JP2009018441A5 - - Google Patents

Claims (5)

A liquid inlet, a liquid outlet, a flexible diaphragm that is displaced in accordance with a liquid pressure between the liquid inlet and the liquid outlet, and a detection unit installation member that has one surface facing the diaphragm. And a liquid detection chamber whose volume changes according to the liquid pressure,
A moving member provided in the liquid detection chamber;
A detection space that communicates with the liquid detection chamber and is partitioned from the liquid detection chamber by the detection unit installation member, and applies vibration to the detection space and detects a residual vibration waveform associated with the vibration. Including a piezoelectric sensor, a detection unit provided on the other surface side of the detection unit installation member,
An urging member that urges the moving member to move toward the detection unit installation member;
Have
The moving member includes a pressure receiving plate and two shafts formed to protrude from the pressure receiving plate, and the pressure receiving plate is attached to the diaphragm and faces the one surface of the detection unit installation member. And
The diaphragm expands until the volume of the liquid detection chamber reaches a predetermined volume when the liquid pressure is a predetermined value, and detects the pressure receiving plate against the urging force of the urging member. Separating from the one surface of the part installation member,
The moving member detects and installs the pressure receiving plate by the urging force of the urging member at the time of liquid detection when the liquid pressure is lower than the predetermined value and at the initial stage of introducing the liquid into the liquid detection chamber. Displacing the diaphragm to a position in contact with the one surface of the member and such that the volume of the liquid detection chamber is smaller than the predetermined volume;
In the initial stage, the moving member has a first flow path for guiding the liquid from the liquid inlet side to the detection space, and a second channel for guiding the liquid from the detection space to the liquid outlet. A flow path,
The liquid detection chamber includes a bearing member that positions each of the two axes in a first direction that is an orthogonal biaxial direction of a two-dimensional plane parallel to the one surface of the detection unit installation member, and the orthogonal biaxial A liquid detection device comprising: a facing member that faces and positions the tip surfaces of the two shafts in the second direction. Oite to claim 1,
In the liquid detection chamber, an opening for exposing and positioning the detection unit installation member is formed at a central position of the liquid detection chamber,
The orthogonal two axes have an intersection at a position coinciding with the center position of the liquid detection chamber. In claim 1 or 2 ,
The bearing member includes two standing members that stand from the liquid detection chamber on both sides of each of the two shafts, and the two standing members have a base end side interval that is a free end side interval. Formed narrower than
When the pressure receiving plate comes into contact with the one surface of the detection installation member, each of the two shafts is located on the base end side of the two upright members. A liquid container containing liquid;
Is connected with the liquid container, and any of the liquid detection device according to claim 1 to 3 wherein the liquid in the liquid containing body is supplied to the liquid inlet,
A liquid container characterized by comprising: A liquid refilling method in which the liquid container is recovered from the market after the liquid in the liquid container according to claim 4 is derived, and the liquid container is refilled with liquid.
Introducing a liquid from the liquid outlet;
While maintaining the liquid remaining in the detection space at the time of recovery, the liquid is discharged from the liquid outlet to the liquid inlet without passing through the second flow path at least. Passing it through; and
Refilling the liquid from the liquid inlet of the liquid detection device toward the liquid container;
A liquid refilling method characterized by comprising: