# US 2014/0196538 A1 · Liquid pressure meter, liquid level meter, and warning system

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- Number: US 2014/0196538 A1
- Document ID: US20140196538A1
- Status: Published application
- Kind: A1
- Application number: 14/154,716
- Filed: 2014-01-14
- Published: 2014-07-17
- Earliest claimed: 2013-01-16
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Kenta Sato; Kentaro Yoda; Hisao Motoyama
- Web page: https://patentgrep.com/patent/US20140196538A1

## CPC

- G01F 23/14: by measurement of pressure
- G01F 23/164: {using a diaphragm, bellow as transmitting element}
- G01L 7/08: of the flexible-diaphragm type
- G01L 9/0022: {of a piezoelectric element}
- G01L 9/008: {using piezoelectric devices (piezoelectric resonators G01L9/0022; surface acoustic waves G01L9/0025)}
- G01L 19/149: {of immersion sensor, e.g. where the sensor is immersed in the measuring medium or for in vivo measurements, e.g. by using catheter tips}
- G01F: MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)

## Abstract

A liquid level meter includes: an exterior portion having an internal space which a liquid to be measured flows in; and a pressure sensitive portion provided inside the exterior portion and having a pressure sensitive surface; wherein the exterior has holes that it is arranged on each of a vertically lower side and a vertically upper side relative to the pressure sensitive surface, and the holes connect an inside and outside of the internal space.

## Claims

### Claim 1

A liquid pressure meter comprising:
an exterior portion having an internal space which a liquid to be measured flows in; and
a pressure sensitive portion provided inside the exterior portion and having a pressure sensitive surface;
wherein the exterior portion has holes that it is arranged on each of a vertically lower side and a vertically upper side relative to the pressure sensitive surface, and the holes connect an inside and outside of the internal space.

### Claim 2 (depends on 1)

The liquid pressure meter according to claim 1, wherein an opening on the side of the internal space, of the hole of the vertically lower, is arranged at a position avoiding a center of the pressure sensitive surface as viewed in a plan view of the pressure sensitive surface.

### Claim 3 (depends on 1)

The liquid pressure meter according to claim 1, wherein an opening on an outer side of the exterior portion, of the hole of the vertically lower, is arranged at a position avoiding the pressure sensitive surface as viewed in a plan view of the pressure sensitive surface.

### Claim 4 (depends on 3)

The liquid pressure meter according to claim 3, wherein the hole of the vertically lower has a portion extending in a direction intersecting with a normal line to the pressure sensitive surface from an opening on an outer side of the exterior portion.

### Claim 5 (depends on 1)

The liquid pressure meter according to claim 1, wherein the hole of the vertically lower has a bending portion between an opening on the outer side of the exterior portion and an opening on an inner side of the exterior portion.

### Claim 6 (depends on 1)

The liquid pressure meter according to claim 1, wherein the hole of the vertically lower has at least two, the two of holes communicate with each other within a wall of the exterior portion.

### Claim 7 (depends on 1)

The liquid pressure meter according to claim 1, wherein the hole of the vertically lower has plural bending portions between an opening on the side of the internal space and an opening on an outer side of the exterior portion.

### Claim 8 (depends on 7)

The liquid pressure meter according to claim 7, wherein the hole of the vertically lower has a diverging portion that diverges into plural branch holes at a point in a course from an opening on an outer side of the exterior portion toward an opening on the side of the internal space, and
the bending portion is arranged at the diverging portion and between the diverging portion and the opening on the side of the internal space.

### Claim 9 (depends on 7)

The liquid pressure meter according to claim 7, wherein a depressed portion is arranged in the bending portion.

### Claim 10 (depends on 1)

The liquid pressure meter according to claim 1, wherein the pressure sensitive portion has a pressure sensitive surface facing the internal space, and
an oscillation element that receives a stress corresponding to a displacement of the pressure sensitive surface.

### Claim 11 (depends on 1)

A liquid level meter comprising the liquid pressure meter according to claim 1.