WO2018006713A1

WO2018006713A1 - Insulation pull bar

Info

Publication number: WO2018006713A1
Application number: PCT/CN2017/089674
Authority: WO
Inventors: 马斌; 方江; 朱兴祥; 高俊; 汪强
Original assignee: 江苏神马电力股份有限公司
Priority date: 2016-07-05
Filing date: 2017-06-23
Publication date: 2018-01-11
Also published as: CN105977066A; CN105977066B

Abstract

An insulation pull bar (100) comprises an insulation pipe (101) and joints (102) fitted to the two ends of the insulation pipe (101). Each joint (102) comprises an insertion end (110) in axial fitting connection with the insulation pipe (101) and an exposing end (120) extending out from the insertion end (110). A wedge-shaped glue receiving cavity (130) is arranged between the insertion end (110) and the insulation pipe (101). A glue liquid (131) is filled into the wedge-shaped glue receiving cavity (130). According to the insulation pull bar (100), the wedge-shaped glue receiving cavity (130) is arranged between the insertion end (110) and the insulation pipe (101), the wedge-shaped glue receiving cavity structure of the insulation pull bar (100) enables the insulation pull bar (100) to spread a stress surface when being pulled, which effectively improves the stress condition of a glued connection part, and increases the tensile strength, so that safety and reliability are achieved.

Description

Insulated tie rod

Technical field

The invention relates to a power transmission insulation device, in particular to an insulation rod.

Background technique

Insulated tie rods are important components of circuit breakers. They have high requirements on electrical and mechanical properties. The quality of insulation rods directly affects the reliability of circuit breakers and the safe operation of the power grid. The insulating tie rod generally comprises an insulating tube and a joint glued on both ends of the insulating tube, and an adhesive is adhered between the inner wall surface of the insulating tube and the outer surface of the joint to form an insulating tie rod.

Conventional insulating rods generally have a certain roughness on the inner wall of the insulating tube and the outer wall of the joint or a threaded fit to improve the bonding strength. When in use, the tensile force acting on the joint will be transmitted to the insulating tube, causing the bonding and fixing structure between the inner wall surface of the insulating tube and the outer surface of the joint to be concentrated. When the force exceeds a certain limit, the bonded solid structure will be Destruction, but the tensile structure can withstand limited tension, the thread structure is easy to wear due to tensile force, the connection strength is low, the joint and the insulation tube are easy to fall off, causing serious power failure, even endangering personal safety and improving operation and maintenance. cost.

Summary of the invention

In view of the deficiencies of the prior art, the object of the present invention is to provide an insulating tie rod which is convenient to manufacture, has high tensile strength, and is safe and reliable.

In order to achieve the above object, the technical means adopted by the present invention are as follows: an insulating tie rod comprising an insulating tube and a joint coupled to both ends of the insulating tube, the joint comprising an insertion end axially mated with the insulating tube and An exposed end extending from the insertion end, a wedge-shaped adhesive cavity is disposed between the insertion end and the insulating tube, and the wedge-shaped adhesive cavity is filled with glue.

In the above-mentioned insulating rod, since the wedge-shaped rubber-filling cavity is arranged between the insertion end and the insulating tube, the wedge-shaped rubber-filling structure enables the insulating rod to disperse the force-receiving surface when subjected to the tensile force, thereby effectively improving the stress of the glued joint and improving the force. Tensile strength, safe and reliable.

Preferably, the insulating tube has a straight cylindrical shape, and the insertion end is inserted into the insulating tube, and the wedge-shaped adhesive cavity is disposed between the outer wall of the insertion end and the inner wall of the insulating tube.

Preferably, the insertion end is provided with a receiving cavity, the insulating tube is inserted into the receiving cavity, and the wedge-shaped adhesive cavity is disposed between the inner wall of the receiving cavity and the outer wall of the insulating tube.

Preferably, at least two through holes communicating with the wedge-shaped cavity are disposed on the insulating rod. In this way, it is convenient to inject glue from one of the through holes into the wedge-shaped adhesive cavity during the plastic binding, and discharge the air from the other through holes, which is convenient to operate and sufficient to ensure the strength of the adhesive.

