US1864458A - Rotary pump - Google Patents

Description

T. W. NICHOLS ROTARY PUMP `lune 21, 1932.

Filed Nov. 15, 1931 2 Sheets-Sheet 2 0 mm MM, RE T wmm, mW/ V Y NME OR Hw IT Patented June 21, 1932 UNITED STATES i f f 1,864,458

THOMAS WINTER NICHOLS, 'OF "LONDON-ENGLAND :ROTARY PUMP" *i Application led November 13, 1931, Serial N'o.

This invention relates to improvements in rotary pumps.

In my United States Patent N o. 1,802,527 I have described an improved form of construction of a rotary pump of the type in which the rotor is in mesh with a revoluble ring of teeth there being interposed between the rotor and the ring a crescent shaped block, the features of the construction being that the rotor has paddle-like teeth formed on or attached to a web of a sleeve forming the hub of the rotor, fixed bearing bushes being arranged between the bottoms of these paddlelike teeth of the rotor and said sleeve, and the ring being formed of two similar sized annular members connected by bars which constitute the teeth of the ring meshing with the teeth of the rotor. The pump is provided with th-e usual inlet and outlet at the respective ends of the casing and if the pump is to be used for heavy oils an additional inlet may be provided in the form of a lateral inlet passing through the side walls of the casing and having openings adjacent the side of the rotor.

My present invention relates to improvements in pumps of the above described or similar type; and the object of my improvement is first to provide an improved arrangement of the inlet and outlet ports in order to allow the pump to be run at very high spe-eds without damage to the rotor by the presence of dirt or foreign matter in the substance being pumped, and second to provide means whereby a thin ilm of the water or other liquid being pumped is formed between the ring and the casing this lm operating as a cushion resisting any tendency of lateral movement or de-central rotation of the ring when revolving at high speeds thereby preventing scoring of the rotary parts by contact with the casing or crescent shaped block and consequent rapid wear thereof.

I attain these objects by the mechanism illustrated in the accompanying drawings in which Fig. 1 is a vertical longitudinal section of the improved pump, and

Fig. 2 a transverse section thereof on line 2 2 of Fig. 1.

574,882; an'a 'in Great' Britain october 24, 1930;'

Fig. 3 is V'a detail'view bein'gla sectionon' line 3-8 of Fig. Hooking-in-the-"direction of the arrow. A v

Figjll is a partialsection 'o'n-lineBA-BA of Fig. 2 and a full section onlineA-t oflFigfS, 55

looking in the direction of the arrow.r

Referring'to Fig. l1 in thepresen't-improved' construction the ring u' 'instead of being'directly open tolthem'ain inlet-of the pump) casing b as in the construction of my vsaid United 60 States patent isenclosedon'the inlet 'side by a continuation o of the top andfbottomcircularly curved casing 'wallsd within which the ring arotates so that -except for vthe ymain outlet f the ring is enclosed and'rotateswith- 66 in a cylindrical wall.`

yFrom the main inlet ba series of inlet channels g are formed in each side cover h 'ofthe casing and arebrought around so as to lead intothe interior of the pump 'on each side" of Zuv andl within the'ring', the inlet here being Ein" the form of one largeinlet port Z1 in the -lateral casingwall one von each side ofthe rotor and these inlet ports are extended along one side of each bush g1 by recessing saidfbushes.

lThese recesses j are 'formed in each fixed bearing vbush g1 for the rotorandpreferably to. an extent reaching tothe central lweb [c of the rotor as shown Vby dotted linesin Fig.

2 and in full lines in Figs. 3 and 4 so that' the 30 shown in Figs. 3 and 4. Between the rotor Z 85' and the ring a there is provided the crescent al which is stationary.

The main outlet f communicates with the periphery of the ring a and of the rotor Z 9 0 and in addition a port n is provided on each side of the main outlet these being connected by symmetrical channels nl in the side covers of the machine with the lateral faces of the bearing bushes these being recessed on each 0.6

side of the web of the rotor as at o so that each channel is in communication with the bottoms of the teeth m of the rotor on each side of and to preferably the full length of the bottoms of the teeth of the rotor on each 190 side of said web as shown in dotted lines in Fig. 2 and in full lines in Figs. 3 and 4.

To maintain a ilm of the liquid being pumped between the outer diameter of the ring and the casing, the front edge of each tooth of the ring is bevelled or radiused tangentially as at p, to allow the liquid to be forced over the teeth into small retaining grooves g, which preferably run the entire width of each tooth and partly into the annular members of the ring, as shown at fr-in Fig. 2. These grooves may be bevelled or Y radiused tangentially on the leading or both edges of the teeth. Also when liquids containing solid substances are to be pumped the web 7c at points between each of the teeth may be bevelled onl each side as indicated in Fig. 1 at s.

It is to be remarked that with theV internal ports arranged as hereinbefore described the ring is automatically balanced against delivery pressure which allows the pump to be run at very high speeds without undue wear and further the provision of the recesses ando in the bearing bushes allows any particles of hard foreign matter in the liquid being pumped to pass through the pump without injuring or clogging the same.

The pump can be arranged zontally or vertically. A

What I claim as my invention and desire to secure by Letters Patent of the United States is l. In a rotary pump of the character described the combination of a shaft,a rotor on said shaft having a hub, a web and teeth carried by said web, a casing having inlet and outlet ports facing said rotor in the axial direction of the pump, a ring cooperating with said rotor, a crescent between the rotor and the ring, and fixed bearing bushes for said shaft having flanges engaging between said hub and said teeth and having arcuate recesses at their rims facing said inlet and outlet ports. Y

2. A. rotor according to claim l, wherein the arcuateprecesses extend into said bushes up to the hub of the rotor.

' THOMAS WINTER NICHOLS.

to work hori-

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