Coating apparatus – With means to apply electrical and/or radiant energy to work...
Patent
1987-03-23
1988-11-01
Beck, Shrive
Coating apparatus
With means to apply electrical and/or radiant energy to work...
118302, 118326, 427423, 981153, 239 81, 72 56, B05B 1704
Patent
active
047811455
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to coating techniques, and more specifically it deals with detonation deposition apparatuses.
DESCRIPTION OF THE PRIOR ART
Known in the art is a detonation deposition apparatus comprising a sound insulated deposition chamber having a loading opening provided with a movable cover plate which sealingly closes the opening, a plenum ventilation port and an exhaust ventilation port which communicates with atmosphere through an exhaust ventilation system; a sound insulated plenum ventilation chamber having an inlet port and communicating with the deposition chamber through a plenum port of the deposition chamber and with atmosphere through the inlet port and accommodating said exhaust ventilation system; and deposition equipment all accommodated in the deposition chamber and comprising a barrel with an open end communicating with a gas supply system, a batcher of a pulverulent material being deposited and a spark plug, and a means for moving a workpiece with respect to the barrel end which has an electric drive and which is also accommodated in the deposition chamber (cf. International application PCT/SU 85/00021 filed on Mar. 27, 1985).
The walls of the deposition chamber and cover plate of the loading opening in this apparatus are multilayer walls and consist of steel structures with a large mass-to-surface ratio; they are lined with a continuous layer of a sound absorbing material protected with glass fabric and metal net on the side facing towards the deposition equipment, which is a powerful source of noise.
The plenum ventilation chamber walls consist of an outer sheet lining which is internally lined with a sound absorbing material protected with glass fabric and metal net.
The ventilation chamber has a large inner surface, a rather large capacity and adjoins to the wall of the deposition chamber in which the plenum and exhaust ports are provided. The exhaust ventilation system comprises means for cleaning exhaust gases (cyclones) offering a high hydraulic resistance, the free opening of the exhaust air intake of the ventilation system being located in the deposition chamber, in the zone of the open end of the barrel.
Muffling noise generated during operation of the detonation deposition equipment is a very complicated technical problem due to both high general noise level (up to about 140 dBA) and the fact that there is a substantial share of powerful low- and medium-frequency components (in the 32-1000 Hz range) in the pulse noise spectrum, the sound waves at these frequencies moving freely around barriers and passing through slits and apertures (diffraction).
The sound insulation structure in the prior art apparatus makes it possible to lower noise level at all sound frequencies to about 80 dBA. Acoustic oscillations emerging from the plenum port of the deposition chamber are effectively muffled in the plenum chamber owing to an abrupt expansion of the oscillations front in the interior space of the chamber and cooperation with the sound absorbing surface of the walls. The arrangement of the air ducts of the exhaust ventillation system in the sound insulated space of the plenum chamber in combination with the means of cleaning exhaust gases offering a high hydraulic resistance ensures muffling of noise reaching the exhaust port.
This apparatus features a large size of the deposition chamber, it is unwieldy, rugged and heavy-weight, thus hampering the manufacture, assembly and installation and resulting in a substantial production cost. Accommodation of the deposition equipment in the deposition chamber results in difficulties associated with maintenance of the equipment. It is not altogether possible to ensure the real-time adjustment of the batcher of pulverulent material being deposited during deposition of the apparatus.
Accommodation of the electric drive of the means for moving the workpiece in the deposition chamber adversely affects operability and reliability of the drive and impairs safety of the apparatus.
Complete removal of dust (non-deposite
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Amlinsky Roman A.
Fedko Jury P.
Goncharov Alexei A.
Nedelko Vladimir E.
Bashore Alain
Beck Shrive
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