Disaster prevention and temperature control facility agricultural greenhouse based on old shed reconstruction

Abstract

The application belongs to the technical field of agricultural greenhouse, and particularly relates to a disaster prevention and temperature control facility agricultural greenhouse based on old greenhouse reconstruction, which comprises an inner greenhouse, and an outer greenhouse is additionally arranged outside the inner greenhouse, the top and bottom of the outer greenhouse are respectively provided with a first upper ventilation opening and a first lower ventilation opening, and the first upper ventilation opening and the first lower ventilation opening respectively have the freedom of opening and closing. The inner greenhouse is reconstructed by additionally arranging the outer greenhouse without removing the original inner greenhouse, an outer heat exchange channel is formed between the inner greenhouse and the outer greenhouse, the outer heat exchange channel can block the direct conduction of inner and outer heat, the infiltration of external heat into the inner greenhouse is reduced in summer, the heat loss of the inner greenhouse is reduced in winter, and therefore the heat preservation and insulation performance of the whole greenhouse is improved.

Description

Technical Field

[0001] This invention belongs to the field of agricultural greenhouse technology, specifically relating to an agricultural greenhouse based on the renovation of an old greenhouse for disaster prevention and temperature control. Background Technology

[0002] Agricultural greenhouses, as an important carrier of modern agricultural production, can effectively resist the impact of changes in the natural environment on crop growth and improve crop yield and quality, and are widely used in agricultural production. However, there are a large number of old agricultural greenhouses in my country that have been in use for a long time. These old greenhouses are limited by the original design standards and construction technology, and have significant defects in structural rationality and functional integrity.

[0003] Firstly, older greenhouses generally use a single-layer structure, which has poor insulation performance, making them particularly prone to being cold in winter and hot in summer. During the high temperatures of summer, the poor insulation of a single-layer greenhouse allows heat to easily accumulate inside and is difficult to dissipate quickly, causing the temperature inside the greenhouse to far exceed the suitable growth range for crops, leading to problems such as crop wilting and the proliferation of pests and diseases. In the low temperatures of winter, the greenhouse's insulation capacity is insufficient, and heat loss is rapid. Even with traditional heating equipment, it is difficult to maintain a stable and suitable temperature, which not only increases energy costs but also affects the crop growth cycle and yield.

[0004] Secondly, the roofs of older greenhouses are often designed with gentle slopes, making them prone to snow accumulation after winter snowfall. This snow cover not only blocks sunlight, leading to insufficient light inside the greenhouse and affecting crop photosynthesis, but also poses a safety risk of collapse if the weight of the snow exceeds the original load-bearing capacity of the old greenhouse. Furthermore, frozen snow can cause the curtains at the ventilation openings to stick together and become difficult to roll up, directly affecting ventilation and insulation operations in the old greenhouse. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides an agricultural greenhouse based on the renovation of an old shed. Without removing the original inner shed, the inner shed is modified by adding an outer shed, forming an external heat exchange channel between the inner and outer sheds. This external heat exchange channel can block the direct conduction of heat between the inside and outside, reducing the penetration of external heat into the inner shed in summer and reducing the loss of heat from the inner shed in winter, thereby improving the overall heat preservation and insulation performance of the greenhouse.

[0006] The specific technical solution adopted in this invention is as follows: An agricultural greenhouse based on the renovation of an old shed for disaster prevention and temperature control includes an inner shed, and an outer shed covering the inner shed is added to the outside of the inner shed. The top and bottom of the outer shed are respectively provided with a first upper ventilation opening and a first lower ventilation opening, and the first upper ventilation opening and the first lower ventilation opening are respectively free to open and close.

[0007] Curtains are provided at the first upper ventilation opening and the first lower ventilation opening respectively, and the ends of the curtains have the freedom to be rolled up by means of a roller shutter.

[0008] The outer shed and the inner shed are spaced apart, and the gap between the outer shed and the inner shed forms an external heat exchange channel. Outside air enters the external heat exchange channel from the first lower vent and is discharged along the first upper vent. The surface of the inner shed is cooled by air exchange through the external heat exchange channel.

