Oil-water separation device suitable for oil field water treatment and treatment method thereof

Abstract

The invention belongs to the technical field of produced water treatment and purification, particularly relates to an oil-water separation device suitable for oil field water treatment and a treatment method of the oil-water separation device, and solves the problems that a filter element of a traditional device is easy to block, shutdown cleaning is needed, and the oil-water separation effect is poor. The separation mechanism comprises a wedge-shaped wire filter element used for filtering mineral impurities and an oil removal element used for separating oil and water, the descaling mechanism comprises a gas storage ring capable of moving along the filter element, a spray head on the gas storage ring can spray high-pressure gas to the filter element to enable the filter element to vibrate and descale, and the dirt which is shaken off can be scraped and conveyed to a dirt discharge pipe to be discharged by the dirt discharge mechanism. The driving structure drives the turbine to rotate through flowing of floating gas after descaling, then the gas storage ring is made to move through transmission, the pollution discharge mechanism is driven to act, the device can automatically complete online cleaning of the filter element and dirt collection and discharge while normal separation operation is conducted, and shutdown or extra power is not needed.

Description

Technical Field

[0001] This invention relates to the field of produced water treatment and purification technology, and in particular to an oil-water separation device and treatment method suitable for oilfield water treatment. Background Technology

[0002] During oilfield extraction, produced fluids typically contain large amounts of crude oil, water, and mineral impurities such as silt and rock fragments. Direct discharge or reinjection into the formation not only wastes crude oil resources and pollutes the environment but may also clog formation pores, affecting subsequent extraction operations. Therefore, oil-water separation is a core component of oilfield water treatment processes, and its separation effectiveness and treatment efficiency directly impact the economic and environmental sustainability of oilfield extraction.

[0003] Existing oil-water separation devices for oilfield water treatment mostly employ a combination of filter cartridge filtration and gravity sedimentation to achieve three-phase separation of oil, water, and solids. These devices still have the following problems during use: 1. Mineral impurities are prone to deposit on the surface of the filter element to form a scale layer, which reduces the flow area of ​​the filter element and increases the filtration resistance, thereby reducing the separation efficiency. In order to maintain the normal operation of the device, it is necessary to stop the machine regularly to disassemble the filter element for cleaning or replacement, which not only increases the labor maintenance cost, but also interrupts the water treatment process and affects the overall operation progress. 2. Some devices attempt to add an online descaling structure to flush the filter element with high-pressure water or gas. However, these structures mostly use a fixed nozzle design, which limits the flushing range and makes it difficult to thoroughly descale the entire filter element. In addition, the descaling process requires an additional drive device to move the nozzle, which increases the energy consumption and structural complexity of the equipment. At the same time, the dirt generated during descaling is prone to accumulate in the tank. If it cannot be discharged in time, it may re-adhere to the filter element or tank wall, affecting the descaling effect. 3. The existing equipment operates independently from other processes such as oil-water separation, descaling, and sewage discharge. The power sources for each process are set up separately, which leads to power waste. In addition, the filter element structure design is simple and lacks active anti-scaling capability. Mineral impurities and primary scale are easy to adhere and deposit on the inner wall of the filter element, further shortening the service life of the filter element and reducing the long-term stability of the equipment. Summary of the Invention

[0004] In environments with high mineral impurities in produced water, traditional filter cartridges are prone to clogging, leading to downtime for cleaning, increased costs, and production interruptions. Simultaneously, existing separation devices suffer from low energy efficiency and lack integrated anti-scaling capabilities. A wedge-shaped wire filter cartridge combined with an airfoil vibration mechanism was designed: the conical structure of the filter cartridge facilitates dirt sliding off, while the airfoil utilizes fluid Karman vortex streets to generate passive vibration, reducing the adhesion of initial scale. This enhances the filter cartridge's self-cleaning ability and extends its service life. Furthermore, the nozzle's impact vibration descaling mechanism, along with the rising gas driving the turbine-driven screw to move the air storage ring, achieves comprehensive cleaning.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An oil-water separation device suitable for oilfield water treatment includes a tank body. A fixed ring I and a fixed ring II are sequentially arranged along the axial direction inside the tank body, forming a separation chamber between the fixed ring I and the fixed ring II. One end of the tank body is provided with an inlet pipe communicating with the separation chamber. A wedge-shaped wire filter element is provided inside the separation chamber for filtering mineral impurities in the oilfield water. It also includes a descaling mechanism, which includes an air storage ring sleeved on the outside of the wedge wire filter element. The inner wall of the air storage ring is provided with multiple nozzles that spray towards the wedge wire filter element. The air storage ring is connected to a bellows through which high-pressure gas is introduced. The system includes a drive structure, which includes an exhaust pipe located at the top of the tank and a turbine inside the exhaust pipe. The high-pressure gas ejected from the nozzle descales the wedge-shaped wire filter element and floats upward, driving the turbine to rotate, which in turn drives the gas storage ring to reciprocate along the axis of the wedge-shaped wire filter element.

[0006] In one possible design, the cross-section of the wedge-shaped wire filter element is tapered, and its inner diameter gradually decreases in the direction toward the fixing ring II; It also includes a sewage discharge mechanism, which includes a sewage discharge pipe and an arc-shaped scraper. The sewage discharge pipe is located at the bottom of the tank and on the side of the fixed ring I away from the fixed ring II. The arc-shaped scraper is reciprocally positioned above the sewage discharge pipe. When the driving structure drives the gas storage ring to move back and forth, it simultaneously drives the arc-shaped scraper to swing back and forth, scraping the dirt that has fallen off the wedge-shaped wire filter element and slid down its inner inclined surface to the bottom of the tank into the sewage discharge pipe.

[0007] In one possible design, the separation chamber is further provided with a fixed plate, which is connected to the inner wall of the tank by multiple support rods. The wedge-shaped wire filter element is fixed between the fixed ring I and the fixed plate. The separation chamber is also provided with an oil removal element I and an oil removal element II. The oil removal element I is cylindrical and connected between the fixed plate and the fixed ring II. The fixed ring II is provided with a through hole communicating with the oil removal element I. The top of the tank is provided with an oil drain pipe, which is located on the side of the fixed ring II away from the fixed ring I. The oil removal element II is fixedly installed in the drain pipe at the bottom of the tank.

