High-voltage DC contactor with integrated pre-charge circuit on-off control function

Abstract

The present invention discloses a high-voltage DC contactor with an integrated pre-charge circuit on-off control function, comprising: a main contact group, a push rod group, a drive mechanism, and a pre-charge contact group, wherein the pre-charge contact group includes a pre-charge spring fixedly connected to the push rod group and two pre-charge contacts; the drive mechanism includes a movable iron core fixedly connected to the push rod group, two coils for generating a magnetic field to drive the movable iron core to move, a main spring that always applies an elastic force to the movable iron core in a direction opposite to the main contact group, and a pre-charge spring that is not pre-loaded when the contactor is in an initial state; when one of the coils is energized, the movable iron core is moved a first distance by the magnetic field force generated by the coil, and drives the pre-charge spring to abut against the two pre-charge contacts, so that the contactor is maintained in a pre-charge state, that is, the pre-charge contact group is connected and the main contact group is disconnected. By arranging the pre-charge contact group inside the high-voltage DC contactor, the present invention simplifies the system structure and improves the safety and reliability of the high-voltage circuit on-off control.

Description

Technical Field

[0001] The present invention relates to the technical field of contactors, and in particular to a high-voltage DC contactor with an integrated pre-charge circuit on-off control function. Background Art

[0002] With the rapid development of new energy vehicle technology, the safety and reliability of onboard high-voltage systems (such as power battery systems and drive motor systems) have become core research and development directions. As a key actuator in onboard high-voltage systems, high-voltage DC contactors are primarily used to control the on / off state of high-voltage circuits and are essential components for ensuring safe connection and isolation between battery packs and loads. To prevent component damage or safety accidents caused by transient high voltage or high current, a pre-charge circuit must be included in the onboard high-voltage system. This circuit uses pre-charge resistors to limit the charging current, preventing high currents from directly impacting the battery system and effectively protecting the battery pack and power distribution components.

[0003] However, the solutions for realizing the pre-charging function in the prior art have obvious defects: At present, the combination of high-voltage DC contactors and pre-charging circuits mostly adopts a discrete design of "main contactor + independent pre-charging contactor", that is, the main circuit is controlled by the main contactor, and the pre-charging circuit is controlled by a separate pre-charging contactor. This discrete structure requires additional configuration of pre-charging contactors, pre-charging resistors and complex wiring harness connections, which not only increases the complexity of the circuit system and has low system integration, but also takes up more space and increases costs. At the same time, the synergy between the main contactor and the independent pre-charging contactor is difficult to ensure, and problems such as inaccurate pre-charging time control and poor pre-charging effect may occur, affecting the stability and reliability of the entire circuit system. Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide a high-voltage DC contactor with an integrated pre-charging circuit on-off control function, so as to overcome the defects of the existing technology in realizing the pre-charging function, such as complex structure, low integration, inaccurate action timing control and poor reliability.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a high-voltage DC contactor with an integrated pre-charge circuit on-off control function, comprising: a main contact group, a push rod group, a driving mechanism for driving the main contact group to be on and off through the push rod group, and a pre-charge contact group;

[0006] The pre-filled contact group includes a pre-filled spring and two pre-filled contacts, the pre-filled spring is fixedly connected to the push rod group, and the two pre-filled contacts are spaced relative to the pre-filled spring along the movement direction of the push rod group;

[0007] The driving mechanism includes a moving iron core fixedly connected to the push rod group, two coils for generating a magnetic field to drive the moving iron core to move, a main spring that always applies an elastic force to the moving iron core in the direction opposite to the main contact group, and a pre-charge spring without pre-compression when the contactor is in the initial state; when one of the coils is energized, the moving iron core is subjected to the magnetic field force generated by the coil and moves a first distance, and drives the pre-charge spring to abut against the two pre-charge contacts, while compressing the pre-charge spring, and the moving iron core is subjected to the elastic force applied by the main spring and the pre-charge spring so that the contactor is maintained in the pre-charge state, that is, the pre-charge contact group is connected and the main contact group is disconnected; when both of the coils are energized, the moving iron core is subjected to the magnetic field force generated by the two coils and moves a second distance, so that the pre-charge contact group and the main contact group are both connected.

