US2315946A - Vacuum condensation pump - Google Patents

Description

Apll', 1943- A. c. DURDIN, JR 2,315,946`

VCUUM CONDENSATION PUMP Filed April 7, 1941 4 'Sheets-Sheet l llllllflllll//llll/ j April 6, 1943.

A. C. DURDIN, JR

VACUUM CONDENSATION PUMP Filed April 7, 1941 4 sheets-sheet 2 A. 'C. DURDIN, JR vacUUM coNDENsgT'IoN PUMP Filed April 7. 1941vl 4' Sheets-Sheet 3 April 6,. 1943 A. c. DURDINQJR 2,315,946

VACUUM CONDENSATION PUMP INVENTOR.

. Patentedl Apr. 6, 1943 asians T" for-Flos vAcUuMcoNnENsArroN Pour Augustus C. Durdin, Jr.,lLincolnwood, Ill'. f Application 'spi-u 7, 1941, serial No. :87.118

14 chime This invention relates to vacuum condensa.-

' tion pumps such as are employed for creating (ci. a-s) vacuum` in the return mains of steam heating systems and for collecting the waterot condensation, vapors. air and non-condensible gasses therefrom and returning the water to the boiler or other desired place.

The invention has particular reference tovthat type of vacuum condensation pump which employs a water pump for discharging the water from a receiving chamber, and a'vacuumpump. which employs water for its operation, for creating vacuum in the receiving chamber and obtaining its hurlingwater from -a hurling water chamber.

One of the objects oi this invention is to provide a valve controlled port between the receiving chamber and the hurling water chamber, controlled by the level of water in the hurling water chamber, to open the port and permit pressure in the two chambers to equalize, whereby to prevent hurling water from leaking too rapidly from the hurling water chamber through Athe pumps and intothe receiving chamber, particularly when the pump is shut down at night and the boiler 1s shut down.

Another object is to provide pressure equalizing means between the receiving chamber andthe hurling water chamber, whereby a sumcient head of hurling water is always maintained for the operation of the vacuum pump. 1 v

Another object is to provide s. valve controlled port between the hurling water chamber and the receiving chamber, controlled by the level of the water in the hurling water chamber, for permitting water to now from the hurling water chamber to the receiving chamber whenever the water in the hurling water chamberrises above a predetermined level.

Another object is to provide a make-up water inletV from the receiving chamber to the vacuum pump, ywhereby to replenish any loss of hurling water. .f

Another object is to provide a. hurling water chamber, separate fromthe receiving chamber, arranged to hold .a supply of hurling water and connected by conduits to the water inlet and discharge of the vacuum pump.

Another object is to provide a receiving'chamber, which has its bottom disposed belowA the outlet to the .water pump, with a make-up water inlet to an air conduit, which conveys the air and non-condensible gasses from thefreceiving chamber to the vacuum pump, which water inlet is always below the surface of the Water in the receiving chamber. and nannte water tothe air conduit after all .of the water has escaped that can be siphoned out through the water outlet by reason of a drop in pressure in the' boiler below that in the receiving chamber.

Another object is to provide a. vacuum condensation pump in the formo! a unit, composed of a minimum number oi' separate parts and capable of being easily and readih' assembled.

With these and -other objects and advantages in view, thisfinvention consists in the several novel features of construction, arrangement and combination of parts hereinatterfully set forth andclalmed. i

The invention isl clearly illustrated in the drawings accompanying this speciilcation, in which:

Fig. l is la central longitudinal vertical section through a vacuum condensation pump, embodying one form of the present invention.

Fig. 2is a horizontal section taken on the line 2-2 of Fig. 1.

Fig. 3'is an enlarged detail vertical longitudinal section taken through fragments or the tank and air conduit.

Fig. 4 is a vertical cross-section taken on the line 4-4 o! Fig.- .1. f

Fig. 5 is a vertical cross-section taken on the line B-S of F18. l.

6-is of Fig l1. s. 7 is an end-elevationofthe tank. ,n

' f Figs. l'and 7. 8 ls a vertical cross-section taken yon the linev 9-8 of Figs. 1 and 10.

