Wide-temperature variable all-metal filter core 25 mu m section particle interception efficiency precision detection system and method

Abstract

The application discloses a wide-temperature-variable full-metal filter element 25-micron-section particle interception efficiency precision detection system and method, and belongs to the technical field of aviation and ship oil filtration. The system comprises a dust screening module, an oil liquid mixing module, an oil temperature regulation module, a filter element to-be-detected device, a synchronous sampling module, a cooperative control module and an oil return conveying module; the dust screening module is used for screening 25-micron-section particles; the oil liquid mixing module, the oil temperature regulation module, the filter element to-be-detected device and the oil return conveying module form a circulating flow path and are used for oil liquid mixing and self-purification; the oil temperature regulation module is used for regulating the oil temperature to-45 DEG C to 150 DEG C; the synchronous sampling module is used for collecting the oil liquid particle concentrations at the inlet and outlet of the filter element; and the cooperative control module is internally provided with a multi-parameter control model and is used for temperature regulation, constant flow and particle concentration. The application can precisely check the index of "wide-temperature-variable filter element 25-micron-section particle interception efficiency >=100%" of the aviation and ship, and provides precise technical support for aviation and ship filtration performance calibration.

Description

Technical Field

[0001] This application belongs to the field of aviation and marine oil filtration technology, and more specifically, relates to a system and method for accurately detecting the particle interception efficiency of a wide-temperature-varying all-metal filter element in the 25μm segment. Background Technology

[0002] Some high-end oil filtration equipment in aviation and marine applications operates under extreme conditions involving coupled temperature variations across a wide temperature range of -45℃ to 150℃, with frequent alternations between hot and cold. The viscosity, fluidity, and solid particle transport characteristics of the oil medium change significantly with temperature. Solid particles in the 23μm–27μm diameter range (referred to as 25μm particles) fall within the critically sensitive particle size range. Particles in this range can exacerbate wear on precision-fitted components, clog fuel injectors, cause malfunctions in the power system, and even lead to safety accidents. Therefore, relevant technical requirements in aviation and marine applications clearly stipulate that the matching metal filter element must achieve a 100% interception efficiency for 25μm particles at rated flow rate and rated contaminant concentration within a temperature range of -45℃ to 150℃.

[0003] When the oil temperature varies between -45℃ and 150℃, the oil viscosity changes significantly, directly leading to substantial increases or decreases in oil flow rate. Changes in flow rate directly cause drift in the particulate contaminant concentration at the filter element inlet, resulting in large errors in the test results under these conditions. Therefore, verifying the filter element's requirement of achieving 100% particle interception efficiency in the 25μm segment under rated flow rate and rated contaminant concentration at -45℃ to 150℃ requires a special control scheme. This scheme locks the rated flow rate and maintains a constant contaminant concentration at the filter element inlet, accurately detecting the 25μm particle interception efficiency under a single, wide temperature variation condition. However, the existing detection technologies have many shortcomings and cannot be directly applied. Specifically, they are reflected in the following aspects: (1) Most existing detection systems are based on normal temperature conditions and lack the control technology of "locking the flow rate and maintaining a constant pollutant concentration at the filter inlet under temperature change conditions". They do not have the ability to simulate wide temperature change and high and low temperature alternation coupling in the entire range of -45℃ to 150℃, and cannot achieve the determination of the interception efficiency of 25μm particles at rated flow rate and rated pollutant concentration in the range of -45℃ to 150℃ (excluding normal temperature); (2) Existing detection technologies generally use mixed dust with multiple particle sizes, which cannot achieve accurate independent screening, quantitative supply and targeted detection of particles with a single characteristic particle size of 25μm. Large and small particles in mixed dust will interfere with each other and be coupled together. It is impossible to quantify the true interception capability of the filter for 25μm deadly sensitive particles, and it is impossible to verify the 100% interception index of 25μm particles required by high-end equipment for aviation and ships. The detection targeting is extremely poor and the error is large.