[0008] As a further improvement of the present invention, the push rod group includes a push rod and an insulating base, the upper end of the push rod is fixed to the insulating base, and the lower end of the push rod is fixed to the moving iron core; the pre-charged spring is fixed on the insulating base, and both ends of the pre-charged spring are provided with an extension arm with elastic deformation capability, and the two extension arms are arranged in a one-to-one correspondence with the two pre-charged contacts.

[0009] As a further improvement of the present invention, the insulating base is injection-molded with a plastic material and integrally wraps around the middle portion of the pre-charged spring.

[0010] As a further improvement of the present invention, in the initial state, the distance between the pre-filling spring and the pre-filling contact is smaller than the first distance, and then in the pre-filling state, the pre-filling spring abuts against the two pre-filling contacts so that the two extended arms produce a certain elastic deformation.

[0011] As a further improvement of the present invention, the driving mechanism also includes a static iron core, which is arranged above the moving iron core at intervals, and the main spring and the pre-charge spring are both arranged between the static iron core and the moving iron core, and the second distance is the distance between the static iron core and the moving iron core.

[0012] As a further improvement of the present invention, the pre-charge spring is sleeved on the push rod, and the main spring is sleeved on the pre-charge spring; spring positioning grooves are provided on the end surfaces of the moving iron core and the static iron core facing each other, and the two ends of the main spring are elastically abutted in the two spring positioning grooves respectively.

[0013] As a further improvement of the present invention, one end of the pre-charged spring is fixed in a corresponding one of the spring positioning grooves, and the other end of the pre-charged spring is spaced apart from the other spring positioning groove; or the pre-charged spring is freely placed between the two spring positioning grooves, with no fixed constraints at both ends, and the length of the pre-charged spring in the free state is less than the groove bottom spacing of the two spring positioning grooves.

[0014] As a further improvement of the present invention, the high-voltage DC contactor with integrated pre-charge circuit on-off control function also includes a ceramic cover, and the two pre-charge contacts are welded to the top of the ceramic cover, and one end of each of the two pre-charge contacts extends out of the ceramic cover as a lead-out end, and the other end of each of the two pre-charge contacts extends into the ceramic cover and extends vertically downward from both sides of the push rod group.

[0015] As a further improvement of the present invention, the two coils are respectively a main coil and a pre-charging coil, the main coil and the pre-charging coil are coaxially mounted on each other, and the moving iron core is coaxially arranged in the middle of the main coil and the pre-charging coil; when the pre-charging coil is energized, the moving iron core moves a first distance, and when the main coil and the pre-charging coil are both energized, the moving iron core moves a second distance.

[0016] As a further improvement of the present invention, the middle portion of the pre-charge spring is a pre-charge resistor portion made of a resistance material and having a set resistance value, and the two extension arms are respectively welded to both sides of the pre-charge resistor portion.

[0017] The beneficial effects of the present invention are as follows: the present invention provides a high-voltage DC contactor with an integrated pre-charge circuit on-off control function. By arranging a pre-charge contact group inside the high-voltage DC contactor, the on-off control function of the pre-charge circuit is integrated into the contactor itself, changing the traditional design method of separating the pre-charge circuit from the contactor, thereby greatly simplifying the structure of the entire circuit system, reducing the complexity of wiring, and reducing the space occupied by the independent pre-charge circuit, thereby effectively reducing costs; at the same time, through the ingenious design of the driving mechanism, the magnetic field force generated by the power supply of different coils is combined with the elastic force applied by the main spring and the pre-charge spring to control the movement distance of the moving iron core, thereby realizing precise control of the on-off of the pre-charge contact group and the main contact group, ensuring the orderly connection process of the pre-charge circuit and the main circuit, and improving the stability and reliability of the circuit system; in addition, in the pre-charge state, the two extended arms of the pre-charge spring both produce a certain elastic deformation, thereby ensuring the reliability of the contact between the pre-charge spring and the two pre-charge contacts, and improving the stability of the conduction of the pre-charge circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 A three-dimensional diagram of a high-voltage DC contactor with integrated pre-charge circuit on-off control function according to the present invention;

[0020] Figure 2 A top view of a high-voltage DC contactor with integrated pre-charge circuit on-off control function according to the present invention;

[0021] Figure 3 The contactor of the present invention is in the initial state along Figure 2 Cross-section view in the AA direction;

[0022] Figure 4 The contactor of the present invention is in the initial state along Figure 2 Cross-section in the middle BB direction;

[0023] Figure 5 This is a three-dimensional diagram of the present invention after removing some components of the ceramic cover and the drive mechanism;

[0024] Figure 6 A perspective view of a pre-filled spring according to the present invention;

[0025] Figure 7 is a cross-sectional view of the contactor of the present invention in a pre-charged state;

[0026] Figure 8 It is a cross-sectional view of the contactor of the present invention in the closed state.

