US1782282A - Rotary pump - Google Patents

Description

Nov. 18, 1930. A BARGEBQER 1,782,282

ROTARY PUMP FledrMay 14, 1929 Patented Nov. 18, 1930 l, UNITED STATES PATENT oFFlcF.

. ADOLF BABGROER, F THEn BAGUE, NETHERLANDS ROTARY PUMP Application led Icy 14, 1929, Serial No. 862,989, and in Great Britain April 4, 1989.

My present invention, Lwhich relates to a rotary pump or compressor, more especially to a self-sucking rotary pump for liquids, gases or mixtures of these fluids, hasv for its I principal object a pump of this type which, while simple and reliable in construction, is exceptionally efcient in operation. With this object in view, I suggest to provide the annular,crescentshaped or otherwise formed l'channel between the circumferential portion of the'blade wheel or impeller and the inner wall of the pumping space with inwardly xtending shoots or branches forming recesses in one or in both side walls of 4said space.

In order that my invention may be clearly understood'by one skilled inthe art, I shall describe some embodiments thereof with reference to the annexed drawing, on which Fig. 1 is a vertical, axial sectional Ielevan tion of a rotary pump,

Fig; 2 is an end elevational inner view of -said pump and p Figs. 3-5 are innerA elevational views of modified sidewalls of the pumping space.v

In accordance ing of the pump is composed of a casting 1 provided with a suction nozzle 3, and of a casting 2 having a liquid chamber 4 and a ,discharge nozzle 5.. The shaft 6, which is supported by -a bearing 7 and sealed by a stuiiing box 8 both located in the casting 2, carries at its one end, intermediate between both castings 1 and 2, a blade wheel or im peller 9 secured thereto by meansfof a nut 10.

The pumping space has a cylindrical circumferential wall 11 which is eccentric` with respect to the shaft 6 and the impeller 9, so that a crescent-shaped channel 12 is left between the circumference of the impeller and the said cylindrical wall 11. -Said channel 12 has a plurality of shoots 13 forming recesses in both side walls of the' pumping space, i. e. in the vfacing walls of vcastings 1 and 2, said shoots being inwardly and spirally bent in the direction of. rotation of the impeller and closeds at their inner ends.

Withinthe channel 12, the casting 1 is provided with an inlet openingv 14 and the casting 2 both with an outlet opening 15 and a 5 back flow opening 16.

with Figs. 1 and 2, the cas-9 In the embodimentslshown in Figs. 3-5, the impeller `is assumed to be coaxial with and snugly fitting within the cylindrical pumping space, the channel 12 b'einglocated on one or, preferably, on either side of the impeller. AIn tangential direction, said channel 12 only extends segmentally from the inlet open/ingv 14 lto the outlet opening 15. In accordance with Fig. 3,-one shoot 13 of the` channel '12 is located'intermediate between the end portion of said channel and the out-V p let opening 15; Fig. 4 shows an embodiment in which the last shoot partly registers with the.outlet opening 15 and in which, moreover, the backflow opening 16 has been dispensed with. This is also the ,case in the embodiment illustrated in Fig. 5, in which the channel 12 is subdivided by bridges 17 into a plurality of segmental sections and in which the end sections are in communication with one another through a relatively narrow passage 18.

The described pump functions as follows: Assuming the pump to be completely filled with water and the shaft to be rotating at Ahigh speed, then lthegimpeller will throw the water in an approximately tangential direction into the channel'12. In normal operation, the water i'n said channel flows in substantially7 the samejdirection but at a much lower speed.1 Owing to the excess of speed of the inflowing water, both the speed and .the pressure of the water in the channel 12 peller. Obviously, each shoot 13 will deviate part of the water in van inward direction, whereby the water is returned intoy the impeller and again accellerated, so that' it is again thrown withy full circumferential speed onto the water iowing through channel 12. Thereby, andA also owing to the presence of local strictures that may be provided axially or radially in the channel 12, preferably just beyond the opening of each shoot 13 see Fig. 4), the pressure rapidly increases in the direction of rotation of the impeller, so that the water is forcibly driven to the pressure side of the pum Initially, when the pump begins to suck, both the chamber 4 and the pumping space are y increase `in the direction of motion of the im completely filled with water. If, now, the impeller is d riven at high speed, it forces the water within the pumping space in outward direction. This causes a certain vacuum to set up, but as the pressure increases in the direction of rotation, said vacuum gradually,

decreases..l andafteip-a certain -tirnesan overpressure is set up, so that the a'ir is discharged thru the outlet opening. The spiral line 19 in Fig. 2 approximately indicates the inner circumference of the Vmass of water within the pumping space in this stage of the operation.

As the vacuum in the suction pipeof the pump increases, the pump..requires an increased quantity of water, owing, inter alia,

- to the reduction of the amount/of water within the pumping space. This condition is met by water from chamber 4 flowing back` into the pumpingspace, either through the out?. let opening 15 (Figs. 4 and 5)., or through one or more special return flowv openings 16 (Figs. 1-3) until the water in the suction pipe enters into and fcompletely fills the pumping space.

The same'purpose 1s served by the narrow channel 18 (Fig. 5) connecting the pressure and the suction ends of the channel 12 fand through which a certain quantity of water from the pressure end of the channel 12 is delivered to the suction end of this channel,

depending from the difference of pressure atv both lends.

