Note opening device for use in the liquid storage container, a liquid storage container having the note inlet device, and the upper wall member

摘要

PPROBLEM TO BE SOLVED: To provide a spout of a new constitution which can further improve the performances such as a liquid cutting, a liquid dripping prevention and a flow rate adjustment, and to provide a liquid storage container having the spout, and an upper wall member which is used for the spout. PSOLUTION: As shown in Fig.4(a), in the spout 10, a dam section for a liquid is formed by a guiding-out section 12 and an upper wall section 14, and a stagnation is generated (A). The stream is stabilized by the reduction of a viscous resistance of the liquid which flows along the boundary (B) of the stagnation, and the liquid reaches the top surface of the upper wall section 14 through an opening side end surface 14a having a roundness in the upper wall section 14 while maintaining the stability of the stream. In addition, the Reynolds number falls as the layer of the stream becomes thinner down on the top surface of the upper wall section 14, and the stream becomes a stable laminar flow. Therefore, the liquid quickly separates from the distal end in the distal end 10a of the spout 10, and the liquid cutting becomes good (F). Also, when the pouring is stopped as shown in Fig.4(b), liquid dripping can be prevented from occurring because the liquid cutting is good. PCOPYRIGHT: (C)2010,JPO&INPIT