Laboratory hazardous gas leak emergency ventilation system

Abstract

This utility model relates to the field of laboratory ventilation technology and discloses an emergency ventilation device for laboratory hazardous gas leaks. It includes a fixed plate and a ventilation hood. A back plate is fixed to the rear surface of the ventilation hood, and support frames are fixed to both sides of the front end of the fixed plate. The two ends of the back plate are inserted into the support frames, placing the ventilation hood at the front end of the fixed plate. An exhaust port communicating with the interior of the ventilation hood is provided above it. A baffle is horizontally fixed to the lower interior of the ventilation hood, and upward-blowing main fans are installed on both sides of the baffle surface. This utility model's technical solution involves placing a main fan and an auxiliary fan inside the ventilation hood, which is then hung on a wall surface. Ventilation is achieved through the operation of the main fan. When a large amount of hazardous gas is generated during the experiment, the ventilation hood is removed, and the auxiliary fan is simultaneously activated, bringing the ventilation hood closer to the point of hazardous gas generation to forcefully extract and expel the gas, effectively preventing the hazardous gas from diffusing into the indoor air due to untimely extraction.

Description

Technical Field

[0001] This utility model relates to the field of laboratory ventilation technology, specifically an emergency ventilation device for laboratory hazardous gas leaks. Background Technology

[0002] Laboratories are specialized venues for conducting scientific research, teaching, and testing activities. They are equipped with various precision instruments and equipment for researchers and students to perform experiments. Here, people explore the unknown, verify theories, and develop new technologies, providing crucial data and results to support academic progress, technological innovation, and social development. Laboratories often generate harmful gases, such as volatile organic compounds and toxic gases, which can endanger human health and the environment. Therefore, ventilation in laboratories is crucial. Using exhaust fans and ventilation ducts allows for the exchange of indoor and outdoor air, reducing the concentration of harmful gases. The ventilation system needs to be rationally designed to ensure that airflow and velocity meet requirements, and it must be regularly maintained to ensure proper operation and create a safe environment for the laboratory.

[0003] The laboratory's ventilation system meets the ventilation needs during normal use. However, some experiments may generate large amounts of harmful gases in a short period. Since the air inlets of the ventilation system are usually fixed, when a large amount of harmful gas is generated, it may leak rapidly into the indoor air and cannot be promptly removed, thus affecting the health of the experimental personnel. Therefore, we propose an emergency ventilation device for hazardous gas leaks in laboratories. Utility Model Content

[0004] The purpose of this invention is to provide an emergency ventilation device for laboratory hazardous gas leaks. By placing a main fan and an auxiliary fan inside a ventilation hood, which is then hung on a wall surface, ventilation is achieved through the operation of the main fan. When a large amount of hazardous gas is generated during the experiment, the ventilation hood is removed and the auxiliary fan is activated simultaneously. This allows the ventilation hood to be placed close to the point of hazardous gas generation, using strong airflow to extract and expel the hazardous gas. This effectively prevents the hazardous gas from spreading into the indoor air due to untimely extraction, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an emergency ventilation device for laboratory hazardous gas leaks, comprising a fixed plate and a ventilation hood. A back plate is fixed to the rear surface of the ventilation hood, and support frames are fixed to both sides of the front end of the fixed plate. The two ends of the back plate are inserted into the support frames so that the ventilation hood is placed at the front end of the fixed plate. An exhaust port communicating with the interior of the ventilation hood is provided above the ventilation hood. A baffle is horizontally fixed to the lower interior of the ventilation hood. An upward-blowing main fan is installed on both sides of the baffle surface. An upward-blowing auxiliary fan is installed above the baffle between the two main fans. A main switch connected to the main fan and an auxiliary switch connected to the auxiliary fan are also provided.

[0006] By adopting the above technical solution, the fixing plate is fixed to the wall surface, and the ventilation hood is hung at the front end of the fixing plate for exhaust ventilation. When a large amount of harmful gas is generated in the experiment, the ventilation hood is removed and placed above the point where the harmful gas is generated, and the auxiliary fan is turned on at the same time to exhaust ventilation with a strong airflow, so as to prevent the harmful gas from being not extracted in time and spreading into the indoor air.