[0004] In summary, there is currently no suitable detection system or method in the industry to verify the requirement that "the interception efficiency of the 25μm segment of the matching metal filter element must reach 100% under the rated flow and rated pollutant concentration at a temperature of -45℃ to 150℃". Therefore, this invention proposes a wide-temperature-variable all-metal filter element 25μm segment particle interception efficiency accurate detection system and method to solve the above problems. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing a precise detection system and method for the 25μm particle interception efficiency of wide-temperature-variable all-metal filter elements. It aims to solve the problem that existing technologies cannot verify the requirement in aviation and marine applications that "the interception efficiency of the 25μm particle segment of the matching metal filter element must reach 100% under rated flow and rated pollutant concentration conditions at -45℃ to 150℃." One of the above-mentioned objectives of the present invention is achieved by the following technical solution: A wide-temperature-variable all-metal filter element 25μm particle interception efficiency precision detection system includes: a dust sieving module, an oil mixing module, an oil temperature control module, a filter element test device, a synchronous sampling module, a collaborative control module, and a return oil conveying module. The dust sieving module is used for online sieving of A3 grade Arizona standard test dust specified in ISO12103-1, separating particles with a diameter of 25μm. The oil mixing module, together with the oil temperature control module, the filter element test device, and the return oil conveying module, forms a circulating flow path for mixing pure oil with 25μm particles and for self-purification. The oil temperature control module is used to control the oil temperature of the test system from -45℃ to 150℃. The synchronous sampling module is used to collect the particle concentration of the oil at the filter element inlet and outlet. The collaborative control module is electrically connected to the dust sieving module, the oil mixing module, the oil temperature control module, and the synchronous sampling module, and incorporates a multi-parameter coupled control mathematical model for stabilizing test constraints.

[0006] Furthermore, the dust screening module includes a first oil tank, a first delivery pump, a particle screening device, and a second oil tank connected in series. The first oil tank is used to uniformly mix A3 grade Arizona standard test dust specified in ISO12103-1 and YH-15 aviation hydraulic oil, and to continuously supply oil to the particle screening device. After mixing, the particle contamination concentration of the oil in the first oil tank is 10 mg / L. The first delivery pump is used to pump the mixed oil in the first oil tank into the particle screening device. The particle screening device adopts a tank-like structure, and its tank body is equipped with a 27μm screening screen and a 23μm screening screen from top to bottom, for online screening of particles ≥27μm, 25μm particles, and ≤23μm particles. The 25μm particle mixture flows into the oil mixing module from the first outlet of the device, and the ≥27μm particle mixture and the ≤23μm particle mixture flow into the second oil tank from the second outlet and the third outlet of the device, respectively. The second oil tank is used to collect waste oil.

[0007] Furthermore, the oil mixing module includes a pure oil purification unit connected in series and a fourth oil tank; the pure oil purification unit includes a third oil tank, a second delivery pump, a first flow sensor, a first differential pressure sensor, a 10μm high-pressure filter, a second differential pressure sensor, a 3μm high-pressure filter, and a cooler, all connected in series to form a closed loop; the third oil tank is used to store and supply pure oil for testing, and the oil in the tank has a particulate contaminant level ≥7; the second delivery pump is used to pump the oil in the third oil tank into the fourth oil tank; the first flow sensor is used to detect the output flow rate after the second delivery pump. The data is then uploaded to the collaborative control module. The first differential pressure sensor and the second differential pressure sensor are used to detect the differential pressure across the 10μm high-pressure filter and the 3μm high-pressure filter, respectively, and upload the two differential pressure values ​​to the collaborative control module. The collaborative control module monitors the operating status of the high-pressure filter and determines whether the filter element needs to be replaced. The 10μm high-pressure filter and the 3μm high-pressure filter are used to purify the oil. The cooler is used to cool the return oil. The fourth oil tank is connected to the pure oil purification unit and the dust screening module, respectively, and is used to mix 25μm segment particulate liquid and pure oil online.

[0008] Furthermore, a fourth flow sensor and a third pressure sensor are connected in series on the conveying branch between the particle screening device and the fourth oil tank.

[0009] Furthermore, the oil temperature control module includes a third delivery pump, a first temperature sensor, an oil temperature control device, a third differential pressure sensor, a second flow sensor, a flow regulating valve, and a second temperature sensor (T2) connected in series. The third delivery pump is used to inject oil from the fourth oil tank into the oil temperature control device. The first and second temperature sensors are used to detect the oil temperature at the inlet of the oil temperature control device and the inlet of the filter element test device, respectively, and upload the data to the collaborative control module. The oil temperature control device integrates cooling and heating functions and is used to control the oil temperature to -45℃ to 150℃ and upload the relevant parameters to the collaborative control module. The third differential pressure sensor is used to detect the pressure difference across the flow regulating valve and upload the data to the collaborative control module. The second and third flow sensors are used to detect the inlet and outlet flow rates of the flow regulating valve, respectively, and upload the data to the collaborative control module. The flow regulating valve is used to regulate the oil flow and upload the current valve opening to the collaborative control module.

[0010] Furthermore, the synchronous sampling module includes an inlet sampling unit and an outlet sampling unit for the filter element test device. The inlet sampling unit includes a first needle valve, a first pressure sensor, a first online particle counter, and a first shut-off valve connected in series. The first pressure sensor detects the inlet pressure of the first online particle counter and uploads the data to the collaborative control module. The first online particle counter detects the concentration of particulate contaminants in the 25μm segment at the inlet of the filter element test device and uploads the data to the collaborative control module. The outlet sampling unit includes a second needle valve, a second pressure sensor, a second online particle counter, and a second shut-off valve connected in series. The second pressure sensor detects the inlet pressure of the second online particle counter and uploads the data to the collaborative control module. The second online particle counter detects the concentration of particulate contaminants in the 25μm segment at the outlet of the filter element test device and uploads the data to the collaborative control module.

