Intelligent self-compensating sealed piston pneumatic actuator

Abstract

The application discloses a kind of intelligent self-compensation sealed piston type pneumatic actuator, it is related to pneumatic piston technical field, including sliding piston, air passage and sealing ring, the air inlet of sliding piston top is connected with air outlet by air passage, the air outlet is used to guide high-pressure gas in the containing groove of sealing ring inside, the annular spring in the sealing ring is attached with the sealing groove of sliding piston, the sealing ring is connected with sliding piston by first side ring and second side ring.The application is equipped with sliding piston, air passage, sealing ring, annular spring, sealing cover, solenoid valve, first pressure sensor and second pressure sensor, realizes the intelligent automatic compensation adjustment and accurate control of sealing pressure, avoids excessive wear or damage of sealing ring due to excessive pressure, also prevents gas leakage due to insufficient pressure, improves sealing reliability, prolongs the service life of sealing ring.

Description

Technical Field

[0001] This invention relates to the field of pneumatic piston technology, specifically to an intelligent self-compensating sealed piston-type pneumatic actuator. Background Technology

[0002] As an important actuator in industrial automation control systems, pneumatic actuators are widely used in valve control, material conveying and mechanical drive. They convert the pressure energy of the gas into mechanical energy by compressing gas to drive the piston to make reciprocating linear motion in the cylinder, thereby driving the external mechanism to complete the corresponding action. In pneumatic actuators, the sealing performance between the piston and the inner wall of the cylinder is the key factor that determines the working efficiency, response speed and service life.

[0003] In actual use, traditional piston-type pneumatic actuators experience wear, aging, or permanent deformation of the sealing rings due to fluctuations in working pressure, increases in the number of piston reciprocating motions, and changes in operating conditions. This leads to a gradual decline in sealing performance and gas leakage. Furthermore, traditional sealing structures often use a fixed preload, making it impossible to adjust the sealing ring's tightness in real time according to actual operating conditions. Under low-pressure conditions, excessive preload may increase frictional resistance, while under high-pressure conditions, insufficient preload may cause leakage. It is difficult to balance sealing performance and energy consumption.

[0004] Patent CN104265919B discloses a valve core and a fast exhaust valve and pneumatic piston actuator using the valve core. The above patent achieves the prevention of valve core tilting.

[0005] The aforementioned patent uses circumferentially spaced limiting protrusions on the circumferential surface of the valve core body. When the lip is deformed by gas pressure, causing the gap between the valve core and the inner wall of the valve cavity to increase, the guiding effect of the limiting protrusions can straighten the valve core and prevent it from tilting. However, there is still room for optimization in adjusting the tightness of the sealing ring.

[0006] Therefore, this application proposes an intelligent self-compensating sealing piston pneumatic actuator that adjusts the tightness of the sealing ring according to actual working conditions. Summary of the Invention

[0007] The purpose of this invention is to provide an intelligent self-compensating sealed piston pneumatic actuator to solve the technical problems mentioned in the background art, namely, that traditional piston pneumatic actuators cannot adjust the tightness of the sealing ring in real time according to actual working conditions, and may increase frictional resistance due to excessive preload under low-pressure conditions, and may leak due to insufficient preload under high-pressure conditions.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an intelligent self-compensating sealed piston pneumatic actuator, comprising a sliding piston, a vent passage, and a sealing ring. The sliding piston is disposed inside a cylinder. The top end of the sliding piston is connected to a sealing cover via an annular groove. The opening and closing port of the sealing cover is connected to a solenoid valve. The air inlet at the top end of the sliding piston is connected to an air outlet via the vent passage. The air outlet is used to guide high-pressure gas into a receiving groove inside the sealing ring. An annular spring inside the sealing ring is in contact with the sealing groove of the sliding piston. The sealing ring is connected to the sliding piston via a first side ring and a second side ring. The sliding piston is connected to a first guide ring and a second guide ring via a first guide groove and a second guide groove. The first guide ring and the second guide ring are in contact with the cylinder.

[0009] Preferably, the top of the outer wall of the sliding piston is provided with an annular groove, the inner side of the annular groove is provided with a threaded groove, the threaded groove engages with the internal thread of the sealing cap, the internal thread is provided on the inner side of the sealing cap, and the top of the outer wall of the sealing cap is provided with a circular opening, on which a solenoid valve is provided.

[0010] Preferably, the top of the outer wall of the sliding piston is provided with an air inlet, which is connected to the top of the air passage. The air passage is located inside the sliding piston, and the bottom of the air passage is connected to the air outlet. The air outlet is located on the side of the inner wall of the sealing groove, and the sealing groove is located on the side of the outer wall of the sliding piston.

[0011] Preferably, the sealing groove is an annular groove, and an annular spring is provided in the middle of the inner wall of the sealing groove. The inner circular surface of the annular spring is in contact with the inner wall of the sealing groove, and the outer circular surface of the annular spring is in contact with the inner wall of the receiving groove of the sealing ring. The receiving groove is provided on the side of the inner wall of the sealing ring.

[0012] Preferably, the outer wall of the sealing ring is provided with a first side ring and a second side ring on both sides, the inner walls of the first side ring and the second side ring are in contact with the inner wall of the sealing groove, the outer wall of the first side ring is in contact with the inner wall of the first pressing ring, and the outer wall of the second side ring is in contact with the inner wall of the second pressing ring.

