Air curtain system

Abstract

According to the air curtain system provided by the utility model, the structure of the air curtain system is improved, so that the energy efficiency and the blocking effect of the air curtain system are improved. The air curtain system can be switched between a first working condition and a second working condition; the air curtain system comprises an upper ventilation part, a lower ventilation part, a positive pressure output end, a negative pressure suction end and an air source, the positive pressure output end and the negative pressure suction end are both communicated with the outside, the air source is provided with an air outlet and a suction side, the air outlet is communicated with the positive pressure output end, and the suction side is communicated with the negative pressure suction end; under the first working condition, the upper ventilation part serves as the positive pressure output end, and the lower ventilation part serves as the negative pressure suction end; and in the second working condition, the lower ventilation part serves as the positive pressure output end, and the upper ventilation part serves as the negative pressure suction end.

Description

Technical Field

[0001] The utility model relates to the technical field of air conveying devices, and particularly to an air curtain system. Background Art

[0002] An air curtain system, also known as an air curtain or an air curtain machine, is a device that forms an invisible barrier through a high-speed air flow. It is widely used at the entrances and exits of commercial buildings, industrial factories, public places, etc. The aim is to effectively isolate the indoor and outdoor environments, prevent the convection of cold and hot air, reduce the intrusion of dust, insects and harmful gases, and at the same time maintain the cleanliness and comfort of the indoor environment. Its core principle is to use a specially designed high-speed motor to drive the wind wheel to rotate, generating a powerful air flow barrier to form an invisible "curtain door".

[0003] However, traditional air curtain systems generally adopt a unidirectional air supply mode, that is, the air flow blows out only from one side to form an air flow barrier. In order to achieve sufficient blocking effect, the unidirectional air supply air curtain system often requires a large air volume and air speed, so the power consumption of the motor is relatively high. Long-term operation increases the energy cost. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an air curtain system, which improves the energy efficiency and blocking effect of the air curtain system by improving the structure of the air curtain system.

[0005] To achieve the above purpose, the utility model provides an air curtain system, which can switch between a first working condition and a second working condition; the air curtain system includes an upper ventilation part, a lower ventilation part, a positive pressure output end, a negative pressure suction end and an air source. The positive pressure output end and the negative pressure suction end are both connected to the outside. The air source has an air outlet and an air suction port. The air outlet is connected to the positive pressure output end, and the air suction port is connected to the negative pressure suction end; in the first working condition, the upper ventilation part serves as the positive pressure output end, and the lower ventilation part serves as the negative pressure suction end; in the second working condition, the lower ventilation part serves as the positive pressure output end, and the upper ventilation part serves as the negative pressure suction end.

[0006] By adopting the air curtain system in this application, on the one hand, it can make the upper ventilation part and the lower ventilation part form a relatively closed air flow cycle, reduce the dependence on and waste of external fresh air, and at the same time reduce the energy consumed by the air source to maintain the air curtain; on the other hand, the air curtain system in this application has two working conditions. In the two working conditions, the positive pressure output end and the negative pressure suction end are swapped, so as to adapt to the change of seasons, and utilize the temperature difference between the air flow output by the positive pressure output end and the environmental air flow, and use the principle that cold air sinks and hot air rises to further improve the energy-saving effect of the air curtain system.

[0007] Optionally, a plurality of ventilation openings are provided in both the upper ventilation part and the lower ventilation part, and the ventilation openings in the upper ventilation part and the ventilation openings in the lower ventilation part are arranged opposite to each other along a set direction. In this way, the air flow can be recycled during circulation, and the air curtain system with the ventilation openings arranged opposite to each other can reduce the dependence on and waste of fresh air from the outside. Thus, on the premise of maintaining the same blocking effect, the air curtain system can consume less energy.

[0008] Optionally, at least one of the upper ventilation part and the lower ventilation part is provided with a wind guiding structure, the wind guiding structure includes a plurality of wind guiding plates, the plurality of wind guiding plates can rotate relative to the corresponding ventilation part, and a ventilation opening is defined between two adjacent wind guiding plates. In this way, the installation tolerance can be compensated, and the ventilation openings of the upper ventilation part and the lower ventilation part can always be arranged opposite to each other.

