Device and method for measuring performance of bimetallic temperature control sensor of air entraining system of airplane

Abstract

The invention discloses a device and method for measuring the performance of a bimetallic temperature control sensor of an airplane bleed air system, and the device is provided with a buoyancy platform, a laser range finder, a fixed seat, an X-Y recorder and an oil bath box, the oil bath box can control the temperature of a heat transmission medium in the oil bath box, and the oil bath box is provided with a temperature collector. The buoyancy table floats on the heat transmission medium in the oil bath box, a mounting hole is formed in the middle of the buoyancy table, the fixed seat is arranged on the buoyancy table, and the laser range finder is arranged at the upper end of the fixed seat; the signal output end of the laser range finder and the signal output end of the temperature collector are electrically connected with the signal input end of the X-Y recorder. During testing, the bimetallic temperature control sensor to be measured is installed on the buoyancy table through the fixing base, the temperature control rate and range of the oil bath box are set, and parameters in the testing process are automatically recorded through the X-Y recorder. The device is convenient and fast to operate, effectively improves the detection efficiency, reduces the human intervention, and achieves the automatic measurement.

Description

Technical Field

[0001] This invention relates to a performance measurement device for a bimetallic temperature control sensor in an aircraft bleed air system, and also to a measurement method for measuring a bimetallic temperature control sensor associated with a temperature control valve in a civil aircraft bleed air system using the aforementioned performance measurement device. Background Technology

[0002] The function of an aircraft bleed air system is to regulate the high-pressure, high-temperature gases from the power system through flow control, pressure regulation, or temperature mixing to produce gases with suitable parameters for purposes such as ambient temperature control, pressure control, hot gas anti-icing, and water tank pressurization. Aircraft bleed air systems typically employ bimetallic temperature sensors for flow control.

[0003] like Figure 2 The diagram shows the assembly structure of the bimetallic temperature sensor 1. One end of the bimetallic temperature sensor 1 is provided with a threaded connector 1-1, which is threadedly connected to the pressure regulator 9 of the aircraft bleed air system. The core component of the bimetallic temperature sensor 1 consists of a stainless steel base 1-4 and a nickel steel (Invar alloy) actuating rod. One end of the nickel steel actuating rod 1-3 extends into an actuating rod end 1-2, which passes through the connector 1-1 and extends into the pressure regulator 9. Due to the different coefficients of thermal expansion of stainless steel and nickel steel, a displacement difference will occur between the nickel steel actuating rod 1-3 and the stainless steel base 1-4 at different temperatures. This mechanical displacement stroke controls the pressure by controlling the opening of the slide valve, thereby controlling the opening of the mixed air valve and adjusting the bleed air control temperature.

[0004] As the bimetallic temperature sensor 1 is used over time, it will experience wear, deformation, and aging, leading to performance degradation and directly affecting the regulation of bleed air temperature. Therefore, accurately and reliably measuring the parameters of the bimetallic temperature sensor 1 to achieve precise troubleshooting has always been a key focus of maintenance.

[0005] The conventional testing method involves heating the bimetallic temperature sensor 1 in an oven and measuring the stroke of the nickel steel actuator 1-3 with a dial indicator. Temperature and stroke data are uniformly acquired at 10 points between room temperature and 200℃. After measuring the values ​​at each point, a curve of stroke temperature is hand-drawn (X-axis represents temperature, Y-axis represents stroke).

[0006] However, the above detection methods have many drawbacks:

[0007] 1. The oven heats up by conducting heat through air. Because air has low thermal conductivity, it takes more than 10 minutes after setting the temperature for the surface temperature of the bimetallic temperature sensor to stabilize. The measurement process requires a lot of manpower.

[0008] 2. The oven has poor thermal uniformity, and there is a temperature deviation of about 0.2 degrees Celsius per decimeter at different heights inside the oven, which reduces the accuracy of measurement.

[0009] 3. The hand-drawn curve of the measurement point has errors, and the more points taken, the closer the curve is to the accuracy, but the detection time is greatly increased.

[0010] 4. The dial gauge measurement is a contact measurement, which needs to be placed in the oven together, and the high temperature will cause the dial gauge measurement rod to expand, reducing the accuracy of measurement.

[0011] It can be seen that the existing measurement method occupies more manpower, has low reliability, and cannot accurately obtain the stroke temperature curve. SUMMARY

[0012] The first object of the present application is to provide a bimetallic temperature control sensor performance measurement device for an aircraft bleed air system.

[0013] The second object of the present application is to provide a measurement method for measuring a bimetallic temperature control sensor using the bimetallic temperature control sensor performance measurement device.

