JP2004000061A - Thawing duct and thawing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thawing duct and a thawing system wherein the ability to thaw snow and to keep a greenhouse warm is good, the thawing system does not shade something, assembly is simple, the material cost and the construction cost are low, and the ability to withstand to long-term service is good. <P>SOLUTION: The thawing duct is made of a transparent resin film and has an air inlet and an air outlet being the gap in the region formed by superposing the two end wings extended outwardly of the duct. Desirably, the duct is one in which a tube made of a transparent resin film is set. The duct is set on the valley between opposing transparent resin film roofs. Warm air is fed into the duct, desirably the tube, to thaw the snow on the roof, the air is discharged from the gap, and the snowmelt is discharged through a water discharge trough from a water collection port formed on the upper surface of the duct. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a snow melting duct suitable for melting snow accumulated on the roof and ceiling of a simple building such as a greenhouse, particularly a multi-story simple building, or for keeping a room warm, and a snow melting system incorporating the same. .
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a snow melting apparatus in a greenhouse for promoting plant cultivation, there is known a snow melting apparatus in which a watering pipe is provided outside a roof of a greenhouse and groundwater or hot water is supplied to spray the greenhouse (Japanese Patent Application Laid-Open No. Sho. 63-263221). However, this apparatus has a drawback that the pipes for watering are exposed to the outside, so that the pipes may freeze and damage the pipes unless water is drained from the pipes at night in winter or the like.
[0003]
There is also known a snow removing device in which snow on an inclined roof slides down toward a gutter and melts the snow that has slipped off by a snow melting means installed near the gutter (JP-A-9-107806). This equipment slides down by heating the greenhouse with an air conditioner, heating the roof made of covering material (glass plate, hard synthetic resin plate, etc.), melting the snow on the roof, and gradually removing the snow on the gutter. It is a method of moving in the direction. In addition, hot water pipes and hot water pipes with holes are installed in the gutter of this device in advance, and hot water flowing through the hot water pipes breaks the snow bridge and discharges hot water from the hot water pipe holes. Is a method of melting snow. The roof is a plate, single-ply, and the heat source for melting the snow on the roof is the warm air in the greenhouse. With this method, the nozzle freezes and cannot completely melt the snow, but the accumulated snow turns into a tunnel, the snow melting is insufficient, the nozzle is clogged, and the snow is melted using water instead of air. There is a problem that a powerful pump is required.
[0004]
In addition, a gutter is attached to the valley of the roof of the multi-family house, a hot water circulation pipe is installed in the gutter, and a hot air duct is placed in the room near the valley, and hot air is blown out toward the valley. There has been proposed a snow melting apparatus (for example, Japanese Patent Application Laid-Open No. 11-243789). In this device, snow on a roof covered with a plastic film is melted by warm air in a greenhouse heated by a hot air heater and slides down on a smooth film. Part of the snow that slides down is collected in the gutter, but is melted by the hot water circulating in the hot water pipe and drained down the gutter. If hot air is blown toward the film in an auxiliary manner, the snow cavity above the gutter can be easily melted, which is effective for complete or quick snow melting. However, since the hot air blowout is localized, there is a problem that snow melting is insufficient, a strong pump is required, and the water freezes.
[0005]
Furthermore, a metal hot air duct having a V-shaped wing is formed in the valley of the roof of the multi-story house, the lower surface side is arranged in the greenhouse, the upper surface side is exposed outside the greenhouse, and the upper part of the wing is formed. A snow melting device that connects the lower end of a film for roof to the roof and blows warm air into a duct has also been proposed (Japanese Patent Laid-Open No. 2000-139237). In this device, snow on a roof covered with a plastic film is melted by warm air in a greenhouse heated by a hot air heater and slides down on a smooth film. Part of the snow that slides down accumulates in the upper surface (gutter) of the duct, but the warm air flowing through the duct mainly blows from the upper surface and part of the hot air from the holes on the side of the duct to heat the wing. . As a result, a considerable amount of snow accumulated in the gutter can be quickly melted. Since the duct is made of metal, the shadow of the duct is formed on the plants in the greenhouse. In areas where shadows are formed, the growth of plants becomes insufficient, and crops with high commercial value cannot be obtained. For this reason, there is also a problem in a case where the planting in the shadow generating part has to be stopped to reduce the planting area. There is also the problem of metal corrosion.
