Cylinder device of propylene recovery compressor
By designing multi-stage cylinders and piston bodies in the compressor, precise adjustment of cylinder clearance is solved, and the problems of complex and low efficiency of clearance adjustment in traditional compressors are improved, and the operation efficiency and stability of the compressor are improved.
Patent Information
- Application Number
- CN202421988490.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-08-16
AI Technical Summary
In traditional compressor design, the adjustment of cylinder clearance is complex and costly, resulting in reduced compressor efficiency, increased energy consumption, and it is difficult to achieve accurate adjustment.
A cylinder device for acrylic recovery compressor is designed. Through the design of multi-stage cylinders and corresponding piston bodies, precise adjustment of cylinder gaps at each stage can be achieved, gas leakage is reduced, and compression efficiency is improved.
It has achieved a reasonable reduction in the compressor gas injection volume, improved the operating efficiency and stability of the compressor, reduced the failure rate and maintenance cost, and has high promotion value.
Smart Images
Figure CN222863566U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of compressors, and in particular relates to a cylinder device of a propylene recovery compressor. Background Art
[0002] During the operation of the compressor, the clearance between the cylinder and the piston (i.e., cylinder clearance) has an important impact on the performance of the compressor. Too large or too small a clearance will lead to reduced compressor efficiency, increased energy consumption, and even affect the life of the machine. The propylene recovery compressor (DW-8 / 19.6, 75KW) of the polypropylene unit is designed to have a large gas output, and the compressor wastes work. In traditional compressor design, the adjustment of the cylinder clearance mainly depends on empirical formulas and test data, and once the compressor is put into operation, the adjustment of the clearance becomes relatively difficult. As a result, in actual applications, the operating efficiency of the compressor is often affected by unreasonable cylinder clearance.
[0003] If the cylinder clearance is too large, the compressor will inhale too much invalid volume during the suction process, thereby reducing the suction efficiency of the compressor; at the same time, during the compression process, too large a clearance will also reduce the compression ratio of the compressor, resulting in a decrease in exhaust pressure and exhaust volume. On the contrary, if the cylinder clearance is too small, the piston may collide with the cylinder head when approaching the top dead center, causing damage to the machine; at the same time, too small a clearance will also cause the compressor to have too much high-pressure gas remaining during the exhaust process, resulting in increased energy consumption and temperature of the compressor.
[0004] Therefore, in order to improve the operating efficiency and stability of the compressor, the cylinder clearance needs to be accurately adjusted. However, traditional clearance adjustment methods have problems such as complex operation, high cost, and low adjustment accuracy. For example, some methods require the disassembly of the main components of the compressor, which not only increases the maintenance cost, but also may cause damage to the overall structure of the compressor. Therefore, it is of great significance to develop a simple, efficient, and high-precision clearance adjustment device. Utility Model Content
[0005] The technical problem to be solved by the utility model is to overcome the above-mentioned defects in the prior art and provide a propylene recovery compressor cylinder device, which achieves a reasonable reduction in the compressor air volume by accurately adjusting the clearance of each level of cylinders, while improving the operating efficiency and stability of the compressor.
[0006] The propylene recovery compressor cylinder device described in the utility model includes a primary cylinder and a secondary cylinder. The primary cylinder is provided with a primary cylinder cover, the secondary cylinder is provided with a secondary cylinder cover, the secondary cylinder is provided with a secondary piston body and a tertiary piston body, the primary cylinder has a primary piston body inside, the primary cylinder has an axial side clearance of 3.5 mm, the cover side of the primary cylinder is 54 mm, the axial side clearance of the secondary piston body is 3.5 mm, and the cover side clearance of the secondary piston body is 42 mm. Through the design of multi-stage cylinders (at least two stages) and corresponding piston bodies, efficient recovery and compression of propylene is achieved. The coordination between each stage of cylinders and cylinder covers and the design of the axial side and cover side clearances of the piston body are intended to reduce gas leakage, improve compression efficiency, protect the cylinder and piston body from excessive wear, and extend the service life of the equipment.
[0007] Preferably, the shaft side clearance of the three-stage piston body is 3.5 mm, and the cover side clearance of the three-stage piston body is 42 mm. The added three-stage piston body design further improves the compression ratio and efficiency of the compressor. The shaft side and cover side clearance design is also to reduce gas leakage and ensure an efficient and stable compression process.
[0008] Preferably, there is a side clearance between the primary piston body and the primary cylinder head. This clearance allows the piston body to move freely in the cylinder while reducing wear caused by friction and overheating. Appropriate cylinder head side clearance design helps maintain stable operation of the compressor and extend its service life.
[0009] Preferably, the secondary piston body and the tertiary piston body are sleeved. The sleeved piston body design can reduce the volume of the entire compressor device while maintaining or improving the compression efficiency. This design may also involve a complex mechanical structure to ensure that the piston bodies at each level can work synchronously and coordinately.
