High-voltage DC contactors

Abstract

The present invention discloses a high-voltage DC contactor, comprising an arc extinguishing hood, a magnetic pole plate connected to the arc extinguishing hood and forming an arc extinguishing chamber, two static contacts partially inserted into the arc extinguishing chamber, a magnetic circuit mechanism disposed adjacent to one side of the magnetic pole plate, a push rod, an insulating support seat, and a movable contact structure. One end of the push rod is connected to the magnetic circuit mechanism, and the other end extends into the arc extinguishing chamber and is connected to the insulating support seat. The movable contact structure comprises a base embedded in the insulating support seat, two contact portions disposed on either side of the base, and two spring-loaded portions symmetrically connected between the two contact portions and the base. When the magnetic circuit mechanism drives the two contact portions to contact and engage with the two static contacts, the two spring-loaded portions are elastically deformed and provide the two contact portions with a uniform, nonlinear elastic pressure that matches the increasing electromagnetic driving force. This high-voltage DC contactor features a small size, low contact resistance, high short-circuit resistance, good heat dissipation, and high operational reliability, thus meeting market demand.

Description

Technical Field

[0001] The present invention relates to the technical field of contactors, and in particular to a high-voltage DC contactor with small size, low contact resistance and high short-circuit resistance. Background Art

[0002] As is well known, in traditional direct-acting contactor structures, the push rod in the electromagnetic drive device is generally connected to the moving contact piece through a combination of an insulating seat, a U-shaped basket, and a contact spring. However, in actual application, this connection method between the push rod and the moving contact piece is prone to the following shortcomings:

[0003] ① Because the moving contact piece provides contact pressure to the two static contacts by compressing the contact spring, and the arrangement of the contact spring and the elastic force characteristics generated by it are prone to the phenomenon of inconsistent contact pressure between the moving contact piece and the two static contacts, which leads to a large contact resistance of the contactor product and has a negative impact on the short-circuit resistance of the contactor product.

[0004] ② To ensure low contact resistance and high short-circuit resistance in contactor products, the contact pressure must be increased during contactor design, which requires increasing the elastic coefficient of the contact spring. To accommodate the adjustment of the contact spring, the volume of the coil winding must also be adjusted accordingly. This not only conflicts with the design requirements of miniaturized contactor products, but also increases costs.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] In order to overcome the above-mentioned defects, the present invention provides a high-voltage DC contactor, which has the advantages of simple and reasonable structure, small size, low contact resistance, high short-circuit resistance, good heat dissipation performance, high working stability and reliability, low processing cost, etc., which well meets market demand.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a high-voltage DC contactor, including an arc extinguishing cover, a magnetic pole plate, two static contacts and a magnetic circuit mechanism, the magnetic pole plate is sealed and fixedly connected to the opening side of the arc extinguishing cover, and together with the arc extinguishing cover, it forms an arc extinguishing cavity; the two static contacts are fixedly arranged on the arc extinguishing cover in a manner that one end is inserted into the arc extinguishing cavity and the other end extends out of the arc extinguishing cavity, and the magnetic circuit mechanism is arranged on the side of the magnetic pole plate facing away from the arc extinguishing cover to provide electromagnetic driving force when power is turned on; a moving contact piece push rod module is also provided, and the moving contact piece push rod module is provided with a push rod, an insulating support seat and a moving contact piece structure, and one end of the push rod is connected to the magnetic circuit mechanism The other end of the push rod is sealed and movably extends into the arc extinguishing chamber, and is fixedly connected to the insulating support seat at the same time. The moving contact piece structure is provided with a base partially buried in the insulating support seat, two contact parts respectively arranged on opposite sides of the base, and two spring-pressing parts that are curved and symmetrically connected between the two contact parts and the base. When the moving contact piece push rod module moves toward the static contact under the drive of the magnetic circuit mechanism and makes the two contact parts contact and attract with one end of the two static contacts respectively, the two spring-pressing parts can generate elastic deformation and provide nonlinear elastic pressure of the same size and adapted to the increasing manner of the electromagnetic driving force to the two contact parts.

