Two-stage series integrated nested classification hydrocyclone

Abstract

The invention belongs to the technical field of hydrocyclones, and discloses a two-stage series integrated nested classification hydrocyclone which comprises a first-stage cylinder, the top end of the first-stage cylinder is connected with a top cover, and the top cover of the first-stage cylinder is connected with an overflow pipe; the bottom end of the first-stage cylinder is connected with an inverted outer circular truncated cone cylinder, an upright inner circular truncated cone cylinder is arranged in the outer circular truncated cone cylinder in a sleeved mode, and the bottom end of the outer circular truncated cone cylinder and the bottom end of the inner circular truncated cone cylinder are connected in a sealed mode through an annular groove. A second-stage cylinder is arranged in the first-stage cylinder in a sleeving manner, one end of the second-stage cylinder is connected with the top cover, the other end of the second-stage cylinder is connected with a second-stage circular truncated cone cylinder, the second-stage circular truncated cone cylinder is arranged in the inner circular truncated cone cylinder in a penetrating manner, and the second-stage cylinder is connected with the inner circular truncated cone cylinder; a spiral guide plate is connected in the second-stage cylinder, and a plurality of spiral inlets are formed in the side wall of the second-stage cylinder; the invention solves the problems that the underflow is fine during the grading operation of the cyclone, the grading precision of the single cyclone is insufficient, and the energy loss of the intermediate pipeline of the series cyclone is too much.

Description

Technical Field

[0001] The invention relates to the technical field of hydrocyclones, in particular to a two-stage series-connected integrated nested graded hydrocyclone. Background Art

[0002] Hydrocyclone is a multiphase flow separation equipment. The separation working principle is to use the different densities of each phase of the material, resulting in different centrifugal forces during the cyclone process, to achieve the separation of different phases. It is widely used in mining, environmental protection, food, chemical and other industries. The hydrocyclone is generally composed of a hollow cylinder at the top and an inverted cone connected to the cylinder at the bottom, which together form the working cylinder of the hydrocyclone. The hydrocyclone uses a sand pump to rotate the slurry into the cylinder along the tangential direction at a certain pressure and flow rate, and then the slurry rotates along the cylinder wall at a very fast speed to generate centrifugal force. Under the action of centrifugal force and gravity, the coarse sand in the slurry is subjected to a large centrifugal force and enters the outflow, sinks along the cyclone wall, and is discharged from the sand settling port, while the fine particles and most of the water in the slurry rise in the form of inflow and are discharged as overflow through the overflow pipe, thereby completing the classification operation.

[0003] However, during the classification process, problems such as underflow containing fine particles and overflowing coarse particles are often encountered, which affect the classification performance. Therefore, multiple hydrocyclones are currently connected in series through pipelines on the market. Although this is helpful in solving the problem of too few screening stages, this traditional method of connecting hydrocyclones in series takes up more space, and the two-stage series cyclones need to be connected by pipelines, which produces excess flow energy loss and increases energy loss. Summary of the invention

[0004] The present invention aims to provide a two-stage series-connected integrated nested grading hydrocyclone, which solves the problems of underflow clamping during cyclone grading operation, insufficient grading accuracy of single cyclone, and excessive energy loss in the middle pipeline of the series cyclone.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A two-stage series-connected integrated nested grading hydrocyclone comprises a primary cylindrical barrel, the top end of the primary cylindrical barrel is connected to a top cover, the top cover of the primary cylindrical barrel is connected to an overflow pipe, and the side wall of the primary cylindrical barrel is connected to a plurality of inlet pipes; the bottom end of the primary cylindrical barrel is connected to an inverted outer conical barrel, an upright inner conical barrel is sleeved in the outer conical barrel, and an end of the outer conical barrel away from the primary cylindrical barrel and an end of the inner conical barrel away from the primary cylindrical barrel are closed and connected via an annular groove. And the side wall of the annular groove is connected to a plurality of outlet pipes; a secondary cylindrical cylinder is sleeved in the primary cylindrical cylinder, and one end of the secondary cylindrical cylinder is connected to the top cover, and the other end of the secondary cylindrical cylinder is connected to a secondary conical cylinder, the secondary conical cylinder is passed through the inner conical cylinder, and the axes of the secondary cylindrical cylinder and the secondary conical cylinder are colinear, and the secondary cylindrical cylinder is connected to the inner conical cylinder; a spiral guide plate is connected in the secondary cylindrical cylinder, and a plurality of rotary inlets are arranged on the side wall of the secondary cylindrical cylinder.