[0011] The second objective of this invention is achieved through the following technical solution. A method for accurately detecting the particle interception efficiency of a wide-temperature-variable all-metal filter element in the 25μm segment includes the following steps: S1. Turn on the oil mixing module and the pure oil purification unit purifies the test oil to the third oil tank. The particulate pollutant level is ≥7. S2. Turn off the pure oil purification unit, turn on the first oil tank inlet system, inject the pure oil from the third oil tank into the first oil tank to the fixed level I0, and turn off the first oil tank inlet system. S3. Inject a fixed amount of A3 standard dust into the first oil tank, start the mixing program of the first oil tank, and complete the mixing of the oil in the first oil tank. After mixing, the oil concentration is 10mg / L. S4. Start and run each functional module; S5. The system uses multiple sets of mathematical function models to coordinate and regulate the flow rate and dust concentration. During the stepped temperature change stage, two parameters are kept constant, and the system operates at a constant temperature after each temperature level meets the standard. During the operation of the system, the collaborative control module collects feedback data from the synchronous sampling module, calculates the interception efficiency of 25μm particles at different temperatures in real time based on the built-in function, and saves the data. Furthermore, in step 5, the process by which the system coordinates the flow rate and dust concentration through multiple sets of mathematical function models includes: S51, stable operation at normal temperature for 30 minutes; S52. Gradual cooling to -45℃, gradient interval ΔT=20℃, cooling rate ≤2℃ / min; S53. The collaborative control module inputs the target filter element inlet oil parameters, including: temperature Tset, flow rate Qset, and 25μm particle concentration Cset; S54. Establish the first mathematical function model, calculate the heating or cooling power adjustment amount u1 at time t in real time based on the feedback parameters, and transmit it to the oil temperature control module; simultaneously establish the second and third mathematical function models, calculate the valve opening adjustment amount u2 at time t in real time based on the feedback parameters, and transmit it to the flow control valve; simultaneously establish the fourth mathematical function model, calculate the input flow rate Q2 of the particle screening device to the fourth oil tank at time t in real time based on the feedback parameters, and transmit it to the dust screening module. S55, the oil temperature control module adjusts the heating or cooling power according to instruction u1 to complete the heating or cooling to T. set The synchronous flow regulating valve adjusts the valve opening according to command u2, maintaining a constant filter element inlet Q. set The synchronous dust screening module adjusts the flow rate according to instruction Q2, maintaining a constant filter inlet flow rate. Cset S56, in T set =T 实测 Q set =Q 实测 C set =C 实测 Under operating conditions, it can maintain a constant temperature and operate stably for 30 minutes. S57, when T set =-45℃ and T 实测 Stop cooling when the temperature reaches -45℃; otherwise, return to action S53 and continue the cycle to S57. S58. Gradual heating to 150℃, gradient interval ΔT=20℃, heating rate ≤3℃ / min; heating process is the same as S53, S54, S55, S56. S59, when T set =150℃ and T 实测 Stop heating when the temperature reaches 150℃; otherwise, return to action S58 and continue the heating cycle until S57. S510, Gradual cooling to 20℃, gradient interval ΔT=20℃, cooling rate ≤2℃ / min, cooling process is the same as S53, S54, S55, S56; S511, when T set =20℃ and T 实测 Stop heating when the temperature reaches 20℃; otherwise, return to action S510 and continue the cycle of cooling down to S511. Furthermore, the expression for the first mathematical function model is: in, For power regulation control, 0 ≤ ≤1; This refers to the total mass of the oil in the system. The specific heat capacity of oil at constant pressure. The system temperature change rate, The rated power of the heating or cooling equipment. Let t be the oil flow rate; For traffic index; The temperature drop coefficient is 1; The temperature drop coefficient is 2; T is the temperature at time t; T 环境 Ambient temperature; The second mathematical function model expression: in, For the flow valve opening control quantity, 0≤ ≤1; The compensation coefficient is used for system calibration. The valve's basic opening under rated operating conditions, 0≤ ≤1; The expression for the third mathematical function model is: in, The oil flow rate at the inlet of the filter element at temperature T; The flow coefficient of the flow regulating valve; The dynamic viscosity at temperature T; The pressure difference across the flow control valve; The expression for the fourth mathematical function model is: in, The outlet flow rate for the 25μm particle size segment of the dust screening module; This refers to the filter element inlet flow rate. The concentration of contaminants at the filter element inlet; The concentration of pollutants at the inlet of the dust screening device; The interception efficiency is 27μm sieve; The interception efficiency is 23μm sieve.

