Laboratory exhaust hood with air curtain structure
By introducing an air curtain structure and baffle design into the laboratory exhaust hood, the problems of gas leakage and cleanliness were solved, achieving effective gas isolation and cleanliness protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING HOUSING & CONSTR CORP ENVIRONMENTAL PROTECTION ANTICORROSION VENTILATION EQUIP FACTORY
- Filing Date
- 2025-08-27
- Publication Date
- 2026-07-24
AI Technical Summary
Existing laboratory exhaust hoods cannot expel gas in a timely manner during use, which may diffuse beyond the edge of the hood and leak into the laboratory, endangering the health of operators. At the same time, when the make-up air device is not in use, it may affect the cleanliness of the laboratory.
A laboratory exhaust hood with a built-in air curtain structure was designed. The air curtain exhaust port and the arc-shaped air guide hood inside the hood guide the airflow to prevent toxic and harmful gases from spreading outward. When no air supply is needed, a motor-driven baffle blocks the air supply pipe to prevent external dust from entering.
It effectively prevents toxic and harmful gases from leaking out, improves ventilation efficiency, and prevents external dust or impurities from entering during normal use, thus maintaining the cleanliness of the laboratory.
Smart Images
Figure CN224542630U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of laboratory exhaust hood technology, specifically a laboratory exhaust hood with a built-in air curtain structure. Background Technology
[0002] Exhaust hoods are an indispensable safety device in laboratories. They consist of a hood body, exhaust pipes, exhaust fans, and other parts. Their main function is to quickly exhaust small particulate matter or gases such as dust, volatile gases, and harmful gases generated during experiments or production processes. They can effectively protect the health of operators and those around them, and prevent the air in the laboratory from being polluted. In existing technologies, when a typical exhaust hood is in use, the gas cannot be discharged in time and may diffuse out of the edge of the exhaust hood, posing a risk to the health of the operators in the laboratory. Furthermore, when the make-up air device is not in use, if its air inlet is not covered, it may affect the cleanliness of its interior. Utility Model Content
[0003] The purpose of this invention is to provide a laboratory exhaust hood with a built-in air curtain structure to solve the problems mentioned in the background art, such as the inconvenience of timely exhaust of toxic and harmful gases and the inability to affect the internal cleanliness during normal use.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a laboratory exhaust hood with a built-in air curtain structure, comprising an exhaust hood and an air curtain. An air curtain is provided inside the exhaust hood, and an exhaust pipe is located at the center of the top of the exhaust hood. Make-up air pipes are provided at the top of all four sides between the air curtain and the exhaust hood. Air curtain outlets are evenly distributed at the bottom of the exhaust hood corresponding to the make-up air pipes. An inward-facing arc-shaped air guide is provided at the bottom of the exhaust hood corresponding to each air curtain outlet. A support plate is provided at the top of the exhaust hood inside the air curtain, and ventilation slots are provided on the support plate corresponding to the exhaust pipes. Movable slots are provided at the bottom of both sides of the support plate, and screw grooves are provided within the support plate corresponding to each movable slot. Each screw groove is equipped with a bidirectional screw, and both ends of the bidirectional screw are connected to threaded blocks via threads. The bottom of each threaded block has a reverse L-shaped connecting block via a moving groove, and the other end of each L-shaped connecting block has a baffle plate. The air curtain hood corresponding to the baffle plate has a slot, which allows the air supply pipe to replenish air into the air curtain hood and discharge it through the air curtain exhaust port for guidance. This allows the air to re-enter the exhaust hood, preventing the leakage of toxic and harmful gases from the laboratory and improving the exhaust effect. In normal use, the L-shaped connecting block can move the baffle plate to block the air supply pipe, preventing external dust or impurities from entering the laboratory through the air supply pipe when the filter material is saturated, thus affecting the cleanliness of the laboratory.
[0005] As a further technical solution of this utility model, filter covers are provided around the top of the exhaust hood at the positions corresponding to the air supply pipes, and air inlet pipes are provided in the middle of the top of each filter cover. Sliding grooves are provided on the inner walls of both sides of the filter cover, so that the filter cover can centrally filter the incoming gas and prevent external gas from directly entering the exhaust hood.
[0006] As a further technical solution of this utility model, filter cotton is slidably connected between the slid grooves, and activated carbon is slidably connected between the slid grooves at the bottom of the filter cotton, so that the filter cotton and activated carbon perform double filtration on the incoming gas, which can improve its filtration effect, and can be slid out through the slid grooves for easy replacement.
