Unpowered double centrifugal prefilter integrated with centrifugal pump

Abstract

The application discloses a kind of unpowered double centrifugal pre-filter integrated with centrifugal pump, belong to coal mine underground drainage equipment technical field, including the primary centrifugal filter in top, it is connected with secondary centrifugal filter in the directly below of primary centrifugal filter, the secondary centrifugal filter includes bottom casing and coaxially located in centrifugal precipitation cylinder of bottom casing, rear water outlet is established in the side surface of bottom casing and is communicated with centrifugal pump;No power drive mechanism is further established and is drivingly connected with centrifugal precipitation cylinder in the rear end of centrifugal pump. By setting secondary centrifugal filter, the water body after primary filtration is carried out second centrifugal separation, the removal ability of fine particles is significantly improved;Centrifugal pump itself motor is used simultaneously through no power drive mechanism to drive centrifugal precipitation cylinder to rotate, initiative intensifies centrifugal field, without additional power source, both improve separation efficiency, and realize integrated linkage with centrifugal pump, compact structure, energy-efficient.

Description

Technical Field

[0001] This invention relates to the field of underground drainage equipment technology in coal mines, specifically to a non-powered dual centrifugal pre-filter integrated with a centrifugal pump. Background Technology

[0002] During underground coal mining operations, a large amount of water accumulates at the working face, containing solid particles such as coal dust, rock cuttings, and silt. To maintain safe production at the working face, centrifugal pumps are typically used to promptly pump out the accumulated water and discharge it to the surface or a central water tank. However, the high-speed rotation of the centrifugal pump impeller makes it highly sensitive to the quality of the incoming water. If the water contains a large number of hard particles, it can easily cause impeller cavitation, wear, and blockage, and even lead to pump body vibration and seal failure, seriously affecting the operational stability and service life of the centrifugal pump. To alleviate this problem, a centrifugal filter is usually installed before the centrifugal pump inlet to perform preliminary solid-liquid separation of the water using centrifugal force.

[0003] Existing centrifugal filters mostly employ a single-stage centrifugal structure, primarily consisting of a top casing and a filter cartridge coaxially mounted within the casing. A tangential inlet is positioned on the side of the casing, allowing water to enter tangentially and create a swirling flow. Larger particles are thrown outwards and settle under centrifugal force, while clearer water flows out from the center of the filter cartridge and enters the centrifugal pump. However, these single-stage centrifugal filters still have the following problems in practical use: The single filtration stage results in poor separation: relying solely on centrifugal separation has limited effectiveness in removing suspended particles with small diameters or low density. Especially when the concentration of impurities in the well water is high and the particle size distribution is wide, a large number of fine particles will still enter the centrifugal pump with the water flow, causing continuous wear on the pump body. Insufficient sedimentation space leads to secondary re-suspension of impurities: Existing filters lack a dedicated sedimentation and isolation structure. Impurities that have settled are easily re-suspended under the disturbance of continuous incoming water and carried into the outlet side, reducing the actual filtration effect. Lack of enhanced separation mechanism: Static centrifugal filtration relies on the natural swirling of water flow, and the centrifugal force field strength is limited. The separation effect is further reduced, especially under low flow conditions, and there are no auxiliary enhancement methods. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a non-powered dual centrifugal pre-filter that is integrated with a centrifugal pump. Through the synergistic design of two-stage centrifugal separation and non-powered enhanced vortex flow, it can further achieve effective pretreatment of high-impurity water in coal mines, thereby reducing centrifugal pump wear, protecting the safe operation of the centrifugal pump, and extending its service life. This solves the problems of poor impurity separation effect, easy secondary suspension of impurities, and weakened separation mechanism of existing centrifugal filters.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is implemented as follows: A non-powered dual centrifugal pre-filter integrated with a centrifugal pump includes a primary centrifugal filter located at the top. The primary centrifugal filter includes a top housing and a filter cartridge coaxially located within the top housing. A pre-inlet tangentially connected to a drain pipe is provided on the side of the top housing. The core improvement lies in the secondary centrifugal filter connected directly below the primary centrifugal filter. The secondary centrifugal filter includes a bottom housing and a centrifugal sedimentation cartridge coaxially located within the bottom housing. A rear outlet connected to the centrifugal pump is provided on the side of the bottom housing. A non-powered drive mechanism is also provided at the rear end of the centrifugal pump, which is driven by the centrifugal sedimentation cartridge. This non-powered drive mechanism transmits power to the centrifugal impeller via the centrifugal pump's motor.

