Oil-gas separation structure of hydraulic drive compressor

Abstract

The oil-gas separation structure comprises an end cover which is fixedly arranged between an oil cavity and a gas cavity, an axial through hole is formed in the middle of the end cover, and a piston rod is in sliding connection with the axial through hole in a matched mode; the two groups of sealing assemblies are fixed on the axial through hole and are in sliding connection with the piston rod; the gas side isolation cavity and the oil side isolation cavity are arranged between the two sets of sealing assemblies at intervals, and the two isolation cavities are formed in the top face and the bottom face of the end cover correspondingly and communicate with the axial through hole; the gas side leakage monitoring device is used for monitoring leaked gas pressure; the oil side leakage monitoring device is used for monitoring the amount of leaked hydraulic oil; and the adsorption ring is arranged between the gas side isolation cavity and the oil side isolation cavity. The isolation cavity and the end cover are integrally designed, so that the overall length of the hydraulic drive compressor is effectively shortened, the overall layout of the compressor skid is facilitated, meanwhile, the function of independently monitoring the sealing states of the oil side and the gas side is achieved, and the accuracy and the reliability of a leakage state judgment result are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of compressor technology. More specifically, this invention relates to an oil-gas separation structure for a liquid-driven compressor. Background Technology

[0002] As an important booster device widely used in hydrogen energy storage and transportation, natural gas extraction, military industry, aerospace and other fields, the liquid-driven compressor has high requirements for the integration of the liquid-driven compressor skid during installation, while ensuring the full functionality. Therefore, there are also strict requirements for the structure, size and spatial layout of the compressor body.

[0003] Current hydraulic compressors generally employ an isolation chamber between the hydraulic cylinder and the pneumatic cylinder to prevent hydraulic oil from entering the pneumatic cylinder during operation and to prevent gas from leaking into the hydraulic cylinder. Traditionally, this isolation chamber is independently located between the hydraulic cylinder end cap and the pneumatic cylinder end cap, resulting in an excessively long overall axial dimension of the hydraulic compressor, which is unfavorable for skid-mounted three-dimensional layouts. Furthermore, when monitoring compressor leaks, the leaking gas and hydraulic oil mix within the isolation chamber, typically only detecting the mixture's state. This makes it difficult to identify specific leaks on the oil and gas sides, resulting in insufficient accuracy in real-time leak assessment and difficulty in quickly pinpointing the exact location and cause of the leak, thus impacting maintenance efficiency.

[0004] To solve the above problems, it is necessary to design an oil-gas separation structure for a liquid-driven compressor, which is beneficial for controlling the overall axial dimension of the liquid-driven compressor and at the same time enabling accurate monitoring of compressor leakage. Summary of the Invention

[0005] The purpose of this invention is to provide an oil-gas separation structure for a liquid-driven compressor. The isolation chamber and end cover are designed as an integral unit, which effectively shortens the overall length of the liquid-driven compressor and facilitates the overall layout of the compressor skid. At the same time, it realizes the independent monitoring function of the sealing status of the oil side and the gas side, ensuring the accuracy and reliability of the leakage status judgment results.

[0006] To achieve these objectives and other advantages according to the present invention, a liquid-driven compressor oil-gas separation structure is provided, comprising: An end cap is fixed between the oil chamber and the gas chamber of the liquid-driven compressor. The end cap has an axial through hole in the middle. The piston rod of the liquid-driven compressor is slidably connected to the axial through hole and its two ends extend into the oil chamber and the gas chamber, respectively. Two sets of sealing assemblies are axially spaced along the axial through hole. Each set of sealing assemblies is fixed on the inner wall of the axial through hole and slidably connected to the piston rod. The sealing assembly is configured to seal the inner cavity of an adjacent liquid-driven compressor. A gas-side isolation cavity is disposed between the two sets of sealing assemblies. The gas-side isolation cavity is opened on the top surface of the end cap and communicates radially with the axial through hole. A gas-side leakage monitoring device, which is connected to the top opening of the gas-side isolation chamber and is used to monitor the pressure of the leaking gas; An oil-side isolation chamber is disposed between the gas-side isolation chamber and a set of sealing components adjacent to the oil chamber. The oil-side isolation chamber is opened on the bottom surface of the end cap and communicates radially with the axial through hole. An oil-side leakage monitoring device is connected to the bottom opening of the oil-side isolation chamber and is used to monitor the amount of leaked hydraulic oil. An adsorption ring is disposed between the gas-side isolation chamber and the oil-side isolation chamber. The adsorption ring is fixedly embedded in the inner wall of the axial through hole and slidably connected to the piston rod. The adsorption ring is configured to adsorb hydraulic oil.

