DC contactor

Abstract

The invention 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 contact between the moving and static contacts is achieved, thereby connecting the load. When a short-circuit current flows through the DC contactor, an electric repulsion force will be generated between the moving and static contacts, thereby affecting the stability of the contact between the moving and static contacts. Although the method of increasing the magnetic conductive area is adopted in the related art to balance the electric repulsion force, 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 electric repulsion force between the moving and static contacts cannot be balanced, and there is still a risk of unstable contact between the moving and static contacts. Summary of the invention

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

[0004] The technical solution adopted by this application to solve the above technical problems is:

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

[0006] In which, the moving contact bridge assembly includes at least two moving 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 moving spring, the two first magnetic conductors are in contact with the second magnetic conductor, and one of the first magnetic conductors is in contact with one moving spring, both ends of the moving spring in the length direction are in contact with the contact assembly, each of the first magnetic conductor and the second magnetic conductor forms an independent magnetic conductive circuit, and the two first magnetic conductors are in contact with the push rod assembly on one 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 two 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.

[0008] In some embodiments of the present application, the cross-sectional shape of the first magnetic conductor in the length 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 are respectively in contact with one end of the two movable spring pieces, and the two static contacts of the second main contact are respectively in contact with the other end of the two movable spring pieces.

[0011] In some embodiments of the present application, the two stationary contacts of the first main contact are spaced apart from each other, and a spacing groove is formed between the two stationary 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 directions of the two magnetic conductive loops formed by the two first magnetic conductive bodies and the second magnetic conductive bodies are the same.

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

[0016] In summary, the DC contactor provided by the embodiment of the present application realizes the contact and cooperation between the moving contact bridge assembly and the contact assembly by using the push rod assembly to push the moving contact bridge assembly, and uses at least two first magnetic conductors, at least two moving springs and the second magnetic conductor in the moving contact bridge assembly to form at least two independent magnetic circuits, so as to achieve the purpose of increasing the magnetic conductive area, and the two magnetic circuits formed by the two first magnetic conductors and the two moving springs are independent of each other, so as to effectively avoid the large difference in the compensation electromagnetic force of the two magnetic circuits due to the shared moving spring or the shared first magnetic conductor, and further aggravate 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, firstly, by using the cooperation of the contact assembly, the moving contact bridge assembly and the push rod assembly, the DC contactor is powered on, which plays the role of conducting the load; then, by improving the structure of the moving contact bridge assembly, specifically, the moving contact bridge assembly includes at least two moving springs, at least two first magnetic conductors and the second magnetic conductor. By setting a first magnetizer to a corresponding moving spring piece, and the first magnetizer is in contact with the second magnetizer, so that the first magnetizer and the second magnetizer can form a loop, and by making the moving spring piece contact with the contact assembly, so that current can flow through the moving spring piece, and then an electromagnetic loop can be formed between the first magnetizer and the second magnetizer, generating an electromagnetic force, which can effectively resist the electromotive repulsion generated by the short-circuit current, and prevent the moving spring piece and the contact assembly from being repelled and separated due to the electromotive repulsion. In addition, the electromagnetic loops formed by the moving contact bridge assembly are at least two, which effectively increases the magnetic conductive area, thereby increasing the electromagnetic force, and can effectively adapt to the electromotive repulsion caused by a large short-circuit current. In addition, the two electromagnetic loops formed are formed by two independent moving spring pieces and two first magnetizers, so that the electromagnetic loop is an independent electromagnetic loop. Compared with a shared moving spring piece or a first magnetizer, it can effectively eliminate the risk of the magnetic conductive areas of the two electromagnetic loops being too different due to the inclination of one of the moving spring pieces or the first magnetizer, which then leads to the degradation of the performance of resisting short-circuit current, or even complete failure. Furthermore, when the same short-circuit current passes through a moving contact bridge assembly containing two or more independently arranged moving 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 increase in electromagnetic force brought about by two or more electromagnetic circuits formed by the contact bridge assembly, the short-circuit resistance of the product is jointly improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[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 viewing angle);

