High voltage dc contactor

Abstract

The application discloses a high-voltage direct-current contactor, which comprises an arc-extinguishing chamber formed by an arc-extinguishing cover and a magnetic conductive plate, two static contacts partially arranged in the arc-extinguishing chamber, a moving contact piece arranged in the arc-extinguishing chamber, a push rod and an electromagnetic driving mechanism, one end of the push rod is connected with the electromagnetic driving mechanism, the other end of the push rod is connected with the moving contact piece, the push rod can move along the axial direction to drive the moving contact piece to be attracted to the two static contacts or to be separated from the two static contacts, four corners of the arc-extinguishing chamber are respectively provided with arc-extinguishing assemblies, each arc-extinguishing assembly is respectively provided with a plurality of arc-extinguishing fins and a plurality of arc striking pieces which are alternately arranged along a first direction, the arc striking pieces can be magnetized by a magnetic field generated by arc current to generate a magnetic field force for pulling the arc into the arc-extinguishing assembly, and the plurality of arc-extinguishing fins and the plurality of arc striking pieces are misaligned at one end of the same side and together form a stepped structure which can force the arc to be bent and elongated. The high-voltage direct-current contactor has the advantages of small size, high arc-extinguishing efficiency and good arc-extinguishing effect, and meets the market demand.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of contactor, in particular to a high-voltage DC contactor with good arc extinguishing effect and small size. BACKGROUND

[0002] It is known that in the existing high-voltage DC contactor structure, by filling inert gas into the inside of the DC contactor and setting magnetic steel at both ends of the two static contact head wires, the arc extinguishing time can be effectively shortened, the risk of contact ablation can be reduced, and the safe and stable operation of the high-voltage DC system can be ensured.

[0003] However, as the voltage platform becomes higher and higher and the current becomes larger and larger, the above-mentioned arc extinguishing method is more and more difficult to meet the needs of application scenarios. In order to improve the arc extinguishing effect, the current industry generally adopts the method of increasing the magnetic steel, but increasing the magnetic steel will inevitably cause the product size of the contactor to increase, which is contrary to the trend of product miniaturization. In view of this, the present application is proposed. SUMMARY

[0004] In order to overcome the above-mentioned defects, the present application provides a high-voltage DC contactor, which has the advantages of simple and reasonable structure, small size, high arc extinguishing efficiency and good arc extinguishing effect, and well meets the market demand.

[0005] The technical scheme adopted by the present application to solve its technical problems is: a high-voltage DC contactor, comprising an arc extinguishing cover, a magnetic conducting plate, two static contact heads, a moving contact piece, a push rod and an electromagnetic driving mechanism, the arc extinguishing cover and the magnetic conducting plate are sealingly and oppositely connected to form an arc extinguishing cavity, the two static contact heads are fixedly arranged on the arc extinguishing cover in a manner that one end is inserted into the arc extinguishing cavity and the other end is stretched out of the arc extinguishing cavity, the moving contact piece is movably arranged in the arc extinguishing cavity and is oppositely arranged with one end of the two static contact heads, the axial one end of the push rod is connected with the electromagnetic driving mechanism arranged beside the outside of the arc extinguishing cavity, and the axial other end of the push rod is movably and sealingly inserted into the arc extinguishing cavity and connected with the moving contact piece; the electromagnetic driving mechanism can drive the push rod to move along its axial direction to drive the moving contact piece to be attracted to and communicated with or separated from one end of the two static contact heads; arc extinguishing assemblies are arranged at four corner positions inside the arc extinguishing cavity, each arc extinguishing assembly is provided with a plurality of arc extinguishing fins made of the same material as the arc extinguishing cover and a plurality of arc striking pieces made of magnetic conducting material, the plurality of arc extinguishing fins and the plurality of arc striking pieces are alternately arranged in a first direction parallel to the axial direction of the push rod, and the plurality of arc striking pieces can be magnetized by the magnetic field generated by the arc current to generate a magnetic field force capable of pulling the arc into the arc extinguishing assembly; in addition, the plurality of arc extinguishing fins and the plurality of arc striking pieces at one end of the same side are not aligned and together form a stepped structure capable of forcing the arc to bend and be elongated.

[0006] As a further improvement of the present application, the arc extinguishing grid is made of ceramic material, and the arc leading member is made of iron.