[0027] The following description is made with reference to the accompanying drawings:

[0028] 1. Pre-charge spring; 101. Extended arm; 102. Pre-charge resistor; 2. Pre-charge contact; 3. Moving iron core; 4. Main spring; 5. Pre-charge spring; 6. Push rod; 7. Insulating base; 8. Static iron core; 9. Ceramic cover; 10. Main coil; 11. Pre-charge coil; 12. Moving contact piece; 13. Main contact; 14. Support frame; 15. Contact spring; 16. Pole plate; 17. Yoke; 18. Magnetic cylinder; 19. Sleeve; 20. Coil frame. DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0030] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0031] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0032] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples, however, one skilled in the art will appreciate that the examples can be practiced without these specific details.

[0033] The following describes the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0034] See Figures 1 to 8 The present invention provides a high-voltage DC contactor with an integrated pre-charge circuit on-off control function, comprising: a main contact group, a push rod group and a driving mechanism. The main contact group is used to be connected to the main circuit, and the driving mechanism is used to drive the main contact group to be connected or disconnected through the push rod group, thereby realizing on-off control of the main circuit.

[0035] As one of the important improvements of the present invention, the high-voltage DC contactor with integrated pre-charge circuit on-off control function also includes a pre-charge contact group, which is used to connect to the pre-charge circuit. The driving mechanism is also used to drive the pre-charge contact group to be connected or disconnected through the push rod group, thereby realizing the on-off control of the pre-charge contact group.

[0036] See Figure 3 The pre-charge contact assembly includes a pre-charge spring 1 and two pre-charge contacts 2, both made of conductive metal. The pre-charge spring 1 is fixedly connected to the push rod assembly, and when the push rod assembly is actuated, it can synchronously drive the pre-charge spring 1 to move. The two pre-charge contacts 2 are spaced relative to the pre-charge spring 1 along the movement direction of the push rod assembly.

[0037] Furthermore, the driving mechanism includes a moving iron core 3 fixedly connected to the push rod group, two coils for generating a magnetic field to drive the moving iron core 3 to move, a main spring 4 that always applies an elastic force to the moving iron core 3 in the direction away from the main contact group, and a pre-charge spring 5 that has no pre-compression when the contactor is in the initial state.

[0038] The contactor of the present invention has three states:

[0039] Initial state (such as Figure 3 As shown in the figure, that is, both coils are de-energized, the movable iron core 3 is at the starting position of its movement stroke under the elastic force of the main spring 4, and the main contact group and the pre-charge contact group are both disconnected; in the initial state, the movable iron core 3 exerts a certain pre-pressure on the main spring 4, so that the main spring 4 is in a compressed state; while the pre-charge spring 5 has no pre-pressure and is in a natural state.

[0040] Precharge status (such as Figure 7 As shown), that is, when one of the coils is energized, the movable iron core 3 moves upward by a first distance due to the magnetic field force generated by the coil, and drives the pre-charge spring 1 to abut against the two pre-charge contacts 2, so that the pre-charge contact group is connected, and at the same time the pre-charge spring 5 is compressed, while the main contact group remains disconnected; in the pre-charge state, the elastic force exerted by the main spring 4 and the pre-charge spring 5 on the movable iron core 3 is balanced by other forces, so that the contactor remains in the pre-charge state.

[0041] The pull-in state (such as Figure 8 As shown), that is, both coils are energized, and the moving iron core 3 moves upward by a second distance under the force of the magnetic field generated by the two coils, and drives the pre-charge spring 1 to abut against the two pre-charge contacts 2, so that the pre-charge contact group is connected, and at the same time drives the main contact group to be connected.

