A method and device for calibrating an oil mist concentration detector

Abstract

This invention discloses a calibration test method and apparatus for an oil mist concentration detector, belonging to the field of mechanical testing. To address the problems of difficult oil mist generation, uneven and unstable dispersion, and low calibration accuracy in oil mist concentration testing within mechanical power units, this invention uses an oil mist generation module to heat lubricating oil to generate oil mist and controls the air intake and flow rate to adjust the concentration. An oil mist concentration testing module uses a vacuum pump to extract the oil mist and calculates the concentration through filter paper absorption. An extinction method testing module measures the extinction degree of the oil mist in a visible area. An oil mist concentration verification module uses a particle concentration and particle size testing instrument to verify and correct the filter paper method concentration. Finally, based on the corrected concentration and extinction degree, the extinction coefficient is calculated to calibrate the oil mist detector. This invention can generate a uniform and stable oil mist dispersion, simulating the actual state of lubricating oil inside mechanical power units, improving testing accuracy and reliability, and is suitable for the development and calibration of oil mist detectors for mechanical power units.

Description

Technical Field

[0001] This invention belongs to the field of mechanical testing technology, and in particular relates to a calibration test method and device for an oil mist concentration detector. Background Technology

[0002] The safety of power machinery is of paramount importance to industrial development. During operation, mechanical power units inevitably generate large amounts of lubricating oil mist, posing an explosion risk. Therefore, accurate monitoring of oil mist concentration is crucial for ensuring the safe operation of mechanical power units. Consequently, domestic and international standards explicitly require high-power engines, gas turbines, and large rotating machinery to be equipped with oil mist detectors to detect the concentration of generated oil mist, with measurement accuracy meeting specific standards. This places stringent requirements on the performance of oil mist detectors.

[0003] In the prior art, invention patent CN202210939081.6 uses a filter paper sampling method to measure oil mist concentration. However, this method is prone to oil mist sticking to the filter paper during sampling, resulting in large measurement errors and insufficient accuracy. Invention patent CN202111117870.3 applies a dust detector to oil mist concentration detection by calibrating the K-coefficient of oil mist concentration detection; however, this method is not applicable to the operating environments of various mechanical power devices. Patent CN202123318996.5 uses an optical method to compare measurements with two sets of monitoring devices to eliminate airflow errors and improve measurement accuracy; however, this scheme is difficult to provide the necessary calibration data for the development of oil mist detectors based on optical principles.

[0004] These existing technologies have failed to effectively address the issues of uniformity and stability in the preparation of oil mist dispersions within mechanical power units, nor can they provide a complete calibration test scheme. In practical applications, oil mist detectors need to maintain measurement accuracy under complex operating conditions. However, existing technologies either have inherent errors in the measurement methods themselves, cannot simulate the actual oil mist state inside mechanical power units, or cannot provide a reliable calibration basis for detector development. Therefore, developing a test system capable of generating uniform and stable oil mist dispersions and achieving accurate calibration is particularly important, and this is a technical challenge that must be solved in the process of achieving the localization of oil mist detectors. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a calibration test method and apparatus for an oil mist concentration detector, thereby resolving the issues present in the prior art.

[0006] Firstly, to achieve the above objectives, the present invention provides a calibration test method for an oil mist concentration detector, comprising the following steps:

[0007] Oil mist is generated, and the oil mist concentration is adjusted by controlling the air intake and airflow rate;

[0008] The oil mist is extracted and absorbed through filter paper to calculate the oil mist concentration.

[0009] The extinction of the oil mist was measured in the visual test area;

[0010] The oil mist concentration was verified and corrected using a particle size and concentration testing instrument.

[0011] The extinction coefficient is calculated based on the corrected oil mist concentration and extinction to calibrate the oil mist detector.

[0012] Optionally, the process of generating oil mist and adjusting the oil mist concentration by controlling the air intake and airflow rate includes:

[0013] The lubricating oil inside the high-temperature resistant container is heated by a heating device to generate oil mist;

[0014] Introduce oil mist into a semi-enclosed device;

[0015] The concentration of oil mist is controlled by adjusting the amount of air entering and the airflow rate.

[0016] Optionally, the process of extracting oil mist and absorbing it through filter paper to calculate the oil mist concentration includes:

[0017] Use a vacuum pump to extract oil mist;

[0018] The extraction volume is controlled by a flow meter;

[0019] Use filter paper to absorb oil mist and measure the mass difference before and after absorption;

[0020] The oil mist concentration is calculated based on the extracted volume.

