CN112918699A - Method for eliminating fault of early lighting of signal lamp of certain type of machine consumption set - Google Patents
Method for eliminating fault of early lighting of signal lamp of certain type of machine consumption set Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 claims abstract description 9
- 230000008439 repair process Effects 0.000 claims abstract description 7
- 238000013024 troubleshooting Methods 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 121
- 239000000446 fuel Substances 0.000 description 43
- 239000002828 fuel tank Substances 0.000 description 20
- 239000000295 fuel oil Substances 0.000 description 11
- 230000007423 decrease Effects 0.000 description 9
- 230000008030 elimination Effects 0.000 description 5
- 238000003379 elimination reaction Methods 0.000 description 5
- 238000007689 inspection Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000005484 gravity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
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- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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- 230000001960 triggered effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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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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- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
- Level Indicators Using A Float (AREA)
Abstract
The invention discloses a fault eliminating method for early lighting of a certain type of consumption group signal lamp, which standardizes the adjusting process, directly reflects the oil consumption requirement on the machine in float valve repair, and converts the angle requirement on the machine on the float valve into the height requirement on ground adjustment of the float valve, so that the repaired float valve can be used on the machine without repeated troubleshooting. The requirement of the angle of the float valve on the machine is converted into the requirement of the height of the float valve on the ground.
Description
Technical Field
The application relates to a fault scheme of a helicopter fuel system, in particular to a fault removing method for early lighting of a signal lamp of a certain type consumption group.
Background
A certain helicopter is a Russian imported helicopter, and the imported helicopter carries technical information and is only suitable for daily maintenance of a fuel system. In order to facilitate repair and maintenance, most spare parts of the helicopter are made into a country in the daily repair process, so that the fault phenomenon that a signal lamp of a consumption group of a fuel system is turned on in advance is caused, and the phenomenon is inconsistent with technical data, so that the fuel system is seriously disordered in work.
As the helicopter enters the overhaul stage in China, the fault phenomena are increased increasingly and obviously, the faults are caused under the comprehensive action of the overhaul of the helicopter and the localization of most spare parts, and the imported accompanying technical data does not have an applicable solution. In order to ensure that the helicopter can normally operate and the next service cycle of the fuel system can be ensured, the fault that the consumption group signal lamp of the fuel system is lightened early must be eliminated.
Disclosure of Invention
The application provides a fault elimination method for early lighting of a signal lamp of a certain type of consumption group of a certain type of helicopter, which analyzes the fault phenomenon, defines the fault reason, provides an elimination scheme and improvement suggestions and defines the correct fault elimination direction for subsequent similar fault elimination of the helicopter.
Specifically, the method is realized through the following technical scheme:
1. the potentiometer trigger device for providing the consumption group signal on the machine is changed, so that the burning time of the consumption group signal lamp meets the requirement on the machine.
Firstly, adjusting the height value of a potentiometer in a fuel quantity sensor of a left fuel tank and a right fuel tank No. 5;
a, determining the angle deviation of a potentiometer according to the fault phenomenon on the machine and the value difference fed back by a consumption group signal lamp;
b, adjusting the angle of a potentiometer of the oil tank sensor;
② float opening height of float valve for adjusting lower oil transportation float on machine
a, determining the angle deviation of a lower oil transportation floater valve according to the fault phenomenon on the machine and the numerical difference fed back by a consumption group signal lamp;
b, adjusting the angles of the upper oil transportation floater valve and the lower oil transportation floater valve;
2. the adjustment process is standardized, the oil consumption requirement on the machine is directly reflected in the float valve repair, and the angle requirement on the machine on the float valve is converted into the height requirement on the ground adjustment float valve, so that the repaired float valve can be used on the machine without repeated troubleshooting.
Firstly, the requirement of the angle of the float valve on the machine is converted into the requirement of the height of the float valve on the ground.
a, an oil transportation float valve.
The valve angle alpha of the upper oil transportation floater is between 97 and 100 degrees
After conversion to height: the height A is 20mm on the central line
b, lower oil transportation float valve.