Preferably, the insertion end or the insulating tube is provided with at least one wedge-shaped recess to form the wedge-shaped plastic cavity, and the bottom surface and the outer end surface of the wedge-shaped groove are wedge-shaped. In this way, the wedge-shaped adhesive cavity can be conveniently formed, and the stepped rib formed between the bottom surface of the wedge-shaped groove and the end surface thereof and the wall surface of the insertion end or the insulating tube can bear the tensile force, can disperse the force surface, and effectively improve the binding The force of the joint is increased, and the tensile strength is improved, which is safe and reliable.

Preferably, the wedge-shaped recess is circumferentially disposed circumferentially along the axial direction of the insulating tube. This facilitates the processing of the wedge-shaped grooves and forms a continuous adhesive space, and avoids stress concentration caused by sudden changes in size, and avoids affecting the overall strength of the insulating tie rod.

Preferably, the wedge grooves are at least two and disposed adjacent to each other along the axial direction of the insulating tube, and a cylindrical portion is disposed between two adjacent wedge grooves. Such a plurality of wedge-shaped grooves respectively form relatively independent plastic cavities, and the small volume is easy to achieve uniform injection, thereby ensuring a good glue loading effect.

Preferably, the diameter of the wedge-shaped groove away from the exposed end is smaller than the diameter of the exposed end. This facilitates the mating operation of the joint and the insulating tube, and the tensile performance is better due to the overall stress of the bonded structure when subjected to tension.

Preferably, the diameter of the cylindrical section is adapted to the diameter of the insulating tube, and the cylindrical section is provided with at least one flow tank communicating with two adjacent wedge-shaped recesses. In this way, when the joint is matched with the insulating tube, the cylindrical section can serve as a reference to ensure the coaxiality of the mating, and can support the insulating tube or the tube wall of the receiving cavity to improve the strength of the mating portion. The flow glue tank can make the glue liquid conveniently fill the wedge-shaped plastic cavity of the plurality of wedge-shaped grooves, and avoid the contact between the cylindrical section and the inner wall of the insulating tube is too tight, which affects the sufficient injection of the glue.

Preferably, a portion of the insertion end away from the exposed end is a head, a first sealing groove is disposed between the head and the insulating tube, and a first sealing ring is disposed in the first sealing groove. In this way, the wedge-shaped plastic cavity and the insulating pipe wall can be sealed, and the leakage of the glue liquid is prevented, thereby causing insufficient injection of the glue in the wedge-shaped cavity, thereby avoiding the influence of the bonding effect and avoiding the waste of the glue.

Preferably, the portion of the insertion end adjacent to the exposed end is a tail portion, a second sealing groove is disposed between the tail portion and the insulating tube, and a second sealing ring is disposed in the second sealing groove. This way One-step sealing of the wedge-shaped plastic cavity and the insulating pipe wall prevents the leakage of the glue liquid, resulting in insufficient injection of the glue in the wedge-shaped cavity, thereby avoiding the influence of the bonding effect and avoiding the waste of the glue.

Preferably, the exposed end is provided with a stop at a position in contact with the end of the insulating tube, and the retaining edge abuts against the end surface of the insulating tube. Thus, when the joint and the insulating tube are mated, the retaining edge can be easily assembled and positioned by forming an abutting contact with the end of the insulating tube.

Preferably, the joint is provided with an exhaust hole penetrating in the axial direction of the insulating tube. This makes it easy to fill the inside of the insulating tube with insulating gas to ensure insulation performance.

Preferably, the insulating tube or the end of the insertion end is provided with a first tapered surface for easy fitting.

Preferably, the insulating tube has an inner diameter equal to the insertion end insertion portion. This makes it easy to insert the insertion end into the insulating tube.

Preferably, the inner diameter of the insertion portion of the insulating tube in the receiving chamber is equal. This makes it easy to insert the insulating tube into the receiving chamber.

Preferably, a blocking member is disposed in the through hole. This can prevent moisture from penetrating into the wedge-shaped cavity by the through hole, which causes the cured glue to age and weaken the bond strength.

