High-voltage direct current contactor

Abstract

The high-voltage direct-current contactor comprises a shell, an insulating base, a fixing piece, a coil frame, a coil, an end cover, a magnetic loop assembly, a sealing assembly and a movable contact assembly, the insulating base and the fixing piece are connected with the shell, the magnetic loop assembly is arranged on the insulating base and the fixing piece, the coil frame and the coil are connected with the magnetic loop assembly, and the movable contact assembly is arranged on the end cover. The coil is arranged on the coil rack, the shell is connected with the end cover, and the magnetic loop assembly, the sealing assembly and the moving contact assembly are arranged in a cavity between the shell and the end cover. According to the structure scheme of the subminiature high-voltage direct-current contactor provided by the invention, a magnetic ring structure is added in a magnetic circuit structure which is different from a conventional magnetic circuit design. Larger magnetic attraction force is provided under the condition of limited space, and miniaturization design is realized. In addition, the gas-guide tube is arranged at the end part of the armature housing, and compared with a conventional contactor which is arranged on a magnetizer or a ceramic seat, part of space is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of contactors, and in particular relates to a high-voltage direct current contactor. Background Art

[0002] In order to meet the lightweight requirements of its supporting products, an ultra-small high-voltage DC contactor is needed, which not only meets the requirements of small size and light weight, but also meets the requirements of higher environmental indicators. The requirements of multiple indicators bring design difficulties. For example, higher environmental indicators require that the overtravel compression spring of the product has a larger holding force in the excited state, and the return spring has a larger initial pressure in the non-excited state to provide contact pressure and the anti-mechanical environmental force of the motion mechanism. Large spring pressure will inevitably require a relatively large electromagnetic suction force to make the product close in the excited state, which requires a higher power electromagnetic system. However, the requirements of small size and light weight limit the improvement of the suction force of the electromagnetic system, which brings difficulties to the design of the electromagnetic system.

[0003] The patent document with the announcement number CN106783411A discloses a DC contactor, including: a contact unit, an arc extinguishing magnetic control component, an excitation coil system and an operating system. The DC contactor designed by the present invention can generate a self-generated magnetic field through the arc extinguishing magnetic control component to achieve magnetic blowing out of the DC arc, eliminating the dependence of the traditional high-voltage DC contactor on the external magnetic blowing device, avoiding the influence of the external magnetic blowing device on the DC arc extinguishing due to degradation, failure, gas evolution, and single strength. The invention adopts non-polar DC magnetic blowing out, and sets the exhaust pipe on the ceramic, which increases the processing difficulty and cost.

[0004] The patent document with the announcement number CN111613485A discloses a high-voltage DC contactor, including a ceramic combination, an exhaust pipe, a magnet, an armature cover, an armature, a return spring, a static iron core, a transmission rod, a contact bridge, an overtravel spring, a magnet insulating gasket, a contact bridge insulating gasket, a shell, a shell bushing, a coil lead wire, a coil combination and a magnetic steel combination. The present invention adds an auxiliary contact in addition to the two static contacts. When the contactor is connected, the transmission rod drives the contact bridge to contact the two static contacts and an auxiliary contact respectively, and the contacts in the disconnected state form conduction. At the same time, the connected auxiliary contacts and the two static contacts can form an auxiliary conduction circuit in pairs, which is used for external interlocking timing control or contactor self-locking and interlocking functions. However, the patent does not disclose the magnetic ring structure composed of a magnetic ring and annular magnetic steel. At the same time, the patent sets the exhaust pipe on the magnet, resulting in a waste of space.

[0005] The above patent is a traditional magnetic circuit design method with low magnetic efficiency and requires a larger coil load to drive, resulting in an increase in the size and weight of the contactor. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a high-voltage DC contactor.

[0007] The present invention is achieved through the following technical solutions.