[0009] Optionally, both the upper ventilation part and the lower ventilation part include an air flow cavity and a filtering cavity, a filtering element is arranged in the filtering cavity, the filtering cavity is communicated with the air source through the air flow cavity and is communicated with the outside through the ventilation opening. In this way, the gas entering the air source can be filtered, and the service life of the air source can be prolonged.

[0010] Optionally, a heat exchange element is further arranged in the air flow cavity, the heat exchange element has a refrigerating working position and a heating working position for exchanging heat with the gas flowing through the air flow cavity to increase or decrease the temperature of the gas; in the first working condition, the heat exchange element in the upper ventilation part is in the refrigerating working position; in the second working condition, the heat exchange element in the lower ventilation part is in the heating working position.

[0011] Thus, the temperature of the air flow at the output end is precisely controlled by the heat exchange element to form a temperature difference between the output end and the ambient temperature, thereby utilizing the physical laws that cold air sinks and hot air rises, ensuring that the air flow direction between the upper ventilation part and the lower ventilation part follows the above physical laws, optimizing the internal air flow distribution of the air curtain system, reducing the overall energy consumption of the system, and improving the energy utilization efficiency.

[0012] Optionally, the upper ventilation part and the lower ventilation part are vertically distributed up and down, the lower ventilation part is arranged below the upper ventilation part; the lower ventilation part further includes a dust collection cavity, the ventilation opening of the lower ventilation part is communicated with the filtering cavity through the dust collection cavity, and the ventilation opening is located at the top of the dust collection cavity; at least one dust falling area is arranged in the dust collection cavity, the dust falling area is vertically located below the ventilation opening; the projection range formed by vertically projecting the dust falling area is smaller than the projection range formed by projecting the dust collection cavity. By arranging the dust falling area, large particle dust is prevented from falling into the filtering cavity.

[0013] Optionally, the top of the dust collection chamber has an opening area, and the ventilation opening is located in the opening area; the projection formed by vertically projecting the opening area is within the projection formed by projecting the dust falling area, so as to prevent the dust in the ventilation opening from directly entering the filter chamber without passing through the dust falling area and causing filter blockage.

[0014] Optionally, a plurality of recesses and protrusions are arranged at intervals in the dust collection chamber, and the recesses and the protrusions are connected to form a wavy structure or a serrated structure, and the recesses serve as the dust falling areas. In this way, the depth of the dust falling area can be reduced, and the volume of the dust falling area can be ensured to remain unchanged by increasing the number of dust falling areas.

[0015] Optionally, the vertical distance between the highest point of the protrusion and the top of the dust collection chamber is between 10 cm and 15 cm. In this way, the wind speed in the dust falling area can be reduced, and the dust particles in the dust falling area can be prevented from flying.

[0016] Optionally, it includes a first channel and a second channel. The first channel is used to connect the air outlet and the upper ventilation part, and the second channel is used to connect the air suction port and the lower ventilation part;

[0017] It further includes a third channel, and the third channel is used to connect the first channel and the second channel. The position where the third channel is connected to the first channel is defined as the first connection position, and the position where it is connected to the second channel is defined as the second connection position; it further includes a fourth channel, one end of the fourth channel is connected to the first channel, and the other end is connected to the air suction port. The position where the fourth channel is connected to the first channel is defined as the third connection position, and the third connection position is located between the first connection position and the upper ventilation part; a fourth valve is arranged in the first channel, and the fourth valve is located between the first connection position and the third connection position; a second valve is arranged in the second channel, and the second valve is located between the air suction port and the second connection position; a third valve is arranged in the third channel; a first valve is arranged in the fourth channel; each valve has an open position and a closed position: in the first working condition, the first valve and the third valve are in the closed position, and the second valve and the fourth valve are in the open position; in the second working condition, the first valve and the third valve are in the open position, and the second valve and the fourth valve are in the closed position.

