Exhaust system for laboratory

Abstract

The utility model provides an exhaust system for a laboratory, which comprises a suction unit, a waste gas treatment unit and a waste gas discharge unit, and the suction unit is used for capturing waste gas; the waste gas treatment unit comprises a dust removal mechanism, a spray tower, a drying tower and a carbon adsorption box which are connected in sequence, and the dust removal mechanism is connected with the suction unit; the waste gas discharge unit is connected with the carbon adsorption box and is used for discharging waste gas to the outside; the suction unit comprises a first pipeline, a second pipeline and a main pipeline, the first pipeline is used for being connected with an exhaust outlet of the synthesis experiment cabinet, the second pipeline is connected with a fixed exhaust hood and a universal exhaust hood which are located above the detection experiment operation table, the air inlet end of the main pipeline is connected with the first pipeline and the second pipeline, and the air outlet end of the main pipeline is connected with the dust removal mechanism. The exhaust system for the laboratory, provided by the utility model, can effectively remove pollutants such as smoke dust, flammable and explosive substances, organic non-methane hydrocarbons and the like in waste gas, so that the possibility of safety accidents is reduced, and the safety of the surrounding environment and personnel is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the technical field of exhaust systems, specifically relating to an exhaust system for laboratory use. Background Technology

[0002] Pharmaceutical and chemical laboratories typically conduct chemical reactions such as synthesis, employing methods like evaporation drying and liquid / gas chromatography to analyze and detect relevant substances. Most of the raw materials used in these laboratories possess hazardous characteristics such as flammability, explosiveness, toxicity, and volatile organic compounds. The diverse and varied nature of these experimental raw materials further exacerbates the inherent instability and hazard of the exhaust gases emitted from pharmaceutical and chemical laboratories.

[0003] Existing exhaust systems in pharmaceutical and chemical laboratories mostly employ direct emission or simple carbon adsorption methods for waste gas discharge. These methods cannot scientifically and rationally treat waste gas, causing pollution to the surrounding environment and even posing a significant safety hazard to laboratory personnel and nearby residents. Utility Model Content

[0004] This utility model provides a laboratory exhaust system, which aims to solve the technical problem that the exhaust gas emissions of existing traditional Chinese medicine and chemical laboratories do not meet the standards and pose safety hazards.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a laboratory exhaust system, comprising:

[0006] The suction unit, connected to the experimental equipment, is used to capture and discharge the waste gas generated during the experiment;

[0007] The exhaust gas treatment unit includes a dust removal mechanism, a spray tower, a drying tower, and a carbon adsorption box connected in sequence; the dust removal mechanism is connected to the suction unit.

[0008] The exhaust gas emission unit is connected to the air outlet of the carbon adsorption box and is used to discharge exhaust gas to the outside.

[0009] The suction unit includes a first pipe, a second pipe, and a main pipe. The first pipe is connected to the exhaust port of the synthesis experimental cabinet. The second pipe is connected to a fixed suction hood and a universal suction hood located above the testing experimental operating table. The air inlet of the main pipe is connected to the first pipe and the second pipe, and the air outlet is connected to the air inlet of the dust removal mechanism.

[0010] In one possible implementation, both the first pipeline and the second pipeline are equipped with airflow regulating valves, and the main pipeline is equipped with a static pressure sensor.

[0011] In one possible implementation, the dust removal mechanism includes:

[0012] frame;

[0013] A cyclone dust collector for separating dust from exhaust gas includes a conical cylinder connected to the upper part of a frame, a suction unit connected to the upper end of the outer peripheral wall of the conical cylinder, and a spray tower connected to the top of the conical cylinder; and

[0014] A collection bin, connected to the lower end of the conical cylinder, is used to collect the dust separated by the cyclone dust collector. A discharge device is connected between the collection bin and the conical cylinder.

[0015] In some embodiments, a purging assembly is connected to the lower part of the conical cylinder, the purging assembly comprising:

[0016] An air intake pipe is arranged around the outer wall of the conical cylinder;

[0017] A connecting block, connected to the inner wall of the conical cylinder, has an inner cavity communicating with the air intake pipe; and

[0018] A nozzle is connected to the side wall of the connecting block and communicates with the inner cavity, and the outlet of the nozzle is oriented toward the tangential direction of the conical cylinder.

