A differential circulating liquid seal cylinder with a balance chamber

Abstract

This utility model relates to the field of circulating liquid seal compressor technology, and in particular to a differential circulating liquid seal cylinder with a balance chamber. A low-pressure circulating chamber is provided on the outer surface of the low-pressure piston, forming a low-pressure chamber within the cylinder body between the low-pressure piston end face and the cylinder base. A high-pressure circulating chamber is provided on the outer surface of the high-pressure piston, forming a high-pressure chamber between the cylinder body and the outer surface of the piston rod between the high-pressure piston end face and the cylinder head. A balance chamber is formed between the cylinder body and the outer surface of the connecting rod between the low-pressure and high-pressure pistons. The cylinder body sidewall has a balance inlet and a balance outlet connected to the balance chamber. The gas is first pressurized in the low-pressure chamber, and then the pressurized gas enters the high-pressure chamber for secondary pressurization via a pipeline. This differential pressurization of the compressed gas greatly improves compression efficiency. The gas pressure in the balance chamber balances the piston force generated in the low-pressure or high-pressure chamber, ensuring stable piston operation and guaranteeing the overall lifespan of the cylinder.

Description

Technical fields:

[0001] This utility model relates to the field of circulating liquid seal compressor technology, and in particular to a differential circulating liquid seal cylinder with a balance chamber. Background technology:

[0002] The circulating liquid seal compressor mainly uses a drive mechanism to drive the reciprocating motion of a piston within the cylinder to pressurize the gas. For example, patent application CN114439728A discloses a circulating liquid seal compressor that uses an annular cavity between the piston and the cylinder to store circulating liquid, which provides lubrication, cooling, and sealing. On one hand, this type of cylinder is a single-acting cylinder with one inlet and one outlet. Gas enters the cylinder through the inlet, is pressurized within the cylinder, and then discharged at high pressure through the outlet. This single-acting cylinder cannot perform stepped pressurization of the compressed gas, resulting in low compression efficiency. On the other hand, as the piston reciprocates and pressurizes the gas, the pressure within the compression chamber continuously increases, and the force on the piston also continuously increases. This can easily affect the stable operation of the piston, increase the friction between the piston and the cylinder, affect the overall lifespan of the cylinder, and also affect the seal between the piston and the cylinder. Currently, there is no good solution to these problems.

[0003] In summary, the issues of differential pressurization of compressed gas and large piston force in circulating liquid seal 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 differential circulating liquid seal cylinder with a balance chamber, which solves the problem of low compression efficiency of previous single-acting cylinders and the problem of large piston force affecting the overall life of the cylinder.

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

[0006] A differential circulating liquid seal cylinder with a balance chamber includes a cylinder body, a cylinder cover at one end of the cylinder body, a cylinder base at the other end of the cylinder body, and a piston structure inside the cylinder body. The piston structure includes a low-pressure piston, a high-pressure piston, and a connecting rod that connects the low-pressure piston and the high-pressure piston as a whole. The high-pressure piston is connected to the piston rod. The low-pressure piston, the connecting rod, and the high-pressure piston are movably installed inside the cylinder body, and the piston rod is movably installed inside the cylinder cover.

[0007] The outer surface of the low-pressure piston is provided with a low-pressure circulation chamber, which is used to store circulating fluid for cooling, lubrication and liquid sealing of the cylinder. The side wall of the cylinder is provided with a low-pressure inlet and a low-pressure outlet connected to the low-pressure circulation chamber. A low-pressure chamber is formed in the cylinder between the end face of the low-pressure piston and the cylinder base. The side wall of the cylinder is provided with a low-pressure inlet and a low-pressure outlet connected to the low-pressure chamber.

[0008] The outer surface of the high-pressure piston is provided with a high-pressure circulation chamber, which is used to store circulating fluid for cooling, lubrication and liquid sealing of the cylinder. The side wall of the cylinder is provided with a high-pressure inlet and a high-pressure outlet connected to the high-pressure circulation chamber. A high-pressure chamber is formed between the cylinder and the outer surface of the piston rod between the end face of the high-pressure piston and the cylinder head. The side wall of the cylinder is provided with a high-pressure air inlet and a high-pressure air outlet connected to the high-pressure chamber.

[0009] A balance chamber is formed between the cylinder body and the outer surface of the connecting rod between the low-pressure piston and the high-pressure piston. The balance chamber is used to balance the piston force. The side wall of the cylinder body is provided with a balance air inlet and a balance air outlet that are connected to the balance chamber.

[0010] The cylinder body is connected to the cylinder base and cylinder cover by bolts and sealed with sealing rings.

[0011] The low-pressure air inlet is equipped with a low-pressure air inlet valve, and the low-pressure air outlet is equipped with a low-pressure air outlet valve.

[0012] The high-pressure air inlet is equipped with a high-pressure air inlet valve, and the high-pressure air outlet is equipped with a high-pressure air outlet valve.

[0013] The volume of the high-pressure chamber is smaller than the volume of the low-pressure chamber.

[0014] The low-pressure outlet is connected to the high-pressure inlet via a pipeline.

[0015] The present invention adopts the above solution and has the following advantages:

[0016] By forming a low-pressure chamber within the cylinder body between the low-pressure piston and the cylinder head, a high-pressure chamber within the cylinder body between the high-pressure piston and the cylinder base, and a balance chamber within the cylinder body between the low-pressure and high-pressure pistons, the gas is first pressurized in the low-pressure chamber during the reciprocating motion of the low-pressure and high-pressure pistons. The pressurized gas then enters the high-pressure chamber through a pipeline for secondary pressurization before being discharged. The cooperation between the low-pressure and high-pressure chambers allows for differential pressurization of the compressed gas, significantly improving compression efficiency. During pressurization, the internal gas pressure in either the low-pressure or high-pressure chamber continuously increases, resulting in a continuous increase in piston force. The gas pressure in the balance chamber balances the piston force generated by the low-pressure or high-pressure chamber, ensuring stable piston operation, guaranteeing the overall lifespan of the cylinder, and reducing the pressure difference across the sealing ring between the piston and the cylinder body. This prevents the sealing ring from being impacted by gas pressure and improves the sealing effect. Attached image description:

[0017] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0018] In the diagram, 1. Cylinder body, 2. Cylinder head, 3. Cylinder base, 4. Low-pressure piston, 5. High-pressure piston, 6. Connecting rod, 7. Piston rod, 8. Low-pressure circulation chamber, 9. Low-pressure liquid inlet, 10. Low-pressure liquid outlet, 11. Low-pressure chamber, 12. Low-pressure air inlet, 13. Low-pressure air outlet, 14. High-pressure circulation chamber, 15. High-pressure liquid inlet, 16. High-pressure liquid outlet, 17. High-pressure chamber, 18. High-pressure air inlet, 19. High-pressure air outlet, 20. Balance chamber, 21. Balance air inlet, 22. Balance air outlet, 23. Low-pressure air inlet valve, 24. Low-pressure exhaust valve, 25. High-pressure air inlet valve, 26. High-pressure exhaust valve. Detailed implementation method:

[0019] 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.

[0020] like Figure 1 As shown, a differential circulating liquid seal cylinder with a balance chamber includes a cylinder body 1, a cylinder cover 2 at one end of the cylinder body 1, a cylinder base 3 at the other end of the cylinder body 1, and a piston structure inside the cylinder body 1. The piston structure includes a low-pressure piston 4, a high-pressure piston 5, and a connecting rod 6 that connects the low-pressure piston 4 and the high-pressure piston 5 as a whole. The high-pressure piston 5 is connected to a piston rod 7. The low-pressure piston 4, the connecting rod 6, and the high-pressure piston 5 are movably installed inside the cylinder body 1, and the piston rod 7 is movably installed inside the cylinder cover 2.