[0008] A high-voltage DC contactor provided by the present invention comprises a shell, an insulating seat, a fixing plate, a coil frame, a coil, an end cover, a magnetic circuit assembly, a sealing assembly and a moving contact assembly, wherein the insulating seat and the fixing plate are connected to the shell, the magnetic circuit assembly is arranged on the insulating seat and the fixing plate, the coil frame and the coil are connected to the magnetic circuit assembly, the coil is arranged on the coil frame, the shell is connected to the end cover, and the magnetic circuit assembly, the sealing assembly and the moving contact assembly are arranged in a cavity between the shell and the end cover.

[0009] Preferably, an installation groove A is provided on the insulating seat, the fixing plate is provided in the installation groove A, the inner wall plane of the bottom of the insulating seat is flush with the top plane of the fixing plate, the fixing plate is made of ceramic, the magnetic circuit assembly is placed in the insulating seat, the magnetic circuit assembly includes a yoke, a pole shoe, an armature, a static iron core and a magnetic conductor, the yoke is connected to the insulating seat, the coil frame is provided on the insulating seat, the pole shoe is provided on one side of the yoke, the bottom of the pole shoe is connected to the fixing plate, the top of the pole shoe is connected to the magnetic conductor, one side of the pole shoe is connected to the coil frame, and the other side of the pole shoe is connected to the armature and the static iron core.

[0010] Preferably, a magnetic ring and annular magnetic steel are arranged on the pole shoe, the magnetic ring and the annular magnetic steel are connected, the magnetic ring and the annular magnetic steel are both annular structures, the magnetic ring, the static iron core and the magnetic body are all made of electromagnetic pure iron, and the annular magnetic steel is made of neodymium iron boron rare earth.

[0011] Preferably, a groove A is provided on the armature, a groove B, a groove C and a through hole A are provided on the static iron core, the groove B and the groove C are connected through the through hole A, and the transmission rod passes through the static iron core through the through hole A.

[0012] Preferably, the sealing assembly includes an exhaust pipe, an armature cover, a ceramic seat and a static contact, the exhaust pipe is connected to one end of the armature cover, the ceramic seat is connected to the inner wall of the top of the end cover, the static contact passes through the end cover and the top of the ceramic seat to form a connection, the ceramic seat is a square cavity structure, the ceramic seat is made of alumina ceramic, the static contact is made of copper alloy, and the static contact is welded to the ceramic seat.

[0013] Preferably, a sealing ring is provided at the bottom of the ceramic seat, the sealing ring is respectively connected to the ceramic seat and the end cover, and the sealing ring is made of metal.

[0014] Preferably, the dynamic contact assembly includes a restoring spring, a bracket, a transmission rod, an over-travel compression spring, a lower guide sleeve, a guide sleeve, and a contact bridge. The restoring spring, the bracket, and the over-travel compression spring are respectively connected to the magnetic circuit assembly. The bracket is placed on the circuit assembly. The transmission rod passes through the magnetic circuit assembly and is slidably connected. One end of the transmission rod passes through and connects the lower guide sleeve and the guide sleeve. The lower guide sleeve is connected to the guide sleeve. The lower guide sleeve and the guide sleeve are respectively connected to the contact bridge, and the bottom of the lower guide sleeve is connected to the over-travel compression spring.

[0015] Preferably, a snap ring is provided on the guide sleeve, and the snap ring is respectively connected to the transmission rod and the guide sleeve, the lower guide sleeve, the guide sleeve and the snap ring are made of metal, the contact bridge is in a long strip structure, and the contact bridge is made of copper alloy.

[0016] Preferably, a magnetic steel, a magnetic conductive sheet and a rubber pad are arranged in the end cover, the magnetic steel and the rubber pad are respectively connected to the inner wall of the end cover, and the magnetic conductive sheet is connected to the end cover through the magnetic steel.

