Isolating liquid column driven special medium conveying system and working method thereof

Abstract

This invention belongs to the field of fluid transport technology and discloses a special media transport system driven by an isolated liquid column and its working method. The system includes a power unit connected to a process pipeline unit. The power unit includes a symmetrically acting pump with a first driving chamber and a second driving chamber. The first driving chamber is connected to a first transport pipe, and the second driving chamber is connected to a second transport pipe. The process pipeline unit includes a symmetrically arranged first U-shaped pipe and a second U-shaped pipe. One end of the first transport pipe is connected to one end of the first U-shaped pipe, and the other end of the second transport pipe is connected to one transport unit. The other end of the first U-shaped pipe is connected to the second transport unit. This invention has a simple overall structure, enables zero-leakage transport of special media, eliminates the need for explosion-proof motors, avoids shear damage and wear / corrosion of flow-through components, and improves performance.

Description

Technical Field

[0001] This invention belongs to the field of fluid transport technology, specifically, it relates to a special media transport system driven by an isolated liquid column and its working method. Background Technology

[0002] As a core piece of general fluid transport equipment, pumps are widely used in key sectors of the national economy such as petrochemicals, fine chemicals, biopharmaceuticals, food processing, environmental engineering, and mining and metallurgy. In particular, in the transport of special media such as flammable and explosive, highly toxic, sterile, high solids content, shear-sensitive, and highly corrosive media, extremely high requirements are placed on the equipment's sealing performance, safety, media compatibility, and operational stability.

[0003] Currently, the mainstream pumps used in industrial applications mainly include centrifugal pumps, reciprocating pumps, plunger pumps, diaphragm pumps, magnetic pumps, and canned motor pumps. Traditional centrifugal and reciprocating pumps have mature structures and wide applications, but their shafts and pump bodies generally use mechanical seals or packing seals to form a dynamic sealing pair. During operation, there is relative friction, and long-term use is prone to wear, aging, and leakage problems. They cannot meet the zero-leakage requirements for high-risk media, and the life of the seals is usually only 5,000 to 6,000 hours, requiring frequent replacement, resulting in high maintenance costs and a high risk of downtime. In explosion-proof environments, traditional pumps must be equipped with special components such as explosion-proof motors and explosion-proof junction boxes, with equipment investment 3 to 5 times that of ordinary pumps. They also need to pass explosion-proof certification separately, further increasing the operating cost. At the same time, moving parts such as impellers, screws, and pistons are in direct contact with the medium, which can easily cause blockage and erosion wear when conveying slurries with high solids content. When conveying shear-sensitive media, it can cause molecular chain breakage and reduced activity. When conveying highly corrosive media, the flow-through parts are easily corroded and damaged. Cavitation also significantly shortens the service life of the equipment. The industry usually can only alleviate the problems by using high-cost materials such as duplex stainless steel, Hastelloy, and ceramic coatings, which is difficult to solve the problem at its root.

[0004] A Chinese patent application with application number CN202210584864.7 discloses a leak-free centrifugal pump. Through the structural design of a sealing assembly added between the pump body and the impeller, leakage at the impeller inlet can be effectively prevented. The reasonable material selection and size design of the sealing assembly, along with the addition of springs and flow holes, can reduce the heat generated by friction between the rotating and stationary rings while ensuring sealing performance. It can also effectively slow down the wear of the sealing assembly material, thereby extending the service life of the sealing assembly. Furthermore, it improves the overall sealing performance and mechanical efficiency of the pump, extends the service life of the entire pump, and significantly reduces the probability of mechanical failure, ensuring safety. However, magnetic pumps have drawbacks such as low magnetic transmission efficiency, limited torque, inability to withstand impurities, and strict prohibition of idling. The isolation sleeve is prone to wear and damage, and still relies on solid isolation components to achieve media separation. Although canned motor pumps further improve sealing, the motor rotor is immersed in the medium, and there is still a problem of contact between the medium and moving parts, making them unsuitable for extreme working conditions with high solid content and strong corrosion.

