US 3756748 A
A valveless pump having two chambers, one of which is filled with a liquid which when oscillated displaces liquid from the other chamber into a receiving duct, through which the liquid is conducted to a desired location.
Description (OCR text may contain errors)
United States Patent 11 1 Thiele 1 Sept. 4, 1973  VALVELESS OSCILLATING 2,879,144 3/1959 Thornton 417 240 DISPLACEMENT PUMP 3,023,708 3/1962 Thiele 417/240 3,289,594 12/1966 Thiele 417/241  Inventor: Ernst Thiele, Staudingergasse ll,
Vienna, Austria FOREIGN PATENTS OR APPLICATIONS 22 il 29 1970 222,304 7/1962 Austria 417/389 780,157 7/1957 Great Britain 417/240  Appl. No.: 102,342
Primary ExaminerCarlton R. Croy1e I30] Forelgn Application D818 Assistant Examiner-Richard E. GIuck Jan. 2, 1970 Austria A 12/70 Attorney-[mine & Smiley  US. Cl 417/158, 417/241, 417/395,
. 417/413  ABSTRACT  i Cl 7/00 F04) 43/00 F04f 9/00 A valveless pump having two chambers, one of which  Field of Search 417/240, 241, 395,
417,389 383 413 417 151 158 1s filled with a liquid wh1ch when oscillated displaces liquid from the other chamber into a receiving duct, [5 6] References Cited through which the liquid is conducted to a desired loca- UNITED STATES PATENTS Hon.
7 Claims, 5 Drawing Figures PATENTEDSEF 41m sum 1 or 4 INVENTOR PATENIEU E 3.756.748
sum 2 or 4":
" INVENTOR HWWY/Y/EAE O NEY PAIENTED 41915 3756.748
SHEEI 3 0F 4 a INVENTOR Ems/sf E O NEY VALVELESS OSCILLATING DISPLACEMENT PUMP SUMMARY OF THE INVENTION A valveless oscillating displacement pump, which comprises two chambers connected by a transfer duct and two displacing members which operate in phase opposition and one of which is disposed in the chamber which precedes the outlet of the transfer duct and the other in the chamber which succeeds the outlet of the transfer duct.
This invention relates to a valveless oscillating displacement pump which comprises a member which consists of a piston, diaphragm or the like and is oscillatable by preferably electromagnetic drive means, a transfer duct, which may taper, if desired, in the direction of flow, and a receiving duct, which is in register with the outlet of the transfer duct.
Valveless oscillating displacement pumps are known in which the valve action is utilized which is due to the fact that nozzles have different resistances to flow in different directions. Those known pumps have a low noise and suffer wear owing to cavitation, which is ap-- preciable from about 2 meters water column when the pump discharges against atmospheric pressure.
Whereas a piston pump has been disclosed which comprises an oscillating nozzle and is free of this disadvantage, that pump can be'used only for handling water and the like because the provision of acid-resisting coatings or the like on the endangered components, particularly on the piston and cylinder, would involve an increase of air gap fringing and a reduced dissipation of heat to that the efficiency and capacity are much reduced.
Owing to the oscillation of the nozzle, the rlsk of cavitation in this pump is reduced and the suction into the chamber succeeding the. nozzle is assisted by the nozzle because it contracts said chamber.
The present invention relates to a valveless oscillating pump, in which cavitation occurs only from a relatively large total heat and which can be designed to resist acid without involving the disadvantagesset forth hereinbefore.
To accomplish that object, a displacement pump 'is proposed which is of the kind mentioned first hereinbefore and in which, in accordance with the invention, the oscillatable part consists of two displacing members which operate in phase opposition and one of which is disposed in the chamber which precedes the outlet of the transfer duct whereas the other is disposed in the chamber which succeeds the outlet of the transfer duct.
In this way, the suction into the chamber disposed in the transfer duct or succeeding the outlet thereof is assisted by a displacement of the corresponding amount of liquid from the chamber which precedes the transfer duct. Both the transfer duct and the receiving duct may consist of nozzles.
Further details of the invention will be explained more in detail with reference to the drawing, which shows by way of example some embodiments of the displacement pump according to the invention in axial sectional views.
FIG. 1 shows an embodiment of the pump comprising displacing pistons.
FIGS. 2 to 5 show embodiments of the pump comprising displacing diaphragms.
The basic concept of the displacement pump is shown in FIG. 1. The pump comprises a housing 3, which is divided into two chambers l, 2 and provided with an inlet duct 4, which opens into chamber 1. The two chambers l, 2 are connected by a jet nozzle 5, which tapers toward the chamber 1 and is in register with a receiving duct 6, which extends out of the chamber 1. In the present case, the displacing members consistof two single-acting pistons 9 and 8, which operate in phase opposition and are movable in cylinders 7, 10 connected to chambers l and 2, respectively.
This pump has the following mode of operation: As the piston 9 rises, liquid is sucked through the inlet 4 into the chamber 1 and at the same time the descending piston 8 transfers liquid from chamber2 through nozzle 5 into duct 6. During a movement of each of the pistons 9 and 8 in the opposite direction, the piston 8 sucks liquid into the chamber 2 and the piston 9 displaces-liquid from chamber 1 into chamber 2.
