US 2789514 A
Description (OCR text may contain errors)
R. N. HILL April 23, 1957 PUMP 2 Sheets-Sheet 1 Filed March 13, 1953 f'7 INVENTOR'.'
ATTURNEX April 23, 1957 Filed March 15, 1953 R. N. HILL PUMP 2 Sheets-Sheet 2 Ill IHN NVENTOR @Md a,
United States Patent PUMP Richard N. Hill, Lakeland, Fla.
Application March 13, 1953, Serial No. 342,221
1 Claim. (Cl. 103-149) This invention relates to pumps. More particularly the invention relates to pumps of simple construction. Still more particularly it relates to pumps adapted to handle corrosive and erosive materials.
ln the pumping of liquids such as water the choice of a pump usually depends upon its efficiency, giving primary consideration to pressure conditions to be met on the intake and outlet sides of the moving element, which may be a piston or rotor, depending upon whether the pump is a reciprocating or centrifugal pump.
When the aqueous medium contains in solution corro` sive materials the problems of choosing a pump are multiplied. Materials of construction suiciently resistant to corrosion may present machining problems and in addition valves and stuing boxes require expensive special construction in order to prevent or minimize rapid deterioration.
v-If in addition to corrosion there is added the problem of erosion due to solids present in a corrosive liquid, the operating life of most pumping equipment is reduced to uneconomical lengths of time.
It is a primary object of this invention to provide a pump which overcomes the disadvantages and shortcomings of equipment heretofore in commercial use.
It is a further object of this invention to provide a pump which is of simple construction and comprises a minimum number of parts.
It is still another object of this invention to provide a pump which will operate against high back pressure.
It is still a further object of this invention to provide a pump which will operate on fluctuating feed Without danger of air locking.
It is still another object of this invention to provide a pump durable in use whether the feed is corrosive or not.
It is a still further object of this invention to provide a pump durable in use even when operating on corrosive and/or erosive slurries.
These and other objects of the invention will be apparent from the following description of one embodiment of the invention read in conjunction with the accompanying drawings in which:
Figure 1 is a side elevational view.
Figure 2 is a front elevational view along the line 2-2.
Figure 3 is a view in horizontal section taken along the line 3 3 of Figure 2.
Figure 4 is a side elevational view of the pressure exerting mechanism.
Figure 5 is a view along the line 5-5 of Figure 4.
As shown in the drawing, the structure comprises a casing formed of a body member 11 of cylindrical form. Body member 11 is secured to a base 12 by suitable means 13 such as angle arm support members welded at the extremities to body member 11. The angle arm support members 13, are secured to a base 12 by suitable means 14 such as bolts. To the front and rear faces of body member 11 are secured by suitable means 15 such as fixed or adjustable studs or bolts the Y, PaieniedrApr. 23, 1957` V, Iice retainer rings 16 and 17, which in combination with the body member form a recess. As shown in the drawings, vertically aligned units 15 are bolts, but the horizontally aligned units would be studs. If units 15 were positioned approximately 45 degrees displaced from the positions shown, all units 15 could be bolts.
On each side of the casing 10 are secured to base 12 positioned channel members 18 and 19. Mounted atop channels 18 and 19 are bearings 20 and 21 respectively adapted to receive and support a. shaft 22 which is inV line with the center of the cylindrical body member 11.
Shaft 22 is positioned against lateral movement by thrust collars 23 and 24 mounted on the outward side of the bearings 20 and 21. Shaft 22 is adapted at one end to receive a suitable coupling for transfer of rotary motion to the shaft from a power source not shown such as an electric motor either directly or through a suitable speed reduction mechanism.
A resilient tube 25 of circular, eliptical or other suitable cross sectional configuration and formed of rubber or` synthetic elastomers is positioned within body member 11 so as to be adjacent to and to press against the inner periphery of said body member in the race or recess formed by the body member 11 and rings 16 and 17.
Tube 25 crosses itself inside the casing and the tube ends 26 and 27 project to the outside of body member 11 through apertures 28 and 29 in a manner approaching the tangential position.