[0007] As a further improvement of the present application, the first direction is defined as the up-down direction; in each arc extinguishing assembly, the plurality of arc extinguishing grids and the plurality of arc leading members are alternately arranged from top to bottom on the inner wall of the arc extinguishing cover.

[0008] As a further improvement of the present application, in each arc extinguishing assembly, the plurality of arc extinguishing grids are respectively integrally connected with the inner wall of the arc extinguishing cover, and the plurality of arc leading members are respectively clamped on the inner wall of the arc extinguishing cover.

[0009] As a further improvement of the present application, in each arc extinguishing assembly, the plurality of arc extinguishing grids and the plurality of arc leading members are both L-shaped pieces placed horizontally, i.e., each arc extinguishing grid is provided with a first section extending along a second direction and a second section extending along a third direction, and each arc leading member is provided with a section A extending along the second direction and a section B extending along the third direction; the first direction, the second direction and the third direction are perpendicular to each other.

[0010] In addition, one end of the plurality of first sections and the plurality of section A on the same side are misaligned and together constitute the step structure, and / or one end of the plurality of second sections and the plurality of section B on the same side are misaligned and together constitute the step structure.

[0011] As a further improvement of the present application, the two stationary contacts are arranged side by side, and the side-by-side direction of the two stationary contacts is parallel to the third direction.

[0012] In each arc extinguishing assembly, one end of any section A away from the corresponding section B exceeds one end of any first section away from the corresponding second section.

[0013] As a further improvement of the present application, the four groups of arc extinguishing assemblies are symmetrically arranged relative to the arc extinguishing cover along a center line parallel to the direction of the line connecting the two stationary contacts.

[0014] As a further improvement of the present application, in each arc extinguishing assembly, a surface treatment layer is provided on the surface of each arc leading member.

[0015] As a further improvement of the present application, the arc extinguishing cavity is filled with nitrogen, hydrogen or a mixture of the two.

[0016] As a further improvement of the present application, the high-voltage DC contactor is further provided with a magnetic steel, and the magnetic steel is configured as at least two and symmetrically arranged outside the arc extinguishing cover on both sides along the direction of the line connecting the two stationary contacts.

[0017] The beneficial effects of this invention are as follows: Compared with traditional high-voltage DC contactors, this invention innovates the structure of the arc-extinguishing assembly by using "multiple arc-extinguishing grid plates of the same material as the arc-extinguishing cover and multiple arc-initiating elements made of magnetically conductive material to form the arc-extinguishing assembly," and designs the multiple arc-extinguishing grid plates and multiple arc-initiating elements to form a stepped structure on one side. This significantly improves the arc-extinguishing efficiency and arc-extinguishing effect of the contactor product without adding extra parts or increasing the product volume, thus well meeting the market demand for contactor products. In addition, the high-voltage DC contactor provided by this invention has a simple and reasonable overall structure, small size, is easy to process and manufacture, and has low manufacturing cost, which is conducive to production implementation. Attached Figure Description

[0018] Figure 1 This is a cross-sectional structural diagram of the high-voltage DC contactor of the present invention in the open state;

[0019] Figure 2 This is a three-dimensional structural diagram of the arc-extinguishing cavity in the high-voltage DC contactor described in this invention;

[0020] Figure 3 for Figure 2 A top view of the arc-extinguishing cavity shown in the diagram;

[0021] Figure 4 for Figure 3 A schematic diagram of the AA cross-sectional structure of the arc-extinguishing cavity shown in the figure;

[0022] Figure 5 for Figure 3 A schematic diagram of the BB cross-sectional structure of the arc-extinguishing cavity shown in the figure;

[0023] Figure 6 for Figure 2 A schematic diagram of the arc-extinguishing shield shown in the figure;

[0024] Figure 7 for Figure 6 An enlarged structural diagram of section C shown in the figure.

