CN212821668U - Air supplement type ventilation cabinet - Google Patents

Abstract

The utility model relates to a wind-supplementing type fume hood, which comprises a workbench, side plates, a top plate, a back plate and a stand column, wherein the top plate is provided with an air outlet for exhausting gas generated in a cavity, and the workbench is provided with a working panel; the ventilating cabinet also comprises an air supplementing assembly, the air supplementing assembly comprises a lower air box fixedly connected to the front side of the workbench, a lower air inlet pipe arranged on the lower air box and a fan connected with the lower air inlet pipe, air blown out by the fan enters the lower air box through the lower air inlet pipe, an air outlet hole is formed in the lower air box and faces the inside of the cavity; the air supplement assembly further comprises an upper air box arranged on the top plate and a front air box arranged on the front side of the top plate. The utility model discloses can blow to the cavity is inside, the wind of insufflating mixes together with the wind of air exhauster extraction, reduces the amount of wind of air exhauster extraction to reach energy-conserving effect, and can effectually prevent the gas leakage in the cavity.

Description

Air supplement type ventilation cabinet

Technical Field

The utility model belongs to the technical field of laboratory ventilation equipment's technique and specifically relates to a mend wind type fume chamber is related to.

Background

The open laboratory bench is used basically in current chemical experiment process, and when carrying out the chemical experiment, produces some poisonous and harmful substance easily, and current laboratory bench can not carry out fine protection, and long-term operation experiment can be to the healthy harm of experimenter.

Chinese patent publication No. CN105921479A discloses a fume chamber, including left side board, right side board, air exhauster, baffle, storage tank, workstation, glass door and guide plate, the both ends at the workstation are installed respectively to left side board and right side board, and the baffle is installed between left side board and right side board, and the both sides of baffle are equipped with glass door and guide plate respectively, and the end of breathing in of air exhauster stretches into in the cavity, and the exhaust end of air exhauster stretches out outside the cavity, and storage tank fixed mounting is in the bottom of workstation. When the fume hood in the above-mentioned patent is used, the toxic gas that produces in the experiment is taken away to the air exhauster.

The above prior art solutions have the following drawbacks: when the exhaust fan extracts the air in the cavity, the air pressure in the cavity changes, so that the outside air can enter from the front opening of the fume hood. However, in actual operation, all the air entering the chamber of the fume hood is extracted by the exhaust fan, so that the exhaust fan needs to consume a large amount of energy during extraction.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims at providing a mend wind type fume chamber, it can blow to the cavity is inside, and the wind of insufflating mixes together with the wind of air exhauster extraction, under the unchangeable circumstances of volume of airing exhaust, reduces the amount of wind of air exhauster extraction to reach energy-conserving effect.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

a wind supplementing type fume hood comprises a workbench, side plates, a top plate, a back plate and upright posts, wherein an air outlet for exhausting gas generated in a cavity is formed in the top plate, and a working panel is arranged on the workbench;

the ventilating cabinet also comprises an air supplementing assembly, the air supplementing assembly comprises a lower air box fixedly connected to the front side of the workbench, a lower air inlet pipe arranged on the lower air box and a fan which is connected with the lower air inlet pipe and blows air into the lower air inlet pipe, the air blown out by the fan enters the lower air box through the lower air inlet pipe, a lower air outlet hole used for discharging the air is formed in the lower air box, and the lower air outlet hole faces the inside of the cavity;

the air supplementing assembly further comprises an upper air box arranged on the top plate and a front air box arranged on the front side of the top plate;

the upper air box is arranged on the lower side of the top plate and is fixedly connected with the top plate, an upper air inlet pipe for communicating the fan with the upper air box is fixedly connected between the upper air box and the air inlet box, and a plurality of upper air outlet holes for discharging air in the upper air box are formed in the upper air box; the upper air outlet is arranged at one side of the upper air box facing the back plate;

the front air box is arranged on the front side of the top plate and is fixedly connected with the side plate, a front air pipe for communicating the fan with the front air box is fixedly connected between the front air box and the air inlet box, and a plurality of front air outlet holes for discharging gas in the front air box are formed in the front air box; the front air outlet is arranged on one side of the front air box facing the back plate;

the front air box comprises a connecting plate fixedly connected with the front air pipes, the connecting plate is fixedly connected with two front air pipes, the connecting plate is vertically and fixedly connected with a connecting frame, the connecting frame is fixedly connected with a mounting plate, and the front air box is arranged in a connecting plate-connecting frame-mounting plate mode;

the front air outlet is formed in the connecting plate and arranged on the lower side of the connecting plate, and the front air inlet pipe is connected to the upper side of the connecting plate.

