Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
311 words
A differential pressure measuring transducer comprising: a. a substantially rigid housing having two opposed end faces, a first centrally disposed cavity in a first end face, a second centrally disposed cavity in a second end face, and a passage connecting the two cavities; b. a first pressure responsive diaphragm disposed adjacent the first end face and sealed thereto along its periphery; c. a second pressure responsive diaphragm disposed adjacent the second end face and sealed thereto along its periphery; d. a rod extending through the passage and engaging at each end a respective diaphragm; e. a first armature plate attached to the rod adjacent the first diaphragm; f. a second armature plate attached to the rod adjacent the second diaphragm; g. a first core positioned in the first cavity contiguous with the housing and spaced from the first armature and having a centrally disposed opening therein in alignment with the passage, through which the rod may slide; h. a second core positioned in the second cavity, contiguous with the housing and spaced from the second armature and having a centrally disposed opening therein is alignment with the passage, through which the rod may slide; i. a first primary and secondary inductive coil assembly mounted in the first core; j. a second primary and secondary inductive coil assembly mounted in the second core so that each armature and core assembly constitutes a transformer; and k. means for connecting the coil assemblies into a variable inductance measuring circuit including primary energizing means so that when the rod moves in response to differing pressures being sensed by the two diaphragms, one armature moves toward one core and the other armature moves away from the other core, whereby differing output voltages are induced in each secondary coil, the difference between the two voltages being a measure of the pressure differential being sensed by the diaphragms.
Claim 2
Dependent Claim
311 words
A differential pressure measuring transducer comprising: a. a substantially rigid housing having two opposed end faces, a first centrally disposed cavity in a first end face, a second centrally disposed cavity in a second end face, and a passage connecting the two cavities; b. a first pressure responsive diaphragm disposed adjacent the first end face and sealed thereto along its periphery; c. a second pressure responsive diaphragm disposed adjacent the second end face and sealed thereto along its periphery; d. a rod extending through the passage and engaging at each end a respective diaphragm; e. a first armature plate attached to the rod adjacent the first diaphragm; f. a second armature plate attached to the rod adjacent the second diaphragm; g. a first core positioned in the first cavity contiguous with the housing and spaced from the first armature and having a centrally disposed opening therein in alignment with the passage, through which the rod may slide; h. a second core positioned in the second cavity, contiguous with the housing and spaced from the second armature and having a centrally disposed opening therein is alignment with the passage, through which the rod may slide; i. a first primary and secondary inductive coil assembly mounted in the first core; j. a second primary and secondary inductive coil assembly mounted in the second core so that each armature and core assembly constitutes a transformer; and k. means for connecting the coil assemblies into a variable inductance measuring circuit including primary energizing means so that when the rod moves in response to differing pressures being sensed by the two diaphragms, one armature moves toward one core and the other armature moves away from the other core, whereby differing output voltages are induced in each secondary coil, the difference between the two voltages being a measure of the pressure differential being sensed by the diaphragms.
Claim 3
Dependent Claim
41 words
The transducer of claim 1 wherein the housing has a fill passage therein for filling the space between the diaphragms and their respective end faces, the cavities, the passage, the openings, and any other hollow spaces within the housing with fluid.
Claim 4
Dependent Claim
12 words
The transducer of claim 2 including means for sealing the fill passage.
Claim 5
Dependent Claim
28 words
The transducer of claim 1 including a buffer disc between each armature and its respective core So that a cushion is provided between these parts under overrange conditions.
Claim 6
Dependent Claim
34 words
The transducer of claim 1 wherein one end of the rod engages one diaphragm by means of a cap attached to a spring which resiliently bears against the corresponding end face of the housing.
Claim 7
Dependent Claim
37 words
The transducer of claim 5 wherein a sleeve is peripherally disposed in the cavity around the other end of the rod to match the magnetic leakage of the spring, whereby quadrature in the output voltages is minimized.
Claim 8
Dependent Claim
51 words
The transducer of claim 6 wherein the other end of the rod engages the other diaphragm by means of a second cap and including a shoulder on each cap and a seat disposed on each end face for a shoulder to seat against under overrange conditions, whereby overrange protection is provided.
Claim 9
Dependent Claim
36 words
The transducer of claim 1 wherein each diaphragm and its respective end face have matching contours and the diaphragm is designed to seat against the end face at a given pressure, whereby overrange protection is provided.
Claim 10
Dependent Claim
34 words
The transducer of claim 1 including means for adjusting the length of the rod between the armatures so as to adjust the spacing between an armature and its respective core at zero differential pressure.
Claim 11
Dependent Claim
32 words
The transducer of claim 1 wherein the two secondary coils are connected bucking in the measuring circuit whereby the output voltage is the difference between the voltages induced in each secondary coil.
Claim 12
Dependent Claim
19 words
The transducer of claim 1 wherein cross-passages are provided between the coil assemblies so that electrical connection is facilitated.
Claim 13
Dependent Claim
23 words
The transducer of claim 1 wherein the primary coil and secondary coil of each assembly are positioned side-by-side, whereby high impedance is provided.