CN112918699B - Trouble shooting method for raising pre-ignition and brightening of certain machine consumption group signal lamp - Google Patents
Trouble shooting method for raising pre-ignition and brightening of certain machine consumption group signal lamp Download PDFInfo
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- CN112918699B CN112918699B CN202110076169.5A CN202110076169A CN112918699B CN 112918699 B CN112918699 B CN 112918699B CN 202110076169 A CN202110076169 A CN 202110076169A CN 112918699 B CN112918699 B CN 112918699B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000013024 troubleshooting Methods 0.000 title claims abstract description 16
- 238000005282 brightening Methods 0.000 title claims abstract description 5
- 230000008569 process Effects 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 230000002028 premature Effects 0.000 claims 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000008439 repair process Effects 0.000 abstract description 6
- 230000008030 elimination Effects 0.000 abstract description 4
- 238000003379 elimination reaction Methods 0.000 abstract description 4
- 239000000446 fuel Substances 0.000 description 50
- 239000002828 fuel tank Substances 0.000 description 12
- 230000007423 decrease Effects 0.000 description 9
- 238000007689 inspection Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000008676 import Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/40—Maintaining or repairing aircraft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/60—Testing or inspecting aircraft components or systems
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Transportation (AREA)
- Aviation & Aerospace Engineering (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
- Level Indicators Using A Float (AREA)
Abstract
The invention discloses a fault elimination method for improving the pre-ignition and the brightening of a signal lamp of a certain type of machine consumption group, which standardizes the adjustment process, directly reflects the oil consumption requirement on the machine in the repair of a float valve, and converts the angle requirement on the float valve on the machine into the height requirement for adjusting the float valve on the ground, so that the repaired float valve can meet the use on the machine without repeated troubleshooting. The angle requirement of the float valve on the machine is converted into the height requirement of the float valve on the ground.
Description
Technical Field
The application relates to a scheme of helicopter fuel system faults, in particular to a fault removal method for improving the pre-ignition and the brightening of a certain engine consumption group signal lamp.
Background
The helicopter of a certain type is of a Russian import model, and import carried technical data is only suitable for daily maintenance of a fuel system. In order to repair and maintain conveniently, most parts of the helicopter are domesticated in the daily repair process, so that the fault phenomenon that the fuel system consumption group signal lamp is lightened early is brought, and the phenomenon is inconsistent with technical data, so that the fuel system work is seriously disturbed.
As the helicopter enters the repair stage in China, the fault phenomenon is increasingly and obviously increased, the fault is caused by the comprehensive effects of the helicopter repair and the localization of most parts, and imported accompanying technical data does not have an applicable solution. In order to allow the helicopter to operate normally and to ensure the next service cycle of the fuel system, the early-lighting of the fuel system consuming group signal lamp must be eliminated.
Disclosure of Invention
The method for eliminating the faults of the consumption group signal lamp of the helicopter for improving the pre-ignition brightness of the consumption group signal lamp of the helicopter analyzes the fault phenomenon, clarifies the cause of the fault, provides an elimination scheme and an improvement suggestion, and clarifies the correct troubleshooting direction for the follow-up fault elimination of the same type of helicopter.
Specifically, the application is realized by the following technical scheme:
1. the potentiometer triggering device for giving the consumption group signal on the machine is changed, so that the lighting time of the consumption group signal lamp meets the machine requirement.
(1) Adjusting the height values of potentiometers in the oil quantity sensors of the left and right No. 5 oil tanks;
a, determining the angle deviation of a potentiometer according to the fault phenomenon on the machine and the numerical value difference fed back by the consumption group signal lamp;
b, adjusting the angle of a potentiometer of the oil tank sensor;
(2) on-board adjustment of float opening height of lower oil delivery float shutter
a, determining the angle deviation of a valve of the oil delivery float according to the fault phenomenon on the machine and the numerical value difference fed back by the consumption group signal lamp;
b, adjusting the angles of the upper oil conveying floater valve and the lower oil conveying floater valve;
2. the adjustment process is standardized, the oil consumption requirement on the machine is directly reflected in the repairing of the float valve, and the angle requirement on the float valve on the machine is converted into the height requirement of the float valve on the ground for adjusting the float valve, so that the repaired float valve can meet the requirement of the machine for use without repeated troubleshooting.