Y vIt will be understood that the described pump can aswell be used as an air pump or as acompressor. If the pump does not require to draw in air or other gas, the outlet 15 may open into the circumferential channel 12.

The shoots 13 may be more or less, or even exactly radial and may have a variable cross sectional area.

It is preferred to provide the rotary impeller with,fiat, radial blades. A rearward curvature. would tend to reduce theA outlet velocity of the water, whereas a forward curvature would materially increase the internal resistance of the pump.

I wish it to be well understood that the expression pump in this specification and in the claims appended thereto is to be so broadlyconstrued as to also cover-a compressor.

WhatIclaimis:

1. In a rotary pump, a casing enclosing a pumping space having two side walls, an 1mpeller'adapted for rotationwithin said space 'and ttingbetween said sidewalls, a channel space and fitting between said side walls, a

channel formed between the circumferential portion of said impeller and the walls of` said space, an inlet opening in one of said side walls and located within said channel, an outlet opening in the other side wall, and a plurality of shoots of said channel extending A inwardly and forming recessesina side wall Of Said space. 4

3. In a rotary pump, a casing enclosing a pumping space having two side walls, an impeller adapted for rotation within said s ace and fitting between said side walls, a vc annel formed between the circumferential portion of said impeller and thewalls of said space, an inlet opening in one of said-side,

l walls and located within said channel, an outlet opening in the other side wall, and ashoot of said channel extending inwardly and forml ing recesses in both of said side walls. V 4. In' a rotary pump, a casing enclosing a pumping space having two sidewalls, an 1mpeller adapted for rotation within said spacev and fitting between said side walls, a channel formed between the circumferential portion of said impeller and the Walls of said space, an inlet openin lin one of said side walls and located wit in said channel, an outlet opening in the other side wall, and a .plurality of shoots of seid channel each extendees ing inwardly and forming recesses' in bgthf said side walls. s; 5. In a rotary pump, a casin enclosing apumping space 'aving two si e walls, an impeller adapted for rotationwithin said space and fittingl'between said side walls, a channel formed etween the circumferential portion of saidimpeller and the .walls of said space and havlng a variable cross sectional area, an inlet openin in one of said side walls and located withln said channel, an outlet opening in the other side wall, and a shoot of said channel extending inwardly and forming a recess 'in a side wall of said space.

6. In a rotary pump, a casing enclosing a pumpingspace havingtwo side walls, an 1mller adapted for. rotation within said space and fitting betweensaid side walls, a crescentshaped 'channel formed between the circumferential vportion of said impeller and the walls of said space, an inlet opening in oneof said side walls and located within said channel, an outlet o eningin the 4other side wall, and a shoot ,o said channel extending inwardly and forming a recessin a side wall of sads ace. 7. n a rotary Rump, .a casin -enclosing a pumping space aving two si e walls, an impeller adapted for rotation 4within .said space and fittin between said side walls, a channel formedetween the circumferential portion of vsaid impeller space, an inlet openin in one .ofsaid side walls and located wit 'n said channel, 'an

and the walls of said.

outlet o ening in the other side wall, and a shoot ci) said channel extending inwardly 'and forming a recess in a side wall of said space, the said channel being reduced in cross sectional area forward of the axis of said shoot reckoned in the direction ofrotation of said impeller.

8. In a rotary pump, a casing enclosing a pumping space having two side walls, an 1mpeller adapted for rotation within said space and fitting between said side walls, a channel formed between the circumferential portion of said impeller and the walls of said space, an inlet openin in one of said side walls and located wit in said channel, an outlet opening in the other side wall and registering with part of the said channel, and a shoot of said channel extending inwardly and forming a recess in a side Wall of said space.

9. In-a rotary pump, a casing enclosing a pumping space having two side walls, an impeller adapted-for rotation within said space and fitting between said side walls, a channel formed between the circumferentml portion `of said impeller and the walls of said space, an inlet opening in one of said 'side walls and located within said channel an outlet opening in the other side wall, an a shoot of saidchannel extending inwardly and forming a recess in a-s1de wall, said shootregistering withsaid outlet opening. 10. In a rotary. pump, a casing enclosing -a pumping space having two side walls, an

e impeller adapted for rotation within said CTI space and iittin betweenl said side walls, a channel formed etween the circumferential portion of saidimpeller and the walls of said'space, an inlet opening in one of said side walls and located within said channel, an outlet opening in the'other side wall, a shoot of said channel extending inwardly and :forming a recess in a side wall of said space, and a returnliow opening in the side wall which is provided with the said outlet opening. y

11. In a rotary pump, a casin enclosing a pumping space having two si e walls, an impeller adapted for rotation within said space and fitting between said side walls, a sectional channel formed between the circumferential portion of said impeller and the walls of said space, an inlet ope in one of said side walls and located said channel, an outlet openin in the other side wall, and a shoot of sai channel extending inwardly and forming a recess in' a side wall of said space.

12. In a rotary pump, a casing enclosing a pumping space having two side walls; an impeller adapted `for rotation within said space and fitting between said side walls, a segmental channel formed between the circumferential portion of said im eller and the walls of said space the en of said channel being in communication with one 7( formmg a recess 1n a slde wall of said space.

In testimony whereof I aiix m si nature.

i ADOLF BARG B ER.

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