US1902728A

US1902728A - Conveying liquids at high pressure by means of ejectors

Info

Publication number: US1902728A
Application number: US475303A
Authority: US
Inventors: Schmidt Paul
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-08-21
Filing date: 1930-08-14
Publication date: 1933-03-21
Anticipated expiration: 1950-03-21

Description

March 21, 1933. w P. SCHMIDT 3 CONVEYING LIQUIDS AT HIGH FRESSURE BY MEANS OF EJECTORS Filed Aug. 14, 1930 Patented Mar. 21; 1933 UNITED STATES PATENT OFFICE PAUL SCHMIDT, OF MUNICH, GERMANY CONVEYING LIQUIDS AT HIGH PRESSURE BY MEANS EJ'ECTORS Application filed August 14, 1930, Serial No. 475,303, and in Germany August 21,1929.

Ejectors are, in general, only used for the production of reduced pressures, for example, for the draining oftrenches or cellars, for the emptying of vessels and the like, using water under pressure, is taken from the water mains. The height of delivery, in such cases amounts only to a few metres, whereas the driving pressure of the pressure liquid amounts to several atmospheres.

Experimental investigation of the pressures set up by ejector pumps for the pro duction of high pressures it has now been found that hydraulic advantages can be obtained by dividing the driving fluid up into separate streams and delivering these streams in succession to the flowing liquidto be delivered. The value from the hydraulic and commercial standpoints of theimprovement obtained becomes more particularly manifest when the drivin pressure of the pressure liquid amounts on y to a fractional part of the total height to which the liquid to be delivered israised. By driving pressure as that term is used in connection with the present in-' vention, is meant the working pressure, or head that is to say, the difference of pressure between the inlet and outlet of the pressure liquid to and from the machine.

The invention, therefore, relates to the delivery of a liquid at high pressure by means of ejectors and its subject matter consists in subdividing the driving liquid into separate streams and delivering these streams 1n succession to the flowing liquid to be delivered.

For low delivery heights the use of an ejector according to the present invention is less advantageous, because when the driving liquid is supplied in the manner according to the present invention the cost of working the pump is considerably increased At low heights of delivery the amount of work to be done is, however, too small in relation to the 'cost of the hydraulic improvement to be made to pay. The circumstances are different when greater delivery heights, amounting, for instance to several hundreds of metres, are required, because, in this case, the degree of efficiency of the pump assumes far greater importance. When delivery heights of about one thousand metres and more are involved the pump efficiency exerts an absolutely decisive influence.

Within the sphere of usefulness of the ejector pump according to the present invention there comes, for example, the feeding of high pressure vessels with a pasty mixture of finegrained contact substance and heavy oil for the synthetic production of benzine. For this purpose the ejector is driven withpreheated oil under pressure, which oil is to be subjected to hydrogenation. In the vmore recent processes in the chemical industry which are worked at high pressures and in most cases with a pulverulent contact substance, there are other spheres of usefulness which are substantially similar to those for the production of light oil. A particularly wide range of application of the process according to this invention is, however, the raising of oil from very deep bore holes. When the invention is used for this purpose it is advantageous to arrange the supply of the driving liquid to accord with to the extension of the pipe. 7

An ejector apparatus suitable for this purpose is diagrammatically shown in the drawing in section along the longitudinal axis.

This apparatus comprises a pipe 1 for the pressure liquid and a pipe 2 for the liquid to be raised. The mixture of the pressure liquid under which the liquid to be raised is effected b means of

ejector nozzles

3, 4, 5, 6, 7 and 8. T e part of the apparatus worked by the

nozzles

7 and 8 has a particularly advantageous action, because a retardation of the flow of the liquid through the apparatus is obtained in front of each of these nozzles by an enlarged part of the pipe 2 and consequently an increase of'pressure is produced. This increase of pressure may be obtained with' a suitably modified construction, for example, by an eddy flow (c wr=a constant) of the liquid. This advantageous gain in pressure by the retardation of the flow of the liquid may obviously be extended to. the whole of the ejector apparatus with the exception of the part in front of the first nozzle 3. In addition to this the several pressure nozzles may be arranged at any desired? distance apart determined as suitable by the local conditions. WVhen the apparatus is built into a bore hole the advantage secured thereby is that only a fractional part of the driving liquid needs to be taken down to the lowest point of the conveying pipe, the remaining portion being tapped oll' at. lesser depths from the pressure pipe. This arrangen'ieut of the ejector nozzles distributed over the whole depth of the bore hole naturally results in a reduction of the necessary cross sections and an economy in pipe losses.

\Vhat I claim is 1. The method of creating a high liquid pressure in a conduit which comprises admitting a liquid under low pressure into the conduit, and successively imparting to it, during its passage through the conduit. increments of pressure totaling the dill'erential between said high and low pressures by impulses from individual jets from a single column of a liquid under a pressure less than the said high pressure to be created.

2. The method of creating a high liquid pressure in a conduit which. comprises admitting a liquid under low pressure into' the cond' t, and successively imparting to it, during its passage through the conduit, impulses from individual jets of a pressure liquid which is under a pressure such that the difference of pressure between the inlet and outlet of the pressure liquid to and from the conduit is less than the high pressure to be created.

In testimony whereof, I have alfixed my signature.

PAUL SCHMIDT.