the auxiliary contact mechanism of a high-voltage DC contactor of the present application is as follows: the auxiliary contact mechanism pushes the base 2 toward the main contact 4 through the pushing component, so that the movable contact piece 6 abuts against the main contact 4, and at the same time drives the pull rod 10 to push the second auxiliary contact piece 8 toward the first auxiliary contact piece 7. When the movable contact piece 6 abuts against the main contact 4, the second auxiliary contact piece 8 and the first auxiliary contact piece 7 also complete the abutment. At this time, a circuit is formed between the auxiliary contact lead-out terminal 3 and the first auxiliary contact piece 7 and the second auxiliary contact piece 8; when it is necessary to disconnect the main contact 4 circuit, the electromagnetic force disappears by stopping the pressure on the contactor coil part, and then the reverse action force of the compression spring 13 causes the push rod 12 to move away from the main contact 4, the main contact 4 and the movable contact piece 6 are separated, and the main contact 4 circuit is disconnected, so that the pull rod 10 moves away from the second auxiliary contact piece 8, the first auxiliary contact piece 7 and the second auxiliary contact piece 8 are separated, and the auxiliary contact circuit is disconnected; the auxiliary circuit realizes the monitoring function of the main contact 4 circuit, The auxiliary contact lead-out terminal 3 allows the operator to determine whether the state of the DC contactor main contact 4 is closed or disconnected, thereby improving the safety of the operator during operation; compared with the design of using a micro switch as an auxiliary contact, but limited by the fact that the micro switch is a standard part, the volume and shape cannot be enlarged or reduced according to the actual space, which has relative limitations, and the cost of the micro switch is also relatively expensive. The solution in this application adopts a mechanical structure to complete the connection and disconnection of the auxiliary circuit, realize the monitoring of the main contact 4 circuit, save product manufacturing costs, and the volume and shape of the structure can be adjusted accordingly according to the structure of the actual product; compared with the traditional auxiliary contact structure adopts a vertical structure layout, if additional auxiliary contacts are needed, the volume of the product also needs to be increased. When the volume of the contactor is limited, this will cause difficulties in adding the auxiliary contact lead-out terminal 3. The auxiliary contact structure in the solution of this application adopts a horizontal structure layout, which can reduce the impact of adding auxiliary contacts on the volume of the product.

[0050] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An auxiliary contact mechanism of a high-voltage DC contactor, comprising a housing (1), a base (2) arranged in the housing (1), and two auxiliary contact lead terminals (3), characterized in that: The housing (1) is provided with two main contacts (4) on one side close to the base (2), the base (2) is provided with a support frame (5) on one side close to the main contacts (4), the support frame (5) is provided with a movable contact piece (6) for contacting the two main contacts (4), the two auxiliary contact lead-out terminals (3) are respectively provided on the top wall of the housing (1) and their respective bottom ends extend into the cavity of the housing (1), and the bottom ends of the two auxiliary contact lead-out terminals (3) are respectively provided with a second contact. An auxiliary contact piece (7) and a second auxiliary contact piece (8); an auxiliary bracket (9) for fixing the first auxiliary contact piece (7) and the second auxiliary contact piece (8) is provided in the housing (1); a pull rod (10) for pushing the second auxiliary contact piece (8) is provided on the outer wall of the base (2); a sliding chamber (11) is formed between the support frame (5) and the base (2); a pushing component for pushing the base (2) to move in a vertical direction is provided in the sliding chamber (11); The pushing assembly includes a push rod (12) with one end disposed in the sliding chamber (11) and the other end passing through the sliding chamber (11), a compression spring (13) with one end disposed on a side of the support frame (5) close to the push rod (12) and the other end sleeved on the push rod (12), and the push rod (12) is connected to the magnetic circuit portion of the housing (1) on a side away from the base (2); The housing (1) is provided with a mounting plate (14) on a side close to the auxiliary bracket (9), the mounting plate (14) is provided with a mounting groove (15) on a side close to the auxiliary bracket (9), the mounting groove (15) is provided with a sliding hole (16) for the auxiliary bracket (9) to slide on a side facing the pull rod (10), and a fixing component for fixing the auxiliary bracket (9) is provided in the mounting groove (15); The fixing assembly comprises a limiting portion (17) provided on a side of the auxiliary bracket (9) close to the inner wall of the mounting groove (15), a limiting groove (18) provided on a side of the mounting groove (15) close to the limiting portion (17) and for the limiting portion (17) to be embedded, and an elastic block (19) provided on a side of the mounting groove (15) close to the sliding hole (16).

2. The auxiliary contact mechanism of a high-voltage DC contactor according to claim 1, characterized in that: An arc extinguishing cover (20) is provided on one side of the housing (1) close to the main contact (4), and the cover opening of the arc extinguishing cover (20) faces one side of the base (2).

3. The auxiliary contact mechanism of a high-voltage DC contactor according to claim 2, characterized in that: A fixing plate (21) is provided on a side of the arc extinguishing cover (20) close to the base (2), and a limiting hole (22) for limiting the first auxiliary contact piece (7) and the second auxiliary contact piece (8) is provided on a side of the fixing plate (21) close to the auxiliary bracket (9).

4. The auxiliary contact mechanism of a high-voltage DC contactor according to claim 1, characterized in that: A bending portion (23) is provided on the side of the first auxiliary contact piece (7) away from the contact end and on the side of the second auxiliary contact piece (8) away from the contact end.

5. The auxiliary contact mechanism of a high-voltage DC contactor according to claim 1, characterized in that: The first auxiliary contact piece (7) and the second auxiliary contact piece (8) are fixed to the auxiliary bracket (9) by injection molding.

6. The auxiliary contact mechanism of a high-voltage DC contactor according to claim 1, characterized in that: The side of the elastic block (19) away from the auxiliary bracket (9) is configured as an inclined surface.

7. The auxiliary contact mechanism of a high-voltage DC contactor according to claim 2, characterized in that: The arc extinguishing cover (20) is configured as a ceramic cover.

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