CN216262618U - Walk-in type exhaust cabinet - Google Patents

Abstract

The utility model discloses a walk-in exhaust cabinet, which comprises an exhaust cabinet main body, an air supplementing and air inlet device and an exhaust device, wherein the air supplementing and air inlet device and the exhaust device are arranged on the exhaust cabinet main body; the air supplementing and inlet device comprises an air inlet distribution box, the top of the air inlet distribution box is connected with an external air inlet pipeline, the bottom of the air inlet distribution box is communicated with a first air supplementing channel, and the two ends of the air inlet distribution box are respectively communicated with a second air supplementing channel component; the first air supplementing channel is arranged at the top of the cavity; the second air supplementing channel assembly is arranged in cavities at two sides of the exhaust cabinet main body and is communicated with the side plate, and a plurality of first air supplementing holes are formed in the side plate; the second air supplement channel component comprises a plurality of air supplement interlayer and a flow guide piece which are longitudinally arranged; one side of the air supplement interlayer close to the side plate is provided with second air supplement holes, the second air supplement holes correspond to the first air supplement holes and are distributed in a staggered mode, and the first air supplement holes are closer to the inner part of the cavity than the second air supplement holes; the flow guide piece is arranged between the air supplementing interlayer and the side plate; thus improving the air supplement effect and reducing the working energy consumption.

Description

Walk-in type exhaust cabinet

Technical Field

The utility model relates to the technical field of laboratory exhaust equipment, in particular to a walk-in exhaust cabinet.

Background

The walk-in exhaust cabinet is one of the exhaust cabinets, and as the walk-in exhaust cabinet can accommodate higher and large experimental equipment, experimenters can completely enter the exhaust cabinet and is specially designed for laboratories needing higher operation space. The walk-in exhaust cabinet is mainly used for collecting and discharging harmful gas sources generated in various testing processes.

The standard for measuring the laboratory exhaust cabinet is to meet the following requirements: the harmful gas cannot overflow and the turbulent flow cannot be generated in the cabinet. Typically, inlet wind speeds of 0.4m/s to 0.6m/s are better able to control the gas in the cabinet. The existing exhaust cabinet controls the inlet air speed within 0.4-0.6 m/s by adopting a large-air-volume air extractor, and discharges poisonous and harmful gas outdoors, so that an operator walks or operates nearby the exhaust cabinet, the interference air flow is small, and laboratory gas is not leaked outside.

The step-in exhaust cabinet has higher height, the air extracting device is always in high-air-volume work, and the energy consumption is higher than that of the common exhaust cabinet.

Therefore, a new walk-in type exhaust hood is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects in the prior art, the utility model provides a walk-in type exhaust cabinet.

The technical scheme of the utility model is as follows:

the utility model provides a walk-in exhaust cabinet, which comprises an exhaust cabinet main body and a protection window connected with the exhaust cabinet main body, wherein a cavity with an opening at the front side is formed in the exhaust cabinet main body;

the air supplementing and inlet device comprises an air inlet distribution box which is arranged on the top plate, the top of the air inlet distribution box is connected with an external air inlet pipeline, the bottom of the air inlet distribution box is communicated with a first air supplementing channel, and the left end and the right end of the air inlet distribution box are respectively communicated with a second air supplementing channel component;

the first air supplementing channel is used for supplementing air into the cavity from the top plate and is arranged at the top of the cavity; the second air supplementing channel assembly is used for supplementing air into the cavity from two sides of the side plate, is arranged in the cavities at two sides of the exhaust cabinet main body and is communicated with the side plate, and a plurality of first air supplementing holes are formed in the side plate;

the second air supplement channel assembly comprises a plurality of air supplement interlayer and a flow guide piece which are longitudinally arranged; one side of the air supplement interlayer, which is close to the side plate, is provided with second air supplement holes, the second air supplement holes correspond to the first air supplement holes and are distributed in a staggered manner, and the first air supplement holes are closer to the inside of the cavity than the second air supplement holes; the flow guide piece is arranged between the air supplementing interlayer and the side plate and used for guiding air to enter the corresponding first air supplementing hole from the second air supplementing hole and then enter the cavity.

