The core configuration for cooling in the smart greenhouse during summer
In the operation system of modern intelligent greenhouse facilities, whether it is the widely used plastic-covered multi-span greenhouse, or the solar panel greenhouse or glass greenhouse with better insulation and light transmission properties, high temperatures in agricultural greenhouses summer remain the key challenge affecting the normal growth of crops. To break through this limitation agricultural greenhouses and achieve precise control of the internal temperature of the greenhouse, the forced ventilation cooling system has become the core supporting facility of the intelligent greenhouse. And agricultural greenhouses the greenhouse side-opening agricultural greenhouses window (also known as the water curtain external-opening window) and the wall-mounted electric opening window system are indispensable important components of this cooling system. The material agricultural greenhousesselection, working principle and connection technology directly determine the cooling efficiency and the stability of greenhouse operation.
I. Materials composition of the water curtain external-opening window: Balancing structural stability and sealing performance
The water curtain external-opening window is usually placed on the outside of the greenhouse wet curtain and is a key passage for connecting the external air with the internal air circulation of the greenhouse. Its material composition needs to meet the three requirements of structural support, flexible opening and closing, and sealing and insulation at the same time. It can be divided into three categories: core structural components, aluminum profile components and auxiliary accessories:
1. Core structural components
To ensure the overall stability and opening and closing power of the side-opening window, the core structural components mainly include column supports, drive motors, drive sprockets and drive pipe accessories. Among them, the column supports bear the overall load of the side-opening window and need to have sufficient anti-pressure and anti-wind performance; the drive motor serves as the power source and directly determines the opening speed and smooth operation; the drive sprocket and drive pipe accessories are responsible for converting the rotational power of the motor into the flipping action of the side-opening window, and need to ensure the accuracy and wear resistance of the transmission process.
2. Aluminum profile components
Aluminum profiles, due to their light weight, corrosion resistance and high processing accuracy, have become the main frame material of the side-opening window. Specifically, they include:
Side window fixed hinges and movable hinges: The two are used in combination to achieve the core connection component for the flipping and opening of the side-opening window, and need to ensure the flexibility of the hinge rotation and the service life;
H clips (upper and lower parts): Used to fix the covering material (such as solar panels) in the middle of the side window, the structural design needs to fit the thickness of the covering material to ensure a firm fixation and avoid gaps;
Side window cover plates and the lower edge of the side window: The side agricultural greenhouseswindow cover plates are used to seal the connection between the side window top and the agricultural greenhouses frame, and the lower edge of the side window is responsible for fixing the bottom edge of the covering material, both of which jointly enhance the overall sealing performance of the side-opening window;
3. Auxiliary accessories
Although the auxiliary accessories are small in size, they are crucial to the functional integrity of the side-opening window, including:
Sprocket seats: Used to fix the drive sprocket, ensuring the stability of the position of the sprocket during the transmission process and avoiding offset;
Side window connection plates: For side windows longer than 6 meters, they need to be connected through connection plates to ensure the integrity of the frame;
Side window rubber strips: Adhered to the connection areas between the side window and the greenhouse frame and the covering material, it is the key to improving the sealing performance of the side-opening window, effectively reducing the leakage of cold air and the infiltration of hot air;
Fasteners such as bolts and other fasteners: Used to connect various structural components and aluminum profiles, they need to be made of corrosion-resistant stainless steel to avoid rust and damage in the long-term exposure to high humidity in the greenhouse.
II. Working principle and control logic agricultural greenhouses of the water curtain external-opening window: Precise linkage, ensuring cooling efficiency
The core function of the water curtain external-opening window is to cooperate with the forced ventilation cooling system to achieve the efficient introduction of external cold air. The rationality of the working principle and control logic of the system directly affects the overall efficiency of the cooling system.
1. Working principle: Precise flipping driven by the motor The opening and closing action of the external curtain window is achieved through the power transmission path agricultural greenhousesof "motor - transmission component - window sash": After the drive motor is activated, it drives the drive pipe accessories and the drive rack to rotate. The agricultural greenhouses rack then pushes the side window movable hinge during the transmission process, thereby driving the entire side-reversing window to rotate around the fixed hinge, ultimately achieving the opening or closing of the window sash. The entire process does not require manual intervention and can be automated through the control system, and the flipping angle can be adjusted according to the internal temperature requirements of the greenhouse to flexibly control the air intake volume.
