A portable frying oil acid value real-time monitoring device based on an electronic nose

Abstract

This utility model relates to the field of oil acid value monitoring, and in particular to a portable real-time acid value monitoring device for frying oil based on an electronic nose. The portable real-time acid value monitoring device for frying oil based on an electronic nose includes: a display screen for displaying acid value values, a gas path system, a gas pump, an odor sensor module for detecting volatile organic compounds emitted from the frying oil, and an MCU processor. The advantages of this utility model are: it eliminates the need for immersion in the oil for detection, achieving acid value detection by detecting the gases emitted from the frying oil. It provides a portable device for detecting oil acid value based on gas, facilitating control over oil change timing, avoiding safety issues caused by delayed oil changes, improving the safety of frying oil use, preventing waste from premature oil changes, and reducing enterprise production costs.

Description

Technical Field

[0001] This utility model relates to the field of oleic acid value monitoring, and in particular to a portable real-time monitoring device for the acid value of frying oil based on an electronic nose. Background Technology

[0002] Currently, the quality monitoring of frying oil mainly relies on traditional chemical testing methods and laboratory instrument testing. Traditional chemical testing methods require 4-6 hours per test and must be completed by professionals in a laboratory. Some companies use colorimetric test strips for initial screening, but this method has low accuracy and cannot quantify key indicators. Laboratory instrument testing uses equipment such as GC (gas chromatography) and HPLC to accurately analyze the quality of frying oil, but the equipment is expensive and only suitable for third-party testing institutions.

[0003] The main drawback is: 1) Low detection efficiency and poor timeliness: Traditional chemical methods take 4-6 hours, and the accuracy of test strip methods is insufficient, resulting in a "detection gap" for oil products, making it impossible to provide real-time warnings of the risk of excessive acid value.

[0004] 2) Portability and cost issues: Laboratory instruments are expensive and bulky, and commercial electronic noses are large and weigh more than 10kg, making them difficult to deploy in kitchens, restaurants and other similar locations.

[0005] 3) Lack of intelligent decision support: The existing electronic nose only realizes data collection and does not integrate intelligent algorithms. It requires human experience to judge when to change the oil, resulting in more than 20% of oil being wasted or overused due to premature disposal or overuse, or causing safety risks.

[0006] 4) Data isolation: Existing equipment lacks wireless communication modules such as Wi-Fi / Bluetooth, and detection data cannot be uploaded to the value management platform in real time, making it difficult to achieve multi-terminal collaboration. Utility Model Content

[0007] The purpose of this invention is to provide a portable real-time monitoring device for the acid value of frying oil based on an electronic nose, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: A portable real-time monitoring device for the acid value of frying oil based on an electronic nose includes: a display screen for displaying acid value values, an air circuit system, a gas pump, an odor sensor module for detecting volatile organic compounds volatilized from the frying oil, and an MCU processor; One end of the gas path system is equipped with a detection probe with an air inlet; the gas pump draws in the gas above the oil sample to be tested through the air inlet of the detection probe, and transmits it to the odor sensor module through the gas path system. The odor sensor module consists of a metal oxide gas sensor array; the metal oxide gas sensor array detects volatile organic compounds and generates resistance change signals; the MCU processor converts the resistance change signals of the metal oxide gas sensor array into acid values ​​and displays them on the screen.

[0009] As a further embodiment of this utility model: a portable real-time monitoring device for the acid value of frying oil based on an electronic nose also includes: a housing; a gas pump, an odor sensor module and an MCU processor are disposed inside the housing.

[0010] As a further embodiment of this utility model: a portable real-time monitoring device for the acid value of frying oil based on an electronic nose further includes: a main control board; an MCU processor is set on the main control board; the main control board is provided with a signal amplification circuit for amplifying the resistance change signal of the metal oxide gas sensor array; the signal amplification circuit amplifies the resistance change signal of the metal oxide gas sensor array and transmits it to the MCU processor; the MCU processor converts the resistance change signal of the metal oxide gas sensor array amplified by the signal amplification circuit into an acid value.

[0011] As a further embodiment of this invention: a Bluetooth module is provided on the main control board or the MCU processor uses a chip with Bluetooth functionality.

[0012] As a further embodiment of this utility model: a portable real-time monitoring device for the acid value of frying oil based on an electronic nose also includes: a battery system; the battery system powers the gas pump, the odor sensor module and the MCU processor; the battery system is located inside the casing.

[0013] As a further embodiment of this invention: a metal oxide gas sensor array is installed inside the detection probe.

