Impurity uniform filling device and method for aviation fuel filter test

Abstract

The invention relates to an impurity uniform filling device and method for aviation fuel filter testing, and relates to the field of filtering performance detection, the impurity uniform filling device comprises an impurity-containing aviation fuel storage device, and a first internal circulation unit and a second internal circulation unit which are communicated with the impurity-containing aviation fuel storage device; the first internal circulation unit comprises a first pump; the second internal circulation unit comprises a first valve, a second pump, a second valve, a third valve, a fourth valve and a fifth valve which are connected in sequence; a filling end is arranged between the third valve and the fourth valve; the material inlet pipe diameter in the filling end is larger than or equal to the material outlet pipe diameter; the fourth valve is connected with a hybrid aviation fuel storage device through a back pressure valve; and the hybrid aviation fuel storage equipment is provided with stirring equipment. The filling device provided by the invention ensures that solid particles in the pipeline can be uniformly dispersed in aviation kerosene to form uniform impurity liquid in the aviation kerosene filter testing process by introducing the double internal circulation pipelines and matching the multi-section filling design with the stirring equipment, so that the performance testing accuracy of the aviation kerosene filter is improved.

Description

Technical Field

[0001] The present invention relates to the field of filtration performance testing, and in particular to a device and method for uniformly filling impurities for testing aviation fuel filters, and in particular to a device and method for uniformly filling impurities for testing aviation fuel filters with a flow rate of more than 300 m 3 A device and method for uniformly filling impure aviation fuel at a rate of / h. Background Art

[0002] During the refining, storage and transportation of aviation kerosene, a certain amount of impurities will inevitably be mixed into it. Among them, the presence of solid impurities may cause problems such as pump wear, control valve jamming, oil filter blockage and nozzle erosion. These problems will not only accelerate the wear of equipment and shorten the service life of the engine, but in extreme cases, they may also cause the engine to stall and lead to serious safety accidents. Therefore, in order to ensure that strict usage standards are met, it is crucial to use filters to remove solid impurities before using aviation kerosene.

[0003] In order to scientifically evaluate the performance of the filter, when conducting filter performance assessment, the filter to be tested should be provided with continuous and appropriate pollutant injection. At the same time, the various filtering performance indicators of the filter should be monitored regularly to ensure the accuracy and reliability of the evaluation results.

[0004] For example, in GB / T 18853-2015 "Multiple-pass method for evaluating filter element filtration performance of hydraulic transmission filters", ISO intermediate test powder (ISO 12103-A3) is mixed into the test oil for mechanical agitation, and then ultrasonically dispersed to obtain a uniform mixed liquid for testing.

[0005] However, the amount of oil processed by the jet fuel filter is much larger than that of the hydraulic transmission filter, and the applicability of ultrasonic dispersion technology is limited. In addition, since the test powder of the jet fuel filter is a mixture of A1 powder and R9998 iron oxide dust, it is easy to settle in the jet fuel, which makes it more difficult to maintain uniform impurity filling during the test.

[0006] At present, impurity injection in the performance test of aviation fuel filters generally adopts the method of controlling the total amount of injection to evaluate its pollution holding capacity. However, due to the lack of process consistency, this method leads to poor repeatability and reproducibility of test results, which is not conducive to the accurate testing of aviation fuel filter performance. Summary of the invention

[0007] In view of the problems existing in the prior art, the purpose of the present invention is to provide a device and method for uniformly filling impurities for aviation kerosene filter testing, so as to solve the problem that impurities are difficult to fill uniformly during the current aviation kerosene filter performance test, resulting in poor repeatability and reproducibility of test results, and impurities cannot be effectively injected according to a predetermined concentration under high flow conditions in the aviation kerosene pipeline, thereby causing insufficient accuracy in the aviation kerosene filter performance test.

[0008] To achieve this object, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides an impurity uniform filling device for aviation fuel filter testing, the impurity uniform filling device comprising:

[0010] A storage device for impure aviation fuel, a first internal circulation unit and a second internal circulation unit connected to the storage device for impure aviation fuel;

[0011] The first internal circulation unit includes a first pump connected to the impure aviation fuel storage equipment;

[0012] The second internal circulation unit comprises a first valve, a second pump, a second valve, a third valve, a fourth valve and a fifth valve connected in sequence;

[0013] At least one filling port is provided between the third valve and the fourth valve;

[0014] The diameter of the material inlet pipe at the filling end is ≥ the diameter of the material outlet pipe;

[0015] The fourth valve is connected to the impure aviation fuel storage equipment via a back pressure valve;

[0016] The impure aviation fuel storage equipment is equipped with a stirring device.

