SU1323494A1 - Charging arrangement of vacuum pneumatic transportation unit - Google Patents

Abstract

The invention relates to pneumatic conveying, in particular, to vacuum selection of bulk materials from a multi-bunker system to one transport conduit, and can be used in thermal power plants with dry removal of ash from electrostatic filter hoppers, as well as in construction, chemical, metallurgical and other industry The purpose of the invention is to increase the reliability and ease of operation. The invention makes it possible to increase the reliability of operation and ease of operation of the vacuum system when selecting bulk material by one transport pipeline from several bunkers without unproductive air suckers from emptied containers by self-discharging unloading when the material level is below the permissible limit. The use of an actuator made in the form of a conical valve with seals on the base of a cone having a gap with the chamber walls provided with a thrust and face stop at the level of zero rotational moment of the compression spring eliminates the retention of material particles in the chamber and jamming of the actuator, facilitating shutdown bunker on the material, to ensure the unambiguity of the provisions of "open - closed. 1 3. п. Ф-л, 6 Il. S with oo ND CO 4 CO II

Description

The invention relates to pneumatic conveying, namely to vacuum collection of raw materials from a multi-bunker system to one transport material pipe, and can be used in thermal power plants with dry removal of ash from the hoppers of electrostatic filters, as well as in construction, chemical, metallurgical and other industries.

The purpose of the invention is to increase the reliability and ease of operation.

FIG. 1 is a schematic diagram of a vacuum pneumatic conveying installation; in fig. 2 — node I ka of FIG. one; in fig. 3, section A-A in FIG. 2; in fig. 4 - section bb pa fig. 2; in fig. 5 — node AND in FIG. 2; in fig. 6 — node III in FIG. 2

Vacuum pneumatic installation includes a vacuum pump 1, suction 2 and transport 3 pipelines, a precipitation chamber 4 with a fine filter 5, an adjustable air intake manifold 6, a combined air-gravity trough 7 connected to bunkers 8 discharge devices 9, each of which contains an inlet 10 and outlet 11 nozzles, a conical valve 12 connected pivotally through the axis 13 to the first 14 and second 15 levers, of which an adjusting counter load 16 and a hinge bar 17 of the release springs are fixed to the end of the first lever 14 18 with a hinge 19 mounted on the chamber 20 adjoining it; it is connected to the inlet 10, and the end of the second lever 15 is connected through the spring 21. to the second conical valve 22 and has a connecting link with a pull 23. The conical valve 22 is placed in camel 20 with a gap of –5 °; (0 | –D2), allowing unhindered passage of the largest particles of the transported material. The lower chamber outlet 20 is connected with the air-gravity trough at a distance from the unloading port and in the course of the material movement, and the upper part of the chamber 20 is connected with the internal cavities of the prismatic dividers 24, having slots 25, unstressed bases 26 (FIG. 4) and a chop wall 27. To limit the stroke of the check valve 12 when the device is opened, an adjustable stop 28 is fixed on the chamber 20. The conical valve 22 is equipped with seals 29 made of elastic material (for example rubber) and fixed at the base of the cone screws 30. T he 23 is located eccentrically to the axis of symmetry of the chamber and at one end is pivotally connected to the conical valve 22, and at the other end has an end stop 31 adjusted so that when the camera 20 is completely turned off by valve 22 the axis of the lever 15 is at the level of H- H, i.e. on the line of zero rotational moment of the ground spring 18. To the top of the chamber 20

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A compressed air conduit 32 is connected with shut-off and control valves 33. To seal the chamber 20, the axis 13 is provided with seals 34. The air-gravity groove contains a conduit 35 under discharge P to which the outlet nozzles 11 and the bottom outlet are attached. , an air-permeable barrier 36 and an air passage 37, communicated via the nozzle 38 with the atmosphere.

The loading device of the pneumatic conveying vacuum installation works as follows.

In the initial position, with the hoppers 8 fully loaded and the vacuum pump i disconnected, two states of mouths are possible. Reystva 9 - open (“O) and closed (“ 3). When the "O" position is affected by the pressure of the bulk material, the cone valve 12 is moved to the lowest position, the lever 14 rests on the stopper 28 and is fixed by the release spring 18. The position indicator on the counterweight 16 is set to "O. The lever 14 is rigidly connected through the axis 13 to the lever 15, which is maximally lifted together with the conical valve 22 and the pulley 23. The conical valve 22 is suspended on the spring 21 in such a way that the stopper 28 per ton 23 does not abut against the lever 15. The input 10 and outlet 11 nozzles and part of the pipeline 35 under the nozzle 11 are filled with material. In the event of a shortage of material pressure on the conical valve 12, which is possible with slow filling of the hopper 8 and creating conditions for material compaction and formation of arches, in the upper part of chamber 20 through line 32 opening compressed air 33 from the compressor is supplied with pressure. P. Air through slots 25 and unobstructed bases 26 in hollow prismatic dissectors 24 enters the bunker, destroys the vaults, aerates the material and gives it flow properties. After closing the valve 33 and relieving the pressure in the chamber 20 on the cone valve 22 under the action of the fluidized material, the device takes the position "O (open)." When the vacuum pump 1 is turned on, the system creates a vacuum, as a result of which air enters the transport pipeline 3 in two streams: from the atmosphere through an adjustable intake manifold 6 and through the air-gravity gutter 7 (in the sequence: from the atmosphere through nozzle 38 through the air inlet channel 37 through an air-permeable barrier 36, a layer of transported material, through a conduit 35). The material, liquefied by the second air flow, enters the air-gravity transport mode via the material conduit 35 into the transport conduit 3, which is fed into the settling chamber 4 in the pneumatic transport mode. Exhaust air is fed through a filter 5

