Bistable high-voltage direct-current contactor capable of improving retention and impact resistance

Abstract

A bistable high-voltage direct-current contactor capable of improving retention and impact resistance comprises a contact system and a driving system which are located in different cavities, and the driving system comprises a coil, a movable iron core, a first static iron core, a push rod, a magnet yoke plate, a U-shaped magnet yoke, a sleeve and magnetic steel or a permanent magnet; the opposite ends of the sleeve and the first static iron core penetrate through the hollow part of the coil and are fixedly and hermetically connected, and the other end of the sleeve is hermetically connected with the magnet yoke plate, so that a sealed cavity is formed among a cavity where the contact system is located, the sleeve and the first static iron core; the magnetic steel or the permanent magnet is arranged between the coil and the magnet yoke plate and located on the outer side of the movable iron core, and the first static iron core is far away from the magnet yoke plate. The movable iron core and the push rod fixed on the movable iron core are positioned in the sleeve; the other end of the push rod penetrates through the magnet yoke plate and is positioned in a chamber where the contact system is positioned; and the driving system is used for opening and closing the contact system. The contactor can be made into a high-voltage product, and meanwhile, through the first static iron core and the magnetic steel or the permanent magnet, the retaining force and the impact resistance are improved.

Description

Technical Field

[0001] This invention relates to the field of high voltage direct current technology, and to a magnetic holding contactor that improves holding force and shock resistance. Background Technology

[0002] High-voltage DC magnetic latching contactors are relatively rare; magnetic latching products are mainly concentrated in low-voltage DC contactors. Because the arc generated when the contact system opens and closes at low voltage is relatively small, it is easily extinguished by air, and the arc does not cause damage such as ablation to the contact system. Therefore, the chamber containing the contact system of a low-voltage DC contactor is a non-sealed chamber. However, when a low-voltage DC contactor is used in a high-voltage environment, due to the increased voltage and current, the arc generated when the contactor opens and closes is relatively large. This arc cannot be extinguished by air, and the resulting arc can cause irreversible ablation to the contact system or even form a sustained arc between the contacts. Therefore, low-voltage DC contactors cannot be used in high-voltage environments, limiting their applicability.

[0003] In addition, conventional contactors provide holding force by energizing the coil when closed, but prolonged continuous energization will cause excessive energy consumption and internal temperature rise; when open, they rely on the spring and the weight of the components themselves to provide holding force, which is relatively small and has poor vibration resistance, making them unsuitable for electric vehicle applications. Summary of the Invention

[0004] The purpose of this invention is to form a sealed chamber by sealing the cavity where the contact system is located and the space where the push rod is displaced, and to increase the holding force in both the closed and open positions, so that the low-voltage DC contactor can be made into a high-voltage product, while improving the holding force and impact resistance.

[0005] To achieve the above objectives, the technical solution of the present invention is a bistable high-voltage DC contactor that can improve holding force and impact resistance, including a contact system and a drive system located in different chambers.

[0006] The contact system includes a stationary contact and a moving contact bridge assembly;

[0007] The drive system includes a coil with a hollow section, a moving iron core, a first stationary iron core, a push rod, a magnetic yoke plate, a U-shaped magnetic yoke, a sleeve, and a magnet or permanent magnet. The U-shaped magnetic yoke is fixedly connected to the magnetic yoke plate. The coil, moving iron core, first stationary iron core, push rod, sleeve, and magnet or permanent magnet are respectively located in the U-shaped magnetic yoke.

[0008] The contact system and the drive system are located on both sides of the magnetic yoke plate, respectively.

[0009] The sleeve and the opposite end of the first static iron core are respectively arranged in the hollow part of the coil from the two ends of the coil and fixedly and sealingly connected, the other end of the sleeve is sealingly connected with the magnetic yoke plate, a sealed chamber is formed between the chamber where the contact system is located, the sleeve and the first static iron core; the magnetic steel or permanent magnet is arranged between the coil and the magnetic yoke plate and outside the moving iron core, the first static iron core is arranged away from the magnetic yoke plate; the moving iron core and the push rod are both located in the sleeve, one end of the push rod is fixedly connected with the moving iron core, the other end of the push rod is located in the chamber where the contact system is located through the magnetic yoke plate, and the moving contact bridge assembly is arranged on the push rod located in the chamber where the contact system is located.