[0010] Preferably, there is a side clearance between the secondary piston body and the secondary cylinder head. Similar to the side clearance of the primary cylinder head, the side clearance of the secondary cylinder head is also to reduce the friction and wear between the piston body and the cylinder head, while allowing the piston body to move smoothly in the cylinder to ensure the stability and efficiency of the compression process.
[0011] Preferably, the primary cylinder and the secondary cylinder are connected by a coupling. The coupling connects the primary cylinder and the secondary cylinder to ensure that they can operate synchronously and smoothly. This connection method not only transmits power, but also allows a certain axial and angular offset to cope with vibrations and minor misalignments during the operation of the compressor, protecting the compressor from damage. At the same time, it is also convenient for installation, commissioning and maintenance.
[0012] The propylene recovery compressor cylinder device of the utility model, after the compressor is started, first enters the gas suction stage, the piston body in the first-stage cylinder moves downward (or upward) to form a negative pressure, and sucks the propylene gas to be recovered. Subsequently, the gas enters the compression stage, the first-stage piston body preliminarily compresses the gas and transmits it to the second-stage cylinder through the internal channel, and the second-stage piston body (and the third-stage piston body that may exist) continue to compress the gas until the required pressure is reached. In this process, the precise gap design between the cylinder head and the piston body of each stage effectively reduces gas leakage and improves the compression efficiency. When the piston bodies of each stage complete the compression stroke, the high-pressure propylene gas is discharged from the compressor through the exhaust port and enters the subsequent processing system. This process is repeated to achieve continuous recovery and compression of propylene gas. As a key component, the coupling ensures the synchronous operation between the cylinders of each stage and maintains the overall stability and efficiency of the compressor. At the same time, continuous monitoring is required during the operation of the compressor, including real-time tracking of parameters such as temperature, pressure, and vibration, so as to promptly discover and deal with potential problems.
[0013] Compared with the prior art, the utility model has the following beneficial effects:
[0014] The utility model discloses a propylene recovery compressor cylinder device, realizes the precise adjustment of multi-stage cylinder clearance, improves the adaptability of the compressor to different working conditions, reduces the whole machine pumping volume, is helpful for energy conservation and emission reduction and cost control, optimizes the piston dead point clearance design, reduces the failure rate and maintenance cost caused by improper clearance, the overall transformation plan is scientific and reasonable, easy to implement, and has high promotion value. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the propylene recovery compressor cylinder device of the utility model.
[0016] Figure 2 It is a schematic diagram of an improvement and enlargement of the cylinder clearance increase of the utility model.
[0017] In the figure: 1. first-stage cylinder head; 2. first-stage cylinder; 3. first-stage cylinder head side clearance; 4. first-stage piston body; 5. second-stage cylinder; 6. second-stage cylinder head; 7. second-stage cylinder head side clearance; 8. coupling; 9. second-stage piston body; 10. third-stage piston body. DETAILED DESCRIPTION
[0018] The utility model is further described below in conjunction with specific embodiments.
[0019] The propylene recovery compressor (DW-8 / 19.6, 75KW) of the polypropylene unit is designed to have a large gas output, which results in wasted work on the compressor. In order to reduce energy consumption and lower power consumption, the propylene recovery compressor is modified to save energy and increase the fixed clearance. The fixed clearance of the first-stage cylinder 2 and the second-stage cylinder 5 is modified. The first-stage cylinder clearance is increased by 28%, the second-stage cylinder clearance is increased by 20%, and the air volume is reduced by 15%. The piston dead point clearance on the shaft side and cover side of the propylene recovery compressor was originally designed to be 3±0.5mm. After the modification, the first-stage piston shaft side clearance is 3.5mm, and the cover side clearance is 54mm. The second and third-stage piston shaft side clearances are 3.5mm, and the cover side clearance is 42mm. Figure 2 shown.
[0020] like Figure 1 As shown, the cylinder device of the propylene recovery compressor described in the utility model comprises a primary cylinder 2 and a secondary cylinder 5. The primary cylinder 2 is provided with a primary cylinder head 1. The secondary cylinder 5 is provided with a secondary piston body 9 and a tertiary piston body 10. The secondary cylinder 5 is provided with a secondary cylinder head 6. The primary cylinder 2 has a primary piston body 4 inside. The axial side clearance of the primary piston body 4 is 3.5 mm, the cover side of the primary cylinder 2 is 54 mm, the axial side clearance of the secondary piston body 9 is 3.5 mm, and the cover side clearance of the secondary piston body 9 is 42 mm. The efficient recovery and compression of propylene is achieved by designing at least two stages of the multi-stage cylinder and the corresponding piston body. The coordination between the cylinders at each stage and the cylinder head and the axial side and cover side clearance design of the piston body are intended to reduce gas leakage, improve compression efficiency, protect the cylinder and the piston body from excessive wear, and extend the service life of the equipment.
