CN216501402U - Fume hood with rectification bellows - Google Patents

Abstract

The ventilation cabinet with the rectification air box comprises a cabinet main body with a cabinet inner cavity and the rectification air box; the rectifying wind box comprises a first sidewall body and a second sidewall body which are arranged in parallel; the wall structure is characterized in that the second sidewall body is provided with a wall body hole, the second sidewall body also comprises a hole sealing plate capable of covering the wall body hole, and the hole sealing plate is fixedly connected to the wall body around the wall body hole; the guide vane is arranged between the hole sealing plate and the first side wall body, and is fixedly connected to the hole sealing plate or the first side wall body through one side edge of the guide vane in a unilateral fixing mode, so that the installation operation is simplified, the installation efficiency of the air box is improved, and the cost is reduced; the flow deflector is L-shaped and comprises an air supply plate and a windward plate arranged on the air supply plate, the windward plate is arranged in the wind channel windward, the windward plate positioned at the downstream is higher than the windward plate positioned at the upstream, and a leading-out wind channel is formed between the front and rear adjacent air supply plates, so that the wind entering the wind channel from the outside of the wind box is guided by the windward plate to enter the leading-out wind channel and then is discharged.

Description

Fume hood with rectification bellows

Technical Field

The invention relates to a fume hood, in particular to a fume hood with a rectification air box.

Background

The fume chamber belongs to the common local exhaust system in the chemistry experiment room, can remove a large amount of harmful gas with less amount of wind, and the diffusion of control harmful gas ensures laboratory staff's health and safety. The air supply type fume hood is a common device at present, but the product of the structure requires uniform air supply, and disturbance to air in the hood is reduced as much as possible. For this purpose, the prior art largely adopts the guide vane technology.

For example, in 1953, the US patent publication No. US2627220 entitled "fume hood" discloses an air guiding mechanism, which includes a plurality of flow deflectors arranged in a line, each flow deflector is L-shaped and includes a vertical plate surface arranged vertically and a horizontal plate surface arranged on the vertical plate surface, the vertical plate surfaces of all the flow deflectors are arranged in parallel to form a plurality of air inlet ducts, the horizontal plate surfaces of all the flow deflectors are arranged in parallel to form a plurality of air outlet ducts, and an air flow flowing from top to bottom is guided by the vertical plate surfaces of the flow deflectors to be distributed into the air inlet ducts and then flows out of the air outlet ducts. A similar air guiding structure is also described in JP 61071264.

The above prior art discloses the application of the baffle to the products such as the fume hood, but does not disclose how to fix the baffle in the air duct. In the technical scheme of the Chinese patent application number 201610152404.1 entitled "a flow stabilizing structure and a ventilation device using the same", a cabinet body with a working cavity and an air supplementing channel are disclosed, wherein the air supplementing channel extends along the left and right width directions of the working cavity. The air supply channel is internally provided with a flow stabilizing structure, the flow stabilizing structure comprises a plurality of near L-shaped drainage plates, all the drainage plates are arranged in a straight line, the longitudinal plate surfaces of the drainage plates are arranged in parallel relatively, the wind catching plate surfaces of all the drainage plates face in the same direction, the two sides of the plate surfaces of all the drainage plates are clamped tightly by the walls forming the air flow channel without gaps, so that air flow channels separated by all the drainage plates are formed, air flow is guided to the air flow channels from the wind catching plate surfaces along the longitudinal plate surfaces and blown out, the longitudinal plates of all the drainage plates and the air outlet guide plates are arranged in an orthogonal mode, and the drainage plates of the scheme are clamped and fixed by the wall bodies on the two sides of the plate surfaces without gaps. This positioning of the drainage plate is obviously not particularly reliable and is susceptible to deflection by the blowing force of the air flow.