[0006]
[Problems to be solved by the invention]
Therefore, the present invention solves the disadvantages of the conventional snow melting apparatus, that is, good snow melting and heat retention performance, cannot cast shadows based on the snow melting system, simple assembly and construction, low material costs and low construction costs, It is an object of the present invention to provide a snow melting duct and a snow melting system that can withstand long-term use.
[0007]
[Means for Solving the Problems]
A first aspect of the present invention is a snow melting duct made of a transparent resin film having an air supply port for supplying warm air and an exhaust port for discharging air.
[0008]
A second aspect of the present invention is a transparent resin film snowmelt in which a transparent resin film tube provided with an air supply port and a gas ejection port on a peripheral surface is placed in a transparent resin film snowmelt duct having an exhaust port. It is a duct.
[0009]
Preferably, the snow melting duct is constituted by two transparent resin films, and the exhaust port is a gap between the overlapping regions of the end wings of the film, and the supplied warm air is discharged from the exhaust port. It is a snow melting duct.
[0010]
Preferably, the above-mentioned snow melting duct has a water collecting port on the upper surface side of the snow melting duct, and has a drain gutter connected to the water collecting port and extending downward.
[0011]
The third aspect of the present invention is to install any one of the above-described snow melting ducts on the roof valley or eaves of a simple building having a roof made of a transparent resin film, supply warm air into the snow melting duct, and melt the snow. This is a snow melting system that discharges air supplied to the snow melting duct from the snow melting duct while maintaining the duct in an expanded state.
[0012]
A fourth aspect of the present invention is to install any one of the above-described snow melting ducts on the roof valley or eaves of a simple building having a roof made of a transparent resin film, and supply warm air from the air inlet of the tube. This is a snow melting system in which air supplied from a snow melting duct is discharged from a snow melting duct while being supplied from a gas jet opening provided in a tube to a snow melting duct and maintaining the snow melting duct in an expanded state.
[0013]
The fifth aspect of the present invention is to install the snow melting duct of the first invention or the second invention in the valley or eaves of the roof of the simple building in which the roof is double-built with the transparent resin film, and to discharge warm air. The air supplied from the air supply port of the tube is injected into the snow melting duct from the gas outlet provided in the tube, supplied to the snow melting duct, and the air supplied to the snow melting duct is maintained while maintaining the snow melting duct in an expanded state. This is a snow melting system that discharges from the snow melting duct, supplies warm air separately to the space of the double film that constructs the roof, and discharges the air supplied to the space from the exhaust port.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
The structure and configuration of the snow melting duct and snow melting system of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.
A first aspect of the present invention is a snow melting duct made of a transparent resin film having an air supply port for supplying warm air and an exhaust port for discharging air. The cross-sectional shape of the snow melting duct of the present invention is generally cylindrical or rectangular, but is not limited to this. Other shapes may be used. Even in the case of a rectangular tube, it is preferable that the tension is as small as possible. The snow melting duct of the present invention is preferably a tubular material formed by sandwiching two films with film fasteners, but the tubular material is formed by welding around the two films. Is also good. At the longitudinal end of the snow melting duct, the film may be sandwiched by a film fastener, or the film may be welded.
[0015]
The snow melting duct 1 of the present invention will be described with reference to FIG.
The snow melting duct 1 is made of a rectangular tubular transparent resin film. An end wing 4 made of a transparent resin film extends outward from an upper surface and / or a side surface of the snow melting duct 1 and overlaps with an end of the transparent resin film constituting the roof. Warm air is supplied from the air supply port 2, and air in the snow melting duct 1 is discharged from the exhaust port 3.
[0016]
Next, FIG. 2 will be described.
The snow-melting duct 1 is a tubular material in which two transparent resin films are sandwiched between film fasteners 41 and 42, and a gap exists in an overlapping region sandwiched between the film fasteners 41 and 42. Warm air is supplied from the air supply port 2, and the air in the snow melting duct 1 is discharged out of the gap from the snow melting duct 1 instead of the exhaust port 3.
[0017]
The size of the cross section of the snow melting duct 1 depends on the size of the roof of the simple building, the size of the valley, etc., but in the case of a cylindrical shape, the diameter is preferably 5 to 200 cm, more preferably 25 to 200 cm. 150 cm. The length of the snow melting duct 1 is preferably substantially the same as the depth of the roof and the depth of the valley.