[0018] Through the channel layout method and the valve layout method in this application, the integration degree of the channel distribution of the air curtain system is improved. Description of the Drawings

[0019] The accompanying drawings incorporated in and forming a part of this specification illustrate embodiments of the specification and, together with the description thereof, are used for the connection schematic diagram of the air curtain system.

[0020] Figure 1 It is a schematic structural diagram of the motor support tooling in an embodiment of the present utility model;

[0021] Figure 2 It is a schematic structural diagram of the first ventilation part and the second ventilation part in an embodiment;

[0022] Figure 3 It is a projection range diagram of a part of the second ventilation part.

[0023] Reference numerals:

[0024] 1 - Upper ventilation part;

[0025] 2 - Lower ventilation part;

[0026] 3 - Air source; 31, Filter part; 32, Fan; 33, Air outlet; 34, Air suction port;

[0027] 4 - Housing; 41 - Upper wall; 42 - Lower wall; 43 - Ventilation opening; 44 - Air guide plate; 45, Opening area;

[0028] 51 - Air flow cavity; 52 - Filter cavity; 53 - Dust collection cavity; 54 - Dust falling area; 541 - Concave part; 542 - Convex part; 55 - Filter screen; 56 - Heat exchange element;

[0029] 71 - First channel; 72 - Second channel; 73 - Third channel; 74 - Fourth channel;

[0030] 81 - First connection position; 82 - Second connection position; 83 - Third connection position;

[0031] 91 - First valve; 92 - Second valve; 93 - Third valve. Detailed implementation manners

[0032] The present utility model provides an air curtain system. By improving the structure of the air curtain system, the energy efficiency and the blocking effect of the air curtain system are improved.

[0033] In order to enable those skilled in the art to better understand the solution of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0034] Relative terms such as "upper" and "lower" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0035] Please refer toFigures 1 to 3 , Figure 1 is a schematic structural diagram of the motor support tooling in the embodiment of the present utility model; Figure 2 is a schematic structural diagram of the first ventilation part and the second ventilation part in an implementation manner; Figure 3 is a projection range diagram of a part of the second ventilation part.

[0036] The object of the present utility model is to provide an air curtain system. By improving the structure of the air curtain system, the energy efficiency and blocking effect of the air curtain system are improved.

[0037] To achieve the above object, the present utility model provides an air curtain system. The air curtain system includes an upper ventilation part 1, a lower ventilation part 2, a positive pressure output end, a negative pressure suction end, and an air source 3. The air source 3, as a wind force forming device, is, for example, a fan 32. When the fan 32 is working, a high-pressure side is formed on one side of the fan 32, and a low-pressure side is formed on the other side. An air outlet 33 of the air source 3 is provided on the high-pressure side, and an air suction port 34 of the air source 3 is provided on the low-pressure side. The air outlet 33 is communicated with the positive pressure output end, and the air suction port 34 is communicated with the negative pressure suction end. The positive pressure output end is used for blowing air outwards. Under the action of the air source 3, external air can be sucked into the low-pressure side of the air source 3 through the negative pressure suction end. Both the upper ventilation part 1 and the lower ventilation part 2 are provided with ventilation openings 43, and they are communicated with the outside through the ventilation openings 43.

[0038] The air curtain system can be switched between a first working condition and a second working condition. In the first working condition, the upper ventilation part 1 serves as the positive pressure output end, and the lower ventilation part 2 serves as the negative pressure suction end; in the second working condition, the lower ventilation part 2 serves as the positive pressure output end, and the upper ventilation part 1 serves as the negative pressure suction end.