[0017] Preferably, the shell is made of aluminum alloy, the insulating seat is made of plastic, and the end cover is made of plastic.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a structural solution for an ultra-small high-voltage DC contactor, in which a magnetic ring structure is added to the magnetic circuit structure, which is different from the conventional magnetic circuit design. A greater magnetic attraction force is provided under limited space conditions, thereby realizing a miniaturized design. In addition, the air guide tube is designed to be located at the end of the armature housing, which saves some space compared to the conventional contactor placed on a magnetic conductor or a ceramic seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the shell;

[0022] Figure 3 It is a structural diagram of the insulating seat;

[0023] Figure 4 It is a schematic diagram of the structure of a ceramic sheet;

[0024] Figure 5 It is a schematic diagram of the structure of the yoke;

[0025] Figure 6 It is a schematic diagram of the structure of the coil frame;

[0026] Figure 7 It is a schematic diagram of the structure of the coil;

[0027] Figure 8 It is a schematic diagram of the structure of the pole shoe;

[0028] Fig. 9 It is a schematic diagram of the structure of the exhaust pipe;

[0029] Fig.10 It is a structural schematic diagram of the armature cover;

[0030] Fig.11 It is a schematic diagram of the structure of the armature;

[0031] Fig.12 It is a schematic diagram of the structure of the restoring spring;

[0032] Fig.13 It is a structural schematic diagram of the magnetic ring;

[0033] Fig.14 It is a structural diagram of the ring magnetic steel;

[0034] Fig.15 It is a structural diagram of the static iron core;

[0035] Fig.16 It is a schematic diagram of the structure of the magnetic conductor;

[0036] Fig.17 is a schematic diagram of the structure of the bracket;

[0037] Fig.18 It is a schematic diagram of the structure of the transmission rod;

[0038] Fig.19 It is a structural diagram of an overtravel compression spring;

[0039] Fig. 20 1 is a structural schematic diagram of the lower guide sleeve;

[0040] Fig.21 It is a structural schematic diagram of the guide sleeve;

[0041] Fig. 22 It is a schematic diagram of the structure of the clasp;

[0042] Fig.23 It is a schematic diagram of the structure of the contact bridge;

[0043] Fig.24 is a schematic diagram of the structure of the sealing ring;

[0044] Fig.25 It is a structural diagram of a ceramic seat;

[0045] Fig.26 It is a schematic diagram of the structure of the static contact;

[0046] Fig. 27 It is a schematic diagram of the structure of magnetic steel;

[0047] Fig.28 It is a structural schematic diagram of the magnetic conductive sheet;

[0048] Fig.29 It is a schematic diagram of the structure of the rubber pad;

[0049] Fig.30 It is a schematic diagram of the structure of the end cover;

[0050] In the figure: 1-housing, 2-insulating seat, 201-mounting groove A, 3-fixed plate, 4-yoke, 5-coil frame, 6-coil, 7-pole shoe, 8-exhaust pipe, 9-armature cover, 10-armature, 101-groove A, 11-restoring spring, 12-magnetic ring, 13-ring magnetic steel, 14-static iron core, 141-groove B, 142-groove C, 143-through hole A, 15-magnetic body, 16-bracket, 17-transmission rod, 18-overtravel compression spring, 19-lower guide sleeve, 20-guide sleeve, 21-clamp ring, 22-contact bridge, 23-sealing ring, 24-ceramic seat, 25-static contact, 26-magnetic steel, 27-magnetic sheet, 28-rubber pad, 29-end cover. DETAILED DESCRIPTION

[0051] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0052] Example:

[0053] like Figures 1 to 30 As shown, a high-voltage DC contactor includes a shell 1, an insulating seat 2, a fixing plate 3, a coil frame 5, a coil 6, an end cover 29, a magnetic circuit assembly, a sealing assembly and a moving contact assembly, the insulating seat 2 and the fixing plate 3 are connected to the shell 1, the magnetic circuit assembly is arranged on the insulating seat 2 and the fixing plate 3, the coil frame 5 and the coil 6 are connected to the magnetic circuit assembly, the coil 6 is arranged on the coil frame 5, the shell 1 is connected to the end cover 29, and the magnetic circuit assembly, the sealing assembly and the moving contact assembly are arranged in a cavity between the shell 1 and the end cover 29.