[0021] Optionally, the process of measuring the extinction of oil mist in the visualization test area includes:

[0022] Set up the laser and power meter in the visualization test area;

[0023] Measure the laser power when oil mist has not yet formed and when it has already formed;

[0024] Extinction is calculated based on power attenuation.

[0025] Optionally, the process of verifying and correcting the oil mist concentration using a particle size analyzer includes:

[0026] Extract oil mist samples from the visualized test area;

[0027] The sample is passed through a particle size analyzer to measure the oil mist concentration.

[0028] Compare the particle concentration and particle size measurement results with the filter paper method;

[0029] Correct the oil mist concentration obtained by the filter paper method.

[0030] Optionally, the process of calculating the extinction coefficient based on the corrected oil mist concentration and extinction degree includes:

[0031] Applying the Lambert-Beer law, the extinction coefficient was determined based on the extinction degree, the corrected oil mist concentration, and the laser calibration.

[0032] Secondly, the present invention also provides a calibration test apparatus for an oil mist concentration detector, used to implement a calibration test method for an oil mist concentration detector, the apparatus comprising:

[0033] An oil mist generation module is used to generate oil mist and adjust the oil mist concentration by controlling the air intake and air flow rate.

[0034] The oil mist concentration testing module is used to extract oil mist and absorb it through filter paper to calculate the oil mist concentration.

[0035] The extinction method test module is used to measure the extinction degree of oil mist in a visual test area;

[0036] An oil mist concentration verification module is used to verify and correct the oil mist concentration using a particle concentration and particle size testing instrument.

[0037] The calculation module is used to calculate the extinction coefficient based on the corrected oil mist concentration and extinction to calibrate the oil mist detector.

[0038] Thirdly, the present invention also provides a computer terminal device, comprising:

[0039] One or more processors;

[0040] A memory, coupled to the processor, for storing one or more programs;

[0041] When the one or more programs are executed by the one or more processors, the one or more processors implement the steps of the oil mist concentration detector calibration test method in the first aspect described above.

[0042] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of the oil mist concentration detector calibration test method in the first aspect described above are implemented.

[0043] Fifthly, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the oil mist concentration detector calibration test method described in the first aspect.

[0044] Compared with the prior art, the present invention has the following advantages and technical effects:

[0045] This invention provides a calibration test method for an oil mist concentration detector. This invention can generate a uniform and stable oil mist dispersion system, simulating the actual oil mist state within a mechanical power unit, effectively solving the problems of difficulty in oil mist generation and instability of the dispersion system in existing technologies. By combining the extinction method, filter paper method, and particle concentration verification module, it achieves multi-method collaborative measurement and mutual verification of oil mist concentration, significantly improving the accuracy and reliability of oil mist concentration measurement. This system can provide accurate extinction coefficient calibration for oil mist detectors based on the extinction method, solving the problem that existing optical measurement methods cannot effectively support the research and calibration of oil mist detectors. This invention is applicable to the development and calibration tests of oil mist detectors for various mechanical power units, providing an effective experimental basis for the accurate testing of lubricating oil mist concentration in mechanical power units. Attached Figure Description

[0046] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0047] Figure 1 This is a schematic diagram of the oil mist dispersion measurement method according to an embodiment of the present invention;

[0048] Figure 2 This is a flowchart of the calibration test for the oil mist concentration detector according to an embodiment of the present invention.

[0049] Reference numerals in the attached diagram: 1. Air intake adjustment platform; 2. Heating furnace; 3. Lubricating oil to be tested; 4. High-temperature resistant stainless steel container; 5. Acrylic cover; 6. Acrylic flow equalizer; 7. First stainless steel flow equalizer; 8. Laser; 9. Sampling hole; 10. Second stainless steel flow equalizer; 11. Optical power meter; 12. Filter paper; 13. Sampling pipeline; 14. Flow meter; 15. Vacuum pump. Detailed Implementation

[0050] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0051] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0052] Example 1

[0053] This embodiment provides a calibration test method for an oil mist concentration detector, including:

[0054] Oil mist is generated, and the oil mist concentration is adjusted by controlling the air intake and airflow rate;

[0055] The oil mist is extracted and absorbed through filter paper to calculate the oil mist concentration.

[0056] The extinction of the oil mist was measured in the visual test area;

[0057] The oil mist concentration was verified and corrected using a particle size and concentration testing instrument.

[0058] The extinction coefficient is calculated based on the corrected oil mist concentration and extinction to calibrate the oil mist detector.

