Crop greenhouse ventilation device

Abstract

The utility model relates to the technical field of greenhouse ventilation devices, in particular to a crop greenhouse ventilation device which comprises an outer pipe, a heat preservation layer is fixedly installed on the inner side wall of the outer pipe, a metal air inlet pipe is fixedly installed on the inner side wall of the heat preservation layer, and a metal exhaust pipe is fixedly installed in the metal air inlet pipe. Heat conduction fins are fixedly installed inside and outside the metal exhaust pipe, a bearing is fixedly installed at the top end of the metal exhaust pipe, and a three-way pipe is fixedly installed on the outer side wall of the bearing; in the process of exchanging air in the greenhouse, according to the second law of thermodynamics, heat of exhausted hot air can be transmitted to entering cold air along the heat conduction fins and the metal exhaust pipe, so that the exhausted air is cooled, the entering air is heated, heat energy in the greenhouse can be prevented from being lost during ventilation, and the ventilation efficiency of the greenhouse is improved. And the effect of avoiding rapid loss of the internal temperature during ventilation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of greenhouse ventilation devices, in particular to a ventilation device for a crop greenhouse. Background Art

[0002] In modern agriculture, the cultivation of greenhouse crops such as edible fungi is becoming increasingly important. This allows them to break through seasonal and climatic limitations, achieve off-season production, and maintain a stable yield supply. To create an ideal growing environment, the following technologies are typically required to build greenhouses for crops:

[0003] 1. Frame structure, generally using metal (such as steel) or strong plastic materials to build the support frame of the greenhouse to ensure its stability and durability;

[0004] 2. Covering materials, commonly glass, plastic film (such as polyethylene film) or polycarbonate board, etc., must have good light transmittance and thermal insulation properties;

[0005] 3. Ventilation equipment, including fans, ventilation ducts, etc., used to regulate air circulation in the greenhouse;

[0006] 4. Insulation materials, such as thermal blankets and straw mats, are used at night or in cold weather to maintain indoor temperature.

[0007] Existing Chinese patent: A ventilation device for a greenhouse, patent number: CN207040374U, comprising a box body, a shell body connected to the left side of the box body, an air collecting hopper connected to the left side of the shell body, a fan disposed inside the box body, support rods fixedly mounted on the top and bottom of the fan, and the end of the support rod away from the fan is fixedly connected to the inner wall of the box body. The ventilation device for the greenhouse achieves the effect of facilitating the opening and closing of the ventilation device for the greenhouse by arranging a slide rail, a slide rod, a fixed rod, a motor, a screw rod, a nut, a limit block, an air hopper, a piston, a push rod and a through hole, thereby ensuring the sealing of the ventilation device for the greenhouse, thereby ensuring that the temperature inside the greenhouse is not affected, which is beneficial to the growth of crops and thus improving the working efficiency of the ventilation device for the greenhouse.

[0008] However, during the implementation of the above technical solution, it was found that there were at least the following technical problems: the above ventilation device maintains the internal temperature of the greenhouse by closing the through holes to seal the greenhouse, but when ventilating the interior of the greenhouse, the external low-temperature air enters and the internal high-temperature air is discharged, which will still cause the internal temperature of the greenhouse to drop rapidly, resulting in a rapid loss of heat energy inside the greenhouse. Therefore, the above ventilation device cannot maintain the temperature during the ventilation process. Utility Model Content

[0009] (1) Technical problems solved

[0010] In response to the deficiencies of the prior art, the utility model provides a ventilation device for a crop greenhouse, which solves the technical problem that the above-mentioned ventilation device seals the greenhouse by closing the through holes to maintain the internal temperature of the greenhouse. However, when ventilating the interior of the greenhouse, the external low-temperature air enters and the internal high-temperature air is discharged, which still causes the internal temperature of the greenhouse to drop rapidly, resulting in rapid loss of heat energy inside the greenhouse. Therefore, the above-mentioned ventilation device cannot maintain the temperature during ventilation.

