Online monitoring sensor performance evaluation system

Abstract

The utility model discloses an online monitoring sensor performance evaluation system which comprises a control workbench, a detection oil way and a bubble generation system, an oil tank, a gear pump, a flow transmitter, a pressure regulator and a sensor to be detected are sequentially connected in series on the detection oil way to form a closed loop, and the oil tank is of a totally-enclosed structure. A temperature control heating device is arranged at the bottom of the bubble generating system, and the bubble generating system is connected with the oil tank through a gas delivery pipe and comprises a compressed gas cylinder and a flowmeter; according to the evaluation system, the actual working environment of the sensor to be tested is simulated more truly by controlling temperature, flow, oil pressure and bubble factors, the test result is more real, the accuracy is higher, and the parameter correction reliability is better; the bubble generation system is combined with a closed oil tank, bubbles are injected in a quantitative gas transmission mode, environments with different bubble quantities are simulated, and the performance of the to-be-tested sensor in various bubble environments can be evaluated; various bubble environments can be reproduced in the evaluation system test, the operability is high, and the test accuracy is high.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor performance testing, in particular to an online monitoring sensor performance evaluation system. Background Art

[0002] At present, online oil monitoring sensors have been widely used in wind turbine gearboxes, mainly monitoring the viscosity, moisture, dielectric constant, density, dynamic viscosity, ferromagnetic abrasive particles and non-ferromagnetic abrasive particles and abrasive particle concentration of gear oil. However, judging from the current application situation, there are still many problems to be solved and further researched. The most important one is the hardware system. The accuracy and consistency of sensors from different manufacturers are difficult to solve. Compared with the offline oil detection results, the accuracy of online oil sensing monitoring of oil still has a certain gap. The results monitored by some sensors have no practical significance and cannot be used for oil status analysis and normal maintenance of equipment. Therefore, it is necessary to evaluate and calibrate the performance of existing oil monitoring sensors, optimize and calibrate sensors for enterprises, improve analysis accuracy, speed up analysis, shorten analysis time, and provide data support to meet the needs of on-site monitoring;

[0003] The sensor performance evaluation system of the existing technology is unable to conduct comprehensive performance evaluation under multiple working conditions and environments, such as the detection performance of the sensor under different working temperatures, different oil pressures, and different flow rates. In particular, in the actual dynamic working environment, the lubricating oil usually has bubbles. Therefore, in order to better simulate the actual working environment, the evaluation system should simulate a variety of bubble environments and conduct a comprehensive test of the sensor. Patent 201711004557.2 Impurity Particle Detection Sensor Testing Device and Method discloses injecting bubbles into the detection oil to simulate the actual working environment, but it does not provide practical and operational means for the specific implementation method of injecting bubbles, the composition of the evaluation system with bubbles, and the actual operation. The simulated environment is single and the test accuracy cannot be guaranteed. Utility Model Content

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide an online monitoring sensor performance evaluation system to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0006] An online monitoring sensor performance evaluation system, comprising:

[0007] A control workbench is electrically connected to the sensor to be tested and is provided with a display screen for displaying actual test parameters and detection parameters of the sensor to be tested;

[0008] Detection oil circuit, the sensor to be tested is connected in series to the detection oil circuit; the detection oil circuit is sequentially connected in series with the oil tank, gear pump, flow transmitter, pressure regulator and the sensor to be tested to form a closed loop, the gear pump, flow transmitter and pressure regulator are electrically connected to the control workbench, the oil tank is a fully enclosed structure, and a temperature control and heating device is provided at the bottom;

[0009] The bubble generation system is connected to the oil tank through an air pipe and includes a compressed gas cylinder and a flow meter, and the flow meter is electrically connected to the control workbench.

[0010] Furthermore, it also includes an ultrasonic debubbler arranged in the oil tank, an exhaust valve is arranged on the top of the oil tank, and the ultrasonic debubbler is located directly below the exhaust valve.

[0011] Furthermore, the oil outlet pipe and oil return pipe of the detection oil circuit are respectively inserted into the oil tank from the top of both ends and extend under the oil. The port of the oil outlet pipe is lower than the port of the oil return pipe. The air pipe is set close to the oil outlet pipe, and its port is located below the oil. The port of the oil return pipe is set close to the ultrasonic debubbler.

