CN113904217B - Needle-shaped tripolar discharger for aviation magneto test - Google Patents
Needle-shaped tripolar discharger for aviation magneto test Download PDFInfo
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- CN113904217B CN113904217B CN202111097992.0A CN202111097992A CN113904217B CN 113904217 B CN113904217 B CN 113904217B CN 202111097992 A CN202111097992 A CN 202111097992A CN 113904217 B CN113904217 B CN 113904217B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T2/00—Spark gaps comprising auxiliary triggering means
- H01T2/02—Spark gaps comprising auxiliary triggering means comprising a trigger electrode or an auxiliary spark gap
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/20—Means for starting arc or facilitating ignition of spark gap
- H01T1/22—Means for starting arc or facilitating ignition of spark gap by the shape or the composition of the electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/24—Selection of materials for electrodes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
- Spark Plugs (AREA)
Abstract
The invention belongs to the field of magneto spark continuity testing for piston type aero-engines, and relates to a needle-shaped tripolar discharger for an aero-motor test. The discharger includes: the three electrodes are respectively a first electrode, a second electrode and a third electrode, the electrodes are fixed on the electrode holder, wherein the first electrode and the second electrode are fixed on the support, meanwhile, the three electrodes are used for preventing other breakdown voltage interference from being generated between the three electrodes, the first electrode and the second electrode are fixed on the base through the support, the third electrode is fixed on the base through the electrode holder, and the third electrode is positioned below the tip end of the second electrode; the first electrode is grounded through a high-voltage lead, the second electrode is connected to a high-voltage lead led out by a magnetor to be measured, and the third electrode is an auxiliary electrode and is completely insulated.
Description
Technical Field
The invention belongs to the field of magneto spark continuity testing for piston type aero-engines, and relates to a needle-shaped tripolar discharger for an aero-motor test.
Background
The magneto for the piston type aeroengine requires to test the continuity of electric sparks according to the technical requirement of 'uninterrupted electric sparks' in the test process, and simultaneously tests that 'secondary voltage of the magneto is released normally', and how to really judge whether the secondary voltage generated by the magneto meets the requirement, and whether the released electric sparks are continuous and uninterrupted is checked, wherein the two phenomena need to be really reflected and repeated considered by a three-pole discharger, which is an effective method for checking the performance of the magneto and judging the secondary voltage.
Disclosure of Invention
The purpose of the invention is as follows: the discharge condition of the magneto in the engine is simulated really, high-voltage discharge generated by secondary voltage of the magneto can be checked by means of the simulated structure, whether the discharge energy meets the standard or not is checked by means of whether breakdown and ionization of air, whether electric sparks are continuous or not is fed back by means of visual and auditory observation, and the secondary voltage of the magneto at different rotating speeds is judged by means of the spark discharge state.
The technical scheme is as follows:
a needle-like tripolar discharger for testing an aviation magneto, comprising: the three electrodes are respectively a first electrode, a second electrode and a third electrode, the electrodes are fixed on the electrode holder, wherein the first electrode and the second electrode are fixed on the support, meanwhile, the three electrodes are used for preventing other breakdown voltage interference from being generated between the three electrodes, the first electrode and the second electrode are fixed on the base through the support, the third electrode is fixed on the base through the electrode holder, and the third electrode is positioned below the tip end of the second electrode; the first electrode is grounded through a high-voltage lead, the second electrode is connected to a high-voltage lead led out by a magnetor to be measured, and the third electrode is an auxiliary electrode and is completely insulated;
the first electrode and the second electrode are working electrodes which are respectively a positive electrode and a negative electrode of a loop, the central lines of the two working electrodes are positioned on the same straight line, and the electrodes are inserted into the upright post holes of the electrode holder; the first and second electrode tip angles a1 and a2, the relative distance L1 and the self control distances L4 and L5 are used for controlling the state of electric sparks; the relative distance L1 is used to control the overall breakdown voltage; the third electrode is an auxiliary electrode and is not connected to a circuit formed by the first electrode and the second electrode, and the gap size L3, the self angle a3 and the distance L2 between the tips of the two electrodes of the third electrode and the second electrode are used for effectively reducing the breakdown voltage and maintaining the stability of the spark.
The electrode is in a needle-like structure, the tip of the electrode is made of nickel wire, nickel-chromium wire or nickel-manganese wire, the electrode part connected with the electrode holder is made of brass or zirconium-copper, the support is made of aluminum brass, and the base is an insulating pad.
The insulation resistance between the working electrode and the auxiliary electrode is more than 10 megaohms.