[0012] The advantages and positive effects of this invention are as follows: (1) This invention achieves constant filter inlet flow and particle concentration in the 25μm segment throughout the temperature change from -45℃ to 150℃ by coupling and coordinating multiple mathematical models. Temperature is the only variable, resulting in less experimental interference and strong data repeatability and comparability.

[0013] (2) The present invention separates particles in the narrow range of 23-27μm through two-stage screening tanks, and separately calibrates the interception efficiency of particles in the 25μm segment of the filter element, eliminating the detection error caused by mixed particle size dust, and achieving high detection accuracy.

[0014] (3) This invention can accurately verify the "hard index of 100% interception of 25μm particles by filter element under rated flow and rated pressure" specified in aviation and marine hydraulic equipment, and meet the requirements of filter element design and factory acceptance inspection.

[0015] (4) The detection system of the present invention is equipped with a pre-mixing buffer tank and a concentration closed-loop correction to avoid particle sedimentation and enrichment in the entire temperature range, and the pollutant concentration does not shift during long-term testing.

[0016] (5) The present invention integrates dust classification, temperature control, constant flow concentration control and online detection modules. The parameters are adjustable to adapt to various all-metal filter elements, which is highly versatile and reduces the investment in detection equipment.

[0017] (6) The test benchmark conditions of this invention are unified and standardized, and the test data can be used as an effective evaluation basis for filter element classification, domestic substitution, and the entry of ship and air equipment into service. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the wide-temperature-variable all-metal filter element 25μm segment particle interception efficiency accurate detection system provided in the embodiments of this application; Figure 2 This is a schematic diagram of the precise detection system for the 25μm segment particle interception efficiency of a wide-temperature-varying all-metal filter element provided in this application embodiment; Figure 3 This is a schematic diagram of the process for accurately detecting the particle interception efficiency of a 25μm segment of a ship-width temperature-varying all-metal filter element provided in this application embodiment. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] The terms "first" and "second," etc., used in the specification and claims of this invention are used to distinguish different objects, not to describe a specific order of objects. For example, "first response message" and "second response message," etc., are used to distinguish different response messages, not to describe a specific order of response messages.

[0021] This invention provides a system for accurately detecting the particle interception efficiency of a wide-temperature-variable all-metal filter element in the 25μm segment, such as... Figure 1 , Figure 2 As shown, the system includes: a dust sieving module, an oil mixing module, an oil temperature control module, a filter element testing device, a synchronous sampling module, a collaborative control module, and a return oil conveying module. Specifically: the dust sieving module is used for online sieving of A3 grade Arizona standard test dust as specified in ISO 12103-1, separating particles with a diameter of 25μm. The oil mixing module, together with the oil temperature control module, the filter element testing device, and the return oil conveying module, forms a circulating flow path for mixing pure oil with 25μm particles and for self-purification. The oil temperature control module is used to regulate the oil temperature of the test system to -45℃ to 150℃. The synchronous sampling module is used to collect the particle concentration of the oil at the filter element inlet and outlet. The collaborative control module is electrically connected to the dust sieving module, the oil mixing module, the oil temperature control module, and the synchronous sampling module, and has a built-in multi-parameter coupled control mathematical model for stabilizing test constraints. This invention can accurately verify the indicator of "25μm segment particle interception efficiency ≥100% for wide temperature-varying filter elements" on ships, providing precise technical support for the calibration of wide temperature-varying filtration performance on ships.

[0022] The dust sieving module is independent of the main test system and performs 25μm particle sieving at room temperature. It includes a first oil tank, a first delivery pump, a particle sieving device, and a second oil tank connected in series. The first oil tank is used to uniformly mix A3 grade Arizona standard test dust (as specified in ISO 12103-1) and YH-15 aviation hydraulic oil, and to continuously supply oil to the particle sieving device. Before mixing, the particulate contaminant level of the oil in the first oil tank is ≥7 (NAS51138), and after mixing, the particulate contaminant concentration in the oil in the first oil tank is 10mg / L. The first delivery pump is used to pump the mixed oil from the first oil tank into the particle sieving device. The particle screening device adopts a tank-like structure. From top to bottom, the tank is equipped with a 27μm screening screen and a 23μm screening screen for online screening of particles ≥27μm, 25μm particles, and ≤23μm particles. The mixture of 25μm particles flows into the oil mixing module through the first outlet, while the mixtures of ≥27μm and ≤23μm particles flow into the second oil tank through the second and third outlets, respectively. The second oil tank is used to collect waste oil.

