Ejector feeder of delivery pneumotrasnsport plant

FIELD: transportation of loose materials.

SUBSTANCE: proposed feeder contains rectangular section confuser-diffuser housing with feed port in zone of mating of its confuser and diffuser parts. Charging funnel with control gate arranged in lower part of funnel is placed over feed port. Hosuing is connected by its confuser and diffuser parts with confuser and diffuser which are connected, accordingly, with air duct and material duct of plant. Louver grating is arranged in housing over its entire width under feed port in diffuser part, louver slats being tilted in direction of transportation of material. Turnable valve is installed for turning on end part of louver grating over entire width of housing.

EFFECT: reduced losses of air pressure for accelerating particles of material to be transported after its delivery into feeder, reduced specific power losses of pneumotransport plant.

2 cl, 1 dwg

 

The invention relates to a device for pneumatic transport of loose fine-grained materials (e.g., grain) and can be used in agricultural production, milling and grain Elevator and feed mill industry.

One of the simplest feeders for feeding material into the injection pneumatic conveying installation is mine shutter [1]. It is a set over materialsprovided install pipe (mine) rectangular or circular cross-section, which is fixed hopper. The flow area of the pipe is covered cargo valve, if the material in it falls below the estimated height of the axis of rotation of the valve, thus sealed by the insertion of material in materialprobe, i.e. prevents the escape of air in the atmosphere.

Mine closures inherent in simple design, they do not cause crushing of the particles, they have no drive, and unloading of material from bins mine has a small height. The main flaw of mine closures is the high altitude of the mine and, therefore, the layer of material to prevent its emission and dust environment. In addition, after working in the mine gate is a certain amount of transported material.

To enter the material in the discharge of pneumat unsporty installation used drum lock feeders, consisting of a cylindrical body having a nozzle for removal of excess air, aerated (or blade) of the rotating rotor and end caps [1, 2]. Case feeder has a window for input of material into the rotor and the window for submission of material in materialprobe installation. The rotor of the feeder in rotation is provided through gearing by an electric motor. This feeder is fairly evenly introduces the material into the machine, but the feeder inherent design complexity, relatively high material and energy intensity, some grinding particles of conveyed material (due to their wedge between the rotor and housing), and the release portion of the air from materialprivate ("recovery" emptied cells rotor).

Known ejector feeder consisting of a body of rectangular cross section; confused transition pipe connecting the air duct attached to the fan housing; a diffuser of the reducer connecting the housing with materialsprovided installation [1]. In the upper part of the housing has a window, which is fixed to the hopper. The input part of the body is confused, the output part of the diffuser. When operating the pneumatic installation due to the decrease of the living section in the confused part of the body, the static pressure of the charge air is converted to the kinetic energy (dynamic pressure). Due to this, in the case under the window boot creates negative pressure and the material to be conveyed under its own gravity is introduced into the body, in its diffuser portion is caught by the air stream, and then attached to the body of the diffuser transition pipe and materialprivate accelerates to steady values of speed and transported to the place of unloading.

Ejector feeders have no moving devices, i.e. they are simple in design and service, small and fairly reliable in operation.

The technical nature and essential features ejector feeder closest to the claimed ejector feeder and he adopted for the prototype. The disadvantage of ejector feeder are large pressure loss in the acceleration of particles to velocities required for their sustainable movement in materialprivate the pneumatic installation. This disadvantage is due to the fact that enter in the ejector feeder particles under the action of gravity comes mainly at the bottom of the housing and then move focus in its lower part. When the value of the permissible velocity of the air in materialprivate in pneumatic conveying installations (e.g. on the basis of conditions no damage to the particles of the material), the value is their lifting force, acting on particles from the air, a little, and their number in the direction from the bottom of the ejector to its upper surface is sharply reduced. In such a distribution of particles of material in the body of the ejector and, consequently, in the initial part of materialprivate increases their path of movement to a speed values, ensuring their sustainable transportation. If there is insufficient air speed in the air system installation formed a blockage of the ejector housing or the initial phase of materialprivate. This phenomenon can be avoided by increasing the speed of air flow, but at the same time, as already noted, there is damage to the particles of the material and significantly increases power consumption to drive the fan (as it is known, it is proportional to the third degree air speed).

The problem to be solved is to improve the health and enhance the reliability of the feeder and thereby pneumotransport installation. This problem is solved due to the uniform distribution of the injected particles of material on the casing ejector feeder, and hence the height of the initial phase of materialprivate. This reduces the pressure loss of the air flow to disperse the particles and to prevent blockage of the hull and the initial phase of materialprivate PR is smaller than the value of the flow velocity of the air.

The task for the pneumatic injection setup is solved using the proposed ejector feeder in which the feed box housing throughout its width set louvred grille [3], on the end portion which is at an angle to its plane across the width of the hinge housing to rotate a fixed rotatable valve.