By adopting the technical scheme, when a worker performs an experiment in the fume hood, the fan is started, and blown air is respectively blown into the lower air box through the lower air inlet pipe and blown out from the lower air box; the air enters the upper air box through the upper air inlet pipe and is blown out of the upper air box; the air is discharged from the front air box through the front air inlet pipe, so that air is blown into the cavity of the fume hood, and when the discharged air volume is consistent, the air draft volume of the exhaust fan is reduced, and the energy-saving effect is achieved.

The present invention may be further configured in a preferred embodiment as: the lower side of the connecting frame is fixedly connected with an arc-shaped air inducing plate, and the bending direction of the arc-shaped air inducing plate faces the back plate.

Through adopting above-mentioned technical scheme, when wind blows the guard gate on, certain bounce-back can appear, when the partial air current of bounce-back flows to the arc induced air board on, the arc induced air board blocks the air current for the air current flows along the medial surface of arc induced air board, thereby changes the flow direction of bounce-back air current.

The present invention may be further configured in a preferred embodiment as: and the front air box is fixedly connected with a partition plate which divides the front air box into two air cavities, and each air cavity corresponds to one front air inlet pipe.

By adopting the technical scheme, the air entering the front air box from the two front air inlet pipes cannot interfere with each other.

The present invention may be further configured in a preferred embodiment as: the front air box is fixedly connected with an L-shaped plate, the L-shaped plate is divided into a transverse plate and a vertical plate, and the L-shaped plate is fixedly connected with the connecting plate, the mounting plate and the connecting frame;

the transverse plate and the vertical plate are provided with through holes.

Through adopting above-mentioned technical scheme, after in the air-supply line got into the front wind box in the front in wind follow, earlier with L template contact, under the effect of through-hole on the L template, the wind that gets into in the air supply line before takes place the reposition of redundant personnel, wind after the reposition of redundant personnel passes diaphragm and riser respectively after, joins air outlet department in the front, wind is discharged from two directions of violently erecting after the reposition of redundant personnel and flows to air outlet department before to flow through whole wind cavity, prevent that the wind in the wind cavity from taking place the vortex at the edge of linking frame and piling up.

The present invention may be further configured in a preferred embodiment as: and the L-shaped plate is fixedly connected with a wind shield.

Through adopting above-mentioned technical scheme, under the effect of deep bead, prevent that the wind after the reposition of redundant personnel from converging and join before preceding air outlet department, prevent the turbulent flow that two wind formed.

The present invention may be further configured in a preferred embodiment as: fixedly connected with strains the wind board in the preceding bellows, strain and seted up a plurality of on the wind board and strain the wind hole, strain and have the clearance between wind board and the link frame.

By adopting the technical scheme, the wind entering the front wind box can fill all positions of the front wind box, reduces the butt joint of eddy currents, and can stabilize the wind under the action of the wind filtering plate.

The present invention may be further configured in a preferred embodiment as: the upper side of the top plate is fixedly connected with an air inlet box communicated with the two front air inlet pipes, and the air inlet box is fixedly connected with an induced air pipe connected with a fan; the lower air inlet pipe is communicated with the upper air inlet pipe and the interior of the air inlet box.

Through adopting above-mentioned technical scheme, the air inlet department with two air supply pipes before gathers together, lets the staff's of being convenient for installation and arrangement, lets the air supply pipe before on the roof arrange more neatly. And the lower air inlet pipe and the upper air inlet pipe are converged on the air inlet box, so that the gas transmission can be facilitated.

The present invention may be further configured in a preferred embodiment as: a cavity is arranged in the side plate, and the lower air inlet pipe penetrates into the cavity from the top plate and penetrates out of the cavity.

By adopting the technical scheme, most of the lower air inlet pipe is positioned in the cavity, so that the concealment of the lower air inlet pipe is improved, and the extra space occupied by the lower air inlet pipe is reduced.

