US 2313550 A
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Description (OCR text may contain errors)
March 9, 1943. c. J. HUBER 2,313,550
VALVE STRUCTURES Original Filed Jan. 8, 1941 2 Sheets-Sheet 1 47 77 w won/tom Char Les 667;
March 9, 1943. c. J. HUBER 2,313,550
VALVE STRUCTURES Original Filed Jan. 8, 1941 2 Sheets-Sheet 2 l I w \i\ i Cher/271 63 67:,
Patented Mar. 9, 1943 r 2,313,550 vALvE STRUCTURE Charles J Huber, West Chester, Pa, assignor, by mesne assignments, to Cleaver Brooks Company,
Original application January 8, 1941, Serial No. 373,693. Divided and this application November 18, 1941, Serial No. 419,644
' are forced together each of which has a curved 7 Claims.
This invention relates to valve structures andthe present application -is a division of my application Serial Number 373,693, patented June 9, 1942, No. 2,285,974.
One of the objects of the invention is to provide a valve of utmost simplicity of construction, in which sticking and clogging of parts and eddies in the current of the fluid passing therethrough will be substantially eliminated, and complete closing will be assured.
Further objects are to provide such a valve which will be silent in operation, and which may be formed of such materials as will prevent contamination of, or attack by, the fluid passing therethrough.
The invention is disclosed herein as embodied in a pump structure, in conformity with the original application of which the present application'is a division, and additional objects of the invention and the novel features of construction will be apparent from the following specification when it is read with reference to the accompanying drawings, in which:
Fig. l is a plan view, partly in section, of a pump structure incorporating valves embodying the invention, the lid structure being removed;
Figs. 2, 3 and 4 are views in transverse, vertical section of the structure shown in Fig. 1, including the lid or cover, taken on the line 2-2, the line 33 and the line 4%, respectively, of Fig. l, and showing, respectively, the inlet valve cam, the compression cam and the outlet valve cam;
Fig. 5 is a view in vertical, longitudinal section taken on line 55 of Fig. 1,- but illustrating a modified structure in which a single core is substituted for the two separate end cores; and
Fig. 6 is a fragmentary view in cross section taken on line 6-6 of Fig. 1.
In general, the valve of the present invention comprises a conduit having a flexible wall which is compressed against an inner core that has the same general cross-sectional contour as the opening in the conduit and, in the embodiment illustrated, the flexible Wall is in the form of a round tube of resilient, compressible material.
such as rubber having a wall of such thickness that after compression and release it will resume its normal size through its inherent resiliency. It is desirable that the compression of the tube be in a substantially radial direction and applied to substantially all points of the circumference of the tube, and to this end two outer members or cover of the pump inner surface engaging the tube at an area extending for about one fourth'of the circumference of the tube and each of which has inclined surfaces which engage and wedge toward each other two inner members which each have a curved inner surface engaging the tube at the intermediate-areas, each extendingfor about one fourth of the circumference of the tube. It will be appreciated that any suitable means may be employed to force the pairs of compressing members toward each other. In incorporatingthe valve construction in the Which it is illustrated in the present embodiment one of the outer members is fixed while the other outer member is forced toward it by a cam, the distortion ofthe wall of the tube during compression compensating for the lack of uniform movement, but it will be apparent that if desired a cam may be provided to move each of the outer compressing members. The various cams, are so shaped, of course, when the valve is used in a pump, that when the inlet valve portion is closed, by compression of the tube against the core, and the outlet valve portion is open, a portion of the tube intermediate such valve portions is compressed, either against a core or not as desired, after-which the outlet valve portion is closed, the inlet valve portion is opened and the intermediate portion i permitted to expand 'by its inherent resiliency to draw in additional fluid, after which the cycle is repeated.
In the embodiment of the valve in a pump as illustrated two tubes are shown, operated alternately by a single cam-shaft located between them, and having'separate inlets and separate outlets, but it will be apparent that, if desired, the
two inlets may be connected by a manifold, or the two outlets may be connected by a manifold, or both an inlet manifold and an outlet manifold may be provided.
In the embodiment shown in the drawings a generally rectangular casing, having a base ll, side walls I 2 and end walls I3, is provided with a flat, detachable lid or cover [4 secured thereto by screws l5, and perforated lugs iii are preferably provided extending laterally from the base I I, to facilitate securing the casing as a whole to a suitable base orsupport.
A cam shaft I1 is mounted in the center of the casing, one end being mounted preferably in a closed bearing support extension l8 formed integrally with one end wall [3, while the other end of the shaft is mounted in, and extends through,
pump structure in tact with it throughout its a tubular extension l9 projecting from the other end wall l3, the shaft being preferably splined at 2|) for connection to any suitable means for rotating such cam shaft.