[0025] Referring to the accompanying drawings, the following explanations are provided:

[0026] 1. Arc-extinguishing cover; 2. Magnetic guide plate; 3. Stationary contact; 4. Moving contact piece; 5. Push rod; 6. Arc-extinguishing assembly; 61. Arc-extinguishing grid; 611. First section; 612. Second section; 613. Arc-shaped section; 62. Arc-initiating component; 620. Section A; 621. Section B; 622. Arc-shaped section A; 7. Magnet; 80. Coil winding; 81. Yoke; 82. Moving iron core; 83. Stationary iron core; 84. Return spring; 9. Outer shell. Detailed Implementation

[0027] The preferred embodiments of the present application are described in detail below with reference to the accompanying drawings. Embodiments

[0028] Please refer to the accompanying drawings Figure 1 to the accompanying drawings Figure 7 The present embodiment provides a high-voltage DC contactor, which comprises a housing 9, and an arc-extinguishing cover 1, a magnetic conductive plate 2, two static contacts 3, a moving contact 4, a push rod 5 and an electromagnetic driving mechanism which are all arranged in the housing 9 respectively. The arc-extinguishing cover 1 is a cover structure with an open bottom (further, a rectangular cover structure with an open bottom). The magnetic conductive plate 2 is sealingly and tightly connected with the arc-extinguishing cover 1 to form an arc-extinguishing cavity together. The two static contacts 3 are fixed on the arc-extinguishing cover 1 in a manner that one end of each of the two static contacts 3 is arranged in the arc-extinguishing cavity and the other end of each of the two static contacts 3 extends out of the arc-extinguishing cavity. The two static contacts 3 are arranged side by side. The other end of each of the two static contacts 3 extends out of the housing 9 to be connected with external devices (such as a terminal, etc.). The moving contact 4 is movably arranged in the arc-extinguishing cavity and is arranged opposite to one end of each of the two static contacts 3. It can be understood that the two static contacts 3 and the moving contact 4 form a main contact structure of the high-voltage DC contactor. The electromagnetic driving mechanism is provided with a coil winding 80 which is arranged below the magnetic conductive plate 2 through a yoke 81, a moving iron core 82 which is movably arranged in a space formed by the coil winding 80, a static iron core 83 which is fixedly connected with the magnetic conductive plate 2 and is located above the moving iron core 82, and a reset spring 84 which is elastically arranged between the static iron core 83 and the moving iron core 82. The push rod 5 extends vertically. An axial end (i.e. a lower end) of the push rod 5 is coaxial with and fixedly connected with the moving iron core 82 (a conventional threaded connection can be used). An axial other end (i.e. an upper end) of the push rod 5 is movably and sealingly arranged in the arc-extinguishing cavity, is connected with the moving contact 4 through a support, an inverted U-shaped frame and a contact spring (which is a conventional technical means in the field of contactors), and the reset spring 84 is sleeved on the push rod 5. When the coil winding 80 is energized, a magnetic circuit is formed between the yoke 81, the magnetic conductive plate 2, the static iron core 83 and the moving iron core 82, so that a magnetic attraction force is generated between the static iron core 83 and the moving iron core 82. The magnetic attraction force can drive the moving iron core 82 and the push rod 5 to move upward (at this time, the reset spring 84 is compressed), thereby driving the moving contact 4 to be attracted to and communicated with one end of each of the two static contacts 3. At this time, the high-voltage DC contactor is in a conducting state. When the coil winding 80 is de-energized, the moving iron core 82 and the push rod 5 can move downward under the action of their own gravity and the elastic reset force provided by the reset spring 84, thereby driving the moving contact 4 to be separated from one end of each of the two static contacts 3. At this time, the high-voltage DC contactor is in a non-conducting state (see FIG. 2). Figure 1 .

[0029] In order to make the high-voltage direct-current contactor realize significant improvement of arc extinguishing effect of the contactor product without increasing the volume and meeting the product miniaturization development trend, the structure of the high-voltage direct-current contactor is further improved and innovated as follows in the embodiment. Figure 1 to Fig. Figure 7 As shown in the drawings, the arc extinguishing assembly 6 is provided at each of the four corners inside the arc extinguishing chamber, each of the arc extinguishing assembly 6 is provided with a plurality of arc extinguishing vanes 61 made of the same material as the arc extinguishing cover 1 and a plurality of arc drawing pieces 62 made of magnetic conductive material, the plurality of arc extinguishing vanes 61 and the plurality of arc drawing pieces 62 are alternately arranged along a first direction axially parallel to the push rod 5, that is, the first direction is the up-down direction, the plurality of arc extinguishing vanes 61 and the plurality of arc drawing pieces 62 are alternately arranged from top to bottom, and the plurality of arc drawing pieces 62 can be magnetized by the magnetic field generated by the arc current to generate a magnetic field force that can draw the arc into the arc extinguishing assembly 6. As can be understood, the plurality of arc drawing pieces 62 are magnetized by the magnetic field generated by the arc current to generate a magnetic field force, which can quickly draw the arc into the plurality of arc extinguishing vanes 61 and the gap formed by any two adjacent arc extinguishing vanes 61, and the plurality of arc extinguishing vanes 61 can divide the arc entering the vanes and the gap into several short arcs, each short arc forms an independent cathode voltage drop and anode voltage drop between two adjacent arc extinguishing vanes 61, and the cathode voltage drop and anode voltage drop formed by the several short arcs significantly increase the total voltage drop of the arc, so that the arc entering the arc extinguishing assembly 6 is difficult to maintain and quickly extinguished. As can be further understood, the combination of the plurality of arc extinguishing vanes 61 and the plurality of arc drawing pieces 62 can achieve higher arc extinguishing efficiency and better arc extinguishing effect.

