An intelligent multi-channel lubricating oil station for pumps

Abstract

An intelligent multi-channel lubricating oil station for pumps includes an oil tank, a filter device, a high-temperature accumulator, a lubricating oil inlet and outlet, a junction box, a lubricating oil filling port, a lubricating oil channel, a lubricating oil pressure regulating valve, a pressure sensor, a heat exchanger, an external circulation cooling water, a temperature sensor, an oil supply circuit, an oil return circuit, a bypass oil return circuit, a booster pump, an oil tank on-off valve, and a cooling water pressure regulating valve. The present invention can control the temperature of the lubricating oil by increasing the temperature of the pump work and cooling the lubricating oil through the external circulation cooling water, so that the lubricating oil temperature is always at the optimal lubrication temperature required by the pump device, eliminating the influence on the use effect of the pump device, avoiding the situation that may cause damage, and can meet the requirements of different pressure lubricating oil supply at different positions of the pump device, and can effectively ensure the stability of the output pressure, eliminate the phenomenon of oil pressure fluctuation or pressure pulse, simple structure, low cost, can meet the control of different pressures in multiple channels and the influence of pressure changes.

Description

Technical Field

[0001] The invention relates to a lubricating oil station for a pump, in particular to an intelligent multi-channel lubricating oil station for a pump. Background Art

[0002] During the use of pump devices, lubricating oil is widely used as a protective liquid to reduce wear. Existing small lubricating oil stations mainly use a booster pump directly connected to the oil tank, a single-channel constant pressure output mode, or add a pressure regulating valve at the outlet to adjust the pressure. This type of lubricating oil station has a simple structure and a small size, but it has simple functions and many problems: 1. It is impossible to control the temperature so that the lubricating oil is at the optimal lubrication temperature of the pump device, and the temperature will gradually increase with the use time, which will cause damage to the pump in severe cases; 2. Single-channel oil supply or multi-channel single pressure cannot meet the requirements of lubricating oil supply at different pressures in different positions of the pump device; 3. When dealing with pump devices with more complex working conditions, if the speed, oil suction or pressure increase or decrease during the operation of the pump equipment, it may cause a sudden change in the lubricating oil pressure in the pump cavity, which will affect the use effect of the pump equipment, and in severe cases, it may cause damage to the pump equipment; 4. The pressure is a constant output, and the pressure cannot be accurately controlled in real time. In large oil station equipment, the output pressure is often controlled by a frequency converter to control the booster pump, and water cooling equipment is installed to cool the oil source. However, this method is too complex in structure and expensive, and it is also unable to meet the control of different pressures in multiple channels and the impact of pressure changes, and the water temperature cannot be kept constant.

[0003] In order to solve the above-mentioned problems, it is necessary to design a compact intelligent controlled lubricating oil station including multi-channel adjustable pressure independent oil outlets, a filtering device, an energy storage device, and a temperature control device. Summary of the invention

[0004] According to the above technical problems, the present invention provides an intelligent multi-channel lubricating oil station for pumps, including an oil tank, a filtering device, a high-temperature accumulator, a lubricating oil inlet and outlet, a junction box, a lubricating oil filling port, a lubricating oil passage, a lubricating oil pressure regulating valve, a pressure sensor, a heat exchanger, an external circulation cooling water, a temperature sensor, an oil supply passage, an oil return passage, a bypass oil return passage, a booster pump, an oil tank on-off valve, and a cooling water pressure regulating valve. The top of the oil tank is provided with a lubricating oil filling port, the lubricating oil filling port is provided with a temperature sensor, and the side of the oil tank is provided with a lubricating oil inlet and outlet, and the lubricating oil inlet and outlet include 2 lubricating oil outlets and 2 lubricating oil inlets;

