Micro fluid pressure release valve based on electric braking PVC gel

Abstract

The invention discloses a micro fluid pressure release valve based on electric braking PVC gel, and relates to the technical field of pressure release valves. Comprising an electrode holder, electrodes and a PVC gel valve element, the electrode holder comprises a cross electrode holder and an annular electrode holder, the electrodes comprise a cross electrode and an annular electrode, the cross electrode is installed in the cross electrode holder, the annular electrode is installed in the annular electrode holder, a step is arranged in the cross electrode holder, and after the annular electrode holder is installed on the step, the annular electrode holder is connected with the PVC gel valve element. The cross electrode and the annular electrode are arranged oppositely, a PVC gel valve element is clamped between the cross electrode and the annular electrode, the PVC gel valve element comprises a cylindrical supporting body, the bottom of the cylindrical supporting body is sunken inwards to form a bowl-shaped structure, and the edge of the bottom of the cylindrical supporting body extends outwards to form a skirt edge. According to the invention, the hard problems of large volume and heavy weight in the prior art are solved, miniaturization and system integration are realized, and possibility is provided for realizing a more complex and finer microfluidic 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 is widely used in the development of microscale chips, drug screening, catalytic reaction research and other fields due to its unique advantages in controlling fluid behavior, processing micro-nanoscale fluids and efficient analysis. Fluid pressure relief valves, as important components of control systems, play an indispensable role. In order to achieve pipeline fluid pressure control at the microscale and provide a stable pipeline working pressure, the control reliability of relying solely on fluid pumps and pressure regulating valves is insufficient. It is necessary to set a pressure relief valve in the pipeline to provide a threshold to ensure stable pressure.

[0003] However, most traditional fluid pressure relief valves are spring-type and lever-type. Since they require hardware such as springs and heavy hammers, they are generally large in size and heavy in weight, and can no longer adapt to the increasingly miniaturized and modular microfluidic control systems. Secondly, when adjusting the working pressure in the pipeline, the existing fluid pressure relief valves need to manually change the spring compression, and frequent adjustments will damage the sealing surface, which can no longer adapt to precise flow control and complex microfluidic control systems. Finally, due to their low sensitivity, traditional pressure relief valves are difficult to achieve 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 electric brake PVC gel, comprising an electrode seat, an electrode and a PVC gel valve core, wherein the electrode seat comprises a cross electrode seat and an annular electrode seat, wherein the electrode comprises a cross electrode and an annular electrode, wherein the cross electrode is installed inside the cross electrode seat, wherein the annular electrode is installed inside the annular electrode seat, wherein a step for assembling, positioning and fixing the annular electrode seat is provided inside the cross electrode seat, wherein after the annular electrode seat is installed on the step, the cross electrode and the annular electrode are placed opposite to each other and the middle part of the two clamps the PVC gel valve core, wherein the PVC gel valve core comprises a cylindrical support body, wherein the bottom of the cylindrical support body is concave inwardly to form a bowl-shaped structure, and the bottom edge of the cylindrical support body extends outwardly to form a skirt;

[0007] The PVC gel valve core adopts 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. A huge dielectric constant is generated through the interaction between PVC and plasticizer DBA. 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. Through voltage regulation, the PVC gel valve core will change the electrostatic adhesion force adhering to the annular electrode, thereby regulating the safety pressure of the pipeline.

[0008] Furthermore, the cross electrode seat and the annular electrode seat are 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 annular 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 cross electrode seat located at the first interface, and a second through hole is provided on one side of the annular electrode seat located at the second interface, and conductive wires are buried in the first through hole and the second through hole.

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

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

[0011] Furthermore, the annular electrode is formed by rotating a triangle around an axis, 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, 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, and when voltage is connected, gel is adhered to the inclined side surface to completely block the third through hole to achieve pipeline closure.

[0012] Furthermore, after voltage is applied, 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 exerts 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 and swells 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 portion of the skirt rises, creating a gap between the skirt and the oblique side surface and completing the pressure relief. Then the bowl-shaped structure tends to return to its original state, and the portion 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 at this time 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 respectively connected to the cross electrode and the ring electrode by soldering.

[0014] Furthermore, the interiors of the first through hole and the second through hole are passed through conductive wires, filled with photosensitive resin and packaged using ultraviolet light curing, and the surface of the inner cavity of the annular electrode seat that contacts the annular electrode is coated with a thin layer of photosensitive resin. After the two are assembled, they are packaged using ultraviolet light curing, and after the annular electrode seat is installed on the step of the cross electrode seat, photosensitive resin is coated on the outside of the connection and packaged using ultraviolet light 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 annular electrode and the cross electrode will directly contact with 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, which 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, and miniaturization and system integration are achieved, providing the possibility of realizing more complex and sophisticated microfluidic operating systems and wider applications. The microfluid 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 holder of the present invention.

[0024] Figure 6 It is a side view of the annular electrode holder 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] Fig. 9 It is a half-section view of the annular electrode of the present invention.

[0028] Fig.10 It is a top view of the annular electrode of the present invention.

