US2039815A - Rotary pump - Google Patents

Description

May 5, 1936. J. A. LUPFER 2,039,815

ROTARY PUMP Filed June 4, 1932 3 Sheets-Sheet 1 May 5, 1936.

J. A. LUPFER ROTARY PUMP Filed June 4, 1932 3 Sheets-Sheet 2 INVENTOR Patented May 5, 1936 UNITED STATES PATENT FFICE 9 Claims.

'I'his invention relates to rotary pumps and an object of the invention is to provide a relatively simple design of high pressure rotary pump which will deliver liquid at a relatively high pressure regardless of the quantity of liquid delivered by the pump, and one which will permit of a wide range of pressures and capacities in the same casing by modification of the rotor or impeller and the suction plates of the pump.

Another object of the invention is to provide a rotary pump as specified, which embodies radial suction and radial discharge in contradistinction to the usual axial suction and radial discharge of rotary pumps, and also to provide a pump which embodies a rotor or impeller constructed to insure maximum turbulence' in the pump chamber for any given impeller speed resulting in high discharge pressure or relatively great capacities.

A further object of the invention is the provision of a rotary pump which will operate without end thrust and its consequent disadvantages, and one in which the parts subject to the greatest wear are simple and inexpensive and may be replaced at little expense.

With these and other objects in view, as may appear from the accompanying specification, the invention consists of various features of construction and combination of parts, which will be first described in connection with the accompanying drawings, showing a rotary pump 'of the preferred form embodying the invention, and the features forming the invention will'be specifically pointed out in the claims.

In the drawings:

Fig. 1 is a view partly in plan and partly in section of the improved rotary pump and taken on the line I-I of Fig. 2.

Fig. 2 is a vertical section through the pump casing taken on the line 2-2 of Fig. 1 but having the impeller removed.

Fig. 3 is a section taken on the line 3--3 of Fig.

Fig. 4 is a section through the pump taken on the liney 4 2 of Fig. 1.

Fig. 5 is a'fragmentary plan of the outer circumference of the impeller on the plane indicated by the arrow A.

Fig. 6 is a plan of the inner circumference of the impeller taken on the plane of the arrow B and shown in Fig. 4, and

Fig. 'I is a view partly in section and partly in elevation of the velocity converting discharge block.- y

Referring more particularly to the drawings,

(ol. 10s-96) the improved rotary pump comprises a casing I which is split horizontally, providing the upper section 2 and the lower section 3. The sections 2 and 3 are detachably connected in any suitable manner such as by bolts 4 and may be disconnected for facilitating the mounting of the various internal parts of the pump in their proper positions and also to permit ready access to the interior of the pump for replacement of worn parts.

'Ihe casing I has suitable bearing structures 5 carried thereby which rotatably support the shaft 6 of the pump. The shaft 6 is packed against leakage by any approved type of suifing boxes as indicated at 1.

An impeller IIJ is mounted upon the shaft 6 for rotation therewith and is held against accidental longitudinal movement on the shaft by means of a nut I3 and an annular shoulder I2 formed on the shaft. The impeller I 0 includes the hub portion II and the radial disc I2 on which are formed the abutment ribs I4 and i5. The abutment ribs I4 are of substantially uniform thickness throughout their entire length and alternate with the abutment ribs I5 about the periphery of the impeller I0. The ribs I5 gradually decrease in thickness from their outermost edges to a .point substantially midway of the inner and outer ends of the abutment ribs I4, as clearly shown in Fig. 4 of the drawings, providing an appearanceto the inner periphery of the active portion of the impeller as is shown diagrammatically in Fig. 6 of the drawings, while the outer periphery of the impeller is as shown in Fig. 5 of the drawings, namely, comprising a plurality of spaced radial abutments which are separated one from the other by hollow, substantially semi-cylindrical chambers or pockets I1. 'I'he abutment ribs I4 and I5 extend into the annular turbulence chamber I8 of the pump. 'Ihe inner circumference of the turbulence chamber I8 is deined by the periphery of the annular flanges I9 formed upon the suction rings 20 and 2I. The suction rings 20 and 2| are mounted upon the hub II of the impeller III but are stationary, and they provide annular suctionpassages 22 and 23 within the pump casing I inwardly of the turbulence chamber I8 and also inwardly of the innermost ends of the abutment ribs I4. The fluid to be pumped enters the annular suction passages 22 and 23 through the suction inlet 24 and the branches 25 thereof. The iiuid to be pumped travels about through the annular suction passages 22 and 23 and leaves these passages through the suction ports 26 :formed in the suction rings 20 and 2| and opening into the active part 0 1' the impeller, namely, the portion carrying the abutment ribs I4 and I5 at the inner edges of the abutment ribs, causing the iluid to enter the impeller in a radial' direction as clearly shown in Fig. 3 of the drawings. If it is so desired, the disc I2 of the impeller may be cut away to provide curved surfaces 21 which conform to the curvature of the inner side walls 28 oi'the suction ports 26 Aformed in the suction rings 20 and 2|.

