A drag-reducing efficiency-improving device for a gas extraction water ring vacuum pump

Abstract

The application relates to the technical field of coal mine gas extraction equipment, and discloses a drag reduction and efficiency improvement device for a gas extraction water ring vacuum pump, which comprises a circulating filtering and cooling device, a circulating mixing device, a circulating pump set and an electrical control centralized control box. Waste working water is driven by an inlet pump to enter a filter tank body, is mixed with flocculating liquid pumped by a quantitative pump, is intercepted by three-stage gradient filter screens under the action of gravity, and is cooled by a liquid accumulation area cooling coil to form clean water. The clean water is pressed into a mixing tank body by a relay pump, a multi-channel cyclone water distributor and an overhead mechanical stirring device intersect to form a cross shear zone, so that a drag reduction agent is quickly dispersed and dissolved, the fluid frictional resistance is reduced by high molecular chain stretching, the electrical control centralized control box adjusts the circulating pump operation frequency according to liquid level and pressure data to maintain constant balance of the flow of each pipeline, and a physical and electrical interlocking action is performed to cut off the power supply when the pipeline is overpressured or leaks. The application significantly reduces the shaft power consumption of the vacuum pump and improves the safety.

Description

Technical Field

[0001] This invention relates to the field of coal mine gas extraction equipment technology, specifically to a drag reduction and efficiency improvement device for a gas extraction water ring vacuum pump. Background Technology

[0002] In coal mine gas drainage operations, water ring vacuum pumps are the core drainage equipment. During operation, water ring vacuum pumps rely on the rotation of the impeller to drive the working water to form a liquid ring to compress and transport gas. However, existing gas drainage water ring vacuum pumps and their supporting circulation systems have the following main technical defects in actual operation: Separating impurities from wastewater is difficult, and filtration efficiency is low. During gas extraction, the working water inevitably mixes with a large amount of suspended coal dust, fine silt, and salt scale particles. Existing water circulation treatment systems mostly use simple gravity sedimentation or single-layer filtration methods, lacking a pretreatment mechanism for fine suspended solids, which easily penetrate the filter layer. This not only leads to poor physical separation but also causes impurities to accumulate inside the system, affecting the quality of the working fluid in the water ring vacuum pump.

[0003] Polymer agents disperse and dissolve slowly, resulting in high energy consumption during equipment operation. To reduce fluid resistance within the pump, polymer drag-reducing agents are typically added to the working water. Existing mixing devices generally employ unidirectional mechanical stirring or static mixing in pipelines. When polymer agents come into contact with the water medium, they are prone to localized agglomeration, making it difficult to disperse and completely dissolve them quickly. Because the agents cannot effectively stretch their long polymer chains to alter the microstructure of the fluid, the fluid shear friction resistance inside the water ring vacuum pump remains high, and a large amount of shaft power is consumed in overcoming fluid resistance, resulting in enormous energy consumption during equipment operation.

[0004] The system lacks dynamic balance control and has weak safety protection capabilities. The existing circulating supply system struggles to achieve automatic adjustment and dynamic balance of flow rates in various pipelines during wastewater recovery, clean water transport, and drag-reducing fluid injection. Furthermore, the existing equipment lacks real-time monitoring of pipeline pressure and hardware-level emergency intervention mechanisms. When the system experiences sudden pipeline overpressure or severe leakage, it cannot quickly implement physical electrical interlocks and cut off power, allowing the equipment to continue operating under abnormal conditions, posing significant safety hazards. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a drag-reducing and efficiency-enhancing device for a gas extraction water ring vacuum pump. This device solves the problems of difficult efficient filtration and separation of impurities in waste working water, slow dispersion and dissolution of polymer drag-reducing agents leading to high energy consumption, and the lack of automatic flow regulation and safety protection against abnormal power outages in existing gas extraction water ring vacuum pump systems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a drag reduction and efficiency improvement device for a gas extraction water ring vacuum pump, comprising: a circulating filtration and cooling device, a circulating mixing device, a circulating pump set, a level gauge, and an electrical control central control box for the gas extraction water ring vacuum pump. The circulating pump set includes an inlet circulating pump, a relay circulating pump, and an output circulating pump. The circulating filtration and cooling device is equipped with an inlet end and an outlet end. The circulating mixing device is equipped with an inlet end and an outlet end. The inlet circulating pump is connected to the inlet end of the circulating filtration and cooling device. The outlet end of the circulating filtration and cooling device is connected in series with the relay circulating pump and then connected to the inlet end of the circulating mixing device. The outlet end of the circulating mixing device is connected to the output circulating pump. The output circulating pump is connected to the inlet of the gas extraction water ring vacuum pump via a pipeline. The circulating filtration and cooling device includes a filter tank, a three-stage gravity gradient filter, and a cooling coil; the three-stage gravity gradient filter is fixed inside the filter tank; a liquid accumulation area is provided at the bottom of the filter tank, and the cooling coil is fixedly installed inside the liquid accumulation area; The circulating mixing device includes a mixing tank, a multi-channel cyclone distributor, and a top-mounted mechanical agitator; the multi-channel cyclone distributor is equipped with an inlet end, and the relay circulating pump is equipped with an outlet end; the multi-channel cyclone distributor is fixed to the upper side wall of the mixing tank, and the outlet end of the relay circulating pump is connected to the inlet end of the multi-channel cyclone distributor through a pipeline; the top-mounted mechanical agitator is installed on the top of the mixing tank. The electrical control central control box is electrically connected to the inlet circulating pump, the relay circulating pump, the output circulating pump, the top-mounted mechanical stirring device, and the level gauge.