[0059] As one implementation method in this embodiment, the process of generating oil mist and adjusting the oil mist concentration by controlling the air intake and airflow rate includes:

[0060] The lubricating oil inside the high-temperature resistant container is heated by a heating device to generate oil mist;

[0061] Introduce oil mist into a semi-enclosed device;

[0062] The concentration of oil mist is controlled by adjusting the amount of air entering and the airflow rate.

[0063] As one implementation method in this embodiment, the process of extracting oil mist and absorbing it through filter paper to calculate the oil mist concentration includes:

[0064] Use a vacuum pump to extract oil mist;

[0065] The extraction volume is controlled by a flow meter;

[0066] Use filter paper to absorb oil mist and measure the mass difference before and after absorption;

[0067] The oil mist concentration is calculated based on the extracted volume.

[0068] As one implementation method in this embodiment, the process of measuring the extinction degree of oil mist in the visualization test area includes:

[0069] Set up the laser and power meter in the visualization test area;

[0070] Measure the laser power when oil mist has not yet formed and when it has already formed;

[0071] Extinction is calculated based on power attenuation.

[0072] As one implementation method in this embodiment, the process of verifying and correcting the oil mist concentration using a particle concentration and particle size testing instrument includes:

[0073] Extract oil mist samples from the visualized test area;

[0074] The sample is passed through a particle size analyzer to measure the oil mist concentration.

[0075] Compare the particle concentration and particle size measurement results with the filter paper method;

[0076] Correct the oil mist concentration obtained by the filter paper method.

[0077] As one implementation method in this embodiment, the process of calculating the extinction coefficient based on the corrected oil mist concentration and extinction degree includes:

[0078] Applying the Lambert-Beer law, the extinction coefficient was determined based on the extinction degree, the corrected oil mist concentration, and the laser calibration.

[0079] To achieve accurate calibration of an oil mist detector based on the extinction method, this invention designs a calibration scheme and related apparatus for an oil mist detector, simulating the oil mist state within a mechanical power unit and performing relevant measurements. The experimental scheme uses the filter paper method to detect oil mist concentration and employs a particulate matter detector to verify the oil mist particle size concentration, correcting the oil mist concentration obtained by the filter paper method. In the visualization module, the extinction degree of oil mist generation is measured using the laser extinction method, yielding the extinction coefficient of oil mist generation. Ultimately, the oil mist detector is calibrated. A calibration test scheme and related apparatus for an oil mist concentration detector, the basic modules of which include:

[0080] (1) Oil mist generation module: The lubricating oil to be tested in the high temperature container is heated by the heating device and kept at a high temperature of about 300°C, so that it continuously generates oil mist that enters the semi-enclosed device. The oil mist concentration is controlled by controlling the amount of air entering the oil mist generation module and the air flow rate.

[0081] (2) Oil mist concentration testing module: An oil mist path is established, and a high-power vacuum pump is used to extract oil mist from the semi-enclosed device. The flow rate of the vacuum pump is controlled by a flow meter, thereby adjusting the volume of oil mist extracted. The oil mist contained in the extracted gas is absorbed by filter paper, and the oil mist concentration is calculated from the mass of the filter paper and the volume of oil mist.

[0082] (3) Extinction test module: A visual test area is set up between the filter paper and the oil mist generation device. A flow equalizer is used at the front and back to make the oil mist extraction as uniform as possible. A laser and a power meter are set on both sides of the visual test area to measure the laser power when the oil mist is not generated and when it is generated. The extinction degree is calculated from the power attenuation after the oil mist is generated.

[0083] (4) Oil mist concentration verification module: Considering the error in the oil mist concentration test by the filter paper method, a certain volume of oil mist is extracted in the visualization test area and passed into the particle concentration and particle size test instrument to measure the oil mist concentration, thereby verifying and correcting the oil mist concentration obtained by the filter paper method.

[0084] Common methods for measuring oil mist concentration include extinction method, filter membrane weighing method, and light scattering method. Among these, the extinction method has advantages such as non-contact measurement, real-time monitoring, fast response speed, simple equipment structure, low maintenance, wide measurement range, and high sensitivity. Compared with the commonly used filter membrane weighing method, the extinction method's advantages of real-time measurement, high response speed, and online monitoring result in higher measurement accuracy, making it more suitable for oil mist detectors. Furthermore, its low maintenance requirements and low cost make extinction-based oil mist detectors more convenient to use. Compared with the commonly used light scattering method, the extinction method is more suitable for enclosed or high-concentration environments and does not require regular cleaning of optical components, making it more suitable for the internal environment of mechanical power devices. Therefore, developing an oil mist concentration detector based on the extinction method is of paramount importance. Before development, the extinction coefficient needs to be calibrated based on the Lambert-Beer theorem. The principle and calibration process are as follows:

[0085] According to Lambert-Beer's law, light attenuates in granular media, and the amount of light intensity attenuation satisfies...

