A circulating risk control temperature-controlled greenhouse system and its temperature control method

Abstract

The present invention discloses a circulating air control and temperature control greenhouse system, which includes a main greenhouse, a temperature adjustment greenhouse, a return air chamber, a wet curtain, an air-conditioning coil, and a circulating pipeline. A bracket for placing potted plants is arranged in the main greenhouse. The temperature adjustment greenhouse is arranged below the outer side of the long-side wall of the main greenhouse, and the return air chamber is arranged in the temperature adjustment greenhouse. The circulating pipeline includes multiple groups of parallel circulating units. Each circulating unit includes an air outlet pipe, a return air inlet pipe, and a return air pipe. The air outlet pipe is arranged at the top of the main greenhouse, and a fan for guiding air and multiple air distribution holes for air outlet are arranged on the air outlet pipe. The root of the air outlet pipe is connected to the temperature adjustment greenhouse through a vertical air guiding pipe. The return air inlet pipe is arranged in the main greenhouse and at the end far from the temperature adjustment greenhouse, and the root of the return air inlet pipe is connected to the return air chamber through an underground laid return air pipe. A wet curtain and an air-conditioning coil are arranged at the air outlet of the return air chamber. The circulating air control and temperature control greenhouse system and its temperature control method of the present invention can increase the uniform flow and circulation of air in the greenhouse through the setting of the circulating pipeline, and the temperature controllability in the greenhouse is good.

Description

Technical Field

[0001] The invention relates to the technical field of temperature control in a flower greenhouse, and in particular to a circulating air temperature control greenhouse system and a temperature control method thereof. Background Art

[0002] In current horticultural production, greenhouses have become an essential basic facility for flower cultivation. The production process of greenhouse flower cultivation is basically carried out under artificially controlled environment and is less affected by natural conditions, especially changes in external meteorological conditions. That is, a good microclimate can be maintained inside the greenhouse to create the most suitable environmental conditions for flower growth.

[0003] In existing orchid cultivation greenhouses, the temperature control management is relatively extensive. When the temperature is low, multiple built-in heating pipes are often used for heating. When the temperature is high, fans and wet curtains are mostly used for cooling. This temperature control method often has hysteresis, slow air flow in the greenhouse, and uneven temperature distribution, which affects the normal growth of orchid seedlings.

[0004] Therefore, it is necessary to develop a circulating air temperature-controlled greenhouse system and a temperature control method thereof. Summary of the invention

[0005] The purpose of the present invention is to provide a circulating air temperature-controlled greenhouse system, which can increase the uniform flow and circulation of air in the greenhouse through the arrangement of a circulating pipeline, and the temperature in the greenhouse is well controllable, which is conducive to the cultivation and growth of flowers.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention discloses a circulating air temperature-controlled greenhouse system, comprising a main greenhouse, a temperature-controlled greenhouse, a return air chamber, a wet curtain, an air-conditioning coil and a circulating duct, wherein a bracket for placing potted plants is arranged in the main greenhouse, the temperature-controlled greenhouse is arranged below the outer side of the long side wall of the main greenhouse, and the return air chamber is arranged in the temperature-controlled greenhouse; the circulating duct comprises a plurality of groups of circulating units arranged in parallel, and the circulating units comprise an air outlet duct, a return air inlet duct and a return air duct, the air outlet duct is arranged at the top of the main greenhouse, an air-inducing fan and a plurality of air outlet holes are arranged on the air outlet duct, and the root of the air outlet duct is connected to the temperature-controlled greenhouse through a vertical air-inducing duct; the return air inlet duct is arranged in the main greenhouse and away from one end of the temperature-controlled greenhouse, the root of the return air inlet duct is connected to the return air chamber through the return air duct laid underground, and the air outlet of the return air chamber is provided with the wet curtain and the air-conditioning coil.

[0008] Furthermore, the return air duct includes a first return air duct, the first return air duct is wrapped with a thermal insulation layer, and a first drain pipe for discharging condensed water is arranged at the bottom of the first return air duct.

[0009] Further, the return air duct further includes a second return air duct arranged in parallel with the first return air duct. The second return air duct is located below the first return air duct and its buried depth is not less than two meters. A first valve is provided at the air inlet end of the first return air duct, a second valve is provided at the air inlet end of the second return air duct, and a second drain pipe for discharging condensed water is provided at the bottom of the second return air duct.

