Ventilation cabinet for laboratory

Abstract

The utility model relates to the technical field of ventilation cabinets, and discloses a laboratory ventilation cabinet which comprises a cabinet body, a ventilation pipe fixedly penetrates through the top end of the cabinet body, a first fixing frame is fixedly connected to the inner wall of the ventilation pipe, and a fan is fixedly connected to the inner wall of the first fixing frame. The side, corresponding to the first fixing frame, of the inner wall of the ventilation pipe is fixedly connected with a second fixing frame, and one end of the second fixing frame communicates with a notch. Through the structures of a motor, a second rotating shaft, a first rotating shaft, a second rotating shaft, a first bevel gear, a second bevel gear and the like, a baffle can expand outwards, so that the opening degree of a ventilation opening is adjusted, the effect of influencing the ventilation quantity is achieved, and the problem that the ventilation quantity cannot be adjusted according to stored experimental articles in the using process of a traditional ventilation cabinet is solved. And in addition, external dust can enter the interior of the cabinet body in the use process, so that the internal experiment articles are influenced.

Description

Technical Field

[0001] This utility model relates to the field of fume hood technology, specifically a laboratory fume hood. Background Technology

[0002] Laboratories are high-energy-consuming environments that consume a huge amount of energy every year. As ventilation and exhaust equipment in laboratories, laboratory fume hoods play a crucial role in the laboratory's terminal control system, such as timely exhaust of harmful gases generated in the laboratory and creating negative pressure for exhaust.

[0003] Chinese patent provides a laboratory fume hood, publication number CN222112991U, which includes a first cabinet body, a second cabinet body fixedly installed on the top of the first cabinet body, an L-shaped ventilation duct connected to the top of the second cabinet body, an exhaust duct connected to the right side of the L-shaped ventilation duct, a ventilation mechanism and a filter screen provided on the L-shaped ventilation duct, and a cleaning mechanism and a shielding mechanism provided on the L-shaped ventilation duct.

[0004] The aforementioned fume hood incorporates a cleaning mechanism and a shielding mechanism. The cleaning mechanism not only removes dust from the filter screen, but the shielding mechanism also blocks the L-shaped ventilation duct, preventing dust from falling into the second cabinet. The cleaning mechanism can also collect the dust removed from the filter screen, eliminating the need for manual cleaning and improving efficiency. However, it cannot adjust the ventilation volume according to the stored experimental items, reducing its applicability. Furthermore, it allows external dust to enter the cabinet, affecting the experimental items inside. Utility Model Content

[0005] The purpose of this utility model is to provide a laboratory fume hood to solve the problems of existing fume hoods being unable to adjust the ventilation volume according to the stored experimental items during use, resulting in reduced applicability, and allowing external dust to enter the cabinet during use, thereby affecting the experimental items inside.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a laboratory fume hood, comprising a cabinet body, a ventilation pipe fixedly passing through the top of the cabinet body, a first fixed frame fixedly connected to the inner wall of the ventilation pipe, a fan fixedly connected to the inner wall of the first fixed frame, a second fixed frame fixedly connected to one side of the inner wall of the ventilation pipe corresponding to the first fixed frame, a notch connected to one end of the second fixed frame, fixed plates fixedly connected to both sides of the inner wall of the notch in the horizontal direction, a first rotating shaft rotatably connected between the two sets of fixed plates, a first bevel gear fixedly connected to both ends of the two first rotating shafts, a second bevel gear meshing with the outer diameter of the two sets of first bevel gears, a second rotating shaft fixedly connected between the two sets of second bevel gears, the two second rotating shafts rotating with the notch, and baffles fixedly connected to the outer walls of the two first rotating shafts and the two second rotating shafts.

[0007] Preferably, a motor is fixedly connected to the rear end of the ventilation duct, and the motor drive end is fixedly connected to one of the second rotating shafts.

[0008] Preferably, an exhaust plate is fixedly connected to the other end of the ventilation pipe, and a placement groove is opened at one end of the exhaust plate, with a channel connected to the other end of the placement groove.

[0009] Preferably, a fixing frame is fixedly connected to the inner wall of the placement groove, a guide post slides through the fixing frame, and a blocking block is fixedly connected to one end of the guide post.