[0007] Optionally, both the main switch and the auxiliary switch are mounted on the front surface of the ventilation hood, with the auxiliary switch located next to the main switch.

[0008] By adopting the above technical solution, the main fan and the auxiliary fan can be controlled manually by controlling the main switch and the auxiliary switch during use.

[0009] Optionally, the main switch is installed on the front surface of the ventilation hood, while the auxiliary switch is installed on the rear surface of the ventilation hood through an opening on the back plate. The auxiliary switch is a normally closed limit switch. When the back plate is inserted into the support frame, the auxiliary switch is pressed down by the fixing plate and is in a de-energized state.

[0010] By adopting the above technical solution, the main fan is manually controlled by the main switch, while the auxiliary fan is automatically started and stopped when the ventilation cover is removed and hung up by the auxiliary switch.

[0011] Optionally, the front surface of the auxiliary switch is hemispherical, and the hemisphere at the front end of the auxiliary switch protrudes from the surface of the back plate.

[0012] By adopting the above technical solution, when the back plate is attached to the front end of the fixed plate and inserted downward into the support frame, the hemisphere is easily guided to press the auxiliary switch and de-energize it.

[0013] Optionally, mounting holes are provided at each of the four corners of the surface of the fixing plate, and there are four mounting holes.

[0014] By adopting the above technical solution, the mounting plate is fixed by passing expansion bolts through the mounting holes.

[0015] Optionally, the outer ring of the exhaust vent is provided with a raised ring, and the raised ring is provided with at least three rings.

[0016] By adopting the above technical solution, the corrugated pipe can be fitted onto the outer ring of the exhaust port in a non-slip manner using protrusions.

[0017] Optionally, handles are fixed to both sides of the ventilation hood, and two handles are provided.

[0018] By adopting the above technical solution, the ventilation cover can be held by the handle during use.

[0019] Compared with the prior art, the beneficial effects of the technical solution of this application are as follows:

[0020] 1. The technical solution of this application sets up a main fan and an auxiliary fan in a ventilation hood, and hangs the ventilation hood on the wall surface. The ventilation is provided by the operation of the main fan. When a large amount of harmful gas is generated during the experiment, the ventilation hood is removed and the auxiliary fan is started at the same time. The ventilation hood is brought close to the point of generation of harmful gas and the harmful gas is drawn out with a strong airflow. This effectively avoids the spread of harmful gas into the indoor air due to untimely extraction and ensures the health of the experimental personnel.

[0021] 2. The technical solution of this application installs the auxiliary switch at the rear end of the ventilation hood, and the switch is a normally closed limit switch. When the ventilation hood is hung at the front end of the fixing plate, the switch is resisted and in a de-energized state. When the ventilation hood is removed and needs to be used, it will no longer resist the switch, thereby automatically turning on and starting the auxiliary fan, without the need to manually control the switch of the auxiliary fan. Attached Figure Description

[0022] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the laboratory hazardous gas leak emergency ventilation device of this utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of the ventilation hood of the laboratory hazardous gas leak emergency ventilation device of this utility model;

[0025] Figure 3 This is a schematic diagram of the front end structure of the ventilation hood in Embodiment 2 of the emergency ventilation device for laboratory hazardous gas leaks of this utility model;

[0026] Figure 4 This is a schematic diagram of the rear structure of the ventilation hood in Embodiment 2 of the emergency ventilation device for laboratory hazardous gas leakage of this utility model.

