Pulsation damper and fuel pump device

Patent metadata

Field	Value
Publication number	US-2018328322-A1
Application number	US-201815915241-A
Country	US
Kind code	A1
Filing date	Mar 8, 2018
Priority date	May 11, 2017
Publication date	Nov 15, 2018
Grant date	—

Abstract

A pulsation damper includes: a case in which a fuel chamber is defined; and a damper unit arranged in the fuel chamber to attenuate pressure pulsation of fuel. The damper unit has a diaphragm that is elastically deformed by receiving pressure of fuel, and a plate having a rigidity higher than that of the diaphragm. A gas chamber is defined between the diaphragm and the plate joined with each other.

First claim

What is claimed is:

1 . A pulsation damper comprising:
a case in which a fuel chamber is defined; and a damper unit arranged in the fuel chamber to attenuate pressure pulsation of fuel, wherein the damper unit has a diaphragm that is elastically deformed by receiving pressure of fuel, and a plate having a rigidity higher than that of the diaphragm, wherein a gas chamber is defined between the diaphragm and the plate joined with each other.

2 . The pulsation damper according to claim 1 , wherein
the plate has a protrusion part projected to enlarge or reduce the gas chamber.

3 . The pulsation damper according to claim 2 , wherein the damper unit is one of a plurality of damper units arranged in a predetermined direction in the fuel chamber, the pulsation damper further comprising:
a spacer that defines a distance of a space between the diaphragms adjacent to each other in the predetermined direction, wherein the spacer has a regulation part in contact with the protrusion part to restrict the damper unit from moving in a direction perpendicular to the predetermined direction.

4 . The pulsation damper according to claim 3 , wherein
the regulation part has a contact surface in contact with the protrusion part, and the contact surface has a taper shape inclined to the predetermined direction.

5 . The pulsation damper according to claim 2 , wherein
the protrusion part has an annular shape surrounding a center of the plate.

6 . The pulsation damper according to claim 1 , further comprising:
a spacer that defines a distance of a space between the diaphragm and an opposite component opposing the plate through the diaphragm, wherein the spacer is integrally fixed with the damper unit.

7 . The pulsation damper according to claim 1 , wherein
the damper unit is one of a plurality of damper units arranged in the fuel chamber.

8 . A fuel pump device comprising:
a fuel pump that compresses and discharges fuel flowing in a fuel passage defined in a pump body; and a pulsation damper that reduces pressure pulsation of the fuel in the fuel passage, wherein the pulsation damper includes a case in which a fuel chamber is defined, and a damper unit arranged in the fuel chamber to attenuate pressure pulsation of fuel, wherein the damper unit has a diaphragm that is elastically deformed by receiving pressure of fuel, and a plate having a rigidity higher than that of the diaphragm, wherein a gas chamber is defined between the diaphragm and the plate joined with each other.

Assignees

• Denso Corp

Inventors

• Kashiwagi Daisuke
• Shimai Hiroyuki

Classifications

• 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

• F04B11/0016

  with a fluid spring · CPC title

• F16L55/04

  Devices damping pulsations or vibrations in fluids {(F16L55/02 takes precedence)} · CPC title

• F16L55/053

  the gas in the reservoir being separated from the fluid in the pipe · CPC title

• F16L55/041

  specially adapted for preventing vibrations (flexible pipe connections F16L27/10) · CPC title