RU2284619C1 - Vibration damper clamp - Google Patents

Abstract

FIELD: power engineering; vibration damper clamps for conductors and ground wires of overhead power transmission lines.

SUBSTANCE: proposed clamp has body and die bolted together, conductor or ground wire being secured in their troughs as they are bolted. Inner surface of body trough is of variable curvature and different radii R1, R2, R3. Centers of these radii are disposed on horizontal axis of conductor and spaced apart through rated distance from vertical axis 16 of clamp; radii are found from following equations: R1 = (0.44-0.49)d_w.min.; R2 = (0.5-0.53)d_w.max.; R3 = (0.515)-0.575)d_w.min., where d_w.min. is minimal diameter of conductor or ground wire that can be secured by clamp; d_w.max. is maximal diameter of conductor or ground wire that can be secured by clamp. Body may have hexahedral slot with clamping device bolt nut fixed flush with external surface of bolt.

EFFECT: ability of unifying vibration damper manufacturing process and reducing number of their type varieties.

3 cl, 2 dwg

Description

The invention relates to the electric power industry, in particular to vibration dampers that are installed using special clamps on the wires and cables of overhead power lines to prevent damage from fatigue stresses caused by vibrational vibrations.

A known clamp for attaching a vibration damper to the wires and cables of overhead power lines, made in the form of a housing, a die and a threaded bolt, with which a wire or cable of an overhead power line is attached to their grooves [1].

The design, and specifically the curvature of the body chute, of this known clamp is such that the vibration damper with it can only be mounted on a limited group of overhead line wires; at the same time, the range of wires and cables used on overhead power lines is very wide: from minimum diameters to maximum diameters and cross sections (heavy wires). That is, vibration dampers with clamps of a known type will have a significantly limited range of applications.

The closest technical solution in relation to the proposed solution is a clamp for fixing the vibration damper on the wires and cables of overhead power lines, comprising a housing made in the form of a profile having a groove at one end and an opening for securing an elastic damper element with loads on the other end a damper, a die with a reciprocal groove, and a clamping device that fastens the housing with a die in such a way that a wire or cable of the line is fixed in their grooves [2].

This clamp is characterized by almost the same disadvantages as the disadvantages of the above-mentioned known technical solutions. In the dampers of this type, the clamps cannot provide the standard value of the termination strength at the same time, both for the group of wires of minimum diameters and for the group of wires of maximum diameters, that is, these vibration dampers are suitable for practical use only for some types of wires and cables of overhead lines power transmission.

The applicant set himself the task of creating a vibration damper design suitable for use on overhead power lines with virtually all the dimensions of wires and cables in operation. The authors achieve the latter due to the design of the damper clamp having the inner surface of the groove of the housing of variable curvature. A positive result from the use of the proposed technical solution lies in the development of a vibration damper, characterized by versatility, the ability to mount it on wires and cables with a wide range of their technical characteristics. This result has become achievable due to a new set of essential structural features of the claimed technical solution, which is given in the next edition of the claims, namely: "a clip for fixing the vibration damper on the wires and cables of overhead power lines, containing a housing made in the form of a profile having one end of the groove, and the other a hole for securing an elastic damper element therein with damper weights, a ram with a reciprocal groove, and a clamping device securing the housing to the ram minutes so that their trenches fixed wire and cable lines, the inner surface of the trough housing is provided with a variable curvature, at least three radii R _1, R _2, R _3, the centers of which lie on the horizontal axis of the wire and cable, wherein trough bottom hull formed radius R _1, spaced from the central vertical axis of the clamp a distance a = (0,48 ÷ 0,55) · d _pr.maks., the center of radius R ₂ spaced from the central vertical axis of the clamp away from the trough bottom case at a distance of A ₂ = 0.5 ÷ 2 mm, the center of radius R ₃ lies at a distance of A ₃ from the bottom casing groove, determined from the expression: A ₃ = (1.10 ÷ 1.3) · A, the curves formed by the indicated radii are connected by straight line segments, and the values of these radii are selected in the following limits: R ₁ = (0.44 ÷ 0.49) d _d.min. , R ₂ = (0.5 ÷ 0.53) d _{max max.} , R ₃ = (0.515 ÷ 0.575) d _{max max.} , where d _approx . min - the minimum value of the diameter of the wire and cable at which they can be mounted in the clamp, d _{approx. max.} - the maximum value of the diameter of the wire and cable at which they can be mounted in the clamp, A is the distance from the Central vertical axis of the clamp to the bottom of the groove of the housing, measured along the horizontal axis of the wire and cable; the center of radius R ₃ is separated from the center of radius R ₂ away from the bottom of the groove of the housing at a distance of 0.5 to 2.5 mm; the housing is made with a hexagonal groove in which the nut of the bolt of the coupling device is rigidly fixed to the outer surface of the housing.

