CN218226175U

CN218226175U - Low-pressure large-flow gas-mixing self-excitation pulse double-cavitation erosion jet flow generating device and cleaning device

Info

Publication number: CN218226175U
Application number: CN202222375618.9U
Authority: CN
Inventors: 不公告发明人
Original assignee: Beijing Osia Waveguide Technology Co ltd
Current assignee: Hebei Weikailan Technology Co ltd
Priority date: 2022-09-07
Filing date: 2022-09-07
Publication date: 2023-01-06
Anticipated expiration: 2032-09-07

Abstract

The utility model relates to a low-pressure large-flow gas-mixed self-excited pulse double-cavitation jet flow generating device and a cleaning device, wherein an oscillation turbulence cavity is provided with a gas inlet and a gas outlet, a liquid inflow hole is arranged on one side wall of the oscillation turbulence cavity, an inlet end and an outlet end are respectively connected with the gas inlet and the gas outlet in a sealing way, and the axial centers of the inlet end and the outlet end are respectively provided with a conveying gas inlet hole and a conveying gas outlet hole correspondingly; the conveying gas path pipeline is positioned in the self-excitation pulse cavity, two ends of the conveying gas path pipeline are respectively and correspondingly communicated with the conveying gas inlet hole and the conveying gas outlet hole, and the outer wall of the conveying gas path pipeline is provided with a collision structure; the outlet end is provided with a jet hole communicated with the inner cavity of the oscillating turbulent flow cavity; the spraying cylinder is provided with a large head end and a small head end, and the large head end of the spraying cylinder is connected with the outlet end and is simultaneously communicated with the jet hole and the conveying air outlet hole. The utility model discloses can be under low pressure, large-traffic, the nothing submerges operating condition, produce powerful cavitation effect, realize that the gas mixes the washing of the two cavitation erosion efflux of self-excited pulse, cleaning efficiency is high, the cleaning performance is good.

Description

Low-pressure large-flow gas-mixing self-excitation pulse double-cavitation erosion jet flow generating device and cleaning device

Technical Field

The utility model relates to a self-excited pulse cavitation efflux technical field especially relates to big flow gas of low pressure mixes two cavitation erosion efflux generating device of self-excited pulse and belt cleaning device.

Background

At present, in the domestic cleaning industry, when the surfaces of various construction projects, mechanical devices and transportation tools on land and water are cleaned, the cleaning methods generally adopted include manual cleaning, chemical cleaning, high-pressure water cleaning, pill (spray) polishing, dry sand blasting, mortar wet sand blasting and the like. In the implementation process of the cleaning methods, the defects of high labor intensity, low working efficiency, high operation cost, poor cleaning effect, environmental pollution, unsafety, damage to cleaned equipment and the bodies of constructors and the like exist, and the cleaning effect is influenced. At present, the national requirements for environmental protection are more and more strict, and the attack on enterprises causing environmental pollution is increased. Many related enterprises have already abandoned the cleaning technology, and have searched for new efficient and green cleaning technologies to replace the technology, so as to meet the environmental protection requirements and production requirements.

The self-excited pulse cavitation jet is an effective cleaning mode, the current domestic self-excited pulse cavitation jet technology is realized under the submerging condition and in the water environment outside the cavitation nozzle within a certain target distance, and the domestic technology is only tried in the drilling field in a certain range under the water environment. Because the mechanism of pulse and cavitation effect generation is relatively complex, underwater cleaning has not been practically applied so far. The invention patent of patent No. CN113530447A discloses a wall-attached self-excited pulse jet device, a perforation device and a rock breaking device, which comprises an upper joint, an outer cylinder and a self-excited oscillation core arranged in the outer cylinder; after the fluid flows through the upper joint and the self-oscillation core in sequence, the self-oscillation core forms the fluid into self-oscillation pulse jet flow and outputs the self-oscillation pulse jet flow; the method mainly relates to the field of efficient drilling and fracturing yield increase of petroleum engineering, and belongs to the trial of the field of drilling under a submerged condition. At present, no report and application about cleaning the outside of an object by adopting a cavitation jet technology under a non-submerged condition are seen at home and abroad.

