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1. 发明专利

JPH11230810A FLOWMETER 失效
公开(公告)号：JPH11230810A
公开(公告)日：1999-08-27
申请号：JP34519698
申请日：1998-12-04
申请人： OSAKA GAS CO LTD , KANSAI GASMETER KK
发明人： OKABAYASHI MAKOTO , KAIRIKU TSUTOMU , IKADA TAKAOMI , KONO AKIO , KOBAYASHI SHUN
IPC分类号： G01F1/00 , G01F7/00
摘要： PROBLEM TO BE SOLVED: To provide a flowmeter wherein switching between a large-flow flowmeter and a small-flow flowmeter is automatically and stably performed according to flow rate, and further, amount of gas flow ranging from small flow to large flow is measured at wide range with precision. SOLUTION: Related to a flowmeter comprising a large-flow flowmeter 7 and a small-flow flowmeter 5, a switching valve 9 which opens/closes an opening part 8 for flowing large-flow fluid, a diaphragm which oscillates according to pressure difference between upper stream side and lower stream side of the small-flow flowmeter 5, and a connection mechanism for interlocking oscillation of the diaphragm with opening/closing operation of opening part by the switching valve 9, are provided. Magnet circuits 32 and 33 keep open state of the opening part of the switching valve 9 or closed state of the it.

2. 发明专利

JPH10170318A ULTRASONIC FLOW-VELOCITY MEASURING APPARATUS 失效
公开(公告)号：JPH10170318A
公开(公告)日：1998-06-26
申请号：JP33180796
申请日：1996-12-12
申请人： OSAKA GAS CO LTD , KANSAI GASMETER KK
发明人： OKAMURA SHIGENORI , IKADA TAKAOMI , TOMITA AKIO , KONO AKIO , KOBAYASHI SHUN , YASUDA TETSUYA
IPC分类号： G01P5/00 , G01F1/66
摘要： PROBLEM TO BE SOLVED: To obtain an ultrasonic flow-velocity measuring apparatus in which phases of reflected ultrasonic waves are put in order so as to acquire coherent received waves and whose measuring accuracy can be ensured sufficiently by a method wherein an oval-shaped measuring part is formed inside a measuring pipe and transducers are arranged and installed in both focal positions of it. SOLUTION: An oval-shaped body shell 7 is installed in a measuring part 1a inside an ultrasonic flow-velocity measuring pipe 1, and transducers 2, 3 are arranged and installed in both focal positions of it. When ultrasonic waves are transmitted from a transmitting element at the transducer 2, a part of the ultrasonic wave reaches a receiving element at the transducer 3 as rectilinear propagation waves. However, the greater part of the ultrasonic waves are reflected only once by the inside wall of the oval-shaped body shell 7 so as to reach the receiving element at the transducer 3 in the focal position on the other side in the same time. Consequently, received waves which are output from an amplifier circuit 5 are changed into coherent waves in which phases are put in order and in which the reflected ultrasonic waves are overlapped. Then, a changeover circuit 6 is changed over, ultrasonic waves are transmitted from the transducer 3, and coherent waves are output from the circuit 5 in the same manner. Consequently, it is possible to obtain the measuring pipe 1 whose measuring accuracy can be ensured sufficiently.

3. 发明专利

JPH1073463A METHOD FOR MEASURING FLOW VELOCITY USING ULTRASONIC WAVE 失效
公开(公告)号：JPH1073463A
公开(公告)日：1998-03-17
申请号：JP22875896
申请日：1996-08-29
申请人： OSAKA GAS CO LTD , KANSAI GASMETER KK
发明人： OKAMURA SHIGENORI , IKADA TAKAOMI , TOMITA AKIO , KONO AKIO , NAKAMURA EIJI , YASUDA TETSUYA
IPC分类号： G01P5/00 , G01F1/66
摘要： PROBLEM TO BE SOLVED: To surely recognize and catch a plurality of waves of receiving waves and secure sufficient measurement accuracy, by impressing a plurality of phase adjustment pulses of the same frequency as a resonant frequency of an ultrasonic transmitting receiving element after a driving pulse. SOLUTION: Subsequent to a first wave P of a driving pulse, phase adjustment pulses Pf of the same or approximately the same frequency as a resonant frequency of an ultrasonic transmitting receiving element are impressed to the ultrasonic transmitting receiving element. In consequence, vibrations of the phase adjustment pulses Pf are overlapped and added to a vibration by the first wave P, so that the vibrations are continued without being attenuated while the phase adjustment pulse Pf is output. Received waves W, W' are accordingly not attenuated suddenly showing a waveform with a uniformed phase and an amplitude necessary for measurements secured. Propagation time differences t1-t5 are measured by comparing reach timings of first - fifth waves W1-W5, thereby to obtain five measurement data. A flow velocity of a fluid is obtained from an averaged propagation time difference.

