SU1687026A3 - Mixing device for producing gas-powder suspension flow - Google Patents

Abstract

The invention can be used when applying a suspension to a product of the type of stained glass, moving relative to the device. The purpose of the invention is to increase the uniform distribution of the powder in a gas-powder suspension. For this mixture

Description

1

The tel device contains a mixing chamber 1 placed in front of the turbulence chamber, passing into the channel of the supply pipe 2, wherein the gas supply means is designed as a mixing chamber 1 placed at its entrance along its axis of the Venturi 6, and the powder supply means is in the form of a lateral inlet 7. The injector body consists of tubular parts 8, 9. adjacent ends to each other and having grooves on the inner surfaces of the adjacent ends to hold the feed pipe 2. The feed pipe 2 in the location area therein Mixing chambers 1 are made with a bore of a section diminishing in diameter, the diameter of which is equal to the diameter of the mixing chamber; surface toward the exit end and has a length of at least eight times the inlet inner diameter. The side inlet is connected to the upper part of the mixing chamber, which encloses the lower part of the Venturi tube b, and can be made tangentially positioned relative to the mixing chamber of the tip. 6 hp f-ly, 2 ill.

The invention relates to mixing devices for producing a stream of gas-powder slurry and can be used when applying said suspension to a stained glass substrate used relative to the device.

The purpose of the invention is to increase the uniform distribution of the powder in the gas-powder suspension.

Figure 1 shows the mixing device section; figure 2 - the upper part of the device, a section.

A mixing device for receiving a gas-powder slurry stream contains a displacement chamber 1 passing into the channel of the supply pipe 2 for supplying a mixture of gas and powder coaxially entering the turbulization chamber 3 to a height of a narrow cross section. The turbulization chamber 3 is made in the form of a pipe with section 4 narrowing into a cone, followed by a conical expanding section 5.

The mixing device also includes means for supplying primary gas, made in the form of a mixing chamber 1 at the inlet of the Venturi tube 6 along its axis, and means for supplying powder in the form of a side inlet 7. The mixing device comprises an injector covering the inlet pipe 2 8 and 9, adjacent to each other and having grooves 9 and 10 at the inner ends, respectively, for holding the inlet pipe 2. The annular cavity 11 of the injector concentrates the inlet pipe 2 and co schaets through an annular chamber formed by it and the tangential openings 12

with a peripheral gas pressure source.

The supply pipe 2 at the location of the displacement chamber 1 therein is made

with a bore 13, decreasing in diameter from section 14, the diameter of which is equal to the diameter of the displacement chamber 1, and for this purpose has an expanded head 15. The supply pipe is made with a conical decreasing outer surface 16 to the exit end and at least eight times the length inlet diameter.

The side opening 8 is connected to the upper part of the mixing chamber 1, covering the lower part 17 of the venturi. The side inlet 8 is made in the form of a tangentially placed relative to the camera 1 mix

tip 18.

The turbulence chamber 3, formed by the diffuser 19, has a cross section on the narrowing section 4 that is equal to the internal cross section of the tubular part 9, and its very narrow

Zone 20 has a section slightly exceeding the external section of the tubular section at its outlet end, and is located opposite the latter. It follows from this that a narrow annular

a gap for the passage of peripheral gas from the openings 12 to the expansion section 5 of the turbulization chamber 3.

In FIG. 2, the mixing chamber 21 is the inner space of a cyclone, the walls 22 of which enclose the venturi 6, which supplies the primary gas. In order to function, this cyclone has channels of sub-flow of gas streams (not shown). At its lower end, it is connected in the same way as in FIG. 1, with an injection step which remains unchanged.

A tip 23 for feeding the powder into the gas stream is placed above the cycle and oriented in a tangential direction relative to said cyclone obliquely relative to the Venturi tube. In known cases, the second stage of the cyclone is provided below part 17 of the Venturi tube. Under these conditions, walls 22 fall below the lower part 17 of the Venturi tube 6, and the tangential channels for supplying gas flows (not shown) in this case are placed through part of these walls 22 to power this cyclone.

These gas flow channels and the wall 22 are located so that they are on the circumference of the gas flow coming from the Venturi tube 6. Below the gas channels supplying this new cycle, the inner wall 22 of the mixing chamber is connected to the supply pipe 2.

The device works as follows.

