A type of downdraft fume hood

Abstract

This utility model relates to the technical field of fume hoods, and in particular to a down-exhaust fume hood, which discharges waste gas and harmful gases from the bottom during operation through a down-exhaust device, and adjusts the height of the upper exhaust device through a lifting device, thereby improving the adaptability of the device according to actual operational needs. An auxiliary device enables the air duct to adapt to the height adjustment process of the lifting device, thereby improving the practicality of the device. It includes a down-exhaust device, a lifting device, and an auxiliary device, with the lifting device installed on the down-exhaust device and the auxiliary device installed on the down-exhaust device.

Description

Technical Field

[0001] This utility model relates to the technical field of fume hoods, and in particular to a downdraft fume hood. Background Technology

[0002] Fume hoods are an indispensable part of laboratory ventilation systems. To prevent laboratory staff from inhaling or ingesting toxic, pathogenic, or unidentified toxic chemicals and organisms, good ventilation is essential in laboratories. To prevent the absorption of gases, particles, fumes, dust, and aerosols, pollutants must be removed using fume hoods, ventilation covers, or localized ventilation. The primary function of a fume hood is exhaust. In chemical laboratories, various harmful gases, odors, moisture, and flammable or corrosive substances are generated during experiments. To protect user safety and prevent the spread of pollutants from the laboratory, fume hoods are used near the source of pollution. However, to avoid interfering with experiments, fume hoods are generally placed on the periphery of the laboratory, at a certain distance from experimental equipment. Harmful substances generated during experiments first diffuse into the air and are only exhausted by the fume hood when they reach its vicinity. Therefore, such fume hoods often cannot effectively remove harmful substances generated during laboratory experiments in a timely manner.

[0003] The existing Chinese utility model patent with application number CN201720013319.7 relates to a down-exhaust fume hood, which includes a support platform, connecting holes, inspection ports, double doors, handles, protruding edges, experimental tables, filter devices, and replacement holes. It solves the problem that the air suction effect of the fume hood with the top exhaust is not good. During the experimental operation, the experiment is usually carried out at the bottom of the fume hood, and the top exhaust cannot completely remove harmful substances.

[0004] However, in actual use, the exhaust position of the above device is fixed and cannot be adjusted. Some harmful gases overflow from the middle. In addition, the above device has a single fan corresponding to multiple sets of air inlets. The different exhaust rates between the multiple sets of air inlets can easily lead to insufficient exhaust efficiency on one side, affecting the overall exhaust effect. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a down-exhaust fume hood that discharges waste gas and harmful gases at the bottom during operation through a down-exhaust device, adjusts the height of the upper exhaust equipment through a lifting device, improves the adaptability of the device according to actual operating needs, and improves the practicality of the device by using an auxiliary device to enable the air duct to adapt to the height adjustment process of the lifting device.

[0006] This utility model discloses a down-exhaust fume hood, comprising a down-exhaust device, a lifting device, and an auxiliary device. The lifting device is installed on the down-exhaust device, and the auxiliary device is installed on the down-exhaust device. The down-exhaust device discharges waste gas and harmful gases from the bottom during operation. The lifting device adjusts the height of the upper exhaust equipment, improving the adaptability of the device according to actual operational needs. The auxiliary device enables the ductwork to adapt to the height adjustment process of the lifting device, thus improving the practicality of the device.

[0007] Preferably, the lower exhaust device includes a frame, an operating platform, exhaust ports, bottom fans, and a waste gas chamber. The operating platform is mounted on the lower end face of the frame via a bracket. Multiple sets of exhaust ports are evenly arranged on the sides of the operating platform. Multiple sets of bottom fans are installed on the lower end face of the operating platform corresponding to the multiple exhaust ports. The input ends of the bottom fans are connected to their respective exhaust ports. A waste gas chamber is located at the bottom of the frame, and the output ends of the multiple sets of bottom fans are connected to the interior of the waste gas chamber. The operating platform supports the operator's operation and materials. By turning on the multiple sets of bottom fans in conjunction with the multiple sets of exhaust ports, the air on the sides of the operating platform is exhausted into the waste gas chamber and then discharged. The coordination of multiple sets of bottom fans ensures that the exhaust efficiency is the same around the operating platform, thereby reducing the problem of insufficient exhaust efficiency in some areas on the sides of the operating platform by a single fan and improving the practicality of the device.

