A microfluidic pressure relief valve based on electrically braked PVC gel

Abstract

The application discloses a micro fluid pressure relief valve based on electric braking PVC gel, and relates to the technical field of pressure relief valves.The micro fluid pressure relief valve comprises an electrode seat, electrodes and a PVC gel valve core, the electrode seat comprises a cross electrode seat and a ring electrode seat, the electrodes comprise cross electrodes and ring electrodes, the cross electrodes are installed in the interiors of the cross electrode seats, the ring electrodes are installed in the interiors of the ring electrode seats, a step is arranged in the cross electrode seat, and the ring electrode seat is installed on the step, so that the cross electrodes and the ring electrodes are oppositely arranged and the PVC gel valve core is clamped in the middle parts of the cross electrodes and the ring electrodes.The PVC gel valve core comprises a cylindrical support body, the bottom of the cylindrical support body is inwardly recessed to form a bowl-shaped structure, and the bottom edge of the cylindrical support body extends outward to form a skirt.The application solves the hard problems of large volume and large weight in the prior art, realizes miniaturization and system integration, and provides the possibility for realizing a more complex and fine micro-fluid operation system and wider application.

Description

Technical Field

[0001] The invention relates to the technical field of pressure relief valves, and in particular to a micro fluid pressure relief valve based on electric braking PVC gel. Background Art

[0002] Microfluidics technology, due to its unique advantages in controlling fluid behavior, processing micro- and nanoscale fluids, and efficient analysis, is widely used in the development of microscale chips, drug screening, catalytic reaction research, and other fields. Fluid pressure relief valves, as key components of control systems, play an indispensable role. To achieve microscale pipeline fluid pressure control and provide stable pipeline operating pressure, relying solely on fluid pumps and pressure regulating valves is unreliable. Therefore, a pressure relief valve is required within the pipeline to provide a threshold to ensure stable pressure.

[0003] However, traditional fluid pressure relief valves are mostly spring-loaded and lever-type. Due to the hardware requirements of springs and weights, they are generally large and heavy, making them unsuitable for the increasingly miniaturized and modular microfluidic control systems. Furthermore, existing fluid pressure relief valves require manual adjustment of spring compression to adjust the operating pressure in the pipeline, and frequent adjustments can damage the sealing surface, making them unsuitable for precise flow control and complex microfluidic control systems. Finally, due to their low sensitivity, traditional pressure relief valves have difficulty achieving effective pressure relief in low-pressure systems. Summary of the Invention

[0004] The main purpose of the present invention is to provide a micro fluid pressure relief valve based on electric brake PVC gel to overcome the problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A micro fluid pressure relief valve based on electrically braked PVC gel, comprising an electrode holder, an electrode, and a PVC gel valve core. The electrode holder comprises a cross electrode holder and a ring electrode holder, and the electrodes comprise a cross electrode and a ring electrode. The cross electrode is mounted within the cross electrode holder, and the ring electrode is mounted within the ring electrode holder. A step is provided within the cross electrode holder for assembling, positioning, and fixing the ring electrode holder. After the ring electrode holder is mounted on the step, the cross electrode and the ring electrode are positioned relative to each other, with the middle portion thereof clamping the PVC gel valve core. The PVC gel valve core comprises a cylindrical support body, the bottom of the cylindrical support body being concave inwardly to form a bowl-shaped structure, and the bottom edge of the cylindrical support body extending outwardly to form a skirt.

[0007] The PVC gel valve core uses a gel material with a ratio of PVC:DBA = 1:9, and is prepared by mold casting and solvent volatilization. The gel material of the PVC gel valve core contains a high content of plasticizer DBA. The interaction between PVC and plasticizer DBA produces a huge dielectric constant. Under the action of high voltage, the gel surface will produce a high degree of polarization, attracting the metal electrode and ultimately generating electrostatic adhesion. Through voltage adjustment, the PVC gel valve core will change the electrostatic adhesion force on the annular electrode, thereby regulating the pipeline safety pressure.

