Patent application number | Description | Published |
20080289434 | FLUID FLOW MEASURING INSTRUMENT - A measurement control section comprises 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. | 11-27-2008 |
20100064821 | ULTRASONIC FLUID MEASURING DEVICE - An ultrasonic fluid measuring device capable of improving a measuring accuracy is provided. In an ultrasonic fluid measuring device | 03-18-2010 |
20120191382 | ULTRASONIC FLOW METER DEVICE - The present invention implements an ultrasonic flow meter device which does not require a complicated configuration such as a hermetic seal, in an inexpensive and easy manner. A typical ultrasonic flow meter device includes a fluid passage body, a measurement fluid passage placed within the fluid passage body, a pair of ultrasonic sensors, a wall defining the measurement fluid passage and attached with the ultrasonic sensors, a propagation time measuring means for measuring a propagation time of an ultrasonic sound wave propagating between the ultrasonic sensors, and a fluid flow calculating means for calculating a fluid flow based on a propagation time, and a seal member is provided between the fluid passage body and the wall to prevent a fluid from leaking. | 07-26-2012 |
20120255368 | FLOW RATE MEASURING DEVICE - 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. | 10-11-2012 |
20120272748 | ULTRASONIC FLOWMETER - An ultrasonic flowmeter which can enhance measurement accuracy is provided, including ultrasonic transducers; a propagation time measurement block for measuring a propagation time elapsed before an ultrasonic wave transmitted from the ultrasonic transducer arrives at the ultrasonic transducer; a control block for determining a flow volume from the propagation time; correction calculation means for calculating a correction value based on characteristics of the ultrasonic transducers, a delay between transmission of an ultrasonic wave from the ultrasonic transducer and commencement of measurement of a propagation time, a delay between arrival of the ultrasonic wave at the receiving-side ultrasonic transducer and detection of the ultrasonic wave, and a difference between the measured and a true propagation times; and correction value selection means for selecting a correction value; and a propagation time correction block for correcting a propagation time. | 11-01-2012 |
20130036832 | ULTRASONIC FLOW RATE MEASUREMENT UNIT - The ultrasonic flaw-rate measurement unit of the invention includes a flow measurement path inside which fluid to be measured flows through and to which a case accommodating a pair of ultrasonic transducers is installed, a pair of ultrasonic transducers disposed in the flow measurement path, a measuring circuit substrate incorporating a propagation time measuring part measuring a propagation time between the ultrasonic transducer transmitter and receiver and a flow-rate calculating part calculating a flow rate of the fluid to be measured based on the propagation time measured by the propagation time measuring part, and a damping material filling an interior space of the case and covering the pair of ultrasonic transducers. | 02-14-2013 |
20130081477 | FLOW METER DEVICE - In a flow meter device of the present invention, a control means causes a temperature measuring means to singly measure a temperature of a fluid. A flow compensation means calculates a temperature of a fluid from a propagation time and makes compensation for the flow rate using the temperature calculated based on the propagation time in a state in which the temperature is not measured by the temperature measuring means. Thus, when compensation is made for the measured flow rate to derive a flow rate at a desired temperature, flow rate compensation can be implemented with high accuracy, versatility of a target fluid can be improved, and low electric power consumption can be achieved. | 04-04-2013 |
20130269429 | GAS METER APPARATUS - A gas meter apparatus of the present invention comprises a flow measuring device which measures a gas flow; a measurement value calculating section and a liquid crystal display section which are configured to calculate an integrated value of the measured gas flow and electrically display the integrated value. Every time the measurement value calculating section determines that the integrated value has reached 1 liter, it informs a light emission commanding section of determination result. In response to this information, the light emission commanding section causes a LED light emitting section to emit light toward a sensor. Therefore, the gas meter apparatus is able to conduct a test by a test method in which a change in the displayed integrated value of the gas flow can be known from reflected light of emitted light, even when the integrated value of the gas flow is displayed in a digital form. | 10-17-2013 |
20130269447 | FLOW METER 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 Δt 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. | 10-17-2013 |
20130306893 | SHUTOFF VALVE 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. | 11-21-2013 |