CN214204810U - Wall bushing - Google Patents

Abstract

The utility model discloses a wall bushing, which comprises a head component, a conductive rod and a connecting terminal covered with a sealing cover, wherein the connecting terminal is electrically connected with the conductive rod; the upper end part of the transition tank is provided with a first through hole, and the lower end part of the transition tank is communicated with the first through hole; the transition plate is provided with the second through hole, the conducting rod penetrates through the first through hole and the second through hole, the transition tank and the transition plate are fixedly connected, so that the transition tank is internally surrounded by the conducting rod to form a containing cavity, the wall bushing is simple in structure, the structure of the corrugated pipe is omitted, the axial dynamic sealing device can be avoided, the sealing reliability of a product is greatly improved, and meanwhile, the production cost can be reduced.

Description

Wall bushing

Technical Field

The application relates to the technical field of power transmission insulating equipment, in particular to a wall bushing.

Background

In the direct current transmission and transformation project, the wall bushing is used as the only electrical element for connecting the inside and the outside of the valve hall, bears the full voltage and the current of the whole line, and the performance reliability of the wall bushing is related to the operation safety and the stability of the whole line.

At present, the sheathed tube head subassembly of current wall of wearing is mostly the bellows, axial sealing connection is taken with the bellows to the conducting rod, the conducting rod passes the bellows and directly is connected with the external part electricity, specifically speaking, the one end and the sheathed tube end of wall of conducting rod are together fixed, the other end and the bellows of conducting rod are fixed and are stretched out the bellows outside and be connected with the external part electricity, thereby possess elastic bellows to provide the tensioning that the tensile force keeps the conducting rod to the conducting rod, when the conducting rod is heated and elongated, elastic deformation can take place for the bellows, make the conducting rod still keep straight state, stress bending can not take place, but there is following problem: when the head assembly of the wall bushing adopts the corrugated pipe, if axial sealing is adopted, the long-term reliability of the dynamic sealing cannot be ensured due to the friction effect of long-term expansion and contraction, and the product is easy to leak gas; if axial sealing is not adopted, an external transition tank needs to be additionally arranged, the wiring terminal and the conducting rod need to be in flexible connection, and the through-current capacity is limited; the corrugated pipe is high in price, so that the manufacturing cost of the product is increased; metal chips are easily generated between the conductive rod and the head assembly due to friction, resulting in internal discharge.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a not enough to prior art, the utility model aims at providing a wall bushing, this wall bushing simple structure has saved the structure of bellows, can avoid adopting axial dynamic seal device, has improved product seal reliability greatly, can reduction in production cost simultaneously.

In order to realize the purpose of the utility model, the utility model adopts the following technical means: a wall bushing comprises a head assembly, a conductive rod and a wiring terminal, wherein the wiring terminal is hermetically covered on the head assembly and the conductive rod and is electrically connected with the conductive rod; the upper end part of the transition tank is provided with a first through hole, and the lower end part of the transition tank is communicated with the first through hole; the transition plate is provided with a second through hole, the conducting rod penetrates through the first through hole and the second through hole, and the transition tank and the transition plate are fixedly connected to enable the transition tank to surround the conducting rod to form an accommodating cavity. The wall bushing is simple in structure, the structure of the corrugated pipe is omitted due to the arrangement of the transition tank, an axial dynamic sealing device can be avoided, the sealing reliability of a product is greatly improved, and meanwhile, the production cost can be reduced.

Preferably, a plurality of annular grooves are formed in the transition tank and surround the side wall of the conducting rod. The annular groove serves as a particle capture trap to adsorb metal particles in the transition tank, and the stable electrical performance of the head of the wall bushing is ensured.

Preferably, the lower end of the transition tank extends out of a first connecting part along the periphery of the transition tank, and the first connecting part is connected with the transition plate in a sealing mode. The setting of first connecting portion is convenient for carry out fixed connection with the transition jar with crossing the cab apron, and sealing connection can guarantee not invaded by the moisture in the transition jar, avoids influencing electrical properties.

Preferably, the inner wall of the first through hole and/or the inner wall of the second through hole is provided with a non-metallic lining. Avoid the conducting rod and cross the friction between cab apron, transition jar and produce the metal fillings, improve product operational reliability.