[0008] Furthermore, the cross electrode seat and the ring electrode seat are both provided with interfaces at one end away from each other, the interface on the cross electrode seat is a first interface, and the interface on the ring electrode seat is a second interface, the first interface and the second interface are both used to connect external pipelines, a first through hole is provided on one side of the first interface on the cross electrode seat, and a second through hole is provided on one side of the second interface on the ring electrode seat, and conductive wires are buried in the first through hole and the second through hole.

[0009] Furthermore, four positioning slots are provided on the step, and the positioning slots are used for assembling, positioning and constraining the cross electrode.

[0010] Furthermore, a cylinder is provided in the middle portion of the cross electrode, and the cylinder is in contact with the cylindrical support.

[0011] Furthermore, the annular electrode is formed by rotating a triangle around an axis, and a third through hole for fluid to pass through is provided in the middle portion of the annular electrode. The inner side of the annular electrode is provided as an inclined side surface, and a plurality of grooves are arranged at intervals on the inclined side surface. The inclined side surface is in direct contact with the PVC gel valve core. When voltage is connected, the gel is adhered to the inclined side surface to completely block the third through hole to achieve pipeline closure.

[0012] Furthermore, after applying voltage, the skirt of the PVC gel valve core gradually fits the oblique side surface of the annular electrode and continuously creeps and deforms until the skirt is fully stretched and adheres to the oblique side surface. At this time, the pipeline is closed, and then the fluid causes pressure on the bowl-shaped structure at the bottom of the PVC gel valve core. Due to the high elastic modulus of the gel material, the bowl-shaped structure expands under the action of pressure, carrying the fluid without allowing it to flow. When the pipeline pressure exceeds the limit adhesion force of the PVC gel valve core, a part of the skirt is lifted up, and a gap is generated between it and the oblique side surface, and the pressure is released. Then the bowl-shaped structure tends to return to its original shape, and the part of the skirt that is still adhered will creep and spread toward the lifted skirt, so that all the skirts return to the adhered state, and the pipeline returns to the open circuit state.

[0013] Furthermore, the cross electrode, the ring electrode and the conductive wire connected to the external voltage are all made of platinum, copper or silver, wherein the cross electrode and the ring electrode are made of the same material, and the conductive wire is connected to the cross electrode and the ring electrode respectively by soldering.

[0014] Furthermore, the interiors of the first through hole and the second through hole are filled with photosensitive resin through conductive wires and are encapsulated by UV curing. The surface of the inner cavity of the annular electrode seat in contact with the annular electrode is coated with a thin layer of photosensitive resin. After the two are assembled, they are encapsulated by UV curing. After the annular electrode seat is installed on the step of the cross electrode seat, the outer side of the connection is coated with photosensitive resin and encapsulated by UV curing.

[0015] Furthermore, the upper tip edge of the annular electrode is chamfered, and the lower inner edge is chamfered.

[0016] Furthermore, after power is turned on, the PVC gel valve core, the ring electrode and the cross electrode will directly contact the pipeline fluid, and the fluid is selected from vegetable oil, kerosene or air.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The PVC gel valve core is made of gel material. The voltage is adjusted to control the PVC gel valve core to produce different degrees of creep deformation, thereby adjusting the electrostatic adhesion force. The adhesion force offsets the air pressure to achieve pipeline opening and closing and adjust the safety pressure. Since it only relies on PVC gel as the valve core, its structure is simplified and smaller in size to solve the rigid problems of large volume and heavy weight in the existing technology, realizing miniaturization and system integration, and providing the possibility of realizing more complex and sophisticated microfluidic operating systems and wider applications. The micro fluid pressure relief valve is designed for low-pressure systems and can release overpressure while minimizing fluid loss, thereby achieving effective pressure relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the structural decomposition of the present invention.

[0021] Figure 3 It is a half-section view of the cross electrode holder of the present invention.

[0022] Figure 4 It is a side view of the cross electrode holder of the present invention.

[0023] Figure 5 It is a half-section view of the annular electrode seat of the present invention.

[0024] Figure 6 It is a side view of the annular electrode seat of the present invention.

