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Патент USA US2405199

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Aug. 6, 1946.
FLUID
w. s. PRESSURE
FAUEBT GAUGE
AL .
Filed April 19, 1944;
[7 .1 .
Patented Aug. 6, 1946 .
2,405,199
UNITED STATES PATENT OFFICE
2,405,199
FLUID PRESSURE GAUGE
William S. Faust and Harry J. Lavo, Williams
port, Pa., assignors to The Aviation Corpora
tion, New York, N. Y., a corporation of Dela
ware
Application April 19, 1944, Serial No. 531,689
14 Claims.
1
The invention relates to ?uid pressure gauges
and more particularly to that type which is
adapted for measuring either pressure ?uctua
tions or static pressures, or both.
(Cl. 201-48)
2
ing proportionate force to the diaphragm. v Disk
I8 is substantially rigid and for that purpose is
formed of suitable metal, such as steel. The ring
I9 is formed of thin or ?exible material, such as
One object of the invention is to provide an
brass shim stock, and its inner margin overlaps
improved pressure gauge which includes means
the outer margin of the disk 18 and is silver
responsive to ?uid pressures, an electrical strain
soldered to said ring. The ?exible ring permits
sensitive resistance wire, and means for strain
the disk I8 to be moved axially of the chamber
ing the wire responsively to the ?uid pressures
by and proportionately to the pressure of the
for controlling the actuation of a suitable indi l0 ?uid in the chamber [6. The disk I8 functions
cating or recording instrument.
as a rigid element which is responsive to pres
Another object of the invention is to provide
sure in the chamber I6 for straining a sensitive
a ?uid pressure indicator of this type which is
column 22. The chamber I1 is open to atmos
simple in construction and sensitive and ef?cient
phere through holes 2| which extend through the
in operation.
15 casing-section II.
Other objects of the invention will appear
The inner end of column 22 has a shoulder 29,
from the detailed description.
the face of which is silver-soldered to the disk
The invention consists in the several novel
I 8. The opposite end of column 22 has a shoulder
features hereinafter set forth and more particu
30, the face of which is similarly soldered to a
larly de?ned by claims at the conclusion hereof. 20 plate 21 which ?ts in a recess 28 in the inner
In the drawing:
face of casing-section II, and is ?xedly secured
Fig. 1 is a longitudinal section of a gauge em
bodying the invention.
Fig. 2 is a section taken on line 2—2 of Fig. 1.
Fig. 3 is a perspective of the piston which is
responsive to variations in ?uid pressure, and
the strain sensitive column which is strained by
the diaphragm and carries the electrical strain
sensitive elements.
Fig. 4 is a section taken on line 4-4 of Fig. 1.
Fig. 5 is a perspective of one of the strain
sensitive elements.
by screws 3| to said section and in said recess.
The axis of column 22 is perpendicular to the
plane of disk 18. The column is formed of suit
able material, such as heat treated beryllium
copper, and is strained by the pressure of the
?uid in the sealed chamber I5 which is applied
to the disk I 8 for axially loading the column.
The column, between shoulders 29 and 35, is
30 I-shaped in cross-section and comprises a ?at
web 23 and oppositely extending longitudinal
?anges 24. These ?anges resist bending of the
column by the axial loads applied to the column
Fig. -»6 is a diagram of an electric circuit in
by the ‘disk 18. The plate 2'! and its abutting
cluding a recording instrument controlled by
35 engagement with the casing-section II in recess
the strain sensitive elements.
28, rigidly restrain the end of the column oppo~
The invention is exempli?ed in a casing which
site the disk, so that the column will be strained
comprises a head or end-section l0 and an oppo
by axial loads applied thereto by the disk I8.
site end-section or head II and an intermediate
This construction exempli?es a column between
housing section I2, which sections are secured
together by bolts l3 which extend through the 40 the casing-section II and the disk I8 to which
axial forces are transmitted for straining the
sections II and I 2, and are screw-threaded at
column proportionately to the pressure of ?uid
I4 into a ?ange I5 which is integral with the
in chamber I6 through the disk l8.
