US 1883634 A
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Description (OCR text may contain errors)
L. F. EASTON DUAL vPURPOSE PUMPING APPARATUS Oct. 18 1932.
4 Sheets-Sheet Filed Feb. 7', 1930 Oct. .1 8, 1932.
L. F. EASTON DUAL PURPOSE yPUMPING APPARATUS 4 Sheets-Sheet 2 Filed Feb. 7. 1930 fil/1l Oct. 18, 1932. L. F. EASTON 1,883,634
DUAL rUnPosE PUMPING APPARATUS Filed Feb. '7. 195o 4 sheets-sheet 3 Oct. 18, 1932. .V F. EASTON 1,883,634 y,
DUAL PURPOSE PUMPING APPARATUS Filed Feb. '7. 1950 4 Sheets-Sheet 4 en ne. enessn Wrseensnr Pennine Menuiserie .fn piicetien filed ehruary il, lt). derlei No. ddll rl`his inventien relates te improvements in dual purpose pumping apperetus. I
The puriping upperatus of the present in` vention is designed primarily for use in eziberusting1 nir and Water oi condensation from a vacuum. steam heating system, elthou h it is applicuhle for use under other een itions 'in which mechanism must loe provided for alternately hundlingg1 liquids und gases.
The mechanism et the present invention employs a rotary pump havin@ blades so designed es te operete eii'icientlly in the discharge 0i gas when rotating in one direction, v und in the discherge el liquid retating w in the opposite directien,
ln' conformity with the design et the roter, provision is mede for reversing the direction of the motor drive in accordance with conditions. estelolished Within the system with Which the pump is asseciated, so that when an accumulation ei' duid in the system necessitatcs the operation of the pump as s centrifugal liquid pump, the 'meter will be switched on to rotate the pum in the corresponding direction until the discharge of liquid has continued te a point which necessitates the use of the pump es a vacuum pump, et `which time the motor will he automatically switched or. te rotate the pump in the opposite direction 3 during the interval when the pump is acting as a vacuum pumpn `With these ends in view, provision is mede for the actuation et e specially designed r switch by means of e float which is responsive to the rise and fall of liquid in the system, so that the ultimate control of the pump will be determined by the accumulation of liquid within the system. ln this Way it is possible in each instance to rotate the pump in the direction which secures the greatest efficiency in. operation commensurate with the design of the rotor blades.
The pump is especially designed `tor use in connection with a vacuum steam heating1 system, although it is equally adaptable in use for other purposes, but in order to clearly i1- lustrate the principles of operation, reference will be had in the drawings and description 50 to so much of e. vacuum steam heating system es is requisite te e full understendingI el? the nature of the invention.,
For purposes ci? convenience, it will be essumed that air end erster are the i'iuids being handled bythe pump, although it will he understood, of course, inthe use et. the terms air and Weter l have in contemplation the handling of otheri'luids under -enelogous circumstances..
Further details of the invention -will eppear from a description theieeiz, in cenjunction with the accompanyingdrevrings, Wherein the apparatus as a whole is illustrated mere or less diagra i t 1 sticelly, and vrhereinf Figure l is e side elevetion et principe features of the apparatus involved the present invention;
Fig. 2 is n sectional elevation of the pump, showing the rotor and casing;
Fig. 3 is a View partly in section eil the Heat-tank and the switch mechanism involved in the energizing and cle-energizing et the motor;
Fig. d is a sectional elevation oi" the pump, shonung the pumpin use es e. centrifugal err or vacuum pump;
Fig. 5 is a sectienel View teken right angles to Fig. d;
Fig. 6 is a plan vievnot the switch rneehs= nisrn; and
Fi 7 is a diavram of the Wiring, meter, switc and associated pnrts.
The pump, as best illustrated in ligrs, 2, i and 5, comprises an outer shell l0 ei orizontally elonwated formation, as illustrated, which comprises a body portion 1l end e removable head l2.
The sidewall 13 of the body portion is out Wardly bulged, as shown in Flg. 5, end the head 12 is similarly bulged and provided around its periphery with a Hangs ld,and secured to a shoulder 15 of the Well of the body portion by means of headed screws i6.
