阅读说明：本技术 一种气液比测试仪的校准设备及校准方法 (Calibration equipment and calibration method for gas-liquid ratio tester ) 是由 郑昊 田浩玲 夏志海 张博 冯哲 李玉锋 于 2020-10-30 设计创作，主要内容包括：本发明属于液压机械工业,液压测试技术领域,涉及一种气液比测试仪的校准设备及校准方法；包括负压油箱(1)、油滤组(2)、油泵组(3),压力调节测量机构(4),流量测量机构(5),温度调节测量机构(6)；本发明解决航空附件汽蚀试验中使用汽液比测试仪的需求,解决原厂商提供的校准方法误差过大的问题,提高校准精度,使汽液比测试仪可以应用到航空附件汽蚀试验中,为航空附件汽蚀试验中使用气液比测试仪替代汽液比计算法提供基础和可靠依据；同时该发明也有极大的推广应用价值,在航天附件试验,火箭燃料加注,各类型泵抗汽蚀试验等需要检测汽液比的地方都可使用。(The invention belongs to the hydraulic machinery industry, the hydraulic test technical field, relate to a calibration equipment and calibration method of the tester of gas-liquid ratio; the device comprises a negative pressure oil tank (1), an oil filter group (2), an oil pump group (3), a pressure adjusting and measuring mechanism (4), a flow measuring mechanism (5) and a temperature adjusting and measuring mechanism (6); the invention solves the requirement of using the gas-liquid ratio tester in the aviation accessory cavitation test, solves the problem of overlarge error of the calibration method provided by the original manufacturer, improves the calibration precision, enables the gas-liquid ratio tester to be applied to the aviation accessory cavitation test, and provides a basis and a reliable basis for using the gas-liquid ratio tester to replace a gas-liquid ratio calculation method in the aviation accessory cavitation test; meanwhile, the invention also has great popularization and application values, and can be used in places needing to detect the vapor-liquid ratio, such as aerospace accessory tests, rocket fuel filling, various types of pump anti-cavitation tests and the like.)

1. The calibration equipment of the gas-liquid ratio tester is characterized by comprising a negative pressure oil tank (1), an oil filter group (2), an oil pump group (3), a pressure regulation measuring mechanism (4), a flow measuring mechanism (5) and a temperature regulation measuring mechanism (6); the outlet of the negative pressure oil tank (1) is connected with the oil filter group (2), the outlet of the oil filter group (2) is connected with the pressure adjusting and measuring mechanism (4), the pressure adjusting and measuring mechanism (4) adopts a flow adjusting valve, and a pressure sensor is arranged to measure a pressure value; the outlet of the pressure adjusting and measuring mechanism (4) is connected with a gas-liquid ratio tester sensor, the outlet of the gas-liquid ratio tester sensor is connected with an oil pump set (3), the outlet of the oil pump set (3) is connected with a flow measuring mechanism (5), the outlet of the flow measuring mechanism (5) is connected with a temperature adjusting and measuring mechanism (6), the temperature adjusting and measuring mechanism (6) is connected with cooling water and steam provided by a test plant to heat or cool fuel oil, so that the fuel oil is stabilized at a required temperature, and a temperature sensor is mounted to measure a temperature value; the outlet of the temperature adjusting and measuring mechanism (6) is connected with the negative pressure oil tank (1), and the oil returns to the oil tank for repeated circulation.

2. Calibration equipment for gas-liquid ratio tester according to claim 1 characterized in that the negative pressure oil tank (1) is a special oil tank conforming to GB150-1998 steel pressure vessel, and the matching vacuum pump and regulating valve ensure the oil tank pressure to be 0.067 +/-0.004 MPa (absolute pressure).

3. Calibration device for a gas-liquid ratio tester according to claim 1, characterized in that the oil filter group (2) uses stainless steel filter elements.

4. The apparatus for calibrating a gas-to-liquid ratio tester as recited in claim 1 wherein said gas-to-liquid ratio tester sensor measures a gas-to-liquid ratio value that is displayed by the gas-to-liquid ratio tester.

