RU2773337C1 - Spiral type connection clamp - Google Patents

Abstract

FIELD: electric power industry.

SUBSTANCE: invention relates to the field of electric power industry, namely to linear spiral clamps intended for connecting wires of overhead power lines. The connecting clamp, designed to connect two wires 1 and 2 of the same cross section, contains a connector 5 for the cores of the wires to be connected, formed by glued strands of spirals, at least one set of spirals of conductive lay 3 wound over the connector, and a set of power spirals of the protector-lock 6 wound on a conductive layer. The power spirals of the protector-retainer 6 outside the conductive layer 3 are wound with a transition directly to the connected wires 1, 2, while the section of the power spirals of the protector-retainer 6 is wound over the conductive layer 3, and the sections of the power spirals of the protector-retainer 6 are wound directly on connected wires 1, 2 are made with different diameters.

EFFECT: reducing the material consumption of the clamp and reducing its weight while maintaining reliability during operation.

5 cl, 1 dwg

Description

The invention relates to the field of electric power industry, namely to linear spiral clamps intended for connecting wires of overhead power lines. The invention can be used as linear fittings on overhead power lines of various voltage classes.

Known connecting clamp of the combined type according to the patent for the invention RU 2272343 C1, publ. 03/20/2006. The clamp consists of a connector in the form of a steel sleeve, a conductive layer in the form of aluminum spiral wires and a protector-lock. The steel cores of the connected wires are pressed with a steel sleeve; a conductive layer and a protector-lock are wound onto the bushing. The length of the pressed sleeve is selected within (5.5-15) d _c , where d _c is the diameter of the steel part of the connected wires, and the length of the conductive layer and the length of the power layer are selected based on (45-120) D _pp , where D _p is the diameter connected wires.

As the disadvantages of this analog, one can note the insufficient strength of the connection, the significant consumption of materials and the long time for mounting the clamp.

The closest technical solution is a connecting clamp for connecting wires in spans of overhead power lines according to utility model patent RU 133352 U1, publ. 10.10.2013. The connecting clamp is designed to connect the cores of the connected wires and provides the mechanical strength of the connection. During operation, a tensile force may fall on the core, reaching 70% of the breaking strength of the wire. The connecting clamp consists of spirals glued with abrasive, made of high-strength steel wire. The conductive layer ensures the conductive properties of the clamp. Conductive layer spirals are made of materials with low ohmic resistance. Depending on the brand of connected wires, the number of conductive layers in the clamp may be more than one. To give the structure additional strength properties to hold the connected wires, part of the length of the conductive spirals (strands) can be glued with an abrasive. To ensure tight permanent electrical contact and prevent slippage of the connected wires in the clamp, a protector-lock is wound over the conductive layer. Protector-lock spirals are made of high-strength steel wire. The protector-fixator can consist of both individual spirals and spirals glued into strands. Thus, the above design of the connecting clip has at least one twist of conductive spirals (strands), one connector, and a twist of spirals (strands) of the protector-retainer. To give the structure additional strength properties, part of the length of the conductive spirals (strands) is glued with an abrasive.

In the described analogs, there are spiral elements of a sufficiently large length, which is necessary to ensure the required strength, however, this leads to a large consumption of materials, while the difference in bending stiffness from the middle of the connection to the periphery reduces the resource resistance of the wire.

The technical problem solved by the claimed invention is to reduce the material consumption of the clamp and reduce the weight of the clamp while maintaining reliability in operation.

The solution to this problem is based on the use of helical elements with stepped geometry. This makes it possible to reduce the weight of the clamp, make the design more manufacturable, which is essential both in serial production and in operation, and also make the transition in changing the bending stiffness from the middle of the connection to the periphery more smooth.

The claimed invention, like the closest analogue, contains a connector for the cores of the wires to be connected, formed by glued strands of spirals, at least one set of spirals of a conductive layer wound over the connector, and a set of power protector-latch spirals wound on a conductive layer.

To solve the above technical problem, the power spirals of the protector-retainer outside the conductive layer are wound with a transition directly to the wires to be connected, while the section of the power spirals of the protector-retainer wound over the conductive layer, and the sections of the power spirals of the protector-retainer wound directly onto the wires to be connected are made with different diameters.

In addition, the strands of the connector spirals can be glued with an abrasive, both on the inside and on the outer surface of the strands. The spirals of the conductive layer, as well as the power spirals of the protector-retainer, can be assembled into strands and glued with or without abrasive application.

The technical result achieved in the manufacture and use of the claimed invention is that, other things being equal, the mass of the clamp is significantly reduced and the manufacturability of the design is improved. The concept of manufacturability of the design includes, among other things, the time to assemble the entire structure, the total material consumption, the time to repair during operation, etc. In the claimed invention, the listed components undergo a change in the direction of their reduction, which made it possible to make the design more technological. At the same time, a smoother transition is provided in changing the bending stiffness from the middle of the connection to the periphery, since the bending stiffness of the claimed design, the largest in the middle, gradually decreases towards the periphery - to the ends of the clamp, and the less the bending stiffness at the ends of the product differs from the bending stiffness of the wire itself, the more the service life of such a structure during operation.

The power spirals (strands) of the protector-retainer have a variable diameter along their length - a stepped design, which is characterized as follows: under the outer diameter of the spirals (strands) of the conductive lay, while outside the spirals of the conductive lay, the inner diameter of the power spirals (strands) of the protector-retainer corresponds to the outer diameter of the connected wires, and, which is significant, at the point of transition from the spirals of the conductive lay to the wires, the diameter changes power spirals (strands) of the protector-latch, as a result, in this place its shape is like a step.

