JP2002153144A - Apparatus for melting snow of greenhouse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems that a difference in quantity of heat transfer is produced and it is difficult to effectively perform snow melting operations because the temperature of flowing warm water is different between an upstream side (the feeding side) and a downstream side (the discharging side) of a pipe and the temperature is lower toward the downstream side in a conventional technique in which the flow of the warm water is limited in one direction in all the pipes of plural rows arranged in the same direction as an apparatus for melting snow in a conventional greenhouse and uniformize the quantity of heat transfer and effectively carry out the snow melting operations. SOLUTION: This apparatus for melting the snow of the greenhouse is characterized by arranging a plurality of rows of snow melting pipes for providing a fluid heat to the snow fallen on the roof of the greenhouse and melting the snow in the same direction along the roof and arranging and composing the upstream side of the pipes of the plural rows on the mutual opposite side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow melting apparatus in a greenhouse for growing plants such as vegetables, and belongs to the technical field of agricultural facilities.

[0002]

2. Description of the Related Art As a conventional snow melting apparatus in a greenhouse, as disclosed in Japanese Patent Application Laid-Open No. Hei 5-17638, hot water is supplied from one side to all of a plurality of rows of pipes arranged in the same direction. There was also a method of distributing to the other side. That is, the flow of hot water in all the pipes is limited to one direction.

[0003]

The temperature of the hot water flowing between the upstream side (supply side) and the downstream side (discharge side) of the pipe is different, and the temperature becomes lower toward the downstream side. There is a problem that it is difficult to effectively perform the snow melting action.

[0004] It is an object of the present invention to solve such a problem, to make the heat transfer amount uniform, and to efficiently perform the snow melting action.

[0005]

Therefore, the present invention takes the following technical means in order to solve the above-mentioned problems. That is, a specific means for solving the problem in the present invention is to provide a plurality of rows of snow melting pipes in the same direction along the roof to apply fluid heat to snow accumulated on the roof of the house to melt the snow, The arrangement is such that the upstream side of the pipes in the row is arranged opposite to each other.

[0006]

Therefore, according to the present invention, even if the heat transfer amount differs between the upstream side and the downstream side of the snow melting pipe, a plurality of rows of the snow melting pipes are arranged so that the upstream sides are opposite to each other. The heat transfer amount of the pipe can be made uniform in the pipe direction, and snow can be melted efficiently.

[0007]

Embodiments of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes a greenhouse having a continuous-type structure, in which the skirts of the inclined roofs 2 are connected to each other, and a flowing current flows in a valley between the adjacent roofs 2. A gutter 3 is provided. The connection between the flow trough 3 and the roof 2 is sealed by a seal 4 so as to prevent snow melt from leaking into the greenhouse.

A supply pipe 7 and a recovery pipe 8 connected to a hot water boiler 6 via a three-way valve 5 along one end surface of the house 1.
, And a snow melting pipe 9 piped along the left and right sides sandwiching the flow gutter 3, a snow melting pipe 10 piped up and down along the upper part of the flow gutter 3, and back side surfaces of the roof parts 2, 2 Are provided, and the start and end of each are connected to the supply pipe 7 and the recovery pipe 8, respectively.

That is, the snow melting pipe 9 is connected to the supply path 9a.
And return path 9b, and this supply path 9a
The upstream end is connected to the supply pipe 7 on one side, and the downstream side is U-turned to the other side to form a return path 9.
The return path 9b is connected to the recovery pipe 8 on the one side while communicating with the b side.

In the snow melting pipes 10 and 11, supply routes 10a and 11a and return routes 10b and 1
1b, the upstream start ends of the supply paths 10a, 11a are connected to the supply pipe 7, and the return paths 10b, 11b
Is connected to the recovery pipe 8.

According to such a configuration, the supply paths 9a,
The upstream sides of the return paths 10a, 11a and the return paths 9b, 10b, 11b are opposite to each other. During snowfall, the hot water boiler 6 is operated to supply hot water of about 80 degrees. The supplied hot water is returned from the supply pipe 7 to the recovery side of the hot water boiler 6 by the recovery pipe 8 through the snow melting pipes 9, 10, and 11. In the course of this circulation, each snow melting pipe (piping) 9, 10, 11
Is melted by heat transfer from The melted water flows down the drain gutter 3 and is discharged. In the drawing, reference numeral 12 denotes a hot water control device.

