High-voltage direct current contactor

Abstract

The utility model discloses a high-voltage direct current contactor, relates to the electric control device technical field, the high-voltage direct current contactor comprises a housing, a push rod and an arc isolation structure, the housing forms an accommodation cavity and is provided with two static contacts, the push rod is arranged at the driving end of a driving mechanism, at least part of the structure of the push rod extends into the accommodation cavity, and the arc isolation structure is arranged on the housing. One end, close to the two static contacts, of the push rod is provided with a movable contact piece, the shell is provided with an arc-isolating groove facing the arc-isolating structure, the arc-isolating structure is arranged on one side, back to the push rod, of the movable contact piece and located between the two static contacts, and the arc-isolating structure is provided with an arc-isolating rib facing the arc-isolating groove; according to the technical scheme provided by the utility model, when the movable contact piece and the two static contacts are closed, the arc-isolating rib is abutted against the arc-isolating groove so as to generate an isolating effect on an electric arc, and the arc-isolating rib and the arc-isolating groove form a bent path, so that a relatively good isolating effect on the electric arc is achieved, and potential safety hazards such as fire and explosion caused by conduction between the two static contacts are prevented; and the safety and the service life of the device are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric control devices, in particular to a high-voltage direct current contactor. Background Art

[0002] Contactors are divided into AC contactors and DC contactors, which are used in power, power distribution and power consumption. In a broad sense, contactors refer to electrical appliances in industrial electricity that use current flowing through a coil to generate a magnetic field to close the contacts in order to control the load. DC contactors can frequently connect and disconnect the DC main circuit, have large control capacity, and can be operated from a distance, and are widely used in automatic control circuits.

[0003] At present, the high-voltage DC contactor structure on the market includes a ceramic shell, and two static contacts, a moving contact piece and a driving mechanism installed in the cavity of the sealed shell. The moving contact piece and the two static contacts are arranged vertically opposite to each other. The driving mechanism mainly includes a driving coil, a moving iron core, a push rod and a reset spring. When the driving coil is energized, the magnetic force generated by it causes the push rod to move vertically upward, and drives the moving contact piece to connect with the two static contacts respectively, and the DC contactor is in a closed working state; when the driving coil is de-energized, the push rod moves vertically downward and resets under the action of the reset spring, and drives the moving contact piece to disconnect from the two static contacts respectively, and the DC contactor is in a disconnected working state.

[0004] When the moving contact piece and the two static contacts disconnect the current, an arc will be generated between the two due to the sudden interruption of the current. This is because the current tries to maintain its path, and the separation of the contacts causes the current density to increase sharply, thus generating a high-temperature arc. The high temperature causes the contact material to partially melt, forming molten copper chips. Under the action of the arc force and the magnetic field force, these molten copper chips may be thrown out of the contact surface, forming copper chip splashes. The splashing copper chips may form a circuit in which the two static contacts are connected in the cavity. If the breakdown withstand voltage value of the two is insufficient, fire and explosion will occur in the process, posing a safety hazard. Utility Model Content

[0005] The main purpose of the utility model is to provide a high-voltage DC contactor, aiming to provide a high-voltage DC contactor which can isolate two static contacts to prevent the conduction between the two static contacts from causing safety hazards.

[0006] To achieve the above object, the high voltage DC contactor proposed by the utility model comprises:

[0007] A housing, wherein the housing is formed with a receiving cavity, two static contacts are arranged in the housing, and parts of the structures of the two static contacts extend out of the housing;

[0008] A push rod, the push rod is arranged at the driving end of the driving mechanism, the driving mechanism is used to drive the push rod to reciprocate, at least part of the structure of the push rod extends into the accommodating cavity, and a moving contact piece is arranged at one end of the push rod close to the two static contacts, and the push rod can push the moving contact piece to contact or disengage with the two static contacts; and

[0009] An arc isolation structure, wherein the housing is provided with an arc isolation groove facing the arc isolation structure, the arc isolation structure is provided on a side of the moving contact piece facing away from the push rod and between the two static contacts, and the arc isolation structure is provided with an arc isolation rib facing the arc isolation groove;

[0010] The high-voltage DC contactor has an open state and a closed state. In the open state, the moving contact piece is separated from the two static contacts, and the arc isolation rib is separated from the arc isolation groove; in the closed state, the moving contact piece is in contact with the two static contacts, and the arc isolation rib is in contact with the bottom of the arc isolation groove.

