Air supply and return airflow circulation structure of phytotron

Abstract

The invention belongs to the technical field of agricultural breeding, and particularly relates to an air supply and return airflow circulation structure of an artificial climate chamber, which comprises an enclosure structure, a side air supply wall body, a sandwich plate, a raised floor, an air conditioner indoor unit and an air supply fan, the side air supply wall bodies, the sandwich plate and the raised floor are all arranged in the enclosure structure, the number of the side air supply wall bodies is two, the top ends of the two side air supply wall bodies are both fixed to the bottom face of the ceiling, and the sandwich plate is fixedly arranged in a space defined by the ceiling and the two side air supply wall bodies and located at the tops of the side air supply wall bodies. The raised floor is fixedly arranged at the bottom ends of the two side air supply walls; the air conditioner indoor unit is arranged in the top interlayer cavity, and the air supply fan is arranged at the ventilation opening. According to the invention, the uniformity of the temperature in the phytotron can be improved, and the utilization rate of the laboratory area can also be improved.

Description

Technical Field

[0001] This invention belongs to the field of agricultural breeding technology, and specifically relates to a supply and return airflow circulation structure for an artificial climate chamber. Background Technology

[0002] Artificial climate chambers can precisely simulate various climatic conditions such as temperature, humidity, light, and CO2 concentration, providing a controllable environment for tree breeding, seedling cultivation, and seed and seedling development in the biopharmaceutical industry. They play an irreplaceable role in plant physiological and ecological research, pest and disease control, and plant breeding and genetics research. Their controllable environmental characteristics ensure the reliability and reproducibility of experimental results, while accelerating biological generation and shortening experimental cycles. Furthermore, they can be customized in design and configuration according to experimental needs.

[0003] Currently, the air supply and return circulation structure is one of the core components affecting the environmental control accuracy of artificial climate chambers. The common air supply methods in existing technologies mainly include four types: top supply and top return, side supply and top return, side supply and side return, and bottom supply and side return. (1) Top-feeding and top-returning method: It is suitable for scenarios with low power growth lamps and low temperature accuracy requirements. However, it is difficult to ensure temperature uniformity in scenarios with high power top-mounted growth lamps. (2) Side-feeding top-return and side-feeding side-return: can be adapted to both culture rack and top-mounted growth lamp scenarios. With reasonable airflow design, good temperature uniformity can be achieved, but the non-vertical circulation characteristics of airflow still pose a risk of local temperature fluctuation. (3) Bottom supply and side return method: This method is suitable for ceiling-mounted growth light scenarios. It can achieve preliminary air supply uniformity through floor air supply. However, due to the use of side return air, there is a significant temperature superposition effect, resulting in higher temperatures closer to the return air vent, which seriously affects temperature uniformity. For example, the patent solution disclosed in application number CN202153904U adopts a bottom supply and side return structure. At the same time, this solution places the air conditioning unit on the side, which requires additional installation space and significantly reduces the effective usable area of ​​the laboratory. For the mainstream application scenarios of top-mounted grow lights, the existing supply and return air structures generally have technical defects such as poor temperature uniformity due to unreasonable airflow circulation and insufficient effective usable area due to the space occupied by equipment installation. How to achieve vertical airflow circulation to improve temperature uniformity while ensuring the normal operation of top-mounted grow lights, and at the same time optimize equipment layout to improve space utilization, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] To address the aforementioned deficiencies in existing technologies, this invention provides a supply and return airflow circulation structure for an artificial climate chamber, comprising an enclosure structure, side-supply walls, a sandwich panel, a raised floor, an indoor air conditioning unit, and a supply fan. The enclosure structure includes a ceiling, a floor, and four supporting walls fixedly connected between the ceiling and the floor. The side-supply walls, the sandwich panel, and the raised floor are all housed within the enclosure structure. There are two side-supply walls, with their tops fixed to the bottom surface of the ceiling. A side sandwich cavity is provided between the side-supply walls and the supporting walls, and the sandwich panel is fixedly installed. Within the space enclosed by the ceiling and two side air supply walls, and located at the top of the side air supply walls, a top interlayer cavity is provided between the interlayer board and the ceiling. The top of the side air supply walls is provided with a ventilation opening for connecting the top interlayer cavity and the side interlayer cavity. The raised floor is fixedly installed at the bottom of the two side air supply walls. A bottom interlayer cavity is provided between the raised floor and the bottom plate, and the bottom interlayer cavity is connected to the side interlayer cavity. The space enclosed by the raised floor, the interlayer board, and the two side air supply walls is the experimental area. The indoor unit of the air conditioner is installed in the top interlayer cavity, and the air supply fan is installed at the ventilation opening.

[0005] Preferably, the bottom of the indoor unit of the air conditioner is the return air vent, which extends downward through the interlayer plate and connects to the experimental area; the left and right sides of the indoor unit of the air conditioner are the air outlets.