[0006] By adopting the above scheme, a second centrifugal separation is performed on the water after primary filtration by setting up a two-stage centrifugal filter, which significantly improves the removal capacity of fine particles. At the same time, the centrifugal pump's own motor drives the centrifugal sedimentation tank to rotate through a non-powered drive mechanism, actively strengthening the centrifugal force field without the need for an additional power source. This not only improves the separation efficiency but also achieves integrated linkage with the centrifugal pump, resulting in a compact, energy-efficient, and highly effective structure.

[0007] As a preferred embodiment of a non-powered dual centrifugal pre-filter integrated with a centrifugal pump, a bottom opening communicating with the secondary centrifugal filter is provided at the bottom of the filter cylinder, and a top opening communicating with the primary centrifugal filter is provided at the top of the centrifugal sedimentation cylinder. The diameter of the top opening is larger than the diameter of the bottom opening, which can form a gradually expanding flow channel, which is conducive to the smooth flow of water from the primary filter into the secondary filter, reducing local resistance and head loss; at the same time, it facilitates the downward settling of impurities into the bottom of the centrifugal sedimentation cylinder, avoiding backflow or blockage.

[0008] As a preferred embodiment of a non-powered dual centrifugal pre-filter integrated with a centrifugal pump, the centrifugal sedimentation cylinder is suspended entirely within the bottom casing. The top, side, and bottom walls of the centrifugal sedimentation cylinder do not contact the bottom casing, ensuring smooth operation and low noise during rotation without interference from casing friction. At the same time, the suspended structure forms an annular channel outside the cylinder, facilitating the upward flow of the separated clean water and its discharge from the rear outlet, further optimizing the flow channel layout.

[0009] As a preferred embodiment of a non-powered dual centrifugal pre-filter integrated with a centrifugal pump, the bottom of the centrifugal sedimentation tank is coaxially provided with an annular sedimentation tank. The annular sedimentation tank is specifically used to collect the settled solid impurities and effectively isolate them from the upper clear water zone. Furthermore, the height of the annular sedimentation tank is no higher than half of the total internal height of the centrifugal sedimentation tank to prevent the sedimentation tank from being too deep and causing impurities to be carried up again during rotation, thus ensuring sedimentation stability and separation effect.

[0010] As a preferred embodiment of a non-powered dual centrifugal pre-filter integrated with a centrifugal pump, multiple vertically extending centrifugal agitator blades are connected to the inner wall of the centrifugal sedimentation cylinder and arranged in a circumferential array. All centrifugal agitator blades are located in an annular sedimentation tank. The agitator blades can rotate together with the centrifugal sedimentation cylinder, generating a strong radial and tangential flow field in the annular sedimentation tank. This further promotes the migration and sedimentation of impurities to the outer edge of the tank, prevents impurities from caking, and enhances the centrifugal separation of fine particles, thereby improving the overall filtration accuracy.

[0011] As a preferred embodiment of a non-powered dual centrifugal pre-filter integrated with a centrifugal pump, the primary centrifugal filter and the secondary centrifugal filter are detachable. Multiple evenly distributed vertical supports are fixed on the outer wall of the bottom housing. Each vertical support is equipped with a screw and a butterfly nut at its top. The tightening or loosening of the top and bottom housings is achieved by the engagement of the screw and the butterfly nut. The two-stage filters can be quickly assembled and disassembled without special tools. This facilitates regular cleaning of sediment and maintenance of the filter cartridge and centrifugal sedimentation cartridge, significantly reducing maintenance difficulty and downtime, and meeting the needs of frequent downhole maintenance.

