Airflow Control System

Abstract

An airflow control system is used to control the airflow direction in a target space including a top and a bottom. The airflow guiding component of the airflow control system includes an air outlet device and an air suction device, the air outlet device includes an air outlet located at the top of the target space, and the air suction device includes an air suction port located at the bottom of the target space. The blown airflow blown out by the air outlet device and the suction force of the air suction device cooperate to generate an induced airflow from top to bottom. The induced airflow can inhibit the upward diffusion of pollutants present in the target space. The airflow control system can inhibit the upward diffusion of pollutants, thereby avoiding the risk of cross infection.

Description

Technical Field

[0001] The present application relates to the field of indoor air conditioning, and in particular to an airflow control system for controlling the airflow in a target space within a certain range. Background Art

[0002] An air purification system is a common indoor air conditioning system, which is used to circulate air in a closed or semi-closed indoor space to purify the air in the indoor space.

[0003] Common air purifiers are usually placed on the ground, blowing air from the air outlet located on the upper or top of the air purifier, sucking air from the side close to the ground, and purifying the indoor air by continuously circulating the indoor air. However, such blowing and sucking methods will stir up all the indoor air, and pollutants will spread throughout the room. Although the fresh air system in commercial office buildings has many air outlets that can be distributed in different locations, there are usually only one or two centralized return air outlets on each floor. The air containing pollutants will pass through different workstations before finally reaching the centralized return air outlet. For pathogens of respiratory infectious diseases that are transmitted in the form of droplets and aerosols (such as influenza viruses, new coronaviruses, etc.), the anti-pollution effect of the above-mentioned air purification system is limited. Although the air purification system can reduce the concentration of pathogens in the indoor space through air circulation, it cannot completely prevent the spread of pathogens in the indoor space. Even the airflow blown into the indoor space by the air purification system will spread the pathogens, increasing the risk of disease transmission.

[0004] Therefore, there is a need for a system with an improved structure, which can control the airflow in the indoor space and prevent pollutants such as dust and pathogens existing in a local area of ​​the space from spreading to the surroundings, thereby isolating the pollutants. Summary of the invention

[0005] The present application is made to solve the problems existing in the above-mentioned prior art, and its purpose is to provide an airflow control system with an improved structure, which can control the flow of airflow in the indoor space, inhibit the diffusion of pollutants present therein, and then isolate the pollutants in a local area and discharge them out of the indoor space.

[0006] The above-mentioned purpose of the present application is achieved by an airflow control system, which is used to control the airflow direction in a target space including a top and a bottom. Wherein, the airflow control system includes at least one airflow guiding component, and the airflow guiding component includes: at least one air outlet device, the air outlet device includes an air outlet, the air outlet is located at the top of the target space, and the air outlet device blows and delivers airflow to the target space via the air outlet; and at least one air suction device, the air suction device includes an air suction port, the air suction port is located at the bottom of the target space, and the air suction device sucks air from the target space via the air suction port. Wherein, the blowing airflow blown out by the at least one air outlet device and the suction force of the at least one air suction device cooperate to generate an induced airflow from top to bottom, wherein the pollutants in the target space are located on the flow path of the induced airflow, thereby, the induced airflow can inhibit the pollutants existing in the target space from diffusing upward.

[0007] Through the airflow control system of the above structure, the air outlet of the air outlet device is located at the top of the target space, so that the blowing airflow from the air outlet is roughly from top to bottom, and the air suction port of the suction device is arranged at the bottom of the target space. The blowing airflow and the suction force formed by the suction device cooperate with each other to form an induced airflow from top to bottom. Under the action of the induced airflow, the upward diffusion of pollutants can be suppressed, and the pollutants can be sucked downward to the suction device, thereby avoiding the risk of cross infection in closed or semi-closed spaces.

[0008] Preferably, the wind speed of the blown air flow is less than the wind speed of the suction air flow formed by the suction device. The lower flow rate of the blown air flow makes the personnel in the target space have no obvious blowing feeling, thereby improving the comfort. Optionally, the blown air flow is set to have a wind speed of no more than 0.6 m / s at the air outlet. Such a wind speed setting can effectively reduce the vortex formed near the boundary of the blown air flow and the induced air flow, further helping to inhibit the diffusion of pollutants.

[0009] Preferably, a central axis of at least one air suction device and a central axis of at least one air outlet device are staggered with each other.