[0008] In one possible design, the descaling mechanism further includes a fixed slide rod and a reciprocating screw. The fixed slide rod is fixedly connected in parallel between the fixed ring I and the fixed disk, and the reciprocating screw is rotatably connected in parallel between the fixed ring I and the fixed disk. The top and bottom of the gas storage ring are provided with connecting blocks. The connecting block at the top is slidably engaged with the fixed slide rod, and the connecting block at the bottom is helically engaged with the reciprocating screw through a nut block. The driving structure drives the reciprocating screw to rotate, thereby causing the gas storage ring to reciprocate along the fixed slide rod.

[0009] In one possible design, the drive structure further includes a drive shaft, bevel gear I, and bevel gear II; the fixed disk has a transmission cavity, the drive shaft rotates within the fixed disk, and the top end of the drive shaft is fixedly connected to a turbine, the bottom end extends into the transmission cavity and is fixedly connected to bevel gear I, one end of the reciprocating lead screw extends into the transmission cavity and is fixedly connected to bevel gear II, and bevel gear II meshes with bevel gear I.

[0010] In one possible design, the exhaust pipe is provided with a conical tube II, the inner diameter of the top of the conical tube II is smaller than the inner diameter of the bottom, and its inner wall is provided with a spiral guide groove; the rising gas is accelerated and rotated when it flows through the conical tube II, so as to impact and drive the turbine to rotate.

[0011] In one possible design, the sewage discharge mechanism further includes a rotating disk, a pin, a vertical plate, a rotating shaft, and a swing arm; the reciprocating screw is fixedly connected to the rotating disk, the pin is eccentrically mounted on the rotating disk, the vertical plate is fixed to the side of the fixed ring I away from the fixed ring II, the rotating shaft is rotatably mounted on the vertical plate, the swing arm is fixed to the outer wall of the rotating shaft, and the swing arm is provided with a strip groove, the pin extends into the strip groove, converting the rotation of the rotating disk into the reciprocating swing of the swing arm around the rotating shaft, and the arc-shaped scraper is fixed to the bottom of the swing arm.

[0012] In one possible design, the end of the inlet pipe that extends into the tank is connected in sequence to a conical pipe I and a guide pipe. The inner diameter of the outlet of the conical pipe I is smaller than the inner diameter of the inlet. The inner wall of the guide pipe is provided with multiple spiral guide plates, so that the oilfield water forms a swirling flow and enters the wedge-shaped wire filter element.

[0013] In one possible design, the wedge-shaped wire filter element includes a wire mesh with multiple sets of conical rods on the inner wall of the wire mesh. Each set of conical rods has an airfoil at its top and bottom. The flowing oilfield water causes the airfoil to vibrate at a high frequency and transmits the vibration to the wire mesh.

[0014] A method for treating water in oil fields includes the following steps: S1. Liquid Inlet and Cyclone Filtration: Open the valve on the liquid inlet pipe. The oilfield water is accelerated by the conical pipe I and guided by the spiral guide plate in the liquid guide pipe to form a cyclone and enter the wedge wire filter element. Centrifugal force is used to throw mineral impurities toward the inner wall of the wire mesh. At the same time, the water flow impacts the airfoil plate, causing it to drive the wire mesh to vibrate and shake off the impurities. The oil-water mixture passes through the wire mesh filter and enters the separation chamber. S2, Multi-stage oil-water separation: The oil-water mixture entering the separation chamber flows towards the outlet. The water passes through the oil removal element II and is discharged through the drain pipe. The oil is blocked by the oil removal element II and adsorbed and aggregated by the oil removal element I. The formed oil enters the oil collection area through the through hole of the fixed ring II and is discharged through the oil drain pipe. S3. Pneumatic online descaling: Start the compressed air source and introduce high-pressure gas into the air storage ring through the bellows. Spray the gas through the nozzle onto the outer wall of the wedge wire filter element, causing the wire mesh to deform and blow off the attached dirt. The dirt falls along the inner wall into the bottom of the tank. S4. Energy Recovery and Drive: The descaling gas in step S3 floats up into the exhaust pipe, is accelerated by the conical tube II and guided to rotate by the spiral guide groove; the turbine drives the reciprocating screw to rotate through the transmission shaft, bevel gear I and bevel gear II, and the reciprocating screw drives the gas storage ring to move back and forth along the fixed slide bar through the connecting block, so as to perform full-coverage spray descaling of the wedge wire filter element. S5. Linked Sewage Discharge: In step S4, while the reciprocating screw rotates, it drives the rotating disk to rotate. Through the engagement of the pin shaft and the strip groove on the swing arm, the swing arm is driven to swing back and forth around the rotating shaft. The arc-shaped scraper at the bottom of the swing arm scrapes the dirt at the bottom of the tank to the sewage pipe for discharge.

