CN114682404A - An external swirl cross-hole injector - Google Patents

Abstract

The invention discloses an external rotational flow cross hole ejector, belonging to the technical field of ejectors, comprising: the body is provided with a first cavity, a third cavity and a second cavity, wherein the first cavity and the third cavity are arranged up and down, and the second cavity is arranged on the periphery of the first cavity and the third cavity; the first cavity and the third cavity are communicated through a first channel; an injection cylinder is arranged between the second cavity and the third cavity, and a plurality of second channels communicated with the second cavity and the third cavity are arranged on the injection cylinder. The ejector with the crossed holes can be used for enhancing the effect of crushing, atomizing and mixing the fluid; high-disturbance cross spray holes are adopted, so that disturbance can be effectively enhanced, and spray crushing and atomization are promoted; meanwhile, the second fluid with rotational flow is shot to the fluid first cavity at high speed, is mixed with the first fluid, enhances the mixing and assists the atomization of the first fluid; the sprayer provided by the invention can effectively improve the fluid mixing uniformity, the spray particle size is reduced by more than 25% under the same spray pressure, and the fluid evaporation, atomization and mixing efficiency is improved by more than 50%.

Description

An external swirl cross-hole injector

technical field

The invention belongs to the technical field of ejectors, in particular to an external swirl cross-hole ejector.

Background technique

The ejector is used in many kinds of spraying, spraying, oil spraying, sandblasting, spraying and other equipment, plays an important role, and is a very critical component that affects the effect of fluid atomization.

Injectors are widely used in the industry:

For example, in the process of in-cylinder fuel atomization in the field of internal combustion engines, the atomization effect of fuel has a great influence on the fuel combustion effect, which directly affects the emission of pollutants. With the increasingly stringent national emission regulations, the requirements for fuel injectors are becoming more and more stringent.

For example, in order to reduce the NOx emission in the engine aftertreatment system, the reducing agent is injected into the exhaust gas, mixed with NOx, and then reacted in the SCR system to reduce the emission. However, the atomization effect of the reducing agent needs to be improved, and there is a problem of crystallization.

For example, the mixed gas of trichlorosilane and hydrogen in the field of polysilicon production enters the furnace cavity of the reduction furnace through the mixed gas nozzle, and the reaction is completed under high temperature and high pressure, and the generated silicon is deposited on the silicon mandrel.

However, in the process, unqualified polysilicon will be generated, and in severe cases, the phenomenon of melting silicon such as burning will occur, which greatly reduces the appearance quality of polysilicon and is not conducive to product handling and sales.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problems, the present invention has adopted the following technical solutions:

An external swirl cross-hole injector, comprising: a body having a first cavity and a third cavity disposed up and down, and a second cavity disposed on the periphery of the first cavity and the third cavity cavity;

The first cavity and the third cavity are communicated through a first channel; a spray cylinder is arranged between the second cavity and the third cavity, and a plurality of spray cylinders are arranged on the spray cylinder A second channel connecting the second cavity and the third cavity.

Further, the first channel is at least one shunt and confluence channel, wherein the shunt part is arranged on a side close to the first cavity.

Further, the longitudinal cross-sectional shape of the first channel is one of a tapered type, a gradually expanded type, a tapered and expanded type, or a tapered and tapered type.

Further, the first channel is a single-hole channel, and the single-hole channel is a straight cylindrical circular hole.

Further, the center line of the second channel and the radial section of the spray cylinder are inclined, and the inclined angle is 0°≤A<arcsin(R1/R2), where R1 is the diameter of the spray cylinder. Inner diameter, R2 is the outer diameter of the spray cylinder.

Further, the inclination angles between the centerlines of the plurality of second passages and the radial section of the spray cylinder are the same or different.

Further, the angle β between the centerline of the second channel and the axis of the injection cylinder is β, wherein the angle β between the centerline of the second channel and the axis of the injection cylinder is a right angle or a non-right angle, and The centerlines of the plurality of second passages are the same or different from the included angle β of the axis of the spray cylinder.

Further, the longitudinal cross-sectional shape of the second channel is one of a straight cylinder type, a tapered type, a gradually expanded type, a tapered and expanded type, or a gradually expanded and tapered type.

Further, the longitudinal cross-sectional shape of the spray cylinder adopts an outwardly expanding "eight" shape.

