Normally-closed high-voltage direct-current contactor

Abstract

The invention provides a normally-closed high-voltage direct current contactor. The normally-closed high-voltage direct current contactor comprises a transmission rod, the spring sleeve is arranged in the middle of the transmission rod, the armature is installed at one end of the transmission rod, the other end of the transmission rod is connected with the movable contact piece, the movable contact piece is arranged in the upper portion of the shell, the two ends of the movable contact piece make vertical contact with the two static contacts respectively, the static contacts are fixed to the top of the shell, and the armature is arranged in the center of the coil. The coil is fixed in the lower portion of the shell through a coil frame, a magnetic conductive cover is installed in the middle of the shell, a support is arranged on the upper end face of the magnetic conductive cover, a contact spring is arranged between the support and the movable contact piece and sleeved on the transmission rod, a supporting ring is arranged on the lower end face of the magnetic conductive cover, the supporting ring is arranged in the center of the coil, and a return spring is arranged between a spring sleeve and the supporting ring and sleeved on the transmission rod. A completely closed magnetic circuit is arranged on the stroke of the armature, and the conical armature structure is adopted, so that compared with a plane armature, the conical armature structure has higher initial electromagnetic attraction force, and the problem that the electromagnetic attraction force is insufficient under the condition of small size is solved.

Description

Technical Field

[0001] The invention relates to a normally closed high-voltage direct current contactor. Background Art

[0002] The current high-voltage DC contactor, such as the normally closed structure, requires the contact to be in a closed state when the product is de-energized. When returning, the spring needs a large initial pressure to provide the contact pressure and the anti-mechanical environment force of the motion mechanism. The large initial pressure of the return spring must require a relatively large electromagnetic suction force to make the product close in the energized state, which requires a relatively high-power electromagnetic system. However, the requirements of small size and light weight limit the improvement of the electromagnetic system suction force, which brings difficulties to the design of the electromagnetic system. In order to improve the magnetic force of the electromagnetic system, a non-polar high-voltage DC contactor such as CN213781936U discloses a magnetic circuit system formed by a magnetic sleeve, a moving iron core and a coil, but only the magnetic sleeve is connected to the coil around the moving iron core to form a magnetic circuit, and the top of the moving iron core is not within the range of the magnetic circuit, so that the suction force of the magnetic circuit system has not developed to the limit. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a normally closed high-voltage DC contactor.

[0004] The present invention is achieved through the following technical solutions.

[0005] The present invention provides a normally closed high-voltage DC contactor, comprising a transmission rod; a spring sleeve is provided in the middle of the transmission rod, an armature is installed at one end of the transmission rod, and the other end is connected to a moving contact piece, the moving contact piece is arranged in the upper part of a shell, the two ends of the moving contact piece are respectively in vertical contact with two stationary contacts, the stationary contacts are fixed on the top of the shell, the armature is arranged at the center of a coil, the coil is fixed in the lower part of the shell through a coil frame, a magnetic conductive cover is installed in the middle of the shell, a bracket is provided on the upper end surface of the magnetic conductive cover, a contact spring is sleeved on the transmission rod between the bracket and the moving contact piece, a support ring is provided on the lower end surface of the magnetic conductive cover, the support ring is placed in the center of the coil, and a return spring is sleeved on the transmission rod between the spring sleeve and the support ring.

[0006] A magnetic conductive frame is also provided between the coil frame and the outer shell to wrap the outer side and the lower end of the coil frame, a yoke iron ring is provided between the coil frame and the support ring, a bottom hole is processed at the bottom of the magnetic conductive frame, a cap piece is installed in the bottom hole, and a pole shoe is installed on the cap piece; a spring groove is provided on the side surface of the top of the yoke iron ring, and the spring groove is placed in the limiting step at the top of the coil frame.

[0007] The top of the pole shoe is processed into a cone with the same size as the cone guide groove at the bottom of the armature, and a through hole is also processed at the center of the pole shoe.

[0008] The upper part of the shell is buckled with a side ear, the top of the side ear contacts the top cover closed on the top of the shell, the lower end of the side ear is fixedly connected to the welding frame sheet, and the lower end of the welding frame sheet is fixed to the upper end surface of the magnetic conductive cover.

