Sewage solid-water separation equipment with spiral pushing mechanism

Abstract

The invention discloses sewage solid-water separation equipment with a spiral pushing mechanism. The sewage solid-water separation equipment comprises a shell, a filter cartridge, a spiral pushing shaft and a driving mechanism, the shell is provided with a feed port, a slag discharge port and a liquid outlet, the filter cartridge is fixed in the shell and provided with filter holes, the spiral pushing shaft coaxially penetrates through the filter cartridge and is provided with spiral blades, a gap is reserved between the outer edge of each blade and the inner wall of the filter cartridge, and the driving mechanism is connected with the spiral pushing shaft to drive the spiral pushing shaft to rotate; the screw pitch of the spiral blade decreases progressively in the conveying direction, radial protruding stripes are arranged on the surface of the spiral blade, longitudinal flow guide ribs are arranged on the inner wall of the filter cartridge, the shell is provided with a washing ring pipe, a conical flaring slag discharging opening and a hollow spiral material pushing shaft, and a ventilation channel is formed in the shell. The material pushing smoothness and the anti-blocking performance of high-water-content or viscous sludge can be improved.

Description

Technical Field

[0001] This invention relates to the field of environmental protection equipment technology, and in particular to a wastewater solid-water separation device with a spiral feeding mechanism. Background Technology

[0002] Wastewater solid-liquid separation equipment is a key device used to separate solid impurities from liquids in wastewater. It is widely used in municipal wastewater treatment, industrial wastewater treatment, and environmental protection projects. This type of equipment typically achieves solid-liquid separation through physical interception, gravity settling, or mechanical extrusion to improve subsequent treatment efficiency and reduce environmental pollution load.

[0003] Common solid-water separation equipment includes bar screens, sedimentation tanks, centrifuges, and belt filter presses. Some of these devices employ a screw conveyor structure to assist in slag discharge, thereby improving continuous operation and automation. The screw conveyor mechanism uses rotational motion to push the trapped solid material axially to the discharge port, helping to maintain unobstructed flow in the filtration area.

[0004] However, in practical applications, existing wastewater solid-water separation equipment with spiral feeding mechanism has certain limitations in the way the spiral feeding structure and the filter components are matched. When processing sludge with high water content or high viscosity, problems such as increased feeding resistance, poor sludge discharge or local blockage are likely to occur, thus affecting the continuous and stable operation of the equipment and the separation efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a wastewater solid-water separation device with a spiral feeding mechanism, which solves the problems mentioned in the background art.

[0006] This invention is implemented as follows: a wastewater solid-water separation device with a spiral feeding mechanism, comprising a shell, a filter cylinder, a spiral feeding shaft, and a drive mechanism, wherein: The shell is a hollow cylindrical structure with a feed inlet at one end, a slag outlet at the other end, and a liquid outlet at the bottom. The filter cylinder is fixedly installed in the middle of the inner cavity of the shell. The cylinder wall of the filter cylinder has multiple through-holes for filtering out the liquid in the sewage and guiding it to the liquid outlet. The spiral pusher shaft is coaxially inserted inside the filter cylinder. The outer circumference of the spiral pusher shaft is provided with continuous spiral blades, and a small gap is left between the outer edge of the spiral blades and the inner wall of the filter cylinder. The drive mechanism is fixedly connected to the outside of the shell, and its output end is connected to one end of the spiral pusher shaft for driving the spiral pusher shaft to rotate.

[0007] Optionally, the pitch of the spiral blades gradually decreases along the material conveying direction, with the pitch near the slag discharge port being smaller than the pitch near the feed port, so as to gradually compress the sludge volume during material conveying, improve dewatering efficiency, and enhance pushing force.

[0008] Optionally, the surface of the spiral blade is provided with a number of raised stripes. The raised stripes extend radially along the spiral blade, and the height of the raised stripes gradually decreases from the root of the spiral blade to the edge, so as to apply a scraping effect to the sticky sludge adhering to the inner wall of the filter cylinder during rotation and prevent the filter holes from being blocked.

[0009] Optionally, the inner wall of the filter cylinder is provided with several longitudinal guide ribs. The guide ribs are arranged along the axial direction of the filter cylinder. The cross-section of the guide ribs is trapezoidal, with the narrow end facing the center of the filter cylinder and the wide end fixedly connected to the inner wall of the filter cylinder. The surface of the guide ribs is smooth and is used to guide the sludge to move along the axial direction, thereby reducing the frictional resistance between the spiral blades and the filter cylinder.