To sum up, the utility model discloses a following at least one useful technological effect:

1. the air supplementing assembly is arranged to blow air into the cavity of the ventilation cabinet, so that the blown air and the air extracted by the exhaust fan can be mixed together, and the air extracted by the exhaust fan is reduced under the condition of unchanged air exhaust amount, so that the effect of energy conservation is achieved;

2. by arranging the air supplement assembly, harmful gas in the cavity can be effectively prevented from leaking from the front side of the fume hood;

3. through setting up the air inlet case, both can save space, gather the air inlet source of going up bellows, bellows and preceding bellows, also can blow into the cavity with the wind that goes up bellows, bellows and preceding bellows required.

Drawings

FIG. 1 is a schematic view of a fume hood according to the present embodiment;

FIG. 2 is a schematic view of a cavity reserved on the side plate in the present embodiment;

fig. 3 is a schematic position diagram of an air supplement assembly disposed on the ventilation cabinet in this embodiment;

FIG. 4 is a schematic connection diagram of four bellows of the air supply assembly of this embodiment;

FIG. 5 is a schematic view of a front windbox in the present embodiment;

FIG. 6 is a schematic view showing the inside of a front windbox in the present embodiment;

FIG. 7 is a schematic view of a lower windbox in the present embodiment;

FIG. 8 is a schematic view of the upper windbox of the present embodiment.

In the figure, 1, a workbench; 11. a working panel; 2. a side plate; 21. a cavity; 3. a top plate; 4. a back plate; 5. a column; 6. a wind supplementing component; 61. a front bellows; 6101. a connecting plate; 6102. a connecting frame; 6103. mounting a plate; 6104. a front air outlet hole; 6105. an arc induced draft plate; 6106. a partition plate; 6107. an L-shaped plate; 6108. a transverse plate; 6109. a vertical plate; 6110. a through hole; 6111. a wind deflector; 6112. a wind filtering plate; 6113. a wind filtering hole; 62. an air supply duct; 63. an air inlet box; 64. an induced draft pipe; 65. a lower bellows; 66. an upper air box; 67. a lower air inlet pipe; 68. a lower air outlet hole; 69. an upper air inlet pipe; 610. an upper air outlet hole; 7. a protective door; 8. a chamber; 9. an air outlet.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, for the utility model discloses a mend wind type fume chamber, including workstation 1, curb plate 2, roof 3, backplate 4, stand 5 and mend wind subassembly 6. A work panel 11 is arranged on the work table 1.

Two side plates 2 are arranged on two sides of the workbench 1, a top plate 3 is installed between the two side plates 2, and the top plate 3 is arranged on the upper side of the side plates 2 and fixedly connected with the side plates 2. A protective door 7 is installed on the front side of the top plate 3, the back plate 4 is arranged on the rear side of the top plate 3, and the side plate 2, the top plate 3, the back plate 4, the working panel 11 and the protective door 7 enclose a chamber 8.

An air outlet 9 for exhausting the gas generated in the cavity 8 is formed in the top plate 3 in a penetrating mode, the air outlet 9 is connected with an exhaust fan, and when the exhaust fan operates, the exhaust fan extracts the gas from the inside of the cavity 8 through the air outlet 9, so that the gas in the cavity 8 is exhausted conveniently.

Referring to fig. 3 and 4, the air supply assembly 6 includes a front air box 61 fixedly connected between the two side plates 2, a front air duct 62 mounted on the front air box 61, and a blower connected to the front air box 63 and blowing air into the front air box 61, and the air blown by the blower enters the front air box 63 through the front air duct 62. And the forward bellows 63 is disposed outside the guard door 7.

Referring to fig. 5 and 6, the front bellows 61 includes a connecting plate 6101 fixedly connected to the front bellows 62, and two front bellows 62 are fixedly connected to the connecting plate 6101, and the connecting plate 6101 is disposed between the two side plates 2 and fixedly connected to the two side plates 2. Wherein two front ventilation ducts 62 are arranged on both sides of the connecting plate 6101. Also, when the connecting plate 6101 is installed between the two side plates 2, two front air ducts 62 are arranged on the top of the connecting plate 6101. The connecting plate 6101 is a rectangular plate.

A connecting frame 6102 is vertically and fixedly connected to the connecting plate 6101, a mounting plate 6103 is fixedly connected to the connecting frame 6102, the front bellows 61 is arranged in the form of the connecting plate 6101, the connecting frame 6102 and the mounting plate 6103, and the connecting plate 6101, the connecting frame 6102 and the mounting plate 6103 are fixedly connected to form a box.

