US1155735A - Nozzle. - Google Patents

Description

E. J OSSE & W. GENSECKE.

NOZZLE. APPLICATWN FILED DEC. 19. 19:3.

Patented Oct. 1915.

WIT/716355 4 mg;

EMIL JOSSE AND WILHELM GENSECKE. OF CHARLOTTENBURG. GERMANY.

NOZZLE.

Specification. of Letters Patent.

uncalled Oct. 5. 1 M 5.

Application filed December 19, 1913. Serial No. 807.783.

To a whom it may concern:

' lie it known thutwe, Esmulossr. and WIL- HnL'n (iEXSEfKE, both subjects of the Eniperor of Germany, and residents of (harlot tenburg. (lei-many, have invented certain new and useful Improvements in Nozzles, of which the following is a specification.

Our invention relates to in'iproveinenis in nozzles for instance of the type used in so called jet coin ressors or appamtusv Such apparatus as is Well known commonly consist of a nozzle in which the energy is convertcd from potential into kinetic energy, a mixing chamber in which driving medium is mixed With she driven medium. and a diffuser in which the energy is converted back from kinetic to potential energy. The present invention is particularly designed for jetcompressors in which a suction takes place from a chamber in which a high vacuum exists and in which the driven medium, in consequence, travels at a speed far beyond that which roaring or other sound is produced and known as the critical speed. in apparatus of this kind it is necessary, in order to secure a maniinumly effective operation, that the current or flow of the dris ing medium be free from distur ances. It is Well known that the possibility of the formation of sound Wavesv or condensation shocks exists when the above mentioned critical speed is exceeded, which disturbances when present seriously interfere with the operation of energy conversion. Such disturbances appear particularly at that point where the mixture of the driving melium and-tho driven medium takes place.

The present invention has for its object to obviate these objections and to this end provides a means for imparting a rotary motion lo the vapor which expands in the nozzle, after said vapor has reached a spec" which is greater than the above mentioned critical speed. By this means a disturbance of the flow through the formation of sound waves or shocks is eliminated or reduced to a minimum. In existing types of jet compressors these disturbances are materially present and in the main account for the low efiiciency of operation of such apparatus. The effect of the presentarrangement that without perceptible increase of Eriction in the nozzle, the expansion can be carried to an extraordinary low point and the suction and driving capacity very considei-- ably increased. 'It is essential. that the 11 ing of the, current from the walls during the passage from the converging to the divergmg part of the diffuser can easily occur. In consequence of this a formation ofeddies occurs which reduces the operative efiiciency of the apparatus. The centrifugal force generated through the above mentioned rotation prevents in an effective manner such. a dot-aching of the currents.

Reference is to be had to the accompany drawing in. Which liigure l is a diagrammatic sectional representation of an example of our improvement and Fig.2 is a diagrammatic and View thereof. I

in the said illustration a is the nozzle in which the expansionof gases or vapor takes place and which has it smallest cross-section E), from Whi ch. point said nozzle gradually increases in cross-sectional areav in the same ratio in which expansion takes place; According to the present invention blades or ribs (Z spirally arranged about the axis of the nozzle are located in the comically enlarged portions thereof and extend from approximately the point 0 of said nozzle toward the outlet end and may consist of a separate unit or body adapted to be inserted into said nozzle or be. simply formed integrally therewith. The reference character c indicates approximately the point at which the current exceeds the critical speed and at which rotation by. means of the blades or ribs Z may begin, The said blades or ribs d in whatever form may extend up to the outlet end of the nozzle as in the illustration but this is not, absolutely essential and is only an example. i r

The invention is also capable of being used in other structures in which the n0z-' zle is employed for changingpotential ener v to kinetic chore such as steam tur hines, tin-Lune mower is adapted to more. oration Various inmiifienkimis in .1 form. shown and described may he mnCe 'nJ'hv the scope of the claims without departing ..1:o1n the spirit of ulll invention.

1, The combination oih i1 nozzle or the like, and means Within. sun nozzie for importing a rotation to the oln-ieni; passin therethrough, said. means extending from a point located at a distance inw: diy' from. the inlet end of said nozzie towel-l the outlet thereof and beginning e'nbi itinily at the point oi; which ihe orig [i L JQECi of the current is exceeded in said. 'iioziaio.

The eolnbinneioin of steznn nomie or 0th., one. in :\ii CHSGS we the eflieieney oi op the like having an interior diameter increasmg io'wz'u'iji outlet end, and rlbs located within said nozzle and extending spirally of said current is exceeded therein.

in testimony whereof, We have hereunto our hands in the presence of two subscribing WiEHQE-LSQS- V EMIL JOSSE.

W ILHELM GENSECKE. i i 'iiznessee 'WoLm-mmn lihaor'r, '2. 1mm? Human.

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