A leak-proof reciprocating compressor

Abstract

The application discloses a kind of leak-proof reciprocating compressor, belong to compressor field, including crankcase, cylinder assembly, bushing assembly, gas buffer baffle and dynamic sealing system.Bushing body two ends are respectively sealed with cylinder assembly and crankcase connection, piston rod penetrates bushing body and extends into crankcase, and oil cavity is formed between bushing body and piston rod.Dynamic sealing system includes oil pressure monitoring port, oil pressure regulating valve and controller, and controller adjusts oil pressure regulating valve opening according to the comparison result of oil pressure monitoring signal and preset pressure to dynamically control oil cavity oil pressure.Gas buffer baffle is arranged in bushing body, can guide leaked gas to rise backflow, prevent it from sinking condensation.The application cooperates with gas buffer baffle and dynamic sealing system, so that oil cavity pressure is always in the best sealing range, effectively prevents gas from entering crankcase, realizes low leakage even zero leakage compression for toxic, harmful, flammable and explosive and rare gas.

Description

Technical Field

[0001] This invention relates to the field of compressors, and in particular to a leak-proof reciprocating compressor. Background Technology

[0002] With the increasing demand for compression of toxic, harmful, rare and other special gases in fields such as chemical, biological and aerospace industries, reciprocating compressors are required to have low or even zero leakage sealing performance to meet their operational requirements in terms of safety, economy and environmental protection.

[0003] Existing reciprocating compressors have an intermediate cavity between the piston assembly and the crankcase, and sealing structures such as piston rings and cylinder packing are installed at the cylinder and piston rod. However, due to the high gas pressure inside the cylinder during operation, the compressed gas inevitably leaks through the gap between the piston rod and the packing. This leaked gas first enters the intermediate cavity between the cylinder and the crankcase, and may further seep into the crankcase through the sealing structures at the joints of moving parts.

[0004] When leaked gas enters the crankcase, it causes an increase in internal pressure, which is detrimental to the stability of the crankcase. For flammable and explosive gases, the leaked gas mixes with air inside the crankcase, posing a significant safety risk of combustion and explosion; for toxic gases, leakage into the environment directly threatens the health of operators and pollutes the environment; for rare or expensive gases, leakage means direct economic loss.

[0005] Therefore, how to design a compressor that can effectively prevent the compressed medium from entering the crankcase, while properly handling leaked gas and its possible entrained liquids, to ensure long-term, safe and stable operation of the compressor, and reduce leakage and improve the compressor's economy, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] This invention provides a leak-proof reciprocating compressor, which solves the gas leakage problem of existing reciprocating compressors by setting a gas buffer baffle and a dynamic sealing system.

[0007] To solve the above-mentioned technical problems, the present invention provides a leak-proof reciprocating compressor, comprising: Crankcase; A cylinder assembly containing a piston and piston rod; A connecting cylinder assembly includes a connecting cylinder body, the two ends of which are respectively sealed to the cylinder assembly and the crankcase; one end of the piston rod is connected to the piston, and the other end passes through the connecting cylinder body and extends into the crankcase; the connecting cylinder body is provided with an intake return port for communicating with an intake buffer tank; an oil chamber is formed between the connecting cylinder body and the piston rod, and the connecting cylinder body is provided with an oil inlet and an oil outlet communicating with the oil chamber; A gas buffer baffle is fixedly installed inside the receiving cylinder body and sleeved on the piston rod. The gas buffer baffle is located between the air inlet return port and the cylinder assembly. And, an integrated dynamic sealing system is provided on the receiving cylinder body, the dynamic sealing system comprising: An oil pressure monitoring port is connected to the oil chamber and is used to monitor the oil pressure in the oil chamber in real time and generate a pressure signal; An oil pressure regulating valve is installed in the oil line of the oil inlet and / or the oil outlet; The controller is connected to the oil pressure monitoring port and the oil pressure regulating valve. The controller receives the pressure signal and controls the opening of the oil pressure regulating valve according to the comparison result of the pressure signal and the preset pressure, so as to dynamically adjust the oil pressure in the oil chamber.

