CN113578910B

CN113578910B - Low energy consumption air supplement type laboratory fume chamber

Info

Publication number: CN113578910B
Application number: CN202111000652.1A
Authority: CN
Inventors: 王叶梅
Original assignee: Qingdao Zhongke Hanway Lab Equipment Science And Technology Co ltd
Current assignee: Qingdao Zhongke Hanway Lab Equipment Science And Technology Co ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2024-07-23
Anticipated expiration: 2041-08-30
Also published as: CN113578910A

Abstract

The invention discloses a low-energy-consumption air supplementing type laboratory fume chamber, which comprises a fume chamber main body and a protective window, wherein a chamber with an opening at the front side is formed in the fume chamber main body, a workbench is arranged at the lower part of the chamber, a top plate is arranged at the top of the fume chamber main body, an exhaust structure is arranged on the top plate, side plates are arranged on two sides of the fume chamber main body, the front end of each side plate is connected with a stand column, a first air supplementing opening is formed in the side wall of each stand column facing the direction of the chamber, air supplementing wings are arranged on the two sides of each first air supplementing opening facing the inner side of the side wall, and the front end of each stand column is of an arc structure; the protection window sets up fume chamber main part front end, and with stand swing joint, protection window bottom and top set up to the circular arc structure towards the cavity direction. According to the invention, through optimizing the structure of the fume hood, the side auxiliary air inlet effect is increased, harmful gas leakage is prevented, and the face air speed is reduced, so that the indoor air exhaust quantity is reduced, and the whole energy consumption of a laboratory is reduced.

Description

Low energy consumption air supplement type laboratory fume chamber

Technical Field

The invention relates to the technical field of laboratory ventilation equipment, in particular to a low-energy-consumption air supplementing type laboratory ventilation cabinet.

Background

Laboratory ventilation is an integral part of laboratory design. In order for laboratory staff not to inhale or throat some toxic, pathogenic or unidentified chemicals and organisms, the laboratory should be well ventilated. To prevent the absorption of some vapors, gases and particulates (smoke, soot, dust and aerosols), the contaminants must be removed by means of a fume hood, hood or local ventilation.

Fume hoods are the most commonly used local exhaust equipment in laboratories, and in general, the top of the fume hood is provided with an air exhaust device, so that toxic and harmful gases can be exhausted outdoors. The side of the fume hood facing the operator is provided with a visual window which slides up and down. When the visual window is used, the visual window is pulled down to leave a certain space with the table top of the operation table, so that an operator can operate on the operation table. After the experimental reaction is stable, the visual window is pulled down, and the lower end of the visual window is abutted to the table top of the operation table.

The standards for measuring the laboratory fume hood are to satisfy: the harmful gas cannot overflow and generate turbulent flow in the cabinet. The ventilation quantity of the laboratory fume hood is provided with a certain index, and the ventilation quantity of a single fume hood is generally 800-1000 m ³/T. The wind speed of the fume hood takes the measured value of the section wind speed as the detection basis, and the door of the fume hood is placed at a position about 15CM away from the tabletop during detection. In general, the inlet wind speed is 0.4m/s-0.6m/s, and the gas in the cabinet can be well controlled. Typical fume hood use is where an operator stands in front of the fume hood and reaches into the fume hood for experimental operation. The air flow entering the fume hood at this time will create a swirling air flow around the operator, thereby causing the air within the hood to escape. The greater the inlet wind speed, the stronger the resultant swirling airflow.

The existing fume hood controls the inlet air speed within 0.4m/s-0.6m/s by adopting a large-air-volume air extractor, and discharges toxic and harmful gases outdoors, so that when an operator walks around or operates the fume hood, the interference air flow is small, laboratory gases are not leaked outside, but the method has certain defects, the energy consumption of the fume hood is high, and the energy consumption of the laboratory is further increased through the fact that the indoor cold air is extracted outdoors especially in summer through actual use.

