Cavitation generator and cleaning and oil removing device

Abstract

The utility model discloses a hydrodynamic cavitation generator and a cleaning and oil removing device, and relates to the field of hydrodynamic cavitation devices. A cavitation generator comprises: a vortex chamber comprising a wall surface, an upper top surface and a lower bottom surface; the wall surface included angle A1 between the wall surface and the lower bottom surface is 120-180 degrees; the liquid outlet pipe is located in the center of the vortex cavity and comprises an inner diameter contraction section, an inner diameter expansion section and an inner diameter invariable section in the liquid outlet direction; the plane where the central axis of the liquid inlet pipe is located is parallel to the plane where the central axis of the vortex cavity is located; the liquid inlet pipe comprises a pipe diameter reducing section and a pipe diameter invariable section along the liquid inlet direction; a certain inclined angle is formed between the central axis of the liquid inlet pipe and the central axis of the vortex cavity; the vortex cavity, the liquid inlet pipe and the liquid outlet pipe are of an integrally-formed structure. According to the cavitation generator provided by the utility model, the problems of poor applicability and high cost of the existing cavitation generator are solved, and cavitation generators with different specifications are developed to meet different treatment capacity requirements.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cavitation devices, and more particularly to cavitation generators and their applications. Background Technology

[0002] Hydraulic cavitation generators have been widely used in the environmental protection field for wastewater treatment, organic matter degradation, and sterilization. However, current hydraulic cavitation generators are relatively large and have high manufacturing costs. They are generally made of metal materials and connected by fasteners, resulting in high manufacturing costs and prices. Developing miniaturized cavitation generators has always been a research direction for enterprises and research institutions.

[0003] Most current miniaturized cavitation generators are based on Venturi tubes or orifice plates. Venturi tubes offer advantages such as simple construction, convenient operation, and high economical maintenance. However, under high-intensity cavitation conditions, flow channel blockage is prone to occur in their contraction zone, accompanied by the risk of cavitation damage. Orifice plate generators produce cavitation effects through turbulence within the shear layer, inevitably leading to significant pressure losses as some energy is dissipated within the system. Conventional cavitation generators inevitably cause cavitation damage to the flow path walls during operation, shortening the generator's service life.

[0004] Eddy current diodes generate cavitation through mechanical kinetic energy input or vortex flow field construction. Because the flow channel cross-sectional area does not significantly shrink, they effectively avoid the clogging defects of traditional devices. However, their complex three-dimensional flow field structure significantly increases the manufacturing cost and maintenance difficulty of the equipment, and precise control of cavitation intensity still presents technical challenges. Eddy current diodes, designed based on the eddy current principle, can effectively prevent cavitation bubbles from contacting flow components, thereby delaying and preventing cavitation damage and significantly improving the durability and operational stability of the cavitation generator. However, eddy current diodes still have shortcomings in the fine-tuning of structural parameters and the expansion of applicability. Currently, research on eddy current diodes is still in the research stage in universities and research institutes, and they have not yet been widely applied in actual production.

[0005] Currently, cleaning and degreasing devices on the market generally use heating to break up emulsions and remove oil. Heating is energy-intensive, and it cannot break up the emulsified oil in the liquid, resulting in incomplete removal of impurities in the cleaning solution and making it unusable for recycling. Another method is to use ultrasonic cavitation for cleaning. However, the ultrasonic power is low, resulting in a weak cavitation effect, which is difficult to remove stubborn dirt. Moreover, long-term high-frequency vibration may cause the equipment structure to loosen or the transducer to be damaged. Summary of the Invention

[0006] To meet the needs of cavitation generators in different application scenarios, this utility model provides a cavitation generator that solves the problems of poor applicability and high cost of existing cavitation generators, and develops cavitation generators of different specifications to meet different processing volume requirements.

[0007] Based on the above-mentioned technical problems, the technical solution of this utility model is as follows.

[0008] A cavitation generator, characterized in that it comprises:

[0009] The vortex cavity includes a wall, an upper top surface, and a lower bottom surface; the angle between the wall and the lower bottom surface is the wall angle, and the wall angle A1 = 120~180 degrees;

[0010] The liquid outlet pipe is located at the center of the vortex cavity and, along the liquid outlet direction, includes an inner diameter contraction section, an inner diameter diffusion section, and an inner diameter constant section; the liquid outlet pipe has a liquid outlet pipe inlet;

[0011] The liquid inlet pipe has a central axis in a plane that is parallel to the central axis of the vortex cavity; the liquid inlet pipe includes a section with a decreasing diameter and a section with a constant diameter along the liquid inlet direction.

