A calibration device and system for oxygen partial pressure sensors for high altitude environments

Abstract

The application relates to a calibration device and system for an oxygen partial pressure sensor used in high-altitude environment, and relates to the field of measurement. The calibration device for the oxygen partial pressure sensor used in high-altitude environment comprises a sealed container for accommodating a measured oxygen partial pressure sensor, an oxygen cylinder, at least one inert gas cylinder, a vacuum pump, a first pressure gauge and an upper computer connected with the measured oxygen partial pressure sensor; the oxygen cylinder is connected with the sealed container through a pipeline provided with an oxygen supply switch; the inert gas cylinder is connected with the sealed container through a pipeline provided with an inert gas switch; the vacuum pump is connected with the sealed container through a pipeline provided with a vacuum switch; the first pressure gauge is used for detecting the pressure in the sealed container; and the upper computer is used for reading the oxygen partial pressure value detected by the measured oxygen partial pressure sensor. The calibration device and system for the oxygen partial pressure sensor used in high-altitude environment can create a standard oxygen partial pressure environment to simulate the actual use condition of the oxygen partial pressure sensor of a pressurized oxygen supply mask, and can accurately control the size of the standard oxygen partial pressure to improve the calibration precision of the measured oxygen partial pressure.

Description

Technical Field

[0001] This application relates to the field of measurement, and more specifically, to a calibration device and system for an oxygen partial pressure sensor used in high-altitude environments. Background Technology

[0002] For pilots flying at high altitudes, the partial pressure of oxygen within their breathing masks is not constant. Excessively low oxygen partial pressure can not only affect the pilot's health but also cause serious consequences such as suffocation, and even lead to air crashes. To assess the partial pressure of oxygen within the mask cavity in real time under different conditions and missions, an oxygen partial pressure sensor needs to be installed inside the pilot's mask to monitor and measure the oxygen supply status in real time. This sensor can then promptly alert the pilot when oxygen supply is insufficient, preventing flight accidents caused by hypoxia and ensuring flight safety.

[0003] To more accurately assess and warn of pilot hypoxia, the testing accuracy of oxygen partial pressure sensors is crucial. Current oxygen partial pressure sensor calibration systems are performed under ground conditions using dynamic gas mixing, typically requiring 3-5 standard gases with oxygen concentrations ranging from 0-100%. The calibration results are insufficient for practical applications, and this method is primarily designed for calibrating oxygen partial pressure sensors used under ground conditions, failing to meet the calibration requirements for oxygen partial pressure sensors operating at high altitudes. Utility Model Content

[0004] The purpose of this application is to provide a calibration device and system for an oxygen partial pressure sensor in a high-altitude environment. It simulates the actual working conditions of the oxygen partial pressure sensor in a pressurized oxygen supply mask by creating a standard oxygen partial pressure environment, and accurately controls the magnitude of the standard oxygen partial pressure to improve the calibration accuracy of the measured oxygen partial pressure.

[0005] This application is implemented as follows: This application provides a calibration device for an oxygen partial pressure sensor used in high-altitude environments, comprising: A sealed container for holding the oxygen partial pressure sensor being measured; Oxygen cylinders are connected to sealed containers via pipes equipped with oxygen supply switches; At least one inert gas cylinder is connected to a sealed container via a pipe equipped with an inert gas switch; A vacuum pump is connected to a sealed container via a pipe equipped with a vacuum switch; The first pressure gauge is used to detect the pressure inside the sealed container; The host computer is connected to the oxygen partial pressure sensor inside the sealed container to read the oxygen partial pressure value detected by the sensor.

[0006] In some alternative implementations, a first solenoid valve is provided on the pipeline between the oxygen cylinder and the sealed container.

[0007] In some alternative implementations, a second solenoid valve is provided on the pipeline between the inert gas cylinder and the sealed container.

[0008] In some alternative implementations, a third solenoid valve is provided on the piping between the vacuum pump and the sealed container.

