CN111170407B

CN111170407B - Multi-combination hydrodynamic cavitation device

Info

Publication number: CN111170407B
Application number: CN201911074002.4A
Authority: CN
Inventors: 徐伟; 王秀礼; 朱荣生; 赵媛媛; 安策; 林彬; 陈一鸣
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2019-11-06
Filing date: 2019-11-06
Publication date: 2022-03-22
Anticipated expiration: 2039-11-06
Also published as: CN111170407A

Abstract

The invention provides a multi-combination hydrodynamic cavitation device, which comprises a shell, a rotary cavitation generating device and a fixed cavitation device, wherein the shell is provided with a plurality of cavities; a rotational cavitation generating device is supported in the housing for generating at least 2 cavitation zones; the rotary cavitation generating device is connected with the power part; the fixed cavitation device is positioned at the outlet of the shell and is used for generating secondary cavitation. The shell is divided into a cavitation generating area I and a cavitation collapse area II by the rotary cavitation generating device, and the cavitation generating area I is positioned at the inlet of the shell and is used for generating at least 2 cavitation generating areas; and the cavitation collapse area II is positioned in front of the input end of the fixed cavitation device and is used for collapsing cavitation before entering the fixed cavitation device. The invention treats domestic sewage by controlling the formation of cavitation bubbles for many times, the cavitation bubbles are used as independent chemical micro-reactors, and physical and chemical changes caused by the collapse of the cavitation bubbles are utilized to rapidly treat fluid.

Description

Multi-combination hydrodynamic cavitation device

Technical Field

The invention relates to the field of cavitation devices, in particular to a multi-combination hydrodynamic cavitation device.

Background

Hydrodynamic cavitation refers to the phenomenon of bubble formation in a fluid followed by bubble collapse in a high pressure zone. In practice, this is done as such. The fluid is fed into the inlet channel of the device, and in a local area, the flow is accelerated so that the pressure drops, and under certain conditions, bubbles of compound vapour are formed. When the bubbles move out of the local zone boundaries, the pressure in the flow increases and they collapse within 10-8-10-6 seconds, the bubbles collapse, which is accompanied by a sharp jump in pressure and temperature, reaching 1000atm and 5000 ℃, forming a local jet with a velocity above 100 m/s. The main disadvantage of an excessively high pressure is that excessive heat is released, which can cause problems if the excessive temperature is detrimental to the quality and safety of the product. The collapse of the bubble is accompanied by shock waves, intense shear forces, and the release of large amounts of energy to activate atoms, molecules, and excimers and atoms located in the gas phase bubble, which initiate chemical reaction processes in the surrounding liquid or dissipate to the surroundings. In many cases, bubble collapse is light emitting. Generally, it is accompanied by the emission of ultraviolet and visible light, which may cause photochemical reactions.

The prior art discloses a device for hydraulically degrading organic matters in wastewater, which comprises a Venturi tube assembly and a sieve plate assembly which are mutually connected in series, wherein the water inlet end of the Venturi tube assembly is connected with a high-pressure pump wastewater device, and the water outlet end of the sieve plate assembly is connected with a water outlet pipeline.

The prior art discloses a vortex cavitation device, which comprises a water inlet pipe, a vortex bin, a cavitation block and a baffle plate. The device passes through the inlet tube by the organic sewage of certain pressure and velocity of flow, because certain low pressure, the organic sewage gets into double helix slot and takes place the cavitation in cavitation storehouse promptly, and the organic sewage that takes place the cavitation further accelerates the speed of rivers through the cavitation piece takes place the cavitation, discharges through the toper aperture in bottom and has the baffle of cavitation bubble organic sewage impact below and lead to the cavitation collapse, strengthens the cavitation effect. Although the device is simple in structure, energy loss is large, and key components can be damaged quickly.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a multi-combination hydrodynamic cavitation device, which treats domestic sewage by controlling the formation of cavitation bubbles for many times, wherein the cavitation bubbles are used as independent chemical micro-reactors, and physical and chemical changes caused by the collapse of the cavitation bubbles are utilized to quickly treat fluid.

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

A multi-combination hydrodynamic cavitation device comprises a shell, a rotary cavitation generating device and a fixed cavitation device; a rotational cavitation generating device is supported in the housing for generating at least 2 cavitation zones; the rotary cavitation generating device is connected with the power part; the fixed cavitation device is positioned at the outlet of the shell and is used for generating secondary cavitation.

