Air curtain machine and air curtain system

Abstract

The utility model provides an air curtain machine and an air curtain system, the air curtain machine comprises an air suction pipeline, a fan, an air bellow and an air outlet pipeline, the air bellow is configured to be installed indoors and located above a door, and the fan is configured to be installed outdoors; the air suction pipeline is provided with an air suction port and an air outlet, the air suction port of the air suction pipeline is arranged indoors so as to suck indoor air, and the air outlet of the air suction pipeline is arranged outdoors so as to be communicated with an air inlet of the fan; the air outlet pipeline is provided with an air inlet and an air outlet, the air inlet of the air outlet pipeline is communicated with the air outlet of the fan, and the air outlet of the air outlet pipeline is communicated with the air inlet of the air bellow. The air curtain machine can effectively reduce fluctuation of indoor temperature and humidity in the using process of the air curtain machine.

Description

Technical Field

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

[0002] An air curtain machine is a kind of air purification equipment that forms a powerful air flow driven by a high-speed motor driving a cross-flow or centrifugal air wheel to form an "invisible curtain". The air curtain machine is also called an air curtain, an air curtain machine, an air wind curtain machine, an air damper or an air door. The air curtain machine can divide the indoor and outdoor into two independent temperature zones to create a comfortable indoor environment, maintain the effect of indoor air conditioning and purify the indoor air, save electric energy, and make the air circulate, and can effectively isolate dust, smoke, odor, insects and microorganisms, etc.

[0003] At present, the traditional air curtain machines on the market generally include an air box installed on the top of a large door and a fan connected to the air box. The existing air curtain machines are prone to cause fluctuations in the surrounding temperature or humidity during the operation of the equipment or the opening of the door.

[0004] It should be noted that the information disclosed in the background art part of this utility model is only intended to deepen the understanding of the general background art of this utility model, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an air curtain machine and an air curtain system, which can effectively reduce the fluctuations of indoor temperature and humidity during the use of the air curtain machine.

[0006] To achieve the above purpose, the utility model provides an air curtain machine, which includes an air suction pipe, a fan, an air box and an air outlet pipe. The air box is configured to be installed indoors and above the door, and the fan is configured to be installed outdoors; the air suction pipe has an air suction port and an air outlet, the air suction port of the air suction pipe is configured to be arranged indoors to suck indoor air, and the air outlet of the air suction pipe is configured to be arranged outdoors to communicate with the air inlet of the fan; the air outlet pipe has an air inlet and an air outlet, the air inlet of the air outlet pipe is communicated with the air outlet of the fan, and the air outlet of the air outlet pipe is communicated with the air inlet of the air box.

[0007] Optionally, the fan has two air inlets, and each air inlet of the fan is communicated with an air suction pipe.

[0008] Optionally, the two air inlets of the fan are respectively arranged on both sides of the fan.

[0009] Optionally, the distance between the air suction ports of the two air suction pipes communicated with the two air inlets of the same fan is greater than 1 m.

[0010] Optionally, the diameter of the air inlet of the air suction pipe is greater than or equal to 60 mm and less than or equal to 100 mm.

[0011] Optionally, the distance between the air inlet of the air suction pipe and the door is greater than 2 m.

[0012] Optionally, the number of the air blowers is at least two, the air box includes at least two air inlets, and each air blower is communicated with the air box through an air outlet pipe.

[0013] Optionally, the air suction pipe and / or the air outlet pipe is a heat-insulating pipe.

[0014] Optionally, the air curtain machine further includes a diffuser, and the diffuser is communicated with the air outlet of the air box.

[0015] Optionally, the length of the diffuser is equal to the width of the door, and the width of the air outlet of the diffuser is greater than or equal to 5 cm and less than or equal to 8 cm.