Under the submerging condition, the self-excited pulse cavitation jet generating device can generate pulse jet from continuous jet, and in order to improve the cleaning effect, the prior art improves the scouring performance by forming water-gas two-phase self-excited pulse mixed jet; for example, the invention patent with the patent number CN102989613A discloses a self-excited pulse aeration nozzle, which comprises a water inlet nozzle, an oscillation cavity, a pulse nozzle, a reflection cone, an air suction cavity, an air suction hole and a jet pipe, and the principle is that the self-excited oscillation of the energy of water jet flowing into the nozzle is utilized to suck air, water and air are mixed in the nozzle and then are changed into water-air two-phase bubble flow or mist flow, and then the water-air two-phase bubble flow or mist flow is sprayed out of the nozzle; but the structure is simpler, and the problems of poor cavitation effect and small impact force exist. The self-excited pulse cavitation jet generating device and the water-gas two-phase self-excited pulse mixed jet device in the prior art, a cleaning system and the cavitation generating device can only be used for certain single-purpose operation under water environment, and can not clean large steel structures, nonmetal buildings, ship outer plates, paint (rust), marine organisms (docks) and the like on land under the condition of no submergence.

Therefore, the problem to be solved by the skilled person is to provide a low-pressure high-flow self-excited air mixing self-excited pulse double-cavitation erosion jet generating device and a cleaning device which can be used for effectively cleaning large steel structures, non-metal buildings, ship outer plates, paint (rust) and marine life (dock) under a non-submerged condition (land).

Disclosure of Invention

The utility model aims to solve the technical problem that a mixed self-excited pulse double cavitation erosion jet generating device of low pressure large-traffic gas and belt cleaning device are provided, can be under low pressure, large-traffic, the nothing submerges operating condition, produce powerful cavitation effect, realize that gas mixes the washing of the mixed self-excited pulse double cavitation erosion jet, the cleaning efficiency is high, the cleaning performance is good.

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

the low-pressure high-flow gas-mixing self-excited pulse double-cavitation jet flow generating device comprises a self-excited pulse cavity, a conveying gas path pipeline and a jet cylinder, wherein the self-excited pulse cavity comprises an oscillation turbulence cavity, an inlet end and an outlet end, two opposite ends of the oscillation turbulence cavity are provided with a gas inlet and a gas outlet, a liquid inlet hole is formed in one side wall of the oscillation turbulence cavity, the inlet end and the outlet end are respectively connected to the gas inlet and the gas outlet in a sealing mode, and the centers of the inlet end and the outlet end are respectively and correspondingly provided with a conveying gas inlet hole and a conveying gas outlet hole; the conveying gas path pipeline is positioned in the self-excitation pulse cavity, two ends of the conveying gas path pipeline are respectively and correspondingly communicated with the conveying gas inlet hole and the conveying gas outlet hole, and the outer wall of the conveying gas path pipeline is provided with a collision structure forming a fluid mechanics turbulence phenomenon; the outlet end is provided with a jet hole communicated with the inner cavity of the oscillating turbulent flow cavity corresponding to the periphery of the conveying air outlet hole; the spraying cylinder is provided with a large head end and a small head end, and the large head end of the spraying cylinder is connected with the outlet end head and is simultaneously communicated with the jet hole and the conveying air outlet hole.

The utility model has the advantages that: pressure gas or a mixture of the pressure gas and abrasive materials enters a conveying gas path pipeline through a conveying gas inlet hole at an inlet end, and pressure liquid (water) enters an inner cavity of the oscillating turbulent flow cavity from a liquid inflow hole; the pressure liquid (water) generates two cavitation effects in the oscillating turbulent flow cavity and the spray cylinder.

The cavitation effect means that when the local pressure at a certain position along an object is lower than the saturated vapor pressure of a medium in high-speed motion of the medium, the medium starts to be gasified to form cavitation bubbles, the cavitation bubbles collapse after reaching a high-pressure area, and simultaneously, compression waves or micro-jet flows are generated to erode the surface of a nearby solid, and the cavitation (cavitation) is to enhance the cleaning and crushing capability of the medium by utilizing the cavitation effect.