[0012] Furthermore, an integrally formed protrusion on the top of the fuel tank is provided with an air collecting cavity, and the exhaust valve is located on the top of the air collecting cavity.

[0013] Preferably, the oil in the oil tank is working lubricating oil.

[0014] Furthermore, the detection oil circuit is arranged in the test cabinet, and the sensor to be tested is arranged outside the test cabinet. The detection oil circuit has two connecting pipes extending outside the test cabinet. Both connecting pipes are provided with oil shut-off valves, and both ends are provided with threaded joints for connecting the sensor to be tested in series.

[0015] Compared with the existing technology, the online monitoring sensor performance evaluation system of the utility model has the following beneficial effects:

[0016] 1. The evaluation system can simulate the actual working environment of the sensor to be tested more realistically by controlling temperature, flow, oil pressure and bubble factors. Therefore, the test results of the sensor to be tested are more realistic and more accurate. The parameters of the sensor to be tested can be calibrated and corrected based on the test results of the evaluation system, which improves reliability.

[0017] 2. The evaluation system integrates a bubble generation system with a closed oil tank and uses a quantitative gas delivery method to inject bubbles to simulate environments with different bubble amounts. This can evaluate the performance of the sensor under test under various bubble environments.

[0018] 3. The evaluation system can reproduce a variety of bubble environments during testing, inject a quantitative amount of gas, and circulate oil to evenly distribute the bubbles in the oil tank and the detection oil circuit. The detection performance of the sensor to be tested in a bubble-free environment and in bubble environments with various gas volumes is collected. At the same time, the detection parameters in the bubble-free environment can also be used as a reference for the defoaming stage. Therefore, its test method is highly operational and has high test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional diagram of the overall structure of the evaluation system of the present utility model;

[0020] Figure 2 This is a composition diagram of the evaluation system of the present utility model.

[0021] In the figure: 1. Control workbench; 2. Test cabinet; 3. Sensor to be tested; 4. Bubble generation system; 41. Compressed gas cylinder; 42. Flow meter; 43. Gas pipe; 44. Air flow shut-off valve; 5. Oil tank; 6. Gear pump; 7. Flow transmitter; 8. Pressure regulator; 9. Detection oil circuit; 91. Oil outlet pipe; 92. Oil return pipe; 93. Oil shut-off valve; 10. Exhaust valve. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only the best embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Online monitoring sensors are highly integrated and can generally monitor lubricating oil viscosity, moisture, operating temperature, operating oil pressure, and oil density simultaneously. The performance of online monitoring sensors from different manufacturers varies. Therefore, this embodiment provides an online monitoring sensor performance evaluation system that simulates the actual operating environment of online monitoring sensors. Therefore, evaluation and parameter correction based on test results can effectively improve detection accuracy in actual operating environments.

[0024] Specifically, if Figure 1-Figure 2 As shown, the evaluation system includes a control workbench 1, a detection oil circuit 9, and a bubble generation system 4; the control workbench 1 is provided with a display screen for displaying the actual test parameters and the detection parameters of the sensor 3 to be tested, and is provided with adjustment input buttons for setting the oil flow rate, oil pressure, and temperature according to the working speed, working temperature, and working oil pressure of the actual working environment; the control workbench 1 is located on the top of the test cabinet 2, and the detection oil circuit 9 is provided in the test cabinet 2;

[0025] The detection oil circuit 9 is connected in series with the oil tank 5, the gear pump 6, the flow transmitter 7, the pressure regulator 8 and the sensor to be tested 3 in sequence to form a closed loop. In order to improve the automation performance, the flow transmitter 7 and the gear pump 6 are electrically connected to the control workbench 1 respectively, and form a closed-loop control of the oil flow rate in the detection oil circuit 9. The gear pump 6 is driven by a servo motor with stepless speed regulation. The pressure regulator 8 is an electromagnetic pressure regulating valve, which and the oil pressure detection sensor provided on the detection oil circuit 9 are electrically connected to the control workbench 1 respectively. Similarly, a closed-loop control is formed to adjust and stabilize the oil pressure in the detection oil circuit 9 according to the preset oil pressure;

