CN-119706988-B - Aeration enhanced cavitation jet device and working method

CN119706988BCN 119706988 BCN119706988 BCN 119706988BCN-119706988-B

Abstract

The invention discloses an aeration enhanced cavitation jet device and a working method in the cavitation field, wherein air enters from an air inlet and then enters into a space between an upper cylindrical orifice plate and a lower cylindrical orifice plate from an air injection hole, high-pressure water is flushed into the space between the upper cylindrical orifice plate and the lower cylindrical orifice plate from a high-pressure water inlet and is initially mixed with air, an air injection pipe sends the air into a lower aeration tank, a first-stage cavitation enhancement effect is achieved between the high-pressure water and the air in the upper cylindrical orifice plate and the lower cylindrical orifice plate, a second-stage cavitation enhancement effect is achieved through a large cavitation nozzle and a small cavitation nozzle through the initially mixed high-pressure water, a screw rotates to enable the water and the air to be more fully mixed to achieve a third-stage cavitation enhancement effect, a high-speed jet flows through a support arm to an outlet at the bottom of an aeration device to achieve a fourth-stage cavitation enhancement effect, and multistage enhancement is adopted at a plurality of positions, so that the intensity of cavitation is changed within a certain range, and the cavitation efficiency and the controllability are improved.

Inventors

HE PEIYU
TIAN YE
WANG PAN
XIA YUBING
Sang Runchi
ZHANG YAN
QIAN LIMING
LIU WEILI
WANG YUN

Assignees

江苏大学

Dates

Publication Date: 20260512
Application Date: 20241125

Claims (10)

