Airflow structure and airflow device for low-temperature environment

Abstract

The utility model relates to the technical field of smoke exhaust, and provides an airflow structure and an airflow device for a low-temperature environment. The airflow structure for the low-temperature environment comprises a frame, a heat preservation plate and a driving mechanism, and the frame is used for being installed on a suspended ceiling in a sealed mode; the insulation board is movably connected with the frame, so that the insulation board has an open state and a closed state, and when the insulation board is in the closed state, the insulation board is hermetically connected with the frame; the driving mechanism is connected with the frame and the heat preservation plate to drive the heat preservation plate to be in an open state and a closed state. According to the airflow structure for the low-temperature environment, the heat preservation plate is connected with the frame in the sealed mode when in the closed state, and the sealing performance of the airflow structure is improved; by arranging the driving mechanism, when smoke exists in a room, the heat preservation plate can be controlled to be in an open state so as to conduct ventilation and smoke exhaust, when no smoke exists in the room, the heat preservation plate can be controlled to be in a closed state, and the indoor heat preservation effect is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke exhaust, in particular to an air flow structure and an air flow device for low-temperature environments. Background Art

[0002] In the fire smoke exhaust systems in fields such as cold chain logistics, food processing, biopharmaceuticals, ice skating and skiing, whether it is a cold storage, a sorting area, or an ice skating and skiing rink, fire smoke exhaust ducts and air outlets need to extend into the room. However, due to the large temperature difference between indoors and outdoors, dew condensation is likely to occur on the ducts and air outlets. Currently, the commonly used anti-dew condensation measures are: installing electric airtight thermal insulation valves on the galvanized ducts at the intersection of the corridor and the cold storage partition wall, and near the outer wall of the sorting area. These valves are opened during ventilation and fresh air supply and closed usually to prevent a large amount of outdoor air from penetrating into the low-temperature area.

[0003] The smoke exhaust outlets are opened automatically or manually and are located on the outer wall or roof of the building, which are openings used to exhaust the smoke and hot air generated by a fire. There are mainly two types of smoke exhaust outlets: plate-type smoke exhaust outlets and multi-blade smoke exhaust outlets. With the continuous in-depth development of industries such as cold chain logistics, food processing, biopharmaceuticals, ice skating and skiing, there is currently no thermal insulation and airtight smoke exhaust outlet for low-temperature working conditions on the market. Only ordinary normally open louvers, multi-blade smoke exhaust outlets, plate-type smoke exhaust outlets and other air outlets can be used. These smoke exhaust outlets have poor airtightness and poor thermal insulation performance, and cannot achieve cold bridge breaking between the air outlet and the ventilation duct. They still transfer cold and heat, resulting in condensation and dew formation, causing water accumulation around the air outlet, and the condensed water dripping from the air outlet position, affecting the quality of goods and normal operations. Long-term operation leads to bacterial growth and pipeline corrosion, causing property losses and personal injuries. At the same time, the low-temperature cold air indoors will "run cold" along the ventilation duct, resulting in increased energy consumption and increased operating costs of the refrigeration system. Based on this, developing a smoke exhaust outlet with strong sealing performance and strong thermal insulation performance has become an urgent problem to be solved in the industry. Summary of the Utility Model

[0004] The utility model provides an air flow structure and an air flow device for low-temperature environments to solve the defects of poor airtightness and poor heat preservation ability of the air flow structure in the prior art.

[0005] The utility model provides an air flow structure for low-temperature environments, including: a frame for sealing installation on the ceiling; a thermal insulation board movably connected to the frame so that the thermal insulation board has an open state and a closed state. When the thermal insulation board is in the open state, the gap between the thermal insulation board and the frame is used for gas flow. When the thermal insulation board is in the closed state, the thermal insulation board is hermetically connected to the frame; a driving mechanism connected to the frame and the thermal insulation board to drive the thermal insulation board to be in the open state and the closed state.

[0006] According to an air flow structure for a low-temperature environment provided by the present utility model, grooves are respectively arranged on opposite sides of the frame, and each groove is provided with a driving mechanism which can slide in the groove to enable the heat preservation plate to be in the open state or the closed state.