[0027] In the diagram: 1. Fixing plate; 11. Support frame; 12. Mounting hole; 2. Ventilation hood; 21. Baffle; 22. Main fan; 23. Auxiliary fan; 24. Exhaust vent; 241. Raised ring; 25. Handle; 26. Main switch; 27. Auxiliary switch; 3. Back plate; 31. Opening. Detailed Implementation

[0028] Example 1

[0029] Please see Figure 1 and Figure 2This utility model provides a technical solution: an emergency ventilation device for laboratory hazardous gas leakage, including a fixing plate 1 and a ventilation hood 2. The fixing plate 1 has four mounting holes 12 at its four corners. When in use, expansion bolts pass through the mounting holes 12 through the four corners of the fixing plate 1, and then the fixing plate 1 is locked to the wall surface.

[0030] A back plate 3 is fixed to the rear surface of the ventilation hood 2, and a support frame 11 is fixed to both sides of the front end of the fixing plate 1. The two ends of the back plate 3 are inserted into the support frame 11 so that the ventilation hood 2 is placed at the front end of the fixing plate 1. A handle 25 is fixed to both sides of the ventilation hood 2. There are two handles 25. The ventilation hood 2 is hung on the front end of the fixing plate 1 for use. The ventilation hood 2 can also be removed for use through the handles 25.

[0031] An exhaust vent 24 communicating with the interior is provided above the ventilation hood 2. In use, a corrugated pipe is fitted onto the exhaust vent 24, and then the corrugated pipe is connected to the exhaust duct. A raised ring 241 is provided around the outer ring of the exhaust vent 24, and the raised ring 241 is provided at least three times to provide a better anti-slip effect when the exhaust vent 24 is connected to the corrugated pipe. When the ventilation hood 2 is removed, the extensibility of the corrugated pipe can ensure that the ventilation hood 2 is always connected to the exhaust duct. A baffle 21 is horizontally fixed at the lower interior of the ventilation hood 2. An upward blowing main fan 22 is installed on both sides of the surface of the baffle 21, and an upward blowing auxiliary fan 23 is installed above the baffle 21 between the two main fans 22. A main switch 26 connected to the main fan 22 and an auxiliary switch 27 connected to the auxiliary fan 23 are also provided. The main switch 26 and the auxiliary switch 27 are both installed on the front surface of the ventilation hood 2, and the auxiliary switch 27 is located on the side of the main switch 26.

[0032] When in use, the main switch 26 and the auxiliary switch 27 are connected to the power supply. When hanging in use, only the main fan 22 is activated by the main switch 26, causing the main fan 22 to start and blow air upwards to draw indoor air for ventilation with low wind power. When a large amount of harmful gas is generated in a short period of time, the ventilation cover 2 is held by the handle 25 and lifted off. Then, the auxiliary fan 23 is activated by the auxiliary switch 27. Both the main fan 22 and the auxiliary fan 23 work and have a greater wind power. Then, the ventilation cover 2 is held directly and placed above the instrument that generates harmful gas, or it is supported and placed above the instrument that generates harmful gas. The strong wind and proximity to the point of harmful gas generation can make the harmful gas be drawn out more quickly and prevent the harmful gas from spreading. After use, the back plate 3 is inserted into the support frame 11 at the front end of the fixing plate 1 to fix the ventilation cover 2. Then, the auxiliary fan 23 can be turned off by the auxiliary switch 27.

[0033] Example 2

[0034] Please see Figure 3 and Figure 4 The only difference from Embodiment 1 is that the main switch 26 is installed on the front surface of the ventilation hood 2, while the auxiliary switch 27 is installed on the rear surface of the ventilation hood 2 through the opening 31 on the surface of the back plate 3. The auxiliary switch 27 is a normally closed limit switch. When the back plate 3 is inserted into the support frame 11, the auxiliary switch 27 is pressed down by the fixing plate 1 and is in a de-energized state. When the ventilation hood 2 is hung and used, the auxiliary fan 23 is in a de-energized state. When the ventilation hood 2 is taken off, the normally closed limit switch 27 will not be pressed down and will be in an energized state, so that the auxiliary fan 23 can be started automatically without manual start.

[0035] The front surface of the auxiliary switch 27 is hemispherical, and the hemispherical part of the front end of the auxiliary switch 27 protrudes from the surface of the back plate 3. After use, when the back plate 3 of the ventilation cover 2 is placed against the lower front end of the fixing plate 1 and inserted downward into the support frame 11, the front end of the hemispherical auxiliary switch 27 is easily guided and pressed, so that it is in the power-off state.