1. The utility model provides an aeration enhancement mode cavitation jet device, water in the water tank gets into aeration equipment (4) after high-pressure water pump, in air current flows through air compressor machine back entering aeration equipment (4), the import of submerged cavitation nozzle (11) is opened to the exit linkage that aeration equipment (4) bottom was opened, and submerged cavitation nozzle (11) are beyond the surface of water tank, its characterized in that: The aeration device (4) comprises a sealed cavity formed by up-down involution and sealing connection of an upper aeration tank (18) and a lower aeration tank (23), an upper cylindrical pore plate (17), an air injection pipe (13), a lower cylindrical pore plate (20), a large cavitation nozzle (16) and a small cavitation nozzle (14) are arranged in the sealed cavity, an air inlet (21) is formed in the top of the upper aeration tank (18), an upper cylindrical pore plate (17) is arranged right below the air inlet (21), the outer wall of the upper cylindrical pore plate (17) is fixedly connected with the inner wall of the upper aeration tank (18), a lower cylindrical pore plate (20) is arranged right below the upper cylindrical pore plate (17), a high-pressure water inlet (22) is formed in the side wall of the upper aeration tank (18) between the upper cylindrical pore plate (17) and the lower cylindrical pore plate (20), a plurality of circular array air injection holes (19) and air injection pipes (13) are arranged on the upper cylindrical pore plate (17), the air injection pipes (13) penetrate through the lower cylindrical pore plate (20) downwards and extend into the air outlet (39) of the lower aeration tank (23) at the bottom of the lower aeration tank (13), the upper part in the lower aeration tank (23) is provided with a screw propeller which is connected to a vertical main shaft (31) through a bearing, the main shaft (31) is positioned on the central axes of the upper aeration tank (18) and the lower aeration tank (23), the bottom end of the main shaft (31) is fixedly connected with the inner wall of the lower aeration tank (23) through a support (29), the support (29) is composed of three double-wing-shaped support arms (42), and the lower aeration tank (23) is in a cone shape with big top and small bottom.
2. An aeration enhanced cavitation jet device according to claim 1, wherein the propeller comprises an upper propeller (25) and a lower propeller (26) which are respectively connected to the main shaft (31) through corresponding upper bearings (27) and lower bearings (28), each propeller comprises three propeller blades, every two adjacent propeller blades are 120 degrees, and every six propeller blades are arranged in a staggered manner by 60 degrees.
3. The aeration enhanced cavitation jet device according to claim 1, wherein a backflow prevention device is arranged in the gas injection pipe (13) close to the upper part of the gas outlet hole (39), the backflow prevention device consists of a small steel ball (36), a spring (38) and a baffle plate (37), the small steel ball (36) can move up and down in the gas injection pipe (13), the baffle plate (37) is a through conical plate with a smaller upper hole and a larger lower hole, the lower end of the baffle plate (37) is fixedly connected with the inner wall of the gas injection pipe (13), the diameter of the upper hole is smaller than that of the small steel ball (36), the spring (38) is arranged at the bottom of the gas injection pipe (13), the top end of the spring (38) is fixedly connected with the small steel ball (36), and when the spring (38) is compressed under the gas flow, the bottom end of the small steel ball (36) is always positioned above the center of the gas outlet hole (39).
4. An aeration enhanced cavitation jet device according to claim 1, wherein the cross section of the gas injection pipe (13) is stepwise reduced from top to bottom.
5. An aeration enhanced cavitation jet device according to claim 1, wherein the bottom end of the gas injection hole (19) is provided with a backflow preventing device.
6. The aeration enhanced cavitation jet device according to claim 1, wherein the large cavitation nozzles (16) and the small cavitation nozzles (14) are staggered along the inner and outer directions, the heights of the large cavitation nozzles and the small cavitation nozzles are the same, and the inlets are sequentially connected with the contraction pipe, the throat pipe and the diffusion pipe.
7. An aeration enhanced cavitation jet device according to claim 6, wherein the inlet inner diameter of the large cavitation nozzle (16) is 2-3 times the inlet inner diameter of the small cavitation nozzle (14), the maximum inner diameter of the shrinkage tube of the large cavitation nozzle (16) is 2-3 times the maximum inner diameter of the shrinkage tube of the small cavitation nozzle (14), the throat inner diameter of the large cavitation nozzle (16) is 1.5 times the throat inner diameter of the small cavitation nozzle (14), and the throat length of the small cavitation nozzle (14) is longer than the throat length of the large cavitation nozzle (16).
8. An aeration enhanced cavitation jet device according to claim 1, wherein the lower cylindrical orifice plate (20) is at the boundary of the upper aeration tank (18) and the lower aeration tank (23).
9. An aeration enhanced cavitation jet device according to claim 1, wherein a space is provided between the upper cylindrical orifice plate (17) and the air inlet (21) to store air.
10. A method of operating an aeration enhanced cavitation jet device according to any one of claims 1 to 8, comprising the steps of: Step A), air enters a space between an upper cylindrical orifice plate (17) and a lower cylindrical orifice plate (20) from an air inlet (21) and then enters the space between the upper cylindrical orifice plate (17) and the lower cylindrical orifice plate (20) from an air injection hole (19), meanwhile, high-pressure water is flushed into the space between the upper cylindrical orifice plate (17) and the lower cylindrical orifice plate (20) from a high-pressure water inlet (22) and is primarily mixed with the air, the air is fed into a lower aeration tank (23) by an air injection pipe (13), and the high-pressure water and the air complete the first-stage cavitation enhancement effect between the upper cylindrical orifice plate (17) and the lower cylindrical orifice plate (20); The step B) is that the preliminarily mixed high-pressure water forms high-speed jet flow and cavitation bubbles through a large cavitation nozzle (16) and a small cavitation nozzle (14), and the second-stage cavitation enhancement effect is completed, so that the high-pressure water is uniformly distributed in a lower aeration tank (23); Step C), air passing through the air injection pipe (13) passes through the upper cylindrical orifice plate (17) and the lower cylindrical orifice plate (20) to be further mixed with high-pressure water, and the propeller rotates under the high-speed jet effect formed by the large cavitation nozzle (16) and the small cavitation nozzle (14), so that the water and the air are more fully mixed, and the third-stage cavitation enhancement effect is completed; and D), enabling the high-speed jet flow to pass through the support arm (42), accelerating the flow speed, reducing the pressure, generating negative pressure, and flowing to an outlet at the bottom of the aeration device (4) to complete fourth-stage cavitation enhancement.