Disclosure of Invention

It should be known that the left and right width of a common ventilation hood on the market is generally 1m to 1.8m, in order to be able to uniformly supply air to the ventilation hood, the left and right width of an air supply channel also needs to be set to 1m to 1.8m, and the upper and lower height is also generally 0.4m to 1.0 m, so that it is a relatively difficult matter to fix the drainage plate in the large-width air supply channel, the proposal proposed by the 201610152404.1 patent proposal adopts a clamping manner to fix the drainage plate, if the wall thickness of the air duct is too small, for example, 0.2mm to 1 mm, the flexibility is too large and the rigidity is not enough, and the two sides of the plate surface of the drainage plate in the air duct cannot be clamped without gap under the natural state unless the wall thickness of the air duct is increased to 3mm to 5mm or auxiliary clamping devices are added on the two sides of the air duct, and the two sides of the drainage plate surface are respectively connected with the two side wall bodies of the air duct in a sealing manner, but certainly increase the cost of manufacture and the difficulty of processing.

In the chinese patent 201610152404.1, both sides of the plate surface of the flow guide plate are clamped without gaps, so as to form an airflow path that is separated and closed by the flow guide plate, and guide the airflow to be uniformly distributed, but the difficulty of clamping is high, which results in high manufacturing cost and processing difficulty of the product. The inventor of the invention has taken this doubt to carry out multiple air flow tests, and finds that the process of air flow flowing from front to back is actually the process of air pressure attenuation, and the plurality of flow guide plates are arranged along the direction of air pressure attenuation, so that the air pressure of the downstream air flow passage is lower than that of the upstream air flow passage, while the structure of patent 201610152404.1 that clamps the two sides of the plate surface of the flow guide plate without gap prevents the air pressure transmission between the two adjacent air flow passages, on the contrary, if the two sides of the plate surface of the flow guide plate (also called as flow guide plate) are not clamped by gap, but leave a proper amount of air gap, it is beneficial to the air pressure transmission between the two adjacent air flow passages. Therefore, in the flow guide structure, two sides of the surface of the flow guide sheet are not necessarily clamped by a gap, and the uniformity of air pressure distribution is optimized under the condition that a proper amount of air passing gaps are reserved. On the basis, the inventor further proves that since the two sides of the plate surface of the guide vane do not need to be clamped without clearance, the wall body of the air duct can be formed by adopting a thinner material, and the wall body can also be processed by adopting a simple process, so that the processing procedure is simplified, and the material is saved.

Based on the above findings, one of the objectives of the present invention is to provide a simple and convenient fixing structure for a baffle of a ventilation cabinet with a rectification bellows, which includes a cabinet main body having a cabinet inner cavity, and a rectification bellows disposed on the cabinet main body, wherein the rectification bellows is used for supplying air to the cabinet inner cavity or supplying curtain air at an opening of the cabinet inner cavity; the rectifying wind box comprises a first sidewall body and a second sidewall body which are arranged in parallel, a wind channel is arranged between the first sidewall body and the second sidewall body, and at least 2 guide vanes which are arranged at intervals in the front and back are arranged in the wind channel; the wall structure is characterized in that a wall body hole is formed in the second side wall body, the second side wall body further comprises a hole sealing plate capable of covering the wall body hole, and the hole sealing plate is fixedly connected to the wall body around the wall body hole; the flow deflector is arranged between the hole sealing plate and the first side wall body, and is fixedly connected to the hole sealing plate or the first side wall body through one side edge of the flow deflector in a unilateral fixing mode; the flow deflector is L-shaped and comprises an air supply plate and an air incoming plate arranged on the air supply plate, the air incoming plate is arranged in the air channel in a windward mode, the air incoming plate positioned at the downstream is higher than the air incoming plate positioned at the upstream, and a leading-out air channel is formed between the front and rear adjacent air supply plates, so that the air entering the air channel from the outside of the air box is guided by the air incoming plate to enter the leading-out air channel and then is discharged.

Wherein, the guide vanes are 2, 3 or 4, etc. In a further scheme, a group of flow stabilizing groups is formed by combining a plurality of flow deflectors, and a left flow stabilizing group and a right flow stabilizing group can be arranged in the left width direction and the right width direction of the air box.

