High-voltage direct current contactor and use method thereof

Abstract

The invention discloses a high-voltage direct-current contactor and a use method thereof, and relates to the technical field of direct-current contactors, the high-voltage direct-current contactor is arranged upside down during use, and the position and the use state of an indication iron core and the position of a movable contact piece are displayed by observing whether the indication iron core is exposed out of the bottom surface of a U-shaped yoke. And the maintenance and installation personnel can judge the state of the whole high-voltage loop by visually indicating the position of the iron core, so that dangers such as high-voltage electric shock and the like are avoided. The indicating iron core, the magnetic ring and the yoke iron ring form a magnetic circuit, the position of the magnetic ring can be controlled through the magnetic circuit and the position of the movable iron core, then position movement of the indicating iron core is controlled, the mechanical position indicating function is achieved, the positions of the indicating iron core and the movable contact piece are strictly synchronous, electromagnetic interference is avoided, and the position of the indicating iron core can still be kept in the power-off state. Faults can be accurately judged by using the difference between the working state and the standby state, and the fault diagnosis convenience of the product is improved.

Description

Technical Field

[0001] This invention relates to the field of DC contactor technology, and more particularly to a high-voltage DC contactor and its usage method. Background Technology

[0002] Against the backdrop of the rapid development of the new energy industry, high-voltage DC contactors, as core electrical components, directly affect the operational stability of the entire system due to their reliability, safety, and integration level. Existing high-voltage DC contactors generally employ ceramic brazing or laser welding sealing processes, filled with inert gas, and feature low leakage rate, high reliability, long lifespan, and low risk of arc leakage. They are widely used in key scenarios such as the power circuits of new energy vehicles and the energy transmission circuits of integrated photovoltaic-storage-charging power stations.

[0003] Meanwhile, according to national and industry safety standards (such as GB / T14048.1-2022 "Low-voltage switchgear and controlgear - Part 1: General Rules" and GB / T34132-2017 "High-voltage DC contactors for electric vehicles"), switchgear used for isolation purposes must have a position indication function that is strictly synchronized with the position of the moving contact, so that operators can intuitively judge the on / off status of the main circuit during installation, maintenance and daily inspection, and avoid safety accidents such as high-voltage electric shock caused by misjudgment.

[0004] However, most high-voltage DC contactor products on the market still have significant defects: On the one hand, existing products lack reliable and intuitive mechanical position indicators. Some products use electronic induction indicators, which are susceptible to electromagnetic interference, leading to distorted indications. Furthermore, they cannot provide effective indications when the power is off, making it difficult to meet the mandatory requirements for safety isolation. On the other hand, traditional dual-circuit high-voltage DC contactors mostly adopt a dual-coil drive structure, that is, two independent coils drive two sets of contact mechanisms respectively. This results in a larger overall product size and higher system cost. Moreover, the synchronous control accuracy of the dual coils is low, which easily leads to problems of asynchronous circuit opening and closing. In addition, some products excessively increase the volume of the insulation structure in pursuit of high-voltage insulation performance, resulting in low product integration and an inability to adapt to the development trend of lightweight and miniaturized new energy equipment.

[0005] In conclusion, there is an urgent need for a high-voltage DC contactor and its usage method to solve the above problems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a high-voltage DC contactor and its usage method, which solves the problem of integrating a mechanical position indication function while ensuring sealing performance, ensuring strict synchronization between the position of the indicating iron core and the position of the moving contact, improving the accuracy of the main circuit on / off judgment, and simultaneously determining whether a sticking fault has occurred in the main circuit by indicating the position of the iron core.

[0007] On one hand, the present invention proposes a high-voltage DC contactor, including a ceramic cover and a U-shaped yoke; the ceramic cover and the U-shaped yoke are fixedly connected; a stationary contact is fixedly installed on the top of the ceramic cover, a movable moving contact is provided below the stationary contact, a push rod is fixedly connected below the moving contact, and a movable indicator core is provided below the push rod, the position of the moving contact is determined by the position of the indicator core.

[0008] The ceramic cover is disposed on the top of the high voltage DC contactor, and the stationary contact is fixedly mounted on the top of the ceramic cover by a first solder sheet.