[0007] As a further technical solution of this utility model, retractable shielding plates are provided between and on the inner side of the L-shaped connecting blocks, and the other end of the shielding plate on the inner side of the L-shaped connecting block is connected to both ends of the moving groove, so that when the L-shaped connecting block moves, the shielding plates can be extended and retracted to shield the moving groove and prevent gas from entering and remaining.
[0008] As a further technical solution of this utility model, the middle section of the bidirectional lead screw is set as an optical axis section, and a gear is provided at the middle position of the optical axis section of the bidirectional lead screw, so that the gear rotates in the optical axis section of the bidirectional lead screw, which can reduce wear.
[0009] As a further technical solution of this utility model, the top of the exhaust hood on one side of the gear is provided with a motor cover, and a motor is provided inside the motor cover, so that the motor cover protects the motor and allows the motor to be used normally.
[0010] As a further technical solution of this utility model, the output end of the motor extends through the bearing to the lead screw groove and is provided with a second gear. The second gear meshes with the corresponding first gear, so that the motor drives the second gear on its shaft to rotate, and the second gear drives the first gear meshing with it to rotate.
[0011] Compared with the prior art, the beneficial effects of this utility model are: by isolating and collecting the gas generated in the experiment through the air curtain, the exhaust efficiency can be improved, and during normal use, the air supply pipe can be shielded to prevent it from affecting the cleanliness of the laboratory.
[0012] By supplying air into the air curtain through the make-up air duct, an air curtain is formed inside the air curtain, which can prevent toxic and harmful gases in the laboratory from spreading outward. At the same time, the air inside the air curtain can be discharged through the air curtain exhaust port and guided by the arc-shaped air guide hood, so that it can be re-entered into the exhaust hood, which can prevent toxic and harmful gases in the laboratory from leaking outward and also improve the exhaust effect. The motor drives the second gear on its shaft to rotate, which in turn drives the first gear meshing with it to rotate. The first gear then drives the threaded blocks at both ends of the double-acting screw to move in the opposite direction. The threaded blocks move the baffle plate through the L-shaped connecting block, which can block the air supply pipe and prevent external dust or impurities from entering the laboratory through the air supply pipe when the filter material is saturated, thus affecting the cleanliness of the laboratory. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the front sectional view of the present invention; Figure 2 This is a schematic diagram of the bottom cross-sectional structure of this utility model; Figure 3 This is a bottom sectional view of the exhaust hood, support plate, and lead screw groove of this utility model; Figure 4 This is a side sectional view of the exhaust hood, support plate, and lead screw groove of this utility model.
[0014] In the diagram: 1. Exhaust hood; 2. Air curtain hood; 3. Make-up air duct; 4. Exhaust air duct; 5. Support plate; 6. Arc-shaped air guide hood; 7. Air curtain outlet; 8. Baffle plate; 9. L-shaped connecting block; 10. Filter cover; 11. Slide groove; 12. Filter cotton; 13. Activated carbon; 14. Moving groove; 15. Baffle plate; 16. Screw groove; 17. Gear one; 18. Threaded block; 19. Bidirectional screw; 20. Motor cover; 21. Motor; 22. Gear two. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0016] Please see Figure 1 - / 4, An embodiment of this utility model: A laboratory exhaust hood with a built-in air curtain structure, including an exhaust hood 1 and an air curtain hood 2. The air curtain hood 2 is provided inside the exhaust hood 1, and an exhaust pipe 4 is provided at the middle position of the top of the exhaust hood 1. Make-up air pipes 3 are provided on the top of the four sides between the air curtain hood 2 and the exhaust hood 1. The bottom of the exhaust hood 1 corresponding to the make-up air pipes 3 is evenly provided with air curtain outlets 7. The bottom of the exhaust hood 1 corresponding to the air curtain outlets 7 is provided with an arc-shaped air guide hood 6 facing inward. The top of the exhaust hood 1 inside the air curtain