A centralized supply and exhaust system for multiple fume hoods in a laboratory

Abstract

The application discloses a laboratory multi-ventilating cabinet centralized air supply and exhaust system, which is characterized in that the ventilating cabinet body, the air exhaust system and the air supply system are included; the air exhaust system is used for exhausting air in the ventilating cabinet body; the air supply system is used for supplying air into the ventilating cabinet body; the ventilating cabinet body includes an experimental space, one side of the experimental space is open, a lifting plate is arranged at the opening of the experimental space, the lifting plate can slide up and down at the opening of the experimental space, the experimental space is opened by sliding upward, and the experimental space is closed by moving downward; the air supply system includes an air curtain groove, the air curtain groove is arranged at the bottom of the experimental space and close to the opening and blows air upward, the length direction of the air curtain groove is arranged along the width direction of the experimental space to form an air curtain which blows air upward; the air curtain formed by the air curtain groove can not only push the air in the experimental space into the air exhaust system, but also prevent the gas in the experimental space from leaking outward through the air curtain.

Description

A centralized air supply and exhaust system for multiple fume hoods in a laboratory Technical Field

[0001] This invention relates to the technical field of laboratory ventilation, and more specifically, to a centralized air supply and exhaust system for multiple fume hoods in a laboratory. Background Technology

[0002] Fume hoods are an indispensable component of laboratory ventilation design. To prevent laboratory personnel from inhaling or ingesting toxic, pathogenic, or unidentified toxic chemicals and organisms, good ventilation is essential in laboratories. Current laboratory fume hoods typically involve lowering the glass window to a certain height before personnel can insert their hands for experiments. However, this lowering of the window inevitably leads to some gas leakage, which can potentially harm laboratory personnel. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a centralized air supply and exhaust system for multiple fume hoods in a laboratory. The system uses an air curtain formed by air curtain troughs to both drive air from the experimental space into the exhaust system and prevent gas leakage from the experimental space to the outside.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a centralized air supply and exhaust system for multiple laboratory fume hoods, comprising fume hoods, wherein multiple fume hoods are provided;

[0005] An exhaust system for discharging air from the fume hood;

[0006] And an air supply system, the air supply system being used to supply air into the fume hood;

[0007] The fume hood includes an experimental space with an opening on one side. A lifting plate is installed at the opening of the experimental space. The lifting plate can slide up and down at the opening of the experimental space. The experimental space can be opened by sliding upward and closed by moving downward.

[0008] The air supply system includes an air curtain trough. An upward-blowing air curtain trough is set at the bottom of the experimental space near the opening. The length of the air curtain trough is set along the width of the experimental space to form an upward-blowing air curtain.

[0009] The present invention is further configured such that: a storage space is provided inside the fume hood, the storage space is located below the experimental space, and the storage space is used for storing items;

[0010] The openings of the storage space and the experimental space are located on the same side of the fume hood.

[0011] The present invention is further configured such that: a shielding plate is provided at the opening of the experimental space, and the shielding plate is located at the top of the opening of the experimental space;

[0012] The shielding plate has a receiving groove that extends downward through the shielding plate on the side near the experimental space. The lifting plate can slide up and down in the receiving groove. The lifting plate can be completely retracted into the receiving groove upward or it can work with the shielding plate downward to close the opening of the experimental space.

[0013] The present invention is further configured such that: the bottom of the lifting plate is set as an inclined surface, and the inclined surface is inclined upward on the side closer to the experimental space;

[0014] A horizontal bar is provided on one side of the ventilation cabinet where the lifting plate is located. The horizontal bar is located between the storage space and the experimental space. The top of the horizontal bar is also provided with a slope, which can fit into the slope at the bottom of the baffle plate.

[0015] The present invention is further configured such that: the exhaust system includes an exhaust pipe, each exhaust pipe corresponds to a ventilation cabinet, the exhaust pipe is fixedly connected to the top of the ventilation cabinet and communicates with the experimental space;

[0016] An inclined plate is installed in the experimental space. The two sides of the inclined plate are fixedly connected to the two side walls of the experimental space. The end of the inclined plate near the baffle is inclined upward and fixedly connected to the top side wall of the experimental space. The exhaust pipe is located above the baffle.

[0017] A vertically arranged guide plate is fixedly connected to the inclined lower end of the shield away from the shield. The two sides of the guide plate are fixedly connected to the two side walls of the experimental space. An airflow channel is left between the side of the guide plate away from the shield and the side wall of the experimental space away from the shield. An airflow channel is also left between the bottom of the guide plate and the bottom side wall of the experimental space.