Further, the shell is divided into a cavitation generating area I and a cavitation collapse area II by the rotary cavitation generating device, and the cavitation generating area I is positioned at the inlet of the shell and is used for generating at least 2 cavitation generating areas; and the cavitation collapse area II is positioned in front of the input end of the fixed cavitation device and is used for collapsing cavitation before entering the fixed cavitation device.

Further, the cavitation rotating device comprises a rotating disk, a hollow shaft and a transmission shaft; the two ends of the rotating disc are respectively connected with a hollow shaft and a transmission shaft, the hollow shaft is supported in the inlet of the shell, and the transmission shaft is supported in the outlet of the shell; the hollow shaft and the gradually-expanded wall surface close to the inlet of the shell form a first cavitation generation area I-1, an inner hole of the hollow shaft is communicated with the inlet of the shell, and a plurality of holes communicated with the inner hole are formed in the hollow shaft;

a plurality of grooves are formed in the outer circle of the rotating disc, and a second cavitation generation area I-2 is formed in a narrow and long space between the outer circle surface of the rotating disc and the wall surface of the shell;

the end face of the rotating disc connected with the transmission shaft is a curved surface, and the curved surface and the gradually-reduced wall surface close to the outlet of the shell form a cavitation collapse area II.

Furthermore, the holes on the hollow shaft are uniformly distributed in the circumferential direction and are distributed in an axially staggered manner; the number of the holes on the same circumference is more than or equal to 3, and the number of the rows of the holes in the axial direction is more than or equal to 2.

Further, the groove of the outer circle of the rotating disc is a pit or an annular groove; the number of rows of the grooves is at least 2.

Further, the curved surface is an arc surface or a spherical surface or a semi-elliptical surface.

Furthermore, a replaceable chamber body is arranged close to the inlet of the shell, and the interior of the replaceable chamber body is a gradually-changed arc surface or a step surface or a conical surface and is used for forming a gradually-expanded wall surface; the tapered wall surface close to the outlet of the shell is a gradually changed arc surface.

Furthermore, the interior of the replaceable hearth body is a conical surface, and the cone angle of the conical surface is 45-75 degrees.

Further, the fixed cavitation device is a supporting pore plate uniformly distributed with a plurality of rows of holes.

The invention has the beneficial effects that:

1. the multi-combination hydrodynamic cavitation device can generate at least 2 cavitation areas through the rotating cavitation generating device, and multiple times of cavitation can be realized.

2. The multi-combination hydrodynamic cavitation device realizes repeated generation and collapse of cavitation through the rotary cavitation generating device and the fixed cavitation device.

3. The multi-combination hydrodynamic cavitation device disclosed by the invention is small in occupied space, simple to operate and high in production efficiency.

4. The multi-combination hydrodynamic cavitation device disclosed by the invention realizes multiple cavitation forms by combining the grooves and the holes.

5. The multi-combination hydrodynamic cavitation device provided by the invention can be applied under multiple working conditions through the replaceable rifles in various forms.

6. The multi-combination hydrodynamic cavitation device provided by the invention provides power by driving the rotary cavitation generating device to rotate through the motor, so that the purposes of energy supply and rapid fluid change are achieved.

Drawings

Fig. 1 is a schematic structural diagram of a multi-combination hydrodynamic cavitation device according to the present invention.

FIG. 2 is a front view of a support orifice plate according to the present invention.

Fig. 3 is a cross-sectional view of a cavitation spin device in accordance with the present invention.

Fig. 4 is a cross-sectional view of 3 versions of the replaceable rifling body of the present invention.

FIG. 5 is a cross-sectional view of a rotating disk according to an embodiment of the present invention.

In the figure:

1-a first sleeve; 2-left shell; 3-a rotating cavitation generating device; 4-right shell; 5-end flange; 6-fixing a cavitation device; 7-a second shaft sleeve; 8-bolt; 9-a motor; 10-a replaceable chamber body; 301-hole; 302-rotating the disc; 303-grooves; 304-curved surface; 305-a hollow shaft; 306-drive shaft.

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, the multi-combination hydrodynamic cavitation device of the present invention comprises a housing, a rotating cavitation generator 3 and a fixed cavitation device 6; the shell comprises a left shell 2, a right shell 4 and an end flange 5, wherein the left shell 2, the right shell 4 and the end flange 5 are sequentially installed through flange structures, the left shell 2 is a shell inlet, and the end flange 5 is a shell outlet; the fixed cavitation device 6 is clamped between the right shell 4 and the end flange 5, the first shaft sleeve 1 is installed in the left shell 2, the second shaft sleeve 7 is arranged in the fixed cavitation device 6, and the rotary cavitation generating device 3 is supported between the first shaft sleeve 1 and the second shaft sleeve 7 and is used for generating at least 2 cavitation areas; the rotary cavitation generating device 3 is connected with a motor 9.

