JPH1142308A - Vertical wind tunnel for free fall training - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To simplify the arrangement of air passages, reduce losses, reduce the production cost, increase the silencing efficiency by arranging silencers in efficient positions, and reduce the noise in the training room. . SOLUTION: A horizontal blower 3 provided with silencers 2 and 4 on a suction side and a discharge side, an elbow section 5 provided on an outlet side of a discharge side muffler 4 and vertically guiding a discharged air flow, Reducer section 6 which restricts the air flow from elbow section 5 to make it uniform.
A training room 7 provided above the reducer unit 6 for suspending a trainee by a uniform upward flow, and an exhaust unit 8 provided above the training room and discharging exhaust gas from the training room to the atmosphere. , Is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical wind tunnel for free-fall training in which a trainee is suspended in the air at a wind speed simulating a descent speed for training in parachute descent and the like.

[0002]

2. Description of the Related Art In a descent with a parachute, there is a case where the descent is performed by pulling an open umbrella string from the beginning. However, as in the case of sky diving, the descent attitude is first controlled in a free descent state to reach the vicinity of a descent target point. After a while, open the umbrella, descend, and land. In order to train such a free descent state, a vertical wind tunnel for free descent training is used.

FIG. 5 shows an example of a conventional free-fall type simulated vertical wind tunnel of a blowing type. In the figure, the wind tunnel comprises a circular or polygonal outer cylinder 21 and an inner cylinder 22. Outer cylinder 21
Is covered with a bottom portion 23 and a top plate 24, and a space between the outer cylinder 21 and the inner cylinder 22 forms an air supply passage 25. The air supply passage 25 is horizontal at the bottom portion 23 and is connected to a ventilation passage 26 provided on the central axis of the outer cylinder 21 and the inner cylinder 22. A floating chamber 27 for realizing a free descent simulation state is provided at an upper portion of the air blowing passage 26, and an air discharging passage 28 is connected to the upper portion of the floating chamber 27.

An air supply port 29 is provided at an upper portion of the air supply passage 25, and sucks air, passes through a silencer 30, and passes through a ventilation passage 26.
Flows into. An axial flow vertical blower 31 is provided in the blower passage 26 to accelerate the sucked air to a speed necessary for floating the floating person in the floating chamber 27. A rectifying honeycomb 32 is provided at the outlet side of the axial-flow vertical blower 31,
A fall prevention net 33 is doubly stretched at the exit of the. A suction prevention net 34 is provided at the top of the floating chamber 27 to protect the floating person. The exhaust passage 28 is a floating chamber 27
One vertical passage exiting from the upper part, for example, 6 to 8
It is divided into books, the total cross-sectional area is made 6 to 8 times the vertical path, the flow velocity is made 1/6 to 1/8, and the muffler 30 provided at the outlet works effectively.

FIG. 6 is a view showing an example of a circulating free-fall simulated vertical wind tunnel, which is described in "Hydraulic and Pneumatic", Vol. 22, No. 4, Heisei 1991.
It was written in the July issue. This wind tunnel is provided with a blower directly connected to an electric motor at a lower part of an air passage, and circulates air by its rotation to generate a high-speed airflow. The swimming room is provided near the middle of the vertical air passage. There is no muffler because the wind path is closed and noise is hard to leak to the outside.

[0006]

In the case of the blow-out type wind tunnel shown in FIG. 5, the air supply passage 25 has a double structure surrounding the ventilation passage 26 and the exhaust passage 28, and the passage has many bends. The loss is large and the structure of the passage is complicated. In addition, since the position where the silencer 30 is placed is limited, the silencing efficiency is poor. Further, the floating chamber 27 was directly exposed to the noise of the blower 31. In the case of the circulating wind tunnel shown in FIG.
There is no muffler because there is little noise to the outside. The swimming room is directly exposed to the noise of the blower. In addition, since the temperature is high due to the circulation of air, a cooling device is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional wind tunnel equipment, and simplifies the arrangement of air passages, reduces losses, reduces manufacturing costs, and arranges a silencer at an efficient position. It is an object of the present invention to provide a device for improving noise reduction efficiency and gradually reducing noise in a training room.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a horizontal blower provided with a muffler on a suction side and a discharge side, and a discharge fan provided on an outlet side of a muffler on a discharge side. The elbow part which guides the air flow vertically, the reducer part which squeezes the air flow from this elbow part to make it a uniform flow, and the training which floats the trainee by the air flow provided on the upper part of this reducer part and upward A room, and an exhaust unit provided at an upper portion of the training room and discharging exhaust gas from the training room into the atmosphere.

The ventilation passage is L-shaped, and is simple, so that the pressure loss is small and the production is easy, so that the production cost is reduced. Further, since the silencers are provided on the suction side and the discharge side of the blower serving as a noise source, the silencer can be effectively silenced. The training room is supplied with an air flow that is silenced by the silencer on the discharge side, so that there is little noise.

