Dosing device for oilfield sewage treatment

Abstract

The invention discloses a dosing device for oilfield sewage treatment, and relates to the technical field of sewage treatment. The oilfield sewage treatment dosing device comprises a placement frame and a mixing barrel mounted on the placement frame, and further comprises a barrel cover arranged at the upper end of the placement frame and internally provided with a medicine storage tank; and the hollow shaft is rotationally connected to the middle in the containing frame, an L-shaped pipe is installed on the outer side of the hollow shaft, a linear groove is formed in the outer side of the vertical portion of the L-shaped pipe, a sleeve is rotationally connected to the position, corresponding to the linear groove, of the outer side of the L-shaped pipe, and a spiral groove is formed in the sleeve. Through the mutual cooperation of the L-shaped pipe, the linear groove, the sleeve and the spiral groove, the intersection point of the spiral groove and the linear groove periodically changes up and down along with the rotation of the sleeve, so that a height-variable dynamic medicine outlet is formed, the spraying point of the medicine is circularly scanned in the vertical direction of the mixing barrel, the medicine can be diffused in different water layers in the initial stage of feeding, and the medicine feeding efficiency is improved. And the initial spatial distribution uniformity of the medicament in the sewage is greatly optimized.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a chemical dosing device for oilfield wastewater treatment. Background Technology

[0002] Oilfield wastewater presents a significant challenge to the industry due to its complex and variable composition and stringent treatment standards. Treatment sites are often located in remote and complex mountainous and hilly areas, facing constraints such as winding and narrow roads, rugged and bumpy conditions, and a lack of open working space for large hoisting equipment. This significantly hinders the transportation and on-site installation of traditional large-scale wastewater treatment equipment. To adapt to these special operating environments, skid-mounted designs are commonly used in the chemical dosing stage of oilfield wastewater treatment. The core preparation modes are mainly divided into single-skid single-tank and double-tank combined types. These devices integrate chemical dosing, mixing, liquid transportation, and automatic control into a complete set of equipment. They aim to optimize water quality control and purification in the wastewater treatment process. Their main function is to precisely add various chemical agents such as flocculants, disinfectants, and pH adjusters to wastewater to improve water quality, remove harmful substances, and increase water resource utilization.

[0003] Chinese invention patent application CN120364824B discloses a wastewater treatment device for chemical dosing. This device, through a chemical preparation chamber and a dosing mechanism, allows for the injection of clean water into the preparation chamber before wastewater treatment. Then, a ball bearing is rotated, causing the chemical flowing into the ball bearing groove to be discharged from the injection chamber and fall into the clean water under gravity. The high-concentration chemical and clean water are pre-mixed in the preparation chamber to prepare a low-concentration chemical solution. Because the preparation chamber contains clean water, there is no premature contact between the chemical and wastewater, preventing the formation of flocculent matter. Since the concentration of the chemical solution is lower than that of the chemical, the density difference between the two is reduced, thus avoiding uneven dispersion and mixing due to excessive concentration differences. The possibility of flocculent matter forming before stirring is further reduced.

[0004] However, when the above structure is in use, the dosing process relies on the water flow impacting the spherical impeller to drive the ball bearings to rotate and achieve the dripping of the agent. The agent injection point is relatively fixed and concentrated. This fixed-point dosing method means that when the diluted agent enters the large sewage treatment tank, the initial diffusion range is still limited and the concentration gradient still exists. It fails to optimize the contact and initial mixing effect between the agent and the sewage from the source. Therefore, it may still need to rely on strong mechanical stirring to achieve homogenization, which poses a risk of secondary shearing of the already formed flocs. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a chemical dosing device for oilfield wastewater treatment, which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an oilfield wastewater treatment dosing device, comprising a placement frame and a mixing tank mounted on the placement frame, and further comprising: The lid is located at the top of the shelf and contains a medicine storage trough. A hollow shaft is rotatably connected to the middle of the placement frame. An L-shaped tube is installed on its outer side. A straight groove is opened on the outer side of the vertical part of the L-shaped tube, and a sleeve is rotatably connected to the outer side of the L-shaped tube corresponding to the position of the straight groove. A spiral groove is provided on the sleeve. The lower end of the hollow shaft is connected to the output end of the drug storage tank through a quantitative siphon assembly, and the sleeve rotates to change the intersection point of the spiral groove and the straight groove.

