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51. 发明专利

JPH0915006A GAS FLOW METER 失效
公开(公告)号：JPH0915006A
公开(公告)日：1997-01-17
申请号：JP18334395
申请日：1995-06-26
申请人： TOHO GAS KK , TOKYO GAS CO LTD , OSAKA GAS CO LTD , YAMATAKE HONEYWELL CO LTD , TOYO GASMETER CO , AICHI TOKEI DENKI KK , KANSAI GASMETER KK , KIMMON MFG CO LTD , TAKENAKA SEISAKUSHO CO LTD
发明人： KIMURA YUKIO , SATO TAKAHITO , NUKUI KAZUMITSU , OKAMURA SHIGENORI , OISHI YASUHARU , HORI FUJIO , ITO TOSHIHIKO , NAMIMOTO MASANOBU , AOKI TOSHIAKI , IMAZAKI MASASHIGE , MATSUSHITA MASAHIKO
IPC分类号： G01F1/00 , G01F1/68 , G01F1/72 , G01F3/22 , G06F17/18
摘要： PURPOSE: To provide a gas flow meter of which measurement is not affected by the occurrence of pulsation of the flow of gas. CONSTITUTION: The gas flow meter comprises a flow sensor 28 that is attached to a gas pipeline and measures flow rate of a gas, a sampling program 25 that reads measurement values from the flow sensor 28 every specified first sampling time and converts them into digital values and a gas consumption amount calculation program 27 that calculates the consumption amount during a predetermined time period from the digital values read by the sampling program 25. It further comprises an average calculation program 26 that reads measurement values of the flow sensor 28 every second prescribed time in a prescribed measuring time at the first sampling time and converts them into digital values to calculate the average thereof.

52. 发明专利

JPH0914563A PRESSURE CHANGE ABSORBING DEVICE 失效
公开(公告)号：JPH0914563A
公开(公告)日：1997-01-17
申请号：JP18854695
申请日：1995-06-30
申请人： TOKYO GAS CO LTD , OSAKA GAS CO LTD , TOHO GAS KK , AICHI TOKEI DENKI KK , KIMMON MFG CO LTD , TAKENAKA SEISAKUSHO CO LTD , KANSAI GASMETER KK , TOYO GASMETER CO
发明人： NUKUI KAZUMITSU , KATO HIDEO , SAKAI KATSUTO , SATOU SOUBUN , SATO SHINICHI , OKAMURA SHIGENORI , OKADA SHUICHI , SATO TAKAHITO , KANDA KOICHI , AOKI TOSHIAKI , IMAZAKI MASASHIGE , YAMADA KAZUHIRO , NAMIMOTO MASANOBU , MIZUKOSHI YASUSHI
IPC分类号： F16L55/04
摘要： PURPOSE: To reduce a bad influence to up/down action of a float due to sticking of a mist in gas. CONSTITUTION: A float 220 is received in a case 210, to perform vertically moving in accordance with a differential pressure between the upstream and the downstream. When the differential pressure is a fixed value or less, the float 220 is not floated, to cut off a discharge port 212 of the case 210. By increasing the differential pressure, gas flows in from the upstream through an introducing port 211, to press up the float 220 and to flow out in the downstream by partly opening the discharge port 212. The discharge port 212 acts as a kind of throttle mechanism, absorbs fluctuation of pressure in the upstream, and suppresses transmission to the downstream. Since a sufficient space is provided between a peripheral surface of the float 220 and an internal peripheral surface of the case 210, even when here is stuck a considerable amount of mist in gas, a bad influence is prevented from being given to vertically moving the float 220. Since the float 220, while guided by three guiding protrusive parts 214 or the like, performs vertically moving, stable action without rolling can be performed.

53. 发明专利

JPH08297068A LEAK DETECTION APPARATUS FOR GAS PIPE 失效
公开(公告)号：JPH08297068A
公开(公告)日：1996-11-12
申请号：JP12602195
申请日：1995-04-26
申请人： TOKYO GAS CO LTD
发明人： NUKUI KAZUMITSU
IPC分类号： G01F1/00 , G01M3/26 , G08B21/00 , G08B21/16
摘要： PURPOSE: To obtain a leak detection apparatus by which a gas leak can be detected easily in a common pipe and in a plurality of individual pipes which are branched from the common pipe so as to supply a gas to respective users. CONSTITUTION: A leak inspection instruction part 24 at a processor 20 instructs respective user meters 141 to 14n to shut off respective shutoff valves, and it instructs a main meter 13 to send information on flow rate. At the respective user meters 141 to 14n , shutoff-valve control parts shutoff the shutoff valves, and, at the main meter 13, a communication and processing part transmits information on flow rate computed by a flow-rate computing part to the processor 20. When the flow rate detected by the main meter 13 exceeds an allowable error, a leak judgment part 22 at the processor 20 judges that a leak exists in a common pipe 11 reaching the user meters 141 to 14n from the main meter 13 and in individual pipes 121 , to 12n , and a warning is generated by a warning generation part 23.

54. 发明专利

JPH08261865A METHOD AND APPARATUS FOR LEAK INSPECTION OF GAS PIPE 失效
公开(公告)号：JPH08261865A
公开(公告)日：1996-10-11
申请号：JP9129695
申请日：1995-03-24
申请人： TOKYO GAS CO LTD
发明人： NUKUI KAZUMITSU , SHIKAMATA SHINICHI
IPC分类号： G01M3/00 , G01M3/26
摘要： PURPOSE: To enhance the detection sensitivity of gas leakage when a nail or the like is driven into a gas pipe. CONSTITUTION: A flow passage changeover valve 27 is set in such a way that a pipe 22 communicates with a pipe 26. In this state, a pump 22 is operated, and a pressure inside a gas pipe 10 is raised up to a prescribed pressure. The flow passage changeover valve 27 is changed over in such a way that a pipe 29 communicates with the pipe 26. While an average pressure inside the gas pipe 10 is held at the prescribed pressure, the pressure change which is generated by the pump 22 is given to the gas pipe 10. After that, the pump 22 is stopped, and the pressure inside the gas pipe 10 is monitored by a pressure gage 24. When the pressure is lowered, it is judged that gas leakage has been generated.

55. 发明专利

JPH08247398A PRESSURE FLUCTUATION ABSORBING DEVICE 失效
公开(公告)号：JPH08247398A
公开(公告)日：1996-09-27
申请号：JP7727695
申请日：1995-03-08
申请人： TOKYO GAS CO LTD , OSAKA GAS CO LTD , TOHO GAS KK , AICHI TOKEI DENKI KK , KIMMON MFG CO LTD , TAKENAKA SEISAKUSHO CO LTD , KANSAI GASMETER KK , TOYO GASMETER CO
发明人： NUKUI KAZUMITSU , KATO HIDEO , SAKAI KATSUTO , SATOU SOUFUMI , SATO SHINICHI , OKAMURA SHIGENORI , SATO TAKAHITO , SANNOMIYA SHIZUO , ISSHIKI HISASHI , IMAZAKI MASASHIGE , MATSUSHITA MASAHIKO , SHIBUYA TADAO , MIZUKOSHI YASUSHI
IPC分类号： F15D1/02 , F16L55/04 , F17D1/04
摘要： PURPOSE: To provide a pressure fluctuation absorbing device which can effectively absorb pressure fluctuation with pressure loss restrained low by a simple structure. CONSTITUTION: This pressure fluctuation absorbing device has a partition 24 for partitioning a main body 21 into two upper and lower air-chambers 22, 23; an introduction port 25; a discharge port 26; a cylindrical body 27 which is arrangedly provided in the air-chamber 22 with its axis directed in a perpendicular direction and fixed to the upper face of the partition 24 at its lower end; and a float 28 arranged inside the cylindrical body 27. A gas introducing opening 29 is provided in the partition 24 for the bottom of the cylindrical body 27, and the upper side of the cylindrical body 27 is closed by an upper wall 30. A throttle opening 31 functioning as a variable throttle is provided on the side wall of the cylindrical body 27, and a small gas circulating hole 32 is provided on the upper wall 30. A cushioning mechanism for controlling the abrupt movement of the float 28 is composed of the air-chamber formed of the side wall and upper wall 30 of the cylindrical body 27 and the upper face of the float 28, and the small hole 32.

56. 发明专利

JPH08240453A GAS LEAKAGE DETECTING DEVICE 失效
公开(公告)号：JPH08240453A
公开(公告)日：1996-09-17
申请号：JP6705395
申请日：1995-03-01
申请人： TOKYO GAS CO LTD
发明人： NUKUI KAZUMITSU , KATO HIDEO , SAKAI KATSUTO , SATOU SOUBUN , SATO SHINICHI
IPC分类号： G01F1/00 , G01M3/28 , G08B21/00 , G08B21/16
摘要： PURPOSE: To provide a gas leakage detecting device which can extremely speedily and easily detect gas leakage and can detect even abnormality such as accumulation of foreign matters in a pipe. CONSTITUTION: The gas leakage detecting device 11 detects transfer to OFF from ON of a hot water supply unit 14 being a specified gas apparatus to be a reference, and finds a pressure variation in a supply inner pipe 13 before and after its change. This pressure variation is compared with a reference differential pressure (a pressure variation at transfer time to OFF from ON of the hot water supply unit 14 when gas leakage is not caused) beforehand found by an experiment or the like, and the existence of gas leakage and its degree in the supply inner pipe 13 on the upstream side from the gas leakage detecting device 11 are judged and displayed. When a small gas leakage place 16 exists in the supply inner pipe 13, the pressure variation in the supply inner pipe 13 when the hot water supply unit 14 is put in an OFF condition from ON becomes larger than the reference differential pressure, and when the gas leakage quantity becomes further larger, its pressure variation becomes further larger.