[0042] It can be understood that in the attracted state, since the magnetic field force generated by the two coils acting on the moving iron core 3 is much greater than the elastic force applied by the main spring 4 and the pre-charge spring 5, the moving iron core 3 can be driven to move upward until the main contact group is closed.

[0043] The present invention integrates the on-off control function of the pre-charging circuit into the contactor itself by arranging a pre-charging contact group inside the high-voltage DC contactor, thereby changing the traditional design method of making the pre-charging circuit independent of the contactor. This greatly simplifies the structure of the entire circuit system, reduces the complexity of wiring, and reduces the space occupied by the independent pre-charging circuit, thereby effectively reducing costs; at the same time, through the ingenious design of the driving mechanism, the magnetic field force generated by the power of different coils is combined with the elastic force exerted by the main spring 4 and the pre-charging spring 5 to control the movement distance of the moving iron core 3, thereby realizing precise control of the on-off of the pre-charging contact group and the main contact group, ensuring the orderly progress of the connection process of the pre-charging circuit and the main circuit, and improving the stability and reliability of the circuit system.

[0044] See Figure 3 and Figure 6 The push rod assembly includes a push rod 6 and an insulating base 7. The upper end of the push rod 6 is fixedly connected to the insulating base 7, and the lower end of the push rod 6 is fixedly connected to the movable iron core 3. The pre-charge spring 1 is fixed to the insulating base 7, and both ends of the pre-charge spring 1 are provided with an elastically deformable extension arm 101. The two extension arms 101 extend outward from the insulating base 7 and are arranged one-to-one with the two pre-charge contacts 2.

[0045] It is worth mentioning that in the initial state, the distance between the pre-filled spring 1 and the pre-filled contact 2 is smaller than the first distance. In the pre-filled state, the two extended arms 101 of the pre-filled spring 1 respectively abut against the two pre-filled contacts 2. Under the stop of the two pre-filled contacts 2, the two extended arms 101 both produce a certain elastic deformation, thereby ensuring the reliability of the contact between the pre-filled spring 1 and the two pre-filled contacts 2, and improving the stability of the conduction of the pre-filled circuit.

[0046] Among them, the insulating base 7 is injection-molded with plastic material and integrally wraps the middle part of the pre-filled spring 1. This one-piece injection molding method can enhance the reliability of the fixation of the pre-filled spring 1, prevent it from displacement during the operation of the contactor, and further improve the performance of the contactor.

[0047] It's worth noting that the center of the pre-charge spring 1 is a pre-charge resistor 102 made of a high-resistance material with a set resistance value. Two extended arms 101 are welded to either side of the pre-charge resistor 102, forming a rigid connection. By providing the pre-charge resistor 102 in the center of the pre-charge spring 1, the present invention replaces the pre-charge resistor in the pre-charge circuit, further improving system integration, reducing the number of distribution components and their wiring harness connections, and thus reducing costs.

[0048] like Figure 4 and Figure 6As shown, a through hole is opened in the middle of the pre-charging resistor part 102, and the upper end of the push rod 6 passes through the through hole and is also integrally injection-molded in the insulating base 7.

[0049] See Figure 3 The driving mechanism also includes a static iron core 8, which is arranged above the moving iron core 3 at intervals, and the main spring 4 and the pre-charge spring 5 are both arranged between the static iron core 8 and the moving iron core 3.

[0050] Among them, the second distance described in this embodiment is the distance between the static iron core 8 and the moving iron core 3. That is to say, when the contactor is in the attracted state, the moving iron core 3 moves upward by the second distance under the action of the magnetic field generated by the two coils, so that the moving iron core 3 is attracted to the bottom of the static iron core 8.

[0051] It can be understood that the second distance described herein is greater than the first distance.

[0052] Furthermore, the pre-charge spring 5 is sleeved on the push rod 6, and the main spring 4 is sleeved on the outside of the pre-charge spring 5. The end surfaces of the moving iron core 3 and the static iron core 8 facing each other are both provided with spring positioning grooves, and the two ends of the main spring 4 are elastically abutted in the two spring positioning grooves. By providing the spring positioning grooves, the present invention can make the installation and positioning of the main spring 4 and the pre-charge spring 5 more precise, ensuring the reliability of the contactor working in the pre-charge state. At the same time, the spring positioning grooves are used to accommodate the main spring 4 and the pre-charge spring 5, avoiding the main spring 4 and the pre-charge spring 5 from hindering the movement of the moving iron core 3.

