Portable a pu oil smell detection device

Abstract

The utility model discloses a portable APU lubricating oil smell detection device, including the casing, install the rechargeable battery, micro -sampling pump, gas sensitive sensing array, control mainboard and touch -sensitive display screen in the casing, the rechargeable battery is connected with micro -sampling pump, gas sensitive sensing array and control mainboard electricity, and gas sensitive sensing array and touch -sensitive display screen all with control mainboard are connected, still be equipped with a gas chamber in the casing, the gas chamber is located below gas sensitive sensing array, and the air inlet of gas chamber is linked with the air outlet pipeline of micro -sampling pump, is equipped with a plurality of with gas sensitive sensor in gas sensitive sensing array one -to -one corresponding air outlet on the upper end of gas chamber, and each air outlet is close to gas sensitive sensor setting, is equipped with a conduit mouth on the casing, and the sampling pipe of micro -sampling pump is stretched and is equipped in the conduit mouth, and the end stretches out the conduit mouth.

Description

Technical Field

[0001] This utility model relates to the field of odor detection, specifically to a portable APU lubricating oil odor detection device. Background Technology

[0002] The Auxiliary Power Unit (APU) is a crucial independent small turbine engine on modern commercial airliners, primarily used to provide electricity and compressed air to the aircraft on the ground and as a backup power source during flight. During operation, the APU's internal lubrication system is responsible for lubricating and cooling the high-speed rotating bearings and gearbox. However, due to factors such as aging seals, minor leaks in pipelines, abnormal bearing wear, or localized overheating, small amounts of lubricating oil may leak into high-temperature areas (such as the compressor or turbine section). At high temperatures, this oil undergoes thermal decomposition and oxidation, producing a complex mixture of gases with a distinctive "burnt" odor. This mixture consists of various hydrocarbons, aldehydes, ketones, alcohols, and other substances. Currently, the identification of this odor primarily involves maintenance personnel approaching the APU's intake or exhaust areas and smelling the odor. This method suffers from limitations in quantifying and specifically identifying the types of substances in the odor, making it impossible to monitor APU health trends and predict potential malfunctions in their early stages.

[0003] To achieve automatic odor identification and quantification, an electronic nose bionic detection technology has emerged in the field of odor detection. This electronic nose can qualitatively and quantitatively identify and analyze the type and concentration of gases. Specifically, Chinese Patent Publication No. 219590262 discloses a portable electronic nose, relating to the field of odor recognition technology. It includes an external metal casing, a display screen on one side inside the casing, a control motherboard mounted on the rear inside the casing, a miniature vacuum pump at the bottom inside the casing, a low-voltage lithium battery above the pump, and a metal oxide array sensor on the side of the casing away from the display screen. This portable electronic nose can simultaneously detect multiple different gases through the metal oxide array sensor and transmit data to a server via 4G and GPS communication antennas, allowing personnel to compare historical data. However, after the gas to be detected enters the casing, it gradually fills the entire casing, resulting in uneven gas concentration distribution in a short period, thus affecting detection accuracy. Simultaneously, the diffusion time of the gas to be detected to the sensor is relatively slow, affecting the sensor's detection efficiency. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the purpose of this utility model is to provide a portable APU lubricating oil odor detection device, which solves the problem that the gas to be detected is unevenly distributed and diffuses slowly after being pumped in by the existing electronic nose, thus affecting the detection efficiency and accuracy.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A portable APU lubricating oil odor detection device includes a housing. Inside the housing are a rechargeable battery, a miniature sampling pump, a gas-sensitive sensor array, a control motherboard, and a touchscreen display. The rechargeable battery is electrically connected to the miniature sampling pump, the gas-sensitive sensor array, and the control motherboard. The gas-sensitive sensor array and the touchscreen display are both connected to the control motherboard. A gas chamber is also provided inside the housing, located below the gas-sensitive sensor array. The gas chamber's inlet is connected to the outlet pipe of the miniature sampling pump. Multiple outlets, each corresponding to a gas sensor in the gas-sensitive sensor array, are located at the upper end of the gas chamber, with each outlet positioned close to a gas sensor. A conduit opening is provided on the housing, through which the sampling tube of the miniature sampling pump extends, with its end extending beyond the conduit opening. By adding a gas chamber inside the casing, the micro-sampling pump, with its sampling tube outlet near the APU compartment's ground exhaust grille 301, initiates gas sampling. The sampled gas enters the gas chamber through the pump's outlet pipe, and once filled, is discharged to the corresponding gas sensors via the outlet at the top of the chamber. Each gas sensor then detects the gas and transmits the data to the control board. The control board processes the data and displays it on a touchscreen display. The addition of the gas chamber confines the gas within it, reducing the overall flow space and allowing for rapid filling with consistent concentration, resulting in improved sensor detection efficiency and accuracy. Furthermore, placing the gas outlet at the top of the chamber facilitates gas exhaust, enabling rapid flow to the gas sensors after filling. With each sensor's sensing surface aligned with the airflow direction, detection efficiency is further enhanced, leading to more accurate results.

