Makeup air structure and exhaust cabinet

Abstract

The application discloses a make-up air structure for an exhaust cabinet, an air inlet channel extending along a first direction, the air inlet channel being provided with an air inlet; an adjusting channel extending along a second direction, the adjusting channel having an inlet and an outlet along the second direction, the inlet of the adjusting channel being communicated with the outlet of the air inlet channel; and an air outlet channel, the air outlet channel being provided with an air outlet, the inlet of the air outlet channel being connected with the outlet of the adjusting channel and intersecting with a first plane; the first plane and the side wall of the adjusting channel surrounding an adjusting area, the area of any cross section of the adjusting area in the first direction being greater than the area of the cross section of the outlet of the air inlet channel. The application can make the air speed of the air outlet uniform. The application further provides the exhaust cabinet.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of exhaust fume hoods, and particularly relates to a make-up air structure and an exhaust fume hood. BACKGROUND

[0002] Ventilation equipment can generally be described as equipment for removing waste gas, harmful gas and particulate matter in a working space to the outside of the working space (usually the outdoor). Such equipment has a very wide range of applications in industry and life, for example, a factory producing toxic and harmful or particulate matter gas, a biological and chemical laboratory of a research institution, a kitchen producing cooking fumes, and the like, all of which need ventilation equipment to isolate the toxic and harmful gas and particulate matter in a certain working space from the users to prevent the users from inhaling the toxic and harmful gas and particulate matter, and to remove the toxic and harmful gas and particulate matter to the outside.

[0003] For example, the Chinese patent document with publication number CN109297132A provides a make-up air type exhaust fume hood. A make-up air function column is arranged on the outer back of the outer shell, a side air tank is arranged on the outer side wall of the outer shell, a fresh air inlet is arranged on the top of the make-up air function column, the bottom of the make-up air function column is communicated with the side air tank, and a plurality of fresh air outlets are arranged on the side air tank. In this technical solution, the make-up air system is redesigned compared with the prior art. The fresh air outlets are arranged on the front and inner side of the side air tank. On the one hand, the make-up air system is designed to avoid the ventilation opening in the operation space. The make-up air amount cannot meet the demand of a large amount of exhaust air, and the gas turbulence in the operation space is easy to cause the harmful gas to escape, which threatens human health and makes it difficult to control the experimental environment. On the other hand, the make-up air system is designed to avoid being arranged on the indoor top to directly blow the head and face of the operator. Long-term operation is easy to cause discomfort. At the same time, the fresh air is mixed with a large amount of indoor air, and then is sucked into the exhaust fume hood and discharged to the outdoor, which causes the air conditioning system to have a high operation cost, and the temperature and humidity of other areas in the indoor are difficult to control.

[0004] However, the air outlet wind speed of the existing exhaust fume hood is not uniform. SUMMARY

[0005] The present application aims to solve the problem of non-uniform air outlet wind speed of the exhaust fume hood. The present application provides a make-up air structure, which can reduce the influence of the jet flow on the non-uniform flow field, convert part of the dynamic pressure into static pressure, reduce the speed, and make the air outlet wind speed uniform.

[0006] To solve the above technical problems, the embodiment of the present application discloses a make-up air structure for a fume hood, comprising: an air inlet channel extending along a first direction, wherein an air inlet is arranged on the air inlet channel; an adjustment channel extending along a second direction, wherein along the second direction, the adjustment channel has an inlet and an outlet, and the inlet of the adjustment channel is in communication with the outlet of the air inlet channel; an air outlet channel, wherein an air outlet is arranged on the air outlet channel, the inlet of the air outlet channel is connected with the outlet of the adjustment channel, and the first plane and the side wall of the adjustment channel enclose an adjustment area, wherein the area of any cross section of the adjustment area in the first direction is greater than the area of the cross section of the outlet of the air inlet channel; and one or any combination of the following: a first orifice plate, a second orifice plate and a third orifice plate, wherein the first orifice plate extends along a third direction, is arranged in the adjustment channel, and the first direction, the second direction and the third direction are at a set angle with each other; the second orifice plate extends along the third direction, and the second orifice plate is arranged in the adjustment area; and the third orifice plate is arranged at the air outlet and covers the air outlet.

[0007] By adopting the above technical solution, the influence of the jet flow on the uneven flow field can be reduced, part of the dynamic pressure is converted into static pressure, the speed is reduced, and the air outlet wind speed is uniform.

[0008] According to another specific embodiment of the present application, the first plane, the first orifice plate and the side wall of the adjustment channel enclose the adjustment area.

[0009] According to another specific embodiment of the present application, the first orifice plate and the second orifice plate are respectively perpendicular to the side wall of the adjustment channel.

[0010] According to another specific embodiment of the present application, along the second direction, the projection of the first orifice plate covers the projection of the inlet of the adjustment channel.

[0011] According to another specific embodiment of the present application, the first direction, the second direction and the third direction are perpendicular to each other.

[0012] According to another specific embodiment of the present application, the external air flows through the air inlet, the air inlet channel, the adjustment channel and the air outlet channel in sequence through the air outlet, and the uniform air supply is defined as follows: (V max -V av ) / V av ≤30%, or, (V av -V min ) / V av ≤30%, wherein Vmax is the maximum value of the wind speed measured at the air outlet, V av is the average value of the wind speed measured at the air outlet, and V minis the minimum value of the air velocity measurement at the air outlet.

[0013] According to another specific embodiment of the present application, the cross-sectional area of the outlet of the air inlet channel is S1, the cross-sectional area of any cross-section of the adjustment region is S2, and 0.04≤S1 / S2≤0.06.

[0014] According to another specific embodiment of the present application, the surface where the inlet of the adjustment channel is located is a second plane, and the distance between the first orifice plate and the second plane along the second direction is L1, and 0mm≤L1≤100mm.

[0015] According to another specific embodiment of the present application, the distance between the second orifice plate and the first plane along the second direction is L2, and 0mm≤L2≤100mm.

[0016] According to another specific embodiment of the present application, the adjustment region is a constant cross-section body along the first direction.

[0017] According to another specific embodiment of the present application, the adjustment channel is a constant cross-section body along the first direction.

[0018] According to another specific embodiment of the present application, the air inlet channel is a constant cross-section body.

[0019] According to another specific embodiment of the present application, the air inlet channel comprises a first air inlet channel and a second air inlet channel which are spaced apart along the third direction, and the first air inlet channel and the second air inlet channel respectively extend along the first direction.

[0020] According to another specific embodiment of the present application, the first air inlet channel and the second air inlet channel are both constant cross-section bodies.

[0021] According to another specific embodiment of the present application, the cross-sectional area of the first air inlet channel and the cross-sectional area of the second air inlet channel are equal.

[0022] According to another specific embodiment of the present application, the air inlet is arranged in an extension channel, and the extension channel respectively communicates with the first air inlet channel and the second air inlet channel.

[0023] According to another specific embodiment of the present application, the extension channel is parallel to the adjustment channel, and is spaced apart from the adjustment channel along the first direction.

[0024] According to another specific embodiment of the present application, the extension channel comprises a first portion, a second portion and a third portion which are sequentially communicated, the first portion communicates with the first air inlet channel, the air inlet is arranged in the second portion, and the third portion communicates with the second air inlet channel.

[0025] According to another specific embodiment of the present application, the opening ratio of the first hole plate, the third hole plate and the second hole plate is 30% to 80%.

[0026] According to another specific embodiment of the present application, further comprising: a transition channel, an inlet of the transition channel is connected with an outlet of the air inlet channel, an outlet of the transition channel is connected with an inlet of the adjustment channel, an area of a cross section of the outlet of the transition channel is greater than an area of a cross section of the inlet of the transition channel.

[0027] According to another specific embodiment of the present application, along the third direction, the inlet of the adjustment channel comprises a first inlet and a second inlet arranged at intervals, the transition channel comprises a first transition channel and a second transition channel arranged at intervals, the outlet of the air inlet channel comprises a first outlet and a second outlet arranged at intervals, the first transition channel is connected with the first outlet and the first inlet respectively, and the second transition channel is connected with the second outlet and the second inlet respectively.

[0028] According to another specific embodiment of the present application, along the first direction, the air outlet is higher than the adjustment channel, the air outlet extends along the third direction and is arranged towards the air inlet channel, along the third direction, the size of the air outlet, the size of the inlet of the air outlet channel and the size of the outlet of the adjustment channel are equal.

[0029] Embodiments of the present application further disclose an exhaust cabinet, comprising: a cabinet body having an inner cavity, the inner cavity constituting a working cavity; the air supplementing structure according to any one of the above, along the second direction, the working cavity is located between the air inlet channel and the air outlet, the air outlet is arranged below the cabinet body, and the air outlet is arranged towards the inner cavity to supply air into the working cavity.

[0030] According to another specific embodiment of the present application, along the first direction, the adjustment channel is located at the bottom of the cabinet body, and the air inlet is located at the top of the cabinet body. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A perspective view showing the air supplementing structure according to an embodiment of the present application Figure 1 ;

[0032] Figure 2 A perspective view showing the air supplementing structure according to an embodiment of the present application Figure 2 ;

[0033] Figure 3 A perspective view showing the air supplementing structure according to an embodiment of the present application Figure 3 ;

[0034] Figure 4 perspective view showing the air supplementing structure of the embodiment of the present application Figure 4 ;

[0035] Figure 5 side view showing the air supplementing structure of the embodiment of the present application Figure 1 ;

[0036] Figure 6 is Figure 5 cross-sectional view in A-A direction

[0037] Figure 7 perspective view showing the air supplementing structure of the embodiment of the present application Figure 5 ;

[0038] Figure 8 side view showing the air supplementing structure of the embodiment of the present application Figure 2 ;

[0039] Figure 9 side view showing the air outlet of the air supplementing structure of the embodiment of the present application Figure 1 ;

[0040] Figure 10 side view showing the air outlet of the air supplementing structure of the embodiment of the present application Figure 2 ;

[0041] Figure 11 side view showing the air outlet of the air supplementing structure of the embodiment of the present application Figure 3 ;

[0042] Figure 12 perspective view showing the exhaust cabinet of the embodiment of the present application Figure 1 ;

[0043] Figure 13 perspective view showing the exhaust cabinet of the embodiment of the present application Figure 2 ;

[0044] Figure 14 perspective view showing the exhaust cabinet of the embodiment of the present application Figure 3 ;

[0045] Figure 15 perspective view showing the exhaust cabinet of the embodiment of the present application Figure 4 ;

[0046] Figure 16 velocity distribution in the air supplementing structure of the embodiment of the present application Figure 1 ;

[0047] Figure 17 velocity distribution in the air supplementing structure of the embodiment of the present application Figure 2 ;

[0048] Figure 18 velocity distribution in the air supplementing structure of the embodiment of the present application Figure 3 ;

[0049] Figure 19 Velocity distribution within the air supplementing structure of the present application Figure 4 ;

[0050] Figure 20 Velocity distribution within the air supplementing structure of the present application Figure 5 . DETAILED DESCRIPTION

[0051] The following description will illustrate the implementation of the present application by specific embodiments, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present application. Although the description of the present application will be introduced in combination with the preferred embodiments, this does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications that can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0052] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0053] In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0054] The terms "first", "second", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0055] In the description of the present embodiment, it should also be noted that unless otherwise explicitly specified and limited, the terms "provided", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0056] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0057] refer to Figures 1 to 4 This invention provides a make-up air structure 1 for a fume hood, comprising: an air inlet channel 10, along a first direction ( Figure 1 Extending in the direction shown in the middle X direction, the air inlet channel 10 is provided with an air inlet 11; adjust the channel 20 along the second direction (as shown in the middle X direction). Figure 1 Extending along the second direction (as shown in the Y direction), the adjustment channel 20 has an inlet and an outlet, the inlet of the adjustment channel 20 being connected to the outlet of the air inlet channel 10; the air supply structure 1 also includes an air outlet channel 30, the air outlet channel 30 having an air outlet 31, the inlet of the air outlet channel 30 being connected to the outlet of the adjustment channel 20, and intersecting at a first plane (as shown in the Y direction). Figure 1 and Figure 2 (As shown in plane A).

[0058] refer to Figures 5 to 8 The first plane of the air supply structure 1 of the present invention and the side wall of the adjustment channel 20 form an adjustment area. Figure 5 , Figure 7 and Figure 8 As shown in the T-region), the adjustment area in any cross-section of the first direction ( Figure 6 The area of ​​the section shown in the middle P section is larger than the area of ​​the cross-section of the outlet of the air inlet channel 10. As a preferred embodiment of the present invention, the first plane of the air supply structure 1, the first perforated plate 21, and the sidewall of the adjustment channel 20 form an adjustment area.

[0059] With this setup, the outside air coming down from the air inlet channel 10 enters the adjustment channel 20, which is equivalent to moving from a small space to a large space. After passing through the first perforated plate 21, the outside air reduces the impact of the jet on the uneven flow field and converts some of the dynamic pressure into static pressure, reducing the speed of the outside air. After passing through the third perforated plate 32, the final air velocity at the air outlet 31 is uniform, so that air can be evenly delivered from the air outlet 31 to the working chamber of the exhaust cabinet 6, playing a role in stabilizing pressure and reducing noise.

[0060] It also includes one or any combination of the following: a first orifice plate 21, a second orifice plate 22, and a third orifice plate 32. That is, the air supply structure 1 includes a first orifice plate 21, a second orifice plate 22, or a third orifice plate 32; or a first orifice plate 21 and a second orifice plate 22; or a second orifice plate 22 and a third orifice plate 32; or a combination of a first orifice plate 21, a second orifice plate 22, and a third orifice plate 32. The air supply structure 1 is configured with an appropriate type of orifice plate according to the air volume of the air inlet 11.

[0061] wherein the first orifice plate 21 extends along a third direction (indicated by the black arrow in FIG. 1), the first orifice plate 21 is arranged in the adjustment channel 20, and the first direction, the second direction and the third direction are set at a certain angle with respect to each other. As a preferred embodiment of the present application, the first direction, the second direction and the third direction are perpendicular to each other. Figure 1 and Figure 3 wherein the second orifice plate 22 extends along the third direction (indicated by the black arrow in FIG. 1), the second orifice plate 22 is arranged in the adjustment region, and the first direction, the second direction and the third direction are set at a certain angle with respect to each other. As a preferred embodiment of the present application, the first direction, the second direction and the third direction are perpendicular to each other.

[0062] The certain angle between the first direction, the second direction and the third direction is selected according to the actual requirement of the air supplement structure. Preferably, the angle between the first direction and the second direction is 80° to 90°, inclusive of 80° and 90°; the angle between the first direction and the third direction is 80° to 90°, inclusive of 80° and 90°; and the angle between the second direction and the third direction is 80° to 90°, inclusive of 80° and 90°.

[0063] As a preferred embodiment of the present application, along the second direction, the projection of the first orifice plate 21 covers the projection of the inlet of the adjustment channel 20. In other words, along the second direction, the cross-sectional area of the projection of the first orifice plate 21 is greater than or equal to the cross-sectional area of the inlet of the adjustment channel 20.

[0064] Referring to Figure 3 , Figure 5 , Figure 7 and Figure 8 , the second orifice plate 22 extends along the third direction (indicated by the black arrow in FIG. 1), the second orifice plate 22 is arranged in the adjustment region, and the first direction, the second direction and the third direction are set at a certain angle with respect to each other. As a preferred embodiment of the present application, the first direction, the second direction and the third direction are perpendicular to each other. Figures 1 to 4

[0065] Figure 1 and Figure 2 , the third orifice plate 32 is arranged at the air outlet 31 and covers the air outlet 31. As a preferred embodiment of the present application, the third orifice plate 32 extends along the third direction.

[0066] ​As a preferred embodiment of the present application, the first hole plate 21 is perpendicular to the side walls of the adjustment channel 20, which include upper side walls and lower side walls spaced and arranged in parallel in the first direction, and left side walls and right side walls spaced and arranged in parallel in the third direction. As a preferred embodiment of the present application, the first hole plate 21 is connected perpendicularly to the upper side walls, the lower side walls, the left side walls and the right side walls of the adjustment channel 20. As a preferred embodiment of the present application, the first hole plate 21 is connected perpendicularly to one or any combination of the upper side walls, the lower side walls, the left side walls and the right side walls of the adjustment channel 20.

[0067] As a preferred embodiment of the present application, the first hole plate 21 has a dimension in the third direction greater than a dimension in the first direction. As a preferred embodiment of the present application, the second hole plate 22 is also perpendicular to the side walls of the adjustment channel 20, and the specific connection form is referred to the connection form of the first hole plate 21 and the side walls of the adjustment channel 20.

[0068] As a preferred embodiment of the present application, in the second direction, the two ends of the upper side walls, the lower side walls, the left side walls and the right side walls of the adjustment channel 20 enclose the inlet and the outlet of the adjustment channel 20, respectively. As a preferred embodiment of the present application, the adjustment channel 20 has a front side wall, in the second direction, one end of the upper side walls, the lower side walls, the left side walls of the adjustment channel 20 and the front side wall enclose the first inlet 23 of the adjustment channel 20, and one end of the upper side walls, the lower side walls, the right side walls of the adjustment channel 20 and the front side wall enclose the second inlet 24 of the adjustment channel 20. In other words, in the third direction, the first inlet 23 and the second inlet 24 of the adjustment channel 20 are spaced, and the front side wall of the adjustment channel 20 is located between the first inlet 23 and the second inlet 24.

[0069] As a preferred embodiment of the present application, the first direction is a vertical direction.

[0070] As a preferred embodiment of the present application, in the first direction, the air outlet 31 is higher than the adjustment channel 20, the air outlet 31 extends in the third direction and is arranged towards the air inlet channel 10, and in the third direction, the size of the air outlet 31, the size of the inlet of the air outlet channel 30 and the size of the outlet of the adjustment channel 20 are equal.

[0071] As a preferred embodiment of the present application, the air inlet channel 10 has a first outlet and a second outlet spaced in the third direction (indicated by the Z direction in the figure), the cross-sectional area of the outlet of the air inlet channel 10 is equal to the cross-sectional area of the first outlet (indicated by the N section in the figure) and the cross-sectional area of the second outlet (indicated by the M section in the figure). Figure 6 Figure 6 Figure 6 ​​The sum of the areas of the cross sections of the first outlet and the second outlet is equal to the sum of the areas of the cross sections of the first inlet and the second inlet. As a preferred embodiment of the present application, the area of the cross section of the first outlet is equal to the area of the cross section of the second outlet.

[0072] As a preferred embodiment of the present application, the open area ratio of the first hole plate 21 is 30% to 80%, inclusive. Further preferably, the open area ratio of the first hole plate 21 is 52%. Still further preferably, the open area ratio of the first hole plate 21 is 55%. The shape of the holes on the first hole plate 21 is not limited, and as a preferred embodiment of the present application, the first hole plate 21 is a hexagonal hole plate with a circumscribed circle diameter of 6 mm. The shape of the holes on the first hole plate 21 can also be various specifications such as circular, square, triangular, etc.

[0073] As a preferred embodiment of the present application, the open area ratio of the third hole plate 32 is 30% to 80%, inclusive. Further preferably, the open area ratio of the third hole plate 32 is 52%. Still further preferably, the open area ratio of the third hole plate 32 is 55%. The shape of the holes on the third hole plate 32 is not limited, and as a preferred embodiment of the present application, the third hole plate 32 is a hexagonal hole plate with a circumscribed circle diameter of 6 mm. The shape of the holes on the third hole plate 32 can also be various specifications such as circular, square, triangular, etc.

[0074] As a preferred embodiment of the present application, the ambient air flows through the air inlet 11, the air inlet channel 10, the adjustment channel 20, and the air outlet channel 30 in sequence, and is uniformly blown out by the air outlet 31. The uniform blowing is defined as follows: (V max -V av ) / V av ≤30%, or, (V av -V min ) / V av ≤30%, where V max is the maximum value of the air speed measured at the air outlet 31, V av is the average value of the air speed measured at the air outlet 31, and V min is the minimum value of the air speed measured at the air outlet 31. As a preferred embodiment of the present application, the uniform blowing is defined as follows: (V max -V av ) / V av ≤10%, or, (V av -V min ) / V av ≤10%. After the air supply structure 1 is provided with the first hole plate 21, the second hole plate 22, and the third hole plate 32 as described in the foregoing embodiments, the air outlet 31 uniformly blows out air, satisfying the definition of uniform blowing.

[0075] As a preferred embodiment of the present application, the area of the cross section of the outlet of the air inlet channel 10 is S1, the area of any cross section of the adjustment zone is S2, and 0.04≤S1 / S2≤0.06. As a preferred embodiment of the present application, 0.045≤S1 / S2≤0.056.

[0076] As a preferred embodiment of the present application, with reference to Figure 1 、 Figure 2 and Figure 5 , the surface where the inlet of the adjustment channel 20 is located is a second plane (as shown in the B plane in Figure 1 、 Figure 2 and Figure 5 ), along the second direction (as shown in the Y direction in Figure 5 ), the distance between the first hole plate 21 and the second plane B is L1, and 0mm≤L1≤100mm. When the first hole plate 21 is attached to the second plane, the value of L1 is 0mm. As a preferred embodiment of the present application, the front side wall of the adjustment channel 20 is located on the second plane. As a preferred embodiment of the present application, when the air volume of the air inlet 11 is in the range of 0cmh to 600cmh, the first hole plate 21 and the third hole plate 32 are provided, 0mm≤L1≤100mm, and the uniform air supply effect of the air outlet 31 is good, meeting the definition of uniform air supply.

[0077] As a preferred embodiment of the present application, with reference to Figure 3 、 Figure 5 、 Figure 7 and Figure 8 , a second hole plate 22 extending along the third direction is further provided in the adjustment channel 20, and the second hole plate 22 is located in the adjustment zone and is arranged in the second direction away from the first hole plate 21. After the external air passes through the adjustment zone, it is uniformly flowed through the first hole plate 21 once, the second hole plate 22 twice, and the third hole plate 32 three times in sequence, and the air speed of the air outlet 31 is more uniform.

[0078] As a preferred embodiment of the present application, the opening rate of the second hole plate 22 is 30% to 80%, including 30% and 80%. Further preferably, the opening rate of the second hole plate 22 is 52%. More preferably, the opening rate of the second hole plate 22 is 55%. The shape of the opening on the second hole plate 22 is not limited, and as a preferred embodiment of the present application, the second hole plate 22 adopts a hexagonal hole plate with an inscribed circle diameter of 6mm. The shape of the opening of the second hole plate 22 can also be various specifications of hole plates such as circular, square, and triangular.

[0079] As a preferred embodiment of the present application, with reference to Figure 5 , along the second direction (as shown in the Y direction in Figure 5The second aperture plate 22 is at a distance L2 from the first plane A (indicated by the arrow Y direction), and 0mm≤L2≤100mm. As a preferred embodiment of the present application, the value of L2 is 0mm when the second aperture plate 22 coincides with the first plane. Referring to Figure 7 and Figure 8 The second aperture plate 22 coincides with the first plane, i.e. the second aperture plate 22 is arranged at the junction of the inlet of the air outlet channel 30 and the outlet of the adjustment channel 20.

[0080] As a preferred embodiment of the present application, when the air volume of the air inlet 11 is in the range of 600cmh to 1000cmh, the first aperture plate 21, the second aperture plate 22 and the third aperture plate 32 are arranged, and the air outlet 31 has good uniform air supply effect, satisfying the definition of uniform air supply. Further preferably, when the air volume of the air inlet 11 is in the range of 600cmh to 1000cmh, the first aperture plate 21, the second aperture plate 22 and the third aperture plate 32 are arranged, 0mm≤L1≤100mm, and the air outlet 31 has good uniform air supply effect, satisfying the definition of uniform air supply.

[0081] Further preferably, when the air volume of the air inlet 11 is in the range of 600cmh to 1000cmh, the first aperture plate 21, the second aperture plate 22 and the third aperture plate 32 are arranged, L1 is 0mm, and the air outlet 31 has good uniform air supply effect, satisfying the definition of uniform air supply. Further preferably, when the air volume of the air inlet 11 is in the range of 600cmh to 1000cmh, the first aperture plate 21, the second aperture plate 22 and the third aperture plate 32 are arranged, L1 is 0mm, and L2 is 0mm, and the air outlet 31 has good uniform air supply effect, satisfying the definition of uniform air supply.

[0082] As a preferred embodiment of the present application, along the first direction, the adjustment region is a body of equal cross section. That is, the area of any cross section of the adjustment region in the first direction is equal. As a preferred embodiment of the present application, along the first direction, the adjustment channel 20 is a body of equal cross section. As a preferred embodiment of the present application, the adjustment channel 20 is in the shape of a cuboid.

[0083] As a preferred embodiment of the present application, the air inlet channel 10 is a body of equal cross section.

[0084] The number of air inlet channels 10 of the present application is not limited, and as a preferred embodiment of the present application, referring to Figure 1 and Figure 7, the air inlet channel 10 comprises a first air inlet channel 12 and a second air inlet channel 13 which are spaced apart along the third direction, and the first air inlet channel 12 and the second air inlet channel 13 respectively extend along the first direction. Preferably, the first air inlet channel 12 and the second air inlet channel 13 are both equal cross-section bodies. As a preferred embodiment of the present application, the first air inlet channel 12 and the second air inlet channel 13 are cuboids. More preferably, the cross-sectional area of the first air inlet channel 12 is equal to the cross-sectional area of the second air inlet channel 13. In other embodiments, the cross-sectional area of the first air inlet channel 12 can not be equal to the cross-sectional area of the second air inlet channel 13.

[0085] As a preferred embodiment of the present application, with reference to Figure 1 , the air supply structure 1 further comprises an extension channel 40, the air inlet 11 is arranged in the extension channel 40, and the extension channel 40 respectively communicates with the first air inlet channel 12 and the second air inlet channel 13. That is, the first air inlet channel 12 and the second air inlet channel 13 are also communicated, so that no matter how much the amount of external air is, it will flow into the first air inlet channel 12 and the second air inlet channel 13 through the extension channel 40 respectively, and finally flow into the adjustment channel 20, achieving self-balancing, and the air outlet 31 is uniformly outflowed.

[0086] As a preferred embodiment of the present application, the extension channel 40 is parallel to the adjustment channel 20 and is spaced apart from the adjustment channel 20 along the first direction. That is, along the first direction, the extension channel 40 is located above the adjustment channel 20.

[0087] As a preferred embodiment of the present application, with reference to Figure 1 , the extension channel 40 comprises a first portion 41, a second portion 42 and a third portion 43 which are sequentially communicated, the first portion 41 communicates with the first air inlet channel 12, the air inlet 11 is arranged in the second portion 42, and the third portion 43 communicates with the second air inlet channel 13. Preferably, the first portion 41 and the third portion 43 of the extension channel 40 respectively extend along the second direction, and the second portion 42 of the extension channel 40 extends along the third direction.

[0088] As a preferred embodiment of the present application, with reference to Figure 1 and Figure 6The air supplementing structure 1 further comprises a transition channel 50, an inlet of the transition channel 50 is connected with an outlet of the air inlet channel 10, an outlet of the transition channel 50 is connected with an inlet of the adjusting channel 20, and a cross-sectional area of the outlet of the transition channel 50 is greater than a cross-sectional area of the inlet of the transition channel 50. In this way, the transition channel 50 plays a role of flow equalization transition, so that the wind speed is not suddenly reduced, but gradually reduced, which is beneficial to uniform air outlet of the final air outlet 31.

