Column type ceramic sealing type high-voltage direct-current contactor with auxiliary contact

Abstract

The utility model discloses a column type ceramic sealing type high-voltage direct current contactor with an auxiliary contact, which comprises a shell, the top of the shell is buckled with a cover plate, and the cover plate is provided with a positioning hole and a glue injection port; the cover plate is provided with a check ring along the circumferential edge, and a plurality of positioning ribs are evenly distributed on the check ring and embedded into the clamping grooves. A contact system is arranged in an inner cavity of the shell, and a gap between the contact system and the shell is filled with epoxy glue; the contact system comprises a sleeve, a ceramic cover is buckled and welded to the top of the sleeve, static contacts are symmetrically arranged on the ceramic cover and penetrate through a pair of through holes symmetrically formed in the top of an arc extinguishing cover assembly arranged below the ceramic cover, and the arc extinguishing cover assembly covers a moving iron assembly arranged below the arc extinguishing cover assembly. According to the utility model, through the structural design of the cover plate and the shell, the defect of glue overflow during glue pouring of the whole machine is overcome, and meanwhile, the potting glue has the effects of good heat dissipation effect and high fixing strength; and ceramic packaging is adopted, so that the product has the capability of sealing a small molecule arc extinguishing medium.

Description

Technical Field

[0001] The utility model relates to the technical field of DC contactors, in particular to a columnar ceramic sealed high-voltage DC contactor with auxiliary contacts. Background Art

[0002] High-voltage DC contactor is a switching device used in DC transmission systems, which can quickly disconnect and connect circuits under high voltage and high current environments. At present, high-voltage DC contactors on the market are divided into two types according to the sealing form: glue-sealed type (column type) and ceramic type (square type). The glue-sealed type can realize the auxiliary contact function but the performance is relatively low, and the ceramic type has more reliable performance but no auxiliary contact function. With the development of the new energy industry, the performance of single glue-sealed high-voltage DC contactors can no longer meet the requirements of the market. The sealing performance of single glue-sealed products is mainly guaranteed by cured epoxy glue. The sealing of epoxy glue is lower than that of ceramic packaging products, and the arc extinguishing ability and aging resistance are poor; while the single ceramic product has good sealing performance, high structural strength, strong arc extinguishing ability, but cannot realize the auxiliary contact function, and the market applicability is not strong.

[0003] The utility model creatively proposes a ceramic sealed high voltage DC contactor with auxiliary contacts, which comprehensively utilizes the respective advantages of ceramic and glue sealed contactors, optimizes the design of the contact system while ensuring that the columnar shape remains unchanged, realizes the auxiliary contact function and achieves the ceramic sealing capability at the same time. Utility Model Content

[0004] The utility model aims to provide a column-type ceramic sealed high-voltage DC contactor with auxiliary contacts to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A columnar ceramic sealed high-voltage DC contactor with auxiliary contacts, comprising a cylindrical shell with a plurality of positioning grooves evenly arranged in the circumferential direction on the top, a cover plate fastened on the top of the shell, a pair of positioning holes and a pair of glue injection ports symmetrically arranged on the cover plate, the center lines of the positioning holes and the center lines of the glue injection ports being perpendicular to each other; a retaining ring perpendicular to the cover plate is arranged along the circumferential edge of the cover plate, a plurality of positioning ribs in the same orientation as the positioning grooves are evenly arranged on the retaining ring, and the positioning ribs are embedded in the positioning grooves; a plurality of convex hulls are evenly arranged on the retaining ring, and the convex hulls are interference fit with the shell;

[0007] A contact system is installed in the inner cavity of the shell, and the gap between the contact system and the shell is filled with epoxy glue;

[0008] The contact system includes a sleeve, a ceramic cover is buckled and welded on the top of the sleeve, a pair of static contacts are symmetrically arranged on the ceramic cover, the static contacts pass through a pair of through holes symmetrically opened on the top of the arc extinguishing cover assembly arranged below the ceramic cover, the arc extinguishing cover assembly covers a moving iron assembly arranged below the arc extinguishing cover assembly, the moving iron assembly includes a moving contact end arranged at the upper part, the lower part of the moving contact end is connected to the moving iron end, the moving iron end penetrates into the center of the coil surrounding the inner wall of the bottom of the sleeve so that the magnetic conductive plate at the bottom of the moving contact end is flush with the coil; a magnetic conductive part is provided between the moving iron end and the coil; a terminal block extending upward is connected above the coil, and the terminal block is welded to a pair of control terminals arranged along the edge of the ceramic cover.

