A hydraulic cavitation mud reducer with toothed rotating nozzle

Abstract

The present invention discloses a hydraulic cavitation mud reducer with a toothed rotating nozzle, comprising a liquid inlet chamber and a cavitation bubble collapse chamber, and also comprising a cavitation nozzle for connecting the liquid inlet chamber and the cavitation bubble collapse chamber, wherein the cavitation nozzle comprises a first hollow tube and a second hollow tube coaxially arranged along the liquid injection direction, wherein the second hollow tube is rotatably arranged on the first hollow tube, and the outer wall of the second hollow tube is provided with a toothed structure; and further comprising a driving assembly, wherein the output end of the driving assembly is provided with a driving gear, and the driving gear is meshed with the toothed structure for transmission. The present invention can realize efficient cavitation while shredding large block solids and flocs of various lengths, ensuring that the nozzle has a large flow area, increasing the working processing capacity, greatly improving the processing efficiency of the pollutant mixture, reducing the maintenance frequency, and reducing the comprehensive use cost.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cavitation mud reducers, in particular to a hydraulic cavitation mud reducer with a toothed rotating nozzle. Background Art

[0002] At present, the main sludge treatment technologies at home and abroad are: incineration, landfill, anaerobic digestion, aerobic fermentation, thermal drying lime stabilization, sludge pyrolysis, hydrothermal treatment and other methods. All of them belong to the terminal treatment technology for sludge after it is produced. These treatment methods will bring huge equipment investment and high operating costs, and at the same time, they will also cause secondary pollution and ecological safety risks. On average, 80% of the mud cakes in my country are produced every day, about 500,000 tons or more. Due to the high cost of transportation, storage, treatment and disposal of this sludge, and the lack of economical and effective treatment and disposal methods, the amount of this sludge treated by composting, incineration and pyrolysis is less than 5%, and most of it is still naturally stored or scattered in disorder, causing great harm to the environment. Therefore, there is a need for equipment to reduce sludge production, especially in the sewage treatment process, which can reduce sludge production, achieve source reduction, and carry out clean production. It is urgent and necessary.

[0003] In the prior art, such as the new cavitator of China's authorized utility model patent CN200720016011.4, a cavitator is disclosed in which a cavitation induction head and a driving impeller are installed at one end of a orifice plate in a liquid inlet pipe, and the driving impeller is driven to rotate through the liquid inlet pipe, thereby causing the orifice plate to rotate together, generating local high temperature and high pressure and high-speed microjets, and then performing a cavitation effect. However, in reality, the pollutant mixture to be treated is often complex in composition, containing many large solid blocks and flocs of various lengths, etc. Therefore, the above structure has the following shortcomings: the driving impeller of the orifice plate in the liquid inlet pipe is easily blocked by large solid blocks and flocs of various lengths, resulting in high frequency of equipment maintenance, high maintenance costs, and difficulty in long-term industrial application. Summary of the invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a hydraulic cavitation mud reducer with a toothed rotating nozzle, which can achieve efficient cavitation while shredding debris that is prone to clogging, ensure that the nozzle has a larger flow area, increase the working processing capacity, greatly improve the processing efficiency of the pollutant mixture, reduce the maintenance frequency, and reduce the overall use cost.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A hydraulic cavitation mud reducer with a toothed rotating nozzle comprises a liquid inlet chamber and a cavitation bubble collapse chamber, and is characterized in that it also comprises a cavitation nozzle for connecting the liquid inlet chamber and the cavitation bubble collapse chamber, the cavitation nozzle comprises a first hollow tube and a second hollow tube coaxially arranged along a liquid injection direction, the second hollow tube is rotatably arranged on the first hollow tube, and the outer wall of the second hollow tube is provided with a toothed structure; it also comprises a driving assembly, the output end of the driving assembly is provided with a driving gear, and the driving gear is meshed with the toothed structure for transmission; the inner wall of the first hollow tube is provided with a first cavitation inducing structure, and the inner wall of the second hollow tube is provided with a second cavitation inducing structure.

