Experiment cabinet with exhaust device
By introducing a negative pressure fan and duct system into the experimental cabinet, the problem of poor ventilation in traditional experimental cabinets has been solved, achieving efficient emission of harmful gases and improving the safety of the experimental environment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2026-03-10
AI Technical Summary
Traditional laboratory cabinets have poor ventilation when dealing with harmful gases and vapors, and cannot create a stable negative pressure environment. Harmful gases can easily spread, affecting laboratory safety and the health of operators.
Design an experimental cabinet with an exhaust system. Utilize a negative pressure fan and duct system to create a negative pressure environment through the hood, drawing in harmful gases and expelling them outdoors. Combine this with a static pressure box to stabilize airflow and optimize the duct layout to improve ventilation efficiency.
It effectively reduces the concentration of harmful gases in the laboratory, protects the health of operators, prevents gas diffusion, reduces noise, and improves ventilation and experimental efficiency.
Smart Images
Figure CN223980512U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of laboratory cabinet technology, specifically to a laboratory cabinet with an exhaust device. Background Technology
[0002] In experimental settings, laboratory cabinets serve as crucial platforms for various experimental operations, and their functionality directly impacts the safety and efficiency of the experiments. Currently, traditional laboratory cabinets exhibit numerous drawbacks when handling experiments involving the generation of harmful gases and vapors.
[0003] In common experimental operations, such as chemical reagent preparation and sample cleaning, various harmful gases and vapors are often generated. However, many laboratory cabinets lack effective ventilation facilities or have flawed ventilation system designs. Some laboratory cabinets rely solely on natural ventilation, which is extremely ineffective and fails to quickly remove harmful gases, leading to a gradual increase in the concentration of harmful gases in the laboratory. This seriously threatens the health of operators, and prolonged exposure to such an environment can easily cause respiratory diseases, poisoning, and other health problems. Other laboratory cabinets, while equipped with simple ventilation devices, often fail to create a stable negative pressure environment. Harmful gases and vapors easily diffuse within the cabinet and may even escape to other areas of the laboratory, expanding the contamination range and affecting the safety of the entire experimental environment. Moreover, existing ventilation systems are not well-designed in terms of duct layout and fan power matching, resulting in low ventilation efficiency and potentially excessive energy consumption. Therefore, there is an urgent need for a new type of laboratory cabinet that can effectively solve the problem of harmful gas and vapor emission, ensuring a safe and clean experimental environment. Utility Model Content
[0004] The purpose of this invention is to provide a laboratory cabinet with an exhaust system to solve the problems existing in the prior art. This solution works based on the principles of air flow and negative pressure. During the cleaning process, when harmful gases and vapors are generated, the fan of the ventilation system starts, creating a negative pressure environment inside the ventilation hood. Under the action of negative pressure, harmful gases and vapors are drawn into the ventilation hood and then exhausted to the outside through the air duct. By continuously drawing in and expelling air, the ventilation cleaning station can maintain the freshness and cleanliness of the air in the cleaning area, effectively reducing the concentration of harmful gases and protecting the health of the operators.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: a laboratory cabinet with an exhaust device, comprising a cabinet body, a water basin at the bottom of the cabinet body, a drain pipe connected to the bottom of the water basin, and a negative pressure exhaust mechanism on the cabinet body, the negative pressure exhaust mechanism comprising a hood, a duct, and a negative pressure fan, the hood being mounted on the cabinet body and covering the water basin, the duct being mounted inside the cabinet body, one end of the duct being connected to the hood, and the other end of the duct being connected to the negative pressure fan, a drip rack and a faucet being mounted on the inner wall of the hood, the faucet being connected to a water supply device.
[0006] To further optimize this utility model, the following technical solutions may be preferred:
[0007] Preferably, a lighting device is provided on the cabinet above the sink, a light switch for controlling the lighting device is provided on the cabinet, and a valve control switch for controlling the negative pressure fan is provided on the cabinet.
[0008] Preferably, the hood includes a back panel, side panels, and a top panel mounted on the cabinet, with the drip rack mounted on the back panel and the side panels mounted on both sides of the back panel.
[0009] Preferably, the cabinet is provided with an outer back panel, and an air duct is formed between the outer back panel and the fan hood. A static pressure box is also provided between the air duct and the negative pressure fan.
[0010] Preferably, the bottom of the hood is connected to the air duct, and the negative pressure fan is located at the top of the cabinet.
[0011] Preferably, the drip rack is located in the middle, and multiple faucets are distributed on both sides of the drip rack.
[0012] The beneficial effects of this utility model are:
[0013] (1) Convenient Operation and Clear Visibility: Lighting equipment and a light switch are installed above the water basin on the cabinet, providing ample and focused light for the experimental operation area. This not only facilitates sample cleaning and reagent preparation at the water basin, ensuring operational accuracy, but also allows researchers to clearly observe detailed changes during the experiment, reducing operational errors caused by insufficient light and improving experimental efficiency. Simultaneously, an independently designed air valve control switch controls the negative pressure fan, allowing researchers to flexibly turn the exhaust system on or off according to experimental needs, ensuring timely removal of harmful gases while rationally controlling energy consumption.