[0012] As a preferred embodiment of a non-powered dual centrifugal pre-filter integrated with a centrifugal pump, the non-powered drive mechanism includes a vertical bevel gear coaxially connected to the shaft of a dual-shaft extension motor next to the centrifugal pump; a transverse bevel gear meshing with the vertical bevel gear; a drive pulley coaxially connected to the bottom of the transverse bevel gear; and a driven pulley extending beyond the bottom housing coaxially connected to the bottom of the centrifugal sedimentation tank; a belt connecting the drive pulley and the driven pulley; the power direction is changed from vertical to horizontal through a bevel gear set, and then the power is transmitted to the centrifugal sedimentation tank through belt drive. The layout is reasonable and the transmission is smooth; it uses the idle extension shaft of the centrifugal pump motor as a power source, eliminating the need for an additional motor, achieving "non-powered" drive, saving energy and having a high degree of integration.

[0013] As a preferred embodiment of a non-powered dual centrifugal pre-filter integrated with a centrifugal pump, the vertical conical tooth shaft is further supported by a top bearing seat, and the horizontal conical tooth shaft is further supported by a bottom bearing seat. The bearing seats provide stable support for the conical tooth shaft, improve the rigidity and rotational accuracy of the transmission system, reduce vibration and wear, extend the service life of the drive mechanism, and ensure long-term stable operation of the centrifugal sedimentation tank.

[0014] As a preferred embodiment of a non-powered dual centrifugal pre-filter integrated with a centrifugal pump, the diameter of the transverse conical teeth is larger than the diameter of the vertical conical teeth, and the diameter of the driven pulley is larger than the diameter of the driving pulley. Through the dual reduction design of the conical teeth and pulleys, the high speed of the centrifugal pump motor is converted into a moderate speed of the centrifugal sedimentation tank, which ensures that the centrifugal force field is strong enough, while avoiding excessive water flow disturbance or increased energy consumption due to excessive speed, thus achieving the best balance between separation efficiency and energy consumption.

[0015] As a preferred embodiment of a non-powered dual centrifugal pre-filter integrated with a centrifugal pump, the primary centrifugal filter, secondary centrifugal filter, centrifugal pump, and non-powered drive mechanism are all installed on an integrated skid. The integrated skid installation integrates the filter, centrifugal pump, and drive mechanism into a single module, which facilitates overall transportation, installation, and fixation, and is suitable for narrow underground spaces. Parts of the primary centrifugal filter, secondary centrifugal filter, centrifugal pump, and non-powered drive mechanism are exposed on the top surface of the integrated skid, while the pulley drive part of the non-powered drive mechanism is hidden in the bottom groove of the integrated skid. This protects the transmission components from the harsh underground environment (such as dripping water and falling rocks) and prevents accidental contact by personnel, improving safety and cleanliness.