A plurality of front air outlet holes 6104 for discharging air entering the front air box 61 are opened on the connecting plate 6101, and the plurality of front air outlet holes 6104 are arranged at the lower side of the connecting plate 6101 and face the back plate 4.

When the fan is started, wind blown out by the fan enters the front air box 61 through the front air inlet pipe 62, and after the wind enters the front air box 61, the front air outlet 6104 on the whale connecting plate 6101 is discharged, so that the wind is discharged from the front air outlet 6104 on the connecting plate 6101 to the inside of the chamber 8. When the protective door 7 is opened to block the wind exhausted from the front air outlet 6104, the wind blows on the glass of the protective door 7, and the temperature on the glass of the protective door 7 is kept constant. After blowing to the guard gate 7, along the decline of guard gate 7, fall behind the front side of workstation 1, under the twitch of air exhauster, get into in cavity 8.

When wind blows the guard gate 7, certain bounce can occur, and partial airflow flows to one side far away from the cavity 8, in order to reduce the airflow after the bounce, an arc-shaped air guide plate 6105 is fixedly connected to the lower side of the connecting frame 6102, the bending direction of the arc-shaped air guide plate 6105 faces the back plate 4, when the rebounded partial airflow flows to the arc-shaped air guide plate 6105, the arc-shaped air guide plate 6105 blocks the airflow, so that the airflow flows along the inner side face of the arc-shaped air guide plate 6105, and the flowing direction of the rebounded airflow is changed.

A separation plate 6106 which divides the front air box 61 into two air chambers is fixedly connected in the front air box 61, the separation plate 6106 is vertically arranged, the separation plate 6106 is fixedly connected with the connecting plate 6101, the connecting frame 6102 and the mounting plate 6103, and each air chamber corresponds to one front air duct 62, so that the winds entering the front air box 61 from the two front air ducts 62 do not interfere with each other.

In order to enable wind energy entering the wind cavity to flow more regularly, an L-shaped plate 6107 is fixedly connected in the wind cavity, the L-shaped plate 6107 is divided into a horizontal plate 6108 and a vertical plate 6109, the horizontal plate 6108 is perpendicular to the vertical plate 6109, and the L-shaped plate 6107 is fixedly connected at the corner of the connecting frame 6102 to surround the mouth of the front air duct 62. The L-shaped plate 6107 is fixedly connected to the connecting plate 6101, the mounting plate 6103 and the connecting frame 6102. The periphery of the horizontal plate 6108 is fixedly connected to the vertical plate 6109, the connecting plate 6101, the mounting plate 6103, and the connecting frame 6102, and the periphery of the vertical plate 6109 is fixedly connected to the horizontal plate 6108. The connecting plate 6101, the mounting plate 6103, and the connecting frame 6102 are fixedly connected. The L-shaped plate 6107 seals the connection between the connection plate 6101, the mounting plate 6103, and the connection frame 6102. Through holes 6110 are arranged on the horizontal plate 6108 and the vertical plate 6109.

A wind shield 6111 is fixedly connected to the L-shaped plate 6107, and the wind shield 6111 is fixedly connected to the connecting position of the horizontal plate 6108 and the vertical plate 6109. And the wind shield 6111 is arranged to be an arc-shaped plate, the wind shield 6111 is fixedly connected with the connecting plate 6101 and the mounting plate 6103, and the wind shield 6111 is bent towards one side far away from the separation plate 6106.

After wind enters the front air box 61 from the front air inlet pipe 62, the wind firstly contacts the L-shaped plate 6107, under the action of the through hole 6110 on the L-shaped plate 6107, the wind entering the front air inlet pipe 62 is divided, the divided wind respectively passes through the horizontal plate 6108 and the vertical plate 6109 and then converges at the front air outlet 6104, and the wind flows to the front air outlet 6104 from the horizontal and vertical directions after being divided and then is discharged, thereby flowing through the whole air cavity and preventing the wind in the air cavity from generating vortex accumulation at the corners of the connecting frame 6102.

Under the action of the wind shield 6111, the shunted wind is prevented from converging before the front wind outlet 6104, and the turbulent flow formed by the two winds is prevented.