Due to the proposed design, the power spirals (strands) of the protector-retainer tightly press the spirals (strands) of the conductive layer to the connected wires and, due to the stepwise decrease in the diameter of the power spirals (strands) of the protector-retainer when switching to the wires to be connected, reliably keep the conductive layer from moving relative to the wires, which makes it possible to reduce the length of the spirals (strands) of the conductive layer, as well as to reduce the length of the power spirals (strands) of the protector-lock.

The technical result, due to the claimed design, is to save the metal of the power spirals (strands) of the protector-retainer and the spirals (strands) of the conductive layer by reducing their length and weight while maintaining all the necessary operational properties of the connecting clamp inherent in analogues known from the prior art. The design of the connecting clamp provides a smoother transition of the change in bending stiffness from the middle to the periphery, due to the transition of the power spirals (strands) of the protector-retainer from the conductive lay to the connected wires with a corresponding decrease in their inner diameter of the winding. This allows you to increase the service life of the claimed design of the clamp during operation when exposed to wind load.

The fact that the individual spirals of the conductive layer and/or protector-retainer can be assembled into strands and glued with the application of abrasive materials makes it possible to further reduce their length and material consumption, since such an embodiment further increases the friction force that occurs between the protector-retainer and the conductive lay, as well as between the wires and the conductive lay and / or protector-retainer. As a result, the reliability of the clamp operation during operation on overhead power lines is ensured and manufacturability is improved.

The invention is illustrated by the drawing, which shows a diagram of the spiral type connecting clamp.

In the drawing, the positions indicate:

1 and 2 - connected wires of the same diameter;

3 - lower conductive layer of spirals;

4 - upper conductive layer of spirals;

5 - connector;

6 - protector-lock.

The invention is a design of a connecting clamp, in which the protector-retainer is made of power spiral elements of a stepped type.

The connecting clamp for wires 1 and 2 of the same diameter consists of a connector 5, which is mounted on the cores of the connected wires 1 and 2. The connector 5 is made of strands of spirals made of high-strength steel wire. To improve the strength properties of the clamp, the strands of the connector 5 are glued with an abrasive, both on the inner and outer surfaces.

The clamp design includes one upper conductive lay of spirals (strands) 4 or two conductive lays of spirals (strands) mounted on top of connector 5, namely, the upper 3 conductive strand and the lower 4 conductive strand. Spirals (strands) of conductive layers, upper 3 and lower 4, are made of materials with low ohmic resistance.

The design of the connecting clamp also includes a protector-lock 6, made in the form of a stepped structure and consisting of several power spirals (strands). In its middle part, the power spirals of the protector-retainer 6 are mounted over the spirals of the conductive layer 3. The protector-retainer 6 extends beyond the conductive layer 3 and, with the end parts of its power spirals (strands), is mounted directly on the connected wires 1 and 2, and the transition from the conductive layer 3 on wires 1 and 2 is carried out in steps due to the difference in the diameters of the spirals of the conductive lay 3 and wires 1 and 2. At the end sections, the power spirals (strands) of the protector-retainer 6 are glued with abrasive.

The protector-retainer 6 creates the necessary forces of pressing the spirals of the conductive layers 3 and 4 to the wires 1 and 2 and to the connector 5, while the stepped transition of the end parts of the power spirals of the protector-retainer 6 from the conductive layer 3 to the wires gives the required strength properties of the entire structure of the connecting clamp .

The material consumption of such a design is much less compared to the designs known from the prior art.

Mounting of the connecting clamp is carried out in the following sequence. First, the ends of the conductive layers of the connected wires 1 and 2 are untwisted, thereby freeing the steel cores of the wires. Strands of connector 5 are successively wound onto the released cores of wires 1 and 2. Then, the previously untwisted wires of the lower layer of the connected ends of wires 1 and 2 are braided. 1 and 2. Spirals (strands) of the conductive layer 4 of the connecting clamp are wound over the connector 5, then over the spirals (strands) of the conductive layer 4 and over the braided layers of wires 1 and 2, spirals (strands) of the conductive layer 3 are wound, on which the power spirals (strands) of the protector-retainer 6, while at the ends the power spirals (strands) of the protector-retainer 6 go beyond the conductive layer 3 and with a stepped transition are mounted directly on the connected wires 1 and 2.

Claims (5)

1. A connecting clamp designed to connect two wires of the same cross section, containing a connector for the cores of the wires to be connected, formed by glued strands of spirals, at least one set of spirals of a conductive layer wound over the connector, and a set of power protector-retainer spirals wound on a conductive a winding, characterized in that the power spirals of the protector-retainer outside the conductive layer are wound with a transition directly to the wires to be connected, while the section of the power spirals of the protector-retainer is wound over the conductive layer, and the sections of the power spirals of the protector-retainer are wound directly onto the wires to be connected are made with different diameters. 2. The clamp according to claim 1, characterized in that the strands of the connector spirals are glued with an abrasive. 3. Clamp according to claim 2, characterized in that the strands of the connector spirals are glued with abrasive both from the inner and outer surfaces of the strands. 4. Clamp according to claim 1, characterized in that the spirals of the conductive layer are assembled into strands and glued with or without abrasive application. 5. Clip according to claim 1, characterized in that the power spirals of the protector-retainer are assembled into strands and glued with or without abrasive application.

Images