Energy-saving temperature control device for lubricating oil

Abstract

The utility model relates to petroleum drilling equipment production technical field, concretely relates to a lubricating oil energy -conserving temperature control device, including PLC and with the oil -gas separator, oil heater, lubricating oil air cooler, frequency conversion motor, automatic louver, temperature transmitter, lubricating oil filter and frequency changer of PLC connection, the oil -gas separator entrance end is connected with screw compressor, and the export is connected with lubricating oil filter through the range pipeline no.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling equipment manufacturing technology, and specifically to a lubricating oil energy-saving temperature control device. Background Technology

[0002] Screw compressors boast advantages such as high efficiency, low noise, high reliability, stability, and simple maintenance. Their market size and market share are continuously expanding, and they are widely used in coalbed methane extraction, wellhead gas enhancement, associated gas recovery, and pipeline gas gathering and pressurization. The lubrication system, as the core of the oil-injected screw compressor, directly impacts the lifespan and efficiency of the main unit.

[0003] Traditional lubrication systems primarily use an oil pump to draw lubricating oil from an oil-gas separator, pressurize it, and then deliver the oil to the compressor's lubrication points after passing through an air cooler, temperature control valve, and filter. However, in cold winter operating conditions, especially in regions with significant temperature differences between winter and summer (winter temperatures can reach -40°C to -50°C, and summer temperatures can exceed 40°C), traditional air coolers equipped with fixed-frequency motors can only be manually adjusted via louvers. Furthermore, achieving the target temperature accurately through manual adjustment is difficult. If excessive cooling occurs, changes in lubricating oil viscosity can significantly impact the compressor's lifespan and efficiency. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and propose a lubricating oil energy-saving temperature control device. It adopts an air cooler fan with an automatically controlled variable frequency motor and automatically controls the louvers through PLC to achieve precise temperature control and adjustment under different temperature difference conditions such as high temperature and low temperature.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A lubricating oil energy-saving temperature control device includes a PLC control system and an oil-gas separator, an oil heater, a lubricating oil pump, a lubricating oil air cooler, a variable frequency motor, an automatic louver, a temperature transmitter, a temperature control valve, a lubricating oil filter, and a variable frequency drive connected to the PLC control system. The inlet end of the oil-gas separator is connected to the screw compressor, and the outlet end is connected to the lubricating oil filter via a first-stage branch line. The lubricating oil filter is connected to the screw compressor. A lubricating oil pump and a temperature control valve are sequentially installed along the lubricating oil flow direction on the first-stage branch line. The lubricating oil air cooler is installed on a second-stage branch line. One end of the second-stage branch line is connected to the first-stage branch line, and the other end is connected to the temperature control valve. The connection point between the first-stage branch line and the second-stage branch line is located between the lubricating oil pump and the temperature control valve. The oil heater is located at the bottom of the oil-gas separator. The temperature transmitter is located on the second-stage branch line and is located between the lubricating oil air cooler and the temperature control valve. The variable frequency motor is connected to the fan of the lubricating oil air cooler. The variable frequency drive is connected to the variable frequency motor. The automatic louvers are located on one side of the lubricating oil air cooler.

[0006] Furthermore, a thermal insulation layer is provided on the branch pipeline, and the thermal insulation layer is located between the lubricating oil pump and the temperature control valve.

[0007] Furthermore, the connection point between one end of the second branch line and the first branch line is located between the lubricating oil pump and the thermal insulation layer.

[0008] Furthermore, the second branch line is equipped with heat insulation layers on both the front and rear sides of the lubricating oil air cooler.

[0009] Furthermore, the oil-gas separator is used to separate process gas and lubricating oil, with the lubricating oil stored at the bottom of the oil-gas separator; the oil heater is used to heat the lubricating oil in the oil-gas separator; the lubricating oil pump is used to draw lubricating oil from the oil-gas separator and pressurize it; the lubricating oil air cooler is used to cool the high-temperature lubricating oil after pressurization by the lubricating oil pump in a timely manner; the variable frequency motor is used to drive the lubricating oil air cooler fan, and the speed can be controlled by the variable frequency to adjust the air volume; the automatic louvers are controlled by the PLC control system to adjust the opening degree and adjust the air volume; the temperature transmitter is used to monitor the temperature of the lubricating oil after cooling; the temperature control valve is used to control the lubricating oil outflow temperature to be constant; the lubricating oil filter is used to filter the lubricating oil; the thermal insulation layer is used to keep the lubricating oil warm; and the frequency converter is used to change the motor frequency.

[0010] Technical effects of this utility model: Compared with the prior art, the present invention provides a lubricating oil energy-saving temperature control device, which uses a variable frequency motor to drive the air cooler fan and the louvers can automatically adjust their opening. By monitoring the lubricating oil system temperature in real time, the PLC control system can make corresponding action signals according to different temperatures, achieving more energy-saving, precise, safe and reliable temperature control, effectively improving the life and efficiency of the main unit, and is particularly suitable for oil-injected screw compressor units in areas with large temperature differences between winter and summer. Attached Figure Description

[0011] Figure 1This is a structural block diagram of the lubricating oil energy-saving temperature control device of this utility model.