[0018]
The diameter of the supply port 2 and the exhaust port 3 is preferably 1 to 60 cm, more preferably 4 to 30 cm. The air supply port 2 is preferably configured to be connectable to a pipe (not shown) extending from a device that generates warm air such as a hot air heater.
[0019]
In addition, as shown in FIG. 4, a water collecting port 31 is provided on the upper surface side of the snow melting duct 1 at an intermediate portion in the depth of the snow melting duct 1, and a drain gutter 32 extending downward is connected to the water collecting port 31. Is also good. Due to the weight of the drainage gutter 32, the upper surface of the snowmelt duct 1 is inclined in the direction of the drainage gutter 32, so that the snowmelt water on the snowmelt duct 1 naturally flows toward the water collecting port 31.
[0020]
End wings 4 of two transparent resin films extend outward from the upper surface and / or side surface of the snow melting duct 1. When the two end wings 4 are overlapped and joined by the film fasteners 41 and 42 shown in FIG. 5, a slight gap is formed in the overlap region of the two end wings 4 and air is generated from the gap. Is exhausted out of the snow melting duct 1. Examples of the film fastener include a commercially available Slyloc type “Srailer” (trade name, manufactured by Totokogyo Co., Ltd.). Instead of the film fasteners 41 and 42, the transparent resin films which are overlapped may be joined by welding. In that case, it is preferable to provide the exhaust port 3 in the snow melting duct 1.
[0021]
As the transparent resin film, a film of a thermoplastic resin such as a fluororesin, a vinyl chloride resin, a polyester resin, and a polyethylene resin can be used. However, the fluororesin film is transparent, has mechanical strength, weather resistance, ultraviolet resistance, and heat resistance. It is preferable from the viewpoint of, for example, weldability. Examples of the fluororesin include ethylene-tetrafluoroethylene-based copolymer (hereinafter abbreviated as ETFE), hexafluoropropylene-tetrafluoroethylene-based copolymer (hereinafter abbreviated as FEP), perfluoro (alkyl vinyl ether)- Tetrafluoroethylene copolymer (hereinafter abbreviated as PFA), tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride-based copolymer (abbreviated as THV), polyvinylidene fluoride, vinylidene fluoride-hexafluoro Propylene-based copolymers, polyvinyl fluoride and the like can be mentioned. It is preferably at least one member selected from the group consisting of ETFE, FEP and THV, and more preferably ETFE. The thickness of the fluororesin film is determined mainly in consideration of the mechanical strength of the resin, but is preferably 40 to 200 μm, more preferably 50 to 160 μm.
[0022]
The inside surface of the transparent resin film on the indoor side of the simple building is subjected to a hydrophilic treatment to make it easy for water droplets to flow even if moisture on the indoor side is condensed on the transparent resin film. It is preferable to reduce the influence such as inhibiting the growth of crops. Examples of the method of hydrophilization include a method of coating a solution of an inorganic colloid, a hydrophilic resin, and a metal oxide with a coating machine, a method of spraying, a method of sputtering a metal oxide such as silicon, tin, and titanium. Is preferred.
[0023]
In the second embodiment of the present invention, a transparent resin film tube 11 provided with an air supply port 12 and a gas outlet 13 on the peripheral surface is placed in a transparent resin snow melting duct 1 having an exhaust port. This will be described with reference to FIG.
[0024]
The structure, configuration, cross-sectional shape, cross-sectional size, and length of the snow melting duct 1 composed of two transparent resin films are the same as in the first invention. Since a gap is formed in the overlapping region of the end wings 4 of the two transparent resin films of the snow melting duct 1 sandwiched between the film fasteners 41 and 42 shown in FIG. It becomes the air exhaust port. A separate air supply port 2 and a separate exhaust port 3 are not required in the snow melting duct 1 itself, but may be provided. The diameters of the supply port 2 and the exhaust port 3 are the same as in the first embodiment. Further, it is preferable that the air supply port 2 can be connected to a pipe 28 extending from a device that generates warm air such as a warm air heater.