[0008] As a further improvement of the present invention, the base and the contact portion are both made of a hard copper busbar, and the spring-pressing portion is a flexible copper busbar formed by stacking a number of thin copper sheets.

[0009] As a further improvement of the present invention, the cross-sectional shape of the elastic pressing portion is arc-shaped, V-shaped or wavy.

[0010] As a further improvement of the present invention, in the movable contact piece structure, the two springing portions are arranged side by side and symmetrically, and correspondingly, the two contact portions are also arranged side by side and symmetrically.

[0011] As a further improvement of the present invention, the contact portion, the spring portion and the base portion are fixedly connected into one body through a welding process.

[0012] As a further improvement of the present invention, in the movable contact piece structure, each of the contact parts is provided with a front side and a back side arranged back to back, the front side of the contact part is a plane for engaging with the static contact, and a plurality of heat dissipation blocks are integrally provided on the back side of the contact part.

[0013] As a further improvement of the present invention, the push rod is in the shape of a straight rod, and the other end of the push rod, the insulating support seat and the base of the moving contact piece structure are fixedly connected together through an injection molding process. In addition, the two spring-pressing parts are completely extended outside the insulating support seat.

[0014] As a further improvement of the present invention, the insulating support seat is divided into two sections along the axial direction of the push rod, namely a first section and a second section;

[0015] The base is embedded in the first section, the other end of the push rod is embedded in the second section, and the center line of the base coincides with the center axis of the push rod.

[0016] As a further improvement of the present invention, the magnetic circuit mechanism is provided with a coil winding, a moving iron core movably arranged in the space surrounded by the coil winding and fixedly connected to one end of the push rod, and a reset spring sleeved on the push rod. When the coil winding is energized, the moving iron core can drive the moving contact piece push rod module to move toward the static contact until the two contact parts are respectively attracted and connected with the two static contacts; and when the coil winding is de-energized, under the action of the elastic reset force of the reset spring and the gravity of the moving contact piece push rod module itself, the moving contact piece push rod module moves back to the static contact until the two contact parts are respectively disconnected and separated from the two static contacts.

[0017] As a further improvement of the present invention, the magnetic circuit mechanism is also provided with a static iron core, which is also arranged in the space surrounded by the coil winding and opposite to the moving iron core. At the same time, the static iron core is also fixedly connected to the magnetic pole plate, and the static iron core and the magnetic pole plate are respectively provided with through-holes for the push rod to move through; in addition, the two ends of the reset spring are elastically abutted against the static iron core and the moving iron core respectively.

[0018] The beneficial effects of the present invention are as follows: compared with the traditional direct-acting contactor structure, the high-voltage DC contactor provided by the present invention has the following advantages: ① The two spring-loaded portions in the movable contact structure can provide the two contact parts with elastic pressure of the same magnitude, that is, the contact pressure between the two contact parts and the two static contacts is consistent, thereby ensuring that the contact resistance of the contactor product is low and significantly improving the short-circuit resistance of the contactor product. ② Unlike the traditional contact spring that provides nearly linear elastic pressure to the movable contact, the two spring-loaded portions in the movable contact structure can provide the two contact parts with nonlinear elastic pressure that is more compatible with the increasing manner of the electromagnetic driving force, thereby providing the contact parts with a larger and more ideal elastic pressure without increasing the volume of the coil winding in the magnetic circuit mechanism or the current flowing into the coil winding, thereby promoting the miniaturization of the contactor product and reducing the processing cost of the contactor product. ③ The movable contact push rod module eliminates the traditional contact spring configuration, simplifying the contactor product structure and reducing the product size, further promoting the miniaturization of contactor products and facilitating their assembly and processing. ④ The high-voltage DC contactor has a simple and reasonable structure, a small size, is easy to process and manufacture, and has a low production cost, facilitating production implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the cross-sectional structure of the high-voltage DC contactor of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the assembly structure when the moving contact piece push rod module and two static contacts are assembled together;

[0021] Figure 3 for Figure 2 A schematic diagram of the three-dimensional structure of the moving contact piece push rod module shown in FIG;

