US2282569A - Automatic suction circulating pump - Google Patents

Description

G. 'FABIG AUTOMATIC SUCTION CIRCULATING PUMP May l2, 1942. l

Filed April 17, 1959 [bye/#0m earg Fa g Patented May.A 12, 1942 AUTOMATIC SUCTION CmCULATING PUMP Georg' Fabig, Berlin-Frohnau, Germany Application April 17,1939, serial' No. 268,156

In Germany April 21, 1938 2 6 claims. (ci. 10h96) Y This invention relates to an automatic suction circulating pump which operates partly as water ring pump and partly as centrifugal pump, a

vmore favorable efficiency being obtained than in the case of water ring pumps proper. Therefore,` only the sucked-in air and a. small quantity of the sucked-in liquid are forced by means ofthe water ring through the pressure slot lo. cated n ear the wheel hub into the pressure chamber of the pump, whereas the main quantity is flung out of the pallet wheel by the action of centrifugal force and conducted into the pressure chamber preferably through anouter outlet arranged near the periphery of the wheel. So as to obtain at the same time a large quantitive delivery it is important to force into a suitably arranged reception chamber in the casing, herein called the pressure channel, the quantity of liquid toV be delivered by centrifugal eiect, immediately after it has been sucked-in (or after its supplementing quantity has been sucked-inl', that is while it is still within the sector in which vby the centrifugal force effect is thereby increased.v l

In the accompanying drawing: Fig. 1 shows a side elevation partly in section of a pump accordingto the invention,l which has three pressure stages.

Fig. 2 shows one of these stages on slightlyenlarged scale and in section on line II-II of Fig. 5`is a section according to line V-V ofv Fig. 6 through the paddle'wheel and through another construction of one-half of the casing.

the suction slot is located, and to allow this quanv tity of liquid to circulate in this channel with the pallet wheel until it reaches4 the passage lead-v ing to the pressure chamber. Such a construe-4 tion is known from German Patent No, 618,414, granted to applicant. r The invention consists in that symmetrical paddle wheels with continuous side edges are employed. The channel for the liquid conveyed by centrifugal force effect is provided on the one side, and the channel for the liquid conveyed by displacing effect is arrangedon the other side of the paddlewheel in the pump casing. The discharge aperture forthe displaced liquid is separatedfrom the discharge aperture for the `liquid conveyed by centrifugal force effect.

The two channels for the liquid conveyed by centrifugal vforce effect and for the liquid con- 40 veyed by displacer effect extendY practically un- `symmetrically the one relative to the other. The course of the channels depends on-their different manner of operation. The cross-section of the channel designedfor receiving the circulating watering can reduce in the sector of the discharge aperture for the liquid conveyedby c entrifugal force effect. This liquid is therebyl de- Fig.- 6 shows the casing half shown in section in Fig. 5 viewed from the inner side, and

` Fig. 7' is a section lthrough a, portion of this casing half on the line VII- VII of Fig.. 6.

In Fig. 1 a designates' the body forming the suction chamber andb the body forming the parts f and ;g are provided. The parts c and d enclose the working space of the stagein which the pallet wheel h rotates. In the case of a single stage pump, it is evident that the parts a ande. or and d may be madev as single pieces.

The channel i begins in the sector of the admission port e. The cross-section-of this chanz nel enlarges in this sector., In the sector ofthe discharge port g of the channel l' for the liquid conveyed by centrifugal force effect the crosssection 1 reduces4 again, that is, at this point the water fromthe channel i again enters from the l rside into the chambers of-the pallet wheel and flected and the owing out through the, discharge aperture is assisted. The channel which takes up the liquid conveyed by centrifugal force effect may extend in spiral shape, so that the distanceof the channel from the axis ofthe pump gradthereby assists the outilowof the water `through the port g and presses a portion of the liquid to be conveyed through the discharge port f into the next following pump stage or into the, pressure socket b'.

The pressure channel I' for the liquid conveyedv by centrifugal force effect begins at m also in the' sector of the admission port e and .has at its corn-4 menc'ement a shallow depth in axial direction at j correspondingly larger radial height. .The liquid current to be conveyed by V.the pallet wheel is therefore in intimate contact .with the edges of v ually increases. The increase of pressure caused the pallets over their entire length: The chanarranged to the direction of ow.

nel lis made in spiral shape so that at its end n it is located chiey outside the periphery of the pallet wheel. At the same time the cross-sectional shape of the channel changes gradually in such a manner that the depth in axial direction increases whereas the radial height decreases. This increase in depth in -axial direction need only be up to the beginning of the outer outlet aperture g, the depth can then become gradually less in proportion as the liquid is lead oil through this outlet.

In this form of construction the reception4 decreases at the end corresponding to the return movement of the water ring. The radial width is assumed to be constant in this form of construction, it may, however, vary in the same manner as in the case of the pressure channel l'. The pallet wheel h, when the water ring chamber is thus constructed, need have no recesses, that is may have pallets of constant axial width.