[0023] The oil mixing module includes a series-connected pure oil purification unit and a fourth oil tank. The pure oil purification unit includes a third oil tank (connected in series to form a closed loop), a second delivery pump, a first flow sensor (FS1), a first differential pressure sensor (ΔP1), a 10μm high-pressure filter, a second differential pressure sensor (ΔP2), a 3μm high-pressure filter, and a cooler. The third oil tank stores and supplies pure oil for testing; the oil in the tank has a particulate contaminant level ≥7 (NAS51138). The second delivery pump pumps the oil from the third oil tank into the fourth oil tank. The first flow sensor detects the output flow rate after the second delivery pump and uploads it to the collaborative control module. The first and second differential pressure sensors detect the differential pressure across the 10μm and 3μm high-pressure filters, respectively, and upload these values ​​to the collaborative control module. The collaborative control module monitors the operating status of the high-pressure filters and determines whether filter element replacement is necessary. Specifically, when the differential pressure exceeds a set threshold, filter element replacement is required, and an alarm or other reminder may be issued. The 10μm high-pressure filter and 3μm high-pressure filter are used to purify the oil. The cooler is used to cool the return oil. The fourth oil tank is connected to the pure oil purification unit and the dust screening module respectively, and is used for online mixing of 25μm particulate liquid and pure oil.

[0024] The oil temperature control module includes a third delivery pump, a first temperature sensor (T1), an oil temperature control device, a third differential pressure sensor (ΔP3), a second flow sensor (FS2), a flow regulating valve, and another third flow sensor (FS3) connected in series. The third delivery pump is used to inject oil from the fourth oil tank into the oil temperature control device. The first and second temperature sensors are used to detect the oil temperature at the inlet of the oil temperature control device and the inlet of the filter element under test device, respectively, and upload the data to the collaborative control module. The oil temperature control device integrates cooling and heating functions, and is used to control the oil temperature from -45℃ to 150℃ and upload relevant parameters to the collaborative control module. Immersion electric heating is used to control the oil temperature. Refrigerant cascade refrigeration is used to achieve low-temperature cooling. The third differential pressure sensor is used to detect the pressure difference across the flow regulating valve and upload the data to the collaborative control module. The second and third flow sensors are used to detect the inlet and outlet flow rates of the flow regulating valve, respectively, and upload the data to the collaborative control module. The flow regulating valve is used to regulate the oil flow and upload the current valve opening to the collaborative control module.

[0025] The synchronous sampling module includes an inlet sampling unit and an outlet sampling unit for the filter element test device. The inlet sampling unit comprises a first needle valve, a first pressure sensor (P1), a first online particle counter (C1), and a first shut-off valve (GV1) connected in series. The first pressure sensor detects the inlet pressure of the first online particle counter and uploads the data to the collaborative control module; the first online particle counter detects the particulate contaminant concentration in the 25μm segment at the inlet of the filter element test device and uploads the data to the collaborative control module. The outlet sampling unit comprises a second needle valve, a second pressure sensor (P2), a second online particle counter (C2), and a second shut-off valve (GV2) connected in series. The second pressure sensor detects the inlet pressure of the second online particle counter and uploads the data to the collaborative control module; the second online particle counter detects the particulate contaminant concentration in the 25μm segment at the outlet of the filter element test device and uploads the data to the collaborative control module.

[0026] The collaborative control module is electrically connected to the dust sieving module, the oil mixing module, the oil temperature control module, and the synchronous sampling module. It has a built-in multi-parameter coupled control mathematical model for stabilizing experimental constraints. The oil return and delivery module includes a 30µm high-pressure filter and a fourth delivery pump connected in series, and the filter element is returned to the third oil tank via the cooler.

[0027] In addition, a fourth flow sensor (FS4) and a third pressure sensor (P3) are connected in series on the conveying branch between the particle screening device and the fourth oil tank.

[0028] Based on the aforementioned detection system, this application provides a method for accurately detecting the particle interception efficiency of a wide-temperature-varying all-metal filter element in the 25μm segment. Figure 3 As shown, this method employs multi-mathematical model coupling and collaborative control, and gradient online sieving of 25μm particles, including the following steps: S1. Turn on the oil mixing module and the pure oil purification unit purifies the test oil to the third oil tank. The particulate pollutant level is ≥7. S2. Turn off the pure oil purification unit, turn on the first oil tank inlet system, inject the pure oil from the third oil tank into the first oil tank to the fixed level I0, and turn off the first oil tank inlet system. S3. Inject a fixed amount of A3 standard dust into the first oil tank, start the mixing program of the first oil tank, and complete the mixing of the oil in the first oil tank. After mixing, the oil concentration is 10mg / L. S4. Start and run each functional module; S5. The system uses multiple sets of mathematical function models to coordinate and regulate the flow rate and dust concentration. During the stepped temperature change stage, two parameters are kept constant, and the system operates at a constant temperature after each temperature level meets the standard. During the operation of the system, the collaborative control module collects feedback data from the synchronous sampling module, calculates the 25μm particle interception efficiency at different temperatures in real time based on the built-in function, and saves the data.

