Installation for blowing ventilation of dead working faces

FIELD: mining.

SUBSTANCE: installation includes fan, delivery line, inducing and water-spraying device installed on its end. Inducing and water-spraying device includes outlet head with annular outlet slot, receiver and compressed air supply nozzle. In order to increase energy use efficiency of compressed air owing to active mixing of inducing and induced jets, separation effect of inducing jet from convex surface is used in inducing and water-spraying device. Common air jet is passed through two-layer fine-meshed screen before it is emitted to atmosphere of mine working. In order to protect outlet slot against deformations, at HWL (high-water level) impact, inducing and water-spraying device is equipped with deformation-proof flange. Water supply nozzles to inner cavity of the main diffuser are installed on convex surface of the main diffuser at angles of 120 degrees to each other.

EFFECT: higher use efficiency of compressed air energy.

4 cl, 2 dwg

 

The invention relates to the field of mining industry and can be used for ventilation of dead-end faces of the mine workings.

Known device for injection airing dead end faces of mines [Ed. St. No. 661113, 1979, E21F 1/08], including local ventilation fan (VMP), injection pipe (NT) and ejecting-water spray device, consisting of a confuser, fitted with a venting screw (ring nozzle, made in the form of a profiled sleeve) with the receiver (with an internal annular cavity), the outlet slit formed through the gasket between the flange and the annular sleeve, a convex surface and fittings for compressed air and water.

Known for a series of dependent [Ed. St. No. 661113, 1979, E21F 1/08] modifications, for example, [Ed. St. No. 846757, 1981, E21F 1/08, Ed. St. No. 941617, 1982, E21F 1/08, Ed. St. No. 1167350, 1985, E21F 1/08], ejecting-water spray devices which contain the same details.

All known plants, namely their ejecting device suffers from two drawbacks: one is obvious; the second is hidden.

1. The discharge gap is in the vicinity of the slice discharge head (cut profiled sleeve) - side stub of the face. In the air stream moving inside the NT under the action of the FMP that have formed (that is bulentnba) plot speed, falls in the region of acceleration, caused partly by the narrowing of the cross section due to the presence of confuser, but mostly because of the vacuum in the discharge head due to peripheral expiration of compressed air from the outlet slit and loses the previous plot, because the speed of the internal walls of the exhaust head (ejecting speed of the jet) is many times higher than the rate on the flow axis (the speed of the ejected jet). To align the plot of the total speed of the jet over the desired area of the pipe (the mixing chamber) length not less than 3 meters (better diffuser) or hydrodynamic lattice in the flow path. All the known devices do not. Aerodynamically unformed stream immediately available in an open space development, which does not allow the coefficient of performance (COP) of the device to achieve a higher value by making the energy of compressed air for more work on the mixing of jets in the formation aerodynamically normal plot of speed before the release of the total flow in the atmosphere.

2. All known ejecting-water spray device (confuser with ejecting the nozzle and pipe for water supply) massive - 25-30 kg the Authors rightly believed that the massive device less susceptible to shock the air waves (UVV). Currently, the number in rawimage explosives (he), when drilling stub generation, up to 24 kg (10 kg) and UVV formed of such size, where beats outlet head on the wall of the excavation of the deformation of a thin (0.15 mm) exhaust cracks, which leads to uneven release of compressed air along the perimeter of the slit, for violation of concentric uniformity of the flow and, eventually, also to decrease the efficiency of the device.

The task of the invention is to increase the energy efficiency of compressed air by providing a hydrodynamic normalization plots the total speed of the jet produced in open space develop towards the dead-end face of thesis cracks from deformation when exposed to UVV by confuser rejection and use of profiled diffuser, equipped with protivodetonatsionnuyu the flange.

The problem is solved in that massive, but fundamentally unnecessary confuser refuse at all, and jet HT, accelerated by the negative pressure in the exhaust head, not released immediately into the atmosphere of the mine workings, and passed through the receiving cone, passing through the convex surface in the main diffuser provided at the output of a two-layer aerodynamic grid. The length of the receiving cone is chosen such that the entraining stream it managed to grow in the transverse size of the and the expense of air leaks from the jet HT to the size of the radius of curvature of the convex surface [Zelenetsky VA, Chirkov US ABOUT unseparated gas flow on a convex surface. / Journal of mining science, No. 1, 1989, S-79], then when moving on the surface of the jet separates the centrifugal force inside the jet HT, mixed with it in the main cone, and after passing the flow through a two-layer wind grid expire in the atmosphere with the hydrodynamically normalized (turbulent) velocity profile. Jet with monochromatic turbulent structure has a greater efficiency of energy use compressed air, than in the prototype and its dependent counterparts, as does a greater job of transferring energy and momentum from the entraining jet ejected to mainly the diffuser, the role of the mixing chamber.

Both the diffuser is equipped with flanges that connect by means of bolts through the rubber gasket. The outer diameter of the flange exceeds the external diameter of the discharge head. Thus, the connection represents protivodetonatsionnuyu the flange. The first blow against the wall framing from exposure to UVV on the device receives the flange, thereby protecting the discharge head with a thin slit prom from the strongest impact UVV.

The operational advantage of the proposed device is that it weighs 15 kg less than the mass of the device in A.S. No. 661113 primarily for accounts is not using confuser (to use the confuser is suitable only as a passive accelerator). As the main diffuser, you can use a standardized fire-fighting foam generator, the average multiplicity GPS-600 equipped with a flange.

