High-voltage direct-current contactor with contact protection structure

Abstract

The utility model discloses a high-voltage DC contactor with a contact protection structure, and relates to the technical field of electric control devices, the high-voltage DC contactor with the contact protection structure comprises a housing, a push rod assembly and the contact protection structure, the housing is provided with a static contact and an auxiliary contact, the push rod assembly is provided with a movable end close to the static contact, and the contact protection structure is provided with a movable end close to the auxiliary contact. The movable end is provided with a moving contact and a conduction sheet, the conduction sheet is arranged facing the auxiliary contact, the contact protection structure is arranged on the shell and sleeves the conduction sheet, and an opening is formed in one side, facing the auxiliary contact, of the contact protection structure so that the auxiliary contact is exposed on a motion path of the conduction sheet; in the technical scheme provided by the utility model, no matter what working state the high-voltage direct-current contactor is in, the auxiliary contact and the conduction sheet are both located in the contact protection structure, and the contact protection structure can well isolate the auxiliary contact from the accommodating cavity in the shell, so that the contact protection structure is more reliable. Therefore, dust and particulate matters are prevented from falling on the surface of the auxiliary contact to influence the conductivity of the contact.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric control device, especially relates to a high voltage direct current contactor with contact protection structure. BACKGROUND

[0002] As a kind of long-distance connection and breaking DC circuit electric appliance, high voltage direct current contactor has the characteristics of large control capacity, suitable for frequent operation and remote intelligent control etc. It plays an important role in power system. It is widely used in solar system, urban rail, subway, charging pile, energy storage battery pack, uninterruptible power supply, communication industry and other fields. High voltage direct current contactor can withstand thousands of volts or even higher voltage without breakdown, flashover and other phenomena, and carry or break several hundred amperes of current. Contact part is specially designed to ensure long life and reliability under frequent operation and extreme working conditions. In addition, high voltage direct current contactor has the characteristics of small size and light weight, which is convenient for transportation, installation and maintenance, reduces downtime and maintenance cost, and further ensures the safety, efficiency and reliability of power transmission.

[0003] High voltage direct current contactor plays the role of automatic regulation, safety protection and conversion circuit in circuit. In the structure of high voltage direct current relay, two groups of contact assemblies are usually provided, one group is main contact assembly, which is used as low voltage driving part to control the on-off of main circuit, and the other group is auxiliary contact assembly, which is used as auxiliary logic switch of system circuit control function.

[0004] Among them, for auxiliary contact assembly, the structure shown in the patent document with publication number CN110164737A is usually adopted in the industry, but the auxiliary contact assembly of this structure has the following disadvantages: with the progress of electrical life and mechanical life test, dust and particulate matter in the contactor shell will gradually increase. Dust and particulate matter will affect the contact conductivity after falling on the contact surface. Dust and particulate will be ablated under high voltage and large current, but auxiliary contact cannot burn dust and particulate due to small current and voltage, thereby affecting the use function of auxiliary contact assembly. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a high voltage direct current contactor with contact protection structure, which can form good protection for auxiliary contact and avoid auxiliary contact conduction failure.

[0006] To achieve the above purpose, the utility model provides a high voltage direct current contactor with contact protection structure, which comprises:

[0007] The shell is formed with a containing cavity, and the shell is provided with a static contact and an auxiliary contact.

[0008] A push rod assembly is provided with a movable end close to the fixed contact, the movable end is provided with a movable contact and a conducting piece, the conducting piece is arranged to face the auxiliary contact, the movable contact can be in contact with or separated from the fixed contact, and the conducting piece can be in contact with or separated from the auxiliary contact; and

[0009] A contact protection structure is arranged in the shell and covers the conducting piece, and an opening is formed on the side of the contact protection structure facing the auxiliary contact to expose the auxiliary contact on the movement path of the conducting piece.

[0010] The high-voltage DC contactor with the contact protection structure has an open state and a closed state, in the open state, the movable contact is separated from the fixed contact, the auxiliary contact and the conducting piece, and in the closed state, the movable contact is in contact with the two fixed contacts, the auxiliary contact and the conducting piece.

