Film greenhouse capable of automatically controlling temperature by using sunlight

Abstract

The utility model relates to a film greenhouse capable of automatically controlling temperature by utilizing sunlight, which comprises arched sheds and film covers, the film covers cover two adjacent arched sheds, and the film covers are fixed at the top ends or the peripheries of frameworks of the two arched sheds to form a coating structure of the film greenhouse; the film cover is provided with a floating part corresponding to the ground of the gap part between the two arched sheds, and the floating part is provided with a plurality of ventilation holes capable of conducting air convection with the outside of the arched sheds. The floating part of the film cover forms a sinking or floating structure through temperature difference buoyancy inside and outside the film greenhouse, and when the floating part sinks, the ventilation hole is tightly attached to the ground of the gap part between the two arched sheds to form a film greenhouse temperature rise and heat storage structure; when the temperature difference inside and outside the film greenhouse enables the floating part to float, the ventilation hole is separated from the ground of the gap part between the two arched sheds, so that air flow inside and outside the film greenhouse exchanges to form a circulation with balanced heat floating force, and an automatic temperature control structure of the film greenhouse is formed. The system has the advantages of being easy to construct, convenient to manage and low in construction and management cost.

Description

Technical Field

[0001] The utility model relates to a film greenhouse which automatically controls temperature by utilizing sunlight. Background Art

[0002] The existing temperature control method of film greenhouses is to use manual or electrical automation ventilation and heat dissipation, so the labor cost and equipment cost are relatively high. At the same time, electrical automation ventilation and heat dissipation also has a certain risk of failure. Summary of the invention

[0003] The purpose of the utility model is to provide an automatic temperature-controlled film greenhouse which is easy to construct and manage and has low construction and management costs in view of the above-mentioned existing problems.

[0004] The principle of the utility model is to use sunlight to heat the air in the greenhouse, float up and hold up the plastic film with preset ventilation holes to conduct convection ventilation with the outside world, so as to automatically lower the temperature in the greenhouse, automatically form a thermal buoyancy lift balance, and keep the temperature in the greenhouse suitable for plant growth.

[0005] The purpose of the utility model is achieved in this way. A film greenhouse that automatically controls temperature by sunlight includes an arch shed and a film cover, wherein the film cover covers two adjacent arch sheds, and the film cover is fixed on the top or periphery of the skeletons of the two arch sheds to form a covering structure of the film greenhouse; the film cover is provided with a floating part corresponding to the ground of the gap between the two arch sheds, and the floating part is provided with a plurality of ventilation holes that can conduct air convection with the outside of the arch shed; the floating part of the film cover forms a sinking or floating structure through the buoyancy of the temperature difference between the inside and outside of the film greenhouse, and when the floating part sinks, the ventilation holes are close to the ground of the gap between the two arch sheds, forming a temperature-raising and heat-storing structure of the film greenhouse; when the temperature difference between the inside and outside of the film greenhouse causes the floating part to float, the ventilation holes are separated from the ground of the gap between the two arch sheds, so that the airflow exchange inside and outside the film greenhouse forms a cycle with a balanced heat buoyancy, forming an automatic temperature control structure of the film greenhouse.

[0006] In the utility model, the ventilation holes are arranged on the central axis between the two corresponding arch sheds.

[0007] The utility model has a ventilation hole diameter of 15-60 mm.

[0008] In the utility model, a plurality of temperature difference control weights are arranged on the floating part, and the temperature difference of the film greenhouse can be controlled by utilizing the weights arranged on the floating part.

[0009] The utility model has the following positive effects:

[0010] 1) There is no need for electrical, energy and mechanical equipment to automatically cover the greenhouse, which greatly reduces the construction cost of the temperature-controlled greenhouse and reduces the technical requirements of greenhouse managers. The utility model uses solar thermal energy to lift the film ventilation holes for ventilation, and does not use other external power sources and equipment, which belongs to the technology of reducing consumption and emission;

[0011] 2) Compared with the film greenhouse with artificial cover, the utility model can 2 The greenhouse can save at least 2 hours of man-hours of uncovering time every day, and the temperature control effect is better than that of manual operation.

[0012] 3) The volume of the film greenhouse of the utility model increases by more than 3 times under the sun, and the ventilation holes are evenly distributed. The climate conditions in the greenhouse are significantly better than those of traditional film greenhouses of the same size;

[0013] 4) The utility model is easy to implement and can be implemented in a simple manner without the need for professional technicians to operate and implement it;

[0014] 5) The utility model has a simple structure and is less prone to failure than electrical automation greenhouses, maintaining the stability and reliability of implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0016] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of an embodiment;

[0017] Figure 3 yes Figure 1 A schematic diagram of the structure of the film cover after floating in the embodiment;

[0018] Figure 4 yes Figure 1 A schematic diagram of the three-dimensional structure of the film cover after floating in the embodiment.