Preferably, the non-metallic liner is a polytetrafluoroethylene liner. The polytetrafluoroethylene lining has good insulation and wear resistance, and guarantees that the nonmetal lining is not worn and is continuously effective in the running process of the wall bushing to the maximum extent.

Preferably, the wiring terminal includes wiring portion, holding portion and second connecting portion in proper order, and the holding portion is used for holding the tip of conducting rod and is connected with the conducting rod electricity, and the upper end sealing connection of second connecting portion and transition jar. The wiring terminal is an electric connection component of the wall bushing and is used for being electrically connected with other equipment. The setting of second connecting portion is convenient for carry out fixed connection with binding post and transition jar.

Preferably, the end of the conducting rod is provided with a spring contact finger, the spring contact finger abuts against the inner wall of the accommodating part, and a gap exists between the accommodating part and the end of the conducting rod along the axial direction of the conducting rod. The spring contact fingers are simultaneously in close contact with the end parts of the wiring terminal and the conducting rod, so that stable electric connection is formed between the end parts of the wiring terminal and the conducting rod, the equipotential of the head assembly can be kept, and the problem of head heating is solved. There is the clearance along the axial of conducting rod between the tip of holding portion and conducting rod, can absorb the deformation of conducting rod expend with heat and contract with cold, avoids the conducting rod to produce the bending because of fixed connection.

Preferably, the part of the conducting rod, which is positioned at and above the transition tank, is of a solid structure, and the part of the conducting rod, which is positioned below the transition tank, is of a hollow structure. The conducting rod part with the solid structure can have good conductivity, and the conducting rod part with the hollow structure can reduce the weight of the conducting rod, so that the overall weight of the wall bushing is reduced, and the cost can be reduced.

Preferably, the lower surface of the transition plate is provided with a convex ring around the second through hole. The arrangement of the convex ring increases the supporting area of the conducting rod, and the bending resistance of the conducting rod can be improved.

Preferably, the wall bushing further comprises a hollow insulator, a flange of the hollow insulator is hermetically connected with the lower surface of the transition plate, and the conductive rod penetrates through the hollow insulator. The hollow insulator provides insulation protection for the inner conductor of the wall bushing.

Drawings

Fig. 1 is a partial cross-sectional view of a wall bushing 100 according to a first embodiment of the present invention;

fig. 2 is a partial cross-sectional view of a wall bushing 200 according to a second embodiment of the present invention;

fig. 3 is a partial cross-sectional view of a third embodiment of a wall bushing 300 according to the present invention;

fig. 4 is a partial cross-sectional view of a wall bushing 400 according to a fourth embodiment of the present invention;

fig. 5 is a cross-sectional view of a terminal 440 according to a fourth embodiment of the present invention;

fig. 6 is a partial cross-sectional view of a wall bushing 500 according to a fifth embodiment of the present invention;

fig. 7 is an overall schematic view of a wall bushing 500 according to a fifth embodiment of the present invention.

Detailed Description

As required, detailed embodiments of the present invention will be disclosed herein. However, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed manner, including employing various features disclosed herein in connection with which such features may not be explicitly disclosed.

The first embodiment is as follows:

as shown in fig. 1, the present embodiment provides a wall bushing 100, which includes a head assembly 110, a conductive rod 120, and a terminal 140 (only schematically illustrated) hermetically covering the head assembly 110 and the conductive rod 120, wherein the terminal 140 is electrically connected to the conductive rod 120, and the head assembly 110 includes a transition tank 111 and a transition plate 112 connected to each other; the upper end of the transition tank 111 is provided with a first through hole 1111, and the lower end of the transition tank 111 is communicated with the first through hole 1111; the transition plate 112 is provided with a second through hole 1121, the conductive rod 120 passes through the first through hole 1111 and the second through hole 1121, and the transition tank 111 and the transition plate 112 are fixedly connected such that a receiving cavity 113 is formed in the transition tank 111 around the conductive rod 120. This wall bushing 100 simple structure, the core part is transition jar 111 and transition board 112, and the structure of bellows has been saved in transition jar 111's setting, as long as can guarantee that transition jar 111 seals up the setting, applys sealed measure in transition jar 111's outside promptly, can avoid adopting axial to move sealing device between transition jar 111 and the conducting rod 120, has improved product seal reliability greatly, can reduce manufacturing cost simultaneously. It should be noted that the sealing cover is provided with the head assembly 110 and the connecting terminal 140 of the conductive rod 120, and the electrical connection between the head assembly 110 and the conductive rod 120 can be achieved by direct contact or internal conductor connection, and the shape and structure of the connecting terminal 140 are not particularly limited.

