JPH0214069B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slow descent machine used for descending from a high-rise building and evacuating in the event of a fire or the like.

As this type of slow descent aircraft, one has already been devised in which the rotor blades are rotated at high speed by the movement of the rope that suspends the person, and braking is applied by the resistance of the air (for example, Japanese Patent Application No. 137848/1983) Unexamined Japanese Patent Publication 1983-
(See No. 41571). This method is superior in that it provides smooth and stable braking force. However, in this system, the rotor blades are exposed to the outside air, so there is a possibility that water, glass fragments, etc. may enter the rotor blades during fire extinguishing activities, causing malfunctions. For this reason, it is desirable to have a sealed structure, and such a structure is already known (Japanese Utility Model Publication No. 133198/1983), but experiments have shown that simply sealing the blade will cause the rotor to spin idly. Therefore, sufficient braking force cannot be obtained. It is also known to seal the rotor blade and immerse it in a viscous fluid such as oil (Japanese Patent Publication No. 40-3520), but this tends to cause problems in fluid sealing performance and cold resistance.

Therefore, the present invention uses rotor blades, has a sealed structure,
Moreover, it was completed with the aim of obtaining a slow descent machine that can obtain sufficient braking force without using any fluid other than air.

That is, the present invention provides a rotary blade that rotates at a higher speed for moving a rope for suspending a person, a fixed blade that is located on the outer periphery of this rotary blade and constitutes a centrifugal pump together with this rotary blade, and a fixed blade that is provided on the side of the rotary blade. This slow descent aircraft is characterized by having a gap that serves as a flow path for returning the air that has flowed to the fixed blade to the center of the rotor blade, and a sealed case that accommodates the rotary blade, the fixed blade, and the gap.

Next, the present invention will be specifically explained with reference to illustrated embodiments. A rope 10 is wound around a pulley 12, with both ends extending downward. This rope 1
Harnesses (not shown) for connecting people are attached to both ends of the building, and these are used alternately to descend and evacuate. 14, . . . are push rollers, which are connected to the hanging ring 18 by connecting plates 16, .
Therefore, when a load is applied to the rope 10, the rope 10
is pressed against the pulley 12 and the pulley 12 is rotated without slipping according to the movement of the rope 10 due to the descent of the person. Note that 20 is a guide roller. The rotation of this pulley 12 is caused by a gear 22 directly connected to the pulley 12, a gear 24, 26 or a gear 24',
The increased speed is transmitted to the gear 28 via the gear 26', so that the rotor 32, which is connected to the gear 28 by the shaft 30, is rotated at a high speed. A fixed wing 34 is located on the outer periphery of the rotary wing 32. A sealed case 36 houses the rotary blade 32 and the fixed blade 34. A gap 38 is formed between the sealing case 36 and the side of the rotor blade 32, and through this gap 38, air flows to the fixed blade as the rotor blade 32 rotates and returns to the center of the rotor blade 32 again. Sealed case 36
By attaching a wire mesh, unevenness 40 is formed on the surface in contact with the air gap 38, so that the air flow passing through the air gap 38 is resisted. In addition, parts such as pulleys and gears are completely sealed in this gradual descent machine.

Since this slow descent machine has the above configuration, the rope 1
When a person hangs down from one end of the rotor 32, the rotor 32 rotates at high speed through the pulleys and gears, causing the air inside the sealed case 36 to flow from the center of the rotor 32 to the outer periphery while rotating with the rotor 32. , collides with the fixed blade 34, passes through the gap 38, and generates a flow that returns to the center of the rotary blade 32 again while receiving resistance from the unevenness 40, and this flow generates a braking force. That is, the rotary blade 32 and the fixed blade 34 constitute a centrifugal pump,
The unevenness 40 applies a resistance force to the air flow of the air 38 caused by this pump, and a load is applied to this centrifugal pump so that it performs work through rotation, thereby obtaining a braking force.

According to the experiment, the diameter of the pulley is 40 mm, the speed increasing ratio of the gear is 25, the rotor is 140 mm in diameter, 40 mm in width, and the number of blades is 6.
When the fixed blade has a height of 15 mm and the number of blades is 5, and the sealed case has an inner diameter of 180 mm and a width of 65 mm, the load is 70
The 15m descent time for Kg was approximately 20 seconds, which is considered the optimal value. In addition, in this case, if the wire mesh was removed, the same time was approximately 12 seconds.

In the above embodiment, the unevenness 40 is formed of a wire mesh, but the same effect can be obtained even if the unevenness is formed on the surface of the sealed case itself. As is clear from the above experiment, the unevenness 40 has the effect of increasing the braking force, so using it can reduce the size of the entire slow descent aircraft, but if the rotor blade is made slightly larger, this can be reduced. You can stay there.

As described above, the present invention is of a type that obtains braking force through air resistance, has a sealed structure, and is capable of obtaining sufficient braking force. Therefore, there is no risk of water, etc. entering the interior during firefighting and causing malfunction. Of course, since air resistance is used, there are no problems with sealing performance or cold resistance, and it goes without saying that the smooth and stable braking force unique to this type can be obtained.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a side sectional view, FIG. 2 is a sectional view taken along the line - - of the previous figure, FIG. Figure -
FIG. 10...rope, 32...rotor wing, 34...fixed wing,
36... sealed case, 38... void, 40... unevenness.

Claims (1)

[Claims] 1. A rotary blade that rotates at high speed by the movement of a rope that hangs a person; a fixed blade that is located on the outer periphery of this rotary blade and together with this rotary blade constitutes a centrifugal pump; and a rotary blade that is provided on the side of the rotary blade and that flows to the fixed blade. The air, which serves as a flow path for returning the air to the center of the rotor, and the rotor,
What is claimed is: 1. A slow descent aircraft comprising a fixed wing and a sealed case that houses a plane and has a surface in contact with the plane with unevenness that acts as air flow resistance.