Sonic nozzle positive pressure detection pneumatic system and fuel nozzle blockage degree screening method

Abstract

The present invention provides a sonic nozzle positive pressure detection pneumatic system and a method for screening the degree of fuel nozzle blockage, comprising an air intake interface assembly, a switch valve, an air circuit safety valve assembly, a gas filter assembly, a pressure regulating valve, a sonic nozzle test tube assembly, a pressure sensor and an air outlet interface assembly; the air circuit safety valve assembly comprises a first air circuit safety valve assembly and a second air circuit safety valve assembly; the air intake interface assembly is sequentially connected with the switch valve, the first air circuit safety valve assembly, the gas filter assembly, the pressure regulating valve, the sonic nozzle test tube assembly, the second air circuit safety valve assembly and the air outlet interface assembly; the sonic nozzle test tube assembly is provided with a pressure sensor. The present invention has a simple and reasonable structure, high test accuracy and strong versatility. The sonic nozzle test tube assembly can detect the degree of fuel nozzle blockage, and the air circuit safety valve assembly is respectively provided upstream and downstream of the sonic nozzle test tube assembly to ensure the safety of components in the air circuit and operators.

Description

Technical Field

[0001] The present invention relates to the technical field of engine equipment detection, in particular to a sonic nozzle positive pressure detection pneumatic system and a fuel nozzle blockage degree screening method, and in particular to a method for detecting and screening the blockage degree of fuel nozzles of aircraft engines and a sonic nozzle positive pressure detection pneumatic system. Background Art

[0002] The combustion chamber is one of the three core components of an aircraft engine. The performance of the combustion chamber directly determines the output and emissions of the entire engine. The combustion chamber is mainly composed of several fuel nozzles, up to dozens of them, which are arranged in a ring in the combustion chamber. When working, under the action of the control system, gas or liquid fuel is accurately supplied to the combustion chamber through each fuel nozzle, and fully mixed with the compressed air from the front end, and ignited and burned under the stimulation of the igniter, ensuring that the engine can start smoothly and work under various loads.

[0003] Whether there are more or less impurities in the fuel or compressed air, as the engine runs for an extended period of time, the internal flow path of each fuel nozzle will become clogged, especially in aircraft engines where the flow paths are smaller and the combustion temperature is higher, making it more prone to clogging. Moreover, the degree of clogging of each fuel nozzle is different, but the compressed air supplied is the same. In this case, the degree of combustion of each fuel nozzle is different, which will cause high-frequency vibration of the engine due to the uneven distribution of the annular temperature field, and emissions will also increase significantly. Therefore, it is necessary to detect the degree of clogging of the fuel nozzle based on whether the two parameters, the dispersion of the combustion chamber temperature field and the output of the engine, are abnormal, and select the fuel nozzles with excessive clogging for cleaning or replacement, so as to ensure the performance of the entire engine in a timely and effective manner.

[0004] After searching the prior art, the patent document with publication number CN110146298A discloses an engine fuel system test device and method, which is mainly composed of an air supply component, a pressure reducing component, a voltage stabilizing component and a test component, wherein the core test component adopts a high-precision flow meter. If this technology is applied to the blockage detection of the fuel nozzle of an aircraft engine, it still has the disadvantages of low test accuracy, too large test flow, complex system, inconvenient operation and short maintenance cycle. In addition, the patent document with publication number CN109724789A discloses an aero-modified gas turbine fuel nozzle flow test system and method, the core of which is the use of a differential pressure reducing valve. The test accuracy of this technology is low, and the differential pressure reducing valve needs to be customized according to specific applications rather than standards. The patent document with the publication number of CN103323230A discloses a gas combustion nozzle test method and device, which connects the combustible gas and high-pressure air to the tested nozzle and generates a vortex-shaped saturated mixed gas in the nozzle. When encountering the electric spark emitted by the pulse igniter, combustion is generated to form a torch, the color, length and shape of the flame are observed, and the maximum temperature of the flame and the content of harmful gases discharged into the air are detected by sensors, so as to provide a design basis for the application of such combustion nozzles. The patent document can objectively evaluate and judge the advantages and disadvantages of the nozzle structure design, and can find the best air-fuel ratio of various nozzles or a single nozzle. However, the fuel nozzle in the patent document will still be blocked, and the vibration caused by the blockage cannot be avoided. The above three patent documents cannot screen the fuel nozzle, analyze the blockage degree of the nozzle and judge whether the fuel nozzle is usable after being blocked, and do not use the sonic nozzle structure for detection. The sonic nozzle can meet the calibration of different types of flow meters, and has the characteristics of low inaccuracy, wide range, high degree of automation, many types of instruments to be tested, and novel structure. Summary of the invention

[0005] In view of the defects in the prior art, the object of the present invention is to provide a sonic nozzle positive pressure detection pneumatic system and a method for screening the degree of fuel nozzle blockage.