The valve angle alpha of the lower oil transportation float is between 102 and 107 degrees
After conversion to height: the height A is 38mm on the central line
Secondly, the method for adjusting the float valve on the ground is fixed. As shown in fig. 3, the height a is adjusted.
a, determining the failure detection height A of the float valve.
b, determining the quantity to be adjusted according to the failure detection height value A.
c, loosening 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 nut is screwed down, the height value A of the float valve is measured by using a height gauge and a special tool, and after the required height is met, the nut is protected by using a split pin, so that the height of the float is ensured not to change any more.
Compared with the prior art, the invention has the following beneficial effects:
1) the potentiometer trigger device for providing the consumption group signal on the machine is changed, so that the burning time of the consumption group signal lamp meets the requirement on the machine.
2) The adjustment process is standardized, the oil consumption requirement on the machine is directly reflected in the float valve repair, and the angle requirement on the machine on the float valve is converted into the height requirement on the ground adjustment float valve, so that the repaired float valve can be used on the machine without repeated troubleshooting.
Drawings
FIG. 1 is a tank profile.
Fig. 2 is a distribution diagram of a valve of an oil transportation float and an oil quantity sensor.
Fig. 3 is a schematic structural diagram of an oil transportation float valve.
Fig. 4-5 show the float valve mounting bracket.
Fig. 6 is a fuel consumption estimation table.
FIG. 7 is a failure data table.
Fig. 8 shows the fuel gauge of each group of fuel tanks when the consumption group signal lamp is on after adjustment.
Detailed Description
The invention is further described below with reference to the figures and examples.
The fuel system is one of the most important systems of a 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 reason, provides a removing scheme and an improvement suggestion, and defines the correct fault removing direction for the subsequent similar fault removal of the helicopter.
Consumption group signal lamp: an indicator light for prompting fuel consumption to a specified position;
a float valve: the switch is used for controlling the time for starting oil transportation (starting oil consumption of the engine) on the machine.
The fuel system of a certain helicopter consists of a left oil tank, a right oil tank, a distribution system, a pipeline, an oil filling and discharging mechanism, a ventilation system, an operation accessory and an inspection instrument. The left and right oil tanks are respectively composed of a left oil tank 1, a right oil tank 2, a left oil tank 3, a right oil tank 4, a left oil tank 5 and a right oil tank 7, and the distribution of the oil tanks is shown in figure 1.
And adding each oil tank to the required oil quantity in a centralized oiling mode. The oil quantity is controlled by an oil level float valve in the oil tank, when the float valve rises to a specified height, the float valve is closed, the supply of fuel oil is cut off, and the centralized refueling is finished.
When the helicopter flies, fuel oil is supplied to the left engine and the right engine through the fuel oil booster pumps in the left fuel tank and the right fuel tank No. 2 through the fuel oil supply pipelines respectively, and fuel oil in the left fuel tank No. 1, the right fuel tank No. 3, the left fuel tank No. 4 and the right fuel tank No. 4 is supplied to the left fuel tank No. 5 and the right fuel tank through the fuel oil booster pumps in the left fuel tank No. 1 and the right fuel tank No. 4 respectively through the. The fuel oil in the left and right No. 5 and No. 7 fuel tanks flows to the left and right No. 2 fuel tanks through gravity. Thereby creating a fuel supply to the engine.
In order to ensure that the center of gravity of the helicopter is within an allowable range when the fuel is consumed, the fuel consumption sequence is limited. The left side sequence is: left 1 → left 3+4 → left 5+7+2, in the right order: right 3+4 → right 1 → right 5+7+ 2. The sequential control is controlled by an upper oil transportation float valve and a lower oil transportation float valve which are arranged at the rear parts of a left oil tank and a right oil tank No. 5. Meanwhile, when the fuel in any fuel tank of No. 5 on the left and the right is consumed to a specified position (5 +7 fuel quantity 610L +/-30L on the left side and 5+7 fuel quantity 690L +/-30L on the right side), the consumption group signal lamp is lighted.
