RU225804U1 - Shaped section for closing the transition zone through the inner corner of the wall of two straight sections of cable duct - Google Patents

Abstract

The utility model relates to electrical engineering. The technical result consists in increasing the reliability of fastening a thin-walled shaped section on straight boxes in the area of the inner corner of the walls. For this purpose, the shaped section for closing the transition zone through the inner corner of the wall of two straight sections of the cable duct contains two thin-walled parts made of polymer electrical insulating material. Each part is made in the form of a plate with edge sections bent transversely to the central part, which are made tapering from the bend zone to the free edge under a sharp corner. The central part is made arcuately concave and has a rounding on one edge, the shape of the outer surface of which on one part repeats the shape of the rounding on the inner surface of another part. On the free edge of the edge section in the zone of an acute angle in one part, holes are made, and on the free edge of the edge section in the zone of an acute angle in the other part there are cylindrical protrusions facing towards each other. A part with holes with a rounded part is inserted into the cavity of a part with protrusions from the side of its rounded part to allow angular displacement of the parts along the length of the rounded sections; the protrusions are inserted into these holes to allow rotation of one part relative to another around the common axis of the protrusions. The free edges of the bent parts are made arcuately bent in opposite directions, and trapezoidal-shaped hooks are made on the inner surface of the arcuately bent edges for connection with straight boxes. 4 ill.

Description

The utility model relates to electrical engineering and can be used as a product for laying cables and/or wires for various purposes in the open air, inside buildings and structures of energy and general industrial facilities to connect straight sections of a horizontal or vertical cable route when changing its direction at an angle of 90° in two directions.

In particular, the utility model relates to cable duct systems for electrical installations and concerns the design of a shaped polymer section for connecting at right angles two straight sections of the cable duct, which are laid in the inner corner of the wall.

Known cable ducts made of polymer material for electrical installations consist of a base and a cover. These boxes can be of the locking type, in which there are latches on the shelves of the lid and base, allowing them to form a locking connection with each other (RU 2231883, H02G 3/04, published on June 27, 2004), and of the lockless type, in which the lid is fixed on foundation with the help of additional products (“Electrical equipment, busbar ducts, electrical installation products, tools and mechanisms”, Directory, 5th edition, revised and expanded, M, “Information Research and Production Agency”, 2005., pp. 254-256). As an example, a straight lock-type box for laying wires and cables is known (RU 42134). It consists of a base and a lid, which has flattened elements on the shelves formed by edges that are bent in the opposite direction inside the cross section of the lid.

When installing sections of such a box, situations arise when the wires are redirected. For example, when the wires need to be laid in a direction perpendicular to the location of another straight box. This situation arises when it is necessary to go around the inner corner of connected walls. The junction of two straight boxes is closed by an external outlet - a shaped section with two entrance openings for boxes/sections. This shaped section, in fact, is an outer cover that covers the transition area of the boxes through the corner. The peculiarity of straight cable boxes is that they do not bend or bend. During installation, two fragments of a straight box are cut off and each fragment is fixed on one side of the wall with the end parts located as close to each other as possible. The corner area itself remains open. This area is covered with a removable cover, which has the ability to change its geometry for precise positioning on straight boxes if the right angle deviates from 90°.

A corner device for closing both external and internal corners is known, located at the junction of at least two differently directed boxes, containing two separate panels, one of which contains a protruding element, and the other contains a round hole into which said protruding element can fit rotation of said flaps around the Y axis, while on the round edge of said hole a local hole is made in the form of a straight slit, directed radially relative to the round edge of said hole and extending to the free edge of said flap, while the protruding element is made in the form of a cylindrical wall, the outer diameter of which is taking into account the gap is equal to the inner diameter of the round hole, so that when one flap is rotated relative to the other, the outer side of the said cylindrical wall slides along the edge of the round edge of the said hole, and the height of the cylindrical wall is variable along its circumference (RU 2471275, H02J 3/08, publ. 27/12/2012).

The known design is structurally complex, as it is designed to be built into straight boxes with its edge parts. This means that during installation, one straight box is first fixed, then this device is fixed on it, and then the end part of the second straight box is inserted into this device. But the wiring and layout of wires in straight boxes is carried out without covers and devices covering them. If you follow the technology of using a known device, it turns out that first you install one box and a device that covers the corner area, and then you need to try to stretch the wires through the closed corner section of the cable system. And only after that fix the second straight box. In this case, this second box must be installed so that the outermost part of the corner fixture fits into the box.

