A strong shear type annular jet cavitation generation and monitoring device

Abstract

The present invention discloses a strong shear type annular jet cavitation generation and monitoring device, which belongs to the field of cavitation generators, including a rectifier tube, one end of which is penetrated by an outlet tube, and the other end of which is detachably connected to a reflux assembly, the inside of which is sequentially provided with a straight-through section, a contraction section and a back pressure section from one side to the other, and the inner wall of the contraction section and the outer periphery of the outlet tube form a tapered annular cavity, the reflux assembly specifically includes: a reflux seat, and one end of the reflux seat is fixedly connected to a threaded seat, the side center of the reflux seat is fixedly connected to a plug rod, and the plug rod is inserted into the back pressure section and matched with it, the other end of the rectifier tube is provided with a threaded interface, the threaded seat is screwed into the threaded interface and can be detached, and the end of the plug rod away from the reflux seat is provided with a circular groove. The present invention continuously adjusts the back jet to change it, thereby causing a strong change in the stress state of the fluid, thereby achieving a better cavitation effect.

Description

Technical Field

[0001] The invention relates to a cavitation generator, in particular to a strong shearing type annular jet cavitation generating and monitoring device. Background Art

[0002] Cavitation is the process of formation, development and collapse of vapor or gas bubbles inside the liquid or on the liquid-solid interface when the local pressure inside the liquid is reduced to the saturated vapor pressure of the liquid. For a long time, people have been committed to preventing the occurrence of cavitation and reducing the harm of cavitation. However, the local high temperature, high pressure, strong shock waves, high-speed microjets, etc. generated by the process of cavitation bubbles from inception, development to collapse in cavitation flow can be effectively applied to environmental protection engineering, bioengineering and food industry, such as sewage treatment, sterilization and disinfection, and emulsification processing.

[0003] The strong shear cavitation generator is the most widely used cavitation generating equipment. It is mainly based on the strong shear that causes the stress state of the fluid to change, causing cavitation to occur at defects inside the fluid or at the interface. Usually, when in use, it is necessary to construct a reflow area so that the return jet meets the high-speed jet to produce a strong shear effect, resulting in high-intensity cavitation.

[0004] The prior art has the following problems: the unchanged back jet flow easily leads to a weak change in the stress state of the fluid, which makes the cavitation effect not better. Therefore, those skilled in the art provide a strong shear type annular jet cavitation generation and monitoring device to solve the problems raised in the above background technology. Summary of the invention

[0005] The purpose of the present invention is to provide a strong shear type annular jet cavitation generation and monitoring device, which continuously adjusts the back jet to change it, thereby causing a strong change in the stress state of the fluid, thereby achieving better cavitation effect, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A strong shear type annular jet cavitation generation and monitoring device comprises a rectifier tube, one end of which is penetrated by an outlet tube, and the other end of which is detachably connected to a reflux assembly, a straight-through section, a contraction section and a back pressure section are sequentially provided inside the rectifier tube from one side to the other side, and a tapered annular cavity is formed between the inner wall of the contraction section and the periphery of the outlet tube.

[0008] As a further solution of the present invention: the reflux assembly specifically includes: a reflux seat, and a threaded seat is fixedly connected to one end of the reflux seat, a plug rod is fixedly connected to the side center of the reflux seat, and the plug rod is inserted into the back pressure section and matches it, a threaded interface is provided at the other end of the rectifier tube, and the threaded seat is screwed into the threaded interface and can be removably disposed, a circular groove is provided at the end of the plug rod away from the reflux seat, and a partition is fixedly connected to the middle position of the inner wall of the circular groove, the partition divides the circular groove into two symmetrical arc grooves, and a convex-concave elastic membrane is fixedly connected to the inner wall of the arc groove, a convex head matching it is movably connected in the arc groove on one side of the convex-concave elastic membrane, and a driving mechanism is provided on one side of the convex head for driving the convex head to move, and the two convex heads are staggered from each other when one moves forward and the other moves backward.