[0006] According to one aspect of the present invention, there is provided a sonic nozzle positive pressure detection pneumatic system, comprising an air inlet interface assembly, a switch valve, an air circuit safety valve assembly, a gas filter assembly, a pressure regulating valve, a sonic nozzle test tube assembly, a pressure sensor, and an air outlet interface assembly;

[0007] The gas circuit safety valve assembly comprises a first gas circuit safety valve assembly and a second gas circuit safety valve assembly;

[0008] The air inlet interface assembly is sequentially connected to the switch valve, the first air path safety valve assembly, the gas filter assembly, the pressure regulating valve, the sonic nozzle test tube assembly, the second air path safety valve assembly, and the air outlet interface assembly;

[0009] The sonic nozzle test tube set is provided with a pressure sensor.

[0010] Preferably, the air inlet interface assembly and the air outlet interface assembly both include an interface assembly;

[0011] The interface assembly includes a one-way valve, a quick connector and a conversion connector, one end of the quick connector is connected to the one-way valve and one end of the conversion connector in sequence;

[0012] In the air inlet interface assembly, the other end of the quick connector can be connected to the external air supply system, and the other end of the conversion connector is connected to the switch valve;

[0013] In the air outlet interface assembly, the other end of the quick connector can be connected to the detection system to be tested, and the other end of the conversion connector is connected to the second air path safety valve assembly.

[0014] Preferably, the first gas circuit safety valve assembly and the second gas circuit safety valve assembly both include a three-way connector and a safety valve;

[0015] In the first gas path safety valve assembly, the three ends of the three-way connector are respectively connected to the switch valve, the gas filter assembly, and the safety valve;

[0016] In the second gas path safety valve assembly, the three ends of the three-way joint are respectively connected to the sonic nozzle test tube group, the gas outlet interface assembly, and the safety valve.

[0017] Preferably, the gas filter assembly includes a solid particle filter and a liquid filter, one end of the solid particle filter is connected to the first gas circuit safety valve assembly, the other end of the solid particle filter is connected to one end of the liquid filter, and the other end of the liquid filter is connected to the pressure regulating valve.

[0018] Preferably, the sonic nozzle test tube set comprises a rectifier, an air inlet straight pipe section, a sonic nozzle and an air outlet straight pipe section;

[0019] One end of the rectifier is connected to the air inlet straight pipe section, the sonic nozzle, and one end of the air outlet straight pipe section in sequence, the other end of the rectifier is connected to the pressure regulating valve, and the other end of the air outlet straight pipe section is connected to the second air path safety valve assembly.

[0020] Preferably, one or more pressure equalizing rings are provided on the air inlet straight pipe section, and one or more pressure equalizing rings are provided on the air outlet straight pipe section;

[0021] A pressure sensor is provided on a pressure equalizing ring of the air inlet straight pipe section and a pressure equalizing ring of the air outlet straight pipe section.

[0022] Preferably, it further comprises a hose assembly, wherein the hose assembly comprises a first hose assembly, a second hose assembly and a third hose assembly;

[0023] The pressure regulating valve is connected to the sonic nozzle test tube group through a first hose assembly, the sonic nozzle test tube group is connected to the pressure sensor through a second hose assembly, and the sonic nozzle test tube group is connected to the second gas path safety valve assembly through a third hose assembly.

[0024] Preferably, the first hose assembly, the second hose assembly and the third hose assembly all include a front quick connector, a hose and a terminal quick connector, and the front quick connector is connected to the hose and the terminal quick connector in sequence.

[0025] According to another aspect of the present invention, a method for screening the degree of blockage of a fuel nozzle is provided, which uses the sonic nozzle positive pressure detection pneumatic system for detection and screening, and comprises the following steps:

[0026] Step 1: Detect the positive pressure of the sonic nozzle to check whether the pneumatic system is blocked;

[0027] Step 2: Detect multiple new fuel nozzles to obtain pressure sensor readings P1 on multiple intake straight pipe sections;

[0028] Step 3: Detect multiple old fuel nozzles; obtain pressure sensor readings P2 on multiple intake straight pipe sections;

[0029] Step 4: defining a basic reference value, a P upper limit value, and a P lower limit value according to a plurality of P1s and P2s, and screening old fuel nozzles according to the basic reference value, the P upper limit value, and the P lower limit value;

[0030] The steps 1, 2, 3 and 4 are performed in sequence, or the steps 1, 3, 2 and 4 are performed in sequence.