Preferably, at least one glue groove is disposed in the wedge-shaped cavity. The solid glue tank can be arranged to store more glue in the wedge-shaped rubber cavity, the bonding effect is better, and the connection between the joint and the insulating tube is stronger.

Preferably, the through holes are provided on the same bus bar of the insulating tube. This makes it easy to see if the glue fills the wedge-shaped cavity.

Preferably, at least one of the through holes is a threaded hole. This can increase the strength of the connection between the blocking member and the through hole, so that the sealing is reliable.

DRAWINGS

1 is a partial cross-sectional view of an insulating tie rod 100 according to a first embodiment of the present invention;

2 is a partial enlarged cross-sectional view showing the connection of the joint 102 and the insulating tube 101 on the insulating tie rod 100 according to the first embodiment of the present invention;

Figure 3 is a schematic view of a joint 102 in accordance with a first embodiment of the present invention;

Figure 4 is a partially enlarged cross-sectional view showing an insulating tube 101 according to Embodiment 1 of the present invention;

Figure 5 is a view showing a portion of the insulating tie rod upper joint 202 connected to the insulating tube 201 according to the second embodiment of the present invention. Enlarged sectional view;

Figure 6 is a partially enlarged cross-sectional view showing the connection of the insulating tie rod upper joint 302 and the insulating tube 301 according to the third embodiment of the present invention;

Figure 7 is a partially enlarged cross-sectional view showing the connection of the insulating tie rod upper joint 402 and the insulating tube 401 according to the fourth embodiment of the present invention;

Figure 8 is a partially enlarged cross-sectional view showing the connection of the insulating tie rod upper joint 502 and the insulating tube 501 according to the fifth embodiment of the present invention.

detailed description

Specific embodiments of the invention are disclosed herein as required. However, it should be understood that the embodiments disclosed herein are merely exemplary of the invention and may be embodied in various forms. Therefore, the specific details disclosed herein are not to be construed as limiting, but rather as the basis of the claims, and as a representative basis for teaching the skilled in the art to apply the present invention differently in any suitable manner in practice. This includes the use of various features disclosed herein in conjunction with features that may not be explicitly disclosed herein.

Embodiment 1:

As shown in FIG. 1 and FIG. 2, the insulating tie rod 100 of the present embodiment includes an insulating tube 101 in a straight cylindrical shape and a joint 102 coupled to both ends of the insulating tube 101. The joint 102 includes an insulating tube 101 inserted axially along the insulating tube 101. The insertion end 110 and the exposed end 120 extending from the insertion end 110. A wedge-shaped adhesive cavity 130 is disposed between the outer wall of the insertion end 110 and the insulating tube 101. The wedge-shaped adhesive cavity 130 is filled with a glue 131. The insulating tube 101 is provided with two wedge-shaped adhesive cavities 130 on the wall corresponding to the insertion end 110. Through holes 103 that communicate with each other.

In the present embodiment, the insulating tube 101 is an epoxy resin impregnated glass fiber wound insulating tube or other composite insulating tube, and the joint 102 is made of a metal material such as aluminum alloy or stainless steel.

