CN213669939U - Gas-liquid mixing ejector - Google Patents

Abstract

The utility model relates to a gas-liquid mixing ejector, which comprises a mixing chamber, a choke and a diffusion chamber which are sequentially communicated along the fluid flowing direction, wherein the mixing chamber is provided with a working main stream inlet connected with a clear water source and a working secondary stream inlet connected with an air source; a nozzle for spraying clear water is arranged in the mixing chamber; the working main flow inlet is communicated with the mixing chamber through a nozzle; the cross-sectional area of the throat is smaller than the cross-sectional areas of the mixing chamber and the diffusion chamber. The ejector effectively improves the oxygen utilization rate of aeration oxygenation, obviously improves aeration efficiency, effectively ensures sewage biochemical treatment effect, and has the advantages of high aeration efficiency, good oxygenation effect, long service life, convenient installation and maintenance and the like.

Description

Gas-liquid mixing ejector

Technical Field

The utility model belongs to the technical field of sewage treatment, concretely relates to gas-liquid mixture sprayer.

Background

The sewage treatment process usually adopts an oxygenation aeration mode to operate an aerobic tank, and the principle of the aerobic tank is that oxygen is forcedly and rapidly transferred into a water body, so that the oxygen, activated sludge and pollutants in the air are fully mixed, the activated sludge is in a suspension state, the oxygen is transferred from a gas phase to a liquid phase and from the liquid phase to the activated sludge, and the microorganisms are ensured to have enough oxygen to carry out substance metabolism.

The aeration device commonly used at present in China mainly comprises two types, one type is a blast aeration disc, the oxygen utilization rate is about 20%, and the aeration efficiency is low, so that the aeration device not only influences the biochemical treatment effect of sewage, but also directly influences the occupied area, investment and operating cost of a treatment plant. Another type is a gas-liquid mixing ejector, for example, patent No. 201520500356.1 discloses a gas-liquid mixing ejector for a sewage treatment aeration system, which is used in combination with a low-speed water pump, and can mix air into sewage and activated sludge and inject the mixture into an aeration tank while the sewage and activated sludge are fed into the aeration tank.

SUMMERY OF THE UTILITY MODEL

The utility model provides a gas-liquid mixing ejector aiming at the technical problems in the prior art, which improves the problems of low aeration efficiency and influence on the biochemical treatment effect of sewage existing in the prior oxygenation aeration device; the gas-liquid mixing effect is poor, the service life of the inner nozzle and the outer nozzle is short, the inner nozzle and the outer nozzle are easy to block, and the working efficiency is influenced.

The utility model provides an above-mentioned technical problem's technical scheme as follows:

a gas-liquid mixing ejector comprises a mixing chamber, a throat pipe and a diffusion chamber which are sequentially communicated along the flowing direction of fluid, wherein a working main flow inlet connected with a clear water source and a working secondary flow inlet connected with an air source are arranged on the mixing chamber; a nozzle for spraying clear water is arranged in the mixing chamber; the working main flow inlet is communicated with the mixing chamber through a nozzle; the cross-sectional area of the throat is smaller than the cross-sectional areas of the mixing chamber and the diffusion chamber.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Furthermore, the central axes of the nozzle, the throat pipe and the diffusion chamber are positioned on the same straight line.

Further, the nozzle is a conical nozzle.

Further, the nozzle is made of polytetrafluoroethylene materials.

Further, the ejector adopts a stainless steel or carbon steel lining and a polytetrafluoroethylene shell.

Furthermore, the drift diameter of the working main flow inlet is 1/3-1/2 of the drift diameter of the mixing chamber.

Further, the working secondary flow inlet is connected with a gas supercharging device.

Further, the cross section of the mixing chamber and the throat pipe is circular or rectangular.

Further, the number of the working secondary flow inlets is two, and the working secondary flow inlets are symmetrically distributed on the side wall of the mixing chamber.

Further, a static mixer is fixedly arranged in the mixing chamber.

The utility model has the advantages that: the ejector effectively improves the oxygen utilization rate of aeration oxygenation, obviously improves the aeration efficiency, effectively ensures the sewage biochemical treatment effect, and has the advantages of high aeration efficiency, good oxygenation effect, long service life, convenience in installation and maintenance and the like.

Drawings

Fig. 1 is a schematic structural diagram of the ejector of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. working main stream inlet, 2, nozzle, 3, mixing chamber, 4, throat, 5, diffusion chamber, 6, working secondary stream inlet.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

It should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are intended to be construed broadly, as if they were connected either fixedly or removably, or as integrally formed structures. To those of ordinary skill in the art, the specific meaning of such terms in this patent may be understood as appropriate.

As shown in fig. 1, the gas-liquid mixing ejector of the present embodiment includes a mixing chamber 3, a throat 4 and a diffusion chamber 5 sequentially communicated along a fluid flow direction, wherein the mixing chamber 3 is provided with a working main stream inlet 1 connected to a clean water source and a working secondary stream inlet 6 connected to an air source; a nozzle 2 for spraying clear water is arranged in the mixing chamber 3; the working main flow inlet 1 is communicated with the mixing chamber 3 through a nozzle 2; the cross-sectional area of the throat 4 is smaller than the cross-sectional areas of the mixing chamber 3 and the diffusion chamber 5.

Preferably, the central axes of the nozzle 2, the throat 4 and the diffusion chamber 5 are positioned on the same straight line, so that the loss of the kinetic energy of the fluid is reduced, and the requirement of long-distance transportation is met.

