Steel wood fume hood material description and use precautions

Steel wood fume hood material description and use precautions

First, the size of the fume hood

1800/1500/1200*750*2350mm

Second, the main cabinet of the fume hood

1) Upper box: 1.2mm cold-rolled steel plate is bent and stamped, the surface is derusted by oil removal, pickling and phosphating, and the EPOXY protective layer is sprayed with electrostatic powder to make acid and alkali resistant and corrosion-resistant surface treatment. The adhesion of the sprayed EPOXY protective layer is tested by the falling object impact test; the inner lining and the baffle are selected from the 5mm anti-double plate, and the inner part is three-stage exhaust design, which can eliminate the exhaust dead angle and the effective emission of different density gases; The panel is placed on the side panel of the outer column for easy observation and operation.

2) Lower case: The main frame adopts 60*40*1mm rectangular steel pipe to be made into C-shaped steel bracket by carbon dioxide welding, and the connecting support beam adopts 60*40*1mm rectangular steel pipe. The surface is degreased, pickled and phosphatized. Rust treatment, electrostatic powder spray EPOXY protective layer for acid and alkali corrosion resistant surface treatment, its EPOXY protective layer adhesion is tested by falling object impact test; fume hood cabinet body and door panel with 16mm thick high quality environmental protection type MDF, the section is waterproofed by domestic high-quality 2.0mm thick PVC edge sealing, surrounded by chamfer and smooth treatment, the appearance is beautiful and smooth; the cabinet body is made of 16mm thick high-quality environment-friendly melamine board; all sections are sealed by domestic high-quality PVC. Waterproof treatment, the cabinet body plate adopts detachable three-in-one connection, the structure is firm and the bearing capacity is good; the hinge adopts domestic high-quality full-open 90-175 degree high quality chrome-plated steel hinge, when the horizontal angle of the cabinet surface is <15 degrees The door can be closed by itself, the elasticity is good, the appearance is beautiful, there is no noise during use, and it can be opened and closed more than 50,000 times freely; the handle is made of stainless steel handle or PVC word dark handle.

3) Window: ≥5mm thick explosion-proof tempered glass, free to slide, can stay at any position on the track; the main window glass can slide freely left and right for user's operation.

Third, the ventilated countertop

1) Countertop: Imported ceramic countertops, imported epoxy countertops, Trespa, real psychological board, acid and alkali resistant, corrosion resistant; edge thickened to 26mm to prevent liquid spillage.

Four, fume hood accessories

1) Socket: A safety socket with dust-proof, splash-proof protective cover with automatic closing function. The external size is 60×60mm, 10A/16A/220V multi-function socket, suitable for various instruments in the laboratory.

2) Illumination: It adopts circular energy-saving hole lamp, which is hidden on the top plate and does not directly contact with the test gas in the fume hood. It is easy to replace and the brightness fully meets the experimental requirements.

3) Control panel: universal socket, fluorescent lamp, fan, damper opening and closing control.

4) Cup trough: equipped with imported PP cup trough, resistant to acid and alkali, corrosion and organic matter.

5) Faucet: Imported high quality single-mouth faucet; material is pure copper; surface treatment adopts imported epoxy resin powder, not sprayed, acid and alkali resistant, corrosion resistant; water outlet is made of copper and PP, detachable, added Install the bubbler, the gooseneck and the angled outlet pipe can be rotated 360°, with forming thread, which can be connected to special water pipes such as circulation; the valve core is made of precision ceramic valve core, 90° rotation, the service life of the switch is more than 500,000 times. The static maximum pressure is 35 bar; the handle is made of PP material, which is ergonomically designed and comfortable to use.

6) Launching system: It adopts imported high-density PP material submerged water bend, corrosion resistance, acid and alkali resistance and organic matter, and has the function of filtering and blocking odor.

Five, detailed standard of fume hood

1) Cabinet operation door opening height: 0-800 mm

2) Working surface wind speed: 0.4-0.6m/s.

3) Noise: <60db

4) Exhaust air volume: 1080-1700m3/h

5) Working voltage: AC220V-380V

6) Motor power: 0.09-4kw

Note: Each fume hood with damper, reducer, tee, elbow, duct, fan should be calculated separately.