[0007] Furthermore, the quantitative siphon assembly includes: A metering container is fixed to the upper outer side of the mixing tank, and a tube cover is fixed inside it. The lower end of the tube cover is open and does not contact the bottom of the metering container. A siphon tube is installed between the hollow shaft and the metering tank. The upper end of the siphon tube extends into the tube cover and is close to the top of the tube cover. The gap between the outer side of the siphon tube and the inner wall of the tube cover forms a siphon flow channel. A first solenoid valve is installed on the siphon tube, and a flow meter is also installed on the siphon tube. The second solenoid valve has its lower end connected to the top of the metering tank via a water inlet pipe, and a water outlet pipe connected to the medicine storage tank is installed on one side of the second solenoid valve. The reflux pipe connects the top of the inside of the drug storage tank to the top of the inside of the metering tank.

[0008] Furthermore, a protective cover connected to the water outlet pipe is fixed at the bottom of the medicine storage tank. The protective cover has filter holes on its side wall, and a rotating shaft is rotatably installed in the middle of the protective cover. A connecting plate is fixed symmetrically on the rotating shaft, and an arc plate is installed at the other end of the connecting plate. The two opposite arc plates are centrally symmetrical about the rotating shaft.

[0009] Furthermore, a top cover is fixed to the upper end of the bucket lid, and a reduction motor for driving the rotating shaft is installed on the upper end of the top cover, and a water inlet is also provided on the top cover.

[0010] Furthermore, the lower end of the rotating shaft extends into the mixing tank and is fixed with a first chuck; An adjusting shaft is slidably mounted on the upper end of the hollow shaft. A second chuck adapted to the first chuck is fixed on the upper end of the adjusting shaft, and a spring is installed between the top of the adjusting shaft and the upper end of the hollow shaft.

[0011] Furthermore, a guide slider is provided at the upper outer end of the hollow shaft, and a guide groove is provided inside the adjusting shaft that is slidably connected to the guide slider.

[0012] Furthermore, a small gear is fitted on the outside of the sleeve, and a rack that meshes with the small gear is provided inside the mixing barrel.

[0013] Furthermore, a stirring blade is fixed to the lower outer end of the hollow shaft.

[0014] Furthermore, a drain pipe is installed on the outside of the mixing tank near the lower end, and an overflow pipe is provided on the outside of the mixing tank below the metering tank, so that the liquid level in the mixing tank is always lower than the liquid level inside the metering tank.

[0015] Furthermore, the placement rack is equipped with fixing hoops for securing the mixing bucket, and a controller is also installed on the placement rack.

[0016] The present invention has the following beneficial effects: (1) The dosing device for oilfield wastewater treatment, through the cooperation of L-shaped pipe, straight groove and casing, and spiral groove, makes the intersection of spiral groove and straight groove change periodically up and down with the rotation of casing, thus forming a dynamic outlet with variable height. The spray point of the agent is scanned in a vertical direction along the mixing tank, so that the agent can diffuse in different water layers in the initial stage of addition, which greatly optimizes the initial spatial distribution uniformity of the agent in wastewater, effectively alleviates the problem of local rapid reaction and floc destruction caused by uneven initial mixing, and creates favorable conditions for subsequent low-intensity, protective stirring.

[0017] (2) The dosing device for oilfield wastewater treatment achieves high-precision automated quantitative control of the dosing process through a quantitative siphon assembly consisting of a quantitative tank, a pipe cover, a siphon pipe, and a first solenoid valve and a second solenoid valve. When the liquid level in the quantitative tank is higher than the top of the siphon pipe, a stable and self-driven agent delivery is automatically triggered. The discharge volume is determined by the volume of the quantitative tank and the siphon trigger point, and the repeatability is high. The interlock between the first solenoid valve and the second solenoid valve strictly distinguishes between the filling and discharging states. Combined with the return pipe, the liquid level is kept constant, ensuring the accuracy and reliability of each dosing amount, and significantly improving the stability of the wastewater treatment process and the controllability of the effluent quality.