[0005] The oil tank is connected to the booster pump through a lubricating oil passage, and an oil tank on-off valve is installed on the lubricating oil passage between the oil tank and the booster pump. A filter device and a high-temperature accumulator are arranged in sequence on the lubricating oil passage at the rear end of the booster pump. The lubricating oil passage at the rear end of the high-temperature accumulator is divided into three branches, two of which are independent oil supply passages, and the other branch is a bypass oil return passage. A lubricating oil pressure regulating valve and a pressure sensor are arranged in sequence on each oil supply passage. The oil supply passage is connected to a pump device outside the lubricating oil station through a lubricating oil outlet in the lubricating oil inlet and outlet. An oil supply valve is arranged at the connection between the oil supply passage and the pump device, and the bypass oil return passage is connected to the oil tank;

[0006] The lubricating oil inlet in the lubricating oil inlet and outlet is connected to two independent oil return lines outside the lubricating oil station. The oil return line is connected to one side of the heat exchanger after entering the lubricating oil station. The other side of the heat exchanger is connected to the external circulation cooling water through a pipeline. A cooling water pressure regulating valve is provided on the pipeline between the heat exchanger and the external circulation cooling water.

[0007] A junction box is provided on the top of the oil tank, through which all external power supply lines and signal lines are connected;

[0008] The whole equipment is controlled by the control system.

[0009] Furthermore, the filtering device is a lubricating oil filter.

[0010] Furthermore, the control system is a PLC control system, which collects output pressure through a pressure sensor, and the signal is fed back through an external junction box. At the same time, the control signal is output to the lubricating oil pressure regulating valve through the junction box, thereby completing PID control.

[0011] The beneficial effects of the present invention are:

[0012] 1. When the lubricating oil station is initially working, if the measured temperature is lower than the optimal working temperature (temperature setting value) of the pump device, close the oil supply valve at the connection between the oil supply line and the pump device, and the lubricating oil returns to the oil tank through the booster pump and the bypass oil return line for circulation. The temperature is raised by the booster pump before entering the pump device. If the lubricating oil temperature is too high, the external circulating cooling water is input through the heat exchange station to cool it down before entering the pump device, thereby realizing the control of the lubricating oil temperature so that it is always at the optimal lubrication temperature required by the pump device, eliminating the impact on the use effect of the pump device and avoiding the situation that may cause damage;

[0013] 2. By setting up independent dual oil supply lines, the pressure on each oil supply line can be adjusted separately. The pressures on each oil supply line do not affect each other, which can meet the requirements of different pressure lubricating oil supply at different positions of pump devices;

[0014] 3. By setting up a high-temperature accumulator, the sudden change of lubricating oil pressure in the pump cavity can be avoided, which may affect the use of pump devices or even damage them. It can effectively ensure the stable output pressure and eliminate the phenomenon of oil pressure fluctuation or pressure pulse.

[0015] 4. The lubricating oil is cooled by external circulating cooling water, and a cooling water pressure regulating valve is set at the inlet of the external circulating cooling water. The temperature sensor collects the temperature of the lubricating oil in the oil tank. The opening of the cooling water pressure regulating valve at the inlet of the external circulating cooling water is controlled to control the cooling water inlet amount, thereby completing the PID control of the lubricating oil temperature. It has a simple structure and low cost, and can meet the control of different pressures in multiple channels and the impact of pressure changes, while keeping the water temperature constant. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the main structure diagram of the present invention;

[0017] Figure 2 It is the principle diagram of the present invention;

[0018] Figure 3 It is the pressure and temperature control flow chart of the present invention.