[0007] Furthermore, the touch display screen is embedded in the upper surface of the housing, and its upper end protrudes from the upper surface of the housing; the upper surface of the housing is a slope. Thus, the touch display screen is positioned on the upper surface and is angled, making it convenient for inspection personnel to view and operate.

[0008] Furthermore, a handle is rotatably mounted on the upper surface of the housing, with the inner side of the handle engaging the outer edge of the touchscreen display. This handle facilitates carrying the detection device, and its rotatable design allows for easy folding.

[0009] Furthermore, two inclined guide vanes are provided in the air chamber, positioned on the left and right sides at the lower end of the air chamber. These guide vanes alter the shape of the air chamber, making it narrower at the bottom and wider at the top, thus facilitating the rapid and even guidance of gas to the upper part of the air chamber.

[0010] Furthermore, a horizontally arranged partition is fixed inside the housing, with the gas-sensitive sensor array mounted on the lower end face of the partition and the control board mounted on the upper end face of the partition. This partition facilitates the installation of the control board and the gas-sensitive sensor array, as well as the connection between them.

[0011] Furthermore, an exhaust fan is also provided on the back of the housing, and the exhaust fan is electrically connected to the rechargeable battery. In this way, the exhaust fan can dissipate heat from the components inside the housing, and can also expel the gas inside the housing after the test is completed.

[0012] Furthermore, a vibration damping pad is installed at the lower end of the miniature sampling pump. This damping pad prevents vibrations from the miniature sampling pump during operation from being transmitted to the partition plate and affecting the operation of the control board and the gas-sensitive sensor array.

[0013] Furthermore, the gas-sensitive sensor array includes the following gas sensors: a SnO2-based sensor, a ZnO-based sensor, a WO3-based sensor, a Pt-doped SnO2 sensor, an Au-doped SnO2 sensor, and a temperature and humidity sensor. Thus, the SnO2-based sensor is used for alkanes, the ZnO-based sensor for aldehydes and ketones, the WO3-based sensor for sulfides, the Pt-doped SnO2 sensor for aromatic hydrocarbons, the Au-doped SnO2 sensor for low-concentration aldehydes, and the temperature and humidity sensor for temperature and humidity compensation calculations by the main control board. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the portable APU lubricating oil odor detection device in the embodiment;

[0015] Figure 2 This is a front view of the portable APU lubricating oil odor detection device in the embodiment;

[0016] Figure 3 This is a side view of the portable APU lubricating oil odor detection device in the embodiment;

[0017] Figure 4 This is a rear view of the portable APU lubricating oil odor detection device in the embodiment. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0019] It should be noted that similar reference numerals 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. In the description of this utility model, 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 figures, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing this utility model 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 limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "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 utility model based on the specific circumstances.