57. 发明专利

JPH08226559A METER COCK 失效
公开(公告)号：JPH08226559A
公开(公告)日：1996-09-03
申请号：JP5672395
申请日：1995-02-21
申请人： TOKYO GAS CO LTD
发明人： NUKUI KAZUMITSU , SATO SHINICHI , SAITO MORIO
IPC分类号： F16K5/06 , F16K17/34
摘要： PURPOSE: To automatically and speedily cut out flowing of gas at the time when an abnormally large flow rate of gas flows. CONSTITUTION: Gas flows between the inside of a gas pipe 10a and the outside of a guide member 22, passes a slit 25 and flows in a gas pipe 10 on the downstream side of a meter cock through a passage 13. In this state, when an abnormally large flow larger than specified quantity, for example, 15m /h, flows velocity of gas passing the slit 25 becomes higher, suction force is generated between the passage 13 and a fuse ball 21 by flow of gas, the fuse ball 21 is sucked up by this suction force, the fuse ball 21 is adhered closely to an inlet part of the passage 13, and consequently, the passage 13 is closed and flowing of gas is cut out.

58. 发明专利

JPH08219928A METHOD FOR DETECTING POINT VOLUME OF GAS LEAKED FROM GAS DUCT 失效
公开(公告)号：JPH08219928A
公开(公告)日：1996-08-30
申请号：JP2977095
申请日：1995-02-17
申请人： TOKYO GAS CO LTD
发明人： NUKUI KAZUMITSU , SAKAI KATSUTO , KATO HIDEO , SATOU SOUFUMI , SATO SHINICHI
IPC分类号： G01M3/00 , G01M3/28
摘要： PURPOSE: To obtain a method for detecting the gas leak point and the volume. of leaked gas in a gas duct, e.g. the service pipe of city gas. CONSTITUTION: In the method for detecting leakage of gas from a duct 2 coupling between a main or branch pipe 1 and a gas meter 3, the gas meter 3 is provided with a pressure sensor 5. At some moment of time, pressure difference is measured by means of the gas meter 3 between a case where no gas flows through the duct 2 and three cases where gas flows through the duct at different flow rate. Assuming the pressure losses and the volumes of leaked gas at the duct part between the main or branch pipe 1 and a leak point L and at the duct part between the leak point L and the gas meter 3 at some flow rate are unknowns, simultaneous equations of three elements comprising equations of the differential pressures for three flow rates and the measured differential pressures are solved thus determining the gas leak point and the volume of leaked gas. Since the gas leak point and the volume of leaked gas can be detected for the duct between the gas meter 3 and the main or branch pipe 1 without digging the ground surface, manpower can be reduced.

59. 发明专利

JPH08219839A OUTPUT CORRECTING DEVICE OF FLOW VELOCITY SENSOR AND FLOW METER 失效
公开(公告)号：JPH08219839A
公开(公告)日：1996-08-30
申请号：JP4919295
申请日：1995-02-14
申请人： TOKYO GAS CO LTD , YAMATAKE HONEYWELL CO LTD
发明人： NUKUI KAZUMITSU , SAKAI KATSUTO , SATO SHINICHI , OISHI YASUHARU
IPC分类号： G01P5/12 , G01F1/00 , G01F1/68 , G01F1/696 , G01F15/04 , G01F25/00
摘要： PURPOSE: To reduce influence of fluctuation of a flow velocity due to pressure fluctuation or the like without causing any error in the computed flow. CONSTITUTION: An average value computing part 51 measures flow sensor output which is the output of an A/D converter 41 for A/D converting an output signal of a flow sensor 30, and computes the average value of flow sensor output to be outputted to a correcting part 53. A dispersion decision part 52 measures the flow sensor output which is the output of the A/D converter 41 for a fixed time, obtains a difference between the maximum value and the minimum value of the flow sensor output as dispersion of the flow sensor output, and determines a correction value according to the dispersion. The correcting part 53 multiplies the average value obtained by the average value computing part 51 by a correction value determined by the dispersion decision part 52 and outputs the same to a flow computing part 54. The flow computing part 54 computes a flow and an integrating flow according to the output of the correcting part 53.

60. 发明专利

JPH08210894A GAS METER 失效
公开(公告)号：JPH08210894A
公开(公告)日：1996-08-20
申请号：JP4230095
申请日：1995-02-07
申请人： TOKYO GAS CO LTD
发明人： NUKUI KAZUMITSU , KATO HIDEO , SAKAI KATSUTO , SATOU SOUBUN , SATO SHINICHI
IPC分类号： G01F3/22 , G01F1/28 , G01F1/40
摘要： PURPOSE: To reduce the size of a gas meter. CONSTITUTION: A gas sensor is provided with a main valve 21 for covering an opening 14 in the flow passage of a gas, hole 24 provided in the valve 21, cutoff valve 20 having an auxiliary valve 26 which can close the hole 24, and small differential pressure sensor which detects the differential pressure between the upstream side and downstream side of the valve 20 and calculates the flow rate of the gas based on the output of the sensor. In a small flow rate region, the flow rate measuring accuracy is improved by increasing the pressure loss by causing the main valve 21 to cover the opening 14 and the auxiliary valve 26 to open the hole 24. In a large flow rate region, insufficient supply of the gas is prevented by decreasing the pressure loss by causing the main valve 21 to open the opening 14.

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