[0030] In addition, based on the above-mentioned arc extinguishing assembly 6 provided by the embodiment, the end of the plurality of arc extinguishing vanes 61 and the plurality of arc drawing pieces 62 on the same side is designed to be misaligned, that is, the end of the plurality of arc extinguishing vanes 61 and the plurality of arc drawing pieces 62 on the same side together forms a stepped structure, which can be specifically referred to in Fig. Figure 5 to Fig. Figure 7 As can be understood, when the magnetic field force generated by the arc drawing piece 62 draws the arc into the arc extinguishing assembly 6, the "notch" formed by the stepped structure can force the arc to bend and be elongated, that is, effectively increase the arc energy dissipation and weaken the arc intensity, and further improve the arc extinguishing effect.

[0031] From the above, compared with the traditional high-voltage DC contactor, the application makes structural innovation to the arc extinguishing assembly: adopts "a plurality of arc extinguishing grid pieces 61 made of the same material as the arc extinguishing cover 1 and a plurality of arc striking pieces 62 made of magnetic conductive material to form the arc extinguishing assembly", and designs to make a plurality of the arc extinguishing grid pieces 61 and a plurality of the arc striking pieces 62 located at one end of the same side together constitute a stepped structure; can realize that without additional parts and without increasing the volume of the product, the arc extinguishing efficiency and effect are significantly improved, which well meets the market demand of the contactor product.

[0032] The specific structure of the high-voltage DC contactor provided by the embodiment, especially the specific structure of the arc extinguishing assembly 6, is described in detail below.

[0033] In the embodiment, the arc extinguishing cover 1 and the arc extinguishing grid piece 61 are preferably made of ceramic material, and the arc striking piece 62 is preferably made of iron material. It can be understood that ① the ceramic material is resistant to high temperature and has good insulation, when the arc enters the arc extinguishing grid piece 61, the arc heat can be quickly absorbed and dissipated, thereby reducing the arc temperature, accelerating the deionization process, and inhibiting the arc reignition; ② the ceramic material is not easy to deform or conduct electricity at high temperature, which can keep the structure of the arc extinguishing grid piece 61 intact, prevent the arc from penetrating or short-circuiting, and ensure the continuous and effective arc splitting and cooling process. ③ The iron material is a magnetic conductive material, which is easy to be magnetized under the action of the magnetic field generated by the arc current, and quickly generates significant magnetic field force, which quickly pulls the arc into the arc extinguishing grid piece 61.

[0034] In the embodiment, a plurality of the arc extinguishing grid pieces 61 and a plurality of the arc striking pieces 62 in each of the arc extinguishing assemblies 6 are alternately arranged on the inner wall of the arc extinguishing cover 1 from top to bottom. Further, a plurality of the arc extinguishing grid pieces 61 are respectively integrally connected with the inner wall of the arc extinguishing cover 1, and a plurality of the arc striking pieces 62 are respectively clamped on the inner wall of the arc extinguishing cover 1. It can be understood that, in order to realize the clamping of the arc striking piece 62 on the inner wall of the arc extinguishing cover 1, the embodiment is provided with a conformal clamping groove on the inner wall of the arc extinguishing cover 1, which is matched with the shape of the arc striking piece 62, and the arc striking piece 62 is positioned and clamped (or understood as inserted) in the conformal clamping groove.