This creates certain difficulties in laying long wires.

A shaped section is known for covering the transition zone of the inner corner of a wall with two straight sections of a cable duct, containing two bases made of the same shape in the form of thin-walled plates, the ends of which are bent in one direction from the central part and installed transversely to this central part, with each base having the bent ends are made of two cylindrical protrusions located towards each other, both bases are located at angles to each other, the opening area between the bases is closed with a cover made in the form of a thin-walled plate, the ends of which are bent in one direction from its central part and installed transversely to this central part , two holes are made in the cover at each bent end, each of which is located opposite the corresponding hole at the other bent end, both bases cover the cover from the outside so that the protrusions of each base fit into the holes on the cover, which allows each base to unfold around the protrusions within cover width (see “Internal corners for In-Liner Front and In-Liner Aero DKS boxes”, posted in the offer for sale mode on the ABN website on the Internet at the address: hppts:// www.abn.ru/catalog/232411/) ( identified in March 2023, copy attached).

This solution was adopted as a prototype.

The disadvantage of this solution is the complexity of the design due to the need to use three parts and the complexity of assembling this shaped section. The assembly of the three parts itself consists of ensuring that the protrusions of the bases fit into the holes on the cover.

This section is held on straight boxes due to the fact that when putting the section on, the bent parts of the bases are pressed out, and after the lid has sat on the straight boxes, these parts are elastically pressed against the side walls of these boxes. Such fastening is not reliable, since over time the bent parts of the bases lose their elasticity. But the walls of the section are made thicker to retain their shape and their elasticity is much less than the elasticity of the thin side walls of straight boxes. Therefore, taking into account tolerances, a situation often arises when the section is not pressed tightly against the walls of the boxes. In this regard, one side wall of the straight box is made with grooves along the edges into which an additional arc-shaped convex plate is inserted. When putting on a section, the installer presses the section against the boxes from below, creating a gap between the other side wall of the straight box and the bent part of the shaped section. And then he inserts the plate into this gap. The plate is deformed in the convex area and then straightens, pressing the bent parts of the shaped section towards the side walls of the straight boxes. This complicates the design of the straight boxes themselves and increases the range of parts. Like any polymer, over time, due to exposure to ultraviolet radiation and heat, it loses its elasticity and becomes brittle. Therefore, such fastening of the shaped section on straight boxes is short-lived and unreliable.

This utility model is aimed at achieving a technical result, which consists in increasing the reliability of fastening a thin-walled shaped section on straight boxes in the area of the inner corner of the walls.

The specified technical result is achieved by the fact that a shaped section for closing the transition zone through the inner corner of the wall of two straight sections of the cable duct, characterized in that it contains two parts made of thin-walled polymer electrical insulating material and each of which is made in the form of a plate with a central part bent transversely edge sections, which are made tapering from the bend zone to the free edge at an acute angle, the central part is made arcuately concave and has a rounding at one edge, the shape of the outer surface of which on one part repeats the shape of the rounding on the inner surface of another part, on the free edge of the edge section in in the zone of an acute angle, holes are made in one part, and on the free edge of the edge section in the zone of an acute corner in the other part, cylindrical protrusions are made facing towards each other, while the part with the holes with the rounded part is inserted into the cavity of the part with the protrusions from the side of its rounded part to allow angular displacement of the parts along the length of the rounded sections, the protrusions are inserted into these holes to allow rotation of one part relative to the other around the common axis of the protrusions, and the free edges of the bent parts are made arcuately bent in opposite directions and trapezoidal-shaped hooks are made on the inner surface of the arcuately bent edges for connections with straight boxes.

These features are interrelated and are essential to form a stable set of essential features sufficient to obtain the required technical result.

This utility model is illustrated by a specific example of execution, which, however, is not the only possible one, but clearly demonstrates the possibility of achieving the required technical result.

In fig. 1 - general view of the shaped section from above;

fig. 2 - side view of the shaped section;

fig. 3 - the same as in Fig. 2, axonometric view;

fig. 4 - view of the part with protrusions.

According to this utility model, the design of a thin-walled shaped section made of polymer electrical insulating material is considered, which is used to close the transition zone of two straight sections of the cable duct enveloping the inner corner of the wall.