The invention is illustrated by drawings, where Fig.1 is a General view of a clip for attaching a vibration damper, made according to the present invention; figure 2 - schematically shows the location in the groove of the clamp housing in figure 1 as the wire of the minimum diameter, and the wire of maximum diameter.

The inventive clamp for fixing the vibration damper on the wires or cables of overhead power lines is made in the form of a die 1 and a housing 2, fastened together by a bolt 3 (for example, threaded, for which a thread is also provided in the housing), the longitudinal axis 4 of which is inclined with respect to horizontally. Alternatively, the housing 2 of the clamp can be made with a groove 5 of a hexagonal shape, in which the nut 6 is rigidly pressed in flush with the outer surface of the housing 2 under the bolt 3 of the coupling device. The housing 2 and the die 1 are standard profiles in which grooves 7, 8, 9 are made; an opening 10 is also provided in the housing 2, into which an elastic damper element with loads (not shown) of a vibration damper is inserted and fixed. On the inner surface of the grooves 7, 8, 9, notches can be applied to ensure better fastening of the clamp on the wire (cable). In addition, the die 1 can be deployed around the bolt 3 and in this case, the clamping of the wire (cable) is carried out between the grooves 7 and 9.

The main feature of the proposed clamp is the original embodiment of the groove 7 of the housing 2. The inner surface of the groove 7 of the housing 2 of the clamp has a variable curvature. From one end to the other end, the inner surface of the gutter 7 has three sections 11, 12, 13 of different curvature, interconnected by straight segments of lines 14 and performed by three different radii: R ₁ , R ₂ , R ₃ . The centers of each of these radii lie on the horizontal axis 15 (actually the horizontal axis of the wire or cable located in the groove 7 of the housing 2). Section (bottom) 11 of the gutter 7 is made of radius R ₁ and is spaced from the central vertical axis 16 of the clamp passing through the center of the hole 10 by a value A determined from the expression A = (0.48 ÷ 0.55) · d _pr.max. ; the center of radius R ₁ is located at a distance A ₁ from axis 16 toward the bottom 11 of the groove 7 of the housing 2 along the horizontal axis 15. Section 12 of the groove 7 is made with a radius R ₂ , the center of which lies on the horizontal axis 15 of the wire (cable) and is spaced from the Central vertical axis 16 of the clamp by a value of A ₂ = 0.5 ÷ 2 mm Section 13 of the gutter 7 is performed by a radius R ₃ , the center of which lies at a distance of A ₃ from the bottom 11 of the gutter 7, determined from the expression: A ₃ = (1.10 ÷ 1.3) · A, where A is the distance from the central vertical axis 16 clamp to the bottom 11 of the groove 7, measured along the horizontal axis 15. Or, as an option, the center of the radius R ₃ can lie at a distance of 0.5 ÷ 2.5 mm from the center of the radius R ₂ to the side from the bottom 11 of the groove 7 of the housing 2. Values radii R ₁ , R ₂ , R _{3 are} determined depending on the minimum and maximum values of the diameter of the wires (cables), the most common standard sizes for significant overhead power lines. These values are as follows: R ₁ = (0.44 ÷ 0.49) · d _av.min. , R ₂ = (0.5 ÷ 0.53) d _{max max.} , R ₃ = (0.515 ÷ 0.575) d _{max max.} Here d _pr.min. - the minimum value of the diameter of the wire and cable at which they can be mounted in the clamp, d _pr.max. - the maximum value of the diameter of the wire and cable 16, 17, at which they can be mounted in the clamp (see figure 2).