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

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

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

[0032] Description of the 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 slide 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. Rounded corners; 24. Chamfered corners. DETAILED DESCRIPTION

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

[0034] Combination Figures 1 to 11 The present embodiment provides a micro fluid pressure relief valve based on electric brake PVC gel, comprising 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, and after the ring electrode seat 5 is installed 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, and the PVC gel valve core 3 comprises a cylindrical support body 20, the bottom of the cylindrical support body 20 is inwardly concave to form a bowl-shaped structure 21, and 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 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 3 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 finally produce electrostatic adhesion. Through voltage regulation, the PVC gel valve core 3 will change the size of the electrostatic adhesion force adhering to the annular electrode 14, thereby regulating the safety pressure of the pipeline.

[0036] In this embodiment, the cross electrode seat 4 and the annular electrode seat 5 are provided with interfaces at one end 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 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. 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. When in use, the cross electrode 11 can slide on the positioning slots 10 so as 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 body 20. In specific operation, the main function of the cross electrode 11 is to clamp the PVC gel valve core 3 and apply voltage, which does not play a decisive role in the overall pipeline blocking, but increases a certain contact area so that the overall electric field acts 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, and the cross-sectional area of ​​the cylinder 18 accounts for approximately one-half of the cross-sectional area of ​​the pipeline, which has little effect on the normal circulation of the pipeline. In addition, due to the small size of the electrode, the concave right angle is difficult to process, and the design here as a cylinder 18 is in line with the processing technology.

[0039] In this embodiment, the annular electrode 14 is formed by rotating a triangle around an axis, and 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, and 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 the voltage is connected, the gel is adhered to the inclined side surface 16 to completely block the third through hole 15 to achieve the closure of 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, which greatly increases the contact area, thereby increasing the adhesion 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 inclined side surface 16 of the annular electrode 14, and continuously creeps and deforms until the skirt 19 is fully stretched and adheres to the inclined 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 and swells 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 the skirt and the inclined side surface 16 to complete the pressure relief. 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 adhesion 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 respectively connected to the cross electrode 11 and the ring electrode 14 by soldering.

[0043] Specifically, the materials used for the cross electrode 11, the annular electrode 14, and the conductive wire 6 are all high-melting-point materials with high conductivity and stable chemical properties, thereby improving the control accuracy of the microfluid pressure relief valve. Among them, the materials of the two electrodes must be consistent. The conductive wire 6 is preferably made of silver material to prevent it from melting under high voltage. The conductive wire 6 is connected to the electrode by soldering. Due to the small overall size, the welding point 22 should be as thin as possible and should be located on the side where the electrode contacts the electrode seat to prevent the electrode size from changing and interfering 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 the conductive wire 6 passes and are packaged by UV 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 packaged by UV light curing. After the annular electrode seat 5 is installed on the step 9 of the cross electrode seat 4, photosensitive resin is coated on the outside of the connection and packaged by UV light curing.

[0045] The sealing treatment of the microfluid pressure relief valve is achieved through the above-mentioned settings. The assembly of the annular electrode 14 and the annular electrode seat 5 is not tight. 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 applied to the surface of the inner cavity of the annular electrode seat 5 in contact with the annular electrode 14, and the annular electrode is assembled and then 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 applied to the outside of the connection and then UV-cured and packaged. Since then, the microfluid pressure relief valve has been assembled and modularized, and can be directly connected to the microfluidic system, which is easy to replace and convenient 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: Fig. 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, 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. The energized PVC gel valve core 3, the annular electrode 14 and the cross electrode 11 will directly contact the pipeline fluid. In order to avoid short circuit, discharge breakdown and the like, the fluid should have very low conductivity, so a fluid with excellent insulation performance such as vegetable oil, kerosene or air is selected.

[0048] The present embodiment provides a controllable one-way microfluid pressure relief valve based on electric brake PVC gel, which stabilizes the pressure by adjusting the voltage to define the safety threshold for the pipeline pressure. The pressure relief valve includes three parts: an electrode seat, an electrode, and a valve core. The two electrode seats are provided with external circuit interfaces on the outside, and holes are left on the edges of the interfaces to connect the circuit. The two electrode seats are used as supports to fix the positive and negative electrodes and the PVC gel valve core 3 in the middle.

[0049] PVC gel has excellent electrical response performance. The surface in contact with the metal electrode will produce pseudopod creep deformation like amoeba under the electric field, and generate electrostatic adhesion force, adhering to the electrode surface. When the power is turned on, the surface will continue to expand outward, and the adhesion force will increase further due to the increase in contact area. On this basis, the electrode shape and the size and position of the gel between the electrodes are reasonably designed, so that the pressure relief valve can successfully block the flow of fluid when the power is turned on.

[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, and the adhesion force will affect the fluid pressure blocked by the valve. Therefore, the micro fluid pressure relief valve has the function of accurately setting the safety pressure and stable pressure of the pipeline fluid. In addition, since 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 turning on and off the power, and under appropriate conditions, it can be used as a control valve to realize the pipeline on-off function.

