US1849900A - High pressure hot water pump - Google Patents

Description

March 15, 1932. c ALLEN 1,849,900

HIGH PRESSURE HOT WATER PUMP Filed July 17, 1931 4 Sheets-Sheet 1 March 15, 1932. c, ALLEN 1,849,900

I HIGH PRESSURE HOT WATER PUMP Filed July 17, 1951 4 Sheets-Sheet 2 ATTORNEYS March 15, 1932. c. D. ALLEN HIGH PRESURE HOT WATER PUMP 4 Sheets-Sheet 3 Filed July 17, 1931 C. D. ALLEN March 15, l 932.

HIGH PRESSURE :HOT WATER PUMP Filed July 17, 1951 4 Sheets-Sheet 4' 4 M17220 .NVENTOR ATTORNEYS Patented Mar. 15, 1932 UNITED STATES PATENT OFFICE CHAUNCEY D. OI PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO CON- SOLIDATED ASHCROFT HANCOCK COMPANY, INC., OF NEW YORK, N. Y., A CORPORA- TION OF DELAWARE HIGH PRESSURE 1101 WATER PUMP Application filed July 17,

The present invention relates to an improved high pressure hot water pump for use in connection with locomotives, the purpose being to feed hot water into steam boilers of such locomotives.

Heretofore it has been the customary practice to "employ exhaust steam injectors or water pumps in connection with open or is very common, and in describing such a. type forlocomotwe boiler feeding, exhaust steam or condensate are utilized as the heat medium.

Wherein this description covers a portable application of the invention, such as to a locomotive, which is a portable apparatus, it is understood that it is equally useful on stationary heating and marine service as a condensate mover and vacuum producer.

In past practice in connection with pre- 20 heaters exhaust steam under pressure has been used and the efiiciency of the heaters were dependent upon the high exhaust steam pressure or back pressure ofthe engine. This would naturally encourage the excessive use of steam through the engine to obtain the required'amountof back pressure for forcing its way through the heaters. It has been proven conclusively' that engines are more efiicient with reduced back pressure and oper- 'ated with as little exhaust steam as possible.

It is the purpose of the present invention to simplify the now existing arrangement, and to provide a feeding devicesuch as a high pressurehot water pump, for the boiler,

of a kind such as is very compact and in a single unit of small compass for the occupation of a relatively small space on the 1000- motive, and yet have an extremely wide range of feeding action, and therefore insure de- 59 livery of hot water at all times to the boiler,

1931. Serial No. 551,523.

the exhaust steam being condensed for preheating, by steam entrainment and thereby insuring a highly heated supply of hot water in maximum quantity to the boiler, and yet provide an easy maintenance of such supply to the boiler.

In the present invention it is the purpose to provide a substantially compact construction of device or apparatus, in a single unit, especially adapted for direct and positive entrainment of the exhaust steam from the exhaust cavities, through the medium of a vacuum, hence insuring the drawing of the required amount of exhaust steam for preheating the water and reducing the back pressure from the engine or condenser, instead of having a back pressure built up and forcing its way into heaters.

A still further purpose is to provide in a high pressure hot water pump a-substantial- 1y compact o'onstruction'in a single unit having therein at one end a steam driventurbine,

and one or more impellersincased in the unit approximating the other end thereof, introducing cold water (substantially 40 de rees) against one impeller, said water then ing heated through the medium of entrainment and vacuum being transmitted into a chamher at pressure and against and into the suction side of a second impeller and discharged and finally conducted to a boiler, the flow of exhaust steam from the exhaust cavities giving heat to the water and assisting heat entrainment and substantial vacuum in the transmission of the water into the chamber and against the subsequent impeller.

It is to be understood that the particulars c herein given are in no way limitative, and

that while still keeping within the scope of the invention, any desired modification of details and proportions may be made in the construction of the appliance according to circumstances. I The invention comprisesfurther features and combination of parts to be hereinafter set forth, shown in the drawings and claimed.

In the drawings Figure 1 is a view in side elevation of a conventional type of locomotive, showing applied thereto the improved high pressure hot water pump in a substantially compact construction in a single unit for feeding water I to the steam boil'er of the locomotive. I Figure 2 is an enlarged view in side elevation of the high pressure hot water pump in a single unit detached from the locomotive.

