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11. 发明专利

JP2010261746A Gas shut-off device 有权
标题翻译：气体切断装置
公开(公告)号：JP2010261746A
公开(公告)日：2010-11-18
申请号：JP2009110902
申请日：2009-04-30
申请人： Osaka Gas Co Ltd , Panasonic Corp , Toho Gas Co Ltd , Tokyo Gas Co Ltd , Toyo Gas Meter Kk , Yazaki Corp , パナソニック株式会社 , 大阪瓦斯株式会社 , 東京瓦斯株式会社 , 東洋ガスメーター株式会社 , 東邦瓦斯株式会社 , 矢崎総業株式会社
发明人： UEKI KOICHI , OTANI TAKAHISA , NAKABAYASHI YUJI , ASANO KAZUTAKA , KOBAYASHI MASATOMO , WATANABE AKIRA , KONO SACHIKO , YUASA KENICHIRO , NAGAI NOZOMI , ISHIKAWA TETSUO , KAWAGUCHI KEIJI , FUJII YASUHIRO , ISHIDA HIROSHI , SAKANO TAKAHIRO , YAMAURA MICHIAKI , ISOBE KIMIKATSU , HORI FUJIO , SHIMIZU HIROSHI
IPC分类号： G01F1/66 , G01F3/22 , G01N27/02
摘要： PROBLEM TO BE SOLVED: To provide a gas shut-off device capable of shutting off a gas by detecting infiltration of water, or the like, into a flow channel or a control part in the device.
SOLUTION: The gas shut-off device includes an amplification degree determining means 18 for determining a signal amplification degree of a flow rate detection means 8 performing flow rate detection with propagation velocity of an ultrasonic wave between vibrators 6, 7 disposed along the flow channel 4; a propagation time determination means 20 for determining the propagation time; a measurement condition setting means 16 changing a measurement condition; a flow channel inside abnormality determination means 22 for estimating water intrusion in the flow channel, when an abnormally short propagation time is detected at the amplification degree equal to or less than a lower limit determination value; a clocking means 23, activated when the amplification degree of an upper limit determination value or more is determined; a measurement ratio calculation means 24 for obtaining a ratio set at the maximum measurement condition during the clocking; an impedance estimation means 25 for estimating the abnormality of impedance between terminals of the flow rate detection means 8, when it is determined that the amplification degree is equal to or more than the upper limit determination value and the measurement ratio is equal to or more than a prescribed value; and a shut-off means 27 for shutting off the supply of gas at abnormality.
COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供一种能够通过检测水等的渗透而关闭气体的气体切断装置到装置中的流路或控制部中。气体切断装置包括：放大度判定装置18，用于确定流量检测装置8的信号放大度，该流量检测装置8执行流速检测，其传播速度是沿着沿着该方向设置的振动器6,7之间的超声波流路4; 用于确定传播时间的传播时间确定装置20; 改变测量条件的测量条件设置装置16; 当以等于或小于下限确定值的放大度检测到异常较短的传播时间时，用于估计流道中的水侵入的异常确定装置22内的流路; 当确定上限确定值或更多的放大度时激活的计时装置23; 用于获得在计时期间在最大测量条件下设定的比率的测量比率计算装置24; 用于估计流量检测装置8的端子之间的阻抗的异常的阻抗估计装置25，当确定放大度等于或大于上限确定值并且测量比等于或大于规定值以及用于在异常情况下关闭气体供应的切断装置27。版权所有（C）2011，JPO＆INPIT