When a consumption group signal lamp is lighted in the test flight process of a certain type of helicopter in our factory, the total oil quantity of the helicopter is about 2400L and is far higher than a standard value 1800L.
On the premise of centralized refueling, fuel consumption of left and right engines is kept balanced in the flight process, when a consumption group signal lamp is lighted, the fuel quantity of the left side 5+7 is 610L +/-30L, the fuel quantity of the right side 5+7 is 690L +/-30L, and 250L fuel oil in left and right No. 2 fuel tanks is added to the fuel oil, so that the total amount is 1800L. Therefore, when the consuming group lamp is on, the total oil amount should be displayed at about 1800L, and the actual oil amount 2400L is much higher than the standard value.
The engine supplies fuel by No. 2 oil tanks, No. 5+7 oil tanks supply No. 2 oil tanks through the gravity mode, along with the decline of fuel liquid level, the float height of the upper oil transportation float valve in No. 5 oil tanks reduces gradually, the valve opens gradually, fuel in the left 1 (right 3+4) oil tank supplies in No. 5 oil tanks through the upper float valve at this moment, when the fuel volume that the engine consumed keeps peaceful with the fuel supply volume of left 1 (right 3+4) oil tank toward No. 5 oil tanks, the system reaches the balance, the fuel liquid level in No. 5 oil tanks no longer descends. As 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 lower oil transportation float valve in the No. 5 oil tank is gradually reduced, the valve is gradually opened, at the moment, fuel in the left 3+4 (right 1) oil tank is supplied to the No. 5 oil tank through the lower float valve, when the fuel consumption of the engine and the fuel supply amount of the left 3+4 (right 1) oil tank to the No. 5 oil tank are kept flat, the system reaches balance, and the fuel liquid level in the No. 5 oil tank does not decline any more. In addition, as the fuel liquid level decreases, the height of the float of the fuel quantity sensor in the No. 5 fuel tank also decreases, when a certain height is reached, a potentiometer inside the sensor is triggered, the potentiometer gives a signal, and the consumption group signal lamp is lighted at the moment.
On the premise of centralized refueling, fuel consumption of left and right engines is kept balanced in the flying process, when a consumption group signal lamp is lighted, the fuel quantity of the left side 5+7 is 610L +/-30L, the fuel quantity of the right side 5+7 is 690L +/-30L, and 250L fuel oil in left and right No. 2 fuel tanks accounts for about 1800L. Therefore, when the consuming group lamp is on, the total oil amount should be displayed at about 1800L, and the actual oil amount 2400L is much higher than the standard value.
Through analysis, the phenomenon has two reasons, namely that the lighting time controlled by a potentiometer in the oil mass sensor of the No. 5 oil tank is not correct and is higher than a theoretical value; secondly, the height of the floater is too low when the lower oil transportation floater valve is opened and is lower than that of the sensor floater when the lamp is turned on, as shown in figure 2, H is a negative value, so that the lower floater valve is not opened or is not opened completely when the lamp is turned on, and fuel oil is still in the left 3+4 (right 1) oil tank.
According to the analysis result, the problem that a consumption group signal lamp is turned on in advance needs to be solved, and the two aspects of an oil quantity sensor and a lower oil transportation floater valve need to be started:
1. checking oil quantity sensor potentiometer angle
The oil consumption of the engine is simulated through a ground oil sequence test. The lighting timing controlled by the potentiometer in the oil gauge sensor of the left and right No. 5 oil tanks is checked.
2. Checking the opening timing of the lower oil transfer float valve
The oil consumption of the engine is simulated through a ground oil sequence test. The opening timing of the lower oil transfer float valve is checked by the change of the oil quantity of the left 3+4 (right 1) oil tank.
3. When the consumption group signal lamp is lighted, the oil quantity in the left 5+7 oil tank is 630L and is between the standard value 610L +/-30L. When the consumption group signal lamp is on, the oil quantity in the right 5+7 oil tank is 670L, and is between 690L +/-30L.