[0016] To achieve the above object, the present utility model further provides an air curtain system, which is characterized in that the air curtain system includes a detection module, a controller, and the air curtain machine according to any one of the above, the detection module and the air blower are both communicatively connected to the controller, the detection module is configured to obtain the opening and closing state information of the door and transmit it to the controller, and the controller is configured to control the air blower to start or stop according to the opening and closing state information of the door.

[0017] Compared with the prior art, the air curtain machine and the air curtain system provided by the present utility model have the following beneficial effects:

[0018] The air intake pipe, fan, air box and air outlet pipe provided by the present utility model. The air box is configured to be installed indoors and above the door, and the fan is configured to be installed outdoors; the air intake pipe has an air intake and an air outlet. The air intake of the air intake pipe is configured to be arranged indoors to suck indoor air, and the air outlet of the air intake pipe is configured to be arranged outdoors to communicate with the air inlet of the fan; the air outlet pipe has an air inlet and an air outlet. The air inlet of the air outlet pipe communicates with the air outlet of the fan, and the air outlet of the air outlet pipe communicates with the air inlet of the air box. Thus, by setting the air intake of the air intake pipe indoors, the present utility model can suck the gas with constant temperature and humidity indoors through the air intake pipe as the air source of the air curtain machine, thereby effectively reducing the fluctuations of indoor temperature and humidity during the use of the air curtain machine, and further effectively solving the temperature and humidity loss caused by turning on the air curtain machine in high temperature and high humidity conditions, ensuring that the process equipment in high temperature and high humidity environment can operate safely and reliably. In addition, by installing the fan outdoors, the present utility model can effectively prevent the humid air indoors from entering the fan, which may damage the fan or cause the risk of electric leakage of the fan, thus ensuring the safe and reliable operation of the air curtain machine.

[0019] Since the air curtain system provided by the present utility model includes the air curtain machine provided by the present utility model, the air curtain system provided by the present utility model at least has all the beneficial effects of the air curtain machine provided by the present utility model. For specific details, reference can be made to the relevant descriptions of the beneficial effects of the air curtain machine provided by the present utility model in the above text, and no further elaboration will be made here. In addition, since the air curtain system provided by the present utility model can control the start and stop of the fan according to the door opening and closing state information by a controller (when the door is in the closed state, the controller will control the fan to be in the closed state; when the door is in the open state, the controller will control the fan to be in the starting state), the door opening signal can be used as the fan starting condition (that is, the fan starts only when the door is opened). Thus, not only can it ensure that when the door is opened, the air curtain formed by the air curtain machine can effectively isolate and reduce the impact of the external environment on the indoor environment, but also it can avoid the fan still being in the open state when the door is closed, thereby saving electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the air curtain machine provided by an embodiment of the present utility model;

[0021] Figure 2 It is a schematic diagram of the distribution of the air intakes in the air curtain machine provided by an embodiment of the present utility model;

[0022] Figure 3 It is a schematic block diagram of the air curtain system provided by an embodiment of the present utility model.

[0023] Among them, the reference numerals are explained as follows:

[0024] Suction pipeline - 110; suction port - 111; air outlet - 112;

[0025] Fan - 120; air inlet - 121; exhaust port - 122;

[0026] Air box - 130; air inlet - 131; exhaust port - 132;

[0027] Air outlet pipeline - 140; air inlet - 141; air outlet - 142;

[0028] Diffuser - 150; exhaust port - 151;

[0029] Door - 200;

[0030] Indoor - 310;

[0031] Outdoor - 320;

[0032] Detection module - 400; controller - 500. Detailed implementation manners

[0033] The following further elaborates on the air curtain machine and the air curtain system proposed by the present utility model in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the accompanying drawings are in a very simplified form and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the embodiments of the present utility model. In order to make the purpose, features, and advantages of the present utility model more obvious and understandable, please refer to the accompanying drawings. It should be noted that the structures, scales, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present utility model. Any modification of the structure, change in the proportional relationship, or adjustment of the size, in the case of being the same or similar to the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed by the present utility model. The specific design features of the present utility model disclosed herein, such as specific dimensions, directions, positions, and shapes, will be partially determined by the specific application and usage environment. Also, in the embodiments described below, sometimes the same reference numerals are used between different drawings to represent the same part or parts with the same functions, and the repeated description thereof is omitted. In this specification, similar reference numerals and letters are used to represent similar items. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings. Additionally, if the methods described herein include a series of steps, and the order of these steps presented herein is not necessarily the only order in which these steps can be executed, and some of the described steps can be omitted and / or some other steps not described herein can be added to the method.