Specifically, referring to FIGS. 2 and 3, the insertion end 110 has a cylindrical shape as a whole, and its outer diameter is adapted to the inner diameter of the insulating tube 101. Two insertion grooves 111 axially adjacent to the insulating tube 101 are disposed on the insertion end 110, and the diameter of the portion of the wedge groove 111 away from the exposed end 120 is smaller than the diameter of the portion near the exposed end 120. The bottom surface 1111 of the wedge-shaped groove 111 has a wedge shape with the outer end surface. In the embodiment, the outer end surface of the wedge-shaped groove 111, that is, the cylindrical surface of the wedge-shaped groove 111 having the largest diameter, that is, the cylinder in FIG. The outer circumference of the segment 112. The bottom surface 1111 of the wedge groove 111 is a conical surface, and may of course be a pyramid surface. After the insertion end 110 is inserted into the insulating tube 101, a space formed between the wedge-shaped recess 111 and the inner wall of the insulating tube 101 is a wedge-shaped adhesive cavity 130. A stepped rib 114 is formed between the small-diameter end of the wedge-shaped recess 111 and the outer wall of the insertion end 110. When the insulating rod 100 is subjected to a tensile force, the step rib 114 and the bottom surface of the wedge-shaped recess 111 can simultaneously receive tensile force and can disperse the force. The surface effectively improves the stress on the joint of the plastic part, improves the tensile strength, and improves the safety performance. Of course, the invention is not limited thereto, and the diameter of the portion of the wedge groove 111 away from the exposed end 120 may also be larger than the diameter of the portion near the exposed end 120. In the present embodiment, the wedge-shaped recess 111 is circumferentially circumferentially disposed on the outer wall of the insertion end 110 in the axial direction of the insulating tube 101, and has a continuous annular shape, so that a continuous adhesive space can be formed. Of course, the present invention is not limited thereto, and a plurality of wedge-shaped grooves 111 may be spaced apart on the outer wall of the insertion end 110 as long as the glue 131 can be accommodated.

Referring to FIG. 2 and FIG. 4, in the embodiment, the two through holes 103 are optical holes, and the two through holes 103 are respectively disposed on the insulating tube 101 corresponding to the ends of the insertion end 110, and are respectively formed with two wedge-shaped concaves. The slots 111 correspond to each other, and the two through holes 103 are disposed on the same bus bar of the insulating tube 101. During the gluing, the glue 131 is injected from one of the through holes 103 into the wedge-shaped cavities 130, and the air is discharged from the other through holes 103. Since the two through holes 103 are disposed on the same bus bar of the insulating tube 101, the operator can conveniently and intuitively observe whether the glue 131 overflows in the other through hole 103 while injecting the glue 131, and ensure the glue. The liquid 131 is sufficiently injected and the bonding is reliable. Of course, the present invention is not limited thereto, and the number of the through holes 103 may be one or three or more as long as the smooth and sufficient injection of the glue 131 can be ensured. The plurality of through holes 103 may also be disposed at any position on the wall of the insulating tube 101 as long as it can communicate with the wedge shaped cavities 130.

Referring to Figures 2 and 3, a cylindrical section 112 is provided between the adjacent two wedge-shaped recesses 111 to accommodate the inner diameter of the insulating tube 101. The small-diameter end of the wedge-shaped recess 111 near the exposed end 120 side also forms a stepped rib 114 with the end of the cylindrical section 112. The stepped rib 114 can also withstand partial tension, enhance tensile strength, and improve safety.

Specifically, the cylindrical section 112 is provided with a flow tank 113 that communicates with the adjacent two wedge-shaped recesses 111. In this embodiment, the flow tank 113 is a rectangular groove disposed on the outer wall of the cylindrical section 112 along the axial direction of the insulating tube 101. The two ends of the flow tank 113 communicate with the adjacent two wedge-shaped recesses 111, and the flow tank The portion of the 113 end which is connected to the wedge groove 111 is curved, so that the glue 131 can be injected during the injection. Conveniently, one of the wedge-shaped grooves 111 flows through the cylindrical section 112 and flows into the other wedge-shaped recess 111, so that the molten liquid 131 can be sufficiently filled into the wedge-shaped adhesive cavity 130 to ensure the bonding strength. Of course, a multi-channel glue tank 113 may also be provided, and the cross-section of the glue tank 113 may also be triangular, semi-circular or the like. Of course, the present invention is not limited thereto, and the diameter of the cylindrical section 112 can also be smaller than the inner diameter of the insulating tube 101, so that it is not necessary to provide the glue flow tank 113, and the glue cavity 131 can be fully filled into the wedge-shaped adhesive cavity 130 to be glued. .

