JP2913674B2 - Artificial snowfall equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an artificial snowfall device.

[Prior Art] As a conventional artificial snowfall device, a water supply header having a large number of water injection nozzles is disposed above a test chamber where the room is maintained at a temperature below freezing, and a net screen is provided below the water supply header. Is provided, and a brush body for scraping off the ice on the net screen surface as ice chips is movably provided, and mist of water spouted from the nozzle adheres to the net screen and stays there, and during this stay, Japanese Patent Application Laid-Open No. 58-75678 discloses a method in which ice that is frozen on a net screen, and the ice formed on the net screen is rubbed by a brush body to become ice chips, removed from the net screen, and artificially falls as artificial snow. It has been proposed as a gazette.

[Problems to be Solved by the Invention] In the above-described prior art, in which fog sprayed from a nozzle is frozen to cause snow to fall, a downdraft of cool air is generated in the room, and the interior of the room can be seen through so that the showroom can be seen through. When it is formed, there is a problem that the inside is fogged by cold air staying due to the downdraft and cannot be visually recognized.

Japanese Patent Application Laid-Open No. 63-140270 discloses a pneumatic device for adjusting the flow rate of air in the inner cylinder by providing a snow passage device (31) and a seeding device (32) connected to an upright cylinder (30). A flow-side adjusting air path pipe (33) is provided, and a cooling device (35) is provided in an outer tank (34) for cooling the inner cylinder (30), and the snow generated in the inner cylinder (30) is opened (46). ) Discloses an artificial snowfall device in which snow falls in the snowfall room (54), in which a circulation fan (63) is provided in the snowfall room (54).

However, even with this artificial snowfall device, when the generated snow and ice crystals descend from the opening (46), a downdraft of cool air is generated in the snowfall chamber (54), and the interior of the snowfall chamber 54 becomes cloudy and visible. There is a problem of disappearing. This problem is remarkable especially when the temperature in the snowfall room (54) is higher than that in the inner cylinder (30).

Therefore, an object of the present invention is to provide an artificial snowfall device that suppresses a downdraft airflow from a snow production chamber and allows the snowfall state to be visually recognized well.

Means for Solving the Problems The artificial snowfall device of the present invention includes a snow-generating chamber above a snow-falling chamber, and a flat screen having a number of holes below the snow-generating chamber. In an artificial snowfall device for dropping snow generated from holes, an air blowing means for blowing air horizontally or downward toward the lower surface of the flat screen is provided at the upper part of the snowfall chamber, and The structure is such that the downdraft from the snow production chamber is blocked by blowing air.

[Operation] With the above configuration, the air from the blowing means is blown horizontally to the lower surface of the screen where the snow falls, or toward the lower surface of the screen. In this case, the cool air is prevented from descending, and fogging when the snowfall room is a showroom is prevented. In addition, snow falling from the snow generation chamber gradually falls due to the blowing from the blowing means.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 to 8, a snow generating chamber 2 is provided in communication with an upper part of a showroom 1 which is a snowfall room, and a flat screen 4 having a large number of holes 3 in the lower part of the snow generating chamber 2.
A jet nozzle 5 for combining and jetting gas and water is provided above the screen 4, and a low-temperature mist holding chamber 6 is provided in the jet direction of the jet nozzle 5,
An impact device 7 is provided to drop snow generated on the screen 4 by applying an impact to the screen 4.

The snow generating chamber 2 is provided with a cooler 8 at the upper part and the front and rear side parts, and the cooler 8 allows the cooler 8 to have a temperature of -5 ° C to -15 ° C, preferably
It is kept cool at about 10 ℃. On one side of the snow generation chamber 2, the injection nozzle 5 is provided obliquely upward, and first and second temperature sensors 9 and 10 are provided. Further, a screen 4 is provided at a lower portion of the snow generating chamber 2, and seats 11 are stretched on left and right sides of the screen 4.