[0010] The airflow guiding assembly may include any suitable number of air outlet devices and any suitable number of air suction devices as required.

[0011] For example, in one example, the airflow guiding assembly includes an air outlet device and an air suction device. Optionally, the central axes of the air suction device and the air outlet device are staggered or overlapped with each other.

[0012] Alternatively, the airflow guiding assembly may include two air outlet devices and one air suction device, wherein there is an air outlet device on each side of the air suction device.

[0013] Alternatively, the airflow guiding assembly may include four air outlet devices and one air suction device, wherein the four air outlet devices are arranged on at least two sides of the air suction device.

[0014] Alternatively, the airflow guiding assembly may include an air outlet device and two air suction devices, wherein there is an air suction device on each side of the air outlet device.

[0015] Alternatively, the airflow guiding assembly may include one air outlet device and four air suction devices, wherein the four air suction devices are arranged on at least two sides of the air outlet device.

[0016] Generally speaking, there are obstacles in the target space, for example, a desk is placed in the target space used as an office. The air outlet device is located outside the projection range of the obstacle on the top, and the air suction device is located within the projection range of the obstacle on the bottom. In this way, the airflow from the air outlet device will not blow onto the obstacle, thereby reducing the vortex generated by the airflow, which further helps to reduce the spread of pollutants.

[0017] Preferably, the air outlet of the air outlet device blows the air flow substantially vertically.

[0018] In a preferred structure, the air flow control system further comprises an exhaust device, which discharges the air flow containing pollutants sucked by the suction device into the external environment.

[0019] Preferably, the air flow control system further comprises an air processing device, which is arranged in the target space and is used to process the air flow drawn from the target space.

[0020] The air treatment device may include a purification component for purifying the airflow. The purification component may include a filter component, or the purification component itself is a filter component.

[0021] Preferably, the suction device is provided with an active suction component, which helps to achieve a required and appropriate suction wind speed.

[0022] The airflow control system of a specific embodiment of the present invention forms an induced airflow that moves approximately from top to bottom in the target space through the synergistic effect of the airflow blown by the air outlet device and the suction force of the air suction device. The induced airflow, on its path toward the air suction device, drives the pollutants on its flow path to flow approximately downward, thereby suppressing the tendency of pollutants to diffuse upward, and allowing the pollutants to be sucked away by the air suction device as quickly as possible, thereby reducing further pollution caused by the diffusion of pollutants in the target space. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings show non-limiting preferred implementation structures of the present application, and the features and advantages of the present application can be more clearly seen in conjunction with the accompanying drawings.

[0024] Figure 1 A schematic diagram showing an exemplary airflow control system of the present invention installed in a target space.

[0025] Figure 2 Shows Figure 1 Schematic diagram of the airflow pattern formed by the airflow control system in FIG.

[0026] Figure 3 Shows Figure 1 A schematic diagram of a preferred structure of an airflow control system.

[0027] Figure 4 A first example of the arrangement of the air outlet device and the air suction device is shown.

[0028] Figure 5 A second example of the arrangement of the air outlet device and the air suction device is shown.

[0029] Figure 6 A third example of the arrangement of the air outlet device and the air suction device is shown.

[0030] Figure 7 A fourth example of the arrangement of the air outlet device and the air suction device is shown.

[0031] Figure 8 A fifth example of the arrangement of the air outlet device and the air suction device is shown.

[0032] Fig. 9 A sixth example of the arrangement of the air outlet device and the air suction device is shown.

[0033] Fig.10 The CO 2 concentration distribution diagram (simulation diagram) in the target space obtained in Experiment 1 is shown.

[0034] Fig.11 Shows Fig.10 A schematic diagram of the airflow pattern obtained in Experiment 1 is shown.

[0035] Fig.12 The CO2 concentration distribution diagram in the target space obtained in Experiment 2 (simulated diagram) is shown.

[0036] Fig.13 The CO 2 concentration distribution diagram (simulation diagram) in the target space obtained in Experiment 3 is shown.

[0037] Fig.14 The CO 2 concentration distribution diagram (simulation diagram) in the target space obtained in Experiment 4 is shown.