[0018] (3) The dosing device for treating wastewater in the oilfield forms a floating power transmission connection through the cooperation of the first chuck at the lower end of the rotating shaft and the adjusting shaft and its second chuck that are slidably installed at the upper end of the hollow shaft, under the action of the spring force. The clamping force of the spring ensures reliable meshing and torque transmission between the chucks on the one hand, and facilitates the loading and unloading of the barrel cover on the other hand.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the mixing tank in this invention; Figure 3 This is a schematic diagram of the internal structure of the mixing tank in this invention; Figure 4 In this invention Figure 3 The main view; Figure 5 This is a schematic diagram of the quantitative siphon assembly in this invention; Figure 6 This is a schematic diagram of the internal structure of the adjusting shaft in this invention; Figure 7 This is a schematic diagram of the installation structure of the sleeve in this invention; Figure 8 This is a schematic diagram of the internal structure of the bucket lid in this invention; Figure 9 This is a schematic diagram of the internal structure of the protective cover in this invention; Figure 10 This is a schematic diagram of the installation structure of the arc-shaped plate in this invention; Figure 11 This is a schematic diagram of the placement rack in this invention.

[0021] In the diagram: 1. Placement rack; 2. Controller; 3. Mixing tank; 4. Fixing hoop; 5. Tank lid; 6. Top cover; 7. Water inlet; 8. Drain pipe; 9. Overflow pipe; 10. Gear motor; 11. Metering tank; 12. Siphon pipe; 13. First solenoid valve; 14. Second solenoid valve; 15. Rotating shaft; 16. First chuck; 17. Hollow shaft; 18. Adjusting shaft; 19. Second chuck; 20. Stirring blade; 21. L-shaped pipe; 22. Sleeve; 23. Pinion; 24. Rack; 25. Water inlet pipe; 26. Return pipe; 27. Water outlet pipe; 28. Pipe cover; 29. ​​Siphon channel; 30. Spiral groove; 31. Straight groove; 32. Drug storage tank; 33. Protective cover; 34. Filter hole; 35. Connecting plate; 36. Arc plate; 37. Spring. Detailed Implementation

[0022] 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.

[0023] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0024] The following is based on Figures 1-11 This invention describes a chemical dosing device for oilfield wastewater treatment provided in an embodiment of the invention.

[0025] Please refer to Figures 1-11 The present invention provides a technical solution: an oilfield wastewater treatment dosing device, including a placement frame 1 and a mixing tank 3 installed on the placement frame 1, and a tank cover 5, which is located on the upper end of the placement frame 1 and has a drug storage tank 32 inside the tank cover 5 for containing drugs.

[0026] However, existing oilfield wastewater treatment methods often employ a single-dosing quantitative dosing approach, where chemicals are added first and then mixed. Before the mixing begins, when the chemicals are not yet evenly dispersed, some areas react with substances in the wastewater. Subsequent high-speed mixing shears and breaks down these initially formed flocs, preventing effective sedimentation or separation, thus reducing treatment efficiency and posing a risk of secondary pollution. Therefore, the oilfield wastewater treatment dosing device provided by this invention also includes a hollow shaft 17, rotatably connected to the center of the placement frame 1. An L-shaped pipe 21 is installed on the outer side of the hollow shaft 17. A straight groove 31 is formed on the outer side of the vertical portion of the L-shaped pipe 21, with the outer side of the L-shaped pipe 21 corresponding to the position of the straight groove 31. A rotatable sleeve 22 is provided, and a spiral groove 30 is provided on the sleeve 22. The lower end of the hollow shaft 17 is connected to the output end of the storage tank 32 through a quantitative siphon assembly for quantitative addition of the agent. Preferably, the pitch of the spiral groove 30 is less than the length of the straight groove 31, and the spiral groove 30 has one spiral turn, so that the spiral groove 30 and the straight groove 31 always have an intersection point. When the sleeve 22 rotates, the spiral groove 30 rotates synchronously. At this time, the intersection point of the spiral groove 30 and the straight groove 31 changes accordingly, thereby adjusting the height position of the intersection point. This causes the height position of the agent discharged from the intersection point to change in the mixing tank 3, which is conducive to the mixing of the agent and the sewage, so as to reduce the subsequent stirring intensity of the mixing tank 3 without changing the mixing effect.