[0011] In one embodiment, the arc isolation structure includes two arc isolation ribs, which are arranged at intervals, and the shell is formed with two arc isolation grooves facing the arc isolation structure, and each arc isolation rib is arranged opposite to an arc isolation groove.

[0012] In one embodiment, a push plate is provided at one end of the push rod close to the moving contact piece, and the push plate is provided with a mounting block. The mounting block is provided with two clamping grooves on the side facing the arc isolation structure, and two clamping protrusions are provided on the side of the arc isolation structure facing away from the arc isolation rib, and the two clamping protrusions are respectively clamped and fixed in the two clamping grooves.

[0013] In one embodiment, the high-voltage DC contactor further comprises an elastic member, and two ends of the elastic member are respectively connected to the push plate and the movable contact piece, so that the movable contact piece can move relative to the push rod.

[0014] In one embodiment, two auxiliary contacts are provided on a side of the shell facing the arc isolation structure, and parts of the structures of the two auxiliary contacts extend out of the shell. The arc isolation structure is provided with a conducting sheet, and the conducting sheet is located between the two clamping protrusions.

[0015] In one embodiment, two ends of the arc isolation structure are respectively formed with air avoidance grooves, and the air avoidance grooves are arranged opposite to the auxiliary contacts.

[0016] In one embodiment, the push plate is provided with a U-shaped bracket toward the movable contact piece, the U-shaped bracket includes two vertical plates spaced apart and a horizontal plate provided at the ends of the two vertical plates, the movable contact piece is located between the two vertical plates, and the mounting block is detachably provided on the U-shaped bracket.

[0017] In one embodiment, the U-shaped bracket also includes a fixing plate, which is arranged on a side of the transverse plate facing the dynamic contact piece, and the fixing plate is provided with a plurality of connecting columns, which pass through the transverse plate and are connected to the mounting block.

[0018] In one embodiment, the driving mechanism is a magnetic device, which includes a coil and a moving iron core. The coil is sleeved on the moving iron core, and one end of the push rod away from the moving contact piece is connected to the moving iron core.

[0019] In one embodiment, the shell includes an upper cover and a lower shell that are spliced ​​together, and the upper cover is provided with an inflation tube, and the inflation tube is connected to the interior of the accommodating cavity.

[0020] In the technical solution of the utility model, a high-voltage DC contactor is proposed, including a shell, a push rod and an arc-isolating structure. The shell forms a housing cavity and is provided with two static contacts. At least a part of the structure of the push rod extends into the housing cavity and is provided with a moving contact piece at one end close to the near point. The push rod is driven by a driving mechanism. When the driving mechanism drives the push rod downward, the push rod drives the moving contact piece to contact with the two static contacts to achieve closure. In this process, the arc-isolating structure arranged on the push rod will also move toward the bottom of the housing cavity. An arc-isolating groove is provided at the bottom of the housing cavity. Correspondingly, an arc-isolating rib is provided toward the arc-isolating groove of the arc-isolating structure. When the moving contact piece is closed with the two static contacts, the arc-isolating rib will abut against the arc-isolating groove to produce a blocking effect on the electric arc. Since the electric arc can only move along a straight line, and the arc-isolating rib and the arc-isolating groove form a curved path, the electric arc has a better isolating effect on the electric arc, thereby preventing the conduction between the two static contacts from causing safety hazards such as fire and explosion, thereby greatly improving the safety and service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 A schematic structural diagram of an embodiment of a high-voltage DC contactor provided by the utility model;

[0023] Figure 2 is a cross-sectional view of the high-voltage DC contactor in a closed state;

[0024] Figure 3 is a cross-sectional view of the high-voltage DC contactor in a disconnected state;

[0025] Figure 4A schematic diagram of the internal structure of the high-voltage DC contactor provided by the utility model;

[0026] Figure 5 for Figure 4 A partial enlarged view of the middle A;

[0027] Figure 6 A schematic diagram of the internal structure of the high-voltage DC contactor provided by the utility model from another angle;

[0028] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0029] Figure 8 It is a structural schematic diagram of the arc isolation structure.

[0030] Description of Figure Numbers:

[0031] 1000. High-voltage DC contactor; 1. Shell; 11. Upper cover; 111. Inflatable tube; 12. Lower shell; 121. Static contact; 122. Auxiliary contact; 123. Arc isolation groove; 2. Push rod; 21. Push plate; 22. Mounting block; 221. Snap-in groove; 23. Elastic member; 24. U-shaped bracket; 241. Vertical plate; 242. Horizontal plate; 25. Fixed plate; 251. Connecting column; 3. Magnetic device; 31. Moving iron core; 4. Moving contact piece; 41. Magnetic conductive plate; 5. Arc isolation structure; 51. Arc isolation rib; 52. Snap-in protrusion; 53. Air avoidance groove; 6. Conductive plate.