[0025] Figure 7 Schematic diagram of the cross electrode structure of the present invention.

[0026] Figure 8 It is a side view of the cross electrode of the present invention.

[0027] Figure 9 It is a half-section view of the annular electrode of the present invention.

[0028] Figure 10 This is a top view of the annular electrode of the present invention.

[0029] Figure 11 It is a three-dimensional diagram of the ring electrode of the present invention.

[0030] Figure 12 This is a half-section view of the PVC gel valve core of the present invention.

[0031] Figure 13 This is a schematic diagram of the operating principle of the micro fluid pressure relief valve of the present invention.

[0032] Description of the accompanying drawings: 1. Electrode seat; 2. Electrode; 3. PVC gel valve core; 4. Cross electrode seat; 5. Ring electrode seat; 6. Spring; 7. First interface; 8. First through hole; 9. Step; 10. Positioning groove; 11. Cross electrode; 12. Second interface; 13. Second through hole; 14. Ring electrode; 15. Third through hole; 16. Oblique side; 17. Groove; 18. Cylinder; 19. Skirt; 20. Cylindrical support body; 21. Bowl-shaped structure; 22. Welding point; 23. Chamfered corner; 24. Chamfered corner. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0034] Combine Figures 1 to 11 The present embodiment provides a micro fluid pressure relief valve based on electric braking PVC gel, comprising an electrode holder 1, an electrode 2 and a PVC gel valve core 3. The electrode holder 1 comprises a cross electrode holder 4 and a ring electrode holder 5. The electrode 2 comprises a cross electrode 11 and a ring electrode 14. The cross electrode 11 is mounted inside the cross electrode holder 4, and the ring electrode 14 is mounted inside the ring electrode holder 5. A step 9 for assembling, positioning and fixing the ring electrode holder 5 is provided inside the cross electrode holder 4. After the ring electrode holder 5 is mounted on the step 9, the cross electrode 11 and the ring electrode 14 are placed opposite to each other and the middle part of the two clamps the PVC gel valve core 3. The PVC gel valve core 3 comprises a cylindrical support body 20. The bottom of the cylindrical support body 20 is concave inward to form a bowl-shaped structure 21. The bottom edge of the cylindrical support body 20 extends outward to form a skirt 19.

[0035] The PVC gel valve core 3 is made of a gel material with a ratio of PVC to DBA of 1:9. It is formed by mold casting and solvent evaporation. The gel material of the PVC gel valve core 3 contains a high content of the plasticizer DBA. The interaction between the PVC and the plasticizer DBA produces a large dielectric constant. Under high voltage, the gel surface becomes highly polarized, attracting the metal electrode and ultimately generating electrostatic adhesion. By adjusting the voltage, the PVC gel valve core 3 changes the electrostatic adhesion force to the annular electrode 14, thereby regulating the pipeline safety pressure.

[0036] In this embodiment, the cross electrode seat 4 and the annular electrode seat 5 are both provided with interfaces at the ends away from each other. The interface on the cross electrode seat 4 is the first interface 7, and the interface on the annular electrode seat 5 is the second interface 12. The first interface 7 and the second interface 12 are both used to connect external pipelines. A first through hole 8 is provided on one side of the first interface 7 on the cross electrode seat 4, and a second through hole 13 is provided on one side of the second interface 12 on the annular electrode seat 5. Conductive wires 6 are buried in the first through hole 8 and the second through hole 13.

[0037] Preferably, four positioning slots 10 are provided on the step 9, and the positioning slots 10 are used to assemble, position and constrain the cross electrode 11. In specific use, the cross electrode 11 can slide on the positioning slots 10 to flexibly change the gap between the two electrodes.