- Figure 3 is a longitudinal sectional view through the high pressure hot. water pump, illustrating the steam driven turbine at one end and the impellers substantially close I to the other end including a casing housing such arrangement in a single unit.

Figure 4 is an end view of the high pressure hot water pump constructed in accordance 'with the invention. a II Figure'5 is a sectional view on line 55 of Figure 3. I

Figure 6 is a sectional F i re 3.

igure 7 is an enlarged sectional view of one of the control valves shown in Figure 1 and located in the exhaust steam pipe line from the exhaust cavities.

Figure 8 is a sectional viewon line 88 of Figure 7. I

Figure 9 is a sectional view through the thermostatically controlled valve.

Referring to the drawings 1 identifies a locomotive, of conventional type, and 2 is a hose bag connection, which receives its supply of water from a reservoir (not shown) to be carried by thetender. This hose bag. connection unites at .3 with the inlet duct 4 formed through an extension 5 of the highing 14, of theball bearingtype,is provided for the driven shaft 15, while a similar bearing of the anti-frictional type is located near the other end of the pump. Suitable cap plates 17 and 18 are bolted at 11 and 12 .to'

the lower section 9 of the casing, for the purose of housing the structural details of the earings.

The bearings 14 and 16 are of the usual standard construction consisting of the inner and outer rings 18 and 19 with the intermediate bearings 20. The inner rings of the bearings are fast to the driven shaft 15.

The driven shaft passes through conventional types of packing glands 21 and 22, so

- 'as to prevent leakage from the interior oi the casing.

The shaft is driven by a conventional type of steam driven,turbine 23, which is housed in one end of the casing 7 theses prior'to view on line 6'6 of ,Fixedl "nmnkpameshes 1s '1; a sleeve 25, and als fixedlyshrunkon the same shaft.

' at 26 and27 'rel impellers 28 and 29, which operate mpart, entrifugal action to the p sa' the'rethrough. In order to additionally insure retaining the impellers fixed relative to thej shaft 15 lock plates 30 and-31 are'threadedon the shaft. A suitable spanner wrench (not shown) may be used to engage with lthe I depressions 32 for turning the lock plates to; insure tightening the impellers against, -the' ends-of the sleeve 25.

Thesleev'e'25, the impellers 28 and 29, of

the latter of wh-i'ch 'there maybe two or more, Y it depending; on I the? desire capacity ofthe pump, and the'l loIcllrplates are mounted upon I I fife-installation of the shaft, in the pmnp as'in -izi.

The reason forTc'onstructing the casing 7 in two sections 8 and 9 is topermit the shaft 115 andv tlre. impellers to be housed in the casing. I Y t v v The fact is the structure of the bearings 14 and 16.,and the packing, gland sleeves are mounted upon the shaft15 .prior toits being mounted in the casing.

Arrangedtohave a slip fit on the sleeve 25 is a ring 34. -In other words the sleeve 25 has a slip fit in the ring 34,'which is placed in position before the-section 8 of the casing is arranged and secured in position. This ring 34 'aets as a wearing ring. v

1 Suitable. backing rmgs 35 surround th I, hub sleeves" 36 of'theimpellers,thereby preventing any leakageof the'fluid. 'Each imtially tangentiallyarranged curved blades 37 causing similarly arranged passages38 to be formed, andwhich assages adjacent the peripheral edge are su stantially'wider than the origins 39 of the passages. ence since the impellersare revoluble. with the shaft 15 and are rotated at asubstantially high speed, a-

substantial centrifugal action is imparted to I the fluid during its assage throughthe impellers. This centri ugal action to the fluid gives force and power'to it in order that it may be carried to its destination to perform the Work intended. 'It is to be noted, by reference to Figure 5, of the drawings, that the chambers 40 and 41 in which the impellers rotate are eccentric'ally formed.- For instance referring to Figure 5 it will be noted that the chamber or passage 41 merges in a taper from a point 42 to a larger portion at 43, where the fluid or water discharges from the pump at 44. The passage 40 in which the impeller 28 operates is just the opposite in its formation. I I,