[0009] A movable contact piece is installed inside the ceramic cover. The movable contact piece is located below the stationary contact. A contact spring is fixedly installed below the movable contact piece. A bracket is connected to the other end of the contact spring away from the movable contact piece. A fixing frame is fixedly installed above the bracket. The fixing frame is located between the two stationary contacts in the width direction. The movable contact piece is located inside the fixing frame. A push rod is connected to the lower part of the bracket.

[0010] The ceramic cover and the U-shaped yoke are fixedly connected by a yoke plate. The push rod is movably mounted on the yoke plate, with one end connected to the bracket and the other end extending to the bottom of the yoke plate.

[0011] The stationary iron core is fixedly installed below the yoke plate, and a moving iron core is arranged below the stationary iron core. A return spring is arranged between the moving iron core and the stationary iron core, and the moving iron core and the return spring are located at the bottom of the push rod. A magnetic ring is fixedly installed below the moving iron core. An iron core shell is fitted over the stationary iron core, the moving iron core, and the magnetic ring. An indicator iron core is fixedly installed below the iron core shell, and an indicator spring is installed between the indicator iron core and the iron core shell. A guide sleeve is installed below the indicator iron core, and the guide sleeve is fixedly installed at the bottom of the U-shaped yoke. A yoke ring is also fixedly installed above the guide sleeve. The indicator iron core, the magnetic ring, and the yoke ring form a magnetic circuit.

[0012] A coil frame is fixedly installed on the outside of the iron core shell. The top of the coil frame is fixedly installed below the yoke plate, and the bottom of the coil frame is fixedly installed above the U-shaped yoke.

[0013] In a preferred embodiment of the present invention, the coil frame includes a fixing member, a first fixing member, a second fixing member, and a support frame; the fixing member is disposed at the top of the coil frame, the first fixing member is disposed at one end of the coil frame near the fixing member; the support frame is disposed at the bottom of the coil frame, the second fixing member is disposed at one end of the coil frame near the support frame, and the diameter of the second fixing member is larger than that of the first fixing member; the inner wall of the first fixing member is connected to the iron core shell, and the inner wall of the second fixing member is connected to the yoke ring.

[0014] In a preferred embodiment of the present invention, an inner ring enameled wire and an outer ring enameled wire are installed between the fixing member and the support frame; the inner ring enameled wire is disposed between the outer ring enameled wire and the second fixing member.

[0015] As a preferred embodiment of the present invention, a number of coil pins are fixedly installed on one side of the support frame, and the coil pins are plugged into the circuit board.

[0016] As a preferred embodiment of the present invention, a wire is fixedly connected to one side of the circuit board.

[0017] As a preferred embodiment of the present invention, a first isolation plate and a second isolation plate are installed on the top of the ceramic cover.

[0018] In a preferred embodiment of the present invention, two brackets, a fixed frame and a movable contact piece are provided, and the two brackets are connected by a connector, with a push rod fixedly connected below the connector.

[0019] As a preferred embodiment of the present invention, a plurality of baffles are installed between the bracket and the connector.

[0020] In a preferred embodiment of the present invention, the push rod is fitted into the center of the yoke plate via a washer.

[0021] In a preferred embodiment of the present invention, the iron core shell and the yoke plate are fixedly connected and sealed by laser welding.

[0022] In a preferred embodiment of the present invention, the ceramic cover is fixedly connected and sealed to the square frame, the yoke plate, and the stationary contact by brazing.

[0023] In a preferred embodiment of the present invention, the connector is made of plastic material, and the push rod, bracket and connector are integrally formed by injection molding.

[0024] As a preferred embodiment of the present invention, a first protrusion is provided at the bottom of the iron core shell, a groove is provided at the top of the indicator iron core, and a second protrusion is provided in the groove.

[0025] On the other hand, the present invention demonstrates a method of using a high-voltage DC contactor, wherein the high-voltage DC contactor used is the aforementioned high-voltage DC contactor, specifically including: the high-voltage DC contactor is installed upside down during use, and by observing whether the indicator core is exposed on the surface of the guide sleeve and the U-shaped yoke, the position of the indicator core, the usage status and the position of the moving contact piece are displayed, thereby determining whether a sticking fault has occurred in the main circuit.