[0035] In the embodiment, the plurality of arc extinguishing grid pieces 61 and the plurality of arc striking pieces 62 in each of the arc extinguishing assemblies 6 are L-shaped pieces placed horizontally, specifically, please continue to refer to the drawings of Figure 4 , the drawings of Figure 5 and the drawings of Figure 7As shown, each of the arc extinguishing grid plates 61 is provided with a first section 611 extending in a second direction, a second section 612 extending in a third direction, and an arc-shaped section 613 smoothly connecting between the first section 611 and the second section 612, and each of the arc leading pieces 62 is provided with a section A 620 extending in the second direction, a section B 621 extending in the third direction, and an arc-shaped section A 622 smoothly connecting between the section A 620 and the section B 621, wherein the first direction, the second direction and the third direction are perpendicular to each other, and the third direction is also parallel to the side-by-side direction of the two static contacts 3. In addition, in each of the arc extinguishing assemblies 6, the ends of the first sections 611 and the ends of the sections A 620 on the same side are misaligned and together form the step structure, and / or the ends of the second sections 612 and the ends of the sections B 621 on the same side are misaligned and together form the step structure.

[0036] Further, the arc extinguishing cover 1 is provided with at least two magnetic steels 7 arranged symmetrically on the two sides of the arc extinguishing cover 1 along the connecting direction of the two static contacts 3, which can refer to FIG. 2 and FIG. 3 for details. Figure 4 and the arc extinguishing cover 1 is provided with at least two magnetic steels 7 arranged symmetrically on the two sides of the arc extinguishing cover 1 along the connecting direction of the two static contacts 3, which can refer to FIG. 2 and FIG. 3 for details. Figure 5 As shown in FIG. 2 and FIG. 3, in each of the arc extinguishing assemblies 6, the end of any section A 620 away from the corresponding section B 621 exceeds the end of any first section 611 away from the corresponding second section 612, and the end of any section B 621 away from the corresponding section A 620 is aligned with / flush with the end of any second section 612 away from the corresponding first section 611. However, it is understood that the application is not limited to the above structural design in the application and implementation, and the specific design is determined according to the product design requirements.

[0037] Further, in each of the arc extinguishing assemblies 6, a surface treatment layer is arranged on the surface of the arc leading pieces 62, and the surface treatment layer can be, but is not limited to, a combination of a copper plating layer and a nickel plating layer. It is understood that by plating a copper plating layer and a nickel plating layer on the surface of the arc leading pieces 62, the heat conduction performance and rust prevention ability of the arc leading pieces 62 can be effectively improved, which helps to quickly conduct and dissipate arc heat, reduce arc temperature, speed up the deionization process, and further suppress arc reignition.

[0038] Further, in the embodiment, the arc extinguishing cover 1 has a center line parallel to the connecting direction of the two static contacts 3, and the four groups of arc extinguishing assemblies 6 are symmetrically arranged relative to the arc extinguishing cover 1 along the center line parallel to the connecting direction of the two static contacts 3.

[0039] In addition, in the embodiment, in order to improve the arc extinguishing effect of the high-voltage direct-current contactor, at least two magnetic steels 7 are symmetrically arranged on the two sides of the arc extinguishing cover 1 along the connecting direction of the two static contacts 3, which can refer to FIG. 2 and FIG. 3 for details. Figure 1It is understood that ① nitrogen is an inert gas, which can effectively isolate air and prevent the contact from being oxidized, and the presence of nitrogen also helps to extinguish the arc; in addition, nitrogen has good heat dissipation performance, which can help to reduce the temperature in the arc chamber, thereby effectively improving the working reliability and service life of the contactor; ② hydrogen has excellent thermal conductivity (i.e. high thermal conductivity), which can quickly conduct the heat generated by the arc away, improving the heat dissipation effect; and hydrogen will decompose under the action of the arc and absorb a large amount of heat, further reducing the arc temperature, which helps to extinguish the arc; ③ when nitrogen and hydrogen are filled in the arc chamber, the mixing ratio of the two gases is not limited, which is determined according to the product design requirements, for example, the hydrogen and nitrogen can be mixed according to the volume ratio of 4:1 to achieve better arc extinguishing effect.

[0040] Finally, it should be pointed out that the "first", "second" and the like in the name of the components in this specification (such as the first section, the second section, etc.), and the "A", "B" and the like in the name of the components (such as section A, section B, etc.) are only for the convenience of description and are not intended to limit the scope of the present application.

[0041] In summary, the high-voltage DC contactor provided by the present application has the advantages of simple and reasonable structure, small size, high arc extinguishing efficiency and good arc extinguishing effect, which can well meet the market demand.

