RU2769412C1 - Pipeline gas flow shutoff device - Google Patents

Abstract

FIELD: gas industry.

SUBSTANCE: invention relates to a device for shutting off gas flow and stopping gas supply in case of increase or decrease of controlled pressure. Device for shutting off gas flow in a cylindrical pipeline comprises a shutoff assembly structurally connected to a compressed air supply unit. Shut-off unit is made in the form of a body and a gate coupled with each other to form a sealed channel filled with compressed air through the supply unit. Gate is equipped with two oppositely fixed in the housing semi-axes, which form a single axis of its rotation from an open horizontal position to a closed working vertical position inside the pipeline and vice versa. One of the semi-axes rigidly connected to the gate plane is made with the possibility of receiving movement from the geared motor through the worm gear. Second semi-axle is equipped with bearing assembly. All elements of the device in contact with the transmitted medium are made of metal and/or alloy resistant to this medium.

EFFECT: improvement of reliability of device for shutting off gas flow in cylindrical pipeline due to combination in one design of reliable mechanical sealing when shutting off gas flow with trouble-free worm gear used to fix position of device gate.

3 cl, 3 dwg

Description

The invention can be used in the metallurgical, chemical, energy and other industries and is intended to shut off the gas flow and stop the gas supply in the event of an increase or decrease in the controlled pressure above the specified limits, as well as for guaranteed disconnection of equipment from gas pipelines, preventing the penetration of a dangerous gaseous medium and ensuring the safety of maintenance personnel during maintenance and repair work.

Known gas damper mechanism according to RU76474 U1, publ. 09/20/2008, where rubber resistant to aggressive media with fluorine inclusions is used as a sealing material for the cover. However, the design of this damper contains an eccentric, the use of which is supplemented by a spring clamping mechanism for more reliable closing of the lid, which complicates the design and requires constant monitoring of the eccentric actuation.

The closest set of design features is a device for shutting off the gas flow in the pipeline, known from US 3019819 A, publ. 02/06/1962. In this solution, an increase in the degree of compaction is provided by the supplied compressed air. The design is quite simple, however, a material is used as a sealant, which eventually loses its elasticity and collapses under the influence of an aggressive gaseous medium passing through the damper. Gas, through the cracks and destruction of the sealing material, can seep into the working area. The reliability of the operation of such shutters depends on the properties of the sealing materials, as well as the shutter locking mechanism.

Thus, there is a problem of eliminating or minimizing corrosive materials in the design, while providing a simple but high-quality means of fixing the shutter.

The technical result provided by the invention consists in increasing the reliability of the device for shutting off the gas flow in a cylindrical pipeline due to a design devoid of the shortcomings of the closest analogue, in which reliable mechanical sealing when the gas flow is shut off is provided by additional air channels at the junction of the edge of the shutter and the inner part body and a virtually trouble-free worm gear used to fix the position of the device's shutter.

The technical result is achieved by a device for shutting off the gas flow in a cylindrical pipeline containing a shut-off unit structurally connected to the compressed air supply unit, in which, according to the invention, the cut-off unit is made in the form of a housing and a shutter mated to form a sealed U-shaped or └┘ -shaped channel filled with compressed air through its supply unit, the valve is equipped with two half-axes fixed in the housing oppositely, forming a single axis of its rotation from the open horizontal position to the closed working vertical position inside the pipeline and vice versa, and one of the semi-axes is rigidly connected to the shutter plane, made with the possibility of receiving movement from the motor-reducer through a worm gear, and the second axle shaft is equipped with a bearing assembly.

All elements of the device in contact with the passed medium are made of metal and/or alloy resistant to this medium. As the metal and/or alloy used, carbon or heat-resistant steel, or titanium alloy.

The design of the cut-off unit of the device for shutting off the gas flow in the cylindrical pipeline has a prefabricated structure made of two round planes, each of which has a part of the metal removed along the edge. On the inner side of the body of the device, by welding across the gas flow, paired porches of different sizes are installed (one is higher than the other so as not to interfere with the opening and closing of the shutter), made of metal strips and selected in such a way that when the planes of the device adjoin, an annular ring is formed along the contour of the device. free space where air is supplied under pressure. To supply air to the air channels, a compressed air supply unit is provided, to which compressed air is supplied from the general plant network or an external source of air supply with a pressure of about 5 bar. Due to the significant pressure difference in the air annular channel of the device and the main gas duct, the gas from the main gas pipeline cannot overcome the air barrier and penetrate into the off zone. The tightness of the pipeline provided by the device reaches 100%.