The angles of a1 and a2 are 30-32 degrees, the lengths of L4 and L5 are 15mm, and the length of L1 is 5-7 mm. The diameter of the first and second electrode cylinders is 2.5mm. The distance between the central line of the first electrode and the central line of the second electrode and the plane of the support is not less than 25mm. The central lines of the first and second electrodes should be staggered by no more than 0.5mm.
The angle of a3 is 30-32 degrees, the L3 is 0.05-0.1 mm, and the L2 is 2.3mm. The diameter of the third electrode cylinder position is 2.5mm.
The third electrode plays the following roles in the discharge process: the first and second electrodes generate discharge voltage V2 when discharging, because of the third electrode, when the voltage between the first and second electrodes rises, because of the electrostatic induction between the second and third electrodes, the potential difference is generated between the third electrode tip and the second electrode, under the action of the potential difference, the gas between the second and third electrodes is firstly ionized, and a small spark is firstly formed, and the small spark, the ultraviolet ray of the small spark and the gas ion formed when the small spark jumps, so as to promote the gas between the first and second electrodes to generate ionization. Therefore, the third electrode can perform the pre-ionization function on the gas of the first electrode and the gas of the second electrode, so that the breakdown voltage required for the first breakdown of the gas is reduced, and the voltage measured by the third electrode discharger is stable and accurate.
Further comprising: the three-pole discharger is additionally provided with a gelatin glass windshield to prevent the influence of wind and air flow on the effect of the three-pole discharger in the external environment such as an airport and the like.
The third electrode and the base can be connected by screw threads, so that the height can be conveniently adjusted.
Has the beneficial effects that: the invention can effectively complete the test of the magneto electric spark performance and the secondary voltage test, and can intuitively judge whether the electric spark is interrupted or not, thereby providing a solution for simulating the electric spark generated by the magneto for the piston type aeroengine.
Drawings
Fig. 1 is a schematic structural diagram of a three-pole arrester, in which a member 1, a member 2, and a member 3 are a first electrode, a second electrode, and a third electrode, respectively, a member 4 is a base for insulation, a member 5 is a bracket, and a member 6 is an electrode holder. The electrode welding is on the electrode holder, and the electrode holder of first, second electrode is fixed on the support through the mode of locking, and the support is fixed on the base again, and the electrode holder of third electrode is direct through threaded connection on the base, needs to guarantee each connection fastening.
Fig. 2 shows a schematic size diagram of a three-pin discharger, in which the adjustment of each size affects the discharge state. The breakdown size is determined by adjusting various parameters. In the using process, angles a1, a2, a3, L1, L2, L3, L4, L5 and L6 all change along with discharge ablation, and the angles need to be adjusted by using distance measurement according to the requirements of a magnetor.
Fig. 3 shows a schematic diagram of a three-pole discharger connected to a magneto, where the first electrode is a ground electrode, the second electrode is connected to the output end of a high-voltage cable of the magneto, and the third electrode is an auxiliary electrode.
Detailed Description
The three-pole discharger is used for checking whether the secondary voltage generated by the magneto meets the requirements or not, whether sparks between electrodes are continuous or not and whether the sparks are interrupted or not, and comprises three electrodes which are a first electrode, a second electrode and a third electrode respectively, the electrodes are welded on an electrode base, one electrode and the second electrode are fixed on a support, meanwhile, the three electrodes are used for preventing other breakdown voltage interference generated between the electrodes, the first electrode and the second electrode pass through the support, and the third electrode is fixed on a base through the electrode base.
The first electrode and the second electrode are working electrodes which are respectively a positive electrode and a negative electrode of a loop, the central lines of the two working electrodes are staggered to control a size range to be kept on the same straight line as much as possible, the electrodes are inserted into the holes of the upright posts and can freely adjust a gap L1 between the two electrodes, the electrodes and the upright posts can be locked by fastening screws, and the tip angles a1 and a2 of the first electrode and the second electrode, the relative distance L1 and the self control distances L4 and L5 are variables mainly influencing the state of electric sparks. The third electrode is an auxiliary electrode and is not connected to a circuit formed by the first electrode and the second electrode, the influence on electric sparks is controlled by controlling the gap size L3 of the third electrode and the second electrode, the angle a3 of the third electrode and the distance L2 between the tips of the two electrodes, the third electrode and the insulating plate can be in threaded connection, the height of the third electrode is convenient to adjust, and the windproof cover is additionally arranged outside the working process of the three-pole discharger in order to prevent the influence of wind and air flow on the effect of the three-pole discharger under external environments such as an airport.