The body portion of the shell is provided with a curving outer end Wall 17', u lat base 18, an inner flat end Wall 19, and e top well 20. The configuration of the shell, however, may he varied, or its position' otherwise` arranged or inverted Without departing from the spirit of the invention.
26, and so that they will tit snugly into a recess in the head 12, where they are secured by screws 27 in such a manner that the rotor and rotor casing will be in true central alignment with the head 12 and its bearing for the shaft.
heside wall 23 of the cup-shaped body 'of the rotor casing'is outwardly extended at its center to furnish a bearing 28 which may be reinforced by radially extending ribs 29, and the bearing recess receives the end of a rotor shaft 30, which passes through a journal boss 31 formed in the center of the side plate and also through a bearing sleeve 32 outwardly projecting from the head 12 and provided with a 'gland 33 which is adapted to compress a packing 34 to seal the bearing. v l
The shaft carries a rotor comprisinga hub 35 from which extend a plurality ot curving blades 36. The blades all curve uniormly in the same direction, and the side edges of the blades lie in close relation to the opposite sides ofthe rotor casing, a workf ing clearance only being alorded.
The tips or' the blades stand in spaced relationrto lthe curved peripheral wall 24 of the rotor casing, save on the `inner side where the wall is formed of a curvature of less radius to brin the wall surface into close proximity to t e ti s of the blades, inorder to afford a block-o wall 37.
immediately adjacent to each end of the block-oil wall, the rotor casing is provided with an outwardly extending tangentially disposed nipple 38 and 39 respectively, into which are entered tapering Venturitubes 40 and 41 respectively. l
`In order to provide for the escape of air from the rotor chamber, each of the side walls is rovided with an arcuately formed air disc arge port 42, the inner edge of which aligns with the adjacent periphery of the hub, and each of the air discharge ports is so disposed as to bring its inner end in substantially radial alignment with the mouth of the adjacent nipple.
immediately adjacent to the lower nipple 39 is located a small port 43 which serves to provide for the indow ot water from the outer chamber into the rotor chamber at a point adjacent to the inner terminus ot the tube 40. Air discharged through the ports 42 into the outer chamber is educted through an air discharge pipe 44.
ln order to more fully understand the method of pump control involved in the present invention, 1t is desirable at this point to pump itself, both when operating as a vacuum pump and when operating as a centrifugal` water pump.
It has been shown by demonstration that with the use oi curved rotary blades of the character indicated the rotor is enabled to operate eciently as a centrifugal water pump, when the rotor is rotating 1n a direction counter to the curvature of the blades, which would be clockwise in Figs. 2 and 4, and also to operate eciently as a vacuum pump when the direction of rotation is reversed yto present the blades in a forwardly curving direction.
lin lEi 4, which illustrates the pump conditione to operate as a vacuum ump, the lower tube 40 will constitute an in et for the air, and the upper tube 41 will be closed to prevent the escape of the water ring required in the operation ot the pump as a vacuum pump. Underthese conditions, with the ro-a tor turning in an anti-clockwise direction, air will be drawn into the rotor chamber at a point immediately below the lower end of the block-oli wall 37. At this point, the water ring is suddenly released from the confinement occasioned by the block-od' wall and flies outwardly into Contact with the more extended circular wall surrounding the remainder of the rotor chamber.
With the water thus agitated by its sudden release, the air admitted through the tube 40 lwill be drawn inwardly and through the water ring and into the pockets aiorded between the rotor blades, and charges of air will thus be carried around until they 'reach the Outlet port 42 which is located at a point adjacent to the upper end of the block-oft wall, at which point the water ring is suddenly driven inwardly, which expels the pocketed air through the ports 42 into'the outer chamber on each side of the rotor casing, and the air is thence driven upwardly and discharged through the pipe 44.