[0009] As a further solution of the present invention: the driving mechanism specifically includes: a driving rod and a driving block, one end of the driving rod is fixedly connected to the protruding head, and the other end of the driving rod passes through the threaded seat and the plug rod and extends to a driving cavity opened inside the reflux seat, the driving block is located inside the driving cavity and fixedly connected to the other end of the driving rod, and a power piece is provided under the driving block to drive the driving block to move.

[0010] As a further solution of the present invention: the power part specifically includes: a rotating disk located below the driving block, the outer side surface of the rotating disk is fixedly connected to three evenly distributed rotating arms, and one end of the rotating arm is rotatably connected to a roller, the bottom end surface of the driving block is provided with a step, a driving motor is embedded on the inner wall of the driving cavity, and the output shaft of the driving motor is fixedly connected to the center of the side surface of the rotating disk.

[0011] As a further solution of the present invention: a plurality of evenly distributed particle protrusions are fixedly connected to the outer surface of the concavoconvex elastic membrane.

[0012] As a further solution of the present invention: a sealing disk is fixedly connected to one end of the rectifier tube, and a fastening ring is fixedly connected to the center of the side of the sealing disk, one end of the outlet pipe passes through the fastening ring and the sealing disk and extends to the inside of the rectifier tube, and the outer side of the fastening ring is threadedly connected with at least three fastening bolts to fix the position of the outlet pipe.

[0013] As a further solution of the present invention: a sealing ring is embedded between the inside of the sealing disk and the outer wall of the outlet pipe.

[0014] As a further solution of the present invention: it also includes a plurality of ultrasonic transducers, which are fixed in sequence along the length direction of the outlet pipe, and the transmitting end and the receiving end of the ultrasonic transducer are correspondingly installed on the peripheral side of the outlet pipe.

[0015] As a further solution of the present invention: it also includes a high-pressure water supply pipe, and the high-pressure water supply pipe is vertically connected to the rectifier tube.

[0016] As a further solution of the present invention: the outer diameter of the outlet pipe is smaller than the inner diameter of the rectifier pipe.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present application sets a reflux component and two alternating concave-convex elastic membranes on the impact surface, which can continuously adjust the return jet to change it, thereby causing a strong change in the stress state of the fluid, thereby achieving a better cavitation effect.

[0019] 2. The driving mechanism set up in the present application can intermittently push the driving rod forward, thereby driving the convex head forward to form a convex elastic membrane. When the driving mechanism does not push the driving rod forward, the high-speed jet will impact the elastic membrane into a concave shape. The two are cyclically alternating, effectively achieving the purpose of continuously alternating changes in the impact surface.

[0020] 3. The particle protrusions provided in the present application can change the direction of the reflected back jet at various angles when receiving the impact of the high-speed jet, thereby better changing the back jet.

[0021] 4. The present application provides a fastening ring and fastening bolts to adjust the length of the outlet pipe extending into the interior of the rectifier pipe, thereby adjusting the length of the tapered annular cavity, thereby achieving regulation of the flow rate of the high-speed jet when it is ejected from the tapered annular cavity.

[0022] 5. When installing the reflux assembly, the staff only needs to insert the plug rod into the back pressure section and then screw the threaded seat into the threaded interface. This installation method is not only convenient for installation and disassembly, but also can adjust the length of the plug rod inserted into the back pressure section by adjusting the depth of the threaded seat screwed into the threaded interface, thereby adjusting the distance between the back pressure section port and the plug rod end (that is, the actual working length of the back pressure section). The longer the actual working length, the smaller the back pressure, and the staff can adjust the plug rod insertion depth as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a strong shear type annular jet cavitation generation and monitoring device;

[0024] Figure 2 It is a structural schematic diagram of a reflux component in a strong shear type annular jet cavitation generation and monitoring device;

[0025] Figure 3 A strong shear type annular jet cavitation generation and monitoring device Figure 2 A magnified view of middle;

[0026] Figure 4 A strong shear type annular jet cavitation generation and monitoring device Figure 2Enlarged view of middle B;

[0027] Figure 5 A combined view of a circular groove and a partition in a strong shear type annular jet cavitation generation and monitoring device;

[0028] Figure 6 It is a combined view of two convex heads in a strong shear type annular jet cavitation generation and monitoring device;

[0029] Figure 7 It is a combined view of a fastening ring and a fastening bolt in a strong shear type annular jet cavitation generation and monitoring device;

[0030] Figure 8 This is a combined view of an outlet pipe and an ultrasonic transducer in a strong shear type annular jet cavitation generation and monitoring device.