[0010] The driving system drives the moving iron core to displace with the push rod and the moving contact bridge assembly, so as to realize the opening and closing of the contact system.

[0011] Preferably, when the contactor is in the open position, the first static iron core directly attracts the moving iron core.

[0012] Preferably, the magnetic poles of the magnetic steel or permanent magnet are arranged along the displacement direction of the moving iron core.

[0013] Preferably, a magnetic conducting structure is arranged at the magnetic steel or permanent magnet, and the magnetic steel or permanent magnet and the magnetic conducting structure are located outside or inside the sleeve.

[0014] Preferably, the magnetic conducting structure comprises a first magnetic conducting structure, and the first magnetic conducting structure is located between the magnetic steel or permanent magnet and the coil.

[0015] Preferably, a second magnetic conducting structure is further included, the magnetic steel or permanent magnet is located between the first magnetic conducting structure and the second magnetic conducting structure, and the second magnetic conducting structure is located between the magnetic steel or permanent magnet and the magnetic yoke plate.

[0016] Preferably, the magnetic steel or permanent magnet and the first magnetic conducting structure are located between the sleeve and the hollow part of the coil, the second magnetic conducting structure is located outside the sleeve, a second static iron core is arranged in the sleeve, the second static iron core is fixedly arranged on the magnetic yoke plate and located inside the second magnetic conducting structure.

[0017] Preferably, the magnetic steel is in a ring structure.

[0018] Preferably, the outer side surface of the first static iron core is fixedly connected with the U-shaped magnetic yoke.

[0019] Preferably, a sealing cover is sealingly connected to the upper surface of the magnetic yoke plate, the static contact is fixedly and sealingly arranged on the sealing cover, and the end of the static contact in contact with the moving contact bridge assembly is located in the sealing cover.

[0020] Preferably, the sealing chamber formed between the chamber where the contact system is located, the sleeve and the first static core is filled with protective gas.

[0021] The contactor of the present application, by sealingly connecting the sleeve with the first static core, forms a sealing chamber with the sleeve, the first static core and the chamber where the contact system is located, and the sealing chamber can be filled with protective gas to improve the arc extinguishing capability and the protection capability of the contactor in a high voltage environment, so that the contactor can be made into a high voltage and current grade contactor product.

[0022] By arranging the magnetic steel (or permanent magnet) and the first static core at both ends of the coil, the holding force at the closed position and the open position of the contactor is improved, and the impact resistance is improved, so that the stability of the contactor at the closed position and the open position is improved.

[0023] By increasing the second static core, the holding force at the closed position is further improved.

[0024] By arranging the magnetic steel and the second static core, the holding force is improved, and at the same time, the pressure of the contact system at the closed position is increased, so that the contact area between the moving contact bridge and the static contact is increased, and the contact is more closely, so that the contact resistance is reduced.

[0025] By arranging the magnetic poles of the magnetic steel along the displacement direction of the moving core, the adsorption force on the moving core at the closed position is larger, and the response is faster.

[0026] The first static core directly adsorbs the moving core, and no magnetic separation sheet is arranged between the first static core and the moving core, the magnetic conduction between the moving core and the first static core is increased, so that the response during the operation is faster. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a contactor structure schematic diagram in which the first magnetic conduction structure and the magnetic steel are arranged on the outside of the sleeve.

[0028] Figure 2 is a contactor structure schematic diagram in which the first magnetic conduction structure and the magnetic steel are arranged on the inside of the sleeve.

[0029] Figure 3 is a contactor structure schematic diagram in which the second static core and the second magnetic conduction structure are increased.