[0012] In the diagram, 1. Oil-gas separator; 2. Oil heater; 3. Lubricating oil pump; 4. Lubricating oil air cooler; 5. Variable frequency motor; 6. Automatic louver; 7. Temperature transmitter; 8. Temperature control valve; 9. Lubricating oil filter; 10. Thermal insulation layer; 11. Variable frequency drive; 12. Branch line one; 13. Branch line two; 14. Screw compressor. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0014] Example 1: like Figure 1 As shown, this embodiment relates to an energy-saving temperature control device for lubricating oil, which includes an oil-gas separator 1, an oil heater 2, a lubricating oil pump 3, a lubricating oil air cooler 4, a variable frequency motor 5, an automatic louver 6, a temperature transmitter 7, a temperature control valve 8, a lubricating oil filter 9, a thermal insulation layer 10, and a frequency converter 11.

[0015] The inlet end of the oil-gas separator 1 is connected to the screw compressor 14, and the outlet end is connected to the lubricating oil filter 9 via a first-stage branch line 12. The lubricating oil filter 9 is also connected to the screw compressor 14. A lubricating oil pump 3, a thermal insulation layer 10, and a temperature control valve 8 are sequentially installed along the lubricating oil flow direction on the first-stage branch line 12. The lubricating oil air cooler 4 is installed on a second-stage branch line 13, one end of which is connected to the first-stage branch line 12, and the other end is connected to the temperature control valve 8. The second-stage branch line 13 is connected to the first-stage branch line 12. The connection point is located between the lubricating oil pump 3 and the thermal insulation layer 10. Thermal insulation layers 10 are provided on both the front and rear sides of the lubricating oil air cooler 4 on the second branch line 13. The oil heater 2 is located at the bottom of the oil-gas separator 1. The temperature transmitter 7 is located on the second branch line 13, between the lubricating oil air cooler 4 and the temperature control valve 8. The variable frequency motor 5 is connected to the fan of the lubricating oil air cooler 4. The variable frequency drive 11 is connected to the variable frequency motor 5. The automatic louver 6 is located on one side of the lubricating oil air cooler 4. The oil-gas separator 1, oil heater 2, lubricating oil pump 3, lubricating oil air cooler 4, variable frequency motor 5, automatic louver 6, temperature transmitter 7, temperature control valve 8, lubricating oil filter 9, and variable frequency drive 11 are all connected to the PLC control system and are automatically controlled by the PLC control system.

[0016] The oil-gas separator 1 separates process gas and lubricating oil, and the bottom can store the separated lubricating oil. The screw compressor 14 mixes and pressurizes lubricating oil and process gas together before discharging it into the oil-gas separator 1; The oil heater 2 is used to heat the lubricating oil in the oil-gas separator 1; The lubricating oil pump 3 is used to draw lubricating oil from the oil-gas separator 1 and pressurize it; The lubricating oil air cooler 4 is used to cool the high-temperature lubricating oil after it is pressurized by the lubricating oil pump 3 in a timely manner. The variable frequency motor 5 is used to drive the fan of the lubricating oil air cooler 4, and the speed can be controlled by the variable frequency to adjust the air volume. The automatic louver 6 is controlled by a PLC control system to adjust the opening degree and air volume. The temperature transmitter 7 is used to monitor the temperature of the lubricating oil after cooling, and to provide the PLC control system with the raw data of the action. The temperature control valve 8 is used to ensure that the lubricating oil outflow temperature is constant; The lubricating oil filter 9 ensures the cleanliness of the lubricating oil; The thermal insulation layer 10 is used for heat preservation of lubricating oil.

[0017] The frequency converter 11 is used to change the frequency of the motor.