[0089] That is, the external air from the air inlet channel 10 first enters the transition channel 50, and then enters the adjusting channel 20, which is equivalent to entering a small space from a medium space, and then entering a large space from the medium space. The dynamic pressure is gradually converted into static pressure, the influence of the jet flow on the flow field is reduced, the speed of the external air is reduced, the pressure stabilization and noise reduction are further played, and the air outlet speed of the final air outlet 31 is more uniform.

[0090] As a preferred embodiment of the present application, along the second direction, the cross-sectional area of the transition channel 50 gradually increases from the air inlet channel 10 to the adjusting channel 20 (indicated by the direction of the middle E). Figure 6 That is, the external air from the outlet of the air inlet channel 10 flows in the following flow path, and the space for flow becomes larger and larger until it flows into the large space of the adjusting channel 20. In this way, the dynamic pressure is converted into static pressure, the speed of the external air is reduced, and the pressure stabilization and noise reduction are further played.

[0091] As a preferred embodiment of the present application, referring to Figure 1 along the third direction, the inlet of the adjusting channel 20 comprises a first inlet 23 and a second inlet 24 which are arranged at intervals, the transition channel 50 comprises a first transition channel 51 and a second transition channel 52 which are arranged at intervals, and the outlet of the air inlet channel 10 comprises a first outlet and a second outlet which are arranged at intervals. The first transition channel 51 is connected with the first outlet and the first inlet 23 respectively, and the second transition channel 52 is connected with the second outlet and the second inlet 24 respectively.

[0092] Preferably, the first inlet 23 of the adjusting channel 20 and the second inlet 24 of the adjusting channel 20 are located on a second plane, a cross-sectional area of the first inlet 23 is S3, a cross-sectional area of the second inlet 24 is S4, and an area of the second plane is S5, wherein 0.3≤(S1+S4) / S5≤1. In this way, the air outlet speed of the final air outlet 31 is more uniform.

[0093] As a preferred embodiment of the present application, the cross-sectional area of the first inlet 23 of the adjusting channel 20 is S3, the cross-sectional area of the second inlet 24 of the adjusting channel 20 is S4, the cross-sectional area of the first outlet of the air inlet channel 10 is S6, and the cross-sectional area of the second outlet of the air inlet channel 10 is S7, wherein 0.52≤(S6+S7) / (S1+S4)≤0.67. In this way, the air outlet speed of the final air outlet 31 is more uniform.

[0094] In addition, it should be noted that the shape of the air outlet 31 of the air outlet channel 30 of the present application is not limited and can be air outlet. Preferably, referring to Figure 9 , the air outlet 31 includes a straight surface. Further preferably, referring to Figure 10 , the air outlet 31 includes an arc surface. Still further preferably, referring to Figure 11 , the air outlet 31 includes an inclined surface. The air outlet 31 of the above structure can make the air outlet speed of the air outlet 31 uniform.

[0095] Referring to Figure 12 , the present application also provides an exhaust cabinet 6, comprising: a cabinet body 60 having an inner cavity, wherein the inner cavity constitutes a working cavity; and the air supplementing structure 1 of any of the above embodiments, wherein the working cavity is located between the air inlet channel 10 and the air outlet 31 along the second direction, the air outlet 31 is arranged below the cabinet body 60, and the air outlet 31 is arranged towards the inner cavity to supply air to the working cavity. Since the air supplementing structure 1 of the above embodiments is used, the working cavity of the exhaust cabinet 6 of the present application is uniformly supplied with air by the air outlet 31.

[0096] Correspondingly, in the present embodiment, the air supplementing structure 1 is arranged behind the exhaust cabinet 6. The air inlet channel 10 of the air supplementing structure 1 is located at the rear side of the exhaust cabinet 6, rather than at both sides in the width direction (i.e. the third direction) of the exhaust cabinet 6. In this way, the thickness of the stand columns on both sides of the exhaust cabinet 6 can be reduced. Since the air outlet of the existing exhaust cabinet 6 is located in the middle of the top, the air inlet channel 10 of the existing exhaust cabinet 6 is located at both sides in the width direction of the cabinet body 60, and the stand columns on both sides are relatively thick (for example, the width of the stand column is 11.5 cm), which leads to the minimum negative pressure in the working cavity of the exhaust cabinet 6. By using the air supplementing structure 1 of the present application, the exhaust cabinet 6 can achieve air supplementing while using a narrow frame structure, and the thickness can be reduced, which can greatly reduce the negative pressure caused by turbulence and air resistance on both sides, so as to reduce the risk of leakage of harmful gases in the cabinet and improve the safety performance of the exhaust cabinet 6 itself.

[0097] Because laboratory space is expensive, such research environments place great emphasis on space utilization. The air supply structure 1 of this invention allows for the use of narrow bezels in the fume hoods 6, reducing the width space required by 115mm*2=230mm per hood compared to traditional fume hoods. In a laboratory with six hoods in a row, this saves 1.4 meters of width space, allowing for the placement of more experimental equipment (increasing R&D efficiency) or reducing the required area (lowering site costs). Because of the narrow bezel design, the total width of each fume hood can be retained, expanding the usable space inside the working chamber. This allows researchers to perform more experiments within each hood, thereby increasing experimental efficiency and research output.

[0098] Furthermore, the structure of the rear air intake duct 10 no longer requires a large, heavy structure "hanging" on the base structure of the fume hood, unlike many existing air supply structures. Because the air supply structure 1 of this invention has its center of gravity pulled backward, it is self-balancing and no longer experiences downward pressure. The amount of keel material and steel reinforcement used to support the traditional air supply structure in the fume hood can also be reduced. The overall weight of the fume hood 6 can be significantly reduced. Since the fume hood 6 requires manual handling during transportation and installation, this significant weight reduction can simultaneously and substantially reduce safety and workplace injury risks for installation personnel.

[0099] Furthermore, the air supply structure 1 of this invention does not require as many complex sheet metal bending parts and guide vanes, resulting in a much simpler structure. This reduces production difficulty and cost, while ensuring better quality consistency. Improved quality consistency in the fume hood 6 also indirectly improves its leakage rate and safety, better protecting users and researchers. As a preferred embodiment of this invention, see [reference needed]. Figure 7 and Figure 8 The air inlet channel 10 and air outlet channel 30 are made of extruded aluminum profiles, the transition channel 50 is made of plastic through molding, and the adjustment channel 20 is made of plastic extrusion to prevent corrosion. The first perforated plate 21 and the second perforated plate 22 are connected to the adjustment channel 20 by a slot insertion structure, and the third perforated plate 32 is connected to the air outlet channel 30 by a slot insertion structure, which facilitates installation and enhances strength.

[0100] As a preferred embodiment of the present invention, refer to Figure 12 and Figure 13 Along the first direction ( Figure 12 (As shown in the X direction), the adjustment channel 20 is located at the bottom of the cabinet 60, and the air inlet 11 is located at the top of the cabinet 60. As a preferred embodiment of the present invention, the extension channel 40 is located at the top of the cabinet 60, and correspondingly, the first part 41, the second part 42, and the third part 43 of the extension channel 40 are also located at the top of the cabinet 60.

[0101] In this embodiment, the number of air inlet channels 10 is two, including a first air inlet channel 12 and a second air inlet channel 13. Referring to Figure 14 and Figure 15 The technical solutions of other embodiments are basically the same as those of the above-mentioned embodiments, and the difference is only that the number of air inlet channels 10 in other embodiments is one. In other embodiments, other numbers of air inlet channels 10 can be provided, for example, three.

[0102] The following is a description of the results of testing whether the exhaust cabinet 6 of the air supplementing structure 1 of the present application meets the definition of uniform air supply.

[0103] As a preferred embodiment of the present application, referring to Figure 5 and Figure 6 , the air duct size of the two air inlet channels 10 of the air supplementing structure 1 is D(0.1m)*E(0.25m), and the total air inlet area (the cross-sectional area of the outlet of the air inlet channel 10) is: 0.1*0.25*2=0.05m 2 . The commonly used model of the Buhler exhaust cabinet is 1.5m and 1.8m. The commonly used air supplementing amount is 50% to 70% of the exhaust cabinet, that is, the commonly used air supplementing amount range is: 210m 3 / h to 1000m 3 / h. Among them, 210m 3 / h is the minimum air supplementing amount value, and 1000m 3 / h is the maximum air supplementing amount of the 1.8m cabinet.

[0104] V 进 =Q(air volume) / S(area), the calculation range value is: 210 / 0.05 / 3600 to 1000 / 0.05 / 3600=1.165m / s to 5.55m / s. That is, the air outlet speed of the outlet of the air inlet channel 10 is 1.165m / s to 5.55m / s. The following takes the commonly used size of the 1.5m exhaust cabinet as an example, the size of the air outlet channel 30 and the adjusting channel 20 is equal, referring to Figure 5 and Figure 6 , the total width of the air outlet duct W=1450mm, the sum of the depth of the air outlet channel 30 and the adjusting channel 20 P=850mm, and the height of the adjusting channel 20 H=100mm.

[0105] Test one

[0106] The air supplementing structure 1 is not provided with the first hole plate 21, the second hole plate 22 and the third hole plate 32, and the air inlet amount of the air inlet 11 is 400cmh.