[0038] (Explanation of symbols)

[0039] 1 Target Space

[0040] 2 Office Staff

[0041] 3. Desk

[0042] 10 Airflow Control System

[0043] 11 Air outlet device

[0044] 12 Air suction device

[0045] 13 Air outlet

[0046] 14 Return air duct

[0047] 15 Exhaust device

[0048] 16 Active suction components

[0049] 17 Filter components

[0050] 21 Blow out airflow

[0051] 22 Suction airflow

[0052] 23 Induced airflow DETAILED DESCRIPTION

[0053] To facilitate understanding of the present invention, specific embodiments of the present invention will be described below with reference to the accompanying drawings. However, it should be understood that the drawings only show preferred embodiments of the present invention, which do not constitute a limitation on the scope of the present invention. Those skilled in the art can make various obvious modifications, variations, and equivalent substitutions to the present invention based on the embodiments shown in the drawings, and the technical features in different embodiments can be combined arbitrarily without contradiction, and all of these fall within the scope of protection of the present invention.

[0054] In the following description of the specific implementation of the present invention, "target space" refers to a space where people move around and where obstacles (such as tables, cabinets) are placed. "Top and bottom of the target space" refers to the upper boundary surface of the target space and the lower boundary surface of the target space.

[0055] The “head space” above the target space refers to a space that is located above the target space but is separated from the target space and partially communicated with the target space.

[0056] The “bottom space” below the target space refers to a space that is located below the target space but is separated from the target space and partially communicated with the target space.

[0057] The “wind speed of the blown air flow” refers to the wind speed at the air outlet of the air blowing device.

[0058] The “wind speed of the suction airflow” refers to the wind speed at the suction port of the suction device.

[0059] Conventional air purification systems, such as clean rooms, all have the ceiling at the top of the target space set as an outlet, and all the floors at the bottom of the target space set as return air inlets (perforated floor), so that the actively blown out air flow suppresses the diffusion of pollutants, and the downward air flow leaves the target space through the return air inlet on the floor. The overall clean room system is expensive, complex to install, and has high operating costs. In addition, in a clean room with such a setting, obstacles (such as tables, etc.) usually cannot or need to be reduced to reduce the impact of obstacles on airflow organization.

[0060] The airflow control system of a specific embodiment of the present invention includes an air outlet device with an air outlet set at the top of the target space and an air return device with an air intake set at the bottom of the target space. Through the cooperation of the blown airflow of the air outlet device and the suction of the air intake device, an induced airflow is formed roughly from top to bottom in the target space, thereby suppressing the upward diffusion trend of pollutants on the path where the induced airflow moves downward. In other words, the airflow control system in this specific embodiment of the present invention does not need to set the entire top of the target space as an air outlet, and does not need to set the entire bottom of the target space as a return air outlet, so as to achieve the suppression of the upward diffusion trend of pollutants. Moreover, since the diffusion of pollutants is suppressed by the induced induced airflow, the existence of obstacles in the target space has little effect on the induced airflow, and will not cause the induced airflow to form obvious vortices and backflows, and therefore will not affect the airflow organization of the induced airflow.

[0061] In another specific embodiment, the air flow control system further comprises an exhaust device, which exhausts the polluted air sucked by the return air device to outside the target space to maintain the cleanliness of the air in the target space. In an optional specific embodiment, a filter component is provided in the return air device and / or the air outlet device to purify the return air and / or the air outlet to ensure the cleanliness of the exhaust air and / or the air outlet.

[0062] In another specific embodiment, the air flow control system further includes an air treatment device, and the air containing pollutants sucked in by the return air device is transported to the air treatment device, and a purification component is provided in the air treatment device to achieve purification of pollutants. The purification component includes, for example, a filter component, or the purification component itself is a filter component. The treated air is then sent into the target space through the air outlet device to achieve internal circulation of the air in the space.

[0063] Figure 1 A schematic diagram of an exemplary airflow control system 10 of the present invention installed in a target space 1 is shown.

[0064] The target space 1 is, for example, an indoor office space, which is usually closed or semi-closed and has a relatively large number of people. Furniture such as desks 3 are placed in the target space 1, which constitute obstacles to the flow of air. There are also office workers 2 in the target space 1, who usually sit in front of the desks 3.