[0018] The present invention is further configured such that: a horizontally arranged partition is provided between the experimental space and the storage space, and the air curtain trough is fixedly connected to the top of the partition;

[0019] The air supply system also includes an air inlet channel, which is installed inside the partition plate and is connected to the air curtain trough;

[0020] An air inlet duct, which is used to introduce air into the air inlet channel;

[0021] And connecting pipes, wherein each air intake pipe is connected to each ventilation cabinet, and the connecting pipes connect the air intake pipe to the air intake channel.

[0022] The present invention is further configured such that: the two sides of the air inlet channel are respectively aligned with the two ends of the inner hole of the air curtain groove;

[0023] Several air distribution rods are fixedly connected inside the air inlet channel. There are two sets of air distribution rods, each set including multiple air distribution rods. The two sets of air distribution rods are arranged alternately along the width direction of the air inlet channel.

[0024] The invention is further configured such that: each ventilation cabinet is fixedly connected to three connecting pipes, the three connecting pipes are arranged along the width direction of the air inlet channel, and the three connecting pipes are connected to the air inlet pipe.

[0025] The present invention is further configured such that: the exhaust system also includes an exhaust fan, and each ventilation cabinet is provided with an exhaust fan connected to the exhaust duct at its top;

[0026] A central duct, which is connected to multiple exhaust ducts;

[0027] And an exhaust gas treatment unit, which is used to treat the exhaust gas fed into the central pipe and then discharge the treated clean air.

[0028] The air supply system includes an air supply box, which is connected to an air inlet pipe;

[0029] And a supply fan, which supplies air into the supply box through a pipe;

[0030] The exhaust gas treatment unit is fixedly connected to a three-way pipe at its outlet. One end of the three-way pipe is connected to the exhaust gas treatment unit, one end is connected to the air supply box, and the other end is connected to the atmosphere.

[0031] The present invention is further configured to include a wind speed sensor, wherein each experimental space is provided with a wind speed sensor located above the wind curtain trough;

[0032] Temperature sensors are installed in each experimental space;

[0033] An electric heating mesh is installed inside an air supply box;

[0034] And a main control unit, which is connected to a wind speed sensor, a temperature sensor and an electric heating grid.

[0035] In summary, the present invention has the following advantages over the prior art: the air curtain formed by the air curtain trough can both push the air in the experimental space into the exhaust system and prevent the gas in the experimental space from leaking out. Attached Figure Description

[0036] Figure 1 is a schematic diagram of the overall structure of the embodiment;

[0037] Figure 2 is an enlarged schematic diagram of part A in Figure 1;

[0038] Figure 3 is a schematic diagram of the ventilation cabinet in the embodiment;

[0039] Figure 4 is an enlarged schematic diagram of part B in Figure 3;

[0040] Figure 5 is a cross-sectional view of the ventilation cabinet in the embodiment;

[0041] Figure 6 is an enlarged schematic diagram of part C in Figure 5;

[0042] Figure 7 is an enlarged schematic diagram of part D in Figure 5;

[0043] Figure 8 is a cross-sectional view of the partition plate in the embodiment;

[0044] Figure 9 is a schematic diagram illustrating the connecting pipe in the embodiment;

[0045] Figure 10 is an enlarged schematic diagram of part E in Figure 9.

[0046] In the diagram: 1. Fume hood; 11. Experimental space; 12. Storage space; 13. Baffle; 131. Receiving slot; 14. Lifting plate; 141. Lead screw; 15. Inclined plate; 16. Guide plate; 2. Exhaust system; 21. Exhaust duct; 22. Central duct; 23. Waste gas treatment unit; 24. T-junction; 3. Air supply system; 31. Air supply box; 32. Air inlet duct; 33. Air curtain trough; 34. Air inlet channel; 341. Air distribution bar; 35. Connecting pipe; 4. Divider plate; 5. Horizontal bar. Detailed Implementation

[0047] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments in this application, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the scope of protection of this application. Furthermore, directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings; therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0048] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0049] Example: A centralized air supply system 3 for multiple fume hoods in a laboratory, as shown in Figures 1-10, includes multiple fume hoods 1 installed in a laboratory, an exhaust system for discharging air from the fume hoods 1, and an air supply system 3 for supplying air to the fume hoods 1. Each fume hood 1 includes an experimental space 11 with an opening on one side. A lifting plate 14 is installed at the opening of the experimental space 11, capable of sliding up and down at the opening. Sliding upwards opens the experimental space 11, while sliding downwards closes it. The air supply system 3 includes an air curtain trough 33. An upward-blowing air curtain trough 33 is located at the bottom of the experimental space 11 near the opening, with its length extending along the width of the experimental space 11 to form an upward-blowing air curtain.