[0107] Referring to Table 2, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as follows: Vmax = 2.65 m / s, Vmin = 1.14 m / s, Vav = 1.91 m / s, (2.65-1.91) / 1.91 = 38.7%, (1.91-1.14) / 1.91 = 40.3%, the air outlet uniformity at the air outlet 31 does not meet the uniform air supply definition value ≤30%. Referring to Table 2, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as follows: Vmax = 2.65 m / s, Vmin = 1.14 m / s, Vav = 1.91 m / s, (2.65-1.91) / 1.91 = 38.7%, (1.91-1.14) / 1.91 = 40.3%, the air outlet uniformity at the air outlet 31 does not meet the uniform air supply definition value ≤30%. Figure 16 Without the first hole plate 21, the third hole plate 32 and the second hole plate 22, the jet flow is serious, the conversion rate between the dynamic pressure and the static pressure is low, and the air speed at the air outlet 31 of the air outlet channel 30 is not uniform.

[0108] Table 1 is the air speed distribution of each measuring point at the air outlet

[0109] Target Name Unit Value PG Speed 1 [m / s] 2.385714089 PG Speed 2 [m / s] 2.616312822 PG Speed 3 [m / s] 2.656895104 PG Speed 4 [m / s] 2.479549596 PG Speed 5 [m / s] 2.196822285 PG Speed 6 [m / s] 2.02435093 PG Speed 7 [m / s] 2.236065315 PG Speed 8 [m / s] 2.076634032 PG Speed 9 [m / s] 1.899964206 PG Speed 10 [m / s] 1.780917768 PG Speed 11 [m / s] 1.621848424 PG Speed 12 [m / s] 1.996432811 PG Speed 13 [m / s] 1.738375034 PG Speed 14 [m / s] 1.36386214 PG Speed 15 [m / s] 1.133920573 PG Speed 16 [m / s] 1.153817439 PG Speed 17 [m / s] 1.156199297 PG Speed 18 [m / s] 1.773939891

[0110] Test two

[0111] The air supply structure 1 is provided with the first hole plate 21 and the third hole plate 32, the air inlet amount of the air inlet 11 is 600 cmh, and L1 = 100 mm.

[0112] Referring to Table 2, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as follows: Vmax = 2.65 m / s, Vmin = 1.14 m / s, Vav = 1.91 m / s, (2.65-1.91) / 1.91 = 38.7%, (1.91-1.14) / 1.91 = 40.3%, the air outlet uniformity at the air outlet 31 does not meet the uniform air supply definition value ≤30%. Referring to Table 2, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as follows: Vmax = 2.65 m / s, Vmin = 1.14 m / s, Vav = 1.91 m / s, (2.65-1.91) / 1.91 = 38.7%, (1.91-1.14) / 1.91 = 40.3%, the air outlet uniformity at the air outlet 31 does not meet the uniform air supply definition value ≤30%. Figure 17 After the first hole plate 21 and the third hole plate 32 are set, the jet flow is reduced, and the air speed at the air outlet 31 of the air outlet channel 30 is uniform.

[0113] Table 2 is the air speed distribution of each measuring point at the air outlet

[0114] Target Name Unit Value PG Speed 1 [m / s] 2.334895659 PG Speed 2 [m / s] 2.392896418 PG Speed 3 [m / s] 2.400675312 PG Speed 4 [m / s] 2.337480975 PG Speed 5 [m / s] 2.231768365 PG Speed 6 [m / s] 2.13825641 PG Speed 7 [m / s] 2.19933873 PG Speed 8 [m / s] 2.246100738 PG Speed 9 [m / s] 2.244636297 PG Speed 10 [m / s] 2.184885558 PG Speed 11 [m / s] 2.101904028 PG Speed 12 [m / s] 2.083869666 PG Speed 13 [m / s] 2.216305333 PG Speed 14 [m / s] 2.195685025 PG Speed 15 [m / s] 2.193496236 PG Speed 16 [m / s] 2.127418155 PG Speed 17 [m / s] 2.033013939 PG Speed 18 [m / s] 2.179047331

[0115] Test three

[0116] The air supply structure 1 is provided with the first hole plate 21 and the third hole plate 32, the air inlet amount of the air inlet 11 is 800 cmh, and L1 = 100 mm.

[0117] Referring to Table 3, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as: Vmax = 3.23 m / s, Vmin = 2.68 m / s, Vav = 2.93 m / s, (3.23-2.93) / 2.93 = 10.23%, (2.93-2.68) / 2.93 = 8.5%, the air outlet uniformity at the air outlet 31 meets the uniform air supply definition value ≤30%. According to the CFD analysis, after the first perforated plate 21 and the third perforated plate 32 are arranged, the jet flow influence is reduced, and the air speed at the air outlet 31 of the air outlet channel 30 is uniform.

[0118] Table 3 is the air speed distribution of each measuring point at the air outlet

[0119] Target Name Unit Value PG Speed 1 [m / s] 3.128047478 PG Speed 2 [m / s] 3.203683048 PG Speed 3 [m / s] 3.21516653 PG Speed 4 [m / s] 3.129851596 PG Speed 5 [m / s] 2.982438645 PG Speed 6 [m / s] 2.840640495 PG Speed 7 [m / s] 2.947052573 PG Speed 8 [m / s] 3.004600712 PG Speed 9 [m / s] 2.999995575 PG Speed 10 [m / s] 2.919167365 PG Speed 11 [m / s] 2.804660765 PG Speed 12 [m / s] 2.775486799 PG Speed 13 [m / s] 2.965623839 PG Speed 14 [m / s] 2.931338406 PG Speed 15 [m / s] 2.924468579 PG Speed 16 [m / s] 2.834401667 PG Speed 17 [m / s] 2.701930765 PG Speed 18 [m / s] 2.921875624

[0120] Test four

[0121] The air supply structure 1 is provided with the first perforated plate 21, the second perforated plate 22 and the third perforated plate 32, the air inlet 11 has an air inlet amount of 600 cmh, L1 = 0 mm, and L2 = 100 mm.

[0122] Referring to Table 4, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as: Vmax = 2.33 m / s, Vmin = 2.08 m / s, Vav = 2.2 m / s, (2.33-2.2) / 2.2 = 5.9%, (2.2-2.08) / 2.2 = 5.4%, the air outlet uniformity at the air outlet 31 meets the uniform air supply definition value ≤30%. Referring to Figure 18 , after the first perforated plate 21 and the third perforated plate 32 are arranged, the jet flow influence is reduced, and the air speed at the air outlet 31 of the air outlet channel 30 is uniform.

[0123] Table 4 is the air speed distribution of each measuring point at the air outlet

[0124] Target Name Unit Value PG Speed 1 [m / s] 2.306 PG Speed 2 [m / s] 2.333 PG Speed 3 [m / s] 2.327 PG Speed 4 [m / s] 2.302 PG Speed 5 [m / s] 2.276 PG Speed 6 [m / s] 2.269 PG Speed 7 [m / s] 2.167 PG Speed 8 [m / s] 2.199 PG Speed 9 [m / s] 2.192 PG Speed 10 [m / s] 2.178 PG Speed 11 [m / s] 2.164 PG Speed 12 [m / s] 2.161 PG Speed 13 [m / s] 2.168 PG Speed 14 [m / s] 2.144 PG Speed 15 [m / s] 2.136 PG Speed 16 [m / s] 2.115 PG speed 17 [m / s] 2.093 PG speed 18 [m / s] 2.083

[0125] Test five

[0126] The air supply structure 1 is provided with the first perforated plate 21, the second perforated plate 22 and the third perforated plate 32, the air inlet 11 has an air inlet amount of 800 cmh, L1 = 0 mm, and L2 = 100 mm.

[0127] Referring to Table 5, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as: Vmax = 3.11 m / s, Vmin = 2.76 m / s, Vav = 2.93 m / s, (3.11-2.93) / 2.93 = 6.14%, (2.93-2.76) / 2.93 = 5.8%, the air outlet uniformity at the air outlet 31 meets the uniform air supply definition value ≤30%. According to the CFD analysis, after the first orifice plate 21, the third orifice plate 32 and the second orifice plate 22 are arranged, the jet influence is reduced, and the air speed at the air outlet 31 of the air outlet channel 30 is uniform.

[0128] Table 5 is the air speed distribution of each measuring point at the air outlet

[0129] Target name Unit Value PG speed 1 [m / s] 3.0882819 PG speed 2 [m / s] 3.117637317 PG speed 3 [m / s] 3.10895475 PG speed 4 [m / s] 3.079573745 PG speed 5 [m / s] 3.042321869 PG speed 6 [m / s] 3.027324125 PG speed 7 [m / s] 2.905962853 PG speed 8 [m / s] 2.936584774 PG speed 9 [m / s] 2.927111129 PG speed 10 [m / s] 2.906331966 PG speed 11 [m / s] 2.891068347 PG speed 12 [m / s] 2.885842769 PG speed 13 [m / s] 2.891147588 PG speed 14 [m / s] 2.854496679 PG speed 15 [m / s] 2.843235345 PG speed 16 [m / s] 2.813920323 PG speed 17 [m / s] 2.785516443 PG speed 18 [m / s] 2.768116336

[0130] Test six

[0131] The air supply structure 1 is provided with the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32, the air inlet amount of the air inlet 11 is 1000 cmh, L1 = 0 mm, L2 = 100 mm.

