Fluid pressure driving type controllable rubber sealing device and control method thereof

Abstract

The invention discloses a fluid pressure driving type controllable rubber sealing device and a control method thereof. The fluid pressure driving type controllable rubber sealing device comprises a sealing ring, a pressure adjusting device and a monitoring control system. The sealing ring comprises a plastic ring and a rubber outer ring; the pressure adjusting device comprises a rubber inner ring, a fluid conveying pipe and a valve element. The monitoring control system comprises a monitoring device, a microprocessor, a controller and a voltage transformation device. According to the control method, the leakage amount of the sealing element is monitored in real time through the monitoring device, the compensation pressure needed by the annular pressure cavity in the rubber inner ring is obtained through analysis and calculation of the microprocessor, the pressure transformation device is controlled by the controller to open and close the valve element, contraction and expansion of the sealing element are achieved, and the purpose of accurately controlling leakage is achieved. The environment adaptability of the sealing element is enhanced, long-term stable operation of sealing is ensured, and the service life of the sealing element is prolonged.

Description

Technical Field

[0001] The invention relates to the field of rubber and plastic sealing, and in particular to a fluid pressure driven controllable rubber sealing device and a control method thereof. Background Art

[0002] Rubber and plastic seals are a type of contact seals made of polymer materials such as rubber and plastic. They provide the necessary sealing resistance through their own elastic deformation to achieve the sealing function. They have been widely used in high-end equipment in the fields of aerospace, petrochemicals, energy mining and processing and manufacturing. With the deepening development of high-end equipment, rubber and plastic seals often need to operate in extreme environments, such as high cold, wide temperature range, high humidity conditions, and withstand shock and vibration. At the same time, they also need to cope with harsh working conditions such as high speed, high pressure, high temperature or low temperature. The sealing performance and reliability face severe tests. Once the seal fails, it will not only cause medium leakage and equipment power reduction, but in severe cases it may also lead to major safety accidents such as poisoning, fire, and explosion.

[0003] There are many deficiencies in the rubber and plastic seals currently on the market. They cannot be adaptively adjusted according to changes in the working environment, the sealing failure process is often sudden, and the utilization rate of sealing materials is low. The reliability of the seals is seriously insufficient. Once the seal design is completed, its performance is difficult to adjust again, and as the service time increases, its performance will inevitably decline rapidly, making it difficult to ensure long-term service reliability. Therefore, in order to serve the equipment needs in the field of extreme working conditions, it is particularly important to develop a self-compensating sealing system with real-time monitoring and autonomous control capabilities. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a fluid pressure-driven controllable rubber sealing device and a control method thereof, which can monitor the leakage change of the sealing system in real time, judge the sealing operation status, and use fluid control technology to timely adjust the sealing resistance, so as to achieve the optimal adjustment and automatic control of the sealing service performance, thereby improving the service reliability of the seal and extending its service life.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A fluid pressure driven controllable rubber sealing device, comprising a sealing ring, a pressure regulating device and a monitoring control system;

[0007] The sealing ring comprises a plastic ring 1 and a rubber outer ring 2; a sealing lip is provided at the inner diameter of the plastic ring 1, and the cross-sectional shape of the sealing lip is an asymmetric V-shape; an annular cavity is provided inside the rubber outer ring 2, and an annular notch is provided at the outer diameter, and the annular notch is communicated with the annular cavity;

