US 665145 A
Description (OCR text may contain errors)
lPatented Jan. l, |90I.'fY
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JOHN STUMPF, OF BERLIN, GERMANY.
SPECIFICATION forming' part of Letters Patent No. 665,145, dated January 1, 1901.
Application tiled July 9, 1900. Serial No. 22,914. lNo modela To @ZZ whom t may concern/.-
Be it known that I, JOHN STUMPF, a subject of the Emperor of Germany, residing at Berlin, Germany, have invented a new and useful Improvement in Pumps, of which the following is a specification.
My object is to provide certain improvements in the construction of the pulsationchamber portion, more especially of hydraulic pumps, as well as in t'he'arrangement of the valves, with a view to the production of a particularly simple, strong, durable, and compact construction possessing advantages over pumps of similar type as hitherto provided in the smoothness of operation, ease of repair, and other features.
In the drawings, Figure l is a broken and longitudinal section of the pulsation-chamber portion of the pump provided with my improvemen ts, and Fig. 2 a broken cross-section taken on line i of Fig. 1 and viewed in the direction of the arrow. g
A is the pump-casing, formed at its outer end with an opening a, fitted with a'removable head a.
B is the pump piston or plunger.
Forming an integral part of the casi ng is an annular rib b, presenting an annular shoulder b'. The piston works in a guide-cylinder C, which at its rear end fits an opening c in the casing A. On the forward end of the guidecylinder is a ring C', carried by a spider, be-
tween the arms of which are the openingsd,
forming the passage or port from the suctionchamber D to the pulsation-chamber E.
F is a pulsation-chamber casing, preferably inthe form of a hollow conic frusturn,rabbetedV at its inner end to fit a corresponding rabbet in the edge of the ring O'. The outer end of the pulsation-chamber casing is a grid or valve-seat F', consisting of a central boss e, rings e', and radial ribs e, forming between them a series of outlets or ports e3. The circumferential edge of the grid portion of the casing F is beveled off or provided with beveled sockets e4, and passing through the casing A are pins f, having beveled end portions which as the pins are tightened in place bear against the beveled portions e4 of the pressure-chamber casing to tighten it in place against the ring C'.
a' and surrounding the frusto-conical casing a F. On the chamber G is a discharge ai r-chamber G', and extending from one side of the l chamber is the discharge opening or port G2. The annular space about the guide-cylinder C is the suction-chamber D, surmouuted by a suction'air-chamber D' and having the inlet D2. A suction-valve seat H is formed of concentric rings h h'. The ring h is fastened in a recess in the ring C', and the ring h' is fastened in a recess in the end of the guidecylinder C. c
H" is the suction-valve in the form of a ring, adapted to closely fit the valve-seat H and close the passage or port d.
Integral with the ring C' is a series of longitudinally-extending ribs g,formng guides for the valve H', and coincident with the ribs g are ribs or projections g',.integral withthe pulsation-chamber casing F and forming stops to limit the distance of opening or lift of the valve H'. l
In the chamber G is a valve-holder I, cornprising a central sleeve z', radial ribs 1T', and a series of annular concentric sockets i2. The valve-holder is mounted upon a bolt I', which at its inner end is screwed into the boss e and at its outer end passes through an opening in the center of the head a'. The sleeve portion c' is between a stop t3 and collare4 on the bolt. In theA sockets i2 are annular rubber springs K, itting at their ends over pressure-valve rings K', which close against the seat F', over the openings es. In the guide-cylinder C are the bushings lo, in which the piston slides.
In operation in the outward movement of the piston or plunger B the suction-valve H' is openedand water is drawn from the suction-chamber D int'o the pulsation-chamber E. In the inward movement of the plunger the valve or Valves K' are opened by the pressure and the water is discharged into the pressure or force chamber G and out at G2. The
one, for the reason that it involves comparatively few parts and permits their ready re moval and replacement. Furthermore, it is attended with peculiar advantages both in the saving of material and economy of operation, as hereinafter explained. place the piston, suction-valve, and pressurevalve are coaxial,which arrangement makes it possible to render the construction particularly compact with large ports and to reduce the suction-lift to a minimum.
In the first In the second place by providing the pressure or force chamber about the chamber E pulsationsthat is to say, expansion and contractionof the pump-casing are avoided. In operation with each instrolre and outstroke ofthe piston v the wall ofthe pulsation-cham ber is subjected 4 alternately to internal pressure and relative vacuum. application of pressure, owing to the natural though limited elasticity of iron or steel, is to cause the casing or cylinder F to pulsate. Obviously unless means are provided for re- The tendency of this intermittent ducing the pulsations or stopping them altogether they are apt in time to effect such i weakening of the casing as to result in fracl tures. Furthermore, with each pulsation there may be such a variation in the cubic contents of the chamber as materially to retard the action of the valves, particularly in i the case ofan express or high-speed pump. I
Hitherto it has been usual in order to avoid the pulsations to provide the chamber-casing A of a thickness and 'with suitably-disposed re inforcements which would enable it to with-l stand without expansion the greatest pressure to which it may in use be subjected. In
my improved construction the pressure or force chamber and outer surface of the casing F are subject at all times during operation to the steady pressure of the water column on the discharge side of the pump, and in each dischargestroke of the piston the pressure against opposite sides of the casing F will be equal. This prevents any expansion of the pulsation-chamber, and owing to the fact that the casing F is short and perfectly round it is particularly well adapted to struction than would otherwise be necessary with consequent saving in material and cost.
Hitherto it has been usual in hydraulic pumps to provide a single chamber in place of what I have herein termed the pressure or force and pulsation chambers and to locate the pressure or discharge valve above the cham ber. As the suction-lift of the pump is always to the pressure or discharge valve, the present construction, which lowers the positi'on of said valve, effects a material saving in suction=lift, with consequent advantages. Theinlet and discharge nozzles D2 G2 may be at opposite sides of the pum p-casing, as shown, or in any other convenient position above or below the plane of the plunger.
Although I have described my invention min utely as regards details of construction, I do not wish to be limited thereto unduly. I contemplate such changes in arrangement, form, and construction and such substitution of equivalents and omission of elements as circumstances may suggest or necessity ren der expedient Without departing from the spirit ot' my invention as defined by the claims.
What I claim as new, and desire to secure by Letters Patent, is-
1. In a pump, the combination with the pump-casing of a pressure or force chamber therein, provided with a discharge-opening, a pulsation-chamber casing within and surrounded by the pressure or force chamber, a piston working in the pulsatiomchamber, a valved suction-port about the piston and a valved pressure-port leading to the pressure or force chamber, substantially as described.
2. In a pump, the combination with the pump-casing of a pressure or force chamber therein, provided with a discharge-opening, a pulsation-chamber casing within and surrounded by the pressure or force chamber, a piston working in the pulsation-chamber, a valved suction-port about the piston and a valved pressure-port, below the top of the pulsatiolrchamber, leading to the pressure or force chamber, substantially as described.
3. In a pump, the combination with the pump-casing ot' a pressure or force chamber therein, provided with a discharge-opening, a pulsationchamber casing within and surrounded by the pressure or force chamber, a pistou working in the pulsation-chamber, a valved suctionport about the piston and a valved pressure-port coaxial with the piston leading to the pressure or force chamber, substantially as described.
In presence of- HENRY I-IASPER, WOLDEMAR HAUPT.