[0007] Furthermore, the secondary truncated cone cylinder includes two sections of inverted truncated cone cylinders with different tapers, and the taper angle of the inverted truncated cone cylinder close to the secondary cylindrical cylinder is greater than the taper angle of the inverted truncated cone cylinder far from the secondary cylindrical cylinder.

[0008] Furthermore, the inner surface of the outer conical cylinder is a parabola, and the outer surface of the inner conical cylinder is a parabola.

[0009] Furthermore, a plurality of square holes are provided on the side wall of the secondary cylindrical barrel, and the rotary inlet includes an arc-shaped baffle connected to one side of the square hole, and the axis of the arc-shaped baffle is parallel to the axis of the secondary cylindrical barrel, so that the opening of the rotary inlet is facing the tangent direction of the secondary cylindrical barrel.

[0010] Furthermore, the highest point of the guide plate is higher than the highest point of the square hole.

[0011] Furthermore, the overflow pipe includes a circular tube and an inverted truncated cone tube with equal wall thickness, the overflow pipe passes through the top cover, and the circular tube is located outside the primary cylindrical tube, and the inverted truncated cone tube is located inside the primary cylindrical tube.

[0012] Furthermore, the inlet pipes are two parallel square pipes, and the two inlet pipes are tangent to the outer side wall of the primary cylindrical barrel, and the openings of the two inlet pipes face opposite directions.

[0013] Furthermore, the primary cylindrical tube is connected to the outer conical tube via a flange.

[0014] Furthermore, the outlet pipes are four square pipes evenly arranged along the circumference of the annular groove, and the square pipes extend along the tangent of the annular groove.

[0015] The principle and beneficial effects of the technical solution are:

[0016] 1. The present invention provides a two-stage series-connected integrated nested grading hydrocyclone, wherein the side wall of the first-stage cylindrical cylinder is provided with a plurality of inlet pipes, which are used to introduce high-speed solid-liquid two-phase flow into the cylindrical tube, the first-stage cylindrical cylinder is connected to the inverted outer conical cylinder, the inverted outer conical cylinder is sleeved with an upright inner conical cylinder, and the bottom end of the inverted outer cylinder and the bottom end of the upright inner conical cylinder are sealed and connected through an annular groove, the upright inner conical cylinder is sleeved with an inverted secondary conical cylinder, and the secondary conical cylinder is sealed and connected to the upper end opening of the inner conical cylinder, the first-stage cylindrical cylinder is sleeved with a secondary cylindrical cylinder, one end of the secondary cylindrical cylinder is connected to the top cover, the other end of the secondary cylindrical cylinder is connected to the secondary conical cylinder, and the axis of the secondary cylindrical cylinder is in line with the axis of the secondary cone, and the side wall of the secondary cylindrical cylinder is provided with a plurality of rotary inlets, the bottom end of the secondary conical cylinder is connected with a secondary bottom flow outlet pipe, and the annular groove is connected with a plurality of outlet pipes;

[0017] The inner wall of the primary cylinder, the outer wall of the secondary cylinder, the inner wall of the outer conical cylinder, the outer wall of the inner conical cylinder and the inner wall of the annular groove form a connected primary separation chamber, and the inner wall of the secondary cylinder and the inner wall of the secondary conical cylinder form a connected secondary separation chamber. The solid-liquid two-phase flow is injected into the primary separation chamber through the inlet pipe at a high speed. The high-speed fluid performs swirling motion along the inner wall in a clockwise direction. The particles with large particle size in the external swirling flow are thrown to the inner wall under the action of inertia, and move downward along the inner wall under the action of gravity. Finally, they fall into the annular groove and are discharged through the outlet pipe together with the liquid. The internal swirling flow carries the particles with small particle size upward in a clockwise direction and reaches the top The liquid that cannot be discharged in time rotates into the secondary separation chamber through the rotary inlet. After reaching the inside of the secondary separation chamber, the flow direction is reorganized through the spiral guide plate, which minimizes the flow collision caused by the inconsistent fluid movement direction and causes a large amount of energy dissipation, so that most of the overall vortex moves in a clockwise direction. The particles with large mass in the external vortex are thrown to the inner wall under the action of inertia, move downward along the inner wall under the action of gravity, and are finally discharged from the secondary bottom flow outlet pipe. The fine particles with smaller mass and after secondary separation move upward in a clockwise direction and are discharged from the overflow port, thereby realizing the secondary classification of raw materials;

