CN109534442B

CN109534442B - Angle type multi-stage cavitation generator

Info

Publication number: CN109534442B
Application number: CN201811480393.5A
Authority: CN
Inventors: 王秀礼; 安策; 赵媛媛; 朱荣生; 陈一鸣; 陈靖
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2018-12-05
Filing date: 2018-12-05
Publication date: 2021-08-03
Anticipated expiration: 2038-12-05
Also published as: CN109534442A

Abstract

The invention provides an angle type multistage cavitation generator which comprises a shell, a first-stage cavitation sleeve, a second-stage cavitation sleeve, a third-stage cavitation sleeve, a sealing ring and a bottom cover. The first-stage cavitation sleeve, the second-stage cavitation sleeve and the third-stage cavitation sleeve are sequentially arranged in the shell from outside to inside. A plurality of first-stage cavitation generating holes are uniformly distributed on the wall surface of the first-stage cavitation sleeve, a plurality of second-stage cavitation generating holes are uniformly distributed on the wall surface of the second-stage cavitation sleeve, a plurality of third-stage cavitation generating holes are uniformly distributed on the wall surface of the third-stage cavitation sleeve, and the inlet and the outlet of the shell are communicated through the cavitation generating holes at all stages. The cavitation generation hole comprises a front section, a diffusion section and a stand column, wherein the diffusion section is a conical hole; the cone angle direction of the conical hole is gradually expanded along the liquid flowing direction; the taper angle of the taper hole is 45-75 degrees. The invention has simple and compact structure, the structure of the multistage cavitation sleeve can efficiently treat and degrade organic pollutants in sewage, and the multistage cavitation sleeve has wide development space and application prospect.

Description

Angle type multi-stage cavitation generator

Technical Field

The invention relates to the field of sewage treatment, in particular to an angle type multistage cavitation generator.

Background

With the continuous development of modern industries such as pharmacy, chemical industry, printing and dyeing and the like, the number of artificially synthesized macromolecular organic matters and difficultly-degraded chemical substances in water bodies increases year by year, so that the traditional sewage treatment method is difficult to adapt to the increasingly strict environmental protection requirements at present, and the advantage of degrading organic pollutants by hydrodynamic cavitation is reflected. Hydrodynamic cavitation is a hydrodynamic phenomenon. Extreme conditions such as local high temperature and high pressure, luminescence, discharge, strong shock wave, high-speed jet flow and the like provided when cavitation bubbles generated in the hydrodynamic cavitation process move and collapse in liquid can strengthen physical and chemical processes, for example, water molecules can generate chemical bond fracture and generate free radicals in the cavitation bubbles, and the purpose of degrading organic pollutants is further achieved.

The existing cavitation generator adopts a single-stage structure, so that incomplete cavitation reaction is easy to occur, organic pollutants are still remained in the treated sewage, and the final aim of sewage treatment can be achieved only by further hydrodynamic cavitation degradation.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the angle type multistage cavitation generator which is simple and compact in structure and has a structure of a multistage cavitation sleeve, can efficiently treat and degrade organic pollutants in sewage, and has wide development space and application prospect.

The present invention achieves the above-described object by the following technical means.

The utility model provides a multistage cavitation generator of angle type, includes the cavitation sleeve, the cavitation sleeve is located inside the shell, a plurality of cavitation generating holes of equipartition on the wall of cavitation sleeve, through cavitation generating hole makes shell import and export intercommunication.

Further, the cavitation generation hole comprises a front section and a diffusion section, and the diffusion section is a tapered hole; the small diameter end of the diffusion section is connected with the front section, and the cone angle direction of the conical hole is gradually expanded along the liquid flowing direction.

Furthermore, a plurality of upright posts are uniformly distributed in the diffusion section along the circumferential direction of the axis of the conical hole.

Furthermore, a hole sleeve is embedded in the cavitation generation hole, and a plurality of stand columns are uniformly distributed in the hole sleeve along the circumferential direction of the axis of the conical hole.

Further, the cross section of the upright post is circular, triangular, quadrilateral or polygonal; the number of the stand columns is 3-5.

Further, the diameter of the front section is 0.0001-0.01 time of the inner diameter of the inlet of the shell; the cone angle of the conical hole of the diffusion section is 45-75 degrees.

Furthermore, the cavitation sleeve is a multi-stage cavitation sleeve, and the cavitation sleeve of the next stage is coaxially arranged in the cavitation sleeve of the previous stage.

Further, the diameter of the front section of the cavitation generation hole in the next stage of the cavitation sleeve is 0.5-0.8 time that of the front section of the cavitation generation hole in the previous stage of the cavitation sleeve.

Further, the radial distance of the cavity between the adjacent stages of cavitation sleeves is 1.5-2.5 times of the wall thickness of the cavitation sleeve.

Further, the axial distance between every two adjacent rows of cavitation generating holes of the cavitation sleeve of any stage is 0.2-1.3 times of the maximum diameter of the diffusion section.