[0007] Preferably, the three-stage gravity gradient filter screen includes, from top to bottom, a primary coarse filter screen, a secondary medium filter screen, and a tertiary fine filter screen; The primary coarse filter screen is configured with a certain mesh size, the secondary medium filter screen is configured with a certain mesh size, and the tertiary fine filter screen is configured with a certain mesh size; the mesh size of the primary coarse filter screen is larger than that of the secondary medium filter screen, the mesh size of the secondary medium filter screen is larger than that of the tertiary fine filter screen, and the primary coarse filter screen, the secondary medium filter screen, and the tertiary fine filter screen are all configured as a conical structure inclined towards the center; The conical structure of the primary coarse filter, the secondary medium filter, and the tertiary fine filter is fixedly connected to a slag discharge pipe on its lower middle side; the slag discharge pipe is equipped with a sewage discharge valve and an output end; the sewage discharge valve is installed on the slag discharge pipe; the filter tank is equipped with an outer wall and an outer side; the output end of the slag discharge pipe passes through the outer wall of the filter tank and is fixed to the outer side of the filter tank.

[0008] Preferably, the circulating filtration and cooling device further includes a flocculation reflux branch; The flocculation reflux branch is equipped with an inlet end, an outlet end, and a pipeline; the inlet end of the flocculation reflux branch is connected to the outlet end of the circulating mixing device, and the outlet end of the flocculation reflux branch extends into the interior of the filter tank and is located above the primary coarse filter screen. A metering pump is installed on the pipeline of the flocculation return branch. The metering pump is electrically connected to the electrical control central control box. The electrical control central control box is configured to output flow control commands to the metering pump.

[0009] Preferably, the filter tank is provided with an inner wall and a side wall, and the cooling coil is provided with a liquid inlet and a liquid outlet. The cooling coil is in the shape of a multi-turn spiral, and the liquid inlet and outlet of the cooling coil protrude through the side wall of the filter tank for connecting to the circulation pipeline of the external refrigeration unit.

[0010] Preferably, the multi-channel vortex water distributor is configured with a lower side and multiple injection ports. The lower side of the multi-channel vortex water distributor has multiple injection ports at different angles, and the multiple injection ports included in the multi-channel vortex water distributor are arranged alternately in sequence. The top-mounted mechanical stirring device includes a stirring motor and a stirring impeller, and the stirring motor drives the stirring impeller to rotate. The interior of the mixing tank is also equipped with cooling coils arranged in a multi-turn spiral pattern.

[0011] Preferably, the electrical control central control box is configured to control the rotation direction of the top-mounted mechanical stirring device, so that the rotation direction of the mechanical stirring flow field generated by the operation of the top-mounted mechanical stirring device intersects the rotation direction of the rotating hydrodynamic flow field generated by the multi-channel vortex water distributor at a preset angle, forming a cross-shear zone inside the mixing tank.

[0012] Preferably, the electrical control central control box is configured to output frequency control signals to the relay circulating pump and the top-mounted mechanical stirring device; The electrical control central control box adjusts the water supply flow rate of the relay circulation pump to change the average water flow velocity of the multiple injection nozzles, and adjusts the rotation speed of the top-mounted mechanical agitator to change the linear velocity of the outer edge of the agitator impeller, thereby adjusting the fluid mixing state inside the cross-shear zone.

[0013] Preferably, both the filter tank and the mixing tank are provided with outer side walls, and the level gauge is fixed to the outer side wall of the filter tank and the outer side wall of the mixing tank. The electrical control central control box has a liquid level safety range set inside. The liquid level gauge collects the liquid level height inside the filter tank and the liquid level height inside the mixing tank to generate liquid level height data, and outputs the liquid level height data to the electrical control central control box. The electrical control central control box calculates the difference between the liquid level height data and the liquid level safety range and outputs control commands to adjust the operating frequency of the inlet circulation pump, the relay circulation pump and the output circulation pump.

[0014] Preferably, the device also includes a pipeline pressure sensor and a pipeline electric valve; The output circulation pump is equipped with an inlet pipe, and the relay circulation pump is equipped with an inlet pipe; the pipe pressure sensor is installed on the inlet pipe of the output circulation pump, and the pipe electric valve is installed on the inlet pipe of the relay circulation pump. The electrical control central control box establishes electrical connections with the pipeline pressure sensor and the pipeline electric valve respectively; the pipeline pressure sensor detects the fluid pressure inside the pipeline and outputs pressure data to the electrical control central control box.

