Asymmetric wettability tubular memory alloy oil-water separation device and use method

Abstract

The invention relates to the technical field of oil-water separation, in particular to an asymmetric wettability tubular memory alloy oil-water separation device and a using method, and the asymmetric wettability tubular memory alloy oil-water separation device comprises an oil-in-water feeding pipe, an oil-in-water discharging pipe, a water-in-oil feeding pipe, a water-in-oil discharging pipe, asymmetric wettability tubular memory alloy pieces, magnetic suction sealing rings and electrode pieces, the asymmetric wettability tubular memory alloy sheet is of a three-layer composite structure with through micropores, a hydrophobic layer and a hydrophilic layer are arranged on the two sides of the asymmetric wettability tubular memory alloy sheet respectively, the shape memory effect can be triggered after the asymmetric wettability tubular memory alloy sheet is electrified and heated, and sheet body overturning is achieved; the magnetic attraction sealing ring is arranged along the central axis and can be synchronously separated and attracted again in the overturning process of the memory alloy piece, and dynamic switching of the pipeline sealing state is achieved. According to the device, the hydrophilic and hydrophobic properties of the inner surface and the outer surface of the separation channel can be quickly and automatically exchanged, so that continuous and accurate separation of oil-in-water and water-in-oil emulsion is adapted, and self-cleaning desorption of an intercepted phase can be realized in the overturning process, so that the maintenance cost can be reduced.

Description

Technical Field

[0001] This invention relates to the field of oil-water separation technology, specifically to an asymmetric wettability tubular shape memory alloy oil-water separation device and its usage method. Background Technology

[0002] In scenarios such as industrial oily wastewater treatment (e.g., machining, petrochemical industries), food processing liquid purification, and emergency oil spill recovery, efficient separation of oil-in-water and water-in-water emulsions is a core technological requirement. Because these emulsions have dispersed phase particle sizes in the micrometer range and exhibit strong system stability, traditional techniques such as gravity sedimentation and centrifugation suffer from low separation efficiency, high energy consumption, and inability to handle continuous processes. Tubular membrane separation, with its advantages of small footprint, high separation precision, and large processing capacity, has become the mainstream technical solution in this field.

[0003] Existing tubular oil-water separators generally employ a static wettability design: either with a hydrophilic inner wall and a hydrophobic outer wall (suitable only for oil-in-water systems), or a hydrophobic inner wall and a hydrophilic outer wall (suitable only for water-in-oil systems). However, in actual industrial conditions, the type of emulsion to be treated often changes dynamically—for example, machining workshops need to alternately treat machine tool coolant (oil-in-water type) and leaking machine oil (water-in-oil type); fluctuations in the oil phase ratio in petrochemical wastewater treatment can also lead to changes in emulsion type. In these cases, static wettability membranes require shutdown, disassembly, and replacement, which not only interrupts continuous production processes but also increases equipment maintenance costs and operational complexity, making them unsuitable for dynamic operating conditions.

[0004] To address these issues, some studies have attempted to optimize membrane wettability through surface modification (such as grafting responsive polymers). However, these approaches often rely on complex external controls (such as pH, temperature, and light) and can only achieve unidirectional wettability switching, failing to accommodate both oil-in-water and water-in-oil dual systems. Other approaches employ a bilayer composite structure, but suffer from poor interlayer bonding, susceptibility to peeling failure under operating pressure, and an inability to achieve coordinated reverse adjustment of wettability between the inside and outside of the membrane. Furthermore, existing tubular oil-water separation membranes tend to retain a trapped phase (such as the oil phase) on their surface, requiring regular manual cleaning and maintenance over long-term use; otherwise, micropore blockage can easily occur, reducing membrane separation performance.

[0005] In summary, existing tubular separation membranes, due to their fixed or complex wettability control and lack of simple and efficient driving methods, struggle to meet the continuous separation requirements of various types of emulsions under dynamic operating conditions. There is an urgent need to develop a tubular shape memory alloy separation device that can achieve precise reverse adjustment of wettability inside and outside the membrane without disassembly, thereby improving separation efficiency and adaptability to operating conditions and lowering the barrier to industrial application.