[0032] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0036] Contactors are divided into AC contactors and DC contactors, which are used in power, power distribution and power consumption. In a broad sense, contactors refer to electrical appliances in industrial electricity that use current flowing through a coil to generate a magnetic field to close the contacts in order to control the load. DC contactors can frequently connect and disconnect the DC main circuit, have large control capacity, and can be operated from a distance, and are widely used in automatic control circuits.

[0037] At present, the high-voltage DC contactor structure on the market includes a ceramic shell, and two static contacts, a moving contact piece and a driving mechanism installed in the cavity of the sealed shell. The moving contact piece and the two static contacts are arranged vertically opposite to each other. The driving mechanism mainly includes a driving coil, a moving iron core, a push rod and a reset spring. When the driving coil is energized, the magnetic force generated by it causes the push rod to move vertically upward, and drives the moving contact piece to connect with the two static contacts respectively, and the DC contactor is in a closed working state; when the driving coil is de-energized, the push rod moves vertically downward and resets under the action of the reset spring, and drives the moving contact piece to disconnect from the two static contacts respectively, and the DC contactor is in a disconnected working state.

[0038] When the moving contact piece and the two static contacts disconnect the current, an arc will be generated between the two due to the sudden interruption of the current. This is because the current tries to maintain its path, and the separation of the contacts causes the current density to increase sharply, thus generating a high-temperature arc. The high temperature causes the contact material to partially melt, forming molten copper chips. Under the action of the arc force and the magnetic field force, these molten copper chips may be thrown out of the contact surface, forming copper chip splashes. The splashing copper chips may form a circuit in which the two static contacts are connected in the cavity. If the breakdown withstand voltage value of the two is insufficient, fire and explosion will occur in the process, posing a safety hazard.

[0039] In order to solve the above problems, the utility model proposes a high-voltage DC contactor, which aims to provide a high-voltage DC contactor that can isolate two static contacts to prevent the conduction between the two static contacts from causing safety hazards. Figures 1 to 8 The present invention is a schematic structural diagram of an embodiment of a high-voltage DC contactor provided by the utility model.

[0040] Please refer to Figures 1 to 8 The utility model proposes a high-voltage DC contactor 1000, including a shell 1, a push rod 2 and an arc-isolating structure 5. The shell 1 is formed with a containing cavity. Two static contacts 121 are arranged in the shell 1. Part of the structure of the two static contacts 121 extends out of the shell 1. The push rod 2 is arranged at the driving end of the driving mechanism. The driving mechanism is used to drive the push rod 2 to reciprocate. At least part of the structure of the push rod 2 extends into the containing cavity. A moving contact piece 4 is arranged at one end of the push rod 2 close to the two static contacts 121. The push rod 2 can push the moving contact piece 4 to contact or disengage with the two static contacts 121. An arc-isolating groove 123 is formed on the shell 1 facing the arc-isolating structure 5. The arc-isolating structure 5 is arranged on the side of the moving contact piece 4 facing away from the push rod 2 and is located between the two static contacts 121. The arc-isolating structure 5 is provided with an arc-isolating rib 51 toward the arc-isolating groove 123.

[0041] In the technical solution of the utility model, a high-voltage DC contactor 1000 is proposed, including a shell 1, a push rod 2 and an arc isolation structure 5. The shell 1 is formed with a housing cavity and is provided with two static contacts 121. At least part of the structure of the push rod 2 extends into the housing cavity and is provided with a moving contact piece 4 at one end close to the near point. The push rod 2 is driven by a driving mechanism. When the driving mechanism drives the push rod 2 downward, the push rod 2 drives the moving contact piece 4 to contact with the two static contacts 121 to achieve closure. In this process, the arc isolation structure 5 provided on the push rod 2 will also move toward the housing cavity. The bottom moves, and an arc isolation groove 123 is provided at the bottom of the accommodating cavity. Correspondingly, an arc isolation rib 51 is provided towards the arc isolation groove 123 of the arc isolation structure 5. When the moving contact piece 4 and the two static contacts 121 are closed, the arc isolation rib 51 will abut against the arc isolation groove 123 to block the arc. The arc can only move along a straight line, and the arc isolation rib 51 and the arc isolation groove 123 form a curved path, which has a good isolation effect on the arc, thereby preventing the conduction between the two static contacts 121 from causing safety hazards such as fire and explosion, thereby greatly improving the safety and service life of the device.

