Laboratory fume hood integrating waste gas treatment

Abstract

The utility model relates to a laboratory fume hood integrating waste gas treatment. The laboratory fume hood comprises a fume hood body, a purification mechanism and an exhaust mechanism, the ventilation cabinet body comprises an operation cavity and a water tank cavity, a spraying box is arranged in the water tank cavity, the purification mechanism comprises a filler layer, a spraying layer, a water feeding pipeline, a water discharging pipeline and a water pump, the filler layer comprises an air suction port, a net-shaped frame and a spraying liquid output pipe, the air suction port is communicated with the interior of the operation cavity, and the spraying layer is communicated with the spraying liquid output pipe. The sewer pipeline is respectively communicated with the spraying liquid output pipe and the spraying box; the spraying layer comprises a spraying liquid input pipe and a plurality of atomizing nozzles, one end of the water feeding pipeline is communicated with the spraying liquid input pipe, the other end of the water feeding pipeline is communicated with the spraying box of the water tank cavity, the exhaust mechanism comprises an air driving assembly and an exhaust pipeline, one end of the exhaust pipeline is communicated with the spraying layer of the purification mechanism, and the other end of the exhaust pipeline is communicated with the spraying layer of the purification mechanism. The other end of the exhaust pipeline is provided with an exhaust port, and the air driving assembly is arranged in the exhaust pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of fume hoods and waste gas treatment devices, in particular to a laboratory fume hood with integrated waste gas treatment. Background Art

[0002] Fume hoods are one of the indispensable equipment in the laboratory. They can not only provide a good experimental environment, but also better ensure the personal safety of the experimenters. During the experiment, the fume hood can exhaust and ventilate the toxic and harmful gases to ensure the safety of the entire experiment process. It can effectively prevent laboratory personnel from directly contacting various toxic and harmful gases produced by chemical reactions, and prevent laboratory staff from being harmed by toxic gases, particles, smoke, aerosols and other pollutants.

[0003] Traditional fume hoods use air extraction to dilute the concentration of toxic and harmful gases inside the fume hood, and release the toxic and harmful gases into the external environment through pipe exhaust. In scientific research experiments, during the anaerobic treatment of organic waste, high-temperature pyrolysis of organic matter, and pretreatment of inorganic element detection, high-temperature gases with odor and corrosiveness are often generated. When excessive strong acid reagents are used, toxic acid mist is often generated. Traditional fume hoods only pump these gases to the main pipeline, and then send these gases to a large-scale exhaust gas purification device for treatment, or directly discharge these gases to the outdoors. These emitted gases will not only cause local air pollution, but also bring bad sensory experience to the staff near the laboratory because some gases have a foul smell. More importantly, due to the special physical and chemical properties of exhaust gas, it is also very easy to produce condensation in the indoor pipes, causing condensed water to flow back and damage the laboratory equipment. In addition, the exhaust gas will gradually corrode the exhaust duct, greatly increasing the cost of maintenance and repair. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is to provide a laboratory fume hood with integrated exhaust gas treatment, so that the exhaust gas can be cooled, absorbed and purified by leaching before being discharged into the exhaust duct.

[0005] To achieve the above-mentioned purpose, the utility model provides a laboratory fume hood with integrated exhaust gas treatment, including a fume hood body, a purification mechanism and an exhaust mechanism; the fume hood body includes an operation chamber and a water tank chamber, a spray box is arranged in the water tank chamber, and spray liquid is added to the spray box; the purification mechanism includes a packing layer, a spray layer located above the packing layer, a water supply pipe, a water supply pipe and a water pump, the packing layer includes an air intake port, a mesh frame and a spray liquid output pipe, the air intake port is connected to the inside of the operation chamber, the mesh frame is filled with packing, one end of the water supply pipe is connected to the spray liquid output pipe The spray layer comprises a spray liquid input pipe and a plurality of atomizing nozzles, one end of the spray liquid input pipe is connected to the plurality of atomizing nozzles, one end of the water supply pipe is connected to the spray liquid input pipe, and the other end is connected to the spray box of the water tank chamber, and the water pump is arranged on the water supply pipe; the exhaust mechanism comprises an air drive component and an exhaust duct, one end of the exhaust duct is connected to the spray layer of the purification mechanism, and the other end is provided with an exhaust port, and the air drive component is arranged in the exhaust duct, and can discharge the air in the exhaust duct from the exhaust port.

