US1745257A - Pump system - Google Patents

Description

Jan. 2s, 1930.

O. HAENTJENS PUMP SYSTEM 2v Sheets-Sheet 1 Filed Jan. 8, 1927 INVENTOR o -rT a HAENTJENS ATTORN EYS PUMP SYSTEM 2 Sheets-Sheet 2 Filed Jan. 8, 1927 INVENTOR oT-'ro HAEn/TJENS ATTORNEYS atented dan.. 28, 1930 UNITED STATES A E Tj OFFICE PUMP SYSTEM Application led January 8, 1927. Serial No. 159,948.

My invention relates to a pump system, and particularly to a system in which a centrifugal pump is supplemented by means to evacuate the pump casing to effect the priming of the latter. A system of this type is illustrated in my Patent No.1,513,7()5, October During the priming operation there is likely to be a disadvantageous air leakage 1o into the centrifugal casing at the packings of the runner shaft in the side Walls of the pump casing. To prevent this I have heretofore proposed to seal these packings against air leakage by temporarily effective sealing means, such as a Water seal as set forth in my Patent No. 1,599,231, dated September 7, 1926.

In the layout described insaid patent, the evacuation of the centrifugal casing is eHected by means of an auxiliary evacuating pump,

and the sealing Water is applied to the packings by means of an independent Water pump. According to my present invention I utilize but a single unit to eect both the evacuation of the centrifugal pump casing, and also the flow of sealing Water to the shaft packings in the casing Walls. Automatic control of the entire system is also provided for.

4 My invention is more 0r less diagrammatically illustrated in the accompanying draw- Fig. 1 is a side elevation partially in section of a layout which embodies my invention in one form; A

2 is a similar view of a modified construction ;and

Fig. 3 is a diagram of the automatic control circuit.

It will suliice to refer brieiy to the centrifugal pump 15, within the casing of which is a runner 14 mounted on the shaft 16 which passes through the packing glands 17 and 18 and is driven by the electric motor 19 ythrougllx clutch 20.

Opening into the upper portion of the pump casing is a suction line 21 which communicates at its opposite end with a jet exhauster 22. The latter; comprises a venturi 23 and nozzle 24, the latter delivering a stream of Water from reservoir 25 through the V611- turi 23 to tank26 and draughting therewith air from the ejector casing 22 to which suction line 21 opens. The suction thus created Within the ejector casing 22 iscommunicated to the centrifugal 15 and exhausts the latter, thus causing the rise of Water therein from the sump (not shown in a manner readily understood by those s illed in the art.

The tank 26 to which the ejector delivers, is arranged above the level of the packings 17 and 18, and is preferably sub-divided by a Weir 28 into chambers 29 and 30. The water 27 vfrom the` nozzle 24, together with entrained air, is discharged into chamber 29, the water passing over the Weir 28 into chainber30 freed of air bubbles.

To the lower portion of the chamber 30 opens the seal Water line 31, from which the down- comer branches 32 and 33 lead to fun-v lnels 34 and 35 at the glands 17 and 18, and

supply seal water thereto during the priming period. The over-How from the. glands falls into catch basins 36 and 37 formed in the bearing brackets 38 and 39 for the centrifugal runner shaft 16. The catch basins 36 and 37 in turn discharge to a return line 40, which empties into the reservoir 25. A closed circuit for the seal Water is thus provided.

This system presents the advantage over that described in my Patent No. 1,599,231 above mentioned, that the eXhauster unit 22 Which effects the priming of the centrifugal pump serves also as the means for delivering seal Water to the pump shaft packings, and thusobviates the necessity' for the independent seal Water pump heretofore suggested.

I have indicated a small centrifugal pump 41 driven by electric motor 42 as the means for forcing the water from reservoir 25 through jet exhauster nozzle. 24, but this `motorpump unit 41, 42 may be readily sub? stituted by other means-such as an air jet tapped from a pressure line or supplied by an air pump.`

For regulating the flow through the seal water line 31 from the tank 26, I have shown i in Fig. 1 a valve 43 and also drainage pipe 44 leading to reservoir 25 and provided with valve 45.

I also provide, preferably, a priming valve 46 for automatically closing the suction line when the centrifugal pump 15 is under way. This may be of the type shown in my prior Patent No. 1,481,199, January 15, 1924.

When the system is fully automatic along the general lines indicated in my Patent 1,513,705, a float chamber 47 is arranged in the suction line 21, and provided with a floatoperated switch 48 and vacuum breaker 49. The switch is in the control circuit and effects the operation of the main switch which closes the power circuit through the motor 19, while the vacuum breaker opens the suction line after the centrifugal 15 has been fully primed, both as well understood from my patents above mentioned. The drainage line 50 from the float chamber 47 may lead to the reservoir 25, and is provided with a check valve 51 to close this line while the jet exhauster is in operation.