4. Upon examination, the left 5+7 oil volume was shown to be 750L, well above 610L + -30L as the left 3+4 oil volume began to decrease. When the right 1 oil volume began to decrease, the right 5+7 oil volume was shown as 500L, well below 690L + -30L.
After inspection, the burning time of the consumption group signal lamp controlled by the oil quantity sensor potentiometer is in a standard range and meets the requirement. When the right 1 oil volume begins to decrease, the right 5+7 oil volume is 500L, which is far below 690L +/-30L, which means that the consumption group signal lamp is already lighted when the right 1 oil tank does not begin to convey oil, and the right 1 oil tank is in a full oil state. Under the condition that the fuel consumption of the left engine and the right engine are consistent, the total fuel quantity is 2340L which is basically consistent with the fault phenomenon when the consumption group signal lamps are lighted according to the estimation of the table 1.
The inspection and analysis result shows that the failure reason is that the opening time of the lower oil transportation floater valve in the No. 5 oil tank on the right is too late. After reviewing the related art document, there is no clear standard requirement for the size a in fig. 3, and only the adjustment of the size a according to the pre-decomposition record is specified. Data measured at the time of the incoming inspection (positive above the center line, negative below) are recorded in table 2.
The data in the table shows that the size A of each helicopter is very different and irregular, if the helicopter is adjusted according to factory-entering data, the oil quantity difference controlled by the float valve of each helicopter is very large, particularly the size A is small or even negative, the oil level controlled by the float valve is probably lower than that of a consumption group signal lamp controlled by an oil quantity sensor potentiometer when the consumption group signal lamp is lighted, and therefore early lighting faults of the consumption group signal lamp are caused.
According to the actual situation, and according to fig. 2, the following adjustments are made:
1. the lower oil transportation floater valve is completely opened, and the height of the right 5+7 oil mass sensor is at the upper limit of a burning standard value of a consumption group signal lamp, namely H1 is more than 0, so that the oil transportation time is earlier than the burning time of the consumption group signal lamp;
2. the lower oil transportation floater valve is completely closed, and when the upper oil transportation floater valve is completely opened, namely H2 is more than 0, so that the interference between the first oil transportation time and the second oil transportation time is avoided;
3. when the upper oil transportation float valve is completely closed, namely H3 is more than 0, the oil tank is ensured to be normally ventilated when pressure oil filling is carried out.
Through adjustment, referring to fig. 3, the angle alpha of the upper oil transportation floater valve is between 97 and 100 degrees, and the angle alpha of the lower oil transportation floater valve is between 102 and 107 degrees.
Scheme verification:
after the angle alpha of the upper and lower oil transportation floater valve is adjusted, the pressure oiling and ground oil using sequence test are carried out again.
1. Pressure refueling check, right 5+7 fuel quantity display 850, compared with the prior adjustment, unchanged, and the analysis reason is that the height of a refueling float valve of a right 7 fuel tank is higher than the height of an upper oil transportation float valve of a right 5 after adjustment;
2. when the oil consumption on the ground is checked sequentially and the oil quantity on the right 1 begins to decrease, the oil quantity on the right 5+7 is displayed as 730L and is out of the interval of 690L +/-30L;
3. the ground oil consumption sequence is checked, when a consumption group signal lamp is lighted, the total oil quantity is displayed at 1820L, and the residual oil quantity of each group of oil tanks is shown in a table 3 and meets the requirements;
4. and (4) flight inspection, which is to inspect the lighting time of the consumption group signal lamp by combining with airspace flight subjects, wherein the total oil quantity is displayed as 1850L when the lamp is lighted, and meets the requirements.
In summary, the fault elimination scheme passes ground verification, and faults are well eliminated.