2 and FIG. 3, the portion of the insertion end 110 away from the exposed end 120 is a head 115. The outer wall of the head 115 is provided with a first sealing groove 116, and the first sealing groove 116 is provided with a first sealing ring 132. The portion of the insertion end 110 near the exposed end 120 is a tail portion 117. The outer wall of the tail portion 117 is provided with a second sealing groove 118, and the second sealing groove 118 is provided with a second sealing ring 133. The first sealing groove 116 and the first sealing ring 132 can seal the wedge-shaped adhesive cavity 130 and the inner wall of the insulating tube 101 to prevent the glue 131 from leaking into the insulating tube 101, thereby causing insufficient injection of the glue 131 in the wedge-shaped adhesive cavity 130. So as to avoid affecting the bonding effect and avoid wasting glue. The second sealing groove 118 and the second sealing ring 133 can seal between the wedge-shaped adhesive cavity 130 and the outside, preventing the glue 131 from leaking from the bottom of the insertion end 110 to the exposed end 120, thereby avoiding waste of the glue 131 and ensuring The surface of the insulating rod 100 is clean.

Specifically, in the embodiment, the first sealing groove 116 and the second sealing groove 118 are both rectangular in cross section along the axial direction of the insulating tube 101, and the first sealing ring 132 and the second sealing ring 133 are rectangular sealing rings. It is made of any material such as EPDM, nitrile rubber, fluororubber or fluorosilicone rubber. Of course, the present invention is not limited thereto, and the cross section of the first sealing groove 116 and the second sealing groove 118 along the axial direction of the insulating tube 101 may be trapezoidal, triangular or the like; the first sealing ring 132 and the second sealing ring 133 may also be O-ring seals, trapezoidal seals, special-shaped seals, etc. are used. Similarly, a plurality of first sealing grooves 116 and second sealing grooves 118 may be provided, and a plurality of first sealing rings 132 and second sealing rings 133 are correspondingly matched to ensure a sealing effect.

Referring to FIG. 2 and FIG. 3, the outer diameter of the exposed end 120 is smaller than the outer diameter of the insulating tube 101 but larger than the inner diameter of the insulating tube 101, and the exposed end 120 is connected to the insertion end 110 to form a blocking edge 121, which is inserted at the insertion end 110. After the insulating tube 101 is in the middle, the retaining edge 121 abuts against the end surface of the insulating tube 101 to form an abutting contact, so that the assembly positioning can be conveniently performed. Of course, the present invention is not limited thereto, and the outer diameter of the exposed end 120 may also be smaller than the inner diameter of the insulating tube 101, and an annular protrusion may be provided as a blocking edge 121 at a position where the exposed end 120 is in contact with the end of the insulating tube 101. Or other ways to form abutment Contact for assembly positioning.

Referring to Fig. 2, a vent hole 119 penetrating in the axial direction of the insulating tube 101 is disposed on the joint 102. The vent hole 119 is provided to conveniently fill the inside of the insulating tube 101 with an insulating gas to ensure insulation performance. Specifically, the exhaust hole 119 has a circular cross section and is disposed concentrically with the insulating tube 101. Of course, the present invention is not limited thereto, and the cross section of the vent hole 119 may be other shapes such as a square, a triangle, a polygon, a profile, or the like, or may not be disposed concentrically with the insulating tube 101 as long as it can be realized to the inside of the insulating tube 101. Fill with insulating gas.

2 and 4, the inner wall of the end portion of the insulating tube 101 is provided with a first tapered surface 104 for facilitating the insertion of the insertion end 110. Specifically, the first tapered surface 104 is a conical surface, and may of course be a pyramidal surface. The diameter of the portion of the first tapered surface 104 away from the exposed end 120 is smaller than the diameter of the portion near the exposed end 120. The diameter of the portion of the first tapered surface 104 near the exposed end 120 is slightly larger than the outer diameter of the insertion end 110, and the first tapered surface 104 is along the insulating tube. The axial length of 101 is subject to the ease of insertion.

