US614752A - Injector - Google Patents

Description

No. 6l4,752. Patented Nov. 22, I898. W. R. PARK 8:. B. T. WILLISTON. INJECTOR.

(Application filed Aug. 2, 1898.) (ModeL) 2 Sheets-Sheet l.

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No. 6l4,752. Patented Nov. 22, I898.

W. R. PARK 81. B. T. WILLISTON.

' INJECTOR.

(Application filed Aug. 2, 189B.) M odal.).

Z Sheets--Sheet 2 WITNESSES NITED STATES PATENT Futon.-

I/VILLIAM R. PARK, OF TAUNTON, AND BELVIN T. WVILLISTON, OF SOMER- VILLE, MASSACHUSETTS, ASSIGNORS TO THE HANCOCK INSPIRATOR COM- PANY, OF BOSTON, MASSACHUSETTS.

INJECTOR.

SPECIFICATION forming part of Letters Patent No. 614,752, dated November 22, 1898.

Application filed August 2, 1898. Serial No. 687,495. (Model) To all whom it may concern:

Be it knownthat we, WILLIAM R. PARK, a resident of Taunton, county of Bristol, and BELVIN T. WILLISTON, a resident of Somerville, county of Middlesex, State of Massachusetts, citizens of the United States of America, have invented certain new and useful Improvements in Injectors, of which the following is a specification.

This invention relates to boiler feed-injectors wherein the final overflow or waste valve is operated by connections with the mechanism by which the steam-admission valve of the injector is controlled, and has for its object the provision of a simple and effective contrivance whereby the overflow-Valve connections maybe independently manipulated.

Injectors are often used to heat the feedwater by blowing steam back through the suction-passages. Ordinarily in injectors of the class described this blowing-back action is secured by an abrupt full opening of the main steam-valve, the movement of the valveoperating handle being purposely made so sudden as to close the final overflow-valve through its connections with the steam-valveoperating mechanism before suificient op-' portunity has been afforded for the formation of a jet within the tubes of the injector. The steam then follows the path open to it through the chambers of the injector-casing to the suction-pipe and feed-water tank, heating the waterin the tank. This necessitates, first, a full opening of the steam-valve, which in itself may not be necessary or desirable, and, further, involves a sudden, forcible, and jarring movement, which tends to strain or inj ure the overflow-valve and its connections. By the invention here described means are provided whereby the final overflow-valve may be independently closed, leaving the steam-valve free to be opened, either slightly or wholly, as the operator may desire. We

also provide means whereby after disengagement from the steam-valve-operating mechanism the overflow-valve connections are automatically restored to their normal condition of engagement with the steam-valveoperating mechanism.

The inventions and improvements herein described are shown in the drawings annexed to this specification as applied to an injector or inspirator such as is shown and described in United States Letters Patent No. 492,944., issued to W. R. Park and B. T. lVilliston March 7, 1893, to which patent we refer for a full description of the inspirator and its operative parts. The herein-described improvements are applicable, however, to injectors of types other than that shown and described in the said patent.

In the drawings hereto annexed, wherein like letters are uniformly used to designate like parts, Figure l is a longitudinal elevation and part section of an injector provided with the herein-described improvements, the overflow-valve connections being shown in their normal condition of engagement with the steam-valve-operating mechanism. Fig. 2 is a similar view of the injector shown in Fig. 1, showing the overflow-valve connections disengaged from the steam-valVe-operating mechanism; and Fig. 3 is a detail showing more particularly a form of connectingrod by which the overflow-valve is operated.

A is the injector-casing, shown in part section, so as to disclose the final overflow-Valve O and its seat 0. The steam admission valve (not shown in the drawings) is operated by a handle H, which is mounted on the in jector-casing by a pivot-and-link connection h h 71. The stem of the steam-admission valve is shown at V and is pivoted to the handle-lever H at o. The overflow-valve connections consist of the valve -stem 0 which passes through the stufiing-box 0. The valve-stem O is connected to a bell-crank lever L L by means of a short link L, the bell-crank lever being pivotally secured at Z to a standard S, mounted on the injectorcasing. The arm L of the bell-crank lever has pivotally connected therewith a rod R, which is connected also with the handle-lever H of the steam-valve-operating mechanism. This lever 11 has secured to it a stud B, which serves as one member of the connection between the rod R and the steam-valve-operating mechanism. The rod R is removably secured in its relationship with the steam-valveoperating mechanism in the manner follow- I00 ing: A notch N, open at one side of the rod R, is formed in the rod and is so shaped as to provide a secure seat for the stud B. The rod R, which is pivoted to the bell-crank lever L L at R has for convenience a projection or handle R, whereby the rod B may be lifted out of engagement with the stud The rod is then free to be moved independently of the steam-valve mechanism, and by this movement the overflow-valve 0 may be closed.

