High voltage dc contactor

Abstract

This invention discloses a high-voltage DC contactor, comprising an arc-extinguishing shroud, a magnetic plate, a main contact structure, a push rod, an auxiliary moving contact structure, and a drive unit. The arc-extinguishing shroud and the magnetic plate are sealed together to form an arc-extinguishing cavity. The main contact structure has two stationary contacts partially inserted into the arc-extinguishing cavity and a moving contact piece built into the arc-extinguishing cavity. The push rod can move along its axial direction to drive the moving contact piece to engage or disengage with one end of the two stationary contacts. The auxiliary moving contact structure has an auxiliary terminal partially inserted into the arc-extinguishing cavity and an auxiliary moving spring connected to one end of the auxiliary terminal. The drive unit is connected to one end of the push rod and can move synchronously with it. When the moving contact piece separates from or engages with the stationary contacts, the drive unit can correspondingly drive the auxiliary moving spring piece to engage or disengage with the magnetic plate. The auxiliary moving contact structure, the drive unit, and the magnetic plate together constitute the auxiliary contact structure. This high-voltage DC contactor has advantages such as high reliability, high safety, good airtightness, long service life, and low processing cost.

Description

Technical Field

[0001] This invention relates to the field of contactor technology, and in particular to a high-voltage DC contactor with high reliability, high safety, good airtightness, and long service life. Background Technology

[0002] As is well known, high-voltage DC contactors typically have two sets of contact structures: one set is the main contact structure, used to control the opening and closing of the main circuit; the other set is the auxiliary contact structure, used to monitor the working status of the main contact structure.

[0003] Regarding the auxiliary contact structure, the commonly used implementation structure in the industry is as follows: it includes an auxiliary moving spring plate disposed in the arc-extinguishing cavity and fixedly connected to the push rod, and an auxiliary stationary contact plate also disposed in the arc-extinguishing cavity and cooperating with the auxiliary moving spring plate. When the push rod moves upward, it can cause the main contact structure to conduct and cause the auxiliary moving spring plate to separate from the auxiliary stationary contact plate; when the push rod moves downward, it can cause the main contact structure to disconnect and cause the auxiliary moving spring plate to contact and connect with the auxiliary stationary contact plate.

[0004] However, since both the auxiliary moving spring and the auxiliary stationary contact are located inside the arc-extinguishing chamber, two auxiliary terminals are required to lead them out and connect them to external devices (such as condition monitoring equipment, control circuit detection devices, or signal acquisition modules). This results in numerous welding points on the arc-extinguishing chamber, increasing the risk of air leakage and adversely affecting the airtightness, reliability, and safety of the high-voltage DC contactor.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] To overcome the above-mentioned defects, the present invention provides a high-voltage DC contactor, which has the advantages of simple and reasonable structure, small size, high reliability and safety, good airtightness, long service life and low processing cost, thus well meeting market demand.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: a high-voltage DC contactor, comprising an arc-extinguishing shroud, a magnetic plate, a main contact structure, a push rod, and an electromagnetic drive mechanism. The arc-extinguishing shroud and the magnetic plate are sealed and connected to form an arc-extinguishing cavity. The main contact structure has two stationary contacts partially inserted into the arc-extinguishing cavity and a moving contact piece built into the arc-extinguishing cavity and simultaneously positioned opposite one end of the two stationary contacts. One axial end of the push rod is sealed and extends into the arc-extinguishing cavity and connected to the moving contact piece. The other axial end of the push rod is connected to the electromagnetic drive mechanism located beside the outside of the arc-extinguishing cavity, and the electromagnetic drive mechanism can drive the push rod to move along its axial direction to move the moving contact piece. The device is connected to or separated from one end of the two stationary contacts; it also includes an auxiliary moving contact structure and a driving unit. The auxiliary moving contact structure has an auxiliary terminal fixed to the arc-extinguishing cover with one end inserted into the arc-extinguishing cavity and the other end sealed and extended out of the arc-extinguishing cavity, and an auxiliary moving spring connected to one end of the auxiliary terminal. The driving unit is connected to one axial end of the push rod and can move synchronously with it. When the moving contact separates from or connects with one end of the two stationary contacts, the driving unit can drive the auxiliary moving spring to contact or separate from the magnetic plate. That is, the auxiliary moving contact structure, the driving unit and the magnetic plate together constitute the auxiliary contact structure of the high-voltage DC contactor.