[0034] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, it cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Also, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element. The singular forms "a", "an" and "the" include plural objects, the term "or" is generally used in the sense of including "and / or", the term "several" is generally used in the sense of including "at least one", the term "at least two" is generally used in the sense of including "two or more", and the term "a plurality of" is generally used in the sense of including "at least two".

[0035] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In the description of the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected with", "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. Additionally, in the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the top", and "on the upper surface" of the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the bottom", and "on the lower surface" of the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0036] For the convenience of understanding, before introducing the present utility model, a brief description of the research background of the present utility model is given first. In the sterilization industry, an indoor environment with preheated high temperature and high humidity is required, and generally an explosion-proof workshop design is adopted. If the fan is placed indoors, moisture is likely to enter the base body, causing equipment damage or posing a risk of electric leakage.

[0037] Based on this, the core idea of the present utility model is to provide an air curtain machine and an air curtain system, which can not only effectively reduce the fluctuations of indoor temperature and humidity, but also avoid moisture from entering the fan.

[0038] To achieve the above idea, the present utility model provides an air curtain machine. Please refer to Figure 1 and Figure 2 , wherein, Figure 1 is the overall structural schematic diagram of the air curtain machine provided by an embodiment of the present utility model; Figure 2 is the distribution schematic diagram of the air suction port 111 in the air curtain machine provided by an embodiment of the present utility model. AsFigure 1 and Figure 2 As shown in Figure 2 , the air curtain machine provided by the present utility model includes an air suction pipe 110, a fan 120, an air box 130, and an air outlet pipe 140. The air box 130 is configured to be installed indoors 310 and above the door 200, and the fan 120 is configured to be installed outdoors 320. The air suction pipe 110 has an air suction port 111 and an air outlet port 112. The air suction port 111 of the air suction pipe 110 is configured to be arranged indoors 310 to suck the indoor air 310, and the air outlet port 112 of the air suction pipe 110 is configured to be arranged outdoors 320 to communicate with the air inlet 121 of the fan 120. The air outlet pipe 140 has an air inlet 141 and an air outlet 142. The air inlet 141 of the air outlet pipe 140 is communicated with the air outlet 122 of the fan 120, and the air outlet 142 of the air outlet pipe 140 is communicated with the air inlet 131 of the air box 130.

[0039] Thus, by setting the air suction port 111 of the air suction pipe 110 indoors 310, the present utility model can suck the gas with constant temperature and humidity indoors 310 through the air suction pipe as the air source of the air curtain machine, thereby effectively reducing the fluctuations of the temperature and humidity indoors 310 during the use of the air curtain machine, and further effectively solving the loss of temperature and humidity caused by turning on the air curtain machine under high temperature and high humidity conditions, ensuring that the process equipment in the high temperature and high humidity environment can operate safely and reliably. In addition, by installing the fan 120 outdoors 320, the present utility model can effectively prevent the humid air indoors 310 from entering the fan 120, causing damage to the fan 120 or posing a risk of electric leakage to the fan 120, thereby ensuring that the air curtain machine can operate safely and reliably.

[0040] It should be noted that, as can be understood by those skilled in the art, the air curtain machine will only be turned on when the door 200 is opened. When the door 200 is opened, by turning on the air curtain machine, an air curtain can be formed, thereby isolating and reducing the impact of the external environment on the indoor environment.