Technical Parameters

Main function of the fume hood

The most important function of the fume hood is the exhaust function. In the chemical laboratory, various harmful gases, odors, moisture and flammable, explosive and corrosive substances are generated during the experimental operation, in order to protect the user. Safety, to prevent the spread of pollutants in the laboratory to the laboratory, the use of fume hoods near the source of pollution, the previous use of fewer fume hoods, only in particularly harmful and dangerous gases and experiments that generate a lot of heat. The fume hood is only responsible for the auxiliary functions of the test bench. In recent years, considering the improvement of the experimental environment, the experiments carried out on the test bench have gradually shifted to the fume hood, which requires the function of the most suitable equipment for use in the fume hood. In particular, most newly built laboratories require air conditioning, so the number of fume hoods to be used in the initial design phase of the building is included in the air conditioning system plan. Since the fume hood occupies a very important position in the biochemical laboratory, the number of fume hoods is rapidly increasing from the aspects of improving the laboratory environment, improving the sanitary conditions and improving the work efficiency, and the ventilation ducts are followed. Piping, wiring, and exhaust are all important issues in laboratory construction.

The main purpose of using a fume hood is to discharge the harmful gases generated in the experiment and protect the health of the experimenter, that is to say, to have a high degree of safety and superior operability, which requires the fume hood to have the following functions:

(1) Release function: It should have the function of using the harmful gas generated inside the fume hood to absorb the gas outside the cabinet, diluting it and then discharging it outside.

(2) Non-backflow function: It should have the function of suppressing the harmful gas from flowing into the room from the inside of the fume hood. In order to ensure the realization of this function, a single fume hood and a ventilator are connected by a single pipe. It is the best method. It cannot be connected by a single pipe. It is also limited to the same room in the same floor. Install at the end of the pipe (or at the top of the floor).

(3) Isolation function: Separate the inside and outside of the fume hood by applying a non-sliding glass window in front of the fume hood.

(4) Supplementary function: There shall be a passage or alternative means for drawing in air from outside the fume hood when harmful gases are exhausted.

(5) Control wind speed function: In order to prevent the harmful gas in the fume hood from escaping, a certain suction speed is required. The factors that determine the suction speed of the air inlet of the fume hood are: the heat generated by the experimental content and the relationship with the number of air changes. The main ones are the experimental content and the nature of the harmful substances. Generally, the generally non-toxic pollutants are 0.25 ~ 0.38m / s, the toxic or dangerous harmful substances are 0.4 ~ 0.5m / s, highly toxic or a small amount of radioactivity is 0.5 ~ 0 The .6m/s helium is 0.5m/s and the granule is 1m/s. In order to ensure such an air speed, the exhaust fan should have the necessary static pressure, ie the frictional resistance of the air as it passes through the fume hood duct. When determining the wind speed, it must also pay attention to the noise problem, that is, when the air flows through the pipe, the noise will be generated within a limit of 7 to 10 m and more than 10 m. Usually the laboratory's indoor background noise level, the noise limit is 70dB. Increasing the cross-sectional area of ​​the pipeline will reduce the wind speed and reduce the noise. Considering the cost of the pipeline and construction problems, the power of the pipeline and the exhaust fan must be carefully selected.

(6) Heat and acid and alkali corrosion resistant fume hood function: There are some electric furnaces in the fume hood, and some experiments produce a large amount of toxic and harmful gases such as acid and alkali, which are extremely corrosive. The countertops, linings, side panels and selected water nozzles and air nozzles of the fume hood should have anti-corrosion function. In the semiconductor industry or corrosive experiments using strong acid such as sulfuric acid, nitric acid, hydrofluoric acid, etc., the overall material of the fume hood must be resistant to acid and alkali, and must be made of stainless steel or PVC material.

Fume hood safety

Safety is the biggest mission pursued by fume hoods. The use of fume hoods in the laboratory is to ensure the safety of users and to prevent pollution to the surrounding environment.

The fume hood must also be safe when in use

Before the experiment begins, it must be confirmed that the fume hood should be in operation for the experimental operation.

At least 5 minutes or more before the end of the experiment, the ventilator can be turned off to drain the residual gas in the pipeline. It is also conceivable to install an exhaust damper to ensure that the ventilator is delayed.

During the experiment, do not put any equipment within 150mm from the glass window. Large experimental equipment should have sufficient space and should not affect the flow of air. The front window should be closed as much as possible.

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