JPH02238130A - airplane jet propulsion system - Google Patents

Abstract

PURPOSE:To prevent to absorb a bird and the like, and a deterioration of the propulsion efficiency respectively, by projecting plural movable flaps as well as intersecting plural movable bone members provided at the tip opening of an engine housing each other, when an airplane takes off or lands. CONSTITUTION:A barrel-shaped housing 10 to house a jet engine is provided, and an opening 11 is formed at the top end. And at the top part of the housing 10, plural upper bone members 12a and 12b and plural lower bone members 13a and 13b are installed rotatable through shafts 14 and 15 respectively. Moreover, at the top part of the housing 10, plural circular arc grooves 16 are formed at the peripheral area of the opening 11, in which flaps 17 are housed respectively. And when the airplane takes off or lands, the bone members 12a-13b are extended respectively and intersected each other to cover the opening 11, and a bird and the like are prevented from being absorbed into the opening 11. At the same time, the flaps 17 are extended to lead in the air flowing along the outer surface of the housing 10 into the opening 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a jet propulsion device attached to the wing of an airplane.

[Prior Art] and [Problem to be Solved by the Invention] Jet propulsion systems for airplanes take in atmospheric air, use the oxygen in the air to burn fuel, and give the generated heat to the intake air to achieve high speed. It ejects backwards as a jet. Fifth
As shown in the figure, the jet propulsion device 1 is attached to the wing of an airplane. The jet propulsion device H1 includes a cylindrical housing 2 that houses a jet engine and has an opening at its tip for introducing air.

In recent years, airports where planes take off and land have been plagued by birds. When planes take off and land, birds can get sucked into the openings of the jet propulsion system, causing engine trouble. If a cover is provided to cover the opening of the jet propulsion device, inhalation of birds can be prevented. However, the presence of a cover in front of the opening reduces the air intake, thereby reducing the propulsion efficiency of the jet propulsion device.

Therefore, an object of the present invention is to provide a jet propulsion device that can prevent birds from being sucked in during takeoff and landing of an airplane, and does not reduce propulsion efficiency.

[Means for Solving the Problems] A jet propulsion device for an airplane according to the present invention includes a cylindrical housing, a plurality of movable bone members, and a movable flap.

The cylindrical housing houses a jet engine and has an opening at its tip for introducing air.

A plurality of movable bone members are attached to the distal end of the housing so as to be movable between a position across the front of the opening in the housing and a position fully exposing the opening.

The movable flap is disposed around the opening and is provided so as to be movable between a retracted position and an extended position.

When the movable flap is in the retracted position, the flap is housed in the distal end of the housing. On the other hand, when the movable flap is in the protruding position, the flap protrudes forward in a tapered shape from the distal end of the housing.

[Operations and Effects of the Invention] During takeoff and landing of the airplane, the plurality of movable bone members are brought to a position across in front of the opening of the housing. Since there are a plurality of movable bone members in front of the opening, a bird attempting to be sucked into the opening will collide with the bone members and be blown away. In this way, birds can be prevented from being sucked into the opening of the housing.

The presence of multiple bone members in front of the housing opening reduces air intake. To compensate, the movable flap is brought into a protruding position. When the movable flap is in the protruding position, the flap protrudes forward from the distal end of the housing in a tapered shape. Therefore, air passing through the outer periphery of the cylindrical housing is guided by the flap and sucked into the opening of the housing. Thus, when the movable flap is in the extended position, air intake is increased.

When the airplane is flying at high altitudes, the problem of birds being sucked into the jet propulsion system does not arise. Therefore, during high-altitude navigation, the plurality of movable bone members are brought to a position that fully exposes the opening of the housing. The movable flap is also brought to a retracted position where it is housed in the distal end of the housing.

As described above, according to the present invention, it is possible to prevent birds from being sucked in during takeoff and landing of an airplane, and it is also possible to prevent a decrease in propulsion efficiency.

[Embodiment] FIG. 1 is a sectional view showing an embodiment of the present invention.
The figure is its front view.

The jet propulsion device includes a cylindrical housing 10 that houses a jet engine. This housing 10 has an opening 11 at its tip for introducing air.

A plurality of upper bone members 12 are provided at the distal end of the housing 10.
a. 12b and a plurality of lower bone members 13a, 13b are rotatably mounted via shafts 14 and 15, respectively. As shown, each bone member 12a, 12
b, 13a, and 13b have a semicircular shape along the circumferential surface of the circular opening 11. In the state shown in FIGS. 1 and 2, the two upper bone members 12a, 12b are located one above the other in the upper region of the opening. The two lower bone members 13a, 13b are also located in the lower region of the opening 11, overlapping each other.

Each bone member 12a, 12b. 13a and 13b are rotated by a known drive mechanism (not shown). 3 and 4 show each bone member 12a, 12b, 13a, 1
3b shows the state after being rotated. In the state shown in FIGS. 3 and 4, each bone member 12a, 12b,
13a and 13b are located across the front of the opening 11 of the housing 10. On the other hand, in the state shown in FIGS. 1 and 2, each bone member 1 2 a, 1 2 b,
1 3 a, 13b are located along the circumferential surface of the opening 11, thereby exposing the entire opening 11.

A plurality of arcuate grooves 16 are formed in the peripheral area of the opening 11 at the tip of the housing 10 . The arcuate groove 16 is exposed at the end surface of the distal end of the housing 10, as shown in FIG. As shown in FIG. 2, the cross-sectional shape of the arcuate groove 16 is an arcuate shape extending parallel to the circumferential surface of the opening 11. As shown in FIG. The front shape (FIG. 2) formed by the plurality of arcuate grooves 16 is approximately circular. Each arcuate groove 16 is
As shown in FIGS. 1 and 3, it extends rearward from the end surface of the housing 10 at an angle.