[0027] In this scheme, the straight groove 31 and the spiral groove 30 work together to form a variable height outlet. When the sleeve 22 rotates, the intersection of the straight groove 31 and the spiral groove 30 moves up and down periodically along the vertical part of the L-shaped pipe 21, so that the spray point of the agent is cyclically scanned in the vertical direction of the mixing tank 3. This periodically changing height allows the agent to diffuse in different water layers in the initial stage of introduction, and uses the turbulence of the sewage itself to initially mix, effectively avoiding rapid reaction and floc destruction caused by excessively high local concentration, laying the foundation for subsequent low-intensity uniform mixing.

[0028] like Figures 2-5 As shown, to achieve quantitative drug delivery, the quantitative siphon assembly provided in this embodiment includes a quantitative tank 11, a siphon tube 12, and a second solenoid valve 14. The quantitative tank 11 is fixed to the upper outer side of the mixing tank 3. It is made of transparent material and can have graduation lines on its outer side. A tube cover 28 is fixed inside the quantitative tank 11. The lower end of the tube cover 28 is open, and a balance hole can be provided at its upper outer side to balance the air pressure inside the quantitative tank 11 and the tube cover 28. The lower end of the tube cover 28 does not contact the bottom of the quantitative tank 11, allowing for drug flow. The siphon tube 12 is installed between the hollow shaft 17 and the quantitative tank 11, siphoning... The upper end of tube 12 extends into the tube cover 28 and is close to the top of the tube cover 28. The gap between the outer side of the siphon tube 12 and the inner wall of the tube cover 28 forms a siphon channel 29. When the height of the horizontal level of the medicine inside the metering tank 11 is greater than the height of the top of the siphon tube 12, the siphon effect is triggered, allowing the medicine inside the metering tank 11 to enter the siphon channel 29 from the opening structure at the lower end of the tube cover 28 and be discharged from the siphon tube 12. It should be noted that in order to ensure the normal operation of the siphon, the liquid level inside the metering tank 11 is always lower than the liquid level inside the metering tank 11. More precisely, the highest point of the L-shaped tube 21 is lower than the lowest point of the metering tank 11.

[0029] In addition, to improve the accuracy of drug dosing, a first solenoid valve 13 is installed on the siphon tube 12 provided in this embodiment, and a flow meter is also installed on the siphon tube 12. The output end of the second solenoid valve 14 is connected to the top of the metering tank 11 through the water inlet pipe 25, and the input end of the second solenoid valve 14 is connected to the water outlet pipe 27 connected to the drug storage tank 32. The return pipe 26 is connected between the top of the inside of the drug storage tank 32 and the top of the inside of the metering tank 11. On the one hand, when the metering tank 11 is not full of drug, it balances the air pressure between the metering tank 11 and the drug storage tank 32 to facilitate the input of drug into the metering tank 11. On the other hand, when the metering tank 11 is full of drug, the return pipe 26 can allow the drug in the metering tank 11 to flow back into the drug storage tank 32. In this solution, when no drug needs to be added into the mixing tank 3, the first solenoid valve... 13. Close the siphon pipe 12. If the reagent inside the metering tank 11 has not reached the point of triggering the siphon effect, the second solenoid valve 14 opens the outlet pipe 27, allowing the reagent inside the storage tank 32 to enter the inlet pipe 25 from the outlet pipe 27, further filling the metering tank 11 with reagent. When the metering tank 11 is full of reagent, the excess reagent can flow back to the storage tank 32 through the return pipe 26. When the mixing tank 3 needs to be filled with reagent, the first solenoid valve 13 opens and the second solenoid valve 14 closes to prevent the reagent inside the storage tank 32 from continuously being injected into the metering tank 11 when the reagent is output, thereby affecting the accuracy of the reagent metering. At this time, the reagent enters the siphon channel 29 from the opening structure at the lower end of the pipe cover 28 and is discharged from the siphon pipe 12. After the flow meter monitors that the reagent input amount has reached the standard, the first solenoid valve 13 closes and the second solenoid valve 14 opens.