[0019] As shown in the figure, oil tank-1, filter device-2, high temperature accumulator-3, lubricating oil inlet and outlet-4, junction box-5, lubricating oil filling port-6, lubricating oil passage-7, lubricating oil pressure regulating valve-8, pressure sensor-9, heat exchanger-10, external circulation cooling water-11, temperature sensor-12, oil supply line-13, oil return line-14, bypass oil return line-15, booster pump-16, oil tank on-off valve-17, cooling water pressure regulating valve-18. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings: The present invention is an intelligent multi-channel lubricating oil station for pumps, comprising an oil tank 1, a filter device 2, a high-temperature accumulator 3, a lubricating oil inlet and outlet 4, a junction box 5, a lubricating oil filling port 6, a lubricating oil passage 7, a lubricating oil pressure regulating valve 8, a pressure sensor 9, a heat exchanger 10, an external circulation cooling water 11, a temperature sensor 12, an oil supply circuit 13, an oil return circuit 14, a bypass oil return circuit 15, a booster pump 16, an oil tank on-off valve 17, and a cooling water pressure regulating valve 18. The top of the oil tank 1 is provided with a lubricating oil filling port 6, and the lubricating oil filling port 6 is provided with a temperature sensor 12 for monitoring the temperature of the lubricating oil in the oil tank 1. The side of the oil tank 1 is provided with a lubricating oil inlet and outlet 4, and the lubricating oil inlet and outlet 4 includes 2 lubricating oil outlets and 2 lubricating oil inlets;

[0021] The oil tank 1 is connected to the boosting pump 16 through the lubricating oil passage 7. The lubricating oil passage 7 between the oil tank 1 and the boosting pump 16 is provided with an oil tank on-off valve 17. The lubricating oil passage at the rear end of the boosting pump 16 is provided with a filter device 2 and a high-temperature accumulator 3 in sequence. The filter device 2 contains a filter element, and the corresponding filter element can be selected according to the cleanliness requirements of the lubricating oil or the use of the pump device. The lubricating oil passage at the rear end of the high-temperature accumulator 3 is divided into three branches, two of which are independent oil supply passages 13, and the other branch is a bypass oil return passage 15. Each oil supply passage 13 is provided with a lubricating oil pressure regulating valve 8 and a pressure sensor 9 in sequence. The oil supply passage 13 is connected to the pump device outside the lubricating oil station through the lubricating oil outlet in the lubricating oil inlet and outlet 4. The oil supply valve is provided at the connection between the oil supply passage 13 and the pump device, and the bypass oil return passage 15 is connected to the oil tank 1;

[0022] The lubricating oil inlet in the lubricating oil inlet and outlet 4 is connected to two independent oil return lines 14 outside the lubricating oil station. The oil return line 14 is connected to one side of the heat exchanger 10 after entering the lubricating oil station. The other side of the heat exchanger 10 is connected to the external circulating cooling water 11 through a pipeline. A cooling water pressure regulating valve 18 is provided on the pipeline between the heat exchanger 10 and the external circulating cooling water 11.

[0023] A junction box 5 is provided on the top of the oil tank 1, through which all external power supply lines and signal lines are connected;

[0024] The whole equipment is controlled by the control system. The output pressure is collected by the pressure sensor 9, and the signal is fed back through the external junction box 5. At the same time, the control signal is output to the lubricating oil pressure regulating valve 8 through the junction box 5, thereby completing PID control.

[0025] Furthermore, the filtering device 2 is a lubricating oil filter.

[0026] Furthermore, the control system is a PLC control system.

[0027] Working principle: First, add lubricating oil into the oil tank 1 through the lubricating oil filling port 6. The temperature sensor 12 arranged thereon is used to monitor the temperature of the lubricating oil in the oil tank 1. The oil tank 1 is connected to the booster pump 16 through the mailbox on-off valve 17;

[0028] The filter device 2 is located at the rear end of the boost pump 16 to ensure the fuel cleanliness of the lubricating oil. A high-temperature accumulator 3 is arranged behind the filter device. If the speed, oil suction or pressure suddenly increases or decreases during the operation of the pump device, the lubricating oil pressure in the pump cavity may suddenly change, which may affect the use effect of the pump equipment. In severe cases, the pump equipment may be damaged. The high-temperature accumulator 3 avoids the above-mentioned adverse effects, effectively ensures the stable output pressure, and eliminates the phenomenon of oil pressure fluctuation or pressure pulse;

