A fume hood

Abstract

The application discloses a ventilation cabinet, comprising a cabinet body, a make-up air system, an upper make-up air module, and an upper outer make-up air outlet arranged towards a partition passage on the top side of an inner cavity, wherein the upper outer make-up air outlet is not arranged to make up air from outside a window. The application can improve the air flow organization of the inner cavity and prevent leakage of pollutants of the ventilation cabinet.

Description

[0001] This application is a divisional application of the invention patent application entitled "A Fume Hood", with parent application number 202210690117.1 and application date of June 17, 2022. Technical Field

[0002] This invention relates to the field of ventilation technology, and in particular to a fume hood. Background Technology

[0003] Ventilation equipment can generally be described as equipment that removes exhaust gases, harmful gases, and particulate matter from a workspace to the outside (usually outdoors). This type of equipment has a wide range of applications in industry and daily life. For example, in factories that produce toxic or harmful gases or particulate matter during industrial production, in biological and chemical laboratories of research institutions, and in kitchens that produce fumes during cooking, ventilation equipment is needed to isolate toxic gases and particulate matter in a certain workspace from the users, prevent the users from inhaling toxic or harmful gases and particulate matter, and exhaust toxic or harmful gases and particulate matter outdoors.

[0004] Fume hoods are essential equipment for controlling contaminants in laboratories. Their function is to control contaminants emitted from inside the hood and ensure their proper discharge to the outside, preventing them from escaping into the room through the fume hood's openings and endangering the health and safety of laboratory personnel.

[0005] However, existing fume hoods have a problem with pollutant spillage. Summary of the Invention

[0006] The purpose of this invention is to solve the technical problem of pollutant overflow in fume hoods. This invention provides a fume hood that, by incorporating an upper external air supply module with an upper external air supply inlet, supplies air to the obstruction channel, cleaning and diluting pollutants inside the viewing window, accelerating the air intake speed through the top bypass, preventing pollutants from overflowing through the bypass, and eliminating the accumulation of inertial flow inside the viewing window.

[0007] To address the aforementioned technical problems, embodiments of the present invention disclose a fume hood, comprising: a cabinet body having an inner cavity, the inner cavity constituting a working chamber, and a front opening formed on the front side of the inner cavity to open to the indoor environment; a makeup air system for supplying air to the fume hood; and an upper makeup air module disposed on the top side of the inner cavity and connected to the makeup air system, the upper makeup air module including an upper external makeup air inlet, the upper external makeup air inlet being disposed facing a partition channel on the top side of the inner cavity, and the upper external makeup air inlet not supplying air from outside the viewing window.

[0008] By adopting the above technical solution, the air supply from the upper external air inlet can clean and dilute pollutants inside the window, accelerate the air intake speed of the top bypass (i.e., the isolation channel), prevent pollutants from overflowing through the bypass, eliminate the accumulation of inertial flow inside the window, and improve the safety of users using the fume hood.

[0009] In addition, the airflow (air curtain or air curtain) provided by the upper external air supply vent to the partition channel does not affect the face wind speed. While preventing pollutants from overflowing through the bypass, it also allows pollutants emitted from inside the cabinet to be smoothly discharged to the outside, instead of escaping into the room through the fume hood's operating opening and endangering the health and safety of laboratory personnel.

[0010] According to another specific embodiment of the present invention, it further includes: a partition member, which is disposed at the front opening and located on the top side of the inner cavity, and is spaced apart from the bottom side of the inner cavity along the height direction of the cabinet; a viewing window, which is disposed on the outside of the partition member and is movable upward or downward along the height direction, and is spaced apart from the partition member along the depth direction of the cabinet to form a partition channel, the partition channel communicating with the inner cavity; and an upper external air supply vent facing the partition channel.

[0011] According to another specific embodiment of the present invention, the upper air supply module includes: the upper air supply module includes: an upper air supply box, the upper air supply box having an upper air supply cavity and an air inlet communicating with the upper air supply cavity, the upper air supply cavity being provided with a perforated plate, outside air entering the upper air supply cavity through the air inlet, passing through the perforated plate and flowing out of the upper air supply box through the upper external air supply port.

[0012] According to another specific embodiment of the present invention, the upper supplementary air chamber includes a first upper supplementary air chamber and a second upper supplementary air chamber, the air inlet is connected to the first upper supplementary air chamber, and the upper external supplementary air outlet is connected to the second upper supplementary air chamber; the perforated plate includes a guide plate, the guide plate is located between the first upper supplementary air chamber and the second upper supplementary air chamber; outside air enters the first upper supplementary air chamber through the air inlet, enters the second upper supplementary air chamber after passing through the guide plate, and flows out of the upper supplementary air chamber through the upper external supplementary air outlet.

[0013] According to another specific embodiment of the present invention, the housing includes a top plate, an arc-shaped plate, a connecting plate, and a bottom plate. The arc-shaped plate faces the inner cavity, the connecting plate extends along the height direction and faces away from the inner cavity, and the upper external air intake is disposed on the bottom plate.

[0014] Along the height direction, the air inlet is located on the top plate, and the second upper air supply cavity is located below the first upper air supply cavity;

[0015] The guide plate includes a first inclined section, which is inclined upward and connected to the connecting plate. The first inclined section is provided with multiple air filter holes.

[0016] According to another specific embodiment of the present invention, along the height direction, the first inclined section is offset from the air inlet, and the first inclined section is opposite to the upper external air supply inlet.

[0017] According to another specific embodiment of the present invention, it further includes a lower section guide plate, a middle section guide plate and an upper section guide plate arranged along the height direction, wherein the lower section guide plate, the middle section guide plate and the upper section guide plate are spaced apart from the rear inner lining plate of the inner cavity to form an exhaust channel, and the exhaust channel is connected to the exhaust system;

[0018] The lower section guide plate is provided with a lower exhaust area, and the middle section guide plate is provided with a middle exhaust area;

[0019] The upper guide plate includes an extension section along the depth direction of the cabinet. The extension section and the middle guide plate are spaced apart to form a rotating channel. The rotating channel extends along the height direction and is connected to the exhaust channel.

[0020] According to another specific embodiment of the present invention, at least 80% of the make-up air volume from the upper external air inlet enters the exhaust air channel from the rotary channel.

[0021] According to another specific embodiment of the present invention, the height from the upper external air inlet to the bottom side of the inner cavity is between 750mm and 1600mm.

[0022] According to another specific embodiment of the present invention, the wind speed of the upper external air supply port is between 0.3 m / s and 1.5 m / s.

