JP2018115793A - Wet snow making method and device for snowfall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wet snow making method and device capable of attaining desired moisture content in a closed snowfall space, which is limited, regardless of kinds of snow.SOLUTION: A wet snow making method for snowfall includes the steps of: according to allowable variation degree of required moisture content of snow in a closed snowfall space, selecting a mode of controlling only a temperature in the closed snowfall space within a predetermined range, a mode of controlling each of a temperature and a humidity in the closed snowfall space within a predetermined range, or a mode of forming mist in the closed snowfall space with the temperature and humidity in the closed snowfall space controlled within the predetermined range; and making fallen snow wet so as to attain the required moisture content, by the selected control mode.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method and apparatus for wet snow making of snow, and more particularly, wet snow of snow that achieves a desired moisture content in a limited enclosed snow space regardless of the type of snow. The present invention relates to a method and a wet snow making device.

2. Description of the Related Art Conventionally, for example, in snow environment tests for automobiles, wet snow is simulated by making snowfall wet.
Patent Document 1 relates to an artificial snowfall device. The artificial snowfall device has a snowfall chamber, a snow generation chamber at the top of the snowfall chamber, and a snow generation chamber whose lower portion communicates with the snowfall chamber, and generates a part of the air in the snowfall chamber. A bypass air passage for supplying the indoor space is provided, and air is blown out from the bypass air passage toward the snowfall chamber.
According to such an artificial snowfall device, the snow generation chamber is at a temperature below freezing for snow generation, while the snowfall chamber is held so as not to reach a temperature below freezing by an air conditioner or hot air. Ascending air flow from to the snow generating room is blocked by the air blown from the bypass air passage toward the snow generating room, so that snow is generated without any trouble in the snow generating room. Snowing takes place.

Patent Document 2 relates to a method for controlling snow accumulation of artificial snow. An apparatus for performing the snow accumulation control method for artificial snow includes a snowfall device, and air that jets air toward the snow falling from the snowfall device above the snowfall chamber. And controlling the snow accumulation state of the snow in the snowfall chamber by changing the amount of jetting air and the jetting time of the air jetted by the air jetting means, and in particular, the air heated by the heater is jetted by the jet nozzle It is comprised so that it may inject with respect to the snow under snowfall.
According to such an apparatus, the snow surface can be deposited so that the snow surface is substantially flat, and the surface of the snow is melted and moistened by injecting warm air into the snow during the snowfall. Snow can be reproduced.
As described above, any of the artificial snowfall devices can make a certain amount of wet snow during the snowfall for the artificial snow, but has the following technical problems.

That is, conventionally, when snow is made by making artificial snow indoors, a wet snow making technique in which the moisture content of the snow is only achieved has been employed.
First, it is difficult to achieve wet snow having a desired moisture content in a limited indoor snowfall space.
More specifically, in any case, it is not disclosed to manage the sealed snowfall space at a predetermined temperature or a predetermined humidity, and Patent Document 1 discloses that the temperature of the snowfall chamber is higher than the temperature of the snowmaking chamber. It is only disclosed, and if it is only relatively high, for example, it is impossible to achieve wet snowing when the snowfall chamber is below freezing. Also, if the temperature of the snowfall room is higher than 0 ° C, some degree of wet snow can be achieved, but the moisture content of the snow is likely. On the other hand, in Patent Document 2, when the snowfall space is below freezing point, refreezing is caused and wet snow is not formed. In addition, even when the dry bulb temperature is 0 ° C or higher, if the humidity is low and the wet bulb temperature is 0 ° C or lower, wet snow becomes insufficient due to re-freezing caused by evaporation of part of the molten water. . Furthermore, when the mixing time with hot air (aging time) is short, the melting of snow becomes insufficient.

Second, when the desired moisture content of snow is determined by the method of using wet snow, it is difficult to employ an efficient and appropriate wet snow making technique according to the desired moisture content.
More specifically, in any case, it is not disclosed to manage the sealed snowfall space at a predetermined temperature and a predetermined humidity, and the size of the sealed snowfall space, that is, the wettable snow time, and the desired moisture content of the snow are not disclosed. Depending on the rate, the temperature of the sealed snowfall space is kept within a predetermined range, the temperature and humidity of the sealed snowfall space are kept within a predetermined range, or the humidity of the sealed snowfall space is kept within a predetermined range and sealed. Where it is possible to consider whether to generate mist in the snowfall space, such selection is difficult and efficient wet snowing cannot be achieved.