[0015] Preferably, the electrical control central control box is equipped with an outer panel, and the outer panel of the electrical control central control box is equipped with an emergency stop button; The electrical control central control box is equipped with a pressure safety threshold and a relay group. When the pressure data deviates from the pressure safety threshold, or when the emergency stop button is pressed to generate a circuit breaker signal, the relay group disconnects and cuts off the power supply lines of the inlet circulation pump, the relay circulation pump, the output circulation pump, and the top-mounted mechanical stirring device.

[0016] Working principle: After the device is started, the waste working water discharged by the gas extraction water ring vacuum pump is pumped into the filter tank of the circulating filtration and cooling device through the inlet pipe interface under the power of the inlet circulating pump. At the same time as the water is entering, the metering pump on the flocculation return branch draws part of the prepared drag-reducing working fluid according to the set flow rate and guides it into the filter tank. The drag-reducing working fluid mixes with the waste working water at the top of the filter tank. The drag-reducing agent contained therein can change the surface potential of the suspended coal dust in the waste working water, causing the suspended coal dust to aggregate into flocs.

[0017] Subsequently, the wastewater flows downwards under gravity through a three-stage gravity gradient filter. The first-stage coarse filter first traps large particulate impurities and flocculated aggregates generated in the previous stage. Then, the wastewater passes through the second-stage medium filter and the third-stage fine filter, where fine silt and scale particles are further trapped. Finally, after physical separation, clean water is formed and flows into and collects in the liquid accumulation area at the bottom of the filter tank.

[0018] The clean water medium collected inside the liquid accumulation area will wrap around the cooling coil submerged in it. The external refrigeration unit will introduce refrigerant into the cooling coil. The clean water medium in the liquid accumulation area will come into contact with the wall of the cooling coil and exchange heat. The refrigerant will absorb the heat contained in the clean water medium, causing the temperature of the clean water medium to drop to within the set threshold range, restoring the water temperature conditions required for the water ring vacuum pump to work.

[0019] The cooled clean water medium is drawn from the bottom of the liquid accumulation area by a relay circulation pump and pressurized into the multi-channel vortex distributor of the circulating mixing device. The clean water medium is ejected from multiple staggered spray nozzles in the multi-channel vortex distributor, forming a bottom-up rotating hydrodynamic flow field inside the mixing tank. At the same time, the dosing mechanism injects drag-reducing agents into the internal space of the mixing tank. The stirring motor of the top-mounted mechanical stirring device drives the stirring impeller to rotate, generating a top-down mechanical stirring flow field. The mechanical stirring flow field and the rotating hydrodynamic flow field intersect in the middle area of ​​the mixing tank, forming a cross-shear zone. The electrical control central control box adjusts the rotation speed and water supply flow rate to maintain the effective mixing Reynolds number in the cross-shear zone within the set value range. The drag-reducing agent disperses and dissolves rapidly in the clean water medium in this area, completing the preparation of the drag-reducing working solution.

[0020] This invention provides a drag reduction and efficiency improvement device for a gas extraction water ring vacuum pump. It has the following beneficial effects: 1. This invention can effectively improve the filtration and impurity removal effect of wastewater. The drag-reducing working fluid mixes with the wastewater at the top of the filter tank. The drag-reducing agent contained in the working fluid changes the surface potential of suspended coal dust in the wastewater, causing the suspended coal dust to aggregate into flocs. Subsequently, the wastewater flows through a primary coarse filter, a secondary medium filter, and a tertiary fine filter under the action of gravity. The primary coarse filter traps large particulate impurities and flocs in the wastewater, while the secondary medium filter and the tertiary fine filter trap fine silt and scale particles in the wastewater, thus achieving efficient physical separation.

[0021] 2. This invention can accelerate the dissolution of the agent and significantly reduce the energy consumption of the vacuum pump. During the mixing process, the mechanical stirring flow field generated by the top-mounted mechanical stirring device and the rotating hydrodynamic flow field generated by the multi-channel vortex water distributor intersect in the middle region of the mixing tank. The mechanical stirring flow field and the rotating hydrodynamic flow field intersect to form a cross-shear zone. The drag-reducing agent is dispersed and dissolved in the clean water medium inside the cross-shear zone. After the preparation is completed, because the drag-reducing agent contained in the drag-reducing working fluid has a long polymer chain, the stretching of the long polymer chain changes the microfluid structure of the drag-reducing working fluid. Ultimately, the frictional resistance generated by the drag-reducing working fluid flowing inside the gas extraction water ring vacuum pump is reduced, and the shaft power consumed by the gas extraction water ring vacuum pump to overcome the fluid resistance is reduced.