[0008] In a preferred embodiment of the present invention, the gas buffer baffle includes an arc portion and a baffle. The thickness of the arc portion is greater than the thickness of the baffle. The baffle is located on the top extension line of the arc portion facing the crankcase. A through hole for the piston rod to pass through is provided on the arc portion. An arc-shaped groove is provided on the side of the arc portion facing the cylinder assembly. The through hole is located in the arc-shaped groove. The arc-shaped groove is used to guide the gas brought in by the piston rod to rise.

[0009] In a preferred embodiment of the present invention, a vent is provided at the top of the receiving cylinder body.

[0010] In a preferred embodiment of the present invention, a liquid discharge port is provided at the bottom of the receiving cylinder body.

[0011] In a preferred embodiment of the present invention, a first sealing ring is provided between the connecting surface of the receiving cylinder body and the cylinder assembly.

[0012] In a preferred embodiment of the present invention, a sealing assembly is further included, which is located at the connection between the cylinder assembly and the connecting sleeve assembly and is sleeved on the piston rod.

[0013] In a preferred embodiment of the present invention, the sealing assembly is a cylindrical structure with annularly distributed cooling channels inside. The sealing assembly has an inlet and an outlet communicating with the cooling channels. The inlet is located at the lower part of the sealing assembly, and the outlet is located at the upper part of the sealing assembly.

[0014] In a preferred embodiment of the present invention, a plurality of spaced second sealing rings are further provided on the inner side of the sealing assembly.

[0015] In a preferred embodiment of the present invention, a lubricating oil pump is further included. The oil inlet and oil outlet of the receiving cylinder body are respectively connected to the crankcase through pipes, and the lubricating oil pump is disposed on the pipe between the oil inlet of the receiving cylinder body and the crankcase.

[0016] In a preferred embodiment of the present invention, the air inlet return port is connected to the low-pressure side of the air inlet buffer tank through a return pipeline.

[0017] The beneficial effects of the present invention are as follows: The present invention provides a leak-proof reciprocating compressor, which sets up a gas buffer baffle and opens an arc-shaped groove on it. The arc-shaped groove guides the gas leaking from the cylinder side to flow upward, effectively preventing the gas from sinking and condensing into liquid at the bottom of the receiving cylinder. This improves the recovery efficiency of the leaked gas returning to the intake buffer tank through the intake return port, while reducing the corrosion of the seals by the liquid. By setting up a dynamic sealing system integrated on the receiving cylinder body, the oil pressure in the oil chamber is monitored in real time using the oil pressure monitoring port. The controller automatically adjusts the opening of the oil pressure regulating valve according to the preset pressure, so that the oil chamber pressure is always kept within the optimal sealing pressure range. It can adapt to different working conditions such as compressor start-up and shutdown, load changes, and exhaust pressure fluctuations, significantly improving the sealing effect and effectively preventing gas from entering the crankcase. Through the synergistic effect of the gas buffer baffle and the dynamic sealing system, low-leakage or even zero-leakage compression of toxic, harmful, flammable, explosive and rare gases is achieved, which greatly improves the safety, economy and environmental protection of the compressor. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of a preferred embodiment of a leak-proof reciprocating compressor according to the present invention; Figure 2 This is a schematic diagram of the connection structure between the piston and piston rod shown. Figure 3 This is a three-dimensional structural schematic diagram of the connecting tube assembly shown. Figure 4 This is a three-dimensional structural schematic diagram of the sealing assembly shown. Figure 5 This is a three-dimensional structural schematic diagram of the gas buffer diaphragm shown. The components in the attached diagram are labeled as follows: 10. Crankcase; 11. Crankshaft assembly; 12. Connecting rod assembly; 13. Crosshead assembly; 20. Cylinder assembly; 21. Piston; 22. Piston rod; 30. Connecting cylinder assembly; 31. Connecting cylinder body; 311. First sealing ring; 312. Air inlet return port; 313. Vent port; 314. Liquid outlet port; 32. Oil chamber; 321. Oil inlet port; 322. Oil outlet port; 33. Oil pressure monitoring port; 34. Oil pressure regulating valve. 40. Sealing assembly; 41. Second sealing ring; 42. Cooling channel; 43. Water inlet; 44. Water outlet; 50. Gas buffer plate; 51. Arc-shaped part; 52. Baffle; 511. Through hole; 512. Arc-shaped groove. 60. Intake buffer tank; 70. Exhaust buffer tank. Detailed Implementation