[0020] like Figures 1-4As shown, the portable APU lubricating oil odor detection device provided in this embodiment includes a housing 1. Inside the housing 1 are installed a rechargeable battery 9 (a rechargeable lithium polymer battery, charged via a USB-C interface), a miniature sampling pump 2, a gas-sensitive sensor array 4, a control motherboard 5, and a touch screen 6. The rechargeable battery 9 is electrically connected to the miniature sampling pump 2, the gas-sensitive sensor array 4, and the control motherboard 5. The gas-sensitive sensor array 4 and the touch screen 6 are both connected to the control motherboard 5. A gas chamber 3 (total) is also provided inside the housing 1. (With a volume of 3-6 ml, made of PTFE or anodized aluminum), the gas chamber 3 is located below the gas-sensitive sensor array 4. The air inlet of the gas chamber 3 is connected to the air outlet of the micro sampling pump 2. Multiple air outlets 32 are provided at the upper end of the gas chamber 3, corresponding one-to-one with each gas sensor 41 in the gas-sensitive sensor array 4. Each air outlet 32 ​​is set close to the gas sensor 41. A conduit port 11 is provided on the housing 1. The sampling tube of the micro sampling pump 2 extends out and passes through the conduit port 11, with its end extending out of the conduit port 11. In this way, after adding a gas chamber 3 inside the housing 1, the micro sampling pump 2 brings the sampling tube opening close to the ground exhaust grille 301 of the APU compartment, and starts the micro sampling pump 2 to sample the gas. The sampled gas enters the gas chamber 3 through the outlet pipe of the micro sampling pump 2. After filling the gas chamber 3, the gas is discharged to the corresponding gas sensor 41 through the outlet 32 ​​at the upper end of the gas chamber 3. At this time, each gas sensor 41 detects the gas and transmits the detection data to the control main board 5. The control main board 5 processes the data and displays the data on the touch screen 6. After adding the gas chamber 3, the gas can only be contained within the gas chamber 3. The overall flow space is reduced, allowing the gas chamber 3 to fill quickly and with a consistent concentration, resulting in better sensor detection efficiency and accuracy. Furthermore, placing the outlet 32 ​​of the gas chamber 3 at the top of the gas chamber 3 facilitates gas discharge. After the gas fills the gas chamber 3, it flows quickly to the gas sensor 41 through the outlet 32. The sensing surfaces of each sensor face the airflow direction, resulting in higher detection efficiency and more accurate detection results.

[0021] In practical implementation, a communication module connected to the control motherboard 5 can be installed inside the housing 1. This communication module can remotely transmit processing information from the control motherboard 5 to the user. Specifically, the control motherboard 5 is used to acquire real-time voltage / resistance / frequency values ​​and temperature and humidity compensation data for each sensor, and to precisely control the temperature of the sensor heaters via PWM signals. In this embodiment, the control motherboard 5 continuously collects resistance change data from each gas sensor 41 within 20 seconds after sampling ends, forming a data matrix. This data matrix is ​​the "digital fingerprint" of the burnt lubricating oil smell.

[0022] For ease of maintenance, an inspection door can be installed on the housing 1. Multiple support legs are provided on the lower end face of the housing 1 to prevent wear on the housing 1.

[0023] like Figure 1As shown, the touch display screen 6 is embedded in the upper surface of the housing 1, and its upper end protrudes from the upper surface of the housing 1; the upper surface of the housing 1 is a slope. In this way, the touch display screen 6 is located on the upper surface and is tilted, which makes it convenient for inspection personnel to view and operate.

[0024] For ease of carrying, a handle 7 is rotatably mounted on the upper surface of the housing 1, and the inner side of the handle 7 is engaged with the outer edge of the touch screen 6. In this way, the handle 7 can facilitate carrying the detection device, and at the same time, the handle 7 is engaged with the touch screen 6 and can be rotated for easy folding.

[0025] like Figure 2 As shown, two inclined guide plates 31 are also provided inside the gas chamber 3, and the guide plates 31 are located on the left and right sides of the lower end of the gas chamber 3. In this way, the guide plates 31 can change the shape of the gas chamber 3, making it narrow at the lower end and wide at the upper end, which makes it easier for the gas to be guided to the upper end of the gas chamber 3 quickly and evenly.

[0026] Furthermore, a horizontally arranged partition 12 is fixed inside the housing 1. The gas-sensitive sensor array 4 is installed on the lower end face of the partition 12, and the control main board 5 is installed on the upper end face of the partition 12. In this way, the partition 12 facilitates the installation of the control main board 5 and the gas-sensitive sensor array 4, and also facilitates the connection between the control main board 5 and the gas-sensitive sensor array 4.