[0022] 3. This invention possesses stable automatic flow regulation function and system safety protection capability. In terms of system control, the electrical control central control box receives liquid level and pressure data, and adjusts the operating frequency of the inlet circulation pump, relay circulation pump, and output circulation pump through output commands. The delivery flow rates of waste working water, clean water medium, and drag-reducing working fluid are kept constant. When the pressure data deviates from the pressure safety threshold set by the system, it indicates that the system has experienced pipeline overpressure or serious leakage. At this time, the electrical control central control box performs a physical electrical interlock action, cuts off the power supply line, and stops the physical circulation operation of the entire device, ensuring the safety of the equipment during operation. Attached Figure Description

[0023] Figure 1 This is a perspective view of the present invention; Figure 2 This is a rear perspective view of the present invention; Figure 3 This is a schematic cross-sectional view of the filter tank of the present invention; Figure 4 This is a schematic cross-sectional view of the mixing tank of the present invention; Figure 5 This is a schematic diagram of the multi-channel vortex water distributor of the present invention; Figure 6 This is a schematic cross-sectional view of the secondary filter screen of the present invention.

[0024] Among them, 10. Circulating filtration and cooling device; 11. Three-stage gravity gradient filter screen; 12. Cooling coil; 13. Filter tank; 14. Flocculation return branch; 15. Liquid accumulation area; 20. Circulating mixing device; 21. Multi-channel cyclone water distributor; 22. Top-mounted mechanical stirring device; 23. Mixing tank; 30. Circulating pump set; 31. Inlet circulating pump; 32. Relay circulating pump; 33. Output circulating pump; 40. Liquid level gauge; 41. Pipeline pressure sensor; 42. Pipeline electric valve; 50. Electrical control central control box; 51. Emergency stop button; 111. Primary coarse filter screen; 112. Secondary medium filter screen; 113. Tertiary fine filter screen; 114. Slag discharge pipe; 115. Sewage discharge valve; 221. Stirring motor; 222. Stirring impeller. Detailed Implementation

[0025] The technical solutions in 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.

[0026] Example: Please see the appendix Figure 1 - Appendix Figure 6 This invention provides a drag reduction and efficiency improvement device for a gas extraction water ring vacuum pump, comprising: a circulating filtration and cooling device 10, a circulating mixing device 20, a circulating pump set 30, a level gauge 40, and an electrical control central control box 50. The drain outlet of the gas extraction water ring vacuum pump is connected to the inlet circulating pump 31 in the circulating pump set 30 via a pipeline. The inlet circulating pump 31 is connected to the inlet end of the circulating filtration and cooling device 10. The outlet end of the circulating filtration and cooling device 10 is connected in series with the relay circulating pump 32 in the circulating pump set 30 and then connected to the inlet end of the circulating mixing device 20. The outlet end of the circulating mixing device 20 is connected to the output circulating pump 33 in the circulating pump set 30. The output circulating pump 33 is connected to the inlet of the gas extraction water ring vacuum pump via a pipeline. The electrical control central control box 50... The control box 50 is electrically connected to the inlet circulating pump 31, the relay circulating pump 32, the output circulating pump 33, the circulating mixing device 20, and the level gauge 40. Waste working water passes through a three-stage gravity gradient filter 11 installed inside the circulating filtration and cooling device 10 under gravity. The three-stage gravity gradient filter 11 removes solid impurities from the waste working water. The water passing through the three-stage gravity gradient filter 11 collects in the lower liquid accumulation area 15 of the circulating filtration and cooling device 10. A cooling coil 12, preferably a 10-turn copper cooling coil, is installed in the lower liquid accumulation area 15 of the circulating filtration and cooling device 10. A refrigerant supplied by an external refrigeration unit is introduced into the cooling coil 12. The water collected in the lower part of the circulating filtration and cooling device 10 exchanges heat with the cooling coil 12 to form a clean water medium. Furthermore, the clean water medium is transported to the circulating mixing device 20 by the relay circulating pump 32. The clean water medium is injected through the multi-channel vortex distributor 21 located in the lower part of the circulating mixing device 20, forming a rotating water flow field inside the circulating mixing device 20. A drag-reducing agent is quantitatively added into the circulating mixing device 20. The top-mounted mechanical agitator 22 located at the top of the circulating mixing device 20 is activated. The operation of the top-mounted mechanical agitator 22 generates a mechanical agitation flow field. The mechanical agitation flow field and the rotating water flow field formed by the multi-channel vortex distributor 21 cross-shear each other. Under the action of cross-shearing, the drag-reducing agent dissolves in the clean water medium to generate a drag-reducing working fluid. The drag-reducing working fluid is discharged by the output circulating pump 33 at a constant speed. The flow rate is delivered to the inlet of the gas extraction water ring vacuum pump. The drag-reducing working fluid enters the gas extraction water ring vacuum pump, reducing the fluid shear resistance during operation. The level gauge 40, installed on the circulating filtration and cooling device 10 and the circulating mixing device 20, continuously collects the liquid level data. The level gauge 40 sends the liquid level data to the electrical control central control box 50. The electrical control central control box 50 receives the liquid level data and outputs control signals to the inlet circulating pump 31, the relay circulating pump 32, and the output circulating pump 33. The electrical control central control box 50 regulates the flow rate of waste working water, clean water medium, and drag-reducing working fluid in the system pipeline by controlling the start and stop status of the circulating pump group 30.