[0026] As a preferred embodiment of the present invention, the high-voltage DC contactor has two operating states: standby state and operating state.

[0027] As a preferred embodiment of the present invention, when the high-voltage DC contactor is in standby mode, the stationary contact and the moving contact are disconnected, the stationary iron core and the moving iron core are disconnected, the magnetic ring is placed below the moving iron core, indicating that the iron core moves upward under the magnetic force of the magnetic ring and is close to the surface of the iron core shell, indicating that the lower section of the iron core is flush with the guide sleeve and the U-shaped yoke, indicating that the iron core does not extend outside the U-shaped yoke.

[0028] As a preferred embodiment of the present invention, when the high-voltage DC contactor is in the working state, the stationary contact and the moving contact are connected, the stationary iron core and the moving iron core are connected, the magnetic ring moves upward with the moving iron core, and the indicating iron core moves downward when there is a lack of magnetization attraction and the reaction force of the indicating spring. The indicating iron core extends out of the guide sleeve and the surface of the U-shaped yoke, thereby realizing mechanical main circuit position indication.

[0029] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0030] 1. The present invention discloses a high-voltage contactor and its usage method. By setting the high-voltage DC contactor to be installed upside down during use, the position of the indicator core, its usage status, and the position of the moving contact are displayed by observing whether the indicator core is exposed on the bottom surface of the U-shaped yoke. This allows for the determination of whether the main circuit has a sticking fault. Maintenance and installation personnel can visually determine whether the entire high-voltage circuit is closed or open by observing the position of the indicator core, thus avoiding dangers such as high-voltage electric shock.

[0031] 2. The high-voltage contactor and its usage method disclosed in this invention comprises a stationary contact fixedly mounted on the top of a ceramic cover, a movable moving contact plate disposed below the stationary contact, a push rod fixedly connected below the moving contact plate, a moving iron core disposed below the stationary iron core, a return spring disposed between the moving iron core and the stationary iron core, and the moving iron core and the return spring disposed at the bottom of the push rod; a magnetic ring fixedly mounted below the moving iron core; an iron core shell fitting around the stationary iron core, the moving iron core, and the magnetic ring; an indicator iron core fixedly mounted below the iron core shell, an indicator spring installed between the indicator iron core and the iron core shell; and a guide sleeve fixedly mounted below the indicator iron core. The bottom of the U-shaped yoke is flush with the bottom of the guide sleeve; a yoke ring is also fixedly installed above the guide sleeve; the indicator core, magnetic ring, and yoke ring form a magnetic circuit. Through the magnetic circuit, the position of the moving core can control the position of the magnetic ring, thereby controlling the position movement of the indicator core, realizing a mechanical position indication function. The position of the indicator core and the moving contact are strictly synchronized, unaffected by electromagnetic interference, and can maintain the position of the indicator core even when the power is off. Operators can quickly judge the on / off status of the main circuit visually, effectively avoiding the risk of high-voltage electric shock; at the same time, by utilizing the difference between the working state and the standby state, it is possible to accurately determine whether a sticking fault has occurred in the main circuit, improving the convenience of product fault diagnosis.

[0032] 3. The high-voltage contactor and its usage method disclosed in this invention are provided with a first protrusion at the bottom of the iron core shell, a groove at the top of the indicating iron core, and a second protrusion in the groove. The first protrusion, the groove, and the second protrusion cooperate to limit the movement of the indicating spring, ensuring the stability of the indicating spring during installation and throughout the product's life cycle. At the same time, the indicating spring provides a certain preload to the indicating iron core. The guide sleeve and the indicating spring work together to ensure the relative position of the indicating iron core.