[0006] Preferably, a fresh air supply duct is installed through the top interlayer cavity, the fresh air supply duct is located close to the indoor unit of the air conditioner, the bottom of the fresh air supply duct is the fresh air outlet, it passes through the interlayer plate downwards and is connected to the experimental area.

[0007] Preferably, an exhaust duct is also installed through the top interlayer cavity. The exhaust duct is located away from the indoor unit of the air conditioner. The bottom of the exhaust duct is an exhaust port, which extends downward through the interlayer plate and connects to the experimental area.

[0008] Preferably, the return air vent of the indoor unit of the air conditioner is equipped with a return air louver and an air filter, the fresh air supply vent of the fresh air supply duct is equipped with a diffuser, and the exhaust vent of the exhaust duct is equipped with an exhaust louver.

[0009] Preferably, multiple top-mounted growth lights are provided at the top of the experimental area.

[0010] Preferably, multiple air supply holes are provided on the raised floor.

[0011] Specifically, positive pressure is maintained inside the raised floor, controlled by a blower; the number and distribution of air supply holes are adjusted according to the static pressure, with fewer holes in areas of high static pressure and more holes in areas of low static pressure, in order to achieve uniform air supply.

[0012] Preferably, the supporting walls and roof of the enclosure structure are made of insulation boards, and the outside of the base plate is provided with an insulation layer. It should be noted that the enclosure structure must be tightly sealed to prevent air leakage and reduce heat loss.

[0013] Preferably, the side air supply wall and the mezzanine board are made of heat-insulating cleanroom panels, and the raised floor is made of anti-static flooring. It should be noted that the side air supply wall, mezzanine board and raised floor must be tightly sealed to prevent air leakage and reduce heat loss.

[0014] This invention also includes other components that enable the supply and return airflow circulation structure of an artificial climate chamber to function properly, all of which are conventional techniques in the art. Furthermore, any devices or components not specified in this invention employ conventional techniques in the art.

[0015] The working principle of this invention is as follows: the entire airflow circulation process includes a main airflow circulation and a fresh air circulation. The main airflow circulation process is as follows: when the top-mounted growth lamp is working, it generates heat, creating a high-temperature environment in the climate chamber; the indoor air conditioning unit and the supply fan are activated, and the indoor air conditioning unit draws in the high-temperature air from the room through the return air vent, cools it, and then sends it into the top interlayer cavity; the supply fan sends the cooled air from the top interlayer cavity into the side interlayer cavity of the side supply air wall, and then into the bottom interlayer cavity formed by the raised floor; the air in the bottom interlayer cavity is maintained at a stable positive pressure under the action of the supply fan, and is sent upward at a uniform speed through the air outlets on the raised floor, forming a vertically rising airflow; after the rising airflow flows through the top-mounted growth lamp and the experimental area, it is drawn back into the return air vent of the indoor air conditioning unit, completing the main airflow circulation. The fresh air circulation process is as follows: Fresh air from outside is sent into the climate chamber through the fresh air supply vent (diffuser). Because the fresh air supply vent is close to the return air vent of the indoor air conditioning unit, the fresh air can be directly drawn into the indoor air conditioning unit and mixed with the indoor circulating air for cooling before participating in the main airflow circulation. At the same time, some indoor air is discharged through the exhaust vent to maintain the normal indoor air pressure balance.

[0016] The beneficial effects of this invention are: (1) Significantly improved temperature uniformity: The present invention adopts a vertical airflow circulation design of "top return air - bottom supply air", which avoids the temperature superposition effect of the existing side supply and side return methods; combined with the air supply hole distribution design of the raised floor according to static pressure, the airflow rises at a uniform speed, so that the temperature distribution in each area of ​​the climate room is uniform, effectively solving the technical defect of high temperature near the return air in the scenario of top-mounted growth lamp. (2) Space utilization is greatly improved: The core equipment such as the air conditioning indoor unit and the air supply fan are integrated and installed in the technical mezzanine. The air is guided by the side air supply wall, eliminating the need to set up equipment installation space on the side wall, maximizing the release of the effective experimental area inside the climate room and improving the utilization rate of the laboratory area. (3) Strong environmental stability: The building envelope, sandwich panel and side air supply wall are all designed with thermal insulation and sealing. Combined with the air filter of the return air vent, it can effectively prevent heat leakage, air leakage and dust from entering, and ensure the stability of indoor climate parameters. The reasonable layout of the fresh air supply and return air vents ensures that the fresh air is fully treated and participates in circulation, while maintaining air pressure balance and improving indoor air quality.