[0029] In step 5 above, the process by which the system coordinates the flow rate and dust concentration through multiple sets of mathematical function models includes: S51, stable operation at normal temperature for 30 minutes; S52. Gradual cooling to -45℃, gradient interval ΔT=20℃, cooling rate ≤2℃ / min; S53. The collaborative control module inputs the target filter element inlet oil parameters, including (additional content, please confirm the description is accurate): Temperature T set Traffic Q set 25μm particle concentration C set ; S54. Establish the first mathematical function model, calculate the heating or cooling power adjustment amount u1 at time t in real time based on the feedback parameters, and transmit it to the oil temperature control module; simultaneously establish the second and third mathematical function models, calculate the valve opening adjustment amount u2 at time t in real time based on the feedback parameters, and transmit it to the flow control valve; simultaneously establish the fourth mathematical function model, calculate the input flow rate Q2 of the particle screening device to the fourth oil tank at time t in real time based on the feedback parameters, and transmit it to the dust screening module. S55, the oil temperature control module adjusts the heating or cooling power according to instruction u1 to complete the heating or cooling to T. set The synchronous flow regulating valve adjusts the valve opening according to command u2, maintaining a constant filter element inlet Q. set The synchronous dust screening module adjusts the flow rate according to instruction Q2, maintaining a constant filter inlet C. set .

[0030] S56, in T set =T 实测 Q set =Q 实测 C set =C 实测 Under operating conditions, it can maintain a constant temperature and operate stably for 30 minutes. S57, when T set =-45℃ and T 实测 Stop cooling when the temperature reaches -45℃; otherwise, return to action S53 and continue the cycle to S57. S58. Gradual heating to 150℃, gradient interval ΔT=20℃, heating rate ≤3℃ / min; heating process is the same as S53, S54, S55, S56. S59, when Tset =150℃ and T 实测 Stop heating when the temperature reaches 150℃; otherwise, return to action S58 and continue the heating cycle until S57. S510, Gradual cooling to 20℃, gradient interval ΔT=20℃, cooling rate ≤2℃ / min, cooling process is the same as S53, S54, S55, S56; S511, when T set =20℃ and T 实测 Stop heating when the temperature reaches 20℃; otherwise, return to action S510 and continue the cooling cycle until S511.

[0031] The first mathematical function model expression: in, For power regulation control, 0 ≤ ≤1; This refers to the total mass of the oil in the system. The specific heat capacity of oil at constant pressure. The system temperature change rate, The rated power of the heating or cooling equipment. Let t be the oil flow rate; For traffic index; The temperature drop coefficient is 1; The temperature drop coefficient is 2; T is the temperature at time t; T 环境 The ambient temperature.

[0032] The second mathematical function model expression: in, For the flow valve opening control quantity, 0≤ ≤1; The compensation coefficient is used for system calibration. The valve's basic opening under rated operating conditions, 0≤ ≤1.

[0033] The expression for the third mathematical function model is: in, The oil flow rate at the inlet of the filter element at temperature T; The flow coefficient of the flow regulating valve; The dynamic viscosity at temperature T; This refers to the pressure difference across the flow control valve.

[0034] The expression for the fourth mathematical function model is: in, The outlet flow rate for the 25μm particle size segment of the dust screening module; This refers to the filter element inlet flow rate. The concentration of contaminants at the filter element inlet; The concentration of pollutants at the inlet of the dust screening device; The interception efficiency is 27μm sieve; The interception efficiency is 23μm sieve.

[0035] The above description is merely a specific embodiment of this application, but the scope of protection of this application 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 this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A system for accurately detecting the particle interception efficiency of a wide-temperature-variable all-metal filter element in the 25μm segment, characterized in that: The system includes a dust sieving module, an oil mixing module, an oil temperature control module, a filter element testing device, a synchronous sampling module, a collaborative control module, and a return oil conveying module. The dust sieving module is used for online sieving of A3-level Arizona standard test dust as specified in ISO 12103-1, separating particles with a diameter of 25μm. The oil mixing module, oil temperature control module, filter element testing device, and return oil conveying module form a circulating flow path for mixing pure oil with 25μm particles and for self-purification. The oil temperature control module is used to control the oil temperature of the test system from -45℃ to 150℃. The synchronous sampling module is used to collect the concentration of oil particles at the filter element inlet and outlet. The collaborative control module is electrically connected to the dust sieving module, oil mixing module, oil temperature control module, and synchronous sampling module, and has a built-in multi-parameter coupled control mathematical model for stabilizing test constraints.