[0005] While positive displacement pumps such as diaphragm pumps and plunger pumps have improved wear resistance and sealing performance to some extent, the diaphragm of a diaphragm pump is a vulnerable part that is prone to fatigue and rupture in solid media. Plunger pumps still have a friction pair between the plunger and the seal, which cannot completely eliminate the risk of wear and leakage. Moreover, they have not gotten rid of the three major technical biases: "the drive end and the medium end must be isolated by solid components," "the medium must flow through the flow-moving parts," and "materials must be upgraded to cope with wear and corrosion." It is difficult to balance sealing performance, durability, and media compatibility.

[0006] In summary, existing transfer pumps generally suffer from defects such as easy leakage of seals, high cost of explosion-proof materials, large shear force, easy clogging and wear, poor resistance to corrosion and cavitation, and complex structure. They are not suitable for special media transportation scenarios such as explosion-proof, high-risk, clean, high-solids, shear-sensitive, and highly corrosive media. The industry lacks a truly near-zero leakage, no solid isolation, no contact between the medium and moving parts, and a fully liquid-driven transfer pump that avoids wear, corrosion, and cavitation in principle. This makes it difficult to meet the high-efficiency and safe transportation requirements of high-end manufacturing and special working conditions. Summary of the Invention

[0007] The main technical problem to be solved by this invention is to provide a special medium conveying system with a simple overall structure and an isolation liquid column driven system and its working method, which can achieve near-zero leakage conveying of special media, without the need for explosion-proof motors, shear damage, or wear and corrosion of flow-through components, fundamentally solving the problems of easy failure and blockage of existing pump seals, high cost, and poor reliability.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A special media conveying system driven by an isolated liquid column includes a power unit connected to a process pipeline unit. The power unit includes a symmetrically acting pump with a first driving chamber and a second driving chamber. The first driving chamber is connected to a first conveying pipe, and the second driving chamber is connected to a second conveying pipe. The process pipeline unit includes a first U-shaped pipe and a second U-shaped pipe symmetrically arranged. One end of the first conveying pipe is connected to one end of the first U-shaped pipe, and one end of the second conveying pipe is connected to one end of the second U-shaped pipe. The other end of the first U-shaped pipe is connected to a first conveying unit, and the other end of the second U-shaped pipe is connected to a second conveying unit. Both the first U-shaped tube and the second U-shaped tube are configured with a three-section structure: the two ends are respectively configured as a driving liquid section and a conveying medium section, and the middle is configured as an isolation liquid section. The first driving cavity, the second driving cavity, the first conveying pipe, the second conveying pipe and the driving liquid section are all filled with driving liquid, the conveying medium section is filled with conveying medium, and the isolation liquid section is filled with isolation liquid. The isolating fluid forms a liquid piston column. When stationary, it sinks to the bottom of the first U-tube and the second U-tube due to gravity, separating the driving fluid and the conveying medium on both sides. When the power unit is activated, it pushes the driving fluid, which pushes one end of the liquid piston column, while the isolating fluid moves smoothly in the pipeline. The other end then pushes the conveying medium to complete the intake and discharge.

[0009] The following are further optimizations of the above technical solution by the present invention: The first conveying pipe is connected to the driving liquid section of the first U-shaped pipe, and the first conveying unit is connected to the conveying medium section of the first U-shaped pipe.

[0010] Further optimization: The second conveying pipe is connected to the driving liquid section of the second U-shaped pipe, and the second conveying unit is connected to the conveying medium section of the second U-shaped pipe.

[0011] Further optimization: The first conveying unit includes a first medium pipeline that is sealed and connected to the driving liquid part of the first U-shaped tube, the outlet end of the first medium pipeline is connected to a first medium conveying pipeline, and the first medium conveying pipeline is arranged perpendicularly to the first medium pipeline.

[0012] Further optimization: The first medium conveying pipeline is also connected to a first inlet check valve and a first outlet check valve. The first inlet check valve only allows the conveying medium to flow into the conveying medium section of the first U-shaped tube from the external conveying medium pipeline, and the first outlet check valve only allows the conveying medium to be output from the first U-shaped tube.

[0013] Further optimization: The second medium pipeline is sealed and connected to the driving liquid part of the second U-tube of the second conveying unit, and the outlet end of the second medium pipeline is connected to the second medium conveying pipeline. The second medium conveying pipeline is arranged perpendicular to the second medium pipeline.

[0014] Further optimization: The second medium conveying pipeline is also connected to a second inlet check valve and a second outlet check valve. The second inlet check valve only allows the conveying medium to flow into the conveying medium section of the second U-tube from the external conveying medium pipeline, and the second outlet check valve only allows the conveying medium to be output from the second U-tube.