[0019] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0020] Example 1 like Figure 1 As shown, this embodiment provides a leak-proof reciprocating compressor, which mainly includes: a crankcase 10, a cylinder assembly 20, a connecting cylinder assembly 30, a sealing assembly 40, a gas buffer plate 50, and a dynamic sealing system integrated on the connecting cylinder assembly.

[0021] Specifically, the crankcase 10 contains a crankshaft assembly 11, a connecting rod assembly 12, and a crosshead assembly 13, which are connected in sequence to convert rotational motion into reciprocating linear motion of the piston 21. The crankcase 10 also serves as a lubricating oil tank, storing lubricating oil at its bottom and containing a lubricating oil pump (not shown in the figure) to supply oil to the moving parts.

[0022] like Figure 1 and Figure 2 As shown, the cylinder assembly 20 includes a piston 21 and a piston rod 22. The piston 21 is fitted with piston rings to seal the gap between the piston 21 and the cylinder wall. One end of the piston rod 22 is fixedly connected to the piston 21, and the other end passes through the end cap of the cylinder assembly 20, and then sequentially passes through the sealing assembly 40, the gas buffer baffle 50, and the connecting cylinder assembly 30 before extending into the crankcase 10 and connecting to the crosshead assembly 13. The inlet end of the cylinder assembly 20 is connected to an inlet buffer tank 60, and its outlet end is connected to an exhaust buffer tank 70, used for inlet and exhaust buffering of the compressed gas.

[0023] like Figure 3As shown, the connector assembly 30 includes a cylindrical connector body 31. The connector body 31 is located between the cylinder assembly 20 and the crankcase 10, and its left end is sealed to the end cap of the cylinder assembly 20 by bolts, and its right end is sealed to the end cap of the crankcase 10 by bolts. A first sealing ring 311 is provided between the connecting surfaces of the connector body 31 and the cylinder assembly 20 to ensure a static seal between the connector body and the cylinder, preventing gas from leaking out from the connecting flange.

[0024] In addition, the receiving cylinder body 31 is provided with an air inlet return port 312, which is connected to the low-pressure side of the air inlet buffer tank 60 through a gas pipe, for allowing gas leaking into the receiving cylinder assembly 30 to flow back into the air inlet buffer tank 60. A vent port 313 is provided at the top of the receiving cylinder body 31 to release gas and prevent excessive gas pressure in the receiving cylinder body 31. A liquid drain port 314 is provided at the bottom of the receiving cylinder body 31 for discharging liquid.

[0025] The sealing assembly 40 is located at the connection between the cylinder assembly 20 and the connecting sleeve assembly 30, and is sleeved on the piston rod 22 to achieve a seal between the cylinder assembly and the connecting sleeve assembly. Specifically, as shown... Figure 4 As shown, the sealing assembly 40 has a cylindrical structure with multiple spaced-apart second sealing rings 41 on its inner side to enhance the sealing effect. The sealing assembly 40 also has annularly distributed cooling channels 42. The sealing assembly has an inlet 43 and an outlet 44 communicating with the cooling channels 42. The inlet 43 is located at the lower part of the sealing assembly, and the outlet 44 is located at the upper part. Through the design of the cooling channels 42, the cooling water flowing through them carries away the heat generated by the piston assembly's movement, thereby improving the service life of the second sealing rings 41.

[0026] The gas buffer baffle 50 is fixedly disposed inside the receiving cylinder body 31 and sleeved on the piston rod 22, and is located between the air inlet return port 312 and the cylinder assembly 20. It is used to prevent the gas brought in by the reciprocating motion of the piston rod 22 from sinking downwards, and to make it flow upwards and return to the air inlet buffer tank through the air inlet return port 312.

