Oil temperature control device of hydraulic test bed

Abstract

The utility model provides an oil temperature control device for a hydraulic test bed. The oil temperature control device comprises a hydraulic oil tank; the oil heater is arranged in the hydraulic oil tank, and the oil heater is used for heating hydraulic oil in the hydraulic oil tank; the cooling system is arranged on the oil return pipeline of the experiment table, and the cooling system is used for cooling the hydraulic oil in the oil return pipeline; the controller is used for controlling switches of the oil heater and the cooling system; according to the oil liquid temperature control device of the hydraulic test bed, the oil liquid temperature is regulated and controlled in a closed-loop control mode of oil liquid heating in the oil tank and system oil return cooling, the control precision of the oil temperature can be achieved, and the performance test requirements of hydraulic components with different oil temperatures are met.

Description

Technical Field

[0001] This application belongs to the technical field of oil temperature control, and particularly relates to an oil temperature control device for a hydraulic test bench. Background Technique

[0002] To verify the full-profile performance of helicopter hydraulic components, it is required to test the characteristic parameters at different hydraulic oil temperatures, and the accuracy control requirements for the oil temperature are high. However, in actual engineering applications, affected by factors such as throttling heat generation, system heat dissipation, large fuel tank volume, and large specific heat capacity of the oil, it is difficult to accurately control the oil temperature. Therefore, it is necessary to comprehensively consider the test requirements, heat generation factors, and temperature control technologies, and formulate oil heating and cooling strategies to meet the oil temperature control and test requirements. Utility Model Content

[0003] Purpose of this application: A hydraulic test bench oil temperature control device is proposed, which regulates the oil temperature by means of closed-loop control of heating the oil in the fuel tank and cooling the system return oil.

[0004] This application provides a hydraulic test bench oil temperature control device, and the device includes:

[0005] Hydraulic fuel tank;

[0006] Oil heater, arranged in the hydraulic fuel tank, and the oil heater is used to heat the hydraulic oil in the hydraulic fuel tank;

[0007] Cooling system, arranged on the return oil pipeline of the test bench, and the cooling system is used to cool the hydraulic oil in the return oil pipeline;

[0008] Controller, used to control the switches of the oil heater and the cooling system.

[0009] Preferably, the device further includes:

[0010] Hydraulic pump, connected to the hydraulic fuel tank, and the hydraulic pump is used to extract hydraulic oil from the hydraulic fuel tank and supply it to the test bench;

[0011] Temperature sensor, used to collect the temperature of the hydraulic oil at the outlet of the hydraulic pump and transmit the collected temperature signal to the controller.

[0012] Preferably, the controller is further used to generate a control instruction according to the temperature feedback by the temperature sensor and the target temperature, and control the switches of the oil heater and the cooling system based on the control instruction.

[0013] Preferably, the cooling system includes:

[0014] Plate heat exchanger, arranged on the return oil pipeline of the test bench;

[0015] A cooling water solenoid valve is used to control the switch of the cooling water entering the inside of the plate heat exchanger, and the cooling water solenoid valve is connected to the controller.

[0016] Preferably, the cooling system further includes:

[0017] A cooling water flow regulating valve is arranged upstream of the cooling water solenoid valve, and the cooling water flow regulating valve is used to regulate the flow rate of the cooling water entering the inside of the plate heat exchanger;

[0018] A cooling tower is connected to the cooling water flow regulating valve.

[0019] Preferably, the controller is a PLC controller; the device further includes:

[0020] A control computer is connected to the PLC controller; wherein, the control computer is used to provide an operation interface.

[0021] Advantageous technical effects of the present application:

[0022] A hydraulic test bench oil temperature control device provided by the present application adopts a closed-loop control method of heating the oil in the oil tank and cooling the system return oil to regulate the oil temperature, and can achieve the control accuracy of the oil temperature to meet the performance test requirements of hydraulic components at different oil temperatures. Description of the Drawings

[0023] Figure 1 It is a structural composition diagram of the hydraulic test bench oil temperature control provided by the embodiment of the present application;

[0024] Figure 2 It is a hydraulic schematic diagram of the pump source of the hydraulic test bench provided by the embodiment of the present application;

[0025] Wherein: 1 - oil heater, 2 - hydraulic pump, 3 - variable-frequency motor, 4 - electromagnetic relief valve, 5 - proportional relief valve, 6 - heat exchanger, 7 - cooling water solenoid valve, 8 - temperature sensor, 9 - temperature sensor, 10 - temperature sensor, 11 - hydraulic oil tank, 12 - cooling water flow regulating valve, 13 - cooling water circulation system. Detailed Embodiments

[0026] Please refer to Figure 1, the oil temperature control device proposed by the present utility model provided by this application mainly includes a control computer, a PLC controller, a cooling water solenoid valve, a cooling water flow regulating valve, a heat exchanger, an oil heater, a hydraulic oil tank, a temperature sensor, etc. The oil heater is installed in the hydraulic oil tank, and two variable-frequency motors drive the hydraulic pump. The electromagnetic overflow valve is used for high / low pressure switching of the pump source, and the pressure at the output end is adjusted by the proportional overflow valve. The system return oil is cooled by the heat exchanger and then filtered by the return oil filter and returned to the hydraulic oil tank. The cooling water solenoid valve is used to adjust the flow rate of the cooling water. Temperature sensors are provided at the oil suction point of the oil tank, the pump inlet, and the pump outlet. The temperature sensors at the oil suction point of the oil tank and the pump inlet are used for oil temperature display, and the temperature sensor at the pump outlet is used to participate in the control and display of the oil temperature.