[0086] I= (1)

[0087] In the formula: I and I represent the light intensity before and after attenuation, respectively; The turbidity is caused by the absorption and scattering of light by the particle system; L is the optical path length.

[0088] For particulate media with a uniform single-size particle distribution, the turbidity calculation formula is as follows:

[0089] (2)

[0090] In the formula: denoted as the number concentration of the particulate medium; D is the particle size; m is the particle refractive index. The extinction coefficient of the particle is a function of the incident light wavelength λ, the particle size D, and the particle refractive index m, and can be calculated using Mie theory.

[0091] Clearly, formula (1) describes the quantitative relationship between the concentration and particle size of the particulate medium and the light intensity attenuation. Therefore, based on this mathematical relationship, the concentration and particle size parameters can be measured by determining the light intensity attenuation. In summary, light intensity-concentration conversion can be performed using the extinction method and Lambert-Beer's law.

[0092] The following is the calibration test process and verification plan for the oil mist concentration detector:

[0093] 1. Place the lubricating oil used in the experiment into a high-temperature resistant container, heat it to 300°C using a heating device and continue heating. The oil mist generated by heating is then introduced into the main oil mist generation device and passes through a multi-layer flow equalization plate and a visualization test module. The vacuum pump is turned on to extract the generated oil mist. The flow rate of the vacuum pump is controlled and determined by a flow meter. After the oil mist is extracted, it is absorbed by oil-absorbing paper and filter paper. After a period of extraction, the mass difference between the oil-absorbing paper and filter paper before and after absorbing the oil mist is weighed. Combined with the flow rate and extraction time, the oil mist concentration is calculated.

[0094] 2. Simultaneously with oil mist extraction, record the power change of the laser before and after the oil mist enters. Since a uniform heating method is used during oil mist generation, the generated oil mist is relatively uniform. Furthermore, the oil mist extraction process passes through multiple flow equalizers, so the extracted oil mist dispersion can be considered a stable flowing dispersion. The extinction degree can be obtained by measuring the change in laser power within a certain optical path.

[0095] 3. A verification measurement loop is led out from the side of the visualization testing module. During the measurement process, a sample is extracted from the oil mist dispersion measured by the visualization testing module and directly passed into the particle size concentration detection device for detection. Two sampling ports are set on the side of the visualization testing module. The oil mist particle size and concentration at the two sampling ports are compared under the same operating conditions to verify the uniformity of the measured oil mist nano-dispersion. The measured oil mist concentration is compared with that measured by the filter paper method to analyze and correct the results of the oil mist concentration measured by the filter paper method, making it more accurate.

[0096] The proposed calibration test plan and apparatus for the oil mist concentration detector are attached. Figure 1 The test flowchart for the oil mist concentration detector calibration test is attached. Figure 2 .

[0097] (1). For example Figure 1 The diagram illustrates a schematic scheme for measuring oil mist dispersions, which consists of two main parts: an oil mist dispersion filter paper sampling circuit and a visualization test. The oil mist heating device heats the lubricating oil to 300℃. The generated oil mist mixes with air within the oil mist generator, and once a certain concentration is reached, it enters the visualization measurement module under the suction of an air pump. A flow equalization plate further homogenizes the oil mist-air dispersion within the visualization measurement module. During the measurement process, the oil mist passes through a filter paper clamping circuit. The filter paper clamping device contains three layers of filter paper that adsorb the oil mist in the oil mist-air dispersion. Finally, a flow meter controls the volume of oil mist sampled.

[0098] (2). The visualization test section uses near-infrared light of about 900nm as a laser source and power meter to measure the light power of the measurement area before and after passing through the oil mist. The visualization test module has a sampling port for particulate matter detection device, which can perform particulate matter particle size detection and concentration detection, verify the uniformity in the visualization test module, and correct the concentration measured by the filter paper method.

[0099] (3). For example Figure 2 As shown, a flowchart of the calibration test for an oil mist concentration detector is presented. The oil mist extinction degree and the corrected concentration obtained from the test device can be used to calculate the extinction coefficient, thereby achieving the calibration of the oil mist detector.