[0009] Preferably, the ceramic cover includes a ceramic part and a connecting ring arranged at the bottom folded edge connection end of the ceramic part, a feedback terminal is also arranged on the side opposite to the control terminal of the ceramic part, an exhaust pipe is arranged between the feedback terminals, and the static contacts are symmetrically arranged on the ceramic part.

[0010] Preferably, the arc extinguishing cover assembly includes an arc extinguishing cover, a pair of terminal holes are provided on the top edge of the cover shell of the arc extinguishing cover, a concave groove is provided on the side end of the cover shell, and a pair of positioning columns are provided on the central side wall of the concave groove; a travel switch is also embedded in the concave groove, a positioning block is provided at the lower part of the travel switch, a mounting hole is provided on the positioning block, the mounting hole is plugged into the positioning column, a common terminal and a normally open terminal are provided on the top of the positioning block, the common terminal is welded to the common end on the circuit board arranged on the upper part of the positioning block, and the normally open terminal is welded to the normally open end on the circuit board.

[0011] Preferably, the central axes of the moving contact end at the upper part of the moving iron assembly and the moving iron end at the lower part coincide with each other and are connected by a push rod penetrating the central axis; the moving contact end at the upper part of the moving iron assembly comprises a circular magnetic conductive plate, a support member is connected to the magnetic conductive plate, a circular through hole is opened in the center of the support member, and slots are provided at both ends, a cantilever rod is connected to one end of the slot, a moving contact is held in the slot, and pads connected to the magnetic conductive plate are provided at both ends of the moving contact; the moving iron end comprises a cylindrical moving iron, a reaction spring is inserted into the exposed gap between the push rod connecting the moving contact end and the moving iron end, and a contact spring is inserted between the push rod connecting the support member and the magnetic conductive plate.

[0012] Preferably, the bottom of the push rod extends out from the bottom of the moving iron and a retaining ring is connected between the moving iron, and the top of the push rod extends out from the top of the moving contact and a retaining ring is also provided between the moving contact.

[0013] Preferably, the gasket is a rectangular cavity structure, the gasket is processed with anti-misalignment angles around the gasket, and magnetic steel is inserted into the cavity along the anti-misalignment angles.

[0014] The working process of the utility model is:

[0015] After a certain electrical signal is applied to the control terminal, the electromagnetic coil is energized, and the electromagnetic coil generates a magnetic field through electromagnetic induction. Under the action of electromagnetic attraction, the armature moves toward the magnetic guide plate along the axial direction of the push rod, and the push rod and the armature are in a linkage mode. The moving contact moves toward the static contact through the moving iron assembly. When the moving contact is in reliable contact with the static contact, the reaction spring and the contact spring are compressed to the working state, and the support fixed on the moving contact drives the travel switch to be turned on at the same time. At this time, the entire power supply system is reliably connected; when the electromagnetic coil loses power, the electromagnetic attraction disappears, the reaction spring resets to the initial state, the armature is released, the moving contact is separated from the static contact, the travel switch is disconnected, and the external circuit is cut off.

[0016] The beneficial effects of the utility model are:

[0017] (1) The utility model solves the problem of glue overflow during glue filling of the whole machine through the structural design and matching mode of the cover plate and the shell. At the same time, the filling glue has a good heat dissipation effect and high fixing strength. The use of ceramic packaging and laser welding technology enables the product to achieve the ability to seal small molecule arc extinguishing media and improve the ability to interrupt the arc. The terminal adopts an iron-nickel-cobalt alloy material with good conductivity, easy processing and convenient brazing, which ensures the reliable transmission of small current signals, optimizes the overall structure of the ceramic cover, and improves the brazing quality.

[0018] (2) In the utility model, the travel switch is reliably fixed on the arc extinguishing cover and connected to the feedback terminal by welding on the circuit board. The tight fit between the support member and the moving contact ensures the linkage mode of the two parts. When the coil is energized, the support member drives the travel switch and the main contact to be connected at the same time under the action of electromagnetic force. When the coil is de-energized, the travel switch and the main contact are disconnected at the same time under the reaction of the spring force, thereby realizing the synchronous linkage of the main contact and the auxiliary contact. The non-polar arc extinguishing principle is adopted so that the main circuit wiring is not restricted by the positive and negative poles, and the operation is more convenient.

[0019] (3) The utility model adopts an error-proof design around the liner to ensure zero error in the magnetic steel assembly and more efficient.