[0042] It should be noted that the arc isolation structure 5 can be provided with one arc isolation rib 51, two arc isolation ribs 51 or more than two arc isolation ribs 51, and the present invention does not limit this. In one embodiment of the present invention, the number of arc isolation ribs 51 is two, and the two arc isolation ribs 51 extend in a direction perpendicular to the line connecting the two static contacts 121 and are arranged at intervals. When the arc isolation rib 51 contacts the inner bottom of the housing 1, since the bottom wall of the housing 1 is a flat surface, the arc can easily pass through, resulting in the contact position between the housing 1 and the arc isolation rib 51. Arc erosion is serious. In view of this, in the technical solution of the present invention, the shell 1 forms two arc isolation grooves 123 facing the arc isolation structure 5. The arc isolation grooves 123 cooperate with the arc isolation ribs 51. When the arc isolation ribs 51 are driven downward by the push rod 2, they will abut against the bottom wall of the arc isolation grooves 123 to form a U-shaped path. At this time, the arc is not easy to pass through the U-shaped path due to its characteristic of propagating in a straight line. This prevents the problem of ablation at the contact point between the shell 1 and the arc isolation ribs 51, further extending the electrical life of the equipment.

[0043] In order to further improve the rationality of the device structure and prevent the push rod 2 from bending, deforming or even breaking under force, a push plate 21 is provided at a section of the push rod 2 close to the moving contact piece 4. When the push rod 2 is subjected to force, the thrust is transmitted to the push plate 21, thereby driving the moving contact piece 4 to move and realize the closing and opening of the moving contact piece 4 and the static contact 121. For details, please refer to Figure 2 The push plate 21 is provided with a mounting block 22. The mounting block 22 is provided with two clamping grooves 221 on one side facing the arc isolation structure 5. The arc isolation structure 5 is provided with two clamping protrusions 52 on one side facing away from the arc isolation rib 51. The two clamping protrusions 52 are respectively clamped and fixed in the two clamping grooves 221. Since the arc isolation structure 5 is susceptible to arc erosion during operation, the arc isolation structure 5 is a consumable part. Such a configuration facilitates the repair and replacement of the arc isolation structure 5. When the arc isolation structure 5 is damaged, it can be quickly disassembled and replaced, thereby reducing the maintenance cost. Secondly, the detachable connection helps to improve the flexibility and adaptability of the equipment, so that the equipment can be quickly adjusted according to different working conditions or requirements. In addition, this design is also convenient for regular inspection and maintenance, which helps to extend the service life of the equipment and ensure its stable performance. The detachable connection also helps to reduce waste. The arc isolation structure 5 can be replaced separately instead of the entire equipment, which is more economical in terms of resources and costs.

[0044] In one embodiment of the present invention, the high voltage DC contactor 1000 further includes an elastic member 23. For details, please refer to Figure 4 and Figure 5, the two ends of the elastic member 23 are respectively connected to the push plate 21 and the moving contact piece 4, so that the moving contact piece 4 can move relative to the push rod 2. The soft contact between the moving contact piece 4 and the static contact 121 achieved by the elastic member 23 can reduce the impact force of the moving contact piece 4 when closing, reduce the contact resistance, thereby reducing the generation of arcs and extending the service life of the contactor. At the same time, soft contact helps to reduce mechanical wear, improve the reliability of contact, and ensure stable connection under high pressure. In addition, the buffering effect of the elastic member 23 can also absorb the slight displacement caused by vibration or thermal expansion, and maintain the continuity and consistency of contact. Further, the elastic member 23 can be a silicone sleeve or a spring, and the utility model does not limit this. In one embodiment of the utility model, the elastic member 23 is a spring, which has excellent elasticity and recovery ability, and can provide a stable and continuous force between the moving contact piece 4 and the static contact 121 to ensure a good electrical connection. The spring has high durability and can withstand repeated compression and release, which meets the needs of the high-voltage DC contactor 1000 in the frequent switching process. In addition, the spring has a simple structure, is easy to integrate and maintain, and is cost-effective, which helps to reduce the maintenance cost and complexity of the overall system. The spring is also highly adaptable, and its stiffness and strength can be adjusted according to different needs to adapt to different working conditions and load requirements. The upper part of the moving contact piece 4 is provided with a magnetic conductive plate 41, and the lower part is provided with a fixed plate 25. The magnetic conductive plate 41 and the fixed plate 25 together constitute an anti-short circuit unit. When a large fault current flows through the moving contact piece 4, the magnetic conductive plate 41 and the fixed plate 25 attract each other, thereby enhancing the contact pressure between the moving contact piece 4 and the static contact 121, and resisting the electric repulsion between the magnetic conductive plate 41 and the fixed plate 25 due to the fault current.

