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Патент USA US2407699

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Sept, 17, 1946.
2,407.;698
'F. W. GUIBERT E'I'AL
FLUID PRESSURE DEVICE 7
Filed May 8, 1944
,4
(I529 24 ’.
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INVENTORSI
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VI
Patented Sept.‘ 17, 1946
2,407,698
UNITED STATES, PATENT orrlcs
2,407,698
FLUID PRESSURE DEVICE
Francis W. Guibert, Beverly Hills, ‘and Frederic B.
Fuller, Whittier, Calif.; said Fuller assignor to
‘ said Guibert
Application‘May 8, 1944,‘Serial No. ‘534,578
5 Claims. I (Cl. 121-70)
1,
.
2 .
This invention relates to a device for metering
?uids, and ‘more particularly to a device of that
character provided with a pair of intermeshing
‘rotors.
.
;
.
ofv the plane 8 that passes through the axes 4
and 5.
Mounted for rotation about axes 4 and 5 are
the intermeshing rotors 9 and I0. Shafts H and
i
' The rotors of such .meters are actuated by fluid
I2 arerespectively integrally formed with the
pressure. As they rotate. the rotors pass uni
rotors 9 and I0, and are appropriately mounted
.form:volumes of the?uid from the inlet side to
for rotation by the aid of the end walls of the
the outlet‘ side of the meter. Accordingly,
casing l. Rotation of the rotors by the fluid
measurement. ofpthe ?uid passing through the
pressure exerted upon them in casing l is utilized‘
meter may be accomplished by ‘recording the 10 for indication of the volume of ?uid passing
integratedangular motion of the rotors. This
through the meter, as by the aid of a register
general type of ?uid measurement is well known.‘
connected to one of the shafts H or 12.
The volume of .fluid discharged per unit of
Each of the rotors 9 and 10 is provided with
angular movement is a ‘function of the form of
six substantially uniformly spaced teeth [3 to Hi
therotorsl It is one ,of .thevobjectsof this in
inclusive, and IE! to 24 inclusive. The teeth I3
vention to make it‘ possible ‘to increase the
to l8 inclusive on rotor 9 are arranged to inter
volume .per ‘unit of angular motion by providing
mesh with teeth [9 to 24 inclusive on rotor 10.
a novel con?guration for the rotors.‘ ‘.
These teeth have generally‘ the appearance of
It is :another object of_ this invention to. pro- .
vide. ?uid meter rotors that have interengaging 20
teeth of such ‘form that there is no appreciable
hazard of breaking or weakening of the teeth
through wear.
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gear teeth.
‘, 1
i
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Since both rotors 9 and H) are identical, only
one need be described in detail.
'
An envelope curve 25 is illustrated as envelop
ing the ends of “the teeth I3 to l8 inclusive on
It‘ is ‘still another object. of this invention to; - rotor 9. i This envelope curve, has somewhat the.
make it possible to .pass liquid through the meter, 25 form of an ellipse. A pitch line curve 26. for
although :the liquid may carry sand, or other
rotor 9 is. arranged to be tangential at all times
gritty matter,i_without ‘material injury to the
with the corresponding pitch line curve 21 of
‘rotor ID. The teeth intermesh in such manner
. ThisinVentionpossesses‘ many other advan-1 ‘ that the longer axis of symmetry of one rotor
tages, and ,hasother objectswhich may be made 30 comes into alignment with the shorter axis of
more clearly apparent from a consideration of
symmetry of theother rotor, as in Fig. ‘1. Pitch
one embodiment of the invention. For thispur
line curve 26 is, of course, located inside the en
pose there is shown a form in the drawing accom
velope curve 25, and it is spaced from the‘ curve
panying. and forming part of the present speci?- ,
25 by a uniform distance corresponding to the
cation. The form will now, be described in detail,
addendum of the teeth.
meter. 1
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illustrating the general principles of. the inven
tion; but it is to be understood that this detailed
description is not to’ be taken in a limiting sense,
sincedthe. scope Ofthis invention ,is best de?ned
‘by theappended claims.‘
-
y
Referring to the drawing: _
i
V
l
‘
i
t Figure ,1 is a diagrammatic, sectional view of
a meter, incorporating the invention;
, Figs. 2 and 3am views similar to Fig. '1'; on a ;
slightly reduced scale, illustrating the rotors of
the meter in successively, different positions; and
Fig. ,4 :is a fragmentary diagrammatic view of
aportion of a rotor.