[0013] Preferably, the first clamping ring and the second clamping ring are the same size. The first clamping ring is a circular ring with an opening. The opening of the first clamping ring is provided with a first locking head and a second locking head. The outer walls of the first locking head and the second locking head are provided with screw holes. The bolt passes through the screw holes of the first locking head and the second locking head to fix the first clamping ring to the outside of the first side ring. The bottom end of the bolt is provided with a nut.

[0014] Preferably, the outer wall of the sliding piston is provided with a first guide groove and a second guide groove. The first guide groove is located above the sealing groove, and the second guide groove is located below the sealing groove. A first guide ring is provided in the first guide groove, and a second guide ring is provided in the second guide groove.

[0015] Preferably, the outer surfaces of the first guide ring and the second guide ring are in contact with the inner wall of the cylinder. A sliding piston is provided inside the cylinder. The sliding piston is in close contact with the inner wall of the cylinder through a sealing ring. The sliding piston divides the inside of the cylinder into a first air chamber and a second air chamber. The gas in the first air chamber is in contact with the sealing cover.

[0016] Preferably, a second pressure sensor is provided at the top of the outer wall of the sealing cover. The second pressure sensor is used to detect the air pressure value in the first air chamber. A first pressure sensor is provided at the top of the outer wall of the sliding piston. The first pressure sensor is used to detect the pressure value in the sealing ring. The first pressure sensor, the second pressure sensor, and the solenoid valve are connected to an external control console through an external connecting line.

[0017] Preferably, the cylinder outer wall side is provided with a first delivery pipe and a second delivery pipe. The first delivery pipe passes through the cylinder and is connected to the first air chamber, and the second delivery pipe passes through the cylinder and is connected to the second air chamber. The first delivery pipe and the second delivery pipe are respectively connected to an external air pump, and a connecting rod is provided at the bottom end of the outer wall of the sliding piston.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention, by installing a sliding piston, an air inlet, an air outlet, a ventilation channel, a sealing groove, and a sealing ring, achieves the function of dynamically adjusting the tightness of the sealing ring based on the pressure of the working gas itself. This solves the problem of the fixed sealing force of traditional pneumatic actuators, which cannot adaptively adjust with changes in working conditions. When high-pressure gas enters the cylinder and drives the piston, the gas simultaneously flows from the air inlet through the ventilation channel to the air outlet, and finally enters the receiving groove inside the sealing ring. As the working pressure increases, the air pressure inside the sealing ring increases synchronously, causing the sealing ring to expand outward and fit more tightly against the inner wall of the cylinder. This achieves an adaptive effect of tighter sealing as the pressure increases. By converting the driving medium into the sealing medium, real-time adjustment of the sealing force can be achieved without adding an additional power source, ensuring reliable sealing under high-pressure conditions and avoiding friction loss and energy waste caused by excessive preload under low-pressure conditions. This improves the adaptability and operating efficiency of the actuator under different working conditions and extends the service life of the seals.

[0020] 2. This invention, by installing a ring spring, a sliding piston, a sealing ring, a sealing groove, and a receiving groove, achieves automatic pre-tightening of the sealing ring during the initial inflation stage and in the absence of air pressure, preventing premature gas leakage. It solves the problem that when the sealing ring has not yet entered the cylinder, the seal is not tightly fitted to the inner wall, making it impossible to establish an effective initial seal. The ring spring is pre-installed in the middle of the inner wall of the sealing groove, and its outer surface fits tightly against the receiving groove on the inner wall of the sealing ring. During the non-air-entry or initial inflation stage, the ring spring applies a continuous radial pre-tightening force to the sealing ring using its own elastic expansion force, ensuring that the outer wall of the sealing ring remains in close contact with the inner wall of the cylinder, forming a reliable static seal. This effectively compensates for the response delay of the gas-driven seal at the moment of startup, prevents premature leakage of high-pressure gas during seal establishment, and ensures the rapid pressure-building capability of the actuator upon startup. Simultaneously, the receiving groove limits the ring spring, preventing axial movement or displacement during piston reciprocating motion, ensuring the uniformity and stability of the ring spring pressure, and improving the reliability and durability of the seal.

[0021] 3. This invention, by installing a first clamping ring, a second clamping ring, a first locking head, a second locking head, and bolts, achieves dual axial and radial locking and fixing of the sealing ring, preventing it from being squeezed out or displaced during high-pressure gas impact and reciprocating motion. It solves the problem that when relying solely on elastic elements and air pressure for clamping, the sealing ring may loosen, detach, or twist and deform during high-frequency reciprocating motion, leading to sealing failure. The first and second clamping rings are respectively fitted onto the outer sides of the first and second side rings on both sides of the sealing ring. Bolts are passed through the screw holes of the first and second locking heads and tightened, ensuring the two clamping rings are locked in place. The tightening ring tightly hugs both ends of the sealing ring, not only applying a uniform clamping force to the sealing ring radially, enhancing the fit between the sealing ring and the inner wall of the sealing groove, but also limiting the sealing ring axially, preventing the sealing ring from axially shifting or rolling due to frictional resistance and air pressure fluctuations during the piston's reciprocating motion. The double locking structure ensures that the sealing ring is always in a fixed position, maintaining a stable sealing form even under harsh working conditions of high frequency, high pressure and high impact, effectively preventing gas leakage from the contact surface between the sealing ring and the sealing groove, and improving the sealing reliability and long-term operational stability of the actuator.