Thirdly, it is difficult to make wet snow selectably against artificial snow or natural snow due to ice particles, crystal snow.
More specifically, in any case, artificial snow is made indoors, and it is snowed in a sealed snowfall space, and then becomes wet snow by the course of the event. However, it is difficult to select wet snow for artificial snow that is made indoors or natural snow indoors according to the purpose of use.

JP-A-2-306075 JP 2008-298331 A

In view of the above technical problems, an object of the present invention is to provide a wet snow making method and a wet snow making device that achieve a desired moisture content in a limited sealed snowfall space regardless of the type of snow. There is.

In order to achieve the above-mentioned problem,
Depending on the allowable variation in the required moisture content of snow in the enclosed snowfall space, only the temperature within the enclosed snowfall space is controlled within a predetermined range, or the temperature and humidity within the enclosed snowfall space are controlled within a predetermined range. Or selecting whether to form mist in the enclosed snowfall space while controlling the temperature and humidity in the enclosed snowfall space within a predetermined range;
According to the selected control mode, the method includes a step of converting the snowfall into wet snow so as to achieve the required water content.

According to the wet snow making method of the present invention having the above-described configuration, only the temperature in the sealed snowfall space is controlled within a predetermined range according to the allowable variation in the required moisture content of the snow in the sealed snowfall space. Select whether to control each temperature and humidity in the enclosed snowfall space within a predetermined range, or to control the temperature and humidity in the enclosed snowfall space within a predetermined range while forming mist in the enclosed snowfall space Therefore, if it becomes wet snow by melting snow during snowfall, the temperature in the sealed snowfall space is too low to be wet, and if the humidity is too low even if the temperature is not too low, While there is a possibility of re-freezing, the melting time may be insufficient depending on the snowfall time given, and even if it can be melted, the moisture content by location in the enclosed snowfall space If variation is likely to occur and if it becomes wet snow by passing the snow through the mist during snowfall, the moisture depending on the location is formed by forming the mist in the entire snowfall space without such temperature and humidity restrictions. It is also possible to reduce the variation in the content rate, and as described above, a desired moisture content can be achieved in a limited sealed snowfall space regardless of the type of snow.

In order to achieve the above-mentioned problem,
Generating a mist of water droplets of a predetermined particle size in air controlled to maintain temperature and / or humidity within a predetermined range;
Passing snowfall through the mist, and
Thereby, it is set as the structure which makes snowfall wet.

Further, it is preferable to adjust the particle diameter of the mist and / or the density of water droplets in the mist according to the time during which the snowfall can be wetted to make the wet snow with a desired moisture content.
Further, the predetermined particle diameter is 5 to 30 microns, and the water droplet density in the mist is preferably 1 to 10 g / m 3.
Furthermore, it is preferable that the space for generating mist has a step of maintaining the humidity higher than the saturation humidity.

In addition, the generation of mist is preferably performed by blowing air and water from the two-fluid nozzle, and is continuously blown during wet snow.
Furthermore, the generation of mist may be performed using a humidified pan.

In order to achieve the above-described problems, the snowfall wet snow making device of the present invention is:
A sealed snowfall space is formed inside by the peripheral side and the top surface that spans the upper peripheral edge of the peripheral side.
The top surface is provided with partitioning means for receiving snow from above and causing snow to fall in the sealed snowfall space,
Temperature adjusting means for adjusting the temperature in the sealed snowfall space;
Humidifying means for humidifying the sealed snowfall space;
A humidifying amount adjusting means for adjusting the humidifying amount so as to keep the humidity in the sealed snowfall space within a predetermined range;
It has composition.
Further, the wet snow making device is portable with a caster, and it is possible to select whether to make wet snow for natural snow outdoors or to make wet snow for artificial snow indoors. Is good.
Further, the partitioning means is a plurality of rollers that are arranged in parallel with each other with their outer peripheral surfaces facing each other at a predetermined interval, and are rotatable in the direction from the top toward the narrowest part between adjacent rollers, In the space above the narrowest portion, having a plurality of rollers arranged so as to be able to receive snowfall,
It is good to snow by pushing down snow, resisting the updraft generated in the sealed snowfall space by the rotation of the plurality of rollers.