[0016] After adopting the above technical solution, the beneficial effects of the present invention are: 1. Dual centrifugal separation significantly improves filtration efficiency: Through the synergy of primary and secondary centrifugal filters, two-stage centrifugal separation is achieved, which greatly improves the solid-liquid separation efficiency of high-impurity water in coal mines, effectively reduces the number and size of particles entering the centrifugal pump, significantly reduces the risk of centrifugal pump wear and blockage, and extends the service life of the equipment. 2. No power required, energy-saving and highly integrated: The centrifugal pump uses its own dual-shaft extension motor to drive the centrifugal sedimentation tank to rotate through a bevel gear-belt transmission mechanism, without the need for an additional power source, achieving "no power" enhanced separation. At the same time, the filter and centrifugal pump are highly integrated in terms of power, resulting in a compact structure and low energy consumption. 3. Smooth and efficient operation due to speed reduction transmission design: The high speed of the motor is converted into the optimal speed of the centrifugal sedimentation tank through the dual speed reduction of bevel gear and pulley. This ensures sufficient centrifugal force while avoiding excessive disturbance of water flow, achieving the best balance between separation efficiency and energy consumption. 4. Combined sedimentation and turbulence for excellent anti-clogging performance: The centrifugal sedimentation tank is equipped with an annular sedimentation tank at the bottom and a circumferential array of centrifugal stirring blades. This provides a dedicated space for impurity collection and prevents impurities from caking and secondary suspension through blade rotation, ensuring long-term operational stability and filtration accuracy. 5. Quick-release maintenance structure to meet the needs of high-frequency maintenance in the well: The butterfly head nut and screw are quick-release connected, which can quickly separate the two-stage filter without tools, making it easy to clean the sediment and maintain the internal components, greatly shortening the maintenance time and improving the availability of the drainage system; 6. Integrated skid-mounted design for convenient installation and high safety: The entire set of equipment is integrated on a skid, which facilitates overall transportation, installation and fixation; the pulley drive part is hidden in the bottom groove, which protects the transmission components and avoids accidental contact by personnel, adapts to the complex underground environment and improves the safety of on-site use. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A three-dimensional structural diagram of a non-powered dual centrifugal pre-filter integrated with a centrifugal pump, taken from the first angle. Figure 2 A three-dimensional structural diagram of a non-powered dual centrifugal pre-filter integrated with a centrifugal pump, taken from a second angle. Figure 3 To showcase Figure 1 A three-dimensional structural diagram of the internal structure of the integrated skid; Figure 4 This is a three-dimensional structural diagram of the primary centrifugal filter and the secondary centrifugal filter; Figure 5 for Figure 4 A magnified view of a section at point A in the middle; Figure 6 A three-dimensional structural diagram showing the internal structure of the primary and secondary centrifugal filters in a vertical orientation; Figure 7 This is a three-dimensional structural diagram showing the internal structure of a secondary centrifugal filter in a horizontal orientation.

[0019] The diagram shows the following markings: 1-Primary centrifugal filter; 11-Top housing; 12-Filter cartridge; 13-Pre-inlet; 14-Bottom opening; 2-Secondary centrifugal filter; 21-Bottom housing; 22-Centrifugal sedimentation tank; 23-Post-outlet; 24-Top opening; 25-Annular sedimentation tank; 26-Centrifugal agitator blades; 3-Vertical support; 4-Screw; 5-Butterfly head nut; 6-Centrifugal pump; 7-Dual-shaft extension motor; 8-Non-powered drive mechanism; 81-Vertical bevel gear; 82-Horizontal bevel gear; 83-Drive pulley; 84-Driven pulley; 85-Belt; 86-Top bearing housing; 87-Bottom bearing housing; 9-Drain pipe; 10-Integrated skid. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1 to 2 , Figure 4 , Figure 6 As shown, a non-powered dual centrifugal pre-filter integrated with a centrifugal pump is provided, including a primary centrifugal filter 1 located at the top. The primary centrifugal filter 1 includes a top housing 11 and a filter cartridge 12 coaxially located within the top housing 11. A front inlet 13 connected to a drain pipe 9 is provided tangentially on the side of the top housing 11. A secondary centrifugal filter 2 is connected directly below the primary centrifugal filter 1. The secondary centrifugal filter 2 includes a bottom housing 21 and a centrifugal sedimentation cartridge 22 coaxially located within the bottom housing 21. A rear outlet 23 connected to a centrifugal pump 6 is provided on the side of the bottom housing 21. A non-powered drive mechanism 8 is also provided at the rear end of the centrifugal pump 6, which is drivenly connected to the centrifugal sedimentation cartridge 22. The non-powered drive mechanism 8 transmits power to the centrifugal impeller through the motor of the centrifugal pump 6. By setting up a secondary centrifugal filter 2, the water after primary filtration is centrifuged a second time, which significantly improves the ability to remove fine particles. At the same time, the centrifugal pump 6 uses its own motor to drive the centrifugal sedimentation cylinder 22 to rotate through the non-powered drive mechanism 8, which actively strengthens the centrifugal force field. No additional power source is required, which not only improves the separation efficiency, but also realizes the integrated linkage with the centrifugal pump 6. The structure is compact, energy-saving and efficient.