[0006] Furthermore, an air passage is arranged on the inner wall of the operation chamber, and a plurality of ventilation holes are arranged on the air passage, and the air inlet is connected to the air passage.

[0007] Furthermore, it also includes an air suction mechanism arranged at the air suction port.

[0008] Furthermore, a partition layer between the operating chamber and the water tank chamber is also provided in the inner cavity of the fume hood body.

[0009] Furthermore, a spray liquid discharge port is provided at the bottom of the spray box, and a waste liquid tank located below the spray box is also provided in the water tank chamber, and a waste liquid discharge port is provided at the bottom of the waste liquid tank. Both the spray box and the waste liquid tank are provided with box covers, and a spray liquid addition port and a reagent addition port are provided on the box cover of the spray box, and a waste liquid inlet connected to the spray liquid discharge port is provided on the box cover of the waste liquid tank.

[0010] Furthermore, an acid-base detector is provided in the spray box.

[0011] Furthermore, a first valve and a flow meter are provided on the water supply pipe of the purification mechanism, and a second valve is provided on the water discharge pipe of the purification mechanism.

[0012] Furthermore, a plurality of through holes are provided inside the mesh frame in the packing layer, and the mesh frame is made of plastic, and the packing in the mesh frame is a ball ring.

[0013] Furthermore, the purification mechanism also includes a guide groove arranged on the inner side wall of the spray layer.

[0014] Furthermore, it also includes a control console, which is respectively connected to the water pump and the air drive component for control.

[0015] As described above, the laboratory fume hood with integrated exhaust gas treatment involved in the utility model has the following beneficial effects:

[0016] 1. By setting up a filler spray device, the contact area between the exhaust gas and the spray liquid is greatly increased, the treatment effect of the exhaust gas purification is improved, and the exhaust gas is cooled, absorbed and purified by elution before being discharged into the exhaust duct, so as to avoid laboratory staff from being harmed by toxic gases and greatly reduce the long-term corrosion of the exhaust duct by the exhaust gas.

[0017] 2. By setting up the water tank chamber, the delivery and output cycle of the spray liquid can be completed, so that the spray liquid can be continuously delivered to the packing spray device, improving the continuous purification capacity of the laboratory fume hood with integrated exhaust gas treatment.

[0018] 3. Laboratory fume hoods do not rely on centralized exhaust gas treatment devices and are suitable for application scenarios such as temporary laboratories and small laboratories. They solve the problems of traditional fume hoods that collect gases centrally and treat them through large exhaust gas purification towers, are complex in equipment, are not suitable for isolated laboratories, and have pipeline corrosion problems. They have broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the front view of the fume hood in the utility model.

[0020] Figure 2 It is a side view of the fume hood in the utility model.

[0021] Figure 3 It is a structural schematic diagram of the purification mechanism in the utility model.

[0022] Figure 4 It is a structural schematic diagram of the purification mechanism and the exhaust mechanism in the utility model.