Because compared with the use condition of a common air conditioner, the cold energy consumption of a laboratory caused by exhaust air is remarkable, and the calculation formula is as follows: (outdoor temperature air enthalpy-indoor temperature air enthalpy) ×air volume×air density=energy consumption (joule) according to the formula, each 1000m ³ air volume discharged will lose 16kw of cold and consume 5kw of energy. And a certain amount of air is discharged, and the energy required by the exhaust fan is compared with the energy required by the cooling capacity consumed by the air conditioner for supplementing exhaust air, wherein the energy required by the air conditioner is 10 times that of the exhaust fan. Therefore, controlling the exhaust air volume is a key for reducing the energy consumption, and finally is embodied on an air conditioning system.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides the low-energy-consumption air supplementing type laboratory ventilation cabinet, which increases the side auxiliary air inlet effect by optimizing the structure of the ventilation cabinet, prevents harmful gas leakage and reduces the face air speed, thereby reducing the indoor air discharge quantity and the whole energy consumption of a laboratory.

The technical scheme of the invention is as follows:

The invention provides a low-energy-consumption air supplementing type laboratory fume chamber, which comprises a fume chamber main body and a protective window connected with the fume chamber main body, wherein a chamber with an opening at the front side is formed in the fume chamber main body, a workbench is arranged at the lower part of the chamber, a top plate is arranged at the top of the fume chamber main body, an air exhaust structure is arranged on the top plate, side plates are arranged at two sides of the fume chamber main body, the front ends of the side plates are connected with upright posts,

A first air supply port is formed in the side wall of the upright post facing the chamber direction, air supply wings are arranged on the two sides of the first air supply port facing the inner side of the side wall, and the front end of the upright post is of an arc structure;

the protection window sets up fume chamber main part front end, and with stand swing joint, protection window bottom and top orientation the cavity direction sets up to the circular arc structure.

Further, the number of the air supplementing wings is two, the air supplementing wings are arranged in parallel, an included angle is formed between the air supplementing wings and the side wall, and the extending direction of the air supplementing wings points to the front end of the upright post; the number of the first air supply openings is a plurality of vertical columns which are longitudinally distributed.

Further, an air inlet box is arranged below the workbench, a fan is arranged at the rear part of the air inlet box, the front part of the air inlet box is provided with an arc inclined panel, a first air outlet hole for discharging air is formed in the arc inclined panel, and the first air outlet hole faces the inside of the cavity;

And a second air supplementing opening is arranged between the bottom of the protective window and the arc inclined panel.

Further, the protection window is set to be a glass window and can be pushed and pulled up and down along the upright post, the protection window comprises an upper frame, a lower frame, a side frame and a handle assembly arranged at the lower part of the lower frame, the handle assembly comprises a first handle, a limit column arranged in the first handle and a handle control button for controlling the limit column to stretch, and the handle control button is arranged on the first handle; the side surfaces of the upper frame and the lower frame, which face the chamber, are arranged in an arc structure; the section of the handle component is integrally in a half crescent cambered surface structure with a large upper part and a small lower part; and a third air supplementing port is arranged between the handle assembly and the lower frame.

Further, a limiting structure for limiting the up-and-down push-pull position of the protection window is arranged on the front end face of the upright post, and the limiting structure is a semicircular structure with a small upper part and a large bottom.

Further, the protective window further comprises a first glass door and a second glass door, and the first glass door and the second glass door can be pushed and pulled left and right.

Further, a side plate mounting groove is formed in the rear end of the upright post, and the side plate is inserted into the side plate mounting groove and connected with the upright post in a plugging mode;

The locker is installed to fume chamber main part lower part.

Further, the fume chamber further comprises an air deflector assembly arranged at the rear part of the chamber, the air deflector assembly is fixed with the top plate and the back plate through fixed guide clamps, and a space exists between the bottom of the air deflector assembly and the workbench; and a space exists between the air deflector assembly and the backboard.

Further, the air deflector assembly comprises a first air deflector, a second air deflector and a third air deflector from top to bottom in sequence, a space exists between the second air deflector and the third air deflector, and a space exists between the third air deflector and the workbench.

Further, the air inlet box further comprises a slow air plate arranged between the fan and the arc inclined panel.

The beneficial effects achieved by the embodiment of the invention are as follows:

According to the embodiment of the invention, the first air supply port and the air supply wings are added on the upright post, so that the air supply effect can be improved, meanwhile, the air supply wings have a certain guiding effect on the entering of external air, so that gentle air is supplied, the air flow disturbance in the internal cavity is reduced, and finally the energy consumption is reduced. The bottom and the top of the protection window are arranged to be arc structures towards the chamber, so that the air supplementing effect can be improved, external wind can smoothly enter the chamber, and meanwhile, the inside harmful gas can be prevented from overflowing.