section ID. The space within the housing is
An electrical strain sensitive element is ce
divided into two chambers or compartments l5
and I‘! by a pressure responsive element which 45 mented to each face of the Web 23 symmetrically
about the longitudinal axis of the column for
is formed of a disk I8 and a ring I9. The margin
measuring the longitudinal strain imparted to
of the ring is clamped between the contiguous
ends of the housing-section l2 and the ?ange
the column and for cancelling out any bending
l5 of the section I0 to form a seal for the cham
strain in the column. Such strains are imparted
ber between the pressure responsive element and
by the ?uid pressure in the chamber it. Each
section I 0. A pipe 20 connected to receive ?uid,
> of these strain sensitive elements comprises a
the pressure of which is to be measured, is screw
strip of ?ne strain-sensitive resistance Wire 32
threaded into the section In and is adapted to
for example .0015” diameter, bent into a series
admit the ?uid into the chamber IS. ‘The cham
of longitudinally extending loops and cemented
ber I 6 retains the ?uid under pressure for apply 55 between cover sheets 33 and 34. One of the
2,405,199
3
cover sheets of each strain-sensitive resistance
element is cemented to each side of the web 23
of the column 22. Lead conductors 35 are sol
dered to the ends of the resistance wire 32. The
wires 32 of the strain gauges are connected in
4
the casing exposed to the pressure of the ?uid
in the chamber and axially loading the other end
of the column, for straining the column respon“
sively to instantaneous ?uid pressures in the
chamber; and electrical strain sensitive ?laments
series to cumulate their changes in resistance
and attain greater sensitivity. The resistance
of the strain sensitive elements is proportionate
to the straining of the column and the pressure
10
of the ?uid in chamber Hi.
having loops extending longitudinally of and
The strain sensitive elements are connected
to any suitable circuit for controlling the actua
tion of a suitable instrument for recording or
provided at one of its ends with a chamber and
means for admitting to said chamber ?uid, the
indicating the pressure of the fluid in the cham
sensitive column; a rigid abutment for one end
of said column having substantially ?at sides; a
pressure responsive element in the casing ex
posed to the pressure of fluid in the chamber and
axially loading the other end of the column, for
straining the column responsively to ?uctuations
ber l6 as controlled by the voltage drop across
the strain gauges. In Fig. 6, the resistance wires
?xed on the column for controlling an electrical
circuit responsively to the strains imparted to
the column.
2. A ?uid pressure gauge comprising a casing
pressure of which is to be measured; a strain
32 of the strain gauges are incorporated in an
electric circuit which includes a source of alter
nating current of any desired frequency and an
isolating transformer. The secondary leads of 20 of the ?uid pressure in the chamber; and a pair
of series-connected electric strain sensitive ?la
the transformer 39 are connected to an alter
ments ?xed on the sides of the column, for con
nating current bridge circuit, generally desig
trolling an electrical circuit responsively to the
nated 40, having resistance arms Mia, Mlb and 4D“
and having the resistance wires of the strain
pressure ?uctuations in the chamber.
3. A ?uid pressure gauge comprising a casing
gauges 32 forming the fourth bridge arm. The 25
provided at one of its ends with a chamber and
potential drop across the wire gauges varies in
means for admitting to said chamber ?uid, the
accordance with the changes of the resistance
therein, thereby causing a change in the poten
pressure of which is to be measured; a strain
sensitive column having a substantially ?at side
tial applied to an alternating current ampli?er
4| which is connected to a cathode ray or record 30 portion; the casing being provided with an ex
ing oscillograph 42 for recording or indicating
tension for enclosing, and a rigid abutment for
one end of, said column; a pressure responsive
the pressures of the ?uid in the chamber l6 as
element in the casing exposed to the pressure of
measured by the change in resistance of the wires
the ?uid in the chamber and axially loading the
32 cemented on the column 22.
The device described is adapted for measuring
other end of the column, for straining the column
static pressure and/or pressure variations in
responsively to ?uctuations of the ?uid pressure
lines containing ?uid, such for example as the
in the chamber; and an electric strain sensitive
pressure in the supercharger system of an air
?lament ?xed on the ?at side portion of the
column for controlling an electrical circuit re
craft engine, as well as ?uid in lines used for
40 sponsively to the pressure ?uctuations in the
other purposes.
In operation, pressure of the ?uid in the sealed
chamber.
4. A ?uid pressure gauge comprising a casing
chamber l6 reacts on the disk [8 and strains the
provided at one of its ends with a chamber and
column 22 proportionately to such pressures.
means for admitting to said chamber ?uid, the
The abutment plate 2‘! on the column is rigidly
pressure of which is to be measured; a strain
held longitudinally by its abutment with rigid
sensitive column; the casing being provided with
head I l of the casing, so that the axial pressure
an enclosing member around the column and
applied to the disk [6 strains the column 22 pro
at its opposite end with a rigid abutment for one
portionately to the instantaneous pressure of the
end of said column; a pressure responsive ele
?uid in the line to which the pressure gauge is
ment in the casing exposed to the pressure of
applied,
?uid in the chamber, and axially loading the other
The invention exempli?es a pressure gauge
end of the column for straining the column re
which includes a strain-sensitive column which is
sponsively to ?uctuations of the ?uid pressure
strained responsively to pressure of the ?uid‘ and
in the chamber; and an electric strain sensitive
carries one or more electric strain sensitive re
?lament ?xed on the column and including longi
sistance elements for controlling the electric cir
tudinally extending loops for controlling an elec
cuit for the actuation of a recording or indicating
trical circuit responsively to the pressure ?uctua
instrument. This gauge is simple in construction,
and sensitive and ef?cient in its operation. The
tions in the chamber.