2. The wide-temperature-variable all-metal filter element 25μm segment particle interception efficiency accurate detection system according to claim 1, characterized in that: The dust screening module includes a first oil tank, a first delivery pump, a particle screening device, and a second oil tank connected in series. The first oil tank is used to uniformly mix A3 grade Arizona standard test dust as specified in ISO12103-1 and YH-15 aviation hydraulic oil. After mixing, the particle contamination concentration of the oil in the first oil tank is 10 mg / L, and it continuously supplies oil to the particle screening device. The first delivery pump is used to pump the mixed oil in the first oil tank into the particle screening device. The particle screening device adopts a tank-like structure, and its tank body is equipped with a 27 μm screening screen and a 23 μm screening screen from top to bottom. It is used for online screening of particles ≥27 μm, particles in the 25 μm range, and particles ≤23 μm. The 25 μm particle mixture flows into the oil mixing module from the first outlet of the device, and the ≥27 μm particle mixture and the ≤23 μm particle mixture flow into the second oil tank from the second outlet and the third outlet of the device, respectively. The second oil tank is used to collect waste oil.

3. The wide-temperature-variable all-metal filter element 25μm segment particle interception efficiency accurate detection system according to claim 2, characterized in that: The oil mixing module includes a series-connected pure oil purification unit and a fourth oil tank; the pure oil purification unit includes a third oil tank, a second delivery pump, a first flow sensor, a first differential pressure sensor, a 10μm high-pressure filter, a second differential pressure sensor, a 3μm high-pressure filter, and a cooler, all connected in series to form a closed loop; the third oil tank is used to store and supply pure oil for testing, and the oil in the tank has a particulate contaminant level ≥7; the second delivery pump is used to pump the oil from the third oil tank into the fourth oil tank; the first flow sensor is used to detect the output flow rate after the second delivery pump and... The data is uploaded to the collaborative control module; the first differential pressure sensor and the second differential pressure sensor are used to detect the differential pressure across the 10μm high-pressure filter and the 3μm high-pressure filter respectively, and upload the two differential pressure values ​​to the collaborative control module. The collaborative control module monitors the operating status of the high-pressure filter and determines whether the filter element needs to be replaced; the 10μm high-pressure filter and the 3μm high-pressure filter are used to purify the oil; the cooler is used to cool the return oil; the fourth oil tank is connected to the pure oil purification unit and the dust screening module, and is used to mix 25μm segment particulate liquid and pure oil online.

4. The precise detection system for the 25μm segment particle interception efficiency of a wide-temperature-varying all-metal filter element according to claim 3, characterized in that: A fourth flow sensor and a third pressure sensor are connected in series on the conveying branch between the particle screening device and the fourth oil tank.

5. The wide-temperature-variable all-metal filter element 25μm segment particle interception efficiency accurate detection system according to claim 2, characterized in that: The oil temperature control module includes a third delivery pump, a first temperature sensor, an oil temperature control device, a third differential pressure sensor, a second flow sensor, a flow regulating valve, and a third flow sensor connected in series. The third delivery pump is used to inject oil from the fourth oil tank into the oil temperature control device. The first and second temperature sensors are used to detect the oil temperature at the inlet of the oil temperature control device and the inlet of the filter element test device, respectively, and upload the data to the collaborative control module. The oil temperature control device integrates cooling and heating functions and is used to control the oil temperature to -45℃ to 150℃ and upload the relevant parameters to the collaborative control module. The third differential pressure sensor is used to detect the pressure difference across the flow regulating valve and upload the data to the collaborative control module. The second and third flow sensors are used to detect the inlet and outlet flow rates of the flow regulating valve, respectively, and upload the data to the collaborative control module. The flow regulating valve is used to regulate the oil flow and upload the current valve opening to the collaborative control module.

6. The precise detection system for the 25μm segment particle interception efficiency of a wide-temperature-varying all-metal filter element according to claim 1, characterized in that: The synchronous sampling module includes an inlet sampling unit and an outlet sampling unit for the filter element test device. The inlet sampling unit comprises a first needle valve, a first pressure sensor, a first online particle counter, and a first shut-off valve connected in series. The first pressure sensor detects the inlet pressure of the first online particle counter and uploads the data to the collaborative control module. The first online particle counter detects the particulate contaminant concentration in the 25μm segment at the inlet of the filter element test device and uploads the data to the collaborative control module. The outlet sampling unit comprises a second needle valve, a second pressure sensor, a second online particle counter, and a second shut-off valve connected in series. The second pressure sensor detects the inlet pressure of the second online particle counter and uploads the data to the collaborative control module. The second online particle counter detects the particulate contaminant concentration in the 25μm segment at the outlet of the filter element test device and uploads the data to the collaborative control module.