[0008] As a further improvement of the present invention, a support is also provided, which is made of insulating material and is fixedly sleeved on one axial end of the push rod by injection molding process; the drive part is made of the same material as the support and is integrally injection molded.

[0009] As a further improvement of the present invention, the auxiliary moving spring is provided with a sheet-shaped spring body and a contact fixedly disposed on one end of the spring body, and the other end of the spring body is fixedly connected to one end of the auxiliary terminal by welding or riveting.

[0010] As a further improvement of the present invention, the reed body is made of beryllium copper alloy material, and the contacts are made of silver material.

[0011] As a further improvement of the present invention, the axial direction of the push rod is defined as the up-down direction; the main body of the spring is flat and located below the driving part, and the lower side of the driving part is a plane or a downwardly convex arc surface.

[0012] As a further improvement of the present invention, the axial direction of the push rod is defined as the up-down direction; the spring body is provided with a curved spring pressing part, the vertical cross-sectional shape of the spring pressing part is an inverted V shape or an upward convex arc shape, the driving part is located above the spring pressing part, and the lower side of the driving part is a plane or concave arc surface that cooperates with the spring pressing part.

[0013] As a further improvement of the present invention, the axial direction of the push rod is defined as the up-down direction; the auxiliary terminal is a rod-shaped structure extending vertically, and the auxiliary terminal is sealed and fixedly connected to the arc-extinguishing cover by welding.

[0014] As a further improvement of the present invention, two lead-out terminals are provided, which are electrically connected to the other end of the auxiliary terminal and the magnetic plate by means of wire connection or contact conduction.

[0015] As a further improvement of the present invention, the support is provided with a protrusion and / or a groove on the side facing the magnetic plate to increase the creepage distance;

[0016] The support has a receiving groove on the side facing away from the magnetic plate to accommodate one end of the contact spring of the high voltage DC contactor.

[0017] As a further improvement of the present invention, the axial direction of the push rod is defined as the up-down direction; the electromagnetic drive mechanism is provided with a coil winding, a stationary iron core, a moving iron core and a return spring. The coil winding is positioned below the magnetic guide plate. The stationary iron core and the moving iron core are arranged vertically opposite each other within the space enclosed by the coil winding. The stationary iron core is fixedly connected to the magnetic guide plate, and the moving iron core is fixedly connected to the lower part of the push rod. The return spring is sleeved on the push rod and simultaneously elastically abuts against the stationary iron core and the moving iron core. When the coil winding is energized, it can drive the moving iron core and the push rod to move upward together, thereby causing the moving contact to engage with one end of the two stationary contacts and causing the auxiliary moving spring to separate from the magnetic guide plate. When the coil winding is de-energized, it can cause the moving iron core and the push rod to move downward together, thereby causing the moving contact to separate from one end of the two stationary contacts and causing the auxiliary moving spring to contact the magnetic guide plate.

[0018] The beneficial effects of this invention are as follows: Compared with the traditional high-voltage DC contactor structure, this invention achieves the following functional advantages through structural innovation of the auxiliary contact structure: ① By using the magnetic plate as an "electrode" of the auxiliary contact structure, the number of auxiliary terminals can be reduced, thereby reducing material costs and welding points on the arc extinguishing cover, significantly reducing the risk of air leakage, and improving the overall airtightness and operational reliability and safety of the high-voltage DC contactor. Furthermore, reducing the number of auxiliary terminals also helps to reduce the size of the high-voltage DC contactor, promoting the miniaturization of high-voltage DC contactor products. ② Because the magnetic plate is made of a high-permeability magnetic material, it can achieve rapid arc extinguishing; therefore, by using the magnetic plate as an "electrode" of the auxiliary contact structure, the degree of ablation during the separation process of the auxiliary moving spring from the magnetic plate can also be effectively reduced, thereby effectively extending the service life of the auxiliary contact structure and even the entire high-voltage DC contactor. ③ The auxiliary contact structure described in this invention is a normally closed contact structure. The stroke design of the moving iron core and push rod only needs to meet the working requirements of the main contact structure, which simplifies the processing difficulty of the product, reduces the installation layout requirements, and facilitates product processing and manufacturing. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the high-voltage DC contactor in the conducting state as described in Embodiment 1 of the present invention;