When the pump is operating as a centrifugal water pump, the water will be admitted through the upper tube 41 and discharged through the lower tube 40, and these conditions will continue until the desired volume of water has been discharged, after which the pump will be re-conditioned to operatel as a vacuum pump and its direction of rotation reversed and the passage through the tube 41 closed'by automatic means which will now be described in detail.
escasas drawings. Joining the pipe line d6 is a branch 46 leading to theouter chamber of the pump, with a check valve 46 interposed in such a manner that liquid may be drawn into the outer chamber.
rlhe pipe line 46 is provided with a check valve 48 near its lower end, which check valve constitutes a closure against the discharge of water through the pipe line 41-46 when the pump is operatin as a` vacuum pump. T he lower tube 1s aligned with and communicates with a. pipe line t9 provided with a check valve 50, which pi e line may lead to the boiler or other point or the discharge of the water.
The header extends upwardly and connects with a vacuum pipe line 5l which, as shown, is connected at its upper end to a vacuum tank 52. A. return line from the radiator system is indicated at 53, which return line discharges into the to oiz the lioat chamber through the pipe section 54.
il, vacuum tube controlled by a thermostatic valve 56 connects the vacuum tank with the return line 53 in the particularembodiment of the invention herein shown, and a vacuum switch 57 connected with the vacuum tanlr through a pipe or tube 58 serves to cut od power from the motor when the vacuum has reached a predetermined degree.
rlihe water inlet pipe line lll- 46 enters the base of the float chamber t7, which is divided by a wall 59 to afiord a lower or base chamber 60. rlihe wall 59, on its far side, is separated from the wall or the doat chamber and upturned to afford a wier 6l between which vand the adjacent wall is a passage 62, while near the base of the wier is a restricted water discharge port 62S.
d bucket float 63 operates'witbin the space v within the wier, and the bucket doet has pivoted thereto an arm 6d which connects with a rock shaft 65 which carries a counterweight 65 and an arm 66 terminatin in two pairs ot curvedly dlverging prongs 6)?, each pair constituting a. yoke 68 tor the operation of the switch now to he described.
The rock shaft 65 is mounted within a U- shaped trame comprising upstanding1 arms 69' and a connecting cross plate 70,.which, as shown, is supported upon a bracket 7l outstandingJ `from the wall of the float chamber.
Above the rock shaft 65 and in parallel relation therewith is located a pair of inwardly extending separated stub shafts '72 in aligned relation, the outer ends of which are rigidly secured within the upstanding arms 69 of the U-shaped frame. Each of the stub shafts 72 has journalled thereon a sleeve 73, the inner end of which carries an arm 7d which mounts a weight 7 5. The two weighted arms are ot the same configuration but are' operable independently of one another by means o inwardly extending pins 76 which ride upon the edges of the yoke arms 68.
ments occasioned by the respective arms will occur in succession rather than simultaneously. Each of the sleeves 73 carries at its inner end a cross arm 77 comprising oppositely est-ending fingers 78.
The upper ends of the upstanding arms 69 of the lll-shaped frame carry switch plates 79-7 9 preferably formed of insulating` mamounted thereon three switch bars 80, 81 and 82, respectively arranged in parallel relation and each pivoted somewhat otf center on a pivot pin 83, which pivot pins also constitute terminals fior the circuits presently to be described.
Each group of three switch bars coacts with a group or three terminals 84 disposed in parallel alignment with the pivot terminals 83, so that when a group of switch bars is swung, as a unit, from the position indicated at the upper side-of Fig. 6, to the dotted line position at the upper side of the same figure, the circuits will be closed through the contacts.
Each group of switch bars is pivoted to a slide bar 85 provided with a lug 86 adapted to be engaged by the lingers 78 of the contiguous cross arm 77; that is to say, as the weighted arm swings past the vertical -medial position indicated in Fig. 3, and then falls downwardly toward its reverse position, the previously lowered linger 7 8 will ultimately be moved sui'iciently to engage the lug 86 and shift the slide bar 85 during the final movement ot the weighted arm. Upon a reversal of the movement-of the weighted arm, the o posits Enger 'i' 8 will ultimately restore the slide bar with the group of switch arms to theinitial position.