[0014] As a further embodiment of this invention, a stainless steel filter screen is provided at the air inlet of the detection probe.

[0015] As a further embodiment of this utility model: the sensors of the metal oxide gas sensor array include TGS2602 gas sensor, TGS822 gas sensor, TGS813 gas sensor, and TGS825 gas sensor.

[0016] As a further aspect of this utility model: the gas path system is equipped with an integrated flow sensor for detecting the gas flow rate in the gas path system and a solenoid valve for controlling the gas flow rate in the gas path system; the integrated flow sensor controls the solenoid valve based on the detected gas flow rate.

[0017] As a further aspect of this utility model, the gas path system is provided with two-stage filtration: the first stage filtration is a PTFE hydrophobic membrane, and the second stage filtration is an activated carbon layer.

[0018] The advantages of this invention are: it eliminates the need for immersion in oil for testing, achieving acid value detection by detecting the gases emitted from the frying oil. It provides a portable device for detecting oil acid value based on gas, facilitating control over oil change timing, avoiding safety issues caused by delayed oil changes, improving the safety of frying oil use, preventing waste from premature oil changes, and reducing enterprise production costs.

[0019] It can detect oleic acid value on-site without the need for samples to be taken to a laboratory. This is more efficient than traditional chemical testing methods. The equipment is portable, making it easy to deploy in kitchens, restaurants, and other similar locations.

[0020] It can monitor the acid value of oil and automatically determine the current acid value status to guide oil replacement, avoiding the need for manual experience to judge the timing of oil replacement, which could lead to more than 20% of oil being wasted or overused due to premature disposal or safety risks.

[0021] Data can be transmitted via Bluetooth or Wi-Fi module and uploaded to the management platform for convenient management.

[0022] Other features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a portable real-time monitoring device for the acid value of frying oil based on an electronic nose, according to this utility model. Figure 2 yes Figure 1 Internal structural perspective view of a portable real-time monitoring device for acid value of frying oil based on an electronic nose; Figure 3 yes Figure 1 A perspective view of the internal structure of the detection probe of a portable real-time monitoring device for the acid value of frying oil based on an electronic nose.

[0024] List of reference numerals in the attached diagram: 100, portable real-time monitoring device for acid value of frying oil based on electronic nose; 1, display screen; 2, gas system; 3, gas pump; 4, odor sensor module; 5, detection probe; 51, stainless steel filter; 6, battery system; 7, housing; 8, main control board. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figures 1 to 3 As shown, a portable real-time acid value monitoring device 100 for frying oil based on an electronic nose includes: a display screen 1 for displaying acid value values, an air circuit system 2, a gas pump 3, an odor sensor module 4 for detecting volatile organic compounds volatilized from frying oil, and an MCU processor.

[0027] One end of the gas path system 2 is equipped with a detection probe 5 with an air inlet. The gas pump 3 draws in the gas above the oil sample to be tested through the air inlet of the detection probe 5, and transmits it to the odor sensor module 4 through the gas path system 2.

[0028] Odor sensor module 4 consists of a metal oxide (MOX) sensor array. The MOX gas sensor array detects the resistance change signal generated by volatile organic compounds. The MCU processor converts the resistance change signal of the MOX gas sensor array into an acid value, which is then displayed on display screen 1.

[0029] In a preferred embodiment, the display screen 1 is a touch-screen LCD. The display screen 1 can display the detection curve and equipment status information. The gas pump 3 is a miniature diaphragm pump that actively draws in the gas to be tested into the gas path system 2.

[0030] As a specific implementation, a portable real-time acid value monitoring device 100 for frying oil based on an electronic nose further includes: a housing 7. A gas pump 3, an odor sensor module 4, and an MCU processor are housed within the housing 7. A display screen 1 is mounted on the housing 7. The housing 7 has a main power switch to control the start and stop of the device. Physical buttons can also be installed on the housing 7 as needed. Control is achieved through these buttons. Each button includes a keycap and a microswitch. Pressing the keycap triggers the microswitch. The keycap is made of silicone, and symbols such as "+" and "-" can be engraved on its surface. The microswitch is a surface-mount type. Each button includes at least one control button. The control logic of the control button is as follows: a short press (≤1 second) switches the acid value unit on the display screen 1; a long press (≥3 seconds) enters the threshold setting mode; a double-click starts the sensor calibration program, and the display screen 1 displays "Calibration in progress".

[0031] Multi-functional trigger logic: Short press (≤1 second): Switch the acid value unit on the display; Long press (≥3 seconds): Enter the threshold setting mode; Double-click to start the sensor calibration program, and the screen displays "Calibration in progress".