[0065] like Figure 1 As shown, an airflow control system 10 is provided in the target space 1, and the airflow control system 10 can control the airflow in the target space 1 to suppress the spread of pollutants (such as dust, pathogens, etc.) in a local area of ​​the target space 1 in the target space 1. The airflow control system 10 includes an air outlet device 11, which is located at the upper part of the target space 1 and includes an air outlet generally formed at the top of the target space 1. For example, the air outlet of the air outlet device 11 can be provided on the ceiling of the target space 1. The air outlet device 11 blows a blown airflow 21 (see FIG. 2 ) to the target space 1 through its air outlet. Figure 2 ), the blown airflow 21 is a substantially vertical airflow from top to bottom. It should be understood that the blown airflow 21 can also have a certain blowing angle, such as tilting toward the staff on one side, but the tilt angle of the blown airflow 21 will not cause the blown airflow 21 to directly act on the staff to avoid forming a vortex.

[0066] The airflow control system 10 further includes a suction device 12, which is located at the lower part of the target space 1 and includes a suction port disposed at the bottom (e.g., on the floor) of the target space 1. The suction device 12 draws air from the target space 1 through its suction port to form a suction airflow 22 (see FIG. Figure 2 ).

[0067] Go to Figure 2 It can be seen that the air outlet device 11 blows the blowout airflow 21 downwardly and vertically, and the suction action of the air suction device 12 forms the suction airflow 22 near it, and the suction airflow 22 makes the airflow including the blowout airflow 21 in the target space 1 flow to the suction port of the air suction device 12. With the help of the suction airflow 22 generated by the air suction device 12, and then cooperated with the blowout airflow 21, an induced airflow 23 is formed in the target space 1, and the induced airflow 23 basically forms a flow path from top to bottom, so as to take away the pollutants in the area where the induced airflow 23 flows, prevent the diffusion of the pollutants, and finally be sucked away by the air suction device 12.

[0068] Preferably, if Figure 2As shown in FIG. 1 , the desk 3 is located in the area where the induced airflow 23 is located, so that the office worker 2 sitting in front of the desk 3 is also in the area of ​​the induced airflow 23, while the blowout airflow 21 and the suction airflow 22 are outside the area of ​​the induced airflow 23, so that the blowout airflow 21 does not directly contact the office worker 2, so that the office worker 2 does not have a significant sense of wind, which improves the comfort of the human body. In addition, the office worker 2 and the desk 3 are located outside the range of the blowout airflow 21, so that the blowout airflow 21 does not cause vortices due to collision and contact with them, which further helps to suppress the diffusion of pollutants in the target space 1.

[0069] Figure 3 A preferred exemplary structure of the airflow control system 10 is shown in FIG. As mentioned above, the airflow control system 10 includes an air outlet device 11 located at the upper part of the target space 1 and an air suction device 12 located at the lower part of the target space 1. Preferably, the airflow control system 10 also includes an air outlet passage 13 connected to the air outlet device 11, and the air outlet passage 13 supplies air to the air outlet device 11. The air outlet passage 13 is formed above the target space 1. For example, an air duct can be arranged above the target space 1, and the air duct is connected to the air outlet device 11 and is fluidly connected to each other. Alternatively, another form of the air outlet passage 13 is a top space separated by a ceiling above the target space 1. At this time, the air outlet device 11 is fluidly connected to the top space. Among them, the top space separated by the ceiling is used as the air outlet passage 13, which can reduce the installation difficulty and cost of the overall system. The air outlet passage does not need to arrange the air duct, and the modification of the ceiling is small. Only a small amount of the ceiling needs to be removed to install the air outlet device, and the installation cost is low.

[0070] Similarly, the airflow control system 10 may also include a return air passage 14 connected to the suction device 12, and the return air passage 14 is formed below the target space 1. One form of the return air passage 14 is an air duct arranged below the target space 1, or it may be a bottom space separated by a floor at the bottom of the target space 1. Among them, the bottom space separated by the floor is used as the return air passage 14, which can reduce the installation difficulty and cost of the overall system. The return air passage does not need to arrange air ducts, and basically does not need to consider the avoidance of the original pipelines and lines in the space under the floor. In addition, the changes to the floor are relatively small, and only a small amount of floor needs to be removed and replaced with a suction device.

[0071] An exhaust device 15 may also be provided in the bottom space to discharge the airflow with pollutants sucked from the target space 1 by the air suction device 12 into the external environment. It should be understood that in another embodiment, the exhaust device 15 may also be provided in the target space or in the top space, and the airflow with pollutants in the return air passage 14 is transported to the exhaust device 15 through the air duct and finally discharged into the external environment.