[0030] REFERENCE NUMERALS

[0031] Static contact 1, moving contact bridge 2, contact spring 3, coil 4, moving core 5, first static core 6, push rod 7, magnetic yoke plate 8, U-shaped magnetic yoke 9, sleeve 10, first magnetic conduction structure 11, magnetic steel 12, sealing cover 13, second static core 14, second magnetic conduction structure 15. DETAILED DESCRIPTION

[0032] The bistable high-voltage direct-current contactor with improved holding force and impact resistance of the application comprises a contact system and a driving system located in different chambers.

[0033] The driving system comprises a coil, a moving iron core, a first static iron core, a push rod, a yoke plate, a U-shaped yoke, a sleeve, a magnetic steel or a permanent magnet, the U-shaped yoke is fixedly connected with the yoke plate, and the coil, the moving iron core, the first static iron core, the push rod, the sleeve and the magnetic steel or the permanent magnet are located in the U-shaped yoke respectively; the contact system and the driving system are located on both sides of the yoke plate respectively.

[0034] The opposite ends of the sleeve and the first static iron core are respectively arranged in the hollow part of the coil from the two ends of the coil and are fixedly and sealingly connected, the other end of the sleeve is sealingly connected with the yoke plate, so that a sealed chamber is formed among the chamber where the contact system is located, the sleeve and the first static iron core; the magnetic steel or the permanent magnet is arranged between the coil and the yoke plate and is located outside the moving iron core, and the first static iron core is arranged away from the yoke plate; the moving iron core and the push rod are both located in the sleeve, one end of the push rod is fixedly connected with the moving iron core, the other end of the push rod passes through the yoke plate and is located in the chamber where the contact system is located, and the moving contact bridge assembly is installed on the push rod.

[0035] The driving system drives the moving iron core to displace with the push rod and the moving contact bridge assembly, so as to realize the opening and closing of the contact system.

[0036] The preferred embodiments are described below in detail with reference to the drawings. The orientation-related terms are only based on the orientation shown in the drawings and do not constitute a limitation on the technical solutions of the application.

[0037] The bistable high-voltage direct-current contactor with improved holding force and impact resistance, as shown in Figure 1 , comprises a contact system and a driving system located in different chambers.

[0038] The contact system comprises a static contact 1 and a moving contact bridge assembly, and the moving contact bridge assembly comprises a moving contact bridge 2 and a contact spring 3.

[0039] The driving system comprises a coil 4, a moving iron core 5, a first static iron core 6, a push rod 7, a yoke plate 8, a U-shaped yoke 9, a sleeve 10, a first magnetic guide structure 11 and a magnetic steel 12; wherein:

[0040] The upper and lower surfaces of the yoke plate 8 are fixedly connected with a sealing cover 13 and the U-shaped yoke 9 respectively, the U-shaped yoke 9 is a barrel-shaped structure and separates the upper and lower sides of the yoke plate 8 into two chambers. The sealing cover 13 is sealingly and fixedly connected with the yoke plate 8. The contact system is located in the chamber formed by the sealing cover 13 and the yoke plate 8, the static contact 1 is fixedly arranged on the sealing cover 13, and the end of the static contact 1 which contacts the moving contact bridge 2 is located in the chamber formed by the sealing cover 13 and the yoke plate 8. The driving system is located in the chamber formed by the yoke plate 8 and the U-shaped yoke.

[0041] The coil 4, the moving iron core 5, the first static iron core 6, one end of the push rod 7, the sleeve 10, the first magnetic conducting structure 11, and the magnetic steel 12 are respectively located in the U-shaped yoke 9. The coil 4 has a hollow portion penetrating through both ends, one end of which is fixedly installed at the bottom of the U-shaped yoke 9, and the other end has a gap reserved between the yoke plate 8. One end of the first static iron core 6 penetrates through the bottom of the U-shaped yoke 9, and the outer side surface of the first static iron core 6 is fixedly connected with the U-shaped yoke 9, and the other end of the first static iron core 6, i.e. the end of the first static iron core 6 facing the yoke plate 8, is arranged in the hollow portion of the coil 4. The first static iron core 6 penetrates through the bottom of the U-shaped yoke 9, and the structure that the side surface of the first static iron core 6 is connected with the U-shaped yoke facilitates assembly.