(1) The angle requirement of the float valve on the machine is converted into the height requirement of the float valve on the ground.
a, an oil delivery float valve is arranged on the upper part of the container.
The valve angle alpha of the upward oil delivery floater is between 97 and 100 degrees
After conversion to height: height A is 20mm on the central line
b, descending an oil conveying floater valve.
The angle alpha of the valve of the oil-delivering floater is 102-107 DEG
After conversion to height: height A is 38mm on the central line
(2) The method for adjusting the float valve on the ground is immobilized. As shown in fig. 3, the height a is adjusted.
a determines the false detection height A of the float valve.
And b, determining the amount to be adjusted according to the fault detection height value A.
c unscrewing the screw cap, rotating the pull rod, and adjusting the height of the float valve until the required height A is reached.
e, after the screw cap is screwed, the height A of the float valve is measured by a height ruler and a special tool, and after the height meets the requirement, the screw cap is ensured by a cotter pin, so that the float height is not changed any more.
Compared with the prior art, the invention has the following beneficial effects:
1) The potentiometer triggering device for giving the consumption group signal on the machine is changed, so that the lighting time of the consumption group signal lamp meets the machine requirement.
2) The adjustment process is standardized, the oil consumption requirement on the machine is directly reflected in the repairing of the float valve, and the angle requirement on the float valve on the machine is converted into the height requirement of the float valve on the ground for adjusting the float valve, so that the repaired float valve can meet the requirement of the machine for use without repeated troubleshooting.
Drawings
Fig. 1 is a diagram of a tank distribution.
Fig. 2 is a diagram of the oil delivery float trap and oil sensor profiles.
Fig. 3 is a schematic diagram of the valve structure of the oil delivery float.
Fig. 4-5 illustrate a float trap mounting bracket.
Fig. 6 is a table of fuel consumption estimates.
FIG. 7 is a table of fault detection data.
Fig. 8 shows the fuel gauges of each group of fuel tanks when the consumption group signal lamp is lighted after adjustment.
Description of the embodiments
The invention is further described below with reference to the drawings and examples.
The fuel system is one of the most important systems of the helicopter and is mainly used for supplying fuel to the power plant engine of the helicopter. The invention analyzes the fault phenomenon, defines the fault cause, provides the troubleshooting scheme and the improvement opinion, and defines the correct troubleshooting direction for the subsequent fault elimination of the same type of helicopter.
Consumption group signal lamp: an indicator light for indicating that fuel is consumed to a specified position;
float valve: and a switch for controlling the timing of starting oil delivery (starting oil consumption of the engine) on the machine.
The fuel system of a helicopter consists of left and right groups of fuel tanks, a distribution system, pipelines, a refueling and discharging mechanism, a ventilation system, an operating accessory and an inspection instrument. The left and right oil tanks are respectively composed of left and right No. 1, left and right No. 2, left and right No. 3, left and right No. 4, left and right No. 5 and left and right No. 7, and the distribution of the oil tanks is shown in FIG. 1.
Each tank is added to the desired quantity of fuel by means of centralized fueling. The oil quantity is controlled by the oil level float valve in the oil tank, when the float valve rises to a specified height, the float valve is closed, the fuel supply is cut off, and the centralized oiling is finished.
When the helicopter flies, fuel is supplied to the left and right engines through fuel booster pumps in the left and right No. 2 fuel tanks respectively, and fuel in the left and right No. 1, left and right No. 3 and left and right No. 4 fuel tanks is supplied to the left and right No. 5 fuel tanks through fuel delivery pipelines respectively through fuel booster pumps in the left and right No. 1 and left and right No. 4 fuel tanks respectively. Fuel in the left and right No. 5 and left and right No. 7 fuel tanks flows to the left and right No. 2 fuel tanks through gravity. Thereby forming a fuel supply to the engine.
In order to ensure that the centre of gravity of the helicopter is within the allowable range when fuel is consumed, the fuel consumption sequence is limited. The left side sequence is: left 1- & gt left 3+4- & gt left 5+7+2, and the right side is in the following sequence: right 3+4→right 1→right 5+7+2. The sequential control is performed by upper and lower oil delivery float valves arranged at the rear parts of the left and right No. 5 oil tanks. Meanwhile, when the fuel in either the left and right 5-th fuel tanks is consumed to a specified position (the left side 5+7 oil amount 610 L+ -30L, the right side 5+7 oil amount 690 L+ -30L), the consumption group signal lamp is turned on.