[0072] In another exemplary embodiment, an airflow channel module (not shown) may be provided between the air outlet device 11 and the air suction device 12. The lower end of the airflow channel is connected to the return air passage 14, and the upper end is connected to the air outlet passage 13. In this way, the airflow sucked by the air suction device 12 is sent back to the air outlet device 11 via the airflow channel module, and is blown into the target space 1 again by the air outlet device 11 to form a blown airflow 21. In order to ensure the quality of the airflow blown out from the air outlet device 11, a filter component 17 may be provided upstream of the air outlet device 11, for example, in the air outlet passage 13, for purifying the air forming the airflow.

[0073] In another exemplary embodiment, an air treatment device is provided between the air outlet device 11 and the air suction device 12. The air treatment device is preferably provided in the return air passage 14, upstream of the exhaust device 15. In this way, the air treatment device can perform treatments such as purification on the airflow sucked from the target space 1 by the return air passage 14, and then discharge the treated airflow into the external environment. Further, the air treatment device may include a purification component for purifying the airflow. For example, the purification component may include the same filter component 17 as described above, or the purification component itself is the filter component 17.

[0074] In an alternative embodiment, the airflow processed by the air treatment device can flow back into the air outlet passage 13 and be blown back into the target space 1 again, thereby realizing the internal circulation of the airflow in the target space 1. In addition, in a further alternative embodiment, at least a part of the air treatment device can be arranged in the target space 1, and the air treatment device is preferably arranged to draw airflow from the lower part of the target space 1, thereby directly purifying the air in the target space 1.

[0075] In another exemplary embodiment, the air suction device 12 may also be provided with an active suction component 16, which may be in the form of a fan schematically shown in the figure, etc. The active suction component 16 can achieve an inhaled airflow with a certain wind speed, which is conducive to the coordinated effect with the outgoing airflow, and effectively forms an induced airflow roughly from top to bottom.

[0076] According to the actual situation and specific needs of the specific target space 1, a group of appropriate number of air outlet devices 11 and appropriate number of air suction devices 12 can be formed to form an airflow guide assembly. Several exemplary arrangements will be described below.

[0077] Figure 4 The first example of the arrangement of the air outlet device 11 and the air suction device 12 is shown in FIG. 1 . In the example, an air outlet device 11 and an air suction device 12 are grouped together to form an air flow guide assembly. Figure 4In the structure shown, the projection of the air outlet device 11 on the bottom of the target space 1 and the air suction device 12 are located on the same side of the desk 3, and the central axis of the air outlet device 11 and the central axis of the air suction device 12 are aligned with each other.

[0078] exist Figure 5 , a second example of the arrangement of the air outlet device 11 and the air suction device 12 is shown. In the figure, a group of air outlet devices 11 and air suction devices 12 are formed, the projection of the air outlet device 11 on the bottom of the target space 1 is located on one side of the desk 3, and the air suction device 12 is located below the desk 3, so that the central axis of the air outlet device 11 and the central axis of the air suction device 12 are staggered.

[0079] exist Figure 6 In the third example of the arrangement shown in , two air outlet devices 11 and one air suction device 12 are included to form an airflow guide assembly. The projections of the two air outlet devices 11 on the bottom of the target space 1 are respectively located on both sides of the desk 3, or in other words, their projections do not fall on the desk 3, and the air suction device 12 is located below the desk 3, so that the central axis of each air outlet device 11 and the central axis of the air suction device 12 are staggered, and the pollutants in the space on both sides of the desk 3 can be processed accordingly.

[0080] exist Figure 7 In the fourth example of the arrangement shown, four air outlet devices 11 and one air suction device 12 are included. The projections of the four air outlet devices 11 on the bottom of the target space 1 are respectively located outside the four sides of the desk 3, or in other words, their projections do not fall on the desk 3, while the air suction device 12 is located below the desk 3. Therefore, in this arrangement, the central axis of the air suction device 12 is staggered with the central axes of the four air outlet devices 11.

[0081] exist Figure 8 In the fifth example of the arrangement shown, an air outlet device 11 and two air suction devices 12 are included. Two desks 3 are arranged in the corresponding target space 1, and the two air suction devices 12 are respectively located below the two desks 3, while the projection of the air outlet device 11 on the bottom of the target space 1 is located between the two desks 3. Therefore, in this arrangement, the central axis of the air outlet device 11 and the central axes of the two air suction devices 12 are staggered with each other. In this example, an embedded air-conditioning terminal device with two-way air outlet can be used as the air outlet device 11. In this way, it can be compatible with the original air conditioning system, further reducing the difficulty of installing the airflow control system.

