Blowing nozzle for silent outflow of gas
First Claim
1. A nozzle for a blowing device comprising:
- an inner hollow cylindrical member;
an outer hollow cylindrical member at least partly surrounding said inner cylindrical member to form a nozzle at one end of said cylindrical members;
an open supply channel between said cylindrical members having an outlet with inner and outer circumferences at said nozzle end for compressed air supplied to said channel to produce a jet of air in the form of at least a part of a ring under adiabatic expansion;
a source of compressed air connectable to said supply channel;
at least one communication channel in said inner hollow cylindrical member having two ends open to the atmosphere, one of said ends comprising an outlet substantially concentrically surrounded by said supply channel outlet and operatively associated therewith to connect the inside of said jet with the atmosphere; and
the product of the ratio of the sum of the inner and outer circumferences of said supply channel outlet to the cross-sectional area of said supply channel area and the ratio of the inner diameter to the width of said supply channel outlet being larger than 4 mm/mm2.
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Accused Products
Abstract
A blowing device for compressed air or the like comprising at least one supply channel (15) which is connectable to a source of compressed air and outlet (19) which is shaped to impart to the compressed air a jet in the form of a ring or part of a ring, and at least one communication channel (20) adapted to connect the inside of the jet with the atmosphere. The object of the invention is to provide a blow nozzle with a large contact surface between outflowing pressurized air and the ambient air in order to provide an airflow with a low sound level, a large momentum, high efficiency and reduce striking velocity against the object intended to be cooled, dried or blown clean. This has been attained in that the product of the ratio between the outer plus the inner circumference (O2 and O1) of the outlet (19) and its area (Aout) and, on the other hand the inner diameter (D) of the outlet and its width (S), is at least 4 mm/mm2, preferably considerably larger than 4 mm/mm2.
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Citations
18 Claims
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1. A nozzle for a blowing device comprising:
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an inner hollow cylindrical member; an outer hollow cylindrical member at least partly surrounding said inner cylindrical member to form a nozzle at one end of said cylindrical members; an open supply channel between said cylindrical members having an outlet with inner and outer circumferences at said nozzle end for compressed air supplied to said channel to produce a jet of air in the form of at least a part of a ring under adiabatic expansion; a source of compressed air connectable to said supply channel; at least one communication channel in said inner hollow cylindrical member having two ends open to the atmosphere, one of said ends comprising an outlet substantially concentrically surrounded by said supply channel outlet and operatively associated therewith to connect the inside of said jet with the atmosphere; and the product of the ratio of the sum of the inner and outer circumferences of said supply channel outlet to the cross-sectional area of said supply channel area and the ratio of the inner diameter to the width of said supply channel outlet being larger than 4 mm/mm2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification