DC contactor

Abstract

The utility model provides a direct current contactor. The direct current contactor comprises a contact module, the contact module comprises a contact assembly, a moving contact bridge assembly and a push rod assembly, the moving contact bridge assembly is connected with the push rod assembly, and the push rod assembly is used for pushing the moving contact bridge assembly to make contact with the contact assembly; the movable contact bridge assembly comprises at least two movable contact springs, at least two first magnetizers and a second magnetizer, the first magnetizers and the second magnetizers are arranged on the two sides of the movable contact springs respectively, the two first magnetizers make contact with the second magnetizers, and the two ends of the movable contact springs in the length direction make contact with the contact assembly respectively; each first magnetizer and the corresponding second magnetizer form an independent magnetic conductive loop, and the sides, away from the second magnetizers, of the two first magnetizers abut against the push rod assembly. According to the direct current contactor, through the arrangement of the movable contact bridge assembly, the direct current contactor can meet the miniaturization requirement, the magnetic conduction area can be increased, the electric repulsive force can be reduced, and therefore the electric repulsive force resisting capacity is improved.

Description

Technical Field

[0001] The present application relates to the technical field of relays, and in particular to a DC contactor. Background Art

[0002] In the related art, the DC contactor adopts a direct-acting magnetic circuit structure. Under the action of the direct-acting magnetic circuit, the dynamic and static contacts are brought into contact, thereby connecting the load. When a short-circuit current flows through the DC contactor, an electromotive force of repulsion is generated between the dynamic and static contacts, thereby affecting the stability of the contact between the dynamic and static contacts. Although the related art adopts the method of increasing the magnetic conductive area to balance the electromotive force of repulsion, the DC contactor is limited by its miniaturization, resulting in a limited increase in the magnetic conductive area of ​​the DC contactor. When the short-circuit current is large, the electromotive force of repulsion between the dynamic and static contacts cannot be balanced, and there is still a risk of unstable contact between the dynamic and static contacts. Utility Model Content

[0003] In view of this, the present application provides a DC contactor to improve the problem of unstable contact between the moving and static contacts due to short-circuit current while meeting the requirement of miniaturization.

[0004] The technical solutions adopted by this application to solve the above technical problems are:

[0005] An embodiment of the present application provides a DC contactor, comprising a contact module, wherein the contact module comprises: a contact assembly, a movable contact bridge assembly, and a push rod assembly, wherein the movable contact bridge assembly is connected to the push rod assembly, and the push rod assembly is used to push the movable contact bridge assembly into contact with the contact assembly;

[0006] In which, the dynamic contact bridge assembly includes at least two dynamic springs, at least two first magnetic conductors and one second magnetic conductor. The first magnetic conductor and the second magnetic conductor are respectively arranged on the upper and lower sides of the dynamic spring, and the two first magnetic conductors are in contact with the second magnetic conductor, and one first magnetic conductor is in contact with one dynamic spring. Both ends of the dynamic spring in the length direction are in contact with the contact assembly, each first magnetic conductor and the second magnetic conductor form an independent magnetic circuit, and the two first magnetic conductors are in contact with the push rod assembly on the side facing away from the second magnetic conductor.

[0007] In some embodiments of the present application, the movable spring piece includes a middle portion and two side portions. Along the length direction of the movable spring piece, the two side portions are respectively connected to the two sides of the middle portion. Along the width direction of the movable spring piece, the side portions and the middle portion are staggered. The two side portions and the middle portion jointly define an avoidance gap. The first magnetic conductor surrounds the middle portion on both sides in the width direction and one side of the first magnetic conductor is located in the avoidance gap. The second magnetic conductor is arranged on the middle portion and contacts with the first magnetic conductor to form a magnetic circuit.

[0008] In some embodiments of the present application, the cross-sectional shape of the first magnetic conductor in the longitudinal direction is U-shaped, the middle portion is located in the groove of the first magnetic conductor, and the second magnetic conductor contacts both ends of the first magnetic conductor.

[0009] In some embodiments of the present application, the two movable spring pieces are spaced apart along the width direction, and the limiting notches of the two movable spring pieces are arranged opposite to each other.

[0010] In some embodiments of the present application, the contact assembly includes a first main contact and a second main contact, the first main contact and the second main contact are arranged opposite to each other along the length direction of the movable spring piece, and the first main contact and the second main contact each have two static contacts, the two static contacts of the first main contact respectively contact with one end of the two movable spring pieces, and the two static contacts of the second main contact respectively contact with the other end of the two movable spring pieces.