Specifically, a self-excited pulsating negative pressure state is formed by the pressure liquid in the oscillating turbulent flow cavity due to the influence of resistance, the local absolute pressure in the system is reduced to be below the steam pressure, the liquid separation phenomenon occurs when the pressure liquid bypasses a central body, an instant phase change process can be generated, a wake flow full of a vortex is generated, cavitation bubbles are inoculated in the center of the vortex and are primarily generated, a cavitation effect function is generated, strong self-excited liquid-gas pulsating flow is generated through the cavitation effect, and liquid-gas pulse jet flow is formed through a jet hole; meanwhile, pressure liquid forms a hydrodynamic turbulence phenomenon in the oscillation turbulence cavity under the action of the collision body, namely turbulence is artificially caused, and pressure oscillation and the existence of a large-scale vortex ring structure in a certain range are favorable for generating cavitation bubbles so as to generate a first cavitation effect. The first cavitation erosion jet flow of the jet hole generates a cavitation effect again in the large head end of the jet cylinder, the conveying gas path pipeline utilizes the compressibility of air, so that pressure gas enters the conveying gas path pipeline at a certain frequency, compressed air is converged with the first cavitation erosion jet flow of the jet hole at the large head end of the jet cylinder, along with the compression and expansion of the air, turbulence in the cylinder is intensified, the shearing force of water flow is intensified, the effect is further intensified under the interference of air flow, and cavitation jet flow is formed again. Therefore, the single cavitation jet formed at the outlet end of the cavity by the turbulent flow and the differential pressure of the cavity and the cavitation jet formed secondarily are converged at the ejector cylinder to form a large-scale cavitation effect, namely, the gas-mixed self-excited pulse double cavitation jet. Because the pulse releases energy in a centralized way, the high-speed momentum of the airflow is quickly converted into impulse to form shell flow, so that the impact and cavitation effects are generated on the surface of the cleaned target piece, and dirt is effectively removed; the utility model introduces a new power source by adding an air mixing device, the liquid-air pulse jet flow of the jet hole is mixed with the pressure air (or the pressure air and the abrasive material), and double cavitation jet flows are formed by two times of cavitation effects, so that the impact force and the cleaning efficiency of the jet flow are improved; under the condition of no submergence, the continuous jet beam provided by the pump pressure forms an air-mixed pulse double cavitation erosion jet beam, the working pressure is greatly lower than that of the existing high-pressure water sand blasting device, engineering facilities and vehicles such as land large-scale steel structures, non-metal buildings, ship planking, paint (rust), marine life (dock) and the like can be effectively cleaned, and the cleaning efficiency and the cleaning effect are improved.

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

Further, the gas inlet device also comprises a gas inlet pipeline which is communicated with the gas inlet hole.

The beneficial effect of adopting the further scheme is that: the pressure gas or the mixture of the pressure gas and the grinding material (frosted sand) enters the gas conveying pipeline from the gas conveying inflow pipeline.

Further, the inner wall of the gas input flow pipeline is provided with a gas-material mixing spiral conveying groove, and the inlet of the gas input flow pipeline is provided with a pneumatic valve.

The beneficial effect of adopting the further scheme is that: the spiral conveying groove is used for uniformly mixing the pressure gas and a cleaning medium such as abrasive, and the pneumatic valve controls the pressure gas to enter the gas conveying inflow pipeline at a certain frequency.

Furthermore, the inlet end and the outlet end are both in a circular truncated cone shape, the small end of each inlet end is provided with threads and is in threaded connection with the two end parts of the pipeline corresponding to the conveying gas path respectively, and the large end of each inlet end is in sealed connection with the inner wall of the gas inlet and the gas outlet respectively.

The beneficial effect of adopting the further scheme is that: the round table surfaces of the inlet end and the outlet end and the conveying gas path pipeline enclose an oscillating turbulent flow cavity, and the big end is connected with the gas inlet and the gas outlet in a sealing mode and used for sealing water and gas.

Further, the collision structure is a threaded structure.

The beneficial effect of adopting the further scheme is that: the pressure liquid collides with the thread structure in the oscillating turbulent flow cavity to form a fluid mechanics turbulent flow phenomenon, namely, the turbulent flow is artificially caused.

Further, the end face of the big head end of the outlet end is set to be a concave face;

further, a spiral structure may be provided on the concave surface.

The beneficial effect of adopting the further scheme is that: forming primary cavitation jet flow in the oscillation turbulent flow cavity due to turbulence and pressure difference; the end face of the big end of the outlet end is set to be a concave face, namely the end face corresponding to the outlet end of the jet hole is set to be a concave face, the water jet generates a cavitation effect again in the concave face and the big end of the jet cylinder, the cavitation effect is further enhanced under the interference of air flow, and cavitation jet is formed again. Therefore, the single cavitation jet formed at the outlet end of the cavity by the turbulent flow and the differential pressure of the cavity and the cavitation jet secondarily formed by the interference of the turbulent flow and the air flow generated by the concave surface at the outer end surface of the outlet are converged in the ejector to form a large-scale cavitation effect, namely, the air-mixed self-excited pulse double cavitation jet; the concave spiral structure further enhances the secondary cavitation effect.