[0017] The impurity uniform filling device provided by the present invention ensures that the solid particles in the pipeline can be evenly dispersed in the aviation kerosene to form a uniform impurity liquid, thereby ensuring the repeatability and reproducibility of the test results and improving the accuracy of the aviation kerosene filter performance test.

[0018] As a preferred technical solution of the present invention, the filling end includes a reducer interface, a sixth valve, a flow meter, a seventh valve and an eighth valve which are connected in sequence.

[0019] Preferably, the eighth valve is connected to the aviation fuel testing pipeline and the sampling end respectively through a three-way valve.

[0020] Preferably, the aviation fuel testing pipeline is provided with a sampling port.

[0021] As a preferred technical solution of the present invention, the first pump is connected to the return port and the discharge port of the impure aviation fuel storage equipment through pipelines.

[0022] Preferably, the first valve is connected to a discharge port of a storage device for impure aviation fuel.

[0023] Preferably, the fifth valve is connected to a return port of the impure aviation fuel storage device.

[0024] Preferably, the back pressure valve is connected to a return port of the impure aviation fuel storage device.

[0025] Preferably, the impure aviation kerosene storage equipment is provided with an aviation kerosene inlet end and an impurity inlet end.

[0026] Preferably, the aviation fuel feeding end is provided with a metering device.

[0027] Preferably, the impurity feeding end is provided with a metering device.

[0028] As a preferred technical solution of the present invention, a discharge port is arranged at the bottom of the impure aviation fuel storage device.

[0029] As a preferred technical solution of the present invention, the impure aviation fuel storage equipment is equipped with a liquid level detection device.

[0030] As a preferred technical solution of the present invention, the first pump includes a centrifugal pump.

[0031] Preferably, the second pump comprises a positive displacement pump.

[0032] In a second aspect, the present invention provides a method for uniformly filling impurities for testing the performance of aviation fuel filters, the method comprising:

[0033] Connect the first internal circulation unit, close the second internal circulation unit to perform the first internal circulation and start the stirring device in the impure aviation fuel storage device; then maintain the first internal circulation and connect the second internal circulation unit to perform the second internal circulation;

[0034] After the second internal circulation is completed, only the fifth valve is closed and the back pressure valve is opened, and then the filling end is connected to fill the impure aviation fuel.

[0035] As a preferred technical solution of the present invention, the second internal circulation is started after the first internal circulation is carried out for ≥20 minutes, and the first internal circulation is kept running.

[0036] As a preferred technical solution of the present invention, the connecting filling end includes: opening the sixth valve, the seventh valve and the eighth valve, and then switching the three-way valve in sequence to connect the sampling end and / or the aviation fuel test pipeline.

[0037] As a preferred technical solution of the present invention, the connected sampling end is used for flushing the filling end or sampling.

[0038] Compared with the prior art solutions, the present invention has the following beneficial effects:

[0039] (1) The impurity uniform filling device provided by the present invention adopts a combination of double internal circulation and stirring equipment, and uses a second pump to keep the Reynolds number in the pipeline above 2500. Impurities are not easy to settle in the pipeline, and solid particles are evenly dispersed in the aviation kerosene to form an impurity liquid, thereby achieving uniform filling of impurities.

[0040] (2) The impurity uniform filling device provided by the present invention is configured with a back pressure valve and a reducer interface to make the flow rate of the aviation fuel pipeline greater than 300m 3 / h, the impurity liquid can also be stably injected into the aviation fuel pipeline. At the same time, with the help of multi-stage filling design and back pressure control, uniform filling of solids and impurities from small flow to large flow can be achieved.

[0041] (3) The uniform impurity filling device provided by the present invention can realize automatic control of the filling flow rate according to the set concentration and the flow value automatically collected by the data acquisition system through the calculation and control system, thereby realizing automatic filling of the aviation fuel pipeline with a fixed uniform impurity concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of an impurity uniform filling device for aviation fuel filter testing provided by an embodiment of the present invention.

[0043] In the figure: 110 - storage equipment for impure aviation fuel, 111 - stirring equipment, 120 - discharge port, 200 - first pump, 310 - first valve, 320 - second pump, 330 - second valve, 340 - third valve, 350 - fourth valve, 360 - fifth valve, 370 - back pressure valve, 410 - reducing interface, 420 - sixth valve, 430 - flow meter, 440 - seventh valve, 450 - eighth valve, 460 - three-way valve, 500 - aviation fuel test pipeline, 600 - sampling end.