[0011] In some embodiments of the present application, the two static contacts of the first main contact are spaced apart, and a spacing groove is formed between the two static contacts of the first main contact.

[0012] In some embodiments of the present application, the first main contact and the second main contact have opposite electrical properties, and the two magnetic conductive loops formed by the two first magnetic conductive bodies and the second magnetic conductive bodies have the same direction.

[0013] In some embodiments of the present application, the dynamic contact bridge assembly includes multiple magnetic conductive groups, each of the magnetic conductive groups includes two dynamic springs, two first magnetic conductive bodies and one second magnetic conductive body, the two dynamic springs, two first magnetic conductive bodies and one second magnetic conductive body together form two magnetic conductive circuits, and the multiple magnetic conductive groups are arranged at intervals along the width direction of the dynamic spring.

[0014] In some embodiments of the present application, the push rod assembly includes a push rod, a spring seat and a pressure spring, the pushing end of the push rod is connected to the spring seat, the pressure spring is arranged on the spring seat, and the end of the pressure spring facing away from the spring seat is in contact with the two first magnetic conductors.

[0015] In some embodiments of the present application, the number of the pressure springs is at least two, the number of the pressure springs contacted by each first magnetic conductor is the same, and the multiple pressure springs are independently arranged.

[0016] In summary, the DC contactor provided by the embodiment of the present application utilizes a push rod assembly to push the movable contact bridge assembly to achieve contact and coordination between the movable contact bridge assembly and the contact assembly, and utilizes at least two first magnetic conductors, at least two movable springs, and a second magnetic conductor in the movable contact bridge assembly to form at least two independent magnetic conductive circuits, thereby increasing the magnetic conductive area. The two magnetic conductive circuits formed by the two first magnetic conductors and the two movable springs are independent of each other, thereby effectively avoiding the large difference in the compensating electromagnetic force between the two magnetic conductive circuits caused by sharing the movable springs or sharing the first magnetic conductor, and further exacerbating the electromagnetic force difference under the influence of the electromotive repulsive force, resulting in the risk of deterioration of the short-circuit current resistance performance of the DC contactor. In detail, first, by utilizing the coordination of the contact assembly, the movable contact bridge assembly, and the push rod assembly, the DC contactor is energized to perform the function of conducting the load; then, by improving the structure of the movable contact bridge assembly, specifically, the movable contact bridge assembly includes at least two movable springs, at least two first magnetic conductors, and a second magnetic conductor. By placing a first magnetic conductor corresponding to a movable spring, and by contacting the first magnetic conductor with the second magnetic conductor, the first and second magnetic conductors can form a circuit. Furthermore, by contacting the movable spring with the contact assembly, current can flow through the movable spring, thereby forming an electromagnetic circuit between the first and second magnetic conductors, generating an electromagnetic force. This electromagnetic force can effectively resist the electromotive force generated by the short-circuit current, preventing the movable spring and the contact assembly from being repelled and separated due to the electromotive force. Furthermore, the movable contact bridge assembly forms at least two electromagnetic circuits, effectively increasing the magnetic conductive area and thus the electromagnetic force, which can effectively adapt to the electromotive force caused by large short-circuit currents. Furthermore, the two electromagnetic circuits formed are formed by two independent movable springs and two first magnetic conductors, making them independent electromagnetic circuits. Compared with a shared movable spring or first magnetic conductor, this effectively eliminates the risk of a large difference in the magnetic conductive area of ​​the two electromagnetic circuits due to the tilt of one of the movable springs or first magnetic conductors, which can lead to deterioration of the short-circuit current resistance performance or even complete failure. Furthermore, when the same short-circuit current passes through a dynamic contact bridge assembly containing two or more independently arranged dynamic springs, the current is equally divided, reducing the electric repulsion of a single circuit and thus reducing the electric repulsion of the entire circuit. Combined with the electromagnetic force increase brought about by the two or more electromagnetic circuits formed by the contact bridge assembly, the short-circuit resistance of the product is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1A schematic structural diagram of a DC contactor provided in an embodiment of the present application;

[0018] Figure 2 A cross-sectional schematic diagram (first perspective) of a DC contactor provided in an embodiment of the present application;

[0019] Figure 3 A cross-sectional schematic diagram of a DC contactor provided in an embodiment of the present application (second perspective);

[0020] Figure 4 for Figure 1 Explosion diagram of

[0021] Figure 5 A schematic structural diagram of a contact module in a DC contactor provided in an embodiment of the present application (first perspective);