[0014] The first object of the present application is achieved by the following technical solutions:

[0015] A bimetallic temperature control sensor performance measurement device for an aircraft bleed air system, characterized in that it comprises a buoyancy platform, a laser range finder, a fixed seat, an X-Y recorder and an oil bath tank containing a heat transfer medium, the oil bath tank can control the temperature of the heat transfer medium inside, the oil bath tank is provided with a temperature collector capable of collecting the temperature of the heat transfer medium inside, the buoyancy platform floats on the heat transfer medium in the oil bath tank, the middle of the buoyancy platform is provided with a mounting hole, the fixed seat is arranged on the upper surface of the buoyancy platform, and the laser range finder is arranged at the upper end of the fixed seat; during measurement, the bimetallic temperature control sensor is located below the buoyancy platform, the connecting head of the bimetallic temperature control sensor passes through the mounting hole and is threadedly connected with the fixed seat together, the stroke of the nickel steel actuating rod of the bimetallic temperature control sensor is obtained through the measurement of the laser range finder; the signal output end of the laser range finder and the signal output end of the temperature collector are electrically connected with the signal input end of the X-Y recorder.

[0016] The further technical solution of the present application is that the fixed seat is in the shape of a cylinder, the lower end of the fixed seat is open and is provided with an internal thread, which can be threadedly connected with the connecting head of the bimetallic temperature control sensor, the upper end of the fixed seat is provided with a perforation, and the laser range finder is installed at the upper end of the fixed seat, and the measurement end of the laser range finder extends into the fixed seat through the perforation.

[0017] The further technical solution of the present application is that the buoyancy platform is in the shape of a flat plate and is internally provided with a cavity.

[0018] The further technical scheme of the present application is that the material of the buoyant platform is high-temperature-resistant plastic material.

[0019] The further technical scheme of the present application is that the heat transfer medium is silicon oil or heat-conducting oil.

[0020] The further technical scheme of the present application is that the temperature control range of the heat transfer medium in the oil bath box is -50 DEG C to 250 DEG C.

[0021] The second object of the present application is achieved by the following technical scheme:

[0022] A measurement method for measuring the bimetallic temperature control sensor by using the bimetallic temperature control sensor performance measurement device, characterized in that the method comprises the following steps:

[0023] P1, the bimetallic temperature control sensor to be measured is installed on the buoyant platform through the fixing seat, and a laser range finder is installed, and then the buoyant platform is placed on the heat transfer medium in the oil bath box;

[0024] The laser range finder and the temperature collector are respectively connected with the X-Y recorder through wires;

[0025] P2, the temperature of the heat transfer medium in the oil bath box is set to 0 DEG C, and after the temperature is stable, the value of the laser range finder is set to zero;

[0026] P3, the temperature control rate and range of the oil bath box are set;

[0027] P4, the oil bath box is started, and the X-Y recorder synchronously records the temperature parameters collected by the temperature collector and the stroke parameters measured by the laser range finder;

[0028] P5, after the heat transfer medium in the oil bath box reaches the set maximum temperature, a set time is waited, and then the oil bath box is turned off, and the test is completed.

[0029] Compared with the prior art, the present application has the following beneficial effects:

[0030] 1、The bimetallic temperature control sensor performance measurement device of the present application is used, the bimetallic temperature control sensor to be measured is installed on the buoyant platform through the fixing seat, and the temperature control rate and range of the oil bath box are set, the parameters of the test process are recorded automatically by the X-Y recorder, the operation is convenient and fast, the detection efficiency is effectively improved, personnel intervention is reduced, and automatic measurement is realized.

[0031] 2、The present application replaces the traditional point measurement by data collection, and improves the test accuracy.

[0032] 3、The present application obtains the stroke by the measurement of the non-contact laser range finder, better eliminates the error generated by the contact measurement, and improves the test accuracy.

[0033] 4. This invention utilizes the heat transfer medium inside the oil bath for heat transfer, which has better thermal conductivity than air, shortens the measurement time, and improves thermal uniformity. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the performance measurement device of this invention when measuring a bimetallic temperature control sensor;

[0035] Figure 2 This is a schematic diagram of a bimetallic temperature sensor mounted on a pressure regulator.

[0036] Meaning of the labels in the attached diagram:

[0037] 1. Bimetallic temperature sensor; 1-1. Connector; 1-2. Actuator end; 1-3. Nickel steel actuator; 1-4. Stainless steel base; 2. Buoyancy platform; 2-1. Cavity; 2-2. Mounting hole; 3. Fixing base; 3-1. Internal thread; 3-2. Through hole; 4. Laser rangefinder; 5. XY recorder; 6. Oil bath; 6-1. Temperature acquisition device; 7. Heat transfer medium; 8. Cable; 9. Pressure regulator. Detailed Implementation

[0038] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0039] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0040] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0041] The present invention will be further described below with reference to embodiments.