7. A method for accurately detecting the particle interception efficiency of a wide-temperature-variable all-metal filter element in the 25μm segment, characterized in that: The precise detection system for the 25μm segment particle interception efficiency of the wide-temperature-varying all-metal filter element as described in claim 5 includes the following steps: S1. Turn on the oil mixing module and the pure oil purification unit purifies the test oil to the third oil tank. The particulate pollutant level is ≥7. S2. Turn off the pure oil purification unit, turn on the first oil tank inlet system, inject the pure oil from the third oil tank into the first oil tank to the fixed level I0, and turn off the first oil tank inlet system. S3. Inject a fixed amount of A3 standard dust into the first oil tank, start the mixing program of the first oil tank, and complete the mixing of the oil in the first oil tank. After mixing, the oil concentration is 10mg / L. S4. Start and run each functional module; S5. The system uses multiple sets of mathematical function models to coordinate and regulate the flow rate and dust concentration. During the stepped temperature change stage, two parameters are kept constant, and the system operates at a constant temperature after each temperature level meets the standard. During the operation of the system, the collaborative control module collects feedback data from the synchronous sampling module, calculates the 25μm particle interception efficiency at different temperatures in real time based on the built-in function, and saves the data.

8. The method for accurately detecting the particle interception efficiency of a wide-temperature-varying all-metal filter element in the 25μm segment according to claim 7, characterized in that: In step 5, the process by which the system coordinates the flow rate and dust concentration through multiple sets of mathematical function models includes: S51, stable operation at normal temperature for 30 minutes; S52. Gradual cooling to -45℃, gradient interval ΔT=20℃, cooling rate ≤2℃ / min; S53. The collaborative control module inputs the target filter element inlet oil parameters, including: temperature Tset, flow rate Qset, and 25μm particle concentration Cset; S54. Establish the first mathematical function model, calculate the heating or cooling power adjustment amount u1 at time t in real time based on the feedback parameters, and transmit it to the oil temperature control module; simultaneously establish the second and third mathematical function models, calculate the valve opening adjustment amount u2 at time t in real time based on the feedback parameters, and transmit it to the flow control valve; simultaneously establish the fourth mathematical function model, calculate the input flow rate Q2 of the particle screening device to the fourth oil tank at time t in real time based on the feedback parameters, and transmit it to the dust screening module. S55, the oil temperature control module adjusts the heating or cooling power according to instruction u1 to complete the heating or cooling to T. set The synchronous flow regulating valve adjusts the valve opening according to command u2, maintaining a constant filter element inlet Q. set The synchronous dust screening module adjusts the flow rate according to instruction Q2, maintaining a constant filter inlet C. set ; S56, in T set =T 实测 Q set =Q 实测 C set =C 实测 Under operating conditions, it can maintain a constant temperature and operate stably for 30 minutes. S57, when T set =-45℃ and T 实测 Stop cooling when the temperature reaches -45℃; otherwise, return to action S53 and continue the cycle to S57. S58. Gradual heating to 150℃, gradient interval ΔT=20℃, heating rate ≤3℃ / min; heating process is the same as S53, S54, S55, S56. S59, when T set =150℃ and T 实测 Stop heating when the temperature reaches 150℃; otherwise, return to action S58 and continue the heating cycle until S57. S510, Gradual cooling to 20℃, gradient interval ΔT=20℃, cooling rate ≤2℃ / min, cooling process is the same as S53, S54, S55, S56; S511, when T set =20℃ and T 实测 Stop heating when the temperature reaches 20℃; otherwise, return to action S510 and continue the cooling cycle until S511.

9. The method for accurately detecting the particle interception efficiency of a wide-temperature-varying all-metal filter element in the 25μm segment according to claim 8, characterized in that: The first mathematical function model expression: in, For power regulation control, 0 ≤ ≤1; This refers to the total mass of the oil in the system. The specific heat capacity of oil at constant pressure. The system temperature change rate, The rated power of the heating or cooling equipment. Let t be the oil flow rate; For traffic index; The temperature drop coefficient is 1; The temperature drop coefficient is 2; T is the temperature at time t; T 环境 Ambient temperature; The second mathematical function model expression: in, For the flow valve opening control quantity, 0≤ ≤1; The compensation coefficient is used for system calibration. The valve's basic opening under rated operating conditions, 0≤ ≤1; The expression for the third mathematical function model is: in, The oil flow rate at the inlet of the filter element at temperature T; The flow coefficient of the flow regulating valve; The dynamic viscosity at temperature T; The pressure difference across the flow control valve; The expression for the fourth mathematical function model is: in, The outlet flow rate for the 25μm particle size segment of the dust screening module; This refers to the filter element inlet flow rate. The concentration of contaminants at the filter element inlet; The concentration of pollutants at the inlet of the dust screening device; The interception efficiency is 27μm sieve; The interception efficiency is 23μm sieve.

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