[0010] Further, the second return air duct is specifically made of stainless steel pipe or galvanized steel pipe, and heat dissipation fins are provided on the outer wall of the second return air duct.

[0011] Further, the outer side wall of the return air chamber is made of a heat-insulating wall, and the heat-insulating wall also serves as the side wall of the temperature control chamber.

[0012] Further, a skylight for introducing fresh air is provided on the top wall of the temperature control chamber, and a maintenance door is provided on the long side wall between the temperature control chamber and the main greenhouse.

[0013] Further, it also includes an exhaust duct and a heat pump room. The exhaust duct is buried underground at the root of the return air inlet pipe and is communicated with the return air duct. The air outlet of the exhaust duct is arranged in the heat pump room, and an air source heat pump is provided in the heat pump room. The hot end of the air source heat pump is communicated with the air-conditioning coil.

[0014] Further, an indoor light-shielding curtain is provided above the interior of the main greenhouse, and an outdoor light-shielding curtain is provided above the exterior of the main greenhouse.

[0015] The present invention also discloses a temperature control method for a circulating air control temperature greenhouse system. By using the temperature control of the circulating air control temperature greenhouse system described in any one of the above, a temperature control chamber is arranged on one side of the main greenhouse. After introducing the return air into the temperature control chamber through the circulating pipeline for temperature adjustment, it then circulates and is evenly distributed into the main greenhouse.

[0016] Further, a part of the exhaust air flowing in a cycle is introduced into the cold end of the air source heat pump to make full use of the waste heat of the exhaust gas.

[0017] Compared with the prior art, the beneficial technical effects of the present invention are:

[0018] The present invention relates to a circulating air control and temperature control greenhouse system. By arranging a temperature adjustment chamber and a return air chamber on one side of the main greenhouse, the temperature adjustment link can be led out of the main greenhouse, reducing the occupation of the indoor cultivation space, avoiding local overheating or overcooling, and achieving overall uniform circulating air distribution, making the temperature more uniform. By laying the return air pipe underground, it avoids occupying the cultivation space, does not affect the integrity of the ground in the greenhouse, and is convenient for passage. Through the setting of the wet curtain and the air-conditioning coil, it is convenient to take away or add heat. The circulating air control and temperature control greenhouse system of the present invention can increase the uniform flow and circulation of the air in the greenhouse through the setting of the circulating pipeline, has good controllability of the temperature in the greenhouse, and is beneficial to the cultivation and growth of flowers.

[0019] In addition, by wrapping a heat insulation layer outside the first return air pipe, the heat exchange between the return air and the surrounding soil during passage can be reduced, avoiding heat loss in the cold season. Through the setting of the first drain pipe, it is convenient to discharge the condensed water formed during the passage of the return air flow, avoiding pipe blockage. Through the setting of the second return air pipe, in the hot summer, when the return air passes through the second return air pipe, it can transfer heat to the surrounding soil and then dissipate to the ground, achieving preliminary cooling. After returning to the return air chamber again, it is cooled twice by the wet curtain, with a significant cooling effect and energy saving in refrigeration. Through the setting of the heat dissipation fins, the heat dissipation fins are fully in contact with the surrounding soil, increasing the heat dissipation area and improving the heat exchange effect. By setting the outer side wall of the return air chamber as a heat insulation wall, it is convenient to reduce heat or cold loss and ensure the temperature control effect. Through the setting of the skylight, fresh air can be introduced. The fresh air is preliminarily mixed with the return air after temperature adjustment in the temperature adjustment chamber and mixed again in the vertical air induction pipe, avoiding the temperature impact of overheated or overcooled fresh air on the potted plants. Through the setting of the exhaust pipe, part of the return air to be discharged is introduced into the heat pump room, increasing the air temperature around the cold end of the air source heat pump, improving the operating efficiency of the air source heat pump, and discharging the waste heat after repeated utilization, improving the energy utilization efficiency. Through the setting of the inner light-shielding curtain and the outer light-shielding curtain, in sunny weather, double shading is carried out to avoid the rapid temperature rise of the main greenhouse after being irradiated by sunlight, and at the same time, to block the strong light from burning the potted plants.

[0020] The temperature control method of the circulating air control and temperature control greenhouse system of the present invention, through the way of circulating air distribution and adjusting the return air temperature outside the main greenhouse, ensures the temperature control accuracy and uniformity. By deeply burying the return air pipe, the relatively hot return air is preliminarily cooled by the earth, reducing the working load of the water curtain cooling and saving energy. By leading the waste exhaust air to the cold end of the air source heat pump and discharging the waste heat after utilization, further energy is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the drawings.