[0022] Figure 6 A schematic structural diagram of a contact module in a DC contactor provided in an embodiment of the present application (second perspective);

[0023] Figure 7 for Figure 5 Explosion diagram of

[0024] Figure 8 A schematic structural diagram of another contact module in a DC contactor provided in an embodiment of the present application (second perspective);

[0025] Figure 9 for Figure 8 Explosion diagram of

[0026] Figure 10 A schematic structural diagram of another contact module in a DC contactor provided in an embodiment of the present application (second perspective);

[0027] Figure 11 for Figure 10 Explosion diagram of

[0028] Figure 12 for Figure 10 A schematic diagram of the structure of the dynamic contact bridge assembly and the push rod assembly of the contact module provided in;

[0029] Figure 13 for Figure 12 Explosion diagram of

[0030] Figure 14 A schematic structural diagram of the cooperation between a movable spring and a first magnetic conductor in a DC contactor provided in an embodiment of the present application;

[0031] Figure 15A schematic structural diagram of a moving spring in a DC contactor provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 100, housing; 200, circuit module; 300, auxiliary copper busbar; 400, magnet kit; 500, contact module; 510, contact assembly; 511, first main contact; 5111, spacing groove; 512, second main contact; 520, moving contact bridge assembly; 521, moving spring; 5211, middle part; 5212, side part; 5213, avoidance gap; 522, first magnetic conductor; 523, second magnetic conductor; 5231, Positioning protrusion; 530, push rod assembly; 531, push rod; 532, spring seat; 5321, limit protrusion; 533, pressure spring; 540, bracket; 541, positioning hole; 550, auxiliary contact box; 560, auxiliary contact; 570, magnetic conductive plate; 580, fixing pin; 590, reset spring; 591, moving iron core; 592, sleeve; 600, coil; 700, yoke kit; 800, bottom cover; 900, connector. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0035] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0036] This application uses specific terms to describe the embodiments of this application. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a certain feature, structure, or characteristic associated with at least one embodiment of this application. Therefore, it should be emphasized and noted that "one embodiment," "an embodiment," or "an alternative embodiment" mentioned twice or multiple times in different locations in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application may be appropriately combined.

[0037] See Figures 1 to 4An embodiment of the present application provides a DC contactor, comprising a housing 100, a circuit module 200, an auxiliary copper busbar 300, a magnet kit 400, a contact module 500, a coil 600, a yoke kit 700, a bottom cover 800, and a connector 900. A portion of the contact module is connected to the coil 600, and the coil 600, together with a portion of the contact module connected thereto, is fixed in the yoke kit 700. The yoke kit 700 is U-shaped, and the coil 600 is riveted into the U-shaped groove of the yoke kit 700. The yoke kit 700 is fixed to the bottom cover 800. The contact module has a contact assembly 510 on the side facing away from the yoke kit 700, and the contact assembly 510 is used to receive current. The contact assembly 510 is sleeved in a preset hole of the auxiliary copper busbar 300 and welded to conduct current to the contact assembly 510. The magnet assembly 400 surrounds the side of the contact module 500. The circuit module 200, auxiliary copper busbar 300, and coil 600 are all welded together. The housing 100 and bottom cover 800 are combined and fixed together, so that the circuit module 200, auxiliary copper busbar 300, magnet assembly 400, contact module 500, coil 600, and yoke assembly 700 are all placed within the installation space defined by the housing 100 and bottom cover 800. The connector 900 is fixed to the housing 100 and is primarily used to connect a power supply or other load.

[0038] The magnet assembly 400 includes two mounting brackets and two magnets. The mounting brackets are positioned opposite each other and clamped to the sides of the contact module 500. The magnets are fixed to the inner sides of the mounting brackets, one magnet fixed to the inner side of each mounting bracket. The two magnets are positioned opposite each other and have opposite magnetic properties. When the mounting brackets are clamped to the sides of the contact module 500, the magnets adhere to the sides of the contact module 500.

[0039] See Figures 5 to 7 The contact module 500 includes a contact assembly 510, a movable contact bridge assembly 520, and a push rod assembly 530. The movable contact bridge assembly 520 is connected to the push rod assembly 530, and the push rod assembly 530 is used to push the movable contact bridge assembly 520 to contact the contact assembly 510.