[0026] The oil tank 5 is a fully enclosed structure, and a temperature control and heating device is provided at the bottom thereof, which can heat the oil in the oil tank 5 according to a preset temperature. The oil in the oil tank 5 is working lubricating oil;

[0027] The bubble generating system 4 is arranged outside the test cabinet 2, and the gas supply pipe 43 is provided with a compressed gas cylinder 41 and a flow meter 42. The compressed gas cylinder 41 is connected to the oil tank 5 through the gas supply pipe 43. The gas supply pipe 43 is provided with a flow meter 42 and an air flow cut-off valve 44 in sequence. The flow meter 42 is electrically connected to the control workbench 1, and the ventilation volume is controlled according to the preset gas supply volume. By inputting different ventilation volumes into a certain amount of flowing oil, the working environment under various bubble volumes is simulated. In order to make the input air flow form bubbles evenly and quickly, the gas supply pipe 43 is connected to the oil tank 5 with a closed structure, and the output port of the gas supply pipe 43 is inserted into the oil and close to the port of the oil outlet pipe 91. A larger flow rate can be formed at the inlet of the oil outlet pipe 91, thereby accelerating the formation and flow of bubbles. In addition, since the closed oil tank 5, the oil outlet pipe 91 and the return oil pipe 92 form a closed loop, the injected bubbles cannot escape, so the gas supply volume basically forms bubbles in the oil.

[0028] In order to ensure the accuracy of the detection, it is necessary to defoam the oil after completing a single test. An ultrasonic debubbler is also included in the oil tank 5. At the same time, an electronic exhaust valve 10 is provided on the top of the oil tank 5. The ultrasonic debubbler and the exhaust valve 10 are electrically connected to the control workbench 1, and the exhaust operation can be automatically controlled. The ultrasonic debubbler is located directly below the exhaust valve 10. In order to facilitate the convergence of escaping gas, an integrated protrusion is provided on the top of the oil tank 5 to provide an air collecting cavity. The exhaust valve 10 is located at the top of the air collecting cavity and is connected to the air collecting cavity. In order to reduce the dead space in the oil tank 5, the oil level in the oil tank 5 should be close to the top surface of the oil tank 5 to reduce the amount of gas escaping from the oil during the oil circulation and heating process.

[0029] In addition, in order to speed up the uniform mixing of bubbles, the oil outlet pipe 91 and the oil return pipe 92 of the detection oil circuit 9 are inserted into the oil tank 5 from the top of both ends of the oil tank 5 and extend below the oil. At the same time, the port of the oil outlet pipe 91 and the port of the oil return pipe 92 are staggered, and the port of the oil outlet pipe 91 is lower than the port of the oil return pipe 92.

[0030] In order to achieve rapid flow and defoaming, the oil return pipe 92 port is set close to the ultrasonic debubbler;

[0031] In order to improve the convenience of operation, the sensor to be tested 3 is installed outside the test cabinet 2, and the detection oil circuit 9 has two connecting pipes extending outside the test cabinet 2. Both connecting pipes are provided with oil shut-off valves 93, and both ends are provided with threaded joints adapted to the interface of the sensor to be tested 3, which facilitates the serial installation and disassembly of the sensor to be tested 3.

[0032] The present invention also provides a testing method for an online monitoring sensor performance evaluation system, which includes the following contents:

[0033] First, calibration is performed using the oil in a bubble-free state as the reference environment. The sensor 3 to be tested is connected through a connecting pipe, the oil shut-off valve 93 is opened, and the test parameters are preset, including the preset detection temperature, flow rate, oil pressure, and gas delivery rate. The hydraulic oil in the oil tank 5 is heated to the preset detection temperature. At the same time, the gear pump 6 is turned on to circulate the oil, uniformly heating the oil in the oil tank 5 and the detection oil circuit 9 and circulating it at a constant speed. After the detection parameter values ​​of the sensor 3 to be tested are stabilized, the detection parameter correction values ​​of the sensor 3 to be tested in the bubble-free state are recorded; the detection parameter correction values ​​can be used to evaluate the detection performance of the sensor 3 to be tested in the bubble-free environment and the bubble environment;