[0019] In some embodiments, the connecting blocks extend along the direction of the conical cylinder, and multiple connecting blocks are spaced apart circumferentially along the conical cylinder, with each connecting block having multiple nozzles along its extending direction.

[0020] In one possible implementation, the spray tower includes:

[0021] The shell body has a first air inlet pipe connected to the dust removal mechanism at the bottom and an air outlet pipe connected to the drying tower at the top. The outlet of the first air inlet pipe is set downward.

[0022] A first spray pipe is disposed through the side wall of the shell body and extends horizontally into the shell body. The first spray pipe is connected to a plurality of first spray heads, which are located within the shell body and have downward-facing outlets.

[0023] The first filler layer is connected to the shell body and is located between the first air inlet pipe and the first spray pipe.

[0024] In some embodiments, a partition plate is provided in the middle of the shell body, which divides the inner cavity of the shell body into a lower spray chamber and an upper spray chamber;

[0025] The first air inlet pipe, the first spray pipe, and the first packing layer are all disposed in the lower spray chamber. The upper spray chamber is provided with a second packing layer and a second spray pipe from bottom to top. A plurality of second spray heads are connected to the second spray pipe. The air outlet pipe is connected to the upper spray chamber.

[0026] A ventilation pipe is connected to the shell body. The air inlet of the ventilation pipe is connected to the lower spray chamber and is located above the first spray pipe. The air outlet of the ventilation pipe is connected to the upper spray chamber and is located below the second packing layer.

[0027] In one possible implementation, the exhaust gas emission unit includes an exhaust fan connected to the carbon adsorption box and an exhaust duct connected to the exhaust fan, the exhaust duct comprising:

[0028] The lower duct is connected to the air outlet of the exhaust fan, and its upper opening is sealed with a first sealing plate. Multiple first silencer holes are provided through its peripheral wall.

[0029] An upper duct, coaxially positioned above the lower duct, is used to discharge exhaust gas to the outside. The lower opening of the upper duct is sealed with a second sealing plate, and multiple second silencer holes are provided through its peripheral wall.

[0030] A silencer sleeve is fitted around the outer periphery of the lower and upper air ducts, and its inner cavity is connected to the first and second silencer holes.

[0031] In some embodiments, the silencer sleeve is provided with a first perforated plate and a second perforated plate arranged in parallel. The first perforated plate and the second perforated plate are both located between the lower air duct and the upper air duct, and the air holes on the first perforated plate and the air holes on the second perforated plate are arranged alternately.

[0032] In some embodiments, the outer peripheral wall of the silencing sleeve is wrapped with a sound-insulating damping sheet.

[0033] The beneficial effects of the laboratory exhaust system provided by this utility model are as follows: the first and second pipes in the suction unit can specifically capture the exhaust gases generated in different experimental operations, preventing the exhaust gases from spreading in the laboratory and ensuring the air quality of the laboratory; the dust removal mechanism can effectively remove solid particulate matter in the exhaust gases; the spray washing liquid in the spray tower can fully contact the exhaust gases, effectively removing water-soluble pollutants and non-methane hydrocarbon pollutants in the exhaust gases, reducing the pollution level of the exhaust gases; the drying tower dries the exhaust gases after the spray tower treatment, preventing moisture from entering the subsequent carbon adsorption box and affecting the adsorption effect of activated carbon. The activated carbon in the carbon adsorption box can further remove organic pollutants and residual odors in the exhaust gases, so that the exhaust gases are deeply purified and the emitted exhaust gases meet environmental protection standards.

[0034] Compared with existing technologies, the laboratory exhaust system provided by this utility model utilizes a suction unit to draw the waste gas generated during the experiment to a waste gas treatment unit. In the waste gas treatment unit, the waste gas is sequentially subjected to dust removal, washing, drying, and carbon adsorption, effectively removing pollutants such as smoke, flammable and explosive materials, and non-methane organic hydrocarbons from the waste gas. The treated waste gas is then stably discharged through a waste gas emission unit, reducing the possibility of safety accidents, ensuring the safety of the surrounding environment and personnel, and helping pharmaceutical and chemical laboratories achieve green and environmentally friendly sustainable development, avoiding legal risks and economic losses caused by environmental issues. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A schematic diagram of the layout structure of a laboratory exhaust system provided for an embodiment of this utility model;

[0037] Figure 2 This is a schematic diagram of the structure of the conical cylinder and the purging assembly provided in an embodiment of the present utility model;

[0038] Figure 3 This is an embodiment of the present utility model. Figure 2 Schematic diagram of the cross-sectional structure along line AA;

[0039] Figure 4 This is a schematic diagram of the structure of the spray tower provided in an embodiment of the present utility model;

[0040] Figure 5 This is a schematic diagram of the structure of the exhaust gas emission unit provided in an embodiment of the present utility model.