[0032] As one specific implementation, a portable real-time acid value monitoring device 100 for frying oil based on an electronic nose further includes: a main control board 8. An MCU processor is mounted on the main control board 8. The main control board 8 is equipped with a signal amplification circuit for amplifying the resistance change signal from the metal oxide gas sensor array. The signal amplification circuit amplifies the resistance change signal from the metal oxide gas sensor array and transmits it to the MCU processor. The MCU processor converts the amplified resistance change signal from the metal oxide gas sensor array into an acid value.

[0033] In one specific implementation, the main control board 8 is equipped with a Bluetooth module, or the MCU processor uses a chip with Bluetooth functionality. In a preferred implementation, the MCU processor uses an STM32F407 chip with a built-in 12-bit ADC module and a sampling frequency of 1kHz. The signal amplification circuit uses an AD623 amplifier circuit. The main control board 8 integrates a temperature and humidity sensor to compensate for environmental interference in real time. In another specific implementation, a Wi-Fi module can also be included for data transmission.

[0034] As one specific implementation, a portable real-time monitoring device 100 for the acid value of frying oil based on an electronic nose further includes a battery system 6. The battery system 6 powers the gas pump 3, the odor sensor module 4, and the MCU processor. The battery system 6 is located within the housing 7. The battery system 6 uses a rechargeable lithium battery, supporting continuous operation for more than 10 hours.

[0035] A portable real-time acid value monitoring device 100 for frying oil based on an electronic nose also includes a speaker. The speaker is used to play detection information, such as issuing a prompt tone like "oil needs to be replaced" when the acid value exceeds the standard.

[0036] In one specific implementation, a metal oxide (MOX) gas sensor array is installed inside the detection probe 5.

[0037] In one specific implementation, a stainless steel filter 51 is installed at the air inlet of the detection probe 5. The stainless steel filter 51 is used to intercept large particles of oil mist. The air inlet of the detection probe 5 is made of conical polycarbonate with an inner diameter of 5mm. A gas testing chamber is formed inside the detection probe 5. The gas testing chamber is a cylindrical aluminum alloy cavity with a diameter of 30mm, and the inner wall is coated with polytetrafluoroethylene (PTFE) to reduce gas adhesion. A flow guide baffle is provided in the center of the cavity to evenly distribute the airflow to the surrounding sensor area.

[0038] The metal oxide gas sensor array consists of multiple gas sensors. Specifically, multiple gas sensors are distributed around the gas test chamber. The gas sensors are fixed by slots. The sensor surface is covered with an oleophobic nano-coating to prevent oil adhesion. The sensors in the metal oxide gas sensor array include the TGS2602, TGS822, TGS813, and TGS825 gas sensors. The signal transmission line uses a flexible FPC cable. One end is soldered to the sensor pin, and the other end is connected to the wiring port. The cable is wrapped with a high-temperature resistant silicone sheath to prevent signal interference. The signal transmission line can be independent of the gas path system 2, or it can be integrated into the components that constitute the airflow channel of the gas path system 2, such as a flexible hose forming the airflow channel and the signal transmission line being wrapped in the hose wall. The flexible hose can be designed with a quick-release snap structure for easy insertion and removal, and the connection is sealed with O-ring silicone seals. The signal transmission line can also be equipped with corresponding plug-in terminals. The flexible hose also reduces vibration transmission from the gas pump 3.

[0039] In one specific implementation, the gas path system 2 consists of multiple gas channels. These channels connect the air inlet to the odor sensor module 4, the odor sensor module 4 to the gas pump 3, and the gas exhaust channel to the air lift pump 3.

[0040] In one specific implementation, the gas path system 2 is equipped with an integrated flow sensor for detecting the gas flow rate in the gas path system 2 and a solenoid valve for controlling the gas flow rate in the gas path system 2. The integrated flow sensor controls the solenoid valve based on the detected gas flow rate.

[0041] As one specific implementation, the gas path system 2 is equipped with two-stage filtration: the first stage filtration is a PTFE hydrophobic membrane, and the second stage filtration is an activated carbon layer.

[0042] The flow rate of the airlift pump 3 is 0.1-1.0L / min, and the power is ≤2W. The flow rate is dynamically adjusted through a PID algorithm.