hood 2 is provided with a support plate 5, and a ventilation groove is provided on the support plate 5 at the position corresponding to the exhaust pipe 4. Specifically, such as Figure 1 and Figure 2As shown, toxic and harmful gases in the laboratory are introduced into the exhaust hood 1. When the gas smoke is large, the air supply pipe 3 can supplement air into the air curtain hood 2. The air supplied through the air supply pipe 3 forms an air curtain inside the air curtain hood 2. This air curtain can prevent the toxic and harmful gases in the laboratory from spreading outward. At the same time, the air inside the air curtain hood 2 can be discharged through the air curtain exhaust port 7. When being discharged, the air is guided by the arc-shaped air guide hood 6, which can allow the discharged gas to re-enter the exhaust hood 1 and be discharged to the external treatment box through the exhaust pipe 4. This can prevent the toxic and harmful gases in the laboratory from leaking outward and also improve the exhaust effect. Furthermore, both sides of the support plate 5 are provided with a moving groove 14 at the bottom. The support plate 5 corresponding to the moving groove 14 is provided with a screw groove 16. The screw groove 16 is provided with a bidirectional screw 19. The middle section of the bidirectional screw 19 is set as an optical axis section. The middle position of the optical axis section of the bidirectional screw 19 is provided with a gear 17. The top of the exhaust hood 1 on one side of the gear 17 is provided with a motor cover 20. The motor cover 20 is provided with a motor 21. The output end of the motor 21 extends through a bearing to the screw groove 16 where a gear 22 is provided. The gear 22 meshes with the corresponding gear 17. Both ends of the bidirectional screw 19 are connected to a threaded block 18 through a thread. The bottom of the threaded block 18 is provided with a reverse L-shaped connecting block 9 through the moving groove 14. The other end of the L-shaped connecting block 9 is provided with a baffle plate 8. The baffle plate 8 is provided with a slot on the air curtain hood 2. Specifically, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, when the exhaust hood 1 in the laboratory is in normal use and no air supply is needed, the motor 21 can be started to drive the gear 22 on its shaft to rotate. The gear 22 drives the gear 17 meshing with it to rotate. The gear 17 drives the double-acting screw 19 to move. The double-acting screw 19 drives the threaded blocks 18 at both ends to move in the opposite direction. The threaded blocks 18 drive the baffle 8 to move through the L-shaped connecting block 9. The baffle 8 moves into the air curtain hood 2 through the slot, which can block the air supply pipe 3. This can prevent external dust or impurities from entering the laboratory through the air supply pipe 3 when the filter material is saturated, thus affecting the cleanliness of the laboratory. The top of the exhaust hood 1 is equipped with filter covers 10 around the corresponding positions of the air supply pipe 3, and the top of the filter cover 10 is equipped with an air inlet pipe in the middle. The inner walls on both sides of the filter cover 10 are equipped with sliding grooves 11, and filter cotton 12 is slidably connected between the sliding grooves 11. Activated carbon 13 is slidably connected between the sliding grooves 11 at the bottom of the filter cotton 12. Specifically, such as Figure 1As shown, the air in the inlet duct enters the filter cover 10, where the filter cotton 12 and activated carbon 13 inside the filter cover 10 perform dual filtration. The filter cotton 12 can initially intercept large particulate impurities in the air, while the activated carbon 13 can further adsorb harmful gases or odors in the air, thereby effectively purifying the air entering the laboratory. When it is necessary to replace or clean the filter cotton 12 and activated carbon 13, simply pull them out from the slide 11. The operation is simple and convenient, improving work efficiency. Retractable baffles 15 are provided between and on the inner side of the L-shaped connecting blocks 9, and the other end of the baffles 15 on the inner side of the L-shaped connecting blocks 9 is connected to both ends of the moving groove 14. Specifically, such as Figure 2 As shown, when the L-shaped connecting block 9 moves, it can drive the shielding plate 15 to extend and retract, which can shield the moving groove 14 and prevent gas from entering the screw groove 16 through the moving groove 14 and causing pollution.