According to the embodiment of the invention, the second air supply port is arranged between the bottom of the protective window and the arc inclined panel, and the first air supply port and the second air supply port are combined for use, so that the air supply effect is further improved, external wind can smoothly enter the cavity, and meanwhile, the internal harmful gas can be prevented from overflowing.

According to the embodiment of the invention, the third air supply port is arranged between the handle assembly of the protective window and the lower frame of the glass window, and the first air supply port, the second air supply port and the second air supply port are matched for use, so that the air supply effect is further improved, external wind can smoothly enter the cavity, and meanwhile, the harmful gas in the cavity can be prevented from overflowing; therefore, the air pressure in the cavity is kept stable and balanced, the exhauster does not need to run at high speed all the time, the working energy consumption is reduced, and the whole energy consumption of a laboratory is further reduced.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention (omitting the protection window).

FIG. 2 is a schematic overall structure of an embodiment of the present invention.

Fig. 3 is a schematic structural view of a column according to an embodiment of the present invention.

Fig. 4 is a schematic structural view of a column according to an embodiment of the present invention.

FIG. 5 is a schematic side cross-sectional view of an embodiment of the present invention.

Fig. 6 is an enlarged schematic view of a portion of fig. 5 at a.

In the figure, 100, a fume hood body; 110. a work table; 120. a top plate; 130. an exhaust structure; 140. a side plate; 150. a column; 151. a first air supply port; 152. the air supplementing wings; 153. a side plate mounting groove; 154. a chute; 160. an air inlet box; 161. arc inclined panel; 1611. a first air outlet hole; 162. a wind retarding plate; 1621. a second air outlet hole; 170. a second air supply port; 180. a limit structure; 190. a back plate; 200. a protective window; 210. an upper frame; 220. a lower frame; 230. a side frame; 240. a handle assembly; 241. a first handle; 242. a limit column; 243. a handle control button; 244. a first glass door; 245. a second glass door; 246. a connecting piece; 250. a third air supply port; 300. a blower; 400. an air deflector assembly; 410. a first air deflector; 420. a second air deflector; 430. a third air deflector; 500. fixing a diversion clamp; 600. and (5) storing a cabinet.

Detailed Description

In order to facilitate understanding of the present invention to those skilled in the art, a specific embodiment of the present invention will be described below with reference to the accompanying drawings.

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings, in which it is evident that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. 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" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements 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.

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 herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.

In order to facilitate understanding of the present invention by those skilled in the art, specific embodiments of the present invention will be described below with reference to FIGS. 1 to 6.

As shown in fig. 1-2, the invention provides a low-energy consumption air supplementing type laboratory fume chamber, which comprises an air ventilating cabinet main body 100 and a protection window 200 connected with the air ventilating cabinet main body 100, wherein a chamber with an opening at the front side is formed in the air ventilating cabinet main body 100, a workbench 110 is arranged at the lower part of the chamber, a top plate 120 is arranged at the top of the air ventilating cabinet main body 100, an air exhausting structure 130 is arranged on the top plate 120, side plates 140 are arranged at two sides of the air ventilating cabinet main body 100, the front ends of the side plates 140 are connected with upright columns 150, first air supplementing openings 151 are formed in the side walls of the upright columns 150 facing the chamber direction, air supplementing wings 152 are arranged at the two sides of the first air supplementing openings 151 facing the inner sides of the side walls, and the front ends of the upright columns 150 are of circular arc structures; the protection window 200 is disposed at the front end of the fume chamber body 100 and movably connected with the upright post 150, and the bottom and the top of the protection window 200 are disposed in a circular arc structure toward the chamber direction.

Compared with the traditional air supplementing type fume chamber, the first air supplementing opening 151 and the air supplementing wings 152 are added on the upright post 150, so that the air supplementing effect can be improved, meanwhile, the air supplementing wings 152 have a certain guiding effect on the entering of external air, so that moderate air is supplemented, the air flow disorder in the inner cavity is reduced, and finally the energy consumption is reduced. The bottom and the top of the protection window 200 are arranged to be of arc structures towards the chamber direction, so that the air supplementing effect can be improved, external air can smoothly enter the chamber, and meanwhile, the inside harmful gas can be prevented from overflowing.

In order to facilitate storage, a locker 600 is installed at the lower portion of the fume hood main body 100.

