High voltage DC contactor

Abstract

The present application provides a high-voltage DC contactor, which relates to the technical field of contactors. The high-voltage DC contactor includes: a magnetic steel fixing frame, two auxiliary contact lead-out terminals, two main contacts, a ceramic cover, two magnetic steels, two magnetic steel frames, a push rod assembly, an auxiliary spring sheet, an armature assembly, a yoke iron plate and two auxiliary contact lead-out sheets; the two auxiliary contact lead-out sheets are integrally formed by injection molding with the magnetic steel fixing frame; the material of the magnetic steel fixing frame is plastic; each auxiliary contact lead-out sheet has a connecting portion, and each auxiliary contact lead-out sheet is electrically connected to an auxiliary contact lead-out terminal through the connecting portion. Compared with the method of welding the auxiliary contact lead-out terminal with a wire, this method eliminates the disadvantages of the original wire lead-out being easy to be crushed and difficult to install, and improves the reliability of the auxiliary contact function to the external electrical connection. Furthermore, the requirements of miniaturization, compactness and de-wiring of high-voltage DC contactors are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of contactors, and in particular to a high-voltage direct current contactor. Background Art

[0002] In the field of contactor technology, a high-voltage DC contactor is a contactor used to control a DC high-voltage circuit and is widely used in energy storage, automobiles, engineering vehicles and other fields.

[0003] In the related art, two auxiliary contact lead-out terminals of the high-voltage DC contactor are fixed on the top of the ceramic cover, and the auxiliary contact function is electrically connected to the outside by welding the wires to the auxiliary contact lead-out terminals.

[0004] However, the wire is difficult to fix in the housing of the DC high-voltage contactor and is easily crushed during assembly, which makes the reliability of the auxiliary contact function to the external electrical connection low.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] The present application provides a high-voltage DC contactor, which at least to a certain extent solves the problem of low reliability of auxiliary contact function to external electrical connection in the related art.

[0007] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0008] According to one aspect of the present application, a high-voltage DC contactor is provided, comprising: a magnetic steel fixing frame, two auxiliary contact lead-out terminals, two main contacts, a ceramic cover, two magnetic steels, two magnetic steel frames, a push rod assembly, an auxiliary spring, an armature assembly, a yoke iron plate and two auxiliary contact lead-out pieces; the two auxiliary contact lead-out pieces are integrally formed with the magnetic steel fixing frame by injection molding, and the material of the magnetic steel fixing frame is plastic; each auxiliary contact lead-out piece has a connecting portion, and each auxiliary contact lead-out piece is electrically connected to an auxiliary contact lead-out terminal through the connecting portion.

[0009] Compared with the method of welding the wire to the auxiliary contact lead-out terminal, the method of integrating the auxiliary contact lead-out piece with the magnetic steel fixing frame and connecting the auxiliary contact lead-out piece with the auxiliary contact lead-out terminal eliminates the disadvantages of the original wire lead-out being easy to be crushed and difficult to install, and improves the reliability of the auxiliary contact function to the external electrical connection.

[0010] Furthermore, the requirements of miniaturization, compactness and de-wiring of high-voltage DC contactors are achieved.

[0011] In one embodiment of the present application, the connection portion is electrically connected to the auxiliary contact lead-out terminal by welding.

[0012] The welding method can better ensure the reliability of the auxiliary contact function to the external electrical connection.

[0013] In one embodiment of the present application, the high-voltage DC contactor also includes: two transition rings; the magnetic steel fixing frame is configured on the ceramic cover; the top of the ceramic cover has four squarely symmetrical metal bosses, two metal bosses in the length direction of the four metal bosses are used to connect the two main contacts, and two metal bosses in the width direction are used to braze the two transition rings; the two auxiliary contact lead-out ends are respectively brazed on the two transition rings.

[0014] The two sides of the transition ring are brazed with the auxiliary contact lead-out terminal and the metal boss in the width direction of the top of the ceramic cover to ensure the airtight reliability of the brazing, making the high-voltage DC contactor more stable and reliable.

[0015] In one embodiment of the present application, both sides of the bottom width direction of the magnetic steel fixing frame have placement platforms; a magnetic steel and a magnetic steel frame are arranged on each placement platform.

