SU1432364A1 - Arrangement for sealing pipes in hydraulic tests - Google Patents

Abstract

This invention relates to instrumentation technology. The purpose of the invention is to increase the reliability of the tests. To do this, in the fixation unit, the piston of the power cylinder (SC) 1 is made in the form of an outer ring casing 2 and installed inside: a rod (w) 3, which with its spherical end 4 contacts the sealing cone 5. A ring 6 is rigidly connected to the SC 1 inner conical surface. The crown of wedges (VK) 7 is covered with ring 6 and fixes the device. When the test pressure is applied, the annular cage 2, which interacts with its end face with the VC 7, transmits a pressure force to it. This force partially compensates for the force acting on VK 7 from SC 1 through ring 6. At the same time, W 3 presses the sealing cone 5 to the end of the test tube. This provides a reliable seal, since the area Ø 3 is larger than the opening area of the pipe. 1 il. - and cl

Description

eleven

2 1

4ib OF 1 chE

WITH

O5

T

This invention relates to instrumentation engineering and can be used to seal pipes thereof. tests on the strength and tightness of excess pressure by the medium M.

The purpose of the invention is to increase the reliability of the tests.

The drawing shows the device, the general view.

The device for sealing the pipes during hydraulic tests contains a power cylinder 1 with a piston made in the form of an outer ring casing 2 and a stem 3 with a spherical end 4 installed inside the cage 2 and connected to the stem 3 with a sealing cone 5 with a spherical depression (not shown) forming together with spherical end 4 of stem 3; a ball joint (not shown) rigidly coupled to a body (not shown) of a power cylinder

1 ring 6 with inner conical surface (not shown), wedges 7, i.e. a counter conical surface (not shown) for fixing on the pipe

.8 and the yoke 9, connected to the venzon wedges 7 and having an external thread 10, on which the nut 11 is installed, come into contact, and with its end (not shown) with ring 6, the outer ring (2) is in contact with a crown of wedges 7. In the rod 3.. The channel 12 was supplied to supply the test medium to the pipe 8 and the channel 13 to inject air from the pipe 8, and in the power cylinder 1 - to the same channels for the supply of liquid 4 and air 15 to it. In addition, openings 16 are made on the power cylinder 1 and the ring cage 2 to access the channels 12 and 13 of the rod 3. The cross-sectional area (not identified) of the ring cage

2more section area (not indicated) of stock 3.

The device works as follows.

The cage 9 with the crown of the wedges 7 is inserted into the ring 6 and the nut 11 is screwed onto the cage 9, the power cylinder 1 is screwed onto the ring 6, the device is mounted on the pipe 8, the collar 9 of the cage 9 is displaced by turning the nut 11 7 and pre-compress the crown of wedges 7, closing - flat device on the pipe 8,

Through channel 14, liquid is supplied to no.; IocTb (not shown) of force qi

50

five

about 0

d

five

lindra 1. In this case, the ring holder, having a large cross-sectional area, first moves, rests its end on the crown of wedges 7, and the power cylinder 1 moves to the other side, finally tightening the ring 6 on the crown of wedges 7, then the rod 3 moves under pressure in cylinder 1. And, resting its spherical end 4 on the sealing cone 5, presses the latter against the end (not shown) of pipe 8, seals it. At this, due to the ball joint in the joint of the Stock 3 with sealing cone 5, the latter self-aligns at the end of the pipe 8. Then through the channel 12, the liquid under the same pressure is fed into the cavity (not shown) of the pipe 8,

Due to the equality of pressures in the cavity of the cylinder and the pipe 8, the force that presses the sealing cone to the pipe 8 is greater than the force that pushes it away from the pipe 8, since the cross-sectional area of the rod 3 is greater than the hole area (not shown) of the pipe 8. At this force, transmitted through ring 6 on the crown of wedges 7 i pulling off the wedge 7 from the pipe 8, is partially compensated by the force acting on the wedge 7 in the opposite direction from the side of the ring casing 2, while maintaining the frictional force between the wedges 7 and the pipe 8 arising due to the interaction of conical pover goodness

rings 6 and wedges 7. This is the case

This significantly increases the reliability of fixing the device on the pipe 8. The angle of taper of the surfaces of the ring 6 and the wedges 7 may, in this case, exceed the friction angle between the wedges 7 and the pipe 8.

The efficiency of the device is determined by the high reliability of its fixation on the test tube due to partial compensation of the force pulling the device off the pipe by making the piston in two hours. Tey, one of which — the outer race — rests on the crown of the wedges, performed the indicated force compensation, and the other — the inner stem — presses the sealing cone to the pipe, sealing it.

Claims (1)

Invention Formula A device for sealing pipes. During hydrotesting, containing 31432364. with a piston connected with reliability of tests, the piston is the last with the help of a ball joint-filled in the form of an outer annular casing, a sealing cone rigidly connected with its end face tied to the body of the power cylinder by a wreath of wedges, and installed ring with inner conical surface inside the stem cage with spherical bone and crown of wedges having an end-end in contact with an outer conical outer surface cone, while the cross-sectional area for fixing on the pipe, the case of the o-ring ring is larger than that, in order to increase the IQ of the stem section.