[0031] Preferably, the step 1 is specifically:

[0032] Open the switch valve and the pressure regulating valve to the ON position, and observe whether the pressure sensor readings on the air inlet and outlet straight pipe sections are atmospheric pressure values, and whether the difference between the two pressure sensor readings is within the set range;

[0033] If the readings of the two pressure sensors are not atmospheric pressure values ​​or the difference between the two pressure sensor readings is large and is not within the set range, it is determined that the initial setting of the pressure sensor is improper or the internal pipeline of the speed nozzle positive pressure detection pneumatic system is blocked. This fault needs to be eliminated until the readings of the two pressure sensors are atmospheric pressure values ​​and the difference between the two pressure sensor readings is within the set range;

[0034] If the readings of the two pressure sensors are atmospheric pressure values, and the difference between the readings of the two pressure sensors is within the set range, proceed to step 2 or step 3 to continue;

[0035] The step 2 comprises the following steps:

[0036] Step 2.1: Pre-set the pressure value of the gas line safety valve assembly, then adjust the switch valve to the OFF position, and rotate the pressure regulating valve to the minimum pressure position;

[0037] Step 2.2: Connect the air inlet interface assembly to the external air supply system, and connect the air outlet interface assembly to the first new fuel nozzle;

[0038] Step 2.3: Open the switch valve to the ON position, rotate the pressure regulating valve toward the maximum pressure position until the pressure sensor reading on the outlet straight pipe section reaches the set value, and read the pressure sensor reading P1 on the inlet straight pipe section;

[0039] Step 2.4: Close the switch valve to the OFF position, rotate the pressure regulating valve to the minimum pressure position, disconnect the air outlet interface assembly from the first new fuel nozzle, and connect the air outlet interface assembly to the second new fuel nozzle, and repeat step 2.3;

[0040] Step 2.5: Repeat step 2.4 to complete the detection of multiple new fuel nozzles and obtain multiple P1 values;

[0041] The step 3 comprises the following steps:

[0042] Step 3.1: The pressure value of the gas circuit safety valve assembly is a preset value, the gas interface assembly is connected to the external gas supply system, and the gas outlet interface assembly is connected to the first old fuel nozzle;

[0043] Step 3.2: Open the switch valve to the ON position, rotate the pressure regulating valve toward the maximum pressure position until the pressure sensor reading on the outlet straight pipe section reaches the set value, and read the pressure sensor reading P2 on the inlet straight pipe section;

[0044] Step 3.3: Close the switch valve to the OFF position, rotate the pressure regulating valve to the minimum pressure position, disconnect the air outlet interface assembly from the first old fuel nozzle, and connect the air outlet interface assembly to the second old fuel nozzle, and repeat step 3.2;

[0045] Step 3.4: Repeat step 3.3 to complete the detection of multiple old fuel nozzles and obtain multiple P2 values;

[0046] The step 4 comprises the following steps:

[0047] Step 4.1: Take the average of multiple P1 values ​​and record it as P 标准值 , P 标准值 ×0.9 as the basic reference value; take the average of multiple P2 values ​​and record it as P2 平均值 ; P2 平均值 ×(1+2%) as P 上限值 , P2 平均值 ×(1-2%) as P 下限值 ; According to the basic reference value, P上限值 and P 下限值 Screening of old fuel nozzles;

[0048] Step 4.2: Compare the P2 value of the old fuel nozzle with the basic reference value. If the P2 value is less than the basic reference value, the old fuel nozzle is unqualified; if the P2 value is greater than or equal to the basic reference value, execute step 4.3;

[0049] Step 4.3: Compare the P2 value with P 上限值 and P 下限值 Compare; if P 上限值 ≥P2≥P 下限值 , then the old fuel nozzle is qualified; if P2<P 下限值 Or P2>P 上限值 , then the old fuel nozzle is unqualified.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] 1. The present invention has a simple and reasonable structure, high test accuracy, and strong versatility. The sonic nozzle test tube group can detect the degree of blockage of the fuel nozzle. Gas circuit safety valve assemblies are respectively arranged upstream and downstream of the sonic nozzle test tube group to ensure the safety of components in the gas circuit and operators.

[0052] 2. The present invention sets pressure sensors at the upstream and downstream of the sonic nozzle test tube group respectively, and reflects the gas mass flow rate through the fuel nozzle by reading the reading of the upstream pressure sensor, which is easy to use; the sonic nozzle test tube group includes a rectifier and a pressure equalizing ring, which makes the test more accurate.

[0053] 3. The present invention sets a gas filter assembly upstream of the air intake, filters the particles and moisture contained in the gas through the solid particle filter and the liquid filter in the gas filter assembly, adopts two-stage filtration, improves the purity of the test gas, and fully guarantees the detection accuracy.

[0054] 4. The sonic nozzle test tube set of the present invention has no moving parts, high detection accuracy, easy to ensure long-term accuracy, and long service life; the present invention adopts quick connectors for connection between internal pipelines and external systems, and the connection is efficient and reliable, and easy to replace, and can realize blockage detection of different types of fuel nozzles.

[0055] 5. The present invention provides an air source with a higher pressure than the atmospheric pressure through an external air supply system, uses a positive pressure method to make the sonic nozzle work at a sonic state, and then uses the sonic characteristics of the sonic nozzle test tube group to quickly complete the fuel nozzle blockage detection. 上限值 and P 下限值By comparison, the blockage degree of the fuel nozzle can be detected, and unqualified fuel nozzles can be detected and screened out efficiently and accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0057] Figure 1 It is the principle diagram of the sonic nozzle positive pressure detection pneumatic system of the present invention.