The windward plate is arranged in the wind channel in a windward mode, and a windward plate surface of the flow deflector is defined to guide airflow in the wind channel to change the flow direction and enter the extraction air channel. In a more typical embodiment, the windward plate surface is preferably curved to smoothly guide the airflow in the wind channel into the outlet duct, thereby reducing turbulence in the airflow.

The flow deflector is arranged between the hole sealing plate and the first side wall body, so that the hole sealing plate and the first side wall body are two side wall bodies respectively adjacent to two sides of the flow deflector.

Wherein the guide vane is fixedly connected to the hole sealing plate or the first sidewall body through one side edge thereof in a single-side fixing manner, so that one of the practical applications may be: one side edge of the flow deflector is fixedly connected to the first sidewall body in a unilateral fixing manner, and the other side edge of the flow deflector is a free end, and the free end and the hole sealing plate are close to each other (the free end and the hole sealing plate can be arranged at intervals without contact or are contacted with each other but are only close to each other and not fixedly connected with each other, so that a certain gap still exists). In this way, firstly, during processing, only one side edge of the guide vane needs to be fixed (for example, welded and bonded) on the first sidewall body, the hole sealing plate is fixedly connected on the wall body around the wall body hole, the sealing cover is close to the guide vane, and the air box is formed by splicing the wall body hole and the guide vane together, so that the processing steps are simple; and after the combination is finished, the guide vanes are stably and reliably positioned in the air channel. Thus, the following installation sequence can be selected in the practical application process: firstly, under the condition that the hole sealing plate is not installed, the flow deflector is fixedly connected to the first side wall body through the wall body hole in advance, due to the fact that the hole sealing plate does not block, the installation area of the flow deflector can be directly observed through the wall body hole, installation operation space is abundant, and convenience is well provided for the fixed connection operation between the flow deflector and the first side wall body. And then the hole sealing plate is arranged at the side position of the flow deflector and is fixedly connected on the wall body at the periphery of the wall body hole, so that the whole installation operation is convenient and fast, and the installation efficiency of the bellows is improved.

According to the above scheme, all the flow deflectors can be fixedly connected to the hole sealing plate or the first sidewall body in a single-side fixing manner in a centralized manner; alternatively, a part of the flow deflectors are fixedly connected to the hole sealing plate in a unilateral fixing manner, and the other part of the flow deflectors are fixedly connected to the first sidewall body in a unilateral fixing manner. In the case that the baffle is fixedly connected to the hole-sealing plate in a unilateral fixed manner by one side edge, when the hole-sealing plate is fixedly connected to a wall body around the wall body hole, the baffle enters the wind channel through the wall body hole, and the other side edge of the baffle is a free end, which is close to the first sidewall body (may be arranged at intervals without contact, or may be in contact with but is only in loose connection with each other so that a certain gap still exists).

According to the technical scheme, compared with the prior art, the invention has the beneficial technical effects that: firstly, since the guide vane is fixedly connected to the hole sealing plate or the first sidewall body through one side edge thereof in a single-side fixing manner, during processing, on the basis that the guide vane is connected with one side wall body of the sealing hole plate or the first side wall body in a welding mode, an adhering mode and the like, the sealing hole plate and the first side wall body can be directly connected together in a gathering and splicing mode to form the air channel, the guide vane is combined with the guide vane to form the leading-out air channel, the connection problem between the other side edge of the guide vane and the adjacent other side wall body does not need to be considered after splicing, the problem that the guide vane needs to be clamped by two side walls in the prior art does not need to be considered, and the problem that the positioning of the guide vane is unreliable does not need to be considered, thereby simplifying the installation operation, improving the installation efficiency of the air box and reducing the process cost; based on the structure and the forming process thereof, the requirements on the thickness and rigidity of the first sidewall body and the hole sealing plate can be further reduced, so that the material cost is reduced. Although the first sidewall body and the hole sealing plate can be of thick-walled and thin-walled structures, in order to reduce the material cost of the bellows, the first sidewall body and the hole sealing plate are preferably of thin-walled structures. Secondly, at least 2 guide vanes which are arranged at intervals in the front and back are arranged in the air channel, so that the generation of turbulent flow can be reduced by utilizing the guide vanes, the stability of air flow in the air channel is improved, the air flow is uniformly distributed, and in addition, because no gapless clamping structure is adopted among the guide vanes, the hole sealing plate and the first side wall body, the air pressure in the front and back leading-out air channel can be balanced by means of the gaps among the guide vanes, the hole sealing plate and the first side wall body.