The shell is divided into a cavitation generating area I and a cavitation collapse area II by the rotary cavitation generating device 3, and the cavitation generating area I is positioned at the inlet of the shell and is used for generating at least 2 cavitation generating areas; and the cavitation collapse area II is positioned in front of the input end of the fixed cavitation device 6 and is used for collapsing cavitation before entering the fixed cavitation device 6.

As shown in fig. 3, the cavitation rotation device 3 includes a rotation disk 302, a hollow shaft 305, and a drive shaft 306; the two ends of the rotating disc 302 are respectively connected with a hollow shaft 305 and a transmission shaft 306, the hollow shaft 305 is supported in the first shaft sleeve 1, the transmission shaft 306 is supported in the second shaft sleeve 7, and the transmission shaft 306 passes through the second shaft sleeve 7 and is connected with the motor 9.

The hollow shaft 305 and a gradually expanding wall surface close to the inlet of the shell form a first cavitation generation area I-1, an inner hole of the hollow shaft 305 is communicated with the inlet of the shell, and a plurality of holes 301 communicated with the inner hole are formed in the hollow shaft 305; the holes 301 on the hollow shaft 305 are uniformly distributed in the circumferential direction and are distributed in an axially staggered manner; the number of the holes 301 on the same circumference is more than or equal to 3, and the number of the rows of the holes 301 in the axial direction is more than or equal to 2, so that the vibration of the shaft is reduced, and the rigidity of the shaft is ensured to the maximum extent.

As shown in fig. 3 and 4, a replaceable bore body 10 is mounted in the left housing 2 through a bolt 8, and the interior of the replaceable bore body 10 is a gradually changing arc surface 10a or a stepped surface 10b or a tapered surface 10c for forming a gradually expanding wall surface; when the inner part of the replaceable rifling body 10 is a conical surface 10c, the conical angle of the conical surface 10c is 45-75 degrees.

A plurality of grooves 303 are formed in the outer circle of the rotating disc 302, and a second cavitation generation area I-2 is formed in a narrow space between the outer circle surface of the rotating disc 302 and the wall surface of the shell; the groove 303 of the outer circle of the rotating disc 302 is a pit or an annular groove; the number of rows of the grooves 303 is at least 2.

As shown in fig. 3 and 5, the end face of the rotating disc 302 connected to the transmission shaft 306 is a curved surface 304, and the curved surface 304 and the tapered wall surface near the outlet of the housing form a cavitation collapse zone ii. The curved surface 304 is an arc surface, a spherical surface or a semi-elliptical surface. The tapered wall surface near the housing outlet is a tapered arc surface in the right housing 4.

In order to create the most suitable conditions for the pulsation and collapse of bubbles, the multi-combination hydrodynamic cavitation device comprises a plurality of low-pressure-area cavitation areas and cavitation collapse areas, wherein the low-pressure-area cavitation areas comprise an orifice 301 on a cavitation rotating device 3, a gradually expanding surface on a replaceable hearth body 10, a narrow space formed by the outer circular surface of a rotating disc 302 and a shell, a plurality of rows of orifices on a supporting orifice plate and the center of a curved surface 304 on the end surface of the rotating disc 302; cavitation bubbles are generated in the low pressure region and collapse in the high pressure region. The number of the cavitation bubble generation area and the cavitation bubble collapse area of the device is not less than 5, and the overall efficiency of fluid transformation is determined.

The working principle of the invention is as follows:

the fluid enters the first cavitation generating area I-1 from the hole 301 of the rotary cavitation generating device 3, the flow velocity is increased due to the contraction of the interface at the hole 301 of the fluid, the pressure intensity is reduced to be equal to the saturated steam pressure according to the Bernoulli equation, cavitation starts to be generated, the fluid enters the first cavitation generating area I-1, the flow velocity is reduced and the pressure is increased due to the fact that the section of the replaceable chamber body 10 is enlarged, and a small part of bubbles are broken out due to the fact that the pressure is instantly increased. The replaceable hearth body 10 in the first cavitation generation area I-1 is a gradually-changed arc surface 10a or a step surface 10b or a conical surface 10c, pressure changes due to the change of a cross section and the generation of vortices, cavitation can be generated when the pressure is reduced to saturated vapor pressure, the generated cavitation breaks out in a working cavity, the pressure and the temperature are increased due to the break-out of bubbles, harmful substances in domestic sewage are subjected to physical and chemical effects, and the quality of fluid is improved.

