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According to the type of use, exhaust fans can be made as 1500 or 3000 revolutions. In cases where the air in the flow needs to be moved with higher pressure, high pressure exhaust fans or centrifuge exhaust fans are used to transfer materials. These types of strong suckers are produced with a special design of the propeller and have a strong structure in terms of resistance so that they do not have problems at high speeds. Azin Ventilation is able to produce all kinds of suction fans and high speed blower fans with the best quality. https://azintahvieh.blog.ir/1400/12/17/اگزاست-فن- فشار-قوی Why can't a normal exhaust fan be used instead of a high pressure fan and material transfer fan? High pressure fans are used to move air contaminated with dust, saw dust, iron particles and the like. High-pressure exhaust fans differ from simple fans in the number of blades and the absence of a front disk on the impeller. Thicker metal is used to make the fan impeller harder and stronger. For example, 2 to 5 mil sheets are used in the manufacture of medium pressure fan exhaust impellers that work at 1400 rpm, but in the manufacture of high pressure fans for the resistance of the impeller and prevention Steel sheets with thicknesses of 4 to 8 mils are used for ambulances at high speeds. Of course, the thickness of the propeller sheet depends on the diameter of the fan, and according to the type of polluted air and the hardness of the particles, the thickness of the propeller sheet can be determined. For abrasive impurities, armor plates, surface on blades, etc. can be used.
Technical engineer, how to distinguish the aerodynamic characteristics of a fake fan from the real one. Or what the fan creators fear and hide. 1-Let's start with the basics, i.e. From approved GOSTs: According to paragraph 2.11 of GOST 10616-90: The aerodynamic characteristics of the fan should be based on the data of the aerodynamic tests performed in accordance with GOST 10921.
According to GOST 10616-90 item 2.16: For fans operating at different speeds, the working sections of the curve Pv (Q) (1) should be given, drawn on a logarithmic scale, where the lines with constant values of efficiency η (2) should be drawn, power N (3), peripheral speed U (4) of the propeller and its rotational speed n (5) are shown.
If all of the above parameters are not indicated in the aerodynamic specification, one has "accidentally" deviated from the requirements of GOSTs. A legitimate question arises, can such "random" features be trusted and to confirm my opinion, I suggest a simple confirmation method!
I deliberately take the characteristics of VTs 4-75-4 from Soviet literature:
I choose the intersection of the power line N with a logarithmic grid (for more accurate calculation): Point number 1. N≈0.55 kW; Q≈3500 m3/h; Рv≈350 Pa; My efficiency is η≈0.792 I substitute the data into the formula (from GOST 10616, Appendix page 8) and get the efficiency η of the fan:
where ƞ is the coefficient of performance (COP). PV - total pressure, Pa (at the ambient temperature of 20 degrees Celsius); Q - air productivity, thousand m3 per hour; N engine power consumption
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| Company | آذین تهویه |
|---|---|
| Tel | +98 21-0×××4201355, +98 21-0×××4201355 |
| Mobile | +98 919×××1355 |
| Whatsapp link | |
| Instagram page | |
| Website | https://www.azintahvie.com/ |
| Country | Iran |
| Province | Tehran |
| Address | دفتر مرکزی: تهران، بلوار دریا، خ مطهری جنوبی، نبش 18 |
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