Further, the round table surfaces of the inlet end and the outlet end are provided with spiral structures for reinforcing turbulent flow; the inner wall of the liquid inflow hole is provided with a spiral structure for reinforcing turbulent flow, and liquid enters the inner cavity of the oscillating turbulent flow cavity along the tangential direction of the inner wall surface of the oscillating turbulent flow cavity.

The beneficial effect of adopting the above further scheme is: through the helical structure of round platform face and liquid inflow hole, when pressure liquid gets into in the oscillation turbulence cavity, play the effect of reinforcing pressure liquid turbulent flow, and pressure liquid gets into annular cavity along the tangent line in, strengthen the turbulent flow effect of rivers in annular cavity, strengthen the cavitation effect.

Further, the self-excitation pulse cavity is cylindrical, the length of the self-excitation pulse cavity is 30-60mm, the diameter of the self-excitation pulse cavity is 20-40mm, and an included angle alpha between a circular table surface of the inlet end and the outlet end and the oscillating turbulent flow cavity is smaller than 60 degrees; the thickness (length along the axial direction of the central line of the excitation oscillation cavity) of the inlet end and the outlet end is 2-10mm, and the diameters of the conveying air inlet hole and the conveying air outlet hole are 20-40mm; the thread pitch of the thread structure is 1-1.5mm, and the depth is 15-22.5mm.

The beneficial effect of adopting the further scheme is that: the included angle between the circular table surface and the oscillation turbulent flow cavity is limited to be less than 60 degrees, and the cavitation effect of the pressure liquid (water) in the oscillation turbulent flow cavity is further facilitated.

Further, the outer wall of the large head end of the spray cylinder is provided with an air inlet hole.

The beneficial effect of adopting the further scheme is that: the air is introduced into the external air through the air inlet hole, so that the mixing of air flow and cavitation water is further enhanced, and the cleaning effect is improved by generating a large amount of bubbles after mixing.

The utility model also discloses a low-pressure large-flow gas-mixed self-excited pulse double-cavitation jet cleaning device, which comprises an operation platform bracket, a power-assisted mechanical arm, a vertical rotating device, a horizontal rotating device, a balancing weight and the low-pressure large-flow gas-mixed self-excited pulse double-cavitation jet generating device; the middle part of the power-assisted mechanical arm is rotatably connected with the operating platform support, the two ends of the power-assisted mechanical arm are oppositely connected with the balancing weight and the vertical rotating device, the vertical rotating device rotates along a vertical plane, the rotating end of the vertical rotating device is connected with the horizontal rotating device, and the horizontal rotating device rotates along a horizontal plane, and the rotating end of the horizontal rotating device is connected with the low-pressure large-flow air-mixed self-excited pulse double-cavitation jet generating device.

Adopt the utility model discloses big flow gas of low pressure mixes two cavitation erosion efflux belt cleaning devices of auto-excitation pulse beneficial effect is: the cleaning device is low in pressure, safe, environment-friendly and efficient; because the working pressure is low, the problem that the recoil of a high-pressure cleaning gun is large and automatic cleaning is difficult to realize is solved, and the problem that gas-mixed self-excited pulse double cavitation jet flow is realized for cleaning under the non-submerged condition is solved; the operation is simple and rapid, and the actions of lifting, pushing and pulling, rolling, inclining and the like of the low-pressure large-flow air-mixed self-excited pulse double cavitation jet flow generating device are completed along with the traction force of an operator; the distance and the angle are appropriate during cleaning operation, and the cleaning machine can move with universal assistance and can also be driven by electric rotation; the work efficiency is effectively improved, the labor intensity of workers is reduced, and the number of operators is reduced.

Via the above technical scheme, compare with prior art, the beneficial effects of the utility model are that:

the utility model discloses the mixture of pressure gas or pressure gas and abrasive material gets into the conveying gas circuit pipeline through the conveying gas manhole of import end, pressure liquid (water) gets into the inner chamber of self-excitation pulse cavity from the liquid inflow hole, collide at the inner chamber and collide the structure and form hydrodynamics vortex phenomenon and form the cavitation jet and get into the big head end of ejector nozzle through the jet hole, the big head end of this structure is cavitation jet collection district, pressure gas passes through conveying gas circuit pipeline and conveying gas outlet and further cavitates with liquid in cavitation jet collection district and form the secondary cavitation jet, promptly along with the compression and the expansion of air, make the turbulent flow aggravation in the ejector nozzle, the shearing force enhancement of rivers forms stronger cavitation effect; because the pulse releases energy in a centralized way, the high energy momentum of the airflow is quickly converted into impulse to form cannonball flow, so that the impact and cavitation effects are generated on the surface of the cleaned target piece, and the dirt is effectively removed. The cleaning efficiency is improved by 20-40% compared with the self-excitation pulse jet impact force of the air-free mixing device under the same working condition.