The water in the inner cavity of the main cone, if necessary dust suppression at the bottom, flows through the fittings mounted on the convex surface at angles of 120 degrees to each other.

Mount HT to the proposed device is provided in the recess formed by the junction of the discharge head with the receiving cone.

Figure 1 shows schematically the proposed installation; figure 2 - node I.

The installation includes the fan 1, the pipe 2, the ejecting device 3 consisting of the discharge head and profiled diffuser. The discharge head is formed by bolting 4 flange 5 with the sleeve 6, containing an internal toroidal cavity 7 and the convex surface 8 through the gasket 9 for the formation of the outlet slit 10, and the discharge head includes a nozzle 11 and a pipe 12 for supplying compressed air into the cavity 7 and the retaining ring 13. Profiled diffuser formed by the serial connection of the receiving 14 and base 15 of the diffuser by means of screw connection 16 of the flanges 17 and 18 through a rubber gasket 19. The cone 15 has a convex surface 20 and includes a socket 21 for the supply of water in its internal cavity, and the grid 22. Established the e diffusers to the flanges and to the outlet of the cylinder is carried out by welding.

Installation for pressure ventilation stub faces is as follows.

Fresh air is sucked in from vozduhopodajushchej generation fan is supplied by pipeline to the bottom stub generation. Passing through the ejecting device, a jet fan undergoes acceleration caused by the discharge generated in the discharge head, expiring at high speed (up to 200 m/s) from the exhaust slots with compressed air. A thin jet of compressed air around the convex surface of the exhaust head, rushes into the receiving cone along its walls, podstava air from a jet fan and increasing in transverse dimension, reaches the convex surface of the base of the cone, it starts to round, but the radius of curvature of the convex surface is chosen such that when the centrifugal force tear parietal stream, discarding it inside a jet fan. Next, in the main diffuser both streams (ejecting - wall and the ejected - jet fan) actively mixed and passing through the multi-layer, fine mesh, fulfilling the role of hydrodynamic lattice, the total jet with monochromatic turbulent structure expire in space generation towards the dead-end face. This jet is the most stable and long-range.

The presence of three nozzles 21 which allows to organize the flow of water, which gives the most effective suppression of fine water-air mixture.

Use ejecting device at the discharge end of the vent pipe equivalent to a reduction of the aerodynamic drag, which allows to increase the flow rate of the air supplied to the slaughter, 1.5 or more times and, consequently, to increase the distance between the end of the pipe and slaughter.

1. Installation for injection airing dead end faces of excavations, including the fan, the discharge line, ejecting water spray device containing the discharge head with the annular outlet slot, the receiver and the socket for the supply of compressed air, which is installed on the discharge end of the pipe and serves to release the total flow in the atmosphere of excavation in the side of the dead-end face, characterized in that for the normalization plots the total speed of the jet ejecting water spray device includes two profiled diffuser formed by the serial connection of the reception and the main drivers, while receiving the diffuser passes through the toroidal convex surface in the main diffuser provided at the output of a two-layer fine mesh mesh, and the length of the receiving cone such that eject the dominant stream it manages to grow in the transverse size by drawing air from the jet discharge to the size of the radius of curvature of the convex surface, that provides separation jet ejecting from the convex surface, its garbage to the center of the stream and further mixing with the ejected jet in the inner space of the main cone.

2. Installation according to claim 1, characterized in that the entraining water spray device has protivodetonatsionnuyu the flange formed by the flanges and receiving primary diffusers connected through a rubber gasket, and the outer diameter of the flange exceeds the external diameter of the discharge head.

3. Installation according to claim 2, characterized in that the convex surface of the main diffuser installed at angles of 120 to each other fittings for the supply of water into the internal cavity of the main cone.

4. Installation according to claim 3, characterized in that the recess formed by the junction of the discharge head with an acceptance cone, attach the discharge pipe.



 

Same patents:

FIELD: construction.

SUBSTANCE: protective lock comprises a box with hinges, a rigid web mounted in box hinges with the possibility of rotation in the horizontal plane, a seal of elastic material arranged between the web and the face surface of the box, a mechanism of web rotation and a locking mechanism. The lock is also equipped with an additional seal made as a hollow ring with a source of compressed air. On an inner surface of the box there is a support platform. The additional seal is installed between the box and the web.

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FIELD: mining.

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2 dwg

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FIELD: mining.

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4 cl, 7 dwg

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7 cl, 11 dwg

FIELD: mining industry.

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FIELD: mining industry.

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2 cl, 4 dwg

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1 dwg, 1 ex

FIELD: mining industry.

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EFFECT: higher efficiency.

4 dwg

FIELD: mining industry.

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EFFECT: higher personnel safety, higher efficiency.

4 dwg

FIELD: mining industry, particularly ventilation of mines or tunnels during bauxite deposit development.

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EFFECT: increased efficiency and miner's safety due to changing pure and contaminated air mass flow within the boundaries of the block.

3 dwg

FIELD: mining industry, particularly to form venting system, which controls thermal mine conditions during combined mining.

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EFFECT: elimination of time intervals during venting system construction and mining performing, simplified people evacuation in emergency and possibility to use heat-exchanging mines for other purposes.

2 dwg

FIELD: mining, particularly to vent ore and rock mines.

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EFFECT: provision of independent operation, simplified structure, increased operational safety and reduced power inputs for mine venting.

1 cl, 1 tbl, 2 cl

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