[0058] Figure 2 It is a structural schematic diagram of the sonic nozzle test tube group of the present invention.

[0059] Figure 3 It is a schematic diagram of the analysis of fuel nozzle blockage screening according to the present invention.

[0060] The figure shows:

[0061] Air inlet interface assembly 1 Safety valve 32

[0062] On / off valve 2 Solid particle filter 41

[0063] Gas line safety valve assembly 3 Liquid filter 42

[0064] Gas filter assembly 4 Front quick connector 61

[0065] Pressure regulating valve 5 Hose 62

[0066] Hose assembly 6 end quick connector 63

[0067] Sonic nozzle test tube set 7 rectifier 71

[0068] Pressure sensor 8 Intake straight pipe section 72

[0069] Air outlet interface assembly 9 First pressure equalizing ring 73

[0070] One-way valve 11 Second pressure equalizing ring 74

[0071] Quick connector 12 Sonic nozzle 75

[0072] Conversion joint 13 Air outlet straight pipe section 76

[0073] Tee joint 31 Third pressure equalizing ring 77 DETAILED DESCRIPTION

[0074] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0075] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0076] According to one aspect of the present invention, a sonic nozzle positive pressure detection pneumatic system is provided. Figure 1 As shown, it includes an air inlet interface assembly 1, a switch valve 2, a gas circuit safety valve assembly 3, a gas filter assembly 4, a pressure regulating valve 5, a sonic nozzle test tube assembly 7, a pressure sensor 8 and an air outlet interface assembly 9; the air circuit safety valve assembly 3 includes a first air circuit safety valve assembly and a second air circuit safety valve assembly; the air inlet interface assembly 1 is connected in sequence to the switch valve 2, the first air circuit safety valve assembly, the gas filter assembly 4, the pressure regulating valve 5, the sonic nozzle test tube assembly 7, the second air circuit safety valve assembly, and the air outlet interface assembly 9; the sonic nozzle test tube assembly 7 is provided with a pressure sensor 8. Preferably, the pressure sensor 8 is a digital pressure sensor.

[0077] The air inlet interface assembly 1 and the air outlet interface assembly 9 both include an interface assembly; the interface assembly includes a one-way valve 11, a quick connector 12 and a conversion connector 13, one end of the quick connector 12 is connected to one end of the one-way valve 11 and the conversion connector 13 in sequence; in the air inlet interface assembly 1, the other end of the quick connector 12 can be connected to the external air supply system, and the other end of the conversion connector 13 is connected to the switch valve 2; in the air outlet interface assembly 9, the other end of the quick connector 12 can be connected to the detection system to be tested, and the other end of the conversion connector 13 is connected to the second air circuit safety valve assembly.

[0078] Preferably, the quick connector 12 of the air inlet interface assembly 1 is connected to the external air supply system, the quick connector 12 of the air outlet interface assembly 9 is connected to the external fuel nozzle to be tested, and the adapter 13 is connected to the internal air circuit. The one-way valve 11 ensures that the internal pipeline is not contaminated when not in operation. The quick connector 12 is a connector that can connect or disconnect the pipeline without tools, including a quick male connector and a quick female connector. Whether it is connected to the external air supply system or the detection system to be tested, a quick interface is used, and the connection is fast and convenient.

[0079] The first gas circuit safety valve assembly and the second gas circuit safety valve assembly both include a three-way connector 31 and a safety valve 32; in the first gas circuit safety valve assembly, the three ends of the three-way connector 31 are respectively connected to the switch valve 2, the gas filter assembly 4, and the safety valve 32; in the second gas circuit safety valve assembly, the three ends of the three-way connector 31 are respectively connected to the sonic nozzle test tube group 7, the gas outlet interface assembly 9, and the safety valve 32.

[0080] Preferably, the gas circuit safety valve assembly 3 is composed of two groups, namely the first gas circuit safety valve assembly and the second gas circuit safety valve assembly. The first gas circuit safety valve assembly and the second gas circuit safety valve assembly are respectively arranged upstream and downstream of the sonic nozzle test tube assembly 7. Two of the three-way joints 31 are 180 degrees apart. The two interfaces of the three-way joint 31 that are 180 degrees are connected to the main gas circuit (i.e., the two interfaces of the three-way joint 31 connecting the switch valve 2 and the gas filter assembly 4 are 180 degrees in the first gas circuit safety valve assembly; the two interfaces of the three-way joint 31 connecting the sonic nozzle test tube assembly 7 and the outlet interface assembly 9 are 180 degrees in the second gas circuit safety valve assembly), and the remaining interface is connected to the safety valve 32. The set pressure of the safety valve 32 is set according to the maximum pressure allowed by the detection gas circuit. The first gas circuit safety valve assembly is located at the most upstream of the gas circuit, and is set according to the maximum pressure allowed by the gas circuit. The pressure value is relatively high, which is used to ensure the safety of all components downstream thereof. The second gas circuit safety valve assembly is located at the most downstream of the gas circuit, and the set pressure is relatively low, which is used to ensure the safety of the operator.

[0081] The gas filter assembly 4 includes a solid particle filter 41 and a liquid filter 42. One end of the solid particle filter 41 is connected to the first gas circuit safety valve assembly, the other end of the solid particle filter 41 is connected to one end of the liquid filter 42, and the other end of the liquid filter 42 is connected to the pressure regulating valve 5. The solid particle filter 41 and the liquid filter 42 are connected in series between the first gas circuit safety valve assembly and the pressure regulating valve 5 to filter out particles and moisture contained in the test gas, thereby fully ensuring the detection accuracy.

[0082] like Figure 2As shown (the arrow in the figure indicates the direction of air flow), the sonic nozzle test tube group 7 includes a rectifier 71, an air inlet straight pipe section 72, a sonic nozzle 75 and an air outlet straight pipe section 76; one end of the rectifier 71 is connected to the air inlet straight pipe section 72, the sonic nozzle 75, and one end of the air outlet straight pipe section 76 in sequence, the other end of the rectifier 71 is connected to the pressure regulating valve 5, and the other end of the air outlet straight pipe section 76 is connected to the second air path safety valve assembly. One or more equalizing rings are provided on the air inlet straight pipe section 72, and one or more equalizing rings are provided on the air outlet straight pipe section 76; a pressure sensor 8 is provided on one equalizing ring of the air inlet straight pipe section 72 and one equalizing ring of the air outlet straight pipe section 76.

[0083] Preferably, the upstream and downstream ends of the sonic nozzle test tube group 7 are connected to the gas circuit through quick connectors. The first pressure equalizing ring 73 and the second pressure equalizing ring 74 are arranged on the air inlet straight pipe section, and the third pressure equalizing ring 77 is arranged on the air outlet straight pipe section 76. The rectifier 71, the air inlet straight pipe section 72, the air outlet straight pipe section 76, the first pressure equalizing ring 73, the second pressure equalizing ring 74 and the third pressure equalizing ring 77 are all for adjusting the airflow state, playing the role of rectification and stabilization, and improving the test accuracy of gas pressure. The sonic nozzle 75 is the core test element of the whole system, which determines the accuracy of system detection and the flow range of detection.

[0084] It also includes a hose assembly 6, which includes a first hose assembly, a second hose assembly and a third hose assembly; the pressure regulating valve 5 is connected to the sonic nozzle test tube set 7 through the first hose assembly, the sonic nozzle test tube set 7 is connected to the pressure sensor 8 through the second hose assembly, and the sonic nozzle test tube set 7 is connected to the second gas circuit safety valve assembly through the third hose assembly. The first hose assembly, the second hose assembly and the third hose assembly all include a front quick connector 61, a hose 62 and a terminal quick connector 63, and the front quick connector 61 is connected to the hose 62 and the terminal quick connector 63 in sequence. Preferably, the hose 62 is a metal braided hose.

[0085] According to another aspect of the present invention, a method for screening the degree of blockage of a fuel nozzle is provided, which uses the sonic nozzle positive pressure detection pneumatic system for detection and screening, and comprises the following steps:

[0086] Step 1: Detect the positive pressure of the sonic nozzle to check whether the pneumatic system is blocked;

[0087] Step 2: Detect multiple new fuel nozzles to obtain the pressure sensor 8 readings P1 on multiple intake straight pipe sections 72. Preferably, detect 5 new fuel nozzles;

[0088] Step 3: Detect multiple old fuel nozzles; obtain the pressure sensor 8 readings P2 on multiple intake straight pipe sections 72, preferably, detect 5 old fuel nozzles;

[0089] Step 4: defining a basic reference value, a P upper limit value, and a P lower limit value according to a plurality of P1s and P2s, and screening old fuel nozzles according to the basic reference value, the P upper limit value, and the P lower limit value;

[0090] The steps 1, 2, 3 and 4 are performed in sequence, or the steps 1, 3, 2 and 4 are performed in sequence.

[0091] Preferably, P1 and P2 can reflect the gas mass flow rate through the fuel nozzle. After the multiple new fuel nozzles and the multiple old fuel nozzles are tested, the connection between the air inlet interface assembly 1 and the external air supply system is disconnected, the switch valve 2 is closed to the OFF position, and the pressure regulating valve 5 is rotated to the minimum pressure position.