[0015] Further optimization: The isolation fluid is selected as perfluoropolyether oil, which has a density greater than that of the driving fluid and the conveying medium. The driving fluid is selected as a commonly used lubricant.

[0016] This invention also provides a method for operating a special media conveying system driven by an isolating liquid column. Using the aforementioned isolating liquid column driven special media conveying system includes the following steps: S1. Inject driving fluid, isolation fluid and conveying medium into the first U-tube and the second U-tube respectively, and use the density difference between the isolation fluid and the driving fluid and conveying medium to make the isolation fluid form a liquid piston state. S2. Start the power unit, and the symmetrical pump outputs driving fluid to the first driving chamber. The driving fluid enters the driving fluid section of the first U-shaped tube through the first conveying pipe, pushing the isolation fluid to move towards the conveying medium section. Under the pushing of the isolation fluid, the pressure inside the first U-shaped tube increases, the first feed check valve of the first conveying unit closes, the first discharge check valve opens, and the conveying medium is forced out and conveyed outward. At the same time, the second drive chamber is in a low-pressure return state, the pressure of the drive liquid in the second U-tube decreases, the isolation liquid moves in the opposite direction, the second discharge check valve of the second conveying unit closes and the second feed check valve opens, and the external conveying medium is sucked into the second U-tube to complete the liquid suction process. S3, the symmetrical pump reverses direction, outputting high-pressure driving fluid to the second drive chamber. The driving fluid enters the driving fluid section of the second U-shaped tube through the second conveying pipe, pushing the isolation fluid to move towards the conveying medium section. The pressure inside the second U-shaped tube increases, the second inlet check valve of the second conveying unit closes, the second outlet check valve opens, and the conveying medium is forced out and conveyed outward. At the same time, the first drive chamber switches to the low-pressure return state, the pressure of the drive liquid in the first U-tube decreases, the isolation liquid moves in the reverse direction, the first discharge check valve of the first conveying unit closes and the first feed check valve opens, and the external conveying medium is sucked into the first U-tube to prepare for the next discharge. S4. Repeat S2 and S3. Through the continuous reversing drive of the symmetrical pump, the first U-tube and the second U-tube alternately complete the liquid discharge and liquid suction actions to achieve continuous and stable delivery of the medium. Until the delivery task is completed, the operation of the power unit is stopped and the system enters the shutdown state.

[0017] The present invention, by adopting the above technical solution, has the following beneficial effects: This invention employs the aforementioned technical solution, featuring ingenious design and a rational structure. It achieves near-zero leakage and gentle, shear-free transport of special media. It utilizes an isolating liquid column to form a dynamic seal at the liquid-liquid interface without solid contact, eliminating the need for mechanical seals, packing seals, diaphragms, and friction pairs. This fundamentally eliminates the leakage risks of flammable, explosive, highly toxic, highly corrosive, and sterile media. Furthermore, the transport process eliminates high-speed moving parts such as impellers, screws, and pistons, relying solely on the stable displacement of the isolating liquid to drive the medium. With extremely low shear force, it can completely protect the quality and activity of shear-sensitive media such as biological products, polymers, and food liquids, significantly improving transport safety and media integrity.

[0018] It can also completely eliminate wear, corrosion, and cavitation, significantly extending equipment life. The conveyed medium only comes into contact with static structures such as the isolation fluid, pipeline inner wall, and check valves throughout the entire process, without contacting any rotating or reciprocating moving parts. In principle, it avoids the problems of scouring wear, chemical corrosion, and cavitation damage that exist in traditional pumps. The system does not require the use of expensive corrosion-resistant and wear-resistant materials such as duplex stainless steel and Hastelloy, and can be adapted to extreme working conditions such as high solids content, strong corrosion, and easy vaporization. The service life of the equipment is greatly extended, and the maintenance frequency and operating costs are significantly reduced.

[0019] Simultaneously, the power and conveying units are remotely separated, significantly reducing explosion-proof requirements and overall investment. The power unit can be located in a safe area, and the conveying unit has no electrical components, eliminating the need for explosion-proof motors, junction boxes, and certifications. This results in a substantial reduction in equipment investment compared to traditional explosion-proof pumps. Furthermore, the system enables remote driving and long-distance conveying, offering flexible installation and layout without being limited by site space or hazardous areas. This enhances on-site safety while significantly reducing construction and equipment investment costs.