[0012] The distance between the top surface and the bottom surface of the vortex cavity is the height H of the vortex cavity; the central axis of the liquid inlet pipe is inclined at a certain angle to the central axis of the vortex cavity.

[0013] The vortex cavity, inlet pipe, and outlet pipe are integrally formed.

[0014] Preferably, the height of the vortex cavity H is 10~30mm; the diameter of the upper top surface Dc is 30~50mm; and the tilt angle A2 is 45~90 degrees.

[0015] Preferably, the inner diameter Dt of the outlet pipe inlet is 5~7mm; the inner diameter of the section of the inlet pipe with a constant diameter is the same as the inner diameter of the outlet pipe inlet.

[0016] Preferably, the included angle A3 of the inner diameter contraction section is 4 to 10 degrees, and the included angle A4 of the inner diameter diffusion section is 10 to 15 degrees.

[0017] Preferably, the wall angle A1 = 120 degrees.

[0018] Preferably, the height of the vortex cavity is H=25mm and the tilt angle is A2=45 degrees.

[0019] Preferably, the inner diameter Dt of the outlet pipe inlet is increased by a multiple; the height H of the vortex cavity and the diameter Dc of the upper top surface are increased by the same multiple to change the flow rate of the cavitation generator.

[0020] The purpose of this invention is also to provide a cleaning and degreasing device.

[0021] A cleaning and oil removal device is used to implement the cavitation generator. The cleaning and oil removal device includes a booster pump, a positive pressure gauge is provided between the booster pump and the cavitation generator, the liquid outlet pipe of the cavitation generator is connected to a cleaning tank, and the booster pump is connected to the cleaning tank.

[0022] Preferably, the cleaning tank is equipped with a cover plate with an insertion hole, and the water inlet pipe and water outlet pipe of the cavitation generator are inserted into the cover plate to clean the inside of the cleaning tank.

[0023] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0024] 1. This utility model optimizes the structure of traditional eddy current diodes, improves cavitation efficiency, reduces damage to the generator wall caused by cavitation flow, and explores a method to scale up the size proportionally; the size of the cavitation generator can be scaled up or down according to different flow rates to meet different processing requirements.

[0025] 2. The cleaning and degreasing device uses a cavitation generator to perform hydraulic cavitation treatment on the cleaning tank. The cavitation effect can not only reduce the surface tension of the cleaning liquid, but also generate micro-nano-scale bubbles that can accelerate the collision between the liquid and the oil on the surface of the workpiece, thus enhancing the cleaning ability.

[0026] 3. When the cavitation generator produces a hydraulic cavitation reaction, it also generates a certain amount of heat, which heats the cleaning fluid and increases its surface activation energy, thereby enhancing its cleaning ability and replacing traditional heating methods. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a cavitation generator.

[0028] Figure 2 This is a top view of the cavitation generator.

[0029] Figure 3 This is a cross-sectional view of the cavitation generator AA.

[0030] Figure 4 This is a cross-sectional view of the cavitation generator BB.

[0031] Figure 5 This is another implementation method with a different inclination angle for the inlet pipe.

[0032] Figure 6 This is a system flow diagram of a cleaning and degreasing device.

[0033] Figure 7 This is a diagram showing the slag discharge status of the cleaning tank.

[0034] In the diagram: vortex cavity 1, wall 10, top surface 11, bottom surface 12, liquid outlet pipe 2, inner diameter contraction section 20, inner diameter diffusion section 21, second inner diameter unchanged section 22, inner diameter increasing section 23, liquid inlet pipe 3, pipe diameter decreasing section 30, pipe diameter unchanged section 31, cavitation generator 100, booster pump 200, cleaning water tank 300, water tank cover 301, vent 302, drain pipe 303, valve 3030, pneumatic conveyor 3031, slag discharge channel 304, slag discharge valve 3040, filter screen 305, power unit 3050, power moving rod 3051, connecting rod 3052, slag receiving box 306. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0036] like Figures 1-4 A cavitation generator includes a vortex cavity 1, an outlet pipe 2, and an inlet pipe 3; the inner diameter of the vortex cavity 1 gradually decreases from top to bottom, the upper part of the vortex cavity 1 is a plane, the outlet pipe 2 is located at the center of the upper plane, and the plane containing the central axis of the inlet pipe 3 is parallel to the plane containing the central axis of the outlet pipe 2; Figure 4 The inlet pipe 3 has a variable diameter structure, including a section 30 with a decreasing diameter and a section 31 with a constant diameter along the inlet direction. The central axis of the inlet pipe 3 forms a certain angle with the central axis of the vortex cavity 1. There are at least two inlet pipes 3. The outlet pipe 2 is inserted into the vortex cavity 1. Along the outlet direction, the outlet pipe 2 includes an inner diameter contraction section 20, a throat, an inner diameter diffusion section 21, an inner diameter constant section 22, and an inner diameter increasing section 23. The cavitation generator is a one-piece molded structure, formed by injection molding or 3D printing. Injection molding only incurs mold opening costs, and subsequent mass production is possible. Compared to metal processing, the cost of the cavitation generator is reduced.