[0011] In an embodiment, the shell includes an upper shell and a yoke plate covering the opening of the upper shell, the push rod assembly is arranged in the yoke plate, the contact protection structure is arranged in the yoke plate, and the end of the contact protection structure away from the yoke plate abuts against the inner side wall of the upper shell facing the yoke plate.

[0012] In an embodiment, the yoke plate facing the contact protection structure is provided with a plurality of clamping protrusions, the plurality of clamping protrusions form a clamping groove matching the shape of the contact protection structure, and part of the structure of the contact protection structure is clamped and fixed in the clamping groove.

[0013] In an embodiment, the yoke plate facing the contact protection structure is provided with a connecting column, the contact protection structure is provided with a connecting hole, and the connecting column and the connecting hole are screw-connected.

[0014] In an embodiment, the two opposite side walls of the upper shell are respectively provided with two spaced-apart limiting ribs, and the four limiting ribs and the inner wall of the upper shell together form an accommodating groove.

[0015] The contact protection structure is arranged in the accommodating groove, and the two ends of the contact protection structure close to the limiting ribs are respectively provided with limiting bosses which abut against and limit the limiting ribs.

[0016] In an embodiment, the push rod assembly includes a driving mechanism, a push plate and an elastic member, the push plate is arranged at the driving end of the driving mechanism and located in the accommodating cavity, the conducting piece and the elastic member are arranged on the push plate, and the movable contact is arranged on the elastic member.

[0017] In an embodiment, the contact protection structure is provided with a relief groove on the side facing the push plate, and part of the structure of the push plate is arranged in the relief groove and can move from the groove opening to the groove bottom.

[0018] In an embodiment, the push plate is provided with a support, the support is located between the two elastic members and in the contact protection structure, and the conducting sheet is arranged on the support.

[0019] In an embodiment, the high-voltage direct-current contactor with the contact protection structure comprises two groups of static contact parts and two groups of dynamic contact parts, each group of the static contact parts comprises two static contacts, each group of the dynamic contact parts comprises one dynamic contact sheet, and each two static contacts cooperate with one dynamic contact sheet.

[0020] The auxiliary contact is arranged between the two groups of static contact parts, and the contact protection structure and the conducting sheet are arranged between the two groups of dynamic contact parts.

[0021] In an embodiment, the driving mechanism is a magnetic device, the magnetic device comprises a coil and a moving iron core, the coil is sleeved on the moving iron core, and one end of the push plate away from the dynamic contact sheet is connected with the moving iron core.

[0022] In the technical scheme of the utility model, a high-voltage direct-current contactor with a contact protection structure is provided, which comprises a shell, static contacts and an auxiliary contact arranged in a containing cavity of the shell, a push rod assembly and a contact protection structure, one end of the push rod assembly close to the static contact is provided with a dynamic contact, one end close to the auxiliary contact is provided with a conducting sheet, the contact protection structure is arranged in the shell and sleeved on the conducting sheet, and a display opening is formed on the side facing the auxiliary contact to make the auxiliary contact exposed on the movement path of the conducting sheet, when the high-voltage direct-current contactor is disconnected, the dynamic contact is separated from the static contact, the auxiliary contact and the conducting sheet, when the high-voltage direct-current contactor is closed, the dynamic contact is in contact with the two static contacts, the auxiliary contact and the conducting sheet, in the process, the auxiliary contact and the conducting sheet are located in the inside of the contact protection structure, the contact protection structure can be well isolated from the auxiliary contact and the containing cavity in the shell body, thereby avoiding the influence of dust and particulate matter falling on the surface of the auxiliary contact on the contact conductivity. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0024] Figure 1The utility model provides a structure schematic diagram of one embodiment of high voltage direct current contactor with contact protection structure.

[0025] Figure 2 For Figure 1 The internal structure schematic diagram of high voltage direct current contactor with contact protection structure in the utility model.

[0026] Figure 3 The sectional view of high voltage direct current contactor with contact protection structure.

[0027] Figure 4 For Figure 1 The structure schematic diagram of contact protection structure in the utility model.

[0028] Figure 5 For Figure 1 The structure schematic diagram of yoke iron sheet in the utility model.