[0022] Figure 1It is a top - down plan schematic diagram of the circulating air - control temperature greenhouse system of the present invention;

[0023] Figure 2 is Figure 1 the schematic diagram of the A - A elevation in

[0024] Figure 3 It is an enlarged schematic diagram of the greenhouse temperature - regulating part of the present invention.

[0025] Explanation of reference numerals: 1, main greenhouse; 101, long - side wall; 102, inspection door; 2, greenhouse temperature - regulating room; 201, skylight; 3, heat - pump room; 4, air outlet pipe; 401, vertical air - guiding pipe; 402, air - distributing hole; 403, fan; 5, return air inlet pipe; 501, filter; 6, first return air pipe; 601, first drain pipe; 602, first valve; 7, second return air pipe; 701, second valve; 702, fin; 703, second drain pipe; 8, return air chamber; 801, heat - insulating wall; 9, wet curtain; 10, air - conditioner pipe; 11, exhaust pipe; 12, indoor light - shading curtain; 13, outdoor light - shading curtain; 14, bracket; 15, potted plant. Detailed implementation manners

[0026] The core of the present invention is to provide a circulating air - control temperature greenhouse system and its temperature - control method. Through the setting of the circulating pipeline, the uniform flow and circulation of the air in the greenhouse can be increased, the temperature controllability in the greenhouse is good, which is beneficial to the cultivation and growth of flowers.

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0029] Referring to the accompanying drawings, Figure 1 It is a top - down plan schematic diagram of the circulating air - control temperature greenhouse system of the present invention;

[0030] Figure 2 is Figure 1 the schematic diagram of the A - A elevation in Figure 3 It is an enlarged schematic diagram of the greenhouse temperature - regulating part of the present invention.

[0031] In a specific embodiment, as Figures 1 to 3 shown, the cyclic risk control and temperature control greenhouse system of the present invention includes a main greenhouse 1, a temperature adjustment greenhouse 2, a return air chamber 8, a wet curtain 9, an air-conditioning coil 10, and a circulation pipeline. The main greenhouse 1 is a steel structure frame and is enclosed by covering heat-insulating boards. A plurality of neatly arranged brackets 14 are provided in the main greenhouse 1, and cultivated potted plants 15 are placed on the brackets 14. The temperature adjustment greenhouse 2 is arranged below the outer side of the long side wall 101 on one side of the main greenhouse 1, and the return air chamber 8 is arranged in the temperature adjustment greenhouse 2. The circulation pipeline includes a plurality of groups of parallel circulation units. Each circulation unit includes an air outlet pipe 4, a return air inlet pipe 5, and a return air pipe. The air outlet pipe 4 is suspended above the top of the main greenhouse 1. A fan 403 for inducing air and a plurality of air distribution holes 402 for air outlet are provided on the air outlet pipe 4. The air distribution holes 402 are evenly arranged on the air outlet pipe 4. The root of the air outlet pipe 4 is connected to the temperature adjustment greenhouse 2 through a vertical air guiding pipe 401. The return air inlet pipe 5 is vertically arranged in the main greenhouse 1 and at a position far from the temperature adjustment greenhouse 2. A filter 501 is provided at the top of the return air inlet pipe 5. The filter 501 filters the incoming return air to prevent sundries from entering the return air inlet pipe 5 and the return air pipe. The root of the return air inlet pipe 5 is connected to the return air chamber 8 through the underground-laid return air pipe. A wet curtain 9 and an air-conditioning coil 10 are provided at the air outlet of the return air chamber 8. The wet curtain 9 and the air-conditioning coil 10 are arranged along the entire length of the long side wall 101. The wet curtain 9 is used for cooling, and the air-conditioning coil 10 is used for heating the passing air.

[0032] By arranging the temperature adjustment greenhouse 2 and the return air chamber 8 on one side of the main greenhouse 1, the temperature adjustment link can be led out of the main greenhouse 1, reducing the occupation of the indoor cultivation space. At the same time, it avoids local overheating or overcooling, and the air is evenly circulated and distributed as a whole, making the temperature more uniform. By laying the return air pipe underground, it avoids occupying the cultivation space, does not affect the integrity of the ground in the greenhouse, and is convenient for passage. Through the arrangement of the wet curtain 9 and the air-conditioning coil 10, it is convenient to take away or add heat. The cyclic risk control and temperature control greenhouse system of the present invention can increase the uniform flow and circulation of the air in the greenhouse through the setting of the circulation pipeline, and the temperature in the greenhouse is well controllable, which is beneficial to the cultivation and growth of flowers.