[0015] Beneficial effects: In this invention, the combination of the inlet pipe, the conical pipe I and the spiral guide plate creates a high-speed vortex before the oilfield water enters the wedge wire filter element. Centrifugal force is used to initially separate mineral impurities, reducing the filtration load on the wedge wire filter element. The wedge wire filter element adopts a conical structure design, which, combined with the vibration effect generated by the airfoil plate, achieves passive self-cleaning of mineral impurities and initial scale, reduces the adhesion of scale to the inner wall of the filter element, extends the service life of the filter element, and eliminates the need for frequent disassembly and cleaning. In this invention, the separation mechanism is equipped with dual oil removal elements. Oil removal element I and oil removal element II are respectively made of oleophilic and hydrophobic materials and strongly hydrophilic and oleophobic materials. Combined with the effect of gravity and material properties, the oil-water mixture is separated three times, which improves the oil-water separation accuracy and ensures that the discharged oil and water meet the requirements of subsequent treatment or discharge. The cooperation between the fixed plate and the support rod provides stable support for the wedge wire filter element and oil removal element I, ensuring the stability of the position of each component during the separation process and avoiding structural displacement caused by water flow impact. In this invention, the descaling mechanism adopts a high-pressure gas injection combined with the reciprocating movement of the gas storage ring. The nozzle moves and sprays along the entire area of ​​the wedge-shaped wire filter element, eliminating any dead angles in descaling. It utilizes the deformation difference between the hard scale layer and the steel wire mesh to cause the scale layer to crack and peel off. Combined with the gas pore penetration effect, the descaling effect is good, and there is no need to stop the machine for disassembly, which does not affect the continuity of oil-water separation operation, reducing maintenance time and labor costs. The bellows cover can effectively protect the fixed slide bar and reciprocating screw, preventing impurities from entering and causing wear or blockage, and ensuring the long-term operational stability of the descaling mechanism. In this invention, the sewage discharge mechanism synchronously drives the rotating disk and the swing arm through a reciprocating screw. The arc-shaped scraper reciprocates to scrape away the dirt at the bottom of the tank. Combined with the conical structure of the wedge-shaped wire filter element, the dirt can move smoothly towards the sewage discharge pipe, avoiding the accumulation of dirt in the tank. The sliding cooperation between the pin shaft and the strip groove realizes the conversion of rotational motion into swinging motion. The structure is compact and has high transmission efficiency. No additional sewage discharge drive device is required, simplifying the equipment structure. In this invention, the drive structure uses the descaling waste gas as a power source. The gas flow rate and impact force are increased through the conical tube II and the spiral guide groove, which drives the turbine and the transmission shaft to rotate, thereby providing power for the movement of the gas storage ring and the operation of the sewage discharge mechanism. There is no need to equip additional drive equipment such as motors, realizing energy recovery and utilization, reducing equipment energy consumption and operating costs. The bevel gear meshing transmission is stable, ensuring that the reciprocating screw and the gas storage ring move at a uniform speed, improving the stability of descaling and sewage discharge operations. In this invention, the wire mesh of the wedge wire filter element adopts a V-shaped weaving structure with uniform filtration gaps, which can effectively intercept mineral impurities and ensure the flow efficiency of oil-water mixtures. The setting of the fixing rod enhances the structural strength of the wire mesh and avoids deformation caused by high-pressure gas impact. The L-shaped frame and conical rod provide stable support for the airfoil plate, ensuring the airfoil plate vibration effect and further enhancing the passive self-cleaning capability.

[0016] In this invention, the oil-water separation device achieves online physical descaling without the need for shutdown and disassembly, significantly extending the operating cycle of the equipment under high scaling conditions. The special structure of the wedge-shaped wire filter element and the design of the internal conical rods enable passive self-cleaning during operation, effectively preventing the adhesion of mineral impurities and nascent scale. At the same time, the oil removal element in the separation mechanism improves the oil-water separation effect, making water and oil separation more thorough. The overall device operates stably, improving the efficiency and continuity of oilfield water treatment and reducing maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of existing technology; Figure 2 A three-dimensional structural schematic diagram of an oil-water separation device suitable for oilfield water treatment provided by the present invention; Figure 3This is a cross-sectional structural schematic diagram of an oil-water separation device suitable for oilfield water treatment provided by the present invention; Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 A three-dimensional exploded cross-sectional view of the conical tube I, the liquid guide tube, and the spiral guide plate of an oil-water separation device suitable for oilfield water treatment provided by the present invention; Figure 6 A three-dimensional exploded structural diagram of the fixed ring I, wire mesh, and fixed disk of an oil-water separation device suitable for oilfield water treatment provided by the present invention; Figure 7 This is a three-dimensional exploded structural diagram of the gas storage ring, reciprocating screw, and fixed disk of an oil-water separation device suitable for oilfield water treatment provided by the present invention. Figure 8 A three-dimensional exploded view of the swing arm, rotating disk, and vertical plate of an oil-water separation device suitable for oilfield water treatment provided by the present invention; Figure 9 This is a three-dimensional cross-sectional view of the exhaust pipe of an oil-water separation device suitable for oilfield water treatment provided by the present invention. Figure 10 This is a three-dimensional structural schematic diagram of a conical tube II for an oil-water separation device suitable for oilfield water treatment provided by the present invention; Figure 11 This is a three-dimensional structural diagram of a conical rod and an airfoil plate of an oil-water separation device suitable for oilfield water treatment provided by the present invention.

[0018] In the diagram: 1. Tank body; 2. Inlet pipe; 3. Fixing ring I; 4. Fixing plate; 5. Support rod; 6. Wire mesh; 7. Fixing rod; 8. Oil removal element I; 9. Fixing ring II; 10. Through hole; 11. Sewage pipe; 12. Drain pipe; 13. Oil removal element II; 14. Oil drain pipe; 15. Fixing slide rod; 16. Reciprocating screw; 17. Connecting block; 18. Air storage ring; 19. Nozzle; 20. Corrugated pipe; 21. Bellows cover; 22. Vertical plate; 3. Rotating shaft; 24. Swing arm; 25. Strip groove; 26. Rotating disk; 27. Pin shaft; 28. Arc scraper; 29. ​​Conical tube I; 30. Liquid guide tube; 31. Spiral guide plate; 32. Exhaust pipe; 33. Support frame; 34. Drive shaft; 35. Conical tube II; 36. Spiral guide groove; 37. Turbine; 38. Transmission cavity; 39. Bevel gear I; 40. Bevel gear II; 41. L-shaped frame; 42. Conical rod; 43. Airfoil plate. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] In one embodiment: Refer to Figure 2 , Figure 3 and Figure 5 An oil-water separation device suitable for oilfield water treatment, relating to the field of produced water treatment and purification technology, mainly includes a horizontal cylindrical tank 1, made of corrosion-resistant metal material, with end caps at both ends. The axial direction of the tank 1 is defined as from left to right. Inside the tank 1, fixing rings I3 and II9 are sequentially fixed from left to right, both sealingly connected to the inner wall of the tank 1, forming a closed separation chamber. An inlet pipe 2 is fixedly connected to the end cap at the left end of the tank 1, used to inject the oilfield water to be treated into the tank 1. The axis of the inlet pipe 2 is perpendicular to the tank body. The axes of the pipes are parallel. One end of the inlet pipe 2 extending into the tank 1 is connected to a conical pipe I 29. The cross-section of the conical pipe I 29 is conical. The large-diameter end of the conical pipe I 29 is connected to the inlet pipe 2. The inner diameter of its small-diameter end is smaller than the inner diameter of the large-diameter end. This structure increases the flow velocity of the fluid when it passes through the conical pipe. A guide pipe 30 is fixedly connected to the small-diameter end of the conical pipe I 29. Multiple spiral guide plates 31 are fixed on the inner wall of the guide pipe 30. The spiral guide plates 31 are evenly distributed along the circumference of the guide pipe 30 and extend spirally along its axial direction. When oilfield water passes through the guide pipe 30, the spiral guide plates 31 force the fluid to rotate, changing the axial flow into a high-speed swirling flow.