[0039] In a specific example, when the ambient temperature is relatively high, the air curtain system can be switched to the first working condition, and when the ambient temperature is relatively low, the air curtain system can be switched to the second working condition. Specifically, both the upper ventilation part 1 and the lower ventilation part 2 specifically include a heat exchange member 56, which has a refrigeration working position and a heating working position for exchanging heat with the gas flowing through the air passage 51 to increase or decrease the temperature of the gas; in the first working condition, the heat exchange member 56 in the upper ventilation part 1 is located at the refrigeration working position; in the second working condition, the heat exchange member 56 in the lower ventilation part 2 is located at the heating working position. The heat exchange member 56 can be a heat exchange tube of an air conditioner, or other tube bodies that can allow a heat exchange medium to flow through, or an electric heating plate, a water tank cooler, etc. The upper ventilation part 1 and the lower ventilation part 2 include a housing 4, and the heat exchange member 56 is directly or indirectly fixedly connected to the inner wall of the housing 4.

[0040] By adopting the air curtain system in the present application, on the one hand, it can enable the upper ventilation part 1 and the lower ventilation part 2 to form a relatively closed air flow cycle, reducing the dependence on and waste of external fresh air, and at the same time reducing the energy consumption required for the air source 3 to maintain the air curtain; on the other hand, the air curtain system in the present application has two working conditions. In the two working conditions, the positive pressure output end and the negative pressure suction end are swapped, so as to adapt to the change of seasons, and utilize the temperature difference between the air flow output from the positive pressure output end and the ambient air flow, and further improve the energy-saving effect of the air curtain system by using the principle that cold air sinks and hot air rises.

[0041] In a specific embodiment, in order to realize the functions of the air curtain system in the present application, the air curtain system includes a first channel 71 and a second channel 72. The first channel 71 is used to connect the air outlet 33 of the air source 3 with the upper ventilation part 1, and the second channel 72 is used to connect the air suction port 34 of the air source 3 with the lower ventilation part 2.

[0042] The air curtain system further includes a third channel 73. The third channel 73 is used to connect the first channel 71 and the second channel 72. The position where the third channel 73 is connected to the first channel 71 is defined as the first connection position 81, and the position where it is connected to the second channel 72 is defined as the second connection position 82; the air curtain system further includes a fourth channel 74. One end of the fourth channel 74 is connected to the first channel 71, and the other end is connected to the air suction port 34. The position where the fourth channel 74 is connected to the first channel 71 is defined as the third connection position 83, and the third connection position 83 is located between the first connection position 81 and the upper ventilation part 1.

[0043] A first valve 91 is provided in the fourth channel 74, a second valve 92 is provided in the second channel 72, the second valve 92 is located between the air suction port 34 of the air source 3 and the second connection position 82, a third valve 93 is provided in the third channel 73, and a fourth valve 94 is provided in the first channel 71. The fourth valve 94 is located between the first connection position 81 and the third connection position 83. Each valve has an open position and a closed position; in the first working condition (that is, when the ambient temperature is relatively high and the heat exchange element 56 of the first ventilation part 1 switches to the refrigeration working position), the first valve 91 and the third valve 93 are in the closed position, and the second valve 92 and the fourth valve 94 are in the open position; in the second working condition (that is, when the ambient temperature is relatively low and the heat exchange element 56 of the second ventilation part 2 switches to the heating working position), the first valve 91 and the third valve 93 are in the open position, and the second valve 92 and the fourth valve 94 are in the closed position. In this embodiment, each valve is a solenoid valve, and each valve is connected to the controller, and the controller is used to switch each valve between the open position and the closed position. Through the channel layout method and the valve layout method in the present application, the integration degree of the channel distribution of the air curtain system is improved.

[0044] In the above-described embodiments, a plurality of ventilation openings 43 are formed in both the upper ventilation portion 1 and the lower ventilation portion 2. The ventilation openings 43 penetrate the housing 4. Specifically, the ventilation openings 43 respectively penetrate the surfaces of the ventilation portions on the corresponding sides facing each other. Thus, the ventilation openings 43 in the upper ventilation portion 1 and the ventilation openings 43 in the lower ventilation portion 2 are arranged opposite to each other in a set direction. The structure of the ventilation openings 43 can be rectangular, circular, square, etc., and no specific limitation is made here. Among them, the set direction can be horizontal, vertical or any other direction. As long as the ventilation openings 43 are arranged opposite to each other in the set direction, one ventilation portion can blow air and the other ventilation portion can suck air to form a cycle. By adopting such a method, the airflow can be reused in the cycle, and the air curtain system with the ventilation openings 43 arranged opposite to each other can reduce the dependence on and waste of external fresh air. Thus, on the premise of maintaining the same blocking effect, the air curtain system can consume less energy.