[0041] Further, the fan 120 is an explosion-proof fan. Thus, by using an explosion-proof fan as the fan 120 in the air curtain machine provided by the present utility model, the service life of the air curtain machine provided by the present utility model can be effectively improved.

[0042] In some exemplary embodiments, the air suction pipe 110 is a heat-insulating pipe. Thus, by using a heat-insulating pipe to suck the gas with constant temperature and humidity indoors 310 and transport it to the fan 120, the loss of temperature and humidity during the gas transportation process can be effectively reduced, thereby further reducing the fluctuations of the temperature and humidity indoors 310 during the use of the air curtain machine, and further better solving the loss of temperature and humidity caused by turning on the air curtain machine under high temperature and high humidity conditions.

[0043] In some exemplary embodiments, the air outlet duct 140 is a heat-insulating duct. Thus, by using a heat-insulating duct to convey the high-pressure air flow formed by the fan 120 to the air box 130, the loss of temperature and humidity during the conveyance of the high-pressure air flow can be effectively reduced, thereby further reducing the fluctuations in the temperature and humidity in the room 310 during the use of the air curtain machine, and further better solving the loss of temperature and humidity caused by turning on the air curtain machine under high temperature and high humidity conditions.

[0044] Please continue to refer to Figure 1 , as Figure 1 shown, in some exemplary embodiments, the fan 120 has two air inlets 121, and each of the air inlets 121 of the fan 120 is connected to one of the suction ducts 110. Thus, by providing two air inlets 121 on the fan 120, and each of the air inlets 121 being connected to one of the suction ducts 110, the flow rate of the gas flowing into the fan 120 can be increased, thereby facilitating the fan 120 to form a more pressurized air flow, and further enabling the finally formed air curtain to be more stable, which helps to improve the isolation effect of the air curtain.

[0045] Please continue to refer to Figure 1 , as Figure 1 shown, in some exemplary embodiments, the two air inlets 121 of the fan 120 are respectively arranged on both sides of the fan 120. Thus, by arranging the two air inlets 121 of the fan 120 to be respectively on both sides of the fan 120, the air flow inside the fan 120 can be relatively balanced, thereby helping to further improve the stability of the finally formed air curtain and further improving the isolation effect of the air curtain.

[0046] In some exemplary embodiments, the distance between the suction ports 111 of the two suction ducts 110 connected to the two air inlets 121 of the same fan 120 is greater than 1 m. Thus, by setting the distance between the suction ports 111 of the two suction ducts 110 connected to the two air inlets 121 of the same fan 120 to be greater than 1 m, it can be ensured that the gas flowing into the fan 120 comes from different areas of the room 310, thereby ensuring that the temperature and humidity of the gas flowing into the fan 120 are closer to the temperature and humidity of the gas in the room 310, and further reducing the fluctuations in the temperature and humidity in the room 310 during the use of the air curtain machine.

[0047] In some exemplary embodiments, the diameter of the air suction port 111 of the air suction pipe 110 is greater than or equal to 60 mm and less than or equal to 100 mm. Thus, by setting the diameter of the air suction port 111 of the air suction pipe 110 to be greater than or equal to 60 mm and less than or equal to 100 mm, it can be effectively ensured that the flow rate of the gas sucked by the air suction pipe 110 from the room 310 is neither too low nor too high. Thereby, it can not only effectively ensure the stability of the formed air curtain, but also help to reduce the fluctuations of the temperature and humidity in the room 310 during the use of the air curtain machine.

[0048] In some exemplary embodiments, the distance between the air suction port 111 of the air suction pipe 110 and the door 200 is greater than 2 m. Thus, by setting the distance between the air suction port 111 of the air suction pipe 110 and the door 200 to be greater than 2 m, it can be ensured that the air suction port 111 of the air suction pipe 110 is set far away from the door 200. Thereby, it can be effectively ensured that the temperature and humidity of the gas flowing into the fan 120 are closer to the temperature and humidity of the gas in the room 310, and further, the fluctuations of the temperature and humidity in the room 310 during the use of the air curtain machine can be reduced.