[0041] The following are the labeling elements in the figure:

[0042] 1. Suction unit; 11. First pipeline; 12. Second pipeline; 121. Fixed exhaust hood; 122. Universal exhaust hood; 13. Main pipeline; 14. Air volume regulating valve; 15. Static pressure sensor; 2. Waste gas treatment unit; 21. Dust removal mechanism; 211. Frame; 212. Conical cylinder; 213. Collection bin; 214. Unloader; 22. Spray tower; 221. Shell body; 2211. Partition plate; 222. First air inlet pipe; 223. Air outlet pipe; 224. First spray pipe; 225. First packing layer; 226. Second packing layer; 227. Second spray pipe; 228. Connecting ventilation pipe; 23. Drying tower; 24. Carbon adsorption box; 3. Waste gas emission unit; 31. Exhaust fan; 32. Exhaust duct; 321. Downdraft duct; 3211. First sealing plate; 3212. First silencer hole; 322. Updraft duct; 3221. Second sealing plate; 3222. Second silencer hole; 323. Silencing sleeve; 324. First perforated plate; 325. Second perforated plate; 4. Purging assembly; 41. Air inlet pipe; 42. Connecting block; 43. Nozzle; 10. Synthesis experimental cabinet; 20. Detection experimental operating table. Detailed Implementation

[0043] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0044] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the invention, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0045] Please refer to the following: Figures 1 to 5The present invention provides a laboratory exhaust system. The laboratory exhaust system includes a suction unit 1, a waste gas treatment unit 2, and a waste gas emission unit 3. The suction unit 1 is connected to the experimental equipment and is used to capture and discharge waste gas generated during the experiment. The waste gas treatment unit 2 includes a dust removal mechanism 21, a spray tower 22, a drying tower 23, and a carbon adsorption box 24 connected in sequence. The dust removal mechanism 21 is connected to the suction unit 1. The waste gas emission unit 3 is connected to the outlet of the carbon adsorption box 24 and is used to discharge waste gas to the outside. The suction unit 1 includes a first pipe 11, a second pipe 12, and a main pipe 13. The first pipe 11 is connected to the exhaust port of the synthesis experimental cabinet 10. The second pipe 12 is connected to a fixed exhaust hood 121 and a universal exhaust hood 122 located above the testing experimental operating table 20. The inlet of the main pipe 13 is connected to the first pipe 11 and the second pipe 12, and the outlet is connected to the inlet of the dust removal mechanism 21.

[0046] This embodiment provides a laboratory exhaust system. The suction unit 1, through the arrangement of the first pipe 11 and the second pipe 12, can specifically capture waste gases generated during different experimental operations, preventing the waste gases from spreading within the laboratory and ensuring air quality. The dust removal mechanism 21 effectively removes solid particulate matter from the waste gases. In the spray tower 22, the spray washing liquid fully contacts the waste gases, effectively removing water-soluble pollutants and non-methane hydrocarbon pollutants, reducing the pollution level. The drying tower 23 dries the waste gases after treatment by the spray tower 22, preventing moisture from entering the subsequent carbon adsorption box 24 and affecting the adsorption effect of the activated carbon. The activated carbon in the carbon adsorption box 24 further removes organic pollutants and residual odors from the waste gases, achieving deep purification and ensuring that the emitted waste gases meet environmental standards.

[0047] Compared with existing technologies, the laboratory exhaust system provided by this utility model utilizes a suction unit 1 to extract waste gas generated during experiments to a waste gas treatment unit 2. In the waste gas treatment unit 2, the waste gas is sequentially subjected to dust removal, washing, drying, and carbon adsorption, effectively removing pollutants such as smoke, flammable and explosive materials, and non-methane organic hydrocarbons from the waste gas. The treated waste gas is then stably discharged through a waste gas emission unit 3, reducing the possibility of safety accidents, ensuring the safety of the surrounding environment and personnel, and helping pharmaceutical and chemical laboratories achieve green and environmentally friendly sustainable development, avoiding legal risks and economic losses caused by environmental issues.