[0020] Figure 2 for Figure 1 A partial structural schematic diagram of the high-voltage DC contactor shown in the figure;

[0021] Figure 3 for Figure 2 A top view of a partial structure of the high-voltage DC contactor shown in the figure.

[0022] Figure 4 for Figure 3 A schematic diagram of the AA cross-sectional structure of a partial structure of the high-voltage DC contactor shown in the figure.

[0023] Figure 5 for Figure 3 A schematic diagram of the BB cross-sectional structure of a partial structure of the high-voltage DC contactor shown in the figure.

[0024] Figure 6 for Figure 5 The diagram shows the main contact structure, auxiliary contact structure, push rod, etc. assembled together and viewed from a first-person perspective.

[0025] Figure 7 for Figure 5 The diagram shows the main contact structure, auxiliary contact structure, push rod, etc. assembled together and viewed from a second perspective.

[0026] Figure 8 This is a partial cross-sectional view of the high-voltage DC contactor in the open state as described in Embodiment 1 of the present invention;

[0027] Figure 9 for Figure 8 An enlarged structural diagram of section C shown in the figure;

[0028] Figure 10 This is a partial cross-sectional view of the high-voltage DC contactor in the conducting state as described in Embodiment 2 of the present invention.

[0029] Referring to the accompanying drawings, the following explanations are provided:

[0030] 1. Arc extinguishing cover; 2. Magnetic plate; 3. Stationary contact; 4. Moving contact; 5. Push rod; 60. Auxiliary terminal; 61. Auxiliary moving spring; 610. Spring body; 611. Contact; 612. Spring pressing part; 62. Drive part; 7. Support; 8. Lead-out terminal; 9. Contact spring; 10. Coil winding; 11. Stationary iron core; 12. Moving iron core; 13. Return spring; 14. Housing. Detailed Implementation

[0031] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] Example 1:

[0033] Please see the appendix Figure 1 To be continued Figure 9As shown, this embodiment 1 provides a high-voltage DC contactor, including a housing 14 and an arc-extinguishing shroud 1, a magnetic guide plate 2, a main contact structure, a push rod 5, and an electromagnetic drive mechanism, all of which are built into the housing 14. The arc-extinguishing shroud 1 is a shroud structure made of ceramic material with an open lower side. The magnetic guide plate 2 is a plate structure made of magnetically conductive material (such as electrical pure iron, silicon steel, or permalloy). The magnetic guide plate 2 and the arc-extinguishing shroud 1 are sealed and connected together to form an arc-extinguishing cavity. The main contact structure has two stationary contacts 3 and a moving contact piece 4. The two stationary contacts 3 are respectively inserted into the arc-extinguishing cavity at one end (i.e., the lower end). The other end (i.e., the upper end) is sealed and extended outside the upper side of the arc-extinguishing cavity and fixedly mounted on the arc-extinguishing cover 1. Simultaneously, the two stationary contacts 3 are arranged side-by-side, and the upper ends of the two stationary contacts 3 extending outside the upper side of the arc-extinguishing cavity also extend outside the outer casing 14 for connection to external devices (such as terminals). The moving contact 4 is built into the arc-extinguishing cavity and is simultaneously positioned opposite one end of the two stationary contacts 3. The push rod 5 extends in the vertical direction, that is, the axis of the push rod 5 is vertical, and after the upper end of the push rod 5 is sealed and extended into the arc-extinguishing cavity, it is combined with the moving contact 4 via the support 7, the inverted U-shaped frame, and the contact spring 9. 4. Connection (this is a conventional technical method in the field of contactors): The lower end of the push rod 5 extends below the magnetic guide plate 2; the electromagnetic drive mechanism includes a coil winding 10, a stationary iron core 11, a moving iron core 12, and a return spring 13. The coil winding 10 is positioned below the magnetic guide plate 2. The stationary iron core 11 and the moving iron core 12 are arranged vertically opposite each other within the space enclosed by the coil winding 10. Simultaneously, the stationary iron core 11 is fixedly connected to the magnetic guide plate 2, and the moving iron core 12 is coaxially and fixedly connected to the lower part of the push rod 5. It can be understood that both the stationary iron core 11 and the magnetic guide plate 2 have passageways for the push rod 5 to move. The perforation is designed so that the return spring 13 is sleeved on the push rod 5 and simultaneously elastically abuts against the stationary iron core 11 and the moving iron core 12. When the coil winding 10 is energized, a magnetic circuit is formed between the magnetic plate 2, the stationary iron core 11, and the moving iron core 12, generating a magnetic attraction between the stationary iron core 11 and the moving iron core 12. This magnetic attraction drives the moving iron core 12, along with the push rod 5, to move upwards, thereby causing the moving contact 4 to engage with one end of the two stationary contacts 3 and compressing the return spring 13. At this time, the high-voltage DC contactor is in the conducting state (see Appendix for details). Figure 4 and attached Figure 5(As shown); when the coil winding 10 is de-energized, the moving iron core 12 and the push rod 5 can move downward together under their own weight and the elastic restoring force provided by the return spring 13, thereby causing the moving contact 4 to separate from one end of the two stationary contacts 3. At this time, the high-voltage DC contactor is in the open state (see Appendix for details). Figure 8 (As shown).

