Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1985-10-08
1987-11-24
Feldbaum, Ronald
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15346, A47L 514
Patent
active
047078790
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a device for acting on or treating surfaces by a medium, preferably air, which is supplied to the device via one inlet or several inlets and is sucked away through one outlet or several outlets.
In particular, a device according to the invention can be used as a suction nozzle for picking up material, such as dust, gravel, leaves, garbage, and heat and moisture or the like from surfaces or for cleaning surfaces by means of quickly rotating particles mixed with air or for treatment of surfaces by adding air-borne particles, such as paint powder, or gases.
Known devices of the above type have several drawbacks. For instance when taking up particle matter for pneumatic conveying there is a need for a large quantity of exhaust air and large sub-atmospheric pressures in order to achieve sufficient flow velocity for removal of heavy particles, such as cement and corn. The nozzles presently used are so designed that a uniform distribution of the inflow velocity is dependent on the shape of the surface of the material and the local geometry.
Using known devices means that it is difficult on uneven surfaces to pick up and remove for instance solid, air-borne particles, dust, heat and so on or larger particles, such as litter, leaves or garbage. The devices work well only when the outlet ports are smooth and narrow, and they need smooth surfaces, large sub-atmospheric pressure, high air speed and comparatively large flows, which means large power consumption. Furthermore, they are of a rather complicated design and are provided with particular inner baffle plates to equalize the air inlet flow. Because the ports are narrow these devices will easily clog, and the field of application is limited. Moreover, particles of large size, as leaves or garbage, can cause stoppage.
Known devices for spreading air-borne particles, for instance paint powders, are used in electrostatic spraying processes. The powder paint is sprayed onto electrostatically charged details, sometimes by several spray guns. A fraction of the paint, which is also electrostatically charged, adheres to the details but the major part falls down and is conveyed to a recovery system. A device according to the invention can be used as a vortex chamber for spreading the pulverulent particles uniformly in the chamber and it makes it possible to apply paint powder to large surfaces. The cloud of paint will be kept rotating in the zone enclosed by the vortex chamber which will be exposed to a low sub-atmospheric pressure.
The object of the device according to the invention is preferably to provide a feeding nozzle which is built-up according to the push-pull principle and which is far less sensitive than known nozzles since the inflow velocity is created by means of a compressed-air jet. Thus, a surface covered by particle matter need not be smooth for an even inflow velocity to be obtained. Because of the favourable aerodynamic shape and the function of the nozzle according to the invention the power ratio when using the same input power will be much larger than in the known nozzles.
The characteristics of the device according to the invention will appear in the following claims.
The advantages of a device according to the invention are that because of the push-pull principle the device is not sensitive to unevenness of the surface and thus, an even inflow velocity is achieved independently of the condition of the surface. Further, the device works effectively also by using wide openings so that also large particles easily can be sucked into the nozzle.
A low sub-atmospheric pressure is sufficient for picking up and removing particles, and there is no need for large flows for removing the particles. The power consumption of the device according to the invention when used as a suction nozzle is low and the construction is simple, insensitive and reliable in operation. It cannot be clogged because its function is not dependent on ports which are small. A device according to the invention designed as a suction nozzle has a wide area of u
REFERENCES:
patent: 789768 (1905-05-01), Sullivan
patent: 2238541 (1941-04-01), Spagnolo
patent: 3238557 (1966-03-01), Foster
patent: 3331091 (1962-07-01), Foster
patent: 3956790 (1976-05-01), Ishiwata et al.
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