[0007] According to an air flow structure for a low-temperature environment provided by the present utility model, each driving mechanism includes: a rack which is arranged in the groove and can slide in the groove; a gear which is in transmission connection with the rack; a motor which is connected with the gear; and a push rod, wherein the first end of the push rod is connected with the rack, and the second end of the push rod is rotatably connected with the heat preservation plate.

[0008] According to an air flow structure for a low-temperature environment provided by the present utility model, it further includes: a smoke sensor for monitoring the smoke in the cold storage; a carbon dioxide concentration sensor for monitoring the carbon dioxide concentration in the room; a temperature sensor for monitoring the temperature in the cold storage; and a controller which is electrically connected with the smoke sensor, the carbon dioxide concentration sensor, the temperature sensor and the driving mechanism.

[0009] According to an air flow structure for a low-temperature environment provided by the present utility model, the heat preservation plate is of a multi-layer structure, and the middle layer of the multi-layer structure is a heat preservation layer.

[0010] According to an air flow structure for a low-temperature environment provided by the present utility model, when the heat preservation plate is in the open state, the maximum opening angle of the heat preservation plate is 70°.

[0011] The present utility model further provides an air flow device for a low-temperature environment, which includes: a box body which is used for being hermetically installed on a ceiling, and the surface of the box body flush with the ceiling is provided with a plurality of installation holes, and the surface of the box body parallel to the ceiling is provided with an interface flange; a pipeline which is connected with the interface flange; and a plurality of air flow structures for a low-temperature environment as described above, and each air flow structure is hermetically arranged in one of the installation holes.

[0012] According to an air flow device for a low-temperature environment provided by the present utility model, the outside of the box body is covered with cold insulation material, and the interface flange is wound with the cold insulation material.

[0013] According to an air flow device for a low-temperature environment provided by the present utility model, the interface flange is wound with the cold insulation material.

[0014] According to an air flow device for a low-temperature environment provided by the present utility model, the box body is further provided with a maintenance door which can be opened and closed.

[0015] The air flow structure for low-temperature environment provided by the present utility model improves the sealing performance of the air flow structure by sealingly connecting the frame with the ceiling and sealingly connecting the heat preservation board with the frame when in the closed state; by setting a driving mechanism, when there is smoke in the room, the heat preservation board can be controlled to be in the open state for ventilation and smoke exhaust, and when there is no smoke in the room, the heat preservation board can be in the closed state, enhancing the heat preservation effect in the room; the air flow structure for low-temperature environment provided by the present utility model can be used in normal-temperature places and low-temperature places, effectively solving the problems of condensation and icing at the air outlet facing the cold storage, reducing the energy consumption of the refrigeration system, improving the mildew phenomenon caused by condensation in some positions, and ensuring the practical effect of the fire-fighting air flow structure in low-temperature places. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 FIG. is a schematic structural diagram of the air flow structure for low-temperature environment provided by the present utility model when in the closed state.

[0018] Figure 2 FIG. is a schematic structural diagram of the air flow structure for low-temperature environment provided by the present utility model when in the open state.

[0019] Figure 3 FIG. is a schematic structural diagram of the air flow device for low-temperature environment provided by the present utility model.

[0020] REFERENCE NUMERALS:

[0021] 10: Frame; 21: First sealing gasket; 22: Second sealing gasket; 30: Heat preservation board; 40: Driving mechanism;

[0022] 100: Box body; 101: Interface flange; 102: Inspection door; 200: Ceiling; 201: Mushroom nail. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the objectives, technical solutions and advantages of the present utility model clearer, the following will clearly and completely describe the technical solutions in the present utility model in conjunction with the drawings in the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present utility model belong to the scope of protection of the present utility model.

[0024] The following combines Figures 1-3 to describe the air flow structure and air flow device for low - temperature environments of the present utility model.