[0009] The top and bottom of the inner shed are respectively provided with a second upper vent and a second lower vent. The second upper vent and the second lower vent have the freedom to open and close. The space between the second upper vent and the second lower vent in the inner shed forms an inner heat exchange channel. The projections of the first upper vent and the second upper vent in the vertical direction coincide. Outside air enters the outer heat exchange channel and the inner heat exchange channel through the first lower vent and the second lower vent, respectively. The heat exchange gas in the inner heat exchange channel gathers with the heat exchange gas in the outer heat exchange channel through the second upper vent and is discharged together through the first upper vent.

[0010] The ground inside the inner shed is excavated with planting pits for planting crops, and the depth of the planting pits is not less than 1m.

[0011] A heater is installed at the ground level above the planting pit in the inner shed. The heat generated by the heater enters the external heat exchange channel through the second upper vent and returns to the inner shed through the second lower vent to form a heat cycle. The surface of the outer shed is heated by the heat flow in the external heat exchange channel.

[0012] The roof of the outer canopy has an arc-shaped structure, and the angle between the tangent at any position on the roof of the outer canopy and the horizontal plane of the ground where the outer canopy is located is not less than 30°.

[0013] The outer walls of the outer canopy located on both sides of the first upper ventilation opening are respectively provided with sealing covers. The sealing covers are L-shaped structures. One end of the sealing cover is fixedly connected to the outer wall of the outer canopy, and the other end of the sealing cover covers the gap between the curtain at the first upper ventilation opening and the outer wall.

[0014] A sprinkler is installed above the inner shed inside the outer shed. The surface of the inner shed is cooled by the spray from the sprinkler. A water collection channel is installed on the ground outside the inner shed. The water collection channel is connected to the bottom of the inner shed roof. The spray water flowing down the surface of the inner shed is collected by the water collection channel and pumped to the water inlet of the sprinkler to form a cooling water circulation.

[0015] The beneficial effects of this invention are: 1. In this invention, the inner shed is modified by adding an outer shed without removing the original inner shed. An external heat exchange channel is formed between the inner and outer sheds. The external heat exchange channel can block the direct conduction of heat between the inside and outside, reduce the penetration of external heat into the inner shed in summer, and reduce the heat loss of the inner shed in winter, thereby improving the overall heat preservation performance of the greenhouse.

[0016] When the crops in the inner greenhouse need to be kept warm, close the first upper vent and the first lower vent to seal the external heat exchange channel. The air in the external heat exchange channel forms an insulation layer to prevent heat loss from the inner greenhouse. When the crops in the inner greenhouse need to be cooled, open the first upper vent and the first lower vent. Utilize the chimney effect of rising hot air and replenishing cold air to form natural convection, accelerate the airflow in the external heat exchange channel, and remove the heat conducted from the surface of the inner greenhouse.

[0017] 2. The inner and outer double-layer heat exchange channels in this invention produce a synergistic effect, improving the cooling efficiency and cooling effect of the inner shed. Cold air enters from the first lower vent, with part of it entering the outer heat exchange channel for heat exchange, and the other part entering the inner heat exchange channel of the inner shed, where it directly mixes and exchanges heat with the hot air inside the shed. The hot air rises to the second upper vent. Simultaneously, because the vertical projections of the first and second upper vents overlap, the hot air from the two channels converges at the first upper vent, forming a superimposed upward airflow, increasing the exhaust speed of the hot air, and thus accelerating the replenishment of cold air in the inner and outer heat exchange channels. This creates a highly efficient chimney effect with dual inlets and single outlets, further improving heat exchange efficiency.

