RU71569U1 - DEVICE FOR CLEANING THE INTERNAL SURFACE OF PIPES FROM DEPOSITS - Google Patents

Abstract

The utility model relates to the field of cleaning the inner surface of pipes from preservative grease, corrosion, paraffin, various deposits, old coatings in various industries - petrochemical, gas, food, etc. and allows to reduce the transverse dimensions of the device and to ensure high-quality cleaning of the inner surfaces of pipes of small diameters, while maintaining high performance. The device comprises a thermogas generator, inside the housing (1) of which, with a gap (2) and coaxially to it, a combustion chamber (3) and a nozzle (4) are installed to exit the high-temperature gas. The gap (2) has a broadening in the region of the end wall of the thermogas generator and through it is in communication with a pipe (5) for supplying air, which is located on the end side of the body (1) of the thermogas generator without protruding beyond its mid-section. At the entrance to the combustion chamber (3), a centrifugal fuel nozzle (7), an element for igniting the combustible mixture 8 are installed. On the outlet side of the nozzle (4), an ejector (9) with a mixing chamber (10) is mounted rigidly connected to the hollow tray (11) whose cross section is in the shape of a crescent. The tray (11) is located along the body of the thermogas generator and covers it, while the convex side of the tray (11) corresponds to the inner radius of the pipe being cleaned, and the concave side corresponds to the outer radius of the thermogas generator body (1). The input of the tray (11) smoothly mates with the abrasive supply pipe (12) located on the side of the end wall of the thermogas generator. 1 s.p. f-ly, 2 ill.

Description

The utility model relates to the field of cleaning the inner surface of pipes from preservative grease, corrosion, paraffin, various deposits, old coatings in various industries - petrochemical, gas, food, etc.

A device is known [RF patent No. 2184002, IPC B08B 9/02, 5/00, publ. 06.27.2002, BI No. 18], which contains a thermogas generator, nozzles for connecting with hoses for supplying air, fuel and abrasive material, a hollow rod, and also a nozzle for the release of high-temperature gas. The casing of the device is made curved, inside which, in accordance with its shape, a combustion chamber of the thermogas generator is installed with a gap relative to it, in communication with the air supply pipe from the nozzle side to exit the high-temperature gas. At the entrance to the combustion chamber of the air flow, a swirl and a centrifugal fuel nozzle are concentrically mounted, and an element for igniting the combustible mixture is installed on the side wall of the combustion chamber. The nozzle exit is equipped with an injector with a mixing chamber located inside it, in communication with the pipe for supplying abrasive material. The gas and gas generator supplies air and fuel. A centrifugal nozzle is used to prepare the fuel for ignition and combustion. To ignite the mixture, a special element for ignition in the form of an electric candle is used. There is also a flame detector. Thermogas generator operation is controlled remotely. A supersonic stream of combustion products flows into the ejector, which serves to transport the abrasive and accelerate its particles to high speeds. The curved shape of the gas generator housing allows you to direct a high-speed and high-temperature stream of combustion products and

particles of abrasive on the inner surface of the pipe in a fairly wide range of diameters. At the same time, the pipe is rotated by means of a drive and the device is moved longitudinally by means of a rod, which are controlled remotely. The device allows you to qualitatively clean the inner surface of pipes of various diameters in a wide range, automatically turn off the fuel supply when burning ceases. However, the sufficiently large transverse dimensions of the device limit its use for pipes with small diameters.

Closest to the proposed utility model is a device [RF patent No. 2282504, IPC B08B 9/032, B08B 5/00, publ. 08/27/2006, Bull. No. 24], which is taken as a prototype. The device contains a gas and gas generator, inside the housing of which, in accordance with its shape, a combustion chamber and a nozzle for the release of high-temperature gas are installed with a gap. The gap is communicated with a pipe for connecting to the air supply line, which is located at the outlet of the combustion chamber. A shut-off element is installed on the air supply line, providing two fixed flow rates - for starting the device and for operating mode. To supply air in the combustion chamber, a network of radial channels is made in its wall, and in its front part there is a prechamber in the form of two shells that form a longitudinal gap between themselves, which is connected with a gap through the openings of the wall of the thermogas generator through openings. The outer shell is associated with the wall of the combustion chamber, and the inner is located with a radial slotted gap relative to the end wall. At the entrance to the pre-chamber, a centrifugal fuel nozzle and an ignition element are eccentrically mounted. The installation of the ignition element, the fuel nozzle and the flame sensor on the side of the end wall of the gas generator significantly reduces the transverse dimensions of the device and allows you to increase the range of pipes to be cleaned towards smaller diameters.

However, in this device, a further reduction in the transverse dimensions of the device is limited by the presence of an abrasive supply pipe to the ejector located in the front of the device, as well as an air supply pipe installed in the area of the combustion chamber exit in the area of the nozzle.

The technical result, which is achieved by the proposed utility model, is to reduce the transverse dimensions of the device, which ensures high-quality cleaning of the inner surfaces of pipes of small diameters, while maintaining high performance.

The technical result is achieved by the fact that in the device for cleaning the inner surface of pipes from deposits containing a gas generator, including a combustion chamber installed with a gap relative to the body of the gas generator, with a nozzle and an ignition element located on the side of the end wall of the gas generator, a nozzle for the exit of high-temperature gas at the outlet which has an ejector with a mixing chamber, an air supply pipe in communication with a gap between the body of the gas generator and the combustion chamber, abrasive feed pipe, new is that the ejector has a hollow crescent-shaped abrasive feed tray located along the thermogas generator body and covering it, the tray inlet mates with the abrasive feed pipe located on the side of the thermogas generator end wall, and the output is connected to to the ejector, the air supply pipe is also installed on the front side of the thermogas generator.

