A method and device for testing the ignition voltage of an ignition probe of an aeroengine

Abstract

The present application relates to the technical field of ignition electrode test, and discloses a method and device for testing the ignition voltage of an aero-engine ignition electrode, comprising allowing fuel to drop in drops on the discharge end of the ignition electrode under test; and obtaining the minimum ignition voltage of the ignition electrode under test by gradually increasing the ignition voltage in steps.The present application simulates the extreme situation in which fuel in the combustion chamber of an engine coagulates into drops, which are sprinkled and soak the discharge end of the ignition electrode, and tests the actual ignition voltage of the ignition electrode when it is assembled on an engine, so that the test result is more accurate and has higher reliability than the ignition voltage test of the ignition electrode of a previous aero-engine; and the test can be performed on ignition electrodes of different specifications and under different working conditions by setting the mounting seat, clamping assembly, supporting assembly and oil dripping assembly, so that the application range is wide; and the ignition electrode test scene is stabilized, so that the reliability of the test data is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ignition electrode testing, in particular to a method and device for testing the ignition voltage of an ignition electrode of an aero-engine. BACKGROUND

[0002] Ignition electrodes are installed in the combustion chamber of an engine to convert high-voltage pulses transmitted from the outside into electric sparks to ignite the fuel in the combustion chamber. If the ignition voltage of an ignition electrode is too high or too low, the ignition electrode will not ignite, which will result in the failure of the engine to start. Therefore, the minimum ignition voltage of an ignition electrode is an important indicator of the ignition electrode, and must be tested.

[0003] Conventional ignition voltage tests of ignition electrodes only test the ignition voltage in a laboratory environment. However, the fuel in the combustion chamber is normally in an atomized state, and in extreme cases, it can condense into oil droplets. Therefore, there is a large difference between the test environment in the laboratory and the actual environment in the combustion chamber of an engine. This can cause the tested ignition voltage to be inconsistent with the actual working ignition voltage, which will result in the failure of the ignition electrode to ignite when it is actually used. SUMMARY

[0004] The purpose of the present application is to provide a method and device for testing the ignition voltage of an ignition electrode of an aero-engine, which solves the problem that the ignition data tested by the existing test method is inconsistent with the ignition data required by the actual environment in the combustion chamber of an engine.

[0005] The present application is implemented by the following technical solution: a method for testing the ignition voltage of an ignition electrode of an aero-engine, in which fuel is dropped in drops on the discharge end of the ignition electrode being tested; the minimum ignition voltage of the ignition electrode being tested is obtained by gradually increasing the ignition voltage in steps; the initial voltage is V i , the ignition voltage is V i+n , and V i+n =V i +N*V step , where V step is the step size, and N is the number of times the voltage is increased.

[0006] In order to better implement the present application, further, the specific steps of the test are as follows:

[0007] Step S1: Before the fuel is dropped, the ignition electrode being tested is installed on the oil dropping device by a clamp;

[0008] Step S2: The ignition electrode being tested is connected to a voltage-adjustable power supply;

[0009] Step S3: The oil dropping device is operated to cause the fuel to drop on the discharge end of the ignition electrode being tested;

[0010] Step S4: The initial voltage Vi , to observe whether the ignition is successful or not;

[0011] Step S5, increase the power supply output voltage to V i+1 , to observe whether the ignition is successful or not;

[0012] Step S6, repeat step S5 until the ignition of the tested ignition electrode is observed to be successful, at this time, the voltage V i+n output by the power supply is the ignition voltage.

[0013] In order to better realize the present application, further, in the step S3, before the oil is actually dropped to the discharge end of the tested ignition electrode, the dropping speed and the dropping diameter are adjusted according to the experimental conditions required.

[0014] A device for testing the ignition voltage of an ignition electrode of an aero-engine, comprising a mounting seat, a slide rod, an oil dropping assembly, a clamping assembly and a plurality of support assemblies, the oil dropping assembly comprising an oil cup and an oil dropping nozzle in communication with the oil cup; the slide rod is mounted on the mounting seat, the support assemblies are movably connected to the slide rod, the top support assembly is used for placing the oil dropping assembly, the middle support assembly is used for controlling the oil dropping nozzle, and the bottom support assembly is used for placing the clamping assembly.