According to the second aspect of the present invention, the exhaust portion is a louver that covers the top portion and discharges exhaust gas from the periphery of the side surface.

The exhaust part constituting the upper part of the training room is covered at the top, and exhausting air from around the side surface can prevent rain from entering the training room.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing the configuration of a vertical wind tunnel for free-fall training of the present embodiment, FIG. 2 is a view taken along the line XX of FIG. 1, and FIG. 3 is a view taken along the line YY of FIG. FIG. Intake side silencer 2 with air intake 1
Is provided on the intake side of the blower device 3. The blower device 3 includes a horizontal-type blower having a moving blade 3a directly connected to the electric motor 3c and a guide blade 3b provided downstream of the moving blade 3a, and a blower casing 3d to which the blower is attached.
A soundproof material 3e provided on the outer peripheral surface of the blower casing 3d.

A discharge side silencer 4 is provided on the discharge side of the blower device 3.
An elbow portion 5 is provided at the outlet side of the discharge-side silencer 4 to guide the air flow vertically by a guide vane 5a. The outlet of the elbow 5 is connected to a reducer 6 which narrows the flow to make the flow uniform and increases the flow velocity. The diameter of the reducing section 6 is, for example, 5 mΦ on the entry side.
Thus, the diameter on the output side is 2.5 mΦ. A cylindrical training room 7 is connected to the upper part of the reducer section 6. FIG.
As shown in the figure, the reducer 6 and the training room 7 are coaxially connected, and the trainee swims by the airflow blown up from the reducer 6. The diameter of the training room 7 is, for example, 6 mΦ. The velocity of the blown-up airflow is, for example, about 70 m / s. In addition, the electric motor 3c of a blower is 1000-1500
kw capacity.

A discharge section 8 is provided above the training room 7. The discharging portion 8 has a structure in which it is once squeezed in a circular shape and then expanded in an octagonal shape. An octagonal top plate 8a is provided on the top portion, and air is discharged by a louver 9 provided on a side surface. It is supposed to.

FIG. 4 shows the structure of a muffler provided before and after the blower. This silencer is a splitter type silencer and has a thickness of 10 mm in a duct 11 at intervals of, for example, 150 mm.
A 0 mm splitter 12 is arranged, and the three flow paths are parallel. The splitter 12 contains a sound absorbing material. By setting the duct 11 to have a square shape of 7.0 × 4.5 m and the length of the splitter 12 to be about 2.2 m, a noise reduction of 27 dB can be achieved.

[0016]

As described above, according to the present invention, since the arrangement of the air passage is a simple L-shape, the pressure loss can be reduced and the manufacturing cost can be reduced. Further, by providing the silencers before and after the blower of the noise source, the silencing efficiency can be increased. In addition, by providing the muffler at a position where there is little interference with the others, the prediction accuracy in the design stage such as the capability and function is improved, and an appropriate soundproof device can be provided. Further, since the muffler is provided between the blower and the training room, noise in the training room can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a wind tunnel for free-fall training of the present invention.

FIG. 2 is a plan view as viewed in the direction of arrows XX in FIG. 1;

FIG. 3 shows a training room in the YY arrow view of FIG. 1;

FIG. 4 is a diagram illustrating an example of a configuration of a muffler.

FIG. 5 is a diagram showing a configuration of a conventional blow-down type free descending wind tunnel.

FIG. 6 is a diagram showing a configuration of a conventional circulating free-fall wind tunnel.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 air intake 2 intake-side silencer 3 blower device 3a rotor blade 3b guide vane 3c electric motor 3d blower casing 3e soundproofing material 4 discharge-side silencer 5 elbow section 5a guide vane 6 reducer section 7 training room 8 discharge section 9 louver 11 duct 12 splitter

Continuing on the front page (72) Inventor Mamoru Shimada 1-15-18 Hyakunincho, Shinjuku-ku, Tokyo Inside INC Engineering Co., Ltd.

Claims (2)

[Claims] 1. A horizontal blower provided with silencers on the suction side and the discharge side, an elbow part provided on the outlet side of the discharge side silencer for vertically guiding the discharged air flow, and air from the elbow part. A reducer section that narrows the flow to provide a uniform flow, a training room that is provided above the reducer section and floats the trainee by an upward air flow, and an exhaust air that is provided above the training room and is exhausted from the training room. A vertical wind tunnel for free-fall training, comprising: an exhaust part that discharges air into the vertical tunnel. 2. The vertical wind tunnel for free-fall training as claimed in claim 1, wherein the exhaust unit has a louver whose top is covered and discharges exhaust air from the periphery of the side surface.