[0053] In some embodiments of the present invention, one end of the pre-charge spring 5 can be fixed to a corresponding spring positioning slot by welding, bonding, or other methods, while the other end of the pre-charge spring 5 is free. When the contactor is in the initial state, the free end of the pre-charge spring 5 is spaced apart from the other spring positioning slot, thereby achieving the aforementioned non-preloaded pre-charge spring 5. When one of the coils is energized, the movable iron core 3 is moved upward by the magnetic field generated by the coil, causing the free end of the pre-charge spring 5 to abut against the other spring positioning slot. During the subsequent movement, the pre-charge spring 5 is compressed until the movable iron core 3 reaches the first distance. At this point, the movable iron core 3 is subjected to the elastic force exerted by the main spring 4 and the pre-charge spring 5, maintaining the contactor in the pre-charge state.

[0054] Of course, in some other embodiments of the present invention, the pre-charge spring 5 can also be mounted on the push rod 6 and placed freely between the two spring positioning grooves, without fixed constraints at both ends. As long as it is ensured that when the contactor is in the initial state, the length of the pre-charge spring 5 in the free state is less than the distance between the bottoms of the two spring positioning grooves, the purpose of the present invention can also be achieved.

[0055] See Figure 4The driving mechanism of the present invention further includes a magnetic circuit assembly, a sleeve 19 and a coil skeleton 20, which are all prior art. The magnetic circuit assembly includes a magnetic pole plate 16, a yoke 17 and a magnetic tube 18.

[0056] The yoke 17 is U-shaped, and the pole plate 16 is fixedly mounted on top of the yoke 17. The static iron core 8 is fixed to the center hole of the pole plate 16. The lower end of the push rod 6 passes through the static iron core 8 and is fixedly connected to the movable iron core 3. The upper portion of the push rod assembly is located on top of the pole plate 16. The sleeve 19 is cylindrical with an open top and a closed bottom. It is mounted on the movable iron core 3 and the static iron core 8, and the upper end of the sleeve 19 is sealed and welded to the bottom surface of the pole plate 16. The coil bobbin 20 is located within the yoke 17 and is mounted on the outside of the sleeve 19. Both coils are wound around the coil bobbin 20. The magnetic tube 18 is located between the coil bobbin 20 and the sleeve 19. When the coil is energized, the magnetic field it generates can form a magnetic circuit between the yoke 17, the pole plate 16, the static iron core 8, the movable iron core 3, and the magnetic tube 18, thereby enhancing the attraction of the movable iron core 3.

[0057] See Figure 1 The high-voltage DC contactor with integrated pre-charge circuit on-off control function further includes a ceramic cover 9, which is sealed and welded to the magnetic pole plate 16 through a connecting ring.

[0058] In the present invention, the main contact group includes a moving contact piece 12 and two main contacts 13. The two main contacts 13 are welded side by side on the top of the ceramic cover 9, and the lower ends of the two main contacts 13 extend into the interior of the ceramic cover 9 and are distributed with relative intervals above and below the two ends of the moving contact piece 12.

[0059] See Figure 4 and Figure 5 The push rod group in the present invention also includes a support frame 14 and a contact spring 15, both of which are prior art. The support frame 14 is generally made of metal, and its lower end is also integrally injection-molded in the insulating base 7. The moving contact piece 12 is passed through the support frame 14. The contact spring 15 is elastically arranged between the moving contact piece 12 and the insulating base 7. The elastic force exerted by the contact spring 15 on the moving contact piece 12 causes the moving contact piece 12 to be attached to the top wall of the support frame 14.

[0060] See Figure 2 and Figure 3 In this embodiment, the two pre-fill contacts 2 are welded to the top of the ceramic cover 9, and the upper ends of the two pre-fill contacts 2 are flat and extend out of the ceramic cover 9 as lead-out ends; the lower ends of the two pre-fill contacts 2 are rod-shaped and extend into the ceramic cover 9 and extend vertically downward from both sides of the push rod group.