'lhese movements of the reversal of the switches are utilized for the purpose of reversing-the'operation ot the motor, which rotates the pump and which is diagrammatically illustratedat 87 in Fig. 7. The illustraterial, and each of the switch plates has 35* tion and following description serve merely v to indicate the principle of operation involved, since the specific construction of the motor forms no part of the present invention, and any type of motor may be employed which can ,be reversed in direction through the operation of suitably arranged switches.
As shown, a circuit can be established through one of the groups oswitches between the corresponding group of pivot con`\ rection. Current is sup lied through line wires 89 controlled by switches 90 which are actuated by a diaphragm 91, which constitutes the active element of the vacuum switch, so that the line wires can be switched on when the vacuum reaches a predetermined degree,
' Operation Where the apparatus is used in connection with a vacuum steam heating system, water oi condensation delivered through the return line ot the system willkaccumulate in the float chamber until the water level has risen suthciently to litt the bucket Heat, which being counterwcighted will rise and fall with the water level. As the fioat rises, due to an accumulation of water, it will litt the arm 6d and impart a swinging movement to the arm l 2g/66 carrying the yokes 68.
The swinging movement of the companion yokes will lift the weighted arms 7d, one slightly in advance ot the other, until lthe float has risen suihciently to bring the weighted arms successivel past the medial point, which will cause a ropping of the arms and a reversal of the switch elements. This will actuate the motor in the proper direction to rotate the rotor shaft to cause the rotor to act as a centrifugal water pump, which will serve to draw in water through the water line ifi-i1 past the check valve 48, so that the s pump will begin the discharge of water from the float chamberthrough the pipe 49 and the check valve to the boiler or other point of delivery. This will lower the water level in the float chamber, and the float will begin to descend, which results in a reverse move? ment of the switch actuating yokes, but the switches will not be actuatedl until the water level has been lowered sufficiently to bring the weighted arms .in each case beyond the medial point, afterwhich the arms will fall in reverse direction and actuate the switches to cause a reversal of the motor and the operation of the pump as a vacuum pump.
While the pump is operating as a vacuum pump, the outdow of water throufrh the water line L11-46 will be prevented by the action of the check valve d8, so that the proper quantity of water will be retained within the rotor chamber to enable the rotor to act etectively as a vacuum pump and discharge the air through-the ports 42 and through the i3 air discharge pipe 4A which is provided with a check valve 44d to permit discharge of air. The air will be admitted from the system through the pipe line 51, vacuum tank 52, and vacuum tube which communicates 375 with the return line 53, and the rotor will neeaeea continue to operate as a vacuum pump until to operate the Vacuum switch 57 which shuts ed the motor, and the vacuum is maintained temporarily within the system b the provision of a check valve 51a in t e vacuum line 51. x
'.ln` course o time, water of condensation will vaccumulate in the float chamber sufiiciently to elevate the float to the degree required to actuate the switch mechanism, and the rotor will then begin to rotate in the proper direction to again discharge water of condensation.
The weiglited switch operating arms are so arranged that after one has broken the circuits the other does not act until the motor has stopped, but if the motor is so constructed as to be reversed wit-hout first being stopped, this successive actuation is not necessary.
When, however, the successive arrangement is employed, it is necessary to so mount the float that it will continue to fall after the pump stops pumping water. This is accomplished by the provision ofthe weir which adords restricted communication between he upper and lower chambers in the float tank. I Y
When the water level has dropped suci` ently to lower the Jfloat below the surface' of the Weir, it will be buoyed only by the l b d alithY of water trapped behind the weir, and'-r is point will descend slowly as the watery behind the weir is discharged through the.
restricted aperture 62B.
Thls ultimate grad- "y,
ual descent of the Heat finally causes the second weighted arm to fall and start the motor in the direction to operate the rotor pump until stopped by the vacuum switch.