[0007] Preferably, in the oil-gas separation structure of the liquid-driven compressor, a set of sealing components adjacent to the gas chamber is designated as a gas-side sealing component, which includes a gas-side sealing ring and a gas-side guide ring axially spaced along the axial through hole. Both the gas-side sealing ring and the gas-side guide ring are fixedly embedded in the inner wall of the axial through hole.

[0008] Preferably, in the oil-gas separation structure of the liquid-driven compressor, a set of sealing components adjacent to the oil chamber is designated as an oil-side sealing component, which includes an oil-side sealing ring, an oil-side guide ring, and an oil scraper ring arranged axially at intervals along the axial through hole. The oil-side sealing ring, the oil-side guide ring, and the oil scraper ring are all fixedly embedded in the inner wall of the axial through hole.

[0009] Preferably, in the oil-gas separation structure of the liquid-driven compressor, the oil-side sealing ring includes a main sealing ring and a secondary sealing ring. The secondary sealing ring, the oil scraper ring, the main sealing ring, and the oil-side guide ring are arranged sequentially from the gas chamber side to the oil chamber side along the axial direction of the axial through hole. A main sealing detection channel is provided between the oil scraper ring and the main sealing ring. The main sealing detection channel is opened on the bottom surface of the end cover and communicates with the axial through hole radially. The bottom opening of the main sealing detection channel is connected to the oil-side leakage monitoring device.

[0010] Preferably, in the oil-gas separation structure of the liquid-driven compressor, the gas-side isolation chamber, the oil-side isolation chamber, and the main seal detection channel are all arranged in a vertical direction.

[0011] Preferably, the hydraulic compressor oil-gas separation structure further includes two flow meters, which are respectively configured to monitor the hydraulic oil flow at the bottom opening of the main seal detection channel and the bottom opening of the oil-side isolation chamber.

[0012] Preferably, in the liquid-driven compressor oil-gas separation structure, the gas-side leakage monitoring device includes a gas pipeline that is connected to the top opening of the gas-side isolation chamber; and a pressure sensor that is disposed on the gas pipeline and used to detect its internal pressure.

[0013] Preferably, in the hydraulic compressor oil-gas separation structure, the oil-side leakage monitoring device includes a hydraulic oil pipeline, one end of which is connected to the bottom opening of the oil-side isolation chamber; an oil collection box, which is connected to the other end of the hydraulic oil pipeline; and a liquid level sensor, which is configured to detect changes in the oil level in the oil collection box.

[0014] Preferably, in the oil-gas separation structure of the liquid-driven compressor, the adsorption ring is filled with a porous polymer.

[0015] The present invention has at least the following beneficial effects: The isolation chamber and oil-side and gas-side end caps of this invention adopt an integrated, one-piece design, which effectively shortens the overall length of the liquid-driven compressor, reduces the assembly difficulty of the compressor, facilitates the overall layout of the compressor skid, and realizes independent monitoring functions for the oil-side and gas-side sealing status. This ensures the accuracy and reliability of the leakage status judgment results, can promptly detect compressor air / oil leakage problems, and quickly locate the leakage direction and determine the leakage cause (oil-side seal failure, gas-side seal failure) when leakage problems occur. This enables rapid inspection and timely maintenance of the compressor, which is conducive to ensuring the working stability and safety of the compressor.

[0016] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an oil-gas separation structure for a liquid-driven compressor according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a partial structure at point A in the above embodiment.

[0018] Explanation of reference numerals in the attached figures: 1. Cylinder; 2. End cap; 3. Oil-side piston; 4. Oil cylinder; 5. Piston guide band; 6. Piston seal; 7. Gas-side end cap sealing ring; 8. Gas-side guide ring; 9. Gas-side sealing ring; 10. Adsorption ring; 11. Secondary sealing ring; 12. Oil scraper ring; 13. Main sealing ring; 14. Oil-side guide ring; 15. Oil-side end cap sealing ring; 16. Oil collection box; 17. Pressure sensor; 101. Air inlet; 102. Gas-side isolation chamber; 103. Oil inlet; 104. Main seal detection channel; 105. Oil-side isolation chamber; 106. Exhaust port. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0020] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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.