Furthermore, the first air supplementing holes are arranged in a plurality of rows which are uniformly distributed, and the number of the second air supplementing holes is the same as that of the first air supplementing holes; the number of the flow guide pieces is equal to the number of the rows of the first air supplement holes; the number of the flow guide pieces and the number of the air supplement interlayers are in a multiple relation; the flow guide piece and the side plate are arranged at an included angle.

Furthermore, the number of the air supplementing interlayers arranged on one side of the exhaust cabinet main body is 4, each air supplementing interlayer comprises two rows of second air supplementing holes, each air supplementing interlayer corresponds to two flow guide pieces, and each flow guide piece corresponds to one first air supplementing hole; the included angle between the flow guide piece and the side plate is 45 degrees.

Furthermore, first tonifying wind passageway includes a gentle aerofoil, the sixth tonifying wind hole has been seted up on the gentle aerofoil, gentle aerofoil sets firmly in the cavity top, and becomes the contained angle setting with the roof for the inside and the lower part tonifying wind of wind direction cavity.

Further, the air inlet flow distribution box wholly is big structure down in the top, includes:

the bottom plate is provided with a third air supplementing hole, and a fourth air supplementing hole is formed in the corresponding position on the top plate;

the flow distribution plate is arranged in the middle of the bottom plate, the cross section of the flow distribution plate is in an isosceles triangle shape, the flow distribution plate comprises a first plate and a second plate forming an included angle with the first plate, and fifth air supplement holes are formed in the first plate and the second plate; the first plate and the second plate respectively face to ports at the left end and the right end of the air inlet flow distribution box.

Further, the air inlet flow distribution box still includes:

the fan and setting are in auxiliary heating device under the fan, fan quantity is at least one, sets up at the top of air inlet flow distribution box for with wind blowing to auxiliary heating device.

Furthermore, the number of the auxiliary heating devices is two, and the two auxiliary heating devices are respectively and fixedly arranged on the first plate and the second plate.

Furthermore, the air supplementing and air inlet device also comprises an air inlet valve which is arranged between the air inlet distribution box and an external air inlet pipeline and used for adjusting the air inlet amount; the exhaust device comprises a gas collecting hood and an exhaust valve which are arranged on the top plate, and the exhaust valve is arranged between the gas collecting hood and an external exhaust pipeline and used for adjusting the exhaust volume.

Furthermore, the gas collecting hood is of a long-strip semi-arc structure with an opening at the bottom, and an exhaust port for connecting an external exhaust pipeline extends from the upper part of the gas collecting hood.

Further, the air inlet valve is set to be a butterfly valve or a Venturi valve; the exhaust valve is set to be a butterfly valve or a venturi valve.

The utility model achieves the following beneficial effects:

according to the walk-in exhaust cabinet, the air supplementing and air inlet device is arranged on the exhaust cabinet main body, and an air source entering from the outside is continuously and uniformly supplemented into the cavity by utilizing the air inlet flow dividing box, the first ventilation channel communicated with the bottom and the second ventilation channel components communicated with the two sides to form an air curtain, so that the air supplementing effect is further improved, the external wind energy can smoothly enter the cavity, and meanwhile, the harmful gas in the cavity can be prevented from overflowing; the air pressure in the cavity is kept stable and balanced, and the working energy consumption is reduced.

The auxiliary heating device is additionally arranged in the air inlet flow dividing box, so that the cold weather can be solved, and particularly the existing problem that the experimental result is influenced by low-temperature cold air fed into the exhaust cabinet in winter in extremely cold areas can be solved.

The utility model adopts the air inlet valve and the air outlet valve arranged in the air inlet and the air outlet, and ensures that the surface wind speed in the exhaust cabinet is in a stable effective exhaust range by adjusting the flow of the air inlet valve and the air outlet valve, and the exhaust effect is better compared with the exhaust cabinet in the prior art.

