公开(公告)号：WO1988000335A1

公开(公告)日：1988-01-14

申请号：PCT/US1987001374

申请日：1987-06-12

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  KNECHT, Thomas, A. ,  FRICK, Roger, L. ,  BRUESEHOFF, Steven, M.

IPC: G01L07/08

CPC classification number: G01L19/147 ,  G01L9/0073 ,  G01L13/025 ,  G01L19/003 ,  G01L19/0038 ,  G01L19/0061 ,  G01L19/0645 ,  G01L19/148

Abstract: A cell for sensing differential pressures has a single brittle material diaphragm (63, 93, 102) mounted on support plates (50, 75, 120, 130) positioned on opposite sides of the diaphragm (63, 93, 102). The diaphragm surfaces (43C, 77C, 102A, 102C) when at zero differential pressure facing the support plate (50, 75, 120, 130) are concave and shaped to conform very closely to the shape the diaphragm (63, 93, 102) has when it is deflected so that when the diaphragm (63, 93, 102) is under a selected pressure and it is forced against one of the support plates (50, 75, 120, 130) in either direction, the diaphragm (63, 93, 102) is substantially planar or flat and supported fully on its support plate (50, 75, 120, 130). The diaphragm (63, 93, 102) may be shaped by placing it under a pressure so that it bows or deflects and then grinding the surface (43C, 77C) opposite from the applied pressure flat. When the pressure is removed, the diaphragm (63, 93, 102) relaxes and the exact required shape is produced on the surface (43C, 77C, 102A) that had been bowed out and ground flat. The same procedure can be done to the other side (102C) of the diaphragm (102) or two diaphragm sections (43, 43; 77, 77) may be fixed together.

公开(公告)号：EP0312532B1

公开(公告)日：1995-09-27

申请号：EP87904185.3

申请日：1987-06-12

Applicant: ROSEMOUNT INC.

Inventor： KNECHT, Thomas, A. ,  FRICK, Roger, L. ,  BRUESEHOFF, Steven, M.

IPC: G01L7/08 ,  G01L9/04 ,  G01L9/12

CPC classification number: G01L19/147 ,  G01L9/0073 ,  G01L13/025 ,  G01L19/003 ,  G01L19/0038 ,  G01L19/0061 ,  G01L19/0645 ,  G01L19/148

Abstract: A cell for sensing differential pressures has a single brittle material diaphragm (63, 93, 102) mounted on support plates (50, 75, 120, 130) positioned on opposite sides of the diaphragm (63, 93, 102). The diaphragm surfaces (43C, 77C, 102A, 102C) when at zero differential pressure facing the support plate (50, 75, 120, 130) are concave and shaped to conform very closely to the shape the diaphragm (63, 93, 102) has when it is deflected so that when the diaphragm (63, 93, 102) is under a selected pressure and it is forced against one of the support plates (50, 75, 120, 130) in either direction, the diaphragm (63, 93, 102) is substantially planar or flat and supported fully on its support plate (50, 75, 120, 130). The diaphragm (63, 93, 102) may be shaped by placing it under a pressure so that it bows or deflects and then grinding the surface (43C, 77C) opposite from the applied pressure flat. When the pressure is removed, the diaphragm (63, 93, 102) relaxes and the exact required shape is produced on the surface (43C, 77C, 102A) that had been bowed out and ground flat. The same procedure can be done to the other side (102C) of the diaphragm (102) or two diaphragm sections (43, 43; 77, 77) may be fixed together.

公开(公告)号：EP0312532A1

公开(公告)日：1989-04-26

申请号：EP87904185.0

申请日：1987-06-12

Applicant: ROSEMOUNT INC.

Inventor： KNECHT, Thomas, A. ,  FRICK, Roger, L. ,  BRUESEHOFF, Steven, M.

IPC: G01L9 ,  G01L13

CPC classification number: G01L19/147 ,  G01L9/0073 ,  G01L13/025 ,  G01L19/003 ,  G01L19/0038 ,  G01L19/0061 ,  G01L19/0645 ,  G01L19/148

Abstract: Une cellule de détection de pressions différentielles comprend un seul diaphragme (63, 93, 102) en un matériau friable monté sur des plaques de support (50, 75, 120, 130) placées de côtés opposés du diaphragme (63, 93, 102). Lorsque la pression différentielle en face de la plaque de support (50, 75, 120, 130) est nulle, les surfaces (43C, 77C, 102A, 102C) du diaphragme sont concaves et façonnées de façon à avoir une forme très similaire à celle du diaphragme (63, 93, 102) lorsque celui-ci est fléchi, de sorte que lorsque le diaphragme (63, 93, 102) est soumis à une pression sélectionnée et comprimé contre une des plaques de support (50, 75, 120, 130) dans l'un ou l'autre sens, il (63, 93, 102) a une forme sensiblement plane ou plate et s'appuie complètement sur sa plaque de support (50, 75, 120, 130). Le diaphragme (63, 93, 102) peut être façonné en courbant ou fléchissant sous une pression, puis en aplanissant par meulage la surface (43C, 77C) soumise à la pression. Lorsque l'on enlève la pression, le diaphragme (63, 93, 102) se détend et la surface (43C, 77C, 102A) fléchie et aplanie par meulage acquiert l'exacte forme requise. On peut appliquer le même procédé à l'autre côté (102C) du diaphragme (102) ou on peut joindre deux sections de diaphragme (43, 43; 77, 77).