[0009] In some alternative implementations, a buffer chamber is isolated inside the sealed container. The buffer chamber has an opening communicating with the interior of the sealed container, a first sealed door that can be moved to open and close the opening, and a first opening and closing mechanism for driving the first sealed door to move. The sealed container has an operating port communicating with the buffer chamber and a second sealed door for opening and closing the operating port. An inert gas cylinder is connected to the buffer chamber through a pipe equipped with an inert gas switch, and a vacuum pump is connected to the buffer chamber through a pipe equipped with a fourth solenoid valve.

[0010] In some alternative implementations, the second sealing door is connected to a second opening and closing mechanism for driving the second sealing door to move and open / close the operating port.

[0011] In some alternative implementations, the sealed container is connected to a second pressure gauge for detecting the pressure in the buffer chamber.

[0012] In some alternative implementations, the oxygen cylinder contains oxygen with a concentration of 99.99% or higher.

[0013] In some alternative implementations, at least one inert gas cylinder contains nitrogen.

[0014] This application also provides a calibration system for an oxygen partial pressure sensor for high-altitude environments, which includes the above-described calibration device for an oxygen partial pressure sensor for high-altitude environments.

[0015] The beneficial effects of this application are as follows: The calibration device for an oxygen partial pressure sensor in a high-altitude environment provided by this application includes a sealed container for accommodating the oxygen partial pressure sensor under test, an oxygen cylinder, at least one inert gas cylinder, a vacuum pump, a first pressure gauge, and a host computer connected to the oxygen partial pressure sensor under test; the oxygen cylinder is connected to the sealed container through a pipe equipped with an oxygen supply switch; the inert gas cylinders are respectively connected to the sealed container through pipes equipped with inert gas switches; the vacuum pump is connected to the sealed container through a pipe equipped with a vacuum switch; the first pressure gauge is used to detect the pressure inside the sealed container; and the host computer is used to read the oxygen partial pressure value detected by the oxygen partial pressure sensor under test. The calibration device and system for an oxygen partial pressure sensor in a high-altitude environment provided by this application create a standard oxygen partial pressure environment by adjusting the standard gas pressure inside the sealed container after cleaning it, thereby simulating the actual operating conditions of the oxygen partial pressure sensor in a pressurized oxygen supply mask, and accurately controlling the magnitude of the standard oxygen partial pressure to improve the calibration accuracy of the oxygen partial pressure under test. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the calibration device for the oxygen partial pressure sensor in the high-altitude environment provided in Embodiment 1 of this application; Figure 2 A schematic diagram of the process for testing the calibration device for the oxygen partial pressure sensor for high-altitude environments provided in Embodiment 1 of this application; Figure 3 The calibration system for the oxygen partial pressure sensor in high-altitude environments provided in Embodiment 1 of this application calculates the oxygen partial pressure test error of the oxygen partial pressure sensor at 0-70 kPa. Figure 4 This is a schematic diagram of the structure of the calibration device for the oxygen partial pressure sensor in the high-altitude environment provided in Embodiment 2 of this application.

[0018] In the diagram: 100, sealed container; 110, oxygen cylinder; 111, first solenoid valve; 120, oxygen supply switch; 130, inert gas cylinder; 131, second solenoid valve; 140, inert gas switch; 150, vacuum pump; 151, third solenoid valve; 152, fourth solenoid valve; 160, vacuum switch; 170, first pressure gauge; 180, host computer; 190, second pressure gauge; 200, oxygen partial pressure sensor; 300, buffer chamber; 310, opening; 320, first sealed door; 330, first opening and closing mechanism; 340, operating port; 350, second sealed door; 360, second opening and closing mechanism. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The following detailed description of the features and performance of the calibration device and system for an oxygen partial pressure sensor in a high-altitude environment according to this application is provided in conjunction with embodiments.