[0092] The step 1 is specifically as follows:

[0093] Open the switch valve 2 and the pressure regulating valve 5 to the ON position, and observe whether the readings of the pressure sensors 8 on the air inlet straight pipe section 72 and the air outlet straight pipe section 76 are atmospheric pressure values, and whether the difference between the readings of the two pressure sensors 8 is within the set range;

[0094] If the readings of the two pressure sensors 8 are not atmospheric pressure values ​​or the difference between the readings of the two pressure sensors 8 is large and not within the set range, it is determined that the initial setting of the pressure sensor 8 is improper or the internal pipeline of the speed nozzle positive pressure detection pneumatic system is blocked. This fault needs to be eliminated until the readings of the two pressure sensors 8 are atmospheric pressure values ​​and the difference between the readings of the two pressure sensors 8 is within the set range;

[0095] If the readings of the two pressure sensors 8 are atmospheric pressure values, and the difference between the readings of the two pressure sensors 8 is within the set range, then proceed to step 2 or step 3;

[0096] The step 2 comprises the following steps:

[0097] Step 2.1: Preset the pressure value of the gas circuit safety valve assembly 3, then adjust the switch valve 2 to the OFF position, and rotate the pressure regulating valve 5 to the minimum pressure position;

[0098] Step 2.2: Connect the air inlet interface assembly 1 to the external air supply system, and connect the air outlet interface assembly 9 to the first new fuel nozzle; preferably, the external air supply system provides an air source with a pressure much higher than the atmospheric pressure, thereby ensuring the prerequisite that the sonic nozzle 75 can be adjusted to the sonic state, that is, the positive pressure method;

[0099] Step 2.3: Open the switch valve 2 to the ON position, rotate the pressure regulating valve 5 toward the maximum pressure position until the reading of the pressure sensor 8 on the outlet straight pipe section 76 reaches the set value, and read the reading P1 of the pressure sensor 8 on the inlet straight pipe section 72;

[0100] The set value is determined by the airway structure of the fuel nozzle to be tested, which is a prerequisite for ensuring that the test gas can smoothly pass through the tested object. The set values ​​of different types of tested objects are generally different; the sonic nozzle test tube group 7 matches the airway diameter of the fuel nozzle to be tested, ensuring that the sonic nozzle 75 can work in a sonic state; the sonic nozzle test tube group 7 has a sonic characteristic, that is, when it works in a sonic state, the mass flow passing through is only related to the pressure value at the entrance of the sonic nozzle, and it is a linear positive proportional relationship. The more serious the blockage of the fuel nozzle, the smaller the mass flow passing through, and the smaller the P1 value; if different types of tested objects need to be tested, it is only necessary to disconnect the hose assembly 6 upstream and downstream of the sonic nozzle test tube group 7 and replace it with a sonic nozzle test tube group 7 of another specification. The connection is fast, and a system can be used to detect multiple types of fuel nozzles;

[0101] Step 2.4: Close the switch valve 2 to the OFF position, rotate the pressure regulating valve 5 to the minimum pressure position, disconnect the gas outlet interface assembly 9 from the first new fuel nozzle, and connect the gas outlet interface assembly 9 to the second new fuel nozzle, and repeat step 2.3;

[0102] Step 2.5: Repeat step 2.4 to complete the detection of multiple new fuel nozzles and obtain multiple P1 values;

[0103] The step 3 comprises the following steps:

[0104] Step 3.1: The pressure value of the gas circuit safety valve assembly 3 is a preset value, the gas interface assembly 1 is connected to the external gas supply system, and the gas outlet interface assembly 9 is connected to the first old fuel nozzle;

[0105] Step 3.2: Open the switch valve 2 to the ON position, rotate the pressure regulating valve 5 toward the maximum pressure position until the reading of the pressure sensor 8 on the outlet straight pipe section 76 reaches the set value, and read the reading P2 of the pressure sensor 8 on the inlet straight pipe section 72;

[0106] Step 3.3: Close the switch valve 2 to the OFF position, rotate the pressure regulating valve 5 to the minimum pressure position, disconnect the gas outlet interface assembly 9 from the first old fuel nozzle, and connect the gas outlet interface assembly 9 to the second old fuel nozzle, and repeat step 3.2;

[0107] Step 3.4: Repeat step 3.3 to complete the detection of multiple old fuel nozzles and obtain multiple P2 values;

[0108] The step 4 comprises the following steps:

[0109] Step 4.1: Take the average of multiple P1 values ​​and record it as P 标准值 , P 标准值 ×0.9 as the basic reference value; take the average of multiple P2 values ​​and record it as P2 平均值 ; P2平均值 ×(1+2%) as P 上限值 , P2 平均值 ×(1-2%) as P 下限值 ; According to the basic reference value, P 上限值 and P 下限值 Screening of old fuel nozzles;

[0110] Step 4.2: Compare the P2 value of the old fuel nozzle with the basic reference value. If the P2 value is less than the basic reference value, the old fuel nozzle is unqualified; if the P2 value is greater than or equal to the basic reference value, execute step 4.3;

[0111] Step 4.3: Compare the P2 value with P 上限值 and P 下限值 Compare; if P 上限值 ≥P2≥P 下限值 , then the old fuel nozzle is qualified; if P2<P 下限值 Or P2>P 上限值 , then the old fuel nozzle is unqualified. Among them, qualified means usable, and unqualified means unusable.