In addition, each of the rollers constitutes a rotating brush planted on the outer peripheral surface, and a plurality of through holes are provided on the outer peripheral surface, and air is ejected from the inside of the respective rollers through the through holes. It is good.
Furthermore, each said roller consists of a rubber roller, it has the unevenness | corrugation extended in the axial direction of a roller in the said outer peripheral surface, and the said outer peripheral surface is provided with many through-holes, and air is supplied to each roller. It is good to eject from the inside through the through hole.
Furthermore, below the plurality of rotating brush bodies, there is provided a wind-up wire mesh arranged so as to hit the brush tips of the plurality of rotating brush bodies,
The winding wire mesh is longer than the axial length of the plurality of rotating brush bodies, and is provided to extend from the rotating brush at one end to the rotating brush at the other end of the plurality of rotating brush bodies,
Each rotating brush at both ends has a winding part and can be moved back and forth horizontally. A fixed brush is provided below the winding wire mesh so that the tip of the brush faces upward and hits the lower surface of the winding wire mesh. It is good to be done.

In addition, the humidification amount adjusting means may adjust the humidification amount so as to keep the humidity in the sealed snowfall space within a certain range by changing the amount of fine water droplets to be supplied.
The humidification amount adjusting means further includes a humidity detecting means for detecting the humidity in the sealed snowfall space, and fine water droplets supplied to the sealed snowfall space based on the humidity detected by the humidity detecting means. The amount of humidification may be adjusted by varying the amount.
Still further, the humidification amount adjusting means further includes a temperature detection means for detecting the temperature in the sealed snowfall space, and based on the amount of change per unit time of the temperature detected by the temperature detection means. The amount of humidification may be adjusted by varying the amount of fine water droplets supplied to the snowfall space.

Hereinafter, embodiments of the wet snow making device 100 of the present invention will be described in detail with reference to the drawings.
In a snowfall system used for an environmental test for automobiles, a crystal snow production section is provided in the upper part and a crystal snow snowfall part is provided in the lower part in a space partitioned vertically by partitions extending in the horizontal direction.
The crystal snow production department forms crystal snow by growing frost on the mesh film surface by supplying moist air containing water vapor above ice saturation to the mesh film surface below freezing point. Is a conventionally known type that is physically removed by a scraper or the like, and detailed description thereof is omitted.
A wet snow making device 100 is provided in the crystal snow snow falling part to make wet snow during the snowfall of the crystal snow.

As shown in FIG. 1, the wet snow making device 100 forms a sealed snowfall space 600 inside by a peripheral side surface 602 and a top surface 606 spanning the upper peripheral edge 604 of the peripheral side surface 602, and on the top surface 606, A partitioning means 607 for falling snow in the sealed snowfall space 600 while receiving snowfall from above is provided, a temperature adjusting means 612 for adjusting the temperature in the sealed snowfall space 600, and humidifying the inside of the sealed snowfall space 600. Humidifying means 614 and a humidifying amount adjusting means 616 for adjusting the humidifying amount so as to keep the humidity in the sealed snowfall space 600 within a predetermined range.
The wet snow making device is portable with casters 601, and can select whether to make wet snow for natural snow outdoors or to make wet snow for artificial snow indoors. These temperature adjustment means 612, humidification means 614 and humidification amount adjustment means 616 are made portable by casters 601.

The humidification amount adjusting means 616 adjusts the humidification amount so as to keep the humidity in the sealed snowfall space 600 within a certain range by changing the amount of fine water droplets to be supplied.
As a modification, the humidification amount adjusting unit 616 further includes a humidity detection unit (not shown) for detecting the humidity in the sealed snowfall space 600, and the sealed snowfall space based on the humidity detected by the humidity detection unit. The amount of humidification may be adjusted by varying the amount of fine water droplets supplied to 600.
As a further modification, the humidification amount adjusting unit 616 further includes a temperature detection unit (not shown) for detecting the temperature in the sealed snowfall space 600, and per unit time of the temperature detected by the temperature detection unit. The amount of humidification may be adjusted by varying the amount of fine water droplets supplied to the sealed snowfall space 600 based on the amount of change in the amount of water.
The mist generator constituting the humidifying means 614 and the humidifying amount adjusting means 616 is provided with mist supply ports 630A, B and C constituting the mist injection nozzle on the peripheral side surface 602, and the air conditioner constituting the temperature adjusting means 612 is Similarly, an air outlet 610 and an air inlet 612 are provided on the peripheral side surface 602.