[0054] The insulating seat 2 is provided with an installation groove A201, the fixing plate 3 is arranged in the installation groove A201, the inner wall plane of the bottom of the insulating seat 2 is flush with the top plane of the fixing plate 3, the fixing plate 3 is made of ceramic, the magnetic circuit assembly is placed in the insulating seat 2, the magnetic circuit assembly includes a yoke 4, a pole shoe 7, an armature 10, a static iron core 14 and a magnet 15, the yoke 4 is connected to the insulating seat 2, the coil frame 5 is arranged on the insulating seat 2, the pole shoe 7 is arranged on one side of the yoke 4, the bottom of the pole shoe 7 is connected to the fixing plate 3, the top of the pole shoe 7 is connected to the magnet 15, one side of the pole shoe 7 is connected to the coil frame 5, and the other side of the pole shoe 7 is connected to the armature 10 and the static iron core 14.

[0055] The pole shoe 7 is provided with a magnetic ring 12 and a ring magnetic steel 13, the magnetic ring 12 and the ring magnetic steel 13 are connected, the magnetic ring 12 and the ring magnetic steel 13 are both annular structures, the magnetic ring 12, the static iron core 14 and the magnet 15 are all made of electromagnetic pure iron, and the ring magnetic steel 13 is made of neodymium iron boron rare earth.

[0056] The armature 10 is provided with a groove A101, the static iron core 14 is provided with a groove B141, a groove C142 and a through hole A143, the groove B141 and the groove C142 are connected through the through hole A143, and the transmission rod 17 passes through the static iron core 14 through the through hole A143.

[0057] The sealing assembly includes an exhaust pipe 8, an armature cover 9, a ceramic seat 24 and a static contact 25. The exhaust pipe 8 is connected to one end of the armature cover 9, the ceramic seat 24 is connected to the inner wall of the top of the end cover 29, and the static contact 25 penetrates the end cover 29 and the top of the ceramic seat 24 to form a connection. The ceramic seat 24 is a square cavity structure, the ceramic seat 24 is made of alumina ceramic, the static contact 25 is made of copper alloy, and the static contact 25 is welded to the ceramic seat 24.

[0058] A sealing ring 23 is disposed at the bottom of the ceramic seat 24 . The sealing ring 23 is connected to the ceramic seat 24 and the end cover 29 respectively. The sealing ring 23 is made of metal.

[0059] The dynamic contact assembly includes a restoring spring 11, a bracket 16, a transmission rod 17, an overtravel compression spring 18, a lower guide sleeve 19, a guide sleeve 20, and a contact bridge 22. The restoring spring 11, the bracket 16, and the overtravel compression spring 18 are respectively connected to the armature 10 and the static iron core 14 of the magnetic circuit assembly. One end of the restoring spring 11 is placed in the groove A101, and the other end of the restoring spring 11 is placed in the groove B141. The bracket 16 is placed on the magnetic conductor 15 of the circuit assembly. The transmission rod 17 penetrates the static iron core 14 of the magnetic circuit assembly for sliding connection. The bottom end of the transmission rod 17 extends into the armature 10 for sliding connection. The overtravel compression spring 18 is arranged in the groove C142. One end of the transmission rod 17 penetrates and connects the lower guide sleeve 19 and the guide sleeve 20. The lower guide sleeve 19 and the guide sleeve 20 are connected. The lower guide sleeve 19 and the guide sleeve 20 are respectively connected to the contact bridge 22, and the bottom of the lower guide sleeve 19 is connected to the overtravel compression spring 18.

[0060] A snap ring 21 is provided on the guide sleeve 20, and the snap ring 21 is connected to the transmission rod 17 and the guide sleeve 20 respectively. The lower guide sleeve 19, the guide sleeve 20 and the snap ring 21 are made of metal. The contact bridge 22 is in a long strip structure and is made of copper alloy.

[0061] A magnetic steel 26 , a magnetic conductive sheet 27 and a rubber pad 28 are disposed in the end cover 29 . The magnetic steel 26 and the rubber pad 28 are respectively connected to the inner wall of the end cover 29 , and the magnetic conductive sheet 27 is connected to the end cover 29 through the magnetic steel 26 .

[0062] The shell 1 is made of aluminum alloy, the insulating seat 2 is made of plastic, and the end cover 29 is made of plastic.