[0029] Figure 6 For Figure 1 The structure schematic diagram of upper shell in the utility model.

[0030] Explanation of the attached drawing:

[0031] 100, high voltage direct current contactor with contact protection structure;1, shell;11, upper shell;111, limiting rib;112, accommodating groove;12, yoke iron sheet;121, clamping convex;13, static contact;14, auxiliary contact;2, push rod assembly;21, push plate;22, elastic piece;23, support;3, dynamic contact sheet;4, contact protection structure;41, exposure port;42, avoiding groove;43, limiting boss;5, conducting sheet.

[0032] The utility model realizes the purpose, functional characteristics and advantages, and will be further described with reference to the attached drawings. Specific implementation

[0033] The technical scheme in the utility model embodiment will be clearly and completely described below with reference to the attached drawings in the utility model embodiment. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

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

[0035] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0036] The utility model provides a kind of high-voltage direct current contactors with contact protection structure, to provide a kind of high-voltage direct current contactor can form good protection to auxiliary contact to avoid auxiliary contact conduction fault, Figures 1 to 6 It is the structure schematic diagram of an embodiment provided by the utility model high-voltage direct current contactor with contact protection structure.

[0037] Please refer to Figures 1 to 6 The utility model provides a kind of high-voltage direct current contactor 100 with contact protection structure, including shell 1, push rod assembly 2 and contact protection structure 4, shell 1 is formed with the accommodation cavity, static contact 13 and auxiliary contact 14 are equipped in shell 1, push rod assembly 2 is equipped with the movable end close to static contact 13, movable end is equipped with moving contact and conducting sheet 5, conducting sheet 5 is set to auxiliary contact 14, moving contact can contact or separate from static contact 13, conducting sheet 5 can contact or separate from auxiliary contact, contact protection structure 4 is set in shell 1 and is set in conducting sheet 5, one side of contact protection structure 4 is formed with exposure port 41 to make auxiliary contact 14 expose on the movement path of conducting sheet 5, facing auxiliary contact 14.

[0038] The above-mentioned high-voltage direct current contactor has open state and closed state, in open state, moving contact and static contact 13, auxiliary contact 14 and conducting sheet 5 are all separated;In closed state, moving contact and two static contacts 13, auxiliary contact 14 and conducting sheet 5 are all contacted.

[0039] The utility model discloses a technical scheme, propose a kind of high-voltage direct-current contactor 100 with contact protection structure, including shell 1, the static contact 13 and auxiliary contact 14 of being arranged in the cavity of shell 1 content, push rod assembly 2 and contact protection structure 4, push rod assembly 2 is equipped with moving contact in the end close to static contact 13, it is equipped with conducting sheet 5 in the end close to auxiliary contact 14, contact protection structure 4 is arranged in shell 1 and is set in conducting sheet 5, and it is formed with the exposure port 41 that auxiliary contact 14 is exposed on the movement path of conducting sheet 5 on the side towards auxiliary contact 14, when high-voltage direct-current contactor 100 with contact protection structure is disconnected, moving contact is separated from static contact 13, auxiliary contact 14 and conducting sheet 5, when high-voltage direct-current contactor 100 with contact protection structure is closed, moving contact is contacted with two static contacts 13, auxiliary contact 14 and conducting sheet 5, in this process, auxiliary contact 14 and conducting sheet 5 are located in the inside of contact protection structure 4, contact protection structure 4 can be well isolated auxiliary contact 14 and the cavity of shell body interior, to avoid dust, particulate matter fall on auxiliary contact surface after influencing contact conductivity.

[0040] In the working process of the contactor, due to the frequent connection and disconnection of the contact, an arc is generated, and the high temperature of the arc can evaporate the contact material and condense into fine particles. These particles will then scatter inside the contactor. In this process, the dust and particulate matter generated have a small volume. In order to ensure that the auxiliary contact 14 does not come into contact with the dust and particulate matter, it is necessary to ensure that the auxiliary contact 14 and the conducting sheet 5 are not exposed to the cavity of the shell 1. In view of this, the contact protection structure 4 proposed in this case is arranged at one end of the yoke plate 12 and abuts against the inner side wall of the upper shell body 11 facing the yoke plate 12. For details, please refer to Figure 3 The independent space formed by the yoke plate 12, the contact protection structure 4, and the inner wall of the upper shell body 11 effectively isolates the dust and particulate matter in the cavity, thereby effectively protecting the auxiliary contact 14. Further, a sealing ring can also be arranged at the abutting position of the contact protection structure 4 and the upper shell body 11. The use of deformable but high-temperature-resistant materials such as silicone rubber and polytetrafluoroethylene can better optimize the dust isolation effect.