[0018] 3. In this invention, a heater is used to create heat preservation and snow removal. The first upper and lower vents of the outer canopy are closed, while the second upper and lower vents of the inner canopy are opened. The heater, aided by an air pump, draws in outside air, heats it, and sends it into the inner canopy to form a heat flow. The heat flow rises to the second upper vent, enters the external heat exchange channel, flows downwards along the inner wall of the outer canopy roof, and then returns to the inner canopy through the second lower vent, forming a heating cycle between the inner canopy and the external heat exchange channel. As the heat flow flows within the external heat exchange channel, it conducts heat with the inner wall of the outer canopy, raising the temperature of the outer canopy wall. This causes the snow on the roof to melt and slide off quickly upon contact with the wall, preventing snow accumulation. Simultaneously, the melted snow does not freeze on the vent curtains, ensuring the vents can open and close normally. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a top view of the exterior canopy structure. In the attached diagram, 1 is the inner greenhouse, 2 is the outer greenhouse, 3 is the first upper vent, 4 is the first lower vent, 5 is the second upper vent, 6 is the second lower vent, 7 is the planting pit, 8 is the heater, 9 is the sealing cover, 10 is the sprinkler, 11 is the water collection channel, 12 is the roller shutter, and 13 is the curtain. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: Specific embodiments, such as Figure 1-2 As shown, the present invention provides an agricultural greenhouse based on the renovation of an old shed for disaster prevention and temperature control, including an inner shed 1, and an outer shed 2 that covers the inner shed 1 on the outside. The top and bottom of the outer shed 2 are respectively provided with a first upper ventilation opening 3 and a first lower ventilation opening 4, and the first upper ventilation opening 3 and the first lower ventilation opening 4 are respectively free to open and close.

[0021] Currently, older greenhouses generally use a single-layer structure, which has poor insulation performance, resulting in particularly prominent problems of being cold in winter and hot in summer. During the high temperatures of summer, the poor insulation of the single-layer structure causes heat to accumulate inside the greenhouse and is difficult to dissipate quickly, leading to temperatures far exceeding the suitable growth range for crops and causing problems such as crop wilting and the proliferation of pests and diseases. In the low temperatures of winter, the greenhouse structure has insufficient insulation capacity, and heat loss is rapid. Even with traditional heating equipment, it is difficult to maintain a stable and suitable temperature, which not only increases energy costs but also affects the crop growth cycle and yield.

[0022] Therefore, in this invention, without removing the original inner shed 1, the inner shed 1 is modified by adding an outer shed 2. An external heat exchange channel is formed between the inner shed 1 and the outer shed 2. The external heat exchange channel can block the direct conduction of heat between the inside and outside, reduce the penetration of external heat into the inner shed 1 in summer, and reduce the heat loss of the inner shed 1 in winter, thereby improving the overall heat preservation and insulation performance of the greenhouse.

[0023] When the crops in the inner shed 1 need to be kept warm, the first upper vent 3 and the first lower vent 4 are closed to seal the external heat exchange channel. The air in the external heat exchange channel forms an insulation layer to prevent heat loss from the inner shed 1. When the crops in the inner shed 1 need to be cooled, the first upper vent 3 and the first lower vent 4 are opened. The chimney effect of rising hot air and replenishing cold air is used to form natural convection, which accelerates the air flow in the external heat exchange channel and removes the heat conducted from the surface of the inner shed 1.

[0024] In addition, the outer shed 2 serves as an independent structure to bear the loads of snow accumulation and rainfall, thus preventing the old shed from collapsing due to excessive load.

[0025] The outer shed 2 and the inner shed 1 are spaced apart, and the gap between the outer shed 2 and the inner shed 1 forms an external heat exchange channel. Outside air enters the external heat exchange channel from the first lower vent 4 and is discharged along the first upper vent 3. The surface of the inner shed 1 is cooled by air exchange through the external heat exchange channel.

[0026] The spacing between the outer shed 2 and the inner shed 1 forms an external heat exchange channel with bottom inlet and top outlet. After the cold air enters the external heat exchange channel from the first lower vent 4, it flows along the surface of the inner shed 1 and exchanges heat with the surface of the inner shed 1. The heat inside the inner shed 1 is transferred to the surface through heat conduction and absorbed by the cold air. The density of the heated air decreases after absorbing heat, and it rises rapidly along the channel and is discharged from the first upper vent 3, forming a continuous and stable natural heat exchange cycle, achieving energy-free cooling and reducing the cost of cooling the old shed in summer.

[0027] The top and bottom of the inner shed 1 are respectively provided with a second upper vent 5 and a second lower vent 6. The second upper vent 3 and the second lower vent 4 have degrees of freedom to open and close. The space between the second upper vent 5 and the second lower vent 6 in the inner shed 1 forms an inner heat exchange channel. The projections of the first upper vent 3 and the second upper vent 5 in the vertical direction coincide. Outside air enters the outer heat exchange channel and the inner heat exchange channel through the first lower vent 4 and the second lower vent 6, respectively. The heat exchange gas in the inner heat exchange channel converges with the heat exchange gas in the outer heat exchange channel through the second upper vent 5 and is discharged together through the first upper vent 3.