The first electrode is grounded by a high-voltage lead, the high-voltage lead (a plurality of leads are led out by the magneto) led out by the magneto to be measured is connected to the second electrode, the good insulation of the joint of the high-voltage lead and the second electrode is ensured, and otherwise, the measurement accuracy is influenced.
The third electrode has the function that when the voltage of the first electrode and the second electrode rises, due to the electrostatic induction effect between the second electrode and the third electrode, a potential difference is generated between the tip of the third electrode and the second electrode, under the action of the potential difference, gas between the second electrode and the third electrode is firstly ionized, small electric sparks are firstly formed, the small electric sparks and ultraviolet rays of the small electric sparks and gas ions formed when the small electric sparks jump over promote the gas between the first electrode and the second electrode to generate the ionization effect, so that the third electrode plays a role in pre-ionizing the gas between the first electrode and the second electrode, the breakdown voltage required by the first breakdown of the gas is reduced, and the voltage measured by the three-electrode discharger is relatively stable and accurate.
In the first case, when the third electrode is not provided, the first and second electrodes are discharged to generate a discharge voltage V1 to break down air.
In the second case, when the third electrode exists, the first and second electrodes generate a discharge voltage V2 during discharging, and when the voltage between the first and second electrodes rises due to the presence of the third electrode, a potential difference is generated between the tip of the third electrode and the second electrode due to the electrostatic induction between the second and third electrodes, and under the action of the potential difference, the gas between the second and third electrodes is ionized first, and a small spark is formed first, and the small spark, the ultraviolet ray of the small spark itself, and the gas ions formed when the small spark jumps over promote the gas between the first and second electrodes to be ionized. Thus, the third electrode can pre-ionize the gas of the first electrode and the gas of the second electrode, so that the breakdown voltage required by first breakdown of the gas is reduced, and the voltage measured by the third electrode is stable and accurate. The voltage V2 is less than V1.
The three-electrode discharger is characterized in that the angles a1 and a2 are 30-32 degrees, the lengths L4 and L5 are 15mm, and the length L1 is 5-7 mm. The diameter of the first electrode cylinder and the second electrode cylinder is 2.5mm. The distance between the central lines of the first and second electrodes and the plane of the support is not less than 25mm. The central lines of the first and second electrodes should be staggered by no more than 0.5mm. The angle of a3 is 30-32 degrees, the L3 is 0.05-0.1 mm, and the L2 is 2.3mm. The diameter of the third electrode cylinder position is 2.5mm.
After the magneto works, the first electrode and the second electrode begin to jump by sparks, when the magneto is stable in a state needing to be measured, the distance L1 between the first electrode and the second electrode can be adjusted, when the distance is increased, the sparks are interrupted from strong to weak, and when the sparks are adjusted to just enable the sparks to become a white-blue uninterrupted spark line, one minute of uninterrupted spark is observed, then the distance between the first electrode and the second electrode is measured, and the secondary voltage at the rotating speed can be determined according to the discharge energy curve of the magneto.
According to the requirements of fixed rotating speed and fixed distance L1 between the first electrode and the second electrode in the performance requirements of the magneto, whether the electric spark discontinuity phenomenon exists in the magneto test process can be determined in a visual and auditory combined mode. Thereby achieving the purpose of test.
The three electrodes are needle-like structures.
The electrode position of the tip end of the three-wire discharger is made of nickel wires, nickel-chromium wires or nickel-manganese wires, the electrode seat connected with the electrode is made of brass, zirconium copper and the like, the support is made of aluminum brass, and the base is made of an insulating material.
The three electrodes can meet the use requirements of different aviation magneto motors through various proposed gap adjustment.
The preliminary ionization of the third electrode may assist the three-pin discharger in breaking down the gas.
The insulation resistance between the electrode and the auxiliary electrode should be above 10 megaohms.
The three-pin discharger can be used simultaneously in a plurality of groups and can simultaneously measure a plurality of cables led out by the magneto.
The invention has made the real object and has been applied in the batch production, have achieved the good result. The system can perform in-cylinder simulation on the electric spark discharge condition of the magneto in the cylinder body of the engine, can obtain an evaluation conclusion through evaluation on the simulation effect, can test the excellent discharge performance of the magneto by combining fixed parameters in the testing process of the magneto, can perform secondary voltage test by combining the discharge energy curve of the magneto, can provide a reliable test result for a long time in practical application, and meets the requirement of spark test check of the magneto for the piston engine.