[0021] like Figure 1-2 As shown, the present invention provides an oil-gas separation structure for a liquid-driven compressor, comprising: End cap 2 is fixed between the oil chamber and the gas chamber of the liquid-driven compressor. The end cap 2 has an axial through hole in the middle. The piston rod of the liquid-driven compressor is slidably connected to the axial through hole and its two ends extend into the oil chamber and the gas chamber respectively. Two sets of sealing assemblies are axially spaced along the axial through hole. Each set of sealing assemblies is fixed to the inner wall of the axial through hole and slidably connected to the piston rod. The sealing assemblies are configured to seal the inner cavity of an adjacent liquid-driven compressor. Here, the inner cavity of the liquid-driven compressor refers to the oil cavity or the gas cavity. That is, the sealing assembly adjacent to the oil cavity seals the oil cavity by closing the gap between the piston rod and the axial through hole, and the sealing assembly adjacent to the gas cavity seals the gas cavity by closing the gap between the piston rod and the axial through hole. A gas-side isolation cavity 102 is disposed between the two sets of sealing assemblies. The gas-side isolation cavity 102 is opened on the top surface of the end cap 2 and communicates radially with the axial through hole. A gas-side leakage monitoring device, which is connected to the top opening of the gas-side isolation chamber 102 and is used to monitor the pressure of the leaking gas; An oil-side isolation chamber 105 is disposed between the gas-side isolation chamber 102 and a set of sealing components adjacent to the oil chamber. The oil-side isolation chamber 105 is opened on the bottom surface of the end cap 2 and communicates radially with the axial through hole. An oil-side leakage monitoring device is connected to the bottom opening of the oil-side isolation chamber 105 and is used to monitor the amount of leaked hydraulic oil. An adsorption ring 10 is disposed between the gas-side isolation chamber and the oil-side isolation chamber. The adsorption ring is fixedly embedded in the inner wall of the axial through hole and slidably connected to the piston rod. The adsorption ring is configured to adsorb hydraulic oil.

[0022] In the above technical solution, the hydraulic compressor integrates an oil cylinder 4 and an air cylinder 1. The oil chamber is correspondingly located inside the oil cylinder, and the air chamber is correspondingly located inside the air cylinder. The piston rod passes through the end cover 2 between the oil cylinder and the air cylinder and is slidably connected to the oil chamber (oil cylinder) and the air chamber (air cylinder) respectively through the oil-side piston 3 and the air-side piston. Both the oil-side piston and the air-side piston are equipped with piston guide bands 5 and piston seals 6. Thus, by introducing hydraulic oil into the oil cylinder, the oil-side piston can be driven to move the piston rod axially, thereby driving the air-side piston to move within the air cylinder to achieve the gas compression function. The oil-gas separation structure of this invention is located between the air cylinder and the oil cylinder of the hydraulic compressor, integrating the original air cylinder end cover and oil cylinder end cover into one unit, and integrating the isolation chamber into the end cover. On the one hand, it can prevent hydraulic oil in the oil cylinder from leaking into the air cylinder and contaminating the compressed gas, and on the other hand, it can effectively shorten the axial dimension of the compressor. Based on the characteristics of gas rising and liquid sinking, the isolation chamber adopts a split design with upper and lower parts. Specifically, an air inlet (the top opening of the air-side isolation chamber) is located directly above the end cap, and an oil inlet (the bottom opening of the oil-side isolation chamber) is located directly below the end cap. The air-side and oil-side isolation chambers are offset along the end cap axis. Adsorption rings are added to both isolation chambers. These adsorption rings are made of oleophilic and hydrophobic polymer materials (such as polyurethane foam or syndiotactic polystyrene aerogel) to effectively adsorb hydraulic oil leaking through the axial through-hole and residual oil film on the piston rod, preventing oil and gas mixing and contamination of adjacent chambers. The two ends of the end cap have a T-shaped structure that fits inside the air and oil chambers, respectively. Correspondingly, the two ends of the end cap are equipped with an air-side end cap sealing ring 7 and an oil-side end cap sealing ring 15 to seal the fitting (adhesive) surfaces between the end cap and the air and oil chambers.

