US1858325A - Arrangement for starting and stopping exhaust steam injectors - Google Patents

Description

H. DEUTSCH May 17, 1932.

ARRANGEMENT FOR STARTING AND STOPPING EXHAUST STEAM INJECTORS Sheets-Sheet 1 Filed May 5, 1931 H, p LlZ SC/L May 17, 1932. H. DEUTSCH 1,353,325 ARRANGEMENT FQR STARTING AND STOPPING EXHAUST STEAM INJECTORS Filed May 5, 1931 2 Sheets-Sheet 2' Patented May 17, 1932 UNITED STATES PATENT, oFF is ms nEuTscH, or VIENNA; AUSTRIA, Assronoa To rim ALEX. nmnnmamv, or

I I VIENNA, AUsTaIA A ARRANGE-amnion STARTING AND scrorrnve EXHAUST STEAM INJECTORS Applicatlon illed May 5, 1931, Serial No. 535,251, and in Austria May 9, 1980.

Since the actuation of exhaust steam ingectors is somewhat involved and requires .much greater attention and ex erience on the part of the operator than t e ordinary live steam injectors, various automatic devices have been proposed which open and close the valves in the necessary manner by the actuation of a single hand lever. Such starting devices generally employ steam operated means for the distant control in the correct sequence of the difl'erent valves provided for live steam, water, exhaust steam and auxiliary steam. These arrangements, on account of the large number and length of the necessary steam pipes and of the complicated devices required for their operation,

considerably increase the first cost of the ex haust steam in ectors, or if arran em'ents are used with a single steam pipe etween the starting valve and the injector, there is the important drawback that the distant 0011- trol valves of the injector, more particularly the valves for the live steam and the exhaust steam or the auxiliary steam are not opened in the correct sequence and sensitiveness but impulsively and simultaneously, so that the starting ofthe feed apparatus is made much more difiicult' and often impossible.

@n starting the exhaust steam injector it is of considerable importance that the live steam from the boiler should enter the live steam nozzle some time before the exhaust V, steam or auxiliary steam valves are opened,

since the live steam entering through the central nozzle in the apparatus has a high velocity and thereby produces a high vacuum around it, so that the exhaust steam or auxiliary steam on entering afterwards has the necessary velocity. This sequence prevents any failure of the injector on starting.

Correct timing at the required moment can only he imparted by the feel or touch of the operator. Therefore, every device which excludes the co-operation of the operator involves for this reason a considerable ioulrce of error, since it is always liable to a1 The invention consists in a starting device for exhaust steam injectors in which the valves are, actuated positively in a purely mechanical manner and by means of a single hand lever, requiring also only a single steam pipe to the injector." By the positive connection of the single actuating device with the valves, these valves can be operated by the single hand lever of the setting device, not

' onlyin the correct sequence but also with the required sensitiveness.

The accom anying drawings show inFigs. 14 longitudinal sectional views of several embodiments of the invention, in which the exhaust steam injector is represented in section with the valves operated by the starting apparatus.

in the embodiment shown in 1 the control is effected by means of a rod 2 which acts on a displaceable cross-head l which is rigidly connected with the spindles 3 and 4: of the main steam valve- 5 and of the water valve 6. The live steam which is admitted by a boiler steam valve of the usual construction enters through the pipe 7. In the position shown, the rod 2 is displaced downwards so that both valves 5 and 6 are firmly pressed on their seats. If the rod 2 is now moved upwards, the main steam valve 5 and the water valve 6 are opened. A disc 8 attached to a downward extension of the main steam valve 5' opens the control valve 9 which in known manner is formed as a lost motion valve, so that the steam is admitted into the chamber 10, from which it opens the exhaust steam valve 11 by means of a known automatic device, when-the locomotive regulator -is open, or from which it passes as throttledauxiliary steam to the exhaust steam nozzles 25 and 26 of the injector, if the locomotive regulator is closed. v

The above mentioned automatic control device consists of a double seated valve 12 with a piston shaped extension 13. Steam from the slide valve casin is led by a tubulure 14 to the apparatus. If t e regulator is open, the valve 12 is in the lower position, as shown. Live steam can pass through the upper seat 15 from the chamber 10 through a passage 16 into a chamber 17 above a piston valve 18. The latter is pressed down on its seat and its extension 19 depresses an arm 20 pivoted at 21 against the resistance of a spring 22 and raises the exhaust steam valve 11 from its seat. The exhaust steam enterin by the connection 23 can now pass into t e chamber 24: and to the exhaust steam nozzles 25 and 26. v

If the regulator is closed, there is no pressure in the chamber 14. The extension 13 is then moved by the steam fiow set up through the seating 15 to the chamber 14 and past a valve 27 and forces the double seated valve 12 on to its upper seating. Steam now passes into a chamber 28 and from there through a passage into a chamber 29, whence it flows as throttled live steam into the chamber 24 and enters as auxiliary steam into the nozzles 25. 2G.

. It is obvious that the valve 9 can be opened by the teel of the driver by means of the rod 2, so as to ensure a correct starting of the exhaust steam injector in the simplest manner, and this in the formerly known devices with only one live steam pipe to the in-' jector was not possible.