In thepres'ent instance, the ‘?uid: meter is ar- ._
‘ .The rotor 9 has an axis of symmetry 28, and
‘ another axis of symmetry 28', which are mutually
perpendicular,v and which intersect at the center
of rotation 4'. The axis of symmetry 28 is longer
40 .than‘the axis'of'symmetry 28'; and preferably,
theratio of the lengths of the two axes is not
greater=__-than two. The longer axis 28 passes
ithrough the centersfof the end teeth l3 and IS.
‘The shorter axis 28f passes centrally between the
teeth [4, I5 and l1, l8.
The end‘teeth l3 and "5 are arranged to 00-‘
operate with cylindrical surfaces 2 for de?ning
--the;volume of measuring chambers, as herein-v
after described. ‘ Furthermore, the rotors will ro
ranged to pass a liquid medium, such‘ as water 50 ..tate as indicated by arrows 33 and 34 of Fig. 1,
or gasoline, through a meter casing. I. This
due to the exertion of fluid pressure on the sides
meter casing is provided withinternal cylindrical
of the teeth exposed in the. inlet side of the
surfaces 2 and. 3 that ‘have parallel spaced axes
casing l._
.
.
>4 and 5. Aninlet opening Sand an outlet‘open- ‘»
Due to the fact that the relatively few teeth
ing 1 are provided, respectivelinon opposite sides 55 permit the use'of large addenda, the amount of
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2,407,698
3 ,
as the teeth go in and out of mesh, the sand or
liquid or fluid passing through the casing I per
unit of annular motion of the rotors is quite
large; and, furthermore, the teeth are sturdy and
other foreign matter accumulating in the clear
ance spaces 36 is pressed out into the outlet 1.
The mode of operation of the meter is readily
understood from the foregoing. Fluid entering
the inlet 6 produces a preponderance of pressure,
can withstand the stresses that may be encoun
tered in operation.
In the position of Fig. l where the longer axis
of symmetry 28 of rotor 9 is in alignment with
such as to cause rotation of the rotors in the di
the shorter axis of symmetry of rotor It, liquid
or ?uid ?lls the space 29 between the ‘right-hand
rection of arrows 33 and 34. In this process of
which has just been sealed 'byithe entrysortoeth
and“ (Figs. 1 and 2) are much greater than if
rotation, the shafts I l :and 12 Jangularly'advance;
side of the rotor I0 and the cylindrical surface 3. 10 and this angular advance may be utilized to op
erate a recording or indicating mechanism in a
Upon further rotation, the ?uid in space 29
:well understood manner.
passed into the outlet 1, as illustrated in the su‘c-'
The ‘teeth being few and large, their addenda
ceeding position of Fig. 2.
are
large, and therefore the metering spaces 29
In Fig. 2 the metering space .30 is illustrated
smaller teethijwere-used. Furthermore, the teeth
I6 into operative relation‘with the cylindrical
are sturdy, and ‘it ‘is relatively easy to form the
surface 2. The ?uid in space 30 is about to be
. teeth {in .such' a way that they properly mesh one
discharged into the outlet 1 upon 'a-s'lightxfurther
witheanother to maintain the pitch line of the
rotors‘in continued tangential relation;
Such a discharge’ is, oc- .
rotation of the rotors.
curring in the succeeding position of Fig. ‘3, since
The inventors claim:
v'1. A ‘toothed rotor structure for Tal'?llid fpres'sure
tooth l3 has left surface 2.
'In ‘order that the teeth may mesh properly,>ia
further condition must be met.
device, having "the following characteristics: ‘(two
This is illus
"mutually perpendicular "axes .:of symmetry inter
center at axis 5 of rotor 'I'O be :drawn when ‘the 25 secting at the center of rotation; there beinglsix
trated in Figs.‘ 1 and 4.
If an are '38 ‘having its
substantially uniformly spacedateethe'on’ithezrotor;
rotors 9 and H) are ‘in the position illustrated ‘in
Fig. 1,‘ this are may be so chosen that it passes
there ‘being a :pitch line uniformly aspaced'ztrom‘
substantially through the center "of the teeth '15
and IT. The ‘radius of this are 38 is approxi
teeth as measured along the pitch line 'having
mately that of the cylindrical surface v'3.