[0014] (2) Optimized hood structure to enhance protective performance: The hood consists of a back panel, side panels, and a top panel. A drip rack is mounted on the back panel, and the side panels are located on either side of the back panel. This structural design effectively encloses the operating area above the water basin, forming a relatively enclosed space and enhancing the collection of harmful gases and vapors. The side panels prevent harmful gases from escaping to the sides, allowing the negative pressure exhaust system to more efficiently draw harmful gases into the duct and exhaust them outdoors, better protecting laboratory personnel from harmful gases and improving the safety of the experimental environment.
[0015] (3) Stable ventilation and reduced noise: By installing an outer back panel on the cabinet to form an air duct between it and the fan hood, and adding a static pressure box between the air duct and the negative pressure fan, the airflow path of the ventilation system is effectively optimized. The static pressure box can stabilize the airflow and reduce wind speed fluctuations, making the airflow drawn in by the negative pressure fan more stable and reducing noise caused by unstable airflow, thus creating a relatively quiet experimental environment for the experimenters. At the same time, stable airflow helps to improve exhaust efficiency, more effectively remove harmful gases, and ensure the freshness and cleanliness of the air inside the experimental cabinet.
[0016] (4) Rational Layout and Efficient Ventilation: The bottom of the hood is connected to the air duct, and the negative pressure fan is located at the top of the cabinet, forming a scientifically sound ventilation layout. This layout utilizes the principle of natural air rise, allowing harmful gases generated inside the hood to flow more smoothly upward through the air duct to the negative pressure fan at the top of the cabinet under negative pressure, and then be exhausted outdoors. Compared to other layout methods, this layout can achieve more efficient air circulation and the emission of harmful gases, further improving the ventilation performance of the laboratory cabinet.
[0017] (5) Rational allocation to meet diverse needs: The drip rack is located in the middle, with multiple faucets distributed on both sides. This layout fully considers the actual needs of experimental operations. The drip rack in the middle makes it convenient for experimenters to place cleaned experimental equipment and let it drip dry naturally. The multiple faucets on both sides can simultaneously meet the cleaning needs of multiple experimenters or various experimental equipment, improving the efficiency of the experimental cabinet and making experimental operations more convenient and efficient. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the experimental cabinet;
[0019] Figure 2 This is the front view of the experimental cabinet;
[0020] Figure 3 This is a schematic diagram of the internal structure of section AA of the experimental cabinet;
[0021] The components include: 1. Cabinet; 2. Water basin; 3. Drain pipe; 4. Drip rack; 5. Faucet; 6. Vent cover; 7. Air duct; 8. Static pressure box; 9. Air valve; 10. Lighting equipment; 11. Air valve actuator; 12. Back panel; 13. Side panel; 14. Top panel; 15. Light switch; 16. Air valve control switch. Detailed Implementation
[0022] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0024] Example 1:
[0025] like Figure 1-3 As shown, an experimental cabinet with an exhaust device includes a cabinet body 1, a water basin 2 installed at the bottom of the cabinet body, a drain pipe 3 connected to the bottom of the water basin, and a negative pressure exhaust mechanism installed on the cabinet body. The negative pressure exhaust mechanism includes a hood 6, an air duct, and a negative pressure fan. The hood 6 is installed on the cabinet body 1 and covers the water basin. The air duct is installed inside the cabinet body, with one end connected to the hood and the other end connected to the negative pressure fan. A drip rack 4 and a faucet 5 are installed on the inner wall of the hood, and the faucet 5 is connected to a water supply device.
[0026] As a preferred embodiment, a lighting device 10 is installed on the cabinet 1 above the water basin, and a light switch 15 for controlling the lighting device is installed on the cabinet. An air valve 9 is installed at the top of the cabinet corresponding to the connection with the main ventilation duct, and an air valve actuator 11 is installed on the outside of the air valve. An air valve control switch 16 for controlling the air valve is installed on the cabinet 1. The lighting device and independent light switch 15 above the water basin provide bright and focused light for sample cleaning, reagent preparation, and other operations around the water basin. This helps researchers clearly observe subtle changes during the experiment, avoiding operational errors caused by dim lighting, and greatly improving the accuracy and efficiency of the operation. The independent air valve control switch allows researchers to flexibly turn the negative pressure fan on or off according to the actual situation of harmful gases generated during the experiment. When harmful gases are generated, the exhaust fan is activated promptly to ensure a safe experimental environment; when no harmful gases are generated, the fan is turned off to reasonably reduce energy consumption and achieve precise control of the ventilation system.