[0023] According to another specific embodiment of the present invention, the upper external air supply port extends along the left and right width direction of the working cavity. Attached Figure Description

[0024] Figure 1 A front view of a fume hood according to an embodiment of the present invention is shown. Figure 1 ;

[0025] Figure 2 A side view of a fume hood according to an embodiment of the present invention is shown. Figure 1 ;

[0026] Figure 3 A cross-sectional view of a fume hood according to an embodiment of the present invention is shown. Figure 1 ;

[0027] Figure 4 A cross-sectional view of a fume hood according to an embodiment of the present invention is shown. Figure 2 ;

[0028] Figure 5 A side view of a fume hood according to an embodiment of the present invention is shown. Figure 2 ;

[0029] Figure 6 This invention illustrates a three-dimensional view of the air supply module in a fume hood according to an embodiment of the present invention. Figure 1 ;

[0030] Figure 7 A cross-sectional view of the upper air supply module in a fume hood according to an embodiment of the present invention is shown;

[0031] Figure 8 A side view of the upper air supply module in the fume hood according to an embodiment of the present invention is shown;

[0032] Figure 9 This invention illustrates a three-dimensional view of the air supply module in a fume hood according to an embodiment of the present invention. Figure 2 ;

[0033] Figure 10 A perspective view of the make-up air channel and the raised block in the fume hood according to an embodiment of the present invention is shown;

[0034] Figure 11 This invention illustrates a three-dimensional view of the air supply module in a fume hood according to an embodiment of the present invention. Figure 3 ;

[0035] Figure 12 A top view of a fume hood according to an embodiment of the present invention is shown. Figure 1 ;

[0036] Figure 13 yes Figure 12 Enlarged view of section A;

[0037] Figure 14 This invention illustrates a three-dimensional view of the air supply module in a fume hood according to an embodiment of the present invention. Figure 4 ;

[0038] Figure 15 A top view of a fume hood according to an embodiment of the present invention is shown. Figure 2 ;

[0039] Figure 16 yes Figure 15 Enlarged view of section B;

[0040] Figure 17 A side view of the baffle plate in the fume hood according to an embodiment of the present invention is shown;

[0041] Figure 18 A schematic diagram of airflow organization within a fume hood according to an embodiment of the present invention is shown. Detailed Implementation

[0042] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0043] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0044] In the description of this 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 accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0045] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0046] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0047] 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.

[0048] refer to Figures 1 to 5 This application provides a fume hood 1, including a cabinet body 10. The cabinet body 10 has a top inner lining panel 101, a bottom inner lining panel 102, a rear inner lining panel 103, and a left inner lining panel 105 (see...). Figure 17), right inner lining plate 104. The top inner lining plate 101 and the bottom inner lining plate 102 are along the height direction of the fume hood 1 ( Figures 1 to 5 The left inner lining plate 105 and the right inner lining plate 104 are arranged opposite each other along the width direction of the fume hood 1 (as shown in the Z direction). Figure 1 The top inner lining plate 101 is positioned relative to the fume hood 1 in the X direction, and is positioned along the depth direction of the fume hood 1. Figures 2 to 4 (As shown in the Z-direction) is located on the rear side of the fume hood 1. The aforementioned top inner lining plate 101, bottom inner lining plate 102, rear inner lining plate 103, left inner lining plate 105, and right inner lining plate 104 enclose the inner cavity S of the cabinet body 10, which constitutes the working chamber of the fume hood 1. Figure 2 , Figure 3 and Figure 5 As shown in Figure S, a front opening 1a is formed on the front side of the inner cavity S (the side opposite to the rear inner lining plate 103 along the depth direction), which opens to the indoor environment. Exemplarily, the front opening 1a serves as an operating port.

[0049] For example, in this embodiment, a base cabinet 13 is provided below the cabinet body 10 (i.e. below the inner cavity S), which can be used to store reagents and materials required for experiments. Figure 1 The diagram shows that there are three base cabinets 13 below the cabinet 10, but the number of base cabinets 13 is not limited to this. The appropriate number of base cabinets 13 can be set according to the actual usage requirements.

[0050] When the fume hood 1 is placed in an indoor environment, the user faces the front opening 1a of the cabinet 10, where a partition 13 and a viewing window 14 are provided. (Reference) Figures 2 to 5 The partition 13 extends along the width of the cabinet 10 (see...). Figure 3 and Figure 4 Located on the top side of the inner cavity S (below the top inner lining plate 101), the partition 13 is spaced apart from the bottom side of the inner cavity S (e.g., the bottom inner lining plate 102) along the height direction of the cabinet 10. Figure 5 As shown, the partition 13 is inclined. In some possible embodiments, the partition 13 is erected vertically along its height. Exemplarily, the partition 13 is connected to the left inner liner 105 and the right inner liner 104 along its width. Exemplarily, the partition 13 is a partition glass.

[0051] The aforementioned viewing window 14 is located on the outside of the partition member 13. The viewing window 14 can move upward along the height direction of the cabinet 10 to open the front opening 1a, or the viewing window 14 can move downward along the height direction of the cabinet 10. That is, the viewing window 14 can move upward or downward relative to the partition member 13 along the height direction of the cabinet 10. In this embodiment, the viewing window 14 and the partition member 13 are spaced apart along the depth direction of the cabinet 10, forming a partition channel P1 (bypass), which communicates with the inner cavity S. The partition channel P1 extends along the width direction of the fume hood 1. Figure 3 and Figure 4 (As shown).

[0052] In some possible implementations, refer to Figure 3 and Figure 4 The fume hood 1 of this application also includes a lintel 141, which is located on the top outer side of the viewing window 14 of the cabinet 10. That is, along the depth direction, the viewing window 14 is located between the partition 13 and the lintel 141.

[0053] Continue to refer to Figures 2 to 5 The fume hood 1 of this application also includes a make-up air system 40 and an exhaust air system 50. The make-up air system 40 is used to supply air to the interior cavity S of the fume hood 1 (e.g., to each make-up air module, with the make-up air flow as shown in B). The exhaust air system 50 is used to exhaust air entering the working chamber through the front opening 1a. Figure 5 (As shown in Q1), the air enters the working chamber and the isolation channel P1 described later through the air supply system 40. Figure 5 The exhaust air (as shown in Q2, Q3, Q4, and Q5) is discharged from the working chamber (exhaust airflow as shown in P). Among them, Q4 comes from the side air supply module (e.g., the column), which will be described in detail later.

[0054] In this embodiment, the fume hood 1 further includes an upper air supply module 20 and a lower air supply module 30. The upper air supply module 20 is located on the top side of the inner cavity S (e.g., below the top inner lining plate 101) and communicates with the air supply system 40. The upper air supply module 20 includes an upper inner air supply port 21 and an upper outer air supply port 22. The upper inner air supply port 21 faces the working cavity and is located in the space between the rear inner lining plate 103 and the partition member 13. The upper outer air supply port 22 faces the partition channel P1, and exemplarily, the upper outer air supply port 22 is located within the partition channel P1. Exemplarily, the upper inner air supply port 21 and the upper outer air supply port 22 extend along the width direction of the fume hood 1.

[0055] For example, in the width direction, the upper inner air inlet 21 can deliver air obliquely downwards, horizontally, or vertically downwards into the working chamber. Figure 5(As shown in Q2 and Q6). This configuration creates a flow channel in the upper part of the inner cavity S, reducing eddies, pushing the eddies to the back of the cabinet 10, keeping them away from the user, accelerating the top drainage efficiency, shortening the residence time of pollutants, and reducing the high-density accumulation of pollutants.

[0056] This application provides an upper external air supply vent 22, which, in the width direction, can supply air to the partition channel P1. Figure 5 As shown in Q5, the fume hood 1 of this application does not have a makeup air structure outside the viewing window 14. The upper external makeup air inlet 22 does not provide makeup air from outside the viewing window 14, but rather from the partition channel P1 between the viewing window 14 and the partition 13. With this configuration, the makeup air from the upper external makeup air inlet 22 can clean and dilute pollutants inside the viewing window 14, accelerate the air intake speed of the top bypass (partition channel P1), prevent pollutants from overflowing through the bypass, eliminate the accumulation of inertial flow inside the viewing window 14, and improve the safety of users using the fume hood 1.

[0057] In some possible implementations, the height from the upper external air intake 22 to the bottom of the inner cavity S is between 750mm and 1600mm along the vertical direction. The air velocity of the upper external air intake 22 is between 0.3m / s and 1.5m / s. With this configuration, the airflow (air curtain or air curtain) provided by the upper external air intake 22 to the partition channel P1 does not affect the face velocity. While preventing pollutants from overflowing through the bypass, it also allows pollutants emitted from inside the cabinet to be smoothly discharged to the outside, rather than escaping into the room through the operating opening of the fume hood 1, thus protecting the health and safety of laboratory personnel.