[0015] In order to better realize the present application, further, the support assembly comprises a fixing screw, a slide sleeve, a support plate, and a connecting plate, the fixing screw is threadedly connected with the slide sleeve, the slide sleeve is slidably connected to the slide rod, and the connecting plate is fixedly connected with the slide sleeve through the support plate; the connecting plate in the top support assembly is a support plate B, the connecting plate in the middle support assembly is a support plate A, and the connecting plate in the bottom support assembly is a fixing plate; the oil cup is mounted on the support plate B, the oil dropping nozzle is mounted on the support plate A, and the clamping assembly is mounted on the fixing plate.

[0016] In order to better realize the present application, further, the oil dropping assembly further comprises a joint A, an electric regulating valve, and a joint B, the oil cup comprises a cover and a cup body, the cup body is in communication with the electric regulating valve through the joint A, and the oil dropping nozzle is in communication with the electric regulating valve through the joint B.

[0017] In order to better realize the present application, further, the clamping assembly comprises a product clamp, a pin, a movable bolt, a knurled nut, a ring, and a sealing rubber ring, the product clamp is provided with the sealing rubber ring at the bottom, a plurality of pins are mounted on the wall surface of the product clamp, and the ring is sleeved into the product clamp from the bottom; a plurality of movable bolts are slidably connected to the fixing plate, and the knurled nut is threadedly connected to the movable bolt.

[0018] In order to better realize the present application, further, the mounting seat comprises a base, a nut, a spring washer, a flat washer, a hexagonal bolt, the sliding rod is installed on the base, a plurality of hexagonal bolts are installed on the base, the flat washer and the spring washer are sleeved on the fixed plate, and the nut is threadedly connected on the hexagonal bolt.

[0019] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0020] (1) The present application simulates the extreme situation that the fuel in the engine combustion chamber condenses into oil droplets, drops and soaks the discharge end of the ignition electrode, to the greatest extent simulates the engine combustion chamber environment, tests the actual ignition voltage of the ignition electrode assembled on the engine, and the test result is more accurate and has higher feasibility than the previous aero-engine electrode ignition voltage test.

[0021] (2) The present application can avoid applying too high voltage to the ignition electrode by increasing the ignition voltage in a step-by-step manner, and reduce the damage risk.

[0022] (3) The present application can test ignition electrodes of different specifications and under different working conditions by setting the mounting seat, the clamping assembly, the supporting assembly and the oil dripping assembly, and has a wide application range; at the same time, the ignition electrode experimental scene is stable, and the reliability of the test data is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a test method flow diagram.

[0024] Figure 2 It is a schematic diagram of the overall structure of the test device.

[0025] Figure 3 It is a schematic diagram of the mounting seat structure.

[0026] Among them: 101-base; 102-sliding rod; 103-fixed screw; 104-fixed plate; 105-sliding sleeve; 106-supporting plate A; 107-branch plate; 108-supporting plate B; 109-lid; 110-cup body; 111-joint A; 112-electric regulating valve; 113-joint B; 114-oil dripping nozzle; 115-product clamp; 116-pinhole; 117-loose bolt; 118-knob nut; 119-annular ring; 120-sealing rubber ring; 121-nut; 122-spring washer; 123-flat washer; 124-hexagonal bolt. DETAILED DESCRIPTION

[0027] With reference to the accompanying drawings: obvious, the described embodiments are only a part of the embodiments of the present application, rather than all. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of the present application.

[0028] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] Embodiment 1:

[0030] The embodiment provides a method for testing the ignition voltage of an ignition electrode of an aero-engine, specifically as shown in Figure 1 , the fuel is dropped in drops on the discharge end of the measured ignition electrode; the minimum ignition voltage of the measured ignition electrode is obtained by increasing the ignition voltage step by step.

[0031] The initial voltage is V i , the ignition voltage is V i+n , and V i+n =V i +N*V step , wherein V step is the step size, i.e. the voltage size increased each time, and N is the number of times the voltage is increased.

[0032] Through the drop oil ignition voltage test, the extreme case of the engine combustion chamber fuel condensing into oil drops is simulated, at this time the fuel drops are scattered and soaked in the discharge end of the ignition electrode, the ignition voltage of the ignition electrode is tested, the extreme environment of the engine combustion chamber is simulated to the greatest extent, the actual ignition voltage of the ignition electrode assembled in the engine is tested, and the test result is more accurate than the previous aero-engine electrode ignition voltage test, and the test result is more accurate. The step-by-step increase in ignition voltage can avoid applying too high a voltage to the ignition electrode and reduce the risk of damage.

[0033] Embodiment 2:

[0034] The embodiment further extends the test steps based on embodiment 1, specifically as shown in Figure 1 , the specific steps of the test are:

[0035] Step S1, before dropping fuel, the measured ignition electrode is installed on the oil dropping device by a clamp;

[0036] Step S2, the measured ignition electrode is connected to a voltage adjustable power supply;

[0037] Step S3, the oil dropping device is operated to make fuel drop on the discharge end of the measured ignition electrode;

[0038] Step S4, an initial voltage V i is set for the power supply to supply power to the measured ignition electrode, and whether ignition is successful is observed;

[0039] Step S5, the output voltage of the power supply is increased to V i+1 , and whether ignition is successful is observed;

[0040] Step S6, step S5 is repeated until it is observed that the measured ignition electrode ignites successfully, at this time, the voltage V i+n output by the power supply is the ignition voltage.

[0041] The purpose of using the clamp is to stably place the ignition electrode, and to place the ignition electrode in the experimental process to avoid shaking and thus affecting the experimental data; the oil dropping device can uniformly drop fuel, and also to improve the reliability of the experimental data.

[0042] The other parts of this embodiment are the same as those of the above embodiment, and will not be described again.

[0043] Embodiment 3

[0044] This embodiment further extends the test steps on the basis of embodiment 2, and specifically as shown in the step S3, before formally dropping oil to the discharge end of the measured ignition electrode, the oil dropping speed and the oil dropping diameter are adjusted according to the experimental conditions required. The oil dropping speed is 10 drops to 100 drops / min; the oil drop ball diameter is Φ2mm to Φ5mm. Figure 1 Before the experiment, debugging preparation work is performed according to the experimental conditions, so that different ignition voltages of the ignition electrode are tested under different specifications of fuel injection and different fuel injection speed conditions, and the test range is more extensive.

[0045] The other parts of this embodiment are the same as those of the above embodiment, and will not be described again.

[0046] Embodiment 4

[0047] This embodiment provides a device for testing the ignition voltage of an ignition electrode of an aero-engine, and specifically as shown in

[0048] , Figure 2 Figure 3 ​As shown, it comprises a mounting base, a slide rod 102, an oil dripping assembly, a clamping assembly and a plurality of support assemblies, the oil dripping assembly comprises an oil cup and an oil dripping nozzle 114 in communication with the oil cup.

[0049] The slide rod 102 is mounted on the mounting base, and the support assemblies are movably connected to the slide rod 102, the top support assembly is used for placing the oil dripping assembly, the middle support assembly is used for controlling the oil dripping nozzle 114, and the bottom support assembly is used for placing the clamping assembly.

[0050] Before the oil dripping ignition voltage test is performed, the spacing of the support assemblies on the slide rod 102 is adjusted according to the specification of the ignition electrode, then the ignition electrode is fixed by the clamping assembly, and then the oil dripping assembly is started to make the oil dripping nozzle 114 drip oil at a constant speed on the discharge end of the ignition electrode, and the test is started.

[0051] The other parts of the embodiment are the same as those of the above-described embodiments, and will not be described again.