[0033] 4. The high-voltage contactor and its usage method shown in this invention, by setting up a single coil group composed of inner and outer enameled wires to drive two sets of contact mechanisms, reduces one coil and related control components compared to the traditional dual-coil drive structure, significantly reducing system cost; at the same time, the compact structural design makes the overall product size compact, which is conducive to the lightweight and miniaturized integration of new energy equipment. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of a high-voltage DC contactor according to the present invention;

[0035] Figure 2 This is an explosion diagram of a high-voltage DC contactor according to the present invention. Figure 1 ;

[0036] Figure 3 This is an explosion diagram of a high-voltage DC contactor according to the present invention. Figure 2 ;

[0037] Figure 4 This is a three-dimensional structural diagram of a high-voltage DC contactor under working conditions according to the present invention.

[0038] Figure 5 This is a cross-sectional structural diagram of a high-voltage DC contactor under working conditions according to the present invention.

[0039] Figure 6 This is a three-dimensional structural diagram of a high-voltage DC contactor in standby mode according to the present invention;

[0040] Figure 7 This is a cross-sectional view of a high-voltage DC contactor in standby mode according to the present invention.

[0041] Figure 8 This is a three-dimensional structural diagram of the push rod assembly, moving contact piece, and stationary contact in a high-voltage DC contactor according to the present invention.

[0042] Figure 9 This is a schematic diagram of the magnetic circuit of a high-voltage DC contactor according to the present invention;

[0043] Figure 10 This is a three-dimensional structural diagram of the iron core shell in a high-voltage DC contactor according to the present invention;

[0044] Figure 11 This is a three-dimensional structural diagram of the indicator core in a high-voltage DC contactor according to the present invention.

[0045] In the diagram: 1. First isolation plate; 2. Second isolation plate; 3. Stationary contact; 4. First solder piece; 5. Ceramic cover; 6. Second solder piece; 7. Square frame piece; 8. Fixing bracket; 9. Contact spring; 10. Moving contact piece; 11. Bracket; 12. Baffle; 13. Connector; 14. Push rod; 15. Washer; 16. Yoke plate; 17. Stationary iron core; 18. Return spring; 19. Moving iron core; 20. Magnetic ring; 21. 22. Circuit board; 23. Outer ring enameled wire; 24. Guide sleeve; 25. Iron core shell; 26. Mounting component; 27. Fixing component; 28. First fixing component; 29. ​​Second fixing component; 30. Support frame; 31. Coil pin; 32. U-shaped yoke; 33. Yoke ring; 34. Wire; 35. Indicator iron core; 36. Indicator spring; 37. Inner ring enameled wire; 38. First protrusion; 39. Groove. Detailed Implementation

[0046] First, it should be noted that in different described embodiments, the same components are given the same reference numerals or the same component names. The disclosure contained throughout this specification can be applied semantically to the same components having the same reference numerals or the same component names. The location descriptions selected in the specification, such as upper, lower, lateral, etc., also refer to the directly described and illustrated figures and are semantically applied to the new location when the location changes.

[0047] Example 1:

[0048] A high-voltage DC contactor, such as Figure 1-11 As shown, the system includes a ceramic cover 5 and a U-shaped yoke 31. The ceramic cover 5 and the U-shaped yoke 31 are fixedly connected. A stationary contact 3 is fixedly installed on the top of the ceramic cover 5. A movable moving contact 10 is provided below the stationary contact 3. A push rod 14 is fixedly connected below the moving contact 10. A movable indicator core 34 is provided below the push rod 14. The position of the moving contact 10 can be determined by the extension and retraction of the indicator core 34. Maintenance and installation personnel can visually determine whether the entire high-voltage circuit is closed or open by observing the position of the indicator core 34, thus avoiding dangers such as high-voltage electric shock.

[0049] like Figures 2-3 As shown, the ceramic cover 5 is disposed on the top of the high voltage DC contactor. A first isolation plate 1 and a second isolation plate 2 are installed on the top of the ceramic cover 5. Four stationary contacts 3 are provided. The stationary contacts 3 are fixedly installed on the top of the ceramic cover 5 by a first solder piece 4. The first isolation plate 1 and the second isolation plate 2 cooperate to isolate the four stationary contacts 3 to avoid high voltage breakdown and short circuit.