[0031] In the figure: 1. rectifier tube; 2. reflux seat; 3. straight-through section; 4. contraction section; 5. back pressure section; 6. sealing disk; 7. fastening ring; 8. outlet pipe; 9. ultrasonic transducer; 901. transmitting end; 902. receiving end; 10. sealing ring; 11. high-pressure water supply pipe; 12. threaded interface; 13. threaded seat; 14. plug rod; 15. driving cavity; 16. driving rod; 17. convex head; 18. circular groove; 19. convex and concave elastic membrane; 20. driving motor; 21. rotating disk; 22. rotating arm; 23. roller; 24. driving block; 25. step; 26. fastening bolt; 27. partition; 28. particle protrusion. DETAILED DESCRIPTION

[0032] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] See also Figures 1 to 8 In an embodiment of the present invention, a strong shear type annular jet cavitation generation and monitoring device includes a rectifier tube 1, one end of which is penetrated by an outlet pipe 8, and the other end of the rectifier tube 1 is detachably connected to a return assembly, and the interior of the rectifier tube 1 is sequentially provided with a straight section 3, a contraction section 4 and a back pressure section 5 from one side to the other, and the inner wall of the contraction section 4 and the outer periphery of the outlet pipe 8 form a tapered annular cavity. The present application can continuously adjust the return jet to change it by setting a detachable return assembly, thereby causing a strong change in the stress state of the fluid, thereby achieving a better cavitation effect.

[0034] In this embodiment: the reflux assembly specifically includes: a reflux seat 2, and a threaded seat 13 is fixedly connected to one end of the reflux seat 2, a plug rod 14 is fixedly connected to the center of the side of the reflux seat 2, and the plug rod 14 is inserted into the back pressure section 5 and matched with it, a threaded interface 12 is provided at the other end of the rectifier tube 1, and the threaded seat 13 is screwed into the threaded interface 12 and can be detached, a circular groove 18 is provided at the end of the plug rod 14 away from the reflux seat 2, and a partition 27 is fixedly connected to the middle position of the inner wall of the circular groove 18, the partition 27 divides the circular groove 18 into two symmetrical arc grooves, and a concave-convex elastic membrane 19 is fixedly connected to the inner wall of the arc groove, a convex head 17 matching with it is movably connected in the arc groove on one side of the concave-convex elastic membrane 19, and a driving mechanism is provided on one side of the convex head 17 for driving the convex head 17 to move, and the two convex heads 17 move when one moves forward and the other moves backward, and the two are staggered with each other. The two driving convex heads 17 move one after the other. When one driving convex head 17 moves forward, it pushes up the corresponding concave-convex elastic membrane 19 along the corresponding arc groove to form a convex shape. At this time, the other driving convex head 17 cannot reach the concave-convex elastic membrane 19 because it has not moved forward. The high-speed jet punches its corresponding concave-convex elastic membrane 19 into a concave shape. The convex concave-convex elastic membrane 19 and the concave concave-convex elastic membrane 19 alternate continuously. After the high-speed jet hits the concave-convex elastic membrane 19, a back jet is generated. Since the impact surface keeps alternating, the back jet is also changing continuously, which leads to a strong change in the stress state of the fluid, thereby making the cavitation effect better.