[0006] In view of the above-mentioned defects, the inventors of this invention have finally obtained this invention after a long period of research and practice. Summary of the Invention

[0007] The purpose of this invention is to solve the problem that existing tubular separation membranes, due to their fixed or complex wettability control and lack of simple and efficient driving methods, cannot meet the continuous separation requirements of various types of emulsions under dynamic operating conditions. This invention provides an asymmetric wettability tubular shape memory alloy oil-water separation device and its usage method.

[0008] To achieve the above objectives, this invention discloses an asymmetric wettable tubular shape memory alloy oil-water separation device, comprising an oil-in-water feed pipe, an oil-in-water discharge pipe, an oil-in-water feed pipe, an oil-in-water discharge pipe, an asymmetric wettable tubular shape memory alloy sheet, a magnetic sealing ring, and electrode plates. The oil-in-water feed pipe and the oil-in-water feed pipe are located at one end of the asymmetric wettable tubular shape memory alloy sheet, and the oil-in-water discharge pipe and the oil-in-water discharge pipe are located at the other end of the asymmetric wettable tubular shape memory alloy sheet. The magnetic sealing ring is arranged along the central axis, with one end located between the oil-in-water feed pipe and the oil-in-water feed pipe, and the other end located between the oil-in-water discharge pipe and the oil-in-water discharge pipe. The asymmetric wettable tubular shape memory alloy sheet is connected to the magnetic sealing ring, and the electrode plates are located at both ends of the asymmetric wettable tubular shape memory alloy sheet.

[0009] The water-in-oil feed pipe, the oil-in-water feed pipe, the water-in-oil discharge pipe, and the oil-in-water discharge pipe are all connected by a flat pipe clamp to prevent pipe displacement.

[0010] The asymmetric wet tubular shape memory alloy sheet includes a porous shape memory alloy substrate, a hydrophobic PTFE layer, and a hydrophilic acrylic layer. The hydrophobic PTFE layer and the hydrophilic acrylic layer are respectively disposed on both sides of the porous shape memory alloy substrate, forming an electro-responsive driving unit.

[0011] The porous shape memory alloy substrate has multiple through-holes on its surface. Both the hydrophobic PTFE layer and the hydrophilic acrylic layer have through-holes that are opposite in diameter and perfectly aligned with the through-holes, so that the entire asymmetric wetted tubular shape memory alloy sheet forms a three-layer composite structure with through-holes on the entire surface.

[0012] The porous shape memory alloy substrate has a thickness of 0.1~1.5mm, the through-pores have a pore size of 0.5~0.8μm, the hydrophobic PTFE layer has a thickness of 10~50nm, and the hydrophilic acrylic layer has a thickness of 50~100nm.

[0013] The porous shape memory alloy substrate is a two-pass shape memory alloy.

[0014] The magnetic sealing ring includes a sealing ring and a magnetic sheet. The sealing ring has fitting grooves at both ends that are adapted to the magnetic sheet. The magnetic sheet is embedded in both ends of the sealing ring and the magnetic force ensures initial fit and sealing. The inner ring of the sealing ring has a groove that matches the asymmetric wetting tubular shape memory alloy sheet to ensure tight fit and reliable electrical response switching.

[0015] The present invention also discloses a method for using the above-mentioned asymmetric wettability tubular shape memory alloy oil-water separation device, including two electrical response switching modes: inner wall hydrophobic-outer wall hydrophilic and inner wall hydrophilic-outer wall hydrophobic.

[0016] The specific steps for the switching mode of hydrophobic inner wall and hydrophilic outer wall are as follows:

[0017] S1. The oil-in-water emulsion to be treated is connected to the oil-in-water feed pipe. The asymmetric wetting tubular shape memory alloy sheet is adjusted to a tubular shape with "hydrophobic inner wall and hydrophilic outer wall", so that it tightly wraps the oil-in-water feed pipe and the oil-in-water discharge pipe, and the oil-in-water separation operation is started (the water phase passes through the hydrophilic outer layer, and the oil phase is trapped by the hydrophobic inner layer).