[0050] During the experiment, the air curtain trough 33 blows air upwards, forming an upward-blowing air curtain. The presence of the air curtain prevents the air in the experimental space 11 from leaking outwards through the air curtain, and it can only be discharged outwards through the exhaust system, thus making it less likely to cause harm to the experimental personnel.

[0051] Specifically, the ventilation cabinet 1 is also equipped with a storage space 12, which is located below the experimental space 11 and is used for storing items; the opening of the storage space 12 and the opening of the experimental space 11 are located on the same side of the ventilation cabinet 1.

[0052] A baffle plate 13 is also provided at the opening of the experimental space 11. The baffle plate 13 is located at the top of the opening of the experimental space 11. A receiving groove 131 is provided on the side of the baffle plate 13 near the experimental space 11, which extends downward through the baffle plate 13. The lifting plate 14 can slide up and down in the receiving groove 131. The lifting plate 14 can be completely retracted into the receiving groove 131 upward or it can work with the baffle plate 13 downward to close the opening of the experimental space 11.

[0053] Specifically, two vertically arranged lead screws 141 are provided on both sides of the receiving groove 131. The lead screws 141 are rotatably connected to the baffle plate 13, and the lead screws 141 pass vertically through the lifting plate 14 and are threadedly connected to the lifting plate 14. By rotating the lead screws 141, the baffle plate 13 can be moved up and down, thereby opening and closing the opening of the experimental space 11. Furthermore, through the threaded engagement between the lead screws 141 and the baffle plate 13, the baffle plate 13 can be maintained at a specific height under the action of the lead screws 141 after it is raised.

[0054] Specifically, the bottom of the lifting plate 14 is set as an inclined surface, and the inclined surface is inclined upward on the side close to the experimental space 11. By setting the inclined surface at the bottom of the lifting plate 14, the air blown upward by the air curtain trough 33 can flow into the experimental space 11 along the inclined line under the action of the inclined surface when it blows to the bottom of the lifting plate 14, further preventing the air in the experimental space 11 from leaking out from the opening of the experimental space 11.

[0055] A horizontal bar 5 is provided on one side of the fume hood 1 where the lifting plate 14 is located. The horizontal bar 5 is situated between the storage space 12 and the experimental space 11. The top of the horizontal bar 5 is also provided with a slope, which can fit into the slope at the bottom of the baffle plate 13. By providing a slope on the horizontal bar 5, when the lifting plate 14 descends and contacts the horizontal bar 5, the experimental space 11 can be sealed.

[0056] Specifically, the exhaust system includes an exhaust duct 21, each exhaust duct 21 corresponding to a ventilation cabinet 1. The exhaust duct 21 is fixedly connected to the top of the ventilation cabinet 1 and communicates with the experimental space 11. An inclined plate 15 is provided in the experimental space 11. The two sides of the inclined plate 15 are fixedly connected to the two side walls of the experimental space 11, respectively. The end of the inclined plate 15 near the baffle plate 13 is inclined upward and fixedly connected to the top side wall of the experimental space 11. The exhaust duct 21 is located above the baffle plate 13. A vertically arranged guide plate 16 is fixedly connected to the inclined lower end of the baffle plate 13 away from the baffle plate 13. The two sides of the guide plate 16 are fixedly connected to the two side walls of the experimental space 11. An airflow channel is left between the side of the guide plate 16 away from the baffle plate 13 and the side wall of the experimental space 11 away from the baffle plate 13. An airflow channel is also left between the bottom of the guide plate 16 and the bottom side wall of the experimental space 11.

[0057] By using the inclined plate 15, the air blown upwards from the air curtain trough 33, when flowing to the top of the experimental space 11, is guided by the inclined plate 15 to flow diagonally downwards along its inclination direction. Then, guided by the guide plate 16, it flows downwards again, bypassing the gap between the guide plate 16 and the bottom side wall of the experimental space 11, flowing upwards through the gap between the guide plate 16 and the side wall of the experimental space 11 away from the baffle plate 13, and finally flowing into the exhaust duct 21. Guided by the inclined plate 15 and the guide plate 16, the air blown upwards from the air curtain trough 33, when reaching the top of the experimental space 11, carries the air inside the experimental space 11 downwards, allowing the air inside the experimental space 11 to enter the exhaust duct 21 more smoothly.

[0058] Specifically, a horizontally arranged partition plate 4 is provided between the experimental space 11 and the storage space 12, and the air curtain trough 33 is fixedly connected to the top of the partition plate 4.