5. The calibration equipment of the gas-liquid ratio tester as recited in claim 1, characterized in that the oil pump group (3) uses a high-flow centrifugal pump and a transmission system to simulate the state of an aviation fuel pump tool.

6. The calibrating apparatus for gas-liquid ratio tester as recited in claim 1, wherein the flow measuring means (5) is composed of a turbine flowmeter and a switching valve, and the turbine flowmeter is selected according to the actual flow rate to measure the flow rate value.

7. The calibration equipment for the gas-liquid ratio tester as claimed in claim 1, wherein the temperature regulation and measurement mechanism (6) adopts two spiral plate heat exchangers and two three-way regulating valves, the two spiral plate heat exchangers are respectively connected with cooling water and steam provided by a test plant for heating or cooling oil flowing through, and the two three-way regulating valves regulate the flow rate of the oil flowing through the spiral plate heat exchangers to control the oil to reach the required temperature.

8. A method of calibrating a gas-to-liquid ratio tester as claimed in any one of claims 1 to 7, including laboratory and bench calibrations:

firstly, performing laboratory calibration on a gas-liquid ratio tester, injecting No. 3 jet fuels with different volumes into a gas-liquid ratio tester sensor, recording an indicated value of the corresponding liquid ratio tester, and completing the laboratory calibration work of the sensor after repeatedly adjusting for many times;

and step two, performing test bed calibration on the gas-liquid ratio tester, mounting a sensor of the gas-liquid ratio tester to calibration equipment, starting an oil pump group (3), adjusting the pressure of a negative pressure oil tank (1), adjusting a pressure adjusting and measuring mechanism (4) to different pressure values, recording an indicated value of the corresponding gas-liquid ratio tester, simultaneously recording the rotating speed of a high-flow centrifugal pump in the oil pump group (3), the flow in a flow measuring mechanism (5) and the temperature in a temperature adjusting and measuring mechanism (6), and completing the calibration work of a test chamber of the sensor after repeated multiple adjustments.

9. The calibration method of the gas-liquid ratio tester of any one of claim 8, wherein the laboratory calibration requires a special calibration fixture, and the calibration fixture comprises a mounting bracket (7), a liquid level indicator (8) and an oil regulating assembly (9); the mounting bracket (7) is used as a mounting platform, seals and fastens the gas-liquid ratio tester sensor, and has a 180-degree angle adjusting function; liquid level indicator (8) and fluid adjusting part (9) are connected in installing support (7), and liquid level indicator (8) can observe the inside liquid height of sensor, calculate the inside gas-liquid ratio of sensor to compare the inside gas-liquid ratio of calculation sensor as actual value and gas-liquid ratio tester display value.

10. The calibration method of the gas-liquid ratio tester as recited in claim 9, wherein the oil regulating assembly (9) is mainly composed of a regulating valve, and can discharge oil inside the gas-liquid ratio tester sensor to adjust the volume of the liquid inside the sensor.

Technical Field

The invention belongs to the hydraulic machinery industry and the hydraulic test technical field, and relates to a calibration device and a calibration method of a gas-liquid ratio tester.

Background

The cavitation test is to simulate the engine in high air condition, when the pressure at the inlet of the oil pump is reduced to below the standard air condition, and the pump sucks a certain proportion of gas-liquid mixed oil, to test whether the oil supply characteristic of the pump meets the performance requirement of the engine, and the anti-abrasion capability and anti-cavitation capability of the pump parts. Is a very important test item for aviation accessories,

after the simulated engine was operated at 10 km high atmospheric conditions, the wear and cavitation resistance of the pump parts was checked. The existing aviation accessory cavitation test is always carried out by adopting a vapor-liquid ratio calculation method, the vapor-liquid ratio is obtained by indirect calculation, and the vapor-liquid ratio is influenced by processes such as conversion and the like and often has a large error with an actual value. The gas-liquid ratio tester is used in the aero-accessory cavitation test, belongs to the field in China for the first time and has important reference significance to the whole industry.

