US950563A - Screw-pump. - Google Patents

Description

E. S. BENNETT.

SCREW PUMP.

APPLIOATION FILED APB.B, 190s. RENEWED SEPT. 14, 1909.

Patented Mar. 1,1910.

' 2 SHEETS-SHEET 1.

E. S. BENNETT.

SCREW PUMP. APPLICATION FILED APR.8, 190s. RENEWED SEPT. 14; 1909.

950.563. Patented Mar.1,1910.

2 SHEETS-SHEET 2.

UNI ED STATE8 PATENT oE IoE.

ERASTUS s. BENNETT, OF NEW YORK, N. Y., ASSIGNOR 'ro CONTINENTAL ENGI EERING ooMPANY, 0F NEW YORK/N. Y.

I SCREW-PUMP.

Application filed April 6, 1908, Serial No. 425,502. Renewed Septembenfl, 1909. Serial/F0. 517,747.

To all whomit may concern:

Be it known that I, Ems'ros S. BENNE'rr, citizen of the United States, residing at New York, N. Y., have invented certain new and useful Improvements in Screw-Pumps, of which the following is a specification.

My invention relates toscrew pumps, and the object/thereof is to secure an effective and durable pump and one which may be constructed at low cost.

The invention consists in the features 0 construction andcombination and arrangement of parts hereinafter described and particularly pointed out in the claims.

The invention is illustrated in the accompanying drawings, in which Figure-l is a. longitudinal sectional view on line A-'-A of Fig. 2; Fig. 2 is a section on line B-B of Fig. 1: Fig. 3 is a section on line CC of Fig. 4:; Fig. 4 is a face view of one of the heads removed; and Fig. 5 is a face view of one of the double conduits comniunicating with the heads.

In these drawings 1 is the cylinder of the pump provided with the heads 2 and 3, and 4 is the double threaded screw the shaft of which passes through stufling boxes 5 in the heads. 6 are the bearings for the said shaft.

As will be seen the screw is double threaded and of uniform pitch, and this provides two intaking cutters and two discharging blades. The heads of the cylinder are duplicates of each other, one being used as an inlet and the other'as an outlet. Each head is provided with two openings 7 and 8 each in the form of an arc of a circle, the outer diameter being substantially that of the inner diameter of the cylinder. Attached toeach 'head is a pipe 9 which has an interior web 10 therein which divides said pipe into two conduits. Said pipes communicate with the openings in each head and are adapted to receive the induction and discharge pipes respectively.

It is thought the operation of the device will be clear from the above. The water enters one of the pipes 9, flows through the are shaped openings 7 and S in one head anderating at precisely opposite sides, as do also the two discharging ends. The uniform pitch of the screw prevents loss of. power due to varying pitch or pitches in the same pump. Of course the volume of water dis: charged can be varied by changing the pitch of the screw, the larger volume being obtained by greater pitch (within certain limits) of the screw. The force or head a ainst which the pump will dischar e can a so be governed by the pitch of t e screw, the greater force being obtained by the lesser pitch (also within limits). Additional force is also imparted by increasing the speed of the screw, since the water in each thread space acts as a packing-and obstruction to back pressure.

Bythis construction I am able to secure a close cut off (without actual contact of metal) at either end. The stufling boxes are easy to get at, the journals are well outside and away flOlnllle water. The screw need not fit closely in the cylinder, that is to say no actual contact of .moving parts is necessary except that of the shaft in its bearings.

In" construction very little machine work is required, the weight and size of the pump is exceeding small as compared to the volume of water handled and for these reasons an exceedingly low cost and obviously very durable pump is'pr'oduced. None of the force is wasted either by friction of metal, movement of numerous parts, or through the con? version of the power into centrifugal force to be largely lost in packing a large body'of water against the inside of a comparatively large circular case as in centrifugal pumps. In this case the power is applied directly to the'water, and :is exerted to push it forward in the direction intended. or directlytc the discharge. Hence, a given body of water can be moved by this pump with much less power than the same can be moved with any of the pumps in ordinary use.

It will be noted thatthe screw is of the full length of the c sing and acts on what may be termed for convenience a plug ofwatt-r extending from head to head of said casing. The end of the screw at the inlet end has a shearing or positive cut off action in connection with the surface of the head cutting off successively bodies of the water Patented Mar. 1, 1910.

from the inletin the successive revolutions only in connection with a double screw but they serve to prevent whirling or eddy currents of the water at the inlets and outlets.

I claim as my invention 1. A pump comprising a cylinder having each head provided with two arc-shaped .openings, and a central opening, a double openings and a central opening, a doublethreaded screw in said cylinder having both ends of eacli thread working closely against said arc-shaped openings, a shaft for the screw passing through the central openings in the heads, and an inlet and discharge pipe communicating with the openings in the said heads, each pipe having a central web therein dividin the pipe into two conduits, one of the bla es of said screw being displaced in relation to the other blade.

3. A pump comprising a cylinder having openings in one and a rality of outlet openings in the other, a-screw within the cylnider. having a lurality of threads displaced circumferentially in respect to ea h other, one thread acting in connection with one inlet and outlet while simultaneously the other thread acts in connection with the other inlet and outlet, the ends of the screw threads working close against the saidheads, substantially as described.

4. In combination in a pump a casing having a head at each end with a plurality of openings leading through the same, ashaft, a double screw in the casing on the shaft and supply and delivery pipes having division walls therein forming spaces communicating each with one of the openings in the heads, said supply and delivery pipes being counterparts of each other and each having an external. bearing for the shaft of the screw,

substantially as described.

In testimony whereot, I atiix my signaturein presence of two witnesses.

ERASTUS S. BENNETIT.

Witnesses:

Mrn'on L. JUSTIN, Cun'rox l). GANSE.

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