US1652026A

US1652026A - Pumping plant for high-pressure steam generators

Info

Publication number: US1652026A
Application number: US108387A
Authority: US
Inventors: Loffler Stephan
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-05-16
Filing date: 1926-05-11
Publication date: 1927-12-06
Anticipated expiration: 1944-12-06

Description

' Dec. 6, 1927.

- 1,652,026 s. LOFFLER PUMPING PLAN! FOR HIGH PRESSURE STEM! GENERATORS Filed lay 11. 1926 3 Shoots-Sheet 1 Fig.1.

iiizmng Dec. 6, 1927. 1,652,026

' s. LOFFLER ruurmu rum ron area rasssuns STEM! GENERATORS Filed May 11. 1926 3 shoots-sheet 'B aw.

S. LUFFLER PUIPING PLANT FOR HIGH PRESSURE STEAK GENERATORS Dec. 6, 1927. 1,652,026

Filed May 11. 1926 3 Sheets-Sheet 3 Patented Dec. 6, 1927. I

UNITED STATES srnrnen Leanna, or cnanno'r'rnnnune, NEAR imanm, enmlm.

PUMPING PLANT FOR HIGH-PRESSURE STEAM GENERATOM' application fled Kay 11, 1 926, Serial No. 108,387, and in Germany May 18,

practice the method of generating highcomotive,

tsiressure steam described in my United tates application, Serial Number 701,855,

filedv March 25, 1924, in which steam pro-- duced in aboiler is further heated outside, and then re-intro'duced into, the same in. order to transmit the added heat to the boiler water and convert this into steam, all as more fully described in said former application.

' a The invention may be embodied in several constructional forms, the common charac-i teristic feature ofwhich resides therein that the pumps constituting the pumping plant, namely, a steam conveying pump and a boiler feed pump, are driven by an engine or a motor common to them both, and which is directly connected thereto or geared thereto, the output of the two pumps being regulable by varying the number of revolutions of the engine or motor. Means may be provided by which the output or delivery of the boiler feed pump can be regulated independ: ent of the steam conveyin pump, as is also more fully described hereinafter.

The invention is illustrated diagrammatically and by way of example on the accompanying drawings on which Figure 1 is a front view of a pumping plant designed according to this invention; Figure 2 is a" plan of a modification, "the two 0 linders being shown in horizontal section; igure 3 shows another modification in vertical section: Figure 4 shows again a modification, in horizontal section; Figs. '5 and 5" showthe invention applied to a movable plant, viz to a 10- Fig. -5 showing the arrangement and combination of the parts concerned partly in vertical section and partly in side-view, andFig. 5 showing it gartly in horizontal section and partly in p an; Figure 6 is a separate section solely throu h the steam conveying pump, together wlth its valvegear and some other parts; and Figure 7 is a 'diagrammatic representation of the valve; gear motion, all as more fully dealt with hereinafter, t

Referring to Fig. 1, 1 denotes ;the boiler feed pump, 2 the steam conveying pump, and 3 the engine which is common to both pumps and is assumed, in the example shown, to be anelectromotor. The dimensions of the pump cylinders are preferably PATENT OFFICE.

such that the size of the feed pump is chosen dependent upon the size of the steam conveying pump,

that is to say, if there are two or more steam conveying pumps there should be also two a or' morefe 'umps, always an equal number of pumps of 0th kinds. 7

In the constructional form shown in Fig. 1, the power. is transmitted from thev electromotor 3 to the pumps -1 and 2 by the intermediary of gearings 4 and 5. .'The output or deliver?l of both pumps can be varied by varying t e number of revolutions of the motor, so that if the pumps are piston pumps the relation between them is always the same,-

pertaining gearings may be desi ed with consideration of the difierence of t e characteristics of the two pumps so as to permit to vary the output. But instead of particularly designed gearings, a by-pass pipe rovided with a throttlifigyalve inaybe emp oyed, es-

pecially if the pumps are drivenby a pri-' mary englne, as will be the case with a loco motive. A byrpass' pipe'becomes, in fact, necessary if the boiler feed pump is some what larger than actually required which is i I I to be preferred from certain reasons; that pipe serves also for regulating the output. It 1350f course, possible to combine the two modes of regulation, viz that; by varyin the number of revolutions of the driving. s aft,

as well as that by employing a by-passlpipe with athrottling valve or her. Varying the number 0 the shaft may the number of revolutions of strokes'of the engine or the uivalent memwhereas if they are turbine pumps the apbe efiected by varying either 7 number of revolutions of the motor, or by v the intermedia as regards output may In the modified constructional form i lustrated in Fig. 2 the two 'umps 1 and 2 are operated simultaneously y a crank 3f rotated by the engine 3. The pumps are arrangedco-axially. The boiler feed pump is provided with -a return pi regulating member 7 is inserted, and the steamconveying pum is rovi'ded with a rby-pass pipe 8 provi member 9. The return pipe '6 and t e lating member 7 may be esigned. similarl of a suitable gearing, and

to the fuel pumps used in connection wit v Diesel engines. g

In Fig. 3 the steam conveyin ump 21's driven directly by the crank o t. e engine,

sole y the boiler feed pump its be varied by varying its stroke.-

fiinto which a.

ed with a regulating".

raga-v I the steam generation can be maintained, with tromotor, or the like.

whereas the boiler feed pump 1 is driven indirectly from the same crank by the intermediary of a frame 10, whereby the journal pressure is diminished.

high-pressure steam is warranted.

hile the main engine is at a stand-still,

a correspondingly diminished heating effect, by separate auxiliary pumps driven separately, for instance by a steam engine, an elec- According as the conditions of service at the time being may be, the auxiliary pumps may run also while the main engine 18 working, in which case .said pumps will run continuously; or they are made use of only in the case of overloading of the plant in order to increase the steam-production. It is suited to the purposes of the entire plant to employ the auxiliary pumps also for starting the highpressure steam generator. The umps are to be driven inisuch case by t e driving means or medium available while the main engine is at a stand-still, for instance by a low-pressure engine if low-pressure steam is available either in a boileror in an ac-.

cumulator; or an electromotor is usedand is fed from a net or a storage battery. The auxiliary pumps constitute in every case, irrespective of whether they run continuously or not, a safet contrivance for the service, apart from t e-other standb or spare means and safety appliances per aps provided. a

The output of the main pumps is being variedby varying the number of revolutions relatively to the main engine, or b means of a return device operatin in the irection from the delivery side to t a suction side of the pumps, or by varying the control gear of the umps, or in any other suitable manner. "I he auxiliary pumps may work, however, without any re lation if the conditions are normal. TE: service is rendered particularly favorable and simple if the variation of the output or delivery of the main pumps is efiected in dependency of the steam consumption of the main engine, i. e. in dependency of the valve control gear thereof.

Refenrin now to Fig. 4, 11 denotes the cylinder of a high-pressure steam engine constituting the main engine and driving directly a dynamo 12. At the free end of the crookedshaft 13 is provided an overhung crank 14 driving the boiler feed pump 16, as well as the steam conveying Jump 15 (may be, also other pumps required for the proper operation of the high-pressure steam instruments, or

feed cylinder or pump.

enerator as for instance a am for conveying cooling water to the stu 'ng boxes of the'piston rod or rods, to the measuring gauges and the like).