When the consumption group signal lamp fires in the test flight process of a certain helicopter in a factory, the total oil quantity of the helicopter is about 2400L and is far higher than the standard value 1800L.
On the premise of centralized refueling, left and right engine fuel consumption is kept balanced in the flying process, when a consumption group signal lamp is lighted, the left side 5+7 fuel quantity is between 610 L+/-30L, the right side 5+7 fuel quantity is between 690 L+/-30L, and the total fuel quantity of 250L in the left and right No. 2 fuel tanks is 1800L. Therefore, when the consuming group lamp is lighted, the total oil quantity should be displayed at about 1800L, and the actual oil quantity is 2400L, which is far higher than the standard value.
The engine is supplied with fuel by No. 2 oil tank, 5+7 oil tank passes through gravity mode supply No. 2 oil tank, along with the decline of fuel liquid level, the float height of the defeated oil float valve of going up in the No. 5 oil tank reduces gradually, the valve opens gradually, the fuel in the 1 (right 3+4) oil tank of left side is supplied with in the No. 5 oil tank through last float valve this moment, when the fuel volume of engine consumption and the fuel volume of keeping level of 1 (right 3+4) oil tank to the No. 5 oil tank of left side, the system reaches equilibrium, the fuel liquid level in the No. 5 oil tank no longer descends. As the fuel in the left 1 (right 3+4) tank is consumed, the fuel level in the No. 5 tank will drop again to ensure the running consumption of the engine. Along with the continuous decline of fuel liquid level, the float height of the oil delivery float valve in the No. 5 oil tank gradually decreases, and the valve is opened gradually, and the fuel in the left 3+4 (right 1) oil tank is supplied to the No. 5 oil tank through the oil delivery float valve at this moment, and when the fuel quantity consumed by the engine and the fuel supply quantity of the left 3+4 (right 1) oil tank to the No. 5 oil tank stay at ordinary times, the system reaches balance, and the fuel liquid level in the No. 5 oil tank is no longer declined. In addition, along with the decline of fuel liquid level, the float height of the oil mass sensor in the No. 5 oil tank also will be along with the decline, when reaching certain height, triggers the inside potentiometer of sensor, and the potentiometer will give the signal, consumes the group signal lamp and will fire this moment.
On the premise of centralized refueling, the fuel consumption of the left and right engines is kept balanced in the flying process, when the consumption group signal lamp is lighted, the fuel quantity of the left side 5+7 is 610 L+/-30L, the fuel quantity of the right side 5+7 is 690 L+/-30L, and the total fuel quantity of 250L in the left and right No. 2 fuel tanks is 1800L. Therefore, when the consuming group lamp is lighted, the total oil quantity should be displayed at about 1800L, and the actual oil quantity is 2400L, which is far higher than the standard value.
The analysis shows that the phenomenon is caused by two reasons, namely, the lighting time controlled by the potentiometer in the left and right No. 5 oil tank oil quantity sensors is not right and is higher than the theoretical value; secondly, the height of the floater is too low when the valve of the oil-delivering floater is opened and is lower than the height of the floater of the sensor when the lamp is lighted, as shown in fig. 2, H is a negative value, so that the valve of the floater is not opened or is not completely opened when the lamp is lighted, and fuel is also contained in the left 3+4 (right 1) fuel tank.
According to analysis results, to solve the problem of early lighting of the consumption group signal lamp, the oil quantity sensor and the oil delivery float valve need to be started from two aspects:
1. checking the angle of potentiometer of oil quantity sensor
And through a ground oil consumption sequence test, simulating the oil consumption of the engine. And checking the lighting time controlled by the potentiometer in the left and right No. 5 oil tank oil gauge sensors.
2. Checking the opening time of the valve of the oil-delivering float
And through a ground oil consumption sequence test, simulating the oil consumption of the engine. The opening time of the valve of the oil delivery float is checked through the oil quantity change of the left 3+4 (right 1) oil tank.
3. Through inspection, when the consumption group signal lamp is on, the oil quantity in the left 5+7 oil tank is 630L and is between the standard value 610 L+/-30L. When the consumption group signal lamp is lighted, the oil quantity in the right 5+7 oil tank is 670L and is within 690 L+/-30L of a standard value.