[0022] 4. This invention, by installing a sealing cover, a sliding piston, a solenoid valve, a first pressure sensor, and a second pressure sensor, achieves precise detection and intelligent control of the internal pressure of the sealing ring. It automatically adjusts the sealing strength according to operating conditions, solving the problems of inaccurate control of the gas pressure entering the sealing ring, which leads to excessive expansion, accelerated aging, and damage due to excessive pressure, or insufficient sealing and leakage due to insufficient pressure. The first pressure sensor detects the gas pressure value of the internal receiving groove of the sealing ring in real time, and the second pressure sensor detects the working pressure of the first gas chamber. The data from both pressure sensors are transmitted to an external control console in real time. The control console, based on a preset standard sealing mode or a strong sealing mode, controls the opening and closing of the switch port through the solenoid valve to adjust the amount of high-pressure gas entering the sealing ring, ensuring that the internal pressure of the sealing ring is always maintained within the target threshold range. When it is necessary to reduce the sealing strength to save energy or protect the sealing components, the equipment can automatically vent and depressurize, achieving precise matching and dynamic optimization of the sealing force. This avoids damage to the sealing ring due to overpressure, extends its service life, improves the intelligence level and environmental adaptability of the actuator, and reduces manual intervention and maintenance costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the connection structure between the sliding piston and the cylinder of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the sealing cap being pulled out from the sliding piston according to the present invention;

[0026] Figure 4 This is a schematic diagram of the guide ring being pulled out of the sliding piston according to the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the clamping ring being pulled out of the sliding piston according to the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the sealing ring being pulled out of the sliding piston according to the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the annular spring being pulled out of the sealing ring according to the present invention;

[0030] Figure 8 This is a schematic diagram of the sliding piston structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the sealing cap structure of the present invention;

[0032] Figure 10 This is a schematic diagram of the first clamping ring structure of the present invention;

[0033] Figure 11 This is a schematic cross-sectional view of the sliding piston of the present invention.

[0034] In the diagram: 1. Sliding piston; 2. Air inlet; 3. Air outlet; 4. Annular groove; 5. First guide groove; 6. Second guide groove; 7. Sealing groove; 8. Sealing ring; 9. First side ring; 10. Second side ring; 11. Receiving groove; 12. Annular spring; 13. First clamping ring; 14. Second clamping ring; 15. First locking head; 16. Second locking head; 17. Bolt; 18. First guide ring; 19. Second guide ring; 20. Sealing cap; 21. Solenoid valve; 22. Threaded groove; 23. Internal thread; 24. Switch port; 25. Cylinder; 26. First delivery pipe; 27. Second delivery pipe; 28. First pressure sensor; 29. ​​Second pressure sensor; 30. Vent; 31. Connecting rod; 32. First air chamber; 33. Second air chamber. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The present invention provides an embodiment of an intelligent self-compensating sealed piston pneumatic actuator, wherein the sliding piston 1 is disposed inside the cylinder 25, the top end of the sliding piston 1 is connected to the sealing cover 20 through an annular groove 4, the air inlet 2 at the top end of the sliding piston 1 is connected to the air outlet 3 through the air passage 30, the annular spring 12 inside the sealing ring 8 is in contact with the sealing groove 7 of the sliding piston 1, the sealing ring 8 is connected to the sliding piston 1 through the first side ring 9 and the second side ring 10, the sliding piston 1 is connected to the first guide ring 18 and the second guide ring 19 through the first guide groove 5 and the second guide groove 6, and the first guide ring 18 and the second guide ring 19 are in contact with the cylinder 25;

[0039] Furthermore, the operator first seals the sliding piston 1, inserting the annular spring 12 into the middle position of the inner wall of the sealing groove 7, so that the inner circular surface of the annular spring 12 fits tightly against the inner wall of the sealing groove 7, ensuring that the annular spring 12 will not shift or loosen after installation. The annular spring 12 provides pre-tightening force for the subsequent sealing ring 8, which can maintain the initial contact between the sealing ring 8 and the inner wall of the cylinder 25 when not inflated, playing a pre-sealing role, preventing gas from leaking from the tiny gap between the sealing ring 8 and the cylinder 25 in the initial state, and improving the sealing reliability in the initial state.

[0040] Then, the operator puts the sealing ring 8 on the outside of the sealing groove 7. During the installation process, ensure that the receiving groove 11 on the inner wall of the sealing ring 8 fits in close contact with the outer circular surface of the ring spring 12. The receiving groove 11 can accommodate the ring spring 12, preventing the ring spring 12 from shifting inside the sealing ring 8. This ensures that the ring spring 12 applies uniform pressure to the sealing ring 8. At the same time, the first side ring 9 and the second side ring 10 on both sides of the sealing ring 8 are respectively attached to the inner walls of both sides of the sealing groove 7. The first side ring 9 and the second side ring 10 not only increase the contact area between the sealing ring 8 and the sealing groove 7, but also play a limiting role, preventing the sealing ring 8 from axially moving during the reciprocating motion of the sliding piston 1. This ensures that the sealing ring 8 is always in the optimal working position, improving the stability and service life of the seal.