[0018] In this way, by nesting the secondary separation chamber in the primary separation chamber, it is helpful to reduce the situation of underflow containing fine particles and overflowing coarse particles, and improve the classification performance; and compared with the series-type hydrocyclone with a pipeline structure, no additional pipeline connection is required, which can greatly reduce the use space and reduce the subsequent maintenance cost. It can further increase the separation particle size while reducing the energy consumption and improving the production efficiency. It can be widely used in various production industries and has strong practicality; in addition, the design structure of the internal nested secondary separation chamber can also prevent the fluid from generating an air column when performing the primary cyclone separation in the primary separation chamber, which can eliminate the phenomenon of air column. In addition to the energy dissipation caused by the air column; and because the generation of the air column will also greatly increase the fluid flow rate at the overflow port, this will aggravate the short-circuit flow and reduce the retention time of the internal circulation flow in the cyclone, greatly reducing the classification efficiency. This structural form makes this situation no longer exist. Therefore, during the first-stage cyclone separation process in the first-stage separation chamber, the damage of the air column to the classification process can be eliminated, thereby achieving the effect of stabilizing the internal flow field of the cyclone and eliminating the energy dissipation caused by the turbulent kinetic energy generated by the air column. The energy dissipation of the flow field is reduced, the separation time of the internal cyclone in the cyclone is increased, and its cyclone separation efficiency is improved.

[0019] 2. The present invention provides a two-stage series-connected integrated nested graded hydrocyclone, wherein the inverted secondary truncated cone cylinder is composed of two sections of truncated cone cylinders with different tapers, and the cone angle of the upper truncated cone cylinder is greater than the cone angle of the lower truncated cone cylinder, and the inner surface of the outer truncated cone cylinder and the outer surface of the inner truncated cone cylinder are both parabolic surfaces, that is, the outer surface of the inner truncated cone cylinder and the inner surface of the outer cone are not linear, but parabolic;

[0020] When the material is injected into the first-stage separation chamber from the inlet pipe at high speed, particles of different sizes begin to move centrifugally. Particles of larger sizes will gather on the cyclone wall due to the greater centrifugal force and move downward by gravity. When entering the parabolic cone section, the parabolic hydrocyclone wall is more conducive to filtering fine particles than the linear type. When used to separate coarse particles, the fine mud desludging rate of the parabolic hydrocyclone is 6 percentage points higher than that of the linear type under the best conditions.

[0021] However, some smaller particles will be rotated into the secondary separation chamber with the upward movement of the inner circulation flow because they do not obtain a large centrifugal force. The flow direction will be reintegrated under the action of the guide plate. When the fluid moves to the first frustum cylinder, the fluid will be pre-accelerated to increase its movement speed on the original basis, in preparation for achieving the centrifugal force required for sorting fine particles. When it reaches the second frustum cylinder, the movement speed of the fluid will be further increased, thereby obtaining a stronger centrifugal force. On this basis, particles with slightly larger particle sizes will be fully thrown onto the inner wall, move downward along the wall surface of the cone, and finally be discharged from the secondary bottom flow outlet pipe. Therefore, finer particles can be sorted while improving the overflow coarseness phenomenon. The double-taper structure is more conducive to separation than the single-taper structure. The double-taper structure helps to increase the tangential velocity of the fluid, increase the centrifugal force of the solid particles, and is more conducive to separation. The smaller the cone angle of the cyclone, the better the separation effect. Small particles will continue to move upward with the inner vortex and finally be discharged from the overflow pipe. The separation performance of the inverted frustum overflow pipe is better than that of the upright frustum overflow pipe.