12. 发明专利

JP2005106726A Gas meter 有权
标题翻译：气体计
公开(公告)号：JP2005106726A
公开(公告)日：2005-04-21
申请号：JP2003343124
申请日：2003-10-01
申请人： Osaka Gas Co Ltd , Toho Gas Co Ltd , Tokyo Gas Co Ltd , Toyo Gas Meter Kk , 大阪瓦斯株式会社 , 東京瓦斯株式会社 , 東洋ガスメーター株式会社 , 東邦瓦斯株式会社
发明人： MIZUKOSHI JIRO , HORI FUJIO , YOSHINO KAZUHIRO , FUJIMOTO TATSUO , SUZUKI MAMORU , YUASA KENICHIRO , INOUE TOMIO , FUJII YASUHIRO , HIROYAMA TORU
IPC分类号： G01F3/22 , G01F1/66
摘要： PROBLEM TO BE SOLVED: To provide a gas meter which assures precision of a cross section area of a path of a flow channel to be measured in which a fluid flows, and precision of a flow rate of the fluid measured by an ultrasonic flow measuring means, with reduced cost.
SOLUTION: In the gas meter, a pair of ultrasonic transmit-receive means are located to face each other in a flow channel to be measured. The flow channel to be measured comprises a body case, and a straight measuring tube for flow rate measurement stored in the body case. The measuring tube is connected using two L-shape members (52a and 52b) whose cross section in the vertical direction against the flow direction is L-shaped so as to make the cross section of the tube is rectangular. At the position where the ultrasonic transmit-receive means is located, an opening (52c) is provided. In addition, a turbulent flow suppression member (54) which has micropore to pass through ultrasonic waves is provided at the opening. The measuring tube also comprises a member whose coefficient of linear expansion is not greater than a prescribed value.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种气体计，其确保流体流动的待测量流路的路径的截面积的精度，以及通过超声波测量的流体的流量的精度流量测量装置，成本降低。解决方案：在气量计中，一对超声波发射 - 接收装置被定位成在要测量的流动通道中彼此相对。要测量的流动通道包括主体壳体和存储在主体壳体中的用于流量测量的直的测量管。测量管使用两个L形构件（52a和52b）连接，其横截面沿垂直方向相对于流动方向为L形，以使管的横截面为矩形。在超声波发送接收装置所在的位置，设置有开口（52c）。此外，在开口处设置有具有通过超声波的微孔的湍流抑制构件（54）。测量管还包括线膨胀系数不大于规定值的构件。版权所有（C）2005，JPO＆NCIPI

13. 发明专利

JP2006064626A Flow rate measuring apparatus 审中-公开
标题翻译：流量测量装置
公开(公告)号：JP2006064626A
公开(公告)日：2006-03-09
申请号：JP2004249851
申请日：2004-08-30
申请人： Osaka Gas Co Ltd , Toho Gas Co Ltd , Tokyo Gas Co Ltd , Toyo Gas Meter Kk , 大阪瓦斯株式会社 , 東京瓦斯株式会社 , 東洋ガスメーター株式会社 , 東邦瓦斯株式会社
发明人： MIZUKOSHI JIRO , HORI FUJIO , FUJIMOTO TATSUO , SUZUKI MAMORU , YUASA KENICHIRO , FUJII YASUHIRO , KIMURA YUKIO , HIROYAMA TORU
IPC分类号： G01F1/66 , G01F3/22
摘要： PROBLEM TO BE SOLVED: To provide a flow rate measuring apparatus improving measurement accuracy by almost equalizing flow rate coefficients even in the case of measuring different fluid to be measured.
SOLUTION: The flow rate measuring apparatus 1 has: a main body case 10; a flow path 50 for letting fluid flow; a pair of ultrasonic transmission means 51c, 51c for transmitting ultrasonic wave between specific 2 points at upstream side and downstream side in the flow path 50; a flow rate operation means calculating the flow rate value of the fluid from the velocity of the fluid measured with the ultrasonic transmission means 51c, 51c and a cross-sectional area perpendicular to the flow direction of the fluid; and a plurality of branch flow paths 50a which never disturb transmission of ultrasonic wave and the flow of fluid in a region containing the transmission path of the ultrasonic wave in at least the flow path 50. The branch flow paths 50a are formed in the flow paths 50 to be equal in the range of 1.5 to 1.7 mm by 5 straightening plates 53.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供一种流量测量装置，即使在测量不同待测量流体的情况下，通过使流量系数几乎相等来提高测量精度。流量测量装置1具有：主体壳体10; 用于使流体流动的流路50; 用于在流路50的上游侧和下游侧的特定2点之间传输超声波的一对超声波发送单元51c，51c; 流量操作装置根据与超声波传送装置51c，51c测量的流体的速度和垂直于流体的流动方向的横截面来计算流体的流量值; 以及多个分支流路50a，其至少在流路50中不会妨碍超声波的发送和包含超声波的传输路径的区域中的流体的流动。分支流路50a形成在流路 50通过5个矫直板53在1.5至1.7mm的范围内相等。版权所有（C）2006，JPO＆NCIPI