[0045] In an alternative embodiment, at least one of the upper ventilation portion 1 and the lower ventilation portion 2 is provided with a wind guiding structure. The wind guiding structure includes a plurality of wind guiding plates 44. The plurality of wind guiding plates 44 can rotate relative to the corresponding ventilation portion. A ventilation opening 43 is defined between two adjacent wind guiding plates 44. That is to say, the respective wind guiding plates 44 are parallel to each other. The two ends of the wind guiding plates 44 are hinged to the housing 4. A driving member and a transmission rod are further arranged in the housing 4. The wind guiding plates 44 are in transmission connection with the driving member through the transmission rod. Thus, the driving member is used to drive the wind guiding plates 44 to swing in a set direction to adjust the air outlet direction of the ventilation openings 43. By such a method, the installation tolerance can be compensated, and the ventilation openings 43 in the upper ventilation portion 1 and the lower ventilation portion 2 can always be arranged opposite to each other.

[0046] As an alternative solution, the air curtain system is arranged on the door body at a set position. The upper ventilation portion 1 and the lower ventilation portion 2 are vertically distributed on the two sides corresponding to the door body in the height direction. The lower ventilation portion 2 is arranged below the upper ventilation portion 1. The housings 4 of the upper ventilation portion 1 and the lower ventilation portion 2 form a rectangular box body and extend along the width direction of the door body. Vertically, the ventilation openings 43 in the upper ventilation portion 1 are arranged on the lower wall 42 of the housing 4 of the upper ventilation portion 1, and the lower ventilation openings 43 are arranged on the upper wall 41 of the housing 4 of the lower ventilation portion 2, thereby forming a blowing and sucking cycle.

[0047] In the above-described embodiments, both the upper ventilation portion 1 and the lower ventilation portion 2 include an air passage chamber 51 and a filtering chamber 52. The air passage chamber 51 is communicated with the air source 3. The filtering chamber 52 is not directly communicated with the air source 3. A filtering member is arranged in the filtering chamber 52. The filtering chamber 52 is communicated with the air source 3 through the air passage chamber 51 and is communicated with the outside through the ventilation openings 43. In this way, the gas entering the air source 3 can be filtered, and the service life of the air source 3 can be improved.

[0048] The air passage cavity 51 and the filter cavity 52 are vertically distributed up and down. Two filter meshes 55 are arranged in the housing 4. The filter meshes 55 extend horizontally. The filter cavity 52 is defined between the two filter meshes 55 in the housing 4 in the vertical direction. The filter cavity 52 is filled with filter fillers such as adsorption cotton and is spatially separated into the air passage cavity 51 and the filter cavity 52. The above-mentioned heat exchange member 56 can be arranged in the air passage cavity 51.

[0049] As a specific embodiment of the upper ventilation part 1, the air guiding structure is arranged in the upper ventilation part 1. Specifically, the ventilation opening 43 arranged on the lower wall 42 is surrounded by the air guiding plate 44. The air guiding plate 44 is spaced from the adjacent filter mesh 55 to avoid interference with the filter mesh 55 during the rotation relative to the lower wall 42.

[0050] In an alternative way, in order to further achieve the filtering effect, a filtering part 31 is arranged on the low-pressure side of the air source 3. The gas needs to pass through the filtering part 31 and enter the fan 32.

[0051] In another alternative solution, the lower ventilation part 2 further includes a dust collection cavity 53. The ventilation opening 43 of the lower ventilation part 2 is communicated with the filter cavity 52 through the dust collection cavity 53. The ventilation opening 43 is located at the top of the dust collection cavity 53 (that is, the upper wall 41 of the housing 4). Specifically, the dust collection cavity 53 is defined between the upper wall 41 of the lower ventilation part 2 and the adjacent filter mesh 55 in the vertical direction. In the vertical direction, the air passage cavity 51, the filter cavity 52, and the dust collection cavity 53 are arranged in sequence from bottom to top. This is different from the arrangement mode of each cavity in the upper ventilation part 1. In the upper ventilation part 1, the air guiding structure, the filter cavity 52, and the air passage cavity 51 are arranged in sequence from bottom to top in the vertical direction.