Scheme ejector feeder pressure pneumatic conveying installation shown in the drawing.

Ejector feeder pressure pneumatic conveying installation consists of a rectangular casing 1, the input of which is made confused, and the output part of the diffuser. The upper part of the housing 1 has a supply box 2, placed in the zone pairing confused and diffuser parts of the body. Above the window 2 set the hopper 3, the bottom of which there is a regulating valve 4. Input (confused) part of the housing 1 confuser 5 is connected to the duct 6, which, in turn, connected to a fan (not shown). Output (diffuser) of the chassis 1 diffuser 7 is connected to materialsprovided 8 installation. Inside the case 1, under the supply box 2 and the diffuser part of the body 1 along its width posted by louvred grille 9, blinds 10 which is inclined in the direction of the protractor is of material. On the end portion louvred grille 9 (point O) across the width of the hinge housing 1 to rotate a fixed rotatable valve 11.

The process of working ejector feeder proceeds as follows. From a feed hopper 3 to be transported material during installation of the adjusting valve 10 in the open position through the feeding box 2 is inserted into the housing 1. At the same time, the air flow from the duct 6 confuser 5 is introduced into the housing 1 and the effect on the flowing particles. When this air flow, meeting on his way louvered grill 9 and the rotatable valve 11, is divided into three parts. The upper part of the flow, moving between the louvered grill 9 and the upper part of the housing 1, the effect on the input it particles and moves them in the direction of transportation. The middle part of the air flow, a part of the wedge-shaped space formed by a louvered grill 9 and the rotatable valve 11, out of this space in the form of jets through the holes louvred grille 9, educated her blinds 10. Under the influence of the kinetic energy of the jets coming on the louvered grill 9 material is in a fluid state, thereby increasing the "blow off" the effect of the first part of the flow of air to the material to be conveyed in adreset the ω space. The third part of the flow of air moves through the space formed by the lower part of the housing 1 and the rotatable valve 11 acts on the particles of the material coming from the louvered grating 9, and thereby prevent it from entering the lower part of the diffuser 7 and materialprivate 8.

With such a "combined" effect of air flow on the material to be conveyed its particles are uniformly filling the inner space of materialprivate 8. Thanks to this, they are accelerated to the value of a stable speed of transportation for less travel, which would reduce the pressure loss of the air flow to disperse particles of the material. In addition, when the influence of air flow on the material to be conveyed in a pneumatic feeder installation eliminates the formation of a blockage in it and in the zone of the pneumatic system adjacent to the feeder at a lower speed air flow, resulting in reduced energy costs for transportation of the material.

The throughput of the feeder, and thus the pneumatic installation varies with the adjustment of the valve 4, and a more uniform distribution of the particles along the height of the housing 1 of the feeder, the diffuser 7 and the initial part of materialprivate 8 is achieved by throttling the led of air per unit of time under the louvered grill 9 change the position of the rotatable valve 11.

Thus, by an ejector feeder reduces the pressure loss of the air flow to disperse particles of conveyed material to the value of the velocity of providing sustainable movement that, in turn, causes a reduction in the unit cost of energy by pneumatic transport installation. An additional effect is achieved through better use of working time by eliminating blockages ejector feeder, cone and materialprivate the pneumatic installation.

Literature

1. Zuev F.G. Pneumatic transportation to processing companies. - M.: Kolos, 1976. - 344 S.

2. The Ievlev N.A. Operation of pneumatic systems in wood-processing enterprises. - M.: Forest industry, 1982. - 215 S.

3. Blokhin of PV Aeroginosa for transportation of grain. - M.: Kolos, 1981. - 111 S.

1. Ejector feeder pressure pneumatic conveying installations containing rectangular case, the input of which is made confused, and the output part of the diffuser; the supply box, made on the upper part of the body, in the zone pairing him confused and diffuser parts; hopper with an adjusting valve, located above the feed box; the confuser and diffuser connecting the chassis, respectively, with Vostokova the om and materialsprovided pneumatic transport installation characterized in that in the case under the supply box and the diffuser part of the body throughout its width set louvred grille, at the end of which the full width of the hinge housing to rotate a fixed rotatable valve.

2. Ejector feeder according to claim 1, characterized in that the shutters louvered grille is tilted in the direction of transportation of the material.



 

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4 dwg

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SUBSTANCE: proposed device contains service tank with two valves. Upper valve of service tank is normally open, and lower one is normally closed. Tubular shanks are connected coaxially and hermetically to lower surfaces of each valve. Each shank is installed for vertical shifting onto corresponding outlet end of pipe for impulse delivery of gas. Hydraulic restrictor is installed at outlet end of pipe for impulse delivery of gas.

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