[0020] (4) The overall structural design of the utility model is compact and reasonable, and the operation is efficient and reliable; the various components of the contact system are closely matched, and it has both the good sealing performance of the ceramic sealed high-voltage DC contactor and provides auxiliary contact functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the cover plate and shell structure of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the contact system of the utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the ceramic cover of the utility model;

[0025] Figure 5 This is a schematic diagram of the arc extinguishing cover assembly of the utility model;

[0026] Figure 6 This is the front view of the moving iron assembly of the utility model;

[0027] Figure 7 This is an axial side view of the movable iron assembly of the utility model;

[0028] In the figure: 1, contact system, 2, cover plate, 3, shell, 4, epoxy glue, 5, ceramic cover, 6, arc extinguishing cover assembly, 7, moving iron assembly, 8, coil, 9, magnetic conductive part, 10, sleeve, 11, ceramic part, 12, static contact, 13, connecting ring, 14, exhaust pipe, 15, feedback terminal, 16, control terminal, 17, arc extinguishing cover, 18, circuit board, 19, travel switch, 20, support, 21, moving contact, 22, gasket, 23, magnetic steel, 2 4. Push rod, 25. Contact spring, 26. Magnetic plate, 27. Reaction spring, 28. Armature, 29. Retaining ring, 201. Positioning hole, 202. Positioning rib, 203. Bump, 204. Glue injection port, 301. Positioning groove, 801. Terminal block, 1701. Positioning column, 1702. Terminal hole, 1901. Mounting hole, 1902. Common terminal, 1903. Normally open terminal, 2001. Slot, 2002. Cantilever rod, 2201. Anti-misalignment. DETAILED DESCRIPTION

[0029] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0030] like Figure 1-7 A columnar ceramic sealed high-voltage DC contactor with auxiliary contacts shown in the figure comprises a cylindrical shell 3 with a plurality of positioning grooves 301 uniformly provided at the top along the annular direction, a cover plate 2 is buckled on the top of the shell 3, a pair of positioning holes 201 and a pair of glue injection ports 204 are symmetrically provided on the cover plate 2, and the center lines of the positioning holes 201 and the center lines of the glue injection ports 204 are perpendicular to each other; a retaining ring perpendicular to the cover plate 2 is provided along the circumferential edge of the cover plate 2, and a plurality of positioning ribs 202 are uniformly distributed on the retaining ring, which are consistent with the orientation of the positioning grooves 301, and the positioning ribs 202 are embedded in the positioning grooves 301; a plurality of convex bumps 203 are also uniformly distributed on the retaining ring, and the convex bumps 203 are interference fit with the shell 3;

[0031] A contact system 1 is installed in the inner cavity of the housing 3, and the gap between the contact system 1 and the housing 3 is filled with epoxy glue 4;

[0032] The contact system 1 includes a sleeve 10, the top of which is buckled and welded with a ceramic cover 5, a pair of static contacts 12 are symmetrically arranged on the ceramic cover 5, the static contacts 12 pass through a pair of through holes symmetrically opened on the top of an arc extinguishing cover assembly 6 arranged below the ceramic cover 5, the arc extinguishing cover assembly 6 covers a moving iron assembly 7 arranged below the arc extinguishing cover assembly 6, the moving iron assembly 7 includes a moving contact end arranged at the upper part, the lower part of the moving contact end is connected to the moving iron end, the moving iron end penetrates into the center of the coil 8 surrounding the inner wall of the bottom of the sleeve 10 so that the magnetic conductive plate 26 at the bottom of the moving contact end is flush with the coil 8; a magnetic conductive part 9 is provided between the moving iron end and the coil 8; a terminal block 801 extending upward is connected above the coil 8, and the terminal block 801 is welded to a pair of control terminals 16 arranged along the edge of the ceramic cover 5.

[0033] The ceramic cover 5 includes a ceramic part 11 and a connecting ring 13 arranged at the bottom folded edge connection end of the ceramic part 11. A feedback terminal 15 is also arranged on the opposite side of the control terminal 16 of the ceramic part 11. An exhaust pipe 14 is arranged between the feedback terminals 15. The static contacts 12 are symmetrically arranged on the ceramic part 11.

[0034] The arc extinguishing cover assembly 6 includes an arc extinguishing cover 17, a pair of terminal holes 1702 are provided on the top edge of the cover shell of the arc extinguishing cover 17, a concave groove is provided on the side end of the cover shell, and a pair of positioning columns 1701 are provided on the central side wall of the concave groove; a travel switch 19 is also embedded in the concave groove, a positioning block is provided at the lower part of the travel switch 19, a mounting hole 1901 is provided on the positioning block, the mounting hole 1901 is plugged with the positioning column 1701, a common terminal 1902 and a normally open terminal 1903 are provided on the top of the positioning block, the common terminal 1902 is welded to the common end on the circuit board 18 arranged on the upper part of the positioning block, and the normally open terminal 1903 is welded to the normally open end on the circuit board 18.

