JP6730653B2 - Crystal snowfall system - Google Patents

Description

The present invention relates to a snowfall system for crystal snow, and more particularly to a snowfall system for crystal snow capable of moistening the crystal snow during snowfall while preventing heavy snowflakes.

2. Description of the Related Art Conventionally, an environment test room has been used for placing a completed model vehicle in a room, setting various natural environment and meteorological conditions, and collecting and analyzing the load on the vehicle as data.
As one example, artificial snow is used in an environmental test room to deal with problems such as troubles due to mixing of snow into the engine room and icing problems such as freezing of underbody parts.

Therefore, a vehicle, a snowmaking section, and a snowfall section are provided in the environmental test chamber.
An example is disclosed in Patent Document 1.
In Patent Document 1, the snow-making part freezes fine water droplets sprayed in the form of mist in a low temperature space, captures frozen ice particles in a film of a carrier, and the ice particles adhere and grow on the surface of the carrier. Then, the snowfall portion is configured so that the snowflakes that have adhered and grown are peeled off from the surface of the carrier by an impact and fall, and cause the vehicle to snowfall in the test room.
Ice particles can be transported by, for example, compressed air, and it is possible to transport the ice particles into the environmental test chamber by, for example, making snow outside the environmental test chamber without providing a snowmaking section in the environmental test chamber. Yes, it is possible to avoid that the snowmaking part is affected by the temperature and humidity conditions of the snowfall part in the environmental test room, but on the other hand, artificial snow due to ice particles is hard to say that it is a simulation of crystalline natural snow. Depending on the content of the test, it may not be appropriate to use artificial snow with ice particles.

In this respect, Patent Document 2 discloses a technique for snowfall using crystalline artificial snow instead of artificial snow caused by ice particles.
More specifically, in Patent Document 2, the snow-making part includes a rotary air-permeable membrane including an endless mesh-like film body between an upper roller and a lower roller, at least one of which can be rotationally driven. The apparatus has a device, and a snow-dried snow body in the vicinity of the lower roller, the tip edge of which is separated from the outer surface of the mesh-shaped film body. By passing humidified air through the mesh-shaped film body, the mesh-shaped film is formed. During rotation of the body, frost that simulates dendritic crystal snow on the surface of the mesh-like film body is allowed to grow, and in the snowfall part, the frost that has grown drops off by the crystal snow falling body, causing the vehicle to snow in the test room. Is configured.
When such a dendrite snow is simulated, it is possible to conduct an environmental test in a state closer to natural snow.

However, such a snowfall device for crystal artificial snow has the following technical problems.
First, the generated crystal snow may be fragmented when it falls.
More specifically, depending on the rotation speed of the rotary air-permeable membrane device and the distance between the outer surface of the mesh-like membrane and the tip edge of the snowflakes falling off, the snowflakes fall off when the snowflakes fall off. It may be blocked by a falling body and fall off in the state of heavy snow flakes.
Further, the frost that has grown is only captured by the mesh-shaped film body as a matter of course and grows, so that it is difficult to adjust the size of the snowflakes that adhere and grow.
In this regard, recently, the test conditions of the environmental test targeting the vehicle have been varied, and the natural snowfall mode is simply simulated to the vehicle without making a large modification to the existing environmental test facility. In addition, it is desirable in the industry not only to let snowflakes of a desired size and quality of snow fall on a vehicle, but also to spray a vehicle with snowflakes of a desired size and quality of snow. Has been done.

Secondly, when the generated crystal snow is made wet during snowfall, the generation of crystal snow is adversely affected in the snowmaking section.
More specifically, compared with artificial snow made from ice particles, crystal artificial snow is more susceptible to breakage, and for example, it is technically difficult to convey it to compressed air, so the upper part of the snowfall area in the environmental test room It is highly necessary to provide a snowmaking section in. As a result, where the snowmaking section is required to have a temperature of 0°C or lower, in the snowfall section in the lower part of the same test room, if the temperature of the snowfall section space is increased due to the moistening of the snow, the ascending air current is generated in the upper part. The generation of crystal snow is adversely affected in the snow part and in the snow making part, for example, the growth of crystals is hindered.