[0044] The present invention is further described in detail below. However, the following examples are only simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims. DETAILED DESCRIPTION

[0045] To better illustrate the present invention and facilitate understanding of the technical solution of the present invention, typical but non-limiting embodiments of the present invention are as follows:

[0046] This embodiment provides an impurity uniform filling device for aviation fuel filter testing, such as Figure 1 As shown, the impurity uniform filling device includes:

[0047] A storage device for impure aviation fuel 110, a first internal circulation unit and a second internal circulation unit connected to the storage device for impure aviation fuel 110;

[0048] The first internal circulation unit includes a first pump 200 connected to the impure aviation fuel storage device 110;

[0049] The second internal circulation unit includes a first valve 310, a second pump 320, a second valve 330, a third valve 340, a fourth valve 350 and a fifth valve 360 ​​connected in sequence;

[0050] At least one filling port is provided between the third valve 340 and the fourth valve 350;

[0051] The diameter of the material inlet pipe at the filling end is ≥ the diameter of the material outlet pipe;

[0052] The fourth valve 350 is connected to the impure aviation fuel storage device 110 via a back pressure valve 370;

[0053] The impure aviation fuel storage device 110 is equipped with a stirring device 111 .

[0054] In the present invention, impurities in the impurity-containing aviation kerosene storage device 110 are added specifically according to test requirements, such as impurities generated by the use environment of aviation kerosene and impurities originally contained, such as A1 standard dust, iron oxide dust, etc.

[0055] In the present invention, after the first pump 200 is turned on, the impure jet fuel in the impure jet fuel storage device 110 is circulated through the pipeline to achieve the first internal circulation; the first valve 310, the second pump 320, the second valve 330, the third valve 340, the fourth valve 350 and the fifth valve 360 ​​are connected, and the second pump 320 is turned on to achieve the second internal circulation of the impure jet fuel in the impure jet fuel storage device 110. When performing the first internal circulation and the second internal circulation, the stirring device 111 in the impure jet fuel storage device 110 can be simultaneously turned on to achieve uniform mixing of solid impurities and jet fuel.

[0056] In the present invention, the stirring device 111 can be designed according to the conventional requirements in the field, such as selecting an axial flow agitator (such as a propulsion type, a screw type, etc.), a radial flow agitator (such as a blade combination type, a pan-energy type, etc.) and a mixed flow agitator (such as a six-fold blade open turbine type, etc.).

[0057] The filling end includes a reducer interface 410, a sixth valve 420, a flow meter 430, a seventh valve 440 and an eighth valve 450 which are connected in sequence.

[0058] In the present invention, the filling end can ensure that the filling port is within 6-600m by introducing the variable diameter interface 410. 3 / h flow span with high precision filling of fixed uniform impurity concentration. For example, when filling with a large flow rate, the diameter of the pipe at the filling end is reduced synchronously through the reducer interface 410 to better match the flow rate, thereby improving the accuracy of flow control during the filling process. Furthermore, in conjunction with the back pressure valve 370, it can ensure that impurities can be effectively added when the aviation kerosene is tested for a large flow rate, avoiding the problem of impurities not being able to be added due to excessive flow of aviation kerosene.

[0059] In the present invention, the variable diameter interface 410 refers to a pipe whose diameter gradually decreases to a certain diameter along the material flow direction.

[0060] In the present invention, the filling end can select different filling pipelines according to the filter tests with different rated flow rates, and these filling pipelines can more accurately control the flow rate of impure aviation fuel through the variable diameter interface 410.

[0061] In the present invention, the flow rate in the relevant pipeline is monitored by the flow meter 430, thereby ensuring the control of the flow rate during the filling process.

[0062] The eighth valve 450 is connected to the aviation fuel testing pipeline 500 and the sampling end 600 respectively through the three-way valve 460 .

[0063] In the present invention, the sampling end 600 is used to confirm whether the sample containing impurities is uniformly fed into the sample adding end, and whether there is residual liquid in the pipeline after the test is completed.

[0064] The jet fuel test pipeline 500 is provided with a sampling port, and a sampling port may be optionally provided in the jet fuel test pipeline 500 to perform online sampling during the test to confirm whether the final injection concentration of impurities reaches the required concentration.

[0065] The first pump 200 is connected to the return port and the discharge port of the impure aviation fuel storage device 110 through pipelines.

[0066] The first valve 310 is connected to the discharge port of the impure aviation fuel storage device 110 .