14. 发明专利

JP2006017499A Gas meter 有权
标题翻译：气体计
公开(公告)号：JP2006017499A
公开(公告)日：2006-01-19
申请号：JP2004193467
申请日：2004-06-30
申请人： Osaka Gas Co Ltd , Toho Gas Co Ltd , Tokyo Gas Co Ltd , Toyo Gas Meter Kk , 大阪瓦斯株式会社 , 東京瓦斯株式会社 , 東洋ガスメーター株式会社 , 東邦瓦斯株式会社
发明人： MIZUKOSHI JIRO , HORI FUJIO , YANO MITSUNORI , FUJIMOTO TATSUO , SUZUKI MAMORU , YUASA KENICHIRO , FUJII YASUHIRO , KIMURA YUKIO , HIROYAMA TORU
IPC分类号： G01F3/22 , G01F1/66
摘要： PROBLEM TO BE SOLVED: To curtail labor for assembling a gas meter by simultaneously assembling inflow suppressing members (turbulence suppressing members) in assembling work.
SOLUTION: Propagation window parts 41 and 52 for causing ultrasonic wave to pass therethrough are formed in confronting sides of first and second measurement passage members 40 and 50. The turbulence suppressing members 60 are attached to the window parts 41 and 52 for preventing gas from flowing out of the window parts 41 and 52 to the exterior by covering the window parts 41 and 52 from the interior side of a measurement passage 30. On the suppressing members 60, fixation parts 61 are formed which are disposed at positions corresponding to points at which the passage members 40 and 50 contact with each other. On contacting point parts of the passage members 40 and 50, assembling means 80 and 90 are formed respectively for assembling the two. The fixation parts 61 of the suppressing members 60 are fixed to the contact points by using the assembling means 80 and 90.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：通过在组装工作中同时组装流入抑制构件（湍流抑制构件）来减少组装燃气表的人力。解决方案：在第一和第二测量通道构件40和50的相对侧形成有用于使超声波通过的传播窗部分41,42。湍流抑制构件60附接到窗口部分41和52以防止通过从测量通道30的内侧覆盖窗部41和52，从窗部41和52流出的气体到达外部。在抑制构件60上，形成有固定部61，通道构件40和50彼此接触的点。在通道构件40和50的接触点部分上分别形成组装装置80和90以组装两者。抑制构件60的固定部61通过使用组装装置80和90固定到接触点。版权所有：（C）2006，JPO＆NCIPI

15. 发明专利

JP2005345187A Gas meter 有权
标题翻译：气体计
公开(公告)号：JP2005345187A
公开(公告)日：2005-12-15
申请号：JP2004163135
申请日：2004-06-01
申请人： Osaka Gas Co Ltd , Toho Gas Co Ltd , Tokyo Gas Co Ltd , Toyo Gas Meter Kk , 大阪瓦斯株式会社 , 東京瓦斯株式会社 , 東洋ガスメーター株式会社 , 東邦瓦斯株式会社
发明人： MIZUKOSHI JIRO , HORI FUJIO , YANO MITSUNORI , FUJIMOTO TATSUO , SUZUKI MAMORU , YUASA KENICHIRO , INOUE TOMIO , FUJII YASUHIRO , KIMURA YUKIO , HIROYAMA TORU
IPC分类号： G01F3/22 , G01F15/14
摘要： PROBLEM TO BE SOLVED: To provide a gas meter provided with a communication terminal and a terminal cover for covering the communication terminal, capable of preventing the removed terminal cover from being damaged, lost or like, when removing the terminal cover, and capable of enhancing workability of work using the communication terminal. SOLUTION: This gas meter 1 provided with the communication terminal 20 communicated with a separate communication equipment via a communication line, and the removable terminal cover 1e for covering the communication terminal 20 is provided with a coming-off preventive means 30 for preventing the terminal cover 1e from coming off out of the gas meter 1. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供一种设置有通信终端的气量计和用于覆盖通信终端的终端盖，能够防止移除的终端盖在移除终端盖时被损坏，丢失或类似，以及能够提高使用通信终端的工作性。
解决方案：设置有通信终端20的气量计1经由通信线与单独的通信设备通信，并且用于覆盖通信终端20的可移除终端盖1e设置有防止装置30，用于防止终端盖1e从燃气表1中脱出。版权所有（C）2006，JPO＆NCIPI

