US1329465A - Injector - Google Patents

Description

' 1., J. C. AND R. D! METCALFE.

INJECTOR.

APPLICATION FILED JULY 8. 1919.

1,329,465 Patented Feb. 3,1920.

Inventors JMebcaZI'e JCJIIetcaLfe "*v RJlZI Ietcalfe U ITED STATES PATENT OFFICE.

JAMES METCALFE AND JAMES CROXON METCALFE, 0F MARZPLE, 'AND RICHARD DAVID MIiI'IGALIEIEl, OF ROMILEY, ENGLAND.

INJECTOR.

Specification of Letters Patent.

Patented Feb. 3, 1920.

Application filed July 8, 1919. Serial No. 309,310.

To all whom it may concern:

Be it known that we, JAMES METCALFE and JAMES CRoXoN METOALFE, both of Sheen Bank, Marple, in the county of Chester, England, and RICHARD DAVID METGALFE, of the Mount, Romiley, in the county of Chester, England, subjects of the King of Great Britain and Ireland, have invented certaln new and useful Improvements in Injectors, of which the following is a specification.

This invention relates to steam injectors and has for its object to provide improved means for controlling the overflow from the injector when the latter is starting. 7 Y With injectors dealing with hot feed water and high pressure steam, difliculty is experienced in obtaining a sufficiently free overflow at starting to permit of the quick establishment of a proper condensed steam jet in the combining nozzle having the necessary velocity to deliver into the boiler or vessel being fed. In our prior Patents Nos. 905206 and 1,194,207, we have proposed to divide the overflow chamber around the combining nozzle into two compartments each With its own overflow valve, and to load the valve adjacent the delivery end of the combining nozzle by the pressure in the delivery chamber of the injector. Under certain conditions, we have found that this construction will not enable the overflow to escape sufficiently freely to permit of the ready establishment of the condensed steam jet and the normal operation of the injector. The difiiculty of starting the injector is further accentuated by steam which may leak into the injector past the steam control valve or water which may leak into the injector past the delivery or back pressure valve, so heating the feed pipe and causing an accumulation of hot water therein, so that the said water evaporates when the pressure on its surface is reduced by the action of the steam jet issuing into the combining nozzle and the water is not readily lifted.

The object of our present invention is to Referring to the accompanying explanatory drawings Figure 1 is a sectional elevation of an injector constructed in accordance with our invention.

Fig. 2 is a detail cross sectional view the line A B of Fig. l.

The injector comprises a steam inlet nozzle a, known as the lifting nozzle, and acentral steam nozzle 44, known as the forcing nozzle, a water cone Z), a combining nozzle divided into two parts 0, d and a delivery nozzle 6. Steam enters at and water at g, the steam upply to the injector being controlled by a steam valve having a stem part it which enters within the forcing nozzle a, and a part i which controls the admission of steam to the nozzle a. The

can be locked in its closed position for feed water heating purposes by the screwed spindle t as in Patent N 0. 1194207. I

There is a water inlet valve u to the compartment 7a which works automatically ac cording to the difference in the pressures at its opposite sides, but the water supply to the said valve may be cut off by the hand operated valve 1).

Upon the overflow compartment m we provide a second overflow valve to held on its seat by gravity or a spring :22 but actuated by a cam 3/ upon a spindle z. The lat ter carries a crank arm 3 which, by means of a connecting rod 4 is detachably attached to a projecting pin 5 on the arm 6 pivoted at 7 which actuates the steam valve.

With the arrangement before described, at starting, the lever 6 is operated to open the valve part 2'. The overflow valve to is then held off its seat by the cam y so that overflow can take place not only through the valves 0, p but through the positively opened valve 4/). This greatly facilitates the starting of the injector. A. further movement of the lever 6 opens also the valve portion h but it then allows of the closing of the valve to so that the overflow is then controlled entirely automatically by the pressure in the delivery chamber on the valve 1?.

The valve to is always fully open when the steam valves 72., i are closed so that any leakage past the said valve can escape freely to atmosphere.

If it is desired to preheat the feed water the valves 0 and p are held closed by the locking spindle t and the connecting rod A is disconnected from the pin 5. WVhen the steam valve is opened, the steam passes down the feed pipe and warms the feed water supply.

Having now we claim as new and ters Patent is 1. In injectors, in combination, lifting and forcing steam inlet nozzles, a combining nozzle, a delivery nozzle, an overflow chamber divided into two compartments, each having communication with the interior of the combining nozzle, a delivery chamber, a steam control valve having portions control ling the steam supply to the lifting and the forcing steam nozzles, a water inlet, automatic overflow valves upon each of said described our invention what desire to secure by Let- 'overflow compartments, a lever controlling one overflow valve and loaded by the pressure in said delivery chamber, a positively operated overflow valve on the compartment having the lever loaded valve thereon, and means foropening said positive overflow valve when both the steam valve portions are shut or the lifting portion only is open, and insuring the closing of said overflow valve when both the steam valve portions are fully open, as set forth.

2. In injectors, in combination, lifting and forcing steam inlet nozzles, a combining nozzle, a delivery nozzle, an overflow chamber divided into two compartments around the combining nozzle, a delivery chamber, a steam control valve having portions controlling the steam supply to both the lifting and the forcing steam nozzles, a water inlet, au-

tomatic overflow valves upon each of said overflow compartments, a lever controlling one overflow valve and loaded by the pressure in said delivery chamber, a positively operated overflow valve on the compartment having the lever loaded valve thereon, a lever operating the steam valve, a cam operating when both the steam valve portions are fully open, as set forth.

3. In injectors, in combination, lifting and forcing steam inlet nozzles, a combining nozzle, a delivery nozzle, a compartmentally divided overflow chamber, a water inlet, automatic overflow valves upon said overflow compartments, a delivery chamber, a lever controlling one overflow valve and loaded by the pressure in said delivery chamber, an extension piece attached to said lever and controlling the other overflow valve, a locking member for said extension piece, a water inlet to the overflow compartment adjacent the inlet end of the combining nozzle, means for positively cutting off said water inlet, a steam control valve having portions controlling the steam supply to both the lifting and the forcing steam nozzles, a positively operated overflow valve on the overflow compartment adjacent the delivery end of the combining nozzle, a lever operating the steam valve, a cam operating the positive overflow valve, and a connecting rod providing anoperative connection between said steam valve lever and cam, as set forth.

In testimony whereof we have signed our names to this specification.

JAMES METCALFE. JAMES CROXON METOALFE. RICHARD DAVID METCALFEJ

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