The front air box 61 is fixedly connected with an air filtering plate 6112, the air filtering plate 6112 is provided with a plurality of air filtering holes 6113, the length of the air filtering plate 6112 is smaller than that of the mounting plate 6103, and the air filtering plate 6112 is not in contact with the connecting frame 6102. The air filtering plate 6112 is fixedly connected with the separation plate 6106 and the air baffle 6111.

The wind passing through the vertical plate 6109 passes through the wind filtering plate 6112, the wind passing through the horizontal plate 6108 passes through the wind filtering plate 6112 for the most part, flows to the corner of the connecting frame 6102 for the less part, and finally flows to the front wind outlet 6104.

Referring to fig. 3 and 4, an air inlet box 63 is installed on the top plate 3, the air inlet box 63 is fixedly connected to the upper side of the top plate 3, an air guiding pipe 64 communicated with the inside of the air inlet box 63 is fixedly connected to the upper side of the air inlet box 63, and the air guiding pipe 64 is connected to a fan so that air blown by the fan can enter the air inlet box 63 through the air guiding pipe 64. The other end of the front wind box 62 is fixedly connected with the wind inlet box 63 and is communicated with the interior of the wind inlet box 63, so that the wind inlet box 63 is communicated with the front wind box 61 through the front wind box 62.

After entering the air inlet box 63, the air blown by the blower fan enters the front air box 61 from the air inlet box 63 along the front air duct 62. Through setting up air inlet box 63, put together the air inlet department of two preceding air pipes 62, let the installation and the arrangement of the staff of being convenient for, let preceding air pipe 62 on roof 3 arrange more neatly.

The supplementary air assembly 6 further comprises a lower air box 65 arranged on the table 1 and a front air box 61 on the top plate 3.

Specifically, referring to fig. 4 and 7, the lower air box 65 is disposed at the front side of the workbench 1 and fixedly connected to the workbench 1, and a lower air inlet pipe 67 is fixedly connected between the lower air box 65 and the air inlet box 63, the lower air inlet pipe 67 is used for communicating the air inlet box 63 with the lower air box 65, a plurality of lower air outlet holes 68 for discharging air in the lower air box 65 are formed in the lower air box 65, the direction of the lower air outlet holes 68 faces the back plate 4, so that the air discharged from the lower air outlet holes 68 is blown into the cavity 8, and the air can be blown into the cavity 8 from the lower part of the cavity 8 or blown onto the surface of the workbench 1 and discharged from the air outlet 9. A cavity 21 is formed in the side panel 2, and a lower air inlet duct 67 is inserted into the cavity 21 from the top panel 3, and is extended out of the cavity 21 to communicate with the lower air box 65, so that most of the lower air inlet duct 67 is positioned in the cavity 21, improving concealment of the lower air inlet duct 67 and reducing an additional space occupied by the lower air inlet duct 67. The side plates 2 are formed by splicing a plurality of sectional materials, and cavities 21 are reserved in the splicing process.

Referring to fig. 4 and 8, the upper bellows 66 is disposed on the lower side of the top plate 3, fixedly connected to the top plate 3, and located on the front side of the chamber 8. And go up air inlet pipe 69 between last bellows 66 and the air inlet case 63 fixedly connected with, it is used for communicating air inlet case 63 with last bellows 66 to go up air inlet pipe 69, go up and seted up a plurality of on the bellows 66 with last exhaust-air outlet 610 of gas outgoing in last bellows 66, go up exhaust-air outlet 610 combustion gas and blow in the cavity 8, both can blow to the inside of cavity 8 from the upper portion of cavity 8, also can blow to the harmful gas that rises to roof 3 department, prevent that gas from piling up in roof 3 department. The upper air inlet pipe 69 is fixedly connected to a lower side of the air inlet box 63 and is fixedly connected to an upper side of the upper air box 66. The upper air outlet 610 is formed on one side of the upper air box 66 facing the back plate 4.