Tt will be understood that the float and switch mechanism are so arranged that the first of the' weighted arms will fall at pro er time to stop the motor, and that the falling Auit of the second arm will be delayed or retarded E by the ultimate gradual descent of the ioat. The travel of each of the weighted arms is about 210, or 105 on each side of the upper medial point. 1f five degrees of travel is allowed past the medial point before the weightedl arm drops, and seventy degrees for travel after the finger 78 implnges on the projecting lug of the switch slide bar, it is apparent that there is stored up energy during 70 of falling movement in addition to the actual dead weight of the arms themselves, which energy 1s relied upon toactuate the switches. i
The switch contacts are so placed with reference to each other, as well as to the float,
that the irst weighted arm moves its switches to break the circuit, and the last 'all'moves the other switches into contact to close the each case the edge of the arm that impinges upon the switch lug extends radially through themotor, after being temporaril stopped, will start the pumping of water. he pum ina' of gas at the proper time will be esta lis ed automaticall The cross arms 7 are so arranged that in the pivot of the weighted arm, and this edge extends exactly atright angles to the weighted arm.
.Although the weighted arm and associated parts are here shown as used to actiiato switches for'the reversal of a motor, the same mechanism might be advantageously used to control mechanism other than electric lswitches for reversing the direction of rotation of the rotor, and it is not the intention to`limit the present ,invention to the use of a reversing motor, since other adequate means for-accomplishing the same result may be employed without departing from the spirit of the invention. ,Y
Furthermore, the use of the control mechanism herein described may be employed for theoperation of valves or the like which serve to regulate the inflow and outflow of gases or liquids inL such a way as to enable the rotor to operate eiectively in the discharge either of gases or liquids, as occasionv may require. In this case the motor might not be reversed, and the operation would be similar to that in my'copending application,
Serial No. 425,087, filed February 1, 1930. In such copending application the valves shown and described are of a class rwhere the operation of thevalve is through a lever handle. If, therefore, lug 86 be considered as attached to the operating end of such lever handle, it is evident that the valve will be opened or closed alternately by the impinging linger 78, thereby operating valves instead of switches in an abrupt and positive manner instead of gradually as shown and described in such copending application. Such a substitution of valves for switches is a mere matter of mechanical detail', and which, while applicant has actually tried it out satisfactorily, requires no further description.
Although as a matter of convenience and simplicity in the drawings, the pump has been shown mounted upon the float chamher, this is not only not necessary but may be undesirable, particularly if curvature of the blades is such as to produce little if any suction when water should be pumped.
The pump may therefore be located at a lower level and in any desirable location with i through the check valve 46b may also be used as a suction supplyto the pump, either alone or as an adjunctLtof the Venturi tube 41.
ether one or both are used depend upon the liquid pumping requirements.
Other modications in structure and arrangement may be introduced without departing from the spirit of the invention.
s 1. In apparatus of the class described, the combination of a rotary pump designed to operate as an air pump when rotating in one direction and as a water pump when rotating in the opiosite direction, means for admitting air an water to the pump, and means responsive to variations in the quantity of water supplied for eiecting rotation of the pump in the desired direction.
2. In apparatus of the class described, the combination of a rotary ump configured to operate as an air pump w en rotating in one direction and as a water pump when rotating in the opposite direction, means for admitting air and water to the pump, and means vresponsive to variation in the level of the water supplied to the pump for actuating the pump in the desired direction.
3. In apparatus of the class described, the combination of a rotary ump congured to operate as an air pump w en rotatin in one direction and as a water pump w en rotating in the opmsite direction, means for admitting air an water to the pump, a fioat chamber with vwhich the water supply line is connected, a float within the chamber, and means controlled by the rise and fall ofthe oat for rotating the pump in the desired direction.
4. In apparatus of the class described, the combination of a rotary pump designed to operate as an air pump when rotating in one direction and as a water pump when rotating in the opposite direction, meansfor admitting air and water to the pump, a oat chamber with which the water supply line is connected, a float within the chamber, a motor adapted to operate in either direction, and switch mechanism actuated by the rise and fall of the ioat for controlling the n peration of the motor in the desired direcion.