The invention has the beneficial effects that:

1. the angle-type multistage cavitation generator can efficiently treat and degrade organic pollutants in sewage through the multistage multiple cavitation generating holes and the cavitation generating holes comprising the front section, the diffusion section and the upright post.

2. According to the angle type multistage cavitation generator, under the action of high pressure, sewage flows into the downstream through the cavitation generating holes and is subjected to the action of the multistage cavitation sleeve, so that organic pollutants are more effectively degraded, and the cavitation efficiency is high.

Drawings

Fig. 1 is a structural view of an angular multi-stage cavitation generator according to the present invention.

Fig. 2 is a cross-sectional view of a cavitation sleeve in accordance with the present invention.

Fig. 3 is an enlarged view of cavitation generating holes according to the present invention.

In the figure:

1-a housing; 2-first stage cavitation sleeve; 3-a secondary cavitation sleeve; 4-three-stage cavitation sleeve; 5-sealing ring; 6-bottom cover; 21-first order cavitation generating hole; 31-secondary cavitation generating holes; 41-three-level cavitation generating holes; 21 a-a column; 21 b-a diffuser section; 21 c-preceding paragraph.

Detailed Description

The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.

As shown in fig. 1 and 2, the angular multistage cavitation generator of the present invention includes a housing 1, a primary cavitation sleeve 2, a secondary cavitation sleeve 3, a tertiary cavitation sleeve 4, a sealing ring 5, and a bottom cover 6. The first-stage cavitation sleeve 2, the second-stage cavitation sleeve 3 and the third-stage cavitation sleeve 4 are sequentially arranged inside the shell 1 from outside to inside. The cavity of the shell is of a drum-shaped structure, and the primary cavitation sleeve 2, the secondary cavitation sleeve 3 and the tertiary cavitation sleeve 4 which are arranged inside the shell are of cylindrical structures. A plurality of first-stage cavitation generating holes 21 are uniformly distributed on the wall surface of the first-stage cavitation sleeve 2, a plurality of second-stage cavitation generating holes 31 are uniformly distributed on the wall surface of the second-stage cavitation sleeve 3, a plurality of third-stage cavitation generating holes 41 are uniformly distributed on the wall surface of the third-stage cavitation sleeve 4, the inlet and the outlet of the shell 1 are communicated through the cavitation generating holes at all stages, the cavitation sleeves at all stages are fixed inside the shell 1 through the bottom cover 6, and the cavitation sleeves at all stages are sealed through the sealing ring 5 arranged between the shell 1 and the bottom cover 6.

As shown in fig. 2 and fig. 3, taking the primary cavitation generating hole 21 as an example, the primary cavitation generating hole 21 includes a front section 21c, a diffuser section 21b and a pillar 21a, one end of the front section 21c is communicated with the cavity between the primary cavitation sleeve 2 and the housing 1, and the other end of the front section 21c forms a communication channel with the diffuser section 21 b. The diffuser section 21b is a tapered hole. The cone angle direction of the conical hole is gradually expanded along the liquid flowing direction. The upright posts 21a are positioned in the middle of the diffuser section 21b and are uniformly distributed along the circumferential direction of the central axis of the primary cavitation generating hole 21, and the cross section of the upright posts 21a can be circular, triangular, quadrangular or polygonal. The number of the upright columns 21a in each primary cavitation generating hole 21 is 3-5. The cone angle of the conical hole of the diffusion section 21b is 45-75 degrees. Manufacturing difficulties can exist due to the fact that the posts 21a are disposed directly within the diffuser section 21 b. For convenience of processing and manufacturing, as shown in fig. 3, a hole sleeve having the same shape as the primary cavitation generating hole 21 is inserted into the primary cavitation generating hole 21, and an upright post 21a can be welded inside the hole sleeve. The mode of embedding the hole sleeve can be threaded connection or shrink fit interference. The material of the hole sleeve is hard alloy.

The inner and outer surfaces of the first-stage cavitation sleeve 2, the second-stage cavitation sleeve 3 and the third-stage cavitation sleeve 4 are hardened. The hardening treatment comprises butt welding of cemented carbide or nitriding, increasing the impact resistance of the cavitation sleeve.

The diameter of the front section 21c of the primary cavitation hole 21 is 0.0001-0.01 times of the inner diameter of the inlet of the shell 1, so that on one hand, the phenomenon that the flow velocity in the cavitation hole is too low due to too large diameter and the cavitation effect cannot be generated is prevented; on the other hand, preventing an excessively small diameter from causing a blocked flow to occur, results in a decrease in degradation efficiency.