Shaft 22 is provided with a hub 30 which preferably is of a length slightly. less than the width of body member 11. Hub 30 is secured to shaft 22 for rotation therewith yby suitable means 31 such as a bolt, a threaded stud' or the like. Hub 30 is adapted at its extremities with arm members 32 and 33, preferably formed integral therewith. Arm members 32 and 33 are slotted as at 34 and 35 respectively. Arm members 32 and 33 support a shaft 36 which may be externally threaded and may be secured in place by engagement of washers 37 and 38 and nuts 39 and 40 against arm members 32 and 33 for operation at increased pump pressures. Both ends of shaft 36 are formed so as to have extending portions 41 and 41a projecting beyond the securing nuts 39 and 40.
Shaft 36 has mounted thereon as by a press fit a rotor hub member 42 held in fixed position betweenarm members 32 and 33 when nuts 39 and 40 are properly tensioned. Mounted on rotor hub member 42 are the inner races of ball bearing units 43 and 44. The outer races of units 43 and 44 are secured as by a press fit to a suitable roller 45 circular in shape and preferably constructed of metal. This roller is generally of a length slightly less than the axial width of the recess within the casing body and of a diameter preferably about one-half the radius of the casing.
Roller 45 is caused to exert compressing or collapsing pressure on the tube 2S by two flexible tensioning members 5l) secured in identical fashion between the shaft 22 and the extending portions 41 and 41a respectively of shaft 36. Flexible tensioning member 50 preferably consists of a spring 51 closed at the ends by washers 52 and 53 secured to the spring as by tack welding or formed with at ends for mounting against suitable supports. Washers 52 and 53 are provided with central apertures of a size adapted to receive a suitable securing element 54 such as a bolt. Shafts 22 and 36 are provided with aligned bores 55 and 56 respectively of a size adapted to receive said securing element 54.
Bolt 54 may be secured to shaft 22 in a suitablemanner permitting movement axially of the bolt as, for example, by a thrust arresting means such as, for example, nut 57 positioned on one side of the shaft 22. Bolt 54 is provided with an adjustable tension member support means such as nut 58. Bolt 54 further is of such length that the head thereof is not in direct contact with shaft 36. This spacing permits radial movement of shaft 36 as required. When spring 51 is mounted on bolt 54 between support nut 58 and shaft 36, the spring contacts with adjustable pressure the shaft 36 supporting roller 45 thus giving control over the pressure exerted by roller 45 against the tube 25.
4In operation of such a pump the quantity of liquid and/or slurry moved is controlled by the inlet pressure, often referred to as net positive suction head, the liquid head against which the pump is working, the pressure between roller 45 and tube 2S and the revolutions per minute made by roller 45.
Under such conditions as net positive suction head of one-half foot and the material to be moved being a slurry of about 30% solids content, a pump having a casing 14 inches in diameter with a 11/2 inch I. D. rubber vacuum tube looped in the casing which is contacted by a roller of 3 inch diameter exerting a pressure from a l inch coil When such pump is to be used as a vacuum pump springs 51 are tensioned by means of the spring supporting nuts 58 until such reduced pressure is maintained relatively constant as measured by a vacuum gauge mounted in the pump line,
A slurry pump comprising a casing with a recess therein, the peripheral wall of which is generally circular and said peripheral wall having spaced openings therein, a collapsible tube looped within said casing so that the iniet and outlet ends of the tube lie adjacent and parallel to one another at one point within said casing and adjacent said wall, a shaft extending through said casing and mounted for rotation about the axis of cylinder defined by said wall, a hub member mounted on said shaft oi' a width less than that of said recess and having a pair of parallel radially extending arms, radially extending aligned apertures in said radially extending arms, a roller supporting shaft supported by said arms and radially slidable in the apertures in said radially extending arms, a roller hub member mounted on said roller supporting shaft, ball bearing means mounted on said roller hub member, a circular roller mounted for rotation on said ball bearing means, aligned apertures in said shaft and said roller supporting shaft, spring securing elements mounted in said apertures, thrust arresting means mounted on said securing elements and in contact with said first-mentioned shaft, spring supporting means'mounted on said securing elements, and compressible springs positioned between said support means and the roller supporting shaft.
References Cited in the le of this patent UNITED STATES PATENTS 409,000 Allen Aug. 13, 1889 1,741,070 Olivcras Dec. 24, 1929 2,651,264 Bruckmann Sept. 8, 1953 FOREIGN PATENTS 193,574 Great Britain Mar. 1, 1923y