[0038] In this embodiment, a cylinder 18 is provided in the middle of the cross electrode 11, and the cylinder 18 is in contact with the cylindrical support 20. During operation, the main function of the cross electrode 11 is to clamp the PVC gel valve core 3 and apply voltage. It does not play a decisive role in blocking the entire pipeline. However, increasing the contact area allows the overall electric field to act more effectively on the PVC gel valve core 3, thereby increasing the degree of creep deformation. Therefore, a cylinder 18 is provided in the middle of the cross electrode 11. The cross-sectional area of ​​the cylinder 18 accounts for approximately one-half of the cross-sectional area of ​​the pipeline, and has little effect on the normal flow of the pipeline. In addition, due to the small size of the electrode, concave right angles are difficult to process. The design here of the cylinder 18 is consistent with the processing technology.

[0039] In this embodiment, the annular electrode 14 is formed by rotating a triangle around an axis. A third through hole 15 for fluid to pass through is provided in the middle portion of the annular electrode 14. The inner side of the annular electrode 14 is provided with an inclined side surface 16. A plurality of grooves 17 are arranged at intervals on the inclined side surface 16. The inclined side surface 16 is in direct contact with the PVC gel valve core 3. When voltage is applied, the gel adheres to the inclined side surface 16 to completely block the third through hole 15, thereby closing the pipeline.

[0040] Preferably, in order to increase the adhesion effect of the gel under limited conditions, the inclined side surface 16 is made into a rough surface similar to a heat sink. After power is turned on, the bottom surface of the PVC gel valve core 3 will sink into the groove 17 of the inclined side surface 16, greatly increasing the contact area, thereby increasing the adhesion force and expanding the pipeline safety pressure adjustment range.

[0041] During specific operation, after voltage is applied, the skirt 19 of the PVC gel valve core 3 gradually fits the oblique side surface 16 of the annular electrode 14, and continues to creep and deform until the skirt 19 is fully stretched and adheres to the oblique side surface 16. At this time, the pipeline is closed, and then the fluid causes pressure on the bowl-shaped structure 21 at the bottom of the PVC gel valve core 3. Due to the high elastic modulus of the gel material, the bowl-shaped structure 21 expands under the action of pressure, carrying the fluid without allowing it to flow. When the pipeline pressure exceeds the limit adhesion force of the PVC gel valve core 3, a part of the skirt 19 is lifted up, and a gap is generated between it and the oblique side surface 16, and the pressure is released. Then the bowl-shaped structure 21 tends to return to its original state, and the part of the skirt that is still adhered will creep and spread to the lifted skirt, so that all the skirts are restored to the adhered state, and the pipeline returns to the open circuit state.

[0042] In this embodiment, the cross electrode 11, the ring electrode 14 and the conductive wire 6 connected to the external voltage are all made of platinum, copper or silver, wherein the cross electrode 11 and the ring electrode 14 are made of the same material, and the conductive wire 6 is connected to the cross electrode 11 and the ring electrode 14 respectively by soldering.

[0043] Specifically, the materials used for the cross electrode 11, the ring electrode 14, and the conductive wire 6 are all high-conductivity, chemically stable, and high-melting-point materials, thereby improving the control accuracy of the microfluidic pressure relief valve. The materials of the two electrodes must be consistent. The conductive wire 6 is preferably made of silver to prevent it from melting under high voltage. The conductive wire 6 is connected to the electrode by soldering. Due to its small overall size, the solder joint 22 should be as thin as possible and should be located on the side of the electrode that contacts the electrode holder to prevent changes in electrode size and interference with other assembly parts.

[0044] In this embodiment, the interiors of the first through hole 8 and the second through hole 13 are filled with photosensitive resin through which conductive wire 6 passes and are encapsulated by ultraviolet light curing. The surface of the inner cavity of the annular electrode seat 5 in contact with the annular electrode 14 is coated with a thin layer of photosensitive resin. After the two are assembled, they are encapsulated by ultraviolet light curing. After the annular electrode seat 5 is installed on the step 9 of the cross electrode seat 4, the photosensitive resin is coated on the outside of the connection and encapsulated by ultraviolet light curing.