[0007] Preferably, the first cavitation inducing structure comprises a plurality of first protrusions arranged in a circle, radially adjacent first protrusions constitute a first cavitation group, and the first hollow tube is provided with a plurality of first cavitation groups at equal intervals along the axial direction; the second cavitation inducing structure comprises a plurality of second protrusions arranged in a circle, radially adjacent second protrusions constitute a second cavitation group, and the second hollow tube is provided with a plurality of second cavitation groups at equal intervals along the axial direction.

[0008] More preferably, the axial spacing between axially adjacent first cavitation groups is a1, which is 1-3 times the axial length of the first cavitation inducing structure; the axial spacing between axially adjacent second cavitation groups is a2, which is 1-3 times the axial length of the second cavitation inducing structure.

[0009] More preferably, the shape of the first bump may be but is not limited to a rectangle, trapezoid, etc., and the radial height of the first bump is c1, which is 0.1-0.25 times the inner cavity radius of the first hollow tube; the shape of the second bump may be but is not limited to a rectangle, trapezoid, etc., and the radial height of the second bump is c2, which is 0.1-0.25 times the inner cavity radius of the second hollow tube.

[0010] Preferably, the first cavitation inducing structure includes a plurality of first convex strips arranged in a circle, and two ends of the first convex strips extend to two ends of the first hollow tube respectively; the second cavitation inducing structure includes a plurality of second convex strips arranged in a circle, and two ends of the second convex strips extend to two ends of the second hollow tube respectively.

[0011] Preferably, it further comprises an annular groove provided at the end of the first hollow tube, and an annular tube provided at the end of the second hollow tube, wherein the annular groove is rotatably matched with the annular tube.

[0012] Preferably, it also includes a coaxially arranged liquid inlet pipe and a straight-through pipe, and a hollow shell with openings at both ends, the liquid inlet cavity is opened on the liquid inlet pipe, the cavitation bubble collapse cavity is opened on the straight-through pipe, the liquid inlet end of the liquid inlet pipe is fixedly arranged at the left end opening of the hollow shell, the first hollow tube is fixedly arranged at the liquid outlet end of the liquid inlet pipe, the annular tube at the liquid outlet end of the second hollow tube is rotatably matched with the right end opening of the hollow shell, and the straight-through pipe is arranged at the right end of the hollow shell.

[0013] Preferably, the inner diameter of the liquid inlet pipe gradually decreases along the liquid injection direction.

[0014] Preferably, it further comprises a tapered tube and a regulating valve, wherein the tapered tube is coaxially arranged in the cavitation bubble collapse cavity and located at the liquid inlet end of the straight tube, and the regulating valve is arranged at the liquid outlet end of the straight tube.

[0015] Preferably, the inner diameter of the tapered tube gradually increases along the liquid spraying direction.

[0016] Preferably, it also includes an assembly structure, wherein n first hollow tubes are provided, n-1 second hollow tubes are provided, n is an integer greater than or equal to 2, the n first hollow tubes are coaxially connected through the assembly structure, and the second hollow tubes are arranged between adjacent first hollow tubes.

[0017] Preferably, the assembly structure comprises an assembly part and a connecting rod, the assembly part is protruding from the outer wall of the first hollow tube, and adjacent assembly parts are detachably fixed on the connecting rod.

