Heat-shielding member for plant cultivation house

Abstract

To provide a heat-shielding member for a plant cultivation house capable of adjusting the quantity of sunlight entering the plant cultivation house.SOLUTION: A heat-shielding member 4 comprises a rotary shaft 6 rotatably disposed inside a plant cultivation house 2, a frame 8 fixed to the rotary shaft 6, and a heat-shielding sheet 10 mounted on the frame 8.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a heat shielding member for a greenhouse for cultivating plants. [Background technology]

[0002] Patent Document 1 below discloses a greenhouse for plant cultivation that can effectively insulate the interior of the greenhouse from heat from the outside. The greenhouse for plant cultivation includes a greenhouse frame, an outer sheet member that covers the outer periphery of the greenhouse frame, and an inner sheet member that is placed inside the outer sheet member. The outer sheet member may be made of a vinyl sheet or the like. The inner sheet member is a foldable heat-shielding sheet made of a sheet material coated on both sides with metal foil. This greenhouse for plant cultivation has a double structure consisting of the outer sheet member and the inner sheet member, thereby effectively insulating the interior of the greenhouse from heat from the outside. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-42110 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the plant cultivation greenhouse disclosed in Patent Document 1 has a problem in that it is not possible to adjust the amount of sunlight entering the greenhouse, which limits the plants that can be cultivated. The amount of sunlight required for plant growth varies depending on the plant, and in the plant cultivation greenhouse, the heat-shielding sheet (sheet inner surface member) is fixed, making it difficult to adjust the amount of sunlight entering the greenhouse.

[0005] An object of the present invention is to provide a heat shielding member for a plant cultivation greenhouse that is capable of adjusting the amount of solar radiation that enters the plant cultivation greenhouse. [Means for solving the problem]

[0006] According to the present invention, there is provided the following heat shielding member for a greenhouse for plant cultivation, which solves the above-mentioned problems. "A heat shielding member for a greenhouse for plant cultivation, a rotating shaft rotatably disposed within the plant cultivation house; a frame fixed to the rotation shaft; A heat insulating sheet attached to the frame; A heat-shielding member for a greenhouse for plant cultivation comprising the above is provided.

[0007] Preferably, the rotation axis is arranged along the north-south direction. The heat shielding sheet desirably has light-shielding and light-transmitting properties. The heat shielding sheet is conveniently formed in a mesh shape. The heat shielding sheet may be provided as a pair spaced apart from each other. A transparent sheet may be attached to the frame at a distance from the heat shielding sheet.

[0008] The heat shield according to the present invention preferably includes a rotating means for rotating the rotating shaft. The rotating means may include an electric motor. The rotating means may include an operating means for manually rotating the rotating shaft. [Effects of the Invention]

[0009] In the heat-shielding member for a greenhouse for plant cultivation of the present invention, the amount of solar radiation entering the greenhouse can be adjusted by appropriately rotating the rotation shaft and changing the angle of the heat-shielding sheet relative to the sunlight, thereby expanding the range of plants that can be cultivated in the greenhouse. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram of a greenhouse for plant cultivation in which a plurality of heat-shielding members according to the present invention are installed. [Figure 2] FIG. 2 is a plan view of a plurality of heat shields shown in FIG. [Figure 3] FIG. 2 is an exploded perspective view of the heat shield shown in FIG. [Figure 4] FIG. 10 is an exploded perspective view of a heat shield member in which a pair of heat shield sheets are provided at an interval from each other. [Figure 5] (a) Schematic diagram showing an example of the orientation of the heat shielding member in the morning, (b) Schematic diagram showing an example of the orientation of the heat shielding member at noon, (c) Schematic diagram showing an example of the orientation of the heat shielding member in the afternoon. [Figure 6] FIG. 1 is a schematic diagram showing the flow of air passing through a plant cultivation greenhouse during ventilation. [Figure 7] FIG. 10 is an exploded perspective view of a heat shielding member including a heat shielding sheet and a transparent sheet. [Figure 8] 8A is a schematic diagram showing an example of use of the heat shield member shown in FIG. 7 in summer, and FIG. 8B is a schematic diagram showing an example of use of the heat shield member shown in FIG. 7 in winter. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a heat shielding member for a greenhouse for plant cultivation according to the present invention will now be described with reference to the drawings.