It should be noted that Patent Document 3 describes a plurality of roller rotators that are arranged in parallel in the horizontal direction in a test chamber simulating snowfall, and the snow maker at the upper part of the test chamber is described by the plurality of roller rotators. At first glance, the snowfall section at the bottom of the test room seems to be disclosed up to the point that it is partitioned.
However, in a plurality of roller rotators, adjacent roller rotators are intentionally provided with a gap for the following reasons, and a point that separates the snowmaking part at the upper part of the test chamber from the snowfall part at the lower part of the test chamber Made no disclosure, let alone disclosure.

That is, the snowmaking section has a plurality of rotary membrane devices each having a rotatable air-permeable membrane in the form of an endless belt that is stretched between a driving roller and a driven roller, and is arranged vertically. For each gas permeable membrane, air is sent, frost is grown on the surface of the gas permeable membrane, and so-called crystal snow is generated, and while one roller of each of the plurality of rotary membrane devices is aligned horizontally, By arranging the roller rotator between the adjacent rollers, even if the temperature of the snowfall part in the lower part of the test chamber is higher than the temperature of the snowmaking part in the upper part of the test chamber, one roller and the roller By positively discharging a part of the air circulating in the snowmaking section downward from the predetermined gap provided in the rotating body, the air that tries to flow into the snowmaking section upward from the snowfall section is blocked. It prevents the inhibition of frost growth.

That is, in Patent Document 3, particularly in the case of making snowflakes, the air used to generate the snowflakes is used to discharge the snow from a predetermined gap between adjacent rollers toward the snowfall portion. This merely prevents the inflow of air from the snowfall portion to the snowmaking portion.
JP-A-3-236575 JP, 9-329380, A Japanese Patent No. 4549364

In view of the above technical problems, it is an object of the present invention to provide a snowfall system for crystal snow that can prevent heavy snowflakes and wet the crystal snow during snowfall.

In order to achieve the above object, the snowfall system for crystal snow of the present invention,
In the space divided vertically by a partition extending in the horizontal direction, the crystal snow production section is provided in the upper part, and the crystal snow snowfall section is provided in the lower part.
At least one of the snow-melting section, between an upper roller and a lower roller that can be rotationally driven, has a rotating air-permeable membrane device including an endless mesh-shaped membrane body, and in the vicinity of the lower roller. A snow-falling body whose tip edge is separated from the outer surface of the mesh-like film body,
At below freezing, moist air containing water vapor above ice saturation produces crystalline snow on the outer surface of the mesh membrane,
The crystalline snow snowfall section adjusts the temperature and humidity in the space of the crystalline snowfall section, and a snow-wetening device that wets the crystalline snow during the snowfall of the crystalline snow manufactured by the crystalline snow manufacture section. It has a temperature and humidity adjustment device,
The partition is a plurality of rollers that are arranged in parallel with each other with their outer peripheral surfaces facing each other and spaced apart by a predetermined distance, and are rotatable in a direction from the top toward the narrowest part between adjacent rollers,
In a space above the narrowest part, a plurality of rollers arranged so as to be able to receive falling snowflakes,
Each roller constitutes a rotating brush body with bristles planted on the outer peripheral surface, and at the narrowest part between the adjacent rollers, the brushes are overlapped with each other without consolidating the snowflakes, thereby forming a partition. Formed,
Below the plurality of rotating brush bodies, a winding wire mesh is provided which is arranged so as to abut the brush tips of the plurality of rotating brush bodies and is capable of reciprocating horizontally.

Further, the wind-up wire mesh is provided so that the width is longer than the axial length of the plurality of rotary brush bodies, and extends from the rotary brush at one end of the plurality of rotary brush bodies to the rotary brush at the other end.
It is preferable that each of the rotating brushes at both ends has a winding portion so that the rotating brushes can reciprocate horizontally.

Further, a fixed brush may be provided below the winding-type wire mesh so that a tip of the brush faces upward and contacts a lower surface of the winding-type wire mesh.

