RU2244130C1 - Ventilation pipeline - Google Patents

Abstract

FIELD: mining industry.

SUBSTANCE: pipeline has sections made in form of hermetically interconnected outer and inner covers, mounted with space relatively to each other, and main ventilator. On different ends of pipeline flow meter and additional ventilator are mounted, the latter having adjustable characteristics and being connected to inter-pipe space by branch pipe. In inner cover apertures are made placed along radius and along length of cover. Air comes from apertures to air channel and forms additional air flow near walls of inner cover, which lowers or heightens aerodynamic resistance of ventilation pipeline.

EFFECT: higher efficiency, higher safety, lesser costs.

2 dwg

Description

The invention relates to the mining industry and can be used when ventilating workings of great length by the injection method using pipelines.

Known ventilation duct (AS.№411211, 7 E 21 F 1/04, 01/15/1974, bull. No. 2), including the outer and inner shells, a connecting lock, according to the invention, the inner shell at one end fixed in a connecting lock, and to others - it closes the subsequent joints of the links of the external pipeline. The disadvantage of this device is the inability to control aerodynamic drag and large air leaks.

Known thermally insulated flexible pipe (AS.№1242622, 7 E 21 F 1/04, 07/07/1986, bull, No. 25), adopted as a prototype. The essence of the invention is that in a thermally insulated flexible conduit containing sections made in the form of hermetically connected inner and outer shells installed with a gap one relative to another, according to the invention, sections of breathable fabric of equal area are made in each section in the outer and inner shells located one against the other. The disadvantage of this device is the inability to control aerodynamic drag and large air leaks.

Known pipelines consist of individual links 3-10 m long in rigid and 5-20 m in flexible pipelines, which in mine conditions are connected in a different way to each other. They are characterized by significant aerodynamic drag due to the roughness of the walls, as well as local resistances of a significant number of joints between individual links and air leaks at the joints and seams along the entire length of the pipeline. As the length of the mine increases, the amount of air required to supply the pipeline sharply increases due to increased leaks. It is known that with an increase in the flow rate of air passing through the ventilation pipe, the necessary pressure increases to overcome the resistance to air movement (in proportion to the square of the air flow rate). To create the necessary pressure or the necessary air flow, respectively, a series or parallel installation of fans is used. This causes additional energy costs for airing the output.

The technical result of the invention is to control the aerodynamic resistance of the ventilation pipe and reduce the number of leaks.

The technical result is achieved by the fact that the ventilation pipe containing sections made in the form of hermetically connected outer and inner shells, installed with a gap one relative to another, the main fan, according to the invention, is equipped with a flow meter installed at different ends of the pipeline and an additional fan with adjustable characteristics, a pipe connected to the annulus, and holes are provided in the inner shell located along the radius and length of the shell and.

The use of the proposed device in comparison with the prototype allows you to control the aerodynamic resistance of the ventilation pipe and reduce air leakage in the pipeline.

The ventilation pipe is illustrated by drawings, figure 1 shows a longitudinal section of a ventilation pipe, figure 2 is a transverse section of a ventilation pipe, where:

1 - outer shell;

2 - inner shell;

3 - struts;

4 - holes in the inner shell;

5 - pipe for supplying air into the annulus;

6 - additional fan with adjustable characteristics;

7 - flow meter;

8 - lock;

9 - the main fan.

The ventilation pipe includes an outer 1 shell, into which the inner 2 shell is placed and fixed relative to each other using spacers 3. Both edges of the shells 1 and 2 are secured with locks 8. Before placing the inner shell 2 in the shell 1, holes 4 are arranged in it with a radius and along the length of the pipeline. In the gap between the inner 2 and outer 1 shells, a pipe 5 is installed, to which an additional fan 6 with adjustable characteristics is connected. An additional fan 6 is installed at the same end of the pipeline on which the main fan 9 is installed. On the opposite side, a flow meter 7 is installed in the ventilation pipe. The additional fan 6 is received with an adjustable flow rate, and the flow of the additional fan 6 does not exceed the flow rate of the main fan 9.

The ventilation pipe works as follows. Air is injected into the inner shell 2 by means of a main fan 9 located at one of the ends of the ventilation pipe. At the other end of the ventilation pipe using a flow meter 7 measure the air flow. Then compare the available indicators with the design and determine the amount by which it is necessary to increase air flow. Then set the necessary mode on the additional fan 6 (forcing or suction of air). Air is fed into the gap between the inner 2 and outer 1 shells through the pipe 5 for supplying air to the annulus. Air enters through the openings 4 in the inner shell 2 into the air channel, creating an additional air flow at the walls of the inner shell 2. Thus, by pumping or supplying air into the cavity between the shells with the help of an additional fan 6 with adjustable characteristics, the aerodynamic resistance of the ventilation pipe is reduced or increased.

The use of a ventilation pipe provides the following advantages:

- control of the aerodynamic drag of the pipeline;

- reduction of air leaks in the ventilation pipe;

- use in mine workings located in sinking or cutting;

- improving labor safety;

- use in mine degassing systems;

- reduction of ventilation costs;

- the possibility of use in an explosive atmosphere.

Claims (1)

A ventilation pipe containing sections made in the form of hermetically connected outer and inner shells, installed with a gap one relative to another, the main fan, characterized in that it is equipped with a flow meter installed at different ends of the pipeline and an additional fan with adjustable characteristics connected to the annular space pipe, and in the inner shell made holes located along the radius and length of the shell.

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