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram illustrating the initial working state of the overall structure in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram illustrating the working principle of the overall structure conveying system in Embodiment 1 of the present invention. Figure 3 This is a schematic diagram of the interface state of the isolation liquid, the conveying medium, and the driving medium in the second U-shaped pipeline conveying operation state in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the cross-section of the guide vane arrangement in Embodiment 3 of the present invention; Figure 5 This is a schematic diagram of the cross-section of the guide vane arrangement in Embodiment 4 of the present invention; Figure 6 This is a schematic diagram of the cross-section of the guide plate arrangement in Embodiment 5 of the present invention.

[0022] In the diagram: 1. Power unit; 11. Symmetrical pump; 12. First drive chamber; 13. Second drive chamber; 14. First conveying pipe; 15. Second conveying pipe; 2. Process piping unit; 21. First U-tube; 210. Drive fluid section; 211. Isolation fluid section; 212. Conveying medium section; 22. Second U-tube; 23. First conveying unit; 231. First feed check valve; 232. First discharge check valve; 24. Second conveying unit; 241. Second feed check valve; 242. Second discharge check valve; 3. Isolation fluid; 4. Conveying medium; 5. Drive fluid; 6. Guide plate. Detailed Implementation

[0023] Example 1:

[0024] like Figure 1-3 As shown: A special media conveying system driven by an isolated liquid column includes a power unit 1, which is connected to a process pipeline unit 2 to provide power for media conveying. The power unit 1 includes a symmetrically acting pump 11, which is provided with a first driving chamber 12 and a second driving chamber 13. The first driving chamber 12 is connected to a first conveying pipe 14, and the second driving chamber 13 is connected to a second conveying pipe 15. The process pipeline unit 2 includes a symmetrically arranged first U-shaped pipe 21 and a second U-shaped pipe 22. The first conveying pipe 14 is connected to one end of the first U-shaped pipe 21, and the second conveying pipe 15 is connected to one end of the second U-shaped pipe 22. The other end of the first U-shaped pipe 21 is connected to a first conveying unit 23, and the other end of the second U-shaped pipe 22 is connected to a second conveying unit 24. Both the first U-shaped tube 21 and the second U-shaped tube 22 are configured as three-section structures: the two ends are respectively configured as driving liquid section 210 and conveying medium section 212, and the middle is configured as isolation liquid section 211. The first driving cavity 12, the second driving cavity 13, the first conveying pipe 14, the second conveying pipe 15 and the driving liquid section 210 are filled with driving liquid 5, the conveying medium section 212 is filled with conveying medium 4, and the isolation liquid section 211 is filled with isolation liquid 3. The isolating liquid 3 forms a liquid piston column. When stationary, it sinks to the bottom of the first U-tube 21 and the second U-tube 22 due to gravity, separating the driving liquid 5 and the conveying medium 4 on both sides. When the power unit 1 is activated, it pushes the driving liquid 5, which pushes one end of the liquid piston column. The isolating liquid 3 then moves smoothly in the pipeline, and the other end pushes the conveying medium 4 to complete the intake and discharge.

[0025] The first conveying pipe 14 is connected to the driving liquid section 210 of the first U-shaped pipe 21, and the first conveying unit 23 is connected to the conveying medium section 212 of the first U-shaped pipe 21.

[0026] The second conveying pipe 15 is connected to the driving liquid section 210 of the second U-shaped pipe 22, and the second conveying unit 24 is connected to the conveying medium section 212 of the second U-shaped pipe 22.

[0027] There is no fixed friction pair between the liquid piston column and the walls of the first U-tube 21 and the second U-tube 22. Its sealing relies on the dynamic pressure liquid film formed by its own viscosity and interfacial tension, thus fundamentally eliminating wear, leakage and shearing of the conveying medium 4.

[0028] In this embodiment 1, the symmetrical pump 11 is a double-acting hydraulic reversing pump. The pump body is equipped with symmetrically arranged pistons and reversing mechanisms, which can alternately output high-pressure driving fluid 5 to the first driving chamber 12 and the second driving chamber 13 to achieve bidirectional and reciprocating power output. When the driving fluid 5 pushes the piston to one side, the volume of one chamber decreases and the driving fluid 5 is pressurized and output; the volume of the other chamber increases, forming a low-pressure return state; when the piston moves to the end of its stroke, the reversing mechanism automatically switches the direction of fluid flow, causing the piston to move in the opposite direction, realizing the alternating pressurization and depressurization of the two chambers.