5. A ?uid pressure gauge comprising a casing
gauge can be readily applied to any line contain
ing a ?uid and is well adapted for measuring 60 provided at one of its ends with a chamber and
means for admitting to said chamber ?uid, the
static and/or dynamic ?uid pressures.
pressure of which is to be measured; a strain
The invention is not to be understood as re
sensitive column provided with an axially ex
stricted to the details set forth, since these may
tending web and longitudinal ?anges for restrain
be modi?ed within the scope of the appended
ing bending; a rigid abutment for one end of
claims‘ without departing from the spirit and
said column; a pressure responsive element in
scope of the invention.
the casing exposed to the pressure of the ?uid
Having thus described the invention, what we
in the chamber and axially loading the other end
claim as new and desire to secure by Letters
of the column, for straining the column respon
Patent is:
sively to instantaneous ?uid pressures in the
1. A ?uid pressure gauge comprising a casing
chamber; and an electric strain sensitive ?lament
provided at one of its ends with a chamber and
?xed on the column for controlling an electrical
means for admitting to said chamber ?uid, the
circuit responsively to the strains imparted to
pressure of which is to be measured; a strain
the column.
I
sensitive column; a rigid abutment for one end
of said column; a pressure responsive element in P
6. A. fluid pressure gauge comprising a casing
5
2,405,199
provided at one of its ends with a chamber and
means for admitting to said chamber ?uid, the
pressure of which is to be measured; a strain
sensitive column provided with an axially ex
tending web, shoulders at its ends, and longi
tudinal ?anges projecting from both sides of the
web, for restraining bending, a rigid abutment
for one end of said column; a pressure responsive
to form one side of and exposed to pressure of
the ?uid in said chamber; the casing being pro
vided with a recess forming a rigid abutment; a
strain-sensitive column having a plate ?tting in
said recess and restrained by said abutment, and
having its other end secured to, and axially loaded
by, the disk, for straining the column respon
sively to pressure ?uctuations in the chamber;
element in the casing exposed to the pressure of
the ?uid in the chamber and axially loading the
other end of the column, for straining the column
responsively to ?uctuations of the ?uid pressure
and an electric strain sensitive ?lament ?xed on
the column for controlling an electric circuit re
in the chamber; and an electric strain sensitive
?lament on the vcolumn for controlling an elec
11. A ?uid pressure gauge comprising a casing
sponsively to the pressure ?uctuations in the
chamber.
trical circuit responsively to the pressure ?uctua 15 which includes an end-section provided with ‘a
chamber and means for admitting to the chamber
tions in the chamber.
?uid,
the pressure of which is to be measured,
7. A ?uid pressure gauge comprising a casing
on opposite end-section provided with a rigid
provided at one of its ends with a chamber, and
abutment, and an intermediate housing section;
means for admitting to the chamber ?uid, the
pressure of which is to be measured; a pressure 20 a pressure responsive element forming one side
of the chamber and including a rigid central disk
responsive element comprising a rigid central
disk and a ?exible marginal member, joined to
gether to form one side of, and exposed to pres
sure of the ?uid in, said chamber; a rigid abut
and a ?exible ring jointed to the disk and having
its margin clamped between the housing-section
and the casing-section provided with the cham
ment on the other end of the casing; a strain 25 ber; a strain-sensitive column extending across
and housed by the intermediate section, axially
sensitive column restrained at one of its ends by
loaded at one end by the disk, and engaging the
said abutment, and axially loaded on its other
abutment at its other end, for straining the col
end by the disk, for straining the column re
umn responsively to the ?uctuations of the pres
sponsively to pressure ?uctuations in the cham
sure of the ?uid against the piston, and an elec
ber; and an electric strain sensitive ?lament ?xed 30
tric strain sensitive ?lament ?xed on the column,
on the column and including portions extending
for
controlling an electric circuit responsively to
substantially parallel of the access of the abut
the pressure ?uctuations in the chamber.