Beneficial effects:

The present invention provides an external swirl cross-hole injector. First, the injector with cross holes can be used to enhance the effect of fluid fragmentation, atomization and mixing; At the same time, the second fluid with swirling flow is shot to the first fluid cavity at a high speed, and is mixed with the first fluid to strengthen the mixing and assist its atomization; thirdly, the injector provided by the present invention can effectively improve the Fluid mixing uniformity, under the same injection pressure, the spray particle size is reduced by more than 25%, and the fluid evaporation, atomization and mixing efficiency is increased by more than 50%.

At the same time, compared with the prior art, the turbulent flow disturbance inside the nozzle hole of the ejector can be strengthened to obtain better mixing and ejection characteristics. The high-speed swirl of air outside the ejector assists the atomization and mixing of the spray, which can further increase the evaporation heat of the spray. solution speed.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the external swirl cross-hole injector of the straight cylinder type injection cylinder;

Fig. 2 is the structural schematic diagram of the external swirl cross-hole injector of the figure-eight injection cylinder;

Figure 3 is a schematic diagram of the structure of the external swirl cross-hole injector with β<90;

4 is a schematic cross-sectional view of the second channel using a straight cylinder type;

5 is a schematic cross-sectional view of the second channel using a tapered type;

6 is a schematic cross-sectional view of the second channel using a gradually expanding type;

7 is a schematic cross-sectional view of the second channel adopting a tapered and tapered expansion type;

8 is a schematic cross-sectional view of the second channel using a gradually expanding and tapering type;

9 is a schematic cross-sectional view of the second passage hole using a straight cylinder type;

10 is a schematic cross-sectional view of the second channel using a straight cylinder;

11 is a schematic cross-sectional view of the first channel being a straight cylinder type;

12 is a schematic cross-sectional view of the first channel being a straight cylinder type;

13 is a schematic cross-sectional view of the first channel being a tapered type;

14 is a schematic cross-sectional view of the first channel being a gradually expanding type;

15 is a schematic cross-sectional view of the first channel being a tapered and tapered type;

16 is a schematic cross-sectional view of the first channel being a gradually expanding and tapering type;

Among them, 1. the first cavity; 2. the second cavity cavity; 3. the first channel; 4. the second channel; 5. the spray cylinder; 6. the third cavity.

Detailed ways

Example 1

An external swirl cross-hole injector, comprising: a body, the body has a first cavity 1 and a third cavity 6 arranged up and down, and a second cavity arranged on the periphery of the first cavity 1 and the third cavity 6 cavity 2;

The first cavity 1 and the third cavity 6 are communicated through the first channel 3; a spray cylinder 5 is arranged between the second cavity 2 and the third cavity 6, and the spray cylinder 5 is provided with a plurality of communicating second The cavity 2 and the second channel 4 of the third cavity 6 .

In this embodiment, the first cavity 1 , the second cavity 2 and the third cavity 6 are arranged coaxially.

The third cavity 6 is a mixing cavity.

The first channel 3 is at least one shunt and confluence channel, wherein the shunt part is arranged on the side close to the first cavity 1 .

In this embodiment, the first channel 3 adopts a cross-spray hole structure to enhance the turbulent flow of the mixed fluid, which is beneficial to spray atomization.

Wherein, the longitudinal cross-sectional shape of the first channel 3 is one of a tapered type, a gradually expanded type, a tapered and gradually expanded type, or a gradually expanded and tapered type.

In other embodiments, the first channel 3 is a single-hole channel, and the single-hole channel is a straight cylindrical circular hole.

In this embodiment, the centerline of the second channel 4 and the radial section of the spray cylinder 5 are inclined, and the angle of the inclination is 0°≤A<arcsin(R1/R2), where R1 is the diameter of the spray cylinder 5 The inner diameter, R2 is the outer diameter of the injection cylinder 5 .

Wherein, the inclined included angles between the centerlines of the plurality of second passages 4 and the radial section of the spray cylinder 5 may be set to be the same.

In other embodiments, the inclination angles between the centerlines of the plurality of second passages 4 and the radial section of the spray cylinder 5 may be different.