[0048] In this embodiment, in order to meet the exhaust requirements of different workstations in the pharmaceutical and chemical laboratory, the suction unit 1 is set in the form of the first pipeline 11 and the second pipeline 12 connected in parallel and then combined to the main pipeline 13. Depending on the number of synthesis experimental cabinets 10 and testing experimental workbenches 20, multiple first pipelines 11 and second pipelines 12 can be set.

[0049] In chemical synthesis experiments, researchers use various chemical reagents to synthesize new compounds or materials through specific chemical reactions. The synthesis chamber 10 provides a relatively independent and controllable space for these experiments. Since synthesis experiments often generate a large amount of complex harmful gases, directly connecting the first pipe 11 to the exhaust vent of the synthesis chamber 10 allows for rapid and effective capture of the waste gases generated within the chamber, preventing their accumulation and diffusion into the laboratory space and protecting the health of the researchers.

[0050] The compounds prepared in the synthesis chamber 10 are subsequently transferred to the testing workbench 20 for quality analysis, testing, and characterization to ensure the products meet quality standards. A fixed exhaust hood 121 is fixedly installed above the testing workbench 20, providing basic ventilation. A 360° rotating and extendable flexible exhaust arm 122 can precisely locate the pollution source for localized, instantaneous high-concentration exhaust gas emissions. The combination of the fixed exhaust hood 121 and the 360° adjustable exhaust hood 122 ensures comprehensive exhaust gas emission during the testing process, guaranteeing a safe experimental environment.

[0051] The drying tower 23 has multiple desiccant layers arranged vertically inside. These layers contain color-changing silica gel desiccants, which effectively adsorb moisture and liquid pollutants from the exhaust gas. When the desiccant layer turns pink, it indicates that it has reached moisture saturation and needs to be replaced or regenerated to restore its blue color before continued use. A level gauge is located in the lower middle part of the drying tower 23, and a drain valve is located at the bottom to monitor and drain accumulated waste liquid within the drying tower 23.

[0052] The activated carbon adsorption box 24 is equipped with multiple layers of activated carbon with a D90 or higher specification. This effectively adsorbs residual non-methane total hydrocarbon pollutants and gaseous components with distinctive odors from the exhaust gas, ensuring that the final exhaust emissions meet environmental protection requirements. The activated carbon adsorption box 24 features a quick-release drawer design, facilitating rapid and timely replacement of the activated carbon, ensuring its adsorption capacity, and reducing labor intensity.

[0053] For example, both the first pipeline 11 and the second pipeline 12 are equipped with air volume regulating valves 14, and the main pipeline 13 is equipped with a static pressure sensor 15.

[0054] By adjusting the airflow regulating valves 14 on the first pipe 11 and the second pipe 12, the exhaust airflow of the corresponding pipe can be flexibly adjusted according to the amount and concentration of exhaust gas generated by different experimental equipment or operations. At the same time, different experimental operations may be carried out at different times, and the airflow regulating valves 14 can be used to conveniently adjust the exhaust status of each pipe in real time to meet the exhaust requirements of different experimental operations.

[0055] The static pressure sensor 15 on the main pipeline 13 can monitor the static pressure in the main pipeline 13 in real time. By acquiring static pressure data, the operating status of the exhaust system can be understood in a timely manner, and it can be determined whether there are problems such as blockage or excessive resistance in the system.

[0056] It should be noted that the exhaust system also includes a PLC controller, and each airflow regulating valve 14 and static pressure sensor 15 are electrically connected to the PLC controller. The static pressure sensor 15 sends the monitoring data as a feedback signal to the PLC controller, which facilitates the PLC controller to automatically adjust the operating parameters of each airflow regulating valve 14, realizes intelligent control of the exhaust system, ensures that the system operates in the best condition, and improves the stability and reliability of the exhaust system.

[0057] In some embodiments, the dust removal mechanism 21 described above may employ, for example... Figure 1 The structure shown. See also Figure 1 The dust removal mechanism 21 includes a frame 211, a cyclone dust collector, and a collection bin 213. The cyclone dust collector is used to separate dust from the exhaust gas. It has a conical cylinder 212 connected to the upper part of the frame 211, a suction unit 1 connected to the upper end of the outer peripheral wall of the conical cylinder 212, and a spray tower 22 connected to the top of the conical cylinder 212. The collection bin 213 is connected to the lower end of the conical cylinder 212 and is used to collect the dust separated by the cyclone dust collector. A discharge device 214 is connected between the collection bin 213 and the conical cylinder 212.