[0022] Figure 4 for Figure 2 A side structural diagram of the moving contact piece push rod module shown in FIG;

[0023] Figure 5 for Figure 3 A schematic diagram of the three-dimensional structure of the moving contact piece structure shown in FIG;

[0024] Figure 6 for Figure 5 A schematic side view of the structure of the moving contact piece shown in FIG;

[0025] Figure 7 for Figure 5 A bottom-view structural diagram of the moving contact piece structure shown in FIG;

[0026] Figure 8 This is a curve diagram of the elastic pressure generated by the spring-pressing portion of the present invention, the electromagnetic driving force generated by the magnetic circuit mechanism, and the elastic pressure generated by the contact spring in a traditional direct-acting contactor.

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

[0028] 1. Arc extinguishing cover; 2. Magnetic pole plate; 3. Static contact; 4. Push rod; 5. Insulating support seat; 51. First section; 52. Second section; 6. Moving contact piece structure; 60. Base; 61. Contact part; 610. Front; 611. Back; 612. Heat sink; 62. Spring pressure part; 70. Coil winding; 71. Moving iron core; 72. Return spring; 73. Static iron core. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] Example

[0031] Please see the attached Figure 1 To the attached Figure 7 As shown, this embodiment provides a high-voltage DC contactor, including an arc extinguishing cover 1, a magnetic pole plate 2, two static contacts 3, a magnetic circuit mechanism and a moving contact piece push rod module, the magnetic pole plate 2 is sealed and fixedly connected to the opening side of the arc extinguishing cover 1, and together with the arc extinguishing cover 1, an arc extinguishing cavity AC is formed, and the two static contacts 3 are respectively fixed on the arc extinguishing cover 1 in a manner that one end is inserted into the arc extinguishing cavity and the other end extends out of the arc extinguishing cavity, the magnetic circuit mechanism is arranged on the side of the magnetic pole plate 2 facing away from the arc extinguishing cover 1, and is used to provide an electromagnetic driving force when power is turned on, the moving contact piece push rod module is provided with a push rod 4, an insulating support seat 5 and a moving contact piece structure 6, one end of the push rod 4 is connected to the magnetic circuit mechanism, and the other end of the push rod 4 is sealed and movably extends into the arc extinguishing cavity, and at the same time The insulating support seat 5 is fixedly connected, and the moving contact piece structure 6 is provided with a base 60 partially embedded in the insulating support seat 5, two contact parts 61 respectively arranged on opposite sides of the base 60 and two spring-pressing parts 62 that are curved and symmetrically connected between the two contact parts 61 and the base 60 (it can be understood that the insulating support seat 5 and the moving contact piece structure 6 are also built into the arc extinguishing chamber). When the moving contact piece push rod module moves toward the static contact 3 under the drive of the magnetic circuit mechanism and makes the two contact parts 61 contact and attract one end of the two static contacts 3 respectively, the two spring-pressing parts 62 can generate elastic deformation and provide nonlinear elastic pressure of the same size and adapted to the increasing manner of the electromagnetic driving force to the two contact parts 61 respectively.

[0032] From the above, it can be seen that compared with the traditional direct-acting contactor structure, the high-voltage DC contactor provided by this embodiment has the following advantages: ① The two spring-pressing parts 62 in the moving contact piece structure 6 can provide the two contact parts 61 with elastic pressure of the same size, that is: the contact pressure between the two contact parts 61 and the two static contacts 3 is consistent, thereby ensuring that the contact resistance of the contactor product is low and significantly improving the short-circuit resistance of the contactor product. Supplementary explanation: The elastic pressure provided by the spring-pressing part 62 to the contact part 61 is determined by the bending degree of the spring-pressing part 62. Therefore, the bending degree of the spring-pressing part 62 can be adjusted according to the design requirements of the contactor product to ensure that the elastic pressure provided by the two spring-pressing parts 62 is consistent. ② Unlike the traditional contact spring that provides nearly linear elastic pressure to the moving contact piece, the attached Figure 8 The “orange line” in the figure is a curve diagram of the elastic pressure generated by the contact spring; the two elastic pressing parts 62 in the movable contact piece structure 6 can provide the two contact parts 61 with a nonlinear elastic pressure that is more adapted to the increasing manner of the electromagnetic driving force. Figure 8 The "blue line" in the figure is a graph of the nonlinear elastic pressure generated by the spring portion 62 (i.e., the flexible copper busbar), and the "yellow line" is a graph of the electromagnetic driving force. This provides a greater, more ideal elastic pressure to the contact portion 61 without increasing the volume of the coil winding in the magnetic circuit mechanism or the current flowing in the coil winding, thereby promoting the miniaturization of contactor products and reducing their processing costs. The movable contact piece push rod module eliminates the traditional contact spring configuration, simplifying the contactor structure and reducing its size, further promoting the miniaturization of contactor products and facilitating their assembly and processing.