[0022] like Figure 6As shown, the bottom of the filter cylinder 12 is provided with a bottom opening 14 that communicates with the secondary centrifugal filter 2, and the top of the centrifugal sedimentation cylinder 22 is provided with a top opening 24 that communicates with the primary centrifugal filter 1. The diameter of the top opening 24 is larger than the diameter of the bottom opening 14, which can form a gradually expanding flow channel, which is conducive to the smooth flow of water from the primary filter into the secondary filter, reducing local resistance and head loss; at the same time, it facilitates the downward settling of impurities into the bottom of the centrifugal sedimentation cylinder 22, avoiding backflow or blockage.

[0023] Continue as Figure 6 As shown, the centrifugal sedimentation cylinder 22 is suspended entirely inside the bottom casing 21. The top wall, side wall and bottom wall of the centrifugal sedimentation cylinder 22 do not contact the bottom casing 21, so that it is not disturbed by the friction of the casing when rotating, and the operation is stable and the noise is low. At the same time, the suspended structure forms an annular channel outside the cylinder, which facilitates the upward flow of the separated clear water and its discharge from the rear outlet 23, further optimizing the flow channel layout.

[0024] like Figures 6 to 7 As shown, the bottom of the centrifugal sedimentation cylinder 22 is coaxially provided with an annular sedimentation tank 25. The annular sedimentation tank 25 is specifically used to collect the solid impurities after sedimentation and effectively isolate them from the upper clear water zone. Furthermore, the height of the annular sedimentation tank 25 is no higher than half of the total internal height of the centrifugal sedimentation cylinder 22, so as to avoid the sedimentation tank being too deep and causing the impurities to be carried up again during rotation, thus ensuring sedimentation stability and separation effect.

[0025] like Figure 7 As shown, multiple vertically extending centrifugal agitator blades 26 are connected to the inner wall of the centrifugal sedimentation cylinder 22 and are arranged in a circumferential array. All centrifugal agitator blades 26 are located in the annular sedimentation tank 25. The agitator blades can rotate together with the centrifugal sedimentation cylinder 22, generating a strong radial and tangential flow field in the annular sedimentation tank 25. This further promotes the migration and sedimentation of impurities to the outer edge of the tank, prevents impurities from caking, and enhances the centrifugal separation of fine particles, thereby improving the overall filtration accuracy.

[0026] like Figures 4 to 5 As shown, the primary centrifugal filter 1 and the secondary centrifugal filter 2 are detachable; multiple evenly distributed vertical supports 3 are fixed on the outer wall of the bottom housing 21, and a screw 4 and a butterfly nut 5 are installed at the top of each vertical support 3. The tightening or loosening of the top housing and the bottom housing is achieved by the engagement of the screw 4 and the butterfly nut 5. The two-stage filters can be quickly assembled and disassembled without special tools, which is convenient for regular cleaning of sediment impurities and maintenance of filter cartridge 12 and centrifugal sedimentation cartridge 22, significantly reducing maintenance difficulty and downtime, and meeting the needs of frequent downhole maintenance.

[0027] like Figure 3As shown, the non-powered drive mechanism 8 includes a vertical bevel gear 81 coaxially connected to the shaft of the dual-shaft extension motor 7 next to the centrifugal pump 6. A transverse bevel gear 82 meshes with the vertical bevel gear 81. A drive pulley 83 is coaxially connected to the bottom end of the transverse bevel gear 82. A driven pulley 84 extending beyond the bottom housing 21 is coaxially connected to the bottom of the centrifugal sedimentation tank 22. A belt 85 connects the drive pulley 83 and the driven pulley 84. The power direction is changed from vertical to horizontal through the bevel gear set, and then the power is transmitted to the centrifugal sedimentation tank 22 through belt drive. The layout is reasonable and the transmission is smooth. The idle extension shaft of the centrifugal pump 6 motor is used as the power source, eliminating the need for an additional motor and achieving "non-powered" drive, which is energy-saving and highly integrated.