Wherein, the main vacuole growth process: the outer wall of a conveying gas path pipeline positioned in the self-excited oscillation cavity is provided with a collision structure, pressure liquid is subjected to collision cavitation to form primary cavitation jet flow, and turbulent flow and cavitation are further intensified to form secondary cavitation jet flow due to instantaneous pressure change and air compression and expansion from a jet hole; secondly, the spiral structure of the liquid inflow hole, the shape of the inlet end and the outlet end corresponding to the inner cavity side of the self-excitation oscillation cavity and the like further intensify the turbulence and cavitation effects.

Drawings

FIG. 1 is a cross-sectional view of the low-pressure large-flow gas-mixed self-excited pulse double cavitation jet generator of the present invention;

FIG. 2 is an enlarged partial view A of FIG. 1;

FIG. 3 is an enlarged partial view B of FIG. 1;

fig. 4 is a schematic structural diagram of an outlet end of the low-pressure large-flow gas-mixed self-excited pulse double cavitation erosion jet flow generating device of the present invention;

fig. 5 is a schematic structural diagram of the low-pressure large-flow gas-mixed self-excited pulse double-cavitation jet cleaning device of the present invention.

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

1-self-excitation pulse cavity; 2-conveying gas path pipeline; 3-spraying a cylinder; 4-a liquid inflow hole; 5-an input gas flow duct; 6-pneumatic valves; 7-a sealing ring; 11-oscillating turbulent flow cavity; 12-an inlet end; 13-an outlet end; 21-a collision structure; 31-air inlet holes; 100-a power-assisted mechanical arm; 131-a jet hole; 200-a balancing weight; 300-vertical rotation means; 400-horizontal rotation device.

Detailed Description

The principles and features of the present invention will be described with reference to the drawings, which are provided for illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1 to 4, the embodiment of the utility model discloses a two cavitation erosion efflux generating device of low pressure large-traffic gas mixture self-excited pulse, including self-excited pulse cavity 1, conveying gas circuit pipeline 2 and ejector 3, self-excited pulse cavity includes oscillation turbulence cavity 11, import end 12 and export end 13, the opposite both ends of oscillation turbulence cavity 11 have gas inlet and gas outlet and have liquid influent orifice 4 on a lateral wall, import end 12 and export end 13 respectively sealing connection in gas inlet and gas outlet department and its axial center correspond respectively and set up conveying gas inlet hole and conveying gas outlet hole; the conveying gas path pipeline 2 is positioned in the self-excitation pulse cavity 1, two ends of the conveying gas path pipeline are respectively and correspondingly communicated with a conveying gas inlet hole and a conveying gas outlet hole, and the outer wall of the conveying gas path pipeline is provided with a collision structure 21 for forming a fluid mechanics turbulent flow phenomenon; the outlet end 13 is provided with a jet hole 131 communicated with the inner cavity of the oscillating turbulent flow cavity 11 corresponding to the periphery of the conveying air outlet; the ejector 3 has a large head end and a small head end, and the large head end of the ejector 3 is connected with the outlet end 13 and simultaneously communicated with the jet hole 131 and the delivery air outlet hole. The length of the spray cylinder 3 is 100-300mm, and the diameter is 10-40mm; the number of the jet holes 131 is 2-6, and the diameter is 0.6-1.5mm.

In order to further optimize the technical scheme, the device also comprises a gas input pipeline 5, and the gas input pipeline 5 is communicated with the conveying gas inlet hole. The pipe diameter of the gas input inflow pipeline 5 is larger than that of the gas conveying pipeline 2, the gas conveying inlet hole is provided with an inner conical surface, the large-diameter end of the gas input inflow pipeline is communicated with the gas input inflow pipeline 5, and the small-diameter end of the gas input inflow pipeline is communicated with the gas conveying pipeline 2.

In order to further optimize the technical scheme, a gas-material mixing spiral conveying groove is arranged on the inner wall of the gas inlet pipeline 5, and a pneumatic valve 6 is installed at the inlet of the gas inlet pipeline.

In order to further optimize the above technical solution, as shown in fig. 1 and 4, the inlet end 12 and the outlet end 13 are both in a truncated cone shape, and the small ends thereof are provided with threads and respectively connected with two ends of the corresponding gas transmission pipeline 2 by threads, and the large ends thereof are respectively connected with the inner walls of the gas inlet and the gas outlet in a sealing manner. The big end of the inlet end 12 and the big end of the outlet end 13 are respectively connected with the inner walls of the air inlet and the air outlet in a sealing way through the sealing ring 7.