Quite often, the internal corner of a wall, considered as a right angle, in reality has deviations from the geometric right angle. In this regard, the use of known sections, molded at right angles and not having adjustment of the position of one part relative to another, does not allow correctly closing the laid out straight boxes on the surfaces of different walls in the corner area. The solution to this problem is to provide the possibility of angular adjustment of the position of one part of the section relative to the other in order to compensate for the discrepancy between the angle of the joined walls and the right angle.

The shaped section according to the present utility model is made of thin-walled polymer material (preferably acrylonitrile-butadiene-styrene copolymer, known on the market as ABC plastic, characterized by high impact resistance and good electrical insulating properties) and consists of two parts 1 and 2.

Each of these two parts is made in the form of a plate with edge sections 4 bent transversely from the central part 3, which are made tapering from the bend zone to the free edge 5 at an acute angle and have the shape of a triangle in plan.

The central part 3 is made arcuately concave and has a rounding 6 on one edge, the shape of the outer surface of which on one part repeats the shape of the rounding on the inner surface of the other part. One part 1 with its rounded part is inserted into the cavity of another part 2 from the side of its rounded part. In the initial state, the parts are located at an angle of 90° to each other (Fig. 1). The curves on the central parts 3 allow the parts to move along the rounded surfaces and slide across them (Figs. 1 and 2). This design of parts allows for angular displacement of parts in the range from 80° to 100°. Thanks to this design, one part has the ability to move angularly relative to the one mounted on a straight frame in the range of ±10° from the right angle. Angular adjustment of the shaped section allows you to compensate for the deviation from perpendicularity of the internal angle formed at the junction of the walls on which straight sections of cable ducts are installed.

On the free edge of the edge section in the zone of an acute angle in one part 1 there are holes 8, and on the free edge of the edge section in the zone of an acute corner in another part 2 there are cylindrical protrusions 9 facing towards each other. In the assembly, a part with holes with a rounded part is inserted into the cavity of a part with protrusions from the side of its rounded part to allow angular displacement of the parts along the length of the rounded sections, and protrusions 9 are inserted into these holes 8 to allow rotation of one part relative to another around the common axis of the protrusions.

When installing on straight boxes fixed to the walls in the corner area, each part is placed on top of its own box. The position of the parts along the inner corner of the wall is adjusted autonomously without the participation of the installer due to the fact that one part slides over the other. A straight box along its length in the area of the bottom wall has a recess on the outside like an open groove. And the parts on the free edges of the bent parts on their inner side have hooks 10 of a trapezoidal shape. When landing, the part is placed on top of the box, the edge sections 4, like walls, are bent, the hooks slide along the side walls of the box and fall into the recesses of the box in the area of its bottom. Parts 1 and 2 snap onto straight boxes. The moment of bending of the edge sections with hooks (when sliding along the walls of the box) leads to deformation of the part in the bend zone of these sections from the central part, which can lead to breakage of the thin-walled structure. To eliminate this phenomenon, the free edges 5 of the end edge sections 4 are made arcuately bent (item 11) in opposite directions. And the hooks 10 are made on the inner surface of the arched edges. When putting on the parts, the hooks push the edge sections 4 apart. In this case, the deformation of the sections 4 in the area of the bent edges (item 11) is greater than the deformation of these sections in the zone of their inflection from the central part, that is, the inflection zone of the sections 4 is unloaded, as a weak point in the structure .

This utility model is industrially applicable. Allows you to increase the operational strength of a shaped thin-walled section while simplifying the design and ensure reliable fixation of the section on straight boxes.

Claims (1)

A shaped section for closing the transition zone through the inner corner of the wall of two straight sections of a cable duct, characterized in that it contains two parts made of thin-walled polymer electrical insulating material and each of which is made in the form of a plate with edge sections bent transversely from the central part, which are made tapering from the bend zone to the free edge at an acute angle, the central part is made arcuately concave and has a rounding on one edge, the shape of the outer surface of which on one part repeats the shape of the rounding on the inner surface of another part, on the free edge of the edge section in the acute angle zone in one part holes are made, and on the free edge of the edge section in the zone of an acute angle in the other part there are cylindrical protrusions facing towards each other, while the part with the holes with the rounded part is inserted into the cavity of the part with protrusions from the side of its rounded part to allow angular displacement of the parts along the length of the rounded sections, the protrusions are inserted into these holes to allow rotation of one part relative to the other around the common axis of the protrusions, and the free edges of the bent parts are made arcuately bent in opposite directions, and trapezoidal-shaped hooks are made on the inner surface of the arcuately bent edges for connection with straight boxes.