The section 8 of the casing is provided with a water chamber 45 in which the water from an v peller 28 and 29, comlglrises,abody of sub ever the chambers 45, 49 and 52 are in communication. The wall 53 intermediate the chambers 45 and 49 has threaded therein a plurality of entrainer nozzles 54, the outlet ends 55 of'which are in close proximity to the inlet ends 56 of the entrainer tubes 57, which are threaded in the wall 58 intermediate the chambers 49 and 52. It will be noted that the outlet ends 55 of the entrainer nozzles 54 are smaller in diameter than the-inlet ends 56 of the entrainer tubes 57, so that as the water discharges from the entrainer nozzles into the entrainer tubes, steam entering the vacuum chamber 49 at from 2 to 15 lbs. pressure, a vacuum is created substantially at 59, creating an entraining action on the steam, the steam acting to thoroughly heat the water to a substantially high temperature, and which water passed through the entraining tubes 57 and is discharged into the chamber 52 with a head approximating 30 lbs. pres sure. The water from this head in the chamber 52 enters the second impeller at a substantially high temperature, and is given a centrifugal action through the medium of the impeller 29 and discharged through the passage 44 and thence to and through the pipe line 60 to the boiler. The water pipe line 60 hasa T 61, to which a pipe 62 is connected, and which in turn is connected at 63 to a water control valve '64, the operation and construction of which will be hereinafter disclosed. The fact is the construction of the control valve 64 is similar to that shown in Figure 7, which illustrates a conventional type of steam control valve 65 carried by the steam exhaust pipe 48 in Figure 1.

Connected at 66 to the steam control valve 65' is a pipe, 67, which is connected at 6.8 to the steam supply 69 which is connected to the steam chest of the locomotive. Connected to the T 47 is a pipe 70, which is in turn connected at 71 to the steam discharge conduit 72 leading from the chamber 7 8 in which the steam driven turbine is operative.

Extending from a steam valve connection 74 (which is at all times open) with the boiler, is a pipe 75 having a valve 76 provided I with an extension handle 77 and hand wheel 78 located in the lomomotive cab, the extension handle passing through the front wall thereof, so as to permit control of the steam in passing through the pipe 7 5 from the boiler. The pipe 75 in turn enters a boss 79 of an extension 80 of the head 81, which is bolted at 82 to the casing 6 of the pump, thereby closing the steam turbine chamber 73. This pipe 75 where it connects to the boss communicates with an internal passage 83 in the governor valvecasing 84 shown more clearly in- Figure 3, and therefore conducts steam into the steam turbinechamber 73 to impinge on the steam turbine Wheel inthe usual way, and since the turbine wheel is connected directly to the shaft 15, power is transmitted to the shaft and thence to the impellers 28 and 29. The revolving of the impeller 28 induces substantial centrifugal action on .the water passing through the impeller 28, and

forces the water, first through the nozzles 54, and then through the entrainer tubes 57 into the chamber 52 and thence through the second impeller, which in turn forces the water through the delivery passage 44 and through the delivery pipe 60 to the boiler. As previously stated when the water is forced through the nozzles 54 into the mouths of the entrain-- ing tubes at hight speed, a vacuum is formed, which entrains the exhaust steam or condensate, thereby heating the water in its passage.

The valve 76 is of the usual standard construction, and when it is open steam is conveyed from the boiler connection to the pump turbine. Mounted in the valve casing 84 is a valve seat ring 85, with which a valve 86 cooperates for supply of steam to propel the pump.

The steam after enteringthe chamber 73 and serving to impart revoluble movement to the turbine wheel 23 passes through the pipe 70 and enters the T 47 and unites with the this pressure of water passes through thepipe 62 and enters the control valve 64 at 66a 1n Figure 1. The pressure of water at this point operates a'valve similar to that shown at 87 in Figure 7. At this. pointit might be said that the control valve shown in Fig ures 7 and 8 may be used for water or steam, andjn describing the construction and operation of the valve shown in Figures 7 and.8, the description serves for application to both control valves 65 and 64, one operated by steam through the pipe 67 the latter operated by water through the pipe 62.