[0018] The beneficial effect of the present invention is that when the sewage enters the liquid, it first passes through the first hollow tube, and the first cavitation induction structures arranged on the inner wall of the first hollow tube are used to perform primary cavitation on the sludge, and then passes through the second hollow tube, and the second cavitation induction structures arranged on the inner wall of the second hollow tube are used to perform secondary cavitation on the sludge, and when the second hollow tube rotates relative to the first hollow tube, the flow cross-sectional area of ​​the sewage changes periodically, thereby generating stronger cavitation and shearing effects, and a larger number of cavitation bubbles can be generated and sheared large solid blocks and flocs of various lengths contained in the muddy water, and finally the cavitation bubbles are broken in the cavitation bubble collapse cavity, thereby breaking the wall and decomposing the sludge cells in the muddy water. Compared with the prior art, the present invention can achieve efficient cavitation while cutting large solid blocks and flocs of various lengths, ensuring that the nozzle has a larger flow area, increasing the working processing capacity, greatly improving the processing efficiency of the pollutant mixed liquid, reducing the maintenance frequency, and reducing the comprehensive use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an axial cross-sectional view of the mud reducer of Example 1 of the present invention;

[0020] Figure 2 An axial cross-sectional view of the cavitation nozzle of Example 1 of the present invention;

[0021] Figure 3 is an axonometric cross-sectional view of the cavitation nozzle of Example 1 of the present invention;

[0022] Figure 4 It is an axial cross-sectional view of the mud reducer of Example 2 of the present invention;

[0023] Figure 5 An axial cross-sectional view of a cavitation nozzle according to Example 2 of the present invention;

[0024] Figure 6 It is an axial cross-sectional view of the cavitation nozzle of Example 2 of the present invention.

[0025] As shown in the figure:

[0026] 1-liquid inlet chamber, 11-liquid inlet pipe;

[0027] 2-cavitation bubble collapse chamber, 21-straight pipe, 22-conical pipe, 23-sealing plate, 24-exit pipe;

[0028] 3-cavitation nozzle, 31-first hollow tube, 311-annular groove, 32-second hollow tube, 321-annular tube, 33-first cavitation inducing structure, 34-second cavitation inducing structure, 35-toothed structure, 36-sealing rubber ring;

[0029] 4-hollow shell, 41-fixed plate;

[0030] 5-assembly structure, 51-assembly part, 52-connecting rod. DETAILED DESCRIPTION

[0031] The following specifically describes the implementation modes of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only for reference and illustration and do not constitute a limitation on the scope of patent protection of the present invention.

[0032] Example 1

[0033] See also Figure 1-Figure 3In this embodiment, a hydraulic cavitation mud reducer with a toothed rotating nozzle includes a liquid inlet chamber 1 and a cavitation bubble collapse chamber 2, and also includes a cavitation nozzle 3 for connecting the liquid inlet chamber 1 and the cavitation bubble collapse chamber 2, the cavitation nozzle 3 includes a first hollow tube 31 and a second hollow tube 32 coaxially arranged along the liquid injection direction, the second hollow tube 32 is rotatably arranged on the first hollow tube 31, and the outer wall of the second hollow tube 32 is provided with a toothed structure 35; it also includes a driving assembly, the output end of the driving assembly is provided with a driving gear, and the driving gear is meshed with the toothed structure 35 for transmission; the inner wall of the first hollow tube 31 is provided with a first cavitation inducing structure 33, and the inner wall of the second hollow tube 32 is provided with a second cavitation inducing structure 34.