[0058] The aforementioned lower air supply module 30 is located on the bottom side of the inner cavity S and communicates with the air supply system 40. Exemplarily, the lower air supply module 30 is spaced apart from the aforementioned partition channel P1 along the height direction. The lower air supply module 30 includes a lower air supply outlet 31, which extends along the width direction and is at least directed towards the working cavity. Exemplarily, the lower air supply outlet 31 can supply air obliquely upwards, horizontally, or vertically downwards towards the interior of the working cavity. Figure 5 shown in Q3).

[0059] refer to Figure 6 The air supply sources within the working chamber of this application include: an upper external air supply port 22, an upper internal air supply port 21, a lower air supply port 31, and a front opening 1a. For example, the air supply volume of the upper internal air supply port 21 accounts for 25%, the air supply volume of the upper external air supply port 22 accounts for 15%, and the air supply volume of the lower air supply port 31 accounts for 50%.

[0060] Because the upper inner air inlet 21, upper outer air inlet 22, and lower air inlet 31 extend along the left and right width of the working chamber, they can deliver air evenly, preventing the formation of turbulence. This reduces the risk of operators inhaling harmful substances. The air blown out by each air inlet forms an "air barrier," which can buffer the ambient air inside and outside the working chamber, effectively preventing the risk of overflow. At the same time, after setting up the above-mentioned air inlets, not only can the air volume supplied from the front opening 1a be reduced, thereby reducing air conditioning energy consumption, but also, because the setting of the upper inner air inlet 21 can establish a stable push-pull airflow pattern in the working chamber, the risk of air overflow in the working chamber is greatly reduced.

[0061] The structure of the upper air supply module 20 is described in detail below.

[0062] In some possible implementations, refer to Figures 7 to 9 The top air supply module 20 includes: a top air supply housing. For example, refer to... Figure 5 The upper air supply box is located between the partition 13 and the top inner liner 101 of the inner cavity S, with the partition 13 supporting the upper air supply box. However, this application is not limited to this; any installation method that allows the upper air supply box to be installed on the top inner liner 101 of the inner cavity S to supply air to the working chamber and the partition channel P1 is within the scope of protection of this application. For example, the upper air supply box can be connected to the left and right liners along its width.

[0063] The upper air supply box has upper air supply chambers (e.g., including the first upper air supply chamber S1, the second upper air supply chamber S2, and the third upper air supply chamber S3, described later) and upper air supply inlets 2011 communicating with the upper air supply chambers. The upper air supply chambers are provided with perforated plates (including the guide plate 205 and the upper air supply filter plate 206, described later). Outside air enters the upper air supply chamber through the upper air supply inlet 2011, and after passing through the perforated plate, it flows out of the upper air supply box through the upper inner air supply inlet 21 and the upper outer air supply inlet 22, respectively. That is, the upper air supply module 20 of this application is a box structure with upper air supply chambers. After outside air enters the upper air supply chamber through the upper air supply inlet 2011, the perforated plate stabilizes the airflow, making the outside air entering the upper inner air supply inlet 21 and exiting the upper outer air supply inlet 22 uniform.

[0064] In this application, Figure 7 and Figure 8 The diagram shows a single upper air supply cavity in the upper air supply box, extending in the width direction. In some possible embodiments, the upper air supply box may have multiple upper air supply cavities, such as two, three, four, etc.

[0065] like Figure 7 and Figure 9 As shown, the aforementioned upper air supply box and perforated plate (including the guide plate 205 and upper air supply filter plate 206 described later) extend in the width direction of the fume hood 1.

[0066] refer to Figure 7 and Figure 8 In this embodiment of the application, the upper supplementary air cavity includes a first upper supplementary air cavity S1, a second upper supplementary air cavity S2, and a third upper supplementary air cavity S3. That is, the upper supplementary air cavity includes three air cavities. Among them, the upper supplementary air inlet 2011 is provided in the first upper supplementary air cavity S1 and communicates with the first upper supplementary air cavity S1; the upper inner supplementary air inlet 21 is provided in the second upper supplementary air cavity S2 and communicates with the second upper supplementary air cavity S2; the upper outer supplementary air inlet 22 is provided in the third upper supplementary air cavity S3 and communicates with the third upper supplementary air cavity S3. Along the height direction ( Figure 8 (As shown in the Z direction), the second upper air supply cavity S2 is located between the first upper air supply cavity S1 and the third upper air supply cavity S3, and the first upper air supply cavity S1, the second upper air supply cavity S2 and the third upper air supply cavity S3 are connected.

[0067] The perforated plate includes a guide plate 205 and an upper supplementary air filter plate 206. The guide plate 205 has a plurality of first air filter holes 20531 distributed along the width direction, and the upper supplementary air filter plate 206 has a plurality of second air filter holes 2061 distributed along the width direction. Along the height direction, the guide plate 205 is located between the first upper supplementary air cavity S1 and the second upper supplementary air cavity S2. Outside air enters the first upper supplementary air cavity S1 through the upper supplementary air inlet 2011, and the upper supplementary air filter plate 206 is located between the second upper supplementary air cavity S2 and the third upper supplementary air cavity S3. In other words, the guide plate 205 and the upper supplementary air filter plate 206 divide the upper supplementary air cavity into the first upper supplementary air cavity S1, the second upper supplementary air cavity S2, and the third upper supplementary air cavity S3.

[0068] Outside air from the make-up air system 40 enters the first make-up air chamber S1 through the make-up air inlet 2011, flows along the guide plate 205 and passes through the first filter hole 20531 on the guide plate 205 to reach the second make-up air. In the first make-up air chamber S1, the air velocity decreases and the dynamic pressure is converted into static pressure, which plays a stabilizing role. Under the action of static pressure, the air volume passes through the filter hole on the guide plate 205 uniformly, and the air coming out of the filter hole on the guide plate 205 has achieved uniform air velocity in the width direction.

[0069] After the airflow reaches the second upper supplementary air chamber S2, most of the airflow is discharged from the upper inner air outlet and enters the working chamber, while a small portion of the airflow passes through the second filter hole 2061 on the upper supplementary air filter plate 206 to reach the third upper supplementary air chamber S3. That is, the airflow from the second upper supplementary air chamber S2 is greater than the airflow from the third upper supplementary air chamber S3. In other words, the airflow from the upper outer air outlet is less than the airflow from the upper inner air outlet. This arrangement does not affect the face velocity. For example, the density of the perforations on the upper supplementary air filter plate 206 can be used to determine the airflow passing through the upper supplementary air filter plate 206. In some possible embodiments, the opening area of ​​the upper inner air outlet is 1.5 to 4 times the opening area of ​​the upper outer air outlet.

[0070] The air volume reaching the third upper air supply chamber S3 is discharged from the upper air outlet and enters the isolation channel P1.

[0071] In some possible implementations, the upper supplementary air cavity is not limited to three air cavities; it can have more air cavities, such as four, or fewer air cavities, such as two. In some possible implementations, the upper supplementary air cavity includes a first upper supplementary air cavity S1 and a second upper supplementary air cavity S2, for example, […]. Figure 8 The upper air supply filter plate 206 is removed, and the original second and third air cavities are merged into one air cavity. The upper inner air supply port 21 and the upper outer air supply port 22 are both located in the second upper air supply cavity S2 and are respectively connected to the second upper air supply cavity S2.

[0072] Thus, the orifice plate includes a guide plate 205, which is located between the first upper air supply cavity S1 and the second upper air supply cavity S2. Outside air enters the first upper air supply cavity S1 through the upper air supply inlet 2011, passes through the guide plate 205, enters the second upper air supply cavity S2, and flows out of the upper air supply box through the upper inner air supply inlet 21 and the upper outer air supply inlet 22, respectively.