[0017] Working Principle: During operation, gas from the inlet duct enters the filter hood 10, where the filter cotton 12 and activated carbon 13 perform dual filtration. The filter cotton 12 initially intercepts large particulate impurities in the gas, while the activated carbon 13 further adsorbs harmful gases or odors, effectively purifying the air entering the laboratory. When the filter cotton 12 and activated carbon 13 need to be replaced or cleaned, they can simply be pulled out of the slide 11. The operation is simple and convenient, improving work efficiency. After gas filtration, air can be supplied to the air curtain hood 2 through the make-up air duct 3, forming an air curtain within the hood 2. This air curtain prevents toxic and harmful gases from diffusing outwards. Simultaneously, the air inside the air curtain hood 2 is discharged through the air curtain exhaust port 7. During discharge, the air is guided by the arc-shaped air guide hood 6, allowing the discharged gas to re-enter the exhaust hood 1 and pass through the exhaust duct 4. The exhaust box, which discharges to the outside, prevents toxic and harmful gases from leaking out of the laboratory and improves the exhaust efficiency. When the exhaust hood 1 in the laboratory is in normal use and no make-up air is needed, the motor 21 can be started to drive the gear 22 on its shaft to rotate. The gear 22 drives the gear 17 that meshes with it to rotate. The gear 17 drives the bidirectional lead screw 19 to move. The bidirectional lead screw 19 drives the threaded blocks 18 at both ends to move in the opposite direction. The threaded blocks 18 drive the baffle 8 to move through the L-shaped connecting block 9. The baffle 8 moves into the air curtain hood 2 through the slot, which can block the make-up air pipe 3. This can prevent external dust or impurities from entering the laboratory through the make-up air pipe 3 when the filter material is saturated, thus affecting the cleanliness of the laboratory. When the L-shaped connecting block 9 moves, it can drive the baffle 15 to extend and retract. The baffle 15 can extend and retract to block the moving groove 14, which can prevent gas from entering the lead screw groove 16 through the moving groove 14 and failing to be discharged in time, thus causing pollution.
[0018] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A laboratory exhaust hood with a built-in air curtain structure, comprising an exhaust hood (1) and an air curtain hood (2), characterized in that: The exhaust hood (1) is provided with an air curtain (2) on its inner side, and an exhaust pipe (4) is provided at the middle position of the top of the exhaust hood (1). The top of the air curtain (2) and the exhaust hood (1) are provided with make-up air pipes (3) on all four sides. The bottom of the exhaust hood (1) corresponding to the make-up air pipes (3) is provided with air curtain outlets (7) evenly. The bottom of the exhaust hood (1) corresponding to the air curtain outlets (7) is provided with an inward-facing arc-shaped air guide hood (6). The top of the exhaust hood (1) inside the air curtain (2) is provided with a support plate (5), and the support plate (5) is provided with a position corresponding to the exhaust pipe (4). Ventilation slots are provided, and the bottom of both sides of the support plate (5) is provided with moving slots (14). The support plate (5) corresponding to the moving slots (14) is provided with screw grooves (16), and the screw grooves (16) are provided with bidirectional screws (19). Both ends of the bidirectional screws (19) are connected to threaded blocks (18) by threads. The bottom of the threaded blocks (18) is provided with reverse L-shaped connecting blocks (9) through the moving slots (14). The other end of the L-shaped connecting blocks (9) is provided with a baffle plate (8), and the air curtain (2) corresponding to the baffle plate (8) is provided with slots.
2. The laboratory exhaust hood with a built-in air curtain structure according to claim 1, characterized in that: The exhaust hood (1) is equipped with filter covers (10) at the positions corresponding to the air supply pipe (3) around the top. The filter covers (10) are equipped with air inlet pipes in the middle of the top. The filter covers (10) are equipped with sliding grooves (11) on both sides of the inner wall.
3. A laboratory exhaust hood with a built-in air curtain structure according to claim 2, characterized in that: Filter cotton (12) is slidably connected between the grooves (11), and activated carbon (13) is slidably connected between the grooves (11) at the bottom of the filter cotton (12).
4. A laboratory exhaust hood with a built-in air curtain structure according to claim 1, characterized in that: The L-shaped connecting blocks (9) are provided with retractable shielding plates (15) between and on the inner side, and the other end of the shielding plates (15) on the inner side of the L-shaped connecting blocks (9) is connected to both ends of the moving groove (14).
5. A laboratory exhaust hood with a built-in air curtain structure according to claim 1, characterized in that: The middle section of the bidirectional lead screw (19) is set as the optical axis section, and a gear (17) is provided at the middle position of the optical axis section of the bidirectional lead screw (19).
6. A laboratory exhaust hood with a built-in air curtain structure according to claim 5, characterized in that: The exhaust hood (1) on one side of the gear (17) is provided with a motor cover (20) on top, and a motor (21) is provided inside the motor cover (20).
7. A laboratory exhaust hood with a built-in air curtain structure according to claim 6, characterized in that: The output end of each motor (21) extends through a bearing to a lead screw groove (16) where a second gear (22) is provided, and each second gear (22) meshes with a corresponding first gear (17).