[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 viewing angle);

[0025] Fig. 9 for Figure 8 Explosion diagram of

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

[0027] Fig.11 for Fig.10 Explosion diagram of

[0028] Fig.12 for Fig.10 A schematic diagram of the structure of the cooperation between the moving contact bridge assembly and the push rod assembly of the contact module provided in;

[0029] Fig.13 for Fig.12 Explosion diagram of

[0030] Fig.14 A schematic diagram of the structure of the cooperation between a moving spring and a first magnetic conductor in a DC contactor provided in an embodiment of the present application;

[0031] Fig.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 bar; 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 words "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

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

[0037] See also Figures 1 to 4, an embodiment of the present application provides a DC contactor, including 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. Among them, a part of the contact module is connected to the coil 600, and the coil 600 is fixed in the yoke kit 700 together with a part of the contact module connected thereto. 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 on the bottom cover 800. The contact module has a contact assembly 510 on one side away from the yoke kit 700, and the contact assembly 510 is used to receive current. The contact assembly 510 is sleeved in the preset hole of the auxiliary copper busbar 300 and fixed by welding to conduct the current to the contact assembly 510. The magnet set 400 is arranged around the side of the contact module 500, and the circuit module 200, the auxiliary copper busbar 300 and the coil 600 are all welded and fixed. The housing 100 and the bottom cover 800 are combined and fixed, so that the circuit module 200, the auxiliary copper busbar 300, the magnet set 400, the contact module 500, the coil 600 and the yoke set 700 are all arranged in the installation space defined by the combination of the housing 100 and the bottom cover 800. As for the connector 900, it is fixed on the housing 100 and is mainly used for plugging in a power supply or other loads.

[0038] The magnet set 400 includes two fixing frames and two magnetic steels. The two fixing frames are arranged opposite to each other and are respectively clamped on the side of the contact module 500. The magnetic steels are fixed on the inner side of the fixing frames. One magnetic steel is fixed on the inner side of one fixing frame. The two magnetic steels are arranged opposite to each other and have opposite magnetic properties. When the fixing frames are clamped on the side of the contact module 500, the magnetic steels are attached to the side of the contact module 500.

[0039] See also 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 moving contact bridge assembly 520 includes at least two moving 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 moving spring 521. The two first magnets 522 are both in contact with the second magnet 523, and one first magnet 522 is corresponding to one moving spring 521. The two ends of the moving 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 conductive circuit, and the two first magnets 522 are both in contact with the push rod assembly 530 on one side away from the second magnet 523.

[0041] The moving contact bridge assembly 520 includes at least two moving springs 521, and the two ends of the moving springs 521 are respectively connected to the contact assembly 510. The push rod assembly 530 is connected to the moving contact bridge assembly 520, and applies a force to make the moving springs 521 contact or disconnect with the contact assembly 510 to realize the switching of current. The moving springs 521 in the moving contact bridge assembly 520 have the ability to resist short-circuit current. The design of the moving springs 521 forms at least two magnetic conductive circuits by setting a first magnetic conductive body 522 and a second magnetic conductive body 523. The first magnetic conductive body 522 and the second magnetic conductive body 523 are respectively arranged on both sides of each moving spring 521, and the two ends of the moving spring 521 are in contact with the contact assembly 510. When the push rod assembly 530 pushes the moving spring 521, the short-circuit current is conducted through the moving spring 521, and the magnetic conductive bodies on both sides of the moving spring 521 shunt the short-circuit current into multiple magnetic conductive circuits, thereby reducing the electric repulsion of a single magnetic conductive 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 on a single magnetic conductive loop when passing through the contactor.