[0017] (4) Wide adaptability: It is specially designed for the scenario of top-mounted growth lights and can meet the heat dissipation adaptation requirements of top-mounted growth lights with different power. At the same time, by adjusting the distribution of air supply holes in the raised floor and the power of the air supply fan, it can be adapted to artificial climate chambers of different sizes and specifications, and has a wide range of applications. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] In the diagram: 1. Supporting wall, 2. Ceiling, 3. Floor slab, 4. Mezzanine board, 5. Side air supply wall, 6. Raised floor, 7. Indoor air conditioning unit, 8. Air supply fan, 9. Return air vent, 10. Fresh air supply duct, 11. Exhaust duct, 12. Fresh air supply vent, 13. Exhaust vent, 14. Top-mounted growth light, 15. Top mezzanine cavity, 16. Side mezzanine cavity, 17. Bottom mezzanine cavity. Detailed Implementation

[0021] The present invention will now be clearly described with reference to the accompanying drawings and specific embodiments. This description is merely illustrative and is not intended to limit the scope of the invention. Any modifications, equivalent substitutions, or improvements made by those skilled in the art based on the embodiments of the present invention without inventive effort to obtain all other embodiments should be included within the scope of protection of the present invention.

[0022] Example 1 like Figure 1 As shown, the embodiment of the present invention is for 100m 2 The design of an artificial climate chamber for agricultural breeding (length × width × height 10m) with a supply and return air circulation structure is as follows: (1) Enclosure structure: The supporting wall 1 is made of 50mm thick polyurethane insulated sandwich panel, the ceiling 2 is made of 60mm thick rock wool insulated purification board, and the floor 3 is made of 100mm thick extruded polystyrene board insulation layer. All joints are sealed with sealant, and the air leakage rate is ≤0.02m. 3 / (h·m 2 ); (2) Sandwich panel 4: 50mm thick rock wool purification board is used, and the installation height is 50cm from the ceiling to form a 50cm high top sandwich cavity 15; (3) Side air supply wall 5: 50mm thick rock wool purification board is used and installed along the wall of the climate chamber. The width of the side interlayer cavity 16 is 30cm. It is fixedly connected to the interlayer board and the raised floor 6 with sealing parts. (4) Raised floor: 600mm×600mm antistatic ventilated floor is used, with a raised height of 30cm; through fluid simulation calculation, the static pressure in the central area of ​​the raised floor is about 25Pa, and the static pressure in the edge area is about 15Pa. Therefore, 8 air supply holes with a diameter of 5mm are opened in each floor in the central area, and 12 air supply holes with a diameter of 5mm are opened in each floor in the edge area to ensure that the uniformity deviation of the air supply speed in the whole area is ≤±5%; (5) Indoor air conditioning unit 7: Select a precision air conditioner with a cooling capacity of 50kW, and return air outlet 9 with a size of 800mm×600mm, equipped with aluminum alloy return air louvers and G4 grade air filter; (6) Air supply fan 8: Selected air volume 10000m³ 3 A centrifugal fan with a wind pressure of 500Pa and a wind speed of / h is used. The air outlet of the fan is connected to the ventilation opening of the side air supply wall with a flexible short pipe to reduce the impact of vibration. (7) Fresh air supply duct 10 and exhaust duct 11: Fresh air supply outlet 12 is a spherical diffuser with a diameter of 500mm, installed 50cm to the left of the air conditioner return air outlet; exhaust outlet 13 of the exhaust duct is an aluminum alloy return air louver with a diameter of 800mm×400mm, installed in the corner of the climate room away from the indoor unit of the air conditioner; the fresh air volume is designed to be 1000m³ / h. 3 / h, exhaust air volume is designed to be 800m³ / h. 3 / h, maintain a slight positive pressure indoors (pressure difference 5-10Pa). (8) Top-mounted growth lights 14: Select 400W LED growth lights, evenly arrange 25 lights, with a spacing of 2m×2m. The working process of this embodiment is as follows: The top-mounted growth lamp and the indoor air conditioning unit are turned on. The heat generated by the top-mounted growth lamp raises the indoor temperature to 35°C. After the indoor air conditioning unit starts, it draws in 35°C indoor air through the return air vent, cools it to 25°C, and then sends it into the top interlayer cavity. The supply fan sends the 25°C cold air into the side interlayer cavity of the side supply air wall, and then introduces it into the bottom interlayer cavity 17 of the raised floor. Under the action of the supply fan, the cavity maintains a positive pressure of 20-25Pa, and sends it upward at a uniform speed of 0.3m / s through the air outlet. During the upward process, the cold air absorbs the heat from the growth lamp and the indoor heat, and the temperature rises to 32-35°C. It is then drawn in by the return air vent of the indoor air conditioning unit for cooling, forming a stable circulation. At the same time, fresh air from outside is sent in through the diffuser and directly enters the return air vent of the indoor air conditioning unit. It mixes with the indoor air, cools it, and then participates in the circulation. Some of the indoor air is discharged through the exhaust vent, maintaining a slightly positive pressure environment. Tests showed that the temperature deviation in each area of ​​the climate chamber in this embodiment is ≤ ±0.5℃, and the temperature uniformity is significantly better than that of the prior art. The equipment is integrated into the top interlayer cavity, and the effective indoor area reaches 98㎡, which increases the utilization rate by more than 15%.