[0052] Embodiment 5

[0053] The support assembly is further expanded on the basis of Embodiment 4, and specifically as shown in Figure 2 The support assembly comprises a fixing screw 103, a sliding sleeve 105, a support plate 107, and a connecting plate, the fixing screw 103 is threadedly connected with the sliding sleeve 105, the sliding sleeve 105 is slidably connected to the slide rod 102, and the connecting plate is fixedly connected with the sliding sleeve 105 through the support plate 107; the connecting plate in the top support assembly is a support plate B 108, the connecting plate in the middle support assembly is a support plate A 106, and the connecting plate in the bottom support assembly is a fixing plate 104; the oil cup is mounted on the support plate B 108, the oil dripping nozzle 114 is mounted on the support plate A 106, and the clamping assembly is mounted on the fixing plate 104.

[0054] When the position of the support assembly is adjusted, the fixing screw 103 is loosened first, at this time the sliding sleeve 105 is manually slid on the slide rod 102, after the position is adjusted, the fixing screw 103 is tightened, at this time the position of the sliding sleeve 105 is fixed; the adjustment is convenient and the operation is simple.

[0055] The other parts of the embodiment are the same as those of the above-described embodiments, and will not be described again.

[0056] Embodiment 6

[0057] The oil dripping assembly is further expanded on the basis of Embodiment 5, and specifically as shown in Figure 2As shown, the oil dripping assembly also includes connector A111, electric regulating valve 112, and connector B113. The oil cup includes a cover 109 and a cup body 110. The cup body 110 is connected to the electric regulating valve 112 through connector A111, and the oil dripping nozzle 114 is connected to the electric regulating valve 112 through connector B113.

[0058] The opening degree and cross-sectional area of ​​the electric regulating valve 112 are controlled by connecting an electrical interface and a program to achieve the purpose of regulating the flow of the electric regulating valve 112.

[0059] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0060] Example 7:

[0061] This embodiment further expands the clamping component based on embodiment 5, specifically as follows: Figure 2 As shown, the clamping assembly includes a product clamp 115, pins 116, movable bolts 117, knurled nuts 118, retaining rings 119, and sealing rings 120. A sealing ring 120 is installed at the bottom of the product clamp 115, and multiple pins 116 are installed on the wall of the product clamp 115. The retaining rings 119 are inserted from the bottom of the product clamp 115. Multiple movable bolts 117 are slidably connected on the fixing plate 104, and knurled nuts 118 are threaded onto the movable bolts 117.

[0062] When installing the ignition nozzle, first rotate the knurled nut 118 to move the movable bolt 117 radially along the fixed plate 104. Then, place the retaining ring 119 flat on the multiple movable bolts 117. Next, insert the product fixture 115 with the pin 116 installed into the center of the retaining ring 119. Due to the limiting effect of the pin 116 and the movable bolt 117 on the retaining ring 119, the product fixture 115 is stably supported, and the ignition nozzle is installed in the product fixture 115. During the experiment, the oil droplets that drip are collected by the product fixture 115 to prevent oil from contaminating the workbench.

[0063] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0064] Example 8:

[0065] This embodiment further expands upon the mounting base based on embodiment 4, specifically as follows: Figure 3 As shown, the mounting base includes a base 101, a nut 121, a spring washer 122, a flat washer 123, and a hexagonal bolt 124. The slide rod 102 is mounted on the base 101, and a plurality of hexagonal bolts 124 are mounted on the base 101. The flat washer 123 and the spring washer 122 are sleeved on the fixing plate 104, and the nut 121 is threadedly connected to the hexagonal bolt 124.

[0066] In the installation of the device, first unscrew the nut 121, then pass the hexagonal bolt 124 through the workbench, at this time the spring washer 122 between the workbench and the base 101 begins to be compressed, then screw the nut 121 on the hexagonal bolt 124, by tightening the different flat washers 123 to different degrees, to adjust the inclination angle of the base 101, that is, to adjust so that the product clamp 115 is coaxial and vertical with the oil nozzle 114. Prevent the oil droplet position deviation at the oil nozzle 114 caused by the non-horizontal workbench.

[0067] Other parts of the embodiment are the same as the above-described embodiments and will not be described again.