[0016] By configuring the magnetic steel fixing frame with placement tables on both sides of the bottom width direction, and placing the magnetic steel frame and the magnet on the placement tables on both sides of the magnetic steel fixing frame, compared with directly configuring the magnetic steel frame and the magnet on the yoke plate, the magnetic circuit connection caused by the magnet being mounted on the yoke plate is avoided, thereby avoiding the loss of magnetic field strength to the yoke plate and improving the magnetic field strength at the contact center.

[0017] In addition, placing the magnets on the placement table can also ensure that the center lines of the two magnets correspond to the center positions of the contacts more reliably, further ensuring the magnetic field strength at the center of the contacts.

[0018] In one embodiment of the present application, a first air avoidance portion is provided around the area on the top of the magnetic steel fixing frame that cooperates with each main contact; the two first air avoidance portions are both located between the two areas on the top of the magnetic steel fixing frame that cooperate with the main contacts.

[0019] By setting two first air-avoiding parts between two areas cooperating with the main contacts in the top of the magnetic steel fixing frame, it is convenient to inject insulating adhesive (for example, epoxy adhesive) into the two first air-avoiding parts, thereby ensuring the voltage resistance performance between the two main contacts and between the main contact and the auxiliary contact lead-out terminal.

[0020] In one embodiment of the present application, both sides of the top width direction of the magnetic steel fixing frame have second air-avoiding portions.

[0021] By setting up a second avoidance portion on both sides in the width direction of the top of the magnetic steel fixing frame, the insulating adhesive can be injected from the top between the magnetic steel and the magnetic steel frame through the second avoidance portion, which is conducive to the insulating adhesive to better penetrate between the ceramic cover, the magnetic steel and the magnetic steel frame, and better fix the magnetic steel to prevent the magnetic steel from moving.

[0022] In one embodiment of the present application, the push rod assembly includes: a push rod, a spring seat and a plastic part; the push rod, the spring seat and the plastic part are injection molded as one piece; the spring seat includes a push rod through hole; the top of the push rod passes through the push rod through hole and is insulated and isolated from the spring seat by the plastic part; the plastic part has a receiving groove; the auxiliary spring is installed in the receiving groove.

[0023] The push rod, the spring seat and the plastic part are integrally formed by injection molding, a receiving groove is provided in the plastic part, and the auxiliary spring is installed in the receiving groove, so that the structure of the push rod assembly and the auxiliary spring is simpler and easier to manufacture, and the installation of the entire high-voltage DC contactor is simpler and easier to operate, thereby reducing the requirements of the high-voltage DC contactor for assembly workers.

[0024] In one embodiment of the present application, the armature assembly includes: a fixed plate, an upper armature plastic frame, two supports, an upper armature, a U-shaped bracket, a moving contact piece, a lower armature, and a contact spring; the two supports are both connected to the yoke plate; the fixed plate and the upper armature plastic frame are injection molded as one piece, and the fixed plate is fixedly connected to the upper armature; the upper armature plastic frame is respectively fixedly connected to the two supports; one end of the contact spring is fixedly connected to the lower armature, and the other end is arranged on the push rod assembly; the moving contact piece is located between the lower armature and the top of the U-shaped bracket; the bottom of both sides of the U-shaped bracket are connected to the push rod assembly.

[0025] When a short-circuit current passes through the moving contact piece, the magnetic field generated by the current will magnetize the upper and lower armatures, and the lower armature will be attracted by the upper armature. This attraction and the pressure brought by the contact spring will counteract the contact repulsion generated by the short-circuit current, thereby avoiding the risks of violent arcing, product failure, explosion, etc. caused by the contacts being bounced open. By configuring the armature assembly so that the upper and lower armatures are separated and the upper armature is fixed, the upper armature can be made independent of the push assembly. Therefore, although the upper armature is attracted downward by the lower armature, it will not affect the push assembly, thereby ensuring the reliability of the attraction between the moving iron core and the yoke iron plate.

[0026] In the traditional repulsive magnetic circuit structure, the upper armature and the lower armature are assembled in the moving contact piece assembly, and the gap between the upper and lower armatures is the breaking overtravel of the high-voltage DC contactor (also equal to the overtravel of the high-voltage DC contactor). With the development of high-voltage DC contactors, the overtravel value of the high-voltage DC contactor is required to be large (in order to increase the pressure between the contacts), while the breaking stroke of the high-voltage DC contactor is required to be smaller (in order to increase the suction force between the upper and lower armatures). The traditional anti-repulsive magnetic circuit structure cannot meet these contradictory requirements.