[0008] Preferably, the lifting device includes a lead screw, a dual-output reducer, a motor, a lifting frame, and a nut. A set of grooves is provided on the upper left and right sides of the frame, with a lead screw vertically installed in each groove. A dual-output reducer is installed on the top surface of the frame, with its two output ends connected to the two sets of lead screws respectively. A motor is installed on the dual-output reducer. A set of connecting frames is provided on the rear left and right sides of the lifting frame, and each set of connecting frames is connected to its corresponding lead screw via a set of nuts. Turning on the motor transmits power to the lead screws through the dual-output reducer, causing the two sets of lead screws to rotate. The two sets of lead screws, in conjunction with the nuts, move the lifting frame up and down to adjust its height, thus adapting to different experimental operations and improving the practicality of the device.

[0009] Preferably, the auxiliary device includes a mobile fan, a duct, and a serpentine elastic plate. A set of mobile fans is installed on the left and right sides of the lower end face of the lifting frame, and a set of exhaust ports is provided on the left and right sides of the inner side of the lifting frame. The input ends of the two sets of mobile fans are connected to the two sets of exhaust ports respectively. A set of rectangular slots is provided on the left and right sides of the lower end face of the frame. A duct is connected to the output end of the lifting frame. The duct extends from the rectangular slots into the exhaust gas chamber. A serpentine elastic plate is connected to the side of the duct. The serpentine elastic plate limits the duct. When the lifting frame falls to the bottom, the duct is arranged in a serpentine pattern and enters the rectangular slots on the frame. By turning on the mobile fans, the exhaust gas is discharged into the exhaust gas chamber through the duct, which improves the practicality of the device.

[0010] Preferably, the device also includes a drainage trough, a water collection tank, and a solenoid valve. A drainage trough is provided on the upper side of the operating platform, and a water collection tank is provided in the lower part of the frame. A drain outlet is provided at the bottom of the water collection tank, and a solenoid valve is installed on the drain outlet. A drain pipe is installed in the drainage trough and communicates with the inside of the water collection tank. The drainage trough collects the liquid on the operating platform and transports it to the water collection tank for storage. Opening the solenoid valve facilitates the discharge of waste liquid from the water collection tank. The drainage trough reduces the possibility of waste liquid flowing from the operating platform to other areas of the equipment and causing pollution, thus improving the practicality of the device.

[0011] Preferably, it also includes a glass observation window, which is provided on the front surface of the water collection tank; the glass observation window makes it easy to observe the height of the waste liquid level in the water collection tank, thus improving the practicality of the device.

[0012] Preferably, the device also includes a filter screen and a main fan. The filter screen is installed at an angle inside the motor, and the main fan is installed at the lower rear end of the exhaust gas chamber. The main fan assists in the discharge of exhaust gas from the exhaust gas chamber, and the filter screen filters out debris and impurities in the exhaust gas, thereby improving the practicality of the device.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: the exhaust device discharges the waste gas and harmful gases at the bottom during the operation, the lifting device adjusts the height of the upper exhaust equipment, and the device adapts to actual operation needs, thereby improving the device's adaptability. The auxiliary device enables the duct to adapt to the height adjustment process of the lifting device, thereby improving the device's practicality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the isometric structure of this utility model;

[0015] Figure 2 This is a first cross-sectional structural diagram of the present invention;

[0016] Figure 3 This is a schematic diagram of the second cross-sectional structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the third cross-sectional structure of this utility model;

[0018] The following components are labeled in the attached diagram: 1. Frame; 2. Control panel; 3. Exhaust port; 4. Bottom fan; 5. Waste gas chamber; 6. Lead screw; 7. Dual-output reducer; 8. Motor; 9. Lifting frame; 10. Nut; 11. Mobile fan; 12. Air duct; 13. Snake-shaped elastic sheet; 14. Drainage trough; 15. Water collection tank; 16. Solenoid valve; 17. Glass observation window; 18. Filter screen; 19. Main fan. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. Example 1

[0020] Figure 1 , Figure 2 , Figure 3 As shown in the figure, the lifting device is installed on the lower device, and the auxiliary device is installed on the lower device.