[0029] Through this dual-action structure, the driving fluid 5 can form alternating pressure pulses in the first delivery pipe 14 and the second delivery pipe 15, respectively driving the isolation fluid 3 in the first U-shaped pipe 21 and the second U-shaped pipe 22 to reciprocate, thereby driving the delivery medium 4 to complete continuous suction and discharge actions, ensuring the stable circulation operation of the delivery system.

[0030] The specific structure and working principle of the double-acting hydraulic reversing pump are well known in the prior art and will not be described in detail here.

[0031] The connection ends of the first conveying pipe 14 and the driving liquid section 210 of the first U-shaped pipe 21, as well as the connection ends of the second conveying pipe 15 and the driving liquid section 210 of the second U-shaped pipe 22, are reliably connected and sealed through a flange connection structure. A medium-resistant and high-pressure-resistant sealing gasket is set between the flanges of the two, and the connection is evenly locked by bolt and nut assembly to form a static seal connection. This connection method can withstand the high-pressure pulsation of the driving liquid 5, effectively prevent the leakage of the driving liquid 5, and is convenient for disassembly and maintenance, and is suitable for the working conditions of special media transportation.

[0032] The connection ends of the first conveying unit 23 and the conveying medium section 212 of the first U-tube 21, as well as the connection ends of the second conveying unit 24 and the conveying medium section 212 of the second U-tube 22, are also reliably connected and sealed through flange connection structures.

[0033] The first delivery unit 23 includes a first medium pipeline that is sealed and connected to the driving liquid section 210 of the first U-tube 21.

[0034] The outlet end of the first medium pipeline is connected to a first medium delivery pipeline, which is arranged perpendicularly to the first medium pipeline.

[0035] The first medium conveying pipeline is also connected to a first feed check valve 231 and a first discharge check valve 232.

[0036] The first feed check valve 231 and the first discharge check valve 232 are located on the feed side and discharge side of the first medium conveying pipeline, respectively. Both are fluid unidirectional conduction structures and have opposite conduction directions: the first feed check valve 231 only allows the conveying medium 4 to flow into the conveying medium section 212 of the first U-tube 21 from the external conveying medium 4 pipeline, and the first discharge check valve 232 only allows the conveying medium 4 to be output from the first U-tube 21 to the outside, thus forming a complete conveying medium 4 suction-discharge control loop.

[0037] The second delivery unit 24 includes a second medium pipeline that is sealed and connected to the drive liquid section 210 of the second U-tube 22.

[0038] The outlet end of the second medium pipeline is connected to a second medium delivery pipeline, which is arranged perpendicularly to the second medium pipeline.

[0039] The second medium conveying pipeline is also connected to a second inlet check valve 241 and a second outlet check valve 242.

[0040] The second feed check valve 241 and the second discharge check valve 242 are located on the feed side and discharge side of the second medium conveying pipeline, respectively. Both are fluid unidirectional conduction structures and have opposite conduction directions: the second feed check valve 241 only allows the conveying medium 4 to flow into the conveying medium section 212 of the second U-tube 22 from the external conveying medium 4 pipeline, and the second discharge check valve 242 only allows the conveying medium 4 to be output from the second U-tube 22, thus forming a complete conveying medium 4 suction-discharge control loop.

[0041] In this embodiment 1, the isolation fluid 3 is selected as perfluoropolyether oil (PFPE), which has a higher density than the driving fluid 5 and the conveying medium 4. The driving fluid 5 is selected as a commonly used lubricant.