5. In apparatus of the class described, the combination of a rotary pump designed to operate as an' air pump when rot-ating in one direction and as a water pump when rotating in the opposite direction, means for admitting air and water to the pum a float chamber with which the water sup y line is connected, a float within the cham er, a motor adapted to rotate the pump in either direction, switch mechanism and electrical connections for energizing the motor to operate in the desired direction, and a switch control ate the switch mechanism.
6. In apparatus of the class described, the combination of av rotary pump configured to operate as an air pump when rotating in one direction and as a water pump when rotating in the opposite direction, means for admitting air and water to the pump, a ioat chamber with which the water supply line is connected, afloat within the chamber a ymotor adapted to rotate the pump in either direction, two sets of switches and circuits adapted respectively to rotate the motor in each of two directions, companion switch operating devices, each operatively connected to the float and adapted to actuate the associated switch in conformity with variations in the rise and fall of the iioat.
7. In apparatus of the class described, the.
combination of a rotary ump configured to o erate as an air pump w en rotating in one direction and as a water lump when rotating in the opposite direction, means for admitting air and water to the pump, a float chamber with which the water suppl line is connected a float within the chamber, a
'motor ladapted to rotate the pump in either direction, two sets of switches and circuits adapted respectively to rotate theV motor in each of two directions, companion switch operating devices, each adapted to be moved f to a medial point and thereafter to automatically move forward to the switch operating position, and means operatively connected with the float for conjointly actuating the two switch operating devices in the desired timed relation to one another.
8. In apparatus of the class described, the combination of a rotary pump configured to operate as an air pump when rotating in one direction and as a water pump when rotating in the opposite direction, means for admitting air and water to the pump, a ioat vchamber with which the water supply line is connected, a float within the chamber, a motor adapted to rotate the pump in each of two directions, two circuit lines and two switches for optionall rotating the motor in either of two directions, companion switch operating arms each ivote in proximity -to the associated switc and each adapted to be lswung upwardlv to a'medalv position and thereafter to fall to the switch operating 'pnsiton, an operating yoke provided with f'gers adapted to engage and swin the switch position,
operating arms to a point beyon the medial and connections between thel float andthe operating yoke for swinging the same rise and fall of water inthe oat chamber.
9. In apparatus of the class described, the combination of a rotary pump configured to operate as anv air pump when rotating in one direction and as a water pump when'rotating in the opposite direction, means for admittingl air an water to the pump, a float chamber with which the water supply line is in either direction iny conformity with. thel aesaese.
connected, a fioat within the chamber, a motor adapted to rotate the pump in each of two directions, two circuit lines and two switches for optionally rotating the motor in either of two directions, companion switch operating arms, each pivoted in proximity to the associated switch and each adapted tobe swung upwardly to a medial position and thereafter to fall to theiswitch operating position, an operating yoke provided with ngers adapted to engage and swing the switch operating arms to a point'beyond the edial position, and connections between the.
and adapted to operate as a water pump when rotating in a direction to present the blades rearwardl passages for admitting air and water to t e casing, an air discharge passage in communication with the casing, means for closing the water inlet passage against the escape of water when the pump is operating as an air pump, and fmeans responsive to variations 1n the amo t of water supplied to the pump for varyin the direction of rotation of the pump.
11. In apparatus of the class described, the
combination of a rotor casing rovided withv an inwardly projecting block-o wall, a rotor within the casing having blades adapted to i operate as an air pum when rotating ina direction'to present the lades forwardly, and
adapted to operate as a waterY pump when rotating in a 'direction to present the blades rearwardly, passages for admitting air and water to the casing, an air discharge passage in communication with the casing, means for closing the water, inlet passage against the escape of water when the pump is operating as an air pump, means for supplying rotative power to the either direction, and means responsive to variations in the levelgof water supplied to the pump for controlling the direction of rotation, said means including a iioa-t chamber, a
float within the chamber, and connections be-- tween said iioat and said controllin means.