[0042] The moving reed 521 in the moving contact bridge assembly 520 is designed to have a first magnet 522 and a second magnet 523 on both sides, and the first magnet 522 is in contact with 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 moving reed 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 force. The suction force 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 passes through the contactor, the push rod assembly 530 pushes the movable spring 521, so that the two ends of the movable spring 521 contact the static contacts of the contact assembly 510. The current enters the movable spring 521 from the two static contacts of the first main contact 511, passes through the movable spring 521, and 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 conductor of the movable spring 521 shunts the short-circuit current into multiple magnetic conductive circuits, thereby reducing the current pressure on a single circuit and enhancing the ability to resist short-circuit current.

[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 conductive 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 degradation 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 spring leaves 521, at least two first magnetic conductors 522 and a second magnetic conductor 523. By arranging a first magnetizer 522 corresponding to a movable spring piece 521, and the first magnetizer 522 is in contact with the second magnetizer 523, so that the first magnetizer 522 and the second magnetizer 523 can form a loop, and by making the movable spring piece 521 contact with the contact assembly 510, so that current can flow through the movable spring piece 521, and then an electromagnetic loop can be formed between the first magnetizer 522 and the second magnetizer 523, generating electromagnetic force, which can effectively resist the electromotive force generated by the short-circuit current, and prevent the movable spring piece 521 and the contact assembly 510 from being repelled and separated due to the electromotive force. In addition, the movable contact bridge assembly 520 forms at least two electromagnetic loops, which effectively increases the magnetic conductive area, thereby increasing the electromagnetic force, and can effectively adapt to the electromotive force caused by a large short-circuit current. Furthermore, the two electromagnetic circuits are formed by two independent movable spring pieces 521 and two first magnets 522, so that the electromagnetic circuit is an independent electromagnetic circuit. Compared with the shared movable spring piece 521 or the first magnet 522, the electromagnetic circuit can effectively eliminate the risk of excessive difference in magnetic conductive areas of the two electromagnetic circuits due to the inclination of one of the movable spring pieces 521 or the first magnet 522, which leads to degradation of the performance of resisting short-circuit current, or even complete failure.

[0045] In some embodiments, see Figure 7 , Fig.12 as well as Fig.13The moving spring piece 521 in the moving contact bridge assembly 520 includes a middle portion 5211 and two side portions 5212 along its length direction. The middle portion 5211 is the main body of the moving spring piece 521, and the two side portions 5212 are respectively connected to the two sides of the middle portion 5211 to form a supporting structure. The middle portion 5211 and the side portions 5212 are staggered up and down along the width direction, and an avoidance gap 5213 is formed between the two side portions 5212 and the middle portion 5211 of the moving spring piece 521. The avoidance gap 5213 provides space for the arrangement of the first magnetizer 522, so that the first magnetizer 522 can surround the middle portion 5211, and at the same time, in the width direction, the first magnetizer 522 is in contact with the second magnetizer 523 to form a complete magnetic conductive circuit. The existence of this avoidance gap 5213 enables the magnetizer to be arranged more closely and reasonably around the moving spring piece 521, thereby improving the magnetic conductive effect.

[0046] The first magnet 522 is a U-shaped structure, and its groove part covers both sides of the middle part 5211 of the moving spring 521, and the two ends of the U-shape are respectively in contact with the second magnet 523 to form an independent magnetic conductive circuit. The first magnet 522 forms a symmetrical magnetic conductive circuit on both sides of the moving spring 521 through its U-shaped structure. One side of the first magnet 522 is located in the avoidance gap 5213 of the moving spring 521, so that the magnet can achieve a stable magnetic field distribution without increasing the thickness and width of the moving spring 521. The second magnet 523 is arranged above the middle part 5211 of the moving spring 521, and contacts with the U-shaped first magnet 522 to form 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 electric repulsion.