[0027] Example 1 like Figure 1 As shown in the figure, this application provides a calibration device for an oxygen partial pressure sensor in a high-altitude environment, which includes a sealed container 100, an oxygen cylinder 110, an inert gas cylinder 130, a vacuum pump 150, a first pressure gauge 170, and a host computer 180; wherein, the sealed container 100 is used to contain the oxygen partial pressure sensor 200 to be measured; the oxygen cylinder 110 is connected to the sealed container 100 through a pipe equipped with an oxygen supply switch 120 and a first solenoid valve 111; the inert gas cylinder 130 is connected to the sealed container through a pipe equipped with an inert gas switch 140 and a second solenoid valve 131. 100; Vacuum pump 150 is connected to sealed container 100 through a pipe equipped with vacuum switch 160 and third solenoid valve 151; First pressure gauge 170 is connected to sealed container 100 to detect the pressure inside sealed container 100; Host computer 180 is electrically connected to oxygen partial pressure sensor 200 inside sealed container 100 to read the oxygen partial pressure value detected by oxygen partial pressure sensor 200; Inert gas cylinder 130 stores nitrogen gas with a volume percentage of 99.99% or more, and oxygen cylinder 110 stores oxygen gas with a volume percentage of 99.99% or more.

[0028] like Figure 2 As shown in the embodiment of this application, the method of using the calibration device for an oxygen partial pressure sensor in a high-altitude environment is as follows: S100. Place the pressurized oxygen supply mask equipped with the oxygen partial pressure sensor 200 to be measured into the sealed container 100 and connect it to the host computer 180. S200: Turn on vacuum pump 150, vacuum switch 160 and third solenoid valve 151. Use vacuum pump 150 to evacuate sealed container 100 to an absolute pressure of 0.5 kPa, then turn off vacuum pump 150, vacuum switch 160 and third solenoid valve 151. S300: Open the inert gas switch 140 and the second solenoid valve 131 to introduce nitrogen gas with a concentration of 99.99% or higher from the inert gas cylinder 130 into the sealed container 100 until the absolute pressure inside the sealed container 100 is 99.3 kPa, and then close the inert gas switch 140 and the second solenoid valve 131. S310. Turn on vacuum pump 150, vacuum switch 160 and third solenoid valve 151. Use vacuum pump 150 to evacuate sealed container 100 to an absolute pressure of 0.5 kPa, then turn off vacuum pump 150, vacuum switch 160 and third solenoid valve 151. S320. Open the inert gas switch 140 and the second solenoid valve 131 to introduce nitrogen gas with a concentration of 99.99% or higher from the inert gas cylinder 130 into the sealed container 100 until the absolute pressure inside the sealed container 100 is 99.3 kPa. S500: Turn on vacuum pump 150, vacuum switch 160 and third solenoid valve 151. Use vacuum pump 150 to evacuate sealed container 100 to an absolute pressure of 0.5 kPa, then turn off vacuum pump 150, vacuum switch 160 and third solenoid valve 151. S600, Open the oxygen supply switch 120 and the first solenoid valve 111 to introduce oxygen with a concentration of 99.99% or higher from the oxygen cylinder 110 into the sealed container 100, so that the pressure in the sealed container 100 is 15 kPa (standard oxygen partial pressure value), and close the oxygen supply switch 120 and the first solenoid valve 111. S700: Use the host computer 180 to read the oxygen partial pressure value of the oxygen partial pressure sensor 200 under test, and calculate the difference between the oxygen partial pressure value of the oxygen partial pressure sensor 200 under test and the standard oxygen partial pressure value, which is the test error.