The injection nozzle 5 is a two-fluid fine spray nozzle that merges and injects gas and water, and has an inlet 12 for compressed air on one side, and the inlet 12 has a hole 13 formed in the nozzle periphery. A water inlet 15 is provided on the other side, and the inlet 15 communicates with the outlet 14 through a hole 16 formed at the center of the nozzle, and compressed air and water are communicated with each other. It merges at the injection port 14 and ejects. A needle valve 17 is provided in the hole 16 at the center of the nozzle.
Can remove ice adhering to the injection port 14 through the injection port 14. A heater (not shown) is mounted on the outer peripheral surface of the injection port 14. And a water supply source (not shown)
Water intermittently circulates in the water cooler 20, is cooled to a predetermined temperature of 2 ° C. to 10 ° C., preferably to about 4 ° C., passes through a water strainer 21, and is then pumped by a pressure pump 22. 1.0 to the inlet 15 of the injection nozzle 5 through the check valve 23
It is pumped at a pressure of about 2.0 kg / cm ² (solid arrow in FIG. 1).
On the other hand, the compressed air discharged from the compressor 24 has its water removed by the air dryer 25 and the tank 26, the valve 27, the pressure reducing valve 28,
2.0-3.0 through the second check valve 29 to the inlet 12 of the injection nozzle 5.
Pumping at a pressure of about kg / cm ² (dotted arrow in Fig. 1). In this case, a part of the water discharged from the pressure pump 22 is returned to the water tank 19. A freezing prevention solenoid valve 30 is connected to the injection nozzle 5 side of the first and second check valves 23 and 29 via a conduit 31, and the solenoid valve 30 connects the conduit 31. When the pressure pump 22 is stopped, the compressed air is pressure-fed to the water inlet 15 of the injection nozzle 5 via the pipe line 31 to fill the air in the pipe in the snow production chamber 2 to prevent freezing (first). (Dashed line arrow in the figure). In addition, a third temperature sensor (not shown) is provided in the water supply line.

The mist sprayed from the spray nozzle 5 is preferably set to spread at a narrow angle. For example, when the air pressure is 2.8 kg / cm ² and the water pressure is 2.0 kg / cm ² , the spray ports 14 to 15c in FIG.
The horizontal width A at the point m is about 13cm, and the horizontal width B at the point 23cm is 17c.
It is preferable that the horizontal width C at a point of about 38 m and 38 cm is about 22 cm, and the spray length D of the fog is about 3.4 m. In addition, the injection nozzle 5 injects upward to prolong the mist residence time in the low-temperature residence space 6 and promote freezing. As the sprayed mist spreads at a narrow angle, the spray length D
Can be reliably frozen before reaching the screen 4, and when spread at a wide angle, the jet length D is shortened, so that it is easy to reach the screen 4 with water, and conversely, when the angle is too narrow, it is sufficient. Similarly, it is easy to reach the screen 4 with water without being cooled. In order to freeze water at 0 ° C. higher than the temperature in the snow generating chamber 2, 80 cal per gram is required, so that effective spraying is required. By narrowing the angle of the mist spray, an energy saving effect can be obtained. Also, as the water pressure is increased or the air pressure is decreased at the same nozzle, the amount of icing can be increased.
Further, a plurality of injection nozzles 5 may be provided,
May be provided on the left and right sides and may be ejected from both the left and right sides, or may be provided above and ejected downward.