Because the vapor-liquid ratio tester is used in the test for the first time, the calibration and detection of the tester are the most critical, so the working principle and the using method of the vapor-liquid ratio tester are studied in detail and the operation is practical, and the precision of the calibration equipment and the calibration method provided by the original company is not high. The original company provides calibration equipment as a polytetrafluoroethylene rod, and the principle that the dielectric constant of polytetrafluoroethylene is close to that of fuel oil is used as a verification basis. However, in actual operation, the concentricity of a sensing coil and an interface in the gas-liquid ratio tester sensor is poor, a gap is always formed in the polytetrafluoroethylene rod sensor, and the results of multiple times of calibration are different. It is common to contact manufacturers as interpreted by manufacturing process decisions. The cavitation test result is particularly important for the aviation fuel pump, and small errors can cause design deviation. Therefore, a calibration device and a calibration method with high reliability, high accuracy and good operability need to be found.

Disclosure of Invention

The purpose of the invention is as follows: the calibration equipment and the calibration method of the vapor-liquid ratio tester for the cavitation test of the aviation fuel pump can be met. The method has the advantages of high calibration precision, convenience in operation and capability of replacing the measuring medium according to the actual test condition. The method provides a foundation and a reliable basis for replacing a gas-liquid ratio calculation method with a gas-liquid ratio tester in an aviation accessory cavitation test.

The technical scheme of the invention is as follows:

a calibration device of a gas-liquid ratio tester is characterized by comprising a negative pressure oil tank 1, an oil filter group 2, an oil pump group 3, a pressure regulation measuring mechanism 4, a flow measuring mechanism 5 and a temperature regulation measuring mechanism 6; the outlet of the negative pressure oil tank 1 is connected with an oil filter group 2, the outlet of the oil filter group 2 is connected with a pressure adjusting and measuring mechanism 4, the pressure adjusting and measuring mechanism 4 adopts a flow adjusting valve, and a pressure sensor is arranged to measure a pressure value; the outlet of the pressure adjusting and measuring mechanism 4 is connected with a gas-liquid ratio tester sensor, the outlet of the gas-liquid ratio tester sensor is connected with an oil pump set 3, the outlet of the oil pump set 3 is connected with a flow measuring mechanism 5, the outlet of the flow measuring mechanism 5 is connected with a temperature adjusting and measuring mechanism 6, the temperature adjusting and measuring mechanism 6 is connected with cooling water and steam provided by a test plant to heat or cool fuel oil, so that the fuel oil is stabilized at a required temperature, and a temperature sensor is installed to measure a temperature value; the outlet of the temperature adjusting and measuring mechanism 6 is connected with the negative pressure oil tank 1, and the oil returns to the oil tank for repeated circulation.

The negative pressure oil tank 1 adopts a special oil tank conforming to GB150-1998 steel pressure container, and a matched vacuum pump and a regulating valve ensure that the pressure of the oil tank is 0.067 +/-0.004 MPa (absolute pressure).

The oil filter group 2 adopts a stainless steel filter element.

The gas-liquid ratio tester sensor is used for measuring a gas-liquid ratio and displaying the gas-liquid ratio by the gas-liquid ratio tester.

And the oil pump group 3 adopts a large-flow centrifugal pump and a transmission system to simulate the state of an aviation fuel pump tool.

The flow measuring mechanism 5 is composed of a turbine flowmeter and a switching valve, and the turbine flowmeter is selected according to the actual flow to measure the flow value.

The temperature regulation measuring mechanism 6 adopts two spiral plate heat exchangers and two three-way regulating valves, the two spiral plate heat exchangers are respectively connected with cooling water and steam provided by a test plant and used for heating or cooling oil flowing through, the two three-way regulating valves regulate the flow of the oil flowing through the spiral plate heat exchangers, and the oil is controlled to reach the required temperature.

A calibration method of a gas-liquid ratio tester is characterized by comprising laboratory calibration and test bed calibration:

firstly, performing laboratory calibration on a gas-liquid ratio tester, injecting No. 3 jet fuels with different volumes into a gas-liquid ratio tester sensor, recording an indicated value of the corresponding liquid ratio tester, and completing the laboratory calibration work of the sensor after repeatedly adjusting for many times;

and step two, performing test bed calibration on the gas-liquid ratio tester, mounting a sensor of the gas-liquid ratio tester to calibration equipment, starting the oil pump group 3, adjusting the pressure of the negative pressure oil tank 1, adjusting the pressure adjusting and measuring mechanism 4 to different pressure values, recording an indicated value of the corresponding gas-liquid ratio tester, simultaneously recording the rotating speed of a high-flow centrifugal pump in the oil pump group 3, the flow in the flow measuring mechanism 5 and the temperature in the temperature adjusting and measuring mechanism 6, and completing the calibration work of a test chamber of the sensor after repeated multiple adjustments.