[0045] The sealing process of the microfluid pressure relief valve is achieved through the above-mentioned setting. The annular electrode 14 and the annular electrode seat 5 are not tightly assembled. When the PVC gel valve core 3 blocks the pipeline, the fluid will flow out from the gap and cause leakage. Therefore, a thin layer of photosensitive resin Elastic is coated on the surface of the inner cavity of the annular electrode seat 5 in contact with the annular electrode 14. After the annular electrode is assembled, it is UV-cured and packaged to ensure its sealing. In addition, after the two electrode seats are assembled, a gap will be left at the step 9. In order to ensure the successful connection of the two electrode seats and ensure their sealing, photosensitive resin Elastic is coated on the outside of the connection and then UV-cured and packaged. From then on, the microfluid pressure relief valve is assembled and modularized, and can be directly connected to the microfluidic system, which is easy to replace and easy to operate.

[0046] In this embodiment, the upper tip edge of the annular electrode 14 is chamfered, and the lower inner edge is chamfered. The specific positions of the chamfered portion 23 and the chamfered portion 24 are as follows: Figure 9 The upper tip edge of the annular electrode 14 is chamfered to avoid tip discharge due to charge concentration under high voltage, which may damage the PVC gel valve core 3 in the middle of the electrode. Similarly, the inner lower edge is chamfered based on processing technology.

[0047] In this embodiment, when energized, the PVC gel valve core 3, annular electrode 14, and cross electrode 11 come into direct contact with the pipeline fluid, which can be vegetable oil, kerosene, or air. To prevent short circuits and discharge breakdown, the fluid should have very low conductivity. Therefore, a fluid with excellent insulating properties, such as vegetable oil, kerosene, or air, is used.

[0048] This embodiment provides a controllable, one-way microfluidic pressure relief valve based on electrically braked PVC gel. By adjusting the voltage, the valve defines a safety threshold for pipeline pressure, thereby stabilizing the pressure level. The valve comprises three main components: an electrode holder, electrodes, and a valve core. External interfaces are provided on the outer sides of the two electrode holders, with holes left at the edges for connecting to the circuit. The two electrode holders serve as supports to secure the positive and negative electrodes and the PVC gel valve core 3 in the middle.

[0049] PVC gel exhibits excellent electrical response properties. When exposed to an electric field, the surface in contact with the metal electrode undergoes amoeba-like pseudopod creep deformation, generating electrostatic adhesion, causing it to adhere to the electrode surface. When current is applied, this surface expands outward, further increasing the adhesion due to the increased contact area. Based on this, the electrode shape and the size and position of the gel between the electrodes are rationally designed, enabling the pressure relief valve to successfully block fluid flow when energized.

[0050] Furthermore, by adjusting the electric field voltage, the contact area between the gel and the electrode can be controlled to adjust the adhesion force, which in turn affects the fluid pressure blocked by the valve. Therefore, this microfluidic pressure relief valve can precisely set the safe and stable pressure of the pipeline fluid. Furthermore, because the pressure relief valve has the function of blocking the fluid, the gel can be controlled to adhere to or detach from the electrode surface by switching the power on and off. Under appropriate conditions, it can also function as a control valve to achieve pipeline on / off functions.

[0051] In this embodiment, the PVC gel valve core 3 is the core component of the microfluidic pressure relief valve. Its overall shape is top-hat-shaped, with a portion of the outer skirt 19 directly contacting the oblique side 16 of the annular electrode 14. The height of the upper cylindrical support 20 determines the gap between the annular electrode 14 and the cross electrode 11. The bottom recess is bowl-shaped. When voltage is applied, the skirt 19 gradually conforms to the oblique side 16 of the annular electrode 14, continuously creeping and deforming until the skirt 19 fully extends and adheres to the oblique side 16. At this point, the pipeline is closed, and the fluid exerts pressure on the bottom. Due to the high elastic modulus of the gel, the bottom recess expands under pressure, holding the fluid but preventing it from flowing. When the pipeline pressure exceeds the limit of adhesion of the PVC gel valve core 3, a portion of the skirt lifts, creating a gap between the oblique side 16 and the pressure relief function. At this point, the bottom recess tends to return to its original shape, and the remaining adhered portion of the skirt creeps toward the lifted skirt, restoring the adhered state and returning the pipeline to its open state. When the pipeline pressure is always greater than the gel adhesion force, the PVC gel valve core 3 will repeat the above state, but the magnitude of the excess pressure will change the amount of the raised skirt. The greater the excess, the faster the pressure relief, ensuring that the pipeline fluid pressure can quickly return to the safety threshold; on the contrary, when the pipeline pressure is lower than the limit adhesion force, the PVC gel valve core 3 will always block the pipeline, and the bottom depression will expand and swell as the pipeline pressure changes. When the relationship between the limit pressure value and the voltage is understood, the micro fluid pressure relief valve can be provided with precise control of the safety pressure and fast and stable working pressure.