the ends of ‘the ‘teeth; the spaces betweenthe
30 substantially the same ‘width as the teeth; vthe
*curve enveloping theends of ‘the teeth‘being'such
that one'faxis of symmetry measured'at-thezinter
sections with said ‘curve {is ilon'ger'ftlranjthe fother
axis of symmetry; ‘the ‘ratio of :the lengths 101i {the
‘Thus, as shown most clearly in ‘Fig.’ 1, the are
"38 bisects those portions of the 'radial'linesi3‘9, ‘4'0,
and 4| which extend from one side 'to'the ‘other
.of the tooth"! 5. This is true forall of ‘the radial
lines, such as 39, '40,;and 4], which dono‘t depart 35 axes having :a vvalue with an upper ‘limit of :sub
~~stantially two; the ‘ longer axis passing through
‘far from the line '26. The limiting positions of
the centers ’of two-of the teeth‘,‘=iand the shorter
these radial lines are substantially represented
axis ‘passing through the center ro‘fithe spaces
A complementary condition is' illustrated ‘in
'2. toothed rotor ‘structure-foria'?uidzpressure
Fig. 4.’ This condition may now be discussed.
bylines39and4l.
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between other-teeth.
Tooth l5 of rotor 9 is shown as havinga "line
3| corresponding approximately to the tangent
to the are 38} at the intersection 32 of ‘the arc
38 with the pitch lineZS. This tangent line 3'!
does'not pass through ‘that center of curvature
"
1
Y‘
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a
.d'eViCe,"‘haViIlg 2the following characteristics : 1 ‘:two
:mutually ‘perpendicular ‘axes of symmetry inter
sec‘ting :at (the center of rotation; there ‘being six
substantially uniformly spaced teeth :on ‘the se
45 torithe 'curveYenvelop-ing the ends of‘fthe teeth
being such that ‘one axis of symmetry measured
at the intersections‘ with said curve "is .ilon‘ger
than ‘the ‘other axis of symmetry, the ‘ratioV‘o'f
the lengths of the axes having a valuewithian
35 of pitch line '25 which corresponds to the pitch
‘line adjacent the point 32; nor does “it ‘pass
through the center of rotation 14. ‘Instead, it
‘assumes an intermediate ‘position somewhat
nearer to the center 4 than to {the center of 5,0 upper limit ‘of substantially-two; the‘longer axis
curvature 35.
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passing through ‘the c'en'ters'of two oithe teeth‘;
'
the ‘shorter axis passing through‘thevcenter of ‘the
spaces 'be'tweenother "teeth; 5the pitch line fOrLthe
These conditions ensure that ‘those ‘four'tee’t'h
l4, l5, l1 and IB which do not lie on the’longer
‘axis of symmetry 28 may-properly mesh with the
vteeth of the other rotor.
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teeth being substantially ‘uniformlyfspaced from
55 vthe-enveloping curve; the ‘said ‘four teethfforniing
twosets of two "teeth, each two ‘teeth in eac'h‘set
‘being on opposite sides of the shorter Iaxis’iof
symmetry, l‘the center ‘line of each set ‘having? a
portion'iadjacent the ‘pitch'l'ine ‘that 2is‘ curved
The depth of the teeth below the pitch lines-‘26
and 21 is greater than the‘h'eight o'f ‘fthe-rteeth
above the pitch lines. 'In other words, ‘there is
purposely a considerable ‘clearance ‘between. Ythe
teeth and; the corresponding meshing tooth,'de .60 about a'poin't on" the line de?ning rsaid'longer
axis, said point being located-at va“dist:a_tn"ce from
the axis of rotation'fcorre'spondin'g ito‘lhalf‘the
sum of the ‘length-‘of "the"1'on'ger and shorter axes
?ning a'narrow clearance space, ‘sucheas 3'64(Fig. "
'1) between ‘tooth l6 andthe 'spa‘ce’b'etweeniteeth
'23 and 24.‘ In this space may-collectlanyiforei'gn
‘matter, such as sand ‘or griit, that'maybe carried
into the meter housing; and, ‘therein, "suchrm'a
of the pitch line,'the point being 'on'thelsameside
of‘ the shorter "axis as the correspendingrzteeth
terial is innocuous, and cannot cause undue Ewear '
between'the contacting? rotor surfaces.
The end walls of the housing‘il are-veachlpro
‘vided with ‘a shallow ‘recess lor sump‘th‘a'ticom
'municates with such‘ spaces as 36 as the ‘teeth
a "go into meshing po'sitionfand that ‘is also :in com- "
‘munication with the outlet 1.’ The line 31 de?nes
the boundaries of the sump on onenf the ‘walls.
.The upper boundary does not extend above ‘the
plane '8'.passingthroughthe’ axes 4 andi5. Thus,
:inithe set.
'
a
.