The implementation principle of the embodiment is as follows: when a worker performs an experiment in the fume hood, the fan is started, and blown air is blown into the lower air box 65 through the lower air inlet pipe 67 and blown out of the lower air box 65 respectively; enters the upper air box 66 through the upper air inlet pipe 69 and is blown out of the upper air box 66; enter the front bellows 61 through the front air duct 62, and are discharged from the front bellows 61, so that air is blown into the chamber 8 of the fume hood, and when the discharged air volume is consistent, the air draft volume of the exhaust fan is reduced, and the energy-saving effect is achieved.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. The utility model provides a mend wind type fume chamber, includes workstation (1), curb plate (2), roof (3), backplate (4) and stand (5), offer on roof (3) and be used for gas outgoing's that produces in cavity (8) air exit (9), its characterized in that: a working panel (11) is arranged on the working table (1);

the ventilating cabinet further comprises an air supplementing assembly (6), the air supplementing assembly (6) comprises a lower air box (65) fixedly connected to the front side of the workbench (1), a lower air inlet pipe (67) installed on the lower air box (65), and a fan which is connected with the lower air inlet pipe (67) and blows air into the lower air inlet pipe (67), the air blown out by the fan enters the lower air box (65) through the lower air inlet pipe (67), a lower air outlet hole (68) used for discharging the air is formed in the lower air box (65), and the lower air outlet hole (68) faces the inside of the cavity (8);

the air supplementing assembly (6) further comprises an upper air box (66) arranged on the top plate (3) and a front air box (61) arranged on the front side of the top plate (3);

the upper air box (66) is arranged at the lower side of the top plate (3) and is fixedly connected with the top plate (3), an upper air inlet pipe (69) for communicating the fan with the upper air box (66) is fixedly connected between the upper air box (66) and the air inlet box (63), and a plurality of upper air outlet holes (610) for discharging gas in the upper air box (66) are formed in the upper air box (66); the upper air outlet hole (610) is formed in one side, facing the back plate (4), of the upper air box (66);

the front air box (61) is arranged on the front side of the top plate (3) and is fixedly connected with the side plate (2), a front air pipe (62) for communicating the fan with the front air box (61) is fixedly connected between the front air box (61) and the air inlet box (63), and a plurality of front air outlet holes (6104) for discharging gas in the front air box (61) are formed in the front air box (61); the front air outlet hole (6104) is arranged at one side of the front air box (61) facing the back plate (4);

the front air box (61) comprises a connecting plate (6101) fixedly connected with front air ducts (62), the connecting plate (6101) is fixedly connected with two front air ducts (62), the connecting plate (6101) is vertically and fixedly connected with a connecting frame (6102), the connecting frame (6102) is fixedly connected with a mounting plate (6103), and the front air box (61) is arranged in the form of the connecting plate (6101) -the connecting frame (6102) -the mounting plate (6103);

the front air outlet hole (6104) is formed in the connecting plate (6101) and is arranged on the lower side of the connecting plate (6101), and the front air inlet pipe (62) is connected to the upper side of the connecting plate (6101).

2. The air supplement type fume hood according to claim 1, wherein: the lower side of the connecting frame (6102) is fixedly connected with an arc-shaped air guide plate (6105), and the bending direction of the arc-shaped air guide plate (6105) faces the back plate (4).

3. The air supplement type fume hood according to claim 1, wherein: the front air box (61) is fixedly connected with a partition plate (6106) which divides the front air box (61) into two air cavities, and each air cavity corresponds to one front air inlet pipe (62).

4. The air supplement type fume hood according to claim 1, wherein: an L-shaped plate (6107) is fixedly connected in the front air box (61), the L-shaped plate (6107) is divided into a transverse plate (6108) and a vertical plate (6109), and the L-shaped plate (6107) is fixedly connected with a connecting plate (6101), a mounting plate (6103) and a connecting frame (6102);

through holes (6110) are formed in the transverse plate (6108) and the vertical plate (6109).

5. The air supplement type fume hood according to claim 4, wherein: and the L-shaped plate (6107) is fixedly connected with a wind shield (6111).

6. The air supplement type fume hood according to claim 1, wherein: the wind filtering plate (6112) is fixedly connected in the front wind box (61), a plurality of wind filtering holes (6113) are formed in the wind filtering plate (6112), and a gap exists between the wind filtering plate (6112) and the connecting frame (6102).

7. The air supplement type fume hood according to claim 1, wherein: an air inlet box (63) communicated with the two front air inlet pipes (62) is fixedly connected to the upper side of the top plate (3), and an air guide pipe (64) connected with a fan is fixedly connected to the air inlet box (63); the lower air inlet pipe (67) is communicated with the upper air inlet pipe (69) and the interior of the air inlet box (63).

8. The air supplement type fume hood according to claim 1, wherein: a cavity (21) is arranged in the side plate (2), and a lower air inlet pipe (67) penetrates into the cavity (21) from the top plate (3) and penetrates out of the cavity (21).

Images