[0022] 3. The present invention provides a two-stage series-connected integrated nested graded hydrocyclone, wherein the secondary cylindrical barrel is provided with a plurality of rotary inlets, the rotary inlet comprises an arc-shaped baffle connected to one side of the square hole, and the axis of the arc-shaped baffle is parallel to the axis of the secondary cylindrical barrel, so that the opening of the rotary inlet faces the tangential direction of the secondary cylindrical barrel, so that the fluid enters the first separation chamber from the tangential direction of the secondary cylindrical barrel, reducing the resistance of the fluid entering and improving the separation performance; and the highest point of the guide plate is higher than the highest point of the square hole on the side wall of the secondary cylindrical barrel, so as to ensure that the fluid entering from the rotary inlet can be reintegrated by the guide plate, further improving the separation performance; the inlet pipe is two parallel square pipes, and the two square pipes are tangent to the outer wall of the primary cylindrical barrel, and the openings of the two inlet pipes face opposite directions, so that the fluid enters the primary separation chamber from the tangential direction of the primary cylindrical barrel, reducing the resistance of the fluid entering and improving the separation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a two-stage series-connected integrated nested grading hydrocyclone of the present invention;

[0024] Figure 2 It is a schematic diagram of the explosion structure of a two-stage series-connected integrated nested grading hydrocyclone of the present invention;

[0025] Figure 3 A half-section view of a two-stage series-connected integrated nested grading hydrocyclone according to the present invention;

[0026] Figure 4 It is a structural schematic diagram of a primary cylindrical barrel and an upper flange of a two-stage series-connected integrated nested grading hydrocyclone of the present invention;

[0027] Figure 5 It is a schematic diagram of a half-section structure of a primary cylindrical barrel and an upper flange of a two-stage series-connected integrated nested grading hydrocyclone of the present invention;

[0028] Figure 6 It is a schematic diagram of the connection structure of the outer cylindrical cylinder, the inner cylindrical cylinder, the annular groove and the lower flange of a two-stage series-connected integrated nested grading hydrocyclone of the present invention;

[0029] Figure 7 It is a schematic diagram of a half-section structure of the connection between the outer cylindrical cylinder, the inner cylindrical cylinder, the annular groove and the lower flange of a two-stage series-connected integrated nested grading hydrocyclone of the present invention;

[0030] Figure 8 It is a schematic diagram of the connection structure of the secondary cylindrical cylinder, the secondary truncated cone cylinder, the rotary inlet and the guide plate of a two-stage series-connected integrated nested grading hydrocyclone of the present invention;

[0031] Fig. 9 It is a schematic diagram of a half-section structure of a two-stage series-connected integrated nested grading hydrocyclone of the present invention, including a secondary cylindrical cylinder, a secondary truncated cone cylinder, a rotary inlet, and a guide plate;

[0032] The names of the corresponding marks in the accompanying drawings are:

[0033] Primary cylindrical tube 1, secondary cylindrical tube 3, secondary truncated cone tube 4, top cover screw 5, overflow pipe 6, upper countersunk screw hole 7, inlet pipe 8, bolt 9, threaded hole 10, upper flange 11, lower flange 12, rotary inlet 13, guide plate 14, lower countersunk screw hole 15, inner truncated cone tube 16, outer truncated cone tube 17, outlet pipe 19, annular groove 20, bottom screw 21, secondary underflow outlet pipe 22, primary separation chamber 23, secondary separation chamber 24, thickened structure 25. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0035] like Figures 1 to 9As shown, a two-stage series-connected integrated nested grading hydrocyclone comprises a primary cylindrical barrel 1, the top of the primary cylindrical barrel 1 is connected to a top cover, the top cover and the primary cylindrical barrel 1 are integrally formed, and eight upper countersunk screw holes 7 are opened on the surface of the top cover along the circumferential direction; the top cover of the primary cylindrical barrel 1 is connected to an overflow pipe 6, the overflow pipe 6 comprises a round tube and an inverted frustum tube of equal wall thickness, the overflow pipe 6 passes through the top cover, and the round tube is located outside the primary cylindrical barrel 1, and the inverted frustum tube is located inside the primary cylindrical barrel 1; the side wall of the primary cylindrical barrel 1 is connected to an inlet pipe 8, the inlet pipe 8 is two parallel square tubes, and the two square tubes are tangent to the outer wall of the primary cylindrical barrel 1 , and the openings of the two inlet pipes 8 face opposite directions; the bottom end of the primary cylindrical tube 1 is connected to an inverted outer conical tube 17, specifically, the primary cylindrical tube 1 is connected to an upper flange 11, and the outer conical tube 17 is connected to a lower flange 12, and the upper flange 11 and the lower flange 12 are evenly provided with eight threaded holes 10 along the circumferential direction, and the upper flange 11 and the lower flange 12 are connected by bolts 9; an upright inner conical tube 16 is sleeved in the outer conical tube 17, and an end of the outer conical tube 17 away from the primary cylindrical tube 1 and an end of the inner conical tube 16 away from the primary cylindrical tube 1 are closed and connected by an annular groove 20, and the side wall of the annular groove 20 Four outlet pipes 19 are connected, and the four outlet pipes 19 are evenly distributed along the circumference of the annular groove 20. The outlet pipes 19 are square tubes and extend along the tangent direction of the annular groove 20; the inner surface of the outer conical tube 17 is a parabola, and the outer surface of the inner conical tube 16 is a parabola; a secondary cylindrical tube 3 is sleeved in the primary cylindrical tube 1, and one end of the secondary cylindrical tube 3 is connected to the top cover by eight top cover screws 5, and the other end of the secondary cylindrical tube 3 is connected to the secondary conical tube 4, wherein the secondary cylindrical tube 3 and the secondary conical tube 4 are integrally formed or connected by welding, and the axes of the secondary cylindrical tube 3 and the secondary conical tube 4 are colinear, and the secondary conical tube 4 is penetrated In the inner conical cylinder 16, the secondary cylindrical cylinder 3 is connected to the inner conical cylinder 16. Specifically, an annular thickened structure 25 for opening a countersunk screw hole 15 is provided at one end of the inner conical cylinder 16 close to the primary cylindrical cylinder 1. The thickened structure 25 is evenly provided with eight countersunk screw holes 15 along the circumferential direction. The bottom screw 21 passes through the countersunk screw holes 15 from the bottom to connect the inner conical cylinder 16 and the secondary cylindrical cylinder 3 together. The secondary conical cylinder 4 includes two sections of conical cylinders with different tapers, and the cone angle of the upper conical cylinder is greater than the cone angle of the lower conical cylinder. The end of the lower conical cylinder away from the primary cylindrical cylinder 1 is connected to a secondary bottom flow outlet pipe 22;A spiral guide plate 14 is connected inside the secondary cylinder 3. The direction of rotation of the guide plate 14 from top to bottom is consistent with the direction of rotation of the fluid into the secondary cylinder 3. The side wall of the secondary cylinder 3 is provided with a plurality of rotary inlets 13. Specifically, the side wall of the secondary cylinder 3 is provided with a plurality of square holes. The rotary inlet 13 includes an arc-shaped baffle connected to one side of the square hole. A horizontal baffle is connected between the two arc ends of the arc-shaped baffle and the outer wall of the secondary cylinder 3. The axis of the arc-shaped baffle is parallel to the axis of the secondary cylinder 3. The arc plate and the two horizontal baffles form an arc-shaped channel so that the opening of the rotary inlet 13 faces the tangent direction of the secondary cylinder 3, thereby allowing the fluid to enter from the tangent direction of the secondary cylinder 3. The highest point of the guide plate 14 is higher than the highest point of the square hole. ;

[0036] The specific implementation process is as follows:

[0037] To assemble the hydrocyclone, firstly, the lower surface of the secondary cylindrical barrel 3, i.e., the side away from the rotary inlet 13, is welded and assembled with the upper conical surface of the secondary truncated cone barrel 4, and then the top cover screws 5 are used to screw in the inner surface of the top cover of the primary cylindrical barrel 1 and the upper surface of the secondary cylindrical barrel 3 to engage with each other, and then the primary truncated cone barrel 2 is sleeved on the secondary truncated cone barrel 4, and the secondary truncated cone barrel 4 is penetrated from top to bottom, so that the upper surface of the inner truncated cone barrel 16 and the lower surface of the secondary cylindrical barrel 3 overlap each other, and the bottom countersunk screws are penetrated from the bottom to connect and fix each other by screwing, and finally the upper flange 11 of the primary cylindrical barrel 1 and the lower flange 12 of the outer truncated cone barrel 17 are fixed by bolts 9, and the processing technology requires that the bolt connection and the screw connection end faces meet the plane sealing; after the installation is completed, the solid-liquid two-phase flow is injected into the internal cavity through the inlet pipe 8 at a higher speed for secondary classification of the raw materials.

[0038] In summary, the inner wall of the primary cylindrical tube 1, the outer wall of the secondary cylindrical tube, the inner wall of the outer conical tube 17, the outer wall of the inner conical tube 16, and the inner wall of the annular groove 20 form a connected primary separation chamber 23, and the inner wall of the secondary cylindrical tube 3 and the inner wall of the secondary conical tube 4 form a connected secondary separation chamber 24. The solid-liquid two-phase flow is injected into the primary separation chamber 23 through the inlet pipe 8 at a relatively high speed, and the high-speed fluid performs a swirling motion along the inner wall in a clockwise direction. The particles with large particle sizes in the external swirling flow are thrown to the inner wall under the action of inertia, and move downward along the inner wall under the action of gravity, and finally fall into the annular groove 20 and are discharged through the outlet pipe 19 together with the liquid. The internal swirling flow carries the particles with small particle sizes upward in a clockwise direction. After reaching the top, the liquid that has not been discharged in time is rotated into the secondary separation chamber 24 through the rotary inlet 13. After reaching the inside of the secondary separation chamber 24, the flow direction is reintegrated through the spiral guide plate 14, which minimizes the large amount of energy dissipation caused by the flow collision due to the inconsistent fluid movement direction, so that most of the overall vortex moves in a clockwise direction. The particles with large mass in the external vortex are thrown to the inner wall under the action of inertia, move downward along the inner wall under the action of gravity, and are finally discharged from the secondary bottom flow outlet pipe 22. The fine particles with smaller mass and after secondary separation in the internal vortex move upward in a clockwise direction and are discharged from the overflow port, thereby realizing the secondary classification of the raw materials;

[0039] By nesting the secondary separation chamber 24 in the primary separation chamber 23, it is helpful to reduce the situation of underflow containing fine particles and overflowing coarse particles, thereby improving the classification performance. Compared with the series-type hydrocyclone with a pipeline structure, no additional pipeline connection is required, which can greatly reduce the use space and the subsequent maintenance cost. It can further improve the separation particle size while reducing the energy consumption and improving the production efficiency. It can be widely used in various production industries and has strong practicality. In addition, the design structure of the internal nested secondary separation chamber 24 can also prevent the fluid from generating an air column when performing the primary cyclone separation in the primary separation chamber 23. The energy dissipation caused by the air column can be eliminated; and the generation of the air column will also greatly increase the fluid flow rate at the overflow port, which will aggravate the short-circuit flow and reduce the retention time of the internal circulation flow in the cyclone, greatly reducing the classification efficiency. This structural form makes this situation no longer exist. Therefore, during the first-stage cyclone separation process in the first-stage separation chamber 23, the damage of the air column to the classification process can be eliminated, thereby achieving the effect of stabilizing the internal flow field of the cyclone and eliminating the energy dissipation caused by the turbulent kinetic energy generated by the air column. The energy dissipation of the flow field is reduced, the separation time of the internal cyclone in the cyclone is increased, and the cyclone separation efficiency is improved.