[0037] like Figures 3-5 The vortex cavity 1 has a wall 10, an upper top surface 11, and a lower bottom surface 12; the angle between the wall 10 and the lower bottom surface 12 is called the wall angle, A1 = 120~180 degrees; the height of the vortex cavity H = 10~30 mm; the angle between the central axis of the inlet pipe and the central axis of the vortex cavity is an inclination angle, A2 = 45~90 degrees; the diameter Dc of the upper top surface 11 of the vortex cavity is 30~50 mm; the outlet pipe 2 has an outlet pipe inlet, the inner diameter of which is Dt = 5~7 mm; Figure 4 The inner diameter of the constant-diameter section 31 on the inlet pipe 3 is the same as the inner diameter of the inlet of the outlet pipe 2. For example... Figure 3 The included angle A3 of the inner diameter contraction section 20 of the outlet pipe is 4~6 degrees; the included angle A4 of the inner diameter diffusion section 21 is 10~15 degrees.

[0038] like Figure 3The wall angle A1 = 60 degrees, the vortex cavity height H = 25 mm, and the inlet pipe inclination angle A2 = 45 degrees; the diameter Dc of the upper plane of the vortex cavity body is 40 mm, and the included angle A4 of the inner diameter diffuser section 21 is 13 degrees. Using these dimensions as the basic cavitation generator dimensions, the inlet inner diameter Dt of the outlet pipe 2 can be increased proportionally. As the pipe diameter increases by a certain multiple, the flow rate increases by the square of the multiple of the pipe diameter. This can be done by increasing the diameter by 2, 3, or 4 times, with the vortex cavity height H and the upper surface diameter Dc increasing accordingly by the same multiple. This allows for the design of cavitation generators with different flow rates to meet varying processing capacity requirements.

[0039] like Figure 5 The angle A2 between the central axis of the inlet pipe and the central axis of the vortex cavity is 60 degrees.

[0040] like Figure 6 A cleaning and oil removal device using the above-mentioned hydraulic cavitation generator includes a booster pump 200 and a cavitation generator 100. The inlet pipe 3 of the cavitation generator 100 is connected to the booster pump 200. A positive pressure gauge is connected between the booster pump 200 and the cavitation generator 100. The outlet pipe 2 of the cavitation generator is connected to a cleaning tank 300.

[0041] like Figure 6 The cleaning tank 300 also includes a cover plate 301. The water outlet pipe of the cavitation generator 100 passes through the cover plate 301 and inserts into the cleaning tank 300. The water inlet pipe of the cavitation generator 100 also passes through the cover plate 301 and inserts into the cleaning tank 300.

[0042] The hydraulic cavitation generator 100 and the booster pump 200 can be used as an independent module and adapted to the existing cleaning tank 300. An insertion hole is provided on the cover plate 301, and the water inlet and outlet pipes of the cavitation generator can be inserted into the cover plate for cleaning. Different sizes and specifications of cavitation generators can be selected according to different tank capacities. The modification to the existing cleaning tank is minimal.

[0043] The bottom of the cleaning tank 300 is sloping. At the lowest point of the sloping bottom, there is a drain port 302. Below the drain port 302, there is a slag discharge channel 304. A drain pipe 303 is installed on the side wall of the slag discharge channel 304, and a valve is installed on the drain pipe 303. A slag discharge valve is installed below the slag discharge channel 304. The drain port 302 is square. A filter screen plate 305 is installed inside the drain port 302. The filter screen plate 305 is square in structure. A sealing element is installed between the filter screen plate and the drain port 302. A hinge is installed between the filter screen plate 305 and the bottom of the cleaning tank 300. A power source 3050 is also installed on the side wall of the slag discharge channel. The power source 3050 is a cylinder. The power source includes a power rod 3051. An ear plate is installed below the screen plate. A connecting rod 3052 is movably connected between the power rod 3051 and the ear plate. The extension and retraction of the power rod 3051 drives the connecting rod 3052 to rotate, causing the filter screen 305 to rotate around the hinge to open or close.