[0035] The central axes of the moving contact end at the upper part of the moving iron assembly 7 and the moving iron end at the lower part coincide with each other and are connected by a push rod 24 penetrating the central axis. The moving contact end at the upper part of the moving iron assembly 7 includes a circular magnetic conductive plate 26, and a support member 20 is connected to the magnetic conductive plate 26. A circular through hole is opened in the center of the support member 20, and a slot 2001 is provided at both ends. A cantilever rod 2002 is connected to one end of the slot 2001, and a moving contact 21 is held in the slot 2001. Pads 22 connected to the magnetic conductive plate 26 are provided at both ends of the moving contact 21; the moving iron end includes a cylindrical moving iron 28, and a reaction spring 27 is inserted into the exposed gap between the push rod 24 connecting the moving contact end and the moving iron end, and a contact spring 25 is inserted between the push rod 24 connecting the support member 20 and the magnetic conductive plate 26.

[0036] The bottom of the push rod 24 extends out from the bottom of the moving iron 28 and a retaining ring 29 is connected between the moving iron 28 . The top of the push rod 24 extends out from the top of the moving contact 21 and a retaining ring 29 is also provided between the moving contact 21 .

[0037] The liner 22 is a rectangular cavity structure, and anti-misalignment corners 2201 are processed around the liner 22, and a magnetic steel 23 is inserted into the cavity along the anti-misalignment corners 2201.

[0038] The working process of the utility model is:

[0039] After a certain electrical signal is applied to the control terminal 16, the electromagnetic coil 8 is energized, and the electromagnetic coil 8 generates a magnetic field through electromagnetic induction. The armature 28 moves toward the magnetic guide plate along the axial direction of the push rod 24 under the action of the electromagnetic attraction, and the push rod and the armature are in a linkage mode. The moving contact 21 moves toward the static contact through the moving iron assembly 7. When the moving contact 21 is in reliable contact with the static contact 12, the reaction spring 27 and the contact spring 25 are compressed to the working state, and the support 20 fixed on the moving contact 21 drives the travel switch 19 to be turned on at the same time. At this time, the entire power supply system is reliably turned on; when the electromagnetic coil loses power 8, the electromagnetic attraction disappears, the reaction spring 27 resets to the initial state, the armature 28 is released, the moving contact 21 is separated from the static contact 12, the travel switch 19 is disconnected, and the external circuit is cut off.

[0040] The utility model solves the defect of glue overflow during glue filling of the whole machine through the structural design and matching mode of the cover plate and the shell, and the filling glue has the effect of good heat dissipation effect and high fixing strength; the ceramic packaging and laser welding technology are adopted to enable the product to realize the ability of sealing small molecule arc extinguishing medium, and improve the ability of breaking the arc; the terminal adopts the iron-nickel-cobalt alloy material with good conductivity, easy processing and convenient brazing to ensure the reliable transmission of small current signals, optimize the overall structure of the ceramic cover, and improve the brazing quality; the travel switch is reliably fixed on the arc extinguishing cover and connected to the feedback terminal through circuit board welding, and the tight fitting assembly of the support and the moving contact ensures the linkage mode of the two parts. When the coil is energized, the support drives the travel switch and the main contact to be connected at the same time under the action of electromagnetic force. When the coil is de-energized, the travel switch and the main contact are disconnected at the same time under the reaction of the spring force, realizing the synchronous linkage of the main contact and the auxiliary contact; the polarity-free arc extinguishing principle is adopted to make the main circuit wiring not restricted by the positive and negative poles, and the operation is more convenient.

[0041] The above are only preferred examples of the present invention. It should be pointed out that for ordinary technicians in this field, under the technical inspiration provided by the present invention, as common knowledge in the electrical field, other equivalent variations and improvements can be made, which should also be regarded as the protection scope of the present invention.