[0034] Next, enter the bubble environment test phase for each gas delivery volume; start the bubble generation system 4, control its gas delivery flow rate, and match the gas delivery flow rate with the oil circulation flow rate so that the preset gas delivery volume is completed within one oil replacement cycle. The oil replacement cycle is the time required for the oil tank 5 with a fixed amount of oil to be completely drained at the preset circulation flow rate. At least two oil replacement cycles should be ensured. Observe the detection parameter value of the sensor to be tested 3. When it stabilizes within an acceptable variation range, it is considered that the bubble environment under the gas delivery volume is completely generated. Record the detection parameter value of the sensor to be tested 3 under the gas delivery volume, and evaluate the detection performance of the sensor to be tested 3.

[0035] If bubble environment simulation with multiple gas delivery volumes is required, in order to improve test efficiency, the tests should be carried out in the order of small to large gas delivery volumes. Since the oil tank 5 and the detection oil circuit 9 are closed environments, it can be assumed that no bubbles will escape. Therefore, using the same operating method, it is only necessary to input the gradient difference between the gas delivery volumes into the circulating oil to obtain the bubble simulation environment of the next gas delivery volume.

[0036] After completing the test of each sensor, defoaming is required. The exhaust valve 10 and the ultrasonic debubbler are automatically opened to break the bubbles through ultrasonic vibration waves and exhaust is carried out through the exhaust valve 10. The defoaming stage is carried out for at least one oil replacement cycle. The parameter value of the sensor to be tested 3 is judged with the help of the detection parameter correction value. Until it returns to the detection parameter correction value and stabilizes within the acceptable variation range, it is considered that the oil has completed defoaming; turn off the gear pump 6 and the temperature device.

[0037] The directional words such as "inside", "outside", "top", "bottom" and "end" mentioned in this article are based on Figure 1-Figure 2 The orientation or position relationship shown. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation;

[0038] Furthermore, some of the above terms may be used to express other meanings besides indicating a direction or positional relationship. For example, the terms "on" and "in" may also be used to express a dependency or connection relationship in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0039] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An online monitoring sensor performance evaluation system, characterized in that: include: A control workbench is electrically connected to the sensor to be tested and is provided with a display screen for displaying actual test parameters and detection parameters of the sensor to be tested; A detection oil circuit, on which the oil tank, gear pump, flow transmitter, pressure regulator and the sensor to be tested are connected in series in sequence to form a closed loop. The gear pump, the flow transmitter and the pressure regulator are electrically connected to the control workbench. The oil tank is a fully enclosed structure, and a temperature control and heating device is provided at the bottom; The bubble generating system is connected to the oil tank via an air pipe and comprises a compressed gas cylinder and a flow meter, wherein the flow meter is electrically connected to the control workbench.

2. The online monitoring sensor performance evaluation system according to claim 1, characterized in that: It also includes an ultrasonic debubbler arranged in the oil tank, an exhaust valve is arranged on the top of the oil tank, and the ultrasonic debubbler is located directly below the exhaust valve.

3. The online monitoring sensor performance evaluation system according to claim 2, characterized in that: The oil outlet pipe and oil return pipe of the detection oil circuit are respectively inserted into the oil tank from the top of both ends and extend under the oil. The port of the oil outlet pipe is lower than the port of the oil return pipe. The air pipe is arranged close to the oil outlet pipe, and its port is located below the oil. The port of the oil return pipe is arranged close to the ultrasonic debubbler.

4. The online monitoring sensor performance evaluation system according to claim 3, characterized in that: An integrally formed protrusion on the top of the fuel tank is provided with an air collecting cavity, and the exhaust valve is located on the top of the air collecting cavity.

5. The online monitoring sensor performance evaluation system according to any one of claims 1 to 4, characterized in that: The oil in the oil tank is working lubricating oil.

6. The online monitoring sensor performance evaluation system according to any one of claims 1 to 4, characterized in that: The detection oil circuit is arranged in the test cabinet, and the sensor to be tested is arranged outside the test cabinet. The detection oil circuit has two connecting pipes extending outside the test cabinet. Both connecting pipes are provided with oil shut-off valves, and both ends are provided with threaded joints for connecting the sensor to be tested in series.

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