[0025]
The cross-sectional shape of the tube 11 is generally a cylinder or a square tube, but is not limited thereto. Other shapes may be used. Even in the case of a rectangular tube, it is preferable that the tension is as small as possible. The size of the cross section of the tube 11 is not particularly limited as long as it is movable in the snow melting duct 1, but in the case of a cylindrical shape, the diameter is preferably 2 to 190 cm, more preferably 5 to 50 cm. The length of the tube 11 is preferably about ２〜 to ／ of the length of the snow melting duct 1. As the transparent resin film forming the tube 11, the same transparent resin film as the snow melting duct 1 can be used, and a fluororesin film is preferable. Although the transparent resin film forming the tube 11 is slightly thinner or softer than the transparent resin film forming the snow melting duct 1, the snow melting duct 1 is damaged when the tube 11 moves in the snow melting duct 1. It is preferable because there is little fear.
[0026]
The diameter of the air supply port 12 of the tube 11 is preferably about １ ／ to ／ of the diameter of the tube 11. Further, it is preferable that the air supply port 12 is configured to be connectable to a pipe 28 extending from a device that generates warm air such as a warm air heater.
A gas outlet 13 is provided on the peripheral surface of the tube 11. The number of gas jets 13 is 20 to 1000 / m ² Is preferred, and 40 to 400 pieces / m ² Is more preferred. The diameter of the jet port 13 is preferably 3 to 20 mm, more preferably 5 to 15 mm. The supplied warm air blows out from the gas outlet 13 to maintain the snow melting duct 1 in a tensioned state.
[0027]
As in the first embodiment, as shown in FIG. 4, a water collecting port 31 is provided at a substantially middle portion on the upper surface side of the snow melting duct 1 and a drain gutter 32 extending downward is connected to the water collecting port 31. When configured, the snowmelt water on the snowmelt duct 1 is drained smoothly.
[0028]
A third aspect of the present invention is to dispose the snow melting duct 1 of the first or second aspect of the present invention in the valley 24 or the eaves of the roof 23 of the simple building 22 in which the roof is constructed with a transparent resin film, thereby providing warm air. Is supplied into the snow melting duct 1 and the snow melting duct 1 is maintained in an expanded state, and the roof 23 of the simple building 22 and the snow melting system 21 on the snow melting duct 1 are described with reference to FIG. I do.
[0029]
In a multi-story house (simple structure) 22 constructed from a main body frame 25 and a roof frame 26, a transparent resin film is stretched around the main body frame (posts) 25 from the roof frame 26 to the ground, A wall 27 is built. Further, the roof 23 is constructed by extending the transparent resin film on the roof frame 26, that is, the frame such as the rafter, the rafter, and the purlin if necessary. Then, the snow melting duct 1 of the first invention having the same length as the depth of the valley 24 is disposed in the space of the valley 24 of the roof facing the slope.
[0030]
End wings 4 of two transparent resin films extending outward from the upper surface and / or the side surface of the snow melting duct 1 are overlapped with a transparent resin film constituting a roof, and a long film fastener (not shown). And is fixed to the roof frame 26. Thereby, the roof 23 and the snow melting duct 1 are continuous, and a simple building is constructed. The roof of the simple building 22 is not limited to the gable-type tandem type, but may be a roof-type or Kamaboko type tandem type facing roof.
[0031]
After arranging the snow melting duct 1 as described above and constructing the roof 23, warm air from the warm air heater is supplied through the pipe 28 from the air supply port 2 of the snow melting duct 1, and the snow melting duct 1 is in a tensioned state. To maintain. The air in the snow melting duct 1 is discharged from the discharge port 3. The snowmelt water is drained from a water collecting port (not shown) provided at a substantially intermediate portion on the upper surface side of the snow melting duct 1 through a drain gutter (not shown) extending below the water collecting port.
[0032]
A fourth aspect of the present invention is that, compared to the third aspect, a tube 11 made of a transparent resin film is placed in the snow-melting duct 1, warm air is supplied to the tube 11, and the gas is discharged from the gas outlet 13 of the tube 11. The present invention is the same as the third invention except that the configuration and steps for ejecting the gas to the snow melting duct 1 are added, and the air supply port is not essential for the snow melting duct 1.
[0033]
The fifth aspect of the present invention is to install the snow melting duct 1 in which the tube 11 of the second invention is placed in the valley 24 or the eaves of the roof 23 of the simple building 22 in which the roof 23 is double-built with a transparent resin film. Then, warm air is supplied into the tube 11 from the air supply port 12 of the tube 11, and is ejected from the gas outlet 13 provided in the tube 11 into the snow melting duct 1, and is supplied to the snow melting duct 1. While maintaining the tension state, the air supplied to the snow melting duct 1 is discharged to the outside of the snow melting duct 1 from the exhaust port. At the same time, warm air is separately introduced into the space of the double transparent resin film forming the roof 23 from the air supply port 29 to maintain the space in tension, and then the air in the space is exhausted to the exhaust port 30. Is discharged from As described above, the snow melting system 21 that allows the warm air to flow through the roof 23 and the snow melting duct 1 of the simple building 22 and melts the snow on the roof 23 and the snow melting duct 1 of the simple building 22 includes one of the following. An example will be described with reference to FIG.