Instead of the rigid connection between the moved crosshead 1 and the valve spindles 3 and 4, a loose positive connection can be arranged. For example, the nuts 30. and 31 can be replaced by stops which allow a certain relative play between the parts 32 and 33, so that the valves 5 and 6 are not opened simultaneously, but in succession.

The adjustable crosshead 1 could be re placed by a shaft rotatable in fixed bearings, the shaft carrying arms which engage in jaws of the valve spindles, on the rotation of the shaft press all the valves in the same direction on to their seatings, while if the shaft is rotated in the other direction the spindles and the valves secured to them are raised from the seats in the required sequence. The particular form of construction is not essential for the invention.

Fig. 2 shows a further example according to the invention. The crosshead 1 in this connection is connected by means of a link 34 with the rod 2. The crosshead 1 is formed as a lever to which the valve spindles 3 and 4 are linked at 35 and 36. In the position shown of the rod 2, the main steam valve 5 and the water valve 6 are depressed on to their seatings. If the rod 2 is now moved upwards, the boiler steam entering at 7 presses the valve 5 on its seat and the pin 35 forms a fulcrum for the crosshead 1, so that the arm on the left being depressed the water valve 6 is thereby opened until it engages with a stop 37 The pin 36 now forms a fulcrum for the crosshead 1 and, on the further upward movement of the rod 2, the pin 35 is raised and by means of the valve spindle 3 opens the main stean: valve 5. After a certain lost motion, the valve 9, as mentioned before, is raised from its seat by the disc 8. This arrangement also enables the specially controlled opening of the valve 9, which is important for the safe starting of the injector to be obtained.

In t e construction of the invention as shown in Fig. 3 the crosshead 1 is linked with the rod 2 by a pin 38. The crosshead forms a twoarmed lever at the ends of which the spindles 3 and 4 of the main steam valve 5 and of the water valve 6 are connected by eyes 39 and 40. 1

3 In the lowest position, as shown, of the rod 2, both valves 5 and 6 are firmly pressef on their seats. If the rod 2 is moved upwards, the connection 39 forms first a fulcrum for the crosshead 1 which, rotating about 39, is moved upwards. The spindle 4' and the water valve6 are raised and ti water inlet opened. As soon as the valve has reached its upper limit, in which it engages with a screw or other fixed stop 41, the part 40 forms a fulcrum for the crosshead,.which on the further upward move ment of the rod 2, is raised about this ful-- crum, lifting the valve spindle 3 and the main steam valve 5 from their seats. The disc 8 only begins to open the valve 9 after the valve 5 hasopened to a certain extent, so

that this arrangement also allows the same controlled operation of the valve 9 as previously described.

Finally, a construction is shown according to the invention in Fig. 4, which, after starting the injector is initiated, allows the open ing movement of the water valve to be throttled by feel. The device is the same as that shown in Fig. 3; on starting, however, the stroke of the water valve is limited by a chain 42 which is tautened and replaces the stop fixed to the casing of the injector. In this way, the crosshead 1 has a fixed fulcrum 43 about which with the parts 38 and 39 it pivots and is raised. 7

The main steam valve 5 1s opened and after it, by means of the disc 8, the control valve 9.

the steam inlet to the 'known automatic device for the admission of'exhaust steam. or auxiliary steam, in such a manner that the operation is effected by feel so that the valves are opened in the correct sequence and the control valve 9 is opened, after thefmain steam valve and the water valve are ensured.

What I claim is Y V i 1. An arrangement for starting and stopping exhaust steam injectors which contain a' device which under the action of boiler steam holds the exhaust steam valve in the open position when the locomotive re ulator is open while it admits throttled boiler, steam as auxiliary steam to the injector when the locomotive regulator is closed, comprisin manually operated -member, an ad'ustable member actuated by the former mem er and pivotally connected therewith, a water valve,

a main steam valve, a control valve adapted to admit boiler steam to said device for supplying exhaust steam or auxiliary steam, pivotal connections between said adjustable member and said main steam valve and said water valve, a fixed stop adapted to limit the lift of said water valve, this arrangement being ada ted to convert the pivot between saidad usta 1e member and said water valve into a fixed fulcrum for the adjustable member after the water valve has engaged with said stop and to enable said adjustable member to cause on its further movement about said pivot the opening of said main steam valve, and a mechanical connection having a lost motion between said adjustable member and said control valve, adapted to raise the latter from its seat only after said main steam valve has been opened.

- 2. An arrangement for starting and stop ping exhaust steam injectors which contain a device which under the action of boiler steam holds the exhaust steam valve in the open 7 position when the locomotive regulator is open while it admit; throttled boiler steam as auxiliary steam to the injector when the locomotive regulator is closed, com risin a manually operated member, an a justa le member actuated by the former member and pivotally connected therewith, a water valve, a main steam valve, a control valve adapted to admit boiler steam to said device for supplying exhaust steam or auxiliar steam, pivotal connections between sai adjustable member and said main steam valve and said water valve, 9. fixed stop onthe casing with which said adjustable member engages after said water valve has been opened, said fixed sto then servin as a fixed fulcrum for said ad ustable mem er, so that the latter raises during its further movement said main steam valve from' its seat on the one hand and approaches saidv water valve to its seat on the other hand, and a mechanical connection having a lost motion between said adjustable member and said control valve, adapted to

Images