In this embodiment, the included angle β between the centerline of the second channel 4 and the axis of the injection cylinder 5 is β, wherein the centerline of the plurality of second channels 4 and the included angle β of the axis of the injection cylinder 5 may all be right angles;

The angle β between the centerlines of the plurality of second channels 4 and the axis of the injection cylinder 5 may also be non-right angles, or the angle β between the centerlines of the second channels 4 and the axis of the injection cylinder 5 is a right angle, and the remaining part is a non-right angle. Right angle.

The included angles β between the centerlines of the plurality of second passages 4 and the axis of the spray cylinder 5 may be set the same or different.

In this embodiment, the longitudinal cross-sectional shape of the second channel 4 is one of a straight cylinder type, a tapered type, a gradually expanded type, a tapered and expanded type, or a gradually expanded and tapered type.

The longitudinal cross-sectional shape of the spray cylinder 5 adopts a cylindrical shape or an outward-expanded "eight" shape.

The inclined angle between the centerlines of the plurality of second passages 4 and the radial section of the spray cylinder 5 and the angle β between the centerlines of the plurality of second passages 4 and the axis of the spray cylinder 5 can be set in any combination.

The working principle of this embodiment: the first fluid is sprayed from the first cavity 1 through the first channel 3 into the third cavity 6, and the second fluid passes from the second cavity 2 through the second channel 4 to increase the swirl rate, and the high speed Shooting to the third cavity 6 to mix with the first fluid to enhance the jetting effect of the first fluid.

Example 2

In this example, an external swirl cross-hole injector is used, and gas and liquid are mixed. In order to reduce the NOx emission in the engine after-treatment system, a reducing agent is injected into the exhaust gas, and a gas-assisted nozzle is used. NH3 and NOx in urea After mixing, the reaction is carried out in the SCR system to reduce emissions and effectively alleviate the crystallization problem of urea solution.

In this embodiment, the first cavity is used for inputting liquid, and the second cavity is used for inputting gas.

Example 3

In this example, an external swirl cross-hole injector is used, and two gases are mixed. The mixed gas of trichlorosilane and hydrogen in the field of polysilicon production enters the furnace cavity of the reduction furnace through the mixed gas nozzle, and is completed under high temperature and high pressure. The resulting silicon is deposited on the silicon mandrel.

In this embodiment, the first cavity is used for inputting trichlorosilane, and the second cavity is used for inputting hydrogen.

The above are only preferred embodiments of the present invention, and do not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are still within the scope of the present invention. within the scope of the technical solution of the present invention.

Claims (9)

1. An external swirl cross hole injector, comprising: the body is provided with a first cavity, a third cavity and a second cavity, wherein the first cavity and the third cavity are arranged up and down, and the second cavity is arranged on the periphery of the first cavity and the third cavity;

the first cavity and the third cavity are communicated through a first channel; an injection cylinder is arranged between the second cavity and the third cavity, and a plurality of second channels communicated with the second cavity and the third cavity are arranged on the injection cylinder.

2. The external swirl cross bore injector of claim 1 wherein the first passage is at least 1 split converging passage with a split portion disposed on a side adjacent the first cavity.

3. The external swirl cross-hole injector of claim 2 wherein the longitudinal cross-sectional shape of the first passage is one of tapered, diverging, tapered diverging, or tapered diverging.

4. The external swirl cross-hole injector of claim 1 wherein the first passage is a single-hole passage that is a straight cylindrical circular hole.

5. The external swirl cross-hole injector of claim 1 wherein the centerline of the second passage is inclined at an angle of 0 ° a < arcsin (R1/R2) to the radial cross-section of the cartridge, where R1 is the inner diameter of the cartridge and R2 is the outer diameter of the cartridge.

6. The external swirl cross-hole injector of claim 5 wherein the inclined angles between the centerlines of the plurality of second passages and the radial profile of the jet cartridge are arranged the same or different.

7. The external swirl cross-hole injector of claim 6 wherein the centerline of the second channel is at an angle β to the axis of the jet cylinder, wherein the centerline of the second channel is at a right or non-right angle to the axis of the jet cylinder, and wherein the centerlines of the second channels are at the same or different angles β to the axis of the jet cylinder.

8. The external swirl cross-hole injector of claim 7 wherein the longitudinal cross-sectional shape of the second passage is one of a straight barrel, tapered, diverging, tapered diverging, or tapered diverging.

9. The external swirl cross-hole injector of claim 5 wherein the longitudinal cross-sectional shape of the cartridge is in the form of an outwardly flared "splay".

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