[0028] The inner and outer double-layer heat exchange channels work synergistically to improve the cooling efficiency and effect of the inner shed 1. Cold air enters from the first lower vent 4, with some entering the outer heat exchange channel for heat exchange, and the rest entering the inner heat exchange channel of the inner shed 1 to directly mix and exchange heat with the hot air inside. The hot air rises to the second upper vent 5. Simultaneously, because the vertical projections of the first upper vent 3 and the second upper vent 5 overlap, the hot air from the two channels converges at the first upper vent 3, forming a superimposed upward airflow. This increases the exhaust speed of the hot air, thereby accelerating the replenishment of cold air in the inner and outer heat exchange channels, creating a highly efficient chimney effect with dual inlets and single outlets, further improving heat exchange efficiency.

[0029] The ground inside the inner shed 1 is excavated with planting pits 7 for planting crops, and the depth of the planting pits 7 is not less than 1m.

[0030] Deep underground, the soil is less affected by surface temperature fluctuations, and the soil in planting pit 7 is in direct contact with the underground constant temperature layer, allowing the crop roots to grow in a stable ground temperature environment.

[0031] A heater 8 is installed at the ground level above the planting pit 7 in the inner shed 1. The heat generated by the heater 8 enters the external heat exchange channel from the second upper vent 5 and returns to the inner shed 1 along the second lower vent 6 to form a heat cycle. The surface of the outer shed 2 is heated by the heat flow in the external heat exchange channel.

[0032] When the crops in the inner shed 1 require heat preservation, the first upper vent 3 and the first lower vent 4 of the outer shed 2 are closed, and the second upper vent 5 and the second lower vent 6 of the inner shed 1 are opened. The heater 8 uses an air pump to draw in outside air, heats it, and sends it to the inner shed 1 to form a heat flow. The heat flow rises to the second upper vent 5, enters the external heat exchange channel, flows down along the inner wall of the roof of the outer shed 2, and then returns to the inner shed 1 from the second lower vent 6, forming a heating cycle between the inner shed 1 and the external heat exchange channel. When the heat flows in the outer heat exchange channel, it conducts heat with the inner wall of the outer shed 2, raising the temperature of the outer shed 2 wall surface. This causes the snow on the roof to melt and slide off quickly after contacting the wall surface, preventing snow accumulation. At the same time, the melted snow water will not freeze on the vent curtains, ensuring that the vents can open and close normally. The cold air formed after the heat exchange with the outer shed 2 sinks and re-enters the inner shed 1 through the second lower vent 6. However, due to the heating of the heater 8 and the fact that the crop is located deep in the planting pit 7, the cold air is reheated by the heater 8 before it sinks to the level of the crop.

[0033] The roof of the outer canopy 2 has an arc-shaped structure, and the angle between the tangent at any position of the roof of the outer canopy 2 and the horizontal plane of the ground where the outer canopy 2 is located is not less than 30°.

[0034] The angle between the tangent of the arched roof and the horizontal plane is ≥30°. This angle prevents snow from adhering under the influence of gravity and causes it to slide off naturally, thus avoiding the accumulation of a large amount of snow on the roof of the outer canopy 2 and exceeding its load-bearing capacity.

[0035] Sealing covers 9 are respectively provided on the outer walls of the outer canopy 2 on both sides of the first upper ventilation opening 3. The sealing covers 9 have an L-shaped structure. One end of the sealing cover 9 is fixedly connected to the outer wall of the outer canopy 2, and the other end of the sealing cover 9 covers the gap between the curtain at the first upper ventilation opening 3 and the outer wall.

[0036] When the vent is closed, a small gap is easily formed between the curtain and the outer wall of the outer canopy 2, which can easily lead to heat loss in the external heat exchange channel. Therefore, a sealing cover 9 is added. The sealing cover 9 and the roof of the outer canopy 2 together hold the curtain to block cold air from entering the external heat exchange channel through the gap, so as to avoid damaging the heat preservation effect of the external heat exchange channel.

[0037] In addition, the sealing cover 9 is provided with an opening for the end of the roller shutter 12 to pass through, that is, the end of the roller shutter 12 moves inside the sealing cover 9.

