US 4,407,330 AGranted

Pressure pulse absorbing device

AssigneeMitsubishi Jukogyo Kabushiki Kaisha

InventorHaruyoshi Fujiwara

Life of this patent

Estimating the term…

Abstract

A pressure pulse damping device which is used in a liquid passage having a bottom flat wall. The flat wall has an opening therethrough with a flexible diaphragm positioned therein. The side of the diaphragm opposite the liquid passage is in communication with a gas chamber having gas therein. The diaphragm is movable such that the effective volume of the gas chamber is varied to ensure that the average pressure of the gas therein is substantially equal to the average pressure of liquid in the liquid passage.

Claims7

Dependent claims

A pressure pulse damping device for use in a liquid passage, said damping device comprising:

a flexible diaphragm made of an easily deformable material having a small mass and adapted to cover an opening in a bottom wall of the liquid passage, the edge of said diaphragm being adapted to be fixed relative to the wall of the liquid passage;
a chamber beneath said diaphragm and to the interior of which the side of said diaphragm opposite the side facing the liquid passage faces, supporting means supporting said diaphragm between said chamber and said liquid passage for permitting at least a portion of said diaphragm to move out of and into said chamber perpendicular to the plane of the opening and in a radial direction of said liquid passage toward and away from the liquid passage, said supporting means being constituted by a support frame for said diaphragm, said support frame being attached to a portion of said diaphragm and positioned adjacent to the side of said diaphragm opposite the side facing the liquid passage, a support rod fixed to said support frame and extending radially outward from the liquid passage, and a porous plate defining a wall of said chamber for communicating said chamber with said diaphragm, said porous plate having a bore therethrough for radially slidably accommodating said support rod, whereby when the average pressure in the liquid passage is greater than that in said chamber said support rod moves away from the liquid passage and when the average pressure in the liquid passage is less than that in said chamber said support rod moves toward the liquid pressure;
gas contained in said chamber at a pressure equal to the average pressure of the liquid in the passage;
a gas supply means connected to said chamber for providing said chamber with gas whenever at least a portion of said diaphragm reaches a predetermined limit of radial movement away from the liquid passage;
a gas discharge means connected with said chamber for discharging gas from said chamber whenever at least a portion of said diaphragm reaches a predetermined limit of radial movement toward the liquid passage;
means for sealingly closing said chamber whenever said diaphragm moves toward and away from the liquid passage within the range between said limits of radial movement;
and
the total capacity of said chamber and said gas supply means being such that the change of shape of said diaphragm in response to a pulse of liquid in said passage causes a change in the pressure of said gas just sufficient to keep the pressure of the liquid in said liquid passage constant.

5 more elements

Dependencies are inferred from the claim text.

patentgrep

Loading patent…

Abstract

A pressure pulse damping device for use in a liquid passage, said damping device comprising:

a flexible diaphragm made of an easily deformable material having a small mass and adapted to cover an opening in a bottom wall of the liquid passage, the edge of said diaphragm being adapted to be fixed relative to the wall of the liquid passage;
a chamber beneath said diaphragm and to the interior of which the side of said diaphragm opposite the side facing the liquid passage faces, supporting means supporting said diaphragm between said chamber and said liquid passage for permitting at least a portion of said diaphragm to move out of and into said chamber perpendicular to the plane of the opening and in a radial direction of said liquid passage toward and away from the liquid passage, said supporting means being constituted by a support frame for said diaphragm, said support frame being attached to a portion of said diaphragm and positioned adjacent to the side of said diaphragm opposite the side facing the liquid passage, a support rod fixed to said support frame and extending radially outward from the liquid passage, and a porous plate defining a wall of said chamber for communicating said chamber with said diaphragm, said porous plate having a bore therethrough for radially slidably accommodating said support rod, whereby when the average pressure in the liquid passage is greater than that in said chamber said support rod moves away from the liquid passage and when the average pressure in the liquid passage is less than that in said chamber said support rod moves toward the liquid pressure;
gas contained in said chamber at a pressure equal to the average pressure of the liquid in the passage;
a gas supply means connected to said chamber for providing said chamber with gas whenever at least a portion of said diaphragm reaches a predetermined limit of radial movement away from the liquid passage;
a gas discharge means connected with said chamber for discharging gas from said chamber whenever at least a portion of said diaphragm reaches a predetermined limit of radial movement toward the liquid passage;
means for sealingly closing said chamber whenever said diaphragm moves toward and away from the liquid passage within the range between said limits of radial movement;
and
the total capacity of said chamber and said gas supply means being such that the change of shape of said diaphragm in response to a pulse of liquid in said passage causes a change in the pressure of said gas just sufficient to keep the pressure of the liquid in said liquid passage constant.

5 more elements