The high pressure fluid passes through the duct 88 and creates pressure on the face 89 of the valve 87, operating the valve 87 against the tension of the springs 90. The construction of the control valve shown in Eigures 7 and 8, comprises a ring 91, across the diameter of which a spider 92 is formed, the spokes of the spider having passages 88 and 88a. The ring 91 engages against the shoulder 93 formed internally of the casing 94, and en-' 7 limited in its action by its shoulder 101 engaging with the shoulder 102. A cotter pin 103 prevents unscrewing of the collar 99. The valve 87 really carries the steam control valve 104, which seats at 105 against the edge of thering 91. The valve 87 has a stem 106 which is guided in a bearing 107 of a second spider 108 formed on the interior of the casing 94. Therefore when the valve 87 is operated against the tension of the s rings 90 exhaust steam is allowed to enter t e pump. It is obvious that even with the front. exhaust control valve open and the pump not running, exhaust steam will not pass into the pump vacuum chamber 49.

It is likewise obvious that with the pump running and hydraulic pressure built up, no

. exhaust-steam will enter the pump vacuum chamber 49 unless the main throttle is open.

The two control valves operating in conjunction, with the main throttle open, permits the flow of exhaust steam to the vacuum chamber 49 of the pump; not operating in conjunction, no steam or foreign matter will enter the pump; neither will water flow from the tank to thecylinders.

When the main throttle is open steam pipe pressure will enter the control valve at 66,-

I the steam pressure instead of water pressure on the valve 87 will operate the valve against the tension of the springs 90, opening passageway for the admission of exhaust steam to the main exhaust pipe line 48. It is obvious that when the main throttle is in closed position the valve 104 will rest against its seat 105 and no air, smoke box gas, or foreign matter will enter the exhaust pipe 48.

It is obvious that some oil is allowed to flow from the cylinders of the locomotive along with the exhaust steam or condensate through the pipe 48, especially if too large a quantity of oil is allowed to be fed into the steam chest valves and the cylinders of the engine, and'to prevent this oil from re-entering the boiler in which hot water is used a separator 109 of any conventional or accepted type may the chamber 52 and terminates in any be used in the pipe 48, for the purpose of separating the oil fromthe exhaust steam.

It is obvious and understood that the shaft 15'Eould be electrically driven, for the purpose of imparting revoluble movement to the impellers 28 and 29.

The front wall of the chamber 52 is provided with threaded openings 110, whichare made axial with the entrainer tubes 57. The openings 110 receive threaded plugs 111 provided with polygonal heads 112, to which a wrench may be applied for turning the plugs home. The inner faces of the plugs have central extensions 113, which tend to divide the heated water as it is forced into the chamber 52, thereb breaking it up, hence allowing it to enter the impeller 29 with its full'force.

.The purpose of the plugs is to enable the entrainer tubes to be inserted and then connected in place. The fact is the entrainer tubes may be inserted through theopenings 110 and then threaded into the positions shown in Figure 3, after which the openings 110 can be closed by the plugs. In this device there is a constant control'of the volume of exhaust steam that is entrained, the steam in turn heating the water, which finally en- "ters and passestlirough'the delivery pipe 60.

The control is automatic, preventing exhauststeam from the exhaust cavities of the engine from entering the entrainin or vacuum chamber until a pressure-has been attained or an amount the device is regulated to accfimmodate, has accumulated in the steam c est.

It is to be understood that enginesparticularly of the locomotive type usin exhaust steam for creating a draft on the res must have a prescribed amount for successful op-' .eration, therefore the automatic arrangement herein described 1s to provide for an amount of steam to enter the chamber 49 from the steam exhaust pipe 48 for entraining purposes, without causing injurious effects on the draft of the fires.