[0029] The lubricating oil passage after the high temperature accumulator 3 includes two oil supply passages 13 and a bypass oil return passage 15. A lubricating oil pressure regulating valve 8 and a pressure sensor 9 at its rear are arranged in the oil supply passage 13. The oil supply pressure of the oil supply passage 13 can be controlled by adjusting the opening of the lubricating oil pressure regulating valve 8. At the same time, the remaining lubricating oil flows back to the oil tank 1 through the bypass oil return passage 15. This method can ensure that the booster pump 16 does not work at high load for a long time, and effectively ensures that the pressures of the two oil supply passages 13 do not interfere with each other, and can be controlled independently;

[0030] The oil supply line 13 and the oil return line 14 are connected to the pump device through the lubricating oil inlet and outlet 4 outside the lubricating oil station. After entering the lubricating oil station, the oil return line 14 is connected to the heat exchanger 10. The other side of the heat exchanger 10 inputs the external circulation cooling water 11 for cooling. At the same time, a cooling water pressure regulating valve 18 is set in the external circulation cooling water input line. In the temperature control process, the water inflow of the external circulation cooling water 11 is controlled by adjusting the opening of the cooling water pressure regulating valve 18, thereby controlling the cooling rate to control the temperature of the lubricating oil;

[0031] In order to enable the pump device to obtain the best lubricating oil pressure and lubricating oil temperature during operation, the main process of oil pressure and temperature control in the present invention is as follows:

[0032] 1. After the system self-checks and confirms that the work has started, the temperature of the temperature sensor 12 is called and compared with the input required temperature;

[0033] 2. When the temperature input value is less than the temperature measurement value, close the oil supply valve and start the booster pump 16, so that the lubricating oil passage 7 is pressurized by the booster pump 16 and returns to the oil tank 1 through the bypass oil return passage 15 for circulation, and the booster pump 16 works to increase the lubricating oil temperature until it is close to the temperature input value;

[0034] 3. When the temperature input value is close to or greater than the temperature measurement value, slowly open the oil supply valve, call the pressure measurement value and pressure input value at the oil supply port on the oil supply line 13, and adjust the opening of the lubricating oil pressure regulating valve to control the pressure until it meets the pressure input value. At the same time, call the temperature measurement value and temperature input value, and adjust the opening of the cooling water pressure regulating valve 18 at the inlet of the external circulation cooling water to control the water inlet of the external circulation cooling water 11 in the heat exchanger 10, thereby controlling the cooling rate. Until it meets the temperature input value.

[0035] The main algorithm of PID control process is as follows:

[0036] 1. Pressure PID control algorithm

[0037] N(k)=N(k-1)+kp*(eP(k)-eP(k-1))+ki*eP(k)+kd(eP(k)-2*eP(k-1)+eP(k-2))

[0038] Where:

[0039] N(k) is the kth adjustment signal value, N(k-1) is the (k-1)th signal adjustment value;

[0040] eP(k)—the difference between the kth pressure sampling value and the set value, eP(k)=ui(k)-ur.

[0041] eP(k-1) is the difference between the k-1th pressure sampling value and the set value, eP(k-1)=ui(k-1)-ur.

[0042] eP(k-2) is the difference between the k-2th pressure sampling value and the set value, eP(k-2)=ui(k-2)-ur;

[0043] kP—proportional adjustment coefficient;

[0044] ki—integral adjustment coefficient;

[0045] kd—differential adjustment coefficient;

[0046] 2. Temperature PID control algorithm

[0047] N(k)=N(k-1)+kp*(eT(k)-eT(k-1))+ki*eT(k)+kd(eT(k)-2*eT(k-1)+eT(k-2))

[0048] Where:

[0049] N(k) is the kth adjustment signal value, N(k-1) is the (k-1)th signal adjustment value;

[0050] eT(k)—the difference between the kth temperature sampling value and the set value, eT(k)=ui(k)-ur.