[0034]
In a multi-story house (simple structure) 22 constructed from a main body frame 25 and a roof frame 26, a transparent resin film is stretched around the main body frame (posts) 25 from the roof frame 26 to the ground, A wall 27 is built. Further, the roof 23 is constructed by double-extending the transparent resin film on the roof frame 26, that is, the framework of the rafters, the rafters, and the purlin if necessary. Then, in the space of the valley portion 24 of the roof facing inclining, the snow melting duct 1 in which the tube 11 is indwelled according to the second invention having the same length as the depth of the valley portion 24 is arranged.
[0035]
At this time, the end wings 4 of the two transparent resin films extending outward from the snow melting duct 1 and the ends of the transparent resin film constituting the roof 23 are superimposed, and the film fasteners 41 and 42 shown in FIG. It is joined and fixed to the roof frame 26. Thereby, the roof 23 and the snow melting duct 1 are continuous, and the simple building 22 is constructed in the same manner as the third invention. Of course, the roof 23 of the simple building 22 is not limited to the gable-type connected building type, but may be a roof-type or Kamaboko-shaped connected building facing roof 23. The end wing 4 extending from the snow melting duct 1 and the transparent resin film forming the roof 23 may be joined by welding or the like, and then fixed to the roof frame 26.
[0036]
After arranging the snow melting duct 1 and constructing the roof 23 as described above, warm air from the warm air heater is supplied from the air supply port 12 of the tube 11 through the pipe 28 to maintain the tube 11 in a tensioned state. Then, the gas is ejected from the gas ejection port 13 on the peripheral surface of the tube 11 into the snow melting duct 1 to maintain the snow melting duct 1 in a tensioned state. The air in the snow melting duct 1 is discharged from the gap between the end wings 4. The snowmelt water is drained from a water collecting port (not shown) provided at a substantially intermediate portion on the upper surface side of the snow melting duct 1 through a drain gutter (not shown) extending downward to the water collecting port.
[0037]
In the present invention, the temperature of the warm air at the air inlet 2 of the snow melting duct 1 or the air inlet 12 of the tube 11 is preferably 5 to 80 ° C, more preferably 5 to 60 ° C, and most preferably 8 to 55 ° C. . While maintaining the snow melting duct 1 in a tensioned state, air is discharged out of the snow melting duct 1 from the exhaust port. The temperature near the exhaust port is affected by the supply air temperature, its flow rate, the outside air temperature, the indoor temperature of the simple building 22, and the like. If the temperature is too low, the snow melting effect may be insufficient. Adjust the supply air temperature and flow rate to obtain the appropriate snow melting effect. The temperature near the exhaust port is usually preferably lower by 5 to 80C, more preferably lower by 5 to 60C, and most preferably lower by 8 to 55C than the temperature of the air supply port 2.
[0038]
Warm air from the warm air heater is also supplied directly from the air supply port 29 to the space of the double transparent resin film forming the roof 23 through the pipe 28. The air in the space is exhausted from the exhaust port 30. Of course, when the roof 23 having the space made of the double transparent resin film is divided, the communication pipe 33 is preferably installed between the divisions to allow air to flow through the division. In that case, It is preferable to provide an exhaust port 30 in each section.
[0039]
Next, the operation and effect of the snow melting duct and the snow melting system of the present invention will be described. The snow deposited on the sloped roof 23, such as a gable type, a ridge type, or a kamaboko type made of a transparent resin film, melts from the contact surface with the roof by heating or the like to promote the growth of plants in the greenhouse. The roof 23 slides down and is deposited on the snow melting duct 1 filling the space of the valley 24 of the facing roof 23. Warm air from a warm air heater or the like is continuously supplied to the snow melting duct 1 or the tube 11 in the snow melting duct 1 to maintain the snow melting duct 1 or the tube 11 and the snow melting duct 1 in a tight state. At this time, the warm air in the snow melting duct 1 comes into contact with the snow sliding down from the inclined roof 23 through the transparent resin film constituting the snow melting duct 1, so that the snow accumulated in the snow melting duct 1 is melted. it is conceivable that. The diameter of the air supply port 29 is preferably 1 to 60 cm, more preferably 4 to 30 cm. The diameter of the exhaust port 30 is preferably 4 to 80 mm, more preferably 5 to 40 mm. The diameter of the communication pipe 3 is preferably 1 to 60 cm.