[0008] The pressure regulating device comprises a rubber inner ring 3, a fluid delivery tube 4, and a valve core 5; an annular pressure cavity is provided inside the rubber inner ring 3, and a through hole is provided at the outer diameter, the through hole is connected to the annular pressure cavity and bonded to one end of the fluid delivery tube 4; a groove is provided on the outer surface of the bonding end of the fluid delivery tube 4, and an internal thread 41 is provided in the middle section; the valve core 5 comprises a threaded cap 51, a core rod 52, a first core body 53, a second core body 54, a first gasket 55, a spring 56, a second gasket 57, and a bottom valve core platform 58; a first external thread 521 is provided at one end of the core rod 52, a second external thread 523 is provided at the other end, and a baffle 522 is provided in the middle section; a crossbeam is provided at one end of the first core body 53, and a through hole is provided on the crossbeam; a groove is provided on the outer surface of one end of the second core body 54, a third external thread 541 is provided on the outer surface of the other end, a through hole is provided at the bottom, and an annular groove is provided on the outer surface of the middle section; the first core body 5 3, and the other end is embedded in the groove at one end of the second core body 54; an annular groove and a threaded hole are provided on the surface of the bottom valve core platform 58; one end of the core rod 52 passes through the through hole on the cross beam of the first core body 53, and is screwed with the threaded cap 51 through the first external thread 521; the other end of the core rod 52 passes through the spring 56 and the through hole at the bottom of the second core body 54 in sequence, and is connected and fixed with the threaded hole of the bottom valve core platform 58 through the second external thread 523; the first gasket 55 is installed in the annular groove in the middle section of the second core body 54, and fits with the inner surface of the fluid delivery pipe 4; the second gasket 57 is installed in the annular groove on the surface of the bottom valve core platform 58, and fits with the outer surface of the bottom of the second core body 54; one end of the spring 56 fits with the inner surface of the bottom of the second core body 54, and the other end contacts the baffle 522; the fluid delivery pipe 4 is connected and fixed to the valve core 5 through the internal thread 41 and the third external thread 541;

[0009] The monitoring and control system includes a monitoring device 6, a microprocessor 7, a controller 8, and a pressure transformer 9; the monitoring device 6 is used to monitor the leakage of the seal; the microprocessor 7 is used to analyze the change in the leakage and calculate the fluid pressure value required to be output by the pressure transformer 9; the controller 8 is used to control the working state of the pressure transformer 9; the pressure transformer 9 is used to output fluid pressure and drive the valve core 5 to move to change the fluid pressure value of the annular pressure cavity inside the rubber inner ring 3.

[0010] Furthermore: the material of the plastic ring 1 includes polytetrafluoroethylene, polyurethane, polyetheretherketone, nitrile rubber, EPDM rubber, silicone rubber, and fluororubber; the number of sealing lips at the inner diameter of the plastic ring 1 is 1 to 10; the materials of the rubber outer ring 2 and the rubber inner ring 3 include nitrile rubber, EPDM rubber, silicone rubber, and fluororubber.

[0011] Furthermore: the bonding method of the rubber inner ring 3 and the fluid delivery pipe 4 includes hot pressing, gluing, and rubber encapsulation.

[0012] Furthermore, the connection method between the other end of the bonding end of the fluid delivery pipe 4 and the voltage transformer 9 includes threaded connection, welding, bonding, and buckle ring connection.

[0013] Furthermore: the fluid output by the voltage transformer 9 includes liquid, gas, and gel.

[0014] A control method for a fluid pressure driven controllable rubber sealing device comprises the following steps:

[0015] (1) The monitoring device uses sensors to measure the seal leakage Q and the fluid pressure p in the annular pressure cavity inside the rubber inner ring. 0 and sends it to the microprocessor; the microprocessor compares the measured leakage volume Q with its internal preset leakage volume threshold Q 0 Compare and calculate the compensation pressure Δp and transformer output pressure p; if Q≤Q 0 , the microprocessor determines that the seal leakage does not exceed the standard, and p = p 0 , send a command to the controller not to drive the transformer device, and the working state of the transformer device will not change; if Q>Q 0 , the microprocessor determines that the seal leakage has exceeded the limit, and the microprocessor uses the internal preset program to calculate the compensation pressure Δp. At this time, p = p 0 +Δp, sends a working instruction to the controller to drive the transformer device, and the working state of the transformer device will change; the controller controls the working state of the transformer device according to the received instruction;

[0016] (2) When the transformer receives an instruction to change its working state, it first performs the valve core opening action to put the second core body and the second gasket in a non-contact state, so as to open the sealing channel between the bottom valve core platform and the second core body; then, fluid is filled into the rubber inner ring through the fluid delivery pipe until the fluid pressure in the annular pressure cavity inside the rubber inner ring is equal to p; then, the valve core opening action is removed, and the second core body will resume the close contact state with the second gasket under the action of the spring tension, so as to prevent the fluid inside the rubber inner ring from leaking out.