16. 发明专利

JP2004333202A Gas meter 审中-公开
公开(公告)号：JP2004333202A
公开(公告)日：2004-11-25
申请号：JP2003126513
申请日：2003-05-01
申请人： Osaka Gas Co Ltd , Toho Gas Co Ltd , Tokyo Gas Co Ltd , Toyo Gas Meter Kk , 大阪瓦斯株式会社 , 東京瓦斯株式会社 , 東洋ガスメーター株式会社 , 東邦瓦斯株式会社
发明人： MIZUKOSHI JIRO , HORI FUJIO , YOSHINO KAZUHIRO , FUJIMOTO TATSUO , SUZUKI MAMORU , YUASA KENICHIRO , INOUE TOMIO , FUJII YASUHIRO , HIROYAMA TORU
IPC分类号： G01F1/00 , G01F1/66 , G01F3/22
摘要： PROBLEM TO BE SOLVED: To provide a gas meter capable of acquiring stable and accurate measurement through the use of an ultrasonic flow measuring means.
SOLUTION: The gas meter is provided with a source inflow opening 1a in which gas flows, a facility outflow opening 1b out of which the gas flows, and the measuring means 50 provided between the source inflow opening 1a and the facility outflow opening 1b. A rectifying member for rectifying the flow of the gas is provided at at least either a measuring inflow opening 50a corresponding to an entrance of the measuring means, or a measuring outflow opening 50b corresponding to an exit of the measuring means. In the gas meter; a first channel forming member 40, the measuring means, and a second channel forming member 48 are constituted in an approximately U-shape. The measuring inflow opening is protruded. An inflow-side turbulence suppressing member 42 is provided above the measuring inflow opening at a first prescribed distance. The rectifying member is constituted in such a way that the gas, which reaches the measuring inflow opening through the first channel forming member, may turn around the inflow-side turbulence suppressing member 42 and the protruded measuring inflow opening and reach the measuring inflow opening. The gas meter is provided with a flange part F outside at least either the measuring inflow opening or the measuring outflow opening.
COPYRIGHT: (C)2005,JPO&NCIPI

17. 发明专利

JP2003075226A Gas meter 有权
标题翻译：气体计
公开(公告)号：JP2003075226A
公开(公告)日：2003-03-12
申请号：JP2001263855
申请日：2001-08-31
申请人： Osaka Gas Co Ltd , Toho Gas Co Ltd , Toyo Gas Meter Kk , 大阪瓦斯株式会社 , 東洋ガスメーター株式会社 , 東邦瓦斯株式会社
发明人： MATSUSHITA HIROSHI , MINAMI TADAYUKI , FUJII YASUHIRO , TAGAWA SHIGERU , KIMURA YUKIO , HIROYAMA TORU , MIZUKOSHI JIRO , HORI FUJIO , MORII NOBUYOSHI , NAKAMURA NOBUHIRO
IPC分类号： G01F3/22 , G01F1/00 , G01F1/66
摘要： PROBLEM TO BE SOLVED: To provide a gas meter which reduces a power consumption used to drive an adjusting means by a method wherein the position (the opening amount) of a valve is controlled properly according to the used amount of gas.
SOLUTION: The gas meter is provided with a main flow channel in which the adjusting means used to adjust the opening amount of a flow channel is installed, a subflow channel which bypasses the adjusting means in the main flow channel, a flow-rate detection means and a control means which controls opening/closing of the adjusting means on the basis of a corrected flow-rate value obtained by correcting and processing the detected flow-rate value of the flow-rate detection means. The control means controls the adjusting means to the position of a first opening between a fully closed position and a fully opened position when the corrected flow-rate value becomes a first prescribed flow-rate value or more, and it controls the adjusting means to the fully opened position when the corrected flow-rate value becomes a second prescribed flow- rate value or more higher than the first prescribed flow-rate value when the adjusting means is in the position of the first opening.
COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：提供一种气量计，其通过根据所使用的气体量适当地控制阀的位置（开口量）的方法来降低用于驱动调节装置的功率消耗。解决方案：气量计设有主流道，其中安装用于调节流道开口量的调节装置，旁通主流道中的调节装置的子流通道，流量检测装置以及控制装置，其基于通过校正和处理检测到的流量检测装置的流量值获得的校正流量值来控制调节装置的打开/关闭。当校正流量值变为第一规定流量值以上时，控制装置将调节装置控制在完全关闭位置和完全打开位置之间的第一开口的位置，并且将调节装置控制到当调节装置处于第一开口的位置时，当校正流量值变为第二规定流量值或更高于第一规定流量值时，完全打开位置。