In the present device the water is deliv- I ered to the boiler hot at all times owing to it being heated through the medium of live steam supplied direct from the boiler without heat unit loss other than the slight amount of radiation when exhaust steam is not available. a

Arranged in the'pipe 75 with a thermostatically controlled valve 117. A flexible capillary tubing 118 extends from the thermostatically controlled valve 117 and in turn passes through the wall of the upper section 8 of the pump casing and into well known type of mercury bulb 119. The pipe 116 passes through the side wall at 120 of the upper section 8 of the pump casing and terminates on the interior of the vacuum chamber 49 of the pump. The thermostatically is e. T 115 and connected to the T is a pipe 116 provided than a slight amount of radiation, can at all times be delivered to the boiler. It is obvious that upon opening the valve '7 6 live steam will not only pass through the pipe 75, but also through the pipe 116 due to the thermostatically controlled valve 117 being open,

which will heat the water passing through the nozzles and the entraining tubes, which are located in the vacuum chamber 49. It is obvious that the shaft can be speeded up, so that the water can be discharged from the impeller 28 into the chamber so that the water when leaving the nozzles can develop a head of relatively high velocity,

which in entering the entraining tubes 57 will entrain the steam in the chamber 49, the

- steam in turn heating the water, in which case the ejector means (which consists of the nozzles and the entraining tubes), will act to discharge the water into the chamber 52 with a head substantially one quarter the head passing from the nozzles to and through the entraining tubes. When this head of substantially one quarter the head passing from the nozzles to and through the entraining tubes, reaches the desired temperature in the chamber 52, the mercury in the mercury bulb expands in the mercury tube or flexible capillary tubing 118 and thereby closes the valve proper 121 and consequently prevents live steam from passing through the pipe 116 into the chamber 149. However as long as the tank water in the chamber 52 is cold and the pump is not operating the valve proper 121 is open.

The thermostatically pperated valve, in

- general, comprises a frame 123, which supports the valve casing 117, and in the upper part of the frame the diaphragm units 122 are supported, and upon expansion of the diaphragm units the valve proper 121 closes. The valve proper includes a stem 124 which isin two sections, a spring 125 tensioning/the valve stem, which spring together with the contraction of the diaphragm units retains the valve 121 open The spring 125 of steel is cadmium-plated, and being of large diameter is housed in the upper part of the frame away from the heat. Where the two sections of the valvestem connect, a secondary spring 126 is located between the upper and lower sections of the stem, protecting the bellows type of diaphragm units from over pressure by accidental overheating of the pump. In

' other words this spring 126 acts as a safety device. This thermostatically controlled valve is of conventional or standard type. V

In the present device exhaust steamis cut off at such time as the engine is working and the boiler feed not working thereby preventing the tank water overheating.

The invention having been set forth, what is claimed is: p

1. In a high pressure hot water pump, a casing having a cold water inlet and a hot water outlet, said casing provided with a steam inlet includin a vacuum chamber internally thereof, a riven shaft in bearings of the casing, a water course internally thereof and revoluble means operative with the shaft and in the water course for impelling the water and impartin high power centrifugal action thereto or carrying water through the course and discharging it through the hot water outlet, and high pressure ejector tube means in the water course and incident to the steam vacuum chamber, so constructed and arranged that, the water in passing through said chamber, creates a substantial vacuum and entrains the'steam' for heating the water.

2. In a high pressure hot water feeding means for steam boilers, the combination,

with an engine and a boiler supplying steam vthereto, of a pump having a-driven element therein and provided with aicold water inlet and a hot water outlet, the latter having a delivery pipe connection with the boiler, said pump having a circuitous water course connecting the inlet and the outlet and provided with a vacuum chamber and a steam pipe connecting the vacuum chamber and the exhaust cavities of said engine for conducting exhaust steam to the vacuum chamber, rotating impellers operative with the driven element and in the circuitous course for impelling the water thereby imparting high power centrifugal force, steam entralning means in the vacuum chamber and in said course i and between the impellers, whereby the water in passing entrains the steam, the latter heating the former, a pair of control valves in the steam pipe, one being connected to the delivery pipe and actuated by hydraulic pressure from the delivery pipe, the other-being operated by steam passing to the engine,. both control valves operating in conjunction er centrifugal action, a heat fluid chamber in said water course internally of said casing for the r ception of exhaust steam from said exhaus cavities of an engine for heating the water passing through the course, a hot water head chamber in said water course internally of said casing beyond the heat fluid chamber, means for introducing live steam into the heat fluid chamber from said live call controlled valve in the path of the live steam and having thermal actuating means in the head pressure chamber, so arranged that, upon hot water entering the head pressure chamber, the thermal means expands and closes the thermostatically controlled valve.