[0018] S2, when the system to be treated is switched to a water-in-oil emulsion, it is connected to the water-in-oil feed pipe, and electricity is applied to the electrode plate. The asymmetric wetted tubular shape memory alloy sheet is heated, triggering the shape memory effect and driving the magnetic sealing ring to disengage from the attracted state. With continuous heating, the asymmetric wetted tubular shape memory alloy sheet flips to a tubular posture with a "hydrophilic inner wall and hydrophobic outer wall". The magnetic sealing ring re-attracts and tightly wraps the water-in-oil feed pipe and the water-in-oil discharge pipe, completing the electro-response switching of the filtration type and starting the water-in-oil separation operation (the oil phase permeates through the hydrophobic outer layer, and the water phase is trapped by the hydrophilic inner layer). The asymmetric wetted tubular shape memory alloy sheet generates significant surface shear force and micro-vibration during large-scale mechanical deformation (flipping and bending). The synergistic effect of these two factors can effectively destroy the adhesion of the trapped phase on the membrane surface, so that the flipping action synchronously drives the desorption of the trapped phase, without the need for chemical cleaning during shutdown.

[0019] The specific steps for the switching mode of hydrophilic inner wall and hydrophobic outer wall electrical response are as follows:

[0020] A1. The oil-in-water emulsion to be treated is connected to the oil-in-water feed pipe. The asymmetric wetting tubular shape memory alloy sheet is adjusted to a tubular shape with "hydrophilic inner wall and hydrophobic outer wall", so that it tightly wraps the oil-in-water feed pipe and the oil-in-water discharge pipe, and the oil-in-water separation operation is started (the oil phase passes through the hydrophobic outer layer, and the water phase is trapped by the hydrophilic inner layer).

[0021] A2, when the system to be processed is switched to an oil-in-water emulsion, it is connected to the oil-in-water feed pipe and energized to the electrode plate. The asymmetric wetted tubular shape memory alloy sheet is deformed by heat, and the resulting torque and radial displacement drive the magnetic sealing ring to disengage from the attraction state. When the shape memory alloy sheet completes to flip to the new tubular posture, its edge pushes the two ends of the magnetic sealing ring to realign. The asymmetric wetted tubular shape memory alloy sheet returns to the tubular posture of "hydrophobic inner wall and hydrophilic outer wall". The magnetic force automatically causes the magnetic sealing ring to re-attract and wrap around the oil-in-water feed pipe and the oil-in-water discharge pipe, completing the electro-response switching of the filtration type and starting the oil-in-water separation operation (the water phase passes through the hydrophilic outer layer, and the oil phase is trapped by the hydrophobic inner layer).

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. "Electro-Shape-Lubrication" Triad Dynamic Response: Compared with static membranes which require machine shutdown for membrane replacement, this invention drives the deformation of the shape memory alloy substrate to synchronously and automatically achieve reverse adjustment of the wettability of the inner and outer wall surfaces, adapting to emulsion type switching without interrupting production;

[0024] 2. Using electricity as the control method, no additional temperature control or chemical reagents are required, thus avoiding the complex condition dependence of traditional responsive membranes;

[0025] 3. It achieves an integrated design of "separation-desorption", and the wettability can be adjusted according to the separation target. By utilizing the physical and mechanical effect of the flipping action, it achieves synchronous in-situ desorption of the retained phase, breaking through the traditional membrane fouling and cleaning problem, greatly improving durability and operability, and reducing maintenance costs.

[0026] 4. Synergistic protection of structure, function and sealing: The separation accuracy is guaranteed by a three-layer composite through structure, and the mechanical linkage between the shape memory alloy sheet and the magnetic sealing ring ensures reliable operation and tight sealing. The tubular structure and integrated design have a small footprint and can be directly embedded into the existing industrial pipeline system, reducing the cost of transformation. Attached Figure Description

[0027] Figure 1 This is a cross-sectional schematic diagram of the asymmetric wettability tubular shape memory alloy oil-water separation device of the present invention;

[0028] Figure 2 This is a schematic diagram of the "hydrophilic inner wall and hydrophobic outer wall" orientation structure of the asymmetric wettability tubular shape memory alloy oil-water separation device of the present invention.