18. 发明专利

JP2003075210A Gas leak detector and gas meter 有权
标题翻译：气体泄漏探测器和气体计
公开(公告)号：JP2003075210A
公开(公告)日：2003-03-12
申请号：JP2001263854
申请日：2001-08-31
申请人： Osaka Gas Co Ltd , Toho Gas Co Ltd , Toyo Gas Meter Kk , 大阪瓦斯株式会社 , 東洋ガスメーター株式会社 , 東邦瓦斯株式会社
发明人： MATSUSHITA HIROSHI , MINAMI TADAYUKI , FUJII YASUHIRO , TAGAWA SHIGERU , KIMURA YUKIO , HIROYAMA TORU , MIZUKOSHI JIRO , HORI FUJIO , MORII NOBUYOSHI , NAKAMURA NOBUHIRO
IPC分类号： G01F1/00 , F17D5/06 , G01F1/66 , G01F3/22 , G01M3/00
摘要： PROBLEM TO BE SOLVED: To provide a gas leak detector or a gas meter which reduces the driving number of times of an adjusting means to reduce the current consumption of a battery for driving the adjusting means and reliably detects even a small rate of gas leakage.
SOLUTION: The gas leak detector or the gas meter having this detector comprises a main passage having a means for adjusting the opening of the passage, a subpassage having a flow rate detecting means, and a failure detecting means. The subpassage bypasses the main passage. The failure detecting means controls to fully close the adjusting means in the event of a failure detected, and the adjusting means detects the gas leak failure, based on a measured value by the flow rate detecting means with the adjusting means fully closed. The detecting means acts for detecting the failure every first specified time. If the detected flow rate based on the measured value by the flow rate detecting means with the adjusting means fully closed in the event of the failure exceeds a first specified flow rate continuously for over a second specified time, it detects the gas leak failure.
COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：提供一种减少调节装置的驱动次数的气体泄漏检测器或气量计，以减少用于驱动调节装置的电池的电流消耗，并可靠地检测甚至较小的气体泄漏率。解决方案：具有该检测器的气体泄漏检测器或气量计包括具有用于调节通道开口的装置的主通道，具有流量检测装置的次通道以及故障检测装置。次通过绕过主要通道。故障检测装置控制在检测到故障的情况下完全关闭调节装置，并且调节装置基于通过调节装置完全关闭的流量检测装置的测量值来检测气体泄漏故障。检测装置用于每第一指定时间检测故障。如果在发生故障的情况下通过调节装置完全关闭的流量检测装置的检测到的流量超过第一指定流量超过第二指定时间，则检测到气体泄漏故障。

19. 发明专利

JP2003075227A Gas meter 有权
标题翻译：气体计
公开(公告)号：JP2003075227A
公开(公告)日：2003-03-12
申请号：JP2001263856
申请日：2001-08-31
申请人： Osaka Gas Co Ltd , Toho Gas Co Ltd , Toyo Gas Meter Kk , 大阪瓦斯株式会社 , 東洋ガスメーター株式会社 , 東邦瓦斯株式会社
发明人： MATSUSHITA HIROSHI , MINAMI TADAYUKI , FUJII YASUHIRO , TAGAWA SHIGERU , KIMURA YUKIO , HIROYAMA TORU , MIZUKOSHI JIRO , HORI FUJIO , MORII NOBUYOSHI , NAKAMURA NOBUHIRO
IPC分类号： G01F3/22 , G01F1/00 , G01F7/00
摘要： PROBLEM TO BE SOLVED: To provide a gas meter which can reduce a power consumption used to drive an adjusting means by a method wherein the output voltage of a battery is estimated indirectly even in the battery incapable of detecting the output voltage directly, and the adjusting means is controlled optimally by a control characteristic based on the estimated output voltage.
SOLUTION: The gas meter is provided with a main flow channel in which the adjusting means used to adjust the opening amount of a flow channel is installed, a subflow channel which bypasses the adjusting means in the main flow channel, a flow-rate detection means, a control means which controls opening/closing of the adjusting means on the basis of a corrected flow-rate value obtained by correcting and processing the detected flow-rate value of the flow-rate detection means and a power supply. The control means estimates a temperature on the basis of a detection value detected by the flow-rate detection means, it estimates the output voltage of the power supply on the basis of the cumulative operation amount of the adjusting means, and it controls the adjusting means optimally on the basis of the estimated output voltage so as to reduce the power consumption.
COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：提供一种能够减少用于驱动调节装置的功率消耗的燃气表，其中即使在不能直接检测输出电压的电池中间接地估计电池的输出电压，并且调节通过基于估计的输出电压的控制特性来最佳地控制装置。解决方案：气量计设有主流道，其中安装用于调节流道开口量的调节装置，旁通主流道中的调节装置的子流通道，流量检测装置基于通过校正和处理检测到的流量检测装置的流量值而获得的校正流量值和电源来控制调节装置的打开/关闭的控制装置。控制装置基于由流量检测装置检测的检测值来估计温度，其基于调整装置的累积操作量来估计电源的输出电压，并且控制调节装置最佳地基于估计的输出电压来降低功耗。