A first embodiment of a snowflake system 100 for crystal snow according to the present invention will be described below in detail with reference to the drawings.

In the snowfall system 100 for snowflakes, a snowflake production section 20 is provided at an upper portion and a snowfall snowfall portion 22 is provided at a lower portion in a space vertically divided by partitions extending in the horizontal direction.
The snowflake production unit 20 of FIG. 1 sends air cooled to a predetermined temperature by the cooler 2 installed in the insulated snowmaking machine room 1 to the humidifier 4 by the blower 3.

The humidifier 4 supplies water vapor so that the low humidity air has an air humidity higher than ice saturation so that frost can grow. The most suitable humidifying device 4 for this condition is a humidifying pan, not a boiling type humidifying which uses the water temperature for normal air conditioning, but a low temperature water temperature, especially a low temperature humidifying pan with a water temperature setting of 40° C. or less. Is.

Further, in order to uniformly make the entire flow passage more than ice saturation, humidifying pans 5 are provided in multiple stages as shown in FIG. 4 so that the entire flow passage is humidified little by little, and the water in the tank 7 is fed by the pump P to the header. Water is supplied from 6a to each humidifying pan, and the water from the humidifying pan is returned to the tank 7 from the return header 6b.

More important is to keep the humidifying water temperature constant. This is because the humidifying water temperature also raises the sensible heat of the air, so if the water temperature is not kept constant, the air temperature will also have uneven distribution and frost will grow under different temperature conditions.
Therefore, the humidifier is a flowing water type humidifying pan 5 as shown in the system of FIG. 4, and the temperature of the humidifying water is controlled by a heater 8 arranged in a tank 7. Since the surface of the humidifier other than the humidifying surface also becomes a sensible heat load of air, it is necessary to insulate that surface as well.

Other humidification methods can also be adopted if conditions above ice saturation can be created as described above. For example, an ultrasonic humidifier. It goes without saying that the ultrasonic humidifier also needs to be arranged so as to uniformly humidify the flow path as described above. The air from the humidifier 4 is sent into the snow making unit from the sending duct D1.

As shown in FIG. 2 and FIG. 3, the snowmaking unit is composed of the rotary air permeable membrane devices 10 provided at predetermined intervals in the test chamber 308 whose lower part is opened. The apparatus 10 has a pair of upper and lower rotating bodies 11a and 11b with a breathable film body 12 laid between them. One of the upper and lower rotating bodies is used for driving, and the other is driven.

The film body 12 is preferably as flat as possible, and the density of the film is preferably as fine as possible. For example, it is preferable to use a plain weave film of synthetic resin fiber having a mesh for ventilation of about 5 to 300 mesh. The rotation speed of the film is determined according to the growth time of frost, but 0.2 to 5 rph is preferable.

As shown in FIG. 2, a crystal snow drop body 13 for removing the frost M is provided at a position corresponding to the lowermost portion of the film body 12, and the frost M is dropped from the film body 12, and the falling frost causes snowfall S. Become.
The snow-falling snow body is a scraper in which the tip edge is separated from the outer surface of the mesh-like film body 12 in the vicinity of the rotating body 11b, and the gap can be adjusted with respect to the outer surface of the mesh-like film body 12. By adjusting the interval in accordance with the rotation speed of the gas permeable membrane device 10, as will be described later, it is possible to adjust the size of the snowflakes of the crystal snow that has fallen off by the snowflakes falling body 13.
Since there are various means for the snow-dried body 13, there is no particular limitation. For example, a mechanical one such as a rotating brush, or one that blows air to blow off frost may be used.

Frost on the surface of the film body 12 starts to grow after passing through the snow-falling body 13, moves upward due to the rotation of the film body 12, reaches the rotating body 11a, and further descends to the rotating body 11b. While the film body 12 is rotating, the frost M is gradually supplied with the water vapor of ice saturation or more from the humidified air and gradually grows up to reach the lower stage again and is dropped off by the snow-falling snow body 13 in the state of maximum growth.