Two tubes, 2| and 22, are provided on opposite sides of, and parallel to, the shaft l1, and are formed of resilient material such as rubber or any of the so-called synthetic rubbers or rubber substitutes, selected primarily with regard to their resistance to the particular gas or liquid that is to be pumped. The resiliency and compressibility of the material of each of such tubes and the thickness of its wall are such that, under compression, the external circumference of the tube will be decreased with an accompanying increase in the thickness of the wall but when the compression is relieved the tube will assume its normal contour and size by its inherent resiliency.
The tubes may be mounted in the casing in any suitable manner, and in fact each tube may be merely a part, located within the casing, of a tube which extends from a source of supply through the casing to a discharge point, and may even be slidable endwise relative to the casing. However, it is generally preferable, as shown, to provide tubular coupling members 23, each of whichhas a screw-threaded engagement 24 with an end wall |3 of the casing, is threaded internally at 25 for connection to a suitable supply or discharge pipe, and has a portion 26 extending within the casing upon which an end of the tube 2| or 22 may be secured. The ends of the tubes 2| and 22 are secured to such internally-extending portions 26 by a clamp, as shown in Fig. 6, having a bottom portion 21 to which an upper portion 28 is connected by screws 29, thereby compressing the end of the tube against the portion 26. Each of the internally-extending portions 26 has a core member 30, 3|, 32 and 33, respectively, anchored thereto by a pin 33 which extends diametrically through such portion and core member. Such core members are formed of any suitable material which is preferably relatively hard and non-compressible, and each core member is preferably of cylindrical shape with rounded ends, as shown, its diameter being somewhat less than the normal internal diameter of the tubes but of such size and shape that the tube will be compressed into conentire circumference.
For each of the tubes 2| and 22 three pairs of outer blocks are provided, each such pair having a corresponding pair of inner blocks. The outer blocks 34 and 34 at one end of the tube 2| are preferably identical with the outer blocks 36 and 36 at the other end of the tube, while the intermediate blocks 35 and 35 are of the same crosssectional shape as the other blocks but preferably of greater length. Each of these outer blocks is of such height as to be slidable between, and be guided by, the bottom H and the lid l4 of the casing. As shown, screws 31 each having a locknut 38, are mounted in the side walls |2 of the casing by means of which that outer block of each pair which is adjacent to such side wall may be adjustablypositioned. The other block of each pair is preferably provided with a hardened roller or wear piece 39 for engagement by a cam, as will be later described. Each of the outer blocks is formed. with a curved surface 40 of a radius approximately the same as, less than, that of the outer surface of the tube 2| or 22 and engaging the tube through slightly less than one fourth of its circumference, and is also formed, at each side of said curved surface, with an inclined surface 4| for wedging. engagement but preferably slightly with the corresponding pair of inner pressure blocks 42, 43 and 44, respectively. Each of such inner pressure blocks is of roughly triangular shape in cross-section, having a curved surface 45 generally conforming to and engaging approximately one-fourth of the circumference of the tube 2| or 22, the other surfaces 46-being flat and in sliding engagement with the inclined surfaces 4| of the corresponding outer blocks. It will be apparent that as any pair of the outer blocks are forced laterally toward each other, by movement of one or both of such blocks, the corresponding inner blocks 42, 43 or 44 will be wedged toward each other in a vertical direction and thus the tube will be compressed radially from four directions, the pressure being effective on surfaces each only slightly less than one fourth of its circumference. As best shown in Figs. 2, 3 and 4, the outer blocks are each formed with recesses 41 between its curved surface 40 and its inclined surfaces 4| to receive the corner portions of the inner pressure blocks during the compressing movement.
The details of construction and operation of the means for compressing tube 22 are identical with those for compressing tube 2|, and in the present embodiment compression of both tubes is effected by a single cam shaft, although it will be understood that similar cam shafts could be used to move the outer blocks 34, and 36, if desired. Upon the shaft there are provided a plurality of cams, comprising an inlet-valve cam 48 cooperating with pressure blocks 34 and 34*, one or more intermediate cams 49 cooperating with pressure blocks 35 and 35 and an outletvalve cam 50 cooperating with pressure blocks 36 and 36 As will be apparent from Figs. 2 and 4 the inlet-valve cam 48 and the outlet-valve cam 5|! are of identical shape but are circumferentially displaced by 180, the shape being such that in operation they hold the valve closed through half of a revolution of the shaft, the valve being fully open for approximately one quarter of a revolution. The intermediate cam or earns 49 are preferably so shaped that they have no compressing effect through 180 of revolution, gradually move the pressure blocks 35 toward the block 35 during the succeeding 135 of revolution and rather abruptly relieve the pressure during the remaining 45 of revolution. The shaft I1 is rotated in a counter-clockwise direction, and it will be evident that for each revolution fiow will be effected from tube 2| during 135 of revolution and, after a further 45 of revolution for valve operation, from tube 22 during a further 135 of revolution.
