JPH03125876A - Blizzard nozzle for artificial snow falling device - Google Patents

Abstract

PURPOSE:To obtain a nozzle for an artificial snow falling device, which is prominent in the distributions of blizzard concentration and air speed, by a method wherein the nozzle is provided with a slant plate at the tip of a deflector at the upstream side of the snow falling port of the same, a rectangular deflector below the snow falling port and a deflector having slanted configuration at the upper part of the downstream side of the snow falling port while said deflectors are moved respectively in vertical direction. CONSTITUTION:A snow falling port is provided with a rectangular deflector 5 at the lower part of the downstream side of the same and the other deflectors 4 having slanted plates at the upper part of the downstream of the same. These deflectors are operated in conjunction with each other. In an initial period, distances between the deflectors 4 and the deflector 5 are restrained within a given length in order to reduce the amount of snow remaining without being blown away, whereby the air speed is kept in a value higher than a given value. Subsequently, both of the upper deflectors 4 and the lower deflector 5 are operated up-and-down simultaneously. The flow of blizzard is moved in up-and-down direction by said operation and, therefore, the adjustment of the distribution of blizzard concentration may be effected. Finally, the upper deflectors 4 are moved up-and-down slightly. According to the slight movement, the height, whereat artificial snow fall through a throwing port changes the direction into horizontal flow, can be adjusted whereby the distribution of blizzard concentration may be adjusted delicately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a blowing snow nozzle for an artificial snow-making device, and particularly to a blowing snow nozzle for an artificial snow-making device suitable for reproducing a snowstorm condition.

[Conventional technology]

BACKGROUND ART Conventional snow blowing nozzles for artificial devices are known that simply blow out simulated snow made by a snowmaking machine from the nozzle. In addition,
An example of this type is the one described in JP-A-58-75678.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take into consideration the weather conditions where there is a large amount of snow, such as blizzards that occur in nature, and when conducting tests with large amounts of snow, it is necessary to store -30 degrees of snow. 6 [Means for Solving the Problems] In order to achieve the above object, the present invention provides a deflector tip on the upstream side of the snow removal opening of the nozzle. A diagonal plate, a rectangular deflector at the bottom of the snow drop, and a diagonal deflector at the upper downstream side of the snow drop are provided, and these deflectors are arranged to move in the vertical direction.

(Function) The deflector on the upstream side of the snow removal opening of the nozzle operates to increase the wind speed at the snow removal opening.As a result, the snow will not fall due to the blow-up action of static pressure.However, this deflector alone will The wind speed distribution is faster on the lower side of the nozzle eye, and the blowing snow density distribution becomes worse.Therefore, a rectangular deflector was installed at the lower part of the downstream side of the snow drop eye, and a deflector with a diagonal plate was further installed at the upper part of the downstream side of the snow drop eye. .These deflectors interact with each other to make the snowstorm concentration distribution uniform.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the snowstorm nozzle for an artificial snow-making device according to the present invention will be described below with reference to the drawings.

Figure 1 is a cross-sectional view of one embodiment of the snowmaking machine with 13 nozzles (
It has a snow-dropping shooter 2 above that drops simulated snow from (not shown). An upstream deflector 3 is provided in the upper part of this snowstorm nozzle 1 on the upstream side of the wind sent from a blower (not shown), and this upstream deflector 3 has a fulcrum 3a as its pivot. The mounting angle can be freely adjusted. An upper downstream deflector 4 is provided downstream of the upstream deflector 3 and above the nozzle 1 so as to be movable up and down within the snow removal shooter 2. Further, a lower downstream deflector 5 is provided below the hollow upper downstream deflector 4. The air cylinder 6a is for adjusting the mounting angle of the upstream deflector 3, and the air cylinder 6b moves the downstream upper deflector 4 up and down to adjust the height of the downstream upper deflector 4. It is for. Jacket 7 is stored in bit 8,
This is for moving the lower downstream deflector 5 up and down to adjust the height of the lower downstream deflector 5.

Next, the operation of the nozzle for artificial snowfall equipment having the above structure will be explained.