Drawings

Fig. 1 is a schematic view of an overall structure at a certain viewing angle according to an embodiment of the present invention.

FIG. 2 is a schematic side sectional view (with the protection window omitted) of the overall structure of an embodiment of the utility model.

Fig. 3 is a schematic structural diagram of an intake air distribution box according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a left second wind compensation channel assembly according to an embodiment of the present invention.

Fig. 5 is a top cross-sectional view of a left second wind-supplementing duct assembly according to an embodiment of the present invention.

Fig. 6 is a partially enlarged view of a portion a in fig. 5.

Fig. 7 is a schematic structural view of a flow guide member according to an embodiment of the utility model.

In the figure, 1, chamber; 2. a protection window; 3. a side plate; 30. a first air supplement hole; 4. a top plate; 40. a fourth air supplement hole; 5. a column; 50. a seventh air supplement hole; 6. a back plate; 100. a wind supplementing and air inlet device; 110. an air inlet flow distribution box; 111. a base plate; 1111. a third air supplement hole; 112. a flow distribution plate; 1121. a fifth air supplement hole; 113. a fan; 114. an auxiliary heating device; 120. a first air supplement channel; 121. a wind damping plate; 1211. a sixth air supply hole; 130. a second air supplement channel component; 131. a wind-supplementing interlayer; 1311. a second air supplement hole; 132. a flow guide member; 140. an intake valve; 200. an air exhaust device; 210. a gas-collecting hood; 220. an exhaust valve; 300. an air deflector assembly.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present application, it is to be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

It should also be noted that, unless expressly stated or limited otherwise, the terms "disposed" and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

To facilitate understanding of the present invention by those skilled in the art, a specific embodiment of the present invention will be described below with reference to fig. 1 to 7.

As shown in fig. 1-2, the present invention provides a walk-in type exhaust hood, which comprises an exhaust hood main body and a protection window 2 connected with the exhaust hood main body, wherein a chamber 1 with an open front side is formed inside the exhaust hood main body, a top plate 4 is arranged on the top of the exhaust hood main body, side plates 3 are arranged on two sides of the exhaust hood main body, a column 5 is arranged at the front end of each side plate 3, and the walk-in type exhaust hood further comprises an air supplementing and intake device 100 and an exhaust device 200 which are arranged on the exhaust hood main body.

The air supply and intake device 100 comprises an air inlet distribution box 110 mounted on the top plate 4, the top of the air inlet distribution box is connected with an external air inlet pipeline, the bottom of the air inlet distribution box is communicated with a first air supply channel 120, and the left end and the right end of the air inlet distribution box are respectively communicated with a second air supply channel assembly 130. Therefore, when air enters the air inlet shunting box 110, three paths of shunted air can be separated to supply air to the cavity 1, the influence of jet flow on the nonuniformity of the flow field can be reduced, and the air speed of the air outlet is uniform instead of singly supplying air to the cavity 1.

As shown in fig. 3, the intake air diversion box 110 has a structure with a small top and a large bottom, and includes a box body, a bottom plate 111, and a diversion plate 112.

Specifically, the bottom plate 111 is provided with a third air supply hole 1111, and the top plate 4 is provided with a fourth air supply hole 40 at a corresponding position.

Specifically, the flow distribution plate 112 is disposed at the middle position of the bottom plate 111, has an isosceles triangle cross section, and includes a first plate and a second plate forming an included angle with the first plate, and fifth air supplement holes 1121 are respectively formed in the first plate and the second plate. Specifically, the first plate and the second plate face the ports at the left end and the right end of the inlet air distribution box 110, respectively. By arranging the splitter plate 112, air entering the air inlet splitter box 110 can be split more uniformly, and the wind speed is reduced.

In order to deal with the problem that the experimental result is influenced by low-temperature cold air sent into the exhaust cabinet in cold weather, especially in the winter in extremely cold areas, the air inlet shunting box 110 further comprises a fan 113 and an auxiliary heating device 114 arranged below the fan 113, wherein the number of the fan 113 is at least one, and the fan 113 is arranged at the top of the air inlet shunting box 110 and used for blowing air to the auxiliary heating device 114. When the weather is cold, the auxiliary heating device 114 and the fan 113 are turned on, and the fan 113 blows heated air into the cabinet chamber 1 from the inlet air diversion box 110.