Regarding the formation of mist, the humidity in the sealed snowfall space 600 is detected by a humidity sensor, and the humidification amount in the humidifying means is adjusted so that the inside of the sealed snowfall space 600 is in a predetermined humidity range. To adjust the humidification amount, the rotational speed of the circulation fan that circulates the air in the sealed snowfall space 600, the opening degree of the water supply amount adjustment valve 3 that adjusts the supply amount of humidification water used for humidification, and the temperature of the humidification water are changed. By changing the heating amount of the water heat exchanger, the amount of fine water droplets mixed with the circulating air is changed to adjust the humidification amount.
More specifically, as shown in FIG. 1, a circulation air passage for sucking air in the sealed snowfall space 600 through the air inlet 620 and blowing out air through the air outlet 610, and a ventilation action on the circulation air passage. A circulation fan for performing, a humidifying water jet nozzle for supplying water to the circulation fan, a ventilation fan for sucking the air in the sealed snowfall space 600 and exhausting it outside through the exhaust duct, and heating the humidified water supplied to the humidifying water jet nozzle Water heat exchanger, solenoid valve that intermittently supplies humidified water to the humidifying water ejection nozzle, water supply adjustment valve to adjust the amount of humidified water ejected, humidity to detect the humidity of the air passing through the circulation air passage A sensor, a suction temperature sensor for detecting the temperature of the air in the sealed snowfall space 600 sucked from the intake port 620, a blowout temperature sensor for detecting the temperature of the air blown from the blowout port 610, and the like. .

The humidity sensor is provided in the vicinity of the intake port 620 of the circulation air path, and detects the humidity of the air sucked from the intake port 620. Further, the temperature of the air in the sealed snowfall space 600 and the temperature of the humidified air to be blown are detected by a suction temperature sensor provided in the vicinity of the intake port 620 and a blowout temperature sensor provided in the vicinity of the blowout port 610. Based on the preset suction humidity, suction temperature, and blowout temperature, the circulation air volume by the circulation fan, the supply amount and supply water temperature of the humidification water ejected from the humidification water ejection nozzle are determined, and the rotation speed of the circulation fan and the water supply The amount of humidification is adjusted by changing the opening of the amount adjustment valve and the amount of heating in the water heat exchanger. When increasing the amount of humidification, increase the number of rotations of the circulation fan, open the opening of the water supply adjustment valve, and increase the amount of heating in the water heat exchanger to increase the amount of fine water droplets supplied into the sealed snowfall space 600. The supply amount can be increased, and the humidification amount can be increased. Conversely, when reducing the amount of humidification, the rotational speed of the circulation fan is reduced, the opening of the water supply amount adjustment valve is closed, and the heating amount in the water heat exchanger is reduced, so that the fine amount supplied into the sealed snowfall space 600 is reduced. The supply amount of water droplets can be reduced, and the humidification amount can be reduced. It is possible to form an optimal mist state by determining the combination of the operating state of the circulation fan, water supply amount adjustment valve, and water heat exchanger based on the suction temperature and the suction temperature detected by the suction temperature sensor and the blowout temperature sensor. It becomes.
As long as it is possible to uniformly generate mist throughout the enclosed snowfall space, the mist generation method may be a conventionally known technique, for example, a method using a two-fluid nozzle that sprays water together with compressed air, For example, by applying high-frequency AC voltage to a piezoelectric ceramic vibrator, the ultrasonic vibration energy is transmitted to the water surface, and ultrasonic waves that generate fine mist from the water surface are used. Any of a method using a humidifying pan performed by a heater and a method of directly spraying steam can be employed.
In this case, a plurality of mist spray nozzles may be installed on the peripheral side surface (630A, B and C) (FIG. 1), or may be installed obliquely downward over the entire periphery 604 of the top surface 606 (FIG. 5). In the case of FIG. 5, mist formation by a two-fluid nozzle or vapor spraying is suitable. More specifically, a plurality of mist spray nozzles 650 are provided over the entire periphery 604 of the top surface 606 at intervals in the longitudinal direction of a supply pipe 640 connected to a fluid or vapor source (not shown). It is installed diagonally downward so that the mist is supplied over the entire snowfall space 600.