[0058] Cyclone dust collectors utilize the principle of centrifugal force to effectively separate dust from exhaust gas. Dust-laden exhaust gas enters tangentially from the upper end of the outer peripheral wall of the conical cylinder 212, where it rotates. Under centrifugal force, the dust particles are thrown against the inner wall of the conical cylinder 212 and fall down its surface. The purified exhaust gas then exits from the top of the conical cylinder 212 and enters the spray tower 22 for further treatment. By installing a cyclone dust collector, larger dust particles can be effectively removed, reducing the burden on subsequent processing equipment and protecting other equipment from dust wear and clogging.

[0059] The collection chamber 213 is used to collect the dust separated by the cyclone dust collector. The unloader 214 adopts a shut-off fan structure, which can ensure that the dust falls smoothly into the collection chamber 213 while effectively preventing outside air from entering the cyclone dust collector, thus avoiding disrupting the negative pressure state inside the cyclone dust collector and affecting the dust removal efficiency. It should be noted that the negative pressure inside the cyclone dust collector is powered by the subsequent exhaust gas emission unit 3.

[0060] A material level detector is connected to the lower middle part of the conical cylinder 212. The material level detector is used to monitor the accumulation height of dust inside the conical cylinder 212 and feeds back the electrical signal to the PLC controller, so that the PLC controller can interlock and control the start and stop of the unloader 214.

[0061] In some embodiments, the conical cylinder 212 may be adopted as follows: Figure 2 and Figure 3 The structure shown. See also Figure 2 and Figure 3 The lower part of the conical cylinder 212 is connected to a purging assembly 4, which includes an air inlet pipe 41, a connecting block 42, and a nozzle 43. The air inlet pipe 41 is arranged around the outer wall of the conical cylinder 212. The connecting block 42 is connected to the inner wall of the conical cylinder 212 and has an inner cavity that communicates with the air inlet pipe 41. The nozzle 43 is connected to the side wall of the connecting block 42 and communicates with the inner cavity. The outlet of the nozzle 43 is arranged in the tangential direction of the conical cylinder 212.

[0062] When the unloader 214 opens, allowing the dust separated inside the conical cylinder 212 to fall downwards into the collection bin 213, compressed gas is supplied into the inner cavity of the connecting block 42 through the air inlet pipe 41, and then sprayed out from the nozzle 43 along the tangential direction of the inner wall of the conical cylinder 212, so as to blow away the inner wall of the conical cylinder 212, prevent dust from adhering to and accumulating on the inner wall of the conical cylinder 212, and avoid affecting the separation effect and normal operation of the cyclone dust collector due to excessive dust accumulation.

[0063] An air inlet pipe 41 is equipped with a control valve, which is electrically connected to the PLC controller. When the level detector detects that the dust accumulation inside the conical cylinder 212 has reached a preset height, the unloader 214 is activated via the PLC controller, and the control valve is opened simultaneously. This allows the blowing assembly 4 to effectively blow the inner wall of the conical cylinder 212, ensuring that all the dust accumulated inside the conical cylinder 212 can enter the collection chamber 213, thus guaranteeing the stability of the dust removal effect.

[0064] In some embodiments, the connecting block 42 extends along the direction of the conical cylinder 212, and multiple connecting blocks 42 are spaced apart circumferentially along the conical cylinder 212. Each connecting block 42 is provided with multiple nozzles 43 along its extending direction.

[0065] In this embodiment, there are four connecting blocks 42, and each connecting block 42 is provided with 6-9 nozzles 43. The nozzles 43 on each connecting block 42 face the same direction, so that the blowing range of the nozzles 43 on each connecting block 42 can cover the entire circumference of the conical cylinder 212, avoiding blind spots and ensuring that the entire inner wall of the conical cylinder 212 can be effectively blown.