An air inlet box 160 is arranged below the workbench 110, a fan 300 is arranged at the rear part of the air inlet box 160, the front part of the air inlet box 160 is provided with an arc inclined plate 161, a first air outlet hole 1611 for discharging air is formed in the arc inclined plate 161, and the first air outlet hole 1611 faces the inside of the chamber.

A second air supply port 170 is arranged between the bottom of the protective window 200 and the arc inclined panel 161. After the fan 300 works, wind is blown into the cavity along the first wind outlet 1611 of the wind inlet box 160, and the second wind supplementing port 170 and the first wind supplementing port 151 work in a combined mode, so that the wind supplementing effect is further improved, external wind can smoothly enter the cavity, and meanwhile, harmful gas inside can be prevented from overflowing.

Further, the air inlet box 160 further includes a damper 162 disposed between the fan 300 and the circular arc inclined plate 161, and the damper 162 is provided with a second air outlet hole 1621, so that the air blown into the chamber is uniformly dispersed, which is beneficial to the circulation of the air in the chamber, and is more convenient for exhausting the harmful gas.

As shown in fig. 3 to 4, in this embodiment, for easy installation, the upright column 150 is made of an aluminum alloy material integrally and includes a vertical upright column body, the upright column body includes an arc wall provided with a front end, a wind supplementing side wall integrally connected with the arc wall, the wind supplementing side wall is a side facing the chamber, a first wind supplementing opening 151 is provided on the wind supplementing side wall, and a wind supplementing wing 152 is provided on the inner side of the wind supplementing side wall.

The arc wall adopts an arc structure, and the radius of the arc is larger than the left and right width of the upright post 150, so that the arc wall at the front end of the upright post 150 is streamline, and the air supplementing is facilitated.

The air supplementing wall is provided with a plurality of longitudinally distributed vertical columns of first air supplementing openings 151, the first air supplementing openings 151 can be in a long strip hole structure, and the size and the distribution interval of the long strip holes can be selected according to the size of the fume hood.

The wind entering the upright 150 is guided and relaxed to a certain degree by the wind compensating wings 152. The extending direction of the air compensating wing 152 is directed to the front end of the upright 150, and the air compensating wing 152 forms an acute angle with the air compensating side wall, preferably an angle of 45 °.

In order to better enhance the air supplementing effect of the upright 150 of the fume hood, in this embodiment, the number of air supplementing wings 152 is two and arranged in parallel, and the air supplementing wings 152 are arranged between the first air supplementing openings 151.

The post 150 body rear end is provided with curb plate mounting groove 153, has seted up the mounting hole that is used for fixed curb plate 140 on the lateral wall of curb plate mounting groove 153. Wherein the side plate 140 is a side plate 140 of the fume chamber, and the mounting holes can be formed at the upper and lower ends of the side wall of the side plate mounting groove 153. In the mounting process, the side plate 140 can be inserted into the side plate mounting groove 153 of the upright post 150, the mounting is convenient, and in order to further increase the mounting strength between the side plate 140 and the upright post 150, the upright post 150 and the side plate 140 are firmly fixed through the screw insertion mounting holes.

For convenient sliding of the protection window 200, a chute 154 is formed on the side wall of the column 150 facing the cavity, and the chute 154 is arc-shaped, so that the protection window 200 can slide up and down on the column 150.

According to the different leakage-proof grades of the fume hood, a chute 154 is reserved on the upright post 150, so that the double-layer protection window 200 is convenient to install.

As shown in fig. 2 and 6, in order to facilitate an experimenter to observe the experimental condition of the workbench 110 in time, the protection window 200 is generally set to be a glass window, the protection window 200 includes an upper frame 210, a lower frame 220, a side frame 230, and a handle assembly 240 disposed at the lower portion of the lower frame 220, the handle assembly 240 is connected with the lower frame 220 and the side frame 230 through a connecting piece 246, the handle assembly 240 includes a first handle 241, a limit post 242 disposed inside the first handle 241, and a handle control button 243 for controlling the limit post 242 to stretch and retract, and the handle control button 243 is disposed at the middle of the first handle 241. The sides of the upper frame 210 and the lower frame 220 facing the chamber direction are provided with arc structures, so that air supplement is facilitated. The handle assembly 240 has a cross section with a half crescent cambered surface structure with a large upper surface and a small lower surface, and a third air supplementing port 250 is arranged between the handle assembly 240 and the lower frame 220, and can enable external wind to smoothly enter the cavity and prevent harmful gas inside from overflowing.

