Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Matsushita Electric Co., Ltd.

Panasonic Holdings Corporation

Yuji Nakabayashi

Akihisa Adachi

Yuji Fujii

Fumikazu Shiba

Daisuke Bessyo

Aoi Watanabe

Hirokazu Gotou

Masahiko Hashimoto

Toshiharu Sato

Naoyoshi Maehara

Takahiro Matsumoto

Shuji Abe

Yasuhiro Umekage

Kenzo Ohji

Yukio Nagaoka

Osamu Eguchi

Yukio Sakaguchi

Yasuharu Kawano

Kouichi Takemura

Hidetomo Nagahara

Masato Satou

Masaki Sugiyama

Hideaki Morihana

Shigeru Iwanaga

Makoto Shibuya

Shigeru Kusunoki

Koichi Takemura

Kenji Yasuda

Hiroshi Nakai

Naoto Naganuma

Hideki Kinoshita

Susumu Kiritoshi

Shiro Takeshita

A flow rate measurement device of the present invention includes a flow rate signal detection unit for detecting a flow rate signal of a fluid to be measured flowing through flow path, flow rate calculation unit for calculating a flow rate from the flow rate signal detected by the flow rate signal detection unit, and oscillation circuit for generating a reference clock. Furthermore, the flow rate measurement device includes temperature calculation unit for calculating a temperature from a frequency change resulting from a temperature change of oscillation circuit, and flow rate correction unit for correcting the flow rate calculated by the flow rate calculation unit by obtaining an offset flow rate at a desired temperature based on the temperature calculated by temperature calculation unit. Thus, accuracy of flow rate measurement can be improved.

Flow rate measurement device

A measurement unit includes a fluid inlet to let a fluid flow in, a fluid outlet to let the fluid flow out, and a single flow path connecting the fluid inlet with the fluid outlet. The measurement unit further includes a plurality of partition boards and a measuring instrument. The plurality of partition boards are disposed along a current of the fluid and between facing side surfaces of the flow path. The plurality of partition boards define M flow path segments (where M is an integer of 2 or greater) between the facing side surfaces. The measuring instrument measures a flow rate of the fluid flowing through N successively adjacent flow path segments (where N is an integer of 1 or greater and less than M).

Measurement unit and flow rate meter

A flow-rate measurement device which measures a flow rate of a fluid flowing through a fluid flow channel unit includes a tubular measurement flow channel unit that is stored in the fluid flow channel unit and has an inside in communication with the fluid flow channel unit. The flow-rate measurement device also includes a pair of sealing materials that blocks a flow of a fluid and is provided to encircle outer peripheries of the measurement flow channel unit at a first end and a second end; and a measurement unit including a substrate, on which a measurement circuit is mounted, and a pair of ultrasonic transducers. Further, the pair of ultrasonic transducers is electrically and fixedly connected to the substrate in the measurement unit, and the measurement unit is disposed between the pair of sealing materials on the measurement flow channel unit.

Flow-rate measurement device

A flow meter device includes plural fluid passages which are provided between an inlet section into which a fluid flows and an outlet section from which the fluid flows out, and through which the fluid flows and flow value measuring units installed in the plural fluid passages, respectively. The flow value measuring units are configured to measure flow values of the fluid flowing through the fluid passages. The flow meter device further includes a control unit configured to determine whether or not to cause one or more of the flow value measuring units to stop a measuring operation of the flow value based on the flow values measured by the flow value measuring units. The control unit is further configured to determine whether or not to cause the one or more of the flow value measuring units to resume the measuring operation of the flow value, based on the flow value measured by the flow value measuring unit as a monitoring measuring unit which is other than the one or more of the flow value measuring units and is activated to perform the measuring operation of the flow value.

Flow meter device

A gas meter device of the present invention includes an inlet into which a fluid flows, and an outlet from which the fluid flows out, and is configured to derive a flow value of the fluid flowing from the inlet to the outlet. The gas meter device comprises plural measurement fluid passages provided in parallel between the inlet and the outlet; flow value measuring units provided in the plural measurement fluid passages, respectively, and configured to independently measure flow values of fluids flowing through the measurement fluid passages, respectively; an average flow value calculation unit configured to derive an average flow value of the flow values measured by the flow value measuring units, respectively; and a flow value comparison unit configured to obtain index values indicating a relation between the average flow value derived by the average flow value calculation unit and the flow values measured by the flow value measuring units, and determine whether or not each of the index values is equal to or larger than a predetermined value. Thereby, the present invention can determine whether or not there is an erroneous measurement flow value from only the separate flow values independently measured in the measurement fluid passages, respectively.