A shell is installed in the combustion chamber from the side of the end wall of the thermogas generator, and a longitudinal slit formed by the shell and the wall of the combustion chamber is communicated from the end wall of the thermogas generator body with a gap between the combustion chamber and the housing.

Figure 1 and 2 presents respectively longitudinal and transverse sections of the device.

The device comprises a thermogas generator, inside the housing 1 of which, in accordance with its shape, with a gap 2 and coaxially mounted to it, a combustion chamber 3 and a nozzle 4 for the release of high temperature gas. The gap 2 has a broadening in the region of the end wall of the gas generator and through it is connected with a pipe 5 for connecting to the air supply line, which is located on the end side of the body of the gas generator without protruding from the mid-section of the gas generator. To supply air to the combustion chamber 3, a network of radial channels is made in its wall 6. At the entrance to the combustion chamber 3, a centrifugal fuel nozzle 7 and an element for igniting the combustible mixture 8 are installed eccentrically from the end wall of the thermogas generator, for which a standard spark plug can be used - spark or incandescent, as well as a flame detector, which can be used as a thermocouple. At the outlet of the nozzle 4, an ejector 9 with a mixing chamber 10 is mounted, rigidly connected to the hollow tray 11, the cross section of which has the shape of a crescent, and a pipe 12 for supplying abrasive material. The tray 11 is located along the body of the gas and gas generator and covers it, while the convex side of the tray corresponds to the inner radius of the pipe being cleaned, and the concave side corresponds to the outer radius of the gas generator body 1. The input of the tray 11 smoothly mates with the supply pipe of the abrasive 12, located on the side of the end wall of the gas generator. Sufficiently high strength and rigidity of the structure, consisting of the ejector body 9 and the tray 11, allow it to be used as the main load-bearing element of the device, on which a thermogas generator is installed from the side of the concave surface of the tray 11. The mixing chamber 10 of the ejector 9 can be installed coaxially with the axis of the gas generator, or at some angle to it.

The fuel is supplied to the nozzle 7 through an electromagnetic valve 13. The device is mounted on a rod designed for its longitudinal movement inside the pipe being cleaned. Remote control of the start-up and operation of the device is carried out automatically according to a predetermined program or in manual mode using a control panel that is electrically connected to the flame detector and actuators (ignition element 8, fuel solenoid valve 13, shut-off element on the air line). The control panel and flame detector in FIG. not shown.

The device operates as follows. The nozzles 5, 12 and the inlet fitting of the fuel solenoid valve 13 are connected to the supply lines, respectively, of air, abrasive material and fuel. Connect the electric cables coming from the control panel to the actuators and the flame detector. The device is placed inside the pipe being cleaned. The startup program is as follows. A shut-off element is opened on the air line, providing a starting air flow rate, the ignition element 8 is turned on, the fuel solenoid valve 13 opens. In the cylindrical combustion chamber 3, which has a large relative length and small radius, a pre-wall mixture formation scheme is carried out. The main part of the conical fuel sheet, flowing out from the centrifugal nozzle 7, falls on the wall of the combustion chamber 3, as if dividing it into two zones - the main one - from the nozzle to the sheet, the back - in the region of the end wall of the thermogas generator, which at the time of launch plays the role of a pre-chamber, where the ratio of fuel components necessary for ignition is provided. After ignition of the mixture, the shut-off element on the air line opens completely, the thermogas generator goes into operating mode.

Through the pipe 12 and the tray 11, the abrasive material is fed into the ejector 9 and the drive mechanism is turned on to operate, which rotates the pipe being cleaned and the rod feeds longitudinally with a device fixed to it for cleaning the inner surface of the pipes. The abrasive in the mixing chamber 10 accelerates to high speeds. An expanding high-temperature and high-speed jet of combustion products and abrasive gets on the pipe surface being cleaned and leads to the removal of deposits and rust from the most inaccessible places, providing high quality cleaning to a metallic luster.

The proposed device is intended for cleaning the inner surfaces of pipes of small diameters from deposits, significantly increases the range of pipes to be cleaned towards smaller diameters, has a high resource, reliable and convenient to use, can be manufactured for a specific pipe size.

Claims (2)

1. A device for cleaning the inner surface of pipes from deposits, containing a thermogas generator, including a combustion chamber installed with a gap relative to the body of the thermogas generator, with a nozzle and an ignition element located on the side of the end wall of the thermogas generator, a nozzle for the exit of high-temperature gas, at the outlet of which an ejector with mixing chamber, air supply pipe, connected with a gap between the thermogas generator body and the combustion chamber, abrasive supply pipe, characterized in that that the ejector has a hollow tray for feeding abrasive with a cross-section in the shape of a crescent, located along the enclosure of the thermogas generator and covering it, the input of the tray is mated to the abrasive supply pipe located on the side of the end wall of the thermogas generator, and the output is connected to the ejector, the air supply pipe is also located from the front side of the gas generator. 2. The device according to claim 1, characterized in that a shell is installed in the combustion chamber from the end wall of the thermogas generator, and a longitudinal slit formed by the shell and the wall of the combustion chamber is communicated from the end wall of the thermogas generator body with a gap between the combustion chamber and the housing.