12. In apparatus of the class described, the .combination of a pump including a casing provided with a block-ofi' wall, a rotor mounted within the casing and having curving blades adapted to operate as an air pump when the rotor rotates in a direction to resent the blades forwardly, and adapte -to pump for rotating the samein jected to vacuum, and connections betweenv resaca@ operate as a water pump when the rotor rotates in a direction to present the blades rearwardy, air and water supply passages leading into the pump casing at opposite ends of the block-ott` wall, the pump casing being provided with a laterally opening air discharge port, an air discharge passage in communication with said port, a receptacle adapted to receive water discharged thereinto and having the water supply passage connected therewith, means for rotating the pump in either of two directions, and controlling means responsive to the risc and fall of water within said receptacle for actuating said pump rotating means in the desired direction.
13. In apparatus of the class described, the combination of a pump including a casing provided with a block-olf wall, a rotor mounted within the casing and having curving blades adapted to operate as an air pump when the rotor rotates in a direction to present the blades forwardly, and adapted to operate as a water pump when the rotor rotates in a direction to present the blades rearwardly, air and water supply passages leading into the punlp casing at opposite ends ofthe blockof wall. thepump casing'being provided with a laterally opening air discharge port, an air discharge passage in communication with said port, a receptacle adapted to receive water discharged thercinto and having the water supply passage connected therewith, means for rotating the pump in either of two directions, and controlling means responsive to the rise and fall of water within said receptacle for actuating said pump rotating means in the desired direction, a vacuum tank with .which the air supply passage is connected, a connection between the vacuum tank and the supply line for the water receiving receptacle, a thermostatic valve for controlling the last named connection, a Vacuum switch in communication with a portion of the system subsaid vacuum switch and the means for rotating the rotor for stopping the operation of the rotor when a predetermined degree of vacuum has been secured,
14. In apparatus of the class described, the combination of a. rotor casing provided with a block-ofi wall, a rotor within the casin g having curvingblades adapted to operate when the rotor is rotated in a direction to present the blades forwardly and adapted to operate as a water pump when the rotor is rotated in a direction to preesnt the blades rearwardly, air and water inlet passages entering the pump casing at oppositeends of the bloeleotf wall, a water discharge passage in communication with the air inlet passage, the latter being adapted on occasion te serve as a water discharge passage, a vacuum tank in communication With the air inlet passage, a water receiving receptacle, and a Water supply line leading thereinto, a thermostatically controlled connection between the vacuum tank and. the water suppl line, a vacuum switch in communication wlth a portion of the system subjected to vacuum, means for operating the rotor in either of two directions, and
control mechanism actuated by the rise andA fall of water in the water receiving receptacle for determining the direction of rotation of the rotor, and connections between the vacuum switch and the rotor operating means for starting and stopping the latter in conformity with vacuum conditions.
15. In apparatus ot the class described, the combination of a pump designed to operate as an air pump under one set of operating conditions and to operate 'as a Water pump under another'` set of o erating conditions, air and water supply lines leading to said pump, and means controlled by variations in the pressure status ot fluids supplied for establishing the desired set of operating conditionsvfor the pump.
16. In apparatus of the class described, the' combination of a pump designed to operate as an air pump under one set of operating conditions and to operate as a water pump under another set of operating conditions, air and water supply lines leading to said pump, and means responsive to variations in the volume of water delivered for establishing the operating conditions for the pump.
1.7. In apparatus of the class described, the combination of a pump adapted to operate as a water pump .under one set of operating conditions and to operate as an air pump under another set of operating conditions, means for operating the pump, means for supplying air and water to the pump, and means responsive to variations in the accumulation of water in the water supply means for controlling the operation of the pump opcrating means to operate the pump'either as a water pump or as an air pump.
18. In apparatus of the class described, the combination ofa pump adapted to operate as a water pump when water accumulates to a predetermined Volume and as an air pump where there is a deficiency inA such accumulation, a motor 'for actuating the pump, means for supplying air and water to the pump, float means responsive to variations in the volume of water supplied, switch mechanism and electrical connections for operating the motor, to actuate the pump either as an air pump or a water pump, and connections between said float and said switch mechanism for operating the latter responsively to variations inthe position of the ioat.
In witness that I claim the foregoing I have hereunto subscribed my name this 14th day of January, 1930 LUCIAN F. EASTON.