[0027] See attached document Figure 2 Appendix Figure 3 and attached Figure 6 The circulating filtration and cooling device 10 includes: a filter tank 13, a three-stage gravity gradient filter screen 11, and a cooling coil 12. A water inlet port is provided at the top of the filter tank 13. An inlet circulating pump 31 pumps waste working water into the filter tank 13 through the water inlet port. The three-stage gravity gradient filter screen 11 is fixed horizontally in the upper middle part of the filter tank 13. The three-stage gravity gradient filter screen 11, from top to bottom, includes a primary coarse filter screen 111, a secondary medium filter screen 112, and a tertiary fine filter screen 113. The mesh size of the primary coarse filter screen 111 is larger than that of the secondary medium filter screen 112. The mesh size of the secondary medium filter 112 is larger than that of the tertiary fine filter 113. The primary coarse filter 111, the secondary medium filter 112, and the tertiary fine filter 113 are all designed as conical structures inclined towards the center. The lower middle part of the conical structure of the primary coarse filter 111, the secondary medium filter 112, and the tertiary fine filter 113 are all fixedly connected to a sewage discharge pipe and a slag discharge pipe 114. A sewage discharge valve 115 is installed on the sewage discharge pipe and the slag discharge pipe 114. The output end of the sewage discharge pipe and the slag discharge pipe 114 penetrates the outer wall of the filter tank 13 and is fixed to the outside of the filter tank 13.

[0028] Furthermore, the circulating filtration and cooling device 10 also includes a flocculation reflux branch 14. The inlet end of the flocculation reflux branch 14 is connected to the outlet end of the circulating mixing device 20. The outlet end of the flocculation reflux branch 14 extends into the filter tank 13 and is located above the primary coarse filter screen 111. A metering pump is installed on the pipeline of the flocculation reflux branch 14. The metering pump is electrically connected to the electrical control central control box 50. The electrical control central control box 50 has multiple sets of feedback regulation logic preset inside. The electrical control central control box 50 outputs flow control commands to the metering pump. The metering pump receives the flow control commands and starts operating. The metering pump extracts part of the product according to the set flow rate. The drag-reducing working fluid is guided into the filter tank 13. The metering pump precisely controls the return flow rate of the drag-reducing working fluid. The drag-reducing working fluid mixes with the waste working water at the top of the filter tank 13. The drag-reducing agent contained in the drag-reducing working fluid changes the surface potential of suspended coal dust in the waste working water, causing the suspended coal dust to aggregate into flocs. The waste working water flows sequentially through the primary coarse filter 111, the secondary medium filter 112, and the tertiary fine filter 113 under the action of gravity. The primary coarse filter 111 traps large particulate impurities and flocs in the waste working water, while the secondary medium filter 112 and the tertiary fine filter 113 trap fine silt and scale particles in the waste working water.

[0029] Furthermore, the trapped impurities, flocs, silt, and scale particles, under the influence of gravity, collect at the lower middle part of the corresponding primary coarse filter 111, secondary medium filter 112, and tertiary fine filter 113. When the drain valve 115 is opened, the collected impurities are discharged to the outside of the filter tank 13 through the corresponding drain pipe and slag discharge pipe 114. The wastewater, after physical separation by the three-stage gravity gradient filter 11, forms a clean water medium. A liquid accumulation zone 15 is formed at the bottom of the filter tank 13. The clean water medium passing through the tertiary fine filter 113 flows into and collects inside the liquid accumulation zone 15. The cooling coil 12 is fixedly installed inside the liquid accumulation zone 15 and is immersed in the clean water medium within the liquid accumulation zone 15. The cooling coil 12 is arranged in a multi-turn spiral along the inner wall of the filter tank 13. The liquid inlet and liquid outlet of the cooling coil 12 extend through the side wall of the filter tank 13 and are connected to the circulation pipeline of the external refrigeration unit. The external refrigeration unit inputs the refrigerant into the cooling coil 12. The clean water medium in the liquid accumulation zone 15 comes into contact with the pipe wall of the cooling coil 12 and undergoes heat exchange. The refrigerant absorbs the heat contained in the clean water medium, and the temperature of the clean water medium drops to within a set threshold range. The water inlet of the relay circulation pump 32 is connected to the bottom of the liquid accumulation zone 15 through a pipeline. The relay circulation pump 32 draws out the clean water medium that has completed heat exchange in the liquid accumulation zone 15 and pressurizes and delivers the clean water medium to the circulation mixing device 20.

[0030] See attached document Figure 2 Appendix Figure 4 and attached Figure 5The circulating mixing device 20 includes: a mixing tank 23, a multi-channel vortex distributor 21, and a top-mounted mechanical stirring device 22. A dosing mechanism is installed on the top of the mixing tank 23, through which drag-reducing agents are injected into the internal space of the mixing tank 23. The multi-channel vortex distributor 21 is fixed to the upper side wall of the mixing tank 23 and has an annular hollow structure. The outlet of the relay circulating pump 32 is connected to the inlet of the multi-channel vortex distributor 21 via a pipeline. The relay circulating pump 32 pressurizes the clean water medium into the multi-channel vortex distributor 21. The lower side of the multi-channel vortex distributor 21... The multi-channel vortex water distributor 21 has multiple spray nozzles at different angles, and the multiple spray nozzles are arranged alternately. The cleaning water medium is ejected from the multiple spray nozzles of the multi-channel vortex water distributor 21. The cleaning water medium forms a rotating hydrodynamic flow field from bottom to top inside the mixing tank 23. The top-mounted mechanical stirring device 22 is installed on the top of the mixing tank 23. The top-mounted mechanical stirring device 22 includes a stirring motor and a stirring impeller. The stirring motor 221 drives the stirring impeller to rotate. The mixing tank 23 is also equipped with a cooling coil 12 arranged in a multi-turn spiral shape inside.