For starting t e high-pressure steam generator and for maintaining the production of--steam while the main engine is at a standstill, an auxiliary steam conveying pump 17 and an auxiliary boiler feed pum 18 are provided and are driven separately by means of an electromotor 20 by the intermediary of a belt 19 or any 0th is located between the wheels; 24, 25 are the steam conveying cylinders and 26 is the

The cylinders

21 and 24, as well as 23 and 25, are arranged co-axially, the respective pistons being secured to a continuous piston rod. Also the

cylinders

22 and 26 are arranged co-axially as shown. The valve control gear of the main driving cylinders has piston slides desi ed according to Heusinger. When the atifiission to these cylinders is varied also the'delivery of the main being varied positively of'the main driving cylinders. This ma with the main steam conveying umps, effected, for instance, by varyin t e osition umps is pipe 29. The control valve by the va ve control gear an suitable powerv transmitting means. Other auxiliary pumps of a control mefnber 28 locate in a y-tpaess gears have n omitted in the figure.

The steam conveying pum is designed preferably in a manner specia lysuited for its purpose, in that the two cylinder sides or ends of the double-acting pump are controlled by a positively operated piston slide (without any additional members such, for instance as return valves and the like} mon to both sides or ends of said cy inder, this slide being so designed that its lap is nearly zero or, perhaps even negative. By zero lap I comprehend that simultaneously with the closing of the suction pipe the pressure pipe is opened, and reversely. The advantage of this constructional form over those that \have become known hitherto re-.

com-- neturn-valves and the like, ma

regards pumps working means, especially as as for instance with a very high pressure,

with. a suction pressure of say 100 atmos-' lowermost stages of regulation; and as sepafor instance, be dispensed with, hi h numbers of revo ution can be employe An example of a steam conveying pump designed in accordance with the above stateshown in Fig. 6 in which 30 and 31 rate auxiliary members, as,

ments is denote the two sides .orfends of a doubleacting pump, and 32 denotes a piston sl de whichis common to both said sides or ends only on supply opening 33 and only one the gsu plied erhapstoo amply by tu 38 co ect at the lowermostvalve casin andleave it throug the aper-,

preferably also for the of the pump. This slide is designed as a hollow slide so that the casing for it. requires delivery opening 34 for the steam.

The lubrication of the. guide faces for piston and the piston slide s efiected chie a suitable means. In the example illustrated'in Fig. 6 bores 35 and .36 of the cylinder and the valve casing are connected by pipes 37 with a helical tube 38 locatedin a vessel through which cooling .water is con, ducted, this water being supplied, for instance, at a, and withdrawn at b. The condensate formin insaid helical ipe flows down to the gulde facesof the cy mder and the valve cas1ng.-

The condensate forming in the cylinder and in the valvecasing and the condensate the helical 'oint of the ture 39; t is aperture may be, employed I steam from the valve casing.

der and the valve casing" The pump cylin are'manufactured preferably from a solid piece of steel if the pump is, to work with apressure of, say,. 100 or even more atmos-I- pheres. a

The variation of the amountpf steam conveyed by the steam conveying cylinder may be brought about by a' p ass-shift between the pump piston and the slide valve, for instance with the aid of an adjusting eccentric.

In the constructional form shown in Fig. 6

. the crank shaft 40 is provided with a wormlike' sleeve 41 which can be shifted axially on said shaft, and is encompassed b an eccentric 42 prevented from axial isplacement by any suitable means (not shown).

re-adjusted by an agle B,

. y'by condensate drawn, for instance, 7 from the cylinder and being then cooled by discharge O .5118 .1

substantially as set forth. 5 p

3? 2. A: pumping plant for highs m ibn the direction to or from the valve casing a w brm-like sleeve, whereby the phase-shift is produced.

igure 7 shows gear. the angle a between the centric amounts to crank and the ec- If'the eccentric is figure, the suction pipe remains the suction stroke is commencing, and a art of the amount sacked as re-conveyed into the suction pipe. The action taking. place when the p ston performs its retlgn the angle between 0 and any maxi quantities of any demovement proceeds correspondingly.- varym mum egree, delive sired amount may e had between those limits. In order to prevent the arising of pressure shocks while the plant is inoperadelivered'is somewhat considerably diminished, the laps of the slidevalve' are adjusted to zero or even to negative, that is to say as already explained,-t e delivery pipe is closed simultaneously'with the opening of the suction pi e, and reversely, or, in other words, the cy inder is connected with the suction pipe, aswellas withthe delivery pipe when the suction stroke is changed into 'the delivery stroke, and reversely.