[0010] Preferably, a spring is fixedly connected between the blocking block and the fixing frame, and a limit block is fixedly connected to the other end of the guide post.

[0011] Preferably, one end of the blocking block is tapered, and the cabinet door is rotatably connected to the open end of the cabinet.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1) The laboratory fume hood, through the cooperation of the motor, the second rotating shaft, the first rotating shaft, the second rotating shaft, the first bevel gear and the second bevel gear, can expand the baffle to the outside, thereby adjusting the opening degree of the vent and thus affecting the ventilation volume.

[0014] 2) This laboratory fume hood, through the cooperation of exhaust panels, placement slots, channels, fixing frames, guide columns, blocking blocks and springs, can be kept in a closed state without exhausting air, which can prevent external dust from entering the cabinet and improve the dustproof effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a laboratory fume hood according to the present invention;

[0016] Figure 2 This is a top-view perspective view of a laboratory fume hood according to the present invention;

[0017] Figure 3 This is a cross-sectional view of the ventilation duct of a laboratory fume hood according to the present invention;

[0018] Figure 4 This is another perspective view of the ventilation duct of a laboratory fume hood according to the present invention;

[0019] Figure 5 This is a sectional view of the second fixing frame of a laboratory fume hood according to the present invention;

[0020] Figure 6 This utility model relates to a laboratory fume hood. Figure 5 Enlarged view of point A in the middle;

[0021] Figure 7 This is a cross-sectional view of the exhaust plate of a laboratory fume hood according to the present invention.

[0022] In the diagram: 1. Cabinet; 2. Ventilation duct; 3. First fixed frame; 4. Fan; 5. Second fixed frame; 6. Notch; 7. Fixed plate; 8. First rotating shaft; 9. First bevel gear; 10. Second bevel gear; 11. Second rotating shaft; 12. Baffle; 13. Motor; 14. Exhaust plate; 15. Placement slot; 16. Channel; 17. Fixed frame; 18. Guide column; 19. Blocking block; 20. Spring; 21. Limiting block. Detailed Implementation

[0023] 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.

[0024] Example 1

[0025] Combination Figures 1-7A laboratory fume hood includes a cabinet body 1. A ventilation pipe 2 is fixedly inserted through the top of the cabinet body 1. A first fixing frame 3 is fixedly connected to the inner wall of the ventilation pipe 2. A fan 4 is fixedly connected to the inner wall of the first fixing frame 3. A second fixing frame 5 is fixedly connected to one side of the inner wall of the ventilation pipe 2 corresponding to the first fixing frame 3. One end of the second fixing frame 5 is connected to a notch 6. Fixing plates 7 are fixedly connected to both sides of the inner wall of the notch 6 in the horizontal direction. A first rotating shaft 8 is rotatably connected between the two sets of fixing plates 7. A first bevel gear 9 is fixedly connected to both ends of the two first rotating shafts 8. A second bevel gear 10 is meshed with the outer diameter of the two sets of first bevel gears 9. A second rotating shaft 11 is fixedly connected between the two sets of second bevel gears 10. The two second rotating shafts 11 rotate with the notch 6. Baffles 12 are fixedly connected to the outer walls of the two first rotating shafts 8 and the two second rotating shafts 11. A motor 13 is fixedly connected to the rear end of the ventilation pipe 2. The drive end of the motor 13 is fixedly connected to one of the second rotating shafts 11.

[0026] Specifically, when the motor 13 starts, its drive end will drive a second rotating shaft 11 fixedly connected to it to start rotating. Since two second bevel gears 10 are fixedly connected to the second rotating shaft 11, these two second bevel gears 10 will mesh with the outer diameter of two sets of first bevel gears 9 respectively. Therefore, when the second rotating shaft 11 rotates, it will drive the two first rotating shafts 8 to start rotating in the opposite direction to the second rotating shaft 11 through the meshing relationship between the second bevel gears 10 and the first bevel gears 9. Since baffles 12 are fixedly connected to the outer walls of the two first rotating shafts 8 and the two second rotating shafts 11, when these shafts rotate, they will drive the baffles 12 to move synchronously and in opposite directions within the notch 6. This movement will change the opening size of the notch 6, thereby adjusting the ventilation volume in the ventilation pipe 2.

