US1119581A - Nozzle-plug. - Google Patents

Description

A. R. DODGE.

NOZZLB PLUG.

GATION FILED Nov.

Patented Dec. 1, 1914,

APPL

v Inventor* I .JCTuStin RDod Fipjl.

Witnesses:

UNITED sTATEs y f-Frr AUSTIN R. DODGE, 0F SCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, AVCORPORATION OF NEW YORK.

- NOZZLE-PLUG.

specification of Letters rate'n'z.

Patented Dec. 1 1914.

yeter, and has for its object to improve their construction, particular reference be.- ing made to the means for compensating for expansions and contractions due to temperature changes, to supporting .the plugs at their inside ends, to limiting the pressure difference created thereby for iuids How/ing at high velocity, and to means for freeing the plug of dirt and other foreign matter.

In the accompanying drawing, which is illustrative of my invention, Figure 1 is a longitudinal section of a plug showing the parts arranged to slide on each other to compensate for tem erature changes; Fig. 2 is a cross-section ta en on line 2-2 of. Fig. 1; Fig. 3 is a partial axial section of a high velocity plug; Fig. 4 is a cross-section of the same; Fig. 5 is an axial section of a modified form of sliding connection between the inner and'outer parts; Fig. 6 is a cross-section of the same; and Fig. 7 is a detail view showin means for blowing foreign matter outvof t e plug.

10 indicates the main through which the iuid to be metered iows. It may be liquid, air, steam, or other vapors. 4

11 indicates the base of the nozzle plug which is screwed into a .tapped hole in the main. It is provided with a squared head 12 to receive a wrench. In the head are four screw-threaded ports or openings of which 13 and 14 are arranged in one pair and 15-and 16 in another. `The openings 13 and 15 are connected by passages to the oriiices in the nozzle plug which face the moving column of liquid and are commonly referred to as the leading or high pressure openings. The openings 14 and 16 are connected to the rear and side orifices of the nozzle plug and the moving column of liquid in passing the plug tends to create a suction eifect therein. These'y are commonly referred to as the low pressure or trailing openings. The plug can be adapted for service in a main Where the How is yfrom right to left, .or left to right, or up or down. F urther, the pipes 17 and 18 connecting the plug with the'manometer should be in the same horizontal plane to insure equal Water columns above the mercury. To provide for this and to insure the orifices in the plug facing in the proper direction, the additional set of openings 15 and 16 is provided. As shown, the meter, manometer, or other device, is connected to the plug by the pipes 17 and 18, each containing a shut-off valve 19. If the direction of the iuidwas downward, as in a vertical pipe, the manometer would be connected by the pipes 21 and 22, each 'having a shut-olf valve 23.

Formerly it was the practice to plug up the holes or ports not in use, but I have discovered that they can. be utilized in cleaning the nozzle plug of foreign matter. Assuming that the manometer or other device is connected to pipes 17 and 18,- thepipes 21 and 22 are screwed into the openings-15 and 16 and the valves 23 closed. Under these conditions the meter will work in the ordinary manner. Assuming now that it. is desired to clean the plug, instead of shutting down the system and taking the plug out of the main I first shut the valves 19 to prevent the mercury in the manometer from being driven but, and then'open the valves 23 and permit fluidI to be discharged into the atmosphere through the plug under the full pressure of the main. This will carry out any foreign particles which may be lodged in the various passages in the plug, after which the valves can be closed and the normal operation of the meter will be resumed. As an additional cleansing means the screw plug 24 is provided and located in line with the tubular member 28 in the center of the plug. By removing the screw plug access mav be had to the interior of said member.

The base 11 of the nozzle plug is purposelyv made quite large and is provided with radiating iins'24 to facilitate the condensation of vapor in the passages in Vthe plug. [They will be unnecessary where air or water is being metered, but since it is preferable to use a standard construction as far as possible for all purposes they .may be retained. The base is counter-bored to receive the orifice tube 25, which vextends perpendicular to the direction et tlow et the iiuid. ln order to obtain the best ei2m ects it should extend substantially across 'the main so that the average velocity of the fluid stream, instead ot that at any given point, will be utilized. lWhere the mains are small in diameter it is entirely satisfactory to support the tube from the base only, but where the main is large as is lthe case tor water, these tubes may be d to i it. longs or even longer, and it becomes necessary to support them at their inner ends. This is accomplished by drilling and tapping the main l@ in line with the plug` and inserting; therein a screw-threaded supporting piece 2@ that makes a reasonably goed t with 'the bore of the orilice tube. 'lhe arrangement between the support 26 and the tube 25 should be such that the tube is free to er:n pand and contract with temperature changes without restraint from the part 26. llhen used with steam the support 26 has suitable drainage openings 26, shown in dotted lines.

rl`he tube 25 is provided with a plurality of oriiices 2'? which face the moving column of fluid. lhese are distributed subst-antially over the entire length ot the tube and in the same plane so that the average impact ot the Huid will be obtained as distinguished trom the impact at one point only. Screwthreaded to the lbase and located inside ot the orice tube is a tubular member 28 et rather small diameter. This is in turn surrounded by a sleeve 29 and between the sleeve and tube is a small :annular space through whichthepressure, due to the impacty orifices 2'?, is conducted to the cham ber 30, the latter communicating with the leading pipe l? connected to the manometer. ln order to preserve the proper relation be tween the outer end of the sleeve 29 and the tube 25, spacing devices are provided. ln Fig. l they are shown in the torni ot pins 3l carried by the sleeve and having; rounded heads in engagement with the orice tube. Generally three or tour ot these pins may be provided. An alterna tive arrangement of the spacing device is shown in Fig. 3 wherein the upper end oi the sleeve 29 is split at a suitable number et places, say three tor example, and the little tongues 32 thus termed are bent outward into engagement with the inner wall of the orifice tube.

Referring now to the low pressure or trailing side et the device, the tubular member 28 is screw-threaded into the base and at its upper end is provided with a head or block 35 which contains a chamber 86 and one or more small passages 36 communieating with trailing orifices in the tube 25 'lhe head Aor bloclr may be secured to the member in any suitable manner5 as, for en ample, by screw threads.. From practical ser experience l have tound that usarle plugs of this character sometimes brealr in the region ofthe block when subjected to steam. This is occasioned by the admission oie. relatively cold water to the inner member 28 :trom the pipe i7 and its usual connected reservoir. 'lhe entrance ci? water to said member has the edect ot chilling it and thus causing it to contract. the other hand, the orifice tube is still subjected to heated vapor and retains its elongated term. lt the bloch 35 is directly fastened to the orice tube something will have to give it the dilerence in expansion ol' the parte is great. will either strip the threads old et the member 28 or brealr the pins or other connection between the bloclr and the tube. l have discovered that this objectionable feature can be avoided in a very simple manner and at the same time the proper pressure conditions between the leadinen and trailing sides preserved. rlhe sliding' block is drilled with as many holesas it is desired to have trailing openings through the critico tube. lnto each orn these holes is screwed hollow pin 38. its' shown in the gures, three hollow pins are shown.` the opening in each pin communicating with a passage 36 in the bloclr. lnstead of making the holes in the orinee tube for the pins or the same diameter l make them larger and in the torni of slots 38- so that the block orihce tube .can move with respect to each other without shearing oli? the pins. The bloclr should be long enough7 measuring? 'in an axial directions to cover the slotsand preventv kthe impact pressure lfrom bypassing into the trailing, low pressure or suction oriices7l thereby decreasing1 the pressure ditterence, it being remembered that the pressure within the tube 25 is greater than in the chamber 36 in the bloclr 35. lt is, howeverj necessary topermit iluid under pressure to pass through the tube trom the top to the bottom of the block and to this end the bloclr is provided with a number ot grooves 39 'formingl passages which permit tree communication between the chambers above and below it.

instead el screwing the pins Bdinto the head or block and slot-ting the orihce tube, the arrangement shown in ligs i and il can be employed. ln these ligure: the block or head 35 is no longer centered and guided by the inner wall of the oritice tube as it is smaller in diameter than its bore. Il" obtain the 'same edect, however, as in the cunstruc-` tion shown in liig. l by mounting on the outside oil the orice tube a ring; d0, said ring being connected with the block by hollow pins 38 that extend through the slots 38 in the tube 25, As the tubular member 28 expands and contracts, the block 35 will move up and down' within the. tube 25 with-v outdisturbingg:it9 and since the slots 38' liti ltlti lll@ niiaaei are covered by the ring leakage rc'im one set of orifices tothe other will be avoided.

For a majority of the cases, the construction heretofore illustrated will be entirelyv satisfactory", but there are conditions where the velocity of the fluid in the pipe is very high and a` nozzle plugof the type described will give too great a pressure difference for the manometer; that is to say, the pressure difference will be so great that it will either force mercury out oi? the manometer, or move it to a region outside of the normal. To provide for a condition of this hind, in` stead of having two side'openings and one rearwardly opening passage 362 asin Fig. 2, the parts are so arranged that there are one forwardly opening passage i1 and two side opening passages 38 as before. rlhe eect of the passage 41 facing the moving column of fluid is to somewhat increase the pressure of the uid from the side opening passages 36", the pressure actuallyfentering the tubular member 29 being a resultant ofthe pressures in the' three passages. The net eiiect of this is to decrease the ressure di'erence in the pipes 17 and 18 leading to the manometer. For example, for a given ow,-with the passages in pins 38 arranged as in Fig. 2, the'mercury deflection in the manometer may amount to 1%. Under the same condition, if the arrangement-shown in Fig. 4 is employed, the mercury deflection will only be about 1.