[0027] Among them, the PLC controller, the cooling water solenoid valve, the oil heater, the oil heater, and the temperature sensor form a control loop, with the oil temperature at the position of the pump outlet temperature sensor as the control object. When the collected oil temperature is lower than the set target value, the cooling water solenoid valve is closed, and the oil heater is started to heat the oil in the oil tank; when the collected temperature is higher than the set target value, the cooling water solenoid valve is opened, the cooling water enters the heat exchanger, and the system return oil is cooled. In the cooling system, a cooling water flow regulating valve is provided upstream of the cooling water solenoid valve, and the opening of the cooling water flow regulating valve can be set to adjust the cooling water flow rate to meet the usage requirements under different cooling water temperature conditions.

[0028] See Figure 2 , P1 is the high-pressure oil supply for the left path, P2 is the high-pressure oil supply for the right path, and R is the system return oil. T0 is the actual oil temperature collected at the pump outlet, and T is the target oil temperature input by the control computer.

[0029] In other embodiments of this application, a hydraulic test bench oil temperature control device proposed by this application, the PLC controller, the oil heater 1, the cold water solenoid valve 7, and the temperature sensor 10 form a closed-loop control loop.

[0030] Among them, the hydraulic test bench includes two hydraulic pumps 2 and two variable-frequency motors 3. The hydraulic pump 2 is driven by the variable-frequency motor 3 to meet the pressure supply requirements for the left and right paths. The electromagnetic overflow valve 4 is used for the switching of high and low pressures of the pump source, and the system oil supply pressure is adjusted by the proportional overflow valve 5. The heat exchanger 6 is a water-cooled plate heat exchanger. The system return oil is cooled by the heat exchanger 6 and then returned to the hydraulic oil tank 11 through the return oil filter.

[0031] Among them, the PLC controller controls the opening and closing of the cold water solenoid valve 7, thereby controlling the startup and shutdown of the cooling water circulation system. The cooling water circulation system 13 operates outdoors, and the temperature of the cooling water changes with the ambient temperature. The system has different flow requirements for the cooling water. The relative opening parameter of the cooling water flow regulating valve 12 can be manually input on the control computer to adjust the cooling water flow of the cooling water circulation system 13 to meet the usage requirements under different cooling water temperature conditions.

[0032] Among them, four oil heaters 1 are evenly installed in the hydraulic oil tank 11 of the hydraulic test bench, and the PLC controller controls the opening and closing of the oil heaters 1.

Claims

1. A hydraulic test bench oil temperature control device, characterized in that, The device includes: A hydraulic oil tank; An oil heater, which is arranged in the hydraulic oil tank and is used to heat the hydraulic oil in the hydraulic oil tank; A cooling system, which is arranged on the return oil pipeline of the test bench and is used to cool the hydraulic oil in the return oil pipeline; A controller, which is used to control the switches of the oil heater and the cooling system.

2. The device according to claim 1, characterized in that, The device further includes: A hydraulic pump, which is connected to the hydraulic oil tank and is used to pump the hydraulic oil from the hydraulic oil tank and supply it to the test bench; A temperature sensor, which is used to collect the temperature of the hydraulic oil at the outlet of the hydraulic pump and transmit the collected temperature signal to the controller.

3. The device according to claim 2, characterized in that The controller is further used to generate a control instruction according to the temperature feedback by the temperature sensor and the target temperature, and control the switches of the oil heater and the cooling system based on the control instruction.

4. The device according to claim 3, characterized in that, The cooling system includes: A plate heat exchanger, which is arranged on the return oil pipeline of the test bench; A cooling water solenoid valve, which is used to control the switch of the cooling water entering the inside of the plate heat exchanger, and the cooling water solenoid valve is connected to the controller.

5. The device according to claim 4, characterized in that The cooling system further includes: A cooling water flow regulating valve, which is arranged upstream of the cooling water solenoid valve and is used to regulate the flow rate of the cooling water entering the inside of the plate heat exchanger; A cooling tower, which is connected to the cooling water flow regulating valve.

6. The device according to claim 5, characterized in that, The controller is a PLC controller; the device further includes: A control computer, which is connected to the PLC controller; wherein, the control computer is used to provide an operation interface.

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