[0041] Then, the sealing ring 8 is fixed. The operator places the first clamping ring 13 on the outside of the first side ring 9 and the second clamping ring 14 on the outside of the second side ring 10. Both the first clamping ring 13 and the second clamping ring 14 are circular ring structures with openings. The openings are respectively provided with a first locking head 15 and a second locking head 16. The operator passes the bolt 17 through the screw holes of the first locking head 15 and the second locking head 16, and tightens the nut at the bottom of the bolt 17, so that the first clamping ring 13 and the second clamping ring 14 tightly hug the first side ring 9 and the second side ring 10. On the outside of 10, the first clamping ring 13 and the second clamping ring 14 apply radial pressure to the first side ring 9 and the second side ring 10 through the tightening force of the bolt 17, thereby fixing the sealing ring 8 in the sealing groove 7, preventing the sealing ring 8 from coming off or shifting under the action of high pressure gas. Moreover, the tightening effect of the first clamping ring 13 and the second clamping ring 14 can also compress the sealing ring 8, making the fit between the sealing ring 8 and the sealing groove 7 tighter, effectively preventing gas from leaking from the contact surface between the sealing ring 8 and the sealing groove 7, and improving the overall sealing performance.

[0042] The operator then inserts the first guide ring 18 into the first guide groove 5 on the outer wall of the sliding piston 1, and the second guide ring 19 into the second guide groove 6. The first guide ring 18 and the second guide ring 19 are made of wear-resistant material, PTFE (polytetrafluoroethylene), which reduces friction with the inner wall of the cylinder 25 during the reciprocating motion of the sliding piston 1, reducing wear and extending the service life of the sliding piston 1 and the cylinder 25. Simultaneously, the first guide ring 18 and the second guide ring 19 have a guiding function, ensuring that the sliding piston 1 moves smoothly along the axis within the cylinder 25, preventing the sliding piston 1 from deviating or jamming. The lag ensures the motion accuracy and stability of the actuator. Then, the sealing cover 20 is connected to the top of the sliding piston 1 through the annular groove 4. The internal thread 23 of the inner wall of the sealing cover 20 meshes with the thread groove 22 of the inner wall of the annular groove 4. By rotating, the sealing cover 20 is fixed to the top of the sliding piston 1. Finally, the operator slowly puts the installed sliding piston 1 into the cylinder 25. During the insertion process, it is ensured that the outer circular surfaces of the first guide ring 18 and the second guide ring 19 fit well with the inner wall of the cylinder 25. At the same time, the outer wall of the sealing ring 8 keeps in contact with the inner wall of the cylinder 25, laying a solid foundation for subsequent efficient and stable operation.

[0043] Please see Figure 2 , Figure 3 , Figure 7 , Figure 8 , Figure 9 and Figure 10An embodiment of the present invention provides an intelligent self-compensating sealed piston pneumatic actuator, wherein the top of the outer wall of the sliding piston 1 is provided with an annular groove 4, the inner side of the annular groove 4 is provided with a threaded groove 22, the threaded groove 22 meshes with the internal thread 23 of the sealing cover 20, the internal thread 23 is provided on the inner side of the sealing cover 20, the top of the outer wall of the sealing cover 20 is provided with a circular switch port 24, the switch port 24 is provided with a solenoid valve 21, the top of the outer wall of the sliding piston 1 is provided with an air inlet 2, the air inlet 2 is connected to the air outlet 3 through a vent 30, the air outlet 3 is provided on the inner side of the sealing groove 7, and the sealing groove 7 is provided on the outer side of the sliding piston 1;

[0044] Furthermore, when the pneumatic actuator is started, the operator sends an opening command to the solenoid valve 21 through the control console. The control console sends the command to the solenoid valve 21 through the connecting line. After receiving the signal, the solenoid valve 21 quickly opens the switch port 24, allowing the external high-pressure gas to enter the air inlet 2 at the top of the sliding piston 1. At the same time, the control console starts the external air pump through the connecting line, and the air pump starts to work.

[0045] During the process of gas entering cylinder 25, the first pressure sensor 28 detects the gas pressure value in the internal receiving groove 11 of sealing ring 8 in real time, and transmits the detected pressure signal to the control console in real time through the connecting line. The control console has two preset sealing working modes, namely standard sealing mode and strong sealing mode, to adapt to the sealing requirements under different working conditions. The standard sealing mode is suitable for working environments under general pressure conditions, with a low preset pressure threshold, such as 0.3MPa, while the strong sealing mode is suitable for working conditions with high pressure or high leakage risk, with a high preset pressure threshold, such as 0.8MPa. The operator selects the appropriate sealing mode through the control console according to the actual working needs.

[0046] When the operator selects the standard sealing mode, the control panel continuously receives the pressure signal transmitted by the first pressure sensor 28. Through the action of an external air pump, gas is input into the first air chamber 32 via the first delivery pipe 26. High-pressure gas enters the ventilation channel 30 through the air inlet 2, then flows through the ventilation channel 30 to the air outlet 3, and finally enters the receiving groove 11 inside the sealing ring 8. As gas continuously enters, the pressure inside the receiving groove 11 gradually increases. Under the action of the internal gas pressure, the sealing ring 8 begins to expand outward, gradually pressing against the inner wall of the cylinder 25 to form an effective seal. When the first pressure sensor... When the pressure value detected by sensor 28 reaches the preset 0.3MPa of the standard sealing mode, the control panel immediately sends a closing command to solenoid valve 21. Solenoid valve 21 responds quickly, closes switch port 24, and cuts off the channel for high-pressure gas to continue entering the sealing ring 8. This prevents the sealing ring 8 from over-expanding due to over-inflation, avoids accelerated aging or damage of the sealing ring 8 material due to excessive pressure, thereby extending the service life of the sealing ring 8. At the same time, it ensures that the sealing ring 8 maintains an appropriate sealing pressure under standard operating conditions, which satisfies the sealing requirements without excessively consuming gas source energy, thus achieving a balance between energy saving and sealing.

[0047] When the operator selects the high-pressure sealing mode according to the working conditions, the control console also receives the pressure signal from the first pressure sensor 28 in real time. High-pressure gas enters the sealing ring 8, and the sealing ring 8 continues to expand. The pressure against the inner wall of the cylinder 25 also increases accordingly. The control console continuously compares the real-time pressure value with the preset pressure threshold of the high-pressure sealing mode. When the detected pressure value reaches the preset 0.8MPa of the high-pressure sealing mode, the control console immediately sends a closing command to the solenoid valve 21. The solenoid valve 21 closes the switch port 24, stopping the continued entry of high-pressure gas. At this time, the high pressure inside the sealing ring 8 is maintained at 0.8MPa, so that a strong sealing force is formed between the sealing ring 8 and the inner wall of the cylinder 25. This can effectively cope with high-pressure working environments or working conditions with a large risk of leakage, ensuring that the actuator can maintain good sealing performance under harsh conditions, preventing the decrease in working efficiency or safety accidents caused by gas leakage. The gas pressure inside the sealing ring 8 is automatically adjusted according to the actual working conditions to achieve adaptive adjustment of the sealing strength. This not only ensures the sealing effect, but also avoids energy waste and excessive wear of the sealing parts, improving the intelligence level and operating economy of the pneumatic actuator.

[0048] Please see Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8An embodiment of the present invention provides an intelligent self-compensating sealed piston pneumatic actuator, wherein a first side ring 9 and a second side ring 10 are provided on both sides of the outer wall of the sealing ring 8, the outer wall of the first side ring 9 is in contact with the inner wall of the first pressing ring 13, the outer wall of the second side ring 10 is in contact with the inner wall of the second pressing ring 14, a first locking head 15 and a second locking head 16 are provided at the opening of the first pressing ring 13, and the outer walls of the first locking head 15 and the second locking head 16 are provided with screw holes, and a bolt 17 passes through the screw holes of the first locking head 15 and the second locking head 16 to fix the first pressing ring 13 to the outside of the first side ring 9;

[0049] Furthermore, when the gas pressure in the receiving groove 11 inside the sealing ring 8 reaches the preset threshold of the control console, the sealing ring 8 expands outward under the action of the internal high-pressure gas. The outer wall of the sealing ring 8 tightly fits the inner wall of the cylinder 25, forming a reliable sealing interface. At the same time, the ring spring 12 applies an outward pre-tightening force to the sealing ring 8, so that the sealing ring 8 maintains contact pressure with the inner wall of the cylinder 25 in the uninflated state, playing an auxiliary sealing role. When the high-pressure gas enters the receiving groove 11, the ring spring 12 and the gas pressure work together to enhance the tightness of the fit between the sealing ring 8 and the inner wall of the cylinder 25, ensuring that the sealing ring 8 can still maintain good sealing performance under the impact of high-pressure gas, preventing gas from leaking from the gap between the sliding piston 1 and the cylinder 25, and improving the working reliability and efficiency of the actuator.

[0050] While the sealing ring 8 forms an effective seal, the control console controls the external air pump to supply air to the first delivery pipe 26 and exhaust air to the second delivery pipe 27 via the connecting line. High-pressure gas enters the first air chamber 32 through the first delivery pipe 26, causing the pressure in the first air chamber 32 to rise rapidly. Meanwhile, the exhaust from the second delivery pipe 27 causes the pressure in the second air chamber 33 to decrease. Driven by the high-pressure gas in the first air chamber 32, the sliding piston 1 begins to move towards the second air chamber 33, causing the connecting rod 31 to extend outward, thereby driving the external mechanism.

[0051] During the movement of the sliding piston 1, the first guide ring 18 is set in the first guide groove 5, located above the sealing groove 7, and the second guide ring 19 is set in the second guide groove 6, located below the sealing groove 7. Both the first guide ring 18 and the second guide ring 19 are in contact with the inner wall of the cylinder 25. When the sliding piston 1 reciprocates in the cylinder 25, the first guide ring 18 and the second guide ring 19 can ensure that the sliding piston 1 always moves smoothly along the axis of the cylinder 25, preventing the sliding piston 1 from deflecting or getting stuck due to uneven force.

[0052] Meanwhile, the sealing ring 8 continuously performs a sealing function during the movement of the sliding piston 1. The sealing ring 8 is filled with high-pressure gas, and the outer wall of the sealing ring 8 is always in close contact with the inner wall of the cylinder 25, forming a dynamic seal. When the sliding piston 1 moves, the sealing ring 8 moves with the sliding piston 1 and maintains close contact with the inner wall of the cylinder 25, effectively isolating the first air chamber 32 and the second air chamber 33, preventing high-pressure gas from leaking from the gap between the sealing ring 8 and the cylinder 25. The dynamic sealing performance of the sealing ring 8 improves the working efficiency and reliability of the actuator, ensures the stability of the pressure difference between the first air chamber 32 and the second air chamber 33, enables the sliding piston 1 to obtain a stable driving force, and ensures that the connecting rod 31 outputs displacement and force smoothly, meeting the needs of various industrial automation control.

