CN108225486B

CN108225486B - Low oil level warning method for large transportation aircraft

Info

Publication number: CN108225486B
Application number: CN201611153933.XA
Authority: CN
Inventors: 游波; 王乐; 陈明生
Original assignee: R&d Institute Of China Aviation Industry General Aircraft Co ltd
Current assignee: South China Aircraft Industry Co Ltd of China Aviation Industry General Aircraft Co Ltd
Priority date: 2016-12-14
Filing date: 2016-12-14
Publication date: 2021-09-14
Anticipated expiration: 2036-12-14
Also published as: CN108225486A

Abstract

The invention belongs to airplane alarm design, and particularly relates to a low oil level alarm method for a large transportation airplane. At present, when an airplane flies in a large attitude, the difference between the fuel quantity in an airplane fuel tank and the low-fuel-level warning fuel quantity is large when warning in advance or warning is easy to occur, so that misjudgment of a pilot is caused and the completion of a flying task is influenced. According to the low oil level warning method for the large-scale transportation aircraft, the oil collecting tank and the inner partition cabin are respectively provided with the high oil level annunciator and the low oil level annunciator, so that the problem that a low oil level warning signal gives a long-time warning when ground refueling is solved; when the fuel charge of the airplane is less, a low fuel level alarm signal is continuously sent out; meanwhile, the phenomenon that the fuel quantity in an aircraft fuel tank is greatly different from the low oil level warning fuel quantity when the low oil level warning is given in advance and is given an alarm when the aircraft flies in a large posture is prevented. The reliability of low oil level warning is improved, and the pilot can judge the residual oil quantity of the airplane and complete the flight task.

Description

Low oil level warning method for large transportation aircraft

Technical Field

The invention belongs to airplane alarm design, and particularly relates to a low oil level alarm method for a large transportation airplane.

Background

The large transport airplane generally adopts left and right symmetrically arranged wing fuel tanks to supply oil to an engine, each wing fuel tank for supplying oil is symmetrically provided with an independent low oil level alarm signal to provide alarm information for a pilot, and the alarm principle is that a low oil level annunciator is arranged in each wing oil collecting tank, and when the airplane flies in a cruising way, the oil quantity of the wing fuel tanks reaches a low oil level alarm oil level, an alarm signal is sent. In the low oil level warning method, because each oil collecting tank of the wing is only provided with the low oil level annunciator and is arranged at a relatively higher position of the oil collecting tank, the low oil level warning signal is eliminated after the low oil level annunciator lasts for a longer time in the process of refueling the airplane; when the oil filling amount is small, the oil level in the oil tank is lower than the low oil level warning oil level after oil filling, and the low oil level warning signal continuously sends out a warning signal; when the aircraft flies in a large attitude, the difference between the fuel quantity in the aircraft fuel tank and the low-fuel-level warning fuel quantity is large when early warning or warning is easy to occur, so that misjudgment of a pilot is caused and the completion of a flight task is influenced.

Disclosure of Invention

According to the low oil level warning method for the large-scale transportation aircraft, the oil collecting tank and the inner partition cabin are respectively provided with the high oil level annunciator and the low oil level annunciator, so that the problem that a low oil level warning signal gives a long-time warning when ground refueling is solved; when the fuel charge of the airplane is less, a low fuel level alarm signal is continuously sent out; meanwhile, the phenomenon that the fuel quantity in an aircraft fuel tank is greatly different from the low oil level warning fuel quantity when the low oil level warning is given in advance and is given an alarm when the aircraft flies in a large posture is prevented.

The invention relates to a low-oil-level warning method for a large-scale transport aircraft, which is used for monitoring the fuel state in a wing fuel tank, wherein the wing fuel tank is divided into a fuel collecting tank, an inner compartment and an outer compartment by a semi-sealing rib, a partition plate one-way valve is arranged at the bottom of the semi-sealing rib, a fuel collecting tank low-oil-level annunciator is arranged at the upper part of the fuel collecting tank, an inner compartment low-oil-level annunciator is arranged at the lower part of the inner compartment, and the installation position of the inner compartment low-oil-level annunciator is the oil level crossing position of fuel overflowing from the fuel collecting tank in the inner compartment when the inner compartment is steeply lifted and emergently glided; when the oil collecting tank low oil level annunciator and the inner compartment low oil level annunciator are triggered simultaneously, the low oil level alarm device gives an alarm.

