SU1586526A3 - Arrangement for closing and sealing ends of pipes for internal pressure loading - Google Patents

Abstract

The invention relates to a device for hydrotesting pieces of plastic pipes and improves the reliability of sealing by eliminating the release of the holder and ensuring the proportionality of the clamping force and the pressure of the test. Each holder 1 and 2 is made in the form of a housing 5 with an annular groove 6, in which is placed a movable element 8 in the form of an annular bottom. The movable element 8 has a conical surface that interacts with the conical surface of the elastic clamping conical ring 7. The flange 14 of the housing 5 and the flange 15 of the ring 7 are made with slots offset from each other by the same angular pitch. The axial force acting on the ring 7, caused by the pressing of the movable element 8 when water is supplied through the check valve 9, is directed in the opposite direction relative to the axial force from the fluid pressure filling the pipe 4 trying to reset the holder 1 or 2 from the end of the pipe 4. This contributes the appearance of proportionality of the clamping force and pressure in the pipe 4. 3 Il.

Description

The invention relates to a test apparatus, and specifically to a device for hydrostatic plastics pipe sections with internal pressure.

The purpose of the invention is to increase the reliability of the sealing by eliminating the release of the holder and ensuring the proportionality of the clamping force and the test pressure.

FIG. 1 shows a device attached to the ends of the pipe; on. FIG. 2 - the case, type A in FIG. 1; in fig. 3 — conical ring, view A in FIG. one,

The device for plugging the pipe ends under loading / internal pressure to gggomgiztizatsii is a set of two holders 1 and 2. The upper holder 1 has an opening 3. connecting pipe 4 with the hydraulic system of the test apparatus (not shown) and serves to remove pipe 4 air and fill it with working medium.

Each of the holders 1 and 2 is made in the form of a housing 5 with an annular groove 6. In the housing 5 there is an elastic clamping conical ring 7.

po

sh

3 1586526

In: an annular groove 6 of the housing 5 between its bottom and the conical ring 7 is placed an annular movable element 8i have the form of an annular bottom. A check valve 9 is installed in the opening of the housing 5 for supplying fluid under pressure to the cavity BETWEEN the elements 8 and the housing 5i. The elastic gaskets 10 are placed on the shticular surfaces of the KJopnyca 5 and the movable element 8, the elastic gasket 11 for sealing 10

3atsiya pipe 4 - on the inner surface of the movable element 8 with the side I "

nor, the opposite cavity for submission of fluid.

I Underside element 8 lays on this side of the inner conical surface 12, the apex of which is facing away from the conical ring 7. The surface 12 interacts with the conical surface 13 to | of the end 7. Case 5 in the lower part has a flange 14, facing the flange 15 to | onus ring 7. Both flanges 14 and t5 are made with radial slits with (placed one relative to the other) The same angular pitch, and the width of the groove in the flange 14 of the housing 5 is large and (e protrusions metkdu slots 4pants 15 conical ring 7. Device operation e t following - Daz.

After application of the 4 holders 1 and 2 to the ends of the pipe, through them, through the check valves 9, the water is supplied with an overpressure. The pressure in Dy acting on the movable element I causes it to move in the housing 5 and clamp the conical ring 7 on the pipe 4. At the same time, the elastic orifice 11 presses against the end surface of the pipe 4, sealing it with Yrie, thereby filling the pipe with water through hole 3,

There is a phenomenon, called the proportion of the force of the clamping holder 1 or 2, and the pressure of the liquid filling the test pipe 4, i.e. the pressure of the test. This phenomenon is that as the pressure increases, the pressure automatically increases, leading to the clamping of the holder regardless of the pressure value of the supply holder.

The experiment was carried out with constant pressure Š in holder 1 (2) and various pressure values inside the tube.

0

0

0

five

with j

15

40

45

50

55

4. The course of events was identical, i.e. in holder 1 (2), the pressure increased according to the pressure of the test.

The axial force acting on the clamping conical ring 7, caused by pressing this ring 7 of the movable element 8, is directed in the opposite direction relative to the axial force from the pressure of the fluid filling pipe 4 trying to reset the holder 1 or 2 from the end of the pipe 4. This The mutual destruction of both forces positively affects the proportionality of the clamping force of the holder to the value of the pressure of the liquid filling the tube cavity. The result of this is a zero value of the final resultant force aimed at discharging the holder from the end of the pipe.

Claims (1)

Invention Formula A device for plugging and sealing the pipe ends when loaded with internal pressure, containing a holder with a response connecting the pipe to the hydraulic system of the test apparatus and a 1m case for removing air from the pipe and filling it with a working medium, made in the form of a body with an annular groove, and an elastic clamping conical rings with a flange installed in the housing with the possibility of mounting on the outer ijji-lindrical surface of the pipe, an annular movable element housed in the annular groove of the building between the bottom and the conical ring with the possibility of axial movement and supply of fluid under pressure in the cavity between the movable element and the case through the hole in the case, and elastic straps, one of which is placed between the outer cylindrical surface of the movable element and the inner cylindrical surface body and another on the sub element for sealing the pipe, characterized in that, in order to increase the reliability of the sealing by eliminating the discharge of the holder and ensuring prop With the strength of the clamping force and pressure test, it is equipped with a second holder, made similar to the first one and forming 1m with it a set of two holders - upper and lower, of which the upper NII holder has a hole for air bleeding and filling the pipe with working medium, check valve an anvilous gasket inserted into the opening of the housing, placed under the inner cylindrical surface of the movable element having the form of an annular bottom, and 1586526 6 on the same side has an inner conical surface, the top of the cone of which faces Chchstoron from the conical ring and which interacts with the outer conical surface of this ring, the housing in the lower part has a flange facing the flange of the conical ring, both flanges of the centrally cylindrical part are filled with radial slit, offset, elastic gasket for hermetically wired one relative to the other the same angular pitch, and the width of the slots in the flange of the housing are larger than the roundness of the projections in the flange of the conical; tiza end of the pipe is installed on the inner surface of the rolling element on the side opposite to the cavity dp fluid supply, which 15 rings. 1586526 6 on the same side has an inner conical surface, the top of the cone of which faces Chchstoron from the conical ring and which interacts with the outer conical surface of this ring, the housing in the lower part has a flange facing the flange of the conical ring, both flanges are filled with radial slots t, displaced w one relative to the other 15 rings. 1 15