[0073] The embodiments in this application are illustrated using three air cavities as an example.

[0074] In some possible implementations, one or more of the first upper air supply cavity S1, the second upper air supply cavity S2, or the third upper air supply cavity S3 may be formed by multiple sub-cavities.

[0075] Continue to refer to Figures 7 to 9 The upper air supply box of this application includes a top plate 201, an arc plate 202, a connecting plate 204 and a bottom plate 203. The arc plate 202 is set facing the inner cavity S, and the connecting plate 204 extends along the height direction and is set away from the inner cavity S. The upper inner air supply port 21 is set on the arc plate 202, and the upper outer air supply port 22 is set on the bottom plate 203. Along the height direction, the upper air supply inlet 2011 is set on the top plate 201, and the second upper air supply cavity S2 is located below the first upper air supply cavity S1.

[0076] like Figure 7 and Figure 8 As shown, the guide plate 205 extends along the width direction to connect with the end plate 208 of the housing to form a first upper air supply cavity S1 with the top plate 201, the arc plate 202 and the connecting plate 204. The upper air supply filter plate 206 extends along the width direction to connect with the end plate 208 of the housing to form a second upper air supply cavity S2 with the guide plate 205, the arc plate 202, the bottom plate 203 and the connecting plate 204. The upper air supply filter plate 206 extends along the width direction to connect with the end plate 208 of the housing to form a third upper air supply cavity S3 with the extension channel 207.

[0077] In some possible implementations, the aforementioned guide plate 205 includes a first inclined section 2053, which is inclined upward and connected to the connecting plate 204. The first inclined section 2053 is provided with a plurality of first air filter holes 20531. The first air filter holes 20531 of the guide plate 205 are located on the first inclined section 2053, which can prevent air from blowing directly onto the first air filter holes 20531. After the air flows out from the first air filter hole 20531 plate on the first inclined section 2053, it is swept onto the connecting plate 204, which plays a role in stabilizing the flow.

[0078] The aforementioned base plate 203 also has a downwardly protruding extension channel 207. The inner cavity S of the extension channel 207 forms a third upper air supply cavity S3, which communicates with the second upper air supply cavity S2. The end of the extension channel 207 is provided with an upper air outlet. For example, the extension channel 207 is located within the aforementioned partition channel P1, which can fully clean and dilute pollutants inside the viewing window 14, accelerate the top bypass air intake speed, prevent pollutants from overflowing through the bypass, eliminate the accumulation of inertial flow inside the viewing window 14, and also make the structure of the fume hood 1 compact.

[0079] For example, along the height direction, the first inclined section 2053 is staggered from the upper air inlet 2011, and the first inclined section 2053 is opposite to the upper external air inlet 22. That is, the upper air inlet 2011 is not directly facing the first inclined section 2053, which can prevent the air from blowing directly onto the first filter holes 20531 on the first inclined section 2053, thus making the air outlet uniform. At the same time, along the height direction, the multiple first filter holes 20531 of the first inclined section 2053, the upper air filter plate 206, and the upper external air outlet correspond one-to-one. Under static pressure, the air coming out of the second filter holes 2061 on the upper air filter plate 206 has achieved uniform wind speed in the width direction, and then the wind speed blown from the upper external air outlet to the partition channel P1 is uniform, without affecting the face wind speed. It can also play a role in adjusting the air volume of the upper external air outlet.

[0080] For example, the top air intake 2011 is located at one end of the top plate 201 near the inner cavity S. For example, Figure 8As shown, the upper air supply inlet 2011 is located on the left side of the upper air supply box, and the first inclined section 2053 is located on the right side of the upper air supply box. With this arrangement, after the outside air enters the first upper air supply cavity S1 through the upper air supply inlet 2011, it will flow along the depth direction and flow to the first air filter hole 20531 on the first inclined section 2053, which prolongs the flow distance of the outside air in the first upper air supply cavity S1, which is beneficial to the uniformity of the air output from the first air filter hole 20531.

[0081] For example, the guide vane 205 further includes a straight section 2052, which is connected to the end of the first inclined section 2053 that is not connected to the connecting plate 204, and the straight section 2052 and the first inclined section 2053 form an obtuse angle. Figure 8 (Supplementary angle of α) setting. For example, the straight section 2052 of the guide vane 205 is parallel to the top plate 201.

[0082] In some possible implementations, the angle between the extension of the straight section 2052 and the extension of the first inclined section 2053 is α, where 20°≤α≤80°. Within this parameter range, the airflow from the first filter hole 20531 can be made uniform.

[0083] In some possible implementations, refer to Figure 8 The intersection of the extension of straight segment 2052 and the extension of the first inclined segment 2053 ( Figure 8 The distance from the connecting plate 204 to the filter (as shown in Figure O) is W, where 30mm ≤ W ≤ 150mm. This setting ensures uniform airflow from the first filter hole 20531.

[0084] In some possible implementations, the guide vane 205 further includes a second inclined section 2051, which is inclined upwards and connected to the arc-shaped plate 202. The two ends of the straight section 2052 are respectively connected to the first inclined section 2053 and the second inclined section 2051. Exemplarily, along the height direction, the upper air intake 2011 is located above the second inclined section 2051. With this configuration, outside air enters the first upper air intake cavity S1 from the upper air intake 2011 and flows down the slope of the second inclined section 2051, reducing resistance loss and facilitating airflow towards the first inclined section 2053.

[0085] In some possible implementations, one end of the upper air supply filter plate 206 is connected to the connecting plate 204, and the other end is connected to the base plate 203. The upper air supply filter plate 206 overlaps the base plate 203 and is perpendicular to the connecting plate 204. The extension channel 207 extends downward from the connection points of the upper air supply filter plate 206 and the connecting plate 204 with the upper air supply filter plate 206, and one side wall of the extension channel 207 ( Figure 8 The right side wall of the extended channel 207 shown is on the same plane as the connecting plate 204. Figure 8As shown, the left side wall of the extension channel 207 is connected to the base plate 203 and extends downward. Exemplarily, the extension channel 207 is in the shape of an inverted trapezoid. This facilitates the insertion of the extension channel 207 into the partition channel P1.

[0086] It should be noted that the structure of the upper air supply box in this application is not limited to... Figure 8 The structure shown, including the upper air inlet 2011, the upper air cavity, the upper external air inlet 22, and the upper internal air inlet 21, is within the protection scope of this application.

[0087] refer to Figure 7 and Figure 9 In this embodiment of the application, the upper air intake 2011 is a narrow slot, and the upper air intake 2011 includes one or more. Figure 9 The diagram shows two upper air intake vents 2011. In some possible implementations, the number of upper air intake vents 2011 may be greater, as long as they are sufficient to supply outside air to the upper air intake cavity.

[0088] refer to Figures 2 to 6 as well as Figure 9 The make-up air system 40 of this application includes a make-up air duct 41 located at the top of the cabinet 10. The top of the make-up air duct 41 is provided with a make-up air inlet 411, and the bottom of the make-up air duct 41 is provided with a make-up air outlet 412 (see [link]). Figure 10 The top inner liner 101 of the inner cavity S is provided with a first air passage 1012. The top inner liner 101 is located between the make-up air passage 41 and the upper make-up air box. The make-up air outlet 412, the first air passage 1012 and the upper make-up air inlet 2011 are connected. That is to say, the make-up air enters the make-up air passage 41 from the make-up air inlet 411, flows through the make-up air outlet 412 at the bottom of the make-up air passage 41, the first air passage 1012 on the top inner liner 101, the upper make-up air inlet 2011, and enters the upper make-up air chamber of the upper make-up air module 20.