[0033] The specific structure of the high-voltage DC contactor provided in this embodiment is described in detail below.

[0034] Please continue to refer to the attached Figure 5 To the attached Figure 7 As shown, in the movable contact piece structure 6 provided in this embodiment, the base 60 and the contact part 61 are both made of hard copper bars to ensure the overall rigidity of the movable contact piece structure 6; the spring-pressing part 62 is a flexible copper bar formed by stacking a number of thin copper sheets, so as to ensure that the spring-pressing part 62 has excellent elasticity, is easy to produce elastic deformation, and generates nonlinear elastic pressure. At the same time, because the spring-pressing part 62 is composed of a number of thin copper sheets, the heat dissipation area of ​​the spring-pressing part 62 is greatly increased, thereby significantly improving the overall heat dissipation performance of the movable contact piece structure 6, thereby achieving low temperature rise of the contactor product and ensuring the stability and reliability of the contactor product during operation.

[0035] Furthermore, according to the design requirements of the contactor product, the thickness of the base 60, the two contact parts 61 and the two spring parts 62 are all designed to be at the millimeter level; the shapes of the base 60 and the two contact parts 61 are respectively designed to be block structures with regular shapes, as shown in the attached figure. Figure 5 The base 60 and the two contact parts 61 are shown as square block structures, but this application does not impose any restrictions on this; the two spring-pressing parts 62 have a cross-sectional shape (see the attached figure) according to the elastic pressure requirements preset for the contactor product. Figure 6 The cross section refers to the vertical cross section of the elastic portion 62) and can preferably be, but not limited to, an arc, a V or a wave shape. Figure 5 and 6 FIG. 5 shows a case where the cross-sectional shape of the pressing portion 62 is an arc.

[0036] For further information, please refer to the attached Figure 1 , Attachment Figure 5 and attached Figure 6 As shown, in the movable contact piece structure 6 of this embodiment, the two spring-pressing portions 62 are arranged side by side and symmetrically, the two contact portions 61 are also arranged side by side and symmetrically, and the two static contacts 3 are respectively matched with the two contact portions 61 in a one-to-one manner.

[0037] Furthermore, based on the above arrangement of the components in the movable contact piece structure 6 , in this embodiment, the contact portion 61 , the spring portion 62 and the base portion 60 are fixedly connected into one body through a resistance welding process.

[0038] For further information, please refer to the attached Figure 6 and 7 As shown, in the movable contact piece structure 6 of this embodiment, each of the contact parts 61 is provided with a front side 610 and a back side 611 which are arranged back to back, wherein the front side 610 of the contact part 61 is a plane for engaging with the static contact 3, and a plurality of heat dissipation blocks 612 are integrally provided on the back side 611 of the contact part 61 to increase the heat dissipation area of ​​the contact part 61, thereby further effectively improving the overall heat dissipation performance of the movable contact piece structure 6 and further ensuring the stability and reliability of the contactor product during operation.