The screen 4 has a showroom 1 in the lower part of the snow production room 2.
Are provided horizontally in a pair with respect to the front-rear direction, and have a plate-like shape formed by extending an expanded metal 33 on a metal frame 32. The size of the hole 3 of the expanded metal 33 preferably has a 100mm ² ~4900mm ² about an area, for example, short-time direction center-to-center distance l1 hole 3 as in FIG. 4 is about 12～22Mm, the hole 3 Longitudinal center-to-center distance
12 is about 30.5 to 50.8 mm. If the hole 3 is too large, ice will pass through the hole 3 without growing, and if too small, clogging will occur. Further, the screen 4 is supported in a seesaw shape by a support shaft 34 so that one end portion on the center side of the snow generation chamber 2 is provided with a downward one-way rotational force. This rotational force is provided by displacing the support shaft 34 from the position of the support shaft 34 to the other end side and by providing a weight 35 at one end portion. Locked and held at 37. On the other side of the screen 4, a motor 38 is provided.
An arm 40 is fixed to the output shaft 39 whose gear has been reduced by 38, and a roller 41 is rotatably supported at the tip of the arm 40. A roller is provided near the motor 38 when the arm 40 rotates.
The base end of the hammer arm 42 that moves up and down by engaging with 41
The bracket 43 supports the bracket 44. A hammer 45 for hitting the screen 4 is provided at the tip of the hammer arm 42. Then, two impacts are applied to the screen 4 while the output shaft 39 of the motor 38 and the arm 40 make one rotation counterclockwise in FIG. First, a roller 41 is provided at the other end of the screen 4 at an impact receiving portion.
46 When moving downward from the upper position, the other end of the screen 4 is pushed downward against the rotational force in one direction of the screen 4 to incline in the opposite direction as shown by a dashed line in FIG. When the engagement between the 41 and the impact receiving portion 46 is disengaged, the screen 4 is returned by the one-way rotational force, and the first impact is mainly applied to one side from the support shaft 43 by the engagement with the cushion rubber 37. . Next, when the roller 41 reaches the upper position, the roller 41 is protruded from the side of the hammer arm 42.
And pushes up the hammer arm 42, and the engagement is released with the movement of the roller 41, and the hammer arm 42 falls by its own weight and strikes the impact receiving portion 46 of the screen 4 to mainly apply the support shaft of the screen 4. Impact from 43 to the other side. Thus, the impact is applied twice to the screen 4 for each rotation of the output shaft 39, and the output shaft 39 rotates about once every two seconds. By changing the rotation speed of the output shaft 39, the impact cycle varies. In this case, the hammer 45 is provided with a soundproof rubber 48.

The showroom 1 is provided with a see-through plate 49 made of transparent glass or the like on the front so that a snowfall state can be visually recognized. In addition, a display panel 50 such as a landscape
Is provided. In addition, there is a display panel in Cho Room 1.
A cooler 52 is provided on a rear surface of the 50 via a cutting plate 51, and a blower fan 53 as a blower is provided above the cooler 52 so as to blow air in a horizontal direction. And cooler 52
The air cooled by the blower blows the lower portion of the flat screen 4 horizontally by the blower fan 53 as shown by the arrow in FIG. 2, thereby suppressing the downward airflow from the snow production chamber 2,
In addition, it circulates and returns from the opening 54 below the partition plate 51 via the filter 55.

Also, the compressed air is intermittently injected into the injection port 14 of the injection nozzle 5 and the coolers 8 and 52 to prevent the injection port 14 from freezing,
In addition, the frost of the coolers 8, 52 is removed.

 Next, the operation of the above configuration will be described.

An operation panel (not shown) includes an operation lamp, a power lamp, a monitor lamp for displaying an error, a start switch, a stop switch, an automatic / manual switch, an antifreeze switch,
A switch for snowfall (start of impact) is provided.
As shown in the time chart of the figure, when the start switch is first pressed, the coolers 8, 52 and the water cooler 20 operate, whereby the inside of the snow generating room 2 and the inside of the show room 1 are cooled. The compressor 24, the anti-freezing solenoid valve 30, and the impact device 7, which detect that the room temperature has reached 5 ° C. by the first temperature sensor 9, operate to fill the piping in the snow generating chamber 2 with air to prevent freezing. Further, when the second temperature sensor 10 detects that the room temperature has reached -5 ° C., the anti-freezing solenoid valve 30 returns, shuts off the pipe line 31, and operates the pressure feed pump 22 to release compressed air from the injection nozzle 5. Water merges and jets. As a result, snow is generated in the snow generation room 2 and snow falls in the showroom 1. When the stop switch is pressed, an antifreezing operation is performed in the same manner as described above, and when it is detected that the room temperature has reached 5 ° C., all operations are stopped.