[0034] The working principle of this embodiment is as follows: a sludge mixture with a certain flow rate and pressure provided by a non-clogging sewage pump is input into the liquid chamber 11, and the sewage first passes through the first hollow tube 31, and a plurality of first cavitation inducing structures 33 arranged on the inner wall of the first hollow tube 31 are used to perform primary cavitation on the sludge, and then passes through the second hollow tube 32, and a plurality of second cavitation inducing structures 34 arranged on the inner wall of the second hollow tube 32 are used to perform secondary cavitation on the sludge. When the second hollow tube 32 rotates relative to the first hollow tube 31, the flow cross-sectional area of ​​the sewage changes periodically, thereby generating stronger cavitation and shearing effects, which can generate a larger number of cavitation bubbles and shear off large solid blocks and flocs of various lengths contained in the mud water. Finally, the cavitation bubbles are collapsed in the cavitation bubble collapse chamber 2, thereby breaking the wall and decomposing the sludge cells in the mud water. After the sewage mixture is treated by the above high-intensity cavitation, flocs of various lengths become fragmented, and the refractory organic matter is directly decomposed into C02 and H20. The macromolecular chains of refractory organic matter are broken into small molecular chains, and then oxidized into fatty acids, thereby improving the biodegradability of sewage organic matter. At the same time, when cavitation occurs, it is accompanied by a strong shock wave of microjets, and it occurs continuously at tens of thousands of times per second, bringing an efficient mechanical shredding effect and generating free radicals -OH with high chemical activity, which then react with organic pollutants in the solution to oxidize and decompose organic pollutants in the mixed solution into low molecular weight substances. The strong hydraulic shear force generated by the shock wave and high-speed microjets in the mixed solution effectively destroys the sludge structure, breaks the carbon bonds on the main chain of the macromolecule, and transforms them into short-chain low-molecular organic matter, causing the intracellular solutes to flow out and be further decomposed, creating favorable conditions for subsequent biochemical reactions, making the organic matter easier to decompose and reduce through biochemical reactions, thereby achieving a systematic reduction in sludge, and the sludge output can be reduced by more than 40-70%.

[0035] In this embodiment, the toothed structure 35 is a first gear sleeved on the outer wall of the second hollow tube 32, and the driving component (not shown in the figure) is a motor. The driving gear is arranged on the rotating shaft of the motor and meshes with the first gear, thereby realizing the driving of the second hollow tube 32. Compared with the prior art, the aforementioned technical scheme can make the rotation axis of the second hollow tube 32 and the rotating shaft of the motor misaligned, thereby avoiding the situation where the motor rotating shaft and the transmission gear station occupy the internal space of the cavitation nozzle 3 due to coaxial transmission, and further improves the flow space of the cavitation nozzle 3; further preferably, it also includes a bearing, the outer ring of the bearing is fixed on the hollow shell 4, and the inner ring is sleeved on the second hollow tube 32, thereby improving the stability of the second hollow tube 32 during rotation.

[0036] Preferably, the first cavitation inducing structure 33 includes a plurality of first protrusions arranged in a circle, radially adjacent first protrusions form a first cavitation group, and the first hollow tube 31 is provided with a plurality of first cavitation groups at equal intervals along the axial direction; the second cavitation inducing structure 34 includes a plurality of second protrusions arranged in a circle, radially adjacent second protrusions form a second cavitation group, and the second hollow tube 32 is provided with a plurality of second cavitation groups at equal intervals along the axial direction.

[0037] More preferably, the shape of the first protrusion may be but is not limited to a rectangle, a trapezoid, etc., and the radial height of the first protrusion is c1, which is 0.1-0.25 times the inner cavity radius of the first hollow tube 31; the shape of the second protrusion may be but is not limited to a rectangle, a trapezoid, etc., and the radial height of the second protrusion is c2, which is 0.1-0.25 times the inner cavity radius of the second hollow tube 32.

[0038] In this embodiment, the first protrusion is rectangular, and a first arc surface is provided at the outer end of the first protrusion, the first arc surface faces the inner cavity of the first hollow tube, and the outer circumferential arc length of the first arc surface is b1, which is 0.067 times the circumference of the inner cavity of the first hollow tube 31, further improving the shearing effect on large solid objects and flocs of various lengths, and c1 is 0.1 times the inner cavity radius of the first hollow tube 31; the second protrusion is rectangular, and a second arc surface is provided at the outer end of the second protrusion, the second arc surface faces the inner cavity of the second hollow tube 32, and the outer circumferential arc length of the second arc surface is b2, b2 is 0.067 times the inner cavity circumference of the second hollow tube 32, further improving the shearing effect on large solid objects and flocs of various lengths, and c2 is 0.1 times the inner cavity radius of the second hollow tube 32.