[0031] Furthermore, the top-mounted mechanical agitator 22 generates a top-down mechanical agitation flow field. This flow field intersects with the rotating hydrodynamic flow field generated by the multi-channel vortex distributor 21 in the central region of the mixing tank 23. The electrical control central control box 50 controls the rotation direction of the top-mounted mechanical agitator 22. The rotation direction of the mechanical agitation flow field intersects with the rotation direction of the rotating hydrodynamic flow field at a preset angle. This intersection forms a cross-shear zone, within which the drag-reducing agent reacts. The components disperse and dissolve in the clean water medium. The electrical control central control box 50 outputs a frequency control signal to the relay circulation pump 32 and the top-mounted mechanical agitator 22. The electrical control central control box 50 adjusts the water supply flow rate of the relay circulation pump 32 to change the average water flow velocity, and adjusts the rotation speed of the top-mounted mechanical agitator 22 to change the linear velocity of the outer edge of the agitator impeller. Through the above adjustment of rotation speed and flow rate, the effective mixing Reynolds number inside the cross-shear zone is maintained within the set value range, and the drag-reducing agent dissolves in the clean water medium to complete the preparation of the drag-reducing working solution.

[0032] See attached document Figure 2 - Appendix Figure 4The circulating pump set 30 includes an inlet circulating pump 31, a relay circulating pump 32, and an output circulating pump 33. The inlet of the output circulating pump 33 is connected to the outlet of the bottom of the circulating mixing device 20. The outlet of the output circulating pump 33 is connected to the working liquid inlet of the gas extraction water ring vacuum pump through a water supply pipeline. The electrical control central control box 50 sends a constant flow control signal to the output circulating pump 33. The output circulating pump 33 receives the constant flow control signal and operates according to the set flow parameters. The output circulating pump 33 extracts circulating mixing liquid. The drag-reducing working fluid inside device 20 is pumped into the internal cavity of the gas extraction water ring vacuum pump by the output circulation pump 33. The drag-reducing working fluid acts as the working medium inside the gas extraction water ring vacuum pump. The impeller of the gas extraction water ring vacuum pump drives the drag-reducing working fluid to form a water ring. The drag-reducing agent contained in the drag-reducing working fluid has a long polymer chain. The long polymer chain is stretched and oriented in the centrifugal force field and shear force field generated by the impeller. The stretching of the long polymer chain changes the microfluid structure of the drag-reducing working fluid.

[0033] Furthermore, the frictional resistance generated by the drag-reducing working fluid flowing inside the gas extraction water ring vacuum pump is reduced, and the shaft power consumed by the gas extraction water ring vacuum pump to overcome fluid resistance is reduced. The inlet circulation pump 31 is installed between the drain port of the gas extraction water ring vacuum pump and the inlet end of the circulating filtration and cooling device 10. The inlet circulation pump 31 provides the power to transport the waste working water. The relay circulation pump 32 is installed between the outlet end of the circulating filtration and cooling device 10 and the inlet end of the circulating mixing device 20. The relay circulation pump 32 provides the power to pressurize the clean water medium. The electrical control central control box 50 outputs the operating frequency adjustment command to the inlet circulation pump 31, the relay circulation pump 32 and the output circulation pump 33. The flow rate of the waste working water transported by the inlet circulation pump 31, the flow rate of the clean water medium transported by the relay circulation pump 32 and the flow rate of the drag-reducing working fluid transported by the output circulation pump 33 are kept in balance, and the system pipeline forms a stable closed-loop working fluid replenishment link.

[0034] See attached document Figure 1 - Appendix Figure 4 The electrical control central control box 50 includes: a level gauge 40, a pipeline pressure sensor 41, and a pipeline electric valve 42. The level gauge 40 is fixed to the outer wall of the filter tank 13 included in the circulating filtration and cooling device 10 and the outer wall of the mixing tank 23 included in the circulating mixing device 20. The pipeline pressure sensor 41 is installed on the inlet pipeline of the output circulating pump 33. The pipeline electric valve 42 is installed on the inlet pipeline of the relay circulating pump 32. The level gauge 40 collects the liquid level height inside the filter tank 13 and the liquid level height inside the mixing tank 23, and outputs the liquid level height data to the electrical control central control box 50. The pipeline pressure sensor 41 detects the fluid pressure inside the pipeline and outputs the pressure data to the electrical control central control box 50.