[0066] In some embodiments, the spray tower 22 described above can be as follows: Figure 4 The structure shown. See also Figure 4 The spray tower 22 includes a shell body 221, a first spray pipe 224, and a first packing layer 225. The lower part of the shell body 221 is connected to a first air inlet pipe 222 connected to a dust removal mechanism 21, and the top part is connected to an air outlet pipe 223 connected to a drying tower 23. The outlet of the first air inlet pipe 222 is downward. The first spray pipe 224 is arranged through the side wall of the shell body 221 and extends horizontally into the shell body 221. The first spray pipe 224 is connected to a plurality of first spray heads, which are located inside the shell body 221 and have their outlets downward. The first packing layer 225 is connected inside the shell body 221 and is located between the first air inlet pipe 222 and the first spray pipe 224.

[0067] After being dusted by the dust removal mechanism 21, the exhaust gas enters the shell body 221 through the first air inlet pipe 222 and flows upward and diffuses through the first packing layer 225. At the same time, the first spray pipe 224 sprays washing liquid onto the first packing layer 225 through the spray head. The washing liquid comes into contact with the exhaust gas on the first packing layer 225 and undergoes a diffusion exchange reaction to wash and purify the exhaust gas, thereby effectively removing various flammable, explosive, toxic, harmful and non-methane hydrocarbon pollutants from the exhaust gas.

[0068] For example, a partition plate 2211 is provided in the middle of the shell body 221, which divides the inner cavity of the shell body 221 into a lower spray chamber and an upper spray chamber; the first air inlet pipe 222, the first spray pipe 224 and the first packing layer 225 are all arranged in the lower spray chamber, and the second packing layer 226 and the second spray pipe 227 are arranged sequentially from bottom to top in the upper spray chamber. Several second spray heads are connected to the second spray pipe 227, and the air outlet pipe 223 is connected to the upper spray chamber; a connecting ventilation pipe 228 is connected to the shell body 221, the air inlet of the connecting ventilation pipe 228 is connected to the lower spray chamber and is located above the first spray pipe 224, and the air outlet of the connecting ventilation pipe 228 is connected to the upper spray chamber and is located below the second packing layer 226.

[0069] In this embodiment, the partition plate 2211 divides the interior of the shell body 221 into a lower spray chamber and an upper spray chamber, allowing the exhaust gas to undergo two stages of spray treatment without interference from bottom to top. The exhaust gas enters the shell body 221 through the first air inlet duct 222, undergoes spray treatment in the lower spray chamber, and then enters the upper spray chamber through the connecting ventilation duct 228 for secondary spray purification. Finally, it is discharged through the air outlet duct 223 at the top of the shell body 221. This two-stage spray treatment method can more thoroughly remove various pollutants from the exhaust gas, enhance the exhaust gas treatment effect, and improve the purification efficiency of the exhaust gas.

[0070] Specifically, the second spray pipe 227 and the first spray pipe 224 are interconnected outside the housing 221 and are connected to a flow valve to adjust the flow rate of the washing liquid according to the amount of exhaust gas emitted. The lower and upper spray chambers are respectively connected to a level gauge and a drain valve to monitor and discharge the waste liquid after spraying. The flow valve, level gauge, and drain valve are electrically connected to a PLC controller to achieve automatic control of the exhaust gas treatment unit 2.

[0071] Furthermore, a demister is also installed in the upper spray chamber. During the spraying process, a large amount of water mist is generated. The demister can effectively intercept and capture this water mist, significantly reducing the moisture content of the exhaust gas after spraying treatment, reducing the burden on the subsequent drying tower 23, and ensuring the drying efficiency of the exhaust gas. The demister can be one of a baffle plate demister, a wire mesh demister, or a cyclone plate demister.

[0072] In some embodiments, the exhaust gas emission unit 3 described above may employ, for example... Figure 5 The structure shown. See also Figure 5 The exhaust gas emission unit 3 includes an exhaust fan 31 connected to the carbon adsorption box 24 and an exhaust duct 32 connected to the exhaust fan 31. The exhaust duct 32 includes a lower duct 321, an upper duct 322, and a silencer sleeve 323. The lower duct 321 is connected to the outlet end of the exhaust fan 31, and its upper opening is sealed with a first sealing plate 3211. Multiple first silencer holes 3212 are provided through its peripheral wall. The upper duct 322 is coaxially located above the lower duct 321 and is used to discharge exhaust gas to the outside. The lower opening of the upper duct 322 is sealed with a second sealing plate 3221, and multiple second silencer holes 3222 are provided through its peripheral wall. The silencer sleeve 323 is sleeved on the outer periphery of the lower duct 321 and the upper duct 322, and its inner cavity is connected to the first silencer holes 3212 and the second silencer holes 3222.