Fig.` 10 is a horizontal section taken on the line lli- I0 of Fig. 9.

Fig. 11 is a vertical longitudinal section taken on the line II-II of Fig. 4.

Fig. 12 is an enlarged detail side view of a oat valve, which controls the port between the hurling water chamber and receiving chamber.

Fig. 13 is an end view'of said valve looking in the direction oi the arrow I3 in Fig. 12.

Fig. 14 is anAV enlarged detail vertical section through the shaft couplingbetween the motor shaft and impeller shaft, the line of section being indicated atIl-Il in Fig. 1.

Fig. 15 is a horizontal sectiontaken on the line |5--I5 Of F18. 14.

a horizontal section taken on the line I a horizontal section taken on the line hereinafter described vacuum pump,

I8, and entiv walls I9, Il, The side and end walls project down below the bottom I1 lto provide a hollow base 20, upon is carried.

A vertical partition 2| divides the tank into a receiving chamber 12 and a hurling water chamber 23, which chambers are entirely separate from each other, Ialthough they are connected by a valve controlled port 2l, through which water from thehurling water chamber may dow into the receiving chamber when the waterlevel in the hurling water chamber rises above a predetermined level, and through which air may flow from the hurling water chamber into the receiving chamber whenever the water in the hurling water chamber falls below the said predetermined level. The purposes of the iicat controlled portl which the entire structurel are to. prevent flooding of the hurling water chamber and to equalize the pressure in the two chambers under certain conditions that may '-arise, especially when the pump is shut down.

An inlet passage connects the vreceiving chamber with the inlet opening 2l for the water of condensation, air and other-non-condensible gases which are usually conveyed to the pump by the return mains. and dischargeinto an inlet fitting 2l, bolted or otherwise fastened to a side wall of the tank overthe inlet opening 2C. The inlet passage 2l is formed by two upright crosswalls 29, which extend up from the plane of the bottom wall I1 of the tank and are connected at their upper and lower ends by walls n, e. The walls, which define the inlet passage, Join with water level, and in the dotted lines H3 the position it occupies when the water level falls below the predetermined level. In either of the dotted line positions, one of the fingers i5 engages the ball and unseats it. Ii' the water has risen above the predetermined level, the iloat lever unseats the ball and permits water to ilow from the hurling water chamber to thereceiving discharge conduits are cast as a part of the tank and open out through openings, disposed below the end wall I9* of the tank.

the partition 2| and side wall I8 oi the tank and the partition is formed with an opening 21 therein, which opens from the; receiving chamber to the inlet passage.

The partition 2| extends below the bottom wall I1 as at 2l, and joins with a bottom wall 3|, which forms the bottom of the hurling water Vchamber and joins with the side wall I8 or the tank. From the above, it is apparent that the hurling water chamberis o1' greater depth than the .receiving chamber.

some vapor, wmonoo'oumuiates 1n the receiv- The water inlet conduit I2 is formed by upper I and lower walls 36, 31 and side walls 38, located in the interior of the base and forming an L shaped conduit that The discharge conduit Il is located at a higher level than the inlet condultand .has top, bottom and side walls lo, u, u, that lead from the same end of the base as the conduit- 32, to aconvenient place inl the hurling water chamber and terminate in a hub il ih` which is held the lower end of a vertical water and air discharge pipe M, which extends up part wayin the hurling water chamber vand is provided with a splash plate 45, supported at a place slightly above the discharge end of the pipe. A bracket 4B. which projectsfrom a wall oi the hurling water chamber, and surrounds the discharge' pipe M, forms a lateral support therefor. In the operation of the vacuum pump.

ing chamber, is carried along with the air to the and makeup water is drawn. into the vacuum pump from the receiving chamber and is discharged into the hurling water chamber, where'it accumulates. To prevent the water from-flooding the hurling water chamber or being discharged through the hereinafter mentioned air vent pipe. the port 24 is provided with a float controlled valve which is here shown as comprising a valve seat I Il, naving a nipple threadedly secured in the t'op wall 30 of the inlet passage 2l; a valve Hi, preferably in the form of a ball, seats upon the Yvalve seat and closes the opening therethrough, except when unseated. Fulcrumed upon upstanding ears H2 that rise from the valve seat, is a oat lever ||3 which has a ball oat i4 on Lthe end of one arm, and two fingers lil on its other y arm, which lingers straddle the ball and act to unseat it whenever the float lever is moved up or down from its normal position, which position is controlled by a predetermined level oi the water in the hurling water chamber. The ears ||2 are arranged yon the sides oi the ball and prevent it from escaping from its seat.