1n accordance with the provisions of the patent statutes, 1 have described the principle of operation of my invention, together with the apparatus which 1 now consider y.ton

represent the best embodiment thereof; but l desire to have it understood that the apparatus shown is only illustrative and that the invention can be carried out by other meDS.'

What l claim as new and desire to secure by Letters Patent ofthe United States, is

1. In a nozzle plug, the combination of a base containing passages and adapted to be attached to a 'uid carryin main, an orifice tube supported thereby an communicating with one of said passages, a tubular member also carried by the base and located inside of the tube and communicating with another of said passages and a block `carried by the -member that is movable independently ,of the tube, said block having one or mle orices registering with those in the i 2. In a nozzle plug, the combination of a base containin passages and adapted to be A'attached to a uld carrying main, an orifice tube supported thereby and communicating with one of said assages, a tubular member also carried by t e base and located inside of the tube and communicating with another of said passages, and a block carried by the member that is movable independently tube supported thereby and communicating with one of said passages. a tubular-member also carried by the base and located inside of the tube and communicating with another of said passages, a block carried by the tubular member and containing a passage in' com- -rnunication with that in said vmember, and

means that are mounted on one of the parts and convey iuid under pressure from the4 outside of the orifice tube 'to said member, said means also serving to prevent the block from turning within the orifice tube.

4.-. In a nozzle plug, the combination of a base containing passages and adapted -to be attached to a fluid carrying main, an orifice tubesupported thereby and communicating with one of said passages, a tubularv member also carried by the base and located inside of the tube and communicating with another of said passages, a sleeve that surrounds said member and is separated from it and -the orifice tube by annular spaces, means for centering the sleeve within the said tube, and a block carried by the member which communicates with the region outside of the tube, said space and tubular member communicating with the passages in the base. 'p

5. 1n a nozzle plug, the combination of a base containing passages and adapted to beattached to a Huid carrying main, an orifice 4tube supported thereby and communicating in across it, said plug creating lapressure di erence that varies with changes in the rate of `flow of duid in the main, and a device screw-threaded into the main on` the side opposite the base which is in telescopic relation with and holds one end of the tube against 'deectiou 7. 1n combination, a nozzle plug compris# ing a base havin passages and adapted to be secured to a uid carrying main, an orilice tube mounted on the base and extendingl y across the main, a device carried by the v side of the main opposite the base for hold- `lng one end of the tube against deection,

8. ln a nozzle plug for high velocities, thev combination'ot a base, an orifice tube carried thereby,'the orifices in said tube being adapted to face the moving column of iiuid,

a means carried by the base and containingl orifices subjected to the suction effects of the column of fluid, and a passage that faces the moving column of uid and acts to partially neutralize the pressure diiterence due to the action oi the orifice-tube and means.

.9. ln a nozzle plug for high velocities, the combination of a base, an orifice tube carried thereby, the oriices in the tube being adapted to face the moving column ot uid, a tube carried by the base, a block carried thereby and containing passages subjected to the suction egect of the moving colunfin of fluid, and a passage that is subjected to the impact .of the fluid and is connected to the hrst named passages to partially neutralize the suction effects of the column of iuid.

10. In a nozzle plug for high velocities, the combination ot a base, a tube mounted thereon having orifices which are adapted to face the moving column of fluid, a tubular member also carried by the base and located inside the tube, a block mounted on the outer end et the member and containing a chamber, hollow pins :mounted in the block and conveying huid pressure to the chamber,

one of said pins being. subjected to the impact ot the mowing column of fluid and the remainder to the suction eect thereof.

11;. lin a nozzle plug, the combination ota base, an orice tube carried thereby which is provided with slots, a hollow member secured to the -base and located inside the tube, a block mounted on the member and in sliding contact with the tube,the1e being passages through the block to equalize the Huid pressures on opposite sides thereof, and screw-threaded hollow pins mounted in the block and movable in said slots.

. 12. lln combination, a main, a nozzle plu comprising a base mounted on the main an containing .passages arranged in pairs, means carried by the base for creating a pressuie di'erence responsive to changes in the rate ot oW of Huid throughthe main and conimunicating with said passages, pipes connected to one pair ot passages tor conveying Huid pressure to the point ot utilization, and valved pipes connected to the other-paixl vof passages through which Huidl can be discharged trom the main to clean said nieans of foreign -matter.

ln Witness whereof, l have hereunto set my hand. this 15th day of November, l9l3.

Witnesses: w

Bassanini B. laluna, Maaaaan'r l. lldcotnit.

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