[0073] In this embodiment, the exhaust fan 31 provides the power for exhaust gas discharge to the entire exhaust system, while ensuring the negative pressure dust removal state within the cyclone dust collector. The exhaust fan 31 is electrically connected to the PLC controller via a communication module. The PLC controller adjusts the operating parameters of the exhaust fan 31 in real time based on the feedback signal from the static pressure sensor 15 on the main pipeline 13, ensuring the stable operation of the exhaust system.

[0074] The exhaust fan 31 is connected to the carbon adsorption box 24 by a flexible connection, and the bottom of the exhaust fan 31 is connected to the laboratory by a shock absorber, which effectively isolates and absorbs the vibration and noise of the exhaust fan 31 during operation, reduces the impact on the laboratory environment, and ensures the stability of the exhaust gas emission unit 3.

[0075] The exhaust duct 32 has a noise reduction structure. Specifically, exhaust gas enters the lower duct 321 from the exhaust fan 31 and flows upward along the lower duct 321. Since the upper opening of the lower duct 321 is blocked by the first sealing plate 3211, the exhaust gas enters the noise reduction sleeve 323 horizontally through the first noise reduction hole 3212 on the peripheral wall of the lower duct 321, and flows upward along the inner cavity of the noise reduction sleeve 323. Then, it enters the upper duct 322 horizontally through the second noise reduction hole 3222 on the peripheral wall of the upper duct 322, and is finally discharged to the outside along the upper duct 322. In the above process, the exhaust gas undergoes multiple changes in flow direction, realizing multiple buffering of airflow pulsation, thereby effectively reducing the noise generated by the gas flow in the exhaust duct 32.

[0076] The exhaust duct 32 enables the final air discharge of exhaust gases. An online detection sensor is installed on the upper duct 322 to collect real-time data on the concentration of flammable and explosive components in the exhaust gas, allowing for timely understanding of the exhaust quality and evaluation of the exhaust system's operational effectiveness. The online detection sensor is electrically connected to a PLC controller. When the concentration of relevant flammable and explosive gases exceeds the laboratory system's safety settings, the PLC controller automatically interlocks to increase the speed of the exhaust fan 31 and the opening of each airflow regulating valve 14, facilitating the emergency discharge of hazardous gases from the laboratory and ensuring a safe laboratory environment.

[0077] In some embodiments, the silencer sleeve 323 is provided with a first perforated plate 324 and a second perforated plate 325 arranged in parallel. The first perforated plate 324 and the second perforated plate 325 are both located between the lower air duct 321 and the upper air duct 322, and the air holes on the first perforated plate 324 and the air holes on the second perforated plate 325 are arranged alternately.

[0078] As the exhaust gas flows upward along the inner cavity of the silencer sleeve 323, it passes through the first perforated plate 324 and the second perforated plate 325 in sequence. Because the air holes on the first perforated plate 324 and the second perforated plate 325 are staggered, the airflow will continuously change direction and speed, which can more effectively attenuate sound waves and improve the noise reduction performance of the silencer sleeve 323.

[0079] Furthermore, the outer peripheral wall of the silencing sleeve 323 is wrapped with a sound-insulating damping sheet.

[0080] The sound-insulating damping sheet can effectively block sound from propagating outward through the outer peripheral wall of the sound-absorbing sleeve 323, thereby reducing the noise level of the environment around the sound-absorbing sleeve 323 and further improving the sound insulation performance of the exhaust duct 32 on the basis of reducing airflow noise.

[0081] In addition, the silencer sleeve 323 may vibrate when airflow passes through it. The sound insulation damping plate has good damping characteristics, which can suppress the vibration of the outer wall of the silencer sleeve 323, avoid the generation of additional noise caused by vibration, and also help to extend the service life of the silencer sleeve 323, thereby increasing the stability of the entire ventilation system.