[0029] Figure 3 This is a schematic diagram of the intermediate transition posture structure of the asymmetric wettability tubular shape memory alloy oil-water separation device in this invention.

[0030] Figure 4This is a schematic diagram of the asymmetric wettability tubular shape memory alloy oil-water separation device of the present invention, showing a "hydrophobic inner wall and hydrophilic outer wall" orientation structure.

[0031] The numbers in the diagram represent:

[0032] 1-Straight pipe clamp; 2-Water-in-oil feed pipe; 3-Oil-in-water feed pipe; 4-Water-in-oil discharge pipe; 5-Oil-in-water discharge pipe; 6-Asymmetric wetting tubular shape memory alloy sheet; 6-1-Hydrophobic PTFE layer; 6-2-Hydrophilic acrylic layer; 6-3-Porous shape memory alloy substrate; 7-Magnetic sealing ring; 7-1-Magnetic sheet; 7-2-Sealing ring; 8-Electrode sheet. Detailed Implementation

[0033] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.

[0034] Example 1

[0035] This embodiment provides an asymmetric wettable tubular shape memory alloy oil-water separation device, including an oil-in-water inlet pipe 2, an oil-in-water outlet pipe 4, an oil-in-water inlet pipe 3, an oil-in-water outlet pipe 5, an asymmetric wettable tubular shape memory alloy sheet 6, a magnetic sealing ring 7, and electrode plates 8. The oil-in-water inlet pipe 2 and the oil-in-water inlet pipe 3 are located at one end of the asymmetric wettable tubular shape memory alloy sheet 6, and the oil-in-water outlet pipe 4 and the oil-in-water outlet pipe 5 are located at the other end of the asymmetric wettable tubular shape memory alloy sheet 6. The magnetic sealing ring 7 is arranged along the central axis, with one end located between the oil-in-water inlet pipe 2 and the oil-in-water inlet pipe 3, and the other end located between the oil-in-water outlet pipe 4 and the oil-in-water outlet pipe 5. The asymmetric wettable tubular shape memory alloy sheet 6 is connected to the magnetic sealing ring 7, and the electrode plates 8 are located at both ends of the asymmetric wettable tubular shape memory alloy sheet 6.

[0036] The water-in-oil feed pipe 2 and the oil-in-water feed pipe 3, the water-in-oil discharge pipe 4 and the oil-in-water discharge pipe 5 are all connected by a flat pipe clamp 1.

[0037] The asymmetric wet tubular shape memory alloy sheet 6 includes a porous shape memory alloy substrate 6-3, a hydrophobic PTFE layer 6-1, and a hydrophilic acrylic layer 6-2, wherein the hydrophobic PTFE layer 6-1 and the hydrophilic acrylic layer 6-2 are respectively disposed on both sides of the porous shape memory alloy substrate 6-3.

[0038] The porous shape memory alloy substrate 6-3 has multiple through-holes on its surface. The hydrophobic PTFE layer 6-1 and the hydrophilic acrylic layer 6-2 both have through-holes that are opposite in diameter and perfectly aligned with the through-holes, so that the entire asymmetric wetted tubular shape memory alloy sheet 6 forms a three-layer composite structure with through-holes on the entire surface.

[0039] The porous shape memory alloy substrate 6-3 has a thickness of 0.1~1.5mm, the pore size of the through micropores is 0.5~0.8μm, the thickness of the hydrophobic PTFE layer 6-1 is 10~50nm, and the thickness of the hydrophilic acrylic layer 6-2 is 50~100nm.

[0040] The porous shape memory alloy substrate 6-3 is a two-pass shape memory alloy.