4. 发明专利

JPH09318644A ULTRASONIC FLOW VELOCITY MEASURING METHOD 失效
公开(公告)号：JPH09318644A
公开(公告)日：1997-12-12
申请号：JP13164496
申请日：1996-05-27
申请人： OSAKA GAS CO LTD , KANSAI GASMETER KK
发明人： OKAMURA SHIGENORI , IKADA TAKAOMI , TOMITA AKIO , KONO AKIO , NAKAMURA EIJI
IPC分类号： G01P5/00 , G01F1/66 , G01S11/14
摘要： PROBLEM TO BE SOLVED: To surely determine the received wave arrival timing and measure the flow velocity with high accuracy by integrating the waves of one or both polarities of the received waves, and setting the time when the integrated output reaches the reference value to the received wave arrival timing for measuring the propagation time difference. SOLUTION: Received waves from transceivers 2, 3 are half-wave shaped by a half-wave shaping circuit 7 through an amplifying circuit 5, and the integrated output from an integrating circuit 8 is compared with the reference voltage from a reference voltage generating circuit 10 by a comparing circuit 9. The reference voltage is set to the middle value where the integrated output rises synchronously with the rise of the half wave of the second wave, thus the integrated output reaches the reference voltage value at the middle time when it rises along the rise of the second wave beyond the peak value of the first wave, and the received wave arrival signal is outputted from the comparing circuit 9 at this time. When the received signal is integrated, the integrated output can be increased in response to the received wave-form, and the first wave of the received wave is not required to be captured.

5. 发明专利

JP2002131105A ULTRASONIC FLOW RATE MEASURING METHOD 失效
公开(公告)号：JP2002131105A
公开(公告)日：2002-05-09
申请号：JP2000326446
申请日：2000-10-26
申请人： OSAKA GAS CO LTD , KANSAI GASMETER KK
发明人： IWAKAWA MEGUMI , MINAMI TADAYUKI , TAGAWA SHIGERU , KONO AKIO , NAKAMURA EIJI , ESHITA KAZUO , YASUDA TETSUYA
IPC分类号： G01F1/66
摘要： PROBLEM TO BE SOLVED: To provide a measuring method of ultrasonic flow rate being able to more accurately specify the arrival timing of an ultrasonic and then ensure an adequate measurement accuracy. SOLUTION: In the ultrasonic flow rate measuring method, each ultrasonic transducer 2, 3 is positioned opposite to upstream and downstream sides of fluid to be measured, respectively, these ultrasonic transducers 2 and 3 mutually generate and transmit an ultrasonic as well as receiving the transmitted ultrasonic each other to measure flow rate of the fluid based on the propagation time of respective ultrasonic obtained from each received wave. The point in time when maximum half-wave Wp of the above received wave W has reached a reference voltage value E is defined as the arrival timing of the ultrasonic.

6. 发明专利

JP2002131104A ULTRASONIC FLOW RATE MEASURING SYSTEM 失效
公开(公告)号：JP2002131104A
公开(公告)日：2002-05-09
申请号：JP2000326445
申请日：2000-10-26
申请人： OSAKA GAS CO LTD , KANSAI GASMETER KK
发明人： MATSUSHITA HIROSHI , MINAMI TADAYUKI , TAGAWA SHIGERU , KONO AKIO , NAKAMURA EIJI , MATSUDA TOSHIFUMI , YASUDA TETSUYA
IPC分类号： G01F1/66
摘要： PROBLEM TO BE SOLVED: To provide a measuring method of ultrasonic flow rate which can fully lengthen path length of a ultrasonic wave and then ensure an adequate measurement accuracy. SOLUTION: This system is provided with a double-layered zigzag flow rate measuring section 14 formed within its flow rate measuring tube 1, and an ultrasonic reflection member 15 allowing an incident ultrasonic from a turning section 14a of the flow rate measuring section 14 entered from the first- layered flow rate measuring section 14 to reflect toward the adjoining second- layered flow rate measuring section 14 with the turning section 14a between. Thus the ultrasonic transmitted from a sending ultrasonic transducer 2 is reflected at the ultrasonic reflection member 15 of the turning section 14a on the flow rate measuring section 14 after passing through the first-layered flow rate measuring section 14, passing through the second-layered flow rate measuring section 14 to be received in a receiving ultrasonic transducer 3. As a result, path length of the ultrasonic wave can adequately be lengthened.

7. 发明专利

JPH11148848A METHOD FOR JUDGING PULSE SKIP IN MEASURING ULTRASONIC WAVE PROPAGATION TIME 失效
公开(公告)号：JPH11148848A
公开(公告)日：1999-06-02
申请号：JP31513097
申请日：1997-11-17
申请人： OSAKA GAS CO LTD , KANSAI GASMETER KK
发明人： OKAMURA SHIGENORI , TOMITA AKIO , IKADA TAKAOMI , YOSHIOKA TORU , KONO AKIO , NAKAMURA EIJI , YASUDA TETSUYA
IPC分类号： G01P5/00 , G01F1/66
摘要： PROBLEM TO BE SOLVED: To provide a method for judging pulse skip which judges whether a pulse skip has occurred or not. SOLUTION: A transmitter and a receiver are provided with an interval in a medium, and the ultrasonic wave transmitted from the transmitter is detected with the receiver, and the propagation time of ultrasonic wave in a medium is measured based on a time point when the level of a reference pulse P1 in a pulse train forming a reception oscillation wave reaches a threshold value VTH. Here, the measurement is continuously performed by a plurality of times to obtain a maximum value and a minimum value of the propagation time. When the difference between the maximum value and the minimum value corresponds to the oscillation cycle of a ultrasonic wave element, a pulse skip wherein a next pulse P3 skips the reference pulse P12 to reach the threshold value VTH is judged to have occurred.