[0028] Continue as Figure 3 As shown, the shaft of the vertical bevel tooth 81 is further supported by the top bearing seat 86, and the shaft of the horizontal bevel tooth 82 is further supported by the bottom bearing seat 87. The bearing seats provide stable support for the bevel tooth shafts, improve the rigidity and rotational accuracy of the transmission system, reduce vibration and wear, extend the service life of the drive mechanism, and ensure the long-term stable operation of the centrifugal sedimentation tank 22.

[0029] Continue as Figure 3 As shown, the diameter of the transverse bevel tooth 82 is larger than the diameter of the vertical bevel tooth 81, and the diameter of the driven pulley 84 is larger than the diameter of the driving pulley 83. Through the dual reduction design of bevel teeth and pulleys, the high speed of the centrifugal pump 6 motor is converted into a moderate speed of the centrifugal sedimentation tank 22, which ensures that the centrifugal force field is strong enough, and avoids excessive water flow disturbance or increased energy consumption due to excessive speed, thus achieving the best balance between separation efficiency and energy consumption.

[0030] like Figures 1 to 3 As shown, the primary centrifugal filter 1, the secondary centrifugal filter 2, the centrifugal pump 6, and the non-powered drive mechanism 8 are all installed on the integrated skid 10. The integrated skid 10 installation integrates the filter, centrifugal pump 6, and drive mechanism into a single module, which facilitates overall transportation, installation, and fixation, and is suitable for narrow underground spaces. Some structures of the primary centrifugal filter 1, the secondary centrifugal filter 2, the centrifugal pump 6, and the non-powered drive mechanism 8 are exposed on the top surface of the integrated skid 10. The pulley drive part of the non-powered drive mechanism 8 is hidden in the bottom groove of the integrated skid 10, which protects the transmission components from the harsh underground environment (such as dripping water and falling rocks) and avoids accidental contact by personnel, improving safety and cleanliness.

[0031] like Figures 1 to 7 As shown, the working principle of this non-powered dual centrifugal pre-filter integrated with a centrifugal pump is as follows: Primary centrifugal filtration: The accumulated water in the coal mine enters the top casing 11 tangentially from the front water inlet 13 through the drain pipe 9. The water flow forms a strong vortex inside the casing. Larger particles of impurities are thrown towards the inner wall of the casing and sink downwards under the action of centrifugal force. The cleaner water passes through the filter cylinder 12 into its central area and flows into the secondary centrifugal filter 2 through the bottom opening 14. Secondary centrifugal filtration and sedimentation: Water flows into the centrifugal sedimentation cylinder 22 through the top opening 24. At this time, the non-powered drive mechanism 8 drives the centrifugal sedimentation cylinder 22 to rotate at a moderate speed. The water inside the cylinder forms a secondary centrifugal force field as the cylinder rotates, and the fine particles further migrate towards the cylinder wall and settle in the annular sedimentation tank 25. The rotation of the centrifugal agitator blades 26 enhances the disturbance inside the tank, promotes the accumulation of impurities to the outer edge and prevents caking. The separated clear water flows upward and is discharged from the rear outlet 23 through the annular channel between the centrifugal sedimentation cylinder 22 and the bottom casing 21, and enters the centrifugal pump 6. Non-powered drive transmission: After the centrifugal pump 6 starts, the extended shaft of its dual-shaft extension motor 7 drives the vertical bevel gear 81 to rotate. The power is then diverted through the meshing horizontal bevel gear 82, and then transmitted to the bottom of the centrifugal sedimentation tank 22 after being reduced in speed by the driving pulley 83, belt 85, and driven pulley 84, thus realizing its rotation. The entire drive process requires no additional power source and relies entirely on the motor of the centrifugal pump 6, which is energy-saving and has good synchronization. Maintenance and Cleaning: When impurities accumulate in the sedimentation tank, manually loosen the butterfly nut 5 and disassemble the primary centrifugal filter 1 upwards to clean the filter cylinder 12, centrifugal sedimentation cylinder 22, and annular sedimentation tank 25. After maintenance, reassemble and tighten the butterfly nut 5 to restore operation.