In the present embodiment, the transition plate 112 is a flat plate. In other embodiments, the shape of the transition plate is not particularly limited.

In this embodiment, the transition tank 111 is a cylindrical tank, the upper end portion is provided with a first through hole 1111, the lower end portion penetrates through the transition tank to form a cylindrical cavity, and the first through hole 1111 communicates with the cylindrical cavity. The transition tank 111 is fixedly connected to the transition plate 112, and after the conductive rod 120 is inserted into the first through hole 1111 and the second through hole 1121, the annular cavity surrounding the conductive rod 120 forms an accommodating cavity 113.

In other embodiments, the transition tank may be non-cylindrical in shape, so long as it is adaptable to the connected components.

In this embodiment, a plurality of annular grooves 1112 are disposed around the sidewall of the conductor bar 120 within the transition tank 111. The annular groove 1112 serves as a particle trap to adsorb metal particles in the transition tank 111, and ensures stable electrical performance of the head of the wall bushing 100.

In the present embodiment, the number of the annular grooves 1112 is four. In other embodiments, the number of the annular grooves is not limited, and the specific number is reasonably designed according to the size of the inner wall of the transition tank. However, it is understood that the larger the number of the annular grooves, the denser the number of the annular grooves, the better the effect of adsorbing the metal particles.

In this embodiment, the annular groove 1112 is a rectangular groove, and in other embodiments, the annular groove may also be an arc groove or an irregular groove, and the shape is not limited specifically herein.

In this embodiment, the lower end portion of the transition tank 111 extends out of a first connection portion 1114 along the periphery of the transition tank 111, and the first connection portion 1114 is connected with the transition plate 112 in a sealing manner. The arrangement of the first connecting portion 1114 is convenient for fixedly connecting the transition tank 111 and the transition plate 112, and the sealing connection can ensure that the interior of the transition tank 111 is not invaded by moisture, so as to avoid influencing the electrical performance.

In the present embodiment, a first seal groove 1122 is provided in the transition plate 112, and a seal ring (not shown) is provided in the first seal groove. In other embodiments, the first sealing groove may also be disposed on the first connecting portion, or both the first connecting portion and the transition plate are provided with sealing grooves, and the sealing ring is installed.

In this embodiment, the first connecting portion 1114 and the transition plate 112 are provided with corresponding through holes, and are fixedly connected by means of bolts (not shown). In other embodiments, the connection manner of the first connection portion and the transition plate may be glue, welding or a combination of the above fixing connection manners.

In the present embodiment, the portion of the conductive rod 120 located at and above the transition tank 111 is a solid structure, and the portion of the conductive rod 120 located below the transition tank 111 is a hollow structure. The solid conductive rod 120 portion can have good conductivity, and the hollow conductive rod 120 portion can reduce the weight of the conductive rod, thereby reducing the overall weight of the wall bushing 100 and reducing the cost.

In other embodiments, the conducting rod may be a full solid structure or a full hollow structure, the conducting rod is located at the transition tank and above, and the hollow conducting rod may have a larger wall thickness.

The wall bushing 100 of this embodiment is simple in structure, the core components are the transition tank 111 and the transition plate 112, the bellows structure is omitted in the arrangement of the transition tank 111, the sealing arrangement of the transition tank 111 can be ensured, namely, a sealing measure is applied to the outside of the transition tank 111, an axial dynamic sealing device between the transition tank 111 and the conducting rod 120 can be avoided, the sealing reliability of the product is greatly improved, and meanwhile, the production cost can be reduced.

Example two:

as shown in fig. 2, the present embodiment provides a wall bushing 200, which is different from the first embodiment in that the transition plate 212 has a different structure.