The adjustment process is standardized, the oil consumption requirement on the machine is directly reflected in the float valve repair, and the angle requirement on the machine on the float valve is converted into the height requirement on the ground adjustment float valve, so that the repaired float valve can be used on the machine without repeated troubleshooting. The specific transformation process is as follows:
1. and determining the central line of the float valve, detecting the float valve before adjustment, and measuring the height A of the float valve. After the center line of a plurality of (more than 50) float valves is measured, the center line positions of the float valves are equivalent, and in order to ensure the measurement accuracy, a special measurement tool support for the float valves is manufactured, which is shown in figure 4 in detail.
2. And pre-judging the height value of the fault detection to determine the height to be adjusted.
3. Unscrewing the adjusting nut prepares to adjust the height a of the float valve.
4. And rotating the pull rod to adjust the height of the float valve until the required height A is reached.
The float valve for oil transportation. The height A is 20mm on the central line
② the lower oil transportation float valve. The height A is 38mm on the central line
5. After the screw cap is screwed down, the height value A of the float valve is measured by using the height gauge and the special tool bracket, and after the required height is met, the screw cap is protected by using the split pin, so that the height of the float is ensured not to change.
Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A fault removing method for early lighting of a certain type of machine consumption group signal lamp is characterized in that:
the method comprises the following steps:
the method comprises the steps that a potentiometer trigger device for providing a consumption group signal on the machine is changed, so that the burning time of a consumption group signal lamp meets the requirement on the machine;
the method specifically comprises the following steps:
1) checking the angle of a potentiometer of the oil mass sensor;
simulating the oil consumption of an engine through a ground oil using sequence test, and checking the lighting time controlled by a potentiometer in a No. 5 oil tank oil meter sensor;
2) checking the opening time of a lower oil transportation floater valve;
through a ground oil consumption sequence test, oil consumption of an engine is simulated, and the opening time of a lower oil transportation floater valve is checked through the oil quantity change of a left 3+4 (right 1) oil tank;
3) adjusting the height value of a potentiometer in a left oil tank oil quantity sensor and a right oil tank oil quantity sensor No. 5;
4) the float opening height of the lower oil transportation float valve is adjusted on the machine.
2. The method of claim 1, further comprising the step of performing early ignition of a signal lamp of a certain type of consumable set: 3) determining the angle deviation of a potentiometer according to the fault phenomenon on the computer and the value difference fed back by a consumption group signal lamp, and adjusting the angle of the potentiometer of the oil tank sensor; 4) in the step, according to the fault phenomenon on the machine and the numerical difference fed back by the consumption group signal lamp, the angle deviation of the lower oil transportation float valve is determined, and the angles of the upper oil transportation float valve and the lower oil transportation float valve are adjusted.
3. The method of claim 1, further comprising the step of performing early ignition of a signal lamp of a certain type of consumable set:
the method further comprises the following steps:
the adjustment process is standardized, the oil consumption requirement on the machine is directly reflected in the float valve repair, and the angle requirement on the machine on the float valve is converted into the height requirement on the ground adjustment float valve, so that the repaired float valve can be used on the machine without repeated troubleshooting.
4. The method of claim 3, wherein the method further comprises the step of performing early lighting of a signal lamp of the certain type of consumable set:
1) the requirement for the angle of the float valve on the machine is converted into the requirement for adjusting the height of the float valve on the ground;
a, an upper oil transportation floater valve;
the angle alpha of the upper oil transportation floater valve is 97-100 degrees;
after conversion to height: the height A is 20mm above the central line;
b, a lower oil transportation floater valve;
the angle alpha of the valve of the lower oil transportation floater is between 102 degrees and 107 degrees;
after conversion to height: the height A is 38mm above the centerline.
5. The method of claim 3, wherein the method further comprises the step of performing early lighting of a signal lamp of the certain type of consumable set:
2) the method for adjusting the float valve on the ground is fixed, and the height A of the float valve is adjusted;
a, determining the failure detection height A of the float valve;
b, determining the quantity to be adjusted according to the failure detection height value A;
c, loosening 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 nut is screwed down, the height value A of the float valve is measured by using a height gauge and a tool, and after the required height is met, the nut is protected by using a split pin, so that the height of the float is ensured not to change any more.
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