[0045] To prevent the moving contact piece 4 and the two stationary contacts 121 from sticking and being unable to disconnect after closing, which would generate an arc. The high temperature of the arc would burn the contact points of the two, causing damage to the contactor. Two auxiliary contacts 122 are provided on the side of the housing 1 facing the arc isolation structure 5. For details, please refer to Figure 1 and Figure 7 , part of the structure of the two auxiliary contacts 122 extends out of the shell 1 to connect the verification circuit, the arc isolation structure 5 is provided with a conducting piece, and the conducting piece is located between the two clamping protrusions 52. When the push rod 2 pushes the arc isolation structure 5 to move downward, the conducting piece on the arc isolation structure 5 will also move downward together until the two ends of the conducting piece are respectively in contact with the two auxiliary contacts 122, and the verification circuit is turned on. At this time, the moving contact piece 4 and the two static contacts 121 of the high-voltage DC contactor 1000 are also in contact, and the contactor is closed. If the moving contact piece 4 and the two static contacts 121 are adhered after closing, the verification circuit is always in the on state. When the preset alarm time is reached, the verification circuit will alarm or use other means to directly cut off the connection between the moving contact piece 4 and the auxiliary contact 122, thereby ensuring the safety of the equipment.

[0046] Since the arc isolation structure 5 is made of plastic material and is an insulator, in order to prevent the auxiliary contact 122 from contacting the arc isolation structure 5 and causing conduction failure, air-avoiding grooves 53 are formed at both ends of the arc isolation structure 5. For details, please refer to Figure 8 , the air-avoiding groove 53 is arranged relative to the auxiliary contact 122. When the push rod 2 drives the arc-isolating structure 5 downward, the auxiliary contact 122 will pass through the air-avoiding groove 53 and contact the conducting piece to achieve conduction. In order to improve the structural reliability, the push plate 21 is provided with a U-shaped bracket toward the moving contact piece 4. The U-shaped bracket directly includes two vertical plates 241 arranged at intervals and a horizontal plate 242 connecting the ends of the two vertical plates 241. For details, please refer to Figure 4 and Figure 6 The moving contact piece 4 is located between the two vertical plates 241, and the mounting block 22 is detachably arranged on the U-shaped bracket. In this way, the mounting block 22 can be disassembled, which improves the convenience of assembling the device. To install the mounting block 22, the U-shaped bracket directly includes a fixing plate 25. For details, please refer to Figure 6 The fixing plate 25 is arranged on the side of the transverse plate 242 facing the dynamic contact piece 4. The fixing plate 25 is provided with a plurality of connecting columns 251. The plurality of connecting columns 251 pass through the transverse plate 242 and are connected to the mounting block 22. Accordingly, an external thread can be provided on the outer surface of the connecting column 251, and a threaded hole or a through hole is opened in the mounting block 22 for fastening with a nut.

[0047] In the technical solution of the present utility model, the driving mechanism can be a magnetic device 3, or a cylinder or other pneumatic, hydraulic or other driving methods, and the present utility model does not limit this. In one embodiment of the present utility model, the driving mechanism is a magnetic device 3, and the magnetic device 3 includes a moving iron core 31. For details, please refer to Figure 2 , a coil (not marked in the figure) is arranged on the periphery of the moving iron core 31. When the coil is energized, a magnetic field is generated to drive the moving iron core 31 to move up and down, thereby driving the push rod to move, driving the moving contact piece 4 to move toward the static contact 121 and close with it, thereby connecting the circuit. When the coil is de-energized, the magnetic field disappears, and the moving contact piece 4 returns to the initial position under the action of the spring force, disconnects from the static contact 121, and cuts off the circuit. This driving method has a fast response speed and is simple to control. The closing force of the contactor can be controlled by adjusting the size of the coil current, ensuring reliable electrical connection in the high-voltage DC system.