[0025] As Figure 1 and Figure 2 shown, in an embodiment of the present utility model, the air flow structure for a low - temperature environment includes: a frame 10, a heat - insulating board 30, and a driving mechanism 40. The frame 10 is used for sealing installation on a ceiling 200. The heat - insulating board 30 is movably connected to the frame 10, so that the heat - insulating board 30 has an open state and a closed state. When the heat - insulating board 30 is in the open state, the gap between the heat - insulating board 30 and the frame 10 is used for gas flow. When the heat - insulating board 30 is in the closed state, the heat - insulating board 30 is hermetically connected to the frame 10. The driving mechanism 40 is connected to the frame 10 and the heat - insulating board 30 to drive the heat - insulating board 30 to be in the open state and the closed state.

[0026] Specifically, the air flow structure for a low - temperature environment provided by the embodiment of the present utility model can be used in normal - temperature environments and low - temperature environments. In this embodiment, the low - temperature environment refers to an environment with a temperature of - 60°C to 20°C, which can solve problems such as cold bridges, cold insulation, condensation, and icing in indoor low - temperature ventilation, air - conditioning, and smoke exhaust systems in cold storages, laboratories, ski resorts, and public or industrial buildings in severe cold and cold regions. In the embodiment of the present utility model, the gas includes carbon dioxide, flue gas, etc.

[0027] In this embodiment, the frame 10 and the heat - insulating board 30 are constructed into a structure similar to a window. The frame 10 is installed on the ceiling 200, and a first sealing gasket 21 is provided between the frame 10 and the ceiling 200 to achieve a sealed connection between the frame 10 and the ceiling 200. The first sealing gasket 21 can block the hot air outside the air outlet to prevent the hot air from passing through the hole in the ceiling 200 and mixing with the cold air in the cold room, resulting in condensation and cold bridges. The heat - insulating board 30 is movably connected to the frame 10, so that the heat - insulating board 30 has an open state and a closed state. When the heat - insulating board 30 is in the open state, ventilation or smoke exhaust can be carried out, thus forming a ventilation opening or a smoke exhaust opening. When ventilation or smoke exhaust is required indoors, the driving mechanism 40 controls the movement of the heat - insulating board 30 to make the heat - insulating board 30 in the open state; when the ventilation and smoke exhaust periods end, the heat - insulating board 30 is in the closed state. A second sealing gasket 22 is provided around the heat - insulating board 30. When the heat - insulating board 30 is in the closed state, the second sealing gasket 22 fills the closing gap to increase airtightness, improve the sealing performance of the ventilation opening or the smoke exhaust opening, make the heat - insulating board 30 hermetically connected to the frame 10, prevent the indoor cold air from flowing outdoors, and improve the indoor heat - preservation effect. At the same time, the second sealing gasket 22 can also reduce the noise generated by the impact when the heat - insulating board 30 is closed.

[0028] Furthermore, an electric heating wire is provided inside the frame 10 to prevent the heat - insulating board 30 from freezing to the frame 10 and being unable to open the heat - insulating board 30.

[0029] Further, in the embodiments of the present utility model, the form of the driving mechanism 40 can be various. When the size of the heat preservation board 30 is small, one end of the heat preservation board 30 is rotatably connected to the frame 10, and the driving mechanism 40 is connected to the other end of the heat preservation board 30 to drive the heat preservation board 30 to rotate, so that the heat preservation board 30 is in an open state; when the size of the heat preservation board 30 is large, driving mechanisms 40 can be arranged on both sides of the heat preservation board 30, and the driving mechanisms 40 on both sides drive the heat preservation board 30 to rotate simultaneously, so that the heat preservation board 30 is in an open state; optionally, under the action of the driving mechanism 40, the heat preservation board 30 can also translate relative to the ceiling 200, so that the heat preservation board 30 is in an open state. Optionally, the driving mechanism 40 can be in the form of chain drive, built-in screw drive, push rod drive or curtain wall window opener, etc.

[0030] Optionally, in the embodiments of the present utility model, the material of the frame 10 can be carbon steel plate or stainless steel plate. During a fire, the frame 10 can prevent deformation and failure, and the thickness of the frame 10 should not be less than 2 mm.

[0031] Optionally, in the embodiments of the present utility model, the materials of the first sealing gasket 21 and the second sealing gasket 22 can be rubber, P55, HDPE, etc.