[0067] The fifth valve 360 ​​is connected to the return port of the impure aviation fuel storage device 110 .

[0068] The back pressure valve 370 is connected to the return port of the impure aviation fuel storage device 110 .

[0069] The impure aviation kerosene storage device 110 is provided with an aviation kerosene inlet and an impurity inlet.

[0070] Wherein, the aviation fuel feeding end is equipped with a metering device.

[0071] Wherein, the impurity feeding end is equipped with a metering device.

[0072] In the present invention, the impure jet fuel storage device 110 is provided with a jet fuel feeding end and an impurity feeding end for feeding jet fuel and impurities. The jet fuel feeding end and the impurity feeding end are synchronously provided with metering equipment such as flow meters, scales and other metering equipment for determining the feeding amount of jet fuel and impurities, thereby ensuring that the impure jet fuel meets the requirements. Of course, the mixed impure jet fuel can also be directly injected into the impure jet fuel storage device 110, and then mixed and injected.

[0073] The bottom of the impure aviation fuel storage device 110 is provided with a discharge port 120 .

[0074] In the present invention, a discharge port 120 is disposed at the bottom of the impure aviation fuel storage device 110 for discharging and cleaning the impurity filling liquid.

[0075] The impure jet fuel storage equipment 110 is provided with a liquid level detection device.

[0076] In the present invention, the liquid level detection device configured for the impure jet fuel storage device 110 is used to detect the height of the liquid level in the impure jet fuel storage device 110 to avoid insufficient addition due to too low liquid level, which cannot ensure the effective performance test of the jet fuel filter. The design position of the liquid level detection device can be reasonably designed according to actual monitoring needs.

[0077] Wherein, the first pump 200 includes a centrifugal pump.

[0078] Wherein, the second pump 320 comprises a volumetric pump.

[0079] In the present invention, the first valve 310, the third valve 340, the fourth valve 350, the fifth valve 360, the sixth valve 420, and the seventh valve 440 can all be switch valves, and can be manual valves or electric control valves according to actual needs.

[0080] In the present invention, the second valve 330 and the eighth valve 450 are corresponding one-way valves to prevent the material from flowing back.

[0081] In the present invention, the valves, stirring equipment 111, pump, flow meter 430, liquid level detection equipment, etc. in the filling device can be connected to the host computer to realize the automatic operation of the filling device, and further realize the intelligent operation of the filling device by designing a logic control process combined with a big data model. For example, according to the set concentration, combined with the flow value automatically collected by the data acquisition system, the automatic control of the filling flow is realized through the calculation and control system.

[0082] Furthermore, the present invention provides a method for uniformly filling impurities for testing the performance of aviation fuel filters, the method comprising:

[0083] The first internal circulation unit is connected, the second internal circulation unit is closed to perform the first internal circulation, and the stirring device 111 in the impure aviation fuel storage device 110 is turned on; then the first internal circulation is maintained, and the second internal circulation unit is connected to perform the second internal circulation;

[0084] After the second internal circulation is completed, only the fifth valve 360 ​​is closed and the back pressure valve 370 is opened, and then the filling end is connected to fill the impure aviation fuel.

[0085] Wherein, the second internal circulation is started after the first internal circulation is carried out for ≥20 minutes, and the first internal circulation is kept running.

[0086] The connecting to the filling end includes: opening the sixth valve 420 , the seventh valve 440 and the eighth valve 450 , and then switching the three-way valve 460 to connect to the sampling end 600 and / or the aviation fuel testing pipeline 500 .

[0087] The connecting sampling end 600 is used for flushing the filling end or sampling.

[0088] In the present invention, the time for the second internal circulation is reasonably designed based on the actual mixed solid particles and aviation kerosene, and is exemplarily ≥30 min, for example, it can be 30 min, 40 min, 50 min, 60 min, 70 min, 80 min, 90 min, 100 min, 110 min or 120 min, etc., but is not limited to the listed values, and other values ​​not listed within the range also meet the requirements.