[0023] When the hydraulic compressor operates, hydraulic oil is injected through the oil inlet of the oil chamber, pushing the oil-side piston and causing the piston rod to reciprocate. Compressed gas enters the gas chamber through the air inlet, is compressed, and is discharged from the exhaust port. A small amount of hydraulic oil adheres to the piston rod in the cylinder. After passing through the sealing components (which return to the oil chamber due to sealing) and the oil-side isolation chamber (which flows downward due to gravity), the remaining hydraulic oil film is completely adsorbed by the adsorption ring, effectively preventing the possibility of hydraulic oil contaminating the compressed gas and ensuring the purity of the compressed gas. At the same time, the adsorption ring can also work in conjunction with the two sets of sealing components to form a multi-layer sealing structure, playing a role in bidirectional isolation of gas and oil leakage. The air inlet, exhaust port, oil inlet, and oil outlet (of the oil chamber) can be set on the cylinder and oil cylinder according to the actual layout of the compressor. The integration of the end cover and the isolation chamber does not affect the structural design of the oil cylinder and cylinder body. If the air inlet, exhaust port, and oil inlet of the hydraulic compressor's gas chamber are all set on the end cover, such as... Figure 1 As shown, the air inlet 101, exhaust outlet 106, and oil inlet 103 on the end cap 2 all need to be connected to the air chamber / oil chamber through the internal channel of the end cap. To avoid interference with the isolation chamber, the internal channel needs to be located on the outside of each isolation chamber and each sealing component, closer to the air chamber / oil chamber. In this embodiment, auxiliary holes are respectively opened at both ends of the axial through hole. The diameter of the auxiliary holes is slightly larger than that of the axial through hole and is opened coaxially with it in the middle of the end cap. The outer end face of each auxiliary hole is directly connected to the adjacent inner cavity (air chamber / oil chamber). Thus, the air inlet, exhaust outlet, and oil inlet can be set on the outer wall of the end cap and connected to the corresponding auxiliary holes through the radial channel inside the end cap (in actual applications, the arrangement is not limited to the one shown in the figure).

[0024] In addition, the gas-side leakage monitoring device is installed at the gas port of the isolation chamber, and the oil-side leakage monitoring device is installed at the oil port of the isolation chamber. When the oil-side seal fails, hydraulic oil flows out from the oil-side isolation chamber and can be detected by the oil-side leakage monitoring device; when the gas-side seal fails, high-pressure gas is discharged from the gas-side isolation chamber and can be detected by the gas-side leakage monitoring device. This realizes the independent monitoring function of the oil-side and gas-side sealing status, ensuring the accuracy and reliability of the leakage status judgment results. It can promptly detect compressor gas / oil leakage problems, and quickly locate the leakage direction and determine the leakage cause (oil-side seal failure, gas-side seal failure) when leakage problems occur. This allows for rapid inspection and timely maintenance of the compressor, which is conducive to ensuring the operating stability and safety of the compressor. Both the gas-side leakage monitoring device and the oil-side leakage monitoring device are electrically connected to the compressor's controller. The controller can receive monitoring data from each leakage detection device and automatically determine the current leakage status based on the set monitoring threshold to achieve a seal failure alarm function. The alarm information can be accurate to the specific leakage direction and cause (gas-side seal failure, oil-side seal failure). While issuing the alarm signal, the controller can also automatically control the compressor to stop to avoid the problem of untimely manual operation by the staff and ensure construction safety.

[0025] This invention primarily addresses the problems of excessively large axial dimensions and difficulty in detecting oil-gas separation in traditional oil-gas isolation chambers. It adopts an integrated, one-piece design for the isolation chamber and the oil-side and gas-side end caps, effectively shortening the overall length of the liquid-driven compressor, reducing assembly difficulty, and facilitating the overall layout of the compressor skid. Simultaneously, it enables independent monitoring of the sealing status of the oil-side and gas-side. This invention effectively avoids the possibility of oil contamination of the gas and can be widely applied to various operating conditions, including those requiring high purity of compressed gas, such as compressed hydrogen (gas purity ≥ 99.99%).