The fluid to be pumpedpasses radially through the impeller I0 between the abutment ribs I4 and I5 and is projected in a combined radial and centrifugal direction into the turbulence chamber I8, being carried abouty in the turbulence chamber by the abutment ribs I4 and I5 to the conversion block 30 which is placed in the turbulence chamber I8 adjacent the outlet or discharge 3| of the pump casing. 'I'he conversion block 30 lls the turbulence chamber I8 adjacent to the discharge 3| as clearly shown in Figs. 1, 2 and 3 ofthe drawings, and it has a Water receiving opening 32 therein which gradually decreases in cross sectional area from the entrance to the conversion block 30 to its outlet into the outlet 3l of the pump. The opening 32 gradually merges into an opening 34 which is of such size as to only permit the passage of the abutment vanes or ribs therethrough, and being tapered gradually, Without shock, collects the Water from the turbulence chamber I8, and merges in with the water between the ribs I4 and I5, conserving the energy' in the Water. This conversion block cooperating with the portion of the outlet 3| adjacent thereto, acts to convert some of the velocity of the water into pressure, thereby increasing the pressure of the uid at the discharge of the pump.

The annular suction rings 20 and 2l are provided With openings 35. therein which permit equalization of pressure on both sides of the disc I2 of the impeller I0 and facilitate the reduction of end thrust of the pump, which end thrust is further reduced and practically eliminated by the construction of the present rotary pump wherein the water or iiuid being pumped enters the impeller in a radial manner in contradistinction to the usual axial direction of flow of inlet fluid into ltion in the pump, and the provision of the conversion block 30 together witlL the `particular design of the impeller embodying the radially extending abutment ribs I4 and I5 and the concave spaces therebetween, will permit of the obtaining of relatively high pressures and relatively great discharge capacities for a rotary pump of any given size, and the particular design of the pump will also permit of a wide range of pressures and capacities in the pump by adjustment of the suction plates for varying the distance between the rports 26 therein and the conversion block 30. For example, the position of the suction rings' 20 and 2| and the location of the suction ports 26 therein with respect to the lconversion block 30, as shown in the drawings, will result in maximum pressure and capacity of the pump. By rotating or adjusting the suction rings 20 and 2I in such manner as to bring the suction ports 26 closer to the conversion Yblock 3U, the pressure and capacity of the pump may be reduced, for any given. speed of operation of the pump, proportionate to the relative distances between the ports 26 and the conversion block 3Il. Inversely, by increasing the distance between the ports 26 and the conversion block 30, the pressure and capacity of the pump may be proportionately increased.

The conversion block 30, which is the part of the pump subjected to the greatest Wear, may be easily and quickly removed for replacement and is in itself of inexpensive construction.

While in the drawings the turbulence chamber I8 is illustrated as with sharp or square corners, it is to be understood that it may assume any desired shape, without departing from the spirit of the present invention, and that consequently the abutment ribs may be shaped accordingly.