[0035] In this embodiment: the driving mechanism specifically includes: a driving rod 16 and a driving block 24, one end of the driving rod 16 is fixedly connected to the convex head 17, and the other end of the driving rod 16 penetrates the threaded seat 13 and the plug rod 14 and extends to the driving cavity 15 opened inside the reflux seat 2, the driving block 24 is located inside the driving cavity 15 and is fixedly connected to the other end of the driving rod 16, and a power piece is provided below the driving block 24 to drive the driving block 24 to move. The driving mechanism can intermittently push the driving rod 16 forward, thereby driving the convex head 17 forward to form a convex elastic membrane 19, and when the driving mechanism does not push the driving rod 16 forward, the high-speed jet will impact the elastic membrane 19 into a concave shape, and the two are cyclically alternating, effectively achieving the purpose of continuously alternating the impact surface.

[0036] In this embodiment, the power member specifically includes: a rotating disk 21 located below the driving block 24, three evenly distributed rotating arms 22 are fixedly connected to the outer side of the rotating disk 21, and one end of the rotating arm 22 is rotatably connected to a roller 23, a step 25 is provided on the bottom end surface of the driving block 24, a driving motor 20 is embedded on the inner wall of the driving cavity 15, and the output shaft of the driving motor 20 is fixedly connected to the center of the side of the rotating disk 21. The setting of the power member can achieve the purpose of intermittently pushing the driving rod 16 forward.

[0037] In this embodiment, a plurality of evenly distributed particle protrusions 28 are fixedly connected to the outer surface of the concavoconvex elastic membrane 19. The particle protrusions 28 can change the direction of the reflected back jet flow at various angles when receiving the impact of the high-speed jet flow, thereby better changing the back jet flow.

[0038] In this embodiment: a sealing disk 6 is fixedly connected to one end of the rectifier tube 1, and a fastening ring 7 is fixedly connected to the center of the side of the sealing disk 6, one end of the outlet pipe 8 passes through the fastening ring 7 and the sealing disk 6 and extends to the inside of the rectifier tube 1, and at least three fastening bolts 26 are threadedly connected to the outer side of the fastening ring 7 to fix the position of the outlet pipe 8. In this arrangement, the length of the outlet pipe 8 extending into the inside of the rectifier tube 1 can be adjusted, thereby adjusting the length of the tapered annular cavity.

[0039] In this embodiment, a sealing ring 10 is embedded between the inside of the sealing disc 6 and the outer wall of the outlet pipe 8. This arrangement improves the sealing performance between the sealing disc 6 and the outlet pipe 8.

[0040] In this embodiment, a plurality of ultrasonic transducers 9 are also included, and the plurality of ultrasonic transducers 9 are sequentially fixed along the length direction of the outlet flow pipe 8, and the transmitting end 901 and the receiving end 902 of the ultrasonic transducer 9 are correspondingly installed on the peripheral side of the outlet flow pipe 8. The ultrasonic transducer 9 is connected to an external cavitation monitoring device, and can monitor the cavitation process in real time. The external cavitation monitoring device includes an amplifier, an A / D converter, a microprocessor, and an output unit.

[0041] In this embodiment, a high-pressure water supply pipe 11 is further included, and the high-pressure water supply pipe 11 is vertically connected to the rectifying pipe 1. The high-pressure water supply pipe 11 is used to send a high-speed jet into the rectifying pipe 1.

[0042] In this embodiment, the outer diameter of the outlet pipe 8 is smaller than the inner diameter of the rectifying pipe 1. This arrangement ensures that there is a gap between the outlet pipe 8 and the rectifying pipe 1 to form an annular flow channel.