Claims (5)
1. The utility model provides an aviation is needle-like tripolar discharger for magneto test, its characterized in that includes: the three electrodes are respectively a first electrode, a second electrode and a third electrode, and are fixed on the respective electrode seats, wherein the electrode seats of the first electrode and the second electrode are fixed on the base through respective supports, the third electrode is fixed on the base through the electrode seats, and the third electrode is positioned below the tip of the second electrode; the first electrode is grounded through a high-voltage lead, the second electrode is connected to a high-voltage lead led out by a magnetor to be measured, and the third electrode is an auxiliary electrode and is completely insulated; the base is an insulating pad;
the first electrode and the second electrode are working electrodes which are respectively a positive electrode and a negative electrode of a loop, the central lines of the two working electrodes are positioned on the same straight line, and the electrodes are inserted into the upright post holes of the electrode holder; the angles a1 and a2 of the tips of the first electrode and the second electrode, the relative distance L1 and the lengths L4 and L5 of the tips of the first electrode and the second electrode are used for controlling the state of the electric spark; the relative distance L1 is used to control the overall breakdown voltage; the third electrode is an auxiliary electrode and is not connected to a circuit formed by the first electrode and the second electrode, the size L3 of a gap between the third electrode and the second electrode, the angle a3 of the tip end of the third electrode and the horizontal distance L2 between the vertex of the tip end of the third electrode and the vertex of the tip end of the second electrode are used for reducing breakdown voltage and maintaining spark stability, the angles a1 and a2 are 30-32 degrees, the lengths L4 and L5 are 15mm, the length L1 is 5mm-7mm, the diameters of the cylindrical positions of the first electrode and the second electrode are 2.5mm, and the distance between the central line of the first electrode and the central line of the second electrode and the plane of a support is not less than 25mm; the angle a3 is 30-32 degrees, the L3 is 0.05mm-0.1mm, and the L2 is 2.3mm; the diameter of the third electrode cylinder is 2.5mm;
after the magneto works, the first electrode and the second electrode start to jump by sparks, when the magneto is stable in a state needing to be measured, the distance L1 between the first electrode and the second electrode can be adjusted, when the distance is adjusted to just enable the sparks to become a white-blue uninterrupted electric spark line, one minute of uninterrupted electric sparks are observed, then the distance between the first electrode and the second electrode is measured, and the secondary voltage at the current rotating speed can be determined according to the self discharge energy curve of the magneto.
2. A tripolar discharger according to claim 1 wherein the electrode is of a needle-like configuration, the tip of the electrode is made of nickel, nickel-chromium or nickel-manganese wire, the electrode portion connecting the electrode holder is made of brass or zirconium-copper, and the holder is made of aluminum brass.
3. A three-pole discharger according to claim 1 wherein the insulation resistance between the working electrode and the auxiliary electrode is above 10 megaohms.
4. A three-pole discharger according to claim 1 further comprising: the three-pole discharger is additionally provided with a gelatin glass windshield to prevent the influence of wind and air flow on the effect of the three-pole discharger under the external environment.
5. A three-pole discharger according to claim 1 wherein the electrode holder of the third electrode is threadedly connected to the base for height adjustment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111097992.0A CN113904217B (en) | 2021-09-18 | 2021-09-18 | Needle-shaped tripolar discharger for aviation magneto test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111097992.0A CN113904217B (en) | 2021-09-18 | 2021-09-18 | Needle-shaped tripolar discharger for aviation magneto test |
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| CN113904217A CN113904217A (en) | 2022-01-07 |
| CN113904217B true CN113904217B (en) | 2023-02-17 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812008A (en) * | 2012-11-08 | 2014-05-21 | 李品德 | Self-synchronizing trigger high capacity discharging gap |
| CN104482952A (en) * | 2014-09-25 | 2015-04-01 | 力帆实业(集团)股份有限公司 | Digital instrument detector and digital instrument detection system |
| CN206920569U (en) * | 2017-06-26 | 2018-01-23 | 南通华夏飞机工程技术股份有限公司 | A kind of aircraft maintenance magneto testboard |
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2021
- 2021-09-18 CN CN202111097992.0A patent/CN113904217B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812008A (en) * | 2012-11-08 | 2014-05-21 | 李品德 | Self-synchronizing trigger high capacity discharging gap |
| CN104482952A (en) * | 2014-09-25 | 2015-04-01 | 力帆实业(集团)股份有限公司 | Digital instrument detector and digital instrument detection system |
| CN206920569U (en) * | 2017-06-26 | 2018-01-23 | 南通华夏飞机工程技术股份有限公司 | A kind of aircraft maintenance magneto testboard |
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| CN113904217A (en) | 2022-01-07 |
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