CN112350152A

CN112350152A - Contact box

Info

Publication number: CN112350152A
Application number: CN202011297352.XA
Authority: CN
Inventors: 张云根; 郑君; 熊小利
Original assignee: Zhejiang Roxz Electric Co ltd
Current assignee: Zhejiang Roxz Electric Co ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-02-09

Abstract

The invention provides a contact box, and belongs to the technical field of electrical insulation. The contact box solves the problem that the service life of the existing contact box is short. This contact box is including being tube-shape and lower extreme open-ended body and inlaying in this internal and shape and body inner chamber complex high-pressure shielding net, body lateral part integrated into one piece has bulge and bulge to be equipped with the outlet that is linked together with the body inner chamber, high-pressure shielding net lateral part runs through to be provided with outlet matched with mouth of stepping down, high-pressure shielding net lateral part has linked firmly the extension housing in the department of stepping down, the extension housing inlays in the bulge, the extension housing is loudspeaker form and extends the housing and follow the direction that the outlet extended into this internal chamber and dwindle gradually. The insulating structure has the advantages of good insulating effect, long service life and the like.

Description

Contact box

Technical Field

The invention belongs to the technical field of electrical insulation, and relates to a contact box.

Background

The high-voltage switch cabinet generally comprises a switch cabinet body, and a contact box, a bent partition plate, a sleeve and other components which are arranged in the switch cabinet body, wherein the contact box mainly plays a role in insulating a connecting part of an incoming line and an outgoing line so as to ensure the safe operation of the high-voltage switch cabinet. At present traditional contact box includes the box body that insulating material made, has seted up outlet and inlet wire respectively on the lateral wall on box body upper portion and bottom, and the top in the box body is connected with an inserts for fixed static contact that stretches into the box body from the outlet, when using this contact box respectively with female arranging and moving contact stretch into the box body from outlet and inlet wire on the box body in and contact can. In the use process, the air exists in the box body, dust exists on the surface of each conductive part, burrs exist due to machining problems, and the like, so that the partial discharge phenomenon is easily caused.

In order to reduce the amount of partial discharge inside the contact box, chinese patent has disclosed a contact box of a novel 40.5KV high-voltage switch cabinet with application number 201120477835.8, which is characterized in that a high-voltage shielding net is embedded in the contact box body, the high-voltage shielding net is connected with an insert inside the contact box body, and the connecting position of each conductive component is covered by the high-voltage shielding net, thereby eliminating the discharge phenomenon occurring inside the contact box body. However, in practical application, after the busbar is installed at the outlet, the air gap between the inner wall of the outlet and the busbar is very small, so that the discharging phenomenon can be caused at the position when the contact box works, and the high-voltage shielding net can only eliminate the point discharging phenomenon inside the contact box body, so that the service life of the contact box is influenced. Similar problems as described above also exist with other contact boxes having shielding functionality.

Aiming at the phenomenon, a mode which is easily thought by a person skilled in the art is 1, the processing precision of the surface of the busbar is improved, and burrs and the like are avoided; 2. enlarging the wire outlet to enlarge the air gap between the busbar and the inner wall of the wire outlet; 3. the body is made of a better insulating material.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a contact box which solves the problem of short service life.

The purpose of the invention can be realized by the following technical scheme:

contact box, including being tube-shape and lower extreme open-ended body and inlaying in this internal and shape and body inner chamber complex high-pressure shielding net, body lateral part integrated into one piece have bulge and bulge to be equipped with the outlet that is linked together with the body inner chamber, high-pressure shielding net lateral part run through be provided with the outlet matched with mouth of stepping down, its characterized in that, high-pressure shielding net lateral part in stepping down a mouthful department link firmly extend the shield cover, extend the shield cover and inlay in the bulge, extend the shield cover and be the loudspeaker form and extend the shield cover and extend the direction that goes into this inner chamber along the outlet and reduce gradually.

