RU2303847C1 - Ear for connecting insulators and other components of insulating suspensions for overhead power transmission lines - Google Patents

Abstract

FIELD: power engineering; insulating hardware for overhead power transmission lines.

SUBSTANCE: proposed ear is essentially cylindrical body with two flat end surfaces and one lateral vertical plane beveled on its ends. Surfaces bear identical seats 5, 6 of hinged spherical joints which are mirror images of one another. Seats 5, 6 are of standard size and receive suspension insulator pins 7, 10. Newly introduced are also spring-loaded locks 9, 12. Ear can be provided with barrier 13 between seats 5, 6 or such barrier may be dispensed with in which case one spring-loaded lock 14 is used. Clearances B between locks 9, 12 and pins 7, 10 measure about 1.5 to 3 mm.

EFFECT: reduced labor consumption, enhanced degree of unification, enlarged range of insulator and hardware breaking loads.

3 cl, 3 dwg

Description

The invention relates to the field of electric power and, in particular, to couplers (ears) designed to connect insulators, for example, polymer and other elements of insulating suspensions of overhead power lines.

The insulators from which the insulating pendants of overhead power lines are assembled are equipped with various types of terminators: with a pivot of a spherical joint, a socket of a spherical joint and eyelets (one-legged and two-legged). The method of their manufacture, as well as the complexity and intensity are different; Thus, the ends of insulators with a socket of a spherical joint are made of steel or malleable cast iron only by casting, joints with one-footed or two-footed eyes are forged (stamped) or, if necessary, machined, and finally, the ends with a head of a spherical joint are also forged ( stamping) or machining. In most cases, the manufacture of terminators is carried out by machining due to the lack of foundry and stamping equipment, and then the option of manufacturing insulators with a pestle of a spherical joint is most preferable, since when machining it is much less metal waste, less time to manufacture, and also less metal consumption and laboriousness in manufacturing. In addition, this allows to reduce the types of insulators by type of connection, which in turn reduces the complexity of manufacturing, simplifies the assembly of insulator strings and, accordingly, their cost.

Known insulating suspension for securing the wires of overhead power lines, in which to connect the insulators to each other in the garlands is used, for example, a mounting eye made in the form of a housing with a spherical socket under the pestle of the insulator rod and a single-foot eye for attaching using an earring with a cap of another insulator in an insulating suspension [1].

This technical solution uses two different types of connecting elements for insulators of insulating suspensions, namely: with a socket of a spherical connection and with eyes, which leads to the need to use additional fittings when assembling insulators and, ultimately, to a significant increase in the material consumption of the product and the increase in the complexity of manufacturing; the use of an eye of this design for the assembly of insulating suspensions, recruited, for example, from polymer insulators, is practically difficult due to the high cost of their production.

The closest technical solution in relation to the proposed one is an eyelet for connecting insulators and other elements of insulating suspensions of overhead power lines, having a pivot-spherical socket on one side, designed to connect the pivot-spherical joint of the insulator through its cavity, and on its opposite side - swivel designed to connect with linear fittings such as earrings [2].

And for this version of the eyelet design, the most preferred part of labor costs during manufacturing (due to the use of machining technology) are end fittings with a pestle of articulated spherical connection, since then insulators with such end fittings will in turn have a high degree of unification due to the reduced number of sizes and low labor input in manufacturing. However, insulators equipped with ears of this known design have connecting elements made as an “ear-eye”, that is, they are characterized by greater metal consumption and laboriousness in manufacturing, and also do not meet the requirements of unification (a large number of sizes).

The applicant set the task to produce new, more advanced designs of linear reinforcement, in particular ears for connecting insulators having terminators with a pestle of articulated spherical connection. The solution to this problem allows us to simplify a fully insulating suspension, reduce its construction height and reduce metal consumption; it is very important that it is possible to use one type of insulator (with a terminal in the form of a pestle of a spherical joint) as less labor-intensive in manufacturing and to reduce the number of standard sizes of insulators in the insulating suspensions of overhead power lines. This positive technical result was achieved due to a new set of essential structural features of the invention, which is fixed in the following formula: "an eye for connecting insulators and other elements of insulating suspensions of overhead power lines, having on one side a hinged-spherical socket designed to connect through its cavity with a pestle of a swivel-spherical connection of the insulator, and on its opposite side - a swivel connection designed to connect with linear armature of the type of earring; the eye is made in the case with flat end surfaces and at least one side surface in the form of a vertical plane with bevels at its ends, on both end surfaces are made the same size of the socket of spherical joints with a depth of their cavity, allowing insert into each of them a pestle of the insulator rod and at least one lock, while a partition is located between the nests, the construction height of the eyelet is chosen equal to the distance H between the spheres eskimi portions of said receptacles; moreover, the gap between the end of the pestle and the plane of the castle is within 0.5 ÷ 10 mm; the eye is made without a partition between both hinge-spherical nests, and the distance from the lock plane to the end of the pestle of the insulator rod or earring B ₁ is selected in the range (0.45 ÷ 0.9) B, where B is the gap between the end of the pestle and the lock plane ; each of the articulated-spherical nests is made with dimensions corresponding to a number of breaking loads to exclude transition links when connecting the eyelet with linear reinforcement.