[0027] like Figure 4 As shown, an exhaust fan 8 is also provided on the back of the housing 1. The exhaust fan 8 is electrically connected to the rechargeable battery 9 and is positioned near the air outlet 32 ​​of the air chamber 3. In this way, the exhaust fan 8 can cool the components inside the housing 1 and also expel the gas inside the housing 1 after the test is completed.

[0028] Furthermore, a vibration damping pad (not shown in the figure) is provided at the lower end of the miniature sampling pump 2. In this way, the vibration damping pad under the sampling pump can be prevented from being transmitted to the partition plate 12 during operation, thus avoiding affecting the operation of the control main board 5 and the gas-sensitive sensor array 4.

[0029] Specifically, in this embodiment, the gas-sensitive sensor array 4 includes the following gas-sensitive sensors 41: a SnO2-based sensor, a ZnO-based sensor, a WO3-based sensor, a Pt-doped SnO2 sensor, an Au-doped SnO2 sensor, and a temperature and humidity sensor. Each sensor integrates a miniature heater, enabling rapid temperature modulation under the control of the main board 5. Thus, the SnO2-based sensor is used for alkanes, the ZnO-based sensor for aldehydes and ketones, the WO3-based sensor for sulfides, the Pt-doped SnO2 sensor for aromatic hydrocarbons, the Au-doped SnO2 sensor for low-concentration aldehydes, and the temperature and humidity sensor for temperature and humidity compensation calculations by the main board.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A portable APU lubricating oil odor detection device, comprising a housing, wherein a rechargeable battery, a micro sampling pump, a gas-sensitive sensor array, a control motherboard, and a touch screen are installed inside the housing, wherein the rechargeable battery is electrically connected to the micro sampling pump, the gas-sensitive sensor array, and the control motherboard, and the gas-sensitive sensor array and the touch screen are both connected to the control motherboard; characterized in that, An air chamber is also provided inside the housing, which is located below the gas-sensitive sensor array. The air inlet of the air chamber is connected to the air outlet of the micro sampling pump. Multiple air outlets corresponding to each gas sensor in the gas-sensitive sensor array are provided at the upper end of the air chamber, and each air outlet is set close to the gas sensor. A conduit opening is provided on the housing, and the sampling tube of the micro sampling pump extends out and passes through the conduit opening, with its end extending out of the conduit opening.

2. The portable APU lubricating oil odor detection device according to claim 1, characterized in that, The touch screen is embedded in the upper surface of the housing, and its upper end protrudes from the upper surface of the housing; the upper surface of the housing is a slope.

3. The portable APU lubricating oil odor detection device according to claim 2, characterized in that, A handle is rotatably mounted on the upper end face of the housing, and the inner side of the handle is engaged with the outer edge of the touch screen.

4. The portable APU lubricating oil odor detection device according to claim 1, 2, or 3, characterized in that, Two inclined guide plates are also provided in the air chamber, which are placed on the left and right sides at the lower end of the air chamber.

5. The portable APU lubricating oil odor detection device according to claim 4, characterized in that, A horizontally arranged partition is fixed inside the housing. The gas-sensitive sensor array is installed on the lower end face of the partition, and the control motherboard is installed on the upper end face of the partition.

6. The portable APU lubricating oil odor detection device according to claim 1, 2, 3, or 5, characterized in that, An exhaust fan is also provided on the back of the housing. The exhaust fan is electrically connected to the rechargeable battery and communicatively connected to the control motherboard.

7. The portable APU lubricating oil odor detection device according to claim 6, characterized in that, A shock-absorbing pad is installed at the lower end of the miniature sampling pump.

8. The portable APU lubricating oil odor detection device according to claim 6, characterized in that, The gas-sensitive sensors included in the gas-sensitive sensor array are: SnO2-based sensor, ZnO-based sensor, WO3-based sensor, Pt-doped SnO2 sensor, Au-doped SnO2 sensor, and a temperature and humidity sensor.

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