In the embodiment shown in FIG. 2, the displacing members consist of diaphragms 17 and 18 rather than of the pistons 9 and 8 described hereinbefore. The diaphragm l8 seals the chamber 2 at the rear end of the transfer nozzle 5 so that said chamber is restricted to the interior of the nozzle. Liquid-filled pipes 19 and 20 I non-magnetizable,
adjoin the diaphragms 17 and 18, respectively, on those sides which are remote from chambers l and 2, respectively, and these pipes are connected by a pipe 21, in which a piston 22 is substantially tightly and slidably fitted. An oscillatory motion at high speed can be imparted to the piston 22 by an external drive means, which is preferably electromagnetic. Such motion causes the diaphragms l7 and 18 to oscillate in' phase opposition so that the liquid is handled just as in the preceding embodiment.
In the embodiment shown in FIG. 3, the displacement pump has concentric chambers l' and 2 and the diaphragms l7 and 18 are made in one piece, which is gripped between the head 3' of the pump and the housing member 3". The diaphragms 17'and 18 are caused to oscillate in phase opposition by a piston 22, which is slidably mounted and reciprocates in a cylinder 33. Thelatter is formed by the wall of the housing member 3" and has a small wall thickness and consists of preferably insulating material.
' Through this material, the magnetic fields of an oscil drive means, e.g., an electric drive means. This feature will result in an intense cooling of the windings and will enable a compact design. Such an embodiment of the displacement pump is shownin FIG. 4, which differs from that of F IG. 3 in that the electric drive means 34 is disposed in the housing member 3" rather than being disposed outside the housing 3. The piston 22 is hollow and its interior forms part of the chamber 120 which adjoins the diaphragm 18. The piston 22 is movable on a hollow cylinder 133 and in a cylindrical section 133, which is coaxial with said hollow cylinder. The latter extends inwardly from the bottom of housing member 3" and communicates with chamber 120.
In the embodiment shown in FIGS. 5, the hollow cylinder 133 of the displacement pump constitutes a damping means and for this purpose is closed toward the chamber 120 and open on the outside, where it is sealed by a screw 134 and an interposed gasket 135. A ring 136 protrudes from the inside wall of the piston 22 and in the central position of the piston is in register with a recessed surface 137 of the hollow cylinder 133 so that two annular spaces 138 are defined between the cylinder 133 and the piston 22 and communicate with the interior of the cylinder'l33 through openings 139 in the wall of the latter and also communicate with chambers 119 and 120 through the clearances at the contacting surfaces of the piston. As a result, there are constrictions which damp the motion of the piston 22 as liquid flows from the interior of the cylinder 133 into the chambers 119, 120. The throttling can be controlled by the screw 134, which can be screwed inwardly to a greater or lesser extent so as to throttle the flow path leading into the lower annular chamber 138 to a greater or lesser extent so that the throttling of the flow of liquid in one direction or the other is increased or decreased. The diaphragms 17, 18 are concentric as in the embodiments shown in FIGS. 3 and 4. Besides, the diaphragm 17, 18 is covered on the liquidcontacted side by a protective sheet 140, which may be replaceable and resists any chemicals to be handled. As is apparent from the drawing, the sheet is gripped between the diaphragm and the head 3' of the pump.
It will be understood that various changes in design are possible within the scope of the invention. For instance, the two displacing members operating in phase opposition need not consist of pistons or diaphragms but may constitute bellows or two oppositely acting surfaces of one and the same displacing member or the like. A combination of a piston and diaphragm or of a piston and bellows is also desirable, and it has proved advantageous to use a hydraulic liquid for a transmission of force.
What is claimed is:
l. A valveless pump which comprises a pump housing having wall means defining two chambers connected by a transfer duct comprising a jet nozzle, an inlet duct and an outlet duct opening into one of said chambers with said outlet duct in said wall means opposite and aligned with said jet nozzle, said outlet duct spaced relative to said jet nozzle to receive fluid directly therefrom, and means for displacing a liquid, said means comprising two reciprocable liquid displacing members which operate at high, speed in phase opposition and one of which is disposed in the chamber preceding the transfer duct and the other in the chamber succeeding the transfer duct.
. 2. A pump as set forth in claim 1, wherein the reciprocable members comprise hydraulically driven diaphragms.
3. A pump as set forth in claim 2, wherein the diaphragms are concentric.
4. A pump as set forth in claim 2 comprising an electric drive system at least partially in said housing for imparting a reciprocatory motion to a hydraulic liquid which serves to drive the diaphragms.
5. A pump as set forth in claim 2, wherein the diaphragms are covered by a protective sheet, which is dis posed between the diaphragms and a part of the pump housing.
6. A pump as set forth in claim 2, wherein each diaphragm on that side thereof which is remote from the transfer duct sealingly adjoins a chamber and these chambers communicate with a piston adapted to perform reciprocatory motion.
7. A pump as set forth in claim 1, wherein an adjustable, hydraulically acting device is provided for damping the movement of the fluid to which an oscillatory motion has been imparted.