[0036] In use, attach the fixing plate 1 to the wall surface next to the experimental table, and let the expansion bolt pass through the mounting hole 12 through the fixing plate 1 and lock it to the wall surface. Insert the back plate 3 at the rear end of the ventilation hood 2 into the support frame 11 on both sides of the front end of the fixing plate 1 to support and fix the ventilation hood 2. Connect the bellows to the exhaust port 24 and connect the bellows to the laboratory's exhaust duct. Then connect the power cords of the main switch 26 and the auxiliary switch 27 to the power supply. During normal experiments, only the main fan 22 is started by the main switch 26 to make it work and draw air upwards and exhaust it to the outside with a small airflow. When a large amount of harmful gas is generated in a short period of time during the experiment... Immediately grasp the ventilation cover 2 using handle 25 and lift it off. Then, activate the auxiliary fan 23 using auxiliary switch 27. Both the main fan 22 and the auxiliary fan 23 will work, providing greater airflow. Then, hold the ventilation cover 2 directly above the instrument that generates harmful gases, or support it above the instrument that generates harmful gases. By using strong airflow and being close to the point where harmful gases are generated, the harmful gases can be drawn out more quickly, preventing their spread. After use, insert the back plate 3 into the support frame 11 at the front end of the fixing plate 1 to fix the ventilation cover 2. Then, the auxiliary fan 23 can be turned off using auxiliary switch 27.

Claims

1. A laboratory harmful gas leakage emergency ventilation device, comprising a fixing plate (1) and a ventilation cover (2), characterized in that: The rear end surface of the ventilation hood (2) is fixed with a back plate (3), and the front sides of the fixed plate (1) are fixed with support frames (11). The two ends of the back plate (3) are inserted into the support frames (11) so that the ventilation hood (2) is placed at the front end of the fixed plate (1). An exhaust port (24) communicating with its interior is provided above the ventilation hood (2). A baffle (21) is fixed horizontally at the lower interior of the ventilation hood (2). A main fan (22) blowing upward is installed on both sides of the baffle (21). An auxiliary fan (23) blowing upward is installed above the baffle (21) between the two main fans (22). A main switch (26) connected to the main fan (22) and an auxiliary switch (27) connected to the auxiliary fan (23) are also provided.

2. The laboratory harmful gas leak emergency ventilation device according to claim 1, characterized in that: The main switch (26) and the auxiliary switch (27) are both installed on the front surface of the ventilation hood (2), with the auxiliary switch (27) located on the side of the main switch (26).

3. The laboratory hazardous gas leak emergency ventilation device according to claim 1, characterized in that: The main switch (26) is installed on the front surface of the ventilation hood (2), while the auxiliary switch (27) is installed on the rear surface of the ventilation hood (2) through the opening (31) on the surface of the back plate (3). The auxiliary switch (27) is a normally closed limit switch. When the back plate (3) is inserted into the support frame (11), the auxiliary switch (27) is pressed down by the fixing plate (1) and is in a de-energized state.

4. The laboratory hazardous gas leak emergency ventilation device according to claim 3, characterized in that: The front surface of the auxiliary switch (27) is hemispherical, and the hemispherical part of the front end of the auxiliary switch (27) protrudes from the surface of the back plate (3).

5. The laboratory hazardous gas leak emergency ventilation device according to claim 1, characterized in that: The fixing plate (1) has four mounting holes (12) at each of its four corners.

6. The laboratory hazardous gas leak emergency ventilation device according to claim 1, characterized in that: The outer ring of the exhaust vent (24) is provided with a raised ring (241), and the raised ring (241) is provided with at least three rings.

7. The laboratory hazardous gas leak emergency ventilation device according to claim 1, characterized in that: The ventilation hood (2) has handles (25) fixed on both sides of its surface, and there are two handles (25).

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