Referring to Fig. 4, the insulating tube 101 has an inner diameter equal to the inner wall 105 of the insertion portion of the insertion end 110. In the present embodiment, the insulating tube 101 is formed by winding epoxy resin-impregnated glass fibers on a core mold and solidifying. In order to facilitate demolding, the core mold generally has a certain taper, and thus the inner wall of the manufactured insulating tube 101 is a cone. Since the insertion end 110 has a cylindrical shape as a whole and its outer diameter is adapted to the inner diameter of the insulating tube, if it is directly inserted into the insulating tube 101, the inner wall of the insulating tube 101 is worn, which affects the overall strength of the insulating tube 101. The inner diameter of the inner wall 105 is made equal by turning or grinding, that is, the inner wall 105 is partially cylindrical, so that the insertion end 110 can be smoothly inserted into the insulating tube 101, and the overall strength of the insulating tube 101 can be ensured.

Embodiment 2:

Referring to Fig. 5, the second embodiment of the present invention is substantially the same as the first embodiment. Unlike the first embodiment, only one wedge-shaped recess 211 is provided on the insertion end 210. Two through holes 203 are respectively disposed on the two bus bars opposite to each other in the radial direction of the insulating tube 201. The vent hole 219 is not provided on the joint 202, but is disposed on the outer wall of the insulating tube 201 to communicate with the outside and the inner wall of the insulating tube 201.

Of course, the present invention is not limited thereto, and the wedge-shaped recess 211 may not be disposed on the insertion end 210, but the wedge-shaped adhesive cavity 230 may be directly formed between the outer wall of the insertion end 210 and the inner wall of the insulating tube 201, or may be in the insulating tube. A wedge groove 211 is provided in the inner wall of 201 as long as the joint 202 can be bonded to the insulating tube 201. Obviously, three or more wedges can also be placed on the insertion end 210. Shaped groove 211.

In the present embodiment, the through hole 203 is a threaded hole, and a blocking member (not shown) is further disposed in the through hole 203. The sealing member may be a screw or a rubber stopper or the like, and a screw or a rubber plug or the like is screwed into the through hole 203, and the glue is filled with a gap between the sealing member and the through hole 203. In this way, it is possible to prevent moisture from penetrating into the wedge-shaped adhesive cavity 230 through the through hole 203, thereby causing the cured rubber to age and weaken the bonding strength.

In the present embodiment, the first sealing groove 216 is disposed on the inner wall of the insulating tube 201 corresponding to the head portion 215, and the first sealing ring 232 is disposed in the first sealing groove 216. of course. The second sealing groove may also be disposed on the inner wall of the insulating tube 201, and details are not described herein.

In this embodiment, an annular glue groove 234 is further disposed in the wedge-shaped cavity 302. In this way, more glue can be stored in the wedge-shaped adhesive cavity 230, the bonding effect is better, and the connection between the joint 202 and the insulating tube 201 is stronger. The cross section of the solid groove 234 in the axial direction of the insulating tube 201 is a rectangle, and it is obvious that other shapes such as a trapezoid or a triangle may be used. Specifically, four solid glue grooves 234 are disposed on the inner wall of the insertion end 210, and four solid glue grooves 234 are disposed on the outer wall of the insulating tube 201 at corresponding positions in the wedge-shaped plastic cavity 230. Obviously, the present invention is not limited thereto, and one or more glue grooves 234 may be disposed only on the outer wall of the insertion end 210 or only on the inner wall of the insulating tube 201 at a corresponding position in the wedge-shaped plastic chamber 230. Of course, the glue groove 234 may be disposed in a spiral shape or the like along the axial direction of the insulating tube 201.

Embodiment 3:

Referring to Fig. 6, the third embodiment of the present invention is substantially the same as the first embodiment. In the present embodiment, two wedges are disposed on the inner wall of the insulating tube 301 and the outer wall of the insertion end 310 in this embodiment. Groove 311. The wedge-shaped recess 311 on the inner wall of the insulating tube 301 is disposed corresponding to the wedge-shaped recess 311 on the outer wall of the insertion end 310, and the space formed correspondingly is the wedge-shaped adhesive cavity 330. In this way, more glue 331 can be accommodated, the adhesive strength is effectively enhanced, and when the insulating rod is subjected to the pulling force, the insulating tube 301 and the bottom surface of the wedge groove 311 on the insertion end 110 and the step rib 314 can simultaneously receive the pulling force. Disperse the force surface, effectively improve the stress on the joint of the plastic joint, improve the tensile strength and improve the safety performance.