[0027] By configuring the armature assembly in such a way that the upper and lower armatures are separated and the upper armature is fixed, the upper armature can be made independent of the driving assembly. As a result, the armature assembly in this embodiment does not have the problem of insufficient suction force of the upper and lower armatures due to the large overtravel in the traditional repulsive magnetic circuit structure.

[0028] In one embodiment of the present application, the upper armature plastic frame is fixedly connected to the support by interference fit.

[0029] The fixing plate and the upper armature plastic frame are integrally formed by injection molding, and the support is installed in the upper armature plastic frame by interference fit, thereby ensuring insulation and isolation between the upper armature and the yoke iron plate.

[0030] In one embodiment of the present application, the push rod assembly includes a spring seat, and the spring seat has protrusions on both sides; the bottom of both sides of the U-shaped bracket respectively has a riveted through hole; the two riveted through holes are riveted to the two protrusions respectively.

[0031] By arranging protrusions on both sides of the spring seat and arranging riveting through holes on the bottoms of both sides of the U-shaped bracket, the assembly of the armature assembly is made more convenient and quick.

[0032] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 An exploded view of a high-voltage DC contactor in one embodiment of the present application is shown;

[0035] Figure 2 Show Figure 1 The schematic diagram of the enlarged area A in the middle;

[0036] Figure 3 A schematic diagram of the assembly of a high-voltage DC contactor in one embodiment of the present application is shown;

[0037] Figure 4 A schematic diagram showing a magnetic steel fixing frame in one embodiment of the present application is shown;

[0038] Figure 5 A schematic diagram showing an auxiliary contact lead-out sheet in one embodiment of the present application is shown;

[0039] Figure 6 A schematic diagram showing the top of a ceramic cover in a high voltage DC contactor in one embodiment of the present application is shown;

[0040] Figure 7 A schematic diagram showing the internal assembly of a high-voltage DC contactor in one embodiment of the present application;

[0041] Figure 8 A schematic diagram showing the assembly of a push rod assembly and an auxiliary spring in one embodiment of the present application;

[0042] Fig. 9 A schematic diagram showing the separation of the push rod assembly and the auxiliary reed in one embodiment of the present application;

[0043] Fig.10 A cross-sectional view of a high-voltage DC contactor in a closed contact state in one embodiment of the present application is shown. DETAILED DESCRIPTION

[0044] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0045] In addition, the accompanying drawings are only schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and thus their repeated description will be omitted.

[0046] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the high-voltage DC contactor in one embodiment of the present application may include: a magnetic steel fixing frame 1, two auxiliary contact lead-out terminals 2, two main contacts 3, a ceramic cover 4, two magnetic steels 5, two magnetic steel frames 6, a push rod assembly 7, an auxiliary spring 8, an armature assembly 9, a yoke iron plate 10 and two auxiliary contact lead-out plates 11.

[0047] Among them, Figure 4 As shown, the two auxiliary contact lead-out pieces 11 are integrally formed with the magnetic steel fixing frame 1 by injection molding, and the material of the magnetic steel fixing frame 1 is plastic.

[0048] Each auxiliary contact lead-out piece 11 has a connecting portion 1101 , and each auxiliary contact lead-out piece 11 is electrically connected to an auxiliary contact lead-out terminal 2 via the connecting portion 1101 .

[0049] In one embodiment, the two auxiliary contact lead-out pieces 11 and the magnetic steel fixing frame 1 are integrally formed by injection molding. The two auxiliary contact lead-out pieces 11 can be placed in a mold for casting the magnetic steel fixing frame 1, and then the plastic corresponding to the magnetic steel fixing frame 1 is injected, so that the two auxiliary contact lead-out pieces 11 are injection molded in the magnetic steel fixing frame 1, thereby achieving the integrally formed two auxiliary contact lead-out pieces 11 and the magnetic steel fixing frame 1 by injection molding.

[0050] It should be noted that the two auxiliary contact lead-out pieces 11 are insulated from each other.

[0051] The embodiments of the present application do not limit the specific plastic used in the magnetic steel fixing frame 1. For example, the plastic may be polycarbonate, polypropylene, nylon, etc.

