Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Naoto Naganuma

Masaki Sugiyama

Hideaki Morihana

Hiroto Fukui

Hidetomo Nagahara

Masato Satou

Masanobu Teraji

Yuji Nakabayashi

Akihisa Adachi

Takehiko Shigeoka

Hiroshi Nakai

Masaki Yamaguchi

Hiroaki Katase

Ultrasonic flowmeter includes fluid flow path through which a measurement target fluid flows and a pair of ultrasonic transducers that can transmit and receive an ultrasonic signal. The ultrasonic flowmeter further includes flow rate calculator that calculates a flow velocity or flow rate of a measurement target fluid. In addition, fluid flow path includes a main flow path including a plurality of divided flow paths obtained by dividing a flow path having a rectangular cross-section by the same width, and a sub flow path including an added flow path having the same width as that of the divided flow path and having a height lower than that of the divided flow path. Furthermore, flow rate calculator calculates the flow rate of the measurement target fluid flowing through the fluid flow path from the flow velocity or flow rate of the measurement target fluid obtained based on the propagation time.

Ultrasonic flowmeter

Flow meter

A gas meter includes a meter body having a meter inlet into which a fluid-to-be-measured is to flow and a meter outlet from which the fluid-to-be-measured is to flow out, and an extended section extending from the meter inlet to an interior of the meter body. The gas meter further includes a flow rate measurement unit inside the meter body, the flow rate measurement unit having a measurement flow passage having a straight tubular shape, a lead-in port and a lead-out port for the fluid-to-be-measured, and a shutoff valve in an internal passage of the extended section. The lead-in port is airtightly connected to the extended section so as to communicate with the internal passage.

Gas meter including a measurement unit in communication with a shutoff valve in an extended section within a meter body

A gas flowmeter includes: device body () which accommodates a fluid to be measured; inlet pipe () through which the fluid to be measured flows into device body (); and outlet pipe () through which the fluid to be measured flows out from device body () through connecting pipe (). The gas flow meter also includes: ultrasonic flow rate measuring unit () which has a first end side connected to outlet pipe () and performs flow rate measurement of the fluid to be measured which flows in ultrasonic flow rate measuring unit (); and connecting pipe () which is disposed between ultrasonic flow rate measuring unit () and outlet pipe (), and is connected to outlet pipe (). The gas flow meter further includes support member () which supports a second end side of ultrasonic flow rate measuring unit ().

Gas flowmeter

A gas flowmeter includes: a device body which air-tightly accommodates a fluid to be measured; an inlet pipe through which the fluid to be measured is made to flow into the device body; and an outlet pipe through which the fluid to be measured is made to flow out from the device body. The gas flowmeter further includes: an ultrasonic flow rate measuring unit which is connected to the outlet pipe and measures a flow rate of the fluid to be measured which flows in the ultrasonic flow rate measuring unit; a connecting pipe which is connected to the outlet pipe; and a flow passage member which is connected to the connecting pipe and has a flow passage shape identical to a shape of the ultrasonic flow rate measuring unit. The gas flowmeter is provided with a support member which fixes the ultrasonic flow rate measuring unit and the flow passage member to each other. With such a configuration, a gas flow meter capable of performing stable flow rate measurement can be implemented.

Flowmeter having a flow measuring unit and a flow passage member in a single housing

A shutoff valve according to the present invention includes: a motor configured to cause a rotating shaft to rotate; a lead screw formed on the rotating shaft; a lead nut into which the lead screw is screwed; and a valve element configured to block a passage, the valve element being configured to move in an axial direction in accordance with rotation of the rotating shaft. A dry lubricating coating is formed on a contact surface where the lead screw and the lead nut come into contact with each other. A thread pitch of the lead screw is set such that a current applied to the motor, the current being in relation to an inductance of the motor, is in a range that does not cause explosion of the fuel gas and that allows thrust force necessary for moving the valve element to be obtained.

Shutoff valve device

By removably disposing a fluid cutoff device in a gas piping, a gas cutoff management function for remote cutting-off/return, etc., can be added to an existing flow measuring unit, and a communicating portion can make bidirectional communications, so that by transmitting an acceptance state of a remote operation from the external device to the external device, higher reliability and safety can be realized, and by detecting use with the fluid cutoff device removed, safety can be further improved while unauthorized use is prevented.

Growing community of inventors

Nara, Japan

Naoto Naganuma