Pulsation damper

A pulsation damper comprising:

• an upper diaphragm;
• a lower diaphragm configured to form a sealed space having a predetermined pressure with the upper diaphragm, in which an inert gas is filled;
• and
• a deformation suppressing member formed of an elastic material, and comprising an inner cylindrical portion, and an extension portion extending from a center portion on an outer peripheral surface of the inner cylindrical portion such that the extension portion extends outward from a center axis of the inner cylindrical portion,
• wherein the deformation suppressing member is arranged inside the sealed space such that an outer periphery of the extension portion abuts against inner walls of the upper diaphragm and the lower diaphragm,
• wherein on an outer peripheral portion of the extension portion is formed a first passage that communicates a first space surrounded by an outer peripheral surface of the extension portion, the upper diaphragm and the lower diaphragm, with a second space on an upper-diaphragm side of the extension portion and a third space on a lower-diaphragm side of the extension portion, and
• wherein at least either a contact portion of the outer peripheral portion of the extension portion with the upper diaphragm or a contact portion of the outer peripheral portion of the extension portion with the lower diaphragm is formed of a curved surface.

A pulsation damper comprising:

• a diaphragm;
• a plate-like member configured to form a sealed space having a predetermined pressure with the diaphragm, in which an inert gas is filled;
• and
• a deformation suppressing member formed of an elastic material, and comprising an inner cylindrical portion, and an extension portion extending from a center portion on an outer peripheral surface of the inner cylindrical portion such that the extension portion extends outward from a center axis of the inner cylindrical portion,
• wherein the deformation suppressing member is arranged inside the sealed space such that the deformation suppressing member abuts against inner walls of the diaphragm and the plate-like member, and
• wherein a second passage communicating an inner side with an outer side of the inner cylindrical portion is formed on at least either a diaphragm side or a plate-like member side of the inner cylindrical portion.