[0032] The air flow structure for low-temperature environment provided by the embodiments of the present utility model improves the sealing performance of the air flow structure by sealingly connecting the frame to the ceiling and sealingly connecting the heat preservation board to the frame when the heat preservation board is in a closed state; by setting the driving mechanism, when the ventilation condition, temperature or smoke concentration reaches the smoke exhaust standard, the heat preservation board can be controlled to be in an open state for ventilation and smoke exhaust, and when the ventilation condition, temperature or smoke concentration is lower than the smoke exhaust standard, the heat preservation board can be in a closed state to enhance the heat preservation effect in the room; the air flow structure for low-temperature environment provided by the embodiments of the present utility model can be used in normal-temperature places and low-temperature places, effectively solves the problems of condensation and icing at the air outlet facing the cold room, reduces the energy consumption of the refrigeration system, improves the phenomenon of mildew due to condensation at some positions, and ensures the practical effect of the fire-fighting air flow structure in low-temperature places.

[0033] In the embodiments of the present utility model, grooves are respectively provided on opposite sides of the frame 10, and a driving mechanism 40 is arranged in each groove. The driving mechanism 40 can slide in the groove to make the heat preservation board 30 in an open state or a closed state.

[0034] Specifically, in this embodiment, one end of the heat preservation board 30 is rotatably connected to the frame 10, and the other end is a free end. Both sides of the heat preservation board 30 are respectively connected to a driving mechanism 40. When the driving mechanism 40 moves forward, it drives the fixed end of the heat preservation board 30 to rotate, so that the heat preservation board 30 is in an open state, forming a smoke exhaust port or a ventilation port; when the driving mechanism 40 moves backward, it drives the fixed end of the heat preservation board 30 to rotate, so that the heat preservation board 30 is in a closed state to close the smoke exhaust port or the ventilation port.

[0035] Further, each driving mechanism 40 includes: a motor, a gear, a rack and a push rod. The motor is connected to the gear and is used to drive the gear to rotate. The gear meshes with the rack. The rack is arranged in the groove. One end of the push rod is connected to the rack, and the other end is rotatably connected to the heat preservation board 30. When the motor rotates, it drives the gear to rotate. The gear and the rack are in transmission, driving the rack to move in the groove, and then driving the push rod to move, so as to open or close the heat preservation board 30. Optionally, in this embodiment, when the motor rotates forward, it drives the rack to move forward, and then the heat preservation board 30 is in an open state. When the motor rotates in reverse, it drives the rack to move backward, and then the heat preservation board 30 is in a closed state.

[0036] Optionally, in another embodiment of the present utility model, slide rails can also be arranged in each groove. A pair of sliders are arranged on the heat preservation board 30. Each slider can move along the slide rail to drive the heat preservation board 30 to be parallel to the slide rail to form a ventilation and smoke exhaust port.

[0037] Optionally, in another embodiment of the present utility model, magnetic parts are arranged in the groove. When electrified, the magnetic parts drive the heat preservation board 30 to rotate by using magnetism, so that the heat preservation board 30 is in a closed state; when powered off, the magnetism of the magnetic parts disappears, and the heat preservation board 30 is in an open state by relying on the action of gravity.

[0038] In the embodiment of the present utility model, the air flow structure for a low-temperature environment further includes: a smoke sensor, a carbon dioxide concentration sensor, a temperature sensor and a controller. The smoke sensor, the carbon dioxide concentration sensor and the temperature sensor are all arranged in the cold room. The smoke sensor is used to monitor the smoke in the room. When the smoke in the room exceeds the standard, the smoke sensor sends a signal to the controller, and the controller controls the driving mechanism 40 to act, so that the heat preservation board 30 is in an open state. The carbon dioxide concentration sensor is used to detect the carbon dioxide concentration in the room. When the carbon dioxide concentration in the room exceeds the standard, the carbon dioxide concentration sensor sends a signal to the controller, and the controller controls the driving mechanism 40 to act, so that the heat preservation board 30 is in an open state.

[0039] The temperature sensor is used to detect the temperature in the room. When the temperature in the room exceeds the standard, the temperature sensor sends a signal to the controller, and the controller controls the driving mechanism 40 to act, so that the heat preservation board 30 is in an open state.