[0019] In the figure, 1, arch shed; 2, film cover; 3, ground of gap part; 4, floating part; 5, ventilation hole; 6, central axis. DETAILED DESCRIPTION

[0020] Reference Figures 1 to 4The present embodiment is a film greenhouse that uses sunlight to automatically control temperature, including an arch shed 1 and a film cover 2. The film cover covers two adjacent arch sheds, and the film cover is fixed on the top or periphery of the skeleton of the two arch sheds to form a covering structure of the film greenhouse; the film cover is provided with a floating part 4 corresponding to the ground 3 of the gap between the two arch sheds, and the floating part is provided with a plurality of ventilation holes 5 for air convection with the outside of the arch shed; the floating part of the film cover forms a sinking or floating structure through the buoyancy of the temperature difference between the inside and outside of the film greenhouse, and when the floating part sinks, the ventilation holes are close to the two The ground in the gap between the arch sheds constitutes a heat-raising and heat-storing structure for the film greenhouse; when the temperature difference inside and outside the film greenhouse causes the floating part to float, the ventilation holes are separated from the ground in the gap between the two arch sheds, so that the airflow inside and outside the film greenhouse is exchanged to form a cycle with balanced thermal buoyancy, forming an automatic temperature control structure for the film greenhouse; the ventilation holes are arranged on the central axis 6 between the two arch sheds, and the diameter of the ventilation holes is 15~60mm. A number of temperature difference control weights can be arranged on the floating part, and the temperature difference of the film greenhouse can be controlled by the weights arranged on the floating part.

[0021] The utility model, such as Figure 1 , Figure 2 As shown, only the film cover 2 is shown. When the sunlight is not strong enough, the temperature of the hot air in the arch shed can only be within 10°C higher than that outside the shed. The ventilation hole in the middle of the plastic film is close to the ground between the two arch sheds. At this time, the slightly higher temperature air in the shed cannot form convection with the cold air outside the shed, preventing the heat in the shed from diffusing. Figure 3 , Figure 4 As shown, the arch shed 1 and the film cover 2 are schematically shown. When the sunlight is strong, the temperature in the film greenhouse will quickly rise by 10°C higher than that outside. The film in the middle of the two arches will float up to a level higher than the top of the two film arches under the action of the hot air. At the same time, the ventilation holes reserved in the middle of the film will also float up. The hot air in the film greenhouse will form a convection exchange with the cold air outside to achieve the purpose of ventilation and cooling. The hot air in the plastic film greenhouse pushes the film to float up and down, and the temperature in the greenhouse becomes a thermal buoyancy lift balance. The temperature inside the greenhouse is always kept 5~10°C higher than that outside the greenhouse.

[0022] The utility model can open as many ventilation holes as possible without affecting the strength of the entire film. It is best to use an anti-atomization drip film for the film cover, because the non-drip film will gather small water droplets and increase the weight of the film, thereby affecting the film's upward buoyancy. If the film is too thin, it is not conducive to opening ventilation holes for ventilation. If the film is too thick, it will affect the ventilation holes for floating ventilation and heat dissipation, thereby affecting the temperature control effect of the film greenhouse.

[0023] In the utility model, the film cover covering two adjacent arch sheds is a whole film, which is close to the ground around, and the film in the middle part of the film cover can move up and down. Under the condition that the film strength and the sealing of the greenhouse are not affected, more ventilation holes can be opened to facilitate high-temperature ventilation and heat dissipation. When it is sunny during the day, the temperature inside the plastic greenhouse will quickly be more than 10°C higher than that outside the greenhouse. The air in the greenhouse will expand and become thinner and rise due to thermal expansion, and the film cover will be like a nearly semi-cylindrical hot air balloon buckled on the ground. The central axis of the film with ventilation holes will float to a height higher than the greenhouse frames on both sides, and the hot air in the greenhouse will be discharged upward from the ventilation holes. At the same time, the cold air outside the greenhouse will flow into the greenhouse through the ventilation holes. In this way, the hot and cold air inside and outside are exchanged by convection, so that the temperature inside the greenhouse is kept between 5 and 10°C higher than that outside the greenhouse. On rainy days or at night, the temperature inside the greenhouse is less than 10℃ higher than that outside the greenhouse, which is not enough to support the ventilation holes on the central axis to ventilate and dissipate heat to the outside. The ventilation holes are close to the ground in the gap between the two arch sheds, thus retaining the heat and temperature in the greenhouse for heat storage and insulation.

[0024] The utility model can also add several heavy objects, such as sandbags, on the central axis to prevent the ventilation holes in the central axis from rising to ventilate and dissipate heat, thereby achieving the purpose of obtaining a higher temperature in the greenhouse than in the greenhouse. The greenhouses of the present invention can be arranged side by side or in series. Since the overall benefit of series arrangement is not higher than that of side by side, the series arrangement will not be described in detail.

Claims

1. A film greenhouse that uses sunlight to automatically control temperature, comprising an arch shed (1) and a film cover (2), characterized in that: The film cover covers two adjacent arch sheds, and the film cover is fixed on the top or periphery of the framework of the two arch sheds to form a covering structure of the film shed; The film cover is provided with a floating portion (4) corresponding to the ground (3) in the gap between the two arch sheds, and the floating portion is provided with a plurality of ventilation holes (5) for air convection with the outside of the arch shed; The floating part of the film cover forms a sinking or floating structure through the buoyancy of the temperature difference inside and outside the film greenhouse. When the floating part sinks, the ventilation holes are close to the ground in the gap between the two arch greenhouses, forming a temperature-raising and heat-storage structure of the film greenhouse; when the temperature difference inside and outside the film greenhouse causes the floating part to float, the ventilation holes are separated from the ground in the gap between the two arch greenhouses, so that the air flow exchange inside and outside the film greenhouse forms a cycle with balanced thermal buoyancy, forming an automatic temperature control structure of the film greenhouse.

2. The film greenhouse with automatic temperature control using sunlight according to claim 1 is characterized in that: The ventilation holes are arranged on the central axis (6) between the two corresponding arch sheds.

3. The film greenhouse with automatic temperature control by sunlight according to claim 1 is characterized in that: The diameter of the ventilation hole is 15-60 mm.

4. The film greenhouse with automatic temperature control by sunlight according to claim 1 is characterized in that: A plurality of temperature difference control weights are arranged on the floating part.

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