[0040] The above is only an embodiment of the present invention, and common knowledge such as the known specific technical solutions or characteristics in the solution is not described in detail here. The "top", "bottom", "upper end", "lower end", "above" and "below" in the text correspond to the "top", "bottom", "upper end", "lower end", "above" and "below" of the components in the corresponding drawings. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the technical solution of the present invention, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A two-stage series-connected integrated nested grading hydrocyclone, characterized in that: The invention comprises a primary cylindrical cylinder (1), the top end of the primary cylindrical cylinder (1) is connected to a top cover, the top cover of the primary cylindrical cylinder (1) is connected to an overflow pipe (6), and the side wall of the primary cylindrical cylinder (1) is connected to a plurality of inlet pipes (8); the bottom end of the primary cylindrical cylinder (1) is connected to an inverted outer conical cylinder (17), an upright inner conical cylinder (16) is sleeved in the outer conical cylinder (17), and an end of the outer conical cylinder (17) away from the primary cylindrical cylinder (1) and an end of the inner conical cylinder (16) away from the primary cylindrical cylinder (1) are closed and connected via an annular groove (20), and the side wall of the annular groove (20) is A plurality of outlet pipes (19) are connected; a secondary cylindrical cylinder (3) is sleeved inside the primary cylindrical cylinder (1), and one end of the secondary cylindrical cylinder (3) is connected to the top cover, and the other end of the secondary cylindrical cylinder (3) is connected to a secondary conical cylinder (4), and the secondary conical cylinder (4) is inserted into the inner conical cylinder (16), and the axes of the secondary cylindrical cylinder (3) and the secondary conical cylinder (4) are colinear, and the secondary cylindrical cylinder (3) is connected to the inner conical cylinder (16); a spiral guide plate (14) is connected inside the secondary cylindrical cylinder (3), and a plurality of rotary inlets (13) are arranged on the side wall of the secondary cylindrical cylinder (3).

2. A two-stage series-connected integrated nested grading hydrocyclone according to claim 1, characterized in that: The secondary truncated cone cylinder (4) comprises two sections of inverted truncated cone cylinders with different tapers, and the taper angle of the inverted truncated cone cylinder close to the secondary cylindrical cylinder (3) is greater than the taper angle of the inverted truncated cone cylinder far from the secondary cylindrical cylinder (3).

3. A two-stage series-connected integrated nested grading hydrocyclone according to claim 1, characterized in that: The inner surface of the outer conical cylinder (17) is a parabola, and the outer surface of the inner conical cylinder (16) is a parabola.

4. The two-stage series-connected integrated nested grading hydrocyclone according to claim 1, characterized in that: The side wall of the secondary cylindrical barrel (3) is provided with a plurality of square holes, and the rotary inlet (13) comprises an arc-shaped baffle connected to one side of the square hole, and the axis of the arc-shaped baffle is parallel to the axis of the secondary cylindrical barrel (3), so that the opening of the rotary inlet (13) faces the tangent direction of the secondary cylindrical barrel (3).

5. A two-stage series-connected integrated nested grading hydrocyclone according to claim 4, characterized in that: The highest point of the guide plate (14) is higher than the highest point of the square hole.

6. The two-stage series-connected integrated nested grading hydrocyclone according to claim 1, characterized in that: The overflow pipe (6) comprises a circular tube and an inverted truncated cone tube with equal wall thickness; the overflow pipe (6) passes through the top cover, and the circular tube is located outside the primary cylindrical tube (1), while the inverted truncated cone tube is located inside the primary cylindrical tube (1).

7. The two-stage series-connected integrated nested grading hydrocyclone according to claim 1, characterized in that: The inlet pipes (8) are two parallel square pipes, and the two inlet pipes (8) are tangent to the outer side wall of the primary cylindrical tube (1), and the openings of the two inlet pipes (8) face in opposite directions.

8. The two-stage series-connected integrated nested grading hydrocyclone according to claim 1, characterized in that: The primary cylindrical cylinder (1) and the outer conical cylinder (17) are connected via a flange.

9. The two-stage series-connected integrated nested grading hydrocyclone according to claim 1, characterized in that: The outlet pipes (19) are four square pipes evenly arranged along the circumference of the annular groove (20), and the square pipes extend along the tangent of the annular groove (20).

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