The remaining frost that has not fallen off at the bottom moves to rotation rise, is given water vapor and starts to grow, and makes one rotation to repeat the same operation. The air that has passed through the rotary air-permeable membrane device 10 is sent again from the return duct D2 by the blower 3 to the snow making unit through the cooler 2, the humidifying device 4, and the feed duct D1.

The advantage of the rotary air permeable membrane device 10 of the present invention is that any portion of the membrane can be supplied with water vapor in a favorable frost state, and that the membrane is in a vented state and has a flat surface state.

Further, when growing frost in a floating state in the air flow, the wind speed of the air flow is limited to 1 m/s or less, but since the frost grows on the film surface in the device of the present invention, a considerably high wind speed (2 to 2 (3 m/s) can be vented, so that a large amount of water vapor can be sent, and thus a large amount of frost can be grown. Furthermore, since the humidity atmosphere on the downstream side of the film is under the condition of ice saturation or less, the components on the downstream side of the film are not frosted as in the other methods. Further, in the present invention, since the airflow temperature is the same, the shape of the crystal is the same in terms of crystal habit, and snowmaking of a single crystal is possible, which is of great utility in the field of scientific experimental research.

The temperature and water vapor state of this device will be described with reference to the psychrometric chart of FIG. The airflow is between the front and rear film bodies 12 of the rotary air-permeable membrane device 10, passes through the film surface, and then flows out from between the front and rear film bodies 12.

As shown in the air diagram of the figure, the air in the inflow part has sufficient water vapor as shown in (1). When the water vapor is used for frost growth on the film surface, the water vapor level decreases with the temperature rise of air due to latent heat of sublimation, and the water vapor decreases to about ice saturation as in (2). Further, in the snowmaking machine room, the sensible heat is further increased by the external sensible heat load as shown in (3), and the atmosphere is completely unsaturated. Further, the sensible heat rises to the state of (4) by the blower and is cooled to (5) by the cooler 2. After that, it is humidified by a humidifier until it is almost saturated with water.

Therefore, the growth range of frost is from the humidifier to the film surface, and unlike other methods of growing frost, frost does not grow in various parts of the component.

Next, the partition extending in the horizontal direction will be described. As shown in FIGS. 1 and 5, the plurality of rollers 306 are arranged above the test chamber 308 so as to partition the test chamber 308. Reference numeral 306 denotes a rotary brush 314 that is planted on the outer peripheral surface 312, and a large number of through holes 316 are provided in the outer peripheral surface 312 so that air is ejected from the inside of each roller 306 through the through holes 316. There is.
As a modification, a plurality of indentations are provided in the dimple shape of the golf ball over the entire one outer peripheral surface of the adjacent rotating brushes 314, so that, as will be described later, the rollers 306 adjacent to the snowflake-shaped crystal snow are adjacent to each other. When passing through the narrowest part of the space, it becomes possible to maintain the crystal state of crystal snow which is easily broken. The width and depth of the plurality of depressions may be determined from such a viewpoint.
The rotating brush 314 may be made of, for example, a resin-made flexible material, and the tip thereof may have a length that comes into contact with the outer peripheral surface 312 of the facing roller 306, and the diameter of the rotating brush 314 and the rotating brush. The density of the outer peripheral surface 312 of the roller 306 of the roller 314 may be appropriately determined from the viewpoint of the area where snow particles may adhere to the outer peripheral surface 312 of the roller 306 excluding the rotating brush 314.
The jet of air may be jetted in a pulsed manner, and by setting the temperature of the air to be cold air of -1°C or less, even if the temperature in the test chamber 308 is 0°C or higher, this atmosphere causes the rotating brush 314 and It is possible to avoid direct contact with the rollers 306 and thus prevent the generated snowflakes from melting. The density of the air through holes 316 may be determined from such a viewpoint. The air flow rate may be determined from the viewpoint of not breaking the snowflakes.