[0035] Furthermore, the electrical control central control box 50 receives liquid level and pressure data. The electrical control central control box 50 has internally set liquid level safety ranges and pressure safety thresholds. The electrical control central control box 50 calculates the difference between the liquid level data and the liquid level safety range, and outputs control commands based on the difference. These control commands are sent to the inlet circulating pump 31, the relay circulating pump 32, the output circulating pump 33, and the pipeline electric valve 42. The electrical control central control box 50 switches the opening and closing states of the pipeline electric valve 42 through the control commands. The gas control central control box 50 adjusts the operating frequency of the inlet circulating pump 31, the relay circulating pump 32, and the output circulating pump 33 through control commands, and maintains a constant flow rate of waste working water, clean water medium, and drag-reducing working fluid. The electrical control central control box 50 has built-in agent concentration decay control logic. The electrical control central control box 50 calculates the consumption of drag-reducing agent based on the running time and load status of the gas extraction water ring vacuum pump. The electrical control central control box 50 combines the consumption and liquid level data to control the circulating mixing device 20 to perform drag-reducing working fluid mixing.

[0036] Furthermore, when the pressure data deviates from the system's set pressure safety threshold, it indicates that the system has experienced pipeline overpressure or serious leakage. The electrical control central control box 50 executes a physical electrical interlock action. An emergency stop button 51 is configured on the outer panel of the electrical control central control box 50. Pressing the emergency stop button 51 generates a circuit breaker signal, which is transmitted to the electrical control central control box 50. When the electrical control central control box 50 receives the circuit breaker signal or executes a physical electrical interlock action, the relay group inside the electrical control central control box 50 disconnects the contact. The electrical control central control box 50 cuts off the power supply lines to the inlet circulating pump 31, the relay circulating pump 32, the output circulating pump 33, and the top-mounted mechanical stirring device 22 included in the circulating mixing device 20, and the entire device stops physical circulation operation.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drag-reducing and efficiency-improving device for a gas extraction water ring vacuum pump, characterized in that, include: The system includes a circulating filtration and cooling device (10), a circulating mixing device (20), a circulating pump group (30), a level gauge (40), and an electrical control central control box (50) for a gas extraction water ring vacuum pump. The circulating pump group (30) includes an inlet circulating pump (31), a relay circulating pump (32), and an output circulating pump (33). The circulating filtration and cooling device (10) is equipped with an inlet end and an outlet end. The circulating mixing device (20) is equipped with an inlet end and an outlet end. The inlet circulating pump (31) is connected to the inlet end of the circulating filtration and cooling device (10). The outlet end of the circulating filtration and cooling device (10) is connected to the inlet end of the circulating mixing device (20) after being connected in series with the relay circulating pump (32). The outlet end of the circulating mixing device (20) is connected to the output circulating pump (33). The output circulating pump (33) is connected to the inlet of the gas extraction water ring vacuum pump through a pipeline. The circulating filtration and cooling device (10) includes a filter tank (13), a three-stage gravity gradient filter (11), and a cooling coil (12); the three-stage gravity gradient filter (11) is fixed inside the filter tank (13); a liquid accumulation area (15) is provided at the lower part of the filter tank (13), and the cooling coil (12) is fixedly installed inside the liquid accumulation area (15); The circulating mixing device (20) includes a mixing tank (23), a multi-channel vortex distributor (21), and a top-mounted mechanical stirring device (22); the multi-channel vortex distributor (21) is equipped with an inlet end, and the relay circulating pump (32) is equipped with an outlet end; the multi-channel vortex distributor (21) is fixed to the upper side wall of the mixing tank (23), and the outlet end of the relay circulating pump (32) is connected to the inlet end of the multi-channel vortex distributor (21) through a pipeline; the top-mounted mechanical stirring device (22) is installed on the top of the mixing tank (23); The electrical control central control box (50) is electrically connected to the inlet circulating pump (31), the relay circulating pump (32), the output circulating pump (33), the top-mounted mechanical stirring device (22), and the level gauge (40).

2. The drag reduction and efficiency improvement device for a gas extraction water ring vacuum pump according to claim 1, characterized in that, The three-stage gravity gradient filter (11) includes, from top to bottom, a first-stage coarse filter (111), a second-stage medium filter (112), and a third-stage fine filter (113). The primary coarse filter (111) is configured with a certain mesh size, the secondary medium filter (112) is configured with a certain mesh size, and the tertiary fine filter (113) is configured with a certain mesh size; the mesh size of the primary coarse filter (111) is larger than that of the secondary medium filter (112), the mesh size of the secondary medium filter (112) is larger than that of the tertiary fine filter (113), and the primary coarse filter 111, the secondary medium filter 112 and the tertiary fine filter 113 are all configured as a conical structure inclined towards the center; The conical structure of the primary coarse filter (111), the secondary medium filter (112), and the tertiary fine filter (113) is fixedly connected to a slag discharge pipe (114); the slag discharge pipe (114) is equipped with a drain valve (115) and an output end; the drain valve (115) is installed on the pipeline of the slag discharge pipe (114); the filter tank (13) is equipped with an outer wall and an outer side; the output end of the slag discharge pipe (114) passes through the outer wall of the filter tank (13) and is fixed to the outer side of the filter tank (13).