[0052] Compared with the method of welding the wire to the auxiliary contact lead-out terminal, the method of integrating the auxiliary contact lead-out piece with the magnetic steel fixing frame and connecting the auxiliary contact lead-out piece with the auxiliary contact lead-out terminal eliminates the disadvantages of the original wire lead-out being easy to be crushed and difficult to install, and improves the reliability of the auxiliary contact function to the external electrical connection.

[0053] Furthermore, the requirements of miniaturization, compactness and de-wiring of high-voltage DC contactors are achieved.

[0054] The embodiments of the present application do not limit the specific structure of the connection portion 1101. For example, the connection portion 1101 is a through hole. For another example, the connection portion 1101 is a metal ring connector.

[0055] The embodiments of the present application do not limit how to achieve electrical connection between the connecting portion 1101 and the auxiliary contact lead-out terminal 2 .

[0056] In one embodiment, the connection portion 1101 is electrically connected to the auxiliary contact lead-out terminal 2 by welding or interference fit. The embodiment of the present application does not limit the specific welding method, for example, the welding method may be soldering.

[0057] In one embodiment, the connection portion 1101 of the auxiliary contact lead-out piece 11 is a through hole, and the through hole is clearance-matched with the auxiliary contact lead-out terminal 2 and fixed by soldering, thereby ensuring the reliability of the auxiliary contact function to the external electrical connection.

[0058] The welding method can better ensure the reliability of the auxiliary contact function to the external electrical connection.

[0059] It should be noted that Figure 1 , Figure 2 , Figure 4 and Figure 5 The shape and the lead-out position of the auxiliary contact lead-out piece 11 are merely exemplary, and the shape and the lead-out position of the auxiliary contact lead-out piece 11 can be adjusted according to the needs of actual applications.

[0060] In one embodiment, Figure 1 , Fig.10 As shown, the high-voltage DC contactor further includes: a coil assembly 13. The coil assembly 13 may include a return spring 1301, a moving iron core 1302, an iron core housing 1303 and a U-shaped yoke 1304.

[0061] The moving iron core 1302 has a through hole for the push rod 701 to penetrate, and an empty slot for placing the return spring 1301. The return spring 1301 is placed in the empty slot of the moving iron core 1302, and the end away from the moving iron core 1302 is connected to the yoke iron plate 10. The push rod penetrates the moving iron core 1302, and the penetration part is fixedly connected to the bottom of the moving iron core 1302 (for example, the connection method is welding).

[0062] The moving iron core 1302 is disposed in the iron core housing 1303 , and the iron core housing 1303 is fixedly connected to the yoke iron plate 10 so that the moving iron core 1302 can move in the sink groove of the iron core housing 1303 .

[0063] The bottom of the U-shaped bracket of the U-shaped yoke 1304 is fixedly connected to the yoke plate 10 .

[0064] In one embodiment, Figure 1 , Figure 6 and Figure 7 As shown, the high-voltage DC contactor further includes: two transition rings 12 .

[0065] The magnetic steel fixing frame 1 is arranged on the ceramic cover 4 .

[0066] The top of the ceramic cover 4 has four squarely symmetrical metal bosses, of which two metal bosses 401 in the length direction are used to connect the two main contacts 3, and two metal bosses 402 in the width direction are used to braze the two transition rings 12;

[0067] The two auxiliary contact lead terminals 2 are brazed on the two transition rings 12 respectively.

[0068] The two sides of the transition ring are brazed with the auxiliary contact lead-out terminal and the metal boss in the width direction of the top of the ceramic cover to ensure the airtight reliability of the brazing, making the high-voltage DC contactor more stable and reliable.

[0069] In one embodiment, Figure 3 and Figure 4 As shown, both sides of the bottom width direction of the magnetic steel fixing frame 1 have a placement platform 101.

[0070] Wherein, a magnetic steel 5 and a magnetic steel frame 6 are disposed on each placement platform 101 .

[0071] By configuring the magnetic steel fixing frame with placement tables on both sides of the bottom width direction, and placing the magnetic steel frame and the magnet on the placement tables on both sides of the magnetic steel fixing frame, compared with directly configuring the magnetic steel frame and the magnet on the yoke plate, the magnetic circuit connection caused by the magnet being mounted on the yoke plate is avoided, thereby avoiding the loss of magnetic field strength to the yoke plate and improving the magnetic field strength at the contact center.