Next, the partition extending in the horizontal direction will be described. As shown in FIGS. 2 and 3, the plurality of rollers 306 are arranged above the sealed snowfall space 600 so as to partition the sealed snowfall space 600, respectively. The roller 306 constitutes a rotating brush 314 planted on the outer peripheral surface 312, and a plurality of through holes 316 are provided on the outer peripheral surface 312 so that air is ejected from the inside of each roller 306 through the through holes 316. I have to.
As a modified example, a plurality of depressions are provided in the dimple shape of the golf ball over the entire outer peripheral surface of one of the adjacent rotating brushes 314, so that, as will be described later, the roller 306 adjacent to the crystal snow that has been made into snowflakes is adjacent. When passing through the narrowest part, it is possible to maintain the crystal state of crystal snow that is easily broken. The width and depth of the plurality of recesses may be determined from such a viewpoint.
The rotating brush 314 is made of, for example, a resin-made flexible material, and the tip of the rotating brush 314 may have a length that makes contact with the outer peripheral surface 312 of the opposing roller 306. The diameter of the rotating brush 314 and the rotating brush The density on the outer peripheral surface 312 of the roller 306 of 314 may be appropriately determined from the viewpoint of the area where snow particles can adhere to the outer peripheral surface 312 of the roller 306 excluding the rotating brush 314.
The air may be ejected in a pulsed manner, and even if the temperature in the sealed snowfall space 600 is 0 ° C. or higher by setting the temperature of the air to be cold air of −1 ° C. or less, this atmosphere is maintained in the rotating brush 314. In addition, it is possible to prevent the generated snowflakes from melting by avoiding direct contact with the roller 306. The density of the air through holes 316 may be determined from such a viewpoint. The air volume may be determined from the viewpoint of not breaking the crystal snow crystals.

In the case of the roller 306 with the rotating brush 314, since the attached snow particles are not consolidated, the crystal snow is separated from the roller 306 by the rotating brush 314, which is suitable for simulating snowfall. Thus, by setting the length to the outer peripheral surface 312 of the opposing roller 306, the roller 306 can be arranged in the horizontal direction so that the inside of the sealed snowfall space 600 can be partitioned. The snow-making space and the snow-falling space are temperature regions that are independent from each other, for example, the upper space of the sealed snow-falling space 600 is used as a snow-making space with a lower space, while the lower space of the sealed snow-falling space 600 is used as the snow-falling space. Snowfall when simulating snowfall using snowflakes that have been created and generated Pace as above zero, it is possible to wet snow into during snowfall.

Under the rotating brush 314 group that generates snowflakes, a winding type wire net 500 is provided so as to be in contact with the tip of the rotating brush 314 group.
Even with the rotating brushes 314 group, a large lump of snow may fall as it is, and the take-up type wire mesh 500 is provided in order to prevent such large snowflakes from falling as they are. Optionally, the mesh size is smaller than the size of the large block of snowflakes, for example, 5 to 8 mm, from the viewpoint that the large block of snowflakes does not snow as it is.
The winding wire mesh 500 has a width longer than the axial length of the rotating brush 314 group, and is provided so as to extend from the rotating brush 314 at one end of the rotating brush 314 group to the rotating brush 314 at the other end. Since the length of the brush provided on the rotating brush 314 from the center of the rotating brush 314 is uniform, the winding wire mesh 500 is installed substantially horizontally.

The winding-type wire mesh 500 has a winding portion 502 on each of the rotating brushes 314 at both ends, and a known rotating motor 506 is provided on either of them, and can be reciprocated horizontally by the rotation of the rotating motor 506. .
The winding wire mesh 500 needs to be reciprocated horizontally during the generation of snowflakes during the rotation of the rotating brush 314 group. The horizontal moving speed of the winding wire mesh 500 is determined by the rotation of the rotating brush 314. Although it may be set according to the speed, it is set lower than the peripheral speed of the brush tip of the rotating brush 314. Thus, the time until the snow falls after passing through the mesh of the winding wire mesh 500 in which the snowflake is moving in the horizontal direction is ensured.

