US 1142544 A
Description (OCR text may contain errors)
J. B. VERNON & M. J. SIEFFERT. COMPRESSION AND SUCTION DEVICE. APPLICATION FILED Inc. 29, 1913.
1,142,544. Pa'oenmd June 8, 1915.
WITNE/S SES 6 flINVENTORS WW 7 M UNITED STATES PATENT OFFICE.
JAMES B, VERNON, OF PITTSBURGH, AND MARTIN J. SIEFFEBT, OF WIBETON, PENNSYLVANIA.
COMPRESSION AND SUCTION DEVICE.
Specification of Letters Patent.
Patented June 8, 19-15.
Application filed December 29, 1913. Serial No; 809,412.
To all whom it may concern.
Be it known that wegJaMns B. VERNON and MARTIN J. SIEFFERT, who are respectively residents of Pittsburgh and Wireton P. 0., both in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Compression and Suction Devices, of which'the following is a specification.
This invention relates to apparatus for producing suction or compression, or rotary pumps, and particularly to that class of pumps embodying a chamber in which is eccentrically mounted a rotary hub or piston carrying a number of movable blades which sweep around a crescent shaped space between the piston and outer casing and force the fluid thcrethrough.
.The object of the invention is to provide a: pump of the type described which .is more eilicient than prior pumps, and in which the mbvable blades are.held yieldingly against the end walls or heads of the casing, but
without binding thereon, so that leakage of air around the blades is prevented.
A further object of the invention is to provide a pump, in which the blades are each formed of a plurality'of members, part ofwhich are held yieldingly in contact with each end wall or head of the casing, and all of which are held yieldingly in contact with the side casing wall, so as to produce a perfectly sealed joint between the casing and all of theedges of the blades.
A further object of the invention is to provide, in a pump of the type described, means for producing a flow of lubricant down around the side faces of the piston blades, or the members forming the same, so as tothoroughly lubricate all of the moving parts of the ump, and insure a tight and eflicient seal etween the edges of the blades and the casing, and thereby increase the efliciency of the pump.
Further objects of the invention are in part obvious and in part will appear more in detail hereinafter.
In the drawings Figure 1 represents a longitudinal sectional view, on the line 1-1, Fig. 2, of a. pump embodying the invention, the lower half'ofi the hub or piston being shown in side elevation; Fig. 2 is a sectional elevation on the line 2-2, Fig. 1, looking in the direction of the arrows; Fig. 3 is a. perspective view of the hub or piston,
' two of the blades being omitted; Fig. 4 is a perspective view of a single blade member. and Fig. 5 is a side elevation; of a piston blade. I
Referring to the drawings, which illustrate one of many forms of the invention, 1 indicates a suitable casing having therein a cylindrical bore or chamber closed at its ends by the heads 2 and 3. One of the end heads may be integral with the cylindrical portion or side wall of the casing, but in the form shown both of said heads are separate and are clamped to the end faces of the cylindrical portion by tap screws or bolts 4. The rotor comprises a hub or piston 5, which has a large cylindrical portion fitting snugly between the end heads of the casing, and which at one side, as at 6, bears against the side casing wall. This hub or piston is provided with a plurality of circumferentially spaced radial slots or sockets 7, three being shown, in each of which is mounted a movable piston blade. Each blade is pressed yieldingly outward against the side casing wall by one or more springs 8, as shown in Fig. 1, said springs bearing at their inner ends against the bottoms of the slots 7 and having their outer ends lying in notches 9in the inner edges of the piston lad'es. These springs allow the blades to move radially in the slots 7 as they travel around the crescent shaped chamber 10, lying between the piston and the side casing wall. The piston may be rotated in any suitable manner and as shown is provided with end journal portions II extending into bearings in the heads of the casin One of said journals is extended beyond its-bearing for connectionto the power driving means, and' is shown as provided with fast and loose pulleys 12' and 1'3 for a driving belli The particular arrangement of the driving means is not essential. Thelower half ofthe casing is enlarged and cored out to form two chambers 14 and I5. Chamber 14' is on the induction side' of the casing and is provided with a connection 16' which may lead to any suitable place where it is desired to produce suction. Said induction chamber 14 communicates with the crescent shaped chamber 10 through a plurality of ports or openings 17 in the side casing Wall- The eduction chamber 15 is provided with a connection 18 leading to any suitable location where it is desired to produce pressure,
such as an ordinary blowpipe. It communicates with the eduction end of the chamber 10 through one or a plurality of ports or openings 19 in the side casing wall.
Portsor openings 17 and 19 are elongated circumferentially of the casing, so that they flow of fluid through the pump, thereby increasing its efficiency andmaintaining constant maximum compression or suction efi'ect. f
In order to increase eificiency means is provided for circulating through the machine a continuous stream of liquid, which maybe glycerin or some similar material, but is preferably an oil and thereby serves as a lubricant. As shown in the drawings. eduction chamber 15 is provided with an outlet 20 at its lowest point,.from .which a suitable conduit or pipe, indicated at 21, leads to an inlet 22 at ornear' the-top of induction chamber .14, Said conduit may be provided with any suitable form of regulating valve 23 for controlling the: flow of liquid through the pump. In use of the apparatus a1 quantity 0 liquid, such as oil, is poured into the chamber v1 5. When the hub or piston is rotated a suction efl'ect is produced in chamber 14, thereby withdrawing the oil from chamber 15 and causing it toflow through conduit 21 into chamber 14;. The oil is carried into the compression chamber 10 with the inflowing air and penetrates into all crevices of the moving parts and covers every surface thereof, so that it effectively seals the spaces between the piston blades and the cylinder walls and therefore prevents the escape of air around the blades.