[0089] Further, in order to illustrate the good filling effect that can be achieved by the impurity uniform filling device provided by the present invention, the following actual examples are used for illustration, as follows:

[0090] Example 1

[0091] This embodiment provides an impurity uniform filling device for aviation fuel filter testing, which is specifically as follows: The impurity uniform filling device includes:

[0092] A storage device for impure aviation fuel, a first internal circulation unit and a second internal circulation unit connected to the storage device for impure aviation fuel;

[0093] The first internal circulation unit includes a first pump connected to the impure aviation fuel storage equipment;

[0094] The second internal circulation unit comprises a first valve, a second pump, a second valve, a third valve, a fourth valve and a fifth valve connected in sequence;

[0095] At least one filling port is provided between the third valve and the fourth valve;

[0096] The diameter of the material inlet pipe at the filling end is ≥ the diameter of the material outlet pipe;

[0097] The fourth valve is connected to the impure aviation fuel storage equipment via a back pressure valve;

[0098] The impure aviation fuel storage equipment is equipped with a stirring device.

[0099] In this embodiment, the impurities in the impurity-containing aviation fuel storage equipment are a mixture of A1 standard dust and iron oxide dust.

[0100] In this embodiment, after the first pump is turned on, the impure jet fuel in the impure jet fuel storage device is circulated through the pipeline to achieve the first internal circulation; the first valve, the second pump, the second valve, the third valve, the fourth valve and the fifth valve are connected, and the second pump is turned on to achieve the second internal circulation. When performing the first internal circulation and the second internal circulation, the stirring equipment in the impure jet fuel storage device can be turned on simultaneously to achieve uniform mixing of solid impurities and jet fuel.

[0101] Wherein, the first pump is connected to the return port and the discharge port of the impurity aviation fuel storage equipment through pipelines; the first valve is connected to the discharge port of the impurity aviation fuel storage equipment; the fifth valve is connected to the return port of the impurity aviation fuel storage equipment; the back pressure valve is connected to the return port of the impurity aviation fuel storage equipment;

[0102] Wherein, the impure aviation kerosene storage equipment is equipped with an aviation kerosene feeding end and an impurity feeding end; the aviation kerosene feeding end is equipped with a metering device; and the impurity feeding end is equipped with a metering device.

[0103] In this embodiment, the filling end includes a reducing interface, a sixth valve, a flow meter, a seventh valve and an eighth valve which are connected in sequence.

[0104] In this embodiment, the filling end can ensure that the filling port is within 6-600m 3 / h flow span with high precision filling of fixed uniform impurity concentration, through the variable diameter interface, the pipe diameter at the filling end is changed synchronously to better match the flow rate, thereby improving the accuracy of flow control during the filling process.

[0105] Wherein, the eighth valve is connected to the aviation fuel test pipeline and the sampling end respectively through a three-way valve; the aviation fuel test pipeline is equipped with a sampling port.

[0106] Wherein, a discharge port is arranged at the bottom of the impure jet fuel storage device for discharging the impurity filling liquid.

[0107] The impure jet fuel storage device is provided with a liquid level detection device for detecting the liquid level in the impure jet fuel storage device to avoid insufficient addition due to too low a liquid level, which would make it impossible to ensure the effective performance test of the jet fuel filter.

[0108] Wherein, the first pump is a centrifugal pump.

[0109] Wherein, the second pump comprises a volumetric pump.

[0110] In this embodiment, the first valve, the third valve, the fourth valve, the fifth valve, the sixth valve and the seventh valve used are switch valves, which are electrically controlled valves.

[0111] In this embodiment, the second valve and the eighth valve are corresponding one-way valves to prevent the material from flowing back.

[0112] Furthermore, the specific filling process is as follows:

[0113] Connect the first internal circulation unit, close the second internal circulation unit to perform the first internal circulation and start the stirring device in the impure aviation fuel storage device; then maintain the first internal circulation and connect the second internal circulation unit to perform the second internal circulation;

[0114] After the second internal circulation is completed, only the fifth valve is closed and the back pressure valve is opened, and then the filling end is connected to fill the impure aviation fuel.

[0115] Wherein, the second internal circulation starts after the first internal circulation is carried out for 30 minutes, and the first internal circulation keeps running; the filling starts after the second internal circulation is carried out for 50 minutes;

[0116] Wherein, the connecting filling end includes: opening the sixth valve, the seventh valve and the eighth valve, and then switching the three-way valve in sequence to connect the sampling end and / or the aviation fuel test pipeline.

[0117] Wherein, the connected sampling end is used for flushing the filling end or sampling.

[0118] The above filling process is used to carry out the jet fuel flow rate of 6m 3 / h、150m 3 / h、360m 3 / h、540m 3 / h, and 600m 3 / h of impurities, sampling was performed every 15 minutes in the aviation fuel pipeline after impurities were added under each flow condition, and a total of 5 filling samples were taken to analyze the content of solid particles in the filling samples. Specifically, the concentration of the filling samples was determined according to the ASTM D 2276 solid particle contamination online determination method. Further, a comparative example is provided to illustrate the advantages of the design of the internal circulation pipeline and the mixing equipment in the present invention. The comparative example is as follows:

[0119] Comparative Example 1

[0120] The stirring device is not turned on during the filling process.

