US1581204A - Self-priming centrifugal pump - Google Patents

Description

April 20 1926.

P. HARlVEAU SELF PRIMING GENTRIFUGAL PUMP Filed May 17 1923 PatentedApr. 20,1926. a

m ni. namvnau, orrnnrs, rmen' j SELF-PBIMING ca -me rum. 1

Application filed Kay 17,

pumps. n

The object of.- the present invention is to provide a primingarrangement applicable that the rotor 1 of blades 2 and to a centrifugal pump having 'two inlets that is to say includlng two' pipes through one of which air is sucked up and through the other the liquid to be pumped.

To carry out the priming arrangement of the invention, the pump' having two suction. pipes has one ofthese pi es connected to a suction immersed in the p1t and the other to a priming reservoir filled with water, the said reservoir being also connected on-the other hand to'thedelivery pipe of the pump.

Under these conditions therotor of the pumpv which- .is provided with two blades placed side by side causes by its splashing m the water the priming of the blade on the reservoir side and then the pumping of air.

. 22 the pli1g19 is into the suction pipe, that is to say the priming of the pump 'which is thus produced automatically each time it is set in operation. This invention will now be described with reference to the accompanying drawings, in which I 1 I Fi 1 is a view in elevation of the pump prov ded with the priming arrangement according to the invention, in section on the line AA oiFig. 2, Fig. 2 is a section taken at right angles on the line B-B' of Fig. 1.

Referring'to the figures it will be seen of the pump is rovided with a central imperforate disk having. two series 7 3 covered by cheeks 4-; and 5 and mounted on opposite sides of the disk within separate compartments 3 5, 36'. Thehub ,6 forming the disk between the two series of blades is keyed on the shaft 7 which passes through, the two covers 8 and 9 which carry respectively two suction pipes 110 and 11. The rotor 1 issurrounded by a volute 12 which is terminated by the delivery pipe 13 of the pump. 'The suction pipe 11 is connected with the suction conduit l i which dips into the it 15. The suction pipe ldisconnected wit 1 a reservoir 17, be-

to a T-pipe which connects the delivery 1 opened and t 192a same in. 039,653, 7

' tween which] a diaphragm 16 I is interposed, at the point where 'a seat.18* is ,formedagainst which aclosingplug19 bears. The

.latterlis supported by a lover 20 movable about a shaft 21 and actuated-by a float. 22

connected with the lever 20 by a, pipe 23. .gui'de'd 'on a rod 24.

The discharge pipe 13 of the pump is fixed pipe 26 with the reservoir 17 -whic'h is provided at the pointof .connectionwith a per-- forated boss 27 the lower part of which'is at thesame level as-the' lower part of the shaft7. On' the'side of the-reservoi-rja' priming tap 28'is fixed havin a funnel 12S,'the upper part 30 of which-is aiso at the same level as the point 31 situated at the lower part of'the shaft. M

The working of'the pump according vto this invention is as follows Before the first operation which serves for all further 0 erationthepriming tap 28 is is poured through tlte funnel 29, to attain in the pump the reservoir and the funnel the level 27, 30, 31, 32. The tap 28 is'then closed.

to the level of the float At this moment owing lowered off its seat 18 and the .pum action 0 is started. Under the splashing .the rotor lin thewater a portion j .UNlTE D STATESPATENT-OFFER" e necessary quantity of water of this water is thrown into the volute ,12 f

and escapes through the back. into. the reservoir 17.

.tained inithe lower part of thewheel being thrown towards the periphery produ ces at each of its Iinlet apertures a lngh suction effect which extendsinto each of the suction "pipes'10 and 11. "The suction in the suction pipe, 10 causes the waterto rise fro'm'the reservoir 17 into this pipe'10 so that almost immediatel the series. of blades 2 of the rotor 1 which corresponds with the suction pipe 10, pumps water from the reservoir 17 inorder to throw it back into the same .res-- ervo1r by the dischargejpipe 13and the T- pipe 25., The water spray which is produced in the compartment 35 causes in the compartment36 suction ofa'ir from the suction conduit 14 connected with the suction pipe 11. The water -from the pit -15 rises in the suction pipe lfuntil it reaches the entrance of the wheel .1 into the compartment 36'housing the blade 3 which discharges T-pipe 25 to fall The water 0011-] no the water from the pit into the reservoir 17 Q thus causing the float 22 to rise and at a predetermined .moment the closure plug 19 to abut against the seat 18. From this mo ment the pump which was effectively primed as soon as the water from the suction pipe had reached the blades 3 of the wheel 1'is in a condition to furnish its required pressure and its maximum output into the delivery pipe 26. During the priming the air drawn into the suction pipe 14 and forced into the reservoirl'? is. discharged through the exit assin throu h the pi e 33 are highest piirt of tie reser- 34 as above this level water would return tothe pit by siphonic action. At this maximum level the plug 19 is at a suitable distance from its seat 18. If any stuffing box during a long period of inactivity of the pump allows water to escape, the latter falls toa level which can not be lower than the level 27, 30, 31, 32, that is to say the level which'is necessary and suflicient to enable the apparatus to work properly.