[0029] S710. Open the oxygen supply switch 120 and the first solenoid valve 111 to introduce oxygen with a concentration of 99.99% or higher from the oxygen cylinder 110 into the sealed container 100, so that the pressure in the sealed container 100 is 21 kPa (standard oxygen partial pressure value). Close the oxygen supply switch 120 and the first solenoid valve 111. Use the host computer 180 to read the oxygen partial pressure value of the oxygen partial pressure sensor 200 under test. Calculate the difference between the oxygen partial pressure value of the oxygen partial pressure sensor 200 under test and the standard oxygen partial pressure value, which is the test error. S720. Open the oxygen supply switch 120 and the first solenoid valve 111 to introduce oxygen with a concentration of 99.99% or higher from the oxygen cylinder 110 into the sealed container 100, so that the pressure in the sealed container 100 is 30 kPa (standard oxygen partial pressure value). Close the oxygen supply switch 120 and the first solenoid valve 111. Use the host computer 180 to read the oxygen partial pressure value of the oxygen partial pressure sensor 200 under test. Calculate the difference between the oxygen partial pressure value of the oxygen partial pressure sensor 200 under test and the standard oxygen partial pressure value, which is the test error. S730. Open the oxygen supply switch 120 and the first solenoid valve 111 to introduce oxygen with a concentration of 99.99% or higher from the oxygen cylinder 110 into the sealed container 100, so that the pressure in the sealed container 100 is 50 kPa (standard oxygen partial pressure value). Close the oxygen supply switch 120 and the first solenoid valve 111. Use the host computer 180 to read the oxygen partial pressure value of the oxygen partial pressure sensor 200 under test. Calculate the difference between the oxygen partial pressure value of the oxygen partial pressure sensor 200 under test and the standard oxygen partial pressure value, which is the test error. S740: Open the oxygen supply switch 120 and the first solenoid valve 111 to introduce oxygen with a concentration of 99.99% or higher from the oxygen cylinder 110 into the sealed container 100, making the pressure inside the sealed container 100 70 kPa (standard oxygen partial pressure value). Close the oxygen supply switch 120 and the first solenoid valve 111. Use the host computer 180 to read the oxygen partial pressure value of the oxygen partial pressure sensor 200 under test. Calculate the difference between the oxygen partial pressure value of the oxygen partial pressure sensor 200 under test and the standard oxygen partial pressure value, which is the test error. Repeat steps S600 to S700 multiple times, and adjust the pressure inside the sealed container 100 to multiple standard oxygen partial pressure values ​​with gradually increasing pressure each time oxygen is introduced into the sealed container 100 before calculating the test error.

[0030] The oxygen partial pressure test error calculated by the oxygen partial pressure sensor 200 of the pressurized oxygen supply mask at (0-70) kPa is shown in Table 3.

[0031] The calibration device for an oxygen partial pressure sensor in a high-altitude environment provided in this application embodiment places the oxygen partial pressure sensor 200 in a sealed container 100, repeatedly evacuates the sealed container 100 to an absolute pressure of 0-1 kPa, and then introduces nitrogen gas with a concentration of 99.99% to an absolute pressure of 99-101 kPa for cleaning. Subsequently, the sealed container 100 is evacuated to an absolute pressure of 0-1 kPa, and oxygen gas with a concentration of 99.99% is introduced sequentially to multiple standard oxygen partial pressure values ​​with gradually increasing absolute pressures. The display value of the oxygen partial pressure sensor 200 is read by the host computer 180, and the difference between the displayed value and the standard oxygen partial pressure value is calculated, which is the test error of the oxygen partial pressure sensor. By adjusting the standard gas pressure, a standard oxygen partial pressure environment is created, which can simulate the actual working conditions of the oxygen partial pressure sensor. The standard oxygen partial pressure control is relatively accurate, and the oxygen partial pressure sensor can be accurately calibrated.

[0032] Example 2 like Figure 4As shown, this application provides a calibration device for an oxygen partial pressure sensor in a high-altitude environment. Its structure is roughly the same as that of the calibration device for an oxygen partial pressure sensor in a high-altitude environment provided in Embodiment 1. The difference is that in this embodiment, a buffer chamber 300 is formed inside the sealed container 100. The buffer chamber 300 is provided with an opening 310 communicating with the inside of the sealed container 100, a first sealing door 320 movable to open and close the opening 310, and a first opening and closing mechanism 330. The first opening and closing mechanism 330 is used to drive the first sealing door 320 to move to open and close the opening 310. The sealed container 100 is provided with an operation port 340 communicating with the buffer chamber 300 and a second sealing door 350 movable to open and close the operation port 340. The second sealing door 350 is connected to a second opening and closing mechanism 360, which is used to drive the second sealing door 350 to move and open and close the operation port 340. The vacuum pump 150 is connected to the buffer chamber 300 through a pipe equipped with a fourth solenoid valve 152. The inert gas cylinder 130 is connected to the buffer chamber 300 through a pipe equipped with an inert gas switch 140. The sealed container 100 is connected to a second pressure gauge 190 for detecting the pressure of the buffer chamber 300. In this embodiment, the first opening and closing mechanism 330 and the second opening and closing mechanism 360 are electric push rods.