[0063] The housing 1 is a cavity-shaped structure made of aluminum alloy, which can improve the mechanical resistance of the contactor. The internal cavity is used to install the parts of the contactor, and the bottom is provided with mounting ears for installation and positioning of the contactor.

[0064] The insulating seat 2 is made of plastic and has supporting and insulating functions.

[0065] The ceramic sheet 3 is made of aluminum nitride ceramic and has insulation and heat conduction functions.

[0066] The yoke 4 is made of electromagnetic pure iron, and forms a magnetic circuit with the pole shoe 7, the armature 10, the static iron core 14, and the magnetic conductor 15. The inner cavity of the yoke 4 is equipped with a coil 6. When the coil is excited, the magnetic circuit has the characteristic of being closed, so that the armature 10 moves upward to complete the magnetic circuit closure. At the same time, the transmission rod 17 installed at the end of the armature 10 moves together, and the contact bridge 22 installed on the transmission rod 17 also moves upward to close with the static contact 25, completing the suction process.

[0067] The coil frame 5 serves as the framework of the coil and performs the functions of support, shaping and insulation.

[0068] The coil 6 is wound by enameled wire and generates an electromagnetic field when a rated excitation is applied to provide electromagnetic attraction.

[0069] The pole shoe 7 is an annular structure, made of electromagnetic pure iron. As a part of the magnetic circuit, it provides a medium for magnetic flux transmission.

[0070] The exhaust pipe 8 is made of a copper pipe, which plays the role of exhausting the internal air and filling the arc extinguishing gas. In the present invention, the part is designed at the end of the armature housing 9, which improves the space utilization of the contactor.

[0071] The armature housing 9 is made of metal, and the bottom is connected to the exhaust pipe 8 by welding. The end, the magnetic conductor 15, the sealing ring 23, the ceramic seat 24 and other components together form a sealed cavity to provide a sealed environment for the contact system.

[0072] The armature 10 is a cylindrical structure made of electromagnetic pure iron. It is the moving part in the magnetic circuit and the key to the realization of the contactor function. It is installed at one end of the transmission rod 17. When the contactor is excited, the electromagnetic suction force generated makes it move upward, and drives the transmission rod 17, the contact bridge 22 and other components to move upward together, realizing the contactor's suction action, that is, the contactor is excited to close. When the contactor is de-excited, it moves downward with the transmission rod 17 under the action of the restoring force of the restoring spring 11, realizing the contactor disconnection action.

[0073] The restoring spring 11 is made of spring steel wire and is installed on the transmission rod 17. One end of the spring contacts the armature 10 and the other end contacts the static iron core 14. When de-energized, the spring provides downward pressure to the transmission rod 17, causing it to move downward to disconnect the contactor. At the same time, it provides a reaction force for the moving parts to resist mechanical environmental loads.

[0074] The magnetic ring 12 is an annular structure and is made of electromagnetic pure iron. The magnetic ring 12 and the ring magnetic steel 13 together form a magnetic ring structure. Adding the magnetic ring structure can effectively enhance the magnetic field strength of the electromagnetic circuit, optimize the magnetic field distribution, and achieve the effect of improving the electromagnetic attraction without increasing the volume.

[0075] The ring magnet 13 is a ring structure, made of rare earth such as neodymium iron boron, and can form a permanent magnet after magnetization, and form a magnetic ring structure with the magnetic conductive ring 12 to enhance the magnetic field.

[0076] The static iron core 14 is an annular structure and is made of electromagnetic pure iron. As a part of the magnetic circuit, it provides a medium for magnetic flux transmission.

[0077] The magnetic conductor 15 is a plate-like structure made of electromagnetic pure iron. As a part of the magnetic circuit, it provides a medium for magnetic flux transmission and is also a part of the sealed cavity.

[0078] The bracket 16 is made of plastic and has certain arc isolation and welding spatter prevention functions.