Because the experimenter uses the fume chamber to carry out the experiment, need lift the protection window 200 of fume chamber to certain height after, then stretch into the cavity with the hand from the downside of cabinet door, carry out experimental operation in the cavity. In the actual experimental process, since the opening height of the protection window 200 has a certain influence on the internal air intake of the fume hood, an experimenter generally lifts the protection window 200 to the marked position during experiments, so that a good air intake effect is ensured in the fume hood chamber, and harmful gas in the fume hood is not easy to leak from the protection window 200.

Therefore, in order to facilitate the experimenter to control the push-pull position of the protection window 200, the front end face of the upright post 150 is provided with a limiting structure 180 for limiting the up-and-down push-pull position of the protection window 200, specifically, the limiting structure 180 may be a semicircular arc structure with a small upper part and a large bottom, and the limiting structure 180 is matched with the handle assembly 240.

In order to facilitate various use situations of the protection window 200, an experimenter can take and put articles without pushing and pulling the protection window 200 up and down and only pushing and pulling the protection window 200 left and right, the operation selectivity is more diversified and humanized, the protection window 200 comprises a first glass door 244 and a second glass door 245, the first glass door 244 and the second glass door 245 can be pushed and pulled left and right, and a second handle is respectively arranged on the first glass door 244 and the second glass door 245.

As shown in fig. 5, the fume hood further includes an air deflection assembly 400 disposed at the rear of the chamber, the air deflection assembly 400 being secured to the top plate 120 and the back plate 190 by a fixed air deflection clip 500, and a space being provided between the bottom of the air deflection assembly 400 and the table 110. There is a spacing between the air deflection assemblies 400 and the back plate 190.

The air deflection assembly 400 includes, from top to bottom, a first air deflection 410, a second air deflection 420, and a third air deflection 430 in sequence, a space exists between the second air deflection 420 and the third air deflection 430, and a space exists between the third air deflection 430 and the table 110.

The air outlet of the air exhaust structure 130 is disposed between the top plate 120 and the first air deflector 410. In this embodiment, the fixed guide clips 500 are fixed to the back plate 190 by screws, and a plurality of fixed guide clips 500 may be uniformly distributed. The exhaust structure 130 is connected with an exhaust fan 300 for exhausting air.

Through setting up air deflection assembly 400, can enough make things convenient for the harmful gas in the cavity to discharge, also can shelter from the air exit of exhaust structure 130, pleasing to the eye and practical promptly.

As shown in fig. 5, arrows in the drawing indicate the flow directions of the external air supply and the air of the internal chamber, and the external air is introduced from the first air supply port 151, the second air supply port 170, and the third air supply port 250, and is exhausted to the outside from the air outlet of the air exhaust structure 130 through the air exhaust fan 300.

As shown in fig. 6, the specific positions of the second and third air supply ports 170 and 250 are shown.

The implementation principle of the embodiment is as follows: when the experimenter carries out the experiment in the fume chamber, fan 300 starts, blow to the cavity of fume chamber in, the operation of exhaust fan 300, the air current in the cavity 9 flows to exhaust structure 130's direction, first air make-up mouth 151, second air make-up mouth 170 and third air make-up mouth 250 are to the interior air make-up of cavity for the atmospheric pressure in the cavity keeps stable, can also prevent that harmful gas that produces when the experiment from revealing from the exit of cavity, and exhaust fan 300 need not always high-speed operation, has reduced the work energy consumption, and then makes the whole energy consumption in laboratory obtain reducing.

Through the practical test of the inventor, the low-energy-consumption air supplementing type laboratory fume hood provided by the invention can keep the surface air speed of the fume hood within the range of 0.25m/s-0.3m/s on the premise of meeting the practical use performance of the laboratory fume hood, and the energy consumption of the low-energy-consumption air supplementing type laboratory fume hood is reduced by half compared with that of the conventional fume hood, so that the low-energy-consumption air supplementing type laboratory fume hood is worthy of popularization.

The embodiments of the present invention described above do not limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention as set forth in the appended claims.