In this embodiment, six fans 113 are provided, and are horizontally and uniformly arranged on the top of the inlet air distribution box 110. Two auxiliary heating devices 114 are selected and fixed on the first plate and the second plate respectively. The auxiliary heating device 114 may be a heater in the form of a heating plate.

The first air supply passage 120 is used for supplying air from the top plate 4 to the chamber 1 and is arranged at the top of the chamber 1. Specifically, the first air supplement channel 120 includes an air buffer plate 121, a sixth air supplement hole 1211 is formed on the air buffer plate 121, and the air buffer plate 121 is fixedly disposed at the top of the chamber 1 and forms an included angle with the top plate 4, so as to supplement air into the chamber 1 and the lower portion. The sixth air supplementing holes 1211 are round holes and are uniformly distributed on the air buffering plate 121.

The second air supplying channel assembly 130 is used for supplying air into the cavity 1 from two sides of the side plate 3, is arranged in the cavities at two sides of the exhaust cabinet main body and is communicated with the side plate 3, and a plurality of first air supplying holes 30 are formed in the side plate 3.

The second air supplement channel assembly 130 comprises a plurality of air supplement separation layers 131 and a flow guide member 132 which are longitudinally arranged. One side of the air supplement interlayer 131 close to the side plate 3 is provided with a second air supplement hole 1311, the second air supplement hole 1311 corresponds to the first air supplement hole 30 and is distributed in a staggered mode, and compared with the second air supplement hole 1311, the first air supplement hole 30 is closer to the inside of the chamber 1. The flow guiding member 132 is disposed between the air supplement partition 131 and the side plate 3, and is used for guiding air from the second air supplement hole 1311 into the corresponding first air supplement hole 30 and further into the chamber 1. The bottom of each air supplement interlayer 131 is communicated.

Further, the first air supplement holes 30 are arranged in a plurality of rows which are uniformly arranged, and the number of the second air supplement holes 1311 is the same as that of the first air supplement holes 30. The number of the flow guiding members 132 is equal to the number of the rows of the first air supplement holes 30. The number of the flow guiding elements 132 is multiple to the number of the air supplement interlayers 131. The flow guide member 132 is disposed at an angle to the side plate 3.

The second air supply channel assemblies 130 on the left and right sides have the same structure and are symmetrical to each other, and the air supply directions are all directed to the inside of the chamber 1. Now, the structure of the second air supplement channel assembly 130 on the left side is specifically described, as shown in fig. 4 to 6, the number of the air supplement interlayers 131 arranged on one side of the exhaust cabinet main body is 4, each air supplement interlayer 131 includes two rows of second air supplement holes 1311, each air supplement interlayer 131 corresponds to two air guide members 132, and each air guide member 132 corresponds to one first air supplement. The angle theta between the flow guide 132 and the side plate 3 is 45 degrees. The first and second air supplement holes 30 and 1311 are each provided as a long hole.

As shown in fig. 7, the diversion member 132 is a sheet metal bent member, and is set to be a zigzag structure inclined at an angle of 45 degrees, the top surface of the diversion member 132 is provided with a long hole, the shape of the long hole is the same as that of the second air supplement hole 1311, during installation, the top surface of the diversion member 132 is attached to the side surface of the air supplement interlayer 131 provided with the second air supplement hole 1311, and two flanges of the diversion member are attached to the side plate 3. Each of the baffles surrounds a row of first plectrum holes 30.

As shown in fig. 1, the air supply and intake device 100 further includes an intake valve 140 installed between the intake manifold 110 and the external intake duct for adjusting the intake air amount.

Intake valve 140 may be a butterfly or venturi valve.