In order to further optimize the above technical solution, the collision structure 21 is a threaded structure.

In order to further optimize the above solution, as shown in fig. 1, the outlet tip 13 is concave near the end surface of the spray cylinder 3.

In order to further optimize the above technical solution, as shown in fig. 1 to 4, the circular table surfaces of the inlet end 12 and the outlet end 13 are both provided with a helical structure for enhancing turbulent flow; the inner wall of the liquid inflow hole 4 is provided with a spiral structure for enhancing turbulent flow, and liquid enters the inner cavity of the oscillating turbulent flow cavity 11 along the tangential direction of the inner wall surface thereof. The jet hole 131 is obliquely arranged from the circular truncated cone surface of the outlet end 13 to the arc concave surface of the circular truncated cone surface; the pipe diameter of the large head end of the spray cylinder 3 is larger than that of the conveying gas path pipeline 2; the pipe diameter of the large end of the spray cylinder 3 is larger than that of the small end thereof, and a smooth contraction section of the pipe diameter is arranged between the large end and the small end of the spray cylinder 3.

In order to further optimize the technical scheme, as shown in fig. 1, the self-excited pulse cavity 1 is cylindrical, the length is 30-60mm, the diameter is 20-40mm, and an included angle alpha between the circular table surfaces of the inlet end 12 and the outlet end 13 and the oscillating turbulent flow cavity 11 is less than 60 degrees; the thickness of the inlet end 12 and the outlet end 13 is 2-10mm, and the diameter of the conveying air inlet hole and the conveying air outlet hole is 20-40mm; the thread pitch of the thread structure is 1-1.5mm, and the depth is 15-22.5mm.

In order to further optimize the above technical solution, as shown in fig. 1, an air inlet hole 31 is provided on the outer wall of the large head end of the spray cylinder 3. 2-4 air inlet holes 31 with the diameter of 2-5mm.

In a specific embodiment, the housing of the self-excited pulse chamber 1 and the outer housing of the coating nozzle 3 are integrally formed.

In a specific embodiment, the inlet end 12, the outlet end 13 and the air delivery pipe 2 are integrally formed.

When the low-pressure large-flow gas-mixing self-excited pulse double-cavitation jet flow generating device is used, pressure liquid enters the oscillating turbulent flow cavity 11 from the liquid inflow hole 4, and firstly, the pressure liquid passes through the spiral structure of the liquid inflow hole 4 and the spiral structures of the circular table top at the inlet end 12 and the outlet end 13, so that the turbulent flow effect is enhanced and the turbulent flow is formed; secondly, pressure liquid enters the annular cavity of the oscillating turbulent flow cavity 11 along the tangential direction of the inner wall of the oscillating turbulent flow cavity to strengthen the turbulent flow effect and the cavitation effect; thirdly, the pressure liquid collides with a collision structure 21 on the outer wall of the conveying gas path pipeline 2 to form a turbulent flow phenomenon and a cavitation effect of fluid mechanics; the pressure liquid generates strong self-excitation liquid-gas pulsating flow through turbulence and cavitation in the oscillation turbulence cavity 11, forms primary cavitation jet flow through the jet hole 131 and obliquely enters a cavitation jet flow collecting area at the large head end of the ejector 3;

the pressure gas or the mixture of the pressure gas and the grinding materials enters the conveying gas path pipeline through the gas input pipeline 5, and the pressure gas and the grinding materials are fully and uniformly mixed in the gas input pipeline 5 under the action of the gas-material mixing spiral conveying groove; the pneumatic valve 6 controls pressure gas (or pressure gas and abrasive) to enter at a certain frequency, compress and expand along with the change of the pipe diameter, and after the pressure gas and the cavitation jet of the jet hole 131 are converged, the turbulence is intensified, and the shearing force of water flow is intensified to form stronger cavitation effect, namely secondary cavitation jet is formed; and the external air is introduced through the air inlet hole 31, so that the mixing of the air flow and the cavitation water is further enhanced, and the cleaning effect is improved by generating a large amount of bubbles after mixing.