[0010] Optionally, a flushing ring pipe is provided inside the housing on the outside of the filter cylinder. The flushing ring pipe is arranged around the outer periphery of the filter cylinder and has multiple spray holes facing the outer wall of the filter cylinder. One end of the flushing ring pipe is connected to an external water source through a pipe for periodically backwashing the outer wall of the filter cylinder to remove solid impurities attached to the outside of the filter holes.

[0011] Optionally, the slag discharge port is provided with a conical flared section, the large end of which is connected to the shell and the small end serves as the final discharge port. The inner wall of the conical flared section is provided with a wear-resistant lining made of high-molecular composite material to resist the scouring and abrasion of high-moisture and high-viscosity sludge.

[0012] Optionally, the spiral pusher shaft is a hollow structure with an internal ventilation channel. One end of the ventilation channel is connected to an external air source through a rotary joint, and the other end extends to a position near the slag discharge port of the spiral pusher shaft. Several air outlets are provided at this position, and the air outlets penetrate the wall of the spiral pusher shaft. They are used to inject compressed air into the sludge during the slag discharge process to reduce the viscosity of the sludge and improve its fluidity.

[0013] Optionally, the drive mechanism includes a geared motor, a coupling, and a support bearing housing. The output shaft of the geared motor is connected to the screw pusher shaft through the coupling. The support bearing housing is fixedly installed on the outer wall of the housing to provide radial support for the distal end of the screw pusher shaft. The support bearing housing is provided with a sealing stuffing box to prevent sewage from seeping into the bearing.

[0014] Optionally, the top of the housing is provided with an observation window made of transparent pressure-resistant material, and a sealing ring is provided around the observation window for real-time observation of the sludge conveying status inside the housing and the operation of the filter cartridge.

[0015] Optionally, the liquid outlet is connected to a liquid collection chamber, and an inclined guide plate is provided inside the liquid collection chamber. The high end of the inclined guide plate is fixed to the bottom of the shell, and the low end faces the liquid outlet, which is used to concentrate and guide the filtered liquid to the liquid outlet to avoid the liquid from accumulating at the bottom of the shell.

[0016] The wastewater solid-water separation device with a spiral feeding mechanism provided by the present invention has the following beneficial effects: This equipment improves dewatering rate and enhances pushing force by designing the pitch of the spiral blades to gradually decrease along the conveying direction, causing the sludge to experience progressively increasing compression during propulsion. It is particularly suitable for treating sludge with high water content. Radial raised stripes on the surface of the spiral blades continuously scrape the inner wall of the filter cartridge during rotation, preventing sticky sludge from adhering and clogging the filter pores. Longitudinal guide ribs added to the inner wall of the filter cartridge not only provide support but also guide the sludge to move smoothly axially, reducing pushing resistance. A flushing ring pipe on the outer side of the casing allows for flushing of the filter cartridge during operating intervals. Backwashing is performed to maintain filter pore permeability; the sludge discharge port adopts a conical flared structure with a wear-resistant lining, which facilitates sludge discharge and extends the service life of the equipment; the air channel integrated inside the screw conveyor shaft allows compressed air to be injected during the sludge discharge stage, disrupting the internal structure of the sludge, significantly improving the fluidity of highly viscous sludge, and preventing clogging of the sludge discharge port; the overall structural layout is reasonable, and the various components work together to effectively solve the technical problems of difficult feeding, poor sludge discharge, and easy clogging in existing equipment when processing sludge under complex working conditions, ensuring continuous and stable operation and efficient solid-liquid separation performance of the equipment. (See attached diagram for details.) Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the internal structure of the present invention; Figure 3 This is a schematic diagram of the screw feeder shaft and filter cylinder mating structure according to an embodiment of this application; Figure 4 This is a partial structural diagram of the slag discharge port according to an embodiment of this application; Explanation of reference numerals in the attached figures: 1. Shell; 2. Feed inlet; 3. Slag outlet; 4. Liquid outlet; 5. Filter cylinder; 6. Filter holes; 7. Spiral pusher shaft; 8. Spiral blades; 9. Drive mechanism; 10. Pitch transition section; 11. Raised stripes; 12. Guide ribs; 13. Flushing ring pipe; 14. Spray nozzle; 15. Conical flared section; 16. Wear-resistant liner; 17. Ventilation channel; 18. Rotary joint; 19. Air outlet; 20. Gear motor; 21. Coupling; 22. Support bearing seat; 23. Observation window; 24. Liquid collection chamber; 25. Inclined guide plate. Detailed implementation method 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.