[0027] Specifically, such as Figure 5 As shown, the gas buffer baffle 50 includes two main parts: an arcuate portion 51 and a baffle 52. The thickness of the arcuate portion 51 is greater than the thickness of the baffle 52. The baffle 52 is located on the top extension line of the arcuate portion 51 facing the crankcase 10. A through hole 511 for the piston rod 22 to pass through is provided on the arcuate portion 51. An arc-shaped groove 512 is also provided on the side of the arcuate portion 51 facing the cylinder assembly 20. The through hole 511 is located at the center of the arc-shaped groove 512.

[0028] When the piston rod 22 reciprocates, a small amount of gas inevitably leaks into the receiver body 31 from the gap between the piston rod 22 and the sealing assembly 40. This gas is carried out by the piston rod 22 and first impacts the arc-shaped portion 51 of the gas buffer baffle 50. The curved surface structure of the arc-shaped groove 512 guides the gas upward, preventing it from sinking to the bottom of the receiver body. The upward-flowing gas is blocked and redirected by the baffle 52, eventually exiting from the air inlet return port 312 at the top of the receiver body 31. This structure effectively prevents leaked gas from condensing into liquid at the bottom of the receiver body 31, reducing the corrosion of the seals and contamination of the oil.

[0029] An oil chamber 32 is formed between the receiving cylinder body 31 and the piston rod 22. The receiving cylinder body 31 has an oil inlet 321 and an oil outlet 322 communicating with the oil chamber 32. Additionally, the receiving cylinder body integrates a dynamic sealing system, specifically including an oil pressure monitoring port 33, an oil pressure regulating valve 34, and a controller. The oil pressure monitoring port 33 communicates with the oil chamber 32 and is used to monitor the oil pressure within the oil chamber 32 in real time and generate a pressure signal. The oil pressure regulating valve 34 is located on the oil path of the oil outlet 322.

[0030] The controller employs a programmable logic controller (PLC) or an embedded microcontroller. The controller's input is connected to the pressure sensor signal at the oil pressure monitoring port 33, and its output is connected to the control signal at the oil pressure regulating valve 34. The controller has a preset pressure value, which can be set according to the compressor's discharge pressure or process requirements. It is typically set to a value slightly higher than the expected gas pressure inside the receiving cylinder body 31, for example, 1.1 to 1.2 times higher than the discharge pressure, or at least 0.2 to 0.5 MPa higher than the crankcase pressure.

[0031] The controller operates as follows: The controller reads the actual oil pressure value fed back from the oil pressure monitoring port 33 in real time and compares it with the preset pressure value. If the actual pressure is lower than the preset pressure, the controller outputs a signal to reduce the opening of the oil pressure regulating valve 34, increasing the return oil resistance and raising the oil pressure in the oil chamber; If the actual pressure is higher than the preset pressure, the opening of the oil pressure regulating valve 34 will be increased to reduce the return oil resistance and lower the oil chamber pressure.

[0032] Through this closed-loop control, the oil pressure in the oil chamber 32 can always be maintained near the preset pressure. Even if the compressor operating conditions change (such as fluctuations in discharge pressure or temperature changes), it can be dynamically adjusted to ensure that the oil pressure is always greater than the pressure of the leaking gas, thereby effectively preventing gas from seeping into the crankcase 10. Since the compressed gas is insoluble in the pressurized oil, a sealing effect is achieved, thus achieving the purpose of no leakage.

[0033] In this embodiment, the oil inlet 321 and the oil outlet 322 are respectively connected to the crankcase 10 via pipes.

[0034] Example 2 The difference from Embodiment 1 is that the oil pressure regulating valve 34 is located in the oil line of the oil inlet 321.

[0035] The controller operates as follows: The controller reads the actual pressure value of the oil chamber from the oil pressure monitoring port 33 in real time and compares it with the preset pressure value. If the actual pressure is lower than the preset pressure, the controller outputs a signal to increase the opening of the oil pressure regulating valve 34, increasing the oil flow rate and raising the oil chamber pressure; if the actual pressure is higher than the preset pressure, the controller outputs a signal to decrease the opening of the oil pressure regulating valve 34, decreasing the oil flow rate and lowering the oil chamber pressure.

