Патент USA US2408604код для вставки
Oct. 1, 1946. R. _c. BRAIT‘HWAITE ETAL - 2,408,603 MECHANICAL RELAY OF THE FLUID JET TYFE Filed‘ Oct. 9, 19,45 ' INYENTOBS ' ATTORNEYS Patented Oct. 1, 1946 2,408,603 4] * ‘UNITED STATE S PATENT; OFFICE.‘ ~ MECHANICAL RELAYVOF Timrwm JET TYPE ; . Robert Cecil Braithwaite and Kenneth Wilcox- ' Manchester, England, assignorsto Metropoli- } 'tan-Vickers Electrical Company Limited,vLon'’ (don, England, a company of Great Britain - ' " ‘ Application 0ctober‘9,’ 1943, Serial No. 505,708. . " . InIGreat Britain May 28, 1940 ' 4Claims. (01.137-111) 1 This invention relates to mechanical relays. of ' ‘ , V, . r y r A which in?uence is to re-centralize the nozzle from which the jet issues.’ These defects have been alleviated by the present invention in which the control is e?ected by varying the quantity of ?uid ‘ A relay of the type referred to ‘. comprises'a nozzle to; which ‘air or other‘?uid is" continuously supplied; ‘usually, at constant pressure‘, "_ and an‘ ‘othernozzle' or other ori?ce which receivesf?uid which enters the receiving nozzle by means which, for certain particularly delicate types of mech anism, is‘mostfconveniently in the form of a third from‘ the “jet; issuing from Ithe'l ‘aforementioned or ‘controlling nozzle mounted in a novel manner nozzle, ‘ The. nozzle and ori?ce'i'areusually enj closed in, a i'c'asing having -2 possibly also to eddy currents, the tendency of the reaction imposed upon the controlling mem v _ ‘ from the end face of the receiving nozzle, and the?uid jet type and has for‘ its, object to reduce ber of the relay.‘ ’ which avoids disturbing or objectionable reac outletjport ‘jan'd ‘ sometimes provided ‘with "1 means whereby'the tion thereon; ‘7 ' "According to the present invention the reac 'pressurejwithin the casing may be controlled. tion of the, ?uid jet issuing from the supply noz .: l‘In certain applications "of mechanical relays, and particularly ‘?uid jet type.re1ays it is'are 15 zle upon the controlling memberis reduced to a_ quirement that the controlling'force or‘ torque very smallvalue withoutiloss of controllingaccu-' ‘for initiating frelay' actions'hall beja minimum for, in other words,_ that vthe're‘shall be the least possible reaction 'f'r’om‘the ?uid jet ‘issuing from rithejsupply" nozzle uponthe controlling device or racy by deflecting said jet ‘from alignment with v the receiving ori?ce by means of another jet the‘ measuring device in order to minimize dis‘ turbance of the force'which effects'co'ntrol. For ‘example the measuringdevic‘e maybe a Bourdon which is supplied from a movably mountedvde 20 ?eeting or controlling-nozzle so as variably to ‘(tube or vaneroid'barometery 'In the known relays for the type ‘referred to the‘lreaction 'on the con trolling member ‘has been'kept su?icientlylow for certainuses by'causing the measuring or ‘con ‘trollingdev'ice'either to de?ect the axis or the nozzle which is‘ supplied with ?uid whereby the jet ‘of ?uid'impingeslto 'ag'reatenor less extentv upon the stationary vreceiving‘orifice, or in an other arrangement the nozzle and receiving ori ?ce are, relatively ?xed and the control is effected by means of a vane or ba?le which is variably in impinge upon the main jet of ?uid issuing from the supply nozzle. -Reaction from the ?uid jet issuing from the supply nozzle upon the jet from the de?ecting or controlling nozzle 'is minimized by mounting the de?ecting nozzle to move about an axis which is so disposed with respect to the direction of e?iux from the supply nozzle that this eil‘lux produces no torque of the de?ecting , nozzle aboutit‘s‘axisof movement. ‘A graduated control of-t'he'mainljet between 'the supply andireceiving nozzles by the de?ecting jet may be attained either by shaping the de?ect ing or controlling nozzle so that it gives a fantail ?ow for which purpose this nozzle may have a terposed in the ?uid jet. The ?uid variably re 35 ?attened or slit-like ori?ce, or by using two jets impinging upon one another in the manner used ceived by the receiving ori?ce may actuate for in certain forms of acetylene gas burners for , example, a piston 'or bellows member which in illumination. turn may e?ect control of some other apparatus. In certain applications of a relay embodying‘ It has been discovered that in the case of the movable jet type of relay the aforesaid reaction 40 the invention it may occur that the necessity for having the minimum reaction on the measuring is still too high for. certain uses of the relay and this has been found to be due to the fact that the device only arises over a certain range of move ment of that device, for instance very near to its normal zero position, while major de?ections may ing a vane or baiile type of control it has not been 45 occur under initial starting or abnormal condi jet of ?uid tends to bring the jet back into align ment with the receiving ori?ce. Also when us found possible su?'iciently to reduce the reaction tions, when much greater reaction is relatively by designing the shape or nature of the vane or baiile to remove the reaction whilst obtaining re liable results. It has been found in practice that in either of said types of relays, and more particu; 50 unimportant. According to a feature