A fixed brush 504 is provided below the wind-up wire mesh 500 so that the tip of the brush faces upward and hits the lower surface 510 of the wind-up wire mesh 500. A plurality of fixed brushes 504 are provided, and each fixed brush 504 is preferably provided below a position where the brushes of adjacent rotating brushes 314 of the rotating brush 314 group mesh with each other, that is, below a position where snowflakes are generated. As a result, snowflakes adhering to the lower surface 510 of the wind-up type wire net 500 are scraped off by the fixed brush 504 so that the snow falls reliably.

According to the above configuration, the snowflake is guided downward by the rotating brush 314 during the rotation of the rotating brush 314 group, so that the upper surface 508 of the winding wire mesh 500 moving in the horizontal direction is received and wound. When the take-up type wire mesh 500 hits the brush tip of the rotary brush 314 group, the crystal snow that has become a large piece of snow is repelled in the vertical direction, whereby the snowflake on the upper surface 508 of the take-up type wire mesh 500 is shredded and taken up. Snow can pass through the mesh of the metal mesh 500. At that time, snowflakes adhering to the lower surface 510 of the wind-up type wire mesh 500 are scraped off by the fixed brush 504 so that the snow falls reliably.
When the winding wire mesh 500 is wound around one of the rotating brushes 314 at both ends during the horizontal movement, the winding wire mesh 500 is moved horizontally by reversing the rotation direction of the rotating motor 502. What is necessary is just to move to a direction reverse direction, and what is necessary is just to reciprocate the winding-type metal-mesh 500 in a horizontal direction in this way.
As described above, in the case where the take-up type wire mesh 50 is provided below the rotary brush 314 group that generates the snowflakes, so that the take-up type wire mesh 50 is disposed so as to contact the tip of the rotary brush 314 group. Compared to the above, according to the mesh of the winding wire mesh 500, it is possible to cooperate with the rotary brush 314 group and the winding wire mesh 500 to achieve a more partitioned function.

About the wet snow making apparatus 100 which has the above structure, the effect | action is demonstrated below with the wet snow making method.
First, a snowfall space is prepared by a wet snow making device and a temperature / humidity adjusting device. More specifically, the ambient temperature and humidity in the snowfall space are set to a predetermined value, and the plurality of rollers 306 are continuously rotated, and a mist composed of water droplets having a predetermined particle diameter is set to a predetermined temperature and / or humidity. It is generated in the air in the enclosed snowfall space 600 managed to be maintained within the range.
It is preferable to adjust the mist particle size and / or the density of water droplets in the mist according to the time when the snowfall can be wetted, so that the desired moisture content is moistened with snow. It is 30 microns, and the water droplet density in the mist is 1 to 10 g / m 3.
The space for generating the mist may have a step of maintaining the saturation humidity or higher.
The generation of mist may be performed by blowing air and water from a two-fluid nozzle, and the blowing may be performed continuously during wet snowing, and the generation of mist may be performed using a humidifying pan.

Next, in the upper part of the space divided vertically by a partition extending in the horizontal direction, frost-like crystal snow is generated on the outer surface of the mesh-like film body with humid air containing water vapor above ice saturation below the freezing point. Drop off the crystal snow.
The crystal snow is received in the space above the narrowest part between the adjacent rollers 306, becomes a large piece of snow, and the adjacent roller 306 rotates toward the narrowest part between the adjacent rollers 306. The crystal snow that has become a heavy snowflake passes through the narrowest part and is guided downward. At that time, the crystal snow that has become a large snowflake is repelled by the tip of the rotating brush 314 and is converted into a large snowflake without breaking the crystal itself. The crystal snow is made into small snowflakes.
At the same time, in the narrowest part between the adjacent rollers 306, each other's brushes overlap to form a partition, so that the lower space is used to wet the crystal snow during the snowfall in the lower part of the space. By increasing the temperature, it is possible to prevent the updraft from reaching the upper part of the space, so that the snowfall is not hindered by the updraft and the crystal growth is not hindered in the snowmaking section. Therefore, by allowing the snowfall to pass through the mist, it is possible to make the crystal snow wet during the snowfall while preventing the formation of large snow pieces.