Further technical solution may also be that the guide vane is welded to the hole sealing plate or the first sidewall body. The fixed connection between the guide vane and the closing-off plate or the first sidewall body is realized, for example, by a spot welding process. Or, the flow deflector is adhered to the hole sealing plate or the first sidewall body.

The further technical scheme can also be that the hole sealing plate is welded, adhered or screwed on the wall body around the wall body hole.

The further technical scheme can also be that the thicknesses of the hole sealing plate and the first side wall body are respectively 0.2 mm-0.5 mm, and the thicknesses can be 0.2mm, 0.3mm, 0.4mm and 0.5mm in application. The thin-wall structure is selected to be beneficial to reducing the production cost of the air box.

The further technical scheme can also be that the bottom ends of the guide vanes which are arranged at intervals in the front and back are arranged in different heights. Namely, the height difference exists between the bottom ends of the air supply plates of the guide vanes which are arranged at intervals in the front-back direction, but the air supply plates are not all positioned on the same straight line, so that the air pressure in the front-back leading-out air channel can be balanced by means of a structure with uneven bottom end height.

The rectification air box further comprises an air outlet flow guide device positioned at the downstream of the extraction air channel, and the air outlet flow guide device is used for outputting airflow guided by the extraction air channel. Therefore, the air outlet direction, the air flow distribution condition and the like of the air box can be adjusted again by utilizing the air outlet guide device.

The further technical scheme can also be that the rectification bellows further comprises a top wall body, the top wall body is arranged between the first side wall body and the second side wall body and located above the flow deflector, the top wall body, the first side wall body and the second side wall body are combined to define the air channel, and the air outlet flow guide device is located below the flow deflector.

Due to the characteristics and advantages, the invention can be applied to the fume hood with the rectification bellows.

Drawings

FIG. 1 is a schematic perspective view of a fume hood to which the present invention is applied 100;

FIG. 2 is a schematic perspective view of a windbox 100 suitable for rectification to which the present invention is applied;

FIG. 3 is an exploded view of the bellows 100;

FIG. 4 is a schematic front view of the bellows 100;

fig. 5 is a schematic sectional view in the direction of a-a in fig. 4, in which the guide vane 3 is partially shown by a dotted line;

fig. 6 is a schematic view of an installation structure between a plurality of guide vanes 3 and the air outlet guide device 4.

Detailed Description

As shown in fig. 1, the present invention provides a fume hood comprising a hood body 7 having a hood inner chamber 70 and a wind box 100 adapted for straightening, the wind box 100 being disposed on the hood body 7 at a top position of the hood body 7. The wind box 100 supplies air downwards, and is used for providing air curtain air at the opening position 71 of the cabinet inner cavity 70, separating the cabinet inner cavity 70 from the external space, and reducing the overflow of harmful gas in the cabinet inner cavity 70 and the influence of the change of the external space air pressure on the internal air pressure of the cabinet inner cavity 70. In addition, another wind box (not shown, having a structure similar to that of the wind box 100 and not repeatedly discussed) is disposed below the cabinet interior 70 for supplying supplementary wind to the cabinet interior 70.