The first-stage cavitation generating hole 21, the second-stage cavitation generating hole 31 and the third-stage cavitation generating hole 41 have similar structures, the only difference is that the diameters of the front sections of the first-stage cavitation generating hole 21, the second-stage cavitation generating hole 31 and the third-stage cavitation generating hole 41 are different, and the diameter is reduced to be 0.5-0.8 times of that of the previous stage when the first-stage cavitation generating hole is increased from outside to inside. That is, the front section 21c of the secondary cavitation generating hole 31 is 0.5 to 0.8 times the front section 21c of the primary cavitation generating hole 21. This is because the pressure is decreased due to the hydraulic loss when the cavitation treatment is performed at the first stage, and the diameter of the front stage is reduced while the number of cavitation generating holes is reduced in order to secure the flow rate to achieve the cavitation generating condition of the secondary cavitation generating holes. The radial distance of the cavity between the adjacent stages of cavitation sleeves is 1.5-2.5 times of the wall thickness of the cavitation sleeve, and the wall thicknesses of the first stage cavitation sleeve 2, the second stage cavitation sleeve 3 and the third stage cavitation sleeve 4 are the same. Namely, the radial distance of the cavity between the first-stage cavitation sleeve 2 and the second-stage cavitation sleeve 3 is 1.5-2.5 times of the wall thickness of the first-stage cavitation sleeve 2.

The minimum number of each row of the first-stage cavitation generating holes 21 uniformly distributed along the circumferential direction is 4, the minimum number of each row of the second-stage cavitation generating holes 31 uniformly distributed along the circumferential direction is 6, the minimum number of each row of the third-stage cavitation generating holes 41 uniformly distributed along the circumferential direction is 8, and the axial distance between every two adjacent rows of the cavitation generating holes at all levels is 0.2-1.3 times of the maximum diameter of the diffuser section 21 b.

The working principle is as follows:

high-pressure sewage is introduced into the angle-type multistage cavitation generator through the inlet of the shell 1, under the action of high pressure, the sewage flows into the downstream through the primary cavitation generating holes 21 distributed on the primary cavitation generating sleeve 2, and meanwhile, the cross-sectional area of the front section 21c of each cavitation generating hole 21 is very small, so that the flow velocity of the sewage at the position is very high. Then, due to the change of the flow cross section in the cavitation generating hole 21 and the choke flow effect of the upright post 21a, cavitation is caused at the diffuser section 21b of the primary cavitation generating hole 21. In the same way, the sewage sequentially passes through the secondary cavitation sleeve and the tertiary cavitation sleeve, and finally, the sewage subjected to the hydrodynamic cavitation treatment flows out of the cavitation generator through the outlet flow channel of the shell 1.

The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.

Claims

1. An angle type multistage cavitation generator is characterized by comprising cavitation sleeves (2, 3 and 4), wherein the cavitation sleeves (2, 3 and 4) are positioned inside a shell (1), a plurality of cavitation generating holes (21, 31 and 41) are uniformly distributed on the wall surfaces of the cavitation sleeves (2, 3 and 4), and the inlet and the outlet of the shell (1) are communicated through the cavitation generating holes (21, 31 and 41); the cavitation sleeves (2, 3 and 4) are multi-stage cavitation sleeves, and the cavitation sleeve (2, 3 and 4) of the next stage is coaxially arranged in the cavitation sleeve (2, 3 and 4) of the previous stage; the cavitation generation hole (21, 31, 41) comprises a front section (21 c) and a diffusion section (21 b), and the diffusion section (21 b) is a conical hole; the small-diameter end of the diffusion section (21 b) is connected with the front section (21 c), and the cone angle direction of the conical hole is gradually expanded along the liquid flowing direction; a plurality of upright posts (21 a) are uniformly distributed in the diffusion section (21 b) along the circumferential direction of the axis of the conical hole.

2. Angular multistage cavitation generator according to claim 1, characterized in that the cross section of the uprights (21 a) is circular or triangular or quadrangular or polygonal; the number of the upright posts (21 a) is 3-5.

3. The angular multistage cavitation generator according to claim 1, characterized in that the diameter of the front section (21 c) is 0.0001 to 0.01 times the inner diameter of the inlet of the housing (1); the cone angle of the conical hole of the diffusion section (21 b) is 45-75 degrees.

4. The angular multi-stage cavitation generator according to claim 1, wherein the diameter of the front section (21 c) of the cavitation hole (21, 31, 41) of the cavitation sleeve (2, 3, 4) of the next stage is 0.5 to 0.8 times the diameter of the front section (21 c) of the cavitation hole (21, 31, 41) of the cavitation sleeve (2, 3, 4) of the previous stage.

5. The angular multi-stage cavitation generator according to claim 1, characterized in that the radial distance of the cavity between adjacent stages of the cavitation sleeves (2, 3, 4) is 1.5-2.5 times the wall thickness of the cavitation sleeves (2, 3, 4).

6. The angular multi-stage cavitation generator according to claim 1, characterized in that the axial distance between adjacent rows of cavitation-generating holes (21, 31, 41) of the cavitation sleeve (2, 3, 4) of any stage is 0.2 to 1.3 times the maximum diameter of the diffuser section (21 b).