4. In a high pressure hot water pump, a casing having a cold water inlet and 'a hot Water 'outlet, said casing having a water course internally thereof, a driven element in bearings of the 'casing, spaced revoluble impelli-ng means operative with the element and internally of the casing and constituting parts of said water course for impellin the water and imparting high power action t ereto and causing its discharge through the hot water outlet, said casing having a steam in- 'let including a vacuum chamber internally of said casing in said water course between the spaced lmpelhng means, and water et means in sa1d vacuum chamber between the cluding an imperforate Venturi combining tube having its inlet end located in said vac- .uum chamber and a nozzle arranged to discharge a jet of water into the inlet end of the Venturi tube and so arranged that thewater in passing through said jet acts to maintain a constant substantially full vacuum in said vacuum chamber to entrain the steam for heating, the water.

5. In a high pressure hot water pump, a casing having a water inlet and a water outlet and a circuitous course connecting said inlet and outlet, a driven element in bearings of the casing and provided with spaced impelling means operatively revoluble with said element and internally of the casing in said water course, and adapted for imparting high power action to the water and causing its discharge through the outlet, said casing provided with a steam inlet including a vacuum chamber internally of the casing and located between the spaced impelling means, high pressure ejector tube means in said circuitous water course and located in said steam vac-v uum chamber, said high pressure ejector tube means including an" imperforate Venturi combining tube having its inlet end located in said vacuum chamber and a nozzle arranged to discharge a jet of water into the inlet end of said Venturi tube and the construction and arrangement of said high pressureejector tube means being such, that the Water in passing through said chamber acts to create and maintain a constant substantially full vacuum in said vacuum chamber to entrain the steam for heating the water.

6. In a high pressure hot water feeding means for steam boilers, the combination with an engine and a boiler supplying steam thereto, of a pump having a driven element thereinprovided with a cold water inlet and a hot water outlet, the latter having a delivery pipe connection with the boiler, said pump having a circuitous water course connecting the inlet and the outlet and provided with a vacuum chamber and a steam pipe connecting the vacuum chamber and the exhaust cavities of said engine for conducting 'exhaust steam ,to the vacuum chamber and thereby lessening back pressure of the exhaust steam on said engine, spaced revoluble means operative with the driven element and in the circuitous course for impelling the water and thereby imparting high power centrifugal force, steam entraining means in the vacuum chamber in said course and between the spaced impelling means, whereby the water in passing entrains the steam, the latter heating the former, a control valve in the delivery pipe for permitting the flow of exhaust steam to said vacuum chamberof thepump.

spaced impelling means, said jet means in- 7. In a high pressure hot water feeding means for steam boilers, the combination with an engine and a boiler supplying steam thereto, of a pump comprising a casing with a driven element therein, said casing provided with a cold water inlet and a hot water a vacuum chamber internally thereof and in said circuitous course and located between the spacedimpellers, a steam pipe connecting the vacuum chamber and the exhaust cavities of said engine for conducting exhaust steam to the vacuum chamber, and ejector tube means in the vacuum chamber and in said course andbetween the impellers, whereby the water in passing entrains the steam, the latter heating the former.

8. In a high pressure hot water feeding means for steam boilers, the combination with an engine and a boiler supplying steam thereto, of a pump comprising a casing with a driven element therein, said casing pro-' vided with a cold water inlet and a hot water outlet, the latter having a delivery pipe connected with the'boiler, the casing of said pump having a circuitous water course internally thereof and, connecting the inlet and the outlet, spaced revoluble impellers operative with the driven element and in the circuitous course for imparting high power centrifugal force to the water, said pump casing having a vacuum chamber internally thereof and in said circuitous course and located between the spaced impellers, a steam pipe connecting the vacuum chamber and the exhaust cavities of said engine for conducting exhaust steam to the vacuum chamher, and e ector tube means in the vacuum chamber and in said course and between the impellers, whereby the water in passing entrains the steam, the latter heating the former, and a control valve in said steam pipe and being actuated by steam passing to the engine, for permitting the flow of exhaust steam to said vacuum chamber.