[0021] The outer surface of the low-pressure piston 4 is provided with a low-pressure circulation chamber 8. The low-pressure circulation chamber 8 is used to store circulating fluid for cooling, lubrication and liquid sealing of the cylinder 1. Sealing rings are provided on both sides of the low-pressure circulation chamber 8 for sealing. The side wall of the cylinder 1 is provided with a low-pressure inlet 9 and a low-pressure outlet 10 that are connected to the low-pressure circulation chamber 8. A low-pressure chamber 11 is formed in the cylinder 1 between the end face of the low-pressure piston 4 and the cylinder base 3. The side wall of the cylinder 1 is provided with a low-pressure air inlet 12 and a low-pressure air outlet 13 that are connected to the low-pressure chamber 11.

[0022] The outer surface of the high-pressure piston 5 is provided with a high-pressure circulation chamber 14. The high-pressure circulation chamber 14 is used to store circulating fluid to cool, lubricate and seal the cylinder 1. Sealing rings are provided on both sides of the high-pressure circulation chamber 14 for sealing. The side wall of the cylinder 1 is provided with a high-pressure liquid inlet 15 and a high-pressure liquid outlet 16 that are connected to the high-pressure circulation chamber 14. A high-pressure chamber 17 is formed between the cylinder 1 and the outer surface of the piston rod 7 between the end face of the high-pressure piston 5 and the cylinder cover 2. The side wall of the cylinder 1 is provided with a high-pressure air inlet 18 and a high-pressure air outlet 19 that are connected to the high-pressure chamber 17.

[0023] A balance chamber 20 is formed between the cylinder 1 and the outer surface of the connecting rod 6 between the low-pressure piston 4 and the high-pressure piston 5. The balance chamber 20 is used to balance the piston force. The side wall of the cylinder 1 is provided with a balance air inlet 21 and a balance air outlet 22 that are connected to the balance chamber 20.

[0024] The cylinder body 1 is connected to the cylinder base 3 and the cylinder cover 2 by bolts and is sealed with sealing rings.

[0025] A low-pressure air inlet valve 23 is provided at the low-pressure air inlet 12, and a low-pressure air outlet valve 24 is provided at the low-pressure air outlet 13.

[0026] A high-pressure air inlet valve 25 is provided at the high-pressure air inlet 18, and a high-pressure air outlet valve 26 is provided at the high-pressure air outlet 19.

[0027] Since there is a piston rod 7 between the high-pressure piston 5 and the cylinder head 2, while there is no piston rod between the low-pressure piston 4 and the cylinder base 3, the volume of the high-pressure chamber 17 is smaller than the volume of the low-pressure chamber 11. The smaller the volume, the greater the pressure on the gas, and the larger the volume, the smaller the pressure on the gas.

[0028] The low-pressure outlet 13 is connected to the high-pressure inlet 18 via a pipeline, allowing the pressurized gas in the low-pressure chamber 11 to enter the high-pressure chamber 17 for secondary pressurization.

[0029] The circulating fluid in the low-pressure circulation chamber 8 and the high-pressure circulation chamber 14 includes liquids such as lubricating oil, water, or ionic liquid. Preferably, this application uses ionic liquid because ionic liquid has the advantages of being non-polluting, easy to separate from products, easy to recover, and reusable. Even if it leaks, it will not pollute the gas.

[0030] Working principle:

[0031] During operation, piston rod 7 drives low-pressure piston 4 and high-pressure piston 5 to reciprocate synchronously within cylinder 1. When low-pressure piston 4 and high-pressure piston 5 move upward, low-pressure chamber 11 is in a compression state, and high-pressure chamber 17 is in an intake state. Specifically, low-pressure piston 4 performs a first-stage pressurization on the gas in low-pressure chamber 11. The gas in low-pressure chamber 11 enters high-pressure chamber 17 through low-pressure outlet 13, pipeline, and high-pressure inlet 18. During the compression process, the pressure of the gas in low-pressure chamber 11 continuously increases, and the force on the piston also continuously increases. The gas pressure in balance chamber 20... The piston force generated in the low-pressure chamber 11 can be balanced. When the low-pressure piston 4 and the high-pressure piston 5 move downwards, the high-pressure chamber 17 is in a compression state, and the low-pressure chamber 11 is in an intake state. Specifically, the high-pressure piston 5 performs secondary pressurization on the gas in the high-pressure chamber 17. The pressurized gas is discharged outward through the high-pressure outlet 19, while the gas enters the low-pressure chamber 11 through the low-pressure inlet 12. During the compression process, the pressure of the gas in the high-pressure chamber 17 continuously increases, and the force on the piston also continuously increases. The gas pressure in the balance chamber 20 can balance the piston force generated in the high-pressure chamber 17. This repeated process realizes the function of the reverse differential circulating liquid seal compression cylinder. The low-pressure chamber 11 and the high-pressure chamber 17 cooperate to perform differential pressurization on the compressed gas, greatly improving the compression efficiency. At the same time, the gas pressure in the balance chamber 20 can balance the piston force generated in the low-pressure chamber 11 or the high-pressure chamber 17, ensuring stable piston operation, guaranteeing the overall life of the cylinder, and reducing the pressure difference on both sides of the sealing ring between the piston and the cylinder body, avoiding pressure impact on the sealing ring and improving the sealing effect.

[0032] 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.

[0033] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A differential circulating liquid seal cylinder with a balance chamber, characterized in that: The cylinder includes a cylinder body, one end of which is provided with a cylinder head, and the other end of which is provided with a cylinder base. A piston structure is provided inside the cylinder body. The piston structure includes a low-pressure piston, a high-pressure piston, and a connecting rod that connects the low-pressure piston and the high-pressure piston as a whole. The high-pressure piston is connected to the piston rod. The low-pressure piston, the connecting rod, and the high-pressure piston are movably installed inside the cylinder body, and the piston rod is movably installed inside the cylinder head. The outer surface of the low-pressure piston is provided with a low-pressure circulation chamber, which is used to store circulating fluid for cooling, lubrication and liquid sealing of the cylinder. The side wall of the cylinder is provided with a low-pressure inlet and a low-pressure outlet connected to the low-pressure circulation chamber. A low-pressure chamber is formed in the cylinder between the end face of the low-pressure piston and the cylinder base. The side wall of the cylinder is provided with a low-pressure inlet and a low-pressure outlet connected to the low-pressure chamber. The outer surface of the high-pressure piston is provided with a high-pressure circulation chamber, which is used to store circulating fluid for cooling, lubrication and liquid sealing of the cylinder. The side wall of the cylinder is provided with a high-pressure inlet and a high-pressure outlet connected to the high-pressure circulation chamber. A high-pressure chamber is formed between the cylinder and the outer surface of the piston rod between the end face of the high-pressure piston and the cylinder head. The side wall of the cylinder is provided with a high-pressure air inlet and a high-pressure air outlet connected to the high-pressure chamber. A balance chamber is formed between the cylinder body and the outer surface of the connecting rod between the low-pressure piston and the high-pressure piston. The balance chamber is used to balance the piston force. The side wall of the cylinder body is provided with a balance air inlet and a balance air outlet that are connected to the balance chamber.

2. The differential circulating liquid seal cylinder with a balance chamber according to claim 1, characterized in that: The cylinder body is connected to the cylinder base and cylinder cover by bolts and sealed with sealing rings.

3. A differential circulating liquid seal cylinder with a balance chamber according to claim 1, characterized in that: The low-pressure air inlet is equipped with a low-pressure air inlet valve, and the low-pressure air outlet is equipped with a low-pressure air outlet valve.

4. A differential circulating liquid seal cylinder with a balance chamber according to claim 1, characterized in that: The high-pressure air inlet is equipped with a high-pressure air inlet valve, and the high-pressure air outlet is equipped with a high-pressure air outlet valve.

5. A differential circulating liquid seal cylinder with a balance chamber according to claim 1, characterized in that: The volume of the high-pressure chamber is smaller than the volume of the low-pressure chamber.

6. A differential circulating liquid seal cylinder with a balance chamber according to claim 1, characterized in that: The low-pressure outlet is connected to the high-pressure inlet via a pipeline.

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