Wherein the bellows 100 comprises two side walls arranged substantially parallel, between which the wind channel 10 is arranged, at least 2 guide vanes 3 which are arranged at intervals in the front and the back are arranged in the wind channel 10 (the number of the guide vanes 3 can be 2, 3 or 4, etc.); it is characterized in that the preparation method is characterized in that, the guide vane 3 is fixedly connected to one of the two sidewall bodies by one side edge thereof in a unilateral fixing manner, the flow deflector 3 is L-shaped and comprises an air supply plate 31 and an air inlet plate 32 arranged on the air supply plate 31, the windward plates 32 are arranged in the wind channel 10 windward, the windward plate at the downstream is higher than the windward plate at the upstream, an outlet air duct 30 is constructed between the adjacent air supply plates, so that the wind entering the wind channel 10 from the outside of the wind box 100 is guided by the windward plate 32 to enter the outlet duct 30 and then is discharged.

The structure of the bellows 100 will be described in detail with reference to the accompanying drawings. Various implementation details disclosed below may be selectively applied or combined in one embodiment even if not directly related or synergistic in functional terms, except where expressly specified to belong to equivalent or alternative embodiments.

As shown in fig. 6, in the present embodiment, six baffles are disposed in the wind box 100, the front three baffles and the rear three baffles are arranged in a mirror-image symmetry manner to form two flow stabilizing groups, the first three baffles are taken as an example for description, and for convenience of discussion, the first three baffles are distinguished by 3a, 3b, and 3 c. They are similar in structure, and the main difference is the size difference, and the third guide vane 3c is taken as an example for description. The third guide vane 3c is L-shaped and includes a third vertical wind plate 31c and an arc third windward plate 32c arranged on the third wind plate 31c, and the third windward plate 32c is arranged in the wind channel 10 facing the wind. The third windward plate 32c of the downstream third guide vane 3c is higher than the second windward plate 32b of the upstream second guide vane 3b so that there is a height difference H therebetween, and a third outlet air duct 30' is constructed between the third air supply plate 31c of the front and rear adjacent third guide vanes 3c and the second air supply plate 31b of the second guide vane 3 b. The wind passing through the wind inlet 80 from the outside enters the wind channel 10 and flows away from the height difference space between the third windward plate 32c and the second windward plate 32b, and is guided by the third windward plate 32c to change the flow direction and enter the third outlet wind channel 30'.

As shown in fig. 2 to 6, the two sidewall bodies of the wind box 100 are a first sidewall body 1 and a second sidewall body 2, respectively. The second sidewall body 2 is provided with a wall body hole 220, the second sidewall body 2 further includes a hole sealing plate 21 capable of covering the wall body hole 220, and the hole sealing plate 21 is fixedly connected to the wall body 22 around the wall body hole 220. The wall body 22 is formed by splicing folded edges which are respectively bent and formed at the top of the top wall body 5, the top of the air outlet guide device 4 and the top of the end wall body 8, which will be discussed below. In other embodiments, the wall 22 may be a one-piece plate and welded to the top wall 5, the air outlet deflector 4, and the end wall 8. The baffle 3 is fixedly connected to the first sidewall body 1 by one of its sides in a single-sided fastening manner and is arranged between the perforated closure 21 and the first sidewall body 1. All the guide vanes 3 are intensively and fixedly connected to the first sidewall body 1.

The guide vane 3 is fixedly connected to the first sidewall body 1 through one side edge thereof in a unilateral fixing manner, and at this time, the other side edge of the guide vane 3 is a free end, and the free end and the hole sealing plate 21 are close to each other but not in contact with each other and are arranged at intervals, as shown in fig. 5, a gap H1 is left between the guide vane 3 and the hole sealing plate 21. (of course, in other embodiments, the free ends may be in contact with the sealing plate 21 but merely in close and loose connection with each other so that a certain gap still exists.) in this way, first, during the manufacturing process, only one side of the baffle 3 needs to be fixed (e.g., welded, bonded) to the first sidewall 1, the sealing plate 21 is fixedly connected to the wall 22 around the wall hole 220, and the sealing plate and the baffle 3 are closed and close to each other, so as to form the wind box 100, and the manufacturing steps are simple; and after the combination is finished, the guide vanes 3 are stably and reliably positioned in the wind channel 10. Thus, the following installation sequence can be selected in the practical application process: firstly, under the condition that the hole sealing plate 21 is not installed, the flow deflector 3 is fixedly connected to the first sidewall body 1 through the wall body hole 220 in advance, and because the block of the hole sealing plate 21 is not existed, the installation area of the flow deflector 3 can be directly observed through the wall body hole 220, and the installation operation space is abundant, thereby providing convenience for the fixed connection operation between the flow deflector 3 and the first sidewall body 1. Then, the hole sealing plate 21 is placed at the side position of the baffle 3 and fixedly connected (for example, welded, bonded or screwed) to the wall body around the wall body hole 220, so that the whole installation operation is convenient and fast, and the installation efficiency of the air box 100 is improved.