At that time, every other adjacent roller 306 is sent out downward, and the snowflake is sent down by the rotation of the roller 306, falls down as it is, simulates snowfall, Snow is deposited on the upper part of the vehicle V which is a test body.

In the narrowest portion 304, the upper space and the lower space of the sealed snowfall space 600 are substantially partitioned by a plurality of rollers 306, and in the short term, the crystal snowfall from the crystal snowfall portion. Suppressing the rising airflow to the snow part prevents the snowfall in the crystal snowfall part from being obstructed, and in the long term, the temperature in the crystal snowfall part and the temperature in the crystal snowmaking part become uniform. As a result, it is also possible to prevent the temperature in the crystal snow falling part from decreasing and preventing the wet snow from being disturbed in the crystal snow falling part.

According to the wet snow making method of the present invention having the above-described configuration, only the temperature in the sealed snowfall space is controlled within a predetermined range according to the allowable variation in the required moisture content of the snow in the sealed snowfall space. Select whether to control each temperature and humidity in the enclosed snowfall space within a predetermined range, or to control the temperature and humidity in the enclosed snowfall space within a predetermined range while forming mist in the enclosed snowfall space Therefore, if it becomes wet snow by melting snow during snowfall, the temperature in the sealed snowfall space is too low to be wet, and if the humidity is too low even if the temperature is not too low, While there is a possibility of re-freezing, the melting time may be insufficient depending on the snowfall time given, and even if it can be melted, the moisture content by location in the enclosed snowfall space If variation is likely to occur and if it becomes wet snow by passing the snow through the mist during snowfall, the moisture depending on the location is formed by forming the mist in the entire snowfall space without such temperature and humidity restrictions. It is also possible to reduce the variation in the content rate, and as described above, a desired moisture content can be achieved in a limited sealed snowfall space regardless of the type of snow.
As shown in FIG. 4, when wet snow is formed outdoors during natural snowfall as shown in FIG. 4, the wet snow making apparatus 100 itself is carried out outdoors and the natural snow is received by a plurality of rollers 306. The wet snow may be formed in the sealed snowfall space 600. In this case, the moisture content may be adjusted by adjusting the wet snow making device 100 according to the wetness of the natural snow itself.

The embodiments of the present invention have been described in detail above, but various modifications or changes can be made by those skilled in the art without departing from the scope of the present invention.
For example, in the present embodiment, as an aspect for achieving partitioning and small snowflakes, in the present embodiment, the winding type wire mesh arranged so as to hit the brush tip of the rotating brush 314 group has been described, but the present invention is not limited thereto. Instead, the snowflakes on the upper surface 508 of the winding wire mesh 500 may be made into small snowflakes by applying vibration with a fixed type instead of being movable like the winding wire mesh.

1 is a schematic perspective view showing an embodiment of a crystal snow moistening device 100 according to the present invention. The schematic sectional drawing which shows the detail of a partition in embodiment of the wet snow making apparatus 100 of the crystalline snow which concerns on this invention. Schematic which shows the detail of a rotary brush in embodiment of the wet snow making apparatus 100 of the crystalline snow which concerns on this invention. In the embodiment of the crystal snow moistening device 100 according to the present invention, FIG. 1 is a view similar to FIG. The schematic perspective view similar to FIG. 1 which shows the modification of the wet snow making apparatus 100 of the crystal snow based on this invention.

DESCRIPTION OF SYMBOLS 100 Moisture snow device 306 Roller 308 Test chamber 310 Concavity and convexity 314 Rotating brush 316 Through-hole 500 Winding type wire mesh 502 Winding portion 504 Fixed brush 506 Rotating motor 508 Upper surface 510 Lower surface 600 Sealed snowfall space 601 Caster 602 Peripheral side surface 604 Upper edge 606 Top surface 610 Air outlet 620 Air inlet 630 Mist supply port 640 Supply pipe 650 Mist spray nozzle

Claims (16)