[0036] Through this closed-loop control, the oil pressure in the oil chamber 32 can always be maintained near the preset pressure, achieving dynamic sealing.

[0037] Example 3 The difference from Embodiment 1 is that the oil inlet 321 and the oil outlet 322 are respectively connected to an external independent lubrication station.

[0038] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A leak-proof reciprocating compressor, characterized in that, include: Crankcase; A cylinder assembly containing a piston and piston rod; A connecting cylinder assembly includes a connecting cylinder body, the two ends of which are respectively sealed to the cylinder assembly and the crankcase; one end of the piston rod is connected to the piston, and the other end passes through the connecting cylinder body and extends into the crankcase; the connecting cylinder body is provided with an intake return port for communicating with an intake buffer tank; an oil chamber is formed between the connecting cylinder body and the piston rod, and the connecting cylinder body is provided with an oil inlet and an oil outlet communicating with the oil chamber; A gas buffer baffle is fixedly installed inside the receiving cylinder body and sleeved on the piston rod. The gas buffer baffle is located between the air inlet return port and the cylinder assembly. And, an integrated dynamic sealing system is provided on the receiving cylinder body, the dynamic sealing system comprising: An oil pressure monitoring port is connected to the oil chamber and is used to monitor the oil pressure in the oil chamber in real time and generate a pressure signal; An oil pressure regulating valve is installed in the oil line of the oil inlet and / or the oil outlet; The controller is connected to the oil pressure monitoring port and the oil pressure regulating valve. The controller receives the pressure signal and controls the opening of the oil pressure regulating valve according to the comparison result of the pressure signal and the preset pressure, so as to dynamically adjust the oil pressure in the oil chamber.

2. The leak-proof reciprocating compressor according to claim 1, characterized in that, The gas buffer baffle includes an arc portion and a baffle. The thickness of the arc portion is greater than the thickness of the baffle. The baffle is located on the top extension line of the arc portion facing the crankcase. A through hole for the piston rod to pass through is provided on the arc portion. An arc-shaped groove is provided on the side of the arc portion facing the cylinder assembly. The through hole is located in the arc-shaped groove. The arc-shaped groove is used to guide the gas brought in by the piston rod to rise.

3. A leak-proof reciprocating compressor according to claim 1, characterized in that, The top of the receiving cylinder body is provided with a vent.

4. A leak-proof reciprocating compressor according to claim 1, characterized in that, The bottom of the receiving cylinder body is provided with a liquid discharge port.

5. A leak-proof reciprocating compressor according to claim 1, characterized in that, A first sealing ring is provided between the connecting surface of the receiving cylinder body and the cylinder assembly.

6. A leak-proof reciprocating compressor according to claim 1, characterized in that, It also includes a sealing assembly located at the connection between the cylinder assembly and the connecting sleeve assembly, and sleeved on the piston rod.

7. A leak-proof reciprocating compressor according to claim 6, characterized in that, The sealing assembly is a cylindrical structure with annularly distributed cooling channels inside. The sealing assembly has an inlet and an outlet that communicate with the cooling channels. The inlet is located at the lower part of the sealing assembly, and the outlet is located at the upper part of the sealing assembly.

8. A leak-proof reciprocating compressor according to claim 6, characterized in that, The sealing assembly also has multiple spaced second sealing rings on its inner side.

9. A leak-proof reciprocating compressor according to claim 1, characterized in that, It also includes a lubricating oil pump. The oil inlet and oil outlet of the receiving cylinder body are respectively connected to the crankcase through pipes. The lubricating oil pump is installed on the pipe between the oil inlet of the receiving cylinder body and the crankcase.

10. A leak-proof reciprocating compressor according to claim 1, characterized in that, The air inlet return port is connected to the low-pressure side of the air inlet buffer tank via a return pipeline.

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