Depending on the amount of snowfall, that is, every time the amount of snowfall increases, pipe 9 ⇒ pipe 9 + pipe 10 ⇒ pipe 9 +
The number of pipes can be increased in the order of the pipes 10 and the pipes 11 to melt snow. For example, in the case of relatively small amount of snowfall, it is performed by using only the pipe 9. In this case, the problem of freezing at an outside air temperature of 0 ° C. or less is avoided. And
In the case of heavy snowfall, the pipe 10 is used in addition to the pipe 9, and the snow melting ability can be enhanced by the direct contact of the pipe 10 with snowfall. Further, when the snow melting ability is required, the pipe 11 is added to further improve the ability.

The attic space 13 and the greenhouse space 14 are separated by a heat retaining curtain 15. Heat retention curtain 1
A portion 15 a of the 5 is configured to be openable and closable with the support 16. If snow melting ability is not enough,
By opening the tenn 15a, the heating heat source in the greenhouse can be used, and the snow melting ability can be increased.

The opening and closing of the heat retaining curtain 15a can be automatically controlled to open and close according to the amount of heating heat in the greenhouse.
That is, the heat retaining curtain 15a is controlled so as to open to a temperature reduction within the allowable range of the crop in the greenhouse. In short, such control is performed by using a computer or the like.
Is used to gradually open the heat retaining curtain 15a until the greenhouse reaches the set temperature, and when the temperature reaches or falls below the predetermined temperature, the curtain 15a is gradually closed. Control to go.

Another embodiment (FIGS. 3, 4, and 5) will be described. When using the snow melting pipe 9 to melt snow,
Is provided with a snowfall sensor LS1 for sensing snowfall. When the sensor LS1 detects snowfall, the snow melting pipe 9
The hot water circulation is started, and when the light beam passes, it is controlled that the hot water circulation is stopped on the assumption that the snow melting is completed. At this time, it reacts to fogging of the coating material, but since the sensor is in the immediate vicinity of the flow gutter, it is possible to avoid malfunctions relatively quickly, melt snow that has slipped down and melt snow until there is no snow on the roof. it can.
Such control is configured to be controlled by the computer 18.

When the snow melting pipe 10 is used, a sensor LS2 may be provided in addition to the snowfall sensor LS1. The snow that has accumulated in the valley of the house can melt while continuing to circulate warm water to the snow melting pipe 10 while the sensor LS2 is sensing. The supply pipe 7 and the recovery pipe 8 are provided with water temperature sensors WT1 and WT2. Outside temperature (WT1 or W
(Water temperature of T2 detection) is 0 ° C or less and there is no snowfall, and
When the drainage is not performed, control is performed such that warm water adjusted via the three-way valve 5 is circulated so that each snow melting pipe does not freeze. When the outside air temperature becomes equal to or higher than a set value (0 ° C. or higher), the operation is automatically stopped.

[Brief description of the drawings]

FIG. 1 is a perspective view of a greenhouse.

FIG. 2 is a cutaway front view of the essential parts of the same.

FIG. 3 is a schematic perspective view of a greenhouse in another embodiment.

FIG. 4 is a front view of a main part of the above.

FIG. 5 is a side view of the essential parts of the same.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Greenhouse 2 Roof part 3 Flow gutter 4 Seal 5 3-way valve 6 Hot water boiler 7 Supply pipe 8 Recovery pipe 9 Snow melting pipe 9a Supply path 9b Return path 10 Snow melting pipe 10a Supply path 10b Return path 11 Snow melting pipe 11a Supply path 11b Return path

Claims (1)

[Claims] 1. A plurality of rows of snow-melting pipes are provided along the roof in the same direction along the roof to apply fluid heat to the snow accumulated on the roof of the house and melt the snow, and the upstream sides of the pipes of the plurality of rows are opposite to each other. A snow melting apparatus for a house, wherein the snow melting apparatus is arranged in such a manner as to be arranged as follows.