Check valve, diaphragm pump, and printing apparatus

Abstract

The invention provides a check valve which is beneficial for stable pressure feeding of fluid, a diaphragm pump, and a printing apparatus using the check valve and the diaphragm pump. The check valveis characterized by 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 aside 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.

Description

technical field [0001] The present invention relates to a check valve, a diaphragm pump having the check valve, and a printing device provided with the diaphragm pump. Background technique [0002] Conventionally, a diaphragm pump is used as a pump for pressure-feeding a fluid. The diaphragm pump has: a fluid suction and discharge chamber that is divided and formed by a diaphragm in the housing, and whose volume is changed by elastic deformation of the diaphragm; and a diaphragm pump part that is connected to the fluid suction and discharge chamber and has an inlet channel and an outlet channel , wherein the inlet channel is connected to the fluid suction and discharge chamber via a first one-way valve that only allows fluid flow in the direction of the fluid suction and discharge chamber, and the outlet channel is connected to the fluid suction and discharge chamber through a first check valve that only allows fluid flow in the direction of flowing out of the fluid suction ...

AI Technical Summary

Problems solved by technology

In the state where the polymer foreign matter is accumulated in this way, when the contact, separation and sliding between the duckbill valve and the support member are repeated due to the continued use of the diaphragm pump, the thickness of the duckbill valve, which is thinner and softer than the support member, will The inner side will be thinned by polymerized foreign matter, which may cause breakage

[0005] In addition, in the duckbill valve, even in the slit that becomes the outlet of the fluid in the open state and the check valve in the closed state, the opening and closing of the slit is repeated due to the pressure feeding of the UV ink. Closed (contact and separation) to attach and accumulate polymeric foreign matter, which may lead to a drop in infusion capability in the open state or a decrease in sealing performance in the closed state

[0006] In addition, even in a diaphragm pump, polymerized foreign matter is generated due to the repeated contact and separation and sliding of the diaphragm deformed by the pressure feeding of the UV ink and the fluid suction and discharge chamber of the housing, and the polymerized foreign matter is absorbed by the liquid flow. Carrying and attaching to and accumulating on the support member or duckbill valve, which may lead to a decrease in infusion capacity or sealing performance

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