In pumps of this character, as heretofore constructed, it has been necessary to form the piston blades with great accuracy,'as they must notv only. be held yieldingly against the side wall of the cylindricalcasing, but must also be tightly sealed against the end heads of the casing. Inaccuracies in the shape of the casing or in the length of the piston blades are likely to cause the blades to bind in the casing or else leave an unsealed space between their end edges and the end heads of the casing. In order to prevent the blades from binding in the casing and to insure a tight seal, we. preferably form each piston blade of a plurality of members which are movable endwise with respect to each other, one member of each blade being'fo'rced yieldingly against one end head of the casing. In thethan the distance between the end casing heads so that it cannot bind therebetween. The blade members are furthermore each provided with a longitudinal slot or opening 25 and a side lug or projection 26 which projects into and moves in the longitudinal slots 25 o'f the othermember. Slots 25 are made long enough so that there is a space between the two side projections 26, said space being 'providedfor a compression spring 27 which forces the blades apart endwise. Each blade is consequently held yieldingly, by the spring 27, in contact with one end headof the casing, and inequalities in the length of the chamber 10 are-taken up by relative endwise movement between the blade members of each pair. The inters engaging projections 26 and slots 25 form guides which prevent other than longitudinal motionbetween the blade members so that they move together radiallyinwardly and outwardly. as before described.
To insure thorough lubrication of the blades. and to also insure the penetration of the lubricating liquid into all of the crevices and between all contacting surfaces within the pump, we preferably form each piston blade, or the members composing the same in such manner as to continuously pump oil down along the side surfaces of the blades. As shown the ,outer edges of the slots or sockets 7 are beveled or chamfered, as at 28, to form pockets which trap and hold the lubricating material. The contacting inner side faces of the blade members of each pair are smooth and uninterrupted, but their outer side faces, which contact with the side walls of the slots 7, are provided with suitable pockets, shown as longitudinal grooves or channels 29, the inner surfaces of which are. beveled or inclined, as at 30, and the outer surfaces of which are straight or square, as shown at 31, so that in end view the grooves'in the blade look like a series of ratchet teeth, as shown in Fig. 4. One or more of the pockets or grooves 29 are located near the outer edge of the piston blades, so that when each blade reaches the widest point in the chamber 10, as shown at the top in Fig. 2, these pockets or grooves are entirely outside of the slots 7. Each time the blades move inwardly the oil pockets 29 take up a part of the oil trapped in the pockets 28' and carry it downwardly along the side walls of the slot 7. On the outward movement of hind and is scraped up and collected by the next pocket 29 on the next inward movement of the blade. The pockets 29 therefore produce a pump effect, carrying the lubricating material downwardly along the contacting side faces of the blades 24 and slots 7 by a step by step movement, so that it is forced clear'to the bottom of the slots 7 and works its way out at the ends thereof into the spaces between the end faces of the hub or piston and the end heads of the casing. This insures thorough lubrication of all working surfaces and a tight seal between the end and side edges of the blades and the casing wall. Some of the oil is continuously discharged from the pressure chamber through the eduction ports 19 and is collected in the chamber 15. This oil however, drains out through the outlet 20 and is carried back to the induction side of the casing so that the oil is circulated continuously through the pump.
' The machine described may be used for various purposes, either for producing suction or compression. It may be used for dental purposes or for cleaning, but is also adapted for producing compression for operatin blow-pipes or like devices. It is very e cient and produces a continuous and uninterrupted suction or compression effect of maximum efiiciency. It is self lubricating so that it will run steadily and continuously or may be operated intermittently over long periods of time without attention on the part of the operator, so that it is particularly adapted for use by unskilled operators or in places where it is either unlikely to receive attention or is more or less inaccessible. It will therefore stand considerable neglect or even hard or rough usage without material loss of efliciency.
What We claim is:
1. A machine of the character described, comprising a casing provided with a chamber, a rotor eccentrically located in said chamber, and provided with a longitudinal slot beveled at its edge to form an oil pocket, a blade movably mounted in said slot, and a pocket in the side face of said blade arranged to pass said oil pocket during each rotation of the rotor and carry oil down into the rotor slot.
2. A machine of the character described, comprising a casing provided with a chamber, a rotor eccentrically located in said chamber and provided with a longitudinal slot beveled at its edge to form an oil pocket, a blade movably mounted in said slot and provided with a longitudinal groove arranged to pass said oil pocket during each rotation of said rotor and carry oil down into said slot.
In testimony whereof, we have hereunto set our hands.
JAMES B. VERNON. MARTIN J. SIEFFERT.
Witnesses ELBERT L. HYDE, GLENN H. LERESCHE.