[0038] A sprinkler 10 is installed above the inner shed 1 inside the outer shed 2. The surface of the inner shed 1 is cooled by the spray from the sprinkler 10. A water collection channel 11 is installed on the ground outside the inner shed 1. The water collection channel 11 is connected to the bottom of the roof of the inner shed 1. The spray water flowing down the surface of the inner shed 1 is collected by the water collection channel 11 and pumped to the water inlet of the sprinkler 10 to form a cooling water circulation.

[0039] Sprayer 10 sprays water onto the surface of the inner shed 1. As the water passes over the surface of the inner shed 1, it absorbs a large amount of heat, rapidly reducing the temperature of the inner shed 1 wall and thus lowering the temperature of the interior space. Simultaneously, the water mist adhering to the surface of the inner shed 1 vaporizes, carrying a large amount of heat along with the heat exchange gas in the external heat exchange channel and being discharged through the first upper vent 3. Furthermore, because the water collection channel 11 is located near the second lower vent 6, the cold air entering the internal heat exchange channel also cools the water in the water collection channel 11, thus achieving cooling water circulation.

Claims

1. An agricultural greenhouse based on the renovation of an old shed, comprising an inner shed (1), characterized in that, An outer canopy (2) covering the inner canopy (1) is added to the outside of the inner canopy (1). The top and bottom of the outer canopy (2) are respectively provided with a first upper ventilation opening (3) and a first lower ventilation opening (4). The first upper ventilation opening (3) and the first lower ventilation opening (4) have degrees of freedom to open and close. The outer shed (2) and the inner shed (1) are spaced apart. The gap between the outer shed (2) and the inner shed (1) forms an external heat exchange channel. Outside air enters the external heat exchange channel from the first lower vent (4) and is discharged along the first upper vent (3). The surface of the inner shed (1) is cooled by air exchange through the external heat exchange channel. The top and bottom of the inner shed (1) are respectively provided with a second upper vent (5) and a second lower vent (6). The second upper vent (5) and the second lower vent (6) have degrees of freedom to open and close. The space between the second upper vent (5) and the second lower vent (6) in the inner shed (1) forms an inner heat exchange channel. The projection of the first upper vent (3) and the second upper vent (5) in the vertical direction coincides. Outside air enters the outer heat exchange channel and the inner heat exchange channel through the first lower vent (4) and the second lower vent (6) respectively. The heat exchange gas in the inner heat exchange channel gathers with the heat exchange gas in the outer heat exchange channel through the second upper vent (5) and is discharged together through the first upper vent (3). The ground inside the inner shed (1) is excavated with planting pits (7) for planting crops, and the depth of the planting pits (7) is not less than 1m. A heater (8) is installed in the inner shed (1) at the ground level above the planting pit (7). The heat flow generated by the heater (8) enters the external heat exchange channel from the second upper vent (5) and returns to the inner shed (1) along the second lower vent (6) to form a heat cycle. The surface of the outer shed (2) is heated by the heat flow in the external heat exchange channel. A sprayer (10) is installed above the inner shed (1) inside the outer shed (2). The surface of the inner shed (1) is cooled by the spraying of the sprayer (10). A water collection channel (11) is installed on the ground outside the inner shed (1). The water collection channel (11) is connected to the bottom of the roof of the inner shed (1). The spray water flowing down the surface of the inner shed (1) is collected by the water collection channel (11) and pumped to the water inlet of the sprayer (10) to form a cooling water circulation.

2. The agricultural greenhouse based on the renovation of an old shed, characterized in that, The roof of the outer canopy (2) has an arc-shaped structure, and the tangent at any position of the roof of the outer canopy (2) forms an angle of not less than 30° with the horizontal plane of the ground where the outer canopy (2) is located.

3. The agricultural greenhouse based on the renovation of an old shed, characterized in that, The outer walls of the outer canopy (2) located on both sides of the first upper ventilation opening (3) are respectively provided with sealing covers (9). The sealing covers (9) are L-shaped structures. One end of the sealing cover (9) is fixedly connected to the outer wall of the outer canopy (2), and the other end of the sealing cover (9) covers the gap between the curtain at the first upper ventilation opening (3) and the outer wall.

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