In the processing, on the basis of connecting the flow deflector 3 and the first sidewall body 1 by welding, bonding and other modes, the hole sealing plate 21 and the first sidewall body 1 can be directly closed, spliced and connected to form the air channel 10, and the air channel 30 is formed by combining with the flow deflector 3, so that the problem of connection between the other side edge of the flow deflector 3 and the hole sealing plate 21, the problem that two side walls need to clamp the flow deflector 3 in the prior art and the problem that the positioning of the flow deflector 3 is unreliable are not considered after splicing, the mounting operation is simplified, the mounting efficiency of the air box 100 is improved, and the process cost is reduced; based on the structure and the forming process thereof, the requirements on the thickness and rigidity of the first side wall body 1 and the hole sealing plate 21 can be further reduced, so that the material cost is reduced. Although the first sidewall 1 and the orifice plate 21 may be of a thick-walled and thin-walled structure, the first sidewall 1 and the orifice plate 21 are preferably of a thin-walled structure in order to reduce the material cost of the bellows 100. The thicknesses of the hole sealing plate 21 and the first side wall body 1 are respectively 0.2 mm-0.5 mm, and can be 0.2mm, 0.3mm, 0.4mm and 0.5mm in application. The thin-walled structure is selected to facilitate reducing the production cost of the bellows 100. In addition, at least 2 guide vanes 3 which are arranged at intervals are arranged in the air channel 10, so that the generation of turbulent flow can be reduced by utilizing the guide vanes 3, the stability of air flow in the air channel 10 is improved, and the air flow is uniformly distributed, and in addition, because no gapless clamping structure is adopted between the guide vanes 3 and the hole sealing plate 21 and between the guide vanes 3 and the first side wall body 1, the air pressure in the front and rear extraction air channels 30 can be balanced by means of the gaps between the guide vanes 3 and the hole sealing plate 21 and between the guide vanes 3 and the first side wall body 1.

In addition, in other embodiments, all the guide vanes 3 may be fixedly connected to the hole sealing plate 21 in a single-side fixed manner; alternatively, a part of the guide vanes 3 may be fixedly connected to the hole sealing plate 21 in a single-side fixing manner, and another part of the guide vanes 3 may be fixedly connected to the first sidewall body 1 in a single-side fixing manner. In the case that the baffle 3 is fixedly connected to the orifice plate 21 by one side edge thereof in a unilateral fixing manner, when the orifice plate 21 is fixedly connected to the wall body 22 around the wall body hole 220, the baffle 3 enters the wind channel 10 through the wall body hole 220, and the other side edge of the baffle 3 is a free end, which is close to the first sidewall body 1 (may be spaced apart without contact, or may be fixedly connected to each other without contact but only close to each other so that a certain gap still exists). In another embodiment, the first sidewall and the second sidewall may have various structures, and may have an integral structure, in which case the first sidewall and the second sidewall are formed as a thin-walled structure as a whole.