Fig. l2 illustrates in solid lines the position in which the iloat lever is held when the water level stands atits predetermined height; in the dotted lines H3* the oat lever is shown in a position occupied when the water reaches a high it draws its hurling water from the hurling water chamber, through the water inlet conduit 32 and discharges it back to the hurling water chamber through the discharge conduit 3l and discharge pipe Il.

The vacuum pump exhaust air and other non- Vcondensible gases from`the receiving chamber,

thereby creating a partial vacuum therein and discharges these gases through the discharge.

pipe Il into-the hurling water chamber, from which they escape Vthrough an air vent pipe I1,

:which has an outwardly opening check valve 4I therein and leads from the top wall of the hurling water chamber. lIt will be understood that the hurling water chamber remains at or above atmospheric pressure, whereas a partial vacuum is maintained in the receiving chamber to facilitate the return-of water and non-condensible gases from the steam heating system with which the pump is used.

An upright air conduit 50 extends from the top to the bottom wall of the'receiving chamber andY is heldin hubs 60, S* formed on said walls and sealed therein. Cast integrally with the bottom wall of the receiving chamber is an air conduit 5|, which opens Vat one end to the Vbottom of the air conduit 50 and communicates with the air inlet of the vacuum pump. As shown. Vthe vair conduit 5I opens at its other end in the same vertical plane as the other hereinbefore mentioned conduits, where it joinswith opens to the hurling water"` chamberl through an opening 39 in the wall 2|` thereof.

.of the receiving chamber.

l 2,815,946- the au inlet to the vacuumpumpas will be nrsupright mmm 1s. which :om 'with s rang' 11 sa ently described. l their upper endsthat forms the support for an Bolted or otherwise rigidly seemed te the top wall voi the receiving chamber over the open -v `upper end of the air conduit Il, is a hollow cap Il, which provides la passageway leading from the upper end of the air'conduit to a port B3 in said top wall, which port opens to the receivl ing chamber, whereby air, vapors, and non-condensible gases may be eihausted from the receivingchamber by the vacuum pump. The cap provides a casing for a check valve I4, desirably ofthe disc type. which is contained in a cage v"..seated in theport i8, andhavinga valve seat for the valve disc which closes an opening 'u ln the cage. other openings s1 in tue wall vof the cageabove the valve disc. together with the opening 5I provide communication between the receiving chamber and air conduit 'when `the valve ls unseated. The cap is formed with a semi-circular bridge 5l, which, together with the bottom face of the cap, bears upon a sealing ring 59 which is seated in an annular groove in the hub 68, and maires a, tight joint between the air conduit,` top wall, and cap. A sealing ring I9' is seated in an annular groove in the hub 9|* and makes a tight Joint between the lower end ofthe air conduit and bottom In the end wall of the receiving chamber and vlocated above vthe bottom wall thereof, is a water wall ; electric pump motor 18. "The pump motor is of the vertical type and its shaft 1l* is coupled to the verticalshaft 84, for the 'impellers of the two pumps, by a novel shaft coupling as will be pres.- ently described.

The vacuum fpump casing is formed with the v usual volute chamber 19, in which is contained the impeller Ill ofthe vacuum pump, andin the pump` casing Vmember 12 is formed the' usual volute chamber 8l yfor the impeller I2 of the water pump. Betweenthe two volute. chambers is acireular.plate .88. which. forms a common wall for'y volute chambers: theedge portion of the plate 1 l seats in' 'grooves formed inthe meeting faces of the pump base and water pump casing member.

shaft 84.