[0061] In the present invention, the two coils are a main coil 10 and a pre-charge coil 11 . The main coil 10 is sleeved outside the pre-charge coil 11 , and the moving iron core 3 is coaxially arranged in the middle of the main coil 10 and the pre-charge coil 11 .

[0062] The working process of the high-voltage DC contactor with integrated pre-charge circuit on-off control function of the present invention is as follows:

[0063] like Figure 3 As shown, the contactor is in the initial state, the main coil 10 and the pre-charge coil 11 are both de-energized, the main spring 4 is in a compressed state, and the pre-charge spring 5 is in a natural state.

[0064] When the pre-charge coil 11 is energized, the moving iron core 3 is acted upon by the magnetic field generated by the pre-charge coil 11, and the pre-charge spring 1 and the moving contact piece 12 are simultaneously driven upward by a first distance, so that the pre-charge spring 1 abuts against the two pre-charge contacts 2, and the pre-charge contact group is connected, that is, the pre-charge circuit is connected, and pre-charging begins. At this time, there is still a certain distance between the moving contact piece 12 and the two main contacts 13, and the main contact group remains disconnected (such as Figure 7 shown).

[0065] When the system feedback pre-charging is completed, the main coil 10 controlled by the circuit board or external circuit of the contactor is also energized, and the moving iron core 3 is simultaneously subjected to the magnetic field force generated by the main coil 10 and the pre-charging coil 11. Since the magnetic field force generated by the main coil 10 and the pre-charging coil 11 on the moving iron core 3 is much greater than the elastic force applied by the main spring 4 and the pre-charging spring 5, the moving iron core 3 can be driven to drive the pre-charging spring 1 and the moving contact piece 12 to continue to move upward until reaching the second distance. At this time, the two extended arms 101 further produce elastic deformation and still maintain connection with the two pre-charging contacts 2. At the same time, the moving contact piece 12 is connected with the two main contacts 13, that is, the main contact group is connected, and the main circuit is connected (such as Figure 8 shown).

[0066] When both the main coil 10 and the pre-charge coil 11 are powered off, under the elastic force of the main spring 4, the pre-charge spring 5, the contact spring 15 and the pre-charge spring 1, the moving iron core 3 drives the pre-charge spring 1 and the moving contact piece 12 to return to their initial positions.

[0067] It can be seen that the present invention provides a high-voltage DC contactor with an integrated pre-charge circuit on-off control function. By arranging a pre-charge contact group inside the high-voltage DC contactor, the on-off control function of the pre-charge circuit is integrated into the contactor itself, which changes the traditional design method of making the pre-charge circuit independent of the contactor. This greatly simplifies the structure of the entire circuit system, reduces the complexity of wiring, and reduces the space occupied by the independent pre-charge circuit, thereby effectively reducing the cost; at the same time, through the ingenious design of the driving mechanism, the magnetic field force generated by the power of different coils is combined with the elastic force applied by the main spring 4 and the pre-charge spring 5 to control the movement distance of the moving iron core 3, thereby realizing precise control of the on-off of the pre-charge contact group and the main contact group, ensuring the orderly connection process of the pre-charge circuit and the main circuit, and improving the stability and reliability of the circuit system; in addition, in the pre-charge state, the two extended arms 101 of the pre-charge spring 1 both produce a certain elastic deformation, thereby ensuring the reliability of the contact between the pre-charge spring 1 and the two pre-charge contacts 2, and improving the stability of the conduction of the pre-charge circuit.