[0040]
By adjusting the temperature of warm air supplied to the snow melting duct 1 or the tube 11 and the flow rate of warm air, the speed and amount of snow melting can be adjusted. It is preferable that the snowmelt water is directed to a water collecting port 31 provided on the upper surface of the snowmelting duct 1 in the valley 24, and is drained to the ground in the greenhouse from a drain gutter 32 connected to the water collecting port 31.
[0041]
When there is no snow on the roof 23 and / or the snow melting duct 1 and the temperature is considerably low, warm air is supplied to the snow melting duct 1 or the tube 11 as in the case of snow melting, and the simple structure The heat retention in the interior 22 can be assisted from the direction of the snow melting duct 1 and further from the roof 23.
[0042]
Furthermore, when the roof 23 is constructed of a double resin film, not only the snow melting duct 1 but also the roof 23 can be heated to a temperature higher than the heating temperature for keeping the room of the simple structure 22 warm. Alternatively, since the temperature and flow rate of the warm air blown into the room of the simple structure 22 can be reduced, the effect of keeping the room warm can be increased.
[0043]
Next, the present invention will be described more specifically with reference to an embodiment based on FIG.
It is a greenhouse 22 constructed from a main body frame 25 and a roof frame 26, and has a valley portion 24 of a roof 23 at an intermediate point between the columns 25, with a distance between the front columns of 12m, a depth of 6m, and a ridge height of 6.3m. A greenhouse 22 having an inclination angle of the roof 23 of 20 ° was constructed on a farm in Urasu-cho, Kabarido-gun, Hokkaido. An ETFE film (thickness: 100 μm, manufactured by Asahi Glass Co., Ltd., “Fclean” (registered trademark)) was spread over the entire surface from the roof frame 26 to the ground around the main body frame 25 to construct the wall 27. In addition, on the framework of the roof frame (a rafter, a rafter, a main house, etc.) 26, the ETFE film was double-stretched to construct the roof 23.
[0044]
The end wings 4 of the snow melting duct 1 made of two ETFE films are overlapped on the valleys 24 of the facing roof 23 with the ends of the two ETFE films constituting the roof 23 to show the overlapping area. 5, a snow melting duct 1 having a width of 108 cm, a height of 40 cm, and a length of 600 cm was formed by being sandwiched between the film fasteners 41 and 42 shown in FIG. Even after being fixed, a gap was formed in the overlapping region of the transparent resin film. Inside the snow melting duct 1, a tube 11 having the same length as the depth of the valley 24 and a diameter of 10 cm was placed. 80 tubes / m in tube 11 ² A gas outlet 13 having a diameter of 1 cm was provided at intervals such that
[0045]
Next, warm air from a warm air heater is supplied through a pipe 28 having a diameter of 5 cm from an air supply port 12 of a tube 11 having a diameter of 5 cm, the tube 11 is maintained in a tension state, and a peripheral surface of the tube 11 is formed. Warm air was blown from the gas outlet 13 into the snow melting duct 1 to maintain the snow melting duct 1 in a tensioned state. The air in the snow-melting duct 1 was discharged into the greenhouse 21 from a gap formed even when the transparent resin films overlapped were sandwiched by film fasteners (not shown). Warm air from the warm air heater was also supplied to the space between the two transparent resin films constituting the roof 23 from the air supply port 29 having a diameter of 5 cm through the pipe 28. Warm air spread throughout the roof 23 through a communication pipe 33 having a diameter of 5 cm. The air in the roof 23 was exhausted from the exhaust port 30 having a diameter of 1 cm.
[0046]
Warm air was constantly supplied into the tube 11 for about two months from February 1, 2002 to April 5, 2002. The temperature of the warm air is 44.4 ° C. ± 8.4 ° C. at the inlet 12 and 29.4 ° C. to -14.5 ° C. at the outlet 13 and the flow rate is 0.1 m. ³ / Min. The temperature of the warm air supplied to the inside space of the two transparent resin film bags of the roof 23 is 44.4 to 8.4 ° C. at the air supply port 29 and 52.5 to −2.5 at the exhaust port 30. 0.3 ° C, the flow rate is 0.1m ² / Min.