[0040] Among them, the dynamic contact bridge assembly 520 includes at least two dynamic springs 521, at least two first magnets 522 and a second magnet 523. Along the linear direction of the force of the push rod assembly 530, the first magnet 522 and the second magnet 523 are respectively arranged on both sides of the dynamic spring 521. The two first magnets 522 are in contact with the second magnet 523, and one first magnet 522 is corresponding to one dynamic spring 521. The two ends of the dynamic spring 521 in the length direction are respectively in contact with the contact assembly 510. Each first magnet 522 and the second magnet 523 form an independent magnetic circuit, and the side of the two first magnets 522 facing away from the second magnet 523 is in contact with the push rod assembly 530.

[0041] The movable contact bridge assembly 520 includes at least two movable springs 521, each connected to the contact assembly 510 at either end. A push rod assembly 530 is connected to the movable contact bridge assembly 520 and applies force to bring the movable springs 521 into contact with or disconnect from the contact assembly 510, thereby switching the current. The movable springs 521 in the movable contact bridge assembly 520 are designed to withstand short-circuit currents. The design of the movable springs 521 forms at least two magnetic circuits by providing a first magnetic conductor 522 and a second magnetic conductor 523. Each movable spring 521 is flanked by a first magnetic conductor 522 and a second magnetic conductor 523, respectively, and its two ends contact the contact assembly 510. When the push rod assembly 530 pushes the movable springs 521, the short-circuit current is conducted through the movable springs 521. The magnetic conductors on either side of the movable spring 521 divide the short-circuit current into multiple magnetic circuits, thereby reducing the electromotive force of a single magnetic circuit. Along the action direction of the push rod assembly 530, the first magnetic conductor 522 and the second magnetic conductor 523 are arranged in back-to-back relationship to form an independent magnetic conductive loop. This design can ensure that the short-circuit current will not be concentrated in a single magnetic conductive loop when passing through the contactor.

[0042] The movable spring 521 in the movable contact bridge assembly 520 is designed to have a first magnet 522 and a second magnet 523 on both sides. The first magnet 522 contacts the second magnet 523 to form an independent magnetic circuit. The push rod assembly 530 applies a constant force through the pressure spring 533 to ensure that the contact pressure between the movable spring 521 and the static contact is evenly distributed. The direction of the magnetic flux in each magnetic circuit is opposite to the direction of the electric repulsion. The attraction generated by the magnetic circuit and the electric repulsion generated by the short-circuit current offset each other, reducing the risk of contact separation. The magnetic circuit formed by each first magnet 522 and the second magnet 523 ensures that the short-circuit current will not be concentrated on a single magnetic path. The contact point between the first magnet 522 and the second magnet 523 effectively shares the electric repulsion generated by the short-circuit current, further improving the stability of the contactor in high-current scenarios.

[0043] When current flows through the contactor, the push rod assembly 530 pushes the movable spring 521, causing its two ends to contact the static contacts of the contact assembly 510. Current enters the movable spring 521 from the two static contacts of the first main contact 511, passes through the movable spring 521, and then enters the two static contacts of the second main contact 512. The two static contacts of each main contact are connected to the two ends of the movable spring 521. When a short-circuit current occurs, the magnetic conductors of the movable spring 521 shunt the short-circuit current into multiple magnetic conductive loops, thereby reducing the current pressure on a single loop and enhancing the short-circuit current resistance capability.

[0044] The technical solution provided in the present application utilizes the push rod assembly 530 to push the moving contact bridge assembly 520 to achieve contact and cooperation between the moving contact bridge assembly 520 and the contact assembly 510, and utilizes at least two first magnets 522, at least two moving springs 521 and a second magnet 523 in the moving contact bridge assembly 520 to form at least two independent magnetic circuits, thereby achieving the purpose of increasing the magnetic area, and the two magnetic circuits formed by the two first magnets 522 and the two moving springs 521 are independent of each other, thereby effectively avoiding a large difference in the compensating electromagnetic force of the two magnetic circuits due to sharing the moving spring 521 or the first magnet 522, and further aggravating the electromagnetic force difference under the influence of the electric repulsion, resulting in the risk of deterioration of the short-circuit current resistance performance of the DC contactor. In detail, first, by utilizing the cooperation of the contact assembly 510, the moving contact bridge assembly 520 and the push rod assembly 530, the DC contactor is energized to conduct the load; then, the structure of the moving contact bridge assembly 520 is improved. Specifically, the moving contact bridge assembly 520 includes at least two moving springs 521, at least two first magnetic conductors 522 and a second magnetic conductor 523. By positioning a first magnetic conductor 522 corresponding to a movable spring 521 and contacting the first magnetic conductor 522 with the second magnetic conductor 523, the first magnetic conductor 522 and the second magnetic conductor 523 form a circuit. Furthermore, by contacting the movable spring 521 with the contact assembly 510, current flows through the movable spring 521, thereby forming an electromagnetic circuit between the first magnetic conductor 522 and the second magnetic conductor 523, generating an electromagnetic force. This electromagnetic force effectively counteracts the electromotive force generated by the short-circuit current, preventing the movable spring 521 from being repelled and separated from the contact assembly 510 due to the electromotive force. Furthermore, the movable contact bridge assembly 520 forms at least two electromagnetic circuits, effectively increasing the magnetic conductive area and thus the electromagnetic force, which can effectively adapt to the electromotive force caused by large short-circuit currents. Furthermore, the two electromagnetic circuits are formed by two independent movable springs 521 and two first magnetic conductors 522, making the electromagnetic circuits independent electromagnetic circuits. Compared with a shared movable spring 521 or first magnetic conductor 522, the electromagnetic circuits can effectively eliminate the risk of a large difference in the magnetic conductive areas of the two electromagnetic circuits due to the tilt of one of the movable springs 521 or the first magnetic conductor 522, which in turn leads to degradation of the short-circuit current resistance performance or even complete failure.