[0041] To ensure the safe and stable operation of the contactor in a high-voltage environment, the contact protection structure 4 is preferably made of ceramic or plastic. The utility model does not limit the material of the contact protection structure 4. Any insulating material with a certain structural strength can be used for the contact protection structure 4. The use of insulating materials can improve the insulation performance of the contactor, prevent the generation of arcs between contacts, prolong the service life of the contactor, ensure the safe and stable operation of the contactor in a high-voltage environment, and improve the mechanical strength and wear resistance of the contactor, adapting to complex working environments.

[0042] It should be noted that the contact protection structure 4 can be fixed on the yoke plate 12 in a clamping manner, can be fixed on the yoke plate 12 in a screwing manner, or can be fixed and installed in a clamping and screwing combined manner, and the utility model does not make any limitation on this, and any simple modification, equivalent change and modification made on the above embodiments according to the technical essence of the utility model still belong to the protection range of the technical scheme of the utility model.

[0043] In an embodiment of the utility model, the contact protection structure 4 is fixed on the yoke plate 12 in a clamping manner, correspondingly, the yoke plate 12 is provided with a plurality of clamping protrusions 121 facing the contact protection structure 4, specifically, further referring to Figure 2 And Figure 5 The utility model does not make any limitation on the number of clamping protrusions 121, in the embodiment, there are six clamping protrusions, of which two clamping protrusions 121 are arranged in the width direction of the contact protection structure 4, and the other four clamping protrusions 121 are arranged in the length direction of the contact protection structure 4, every two clamping protrusions 121 are clamped with an outer side wall of the contact protection structure 4, and the clamping groove (not marked in the figure) formed by the six clamping protrusions 121 is clamped and fixed with the contact protection structure 4 in an interference fit manner, the interference fit can provide strong structural stability and tight connection strength, so that the contact surface between the two can be tightly fitted, thereby ensuring the firmness and reliability of the connection. This matching mode can effectively prevent the relative sliding or loosening of the contact protection structure 4 and the yoke plate 12 caused by external impact, vibration or temperature change.

[0044] In another embodiment of the utility model, the contact protection structure 4 is fixed on the yoke plate 12 in a screwing manner, one side of the yoke plate 12 facing the contact protection structure 4 is provided with a connecting column, correspondingly, the contact protection structure 4 is provided with a connecting hole, the connecting column is configured as a connecting column with external threads, when installing the contact protection structure 4, a connecting hole on the contact protection structure 4 is sleeved on a connecting column on the yoke plate 12, and then a nut is screwed, so as to realize fixation, through the screwing manner, it is also convenient for later disassembly, maintenance and replacement, and the overall structural strength can also be better guaranteed.

[0045] In order to facilitate the installation and cooperation of the contact protection structure 4 and the upper shell 11, the two opposite side walls of the upper shell 11 are respectively provided with two spaced limiting ribs 111, a total of four limiting ribs 111, specifically, further referring to Figure 6 The four limiting ribs 111 and the inner wall of the upper shell 11 jointly form an accommodating groove 112, the contact protection structure 4 is arranged in the accommodating groove 112, and the two ends of the contact protection structure 4 close to the limiting ribs 111 are respectively provided with limiting bosses 43, specifically, further referring to Figure 4Each two limiting ribs 111 are clamped and matched with one limiting boss 43 to realize the limiting of the contact protection structure 4.