[0021] Furthermore, referring to Figure 3 and Figure 6 The separation chamber is equipped with a separation mechanism to separate water, oil, and mineral impurities in the oilfield water. The separation mechanism includes a wedge wire filter element, an oil removal element I8, and an oil removal element II13. The cross-section of the wedge wire filter element is conical, and its shape is truncated cone-shaped. The inner diameter of the left end of the wedge wire filter element is larger, and the inner diameter of the right end is smaller. The wedge wire filter element is composed of an outer layer of steel wire mesh 6 and an inner layer of multiple fixing rods 7. The steel wire mesh 6 is a cylindrical structure woven from V-shaped cross-section stainless steel wire. Its gap size is determined according to the particle size of the solid particles to be intercepted. The multiple fixing rods 7 are evenly distributed along the circumference and axial direction of the steel wire mesh 6 and are fixedly welded to the inner wall of the steel wire mesh 6. The fixing rods 7 are rigid metal rods used to enhance the structural stability of the wedge wire filter element and prevent it from deforming during fluid pressure or cleaning.

[0022] Furthermore, referring to Figure 3 and Figure 6Inside the separation chamber, a fixed disk 4 is also fixed. The fixed disk 4 has a disc-shaped structure, and its outer edge is fixedly connected to the inner wall of the tank 1 by multiple radially distributed support rods 5. The number of support rods 5 is four to eight. The left end opening edge of the wedge wire filter element is sealed and fixedly connected to the right side of the fixed ring I3, and the right end opening edge of the wedge wire filter element is sealed and fixedly connected to the left side of the fixed disk 4. The wedge wire filter element, the fixed ring I3, and the fixed disk 4 together form a filtration chamber. The swirling oilfield water from the liquid guide pipe 30 first enters this filtration chamber. The oil removal element I8 is cylindrical with openings at both ends. The left end of the oil removal element I8 is sealed and fixedly connected to the right side of the fixed disk 4. The right end of 8 is sealed and fixedly connected to the left side of the fixed ring II 9. The material of the oil removal element I 8 is an oleophilic and hydrophobic interfacial active material. The oil removal element I 8 is composed of a cylindrical coalescing material woven from oleophilic modified polypropylene fibers. Its fiber surface can promote the coalescence and growth of dispersed oil droplets and flow along the fiber surface to the upper end. It has a good adsorption and coalescence effect on oil droplets, while it has a repulsive effect on water. A through hole 10 is provided in the center of the fixed ring II 9. The through hole 10 is connected to the internal cavity of the oil removal element I 8. At the top of the tank body 1, located on the right side of the fixed ring II 9, an oil drain pipe 14 is fixedly connected. The oil drain pipe 14 is connected to the inside of the tank body 1 and is used to drain the accumulated crude oil.

[0023] Furthermore, referring to Figure 3 , Figure 5 and Figure 6 At the bottom of tank 1, corresponding to the separation chamber, a drain pipe 12 is fixedly connected. The drain pipe 12 is connected to the separation chamber. At the port where the drain pipe 12 extends into the tank 1, an oil removal element II 13 is fixedly installed. The oil removal element II 13 is made of a strongly hydrophilic and oleophobic interfacial active material. The oil removal element II 13 is a fine filter element composed of hydrophilic modified ceramic or a metal mesh membrane coated with a superhydrophilic coating. Its micropores allow water molecules to pass through while trapping micron-sized oil droplets. It allows water molecules to pass through smoothly while trapping residual tiny oil droplets.

[0024] Specifically, oilfield water enters the guide pipe 30 through the inlet pipe 2 and the conical pipe. Under the action of the spiral guide plate 31, the oilfield water forms a high-speed swirling flow and enters the filtration chamber inside the wedge-shaped wire filter element. The centrifugal force generated by the swirling flow throws the denser mineral impurity particles in the water toward the inner wall of the wire mesh 6 of the wedge-shaped wire filter element. The particles are intercepted by the gaps in the wire mesh 6, achieving preliminary solid-liquid separation. The water after preliminary filtration continues to flow to the right. When the water flows past the airfoil plate 43 fixed on the conical rod 42, an alternating vortex is generated at the tail of the airfoil plate 43. This vortex shedding phenomenon causes the airfoil plate 43 to generate high-frequency micro-vibration. The vibration is transmitted to the entire wire mesh 6 through the conical rod 42 and the L-shaped frame 41, causing the wire mesh 6 to generate continuous slight vibration. This vibration prevents mineral impurities and nascent water from separating. The scale adheres firmly to the surface of the wire mesh 6, causing it to be shaken off at the beginning of deposition. The fluid filtered by the wedge wire filter element passes through the channels on the fixed plate 4 and the internal space of the oil removal element I8 in sequence. At the oil removal element I8, the oil droplets are adsorbed and agglomerated into large oil droplets. Due to the hydrophobicity of the oil removal element I8, the water flow is blocked. The agglomerated crude oil enters the oil collection chamber on the right side through the through hole 10 on the fixed ring II9, and is finally discharged through the top oil drain pipe 14. The tiny oil droplets that are not completely removed by the oil removal element I8 continue to move downward with the water flow. The oil removal element II13 at the inlet of the drain pipe 12 at the bottom of the tank 1 performs the final treatment of the water flow. The hydrophilic and oleophobic properties of the oil removal element II13 allow the water flow to be discharged smoothly through the drain pipe 12, while the remaining oil droplets are trapped above it.

