JPH05176638A - Snow-melting system for greenhouse - Google Patents

Abstract

PURPOSE:To provide the subject system designed to facilitate greenhouse maintenance through improving snow-melting efficiency. CONSTITUTION:A feed pipe 11 and branched pipes 13, 13 are communicatedly installed inside the roof 2 of a greenhouse of consecutive-chamber structure and hot water circulated through the pipes. Openable upper curtains 8, 9 and a side curtain 10 are equipped and a garret space 20 and an outer wall space 21 are provided around the raising space 23. Thus, independent of the temperature in the raising space 23, both the garret space 20 and the outer wall space 21 can be warmed at any elevated temperatures, thereby accomplishing snow melting in high efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow melting device in a greenhouse used for cultivating plants.

[0002]

2. Description of the Related Art As a conventional snow melting device for a greenhouse, a pipe for sprinkling is provided outside the roof of the greenhouse, and ground water or hot spring water is supplied to sprinkle water (for example, Japanese Patent Laid-Open No. 63-2630).
No. 21), or in addition to this type of sprinkling means, an upper curtain stretched over the ceiling surface in the greenhouse is opened, and heated air in the cultivation space is raised to slide off snow (for example, actual (Kaihei 1-146842) is known.

[0003]

However, in the former case, since the sprinkling pipe is exposed outdoors, the water in the pipe freezes unless drainage is performed during the nighttime in winter. And damage the piping. Further, when groundwater or hot spring water is used for watering, there is also a drawback that the glass in the greenhouse is discolored by impurities in the water.

The latter one is economical because it uses warm air in the greenhouse, but on the other hand, since the greenhouse cannot be heated above the cultivation temperature (15 ° C to 20 ° C) of the crop, a temperature at which a large amount of snow can be melted. However, there was a problem that snow melting efficiency was low.

On the other hand, a greenhouse with a multi-story structure has an advantage that it has a small space volume on the inner side of the roof as compared with a greenhouse with a single structure, and thus has good heating efficiency and ventilation efficiency. It could not be used in a snowy area because there was a risk that the greenhouse would collapse due to the weight of the snow because the snow did not slide down due to snow on the area.

The present invention has been made to solve these problems and provides a snow melting apparatus which is economical, has a high snow melting efficiency, and is easy to manage, and further, a greenhouse having a multi-story structure can be used for snow melting. The purpose is to be able to use even in areas where there are many.

[0007]

According to the present invention, there is provided a heating means inside a roof of a greenhouse, and a shielding means for partitioning an attic space including the heating means and a greenhouse room in an openable and closable manner. It is a snow melting device.

[0008]

As a result of separating the attic space from the greenhouse interior by the shielding means, the heating means can heat the attic space at an arbitrary high temperature irrespective of the temperature inside the greenhouse interior, thereby improving snow melting efficiency.

When heating the heating means, only the narrow attic space partitioned by the shielding means is heated.
The heating efficiency of the attic space is high and economical.

Further, even when a hot water pipe is used as the heating means, since the heating means is arranged inside the roof,
Since the freezing of the water in the pipe is prevented by the warm air in the greenhouse at night, the drainage work in the pipe is unnecessary, and the management becomes easier.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a glass greenhouse having a multi-storied structure, which connects the skirts of each inclined roof portion 2 to each other, and has a trough in a valley between adjacent roof portions 2 and 2. 3 and 3 are provided. 4, 5 are columns, and these columns 4,
The upper parts of 5 are connected to each other by a reinforcing truss 6 (see FIG. 2). Reference numerals 7 and 7 denote skylights, the upper end of which is pivotally attached to the ridge of the roof part 2 and the lower end of which is connected to an arm 17 via a link 16. The arm 17 reciprocates in the lengthwise direction by the operation of the skylight opening / closing motor 18 to open / close the skylights 7, 7, and when the room temperature exceeds a predetermined temperature, a skylight opening / closing motor (not shown) The skylights 7 and 7 are automatically opened upon operation.

Numerals 8 and 9 are upper curtains as a shielding means for partitioning the inside of the greenhouse, which are semi-light-shielding properties formed by vapor-depositing aluminum on a polyester film. When the upper curtains 8 and 9 are closed, an attic space 20 separated from the cultivation space 23 is formed inside the roof part 2.

FIGS. 3 and 4 show a curtain opening / closing mechanism 26 for opening / closing the upper curtain 8. Upper curtain 9
The structure of the opening / closing mechanism is the same as that of the curtain opening / closing mechanism 8, and therefore, illustration and description thereof will be omitted. In FIG.
The upper curtains 8, 8 ... With a length corresponding to the distance between the columns 29, 29 are arranged between the columns 29, 29.
Fasteners 30 arranged in the width direction of the upper curtains 8, 8 ...
The front end portions of the upper curtains 8, 8 ... Are fixed to 30 ...
The rear ends of the upper curtains 8, 8 ... Are fixed to the trusses 6, 6.

On the other hand, drive rods 31 are arranged along the lengthwise direction of the upper curtains 8, 8 ... And the fasteners 30, 30 ... Are fixed on the drive rods 31 at regular intervals. The drive rod 31 is
The supporting wheels 32, 32, ... Provided appropriately on the column 29 hold the column 29 so that it can move in the longitudinal direction. A rack gear 33 is provided at a predetermined position of the drive rod 31, and the rack gear 3
3 is provided with a pinion gear 34 to be meshed. On the other hand, a drive motor 35 and a speed reducer 36 are installed on the column 29, and a gear 37 provided on the output shaft of the speed reducer 36 is connected to the pinion gear 3
Mesh with 4.