3. The drag reduction and efficiency improvement device for a gas extraction water ring vacuum pump according to claim 2, characterized in that, The circulating filtration and cooling device (10) also includes a flocculation reflux branch (14). The flocculation reflux branch (14) is equipped with an inlet end, an outlet end and a pipeline; the inlet end of the flocculation reflux branch (14) is connected to the outlet end of the circulating mixing device (20), and the outlet end of the flocculation reflux branch (14) extends into the filter tank (13) and is located above the primary coarse filter screen (111). A metering pump is installed on the pipeline of the flocculation return branch (14). The metering pump is electrically connected to the electrical control central control box (50). The electrical control central control box (50) is configured to output flow control commands to the metering pump.

4. The drag reduction and efficiency improvement device for a gas extraction water ring vacuum pump according to claim 1, characterized in that, The filter tank (13) is provided with an inner wall and a side wall, and the cooling coil (12) is provided with a liquid inlet and a liquid outlet. The cooling coil (12) is in the shape of a multi-turn spiral. The liquid inlet and liquid outlet of the cooling coil (12) protrude through the side wall of the filter tank (13) and are used to connect to the circulation pipeline of the external refrigeration unit.

5. The drag reduction and efficiency improvement device for a gas extraction water ring vacuum pump according to claim 1, characterized in that, The multi-channel vortex water distributor (21) is equipped with a lower side and multiple spray nozzles. The lower side of the multi-channel vortex water distributor (21) has multiple spray nozzles at different angles. The multiple spray nozzles included in the multi-channel vortex water distributor (21) are arranged alternately in sequence. The top-mounted mechanical stirring device (22) includes a stirring motor (221) and a stirring impeller (222), wherein the stirring motor (221) drives the stirring impeller (222) to rotate; The mixing tank (23) is also equipped with a cooling coil (12) arranged in a multi-turn spiral shape inside.

6. The drag reduction and efficiency improvement device for a gas extraction water ring vacuum pump according to claim 5, characterized in that, The electrical control central control box (50) is configured to control the rotation direction of the top-mounted mechanical stirring device (22), so that the rotation direction of the mechanical stirring flow field generated by the operation of the top-mounted mechanical stirring device (22) intersects the rotation direction of the rotating hydrodynamic flow field generated by the multi-channel vortex water distributor (21) at a preset angle, forming a cross-shear zone inside the mixing tank (23).

7. The drag reduction and efficiency improvement device for a gas extraction water ring vacuum pump according to claim 6, characterized in that, The electrical control central control box (50) is configured to output frequency control signals to the relay circulation pump (32) and the top-mounted mechanical stirring device (22); The electrical control central control box (50) adjusts the water supply flow rate of the relay circulation pump (32) to change the average water flow velocity of the multiple injection ports, and adjusts the rotation speed of the top mechanical stirring device (22) to change the linear velocity of the outer edge of the stirring impeller, thereby adjusting the fluid mixing state inside the cross-shear zone.

8. The drag reduction and efficiency improvement device for a gas extraction water ring vacuum pump according to claim 1, characterized in that, Both the filter tank (13) and the mixing tank (23) are provided with outer side walls, and the level gauge (40) is fixed to the outer side wall of the filter tank (13) and the outer side wall of the mixing tank (23). The electrical control central control box (50) has a liquid level safety range set inside. The liquid level gauge (40) collects the liquid level height inside the filter tank (13) and the liquid level height inside the mixing tank (23) to generate liquid level height data, and outputs the liquid level height data to the electrical control central control box (50). The electrical control central control box (50) calculates the difference between the liquid level height data and the liquid level safety range and outputs control commands to adjust the operating frequency of the inlet circulation pump (31), the relay circulation pump (32) and the output circulation pump (33).

9. The drag reduction and efficiency improvement device for a gas extraction water ring vacuum pump according to claim 1, characterized in that, The device also includes a pipeline pressure sensor (41) and a pipeline electric valve (42). The output circulation pump (33) is equipped with an inlet pipe, and the relay circulation pump (32) is equipped with an inlet pipe; the pipe pressure sensor (41) is installed on the inlet pipe of the output circulation pump (33), and the pipe electric valve (42) is installed on the inlet pipe of the relay circulation pump (32); The electrical control central control box (50) establishes an electrical connection with the pipeline pressure sensor (41) and the pipeline electric valve (42) respectively; the pipeline pressure sensor (41) detects the fluid pressure inside the pipeline and outputs pressure data to the electrical control central control box (50).

10. The drag reduction and efficiency improvement device for a gas extraction water ring vacuum pump according to claim 9, characterized in that, The electrical control central control box (50) is equipped with an outer panel, and the outer panel of the electrical control central control box (50) is equipped with an emergency stop button (51). The electrical control central control box (50) is equipped with a pressure safety threshold and a relay group. When the pressure data deviates from the pressure safety threshold, or when the emergency stop button (51) is pressed to generate a circuit breaker signal, the relay group disconnects and cuts off the power supply lines of the inlet circulation pump (31), the relay circulation pump (32), the output circulation pump (33), and the top-mounted mechanical stirring device (22).

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