[0072] In addition, placing the magnets on the placement table can also ensure that the center lines of the two magnets correspond to the center positions of the contacts more reliably, further ensuring the magnetic field strength at the center of the contacts.

[0073] In one embodiment, Figure 3 and Figure 4 As shown, a first air-avoiding portion 102 is provided around the area in the top of the magnetic steel fixing frame 1 that matches with each main contact 3 .

[0074] The two first air-avoiding portions 102 are located between two areas on the top of the magnetic steel fixing frame 1 that match the main contacts 3 .

[0075] The embodiments of the present application do not limit where the first air-avoiding portion 102 is located on the top of the magnetic steel fixing frame 1 , and the specific shape of the first air-avoiding portion 102 .

[0076] In one embodiment, the first air-avoiding portion 102 is located around the area on the top of the magnetic steel fixing frame 1 that matches the main contact 3 and has a semicircular ring shape.

[0077] By setting two first air-avoiding parts between two areas cooperating with the main contacts in the top of the magnetic steel fixing frame, it is convenient to inject insulating adhesive (for example, epoxy adhesive) into the two first air-avoiding parts, thereby ensuring the voltage resistance performance between the two main contacts and between the main contact and the auxiliary contact lead-out terminal.

[0078] In one embodiment, Figure 3 and Figure 4 As shown, both sides of the top width direction of the magnetic steel fixing frame 1 have second air-avoiding portions 103 .

[0079] The embodiments of the present application do not limit where the second gap-avoiding portion 103 is specifically located on both sides in the width direction of the top, and what specific shape the second gap-avoiding portion 103 is.

[0080] In one embodiment, the second avoiding portion 103 is specifically located in the middle of both sides in the width direction of the top, and has a rectangular shape.

[0081] By setting up a second avoidance portion on both sides in the width direction of the top of the magnetic steel fixing frame, the insulating adhesive can be injected from the top between the magnetic steel and the magnetic steel frame through the second avoidance portion, which is conducive to the insulating adhesive to better penetrate between the ceramic cover, the magnetic steel and the magnetic steel frame, and better fix the magnetic steel to prevent the magnetic steel from moving.

[0082] In one embodiment, Figure 2 , Figure 8 , Fig. 9 and Fig.10 The push rod assembly 7 includes a push rod 701 , a spring seat 702 and a plastic part 703 .

[0083] The push rod 701, the spring seat 702 and the plastic part 703 are integrally formed by injection molding.

[0084] The spring seat 702 includes a push rod through hole; the top of the push rod 701 passes through the push rod through hole and is insulated and isolated from the spring seat 702 by the plastic part 703.

[0085] The plastic part 703 has a receiving groove 7031 ; the auxiliary spring 8 is installed in the receiving groove 7031 .

[0086] It should be noted that the spring slot 7032 is used to set the contact spring 908, and the bottom of the spring slot 7032 is the spring seat 702.

[0087] In one embodiment, Figure 8 and Fig. 9 As shown, the auxiliary spring 8 is installed in the receiving groove of the plastic part 703, and is positioned by the four cylindrical bosses of the plastic part 703 and initially fixed by hot riveting. Subsequently, epoxy glue is poured into the receiving groove 7031 and baked and cured at high temperature to achieve mutual insulation and isolation between parts (the push rod 701, the spring seat 702, and the auxiliary spring 8 are insulated and isolated from each other).

[0088] The push rod, the spring seat and the plastic part are integrally formed by injection molding, a receiving groove is provided in the plastic part, and the auxiliary spring is installed in the receiving groove, so that the structure of the push rod assembly and the auxiliary spring is simpler and easier to manufacture, and the installation of the entire high-voltage DC contactor is simpler and easier to operate, thereby reducing the requirements of the high-voltage DC contactor for assembly workers.

[0089] In one embodiment, Figure 2 , Figure 7 and Fig.10 As shown, the armature assembly 9 may include: a fixed plate 901 , an upper armature plastic frame 902 , two supports 903 , an upper armature 904 , a U-shaped bracket 905 , a moving contact piece 906 , a lower armature 907 , and a contact spring 908 .

[0090] The two supports 903 are both connected to the yoke iron plate 10 .