20. 发明专利

JP2013205250A Gas shut-off device 有权
标题翻译：气体切断装置
公开(公告)号：JP2013205250A
公开(公告)日：2013-10-07
申请号：JP2012075078
申请日：2012-03-28
申请人： Panasonic Corp , パナソニック株式会社 , Tokyo Gas Co Ltd , 東京瓦斯株式会社 , Osaka Gas Co Ltd , 大阪瓦斯株式会社 , Toho Gas Co Ltd , 東邦瓦斯株式会社
发明人： UEKI KOICHI , IWAMOTO RYUJI , ASANO KAZUTAKA , NAKABAYASHI YUJI , SAKUMA HIROHISA , YUASA KENICHIRO , OWAKU TAKASHI , ASADA SHOJI , FUJII YASUHIRO , MASUDA TAKEHIRO , ISHIDA HIROSHI , SAKANO TAKAHIRO
IPC分类号： G01F3/22 , F23K5/00 , G01F1/66
摘要： PROBLEM TO BE SOLVED: To prevent erroneous shut-off caused by measurement abnormality monitoring in ultrasonic flowmeter measurement.SOLUTION: A gas shut-off device comprises an upstream-side transceiver 16 and a downstream-side transceiver 17 which are disposed along a flow of a flow passage, transmission means for driving the transceivers 16, 17, switching means 18 for switching transmission/reception of the transceivers 16, 17, receiving means 20 for receiving ultrasonic waves, signal detection control means 22 for controlling detection start of a receiving signal, amplitude determination means 23 which determines an amplitude is equal to or more than a predetermined ultrasonic signal level, propagation time measuring means 24 which measures a time from driving start in the transmission means 19 to signal detection in the amplitude determination means 23, flow computing means 25 which computes an instantaneous flow value from a measurement of the propagation time measuring means 24, flow change determination means 26 which determines the presence/absence of flow fluctuation equal to or more than a predetermined value from the flow computed by the flow computing means 25, and signal detection computing means 27 which computes the time to make earlier the signal detection start in the signal detection control means 22 when the change equal to or more than the predetermined flow is detected by the flow change determination means 26.
摘要翻译：要解决的问题：为了防止超声波流量计测量中的测量异常监测引起的错误切断。解决方案：一种气体切断装置，包括上游侧收发器16和下游侧收发器17，流路，用于驱动收发器16,17的发送装置，用于切换收发机16,17的发送/接收的切换装置18，用于接收超声波的接收装置20，用于控制接收信号的检测开始的信号检测控制装置22 确定振幅的幅度确定装置23等于或大于预定超声波信号电平;传播时间测量装置24，其测量从发送装置19中的开始启动到振幅确定装置23中的信号检测的时间;流量计算装置25，其计算来自传播时间测量装置24的测量值的瞬时流量值，流量变化确定装置26，其根据流量计算装置25计算的流量确定等于或大于预定值的流量波动的存在/不存在;以及信号检测计算装置27，其计算使信号检测开始更早的时间当由流量变化确定装置26检测到等于或大于预定流量的变化时，在信号检测控制装置22中。

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