Claims

1. The utility model provides a low energy consumption air supplement formula laboratory fume chamber, includes fume chamber main part (100) with guard window (200) that fume chamber main part (100) are connected, inside front side open-ended cavity that forms of fume chamber main part (100), the lower part of cavity is provided with workstation (110), fume chamber main part (100) top is provided with roof (120), be provided with exhaust structure (130) on roof (120), fume chamber main part (100) both sides are provided with curb plate (140), curb plate (140) front end is connected with stand (150), its characterized in that:

a first air supplementing opening (151) is formed in the side wall, facing the chamber direction, of the upright post (150), air supplementing wings (152) are arranged on the two sides of the first air supplementing opening (151) facing the inner side of the side wall, and the front end of the upright post (150) is of an arc structure;

The protection window (200) is arranged at the front end of the fume chamber main body (100) and is movably connected with the upright post (150), and the bottom and the top of the protection window (200) are arranged in an arc structure towards the direction of the chamber;

the number of the air supplementing wings (152) is two, the two air supplementing wings are arranged in parallel, an included angle is formed between each air supplementing wing (152) and the side wall, and the extending direction of each air supplementing wing (152) points to the front end of the upright post (150); the number of the first air supply openings (151) is a plurality of vertical columns which are longitudinally distributed.

2. A low energy consumption air make-up laboratory fume hood according to claim 1, wherein: an air inlet box (160) is arranged below the workbench (110), a fan (300) is arranged at the rear part of the air inlet box (160), an arc inclined panel (161) is arranged at the front part of the air inlet box (160), a first air outlet hole (1611) for discharging air is formed in the arc inclined panel (161), and the first air outlet hole (1611) faces the inside of the cavity;

A second air supplementing opening (170) is arranged between the bottom of the protective window (200) and the arc inclined panel (161).

3. A low energy consumption air make-up laboratory fume hood according to claim 2, wherein: the protection window (200) is set to be a glass window and can be pushed and pulled up and down along the upright post (150), the protection window (200) comprises an upper frame (210), a lower frame (220), a side frame (230) and a handle component (240) arranged at the lower part of the lower frame (220), the handle component (240) comprises a first handle (241), a limit post (242) arranged in the first handle (241) and a handle control button (243) for controlling the limit post (242) to stretch and retract, and the handle control button (243) is arranged on the first handle (241); the side surfaces of the upper frame (210) and the lower frame (220) facing the chamber direction are arranged to be arc structures; the whole cross section of the handle component (240) is in a half crescent cambered surface structure with a large upper part and a small lower part; a third air supplementing opening (250) is arranged between the handle assembly (240) and the lower frame (220).

4. A low energy consumption, air-filled laboratory fume hood according to claim 3, wherein: a limiting structure (180) for limiting the up-down push-pull position of the protection window (200) is arranged on the front end face of the upright post (150), and the limiting structure (180) is of a semicircular arc structure with a small upper part and a large bottom.

5. A low energy consumption air make-up laboratory fume hood according to claim 2, wherein: the protective window (200) further comprises a first glass door (244) and a second glass door (245), and the first glass door (244) and the second glass door (245) can be pushed and pulled left and right.

6. A low energy consumption air make-up laboratory fume hood according to claim 1, wherein: the rear end of the upright post (150) is provided with a side plate mounting groove (153), and the side plate (140) is inserted into the side plate mounting groove (153) and connected with the upright post (150) in an inserting mode;

A locker (600) is arranged at the lower part of the ventilation cabinet main body (100).

7. A low energy consumption air make-up laboratory fume hood according to claim 1, wherein: the ventilation cabinet further comprises an air deflector assembly (400) arranged at the rear part of the cavity, the air deflector assembly (400) is fixed with the top plate (120) and the back plate (190) through a fixed air deflector clip (500), and a space exists between the bottom of the air deflector assembly (400) and the workbench (110); a space exists between the air deflection assemblies (400) and the back plate (190).

8. A low energy consumption, air-filled laboratory fume hood according to claim 7, wherein: the air deflector assembly (400) sequentially comprises a first air deflector (410), a second air deflector (420) and a third air deflector (430) from top to bottom, a space exists between the second air deflector (420) and the third air deflector (430), and a space exists between the third air deflector (430) and the workbench (110).

9. A low energy consumption air make-up laboratory fume hood according to claim 2, wherein: the air inlet box (160) further comprises a slow air plate (162) arranged between the fan (300) and the arc inclined panel (161).