[0030] The quantitative siphon assembly uses a preset volume of the quantitative tank 11 and a fixed height at the top of the siphon tube 12 as a trigger point to ensure that the volume of the discharged drug is constant each time the siphon effect occurs. The annular siphon channel 29 formed between the tube cover 28 and the siphon tube 12 guides the drug to form a continuous liquid column. Once the passage is opened, the liquid flows through the siphon channel 29 under the action of gravity and forms a negative pressure in the siphon channel 29, thereby continuously drawing the drug in the quantitative tank 11 until the liquid level drops to the lower opening of the tube cover 28, at which point the siphon is interrupted. Since the distance to the lower opening is short, the residual drug dosage is negligible relative to the delivered amount. This ensures a high degree of repeatability in the dosage and is unaffected by subsequent pipeline pressure fluctuations. In addition, the interlocking logic between the first solenoid valve 13 and the second solenoid valve 14 (when the first solenoid valve 13 is open, the second solenoid valve 14 is closed, and vice versa) strictly distinguishes between the filling and draining states of the metering tank 11, avoiding measurement errors caused by cross-flow. Furthermore, the return pipe 26 in this design not only balances the air pressure and ensures smooth filling, but also ensures that the liquid level in the metering tank 11 remains constant after each filling by forming an overflow, that is, the initial state of the siphon trigger condition (the top of the siphon pipe 12 is submerged below the liquid surface) remains consistent. The flow meter serves as the final safety verification and feedback device, further improving the accuracy and reliability of the dosage.

[0031] like Figures 8-10 As shown, to facilitate the input of the medicine from the storage tank 32 into the metering tank 11, a protective cover 33 connected to the water outlet pipe 27 is fixed to the bottom of the storage tank 32 in this embodiment. The side wall of the protective cover 33 is provided with filter holes 34 to prevent undissolved or precipitated medicine from entering and avoid subsequent pipeline blockage. A rotating shaft 15 is rotatably installed in the middle of the protective cover 33, and a connecting plate 35 is symmetrically fixed on the rotating shaft 15. An arc-shaped plate 36 is installed at the other end of the connecting plate 35. The two opposing arc-shaped plates 36 are centrally symmetrical about the rotating shaft 15. The rotation of the rotating shaft 15 causes the arc-shaped plates 36 to be connected to the connecting plate. The protective cover 35 catches the medicine entering the protective cover 33. Under the action of centrifugal force and the pushing action of the arc plate 36, the medicine is pressed towards the outlet pipe 27, thereby realizing the output of the medicine. The protective cover 33 forms a suction chamber. The filter hole 34 at the bottom can effectively intercept undissolved medicine particles or impurities and prevent pipeline blockage. During operation, when the rotating shaft 15 drives the arc plate 36 to rotate, the medicine entering the protective cover 33 is captured and accelerated by the arc plate 36. Under the action of centrifugal force, it is thrown towards the side wall of the protective cover 33, thereby forming a local high pressure near the outlet pipe 27, which forces the medicine into the delivery pipeline.

[0032] It should be noted that the central angle corresponding to the location of the filter hole 34 provided in this solution is smaller than the central angle corresponding to the arc plate 36.

[0033] like Figure 2 As shown, the top cover 6 is fixed to the upper end of the bucket cover 5 provided in this embodiment. A reduction motor 10 for driving the rotating shaft 15 to rotate is installed on the upper end of the top cover 6, and a water inlet 7 is also provided on the top cover 6 for input of medicine and cleaning water.