[0079] The transmission rod 17 is made of metal and serves as a transmission component of the contactor movement mechanism. One end of the transmission rod 17 is connected to the armature 10. As the armature 10 moves upward under the electromagnetic attraction, the motion is transmitted to the contact bridge 22 installed at the other end, so that the contact bridge 22 contacts the static contact 25 to realize the excitation and closing function of the contactor. When the armature 10 moves downward, the motion is transmitted to separate the contact bridge 22 from the static contact 25, thereby realizing the de-excitation and disconnection function of the contactor.

[0080] The overtravel compression spring 18 is made of spring steel wire and is installed between the lower guide sleeve 19 and the transmission rod 17 to provide contact pressure for the contact system through compression.

[0081] The lower guide sleeve 19 is an annular structure, made of metal. It is installed on the transmission rod 17 to play a guiding role.

[0082] The guide sleeve 20 is an annular structure, made of metal, and is installed on the transmission rod 17 to play a guiding role.

[0083] The clamping ring 21 is made of metal and plays a limiting role.

[0084] The contact bridge 22 is a long strip structure made of copper alloy. It is fixed on the transmission rod 17 through the lower guide sleeve 19 and the guide sleeve 20. When the contactor is in the energized state, its upper surface contacts the static contact 25 to realize the energized connection function of the contactor. When it is in the de-energized state, it moves downward with the transmission rod 17 and disconnects from the static contact 25 to realize the de-energized disconnection function of the contactor.

[0085] The sealing ring 23 is an annular structure made of metal, and forms a sealed cavity with the ceramic seat 24, the static contact 25, the magnetic conductor 15, and the armature cover 9 through a welding process, providing a sealed environment for the contact system composed of the contact bridge 22, the static contact 25, etc., and the arc extinguishing gas is filled into the interior through the exhaust pipe 8 to achieve the arc extinguishing function.

[0086] The ceramic seat 24 is a square cavity structure, made of alumina ceramics, and is a part of the sealed cavity.

[0087] The stationary contact 25 is a cylindrical structure made of copper alloy. It is mounted on the ceramic base 24 by welding. One end forms a contact system with the contact bridge 22, and the other end extends out of the upper part of the contactor and has an internal thread, serving as the connection end of the load circuit.

[0088] The magnetic steel 26 is made of rare metals such as neodymium iron boron, and can form a permanent magnet after magnetization, providing a permanent magnetic field for the magnetic blow-out arc extinguishing system.

[0089] The magnetic conductive sheet 27 is a sheet metal structure made of electromagnetic pure iron, and two arc extinguishing magnetic steels 26 are connected to the two ends to provide a medium for magnetic flux transmission.

[0090] The rubber pad 28 is made of silicone rubber and plays a buffering role to protect the internal components of the contactor.

[0091] The end cover 29 is made of plastic and has a hollow structure inside. It cooperates with the housing 1 to form the contactor outer structure and protect the inside of the contactor.

[0092] When in use, the contactor is installed through the mounting ears of the housing 1, and after the coil is energized with rated excitation, the contactor completes the action to achieve a specific function.

Claims

1. A high voltage DC contactor, characterized in that: The invention comprises a shell (1), an insulating seat (2), a fixing plate (3), a coil frame (5), a coil (6), an end cover (29), a magnetic circuit component, a sealing component and a moving contact component, wherein the insulating seat (2) and the fixing plate (3) are connected to the shell (1), the magnetic circuit component is arranged on the insulating seat (2) and the fixing plate (3), the coil frame (5) and the coil (6) are connected to the magnetic circuit component, the coil (6) is arranged on the coil frame (5), the shell (1) is connected to the end cover (29), and the magnetic circuit component, the sealing component and the moving contact component are arranged in a cavity between the shell (1) and the end cover (29).

2. A high voltage DC contactor according to claim 1, characterized in that: The insulating seat (2) is provided with a mounting groove A (201), the fixing plate (3) is arranged in the mounting groove A (201), the inner wall plane of the bottom of the insulating seat (2) is flush with the top plane of the fixing plate (3), the fixing plate (3) is made of ceramic, the magnetic circuit component is placed in the insulating seat (2), the magnetic circuit component comprises a yoke (4), a pole shoe (7), an armature (10), a static iron core (14) and a magnetic conductor (15), the yoke (4) is connected to the insulating seat (2), the coil frame (5) is arranged on the insulating seat (2), the pole shoe (7) is arranged on one side of the yoke (4), the bottom of the pole shoe (7) is connected to the fixing plate (3), the top of the pole shoe (7) is connected to the magnetic conductor (15), one side of the pole shoe (7) is connected to the coil frame (5), and the other side of the pole shoe (7) is connected to the armature (10) and the static iron core (14).

