Hydraulic drive compressor high-pressure air cylinder beneficial to heat dissipation

Abstract

The utility model relates to the technical field of hydraulic compressors, in particular to a hydraulic compressor high-pressure air cylinder beneficial to heat dissipation. The cylinder barrel comprises an inner-layer thin-wall cylinder barrel and an outer-layer thin-wall cylinder barrel, the inner-layer thin-wall cylinder barrel and the outer-layer thin-wall cylinder barrel are connected in an interference fit mode, a guide ring and a plurality of piston spring seals are arranged between the air piston and the inner-layer thin-wall cylinder barrel, openings of the piston spring seals face the high-pressure side, and an end cover spring seal is arranged between the front end cover and the inner-layer thin-wall cylinder barrel. An opening of the end cover spring seal faces one side of the air piston, a plurality of annular flow guide plates are arranged in the water jacket and located between the water jacket and the outer-layer thin-wall cylinder barrel to form a partition, water passing holes are formed in the flow guide plates, and the water passing holes of the adjacent flow guide plates are arranged in an up-down staggered mode. The stress generated by the interference fit not only can improve the capability of resisting external force, but also is beneficial to heat dissipation, so that heat can be conducted away by cooling water on the periphery of the cylinder barrel as soon as possible, the indicating work in the compression process is reduced, and the radial size of the whole air cylinder can be saved.

Description

Technical fields:

[0001] This utility model relates to the field of liquid-driven compressor technology, and in particular to a high-pressure cylinder for a liquid-driven compressor that facilitates heat dissipation. Background technology:

[0002] Currently, liquid-driven compressors are generally composed of a cylinder, a connecting cylinder, and a hydraulic cylinder. The hydraulic cylinder contains an oil piston, and the cylinder contains a gas piston. The oil piston and the gas piston are connected by a piston rod. When the oil piston reciprocates, it drives the gas piston to reciprocate through the piston rod, thereby pressurizing the gas. Current cylinders generally employ a traditional single-layer structure design. When the discharge pressure of a hydraulically driven compressor is high, such as above 200 MPa, even cylinders made from 17-4PH forgings with a yield strength as high as 1180 MPa will have a wall thickness of over 40 mm. Due to the size effect of forgings, the larger the cross-sectional area of ​​the forging, the lower its mechanical properties, and this also increases the radial dimension of the cylinder. In addition, the cylinder is surrounded by a water jacket, and the thicker the cylinder wall, the more detrimental it is to heat dissipation. The adiabatic temperature of a high-pressure cylinder during discharge exceeds 180°C. If the compressed medium is hydrogen, there is a risk of hydrogen embrittlement. Even when compressing ordinary gases, excessively high discharge temperatures will seriously affect the lifespan of the seals. Furthermore, current water jackets do not have internal guide plates, which can easily create dead zones in the cooling water, resulting in unsatisfactory cooling effects. There is currently no good solution to these problems.

[0003] In summary, the aforementioned problems in the cylinders of liquid-driven compressors have become urgent technical challenges that need to be addressed in the industry. Utility model content:

[0004] To overcome the shortcomings of the prior art, this utility model provides a high-pressure cylinder for a liquid-driven compressor that facilitates heat dissipation. It solves the problem that excessive cylinder wall thickness hinders heat dissipation and the problem that dead zones of cooling water easily form inside the water jacket of the previous cylinder, resulting in unsatisfactory cooling effect.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A high-pressure cylinder for a liquid-driven compressor with heat dissipation features a cylinder barrel with a rear end cover and a front end cover at both ends. The front end cover contains an air inlet and an exhaust outlet. A piston is located inside the cylinder barrel and connected to a piston rod. A water jacket is located outside the cylinder barrel, with an inlet and an outlet. The cylinder barrel comprises an inner thin-walled cylinder barrel and an outer thin-walled cylinder barrel, connected by an interference fit. A guide ring and several piston plug seals are located between the piston and the inner thin-walled cylinder barrel, with the openings of the piston plug seals facing the high-pressure side. An end cap plug seal is located between the front end cover and the inner thin-walled cylinder barrel, with the openings of the end cap plug seals facing the piston side. Several guide plates are located inside the water jacket, forming a ring between the water jacket and the outer thin-walled cylinder barrel to create a partition. Water passage holes are provided on the guide plates, with the water passage holes of adjacent guide plates staggered vertically.