[0045] In some embodiments, see Figure 7 、 Figure 12 as well as Figure 13The movable spring 521 in the movable contact bridge assembly 520 includes a middle portion 5211 and two side portions 5212 along its length. The middle portion 5211 is the main body of the movable spring 521, and the two side portions 5212 are connected to either side of the middle portion 5211 to form a support structure. The middle portion 5211 and the side portions 5212 are staggered vertically along the width direction. A clearance gap 5213 is formed between the side portions 5212 and the middle portion 5211 of the movable spring 521. This clearance gap 5213 provides space for the arrangement of the first magnetic conductor 522, allowing the first magnetic conductor 522 to surround the middle portion 5211. At the same time, in the width direction, the first magnetic conductor 522 and the second magnetic conductor 523 are in contact, forming a complete magnetic circuit. The presence of this clearance gap 5213 allows the magnetic conductors to be more tightly and rationally arranged around the movable spring 521, thereby improving the magnetic conductivity.

[0046] The first magnet 522 has a U-shaped structure, with its groove portion covering both sides of the middle portion 5211 of the movable spring 521, and the two ends of the U-shape are in contact with the second magnet 523, forming an independent magnetic conductive circuit. Through its U-shaped structure, the first magnet 522 forms a symmetrical magnetic conductive circuit on both sides of the movable spring 521. One side of the first magnet 522 is located within the avoidance gap 5213 of the movable spring 521, allowing the magnet to achieve a stable magnetic field distribution without increasing the thickness and width of the movable spring 521. The second magnet 523 is arranged above the middle portion 5211 of the movable spring 521 and contacts the U-shaped first magnet 522, forming an independent closed magnetic conductive circuit. When a short-circuit current passes through, the contact between the magnets forms a magnetic field, and the generated attraction resists the electromotive repulsive force.

[0047] In some embodiments, the two movable springs 521 are spaced apart along their width, and the retaining notches of the two movable springs 521 are positioned toward each other. By spacing the two movable springs 521 apart, current interference caused by contact between the two movable springs 521 is avoided. Furthermore, by positioning the retaining notches of the two movable springs 521 toward each other, a portion of the first magnetic conductor 522 can be positioned within the retaining notch, and a portion of the second magnetic conductor 523 can be positioned within the retaining notch of the other movable spring 521. Furthermore, the portions of the two magnetic conductors positioned within the retaining notches are positioned close together, which helps to reduce the width of the movable springs 521 in the width direction, thereby reducing the volume of the contact module 500 and improving the structural compactness. For ease of understanding, as shown in the comparative example: the limiting notches of the two movable spring pieces 521 are set back to back, one end of the first magnetic conductor 522 is set in the limiting notch, and the other end is located between the two movable spring pieces 521, so that there will be a thickness of the side edges of the two magnetic conductors between the two movable spring pieces 521, which will lead to an increase in the width of the two magnetic conductors and the two movable spring pieces 521 in the width direction.

