US987995A - Centrifugal pump. - Google Patents

Description

4o 7 1g. 2-is a similar v1 -'struction. Referring first to"'Fig'.

. To alt 'whom'et may concern:

UNITED s'rarns -PA'TETENT @FFIQ i3.

HULDREICH KELL'nnor rennin, GERMANY, ASSIGNOR TO GENERAL ELECTRIC 'COMPANY,'A-CQBPORATION or NEW Your:

- spcmcatim I'tter's t Patented Mar. 28. 191i. 1 hppiicatioii 'fii'e'a Octolier 9,

1510s. Serial no. 456,980.

' .Be it known that I, net ieii mmk, a citizen of Switzerland, 'resid ng' useful Improvements CentrifugalPunips, of which the followingis a specification. Y

throw out through a'rapidlyrevolying circular runner and delivered to; tionarydiifuseror conducting ringfj" The"centrifugalaction is jiiitensified by admitting a liquid theair or gas to. be pumped 'is'eiitrainedbe tween pellet-s or pistons ofwater and car ried forcibly oiit through the impelleraiid' diffuser. In a p nup of this type it is well known that. the 'compressin jaction 'is .in'-

creased by decreasing the size of-the'oonduits outwardly as they pass through the difi'user or conducting ring. If this'constrictionextends throughout the'entire conduit, the particles in a piston of the driving medium must 1" constantly changing position as it .moves along the conduit. This shifting ofeourse entails great friction losses in said piston, and theenergy formed into friction is lost. The object of the present invention is to reduce as -much' as possible'the aforesaid shifting of the particles and the consequent friction losses, by confining the constriction of theconduits to their initial portions, leavg them to continue thereafterat a'consta'nt size.

In the accompanying drawing, Figure 1 is a longitudinal section of. a portion of a conducting ringembodying my, invention; andthus trans- 1, the conduits "1 which are found in the conducting ring 2 fona portion of their length. Calculation and eiiperiment demonstrate that the most favorable point for the minimum constriction is' about midway of the length of the conduit, as at 4. From thereon to the exits 5 the conduits preserve a substantially uni- ,form cross section, being preferably straight,

as shown. In these' conduits the water pistons 6 grow 'eontinuously'smaller in cross ,liB-fifliM-L- German Y have invcnte'dfcerta n' newand on? of a modified 'conare constricted or tapered from their en-- ,trances 3 .on the inside of the ring outwardly section and greater in length as they move froznihe entrance'3 to the point of greatest 'c ':nstriction, the spaces between them becoming smaller. The gas pistons 7 confined between the water pistons decrease in volume, because not only'their cross section but their axial length eon U ntly grows less. In progressing"alongtne fiiniform portion of the conduit to its exit fig-the-water pistons do not change inshape,""sofithat there is no shifting. -of their particle's andfriction losses are rednced. The pistons approach nearer together, however, by reason of the gradual maintain the? section, but decrease in al that a high degree of compres. m "'is at'taIned at the exit 5.

In Fig. 1 the constriction, of the conduit begins'at the entrance, so that the quantity of air-entrained between successive water pistons is not so great as if the conduit were const'antin section'orwere even increased. In Fig. 2 is shown a constriction by means of which larger increments of air can be obtained. Here the side walls 8' of the conduit diverge from the entrance 3. The successive water pistons 6 inclose alarger volumeof air than would be the case if the sides of the conduit were to approach each other from the entrance onward; for example, likethedotted lines 9. In order to secure the proper. compression of these in the conduit, dividing its outer portion into two sub-conduits, 11 11. T e tongue tapers to an edge 12 at its inner end, and the ,adjacent surfaces 13 rapidly approach the side walls 8- of the main conduit until at fthe point 14a suitable narrow cross section is obtained. From this point. to thei'r exits the sub-conduits preserve substantially the same cross section. It will be observed that each sub-conduit in Fig. 2 is substantially the same as the single conduits shown in Fig. 1, so that Fig. 2 may be said to show main conduits leading to two single or constricted conduits.

patent statutes, 1 have described the principle of operation of my invention, together with theapparatus whiehl now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

reduction of their velocity. The gas pistons l larger volumes of air, a tongue 10 is inserted In accordance with the provisions of the What I claim as newand desire to secure by Letters Patentof the United States, is,

1. In a centrifugal pump in which gases are compr ssed by a specifically heavier driving medium, a conducting ring provided with conduits which are tapered from their entrances for a. portion of their length only,

and are substantially straight for the re mainder of theirlength.

2, Ina centrifugal pump in whlch gases are compressed by a specifically heavier driving-medium,a conducting ring provided with conduits whosecross'section diminishes ata certain distance from v the entrance .and' thereafter remains substantially constant to' 1tl1e ex it. I

3. In a'pentrifugal pump inwhich gases are compressed by a specifically; heavier driv ng medium, .av conducting ring provided with conduits whose outer portions are of substantially constant cross section, but

"whose. innerrport-ions'are larger.

4:. In a centrifugal pump in which gases are compressed by a specifically heavier driving medium, a conducting ring provided with conduits whose cross sect-ion diminishes from the entrancefor a certain distance and my hand this l5thday of-September, 1908.

- Y' I-IULDREICH KELLER. Witnes'ses:i

' HANsREINEIKE, 'MARTIN KREMP.

Copies of tliis'patentnrajhe obtained-for five cents ,each, by addressing the Commissioner of Patents,-

Washington, D. 02

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