[0017] Working principle of the present invention:

[0018] The monitoring device uses sensors to measure the seal leakage Q and the fluid pressure p in the annular pressure cavity inside the rubber inner ring. 0 and sends it to the microprocessor; the microprocessor compares the measured leakage volume Q with its internal preset leakage volume threshold Q 0 Compare and calculate the compensation pressure Δp and transformer output pressure p; if Q≤Q 0 , the microprocessor determines that the seal leakage does not exceed the standard, and p = p 0, send a no action command to the controller; if Q>Q 0 , the microprocessor determines that the seal leakage has exceeded the limit, and the microprocessor uses the internal preset program to calculate the compensation pressure Δp. At this time, p = p 0 +Δp, sends an action instruction to the controller; the controller drives the transformer to work according to the received action instruction; after receiving the working instruction, the transformer pushes open the valve core to overcome the spring force, compresses the spring, moves the core rod downward, separates the second core body from the second gasket, and the fluid flows into the rubber inner ring and the rubber outer ring through the valve core and the fluid delivery pipe to expand it, thereby adjusting the sealing leakage Q; when p=p 0 When the valve core is opened, the transformer stops pushing the valve core, the spring returns to normal and pushes up the core rod, the second core body contacts the second gasket, and the fluid pressure is regulated to ensure a stable and effective seal.

[0019] The present invention has the following beneficial effects:

[0020] The monitoring device monitors the seal leakage in real time, and the controller instantly regulates the transformer, accurately adjusts the fluid pressure of the annular pressure cavity inside the rubber inner ring, effectively controls the deformation of the seal, realizes dynamic management of the leakage, ensures the long-term stable operation of the seal, and enhances its environmental adaptability. The present invention has a compact structure, simple operation, and long service life. It can automatically balance the leakage, ensure reliable sealing under extreme working conditions, significantly improve the sealing performance, and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a two-dimensional schematic diagram of the cross-sectional structure of Example 1 of the present invention.

[0022] Figure 2 It is a two-dimensional schematic diagram of the cross-sectional structure of the rubber ring in the pressurized state of Example 1 of the present invention.

[0023] Figure 3 It is a two-dimensional schematic diagram of the cross-sectional structure of the valve core in the present invention.

[0024] Figure 4 It is a two-dimensional schematic diagram of the cross-sectional structure of the valve core in the closed state in the present invention.

[0025] Figure 5 It is a two-dimensional schematic diagram of the cross-sectional structure of the valve core in the open state in the present invention.

[0026] Figure 6 It is a three-dimensional schematic diagram of the 3 / 4 cross-sectional structure of the pressure regulating device in the present invention.

[0027] Figure 7 It is a three-dimensional schematic diagram of the 3 / 4 cross-sectional structure of the controllable rubber sealing device in the present invention.

[0028] Figure 8It is a three-dimensional schematic diagram of the cross-sectional structure of the fluid delivery pipe in the present invention.

[0029] Fig. 9 It is a schematic diagram of the three-dimensional structure of the core rod of the present invention.

[0030] Fig.10 It is a schematic diagram of the three-dimensional structure of the core body in the present invention.

[0031] Fig.11 It is a two-dimensional schematic diagram of the cross-sectional structure of Example 2 of the present invention.

[0032] Fig.12 It is a two-dimensional schematic diagram of the cross-sectional structure of the rubber ring in the pressurized state of Example 2 of the present invention.

[0033] In the figure, 1-plastic ring; 2-rubber outer ring; 3-rubber inner ring; 4-fluid delivery pipe; 5-valve core; 6-monitoring device; 7-microprocessor; 8-controller; 9-voltage transformer; 41-internal thread; 51-threaded cap; 52-core rod; 53-first core body; 54-second core body; 55-first gasket; 56-spring; 57-second gasket; 58-bottom valve core platform; 521-first external thread; 522-baffle; 523-second external thread; 541-third external thread. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments, wherein the illustrative embodiments and descriptions are only used to illustrate the present invention and are not intended to be improper constraints or limitations on the present invention.

