An object of the present invention is to perform a suitable registration of a flow rate of appliances to promote the optimization of a usage time limitation function. In a gas shut-off device according to the invention, a flow rate detection unit measures a flow rate, a flow rate calculation unit calculates values of instant flow rates from a detection value, an average flow rate calculation unit obtains an average flow rate from the obtained instant flow rates, a flow rate change decision unit decides the presence or absence of a change in the flow rate based on the obtained average flow rate, a flow rate storage unit stores a value of the obtained average flow rate, an increase flow rate registration unit registers an amount of the flow rate change at the time of increase change decision by the flow rate change decision unit, a decrease flow rate re-registration unit reduces the registered flow rate near an amount of the flow rate change at the time of decrease change decision by the flow rate change decision unit, and re-registers and replaces it with a value of the average flow rate obtained by the average flow rate calculation unit after the reduction of the registered flow rate, and a shut-off unit shuts off the supply of gas when decided as an abnormality by an abnormality decision unit from the registered flow rate and a decision value.

Gas shut-off device

A fluid manifold is capable of channeling and monitoring fluid flow within a fluid distribution system. The manifold includes one or more input lumens. Each input lumen associated with a respective inlet port. The manifold also includes a plurality of output lumens such that each output lumen is associated with a respective outlet port and at least one input lumen is coupled to two or more output lumens. The manifold also includes one or more flow sensors capable of measuring fluid flow parameters of fluid flowing through at least one of the one or more input lumens and the plurality of output lumens. In some implementations, a flow sensor can be mounted to each output lumen of the manifold.

Devices and system for channeling and automatic monitoring of fluid flow in fluid distribution systems

An ultrasonic flowmeter (10) comprises a trigger oscillating apparatus (14); a pulser receiver (16); a transducer (20) responsive to an electric signal from the pulser receiver (16) for emitting ultrasonic pulses toward a measurement line (ML) within a fluid pipe (22); signal processing means (27) for processing an ultrasonic echo signal that is a reflected wave from the transducer (20); flow velocity distribution calculating means (28) for analyzing the processed ultrasonic echo signal to determine the position and velocity of the ultrasonic reflecting body along the measurement line (ML); and flow rate calculating means (29). The signal processing means (27) comprises a filtering part (21) for filtering the ultrasonic echo signal, and an AD converter (17) for performing AD conversion. The trigger oscillating apparatus (14) is adapted to control the timings of signal transmission/reception between the pulser receiver (16) and the AD converter (17), and also adapted to have a predetermined wait time after causing the ultrasonic pulse oscillation and ultrasonic echo signal reception to successively occur a plurality of times. This structure can precisely flowmeter not only fluids that could be conventionally flowmetered but also fluids that are relatively clean and hence conventionally difficult to flowmeter.

Ultrasonic flowmeter and ultrasonic flowmetering method

Active acoustic pyrometry-based gas flow temperature measurement, such as for monitoring of gas turbine combustors, including industrial gas turbine (IGT) combustors is incorporated into the combustion monitoring and control system by addition of an acoustic transmitter or acoustic transceiver that transmits a sound wave in a line-of-sight with a plurality of acoustic sensors, such as dynamic pressure sensors. For temperature measurement, in some embodiments sound transmission time-of-flight that is directed generally transverse the gas flow path is measured by the controller and correlated with gas flow temperature along the line-of-sight. In other embodiments line-of-sight correlated gas flow temperatures in up and down stream planar paths are interpolated. In an integrated thermoacoustic pressure-based sensor and monitoring/control system embodiment, the controller determines absolute active path temperatures with acoustic transmission and time-of-flight analysis techniques.

Active measurement of gas flow temperature, including in gas turbine combustors

Performance of a gas turbine engine is monitored by computing a mass flow rate through the engine. Acoustic time-of-flight measurements are taken between acoustic transmitters and receivers in the flow path of the engine. The measurements are processed to determine average speeds of sound and gas flow velocities along those lines-of-sound. A volumetric flow rate in the flow path is computed using the gas flow velocities together with a representation of the flow path geometry. A gas density in the flow path is computed using the speeds of sound and a measured static pressure. The mass flow rate is calculated from the gas density and the volumetric flow rate.

Nonintrusive performance measurement of a gas turbine engine in real time

An ultrasonic flow rate measurement device includes a measurement channel, through which a fluid to be measured flows; and a sensor fixing casing having openings formed in the measurement channel and sensor fixing cavities communicating with the openings Moreover, the ultrasonic flow rate measurement device includes a pair of ultrasonic sensors contained in the sensor fixing cavities, for measuring the flow rate of the fluid to be measured; and a flow rate measuring unit for detecting the flow rate based on an ultrasonic wave propagation time between the pair of ultrasonic sensors Furthermore, the ultrasonic flow rate measurement device includes a suppressing member formed at each of the openings, for suppressing the fluid to be measured from intruding into each of the sensor fixing cavities, wherein the suppressing member is molded integrally with the sensor fixing casing

Ultrasonic flow rate measurement device

A flow meter device includes: an inlet portion, into which a fluid flows; an outlet portion, from which the fluid flows out; a plurality of measurement passage portions provided parallel to each other between the inlet portion and the outlet portion; and at least one flow rate measurement unit, each flow rate measurement unit being configured to measure a flow rate of the fluid that flows through a passage in a corresponding one of the measurement passage portions Shapes of passages in the respective measurement passage portions coincide with each other The plurality of measurement passage portions include: the one measurement passage portion(s), which is/are each provided with the flow rate measurement unit; and the other measurement passage portion(s), which is/are not provided with the flow rate measurement unit

Flow meter device

For the purpose of solving the above problems, the present invention includes: transmission/reception means provided in a flow path for performing transmission/reception using a state change of fluid; repetition means for repeating the transmission/reception; time measurement means for measuring a time of propagation repeated by the repetition means; flow rate detection means for detecting a flow rate based on a value of the time measurement means; and number-of-times change means for changing to a predetermined number of repetition times. With such a structure, an influence caused by a variation of a flow can be suppressed by changing the number of repetition times so as to be suitable for a variation. As a result, reliable flow rate measurement with a high accuracy can be achieved.

Ultrasonic flowmeter having sequentially changed driving method

Ultrasound flow quantity measurement units (27, 49) are disposed in a flow path (3) wherethrough a fluid to be measured flows, said measurement units comprising: pairs of ultrasound transceivers (5, 6, 42, 44) further comprising piezoelectric bodies (17) and audio adjustment bodies (15); measurement circuits (8) which measure the flow quantity of the fluid to be measured on the basis of a propagation time of an ultrasound pulse between the pairs of ultrasound transceivers; and insulating vibration damping members (13) simultaneously formed to cover at least a portion of a part of the ultrasound transceivers which make contact with the flow path, the piezoelectric bodies, and the measurement circuits, respectively.

Ultrasound flow quantity measurement unit and method for manufacturing same

An ultrasonic flow meter device comprises a fluid passage forming section including a measurement fluid passage, and an opening facing a bottom surface of the measurement fluid passage; a pair of ultrasonic transducers which transmit and receive an ultrasonic wave via the opening; a partition plate which partitions the measurement fluid passage; and an identification section provided on an end surface of the partition plate and used to identify an obverse surface and a reverse surface of the partition plate.

Yuji Fujii

Papers

Ultrasonic flow rate measurement device

Flow meter device

Ultrasonic flowmeter having sequentially changed driving method

Ultrasound flow quantity measurement unit and method for manufacturing same

Ultrasonic flow meter device