[0026] In another technical solution, the oil-gas separation structure of the liquid-driven compressor is configured with a set of sealing components adjacent to the gas chamber as a gas-side sealing component, which includes a gas-side sealing ring 9 and a gas-side guide ring 8 arranged axially at intervals along the axial through hole. The gas-side sealing ring and the gas-side guide ring are both fixedly embedded in the inner wall of the axial through hole.

[0027] Specifically, annular mounting grooves are correspondingly formed on the inner wall of the axial through hole to install the gas-side sealing ring 9 and the gas-side guide ring 8. After installation, the gas-side sealing ring and gas-side guide ring are respectively inserted into their corresponding annular mounting grooves and fixed, and are slidably connected coaxially with the piston rod. The gas-side sealing ring seals the gap between the piston rod and the axial through hole. The two gas-side guide rings 8 are respectively located on both sides of the gas-side sealing ring 9 to guide and support the piston rod, ensuring the straightness and stability of its movement trajectory. They also prevent direct contact and friction between the piston and piston rod and the cylinder block or end cover during movement, thereby protecting the cylinder block, piston, and piston rod. Both the gas-side sealing ring and the gas-side guide ring can be removed and replaced from the annular mounting grooves.

[0028] In another technical solution, the oil-gas separation structure of the liquid-driven compressor is configured with a set of sealing components adjacent to the oil chamber as an oil-side sealing component, which includes an oil-side sealing ring, an oil-side guide ring and an oil scraper ring arranged axially at intervals along the axial through hole. The oil-side sealing ring, the oil-side guide ring and the oil scraper ring are all fixedly embedded on the inner wall of the axial through hole.

[0029] Specifically, annular mounting grooves are correspondingly formed on the inner wall of the axial through hole to install the oil-side sealing ring, the oil-side guide ring, and the oil scraper ring. Once installed, the oil-side sealing ring, oil-side guide ring, and oil scraper ring are respectively inserted into their corresponding annular mounting grooves and fixed, and slidably connected coaxially with the piston rod. The oil-side sealing ring seals the gap between the piston rod and the axial through hole; the oil-side guide ring guides and supports the piston rod, ensuring the straightness and stability of its movement trajectory, and preventing direct contact and friction between the piston / piston rod and the cylinder body or end cover during movement, thus protecting the cylinder body, piston, and piston rod; the oil scraper ring grips the piston rod and scrapes hydraulic oil off the piston rod using a scraper blade on its inner circle, preventing hydraulic oil in the cylinder from leaking along the piston rod to the cylinder side. The oil-side sealing ring, oil-side guide ring, and oil scraper ring can all be removed and replaced from the annular mounting grooves. In one implementation, the oil-side sealing ring, the oil-side guide ring, and the oil scraper ring can be arranged sequentially from the air chamber side to the oil chamber side, so that the hydraulic oil passes through the oil scraper ring first and can flow back to the oil chamber along the axial through hole under the action of the oil scraper ring.

[0030] In another technical solution, the oil-gas separation structure of the liquid-driven compressor includes a main sealing ring 13 and a secondary sealing ring 11 on the oil side. The secondary sealing ring 11, the oil scraper ring 12, the main sealing ring 13, and the oil-side guide ring 14 are arranged sequentially from the gas chamber side to the oil chamber side along the axial direction of the axial through hole. A main sealing detection channel 104 is provided between the oil scraper ring 12 and the main sealing ring 13. The channel is opened on the bottom surface of the end cover 2 and communicates with the axial through hole radially. The bottom opening of the main sealing detection channel 104 is connected to the oil-side leakage monitoring device.