[0043] Working Principle: Gas pump 3 draws in gas above the oil sample through the inlet of detection probe 5, and transmits it to odor sensor module 4 via gas path system 2. The metal oxide gas sensor array detects volatile organic compounds, generating a resistance change signal. The MCU processor converts the resistance change signal from the metal oxide gas sensor array into an acid value, which is displayed on display screen 1. The MCU processor's built-in algorithm (PCA-LDA model) converts the signal into an acid value. Real-time Feedback: Acid value data is displayed on display screen 1 in real time. If it exceeds a preset threshold (AV≥4.5 mg / g), the speaker triggers an alarm, and a warning icon flashes on the screen.

[0044] Workflow: Power-on Preheating: Press the power switch. The odor sensor module 4 will automatically preheat for 30 seconds, and the display screen 1 will show the "Ready" status. Sampling and Detection: Place the device's inlet close to the surface of the frying oil. The gas pump 3 will start, and gas collection and analysis will be completed within 10 seconds. Result Output: The display screen 1 shows the real-time acid value and historical trend graph. Users can switch units or save data using buttons. Early Warning Linkage: If the detected value exceeds the standard, a voice alarm will prompt to replace the oil. Simultaneously, the data can be uploaded to the cloud platform via the wireless module.

[0045] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A portable real-time monitoring device for the acid value of frying oil based on an electronic nose (100), characterized in that, include: Display screen (1) for displaying acid value, gas system (2), gas pump (3), odor sensor module (4) for detecting volatile organic compounds volatilized from frying oil, and MCU processor; One end of the gas path system (2) is provided with a detection probe (5) with an air inlet; the gas pump (3) draws in the gas above the oil sample to be tested through the air inlet of the detection probe (5) and transmits it to the odor sensor module (4) through the gas path system (2). The odor sensor module (4) consists of a metal oxide gas sensor array; the metal oxide gas sensor array detects volatile organic compounds and generates a resistance change signal; the MCU processor converts the resistance change signal of the metal oxide gas sensor array into an acid value and displays it on the display screen (1).

2. The portable real-time monitoring device for acid value of frying oil based on an electronic nose (100) according to claim 1, characterized in that, The portable real-time monitoring device for acid value of frying oil based on an electronic nose (100) further includes: a housing (7); The gas pump (3), the odor sensor module (4), and the MCU processor are housed within the casing (7).

3. The portable real-time monitoring device for acid value of frying oil based on an electronic nose (100) according to claim 2, characterized in that, The portable real-time monitoring device for acid value of frying oil based on an electronic nose (100) also includes: a main control board (8); The MCU processor is located on the main control board (8); The main control board (8) is provided with a signal amplification circuit for amplifying the resistance change signal of the metal oxide gas sensor array; The signal amplification circuit amplifies the resistance change signal of the metal oxide gas sensor array and transmits it to the MCU processor; the MCU processor converts the amplified resistance change signal of the metal oxide gas sensor array into an acid value.

4. The portable real-time monitoring device for acid value of frying oil based on an electronic nose according to claim 3, characterized in that, The main control board (8) is equipped with a Bluetooth module or the MCU processor is a chip with Bluetooth functionality.

5. A portable real-time monitoring device for the acid value of frying oil based on an electronic nose (100) according to claim 2, characterized in that, The portable real-time monitoring device for acid value of frying oil based on an electronic nose (100) also includes: a battery system (6). The battery system (6) powers the gas pump (3), the odor sensor module (4) and the MCU processor; the battery system (6) is located inside the housing (7).

6. A portable real-time monitoring device for the acid value of frying oil based on an electronic nose as described in claim 1, characterized in that, The metal oxide gas sensor array is installed inside the detection probe (5).

7. A portable real-time monitoring device for the acid value of frying oil based on an electronic nose (100) according to claim 6, characterized in that, A stainless steel filter (51) is installed at the air inlet of the detection probe (5).

8. A portable real-time monitoring device for the acid value of frying oil based on an electronic nose according to claim 1, characterized in that, The metal oxide gas sensor array includes TGS2602 gas sensor, TGS822 gas sensor, TGS813 gas sensor, and TGS825 gas sensor.

9. A portable real-time monitoring device for the acid value of frying oil based on an electronic nose (100) according to claim 1, characterized in that, The gas system (2) is equipped with an integrated flow sensor for detecting the gas flow rate in the gas system (2) and a solenoid valve for controlling the gas flow rate in the gas system (2); The integrated flow sensor controls the solenoid valve based on the detected gas flow rate.

10. A portable real-time monitoring device for the acid value of frying oil based on an electronic nose according to claim 1, characterized in that, The gas path system (2) is equipped with two-stage filtration. The first stage of filtration is a PTFE hydrophobic membrane, and the second stage of filtration is an activated carbon layer.

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