[0017] Please see Figures 1 to 4 This invention provides a wastewater solid-liquid separation device with a spiral feeding mechanism. This device is suitable for continuous solid-liquid separation of high-moisture or viscous sludge during wastewater treatment. The overall structure of the device includes a shell 1, a feed inlet 2, a slag discharge outlet 3, a liquid outlet 4, a filter cylinder 5, filter holes 6, a spiral feeding shaft 7, spiral blades 8, and a drive mechanism 9. These components are mechanically connected and spatially coordinated to form a complete solid-liquid separation and slag discharge system.

[0018] Reference Figure 1 and Figure 2 The shell 1 is a hollow cylindrical structure with its axis arranged horizontally. The left end of the shell 1 has an inlet 2 for introducing the wastewater-sludge mixture to be treated; the right end of the shell 1 has a slag outlet 3 for discharging the dewatered solid residue; and the bottom of the shell 1 has a liquid outlet 4 for collecting and discharging the liquid separated by the filter holes 6. A filter cylinder 5 is fixedly installed inside the shell 1, coaxially positioned in the middle of the inner cavity of the shell 1. An annular gap is left between its outer wall and the inner wall of the shell 1, forming a liquid collection channel that ultimately connects to the liquid outlet 4. Multiple through-holes 6 are evenly distributed on the wall of the filter cylinder 5, with the pore diameter set according to the size of the sludge particles to be treated, ensuring that the liquid passes smoothly while the solids are trapped inside the filter cylinder 5.

[0019] A spiral pusher shaft 7 passes through the central axis of the filter cylinder 5, with both ends extending to the outside of the housing 1. Continuous spiral blades 8 are welded to the outer periphery of the spiral pusher shaft 7. The spiral blades 8 extend axially along the spiral pusher shaft 7, maintaining a small gap of 0.5 mm to 2 mm between their outer edges and the inner wall of the filter cylinder 5. This gap ensures that the spiral pusher shaft 7 does not interfere with the filter cylinder 5 during rotation and effectively prevents large particles of impurities from getting stuck. The pitch of the spiral blades 8 gradually decreases along the material conveying direction (i.e., from the inlet 2 to the outlet 3), forming a pitch transition section 10. The pitch is larger near the inlet 2, facilitating rapid filling after the initial sludge entry; the pitch is smaller near the outlet 3, causing the sludge to be gradually compressed during the pushing process, reducing its volume and further squeezing out water, thereby improving dewatering efficiency and enhancing pushing force.

[0020] like Figure 3 As shown, the surface of the spiral blade 8 is provided with several raised stripes 11. The raised stripes 11 extend radially along the spiral blade 8, and their height gradually decreases from the root of the spiral blade 8 towards the edge. During the rotation of the spiral pusher shaft 7, the edges of the raised stripes 11 continuously contact the inner wall of the filter cylinder 5, exerting a scraping effect on the sticky sludge adhering to the filter holes 6, preventing the filter holes 6 from being blocked. The height variation design of the raised stripes 11 creates a gradient of scraping force from strong to weak on the inner wall of the filter cylinder 5 during one rotation, avoiding deformation or wear of the filter holes 6 due to local stress concentration.

[0021] The inner wall of the filter cylinder 5 is provided with several longitudinal guide ribs 12, arranged axially along the filter cylinder 5, with four to eight ribs evenly distributed around the circumference of the inner wall. The cross-section of the guide ribs 12 is trapezoidal, with the narrow end facing the center of the filter cylinder 5 and the wide end welded and fixed to the inner wall of the filter cylinder 5. The surface of the guide ribs 12 is polished to maintain a smooth surface. During the process of the spiral blades 8 pushing the sludge, the longitudinal guide ribs 12 play a role in guiding the sludge to move axially, reducing the accumulation and slippage of sludge in the circumferential direction, and at the same time reducing the frictional resistance between the spiral blades 8 and the filter cylinder 5, avoiding sludge coking and adhesion due to local friction overheating.

[0022] Inside the housing 1, outside the filter cylinder 5, is a flushing ring pipe 13. The flushing ring pipe 13 surrounds the outer circumference of the filter cylinder 5, and its two ends are fixed to the inner wall of the housing 1 by brackets. Multiple spray holes 14 are formed on the flushing ring pipe 13, facing the outer wall of the filter cylinder 5. The diameter of the spray holes is 1 mm to 3 mm, and the spray angle is perpendicular to the outer surface of the filter cylinder 5. One end of the flushing ring pipe 13 is connected to an external water source via a pipe. During equipment operation breaks or periodic maintenance, the water source is turned on, and water is sprayed at high speed through the spray holes 14 onto the outer wall of the filter cylinder 5 to backwash solid impurities adhering to the outside of the filter holes 6, restoring the permeability of the filter holes 6 and maintaining the long-term stable operation of the equipment.