[0041] The magnetic sealing ring 7 includes a sealing ring 7-2 and a magnetic sheet 7-1. The sealing ring 7-2 has fitting grooves at both ends that are adapted to the magnetic sheet 7-1. The inner ring of the sealing ring 7-2 has a groove that matches the asymmetric wetting tubular shape memory alloy sheet 6.

[0042] The asymmetric wettability tubular shape memory alloy oil-water separation device in this embodiment can separate raw material systems as follows: water-in-oil type industrial emulsion with a dispersed phase particle size of 1~10μm, or oil-in-water type industrial emulsion with a dispersed phase particle size of 5~20μm.

[0043] Example 2

[0044] This embodiment provides a method for using an asymmetric wettability tubular shape memory alloy oil-water separation device (water-in-oil → oil-in-water electro-responsive switching):

[0045] Step 1: Introduce the oil-in-water emulsion (dispersed phase particle size 1-10μm) into the oil-in-water feed pipe 2. Adjust the asymmetric wetting tubular shape memory alloy sheet 6 to a tubular orientation with "hydrophobic inner wall (hydrophobic PTFE layer 6-1 facing inward) and hydrophilic outer wall (hydrophilic acrylic layer 6-2 facing outward)," so that it tightly wraps around the oil-in-water feed pipe 2 and the oil-in-water discharge pipe 4. At this time, the magnetic sealing ring 7 is tightly attracted by magnetic force to ensure the pipeline is sealed. Start the feed pump. When the oil-in-water emulsion flows through the asymmetric wetting tubular shape memory alloy sheet 6, the water phase permeates through the hydrophilic acrylic layer 6-2, and the oil phase is intercepted by the hydrophobic PTFE layer 6-1. After separation, the water phase is discharged from the oil-in-water discharge pipe 4, completing the oil-in-water separation.

[0046] Step 2: When the system to be processed is switched to water-in-oil emulsion (dispersed phase particle size 5-20μm), first turn off the feed pump and connect the water-in-oil emulsion to the water-in-oil feed pipe 3; energize the electrode plate 8, the electrode plate 8 heats up and conducts the heat to the porous shape memory alloy substrate 6-3, the substrate is heated and triggers the shape memory effect, and begins to deform in the "flipping" direction. During the deformation process, the magnetic sealing ring 7 overcomes the magnetic force and disengages from the attraction state; continue to energize until the deformation is completed, the asymmetric wetted tubular shape memory alloy plate 6 is completely flipped to a tubular posture with "hydrophilic inner wall (hydrophilic acrylic layer 6-2 facing inward) and hydrophobic outer wall (hydrophobic PTFE layer 6-1 facing outward)", at this time the magnetic sealing ring 7 re-attracts and tightly wraps the water-in-oil feed pipe 3 and the water-in-oil discharge pipe 5. With the electrode plate 8 de-energized and the feed pump started, when the water-in-oil emulsion flows through the asymmetrically wetted tubular shape memory alloy sheet 6, the oil phase permeates through the hydrophobic PTFE layer 6-1, while the aqueous phase is retained by the hydrophilic acrylic layer 6-2. After separation, the oil phase is discharged from the water-in-oil outlet pipe 5, completing the electro-response switching and water-in-oil separation. The asymmetrically wetted tubular shape memory alloy sheet 6 generates significant surface shear force and micro-vibration due to large-scale mechanical deformation (flipping and bending). The synergistic effect of these two factors effectively breaks the adhesion of the retained phase on the membrane surface (the surface of the PTFE layer 6-1 or the acrylic layer 6-2), allowing the flipping action to synchronously drive the desorption of the retained phase without the need for chemical cleaning during machine shutdown.