[0050] like Figure 8 As shown, a movable contact piece 10 is installed inside the ceramic cover 5. The movable contact piece 10 is located below the stationary contact 3. A contact spring 9 is fixedly installed below the movable contact piece 10. The other end of the contact spring 9 away from the movable contact piece 10 is connected to a bracket 11. A fixing frame 8 is fixedly installed above the bracket 11. There are two brackets 11, fixing frames 8, and movable contact pieces 10. The two brackets 11 are connected by a connector 13. A push rod 14 is fixedly connected below the connector 13. The fixing frame 8 is located between the two stationary contacts 3 in the width direction. The movable contact piece 10 is located inside the fixing frame 8. The fixing frame 8 restricts the position of the movable contact piece 10 and the contact spring 9, thereby achieving positioning.

[0051] It is worth noting that, such as Figure 8As shown, several baffles 12 are installed between the bracket 11 and the connector 13. The baffles 12 increase the electrical clearance and creepage distance between the high voltage and low voltage, while reducing the component weight while ensuring structural strength.

[0052] like Figures 1-2 , Figure 9 As shown, the ceramic cover 5 and the U-shaped yoke 31 are fixedly connected by the yoke plate 16. The push rod 14 is movably installed in the center of the yoke plate 16 through the washer 15. One end of the push rod is connected to the bracket 11, and the other end extends to the bottom of the yoke plate 16, thus realizing the transfer of position.

[0053] like Figure 9 As shown, a stationary iron core 17 is fixedly installed below the yoke plate 16, and a moving iron core 19 is arranged below the stationary iron core 17. A return spring 18 is arranged between the moving iron core 19 and the stationary iron core 17. The moving iron core 19 and the return spring 18 are located at the bottom of the push rod 14. A magnetic ring 20 is fixedly installed below the moving iron core 19. An iron core shell 24 is fitted around the stationary iron core 17, the moving iron core 19, and the magnetic ring 20. An indicator iron core 34 is fixedly installed below the iron core shell 24, and an indicator spring 35 is installed between the indicator iron core 34 and the iron core shell 24. A guide sleeve 23 is installed below the indicator iron core 34. 3. The bottom of the U-shaped yoke 31 is fixedly installed, and the bottom of the guide sleeve 23 is flush with the bottom of the U-shaped yoke 31. A yoke ring 32 is also fixedly installed above the guide sleeve 23. The indicator core 34, the magnetic ring 20 and the yoke ring 32 form a magnetic circuit. Through the magnetic circuit, the position of the moving core 19 can control the position of the magnetic ring 20, thereby controlling the position movement of the indicator core 34. This realizes the mechanical position indication function. The position of the indicator core 34 is strictly synchronized with the position of the moving contact 10 and is not subject to electromagnetic interference. It can still maintain the position of the indicator core in the power-off state. Operators can quickly judge the on / off status of the main circuit by visual inspection, effectively avoiding the risk of high voltage electric shock.

[0054] like Figure 9 As shown, a coil frame is fixedly installed on the outside of the iron core shell 24. The top of the coil frame is fixedly installed below the yoke plate 16, and the bottom of the coil frame is fixedly installed above the U-shaped yoke 31.

[0055] like Figure 7As shown, the coil frame includes a fixing member 26, a first fixing member 27, a second fixing member 28, and a support frame 29; the fixing member 26 is disposed at the top of the coil frame, the first fixing member 27 is disposed at one end of the coil frame near the fixing member 26; the support frame 29 is disposed at the bottom of the coil frame, the second fixing member 28 is disposed at one end of the coil frame near the support frame 29, and the diameter of the second fixing member 28 is larger than that of the first fixing member 27; the inner wall of the first fixing member 27 is connected to the iron core shell 24, and the inner wall of the second fixing member 28 is connected to the yoke ring 32.

[0056] like Figure 5 As shown, an inner ring enameled wire 36 and an outer ring enameled wire 22 are installed between the fixing member 26 and the support frame 29; the inner ring enameled wire 36 is disposed between the outer ring enameled wire 22 and the second fixing member 28.