[0009] A partition is provided in the middle of the upper end surface of the top cover, and the static contacts extend into the side ears from the mounting holes on both sides of the partition and are fixedly connected to the side ears.

[0010] The edge of the top cover is also processed with two adjacent wire holes, and the lower end surface of the top cover is also vertically fixed with an arc isolation plate at the inner ends of the two wire holes. The arc isolation plate is parallel to the line connecting the two wire holes and perpendicular to the partition plate.

[0011] The upper end of the outer wall of the bracket is also processed with a supporting step, and the supporting step is in contact with the bottom of the side ear.

[0012] A lower bushing is also provided between the transmission rod and the contact spring. The bottom of the lower bushing is a disc with the same diameter as the guide cylinder processed in the center of the bracket. A spring groove is processed on the upper edge of the disc. The upper part of the lower bushing is conical, and a slot is processed in the center of the cone.

[0013] An upper bushing is provided between the moving contact piece and the transmission rod. The upper bushing is a cylinder with an inverted trapezoidal cross section. The lower end of the upper bushing extends into the center of the moving contact piece and the slot in turn, and the upper end contacts the fixing ring, which is fixed to the end of the transmission rod.

[0014] The outer end of the shell is also relatively fixed with two side ears.

[0015] The beneficial effects of the present invention are: a completely closed magnetic circuit is provided in the stroke of the armature, and by adopting a conical armature structure, a higher initial electromagnetic attraction is provided compared with a planar armature, thereby solving the problem of insufficient electromagnetic attraction under small volume conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 It is a schematic structural diagram of the housing of the present invention;

[0018] Figure 3 It is a structural schematic diagram of the magnetic conductive frame of the present invention;

[0019] Figure 4 It is a structural schematic diagram of the coil frame of the present invention;

[0020] Figure 5 It is a structural schematic diagram of the yoke iron ring of the present invention;

[0021] Figure 6 It is a structural schematic diagram of a welding frame piece of the present invention;

[0022] Figure 7 It is a schematic diagram of the structure of the support of the present invention;

[0023] Figure 8 It is a schematic diagram of the structure of the top cover of the present invention;

[0024] Fig. 9 It is a structural schematic diagram of the static contact of the present invention;

[0025] Fig.10 It is a structural schematic diagram of the fixing ring of the present invention;

[0026] Fig.11 It is a schematic diagram of the structure of the ceramic cover of the present invention;

[0027] Fig.12 It is a structural schematic diagram of the upper bushing of the present invention;

[0028] Fig.13 It is a schematic structural diagram of the movable contact piece of the present invention;

[0029] Fig.14 It is a structural schematic diagram of the lower bushing of the present invention;

[0030] Fig.15 It is a structural schematic diagram of the transmission rod of the present invention;

[0031] Fig.16 It is a structural schematic diagram of the magnetic conductive cover of the present invention;

[0032] Fig.17 It is a structural schematic diagram of the support ring of the present invention;

[0033] Fig.18 It is a structural schematic diagram of the armature of the present invention;

[0034] Fig.19 It is a schematic diagram of the structure of the pole shoe of the present invention;

[0035] In the figure: 1-housing, 11-side ear, 2-magnetic frame, 201-bottom hole, 3-coil, 4-coil frame, 41-limiting step, 5-yoke iron ring, 51-limiting ring, 6-welding frame, 7-bracket, 71-guide cylinder, 72-supporting step, 8-top cover, 81-partition plate, 82-mounting hole, 83-arc isolation plate, 84-wire hole, 9-static contact, 10-fixing ring, 11-ceramic cover, 111- Static contact fixing hole, 12-upper bushing, 13-moving contact piece, 14-contact spring, 15-lower bushing, 151-spring groove, 152-card groove, 16-transmission rod, 161-spring sleeve, 17-return spring, 18-magnetic cover, 19-support ring, 191-positioning step, 20-armature, 2001-conical guide groove, 21-armature cover, 22-pole shoe, 23-cap piece, 24-magnetic bottom ring. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0037] like Figure 1 As shown, a normally closed high-voltage DC contactor includes a transmission rod 16; a spring sleeve 161 is provided in the middle of the transmission rod 16, one end of the transmission rod 16 is installed with an armature 20, and the other end is connected to a moving contact piece 13, the moving contact piece 13 is arranged in the upper part of the housing 1, and the two ends of the moving contact piece 13 are respectively in vertical contact with two stationary contacts 9, the stationary contacts 9 are fixed on the top of the housing 1, and the moving contact 13 is a rectangular structure made of copper alloy, and is installed on the transmission rod 16 through an upper bushing 12. When the product is in a de-energized state, its upper surface contacts the stationary contact 9 to realize the de-energized connection function of the product. In the energized state, it moves downward with the upper bushing 12 and the transmission rod 16, and is disconnected from the stationary contact 9 to realize the energized disconnection function of the product. The armature 20 is a conical connection structure, which can provide a relatively large electromagnetic attraction for the electromagnetic system under the limitation of small volume. When de-energized, the transmission rod 16 is in an upper position under the action of the return spring 17. When the product is excited, the electromagnetic attraction generated by the pole shoe 22 causes it to move downward, and drives the transmission rod 16, the moving contact 13 and other components to move downward together, so that the contacts are separated, realizing the product's attraction action, that is, the product excitation is disconnected.

