High-voltage direct current contactor

Abstract

The utility model discloses a high-voltage DC contactor, comprising a housing and an end cover, the end cover is arranged at the opening end of the housing and forms a cavity, a contact unit, an arc extinguishing unit and an electromagnetic unit are arranged in the cavity, the end cover is installed on the housing in a sealing manner through a fixing assembly, and the fixing assembly comprises a sealing cover and an annular limiting member. The end cover is attached to the shell through the annular limiting piece, the sealing cover is arranged on the end cover in a covering mode, and sealing is formed between the end cover and the shell through the epoxy resin filling and sealing technology. According to the utility model, through arranging the fixing assembly, the end cover can be rapidly installed on the housing in a horizontal state, and the fixing process of the end cover is simple and reliable; the end cover is firstly attached to the shell through the annular limiting piece, then the sealing cover is arranged on the end cover in a covering mode, sealing is formed between the end cover and the shell through the epoxy resin potting technology, the end cover and the sealing cover are kept in the horizontal state all the time in the process, the potting efficiency is improved, and meanwhile the flatness and the sealing performance of epoxy resin are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, in particular to an epoxy sealed gas-filled high-voltage direct current contactor. Background Art

[0002] High-voltage DC contactors are mainly divided into ceramic sealed gas-filled type, plastic packaged open type and epoxy sealed gas-filled type. Among them, the epoxy sealed gas-filled high-voltage DC contactor adopts a plastic shell arc extinguishing chamber, which is sealed through an epoxy resin potting process and filled with inert gas to extinguish the arc and protect the contacts.

[0003] The installation of the end cover and the housing of the existing high-voltage DC contactor is mostly achieved by interference fit between parts. However, this installation method cannot ensure that the end cover is installed in place. If it is installed in place, when the epoxy resin is potted and shaped, the upper end surface of the end cover may exceed the installation surface of the copper busbar installed at the static contact lead-out end, resulting in the product being unable to be installed normally; therefore, during potting, special attention needs to be paid to whether the upper end surface of the end cover is horizontal and the amount of epoxy resin used, resulting in a cumbersome potting process and low efficiency. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the utility model provides a high-voltage DC contactor, whose end cover is installed on the shell through a fixing assembly and then sealed through an epoxy resin potting process. The simple fixing structure can ensure that the end cover is installed in place and the horizontality of the front end cover of the potted epoxy resin can be ensured, and the potting efficiency is high.

[0005] The utility model adopts a technical solution to solve its technical problems: provide a high-voltage DC contactor, including a shell and an end cover, the end cover is arranged at the open end of the shell and forms a cavity, the cavity is provided with a contact unit, an arc extinguishing unit and an electromagnetic unit, the end cover is sealed and installed on the shell through a fixing component, the fixing component includes a sealing cover and an annular limiting piece, the end cover is attached to the shell through the annular limiting piece, the sealing cover is arranged on the end cover, and a seal is formed between the end cover and the shell through an epoxy resin potting process.

[0006] As a further improvement of the utility model, the annular limit member includes a horizontally arranged clamping portion and a fixing portion connected to the clamping portion; the clamping portion is arranged around the peripheral wall of the cover and pressed on the upper end surface of the end cover, and the fixing portion is covered on the outer peripheral wall of the outer shell close to the opening end.

[0007] As a further improvement of the utility model, the clamping portion is provided with a first annular groove on the upper end surface of the side facing the sealing cover, and the sealing cover is provided with an annular flange matched with the first annular groove; a gap is provided between the first annular groove and the peripheral wall relatively close to the annular flange.

[0008] As a further improvement of the utility model, the outer shell is provided with a second annular groove adapted to the fixing part on the outer circumferential wall near its open end, the outer circumferential wall of the second annular groove is provided with at least one arc-shaped groove, and the fixing part is provided with an arc-shaped boss which is matched with the arc-shaped groove.

[0009] As a further improvement of the utility model, the outer shell is provided with a third annular groove matched with the outer edge of the end cover on the inner peripheral wall near the opening end thereof.

[0010] As a further improvement of the utility model, the end cover is provided with a matching hole, an insulating isolation plate and an air injection hole, and there are two matching holes, and the two matching holes are for the two static contact lead-out ends of the contact unit to pass through, the insulating isolation plate is vertically arranged upward between the two static contact lead-out ends, and the air injection hole is coaxially arranged with the air inlet of the arc extinguishing unit.

