Check valve, diaphragm pump, and printing apparatus
AssigneeSeiko Epson Corporation
InventorHiroshi Asawa
Life of this patent
Estimating the term…
Abstract
Provided is a check valve including: a duckbill valve; and a support member which is inserted into an inside portion of the duckbill valve, in which the duckbill valve includes a slit which is provided on a side where fluid is discharged, an inflow port which is provided on a side where the fluid flows in, and a flow path which connects the inflow port to the slit, and in which the support member is inserted into the flow path from the inflow port, a hole for sending the fluid to the slit when flowing in from the inflow port is provided, and the hole is provided so as to be hermetically sealed by the duckbill valve when a negative pressure is applied from the inflow port side.
Claims15
A check valve comprising:
- a duckbill valve, the duckbill valve comprising a first wall surface and a second wall surface which are a pair of inclined surfaces extending so as to converge toward a tip end side having the slit;
- and
- a support member which is inserted into an inside portion of the duckbill valve, the support member includes a third wall surface positioned inside the first wall surface and a fourth wall surface positioned inside the second wall surface;
- wherein:
- hardness of the support member is equal to or less than that of the duckbill valve, such that the support member protects the duckbill valve by being worn out first,
- the third wall surface and the fourth wall surface extending toward a hermetically sealed tip edge, and
- a hole for providing liquid toward the sealed tip edge is provided on the third wall surface and does not extend to the fourth wall surface, such that the hole is hermetically sealed by double close contact structure when a negative pressure is applied from the inflow port side.
A check valve comprising:
- a duckbill valve;
- and
- a support member which is inserted into an inside portion of the duckbill valve,
- wherein the duckbill valve includes a slit which is provided on a side where fluid is discharged, an inflow port which is provided on a side where the fluid flows in, and a flow path which connects the inflow port to the slit, and
- wherein the support member is inserted into the flow path from the inflow port, a hole for sending the fluid to the slit when flowing in from the inflow port is provided, and the hole is provided so as to be hermetically sealed by the duckbill valve when a negative pressure is applied from the inflow port side,
- wherein the duckbill valve includes a first wall surface and a second wall surface which are a pair of inclined surfaces extending so as to converge toward a tip end side having the slit, and
- wherein the support member has a third wall surface positioned inside the first wall surface and a fourth wall surface positioned inside the second wall surface, and
- wherein the hole is provided on the third wall surface and does not extend to the fourth wall surface.
Dependencies are inferred from the claim text.