[0023] Description of Figure Numbers

[0024] 1 Fume hood body

[0025] 2 Operating chamber

[0026] 201 Air channel

[0027] 202 Ventilation

[0028] 203 Storage rack

[0029] 3 Water tank chamber

[0030] 301 Spray Box

[0031] 302 Waste tank

[0032] 303 Spray liquid addition port

[0033] 304 Spray liquid discharge port

[0034] 305 Drug Adding Port

[0035] 306 Waste liquid discharge port

[0036] 4. Partition layer

[0037] 5 Purification mechanism

[0038] 501 Spray layer

[0039] 502 packing layer

[0040] 503 Spray liquid inlet pipe

[0041] 504 spray liquid output pipe

[0042] 505 Inlet

[0043] 506 mesh frame

[0044] 507 Atomizing Nozzle

[0045] 508 Diversion channel

[0046] 509 Water supply pipeline

[0047] 510 Sewer

[0048] 511 First Valve

[0049] 512 Second Valve

[0050] 513 Flow Meter

[0051] 514 Water Pump

[0052] 6 Exhaust mechanism

[0053] 601 Air Drive Assembly

[0054] 602 Exhaust duct

[0055] 603 Exhaust port DETAILED DESCRIPTION

[0056] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0057] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0058] See also Figures 1 to 4 The utility model provides a laboratory fume hood with integrated exhaust gas treatment, including a fume hood body 1, a purification mechanism 5 and an exhaust mechanism 6; the fume hood body 1 includes an operation chamber 2 and a water tank chamber 3, a spray box 301 is arranged in the water tank chamber 3, and a spray liquid is added to the spray box 301; the purification mechanism 5 includes a packing layer 502, a spray layer 501 located above the packing layer 502, a water supply pipe 509, a water supply pipe 510 and a water pump 514, the packing layer 502 includes an air intake port 505, a mesh frame 506 and a spray liquid output pipe 504, the air intake port 505 is connected to the inside of the operation chamber 2, the mesh frame 506 is filled with packing, one end of the water supply pipe 510 is connected to the spray liquid output pipe 504, and the other end is connected to the spray box 301 of the water tank chamber 3; the spray layer 501 includes a spray liquid input pipe 503 and a plurality of atomizing nozzles 507, one end of the spray liquid input pipe 503 is connected to the plurality of atomizing nozzles 507, one end of the water supply pipe 509 is connected to the spray liquid input pipe 503, and the other end is connected to the spray box 301 of the water tank chamber 3, and a water pump 514 is arranged on the water supply pipe 509; the exhaust mechanism 6 includes an air drive component 601 and an exhaust duct 602, one end of the exhaust duct 602 is connected to the spray layer 501 of the purification mechanism 5, and the other end is provided with an exhaust port 603, the air drive component 601 is arranged in the exhaust duct 602, and the air in the exhaust duct 602 can be discharged from the exhaust port 603, the air drive component 601 includes a fan, and can also be set to other mechanical structures that increase the gas pressure and discharge the gas.

[0059] The basic working principle of the laboratory fume hood with integrated exhaust gas treatment involved in the utility model is: start the water pump 514 and the air drive component 601. On the one hand, under the action of the air drive component 601, negative pressure is generated in the exhaust duct 602, and the exhaust gas in the operating chamber 2 enters the packing layer 502 of the purification mechanism 5 through the air intake port 505. The packing in the mesh frame 506 can purify the exhaust gas for the first time by contacting and adsorbing the spray liquid falling from the spray layer and the exhaust gas flowing through the packing layer through a large specific surface area. The large specific surface area of ​​the packing can also promote mass transfer and heat transfer between the exhaust gas and the spray liquid. Then the waste gas continues to move upward into the spray layer 501; on the other hand, under the action of the water pump 514, the spray liquid in the spray box 301 is transported to the atomizing nozzle 507 through the water supply pipe 509 and the spray liquid input pipe 503, and the atomizing nozzle 507 sprays the spray liquid in the spray layer 501. At this time, the spray liquid can dissolve and neutralize the strong acidic pollutants in the waste gas, so that the waste gas is purified for the second time through chemical reactions; the waste gas after two purifications will be transported to the external environment through the exhaust duct 602 and the exhaust port 603, and the reacted spray liquid falls to the bottom of the spray layer 501, and can be returned to the spray box 301 through the spray liquid output pipe 504 and the sewer pipe 510, so as to realize the recycling of the spray liquid.