[0011] (2) Technical solution

[0012] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0013] A greenhouse ventilation device for crops comprises an outer tube, an inner side wall of the outer tube having a thermal insulation layer fixedly mounted thereon, an inner side wall of the thermal insulation layer having a metal air inlet pipe fixedly mounted thereon, a metal exhaust pipe fixedly mounted thereon, heat-conducting fins fixedly mounted thereon and on the inside and outside of the metal exhaust pipe, a bearing fixedly mounted thereon at the top end of the metal exhaust pipe, a tee pipe fixedly mounted thereon at the outer side wall of the bearing, a control box fixedly mounted thereon at the side end of the tee pipe, and a photovoltaic panel fixedly mounted thereon at the top end of the tee pipe; an STM32 single-chip microcomputer and a battery mounted thereon, the photovoltaic panel connected to the STM32 via a wire, a motor fixedly mounted thereon; the motor connected to the STM32 single-chip microcomputer inside the control box via a wire, a first fan blade fixedly mounted on a rotating shaft of the motor, and a rotary encoder fixedly mounted on the control box; the rotary encoder connected to the STM32 single-chip microcomputer inside the control box via a wire, and a second fan blade fixedly mounted on the rotating shaft of the rotary encoder.

[0014] Preferably, a rudder plate is fixedly mounted on the tee pipe.

[0015] Preferably: a base is fixedly mounted on the outer tube.

[0016] (3) Beneficial effects

[0017] 1. When wind blows through the three-way pipe, the air inside the greenhouse will be drawn out under the action of pressure. When the air inside the greenhouse decreases, the internal pressure will decrease, and the outside air will enter the greenhouse through the metal air inlet pipe under the action of pressure to complete the ventilation. When there is wind, the second fan blade will be blown by the wind to drive the shaft of the rotary encoder to rotate. The rotary encoder sends the rotation data to the STM32 inside the control box through the wire. When the wind speed is fast, the motor will not start. At the same time, the photovoltaic panel will The battery is charged. When the wind speed is too fast, the motor will be started to drive the first fan blade to rotate counterclockwise and blow air in the opposite direction to reduce the air flow rate inside the three-way pipe. When there is no wind or the wind speed is too slow, the motor will be started to drive the first fan blade to rotate clockwise to speed up the air flow rate inside the three-way pipe so that it can be ventilated smoothly. When ventilation is not required, the bottom of the heat-conducting fin can be blocked with a rubber plug or other object. Natural energy can be used for ventilation without an external power supply, achieving the effect of natural environmental protection and easy installation.

[0018] 2. During the air exchange inside the greenhouse, the internal hot air passes through the thermal fins and the external air passes through the metal air inlet pipe. The thermal fins will increase the contact area with the air. According to the second law of thermodynamics, the heat of the exhausted hot air will be transferred along the thermal fins and the metal exhaust pipe to the incoming cold air, thereby cooling the exhausted air and heating the incoming air. This can prevent the heat energy inside the greenhouse from being lost during ventilation, and achieve the effect of preventing the internal temperature from being lost quickly during ventilation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0020] Figure 1 This is a structural diagram of the base of the utility model;

[0021] Figure 2 It is a cross-sectional structural diagram of the utility model;

[0022] Figure 3 This is a structural diagram of a three-way pipe of the present utility model;

[0023] Figure 4 For this utility model Figure 3 A magnified structural diagram;

[0024] Figure 5 This is a structural diagram of the metal exhaust pipe of the present utility model;

[0025] Figure 6 This is a structural diagram of the heat-conducting fins of the present utility model.

[0026] Legend: 1. Outer tube; 2. Insulation layer; 3. Metal air inlet pipe; 4. Thermal fins; 5. Metal exhaust pipe; 6. Bearing; 7. Tee pipe; 8. Rudder plate; 9. Photovoltaic panel; 11. First fan blade; 12. Motor; 13. Control box; 14. Rotary encoder; 15. Second fan blade; 16. Base. DETAILED DESCRIPTION