[0038] like Fig.15 As shown, the transmission rod 16 is made of metal and serves as a transmission component of the product movement mechanism. One end is connected to the armature 20. As the armature 20 moves downward under the electromagnetic attraction, the movement is transmitted to the moving contact 13 installed at the other end, so that the moving contact 13 is separated from the static contact 9 to realize the product's excitation disconnection function. When the armature 20 moves upward, the movement is transmitted, so that the moving contact 13 contacts the static contact 9, and the product's de-excitation connection function is realized. The armature 20 is arranged at the center of the coil 3, and the coil 3 is fixed in the lower part of the housing 1 through the coil frame 4. A magnetic cover 18 is installed in the middle of the housing 1. The magnetic cover 18 is made of electromagnetic pure iron and serves as a part of the magnetic circuit to provide a medium for magnetic flux transmission. The upper end surface of the magnetic cover 18 is provided with a bracket 7. There is a contact spring 14 between the bracket 7 and the moving contact piece 13, which is sleeved on the transmission rod 16. The lower end surface of the magnetic cover 18 is provided with a support ring 19. The support ring 19 is made of electromagnetic pure iron and serves as a part of the magnetic circuit to provide a medium for magnetic flux transmission. The support ring 19 is placed at the center of the coil 3, and a return spring 17 is arranged between the spring sleeve 161 and the support ring 19 and is sleeved on the transmission rod 16. The return spring 17 is made of spring steel wire, one end of which is installed on the transmission rod 16, and the other end cooperates with the support ring 19. When de-energized, it is in a compressed state, providing upward pressure for the transmission rod 16, thereby providing contact pressure for the moving contact 13 and the static contact 9, and also providing reaction force for the moving parts to resist mechanical environmental loads.

[0039] Furthermore, a magnetic conductive frame 2 is provided between the coil frame 4 and the outer shell 1 to wrap the outer side and the lower end of the coil frame 4, and a yoke iron ring 5 is provided between the coil frame 4 and the support ring 19. A bottom hole 201 is processed at the bottom of the magnetic conductive frame 2, a cap piece 23 is installed in the bottom hole 201, and a pole shoe 22 is installed on the cap piece 23; a spring groove 151 is provided on the top side of the yoke iron ring 5, and the spring groove 151 is placed in the limiting step 41 at the top of the coil frame 4. The magnetic frame 2 is a cylindrical structure made of electromagnetic pure iron, and forms a magnetic circuit with the magnetic cover 18, the yoke iron ring 5, the magnetic bottom ring 24, the cap piece 23, the pole shoe 22, and the armature 20. The inner cavity is installed with a coil 3. When the coil is energized, the magnetic circuit has the characteristic of being closed, so that the armature 20 moves downward to complete the closure of the magnetic circuit. At the same time, the transmission rod 16 installed at the end of the armature 20 moves therewith, and the moving contact 13 installed on the transmission rod 16 also moves downward and separates from the static contact 9, realizing the product disconnection function, and the product completes the suction process.

[0040] Further, such as Fig.18 As shown, the top of the pole shoe 22 is processed into a cone with the same size as the cone-shaped guide groove 2001 at the bottom of the armature 20, and a through hole is also processed in the center of the pole shoe 22.