[0053] Please see Figure 2 , Figure 7 , Figure 8 and Figure 11 An embodiment of the present invention provides an intelligent self-compensating sealed piston pneumatic actuator, wherein the outer wall of the sliding piston 1 is provided with a first guide groove 5 and a second guide groove 6, a first guide ring 18 is provided in the first guide groove 5, and a second guide ring 19 is provided in the second guide groove 6. The outer circular surfaces of the first guide ring 18 and the second guide ring 19 are in close contact with the inner wall of the cylinder 25. The sliding piston 1 is provided inside the cylinder 25, and the sliding piston 1 is in close contact with the inner wall of the cylinder 25 through a sealing ring 8. The sliding piston 1 divides the inside of the cylinder 25 into a first air chamber 32 and a second air chamber 33.

[0054] Furthermore, in the process of industrial automated production, the operating conditions often change. When the operating conditions change from low pressure to high pressure, the sealing strength in cylinder 25 needs to be improved. The control console switches from standard sealing mode to strong sealing mode according to the operator's instructions to meet the sealing requirements under high pressure. When the control console receives the mode switching instruction, the control console collects the pressure data of the first pressure sensor 28 and the second pressure sensor 29 in real time.

[0055] During mode switching, the control console continuously monitors the intake and exhaust status of the first delivery pipe 26 and the second delivery pipe 27. When the second delivery pipe 27 is inlet and the first delivery pipe 26 is outlet, high-pressure gas enters the second air chamber 33, causing the pressure in the second air chamber 33 to rise. At the same time, the pressure in the first air chamber 32 decreases, and the sliding piston 1 moves towards the first air chamber 32. At this time, the control console detects the pressure value P1 in the sealing ring 8 through the first pressure sensor 28 and the pressure value P2 in the first air chamber 32 through the second pressure sensor 29. The control console compares and determines that P1 is greater than P2, indicating that the pressure in the sealing ring 8 is higher than the pressure in the first air chamber 32. The control console does not open the switch port 24 controlled by the solenoid valve 21 to prevent the high-pressure gas in the sealing ring 8 from flowing out in reverse through the outlet port 3, the vent 30 and the inlet port 2, thus avoiding a decrease in sealing strength and ensuring that the sealing ring 8 can still maintain good sealing performance under the current working conditions.

[0056] When the second delivery pipe 27 exhausts gas and the first delivery pipe 26 intakes gas, high-pressure gas enters the first gas chamber 32, causing the pressure in the first gas chamber 32 to rise. At the same time, the pressure in the second gas chamber 33 decreases, and the sliding piston 1 moves towards the second gas chamber 33. At this time, the control console detects that the pressure value P1 of the first pressure sensor 28 is less than the pressure value P2 of the second pressure sensor 29. The pressure inside the sealing ring 8 is lower than the pressure in the first gas chamber 32. After the control console detects that P1 is less than P2, it sends an opening command to the solenoid valve 21 through the connecting line. The solenoid valve 21 opens the switch port 24, allowing high-pressure gas to enter the receiving groove 11 inside the sealing ring 8 through the air inlet 2, the air passage 30 and the air outlet 3, which quickly increases the pressure inside the sealing ring 8 and enhances the tightness of the seal between the sealing ring 8 and the inner wall of the cylinder 25.

[0057] During the process of high-pressure gas entering the sealing ring 8, the first pressure sensor 28 continuously detects the pressure value P1 and transmits the real-time data to the control console. The control console continuously compares P1 with the preset pressure threshold of the strong sealing mode. When P1 reaches the preset 0.8MPa of the strong sealing mode, the control console immediately sends a closing command to the solenoid valve 21. The solenoid valve 21 closes the switch port 24, stopping the continued entry of high-pressure gas. At this time, the sealing ring 8 maintains a high pressure of 0.8MPa, which can adapt to the high-intensity working state of the connecting rod 31 and resist the high pressure of the first air chamber 32, preventing gas leakage and ensuring stable operation of the actuator in the strong sealing mode. Through dynamic pressure regulation, the sealing strength can be automatically adjusted according to changes in working conditions, realizing adaptive optimization of sealing performance, ensuring sealing effect, avoiding unnecessary energy consumption, and improving the intelligence level and environmental adaptability of the pneumatic actuator.

[0058] Please see Figure 1 , Figure 2 , Figure 7 , Figure 8 and Figure 11An embodiment of the present invention provides: an intelligent self-compensating sealed piston pneumatic actuator, wherein a second pressure sensor 29 is provided at the top of the outer wall of the sealing cover 20, a first pressure sensor 28 is provided at the top of the outer wall of the sliding piston 1, the first pressure sensor 28, the second pressure sensor 29 and the solenoid valve 21 are connected to an external control console through an external connecting line, a first delivery pipe 26 and a second delivery pipe 27 are provided on the side of the outer wall of the cylinder 25, the first delivery pipe 26 passes through the cylinder 25 and is connected to the first air chamber 32, the second delivery pipe 27 passes through the cylinder 25 and is connected to the second air chamber 33, the first delivery pipe 26 and the second delivery pipe 27 are respectively connected to an external air pump, and a connecting rod 31 is provided at the bottom of the outer wall of the sliding piston 1;

[0059] Furthermore, in actual production, the operating conditions need to be restored from the high-pressure, high-risk strong sealing mode to the standard sealing mode under normal pressure to avoid the sealing ring 8 being under high pressure for a long time and thus aging faster. After receiving the mode switching command, the control console collects the pressure data of the first pressure sensor 28 and the second pressure sensor 29 in real time.