The upstream deflector 3 operates to increase the wind speed at the snow drop opening. The condensation ratio of a typical nozzle is about 4, and when the exit wind speed exceeds 60 km/H, the static pressure at the snow drop opening becomes about 20 mm Aq, and the snow stops falling due to the static pressure blowing up. This deflector 3 has the function of lowering static pressure by increasing the wind speed at the drop opening. However, if only the present deflector 3 is used, the wind speed distribution becomes faster on the lower side of the nozzle outlet, and it is difficult to adjust the blowing snow concentration distribution. Therefore, in this embodiment, a rectangular deflector 5 is provided at the lower downstream of the snow drop, and a deflector 4 having a diagonal plate is provided at the upper downstream. These deflectors operate in conjunction with each other.

First, in order to reduce the amount of snow remaining in the nozzle without being blown away, the distance between the deflectors 4 and 5 is kept within a certain length, and the wind speed is kept above a certain value. Next, both the upper deflector 4 and the lower deflector 5 are moved up and down simultaneously. As a result, the flow of the blizzard moves in the vertical direction, so the concentration distribution of the blizzard can be adjusted. Finally, for fine adjustment, move the upper deflector 4 up and down a small amount. This makes it possible to adjust the height at which the simulated snow falling from the inlet changes its flow in the horizontal direction, making it possible to fine-tune the snowstorm concentration distribution.

Generally, the operation of the deflector affects both the snowstorm concentration distribution and the wind speed distribution. The above operating method gives priority to the blowing snow concentration distribution, but the lower downstream deflector 5 improves the low wind speed above the exit, which has been a problem in the past, and also significantly improves the wind speed distribution.

The distribution accuracy obtained by this example is roughly ±10% of the snowstorm concentration distribution, as shown in FIGS. 2 and 3.

Wind speed distribution is ±10%.

FIG. 4 shows another embodiment that enables feedback control of the wind speed distribution.

Compared to the above embodiment, pitot tube 9. A differential pressure converter 10 and a calculator 11 are added. The vertical wind speed (pressure) is measured by the pitot tube 9, and converted into an electrical signal by the differential pressure converter 10. These two electric signals are compared by the calculator 11, and if the upper wind speed is low.

The downstream lower deflector 5 is moved upward, and when the upward wind speed is low, the downstream upper deflector 4 is moved downward.

According to this embodiment, there is an effect of improving the wind speed distribution at the outlet.

Further, another embodiment in which the amount of snow remaining in the snowstorm nozzle 1 is reduced is shown in FIG. 6. Compared to the embodiment shown in FIG. The length extends to the vicinity of the snowstorm nozzle opening.

By configuring as described above, as shown in FIG. 6, it is possible to prevent the generation of vortices in the downstream portion of the deflector. When a vortex is generated in the downstream portion, snow accumulates, but in this deflector 12, since no vortex is generated, no snow remains. According to this embodiment, the yield of snow inside the snowstorm nozzle can be reduced.

〔Effect of the invention〕

According to the present invention, it is possible to obtain a nozzle for an artificial snow-making device with excellent blizzard concentration distribution and wind speed distribution, and it is possible to carry out simulation tests under actual blizzard conditions.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of the noz/Q for an artificial snow-making device of the present invention, FIG. 2 is a diagram showing the blowing snow distribution accuracy obtained by the embodiment shown in FIG. 1, and FIG. 3 is a similar diagram. 4 is a cross-sectional view of another embodiment of the present invention, FIG. 5 is a cross-sectional view of still another embodiment of the present invention, and FIG. 6 is a cross-sectional view of another embodiment of the present invention.
It is a figure which shows the flow state of the wind obtained by the Example shown in a figure. 1... Blizzard nozzle, 2... Zero drop shooter,
3...Upstream deflector-14...Downstream upper deflector-5, 12...Downstream lower deflector-16a, 6b
...Air cylinder, 7. Jack, 9. Pitot tube, u l diagram

Claims (1)

[Claims] 1. A blizzard nozzle for an artificial snow-making device that is attached to an artificial snow-making device and blows out simulated snow to reproduce an artificial snowstorm; An upstream deflector attached to the upper part, an upper downstream deflector installed downstream of the upstream deflector and protruding from the upper part of the nozzle in the shooter, and an upper downstream deflector attached to protrude from the lower part of the nozzle. Features: A blowing snow nozzle for artificial snowfall equipment.