[0089] In some possible implementations, refer to Figure 5 and Figure 9 The fume hood 1 also includes a raised block 1011. Along the height direction, the raised block 1011 is located between the make-up air channel 41 and the top inner liner 101. The make-up air channel 41 and the top inner liner 101 are spaced apart and form a cable passage (for cables to pass through). The raised block 1011 has a second air passage 10111, which connects the make-up air outlet, the first air passage 1012, the second air passage 10111, and the upper make-up air inlet 2011. Make-up air enters the upper make-up air module 20 from the make-up air outlet 412 at the bottom of the make-up air channel 41, through the raised block 1011 and the top inner liner 101. The raised block 1011 is in contact with the make-up air channel 41 and the top inner liner 101 on the top or bottom, and the contact surface is covered with sealing foam.

[0090] Because of the raised block 1011, the air supply channel 41 will not come into large contact with the top inner lining plate 101, and will not press on the cables used by the fume hood 1, making it convenient to change the corresponding cables when maintaining the equipment.

[0091] refer to Figure 9 and Figure 10 The aforementioned make-up air outlet 412, first air passage 1012, second air passage 10111, and upper make-up air inlet 2011 are all elongated slots. The make-up air outlet 412, first air passage 1012, second air passage 10111, and upper make-up air inlet 2011 include one or more, and correspond one to one. Figure 9 and Figure 10 As shown, there are two supply air outlets 412, one first air passage 1012, one second air passage 10111, and one upper supply air inlet 2011. In the height direction, each supply air outlet 412, the first air passage 1012, the second air passage 10111, and the upper supply air inlet 2011 correspond one-to-one, which forms two independent supply air paths that do not interfere with each other.

[0092] refer to Figures 2 to 6 , Figure 9 The make-up air system 40 of this application also includes an air inlet channel 42, which is connected to the make-up air channel 41. The air inlet channel 42 extends along the height direction and is located on the rear side of the cabinet 10. Along the depth direction of the cabinet 10, the working chamber is located between the air inlet channel 42 and the lower make-up air port 31. The adjustment channel 43 extends along the depth direction of the cabinet 10. Along the depth direction, the adjustment channel 43 has an inlet and an outlet. The inlet of the adjustment channel 43 is connected to the outlet of the air inlet channel 42. The upper make-up air module 20 includes an air outlet channel. The lower make-up air port 31 is provided on the air outlet channel. The inlet of the air outlet channel is connected to the outlet of the adjustment channel 43.

[0093] For example, the outside air coming down from the air inlet channel 42 enters the adjustment channel 43, which is equivalent to entering a large space from a small space. After the outside air passes through the perforated plate in the adjustment channel 43, the influence of the jet on the uneven flow field is reduced, and part of the dynamic pressure is converted into static pressure, reducing the speed of the outside air. Finally, the air velocity at the air outlet is uniform, so that air can be evenly delivered to the working chamber of the fume hood 1 from the lower air supply port 31, which plays a role in stabilizing pressure and reducing noise.

[0094] For example, the air inlet channel 42 includes a first air inlet channel 42 and a second air inlet channel 42 that are spaced apart along the width direction, and the two air inlet channels 42 extend along the height respectively.

[0095] For example, the make-up air channel 41 includes a first part 412, a second part 413, and a third part 414 connected in sequence. The first part 412 is connected to one of the air inlet channels 42, the make-up air inlet 411 is located in the second part 413, and the third part 414 is connected to the other air inlet channel 42. For example, the first part 412 and the third part 414 of the make-up air channel 41 extend along the depth direction, and the second part 412 of the extension channel 207 extends along the width direction.

[0096] In fluid mechanics, fluids possess the property of "viscosity." When a fluid flows through a pipe, its velocity is highest in the middle and lowest near the inner wall. This is because friction exists between the fluid and the pipe wall, known as viscous force, which hinders flow.

[0097] The flow rate is slowest and the capture capacity is weakest on the inner walls of the left and right sides of the cabinet (i.e., the left inner liner 105 and the right inner liner 104). These are often the locations where pollutants escape.

[0098] Therefore, refer to Figure 6 and Figure 11 The fume hood 1 of this application further includes a side air supply module, comprising a side air outlet disposed on the rear side facing the inner cavity S, and the side air supply module is connected to the air supply system 40. The side air supply module blows air towards the rear side facing the inner cavity S (e.g., the guide plate 205 described later), accelerating the flow, i.e., increasing the flow velocity on the inner wall surface, eliminating inertia or backflow, and enhancing the ability to capture pollutants on the inner wall. Thus, this application adds an active air supply structure at the inner wall, reducing the risk of pollutant leakage.

[0099] In other words, for reference Figure 5 and Figure 6 The sources of make-up air in the working chamber of this application include: upper external make-up air inlet 22 (Q2), upper internal make-up air inlet 21 (Q2), lower make-up air inlet 31 (Q3), front opening 1a (Q1) and side air outlet (Q4).

[0100] For example, the lower air supply module 30 and / or the upper air supply module 20 are connected to the side air supply module to provide air supply airflow to the air cavity of the side air supply module. That is, the lower air supply module 30 described in the above embodiments provides air supply airflow to the air cavity of the side air supply module, or the upper air supply module 20 described in the above embodiments provides air supply airflow to the air cavity of the side air supply module, or both the lower air supply module 30 and the upper air supply module 20 described in the above embodiments provide air supply airflow to the air cavity of the side air supply module simultaneously.

[0101] The specific structure of the side air supply module is described in detail below.

[0102] refer to Figure 1 , Figure 6 and Figure 17The fume hood 1 in this embodiment further includes a left column 11 and a right column 12. Along the width direction of the fume hood 1, the lower air supply module 30 is located between the left column 11 and the right column 12. Along the depth direction, the left column 11 is located in front of the left inner liner 105, and the right column 12 is located in front of the right inner liner 104. That is, the left inner liner 105 is installed on the side of the left column 11 facing the rear of the inner cavity S, and the right inner liner 104 is installed on the side of the right column 12 facing the rear of the inner cavity S.

[0103] refer to Figures 11 to 13 The right column 12 includes a right column first air inlet 1211 and a right column supplementary air cavity extending along the height direction. The part of the right column 12 facing the inner cavity S is provided with a right column air outlet. The right column supplementary air cavity is connected to the supplementary air system 40 through the right column air outlet, and the right column air outlet is connected to the right column supplementary air cavity.

[0104] The aforementioned side air supply module includes a left column air supply cavity, a left column air outlet, and a left column first air inlet.

[0105] For example, the structure of the left column 11 is the same as that of the right column 12. The part of the left column 11 facing the inner cavity S is provided with a left column air outlet, and the left column air supply cavity is connected to the air supply system 40 through the left column air outlet. The left column air outlet is connected to the left column air supply cavity.

[0106] The aforementioned side air supply module includes a right column air supply cavity, a right column air outlet, and a right column first air inlet 1211.

[0107] That is, in this embodiment of the application, side air supply modules are formed by the left column 11 and the right column 12 respectively. In some possible implementations, the side air supply module may be formed by the left column 11, or the side air supply module may be formed by the right column 12 respectively. This embodiment of the application illustrates the example of side air supply modules being formed by both the left column 11 and the right column 12.

[0108] refer to Figure 13 The right column 12 also includes a right column side air supply filter plate 1224 extending along the height direction. The right column side air supply filter plate 1224 divides the right column air supply cavity into a right column front air supply cavity 122 and a right column rear air supply cavity 121. The right column air outlet is connected to the right column front air supply cavity 122, and the right column first air inlet 1211 is connected to the right column rear air supply cavity 121.