Depending on the allowable variation in the required moisture content of snow in the enclosed snowfall space, only the temperature within the enclosed snowfall space is controlled within a predetermined range, or the temperature and humidity within the enclosed snowfall space are controlled within a predetermined range. Or selecting whether to form mist in the enclosed snowfall space while controlling the temperature and humidity in the enclosed snowfall space within a predetermined range;
A method of moistening snowfall, comprising the step of moistening the snowfall so as to achieve the required water content according to the selected control mode. Generating a mist of water droplets of a predetermined particle size in air controlled to maintain temperature and / or humidity within a predetermined range;
Passing snowfall through the mist, and
Thus, a method of making snowfall wet, which comprises converting the snowfall into wet snow. The wet snow of the snowfall according to claim 2, wherein the particle size of the mist and / or the density of water droplets in the mist is adjusted in accordance with the possible time of the snowfall to make the snow wet, and the snow is wetted with a desired water content. Method. The method according to claim 2, wherein the predetermined particle diameter is 5 to 30 microns, and a water droplet density in the mist is 1 to 10 g / m3. The method according to claim 2, wherein the space for generating the mist has a step of maintaining the space above the saturation humidity. The mist generation is performed by blowing out air and water from a two-fluid nozzle, and the blowing out is performed continuously during wet snowing. The method for producing snow from wet snow according to claim 2, wherein the generation of mist is performed using a humidifying pan. A sealed snowfall space is formed inside by the peripheral side and the top surface that spans the upper peripheral edge of the peripheral side.
The top surface is provided with partitioning means for receiving snow from above and causing snow to fall in the sealed snowfall space,
Temperature adjusting means for adjusting the temperature in the sealed snowfall space;
Humidifying means for humidifying the sealed snowfall space;
A humidifying amount adjusting means for adjusting the humidifying amount so as to keep the humidity in the sealed snowfall space within a predetermined range;
A wet snow making device characterized by comprising: The wet snow making device is portable with a caster, and can select whether to make wet snow for natural snow outdoors or to make wet snow for artificial snow indoors. 8. The wet snow making apparatus according to 8. The partitioning means is a plurality of rollers which are arranged in parallel with each other with their outer peripheral surfaces facing each other at a predetermined interval and are rotatable from above toward the narrowest part between adjacent rollers. In the space above the narrow part, having a plurality of rollers arranged to receive snowfall,
The wet snow making device according to claim 8 or 9, wherein the plurality of rollers rotate to snow by pushing down snow while resisting an upward air flow generated in the sealed snowfall space. Each of the rollers constitutes a rotating brush planted on the outer peripheral surface, and a plurality of through holes are provided on the outer peripheral surface, and air is ejected from the inside of each roller through the through holes. The wet snow making device according to 10. Each of the rollers is a rubber roller, and the outer peripheral surface has irregularities extending in the axial direction of the roller. The outer peripheral surface is provided with a plurality of through holes, and air is supplied to the inside of each roller. The wet snow making device according to claim 10, which is ejected through the through hole. Below the plurality of rotating brush bodies, a winding type wire mesh is provided so as to be in contact with the brush tips of the plurality of rotating brush bodies,
The winding wire mesh is longer than the axial length of the plurality of rotating brush bodies, and is provided to extend from the rotating brush at one end to the rotating brush at the other end of the plurality of rotating brush bodies,
Each rotating brush at both ends has a winding part and can be moved back and forth horizontally. A fixed brush is provided below the winding wire mesh so that the tip of the brush faces upward and hits the lower surface of the winding wire mesh. The wet snow making device according to claim 11. The humidification amount adjusting unit according to claim 8 or 9, wherein the humidification amount adjusting means adjusts the humidification amount so as to keep the humidity in the sealed snowfall space within a certain range by changing an amount of fine water droplets to be supplied. Wet snow making device. The humidification amount adjusting means further includes a humidity detection means for detecting the humidity in the sealed snowfall space, and controls the amount of fine water droplets supplied to the sealed snowfall space based on the humidity detected by the humidity detection means. The wet snow making device according to claim 14, wherein the humidification amount is adjusted by making the variable. The humidification amount adjusting means further includes a temperature detecting means for detecting a temperature in the sealed snowfall space, and the humidified amount adjusting means is provided in the sealed snowfall space based on a change amount of the temperature detected by the temperature detecting means per unit time. The wet snow making device according to claim 14, wherein the humidification amount is adjusted by changing the amount of fine water droplets to be supplied.

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