[0047] Example 3

[0048] This embodiment provides a method for using an asymmetric wettability tubular shape memory alloy oil-water separation device (oil-in-water → water-in-oil electro-responsive switching):

[0049] Step 1: Connect the water-in-oil emulsion to be treated into the water-in-oil feed pipe 3, adjust the asymmetric wetting tubular shape memory alloy sheet 6 to a tubular shape with "hydrophilic inner wall and hydrophobic outer wall", so that it tightly wraps the water-in-oil feed pipe 3 and the water-in-oil discharge pipe 5, and the magnetic sealing ring 7 is attracted and sealed; start the feed pump, when the emulsion flows through the asymmetric wetting tubular shape memory alloy sheet 6, the oil phase permeates through the hydrophobic outer layer, and the water phase is intercepted by the hydrophilic inner layer, thus completing the water-in-oil separation.

[0050] Step 2: When the system to be processed is switched to an oil-in-water emulsion, turn off the feed pump and connect the oil-in-water emulsion to the oil-in-water feed pipe 2; energize the electrode plate 8, the porous shape memory alloy substrate 6-3 deforms due to heat, and at the same time, the asymmetric wetted tubular shape memory alloy sheet 6 deforms due to heat. The resulting torque and radial displacement drive the magnetic sealing ring 7 to disengage from the attraction state; continue energizing until the asymmetric wetted tubular shape memory alloy sheet 6 flips to a new tubular posture, its edges push the magnetic sealing ring 7 to the left and right. The ends are repositioned, and the asymmetric wetted tubular shape memory alloy sheet 6 is transformed into a tubular posture with "hydrophobic inner wall and hydrophilic outer wall". The magnetic force automatically causes the magnetic sealing ring 7 to re-attract and wrap the oil-in-water feed pipe 2 and the oil-in-water discharge pipe 4. The electrode sheet 8 is de-energized and the feed pump is started. When the oil-in-water emulsion flows through the asymmetric wetted tubular shape memory alloy sheet 6, the water phase permeates through the hydrophilic acrylic layer 6-2, and the oil phase is intercepted by the hydrophobic PTFE layer 6-1, completing the oil-in-water separation and realizing the electrical response switching.

[0051] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. An asymmetric wetting tubular memory alloy oil-water separation device, characterized in that, The application relates to a water-in-oil inlet pipe, a water-in-oil outlet pipe, a water-in-oil inlet pipe, a water-in-oil outlet pipe, an asymmetric wetting tubular memory alloy sheet, a magnetic sealing ring and an electrode sheet, wherein the water-in-oil inlet pipe and the water-in-oil outlet pipe are arranged at one end of the asymmetric wetting tubular memory alloy sheet, the water-in-oil outlet pipe and the water-in-oil outlet pipe are arranged at the other end of the asymmetric wetting tubular memory alloy sheet, the magnetic sealing ring is arranged along a central axis, one end of the magnetic sealing ring is arranged between the water-in-oil inlet pipe and the water-in-oil outlet pipe, the other end of the magnetic sealing ring is arranged between the water-in-oil outlet pipe and the water-in-oil outlet pipe, the asymmetric wetting tubular memory alloy sheet is connected with the magnetic sealing ring, and the electrode sheet is arranged at both ends of the asymmetric wetting tubular memory alloy sheet.

2. The tubular shape memory alloy oil-water separation device with asymmetric wetting property according to claim 1, wherein, The water-in-oil inlet pipe, the water-in-oil outlet pipe, the water-in-oil inlet pipe and the water-in-oil outlet pipe are connected through flat pipe clamps.

3. The tubular shape memory alloy oil-water separation device with asymmetric wetting property according to claim 1, wherein, The asymmetric wetting tubular memory alloy sheet comprises a porous memory alloy base, a hydrophobic PTFE layer and a hydrophilic acrylic layer, and the hydrophobic PTFE layer and the hydrophilic acrylic layer are arranged on the two sides of the porous memory alloy base.

4. The tubular shape memory alloy oil-water separation device with asymmetric wetting property according to claim 3, wherein, The surface of the porous memory alloy base is provided with a plurality of through micropores, the hydrophobic PTFE layer and the hydrophilic acrylic layer are provided with through holes which are opposite to the through micropores and are completely aligned with the through micropores, and the whole asymmetric wetting tubular memory alloy sheet forms a three-layer composite structure with the through holes penetrating the whole surface.