[0034] To improve the reliability and safety of the high-voltage DC contactor during operation, as well as its airtightness and service life, this embodiment 1 makes the following structural improvements and innovations to the high-voltage DC contactor: Please refer to the appendix. Figure 5 To be continued Figure 9 As shown, this high-voltage DC contactor structure is also equipped with an auxiliary moving contact structure and a drive unit 62. The auxiliary moving contact structure has an auxiliary terminal 60 fixedly mounted on the arc-extinguishing cover 1 with its lower end inserted into the arc-extinguishing cavity and its upper end sealed and extended out of the arc-extinguishing cavity, and an auxiliary moving spring 61 connected to the lower end of the auxiliary terminal 60. The drive unit 62 is connected to the upper end of the push rod 5 and can move synchronously with it. When the push rod 5 moves downward to cause the moving contact 4 to separate from one end of the two stationary contacts 3, the push rod 5 can also synchronously drive the drive unit 62 to move downward, thereby driving the auxiliary moving spring 61 to contact and communicate with the magnetic plate 2 (see Appendix for details). Figure 8 and attached Figure 9 (As shown); when the push rod 5 moves upward to cause the moving contact 4 to engage with one end of the two stationary contacts 3, the push rod 5 can simultaneously drive the driving part 62 to move upward, thereby separating the auxiliary moving spring 61 from the magnetic plate 2 (see attached diagram for details). Figure 5 To be continued Figure 7 (As shown). It can be understood that in this embodiment 1, the auxiliary moving contact structure, the driving part 62, and the magnetic plate 2 together constitute the auxiliary contact structure of the high-voltage DC contactor. The auxiliary contact structure can reflect the on / off state of the main contact structure, and the on / off state of the auxiliary contact structure is opposite to that of the main contact structure. Further, it can be understood that, based on the auxiliary contact structure, the auxiliary terminal 60 and the magnetic plate 2 can be led out via leads or lead-out terminals and connected to external devices (such as: status monitoring equipment, control circuit detection devices, or signal acquisition modules, etc.).