[0040] The air flow structure for low-temperature environment provided by the embodiment of the present utility model can automatically control the insulation board to be in an open state or a closed state according to the concentration or temperature of indoor smoke by setting a smoke sensor, a temperature sensor and a controller, avoiding the harm caused by manual operation and smoke to the human body and improving the safety of operation.

[0041] Further, when the air flow structure is used as a ventilation opening, the opening angle of the insulation board 30 is usually less than or equal to 30°. When exhausting smoke, in order to improve the smoke exhaust effect, when the insulation board 30 is in an open state, the opening angle of the insulation board 30 should be larger. In the embodiment of the present utility model, the maximum opening angle of the insulation board 30 is 70°.

[0042] Further, in the embodiment of the present utility model, the insulation board 30 is a multi-layer structure. The middle layer of the multi-layer structure is an insulation layer, and the material of the insulation layer can be polyurethane, rock wool, glass wool, ceramics, aerogel, etc. The two sides of the insulation layer can be carbon steel plates, stainless steel plates, aluminum alloy plates, or ABS plates. The thickness of the insulation layer can be 10 mm - 100 mm.

[0043] As Figure 2 shown, in the embodiment of the present utility model, the ceiling 200 is installed on the roof of the cold room through mushroom nails 201, and the mushroom nails 201 have the effect of isolating heat and cold. Plastic screws have the characteristics of insulation, non-magnetic, corrosion resistance, beauty, non-rusting, etc. Modified engineering plastics have comparable use strength and impact resistance to metals. Plastic screws are commonly known as nylon screws. After adding 30% glass fiber, their mechanical properties are far superior to ordinary nylon. The materials used for plastic screws are becoming more and more diverse, their performance is constantly improved, and their application fields are also becoming wider and wider.

[0044] As Figure 3 shown, the embodiment of the present utility model also provides an air flow device for low-temperature environment, including: a box body 100, a pipeline and a plurality of air flow structures. The box body 100 is used for being hermetically installed on the ceiling 200. A plurality of installation holes are provided on the surface of the box body 100 flush with the ceiling 200, and each installation hole is hermetically installed with an air flow structure. An interface flange 101 is provided on the surface of the box body 100 parallel to the ceiling 200, and the interface flange 101 is connected to the pipeline.

[0045] Specifically, when installing the ceiling 200, the air flow device can be installed together with the ceiling 200. The box body 100 of the air flow device is hermetically connected to the ceiling 200 through a third gasket to enhance the heat preservation effect in the cold room. A plurality of air flow structures are installed on the surface of the box body 100 flush with the ceiling 200, and each air flow structure is connected to the box body 100 through a fourth gasket, so as to squeeze the fourth gasket by the self-weight of the air flow structure, thereby enhancing the sealing performance of the air flow device. When the smoke or temperature in the cold room exceeds the standard, a plurality of air flow structures are opened simultaneously to discharge the smoke into the box body 100, and the pipeline is connected to the smoke exhaust fan to discharge the smoke in the box body 100 through the smoke exhaust fan.

[0046] Further, the box body 100 is provided with an air supply port, the air supply port is communicated with the air duct, the air supply port is provided with a flange ring, one end of the interface flange 101 is connected to the flange ring, and the other end of the interface flange 101 is connected to the pipeline.

[0047] The air flow device for a low-temperature environment provided by the embodiment of the present utility model improves the sealing performance of the air flow structure by hermetically connecting the air flow device to the ceiling and hermetically connecting the air flow structure to the box body, and can control a plurality of air flow structures to be in an open state for ventilation and smoke exhaust when the ventilation condition, temperature or smoke concentration reaches the smoke exhaust standard, while in a non-ventilation condition, when the temperature and smoke concentration are lower than the smoke exhaust standard, the air flow structure can be in a closed state, enhancing the heat preservation effect in the room.

[0048] Further, in the embodiment of the present utility model, the box body 100 is fixed on the ceiling 200 through ear rings and self-tapping screws.

[0049] Further, in the embodiment of the present utility model, the box body 100 can also be a heat preservation box body, and the outside of the box body 100 is covered with cold insulation materials.