The direction of inclination is toward the central axis of the housing 10. Therefore, the shape formed by the plurality of arcuate grooves 16 becomes a tapered shape that tapers toward the rear from the distal end surface of the housing 10.

A flap 17 is accommodated in each arcuate groove 16.

Each flap 17 is movable by a known drive mechanism (not shown).

In the state shown in FIGS. 1 and 2, each flap 17 is completely housed within the arcuate groove 16.

When each flap 17 is moved by a drive mechanism (not shown), each flap 17 extends forward in a tapered shape from the distal end of the housing 10, as shown in FIGS. 3 and 4. stand out.

Next, the operation will be explained.

During normal altitude flight of an airplane, each bone member 12a, 12
b, 13a, 13b and each flap 17 are both in the state shown in FIGS. 1 and 2. In this state,
Each bone member 1 2 a, 1 2 b, 13 a. 13b
The opening 11 of the housing 10 is completely exposed. Therefore, a large amount of air can be taken in through the opening 11. Since the problem of birds being sucked in does not occur when the airplane is flying at high altitudes, it is desirable to fully expose the opening 11 in order to increase the propulsion efficiency of the jet engine.

During takeoff and landing of an airplane, there is a risk that birds will be sucked in through the opening 11 of the housing 10.

Similar dangers also arise when airplanes fly at relatively low heights.

Therefore, each bone member 12a, 12b, 13a, 13b is
The third
The state shown in FIG. 4 and FIG.

In this state, each bone member 12a, 12b, 13a, 13
b is located across the opening 11 of the housing 10, so that a bird trying to be sucked into the opening 11 will collide with the bone members 12a, 12b, 13a, 13b and be thrown away.

Each bone member 12a, 12b, 13a. 13b are located across in front of the opening 11 of the housing 10, their presence reduces the amount of air intake from the opening 11. If this condition is left untreated, the propulsion efficiency of the jet engine will decrease.

Therefore, each flap 17 is moved by a drive mechanism (not shown) so as to protrude forward from the distal end of the housing 10, as shown in FIGS. 3 and 4. The plurality of flaps 17 protrude forward from the distal end of the housing 10 in a tapered shape.

Therefore, air passing through the outer peripheral surface of the housing 10 is guided by the flap 17 and introduced into the opening 11.

As explained above, a plurality of bone members 12a, 12b,
13a and 13b prevent birds from being sucked in during takeoff and landing of an airplane. The flap 17 includes bone members 12a and 12b.
, 13a, 13b, air passing through the outer periphery of the housing 10 is guided into the opening 11 in order to compensate for the reduced air intake due to the presence of the housing 10.

Note that the flap 17 and the bone members 12a, 12b, 13a,
13b may be operated simultaneously. Alternatively, depending on the situation, the flap 17 and the bone members 12a, 12b, 13
a and 13b may be operated separately. For example, first the flap 17 is operated, and then the bone members 1 2 a,
1 2 b, 1 3 a, and 13 b may also be used.

Further, when a bird collides with the bone members 12a, 12b, 13a, 13b, the bird is cut into pieces and the remains are left behind.
It is also conceivable that it remains on 2b, 13a, and 13b. However, even in that case, the flap 17 is
0, the debris will be separated from the bone component by the airflow flowing past the outer circumferential surface of the housing 10.

Furthermore, a sensor may be used to detect a collision between the bird and the bone member.

The embodiment illustrated in FIGS. 1 to 4 is merely an example embodying the invention. Therefore, various modifications and variations are possible within the scope of equivalents of this invention. For example, in the illustrated embodiment, the number of bone members is four, but the number is not limited to four. In addition, the illustrated bone members 12a, 12b, 13a, 13b are connected to the opening 1.
Although the opening 11 has a structure that crosses the front of the opening 11 in the horizontal direction, as a modification, it may have a structure that crosses the front of the opening 11 in the vertical direction. Additionally, a plurality of bone members extending laterally across the front of the aperture 11 may be connected to each other, such as by wires extending longitudinally across the front of the aperture 11.

Furthermore, it will be appreciated that different configurations of the bone members and flaps and their operating mechanisms may be employed.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of an embodiment of the present invention. FIG. 2 is a front view of one embodiment of the present invention. FIG. 3 is a partial sectional view showing the state after the bone member and the flap have been moved from the state shown in FIG. 1. Figure 4 shows
4 is a front view of the state shown in FIG. 3. FIG. FIG. 5 is a perspective view of an airplane equipped with a jet propulsion device. In the figure, 10 is a housing, 11 is an opening, 12a,
12b is an upper bone member, 13a and 13b are lower bone members, 1
4.15 is a shaft, 16 is an arcuate groove, and 17 is a flap. In addition, in each figure, the same number indicates the same or equivalent element.

Claims (1)

[Claims] A cylindrical housing that houses a jet engine and has an opening at its tip for taking in air, a position that crosses in front of the opening, and a position that fully exposes the opening. a plurality of movable bone members attached to the distal end of the housing so as to be movable between the two; a retracted position disposed around the opening and housed in the distal end of the housing; A jet propulsion device for an airplane, comprising: a movable flap that protrudes forward in a tapered shape from a distal end of a housing, and is movable between a protruding position and a protruding position;