[0039] Please continue to refer to the attached Figure 1 To the attached Figure 4As shown, in the movable contact piece push rod module structure provided in this embodiment, the push rod 4 is a straight rod. The other end of the push rod 4, the insulating support seat 5, and the base 60 of the movable contact piece structure 6 are fixedly connected together through an injection molding process. As can be understood, this molding process can achieve simple processing and easy production of the movable contact piece push rod module. In addition, relative to the insulating support seat 5, the two spring-pressing portions 62 are completely extended outside the insulating support seat 5.

[0040] For further information, please refer to the attached Figure 3 and 4 As shown, the insulating support seat 5 is divided into two sections along the axial direction of the push rod 4, namely the first section 51 and the second section 52; the base 60 is buried in the first section 51, and the other end of the push rod 4 is buried in the second section 52, and the center line of the base 60 coincides with the center axis of the push rod 4, so as to ensure that the force applied by the push rod 4 to the two spring-pressing parts 62 is consistent, and further ensure that the elastic pressure provided by the two spring-pressing parts 62 to the two contact parts 61 is consistent, thereby further reducing the contact resistance of the contactor product and improving the short-circuit resistance of the contactor product.

[0041] Furthermore, in order to adapt to the specific structure of the movable contact structure 6 and to improve the stability of the combination with the push rod 4, this embodiment also designs the cross-section of the insulating support seat 5 in the direction parallel to the axial direction of the push rod 4 to be a "convex" shape.

[0042] Please continue to refer to the attached Figure 1 As shown, the magnetic circuit mechanism described in this embodiment preferably adopts the following implementation structure: the magnetic circuit mechanism is provided with a coil winding 70, a moving iron core 71 movably arranged in the space surrounded by the coil winding 70 and fixedly connected to one end of the push rod 4, and a reset spring 72 sleeved on the push rod 4. When the coil winding 70 is energized, the moving iron core 71 can drive the moving contact piece push rod module to move toward the static contact 3 until the two contact parts 61 are respectively connected to the two static contacts 3; and when the coil winding 70 is de-energized, under the action of the elastic reset force of the reset spring 72 and the gravity of the moving contact piece push rod module itself, the moving contact piece push rod module moves back to the static contact 3 until the two contact parts 61 are respectively disconnected from the two static contacts 3.

[0043] Furthermore, the magnetic circuit mechanism is also provided with a static iron core 73, which is also arranged in the space surrounded by the coil winding 70 and is arranged opposite to the moving iron core 71. At the same time, the static iron core 73 is also fixedly connected to the magnetic pole plate 2, and the static iron core 73 and the magnetic pole plate 2 are respectively provided with through-holes for the push rod 4 to move through; in addition, the two ends of the reset spring 72 are elastically abutted against the static iron core 73 and the moving iron core 71 respectively.

[0044] Supplementary explanation: In the field of contactor technology, the magnetic circuit mechanism and the push rod 4 are generally collectively referred to as an electromagnetic drive device.

[0045] In summary, the high-voltage DC contactor provided in this application has the following advantages: simple and reasonable structure, small size; low contact resistance, high short-circuit resistance; good heat dissipation performance, high working stability and reliability; low processing cost, etc., which well meets market demand.

[0046] Final note: The prefixes "first", "second", etc. to the component names in this specification (such as the first paragraph, the second paragraph, etc.) are only for the convenience of description and are not used to limit the scope of implementation of the patent of this invention.