[0057] like Figure 9 As shown, several coil pins 30 are fixedly installed on the support frame 29 on one side. The coil pins 30 are connected to the circuit board 21. The inner ring enameled wire 36 and the outer ring enameled wire 22 are wound on the coil frame. The circuit board 21 controls the energization and operation of the two windings to ensure reliable product startup and disconnect a high-power circuit after a certain period of time, thereby reducing the product's holding power consumption. At the same time, the inner ring enameled wire 36 and the outer ring enameled wire 22 form a single coil group to drive two sets of contact mechanisms. Compared with the traditional dual-coil drive structure, it reduces one coil and related control components, significantly reducing system costs. In addition, the compact structural design makes the overall size of the product compact, which is conducive to the lightweight and miniaturized integration of new energy equipment.

[0058] like Figure 9 As shown, a wire 33 is fixedly connected to one side of the circuit board 21. The wire 33 is soldered to the circuit board 21, and the device is powered through the wire 33, which is convenient and quick.

[0059] Furthermore, the magnetic ring 20 is fixedly installed below the moving iron core 19 by magnetic adsorption and epoxy adhesive.

[0060] Furthermore, the iron core shell 24 and the yoke plate 16 are fixedly connected and sealed by laser welding.

[0061] Furthermore, the ceramic cover 5 is fixedly connected and sealed to the square frame 7, the yoke plate 16, and the stationary contact 3 by brazing.

[0062] Furthermore, the connector 13 is made of plastic material. During manufacturing, the push rod 14, the bracket 11, and the connector 13 are integrally molded by injection molding to achieve insulation between high voltage and low voltage.

[0063] It is worth noting that, such as Figures 10-11 As shown, the bottom of the iron core housing 24 is provided with a first protrusion 37, the top of the indicator iron core 34 is provided with a groove 39, and a second protrusion 38 is provided in the groove 39. The first protrusion 37, the groove 39 and the second protrusion 38 cooperate to limit the position of the indicator spring 35, ensuring the stability of the indicator spring 35 during the installation process and throughout the product's life cycle. At the same time, the indicator spring 35 provides a certain preload to the indicator iron core 34. The guide sleeve 23 and the indicator spring 35 work together to ensure the relative position of the indicator iron core 34.

[0064] Example 2:

[0065] This embodiment demonstrates a method for using a high-voltage DC contactor. The high-voltage DC contactor used is the one described in Embodiment 1. Specifically, the high-voltage DC contactor is installed upside down during use. By observing whether the indicator core 34 is exposed on the surface of the guide sleeve 23 and the U-shaped yoke 31, the position of the indicator core 34 is displayed, indicating the usage status and determining whether a sticking fault has occurred in the main circuit. Maintenance and installation personnel can visually determine whether the entire high-voltage circuit is closed or open by observing the position of the indicator core 34, thus avoiding dangers such as high-voltage electric shock.

[0066] like Figure 4-7 As shown, the high-voltage DC contactor has two operating states: standby state and working state. By utilizing the difference between the working state and the standby state, it is possible to accurately determine whether a sticking fault has occurred in the main circuit, thereby improving the convenience of fault diagnosis of the product.

[0067] When the high-voltage DC contactor is in standby mode, the stationary contact 3 and the moving contact 10 are disconnected, the stationary iron core 17 and the moving iron core 19 are disconnected, the magnetic ring 20 is placed below the moving iron core 19, indicating that the iron core 34 moves upward under the magnetic force of the magnetic ring 20 and is close to the surface of the iron core shell 24, indicating that the lower section of the iron core 34 is flush with the guide sleeve 23 and the U-shaped yoke 31, indicating that the iron core 34 does not extend outside the U-shaped yoke 31.

[0068] When the high-voltage DC contactor is in operation, the stationary contact 3 and the moving contact piece 10 are connected, the stationary iron core 17 and the moving iron core 19 are connected, the magnetic ring 20 moves upward with the moving iron core 19, and the indicating iron core 34 moves downward due to the lack of magnetization attraction and the reaction force of the indicating spring 35. The indicating iron core 34 extends out of the guide sleeve 23 and the surface of the U-shaped yoke 31 to realize mechanical main circuit position indication.