[0035] As can be seen from the above, compared with the traditional high-voltage DC contactor structure, this embodiment achieves the following functional advantages through structural innovation of the auxiliary contact structure: ① By using the magnetic plate 2 as an "electrode" of the auxiliary contact structure, the number of auxiliary terminals 60 can be reduced, thereby reducing material costs (due to the saving of an auxiliary terminal and solder) and reducing the number of welding points on the arc extinguishing cover 1 (due to the saving of an auxiliary terminal), thus significantly reducing the risk of air leakage and improving the overall airtightness and reliability and safety of the high-voltage DC contactor during operation. In addition, reducing the number of auxiliary terminals 60 also helps to reduce the size of the high-voltage DC contactor, promoting the miniaturization of high-voltage DC contactor products. ② Because the magnetic plate 2 is made of a high-permeability magnetic material, it can achieve rapid arc extinguishing; therefore, by using the magnetic plate 2 as an "electrode" of the auxiliary contact structure, the degree of ablation during the separation process of the auxiliary moving spring 61 and the magnetic plate 2 can also be effectively reduced, thereby effectively extending the service life of the auxiliary contact structure and even the entire high-voltage DC contactor. ③ The auxiliary contact structure described in this embodiment is a normally closed contact structure. The stroke design of the moving iron core 12 and the push rod 5 only needs to meet the working requirements of the main contact structure, which simplifies the processing difficulty of the product, reduces the installation layout requirements, and facilitates product processing and manufacturing.

[0036] Additional explanation: In conventional applications of high-voltage DC contactors, the current flowing through the auxiliary contact structure is typically small. Industry standards specify a minimum load current of 100mA (at 24V), and in some special scenarios, it can be as low as 2mA (at 15V DC). Therefore, the conductivity of the magnetic plate 2 can well meet the operational requirements of the auxiliary contact structure.

[0037] The following provides a detailed description of the specific structure of the high-voltage DC contactor provided in this embodiment, particularly the specific structure of the auxiliary contact structure.

[0038] Please continue to refer to the appendix. Figure 5 To be continued Figure 9 As shown, in this embodiment, the auxiliary terminal 60 is a rod extending vertically, and the upper end of the auxiliary terminal 60 is sealed and fixedly connected to the upper side of the arc-extinguishing cover 1 by welding. The auxiliary moving spring 61 has a flat spring body 610 and a contact 611 fixedly disposed on one end of the spring body 610, and the other end of the spring body 610 is fixedly connected to the lower end of the auxiliary terminal 60 by welding or riveting.

[0039] Furthermore, the auxiliary terminal 60 is made of Kovar alloy material. On the one hand, the coefficient of thermal expansion of Kovar alloy material is very close to and matched with that of ceramic and other packaging materials. This matching can ensure that the auxiliary terminal 60 expands / contracts synchronously with the arc extinguishing cover 1, thereby significantly improving the airtight performance of the product. On the other hand, Kovar alloy material has high magnetic permeability and moderate conductivity, which can ensure the purity of signal transmission.

[0040] The reed body 610 is made of beryllium copper alloy, and the contact 611 is made of silver. On one hand, beryllium copper alloy has extremely high elastic limit and good resilience, maintaining stable elastic performance during frequent bending or extension movements, thus ensuring the overall reliability of the contact / disconnection operation of the auxiliary moving reed 61. On the other hand, beryllium copper alloy has good electrical conductivity, and silver has excellent electrical conductivity; the combination of these two properties effectively meets the conductivity requirements of the auxiliary contact structure.

[0041] In addition, the number of contacts 611 can be configured as one or two according to product design requirements, and this embodiment does not impose any restrictions.

[0042] Please continue to refer to the appendix. Figure 5 To be continued Figure 9 As shown, in this embodiment, the support 7 is made of insulating material and is fixedly sleeved on the upper end of the push rod 5 by injection molding process. The drive part 62 is made of the same material as the support 7 and is integrally injection molded.

[0043] Furthermore, the driving part 62 is located above the spring body 610 and can press downward against the spring body 610 or disengage from the spring body 610 under the action of the push rod 5. Further, the lower side of the driving part 62 is a flat surface or a downwardly convex arc surface to ensure good contact with the spring body 610.

[0044] Furthermore, regarding the support 7, this embodiment also makes the following structural improvements: the support 7 has a protrusion and / or groove on the side facing the magnetic plate 2 to increase the creepage distance; the support 7 has a receiving groove on the side facing away from the magnetic plate 2 to receive one end of the contact spring 9 of the high voltage DC contactor.