The utility model discloses big flow capacity gas of low pressure mixes two cavitation erosion efflux generating device of auto-excitation pulse, increase the gas and mix the device and introduce new power supply, the jet hole 131 once cavitation erosion efflux mixes with pressure air (or pressure air and abrasive material) and forms the secondary cavitation erosion efflux, improves fluidic impact force and cleaning efficiency, cleaning efficiency than the air-free device auto-excitation pulse efflux impact force improvement 20-40% under the same operating mode; under the condition of no submergence, the continuous jet beam provided by the pump pressure forms a pulse cavitation jet beam, the working pressure is 15-38MPa, the pressure of domestic and foreign high-pressure water sand blasting equipment is more than 50MPa, the problem that the recoil of high-pressure cleaning is large and automatic cleaning is difficult to realize is solved due to low working pressure, and the advantage of effectively cleaning large steel structures, non-metal buildings, ship outer plates, paint (rust) and marine life (docks) is highlighted.

Example 1

As shown in fig. 5, the embodiment discloses a low-pressure high-flow air-mixed self-excited pulse double-cavitation jet cleaning device, which comprises an operation platform support, a power-assisted mechanical arm 100, a vertical rotating device 300, a horizontal rotating device 400, a counterweight 200 and the low-pressure high-flow air-mixed self-excited pulse double-cavitation jet generating device;

the middle of the power-assisted mechanical arm 100 is rotatably connected with the operating platform support, two ends of the power-assisted mechanical arm are oppositely connected with the balancing weight 200 and the vertical rotating device 300, the vertical rotating device 300 rotates along a vertical plane, the rotating end of the vertical rotating device 300 is connected with the horizontal rotating device 400, the horizontal rotating device 400 rotates along a horizontal plane, and the rotating end of the horizontal rotating device 400 is connected with the low-pressure large-flow air-mixing self-excitation pulse double cavitation jet generating device. The low-pressure large-flow gas-mixing self-excitation pulse double-cavitation erosion jet flow generating device and the rotating end of the horizontal rotating device 400 rotate relatively.

The power-assisted mechanical arm 100 adopts a movable shaft power-assisted mechanical arm, and completes the operations of lifting, pushing and pulling, turning, tilting and the like of the low-pressure large-flow air-mixing self-excitation pulse double-cavitation jet flow generation device by matching with the vertical rotation device 300 and the horizontal rotation device 400, so that the cleaning efficiency is improved; and the balancing weight 200 is used for balancing the weight, so that the time and the labor are saved during the cleaning operation.

The air-mixed cleaning medium enters from the inlet of the vertical rotating device 300 and is communicated with the gas input flow pipeline 5 of the generating device through an energy supply pipeline to form double cavitation jet flow with high impact force, so that the target piece is cleaned efficiently, the uniform rotating speed can be ensured, and the cleaning is comprehensive; and high hitting power is realized under the low-pressure working condition, and low-pressure efficient cleaning is realized.

The double cavitation erosion jet water and gas (abrasive) of the cleaning device of the utility model have better dispersibility, and the distribution of the surface cleanliness, the smoothness and the roughness of the cleaned object is more uniform; by optimizing the proportion of air, water and grinding materials (during paint and rust removal), the water and electricity consumption and the working pressure are reduced, and energy is saved; when the metal surface is washed, the grinding materials are conveyed and supplied, and the same water vapor power supply device is adopted to give consideration to sand conveying and enhanced cavitation effect, so that the metal surface is more beaten by the washing machine, and the washing efficiency is improved; and the water used by the cleaning medium can be recycled and the grinding material can be recycled or utilized, thereby greatly reducing the production cost.

As shown in table 1 below, compared with the foreign or domestic high-pressure water sand blasting equipment, the low-pressure high-flow air-mixing self-excited pulse double-cavitation jet cleaning device of the embodiment has the advantages that the working pressure is reduced, the difficult problem that the recoil of high-pressure cleaning is large and automatic cleaning is difficult to realize is overcome, and the cleaning rate, the energy and the abrasive consumption are obviously improved.

Table 1: the utility model discloses belt cleaning device contrasts with water under high pressure sand blasting equipment parameter