[0069] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-voltage DC contactor, characterized in that, It includes a ceramic cover (5) and a U-shaped yoke (31); the ceramic cover (5) and the U-shaped yoke (31) are fixedly connected; a stationary contact (3) is fixedly installed on the top of the ceramic cover (5), a movable moving contact piece (10) is provided below the stationary contact (3), a push rod (14) is fixedly connected below the moving contact piece (10), and a movable indicator core (34) is provided below the push rod (14). The position of the moving contact piece (10) is determined by the position of the indicator core (34).

2. A high-voltage DC contactor according to claim 1, characterized in that: The ceramic cover (5) is equipped with a movable contact piece (10), which is located below the stationary contact (3). A contact spring (9) is fixedly installed below the movable contact piece (10). The other end of the contact spring (9) away from the movable contact piece (10) is connected to a bracket (11), and a push rod (14) is connected below the bracket (11).

3. A high-voltage DC contactor according to claim 2, characterized in that: A fixed frame (8) is fixedly installed above the bracket (11), and the movable contact piece (10) is disposed inside the fixed frame (8). The fixed frame (8) restricts the position of the movable contact piece (10) and the contact spring (9).

4. A high-voltage DC contactor according to claim 1, characterized in that: The ceramic cover (5) and the U-shaped yoke (31) are fixedly connected by the yoke plate (16). The push rod (14) is movably installed on the yoke plate (16), with one end connected to the bracket (11) and the other end extending to the bottom of the yoke plate (16).

5. A high-voltage DC contactor according to claim 4, characterized in that: The stationary iron core (17) is fixedly installed below the yoke plate (16), and a moving iron core (19) is provided below the stationary iron core (17). A return spring (18) is provided between the moving iron core (19) and the stationary iron core (17). The moving iron core (19) and the return spring (18) are located at the bottom of the push rod (14). A magnetic ring (20) is fixedly installed below the moving iron core (19). The stationary iron core (17), the moving iron core (19), and the magnetic ring (20) are all fitted with an iron core shell (24).

6. A high-voltage DC contactor according to claim 5, characterized in that: An indicator core (34) is fixedly installed below the iron core shell (24), and an indicator spring (35) is installed between the indicator core (34) and the iron core shell (24); a guide sleeve (23) is installed below the indicator core (34), and a yoke ring (32) is fixedly installed above the guide sleeve (23); the indicator core (34), the magnetic ring (20), and the yoke ring (32) form a magnetic circuit.

7. A high-voltage DC contactor according to claim 6, characterized in that: The guide sleeve (23) is fixedly installed at the bottom of the U-shaped yoke (31), and the bottom of the guide sleeve (23) is flush with the bottom of the U-shaped yoke (31).

8. A method of using a high-voltage DC contactor, wherein the high-voltage DC contactor is the high-voltage DC contactor as described in claims 1-8, specifically comprising: The high-voltage DC contactor has two operating states: standby state and working state. When the high-voltage DC contactor is in use, it is installed upside down. By observing whether the indicator core (34) is exposed on the bottom surface of the U-shaped yoke (31), the position of the indicator core (34) is displayed, indicating the operating state and the position of the moving contact piece (10), and it is determined whether the main circuit has a sticking fault.

9. The method of using a high-voltage DC contactor according to claim 8, characterized in that: When the high voltage DC contactor is in standby mode, the stationary contact (3) and the moving contact (10) are disconnected, the stationary iron core (17) and the moving iron core (19) are disconnected, the magnetic ring (20) is placed below the moving iron core (19), indicating that the iron core (34) moves upward under the magnetic force of the magnetic ring (20) and is close to the surface of the iron core shell (24), indicating that the lower section of the iron core (34) is flush with the guide sleeve (23) and the U-shaped yoke (31), indicating that the iron core (34) does not extend outside the U-shaped yoke (31).

10. A method of using a high-voltage DC contactor according to claim 8, characterized in that: When the high voltage DC contactor is in working condition, the stationary contact (3) and the moving contact (10) are connected, the stationary iron core (17) and the moving iron core (19) are connected, the magnetic ring (20) moves upward with the moving iron core (19), and the indicator iron core (34) moves downward in the absence of magnetization attraction and the reaction force of the indicator spring (35). The indicator iron core (34) extends out of the guide sleeve (23) and the surface of the U-shaped yoke (31) to realize mechanical main circuit position indication.

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