[0039] In this embodiment, the first cavitation group includes 6 first protrusions, and the 6 first protrusions are arranged in a circle with equal spacing around the central axis of the first hollow tube 31. There are 2 groups in the first cavitation group, thereby increasing the distribution area of ​​the first protrusions in the first hollow tube 31 and further improving the cavitation efficiency; the second cavitation group includes 6 second protrusions, and the 6 second protrusions are arranged in a circle with equal spacing around the central axis of the second hollow tube 32. There are 3 groups in the second cavitation group, thereby increasing the distribution area of ​​the second protrusions in the second hollow tube 32 and further improving the cavitation efficiency.

[0040] More preferably, the axial spacing between axially adjacent first cavitation groups is a1, which is 1-3 times the axial length of the first cavitation inducing structure 33 ; the axial spacing between axially adjacent second cavitation groups is a2, which is 1-3 times the axial length of the second cavitation inducing structure 34 .

[0041] In this embodiment, a1 is one time the axial length of the first cavitation inducing structure 33 ; a2 is one time the axial length of the second cavitation inducing structure 34 .

[0042] In other alternative embodiments, the first cavitation inducing structure 33 includes a plurality of first convex strips arranged in a circumference, and the two ends of the first convex strips extend to the two ends of the first hollow tube 31 respectively; the second cavitation inducing structure 34 includes a plurality of second convex strips arranged in a circumference, and the two ends of the second convex strips extend to the two ends of the second hollow tube 32 respectively. The cavitation principle of the aforementioned technical solution is the same as that of the technical solution of this embodiment. The process of machining convex strips in the hollow tube is simpler than that of the convex blocks, which can greatly reduce the machining accuracy while maintaining the shearing effect on large solid blocks and flocs of various lengths.

[0043] Preferably, it further comprises an annular groove 311 provided at the end of the first hollow tube 31 , and an annular tube 321 provided at the end of the second hollow tube 32 , and the annular groove 311 and the annular tube 321 are rotatably matched.

[0044] In this embodiment, a sealing rubber ring 36 is also included, and the inner wall of the annular groove 311 is concavely provided with a groove for installing the sealing ring, thereby improving the sealing of the connection between the first hollow tube 31 and the second hollow tube 32; further preferably, two grooves are provided along the radial direction of the annular groove 311, and a sealing rubber ring 36 is respectively provided on the two grooves to further improve the sealing.

[0045] Preferably, it also includes a coaxially arranged liquid inlet pipe 11 and a straight pipe 21, and a hollow shell 4 with openings at both ends, the liquid inlet cavity 1 is opened on the liquid inlet pipe 11, the cavitation bubble collapse cavity 2 is opened on the straight pipe 21, the liquid inlet end of the liquid inlet pipe 11 is fixedly arranged at the left end opening of the hollow shell 4, the first hollow tube 31 is fixedly arranged at the liquid outlet end of the liquid inlet pipe 11, the annular tube 321 of the liquid outlet end of the second hollow tube 32 is rotatably matched with the right end opening of the hollow shell 4, and the straight pipe 21 is arranged at the right end of the hollow shell 4.

[0046] In this embodiment, a fixing plate 41 is further included at the right end of the hollow shell 4, and a through hole is opened on the fixing plate 41. The liquid inlet end and the liquid outlet end of the second hollow tube 32 are respectively provided with annular tubes 321, wherein the annular tube 321 at the liquid inlet end is rotatably matched with the annular groove 311 on the first hollow tube 31, and the annular tube 321 at the liquid outlet end is rotatably matched with the through hole; the liquid inlet end of the liquid inlet pipe 11 of this embodiment is provided with a flanging flange, which is fixed to the liquid inlet end of the hollow shell 4, and preferably a sealing gasket is provided on the flanging flange, and the liquid inlet And improve the sealing performance; the flanging flange, the peripheral wall of the hollow shell 4, and the fixing plate 41 of this embodiment form a cavity, and the cavitation nozzle 3 composed of the first hollow tube 31 and the second hollow tube 32 is located in the aforementioned cavity, wherein the fixing plate 41 is detachably connected to the hollow shell 4, and the aforementioned cavity is displayed by removing the fixing plate 41, so that lubricating liquid can be dripped at the connection between the second hollow tube 32 and the first hollow tube 31, and lubricating liquid can be dripped at the meshing point between the first gear and the second gear, and the cavitation nozzle 3 can be conveniently removed for maintenance.