2. Control System Logic: Open the window first, then exhaust air, avoiding negative pressure imbalance
To ensure the stable operation of the forced exhaust cooling system, the control system must follow strict logical settings: Before starting the exhaust fan, the opening procedure of the external curtain window must be initiated first. Once the side-reversing window is fully opened (or reaches the preset opening angle), the exhaust fan can be activated. The core purpose of this agricultural greenhouses logical design is to avoid excessive negative pressure in the greenhouse interior when the exhaust fan agricultural greenhouses is activated - if the exhaust fan is started first and the side-reversing window does not open in time, the internal air pressure will drop sharply, which may cause the wet curtain to deform, the covering material to be damaged, and even affect the growth environment of the crops.
3. Dimensions and Processing: Customized as needed, reducing material waste
In practical applications, the height of the external curtain window needs to be flexibly adjusted according to the overall design of the greenhouse, the size of the wet curtain, and the cooling requirements. Currently, the common height is 1.5 meters, and for some large greenhouses or scenarios with higher air intake requirements, a 1.8-meter-high side-reversing window is also used. To improve material utilization and reduce costs, the aluminum profiles of the agricultural greenhouses side-reversing window mostly adopt the "fixed-length production" mode:
For the H clamp that fixes the sunlight panel in the middle of the side window, precise calculation and fixed-length processing are required based on the actual height of the side-reversing window to minimize waste;
For the fixed hinges and movable hinges of the side window, which have no special size requirements, the aluminum profiles are usually produced and processed in 6-meter standard lengths, and can be cut and spliced according to on-site needs, balancing versatility and flexibility.
III. Connection Method of the External Curtain Window: Detail control, ensuring sealing and stability
The connection method of the external curtain window directly affects its structural stability and sealing performance, and different components' functional characteristics require agricultural greenhouses targeted connection techniques. It can be divided into three links:
1. Frame connection: Ensure overall structural stability
Connection of the side window fixed hinge: The fixed hinge needs to be firmly fixed to the surrounding beams of the greenhouse with bolts, ensuring the precise position and not being loose, providing stable support for the side-reversing window to flip;
Splicing of long-length side windows: When the side window length exceeds 6 meters, side window connection pieces need to be used for splicing at the middle connection point between the two sections of aluminum profiles. The connection pieces need to cover both sections of the connection surface and be fixed with multiple bolts to avoid gaps or loosening at the connection point, ensuring the integrity of the frame.
2. Fixation of the covering material: Firmly attached, avoiding detachment
The covering material of the external curtain window mostly uses 8mm thick sunlight panels, and its fixation method needs to balance firmness and sealing:
Middle fixation: The sunlight panel is fixed to the side window frame through the H clamp to ensure the fixation effect. The H clamp needs to be evenly arranged at intervals of "one meter per one" and the groove of the H clamp needs to match the thickness of agricultural greenhousesthe sunlight panel to avoid the sunlight panel from shaking or detaching;
Bottom fixation: The bottom edge of the sunlight panel is fixed together with the side window cover plate, the side window lower edge adheres to the bottom surface of the sunlight panel, and the side window cover plate presses from above, forming a double fixation and sealing the bottom gap between the sunlight panel and the frame.
3. Sealing treatment: Reduce air leakage, improve cooling efficiency The sealing performance is the key factor determining whether the side-opening window can cooperate with the forced ventilation system to achieve efficient cooling. It is mainly achieved through the sealing rubber strips of the side window:
The rubber strips need to be attached to the connection area between the movable hinge and the fixed frame of the side window, the contact area between the lower edge of the side window and the sunshade panel, and the gap between the side window cover plate and the greenhouse frame;
The material of the rubber strips should be selected as rubber or silicone materials with good aging resistance and elasticity, to ensure that they do not deform or crack during long-term use, and always maintain a close fit with the contact surface, minimizing the leakage of cold air during the transfer process, and improving the energy efficiency of the forced ventilation cooling system.
In conclusion, although the side-opening agricultural greenhouseswindow of the greenhouse and the wall-mounted electric opening window system may seem like "small components" of the greenhouse, the rationality of material selection, the scientificity of working principle, agricultural greenhousesand the rigor of connection technology directly affect the efficiency and stability of the agricultural greenhouses intelligent greenhouse summer cooling system, and are also an important foundation for ensuring the healthy growth of crops and the efficient operation of the greenhouse. With the continuous development of intelligent greenhouse technology, the side-opening window system will also be upgraded agricultural greenhouses towards a more lightweight, more intelligent, and more energy-efficient direction, providing more powerful support for the sustainable development of modern agriculture.