[0060] See also Figures 1 to 4 The present invention is further described below with a specific embodiment:

[0061] In this embodiment, see Figure 1 and Figure 2 As a preferred design, an air passage 201 is provided on the inner wall of the operation chamber 2, and a plurality of ventilation holes are provided on the air passage 201. The air intake port 505 is connected with the air passage 201. The exhaust gas in the operation chamber 2 is sucked into the air passage 201 through the plurality of ventilation holes 202, and then enters the packing layer 502 and the spray layer 501 through the air intake port 505. Ventilation holes are provided on the top, bottom and both sides of the operation chamber 2, which can greatly improve the ventilation effect, thereby further preventing the experimental exhaust gas generated by the operation chamber 2 from drifting to the outside.

[0062] In this embodiment, see Figure 3 As a preferred design, it also includes a suction mechanism arranged at the air intake port 505, which can suck the exhaust gas in the operating chamber 2 into the packing layer 502 and the spray layer 501, thereby improving the suction effect and preventing the exhaust gas from escaping. It can also prevent the spray liquid from entering the air channel 201 and accelerate the discharge of the spray liquid from the purification mechanism 5.

[0063] In this embodiment, see Figure 1 and Figure 2As a preferred design, a partition layer 4 is also provided in the inner cavity of the fume hood body 1 between the operation chamber 2 and the water tank chamber 3. The partition layer 4 can provide support for the operation chamber 2 to facilitate the operation of laboratory personnel. The water tank chamber 3 is located below the partition layer 4, which can make the center of gravity of the laboratory fume hood low and stable.

[0064] In this embodiment, see Figure 1 As a preferred design, a placement rack 203 is also provided in the operating chamber 2, which can hold equipment such as pipette guns and test tube racks for easy access.

[0065] In this embodiment, see Figure 4 As a preferred design, a spray liquid discharge port 304 is provided at the bottom of the spray box 301, and a waste liquid tank 302 located below the spray box 301 is also provided in the water tank chamber 3. The spray box 301 is placed on the waste liquid tank 302, and a waste liquid discharge port 306 is provided at the bottom of the waste liquid tank 302. Both the spray box 301 and the waste liquid tank 302 are provided with a box cover, which can protect and cover the spray liquid and facilitate the inspection of the water level of the spray liquid in the spray box 301 and the waste liquid tank 302. The box cover of the spray box 301 is provided with a spray liquid addition port 303 and a medicine The reagent adding port 305, the box cover of the waste liquid tank 302 is provided with a waste liquid inlet connected to the spray liquid discharge port 304; the spray liquid adding port 303, the spray liquid discharge port 304, the reagent adding port 305, the waste liquid inlet and the waste liquid discharge port 306 can be connected to the water pipe through a threaded pipe joint, which is convenient for adding and discharging the spray liquid, as well as adding the reagent; the reagent adding port 305 can be used to add reagents such as sodium hydroxide, which is convenient for adjusting the pH value of the spray liquid, and can predict the gas that may be generated according to different experiments, so as to configure the spray liquid in advance. When the spray liquid in the spray box 301 needs to be replaced and discharged, it can be stored in the waste liquid tank 302 through the spray liquid discharge port 304 and the waste liquid inlet, and then processed in a centralized manner. By setting the spray box 301 and the waste liquid tank 302, the waste liquid and the washing liquid can be separated, which is convenient for the unified treatment of chemical waste liquid, and is safer and more convenient.

[0066] In this embodiment, see Figure 4 As a preferred design, the spray box 301 is provided with an acid-base detector, which can detect and indicate the pH value of the spray liquid in real time to ensure the stability of the exhaust gas purification.