[0041] like Figure 7 As shown, the bracket 7 is made of plastic and has certain arc isolation and welding spatter prevention functions.

[0042] like Figure 8 As shown, the top cover 8 is made of plastic and cooperates with the outer shell 1 to form a closed cavity to protect the interior of the product.

[0043] like Fig. 9 As shown, the static contact 9 is a cylindrical structure made of copper alloy and is mounted on the ceramic part 11 by welding. One end forms a contact system with the moving contact 13, and the other end extends out of the upper part of the product and has a thread, serving as the connection end of the load circuit.

[0044] like Fig.10 As shown, the fixing ring 10 is an annular structure, made of metal, and is installed on the upper end of the transmission rod 16 to limit the upper bushing 12 installed on the transmission rod 16, thereby limiting the moving contact 13.

[0045] like Fig.11 As shown, the ceramic part 11 is a square cavity structure made of ceramic, and is welded with the frame 6, the static contact 9, the magnetic conductor 12, the magnetic ring 15, and the armature cover 21 through a welding process to form a sealed cavity, providing a sealed environment for the contact system.

[0046] like Fig.12As shown, the upper bushing 12 is a stepped circular tube structure made of plastic and is used for positioning, installing and guiding the moving contact 13 , while providing insulation for the transmission rod 16 and the moving contact 13 .

[0047] like Fig.13 As shown, the moving contact 13 is a rectangular structure made of copper alloy and is installed on the transmission rod 16 through the upper bushing 12. When the product is in a de-energized state, its upper surface contacts the static contact 9 to realize the de-energized connection function of the product. In the energized state, it moves downward with the upper bushing 12 and the transmission rod 16 and disconnects from the static contact 9 to realize the energized disconnection function of the product.

[0048] The contact spring 14 is made of spring steel wire, installed between the moving contact 13 and the lower bushing 15, and provides contact pressure for the moving contact system through compression.

[0049] like Fig.14 As shown, the lower bushing 15 is a stepped circular tube structure made of plastic, which provides a guide for the contact spring 14 and provides insulation between the transmission rod 16 and the contact spring 14 .

[0050] like Fig.15 As shown, the transmission rod 16 is made of metal and serves as a transmission component of the product movement mechanism. One end is connected to the armature 20. As the armature 20 moves downward under the electromagnetic attraction, the motion is transmitted to the moving contact 13 installed at the other end, so that the moving contact 13 is separated from the static contact 9 to realize the excitation disconnection function of the product. When the armature 20 moves upward, the motion is transmitted to make the moving contact 13 contact with the static contact 9 to realize the de-excitation connection function of the product.

[0051] The return spring 17 is made of spring steel wire, one end of which is mounted on the transmission rod 16 and the other end cooperates with the support ring 19. When de-energized, it is in a compressed state, providing upward pressure to the transmission rod 16, thereby providing contact pressure for the moving contact 13 and the static contact 9, and also providing a reaction force for the moving parts to resist mechanical environmental loads.

[0052] like Fig.16 As shown, the magnetic conductive cover 18 is made of electromagnetic pure iron and serves as a part of the magnetic circuit to provide a medium for magnetic flux transmission.

[0053] like Fig.17 As shown, the support ring 19 is made of electromagnetic pure iron and serves as a part of the magnetic circuit to provide a medium for magnetic flux transmission.

[0054] The armature cover 21 is made of metal, and together with the ceramic component 11, the magnetic conductive cover 18 and other components, forms a sealed cavity to provide a sealed environment for the contact system.

[0055] The pole shoe 22 is made of electromagnetic pure iron, as part of the magnetic circuit, providing a medium for magnetic flux transfer. The cap piece 23 is made of electromagnetic pure iron, as part of the magnetic circuit, providing a medium for magnetic flux transfer. The magnetic bottom ring 24 is made of electromagnetic pure iron, as part of the magnetic circuit, providing a medium for magnetic flux transfer. The above components cooperate with each other to form a normally closed high-voltage DC contactor.