[0042] This invention also provides a method for operating a special media conveying system driven by an isolating liquid column. Using the aforementioned isolating liquid column driven special media conveying system includes the following steps: S1. Drive fluid 5, isolation fluid 3, and conveying medium 4 are injected into the first U-tube 21 and the second U-tube 22 respectively. Utilizing the density difference between the isolation fluid 3 and the drive fluid 5 and conveying medium 4, the isolation fluid 3 forms a stable liquid layer at the bottom of the U-tube, completely separating the drive fluid section 210 and the conveying medium section 212, forming a liquid piston state. At the same time, the filling and venting of the drive fluid 5 circuit are completed to ensure that the power unit 1 can build up pressure normally. S2. Start the power unit 1. The symmetrical pump 11 outputs driving fluid 5 to the first drive chamber 12. The driving fluid 5 enters the driving fluid section 210 of the first U-shaped tube 21 through the first conveying pipe 14, pushing the isolation fluid 3 to move towards the conveying medium section 212. Under the pushing of the isolation fluid 3, the pressure in the first U-shaped tube 21 increases. The first feed check valve 231 of the first conveying unit 23 closes and the first discharge check valve 232 opens, and the conveying medium 4 is forced out and conveyed outward. At the same time, the second drive chamber 13 is in a low-pressure return state, the pressure of the drive liquid section 210 of the second U-tube 22 decreases, the isolation liquid 3 moves in the opposite direction, the second discharge check valve 242 of the second conveying unit 24 closes and the second feed check valve 241 opens, and the external conveying medium 4 is sucked into the second U-tube 22 to complete the liquid suction process. S3, the symmetrical pump 11 reverses direction and outputs high-pressure driving fluid 5 to the second drive chamber 13. The driving fluid 5 enters the driving fluid section 210 of the second U-shaped tube 22 through the second conveying pipe 15, pushing the isolation fluid 3 to move towards the conveying medium section 212. The pressure inside the second U-shaped tube 22 increases, the second feed check valve 241 of the second conveying unit 24 closes and the second discharge check valve 242 opens, and the conveying medium 4 is forced out and conveyed outward. At the same time, the first drive chamber 12 switches to the low-pressure return state, the pressure of the drive liquid section 210 of the first U-tube 21 decreases, the isolation liquid 3 moves in the opposite direction, the first discharge check valve 232 of the first conveying unit 23 closes and the first feed check valve 231 opens, and the external conveying medium 4 is sucked into the first U-tube 21 to prepare for the next discharge. S4. Repeat S2 and S3. Through the continuous reversing drive of the symmetrical pump 11, the first U-tube 21 and the second U-tube 22 alternately complete the liquid discharge and liquid suction actions to realize the continuous and stable transportation of the medium 4. Until the transportation task is completed, the operation of the power unit 1 is stopped and the system enters the shutdown state.

[0043] Example 2: Based on the isolation liquid column driven special media conveying system of Example 1, a suitable isolation liquid 3 can be selected according to the physicochemical properties of different conveying media 4 to ensure density difference, chemical inertness and working condition requirements. Table 1 shows the isolation liquid selection examples for different conveying media: Table 1: Examples of Isolation Fluid Selection for Different Transport Media This embodiment 2 demonstrates that by selectively choosing the isolation fluid 3, the system can be adapted to the special media transportation needs of various fields such as petroleum, chemical, environmental protection, food, and medicine, achieving zero-contact, zero-pollution, and highly reliable transportation effects. Example 3:

[0044] like Figure 4As shown, based on the isolation liquid column driven special medium conveying system of Embodiment 1, when the diameters of the first medium pipeline of the first conveying unit 23 and the second medium pipeline of the second conveying unit 24 are large, a guide plate 6 can be set. The guide plate 6 can divide the conveying cross-section of the first medium pipeline and the second medium pipeline into multiple small channels, which can maintain interface stability.

[0045] In this embodiment 3, the flow guide plate 6 is selected to divide the conveying cross-section of the first medium pipeline and the second medium pipeline into multiple concentric ring channels. Example 4:

[0046] like Figure 5 As shown, based on Embodiment 3, the structure of the guide plate 6 is selected to divide the conveying cross-section of the first medium pipeline and the second medium pipeline into channels arranged in a radial pattern. Example 5:

[0047] like Figure 6 As shown, based on Embodiment 3, the structure of the guide plate 6 is selected to divide the conveying cross-section of the first medium pipeline and the second medium pipeline into channels arranged in a honeycomb shape. Example 6:

[0048] The interface stability experiments were conducted on the schemes in Examples 1, 4, and 5, and the results are shown in Table 2 below: Table 2: Comparison of the Influence of Different First and Second Medium Pipeline Inner Diameters and Baffle Types on the State of the Separating Fluid Interface This shows that in large-diameter conveying cavities, without the guide plate 6, fluid turbulence easily leads to interface fluctuations and entrainment / back-mixing. Adding radial or honeycomb guide plates 6 can effectively suppress turbulence, stabilize the fluid flow, and keep the interface flat. In contrast, small-diameter conveying cavities, due to the low Reynolds number of the fluid, can maintain a stable interface even without the guide plate 6. This comparison provides a clear basis for interface stability design under large-diameter operating conditions. Example 7:

[0049] To ensure the stability of the interface between the isolation fluid 3 and the conveying medium 4 during long-term reciprocating motion, this embodiment 7 controls the reciprocating motion frequency of the driving fluid 5, thereby controlling the flow state of the conveying medium 4 in the pipeline. This is typically categorized according to the Reynolds number Re, and the industry-standard criterion is as follows: Laminar flow range: When Re < 2000, the fluid flows in parallel layers with no lateral mixing, and the interface is stable, without entrainment or backmixing.

[0050] Transitional flow range: 2000≤Re<4000 The flow is unstable, sometimes laminar and sometimes turbulent, and the interface is prone to fluctuation.

[0051] Turbulent flow range: Re≥4000, the fluid is violently turbulent, generating eddies and local turbulence, and the interface is easily torn, entrained, and mixed.

[0052] Based on the above flow state classification, the interface of the medium in the pipeline under different flow states was compared and observed. The results are shown in Table 3 below: Table 3: Comparison Experiments under Different Flow Conditions It can be seen that under laminar flow conditions, the shear stress at the interface between the two phases is lower than the interfacial tension, which can effectively suppress interface fluctuations, entrainment and droplet entrainment, and ensure that the interface between the isolation liquid 3 and the transport medium 4 is clear and stable for a long time, thereby achieving reliable power transmission and near-zero leakage sealing.

[0053] 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 special media conveying system driven by an isolated liquid column, comprising a power unit (1), wherein the power unit (1) is connected to a process pipeline unit (2), characterized in that: The power unit (1) includes a symmetrical pump (11), which is provided with a first drive chamber (12) and a second drive chamber (13). The first drive chamber (12) is connected to a first delivery pipe (14), and the second drive chamber (13) is connected to a second delivery pipe (15). The process pipeline unit (2) includes a first U-shaped pipe (21) and a second U-shaped pipe (22) arranged symmetrically. The first delivery pipe (14) is connected to one end of the first U-shaped pipe (21), and the second delivery pipe (15) is connected to one end of the second U-shaped pipe (22). The other end of the first U-shaped pipe (21) is connected to the first delivery unit (23), and the other end of the second U-shaped pipe (22) is connected to the second delivery unit (24). Both the first U-shaped tube (21) and the second U-shaped tube (22) are configured as three-section structures: the two ends are respectively configured as driving liquid section (210) and conveying medium section (212), and the middle is configured as isolation liquid section (211). The first driving cavity (12), the second driving cavity (13), the first conveying pipe (14), the second conveying pipe (15) and the driving liquid section (210) are filled with driving liquid (5), the conveying medium section (212) is filled with conveying medium (4), and the isolation liquid section (211) is filled with isolation liquid (3). The isolation fluid (3) forms a liquid piston column. When it is stationary, it sinks to the bottom of the first U-tube (21) and the second U-tube (22) due to gravity, separating the driving fluid (5) and the conveying medium (4) on both sides. When the power unit (1) moves to push the driving fluid (5), the driving fluid (5) pushes one end of the liquid piston column, and the isolation fluid (3) moves smoothly in the pipeline. Its other end then pushes the conveying medium (4) to complete the intake and discharge.

2. The special media conveying system driven by an isolating liquid column according to claim 1, characterized in that: The first conveying pipe (14) is connected to the driving liquid section (210) of the first U-shaped pipe (21), and the first conveying unit (23) is connected to the conveying medium section (212) of the first U-shaped pipe (21).

3. The special media conveying system driven by an isolating liquid column according to claim 2, characterized in that: The second conveying pipe (15) is connected to the driving liquid section (210) of the second U-shaped pipe (22), and the second conveying unit (24) is connected to the conveying medium section (212) of the second U-shaped pipe (22).