[0082] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A laboratory exhaust system, characterized in that, include: The suction unit, connected to the experimental equipment, is used to capture and discharge the waste gas generated during the experiment; The exhaust gas treatment unit includes a dust removal mechanism, a spray tower, a drying tower, and a carbon adsorption box connected in sequence; the dust removal mechanism is connected to the suction unit. The exhaust gas emission unit is connected to the air outlet of the carbon adsorption box and is used to discharge exhaust gas to the outside. The suction unit includes a first pipe, a second pipe, and a main pipe. The first pipe is connected to the exhaust port of the synthesis experimental cabinet. The second pipe is connected to a fixed suction hood and a universal suction hood located above the testing experimental operating table. The air inlet of the main pipe is connected to the first pipe and the second pipe, and the air outlet is connected to the air inlet of the dust removal mechanism.

2. The laboratory exhaust system as described in claim 1, characterized in that, Both the first and second pipelines are equipped with airflow regulating valves, and the main pipeline is equipped with a static pressure sensor.

3. The laboratory exhaust system as described in claim 1, characterized in that, The dust removal mechanism includes: frame; A cyclone dust collector for separating dust from exhaust gas includes a conical cylinder connected to the upper part of a frame, a suction unit connected to the upper end of the outer peripheral wall of the conical cylinder, and a spray tower connected to the top of the conical cylinder; and A collection bin, connected to the lower end of the conical cylinder, is used to collect the dust separated by the cyclone dust collector. A discharge device is connected between the collection bin and the conical cylinder.

4. A laboratory exhaust system as described in claim 3, characterized in that, The lower part of the conical cylinder is connected to a purging assembly, which includes: An air intake pipe is arranged around the outer wall of the conical cylinder; A connecting block, connected to the inner wall of the conical cylinder, has an inner cavity communicating with the air intake pipe; and A nozzle is connected to the side wall of the connecting block and communicates with the inner cavity, and the outlet of the nozzle is oriented toward the tangential direction of the conical cylinder.

5. A laboratory exhaust system as described in claim 4, characterized in that, The connecting block extends along the direction of the conical cylinder, and multiple connecting blocks are spaced apart along the circumference of the conical cylinder. Each connecting block is provided with multiple nozzles along its extension direction.

6. A laboratory exhaust system as described in claim 1, characterized in that, The spray tower includes: The shell body has a first air inlet pipe connected to the dust removal mechanism at the bottom and an air outlet pipe connected to the drying tower at the top. The outlet of the first air inlet pipe is set downward. A first spray pipe is disposed through the side wall of the shell body and extends horizontally into the shell body. The first spray pipe is connected to a plurality of first spray heads, which are located within the shell body and have downward-facing outlets. The first filler layer is connected to the shell body and is located between the first air inlet pipe and the first spray pipe.

7. A laboratory exhaust system as described in claim 6, characterized in that, A partition plate is provided in the middle of the shell body, which divides the inner cavity of the shell body into a lower spray chamber and an upper spray chamber; The first air inlet pipe, the first spray pipe, and the first packing layer are all disposed in the lower spray chamber. The upper spray chamber is provided with a second packing layer and a second spray pipe from bottom to top. A plurality of second spray heads are connected to the second spray pipe. The air outlet pipe is connected to the upper spray chamber. A ventilation pipe is connected to the shell body. The air inlet of the ventilation pipe is connected to the lower spray chamber and is located above the first spray pipe. The air outlet of the ventilation pipe is connected to the upper spray chamber and is located below the second packing layer.

8. A laboratory exhaust system as described in claim 1, characterized in that, The exhaust gas emission unit includes an exhaust fan connected to the carbon adsorption box and an exhaust duct connected to the exhaust fan, the exhaust duct including: The lower duct is connected to the air outlet of the exhaust fan, and its upper opening is sealed with a first sealing plate. Multiple first silencer holes are provided through its peripheral wall. An upper duct, coaxially positioned above the lower duct, is used to discharge exhaust gas to the outside. The lower opening of the upper duct is sealed with a second sealing plate, and multiple second silencer holes are provided through its peripheral wall. A silencer sleeve is fitted around the outer periphery of the lower and upper air ducts, and its inner cavity is connected to the first and second silencer holes.

9. A laboratory exhaust system as described in claim 8, characterized in that, The silencer sleeve is provided with a first perforated plate and a second perforated plate arranged in parallel. The first perforated plate and the second perforated plate are both located between the lower air duct and the upper air duct, and the air holes on the first perforated plate and the air holes on the second perforated plate are arranged alternately.

10. A laboratory exhaust system as described in claim 9, characterized in that, The outer peripheral wall of the silencing sleeve is wrapped with a sound-insulating damping sheet.

Images