ment for controlling an electric circuit respon
12. A ?uid pressure gauge comprising a casing
sively to the pressure ?uctuations in the chamber.
which
includes an end section provided with a
8. A ?uid pressure gauge comprising a casing
chamber
and means for admitting to the cham
provided at one of its ends with a chamber and
means for admitting to the chamber ?uid, the
pressure of which is to be measured; a pressure
ber ?uid, the pressure of which is to be measured,
an opposite end section provided with a rigid
abutment, and an intermediate housing-section;
responsive element comprising a rigid central
disk and a ?exible ring joined together to form 40 a pressure responsive element forming one side
of the chamber and including a rigid central disk
one side of and exposed to pressure of the ?uid
and
a ?exible ring joined to the disk and having
in said chamber; a rigid abutment on the casing
its margin clamped between the housing-section
and having substantially ?at sides; a strain-sen
and the casing-section provided with the cham
sitive column restrained at one of its ends by
ber;
a strain-sensitive column extending across
said abutment and at its other end axially loaded 45
and in the housing-section, provided with a
by and joined to the disk, for straining the column
shoulder at one end rigidly secured to, and axially
responsively to pressure ?uctuations in the cham~
loaded
by the disk, and an enlarged shoulder
ber; and an electric strain sensitive ?lament ?xed
at its other end restrained by the abutment in
on the column and having loops substantially
coplanar with the sides for controlling an electric 50 the end-section, for straining the column re
sponsively to the ?uctuations of the pressure of
circuit responsively to the pressure ?uctuations
the
?uid against the piston, and an electric strain
in the chamber.
sensitive ?lament ?xed on the column, for con
9. A ?uid pressure gauge comprising a casing
trolling the electric circuit responsively to the
provided at one of its ends with a chamber and
pressure ?uctuations in the chamber.
means for admitting to the chamber ?uid, the 55
13. A ?uid pressure gauge comprising a casing
pressure of which is to be measured; a pressure
which includes an end-section provided with a
responsive element comprising a rigid central
chamber and means for admitting to the cham
disk and a ?exible ring joined together to form
ber ?uid, the pressure of which is to be measured,
one side of and exposed to pressure of the ?uid
an opposite end-section provided with a rigid
in said chamber; a rigid abutment on the casing;
a strain-sensitive column having a plate on one
abutment, and an intermediate housing-section;
a pressure responsive element forming one side
of its ends engaging said abutment, having a sub
of the chamber and including a rigid central
stantially ?at side and having its other end se
disk
and a ?exible ring joined to the disk and
cured to and axially loaded by the disk, for strain
ing the column responsively to pressure ?uctua 65 having its margins clamped between the housing
section and the casing-section provided with the
tions in the chamber; and an electric strain sen
chamber; a strain-sensitive column extending
sitive ?lament ?xed on the ?at side of the column
across and in the housing-section, and provided
for controlling an electric circuit responsively to
with an enlarged shoulder at one end rigidly
the pressure ?uctuations in the chamber.
joined to and axially loaded by the disk, and a
10. A ?uid pressure gauge comprising a casing
shoulder at its other end having secured thereto
provided at one of its ends with a- chamber and
a plate for engaging the abutment in the end
means for admitting to the chamber ?uid, the
pressure of which is to be measured; a pressure
responsive element comprising a rigid central disk
and a flexible marginal member joined together
section, for straining the column responsively to
the ?uctuations of the pressure of the ?uid
against the piston, and an electric strain sensitive
?lament ?xed on the column, for controlling the
2,405,199
electric circuit responsively to the pressure ?uc
tuations in the chamber.
14. A ?uid pressure gauge comprising a casing
which includes an end section provided with a
chamber and means for admitting to the chamber
?uid, the pressure of which is to be measured,
an opposite end-section provided with a rigid
abutment, and an intermediate housing-section,
and housed by the intermediate section, and pro
vided with a web, a shoulder at one end rigidly
joined to and axially loaded by the disk, and a
shoulder at its other end having secured thereto
a plate for engaging the abutment in the end
section, for straining the column responsively to
the ?uctuations of the pressure of the ?uid
against the piston and provided with ?anges for
restraining torsional bending of the column; and
a pressure responsive element forming one side
an electric strain sensitive ?lament ?xed on the
of the chamber and including a rigid central disk 10 column for controlling the electric circuit respon
and a ?exible ring joined to the disk and having
sively to the pressure ?uctuations in the chamber.
its margins clamped between the housing-section
and the casing-section provided with the cham
ber; a strain-sensitive column extending across
WILLIAM S. FAUST.
HARRY J. LAVO.
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