Damper device with a plurality of stacked diaphragms coupled together by a coupler having holders forming a space provided between a peripheral weld of the diaphragms and the coupler

A damper device provided in a flow passage of a fluid,

• the damper device comprising:
• a plurality of diaphragm dampers that are stacked together, each of the plurality of diaphragm dampers including a first flexible portion including a first diaphragm and a first cover member, a second flexible portion including a second diaphragm and a second cover member, and a rim including a welded portion, peripheral edges of the first diaphragm and the first cover member and peripheral edges of the second diaphragm and the second cover member being welded together in the welded portion, each of the plurality of diaphragm dampers being configured to seal a gas in an inner region between the first diaphragm of the first flexible portion and the second diaphragm of the second flexible portion, and
• a coupler that couples the plurality of diaphragm dampers together, the coupler including holders that hold the rims of the plurality of diaphragm dampers, a space being provided between the coupler and the welded portion of each of the plurality of diaphragm dampers such that the coupler does not contact the welded portion of each of the plurality of diaphragm dampers.