[0034] like Figure 3 , Figure 4 and Figure 6 As shown, to transmit the driving force of the rotating shaft 15 to the hollow shaft 17, the lower end of the rotating shaft 15 provided in this embodiment extends into the mixing tank 3 and is fixed with a first chuck 16. An adjusting shaft 18 is slidably mounted on the upper end of the hollow shaft 17. A second chuck 19 adapted to the first chuck 16 is fixed on the upper end of the adjusting shaft 18. A spring 37 is installed between the top end of the adjusting shaft 18 and the upper end of the hollow shaft 17. The spring 37 causes the adjusting shaft 18 to slide on the hollow shaft 17 and pushes the second chuck 19 to contact the first chuck 16. The engagement between the first chuck 16 and the second chuck 19 causes the rotating shaft 15 to rotate, which in turn drives the adjusting shaft 18 to rotate, further causing the hollow shaft 17 to rotate. Through the cooperation of the first chuck 16 at the lower end of the rotating shaft 15 and the adjusting shaft 18 and the second chuck 19 slidably mounted at the upper end of the hollow shaft 17, a floating power transmission connection is formed under the elastic force of the spring 37. The clamping force of the spring 37 ensures reliable meshing and torque transmission between the second chuck 19 and the first chuck 16, and facilitates the loading and unloading of the bucket lid 5.

[0035] like Figure 6 As shown, in order to avoid relative rotation between the adjusting shaft 18 and the hollow shaft 17, the upper outer side of the hollow shaft 17 provided in this embodiment is provided with a guide slider, and the inside of the adjusting shaft 18 is provided with a guide groove that is slidably connected to the guide slider. By utilizing the sliding connection between the guide groove and the guide slider, the adjusting shaft 18 can only slide in the axial direction of the hollow shaft 17, thus avoiding relative circumferential rotation between the two.

[0036] like Figure 6 and Figure 7 As shown, in order to achieve the rotation of the sleeve 22 and change the height position of the intersection point of the spiral groove 30 and the straight groove 31, a small gear 23 is provided on the outside of the sleeve 22 in this embodiment, and a rack 24 that meshes with the small gear 23 is provided in the mixing tank 3. When the hollow shaft 17 rotates, the L-shaped tube 21 revolves around the hollow shaft 17. When the sleeve 22 rotates to the position of the rack 24, the small gear 23 meshes with the rack 24, so that the small gear 23 drives the sleeve 22 to rotate, thereby causing the sleeve 22 to rotate around the L-shaped tube 21. Furthermore, the intersection point of the spiral groove 30 and the straight groove 31 changes accordingly, thereby adjusting the height position of the intersection point, so that the height position of the agent discharged from the intersection point changes in the mixing tank 3, which is beneficial to the mixing of the agent and the sewage.

[0037] It should be noted that the pinion 23 and rack 24 provided by the present invention are made of materials with high hardness, high rigidity, high wear resistance and corrosion resistance, such as polyoxymethylene resin, in order to avoid the service life of the pinion 23 and rack 24 being reduced due to sewage.

[0038] like Figure 3 , Figure 4 and Figure 6 As shown, in order to achieve a high degree of mixing between the agent and the wastewater, the lower outer end of the hollow shaft 17 provided in this embodiment is fixed with a stirring blade 20. The hollow shaft 17 drives the stirring blade 20 to rotate, so that the wastewater and agent inside the mixing tank 3 are mixed more evenly. Since the hollow shaft 17 is driven by the reduction motor 10, the speed of the stirring blade 20 is greatly reduced, avoiding the disintegration of flocs caused by high agitation.

[0039] like Figures 1-4 As shown, to facilitate the discharge of sewage from the mixing tank 3, a drain pipe 8 is installed on the outer side of the mixing tank 3 near the lower end in this embodiment, and a sewage inlet pipe is installed on one side of the mixing tank 3. It should be noted that, since there are many types of sewage dosing, more mixing tanks 3 can be connected in series on the placement rack 1, so that the drain pipe 8 on the upstream mixing tank 3 is connected to the sewage inlet pipe on the downstream mixing tank 3, thereby avoiding the reaction between the agents and affecting the sewage treatment effect.

[0040] To control the liquid level inside the mixing tank 3, an overflow pipe 9 is provided on the outside of the mixing tank 3 below the metering tank 11 in this embodiment, so that the liquid level inside the mixing tank 3 is always lower than the liquid level inside the metering tank 11, thereby ensuring the triggering of the siphon phenomenon.

[0041] When the liquid level in the mixing tank 3 rises to the height of the overflow pipe 9, the excess liquid automatically overflows through the overflow pipe 9, thereby maintaining a constant liquid level. This creates and maintains a necessary potential energy difference to ensure the stable triggering of the siphon effect and guarantees the stable and continuous operation of the siphon effect.

[0042] like Figure 1 As shown, to improve the fixing effect of the mixing tank 3, the oilfield wastewater treatment dosing device provided in this embodiment is equipped with a fixing hoop 4 for fixing the mixing tank 3 on the placement frame 1. To facilitate the control and monitoring of the geared motor 10, the first solenoid valve 13, the second solenoid valve 14 and the flow meter, the placement frame 1 provided in this embodiment is also equipped with a controller 2 for controlling the geared motor 10 and receiving feedback signals from the flow meter, thereby controlling the state of the first solenoid valve 13 and the second solenoid valve 14. The interlocking of the first solenoid valve 13 and the second solenoid valve 14 strictly distinguishes the filling and draining states of the metering tank 11. Combined with the return pipe 26 to maintain a constant liquid level, the accuracy and reliability of each dosing amount are ensured, which significantly improves the stability of the wastewater treatment process and the controllability of the effluent quality.

[0043] During use (operation), oilfield wastewater is fed into the mixing tank 3, and the reagent is added into the storage tank 32. The reduction motor 10 is started to make the rotating shaft 15 rotate slowly. The rotation of the rotating shaft 15 causes the arc plate 36 and the connecting plate 35 to hold the reagent entering the protective cover 33. Under the centrifugal force and the pushing action of the arc plate 36, the reagent is pressed towards the outlet pipe 27 and enters the metering tank 11 through the outlet pipe 27, the second solenoid valve 14, and the inlet pipe 25.

[0044] When no additional chemicals are needed inside the mixing tank 3, the first solenoid valve 13 closes the siphon pipe 12. If the amount of chemicals inside the metering tank 11 has not reached the point of triggering the siphon effect, the second solenoid valve 14 opens the outlet pipe 27, allowing the chemicals inside the storage tank 32 to enter the inlet pipe 25 from the outlet pipe 27, further filling the metering tank 11 with chemicals. When the metering tank 11 is full of chemicals, excess chemicals can flow back to the storage tank 32 through the return pipe 26. When additional chemicals are needed inside the mixing tank 3, the first solenoid valve 13 opens and the second solenoid valve 14 closes to prevent the chemicals inside the storage tank 32 from continuously being injected into the metering tank 11 during chemical output, thus affecting the accuracy of chemical measurement. At this time, the chemicals enter the siphon channel 29 from the opening structure at the lower end of the pipe cover 28 and are discharged through the siphon pipe 12. After the flow meter monitors that the amount of chemicals input has reached the standard, the first solenoid valve 13 closes and the second solenoid valve 14 opens.

[0045] The medicine discharged through the siphon tube 12 flows into the L-shaped tube 21 through the hollow shaft 17. At this time, due to the engagement between the first chuck 16 and the second chuck 19, the rotating shaft 15 rotates, driving the adjusting shaft 18 to rotate, which in turn causes the hollow shaft 17 to rotate, so that the stirring fan blade 20 and the L-shaped tube 21 rotate around the hollow shaft 17, achieving low-intensity uniform stirring inside the mixing tank 3.

[0046] When the sleeve 22 rotates to the position of the rack 24, the pinion 23 meshes with the rack 24, so that the pinion 23 drives the sleeve 22 to rotate. When the sleeve 22 rotates, the intersection point of the straight groove 31 and the spiral groove 30 moves up and down periodically along the vertical part of the L-shaped tube 21, so that the spray point of the agent is cyclically scanned in the vertical direction of the mixing tank 3. This periodically changing height of the agent allows the agent to diffuse in different water layers in the initial stage of the injection, and uses the turbulence of the sewage itself to initially mix, effectively avoiding rapid reaction and floc destruction caused by excessively high local concentration.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A dosing device for oilfield wastewater treatment, comprising a placement frame (1) and a mixing tank (3) mounted on the placement frame (1), characterized in that, Also includes: A barrel lid (5) is located on the upper end of the placement rack (1), and a medicine storage trough (32) is provided inside it. A hollow shaft (17) is rotatably connected to the middle of the placement frame (1), and an L-shaped tube (21) is installed on its outer side. A straight groove (31) is opened on the outer side of the vertical part of the L-shaped tube (21), and a sleeve (22) is rotatably connected to the outer side of the L-shaped tube (21) corresponding to the position of the straight groove (31). A spiral groove (30) is provided on the sleeve (22). The lower end of the hollow shaft (17) is connected to the output end of the drug storage tank (32) through a quantitative siphon assembly. The sleeve (22) rotates to change the intersection point of the spiral groove (30) and the straight groove (31).

2. The dosing device for oilfield wastewater treatment according to claim 1, characterized in that, The quantitative siphon component includes: A metering tank (11) is fixed to the upper outer side of the mixing tank (3), and a tube cover (28) is fixed inside it. The lower end of the tube cover (28) is an open structure, and the lower end of the tube cover (28) does not contact the bottom of the metering tank (11). A siphon tube (12) is installed between the hollow shaft (17) and the metering tank (11). The upper end of the siphon tube (12) extends into the tube cover (28) and is close to the top of the tube cover (28). The gap between the outer side of the siphon tube (12) and the inner wall of the tube cover (28) forms a siphon flow channel (29). A first solenoid valve (13) is installed on the siphon tube (12), and a flow meter is also installed on the siphon tube (12). The second solenoid valve (14) has its lower end connected to the top of the metering tank (11) via a water inlet pipe (25). A water outlet pipe (27) connected to the medicine storage tank (32) is installed on one side of the second solenoid valve (14). The return pipe (26) is connected to the top of the inside of the medicine storage tank (32) and the top of the inside of the metering tank (11).

3. The dosing device for oilfield wastewater treatment according to claim 2, characterized in that, The bottom of the medicine storage tank (32) is fixed with a protective cover (33) that communicates with the water outlet pipe (27). The side wall of the protective cover (33) is provided with filter holes (34), and a rotating shaft (15) is rotatably installed in the middle of the protective cover (33). A connecting plate (35) is fixed symmetrically on the rotating shaft (15). An arc plate (36) is installed at the other end of the connecting plate (35). The two opposite arc plates (36) are centrally symmetrical about the rotating shaft (15).

4. The dosing device for oilfield wastewater treatment according to claim 3, characterized in that, The top cover (6) is fixed to the upper end of the bucket cover (5). A geared motor (10) for driving the rotating shaft (15) to rotate is installed on the upper end of the top cover (6), and a water inlet (7) is also provided on the top cover (6).

5. The dosing device for oilfield wastewater treatment according to claim 4, characterized in that, The lower end of the rotating shaft (15) extends into the mixing tank (3) and is fixed with a first chuck (16). An adjusting shaft (18) is slidably mounted on the upper end of the hollow shaft (17). A second chuck (19) adapted to the first chuck (16) is fixed on the upper end of the adjusting shaft (18), and a spring (37) is installed between the top end of the adjusting shaft (18) and the upper end of the hollow shaft (17).

6. The dosing device for oilfield wastewater treatment according to claim 5, characterized in that, The hollow shaft (17) has a guide slider at the upper outer side, and the adjusting shaft (18) has a guide groove inside that is slidably connected to the guide slider.

7. The dosing device for oilfield wastewater treatment according to claim 6, characterized in that, A small gear (23) is fitted on the outside of the sleeve (22), and a rack (24) that meshes with the small gear (23) is provided inside the mixing barrel (3).

8. A chemical dosing device for oilfield wastewater treatment according to any one of claims 2-7, characterized in that, A stirring blade (20) is fixed to the lower outer side of the hollow shaft (17).

9. The dosing device for oilfield wastewater treatment according to claim 8, characterized in that, A drain pipe (8) is installed on the outside of the mixing tank (3) near the lower end, and an overflow pipe (9) is provided on the outside of the mixing tank (3) below the metering tank (11) so that the liquid level in the mixing tank (3) is always lower than the liquid level inside the metering tank (11).

10. The dosing device for oilfield wastewater treatment according to claim 9, characterized in that, The placement rack (1) is equipped with a fixing hoop (4) for fixing the mixing bucket (3), and the placement rack (1) is also equipped with a controller (2).

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