Of course, the present invention is not limited thereto, and the wedge-shaped recess 311 on the inner wall of the insulating tube 301 and the wedge-shaped recess 311 on the outer wall of the insertion end 110 may also be disposed, and correspondingly, the inner wall of the insulating tube 301 The space formed by the wedge-shaped recess 311 and the outer wall of the insertion end 110 is a wedge-shaped adhesive cavity 330. The space formed by the wedge-shaped recess 311 on the outer wall of the insertion end 110 and the inner wall of the insulating tube 301 is also a wedge-shaped adhesive cavity 330.

Embodiment 4:

Referring to FIG. 7, the fourth embodiment of the present invention is substantially the same as the first embodiment. The first embodiment is different from the first embodiment. In this embodiment, the insertion end 410 is provided with a receiving cavity 440, and the insulating tube 401 is inserted into the receiving cavity 440. A wedge-shaped adhesive cavity 430 is disposed between the inner wall of the receiving cavity 440 and the outer wall of the insulating tube 401. Specifically, the receiving cavity 440 is a circular blind hole whose inner diameter is adapted to the outer diameter of the insulating tube 401. Two annular wedge-shaped recesses 411 are formed in the inner wall of the receiving cavity 440. The space formed between the wedge-shaped recess 411 and the outer wall of the insulating tube 401 is a wedge-shaped adhesive cavity 430.

A first sealing groove 416 is disposed on the inner wall of the head 415, and a first sealing ring 432 is disposed in the first sealing groove 416. A second sealing groove 418 is disposed on the inner wall of the tail portion 417, and a second sealing ring 433 is disposed in the second sealing groove 418. This can seal the wedge-shaped adhesive cavity 430, preventing the glue 431 from leaking and avoiding waste. The through hole 403 is disposed on the outer wall of the insertion end 410 and communicates with the wedge shaped cavity 430 to facilitate the injection of the glue 431. Of course, the present invention is not limited thereto, and the through hole 403 may not be provided, but the glue 431 is applied to the outer wall of the insulating tube 401, and the insulating tube 401 is inserted into the receiving cavity 440 for binding.

A first tapered surface 404 is disposed on the outer wall of the end of the insulating tube 401 to facilitate insertion of the insulating tube 401 into the receiving cavity 440. The inner diameter of the receiving cavity 440 is equal to facilitate the smooth insertion of the insulating tube 401. The inner wall end of the receiving cavity 440 naturally forms a blocking edge 421 to form an abutting contact for the assembly position after the insulating tube 401 is inserted.

Of course, the present invention is not limited thereto, and the wedge-shaped recess 411 may be disposed on the outer wall of the insulating tube 401 or at the same time, a plurality of wedge-shaped recesses 411 are formed on the inner wall of the receiving cavity 440 and the outer wall of the insulating tube 401 to form the wedge-shaped adhesive cavity 430. .

Embodiment 5:

Referring to Fig. 8, the fifth embodiment of the present invention is substantially the same as the first embodiment. Unlike the first embodiment, in the present embodiment, the insertion end 510 includes an inner insertion end 550 inserted into the inside of the insulating tube 501 and is insulated. The outer insertion end 560 into which the tube 501 is inserted, the space formed between the inner insertion end 550 and the outer insertion end 560 is a receiving cavity 540. In the present embodiment, the outer insertion end 560 and the inner insertion end 550 are provided separately. Specifically, the outer insertion end 560 is a circular sleeve, and the tail portion 517 is opposite to the exposed end 520. Internal threads (not shown) are provided on the inner wall of the contact, and external threads (not shown) are provided at corresponding positions on the exposed end 520. The outer insertion end 560 is threadedly coupled to the exposed end 520.