[0042] Example:

[0043] likeFigure 1 The figure shows the bimetallic temperature control sensor performance measurement device of the aircraft bleed air system of the embodiment, which includes a buoyant platform 2, a laser range finder 4, a fixed seat 3, an X-Y recorder 5 and an oil bath box 6.

[0044] The oil bath box 6 is internally provided with a heat transfer medium 7, which can be silicone oil or heat conducting oil. Compared with air, silicone oil and heat conducting oil have better thermal stability and heat conduction performance, which can shorten the measurement time and improve the thermal uniformity.

[0045] The oil bath box 6 is provided with a conventional refrigeration and heating device, which can control the temperature of the internal heat transfer medium 7. The conventional refrigeration and heating device will not be described here. The specific temperature control range of the internal heat transfer medium 7 of the oil bath box 6 is -50℃ to 250℃, and a uniform speed temperature control rate can be set, for example, the temperature control rate can be 0.1℃ / second. The oil bath box 6 is also provided with a temperature collector 6-1, which can collect the temperature of the internal heat transfer medium 7 and display the collected temperature data. The temperature collector 6-1 can be a temperature sensor immersed in the heat transfer medium 7 to collect temperature data. The temperature collector 6-1 has a data output function and can be connected to an X-Y recorder.

[0046] The buoyant platform 2 of the embodiment is a flat plate, internally provided with a cavity 2-1, and made of high-temperature-resistant plastic material, such as polytetrafluoroethylene PTFE, etc. The middle part of the buoyant platform 2 is provided with a mounting hole 2-2 for mounting the bimetallic temperature control sensor 1 to be tested. In use, the buoyant platform 2 is placed on the heat transfer medium 7 in the oil bath box 6 and floats on the heat transfer medium 7. The buoyancy generated by the buoyant platform 2 is sufficient to support the bimetallic temperature control sensor 1 and the remaining components thereon, and will not sink.

[0047] The fixed seat 3 of the embodiment is in the shape of a cylinder and is in a vertical state in use. The lower end of the fixed seat 3 is open and provided with an internal thread 3-1, which can be threadedly connected with the connecting head 1-1 of the bimetallic temperature control sensor 1. The upper end of the fixed seat 3 is provided with a through hole 3-2. The laser range finder 4 is fixedly installed on the upper end of the fixed seat 3 by conventional fixing methods such as glue fixing or mechanical fixing, and the measuring end of the laser range finder 4 extends into the fixed seat 3 through the through hole 3-2. During measurement, the laser emitted by the laser range finder 4 is vertically downwardly irradiated to the middle part of the upper end surface of the actuator end head 1-2 of the nickel steel actuator rod 1-3 of the bimetallic temperature control sensor 1 to measure the distance, and the stroke of the nickel steel actuator rod 1-3 is obtained by measuring the distance change. The stroke of the nickel steel actuator rod 1-3 is obtained by the laser range finder 4 in a non-contact manner, which can better eliminate the error caused by contact measurement and improve the accuracy of the test.

[0048] When installing, the fixed seat 3 is located on the upper surface of the buoyant platform 2, the bimetallic temperature control sensor 1 is located below the buoyant platform, the bimetallic temperature control sensor 1 is in a vertical state, the connecting head 1-1 of the bimetallic temperature control sensor 1 vertically penetrates through the installation hole 2-2 and penetrates out to the upper surface of the buoyant platform 2 and is screwed together with the lower end of the fixed seat 3, so that the bimetallic temperature control sensor 1 is fixedly installed on the buoyant platform 2 through the fixed seat 3.

[0049] The signal output end of the laser range finder 4 and the signal output end of the temperature collector 6-1 are electrically connected with the signal input end of the X-Y recorder 5, the X-Y recorder 5 synchronously obtains the temperature parameter collected by the temperature collector 6-1 and the stroke parameter measured by the laser range finder 4 during measurement, and generates an X-Y curve, the X-axis of the X-Y curve is temperature and the Y-axis is stroke.

[0050] The measurement method for measuring the bimetallic temperature control sensor 1 by using the above-mentioned bimetallic temperature control sensor performance measurement device includes the following steps:

[0051] P1, install the bimetallic temperature control sensor 1 to be measured on the buoyant platform 2 through the fixed seat 3, and install the laser range finder 4, the measurement end of the laser range finder 4 faces the upper end surface of the actuator end head 1-2 of the nickel steel actuator rod 1-3 of the bimetallic temperature control sensor 1, and the laser emitted by the laser range finder 4 is vertically downwardly irradiated to the middle part of the upper end surface of the actuator end head 1-2 during measurement. Then, the buoyant platform 2 is placed on the heat transfer medium 7 in the oil bath 6, and the bimetallic temperature control sensor 1 is vertically inserted into the heat transfer medium 7. Then, the laser range finder 4 and the temperature collector 6-1 are connected with the X-Y recorder 5 through the cable 8.