[0060] During mode switching, the console continuously monitors the intake and exhaust status of the first delivery pipe 26 and the second delivery pipe 27. When the second delivery pipe 27 exhausts and the first delivery pipe 26 intakes, high-pressure gas enters the first air chamber 32, causing the pressure in the first air chamber 32 to rise. The sliding piston 1 moves towards the second air chamber 33. At this time, the console detects that the pressure value P1 of the first pressure sensor 28 is less than the pressure value P2 of the second pressure sensor 29. The pressure inside the sealing ring 8 is lower than the pressure in the first air chamber 32. The console does not open the switch port 24 controlled by the solenoid valve 21 to prevent high-pressure gas from entering the sealing ring 8, avoid excessive expansion due to excessive pressure inside the sealing ring 8, and extend the service life of the sealing ring 8.

[0061] When the second delivery pipe 27 is inlet and the first delivery pipe 26 is outlet, high-pressure gas enters the second gas chamber 33, causing the pressure in the second gas chamber 33 to rise. The sliding piston 1 moves towards the first gas chamber 32. At this time, the control console detects that the pressure value P1 of the first pressure sensor 28 is greater than the pressure value P2 of the second pressure sensor 29. The pressure inside the sealing ring 8 is higher than the pressure in the first gas chamber 32. In the current strong sealing mode, the pressure inside the sealing ring 8 is too high, which wastes energy and accelerates the aging of the sealing ring 8 material. After the control console detects that P1 is greater than P2, it sends an opening command to the solenoid valve 21. The solenoid valve 21 opens the switch port 24, allowing the high-pressure gas in the receiving groove 11 inside the sealing ring 8 to be discharged in reverse through the outlet 3, the vent 30 and the inlet 2, thereby reducing the pressure inside the sealing ring 8.

[0062] During the exhaust process, the first pressure sensor 28 continuously detects the pressure value P1 and transmits the real-time data to the control console. The control console continuously compares P1 with the pressure threshold preset in the standard sealing mode. When P1 drops to 0.3MPa preset in the standard sealing mode, the control console immediately sends a closing command to the solenoid valve 21. The solenoid valve 21 closes the switch port 24 and stops the exhaust. At this time, the pressure inside the sealing ring 8 is maintained at 0.3MPa, which not only meets the sealing requirements of the standard sealing mode, but also avoids energy consumption and excessive pressure on the sealing element, achieving the best balance between energy saving and sealing.

[0063] When the entire actuator needs to be shut down, the control panel first switches the external air pump to connect with the external atmospheric pressure, and then opens the first delivery pipe 26, the second delivery pipe 27 and the solenoid valve 21, so that the first air chamber 32, the second air chamber 33 and the receiving groove 11 inside the sealing ring 8 are all connected to the external atmospheric pressure. Under the action of the internal and external pressure difference, the high-pressure gas in the sealing ring 8 is gradually discharged, and the pressure value gradually decreases to the normal pressure state. At this time, the sealing ring 8 loses the support of the internal gas pressure, but the ring spring 12 still applies an outward supporting force to the sealing ring 8, so that the sealing ring 8 and the inner wall of the cylinder 25 maintain contact pressure, which plays the role of static sealing, preventing external impurities from entering the cylinder 25 when the machine is stopped, and providing a pre-seal for the next start-up, ensuring that the working pressure can be quickly established when starting. Through intelligent pressure regulation, the service life of the seal is extended, maintenance costs are reduced, and the overall performance and reliability of the pneumatic actuator are improved.

[0064] Working principle: During initial installation, the ring spring 12 applies a pre-tightening force to the sealing ring 8, so that the sealing ring 8 maintains initial contact with the inner wall of the cylinder 25, achieving static pre-sealing. During operation, the control console selects the standard or strong sealing mode according to the working conditions and opens the solenoid valve 21, allowing high-pressure gas to enter the receiving groove 11 of the sealing ring 8 through the air inlet 2, the air passage 30 and the air outlet 3. The air pressure inside the sealing ring 8 increases, expands outward and tightly adheres to the inner wall of the cylinder 25, forming a dynamic seal. The first pressure sensor 28 detects the internal pressure of the sealing ring 8 in real time. After reaching the preset threshold, the control console closes the solenoid valve 21 to maintain a constant sealing pressure.

[0065] At the same time, the first conveying pipe 26 and the second conveying pipe 27 alternately introduce and exhaust air, changing the pressure difference between the first air chamber 32 and the second air chamber 33, driving the sliding piston 1 to reciprocate, and outputting power through the connecting rod 31. During the movement of the sliding piston 1, the first guide ring 18 and the second guide ring 19 ensure that the sliding piston 1 is guided smoothly, and the sealing ring 8 isolates the first air chamber 32 and the second air chamber 33 to prevent leakage.