[0050] Specifically, the cold insulation material can be a rubber pad, titanium silicate cloth, fiberglass, nylon or ceramic, etc. The cold insulation material covers the remaining surfaces of the box body 100 except the surface where the air flow structure is installed, so as to play a role in blocking the conduction heat and realize the cold bridge break.

[0051] Further, the outside of the interface flange 101 is also wound with cold insulation materials. On the one hand, the cold insulation materials can ensure the overall airtightness of the air supply port to a certain extent, and at the same time, they can also form an integral body with the cold insulation materials outside the box body 100, strengthening the effect of the broken bridge heat preservation and realizing the cold bridge break of the whole air flow device.

[0052] As Figure 3 shown, in the embodiment of the present utility model, the box body 100 is further provided with a maintenance door 102, the maintenance door 102 is normally closed, and can be opened during maintenance or manual ventilation, and the maintenance needs to be carried out during non-ventilation periods.

[0053] The air flow device for low-temperature environments provided by the embodiments of the present utility model improves the problems of poor sealing of ordinary ventilation, air conditioning, and smoke exhaust air outlets in low-temperature environments, inability to isolate cold and heat, and easy icing and condensation. It provides a reliable guarantee for ventilation and smoke exhaust in low-temperature places of -60°C to 20°C, fills the gap of domestic low-temperature integrated thermal insulation and airtight air outlets, has high potential market profits, can be made into actual products for promotion at home and abroad, and has broad prospects. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. An airflow structure for low temperature environment, characterized in that: include: A frame, the frame being used for sealing and mounting on a suspended ceiling; A heat preservation plate, movably connected to the frame, so that the heat preservation plate has an open state and a closed state, when the heat preservation plate is in the open state, a gap between the heat preservation plate and the frame is used for gas flow, and when the heat preservation plate is in the closed state, the heat preservation plate is sealed and connected to the frame; A driving mechanism is connected to the frame and the heat preservation board to drive the heat preservation board to be in the open state and the closed state.

2. The airflow structure for low temperature environment according to claim 1, characterized in that: Grooves are respectively arranged on opposite sides of the frame, and a driving mechanism is arranged in each of the grooves. The driving mechanism can slide in the grooves to put the heat preservation board in the open state or the closed state.

3. The airflow structure for low temperature environment according to claim 2, characterized in that: Each of the driving mechanisms comprises: A rack, disposed in the groove and slidable in the groove; A gear, drivingly connected to the rack; a motor connected to the gear; A push rod, wherein the first end of the push rod is connected to the rack, and the second end of the push rod is rotatably connected to the insulation board.

4. The airflow structure for low temperature environment according to claim 1, characterized in that: Also includes: Smoke sensors to monitor smoke in cold rooms; Carbon dioxide concentration sensor, used to monitor indoor carbon dioxide concentration; Temperature sensor, used to monitor the temperature in the cold room; A controller is electrically connected to the smoke sensor, the carbon dioxide concentration sensor, the temperature sensor and the driving mechanism.

5. The airflow structure for low temperature environment according to claim 1, characterized in that: The thermal insulation board is a multi-layer structure, and the middle layer of the multi-layer structure is a thermal insulation layer.

6. The airflow structure for low temperature environment according to claim 1, characterized in that: When the heat preservation plate is in the open state, the maximum opening angle of the heat preservation plate is 70°.

7. An airflow device for low temperature environment, characterized in that: include: A box body, the box body is used for sealing installation on the suspended ceiling, a surface of the box body flush with the suspended ceiling is provided with a plurality of installation holes, and a surface of the box body parallel to the suspended ceiling is provided with an interface flange; A pipeline connected to the interface flange; An airflow structure for a low-temperature environment according to any one of claims 1 to 6, wherein each of the airflow structures is sealed in one of the mounting holes.

8. The airflow device for low temperature environment according to claim 7, characterized in that: The outside of the box is covered with cold insulation material.

9. The airflow device for low temperature environment according to claim 8, characterized in that: The interface flange is wrapped with the cold insulation material.

10. The airflow device for low temperature environment according to claim 7, characterized in that: The box body is also provided with an inspection door, and the inspection door can be opened and closed.

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