[0051] In this embodiment, the PVC gel valve core 3 is the core part of the micro fluid pressure relief valve, and the overall shape is a top hat shape. A part of the outer skirt 19 is in direct contact with the oblique side 16 of the annular electrode 14, and the height of the upper cylindrical support body 20 determines the size of the gap between the annular electrode 14 and the cross electrode 11. The bottom depression is bowl-shaped. After the voltage is applied, the skirt 19 gradually fits the oblique side 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 16. At this time, the pipeline is closed and the fluid exerts pressure on the bottom. Due to the high elastic modulus of the gel, the bottom depression expands and expands under the action of pressure, carrying the fluid without allowing it to flow. When the pipeline pressure exceeds the limit adhesion of the PVC gel valve core 3, a part of the skirt is lifted up, and a part of the gap is generated between the oblique side 16 and the pressure relief is completed. At this time, the bottom depression tends to return to its original state, and the part of the skirt that is still adhered will creep and spread to the raised skirt, and the skirt will return to the adhesion state, and the pipeline will return to the disconnected 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 excess pressure will change the amount of the raised skirt. The more 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 air pressure value and the voltage is understood, the micro fluid pressure relief valve can be provided with accurate control of the safety pressure and fast and stable working pressure.

[0052] When voltage is applied between the PVC gel valve core 3 and the metal electrode surface, a plasticizer-rich layer of plasticizer molecules with a thickness of tens of microns is formed in the gel, close to the gel surface interface. The primary voltage drop occurs in this layer, generating a large electric field and a large electrostatic force, providing a driving force for the amoeba-like creep deformation and adhesion of the gel. Compared with the bulk gel, the plasticizer-rich layer has an ultra-high elastic modulus, which enables the surface to have strong ductility under electrostatic force and conform to rough surfaces.

[0053] Based on the rapid response of the PVC gel valve core 3 when the power is turned on and off, the micro fluid pressure relief valve can also be used as a fluid control valve in a micro fluid control system to a certain extent. When the circuit is not connected, only the skirt of the PVC gel valve core 3 contacts the oblique side surface 16, and the contact interface will be directly opened when the pipeline fluid passes through, and the pipeline will flow; after the circuit is connected, the gel skirt creeps and adheres to the oblique side surface 16, blocking the third through hole 15, and the adhesion force offsets the pipeline pressure, completing the pipeline closure.

[0054] Due to the unique structure of the microfluid pressure relief valve, when no external voltage is connected, the pipeline fluid can only flow from the second interface 12 of the annular electrode holder 5 to the first interface 7 of the cross electrode holder 4; when the fluid flows in the reverse direction, the gel will be pressed against the oblique side 16 of the annular electrode 14 by pressure, so that its skirt 19 fits tightly against the oblique side 16, and the pipeline is completely closed at this time. Therefore, the microfluid pressure relief valve is similar to a controllable semiconductor, realizing controllable one-way flow.

[0055] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight 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 an annular electrode seat (5), wherein the electrode (2) comprises a cross electrode (11) and an annular electrode (14), wherein the cross electrode (11) is installed inside the cross electrode seat (4), and the annular electrode (14) is installed inside the annular electrode seat (5), wherein a step (9) for assembling, positioning and fixing the annular electrode seat (5) is provided inside the cross electrode seat (4), and after the annular electrode seat (5) is installed on the step (9), the cross electrode (11) and the annular electrode (14) are placed opposite to each other and the middle part of the cross electrode (11) and the annular electrode (14) clamps the PVC gel valve core (3), and the PVC gel valve core (3) comprises a cylindrical support body (20), wherein the bottom of the cylindrical support body (20) is recessed inwardly to form a bowl-shaped structure (21), and the bottom edge of the cylindrical support body (20) extends outwardly 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. A huge dielectric constant is generated through the interaction between PVC and the plasticizer DBA. Under the action of high voltage, the gel surface will produce a high degree of polarization, attracting the metal electrode, and finally generating an electrostatic adhesion phenomenon. By adjusting the voltage, the PVC gel valve core (3) will change the magnitude of the electrostatic adhesion force adhering to 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, the cross electrode seat (4) is provided with a first through hole (8) on one side of the first interface (7), and the annular electrode seat (5) is provided with a second through hole (13) on one side of the second interface (12), and conductive wires (6) are both buried in the first through hole (8) and the second through hole (13).

3. A micro fluid pressure relief valve based on electric brake PVC gel as claimed in claim 1, characterized in that: The step (9) is provided with four positioning slots (10), 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. A micro fluid pressure relief valve based on electric brake PVC gel as claimed in 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). An inclined side surface (16) is provided inside the annular electrode (14). 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 connected, gel is adhered to the inclined side surface (16) to completely block the third through hole (15) to achieve pipeline closure.

6. A micro fluid pressure relief valve based on electric brake PVC gel as claimed in 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 and swells 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) rises, and a gap is generated between the skirt and the oblique side surface (16) to complete the pressure relief. 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 raised skirt, so that all the skirts return to the adhered state, and at this time the pipeline returns to the disconnected state.

7. A micro fluid pressure relief valve based on electric brake PVC gel as claimed in 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 respectively connected to the cross electrode (11) and the ring electrode (14) by soldering.

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

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

10. A micro fluid pressure relief valve based on electric brake PVC gel as claimed in 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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