[0021] First, turn on multiple sets of bottom fans 4 and multiple sets of exhaust ports 3 to discharge the air from the side of the operating platform 2 into the exhaust gas chamber 5 and then discharge it. Then, turn on the motor 8 to transmit power to the lead screw 6 through the dual output reducer 7 to drive the two sets of lead screws 6 to rotate. The two sets of lead screws 6, together with the nut 10, drive the lifting frame 9 to move up and down to adjust the height. After that, turn on the mobile fan 11 to discharge the exhaust gas into the exhaust gas chamber 5 through the air duct 12.

[0022] The lower exhaust device includes a frame 1, an operating platform 2, an exhaust port 3, a bottom fan 4, and a waste gas chamber 5. The operating platform 2 is mounted on the lower end surface of the frame 1 via a bracket. Multiple sets of exhaust ports 3 are evenly arranged on the side of the operating platform 2. Multiple sets of bottom fans 4 are installed on the lower end surface of the operating platform 2 at the positions corresponding to the multiple exhaust ports 3. The input end of the bottom fan 4 is connected to its corresponding exhaust port 3. The lower part of the frame 1 is provided with a waste gas chamber 5, and the output ends of the multiple sets of bottom fans 4 are connected to the interior of the waste gas chamber 5.

[0023] The lifting device includes a lead screw 6, a dual-output reducer 7, a motor 8, a lifting frame 9, and a nut 10. The upper left and right sides of the frame 1 are respectively provided with a set of grooves, and the lead screw 6 is vertically installed in the grooves. The dual-output reducer 7 is installed on the top surface of the frame 1. The two output ends of the dual-output reducer 7 are respectively connected to the two sets of lead screws 6. The motor 8 is installed on the dual-output reducer 7. The left and right sides of the rear of the lifting frame 9 are respectively provided with a set of connecting frames. The two sets of connecting frames are respectively connected to their corresponding lead screws 6 through a set of nuts 10.

[0024] The auxiliary device includes a mobile fan 11, a duct 12, and a serpentine elastic sheet 13. A set of mobile fans 11 is installed on the left and right sides of the lower end face of the lifting frame 9. A set of exhaust ports 3 are provided on the left and right sides of the inner side of the lifting frame 9. The input ends of the two sets of mobile fans 11 are connected to the two sets of exhaust ports 3 respectively. A set of rectangular grooves are provided on the left and right sides of the lower end face of the frame 1. A duct 12 is connected to the output end of the lifting frame 9. The duct 12 extends from the rectangular groove to the interior of the exhaust gas chamber 5. A serpentine elastic sheet 13 is connected to the side of the duct 12.

[0025] It also includes a drainage trough 14, a water collection tank 15 and a solenoid valve 16. A drainage trough 14 is provided on the upper side of the operating table 2. A water collection tank 15 is provided in the lower part of the frame 1. A drain outlet is provided in the lower part of the water collection tank 15. A solenoid valve 16 is installed on the drain outlet. A drain pipe is installed in the drainage trough 14 and communicates with the inside of the water collection tank 15.

[0026] It also includes a glass observation window 17, which is provided on the front end face of the water collection tank 15;

[0027] It also includes a filter screen 18 and a main fan 19. The filter screen 18 is installed at an angle inside the motor 8. The main fan 19 is installed at the lower rear end of the exhaust gas chamber 5. The exhaust gas and harmful gases at the bottom during operation are discharged through the lower exhaust device. The height of the upper exhaust equipment is adjusted by the lifting device. The adaptability of the device is improved according to the actual operation requirements. The auxiliary device enables the air duct to adapt to the height adjustment process of the lifting device, which improves the practicality of the device.