The calibration of the laboratory needs a special calibration tool, and the calibration tool comprises a mounting bracket 7, a liquid level indicator 8 and an oil liquid regulating assembly 9; the mounting bracket 7 is used as a mounting platform, seals and fastens a gas-liquid ratio tester sensor, and has a 180-degree angle adjusting function; the mounting bracket 7 is connected with a liquid level indicator 8 and an oil liquid regulating component 9, the liquid level indicator 8 can observe the liquid height in the sensor, the gas-liquid ratio in the sensor is calculated, and the gas-liquid ratio in the sensor is calculated and compared with the display value of the gas-liquid ratio tester as an actual value.

The oil liquid adjusting assembly 9 is mainly composed of an adjusting valve and can discharge oil liquid in the gas-liquid ratio tester sensor to achieve the purpose of adjusting the volume of the liquid in the sensor.

The mounting bracket 7 has a 180 degree angle adjustment function.

The invention has the technical effects that:

the calibration equipment and the calibration method of the gas-liquid ratio tester provided by the invention solve the requirement of using the gas-liquid ratio tester in the aviation accessory cavitation test, solve the problem of overlarge error of the calibration method provided by the original manufacturer, improve the calibration precision, enable the gas-liquid ratio tester to be applied to the aviation accessory cavitation test, and provide a basis and a reliable basis for replacing a gas-liquid ratio calculation method with the gas-liquid ratio tester in the aviation accessory cavitation test.

Meanwhile, the invention also has great popularization and application values, and can be used in places needing to detect the vapor-liquid ratio, such as aerospace accessory tests, rocket fuel filling, various types of pump anti-cavitation tests and the like.

Drawings

FIG. 1 is a schematic diagram of a calibration apparatus of the present invention

FIG. 2 is a schematic view of the structure of the calibration fixture of the present invention

Wherein: 1-a negative pressure oil tank; 2-oil filtration group; 3-an oil pump group; 4-a pressure regulating measuring mechanism; 5-a flow measuring mechanism; 6-temperature regulating and measuring mechanism; 7-mounting a bracket; 8-a liquid level indicator; 9-an oil regulating component;

Detailed Description

The invention is further described below with reference to the accompanying drawings:

the utility model provides a calibration equipment of gas-liquid ratio tester, includes negative pressure oil tank 1, oil filter group 2, oil pump group 3, pressure regulation measuring mechanism 4, flow measuring mechanism 5, temperature regulation measuring mechanism 6. See figure 1 for a schematic diagram.

Wherein the negative pressure oil tank 1 adopts a special oil tank which accords with GB150-1998 steel pressure container, and a vacuum pump and a regulating valve are matched to ensure that the pressure of the oil tank is 0.067 +/-0.004 MPa (absolute pressure); the outlet of the negative pressure oil tank 1 is connected with an oil filter group 2, and the oil filter group 2 adopts a stainless steel filter element, so that the cleanliness of a working medium is ensured; the outlet of the oil filter group 2 is connected with a pressure adjusting and measuring mechanism 4, the pressure adjusting and measuring mechanism 4 adopts a flow adjusting valve, the inlet pressure is further reduced, and a pressure sensor is arranged to measure a pressure value; the outlet of the pressure adjusting and measuring mechanism 4 is connected with a gas-liquid ratio tester sensor, and the gas-liquid ratio measured by the sensor is displayed by the gas-liquid ratio tester; the outlet of a sensor of the gas-liquid ratio tester is connected with an oil pump set 3, and the oil pump set 3 adopts a large-flow centrifugal pump and a transmission system to simulate the state of an aviation fuel pump tool; the outlet of the oil pump set 3 is connected with a flow measuring mechanism 5, the flow measuring mechanism 5 consists of a turbine flowmeter and a switching valve, and a proper turbine flowmeter is selected to measure a flow value according to the actual flow; the outlet of the flow measuring mechanism 5 is connected with a temperature adjusting and measuring mechanism 6, the temperature adjusting and measuring mechanism 6 adopts two spiral plate heat exchangers and two three-way regulating valves, and is connected with cooling water and steam provided by a test factory building to heat or cool fuel oil, so that the fuel oil is stabilized at a required temperature, and a temperature sensor is installed to measure a temperature value; the outlet of the temperature adjusting and measuring mechanism 6 is connected with the negative pressure oil tank 1, and the oil returns to the oil tank for repeated circulation.