Further, the upper part of the semi-sealing rib is provided with a through hole for overflowing and ventilating.

Furthermore, the inner bay low-oil-level annunciator and the oil-collecting tank low-oil-level annunciator adopt a dry-spring float-type annunciator.

Compared with the prior art, the invention has the beneficial effects that: the low oil level alarm signal is eliminated in a short time in the process of refueling the airplane; when the fuel filling amount is less, the low oil level alarm signal can not be continuously alarmed; under various flight attitudes, the situations that the low oil level alarm is advanced and the difference between the fuel quantity in the aircraft fuel tank and the low oil level alarm fuel quantity is large when the alarm is given do not occur, so that the reliability of the low oil level alarm is improved, and the judgment of the pilot on the residual fuel quantity of the aircraft and the completion of the flight task are ensured.

Drawings

FIG. 1 is a schematic view of the internal arrangement of a wing fuel tank of the present invention in a forward direction;

FIG. 2 is a schematic view of the fuel distribution during refueling and during refueling;

FIG. 3 is a schematic view of a low oil level warning during cruising or in a low attitude;

FIG. 4 is a schematic diagram of the fuel distribution when the fuel overflows from the large-attitude fuel collection tank;

figure 5 is a cross-sectional view of the inner compartment illustrating the location of the installation of the low-level annunciator on the inner compartment.

1-oil collecting tank, 2-baffle one-way valve, 3-inner baffle cabin low oil level annunciator, 4-inner baffle cabin, 5-outer baffle cabin, 6-wing fuel tank, 7-wing semi-sealing rib, 8-oil collecting tank low oil level annunciator, 9-low oil level alarm device and 10-overflow hole

Detailed Description

The invention will be further described by means of embodiments in conjunction with the accompanying drawings in which:

referring to fig. 1, in this embodiment, the method for warning of low oil level of a large transportation aircraft includes: the low-oil-level warning device comprises an oil collecting tank 1, a partition plate one-way valve 2, an inner compartment low-oil-level annunciator 3, an inner compartment 4, an outer compartment 5, a wing fuel tank 6, a semi-sealing rib 7, an oil collecting tank low-oil-level annunciator 8 and a low-oil-level warning device 9.

The wing fuel tank 6 is divided into an oil collecting tank 1, an inner compartment 4 and an outer compartment 5 by a semi-sealing rib 7, and the upper part of the semi-sealing rib 7 is provided with a through hole with oil spilling and ventilation functions. The low oil level warning annunciators are arranged in the oil collecting tank 1 and the inner compartment 4, the oil collecting tank low oil level annunciator 8 is arranged at the position of triggering the low oil level warning oil level in the cruising state, the position is higher, and the inner compartment low oil level annunciator 3 is arranged at the position of crossing oil quantity and liquid overflowing from the oil collecting tank in the large-posture of bending down and bending up, and the position is lower, as shown in fig. 5. When the oil-collecting tank low-level annunciator 8 and the inner compartment low-level annunciator 3 are simultaneously connected, the low-level alarm device 9 sends a low-level alarm signal.

When the fuel is filled, the fuel in the wing fuel tank 6 is filled according to the flow sequence of the outer compartment → the inner compartment → the oil collecting tank. When the fuel is consumed, the outer compartment 5 and the inner compartment 4 deliver the fuel to the oil collecting tank 1 through injection and then deliver the fuel to the engine through the fuel supply pump, and the fuel in the wing fuel tank 6 is consumed according to the sequence of the outer compartment → the inner compartment → the oil collecting tank.

In the process of refueling, as shown in fig. 2, because the installation position of the inner bay low-level annunciator 3 is low, fuel quickly submerges the inner bay low-level annunciator 3 through the partition one-way valve 2, so that a low-level warning signal is quickly eliminated; similarly, when the oil consumption of the flight task is less, the continuous alarm of the low oil level can not be generated.