Any suitable vacuum pump, employing water Bothdmpellers are rigidly to the impeller for its operation, may be employed and the one shown and described in .my prior Letters Patent, No. 1,664,249, dated March 27,1928, is 4an example y of such a pump, and reference vmaybe had to said Letters Patent for a full description thereof. Briefly, the vacuum pump casing below theim-l peller is bored asat 98, to receive the lower end make-up water inlet 84 inthev air conduit, through which make-up water for the vacuum pump is drawn into the air conduit and conducted to the vacuum pump. A check ,valve `95, openingv in a direction from the receiving chamber to the air conduit, is connected to' the latter by a short nipple and an orifice nipple 96 is secured in the other open end of the check valve. Suction, created by the vacuum pump, draws water from the receiving chamber at a point below the outlet opening 9|, through the air conduit to the vacuum pump and supplies the latter with make-up water to compensate for any difference in loss.

, Bolted to or cast integrally with the end of the base containing the several conduits, hereinbeiore referred to, is a hollow pump base 61, which as a preference is cast with a pump casing 88 for the vacuum pump Il and with a hurling water inlet 99, a'hurling water outlet 1l, and an air inlet conduit 1I, which are alignedgwith the conduits v82, Il and 5l, and are held in intimate contact of an uprlghtcyllndrlcal wall 81, which separates a centrally located water intakepassage 98 from air intake passages 88. The water intake passage opens to the passageway in the water inlet conduit 98, and an annular inletv passage 92 formed between the casing wall and cylindrical wall conv in the air inlet conduit v'I withl nects the passage the air intake passages 89.

The cylindrical wall 81 extends axially into the interior of theimpeller to the top wall 99 thereof and 'is formed withwater outlet openings 9|,

' through whichhurling waterenters the passages The water suction inlet conduit 62 isV formed with f a bolting ilange at its open end, bolted to the wall I9 ofthe receiving chamber.

' The pump casing member 'l2 is also cast with a water discharge outlet 14, which connects with the pipe connections to the boiler or other place Where the water is to be discharged. Usually, a check valve l5 is contained in said pipe connections. l

Rising from the pump casing member 12, are

between the vanes of the impeller 80. The air intake passages conduct thealr to the passages between the vanes. The openings 8l and air intake passages 89 are vdisposed circumferentially around the cylindrical wall in alternate arrangement. Y 1 1 Y The cylindrical lllrall` 81 seats uponv an annular seat 93, formed ln the bottom member of the vacuum pump casing wall and is held thereon by a bolt 84, which isthreadedly secured in .a boss formed on thebottom wall of the water inlet conduit 88. The cylindrical wall is formed with a spider v95vfor receiving the upper end of the bolt.

The water pump impeller 92 is of conventional type employed in centrifugal 'water pumps, and is formed withfa central eye, which opens from thev water suction conduit 92. y

Both impellers are formed with hubs 80, l2* that surround the impeller shaft. The hub of the water pump impeller bears against a bushing 96, which bears against a shouldered part 91 of the impeller shaft and the .end of Vthev hub of the vacuum pump impeller is beveled and bears against a correspondingly beveled part of the bottom .shroud of the water impeller, and nuts 98, threaded on the lower end ofthe impeller'shaft, serve to secure the impellers togethery and upon the Y impeller shaft. A lsuitable Astuffing box 99 is formed on the pump Vcasing member t3V around the upper end of the impeller shaft.

The shaft coupling 8 5 is of novel construction.

The-motor shaft '18 and impeller shaft 84 are telescoped as shown in Fig. 14, one of them being bored out to receive the end portion of the other shaft and the wall of the bored shaft is formed withseveral slits that extend lengthwise thereof `air vent pipe.

to a predetermined the other shaft. Two circumferential grooves lli are formed in the external faces of the shaft gripping outer faces of which are oppositely tapered. Bearing against the tapered faces of the rings are collars |03, which are formed with tapered inner faces that correspond with the tapers of the tapered faces of the rings. The collars are provided with threaded connection for adjusting them toward and away from each other and as shown, they are formed with interengaging threaded sleeves |04; desirably, the collars1 are formed with hexagonal heads by means of which a wrench may be applied to them for tightening them upon the rings. When tightened up. the beveled faces of the collars crowd the rings againstthe shaft gripping jaws and therewith clamp the same uponthe shaft.