[0047] In some embodiments, the two movable spring pieces 521 are arranged at intervals along the width direction thereof, and the limiting notches of the two movable spring pieces 521 are arranged toward each other. By arranging the two movable spring pieces 521 at intervals, current interference caused by contact between the two movable spring pieces 521 is avoided. Also, by arranging the limiting notches of the two movable spring pieces 521 toward each other, so that a part of the first magnetic conductor 522 can be located in the limiting notch, a part of the second magnetic conductor 523 can be located in the limiting notch of the other movable spring piece 521, and the parts of the two magnetic conductors located in the limiting notch are arranged close to each other, it is beneficial to save the width of the movable spring piece 521 in the width direction, thereby reducing the volume of the contact module 500 and improving the compactness of the structure. For ease of understanding, as shown in the comparative example: the limiting notches of the two movable spring pieces 521 are arranged back to back, one end of the first magnet 522 is arranged 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 magnets between the two movable spring pieces 521, which will lead to an increase in the width and width of the two magnets 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 with 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 with 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 piece 521 can contact the contact assembly 510, so that the current derived from the contact assembly 510 can flow through the movable spring piece 521, so that the two side portions 5212 of the movable spring piece 521 carry 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 electric repulsive force, thereby balancing or even exceeding the electric repulsive force, ensuring that the movable spring piece 521 is always in contact with the contact assembly 510.

[0049] In some embodiments, see Fig.14 and Fig.15 The movable spring piece 521 has grooves on both the front and back surfaces thereof, which are helpful in reducing the weight of the movable spring piece 521. The groove is 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 to each other along the length direction 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 using the static contacts, the 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 to realize 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 contacts of the first main contact 511 into the moving spring piece 521, and then flows to the two static contacts of the second main contact 512 through the moving spring piece 521, thereby ensuring the integrity and symmetry of the current path and reducing the problem of unbalanced electric repulsion force that may be caused by uneven current distribution.

[0052] In another embodiment, see Figure 8 and Fig. 9 , a spacing groove 5111 is provided between the two static contacts of the first main contact 511. The spacing groove 5111 greatly reduces the current interference between the two static contacts, while avoiding excessive arc generation and enhancing the stability of current switching. The static contact structure of the second main contact 512 is the same as that of the first main contact 511, and the spacing groove 5111 is also provided to ensure stable contact between the static contact and the moving spring 521 when the short-circuit current passes. The provision of the spacing groove 5111 optimizes the current distribution between the contacts and avoids arc splashing and poor contact problems caused by the close distance between the static 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 moving reed 521 .

[0054] In some embodiments, the moving contact bridge assembly 520 includes a plurality of 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 form a magnetic conductive circuit respectively. When a short circuit current occurs, the current is diverted to different magnetic conductive circuits, and each circuit only needs to bear a part of the current, reducing the current pressure and electric repulsion on each circuit. Through this design, the contactor can better cope with the load in a high current environment and improve the overall stability.

[0055] Multiple magnetic conductive groups are arranged at intervals along the width direction of the movable spring piece 521 to increase more magnetic conductive area, thereby improving the ability to resist electromotive repulsion. The independent magnetic conductive loop formed by each magnetic conductive group can effectively shunt short-circuit current and avoid a single magnetic conductive loop from bearing too much current pressure.

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

[0057] In some embodiments, see Fig.12 and Fig.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 arranged on the spring seat 532, and one end of the pressure spring 533 away from the spring seat 532 is in contact with the two first magnetic conductors 522. The push end of the push rod 531 is connected to the moving spring 521 through the spring seat 532. The push rod 531 applies a force in a straight line direction, pushing the moving spring 521 to contact and separate with the static contact in the contact assembly 510 during the opening and closing process, thereby realizing the on-off control of the circuit.

[0058] The spring seat 532 is disposed at the top of the push rod 531 to provide support for the pressure spring 533, ensuring that the push rod 531 can transmit the force in a predetermined direction, and ensuring the movement stability of the movable spring 521. The pressure spring 533 is located on the spring seat 532, and one end of the pressure spring 533 away from the spring seat 532 is in contact with the first magnet 522. The pressure spring 533 applies a constant pressure through elastic force, ensuring that the movable spring 521 and the magnet maintain stable contact, forming a complete magnetic conductive 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 for limiting 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 the 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 repulsion force on the contact between the movable spring 521 and the static contact.