[0048] It should be noted that the middle portion 5211 of one of the movable spring pieces 521 is arranged in the U-shaped groove of a first magnet 522, and the second magnet 523 is arranged on the movable spring piece 521 and contacts the U-shaped ends of the first magnet 522, so that the first magnet 522 and the second magnet 523 can form a loop; correspondingly, the middle portion 5211 of the other movable spring piece 521 is arranged in the U-shaped groove of another first magnet 522, and the second magnet 523 is also arranged on the movable spring piece 521 and contacts the U-shaped ends of the first magnet 522, so that the first magnet 522 and the second magnet 523 can also form a loop. The two side portions 5212 of the movable spring 521 can contact the contact assembly 510, so that the current derived from the contact assembly 510 can flow through the movable spring 521, so that the two side portions 5212 of the movable spring 521 have opposite electrical properties, and then two magnetic circuits with the same direction are formed between the two first magnetic conductors 522 and the second magnetic conductors 523 respectively. The electromagnetic force generated by the magnetic circuit is opposite to the direction of the electromotive repulsive force, thereby balancing or even exceeding the electromotive repulsive force, ensuring that the movable spring 521 is always in contact with the contact assembly 510.

[0049] In some embodiments, see Figure 14 and Figure 15 Grooves are provided on both the front and back surfaces of the movable spring piece 521, which are beneficial to reducing the weight of the movable spring piece 521. The grooves are located between the middle portion 5211 and the side portion 5212. When the static contact contacts the side portion 5212 of the movable spring piece 521, the protrusion on the static contact can be inserted into the groove, thereby pre-fixing the static contact and the movable spring piece 521.

[0050] In some embodiments, the contact assembly 510 includes a first main contact 511 and a second main contact 512. The first main contact 511 and the second main contact 512 are arranged opposite each other along the length of the movable spring 521 and contact the two ends of the movable spring 521. The first main contact 511 includes two static contacts, which are respectively located at the two ends of the first main contact 511. By utilizing the static contacts, current enters the main contact from one end of the movable spring 521. The structure of the second main contact 512 is the same as that of the first main contact 511, and also includes two static contacts, which are respectively located at its two ends. When the push rod assembly 530 pushes the movable spring 521, the other end of the movable spring 521 contacts the static contact of the second main contact 512, thereby realizing the on-off of the current.

[0051] Through the symmetrical arrangement of the first main contact 511 and the second main contact 512, the current flows from the two static contact points of the first main contact 511 into the movable spring 521, and then flows through the movable spring 521 to the two static contact points of the second main contact 512, thereby ensuring the integrity and symmetry of the current path and reducing the problem of unbalanced electromotive repulsion caused by uneven current distribution.

[0052] In another embodiment, see Figure 8 and Figure 9 A spacing groove 5111 is provided between the two stationary contacts of the first main contact 511. This spacing groove 5111 significantly reduces current interference between the two stationary contacts, while preventing excessive arcing and enhancing the stability of current switching. The stationary contact structure of the second main contact 512 is identical to that of the first main contact 511. The spacing groove 5111 is also provided to ensure stable contact between the stationary contact and the movable spring 521 when short-circuit current passes through. The provision of the spacing groove 5111 optimizes current distribution between the contacts, preventing arc splashing and poor contact caused by the close distance between the stationary contacts.

[0053] The magnetic circuits formed by the first magnetic conductor 522 and the second magnetic conductor 523 are in the same direction. When current flows through, the attraction generated by the magnetic circuit can effectively offset the electromotive repulsion, thereby enhancing the contact stability between the contact and the movable spring 521.

[0054] In some embodiments, the moving contact bridge assembly 520 includes multiple magnetic conductive groups. Each magnetic conductive group includes two moving reeds 521, two first magnetic conductive bodies 522, and a second magnetic conductive body 523. One magnetic conductive group forms two magnetic conductive circuits, that is, each moving reed 521 and its corresponding first magnetic conductive body 522 and second magnetic conductive body 523 each form a magnetic conductive circuit. When a short-circuit current occurs, the current is diverted to different magnetic conductive circuits, and each circuit only needs to bear a portion of the current, reducing the current pressure and electromotive force on each circuit. Through this design, the contactor can better cope with loads in high-current environments and improve overall stability.

[0055] Multiple magnetic conductive groups are spaced apart along the width of the movable spring 521 to increase the conductive area, thereby improving the ability to resist electrodynamic repulsion. The independent magnetic conductive loop formed by each magnetic conductive group can effectively shunt short-circuit current, preventing a single magnetic conductive loop from bearing excessive current pressure.

[0056] Based on the structure of the above embodiment, when only one magnetic conductive group is provided, the short-circuit current of the DC contactor can be increased to a range of 14KA to 15KA.