In the case of the roller 306 with the rotating brush 314, the adhering snow grains are not consolidated. Therefore, it is suitable for separating crystalline snow from the roller 306 by the rotating brush 314 and simulating snowfall. Then, the test chamber 308 can be partitioned by arranging the rollers 306 in the horizontal direction by making the length extending to the outer peripheral surface 312 of the facing roller 306. The snow space and the snowfall space are temperature regions independent of each other, and for example, the upper space of the test chamber 308 is used as a snowmaking space with a temperature below zero, while the lower space of the test chamber 308 is used as a snowfall space, and snow is formed. When simulating a snowfall using the generated snowflakes, it is possible to set the snowfall space to zero or more and to make the snow wet during the snowfall.
The crystal snow snowfalling section 22 is a snow-weathering device (not shown) that wets the crystal snowfall during the snowfall of the crystal snowfall produced by the crystal snowfall production section 20, and the space within the crystal snowfall snowfall section 20. And a temperature and humidity adjusting device (not shown) for adjusting the temperature and humidity.
More specifically,

The operation of the snowflake system 100 for crystal snow having the above configuration will be described below.
First, a snowfall space and a temperature/humidity adjusting device are used to prepare a snowfall space. More specifically, the ambient temperature and humidity inside the snowfall space are set to a predetermined value, the plurality of rollers 306 are continuously rotated, and the gap between the snow-falling snow body 13 and the outer surface of the mesh-like film body 12 is set. Is adjusted according to the rotation speed of the rotary air-permeable membrane device 10.
For example, if the diameter of the rotating brush 314 is 50φ to 60φ, the number of rotations of the plurality of rollers 306 is set to 1 RPM to 2 RPM, and the same rotating air permeable membrane device 10 is set on the crystal snow falling on the rotating brush 314. It may be possible to prevent the next crystal snow from falling off, and the branches of the crystal snow are entangled with each other to form heavy snow flakes.
Then, in the upper part of the space partitioned by the partition extending in the horizontal direction into the upper and lower parts, the outer surface of the mesh-shaped film body 12 is rotated below freezing point by the moist air containing the water vapor equal to or more than the ice saturation during the rotation of the rotary air-permeable membrane device 10. In the vicinity of the rotating body 11b, frost-like crystal snow is generated and the crystal snow generated on the outer surface of the mesh-shaped film body 12 is dropped by the crystal snow dropping body 13.
In this case, depending on the rotation speed of the rotary air permeable membrane device 10 and the distance between the outer surface of the mesh-shaped film body 12 and the tip edge of the crystal snow falling body 13, when the generated crystal snow is dropped by the crystal snow falling body 13, Crystal snow may fall off in the state of heavy snow flakes.
The heavy snow flakes are received in the space above the narrowest part between the adjacent rollers 306, and further become heavy snow flakes, and the adjacent rollers 306 are directed toward the narrowest part between the adjacent rollers 306. By the rotation, the heavy snowflake crystal snow passes through the narrowest portion and is guided downward. At that time, the heavy snowflake crystal snow is repelled by the tip of the rotating brush 314 and the crystal itself is broken. Crystal snow that turned into heavy snowflakes is turned into small snowflakes.
At the same time, in the narrowest portion between the adjacent rollers 306, the brushes are overlapped with each other to form a partition, so that the lower space is used in the lower part of the space to moisten the crystal snowfall during snowfall. It is possible to prevent the rising airflow from reaching the upper part of the space by raising the temperature of the snowflakes, and to prevent the growth of crystals in the snowmaking part without hindering the snowfall. Therefore, it is possible to make the crystal snow wet during the snowfall while preventing the formation of heavy snowflakes.

At that time, every other roller is fed downward between the adjacent rollers 306, and the small snowflakes are fed downward by the rotation of the rollers 306 and fall downward as they are to simulate snowfall. Snow is accumulated on the vehicle V, which is a test body.

In the narrowest part 304, since the upper space and the lower space of the test chamber 308 are substantially partitioned by the plurality of rollers 306, in the short term, from the snow-and-snow snow part 22 to the snow-and-snow production part 22. By suppressing the ascending airflow to the snow part 20, it is possible to prevent the snowfall in the snowfall part 22 from being disturbed, and in the long term, the temperature inside the snowfall part 22 and the snowmaking part of the snowfall are increased. By making the internal temperature of 20 uniform, it is possible to prevent the internal temperature of the crystalline snow falling portion 22 from decreasing and preventing the wet snow inside the crystalline snow falling portion 22 from being disturbed.