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments mentioned in this application can be combined with each other.

[0036] It should be noted that the terms used in this application are only used to describe specific embodiments and are not limited to the illustrative embodiments according to this application. As used herein, unless the context clearly indicates otherwise, the singular form also includes the plural form. In addition, when the terms "comprise" and / or "include" are used in this specification, it should be understood to indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0037] Example 1

[0038] Reference Figures 1 to 10As shown, a fluid pressure-driven controllable rubber sealing device includes a sealing ring, a pressure regulating device and a monitoring and control system. The sealing ring includes a plastic ring 1 and a rubber outer ring 2; a sealing lip is provided at the inner diameter of the plastic ring 1, and the cross-sectional shape of the sealing lip is an asymmetric V-shape; an annular cavity is provided inside the rubber outer ring 2, and an annular notch is provided at the outer diameter, and the annular notch is connected to the annular cavity; the pressure regulating device includes a rubber inner ring 3, a fluid delivery pipe 4, and a valve core 5; an annular pressure cavity is provided inside the rubber inner ring 3, and a through hole is provided at the outer diameter, and the through hole is connected to the annular pressure cavity and bonded to one end of the fluid delivery pipe 4; a groove is provided on the outer surface of the bonding end of the fluid delivery pipe 4, and an internal thread 41 is provided in the middle section; the valve core The valve core 5 comprises a threaded cap 51, a core rod 52, a first core body 53, a second core body 54, a first gasket 55, a spring 56, a second gasket 57, and a bottom valve core platform 58; the core rod 52 has a first external thread 521 at one end, a second external thread 523 at the other end, and a baffle 522 in the middle; the first core body 53 has a crossbeam at one end, and a through hole is formed on the crossbeam; the second core body 54 has a groove on the outer surface at one end, a third external thread 541 on the outer surface at the other end, a through hole at the bottom, and an annular groove on the outer surface in the middle; the other end of the first core body 53 is embedded in the groove at one end of the second core body 54; the bottom An annular groove and a threaded hole are provided on the surface of the valve core platform 58; one end of the core rod 52 passes through the through hole on the cross beam of the first core body 53, and is screwed to the threaded cap 51 through the first external thread 521; the other end of the core rod 52 passes through the spring 56 and the through hole at the bottom of the second core body 54 in sequence, and is connected and fixed to the threaded hole of the bottom valve core platform 58 through the second external thread 523; the first gasket 55 is installed in the annular groove in the middle section of the second core body 54, and fits with the inner surface of the fluid delivery pipe 4; the second gasket 57 is installed in the annular groove on the surface of the bottom valve core platform 58, and fits with the outer surface of the bottom of the second core body 54; the spring One end of the spring 56 is in contact with the inner surface of the bottom of the second core 54, and the other end is in contact with the baffle 522; the fluid delivery pipe 4 is connected and fixed to the valve core 5 through the internal thread 41 and the third external thread 541; the material of the plastic ring 1 includes polytetrafluoroethylene, polyurethane, polyetheretherketone, nitrile rubber, EPDM rubber, silicone rubber, and fluororubber; the number of sealing lips at the inner diameter of the plastic ring 1 is 1 to 10; the material of the rubber outer ring 2 and the rubber inner ring 3 includes nitrile rubber, EPDM rubber, silicone rubber, and fluororubber; the bonding method of the rubber inner ring 3 and the fluid delivery pipe 4 includes hot pressing, gluing, and rubber encapsulation;

[0039] The monitoring and control system includes a monitoring device 6, a microprocessor 7, a controller 8, and a transformer 9; the monitoring device 6 is used to monitor the leakage of the seal; the microprocessor 7 is used to analyze the change in the leakage and calculate the fluid pressure value required to be output by the transformer 9; the controller 8 is used to control the working state of the transformer 9; the transformer 9 is used to output fluid pressure and drive the valve core 5 to move so as to change the fluid pressure value of the annular pressure cavity inside the rubber inner ring 3; the connection method between the other end of the bonding end of the fluid delivery pipe 4 and the transformer 9 includes threaded connection, welding, bonding, and buckle ring connection; the fluid output by the transformer 9 includes liquid, gas, and gel.