When the airplane is in a cruising state or in a small-attitude flying state, as shown in fig. 3, the injection oil supply capacity is larger than the oil consumption of an engine, the injection redundant fuel oil flows to the inner compartment 4 through the overflow hole 10 at the upper part of the oil collecting tank semi-sealing rib 7, the oil collecting tank 1 is in a substantially full oil state, the fuel oil in the fuel tank 6 of the oil wing is consumed along with the consumption of the fuel oil, the fuel oil in the inner compartment is consumed first, the inner compartment low oil level annunciator 3 is firstly communicated, the oil collecting tank low oil level annunciator 8 is communicated again, and the low oil level alarm device 9 sends an alarm signal;

when the aircraft flies in a large attitude, as shown in fig. 4, because the oil level of the wing fuel tank 6 changes due to the rapid change of the attitude of the aircraft, the fuel in the oil collecting tank 1 flows to the inner compartment 4 through the overflow hole 10 at the upper part of the semi-sealing rib 7, the oil level of the oil collecting tank 1 is rapidly reduced, when the oil level of the oil collecting tank 1 is lower than the oil collecting tank low-oil-level annunciator 8, the oil collecting tank low-oil-level annunciator 8 is connected, but the inner compartment low-oil-level annunciator 3 is not connected, so that the low-oil-level alarm device 9 cannot send out a low-oil-level alarm signal.

In conclusion, the low-oil-level warning device sends out the warning method by installing the low-oil-level annunciators in the oil collecting tank and the inner compartment in the wing fuel tank of the large-sized transport aircraft, and when the oil collecting tank and the inner compartment low-oil-level annunciator are simultaneously connected, so that the problem that the low-oil-level warning signal gives a long-time warning in the refueling process of the aircraft is solved; when the fuel charge of the airplane is less, a low fuel level alarm signal is continuously sent out; when the aircraft flies in a large posture, the phenomena of advance warning of low oil level and larger difference between the fuel quantity in an aircraft fuel tank and the low oil level warning fuel quantity during warning easily occur, and the pilot is ensured to judge the residual fuel quantity of the aircraft and complete the flight task.

Claims

1. A low-fuel-level warning method for a large-scale transport aircraft is used for monitoring the fuel state in a wing fuel tank (6), the wing fuel tank (6) is divided into an oil collecting tank (1), an inner compartment (4) and an outer compartment (5) through a semi-sealing rib (7), a partition one-way valve (2) is installed at the bottom of the semi-sealing rib (7), and the low-fuel-level warning method is characterized in that: the method is characterized in that an oil collecting tank low oil level annunciator (8) is arranged at the upper part of an oil collecting tank (1), an inner compartment low oil level annunciator (3) is arranged at the lower part of an inner compartment (4), and the installation position of the inner compartment low oil level annunciator is an oil level crossing position of fuel overflowed from the oil collecting tank (1) in the inner compartment (4) during steep rise and emergency gliding; the upper part of the semi-sealing rib is provided with an overflow hole (10), wherein when the oil collecting tank low oil level annunciator (8) and the inner compartment low oil level annunciator (3) are triggered simultaneously, an alarm is given through a low oil level alarm device (9);

when the airplane is in cruising state or flying in a small posture, the injection oil supply capacity is larger than the oil consumption of an engine, the injection redundant fuel oil flows to the inner bay (4) through the overflow hole (10) at the upper part of the oil collecting tank semi-sealing rib (7), the oil collecting tank (1) is in a basically full oil state, the fuel oil in the inner bay is consumed firstly, the inner bay low oil level annunciator (3) is connected firstly, the oil collecting tank low oil level annunciator (8) is connected secondly, and the low oil level alarm device (9) sends an alarm signal;

when the airplane flies in a large attitude, the oil level of a wing fuel tank (6) is changed due to the rapid change of the attitude of the airplane, the fuel in the oil collecting tank (1) flows to the inner compartment (4) through the overflow hole (10) at the upper part of the semi-sealing rib (7), the oil level of the oil collecting tank (1) is rapidly reduced, when the oil level of the oil collecting tank (1) is lower than the low oil level annunciator (8) of the oil collecting tank, the low oil level annunciator (8) of the oil collecting tank is connected, but the low oil level annunciator (3) of the inner compartment is not connected at the moment, so that the low oil level alarm device (9) cannot send a low oil level alarm signal.

2. The low oil level warning method for the large transport-type airplane according to claim 1, characterized in that: the inner bulkhead low oil level annunciator (3) and the oil tank low oil level annunciator (8) adopt dry spring float type annunciators.