[0025] Furthermore, referring to Figure 3 , Figure 4 and Figure 7The device also includes a descaling mechanism for removing accumulated dirt inside the wedge wire filter element. The descaling mechanism primarily uses high-pressure gas for physical cleaning. The descaling mechanism includes an air storage ring 18, which is slidably fitted around the outside of the wedge wire filter element. The inner diameter of the air storage ring 18 is slightly larger than the outer diameter of the right end of the wedge wire filter element. Multiple nozzles 19 are fixedly inserted through the inner wall of the air storage ring 18. The nozzles 19 are evenly distributed circumferentially along the air storage ring 18, with their nozzles angled towards the surface of the wire mesh 6 of the wedge wire filter element. A fixed sliding rod 15 is fixedly connected between the fixed ring 13 and the fixed disc 4, located above the wedge wire filter element. The axis of the filter element 5 is parallel to the axis of the tank body 1. Below the wedge-shaped wire filter element, a reciprocating screw 16 is rotatably connected between the fixed ring I3 and the fixed disc 4. The axis of the reciprocating screw 16 is also parallel to the axis of the tank body 1. The surface of the reciprocating screw 16 is machined with reciprocating thread grooves. A connecting block 17 is fixed at the top and bottom of the gas storage ring 18, respectively. The upper connecting block 17 has a sliding hole, which forms a sliding fit with the fixed slide rod 15 through the sliding hole. A nut block is fixedly embedded in the lower connecting block 17. The internal thread of the nut block matches the reciprocating thread of the reciprocating screw 16, so that the connecting block 17 and the reciprocating screw... 16 forms a threaded transmission connection. When the reciprocating screw 16 rotates, the air storage ring 18, guided by the fixed slide rod 15, reciprocates linearly along the axis of the wedge-shaped wire filter element. The side wall of the air storage ring 18 is provided with a gas interface, and a metal flange is welded to the gas interface. One end of the bellows 20 is sealed to the air storage ring 18 through flange bolts, and the other end is fixedly inserted through the tank 1 and sealed to the outlet of the external compressed air pump. An O-ring is provided at the connection to prevent gas leakage. The bellows 20 is made of flexible metal or polymer material to adapt to the reciprocating motion of the air storage ring 18. To protect the reciprocating screw 16 and the fixed slide rod 15 from contamination... To prevent corrosion, bellows covers 21 are fixedly connected to both sides of the two connecting blocks 17. The bellows covers 21 are made of soft rubber or polyurethane coated fabric and are in a stretchable pleated shape. The end of the bellows cover 21 away from the connecting block 17 is fixedly connected to the fixing ring I3 and the fixing plate 4 respectively, forming a sealed protective space. The bellows cover 21 is made of oil-resistant rubber material, and fluororubber sealing rings are set at the connection parts of its two ends with the connecting block 17, fixing ring I3 and fixing plate 4 for sealing. This device requires the reciprocating screw 16 to be injected with high-temperature grease every 30 days and the surface of the fixed slide rod 15 to be cleaned to prevent the accumulation of impurities that may cause transmission jamming.

[0026] Specifically, the external compressed air pump is started, and high-pressure gas is delivered to the air storage ring 18 through the bellows 20 and ejected at high speed from each nozzle 19, directly impacting the outer surface of the wire mesh 6 of the wedge wire filter element. The impact of the high-pressure gas produces two effects. First, the impact force of the gas causes the wire mesh 6 to undergo instantaneous elastic deformation. There is a difference in deformation between the hard scale layer attached to the surface of the wire mesh 6 and the wire mesh 6. This difference causes stress to be generated inside the scale layer. When the stress exceeds the bonding strength of the scale layer, the scale layer will crack brittlely and peel off from the surface of the wire mesh 6. Second, some of the high-speed gas penetrates the gaps of the wire mesh 6 and blows the pores from the inside, carrying out loose particles and oil.

[0027] Furthermore, referring to Figure 3 , Figure 4 , Figure 9 and Figure 10 The descaling mechanism relies on a drive structure for power, which converts the gas energy released during the cleaning process into mechanical energy. At the top of the tank 1, above the fixed plate 4, is a fixed exhaust pipe 32. The exhaust pipe 32 discharges the high-pressure gas injected during cleaning and rising to the top of the tank 1. Inside the fixed plate 4 is a sealed transmission chamber 38. A transmission shaft 34 is vertically rotatably mounted on the fixed plate 4. The upper end of the transmission shaft 34 extends upwards, passes through the bottom of the exhaust pipe 32, and extends into the exhaust pipe 32. The lower end of the transmission shaft 34 extends downwards into the transmission chamber 38. Inside the exhaust pipe 32, a support frame 33 is fixed. The upper end of the transmission shaft 34 is rotatably connected to the support frame 33 via a bearing. The support frame 33 is fixed inside the exhaust pipe 32. Above the support frame 33, inside the exhaust pipe 32... A tapered tube II 35 is fixedly installed on the wall. The cross-section of the tapered tube II 35 is tapered, and the inner diameter of its top opening is smaller than the inner diameter of its bottom opening. Multiple spiral guide grooves 36 are machined on the inner wall of the tapered tube II 35. The spiral guide grooves 36 spirally rise along the inner wall of the tapered tube II 35. At the upper end of the drive shaft 34, above the tapered tube II 35, a turbine 37 is fixedly installed. The blades of the turbine 37 are designed to be driven to rotate by the rising airflow. In the transmission cavity 38, a bevel gear I 39 is fixedly installed at the lower end of the drive shaft 34. The right end of the reciprocating screw 16 extends into the transmission cavity 38 through a sealed bearing, and a bevel gear II 40 is fixedly installed at this end. The bevel gear II 40 and the bevel gear I 39 mesh with each other to form a right-angle transmission pair. When the drive shaft 34 rotates, the meshing of this pair of bevel gears can drive the reciprocating screw 16 to rotate.

[0028] Specifically, after completing the cleaning process, the ejected gas rises within the tank 1 and is eventually discharged through the exhaust pipe 32 at the top. Upon entering the exhaust pipe 32, the gas first passes through the conical pipe II 35. Due to the small inner diameter of the top of the conical pipe II 35, the gas velocity increases as it flows through this section. As the gas flows through the spiral guide groove 36, it gains a rotational tangential velocity, forming a high-speed swirling flow that moves upwards. This high-speed swirling flow impacts the blades of the turbine 37 above, driving the turbine 37 to rotate. The turbine 37 then drives the drive shaft 34 to rotate, and the bevel gear I 39 at the bottom of the drive shaft 34 drives... The bevel gear II 40 that meshes with it rotates, thereby driving the reciprocating screw 16 to rotate. The rotation of the reciprocating screw 16 drives the air storage ring 18 to reciprocate linearly along the axis of the wedge wire filter element through the nut block and connecting block 17. This allows the spray area of ​​the nozzle 19 to cover the entire outer surface of the wedge wire filter element, achieving comprehensive cleaning. The conical structure of the wedge wire filter element makes its inner wall an inclined plane. Under the action of gravity, the dirt removed slides along this inclined plane to the left end with the larger inner diameter and finally falls into the sedimentation area at the bottom left of the tank 1.

[0029] Furthermore, referring to Figure 3 and Figure 8 The device also includes a sewage discharge mechanism to discharge the dirt removed from the wedge wire filter element during the descaling process from the tank 1. The sewage discharge mechanism includes a sewage discharge pipe 11 fixed to the bottom of the tank 1. The sewage discharge pipe 11 is located to the left of the fixing ring I3, that is, below the left end cap of the tank 1. A vertical plate 22 is fixedly installed on the left side of the fixing ring I3. A rotating shaft 23 is rotatably connected to one side of the vertical plate 22 via a bearing. The axis of the rotating shaft 23 is parallel to the radial direction of the tank 1. A swing arm 24 is fixedly sleeved on the rotating shaft 23. The swing arm 24 can swing together with the rotating shaft 23. A long strip groove 25 is opened on the swing arm 24. The length direction of the strip groove 25 is approximately the same as the length direction of the swing arm 24. The left end of the reciprocating screw 16 is sealed. The bearing rotates through the fixed ring I3 and extends to its left side. A rotating disk 26 is fixedly installed at the left end of the reciprocating screw 16. The disk surface of the rotating disk 26 is perpendicular to the axis of the reciprocating screw 16. On the side of the rotating disk 26 away from the reciprocating screw 16, a pin 27 is fixed off-center. The axis of the pin 27 is parallel to the axis of the reciprocating screw 16. The free end of the pin 27 extends into the slot 25 of the swing arm 24 and forms a sliding fit with the slot 25. An arc-shaped scraper 28 is fixedly connected to the bottom of the swing arm 24. The arc of the arc-shaped scraper 28 is adapted to the arc of the inner wall of the bottom of the tank 1. The bottom edge of the arc-shaped scraper 28 maintains sliding contact with the inner wall of the bottom of the tank 1. The arc-shaped scraper 28 is located in the area above the inlet of the sewage pipe 11.

[0030] Specifically, while the reciprocating screw 16 drives the gas storage ring 18 to rotate, its left end also drives the rotating disk 26 to rotate synchronously. The pin 27 on the rotating disk 26 then makes a circular motion. The pin 27 slides in the strip groove 25 of the swing arm 24, converting the circular motion into the reciprocating swing of the swing arm 24. The swing arm 24 drives the arc-shaped scraper 28 at the bottom to swing back and forth in the area at the left end of the bottom of the tank 1 with the rotating shaft 23 as the center. The arc-shaped scraper 28 scrapes the dirt deposited in this area toward the inlet of the drain pipe 11. When the drain valve is opened, the dirt is discharged from the tank 1.

[0031] In another embodiment: Refer to Figure 11 Multiple L-shaped frames 41 are fixed on the inner wall of the wire mesh 6. The L-shaped frames 41 are arranged at intervals along the axial and circumferential directions of the wire mesh 6. Every two adjacent L-shaped frames 41 form a group. A conical rod 42 is fixedly connected between the two L-shaped frames 41 in the same group. The diameter of the conical rod 42 gradually decreases along the direction of fluid flow. An airfoil 43 is fixed at the top and bottom of the conical rod 42 respectively. The airfoil 43 has a streamlined cross section and is made of elastic thin-walled stainless steel sheet or special polymer material. The tail of the airfoil 43 extends freely, and its length direction forms a certain angle with the direction of fluid flow.

[0032] The installation angle of the airfoil 43 can be finely adjusted by the L-shaped frame 41 (adjustment range 0-15°) to adapt to oilfield water with different flow rates. When the oilfield water flow rate is lower than the preset value, the water inlet flow rate can be adjusted by the valve on the inlet pipe 2 to ensure that the airfoil 43 generates a high-frequency vibration with sufficient amplitude to maintain the passive cleaning effect.

[0033] The surface of the airfoil 43 is coated with an oleophobic and anti-fouling coating (such as a polytetrafluoroethylene coating) to reduce the adhesion of oil and dirt and ensure its long-term vibration performance.

[0034] The tank 1 is equipped with a differential pressure sensor to monitor the pressure difference across the wedge wire filter element. The differential pressure sensor is connected to a controller, which is also electrically connected to the start / stop switch of the compressed air pump. When the differential pressure exceeds the set threshold, the controller automatically starts the compressed air pump to begin the descaling operation. When the differential pressure returns to the normal range or the preset descaling time is reached, the controller controls the compressed air pump to shut down.

[0035] This device is equipped with a PLC controller, which is electrically connected to the external compressed air pump, the valve on the liquid inlet pipe 2, the valve on the drain pipe 11, and the differential pressure sensor. The PLC controller has a preset program that can automatically trigger the descaling operation based on the differential pressure monitoring data of the wedge wire filter element, control the start and stop of the compressed air pump, the reciprocating stroke of the air storage ring, and the opening and closing sequence of the drain valve, so as to realize the coordinated operation of each component.

[0036] To ensure the long-term stable operation of this device, it is recommended to perform the following maintenance regularly: check and clean the drain pipe 11 to prevent blockage; regularly check whether the nozzle 19 is properly ventilated; clean or replace the oil removal element I8 and oil removal element II13 regularly according to the water quality; and regularly lubricate the sliding parts of the fixed slide rod 15 and the reciprocating screw 16.

[0037] A method for treating oilfield water: First, open the valve on the inlet pipe 2. Oilfield water is injected into the tank 1 through the inlet pipe 2. When it flows through the conical pipe I 29, the flow velocity increases due to the shrinkage of the cross-sectional area. Then, it is guided by the spiral guide plate 31 on the inner wall of the guide pipe 30, and becomes a high-speed swirling flow that is ejected along the guide pipe 30. The swirling oilfield water enters the wedge-shaped wire filter element. Under the action of centrifugal force, the denser mineral impurities are thrown towards the inner wall of the wire mesh 6. Some impurities cannot adhere due to the vibration of the airfoil plate 43 and fall directly to the bottom of the tank 1. The remaining impurities are intercepted by the wire mesh 6. The oil-water mixture passes through the filtration gap of the wire mesh 6 and enters the separation chamber. The oil-water mixture entering the separation chamber flows to the right. When it passes through the oil removal element II 13, the water passes through the oil removal element II 13 under the action of strong hydrophilic and oleophobic properties and is discharged through the drain pipe 12. Oil is blocked above the oil removal element II13, and the oil-water mixture continues to flow to the oil removal element I8. Under the action of oleophilic and hydrophobic properties, the oil is adsorbed on the inner wall of the oil removal element I8, gradually accumulating to form an oil film and moving to the right. It enters the right side area of ​​the fixed ring II9 through the through hole 10, and is then discharged through the oil drain pipe 14, completing the oil-water separation operation. As the running time increases, mineral impurities and scale will accumulate on the inner wall of the wire mesh 6, requiring the descaling operation to be started. The external compressed air pump is turned on, and the compressed gas is transported to the air storage ring 18 through the bellows 20, and then sprayed onto the outer wall of the wedge wire filter element through the nozzle 19. The high-pressure gas impact causes the wire mesh 6 to undergo slight deformation. The scale layer cracks and peels off due to the difference in deformation between the scale layer and the wire mesh 6. The output pressure of the compressed air pump (0.3-0.5) can be adjusted by the PLC controller according to the thickness of the scale layer.For particularly stubborn scale (8MPa), a special oilfield descaling agent can be sprayed onto the filter element surface before high-pressure gas injection to enhance the descaling effect. Simultaneously, the gas passes through the pores of the wire mesh 6, blowing off the accumulated dirt. Under the impact of the gas and gravity, the dirt moves to the left along the conical inner wall of the wedge-shaped wire filter element and falls to the bottom of the tank 1. During the descaling process, the sprayed compressed gas floats upward, enters the exhaust pipe 32, and flows through the conical pipe II 35. Because the inner diameter of the top of the conical pipe II 35 is reduced, the gas flow rate increases. The flow path is high, and under the action of the spiral guide groove 36, it rises in a spiral shape, impacting the blades of the turbine 37 and driving the turbine 37 to rotate. The turbine 37 drives the transmission shaft 34 to rotate. The transmission shaft 34 meshes with the bevel gear I 39 and bevel gear II 40 at the bottom end, driving the reciprocating screw 16 to rotate. The reciprocating screw 16 drives the lower connecting block 17 to move through the threaded transmission, thereby driving the air storage ring 18 to reciprocate along the axis of the fixed slide rod 15 and the reciprocating screw 16. The nozzle 19 moves synchronously to spray and descale the entire wedge wire filter element. When the lead screw 16 rotates, it synchronously drives the rotating disk 26 on the left end to rotate. The pin 27 on the rotating disk 26 slides in the slot 25 of the swing arm 24, driving the swing arm 24 to swing back and forth around the rotating shaft 23. The arc-shaped scraper 28 swings synchronously with the swing arm 24, scraping the dirt accumulated at the bottom of the tank 1 to the drain pipe 11. The valve on the drain pipe 11 is opened, and the dirt is discharged from the tank 1 through the drain pipe 11, completing the descaling and drainage operations. During the descaling operation, the device does not need to be stopped, and the oil-water separation operation can be carried out simultaneously. The process proceeds step by step to ensure continuity of the treatment flow. When the vibration amplitude of the airfoil 43 changes due to variations in the oilfield water flow velocity, it can still generate high-frequency vibrations through the Karman vortex street effect, continuously passively cleaning the wire mesh 6, reducing scale adhesion. The drive structure utilizes the waste gas generated during descaling for power, eliminating the need for additional energy consumption, achieving power recycling, and reducing operating costs. All mechanisms work collaboratively to complete the entire process of oil-water-solid three-phase separation, online descaling, and sewage discharge, maintaining the long-term stable operation of the unit.

[0038] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An oil-water separation device suitable for oilfield water treatment, comprising a tank body (1), characterized in that, The tank body (1) is sequentially provided with a fixed ring I (3) and a fixed ring II (9) in the axial direction, a separation cavity is formed between the fixed ring I (3) and the fixed ring II (9), and one end of the tank body (1) is provided with a liquid inlet pipe (2) communicated with the separation cavity; a wedge-shaped wire filter element is arranged in the separation cavity and used for filtering mineral impurities in oilfield water; Further comprising a descaling mechanism, the descaling mechanism comprises a gas storage ring (18) sleeved outside the wedge-shaped wire filter element, the inner wall of the gas storage ring (18) is provided with a plurality of nozzles (19) spraying towards the wedge-shaped wire filter element, and the gas storage ring (18) is connected with a bellows (20) through which high-pressure gas enters; And a driving structure, the driving structure comprises an exhaust pipe (32) arranged on the top of the tank body (1), and a turbine (37) is arranged in the exhaust pipe (32); the high-pressure gas sprayed by the nozzles (19) floats after descaling the wedge-shaped wire filter element, drives the turbine (37) to rotate, and further drives the gas storage ring (18) to reciprocate along the axis of the wedge-shaped wire filter element.

2. The oil-water separation device for treating oilfield water according to claim 1, characterized in that, The cross section of the wedge-shaped wire filter element is conical, and the inner diameter thereof gradually decreases in the direction towards the fixed ring II (9); Further comprising a blowdown mechanism, the blowdown mechanism comprises a blowdown pipe (11) and an arc-shaped scraper (28), the blowdown pipe (11) is arranged at the bottom of the tank body (1) and located on the side of the fixed ring I (3) away from the fixed ring II (9), and the arc-shaped scraper (28) is arranged above the blowdown pipe (11) and can reciprocate; when the driving structure drives the gas storage ring (18) to reciprocate, the arc-shaped scraper (28) is synchronously driven to reciprocate, and the dirt on the wedge-shaped wire filter element, which falls off and slides along the inner inclined surface to the bottom of the tank body (1), is scraped into the blowdown pipe (11).

3. The oil-water separation device for treating oilfield water according to claim 2, characterized in that, Further comprising a fixed disc (4) arranged in the separation cavity, the fixed disc (4) is connected with the inner wall of the tank body (1) through a plurality of supporting rods (5), the wedge-shaped wire filter element is fixed between the fixed ring I (3) and the fixed disc (4), and oil removal elements I (8) and II (13) are further arranged in the separation cavity, the oil removal element I (8) is in a cylindrical shape and connected between the fixed disc (4) and the fixed ring II (9), the fixed ring II (9) is provided with a through hole (10) communicated with the oil removal element I (8), the tank body (1) is provided with an oil outlet pipe (14) at the top, and the oil outlet pipe (14) is located on the side of the fixed ring II (9) away from the fixed ring I (3), and the oil removal element II (13) is fixedly arranged in a drain pipe (12) at the bottom of the tank body (1).

4. The oil-water separation device for treating oilfield water according to claim 3, characterized in that, The descaling mechanism further comprises a fixed slide rod (15) and a reciprocating wire rod (16), the fixed slide rod (15) is fixedly connected in parallel between the fixed ring I (3) and the fixed disc (4), the reciprocating wire rod (16) is rotatably connected in parallel between the fixed ring I (3) and the fixed disc (4), the top and bottom of the gas storage ring (18) are provided with connecting blocks (17), the connecting block (17) at the top is in sliding fit with the fixed slide rod (15), the connecting block (17) at the bottom is in screw transmission fit with the reciprocating wire rod (16) through a nut block, the driving structure drives the reciprocating wire rod (16) to rotate, so as to drive the gas storage ring (18) to reciprocate along the fixed slide rod (15).

5. The oil-water separation device for oilfield water treatment of claim 4, wherein, The driving structure further comprises a transmission shaft (34), a bevel gear I (39) and a bevel gear II (40); the fixed disc (4) is provided with a transmission cavity (38) therein, the transmission shaft (34) is rotatable in the fixed disc (4), the top end of the transmission shaft (34) is fixedly connected with a turbine (37), the bottom end of the transmission shaft (34) extends into the transmission cavity (38) and is fixedly connected with the bevel gear I (39), one end of the reciprocating wire rod (16) extends into the transmission cavity (38) and is fixedly connected with the bevel gear II (40), the bevel gear II (40) is in mesh with the bevel gear I (39).

6. The oil-water separation device for oilfield water treatment of claim 5, wherein, The exhaust pipe (32) is provided with a conical pipe II (35) therein, the top inner diameter of the conical pipe II (35) is smaller than the bottom inner diameter, and the inner wall of the conical pipe II (35) is provided with a spiral flow guide groove (36); when the gas floating up flows through the conical pipe II (35), the gas is accelerated and rotated, so as to impact and drive the turbine (37) to rotate.

7. The oil-water separation device for oilfield water treatment of claim 6, wherein, The blowdown mechanism further comprises a rotating disc (26), a pin shaft (27), a vertical plate (22), a rotating shaft (23) and a swing arm (24); the reciprocating wire rod (16) is fixedly connected with the rotating disc (26), the pin shaft (27) is eccentrically arranged on the rotating disc (26), the vertical plate (22) is fixed to the side of the fixed ring I (3) away from the fixed ring II (9), the rotating shaft (23) is rotatably arranged on the vertical plate (22), the swing arm (24) is fixed to the outer wall of the rotating shaft (23), and the swing arm (24) is provided with a strip-shaped groove (25), the pin shaft (27) extends into the strip-shaped groove (25), and the rotation of the rotating disc (26) is converted into the reciprocating swing of the swing arm (24) around the rotating shaft (23), and the arc-shaped scraper (28) is fixed to the bottom of the swing arm (24).

8. The oil-water separation device for oilfield water treatment of claim 7, wherein, The end of the liquid inlet pipe (2) extending into the tank (1) is connected with a conical pipe I (29) and a liquid guide pipe (30) in sequence, the outlet inner diameter of the conical pipe I (29) is smaller than the inlet inner diameter, and the inner wall of the liquid guide pipe (30) is provided with a plurality of spiral flow guide plates (31), so that the oilfield water forms a rotational flow to enter the wedge-shaped wire filter element.

9. The oil-water separation device for oilfield water treatment of claim 8, wherein, The wedge-shaped wire filter element comprises a steel wire mesh (6), the inner wall of the steel wire mesh (6) is provided with a plurality of groups of tapered rods (42), the top and bottom of each group of the tapered rods (42) are provided with airfoil plates (43); the flowing oilfield water makes the airfoil plates (43) produce high-frequency vibration and is conducted to the steel wire mesh (6).

10. A method for treating oilfield water, applied to the oil-water separation device for treating oilfield water according to claim 9, characterized in that, The method comprises the following steps: S1, opening the valve on the liquid inlet pipe (2), the oilfield water is accelerated through the tapered pipe I (29) and guided through the spiral guide plate (31) in the liquid guide pipe (30), and forms a cyclone into the wedge-shaped wire filter element; mineral impurities are thrown to the inner wall of the steel wire mesh (6) by using the centrifugal force, at the same time, the water flow impacts the airfoil plate (43) to make the airfoil plate (43) drive the steel wire mesh (6) to vibrate to shake off the impurities, and the oil-water mixture passes through the steel wire mesh (6) and is filtered into the separation cavity; S2, the oil-water mixture entering the separation cavity flows towards the outlet direction, and the water is discharged through the drain pipe (12) by passing through the oil removal element II (13); The oil is blocked by the oil removal element II (13) and is adsorbed and coalesced by the oil removal element I (8), and the formed oil liquid enters the oil collection area through the through hole (10) of the fixed ring II (9) and is discharged through the oil discharge pipe (14); S3, starting the compressed gas source, the high-pressure gas is introduced into the gas storage ring (18) through the corrugated pipe (20), and is sprayed to the outer wall of the wedge-shaped wire filter element through the nozzle (19), so that the steel wire mesh (6) is deformed and the attached dirt is blown off, and the dirt falls along the inner wall into the bottom of the tank (1); S4, the gas after the descaling in step S3 floats into the exhaust pipe (32), is accelerated through the tapered pipe II (35) and is guided to impact the turbine (37) through the spiral guide groove (36); the turbine (37) drives the reciprocating wire rod (16) to rotate through the transmission shaft (34), the bevel gear I (39) and the bevel gear II (40), and the reciprocating wire rod (16) drives the gas storage ring (18) to reciprocate along the fixed slide rod (15) through the connecting block (17), so that the wedge-shaped wire filter element is fully covered and sprayed for descaling; S5, while the reciprocating wire rod (16) rotates in step S4, the rotating disc (26) is rotated, the pin shaft (27) is matched with the strip-shaped groove (25) on the swing arm (24), the swing arm (24) is driven to reciprocate around the rotating shaft (23); the arc-shaped scraper (28) at the bottom of the swing arm (24) scrapes the dirt at the bottom of the tank (1) to the dirt discharge pipe (11) for discharge.

Images