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

1. The low-pressure high-flow gas-mixed self-excited pulse double-cavitation jet flow generating device is characterized by comprising a self-excited pulse cavity (1), a conveying gas path pipeline (2) and a jet cylinder (3), wherein the self-excited pulse cavity comprises an oscillation turbulence cavity (11), an inlet end (12) and an outlet end (13), two opposite ends of the oscillation turbulence cavity (11) are provided with a gas inlet and a gas outlet, a liquid inflow hole (4) is formed in one side wall of the oscillation turbulence cavity, the inlet end (12) and the outlet end (13) are respectively connected to the gas inlet and the gas outlet in a sealing mode, and the axial centers of the inlet end and the outlet end are respectively and correspondingly provided with a conveying gas inlet hole and a conveying gas outlet hole;

the conveying gas path pipeline (2) is positioned in the self-excited pulse cavity (1), two ends of the conveying gas path pipeline are respectively and correspondingly communicated with the conveying gas inlet hole and the conveying gas outlet hole, and the outer wall of the conveying gas path pipeline is provided with a collision structure (21) forming a fluid mechanics turbulence phenomenon; the outlet end head (13) is provided with a jet hole (131) communicated with the inner cavity of the oscillating turbulent flow cavity (11) corresponding to the periphery of the conveying air outlet hole; the spray cylinder (3) is provided with a large head end and a small head end, and the large head end of the spray cylinder (3) is connected with the outlet end (13) and is simultaneously communicated with the jet hole (131) and the conveying air outlet hole.

2. The low-pressure high-flow gas-mixing self-excited pulse double-cavitation jet generation device according to claim 1, characterized by further comprising a gas input flow pipeline (5), wherein the gas input flow pipeline (5) is communicated with the gas input hole.

3. The low-pressure high-flow gas-mixing self-excited pulse double-cavitation jet flow generation device as claimed in claim 2, characterized in that the inner wall of the gas input flow pipeline (5) is provided with a gas-material mixing spiral conveying groove, and the inlet of the gas input flow pipeline is provided with a pneumatic valve (6).

4. The low-pressure high-flow gas-mixing self-excited pulse double-cavitation jet flow generation device according to claim 1, characterized in that the inlet end (12) and the outlet end (13) are both in a circular truncated cone shape, the small end of the inlet end is provided with threads which are respectively in threaded connection with two end portions of the corresponding gas conveying pipeline (2), and the large end of the inlet end is respectively in sealed connection with the inner walls of the gas inlet and the gas outlet.

5. The low-pressure high-flow gas-mixing self-excited pulse double cavitation jet generating device according to claim 4, characterized in that the collision structure (21) is a threaded structure.

6. The low-pressure high-flow gas-mixing self-excited pulse double-cavitation jet generation device according to any one of claims 1 to 5, characterized in that the end face of the outlet end (13) close to the ejector (3) is provided with a concave surface.

7. The low-pressure high-flow gas-mixing self-excited pulse double-cavitation-erosion jet generating device as claimed in claim 4, wherein the circular table surfaces of the inlet end (12) and the outlet end (13) are provided with helical structures for enhancing turbulent flow; the inner wall of the liquid inflow hole (4) is provided with a spiral structure for reinforcing turbulent flow, and liquid enters the inner cavity of the oscillating turbulent flow cavity (11) along the tangential direction of the inner wall surface of the oscillating turbulent flow cavity.

8. The low-pressure high-flow gas-mixing self-excited pulse double-cavitation jet generation device according to claim 5, characterized in that the self-excited pulse cavity (1) is cylindrical and has a length of 30-60mm and a diameter of 20-40mm, and an included angle α between the circular table surfaces of the inlet end (12) and the outlet end (13) and the oscillating turbulent flow cavity (11) is less than 60 degrees; the thickness of the inlet end head (12) and the thickness of the outlet end head (13) are 2-10mm, and the diameter of the conveying air inlet hole and the diameter of the conveying air outlet hole are 20-40mm; the thread pitch of the thread structure is 1-1.5mm, and the depth is 15-22.5mm.

9. The low-pressure high-flow gas-mixing self-excited pulse double-cavitation jet flow generation device according to claim 1, characterized in that an air inlet hole (31) is formed in the outer wall of the large head end of the jet cylinder (3).

10. The low-pressure high-flow air-mixing self-excited pulse double-cavitation jet cleaning device is characterized by comprising an operation table bracket, an assistance mechanical arm (100), a vertical rotating device (300), a horizontal rotating device (400), a balancing weight (200) and the low-pressure high-flow air-mixing self-excited pulse double-cavitation jet generating device of any one of claims 1 to 9;

the middle of the power-assisted mechanical arm (100) is connected with the operation platform support in a rotating mode, two ends of the power-assisted mechanical arm are connected with the counterweight block (200) and the vertical rotating device (300) in a relative mode, the vertical rotating device (300) rotates along a vertical plane, the rotating end of the vertical rotating device is connected with the horizontal rotating device (400), and the horizontal rotating device (400) rotates along a horizontal plane, the rotating end of the horizontal rotating device is connected with the low-pressure large-flow air-mixing self-excited pulse double-cavitation jet flow generating device.