[0059] Specifically, the air supply system 3 includes an air inlet channel 34, an air inlet duct 32, and a connecting pipe 35. The air inlet channel 34 is located within the partition plate 4 and is connected to the air curtain trough 33. The air inlet duct 32 is used to introduce air into the air inlet channel 34. A connecting pipe 35 is provided between the air inlet duct 32 and each fume hood 1, connecting the air inlet duct 32 and the air inlet channel 34.

[0060] Specifically, the two sides of the air inlet channel 34 are aligned with the two ends of the inner hole of the air curtain groove 33. Several air distribution rods 341 are fixedly connected inside the air inlet channel 34. Two sets of air distribution rods 341 are provided, each set including multiple air distribution rods 341. The two sets of air distribution rods 341 are staggered along the width direction of the air inlet channel 34. The arrangement of the air distribution rods 341 ensures that the air entering the air inlet channel 34 is evenly distributed along the width direction of the air inlet channel 34. This makes the wind speed of the air curtain blown upwards from the air curtain groove 33 more uniform along the length direction of the air curtain groove 33, thus effectively preventing air leakage from the experimental space 11 from its opening.

[0061] Specifically, each fume hood 1 is fixedly connected to three connecting pipes 35, which are arranged along the width of the air inlet channel 34 and are connected to the air inlet pipe 32. Each connecting pipe 35 is equipped with a solenoid valve, which controls whether air enters the fume hood 1.

[0062] Specifically, the exhaust system also includes an exhaust fan, a central duct 22, and an exhaust gas treatment unit 23. Each ventilation cabinet 1 is equipped with an exhaust fan connected to the exhaust duct 21 at its top. The central duct 22 is connected to multiple exhaust ducts 21, thereby collecting and transmitting the exhaust gas extracted from the multiple exhaust ducts 21 through the central duct 22. The exhaust gas treatment unit is used to treat the exhaust gas sent into the central duct 22 and then discharge the treated clean air.

[0063] Specifically, the air supply system 3 also includes an air supply box 31 and an air supply fan. The air supply box 31 is connected to the air inlet pipe 32, and the air supply fan supplies air into the air supply box 31 through the pipe. A three-way pipe 24 is fixedly connected to the outlet end of the exhaust gas treatment unit 23. One end of the three-way pipe 24 is connected to the exhaust gas treatment unit 23, one end is connected to the air supply box 31, and the other end is open to the atmosphere. A solenoid valve is installed at the end of the three-way pipe 24 connected to the air supply box 31, and a solenoid valve is also installed at the end connected to the atmosphere. The solenoid valves control whether the treated air is discharged into the atmosphere or sent into the air supply box 31.

[0064] Specifically, this embodiment also includes a wind speed sensor, a temperature sensor, an electric heating grid, and a main control unit. Each experimental space 11 is equipped with a wind speed sensor located above the air curtain trough 33, and each experimental space 11 is equipped with a temperature sensor. The electric heating grid is installed in the air supply box 31, and the main control unit is connected to the wind speed sensor, the temperature sensor, and the electric heating grid.

[0065] Specifically, the wind speed sensor detects the wind speed of the air curtain blowing upward from the air curtain trough 33. The main control unit determines whether the wind speed meets the requirements for blocking air leakage. If the requirements are not met, the main control unit controls the power of the air supply fan to increase. Furthermore, an upper limit for the wind speed is set. When the main control unit determines that the wind speed exceeds the upper limit, the main control unit controls the power of the air supply fan to decrease.

[0066] Specifically, by setting a temperature sensor in the experimental space 11, when the temperature in the experimental space 11 is lower than the required temperature in the experimental space 11, the control unit controls the temperature of the electric heating wire to rise, thereby increasing the temperature in the experimental space 11.