[0033] In a specific embodiment of the present invention, as Figure 1 and Figure 2 shown, the return air pipe includes a first return air pipe 6. The first return air pipe 6 is wrapped with a heat-insulating and insulating layer, and the heat-insulating and insulating layer can be a polyurethane foam heat-insulating layer or a rock wool coating. A first drain pipe 601 for discharging condensed water is provided at the bottom of the first return air pipe 6. The first drain pipe 601 is connected to a drainage pipeline to a drainage ditch.

[0034] By wrapping a heat-insulating layer around the first return air duct 6, the heat exchange between the return air and the surrounding soil during passage can be reduced, preventing heat loss in the cold season; through the provision of the first drain pipe 601, the condensed water formed during the passage of the return air can be easily discharged, preventing pipe blockage.

[0035] In a specific embodiment of the present invention, as Figure 2 shown, the return air duct further includes a second return air duct 7 arranged in parallel with the first return air duct 6. The second return air duct 7 is located below the first return air duct 6 and the buried depth is not less than two meters. A first valve 602 is provided at the air inlet end of the first return air duct 6, and a second valve 701 is provided at the air inlet end of the second return air duct 7. Both the first valve 602 and the second valve 701 are arranged in a valve well dug on the indoor ground. A second drain pipe 703 for discharging condensed accumulated water is provided at the bottom of the second return air duct 7, and the second drain pipe 703 is connected to a drainage pipeline to a drainage ditch.

[0036] Specifically, as Figure 2 shown, the second return air duct 7 is specifically made of stainless steel pipe or hot-dip galvanized steel pipe. Heat dissipation fins 702 are provided on the outer wall of the second return air duct 7, and the heat dissipation fins 702 are in full contact with the surrounding soil.

[0037] Through the provision of the second return air duct 7, in the hot summer, when the return air passes through the second return air duct 7, heat can be transferred to the surrounding soil and dissipated to the ground, achieving preliminary cooling. After returning to the return air chamber 8 again, secondary cooling is carried out through the wet curtain 9, and the cooling effect is remarkable, and the refrigeration energy is saved; through the provision of the heat dissipation fins 702, the heat dissipation fins 702 are in full contact with the surrounding soil, increasing the heat dissipation area and improving the heat exchange effect.

[0038] In a specific embodiment of the present invention, as Figure 2 and Figure 3 shown, the outer side wall of the return air chamber 8 is made of a heat-insulating wall 801, and the heat-insulating wall 801 also serves as the side wall of the temperature adjustment chamber 2. The heat-insulating wall 801 can be built with heat-insulating board materials or formed by covering with multiple layers of hollow glass or vacuum glass plates.

[0039] Specifically, as Figure 3 shown, a skylight 201 for introducing fresh air is provided on the top wall of the temperature adjustment chamber 2, and a maintenance door 102 is provided on the long side wall 101 between the temperature adjustment chamber 2 and the main greenhouse 1.

[0040] By setting the outer side wall of the return air chamber 8 as the heat-insulating wall 801, it is convenient to reduce heat or cold loss and ensure the temperature control effect; through the provision of the skylight 201, fresh air can be introduced, and the fresh air is initially mixed with the temperature-adjusted return air in the temperature adjustment chamber 2 and mixed again in the vertical air duct 401, avoiding the temperature impact of overheated or overcooled fresh air on the potted plants 15.

[0041] In a specific embodiment of the present invention, as Figure 1 shown, the circulating air temperature control greenhouse system of the present invention further includes an exhaust duct 11 and a heat pump room 3. The exhaust duct 11 is buried underground at the root of the return air inlet pipe 5 and is communicated with the return air duct. The air outlet of the exhaust duct 11 is arranged in the heat pump room 3. An air source heat pump is arranged in the heat pump room 3, and the hot end of the air source heat pump is communicated with the air-conditioning coil 10.

[0042] Through the arrangement of the exhaust duct 11, part of the return air to be discharged is introduced into the heat pump room 3, the air temperature around the cold end of the air source heat pump is increased, the operation efficiency of the air source heat pump is improved, and the waste heat is reused and then discharged, improving the energy utilization efficiency.

[0043] In a specific embodiment of the present invention, as Figure 2 shown, an indoor light-shielding curtain 12 is arranged above the interior of the main greenhouse 1, and the indoor light-shielding curtain 12 is located above the air outlet duct 4; an outdoor light-shielding curtain 13 is arranged above the exterior of the main greenhouse 1.

[0044] Through the arrangement of the inner light-shielding curtain 12 and the outer light-shielding curtain 13, in sunny weather, double shading is carried out to prevent the temperature of the main greenhouse 1 from rising too fast after being irradiated by sunlight, and at the same time, the strong light is blocked to prevent the potted plants 15 from being burned.

[0045] The present invention also discloses a temperature control method for the circulating air temperature control greenhouse system. The temperature is controlled by using the circulating air temperature control greenhouse system in any of the above embodiments. By arranging a temperature adjustment room on one side of the main greenhouse, the return air is introduced into the temperature adjustment room through a circulating pipeline for temperature adjustment and then circulated and evenly distributed into the main greenhouse.

[0046] Specifically, part of the exhaust air flowing in a cycle is introduced to the cold end of the air source heat pump to make full use of the waste heat of the exhaust gas. Through the buried return air duct, the return air exchanges heat with the surrounding soil when passing through the return air duct to be cooled, improving the cooling effect.

[0047] By means of the circulating air distribution method and adjusting the return air temperature outside the main greenhouse, the temperature control accuracy and uniformity are ensured; through the buried return air duct, the relatively hot return air is preliminarily cooled by the earth, reducing the working load of the water curtain cooling and saving energy; by leading the waste exhaust air to the cold end of the air source heat pump and discharging the waste gas after using the waste heat, further energy is saved.

[0048] The circulating air temperature-controlled greenhouse system of the present invention, by setting a conditioning room 2 and a return air room 8 on one side of the main greenhouse 1, can lead the temperature adjustment link to the outside of the main greenhouse 1, reducing the occupation of the indoor cultivation space, while avoiding local excessively high or low temperatures, and the overall uniform circulation of air distribution, the temperature is more uniform; by laying the return air duct underground, the occupation of the cultivation space is avoided, the integrity of the ground in the greenhouse is not affected, and it is convenient to pass; by setting the wet curtain 9 and the air conditioning coil 10, it is convenient to take away or add heat. The circulating air temperature-controlled greenhouse system of the present invention, by setting the circulation pipeline, can increase the uniform flow and circulation of air in the greenhouse, the temperature in the greenhouse is well controllable, and it is conducive to the cultivation and growth of flowers. In addition, by wrapping the first return air duct 6 with a thermal insulation layer, the heat exchange between the return air and the surrounding soil can be reduced when passing through, avoiding heat loss in cold seasons; by setting the first drain pipe 601, it is convenient to discharge the condensed water formed by condensation when the return air flows through, avoiding pipeline blockage. By setting the second return air duct 7, in the hot summer, when the return air passes through the second return air duct 7, it can transfer heat to the surrounding soil and then dissipate to the earth, and perform preliminary cooling. After returning to the return air chamber 8, it is cooled again through the wet curtain 9, and the cooling effect is significant, and refrigeration energy is saved; by setting the heat dissipation fins 702, the heat dissipation fins 702 are fully in contact with the surrounding soil, increasing the heat dissipation area and improving the heat exchange effect. By setting the outer wall of the return air chamber 8 as an insulation wall 801, it is convenient to reduce heat or cold loss and ensure the temperature control effect; by setting the skylight 201, fresh air can be introduced, and the fresh air and the temperature-adjusted return air are preliminarily mixed in the temperature-controlled room 2 and mixed again in the vertical air duct 401, avoiding the temperature impact of overheated or overcooled fresh air on the potted plants 15. By setting the exhaust pipe 11, part of the return air to be discharged is introduced into the heat pump room 3, the air temperature around the cold end of the air source heat pump is increased, the operation efficiency of the air source heat pump is improved, and the waste heat is discharged after reuse, which improves the energy utilization efficiency. By setting the inner shading curtain 12 and the outer shading curtain 13, double shading is performed in strong sunny weather to prevent the main greenhouse 1 from being heated too fast after being radiated by sunlight, and at the same time block the strong light from burning the potted plants 15.

[0049] The temperature control method of the circulating air temperature-controlled greenhouse system of the present invention ensures the temperature control accuracy and uniformity by circulating air distribution and adjusting the return air temperature outside the main greenhouse; the earth is used to preliminarily cool the hot return air through a deeply buried return air duct, thereby reducing the workload of water curtain cooling and saving energy; and the waste exhaust air is led out to the cold end of the air source heat pump and the waste gas heat is discharged after being utilized, thereby further saving energy.