4. When checked, the left 3+4 oil starts to decrease, the left 5+7 oil shows 750L, well above 610 L+ -30L. When the right 1 oil starts to decrease, the right 5+7 oil is shown to be 500L, well below 690 L+ -30L.
After inspection, the consumption group signal lamp controlled by the oil quantity sensor potentiometer is in a standard range when the consumption group signal lamp is lighted, and meets the requirements. When the right 1 oil quantity starts to decrease, the right 5+7 oil quantity is 500L and is far lower than 690 L+/-30L, which means that the consumption group signal lamp is already on under the condition that the right 1 oil tank does not start to deliver oil, and the right 1 oil tank is in a full oil state. When the fuel consumption of the left and right engines is the same, the total fuel consumption is 2340L when the fuel consumption group signal lamp is on, according to the estimation shown in fig. 6, and the failure phenomenon is basically matched.
The inspection and analysis results show that the failure is caused by too late opening time of the valve of the oil delivery floater in the right No. 5 oil tank. Through looking at the related art document, there is no explicit standard requirement for the dimension a in fig. 3, and only the adjustment of the dimension a according to the record before decomposition is specified. In fig. 7, data measured at the time of the factory entry check are recorded (positive above the center line, negative below).
As can be seen from the data in fig. 7, the size a of each helicopter is very different and has no regularity, if the data is adjusted according to the factory entering data, the oil quantity controlled by the float valve of each helicopter will be very different, especially the size a is small or even negative, the oil level controlled by the float valve will be likely to be lower than the oil level when the consuming group signal lamp controlled by the oil quantity sensor potentiometer is lighted, so that the consuming group signal lamp is lighted early, and the occurrence of the lighting fault is caused.
According to the actual situation, and according to fig. 2, the following adjustments are made:
1. the valve of the oil delivery float is completely opened, and the height of the right 5+7 oil quantity sensor is higher than the upper limit of the consumption group signal lamp lighting standard value, namely H1 is more than 0, so that the oil delivery time is ensured to be earlier than the consumption group signal lamp lighting time;
2. when the lower oil delivery float valve is completely closed and the upper oil delivery float valve is completely opened, namely H2 is more than 0, the first oil delivery time and the second oil delivery time are ensured not to be interfered;
3. when the valve of the oil-feeding floater is completely closed, namely H3 is more than 0, the normal ventilation of the oil tank during pressure oil filling is ensured.
Through adjustment, referring to fig. 3, the upper oil delivery float valve angle alpha is between 97 and 100 degrees, and the lower oil delivery float valve angle alpha is between 102 and 107 degrees.
Scheme verification, as shown in fig. 8:
and after adjusting the angle alpha of the upper and lower oil delivery float valves, re-performing pressure oiling and ground oil sequence tests.
1. The oil quantity of the right 5+7 is displayed 850 after the pressure oil filling inspection, and compared with the oil quantity before adjustment, the oil quantity is unchanged because the oil filling float valve height of the right 7 oil tank is higher than the oil conveying float valve height after adjustment of the right 5 upper oil conveying float valve;
2. when the oil consumption sequence of the ground is checked and the right 1 oil quantity starts to decrease, the right 5+7 oil quantity is 730L and is outside a 690 L+/-30L interval;
3. the ground oil consumption sequence is checked, when the consumption group signal lamp is lighted, the total oil quantity is displayed 1820L, the residual oil quantity of each group of oil tanks is shown in figure 8, and the requirements are met;
4. and (3) flight inspection, namely, combining airspace flight subjects, inspecting the lighting time of the consumption group signal lamp, and displaying 1850L of total oil quantity when the consumption group signal lamp is lighted, so that the requirements are met.
In summary, the troubleshooting scheme passes ground verification and faults are well removed.
The adjustment process is standardized, the oil consumption requirement on the machine is directly reflected in the repair of the float valve, and the angle requirement of the machine on the float valve is converted into the height requirement of the ground adjustment float valve, so that the repaired float valve can meet the requirement of the machine for use, and repeated troubleshooting is not needed. The specific transformation process is as follows:
1. and determining the center line of the float valve, performing fault detection on the float valve before adjustment, and measuring the height A of the float valve. Through the measurement and calculation of the central lines of a plurality of float valves (more than 50), the central line positions of the float valves are equivalent, and a special measuring tool support for the float valves is manufactured for ensuring the measuring accuracy of the float valves, and particularly, the special measuring tool support is shown in fig. 4.