I have above suggested the use of an air jet for supplying water from the reservoir 25 to the jet exhauster nozzle 24. Instead of taking water from the reservoir 25, however, I may utilize a Water jet, when water under suflicient hydrostatic head is available. This is often the case in the delivery line from the centrifugal pump 15, since the delivery line commonly rises, and remains full above a -check valve when the .pump 15 is idle. I may tap this line by a pipe 52 which leads pastV valve 53 to the jet exhauster nozzle 24, as shown in Fig. 2. This valve may be of the automatically closing type, opened by the solenoid S.

When a water pressure line can be tapped 1n this fashion, obviously the reservoir 25 is not needed, and both lines 40 and 50 may drain into a gutter 54.

In order to hasten the drainage of the float chamber 47, I prefer to interpose a check valve 55 between it and the jet exhauster 22. This 1s particularly necessary when using the construction of Fig. 2, since the tank 26 has in that case no opportunity to drain except through the float chamber.

The operation of the fully automatic system will be readily understood from the diagram, Fig. 3. When the sump switch 56 closes the control circuit A, the motor 42 (Fig. 1) or the solenoid S of valve 53 (Fig. 2), or its equivalent, is energized and the jet through the nozzle 24 is started. Sealing water now passes from tank 26 through pipes 31, 32, 33 to the glands 17 and 18. The suction effort of the jet exhausts air from the centrifugal casing 15 and the latter primes from the sump, the sump water being drawn past riming valve 46 into the float chamber 47. en the float rises sufficiently in the latter, it closes the switch 48 in the control circuit C, and the latter energizes the solenoid 57 to close the power switch C S in the power line P of the motor 19. rlhe centrifugal pump is thus set in operation and closes the priming valve 46. The closing of thc switch C S automatically opens the control circuit A at the contactor 58 and thus halts the jet exhauster.

The float also opens the vacuum breaker valve 49 to permit the oat chamber 47 to drain freely through pipe 50. The drainage isintentionallyretarded,however,tomaintain the switch 48 closed until the pressure-operated switch 59 in the shunt 60 is closed for the purpose explained in my patents above l mentioned.

From the foregoing the application of my present invention to a fully automatic system will be readily understood. As is clear, however, from the foregoing description the utility of the invention is not confined to suoli a system. Moreover, it is applicable to systems other than that described in my previous inventions. With the understanding therefore that the drawings and foregoing de scription set forth but illustrative embodiments of my conception, I claim- 1. A pump casing, a shaft having packings therein, a jet exhauster communicating with the pump casing during priming, and means hydraulically connected with the jet exhauster for supplying seal water to the shaft packings.

2. Al centrifugal pump, means for exhausting the saine incident to priming, and means hydraulically connected With said exhauster for sealing the pump packings.

3. A centrifugal pump having shaft packings, means for leading seal water to said packings, and means for exhausting the pump casing and delivering seal water to said first named means.

4. A centrifugal pump having shaft packings, an open gravity feed tank located above said packings, a reservoir below said packings, a hydraulic connection between said tank and reservoir through said shaft packings, and jet means connected to deliver to said tank and to draw from the pump casing during priming. p

5. A centrifugal pump casing havin shaft packings therein, means for provi ing a water seal for such packings during the priming of the casing, a water jet exhauster for the casing, and means for leading the jet water from the exhauster to the water seal means.

6. A centrifugal pump casing having shaft packings therein, means for providing a.

water seal for such packings during the prim-4 ing of the casing, a water jet exhauster for the casing, means for leading the jet water from the exhauster to the water seal means, and means for deaerating the water led from the jet. v

7. A centrifugal pump casing having shaft packings therein, means for providing a water seal for such packings during the priming of thecasing, a water jet exhauster for the casing, means responsive to conditions in the sump and in the pump casing for automatically controlling the operation of the exhauster jet, and means for leading the jet Water from the exhauster to the water seal means.

8. A centrifugal pump casing having shaft packings therein, means for providing a water seal for such packings during the priming of the casing, a Water jet exhauster connected to draw from the casing, a float valve unit in the exhauster connection to the pump casing for controlling the connection in response to liquid level therein, and means for leading the jet `Water from the-exhauster to the Water seal means.

9. A centrifugal pump casing having shaft packings therein, means for providing a Water seal for such packings during the priming of the casing, a Water jet exhauster connected to draw from the casing, a oat valve unit in the exhauster connection to the pump casing, means preventing entry of jet Water into the float chamber, and means for lead ing the jet water from the exhauster to the Water seal means.

10. A centrifugal pump casing having shaft packings therein, means for providing a Water seal for such packings during the priming of the casing, a Water jet exhauster connected to draw from the casing, a float valve unit in the exhauster connection to the pump casing, and means for leading the jet Water from the exhauster to the water seal means, together with a drain to which the Water from the packings and the Water en tering the ioat chamber discharge.

In testimony whereof ll have signed my name to this specification. r

OTTO HAENTJ ENS.

Images