[0091] The fixing plate 901 and the upper armature plastic frame 902 are integrally formed by injection molding, and the fixing plate 901 is fixedly connected to the upper armature 904 .

[0092] The upper armature plastic frame 902 is fixedly connected to the two supports 903 respectively.

[0093] One end of the contact spring 908 is fixedly connected to the lower armature 907 , and the other end is arranged on the push rod assembly 7 .

[0094] The moving contact piece 906 is located between the lower armature 907 and the top of the U-shaped bracket 905 .

[0095] The bottoms of both sides of the U-shaped bracket 905 are connected to the push rod assembly 7 .

[0096] In one embodiment, the fixing plate 901 and the upper armature 904 are fixed by laser welding.

[0097] When a short-circuit current passes through the moving contact piece, the magnetic field generated by the current will magnetize the upper and lower armatures, and the lower armature will be attracted by the upper armature. This attraction and the pressure brought by the contact spring will counteract the contact repulsion generated by the short-circuit current, thereby avoiding the risks of violent arcing, product failure, explosion, etc. caused by the contacts being bounced open. By configuring the armature assembly so that the upper and lower armatures are separated and the upper armature is fixed, the upper armature can be made independent of the push assembly. Therefore, although the upper armature is attracted downward by the lower armature, it will not affect the push assembly, thereby ensuring the reliability of the attraction between the moving iron core and the yoke iron plate.

[0098] In the traditional repulsive magnetic circuit structure, the upper armature and the lower armature are assembled in the moving contact piece assembly, and the gap between the upper and lower armatures is the breaking overtravel of the high-voltage DC contactor (also equal to the overtravel of the high-voltage DC contactor). With the development of high-voltage DC contactors, the overtravel value of the high-voltage DC contactor is required to be large (in order to increase the pressure between the contacts), while the breaking stroke of the high-voltage DC contactor is required to be smaller (in order to increase the suction force between the upper and lower armatures). The traditional anti-repulsive magnetic circuit structure cannot meet these contradictory requirements.

[0099] By configuring the armature assembly in such a way that the upper and lower armatures are separated and the upper armature is fixed, the upper armature can be made independent of the driving assembly. As a result, the armature assembly in this embodiment does not have the problem of insufficient suction force of the upper and lower armatures due to the large overtravel in the traditional repulsive magnetic circuit structure.

[0100] In one embodiment, the gap between the upper and lower armatures can be adjusted by adjusting the thickness of the upper armature 904, thereby improving the short-circuit resistance of the high-voltage DC contactor. For example, the thickness of the upper armature 904 is a preset value, which is determined based on the specific application scenario of the high-voltage DC contactor. When the thickness of the upper armature 904 is the preset value, the short-circuit resistance of the high-voltage DC contactor can be higher, and the distance between the upper and lower armatures can make the upper and lower armatures have a greater attraction.

[0101] In one embodiment, Figure 2 , Figure 8 and Fig. 9 As shown, the push rod assembly 7 includes a spring seat 702 , and both sides of the spring seat 702 have protrusions 7021 .

[0102] The bottoms of both sides of the U-shaped bracket 905 are respectively provided with a riveting through hole 9051 .

[0103] The two riveting through holes 9051 are riveted to the two protrusions 7021 respectively.

[0104] The embodiment of the present application does not limit the specific shape of the riveting through hole 9051. For example, the riveting through hole 9051 is rectangular.

[0105] By arranging protrusions on both sides of the spring seat and arranging riveting through holes on the bottoms of both sides of the U-shaped bracket, the assembly of the armature assembly is made more convenient and quick.

[0106] The contact spring 908 , the lower armature 907 and the moving contact piece 906 are placed above the spring seat 702 exposed in the spring slot 7032 of the plastic part 703 , and then the U-shaped bracket 905 is installed from above, and the riveted through holes 9051 at the bottom of the U-shaped bracket 905 are riveted to the protrusions 7021 on both sides of the spring seat 702 .

[0107] In one embodiment, the upper armature plastic frame 902 and the support 903 are fixedly connected by interference fit.

[0108] The fixing plate and the upper armature plastic frame are integrally formed by injection molding, and the support is installed in the upper armature plastic frame by interference fit, thereby ensuring insulation and isolation between the upper armature and the yoke iron plate.

