SU1052773A1 - Water hammer damping device - Google Patents

Abstract

I..Device for absorbing a shock strike, containing a section of a thin-walled pipe with a non-circular cross-sectional shape, characterized in that, in order to increase the efficiency of hydraulic shock damping during repeated use, an elastic and rigid ring matched between each other and equidistant cylindrical m with a similar pipe with a cross-sectional shape, and the elastic ring is rigidly connected to the pipe and is made with a variable wall thickness and two axes of different size etrii I cross section, wherein bol- il sha axis of this sub-section is routed greater angle to the pipe section axis. J / if

Description

-and

Phi. /

21 The device according to claim 1, 1 and 2, which is due to the fact that the thickness of the elastic ring with a larger basis of symmetry is made greater. The thickness of the ring along the minor axis

3, The apparatus according to claim 1, 1, 1, 2, 2, 2, 2, 1, 2, 2) between rolling and rigid rings,

4. The device according to p. I5 about t l ich and Y. e is that the return spring is installed between the rigid ring and the pipe.

Discretion refers to devices for quenching energy, noise, water hammering and can be used in all parts of the national economy associated with unsteady fluid flow. A device is known for damping fluctuations in the pressure of a liquid, made in the form of internal shells installed in a housing filled with compressed gas with a cross-section of a non-circular planar shape rp. The device is not sufficiently reliable because of the possibility of leakage of compressed gas for. A device for damping pressure fluctuations is known, including its damp. The shape of a cross-sectional chamber, an ellipse of 2J. The disadvantage of this device is that it cannot be used when working with large pressures because of the compliance of the wall to its damper. : The closest to the predictable technical essence and the achieved result is a device for damping hydraulic shock. containing a thin-walled pipe with non-circular cross-sectional shape C ,. However, the known device is ha; Characterized by non-effective hydraulic shock absorbing efficiency. With multiple use. The purpose of the invention is to improve the efficiency of hydraulic shock absorbing when reusable. This objective is achieved by providing an elastic and rigid ring fitted to a thin-walled pipe with a non-circular cross-sectional shape, 4fa pipe, coupled to each other along an equidistant cylindrical surface. with a similar pipe with a cross-sectional shape, and the outer ring is rigidly connected to tr-slaughter and made with a variable wall thickness and two They have the axial symmetry axes of the cross section, and the major axis of this section is at an angle to the major axis of the pipe section. In addition, the thickness of the elastic ring along the major axis of symmetry is made larger than the thickness of the ring along the minor axis. . Between elastic and rigid rings, bodies are placed to acheni, a rigid ring and a pipe are fitted with a return ring. FIG. 1 shows a device, a general view;, FIG. 2, a section A-A in FIG. 1, (with the arrangement of the elements of the device corresponding to the static pressure in MaracTpajiji); in fig. 3 is the same (with the arrangement of the elements of the device; at the time of the damping of the water hammer). The device for damping water hammer includes connecting fittings 1 and 2, a section of thin-walled pipe 3 with a non-circular, oval, oval, transverse voice form. On the pipe-3 in its middle part there is an elastic ring 4, rigidly connected to the pipe. A rigid ring 6 is installed on the ring 4 through one-dimensional rolling bodies 5, Ring 4 is made with a variable wall thickness and has two axes of symmetry of the cross section X-X and Y-Y. The outer surface of the ring 4 has a cross-sectional shape analogous to the shape of the cross-section of the used pipe 3, the ring 4 is installed on the pipe 3 so that its large axis is nonepe4Horq section X-X does not coincide with the large axis of the section of pipe ZZ at an angle oL, Thickness the ring 4 along its major axis of symmetry X-X is made larger than the thickness along the small axis YY, therefore the outer surface of the ring 4 is ovality larger than for pipe 3. The semi-axes of the minor axis of pipe 3 intersect the outer surface of ring 4 at an angle different from 90 . The inner surface of the rigid ring 6 is made equidistant to the outer surface of the ring 4. On the ring 6 and the pipe 3, the return spring 7 is fixed. The device works as follows. In the steady state flow of the working fluid, the