[0047]
Although the total snowfall during that period was 217 cm, all the snow that fell on the roof 23 melted and did not accumulate. The maximum snowfall per day during this period was 16 cm on March 4, but even on the same day (highest temperature -1.1 ° C, lowest temperature -6.2 ° C), the roof 23 and the snowmelt duct 1 did not. All of the snow that had fallen on melted and did not accumulate.
[0048]
【The invention's effect】
Since the snow melting duct of the present invention is made of a transparent resin film, for example, even if it is installed in a valley of a roof in the case of a continuous greenhouse, since it does not produce shadows, the influence on the degree and speed of plant growth is not affected. There is no shadow and there is no shadow, so the arable land area in the greenhouse can be maximized. Also, since it is lightweight, the workability of construction at several meters above the ground is good. The snow melting duct of the present invention can melt snow so that the continuous greenhouse does not collapse with snow accumulated in the valley. In addition, when a fluororesin film is used as the transparent resin film, weather resistance, ultraviolet resistance, mechanical strength, and the like are excellent, so that the period of refilling the transparent resin film can be as long as ten or more years.
[Brief description of the drawings]
FIG. 1 is a sketch showing an example of a snow melting duct of the present invention.
FIG. 2 is a sketch drawing showing another example of the snow melting duct of the present invention.
FIG. 3 is a sketch drawing showing another example of the snow melting duct of the present invention.
FIG. 4 is a sketch drawing showing another example of the snow melting duct of the present invention.
FIG. 5 is a sketch showing an example of a film fastener used in the present invention.
FIG. 6 is a sketch showing an example of the snow melting system of the present invention.
FIG. 7 is a sketch showing another example of the snow melting system of the present invention.
[Explanation of symbols]
1: Snow melting duct
2: Air inlet
3: Exhaust port
4: Wing
11: Tube
12: Tube inlet
13: Gas outlet
22: Simple building
23: Roof
24: Tanibe
25: Body frame
26: Roof frame
27: Wall
28: Pipe
29: Duct air inlet
30: Exhaust port of duct
31: Water intake
32: Drain gutter
33: Communication pipe
41, 42: film fastener

Claims (7)

A snow-melting duct made of transparent resin film with an air supply port for supplying warm air and an exhaust port for discharging air. A transparent resin film snowmelt duct in which an air supply port and a transparent resin film tube provided with a gas outlet on the peripheral surface are placed in a transparent resin film snowmelt duct having an exhaust port. 3. The method according to claim 1, wherein the snow-melting duct is formed of two transparent resin films, the exhaust port is a gap between the overlapping regions of the end wings of the film, and the supplied warm air is discharged from the exhaust port. The described snowmelt duct. 4. The snow melting duct according to claim 1, wherein the snow melting duct has a water collecting port on the upper surface side, and has a drain gutter connected to the water collecting port and extending downward. The snow melting duct according to any one of claims 1 to 4 is installed in a valley or eaves of a roof of a simple building having a roof made of a transparent resin film, and warm air is supplied into the snow melting duct, and the snow melting duct is provided. A snow melting system that discharges the air supplied to the snow melting duct from the snow melting duct while maintaining the air in an expanded state. A snow melting duct according to claim 2, 3 or 4 is installed in a valley or eaves of a roof of a simple building having a roof made of a transparent resin film, and warm air is supplied from an inlet of the tube. A snow melting system in which air is supplied from the gas blowing port provided in the snow melting duct and supplied to the snow melting duct, and the air supplied to the snow melting duct is discharged from the snow melting duct while maintaining the snow melting duct in an expanded state. The snow melting duct according to claim 2, 3 or 4 is installed in a valley or eaves of a roof of a simple structure having a double roof made of a transparent resin film, and warm air is supplied from a supply port of the tube. , Air is supplied from the gas discharge port provided in the tube into the snow melting duct and supplied to the snow melting duct, while maintaining the snow melting duct in an expanded state, while discharging the air supplied to the snow melting duct from the snow melting duct, A snow melting system that separately supplies warm air to the space of the double film, and discharges the air supplied to the space from the exhaust port.

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