[0011] As a further improvement of the present invention, the cover is provided with two through holes which are coaxially arranged with the two matching holes, and the two through holes are matched with the fixing pieces on the static contact lead-out end, and the outer peripheral wall of the fixing piece is provided with axial stripes;

[0012] The sealing cover is provided with a long slot hole between the two through holes for the insulating isolation plate to pass through.

[0013] As a further improvement of the utility model, an annular boss is provided on the upper end surface of the end cover located on the outer periphery of the gas injection hole; the sealing cover is provided with a cover at a position corresponding to the annular boss, and the cover is arranged on the annular boss.

[0014] As a further improvement of the utility model, the shell has a side wall facing the auxiliary contact lead-out end of the contact unit with a notch for the wire to pass through, a wire groove is provided on the horizontal end surface of the notch, and the end cover is provided with a protrusion that cooperates with the notch.

[0015] The beneficial effects of the utility model are:

[0016] 1. By setting the fixing assembly, the end cover can be quickly installed on the housing in a horizontal state, and the fixing process of the end cover is simple and reliable;

[0017] 2. The end cap is first attached to the outer shell through an annular limiter, and then the sealing cover is placed on the end cap, and a seal is formed between the end cap and the outer shell through an epoxy resin potting process. During the process, the end cap and the sealing cover always remain in a horizontal state, which not only improves the potting efficiency, but also ensures the flatness and sealing of the epoxy resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the exploded structure of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the fixing assembly of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the utility model without a wire;

[0021] Figure 4 It is a schematic diagram of the cross-sectional structure of the utility model.

[0022] Combined with the accompanying drawings, the following description is given:

[0023] 1. Shell; 11. Second annular groove; 111. Arc-shaped groove; 12. Third annular groove; 13. Notch; 131. Wire groove; 2. End cover; 21. Outer edge; 22. Matching hole; 23. Insulating isolation plate; 24. Gas injection hole; 241. Annular boss; 25. Bump; 3. Contact unit; 31. Static contact lead-out terminal; 311. Fixing member; 32. Auxiliary contact lead-out terminal; 321. Wire; 4. Arc extinguishing unit; 41. Air inlet; 5. Fixing assembly; 51. Cover; 511. Annular flange; 512. Through hole; 513. Long slot hole; 514. Cover; 52. Annular limiter; 521. Pressing portion; 5211. First annular groove; 522. Fixing portion; 5221. Arc-shaped boss; 53. Gap. DETAILED DESCRIPTION

[0024] A preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings.

[0025] See also Figures 1 to 4 The utility model provides a high-voltage DC contactor, including a housing 1 and an end cover 2. The end cover 2 is arranged at the open end of the housing 1 and forms a cavity, in which a contact unit 3, an arc extinguishing unit 4 and an electromagnetic unit are arranged. Among them, the contact unit 3 includes two static contact lead-out terminals 31, and the two static contact lead-out terminals 31 are respectively provided with fixing parts 311; the arc extinguishing unit 4 is provided with an air inlet 41, which is used to flush inert gas into the chamber of the arc extinguishing unit; the electromagnetic unit includes a coil, a driving rod and other structures that are the same as the prior art. The above contact unit 3, arc extinguishing unit 4 and electromagnetic unit are all prior art and will not be repeated in this application. The high-voltage DC contactor provided by the utility model mainly relates to the fixing structure of the end cover of the epoxy sealed inflatable high-voltage DC contactor, and provides a fixing component 5 of the end cover 2 to ensure that the end cover can be installed in place to facilitate the encapsulation of epoxy resin, thereby ensuring the sealing of the cavity.

[0026] Specifically, the end cap 2 is sealed and installed on the housing 1 through the fixing assembly 5. The fixing assembly 5 includes a sealing cover 51 and an annular stopper 52. The end cap 2 is attached to the housing 1 through the annular stopper 52. The sealing cover 51 is covered on the end cap 2, and a seal is formed between the end cap 2 and the housing 1 through an epoxy resin potting process. That is, the end cap 2 is first covered on the open end of the housing 1, and then the end cap 2 is positioned and fixed by the annular stopper 52, and then the sealing cover 51 is placed on the upper end surface of the end cap 2. Finally, the epoxy resin is used to cover the upper end surface of the sealing cover 51 and fill the gap 53 between the sealing cover 51 and the annular stopper 52 through the epoxy resin potting process, so that the end cap 2 is sealed and connected to the housing 1. Since the end cap 2 is supported by the end surface of the open end of the housing 1 and fixed by the annular stopper 52, it is ensured that the end cap 2 can be installed in place and maintain a horizontal state.

[0027] Furthermore, the side cross-section of the annular limit member 52 is in the shape of a "7", including a horizontally arranged clamping portion 521, and a vertically arranged fixing portion 522 connected to the clamping portion 521; the clamping portion 521 is arranged around the peripheral wall of the cover 51 and pressed on the upper end surface of the end cover 2, and the fixing portion 522 is wrapped on the outer peripheral wall of the outer shell 1 close to the open end, thereby ensuring that the end cover 2 is fixed to the outer shell 1 in a horizontal state.

[0028] The clamping portion 521 is provided with a first annular groove 5211 on the upper end surface of the side facing the cover 51, and the cover 51 is provided with an annular flange 511 matched with the first annular groove 5211. The cover 51 is supported and limited by the first annular groove 5211 of the clamping portion 521, so as to ensure the horizontal state of the cover 51; a gap 53 is provided between the first annular groove 5211 and the peripheral wall relatively close to the annular flange 511, and the gap 53 is used to accommodate epoxy resin, so as to ensure the sealing between the cover 51 and the annular limiting member 52, and further ensure the effective fixation and sealing of the cover.

[0029] Furthermore, the outer peripheral wall of the housing 1 near its opening end is provided with a second annular groove 11 adapted to the fixing portion 522, the outer peripheral wall of the second annular groove 11 is provided with at least one arc-shaped groove 111, and the fixing portion 522 is provided with an arc-shaped boss 5221 matched with the arc-shaped groove 111. That is, the annular stopper 52 can be fixedly connected to the housing 1 through its fixing portion 522, or the arc-shaped boss 5221 is engaged with the arc-shaped groove 111, or a threaded connection is adopted, that is, the annular stopper and the housing can be connected to each other.

[0030] Furthermore, the housing 1 is provided with a third annular groove 12 on the inner peripheral wall near the open end thereof, which is matched with the outer edge 21 of the end cover 2. The depth of the third annular groove 12 is the same as the thickness of the outer edge 21 of the end cover 2, so that the end cover 2 can sink into the open end of the housing 1, so that the upper end surface of the end cover 2 and the end surface of the open end of the housing 1 are on the same horizontal plane, which is not only conducive to the positioning of the end cover 2, but also when the annular stopper 52 is fixing the end cover 2, the end cover will not move, ensuring that the end cover always remains in a horizontal state, which is convenient for the subsequent epoxy resin potting.

[0031] Furthermore, the end cover 2 is provided with a matching hole 22, an insulating isolation plate 23 and a gas injection hole 24. There are two matching holes 22, and the two matching holes 22 are for the two static contact lead-out terminals 31 to pass through. The insulating isolation plate 23 is vertically arranged between the two static contact lead-out terminals 31, and is used to electrically isolate the two static contact lead-out terminals 31; the gas injection hole 24 is coaxially arranged with the gas inlet 41 of the arc extinguishing unit 4. When in use, gas is injected into the chamber of the arc extinguishing unit 4 through the inflatable copper tube. Two through holes 512 are provided on the cover 51, and the two through holes 512 are adapted to the fixing piece 311 on the static contact lead-out terminal 31. The outer peripheral wall of the fixing piece 311 is provided with axial stripes, which are used to increase the contact area with the epoxy resin, increase the radial force, prevent the static contact lead-out terminal 31 from rotating due to external force, and improve the air tightness.

[0032] A long slot hole 513 for the insulating isolation plate 23 to pass through is provided between the two through holes 512 on the cover 51. The insulating isolation plate 23 on the end cover 2 passes through the long slot hole 513 on the cover 51 to limit the position of the cover 51, thereby ensuring that the cover position remains fixed during epoxy resin pouring, facilitating resin pouring and ensuring the airtightness of the product.

[0033] The upper end surface of the end cover 2 is located at the outer periphery of the gas injection hole 24 and is provided with an annular boss 241, which can effectively protect the root of the inflatable copper tube; the sealing cover 51 is provided with a cover 514 at a position corresponding to the annular boss 241, and the cover 514 is arranged on the annular boss 241 to protect the gas injection hole 24.

[0034] Furthermore, the housing 1 is provided with a notch 13 for the wire 321 to pass through on the side wall facing the auxiliary contact lead-out terminal 32 of the contact unit 3, a wire groove 131 is provided on the horizontal end surface of the notch 13, and the end cover 2 is provided with a protrusion 25 that is matched and connected with the notch 13. The wire is passed through the axis of the auxiliary contact lead-out terminal 32 vertically to ensure the flatness of the cover, thereby improving the flatness of the epoxy resin potting.