Primary gas is injected into the venturi tube 6. Gas creates in the mixing chamber 1 or 21 a discharge, as a result of which powder is sucked from a dosing unit (not shown) through a pipeline (not shown) and a tip) 18 or 23. As the absorption is carried out at atmospheric pressure, the powder remains in non-crystalline and unconsolidated the way it was in the dispenser. Taking into account the flow from tip 18 and 23 to the section of mixing chamber 1 with a constant cross section, i.e. In the zone in which the gas flows are stabilized, there is no danger of stabilization of the outflow, as a result, homogeneity of the mixture of gas and powder is observed at this level of the device.

Therefore, the primary gas ensures a constant flow rate of the finely divided powder. As the feed pipe 2 progresses in the channel, the powder and the primary gas are intimately mixed to form a homogeneous suspension.

Then, the suspension is injected into the expanding section 5 with peripheral gas through the openings 12. When passing through the converging section 4 and the gas gap 23 into the expanding section 5, the suspension acquires an increased velocity, which may be the speed of sound.

A suspension, highly diluted with peripheral gas, is supplied to the product, which moves at a constant speed in front of the diffuser 19. The product is covered with a layer of powder or substance

the powder formed as a result of rdeloj.

In the case shown in Fig. 2, the device is connected to a cyclone, powder, which can be of different sizes, is subjected to a true sorting within the specified cyclone, with each category of particles moving along its path, and the heaviest particles fall into the widest ranges. trajectories.

At the moment of encounter of the flows of particles with gas coming at high speed from the Venturi tube b (in certain cases with

5 speed of sound), the particle trajectory is significantly disturbed, which leads to grinding as a result of blows to one another by the production of smaller particles.

When a cyclone is foreseen on

In the second level, particles that are not carried away by the gas flow coming from the Venturi tube 6, therefore, mainly large particles or agglomerates, fit, thanks to the first cyclone, into a wide

5, is subjected to a second cyclone, which leads to grinding.

The device allows to obtain suspensions with a constant nominal concentration with changes not exceeding 1% of the nominal concentration, and with increased injection costs in the order of 500-1000 MJ / 4. As primary and separation gases, as well as gas streams. Employing a cyclone coupled to a mixing device, air is usually used, but there may be any other gas, for example nitrogen.

The use of other gases, except for air, is convenient, since the consumption of suction is small. The proposed device allows to dilute small amounts of powder in large quantities of gas, guaranteeing uniformity of the mixture in each

5 cross section at the exit of the device in

any time, for example, the cost of leaving the device is in the order of 20-30 kg of powder

in a uniform suspension of 400 Nm of gas

are common.

Claims (7)

1. A mixing device for receiving a gas-powder slurry stream containing a turbulence chamber in the form of a tube, the internal cross section of which is The flow direction is made tapering to a cone, followed by a conical expansion, supplying a pipe for supplying a mixture of gas and powder, coaxially entering the turbulization chamber to a height of a narrow cross section of the supply means powder and gas, and an injector in the form of an annular cavity concentrically covering the supply pipe and communicating with a pressure source through an annular chamber and a hole, characterized in that, in order to increase the uniform distribution of the powder in the gas-powder slurry, the mixing device is designed with a turbulization chamber with a mixing chamber passing into the channel of the supply pipe, while the gas supply means is made in the form of a venturi tube located not at the inlet of the displacement chamber, and the powder supply means is a lateral inlet opening. 2. Pop-up device 1, characterized in that the injector body is made up of tubular parts, adjacent ends to one another and having grooves on the inner surfaces of the adjacent ends to hold the feed pipe. 3, a device in accordance with claims 1 and 2, characterized in that the supply pipe at the location of the mixing chamber therein is made with a bore, decreasing in diameter from the section, the diameter of which is equal to the diameter of the mixing chamber. 4. The device according to claims 1-3, is distinguished by the fact that the side inlet is positioned in the direction of the outflow of the primary gas, and its outlet end protrudes with respect to the outlet end of the Venturi tube, 5. A device according to claims 1-4, characterized by the fact that the inlet pipe is a pipe made with a tapered decreasing outer surface in the direction towards the outlet end and a length, at least equal to eight times the input inner diameter. 6. The device according to claim 1, wherein the lateral inlet is made in communication with the upper part of the displacement chamber, which encompasses the lower part of the Venturi tube. 7. The device according to claim 6, characterized in that the side inlet is made in the form of a tangentially positioned relative to the mixing chamber of the tip. eleven b 23 FIG. 2