It is advisable to provide a recess o in the housing parts c and d by which recess the ends of the two channels i and l" are connected across the periphery of the pallet wheel. Thus, an axial pressure is exerted on the liquid current in the passage l by the bevelled side faces of the chamber i outside the pallet wheel, and this pressure assists the deection of the liquid at the outlet aperture y.

In the form of construction illustrated in Figs. 5 to 7 the spiral shape of the pressure channel l' and the gradual reduction in radial width thereof is utilized to enable the outlet aperture g to be The liquid current at the point p passes behind the wall q which closely surrounds the ends of the ets of the pallet wheel and shuts oil' the portion of the working space under suction from that under pressure. 'Ihe pressure channelr on the side of the housing part d belonging to the pressure chamber is extended in the manner illustrated in dotted lines, so that the liquid can pass into the pressure chamber without the necessity to change its direction of flow. This extension r oi the pressure channel is therefore located `outside its commencement n and on'the other side of the housing wall. The smooth oiI-ow of the centrifuged liquid is shown particularly clearly in Fig. 7 which illustrates a portion of the housf ing part d in developed state.

The favorable e'ect of the new construction is proved by the improvement in the degree of efciency of the automatic suction circulating pumps. An appreciable improvement is already noticeable when merely the pressure channel is of the spiral shape described. It has been ascertained by measuring that with a high percentage air exhaustion in the suction line such as was hitherto only attainable with purely water ring pumps, degrees'of emciency of 45% and more can be attained such as have never hitherto been attainable byautomatic suction circulating pumps.

I claim: 1. Rotary suctio'n pump,` which delivers a portion of the sucked-in liquid by displacement effect and another portion by centrifugal force,

comprising a pallet rotor with symmetrically formed vanes having continuous side edges, a casing enclosing said rotor and having inlet ports and outlet ports, the outlet port of the displaced portion of liquid being separated from the outlet port of the portion delivered by centrifugal force, a channel for the liquid ring exerting the displacing eect provided in said casing on one side of said vanes, the cross-section of which increases in the sector of the admission port and decreases again in front of the discharge port for the displaced portion of the liquid, and a passage for the liquid delivered by centrifugal Veifect arranged in said casing on the opposite side of said vanes.

2. Rotary suction pump, which delivers a portion of the sucked-in liquid by displacement effect and another portion by centrifugal force, comprising a pallet rotor with symmetrically formed vanes having continuous side edges, a casing enclosing said rotor and having inlet ports and outlet ports. the outlet port of the displaced portion of liquid being separated from the outlet port of the portion delivered by centrifugal force, a channel for the liquid ring exerting the displacing effect provided in said casing on one side of said vanes, the cross-section of which increases in the sector of the admission' port and decreases in the sector of the discharge port for the liquid conveyed by centrifugal force, and a passage for the liquid delivered by centrifugal effect arranged in said casing on the opposite side of said vanes, said channel and passage extending asymmetrically the one to the other.

3. Rotary suction pump,'which delivers a portion of the sucked-in liquid by displacement effect and another portion by centrifugal force,

comprising a pallet rotor with symmetrically formed vanes having continuous side edges, a casing enclosing said rotor and having inlet ports and outlet ports, the outlet port of the displaced portion ofliquid being separated from the outlet port of the portion delivered by centrifugal force, a. channel for the liquid ring exerting the displacing eiect provided in said casing on one side oi' said vanes the cross-section of said channel decreases in the sector of the discharge port of the liquid conveyed by centrifugal force, and a passage for the liquid delivered by centrifugal effect arranged insaid casing on the opposite side of said vanes, said channel and passage extending asymmetrically the one to the other.

4. Rotary suction pump, which delivers a portion of the sucked-in liquid by displacement effect and another portion by centrifugal force, comprising a pallet rotor with symmetrically formed vanes having continuous side edges, a casing enclosing said rotor and having inlet ports and outlet ports, the outlet port of the displaced portion of liquid being separated from the ,outlet port of the portion delivered by centrifugal force, a channel for the liquid ring exerting the displacing eifect provided in said casing on one side of said vanes, the cross-section of which increases in the sector of the admission port and decreases again in the sector of the discharge port for the displaced portion of the liquid, and a passage for the liquid delivered by centrifugal effect arranged in `said casing on the opposite side of said vanes, said passage having at its beginning little axial depth but great radial height, and changing its cross-section shape in the direction of rotation so that the axial depth increases and the radial height decreases.

5. Rotary suction pump, which delivers a porsage for the liquid delivered by centrifugal effect tion of the sucked-in liquid by displacement effect and another portion by centrifugal force,

comprising a pallet rotor with symmetrically that the distance from the axis slowly arranged in said casing on the opposite side of said vanes, said passage being spiral-shaped so increases in the direction o! rotation.

6. Rotary suction pump as specied in claim 1,. in which the outlet port of said passage is arranged so that theliquid is discharged in the vplane of rotation in tangential direction,l and a channel is provided in said casing and connected to said outlet port, vthe radial distance of this channel from the axis ofthe pump being greater than the distance of said passage.

GEoRG FABIG.

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