Two annular wedge-shaped recesses 511 are defined in the inner wall of the outer insertion end 560. The space formed between the wedge-shaped recess 511 and the outer wall of the insulating tube 501 is a wedge-shaped adhesive cavity 530. Two annular wedge-shaped recesses 511 are disposed on the outer wall of the inner insertion end 550. The space formed between the wedge-shaped recess 511 and the inner wall of the insulating tube 501 is also a wedge-shaped adhesive cavity 530.

A first sealing groove 516 is also disposed on the inner wall of the upper portion 515 of the outer insertion end 560, and a first sealing ring 532 is disposed in the first sealing groove 516. A second sealing groove 518 is also disposed on the inner wall of the tail portion 517 of the outer insertion end 560, and a second sealing ring 533 is disposed in the second sealing groove 518. A first tapered surface 504 is also provided on the outer wall of the end of the insulating tube 501 and the inner wall of the end of the outer insertion end 560 to facilitate insertion of the insulating tube 501 into the receiving cavity 540. The through hole 503 is disposed on the outer wall of the outer insertion end 560 and communicates with the wedge-shaped adhesive cavity 530 between the outer insertion end 560 and the outer wall of the insulating tube 501 to facilitate the injection of the glue. When the glue is applied, the insulating tube 501 can be inserted into the receiving cavity 540 after the glue is applied to the inner insertion end 550, and then the outer insertion end 560 is connected to the exposed end 520 by threads, and is glued through the through hole 503.

Of course, the present invention is not limited thereto, and the outer insertion end 560 and the inner insertion end 550 may also be connected by means of gluing, riveting, interference fit, and the like. Alternatively, the outer insertion end 560 and the inner insertion end 550 may be integrally provided as long as they are convenient to manufacture and assemble.

The technical contents and technical features of the present invention have been disclosed above, however, it will be understood that those skilled in the art can make various changes and modifications to the above-described structures and materials, including separately disclosed or claimed herein. Combinations of technical features obviously include other combinations of these features. These variations and/or combinations are all within the technical scope of the present invention and fall within the scope of the claims of the present invention.

Claims

An insulating tie rod comprising an insulating tube and a joint coupled to both ends of the insulating tube, wherein the joint comprises an insertion end axially mated with the insulating tube and extending from the insertion end A wedge-shaped adhesive cavity is disposed between the insertion end and the insulating tube, and the wedge-shaped adhesive cavity is filled with glue.
The insulating tie rod according to claim 1, wherein said insulating tube has a straight cylindrical shape, said insertion end is inserted into said insulating tube, and said wedge is disposed between said outer wall of said insertion end and said inner wall of said insulating tube Describe the plastic cavity.
The insulating tie rod according to claim 1, wherein the insertion end is provided with a receiving cavity, the insulating tube is inserted into the receiving cavity, and the inner wall of the receiving cavity is disposed between the outer wall of the insulating tube and the outer wall of the insulating tube. Wedge shaped cavity.
The insulating tie rod according to claim 1, wherein at least two through holes communicating with the wedge-shaped adhesive cavity are disposed on the insulating rod.
The insulating tie rod according to claim 1, wherein at least one wedge-shaped recess is formed on the insertion end or the insulating tube to form the wedge-shaped adhesive cavity, and the bottom surface and the outer end surface of the wedge-shaped groove are wedge-shaped. .
The insulating tie rod according to claim 5, wherein said wedge-shaped recess is circumferentially disposed circumferentially along said insulating tube.
The insulating tie rod according to claim 5, wherein the wedge-shaped grooves are at least two and disposed adjacent to each other along the axial direction of the insulating tube, and a cylindrical portion is disposed between two adjacent ones of the wedge-shaped grooves. .
The insulating tie rod of claim 5 wherein said wedge shaped groove has a smaller diameter away from said exposed end than a diameter adjacent said exposed end.
The insulating tie rod according to claim 5, wherein the diameter of the cylindrical section is adapted to the diameter of the insulating tube, and the cylindrical section is provided with at least one flow connecting the two adjacent wedge-shaped grooves. Glue tank.
The insulating tie rod according to claim 1, wherein a position at which the exposed end is in contact with the end portion of the insulating tube is provided, and the blocking edge abuts against the end surface of the insulating tube.