[0051] eT(k-1) is the difference between the k-1th temperature sampling value and the set value, eT(k-1)=ui(k-1)-ur.

[0052] eT(k-2) is the difference between the k-2th temperature sampling value and the set value, eT(k-2) = ui(k-2) - ur;

[0053] kP—proportional adjustment coefficient;

[0054] ki—integral adjustment coefficient;

[0055] kd—differential adjustment coefficient;

[0056] The above description is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements can be made without departing from the principle of the present invention, and these improvements should also be regarded as the scope of protection of the present invention.

Claims

1. An intelligent multi-channel lubricating oil station for pumps, characterized in that: It includes an oil tank, a filter device, a high-temperature accumulator, a lubricating oil inlet and outlet, a junction box, a lubricating oil filling port, a lubricating oil passage, a lubricating oil pressure regulating valve, a pressure sensor, a heat exchanger, an external circulation cooling water, a temperature sensor, an oil supply passage, an oil return passage, a bypass oil return passage, a booster pump, an oil tank on-off valve, and a cooling water pressure regulating valve. The top of the oil tank is provided with a lubricating oil filling port, the lubricating oil filling port is provided with a temperature sensor, and the side of the oil tank is provided with a lubricating oil inlet and outlet, and the lubricating oil inlet and outlet further include 2 lubricating oil outlets and 2 lubricating oil inlets; The oil tank is connected to the booster pump through a lubricating oil passage, and an oil tank on-off valve is installed on the lubricating oil passage between the oil tank and the booster pump. A filter device and a high-temperature accumulator are arranged in sequence on the lubricating oil passage at the rear end of the booster pump. The lubricating oil passage at the rear end of the high-temperature accumulator is divided into three branches, two of which are independent oil supply passages, and the other branch is a bypass oil return passage. A lubricating oil pressure regulating valve and a pressure sensor are arranged in sequence on each oil supply passage. The oil supply passage is connected to a pump device outside the lubricating oil station through a lubricating oil outlet in the lubricating oil inlet and outlet. An oil supply valve is arranged at the connection between the oil supply passage and the pump device, and the bypass oil return passage is connected to the oil tank; The lubricating oil inlet in the lubricating oil inlet and outlet is connected to two independent oil return lines outside the lubricating oil station. The oil return line is connected to one side of the heat exchanger after entering the lubricating oil station. The other side of the heat exchanger is connected to the external circulation cooling water through a pipeline. A cooling water pressure regulating valve is provided on the pipeline between the heat exchanger and the external circulation cooling water. A junction box is provided on the top of the oil tank, through which all external power supply lines and signal lines are connected; The whole equipment is controlled by a control system. The output pressure is collected by a pressure sensor, and the signal is fed back through an external junction box. At the same time, the control signal is output to the lubricating oil pressure regulating valve through the junction box, thereby completing PID control; the filtering device is a lubricating oil filter; the control system is a PLC control system; The oil pressure and temperature control process is as follows: the system self-checks, and after confirming that the work has started, the temperature sensor temperature and the input required temperature are called for comparison; when the temperature input value is less than the temperature measurement value, the oil supply valve is closed, and the boost pump is turned on, so that the lubricating oil passage is pressurized by the boost pump, and returns to the oil tank for circulation through the bypass return oil passage, and the boost pump works to increase the lubricating oil temperature until it is close to the temperature input value; when the temperature input value is greater than the temperature measurement value, the oil supply valve is slowly opened, and the pressure measurement value and the pressure input value at the oil supply port on the oil supply line are called, and the pressure is controlled by adjusting the opening of the lubricating oil pressure regulating valve until it meets the pressure input value. At the same time, the temperature measurement value and the temperature input value are called, and the opening of the cooling water pressure regulating valve at the external circulation cooling water inlet is adjusted to control the external circulation cooling water inlet in the heat exchanger, thereby controlling the cooling rate until it meets the temperature input value.

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