[0044] The working principle of a cleaning and degreasing device:

[0045] like Figure 6 The workpiece to be cleaned is placed in the cleaning tank 300. Tap water can be introduced from the outside to fill the cleaning tank 300. Depending on the workpiece to be cleaned, cleaning agent can be added to the cleaning tank or not. The slag discharge valve 3040 and the drain pipe 3030 are closed. The inlet and outlet pipes of the cavitation generator 100 are inserted into the cleaning tank 300 through the cover plate 301 to clean the oily workpiece inside the cleaning tank.

[0046] The liquid in the cleaning tank 300 enters the cavitation generator 100 through the inclined inlet pipe 3. The liquid vortex rotates and flows downward, passing sequentially through the inner diameter contraction section, throat, and inner diameter diffusion section of the outlet pipe 2. Micro-nano-scale bubbles are generated in the throat. The generation, growth, and bursting of these bubbles bring about a hydraulic cavitation effect, which enhances the turbulence and mass exchange in the liquid. At the same time, the hydraulic cavitation effect can also reduce the surface tension of the cleaning liquid, greatly increasing the cleaning capacity.

[0047] like Figure 7 After the oil stains on the surface of the oily workpiece are cleaned, valve 3030 on the drain pipe is opened, and the cleaning wastewater is discharged through drain pipe 303. At the same time, filter screen 305 intercepts particulate matter. A vacuum pump or pneumatic conveyor 3031 can also be connected to drain pipe 303 to pump out the water. Then, slag discharge valve 3040 is opened, and power 3050 is started to open filter screen 305. The filter residue trapped on filter screen 305 is poured out and falls into slag collection box 306. After being filtered by the filter screen, the cleaning liquid discharged from drain pipe 303 can be used for pre-cleaning of workpieces, reducing the amount of waste liquid discharged; or it can be discharged directly through the drain pipe. Because the particulate matter content in the cleaning liquid is reduced after being intercepted by the filter screen, the pressure on subsequent wastewater treatment is reduced.

[0048] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A cavitation generator, characterized in that, include: The vortex cavity includes a wall, an upper top surface, and a lower bottom surface; the angle between the wall and the lower bottom surface is the wall angle, and the wall angle A1 = 120~180 degrees; The liquid outlet pipe is located at the center of the vortex cavity and, along the liquid outlet direction, includes an inner diameter contraction section, an inner diameter diffusion section, and an inner diameter constant section; the liquid outlet pipe has a liquid outlet pipe inlet; The liquid inlet pipe has a central axis in a plane that is parallel to the central axis of the vortex cavity; the liquid inlet pipe includes a section with a decreasing diameter and a section with a constant diameter along the liquid inlet direction. The distance between the top surface and the bottom surface of the vortex cavity is the height H of the vortex cavity; the central axis of the liquid inlet pipe is inclined at a certain angle to the central axis of the vortex cavity. The vortex cavity, inlet pipe, and outlet pipe are integrally formed.

2. The cavitation generator according to claim 1, characterized in that, The height of the vortex cavity H = 10~30mm; the diameter of the upper top surface Dc = 30~50mm; the tilt angle A2 = 45~90 degrees.

3. A cavitation generator according to claim 1, characterized in that, The inner diameter Dt of the outlet pipe inlet is 5~7mm; the inner diameter of the section of the inlet pipe with a constant diameter is the same as the inner diameter of the outlet pipe inlet.

4. A cavitation generator according to claim 1, characterized in that, The included angle A3 of the inner diameter contraction section is 4 to 10 degrees, and the included angle A4 of the inner diameter diffusion section is 10 to 15 degrees.

5. A cavitation generator according to claim 1, characterized in that, The wall angle A1 = 120 degrees.

6. A cavitation generator according to claim 2, characterized in that, The height of the vortex cavity is H=25mm, and the tilt angle is A2=45 degrees.

7. A cavitation generator according to claim 1, characterized in that, The inner diameter Dt of the outlet pipe inlet is increased by a multiple; the height H of the vortex cavity and the diameter Dc of the upper top surface are increased by the same multiple to change the flow rate of the cavitation generator.

8. A cleaning and degreasing device, characterized in that, For implementing the cavitation generator according to any one of claims 1 to 7, the cleaning and oil removal device includes a booster pump, a positive pressure gauge is provided between the booster pump and the cavitation generator, the liquid outlet pipe of the cavitation generator is connected to a cleaning tank, and the booster pump is connected to the cleaning tank.

9. A cleaning and degreasing device according to claim 8, characterized in that, The cleaning tank is equipped with a cover plate with an insertion hole. The inlet and outlet pipes of the cavitation generator are inserted into the cover plate to clean the inside of the cleaning tank.

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