[0046] To further improve the rationality of the stress of the equipment structure, the pushing rod assembly 2 comprises a driving structure and a pushing plate 21, and specifically, please further refer to Figure 2 The movable pushing rod (not marked in the figure) is arranged in the driving structure, and when the pushing rod is stressed, the pushing force is transmitted to the pushing plate 21 to drive the moving contact piece 3 to move, so that the moving contact piece 3 is closed and opened with the static contact 13, the conducting piece 5 is arranged on the pushing plate 21 and moves with the pushing plate 21 to make the conducting piece 5 abut against or be separated from the auxiliary contact 14, and the contact protection structure 4 is sleeved on the conducting piece 5, so that the movement of the pushing plate 21 inevitably interferes with the contact protection structure 4, and therefore, the avoiding groove 42 is designed at one end of the contact protection structure 4 close to the pushing plate 21, so that the problem of interference between the movement of the pushing plate 21 and the contact protection structure 4 is well solved, and specifically, please further refer to Figure 4 The distance between the groove bottom of the avoiding groove 42 and the yoke plate 12 is slightly greater than the movement distance of the pushing plate 21, so that the two do not interfere with each other.

[0047] In an embodiment of the utility model, the high-voltage direct-current contactor 100 with the contact protection structure further comprises an elastic member 22, and specifically, please further refer to Figure 2 The two ends of the elastic member 22 are connected with the pushing plate 21 and the moving contact piece 3 respectively, so that the moving contact piece 3 can move relative to the pushing plate 21, and the soft contact between the moving contact piece 3 and the static contact 13 realized by the elastic member 22 can reduce the impact force of the moving contact piece 3 when being closed, reduce the contact resistance, thereby reducing the generation of arc, prolonging the service life of the contactor. At the same time, the soft contact can help to reduce mechanical wear and tear, improve the reliability of the contact, and ensure stable connection in a high-voltage environment. In addition, the buffering effect of the elastic member 22 can also absorb the slight displacement caused by vibration or thermal expansion, maintain the continuity and consistency of the contact. Further, the elastic member 22 can adopt a silica gel sleeve or a spring, and the utility model does not limit this. In an embodiment of the utility model, the elastic member 22 is a spring, which has excellent elasticity and recovery ability, can provide stable and continuous force between the moving contact piece 3 and the static contact 13, and ensure good electrical connection. The spring has high durability and can withstand repeated compression and release, meeting the needs of the high-voltage direct-current contactor in the frequent switching process.

[0048] To install the conducting piece 5, the side of the pushing plate 21 facing the auxiliary contact 14 is provided with a support 23, and specifically, please further refer to Figure 3The bracket 23 is located between the two elastic members 22 and in the contact protection structure 4, and the conducting sheet 5 is arranged on the bracket 23, so that the bracket 23 can further shorten the distance between the conducting sheet 5 and the auxiliary contact 14, thereby ensuring that the conducting sheet 5 can be in contact with the auxiliary contact 14 during the upward movement of the push plate 21.

[0049] In an embodiment of the utility model, the high-voltage direct-current contactor 100 with the contact protection structure adopts the layout of two groups of contact structures, and the high-voltage direct-current contactor includes two groups of static contact parts and two groups of dynamic contact parts, each group of static contact parts includes two static contacts 13, each group of dynamic contact parts includes one dynamic contact sheet 3, each two static contacts 13 cooperates with one dynamic contact sheet 3, the auxiliary contact 14 is arranged between the two groups of static contact parts, and the contact protection structure 4 and the conducting sheet 5 are arranged between the two groups of dynamic contact parts.

[0050] In the technical scheme of the utility model, the driving mechanism can be a magnetic device, a cylinder or other driving modes such as pneumatic and hydraulic, and the utility model does not limit this, in an embodiment of the utility model, the driving mechanism is a magnetic device, the magnetic device includes a moving iron core, a coil (not marked in the figure) is arranged on the periphery of the moving iron core, the coil generates a magnetic field to drive the moving iron core to move up and down, thereby driving the push rod to move, the dynamic contact sheet 3 is driven to move towards the static contact and is closed with the static contact, thereby connecting the circuit. When the coil is de-energized, the magnetic field disappears, and the dynamic contact sheet 3 returns to the initial position under the action of the spring force, and is disconnected with the static contact, thereby cutting off the circuit. This driving mode has fast response speed and simple control, and the closing force of the contactor can be controlled by adjusting the size of the coil current, thereby ensuring that reliable electrical connection is realized in the high-voltage direct-current system.