It Will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown, but that they maybe widely modified within the invention defined by the claims.

' What is claimed is:-

1. In a rotary pump, a casing having an inlet,

an outlet and' a turbulence chamber therein, said casing having an outlet passage leading tangentially from the turbulence chamber to said outlet, a rotary impeller in said casing including a disc-like body, radial abutment ribs on the sides of said body near its periphery and movable in said turbulence chamber, said turbulence chamber encompassing the sides and radial outer ends of said ribs, suction rings in said casing forming a suction chamber at each 'side of said body, said rings having circumferentially extending inclined ports therein opening into the turbulence chamber in a substantially radial direction at the inner ends of said abutment ribs.

2. In a rotary pump, a casing having an inlet, an outlet and a turbulence chamber therein, a rotary impeller in said casing,V suction rings adjustably mounted in said casing and forming annular suction passages, said rings provided with ports for directing incoming fluid from said suction passages radially into said impeller, a removable block in said turbulence chamber at said outlet and having a constricted passage therein, said suction rings being adjustable to permit variance of the distance between the ports therein and said block for varying the developed pressure and capacity of the'pump.

3. In a rotary pump, a casing having an inlet, an outlet and a turbulence chamber therein, a rotary impeller, suction rings in said casing forming annular suction passages on each side of said impeller, said suction rings provided with inclined ports arranged to directiiuid from said suction passages into the impeller in a radial direction, said suction rings being adjustable to permit variance of the distance between said inclined ports and said outlet for varying the developed pressure and capacity of the pump, said suction rings provided with openings to permit equalization of pressure on both sides of said impeller.

'4. In a rotary pump, a casing having an inlet, an outlet and a turbulence chamber therein, a rotary impeller, suction rings in said casing forming annular suction passages on each side of said impeller, said suction rings provided with inclined suction ports arranged to direct fluid from said suction passages into the impeller in a radial direction, said suction rings being adjustable to permit variance of the distance between said inclined suction ports and said outlet for varying the developed pressure' and capacity 'of `the 5. In a rotary pump, a casing having an inlet, an outlet and a turbulence chamber therein, a rotary impeller, and suction rings in said casing formingy annular suction passages on each side of said impeller, said suction rings provided with inclined suction openings arranged to direct fluid from said suction passages into the impeller in a radial direction, said impeller provided with a let, an inlet and aturbulence chamber in said casing,a rotary impeller, adjustable means in the casing provided with suction ports for directing incoming fluid radially into said impeller, said means being circumferentially adjustable for varying the circumferential distance between said suction ports and said outlet for varying the pressure and capacity of the pump.

7. In a rotary pump, a casing having an inlet, an outlet and a turbulence chamber therein, a rotary impeller, and suction rings in the casing provided with suction ports for directing uid radially intosaid impeller, said suction rings being circumferentially adjustable for varying the circumferential distance between said suction ports and said outlet for varying the developed pressure and capacity of the pump.

8. In a rotary pump, a casing having an inlet, an outlet and a turbulence chamber therein, a rotary impeller provided with a plurality of circumferentially spaced radial abutment ribs, certain alternate ones of said ribs being of uniform width throughout their length, the ribs adjacent said alternate ribs gradually decreasing in thickness from their outer ends inwardly and terminating in points outwardly of the inner ends of the alternate ribs.

9. In a rotary pump, a casing having an outlet, and an annular turbulence chamber therein,V

a rotaryimpeller, a plurality of circumferentiaily spaced radial abutment ribs upon said impeller, suction rings in said casing forming spacedv annular' suction passages on each side of said impeller and inwardly of said ribs, said casing provided with an inlet opening and a divided inlet passage, said divided inlet passage opening laterally into said annular suction passages, said suction rings provided with inclined inlet openings arranged to direct fluid from said suction passages into said ,impeller in a radial direction, said suction Arings being adjustable for varying thedistahce between said inclined inlet openings and said outletfor varying the capacity and developed pressure of the pump. Y

JAMES A. LUPFER.

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