3. A high voltage DC contactor as claimed in claim 2, characterized in that: A magnetic ring (12) and an annular magnetic steel (13) are arranged on the pole shoe (7); the magnetic ring (12) and the annular magnetic steel (13) are connected; the magnetic ring (12) and the annular magnetic steel (13) are both annular structures; the magnetic ring (12), the static iron core (14) and the magnetic body (15) are all made of electromagnetic pure iron; and the annular magnetic steel (13) is made of neodymium iron boron rare earth.

4. A high voltage DC contactor as claimed in claim 2, characterized in that: The armature (10) is provided with a groove A (101), the static iron core (14) is provided with a groove B (141), a groove C (142) and a through hole A (143), the groove B (141) and the groove C (142) are connected through the through hole A (143), and the transmission rod (17) passes through the static iron core (14) through the through hole A (143).

5. A high voltage DC contactor according to claim 1, characterized in that: The sealing assembly comprises an exhaust pipe (8), an armature cover (9), a ceramic seat (24) and a stationary contact (25); the exhaust pipe (8) is connected to one end of the armature cover (9); the ceramic seat (24) is connected to the inner wall of the top of the end cover (29); the stationary contact (25) penetrates the end cover (29) and the top of the ceramic seat (24) to form a connection; the ceramic seat (24) is a square cavity structure; the ceramic seat (24) is made of alumina ceramic; the stationary contact (25) is made of copper alloy; and the stationary contact (25) is connected to the ceramic seat (24) by welding.

6. A high voltage DC contactor as claimed in claim 5, characterized in that: A sealing ring (23) is arranged at the bottom of the ceramic seat (24), and the sealing ring (23) is respectively connected to the ceramic seat (24) and the end cover (29), and the sealing ring (23) is made of metal.

7. A high voltage DC contactor according to claim 1, characterized in that: The moving contact assembly comprises a restoring spring (11), a bracket (16), a transmission rod (17), an overtravel compression spring (18), a lower guide sleeve (19), a guide sleeve (20), and a contact bridge (22). The restoring spring (11), the bracket (16), and the overtravel compression spring (18) are respectively connected to the magnetic circuit assembly. The bracket (16) is placed on the circuit assembly. The transmission rod (17) penetrates the magnetic circuit assembly and is slidably connected. One end of the transmission rod (17) penetrates and connects the lower guide sleeve (19) and the guide sleeve (20). The lower guide sleeve (19) and the guide sleeve (20) are connected. The lower guide sleeve (19) and the guide sleeve (20) are respectively connected to the contact bridge (22). The bottom of the lower guide sleeve (19) is connected to the overtravel compression spring (18).

8. A high voltage DC contactor according to claim 7, characterized in that: A snap ring (21) is arranged on the guide sleeve (20), and the snap ring (21) is connected to the transmission rod (17) and the guide sleeve (20) respectively. The lower guide sleeve (19), the guide sleeve (20) and the snap ring (21) are made of metal. The contact bridge (22) is in a long strip structure, and the contact bridge (22) is made of copper alloy.

9. A high voltage DC contactor according to claim 1, characterized in that: A magnetic steel (26), a magnetic conductive sheet (27) and a rubber pad (28) are arranged inside the end cover (29); the magnetic steel (26) and the rubber pad (28) are respectively connected to the inner wall of the end cover (29); and the magnetic conductive sheet (27) is connected to the end cover (29) via the magnetic steel (26).

10. A high voltage DC contactor according to claim 1, characterized in that: The shell (1) is made of aluminum alloy, the insulating seat (2) is made of plastic, and the end cover (29) is made of plastic.

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