[0082] exist Fig. 9In the sixth example of the arrangement shown, an air outlet device 11 and four air suction devices 12 are included. Among them, four office desks 3 are arranged in the corresponding target space 1, and the four air suction devices 12 are respectively located below the four office desks 3, and the projection of the air outlet device 11 on the bottom of the target space 1 is located in the gap between the four office desks 3. Therefore, in this arrangement, the central axis of the air outlet device 11 and the central axes of the four air suction devices 12 are staggered with each other. In this example, an embedded air-conditioning terminal device with air outlets on all sides can be used as the air outlet device 11. In this way, it can be compatible with the original air-conditioning system, further reducing the difficulty of installing the airflow control system.

[0083] In the above description of the arrangement of the air outlet device 11 and the air suction device 12, a set of a plurality of air outlet devices 11 and a plurality of air suction devices 12 corresponding thereto and cooperating therewith is defined as an airflow guide assembly. For an airflow control system 10 applied to a specific target space 1, it may include one airflow guide assembly defined in this way, or may include two, three or more such airflow guide assemblies, the specific number of which is determined in the design stage according to factors such as the area of ​​the target space 1, the number of office seats, and the number of office workers.

[0084] The control parameters of various aspects of the airflow control system 10 of the present invention are described below.

[0085] As described above, the suction airflow 22 is formed by the suction action of the suction device 12, and the suction airflow 22 plays a major role in forming the induced airflow 23. In order to effectively form the induced airflow 23, it is preferred that the wind speed of the suction airflow 22 is greater than the wind speed of the blown airflow 21.

[0086] The applicant has determined the relationship between the arrangement mode and size parameters of the air outlet device 11 and the air suction device 12 and the flow parameters of the blowout airflow 21 and the air suction airflow 22 through simulation experiments, so as to guide the design of the airflow control system 10. CO2 is used to simulate pollutants.

[0087] Fig.10 The CO2 concentration distribution diagram in the target space 1 obtained in Experiment 1 is shown. Figure 6The arrangement of the air outlet device 11 and the air suction device 12 shown in the figure is that the projections of the two air outlet devices 11 on the bottom of the target space 1 are respectively located on both sides of the desk 3, while the air suction device 12 is located below the desk 3, and the air suction port of the air suction device 12 is assumed to be a square with a size of 300mm×300mm. In Experiment 1, the wind speed of the blowing airflow 21 of the air outlet device 11 is set to about 0.3m / s, and the wind speed of the suction airflow 22 of the suction device 12 is set to about 2.1m / s. Under the wind speed condition of the suction airflow 22, the airflow pattern formed is as follows: Fig.11 As shown in , it can be seen that the induced airflow 23 can be basically formed from top to bottom, so that the tendency of the gas exhaled by the office worker 2 to diffuse upward is suppressed.

[0088] Further, in Fig.12 In the experiment 2 shown, the size of the suction port of the suction device 12 is 200mm×200mm, the wind speed of the blowing air flow 21 of the air outlet device 11 is set to about 0.5m / s, and the wind speed of the suction air flow 22 is set to 2.9m / s. It can be seen that the induced airflow 23 formed can effectively isolate the gas exhaled by the office worker 2.

[0089] In addition, it can be seen from the above results that, under the same layout of the air outlet and return air devices, increasing the wind speed of the suction airflow 22 can produce an induced airflow with a slightly higher flow velocity. The induced airflow with a slightly higher flow velocity can better suppress the tendency of pollutants to diffuse upward, thereby effectively achieving the isolation of pollutants.

[0090] exist Fig.13 In Experiment 3, the wind speed of the suction airflow 22 is set to 1.9m / s, and the wind speed of the blowing airflow 21 at the air outlet is set to 1m / s. Although it can form an effective induced airflow 23 to prevent the upward diffusion of pollutants, the overall airflow suppression effect is slightly worse than that of Experiments 1 and 2. On the whole, the wind speed of the blowing airflow 21 of the air outlet device 11 at its air outlet is preferably less than or equal to 1m / s, and the induced airflow formed has a better control effect on pollutants and can control pollutants within a smaller range.