[0042] In the above description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the above description is only a preferred embodiment of the present application, and the present application can be implemented in many other ways different from those described herein, therefore the present application is not limited by the specific embodiments disclosed above. Meanwhile, any person skilled in the art can make many possible changes and modifications to the technical solutions disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of the present application. Any simple modification, equivalent change and modification made to the above embodiments in accordance with the technical essence of the present application, without departing from the scope of the technical solutions of the present application, shall still fall within the scope of protection of the present application.

Claims

1. A high-voltage DC contactor comprising an arc-extinguishing cover (1), a magnetic conducting plate (2), two static contacts (3), a moving contact (4), a push rod (5) and an electromagnetic driving mechanism, the arc-extinguishing cover (1) is sealingly and symmetrically connected with the magnetic conducting plate (2) to form an arc-extinguishing chamber, the two static contacts (3) are fixed on the arc-extinguishing cover (1) in a manner that one end is inserted into the arc-extinguishing chamber and the other end is extended out of the arc-extinguishing chamber, the moving contact (4) is movably and sealingly inserted into the arc-extinguishing chamber and is arranged opposite to one end of the two static contacts (3), one end of the push rod (5) is connected with the electromagnetic driving mechanism arranged beside the arc-extinguishing chamber, the other end of the push rod (5) is movably and sealingly inserted into the arc-extinguishing chamber and is connected with the moving contact (4), the electromagnetic driving mechanism can drive the push rod (5) to move along its axial direction to drive the moving contact (4) to be in communication or separated from one end of the two static contacts (3); characterized in that: Each of the arc extinguishing assemblies (6) is provided with a plurality of arc extinguishing fins (61) made of the same material as the arc extinguishing cover (1) and a plurality of arc leading pieces (62) made of magnetic conductive material, which are arranged alternately along the up-down direction parallel to the axial direction of the push rod (5) on the inner wall of the arc extinguishing cover (1), and the plurality of arc extinguishing fins (61) and the plurality of arc leading pieces (62) are both L-shaped transversely placed, i.e., each of the arc extinguishing fins (61) is provided with a first section (611) extending in a second direction and a second section (612) extending in a third direction, and each of the arc leading pieces (62) is provided with a section A (620) extending in the second direction and a section B (621) extending in the third direction, and the second direction, the third direction and the up-down direction are perpendicular to each other; in addition, in each of the arc extinguishing assemblies (6), the plurality of arc leading pieces (62) can be magnetized by the magnetic field generated by the arc current to generate a magnetic field force that can pull the arc into the arc extinguishing assembly (6), and any one of the section A (620) away from the end of the section B (621) corresponding thereto and any one of the first section (611) away from the end of the second section (612) corresponding thereto together form a stepped structure that can force the arc to bend and be elongated.

2. The high-voltage DC contactor of claim 1, wherein: The arc extinguishing fins (61) are made of ceramic material, and the arc leading pieces (62) are made of iron.

3. The HVDC contactor of claim 1, wherein: In each of the arc extinguishing assemblies (6), the plurality of arc extinguishing fins (61) are integrally connected with the inner wall of the arc extinguishing cover (1), and the plurality of arc leading pieces (62) are clamped on the inner wall of the arc extinguishing cover (1).

4. The HVDC contactor of claim 1, wherein: The ends of the plurality of second sections (612) and the plurality of section B (621) on the same side are misaligned to form the stepped structure.

5. The HVDC contactor of claim 4, wherein: The two static contacts (3) are arranged side by side, and the side-by-side direction of the two static contacts (3) is parallel to the third direction.

6. The HVDC contactor of claim 5, wherein: The four arc extinguishing assemblies (6) are symmetrically arranged relative to the arc extinguishing cover (1) along the center line parallel to the direction of the line connecting the two static contacts (3).

7. The HVDC contactor of claim 1, wherein: In each of the arc extinguishing assemblies (6), a surface treatment layer is provided on the surface of the plurality of arc leading pieces (62).

8. The HVDC contactor of claim 1, wherein: The arc extinguishing chamber is filled with nitrogen, hydrogen or a mixture of the two.

9. The HVDC contactor of claim 1, wherein: The high-voltage DC contactor is also provided with magnetic steel (7), which is configured as at least two and symmetrically arranged on the two sides of the arc extinguishing cover (1) along the direction of the line connecting the two static contacts (3).

Images