A calibration method of a gas-liquid ratio tester comprises laboratory calibration and test bed calibration:

the method comprises the steps of firstly, carrying out laboratory calibration on a gas-liquid ratio tester, adjusting the gas-liquid ratio tester to a zero position when a gas-liquid ratio tester sensor is empty, filling a No. 3 jet fuel into the gas-liquid ratio tester sensor, adjusting the gas-liquid ratio tester to a full-scale value, locking various adjusting knobs after repeated multiple adjustments, and finishing preliminary calibration work of the gas-liquid ratio tester. Reversely pushing the oil volume according to the gas-liquid ratio required by the cavitation test, injecting the oil with the corresponding volume into a gas-liquid ratio tester sensor, recording the indicated value of the meter, and completing the laboratory calibration work of the sensor after repeatedly adjusting for many times, wherein the laboratory calibration data are shown in table 1;

TABLE 1 laboratory calibration data

Fuel volume mL	336	672	840	1006	1120	1159	1344	1400	1527
										Theoretical V/L	4	1.5	1	0.67	0.5	0.45	0.25	0.2	0.1
Theoretical LOG	20	40	50	60	67	69	80	83.3	91
										Actually measured V/L	5.8	1.6	1	0.65	0.45	0.4	0.2	0.16	0.06
Actually measured LOG	14	38	49	60	68	70	82	85	94

The calibration of the laboratory needs a special calibration tool, and the calibration tool comprises a mounting bracket 7, a liquid level indicator 8 and an oil liquid regulating assembly 9; the mounting bracket 7 is used as a mounting platform, seals and fastens a gas-liquid ratio tester sensor, and has a 180-degree angle adjusting function; the mounting bracket 7 is connected with a liquid level indicator 8 and an oil liquid regulating component 9, the liquid level indicator 8 can observe the liquid height in the sensor, the gas-liquid ratio in the sensor is calculated, and the gas-liquid ratio in the sensor is calculated and compared with the display value of the gas-liquid ratio tester as an actual value. The structure schematic diagram is shown in figure 2.

And step two, carrying out test bed calibration on the gas-liquid ratio tester, installing a gas-liquid ratio tester sensor to calibration equipment, firstly opening each switch and each regulating valve, starting the oil pump set 3, and regulating the rotating speed of the pump to a certain value and be stable. And (3) opening a matched vacuum pump in the negative pressure oil tank 1 to reduce the pressure in the negative pressure oil tank 1, and stabilizing the pressure to 0.067 +/-0.004 MPa (absolute pressure) through a regulating valve. The inlet pressure of a gas-liquid ratio tester sensor is reversely pushed according to the gas-liquid ratio required by a cavitation test, the required pressure is set and recorded by using a flow regulating valve in a pressure regulating and measuring mechanism 4, the flow of oil flowing through a heating and refrigerating spiral plate heat exchanger is regulated by using a three-way regulating valve in a temperature regulating and measuring mechanism 6, the oil is controlled to reach the required temperature and recorded, and meanwhile, the indicated value of the liquid ratio tester, the rotating speed of a high-flow centrifugal pump in an oil pump set 3, the flow in a flow measuring mechanism 5 and other data are recorded. And after the inlet pressure of the gas-liquid ratio tester sensor is adjusted for multiple times, the calibration work of the test bed of the sensor is completed. The bench calibration data is shown in table 2:

TABLE 2 test bench calibration data

A tester: the atmospheric pressure in the day: 96KPa working medium: no. 3 jet fuel