[0040] The specific control principle of the present invention is: the monitoring device uses a sensor to measure the leakage Q of the seal, the fluid pressure p of the annular pressure cavity inside the rubber inner ring, and the 0 and sends it to the microprocessor; the microprocessor compares the measured leakage volume Q with its internal preset leakage volume threshold Q 0 Compare and calculate the compensation pressure Δp and transformer output pressure p; if Q≤Q 0 , the microprocessor determines that the seal leakage does not exceed the standard, and p = p 0 , send a command to the controller not to drive the transformer device, and the working state of the transformer device will not change; if Q>Q 0 , the microprocessor determines that the seal leakage has exceeded the limit, and the microprocessor uses the internal preset program to calculate the compensation pressure Δp. At this time, p = p 0 +Δp, sends a driving transformer working instruction to the controller, and the transformer working state will change; the controller controls the transformer working state according to the received instruction. When the transformer receives an instruction to change its working state, it first performs the valve core opening action to make the second core body and the second gasket in a non-contact state to open the sealing channel between the bottom valve core platform and the second core body; then fills the rubber inner ring with fluid through the fluid delivery pipe until the fluid pressure of the annular pressure cavity inside the rubber inner ring is equal to p; then removes the valve core opening action, and the second core body will resume the close contact state with the second gasket under the action of the spring tension to prevent the fluid inside the rubber inner ring from leaking out.

[0041] Example 2

[0042] Reference Figures 3 to 12As shown, a fluid pressure driven controllable rubber sealing device includes a rubber outer ring 2, a pressure regulating device and a monitoring and control system. The rubber outer ring 2 has an annular cavity inside and an annular notch at the outer diameter, and the annular notch is connected to the annular cavity; the pressure regulating device includes a rubber inner ring 3, a fluid delivery pipe 4, and a valve core 5; the rubber inner ring 3 has an annular pressure cavity inside and a through hole at the outer diameter, and the through hole is connected to the annular pressure cavity and bonded to one end of the fluid delivery pipe 4; the outer surface of the bonding end of the fluid delivery pipe 4 has a groove, and the middle section has an internal thread 41; the valve core 5 includes a threaded cap 51, a core rod 52, and a first core body 53. , a second core body 54, a first gasket 55, a spring 56, a second gasket 57, and a bottom valve core platform 58; the core rod 52 has a first external thread 521 at one end, a second external thread 523 at the other end, and a baffle 522 in the middle; a crossbeam is provided at one end of the first core body 53, and a through hole is provided on the crossbeam; a groove is provided on the outer surface of one end of the second core body 54, a third external thread 541 is provided on the outer surface of the other end, a through hole is provided at the bottom, and an annular groove is provided on the outer surface of the middle section; the other end of the first core body 53 is embedded in the second core body 54 The bottom valve core platform 58 has an annular groove and a threaded hole on its surface; one end of the core rod 52 passes through the through hole on the crossbeam of the first core body 53 and is screwed to the threaded cap 51 through the first external thread 521; the other end of the core rod 52 passes through the spring 56 and the through hole at the bottom of the second core body 54 in turn, and is connected and fixed to the threaded hole of the bottom valve core platform 58 through the second external thread 523; the first gasket 55 is installed in the annular groove in the middle section of the second core body 54, and fits with the inner surface of the fluid delivery pipe 4; the second gasket 5 7 is installed in the annular groove on the surface of the bottom valve core platform 58, and is fitted with the outer surface of the bottom of the second core body 54; one end of the spring 56 is fitted with the inner surface of the bottom of the second core body 54, and the other end is in contact with the baffle 522; the fluid delivery pipe 4 is connected and fixed to the valve core 5 through the internal thread 41 and the third external thread 541; the materials made of the rubber outer ring 2 and the rubber inner ring 3 include nitrile rubber, EPDM rubber, silicone rubber, and fluororubber; the bonding method of the rubber inner ring 3 and the fluid delivery pipe 4 includes hot pressing, gluing, and rubber encapsulation;