[0047] Preferably, the inner diameter of the liquid inlet pipe 11 gradually decreases along the liquid injection direction.

[0048] In this embodiment, the sewage is accelerated by using the liquid inlet pipe 11 whose inner diameter gradually decreases along the liquid injection direction, thereby increasing the generation of cavitation bubbles and improving the cavitation effect.

[0049] Preferably, it further comprises a tapered tube 22 and a regulating valve, wherein the tapered tube 22 is coaxially arranged in the cavitation bubble collapse cavity 2 and located at the liquid inlet end of the straight tube 21 , and the regulating valve is arranged at the liquid outlet end of the straight tube 21 .

[0050] In this embodiment, the liquid inlet end of the straight-through pipe 21 is sleeved on the liquid outlet end of the hollow shell 4, and a sealing plate 23 is provided at the liquid outlet end of the straight-through pipe 21. An outlet pipe 24 is provided on the sealing plate 23. A regulating valve (not shown in the figure) is provided on the outlet pipe 24 for adjusting the pressure in the cavitation bubble collapse chamber 2.

[0051] Preferably, the inner diameter of the tapered tube 22 gradually increases along the liquid injection direction. The cavitation bubbles are effectively collapsed in the cavitation bubble collapse chamber 2, breaking the wall and decomposing the sludge cells in the muddy water. Further preferably, the flow area of ​​the minimum diameter of the tapered tube 22 is 2-3 times the maximum flow area of ​​the cavitation nozzle 3, and the flow area of ​​the maximum diameter of the tapered tube 22 is 3-10 times the maximum flow area of ​​the cavitation nozzle 3. In this embodiment, the flow area of ​​the minimum diameter of the tapered tube 22 is 2 times the maximum flow area of ​​the cavitation nozzle 3, and the flow area of ​​the maximum diameter of the tapered tube 22 is 6 times the maximum flow area of ​​the cavitation nozzle 3.

[0052] Example 2

[0053] The difference between this embodiment and embodiment 1 is that:

[0054] Preferably, it also includes an assembly structure 5, wherein n first hollow tubes 31 are provided, n-1 second hollow tubes 32 are provided, and n is an integer greater than or equal to 2, and the n first hollow tubes 31 are coaxially connected through the assembly structure 5, and the second hollow tubes 32 are provided between adjacent first hollow tubes 31.

[0055] See also Figure 4-Figure 6 In this embodiment, n can be but is not limited to 2, 3, 4, 5, 6..., etc. When n=3, there are three first hollow tubes 31, and there are two second hollow tubes 32. The three first hollow tubes 31 are coaxially connected through an assembly structure 5, and the second hollow tubes 32 are arranged between adjacent first hollow tubes 31, thereby achieving the effect of adjusting the length of the cavitation nozzle 3, which is beneficial to broadening the applicable scenarios of the cavitation nozzle 3.

[0056] Preferably, the assembly structure 5 includes an assembly portion 51 and a connecting rod 52 , wherein the assembly portion 52 is protruded from the outer wall of the first hollow tube 31 , and adjacent assembly portions 51 are detachably fixed to the connecting rod 52 .

[0057] In this embodiment, six assembly parts 51 and two connecting rods 52 are included. The assembly parts 51 are arranged opposite to each other on the outside of a single first hollow tube 31. The six assembly parts 51 are respectively provided with threaded holes. The connecting rods 52 are screws. When the threaded holes of the assembly parts 51 on the three first hollow tubes 31 are aligned, the screws 52 are threadedly matched with the three assembly parts 51 to achieve the positioning and fastening of the three first hollow tubes 31, thereby forming an integral cavitation nozzle 3.