[0121] Comparative Example 2

[0122] During the filling process, the fourth valve is closed, that is, the internal circulation pipeline design is not formed, and the back pressure valve is invalid at this time.

[0123] Comparison Example 3

[0124] During the filling process, the pipe diameter of the filling end is not changed through the reducing interface, that is, the pipe diameter of the filling end is not reduced through the reducing interface, and the pipe diameter for the material to enter and flow out of the filling end is kept unchanged.

[0125] The specific results are shown in Table 1 below.

[0126] Table 1

[0127]

[0128]

[0129] As can be seen from Table 1, the filling device provided by the present invention, by designing the filling device, introduces an internal circulation pipeline and a stirring device to cooperate, thereby ensuring that the solid particles in the pipeline can be evenly dispersed in the aviation kerosene to form a uniform impurity liquid, thereby ensuring the repeatability and reproducibility of the test results, and realizing the improvement of the accuracy of the aviation kerosene filter performance test.

[0130] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0131] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0132] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An impurity uniform filling device for aviation fuel filter testing, characterized in that: The impurity uniform filling device comprises: A storage device for impure aviation fuel, a first internal circulation unit and a second internal circulation unit connected to the storage device for impure aviation fuel; The first internal circulation unit includes a first pump connected to the impure aviation fuel storage equipment; The second internal circulation unit comprises a first valve, a second pump, a second valve, a third valve, a fourth valve and a fifth valve connected in sequence; At least one filling port is provided between the third valve and the fourth valve; The diameter of the material inlet pipe at the filling end is ≥ the diameter of the material outlet pipe; The fourth valve is connected to the impure aviation fuel storage equipment via a back pressure valve; The impure aviation fuel storage equipment is equipped with a stirring device.

2. The impurity uniform filling device according to claim 1, characterized in that: The filling end includes a reducing interface, a sixth valve, a flow meter, a seventh valve and an eighth valve connected in sequence; Preferably, the eighth valve is connected to the aviation fuel test pipeline and the sampling end respectively through a three-way valve; Preferably, the aviation fuel testing pipeline is provided with a sampling port.

3. The impurity uniform filling device according to claim 2, characterized in that: The first pump is connected to the return port and the discharge port of the impure aviation fuel storage device through pipelines; Preferably, the first valve is connected to the discharge port of the impure aviation fuel storage device; Preferably, the fifth valve is connected to the return port of the impure aviation fuel storage device; Preferably, the back pressure valve is connected to the return port of the impure aviation fuel storage equipment; Preferably, the impure aviation fuel storage equipment is equipped with an aviation fuel inlet end and an impurity inlet end; Preferably, the aviation fuel feeding end is provided with a metering device; Preferably, the impurity feeding end is provided with a metering device.

4. The impurity uniform filling device according to claim 1, characterized in that: The bottom of the impure aviation fuel storage device is provided with a discharge port.

5. The impurity uniform filling device according to claim 1, characterized in that: The impure jet fuel storage equipment is equipped with a liquid level detection device.

6. The impurity uniform filling device according to claim 1, characterized in that: The first pump comprises a centrifugal pump; Preferably, the second pump comprises a positive displacement pump.

7. A method for uniformly filling impurities for aviation fuel filter testing, characterized in that: The impurity uniform injection method comprises: Connect the first internal circulation unit, close the second internal circulation unit to perform the first internal circulation and start the stirring device in the impure aviation fuel storage device; then maintain the first internal circulation and connect the second internal circulation unit to perform the second internal circulation; After the second internal circulation is completed, only the fifth valve is closed and the back pressure valve is opened, and then the filling end is connected to fill the impure aviation fuel.

8. The method for uniformly injecting impurities according to claim 7, characterized in that: The second internal circulation is started after the first internal circulation is performed for ≥20 minutes, and the first internal circulation is kept running.

9. The method for uniformly injecting impurities according to claim 7, characterized in that: The connecting the filling end includes: opening the sixth valve, the seventh valve and the eighth valve, and then switching the three-way valve in sequence to connect the sampling end and / or the aviation fuel test pipeline.

10. The method for uniformly injecting impurities according to claim 7, characterized in that: The connected sampling end is used for flushing the filling end or sampling.

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