The exhaust device 200 includes a gas collecting channel 210 mounted on the top plate 4 and an exhaust valve 220, and the exhaust valve 220 is disposed between the gas collecting channel 210 and an external exhaust duct for adjusting the amount of exhaust air. The gas collecting hood 210 is arranged to collect the discharged gas and accelerate the gas to be discharged out of the laboratory through the exhaust pipeline.

Specifically, in order to further strengthen the air collection effect of airing exhaust, the exhaust hood can be set into a strip semicircular arc-shaped structure with an opening at the bottom, an air outlet used for being connected with an external exhaust pipeline is extended from the upper part of the exhaust hood, lines of the structure are smoother, and the wind resistance pressure can be reduced.

The exhaust valve 220 may be a butterfly or venturi valve.

The side wall of the upright post 5 close to the chamber 1 is provided with a seventh air supplementing hole 50 for assisting air supplementing, the shape of the seventh air supplementing hole 50 can be vertical strip holes, and the number of the strip holes is a plurality of and is longitudinally arranged in a row.

As shown in fig. 2, the exhaust hood further includes an air deflector assembly 300 disposed at the rear of the chamber 1, the air deflector assembly 300 is fixed on the top plate 4 and the back plate 6 by a fixed guiding clamp, and a gap is formed between the bottom of the air deflector assembly 300 and the bottom of the exhaust hood; there is a spacing between the air deflection assemblies 300 and the back plate 6.

The air deflection assembly 300 sequentially comprises a first air deflection plate, a second air deflection plate and a third air deflection plate from top to bottom, a distance exists between the second air deflection plate and the third air deflection plate, and a distance exists between the third air deflection plate and the bottom of the exhaust cabinet. The air suction opening of the air collecting channel 210 is arranged between the top plate 4 and the first air guiding plate. Through setting up aviation baffle subassembly 300, can enough make things convenient for the harmful gas in the cavity 1 to discharge, also can shelter from the inlet scoop of gas collecting channel 210, pleasing to the eye practical again promptly.

The working principle of the embodiment of the utility model is as follows:

outdoor air passes through the air inlet valve 140 through the external air inlet pipeline and enters the air inlet shunting box 110, the air in the air inlet shunting box 110 is divided into three paths, the first path passes through the bottom plate 111 and enters the cavity 1 along the first air supplementing channel 120, the second path and the third path pass through the side plate 3 and enters the cavity 1 along the second air supplementing channel assembly 130, meanwhile, the wind of the seventh air supplementing hole 50 on the upright post 5 is blown into the cavity 1, and harmful gas in the cavity 1 flows to the gas collecting hood 210 along the air deflector assembly 300, passes through the exhaust valve 220 and is exhausted out of the laboratory through the exhaust pipeline.

The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (10)

1. A walk-in exhaust cabinet is characterized in that: the air supply device comprises an exhaust cabinet main body and a protection window (2) connected with the exhaust cabinet main body, wherein a cavity (1) with a front side opening is formed in the exhaust cabinet main body, a top plate (4) is arranged at the top of the exhaust cabinet main body, side plates (3) are arranged on two sides of the exhaust cabinet main body, and the air supply device (100) and the exhaust device (200) are arranged on the exhaust cabinet main body;

the air supplementing and air inlet device (100) comprises an air inlet distribution box (110) which is arranged on the top plate (4), the top of the air inlet distribution box is connected with an external air inlet pipeline, the bottom of the air inlet distribution box is communicated with a first air supplementing channel (120), and the left end and the right end of the air inlet distribution box are respectively communicated with a second air supplementing channel component (130);

the first air supplement channel (120) is used for supplementing air from a top plate (4) to the inside of the chamber (1) and is arranged at the top of the chamber (1); the second air supplementing channel assembly (130) is used for supplementing air into the cavity (1) from two sides of the side plate (3), is arranged in the cavities at two sides of the exhaust cabinet main body and is communicated with the side plate (3), and a plurality of first air supplementing holes (30) are formed in the side plate (3);

the second air supplementing channel assembly (130) comprises a plurality of air supplementing separation layers (131) and a flow guide piece (132) which are longitudinally arranged; one side, close to the side plate (3), of the air supplement interlayer (131) is provided with second air supplement holes (1311), the second air supplement holes (1311) correspond to the first air supplement holes (30) and are distributed in a staggered mode, and compared with the second air supplement holes (1311), the first air supplement holes (30) are closer to the inside of the chamber (1); the flow guide piece (132) is arranged between the air supplementing partition layer (131) and the side plate (3) and used for guiding air to enter the corresponding first air supplementing hole (30) from the second air supplementing hole (1311) and then enter the chamber (1).