[0058] The rest of the contents of this embodiment are the same as those of Embodiment 1 and will not be described in detail here.

[0059] The above disclosure is only a preferred embodiment of the present invention, which cannot be used to limit the scope of protection of the present invention. Therefore, equivalent changes made within the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A hydraulic cavitation mud reducer with a toothed rotating nozzle, comprising a liquid inlet chamber and a cavitation bubble collapse chamber, characterized in that: It also includes a cavitation nozzle for connecting the liquid inlet cavity and the cavitation bubble collapse cavity, the cavitation nozzle includes a first hollow tube and a second hollow tube coaxially arranged along the liquid injection direction, the second hollow tube is rotatably arranged on the first hollow tube, and the outer wall of the second hollow tube is provided with a toothed structure; it also includes a driving assembly, the output end of the driving assembly is provided with a driving gear, and the driving gear is meshed with the toothed structure for transmission; the inner wall of the first hollow tube is provided with a first cavitation inducing structure, and the inner wall of the second hollow tube is provided with a second cavitation inducing structure; It also includes an annular groove provided at the end of the first hollow tube, and an annular tube provided at the end of the second hollow tube, the annular groove and the annular tube are rotatably matched; it also includes a coaxially arranged liquid inlet tube and a straight-through tube, and a hollow shell with openings at both ends, the liquid inlet cavity is provided on the liquid inlet tube, the cavitation bubble collapse cavity is provided on the straight-through tube, the liquid inlet end of the liquid inlet tube is fixedly provided at the left end opening of the hollow shell, the first hollow tube is fixedly provided at the liquid outlet end of the liquid inlet tube, the annular tube at the liquid outlet end of the second hollow tube is rotatably matched with the right end opening of the hollow shell, and the straight-through tube is provided at the right end of the hollow shell; The first cavitation inducing structure includes a plurality of first convex strips arranged in a circumference, and two ends of the first convex strips extend to two ends of the first hollow tube respectively; the second cavitation inducing structure includes a plurality of second convex strips arranged in a circumference, and two ends of the second convex strips extend to two ends of the second hollow tube respectively; Or, the first cavitation inducing structure includes a plurality of first protrusions arranged in a circle, radially adjacent first protrusions form a first cavitation group, and the first hollow tube is provided with a plurality of first cavitation groups at equal intervals along the axial direction; the second cavitation inducing structure includes a plurality of second protrusions arranged in a circle, radially adjacent second protrusions form a second cavitation group, and the second hollow tube is provided with a plurality of second cavitation groups at equal intervals along the axial direction.

2. The hydraulic cavitation mud reducer with toothed rotating nozzle according to claim 1, characterized in that: The inner diameter of the liquid inlet pipe gradually decreases along the liquid injection direction.

3. The hydraulic cavitation mud reducer with toothed rotating nozzle according to claim 1, characterized in that: It also includes a tapered tube and a regulating valve. The tapered tube is coaxially arranged in the cavitation bubble collapse cavity and located at the liquid inlet end of the straight-through tube. The regulating valve is arranged at the liquid outlet end of the straight-through tube.

4. The hydraulic cavitation mud reducer with toothed rotating nozzle according to claim 3, characterized in that: The inner diameter of the tapered tube gradually increases along the liquid spraying direction.

5. The hydraulic cavitation mud reducer with toothed rotating nozzle according to claim 1, characterized in that: It also includes an assembly structure, wherein n first hollow tubes are provided, n-1 second hollow tubes are provided, n is an integer greater than or equal to 2, the n first hollow tubes are coaxially connected through the assembly structure, and the second hollow tubes are provided between adjacent first hollow tubes.

6. The hydraulic cavitation mud reducer with toothed rotating nozzle according to claim 5, characterized in that: The assembly structure comprises an assembly part and a connecting rod. The assembly part is protruding from the outer wall of the first hollow tube, and adjacent assembly parts are detachably fixed on the connecting rod.

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