[0112] like Figure 3 As shown, the P2 value, basic reference value, P 上限值 and P 下限值 Draw on the chart, and filter the fuel nozzles by looking at the chart. If P2 is greater than or equal to the basic reference value and P 上限值 and P 下限值 If it is within the formed bandwidth, it is qualified (available), otherwise it is unqualified (unavailable). Figure 3 The fuel nozzles numbered 1, 19, 25 and 27 were clogged beyond the standard and were deemed unqualified.

[0113] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A method for screening the degree of blockage of a fuel nozzle, characterized in that: The steps include: Step 1: Detect the positive pressure of the sonic nozzle to check whether the pneumatic system is blocked; Step 2: Detect multiple new fuel nozzles to obtain pressure sensor (8) readings P1 on multiple intake straight pipe sections (72); Step 3: Detect multiple old fuel nozzles; obtain the pressure sensor (8) readings P2 on multiple intake straight pipe sections (72); Step 4: Define basic reference values ​​and P based on multiple P1 and P2 上限值 and P 下限值 , and according to the basic reference value, P 上限值 and P 下限值 Screening of old fuel nozzles; Step 1, step 2, step 3, and step 4 are performed in sequence, or step 1, step 3, step 2, and step 4 are performed in sequence; The step 1 is specifically as follows: Open the switch valve (2) and the pressure regulating valve (5) to the ON position, and observe whether the readings of the pressure sensors (8) on the air inlet straight pipe section (72) and the air outlet straight pipe section (76) are atmospheric pressure values, and whether the difference between the readings of the two pressure sensors (8) is within the set range; If the readings of the two pressure sensors (8) are not atmospheric pressure values ​​or the difference between the readings of the two pressure sensors (8) is large and is not within the set range, it is determined that the initial setting of the pressure sensor (8) is improper or the internal pipeline of the sonic nozzle positive pressure detection pneumatic system is blocked, and the fault needs to be eliminated until the readings of the two pressure sensors (8) are atmospheric pressure values ​​and the difference between the readings of the two pressure sensors (8) is within the set range; If the readings of the two pressure sensors (8) are atmospheric pressure values, and the difference between the readings of the two pressure sensors (8) is within the set range, proceed to step 2 or step 3; The step 2 comprises the following steps: Step 2.1: Preset the pressure value of the gas line safety valve assembly (3), then adjust the switch valve (2) to the OFF position, and rotate the pressure regulating valve (5) to the minimum pressure position; Step 2.2: Connect the air inlet interface assembly (1) to the external air supply system, and connect the air outlet interface assembly (9) to the first new fuel nozzle; Step 2.3: Open the switch valve (2) to the ON position, rotate the pressure regulating valve (5) toward the maximum pressure position until the reading of the pressure sensor (8) on the outlet straight pipe section (76) reaches the set value, and read the reading P1 of the pressure sensor (8) on the inlet straight pipe section (72); Step 2.4: Close the switch valve (2) to the OFF position, rotate the pressure regulating valve (5) to the minimum pressure position, disconnect the air outlet interface assembly (9) from the first new fuel nozzle, and connect the air outlet interface assembly (9) to the second new fuel nozzle, and repeat step 2.3; Step 2.5: Repeat step 2.4 to complete the detection of multiple new fuel nozzles and obtain multiple P1 values; The step 3 comprises the following steps: Step 3.1: The pressure value of the gas circuit safety valve assembly (3) is a preset value, the gas interface assembly (1) is connected to the external gas supply system, and the gas outlet interface assembly (9) is connected to the first old fuel nozzle; Step 3.2: Open the switch valve (2) to the ON position, rotate the pressure regulating valve (5) toward the maximum pressure position until the reading of the pressure sensor (8) on the outlet straight pipe section (76) reaches the set value, and read the reading P2 of the pressure sensor (8) on the inlet straight pipe section (72); Step 3.3: Close the switch valve (2) to the OFF position, rotate the pressure regulating valve (5) to the minimum pressure position, disconnect the air outlet interface assembly (9) from the first old fuel nozzle, and connect the air outlet interface assembly (9) to the second old fuel nozzle, and repeat step 3.2; Step 3.4: Repeat step 3.3 to complete the detection of multiple old fuel nozzles and obtain multiple P2 values; The step 4 comprises the following steps: Step 4.1: Take the average of multiple P1 values ​​and record it as P 标准值 , P 标准值 ×0.9 as the basic reference value; take the average of multiple P2 values ​​and record it as P2 平均值 ; P2 平均值 × (1 + 2%) as P 上限值 , P2 平均值 × (1-2%) as P 下限值 ; According to the basic reference value, P 上限值 and P 下限值 Screening of old fuel nozzles; Step 4.2: Compare the P2 value of the old fuel nozzle with the basic reference value. If the P2 value is less than the basic reference value, the old fuel nozzle is unqualified; if the P2 value is greater than or equal to the basic reference value, execute step 4.3; Step 4.3: Compare the P2 value with P 上限值 and P 下限值 Compare; if P 上限值 ≥P2≥P 下限值 , then the old fuel nozzle is qualified; If P2<P 下限值 Or P2>P 上限值 , then the old fuel nozzle is unqualified.