[0067] In this embodiment, see Figure 4As a preferred design, a first valve 511 and a flow meter 513 are also provided on the water supply pipe 509 of the purification mechanism 5, and a second valve 512 is provided on the water discharge pipe 510 of the purification mechanism 5. The first valve 511 can control the flow rate of the spray liquid, and the second valve 512 can control the reflux rate of the spray liquid; the flow meter 513 can detect the actual flow rate of the spray liquid in the water supply pipe 509 in real time, which is convenient for adjustment; the water supply pipe 509 and the water discharge pipe 510 can be connected by a pipe joint, which is convenient for the transportation and discharge of the spray liquid.

[0068] In this embodiment, see Figure 3 As a preferred design, a plurality of through holes are provided inside the mesh frame 506 in the packing layer 502, and the spray liquid can freely pass through the plurality of through holes, and the mesh frame 506 is made of plastic, which is convenient for processing, has a long service life, and has a low cost of use. Different shapes can also be replaced according to actual use conditions. The packing in the mesh frame 506 is a ball ring, and the ball ring of the mesh frame 506 can be selected in different specifications according to actual use conditions. The ball ring can greatly improve the utilization rate of the inner space and the inner surface of the ring, has small air flow resistance, and greatly increases the specific surface area of ​​the packing; on the one hand, it can increase the contact area between the packing and the exhaust gas, thereby effectively absorbing and adsorbing harmful substances in the exhaust gas and enhancing the exhaust gas purification effect; on the other hand, it can increase the contact area between the spray liquid and the exhaust gas, thereby improving the exhaust gas purification efficiency.

[0069] In this embodiment, see Figure 3 As a preferred design, the purification mechanism 5 also includes a guide groove 508 arranged on the inner wall of the spray layer 501, and the spray liquid remaining on the inner wall of the spray layer 501 can flow to the bottom of the packing layer 502 through the guide groove 508.

[0070] In this embodiment, see Figure 4 As a preferred design, it also includes a control console, which is respectively connected to the water pump 514 and the air drive component 601. The flow rate of the water pump 514 and the wind speed of the air drive component 601 can be linearly adjusted according to the actual situation of the experiment, so as to adapt to different experimental conditions and ensure a good experimental environment; preferably, the flow rate of the water pump 514 is set to 0.7-1.5m / s; preferably, the wind speed of the air drive component 601 is set to 0.3m / s-0.6m / s; the console can also display the data detected by the acid-base detector, so that the staff can monitor the purification of the exhaust gas.

[0071] In this embodiment, see Figure 4 As a preferred design, the exhaust duct 602 is made of polymer material, which has the advantages of light weight, good corrosion resistance, and easy processing and molding. It can increase the service life of the exhaust duct 602 and reduce the cost of use.

[0072] From the above, it can be seen that the laboratory fume hood with integrated exhaust gas treatment of the utility model has the following beneficial effects:

[0073] 1. By setting up a filler spray device, the contact area between the exhaust gas and the spray liquid is greatly increased, and the treatment effect of the exhaust gas purification is improved. The exhaust gas is cooled, absorbed and purified by elution before being discharged into the exhaust duct 602, which prevents laboratory workers from being harmed by toxic gases and greatly reduces the long-term corrosion of the exhaust duct 602 by the exhaust gas.

[0074] 2. By setting up the water tank chamber 3, the delivery and output cycle of the spray liquid can be completed, so that the spray liquid can be continuously delivered to the filler spray device, thereby improving the continuous purification capacity of the laboratory fume hood with integrated exhaust gas treatment.

[0075] 3. Laboratory fume hoods do not rely on centralized exhaust gas treatment devices and are suitable for application scenarios such as temporary laboratories and small laboratories. They solve the problems of traditional fume hoods that collect gases centrally and treat them through large exhaust gas purification towers, are complex in equipment, are not suitable for isolated laboratories, and have pipeline corrosion problems. They have broad application prospects.

