Energy-saving thin oil lubricating device based on constant pressure control

Abstract

The utility model discloses an energy-saving thin oil lubrication device based on constant pressure control, which comprises an oil tank, a pumping device, a cooling system, an exhaust system, a pressure transmitter and a self-circulation loop, the pumping device comprises a variable speed motor, a hydraulic pump, a stop valve and an overflow valve, the output end of the variable speed motor is fixedly connected with the hydraulic pump, and the output end of the hydraulic pump is fixedly connected with the cooling system. The input end of the hydraulic pump is fixedly connected with the oil tank, the output end of the hydraulic pump is fixedly connected with the stop valve, the output end of the stop valve is fixedly connected with the cooling system, the output end of the cooling system is fixedly connected with the self-circulation loop, and a first debugging valve is arranged in the self-circulation loop. And the output end of the first debugging valve is fixedly connected with the oil tank. An existing displacement pump driven by a three-phase asynchronous motor is changed into a displacement pump driven by a variable speed motor-variable frequency or a servo motor, a variable pump is adopted, and the flow of a self-circulation loop does not need to be adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of thin oil lubrication, in particular to an energy-saving thin oil lubrication device based on constant pressure control. Background Art

[0002] The lubrication requirements of the friction pair of the oil film bearing determine that the thin oil lubrication system used for the oil film bearing must have the function of constant pressure control, that is, during the operation of the lubrication system, it must ensure that the pressure at the oil outlet of the thin oil lubrication device is stable.

[0003] As we all know, the pressure at the oil outlet of the thin oil lubrication device is actually the sum of the along-the-line and local pressure losses generated by the subsequent lubrication pipeline and nozzle. After the system pipeline is determined, the flow required by the friction pair is unstable due to changes in the equipment process conditions. To ensure the stability of the oil outlet pressure, the oil supply flow from the oil outlet to the friction pair must be changed. The general thin oil lubrication device uses a positive displacement pump. Since a three-phase asynchronous motor is used to drive the pump at a fixed speed, the flow at the pump outlet is constant, that is, a quantitative pump; if the oil supply flow from the oil outlet to the system is to be changed, a parallel pipeline must be set in front of the oil outlet to adjust the flow of the oil outlet. Because the pipeline takes into account both diversion and debugging, its liquid flows back to the oil tank, commonly known as a self-circulating loop.

[0004] To achieve the purpose of stable constant pressure control, the conventional constant pressure controlled thin oil lubrication device, in actual design, the maximum regulating flow of the self-circulating loop is generally 30% of the actual required flow, that is, about 25% of the nominal flow of the thin oil lubrication device as the regulating flow. In the actual working process, the minimum regulating flow is about 15% of the nominal flow, the maximum is about 25%, and the average regulating flow is 20%. The reason for choosing a larger regulating flow is actually to consider the stable working state of the regulating valve. All regulating flows are actually useless work and energy loss. Utility Model Content

[0005] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art and provide an energy-saving thin oil lubrication device based on constant pressure control, and its beneficial effects are as follows:

[0006] 1. The existing three-phase asynchronous motor driven positive displacement pump is changed into a variable speed motor - variable frequency or servo motor driven positive displacement pump, and a variable pump is used. The self-circulating loop does not need to adjust the flow, and when a variable frequency motor is used, energy saving is at least 20%; when a servo motor is used, energy saving is at least 30%. Compared with general devices, the one-time investment of the two is higher, and the operating cost is much lower

[0007] 2. In special cases, when the host traffic needs to be increased, overclocking control can be used to increase the traffic by about 15%.

[0008] 3. Simple principle and piping. On site, only the pressure needs to be set electrically according to the actual situation, and almost no mechanical debugging is required.

[0009] The utility model also provides an energy-saving thin oil lubrication device based on constant pressure control, comprising: an oil tank, a pumping device, a cooling system, an exhaust system, a pressure transmitter and a self-circulating loop, wherein the pumping device comprises a variable speed motor, a hydraulic pump, a stop valve and a relief valve, wherein the output end of the variable speed motor is fixedly connected to the hydraulic pump, the input end of the hydraulic pump is fixedly connected to the oil tank, the output end of the hydraulic pump is fixedly connected to the stop valve, the output end of the stop valve is fixedly connected to the cooling system, the output end of the cooling system is fixedly connected to the self-circulating loop, a first debugging valve is arranged in the self-circulating loop, the output end of the first debugging valve is fixedly connected to the oil tank, the output end of the cooling system is fixedly connected to the pressure transmitter, and the output end of the pressure transmitter is arranged with an oil outlet.

[0010] According to the energy-saving thin oil lubrication device based on constant pressure control, an oil return port and an oil drain port are arranged inside the oil tank, and the number of the oil drain ports is two.

[0011] According to the energy-saving thin oil lubrication device based on constant pressure control, the hydraulic pump is a positive displacement pump, and the variable speed motor is a variable frequency motor or a servo motor.