Most of the cavitated fluid enters the second cavitation generation zone I-2, namely a circumferential narrow space formed by the groove 303 and the shell, and due to contraction and expansion of the cross section of the cavitation generation zone, vortex and cavitation phenomena are generated in the fluid flow, namely further enhanced cavitation. The fluid after strengthening cavitation enters the tapered arc surface in the right shell 4, partial cavitation can be generated under the stirring action of the curved surface 304, then the fluid enters the cavitation collapse area II, the generated cavitation is collapsed in the cavitation collapse area II, the physical and chemical actions caused by the collapse of bubbles are exerted on the domestic sewage, the consistency of the fluid solution is further improved, then the cavitation is generated again at the supporting orifice plate, the fluid flows out from the outlet, and finally the aim of cavitation and degradation of harmful substances is achieved. Multiple cavitations are thus achieved.

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. A multi-combination hydrodynamic cavitation device is characterized by comprising a shell, a rotary cavitation generating device (3) and a fixed cavitation device (6); a rotating cavitation generating device (3) is supported in the shell and is used for generating cavitation for at least 2 times; the rotary cavitation generating device (3) is connected with the power part; the fixed cavitation device (6) is positioned at the outlet of the shell and is used for generating secondary cavitation; the shell is divided into a cavitation generating area I and a cavitation collapse area II by the rotary cavitation generating device (3), and the cavitation generating area I is positioned at the inlet of the shell and comprises at least 2 cavitation generating areas; the cavitation collapse area II is positioned in front of the input end of the fixed cavitation device (6) and is used for collapsing cavitation before entering the fixed cavitation device (6); the rotary cavitation generating device (3) comprises a rotary disk (302), a hollow shaft (305) and a transmission shaft (306); the two ends of the rotating disc (302) are respectively connected with a hollow shaft (305) and a transmission shaft (306), the hollow shaft (305) is supported in the inlet of the shell, and the transmission shaft (306) is supported in the outlet of the shell; the hollow shaft (305) and a gradually-expanding wall surface close to the inlet of the shell form a first cavitation generation area I-1, an inner hole of the hollow shaft (305) is communicated with the inlet of the shell, and a plurality of holes (301) communicated with the inner hole are formed in the hollow shaft (305);

a plurality of grooves (303) are formed in the outer circle of the rotating disc (302), and a narrow space between the outer circle surface of the rotating disc (302) and the wall surface of the shell forms a second cavitation generation area I-2;

the end face of the rotating disc (302) connected with the transmission shaft (306) is a concave curved surface (304), the curved surface (304) and a tapered wall surface close to the outlet of the shell form a cavitation collapse area II, and the holes (301) in the hollow shaft (305) are uniformly distributed in the circumferential direction and are distributed in an axially staggered manner.

2. Multi-combination hydrodynamic cavitation device according to claim 1, characterized in that the number of holes (301) on the same circumference is not less than 3 and the number of rows of holes (301) in the axial direction is not less than 2.

3. The multi-combination hydrodynamic cavitation device according to claim 1, wherein the grooves (303) of the outer circle of the rotating disc (302) are dimples; the number of rows of the grooves (303) is at least 2.

4. The multi-combination hydrodynamic cavitation device according to claim 1, wherein the curved surface (304) is a spherical surface or a semi-elliptical surface.

5. The multi-combination hydrodynamic cavitation device according to claim 1, wherein a replaceable bore body (10) is installed near the housing inlet, and the interior of the replaceable bore body (10) is a gradually changing arc surface (10 a) or a stepped surface (10 b) or a conical surface (10 c) for forming a gradually expanding wall surface; the tapered wall surface close to the outlet of the shell is a gradually changed arc surface.

6. The multi-combination hydrodynamic cavitation device according to claim 5, characterized in that the inside of the replaceable rifling body (10) is a tapered surface (10 c), and the taper angle of the tapered surface (10 c) is 45 ° to 75 °.

7. The multi-combination hydrodynamic cavitation device according to claim 1, wherein the stationary cavitation device (6) is a supporting orifice plate with a plurality of rows of orifices distributed uniformly.