[0018] The lubricating oil pipeline of this utility model, after exiting the oil outlet of the oil-gas separator 1, is pressurized by the lubricating oil pump 3 and then divided into two stages. When the unit is first started, the oil temperature is low, and the lubricating oil flows in through port B of the temperature control valve 8 and flows out through port A, entering the lubricating oil filter 9. As the unit operates and the oil temperature rises, the lubricating oil can no longer flow in through port B and out through port A of the temperature control valve 8. It will then enter the lubricating oil air cooler 4 through another pipeline. After entering the lubricating oil air cooler 4, a temperature transmitter 7 is installed to detect the temperature. After cooling, it flows in through port C of the temperature control valve 8 and out through port A, entering the lubricating oil filter 9, and then enters the screw compressor 14 to provide lubrication for bearings, rotors, etc. Finally, the lubricating oil is mixed with process gas, pressurized, and discharged into the oil-gas separator 1. The temperature transmitter 7 after the lubricating oil air cooler 4 is mainly used to monitor the temperature of the lubricating oil after cooling in real time. For example, if the system requires the cooled temperature to be ≤55℃, a high-temperature alarm signal H is triggered when the temperature is ≥58℃, and a high-temperature shutdown signal HH is triggered when the temperature is ≥60℃. In the above situations, the variable frequency motor 5 of the lubricating oil air cooler 4 runs at full speed. When the temperature transmitter 7 temperature is ≤40℃, the frequency converter 11 is triggered to reduce the frequency by 2Hz in a single, slow reduction. After 2 minutes, the system checks the temperature transmitter 7 temperature. If it is still ≤40℃, this action is repeated. If the frequency converter 11 reduces the frequency to 25H... If the temperature remains ≤40℃, the frequency converter 11 will no longer reduce its frequency. At this time, the closing signal of the automatic louver 6 actuator is triggered, and the louver 6 slowly closes by 2% at a time. Two minutes after the action ends, the system checks the temperature transmitter 7. This process is repeated until the automatic louver 6 is completely closed. If the temperature is still ≤40℃, the frequency converter motor M-101 is turned off, and the automatic louver 6 is closed. If the temperature transmitter 7 still shows a temperature ≤40℃, the oil heater 2 on the oil-gas separator 1 is turned on to heat the lubricating oil in the oil-gas separator 1. If the temperature transmitter 7 shows a temperature ≤20℃, the unit is immediately shut down. Below 20℃, the lubricating oil viscosity is high, resulting in poor lubrication of the main bearings and rotor, making it unsuitable for long-term operation. It should be noted that the control program and method of the PLC control system and the structure of the automatic louver 6 are based on existing technology, and will not be described in detail in this utility model.

[0019] This invention achieves more energy-efficient, precise, safe, and reliable temperature control by real-time monitoring of the lubricating oil system temperature and the PLC control system issuing corresponding action signals based on different temperatures, effectively improving the lifespan and efficiency of the host machine.

[0020] The above-described specific embodiments are merely specific examples of this utility model. The patent protection scope of this utility model includes, but is not limited to, the above-described specific embodiments. Any appropriate changes or modifications made by a person skilled in the art that conform to the claims of this utility model should fall within the patent protection scope of this utility model.

Claims

1. A lubricating oil energy-saving temperature control device, characterized in that, Includes a PLC control system and an oil-gas separator, oil heater, lubricating oil pump, lubricating oil air cooler, variable frequency motor, automatic louver, temperature transmitter, temperature control valve, lubricating oil filter, and frequency converter connected to the PLC control system; The inlet end of the oil-gas separator is connected to the screw compressor, and the outlet end is connected to the lubricating oil filter via a first-stage branch line. The lubricating oil filter is connected to the screw compressor. A lubricating oil pump and a temperature control valve are sequentially installed along the lubricating oil flow direction on the first-stage branch line. The lubricating oil air cooler is installed on a second-stage branch line. One end of the second-stage branch line is connected to the first-stage branch line, and the other end is connected to the temperature control valve. The connection point between the first-stage branch line and the second-stage branch line is located between the lubricating oil pump and the temperature control valve. The oil heater is located at the bottom of the oil-gas separator. The temperature transmitter is located on the second-stage branch line and is located between the lubricating oil air cooler and the temperature control valve. The variable frequency motor is connected to the fan of the lubricating oil air cooler. The variable frequency drive is connected to the variable frequency motor. The automatic louvers are located on one side of the lubricating oil air cooler.

2. The lubricating oil energy-saving temperature control device according to claim 1, characterized in that, A thermal insulation layer is installed on the branch pipeline, and the thermal insulation layer is located between the lubricating oil pump and the temperature control valve.

3. The lubricating oil energy-saving temperature control device according to claim 2, characterized in that, The connection point between one end of the second branch line and the first branch line is located between the lubricating oil pump and the thermal insulation layer.

4. The lubricating oil energy-saving temperature control device according to claim 1, characterized in that, The second branch line is equipped with heat insulation layers on both the front and rear sides of the lubricating oil air cooler.

5. The lubricating oil energy-saving temperature control device according to claim 1, characterized in that, The oil-gas separator is used to separate process gas and lubricating oil, with the lubricating oil stored at the bottom of the oil-gas separator; the oil heater is used to heat the lubricating oil in the oil-gas separator; the lubricating oil pump is used to draw lubricating oil from the oil-gas separator and pressurize it; the lubricating oil air cooler is used to cool the high-temperature lubricating oil after pressurization by the lubricating oil pump in a timely manner; and the variable frequency motor is used to drive the fan of the lubricating oil air cooler. The automatic louvers are controlled by a PLC control system to adjust the opening degree and air volume; the temperature transmitter is used to monitor the temperature of the lubricating oil after cooling; the temperature control valve is used to control the lubricating oil outflow temperature to be constant; the lubricating oil filter is used to filter the lubricating oil; the thermal insulation layer is used to keep the lubricating oil warm; and the frequency converter is used to change the motor frequency.

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