[0012] According to the energy-saving thin oil lubrication device based on constant pressure control, the input end of the overflow valve is fixedly connected to the oil tank, and the output end of the overflow valve is fixedly connected to the oil drain port.

[0013] According to the energy-saving thin oil lubrication device based on constant pressure control, the oil supply pipeline of the cooling system is provided with a water inlet and a water outlet.

[0014] According to the energy-saving thin oil lubrication device based on constant pressure control, the input end of the exhaust system is fixedly connected to the cooling system, and a pressure increasing / decreasing unit is provided inside the cooling system.

[0015] According to the energy-saving thin oil lubrication device based on constant pressure control, the oil supply pipeline of the exhaust system is provided with an air inlet and an exhaust port.

[0016] According to the energy-saving thin oil lubrication device based on constant pressure control, a pressure sensor and a temperature sensor are provided on the oil supply pipeline.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0019] Figure 1 This is a schematic diagram of an energy-saving thin oil lubrication device based on constant pressure control in the utility model;

[0020] Figure 2 It is a schematic diagram of an existing thin oil lubrication device based on constant pressure control of a self-operated regulating valve;

[0021] Figure 3 It is a schematic diagram of an existing thin oil lubrication device based on constant pressure control of a pneumatic diaphragm regulating valve;

[0022] Figure 4 The present invention is a schematic diagram of an existing thin oil lubrication device based on constant pressure control of an electric regulating valve.

[0023] Legend:

[0024] 1. Oil tank; 2. Variable speed motor; 3. Cooling system; 4. Exhaust system; 5. Pressure transmitter; 6. Self-circulating loop; 7. First debugging valve; 8. Hydraulic pump; 9. Stop valve; 10. Overflow valve; 11. Three-phase asynchronous motor; 12. Self-operated pressure regulating valve; 13. Second debugging valve; 14. Pneumatic diaphragm pressure regulating valve; 15. Electric pressure regulating valve; 16. Oil return port; 17. Oil drain port; 18. Water inlet; 19. Drain port; 20. Pressure increasing / reducing unit; 21. Air inlet; 22. Exhaust port; 23. Oil outlet. DETAILED DESCRIPTION

[0025] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0026] Reference Figure 1The utility model embodiment is an energy-saving thin oil lubrication device based on constant pressure control, which includes an oil tank 1, a pumping device, a cooling system 3, an exhaust system 4, a pressure transmitter 5 and a self-circulating loop 6. The oil tank 1 is provided with an oil return port 16 and an oil discharge port 17. The number of the oil discharge ports 17 is two. A pressure sensor and a temperature sensor are provided on the oil supply pipeline for monitoring and debugging the operation of the equipment. The pumping device includes a variable speed motor 2, a hydraulic pump 8, a stop valve 9 and a relief valve 10. The hydraulic pump 8 is a positive displacement pump. The variable speed motor 2 is a variable frequency motor or a servo motor. The output end of the variable speed motor 2 is fixedly connected to the hydraulic pump 8, the input end of the hydraulic pump 8 is fixedly connected to the oil tank 1, the output end of the hydraulic pump 8 is fixedly connected to the stop valve 9, the input end of the relief valve 10 is fixedly connected to the oil tank 1, and the output end of the relief valve 10 is fixedly connected with the oil discharge port 17. The oil discharge port 17 is connected to the oil return pipeline connected to the output end of the stop valve 9 to maintain the stability of the oil pressure output. The output end of the stop valve 9 is fixedly connected to the cooling system 3. The oil supply pipeline of the cooling system 3 is provided with a water inlet 18 and a drain outlet 19. The cooling system 3 can cool the oil in the oil supply pipeline to ensure the normal operation of the equipment.

[0027] The output end of the cooling system 3 is fixedly connected to the self-circulating loop 6, a first debugging valve 7 is arranged in the self-circulating loop 6, the output end of the first debugging valve 7 is fixedly connected to the oil tank 1, the output end of the cooling system 3 is fixedly connected to the pressure transmitter 5, the output end of the pressure transmitter 5 is arranged with an oil outlet 23, the existing three-phase asynchronous motor 11 driving the positive displacement pump is changed into a variable speed motor 2 - a variable frequency or servo motor driving the positive displacement pump; since the variable speed motor 2 is used to drive the positive displacement pump, the pump becomes a variable pump, and when the variable pump is used, the self-circulating loop 6 does not need to adjust the flow, that is, there is no energy consumption, and only the first debugging valve 7 is retained.

[0028] The input end of the exhaust system 4 is fixedly connected to the cooling system 3. A pressure increasing / decreasing unit 20 is arranged inside the cooling system 3. The oil supply pipeline of the exhaust system 4 is provided with an air inlet 21 and an exhaust port 22. The gas in the device is discharged through the exhaust system 4 to protect the normal operation of the device.