[0012] (Plant cultivation greenhouse 2) Referring to FIG. 1, the plant cultivation greenhouse 2 includes a framework (not shown) and an outer surface member 2a that covers the framework. The framework may be formed from pipes, timber, or the like, which may be made of an appropriate metal material. The outer surface member 2a may be a transparent synthetic resin sheet such as a polyvinyl chloride sheet. Although not shown, the outer surface member 2a may be provided with appropriate entrances and exits for workers and equipment delivery, as well as openings that can be opened and closed for ventilation.

[0013] (Heat shielding material 4) Heat-shielding members 4 are provided inside the plant cultivation house 2 to adjust the amount of solar radiation entering the plant cultivation house 2. In this embodiment, as shown in FIGS. 1 and 2, a plurality of heat-shielding members 4 are arranged on the upper part of the plant cultivation house 2 mainly to adjust the amount of solar radiation entering the plant cultivation house 2 from the roof of the plant cultivation house 2. Although not shown, a plurality of heat-shielding members 4 may be provided along the walls of the plant cultivation house 2. This makes it possible to adjust the amount of solar radiation entering the plant cultivation house 2 from the walls of the plant cultivation house 2. Alternatively, an inner surface member such as a synthetic resin sheet may be provided along the walls of the plant cultivation house 2 at a distance from the outer surface member 2a of the plant cultivation house 2.

[0014] As shown in Figure 3, the heat-shielding member 4 comprises a rotating shaft 6 that is rotatably arranged within the plant cultivation greenhouse 2, a frame 8 fixed to the rotating shaft 6, and a heat-shielding sheet 10 attached to the frame 8.

[0015] (Rotation axis 6) The rotating shaft 6 may be formed into a cylindrical shape from an appropriate metal material or synthetic resin material. The rotating shaft 6 is preferably arranged along the north-south direction. The rotating shaft 6 is rotatably supported by an appropriate support member (not shown). The rotating shaft 6 may be provided with a rotating means (not shown) for rotating the rotating shaft 6. The rotating means may include, for example, an electric motor. The rotating means may also include an operating means (for example, a pull cord or operating lever connected to the rotating shaft 6) for manually rotating the rotating shaft 6.

[0016] (Frame 8) As shown in FIG. 3, the frame 8 is formed into a rectangular shape (frame shape) as a whole from an appropriate metal material or synthetic resin material. The frame 8 has a pair of support portions 8a spaced apart in the depth direction of the frame 8, as indicated by the arrow X, and a pair of connecting portions 8b spaced apart in the width direction of the frame 8, as indicated by the arrow Y. The pair of support portions 8a are connected by the pair of connecting portions 8b. A rotation shaft 6 is fixed to the pair of support portions 8a. The rotation shaft 6 penetrates through the middle of each of the pair of support portions 8a in the width direction (Y direction). That is, in this embodiment, the depth direction (X direction) of the frame 8 coincides with the north-south direction, and the width direction (Y direction) of the frame 8 coincides with the east-west direction.

[0017] (Heat-shielding sheet 10) The heat shielding sheet 10, which has heat shielding properties, can be made of synthetic fibers (such as polyester or acrylic) or natural fibers (such as cotton or wool). Part or all of the surface of the heat shielding sheet 10 may be coated with an appropriate metal film such as an aluminum alloy.

[0018] The heat barrier sheet 10 is preferably light-shielding and light-transmitting. For example, the heat barrier sheet 10 is preferably configured to block approximately 60% to 70% of light and transmit approximately 30% to 40% of light. Therefore, as shown enlarged in FIG. 3, the heat barrier sheet 10 may be formed in a mesh shape (for example, a lattice shape having warp threads 10a and weft threads 10b). When the heat barrier sheet 10 is formed in a mesh shape, the mesh size (the size of the gap) may be, for example, approximately 1 mm to 10 mm. The heat barrier sheet 10 preferably has heat-retaining properties and may also have moisture-absorbing properties.

[0019] The heat shielding sheet 10 has a flat rectangular shape overall, and the size of the heat shielding sheet 10 corresponds to the size of the frame 8. The heat shielding sheet 10 can be attached to the frame 8 via adhesive or adhesive tape. Alternatively, the heat shielding sheet 10 may be fixed to the frame 8 by an appropriate fastener. While FIG. 3 shows an example in which one heat shielding sheet 10 is attached to the frame 8, as shown in FIG. 4, a pair of heat shielding sheets 10 may be attached to the frame 8 with a gap between them. This can improve the heat shielding properties compared to the example shown in FIG. 3.

[0020] In a plant cultivation greenhouse 2 in which a plurality of heat-shielding members 4 are installed as described above, the amount of solar radiation entering the plant cultivation greenhouse 2 can be adjusted by changing the angle of the heat-shielding members 4. For example, as shown in FIGS. 5(a) to 5(c), by changing the angle of the heat-shielding members 4 depending on the position of the sun S, the amount of solar radiation entering the plant cultivation greenhouse 2 can be effectively reduced. FIG. 5(a) is a schematic diagram showing an example of the orientation of the heat-shielding members 4 in the morning, FIG. 5(b) is a schematic diagram showing an example of the orientation of the heat-shielding members 4 at noon, and FIG. 5(c) is a schematic diagram showing an example of the orientation of the heat-shielding members 4 in the afternoon. Note that FIGS. 5(a) to 5(c) show one example of controlling the angle of the heat-shielding members 4. By arbitrarily controlling the angle of the heat-shielding members 4 depending on the plants being cultivated in the plant cultivation greenhouse 2, the amount of solar radiation entering the plant cultivation greenhouse 2 can be adjusted.

[0021] The angle of the heat-shielding member 4 can be changed at any time interval (for example, one hour) depending on the plants being cultivated in the plant cultivation greenhouse 2. The angle of the heat-shielding member 4 may be changed automatically by an electric motor, or may be changed manually by operating an operating means such as a pull cord or an operating lever.

[0022] Furthermore, because the angle of the heat-shielding member 4 can be changed, ventilation inside the plant cultivation greenhouse 2 is not hindered. For example, as shown in FIG. 6, by adjusting the angle of the heat-shielding member 4 to 90 degrees with respect to the ground and opening the openings in the walls and roof of the outer surface member 2a, the inside of the plant cultivation greenhouse 2 can be easily ventilated. In contrast, if a heat-shielding sheet is fixed inside the plant cultivation greenhouse 2 as in the prior art, even if the openings in the walls and roof of the outer surface member 2a are opened, the heat-shielding sheet will hinder the flow of air, making it difficult to ventilate the inside of the plant cultivation greenhouse 2.

[0023] As described above, by appropriately rotating the rotary shaft 6 and changing the angle of the heat shield sheet 10 relative to the sunlight, it is possible to adjust the amount of sunlight entering the plant cultivation greenhouse 2. Therefore, it is possible to expand the range of plants that can be cultivated in the plant cultivation greenhouse 2.

[0024] If the heat shield sheet 10 has not only heat shielding properties but also moisture absorption properties, when condensation occurs on the ceiling inside the plant cultivation house 2, water droplets caused by the condensation can be prevented from falling from the ceiling onto the plants. In winter, heating may be used to regulate the temperature inside the plant cultivation house 2. In this case, condensation occurs inside the plant cultivation house 2 due to the temperature difference between the inside and outside of the plant cultivation house 2, and water droplets caused by the condensation may fall from the ceiling. If such water droplets hit the plants, they may have adverse effects such as corrosion. Therefore, if the heat shield sheet 10 has not only heat shielding properties but also moisture absorption properties, the heat shield sheet 10 will receive and absorb water droplets falling from the ceiling, thereby preventing water droplets from falling onto the plants inside the plant cultivation house 2.