[0132] Referring to Table 6, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as: Vmax = 3.9 m / s, Vmin = 3.448 m / s, Vav = 3.67 m / s, (3.9-3.67) / 3.67 = 6.2%, (3.67-3.448) / 3.67 = 6.05%, the air outlet uniformity at the air outlet 31 meets the uniform air supply definition value ≤30%. According to the CFD analysis, after the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32 are arranged, the jet influence is reduced, and the air speed at the air outlet 31 of the air outlet channel 30 is uniform.

[0133] Table 6 is the air speed distribution of each measuring point at the air outlet

[0134] Target name Unit Value PG speed 1 [m / s] 3.86824753 PG speed 2 [m / s] 3.902037656 PG speed 3 [m / s] 3.889007782 PG speed 4 [m / s] 3.854135102 PG speed 5 [m / s] 3.80628454 PG speed 6 [m / s] 3.78811992 PG speed 7 [m / s] 3.648318802 PG speed 8 [m / s] 3.673234571 PG speed 9 [m / s] 3.661553771 PG speed 10 [m / s] 3.63571388 PG speed 11 [m / s] 3.617960143 PG speed 12 [m / s] 3.611505318 PG speed 13 [m / s] 3.601247972 PG speed 14 [m / s] 3.561641736 PG speed 15 [m / s] 3.548156498 PG speed 16 [m / s] 3.50829862 PG speed 17 [m / s] 3.47644256 PG speed 18 [m / s] 3.454477464

[0135] Test seven

[0136] The air supply structure 1 is provided with the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32, the air inlet amount of the air inlet 11 is 800 cmh, L1 = 0 mm, L2 = 0 mm.

[0137] Referring to Table 7, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as: Vmax = 3.04 m / s, Vmin = 2.81 m / s, Vav = 2.93 m / s, (3.04-2.93) / 2.93 = 3.75%, (2.93-2.81) / 2.93 = 4%, the air outlet uniformity at the air outlet 31 meets the uniform air supply definition value ≤30%. Referring to Figure 19, after setting the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32, the jet flow effect is reduced, and the air outlet 31 of the air outlet channel 30 has uniform air speed.

[0138] Table 7 is the air speed distribution of each measuring point at the air outlet

[0139] Target name Unit Value PG speed 1 [m / s] 3.017935976 PG speed 2 [m / s] 3.041849823 PG speed 3 [m / s] 3.026122079 PG speed 4 [m / s] 2.991537199 PG speed 5 [m / s] 2.958744074 PG speed 6 [m / s] 2.951902925 PG speed 7 [m / s] 2.914667644 PG speed 8 [m / s] 2.920021788 PG speed 9 [m / s] 2.900612828 PG speed 10 [m / s] 2.865811764 PG speed 11 [m / s] 2.845785652 PG speed 12 [m / s] 2.854950333 PG speed 13 [m / s] 2.991958713 PG speed 14 [m / s] 2.98920703 PG speed 15 [m / s] 2.967500213 PG speed 16 [m / s] 2.904922554 PG speed 17 [m / s] 2.850821513 PG speed 18 [m / s] 2.824951258

[0140] Test eight

[0141] The air inlet structure 1 is provided with the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32, the air inlet amount of the air inlet 11 is 1000 cmh, L1=0 mm, and L2=0 mm.

[0142] Referring to Table 8, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as follows: Vmax=3.8 m / s, Vmin=3.522 m / s, Vav=3.67 m / s, (3.8-3.67) / 3.67=3.5%, (3.67-3.522) / 3.67=4%, the air outlet uniformity at the air outlet 31 meets the definition value ≤30% of uniform air supply. Referring to Figure 20 , after setting the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32, the jet flow effect is reduced, and the air outlet 31 of the air outlet channel 30 has uniform air speed.

[0143] Table 8 is the air speed distribution of each measuring point at the air outlet

[0144] Target name Unit Value PG speed 1 [m / s] 3.777597978 PG speed 2 [m / s] 3.799827888 PG speed 3 [m / s] 3.790732968 PG speed 4 [m / s] 3.745114009 PG speed 5 [m / s] 3.703668995 PG speed 6 [m / s] 3.698048297 PG speed 7 [m / s] 3.65373501 PG speed 8 [m / s] 3.655805843 PG speed 9 [m / s] 3.628308441 PG speed 10 [m / s] 3.584061148 PG speed 11 [m / s] 3.565497735 PG speed 12 [m / s] 3.575346058 PG speed 13 [m / s] 3.733241276 PG speed 14 [m / s] 3.733234973 PG speed 15 [m / s] 3.707987327 PG speed 16 [m / s] 3.626720679 PG speed 17 [m / s] 3.558742679 PG speed 18 [m / s] 3.521752257

[0145] Test nine

[0146] The air inlet structure 1 is provided with the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32, the air inlet amount of the air inlet 11 is 800 cmh, L1=0 mm, and L2=150 mm.

[0147] Referring to Table 9, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as follows: Vmax=3.12 m / s, Vmin=2.76 m / s, Vav=2.93 m / s, (3.12-2.93) / 2.93=6.5%, (2.93-2.76) / 2.93=5.8%, the air outlet uniformity at the air outlet 31 meets the definition value ≤30% of uniform air supply. According to the CFD analysis, after setting the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32, the jet flow effect is reduced, and the air outlet 31 of the air outlet channel 30 has uniform air speed.

[0148] Table 9 is the air speed distribution of each measuring point at the air outlet

[0149] Target name Unit Value PG speed 1 [m / s] 3.091618679 PG speed 2 [m / s] 3.12301717 PG speed 3 [m / s] 3.11300702 PG speed 4 [m / s] 3.081644677 PG speed 5 [m / s] 3.039915781 PG speed 6 [m / s] 3.021144599 PG speed 7 [m / s] 2.906974466 PG speed 8 [m / s] 2.939554999 PG speed 9 [m / s] 2.92971798 PG speed 10 [m / s] 2.909926144 PG speed 11 [m / s] 2.89016823 PG speed 12 [m / s] 2.879315908 PG speed 13 [m / s] 2.877284066 PG speed 14 [m / s] 2.851071104 PG speed 15 [m / s] 2.840488329 PG speed 16 [m / s] 2.809661424 PG speed 17 [m / s] 2.781976149 PG speed 18 [m / s] 2.763813726

[0150] Test ten

[0151] The air supplement structure 1 is provided with the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32, the air inlet 11 has an air inlet volume of 1000 cmh, L1=0 mm and L2=150 mm.

[0152] Referring to Table 10, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as Vmax=3.9 m / s, Vmin=3.44 m / s, Vav=3.67 m / s, (3.9-3.67) / 3.67=6.26%, (3.67-3.44) / 3.67=6.26%, and the air outlet uniformity at the air outlet 31 meets the definition value ≤30% of uniform air supply. According to the CFD analysis, after the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32 are arranged, the jet influence is reduced, and the air speed at the air outlet 31 of the air outlet channel 30 is uniform.

[0153] Table 10 is the air speed distribution of each measuring point at the air outlet

[0154] Target name Unit Value PG speed 1 [m / s] 3.871659588 PG speed 2 [m / s] 3.907454376 PG speed 3 [m / s] 3.895334618 PG speed 4 [m / s] 3.859275801 PG speed 5 [m / s] 3.802701815 PG speed 6 [m / s] 3.779189714 PG speed 7 [m / s] 3.645152491 PG speed 8 [m / s] 3.676770229 PG speed 9 [m / s] 3.665137504 PG speed 10 [m / s] 3.638564615 PG speed 11 [m / s] 3.616521982 PG speed 12 [m / s] 3.603103667 PG speed 13 [m / s] 3.591698789 PG speed 14 [m / s] 3.557678873 PG speed 15 [m / s] 3.544680214 PG speed 16 [m / s] 3.505282211 PG speed 17 [m / s] 3.471022994 PG speed 18 [m / s] 3.450350695

[0155] Test eleven

[0156] The air supplement structure 1 is provided with the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32, the air inlet 11 has an air inlet volume of 800 cmh, L1=0 mm and L2=250 mm.

[0157] Referring to Table 11, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as Vmax=3.12 m / s, Vmin=2.75 m / s, Vav=2.93 m / s, (3.12-2.93) / 2.93=6.5%, (2.93-2.75) / 2.93=5.8%, and the air outlet uniformity at the air outlet 31 meets the definition value ≤30% of uniform air supply. According to the CFD analysis, after the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32 are arranged, the jet influence is reduced, and the air speed at the air outlet 31 of the air outlet channel 30 is uniform.

[0158] Table 11 is the air speed distribution of each measuring point at the air outlet

[0159] Target name Unit Value PG speed 1 [m / s] 3.087239426 PG speed 2 [m / s] 3.121689751 PG speed 3 [m / s] 3.107721958 PG speed 4 [m / s] 3.076578966 PG speed 5 [m / s] 3.0306534 PG speed 6 [m / s] 3.009613153 PG speed 7 [m / s] 2.906639699 PG speed 8 [m / s] 2.946101887 PG speed 9 [m / s] 2.936103917 PG speed 10 [m / s] 2.911950307 PG speed 11 [m / s] 2.884925472 PG speed 12 [m / s] 2.865728058 PG speed 13 [m / s] 2.904779718 PG speed 14 [m / s] 2.860604156 PG speed 15 [m / s] 2.848452582 PG speed 16 [m / s] 2.816419883 PG speed 17 [m / s] 2.778778539 PG speed 18 [m / s] 2.760235151

[0160] Test twelve

[0161] The air supplement structure 1 is provided with the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32, the air inlet 11 has an air inlet volume of 1000 cmh, L1=0 mm and L2=250 mm.