[0091] And in Fig.14 In the experiment 4 shown, the wind speed of the suction airflow 22 is set to 0.5m / s, and the wind speed of the blowing airflow 21 at the air outlet is increased to 0.8m / s. At this time, although the induced airflow can be formed to a certain extent to suppress the diffusion of pollutants (CO2 shown in the figure), in a small range, there is a certain intersection between the pollutants generated by two people sitting opposite each other. Therefore, in order to make the induced airflow suppress the diffusion of pollutants to a greater extent, the same method as in experiments 1-3 should be adopted to make the wind speed of the blowing airflow 21 smaller than the wind speed of the suction airflow 22.

[0092] Furthermore, the following method can also be used to reduce energy consumption while maintaining or even improving the induced airflow 23 to suppress the diffusion of pollutants.

[0093] In the case of the same suction area, the number of suction ports is increased, and further, the multiple suction ports can be set away from each other. The total suction area remains unchanged, and multiple suction ports are set. Compared with only one suction port, the area of ​​each of the multiple suction ports is reduced, so that the wind speed at each suction port is appropriately reduced, thereby reducing the total air volume required as a whole, achieving the purpose of reducing energy consumption.

[0094] The air inlet is set in a rectangular, oval or similar long strip shape, and the long side of the long strip shape faces the corresponding position of the projection of the air outlet device 11 at the bottom of the target space 1. Under such an air inlet setting, the long side corresponds to the office worker sitting next to the obstacle, so that the pollutants exhaled by the office worker can be better inhaled.

[0095] For example, experiments (such as Experiment 2) revealed that Figure 6 In the arrangement of the air outlet device 11 and the air suction device 12 shown, the air suction device 12 includes a square air suction port. At this time, the air suction volume required to suppress the pollutants in the corresponding target space 1 is 700m 3 / h.

[0096] In Experiment 5 (not shown), the total air suction area remains unchanged compared to Experiment 2, but two rectangular air suction ports are set apart from each other. In this case, the air suction volume required to suppress the pollutants in the corresponding target space 1 is 520m 3 / h(The air suction volume of each air suction port is 260m 3 The comparison of the experimental data of Experiment 2 and Experiment 7 is shown in Table 1 below:

[0097] Table 1 Summary of return air outlet area, suction air velocity, and return air volume for Experiments 2 and 5

[0098]

Claims

1. An airflow control system for controlling the airflow direction in a target space, wherein the target space includes a top and a bottom, characterized in that: The airflow control system includes at least one airflow guiding component, and the airflow guiding component includes: at least two air outlet devices, each of which includes an air outlet, the air outlet is located at the top of the target space, and the air outlet device blows an airflow toward the target space via the air outlet; at least one air suction device, the air suction device comprising an air suction port, the air suction port being located at the bottom of the target space, the air suction device sucking air from the target space via the air suction port; The number of the air outlet devices is greater than the number of the air suction devices, and the central axis of the air suction device is staggered with the central axis of the air outlet device; Wherein, the wind speed of the blown air flow is less than the wind speed of the suction air flow formed by the suction device; The blowing airflows blown out by the at least two air outlet devices and the suction force of the at least one air suction device cooperate to generate an induced airflow from top to bottom, wherein the pollutants in the target space are located on the flow path of the induced airflow, thereby the induced airflow can inhibit the pollutants present in the target space from diffusing upward.

2. The airflow control system according to claim 1, characterized in that: The airflow guide assembly comprises: Two air outlet devices and one air suction device, wherein there is one air outlet device on each side of the air suction device; or There are four air outlet devices and one air suction device, wherein the four air outlet devices are arranged on at least two sides of the air suction device.

3. The airflow control system according to claim 1 or 2, characterized in that: There is an obstacle in the target space, wherein the air outlet device is located outside the range of the projection of the obstacle on the top, and the air suction device is located within the range of the projection of the obstacle on the bottom.

4. The airflow control system according to claim 1, characterized in that: The air outlet of the air outlet device blows out the air flow substantially vertically.

5. The airflow control system according to claim 1, characterized in that: It also includes an exhaust device, which discharges the air flow containing pollutants sucked by the suction device into the external environment.

6. The airflow control system according to claim 1, characterized in that: It also includes an air processing device, which is arranged in the target space and is used to process the airflow sucked from the target space.

7. The airflow control system according to claim 6, characterized in that: The air treatment device includes a purification component.

8. The airflow control system according to claim 1, characterized in that: The air suction device is provided with an active suction component.

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