[0048] In order to realize the installation and removal of internal components, the housing 1 adopts a combination of an upper cover 11 and a lower shell 12, which are spliced ​​together. The upper cover 11 is provided with an inflation tube 111. For details, please refer to Figure 1The gas filling tube 111 is connected to the interior of the containing cavity, and the gas filling tube 111 is used to infuse hydrogen into the containing cavity. The hydrogen is mainly used to provide an environment with high insulation strength. As an insulating medium, hydrogen has high insulation performance, which can effectively prevent current leakage and ensure electrical isolation inside the contactor. In addition, hydrogen can also help reduce the arc inside the contactor, because the arc is more easily extinguished in hydrogen, thereby protecting the contact points of the contactor from damage and extending the service life of the equipment. At the same time, the filling of hydrogen can also help reduce the volume and weight of the contactor, because compared with other insulating media, hydrogen can provide the same insulation effect at a lower pressure, making the contactor design more compact. The gas filling tube 111 adopts a one-way structure to prevent safety hazards caused by hydrogen leakage.

[0049] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A high voltage DC contactor, characterized in that: include: A housing, wherein the housing is formed with a receiving cavity, two static contacts are arranged in the housing, and parts of the structures of the two static contacts extend out of the housing; A push rod, the push rod is arranged at the driving end of the driving mechanism, the driving mechanism is used to drive the push rod to reciprocate, at least part of the structure of the push rod extends into the accommodating cavity, and a moving contact piece is arranged at one end of the push rod close to the two static contacts, and the push rod can push the moving contact piece to contact or disengage with the two static contacts; as well as An arc isolation structure, wherein the housing is provided with an arc isolation groove facing the arc isolation structure, the arc isolation structure is provided on a side of the moving contact piece facing away from the push rod and between the two static contacts, and the arc isolation structure is provided with an arc isolation rib facing the arc isolation groove; The high-voltage DC contactor has an open state and a closed state. In the open state, the moving contact piece is separated from the two static contacts, and the arc isolation rib is separated from the arc isolation groove; in the closed state, the moving contact piece is in contact with the two static contacts, and the arc isolation rib is in contact with the bottom of the arc isolation groove.

2. The high voltage DC contactor according to claim 1, characterized in that: The arc isolation structure comprises two arc isolation ribs, which are arranged at intervals. The shell is formed with two arc isolation grooves facing the arc isolation structure, and each arc isolation rib is arranged opposite to an arc isolation groove.

3. The high voltage DC contactor according to claim 2, characterized in that: A push plate is provided at one end of the push rod close to the moving contact piece, and the push plate is provided with a mounting block. The mounting block is provided with two clamping grooves on the side facing the arc isolation structure, and two clamping protrusions are provided on the side of the arc isolation structure facing away from the arc isolation rib, and the two clamping protrusions are respectively clamped and fixed in the two clamping grooves.

4. The high voltage DC contactor according to claim 3, characterized in that: The high-voltage DC contactor further comprises an elastic member, two ends of which are respectively connected to the push plate and the movable contact piece, so that the movable contact piece can move relative to the push rod.

5. The high voltage DC contactor according to claim 3, characterized in that: Two auxiliary contacts are arranged on one side of the shell facing the arc isolation structure, and parts of the structures of the two auxiliary contacts extend out of the shell. The arc isolation structure is provided with a conducting sheet, and the conducting sheet is located between the two clamping protrusions.

6. The high voltage DC contactor according to claim 5, characterized in that: Both ends of the arc isolation structure are respectively formed with air avoidance grooves, and the air avoidance grooves are arranged opposite to the auxiliary contacts.

7. The high voltage DC contactor according to claim 3, characterized in that: The push plate is provided with a U-shaped bracket toward the moving contact piece, the U-shaped bracket includes two vertical plates arranged at intervals and a horizontal plate arranged at the ends of the two vertical plates, the moving contact piece is located between the two vertical plates, and the mounting block is detachably arranged on the U-shaped bracket.

8. The high voltage DC contactor according to claim 7, characterized in that: The U-shaped bracket also includes a fixing plate, which is arranged on a side of the transverse plate facing the dynamic contact piece, and the fixing plate is provided with a plurality of connecting columns, which pass through the transverse plate and are connected to the mounting block.

9. The high voltage DC contactor according to any one of claims 1 to 8, characterized in that: The driving mechanism is a magnetic device, which includes a coil and a moving iron core. The coil is sleeved on the moving iron core, and one end of the push rod away from the moving contact piece is connected to the moving iron core.

10. The high voltage DC contactor according to any one of claims 1 to 8, characterized in that: The shell comprises an upper cover and a lower shell which are spliced ​​together. The upper cover is provided with an air filling pipe which is connected to the interior of the accommodating cavity.

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