Air-blasting cartridge

Details Air-blasting cartridge Air-blasting cartridge

1989-02-22

1990-10-30

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

With means causing intermittent interruption of supply to...

239DIG13, 239570, 13762414, 137906, G05B 108

Patent

active

049663267

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates generally to water supply and water disposal practice and more specifically to air-blasting cartridges.
One prior-art air-blasting cartridge (SU, A, 130, 454) is known to comprise a housing subdivided into an inlet chamber and a discharge chamber by a piston arranged along the longitudinal axis of the housing. The inlet chamber communicates with a source of compressed air through an air admission tube which passes through an axial port in the piston. The discharge chamber communicates with the inlet chamber through an annular gap left in between the air admission tube and the piston. In addition, the discharge chamber gets connected with the surrounding atmosphere at the instant when it is being discharged.
Compressed air from its source is fed along the air admission tube to the inlet chamber to establish a pressure applied to the piston end adjacent to said chamber, thus forcing the piston against the seat. Compressed air is free to flow to the discharge chamber through the annular gap between the air admission tube and the piston. To actuate the known air-blasting chamber a valve is provided through which an air duct communicating with the air admission pipe can be connected to the atmosphere.
Once the operator has established communicaton between the air duct and the atmosphere, compressed air is free to escape from the air duct, air admission tube and inlet chamber into the atmosphere. As a result, pressure in the inlet chamber falls and the piston is urged, by virtue of the pressure exerted on the hand surface on the part of the discharge chamber, to move towards the inlet chamber, thus opening through-ports in the housing of the air-blasting cartridge for compressed air to release into the atmosphere.
The heretofore-known air-blasting cartridge discussed above is designed for destructing hard coal but is inapplicable for cleaning industrial pipelines or vessels containers from consolidated settlings or cake due to the following reasons:
provision of a valve (discharge head) makes it impossible to maintain automatically a preset operating mode of the air-blasting cartridge within a prolonged period of time;
the valve (discharge head) designed for a high pressure, is in fact a complicated contrivance incapable of providing the necessary reliability of the air-blasting cartridge within a prolonged continuous operating period (that is, it suffices to carry out rock or coal break-down by air blasting only once;
considerable length of the air duct running from the air-blasting cartridge to the valve-attending operator causes considerable loss of compressed air escaping into the atmosphere and affects adversely the piston traversing speed in the air-blasting cartridge due to a comparatively slow pressure drop in the inlet chamber, which is in turn owing to a great total amount of compressed air in the air duct, air admission tub and inlet chamber, thus reducing much the air-blast power.


SUMMARY OF THE INVENTION

The main object of the present invention is to provide a cartridge having such a construction of a piston that would provide automatic maintaining of preset operating conditions and possibility of adjusting operating conditions without interrupting the operation of the air-blasting cartridge, a possibility of the air-blasting cartridge operation in liquid media supersaturated with solid suspensions, operating reliability and simple construction and also considerable reduction of power consumption of the air-blasting cartridge.
This object is accomplished due to the fact in an air-blasting cartridge, comprising a housing subdivided, by virtue of a piston arranged lengthwise a longitudinal axis thereof, into an inlet chamber communicating with a source of compressed air through an air admission tube which runs through an axial port of the piston, and a discharge chamber communicating with the inlet chamber through an annular gap between the air admission tube and the piston and adapted to communicate with the surrounding atmosphere at the instant of it

REFERENCES:
patent: 3536263 (1970-10-01), Parker
patent: 3618857 (1971-11-01), Rautenbach
patent: 3814330 (1974-06-01), Masters

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