During installation, the contact box is fixed in the cabinet body of the switch cabinet, the busbar extends into the inner cavity of the body from the wire outlet to be fixed, and other conductive parts extend into the contact box from the opening at the lower end of the body and are matched with the busbar. Because the shape of the high-voltage shielding net is matched with the inner cavity of the body, the busbar is positioned at the inner side of the high-voltage shielding net at the fixed position of the inner cavity of the body, so that the discharging phenomenon of the inner cavity of the body can be eliminated by utilizing the high-voltage shielding net when the contact box works, and the local discharging amount is reduced, so that the internal electric field is more uniform. In addition, the high-voltage shielding net is provided with a convex extending shielding cover at the yielding port, the extending shielding cover is embedded in the convex part, and the extending shielding cover can eliminate the discharge phenomenon caused by small air gap between the busbar and the inner wall of the convex part. And because the extension shield cover is trumpet-shaped and the extension shield cover is gradually reduced along the direction that the wire outlet extends into the inner cavity of the body, the distance between the end part of the extension shield cover and the inner wall of the bulge part can be increased as much as possible, the insulation thickness is increased, discharge caused by burrs at the end part of the extension shield cover is avoided, the inner wall of the bulge part is prevented from being punctured, and the insulation performance is ensured. Through the arrangement, the contact box has the advantages that the shielding effect is well improved, the insulating property is ensured, and the service life of the contact box is prolonged.

In the above contact box, the outlet is a square outlet, and the extension shielding cover is square.

The outlet is square, and it is square to extend the shield cover, and its formation can cooperate better with female shape of arranging, and female arranging of outlet department can be covered by extending the shield cover as far as possible like this for the shielding effect of here is better, and then guarantees insulating properties in order to prolong the life of contact box.

In the above-mentioned contact box, the extending shielding cover includes a pair of first shielding plates and a pair of second shielding plates, the first shielding plates are all obliquely arranged, and the distance between the first shielding plates is gradually reduced along the direction in which the outlet extends into the inner cavity of the body, and the second shielding plates are all obliquely arranged, and the distance between the second shielding plates is gradually reduced along the direction in which the outlet extends into the inner cavity of the body.

The direction that this internal chamber was extended into along the outlet to the distance between two shielding piece one all inclines to set up and two shielding piece one reduces gradually, and the direction that this internal chamber was extended into along the outlet to the distance between two shielding piece two all inclines to set up and two shielding piece two reduces gradually, just so can make whole extension shield cover be loudspeaker form so that insulating layer thickness increases gradually along the direction that body inner chamber stretches out the outlet to avoid extending the most advanced discharge that shield cover tip department probably produced and to break down the bulge inner wall and influence insulating properties.

In the contact box, each first shielding plate and the two adjacent second shielding plates are in arc transition.

Each shielding sheet I and the two adjacent shielding sheets II are in arc transition, so that the phenomenon of discharge caused by sharp corners at the joints can be avoided, and the service life of the contact box is further prolonged.

In the contact box, the high-voltage shielding net is formed by conducting nylon in an injection molding mode, and the extension shielding cover and the high-voltage shielding net are of an integrated structure.

Through the design of the mould, the high-voltage shielding net with the extension shielding cover can be directly formed by injection molding of conductive nylon. The contact box and the contact box are of an integrated structure, so that the integrity is better, the point discharge phenomenon is less prone to generating, the service life of the contact box is guaranteed, the production cost is lower, and the quality is lighter.

The high-voltage shielding net with the extension shielding cover cannot be directly manufactured by adopting metal, and can only be welded into a whole after being respectively processed and manufactured, and the probability of point discharge is easily increased at the welding position.

In the above contact box, the edge of the end of the extension shield has a thickened portion protruding outward, the surface of the thickened portion is an arc surface, and the thickened portion and the inner surface and the outer surface of the end of the extension shield are in arc transition.

The thickening part surface is the arc surface, and all is the circular arc transition between thickening part and the internal surface and the surface that extend the shield cover tip, so make and extend shield cover tip department and do not have sharp-pointed position, further eliminated the discharge phenomenon.

In the contact box, the upper part of the inner cavity of the body is a working section, and the length of the high-voltage shielding net is the same as that of the working section, or the length of the high-voltage shielding net is greater than that of the working section.

The upper portion of the inner cavity of the body is a working section, the conductive matching of each part is located in the working section, the length of the high-voltage shielding net is the same as that of the working section or is larger than that of the working section, so that the high-voltage shielding net completely covers the electric connection part of each part to realize full shielding, and the service life of the contact box is prevented from being influenced by partial discharge in the inner cavity of the body.

In the above-mentioned contact box, the body outside be equipped with square boss, square boss is located the below of bulge, the metal insert that is equipped with a plurality of in-band screw holes is inlayed to square boss lower surface, the position department that corresponds square boss in the body has inlayed the ground connection shield ring, high pressure shielding net lower extreme is located the ground connection shield ring inboard, ground connection shield ring outer peripheral face an organic whole has linked firmly the metal connection piece of a plurality of bars, each metal insert one links firmly in the tip that corresponds the metal connection piece.

Through the arrangement of the grounding shielding ring, the discharging phenomenon at the connecting position of the body and the switch cabinet mounting plate can be shielded and eliminated, and the service life of the contact box is further prolonged.

In the contact box, the body is integrally formed outside the high-voltage shielding net and the grounding shielding ring in an epoxy resin pouring mode.

In the contact box, the side part of the upper end of the body is also integrally formed with a supporting part, the supporting part and the protruding part are arranged back to back, and the side surface of the supporting part, which is far away from the body, is embedded with at least one metal insert II with an internal threaded hole.

During the use, fix the contact box in the cabinet of cubical switchboard is internal, and the contact box is fixed with the cabinet body of cubical switchboard total two fixed positions, and one is realized fixedly through the cooperation of fastener and metal insert one, and another department realizes fixedly through the cooperation of fastener and metal insert two, and two fixed positions make the contact box more firm with being connected between the cubical switchboard cabinet body, the unsettled condition in upper end can not appear, make its focus more steady, and the stress point is more dispersed.

Compared with the prior art, the contact box has the following advantages:

1. the shape of the high-voltage shielding net is matched with the inner cavity of the body, so that the discharge phenomenon in the body can be eliminated, and the local discharge amount is reduced, so that the internal electric field is more uniform;

2. a convex extension shielding cover is arranged at the abdication port on the high-voltage shielding net and embedded in the convex part, and the extension shielding cover can eliminate the discharge phenomenon caused by small air gap between the busbar and the inner wall of the convex part;

3. the extension shield is horn-shaped, and the extension shield cover is gradually reduced along the direction of the wire outlet extending into the inner cavity of the body, so that the distance between the end part of the extension shield cover and the inner wall of the bulge part can be increased as much as possible, the insulation thickness is increased, discharge caused by burrs at the end part of the extension shield cover is avoided, the inner wall of the bulge part is prevented from being punctured, and the insulation performance is ensured;

4. the service life is prolonged by eliminating the discharge phenomenon, increasing the insulation thickness and the like.

Drawings

Figure 1 is a schematic view of a first embodiment of the present contact box.

Figure 2 is another perspective view of the present contact box embodiment one.

Figure 3 is a vertical cross-sectional view of the first embodiment of the present contact box.

Figure 4 is a transverse cross-sectional view of the first embodiment of the present contact box.

Figure 5 is a schematic view of the present contact box at the location of the high voltage shielding mesh.

Figure 6 is a schematic view of the present contact box at the ground shield ring.

Figure 7 is a transverse cross-sectional view of a second embodiment of the present contact box.

Figure 8 is a transverse cross-sectional view of a third embodiment of the present contact box.

In the figure, 1, a body; 1a, a projection; 1a1, outlet; 1b, a square boss; 1c, a concave cavity; 1d, a support part; 1e, climbing an umbrella skirt; 1f, a protective part; 2. a high voltage shielding mesh; 2a, yielding ports; 3. an extension shield; 3a, a first shielding sheet; 3b, a second shielding sheet; 3c, a thickened portion; 4. a metal mounting block; 4a, mounting holes; 5. fastening screws; 6. a protective part; 7. a coupling hole; 8. a first metal insert; 9. a ground shield ring; 10. a metal connecting sheet; 11. and a second metal insert.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1-4, the contact box includes a cylindrical body 1 with an opening at the lower end, and a high-voltage shielding net 2 embedded in the wall of the body 1 and having a shape matching with the inner cavity of the body 1. The top wall of the inner cavity of the body 1 is fixed with a metal mounting block 4, the lower surface of the metal mounting block 4 is provided with a mounting hole 4a with internal threads, the upper end face of the metal mounting block 4 is provided with a connector embedded in the top wall of the body 1, the connector penetrates through the top of the high-voltage shielding net 2, and the metal mounting block 4 and the high-voltage shielding net 2 are fixed through a fastening screw 5 which penetrates through the top wall of the high-voltage shielding net 2 downwards and penetrates into the metal mounting block 4. The side of the body 1 is integrally formed with a protrusion 1a, and the protrusion 1a is provided with a wire outlet 1a1 communicated with the inner cavity of the body 1, in this embodiment, the opening direction of the wire outlet 1a1 is perpendicular to the axis of the body 1, and the side of the upper end of the high-voltage shielding net 2 is provided with a yielding port 2a corresponding to the wire outlet 1a1 in a penetrating manner. The side of the body 1 is further integrally formed with a protection part 1f, the protection part 1f and the protruding part 1a are arranged along the same direction, the protruding part 1a is located on the inner side of the protection part 1f, the protection part 1f extends out of the protruding part 1a, and a gap is formed between the protruding part 1a and the protection part 1 f. The upper part of the inner cavity of the body 1 is a working section, and the length of the high-voltage shielding net 2 is the same as that of the working section, or the length of the high-voltage shielding net 2 is larger than that of the working section.