Description

Aeration enhanced cavitation jet device and working method Technical Field The invention relates to the technical field of cavitation, in particular to a method and a device for enhancing cavitation effect through an aeration and submerged cavitation nozzle. Background In some industrial fields, cavitation techniques can be well suited for high efficiency and environmental protection. When the pressure of the fluid medium is lower than the saturated vapor pressure, a large amount of bubbles are separated out, and the bubbles rapidly collapse when entering a high pressure area to generate local high-pressure high-temperature high-speed jet flow, wherein the temperature can reach 1900-5200K, the pressure can reach Gpa level, and the micro-flow speed can reach 100m/s, namely cavitation. The energy produced by cavitation can quickly decompose organic matters and can plasticize objects, so that the cavitation effect is widely applied to sewage treatment, metallurgy and the like, but the cavitation effect is not high by directly using common fluid media. At present, common methods for enhancing cavitation are that the structure of a centrifugal pump is changed, a low-pressure high-speed state is artificially set, the temperature is reduced, and the like, and the methods for enhancing cavitation have high cost, low cavitation efficiency and cannot achieve the effect of environmental protection. The patent publication No. CN109824152A, the name is a cavitation jet ozone degradation oxygenating device for marine product cultivation, which comprises a nozzle, an air suction chamber, an air suction pipe, a self-excited oscillation chamber, a throat and a diffusion pipe, wherein the air suction pipe and a liquid inlet are arranged on the outer side of the air suction chamber, the nozzle is connected to the liquid inlet of the air suction chamber, the air suction chamber is connected with the inlet of the self-excited oscillation chamber, the throat is connected with the outlet of the self-excited oscillation chamber, the inlet of the diffusion pipe is connected with the outlet of the throat, a water pump pumps working water in an aeration tank, the working water is sprayed out of the nozzle after being pressurized, ozone is sucked into the air suction chamber through the air suction pipe and enters the self-excited oscillation chamber together with the water to form pulse cavitation jet, and the self-excited oscillation chamber is utilized to change constant jet into pulse jet. The cavitation enhancement only occurs at a single position, and the enhancement degree is difficult to change to be applied to various occasions, so that the controllability is low. Disclosure of Invention The invention aims to solve the problems in the prior art and provides an aeration enhanced cavitation jet device and a working method thereof, wherein multistage enhancement is adopted, the enhancement effect is generated at a plurality of positions of the device, and the controllability is improved. The invention relates to an aeration enhanced cavitation jet device, which adopts the technical scheme that water in a water tank enters an aeration device after passing through a high-pressure water pump, air flow enters the aeration device after passing through an air compressor, an outlet arranged at the bottom of the aeration device is connected with an inlet of a submerged cavitation nozzle, the submerged cavitation nozzle is immersed in the water surface of the water tank, the aeration device comprises a sealed cavity formed by up-down involution and sealing connection of an upper aeration tank and a lower aeration tank, and an upper cylindrical pore plate, an air injection pipe, a lower cylindrical pore plate, a large cavitation nozzle and a small cavitation nozzle are arranged in the sealed cavity; an air inlet is formed in the top of the upper aeration tank, an upper cylindrical orifice plate is arranged right below the air inlet, the outer wall of the upper cylindrical orifice plate is fixedly connected with the inner wall of the upper aeration tank, a lower cylindrical orifice plate is arranged right below the upper cylindrical orifice plate, a high-pressure water inlet is formed in the side wall of the upper aeration tank between the upper cylindrical orifice plate and the lower cylindrical orifice plate, a plurality of circles of air injection holes and air injection pipes which are arrayed in a ring shape are formed in the upper cylindrical orifice plate, the air injection holes penetrate through the lower cylindrical orifice plate downwards and extend to the top of the lower aeration tank, air outlet holes in the lower aeration tank are formed in the side wall of the bottom of the air injection pipe, the bottom of the air injection pipe is closed, a plurality of circles of large cavitation nozzles and small cavitation nozzles which are distributed in a ring shape are formed in the lower cylindrical orifice plate, a propeller is ar