Workplace ventilation. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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A radio amateur to do his favorite thing in the apartment is not given the best place, a dark corner or, at best, a closet. If the problem is easily solved with lighting, then with ventilation the situation is much more complicated, an ordinary fan creates comfortable conditions only for the radio amateur himself, but the rest of the family suffers, inhaling all the aromas of amateur radio creativity. To solve this problem to some extent, an attempt was made to manufacture small-sized exhaust ventilation with air ejection outside the common room, it should be minimal in size and produce a low noise level during operation.
To solve this problem, parts of an old computer were used, in particular a hard disk drive and a power supply. The AT type power supply does not need to be modified; when the load is connected, it is ready for operation. The hard disk drive is disassembled (see photo) and the read head assembly is removed from it along with the electromagnetic drive. Next, the disk assembly itself is disassembled directly (in my case, a two-disk one), the washer located between the disks serves to fasten the impeller.
The impeller blades are cut out of 1 mm thick fiberglass and inserted with epoxy glue into slots made with a hacksaw in the washer at a distance of 120 degrees from each other. Next, the impeller is installed on the disk, which is pre-installed on the drive motor shaft. Along the bottom edge (see photo), the impeller blades are also attached to the hard drive using epoxy glue. For better gluing, a second disk can be applied to the impeller and the entire structure fixed with a clamping washer, after a day, necessary for the adhesive to fully harden, the second disc must be removed and the impeller fixed again with a clamping washer.
To remove air in the side wall, a cut is made, into which an empty case is inserted from the contact chip (from the old radio equipment) and fixed in the case also with epoxy glue. Reflective cheeks are cut out of fiberglass with a thickness of 1 mm, the dimensions are selected according to a specific type of drive, inserted into the housing and fixed with glue. A hole with a diameter of 50 mm is cut into the upper removable cover of the drive, which serves as an air intake.
A plastic corrugated hose can be used as an air duct. The outlet of the duct is led outside the room, and if possible into the general ventilation. You can also try to apply a filter from a gas mask by installing it at the outlet of the air duct, I did not try it myself due to the lack of one. In my opinion, this will be the best option, that is, complete autonomy.
Author: I.V. Ankudinov - aiv55 [dog] mail.ru; Publication: cxem.net
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