[0162] Referring to Table 12, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as follows: Vmax = 3.9 m / s, Vmin = 3.44 m / s, Vav = 3.67 m / s, (3.9-3.67) / 3.67 = 6.26%, (3.67-3.44) / 3.67 = 6.26%, the air outlet uniformity at the air outlet 31 meets the uniform air supply definition value ≤ 30%. According to the CFD analysis, after the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32 are arranged, the jet influence is reduced, and the air speed at the air outlet 31 of the air outlet channel 30 is uniform.

[0163] Table 12 is the air speed distribution of each measuring point at the air outlet

[0164] Target name Unit Value PG speed 1 [m / s] 3.866106877 PG speed 2 [m / s] 3.906108785 PG speed 3 [m / s] 3.89228555 PG speed 4 [m / s] 3.849516265 PG speed 5 [m / s] 3.793229505 PG speed 6 [m / s] 3.763447736 PG speed 7 [m / s] 3.64524011 PG speed 8 [m / s] 3.686311332 PG speed 9 [m / s] 3.671226761 PG speed 10 [m / s] 3.642622365 PG speed 11 [m / s] 3.609930131 PG speed 12 [m / s] 3.585955333 PG speed 13 [m / s] 3.628120334 PG speed 14 [m / s] 3.569867055 PG speed 15 [m / s] 3.555722658 PG speed 16 [m / s] 3.511202478 PG speed 17 [m / s] 3.468609501 PG speed 18 [m / s] 3.446989944

[0165] Test thirteen

[0166] The air supply structure 1 is provided with the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32, the air inlet amount of the air inlet 11 is 1000 cmh, L1 = 0 mm, and L2 = 450 mm.

[0167] Referring to Table 13, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as follows: Vmax = 3.95 m / s, Vmin = 3.40 m / s, Vav = 3.67 m / s, (3.95-3.67) / 3.67 = 7.6%, (3.67-3.4) / 3.67 = 6.3%, the air outlet uniformity at the air outlet 31 meets the uniform air supply definition value ≤ 30%. According to the CFD analysis, after the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32 are arranged, the jet influence is reduced, and the air speed at the air outlet 31 of the air outlet channel 30 is uniform.

[0168] Table 13 is the air speed distribution of each measuring point at the air outlet

[0169] Target name Unit Value PG speed 1 [m / s] 3.899214843 PG speed 2 [m / s] 3.952677217 PG speed 3 [m / s] 3.949373925 PG speed 4 [m / s] 3.874420974 PG speed 5 [m / s] 3.741908901 PG speed 6 [m / s] 3.633608939 PG speed 7 [m / s] 3.683306678 PG speed 8 [m / s] 3.736619097 PG speed 9 [m / s] 3.715396826 PG speed 10 [m / s] 3.643746798 PG speed 11 [m / s] 3.55629015 PG speed 12 [m / s] 3.505815184 PG speed 13 [m / s] 3.704470386 PG speed 14 [m / s] 3.63393023 PG speed 15 [m / s] 3.613397196 PG speed 16 [m / s] 3.519420034 PG speed 17 [m / s] 3.41245009 PG speed 18 [m / s] 3.602369847

[0170] Test fourteen

[0171] The air supply structure 1 is provided with the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32, the air inlet amount of the air inlet 11 is 800 cmh, L1 = 0 mm, and L2 = 450 mm.

[0172] Referring to Table 14, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as: Vmax = 3.16 m / s, Vmin = 2.73 m / s, Vav = 2.93 m / s, (3.16-2.93) / 2.93 = 7.8%, (2.93-2.73) / 2.93 = 6.8%, the air outlet uniformity at the air outlet 31 meets the uniform air supply definition value ≤30%. According to the CFD analysis, after the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32 are arranged, the jet influence is reduced, and the air speed at the air outlet 31 of the air outlet channel 30 is uniform.

[0173] Table 14 is the air speed distribution of each measuring point at the air outlet

[0174] Target name Unit Value PG speed 1 [m / s] 3.114053954 PG speed 2 [m / s] 3.162015067 PG speed 3 [m / s] 3.154244783 PG speed 4 [m / s] 3.093496001 PG speed 5 [m / s] 2.990673652 PG speed 6 [m / s] 2.905686611 PG speed 7 [m / s] 2.938328292 PG speed 8 [m / s] 2.986404659 PG speed 9 [m / s] 2.970638368 PG speed 10 [m / s] 2.912333573 PG speed 11 [m / s] 2.842905471 PG speed 12 [m / s] 2.805523473 PG speed 13 [m / s] 2.97427703 PG speed 14 [m / s] 2.911295531 PG speed 15 [m / s] 2.894065394 PG speed 16 [m / s] 2.821976438 PG speed 17 [m / s] PG speed 18 [m / s] Target name Unit Value PG speed 1 [m / s] PG speed 2 [m / s] PG speed 3 [m / s] PG speed 4 [m / s] PG speed 5 [m / s] PG speed 6 [m / s] PG speed 7 [m / s] PG speed 8 [m / s] PG speed 9 [m / s] PG speed 10 [m / s] PG speed 11 [m / s] PG speed 12 [m / s] PG speed 13 [m / s] PG speed 14 [m / s] PG speed 15 [m / s] PG speed 16 [m / s] PG speed 17 [m / s] PG speed 18 [m / s] Target name Unit Value 2.733455049 PG speed 18 [m / s] 2.881572447

[0175] Test fifteen

[0176] The air supply structure 1 is provided with the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32, the air inlet amount of the air inlet 11 is 1000 cmh, L1 = 0 mm, and the second orifice plate 22 is 5 mm away from the first orifice plate 21.

[0177] Referring to Table 15, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as: Vmax = 3.99 m / s, Vmin = 3.38 m / s, Vav = 3.67 m / s, (3.99-3.67) / 3.67 = 8.7%, (3.67-3.38) / 3.67 = 7.9%, the air outlet uniformity at the air outlet 31 meets the uniform air supply definition value ≤30%. According to the CFD analysis, after the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32 are arranged, the jet influence is reduced, and the air speed at the air outlet 31 of the air outlet channel 30 is uniform.

[0178] Table 15 is the air speed distribution of each measuring point at the air outlet

[0179] Target name Unit Value PG speed 1 [m / s] 3.873018342 PG speed 2 [m / s] 3.976158514 PG speed 3 [m / s] 3.997588683 PG speed 4 [m / s] 3.90889747 PG speed 5 [m / s] 3.744167662 PG speed 6 [m / s] 3.590122345 PG speed 7 [m / s] 3.662673032 PG speed 8 [m / s] 3.745795972 PG speed 9 [m / s] 3.751455701 PG speed 10 [m / s] 3.662713343 PG speed 11 [m / s] 3.531384887 PG speed 12 [m / s] 3.489743869 PG speed 13 [m / s] 3.690726406 PG speed 14 [m / s] 3.641048749 PG speed 15 [m / s] 3.657041787 PG speed 16 [m / s] 3.542560747 PG speed 17 [m / s] 3.388200927 PG speed 18 [m / s] 3.644291696

[0180] Test sixteen

[0181] The air supply structure 1 is provided with the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32, the air inlet amount of the air inlet 11 is 800 cmh, L1 = 0 mm, and the second orifice plate 22 is 5 mm away from the first orifice plate 21.

[0182] Referring to Table 16, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as follows: Vmax = 3.19 m / s, Vmin = 2.71 m / s, Vav = 2.93 m / s, (3.19-2.93) / 2.93 = 8.8%, (2.93-2.71) / 2.93 = 7.5%, the air outlet uniformity at the air outlet 31 meets the uniform air supply definition value ≤30%. According to the CFD analysis, after the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32 are arranged, the jet influence is reduced, and the air speed at the air outlet 31 of the air outlet channel 30 is uniform.

[0183] Table 16 is the wind speed distribution of each measuring point at the air outlet

[0184] Target name Unit Value PG speed 1 [m / s] 3.092702657 PG speed 2 [m / s] 3.176015918 PG speed 3 [m / s] 3.192801457 PG speed 4 [m / s] 3.121802373 PG speed 5 [m / s] 2.989966661 PG speed 6 [m / s] 2.87277087 PG speed 7 [m / s] 2.919934279 PG speed 8 [m / s] 2.993502883 PG speed 9 [m / s] 3.000223868 PG speed 10 [m / s] 2.924850752 PG speed 11 [m / s] 2.821966723 PG speed 12 [m / s] 2.791990464 PG speed 13 [m / s] 2.962822308 PG speed 14 [m / s] 2.913682496 PG speed 15 [m / s] 2.926987609 PG speed 16 [m / s] 2.835751997 PG speed 17 [m / s] 2.713461566 PG speed 18 [m / s] 2.900635935

[0185] Test Seventeen

[0186] The air supply structure 1 is not provided with the first orifice plate 21, the second orifice plate 22 and the third orifice plate 32, and the air inlet amount of the air inlet 11 is 1000 cmh.

[0187] Referring to Table 17, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as follows: Vmax = 6.68 m / s, Vmin = 2.81 m / s, Vav = 4.86 m / s, (6.68-4.86) / 4.86 = 37.4%, (4.86-2.81) / 4.86 = 42.2%, the air outlet uniformity at the air outlet 31 does not meet the uniform air supply definition value ≤30%.