[0031] In the above technical solution, each component of the oil-side sealing assembly is installed in a specific position, forming a dual leakage detection structure together with the main sealing detection channel and the oil-side isolation chamber, and forming a multi-stage sealing structure together with the adsorption ring. Specifically, the oil-side guide ring 14 and the main sealing ring 13 are positioned closer to the oil chamber to guide the piston rod and provide primary sealing. When the seal at the main sealing ring 13 fails, hydraulic oil continues to diffuse from the main sealing ring 13 along the axial through-hole to the air side (left side in the figure), and flows out through the main sealing detection channel 104 to the oil-side leakage monitoring device under the action of the scraper ring 12. After detecting that the leakage amount reaches a set threshold, the oil-side leakage monitoring device sends a shutdown signal through the controller. Here, there is a time difference between the hydraulic oil leakage and the issuance of the shutdown signal, i.e. After a leak occurs, the oil-side piston 3 will still drive the piston rod to move a certain distance (time). Therefore, an additional secondary sealing ring 11 is set after the oil scraper ring 12 to achieve a secondary sealing effect. When the seal at the secondary sealing ring 11 also fails, the hydraulic oil continues to diffuse from the secondary sealing ring 11 along the axial through hole to the air side (left side in the figure), and under the action of gravity, it naturally flows out along the oil-side isolation chamber 105 to the oil-side leakage monitoring device. The residual trace amount of hydraulic oil and the oil film attached to the piston rod can be fully absorbed by the adsorption ring 10 on the left side of the oil-side isolation chamber to achieve a tertiary sealing effect. The aforementioned dual leakage detection method is well-suited for multi-stage sealing structures. Once an oil-side leakage problem is identified, the leakage location (main sealing ring, auxiliary sealing ring) and severity can be accurately pinpointed by monitoring the oil flow rate in each leakage direction (main seal detection channel, oil-side isolation chamber). Simultaneously, it effectively prevents hydraulic oil in the cylinder from leaking along the piston rod to the cylinder side, further reducing the possibility of hydraulic oil contaminating the compressed gas in the air chamber. This ensures the compressor's operating quality and makes it better suited for operating conditions requiring high compressed gas purity.

[0032] In another technical solution, the oil-gas separation structure of the liquid-driven compressor, wherein the gas-side isolation chamber 102, the oil-side isolation chamber 105, and the main seal detection channel 104 are all arranged vertically. As the optimal implementation, the gas-side isolation chamber, the oil-side isolation chamber, and the main seal detection channel are all arranged radially and vertically along the axial through hole, and are staggered at intervals along the axial direction of the axial through hole, so that leaked gas and hydraulic oil can naturally converge at the openings of the corresponding chambers / channels, ensuring that leaked gas and hydraulic oil can be discharged in a timely, efficient, and non-interfering manner.

[0033] In another technical solution, the hydraulic compressor oil-gas separation structure further includes two flow meters (not shown in the figure), which are respectively configured to monitor the hydraulic oil flow at the bottom opening of the main seal detection channel and the bottom opening of the oil-side isolation chamber. The flow meters assist the oil-side leakage monitoring device in performing refined leakage detection. Both flow meters are electrically connected to the controller, and real-time flow signals are continuously fed back to the controller. When the amount of leaked oil detected by the oil-side leakage monitoring device reaches the alarm requirement (seal failure), the controller extracts historical data from the two flow meters to help determine the specific oil leakage situation in the main seal detection channel and the oil-side isolation chamber, and further determine whether only the main seal ring is leaking, or whether both the main and auxiliary seal rings are faulty. Specifically, the flow meters can be conventional liquid flow meters (such as thermal flow meters, ultrasonic flow meters, etc.), which are installed on external pipelines (i.e., the external pipelines where the oil-side leakage monitoring device is connected to the main seal detection channel and the oil-side isolation chamber, respectively) for installation and wiring (signal transmission).

[0034] In another technical solution, the oil-gas separation structure of the liquid-driven compressor includes a gas-side leakage monitoring device comprising a gas pipeline (one end of which is connected to the top opening of the gas-side isolation chamber) and a pressure sensor 17, which is installed on the gas pipeline and used to detect its internal pressure.

[0035] The pressure sensor is electrically connected to the controller, and the real-time pressure signal is continuously fed back to the controller. When there is no gas leakage, the pressure inside the gas pipeline is at atmospheric pressure, approximately 0.1 MPa. A pressure alarm threshold is set according to the compressor structure and sealing component parameters (e.g., a warning value of 0.2 MPa and an alarm value of 0.25 MPa). When a set of sealing components adjacent to the gas chamber (mainly the gas-side sealing ring 9) fails, the high-pressure gas in the cylinder flows out from the gas-side isolation chamber into the gas pipeline. Once the real-time gas pressure detected by the pressure sensor exceeds 0.25 MPa, the controller automatically sends an alarm signal indicating abnormal pressure and gas-side seal failure, and controls the compressor to automatically shut down. Specifically, the other end of the gas pipeline is connected to a gas treatment device (such as a filter or purifier). A control valve is also provided at the outer end of the gas pipeline, which can reasonably discharge or recover the high-pressure gas after monitoring is completed (leakage problem is detected and located).