Claims

1. A non-powered dual centrifugal pre-filter integrated with a centrifugal pump, comprising a primary centrifugal filter located at the top, the primary centrifugal filter including a top housing and a filter cartridge coaxially located within the top housing, and a pre-inlet tangentially connected to a drain pipe is provided on the side of the top housing; characterized in that: A secondary centrifugal filter is connected directly below the primary centrifugal filter. The secondary centrifugal filter includes a bottom housing and a centrifugal sedimentation cylinder coaxially located inside the bottom housing. A rear outlet connected to the centrifugal pump is provided on the side of the bottom housing. A non-powered drive mechanism is also provided at the rear end of the centrifugal pump and is connected to the centrifugal sedimentation cylinder. The non-powered drive mechanism transmits power to the centrifugal impeller through the motor of the centrifugal pump.

2. The non-powered dual centrifugal pre-filter integrated with a centrifugal pump according to claim 1, characterized in that: The bottom of the filter cylinder has a bottom opening that communicates with the secondary centrifugal filter, and the top of the centrifugal sedimentation cylinder has a top opening that communicates with the primary centrifugal filter, wherein the diameter of the top opening is larger than the diameter of the bottom opening.

3. The non-powered dual centrifugal pre-filter integrated with a centrifugal pump according to claim 1, characterized in that: The centrifugal sedimentation cylinder is suspended entirely within the bottom casing, and its top, side, and bottom walls do not contact the bottom casing.

4. The non-powered dual centrifugal pre-filter integrated with a centrifugal pump according to claim 1, characterized in that: The bottom of the centrifugal sedimentation cylinder is coaxially provided with an annular sedimentation tank, and the height of the annular sedimentation tank is not higher than half of the total internal height of the centrifugal sedimentation cylinder.

5. The non-powered dual centrifugal pre-filter integrated with a centrifugal pump according to claim 4, characterized in that: The centrifugal sedimentation tank has multiple vertically extending centrifugal stirring blades arranged in a circumferential array on its inner wall, and all centrifugal stirring blades are located in the annular sedimentation tank.

6. The non-powered dual centrifugal pre-filter integrated with a centrifugal pump according to claim 1, characterized in that: The primary centrifugal filter and the secondary centrifugal filter are detachable; multiple evenly distributed vertical supports are fixed on the outer wall of the bottom housing, and a screw and a butterfly nut are installed at the top of each vertical support. The tightening or loosening of the top housing and the bottom housing is achieved by the tightness and loosening of the screw and the butterfly nut.

7. The non-powered dual centrifugal pre-filter integrated with a centrifugal pump according to claim 1, characterized in that: The non-powered drive mechanism includes a vertical bevel gear coaxially connected to the shaft of a dual-shaft motor next to the centrifugal pump, a transverse bevel gear meshing with the vertical bevel gear, a drive pulley coaxially connected to the bottom end of the transverse bevel gear, a driven pulley extending beyond the bottom housing coaxially connected to the bottom of the centrifugal sedimentation tank, and a belt connecting the drive pulley and the driven pulley.

8. The non-powered dual centrifugal pre-filter integrated with a centrifugal pump according to claim 7, characterized in that: The vertical bevel gear's shaft is further supported by a top bearing seat, and the horizontal bevel gear's shaft is further supported by a bottom bearing seat.

9. The non-powered dual centrifugal pre-filter integrated with a centrifugal pump according to claim 7, characterized in that: The diameter of the transverse bevel tooth is larger than the diameter of the vertical bevel tooth, and the diameter of the driven pulley is larger than the diameter of the driving pulley.

10. The non-powered dual centrifugal pre-filter integrated with a centrifugal pump according to claim 1, characterized in that: The primary centrifugal filter, secondary centrifugal filter, centrifugal pump, and non-powered drive mechanism are all mounted on the integrated skid. Parts of the primary centrifugal filter, secondary centrifugal filter, centrifugal pump, and non-powered drive mechanism are exposed on the top surface of the integrated skid, while the pulley drive part of the non-powered drive mechanism is hidden in the bottom groove of the integrated skid.

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