[0042] The sleeve 10 is a tubular structure penetrating through both ends, and is made of a non-magnetic conducting material. One end of the sleeve 10 is fixedly connected with the yoke plate 8 in a sealed manner, and the other end is arranged in the hollow portion of the coil 4 and fixedly connected with the first static iron core in a sealed manner, such as welding, gluing, or the like. The sealing cover 13, the yoke plate 8, the sleeve 10, and the first static iron core 6 form a sealed chamber, which is helpful to fill protective gas, such as nitrogen, hydrogen, inert gas, or the like, in the formed sealed chamber, to form effective protection in a high-pressure environment. At the same time, the sleeve 10 is sealingly connected with the first static iron core 6, which eliminates the assembly gap between the sleeve 10 and the first static iron core, so that the moving iron core 5 can be directly adsorbed on the first static iron core 6, the gap between the moving iron core and the first static iron core is reduced, the magnetic flux utilization rate is improved, the holding force of the breaking position is improved, and the impact resistance of the product is greatly improved; the breaking distance of the contact system is greatly increased, and the arc extinguishing capacity and breaking capacity are improved.

[0043] The moving iron core 5 is arranged in the hollow portion of the coil 4 and located in the sleeve 10, and the moving iron core 5 is located on the side of the first static iron core 6 facing the yoke plate 8. One end of the push rod 7 is located in the sleeve 10 and fixedly connected with the moving iron core 5, and the other end of the push rod 7 penetrates through the yoke plate 8 and is located in the chamber formed by the yoke plate 8 and the sealing cover. The push rod 7 located in the chamber formed by the yoke plate 8 and the sealing cover is provided with a moving contact bridge assembly.

[0044] The first magnetic conducting structure 11 is annular structure, which is arranged on the upper surface of the one end of the coil 4 facing the yoke plate 8. The magnetic steel 12 is annular structure. The magnetic steel 12 is arranged on the upper surface of the first magnetic conducting structure 11 between the first magnetic conducting structure 11 and the yoke plate 8. The first magnetic conducting structure 11 and the magnetic steel 12 are located at the outer periphery of the moving iron core 5 and the sleeve 10. The magnetic poles (S, N) of the magnetic steel 12 are arranged along the displacement direction of the moving iron core 5. In the embodiment, the magnetic pole S of the magnetic steel 12 is arranged towards the yoke plate 8, and the magnetic pole N is arranged towards the coil 4. By arranging the first magnetic conducting structure, the magnetic conducting effect is strengthened, and the magnetic poles (S, N) of the magnetic steel 12 are arranged along the displacement direction of the moving iron core 5, so that the generated magnetic flux acts on the moving iron core and other components located therein, the acting force is larger, the magnetic conducting effect is better, and the response speed during the operation of the product is faster. In the closed position, the magnetic steel 12 adsorbs the moving iron core 5, improves the holding force at the closed position, and greatly improves the impact resistance of the product. By increasing the magnetic steel 12, the contact pressure between the moving contact bridge 2 and the static contact head 1 is increased, the moving contact bridge 2 and the static contact head 1 are contacted more closely, the contact area is increased, and thus the contact resistance is reduced; and only the coil 4 needs to be energized in the initial stage of closing, and the coil 4 is de-energized after closing, and the magnetic steel or permanent magnet 12 continuously provides the holding force.

[0045] In the stable state after opening, the main magnetic circuit is a closed magnetic conducting loop formed by the U-shaped yoke, the yoke plate, the magnetic steel, the first magnetic conducting structure, the moving iron core and the first static iron core, which provides the holding force in the stable state after opening. In the stable state after closing, the main magnetic circuit is a closed magnetic conducting loop formed by the moving iron core, the yoke plate, the magnetic steel and the first magnetic conducting structure.

[0046] Compared with the conventional or existing contactor scheme, the coil needs to be energized all the time to maintain the stable state, and in the stable state, the main magnetic circuit is a magnetic conducting loop formed by the coil and the air gap (gas) between the yoke; while in the two stable states in the present application, the main magnetic circuit is directly conducted by the components / elements in the product, and the direct conducting effect of the components is better than that of the gas conductor, the magnetic conducting effect is good, and the response speed is faster.