[0035] In summary, the high-voltage DC contactor provided by the utility model, by setting a fixing component, allows the end cover to be quickly and horizontally installed on the shell, and the fixing process of the end cover is simple and reliable; the end cover is first attached to the shell through an annular limit piece, and then the sealing cover is set on the end cover, and a seal is formed between the end cover and the shell through an epoxy resin potting process. During the process, the end cover and the sealing cover always remain in a horizontal state, which not only improves the potting efficiency, but also ensures the flatness and sealing of the epoxy resin.

[0036] In the above description, many specific details are described to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A high-voltage direct current contactor, comprising a housing (1) and an end cover (2), wherein the end cover (2) is arranged at an open end of the housing (1) and forms a cavity, wherein a contact unit (3), an arc extinguishing unit (4) and an electromagnetic unit are arranged in the cavity, characterized in that: The end cover (2) is sealed and mounted on the outer shell (1) via a fixing assembly (5); the fixing assembly (5) comprises a sealing cover (51) and an annular stopper (52); the end cover (2) is attached to the outer shell (1) via the annular stopper (52); the sealing cover (51) is covered on the end cover (2), and a seal is formed between the end cover (2) and the outer shell (1) by an epoxy resin potting process.

2. The high voltage DC contactor according to claim 1, characterized in that: The annular limiting member (52) comprises a horizontally arranged clamping portion (521) and a fixing portion (522) connected to the clamping portion (521); the clamping portion (521) is arranged around the peripheral wall of the sealing cover (51) and pressed onto the upper end surface of the end cover (2), and the fixing portion (522) is wrapped around the outer peripheral wall of the outer shell (1) close to the open end.

3. The high voltage DC contactor according to claim 2, characterized in that: The clamping portion (521) is provided with a first annular groove (5211) on the upper end surface of the side facing the sealing cover (51), and the sealing cover (51) is provided with an annular flange (511) adapted to the first annular groove (5211); a gap (53) is provided between the circumferential wall relatively close to the first annular groove (5211) and the annular flange (511).

4. The high voltage DC contactor according to claim 3, characterized in that: The outer shell (1) is provided with a second annular groove (11) adapted to the fixing portion (522) on the outer peripheral wall near the opening end thereof, at least one arc-shaped groove (111) is provided on the outer peripheral wall of the second annular groove (11), and the fixing portion (522) is provided with an arc-shaped boss (5221) matched with the arc-shaped groove (111).

5. The high voltage DC contactor according to claim 4, characterized in that: The outer shell (1) is provided with a third annular groove (12) on the inner peripheral wall near the opening end thereof, the third annular groove (12) being matched with the outer edge (21) of the end cover (2).

6. The high voltage DC contactor according to claim 1, characterized in that: The end cover (2) is provided with a matching hole (22), an insulating isolation plate (23) and an air injection hole (24); there are two matching holes (22), and the two matching holes (22) are for two static contact lead ends (31) of the contact unit (3) to pass through; the insulating isolation plate (23) is vertically arranged between the two static contact lead ends (31); and the air injection hole (24) is coaxially arranged with the air inlet (41) of the arc extinguishing unit (4).

7. The high voltage DC contactor according to claim 6, characterized in that: The cover (51) is provided with two through holes (512) which are coaxially arranged with the two matching holes (22), and the two through holes (512) are matched with the fixing piece (311) on the static contact lead-out terminal (31), and the outer peripheral wall of the fixing piece (311) is provided with axial stripes; The sealing cover (51) is provided with a long slot hole (513) between the two through holes (512) for the insulating isolation plate (23) to pass through.

8. The high voltage DC contactor according to claim 7, characterized in that: An annular boss (241) is provided on the upper end surface of the end cover (2) at the outer periphery of the gas injection hole (24); the sealing cover (51) is provided with a cover (514) at a position corresponding to the annular boss (241), and the cover (514) is covered on the annular boss (241).

9. The high voltage DC contactor according to claim 1, characterized in that: The housing (1) is provided with a notch (13) for a wire (321) to pass through on a side wall facing the auxiliary contact lead-out end (32) of the contact unit (3); a wire groove (131) is provided on a horizontal end surface of the notch (13); and a protrusion (25) is provided on the end cover (2) to cooperate with the notch (13).

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