9. In a high pressure hot water feeding means for steam boilers, the combination with an engine and a boiler supplying steam thereto, of a pump comprising a casing with a driven element therein, said casing pro-' vided with a cold water inlet and a hot water outlet, the latter having a delivery pipe connected with the boiler, the casing of said pump having a circuitous water course internally thereof and connecting the inlet and the outlet, spaced revoluble impellers operative with the driven element and in the circuitous course for impartinghigh power centrifugal force to the water, said pump casing having a vacuum chamber internally thereof and in said circultous course and located between the spaced impellers, a steam 'pipe connecting the vacuum chamber and the exhaust cavities of said engine for conducting exhaust steam to the vacuum chamber, and ejector tube means in the vacuum chamber and in said course and between the impellers, whereby the Water incpassing entrains the steam,. the latter heating the former, a pair of control valves in the steam 1 e, gige and'actuated by hydraulic pressure from the delivery pipe, the other being operated by steam passing to the engine, both control valves operating in conjunction for permitting the flow of exhaust steam to said vacuum chamber. I

10. In a high pressure hot water feeding means for steam boilers, the combination with an engine and a boiler supplying steam thereto, of a pump comprising a casing with a driven element therein, said casing pro vided with a cold water inlet and a hot water outlet, the latter having a delivery pipe connected with the boiler, the casing of said pump having a circuitous water. course internally thereof and connecting the inlet and the outlet, spaced revoluble impellers operative with the driven element and in the circuitous course for imparting high power cen. trifugal force to the water, said pump casing having a vacuum chamber internally thereof and in said circuitous course and located between the spaced impellers, a steam pipe connecting the vacuum chamber and the exhaust cavities of said engine for conducting exhaust steam to the vacuum chamber, and

steam, the latter heating the former, a live steam source and a pipe connecting the source with the vacuum chamber, for introducing live steam into the vacuum chamber, said pump casing having a hot water head chamber internally thereof and in the circuitous course beyond the vacuum chamber, and a thermostatically controlled valve insaid live steam pipe and having thermal actuating means in the head pressure chamber, so arranged that upon hot water entering the head chamber the thermal means expands and closes the thermostaticallycontrolled valve;

11. In a high pressure hot water pump, a unitary casing having a cold water inlet and a hot water outlet and a circuitous water course internally of the casing and connecting the inlet and outlet, a revoluble steam "driven element in bearings of the casing, spaced impellers internally of the casing and in said circuitous water course and operative with said element, said casing having a steam inlet including a vacuum chamber internally of the casing and intermediate the spaced impellers in said circuitous water course, and water jet means forming a part of said circuitous water course and located in the steam vacuum chamber internally of the unitary casing, said means including an imperforate one being connected to the delivery Venturi combining tube having its inlet end located in said vacuum chamber and a nozzle arranged to discharge a jet of Water into the inlet end of said Venturi tube, the construction and arrangement of said jet means being such, that the water in passing through the jet means, creates a substantially full vacuum.

in said vacuum chamber tube to entrain steam for heating the water.

12. In a high pressure hot 'water pump system, a unitary casing having a cold water inlet and a hot water outletand a circuitous water course internally of the casing andconnecting the inlet and outlet, a revoluble steam driven element in bearings of the casing, spaced impellers internally of the casing and in said circuitous water course and operative with said element, said casing having a steam inlet including a vacuum chamber internally of the casing and intermediate the spaced impellers in said circuitous water course, and high pressure tube means forming a part of said circuitous water course and located in the steam vacuum chamber internally of the unitary casing, the construction and arrangement of said last named means being such, that the water in passing through the vacuum chamber, creates a substantially full vacuum and entrains steam for heating the water, a live steam source and a pipe connecting said source and the steam vacuum chamber for introducing live steam thereinto, a hot water head chamber internally of the unitary casing and. in said circuitous course beyond the vacuumichamber, and a thermostatically controlled valve in the path of the live steam passingthrough the pipe connecting the live steam source and the vacuum chamber, said thermostatically'com trolled valve having thermal actuating means in the head pressure chamber, so arranged that upon hot watenentering the head pres-' sure chamber, the thermal means expands and closes the thermostatically controlled valve.