In the modified structure illustrated in Fig. 5
1 a single core member 5| is providedin each tube instead of separate core members 30 and 3| or 32 and 33. The coupling members 52 are identical with the coupling members 23 shown in Fig. 1 but instead of being in threaded engagement with the end walls |3 they are secured thereto by screws 53, or similar means, and the core member 5| is anchored in place by pins 54 each of which passes through one end of the core member 5| and the corresponding coupling member. Inasmuch as, in the structure shown in Fig. 5, the intermediate blocks 35 and 35*, together with their corresponding inner pressure blocks 43 force all of thatportion of the tube that is between the end or valve portions into contact with the core member 5|, no reservoir of fluid is left between the valves so that as a result all fluid that has entered through the inlet valve will be discharged from the outlet valve, which of course is particularly desirable in pumping compressible fluids such as gases.
It will be evident that the valve structure shown is capable of use for many purposes other than as part of a pump structure, and that by its incorporation in a pump structure as shown in the present embodiments, or in any other structure, a flow of fluid can be effected in a straight line without any great mixing effect or danger of contion.
1. In a valve, the combination of a tube of resilient, compressible material, a body within said tube having a cross-sectional Shape conforming generally to that of the opening in said tube and a cross-sectional area less than that of the opening in said tube, and means for intermittently compressing said tube toward the periphery of said body comprising a plurality of members spaced about said tube and slidable toward and from the tube and means for intermittently sliding said members inwardly toward said body.
2. In a valve, the combination of a tube of resilient, compressible material normally tending to assume a given shape and size, a body within said tube having a cross-sectional shape conforming generally to that of the opening in said tube and a cross-sectional area less than that of the opening in said tube, and means for intemittently compressing said tube toward said body to decrease the opening between them, comprising a pair of members on opposite sides of said tube, at least one member of said pair being slidably mounted and movable toward and from the other, and means for intermittently sliding said members toward each othe -3. In a valve, the combination of a tube of resilient, compressibl material, a body within said tube having a cross-sectional shape conformin: generally to that of the opening in said tube, and means for intermittently compressing said tube toward the periphery of said body comprising a plurality of members, each formed with a dished inner surface engaging the outer surface of said tube, and means intermittently forcing said members toward said body.
4. In a valve, the combination of a tube of resilient, compressible material, a body within- .said tube ha I a cross-sectional shape conforming generally to that of the opening in said tube and of a cross-sectional area less than that said tube, and means for intermittently compressing a portion of said tube to reduce the cross-sectional area of the openin therein comprising a plurality of members located about said tube, certain of said members being slidably mounted and guided for movement toward the center of said tube and mechanical means for intermittently sliding said members toward said body.
5. In a valve, the combination of a conduit comprising a tube of resilient, compressible material normally assuming a definite size and shape, a body within said tube of less cross-sectional area than that of the opening in said tube, a first pair of members each generally of triangular shape in cross-section and having an inner face curved to engage and, substantially correspond to the contour ot the outer surface of said tube, a second pair of members each having a pair of inclined' faces, one engaging an outer-face of each of said first members, and means for forcing said second pair of members toward each other to thereby force said first pair of members and said second pair of members inwardly toward said body and reduce the opening between said tube and said body,
6. In a valve, the combination of a tube of resilient, compressible material, a body within said tube having a cross-sectional shape conforming generally to that of the opening in the tube and a cross-sectional area less than that of the opening in the tube, and means for intermittently compressing said tube toward the periphery of said body comprising a pair of blocks arranged at opposite sides of the exterior of the tube with the inner surfaces of said blocks recessed to receive the tube between them, at least one of said blocks being movable toward and from the other, andmechanical means for alternately forcing the movable block toward the other and releasing said movable block.
7. In a valve, the combination of a tube of resilient, compressible material, a body within said tube having a cross-sectional shape conforming generally to that of the opening in the tube and a cross-sectional area less than that of the opening in the tube, and means for intermittently compressing said tube toward the periphery of said body comprising a pair of blocks arranged at opposite sides of the exterior of the tube with the inner surfaces of said blocks recessed to receive the tube between them, at least one of said blocks being movable toward and from the other, mechanical means for intermittently forcing the movable block toward the other and releasing the same, and a second pair of blocks interposed between the first pair and movable toward the tube by movement of the first pair of blocks toward each other.
CHARLES J. HUBER.