[0043] The working principle of the present invention is: when in use, a high-speed jet is fed into the interior of the rectifier tube 1 through the high-pressure water supply pipe 11, and the high-speed jet enters the straight-through section 3 of the rectifier tube 1, and enters the contraction section 4 from the annular flow channel between the outlet pipe 8 and the rectifier tube 1, and the inner wall of the contraction section 4 and the outer periphery of the outlet pipe 8 form a tapered annular cavity. As the flow channel cross section of the tapered annular cavity gradually decreases, the flow velocity of the high-speed jet flowing through the tapered annular cavity is further increased, and then the high-speed jet is ejected at high speed into the cavitation chamber, i.e., the space between the outlet pipe 8 and the back pressure section 5 in the contraction section 4. Due to the obstruction of the reflux component in the back pressure section 5, the working fluid cannot continue to flow downstream, and the fluid will flow upstream in the reverse direction. The reverse back jet will meet the high-speed jet ejected from the tapered annular cavity in the cavitation chamber, forming a strong shearing effect. The vortex structure in the shear layer, especially the turbulent coherent structure with vortex accumulation and turbulent pressure pulsation in the shear layer, makes the local minimum pressure at the center of the vortex core in the flow field far reach the saturated vapor pressure. After the cavitation core enters the shear layer, it encounters a lower vortex center low pressure and quickly grows into a bubble, resulting in high-intensity cavitation. It should be noted that, during the cavitation process, the two driving protrusions 17 move one after the other through the driving mechanism. When one driving protrusion 17 moves forward, the driving protrusion 17 pushes up the corresponding concave-convex elastic membrane 19 along the corresponding arc groove to form a convex shape. At this time, the other driving protrusion 17 cannot reach the concave-convex elastic membrane 19 because it has not moved forward. The high-speed jet punches its corresponding concave-convex elastic membrane 19 into a concave shape. The convex concave-convex elastic membrane 19 and the concave concave-convex elastic membrane 19 alternate continuously, and the high-speed jet hits the concave-convex elastic membrane 19 to generate a back jet. Since the impact surface keeps alternating, the back jet also changes continuously, which leads to a strong change in the stress state of the fluid, thereby making the cavitation effect better. The working principle of the driving mechanism is that the driving motor 20 drives the rotating disk 21 to rotate, and then drives the rotating arm 22 on the rotating disk 21 to rotate, and the roller 23 on the rotating arm 22 hits the step 25 of the driving block 24, pushing the driving block 24 forward, and then drives the driving protrusion 17 and the driving rod 16 forward. In addition, when the cavitated fluid flows out through the outlet pipe 8, the receiving end 902 of the ultrasonic transducer 9 receives the ultrasonic signal from the transmitting end 901 and converts the received ultrasonic signal into an acoustic wave analog signal, the amplifier receives and amplifies the acoustic wave analog signal, the A / D converter converts the amplified primary analog signal into an acoustic wave digital signal, the microprocessor receives and judges the acoustic wave digital signal from the A / D converter, and outputs a corresponding feedback signal, the output unit is controlled by the microprocessor, and displays the received feedback signal, so as to achieve the effect of real-time monitoring of the cavitation process, and the output unit can be a display or a map printer or any other device that can realize information output.In addition, the staff can also adjust the length of the outlet pipe 8 extending into the rectifier tube 1 as needed, and then adjust the length of the tapered annular cavity, so as to adjust the flow velocity of the high-speed jet when it is ejected from the tapered annular cavity. The specific adjustment process is to loosen the fastening bolt 26 to loosen the outlet pipe 8, pull the outlet pipe 8 to adjust it to the appropriate length of the extension, and then tighten the fastening bolt 26. When installing the reflux assembly, the staff only needs to insert the plug rod 14 into the back pressure section 5, and then screw the threaded seat 13 into the threaded interface 12. This installation method is not only convenient for installation and disassembly, but also can adjust the length of the plug rod 14 inserted into the back pressure section 5 by adjusting the depth of the threaded seat 13 screwed into the threaded interface 12, and then adjust the distance between the port of the back pressure section 5 and the end of the plug rod 14 (that is, the actual working length of the back pressure section 5). The longer the actual working length, the smaller the back pressure. The staff can adjust the insertion depth of the plug rod 14 as needed.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0045] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A strong shear type annular jet cavitation generation and monitoring device, characterized in that: The invention comprises a rectifier tube (1), one end of which is penetrated by an outlet tube (8), and the other end of which is detachably connected to a return assembly, the interior of the rectifier tube (1) is provided with a straight-through section (3), a contraction section (4) and a back pressure section (5) in sequence from one side to the other side, and the inner wall of the contraction section (4) and the outer periphery of the outlet tube (8) form a gradually contracting annular cavity; The reflux assembly specifically comprises: a reflux seat (2), one end of which is fixedly connected to a threaded seat (13), a plug rod (14) is fixedly connected to the center of the side of the reflux seat (2), and the plug rod (14) is inserted into the back pressure section (5) and matches therewith, the other end of the rectifier tube (1) is provided with a threaded interface (12), the threaded seat (13) is screwed into the threaded interface (12) and can be detached, and a circular groove (18) is provided at one end of the plug rod (14) away from the reflux seat (2), and A partition plate (27) is fixedly connected to the middle position of the inner wall of the circular groove (18), and the partition plate (27) divides the circular groove (18) into two symmetrical arc grooves. A concave-convex elastic membrane (19) is fixedly connected to the inner wall of the arc groove. A convex head (17) matching with the concave-convex elastic membrane (19) is movably connected in the arc groove on one side of the concave-convex elastic membrane (19), and a driving mechanism is provided on one side of the convex head (17) for driving the convex head (17) to move. When one of the two convex heads (17) moves forward, the other moves backward, and the two convex heads (17) are staggered with each other. The driving mechanism specifically comprises: a driving rod (16) and a driving block (24); one end of the driving rod (16) is fixedly connected to the protruding head (17); the other end of the driving rod (16) penetrates the threaded seat (13) and the plug rod (14) and extends into a driving cavity (15) provided inside the reflux seat (2); the driving block (24) is located inside the driving cavity (15) and fixedly connected to the other end of the driving rod (16); and a power member is provided below the driving block (24) for driving the driving block (24) to move.