In Fig. 2 the rod R is shown disengaged from the stud B and withdrawn to the position of overflow-valve closure,the steam-valve remaining closed. Vith the parts in this position the injector is ready to be operated as a heater.

In order to restore the several described parts to their normal condition of operative engagement, a guiding-surface G is formed near the end of the rod, the said guiding-surface G being so arranged in proximity to the notch N that the stud B by a full outward movement of the steam-valve-operating mechanism automatically slides into its normal engagement with the notch N. hen, therefore, the steam is shut off by a return movement of the handle II, the restored connection between the steam-valve-operating mechanism and the overflow-valve mechanism causes the overflow-valve to open and places the injector in its normal condition of readiness to operate as a boiler-feeder.

In order to insure the automatic restoration of the several parts to their normal condition of connection and at the same time to leave them free to be disconnected at the will of the operator, a spring-guard is provided whereby the stud B and notch N are forcibly urged into mutual engagement whenever by the movement of the operative parts they are brought into proper relationship. A convenient and practical mode of attaching and adjusting this spring-guard is shown in the drawings, reference being made especially to Fig. 3. A stout leaf-spring E is secured to the rod R at E and lies opposite the notch N and guidingsurface G. This spring E is adjusted so as to exert its bias against the stud 13, holdin g the latter into engagement with the notch N with sufficient firmness to prevent the two parts from accidental disengagement by accident or jar. At a point opposite the free end of the spring E a shoulder E is formed on the rod B. This shoulder E constitutes a hearing for the free end of the spring E and prevents the latter from being unduly distorted when the rod R is lifted out of engagement with the stud B. lVhen the rod R is in the position shown in Fig. 2 and the steam-valve handle II is moved outward, the stud B, sliding over the surface G, slips over the spring E until the notch N is reached, when the spring instantly snaps the two partsnamely, the rod and stud-into engagement.

The spring E may be dispensed with, and

the rod R, arranged as shown, will by its own weight restore itself to normal relationship with the steam-valve-operating devices; but when the injector is used in situations where it is liable to be jarred, as on a locomotiveengine, the spring arrangement will be found desirable.

What we claim, and desire to secure by Letters Patent, is-

1. In an injector, the combination of the following parts: a steam-admission valve, mechanism for operating the said steam-valve, a final overflow-valve, mechanism for operating the said overflow-valve comprising a rod which connects the steam-valve-operating mechanism with the final overflow-valve, the said rod provided with a notch adapted to engage with the steam-valve-operatin g mechanism whereby the overflow-valve connectingrod may be removed from engagement with the steam-valve'operating mechanism and the overflow-valve independently operated, substantially as described.

2. In an injector, the combination of the following parts: a steam-admission valve, meclb anism for operating the said steam-valve, a final overflow-valve, mechanism for operating the final overflow-valve comprising a rod which connects the steam-valve-operating mechanism with the final overflow, a stud attached to the steam-valve-operating mechanism, a notch in the overflow-valve connectingrod adapt-ed to engage with the said stud, a guiding-surface on the rod adjacent to the notch-opening whereby the notch and stud are automatically slipped into engagement, substantially as and for the purposes described.

3. In an injector, the combination of the following parts: a steam-admission valve, mechanism for operating the said steam-valve, a final overflow-valve, mechanism for operatin g the final overflow-valve comprising a rod, which connects the steam-valve-operating mechanism with the final overflow-valve, a stud attached to the steam-valve-operating mechanism, a notch in the overflow-valve connecting-rod adapted to engage with the said stud, a guiding-surface on the rod adjacent to the notch-opening, whereby the notch and stud are automatically slipped into engagement, a spring secured to the said rod, the said spring being adjusted and adapted to urge the stud into engagement with the notch, substantially as and for the purposes set forth.

4. In an injector, the combination of the following parts: a steam-admission valve, mechanism for operating the said steam-valve, a final overflow-valve, mechanism for operating the final overflow-valve comprising a rod, which connects the steam-valve-operating mechanism with the final overflow-valve, a stud attached to the steam-valve-operating mechanism, a notch in the overflow-valve connecting-rod adapted to engage with the said IEO stud, a guiding-surface 0n the rod adjacent ited, substantially as and for the purposes set I0 to the notch-opening, whereby the notch and forth.

stud are automatically slipped into engage- Signed by us at Boston this 27th dayof July, Inent, a spring secured to the said rod, the A. D. 1898.

5 said spring being adjusted and adapted to WILLIAM R. PARK.

urge the stud into engagement with the BELVIN T. WVILLISTON; notch, and a guard on the said connecting- Vitnesses: rod in the path of movement of the said spring ODIN B. ROBERTS,

whereby the movement of the spring is lim- E. F. GROLL.

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