[0023] Example 2 For 50m 2 This small artificial climate chamber for scientific research (10m long × 5m wide × 3m high) features an adjustable air supply vent design on the raised floor. The vents are adjustable louvers, and the opening can be adjusted in different areas through on-site testing to ensure airflow uniformity deviation is ≤±5%. The fresh air supply outlet uses a strip diffuser, installed above the return air vent of the indoor air conditioning unit, with a fresh air volume of 500m³. 3 / h, exhaust air volume 400m³ 3 / h; the rest of the structure is the same as in Example 1. This example can adapt to the airflow requirements of different experimental scenarios through adjustable air supply holes, which is more flexible.

[0024] Example 3 For high-temperature and high-humidity experimental scenarios, a steam humidifier is added to the side cavity of the side-supply wall, and the steam humidifier is linked to the indoor unit of the air conditioner and the supply fan for control. The enclosure structure uses 75mm thick polyurethane insulation sandwich panels to improve the thermal insulation effect. The diameter of the air supply holes in the raised floor is increased to 8mm, and the air supply speed is increased to 0.5m / s to accelerate airflow circulation and maintain the stability of the high-humidity environment. The rest of the structure is the same as in Example 1. This embodiment can meet the requirements of high-temperature and high-humidity experiments at 30-40℃ and relative humidity of 80%-95%.

[0025] The embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A return air flow circulation structure of an artificial climate chamber, comprising a building envelope, a side air supply wall, a sandwich panel, a raised floor, an air conditioning indoor unit and an air supply fan, characterized in that: The enclosure comprises a roof, a floor and four support walls fixedly connected between the roof and the floor, two side air supply walls, a sandwich plate and a raised floor, the side air supply walls are fixed to the bottom surface of the roof, side sandwich cavities are arranged between the side air supply walls and the support walls, the sandwich plate is fixedly arranged in the space surrounded by the roof and the two side air supply walls and located at the top of the side air supply walls, top sandwich cavities are arranged between the sandwich plate and the roof, the top of the side air supply walls is provided with air vents for connecting the top sandwich cavities and the side sandwich cavities, the raised floor is fixedly arranged at the bottom of the two side air supply walls, bottom sandwich cavities are arranged between the raised floor and the floor, the bottom sandwich cavities are connected with the side sandwich cavities, and the space surrounded by the raised floor, the sandwich plate and the two side air supply walls is an experimental area.

2. The supply and return air flow circulation structure of a climatic chamber according to claim 1, characterized in that: The bottom of the air conditioner indoor unit is a return air outlet, and the return air outlet penetrates the sandwich plate downward and is connected with the experimental area; the left and right sides of the air conditioner indoor unit are air outlets.

3. The supply and return air flow circulation structure of a climatic chamber according to claim 2, characterized in that: A fresh air supply pipeline is arranged in the top sandwich cavity, the fresh air supply pipeline is arranged close to the air conditioner indoor unit, and the bottom of the fresh air supply pipeline is a fresh air supply outlet, which penetrates the sandwich plate downward and is connected with the experimental area.

4. The supply and return air flow circulation structure of a climatic chamber according to claim 3, characterized in that: An exhaust pipeline is also arranged in the top sandwich cavity, the exhaust pipeline is arranged away from the air conditioner indoor unit, and the bottom of the exhaust pipeline is an exhaust outlet, which penetrates the sandwich plate downward and is connected with the experimental area.

5. The supply and return air flow circulation structure of a climatic chamber according to claim 4, characterized in that: A return air shutter and an air filter screen are arranged at the return air outlet of the air conditioner indoor unit, a diffuser is arranged at the fresh air supply outlet of the fresh air supply pipeline, and an exhaust shutter is arranged at the exhaust outlet of the exhaust pipeline.

6. The supply and return air flow circulation structure of a climatic chamber according to claim 1, characterized in that: A plurality of overhead growth lamps are arranged at the top of the experimental area.

7. The supply and return air flow circulation structure of a climatic chamber according to claim 1, characterized in that: A plurality of air supply holes are arranged on the raised floor.

8. The supply and return air flow circulation structure of a climatic chamber according to claim 1, characterized in that: The support walls and the roof of the enclosure are made of insulation boards, and the outer part of the floor is provided with an insulation layer.

9. The supply and return air flow circulation structure of a climate chamber according to claim 1, characterized in that: The side air supply walls and the sandwich plate are made of purification boards with heat insulation effect, and the raised floor is made of anti-static floor.

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