In this embodiment, the lower surface 2122 of the transition plate 212 is provided with a raised ring 2123 surrounding the second through hole 2121. The convex ring 2123 increases the supporting area of the conductive rod 220, and can improve the bending resistance of the conductive rod 220.

In other embodiments, the protruding ring may also be disposed on the upper surface of the transition plate, or both the upper surface and the lower surface are disposed with the protruding ring, which is essential to enlarge the contact area between the conducting rod and the transition plate and improve the bending resistance of the conducting rod.

The wall bushing 200 of this embodiment has the protruding ring 2123, so that the bending resistance of the conductive rod 220 can be improved, and the reliability of the whole product can be further improved.

Example three:

as shown in fig. 3, the present embodiment provides a wall bushing 300, which is different from the second embodiment in that a non-metal lining 330 is added.

In this embodiment, the inner walls of the first through hole 3111 and the second through hole 3121 are provided with the non-metal lining 330, so as to avoid the generation of metal particles due to friction between the conductive rod 330 and the transition plate 312 and the transition tank 311, thereby improving the operational reliability of the product.

In other embodiments, the non-metal lining may be disposed only on the inner wall of the first through hole or only inside the second through hole.

In this embodiment, the inner wall of the convex ring 3123 is also provided with a non-metallic inner lining 330. In other embodiments, the non-metal liner may be continuously disposed in a contact region between the conductive rod and another metal conductor, or may be disposed in a segmented manner, so that a gap exists between the conductive rod and another metal conductor, and generation of metal particles can be reduced or even avoided without contact.

In other embodiments, the non-metal lining may be fixed on the conductive rod, that is, the non-metal lining only needs to be fixedly connected with the conductive rod or any one of the inner wall of the first through hole, the inner wall of the second through hole, and the inner wall of the convex ring.

In this embodiment, the non-metallic liner 330 is a teflon liner. The polytetrafluoroethylene lining has good insulation and wear resistance, and the lining is guaranteed to be not worn and continuously effective in the operation process of the wall bushing to the maximum extent.

In other embodiments, the non-metal liner may be any one of a polyester liner, a glass fiber liner, or other liners having insulating and wear-resistant properties.

The wall bushing 300 of the present embodiment, due to the non-metal liner 330, can reduce or avoid the contact between the conductive rod 320 and other metal conductors, reduce the generation of metal particles, and improve the reliability of the product operation.

Example four:

as shown in fig. 4 to 5, the present embodiment provides a wall bushing 400, which is different from the third embodiment in the structure of the connection terminal 440 of the wall bushing 400 of the present embodiment.

In this embodiment, the connection terminal 440 includes a connection portion 441, a receiving portion 442 and a second connection portion 443 in sequence, the receiving portion 442 is used for receiving an end portion of the conductive rod 420 and electrically connected to the conductive rod 420, and the second connection portion 443 is hermetically connected to an upper end portion of the transition tank 411. The terminal block 440 is an electrical connection component of the wall bushing 400 for making electrical connections with other equipment. The second connection portion 443 is provided to facilitate the fixed connection of the connection terminal 440 with the transition tank 441.

In the present embodiment, a second sealing groove 414 is disposed between the second connecting portion 443 of the terminal 440 and the upper end of the transition tank 411, a second sealing ring (not shown) is disposed in the second sealing groove 414, and specifically, the second sealing groove 414 is disposed at the upper end of the transition tank 411. In other embodiments, the second seal groove may be provided at the second connection portion, or both the second connection portion and the upper end portion of the transition tank may be provided with the seal groove.

In this embodiment, the second connecting portion 443 is provided with a through hole 4431, the upper end of the transition tank 411 is correspondingly provided with a screw hole, and the second connecting portion 443 is connected with the transition tank 411 by a screw (not shown). In other embodiments, the second connection portion and the transition tank may be connected by gluing, welding or a combination of the above fixing connection manners.