[0052] When a voltage is applied between the PVC gel valve core 3 and the metal electrode surface, a plasticizer-rich layer of plasticizer molecules tens of microns thick forms within the gel, close to the gel surface interface. A primary voltage drop occurs in this layer, generating a large electric field and strong electrostatic forces, driving the gel's amoeba-like creep deformation and adhesion. Compared to the bulk gel, this plasticizer-rich layer has a significantly higher elastic modulus, allowing it to exhibit strong ductility under electrostatic forces and conform to rough surfaces.

[0053] Because the PVC gel valve core 3 exhibits rapid response when power is turned on and off, this microfluid pressure relief valve can also, to a certain extent, serve as a fluid control valve in a microfluidic control system. When the circuit is disconnected, only the skirt of the PVC gel valve core 3 contacts the oblique side surface 16. Fluid passing through the pipeline directly breaks the contact interface, allowing the pipeline to flow. When the circuit is connected, the gel skirt creeps and adheres to the oblique side surface 16, blocking the third through hole 15. The adhesive force offsets the pipeline pressure, completing the pipeline closure.

[0054] Due to the unique structure of this microfluidic pressure relief valve, when no external voltage is applied, the fluid in the pipeline can only flow from the second port 12 of the annular electrode holder 5 to the first port 7 of the cross electrode holder 4. When the fluid flows in the opposite direction, the gel is pressed against the inclined side 16 of the annular electrode 14 by pressure, causing its skirt 19 to fit tightly against the inclined side 16, completely closing the pipeline. Therefore, this microfluidic pressure relief valve acts like a controllable semiconductor, achieving controllable unidirectional flow.

[0055] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A micro fluid pressure relief valve based on electric brake PVC gel, characterized in that: The invention comprises an electrode seat (1), an electrode (2) and a PVC gel valve core (3), wherein the electrode seat (1) comprises a cross electrode seat (4) and a ring electrode seat (5), and the electrode (2) comprises a cross electrode (11) and a ring electrode (14), wherein the cross electrode (11) is installed inside the cross electrode seat (4), and the ring electrode (14) is installed inside the ring electrode seat (5), and a step (9) for assembling, positioning and fixing the ring electrode seat (5) is provided inside the cross electrode seat (4). After the ring electrode seat (5) is installed on the step (9), the cross electrode (11) and the ring electrode (14) are placed relative to each other and the middle part of the two clamps the PVC gel valve core (3), and the PVC gel valve core (3) comprises a cylindrical support body (20), the bottom of the cylindrical support body (20) is concave inward to form a bowl-shaped structure (21), and the bottom edge of the cylindrical support body (20) extends outward to form a skirt (19); The PVC gel valve core (3) is made of gel material with a ratio of PVC:DBA=1:9, and is formed by mold casting and solvent volatilization. The gel material of the PVC gel valve core (3) contains a high content of plasticizer DBA. The interaction between PVC and plasticizer DBA generates a huge dielectric constant. Under the action of high voltage, the gel surface will produce a high degree of polarization, attracting the metal electrode, and finally generating electrostatic adhesion. By adjusting the voltage, the PVC gel valve core (3) will change the magnitude of the electrostatic adhesion force on the annular electrode (14), thereby regulating the pipeline safety pressure.