The invention is illustrated by drawings, where in Fig.1 is a General view of the eyelet for connecting insulators and other elements of insulating suspensions of overhead power lines made according to the present invention, a view with spherical-articulated joints; figure 2 is the same as in figure 1, an embodiment of the eyelet according to the second dependent claim; figure 3 is the same as in figure 1, a perspective view of the actual body of the eyelet.

The proposed ear belongs to the class of linear coupling fittings used on overhead power lines of both low and high voltage. Ears are an intermediate connecting element between insulators of insulating suspensions. The claimed ear is a cylindrical body (housing) 1, which has two end flat surfaces 2 and 3, and one of the side surfaces 4 is also cut off in a vertical plane, if we consider the mounting position of the eye on the line. On the planes 2, 3, the nests of articulated spherical joints 5, 6, which are actually mirror images of one another, are made absolutely identical in their overall dimensions. A pestle 7 is inserted into the cavity of the socket 5, for example, CP and CPC earrings or an insulator with a hinged-spherical head 8, locked with a spring lock 9 to prevent disengagement from the insulator rod (not shown). A pestle 10 of another insulator with a hinged-spherical head 11 and its own spring lock 12 is respectively introduced into the cavity of the second socket 6. A partition 13 (flat plate) with a thickness of 3 mm or more is made between the sockets 5, 6. Sockets of articulated spherical joints 5, 6 are standard elements of the coupling fittings widely used in the electric power industry. The gaps B between the plane of each spring lock 9, 12 and the ends of the pestles 7, 10 introduced into the nests 5, 6 in the joints of various breaking loads are about 1.5–3 mm, and the building height H of the eye is equal to the distance between the spherical parts of the nests 4, 5 .

Alternatively, the eyelet can be made without a partition 13 between the sockets of the hinged-spherical joints 5, 6 and with one spring lock 14 (see figure 2). In this embodiment of the eyelet, the distance B ₁ from the plane of the spring lock 14 to the ends of the pistils 15 of the earrings 16 is selected, for example, in the range: B ₁ = (0.45 ÷ 0.5) V.

To reduce the material consumption of the eye, its lateral surface (plane) 4 can be made with bevels 17 at its ends.

In order to exclude from practical use when making connections of insulating suspensions and linear reinforcement with different rows of breaking loads, the adapter links of the socket of articulated spherical joints 4, 5 are made with the dimensions of the corresponding series of breaking loads.

Ears of this design with two identical mirrored nests of articulated spherical joints have the following significant advantages compared to known ears of a similar purpose:

- the identity of the connection of the eyelet on the one hand with the hinge-spherical head of the insulating suspension insulator rod, and on the other hand for connecting also through just such a hinged-spherical assembly with the pestle of the earring for attaching the insulating suspension to the attachment unit of the line support; this allows to achieve a high degree of unification of the design of insulators and, therefore, to reduce the number of their sizes;

- the claimed ears can be made with sockets of various connection rows according to mechanical loads, which makes it possible to equip insulating pendants with insulators and linear reinforcement of various rows of destructive loads;

- low complexity of manufacturing and the cost of their production.

CJSC "MZVA" tested the proposed designs of the ears and is preparing their serial production.

Information sources

[1] Copyright certificate (Russian patent) No. 1778849, class H02G 7/20 dated 06/14/90, published on 11/30/92. Bull. No. 44.

[2] "Directory of the construction and reconstruction of power lines with voltage of 0.4-500 kV." Edited by E.G. Gologorsky, Moscow, Publishing House NTs ENAS, 2003, pp. 72-75, Fig. 1.9-1.10.

Claims (3)

1. An ear for connecting insulators of insulating suspensions of overhead power lines, having a pivot-spherical socket on one side, designed to connect a pivot-spherical joint of the insulator through its cavity, and on its opposite side, a pivot joint, designed to connect to the earring, characterized in that the eye is made in the form of a housing with flat end surfaces and at least one side surface in the form of a vertical plane with bevels at its ends, on both The end surfaces of the spherical joints are made of the same size with the depth of their cavity, which allows you to enter into each of them a pestle of the insulator rod and at least one lock, and the size of the eyelet along its height is chosen equal to the distance H between the spherical parts of these nests , and the gap between the end of the pestle and the plane of the castle is within 0.5 ÷ 10 mm 2. The eyelet according to claim 1, characterized in that it is provided with a partition made in the form of a flat plate and located between these nests of articulated spherical joints. 3. The eyelet according to claim 1, characterized in that the distance from the plane of the lock to the end of the pestle of the rod of the insulator or earring B ₁ is selected in the range (0.45 ÷ 0.9) B, where B is the gap between the end of the pestle and the plane of the lock .

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