[0061] For further information, see Fig.10 and Fig.11, the number of pressure springs 533 is two, and each pressure spring 533 contacts a first magnet 522. Of course, in other embodiments, the number of pressure springs 533 can also be more than two, and the number of pressure springs 533 contacted by each first magnet 522 is the same. Each pressure spring 533 is independently connected to a first magnet 522, and one end of the pressure spring 533 away from the spring seat 532 directly contacts the magnet, so that when the push rod assembly 530 applies a force, the movable spring 521 can be dynamically adjusted according to the magnitude of the current to ensure the balance between the suction force and the electric repulsion formed by the magnetic circuit. Specifically, when the current passes through, the two pressure springs 533 provide a constant reverse elastic force according to the pressure applied by the push rod assembly 530, ensuring that the first magnets 522 on both sides of the movable spring 521 always maintain stable magnetic flux contact. In the case of short-circuit current, the two pressure springs 533 can effectively buffer the impact of the electric repulsion on the movable spring 521, and prevent the contact from being separated 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 piece 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 plate 570, a fixing pin 580, a reset spring 590, a moving iron core 591 and a sleeve 592. The moving iron core 591 is disposed in the sleeve 592, the reset spring 590 is disposed in the moving iron core 591 and extends to the top of the moving iron core 591, and the magnetic plate 570 is disposed at one end of the reset spring 590 away from the moving iron core 591. A through hole is provided in the center of the magnetic plate 570, and the push rod 531 passes through the through hole and is inserted into the moving iron core 591. The reset spring 590 is sleeved on the push rod 531, and one end of the push rod 531 away from the reset spring 590 is embedded in the spring seat 532. Two fixing pins 580 are inserted into the spring seat 532, and the two fixing pins 580 are arranged opposite to each other along the length direction. One end of the push rod 531 located in the spring seat 532 is located between the two fixing pins 580, so that the end of the push rod 531 away from the reset spring 590 is limited by the two fixing pins 580. The bracket 540 is U-shaped, and the two sides of the bracket 540 are respectively located on the two sides of the spring seat 532, and the fixing pins 580 pass through the two sides of the bracket 540 and the spring seat 532 at the same time, so that the bracket 540 is fixed to the spring seat 532. In the U-shaped groove of the bracket 540, a pressure spring 533, a first magnetic conductor 522, a second magnetic conductor 523 and a moving spring 521 are arranged. The auxiliary contact box 550 is arranged on the side of the bracket 540 away from the second magnetic conductor 523 and is detachably fixed to the side of the bracket 540. The auxiliary contact 560 is penetrated on the auxiliary copper bus 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 opened 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, so that the auxiliary bracket 540 can be installed and the bracket 540 can be pre-positioned.

[0065] It should be noted that in order to simplify the description of the embodiments of the present application and thus help understand one or more embodiments of the application, in the above description of the embodiments of the present application, multiple features are sometimes merged into one embodiment, drawing or description thereof. However, this method of expression does not mean that the features required by the object of the present application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment 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 to contact the contact assembly; In which, the moving contact bridge assembly includes at least two moving 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 moving spring, the two first magnetic conductors are in contact with the second magnetic conductor, and one of the first magnetic conductors is in contact with one moving spring, both ends of the moving spring in the length direction are in contact with the contact assembly, each of the first magnetic conductor and the second magnetic conductor forms an independent magnetic conductive circuit, and the two first magnetic conductors are in contact with the push rod assembly on one 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 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 two 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-sectional shape of the first magnetic conductor in the length 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 arranged at intervals 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 are respectively in contact with one end of the two movable spring pieces, and the two static contacts of the second main contact are respectively in contact with the other end of the two movable spring pieces.

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

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

8. The DC contactor according to any one of claims 1 to 4, characterized in that: The moving contact bridge assembly includes a plurality of magnetic conductive groups, each of which includes two moving springs, two first magnetic conductive bodies and one second magnetic conductive body. The two moving springs, two first magnetic conductive bodies and one second magnetic conductive body together form two magnetic conductive circuits, and the plurality of magnetic conductive groups are spaced apart 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.

Images