2. A micro fluid pressure relief valve based on electric brake PVC gel as claimed in claim 1, characterized in that: The cross electrode seat (4) and the annular electrode seat (5) are both provided with interfaces at ends away from each other, the interface on the cross electrode seat (4) is a first interface (7), and the interface on the annular electrode seat (5) is a second interface (12), the first interface (7) and the second interface (12) are both used to connect external pipelines, a first through hole (8) is provided on one side of the cross electrode seat (4) located at the first interface (7), and a second through hole (13) is provided on one side of the annular electrode seat (5) located at the second interface (12), and conductive wires (6) are both buried in the first through hole (8) and the second through hole (13).

3. The micro fluid pressure relief valve based on electric brake PVC gel according to claim 1, characterized in that: Four positioning slots (10) are provided on the step (9), and the positioning slots (10) are used for assembling, positioning and constraining the cross electrode (11).

4. A micro fluid pressure relief valve based on electric brake PVC gel as claimed in claim 3, characterized in that: A cylinder (18) is provided in the middle of the cross electrode (11), and the cylinder (18) is in contact with the cylindrical support (20).

5. The micro fluid pressure relief valve based on electric brake PVC gel according to claim 1, characterized in that: The annular electrode (14) is formed by rotating a triangle around an axis. A third through hole (15) for fluid to pass through is provided in the middle of the annular electrode (14). The inner side of the annular electrode (14) is provided with an inclined side surface (16). A plurality of grooves (17) are arranged at intervals on the inclined side surface (16). The inclined side surface (16) is in direct contact with the PVC gel valve core (3). When voltage is applied, the gel adheres to the inclined side surface (16) to completely block the third through hole (15) to achieve pipeline closure.

6. The micro fluid pressure relief valve based on electric brake PVC gel according to claim 5, characterized in that: After voltage is applied, the skirt (19) of the PVC gel valve core (3) gradually fits the oblique side surface (16) of the annular electrode (14) and continuously creeps and deforms until the skirt (19) is fully stretched and adheres to the oblique side surface (16). At this time, the pipeline is closed, and then the fluid exerts pressure on the bowl-shaped structure (21) at the bottom of the PVC gel valve core (3). Due to the high elastic modulus of the gel material, the bowl-shaped structure (21) expands under the action of pressure, carrying the fluid without allowing it to circulate. When the pipeline pressure exceeds the limit adhesion force of the PVC gel valve core (3), a part of the skirt (19) rises, and a gap is generated between it and the oblique side surface (16) and the pressure is released. Then the bowl-shaped structure (21) tends to return to its original state, and the part of the skirt that is still adhered will creep and spread toward the raised skirt, so that all the skirts return to the adhered state, and the pipeline returns to the disconnected state.

7. The micro fluid pressure relief valve based on electric brake PVC gel according to claim 2, characterized in that: The cross electrode (11), the ring electrode (14) and the conductive wire (6) connected to the external voltage are all made of platinum, copper or silver, wherein the cross electrode (11) and the ring electrode (14) are made of the same material, and the conductive wire (6) is connected to the cross electrode (11) and the ring electrode (14) respectively by soldering.

8. The micro fluid pressure relief valve based on electric brake PVC gel according to claim 2, characterized in that: The interiors of the first through hole (8) and the second through hole (13) are filled with photosensitive resin through conductive wires (6) and are then cured with ultraviolet light for packaging. A thin layer of photosensitive resin is applied to the inner cavity of the annular electrode seat (5) and the surface in contact with the annular electrode (14). After the two are assembled, they are cured with ultraviolet light for packaging. After the annular electrode seat (5) is mounted on the step (9) of the cross electrode seat (4), a photosensitive resin is applied to the outer side of the connection and is cured with ultraviolet light for packaging.

9. The micro fluid pressure relief valve based on electric brake PVC gel according to claim 1, characterized in that: The upper tip edge of the annular electrode (14) is chamfered, and the lower inner edge is chamfered.

10. The micro fluid pressure relief valve based on electric brake PVC gel according to claim 1, characterized in that: After power is turned on, the PVC gel valve core (3), the annular electrode (14) and the cross electrode (11) will directly contact the pipeline fluid, and the fluid is selected from vegetable oil, kerosene or air.

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