Optimized stress and strain distribution diaphragms
OwnerKjell E. Myhreinventor
Life of this patent
Estimating the term…
Abstract
A stress distribution plate, such as a diaphragm for a pressure transducer, has a central plane and a neutral stress plane. According to the invention, the neutral stress plane is displaced from the central plane, providing for a mechanical advantage or amplification in the operation of the stress plate or transducer. The stress plate or diaphragm may be provided with a lacunose surface region or with a predetermined and preferably symmetrical pattern of mesas and recesses for a displacement of the neutral stress plane relative to the central plane.
Claims52
An improved transducer diaphragm for mounting around its periphery to a cylindrical spacer, said diaphragm comprising a plate having an even back surface and a multilevel front surface, which multilevel front surface includes an upper level spaced from said back surface, a lower level closer to said back surface than said upper level, and at least two symmetrically positioned recess portions at said lower level overlying a maximum strain amplitude section of the plate, and a strain gauge mounted on said lower level of the multilevel front surface in each of said recesses.
An improved transducer diaphragm comprising:
- an outer peripheral portion having a thickness greater than and separated by a boundary from its central sensory portion, said boundary defining at least one offset of said central portion extending into and partially bounded by said peripheral portion for receiving a strain gauge which can be mountable solely on said central sensory portion having a thickness smaller than said peripheral portion and substantially overlying the location of maximum compression amplitude of the diaphragm.
A stress distribution plate for a pressure transducer having a central plane and a neutral stress plane, the neutral stress plane being displaced from the central plane, a first surface and a second surface, a predetermined pattern of mesas and recesses on the first surface and apertures penetrating the plate through the entire thickness of said plate including said first and second surfaces adjacent said mesas and recesses, and means for actuating the plate.
In a stress distribution plate, the improvement comprising in combination:
- an edge region and a raised portion spaced from said edge region and integral with said plate;
- a first peninsula extending from said edge region to said spaced portion and being connected to said edge region by a first isthmus;
- a second peninsula extending from said spaced portion to said edge region and being connected to said spaced portion by a second isthmus;
- mutually spaced apertures penetrating said plate through its entire thickness adjacent said peninsulas and isthmi;
- a third isthmus interconnecting said first peninsula with said spaced portion;
- a fourth isthmus interconnecting said second peninsula with said edge region;
- first and second strain gauges bonded to said diaphragm along said first and second isthmi, respectively;
- and
- means for actuating said spaced portion.
A stress distribution plate for a pressure transducer having a central plane and a neutral stress plane, the neutral stress plane being displaced from the central plane, and said plate having a tetraplanar configuration, with a portion of said plate between a first plane and a second plane of said tetraplanar configuration sloping at like angles to said first and second planes.
In a pressure transducer having a housing and a strain gauge plate mounted therein, the strain gauge plate having a first surface for the mounting of at least one strain gauge thereon, and a second surface, and also having a stress plane and a neutral pressure plane, the improvement comprising:
- means including said strain gauge plate having a plurality of recesses in said first surfaces for displacing the neutral stress plane from the central plane and apertures penetrating said plate through the entire thickness of the plate including said first and second surfaces;
- strain gauge means mounted on said first surface between said recesses;
- and
- means connected to said plate for picking up pressure and transferring a picked-up pressure force to a central portion of said plate.
In a transducer diaphragm, the improvement comprising in combination:
- a recess in said diaphragm encompassed by a circumferential edge region of said diaphragm;
- a promontory projecting from said edge region into said recess and being integral with said diaphragm;
- and
- a strain gauge bonded to said diaphragm in coincidence with said promontory.
In a transducer diaphragm, the improvement comprising in combination:
- a recess in said diaphragm encompassed by a circumferential edge region of said diaphragm;
- a first promontory projecting from said edge region into said recess and being integral with said diaphragm;
- a second promontory separate from said first promontory and projecting from said edge region into said recess diametrically opposite from said first promontory and being integral with said diaphragm;
- a first strain gauge bonded to said diaphragm in coincidence with said first promontory;
- and
- a second strain gauge bonded to said diaphragm in coincidence with said second promontory.
In a transducer diaphragm, the improvement comprising in combination:
- a central portion on said diaphragm having first radial projections, and a circumferential edge region of said diaphragm having second radial projections and encompassing said central portion and first radial projections, a recess in said diaphragm separating said central portion and first radial projections from said edge region and second radial projections;
- and
- strain gauges bonded to said diaphragm in coincidence with said projections.
