RU2497578C2 - Air operated rotary accelerator - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention is intended for use in chemical industry, agroindustrial complex, construction, etc. Accelerator comprises material feeder, accelerating nozzle with rotary drive composed of two coaxial hollow inner and outer truncated cones with their larger bases set downward, inner cone being connected with said feeder. Nozzle tubes are arranged at nozzle lower part, inner tubes being connected to inner hollow truncated cone while outer ones are connected to outer truncated cone. Note here that circular air chamber is arranged above the nozzle with vertical pipes arranged in circular chamber between hollow truncated cones connected thereto. Note here that air direction blades are mounted at outer cone inner surface to feed air to outer radial nozzle tubes with outer conical ends.

EFFECT: efficient acceleration, simplified design and power savings.

2 dwg

Description

The present invention is intended for use in the chemical industry, agriculture, the production of building materials and other industries.

Known centrifugal liquid atomizer [AC 488622], consisting of a receiving chamber with radial channels, coaxially with which the nozzles for air intake are installed. During the rotation of the receiving chamber, the fluid moving in the channels accelerates under the action of centrifugal forces and air flows created by the nozzles for air intake. Despite the fact that this device is intended for spraying liquids, it can be used to form flows of solid particles.

The disadvantages of this device are the low speed of dispersal of particles and high aerodynamic drag caused by rotating intake pipes.

The closest in design to the proposed air-centrifugal accelerator is a continuous-action centrifugal mixer accelerator containing material loading devices, a rotary motion nozzle consisting of two coaxially arranged hollow, external and internal truncated cones installed with a large base down connected to the loading devices materials. In the lower part of the nozzle, there are radial coaxial nozzle tubes, the inner of which are connected to the inner hollow truncated cone, and the outer ones to the outer. The nozzle tubes are equipped with snail-shaped sampling devices, the inner side surface of which is conjugated with the outer surface, and at the interface the nozzle tubes are made perforated [AC No. 581979].

The disadvantages of this device include the low particle acceleration efficiency due to the small influence of the gas captured by the intake devices. When the nozzle with the protruding parts rotates, a rotating gas volume is created in the apparatus, and therefore, the velocity of the sampled gas in the channel is insignificant, slightly affecting the material flow.

The objective of the invention is the creation of a pneumatic centrifugal accelerator of bulk materials, allowing the particles to communicate the high speeds necessary for carrying out the processes, for example in apparatus for grinding solid particles.

The problem is achieved in that in a pneumatic-centrifugal accelerator containing a material loading device, an accelerating nozzle with a rotary motion drive, consisting of two coaxially located hollow, external and internal truncated cones installed with a large base down, the inside of which is connected to the material loading device and in the lower part of the nozzle there are radially coaxially mounted nozzle tubes, the inner of which are connected to the inner hollow truncated cone, and the outer - to the outside, above the nozzle there is an annular pneumatic chamber to which vertical nozzles are connected located in the annular cavity between the hollow truncated cones, and on the inner surface of the outer hollow truncated cone there are blades for directing air into the outer radial nozzle tubes, the outer ends of which have a conical shape.

Figure 1 presents a diagram of a pneumatic centrifugal accelerator.

Figure 2 shows a section A-A.

The pneumatic-centrifugal accelerator comprises a material loading device 1, an accelerator nozzle with a rotary motion drive 2. The accelerator nozzle consists of two coaxially located hollow, outer 3 and inner 4 truncated cones, mounted with a large base down. In the lower part of the nozzle, there are radially coaxially mounted nozzle tubes — internal 5 and external 6. On the inner surface of the external hollow truncated cone 3, blades 9 are installed for directing air into the external radial nozzle tubes 6. An annular air chamber 7 is placed above the nozzle, to which from below connected vertical pipes 8.

Pneumo-centrifugal accelerator operates as follows.

From the material loading device 1, material is fed into the internal volume of the truncated cone 4 of the rotating accelerator nozzle. Under the action of centrifugal forces, the particles of the material are pressed against its inner wall and enter the radial nozzle tubes 5. When the material moves in the radial nozzle tubes, it accelerates. To increase the speed of movement of the material, the particle stream exiting from the internal nozzle tubes is additionally affected by a high-speed satellite stream of air moving from the external radial nozzle tubes 6. Compressed air is supplied to the accelerator nozzle from the air chamber 7 through vertical nozzles 8. To direct the flow of compressed gas blades 9 are installed in the outer radial nozzle channels and to prevent its outflow through the upper part of the accelerator nozzle on the inner surface of the hollow truncated cone 3.

The execution of the outer ends of the nozzle tubes 6 of a conical shape prevents the shape of the flow of solid particles from breaking, their uncontrolled dispersion and contributes to their most efficient acceleration, that is, significantly increases their speed.

Due to this combination of centrifugal forces and high-speed satellite gas flows, the use of the proposed device allows particles to be dispersed to high speeds of the order of 70-100 m / s, for example, during grinding processes by interaction with the barrier, is a very important factor. Obtaining high flow rates from nozzle tubes of liquids results in droplets of small sizes. Thus, the air-centrifugal accelerator is a multi-purpose device.

The use of compressed air flows during acceleration significantly reduces the power consumed by the device compared to centrifugal accelerator devices.

The proposed air-centrifugal accelerator has a relatively simple design and, with high particle acceleration efficiency, consumes a small amount of energy.

Claims (1)

A pneumatic centrifugal accelerator comprising a material loading device, an accelerating nozzle with a rotary motion drive, consisting of two coaxially located hollow, external and internal truncated cones installed with a large base downward, the inside of which is connected to the material loading device and radially coaxially mounted at the bottom of the nozzle nozzle tubes, the inner of which are connected to the inner hollow truncated cone, and the outer ones to the outer one, characterized in that above adkoy arranged annular pneumatic chamber, to which are connected vertical tubes arranged in the annular space between the hollow truncated cone, wherein the inner surface of the outer hollow truncated cone mounted blades for guiding air into the outer radial nozzle tube, which outer ends are tapered.

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