A screw air compressor lubricating oil cooling system
Patent Information
- Application Number
- CN202522085859.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-28
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-09-28
AI Technical Summary
[0004]但由于夏季温度高，地面易出现扬尘，使得风冷却器上经常堵塞，风量减少使得冷却效果不佳，润滑油无法得到快速降温，影响设备的使用，且经常需要进行维修
[0012]本实用新型的优点：根据冷却后润滑油的温度，采用水冷却的方式对润滑油进行降温，减少了维修次数；能够在夏季循环冷水温度升高的情况下，通过将循环水切换至第四管线，能够有效的保证润滑油的冷却效果，保证了螺杆式空压机的正常运行。
Smart Images
Figure CN224835397U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of screw compressors, and specifically to a lubricating oil cooling system for screw air compressors. Background Technology
[0002] Screw air compressors are a type of air compressor that generates a lot of heat during operation. This can easily lead to lubricant deterioration, seal aging, and increased operating costs. Furthermore, the mixture of high-temperature water vapor and oil vapor can seriously affect the normal operation of the air compressor, so cooling is necessary.
[0003] In the process of treating industrial wastewater in coal chemical enterprises, dust and impurities in the air are removed by air filters. The filtered air enters the compression chamber of a screw air compressor and mixes with lubricating oil. After mixing, the air is compressed by the compressor to form a high-temperature compressed air and oil mixture. The high-temperature compressed air and oil mixture enters an oil-gas separator for gas-liquid separation. The separated compressed air and lubricating oil enter an air cooler for cooling. The cooled air is then sent to an oxygen production system to produce oxygen or to the factory air pipeline network for use as factory air. The cooled lubricating oil is sent back to the screw air compressor for continued recycling.
[0004] However, due to the high summer temperatures and dust on the ground, the air cooler is often clogged, reducing airflow and resulting in poor cooling. The lubricating oil cannot be cooled down quickly, affecting the use of the equipment and requiring frequent maintenance. Utility Model Content
[0005] The purpose of this invention is to provide a lubricating oil cooling system for a screw air compressor.
[0006] This utility model is implemented by the following technical solution: A screw air compressor lubricating oil cooling system includes an air filter, a screw air compressor, and an oil separator. The air filter's outlet is connected to the screw air compressor's inlet; the screw air compressor's exhaust end is connected to the oil separator's inlet; the oil separator's outlet is connected to the inlet of a first shell-and-tube heat exchanger; the oil separator's outlet is connected to the oil inlet of a second shell-and-tube heat exchanger; the second shell-and-tube heat exchanger's outlet is connected to the screw air compressor's inlet; a cooling tower is connected to one end of a first pipeline via a first water pump; the other end of the first pipeline is connected to the inlet of the second shell-and-tube heat exchanger; the second shell-and-tube heat exchanger's outlet is connected to the first shell-and-tube heat exchanger's inlet via a second pipeline; and the first shell-and-tube heat exchanger's outlet is connected to the cooling tower via a third pipeline. A fourth pipeline is connected in parallel to the first pipeline, and a chiller unit and a second water pump are sequentially connected to the fourth pipeline along the flow direction.
[0007] Preferably, a first regulating valve is installed between the oil separator and the first shell-and-tube heat exchanger.
[0008] Preferably, a second regulating valve is installed between the oil separator and the second shell-and-tube heat exchanger.
[0009] Preferably, a third regulating valve and a pressure gauge are installed on the first pipeline.
[0010] Preferably, a fourth regulating valve is installed on the fourth pipeline.
[0011] Preferably, a thermometer is installed on the connecting pipeline between the second shell-and-tube heat exchanger and the screw air compressor.
[0012] The advantages of this invention are: based on the temperature of the lubricating oil after cooling, water cooling is used to reduce the number of maintenance operations; and in the case of rising circulating cold water temperature in summer, switching the circulating water to the fourth pipeline can effectively ensure the cooling effect of the lubricating oil and guarantee the normal operation of the screw air compressor. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model.
[0014] In the diagram: 1. Air filter, 2. Screw air compressor, 3. Oil separator, 4. First shell-and-tube heat exchanger, 5. Second shell-and-tube heat exchanger, 6. Cooling tower, 7. First water pump, 8. First pipeline, 9. Second pipeline, 10. Third pipeline, 11. Fourth pipeline, 12. Chiller unit, 13. Second water pump, 14. First regulating valve, 15. Second regulating valve, 16. Third regulating valve, 17. Fourth regulating valve, 18. Pressure gauge, 19. Thermometer. Detailed Implementation
[0015] like Figure 1 As shown, a screw air compressor lubricating oil cooling system includes an air filter 1, a screw air compressor 2, and an oil separator 3. The outlet of the air filter 1 is connected to the inlet of the screw air compressor 2, the exhaust of the screw air compressor 2 is connected to the inlet of the oil separator 3, the outlet of the oil separator 3 is connected to the inlet of a first shell-and-tube heat exchanger 4, and a first regulating valve 14 is installed between the oil separator 3 and the first shell-and-tube heat exchanger 4. The oil outlet of the oil separator 3 is connected to the oil inlet of a second shell-and-tube heat exchanger 5, and a second regulating valve 15 is installed between the oil separator 3 and the second shell-and-tube heat exchanger 5. The oil outlet of the second shell-and-tube heat exchanger 5 is connected to the oil inlet of the screw air compressor 2.