2. A strong shear type annular jet cavitation generation and monitoring device according to claim 1, characterized in that: The power component specifically comprises: a rotating disk (21) located below a driving block (24); three evenly distributed rotating arms (22) are fixedly connected to the outer side surface of the rotating disk (21); one end of the rotating arm (22) is rotatably connected to a roller (23); a step (25) is provided on the bottom end surface of the driving block (24); a driving motor (20) is embedded on the inner wall of the driving cavity (15); and the output shaft of the driving motor (20) is fixedly connected to the center of the side surface of the rotating disk (21).

3. A strong shear type annular jet cavitation generation and monitoring device according to claim 1, characterized in that: A plurality of evenly distributed particle protrusions (28) are fixedly connected to the outer surface of the concavoconvex elastic film (19).

4. The strong shear type annular jet cavitation generation and monitoring device according to claim 1 is characterized in that: One end of the rectifier tube (1) is fixedly connected to a sealing disk (6), and a fastening ring (7) is fixedly connected to the center of the side of the sealing disk (6); one end of the outlet tube (8) passes through the fastening ring (7) and the sealing disk (6) and extends to the inside of the rectifier tube (1), and at least three fastening bolts (26) are threadedly connected to the outer side of the fastening ring (7) to fix the position of the outlet tube (8).

5. A strong shear type annular jet cavitation generation and monitoring device according to claim 4, characterized in that: A sealing ring (10) is embedded between the interior of the sealing disk (6) and the outer wall of the outlet pipe (8).

6. The strong shear type annular jet cavitation generation and monitoring device according to claim 1 is characterized in that: It also comprises a plurality of ultrasonic transducers (9), which are fixed in sequence along the length direction of the outlet pipe (8), and the transmitting end (901) and the receiving end (902) of the ultrasonic transducer (9) are correspondingly mounted on the peripheral side of the outlet pipe (8).

7. The strong shear type annular jet cavitation generation and monitoring device according to claim 1 is characterized in that: It also comprises a high-pressure water supply pipe (11), wherein the high-pressure water supply pipe (11) is vertically connected to the rectifier tube (1).

8. The strong shear type annular jet cavitation generation and monitoring device according to claim 1 is characterized in that: The outer diameter of the outlet pipe (8) is smaller than the inner diameter of the rectifier pipe (1).

Images