[0036] In another technical solution, the oil-gas separation structure of the hydraulic compressor includes an oil-side leakage monitoring device comprising a hydraulic oil pipeline, one end of which is connected to the bottom opening of the oil-side isolation chamber; an oil collection box 16, which is connected to the other end of the hydraulic oil pipeline; and a liquid level sensor, which is configured to detect changes in the oil level in the oil collection box.

[0037] Specifically, the liquid level sensor is a tuning fork level switch. A pair of piezoelectric crystals mounted on the tuning fork base cause the tuning fork to vibrate at a certain resonant frequency. When the fork of the tuning fork switch comes into contact with the hydraulic oil in the oil collection box, the frequency and amplitude of the fork will change. The tuning fork level switch realizes the liquid level detection function by identifying the changes in the frequency and amplitude of the fork, and transmits the detection signal to the controller in real time for monitoring and alarming of oil leakage.

[0038] In this embodiment, a set of sealing components adjacent to the oil chamber is arranged in a sequence from left to right, consisting of a secondary sealing ring, an oil scraper ring, a main sealing ring, and an oil-side guide ring. A main sealing detection channel is provided between the oil scraper ring and the main sealing ring. The bottom opening of the main sealing detection channel is connected to the oil collection box through a detection pipe. Flow meters are installed on the hydraulic oil pipe and the detection pipe, respectively. When the main seal fails, hydraulic oil flows into the oil collection box from the main sealing detection channel. When both the main seal and the secondary seal fail, the hydraulic oil is collected in the oil collection box through the main sealing detection channel-detection pipe and the oil-side isolation chamber-hydraulic oil pipe, respectively. The leaked hydraulic oil drips onto the tuning fork of the tuning fork level switch. The tuning fork level switch transmits the level signal to the controller (PLC control system), which controls the equipment to stop according to the set control threshold and issues an alarm message on the operation interface of the station control system.

[0039] In another technical solution, the oil-gas separation structure of the liquid-driven compressor has a porous polymer filling the adsorption ring.

[0040] In the above technical solution, the adsorption ring is mainly made of porous polymer material to form a porous polymer adsorption structure. Its interior is filled with porous polymer materials (such as polyurethane foam, syndiotactic polystyrene aerogel, etc.). This material is oleophilic and hydrophobic, exhibiting a fast oil absorption rate and high oil absorption ratio, and is not prone to leakage after adsorption. The adsorption ring can be directly molded from porous polymer materials, or a ring sleeve can be installed on the outer ring surface of the annular porous polymer to ensure the stability and structural strength of the adsorption ring. This also facilitates the fitting and installation of the adsorption ring with the end cap (annular assembly groove on the inner wall of the axially penetrating hole). The inner ring surface of the annular porous polymer is directly attached to and slidably connected with the piston rod to ensure the adsorption effect.

[0041] In practical applications, the adsorption ring serves two main purposes. First, it acts as an auxiliary sealing structure, further isolating the oil-side and gas-side isolation chambers to prevent interference between leaking gas and leaking oil, thus avoiding inaccurate monitoring results. Second, even in the event of sealing component failure, the adsorption ring can adsorb leaked hydraulic oil or a small amount of hydraulic oil film adhering to the piston rod surface through its porous polymer. The polymer adsorption structure has a high oil absorption rate, enabling it to promptly absorb large amounts of leaked hydraulic oil. It can be used for extended periods, with a service life superior to conventional seals (consumable parts), effectively and reliably preventing hydraulic oil contamination of compressed gas, thereby ensuring the purity of the compressed gas. Maintenance of the adsorption ring can be carried out simultaneously with the inspection and repair of the sealing components. Furthermore, the porous polymer filling the adsorption ring can be reused after appropriate treatment (such as squeezing and cleaning), which helps control production and maintenance costs.