[0047] The working process of the contactor of the present application is as follows:

[0048] In the closed position, the coil 4 is energized in the initial stage of closing, the magnetic force generated by the coil 4 and the magnetic force generated by the magnetic steel 12 jointly act on the moving iron core 5 to overcome the adsorption force of the first static iron core 6 to the moving iron core 5, the moving iron core 5 with the push rod 7 and the moving contact bridge assembly is displaced towards the static contact head 1, the moving contact bridge 2 is contacted with the static contact head 1, the magnetic steel 12 adsorbs the moving iron core 5 to improve the holding force at the closed position, the stable state of the closed position is maintained, and then the coil 4 is de-energized.

[0049] When disconnected, coil 4 is energized in reverse. The combined force of the force exerted by coil 4 on the moving iron core 5, the magnetic force generated by the first stationary iron core 6, the gravity of the moving iron core 5 and push rod 7, and the elastic force of the contact spring 3 is greater than the attraction force of magnet 12. The moving iron core 5, along with push rod 7 and moving contact bridge assembly, moves toward the first stationary iron core 6. When disconnected, the first stationary iron core 6 attracts the moving iron core 5, providing a holding force for the moving iron core at the disconnected position, maintaining the stable state of the disconnected position, and then coil 4 is de-energized.

[0050] In other embodiments, the magnet 12 can also be replaced by a permanent magnet. When replaced by a permanent magnet, multiple permanent magnets can be arranged around the outside of the moving iron core. The magnetic poles of the permanent magnets are arranged in the same way as the magnetic poles of the magnet 12, both along the displacement direction of the moving iron core. One magnetic pole faces the magnetic yoke plate, and the other magnetic pole is away from the magnetic yoke plate. That is, the two magnetic poles are parallel and basically parallel to the displacement direction of the moving iron core.

[0051] Figure 1 In the middle, the first magnetically conductive structure 11 and the magnet 12 are located outside the sleeve 10. In some embodiments, see [reference needed]. Figure 2 The first magnetically conductive structure 11 and the magnet 12 are located inside the sleeve 10 and outside the moving iron core 5. This arrangement, with the first magnetically conductive structure 11, the magnet 12, and the moving iron core 5 all situated within a sealed cavity formed by the first stationary iron core 6, the sleeve 10, the magnetic yoke plate 8, and the sealing cover 13, effectively reduces the gap between the first magnetically conductive structure 11 and the moving iron core 5, improving magnetic flux utilization and increasing magnetic force. Simultaneously, by embedding the first magnetically conductive structure 11 and the magnet 12 within the sleeve 10, the material usage of the first magnetically conductive structure 11 and the magnet 12 is reduced, lowering costs.

[0052] To further improve the holding force in the closed position, a second stationary iron core 14 and a second magnetically conductive structure 15 are added. See also... Figure 3 The coil 4 has a stepped structure at one end facing the hollow portion of the yoke plate 8. A first magnetically conductive structure 11 and a magnet 12 are positioned at the stepped structure of the coil 4 and located outside the sleeve 10. A ring-shaped second magnetically conductive structure 15 is provided at the end of the coil 4 facing the yoke plate 8 and on the magnet 12. The second magnetically conductive structure 15 is located outside the sleeve 10, and the end of the sleeve 10 that is sealed to the yoke plate 8 is located between the second magnetically conductive structure 15 and the yoke plate 8. A second stationary iron core 14 is fixedly installed at the yoke plate 8 within the sleeve 10, and the second stationary iron core 14 is located inside the second magnetically conductive structure 15.

[0053] In the stable state after closure, the main magnetic route is a closed magnetic circuit formed by the moving iron core, the first magnetic guiding structure, the magnet, the second magnetic guiding structure, the second stationary iron core, and the magnetic yoke plate.