[0045] Please continue to refer to the appendix. Figure 2 and attached Figure 5As shown, in this embodiment, two lead-out terminals 8 are also provided. One lead-out terminal 8 is electrically connected to the upper end of the auxiliary terminal 60 via a wire connection, and the other lead-out terminal 8 is electrically connected to the side or lower surface of the magnetic plate 2 via a contact connection. It can be understood that: ① the two lead-out terminals 8 are used to lead out the auxiliary terminal 60 and the magnetic plate 2 and connect them to external devices (such as: status monitoring equipment, control loop detection devices, or signal acquisition modules, etc.). ② Both lead-out terminals 8 are fixed to the housing 14.

[0046] In summary, the high-voltage DC contactor provided in this embodiment 1 has the advantages of simple and reasonable structure, small size, high reliability and safety, good airtightness, long service life and low processing cost, which well meet the market demand.

[0047] Example 2:

[0048] This embodiment 2 also provides a high-voltage DC contactor, and compared with embodiment 1, the high-voltage DC contactor provided in this embodiment 2 has the following structural differences: ① The structure of the reed body 610 is different from that in embodiment 1.

[0049] For details, please refer to the appendix. Figure 10 As shown, in the high-voltage DC contactor structure provided in this embodiment 2, the spring body 610 is provided with a curved spring pressing part 612, which is used to abut and cooperate with the drive part 62.

[0050] Furthermore, the axial direction of the push rod 5 is defined as vertical, the vertical cross-sectional shape of the spring-loaded part 612 is an inverted V-shape or an upwardly convex arc, and the driving part 62 is located above the spring-loaded part 612, and can press downward against the spring-loaded part 612 or disengage from the spring-loaded part 612 under the drive of the push rod 5. Furthermore, the lower side of the driving part 62 is a plane or concave arc surface that mates with the spring-loaded part 612, ensuring good contact with the spring-loaded part 612. It is understood that by providing the spring-loaded part 612 on the spring body 610, the auxiliary moving spring 61 as a whole can have good rebound performance, further improving the reliability of the overall contact / disconnection action of the auxiliary moving spring 61.

[0051] Apart from the difference ① mentioned above, other structures in the high-voltage DC contactor structure provided in this embodiment 2, such as the outer shell 14, the arc extinguishing cover 1, the magnetic plate 2, the main contact structure, the push rod 5, the electromagnetic drive mechanism, the auxiliary terminal 60, the contact 611, the drive part 62, etc., can all adopt the same technical means as in the above embodiment 1, so they will not be described in detail here.

[0052] As can be seen from the above, the high-voltage DC contactor provided in this embodiment 2 also has the advantages of simple and reasonable structure, small size, high reliability and safety, good airtightness, long service life and low processing cost, which well meet the market demand.

[0053] Many specific details have been set forth in the foregoing description to provide a thorough understanding of the present invention. However, the above description is merely a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A high-voltage direct-current contactor comprising an arc-extinguishing cover (1), a magnetic conductive plate (2), a main contact structure, a push rod (5) and an electromagnetic driving mechanism, the arc-extinguishing cover (1) and the magnetic conductive plate (2) are sealingly and symmetrically connected to form an arc-extinguishing chamber, the main contact structure is provided with two static contacts (3) partially inserted into the arc-extinguishing chamber and a movable contact (4) embedded in the arc-extinguishing chamber and arranged opposite to one end of the two static contacts (3), one end of the push rod (5) is sealingly extended into the arc-extinguishing chamber and connected with the movable contact (4), the other end of the push rod (5) is connected with the electromagnetic driving mechanism arranged beside the outside of the arc-extinguishing chamber, and the electromagnetic driving mechanism can drive the push rod (5) to move along its axial direction to drive the movable contact (4) to be in communication or separated from one end of the two static contacts (3); characterized in that: The auxiliary moving contact structure is provided with an auxiliary terminal (60) fixedly arranged on the arc extinguishing cover (1) in a manner that one end is inserted into the arc extinguishing chamber and the other end is sealed and extends out of the arc extinguishing chamber, and an auxiliary moving spring piece (61) connected to one end of the auxiliary terminal (60); the driving part (62) is connected to one axial end of the push rod (5) and can move synchronously with the push rod (5), and when the moving contact piece (4) is separated from or in close contact with one end of the two static contact heads (3), the driving part (62) can drive the auxiliary moving spring piece (61) to be in contact with or separated from the magnetic conductive plate (2), that is, the auxiliary moving contact structure, the driving part (62) and the magnetic conductive plate (2) together form an auxiliary contact head structure of the high-voltage DC contactor.

