CN202558270U

CN202558270U - Compressed-air powder feeder

Info

Publication number: CN202558270U
Application number: CN2012202408064U
Authority: CN
Inventors: 杨振
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-05-26
Filing date: 2012-05-26
Publication date: 2012-11-28
Anticipated expiration: 2022-05-26

Abstract

The utility model relates to a compressed-air powder feeder capable of continuously feeding powdery particles into a pressurizing vessel, which includes a pressure air source, a laval spray pipe, a feeding section, a diffusing section and the pressurizing vessel that are sequentially connected. The static pressure in the feeding section is equal to the ambient atmospheric pressure, and the powdery material enters the feeding section just under the action of gravity. Meanwhile, the equipment can prevent tempering phenomenon in certain applications, and avoids the use or reduces the use of inert gases.

Description

The powder feeding machine of calming the anger

Affiliated technical field

The utility model relates to the pay-off in a kind of chemical industry energy mechanical equipment, especially can in pressurizing vessel, give the pay-off of powdered granule thing continuously.

Background technology

At present, known is that the strength delivery injector of injection medium is made up of main jet, receiving chamber, blending box and diffuser chamber with the powdered granule solid.The air that from nozzle, flows out with very high flow velocity hauls powder material and follows oneself and advance together; And pass to it to a part of kinetic energy of oneself; Air and powder mixtures of material get into blending box, the equilibrium of fluid velocity field here takes place, and make pressure that raising arranged slightly; Thereafter this compound gets into diffuser, and fluid pressure is further improved.But the pressurization effect of this type of eductor is also not obvious, is difficult to realize the requirement of feeding in high pressure vessel.The blending box air-flow operates in the subsonic velocity condition in the eductor, under some occasion, can make equipment can only adopt unreactable gas to be used as working medium because of " tempering ", and this has also increased operation cost.

Summary of the invention

Can not realize big supercharging and " tempering " problem of itself thereof in order to overcome existing eductor, the utility model provides a kind of powder feeding machine of calming the anger.This utility model can not only be given the powdered granule thing continuously in high pressure vessel, and can overcome " tempering " problem and need not to use or decrement is used unreactable gas.

The utility model solves the scheme that its technical matters adopted: pressure gas source, Laval nozzle, feed stage, diffuser, pressurizing vessel link to each other successively, and the material inlet opening is at feed stage.Gas in the pressure gas source gets into feed stage through behind the Laval nozzle, and differential pressure is low to moderate ambient atmosphere pressure, and speed surpasses the velocity of sound.Powder material by gravity gets into feed stage from material inlet, and along with air-flow continues motion.Air-flow forms normal shock wave at diffuser, and pressure obviously raises, and speed is reduced to below the velocity of sound.Get in the process of pressurizing vessel at air-flow, pressure further raises, and speed also further reduces.Through using Laval nozzle to make the feed stage differential pressure, and make air-flow velocity surpass the velocity of sound to ambient atmosphere pressure, this make the powder material only by gravity directly get into feed stage and need not other pneumatic transport equipment.Simultaneously, supersonic air-flow has prevented that also the combustion reaction in downstream from upstream spreading.In some cases, make the temperature of feed stage too high, so that powder react and cause " tempering " then near material inlet such as the big pressure ratio of source of the gas air compressor.At this moment, can let the powder feed path be in the inert gas atmosphere, to overcome the generation of " tempering ".Because not being powder, unreactable gas do not supply with power resources, so the relative prior art scheme of its use amount greatly reduces.

The beneficial effect of the utility model is: can in high pressure vessel, give the powdered granule thing continuously, and can overcome " tempering " problem and need not to use or decrement is used unreactable gas.

Description of drawings

Fig. 1 is the schematic diagram of structure of the utility model.

Fig. 2 is a kind of scheme implementation figure of the utility model.

Fig. 3 is the theory relation figure of stagnation pressure in feed stage air-flow velocity and the pressure gas source.

Fig. 4 is the theory relation figure that does not add stagnation pressure and the interior stagnation pressure of pressure gas source in the pressurizing vessel under the powder situation.

Label implication among the figure: 1. pressure gas source, 2. Laval nozzle, 3. feed stage, 4. diffuser, 5. pressurizing vessel, 6. material inlet, 7. feed controller, 8. normal shock wave, 9. feed pipe, 10. air compressor, 11. temporary warehouses.

Velocity of sound unit is Ma (Mach) among Fig. 3,4, and pressure unit is atm (standard atmosphere).

The specific embodiment

In Fig. 1, pressure gas source (1), Laval nozzle (2), feed stage (3), diffuser (4), pressurizing vessel (5) link to each other successively.Laval nozzle (2) end outlet flow field is a straight, flow, and air-flow operates in supersonic speed in the feed stage (3), and static pressure equates with environment atmospheric pressure.Normal shock wave (8) is controlled in the diffuser (4).Material inlet (6) opening is in feed stage (3), and feed controller (7) is controlled the flow rate of powder.Feed pipe (9) towards making powder can fall into feed stage (3) smoothly.

In embodiment shown in Figure 2, adopted centrifugal compressor (10) forced air as pressure gas source (1).On supply pipe (9), settled temporary warehouse (11).Piling up in the warehouse (11) temporarily has a certain amount of powder, and this can play certain sealing effectiveness, to reduce the influence that the fluctuation of feed stage (3) internal pressure produces continuous-feeding stability.The relation of the interior air-flow velocity of feed stage (3), the interior stagnation pressure of pressurizing vessel (5) and the interior stagnation pressure of pressure gas source (1) is referring to Fig. 3 and Fig. 4.

Claims

1. powder feeding machine of calming the anger, pressure gas source, feed stage, pressurizing vessel are linked in sequence, and it is characterized in that: link to each other with Laval nozzle between pressure gas source and feed stage, link to each other with diffuser between feed stage and pressurizing vessel.

2. the powder feeding machine of calming the anger according to claim 1 is characterized in that: the feed stage inwall is connected with the Laval nozzle inner wall smooth, and its cross-sectional area is identical with the Laval nozzle end with shape; Sectional area is smooth and gently increase in the diffuser.

3. the powder feeding machine of calming the anger according to claim 1 is characterized in that: it is the supersonic speed straight, flow that the parameter designing of Laval nozzle satisfies its end outlet flow field, and static pressure equates with environment atmospheric pressure in the feed stage; The parameter designing of diffuser satisfies normal shock wave and is stabilized in the diffuser.