[0028] like Figures 1 to 4 As shown, this utility model discloses a bottom exhaust ventilation hood. When in operation, multiple sets of bottom fans 4 are turned on in conjunction with multiple sets of exhaust ports 3 to exhaust the air from the side of the operating table 2 into the exhaust gas chamber 5 and then discharge it. Then, the motor 8 is turned on to transmit power to the lead screw 6 through the dual output reducer 7, which drives the two sets of lead screws 6 to rotate. The two sets of lead screws 6, together with the nuts 10, drive the lifting frame 9 to move up and down to adjust the height. After that, the mobile fan 11 is turned on to discharge the exhaust gas into the exhaust gas chamber 5 through the air duct 12.

[0029] The dual-output reducer 7, mobile fan 11, bottom fan 4, and solenoid valve 16 of this utility model for a downdraft ventilation hood are commercially available. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A fume hood with under exhaust; characterized in that, It includes a lower discharge device, a lifting device, and an auxiliary device. The lifting device is installed on the lower discharge device, and the auxiliary device is installed on the lower discharge device.

2. A fume hood of claim 1, wherein, The lower exhaust device includes a frame (1), an operating table (2), an exhaust port (3), a bottom fan (4), and a waste gas chamber (5). The operating table (2) is mounted on the lower end of the frame (1) via a bracket. Multiple sets of exhaust ports (3) are evenly arranged on the side of the operating table (2). Multiple sets of bottom fans (4) are installed on the lower end of the operating table (2) at the positions corresponding to the multiple exhaust ports (3). The input end of the bottom fan (4) is connected to its corresponding exhaust port (3). A waste gas chamber (5) is provided at the lower part of the frame (1). The output end of the multiple sets of bottom fans (4) is connected to the inside of the waste gas chamber (5).

3. A fume hood of claim 2, wherein, The lifting device includes a lead screw (6), a dual-output reducer (7), a motor (8), a lifting frame (9), and a nut (10). A set of grooves is provided on the upper left and right sides of the frame (1), and a lead screw (6) is vertically installed in the grooves. A dual-output reducer (7) is installed on the top surface of the frame (1). The two output ends of the dual-output reducer (7) are connected to the two sets of lead screws (6) respectively. A motor (8) is installed on the dual-output reducer (7). A set of connecting frames is provided on the left and right sides of the rear of the lifting frame (9). The two sets of connecting frames are connected to their corresponding lead screws (6) through a set of nuts (10).

4. A fume hood of claim 3, wherein The auxiliary device includes a mobile fan (11), a duct (12) and a serpentine elastic sheet (13). A set of mobile fans (11) is installed on the left and right sides of the lower end face of the lifting frame (9). A set of exhaust ports (3) is provided on the left and right sides of the inner side of the lifting frame (9). The input ends of the two sets of mobile fans (11) are connected to the two sets of exhaust ports (3) respectively. A set of rectangular grooves is provided on the left and right sides of the lower end face of the frame (1). A duct (12) is connected to the output end of the lifting frame (9). The duct (12) extends from the rectangular groove to the interior of the exhaust gas chamber (5). A serpentine elastic sheet (13) is connected to the side of the duct (12).

5. A fume hood of claim 4, wherein, It also includes a drainage trough (14), a water collection tank (15) and a solenoid valve (16). A drainage trough (14) is provided on the upper side of the operating table (2). A water collection tank (15) is provided in the lower part of the frame (1). A drain outlet is provided in the lower part of the water collection tank (15). A solenoid valve (16) is installed on the drain outlet. A drain pipe is installed in the drainage trough (14) and communicates with the inside of the water collection tank (15).

6. A fume hood of the type defined in claim 5, characterized in that It also includes a glass observation window (17), which is provided on the front end face of the water collection tank (15).

7. A fume hood of the type defined in claim 6, characterized in that It also includes a filter screen (18) and a main fan (19). The filter screen (18) is installed at an angle inside the motor (8), and the main fan (19) is installed at the lower rear end of the exhaust gas chamber (5).

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