Claims

1. A normally closed high voltage DC contactor, comprising a transmission rod (16), characterized in that: A spring sleeve (161) is provided in the middle of the transmission rod (16), an armature (20) is installed at one end of the transmission rod (16), and the other end is connected to a moving contact piece (13), the moving contact piece (13) is arranged in the upper part of the housing (1), the two ends of the moving contact piece (13) are respectively in vertical contact with two stationary contacts (9), the stationary contacts (9) are fixed to the top of the housing (1), the armature (20) is arranged at the center of the coil (3), and the coil (3) is fixed by a coil frame (4). A magnetic conductive cover (18) is installed in the middle of the housing (1) in the lower part of the housing (1), a bracket (7) is provided on the upper end surface of the magnetic conductive cover (18), a contact spring (14) is sleeved on the transmission rod (16) between the bracket (7) and the movable contact piece (13), a support ring (19) is provided on the lower end surface of the magnetic conductive cover (18), the support ring (19) is placed at the center of the coil (3), and a return spring (17) is sleeved on the transmission rod (16) between the spring sleeve (161) and the support ring (19).

2. The normally closed high voltage DC contactor according to claim 1, characterized in that: A magnetic conductive frame (2) is also provided between the coil frame (4) and the housing (1) to wrap the outer side and lower end of the coil frame (4); a yoke iron ring (5) is provided between the coil frame (4) and the support ring (19); a bottom hole (201) is processed on the bottom of the magnetic conductive frame (2); a cap piece (23) is installed in the bottom hole (201); and a pole shoe (22) is installed on the cap piece (23); a spring groove (151) is provided on the side surface of the top of the yoke iron ring (5); the spring groove (151) is placed in a limiting step (41) at the top of the coil frame (4).

3. The normally closed high voltage DC contactor according to claim 2, characterized in that: The top of the pole shoe (22) is processed into a cone shape with the same size as the cone guide groove (2001) at the bottom of the armature (20), and a through hole is also processed in the center of the pole shoe (22).

4. The normally closed high voltage DC contactor according to claim 1, characterized in that: A side ear (11) is inverted inside the upper part of the shell (1), the top of the side ear (11) is in contact with a top cover (8) sealed on the top of the shell (1), the lower end of the side ear (11) is fixedly connected to a welding frame sheet (6), and the lower end of the welding frame sheet (6) is fixed to the upper end surface of the magnetic conductive cover (18).

5. The normally closed high voltage DC contactor according to claim 4, characterized in that: A partition plate (81) is provided in the middle of the upper end surface of the top cover (8), and the static contact (9) extends into the side ear (11) through the mounting holes (82) on both sides of the partition plate (81) and is fixedly connected to the side ear (11).

6. The normally closed high voltage DC contactor according to claim 5, characterized in that: The edge of the top cover (8) is also processed with two adjacent wire holes (84), and the lower end surface of the top cover (8) is also vertically fixed with an arc isolation plate (83) at the inner ends of the two wire holes (84), and the arc isolation plate (83) is parallel to the connecting line of the two wire holes (84) and perpendicular to the partition plate (81).

7. The normally closed high voltage DC contactor according to claim 1, characterized in that: The upper end of the outer wall of the bracket (7) is also processed with a support step (72), and the support step (72) is in contact with the bottom of the side ear (11).

8. The normally closed high voltage DC contactor according to claim 1, characterized in that: A lower bushing (15) is also provided between the transmission rod (16) and the contact spring (14); the bottom of the lower bushing (15) is in the shape of a disc having the same diameter as the guide cylinder (71) processed at the center of the bracket (7); a spring groove (151) is processed at the upper edge of the disc; the upper portion of the lower bushing (15) is in the shape of a cone; a clamping groove (152) is processed at the center of the cone.

9. The normally closed high voltage DC contactor according to claim 1, characterized in that: An upper bushing (12) is provided between the movable contact piece (13) and the transmission rod (16). The upper bushing (12) is a cylinder with an inverted trapezoidal cross section. The lower end of the upper bushing (12) extends into the center of the movable contact piece (13) and the slot (152) in sequence, and the upper end contacts the fixing ring (10). The fixing ring (10) is fixed to the end of the transmission rod (16).

10. The normally closed high voltage DC contactor according to claim 1, characterized in that: The outer end of the housing (1) is also relatively fixedly connected with two side ears (11).

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