[0109] In one embodiment, the ceramic cover 4 is fixed on the yoke plate 10. In one embodiment, the ceramic cover 4 and the yoke plate 10 are fixed by sealing the frame on the ceramic cover 4 and the yoke plate 10 by laser welding.

[0110] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope of the present application is indicated by the appended claims.

Claims

1. A high voltage DC contactor, comprising a magnetic steel fixing frame (1), two auxiliary contact lead terminals (2), two main contacts (3), a ceramic cover (4), two magnetic steels (5), two magnetic steel frames (6), a push rod assembly (7), an auxiliary spring (8), an armature assembly (9) and a yoke iron plate (10), characterized in that: Also includes: Two auxiliary contact lead-out pieces (11); The two auxiliary contact lead-out pieces (11) are integrally formed with the magnetic steel fixing frame (1) by injection molding, and the material of the magnetic steel fixing frame (1) is plastic; Each auxiliary contact lead-out piece (11) has a connecting portion (1101), and each auxiliary contact lead-out piece (11) is electrically connected to an auxiliary contact lead-out terminal (2) via the connecting portion (1101); The armature assembly (9) comprises: a fixed plate (901), an upper armature plastic frame (902), two supports (903), an upper armature (904), a U-shaped bracket (905), a movable contact piece (906), a lower armature (907), and a contact spring (908); the two supports (903) are both connected to the yoke plate (10); the fixed plate (901) and the upper armature plastic frame (902) are integrally formed by injection molding; the fixed plate (901) and the upper armature plastic frame (902) are integrally formed by injection molding; The upper armature (904) is fixedly connected; the upper armature plastic frame (902) is fixedly connected to the two supports (903) respectively; one end of the contact spring (908) is fixedly connected to the lower armature (907), and the other end is arranged on the push rod assembly (7); the movable contact piece (906) is located between the lower armature (907) and the top of the U-shaped bracket (905); the bottoms of both sides of the U-shaped bracket (905) are connected to the push rod assembly (7); A first air-avoiding portion (102) is provided around an area in the top of the magnetic steel fixing frame (1) that cooperates with each main contact (3); the two first air-avoiding portions (102) are both located between two areas in the top of the magnetic steel fixing frame (1) that cooperate with the main contact (3); Both sides of the top width direction of the magnetic steel fixing frame (1) have second air-avoiding portions (103).

2. The high voltage DC contactor according to claim 1, characterized in that: The connection portion (1101) is electrically connected to the auxiliary contact lead-out terminal (2) by welding.

3. The high voltage DC contactor according to claim 1, characterized in that: Also includes: two transition rings (12); The magnetic steel fixing frame (1) is arranged on the ceramic cover (4); The top of the ceramic cover (4) has four squarely symmetrical metal bosses, of which two metal bosses (401) in the length direction are used to connect the two main contacts (3), and two metal bosses (402) in the width direction are used to braze two transition rings (12); The two auxiliary contact lead-out terminals (2) are respectively brazed on the two transition rings (12).

4. The high voltage DC contactor according to claim 1, characterized in that: Both sides of the bottom width direction of the magnetic steel fixing frame (1) are provided with a placement platform (101); A magnetic steel (5) and a magnetic steel frame (6) are arranged on each placement platform (101).

5. The high voltage DC contactor according to claim 1, characterized in that: The push rod assembly (7) comprises: a push rod (701), a spring seat (702) and a plastic part (703); The push rod (701), the spring seat (702) and the plastic part (703) are integrally formed by injection molding; The spring seat (702) comprises a push rod through hole; the top of the push rod (701) passes through the push rod through hole and is insulated and isolated from the spring seat (702) by the plastic part (703); The plastic part (703) has a receiving groove (7031); the auxiliary spring (8) is installed in the receiving groove (7031).

6. The high voltage DC contactor according to claim 1, characterized in that: The upper armature plastic frame (902) and the support (903) are fixedly connected in a manner including interference fit.

7. The high voltage DC contactor according to claim 1, characterized in that: The push rod assembly (7) comprises a spring seat (702), and both sides of the spring seat (702) have protrusions (7021); The bottoms of both sides of the U-shaped bracket (905) are respectively provided with a riveting through hole (9051); The two riveting through holes (9051) are riveted to the two protruding portions (7021) respectively.

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