[0076] In summary, the utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0077] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A laboratory fume hood with integrated exhaust gas treatment, characterized in that: The invention comprises a fume hood body (1), a purification mechanism (5) and an exhaust mechanism (6); the fume hood body (1) comprises an operation chamber (2) and a water tank chamber (3); a spray box (301) is arranged in the water tank chamber (3), and spray liquid is added to the spray box (301); the purification mechanism (5) comprises a packing layer (502), a spray layer (501) located above the packing layer (502), a water supply pipe (509), a water supply pipe (510) and a water pump (514); the packing layer (502) comprises an air intake port (505), a mesh frame (506) and a spray liquid output pipe (504); the air intake port (505) is connected to the inside of the operation chamber (2); the mesh frame (506) is filled with packing; one end of the water supply pipe (510) is connected to the spray liquid output pipe (504), and the other end is connected to the spray of the water tank chamber (3). The spray layer (501) comprises a spray liquid input pipe (503) and a plurality of atomizing nozzles (507), one end of the spray liquid input pipe (503) is connected to the plurality of atomizing nozzles (507), one end of the water supply pipe (509) is connected to the spray liquid input pipe (503), and the other end is connected to the spray box (301) of the water tank chamber (3), and the water pump (514) is arranged on the water supply pipe (509); the exhaust mechanism (6) comprises an air drive component (601) and an exhaust pipe (602), one end of the exhaust pipe (602) is connected to the spray layer (501) of the purification mechanism (5), and the other end is provided with an exhaust port (603), and the air drive component (601) is arranged in the exhaust pipe (602) and can discharge the air in the exhaust pipe (602) from the exhaust port (603).

2. The laboratory fume hood with integrated exhaust gas treatment according to claim 1, characterized in that: An air passage (201) is provided on the inner wall of the operating chamber (2), and a plurality of ventilation holes are provided on the air passage (201), and the air inlet (505) is in communication with the air passage (201).

3. The laboratory fume hood with integrated exhaust gas treatment according to claim 2, characterized in that: It also includes an air suction mechanism arranged at the air suction port (505).

4. The laboratory fume hood with integrated exhaust gas treatment according to claim 1, characterized in that: The inner cavity of the fume hood body (1) is also provided with a partition layer (4) located between the operating chamber (2) and the water tank chamber (3).

5. The laboratory fume hood with integrated exhaust gas treatment according to claim 1, characterized in that: The bottom of the spray box (301) is provided with a spray liquid discharge port (304); the water tank chamber (3) is further provided with a waste liquid tank (302) located below the spray box (301); the bottom of the waste liquid tank (302) is provided with a waste liquid discharge port (306); both the spray box (301) and the waste liquid tank (302) are provided with a box cover; the box cover of the spray box (301) is provided with a spray liquid addition port (303) and a reagent addition port (305); and the box cover of the waste liquid tank (302) is provided with a waste liquid inlet connected to the spray liquid discharge port (304).

6. The laboratory fume hood with integrated exhaust gas treatment according to claim 1, characterized in that: The spray box (301) is provided with an acid-base detector.

7. The laboratory fume hood with integrated exhaust gas treatment according to claim 1, characterized in that: The water supply pipe (509) of the purification mechanism (5) is also provided with a first valve (511) and a flow meter (513), and the water discharge pipe (510) of the purification mechanism (5) is provided with a second valve (512).

8. The laboratory fume hood with integrated exhaust gas treatment according to claim 1, characterized in that: A plurality of through holes are provided inside the mesh frame (506) in the packing layer (502), and the mesh frame (506) is made of plastic. The packing in the mesh frame (506) is a ball ring.

9. The laboratory fume hood with integrated exhaust gas treatment according to claim 1, characterized in that: The purification mechanism (5) further comprises a guide groove (508) arranged on the inner side wall of the spray layer (501).

10. The laboratory fume hood with integrated exhaust gas treatment according to claim 1, characterized in that: It also includes a control console, which is respectively connected to the water pump (514) and the air drive component (601) for control.

Images