[0016] Dust and impurities in the air are removed by air filter 1. The filtered air enters the compression chamber of screw air compressor 2 and mixes with lubricating oil. After mixing, the air is compressed by the compressor to form a high-temperature compressed air and oil mixture. The high-temperature compressed air and oil mixture enters oil-gas separator 3 for gas-liquid separation. The separated high-temperature compressed air enters the first shell-and-tube heat exchanger 4 and circulating chilled water for heat exchange and cooling. The separated high-temperature lubricating oil enters the second shell-and-tube heat exchanger 5 and circulating chilled water for heat exchange and cooling. The cooled air is sent to the oxygen production system to produce oxygen or to the factory air pipeline network for use as factory air. The cooled lubricating oil is sent back to the screw air compressor for continued recycling.
[0017] The cooling tower 6 is connected to one end of the first pipeline 8 via the first water pump 7. A third regulating valve 16 is installed on the first pipeline 8. The other end of the first pipeline 8 is connected to the inlet of the second shell-and-tube heat exchanger 5. The outlet of the second shell-and-tube heat exchanger 5 is connected to the inlet of the first shell-and-tube heat exchanger 4 via the second pipeline 9. The outlet of the first shell-and-tube heat exchanger 4 is connected to the cooling tower 6 via the third pipeline 10. The cooling tower 6 provides circulating cold water to the first shell-and-tube heat exchanger 4 and the second shell-and-tube heat exchanger 5. Due to the high temperatures in summer, the temperature of the circulating chilled water rises. To ensure that the lubricating oil can be cooled down quickly, a thermometer 19 is installed on the connecting pipeline between the second shell-and-tube heat exchanger 5 and the screw air compressor 2 to monitor whether the temperature of the cooled lubricating oil is higher than the alarm set temperature. A pressure gauge 18 is installed on the first pipeline 8 to monitor whether the temperature of the cooled circulating water is higher than the alarm set temperature. A fourth pipeline 11 is connected in parallel to the first pipeline 8. A chiller unit 12 and a second water pump 13 are connected sequentially along the flow direction on the fourth pipeline 11. A fourth regulating valve 17 is installed on the fourth circulating water pipeline 11.
[0018] Chiller unit 12 is a water-cooled screw chiller. Chiller unit 12, the second water pump 13, the third regulating valve 16, the fourth regulating valve 17, and the thermometer 19 are electrically connected to the DCS control system. Automatic control logic is added to the DCS control system. In this automatic control logic, the third regulating valve 16 is set as follows: when the thermometer 19 detects that the lubricating oil temperature is higher than 50℃, the third regulating valve 16 closes, and the chiller unit 12, the second water pump 13, and the fourth regulating valve 17 open, allowing the chiller unit 12 to cool the circulating water. When the thermometer 19 detects that the lubricating oil temperature is lower than 30℃, the third regulating valve 16 reopens, the chiller unit 12 and the second water pump 13 start, and the fourth regulating valve 17 closes, thus ensuring that the lubricating oil temperature remains at approximately 40℃.
[0019] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A screw air compressor lubricating oil cooling system, comprising an air filter (1), a screw air compressor (2), and an oil separator (3); the outlet end of the air filter (1) is connected to the inlet end of the screw air compressor (2), and the exhaust end of the screw air compressor (2) is connected to the inlet end of the oil separator (3), characterized in that, The outlet of the oil separator (3) is connected to the inlet of the first shell-and-tube heat exchanger (4), the oil outlet of the oil separator (3) is connected to the inlet of the second shell-and-tube heat exchanger (5), the oil outlet of the second shell-and-tube heat exchanger (5) is connected to the inlet of the screw air compressor (2), the cooling tower (6) is connected to one end of the first pipeline (8) via the first water pump (7), and the other end of the first pipeline (8) is connected to the second shell-and-tube heat exchanger (5). The inlet of the second shell-and-tube heat exchanger (5) is connected to the outlet of the first shell-and-tube heat exchanger (4) through the second pipeline (9), and the outlet of the first shell-and-tube heat exchanger (4) is connected to the cooling tower (6) through the third pipeline (10); a fourth pipeline (11) is connected in parallel on the first pipeline (8), and a chiller unit (12) and a second water pump (13) are connected sequentially along the flow direction on the fourth pipeline (11).
2. The screw air compressor lubricating oil cooling system according to claim 1, characterized in that, A first regulating valve (14) is installed between the oil separator (3) and the first shell-and-tube heat exchanger (4).
3. The screw air compressor lubricating oil cooling system according to claim 1, characterized in that, A second regulating valve (15) is installed between the oil separator (3) and the second shell-and-tube heat exchanger (5).
4. The screw air compressor lubricating oil cooling system according to claim 1, characterized in that, A third regulating valve (16) and a pressure gauge (18) are installed on the first pipeline (8).
5. The screw air compressor lubricating oil cooling system according to claim 1, characterized in that, A fourth regulating valve (17) is installed on the fourth pipeline (11).
6. The screw air compressor lubricating oil cooling system according to claim 1, characterized in that, A thermometer (19) is installed on the connecting pipeline between the second shell-and-tube heat exchanger (5) and the screw air compressor (2).