[0052] A dust collection plate is arranged in the dust collection cavity 53 in the lower ventilation part 2. The dust collection plate includes at least one dust falling area 54. The dust falling area 54 is located below the ventilation opening 43 in the vertical direction. Since the lower ventilation part 2 is arranged on the lower side of the door body, dust or impurities can fall into the dust falling area 54 under the action of gravity through the ventilation opening 43. The projection range formed by projecting the dust falling area 54 in the vertical direction is smaller than the projection range formed by projecting the dust collection cavity 53. Thus, the filter cavity 52 and the ventilation opening 43 can communicate through the space between the dust falling area 54 and the dust collection cavity 53. By arranging the dust falling area 54, large-particle dust is prevented from falling into the filter cavity 52.

[0053] The top of the dust collection cavity 53 (the upper wall 41 of the second ventilation part 2) has an opening area 45. The ventilation opening 43 is located in the opening area 45. The projection formed by projecting the opening area 45 in the vertical direction is within the projection range formed by projecting the dust falling area 54, so as to prevent the dust in the ventilation opening 43 from directly entering the filter cavity 52 without passing through the dust falling area 54, resulting in filter blockage.

[0054] A plurality of recesses 541 and protrusions 542 are arranged at intervals in the dust collection chamber 53. The recesses 541 and the protrusions 542 are connected to form a wavy structure or a serrated structure, and the recesses 541 serve as the dust falling areas 54. In this way, the depth of the dust falling areas 54 can be reduced, and the volume of the dust falling areas 54 can be ensured to remain unchanged by increasing the number of the dust falling areas 54. When dust or impurities fall onto the protrusions 542, they can slide into the 541.

[0055] The vertical distance between the highest point of the protrusion 542 and the top of the dust collection chamber 53 is between 10 cm and 15 cm. In this way, the wind speed in the dust falling area 54 can be reduced, and the dust particles in the dust falling area 54 can be prevented from flying.

[0056] By adopting the technical solution in the present application, the air curtain system can form a relatively closed air flow cycle. Specifically, when the air blown out from the air vent 43 of a ventilation part forms an air curtain, it will also be affected by external air currents or other indoor factors and diffuse or shift. However, since the air vent 43 of another ventilation part sucks air, these diffused or shifted air can be timely sucked in and sent back to the air supply system for treatment and reuse. In this way, the dependence on and waste of fresh external air are reduced, and at the same time, the energy consumed by the air supply equipment to maintain the air curtain is also reduced, and the blocking effect of the air curtain formed by the air curtain system is made more stable and reliable.

[0057] In this article, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art of this technology, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. An air curtain system, characterized in that, The air curtain system can be switched between a first operating condition and a second operating condition; The air curtain system includes an upper ventilation part (1), a lower ventilation part (2), a positive pressure output end, a negative pressure suction end, and an air source (3). The positive pressure output end and the negative pressure suction end are both connected to the outside. The air source (3) has an air outlet (33) and an air suction port (34). The air outlet (33) is connected to the positive pressure output end, and the air suction port (34) is connected to the negative pressure suction end; In the first operating condition, the upper ventilation part (1) serves as the positive pressure output end, and the lower ventilation part (2) serves as the negative pressure suction end; In the second operating condition, the lower ventilation part (2) serves as the positive pressure output end, and the upper ventilation part (1) serves as the negative pressure suction end.

2. The air curtain system according to claim 1, characterized in that, Both the upper ventilation part (1) and the lower ventilation part (2) are provided with a plurality of ventilation openings (43). The ventilation openings (43) located in the upper ventilation part (1) and the ventilation openings (43) located in the lower ventilation part (2) are arranged opposite to each other along a set direction.

