RU2000919C1 - Device for jet-abrasive machining of inner tube surface - Google Patents

Abstract

Use in various industrial sectors. when cleaning the surface of pipes or coating them. Essence: the presence of an adjustable gap formed by a swirl and an accelerating nozzle allows to increase reliability and expand technological capabilities by changing the degree of twist of the jet-abrasive flow from the maximum value to 0. 1 id

Description

The invention relates to devices for abrasive-abrasive treatment of the inner surface of pipes and can be used in various industries for cleaning the surface of pipes or coating them,

A device is known for blast-abrasive treatment of the inner surface of pipes, including a hollow body, a mixing chamber and fittings for supplying abrasive material and energy carrier, a channel made in the form of a snail with a profile along a spiral of Archimedes.

In the known device, the degree of swirling of the energy carrier flow is not regulated, which significantly reduces the range of technological capabilities of the device.

A device for blast-abrasive treatment of the inner surface of the pipes, including a housing, a nozzle, an abrasive supply pipe and means for twisting the energy carrier, while the output end of the abrasive supply pipe extends beyond the output end of the nozzle by a distance equal to 0.5-2.0 of the outer diameter the abrasive supply pipe, and the nozzle diameter is 0.3-0.6 of the inner diameter of the pipe being machined.

In this known device, the degree of swirling of the energy flow is not regulated, which also limits the technological capabilities of the device.

The ability to adjust the degree of swirling of the energy carrier is available in a device for abrasive blasting of the inner surface of the pipes, including a housing with channels for supplying abrasive material and an energy carrier and a cone divider with a sharp outlet edge to form a jet in the form of a hollow cone; a pressure washer is installed on the side of the wide part of the divider with means for moving it along the axis of the divider.

However, this device has low reliability due to intense abrasive wear of the spreader, as well as limited technological capabilities due to the narrow range of the cone opening angle.

This device is a prototype.

The aim of the invention is to increase the reliability of the device and expand its technological capabilities.

This is achieved in a device for blast-abrasive treatment of the inner surface of the pipes, including a housing with channels for supplying abrasive and energy carrier, a collector, a swirl, a nozzle and an abrasive tube, while the swirl and air nozzle form an adjustable

gap. The amount of clearance is controlled by the movement of the air nozzle.

A distinctive feature of the proposed device is the presence of an adjustable gap between the swirl and the air nozzle. An additional feature is that the clearance is controlled by the movement of the air nozzle.

Due to the presence of an adjustable gap between the swirl and the air nozzle, part of the energy carrier from the collector to the nozzle goes through the swirl, and part through the adjustable gap. This allows you to change the degree of twist of the jet-abrasive stream from the maximum value to zero, which greatly expands the range of technological capabilities of the device. And the lack of dividers prone to

intensive wear in the jet-abrasive stream, increases the reliability of the device.

The drawing shows a diagram of a device for abrasive blasting of the inner surface of pipes.

The device comprises a housing 1 with nozzles for supplying an abrasive 2 and an energy carrier (air) 3, an air collector 4, a swirler 5 and an accelerating nozzle 6, between which there is an adjustable gap 7,

abrasive tube 8.

The device operates as follows.

Abrasive is supplied through nozzles 2f and 3 into tube 8 and manifold A, respectively, and

air. Part of the air passes through the swirl 5 and swirls. Another part of the air passes into the nozzle 6 directly from the manifold 5 through the gap 7 in the form of a radial flow. Swirling and radial flows

The air mixes and enters the nozzle 6. A swirling air stream leaves the air nozzle 6, picks up the abrasive and directs it to the surface being cleaned.

The optimal size of the adjustable gap 7 depends on the nature and degree of pollution, on the density and fractional composition of the abrasive, on the parameters of the energy carrier used (air, water, steam) and

selected experimentally.

Technical and economic advantages for abrasive blasting of the inner surface of pipes compared to the prototype device are to increase reliability, increase the service life of the device by 1.5-2.0 times and expand the range of its technological capabilities.

(56) Copyright certificate of the USSR Ns 1360827. cl. At 24 C 5/04. 1987.

Claims (1)

The claims DEVICE FOR JET-ABRASIVE SAMPLING OF PIPE INTERNAL SURFACE, CONTAINING a housing with an axial abrasive supply pipe and a swirl coaxially fixed to it in the cavity of the housing. as well as an energy supply pipe and an accelerating nozzle, characterized in that the accelerating nozzle is made in the form of a sleeve with a thread on the outer surface, designed to interact with a similar thread made on the output part of the housing and providing a change in the axial position of the accelerating nozzle relative to the swirl. Air + cttjpc $ u6 /. Air