[0043] The monitoring and control system includes a monitoring device 6, a microprocessor 7, a controller 8, and a transformer 9; the monitoring device 6 is used to monitor the leakage of the seal; the microprocessor 7 is used to analyze the change in the leakage and calculate the fluid pressure value required to be output by the transformer 9; the controller 8 is used to control the working state of the transformer 9; the transformer 9 is used to output fluid pressure and drive the valve core 5 to move so as to change the fluid pressure value of the annular pressure cavity inside the rubber inner ring 3; the connection method between the other end of the bonding end of the fluid delivery pipe 4 and the transformer 9 includes threaded connection, welding, bonding, and buckle ring connection; the fluid output by the transformer 9 includes liquid, gas, and gel.

[0044] The specific control principle of the present invention is: the monitoring device uses a sensor to measure the leakage Q of the seal, the fluid pressure p of the annular pressure cavity inside the rubber inner ring, and the 0 and sends it to the microprocessor; the microprocessor compares the measured leakage volume Q with its internal preset leakage volume threshold Q 0 Compare and calculate the compensation pressure Δp and transformer output pressure p; if Q≤Q 0 , the microprocessor determines that the seal leakage does not exceed the standard, and p = p 0 , send a command to the controller not to drive the transformer device, and the working state of the transformer device will not change; if Q>Q 0 , the microprocessor determines that the seal leakage has exceeded the limit, and the microprocessor uses the internal preset program to calculate the compensation pressure Δp. At this time, p = p 0 +Δp, sends a driving transformer working instruction to the controller, and the transformer working state will change; the controller controls the transformer working state according to the received instruction. When the transformer receives an instruction to change its working state, it first performs the valve core opening action to make the second core body and the second gasket in a non-contact state to open the sealing channel between the bottom valve core platform and the second core body; then fills the rubber inner ring with fluid through the fluid delivery pipe until the fluid pressure of the annular pressure cavity inside the rubber inner ring is equal to p; then removes the valve core opening action, and the second core body will resume the close contact state with the second gasket under the action of the spring tension to prevent the fluid inside the rubber inner ring from leaking out.

[0045] The above description is only a preferred embodiment of the present invention and is not limited to the specific forms described in the embodiments. For those skilled in the art, the present invention may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fluid pressure driven controllable rubber sealing device, comprising a sealing ring, a pressure regulating device and a monitoring and control system; The sealing ring comprises a plastic ring (1) and a rubber outer ring (2); a sealing lip is provided at the inner diameter of the plastic ring (1), and the cross-sectional shape of the sealing lip is an asymmetric V-shape; an annular cavity is provided inside the rubber outer ring (2), and an annular notch is provided at the outer diameter, and the annular notch is communicated with the annular cavity; The pressure regulating device comprises a rubber inner ring (3), a fluid delivery pipe (4), and a valve core (5); an annular pressure cavity is provided inside the rubber inner ring (3), and a through hole is provided at the outer diameter thereof; the through hole is communicated with the annular pressure cavity and is bonded to one end of the fluid delivery pipe (4); a groove is provided on the outer surface of the bonding end of the fluid delivery pipe (4), and an internal thread (41) is provided in the middle section; the valve core (5) comprises a threaded cap (51), a core rod (52), a first core body (53), a second core body (54), a first gasket (5 5), a spring (56), a second gasket (57), and a bottom valve core platform (58); the core rod (52) has a first external thread (521) at one end, a second external thread (523) at the other end, and a baffle (522) in the middle; the first core body (53) has a crossbeam at one end, and a through hole is formed on the crossbeam; the second core body (54) has a groove on its outer surface at one end, a third external thread (541) on its outer surface at the other end, a through hole at the bottom, and an annular groove on its outer surface in the middle; the first core body (53) has a crossbeam at one end, and a through hole is formed on the crossbeam; the second core body (54) has a groove on its outer surface at one end, a third external thread (541) on its outer surface at the other end, a through hole at the bottom, and an annular groove on its outer surface in the middle; ) is embedded in a groove at one end of the second core body (54); an annular groove and a threaded hole are provided on the surface of the bottom valve core platform (58); one end of the core rod (52) passes through the through hole on the cross beam of the first core body (53) and is screwed to the threaded cap (51) via a first external thread (521); the other end of the core rod (52) passes through the spring (56) and the through hole at the bottom of the second core body (54) in turn, and is connected and fixed to the threaded hole of the bottom valve core platform (58) via a second external thread (523); the first gasket (5 5) is installed in the annular groove in the middle section of the second core body (54) and fits with the inner surface of the fluid delivery pipe (4); the second gasket (57) is installed in the annular groove on the surface of the bottom valve core platform (58) and fits with the outer surface of the bottom of the second core body (54); one end of the spring (56) fits with the inner surface of the bottom of the second core body (54), and the other end contacts the baffle (522); the fluid delivery pipe (4) is connected and fixed to the valve core (5) through the internal thread (41) and the third external thread (541); The monitoring and control system comprises a monitoring device (6), a microprocessor (7), a controller (8), and a pressure-changing device (9); the monitoring device (6) is used to monitor the leakage of the seal; the microprocessor (7) is used to analyze the change in the leakage and calculate the fluid pressure value required to be output by the pressure-changing device (9); the controller (8) is used to control the working state of the pressure-changing device (9); the pressure-changing device (9) is used to output fluid pressure and drive the valve core (5) to move so as to change the fluid pressure value of the annular pressure cavity inside the rubber inner ring (3).