[0057] In some embodiments, see Figure 12 and Figure 13The push rod assembly 530 includes a push rod 531, a spring seat 532, and a pressure spring 533. The push end of the push rod 531 is connected to the spring seat 532. The pressure spring 533 is mounted on the spring seat 532, and one end of the pressure spring 533 facing away from the spring seat 532 contacts the two first magnetic conductors 522. The push end of the push rod 531 is connected to the movable spring 521 via the spring seat 532. The push rod 531 applies a linear force, pushing the movable spring 521 into and out of contact with the stationary contact in the contact assembly 510 during the opening and closing process, thereby achieving on-off control of the circuit.

[0058] A spring seat 532 is disposed on top of the push rod 531, providing support for the pressure spring 533. This ensures that the push rod 531 can transmit force in a predetermined direction, thereby ensuring the stability of the movement of the movable spring 521. The pressure spring 533 is located on the spring seat 532, and the end of the pressure spring 533 facing away from the spring seat 532 contacts the first magnetic conductor 522. The pressure spring 533 exerts a constant pressure through its elastic force, ensuring stable contact between the movable spring 521 and the magnetic conductor, thus forming a complete magnetic circuit.

[0059] Furthermore, a limiting protrusion 5321 is provided on the side of the spring seat 532 away from the push rod 531, and the pressure spring 533 is sleeved on the limiting protrusion 5321 to limit the plane displacement of the pressure spring 533 in the length direction and the width direction, thereby improving the stability of the pressure spring 533.

[0060] When the push rod assembly 530 applies a force through the push rod 531, the pressure spring 533 ensures close contact between the movable spring 521 and the magnetic conductor through elastic force. Especially when a short-circuit current occurs, the pressure spring 533 can provide sufficient reverse force to offset the influence of the electric repulsive force on the contact between the movable spring 521 and the static contact.

[0061] Further, see Figure 10 and Figure 11There are two pressure springs 533, each of which contacts a first magnet 522. Of course, in other embodiments, there can be more than two pressure springs 533, and each first magnet 522 contacts the same number of pressure springs 533. Each pressure spring 533 is independently connected to a first magnet 522, and the end of the pressure spring 533 facing away from the spring seat 532 directly contacts the magnet. This allows the movable reed 521 to dynamically adjust according to the magnitude of the current when the push rod assembly 530 applies a force, thereby ensuring a balance between the attractive force formed by the magnetic circuit and the electromotive repulsive force. Specifically, when current flows through, the two pressure springs 533 provide a constant reverse elastic force based on the pressure applied by the push rod assembly 530, ensuring that the first magnets 522 on both sides of the movable reed 521 always maintain stable magnetic flux contact. In the event of a short-circuit current, the two pressure springs 533 can effectively buffer the impact of the electromotive repulsive force on the movable reed 521, preventing the contacts from disengaging due to insufficient pressure.

[0062] Furthermore, the two pressure springs 533 act independently on the two first magnetic conductors 522 , which can evenly distribute the pressure of the movable spring 521 , thereby avoiding the problem of tilting or poor contact caused by uneven force on one side.

[0063] In some embodiments, see Figures 5 to 7The contact module 500 further includes a bracket 540, an auxiliary contact box 550, an auxiliary contact 560, a magnetic conductive plate 570, a fixing pin 580, a return spring 590, a movable iron core 591, and a sleeve 592. The movable iron core 591 is disposed within the sleeve 592. The return spring 590 is disposed within the movable iron core 591 and extends to the top of the movable iron core 591. The magnetic conductive plate 570 is disposed at the end of the return spring 590 facing away from the movable iron core 591. A through hole is defined in the center of the magnetic conductive plate 570. A push rod 531 passes through the through hole and is inserted into the movable iron core 591. The return spring 590 is sleeved on the push rod 531, and the end of the push rod 531 facing away from the return spring 590 is embedded in the spring seat 532. Two fixing pins 580 are inserted into the spring seat 532 and arranged longitudinally opposite each other. The end of the push rod 531 located within the spring seat 532 is positioned between the two fixing pins 580, so that the end of the push rod 531 facing away from the return spring 590 is restrained by the two fixing pins 580. The bracket 540 is U-shaped, with two sides of the bracket 540 located on either side of the spring seat 532. The fixing pins 580 pass through both sides of the bracket 540 and the spring seat 532 to secure the bracket 540 to the spring seat 532. The U-shaped groove of the bracket 540 houses the pressure spring 533, the first magnetic conductor 522, the second magnetic conductor 523, and the movable spring 521. The auxiliary contact box 550 is located on the side of the bracket 540 facing away from the second magnetic conductor 523 and is removably secured to the side of the bracket 540. The auxiliary contact 560 is inserted through the auxiliary copper busbar 300 and contacts the auxiliary contact box 550.

