Abrading – Machine – Sandblast
Patent
1994-12-07
1997-09-16
Rose, Robert A.
Abrading
Machine
Sandblast
451 89, B24C 304
Patent
active
056674317
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a dishwasher comprising a dishwashing tank with a compartment for receiving articles to be washed, and a magazine for receiving washing liquid and blasting agent, the washing liquid and the blasting agent having different densities; and a conduit which extends between said magazine and said compartment and in which a pump is connected for delivering washing liquid and blasting agent under elevated pressure to a nozzle arrangement mounted at the conduit end disposed in the compartment receiving the articles to be washed, washing liquid and blasting agent discharged from the nozzle arrangement impinging upon the articles to be washed, to subsequently drop into the magazine via an outlet from said compartment. The invention also concerns a blasting agent.
Heavy-duty dishwashers, primarily used in catering departments, are long since known, and are based on the idea of spraying under high presure a mixture of washing water and blasting agent towards the articles to be washed. The cleaning principle of the machine is as follows. First, the articles to be washed are fixed in a suitable device in the washing compartment. The washing process is begun by a pump pumping washing water with no blasting agent added. When the washing water has attained a suitable pressure and flow, blasting agent is added by the pump drawing a mixture of washing water and blasting agent from a magazine provided straight below the washing compartment. After washing, the pump draws only washing water for rinsing the washed articles, e.g. by sucking water from an elevated level in the tank, where the comparatively heavy blasting agent is not present. After rinsing with the washing water in the magazine, the articles are rinsed with fresh water to which a minor amount of a rinsing agent/drying agent has been added. When the whole washing operation is completed, the washing water is in most cases conducted to a strainer means for separating the blasting agent bodies from the washing water and collecting them in the lower part of the magazine to be used once more in the subsequent washing operation.
Prior-art heavy-duty dishwashers suffer from the drawback that the tank or magazine for receiving washing water and blasting agent from the dishwashing compartment is located straight below this compartment. This produces turbulence in the magazine, which in turn may cause the pump to draw air and thus make the dishwasher operate irregularly. Further, it is difficult to control the amount of blasting agent in the washing water pumped through the conduit to the nozzle arrangement in the dishwashing compartment. Neither is it possible to increase the amount or the degree of admixture of blasting agent while maintaining the capacity of the pump. Today's heavy-duty dishwashers have a tendency to attain only a 90% cleaning degree during the time at disposal. The normal washing time in a dishwashing programme is about 5 min. In order to obtain a 100% cleaning degree, that time would have to be prolonged to 15-20 min in prior-art dishwashers.
A primary object of the invention is to obviate the drawback of uneven operation, and an additional object is to increase the efficiency of the dishwasher.
These objects are achieved by a dishwasher which is of the type mentioned by way of introduction and which exhibits the features recited in the characterising clauses of appended claims 1 and 3.
Embodiments of the invention will be described in more detail below with reference to the accompanying drawings, in which
FIG. 1 schematically illustrates a first embodiment of the dishwasher according to the invention; and
FIGS. 2 and 3 show how blasting agent can be forced into the washing water conduit.
FIG. 1 schematically illustrates a first embodiment of the dishwasher according to the invention. The dishwasher has a dishwashing tank 1 with an upper compartment 10 for receiving articles to be washed 2, and a lower magazine 3, 4 for receiving washing liquid, normally water, and a blasting agent. A partition 12 divides the magazine int
REFERENCES:
patent: 1761492 (1930-06-01), Reily
patent: 2395160 (1946-02-01), Anderson
patent: 3012262 (1961-12-01), Mori
patent: 3323159 (1967-06-01), Ummel et al.
patent: 3455062 (1969-07-01), Eppler
patent: 3553895 (1971-01-01), Power
patent: 4374443 (1983-02-01), Mosell
patent: 4959930 (1990-10-01), Tsutsumi
Aktiebolaget Electrolux
Rose Robert A.
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