[0049] Please continue to refer to Figure 1 , as Figure 1 shown, in some exemplary embodiments, the number of the fans 120 is at least two, the air box 130 includes at least two air inlet ports 131, and each fan 120 is connected to the air box 130 through an air outlet pipe 140. Thus, by using multiple fans 120 for driving, it can help to form an air flow with greater pressure, and further help the finally formed air curtain to directly blow to the lowest part of the door 200, thereby further improving the isolation effect of the air curtain. It should be noted that although Figure 1 the air curtain machine including two fans 120 is taken as an example for illustration, as can be understood by those skilled in the art, this does not constitute a limitation to the present invention. In some other embodiments, the air curtain machine may further include three fans 120, four fans 120 or more fans 120. It should also be noted that, as can be understood by those skilled in the art, the air inlet ports 131 on the air box 130 are arranged in one-to-one correspondence with the fans 120, and each intake fan 120 is respectively connected to the air inlet port 131 on the air box 130 through an air outlet pipe 140 in one-to-one correspondence.

[0050] Please continue to refer to Figure 1 , as Figure 1As shown, in some exemplary embodiments, the at least two air inlets 131 of the bellow 130 are spaced apart along the length direction of the bellow 130. Thus, by arranging the multiple air inlets 131 on the bellow 130 to be spaced apart along the length direction of the bellow 130, the high-pressure air flow flowing into the bellow 130 can be made more balanced, which can further contribute to improving the stability of the finally formed air curtain and further enhancing the isolation effect of the air curtain.

[0051] In some exemplary embodiments, the air curtain machine provided by the present utility model further includes a diffuser 150, and the diffuser 150 is communicated with the air outlet 132 of the bellow 130. Thus, by providing the diffuser 150 communicated with the air outlet 132 of the bellow 130, the high-pressure air flow formed by the fan 120 can finally be discharged in multiple directions, so that the air flow distribution of the finally formed air curtain can be made more uniform, which can further contribute to improving the stability of the finally formed air curtain and further enhancing the isolation effect of the air curtain.

[0052] In some exemplary embodiments, the length of the diffuser 150 is equal to the width of the door 200. Thus, by setting the length of the diffuser 150 to be equal to the width of the door 200, it can effectively ensure that the finally formed air curtain can completely cover the area where the door 200 is located, so as to ensure that the air curtain can successfully play the role of isolating and reducing the impact of external factors on the internal environment.

[0053] In some exemplary embodiments, the width of the air outlet 151 of the diffuser 150 is greater than or equal to 5 cm and less than or equal to 8 cm. Thus, by setting the width of the air outlet 151 of the diffuser 150 to be greater than or equal to 5 cm and less than or equal to 8 cm, it can effectively ensure the width (thickness) of the finally formed air curtain, which can further contribute to improving the stability of the finally formed air curtain and further enhancing the isolation effect of the air curtain.

[0054] To achieve the above idea, the present utility model further provides an air curtain system. Please refer to Figure 3 FIG. [FIGURE NUMBER], which is a schematic block diagram of the air curtain system provided by an embodiment of the present utility model. As Figure 3As shown in the figure, the air curtain system provided by the present utility model includes a detection module 400, a controller 500, and the air curtain machine described in any one of the above. The detection module 400 and the blower 120 are both communicatively connected to the controller 500. The detection module 400 is configured to obtain the opening and closing state information of the door 200 and transmit it to the controller 500. The controller 500 is configured to control the startup or shutdown of the blower 120 according to the opening and closing state information of the door 200. Since the air curtain system provided by the present utility model includes the air curtain machine provided by the present utility model, the air curtain system provided by the present utility model has at least all the beneficial effects of the air curtain machine provided by the present utility model. For specific details, reference can be made to the relevant descriptions of the beneficial effects of the air curtain machine provided by the present utility model in the above text, and no further elaboration will be provided here. In addition, since the air curtain system provided by the present utility model can control the startup and shutdown of the blower 120 through the controller 500 according to the opening and closing state information of the door 200 (when the door 200 is in the closed state, the controller 500 will control the blower 120 to be in the closed state; when the door 200 is in the open state, the controller 500 will control the blower 120 to be in the startup state), the opening signal of the door 200 can be used as the startup condition of the blower 120 (that is, the blower 120 starts only when the door 200 is opened). Thus, not only can it ensure that when the door 200 is opened, the air curtain formed by the air curtain machine can effectively isolate and reduce the impact of the external environment on the indoor environment, but also it can avoid the blower 120 still being in the open state when the door 200 is closed, thereby saving electrical energy.