8. 发明专利

JPH1038650A ULTRASONIC FLOW VELOCITY MEASURING METHOD 失效
公开(公告)号：JPH1038650A
公开(公告)日：1998-02-13
申请号：JP19236096
申请日：1996-07-22
申请人： OSAKA GAS CO LTD , KANSAI GASMETER KK
发明人： OKAMURA SHIGENORI , IKADA TAKAOMI , TOMITA AKIO , KONO AKIO , NAKAMURA EIJI , YASUDA TETSUYA
IPC分类号： G01P5/00 , G01F1/66
摘要： PROBLEM TO BE SOLVED: To secure sufficiently high measuring accuracy by surely recognizing the first half wave of received waves by forming the first wave of a driving pulse impressed upon an ultrasonic transmitting element in a triangular wave which rises gently and falls steeply. SOLUTION: The first wave P1 of a driving pulse P outputted from a pulse generating circuit is formed in a triangular wave which rises gently P11 and falls steeply P12 . Consequently, the waveform of the received wave which is received by means of and outputted from a receiver becomes that of the received wave W shown in the figure. Namely, the first half wave W1 of the received wave W corresponding to the steeply falling section P12 of the triangular wave P1 becomes such a waveform that becomes the highest at the peak value and descends after the peak value. Accordingly, when, for example, the half wave W1 is not able to be caught, because the reference level for measuring propagating time difference fluctuates and exceeds the peak value of the half wave W1 of the received wave W1 no output is generated. Therefore, the measuring accuracy of an ultrasonic flow rate measuring method can be secured, because the measurement can be discriminated as invalid and the possibility of catching the second half wave W2 and waves after the half wave W2 is eliminated.

9. 发明专利

JPH1019619A METHOD OF ULTRASONIC MEASURING FLOW VELOCITY 失效
公开(公告)号：JPH1019619A
公开(公告)日：1998-01-23
申请号：JP16911596
申请日：1996-06-28
申请人： OSAKA GAS CO LTD , KANSAI GASMETER KK
发明人： OKAMURA SHIGENORI , IKADA TAKAOMI , TOMITA AKIO , KONO AKIO , NAKAMURA EIJI
IPC分类号： G01P5/00 , G01F1/66 , G01S11/14
摘要： PROBLEM TO BE SOLVED: To enhance the precision of flow velocity measurement by monitoring the peak value in a received wave and controlling the amplitude value of the received wave so that the peak value is constant for each received wave. SOLUTION: A transmitted wave is transmitted from a transmitter-receiver 2 on the upstream side of a fluid and received by a transmitter-receiver 3 on the downstream side. The integrated output of an integrating circuit 8 is compared with the reference voltage of a reference voltage generating circuit 10 by a first comparing circuit 8, and when the integrated output reaches a reference voltage value, a spare signal is outputted. On the other hand, the received wave amplified by an amplifying circuit 5 is compared with zero volt by a second comparing circuit 11, and a zero cross signal is outputted. The spare signal and the zero cross signal are inputted to an AND circuit 12, which then outputs a received wave arrival signal, and determines the received wave arrival timing. A control circuit 14 monitors the output value of a peak hold circuit 13, and controls the amplifying circuit 5 to minimize the amplified value in the amplifying circuit 5 when the output value is increased, and to increase it when the output value is minimized.

10. 发明专利

JP2002214010A ULTRASONIC FLOW VELOCITY MEASURING APPARATUS 失效
公开(公告)号：JP2002214010A
公开(公告)日：2002-07-31
申请号：JP2001019868
申请日：2001-01-29
申请人： OSAKA GAS CO LTD , KANSAI GASMETER KK
发明人： MATSUSHITA HIROSHI , MINAMI TADAYUKI , TAGAWA SHIGERU , KONO AKIO , NAKAMURA EIJI , MATSUDA TOSHIFUMI , YASUDA TETSUYA
IPC分类号： G01F1/66
摘要： PROBLEM TO BE SOLVED: To provide an ultrasonic flow velocity measuring apparatus which can accurately obtain the propagation time of an ultrasonic wave and hence ensure a satisfactory measuring accuracy. SOLUTION: The ultrasonic flow velocity measuring apparatus for measuring the flow velocity of a fluid, utilizing an ultrasonic wave, comprises a flow velocity measuring unit 1 having linearly inclined inner surfaces from both sides in radially reducing directions at an inclination angle θ meeting the equation (1) tanθ>h/L, thereby avoiding causing a single-reflected ultrasonic wave (wherein θ is the reflection angle to an axial line passing ultrasonic transducers, (h) is the length of the ultrasonic transducer perpendicular to the axial line passing the transducers, and L is the distance between the ultrasonic transducers).

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