2. A sonic nozzle positive pressure detection pneumatic system, characterized in that: The method for screening the degree of fuel nozzle blockage according to claim 1 comprises an air inlet interface component (1), an on-off valve (2), an air path safety valve component (3), a gas filter component (4), a pressure regulating valve (5), a sonic nozzle test tube group (7), a pressure sensor (8) and an air outlet interface component (9); The gas circuit safety valve assembly (3) comprises a first gas circuit safety valve assembly and a second gas circuit safety valve assembly; The air inlet interface assembly (1) is sequentially connected to the switch valve (2), the first air path safety valve assembly, the gas filter assembly (4), the pressure regulating valve (5), the sonic nozzle test tube assembly (7), the second air path safety valve assembly, and the air outlet interface assembly (9); The sonic nozzle test tube assembly (7) is provided with a pressure sensor (8).

3. The sonic nozzle positive pressure detection pneumatic system according to claim 2, characterized in that: The air inlet interface assembly (1) and the air outlet interface assembly (9) both comprise an interface assembly; The interface assembly comprises a one-way valve (11), a quick connector (12) and a conversion connector (13), wherein one end of the quick connector (12) is connected to one end of the one-way valve (11) and one end of the conversion connector (13) in sequence; In the air inlet interface assembly (1), the other end of the quick connector (12) can be connected to an external air supply system, and the other end of the conversion connector (13) is connected to the switch valve (2); In the air outlet interface assembly (9), the other end of the quick connector (12) can be connected to the detection system to be tested, and the other end of the conversion connector (13) is connected to the second air path safety valve assembly.

4. The sonic nozzle positive pressure detection pneumatic system according to claim 2, characterized in that: The first gas circuit safety valve assembly and the second gas circuit safety valve assembly both comprise a three-way connector (31) and a safety valve (32); In the first gas path safety valve assembly, the three ends of the three-way connector (31) are respectively connected to the switch valve (2), the gas filter assembly (4), and the safety valve (32); In the second gas path safety valve assembly, three ends of the three-way connector (31) are respectively connected to the sonic nozzle test tube assembly (7), the gas outlet interface assembly (9), and the safety valve (32).

5. The sonic nozzle positive pressure detection pneumatic system according to claim 2, characterized in that: The gas filter assembly (4) comprises a solid particle filter (41) and a liquid filter (42); one end of the solid particle filter (41) is connected to a first gas path safety valve assembly; the other end of the solid particle filter (41) is connected to one end of the liquid filter (42); and the other end of the liquid filter (42) is connected to a pressure regulating valve (5).

6. The sonic nozzle positive pressure detection pneumatic system according to claim 2, characterized in that: The sonic nozzle test tube assembly (7) comprises a rectifier (71), an air inlet straight pipe section (72), a sonic nozzle (75) and an air outlet straight pipe section (76); One end of the rectifier (71) is connected in sequence to an air inlet straight pipe section (72), a sonic nozzle (75), and one end of an air outlet straight pipe section (76); the other end of the rectifier (71) is connected to a pressure regulating valve (5); and the other end of the air outlet straight pipe section (76) is connected to a second air path safety valve assembly.

7. The sonic nozzle positive pressure detection pneumatic system according to claim 6, characterized in that: One or more pressure equalizing rings are provided on the air inlet straight pipe section (72), and one or more pressure equalizing rings are provided on the air outlet straight pipe section (76); A pressure sensor (8) is provided on a pressure equalizing ring of the air inlet straight pipe section (72) and a pressure equalizing ring of the air outlet straight pipe section (76).

8. The sonic nozzle positive pressure detection pneumatic system according to claim 2, characterized in that: Also included is a hose assembly (6), the hose assembly (6) comprising a first hose assembly, a second hose assembly and a third hose assembly; The pressure regulating valve (5) is connected to the sonic nozzle test tube assembly (7) via a first hose assembly, the sonic nozzle test tube assembly (7) is connected to the pressure sensor (8) via a second hose assembly, and the sonic nozzle test tube assembly (7) is connected to the second gas path safety valve assembly via a third hose assembly.

9. The sonic nozzle positive pressure detection pneumatic system according to claim 8, characterized in that: The first hose assembly, the second hose assembly and the third hose assembly all comprise a front quick connector (61), a hose (62) and a terminal quick connector (63), wherein the front quick connector (61) is connected to the hose (62) and the terminal quick connector (63) in sequence.

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