[0109] Correspondingly, the left column 11 also includes a left column side air supply filter plate extending along the height direction. The left column side air supply filter plate divides the left column air supply cavity into a left column front air supply cavity and a left column rear air supply cavity. The left column air outlet is connected to the left column front air supply cavity, and the left column first air inlet is connected to the left column rear air supply cavity.

[0110] like Figure 11 and Figure 13 As shown, along the width direction, the lower air supply module 30 has a left lower air supply outlet and a right lower air supply outlet 301 on both sides; the left column first air inlet is located on the side of the left column 11 facing the lower air supply module 30, and the left lower air supply outlet is connected to the left column first air inlet; the right column first air inlet 1211 is located on the side of the right column 12 facing the lower air supply module 30, and the right lower air supply outlet 301 is connected to the right column first air inlet 1211. That is, the lower air supply module 30 provides air supply to the left column rear air supply cavity and the right column rear air supply cavity 121.

[0111] Since the lower air supply module 30 supplies air from the rear of the fume hood 1, it can provide a portion of the air volume from the air supply system 40 to the left column 11 and the right column 12 to form side air supply. This eliminates the need for additional air supply systems 40, saves on parts, and has a compact structure, making full use of the existing air supply system 40 for side air supply.

[0112] and, Figure 11 As shown, the air supply channel 41 provides outside air to the adjustment chamber 431 of the adjustment channel 43 through the air supply inlet 411. The air supplied by the adjustment chamber 431 to the downward air supply module 30 is uniform, thus the air supply flow from the downward air supply module 30 to the left and right column rear air supply chambers 121 is also uniform, and consequently the air outlets of the left and right columns are also uniform. This accelerates the flow velocity on the inner wall surface, eliminates inertia or backflow, and enhances the ability to capture pollutants on the inner wall. Therefore, by combining the downward air supply module 30 with the side air supply modules formed by the left and right columns 11 and 12, a "1+1>2" effect is produced.

[0113] Continue to refer to Figure 13 The right column 12 includes columns along the width direction ( Figure 13 The first arm 1221, the second arm 1222, and the third arm 1223 are arranged at intervals in the X direction. The first arm 1221 and the second arm 1222 of the right column 12 clamp the right column air outlet plate 1225. The right column air outlet plate 1225 has multiple right column air outlets along the height direction. The first arm 1221, the second arm 1222, the right column air outlet plate 1225, and the right column side air supply filter plate 1224 form the right column front air supply cavity 122. The second arm 1222 and the third arm 1223 of the right column 12 clamp the left inner lining plate 105.

[0114] The left column 11 includes a first arm, a second arm, and a third arm. The first and second arms of the left column 11 clamp the left column air outlet plate. The left column air outlet plate has multiple left column air outlets along the height direction. The first arm, the second arm, the left column air outlet plate, and the left column side air supply filter plate form the left column front air supply cavity. The second and third arms of the left column 11 clamp the left inner liner plate 105.

[0115] This configuration makes the structure of the fume hood 1 compact. While using the left column 11 and the right column 12 to hold the lower air supply module 30, the left inner liner plate 105 and the right inner liner plate 104, it also forms the air supply cavity in front of the left column and the air supply cavity in front of the right column 122, so as to make air supply inward along the left inner liner plate 105 and the right inner liner plate 104.

[0116] Air enters the first air inlet 1211 of the right column from the lower right air supply outlet 301 and then reaches the rear air supply cavity 121 of the right column. Within the rear air supply cavity 121, the air velocity decreases, and the dynamic pressure is converted into static pressure, thus stabilizing the pressure. Under static pressure, the airflow passes evenly through the side air supply filter plate 1224 of the right column, achieving uniform air velocity in the width direction. The air then enters the front air supply cavity 122 of the right column from the side air supply filter plate 1224 and is discharged from the right column air outlet plate 1225. The right column air outlet plate 1225 prevents foreign objects from entering the air cavity and further evens the airflow. The airflow discharged from the right column air outlet plate 1225 accelerates the flow velocity on the inner wall surface, eliminating inertia or backflow.

[0117] Similarly, air enters the first air inlet of the left column from the lower left air supply outlet and reaches the rear air supply chamber of the left column. Inside the rear air supply chamber, the air velocity decreases, and dynamic pressure is converted into static pressure, thus stabilizing the pressure. Under static pressure, the airflow passes evenly through the side air supply filter plate of the left column, achieving uniform air velocity in the width direction. The air then enters the front air supply chamber of the left column from the side air supply filter plate and is discharged from the left column air outlet plate. The left column air outlet plate prevents foreign objects from entering the air chamber and further evens out the airflow. The air discharged from the left column air outlet plate accelerates the flow velocity on the inner wall surface, eliminating inertia or backflow.

[0118] In some possible implementations, the volume of the front air supply cavity of the left column is smaller than the volume of the rear air supply cavity of the left column, and the volume of the front air supply cavity 122 of the right column is smaller than the volume of the rear air supply cavity 121 of the right column. For example, the volume of the rear air supply cavity of the left column is 1-8 times the volume of the front air supply cavity of the left column; the volume of the rear air supply cavity 121 of the right column is 1-8 times the volume of the rear air supply cavity 121 of the right column. This arrangement helps to stabilize the airflow, ensuring uniform airflow from the left column 11 and the right column 12.

[0119] Figure 11 and Figure 13 The illustration shows that the lower air supply module 30, as described in the above embodiment, provides supplementary airflow to the air cavities of the left column 11 and the right column 12.

[0120] In other embodiments, refer to Figures 14 to 16 The upper air supply module 20, as described in the above embodiment, provides supplementary airflow to the air cavity of the side air supply module. The left column 11 also includes a second air inlet on the left column, which is located above the first air inlet on the left column. The right column 12 also includes a second air inlet on the right column 1212, which is located above the first air inlet on the right column 1211.

[0121] refer to Figure 14 Along the width direction, the upper air supply module 20 has an upper left air supply outlet 2012 and an upper right air supply outlet on both sides; the second air inlet of the left column is located on the side of the left column 11 facing the upper air supply module 20, and the upper left air supply outlet 2012 is connected to the second air inlet of the left column; the second air inlet 1212 of the right column is located on the side of the right column 12 facing the upper air supply module 20, and the upper right air supply outlet is connected to the second air inlet 1212 of the right column. That is, the upper air supply module 20 provides air supply to the rear air supply chambers 121 of the left and right columns.

[0122] Since the upper air supply module 20 supplies air to the air supply channel 41, it can provide a portion of the air volume from the air supply channel 41 to the left column 11 and the right column 12 to form side air supply. There is no need to set up other air supply systems 40, which saves parts, has a compact structure, and makes full use of the existing air supply system 40 for side air supply.

[0123] and, Figure 8 As shown, the make-up air channel 41 supplies outside air to the upper make-up air module 20 through the make-up air inlet 411. The supplied air is uniform, thus the make-up airflow provided by the upper make-up air module 20 to the make-up air chambers 121 of the left and right columns is also uniform, and consequently the airflow from the air outlets of the left and right columns is also uniform. This accelerates the flow velocity on the inner wall surface, eliminates inertia or backflow, and enhances the ability to capture pollutants on the inner wall. Therefore, by combining the upper make-up air module 20 with the side make-up air modules formed by the left and right columns 11 and 12, a "1+1>2" effect is produced.