[0023] Reference Figure 4 The slag discharge port 3 is equipped with a conical flared section 15. The larger end of the conical flared section 15 is welded to the right end of the shell 1, and the smaller end serves as the final discharge outlet. The inner wall of the conical flared section 15 is covered with a wear-resistant liner 16. The wear-resistant liner 16 is made of high molecular weight composite materials such as polyurethane or ultra-high molecular weight polyethylene, with a thickness of 3 mm to 8 mm, and is fixed by adhesive or mechanical pressing. The wear-resistant liner 16 has excellent anti-erosion and anti-adhesion properties, which can effectively resist the continuous erosion and friction of high-moisture and high-viscosity sludge during the slag discharge process, extending the service life of the slag discharge port 3.

[0024] The spiral pusher shaft 7 is a hollow structure with an internal ventilation channel 17 that runs axially through it. The left end of the ventilation channel 17 is connected to an external air source via a rotary joint 18, which is fixedly installed on the left side of the housing 1 and provides both sealing and rotation functions, ensuring a continuous and stable air supply during the rotation of the spiral pusher shaft 7. The right end of the ventilation channel 17 extends to the spiral pusher shaft 7 near the sludge discharge port 3, and several air outlets 19 are provided in this area. These outlets 19 penetrate the wall of the spiral pusher shaft 7, with a diameter of 0.5 mm to 2 mm, and are evenly distributed around the circumference of the spiral pusher shaft 7. During the sludge discharge stage, compressed air is injected into the sludge through the ventilation channel 17 and the air outlets 19, disrupting the sludge agglomeration structure, reducing its viscosity, improving its fluidity, and preventing the sludge discharge port 3 from being blocked by the accumulation of highly viscous sludge.

[0025] The drive mechanism 9 is fixedly connected to the left exterior of the housing 1 and includes a geared motor 20, a coupling 21, and a support bearing seat 22. The output shaft of the geared motor 20 is connected to the left end of the screw conveyor shaft 7 via the coupling 21. The coupling 21 adopts a flexible pin structure to compensate for minor axial and radial deviations. The support bearing seat 22 is fixedly installed on the right exterior of the housing 1 to provide radial support for the right end of the screw conveyor shaft 7. The support bearing seat 22 has a sealed stuffing box inside, which is filled with graphite packing or polytetrafluoroethylene sealing material to prevent sewage from inside the housing 1 from seeping into the bearing along the screw conveyor shaft 7, causing lubrication failure or corrosion.

[0026] The top of the housing 1 is equipped with an observation window 23, which is made of a high-strength, transparent, and pressure-resistant material such as tempered glass or polycarbonate, with a thickness of not less than 10 mm. A sealing ring is provided around the observation window 23, which is bolted to the top flange face of the housing 1 to ensure a tight seal. Operators can use the observation window 23 to monitor the sludge conveying status inside the housing 1, the operation of the spiral blades 8, and whether the filter cartridge 5 is clogged in real time, facilitating timely adjustments to operating parameters or scheduling maintenance.

[0027] The liquid outlet 4 is connected to a liquid collection chamber 24, which is located below the bottom of the housing 1 and is integrally formed or welded to the housing 1. An inclined guide plate 25 is provided inside the liquid collection chamber 24. The high end of the inclined guide plate 25 is fixed to the inner side of the bottom of the housing 1, and the low end faces the liquid outlet 4 at an angle of 15 to 30 degrees. The filtered liquid flows through the filter holes 6 into the annular gap between the housing 1 and the filter cylinder 5, then slides down the surface of the inclined guide plate 25 and is concentrated and guided to the liquid outlet 4, preventing liquid from accumulating at the bottom of the housing 1 to form a dead zone and preventing secondary pollution or microbial growth.

[0028] During equipment operation, the sewage-sludge mixture enters the filter cylinder 5 through the inlet 2. The spiral pusher shaft 7 rotates at a constant speed driven by the geared motor 20, and the spiral blades 8 push the sludge axially. In the initial stage of pushing, the spiral blades 8 with a larger pitch allow the sludge to be fully filled. As the sludge moves towards the discharge port 3, the pitch gradually decreasing section 10 gradually compresses the sludge volume, squeezing out water. The water enters the annular gap through the filter holes 6 and is then guided by the inclined guide plate 25 to the outlet port 4 for discharge. At the same time, the raised stripes 11 continuously scrape the inner wall of the filter cylinder 5, the longitudinal guide ribs 12 guide the sludge to flow smoothly axially, and the flushing ring pipe 13 starts backwashing within a set cycle to remove impurities from the outside of the filter holes 6. When approaching the discharge port 3, compressed air is injected into the sludge through the air passage 17 and the air outlet 19 to reduce its viscosity. Combined with the conical flared section 15 and the wear-resistant liner 16, smooth discharge of sludge is achieved.