2. A fluid pressure driven controllable rubber sealing device as claimed in claim 1, characterized in that: The plastic ring (1) is made of materials including polytetrafluoroethylene, polyurethane, polyetheretherketone, nitrile rubber, EPDM rubber, silicone rubber, and fluororubber; the number of sealing lips at the inner diameter of the plastic ring (1) is 1 to 10; the rubber outer ring (2) and the rubber inner ring (3) are made of materials including nitrile rubber, EPDM rubber, silicone rubber, and fluororubber.

3. A fluid pressure driven controllable rubber sealing device as claimed in claim 1, characterized in that: The bonding method of the rubber inner ring (3) and the fluid delivery pipe (4) includes hot pressing, gluing, and rubber encapsulation.

4. A fluid pressure driven controllable rubber sealing device as claimed in claim 1, characterized in that: The connection method between the other end of the bonding end of the fluid delivery pipe (4) and the voltage conversion device (9) includes threaded connection, welding, bonding, and buckle ring connection.

5. A fluid pressure driven controllable rubber sealing device as claimed in claim 1, characterized in that: The fluid output by the pressure changing device (9) includes liquid, gas and gel.

6. A control method for a fluid pressure driven controllable rubber sealing device according to any one of the above claims, characterized in that: The steps include: (1) The monitoring device uses a sensor to measure the seal leakage Q and the fluid pressure p0 of the annular pressure cavity inside the rubber inner ring, and sends them to the microprocessor; the microprocessor compares the measured leakage Q with its internal preset leakage threshold Q0, and calculates the compensation pressure Δp and the transformer output pressure p; If Q≤Q0, the microprocessor determines that the leakage of the seal does not exceed the standard, at this time p=p0, and sends a command to the controller not to drive the transformer device, and the working state of the transformer device will not change; if Q>Q0, the microprocessor determines that the leakage of the seal has exceeded the standard, and the microprocessor uses the internal preset program to calculate the compensation pressure Δp, at this time p=p0+Δp, and sends a command to the controller to drive the transformer device, and the working state of the transformer device will change; the controller controls the working state of the transformer device according to the received command; (2) When the transformer receives an instruction to change its working state, it first performs the valve core opening action to put the second core body and the second gasket in a non-contact state, so as to open the sealing channel between the bottom valve core platform and the second core body; then, fluid is filled into the rubber inner ring through the fluid delivery pipe until the fluid pressure in the annular pressure cavity inside the rubber inner ring is equal to p; then, the valve core opening action is removed, and the second core body will resume the close contact state with the second gasket under the action of the spring tension, so as to prevent the fluid inside the rubber inner ring from leaking out.

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