In this embodiment, a spring finger 444 is disposed at an end of the conductive rod 420, the spring finger abuts against an inner wall of the accommodating portion 442, and a gap 446 is formed between the accommodating portion 442 and the end of the conductive rod 420 along an axial direction of the conductive rod 420. The spring fingers 444 are simultaneously in close contact with the inner wall of the accommodating portion 442 and the end of the conductive rod 420, so that the connection terminal 440 and the end of the conductive rod 420 have stable electrical connection, the head assembly can be maintained at the same potential, and the problem of head heat generation can be solved. A gap 446 is formed between the accommodating portion 442 and the end of the conductive rod 420 along the axial direction of the conductive rod, so that the deformation of the conductive rod 420 caused by thermal expansion and cold contraction can be absorbed, and the conductive rod 420 is prevented from being bent due to fixed connection.

In this embodiment, a ring groove 445 is formed on the inner wall of the accommodating portion 442, a spring finger 444 is received in the ring groove 445, and the spring finger 444 abuts against the inner wall of the accommodating portion 442, so that the accommodating portion 442 is electrically connected to the end of the conductive rod 420, the head assembly is kept at the same potential, and the problem of head heat generation is solved. In other embodiments, the accommodating portion may not have a ring groove therein, and a certain gap exists between the inner wall of the accommodating portion and the end of the conductive rod, so that the spring contact finger can be pressed between the inner wall of the accommodating portion and the conductive rod, and the spring contact finger can be maintained in a relatively fixed state.

The wall bushing 400 of this embodiment, because binding post 440's structure sets up ingeniously, satisfied the head of wall bushing 400 and possessed the requirement of electricity connection and equipotential, can absorb the deformation of conducting rod 420 expend with heat and contract with cold simultaneously, avoid conducting rod 420 to produce the bending because of fixed connection.

Example five:

as shown in fig. 6 to 7, the present embodiment provides a wall bushing 500, which is different from the fourth embodiment in that the wall bushing 500 of the present embodiment is further provided with a hollow insulator 550.

In this embodiment, the wall bushing 500 further includes a hollow insulator 550, a flange 551 of the hollow insulator 550 is hermetically connected to the lower surface of the transition plate 512, and the conductive rod 520 penetrates through the hollow insulator 550. The hollow insulator 550 provides insulation protection for the inner conductor of the wall bushing 500.

In this embodiment, a third sealing groove 5511 is disposed between the flange 551 of the hollow insulator 550 and the transition plate 512, a third sealing ring (not shown) is disposed in the third sealing groove 5511, and specifically, the flange 551 is disposed with the third sealing groove 5511. In other embodiments, the third seal groove may be disposed on the lower surface of the transition plate, or both the flange and the lower surface of the transition plate may be provided with seal grooves.

In this embodiment, the head assembly 510 is provided with a pressure equalizing ball 560 at the periphery thereof, and the pressure equalizing ball 560 is fixedly connected to the head assembly 510. The function of the voltage-equalizing ball 560 is to equalize the voltage, ensuring that no abnormal corona discharge occurs in the charged head assembly 510. The end of the wall bushing 500 is also provided with a pressure equalizing ball.

In this embodiment, the conductive rod 520 is inserted into the hollow insulator 550 and fixedly connected to the end of the wall bushing 500, so that the conductive rod 520 passing through the head assembly 510 is prevented from displacement without thermal expansion or cold contraction.

In this embodiment, specifically, the wall bushing 500 has an overall structure that the conductive rod 520 is inserted into the hollow insulator 550 and fixedly connected to the end of the wall bushing 500, the conductive rod 520 only needs to pass through the head assembly 510, and since the connection terminal 540 is connected to the transition tank 511 in a sealing manner, the conductive rod 520 and the transition tank 511 do not need to be fixed and connected in a sealing manner, so that an axial dynamic sealing device can be prevented from being used between the transition tank 511 and the conductive rod 520, thereby greatly improving the sealing reliability of the product, and meanwhile, since the bellows is omitted, the production cost can be reduced. And when the length of the conducting rod 520 changes due to thermal expansion and cold contraction, the tail end of the conducting rod 520 is fixed, and the head of the conducting rod 520 and the transition tank 511 can move axially relative to each other, and at this time, because a gap 546 exists between the terminal 540 and the end of the conducting rod 520, the gap 546 provides a space for axial movement, and the conducting rod 520 cannot bend due to the increase of the length, so that the reliability of the product can be improved.