static pressure is perceived by the walls of the connecting reinforcement 1 and 2 and the pipe 3 The wall of the pipe 3 tends to acquire the shape of a circle. At the same time, the equally effective internal pressure forces, bulging from the inside, pipe 3, are directed along the mother axis of the cross section of the pipe, they are through an elastic ring 4; are transmitted to the rigid ring 6. Since the pressure angle between the rings 4 and 6, separated by the rolling bodies 5, is made greater than the friction angle, which is ensured by selecting the oi of the ovality of the pipe 3 and the thickness of the ring 4, due to the wedge effect, form a pair of forces that causes the ring 6 to rotate relative to the pipe 3 and the ring 4. This is opposed by the spring 7, creating a force that balances the torque on the ring 6 from the spreading forces of the pipe at the nominal static pressure in the line. Adjusting the force of the spring 7 to achieve the position of the ring b, in which the cross section of pipe 3 at the nominal static pressure in the line corresponds to that in the absence of pressure. The large axis of the cross section Kol 3 4 ca 6, defined by the angle I, coincides with the large axis of the ring 4 offset by the angle Oi from the major axis of the pipe 3 (in Fig. 2ot). When the fluid flow is cut off or changed in the internal cavity of the pipe 3, a hydraulic shock occurs, the pressure at which exceeds the nominal static pressure. The resulting expansion forces overcome the resistance of the spring 7. The ring b rotates relative to the ring 4 in the direction of increasing the radius vector of its inner surface, making it possible to increase the small axis of the pipe 3, the larger axis of the pipe 3 decreases, and the cross section approaches the shape of a circle. . 3, the rotation of the ring 6 occurs in the direction of rotation of the hour sterling until the spreading forces from the side of the pipe 3 are balanced by the force of the extended stem 7, up to the transformation of the cross section of the pipe 3 into a circular one. The major axis of the ring b, defined by angle 2, does not coincide with the initial-1 (with a static static pressure in the line) the position of the major axis of the ring 4 JP2 I The rigid ring b, rotating, causes the elastic walls of the ring 4 to deform equidistantly to its transverse Depending on the angles oi and p2, the corresponding shape of the deflection and the pipe wall 3 leads to an increase in the cross-sectional area of the pipe and, consequently, the volume of the internal cavity. This reduces the pressure of the water hammer, whose energy is quenched to overcome the resistance of the spring and the walls of the pipe when they are formed. With the passage of the shock wave front, the pressure in the line decreases, the expansion forces decrease, the force 7 overcomes the moment of the pair of expansion forces on the ring b and turns it in the opposite direction (counterclockwise in FIG. 3), returning it to its original state at a nominal static line pressure (FIG. 2), The device is ready to be reactivated. The technical and economic efficiency of the invention is as follows. that) the efficiency of damping hydraulic impact is reduced when reusable, since the rings serve as an intermediate support, which allows to reduce the thickness of the pipe wall, which, in its turn. ZH-Ed, allows you to avoid the occurrence of plastic deformail in its material when forming a cross section, as a result of which the elasticity of the pipe, with repeated tripping, remains constant. (.

Claims (4)

1.. EXTINGUISHING DEVICE HYDRAULIC SHOCK containing a section of a thin-walled pipe with a non-circular cross-sectional shape, characterized in that, in order to increase the efficiency of quenching a water hammer during repeated use, elastic and rigid rings are mounted on the pipe, interfaced to each other along equidistant cylindrical surfaces with a similar pipe a cross-sectional shape, the elastic ring being rigidly connected to the pipe and made with a variable wall thickness and two different-sized symmetry axes of the cross-section, n When in use, the major axis of the section located below · angles to the larger tube section axis. ' 2. The device according to π. 1, the fact that the thickness of the elastic ring along the greater axis of symmetry is greater than the thickness of the ring along the minor axis, 3, A device according to π, 1, characterized in that rolling elements are placed between the elastic and rigid rings, 4. The device according to π, I, the rest is that a return spring is installed between the rigid ring and the pipe.