The second embodiment of the present invention will be described below with reference to FIG. 7. In the following description, the same components as those in the first embodiment will be denoted by the same reference numerals, and the description thereof will be omitted. Below, the characteristic part of the present embodiment will be described in detail.
The feature of the second embodiment of the present invention resides in that a winding-type wire net 500 is provided below the group of rotating brushes 314 that generate snowflakes so as to abut against the brush tip of the group of rotating brushes 314.

A large lump of snowflakes may also snow as it is due to the rotating brush 314 group. The wind-up type wire net 500 is provided to prevent such heavy snowflakes from snowing as it is. However, the mesh size is smaller than the size of the large lumpy snowflakes, for example, 5 mm to 8 mm, from the viewpoint that the large lumpy snowflakes do not fall as they are.
The take-up wire mesh 500 has a width longer than the axial length of the rotary brush 314 group and is provided so as to extend from the rotary brush 314 at one end of the rotary brush 314 group to the rotary brush 314 at the other end. Since the lengths of the brushes provided on the rotary brush 314 from the center of the rotary brush 314 are uniform, the winding-type wire net 500 is installed in a substantially horizontal direction.

The take-up wire net 500 has a take-up portion 502 on each of the rotary brushes 314 at both ends, a known rotary motor 506 is provided on any of the rotary brushes 314, and can be horizontally reciprocated by rotation of the rotary motor 506. ..
The wind-up type wire mesh 500 needs to be horizontally reciprocated while the snow brushes are generated during the rotation of the rotary brush 314 group. The horizontal movement speed of the wind-up type wire mesh 500 is the rotation of the rotary 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. As a result, the time until the snowflakes pass through the mesh of the wind-up wire mesh 500 moving in the horizontal direction and snowfall is ensured.

A fixed brush 504 is provided below the winding wire net 500 so that the tip of the brush faces upward and contacts the lower surface 510 of the winding wire net 500. A plurality of fixed brushes 504 are provided, and each fixed brush 504 is preferably provided at a position where the brushes of the adjacent rotating brushes 314 of the rotating brushes 314 group mesh with each other, that is, below the position where snowflakes are generated. As a result, the snowflakes adhering to the lower surface 510 of the wind-up wire net 500 are scraped off by the fixed brush 504 so that the snow is surely caused to fall.
According to the above configuration, the snowflakes are 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 net 500 moving in the horizontal direction is received and wound. When the take-up wire net 500 hits the brush tip of the rotary brush 314 group, the snowflakes that have turned into heavy snowflakes are repelled in the vertical direction, whereby the snowflakes on the upper surface 508 of the take-up wire net 500 are turned into small pieces and wound up. Snow can pass through the mesh of the wire mesh 500. At that time, 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 is surely made to fall.
When the winding wire mesh 500 is wound on one of the rotating brushes 314 at both ends during horizontal movement, the rotating wire mesh 500 is rotated horizontally by reversing the rotation direction of the rotary motor 502. It suffices to move the reciprocating wire mesh 500 in the opposite direction.
As described above, when the winding wire net 500 is provided below the rotary brush 314 group that generates snowflakes so as to contact the brush tip of the rotating brush 314 group, the winding wire net 500 is not provided. Compared with the above, depending on the mesh of the roll-up type wire mesh 500, it is possible to cooperate with the group of rotating brushes 314 and the roll-up type wire mesh 500 to perform a more partitioning function.

Although the embodiments of the present invention have been described above in detail, various modifications and 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, from the viewpoint of preventing heavy snowflakes from falling, it has been described that the rotation speed of the rotating roller 306 is reduced, but the present invention is not limited to this, and depending on the test conditions, it may be possible to reduce the number of snowflakes. If priority is given to continuous snowfall, the rotation speeds of the rotary roller 306 and the rotary film device may be set as high as possible.
For example, in the present embodiment, as a mode of achieving partitioning and making snowflakes, in the second embodiment, the description has been made assuming that the winding wire mesh arranged so as to hit the brush tips of the rotating brush 314 group is used. Without limitation, the snowflakes on the upper surface 508 of the roll-up type wire mesh 500 may be made into small snowflakes by applying vibration with a fixed type instead of the movable type like the wind-up type wire mesh.