[0067] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A centralized air supply and exhaust system for multiple fume hoods in a laboratory, characterized in that: The system includes a ventilation cabinet (1), of which multiple ventilation cabinets (1) are provided; an exhaust system for exhausting air from the ventilation cabinets (1); and an air supply system (3) for supplying air to the ventilation cabinets (1); the ventilation cabinet (1) includes an experimental space (11) with an opening on one side, and a lifting plate (14) is provided at the opening of the experimental space (11), which can slide up and down at the opening of the experimental space (11), opening the experimental space (11) by sliding upward and closing the experimental space (11) by moving downward; the air supply system (3) includes an air curtain trough (33), which is provided at the bottom of the experimental space (11) near the opening. An air curtain trough (33) is provided, with its length direction along the width direction of the experimental space (11) to form an upward-blowing air curtain; a baffle plate (13) is also provided at the opening of the experimental space (11), with the baffle plate (13) located at the top of the opening of the experimental space (11); a receiving groove (131) is provided on the side of the baffle plate (13) near the experimental space (11), and a lifting plate (14) can slide up and down in the receiving groove (131). The lifting plate (14) can be completely retracted into the receiving groove (131) upwards or downwards to cooperate with the baffle plate (13) to close the opening of the experimental space (11); the bottom of the lifting plate (14) is provided with The slope is inclined, with the side of the slope closest to the experimental space (11) tilted upwards; the side of the ventilation cabinet (1) with the lifting plate (14) is provided with a horizontal bar (5), which is located between the storage space (12) and the experimental space (11). The top of the horizontal bar (5) is also provided with a slope, which can fit with the slope at the bottom of the shield (13); the exhaust system includes an exhaust pipe (21), each exhaust pipe (21) corresponding to a ventilation cabinet (1). The exhaust pipe (21) is fixedly connected to the top of the ventilation cabinet (1) and communicates with the experimental space (11); an inclined plate (15) is provided in the experimental space (11), and the two sides of the inclined plate (15) are respectively connected to the experimental space. The two side walls of the space (11) are fixedly connected together. The inclined plate (15) is inclined upward at one end near the shield (13) and fixedly connected to the top side wall of the experimental space (11). The exhaust pipe (21) is located above the shield (13). A vertically set guide plate (16) is fixedly connected to the inclined lower end of the shield (13) away from the shield (13). The two sides of the guide plate (16) are fixedly connected to the two side walls of the experimental space (11). A channel for air flow is left between the side of the guide plate (16) away from the shield (13) and the side wall of the experimental space (11) away from the shield (13). A channel for air flow is also left between the bottom of the guide plate (16) and the bottom side wall of the experimental space (11).

2. The centralized air supply and exhaust system for multiple fume hoods in a laboratory according to claim 1, characterized in that: The ventilation cabinet (1) is also provided with a storage space (12), which is located below the experimental space (11) and is used for storing items; the opening of the storage space (12) and the opening of the experimental space (11) are located on the same side of the ventilation cabinet (1).

3. A centralized air supply and exhaust system for multiple fume hoods in a laboratory according to claim 2, characterized in that: A horizontally arranged partition plate (4) is provided between the experimental space (11) and the storage space (12), and the air curtain trough (33) is fixedly connected to the top of the partition plate (4); the air supply system (3) also includes an air inlet channel (34), which is located inside the partition plate (4) and is connected to the air curtain trough (33); an air inlet pipe (32), which is used to introduce air into the air inlet channel (34); and a connecting pipe (35), which is provided between the air inlet pipe (32) and each ventilation cabinet (1) and connects the air inlet pipe (32) to the air inlet channel (34).

4. A centralized air supply and exhaust system for multiple fume hoods in a laboratory according to claim 3, characterized in that: The two sides of the air inlet channel (34) are aligned with the two ends of the inner hole of the air curtain groove (33); a number of air distribution rods (341) are fixedly connected in the air inlet channel (34), and the air distribution rods (341) are arranged in two groups, each group including multiple air distribution rods (341), and the two groups of air distribution rods (341) are staggered along the width direction of the air inlet channel (34).

5. A centralized air supply and exhaust system for multiple fume hoods in a laboratory according to claim 4, characterized in that: Each fume hood (1) is fixedly connected to three connecting pipes (35), which are arranged along the width of the air inlet channel (34) and are connected to the air inlet pipe (32).

6. A centralized air supply and exhaust system for multiple fume hoods in a laboratory according to claim 5, characterized in that: The exhaust system also includes an exhaust fan, with each ventilation cabinet (1) having an exhaust fan connected to the exhaust pipe (21) at its top; a central pipe (22) connected to multiple exhaust pipes (21); and a waste gas treatment unit (23) for treating the waste gas supplied by the central pipe (22) and then discharging the treated clean air; the air supply system (3) includes an air supply box (31) connected to the air inlet pipe (32); and an air supply fan for supplying air into the air supply box (31) through a pipe; the exhaust end of the waste gas treatment unit (23) is fixedly connected to a three-way pipe (24), one end of which is connected to the waste gas treatment unit (23), one end of which is connected to the air supply box (31), and the other end is connected to the atmosphere.

7. A centralized air supply and exhaust system for multiple fume hoods in a laboratory according to claim 6, characterized in that: It also includes a wind speed sensor, with each experimental space (11) equipped with a wind speed sensor located above the air curtain trough (33); a temperature sensor, with each experimental space (11) equipped with a temperature sensor; an electric heating grid, which is installed in the air supply box (31); and a main control unit, which is connected to the wind speed sensor, the temperature sensor and the electric heating grid.

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