2. And pre-judging the height value of the fault detection, and determining the height to be adjusted.
3. Unscrewing the adjustment screw cap prepares to adjust the height a of the float trap.
4. The pull rod is rotated to adjust the height of the float valve until the required height A is reached.
(1) And (5) feeding the oil to the float valve. Height A is 20mm on the central line
(2) And (5) descending an oil conveying floater valve. Height A is 38mm on the central line
5. After the nuts are screwed, the height A of the float valve is measured by a height ruler and a special tool support, and after the height meets the requirement, the nuts are protected by cotter pins, so that the float height is ensured not to change any more.
While the invention has been described with reference to the preferred embodiments, it is not intended to limit the invention thereto, and it is to be understood that other modifications and improvements may be made by those skilled in the art without departing from the spirit and scope of the invention, which is therefore defined by the appended claims.
Claims (5)
1. A trouble shooting method for improving the pre-ignition and the brightening of a signal lamp of a certain machine consumption group is characterized in that:
the method comprises the following steps:
the potentiometer triggering device giving the consumption group signal on the machine is changed, so that the lighting time of the consumption group signal lamp meets the machine requirement;
the method comprises the following steps:
1) Checking the potentiometer angle of the oil quantity sensor;
through a ground oil consumption sequence test, the oil consumption of the engine is simulated, and the lighting time controlled by potentiometers in the left and right No. 5 oil tank oil gauge sensors is checked;
2) Checking the opening time of a valve of the oil delivery floater;
simulating the oil consumption of the engine through a ground oil consumption sequence test, and checking the opening time of a valve of the oil delivery float through the oil quantity change of the left 3+4 and right 1 oil tanks;
3) Adjusting the height values of potentiometers in the oil quantity sensors of the left and right No. 5 oil tanks;
4) The float opening height of the valve of the lower oil delivery float is adjusted on the machine.
2. The method for troubleshooting a premature ignition of a certain machine-consuming group signal lamp according to claim 1, wherein: 3) Determining the angle deviation of the potentiometer according to the fault phenomenon on the machine and the numerical value difference fed back by the consumption group signal lamp, and adjusting the angle of the potentiometer of the oil tank sensor; 4) In the step, according to the failure phenomenon on the machine and the numerical difference fed back by the consumption group signal lamp, the angle deviation of the lower oil conveying float valve is determined, and the angles of the upper oil conveying float valve and the lower oil conveying float valve are adjusted.
3. The method for troubleshooting a premature ignition of a certain machine-consuming group signal lamp according to claim 1, wherein:
the method further comprises the steps of:
the adjustment process is standardized, the oil consumption requirement on the machine is directly reflected in the repairing of the float valve, and the angle requirement on the float valve on the machine is converted into the height requirement of the float valve on the ground for adjusting the float valve, so that the repaired float valve can meet the requirement of the machine for use without repeated troubleshooting.
4. A method of troubleshooting a machine-consuming group signal for early ignition of a machine-consuming group signal as set forth in claim 3, wherein:
converting the angle requirement of the float valve on the machine into the height requirement of the float valve regulated on the ground;
a, feeding an oil delivery floater valve;
the valve angle alpha of the upper oil delivery floater is between 97 and 100 degrees;
after conversion to height: the height A is 20mm on the central line;
b, descending an oil conveying floater valve;
the angle alpha of the valve of the oil delivery float is 102-107 degrees;
after conversion to height: height a is 38mm on the centerline.
5. A method of troubleshooting a machine-consuming group signal for early ignition of a machine-consuming group signal as set forth in claim 3, wherein:
the method for adjusting the float valve on the ground is immobilized, and the height A of the float valve is adjusted;
a, determining the fault detection height A of a float valve;
b, determining the quantity to be adjusted according to the fault detection height value A;
c, unscrewing the screw cap, rotating the pull rod, and adjusting the height of the float valve until the required height A is reached;
e, after the screw cap is screwed, the height A of the float valve is measured by a height ruler and a tool, and after the height meets the requirement, the screw cap is ensured by a cotter pin, so that the float height is not changed any more.
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