[0055] Specifically, in some embodiments, the detection module 400 can be a sensor for detecting whether the door 200 is opened or closed. The sensor can be installed on the door 200 or above the door 200. In other embodiments, the detection module 400 can be an electric switch installed on the door 200. When the electric switch is turned on, the door 200 is in the open state, and when the electric switch is turned off, the door 200 is in the closed state.

[0056] It should be noted that, as can be understood by those skilled in the art, the present utility model does not limit the specific type of the controller 500. The controller 500 can be, but is not limited to, a PLC (programmable logic controller).

[0057] It should be noted that in the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0058] It should also be noted that the above description is only a description of the preferred embodiments of the present utility model and does not impose any limitation on the scope of the present utility model. Any changes and modifications made by those of ordinary skill in the art of the present utility model based on the above disclosure belong to the protection scope of the present utility model. Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations fall within the scope of the present utility model and its equivalent technologies, the present utility model also intends to include these modifications and variations.

Claims

1. An air curtain machine, characterized in that, It includes an intake duct, a fan, an air box and an outlet duct. The air box is configured to be installed indoors and above the door, and the fan is configured to be installed outdoors; The intake duct has an intake port and an outlet port. The intake port of the intake duct is configured to be arranged indoors to suck indoor air, and the outlet port of the intake duct is configured to be arranged outdoors to communicate with the inlet of the fan; The outlet duct has an inlet and an outlet. The inlet of the outlet duct communicates with the outlet of the fan, and the outlet of the outlet duct communicates with the inlet of the air box.

2. The air curtain machine according to claim 1, wherein, The fan has two inlets, and the two inlets of the fan are arranged on both sides of the fan, and each inlet of the fan communicates with an intake duct.

3. The air curtain machine according to claim 2, wherein, The distance between the intake ports of the two intake ducts communicating with the two inlets of the same fan is greater than 1 m.

4. The air curtain machine according to claim 1, characterized in that, The diameter of the intake port of the intake duct is greater than or equal to 60 mm and less than or equal to 100 mm.

5. The air curtain machine according to claim 1, wherein The distance between the intake port of the intake duct and the door is greater than 2 m.

6. The air curtain machine according to claim 1, characterized in that, The number of the fans is at least two, the air box includes at least two inlets, and each fan is connected to the air box through an outlet duct.

7. The air curtain machine according to claim 1, characterized in that, The intake duct and / or the outlet duct is a heat-insulating duct.

8. The air curtain machine according to claim 1, characterized in that, It further includes a diffuser, and the diffuser communicates with the outlet of the air box.

9. The air curtain machine according to claim 8, characterized in that, The length of the diffuser is equal to the width of the door, and the width of the outlet of the diffuser is greater than or equal to 5 cm and less than or equal to 8 cm.

10. An air curtain system, characterized in that, It includes a detection module, a controller and an air curtain machine according to any one of claims 1 to 9. The detection module and the fan are both communicatively connected to the controller. The detection module is configured to obtain the opening and closing state information of the door and transmit it to the controller, and the controller is configured to control the fan to start or stop according to the opening and closing state information of the door.

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