[0029] This invention, through the synergistic cooperation of the aforementioned structures, achieves efficient solid-liquid separation and continuous sludge discharge for sludge with high water content and high viscosity, solving the technical problems of high pushing resistance, poor sludge discharge, and easy clogging of filter holes in traditional screw conveyor equipment under complex working conditions. All structural features are based on mechanical principles and fluid dynamics design, without relying on electronic control or complex sensing systems, ensuring the reliability and maintainability of the equipment under harsh working conditions.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wastewater solid-water separation device with a screw conveyor mechanism, characterized in that, The system includes a housing (1), a filter cylinder (5), a spiral pusher shaft (7), and a drive mechanism (9), wherein: the housing (1) is a hollow cylindrical structure with a feed inlet (2) at one end and a slag discharge outlet (3) at the other end, and a liquid outlet (4) at the bottom of the housing (1); the filter cylinder (5) is fixedly installed in the middle of the inner cavity of the housing (1), and the cylinder wall of the filter cylinder (5) has multiple filter holes (6); the spiral pusher shaft (7) is coaxially inserted inside the filter cylinder (5), and the outer circumference of the spiral pusher shaft (7) is provided with continuous spiral blades (8), and a small gap is left between the outer edge of the spiral blades (8) and the inner wall of the filter cylinder (5); the drive mechanism (9) is fixedly connected to the outside of the housing (1), and its output end is connected to one end of the spiral pusher shaft (7) for transmission.

2. The wastewater solid-water separation equipment with a screw conveyor mechanism according to claim 1, characterized in that: The pitch of the spiral blade (8) gradually decreases along the material conveying direction, and the pitch at the end near the slag discharge port (3) is smaller than the pitch at the end near the feed inlet (2).

3. The wastewater solid-water separation equipment with a screw conveyor mechanism according to claim 1, characterized in that: The surface of the spiral blade (8) is provided with a number of raised stripes (11), which extend radially along the spiral blade (8) and gradually decrease in height from the root of the spiral blade (8) to the edge.

4. The wastewater solid-water separation equipment with a screw conveyor mechanism according to claim 1, characterized in that: The filter cylinder (5) has several longitudinal guide ribs (12) on its inner wall. The guide ribs (12) are arranged along the axial direction of the filter cylinder (5), with a trapezoidal cross section. The narrow end faces the center of the filter cylinder (5), and the wide end is fixedly connected to the inner wall of the filter cylinder (5). The surface is smooth.

5. The wastewater solid-water separation equipment with a screw conveyor mechanism according to claim 1, characterized in that: The housing (1) is provided with a flushing ring pipe (13) located outside the filter cylinder (5). The flushing ring pipe (13) is arranged around the outer periphery of the filter cylinder (5). Multiple spray holes (14) facing the outer wall of the filter cylinder (5) are opened on the flushing ring pipe (13). One end of the flushing ring pipe (13) is connected to an external water source through a pipe.

6. The wastewater solid-water separation equipment with a screw conveyor mechanism according to claim 1, characterized in that: The slag discharge port (3) is provided with a conical flared section (15). The large end of the conical flared section (15) is connected to the shell (1), and the small end serves as the final discharge port. The inner wall of the conical flared section (15) is provided with a wear-resistant lining (16), which is made of polymer composite material.

7. The wastewater solid-water separation equipment with a screw conveyor mechanism according to claim 1, characterized in that: The spiral pusher shaft (7) is a hollow structure with an internal ventilation channel (17). One end of the ventilation channel (17) is connected to an external air source through a rotary joint (18), and the other end extends to a position near the slag discharge port (3) and has several air outlets (19). The air outlets (19) penetrate the wall of the spiral pusher shaft (7).

8. The wastewater solid-water separation equipment with a screw conveyor mechanism according to claim 1, characterized in that: The outlet (4) is connected to the collection chamber (24), and the collection chamber (24) is provided with an inclined guide plate (25). The high end of the inclined guide plate (25) is fixed to the bottom of the shell (1), and the low end faces the outlet (4).

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