[0007] The sum of the wall thicknesses of the inner thin-walled cylinder and the outer thin-walled cylinder is less than 30 mm.

[0008] Both the inner and outer thin-walled cylinder barrels are made of 17-4PH stainless steel.

[0009] The inner thin-walled cylinder barrel is made of 17-4PH stainless steel, and the outer thin-walled cylinder barrel is made of copper alloy.

[0010] An O-ring is provided between the outer thin-walled cylinder and the rear end cover for sealing.

[0011] An O-ring is provided between the inner thin-walled cylinder and the front end cover for sealing.

[0012] The present invention adopts the above solution and has the following advantages:

[0013] By dividing the cylinder into an inner thin-walled cylinder and an outer thin-walled cylinder, and connecting the inner and outer thin-walled cylinders with an interference fit, the stress generated by the interference fit not only improves the ability to resist external forces, ensuring at least a safety factor of 3 times when subjected to internal pressures of over 200MPa, but also facilitates heat dissipation, allowing heat to be quickly conducted away by the cooling water around the cylinder, thereby reducing the indicated work during the compression process and saving the radial dimension of the entire cylinder. By setting several guide plates in the water jacket, the cooling water can undergo multiple deflections within the water chamber, thereby minimizing the dead zone of the cooling water, increasing the heat exchange area, and ensuring that the cylinder is fully cooled during the compression of gas, thus extending the service life of the seals. Attached image description:

[0014] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0015] Figure 2 This is a cross-sectional view of the first and second thin-walled cylinders of this utility model.

[0016] Figure 3 This is a cross-sectional view of the water jacket of this utility model.

[0017] In the diagram, 1. Inner thin-walled cylinder barrel, 2. Outer thin-walled cylinder barrel, 3. Rear end cover, 4. Front end cover, 5. Air inlet, 6. Exhaust outlet, 7. Piston, 8. Piston rod, 9. Water jacket, 10. Water inlet, 11. Water outlet, 12. Guide ring, 13. Piston plug seal, 14. End cover plug seal, 15. Baffle plate, 16. Water passage hole, 17. O-ring. Detailed implementation method:

[0018] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0019] like Figure 1-3 As shown, a high-pressure cylinder for a liquid-driven compressor with heat dissipation features a cylinder barrel. The cylinder barrel has a rear end cover and a front end cover 4 at both ends. The front end cover 4 has an air inlet and an exhaust outlet 6. A piston 7 is located inside the cylinder barrel and connected to a piston rod 8. A water jacket 9 is located outside the cylinder barrel, with an inlet 10 and an outlet 11. The cylinder barrel includes an inner thin-walled cylinder barrel 1 and an outer thin-walled cylinder barrel 2, connected by an interference fit. The allowable stress of the double-walled cylinder barrel is at least twice that of a conventional cylinder barrel of the same thickness. The piston 7 and the inner thin-walled cylinder barrel 2... A guide ring 12 and several piston plug seals 13 are provided between the thin-walled cylinder barrels 1. The opening of the piston plug seal 13 faces the high-pressure side. An end cap plug seal 14 is provided between the front end cover 4 and the inner thin-walled cylinder barrel 1. The opening of the end cap plug seal 14 faces the side of the gas piston 7. This can withstand greater gas pressure and prevent the internal high-pressure gas from leaking outward. Several guide plates 15 are provided inside the water jacket 9. The guide plates 15 are arranged in a ring between the water jacket 9 and the outer thin-walled cylinder barrel 2 to form a partition. Water passage holes 16 are provided on the guide plates 15. The water passage holes 16 of adjacent guide plates 15 are arranged alternately.

[0020] The sum of the wall thicknesses of the inner thin-walled cylinder 1 and the outer thin-walled cylinder 2 is less than 30mm, which not only maintains high strength but also facilitates heat dissipation and saves radial space in the cylinder.

