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Патент USA US2408604

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Oct. 1, 1946.
- 2,408,603
Filed‘ Oct. 9, 19,45
Patented Oct. 1, 1946
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.
This invention relates to mechanical relays. of ' ‘
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
possibly also to eddy currents, the tendency of
the reaction imposed upon the controlling mem
‘ 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
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
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.
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
said jet whereby pressure ?uid suppliedto said
nozzle for controlling the main jet.
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
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.
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
associated with said thirdiiozzle and mov
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
a nozzle provided with ‘a vane or ba?le'fo'r con
trolling the main.jet._ ‘In. unsl?gere, the small
circle I 0 represents the jet normally passing from 50
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