[0051] The above only describes exemplary embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation, direct / indirect application in other related technical fields made by the utility model specification and the drawings contents under the technical concept of the utility model are included in the patent protection range of the utility model.

Claims

1. A high-voltage DC contactor with a contact protection structure, characterized in that, include: The housing has a receiving cavity and is provided with a stationary contact and an auxiliary contact. A push rod assembly has a movable end near the stationary contact. The movable end has a moving contact and a conductive plate. The conductive plate is disposed facing the auxiliary contact. The moving contact can contact or disengage from the stationary contact, and the conductive plate can contact or disengage from the auxiliary contact. as well as A contact protection structure is provided on the housing and sleeved on the conductive piece. The side of the contact protection structure facing the auxiliary contact has an exposure opening so that the auxiliary contact is exposed on the movement path of the conductive piece. The high-voltage DC contactor with contact protection structure has an open state and a closed state. In the open state, the moving contact is disengaged from the stationary contact, the auxiliary contact, and the conductive plate. In the closed state, the moving contact is in contact with both stationary contacts, the auxiliary contact, and the conductive plate.

2. The high-voltage DC contactor with contact protection structure as described in claim 1, characterized in that, The outer casing includes an upper casing and a yoke plate covering an opening in the upper casing. The push rod assembly is disposed on the yoke plate, and the contact protection structure is disposed on the yoke plate. One end of the contact protection structure away from the yoke plate abuts against the inner sidewall of the upper casing facing the yoke plate.

3. The high-voltage DC contactor with contact protection structure as described in claim 2, characterized in that, The yoke plate has multiple snap-fit ​​protrusions facing the contact protection structure. The multiple snap-fit ​​protrusions surround and form a snap-fit ​​groove that matches the shape of the contact protection structure. Part of the contact protection structure is snapped and fixed to the snap-fit ​​groove.

4. The high-voltage DC contactor with contact protection structure as described in claim 2, characterized in that, The yoke plate has a connecting post on the side facing the contact protection structure, and the contact protection structure has a connecting hole. The connecting post is screwed into the connecting hole.

5. The high-voltage DC contactor with contact protection structure as described in claim 2, characterized in that, The upper shell has two spaced-apart limiting ribs on its two opposite side walls, and the four limiting ribs and the inner wall of the upper shell together form a receiving groove. The contact protection structure is disposed in the receiving groove. The two ends of the contact protection structure near the limiting rib are respectively provided with limiting bosses, and the limiting bosses cooperate with the limiting rib to abut and limit the contact.

6. The high-voltage DC contactor with contact protection structure as described in any one of claims 1 to 5, characterized in that, The push rod assembly includes a drive mechanism, a push plate, and an elastic element. The push plate is disposed at the drive end of the drive mechanism and located within the receiving cavity. The conductive piece and the elastic element are both disposed on the push plate, and the moving contact is disposed on the elastic element.

7. The high-voltage DC contactor with contact protection structure as described in claim 6, characterized in that, The contact protection structure has a clearance groove on the side facing the push plate. A portion of the push plate is located in the clearance groove and can move from the opening of the clearance groove to the bottom of the clearance groove.

8. The high-voltage DC contactor with contact protection structure as described in claim 6, characterized in that, The push plate is provided with a bracket, which is located between the two elastic elements and within the contact protection structure, and the conductive piece is provided on the bracket.

9. The high-voltage DC contactor with a contact protection structure as described in any one of claims 1 to 5, characterized in that, The high-voltage DC contactor with contact protection structure includes two sets of stationary contact parts and two sets of moving contact parts. Each set of stationary contact parts includes two stationary contacts, and each set of moving contact parts includes one moving contact piece. Every two stationary contacts cooperate with one moving contact piece. The auxiliary contact is disposed between the two sets of static contact portions, and the contact protection structure and the conductive piece are disposed between the two sets of dynamic contact portions.

10. The high-voltage DC contactor with contact protection structure as described in claim 9, 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 the end of the push plate away from the moving contact piece is connected to the moving iron core.

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