1 is a vertical cross-sectional view showing a first embodiment of a snowflake system 100 for crystal snow according to the present invention. FIG. 6 is an enlarged vertical cross-sectional view of the lower portion of the rotary air permeable membrane body 12 showing a state where crystalline snow is peeled from the surface of the rotary air permeable membrane body 12. The III-III line arrow line view of FIG. The block diagram which shows the specific example of the humidifier|moistener 4. It is a detailed view of the roller with the rotating brush 314 which is a partition in the snowflake system 100 of the crystalline snow of 1st Embodiment of this invention. The psychrometric chart which shows the temperature of the snowfall system 100 of the crystalline snow which concerns on this invention, and the state of water vapor. The longitudinal cross-sectional view which shows 2nd Embodiment of the snowfall system 100 of the crystalline snow which concerns on this invention.

D1 Feed duct D2 Return duct M Frost S Snowfall P Humidification water pump B Snowflakes group V Vehicle X Rotation axis 1 Snowmaking machine room 2 Cooler 3 Blower 4 Humidification device 5 Humidification pan 6a Humidification water feed header 6b Humidification water Return header 7 Humidification water tank 8 Heater 9 Snow making room 10 Rotating air permeable membrane devices 11a and 11b Rotating body 12 Air permeable membrane body 13 Defrosting device 20 Crystal snow production section 22 Crystal snow snowfall section 100 Crystal snow snowfall system 306 Roller 308 Test chamber 310 Concavo-convex portion 314 Rotating brush 316 Through hole 500 Winding wire mesh 502 Winding portion 504 Fixed brush 506 Rotating motor 508 Upper surface 510 Lower surface

Claims (3)

In the space divided vertically by a partition extending in the horizontal direction, the crystal snow production section is provided in the upper part, and the crystal snow snowfall section is provided in the lower part.
At least one of the snow-melting section, between an upper roller and a lower roller that can be rotationally driven, has a rotating air-permeable membrane device including an endless mesh-shaped membrane body, and in the vicinity of the lower roller. A snow-falling body whose tip edge is separated from the outer surface of the mesh-like film body,
At below freezing, moist air containing water vapor above ice saturation produces crystalline snow on the outer surface of the mesh membrane,
The crystalline snow snowfall section adjusts the temperature and humidity in the space of the crystalline snowfall section, and a snow-wetening device that wets the crystalline snow during the snowfall of the crystalline snow manufactured by the crystalline snow manufacture section. It has a temperature and humidity adjustment device,
The partition is a plurality of rollers that are arranged in parallel with each other with their outer peripheral surfaces facing each other and spaced apart by a predetermined distance, and are rotatable in a direction from the top toward the narrowest part between adjacent rollers,
In a space above the narrowest part, a plurality of rollers arranged so as to be able to receive falling snowflakes,
Each roller constitutes a rotating brush body with bristles planted on the outer peripheral surface, and at the narrowest part between the adjacent rollers, the brushes are overlapped with each other without consolidating the snowflakes, thereby forming a partition. Formed,
Below the plurality of rotating brush bodies, a winding-type wire mesh that is arranged so as to abut the brush tips of the plurality of rotating brush bodies and is capable of reciprocating horizontally is provided.
A snowfall system for crystalline snow. The winding wire mesh has a width longer than an axial length of the plurality of rotary brush bodies, and is provided so as to extend from the rotary brush at one end of the plurality of rotary brush bodies to the rotary brush at the other end.
The snowflake system for crystalline snow according to claim 1, wherein each of the rotating brushes at both ends has a take-up portion and is capable of reciprocating horizontally. 3. The snowfall system for crystalline snow according to claim 1, further comprising a fixed brush provided below the winding wire mesh so that a tip of the brush faces upward and contacts a lower surface of the winding wire mesh.

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