[0029] Comparative Example 1:

[0030] Reference Figure 2 , the existing principle diagram of the thin oil lubrication device based on the constant pressure control of the self-operated regulating valve is as follows. The principle is to set the self-operated pressure regulating valve 12 and the second debugging valve 13 in the self-circulating loop 6 to ensure the stability of the system pressure. The valve sets the pressure by its own spring, and self-balances the oil outlet pressure and the spring pressure through the internal channel, and does not need to adjust the valve opening by external force to achieve flow regulation. This principle belongs to self-operated closed-loop control. Since the self-operated pressure regulating valve 12 has an insurmountable valve stem friction, the adjustment sensitivity is 5-10%, so it is used in less important systems.

[0031] Comparative Example 2:

[0032] Reference Figure 3 , the existing thin oil lubrication device principle diagram based on constant pressure control of pneumatic diaphragm regulating valve, the principle is to set pneumatic diaphragm pressure regulating valve 14 and second debugging valve 13 in self-circulating loop 6 to ensure the stability of system pressure. The valve is based on the value set by pressure transmitter 5 of oil outlet 23, and controls the air source pressure through PID integral regulator to change the valve opening to adjust the flow. This principle belongs to external force closed-loop control, with fast control speed and high precision, but sometimes it is difficult to ensure speed and precision due to the influence of air source pressure.

[0033] Comparative Example 3:

[0034] Reference Figure 4 The existing principle of the thin oil lubrication device based on the constant pressure control of the electric regulating valve is to set the electric pressure regulating valve 15 and the second debugging valve 13 in the self-circulating loop 6 to ensure the stability of the system pressure. The valve is based on the value set by the pressure transmitter 5 of the oil outlet 23, and controls the number of revolutions of the three-phase asynchronous motor 11 through the PID integral regulator to change the valve opening to adjust the flow. This principle belongs to the external force closed-loop control, with fast control speed and high precision, but the only disadvantage is that an additional power supply must be connected on site.

[0035] Working principle: The variable speed motor 2 is based on the value set by the pressure transmitter 5 of the oil outlet 23, and controls the speed of the variable speed motor 2 through the PID integral regulator to change the flow of the oil outlet 23, so as to achieve constant pressure at the oil outlet 23.

[0036] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. An energy-saving thin oil lubrication device based on constant pressure control, characterized in that: include: An oil tank (1), a pumping device, a cooling system (3), an exhaust system (4), a pressure transmitter (5) and a self-circulating loop (6); the pumping device comprises a variable speed motor (2), a hydraulic pump (8), a stop valve (9) and a relief valve (10); the output end of the variable speed motor (2) is fixedly connected to the hydraulic pump (8); the input end of the hydraulic pump (8) is fixedly connected to the oil tank (1); the output end of the hydraulic pump (8) is fixedly connected to the stop valve (9); the output end of the stop valve (9) is fixedly connected to the cooling system (3); the output end of the cooling system (3) is fixedly connected to the self-circulating loop (6); a first debugging valve (7) is provided in the self-circulating loop (6); the output end of the first debugging valve (7) is fixedly connected to the oil tank (1); the output end of the cooling system (3) is fixedly connected to the pressure transmitter (5); and the output end of the pressure transmitter (5) is provided with an oil outlet (23).

2. The energy-saving thin oil lubrication device based on constant pressure control according to claim 1 is characterized in that: An oil return port (16) and an oil discharge port (17) are provided inside the oil tank (1), and the number of the oil discharge ports (17) is two.

3. The energy-saving thin oil lubrication device based on constant pressure control according to claim 1 is characterized in that: The hydraulic pump (8) is a positive displacement pump, and the variable speed motor (2) is a variable frequency motor or a servo motor.

4. The energy-saving thin oil lubrication device based on constant pressure control according to claim 1 is characterized in that: The input end of the overflow valve (10) is fixedly connected to the oil tank (1), and the output end of the overflow valve (10) is fixedly connected to an oil discharge port (17).

5. The energy-saving thin oil lubrication device based on constant pressure control according to claim 1 is characterized in that: The oil supply pipeline of the cooling system (3) is provided with a water inlet (18) and a water outlet (19).

6. The energy-saving thin oil lubrication device based on constant pressure control according to claim 1 is characterized in that: The input end of the exhaust system (4) is fixedly connected to the cooling system (3), and a pressure increasing / decreasing unit (20) is provided inside the cooling system (3).

7. The energy-saving thin oil lubrication device based on constant pressure control according to claim 1 is characterized in that: The oil supply pipeline of the exhaust system (4) is provided with an air inlet (21) and an exhaust port (22).

8. The energy-saving thin oil lubrication device based on constant pressure control according to claim 1 is characterized in that: The oil supply pipeline is provided with a pressure sensor and a temperature sensor.

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