In a transducer diaphragm, the improvement comprising in combination:
- a circumferential edge region and a raised central portion spaced inwardly from said circumferential edge region and integral with said diaphragm;
- diametrically opposed first and second isthmi interconnecting said edge region with said inwardly spaced central portion and being bounded by first and second recesses in said diaphragm extending between said edge region and said central portion;
- diametrically opposed and mutually spaced third and fourth isthmi in said central portion distinct from said first and second isthmi and being bounded by a third recess extending in and through a center of said raised central portion between said third and fourth isthmi;
- and
- first, second, third and fourth strain gauges bonded to said diaphragm in coincidence with said first, second, third and fourth isthmi, respectively.
In a transducer diaphragm, the improvement comprising in combination:
- a circumferential edge region and a raised central portion spaced inwardly from said circumferential edge region and integral with said diaphragm;
- diametrically opposed first and second isthmi interconnecting said edge region with said inwardly spaced central portion and being bounded by first and second recesses extending in said diaphragm between said edge region and said central portion;
- diametrically opposed and mutually spaced third and fourth isthmi in said central portion distinct from said first and second isthmi and being bounded by third and fourth recesses extending in said raised central portion inside of said first and second recesses;
- and
- first, second, third and fourth strain gauges bonded to said diaphragm in coincidence with said first, second, third and fourth isthmi, respectively.
In a transducer diaphragm, the improvement comprising in combination:
- a circumferential edge region and a raised central portion spaced inwardly from said circumferential edge region and integral with said diaphragm;
- a first peninsula extending from said edge region towards, but being spaced from, said central portion and being connected to said edge region by a first isthmus;
- a second peninsula extending from said edge region towards, but being spaced from, said central portion opposite said first peninsula, and being connected to said edge region by a second isthmus;
- a third peninsula extending from said central portion towards, but being spaced from, said edge region and being connected to said central portion by a third isthmus;
- a fourth peninsula extending from said central portion towards, but being spaced from, said edge region opposite said third peninsula, and being connected to said central portion by a fourth isthmus;
- and
- first, second, third and fourth strain gauges bonded to said diaphragm along said first, second, third and fourth isthmi, respectively.
In a transducer diaphragm, the improvement comprising in combination:
- distinct first, second, third and fourth isthmi in said diaphragm, each having a longitudinal dimension;
- said first, second, third and fourth isthmi extending along their longitudinal dimensions in series between opposite marginal diaphragm regions;
- and
- first, second, third and fourth strain gauges bonded, respectively, to said first, second, third and fourth isthmi.
In a transducer diaphragm, the improvement comprising in combination:
- a first pair of isthmi in said diaphragm having longitudinal dimensions;
- a second pair of isthmi in said diaphragm having longitudinal dimensions;
- said first and second pairs of isthmi extending with their longitudinal dimensions in series between opposite marginal diaphragm regions;
- and
- first, second, third and fourth strain gauges bonded, respectively, to said first, second, third and fourth isthmi.
In a transducer diaphragm, the improvement comprising in combination:
- a plurality of distinct recesses in said diaphragm providing distinct first, second, third and fourth isthmi between adjacent pairs of said recesses;
- further recesses in said diaphragm in addition to said recesses providing said first, second, third and fourth isthmi;
- and
- distinct first, second, third and fourth strain gauges bonded, respectively, to said first, second, third and fourth isthmi.
In a transducer diaphragm, the improvement comprising in combination:
- a plurality of distinct recesses in said diaphragm providing distinct first, second, third and fourth isthmi between adjacent pairs of said recesses, one of said distinct recesses being a central recess in a central region of said diaphragm and the other of said distinct recesses being situated around said central recess in a planetary manner between said central recess and a circumferential edge region of said diaphragm;
- and
- distinct first, second, third and fourth strain gauges bonded, respectively, to said first, second, third and fourth isthmi.
In a transducer diaphragm, the improvement comprising in combination:
- a lacunose surface region on said diaphragm;
- recesses in said surface region interconnecting lacunae of said lacunose surface region;
- and
- strain gauges bonded to said diaphragm in coincidence with regions located between lacunae of said lacunose surface region.
Dependencies are inferred from the claim text.