F3; v=I-n’af’?uid pressure device, a casinghaving
lean of :internal -'cy1indrica1' surfaces with spaced
parallel axes, as well as an irilete'opening 'andian
outlet opening on opposite sides ~"o‘f vthe plane
70 ‘that
passes through the'said'axes; and->a.:pair
of rotorslhav'ing centers of rotation respectively
at "the ‘axes of ‘ the cylindrical surfaces; each lot
said rotors having'l-intermeshing teeth; and‘f-hav
754 vingthe following‘characteristics : ‘ there beingitwo
5
2,407,698
mutually perpendicular axes of symmetry inter
secting at the center of’ rotation of the rotor;
there being six substantially uniformly spaced
teeth on the rotor; there being a pitch line uni
formly spaced from the ends of the teeth; the
spaces between the teeth as measured along the
pitch line having substantially the same width as
the teeth; the curve enveloping the ends of the
teeth being such that one axis of symmetry
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6
on the line de?ning said longer axis, said point
being located at a distance from the axis of ro
tation corresponding to half the sum of the
length of the longer and shorter axes of the pitch
line, the point being on the same side of the
shorter axis as the corresponding teeth in the set.
5. In a ?uid pressure device, a casing having
a pair of internal cylindrical surfaces with spaced
parallel axes, as well as an inlet opening and an
measured at the intersections with said curve is 10 outlet opening on opposite sides of the plane that
longer than the other axis of symmetry, the ratio
passes through the said axes; and a pair of rotors
of the lengths of the axes of symmetry having a
having centers of rotation respectively at the
value with an upper limit of substantially two;
axes of the cylindrical surfaces; each of said ro
the longer axis of symmetry passing through the
centers of two of the teeth that move into seal
ing contact with one of said internal cylindrical
surfaces; and the shorter axis of symmetry pass
ing through the center of the spaces between
other teeth.
tors having intermeshing teeth, and having the
15 following characteristics: there being two mu
tually perpendicular axes of symmetry intersect
ing at the center of rotation of the rotor; there
being six substantially uniformly spaced teeth on
the rotor; the curve enveloping the ends of the
4. In a ?uid pressure device, a casing having a 20 teeth being such that one axis of symmetry meas
ured at the intersections with said curve is longer
parallel axes, as well as an inlet opening and an
than the other axis of symmetry, the ratio of the
outlet opening on opposite sides of the plane that
lengths of the axes of symmetry having a value
passes through the said axes; and a pair of rotors
with an upper limit of substantially two, the
pair ofrinternal cylindrical surfaces with spaced
having centers of rotation respectively at the
axes of the cylindrical surfaces; each of said
rotors having intermeshing teeth, and having the
following characteristics: there being two mu
tually perpendicular axes of symmetry intersect
ing at the center of rotation of the rotor; there
being six substantially uniformly spaced teeth on
longer axis of symmetry passing through the cen
ters of two of the teeth that move into sealing
contact with one of said internal cylindrical sur
faces; the shorter axis of symmetry passing
through the center of the spaces between other
teeth, the pitch line for the teeth being substan
tially uniformly spaced from the enveloping
the rotor; the curve enveloping the ends of the
curve; the four teeth that do not lie on the longer
teeth being such that one axis of symmetry meas
axis of symmetry being so formed that when the
ured at the intersections with said curve is longer
longer axis of symmetry of one rotor is in align
than the other axis of symmetry, the ratio of the 35 ment with the shorter axis of symmetry of the
lengths of the axes of symmetry having a value
other rotor, a circular arc can be drawn, with its
with an upper limit of substantially two; the
center on the axis of rotation of said other rotor,
longer axis of symmetry passing through the cen
with a radius approximating that of the internal
ters of two of the teeth that move into sealing
cylindrical surface of the casing, said are passing
contact with one of said internal cylindrical sur
through those two teeth on the one rotor which
faces; the shorter axis of symmetry passing
are adjacent and on opposite sides of the mesh
through the center of the spaces between other
' ing tooth on the long axis of symmetry of the said
teeth; the pitch line for the teeth being substan
tially uniformly spaced from the enveloping
curve; the said four teeth forming two sets of
two teeth, each two teeth in each set being on
opposite sides of the shorter axis of symmetry,
the center line of each set having a portion ad
jacent the pitch line that is curved about a point
'One rotor, said are substantially bisecting those
portions, de?ned by the sides of the said two
teeth, of lines extending radially from the said
center of the other rotor and intersecting said
teeth adjacent the pitch line.
FRANCIS W. GUIBERT.
FREDERIC B. FULLER.
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