The mist sprayed from the spray nozzle 5 toward the wide low-temperature stagnant air 6 freezes and adheres to the screen 4 and grows before falling on the screen 4. The snow generated on the screen 4 in this way falls almost entirely from the screen 4 by the impact of the screen 4 and falls. In the case of the present embodiment, the air cooled by the blower fan 53 is blown horizontally along the lower surface of the screen 4, so that the downdraft due to the cool air from the snow generation chamber 2 is cut off by this blow, and the downdraft Can prevent clouding of the shawl 1 and the snow falling from the screen 4 falls quietly, giving a more natural feeling.

As described above, in the present embodiment, the blower fan 53 is provided in the upper part of the showroom 1, and the air cooled by the cooler 52 is blown in the horizontal direction along the lower surface of the screen 4 by the blower fan 53. The temperature of the lower part of the screen 4 becomes lower than the room temperature of the snow generating chamber 2 to generate an updraft. For this reason, the downdraft from the snow generating chamber 2 can be blocked, and the cloudiness in the showroom 1 due to the downdraft can be prevented, and a gentle snowfall state can be obtained. can do.

10 and 11 show another embodiment of the present invention. The same parts as those in the above embodiment are denoted by the same reference numerals, and the description of the same parts is omitted. FIG. 11 shows a case where air is obliquely blown toward the lower surface of the screen 4, and FIG. 11 shows a case where air is blown obliquely toward the lower surface of the screen 4 by the blower fan 57. The descending airflow can be shut off by the upward air pressure, thereby preventing fogging and gentle snowfall in the showroom 1 as in the above embodiment.

As another embodiment, the nozzle 56 or the blower fan 57 may be provided so as to blow air horizontally to the lower surface of the screen 4 except for the cooler 8.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, this embodiment is suitable for ornamental use, but may be applied for cooling various articles.

[Effect of the Invention] In an artificial snowfall apparatus provided with a snow generation chamber above a snowfall room, a blowing means for blowing air horizontally to the lower surface of the flat screen or toward the lower surface of the screen is provided above the snowfall room. The artificial snowfall device can be provided, wherein the downdraft from the snow generating chamber is blocked by the blowing from the blowing means, whereby the downdraft from the snow generating chamber is suppressed and the snowfall state can be visually recognized well.

[Brief description of the drawings]

1 to 9 show an embodiment of the present invention. FIG. 1 is a schematic explanatory view of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 4 is an enlarged sectional view of a main part of FIG. 3, FIG. 5 is an explanatory view showing an ejection state of the ejection nozzle, FIG. 6 is an enlarged sectional view of the ejection nozzle, FIG. FIG. 8 is a cross-sectional view showing the screen and the impact device, FIG. 8 is an enlarged cross-sectional view taken along the line CC of FIG. 7, FIG.
10 and 11 are cross-sectional views showing another embodiment of the present invention. 1 ... showroom (snowfall room) 2 ... snow generation room 3 ... hole 4 ... screen 53 ... blower fan (blower means) 56 ... nozzle (blower means) 57 ... blower fan (blower means)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F25C 3/04 F25C 3/00

Claims (1)

(57) [Claims] 1. An artificial snowfall apparatus comprising a snow-generating chamber above a snow-falling chamber, a flat screen having a number of holes below the snow-generating chamber, and falling snow generated from the holes of the screen. In the upper part of the snowfall chamber, a blowing means for blowing air in a horizontal direction or toward the lower surface of the screen is provided on a lower surface of the flat screen, and a downward airflow from the snow generating chamber is blocked by the blowing from the blowing means. An artificial snowfall device having a configuration.