[0054] By setting the second magnetic conductive structure 15, the magnetic conductive effect is strengthened. By setting the second static core 14, the side surface of the moving core 5 is adsorbed by the magnetic steel 12, and the end surface of the moving core 5 is adsorbed by the second static core 14, thereby further improving the holding force after closing, improving the short-time withstand current capacity, and keeping the contact system in a more stable state after closing.

Claims

1. A bistable high-voltage DC contactor that improves holding force and impact resistance, characterized in that, This includes contact systems and drive systems located in different chambers. The contact system includes a stationary contact and a moving contact bridge assembly; The drive system includes a coil, a moving iron core, a first stationary iron core, a push rod, a magnetic yoke plate, a U-shaped magnetic yoke, a sleeve, and a magnet or permanent magnet. The U-shaped magnetic yoke is fixedly connected to the magnetic yoke plate, and the coil, moving iron core, first stationary iron core, push rod, sleeve, and magnet or permanent magnet are respectively located in the U-shaped magnetic yoke. The contact system and the drive system are located on both sides of the magnetic yoke plate, respectively. The sleeve and the first stationary iron core are respectively inserted through the two ends of the coil into the hollow part of the coil and are fixedly and sealed. The other end of the sleeve is sealed to the magnetic yoke plate, so that a sealed chamber is formed between the cavity where the contact system is located, the sleeve and the first stationary iron core. The magnet or permanent magnet is disposed between the coil and the magnetic yoke plate and is located outside the moving iron core. The first stationary iron core is disposed away from the magnetic yoke plate. The moving iron core and the push rod are both located in the sleeve. One end of the push rod is fixedly connected to the moving iron core, and the other end passes through the magnetic yoke plate and is located in the cavity where the contact system is located. The moving contact bridge assembly is disposed on the push rod located in the cavity where the contact system is located. The drive system drives the moving iron core to move along with the push rod and the moving contact bridge assembly, thereby opening and closing the contact system.

2. The bistable high-voltage DC contactor according to claim 1, characterized in that, When the contactor is in the open position, the first stationary iron core directly attracts the moving iron core.

3. The bistable high-voltage DC contactor according to claim 1, characterized in that, The magnetic poles of the magnet or permanent magnet are arranged along the displacement direction of the moving iron core.

4. The bistable high-voltage DC contactor according to claim 3, characterized in that, A magnetic guiding structure is provided at the magnet or permanent magnet, and the magnet or permanent magnet and the magnetic guiding structure are located on the outside or inside of the sleeve.

5. The bistable high-voltage DC contactor according to claim 4, characterized in that, The magnetic guiding structure includes a first magnetic guiding structure, which is located between the magnet or permanent magnet and the coil in the displacement direction of the moving iron core.

6. The bistable high-voltage DC contactor according to claim 5, characterized in that, It also includes a second magnetically conductive structure, wherein the magnet or permanent magnet is located between the first magnetically conductive structure and the second magnetically conductive structure, and the second magnetically conductive structure is located between the magnet or permanent magnet and the magnetic yoke plate.

7. The bistable high-voltage DC contactor according to claim 6, characterized in that, The magnet or permanent magnet and the first magnetic conductive structure are located between the sleeve and the hollow part of the coil, and the second magnetic conductive structure is located outside the sleeve; a second stationary iron core is provided in the sleeve, and the second stationary iron core is fixedly arranged on the magnetic yoke plate and located inside the second magnetic conductive structure.

8. The bistable high-voltage DC contactor according to claim 7, characterized in that, The magnet has a ring-shaped structure.

9. The bistable high-voltage DC contactor according to claim 1, characterized in that, The outer surface of the first stationary iron core is fixedly connected to the U-shaped magnetic yoke.

10. The bistable high-voltage DC contactor according to claim 1, characterized in that, A sealing cover is sealed to the magnetic yoke plate, and the stationary contact is fixedly and sealed through the sealing cover. The end of the stationary contact that contacts the moving contact bridge assembly is located in the sealing cover.

11. The bistable high-voltage DC contactor according to claim 10, characterized in that, The sealed chamber formed between the contact system chamber, the sleeve, and the first stationary iron core is filled with protective gas.

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