Preferably, the nozzle 2 is a conical nozzle, the conical nozzle is provided with a conical inlet for guiding flow and a straight section for bundling, the clean water fluid can easily enter the nozzle, and the distribution of the clean water on the cross section of the nozzle is more uniform compared with that of a cylindrical nozzle.

The nozzle 2 can be made of polytetrafluoroethylene materials, and can also be made of other wear-resistant and corrosion-resistant materials, so that the nozzle 2 is prevented from being worn, and the service life of the nozzle 2 is prolonged.

Preferably, the ejector adopts a stainless steel or carbon steel lining and a polytetrafluoroethylene shell so as to improve the service performance of the ejector and prolong the service life of the ejector.

Preferably, the drift diameter of the working main flow inlet 1 is 1/3-1/2 of the drift diameter of the mixing chamber 3, so that the gas-liquid mixing effect of the ejector and the utilization rate of oxygen are improved. Because the length of the mixing chamber 3 of the ejector is not too long, the residence time of the air mixed with the clear water fluid is comprehensively considered, the drift diameter of the mixing chamber 3 is set to be 2-3 times of the drift diameter of the working main flow inlet 1, the gas-liquid mixing effect and the oxygen utilization rate of the ejector can be ensured, and the ejector is economical.

Further, the working secondary flow inlet 6 is connected with a gas supercharging device, so that gas is pressurized, certain boosting effect on gas-liquid mixing is achieved, meanwhile, the conveying pressure can be greatly improved, and the requirement of long-distance conveying is met.

The cross section of the mixing chamber 3 and the throat 4 is preferably circular or rectangular, so that the ejector is convenient to install and maintain, and the production difficulty and cost are reduced.

The number of the working secondary flow inlets 6 can be one, so that the cost is reduced; two mixing chambers can be arranged and are symmetrically distributed on the side wall of the mixing chamber 3, so that the mixing effect of the air and the clean water in the mixing chamber 3 is further improved, and the aeration efficiency is improved.

Further, a static mixer, preferably an SV type static mixer, an SX type static mixer, or an SH type static mixer is fixedly installed in the mixing chamber 3 to improve the mixing effect of the air and the clear water fluid, so that the air and the clear water fluid are sufficiently mixed, and further, the utilization rate of the oxygen is remarkably improved.

The operating principle of the ejector is as follows:

clear water fluid enters through a working main flow inlet 1 and is sprayed out of a mixing chamber 3 at a high speed through a nozzle 2, the pressure energy of the clear water is converted into kinetic energy, the flow speed is increased rapidly, the kinetic energy of the fluid is increased, and high-speed jet flow is formed; air enters the mixing chamber 3 through the working secondary flow inlet 6;

in the mixing chamber 3, the air is forcibly carried by the high-speed jet flow, and then the air and the clean water of the high-speed jet flow are mutually rubbed, mixed and extruded to form gas-liquid mixed flow, so that the oxygen in the air is fully mixed, and the utilization rate of the oxygen and the aeration efficiency are obviously improved;

the gas-liquid mixed flow enters the diffusion chamber 5 after flowing through the throat pipe 4, so that the pressure in the mixing chamber 3 is reduced, a vacuum or negative pressure area is formed, the gas is sucked and mixed more favorably, and the gas-liquid mixing effect is improved;

the gas-liquid mixed flow is ejected from the outlet end of the diffusion chamber 5 into the aeration tank.

The ejector effectively improves the oxygen utilization rate of aeration oxygenation, obviously improves the aeration efficiency, effectively ensures the sewage biochemical treatment effect, and has the advantages of high aeration efficiency, good oxygenation effect, long service life, convenience in installation and maintenance and the like.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (8)

1. A gas-liquid mixing ejector comprises a mixing chamber (3), a throat (4) and a diffusion chamber (5) which are sequentially communicated along the flow direction of fluid, and is characterized in that a working main flow inlet (1) connected with a clean water source and a working secondary flow inlet (6) connected with an air source are arranged on the mixing chamber (3); a nozzle (2) for spraying clean water is arranged in the mixing chamber (3); the working main flow inlet (1) is communicated with the mixing chamber (3) through a nozzle (2); the cross section area of the throat pipe (4) is smaller than that of the mixing chamber (3) and the diffusion chamber (5);

the working secondary flow inlets (6) are connected with gas supercharging equipment, and the number of the working secondary flow inlets (6) is two and the working secondary flow inlets are symmetrically distributed on the side wall of the mixing chamber (3).

2. The ejector according to claim 1, characterized in that the central axes of the nozzle (2), throat (4), diffusion chamber (5) are located on the same line.

3. The ejector according to claim 1, characterized in that the nozzle (2) is a conical nozzle.

4. The injector according to claim 1, characterized in that the nozzle (2) is made of polytetrafluoroethylene material.

5. The injector of claim 1, wherein the injector is a stainless steel or carbon steel liner, a teflon housing.

6. The ejector according to claim 1, characterized in that the working main flow inlet (1) has a passage from 1/3 to 1/2 of the passage of the mixing chamber (3).

7. The ejector according to claim 1, characterized in that the mixing chamber (3), the throat (4) are circular or rectangular in cross-section.

8. The injector as claimed in claim 1, characterized in that a static mixer is fixedly mounted in the mixing chamber (3).

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