[0050] The embodiments described above are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A cyclic risk control and temperature control greenhouse system, characterized in that Comprising: A main greenhouse (1), a temperature-adjusting greenhouse (2), a return air chamber (8), a wet curtain (9), an air-conditioning coil (10) and a circulation pipeline. A bracket (14) for placing potted plants (15) is arranged inside the main greenhouse (1). The temperature-adjusting greenhouse (2) is arranged below the outer side of the long-side wall (101) of the main greenhouse (1). The return air chamber (8) is arranged inside the temperature-adjusting greenhouse (2). The circulation pipeline comprises a plurality of groups of parallel circulation units. Each circulation unit comprises an air outlet pipe (4), a return air inlet pipe (5) and a return air pipe. The air outlet pipe (4) is arranged at the top of the main greenhouse (1). A fan (403) for inducing air and a plurality of air distribution holes (402) for air outlet are arranged on the air outlet pipe (4). The root of the air outlet pipe (4) is connected to the temperature-adjusting greenhouse (2) through a vertical air induction pipe (401). The return air inlet pipe (5) is arranged inside the main greenhouse (1) and at the end far from the temperature-adjusting greenhouse (2). The root of the return air inlet pipe (5) is connected to the return air chamber (8) through the return air pipe laid underground. The wet curtain (9) and the air-conditioning coil (10) are arranged at the air outlet of the return air chamber (8). A skylight (201) for introducing fresh air is arranged on the top wall of the temperature-adjusting greenhouse (2). A discharge air pipe (11) is further included. The discharge air pipe (11) is buried underground at the root of the return air inlet pipe (5) and is connected to the return air pipe. The return air pipe comprises a first return air pipe (6). The first return air pipe (6) is wrapped with a heat-insulating and insulating layer. A first drain pipe (601) for discharging condensed accumulated water is arranged at the bottom of the first return air pipe (6). The return air pipe further comprises a second return air pipe (7) arranged in parallel with the first return air pipe (6). The second return air pipe (7) is located below the first return air pipe (6) and the buried depth is not less than two meters. A first valve (602) is arranged at the air inlet end of the first return air pipe (6). A second valve (701) is arranged at the air inlet end of the second return air pipe (7). A second drain pipe (703) for discharging condensed accumulated water is arranged at the bottom of the second return air pipe (7).

2. The circulating air control and temperature control greenhouse system according to claim 1, wherein: The second return air pipe (7) is specifically made of stainless steel pipe or galvanized steel pipe. Heat dissipation fins (702) are arranged on the outer wall of the second return air pipe (7).

3. The circulating air control and temperature control greenhouse system according to claim 1, characterized in that: The outer side wall of the return air chamber (8) is made of a heat-insulating wall (801). The heat-insulating wall (801) also serves as the side wall of the temperature-adjusting greenhouse (2).

4. The circulating air control and temperature control greenhouse system according to claim 3, characterized in that: An inspection door (102) is arranged on the long-side wall (101) between the temperature-adjusting greenhouse (2) and the main greenhouse (1).

5. The circulating air control and temperature control greenhouse system according to claim 1, wherein: A heat pump room (3) is further included. The air outlet of the discharge air pipe (11) is arranged inside the heat pump room (3). An air source heat pump is arranged inside the heat pump room (3). The hot end of the air source heat pump is connected to the air-conditioning coil (10).

6. The circulating air control and temperature control greenhouse system according to any one of claims 1 to 5, characterized in that: An indoor light-shielding curtain (12) is arranged above the interior of the main greenhouse (1). An outdoor light-shielding curtain (13) is arranged above the exterior of the main greenhouse (1).

7. A temperature control method for a circulating risk control and temperature control greenhouse system, characterized in that, The temperature control is carried out by using the circulating air control and temperature control greenhouse system according to any one of the above claims 1 to 6. By setting up a temperature adjustment greenhouse on one side of the main greenhouse, the return air is introduced into the temperature adjustment greenhouse through the circulating pipeline for temperature adjustment, and then circulated and evenly distributed into the main greenhouse.

8. The temperature control method of the circulating risk control and temperature control greenhouse system according to claim 7, characterized in that, Part of the exhaust air flowing in a cycle is introduced into the cold end of the air source heat pump to make full use of the waste heat of the exhaust gas.

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