Fluid meter device

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

A gas meter device of the present invention comprises plural measurement fluid passages provided in parallel between an inlet into which a fluid flows, and an outlet from which the fluid flows out; flow value measuring sections provided in the measurement fluid passages, respectively, and configured to obtain flow values of fluids flowing through the measurement fluid passages, respectively; memories configured to store coefficient data which are values corresponding to the measurement fluid passages, respectively and indicating a relation between the flow values of the fluids flowing through the measurement fluid passages, respectively, and a total flow value of the fluid flowing from the inlet to the outlet; and total flow value estimation sections configured to estimate total flow values of the fluids based on the flow values obtained by the flow value measuring sections, respectively, and the coefficient data stored in the memories. This makes it possible to reduce time required for adjustment work in manufacturing steps of the fluid meter device assembled by connecting the plural measurement fluid passages in parallel.

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.

To measure the propagation time of an ultrasonic signal, the flow rate measuring device of the present invention has amplifier for amplifying a received signal, reference-voltage changing part, reference-voltage setting part, and reference comparator for comparing between the received signal waveform and reference voltage. Reference-voltage changing part changes the reference voltage according to the amplification degree of the amplified waveform of the received signal in amplifier. Comparing the changed reference voltage with the received signal waveform enhances stability in calculation of the propagation time. This prevents measurement accuracy of the flow velocity and the flow rate of fluid to be measured from degradation.

Flow rate measuring device

In a flow meter device of the present invention, a time measuring section of the flow meter device includes a first counter which starts counting at a starting point of measurement of propagation time; and a second counter which starts counting at an end point of the measurement of the propagation time, and performs counting at a higher speed than the first counter. A propagation time TO is finally obtained by subtracting time &#x394;t which is measured by the second counter and passes from the end point until the first counter counts up, from time T which is measured by the first counter and passes from a starting point until the first counter counts up after the end point. A flow calculating section calculates a flow with high accuracy using the propagation time TO. Thus, lower electric power consumption can be achieved, and accuracy of measurement of flow can be improved.

When a flow rate is equal to or more than a reference flow rate, a reference voltage is changed to a level capable of measuring stably to thereby realize the improvement of measurement accuracy at the time of a large amount of flow rate. A flow rate determination means compares a flow rate calculated by a flow rate calculation means with the reference flow rate. When the calculated flow rate is larger than the reference flow rate, the reference voltage set by a reference voltage setting means is changed, whereby the zero cross point can be detected stably at the portion where the degree of the influence of the change in the amplitude of the received signal is small. Thus, it is possible to provide a flow rate measuring device capable of measuring a flow rate stably with high accuracy even when a fluid flow is disturbed due to a large amount of flow rate.

The present invention is directed to an ultrasonic flow rate measuring device capable of improving the measurement accuracy. Such an ultrasonic flow rate measuring device comprises first to third ultrasonic flow rate sensors in the measurement passage which are equipped with first ultrasonic wave transmitter-receivers and second ultrasonic wave transmitter-receivers. First to third ultrasonic wave propagation paths connecting the first ultrasonic wave transmitter-receiver and the second ultrasonic wave transmitter-receivers, respectively, intersect at different angles with the flow direction of fluid flowing through the measurement passages. The ultrasonic flow rate measuring device of the present invention obtains a flow rate measurement selectively from one of the first to third ultrasonic flow rate sensors in response to a flow rate Q.

Ultrasonic flow rate measuring device having a plurality of ultrasonic flow rate sensors

An ultrasonic flow rate measuring device according to the present invention improves a measuring accuracy. An ultrasonic flow rate measuring device includes an ultrasonic measuring portion in which a first ultrasonic transmitter-receiver and a second ultrasonic transmitter-receiver are provided to a measurement passage, and first to fifth partitioning plates are set substantially in parallel with an ultrasonic wave propagation path that connects the first ultrasonic transmitter-receiver and the second ultrasonic transmitter-receiver, whereby first to sixth flat passages are laminated/formed in the measurement passage by the partitioning plates. In this ultrasonic flow rate measuring device, the first ultrasonic transmitter-receiver and the second ultrasonic transmitter-receiver are arranged such that the ultrasonic measuring portionmeasures the flow rate of the flat passage that is offset from the center along the lamination direction of the flat passages.

Ultrasonic flow rate measuring device

A measurement control section includes a time measuring section for controlling an operation of measuring a travel time of an ultrasonic wave. The measurement control section operations, based on a high rate clock signal supplied from a ceramic oscillation circuit during the time measuring operation. A clock control section stops the high rate clock signal supplied from the ceramic oscillation circuit every time when the time measuring section completes its time measuring operation, and uses a low rate clock signal supplied from a quartz oscillation circuit to count a standby time between the end of measuring the travel time and the start of carrying out the next measuring operation.

Fluid flow measuring instrument

An ultrasonic flowmeter includes a 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.

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Nara, Japan

Yuji Nakabayashi