The proposed clamp is assembled and mounted on a wire (cable) line as follows.

The housing 2 of the clamp with the chute 7 is brought into the wire 18, then the die 1 is applied from below the wire, a bolt 3 is inserted into it and the bolt 3 is tightened in the nut 6 with a key with the force and tightening torque, which provide the estimated tightness of the wire 18 in the clamp.

The new design of the clamp for fixing the vibration damper due to the original form of the inner surface of the body trough, (for example, having three curved sections with radii of different sizes connected by straight sections), allows you to develop a vibration damper, characterized by a high degree of unification and versatility, which does not require significant costs for installation on lines with wires and cables of various technical characteristics. Vibration dampers with such clamps can actually cover almost the entire range of wires and cables used on overhead power lines, namely, from small diameters to large diameters and cross sections. In addition, the production technology of this clamp is simple and does not require significant costs, since the case and the clamp die are made of standard profiles through a single cutting operation.

CJSC "MZVA" conducts full-scale tests of new designs of clamps for fixing vibration dampers with a view to their further mass production.

Information sources

1. European patent No. 0159536A2, class. H 02 G 7/14, publ. 04/21/1986

2. Catalog "Insulators of overhead power transmission lines and open switchgears", Vneshtorgizdat, Ed. No. 56006E, 1976, fig. 146, p. 155.

Claims (3)

1. A clip for fixing a vibration damper on wires and cables of overhead power transmission lines, comprising a housing made in the form of a profile having a groove at one end and a hole for securing an elastic damper element with damper weights in it, a die with a response groove and a coupling a device that fastens the housing with a die in such a way that a wire and a line cable are fixed in their grooves, characterized in that the inner surface of the body groove is made with variable curvature by at least three radii R1, R2, R3, the centers of which lie on the horizontal axis of the wire and cable, while the bottom of the body groove, made with a radius R1, is a distance from the central vertical axis of the clamp A = (0.48 ÷ 0.55) · d _pr.max. ; the center of radius R2 is spaced from the central vertical axis of the clamp away from the bottom of the body trough at a distance of A2 = 0.5 ÷ 2 mm, the center of radius R3 lies at a distance of A3 from the bottom of the body trough, determined from the expression: A3 = (1.10 ÷ 1 , 3) · A, the curves formed by the indicated radii are connected by straight line segments, and the values of these radii are selected in the following limits: R1 = (0.44 ÷ 0.49) · d _av.min. , R3 = (0.5 ÷ 0.53) d _{max max.} , R3 = (0.515 ÷ 0.575) d _{max max.} where d _{pr min.} - the minimum value of the diameter of the wire and cable at which they can be mounted in the clamp, d _pr.max. - the maximum value of the diameter of the wire and cable at which they can be mounted in the clamp, A is the distance from the Central vertical axis of the clamp to the bottom of the groove of the housing, measured along the horizontal axis of the wire and cable. 2. The clamp according to claim 1, characterized in that the center of radius R ₃ is spaced from the center of radius R ₂ away from the bottom of the groove of the housing at a distance of 0.5 to 2.5 mm. 3. The clamp according to claim 1, characterized in that the housing is made with a hexagonal groove in which the nut of the bolt of the clamping device is rigidly fixed to the outer surface of the housing.

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