[0042] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. An oil-gas separation structure for a liquid-driven compressor, characterized in that, include: An end cap is fixed between the oil chamber and the gas chamber of the liquid-driven compressor. The end cap has an axial through hole in the middle. The piston rod of the liquid-driven compressor is slidably connected to the axial through hole and its two ends extend into the oil chamber and the gas chamber, respectively. Two sets of sealing assemblies are axially spaced along the axial through hole. Each set of sealing assemblies is fixed on the inner wall of the axial through hole and slidably connected to the piston rod. The sealing assembly is configured to seal the inner cavity of an adjacent liquid-driven compressor. A gas-side isolation cavity is disposed between the two sets of sealing assemblies. The gas-side isolation cavity is opened on the top surface of the end cap and communicates radially with the axial through hole. A gas-side leakage monitoring device, which is connected to the top opening of the gas-side isolation chamber and is used to monitor the pressure of the leaking gas; An oil-side isolation chamber is disposed between the gas-side isolation chamber and a set of sealing components adjacent to the oil chamber. The oil-side isolation chamber is opened on the bottom surface of the end cap and communicates radially with the axial through hole. An oil-side leakage monitoring device is connected to the bottom opening of the oil-side isolation chamber and is used to monitor the amount of leaked hydraulic oil. An adsorption ring is disposed between the gas-side isolation chamber and the oil-side isolation chamber. The adsorption ring is fixedly embedded in the inner wall of the axial through hole and slidably connected to the piston rod. The adsorption ring is configured to adsorb hydraulic oil.

2. The oil-gas separation structure of the liquid-driven compressor as described in claim 1, characterized in that, A set of sealing components adjacent to the air chamber is designated as an air-side sealing component, which includes an air-side sealing ring and an air-side guide ring arranged axially at intervals along the axial through hole. Both the air-side sealing ring and the air-side guide ring are fixedly embedded in the inner wall of the axial through hole.

3. The oil-gas separation structure of the liquid-driven compressor as described in claim 1, characterized in that, A set of sealing components adjacent to the oil cavity is designated as an oil-side sealing component, which includes an oil-side sealing ring, an oil-side guide ring, and an oil scraper ring arranged axially at intervals along the axial through hole. The oil-side sealing ring, the oil-side guide ring, and the oil scraper ring are all fixedly embedded in the inner wall of the axial through hole.

4. The oil-gas separation structure of the liquid-driven compressor as described in claim 3, characterized in that, The oil-side sealing ring includes a main sealing ring and a secondary sealing ring. The secondary sealing ring, the oil scraper ring, the main sealing ring, and the oil-side guide ring are arranged sequentially from the air chamber side to the oil chamber side along the axial direction of the axial through hole. A main sealing detection channel is provided between the oil scraper ring and the main sealing ring. The channel is opened on the bottom surface of the end cap and communicates with the axial through hole radially. The bottom opening of the main sealing detection channel is connected to the oil-side leakage monitoring device.

5. The oil-gas separation structure of the liquid-driven compressor as described in claim 4, characterized in that, The gas-side isolation chamber, the oil-side isolation chamber, and the main seal detection channel are all arranged in a vertical direction.

6. The oil-gas separation structure of the liquid-driven compressor as described in claim 4, characterized in that, It also includes two flow meters, which are respectively configured to monitor the hydraulic oil flow at the bottom opening of the main seal detection channel and the bottom opening of the oil-side isolation chamber.

7. The oil-gas separation structure of the liquid-driven compressor as described in claim 1, characterized in that, The gas-side leakage monitoring device includes a gas pipeline that is connected to the top opening of the gas-side isolation chamber; and a pressure sensor that is mounted on the gas pipeline and used to detect its internal pressure.

8. The oil-gas separation structure of the liquid-driven compressor as described in claim 1, characterized in that, The oil-side leakage monitoring device includes a hydraulic oil pipeline, one end of which is connected to the bottom opening of the oil-side isolation chamber; an oil collection box, which is connected to the other end of the hydraulic oil pipeline; and a level sensor, which is configured to detect changes in the oil level in the oil collection box.

9. The oil-gas separation structure of the liquid-driven compressor as described in claim 1, characterized in that, The adsorption ring is filled with a porous polymer.

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