[0100] (4) Following the above process, a calibration test scheme and related device for an oil mist concentration detector can be obtained, which can calibrate the oil mist detector while generating a uniform and stable oil mist dispersion system.

[0101] Based on this, the oil mist concentration detector calibration test method provided in this embodiment of the invention has the following beneficial effects:

[0102] (1) Compared to the filter paper sampling method used in the prior art (application number CN202210939081.6), the extinction method adopted in this invention has the advantages of real-time measurement, high response speed, and online monitoring, resulting in higher measurement accuracy. Considering the tendency of the oil mist measured during sampling to adhere to the filter paper during calibration, leading to larger errors and lower accuracy, a verification measurement loop was used to verify and calibrate the oil mist concentration measured by the filter paper method. In summary, the combination of multiple measurement methods and verification in this invention forms an experimental system that fully leverages the advantages of the extinction method while reducing errors present in the filter paper method.

[0103] (2) The prior art in "Application No. CN202111117870.3" uses a filter paper sampling method to calibrate the K coefficient for oil mist concentration detection, thereby using K and a dust detector to detect oil mist concentration, but it cannot be applied to mechanical power devices. The prior art in "Application No. CN202123318996.5" mainly uses two sets of monitoring devices to perform two monitoring sessions, allowing for comparison of the two sets of measurement data, which can eliminate measurement errors caused by external airflow and make the device's measurement readings more accurate. Both "Application No. CN202111117870.3" and "Application No. CN202123318996.5" use optical concentration measurement methods, but they cannot provide data for the development and further calibration of optical oil mist detectors. This invention proposes a test system more suitable for calibrating oil mist detectors in mechanical power devices, starting from a visualization method.

[0104] (3) This invention has broad application prospects and can be used in the development and calibration of internal combustion engine lubricating oil concentration detectors in the fields of automobiles, ships, and aerospace. At the same time, this invention also has certain reference value for test systems in other fields that require calibration using the extinction method.

[0105] Example 2

[0106] In this embodiment, a computer terminal device is provided, including:

[0107] One or more processors;

[0108] A memory, coupled to the processor, for storing one or more programs;

[0109] When the one or more programs are executed by the one or more processors, the one or more processors implement the steps of the above-described oil mist concentration detector calibration test method.

[0110] In this embodiment, a computer-readable storage medium is also provided, on which a computer program is stored. When the computer program is executed by a processor, it implements the steps of the above-described oil mist concentration detector calibration test method.

[0111] In this embodiment, an electronic device is also provided, including a memory and a processor. The memory stores a computer program, and the processor is configured to run the computer program to perform the steps of the above-described oil mist concentration detector calibration test method.

[0112] In this embodiment, a computer program product is also provided, including a computer program that, when executed by a processor, implements the steps of the above-described oil mist concentration detector calibration test method.

[0113] The aforementioned program can run on a processor or be stored in memory (or a computer-readable medium). Computer-readable media includes both permanent and non-permanent, removable and non-removable media, and information storage can be achieved by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random-access memory (SRAM), dynamic random-access memory (DRAM), other types of random-access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0114] These computer programs may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes can be implemented by different modules for different steps.

[0115] This embodiment provides such a device or system. The device, referred to as an oil mist concentration detector calibration test device, includes:

[0116] An oil mist generation module is used to generate oil mist and adjust the oil mist concentration by controlling the air intake and air flow rate.

[0117] The oil mist concentration testing module is used to extract oil mist and absorb it through filter paper to calculate the oil mist concentration.

[0118] The extinction method test module is used to measure the extinction degree of oil mist in a visual test area;

[0119] An oil mist concentration verification module is used to verify and correct the oil mist concentration using a particle concentration and particle size testing instrument.

[0120] The calculation module is used to calculate the extinction coefficient based on the corrected oil mist concentration and extinction to calibrate the oil mist detector.

[0121] As one embodiment of this invention, the oil mist generation module includes:

[0122] A heating unit is used to heat the lubricating oil to generate an oil mist;

[0123] A container unit for holding lubricating oil and guiding oil mist into a semi-enclosed device;

[0124] The air control unit is used to adjust the amount of air entering the system and the airflow rate to control the oil mist concentration.

[0125] As one embodiment of this invention, the oil mist concentration testing module includes:

[0126] The extraction unit is used to extract oil mist using a vacuum pump;

[0127] A flow control unit is used to control the extraction volume via a flow meter;

[0128] A filter paper absorption unit is used to absorb oil mist using filter paper and measure the mass difference before and after absorption.