Claims

1. A columnar ceramic sealed high voltage DC contactor with auxiliary contacts, characterized in that: The invention comprises a cylindrical shell (3) having a plurality of positioning grooves (301) uniformly provided at the top along the circumferential direction, a cover plate (2) being buckled on the top of the shell (3), a pair of positioning holes (201) and a pair of glue injection ports (204) being symmetrically provided on the cover plate (2), the center lines of the positioning holes (201) and the center lines of the glue injection ports (204) being perpendicular to each other; a retaining ring perpendicular to the cover plate (2) is provided along the circumferential edge of the cover plate (2), a plurality of positioning ribs (202) uniformly provided on the retaining ring and being aligned with the positioning grooves (301), the positioning ribs (202) being embedded in the positioning grooves (301); a plurality of convex hulls (203) being uniformly provided on the retaining ring, the convex hulls (203) being interference fit with the shell (3); A contact system (1) is installed in the inner cavity of the shell (3), and the gap between the contact system (1) and the shell (3) is filled with epoxy glue (4); The contact system (1) comprises a sleeve (10), the top of the sleeve (10) is buckled and welded with a ceramic cover (5), a pair of stationary contacts (12) are symmetrically arranged on the ceramic cover (5), the stationary contacts (12) pass through a pair of through holes symmetrically opened on the top of an arc extinguishing cover assembly (6) arranged below the ceramic cover (5), the arc extinguishing cover assembly (6) covers a moving iron assembly (7) arranged below the arc extinguishing cover assembly (6), the moving iron assembly (7) comprises a moving contact end arranged at the top, the lower part of the moving contact end is connected to the moving iron end, the moving iron end penetrates the center of a coil (8) surrounding the inner wall of the bottom of the sleeve (10) so that the magnetic conductive plate (26) at the bottom of the moving contact end is flush with the coil (8); a magnetic conductive member (9) is arranged between the moving iron end and the coil (8); a terminal block (801) extending upward is connected to the top of the coil (8), and the terminal block (801) is welded to a pair of control terminals (16) arranged along the edge of the ceramic cover (5).

2. A columnar ceramic sealed high voltage DC contactor with auxiliary contacts according to claim 1, characterized in that: The ceramic cover (5) comprises a ceramic part (11) and a connection ring (13) arranged at the bottom folded edge connection end of the ceramic part (11); a feedback terminal (15) is also arranged on the side of the ceramic part (11) opposite to the control terminal (16); an exhaust pipe (14) is arranged between the feedback terminals (15); and the static contacts (12) are symmetrically arranged on the ceramic part (11).

3. A columnar ceramic sealed high voltage DC contactor with auxiliary contacts according to claim 1 or 2, characterized in that: The arc extinguishing hood assembly (6) comprises an arc extinguishing hood (17), a pair of terminal holes (1702) are provided on the top edge of the hood shell of the arc extinguishing hood (17), a concave groove is provided on the side end of the hood shell, and a pair of positioning columns (1701) are provided on the central side wall of the concave groove; a travel switch (19) is also embedded in the concave groove, a positioning block is provided at the bottom of the travel switch (19), a mounting hole (1901) is provided on the positioning block, the mounting hole (1901) is plugged with the positioning column (1701), a common terminal (1902) and a normally open terminal (1903) are provided at the top of the positioning block, the common terminal (1902) is welded to the common end on the circuit board (18) arranged on the top of the positioning block, and the normally open terminal (1903) is welded to the normally open end on the circuit board (18).

4. A column-type ceramic sealed high-voltage DC contactor with auxiliary contacts according to claim 3, characterized in that: The central axes of the moving contact end at the upper part of the moving iron assembly (7) and the moving iron end at the lower part coincide with each other and are connected via a push rod (24) penetrating the central axis. The moving contact end at the upper part of the moving iron assembly (7) comprises a circular magnetic conductive plate (26). The magnetic conductive plate (26) is connected to a support member (20). The support member (20) has a circular through hole at its center and slots (2001) at both ends. One end of the slot (2001) is connected to a cantilever rod (2002). The slot (2001) holds a moving contact (21). Both ends of the moving contact (21) are provided with pads (22) connected to the magnetic conductive plate (26). The moving iron end comprises a cylindrical moving iron (28). A reaction spring (27) is inserted into an exposed gap between the push rod (24) connecting the moving contact end and the moving iron end. A contact spring (25) is inserted between the push rod (24) connecting the support member (20) and the magnetic conductive plate (26).

5. A column-type ceramic sealed high-voltage DC contactor with auxiliary contacts according to claim 4, characterized in that: The bottom of the push rod (24) extends out from the bottom of the moving iron (28) and a retaining ring (29) is connected between the moving iron (28); the top of the push rod (24) extends out from the top of the moving contact (21) and a retaining ring (29) is also provided between the moving contact (21).

6. A column-type ceramic sealed high-voltage DC contactor with auxiliary contacts according to claim 5, characterized in that: The liner (22) is a rectangular cavity structure, and anti-misalignment angles (2201) are processed around the liner (22), and magnetic steel (23) is inserted into the cavity along the anti-misalignment angles (2201).

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