As shown in fig. 3, 4 and 5, the high voltage shielding net 2 is specifically a cylinder with an open lower end, the side of the high voltage shielding net 2 is fixedly connected with an extension shielding cover 3 at a yielding port 2a, the extension shielding cover 3 is embedded in the protruding portion 1a, the outlet 1a1 is a square port, the extension shielding cover 3 is square, the extension shielding cover 3 is horn-shaped, and the extension shielding cover 3 is gradually reduced along the direction that the outlet 1a1 extends into the inner cavity of the body 1. The extension shielding cover 3 and the high-voltage shielding net 2 are of an integrated structure, and the high-voltage shielding net 2 and the extension shielding cover 3 are provided with coupling holes 7 in a penetrating mode. Wherein, the cross-section of extending shield cover 3 along vertical direction is squarely, it includes a pair of shielding piece 3a and a pair of shielding piece two 3b to extend shield cover 3, two shielding piece one 3a and two shielding piece two 3b all link firmly with high-pressure shielding net 2, two shielding piece one 3a all slope set up and the distance between two shielding piece one 3a reduces along the direction that outlet 1a1 stretched into the body 1 inner chamber gradually, two shielding piece two 3b all slope set up and the distance between two shielding piece two 3b reduces along the direction that outlet 1a1 stretched into the body 1 inner chamber gradually, be circular arc transition between shielding piece one 3a and the adjacent shielding piece two 3 b. Furthermore, the edge of the end of the extension shield 3 has a thickened portion 3c protruding outward, the surface of the thickened portion 3c is an arc surface, and the thickened portion 3c and the inner surface and the outer surface of the end of the extension shield 3 are in arc transition. The surface of the thickened part 3c is an arc surface, and the thickened part 3c and the inner surface and the outer surface of the end part of the extension shielding case 3 are in arc transition, so that the end part of the extension shielding case 3 has no sharp part, and the discharge phenomenon is further eliminated.

As shown in fig. 1, 2 and 6, a square boss 1b is arranged on the outer side of the body 1, the square boss 1b and the body 1 are of an integral structure, and the square boss 1b is located below the protruding portion 1 a. The lower surface of the square boss 1b is embedded with a plurality of metal inserts 8 with internal threads at positions close to four corners, a grounding shielding ring 9 is embedded in the body 1 corresponding to the square boss 1b, and the lower end of the high-voltage shielding net 2 is positioned on the inner side of the grounding shielding ring 9. The outer peripheral surface of the grounding shielding ring 9 is integrally and fixedly connected with four strip-shaped metal connecting sheets 10, and the top of each metal insert I8 is fixedly connected with the lower side of the end part of the corresponding metal connecting sheet 10 (specifically, the metal inserts can be fixedly connected in a welding mode).

Further, as shown in fig. 1 and 2, creepage sheds 1e are arranged on the outer side of the lower end of the body 1 and the outer side of the position close to the upper end of the body 1, and the high-voltage shielding net 2 is positioned between the creepage sheds 1 e. The body 1 is provided with a concave cavity 1c at the top, and the bottom wall of the concave cavity 1c is provided with a convex hull. The lateral part of the upper end of the body 1 is further integrally formed with a supporting part 1d, the supporting part 1d is arranged opposite to the protruding part 1a, and a second metal insert 11 with at least one internal threaded hole is embedded on the side surface of the supporting part 1d far away from the body 1.

The high-voltage shielding net 2 and the grounding shielding ring 9 are made of conductive materials, the metal mounting block 4 and the high-voltage shielding net 2 are fixed together, the first metal insert 8 and the grounding shielding ring 9 are fixed together, then the first metal insert 8 and the second metal insert 11 are placed in a mold, liquid epoxy resin is poured into the mold, and after cooling, the body 1 with the high-voltage shielding net 2, the grounding shielding ring 9, the first metal insert 8 and the second metal insert 11 embedded inside can be formed. During the use, fix the contact box in the cabinet of cubical switchboard is internal, and the contact box is fixed with the cabinet body of cubical switchboard total two fixed positions, and one is realized fixedly through the cooperation of fastener and metal insert 8, and another is realized fixedly through the cooperation of fastener and two 11 of metal insert, and two fixed positions make the connection between contact box and the cubical switchboard cabinet body more firm, can not appear the unsettled condition in upper end, make its focus more steady, and the stress point is more dispersed.