4. The special media conveying system driven by an isolating liquid column according to claim 3, characterized in that: The first conveying unit (23) includes a first medium pipeline that is sealed to the driving liquid part (210) of the first U-tube (21). The outlet end of the first medium pipeline is connected to the first medium conveying pipeline. The first medium conveying pipeline is arranged perpendicular to the first medium pipeline.

5. The special media conveying system driven by an isolating liquid column according to claim 4, characterized in that: The first medium conveying pipeline is also connected to a first feed check valve (231) and a first discharge check valve (232). The first feed check valve (231) only allows the conveying medium (4) to flow into the conveying medium section (212) of the first U-tube (21) from the external conveying medium (4) pipeline, and the first discharge check valve (232) only allows the conveying medium (4) to be output from the first U-tube (21).

6. The special media conveying system driven by an isolating liquid column according to claim 5, characterized in that: The second medium pipeline is sealed and connected to the driving liquid part (210) of the second U-tube (22). The outlet end of the second medium pipeline is connected to the second medium conveying pipeline. The second medium conveying pipeline is arranged perpendicular to the second medium pipeline.

7. A special media conveying system driven by an isolating liquid column according to claim 6, characterized in that: The second medium conveying pipeline is also connected to a second feed check valve (241) and a second discharge check valve (242). The second feed check valve (241) only allows the conveying medium (4) to flow into the conveying medium section (212) of the second U-tube (22) from the external conveying medium (4) pipeline. The second discharge check valve (242) only allows the conveying medium (4) to be output from the second U-tube (22).

8. A special media conveying system driven by an isolating liquid column according to claim 7, characterized in that: The isolation fluid (3) is selected from perfluoropolyether oil, which has a density greater than that of the driving fluid (5) and the conveying medium (4). The driving fluid (5) is selected from commonly used lubricants.

9. A method for operating a special media conveying system driven by an isolation liquid column, using the special media conveying system driven by an isolation liquid column as described in any one of claims 1-8, characterized in that: Includes the following steps: S1. Drive fluid (5), isolation fluid (3) and conveying medium (4) are injected into the first U-tube (21) and the second U-tube (22) respectively. The density difference between the isolation fluid (3) and the drive fluid (5) and the conveying medium (4) is used to make the isolation fluid (3) form a liquid piston state. S2. Start the power unit (1), and the symmetrical pump (11) outputs driving fluid (5) to the first drive chamber (12). The driving fluid (5) enters the driving fluid part (210) of the first U-tube (21) through the first conveying pipe (14), pushing the isolation fluid (3) to move towards the conveying medium part (212). Under the pushing of the isolation fluid (3), the pressure in the first U-tube (21) increases, the first feed check valve (231) of the first conveying unit (23) closes, the first discharge check valve (232) opens, and the conveying medium (4) is forced out and conveyed outward. At the same time, the second drive chamber (13) is in a low-pressure return state, the pressure of the drive liquid part (210) of the second U-tube (22) decreases, the isolation liquid (3) moves in the opposite direction, the second discharge check valve (242) of the second conveying unit (24) closes and the second feed check valve (241) opens, and the external conveying medium (4) is sucked into the second U-tube (22) to complete the liquid suction process; S3, the symmetrical pump (11) reverses direction and outputs high-pressure driving fluid (5) to the second drive chamber (13). The driving fluid (5) enters the driving fluid section (210) of the second U-tube (22) through the second delivery pipe (15), pushing the isolation fluid (3) to move towards the conveying medium section (212). The pressure inside the second U-tube (22) increases, the second feed check valve (241) of the second delivery unit (24) closes, and the second discharge check valve (242) opens, so that the conveying medium (4) is forced out and conveyed outward. At the same time, the first drive chamber (12) switches to the low-pressure return state, the pressure of the drive liquid part (210) of the first U-tube (21) decreases, the isolation liquid (3) moves in the opposite direction, the first discharge check valve (232) of the first conveying unit (23) closes and the first feed check valve (231) opens, and the external conveying medium (4) is sucked into the first U-tube (21) to prepare for the next discharge; S4. Repeat S2 and S3. Through the continuous reversing drive of the symmetrical pump (11), the first U-tube (21) and the second U-tube (22) alternately complete the liquid discharge and liquid suction actions to realize the continuous and stable conveying of the conveying medium (4); until the conveying task is completed, the operation of the power unit (1) is stopped and the system enters the shutdown state.

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