[0052] P2, set the temperature of the heat transfer medium 7 in the oil bath 6 to 0℃, and set the value of the laser range finder 4 to zero after the temperature is stable.

[0053] P3, set the temperature control rate and range of the oil bath 6, for example, set the temperature range to -50℃ to 250℃ and the temperature control rate to 0.1℃ / s.

[0054] P4, start the oil bath 6, the oil bath 6 heats the heat transfer medium 7 in the interior according to the set rate, and the X-Y recorder 5 synchronously records the temperature parameter collected by the temperature collector 6-1 and the stroke parameter measured by the laser range finder 4, and the measurement does not need to be intervened by personnel, realizing automatic measurement.

[0055] P5, when the heat transfer medium 7 in the oil bath 6 reaches the set highest temperature, wait for a set time, the set time is 1 minute, then close the oil bath 6, and the test is completed.

[0056] The X-Y recorder 5 automatically generates an X-Y curve, the X-axis of which is temperature and the Y-axis of which is stroke. The X-Y curve generated by the X-Y recorder 5 can be downloaded and stored for comparison of the parameter performance of the bimetallic temperature control sensor 1, to determine whether the bimetallic temperature control sensor 1 has a performance attenuation trend or other hidden faults.

[0057] The above embodiments of the present application are not intended to limit the protection scope of the present application, and the embodiments of the present application are not limited thereto. According to the above content of the present application, other various forms of modifications, replacements or changes to the above structure of the present application, which are made without departing from the above basic technical idea of the present application, should fall within the protection scope of the present application.

Claims

1. A performance measurement device for a bimetallic temperature control sensor in an aircraft bleed air system, characterized in that: The device includes a buoyancy platform, a laser rangefinder, a fixed base, an XY recorder, and an oil bath containing a heat transfer medium. The oil bath can control the temperature of the internal heat transfer medium and is equipped with a temperature acquisition device that collects the temperature of the internal heat transfer medium. The buoyancy platform floats on the heat transfer medium inside the oil bath and has a mounting hole in its center. The fixed base is located on top of the buoyancy platform, and the laser rangefinder is located on top of the fixed base. During measurement, a bimetallic temperature control sensor is located below the buoyancy platform. The connector of the bimetallic temperature control sensor passes through the mounting hole and is threadedly connected to the fixed base. The travel of the nickel-steel actuating rod of the bimetallic temperature control sensor is obtained through the measurement of the laser rangefinder. The signal output terminals of the laser rangefinder and the temperature acquisition device are both electrically connected to the signal input terminal of the XY recorder.

2. The bimetallic temperature control sensor performance measurement device for an aircraft bleed air system according to claim 1, characterized in that: The mounting base is cylindrical in shape. The lower end of the mounting base is open and has an internal thread, which can be threadedly connected to the connector of the bimetallic temperature control sensor. The upper end of the mounting base has a through hole. The laser rangefinder is installed on the upper end of the mounting base, and the measuring end of the laser rangefinder extends into the mounting base through the through hole.

3. The bimetallic temperature control sensor performance measurement device for an aircraft bleed air system according to claim 1, characterized in that: The buoyancy platform is flat and has an internal cavity.

4. The bimetallic temperature control sensor performance measurement device for an aircraft bleed air system according to claim 3, characterized in that: The buoyancy platform is made of high-temperature resistant plastic material.

5. The bimetallic temperature control sensor performance measurement device for an aircraft bleed air system according to claim 1, characterized in that: The heat transfer medium is silicone oil or thermal oil.

6. The bimetallic temperature control sensor performance measurement device for an aircraft bleed air system according to claim 1, characterized in that: The oil bath tank controls the temperature of the internal heat transfer medium within a range of -50°C to 250°C.

7. A measurement method for measuring a bimetallic temperature control sensor using the bimetallic temperature control sensor performance measurement device according to any one of claims 1 to 6, characterized in that, Includes the following steps: P1. Install the bimetallic temperature sensor to be measured onto the buoyancy platform through the fixed base, install the laser rangefinder, and then place the buoyancy platform on the heat transfer medium in the oil bath. Connect the laser rangefinder and temperature acquisition device to the XY recorder cables respectively; P2, set the temperature of the heat transfer medium in the oil bath to 0℃, and after the temperature stabilizes, set the value of the laser rangefinder to zero. P3, set the temperature control rate and range of the oil bath; P4, start the oil bath tank, and the XY recorder synchronously records the temperature parameters collected by the temperature acquisition device and the travel parameters measured by the laser rangefinder; P5. After the heat transfer medium in the oil bath reaches the set maximum temperature, wait for the set time, then close the oil bath to complete the test.

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