of the in vention, therefore, the control nozzle may also larly in the type employing a. tilting nozzle from which the jet issues, a false and undesirable load is imposed on the delicate instrument tilting such nozzle, or moving the vane interposed in the ?uid carry a vane or ba?le which normally does not come within the ?eld of the main jet but with large de?ections is brought into action and then assumes control of‘ the main jet. In carrying out the invention the direction of axis of ' the controlling nozzle may be at right jet, due it is believed, to reboundingloi the ?uid 55 angles to the axis or the main Jet and movable “2,408,603 4 the ?xed nozzle I to the ?xed nozzle 2. At II is represented in dotted lines the fan-tail jet ob tained by ?attening the nozzle 4 as at 4*‘ in Fig. 2, and at I2 is shown the added vane, which may be soldered to the movable nozzle 4 and which is particularize‘d by the shaped edge I2a such that about an axis which is parallel with the main jet, or which is at right angles to the axis of the main jet, in which latter case the controlling jet is normally at right angles to the imain jet and moves in a plane .containing both jetsQ A relay in accordance with the invention may have associated with it any known or convenient,’ form of anti-hunting device. Thus the activity of the servo device initiated by movement of'theT when the nozzle is de?ected considerably in the direction of the arrow, the main jet I0 will be - slicéd,- Soto speak, to a varying amount by the vane I2. Figure 4 shows another arrangement employ either to tend to restore the position otthis noz~ zle towards its previous position or, to move the Q ‘ mg; anojzzie' ‘4*’ similar to that of an acetylene gas remainder of the apparatus carrying" the main , Burner and which produces two jets I3 and I4 nozzle and receiving ori?ce to :follow', up" the _ which are’ at- an angle, for example, of 90° with controlling nozzle about its axis may be made ' movement of the controlling nozzle. , l ,_ 15 The invention will now be"v described with ref: erence to the accompanying drawing, whichis‘ respect to one another, these jets impinging upon one another to produce a fan-tail flow which is presented‘edgewise to the main jet I0. We claim: somewhat diagrammatic and in which: ' Figure 1 is a perspective View of a ?uid jet re laywin accordance with the invention. 1. A mechanical relay of the fluid jet type, 20 comprising a pair of ?uid jet nozzles arranged in Figure 2 is a similar View of the three jets substantiallyaxi‘al' alignment and facing‘ one‘ an showing the formation thereof. Figure 3 is a diagrammatic view snewinethe otherwhereby pressure ?uid Supplied to one; 1102 zle" pmd‘ucesv a ?uid jet therefrom which ‘nor ?ce, these members I and 2 being mounted ‘on a of nozzles as to cause its’ jet to'ivariably impinge upon the‘ ?rst-mentioned ,jet in accordance‘ with the movements imparted; to said third nozzle and to‘ thereby vary the “amount or fluid entering said mally tends to enter the ori?ce of the other'noz controlling nozzle in elevationrand provided with 25 zle, and a thirdnoz‘zle arranged with its axis a vane orba?ie for controlling the main jet. substantially at right angles to and in proximity Figure 4 is a diagrammatic view of a two-jet to said jet whereby pressure ?uid suppliedto said nozzle for controlling the main jet. I third'noiz‘zl'e produces a fluid jet which‘impinges In the drawing l_ is theinozzle to which the upon the ?rst-mentioned jet; said‘ third‘ nozzle ?uid is continuously supplied under constant being soinovably mounted relativély'lto said pair pressure, whilst 2 is the receiving nozzle or. ori base, member or, carrier 3. At 4 is shown the third nozzle which in the example illustrated pro vides a jet at’ right angles to the ?uid jet pass ing between the nozzle "I andiori?ce 2. The noz 35 ori?ce of said other nozzle". bracket 6 and rotatable with respect thereto about an axis coaxial ‘with the pipe ‘I through which the pressure?uid is supplied to the nozzle 4. ,The member'5 is rocked aboutits axis of ro tationby means of V an, arm ’ ' 2. _A,re1ay as‘ claimed in claim 1, wherein said third nozzle is movable about-arr axis'which is so zle 4 is mounted. on ‘a member SJcarried in a dispose‘dwith' respect to'the directiori'of e?lux of the jet from one‘ of said pair of'ii'ozz‘les that the 40 latter jet produces no torque on said third noz and link 9, the zle about its axis of ‘movement. I ' ' 3. A relay as claimed in claim 1‘, wherein said latter being connected to the measuring instru third nozzlev is formed to‘ produe'eta fanet'ail jet. ment or other controlling member. 4. A relay as claimed in' claim 1;‘including’ a The nozzle I and receiving ori?ce 2 may have ‘vane associated with said thirdiiozzle and mov 45 interior forms such as illustrated in Fig. 2 whilst able into‘the' ?eldi‘of the jet from one of said pair the nozzle 4 may have,‘ an elongated ‘mouth 4;; to of nozzles‘ upTon large de?ections‘ of‘ said third give a fan-tailrtype of jet; Figure 3 shows such nozzle. ‘ a nozzle provided with ‘a vane or ba?le'fo'r con trolling the main.jet._ ‘In. unsl?gere, the small ROBERT OECI’QERAITHWAITE; circle I 0 represents the jet normally passing from 50 KENNETH WILCOX. - ~ '