[0188] Table 17 is the wind speed distribution of each measuring point at the air outlet

[0189] Target name Unit Value PG speed 1 [m / s] 6.289163038 PG speed 2 [m / s] 6.632033984 PG speed 3 [m / s] 6.683448601 PG speed 4 [m / s] 6.221387078 PG speed 5 [m / s] 5.64146792 PG speed 6 [m / s] 4.990586733 PG speed 7 [m / s] 5.88091805 PG speed 8 [m / s] 5.118647566 PG speed 9 [m / s] 4.729374197 PG speed 10 [m / s] 4.498838892 PG speed 11 [m / s] 4.351222867 PG speed 12 [m / s] 4.852590549 PG speed 13 [m / s] 5.037284308 PG speed 14 [m / s] 3.223849075 PG speed 15 [m / s] 2.811670771 PG speed 16 [m / s] 3.025704204 PG speed 17 [m / s] 3.276949221 PG speed 18 [m / s] 4.278005326

[0190] Test Eighteen

[0191] The air supply structure 1 is provided with the third orifice plate 32, and the air inlet amount of the air inlet 11 is 1000 cmh.

[0192] Referring to Table 18, the air outlet uniformity at the air outlet 31 of the air outlet channel 30 is calculated as follows: Vmax = 4.84 m / s, Vmin = 3.06 m / s, Vav = 3.77 m / s, (4.84-3.77) / 3.77 = 28.38%, (3.77-3.06) / 3.77 = 18.83%, the air outlet uniformity at the air outlet 31 meets the uniform air supply definition value ≤30%. According to the CFD analysis, after the third orifice plate 32 is arranged, the jet influence is reduced, and the air speed at the air outlet 31 of the air outlet channel 30 is uniform.

[0193] Table 18 is the wind speed distribution of each measuring point at the air outlet

[0194] Target name Unit Value PG speed 1 [m / s] 4.096701778 PG speed 2 [m / s] 4.604917719 PG speed 3 [m / s] 4.843106506 PG speed 4 [m / s] 4.388793714 PG speed 5 [m / s] 3.687441505 PG speed 6 [m / s] 3.432288656 PG speed 7 [m / s] 3.845476938 PG speed 8 [m / s] 3.95400389 PG speed 9 [m / s] 4.040592212 PG speed 10 [m / s] 3.638466407 PG speed 11 [m / s] 3.251954931 PG speed 12 [m / s] 3.315146979 PG speed 13 [m / s] 3.72812382 PG speed 14 [m / s] 3.640653256 PG speed 15 [m / s] 3.653703548 PG speed 16 [m / s] 3.410048559 PG speed 17 [m / s] 3.06084626 PG speed 18 [m / s] Target name Unit Value PG speed 1 [m / s] PG speed 2 [m / s] PG speed 3 [m / s] PG speed 4 [m / s] PG speed 5 [m / s] PG speed 6 [m / s] PG speed 7 [m / s] PG speed 8 [m / s] PG speed 9 [m / s] PG speed 10 [m / s] PG speed 11 [m / s] PG speed 12 [m / s] PG speed 13 [m / s] PG speed 14 [m / s] PG speed 15 [m / s] PG speed 16 [m / s] PG speed 17 [m / s] PG speed 18 [m / s] 3.485430177

[0195] In summary, the air outlet velocity of the air outlet 31 of the exhaust cabinet 6 using the air supplementing structure 1 of the present application is uniform.

[0196] Although the present application has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood that the above description is a further explanation of the application in connection with the detailed description and should not be construed as a limitation of the application. Various changes and modifications can be made to the application by those skilled in the art, including simple substitutions or changes in form and detail, without departing from the spirit and scope of the application.

Claims

1. A make-up air structure for a fume hood, characterized in that, The air inlet channel is located at the back side of the fume exhaust cabinet, and the air inlet channel is provided with an air inlet. The adjustment channel is provided with an inlet and an outlet along the second direction, and the inlet of the adjustment channel is communicated with the outlet of the air inlet channel. The air outlet channel is provided with an air outlet, and the inlet of the air outlet channel is connected with the outlet of the adjustment channel and intersects with the first plane. The first plane and the side wall of the adjustment channel enclose an adjustment area, and the area of any cross section of the adjustment area in the first direction is greater than the area of the cross section of the outlet of the air inlet channel. Further comprising one or any combination of the following: a first aperture plate, a second aperture plate, and a third aperture plate; wherein, The first aperture plate extends along a third direction and is arranged in the adjustment channel, and the first direction, the second direction, and the third direction are at a set angle with respect to each other. The second aperture plate extends along the third direction and is arranged in the adjustment area. The third aperture plate is arranged at the air outlet and covers the air outlet. The first plane, the first aperture plate, and the side wall of the adjustment channel enclose the adjustment area.

2. The air supplementing structure according to claim 1, wherein The first aperture plate and the second aperture plate are perpendicular to the side wall of the adjustment channel, respectively.

3. The air supplementing structure according to claim 1, wherein Along the second direction, the projection of the first aperture plate covers the projection of the inlet of the adjustment channel.

4. The air supplementing structure according to claim 1, wherein The first direction, the second direction, and the third direction are perpendicular to each other.

5. The air supplementing structure according to claim 1, wherein The area of the cross section of the outlet of the air inlet channel is S1, and the area of any cross section of the adjustment area is S2, and 0.04≤S1 / S2≤0.

06.

6. The air supplementing structure according to claim 1, wherein The outside air flows through the air inlet, the adjusting channel and the air outlet channel in sequence, and is uniformly sent out through the air outlet, wherein the uniform sending is defined as follows: (V max -V av ) / V av ≤30%, or (V av -V min ) / V av ≤30%, wherein V max is the maximum value of the air speed measured at the air outlet, V av is the average value of the air speed measured at the air outlet, and V min is the minimum value of the air speed measured at the air outlet.

7. The air supplementing structure according to claim 1, wherein The surface where the inlet of the adjustment channel is located is a second plane, and along the second direction, the distance between the first aperture plate and the second plane is L1, and 0mm≤L1≤100mm.

8. The air supplementing structure according to claim 1, wherein Along the second direction, the distance between the second aperture plate and the first plane is L2, and 0mm≤L2≤100mm.

9. The air supplementing structure according to claim 1, wherein Along the first direction, the adjustment area is a constant cross-section body.

10. The air supplementing structure according to claim 1, wherein Along the first direction, the adjustment channel is a constant cross-section body.

11. The air supplementing structure according to claim 1, wherein The air inlet channel is a constant cross-section body.

12. The air supplementing structure according to claim 1, wherein The air inlet channel includes a first air inlet channel and a second air inlet channel arranged at intervals along the third direction, and the first air inlet channel and the second air inlet channel extend along the first direction, respectively.

13. The air supplementing structure according to claim 1, wherein The first air inlet channel and the second air inlet channel are constant cross-section bodies.

14. The air supplementing structure according to claim 13, wherein The area of the cross section of the first air inlet channel and the area of the cross section of the second air inlet channel are equal.

15. The air supplementing structure according to claim 14, wherein Further comprising an extension channel, and the air inlet is arranged in the extension channel, and the extension channel is communicated with the first air inlet channel and the second air inlet channel, respectively.

16. The air supplementing structure according to claim 13, wherein The extension channel is parallel to the adjustment channel and is arranged at intervals along the first direction with respect to the adjustment channel.

17. The air supplementing structure according to claim 16, wherein The extension channel includes a first part, a second part, and a third part communicated in sequence, the first part is communicated with the first air inlet channel, the air inlet is arranged in the second part, and the third part is communicated with the second air inlet channel.

18. The air supplementing structure according to claim 16, wherein The opening rate of the first aperture plate, the third aperture plate, and the second aperture plate is 30% to 80%.

19. The air supplementing structure according to claim 1, wherein Further comprising:

20. The air supplementing structure according to any one of claims 1 to 19, wherein ​ A transition passage, an inlet of the transition passage is connected with an outlet of the air inlet passage, an outlet of the transition passage is connected with an inlet of the adjustment passage, an area of a cross section of the outlet of the transition passage is greater than an area of a cross section of the inlet of the transition passage.

21. The air supplementing structure according to claim 20, wherein Along the third direction, the inlet of the adjustment passage comprises a first inlet and a second inlet arranged at intervals, the transition passage comprises a first transition passage and a second transition passage arranged at intervals, the outlet of the air inlet passage comprises a first outlet and a second outlet arranged at intervals, the first transition passage is connected with the first outlet and the first inlet respectively, and the second transition passage is connected with the second outlet and the second inlet respectively.

22. The air supplementing structure according to claim 1, wherein Along the first direction, the air outlet is higher than the adjustment passage, the air outlet extends along the third direction and is arranged towards the air inlet passage, along the third direction, a size of the air outlet, a size of the inlet of the air outlet passage and a size of the outlet of the adjustment passage are equal.

23. A fume hood, characterized in that, Comprise: A cabinet body having an inner cavity, the inner cavity constitutes a working cavity; The air supply structure of any one of claims 1 to 22, along the second direction, the working cavity is located between the air inlet passage and the air outlet, the air outlet is arranged below the cabinet body, and the air outlet is arranged towards the inner cavity to supply air into the working cavity.

24. The fume hood of claim 23, wherein, Along the first direction, the adjustment passage is located at a bottom of the cabinet body, and the air inlet is located at a top of the cabinet body.

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