RU2380583C2 - Cylindrical elements connecting device - Google Patents

Abstract

FIELD: engineering industry.

SUBSTANCE: device for connecting cylindrical elements includes hollow cylindrical housing made in the form of clamp with longitudinal slots, on which there arranged are washers made from material with "ЭПФ". Washers have the shape providing their mutual centering on clamp at mutual contact of their adjoining surfaces.

EFFECT: high use factor of material, low labour input during manufacture of the device and low prime cost of the device.

7 cl, 7 dwg

Description

The invention relates to mechanical engineering and energy and can be used in connections of various mechanical, hydraulic and pneumatic systems of various units, as well as flexible elements in the form of cables, cables, etc., including from dissimilar materials.

The prior art device for the one-piece connection of cylindrical parts using a cylindrical body with a through hole made in the form of a sleeve made of a material having an EPF (shape memory effect), while the ends of the connected parts are made in the cross section of an ellipsoidal shape, and the axis of the ellipses in the connection plane parts are shifted one relative to another by 3-90 ° (SU 1082993 A, publ. 03/30/1984).

A disadvantage of the known device is its high cost due to the manufacture of the housing from a material with an electron-phase transition, low material utilization, high laboriousness in the manufacture of the device.

Closest to the proposed is a device for connecting cylindrical elements, which contains a hollow cylindrical body made in the form of a collet with longitudinal slots, on which washers made of material with EPF are placed, and spacer rings are located between the washers, while the washers have flat surfaces, contacting with dividing rings (US 6269883 B1, publ. 7.08.2001).

The device is designed to connect cylindrical elements of different diameters, while an element of a larger diameter is inserted into the gap between the collet and an element of a smaller diameter, and when crimping the collet with washers with an EPF, an element of a larger diameter tightly compresses the element of a smaller diameter.

For reliable connection of cylindrical elements of the same butt diameter, a larger number of washers located through the spacer rings are required, therefore, an increase in the length of the device.

An object of the invention is the creation of a technological device for connecting elements that provides high reliability of the connection of axisymmetric elements end-to-end without increasing the overall dimensions of the device.

The problem is solved in that in a device for connecting cylindrical elements containing a hollow cylindrical body, made in the form of a collet with longitudinal slots, on which washers made of material with EPF are placed, according to the invention, the washers have a shape that ensures their mutual alignment on the collet with mutual contacting their adjacent surfaces.

Placing washers tightly in contact with each other on collets with longitudinal slits made of a material with EPF ensures the achievement of a technical result, which consists in ensuring high reliability of the connection of axisymmetric butt joints with a short device length.

In particular embodiments of the invention, to ensure sealing of the slots from opposite ends, they are made non-overlapping in length, i.e. short, and on the inner surface of the collet in the area of the slots are made locking protrusions that improve fixation, and between the slots - sealing ring protrusions that improve sealing.

In the case when sealing is not required and to expand technological capabilities, increase the memory capacity of connecting devices and provide a large stroke during compression of flexible elements, for example, compression of a flexible sleeve, slots from opposite ends are made overlapping in length, i.e. long, and the washers are made with radial slots.

To ensure the connection of high voltage wires of power lines inside the collet from a material with high electrical conductivity connecting the conductive parts, for example, an aluminum braid, a sleeve of high-strength material, for example, steel, can be installed, which provides the connection of a supporting core (cable) made, for example, of become.

The adjacent surfaces of the washers in contact with each other can be made respectively convex and concave in the form of a stepped shape to ensure their centering.

To ensure a high coefficient of material utilization, the washers can be made of semi-finished sheet products.

The invention is illustrated by drawings.

Figure 1 (a, b) shows the proposed device assembly for connecting elements where tightness of the connection is required, two types.

Figure 2 shows a half section of the washer.

Figure 3 (a-c) shows the collet of figure 1, three types.

Figure 4 (a, b) shows the proposed device assembly for connecting elements where the tightness of the connection is not required, two types.

Figure 5 (a, b) shows the collet of figure 3, two types.

Figure 6 shows the washer with transverse slots, two types.

Figure 7 shows the washer of figure 6 in a deformed and restored state.

The device comprises a collet 1 with slots 2 that do not overlap along the length and washers 3 placed on the collet, having a convex-concave shape of adjacent surfaces or a stepped shape, which ensures their mutual centering on the collet 1, and made of semi-finished products (see figure 1). The washer 3 of the material with EPF in the manufacture of has an inner diameter less than the outer diameter of the collet 1. To ensure sealing of the collet 1 (see figure 3) is made with sealing ring protrusions 4, which are pre-machined on the inner surface of the collet 1 in its area between the slots. On the inner surface of the collet 1 at its edge sections in the area of the slots to improve fixation perform locking protrusions 5.

In the case when sealing is not required and a large stroke is required when compressing flexible elements, for example, compressing a flexible sleeve, the collet 1 is made with slots 2 overlapping along the length, and the washers 3 are made with radial slots 6 (see Fig. 4).

The structural memory of the washers 3 with radial slots 6 (see Fig.6) significantly exceeds the memory of the material and is made in such a way that the ratio of the thickness S to the width h and the depth L of its slots is fulfilled from the condition of equal strength in bending.

Figure 7 shows the washers with radial slots 6 in the deformed (3b) and restored (3a) states.

To connect high voltage wires of power lines inside the collet 1 from a material with high electrical conductivity connecting the conductive parts, for example, an aluminum braid, a sleeve 7 (see Fig. 5) of high strength material, for example, steel, connecting a steel core (cable) is installed ) (not shown).

The assembly of the device is as follows.

On the collet 1 washers 3 are installed (see figure 1). When installing, the washers 3 are deformed in the radial direction at a temperature below the temperature of restoration of the form. The washers 3 are centered due to the mutual contact of their convex-concave or stepped surfaces and are fixed by a ring (not shown). The assembled device is installed with some clearance on axisymmetric elements, for example, on the end sections of the pipes, and the device is heated above the transformation temperature of the material of the washers 3. The washers 3 restore their original shape, and due to the arising thermomechanical stresses, the collet 1 and the end sections of the pipes are deformed as a result of which a strong and tight connection is formed. The centering of the washers when they are in mutual contact ensures their accurate installation on the collet without offsetting from the axis, which ensures their tight contact with the collet and reliable compression of the collet along the entire length.

The invention provides a high coefficient of material use, low laboriousness in the manufacture of the device, and low cost of the device.

Claims (7)

1. A device for connecting cylindrical elements, comprising a hollow cylindrical body made in the form of a collet with longitudinal slots, on which washers made of a material with EPF (shape memory effect) are placed, characterized in that the washers have a shape that ensures their mutual centering on collet when mutually contacting their adjacent surfaces. 2. The device according to claim 1, characterized in that the slots from opposite ends are made non-overlapping in length, and on the inner surface of the collet in the area of the slots are made locking protrusions, and between the slots - sealing ring protrusions. 3. The device according to claim 1, characterized in that the slots from opposite ends are overlapping in length, and the washers are made with radial slots. 4. The device according to claim 3, characterized in that a sleeve of high strength material is installed inside the collet, and the collet is made of a material with high electrical conductivity. 5. The device according to claim 1, characterized in that the adjacent surfaces of the washers are respectively convex and concave in shape. 6. The device according to claim 1, characterized in that the adjacent surfaces of the washers are made in a stepped form. 7. The device according to claim 1, characterized in that the washers are made from sheet semi-finished products.

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