A control gear ofthis k 'nd is suited especially in those cases in which the steam conveying engine, pump with a separate driving engine or motor must be provided for the starting of the steam generator. I I claim: f." 1. A pumping plant for highressure steam generators of the kind in wich the steam 1s generated by steam heated outside the boiler and introduced or reintroduced mt o the water of the same, said plant .comprlsing a. steam conveying pump, a boiler feed um an en ine or a motor adapted a diagram of the 'valve' At the maximum output or delivery as indicated in the open when w ump is to be driven by themain ut, then, of course. an auxiliary.

'The eccentric can be moved more or less a corresponding axial shifting of said as may occur especially if-the amount 1 todrive oth sai pum s, and meansifor' varying the output or de ivery ofthej same,

ressure enerators of the kind in w steam is generated by steam heated outside the boiler and introduced or reintroduced. into the water of the same, said plant comprising a steam conveying pumpya boiler ichthe eed pum an engine or a motor adaptedto j drive hot the output separately,

3. A. "pumping steam enerators o substantiallyas set forth.

lant for highressure the kind in w ich the steam 1s generated by steam heated outside the boiler and introduced or reintroduced into the water of the same, said plant compumps and means for. varying or deliyery of both said pum'ps/ prising a piston pump adapted to be used as steam conveying pump, another piston pump adapted to be used as boiler feed sump, an engine or a motor adapted to rive said steamconveying pump, means for transmitting the driving power from the driving gear of said latter pump to said feed pum and means for varying the output or de ivery of this pump, substantially as set forth. a I

4. A pumping plant for highressure steam enerators of the-kind in wiich the steam is generated by steam heated outside the boiler and introduced or reintroduced into the water of the same, said plant comprising a double-acting steam conveying pump, a positively moved piston slide valve adapted to co-operate with both sides or endsof said pump and having laps amounting to zero or being even negative; a boiler feed pump, an engine or a motor adapted to drive both said'pumps, and means for varying the output or delivery of the same, substantially as set forth.

' 5. A pumping plant for high: ressure steam generators of the kind in w rich the steam is generated by steam heated outside the boiler and introduced or reintroduced into the water of the same, said plant comprising a double-acting steam conveying pump, a positively moved iston slide valve adapted to co-operate with 0th sides or ends of said pump and having laps amounting to zero or being even negative, and a condensate collecting chamber having a discharge opening; a boiler feed pump, an engine or a motor adapted to drive both said pumps, and means for varying the output or delivery of the same, substantially as set forth.

6. A pumping plant for high-pressure steam generators o the kind in which the steam 1s generatedby steam heated outside the boiler and introduced or reintroduced into the water of the vsame, said plant comprising a double-acting steam conveying pump, a positively moved piston slide valve adapted to co-operate with both sides or ends of said pump and having laps amounting to zero or being even negative; a steam condensing device so arranged as to be adapted to deliver lubricating condensate to the guide surfaces of he pistons a boiler feed pump, an engine or a motor adapted to drive both said pumps, and means for var ing the output or delivery of thesame, su stantially as set forth.

A pumping plant for highressure steam generators of the kind in w ich the steam 1s generated by steam heated outside the boiler and introduced or reintroduced into the water of the same, said plant comprising a double-acting steam conveying pump, a positively moved piston slide valve adapted to co-operate with both sides or ends of said pump and having laps amounting to zero or being even negative; means for varying the output of the steam conveying pump by varyin the phase-shift between the piston and t e valve gear thereof; a boiler feed pump, an engine or a motor adapted to drive both said pumps, and means for varying the output or delivery of the same, substantially as set forth.

In witness whereof I have hereunto set my hand.

STEPHAN LOFFLER.