The busbar extends into the inner cavity of the body 1 from the outlet 1a1 and is fixed with the metal mounting block 4 through a fastener, and meanwhile, other matching parts extend into the inner cavity of the body 1 from the opening at the lower end of the body 1 to form matching. The upper portion of the inner cavity of the body 1 is a working section, the conductive matching of each part is located in the working section, the length of the high-voltage shielding net 2 is the same as that of the working section or the length of the high-voltage shielding net 2 is larger than that of the working section, so that the high-voltage shielding net 2 completely covers the electric connection part of each part to realize full shielding, and partial discharge in the inner cavity of the body 1 is avoided. Meanwhile, the convex extending shield cover 3 is arranged at the abdicating port 2a on the high-voltage shield net 2, the extending shield cover 3 is embedded in the convex part 1a, and the extending shield cover 3 can eliminate the discharge phenomenon caused by small air gap between the busbar and the inner wall of the convex part 1 a.

Example two

The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: as shown in fig. 7, the outlet 1a1 in this embodiment is inclined to one side with respect to the axis of the body 1 in the horizontal direction.

EXAMPLE III

The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: as shown in fig. 8, the outlet 1a1 in this embodiment is inclined to the other side with respect to the axis of the body 1 in the horizontal direction.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. Contact box, including being tube-shape and lower extreme open-ended body (1) and inlaying in body (1) and shape and body (1) inner chamber complex high-pressure shielding net (2), body (1) lateral part integrated into one piece have bulge (1a) and bulge (1a) to be equipped with outlet (1a1) that are linked together with body (1) inner chamber, high-pressure shielding net (2) lateral part run through be provided with outlet (1a1) matched with abdication mouth (2a), its characterized in that, high-pressure shielding net (2) lateral part in abdication mouth (2a) department link firmly extension shield cover (3), extension shield cover (3) inlay in bulge (1a), extension shield cover (3) are the horn form and extend shield cover (3) and follow the direction that outlet (1a1) extend into body (1) inner chamber and reduce gradually.

2. The contact box according to claim 1, characterized in that said outlet (1a1) is a square outlet and the extension shield (3) is a square.

3. The contact box according to claim 2, wherein said extension shield (3) comprises a pair of first shield plates (3a) and a pair of second shield plates (3b), wherein said first shield plates (3a) are disposed obliquely and the distance between said first shield plates (3a) is gradually reduced along the direction that said outlet (1a1) extends into the cavity of said body (1), said second shield plates (3b) are disposed obliquely and the distance between said second shield plates (3b) is gradually reduced along the direction that said outlet (1a1) extends into the cavity of said body (1).

4. The contact box of claim 3, wherein each shield plate I (3a) is in circular arc transition with the adjacent two shield plates II (3 b).

5. The contact box according to claim 1 or 2 or 3 or 4, characterized in that the high voltage shielding net (2) is made of conductive nylon by injection molding, and the extension shielding cover (3) and the high voltage shielding net (2) are of an integral structure.

6. The contact box according to claim 5, characterized in that the edge of the end of the extension shield (3) has a thickened portion (3c) protruding outwards, the surface of the thickened portion (3c) is a circular arc surface, and the thickened portion (3c) and the inner surface and the outer surface of the end of the extension shield (3) are in circular arc transition.

7. The contact box according to claim 1, characterized in that the upper portion of the inner cavity of the body (1) is a working section, the length of the high-voltage shielding net (2) is the same as the length of the working section, or the length of the high-voltage shielding net (2) is greater than the length of the working section.

8. The contact box according to claim 7, wherein a square boss (1b) is arranged on the outer side of the body (1), the square boss (1b) is located below the protrusion (1a), a plurality of first metal inserts (8) with internal threaded holes are embedded on the lower surface of the square boss (1b), a grounding shield ring (9) is embedded in the body (1) at positions corresponding to the square boss (1b), the lower end of the high-voltage shield net (2) is located on the inner side of the grounding shield ring (9), a plurality of strip-shaped metal connecting pieces (10) are integrally fixedly connected on the outer peripheral surface of the grounding shield ring (9), and each first metal insert (8) is fixedly connected to the end of the corresponding metal connecting piece (10).

9. The contact box according to claim 8, wherein said body (1) is integrally formed outside said high voltage shielding mesh (2) and said ground shielding ring (9) by epoxy resin casting.

10. The contact box according to claim 1, characterized in that a support portion (1d) is further integrally formed on the upper end side of the body (1), the support portion (1d) is opposite to the protrusion portion (1a), and at least one metal insert two (11) with an internal threaded hole is embedded on the side surface of the support portion (1d) away from the body (1).