As is well'understood, the usual float and presim sure switches (not shown) are provided for start; ing and stopping the pump motor, but as the construction and operation *of these switchesis well known, no detailed description of them is thought necessary to the understanding of the present invention. Sometimes the water accumulates -to such-an extent that the pumps are required to operate for a longer time 'than is necessary to bring the vacuum down to a normal low pressure. To prevent an excessive low pressure from being created in the system, a .relief valve yor vacuum breaker i" is provided as is customary. In operation under normal conditions vwith the motor running` and the water, air, and nonf condensible gases emptying `inw receiving chamber, the water pump withdraws water from the receiving chamber and pumps -it back to the boiler or other desired place and the vacuum pump builds up a partial vacuum in the receiving chamber and return mains. As has been explained, the vacuum pump receives its hurl. ing water from the hurling water .chamber and discharges it (together with air 'and other non condensible gases which it exhausts from the receiving chamber through the air conduit) into the hurling water chamber, from which the air and non-condensible gases escape through the Some make-up water `for the vacuum pump is withdrawn from the receiving chamber through the water inlet port 04 and passes, along with the air flowing' in the air conduir., to the vacuum pump and is discharged into the hurling water chamber, where it accumulates.

I the water in the hurling water chamber rises above the predetermined level therein, it lifts the float of the float valve, thereby swinging up permitting the excess A ceiving chamber until the level of 'the water in the hurling water chamber falls tothe predetemiined level.

The pumps Vcontinue to Avoperate until the required low pressure is obtained vin the receiving tank, yand the water therein has 4been pumped out float and pressure switches.

When the motor stops and the pumps are at rest, thenwith a partial vacuum in the receiving chamber and atmospheric pressure in the hurling water chamber, water may slowly leak from the hurling water chamber through the vacuum pump past the hub of the vacuum pump impeller into the volute chamber of the water pump'and through the water pump impeller to the suction low level 'as limited by the Jaws, in which are held split rings in, the

Y 2,315,946 to provide shaft gripping Jawa III, that surround.

inlet of the water pump and into the receiving chamber. However, when the level of the water in the hurling water chamber falls below its predetermined level, the float lowers, swings the i'ioat lever down and unseats the valve, per

mittingair from the hurling 4waterlchamber to flow into the receiving chamber until the pressure in both chambers is 'equalized, whereby the leaxage of the water from the hurling water chamber through the pumps to the receiving chamber ceases when the water in both chambers reaches a common level. As a result, a sufficienthead of water is preserved in the hurling water chamber to supply the vacuum pump with water for its operation.

At night, when the boiler is shut down, then in case the pressure therein falls below the low pressure in the receiving chamber, and may tend to syphon water out of the receiving chamber and hurling water chamber, then when the level ofthe water in the hurling water chamber lowers and unseats the float valve, air is admitted from the hurling water chamber to the receiving chamber, thereby equalizing the pressure in both chambers, and if the level of the water lowers to the suction outlet of the water pump, the vacuum will extend to the receiving chamber and hurling water chamber, thereby preventing more water from being syphoned out. As la result, there is always sufficient hurling water left to supply the vacuum pump for its operation when the apparatusv is again started.

More or less variation of the exact 'details of construction is possible without departing from the spiritof this invention; I desire, therefore.

"not to limit myself to the exact form of the construction shown and described, but intend. in

the following claims to point out all of the in- I vention disclosed herein.

I claim as new, and desire to secure by Letters Patent:

the noat lever and unseating the valve,

water to drain into the re the hurling'water chamber and receiving charnber, the iloat of which is contained in the .hur1- ing water chamber and acts to open the valve when moved upwards or downwards from its normal position as governed by a predetermined water level in the hurling water chamber.