[0027] Example 2

[0028] See Figure 7 Furthermore, based on Embodiment 1, the ventilation pipe 2 is further provided with an exhaust plate 14 fixedly connected to the other end. One end of the exhaust plate 14 is provided with a placement groove 15. One end of the placement groove 15 is connected to a channel 16. A fixing frame 17 is fixedly connected to the inner wall of the placement groove 15. A guide post 18 slides through the fixing frame 17. A blocking block 19 is fixedly connected to one end of the guide post 18. A spring 20 is fixedly connected between the blocking block 19 and the fixing frame 17. A limit block 21 is fixedly connected to the other end of the guide post 18. One end of the blocking block 19 is tapered. A cabinet door is rotatably connected to the open end of the cabinet body 1.

[0029] Specifically, when the fume hood is in operation, the blocking block 19 is held in a relatively fixed position by the action of the spring 20, allowing a certain amount of air to flow out through the channel 16, which in turn drives the guide column 18 and the blocking block 19 to move. As the blocking block 19 moves, it gradually opens the opening of the channel 16, allowing the gas inside the cabinet 1 to be discharged. When not in use, the blocking block 19 blocks the channel 16 to prevent external dust from entering and improve the sealing performance.

[0030] In actual operation, the fan 4 is first started to generate suction, which guides the air inside the cabinet 1 to be discharged through the ventilation pipe 2. At the same time, the motor 13 drives one of the second rotating shafts 11 to rotate. Then, the first bevel gears 9 and the second bevel gears 10 on the two first rotating shafts 8 and the two second rotating shafts 11 mesh with each other, so that the baffle 12 can be expanded outward, thereby adjusting the opening degree of the ventilation opening and thus affecting the ventilation volume.

[0031] The exhaust plate 14 and its placement slot 15 and channel 16 constitute the final ventilation outlet, while the mechanism consisting of the fixing bracket 17, guide column 18, blocking block 19 and spring 20 can be in a closed state when no ventilation is required, which can prevent external dust from entering the cabinet 1 and improve the dustproof effect.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A laboratory fume hood, comprising a cabinet body (1), characterized in that: A ventilation pipe (2) is fixedly connected to the top of the cabinet (1). A first fixed frame (3) is fixedly connected to the inner wall of the ventilation pipe (2). A fan (4) is fixedly connected to the inner wall of the first fixed frame (3). A second fixed frame (5) is fixedly connected to one side of the inner wall of the ventilation pipe (2) corresponding to the first fixed frame (3). A notch (6) is connected to one end of the second fixed frame (5). Fixed plates (7) are fixedly connected to both sides of the inner wall of the notch (6) in the horizontal direction. A first rotating shaft (8) is rotatably connected between the two sets of fixed plates (7). A first bevel gear (9) is fixedly connected to both ends of the two first rotating shafts (8). A second bevel gear (10) is meshed with the outer diameter of the two sets of first bevel gears (9). A second rotating shaft (11) is fixedly connected between the two sets of second bevel gears (10). The two second rotating shafts (11) rotate with the notch (6). A baffle (12) is fixedly connected to the outer wall of the two first rotating shafts (8) and the two second rotating shafts (11).

2. A laboratory fume hood according to claim 1, characterized in that: The rear end of the ventilation pipe (2) is fixedly connected to a motor (13), and the drive end of the motor (13) is fixedly connected to one of the second rotating shafts (11).

3. A laboratory fume hood according to claim 2, characterized in that: The ventilation pipe (2) is fixedly connected to an exhaust plate (14) at the other end. One end of the exhaust plate (14) is provided with a placement groove (15), and one end of the placement groove (15) is connected to a channel (16).

4. A laboratory fume hood according to claim 3, characterized in that: A fixing frame (17) is fixedly connected to the inner wall of the placement slot (15), and a guide post (18) slides through the fixing frame (17). A blocking block (19) is fixedly connected to one end of the guide post (18).

5. A laboratory fume hood according to claim 4, characterized in that: A spring (20) is fixedly connected between the blocking block (19) and the fixing frame (17), and a limit block (21) is fixedly connected to the other end of the guide post (18).

6. A laboratory fume hood according to claim 4, characterized in that: The blocking block (19) has a tapered shape at one end, and the cabinet (1) has a cabinet door rotatably connected to its open end.

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