When the pump draws Water from a well it may happen that the quantity of water drawn up by the pump in a given time is greater than the quantity of water furnished by the source which feeds the well and in due course the lower end of the pipe 14 will be uncovered by the Water. The pump will then suck-in air thus placing itself automatically in a priming position. As soon, however, as the level of the water in the well has risen and covers the lower end of the pipe 14- the pump continuing to suck air will produce a depression .which will cause the water again-to rise in the pipe 14 and the pump will be automatically re-primed.

When the pump is primed and working normally the valve 19 is pressed on its seat and the left hand blades 2.become inoperative. As a special utilization of this pump open to the atmosphere whilst the bladesl draw water and delivering the mixture of water and air into a closed reservolr. The wateris then under pressure in consequence of the compressed air above it and water ma thus be delivered under pressure.

n both cases the blades 3 of the wheel 1' pump up water and the blades 2 of the Wheel 1 pump in air. 7

' pumps for flui casing, a rotor In'the first case the mixture of air and water is forced to the outside at atmospheric pressure.

In the second case the mixture of air and water is forced under pressure into the reservoir utilized for ensuring the distribution of water under pressure by compressed air.

The means which have been found most suitable for carrying out the priming arrangement according to the invention have been described but itis of course evident' that the invention is not limited to the exact details of construction and that others fulfilling the. same functions may be substituted therefor.

I declare that What I claim is 1. In a priming device for centrifugal pumps for fluids the combination of a pump casing, a rotor mounted within said casing, a pair of inlet pipes, means to connect one of said inlet pipes to the supply fluid, a priming reservoir, means to connect the other of said inlet pipes with said priming reservoir, a valve on said pipe between said priming reservoir and said inlet pipe and means to control automatically, the flow of fluid between said priming reservoir and said inlet pipe. 7

2. In a primin device for centrifugal pumps for fluids t eicombination of a pump casing, a rotor'mounted within said casing,

a pair of inlet pipes, means to connect one i priming reservoir and said inlet pipe and a' oat in said reservoir'adapted to control automatically the osition of said valve when the liquid therein has reached a predeter mined level.

3. In apriming. device for centrifugal a pair of inlet pipes, means to connect one he combination of a pump f ounted within said casing,

of said inlet pipes to the supply fluid, a

priming reservoir, means to connect the other of said inlet pipes with s'ald'priming reservoir, a valve on said pipe between said priming reservoir and said inlet pipe, a float in said reservoir adapted .to cbntrol automatically the position of said valve when the liquid therein has reached a predetermined level, a delivery pipe and means to connect said priming reservoir with said delivery pipe.

4. In a primim device for centrifugal pumps for fluids the combination of a pump casing, a rotor mounted within said casing, a pair of inlet pipes connected with said casing, a priming reservoir, means to connect one of said pipes with said priming ress ervoir, means to control automatically the flow of l quid through said connection, and

connecting means'between said other inlet pipe and the liquid to be pumped including a swan neck connection, in order to cause the I water withinthe pump to take up a predep p termined level.

5. In a centrifugal pump havin a casing and a rotor therein with an imper orate central disk and impeller blades on bothsides of said disk, an inlet pipe to lead the supply fluid to one side ofsaid rotor disk, a priming reservoir, a second pipe leadingv from said reservoir to the other side of said rotor disk, a delivery pipe leading from said casing, and a by pass pipe from said delivery 1 e to said reservoir, whereb one side of said disk and its impeller b ades acts to 16 maintain the priming of the ump and the other side and its impeller lades acts to pump the supply fluid. V

In witness whereof, I have hereunto signed my name this 28 day of March 1923.

PAUL HARIVEAU

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