[0068] The same or similar parts between the various embodiments in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0069] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A high-voltage DC contactor with integrated pre-charge circuit on-off control function, comprising a main contact group, a push rod group, and a drive mechanism for driving the main contact group to be on and off via the push rod group, characterized in that: Also included is a pre-charged contact set; wherein: The pre-filling contact group comprises a pre-filling spring (1) and two pre-filling contacts (2), wherein the pre-filling spring (1) is fixedly connected to the push rod group, and the two pre-filling contacts (2) are spaced relative to the pre-filling spring (1) along the movement direction of the push rod group; The driving mechanism comprises a moving iron core (3) fixedly connected to the push rod group, two coils for generating a magnetic field to drive the moving iron core (3) to move, a main spring (4) that always applies an elastic force to the moving iron core (3) in a direction opposite to the main contact group, and a pre-charge spring (5) without pre-compression when the contactor is in an initial state; when one of the coils is energized, the moving iron core (3) is subjected to the magnetic field force generated by the coil and moves a first distance, and drives the pre-charge spring (1) to abut against the two pre-charge contacts (2), while compressing the pre-charge spring (5), and the moving iron core (3) is subjected to the elastic force jointly applied by the main spring (4) and the pre-charge spring (5) so that the contactor is maintained in a pre-charge state, that is, the pre-charge contact group is connected and the main contact group is disconnected; when both of the coils are energized, the moving iron core (3) is subjected to the magnetic field force jointly generated by the two coils and moves a second distance, so that the pre-charge contact group and the main contact group are both connected; The push rod group comprises a push rod (6) and an insulating base (7), the upper end of the push rod (6) is fixed to the insulating base (7), and the lower end of the push rod (6) is fixed to the moving iron core (3); the pre-charge spring (1) is fixed to the insulating base (7), and both ends of the pre-charge spring (1) are provided with extension arms (101) with elastic deformation capability, and the two extension arms (101) are arranged in a one-to-one correspondence with the two pre-charge contacts (2); in the initial state, the distance between the pre-charge spring (1) and the pre-charge contacts (2) is smaller than the first distance, and then in the pre-charge state, the pre-charge spring (1) abuts against the two pre-charge contacts (2), so that the two extension arms (101) generate a certain elastic deformation; The two coils are respectively a main coil (10) and a pre-charge coil (11); the main coil (10) and the pre-charge coil (11) are coaxially mounted on each other; the moving iron core (3) is coaxially arranged in the middle of the main coil (10) and the pre-charge coil (11); when the pre-charge coil (11) is energized, the moving iron core (3) moves a first distance; when both the main coil (10) and the pre-charge coil (11) are energized, the moving iron core (3) moves a second distance.

2. The high-voltage DC contactor with integrated pre-charge circuit on-off control function according to claim 1 is characterized in that: The insulating base (7) is injection-molded from a plastic material and integrally wraps around the middle portion of the pre-filled spring (1).

3. The high-voltage DC contactor with integrated pre-charge circuit on-off control function according to claim 1, characterized in that: The driving mechanism further comprises a static iron core (8), wherein the static iron core (8) is arranged above the moving iron core (3) at intervals, the main spring (4) and the pre-charge spring (5) are both arranged between the static iron core (8) and the moving iron core (3), and the second distance is the spacing between the static iron core (8) and the moving iron core (3).

4. The high-voltage DC contactor with integrated pre-charge circuit on-off control function according to claim 3, characterized in that: The pre-charge spring (5) is sleeved on the push rod (6), and the main spring (4) is sleeved on the pre-charge spring (5); spring positioning grooves are provided on the end surfaces of the movable iron core (3) and the static iron core (8) facing each other, and the two ends of the main spring (4) are elastically abutted in the two spring positioning grooves respectively.

5. The high-voltage DC contactor with integrated pre-charge circuit on-off control function according to claim 4, characterized in that: One end of the pre-fill spring (5) is fixed in a corresponding spring positioning groove, and the other end of the pre-fill spring (5) is spaced apart from another spring positioning groove; Alternatively, the pre-fill spring (5) is freely placed between the two spring positioning grooves, with no fixed constraints at both ends, and the length of the pre-fill spring (5) in a free state is less than the distance between the bottoms of the two spring positioning grooves.

6. The high-voltage DC contactor with integrated pre-charge circuit on-off control function according to claim 1, characterized in that: It also includes a ceramic cover (9), the two pre-filled contacts (2) are welded to the top of the ceramic cover (9), one end of each of the two pre-filled contacts (2) is extended out of the ceramic cover (9) as a lead-out end, and the other end of each of the two pre-filled contacts (2) is extended into the ceramic cover (9) and extends vertically downward from both sides of the push rod group.

7. The high-voltage DC contactor with integrated pre-charge circuit on-off control function according to claim 1, characterized in that: The middle portion of the pre-charge spring (1) is a pre-charge resistor portion (102) made of a resistance material and having a set resistance value, and the two extended arm portions (101) are respectively welded to two sides of the pre-charge resistor portion (102).

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