[0064] Furthermore, a plurality of positioning protrusions 5231 are provided on the side of the second magnetic conductor 523 facing away from the first magnetic conductor 522, and a plurality of positioning holes 541 are provided on the top of the bracket 540, and each positioning protrusion 5231 is aligned with a positioning hole 541, so that the positioning protrusion 5231 is inserted into the positioning hole 541 to enable the auxiliary bracket 540 to be installed and realize the pre-positioning of the bracket 540.

[0065] It should be noted that in order to simplify the description of the embodiments of this application and thus facilitate understanding of one or more of the embodiments, the foregoing description of the embodiments of this application sometimes combines multiple features into a single embodiment, figure, or description thereof. However, this presentation does not mean that the subject matter of this application requires more features than those recited in the claims. In fact, the features of an embodiment may be fewer than all the features of the individual embodiments disclosed above.

Claims

1. A DC contactor, characterized in that: The contact module comprises a contact assembly, a movable contact bridge assembly and a push rod assembly, wherein the movable contact bridge assembly is connected to the push rod assembly, and the push rod assembly is used to push the movable contact bridge assembly into contact with the contact assembly; In which, the dynamic contact bridge assembly includes at least two dynamic springs, at least two first magnetic conductors and one second magnetic conductor. The first magnetic conductor and the second magnetic conductor are respectively arranged on the upper and lower sides of the dynamic spring, and the two first magnetic conductors are in contact with the second magnetic conductor, and one first magnetic conductor is in contact with one dynamic spring. Both ends of the dynamic spring in the length direction are in contact with the contact assembly, each first magnetic conductor and the second magnetic conductor form an independent magnetic circuit, and the two first magnetic conductors are in contact with the push rod assembly on the side facing away from the second magnetic conductor.

2. The DC contactor according to claim 1, characterized in that: The movable spring piece includes a middle portion and two side portions. Along the length direction of the movable spring piece, the two side portions are respectively connected to both sides of the middle portion. Along the width direction of the movable spring piece, the side portions and the middle portion are staggered. The two side portions and the middle portion jointly define an avoidance gap. The first magnetic conductor surrounds both sides of the middle portion in the width direction and one side of the first magnetic conductor is located in the avoidance gap. The second magnetic conductor is arranged on the middle portion and contacts with the first magnetic conductor to form a magnetic circuit.

3. The DC contactor according to claim 2, characterized in that: The cross-section of the first magnetic conductor in the longitudinal direction is U-shaped, the middle portion is located in the groove of the first magnetic conductor, and the second magnetic conductor contacts both ends of the first magnetic conductor.

4. The DC contactor according to claim 3, characterized in that: The two movable spring pieces are spaced apart along the width direction, and the limiting notches of the two movable spring pieces are arranged opposite to each other.

5. The DC contactor according to any one of claims 1 to 4, characterized in that: The contact assembly includes a first main contact and a second main contact, the first main contact and the second main contact are arranged opposite to each other along the length direction of the movable spring piece, and the first main contact and the second main contact each have two static contacts, the two static contacts of the first main contact respectively contact with one end of the two movable spring pieces, and the two static contacts of the second main contact respectively contact with the other end of the two movable spring pieces.

6. The DC contactor according to claim 5, characterized in that: The two static contacts of the first main contact are spaced apart, and a spacing groove is formed between the two static contacts of the first main contact.

7. The DC contactor according to claim 5, characterized in that: The first main contact and the second main contact have opposite electrical properties, and the two magnetic conductive loops formed by the two first magnetic conductive bodies and the second magnetic conductive bodies have the same direction.

8. The DC contactor according to any one of claims 1 to 4, characterized in that: The moving contact bridge assembly includes multiple magnetic conductive groups, each of which includes two moving springs, two first magnetic conductors and one second magnetic conductor. The two moving springs, two first magnetic conductors and one second magnetic conductor together form two magnetic conductive circuits, and the multiple magnetic conductive groups are arranged at intervals along the width direction of the moving spring.

9. The DC contactor according to any one of claims 1 to 4, characterized in that: The push rod assembly includes a push rod, a spring seat and a pressure spring. The push end of the push rod is connected to the spring seat. The pressure spring is arranged on the spring seat, and one end of the pressure spring facing away from the spring seat contacts the two first magnetic conductors.

10. The DC contactor according to claim 9, characterized in that: The number of the pressure springs is at least two, the number of the pressure springs contacted by each first magnetic conductor is the same, and the plurality of pressure springs are independently arranged.

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