[0124] In some possible implementations, refer to Figures 2 to 5 as well as Figure 17The fume hood 1 of this application also includes a lower guide plate 52, a middle guide plate 53 and an upper guide plate 54 arranged along the height direction. The lower guide plate 52, the middle guide plate 53 and the upper guide plate 54 are spaced apart from the rear inner lining plate 103 of the inner cavity S to form an exhaust channel P2. The exhaust channel P2 is connected to the exhaust port 51 of the exhaust system 50. Figure 2 and Figure 3 As shown, the exhaust duct P2 extends in the vertical direction.

[0125] The lower section guide plate 52 and the middle section guide plate 53 are provided with multiple through holes.

[0126] For example, the lower baffle 52 has a plurality of lower through holes 521 on most of its panel. These lower through holes 521 are distributed in the left and right width direction of the lower baffle 52, which can discharge heavier pollutants from the fume hood 1. For example, along the height direction, the area within 500mm above the table is the main source of pollutants. The lower baffle 52 is equipped with a long slot feature (lower through holes 521) to increase the air velocity in the slot and accelerate the removal of pollutants.

[0127] The lower center of the middle section of the baffle plate 53 has multiple through holes 531, which are distributed along the width of the baffle plate 53 to discharge pollutants from the middle area into the fume hood 1. Along the width direction, the middle position is the main source of pollution; the slots (through holes 531) in the baffle plate 53 increase the airflow velocity and accelerate discharge. The corners and edges have no openings to reduce exhaust volume.

[0128] For example, no through holes are provided on the upper guide plate 54.

[0129] The above structure reduces the average surface velocity, thereby lowering the overall exhaust volume requirement. Furthermore, it facilitates the guidance of gas within the working chamber to the exhaust area, preventing the generation of air vortices. Additionally, since the through holes on the guide plate 205 are distributed along the entire left-right width of the guide plate 205, it helps to provide continuous exhaust with a substantially uniform width across the entire working chamber.

[0130] refer to Figures 2 to 5 In this embodiment of the application, the upper baffle 54 includes an extension section 542, which is located between the rear inner liner 103 and the middle baffle 53. Along the depth direction of the fume hood 1, the projection of the extension section 542 overlaps with the projection of the middle baffle 53. Along the depth direction, the extension section 542 and the middle baffle 53 are spaced apart to form a rotating channel P3. The rotating channel P3 extends along the height direction and communicates with the exhaust channel P2.

[0131] The conventional design of the deflector 205 typically involves setting the upper deflector 54 and the middle deflector 53 at intervals in the height direction to form an exhaust gap, or directly fixing them together without forming an exhaust gap. The airflow within the working chamber rises, thus creating a large vortex on the upper inner side.

[0132] refer to Figure 5 and Figure 18 In this embodiment, the design of the narrow channel (rotating channel P3) between the upper guide plate 54 and the middle guide plate 53 utilizes the reverse (downward) extraction of rising airflow before its discharge. This contrasts with the traditional design that causes airflow to rise, thereby forming a large vortex. In other words, the rising airflow enters the narrow channel (rotating channel P3). Figure 5 The middle H indicates the direction of airflow entering the rotating channel P3; after entering the narrow channel, the airflow first flows downward, enters the exhaust channel P2, and then rises into the channel between the upper guide plate 54 and the rear inner liner 103, and is then discharged through the exhaust port 51 of the exhaust channel P2.

[0133] In some possible implementations, the depth of the rotating channel P3 along the height direction is 20 mm to 1 m. This can improve the airflow organization within the cavity S, enabling the airflow to form a stable laminar fluid pattern, thereby allowing pollutants to be quickly removed.

[0134] This application does not limit the specific shape of the rotary channel P3. Any structure that can form a channel in which rising airflow is drawn in the opposite direction (downward movement) is within the scope of protection of this application.

[0135] In some possible implementations, the angle between the extension section 542 and the vertical line in the height direction is between -20° and 20°, and the angle between the mid-section guide vane 53 and the vertical line in the height direction is between -20° and 20°. That is, the extension section 542 can be positioned within a range where it is tilted 20° to the left or 20° to the right, and the mid-section guide vane 53 can be positioned within a range where it is tilted 20° to the left or 20° to the right.

[0136] Figure 5 The extension section 542 and the mid-section guide vane 53 are shown to be arranged in parallel. At this time, the angle between the extension section 542 and the vertical line in the height direction is 0°, and the angle between the mid-section guide vane 53 and the vertical line in the height direction is 0°.

[0137] For example, the width of the rotary channel P3 is between 10 mm and 80 mm. This configuration improves the airflow organization within the cavity S, creating a stable laminar fluid pattern that allows contaminants to be quickly removed.

[0138] In some possible implementations, refer to Figure 4 and Figure 5Along the height direction, the rear inner lining plate 103 is provided with a first connector 15, a second connector 16, and a third connector 17 at intervals. Exemplarily, the first connector 15, the second connector 16, and the third connector 17 extend along the depth direction.

[0139] Along the height direction, the lower section guide plate 52 is vertically installed. One end of the lower section guide plate 52 is connected to the first connector 15 and is spaced apart from the bottom side of the inner cavity S to form a first exhaust gap communicating with the exhaust channel P2. The other end of the lower section guide plate 52 is connected to the second connector 16. Along the height direction, the middle section guide plate 53 is vertically installed. One end of the middle section guide plate 53 is connected to the second connector 16 and forms a second exhaust gap communicating with the exhaust channel P2 between it and the lower section guide plate 52. The other end of the lower section guide plate 52 is connected to the third connector 17. Along the height direction, the upper section guide plate 54 also includes an inclined section 541. One end of the extension section 542 is connected to the third connector 17, and the other end of the extension section 542 is connected to one end of the inclined section 541. The other end of the inclined section 541 is inclined towards the front side of the inner cavity S and connected to the top inner liner 101 of the inner cavity S.

[0140] In some possible implementations, the other end of the inclined section 541 forms a third exhaust gap with the top liner 101 of the inner cavity S, communicating with the exhaust channel P2. Airflow from the top can exit through this gap. Figure 5 and Figure 18 Q6 shows the airflow entering this gap.

[0141] Continue to refer to Figure 17 The lower section guide plate 52 is provided with a lower exhaust area, which includes multiple lower section through holes 521; the middle section guide plate 53 is provided with a middle exhaust area, which includes multiple middle section through holes 531.

[0142] The main reason for the leakage of fume hood 1 is that there is no good airflow organization inside and outside fume hood 1.

[0143] Therefore, refer to Figure 18 In another embodiment of this application, the working chamber of the fume hood 1 is divided into three airflow organization zones from bottom to top along the height direction: A, B, and C. Wherein, Figure 18 Airflow organization region A is formed below the dashed line MM, and airflow organization region B is formed between the dashed lines MM and LL. Figure 18 The airflow organization region C is formed above the dashed line LL.

[0144] In airflow organization area A: at least 80% of the make-up air volume from the lower make-up air module 30 enters the exhaust channel P2 from the lower exhaust area and the first exhaust gap between the lower section guide plate 52 and the bottom side of the inner cavity S.

[0145] In airflow organization area B: at least 80% of the outdoor make-up air from the front opening 1a enters the exhaust duct P2 from the middle exhaust area and the second exhaust gap between the middle section guide vane 53 and the lower section guide vane 52.

[0146] In airflow organization area C: at least 80% of the make-up air volume from the upper make-up air module 20 enters the exhaust air channel P2 from the rotary channel P3.

[0147] Essentially, the air inlet of the lower air supply module 30 corresponds mainly to the lower exhaust area on the lower guide vane 52, and the air supply volume of the air supply module mainly enters the lower exhaust area of ​​the lower guide vane 52. The front opening 1a corresponds mainly to the middle exhaust area on the middle guide vane 53, and the air supply volume of the front opening 1a mainly enters the middle exhaust area of ​​the middle guide vane 53. The upper air supply module 20 corresponds mainly to the rotary channel P3, and the air supply volume of the upper air supply module 20 mainly enters the rotary channel P3.