Therefore, in the curtain opening / closing mechanism 26,
When the drive motor 35 is normally rotated as shown in FIG. 3, the rack gear 33 moves leftward in the figure via the pinion gear 34, and as a result, the upper curtains 8, 8 ... With the front ends fixed to the fasteners 30, 30. It is expanded to the left side in the figure and the attic space 20 is closed. When the drive motor 35 is rotated in the reverse direction as shown in FIG. 4, as a result of the rack gear 33 moving to the right side in the figure, the upper curtains 8, 8 ... Are contracted to the right side via the fasteners 30, 30 ,. Open 20

On the other hand, as shown in FIG. 1, inside the outer wall,
Side curtain 1 made of the same material as the upper curtains 8 and 9
0 is stretched vertically. The side curtain 10 is also provided with a curtain opening / closing motor (not shown) so that it can be opened and closed. Therefore, when the curtains 8, 9 and 10 are closed, a series of heat retaining spaces is formed in which the outer wall space 21 between the side curtain 10 and the outer wall communicates with the attic space 20.

FIG. 2 is a perspective view schematically showing the construction of the hot water supply passage in the snow melting apparatus of the present invention, and the dimensional ratio of each part is exaggerated for convenience of explanation. In FIG. 2, greenhouse 1
The supply pipe 11 is arranged along one end face of the
The recovery pipe 12 is disposed along the other end face of the. Further, along the inner side of the roof portion 2, the snow melting branch pipes 13, 13 ...
Are arranged in the longitudinal direction of the supply pipe 11, and the start end and the end of the branch pipes 13, 13 ... Are connected to the supply pipe 11 and the recovery pipe 12, and the supply pipe 11, the branch pipes 13, 13, ...
Form an integrated hot water supply passage. Further, the start side of the supply pipe 11 is connected to the supply side of the boiler 14 arranged at an appropriate position, and the end of the recovery pipe 12 is connected to the recovery side.

Further, the supply pipe 11, the branch pipes 13, 13 ...
A heating device (not shown) for heating the cultivation space 23 is provided separately from the hot water supply passage including the recovery pipe 12 and the greenhouse 1.
It is arranged at an appropriate position inside, for example, near the ground.

The usage condition and operation of this embodiment will be described.

First, with the curtains 8, 9, 10 closed as shown in FIG. 1, the cultivation space 23 is constantly heated to a suitable cultivation temperature according to the characteristics of the crop, for example, 15 degrees.

During snowfall, the operator operates the boiler 14 to supply hot water of about 80 degrees. The supplied water is
The supply pipe 11 returns to the recovery side of the boiler 14 through the recovery pipe 12 through the branch pipes 13, 13. In the process of circulation, the roof glass 22 is directly warmed by the branch pipes 13, 13 ... And the attic space 20 and the outer wall space 21 are heated.
Is heated to, for example, 40 degrees. Therefore, the snow that has fallen on the roof 2 is melted on the surface of the roof glass 22 without stopping in the valleys of the roof 2, and flows down into the trough 3 to be discharged.

As described above, in the present embodiment, the curtain 8,
Since the cultivation space 23 and the attic space 20 are separated by 9 and 10, the heating temperature of the attic space 20 is set to the cultivation space 23.
The temperature can be set to an arbitrary high temperature regardless of the temperature and the snow melting efficiency can be improved. Also, due to this improvement in snow melting efficiency, greenhouses with a multi-story structure can be used even in areas with a lot of snow.

When heating with the snow melting device A,
Since only the relatively small volume attic space 20 partitioned by the curtains 8, 9, 10 is heated, the heating efficiency of the attic space 20 is high and economical.

Further, since the supply pipe 11, the recovery pipe 12 and the branch pipe 13 are all arranged inside the greenhouse 1, even when the snow melting apparatus A is not used, the heat in the cultivation space 23 prevents the water in the pipe from freezing. Since it is prevented, the draining work in the pipe at night is unnecessary and the management becomes easier.

Although the hot water pipe is used as the heating means in this embodiment, a steam pipe or a heating wire may be used instead. Further, in the present embodiment, the snow melting device of the present invention is provided in a greenhouse with a multi-building structure, but the present invention is not limited to the multi-building structure, and also in greenhouses with other structures such as a single-building structure. Can be implemented.

[0027]

According to the present invention constructed as described above, as a result of separating the attic space from the greenhouse interior by the shielding means, the heating means can heat the attic space at an arbitrary high temperature irrespective of the temperature in the greenhouse interior. Snow melting efficiency is improved. as a result,
A greenhouse with a multi-story structure can be used even in areas with a lot of snow. Further, when heating the heating means, only the narrow attic space partitioned by the shielding means is heated, so that the heating efficiency of the attic space is high and economical. Further, even when a hot water pipe is used as the heating means, since the heating means is arranged inside the roof, the water in the pipe is prevented from freezing due to the warm air in the greenhouse room at night and the like. This eliminates the need for water draining work, and has various effects of facilitating management.

[Brief description of drawings]

FIG. 1 is a front view showing a greenhouse in which the present invention is implemented.

FIG. 2 is a perspective view schematically showing a hot water supply passage in the snow melting device of the embodiment of the present invention.

FIG. 3 is a side view showing a curtain opening / closing mechanism and a state in which the curtain is opened.

FIG. 4 is a side view showing a curtain opening / closing mechanism and a state in which the curtain is closed.

[Explanation of symbols]

 1 Greenhouse 2 Roof 8, 9 Upper curtain 10 Side curtain 11 Supply pipe 12 Collection pipe 13 Branch pipe 14 Boiler 20 Attic space 21 Outer wall space 23 Cultivation space 26 Curtain opening / closing mechanism 35 Drive motor

Claims (1)

[Claims] A snow melting apparatus for a greenhouse, wherein heating means is provided inside the roof of the greenhouse, and shielding means is provided for partitioning the attic space containing the heating means and the greenhouse interior so as to be openable and closable.