[0033] This application provides a calibration device for an oxygen partial pressure sensor used in high-altitude environments. A buffer chamber 300 is formed within a sealed container 100, and the buffer chamber 300 is connected to the sealed container 100 through an opening 310. The sealed container 100 is also connected to a first sealing door 320 that can be moved and closed via the opening 310, and a first opening and closing mechanism 330 for driving the first sealing door 320. The sealed container 100 is connected to a second pressure gauge 190 for detecting the pressure in the buffer chamber 300. This allows the operator to place the device to be tested during vacuuming and nitrogen purging of the sealed container 100. The oxygen partial pressure sensor 200 is placed in the buffer chamber 300 through the second sealing door 350. The buffer chamber 300 is cleaned by repeatedly evacuating the vacuum chamber 300 and introducing nitrogen gas using the vacuum pump 150 and the inert gas cylinder 130. After the sealed container 100 is cleaned, the first sealing door 320 is moved by the first opening and closing mechanism 330 to open the opening 310, and the oxygen partial pressure sensor 200 in the sealed container 100 is tested. This allows the operator to clean the sealed container 100 in advance and quickly take out and put in the oxygen partial pressure sensor 200 using the buffer chamber 300, thus improving the testing efficiency.

[0034] This application also provides a calibration system for an oxygen partial pressure sensor for high-altitude environments, which includes the above-described calibration device for an oxygen partial pressure sensor for high-altitude environments.

[0035] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A calibration device for an oxygen partial pressure sensor used in high-altitude environments, characterized in that, It includes: A sealed container for holding the oxygen partial pressure sensor being measured; An oxygen cylinder is connected to the sealed container via a pipe equipped with an oxygen supply switch; At least one inert gas cylinder is connected to the sealed container via a pipe equipped with an inert gas switch; A vacuum pump is connected to the sealed container via a pipe equipped with a vacuum switch; A first pressure gauge is used to detect the pressure inside the sealed container; The host computer is connected to the oxygen partial pressure sensor inside the sealed container to read the oxygen partial pressure value detected by the sensor.

2. The calibration device for an oxygen partial pressure sensor in a high-altitude environment according to claim 1, characterized in that, A first solenoid valve is provided on the pipeline between the oxygen cylinder and the sealed container.

3. The calibration device for an oxygen partial pressure sensor in a high-altitude environment according to claim 1, characterized in that, A second solenoid valve is installed on the pipeline between the inert gas cylinder and the sealed container.

4. The calibration device for an oxygen partial pressure sensor in a high-altitude environment according to claim 1, characterized in that, A third solenoid valve is installed on the pipeline between the vacuum pump and the sealed container.

5. The calibration device for an oxygen partial pressure sensor in a high-altitude environment according to claim 1, characterized in that, The sealed container is isolated to form a buffer chamber. The buffer chamber is provided with an opening communicating with the inside of the sealed container, a first sealing door that can be moved to open and close the opening, and a first opening and closing mechanism for driving the first sealing door to move. The outer wall of the sealed container is provided with an operation port communicating with the buffer chamber and a second sealing door for opening and closing the operation port. The inert gas cylinder is connected to the buffer chamber through a pipe equipped with an inert gas switch. The vacuum pump is connected to the buffer chamber through a pipe equipped with a fourth solenoid valve.

6. The calibration device for an oxygen partial pressure sensor in a high-altitude environment according to claim 5, characterized in that, The second sealing door is connected to a second opening and closing mechanism, which is used to drive the second sealing door to move and open / close the operating port.

7. The calibration device for an oxygen partial pressure sensor in a high-altitude environment according to claim 5, characterized in that, The sealed container is connected to a second pressure gauge for detecting the pressure of the buffer chamber.

8. The calibration device for an oxygen partial pressure sensor in a high-altitude environment according to claim 1, characterized in that, The oxygen cylinder contains oxygen with a concentration of 99.99% or higher.

9. The calibration device for an oxygen partial pressure sensor in a high-altitude environment according to claim 1, characterized in that, At least one of the inert gas cylinders contains nitrogen gas with a concentration of 99.99% or higher.

10. A calibration system for an oxygen partial pressure sensor used in high-altitude environments, characterized in that, It includes a calibration device for an oxygen partial pressure sensor for high-altitude environments as described in any one of claims 1 to 9.

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