[0021] The shaft side clearance of the three-stage piston body 10 is 3.5 mm, and the cover side clearance of the three-stage piston body 10 is 42 mm. The added three-stage piston body design further improves the compression ratio and efficiency of the compressor. The shaft side and cover side clearance design is also to reduce gas leakage and ensure an efficient and stable compression process.
[0022] There is a first-stage cylinder head side clearance 3 between the first-stage piston body 4 and the first-stage cylinder head 1. This clearance allows the piston body to move freely in the cylinder while reducing wear caused by friction and overheating. Appropriate cylinder head side clearance design helps maintain stable operation of the compressor and extend its service life.
[0023] The secondary piston body 9 and the tertiary piston body 10 are sleeved. The sleeved piston body design can reduce the volume of the entire compressor device while maintaining or improving the compression efficiency. This design may also involve a complex mechanical structure to ensure that the piston bodies at each level can work synchronously and harmoniously.
[0024] There is a secondary cylinder head side gap 7 between the secondary piston body 9 and the secondary cylinder head 6. Similar to the primary cylinder head side gap, the secondary cylinder head side gap is also to reduce the friction and wear between the piston body and the cylinder head, while allowing the piston body to move smoothly in the cylinder to ensure the stability and efficiency of the compression process.
[0025] The primary cylinder 2 and the secondary cylinder 5 are connected by a coupling 8. The coupling 8 connects the primary cylinder 2 and the secondary cylinder 5 to ensure that they can operate synchronously and smoothly. This connection method not only transmits power, but also allows a certain axial and angular offset to cope with vibrations and minor misalignments during the operation of the compressor and protect the compressor from damage. At the same time, it is also convenient for installation, commissioning and maintenance.
[0026] The propylene recovery compressor cylinder device of the utility model, after the compressor is started, first enters the gas suction stage, the piston body in the first-stage cylinder 2 moves downward (or upward) to form a negative pressure, and sucks the propylene gas to be recovered. Subsequently, the gas enters the compression stage, the first-stage piston body 4 preliminarily compresses the gas and transmits it to the second-stage cylinder 5 through the internal channel, and the second-stage piston body 9 (and the third-stage piston body 10 that may exist) continue to compress the gas until the required pressure is reached. In this process, the precise gap design between the cylinder head and the piston body of each stage effectively reduces gas leakage and improves the compression efficiency. When the piston body of each stage completes the compression stroke, the high-pressure propylene gas is discharged from the compressor through the exhaust port and enters the subsequent processing system. This process is repeated to achieve continuous recovery and compression of propylene gas. The coupling, as a key component, ensures the synchronous operation between the cylinders of each stage and maintains the overall stability and efficiency of the compressor. At the same time, continuous monitoring is required during the operation of the compressor, including real-time tracking of parameters such as temperature, pressure, and vibration, so as to timely discover and deal with potential problems. After the modification of the propylene recovery compressor is completed, it is put into operation, and the gas transmission volume meets the process operation requirements. Comparing the 72h operating current before and after the transformation, the average value decreased by 23.3A, and the energy consumption decreased by about 14.2% compared with before the transformation.
[0027] Of course, the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and any equivalent changes and improvements made by ordinary technicians in the technical field within the essential scope of the present invention shall fall within the scope of the patent coverage of the present invention.
Claims
1. A propylene recovery compressor cylinder device, characterized in that: The invention comprises a primary cylinder (2) and a secondary cylinder (5), wherein the primary cylinder (2) is provided with a primary cylinder cover (1), the secondary cylinder (5) is provided with a secondary piston body (9) and a tertiary piston body (10), the secondary cylinder (5) is provided with a secondary cylinder cover (6), the primary cylinder (2) has a primary piston body (4) inside, the primary cylinder (4) has an axial side clearance of 3.5 mm, the cover side clearance of the primary cylinder (2) is 54 mm, the secondary piston body (9) has an axial side clearance of 3.5 mm, and the cover side clearance of the secondary piston body (9) is 42 mm.
2. The propylene recovery compressor cylinder device according to claim 1, characterized in that: The shaft side clearance of the three-stage piston body (10) is 3.5 mm, and the cover side clearance of the three-stage piston body (10) is 42 mm.
3. The propylene recovery compressor cylinder device according to claim 1, characterized in that: A first-stage cylinder head side gap (3) is formed between the first-stage piston body (4) and the first-stage cylinder head (1).
4. The propylene recovery compressor cylinder device according to claim 1, characterized in that: The secondary piston body (9) and the tertiary piston body (10) are sleeved.
5. The propylene recovery compressor cylinder device according to claim 1, characterized in that: A secondary cylinder head side gap (7) is provided between the secondary piston body (9) and the secondary cylinder head (6).
6. The propylene recovery compressor cylinder device according to claim 1, characterized in that: The primary cylinder (2) and the secondary cylinder (5) are connected via a coupling (8).