2. A walk-in exhaust hood as claimed in claim 1, wherein: the first air supplementing holes (30) are arranged in a plurality of rows which are uniformly distributed, and the number of the second air supplementing holes (1311) is the same as that of the first air supplementing holes (30); the number of the flow guide pieces (132) is equal to the number of the rows of the first air supplement holes (30); the number of the flow guide pieces (132) and the number of the air supplement interlayers (131) are in a multiple relation; the flow guide piece (132) and the side plate (3) are arranged at an included angle.

3. A walk-in exhaust hood as claimed in claim 2, wherein: the number of the air supplementing interlayer (131) arranged on one side of the exhaust cabinet main body is 4, each air supplementing interlayer (131) comprises two rows of second air supplementing holes (1311), each air supplementing interlayer (131) corresponds to two flow guide pieces (132), and each flow guide piece (132) corresponds to one first air supplementing; the included angle between the flow guide piece (132) and the side plate (3) is 45 degrees.

4. A walk-in exhaust hood as claimed in claim 1, wherein the first air supply channel (120) comprises a slow draft plate (121), the slow draft plate (121) is provided with a sixth air supply hole (1211), and the slow draft plate (121) is fixedly disposed at the top of the chamber (1) and forms an included angle with the top plate (4) so as to supply air to the inside and the lower part of the chamber (1).

5. A walk-in exhaust hood as claimed in claim 1, wherein the inlet air distribution box (110) is of a structure with a small top and a big bottom, and comprises:

the bottom plate (111) is provided with a third air supplementing hole (1111), and a fourth air supplementing hole (40) is formed in the corresponding position on the top plate (4);

the flow distribution plate (112) is arranged in the middle of the bottom plate (111), the cross section of the flow distribution plate is in an isosceles triangle shape, the flow distribution plate comprises a first plate and a second plate forming an included angle with the first plate, and fifth air supplement holes (1121) are formed in the first plate and the second plate; the first plate and the second plate respectively face the ports at the left end and the right end of the air inlet flow dividing box (110).

6. A walk-in exhaust hood as claimed in claim 5, wherein: the air inlet flow distribution box (110) further comprises:

the air conditioner comprises a fan (113) and an auxiliary heating device (114) arranged below the fan (113), wherein the number of the fan (113) is at least one, and the fan is arranged at the top of an air inlet distribution box (110) and used for blowing air to the auxiliary heating device (114).

7. A walk-in exhaust hood as claimed in claim 6, wherein: the number of the auxiliary heating devices (114) is two, and the two auxiliary heating devices are respectively and fixedly arranged on the first plate and the second plate.

8. A walk-in exhaust hood according to any one of claims 1 to 7, wherein the air supply and intake device (100) further comprises an air intake valve (140) disposed between the air intake branch box (110) and the external air intake duct for adjusting the intake air volume; exhaust device (200) are including setting up gas collecting channel (210) and discharge valve (220) on roof (4), discharge valve (220) set up between gas collecting channel (210) and outside exhaust duct for adjust the exhaust volume.

9. A walk-in exhaust hood as claimed in claim 8, wherein: the gas collecting hood (210) is of a long-strip semi-arc structure with an opening at the bottom, and an exhaust port for connecting an external exhaust pipeline extends from the upper part of the gas collecting hood.

10. A walk-in exhaust hood as claimed in claim 8, wherein: the intake valve (140) is configured as a butterfly or venturi valve; the exhaust valve (220) is configured as a butterfly valve or a venturi valve.

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