fine suction pipe 2 with a vacuum pump 1 is released into the atmosphere. Selection of material from the bunkers through the airgravity trough is made primarily from the open discharge device, the farthest from the pipe 38. When the material in the operated bunker reaches the section B-B, due to the pressure difference (RS-D), air flows from the bunker to uncoupled the base 26 in the cavity of prismatic dividers 24 through the slits 25 above the chop wall 27 into the upper part of the chamber 20. Under the influence of air flow, the conical valve 22, moving downwards, drags the spring through the spring 21 r release lever 15, which through the axis 13 rotates counterclockwise the lever 14, the spring 18 works in compression after reaching the lever 14 to the position of H-H. The conical valve 12 moves up and after passing the neutral H – H position under the action of the spring 18 unambiguously overlaps the inlet 10. At the initial stage of locking the device, it is possible to trap particles of material with overcoming the height of the chop wall 27 and penetrating the upper part of the chamber 20. Between the conical the valve 22 and the walls of the chamber 20 have a gap - (- Da) capable of letting the largest particles of the transported material fall through the bottom of the chamber 20 into the lower part of the chamber 20. oprovod 35. During the final stage locking cone valve 22 occupies the lowermost position, the conical valve 12 - uppermost, holding the unfiltered material layer at section B-B, counterweight 16 - at position "3 (closed). Air pushes from chamber 20 into the system are excluded by seals 29 and 34. After the residual material from the outlet nozzle 11 and in the material pipeline 35 under the nozzle 11 is exhausted, the filtration zone through the air-permeable barrier 36 spreads to the outlet outlet higher in the groove, through which starts emptying the next bunker. Thus, a complete suction is carried out from all silos of the bulk material with sealing of the empty silos. Depending on the characteristics of the bulk material (density, filtration coefficient, etc.), the balancer of the discharge device is made by adjusting the magnitude and position of the counterweight 16.

Opening the device in the presence of vacuum occurs in the following sequence. Under the influence of the weight of the material in the hopper on the conical valve 12, the levers 14 and 15 are rotated on the axis 13 clockwise, overcoming the force effects of the counter-load 16, the compression springs 18 and the extension 21, and the conical

valve 22 is sucked in and still. As the levers 14 and 15 reach the neutral (relative to the spring) H – H position, the lever 15 acts on the 5 end stop 31 through the pull 23 and creates a skew and a gap in the seal 29 of the conical valve 22, through which the pressure in the upper and lower ends the lower parts of the chamber 20, as a result of which 21 raises the conical valve 22 and the tug 23 in the arm of the lever 15. A further turn of the levers 14 and 15 accelerates the decompression of the spring 18 to the counterbalance position “O” and the subsequent abutment of the lever 14 into the stopper 28. T . when the upper limit is reached in the 5pax bunker, both when the vacuum system is running and when it is stopped, the cone valve 12 is automatically opened. If it is necessary to quickly shut off the material, it is sufficient to open the valve 23 and supply compressed air to the upper part of the chamber 20.

Claims (2)

1. A loading device of a pneumatic conveying vacuum unit comprising 0 a bunker with an outlet nozzle, a chamber with a lower outlet nozzle, which is connected to the hopper, conical valves, one of which is installed upright in the outlet nozzle along the axis of the latter and is hinged by means of the first lever with a release spring and counterload with position indicator, and by means of a second lever, with an actuator, wherein the second conical valve is placed in the chamber and the joint is connected with the first conical valve, characterized in that, in order to increase reliability and convenience, The chamber is communicated with the hopper through a branch pipe and is provided with a lower branch pipe coaxially discharging it, mounted at a distance from the lower outlet branch pipe of the chamber in the direction of transport, while the second conical valve is positioned above the bottom branch and the hinge connection of the second conical valve is 0 by itself, mounted eccentrically with respect to the axis of the outlet nozzle, and is connected by a slide with the second indicated lever, equipped with an end stop. 2. Device by. 1. characterized in that 5 that the outlet of the chamber is provided with a clamp for supplying compressed air, while the bunker is provided with hollow prismatic dividers communicated with each other with unplugged bases. Fy J 3S 37 2g -BUT 13 (rig.s 2 Srig. 29 FIG. five sh 23 jr Compiled by E. Guchkova Editor M. PetrovTehred I. VeresKorrektor L. Patay Order 2926/26 Circulation 777 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4 FIG. at