2. In a vacuum condensation pump, the combination with a receiving chamber anda hurling water chamber, having a port therebetween, said hurling water chamber opening out to the atmosphere, a water pump and a vacuum pump connected to the receiving chamber, said vacuum pump also having hurling water connections with the hurling water chamber, of a `valve device controlling said port and comprising a valve seat and a float operated valve, the float of said valve being located in the hurling water chamber Aand being adapted to unseat the valve when moved upwards or downwards from a normal position as governed by a predetermined normal levelof the water in the hurling water chamber.

3 In a vacuum condensation pump, the combination with a receiving chamber and alhurling water chamber, having a port therebetween, said asians ing to the base, an aircondult leading from the upper end of the receiving chamber to the air hurling water chamber opening outto the atfmcsphere, a waterpump and a vacuum vpump connected tothe receiving chamber, said vacuum pumpalso having hurling water connections with the hurling water chamber, of a valve device controlling saidcport and comprising a valve seat, a

valve adapted to seat on said valve seat, anda float lever and fioat forpperating the valve, the

iloat being locatedin the hurling water chamber and said oat lever being constructed. and arranged to unseat the valve when moved upwards or downwards from a normal position as governed by a 'predetermined normal level of .the water in the hurling water chamber,

4. In a vacuum condensationpump,thefcombination with a receiving chamber and ahurling water chamber having a port therebetween, said inlet of the vacuum pump, and inlet and discharge conduitsleading from the hurling'water chamber through the hollow of the base to-the v end thereof which supports the pump base, said last mentionedfconduits opening to the water inletvan'd discharge outlet' respectively to the k8*.,Ina. vacuum condensation'v pump, the combination of `a tank having a receiving chamber and al hurling wate'nchamber, a hollow base supporting said tank, said receiving chamber Vhaving a Water discharge opening in one end wall disposed above its bottom, an, air conduit 'leading lfrom the upper end oLthe receiving" chamber, through the hollow of the base. 't0 one hurling vwater chamber opening out to thevatv.

mosphere, a water pump and a vacuum-pump j connected to the receiving chamber, saidvacuum pump also having hurling water connections with the hurling water chamber, of a valve device coni f trolling said port and lcomprising a valve seat, a

ball valveadapted to seat on said valve seat,and anoat lever having a iioat on one arm and a pair of ilngersvon the other arm straddling said' ball ing water chamber and arranged to vunseat the y base bolted to` the, end of `the tank base containing th ends' or said conduits, said pump y base having a water pump, and a vacuum pump valve, said iloat lever being locatedin the" hurl- ,I

ball valve when moved upwards or downwards v from anormal position as governed by apredetermined normal level oi' the water .in lthe l,

hurling water chamber. v

5. A vacuum condensation pump comprising in combination a receiving chamber Aand a hurling .water chamber having a float valve controlled port therebetween, a water pump connected with said receiving chamber, a vacuum pump i emend thereof and said hurling water. chamber havingwater'inlet and discharge conduits leading. therefromthrough the houow of the base to the same end as the air conduit leads, a pump carried thereby,the suction inlet of the water pump opening to thel water discharge opening of .the receiving chamberandthe vacuum pump having an airinle't, opening to the air conduit and water inlet and discharge openings, opening respectively to the said charge conduits. Y n

9. Ina'vacuum condensation pump, the combination of a receiving chamberand a hurling water chamber having a port therebetween, a water pumpfor discharging'v water from thev rewater inlet and disv ceiving chamber, an' air pump ofthe type employing water for its operation, an air conduit leading from the 'upper end of `the receiving chamber to the suction inlet of the vacumn pump, a make-up water inlet, opening to the air conduit at a place below the suction inlet to the water pump, a water inlet conduit leading from the hurling water chamber to the suction inlet of the vacuum pump and a discharge conduit leading from the discharge end oi.' the vacuum pump to the hurling water chamber.