5. The tubular shape memory alloy oil-water separation device with asymmetric wetting property according to claim 4, wherein, The thickness of the porous memory alloy base is 0.1-1.5 mm, the diameter of the through micropores is 0.5-0.8 mu m, the thickness of the hydrophobic PTFE layer is 10-50 nm, and the thickness of the hydrophilic acrylic layer is 50-100 nm.

6. The tubular shape memory alloy oil-water separation device with asymmetric wetting property according to claim 3, wherein, The porous memory alloy base is a double-path formed memory alloy.

7. The asymmetric wetting tubular shape memory alloy oil-water separation device of claim 1, wherein, The magnetic sealing ring comprises a sealing ring and a magnetic sheet, the two ends of the sealing ring are provided with embedded grooves matched with the magnetic sheet, the magnetic sheet is embedded in the two ends of the sealing ring, and the inner ring of the sealing ring is provided with a groove matched with the asymmetric wetting tubular memory alloy sheet.

8. A method of using the asymmetric wetting tubular memory alloy oil-water separation device according to any one of claims 1-7, characterized in that, The application comprises two electric response switching modes, i.e. an inner wall hydrophobic-outer wall hydrophilic mode and an inner wall hydrophilic-outer wall hydrophobic mode.

9. The method of using an asymmetric wetting tubular memory alloy oil-water separation device of claim 8, wherein, The specific steps of the inner wall hydrophobic-outer wall hydrophilic electric response switching mode are as follows: S1, the water-in-oil emulsion to be treated is connected to the water-in-oil inlet pipe, the asymmetric wetting tubular memory alloy sheet is adjusted to the tubular posture of "inner wall hydrophobic and outer wall hydrophilic", the asymmetric wetting tubular memory alloy sheet is tightly wrapped around the water-in-oil inlet pipe and the water-in-oil outlet pipe, and the water-in-oil separation operation is started; S2, when the system to be treated is switched to a water-in-oil emulsion, the water-in-oil emulsion is connected to the water-in-oil inlet pipe, the electrode sheet is electrified, the asymmetric wetting tubular memory alloy sheet triggers the shape memory effect after being heated, the magnetic sealing ring is driven to separate from the attraction state, the asymmetric wetting tubular memory alloy sheet is continuously heated and electrified, the asymmetric wetting tubular memory alloy sheet is turned to the tubular posture of "inner wall hydrophilic and outer wall hydrophobic", the magnetic sealing ring is re-attracted and tightly wrapped around the water-in-oil inlet pipe and the water-in-oil outlet pipe, the electric response switching of the filter type is completed, and the water-in-oil separation operation is started.

10. The method of using an asymmetric wetting tubular memory alloy oil-water separation device of claim 8, wherein, The specific steps of the inner wall hydrophilic-outer wall hydrophobic electric response switching mode are as follows: A1, the water-in-oil emulsion to be treated is connected to the water-in-oil inlet pipe, the asymmetric wetting tubular memory alloy sheet is adjusted to the tubular posture of "hydrophilic inner wall and hydrophobic outer wall", and it is tightly wrapped around the water-in-oil inlet pipe and the water-in-oil outlet pipe, and the water-in-oil separation operation is started; A2, when the system to be treated is switched to an oil-in-water emulsion, it is connected to the oil-in-water inlet pipe, and the electrode sheet is powered on. The asymmetric wetting tubular memory alloy sheet is deformed by heat, generating a torsional force and a radial displacement to drive the magnetic attraction sealing ring out of the attraction state. When the memory alloy sheet completes the flip to the new tubular posture, its edge pushes the two ends of the magnetic attraction sealing ring to reposition. The asymmetric wetting tubular memory alloy sheet returns to the tubular posture of "hydrophobic inner wall and hydrophilic outer wall". The magnetic force automatically causes the magnetic attraction sealing ring to re-attract and wrap the oil-in-water inlet pipe and the oil-in-water outlet pipe, completing the filter type electrical response switching, and starting the oil-in-water separation operation.

Images