[0066] When the operating conditions change, the corresponding sealing mode also changes. The control console controls the solenoid valve 21 to charge and release air based on the real-time data of the first pressure sensor 28 and the second pressure sensor 29, dynamically adjusting the pressure inside the sealing ring 8 so that the pressure inside the sealing ring 8 always matches the preset pressure threshold of the sealing mode, realizing intelligent self-compensation of sealing strength and ensuring efficient and reliable operation of the device.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An intelligent self-compensating sealed piston pneumatic actuator, comprising a sliding piston (1), an air passage (30), and a sealing ring (8), characterized in that: The sliding piston (1) is located inside the cylinder (25). The top of the sliding piston (1) is connected to the sealing cover (20) through the annular groove (4). The opening (24) of the sealing cover (20) is connected to the solenoid valve (21). The air inlet (2) at the top of the sliding piston (1) is connected to the air outlet (3) through the air passage (30). The air outlet (3) is used to guide the high-pressure gas into the receiving groove (11) inside the sealing ring (8). The annular spring (12) inside the sealing ring (8) is in contact with the sealing groove (7) of the sliding piston (1). The sealing ring (8) is connected to the sliding piston (1) through the first side ring (9) and the second side ring (10). The sliding piston (1) is connected to the first guide ring (18) and the second guide ring (19) through the first guide groove (5) and the second guide groove (6). The first guide ring (18) and the second guide ring (19) are in contact with the cylinder (25).

2. The intelligent self-compensating sealed piston pneumatic actuator according to claim 1, characterized in that: The sliding piston (1) has an annular groove (4) at the top of its outer wall and a threaded groove (22) on the inner side of its inner wall. The threaded groove (22) meshes with the internal thread (23) of the sealing cover (20). The internal thread (23) is located on the inner side of the sealing cover (20). The sealing cover (20) has a circular opening (24) at the top of its outer wall and a solenoid valve (21) on the opening (24).

3. The intelligent self-compensating sealed piston pneumatic actuator according to claim 2, characterized in that: The top of the outer wall of the sliding piston (1) is provided with an air inlet (2), which is connected to the top of the ventilation channel (30). The ventilation channel (30) is located inside the sliding piston (1), and the bottom of the ventilation channel (30) is connected to the air outlet (3). The air outlet (3) is located on the inner side of the sealing groove (7), and the sealing groove (7) is located on the outer side of the sliding piston (1).

4. The intelligent self-compensating sealed piston pneumatic actuator according to claim 3, characterized in that: The sealing groove (7) is an annular groove. An annular spring (12) is provided in the middle of the inner wall of the sealing groove (7). The inner surface of the annular spring (12) is in contact with the inner wall of the sealing groove (7). The outer surface of the annular spring (12) is in contact with the inner wall of the receiving groove (11) of the sealing ring (8). The receiving groove (11) is provided on the side of the inner wall of the sealing ring (8).

5. The intelligent self-compensating sealed piston pneumatic actuator according to claim 4, characterized in that: The sealing ring (8) has a first side ring (9) and a second side ring (10) on both sides of its outer wall. The inner walls of the first side ring (9) and the second side ring (10) are in contact with the inner wall of the sealing groove (7). The outer wall of the first side ring (9) is in contact with the inner wall of the first pressing ring (13). The outer wall of the second side ring (10) is in contact with the inner wall of the second pressing ring (14).

6. The intelligent self-compensating sealed piston pneumatic actuator according to claim 5, characterized in that: The first clamping ring (13) and the second clamping ring (14) have the same size structure. The first clamping ring (13) is a circular ring with an opening. The opening of the first clamping ring (13) is provided with a first locking head (15) and a second locking head (16). The outer walls of the first locking head (15) and the second locking head (16) are provided with screw holes. The bolt (17) passes through the screw holes of the first locking head (15) and the second locking head (16) to fix the first clamping ring (13) to the outside of the first side ring (9). The bottom end of the bolt (17) is provided with a nut.

7. The intelligent self-compensating sealed piston pneumatic actuator according to claim 6, characterized in that: The outer wall side of the sliding piston (1) is provided with a first guide groove (5) and a second guide groove (6). The first guide groove (5) is located above the sealing groove (7), and the second guide groove (6) is located below the sealing groove (7). A first guide ring (18) is provided in the first guide groove (5), and a second guide ring (19) is provided in the second guide groove (6).

8. The intelligent self-compensating sealed piston pneumatic actuator according to claim 7, characterized in that: The outer surfaces of the first guide ring (18) and the second guide ring (19) are in contact with the inner wall of the cylinder (25). A sliding piston (1) is provided inside the cylinder (25). The sliding piston (1) is in close contact with the inner wall of the cylinder (25) through the sealing ring (8). The sliding piston (1) divides the inside of the cylinder (25) into a first air chamber (32) and a second air chamber (33). The gas in the first air chamber (32) is in contact with the sealing cover (20).

9. The intelligent self-compensating sealed piston pneumatic actuator according to claim 8, characterized in that: The top of the outer wall of the sealing cover (20) is provided with a second pressure sensor (29), which is used to detect the air pressure value in the first air chamber (32). The top of the outer wall of the sliding piston (1) is provided with a first pressure sensor (28), which is used to detect the pressure value in the sealing ring (8). The first pressure sensor (28), the second pressure sensor (29) and the solenoid valve (21) are connected to the external control console through the connecting line on the outside.

10. The intelligent self-compensating sealed piston pneumatic actuator according to claim 9, characterized in that: The cylinder (25) has a first delivery pipe (26) and a second delivery pipe (27) on its outer side. The first delivery pipe (26) passes through the cylinder (25) and is connected to the first air chamber (32). The second delivery pipe (27) passes through the cylinder (25) and is connected to the second air chamber (33). The first delivery pipe (26) and the second delivery pipe (27) are respectively connected to an external air pump. The bottom of the outer wall of the sliding piston (1) is provided with a connecting rod (31).

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