13. In combination'with a circuitous water course, of spaced impelling means insaid course and adapted to be so speeded up as to impart to the water a head of relatively high velocity, a steam vacuum chamber between said imp'elling means'and in said water course, and ejector means positioned across said chamber between said impelling means and in said course for conducting the head of relatively high velocity through that part of the course incident to the chamber creating an chamber between said impelling' means and in said water course, and hig h pressure ejector tube means positloned across sald' chamber between said impelling means and in said course for conducting the head of relatively high velocity through that part of the course incident to the chamber creating an uninterrupted constant vacuum in the chamber, the

steam therein thereby mixing with and heating the water, said ejector means being so constructed that the water discharges from said ejector means with a head substantially one quarter the head passing across the vacuum chamber.

15. In a high pressure hot Water pump, a casing ,havinga cold water inlet and a hot wafer outlet and provided with a circuitous water course internally of said casing .and connecting the inlet and the outlet, a driven element in Bearings of the casing, rotating impellers operative with the driven element and provided with passages arranged tangentially with relation to the central bodies of the impellers for imparting high power centrifugal action to the water for conduct ing the same through said circuitous course from the inlettto the outlet, said casing having internall thereof a vacuum heated fluid chamber in t e water course and between the impellers, and high pressure ejector tube.

means in the circuitous course between the impellers incident to' said fluid chamber and s0 arranged that the water in passing through said ejector tube means creates a substantial full vacuum in the fluid chamber thereby entraining the heated fluid which in turn heats the water.

16. In a high pressure hot water pump,

a casing having a cold water inlet and a hot water outlet and provided with a circuitous water-course internally of said casing and connecting the inlet and the outlet, a driven element in bearings of the casing, rotating impellers in said course and operative with the driven element andvprovidedwith passages arranged tangentially with regard the central bodies of the impellers for imparting high power centrifugal action to the water for conducting the same through said circuitous course, said casing having a vacuum heated fluid chamber internally of said casing between the impellers and the water course,

means'in the circuitous course between the impellers, whereby the water in sald assage creates a vacuum 111 the heated uid chamber, and entraining the fluid which in turn heats the water, said fluid entraining means comprising nozzles and entraining tubes, the former discharginginto the latter, said nozzles and tubes so relatively arranged as to -create the vacuum and entraining action. a a 17. In a highpressure hot water pump system, for delivering hot water to steam boilers, the combination with a pump having a cold water inlet for connection with a water supply and having a water outlet, of a delivery pipe connecting the outlet and a boiler, said pump having a steam driven turbine at one end including a revolubl'e member driven thereby, said pump having a circui tous water course connecting the inlet and the outlet, means connecting a vacuum steam chamber and the exhaust steam cavities of an engine for conducting exhaust steam to the pump, spaced water impelling means in said circuitous course and operative by the driven element for impelling the water in said course imparting high power centrifugal action to carry the water to the outlet and send it through the delivery pipe to the boiler, said vacuum steam chamber being arranged internally of said, pump between said spaced 'impelling means and in said water course and receiving exhaust steam from the exhaust cavities, and high pressure ejector tube means internally of said pump and in said circuitous course and located in the vacuum steam chamber for conducting the water through the course and entraining the steam in the'vacuum chamber, whereby the water may be heated by the steam.-

18. In a high pressure hot water pump system, a casing having a circuitous water course with an inlet and an outlet and pro vided with means for sending water through the course and imparting high power action' thereto, a heat fluid chamber for the reception of exhaust steam from an engine for heating the water passing through the course, a

I hot water head chamber beyond the head ly controlled valve, and means substantially mid way the water course and incident to the heat fluid chamber for entrainment of the steam, which means is so constructed and arranged that said water with the high power action of the water creates a head in the head pressure chamber substantially not less than thirty pounds pressure.

In testimony whereof I aflix my signature,

CHAUNCEY 1D. ALLEN.

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