[0027] As a preferred embodiment, the hood includes a back panel 12, side panels 13, and a top panel 14 mounted on the cabinet. A drip rack is mounted on the back panel, and the side panels are mounted on both sides of the back panel. The hood is composed of the back panel, side panels, and top panel, with the drip rack fixed to the back panel and the side panels distributed on both sides. This structure surrounds the operating area above the water basin, forming a relatively enclosed space, which greatly enhances the collection effect of harmful gases and vapors. The side panels effectively block the diffusion of harmful gases to both sides, allowing the negative pressure exhaust mechanism to more efficiently draw harmful gases into the air duct, effectively protecting experimental personnel from harmful gas exposure and improving the safety of the experimental environment.
[0028] As a preferred implementation, an outer back panel is installed on the cabinet 1, and an air duct 7 is formed between the outer back panel and the fan hood. A static pressure box 8 is also provided between the air duct and the negative pressure fan. This design optimizes the airflow path. The static pressure box can stabilize the airflow and reduce wind speed fluctuations. It not only reduces the noise caused by unstable airflow and creates a quiet experimental environment for the experimenters, but also improves the exhaust efficiency, ensuring that harmful gases are discharged more effectively and maintaining fresh air inside the experimental cabinet.
[0029] As a preferred implementation, the bottom of the hood is connected to the air duct, and the negative pressure fan is installed at the top of the cabinet. Natural convection assists exhaust: Utilizing the principle of rising hot air, harmful gases inside the hood are forced upwards through the air duct under negative pressure and exhausted outdoors by the negative pressure fan at the top of the cabinet. Compared to other layouts, this method achieves more efficient air circulation and harmful gas exhaust, further improving the ventilation performance of the laboratory cabinet.
[0030] As a preferred implementation, the drip rack is installed in the middle, and multiple faucets are distributed on both sides of the drip rack. The drip rack in the middle makes it convenient for experimenters to place the cleaned equipment to air dry naturally, and the multiple faucets on both sides can meet the cleaning needs of multiple experimenters or multiple equipment at the same time, which optimizes the use process of the experimental cabinet, improves the efficiency of use, and makes experimental operations more convenient.
[0031] The working principle of this system: This experimental cabinet mainly operates based on the principles of airflow and negative pressure. During the cleaning process, when harmful gases and vapors are generated, the ventilation system's fan starts, creating a negative pressure environment inside the ventilation hood. Under the action of negative pressure, harmful gases and vapors are drawn into the ventilation hood and then exhausted outdoors through the air ducts. By continuously drawing in and expelling air, the ventilation cleaning station can maintain the freshness and cleanliness of the air in the cleaning area, effectively reducing the concentration of harmful gases and protecting the health of operators.
[0032] Functions and effects: (1) Provide a safe operating environment: It can promptly remove harmful gases generated during the cleaning process, such as volatile organic solvent gases, acid and alkali mists, etc., to prevent operators from inhaling harmful gases and reduce harm to the human body. (2) Keep the laboratory clean: It prevents harmful gases from spreading in the laboratory, avoids pollution to other equipment and the environment in the laboratory, and helps maintain the cleanliness and hygiene of the laboratory. (3) Improve cleaning efficiency: Good ventilation conditions can accelerate the evaporation and drying of solvents during the cleaning process, improve cleaning efficiency, and also help reduce the residue on the glassware after cleaning.
[0033] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A fume hood with an exhaust device, comprising a cabinet, characterized in that: The bottom of the cabinet is provided with a water basin, the bottom of the water basin is connected with a drain pipe, the cabinet is further provided with a negative pressure exhaust mechanism, the negative pressure exhaust mechanism comprises a wind cover, an air duct and a negative pressure fan, the wind cover is arranged on the cabinet and covers above the water basin, the air duct is arranged in the cabinet, one end of the air duct is connected with the wind cover, the other end of the air duct is connected with the negative pressure fan, a drip rack and a faucet are arranged on the inner side wall of the wind cover, and the faucet is connected with a water supply device.
2. The fume hood according to claim 1, wherein: The cabinet is provided with a lighting device above the water basin, the cabinet is provided with a lamp switch for controlling the lighting device, and the cabinet is provided with a wind valve control switch for controlling the negative pressure fan.
3. The fume hood of claim 1, wherein: The wind cover comprises a back plate, a side plate and a top plate arranged on the cabinet, the drip rack is arranged on the back plate, and the side plate is arranged on both sides of the back plate.
4. The fume hood of claim 1, wherein: The cabinet is provided with an outer back plate, the air duct is formed between the outer back plate and the wind cover, and a static pressure tank is further arranged between the air duct and the negative pressure fan.
5. The fume hood of claim 1, wherein: The bottom of the wind cover is connected with the air duct, and the negative pressure fan is arranged on the top of the cabinet.
6. The fume hood of claim 1, wherein: The drip rack is arranged in the middle, and the faucet has a plurality of faucets distributed on both sides of the drip rack.