[0129] The concentration calculation unit is used to calculate the oil mist concentration in conjunction with the extraction volume.

[0130] As one implementation method in this embodiment, the extinction test module includes:

[0131] Test area unit, used to provide a visual test area;

[0132] The flow equalization unit is used to make the oil mist uniform through the flow equalization plate;

[0133] A laser emitting unit is used to emit laser light.

[0134] The power measurement unit is used to measure laser power and calculate extinction.

[0135] As one implementation method in this embodiment, the oil mist concentration verification module includes:

[0136] A sampling unit is used to extract oil mist samples from a visual test area;

[0137] The particle measurement unit is used to measure oil mist concentration using a particle size analyzer.

[0138] The correction unit is used to compare the particle measurement results with the filter paper method results and correct the oil mist concentration.

[0139] As one implementation method in this embodiment, the computing module includes:

[0140] The data input unit is used to receive the corrected oil mist concentration and extinction.

[0141] The coefficient calculation unit is used to calculate the extinction coefficient by applying the light intensity attenuation relationship.

[0142] The system or apparatus is used to implement the functions of the methods in the above embodiments. Each module in the system or apparatus corresponds to each step in the method, as has been described in the method and will not be repeated here.

[0143] The above-described implementation method solves the problem of calibration test for oil mist concentration detectors in related technologies, thereby ensuring that the problems existing in the prior art are resolved.

[0144] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A calibration test method for an oil mist concentration detector, characterized in that, Includes the following steps: Oil mist is generated, and the oil mist concentration is adjusted by controlling the air intake and airflow rate; The oil mist is extracted and absorbed through filter paper to calculate the oil mist concentration. The extinction of the oil mist was measured in the visual test area; The oil mist concentration was verified and corrected using a particle size and concentration testing instrument. The extinction coefficient is calculated based on the corrected oil mist concentration and extinction to calibrate the oil mist detector.

2. The method according to claim 1, characterized in that, The process of generating oil mist and adjusting the oil mist concentration by controlling the air intake and airflow rate includes: The lubricating oil inside the high-temperature resistant container is heated by a heating device to generate oil mist; Introduce oil mist into a semi-enclosed device; The concentration of oil mist is controlled by adjusting the amount of air entering and the airflow rate.

3. The method according to claim 1, characterized in that, The process of extracting oil mist and absorbing it through filter paper to calculate the oil mist concentration includes: Use a vacuum pump to extract oil mist; The extraction volume is controlled by a flow meter; Use filter paper to absorb oil mist and measure the mass difference before and after absorption; The oil mist concentration is calculated based on the extracted volume.

4. The method according to claim 1, characterized in that, The process of measuring the extinction of oil mist in the visualization test area includes: Set up the laser and power meter in the visualization test area; Measure the laser power when oil mist has not yet formed and when it has already formed; Extinction is calculated based on power attenuation.

5. The method according to claim 1, characterized in that, The process of verifying and correcting the oil mist concentration using a particle size analyzer includes: Extract oil mist samples from the visualized test area; The sample is passed through a particle size analyzer to measure the oil mist concentration. Compare the particle concentration and particle size measurement results with the filter paper method; Correct the oil mist concentration obtained by the filter paper method.

6. The method according to claim 1, characterized in that, The process of calculating the extinction coefficient based on the corrected oil mist concentration and extinction degree includes: Applying Lambert-Beer's law, the extinction coefficient was determined based on the extinction degree, the corrected oil mist concentration, and the laser calibration.

7. A calibration test device for an oil mist concentration detector, characterized in that, The apparatus for implementing the method according to any one of claims 1-6 comprises: An oil mist generation module is used to generate oil mist and adjust the oil mist concentration by controlling the air intake and air flow rate. The oil mist concentration testing module is used to extract oil mist and absorb it through filter paper to calculate the oil mist concentration. The extinction method test module is used to measure the extinction degree of oil mist in a visual test area; An oil mist concentration verification module is used to verify and correct the oil mist concentration using a particle concentration and particle size testing instrument. The calculation module is used to calculate the extinction coefficient based on the corrected oil mist concentration and extinction to calibrate the oil mist detector.

8. A computer terminal device, characterized in that, include: One or more processors; A memory, coupled to the processor, for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors perform the steps of the method as described in any one of claims 1-6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1-6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1-6.

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