US1215282A - Pump. - Google Patents

Description

w. KIESERQG. PAGEL.

PUMP.' APPLICATION mmlc. 2o.. 1915.

' Patented Feb. 6,1917.

'Im/e2 rizcSr-s-:n 'Walter- Kieser 'Gustav Pa l UNTTED STATES PATENT orFioE.

WALTER KIESER AND GUSTAV' PAGEL, 0F CHARLOTTENBURG, GERMANY, ASSIGNORS TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

PUMP.

Specification of Letters Patent.

Application filed October 20, 1915. Serial No. 56,969.

To all whom yz't may concer/n.'

Be it known that we, WALTER 'K1EsER, a

citizen of the Swiss Republic, and GUsTAv gal pumps of the type having an impeller4 which receives the liquid being pumped at the side and discharges it at the periphery. With such pumps when the supply of liquid being pumped is small and below the capacity of the pump more or less, air is sucked in and discharged with the fluid, since the liquid does not at such times wholly cover the admission opening or eye of the impeller. Although this is unobjectionable in various installations, yet in many cases it is highly objectionable, as, for eX; ample, in pumps used for pumping the water of condensation from condensers, which' water is used as feed water, as the air therein may cause corrosion of the walls of the boilers.

The object of the present. invention is to provide an improved arrangement or structure in a pump of this type'which will prevent at all times air being sucked into the impeller and discharged along with the liquidbeing pumped. l

For a consideration of what we believe to be novel and our invention lattention is directed to the accompanying specicationand the claims appended thereto.

In the' drawing wherein we have illustrated one form which our invention may take, Figure 1 is a sectional view through a pump, and Fig. 2 is a section taken at right angles to Fig. l.

Referring to the drawing, 5 indicates the suction chamber of the pump casing having the 'admission opening 6, and 7 indicates the discharge scroll which terminates in the discharge pipe 8. 9 indicates the pump shaft which extends into the casing through a suitable packing 10 and carries on its end the impeller 11 provided with vanes 12. This impeller may be of any usual or desired structure. It receives the liquid to be pumped at the side and discharges it at the periphery, as is Well understood. The structure so far described is that of an ordinary type of pump. lVhen such a pump is in operation it will be clear that, when the whole admission area of the impeller is not covered with liquid to be pumped, air will be sucked into the impeller. One way to prevent thls, in accordance with our invention, is that illustrated in the drawing in which a wall 13 is provided in the 'suction chamber of the pump which defines passages 14 and 15, and an admission opening- 16 to the impeller, which opening is located at the bottom of the impeller. This wall 13 forms in effect a partition in the suction chamber and projects down so far that air can not'enter the admission opening 16 even atthe lowest level of the Water. In other words, it forms a trap or liquid seal for the inlet side of the impeller. Viewed from adilerent aspect. it may be considered that the chamber formed by the partition member 13 in front of the eye of the impeller is the suction chamber of the pump and that passages 14 and 15 are conduits for directing the liquid through the opening 16 to the impeller.

. In operation the passages 14 and 15 carry the liquid to be pumped down around the impeller and it enters the space in front of the eye of the impeller through opening 16.

Here it is taken by the impeller and dis .that it is vmore economical in the consump' tion of power since the required power will always correspond to the effective output of the pump for the time being. This is due to the fact that the pump is never called upon to pump anything except the liquid intended. i

In accordance with the provisions of the patent statutes, we have described the principle of operation of our invention, together with the apparatus which we' now considerto represent the best embodiment thereof; but we desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

What we claim as new 'and desire to se- Patented Feb-6, 1917. I

cure by Letters Patent of the UnitedStates, 1s:-

1. In a liquid pump, the suction opening of which is atv times only partially supplied With liquid, the combination of a casing, an impeller in the casing, a wall surrounding the eye of the impeller and forming a suction chamber directly in front of it, said .Wall having an opening at its lower portion, and means forming a conduit for supplying fluid to said opening, said conduit extending from a point above the opening down to it whereby the fluid will be supplied to it by gravity and a trap formed to prevent the admission of gases to the impeller. i

2. rlhe combination With a centrifugal pump having a suction chamber, of a partition member in the suction chamber which' surrounds `the eye of the impeller and defines an opening at the lowest point thereof for the admission of the liquid to be pumped to the impeller.

3. The combination of a casing having an inlet, an impeller in the casing, a discharge scroll surrounding it, and a partition member in the casing which surrounds the eye of the impeller and has an opening at its lowest point for admitting liquid to the impeller, said partition member delining a passage for conveying liquid from the inlet to said opening.'

In Witness whereof, We have hereunto set our hands this 23 day of September, 1915.

WALTER KIESER. GUSTAV PAGEL.

Witnesses 4 GEORG FORNER, HERM. HILLS.

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