6. In a vacuum condensation pump, the combination of a receiving chamber and a hurling water chamber having a float valve controlled port therebetween of which the oat is contained in the hurlingL water chamber and arranged to open the valve when moved upwards or downwards from a normal position as controlled by a predetermined water level in the hurling 'water` chamber, Water and air pumping means comprising a pump casing, a water pump impeller and a vacuum pump impeller in said casing and both mounted on a vertical motor driven impeller shaft, said casing having a water inlet for the Water impeller connected With said receiving chamber, an air inlet in communica- .tion with the upper end of the receiving chamber and water inlet and discharge openings, respectively in communication with the hurling water chamber.

7. A vacuum pump comprising in combination a tank having a receivingchamber and a hurling tank, a pump base at one end of the tank base. a water pump and' a vacuuml pump associated with said pump base, the water pump having a suction inlet, opening to said receiving chamber and the vacuum pump having an air inlet,

a water inlet, and a discharge outlet, all leadployingwaterior its operation, having an air v inlet, a water inlet, and a discharge outlet, said hurling; water chamberhaving an air 'vent and water chamber, a hollow base supporting said having connections with the water inlet and the discharge outlet of the vacuum pump, an air conduit leading from the upper end of thereceiving chamber to the air inlet of the vacuum pump, a float operated valve for controlling the port between the receiving chamber and hurling water chamber operating toclose said port at a predetermined normal water level in the hurling water chamber and to open said port when the water level rises or falls below said prede-V termined level, whereby water drains from the hurling water chamber to the receiving chamber in a high position of the iloat and the pressure in the hurling water chamber and receiving chamber equalizes in a low position of the float.

10. The combination of a base portion formed with a hurling water dischargeconduit, a receiving chamber and a hurling water chamber arranged side by side carried by said base portion with said inlet and discharge conduits leading :from said hurling water chamber, a -prump base mountedy on said base portion and having a pump casing containing two volute chambers, a Water impeller inone volute chamber and an air impeller in the other volute chamber, a mo-l tor driven shaft on which said impellers arethe vacuumpump is admitted to said vacuum;

pump from the receiving chamber.

l2. A vacuum condensation pump comprising in combination a receiving chamber, a hurling water chamber, which opens out to the atmosphere. a water pump connected to the'receiving chamber for withdrawing water therefrom, a. vacuum pump which employswater for its operation, there being two air ports in the top wall of the receiving chamber, a chambered cap bolted to said top wall over said air ports with said air ports in communication with said chamber. a check valve -in said chamber, opening away from the receiver, an air conduit. leading from the other air port to the air intake of the vacuum pump, and water inlet and discharge conduitsl leading from the hurling water chamber to the water inlet and discharge outlets respectively. of the vacuum pump.` y

13.V A vacuum condensation pump comprising in combination a. base, a tank formed integrally therewith and having a receiving chamber and a hurling water chamber disposed side by side, the latter of which opens out to the atmosphere, water and air pumping means carried by said base and comprising a pump casing disposed at one side o! and bolted to said base. a water pump impeller and a Vvacuum pump impeller therein, a vertical motor driven impeller shaft upon which both of said impellers are mounted,

the upper end of the receiving chamber to said air inlet of the vacuum pump casing, and water inlet land dischargev conduitsl connecting the hurling water chamber with the water inlet and discharge outlets respectively of the vacuum pump.

14. In a'vacuum condensation pumlmthe combination of a base, a tank thereon having a partition dividing' the same into a receiving chamber and a hurling water chamber, cross walls in the hurling water chamber providing a water and air inlet passage from a wall ofthe tank to the receiving chamber, there being a float valvek controlled port in a wall c! said inlet passage of which the float is contained in the hurling water chamber, saidiiloataoting to open the valve when moved upwards orv downwards romy a normal position as governed by a predetermined water level in the hurling water chamber, a water pump and a vacuum pump mounted on said base, the water pump having a suction inlet opening to the receiving chamber through an opening in a wall thereof, and said vacuum pump having an air inlet in communication with the upper end of the receiving chamber, sarid vacuumpump having also a water inlet and a discharge outlet, a water inletrconduit leading from the hurling water chamber to the water inlet of the vacuum pump, a discharge conduit leading from the dischargeoutlet of the vacuum pump and terminating in an upright discharge pipe' in the hurling 'water j chamber.

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