US2225789A - Steam injector - Google Patents

Description

Dec. 24, 1940. R. D. METCALF'E ET AL STEAM INJECTOR Filed NOV. 28, 1939 Patented Dec. 24, 1940 UNITED STATES STEAM INJECTOR Richard David Metcalfe and James Croxon Metcalfe, Romiley, England, assignors to Davies & Metcalfe Limited, Romiley, England, a British company Application November 28, 1939, Serial No. 306,573 In Great Britain July 7, 1939 Claims. (01. 103-277) This invention relates to steam injectors of the type utilising a hingedly or pivotally mounted flap upon the combining nozzle, which opens at starting due to the pressure within the nozzle, to

5 allow of the free escape of the jet from such nozzle, and remains open until the jet at the delivery nozzle is established and is able to deliver into the boiler or other vessel being fed, when the flap closes automatically. Usually the combining nozzle is screwed upon the delivery nozzle and the latter screws into the injector body. It is found in practice that when the delivery nozzle has been unscrewed from the injector body in order to expose the nozzles and the flap for cleaning or. other purposes, the re-assembly of the nozzles in the body frequently results in the flap coming to a position other than directly above or at the top side of the combining nozzle and in consequence the flap does not function efficiently and may hang down in an open position when it should close to'complete the combining nozzle.

The object of our present invention is to provide a construction and arrangement of nozzles which enables the flap to be correctly positioned above the combining nozzle notwithstanding the extent to which the delivery nozzle may be turned when being screwed into the injector body.

The invention comprises mounting the combining nozzle, which has a hinged flap thereon, for circular movement around a cylindrical part of the delivery nozzle co-axial therewith, and providing a plurality of closely spaced tapped apertures in the end of the delivery nozzle parallel with the nozzle axis into which screws passing through the end of the combining nozzle can thread to secure the combining nozzle in a position in which its hinged flap is at the upper side of the combining nozzle notwithstanding any 40 change in the circular setting of the delivery nozzle.

Referring to the accompanying sheet of explanatory drawings:

Figure 1 is a longitudinal section of 'an exhaust steam injector with its combining nozzle secured in position in accordance with this invention.

Figure 2 is a sectional plan view of the combining and delivery nozzles substantially on the irregular line 2--2 of Figure 1, the flap upon the combining nozzle being omitted for the sake of clearness.

Figure 3 is a sectional end view on the line 3-3 of Figure 1.

Figure 4 is a sectional end view on the line 4-4 of Figure 2.

a indicates the exhaust steam inlet nozzle of the injector, b the water inlet cone, 0 the auxiliary exhaust steam inlet cone, d the combining nozzle and e, e the two parts which constitute the delivery nozzle. The part c is liable to wear relatively rapidly and is made readily replaceable. f is the hinged flap upon the combining nozzle which opens (to permit overflow from the combining nozzle) when the injector is starting up and closes automatically, due to the difference in pressure within the combining nozzle d (where the steam jet is being condensed by the water jet) and the overflow chamber a.

The delivery nozzle portion e is formed with a part c of reduced diameter which serves to receive and locate co-axially with the delivery noz- 1 Zle the flange like end al of the combining nozzle. The hinge pin h of the link i carrying the flap j is held in the hinge brackets 7' upon the part d of the combining'nozzle. The said part 11 has an internal flange at k which comes over an external flange at m on the delivery nozzle portion e and holds the latter in place in the delivery nozzle portion e.

There are two holes 0 through the end d of the combining nozzle d through which pass screws p which can be threaded into any diametrically opposite pair of the 12 tapped holes q in the delivery nozzle portion e. The latter screws into the injector body at r.

The end of the combining nozzle d adjacent to the cone 0 is guided in the cylindrical part s of the injector body.

When the assembled combining and delivery nozzles d, e, e have been removed from the injector for cleaning, inspection or other purpose 5 and the assembly has again been mounted in the injector by screwing the delivery nozzle e into the injector body at r, the flap I may be positioned otherwise than at the upper side of the combining nozzle, due to wear of the reassembled screwed parts at r or at the sealing face 15, or to other cause and this may result in the flap not functioning satisfactorily and therefore impairing the effrcient operation of the injector. To overcome this disadvantage, the screws p are withdrawn from the pair of holes q in which they are threaded, the combining nozzle turned in a circular direction upon the delivery nozzle portion e until the flap 1 is correctly placed upon the upper side of the combining nozzle, and the screws p threaded into the pair of holes q with which they are then in line. If the screws do not line up with any pair of screw holes, the combining nozzle is turned additionally to give alignment, but by reason of the large number of screw holes q, a small circular movement of the combining nozzle will cause the screws and screw holes to align.

What we claim is:

1. A steam injector comprising a casing, a steam inlet nozzle, a water inlet cone, a combining nozzle, a pivoted flap overflow valve upon said combining, nozzle, a delivery nozzle, said combining and delivery nozzles mutually interengaging in such manner as to permit of rotation of one relatively to the other without axial movement of either relatively to the other, and means to lock said combining and delivery nozzles together in any one of a plurality of different mutual angular settings.

2. A steam injector comprising a casing, a steam inlet nozzle, a water inlet cone, a combining nozzle, a pivoted flap overflow valve upon said combining nozzle, a delivery nozzle, a spigot connection between said combining and delivery nozzles interconnecting said nozzles in such manner as to permit of rotation of one relatively to the other without axial movement of either relatively to the other, and means to lock said combining and delivery'nozzles together in any .one of a plurality of different mutual angular settings.

3. A steam injector comprising a casing, a steam inlet nozzle, a water inlet cone, a combining nozzle, apivotedflap overflow valve upon said combining nozzle, a delivery nozzle, a spigot connection between said combining and delivery nozzles interconnecting said nozzles in such manner as to permit of rotation of one relatively to the other without axial movement of either relatively to the other, and means to lock said combining and delivery nozzles together in any one'of a plurality of different mutual angular settings, comprising a plurality of threaded holes in the end of one of said combining and delivery nozzles, and at least one screw carried by the other of said combining and delivery nozzles and adapted selectively to enter said holes.

4. A steam injector comprising a casing, a steam inlet nozzle, a water inlet cone, a combining nozzle, a pivoted flap overflow valve upon said combining nozzle, a delivery nozzle having a co-axial cylindrical part of reduced diameter free from screw threads at its inlet side, a cylindrical recess free from screw threads in the end portion of said'combining nozzle which receives said cylindrical part, a ring of threaded holes in the end of said delivery nozzle surrounding said cylindrical part and a plurality of screws extending from the end of said combining nozzle and adapted to enter said threaded holes selectively according to the relative angular relationship of said combining and delivery nozzles and to clamp them together.

5. An exhaust steam injector comprising a casing, a steam inlet nozzle, a water inlet cone, an auxiliary steam inlet cone, a combining nozzle, a pivoted flap overflow valve upon said combining nozzle, a delivery nozzle having a coaxial cylindrical part of reduced diameter free from screw threads at its inlet side, a cylindrical recess free from screw threads in the end'portion of said combining nozzle which receives said cylindrical part, a ring of threaded holes in the end of said delivery nozzle surrounding said cylindrical part and a plurality of screws extending from the end of said combining nozzle and adapted to enter said threaded holes selectively according to the relative angular relationship of said combining and delivery nozzles and to clamp them together.

RICHARD DAVID METCALFE. JAMES CROXON METCALFE.

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