US978000A - Steam-injector. - Google Patents

Description

. R. 0. BROOKE. STEAM INJECTOR. APPLIOATION FILED APB. 18,1910;

Patented Dec. 6, 1910.

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APPLICATION FILED APR. 18,1910.

PatentedDec. 6, 1910.

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ROBERT GRUNDY BROOKE, OF MACCLESFIELID, ENGLAND.

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Specification of Letters Patent.

Patented Dec. 6, 1910.

Application filed April 18, 1910. Serial No. 556,122.

To all whom it may concern:

Be it known that I, ROBERT GRUNnY BROOKE, a subject of the King of Great Brltain and Ireland, residing at Macclesfield, in the county of Chester, England, have invented Improvements Relating to Steam- Injectors, of which the following is a specification.

This invention relates to steam injectors and it has for its Object the provision of arrangements whereby the pressure of fluid in the delivery or discharge chamber or cone, utilized to hold the overflow valve closed after the water jet has been formed, is sub ject to the control of fluid intercepting or pressure reducing means such that premature closure of the overflow valve, due to pressure values in the delivery chamber or cone (hereinafter called the delivery cone) at starting, is prevented.

The invention further consists in providing certain novel combinations and arrange ments of parts all as hereinafter-more particularly described and claimed.

In the accompanying drawings, Figure 1 is a central longitudinal section of part of an injector illustrating the control of the overflow valve. Fig. 2 is a fragmentary view corresponding to Fig. 1, showing amodification. Fig. 3 1s a view similar to Flg. 1 illustrating a further modification. Fig. 4: is a central section showing the invention applied to an injector having re-starting means controlling the area of the steam nozzle, as described in the specification of my co-pending application Serial No. 556,123.

As shown in Fig. 1, the overflow valve 04 is formed with a hollow tubular stem 6 working through a substantially fluid tight guide 0 screwed into the body cl of the injector, the said guide being provided with a cap 0 serving, in conjunction with the guide 0, to form a fluid receiving chamber f and, alone, as the seat 9 for a loaded valve h (hereinafter called a controlling valve) having a stem 11 that works within the tubular stem b of the overflow valve. Conveniently, the controlling valve 72, may, as shown, be loaded by means of a compressed spiral spring surrounding its stem and bearing against the guide 0. The delivery or discharge chamber 70 of the injector, as in a known way, is formed with a lateral port or passage m, which is connected by means of a tube a, or equivalently, to a port or passage 9 passing through the seat 9 of the conbeen properly started and the controlling valve it opened, the pressure of the fluid entering the chamber f, assuming that steam is being supplied at a pressure high enough to cause such an opening of the controlling valve h, will act upon'the said spindle b and close the Overflow valve a if it has not already closed, or maintain it closed it closed, the controlling valve 72. remaining open so long as the injector is at work.

In some cases in lieu of the arrangement just referred to, the controlling valve might, as shown in Fig. 2, be omitted and the Overflow valve a be formed with one or more leakage passages a that lead to the overflow duct 0 and which is or are opened at some prearranged point during the openil'lg of the overflow valve, and remains or remain so, to prevent accumulation of pressure suflicient to close the overflow valve until the injector is at work, when the increased and continued.

pressure in the delivery chamber will, as before, act to close the overflow valve, if not already closed, and in either case maintain it closed. WVhen the valve is closed, the leakage passage or passages a to the overflow 0 will, as shown, also be closed.

In order to prevent the possibility of the pressure to which the fluid in the fluid receiving chamber 7 may have been raised, while the injector was at work, being main tained to oppose free opening of the overflow valve a on re-starting, the spindle b whereon the pressure acts to hold the valve closed, may, as shown in Fig. 1, be formed with leakage grooves 79 and the guide 0 with w a groove 6 which communicates through a passage 79 with a free outlet, say the water inlet chamber 6 of the injector; or the leakage fluid may be led to the over flow duct 0, as by allowing it to leak through the passages a In some cases the fluid may be conducted to the chamber 7 directly from the delivery cone of the injector, Figs. 3 and 4 showing such modification applied to injectors having no delivery chamber. Thus, in Fig. 3 the passage m leading to the chamber f extends directly from the delivery cone m. The controlling valve 70 may, as shown, be arranged in a separate intermediate chamber 7L A similar separate intermediate chamber may also be adopted in the case of injectors having delivery chambers as in Fig. 1. In Fig. 4 the overflow valve (0 and control valve h are arranged in substantially the same way as in Fig. l and the passage m leading to the chamber f is formed partly in the delivery tube 171 and partly in the portions (0, (Z of the body (Z, and in the cap 6.

respectively. The various parts of the passage m in each case (Figs. 3 and 4), severally communicate with annular grooves (Z in the contacting faces of the several elements referred to whichaare subjectto motion of rotation in fitting the injector, so that continuity of the passage m is at all times maintained.

WVhat I claim is 1. In a steam injector, the combination with an overflow valve, means for closing said valve, a fluid pressure chamber in communication with the valve closing means, and a connection for conducting fluid from the delivery of the injector to the pressure chamber, of a valve arranged to intercept fluid tending to pass from the delivery to the pressure chamber with momentary in crease of pressure in the delivery, prior to formation of the jet, to values equal to the maximum derivable after the formation of the jet.

2. In a steam injector, the combination with an overflow valve, and a chamber arranged to receive fluid under pressure from the delivery of the injector, of a plunger extending into said chamber, said plunger being connected to the overflow valve and provided with a passage to allow of leakage of 'fltiid'from said chamber.

8. In a steam injector, the combination with an overflow valve, a fluid pressure A chamber, and a connection for conducting fluid from the delivery of the injector to the pressure chamber, of a loaded valve arranged to intercept temporary passage of fluid to such chamber, and valve operating means influenced by the fluid pressure in the chamber and having leakage passages for the purpose specified.

t. In a steam injector, the combination with an overflow valve, of a fluid pressure chamber, a connection arranged to conduct fluid from the delivery of the injector to the pressure chamber, a loaded valve arranged to intercept passage offluid to such chamber, and overflow valve operating means arranged to be influenced by the fluid in the chamber and having leakage passages for the purpose set fort 5. A steam injector, comprising, in combination with a casing having an overflow chamber and an overflow valve therein, of a fluid pressure chamber in said casing, a connection for conducting fluid from the deliver 1 of the injector to the pressure chamber, a hollow plunger connected to the valve and extending into the said pressure chamber, and a loaded valve arranged in the pressure chamber to intercept passage of liquid to the latter and having a stem Working in the hollow plunger of the overflow valve, said plunger having leakage grooves therein and said casing having a co-acting leakage passage for the purpose set forth.

Signed at London England this sixth day of April 1910.

ROBERT GRUNDY BROOKE.

Witnesses H. D. JAMES/0N, R. F. lVILLIAMs.

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