3. The air curtain system according to claim 2, characterized in that, At least one of the upper ventilation part (1) and the lower ventilation part (2) is provided with a wind guiding structure. The wind guiding structure includes a plurality of wind guiding plates (44). The plurality of wind guiding plates (44) can rotate relative to the corresponding ventilation part, and the ventilation opening (43) is defined between two adjacent wind guiding plates (44).

4. The air curtain system according to claim 2, characterized in that Both the upper ventilation part (1) and the lower ventilation part (2) include an air flow cavity (51) and a filtering cavity (52). A filtering element is arranged in the filtering cavity (52). The filtering cavity (52) is connected to the air source (3) through the air flow cavity (51) and is connected to the outside through the ventilation opening (43).

5. The air curtain system according to claim 4, characterized in that, A heat exchange element (56) is further arranged in the air flow cavity (51). The heat exchange element (56) has a refrigeration working position and a heating working position to exchange heat with the gas flowing through the air flow cavity (51) to increase or decrease the temperature of the gas; In the first operating condition, the heat exchange element (56) in the upper ventilation part (1) is in the refrigeration working position; In the second operating condition, the heat exchange element (56) in the lower ventilation part (2) is in the heating working position.

6. The air curtain system according to claim 4, characterized in that, The upper ventilation part (1) and the lower ventilation part (2) are vertically distributed up and down, and the lower ventilation part (2) is arranged below the upper ventilation part (1); The lower ventilation part (2) further includes a dust collection cavity (53). The ventilation opening (43) is located at the top of the dust collection cavity (53); A dust collection plate is arranged in the dust collection cavity (53). The dust collection plate forms at least one dust falling area (54). The dust falling area (54) is vertically located below the ventilation opening (43); The projection range formed by vertically projecting the dust falling area (54) is smaller than the projection range formed by projecting the dust collection cavity (53); 7. The air curtain system according to claim 6, wherein The top of the dust collection cavity (53) has an opening area (45). The ventilation opening (43) is located in the opening area (45); The projection range formed by vertically projecting the opening area (45) is within the projection range formed by projecting the dust collection plate.

8. The air curtain system according to claim 7, characterized in that, The dust collection plate has a plurality of recesses (541) and protrusions (542) arranged at intervals. The recesses (541) and the protrusions (542) are connected to form a wavy structure or a serrated structure, and the recesses (541) serve as the dust falling area (54).

9. The air curtain system according to claim 8, wherein The vertical distance between the highest point of the protrusion (542) and the top of the dust collection chamber (53) is between 10 cm and 15 cm.

10. The air curtain system according to any one of claims 1-9, characterized in that, It includes a first channel (71) and a second channel (72). The first channel (71) is used to connect the air outlet (33) and the upper ventilation part (1), and the second channel (72) is used to connect the air suction port (34) and the lower ventilation part (2); It further includes a third channel (73). The third channel (73) is used to connect the first channel (71) and the second channel (72). The position where the third channel (73) is connected to the first channel (71) is defined as the first connection position (81), and the position where it is connected to the second channel (72) is defined as the second connection position (82); It further includes a fourth channel (74). One end of the fourth channel (74) is connected to the first channel (71), and the other end is connected to the air suction port (34). The position where the fourth channel (74) is connected to the first channel (71) is defined as the third connection position (83), and the third connection position (83) is located between the first connection position (81) and the upper ventilation part (1); A fourth valve (94) is provided in the first channel (71), and the fourth valve (94) is located between the first connection position (81) and the third connection position (83); A second valve (92) is provided in the second channel (72), and the second valve (92) is located between the air suction port (34) and the second connection position (82); A third valve (93) is provided in the third channel (73); A first valve (91) is provided in the fourth channel (74); Each valve has an open position and a closed position: In the first working condition, the first valve (91) and the third valve (93) are in the closed position, and the second valve (92) and the fourth valve (94) are in the open position; In the second working condition, the first valve (91) and the third valve (93) are in the open position, and the second valve (92) and the fourth valve (94) are in the closed position.

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