2. The high-voltage DC contactor of claim 1, wherein: The support (7) is made of insulating material and is fixedly sleeved on one axial end of the push rod (5) through an injection molding process; The driving part (62) is made of the same material as the support (7) and is integrally injection molded.

3. The HVDC contactor of claim 1, wherein: The auxiliary moving spring piece (61) is provided with a spring piece body (610) in the shape of a sheet and a contact point (611) fixedly arranged on one end of the spring piece body (610), and the other end of the spring piece body (610) is fixedly connected to one end of the auxiliary terminal (60) through welding or riveting.

4. The HVDC contactor of claim 3, wherein: The spring piece body (610) is made of beryllium copper alloy material, and the contact point (611) is made of silver material.

5. The HVDC contactor of claim 3, wherein: The axial direction of the push rod (5) is defined as the up-down direction; the spring piece body (610) is flat and located below the driving part (62), and the lower side of the driving part (62) is a plane or an arc surface protruding downward.

6. The HVDC contactor of claim 3, wherein: The axial direction of the push rod (5) is defined as the up-down direction; the spring piece body (610) is provided with a curved elastic pressing part (612), the vertical cross-sectional shape of the elastic pressing part (612) is inverted V-shaped or upwardly convex arc-shaped, the driving part (62) is located above the elastic pressing part (612), and the lower side of the driving part (62) is a plane or a concave arc surface matched with the elastic pressing part (612).

7. The HVDC contactor of claim 1, wherein: The axial direction of the push rod (5) is defined as the up-down direction; the auxiliary terminal (60) is a rod-shaped structure extending in the vertical direction, and the auxiliary terminal (60) is fixedly and sealingly connected to the arc extinguishing cover (1) through welding.

8. The HVDC contactor of claim 1, wherein: Two lead terminals (8) are electrically connected to the other end of the auxiliary terminal (60) and the magnetic conductive plate (2) through lead connection or contact conduction.

9. The HVDC contactor of claim 2, wherein: The side of the support (7) facing the magnetic conductive plate (2) is provided with a protrusion and / or a groove to increase the creepage distance; The side of the support (7) away from the magnetic conductive plate (2) is provided with a receiving groove for receiving one end of a contact spring (9) of the high-voltage DC contactor.

10. The HVDC contactor of claim 1, wherein: The axial direction of the push rod (5) is defined as the up-down direction; The electromagnetic driving mechanism is provided with a coil winding (10), a static iron core (11), a dynamic iron core (12) and a reset spring (13), the coil winding (10) is positioned and arranged below the magnetic conducting plate (2), the static iron core (11) and the dynamic iron core (12) are arranged oppositely in the space surrounded by the coil winding (10) in an up-down mode, the static iron core (11) is fixedly connected with the magnetic conducting plate (2), the dynamic iron core (12) is fixedly connected with the lower part of the push rod (5), the reset spring (13) is sleeved on the push rod (5) and elastically abuts between the static iron core (11) and the dynamic iron core (12); when the coil winding (10) is electrified, the dynamic iron core (12) and the push rod (5) can be driven to move upward, thereby driving the dynamic contact piece (4) to be in communication with one end of the two static contact heads (3) and driving the auxiliary dynamic spring piece (61) to be separated from the magnetic conducting plate (2); when the coil winding (10) is de-energized, the dynamic iron core (12) and the push rod (5) can be driven to move downward, thereby driving the dynamic contact piece (4) to be separated from one end of the two static contact heads (3) and driving the auxiliary dynamic spring piece (61) to be in communication with the magnetic conducting plate (2).

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