[0047] In the above description, many specific details are set forth in order to fully understand the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A high-voltage DC contactor, comprising an arc extinguishing cover (1), a magnetic pole plate (2), two static contacts (3) and a magnetic circuit mechanism, wherein the magnetic pole plate (2) is sealed and fixedly connected to the opening side of the arc extinguishing cover (1), and together with the arc extinguishing cover (1), forms an arc extinguishing cavity; the two static contacts (3) are fixedly arranged on the arc extinguishing cover (1) in a manner such that one end is inserted into the arc extinguishing cavity and the other end extends out of the arc extinguishing cavity; the magnetic circuit mechanism is arranged on the side of the magnetic pole plate (2) facing away from the arc extinguishing cover (1) to provide an electromagnetic driving force when power is applied; and is characterized in that: A movable contact piece push rod module is also provided, the movable contact piece push rod module is provided with a push rod (4), an insulating support seat (5) and a movable contact piece structure (6), one end of the push rod (4) is connected to the magnetic circuit mechanism, the other end of the push rod (4) is sealed and movably extends into the arc extinguishing cavity, and is fixedly connected to the insulating support seat (5), the movable contact piece structure (6) is provided with a base (60) partially embedded in the insulating support seat (5), two contact parts (61) respectively provided on opposite sides of the base (60) and two The spring-pressing portion (62) is curved and symmetrically connected between the two contact portions (61) and the base portion (60). When the movable contact piece push rod module moves toward the static contact (3) under the drive of the magnetic circuit mechanism and the two contact portions (61) are respectively brought into contact with one end of the two static contacts (3) for attraction, the two spring-pressing portions (62) can generate elastic deformation and respectively provide the two contact portions (61) with nonlinear elastic pressure of the same size and adapted to the increasing manner of the electromagnetic driving force.

2. The high-voltage DC contactor according to claim 1, characterized in that: The base (60) and the contact portion (61) are both made of a hard copper busbar, and the spring-pressing portion (62) is a flexible copper busbar formed by stacking a number of thin copper sheets.

3. The high-voltage DC contactor according to claim 2, characterized in that: The cross-sectional shape of the elastic pressing portion (62) is arc-shaped, V-shaped or wavy.

4. The high-voltage DC contactor according to claim 1, characterized in that: In the movable contact piece structure (6), the two spring-pressing portions (62) are arranged side by side and symmetrically, and correspondingly, the two contact portions (61) are also arranged side by side and symmetrically.

5. The high-voltage DC contactor according to claim 4, characterized in that: The contact portion (61), the spring-pressing portion (62), and the base portion (60) are fixedly connected into one body through a welding process.

6. The high-voltage DC contactor according to claim 1, characterized in that: In the movable contact piece structure (6), each contact part (61) is provided with a front side (610) and a back side (611) arranged back to back, the front side (610) of the contact part (61) is a plane for engaging with the static contact (3), and a plurality of heat dissipation blocks (612) are integrally provided on the back side (611) of the contact part (61).

7. The high-voltage DC contactor according to claim 1, characterized in that: The push rod (4) is in the shape of a straight rod. The other end of the push rod (4), the insulating support seat (5) and the base (60) of the movable contact structure (6) are fixedly connected together through an injection molding process. In addition, the two spring-pressing portions (62) are completely extended outside the insulating support seat (5).

8. The high-voltage DC contactor according to claim 7, characterized in that: The insulating support seat (5) is divided into two sections along the axial direction of the push rod (4), namely a first section (51) and a second section (52); The base (60) is embedded in the first section (51), the other end of the push rod (4) is embedded in the second section (52), and the center line of the base (60) coincides with the center axis of the push rod (4).

9. The high-voltage DC contactor according to claim 1, characterized in that: The magnetic circuit mechanism is provided with a coil winding (70), a moving iron core (71) movably arranged in a space surrounded by the coil winding (70) and fixedly connected to one end of the push rod (4), and a reset spring (72) sleeved on the push rod (4). When the coil winding (70) is energized, the moving iron core (71) can drive the moving contact piece push rod module to move toward the static contact (3) until the two contact parts (61) are respectively connected to the two static contacts (3); and when the coil winding (70) is de-energized, under the action of the elastic reset force of the reset spring (72) and the weight of the moving contact piece push rod module itself, the moving contact piece push rod module moves away from the static contact (3) until the two contact parts (61) are respectively disconnected from the two static contacts (3).

10. The high-voltage DC contactor according to claim 9, characterized in that: The magnetic circuit mechanism is further provided with a static iron core (73), which is also arranged in the space surrounded by the coil winding (70) and is arranged opposite to the moving iron core (71). The static iron core (73) is also fixedly connected to the magnetic pole plate (2), and the static iron core (73) and the magnetic pole plate (2) are respectively provided with through holes for the push rod (4) to movably penetrate. In addition, both ends of the return spring (72) elastically abut against the static iron core (73) and the movable iron core (71), respectively.

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