Diaphragm and pulsation damper using same

Patent metadata

Field	Value
Publication number	US-10480466-B2
Application number	US-201515533209-A
Country	US
Kind code	B2
Filing date	Nov 24, 2015
Priority date	Dec 12, 2014
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A diaphragm includes a flange and a protrusion provided to protrude to one side of the flange, wherein the protrusion has at least two annular curved portions provided annularly on a ceiling portion having a flat surface-like shape and an outer side in a radial direction of the ceiling portion, in a state where pressure on an outer wall side of the protrusion and pressure on an inner wall side of the protrusion are the same, the at least two annular curved portions are each formed to be curved in a cross-section of the diaphragm obtained by cutting the diaphragm by a virtual plane including a center line of the diaphragm, the centers of curvature of the curved portions being arranged at different positions on a side opposite to a protruding direction of the protrusion, and the diaphragm is formed of a sheet metal.

First claim

The invention claimed is:

1. A diaphragm comprising a flange, and a protrusion provided to protrude to one side of the flange,
wherein the protrusion comprises at least two annular curved portions provided annularly on a ceiling portion having a flat surface-like shape and on an outer side in a radial direction of the ceiling portion, in a state where pressure on an outer wall side of the protrusion and pressure on an inner wall side of the protrusion are the same,
the at least two annular curved portions are each formed to be curved in a cross-section of the diaphragm obtained by cutting the diaphragm by a virtual plane including a center line of the diaphragm, and centers of curvature of the at least two annular curved portions are all arranged at different positions on a side opposite to a protruding direction of the protrusion,
the protrusion has a concave curved shape only on an inner wall surface among an outer wall surface and the inner wall surface of the protrusion over the entire area from the outermost one of the at least two annular curved portions to the center line of the diaphragm,
the diaphragm further comprises an annular rising portion provided between the flange and the protrusion, the annular rising portion curvilinearly rising from the flange to the protrusion and having a curvature radius in the cross-section of the diaphragm larger than that of the outermost one of the at least two annular curved portions, and
the diaphragm is formed of a sheet metal.

2. The diaphragm according to claim 1 ,
wherein the protrusion comprises a connecting portion configured to connect the at least two annular curved portions together, and
the connecting portion is formed to be in a linear state inclined with respect to the ceiling portion in a cross-section of the diaphragm obtained by cutting the diaphragm by a virtual line including a center line of the diaphragm in a state where the pressure on the outer wall side of the protrusion and the pressure on the inner wall side of the protrusion are the same.

3. The diaphragm according to claim 2 ,
wherein the at least two annular curved portions each have a different radius of curvature in the cross-section of the diaphragm obtained by cutting the diaphragm by the virtual line including the center line of the diaphragm.

4. A diaphragm comprising a flange, and a protrusion provided to protrude to one side of the flange,
wherein the protrusion comprises a curved center portion and at least one annular curved portion provided annularly on an outer side in a radial direction of the curved center portion,
the curved center portion and the at least one annular curved portion are each formed to be curved in a cross-section of the diaphragm obtained by cutting the diaphragm by a virtual plane including a center line of the diaphragm in a state where a pressure on an outer wall side of the protrusion and a pressure on an inner wall side of the protrusion are the same, centers of curvature of the curved center portion and the at least one annular curved portion are all positioned on a side opposite to a protruding direction of the protrusion, and the center of curvature of the curved center portion is positioned on a center line of the diaphragm,
the protrusion has a concave curved shape only on an inner wall surface among an outer wall surface and the inner wall surface of the protrusion over the entire area from the outermost one of the at least one annular curved portion to the center line of the diaphragm,
the diaphragm further comprises an annular rising portion provided between the flange and the protrusion, the annular rising portion curvilinearly rising from the flange to the protrusion and having a curvature radius in the cross-section of the diaphragm larger than that of the outermost one of the at least one annular curved portion, and
the diaphragm is formed of a sheet metal.

5. A pulsation damper comprising two diaphragms, each diaphragm formed of a sheet metal and comprising a flange and a protrusion provided to protrude to one side of the flange, the two diaphragms joined by the flanges and forming an enclosed space,
wherein the protrusion comprises at least two annular curved portions provided annularly on a ceiling portion having a flat surface-like shape and on an outer side in a radial direction of the ceiling portion, in a state where pressure on an outer wall side of the protrusion and pressure on an inner wall side of the protrusion are the same,
the at least two annular curved portions are each formed to be curved in a cross-section of the diaphragm obtained by cutting the diaphragm by a virtual plane including a center line of the diaphragm, and centers of curvature of the at least two curved portions are all arranged at different positions on a side opposite to a protruding direction of the protrusion,
the protrusion has a concave curved shape only on an inner wall surface among an outer wall surface and the inner wall surface of the protrusion over the entire area from the outermost one of the at least two annular curved portions to the center line of the diaphragm, and
the diaphragm further comprises an annular rising portion provided between the flange and the protrusion, the annular rising portion curvilinearly rising from the flange to the protrusion and having a curvature radius in the cross-section of the diaphragm larger than that of the outermost one of the at least two annular curved portions.

6. The pulsation damper according to claim 5 ,
wherein the two diaphragms have mutually different shapes.

7. The pulsation damper according to claim 6 ,
wherein the enclosed space is filled with inert gas.

8. A pulsation damper comprising two diaphragms, each diaphragm formed of a sheet metal and comprising a flange and a protrusion provided to protrude to one side of the flange, the two diaphragms joined by the flanges and forming an enclosed space,
wherein the protrusion comprises a curved center portion and at least one annular curved portion provided annularly on an outer side in a radial direction of the curved center portion,
the curved center portion and the at least one annular curved portion are each formed to be curved in a cross-section of the diaphragm obtained by cutting the diaphragm by a virtual plane including a center line of the diaphragm in a state where a pressure on an outer wall side of the protrusion and a pressure on an inner wall side of the protrusion are the same, and centers of curvature of the curved portion and the at least one annular curved portion are all positioned on a side opposite to a protruding direction of the protrusion, and the center of curvature of the curved center portion is positioned on the center line of the diaphragm,
the protrusion has a concave curved shape only on an inner wall surface among an outer wall surface and the inner wall surface of the protrusion over the entire area from the outermost one of the at least one annular curved portion to the center line of the diaphragm, and
the diaphragm further comprises an annular rising portion provided between the flange and the protrusion, the annular rising portion curvilinearly rising from the flange to the protrusion and having a curvature radius in the cross-section of the diaphragm larger than that of the outermost one of the at least one annular curved portion.

9. The pulsation damper according to claim 8 ,
wherein the two diaphragms have mutually different shapes.

10. The pulsation damper according to claim 9 ,
wherein the enclosed space is filled with inert gas.

11. A pulsation damper comprising a diaphragm formed of a sheet metal and an other member that differs from the diaphragm, the diaphragm compris

Assignees

• Fujikoki Corp
• Denso Corp

Inventors

• Tomitsuka Masahiro
• Yoshida Shin
• Sudo Makoto
• Nanbu Akinori
• Hishinuma Osamu
• Yamada Hiroatsu

Classifications

• F02M59/36

  by variably-timed valves controlling fuel passages {to pumping elements or overflow passages} · CPC title

• F02M59/44

  Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; {Pumps having transducers, e.g. to measure displacement of pump rack or piston} · CPC title

• F02M37/0041 Primary

  Means for damping pressure pulsations (equalisation of pulses in positive displacement pumps F04B1/00; devices for damping fluid pulsations in pipes F16L55/04) · CPC title