[0027] The embodiment of the present application effectively solves the above-mentioned ventilation device by providing a crop greenhouse ventilation device. The greenhouse is sealed by closing the through holes to maintain the internal temperature of the greenhouse. However, when ventilating the interior of the greenhouse, the external low-temperature air enters and the internal high-temperature air is discharged, which will still cause the internal temperature of the greenhouse to drop rapidly, resulting in rapid loss of heat energy inside the greenhouse. Therefore, the above-mentioned ventilation device cannot maintain the temperature during ventilation. Technical problem, when wind passes through the three-way pipe, the air inside the greenhouse will be drawn out under the action of pressure. When the air inside the greenhouse decreases, its internal pressure will decrease, and the external air will enter the interior of the greenhouse through the metal air inlet pipe under the action of pressure to complete ventilation. When there is wind, the second fan blade will be blown by the wind to drive the rotating shaft of the rotary encoder to rotate. The rotary encoder sends the rotation data to the STM32 inside the control box through a wire. When the wind speed is fast, the motor will not start. At the same time, the photovoltaic panel charges the battery inside the control box. When the wind When the speed is too fast, the motor will be started to drive the first fan blade to rotate counterclockwise and blow air in the opposite direction to reduce the air flow rate inside the three-way pipe. When there is no wind or the wind speed is too slow, the motor will be started to drive the first fan blade to rotate clockwise to speed up the air flow rate inside the three-way pipe so that it can be ventilated smoothly. When ventilation is not required, the bottom of the heat-conducting fin can be blocked with a rubber plug or other object. No external power supply is required to use natural energy for ventilation, achieving the effect of natural environmental protection and easy installation. In the process of air exchange inside the greenhouse, the internal hot air passes through the heat-conducting fins and the external air passes through the metal air inlet pipe. The heat-conducting fins will increase the contact area with the air. According to the second law of thermodynamics, the heat of the exhausted hot air will be transferred along the heat-conducting fins and the metal exhaust pipe to the incoming cold air, thereby cooling the exhaust air and heating the incoming air, which can prevent the heat energy inside the greenhouse from being lost during ventilation, thereby achieving the effect of preventing the internal temperature from being lost quickly during ventilation.

[0028] Example

[0029] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown, the technical solution in the embodiment of the present application effectively solves the above-mentioned ventilation device, which maintains the internal temperature of the greenhouse by closing the through hole to seal the greenhouse. However, when the interior of the greenhouse is ventilated, the external low-temperature air enters and the internal high-temperature air is discharged, which still causes the internal temperature of the greenhouse to drop rapidly, resulting in rapid loss of heat energy inside the greenhouse. Therefore, the above-mentioned ventilation device cannot maintain the temperature during ventilation. The overall idea is as follows:

[0030] In response to the problems existing in the prior art, the utility model provides a greenhouse ventilation device for crops, comprising an outer tube 1, an inner wall of the outer tube 1 is fixedly mounted with an insulation layer 2, an inner wall of the insulation layer 2 is fixedly mounted with a metal air inlet pipe 3, a metal exhaust pipe 5 is fixedly mounted inside the metal air inlet pipe 3, heat-conducting fins 4 are fixedly mounted inside and outside the metal exhaust pipe 5, and a bearing 6 is fixedly mounted on the top end of the metal exhaust pipe 5.

[0031] A tee pipe 7 is fixedly installed on the outer wall of the bearing 6, a control box 13 is fixedly installed on the side end of the tee pipe 7, and a photovoltaic panel 9 is fixedly installed on the top of the tee pipe 7; an STM32 microcontroller and a battery are installed inside the control box 13, and the photovoltaic panel 9 is connected to the STM32 through a wire; a motor 12 is fixedly installed inside the tee pipe 7; the motor 12 is connected to the STM32 microcontroller inside the control box 13 through a wire.

[0032] The first fan blade 11 is fixedly mounted on the rotating shaft of the motor 12, and a rotary encoder 14 is fixedly mounted on the control box 13; the rotary encoder 14 is connected to the STM32 microcontroller inside the control box 13 through a wire, and the second fan blade 15 is fixedly mounted on the rotating shaft of the rotary encoder 14, the rudder plate 8 is fixedly mounted on the three-way pipe 7, and the base 16 is fixedly mounted on the outer tube 1.

[0033] Working principle:

[0034] The first step is to insert the base 16 into the soil inside the greenhouse during installation, and then make the top of the outer tube 1 exposed to the roof. During use, when there is wind outside, the air flow will push the rudder plate 8 to rotate the tee pipe 7, so that the opening of the tee pipe 7 is consistent with the wind direction, and the wind will pass through the inside of the tee pipe 7, that is, the air flow rate inside the tee pipe 7 becomes faster. According to Bernoulli's principle, in the pipeline fluid, the greater the flow rate, the lower the pressure, so the pressure inside the tee pipe 7 will become smaller. When the pressure inside the tee pipe 7 is lower than the pressure inside the heat-conducting fins 4, the air inside the heat-conducting fins 4 will enter the tee pipe 7 under the action of pressure and then be carried away by the wind. When the pressure inside the heat-conducting fins 4 becomes smaller, the air inside the greenhouse will enter the heat-conducting fins 4 under the action of pressure. In summary, when there is wind passing through the tee pipe 7, the air inside the greenhouse will be drawn out under the action of pressure. When the air inside the shed is reduced, the internal pressure will decrease, and the external air will enter the shed through the metal air inlet pipe 3 under the action of pressure to complete ventilation. When there is wind, the second fan blade 15 will be blown by the wind to drive the rotating shaft of the rotary encoder 14 to rotate. The rotary encoder 14 sends the rotation data to the STM32 inside the control box 13 through a wire. When the wind speed is fast, the motor 12 will not start. At the same time, the photovoltaic panel 9 charges the battery inside the control box 13. When the wind speed is too fast, the motor 12 will be started to drive the first fan blade 11 to rotate counterclockwise and blow in the opposite direction to reduce the air flow rate inside the tee pipe 7. When there is no wind or the wind speed is too slow, the motor 12 will be started to drive the first fan blade 11 to rotate clockwise to speed up the air flow rate inside the tee pipe 7 so that it can be ventilated smoothly. When ventilation is not needed, the bottom end of the heat conducting fin 4 can be blocked with a rubber stopper or other object.

[0035] In the second step, during the air exchange inside the greenhouse, the internal hot air passes through the heat-conducting fins 4 and the external air passes through the metal air inlet pipe 3. The heat-conducting fins 4 will increase the contact area with the air. According to the second law of thermodynamics, the heat of the exhausted hot air will be transferred along the heat-conducting fins 4 and the metal exhaust pipe 5 to the incoming cold air, cooling the exhausted air and heating the incoming air. This can prevent the heat energy inside the greenhouse from being lost during ventilation, achieving the effect of heat energy recovery. The thermal insulation layer 2 outside the metal air inlet pipe 3 can play a thermal insulation effect, which can prevent the air inside the greenhouse from heating the incoming air, so that the heat for the incoming air to heat up comes entirely from the exhausted air. The position of the incoming and outgoing air can also be changed by connecting pipes at the ends of the thermal insulation layer 2 and the heat-conducting fins 4.

[0036] Finally, it should be noted that the above embodiments are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments. Those skilled in the art will readily appreciate that other variations or modifications based on the above description are possible. It is not necessary and impossible to enumerate all embodiments here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A ventilation device for a crop greenhouse, comprising an outer tube (1), characterized in that: The inner wall of the outer tube (1) is fixedly mounted with a heat-insulating layer (2), the inner wall of the heat-insulating layer (2) is fixedly mounted with a metal air inlet pipe (3), the interior of the metal air inlet pipe (3) is fixedly mounted with a metal exhaust pipe (5), the interior and exterior of the metal exhaust pipe (5) are fixedly mounted with heat-conducting fins (4), the top end of the metal exhaust pipe (5) is fixedly mounted with a bearing (6), and the outer wall of the bearing (6) is fixedly mounted with a three-way pipe (7).

2. A crop greenhouse ventilation device according to claim 1, characterized in that: A control box (13) is fixedly mounted on the side end of the three-way pipe (7), and a photovoltaic panel (9) is fixedly mounted on the top end of the three-way pipe (7); The control box (13) is internally installed with an STM32 single-chip microcomputer and a battery, and the photovoltaic panel (9) is connected to the STM32 via a wire.

3. The crop greenhouse ventilation device according to claim 1, characterized in that: A motor (12) is fixedly installed inside the three-way pipe (7); The motor (12) is connected to the STM32 single chip microcomputer inside the control box (13) via a wire.

4. A crop greenhouse ventilation device according to claim 3, characterized in that: The first fan blade (11) is fixedly mounted on the rotating shaft of the motor (12).

5. The crop greenhouse ventilation device according to claim 2, characterized in that: A rotary encoder (14) is fixedly mounted on the control box (13); The rotary encoder (14) is connected to the STM32 single chip microcomputer inside the control box (13) via a wire.

6. A crop greenhouse ventilation device according to claim 5, characterized in that: A second fan blade (15) is fixedly mounted on the rotating shaft of the rotary encoder (14).

7. The crop greenhouse ventilation device according to claim 1, characterized in that: A steering plate (8) is fixedly mounted on the three-way pipe (7).

8. The crop greenhouse ventilation device according to claim 1, characterized in that: A base (16) is fixedly mounted on the outer tube (1).

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