In this embodiment, the hollow insulator 550 is a composite insulator made of a composite material, and the composite insulator has light weight, low cost, and excellent insulating property and mechanical property. In other embodiments, the hollow insulator 550 may be a porcelain insulator or the like made of other materials.

In this embodiment, the hollow insulator 550 is a two-section insulator, and a mounting structure 552 is disposed between the two-section insulator, and the mounting structure 552 is used for mounting the wall bushing 500 on a wall. That is, the wall bushing 500 includes a connection terminal 540, a transition tank 511, a transition plate 512, and a hollow insulator 550, which are connected in sequence, wherein the conductive rod 520 is inserted into the hollow insulator 550, an end of the conductive rod 520 is connected to the connection terminal 540, and a distal end of the conductive rod 520 is fixed to a distal end of the hollow insulator 550.

The wall bushing 500 may be installed at an oblique angle or horizontally along its axis. In the embodiment, the wall bushing 500 is installed obliquely, and the head of the wall bushing 500 is higher than the end of the wall bushing 500, in this case, the metal particles existing in the transition tank 511 will fall into the annular groove 5112 due to the gravity, and the annular groove 5112 acts as a particle trap to adsorb the metal particles in the transition tank 511, thereby preventing the metal particles from floating and migrating in the transition tank 511, and ensuring the stable electrical performance of the head of the wall bushing 500.

The utility model discloses a wall bushing simple structure has saved the structure of bellows, can avoid adopting axial dynamic seal device, has improved product sealing reliability greatly, can reduction in production cost simultaneously.

While the invention has been described with reference to the above disclosure, it will be understood by those skilled in the art that various changes and modifications in the above-described structures and materials, including combinations of features disclosed herein either individually or in any combination, will be apparent to one skilled in the art from the disclosure herein. These variants and/or combinations fall within the technical field of the present invention and are intended to be protected by the following claims.

Claims (10)

1. A wall bushing, its characterized in that: the electric connector comprises a head assembly, a conductive rod and a wiring terminal, wherein the wiring terminal is hermetically covered on the head assembly and the conductive rod and is electrically connected with the conductive rod;

the upper end part of the transition tank is provided with a first through hole, and the lower end part of the transition tank is communicated with the first through hole; the transition plate is provided with a second through hole, the conducting rod penetrates through the first through hole and the second through hole, and the transition tank and the transition plate are fixedly connected so that the conducting rod is surrounded in the transition tank to form an accommodating cavity.

2. A wall bushing according to claim 1, wherein: a plurality of annular grooves are formed in the transition tank and surround the side wall of the conducting rod.

3. A wall bushing according to claim 1, wherein: the lower end of the transition tank extends out of a first connecting part along the periphery of the transition tank, and the first connecting part is connected with the transition plate in a sealing mode.

4. A wall bushing according to claim 1, wherein: and a non-metal lining is arranged on the inner wall of the first through hole and/or the inner wall of the second through hole.

5. A wall bushing according to claim 4, wherein: the non-metal lining is a polytetrafluoroethylene lining.

6. A wall bushing according to claim 1, wherein: the wiring terminal sequentially comprises a wiring portion, an accommodating portion and a second connecting portion, the accommodating portion is used for accommodating the end portion of the conducting rod and electrically connected with the conducting rod, and the second connecting portion is connected with the upper end portion of the transition tank in a sealing mode.

7. A wall bushing according to claim 6, wherein: the end part of the conducting rod is provided with a spring contact finger which is abutted against the inner wall of the accommodating part, and a gap is formed between the accommodating part and the end part of the conducting rod along the axial direction of the conducting rod.

8. A wall bushing according to claim 1, wherein: the part of the conducting rod, which is positioned at and above the transition tank, is of a solid structure, and the part of the conducting rod, which is positioned below the transition tank, is of a hollow structure.

9. A wall bushing according to claim 1, wherein: and a convex ring is arranged on the lower surface of the transition plate around the second through hole.

10. A wall bushing according to claim 9, wherein: the wall bushing further comprises a hollow insulator, a flange of the hollow insulator is connected with the lower surface of the transition plate in a sealing mode, and the conducting rod penetrates through the hollow insulator.

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