[0025] (Variation 1) Next, a first modified example of the heat-shielding member 4 will be described with reference to FIGS. 7 and 8. A transparent sheet 12 is attached to the frame 8 of the heat-shielding member 4 shown in FIG. 7 at a distance from the heat-shielding sheet 10. The transparent sheet 12 may be formed from a suitable synthetic resin (e.g., polyvinyl chloride) that transmits visible light and ultraviolet light. The transparent sheet 12 is preferably airtight. The transparent sheet 12 is rectangular, and the size of the transparent sheet 12 corresponds to the size of the frame 8. The transparent sheet 12 may be attached to the frame 8 via an adhesive or adhesive tape. Alternatively, the transparent sheet 12 may be fixed to the frame 8 by a suitable fixing device.

[0026] When a heat-shielding member 4 having a transparent sheet 12 is installed in a plant cultivation house 2, as shown in Figure 8(a), in the summer, the heat-shielding sheet 10 of the heat-shielding member 4 can be faced upward (towards the sun S) and the transparent sheet 12 can be faced downward, thereby preventing excessive temperature rise inside the plant cultivation house 2.

[0027] On the other hand, in winter, by facing the transparent sheet 12 of the heat-shielding member 4 upward (toward the sun S) and the heat-shielding sheet 10 downward, the air layer inside the heat-shielding member 4 can be heated and an excessive drop in temperature inside the plant cultivation house 2 can be prevented. Generally, in winter, the inside of the plant cultivation house 2 is heated by a heater and the internal temperature of the plant cultivation house 2 is adjusted to an appropriate temperature. However, if the heat-shielding member 4 has an airtight transparent sheet 12, the transparent sheet 12 can prevent the heat from the heater from escaping from the inside to the outside of the plant cultivation house 2. In other words, the heat-insulating performance of the plant cultivation house 2 can be improved by the heat-shielding member 4.

[0028] (Variation 2) Although not shown, solar cells (for example, spherical solar cells) may be attached to the upper surface of the heat shield 4. In the heat shield 4, the angle with respect to the sun can be adjusted by appropriately rotating the rotation axis 6, and therefore efficient power generation is possible by changing the angle of the heat shield 4 at any time interval so that the solar cells attached to the heat shield 4 face the sun.

[0029] (Variation 3) Furthermore, a light-emitting element such as an LED may be attached to the lower surface of the heat-shielding element 4. In this case, light is irradiated from the light-emitting element attached to the heat-shielding element 4 onto the plants in the plant cultivation greenhouse 2, thereby promoting the growth of the plants. [Explanation of symbols]

[0030] 2: Plant cultivation greenhouse 2a: External member 4: Heat shielding material 6: Rotation axis 8: Frame 10: Heat-shielding sheet 12:Transparent sheet

Claims

1. A heat shielding member for a plant cultivation greenhouse, a rotating shaft rotatably disposed within the plant cultivation house; a frame fixed to the rotation shaft; A heat insulating sheet attached to the frame; A heat-shielding member for a plant cultivation greenhouse.

2. 2. The heat shielding member for a greenhouse for cultivating plants according to claim 1, wherein the rotation shaft is disposed along the north-south direction.

3. 2. The heat shielding member for a greenhouse for cultivating plants according to claim 1, wherein the heat shielding sheet has light-shielding and light-transmitting properties.

4. The heat shielding member for a greenhouse for cultivating plants according to claim 1 , wherein the heat shielding sheet is formed in a mesh shape.

5. 2. The heat shielding member for a greenhouse for cultivating plants according to claim 1, wherein the heat shielding sheets are provided in pairs with a gap between them.

6. 2. The heat shielding member for a greenhouse for cultivating plants according to claim 1, wherein a transparent sheet is attached to the frame at a distance from the heat shielding sheet.

7. 2. The heat shielding member for a greenhouse for cultivating plants according to claim 1, further comprising a rotating means for rotating the rotating shaft.

8. 8. The heat shield for a greenhouse according to claim 7, wherein said rotating means includes an electric motor.

9. 8. The heat shield member for a greenhouse for cultivating plants according to claim 7, wherein the rotating means includes an operating means for manually rotating the rotating shaft.

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