[0021] Both the inner thin-walled cylinder 1 and the outer thin-walled cylinder 2 are made of 17-4PH stainless steel, which has higher strength and improved heat dissipation.

[0022] The inner thin-walled cylinder 1 is made of 17-4PH stainless steel to ensure the strength of the inner layer, while the outer thin-walled cylinder 2 is made of copper alloy. Copper alloy has better thermal conductivity and is more conducive to heat dissipation.

[0023] An O-ring 17 is provided between the outer thin-walled cylinder 2 and the rear end cover 3 for sealing, which can prevent internal gas from leaking out.

[0024] An O-ring 17 is provided between the inner thin-walled cylinder 1 and the front end cover 4 for sealing, which can prevent internal gas from leaking out.

[0025] Working principle:

[0026] The piston rod 8 drives the piston 7 to reciprocate within the inner thin-walled cylinder 1. Gas enters the cylinder from the inlet 5 and exits from the outlet 6, thus pressurizing the gas. This pressurization process generates heat. Since steel has poor thermal conductivity, thicker walls are less conducive to heat dissipation. Therefore, a combination structure of inner thin-walled cylinder 1 and outer thin-walled cylinder 2 is adopted, using an interference fit connection. The stress generated by the interference fit not only improves the resistance to external forces, ensuring at least a safety factor of 3 times when subjected to internal pressures above 200MPa, but also, due to the reduced wall thickness, facilitates heat dissipation, allowing heat to be quickly conducted away by the cooling water around the cylinder. It also saves on the radial dimension of the entire cylinder. By providing several guide plates 16 inside the water jacket 9, the cooling water enters the water jacket 9 from the inlet 10 and undergoes multiple deflections within the water cavity, thereby minimizing the dead zone of the cooling water, increasing the heat exchange area, and finally exiting from the outlet 11. This ensures that the cylinder is fully cooled during the gas compression process, thereby extending the service life of the seals.

[0027] The above specific embodiments should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, any alternative improvements or modifications made to the embodiments of this utility model shall fall within the scope of protection of this utility model.

[0028] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A high-pressure cylinder for a liquid-driven compressor with heat dissipation, comprising a cylinder barrel, a rear end cover and a front end cover at both ends of the cylinder barrel, an air inlet and an air outlet inside the front end cover, a piston inside the cylinder barrel connected to a piston rod, and a water jacket outside the cylinder barrel, the water jacket having an inlet and an outlet, characterized in that: The cylinder includes an inner thin-walled cylinder and an outer thin-walled cylinder, which are connected by an interference fit. A guide ring and several piston plug seals are provided between the piston and the inner thin-walled cylinder, with the opening of the piston plug seal facing the high-pressure side. An end cap plug seal is provided between the front end cap and the inner thin-walled cylinder, with the opening of the end cap plug seal facing the piston side. Several guide plates are provided inside the water jacket. The guide plates are arranged in a ring between the water jacket and the outer thin-walled cylinder to form a partition. Water passage holes are provided on the guide plates, and the water passage holes of adjacent guide plates are staggered vertically.

2. The high-pressure cylinder of a liquid-driven compressor with heat dissipation as described in claim 1, characterized in that: The sum of the wall thicknesses of the inner thin-walled cylinder and the outer thin-walled cylinder is less than 30 mm.

3. The high-pressure cylinder of a liquid-driven compressor with heat dissipation as described in claim 1, characterized in that: Both the inner and outer thin-walled cylinder barrels are made of 17-4PH stainless steel.

4. The high-pressure cylinder of a liquid-driven compressor with heat dissipation as described in claim 1, characterized in that: The inner thin-walled cylinder barrel is made of 17-4PH stainless steel, and the outer thin-walled cylinder barrel is made of copper alloy.

5. A high-pressure cylinder for a liquid-driven compressor with heat dissipation as described in claim 1, characterized in that: An O-ring is provided between the outer thin-walled cylinder and the rear end cover for sealing.

6. The high-pressure cylinder of a liquid-driven compressor with heat dissipation as described in claim 1, characterized in that: An O-ring is provided between the inner thin-walled cylinder and the front end cover for sealing.

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