As shown in fig. 3 and fig. 6, the wind box 100 further includes an air outlet guiding device 4 located at the downstream of the outlet air duct 30, and the air outlet guiding device 4 is configured to output the airflow guided by the outlet air duct 30. In this embodiment, the air outlet guide device 4 is a mesh grille. In this way, the air outlet direction, the air flow distribution, and the like of the air box 100 can be adjusted again by using the air outlet guide device 4. The bellows 100 further includes a top wall 5, the top wall 5 is disposed between the first sidewall 1 and the second sidewall 2 and located above the baffle 3, the top wall 5 and the first sidewall 1 and the second sidewall 2 are combined to define the air passage 10, and the air outlet guiding device 4 is located below the baffle 3. Two left and right end wall bodies 8 are further arranged between the first side wall body 1 and the second side wall body 2, and the air inlet 80 is arranged on the end wall bodies 8.

As shown in fig. 3 and fig. 6, a distance 6 is provided between the bottom end 310b of the air feeding plate of the second guide vane 3b and the air outlet guide device 4, and the bottom end 310a of the air feeding plate of the first guide vane 3a located in front of the second guide vane and the bottom end 310c of the air feeding plate of the third guide vane 3c located behind the first guide vane are respectively attached to the air outlet guide device 4. It can be seen that the bottom ends of the guide vanes 3 arranged at intervals in the front-back direction are arranged in different heights, and have height differences, rather than being all located on the same straight line, so that the air pressure in the front-back leading-out air duct 30 can be balanced by means of the structure that the bottom ends are arranged in different heights.

Claims (8)

1. The ventilation cabinet with the rectification bellows comprises a cabinet main body with a cabinet inner cavity and the rectification bellows, wherein the rectification bellows is arranged on the cabinet main body and is used for supplying air supplement to the cabinet inner cavity or supplying air curtain air at a cavity opening position of the cabinet inner cavity; the rectifying wind box comprises a first sidewall body and a second sidewall body which are arranged in parallel, a wind channel is arranged between the first sidewall body and the second sidewall body, and at least 2 guide vanes which are arranged at intervals in the front and back are arranged in the wind channel; the wall structure is characterized in that a wall body hole is formed in the second side wall body, the second side wall body further comprises a hole sealing plate capable of covering the wall body hole, and the hole sealing plate is fixedly connected to the wall body around the wall body hole; the flow deflector is arranged between the hole sealing plate and the first side wall body, and is fixedly connected to the hole sealing plate or the first side wall body through one side edge of the flow deflector in a unilateral fixing mode; the flow deflector is L-shaped and comprises an air supply plate and an air incoming plate arranged on the air supply plate, the air incoming plate is arranged in the air channel in a windward mode, the air incoming plate positioned at the downstream is higher than the air incoming plate positioned at the upstream, and a leading-out air channel is formed between the front and rear adjacent air supply plates, so that the air entering the air channel from the outside of the air box is guided by the air incoming plate to enter the leading-out air channel and then is discharged.

2. A ventilated hood with rectifying windbox according to claim 1 wherein said baffle is welded to said blind panel or first sidewall body.

3. A ventilated hood with rectifying windbox according to claim 1 wherein said baffle is bonded to said hole-closing plate or first sidewall body.

4. A ventilated cabinet with rectifying windbox according to claim 1 wherein said hole-sealing plate is welded, bonded or screwed to the wall at the periphery of said wall hole.

5. A ventilated hood with rectifying windbox according to claim 1 wherein the thickness of said hole-sealing plate and the first sidewall body is 0.2mm to 0.5mm, respectively.

6. A fume hood with flow straightening air boxes according to any one of claims 1 to 5, characterized in that the bottom ends of the guide vanes which are arranged at intervals in the front and back are arranged in a non-uniform manner.

7. The ventilated hood with straightening windboxes according to claim 6, further comprising an air outlet guide device located downstream of the outlet wind tunnel, the air outlet guide device being configured to output the air flow guided by the outlet wind tunnel.

8. A fumehood with rectifying windboxes according to claim 7 further comprising a top wall disposed between said first and second sidewall bodies and above said baffle, said top wall in combination with said first and second sidewall bodies defining said air passage, said air outlet guide being located below said baffle.

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