Gas separation: apparatus – Electric field separation apparatus – Electric charge produced by friction
Patent
1996-12-06
1998-03-17
Chiesa, Richard L.
Gas separation: apparatus
Electric field separation apparatus
Electric charge produced by friction
55276, 55520, 361226, 361233, B03C 330
Patent
active
057281998
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In the technical field of air purification, the need for a far-reaching and efficacious separation of not only such air-borne particles that are visible, but also of those extremely fine particles that have a microscopic or ultra-microscopic size, has lately increased markedly. In order to satisfy this need, a particle separating arrangement has been developed which makes use of a set of strips or threads of a polymer material, which are automatically set in motion relative to each other by an air stream passing through the duct, whereby they are rubbed against each other to generate static electricity. In this way, the strips are charged electrostatically, whereby they manage to effectively attract and trap also extremely fine particles carried by the air. These strips are held by a carrier or an insert which extends transversely across the air flow duct and intercepts it, a large amount of pipes or cavities being present in the insert which have the purpose of facilitating the passage of the air through the insert, at the same time as they bring about a substantially even distribution of the air before it comes into contact with the strips, whereby it is guaranteed that substantially all strips in the strip set will work in an efficient manner. However, till now the production of such strip-carrying inserts has been time-consuming and has almost had the character of craftsmanship; something that has caused high costs for the production of the particle separating arrangement in its entirety. Therefore, there exists a pronounced need for a strip-holding insert which may be produced in a simple and inexpensive way.
Further in the field of air purification, there is a need for introducing a simple and cheap insert being capable of silencing sound, into air flow ducts of different sorts. Thus, not seldom annoying sounds arise from the fan that is mounted in or adjacent to the duct and has the purpose of setting the air in motion through the duct. For instance, a smaller electrically drivable fan is mounted in such particle separating arrangements which have the shape of a housing being placeable or mountable in a room, said housing having an inlet and an outlet for the air which fan not seldom causes comparatively high sound levels in the surrounding room where the air flow duct from the fan to some of said in- and outlets is open or non-insulated.
OBJECTS AND FEATURES OF THE INVENTION
The present invention aims at meeting the above-mentioned requirements. Thus, a primary object of the invention is to provide an insert which on one hand works silencing when mounted in an air flow duct and on the other hand may be easily connected to a set of strips or threads of an electrostatically chargeable nature, at the same time as the insert shall be constructively simple in order to be quickly and effectively manufactured and at a low cost. According to the invention, this object is accomplished by the features as defined in the discussed hereinafter.
Advantageous embodiments of the insert according to the invention are further defined in the dependent claims.
BRIEF DESCRIPTION OF THE APPENDED DRAWINGS
In the drawings:
FIG. 1 is a vertical longitudinal section of a particle separating arrangement which makes use of two different embodiments of an insert according to the invention,
FIG. 2 is a perspective view showing a prior art starting workpiece of which the insert according to the invention is made,
FIG. 3 is a similar perspective view showing the same workpiece after shaping,
FIG. 4 is a planar view of the workpiece according to FIG. 3 during initiated winding into a spiral-shaped loop,
FIG. 5 is a planar view showing the finished spiral loop, and
FIG. 6 is a perspective view showing a screw-shaped embodiment of the insert which is preferred for silencing purposes.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION
In FIG. 1, reference numeral 1 generally designates a substantially tube-shaped housing whose internal cavity 2 forms an air flow duct between an inlet
REFERENCES:
patent: 1118237 (1914-11-01), Saint Cyr
patent: 2063743 (1936-12-01), Kamrath
patent: 2277712 (1942-03-01), Otto
patent: 2404789 (1946-07-01), Burk et al.
patent: 2593869 (1952-04-01), Fruth
patent: 3966646 (1976-06-01), Noakes et al.
patent: 4701287 (1987-10-01), Manteufel
patent: 5405422 (1995-04-01), Ueda et al.
Chiesa Richard L.
Freshman AB
Siemens Terrance L.
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