The appearance of the device is shown in Fig. 1 and in FIG. 2 with a cut, where:

1 - motor-reducer;

2 - vestibule;

3 - body;

4 - bearing assembly;

5 - axle shaft;

6 - shutter;

7 - compressed air supply unit;

8 - air channel;

9 - jumper.

In FIG. 3 shows the pipes of the compressed air supply unit 7, suitable for the air channel 8, positions are not indicated.

The design of the device and the principle of operation are described below.

All elements of the device in contact with the passed medium (device body 3, shutter 6, axle shafts 5, etc.) are made of carbon or heat-resistant steel, or titanium alloy or other known suitable metals and alloys resistant to the passed medium, for stable operation in abrasive or chemically hazardous environments. The service life of the device is 20 times longer than dampers with sealing material.

The device is manufactured for a specific size of the gas duct and with an internal diameter corresponding to the internal diameter of the gas duct. Accession - flanged, holes for bolted connection are made along the circumference of the body.

The shutter 6 is made of two sheets of metal of a round shape, attached to the axle shafts 5. A part of the metal has been removed along the edge of each sheet to form a fit to the porches. The diameter of one edge is larger than the other, so as not to interfere with the opening and closing of the shutter, Fig.2.

Along the outer circumference of the shutter, between the sheets, indented from the outer edge, two jumpers 9 are made. The semiaxes form a single axis of rotation of the shutter and are installed in the body 3 of the device. On one of the axle shafts, a geared motor 1 is installed, the power of which is selected for a specific type of device and depends on its overall dimensions. Bearing assembly 4 is installed on the second semi-axis.

In the inner cavity of the device around the circumference, across the gas flow, two porches are installed.

The compressed air supply unit 7 is configured to be connected to the factory compressed air network or to an external air supply source.

In the open position, the shutter is located horizontally, in the direction of gas flow. Due to the fact that the thickness of the shutter has a much smaller size in relation to the cross section of the passage, in the open position the device does not create a large hydraulic resistance to the gas flow.

If it is necessary to shut off the gas flow, the electric motor of the motor-reducer 1 is energized. The rotation of the motor shaft through the worm gear pair is transmitted to one of the semi-axes 5, which is rigidly connected to the shutter planes 6. Rotating around its axis, the semi-axis drags the shutter plane along with it and turns it across the gas flow. After closing the shutter, the voltage from the electric motor is turned off and the rotation stops. In the closed position, the shutter is securely held due to the mechanical connection of the worm gear pair. In the extreme closed position, the displaced edges of the shutter planes are in contact with the planes of the porches, forming two annular air channels 8.

Due to the fact that the air pressure in the air channel significantly exceeds the pressure of the gaseous medium, air penetrates into all leaks in the seal and gates, displacing the gas and preventing it from passing into the off zone. The tightness of the device reaches 100%.

An example confirming the achievement of a technical result.

A series of tests of the gas flow shutoff device was carried out at the production site of Industrial Vostok Engineering LLC. The fan pumped smoky air into the pipe, at the end of which a device for shutting off the gas flow was installed. A constant overpressure of 9000 Pa was created in the air duct. The device was visually observed by a commission of 3 people. In the conclusion of the commission, it was indicated that during a series of tests the device for shutting off the gas flow worked flawlessly and 100% tightly, smoky air did not penetrate through it.

The tests were carried out with a cycle of 240 times during the month, the gas flow shut-off device fully confirmed the declared characteristics, 100% tightness.

The advantages of the proposed design of the device for shutting off the gas flow in the pipeline are: a long trouble-free service life, simplicity of design, ensuring reliable shutdown and isolation of equipment from an abrasive or chemically hazardous environment at a low cost of production.

Claims (3)

1. A device for shutting off a gas flow in a cylindrical pipeline containing a shut-off unit structurally connected to a compressed air supply unit, characterized in that the cut-off unit is made in the form of a housing and a shutter mated to form a sealed channel filled with compressed air through its supply unit , the shutter is equipped with two semi-axes fixed in the housing oppositely, forming a single axis of its rotation from the open horizontal position to the closed working vertical position inside the pipeline and vice versa, and one of the semi-axes, rigidly connected to the shutter plane, is made with the possibility of receiving movement from the motor-reducer through the worm transmission, and the second semi-axis is provided with a bearing assembly, and all elements of the device in contact with the passed medium are made of a metal and/or alloy resistant to this medium. 2. The device according to claim 1, characterized in that the channel is U-shaped or └┘-shaped. 3. The device according to claim 1, characterized in that carbon or heat-resistant steel, or titanium alloy is used as the metal and/or alloy.

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