[0068] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification or equivalent change made according to the technical essence of the present application to the above embodiments falls within the protection scope of the present application.

Claims

1. A device for testing the ignition voltage of an ignition electrode in an aircraft engine, characterized in that: It includes a mounting base, a slide bar (102), an oil dripping assembly, a clamping assembly, and multiple support assemblies. The oil dripping assembly includes an oil cup and an oil dripping nozzle (114) connected thereto. The slide bar (102) is mounted on the mounting base, and the support assembly is movably connected to the slide bar (102). The top support assembly is used to place the oil dripping assembly, the middle support assembly is used to control the oil dripping nozzle (114), and the bottom support assembly is used to place the clamping assembly. The support assembly includes a fixing screw (103), a sliding sleeve (105), a support plate (107), and a connecting plate. The fixing screw (103) is threadedly connected to the sliding sleeve (105), and the sliding sleeve (105) is slidably connected to the sliding rod (102). The connecting plate is fixedly connected to the sliding sleeve (105) through the support plate (107). In the top support assembly, the connecting plate is support plate B (108), in the middle support assembly, the connecting plate is support plate A (106), and in the bottom support assembly, the connecting plate is a fixing plate (104). The oil cup is installed on the support plate B (108), the oil drip nozzle (114) is installed on the support plate A (106), and the clamping assembly is installed on the fixing plate (104). The oil dripping assembly also includes connector A (111), electric regulating valve (112), and connector B (113). The oil cup includes a lid (109) and a cup body (110). The cup body (110) is connected to the electric regulating valve (112) through connector A (111), and the oil dripping nozzle (114) is connected to the electric regulating valve (112) through connector B (113). The clamping assembly includes a product clamp (115), pins (116), movable bolts (117), knurled nuts (118), retaining rings (119), and sealing rings (120). A sealing ring (120) is installed at the bottom of the product clamp (115), and multiple pins (116) are installed on the wall of the product clamp (115). The retaining rings (119) are inserted from the bottom of the product clamp (115). Multiple movable bolts (117) are slidably connected on the fixing plate (104), and knurled nuts (118) are threaded onto the movable bolts (117). The mounting base includes a base (101), a nut (121), a spring washer (122), a flat washer (123), and a hexagonal bolt (124). The slide rod (102) is mounted on the base (101). Multiple hexagonal bolts (124) are mounted on the base (101). The flat washer (123) and spring washer (122) are fitted on the fixing plate (104). The nut (121) is threaded onto the hexagonal bolt (124).

2. A method for testing the ignition voltage of an ignition electrode in an aircraft engine, using the apparatus of claim 1, characterized in that: The fuel is dripped onto the discharge end of the ignition nozzle being tested, in drops. The minimum ignition voltage of the tested ignition nozzle is obtained by gradually increasing the ignition voltage. The initial voltage is Vi, and the ignition voltage is Vi+n, where Vi+n = Vi + N * Vstep, and Vstep is the step size, and N is the number of times the voltage is increased.

3. The method for testing the ignition voltage of an ignition nozzle for an aero-engine according to claim 2, characterized in that: The specific steps of the test are as follows: Step S1: Before dripping fuel, the ignition nozzle to be tested needs to be installed on the fuel dripping device using a clamp; Step S2: Connect the ignition nozzle under test to an adjustable power supply; Step S3: Operate the fuel dripping device so that fuel drips onto the discharge end of the ignition nozzle being tested; Step S4: Set the initial power output voltage Vi to supply power to the ignition nozzle under test, and observe whether ignition is successful. Step S5: Increase the power supply output voltage to Vi+1 and observe whether ignition is successful; Step S6: Repeat step S5 until the tested ignition nozzle is observed to ignite successfully. At this point, the voltage Vi+n output by the power supply is the ignition voltage.

4. The method for testing the ignition voltage of an ignition nozzle for an aero-engine according to claim 3, characterized in that: In step S3, before officially dripping oil onto the discharge end of the ignition nozzle under test, the dripping speed and dripping diameter are adjusted according to the experimental conditions.

Images