[0148] With this configuration: 1) the amount of air drawn from the window opening (front opening) is reduced, achieving energy saving; 2) the arrangement of each air inlet prevents pollutants from overflowing from the window opening, and the upper and lower sides of the fume hood 1 are equipped with air inlets to prevent dirt from escaping from the fume hood; 3) for multiple air inlets and window openings, the guide plate structure of the above embodiment of this application is used to ensure that each air inlet corresponds to the exhaust opening on the guide plate; 4) ultimately ensures the stability of the airflow organization, achieving a laminar flow state without turbulence or disturbance, so that pollutants can be quickly discharged.

[0149] The airflow organization described above can be achieved by adjusting the exhaust ratio of each guide vane in terms of height, as well as the width and depth of the rotating channel P3, and by CFD simulation, thereby improving the airflow organization of the inner cavity S and forming a stable laminar fluid pattern.

[0150] In some possible implementations, at least 90% of the make-up air from the upper inner air inlet 21 enters the exhaust duct P2 through the third exhaust gap between the other end of the rotary passage P3 and the inclined section 541 and the top inner liner 101 of the inner cavity S; at least 80% of the make-up air from the upper outer air inlet 22 enters the exhaust duct P2 through the rotary passage P3, and the remainder enters the exhaust duct P2 from the middle exhaust area. This arrangement further improves the airflow organization of the inner cavity S and prevents the leakage of contaminants from the fume hood 1.

[0151] In some possible implementations, refer to Figure 17The lower section guide plate 52 has two sides 522 at one end with the left inner lining plate 105 and right inner lining plate 104 of the inner cavity S, and the middle section guide plate 53 has two sides 532 at one end with the left inner lining plate 105 and right inner lining plate 104 of the inner cavity S, and the middle section guide plate 53 has two sides 532 at one end with the left inner lining plate 105 and right inner lining plate 104 of the inner cavity S, and the middle section guide plate 53 has two sides 536 at one end; along the depth direction of the fume hood 1, the projections of the lower section guide plate 55 and the middle section guide plate 56 are along the adjacent line of the lower section guide plate 52 and the middle section guide plate 53. Figure 17 (As shown by the dashed line L) is symmetrical.

[0152] For example, along the width direction of the fume hood 1, the two sides 522 of the other end of the lower guide plate 52 have a first gap between them and the left inner lining plate 105 and the right inner lining plate 104 of the inner cavity S. The first gap gradually increases from bottom to top, that is, the shape of the lower exhaust vent 55 gradually increases from bottom to top. Along the width direction of the fume hood 1, the two sides 532 of one end of the middle guide plate 53 have a second gap between them and the left inner lining plate 105 and the right inner lining plate 104 of the inner cavity S. The second gap gradually decreases from bottom to top, that is, the shape of the middle exhaust vent 56 gradually decreases from bottom to top.

[0153] In some possible implementations, at least 70% of the make-up air from the side air supply module enters the exhaust channel P2 through the exhaust gap between the lower section guide plate 52 and the middle section guide plate 53 and the left and right lining plates of the inner cavity S, and the remainder enters the exhaust channel P2 through the lower exhaust port 55 and the middle exhaust port 56.

[0154] With this configuration: 1) the amount of air drawn from the window opening (front opening) is reduced, achieving energy saving; 2) the arrangement of each air inlet prevents pollutants from overflowing from the window opening, with air inlets on the top, bottom, left and right sides of the fume hood 1, preventing dirt from coming out in all aspects; 3) for multiple air inlets and window openings, the guide plate structure of the above embodiment of this application is used to ensure that each air inlet corresponds to the exhaust opening on the guide plate; 4) ultimately ensures the stability of the airflow organization, achieving a laminar flow state without turbulence or disturbance, so that pollutants can be quickly discharged.

[0155] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. A fume hood, characterized in that, include: The cabinet has an inner cavity that forms a working chamber, and a front opening that opens to the indoor environment is formed on the front side of the inner cavity. The make-up air system is used to supply air to the fume hood; An upper air supply module is located on the top side of the inner cavity and is connected to the air supply system. The upper air supply module includes an upper external air supply port, which is arranged facing the partition channel on the top side of the inner cavity. The upper external air supply port does not supply air from outside the viewing window. It also includes: a partition, disposed at the front opening and located on the top side of the inner cavity, spaced apart from the bottom side of the inner cavity along the height direction of the cabinet; a viewing window, disposed on the outside of the partition, which can move upward or downward relative to the partition along the height direction, and spaced apart from the partition along the depth direction of the cabinet to form the partition channel, which communicates with the inner cavity; and an upper external air supply vent facing the partition channel.

2. The fume hood as described in claim 1, characterized in that, The upper air supply module includes an upper air supply box, which has an upper air supply cavity and an air inlet communicating with the upper air supply cavity. The upper air supply cavity is provided with a perforated plate. Outside air enters the upper air supply cavity through the air inlet, passes through the perforated plate, and flows out of the upper air supply box through the upper external air supply port.

3. The fume hood as described in claim 2, characterized in that, The upper air supply chamber includes a first upper air supply chamber and a second upper air supply chamber. The air inlet is connected to the first upper air supply chamber, and the upper external air supply port is connected to the second upper air supply chamber. The perforated plate includes a guide plate, which is located between the first upper air supply chamber and the second upper air supply chamber. Outside air enters the first upper air supply chamber through the air inlet, passes through the guide plate, enters the second upper air supply chamber, and flows out of the upper air supply box through the upper external air supply port.

4. The fume hood as described in claim 3, characterized in that, The enclosure includes a top plate, an arc plate, a connecting plate, and a bottom plate. The arc plate faces the inner cavity, the connecting plate extends along the height direction and faces away from the inner cavity, and the upper external air intake is located on the bottom plate. Along the height direction, the air inlet is located on the top plate, and the second upper air supply cavity is located below the first upper air supply cavity; The guide plate includes a first inclined section, which is inclined upward and connected to the connecting plate. The first inclined section is provided with multiple air filter holes.

5. The fume hood as described in claim 4, characterized in that, Along the height direction, the first inclined section is offset from the air inlet, and the first inclined section is opposite to the upper external air supply inlet.

6. The fume hood as described in any one of claims 1 to 5, characterized in that, It also includes a lower section guide plate, a middle section guide plate and an upper section guide plate arranged along the height direction. The lower section guide plate, the middle section guide plate and the upper section guide plate are spaced apart from the rear inner lining plate of the inner cavity to form an exhaust channel. The exhaust channel is connected to the exhaust system. The lower section guide plate is provided with a lower exhaust area, and the middle section guide plate is provided with a middle exhaust area; The upper guide plate includes an extension section along the depth direction of the cabinet. The extension section and the middle guide plate are spaced apart to form a rotating channel. The rotating channel extends along the height direction and is connected to the exhaust channel.

7. The fume hood as described in claim 6, characterized in that, At least 80% of the make-up air from the upper external air inlet enters the exhaust air duct from the rotary channel.

8. The fume hood as described in any one of claims 1 to 5 and 7, characterized in that, The height from the upper external air inlet to the bottom of the inner cavity is between 750mm and 1600mm.

9. The fume hood as described in any one of claims 1 to 5 and 7, characterized in that, The wind speed at the upper external air supply vent is between 0.3 m / s and 1.5 m / s.

10. The fume hood as described in any one of claims 1 to 5 and 7, characterized in that, The upper external air inlet extends along the left and right width direction of the working chamber.

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