CN101084399A - Gas block device and gas block method - Google Patents

Abstract

A use condition of gas equipment is monitored. An abnormality determination unit 26 determines whether or not a use flow volume obtained by detecting a flow velocity obtained by measuring a signal transfer time in a medium using a flow velocity detection unit 17 and converting the detected flow velocity into a flow volume using a flow volume calculation unit 25. When the shutoff unit 27 shuts off a fluid path 1 when it is determined that there is abnormality, a return signal is output from a return unit 28 to a shutoff unit 27 in order to use the gas again by opening the fluid path. Simultaneously, when a return time-counting unit 29 starts the time-counting operation, and then, a predetermined time period has been elapsed, the flow volume calculation unit 25 determines whether or not a predetermined flow volume of greater flows in order to identify whether or not all of the gas plugs of the gas equipment connected to the downstream of the gas shutoff apparatus 27 are closed. The leakage determination unit 30 determines that there is leakage when a predetermined flow volume or greater is detected, and a driving signal is output to the shutoff unit 27 to close the fluid path 1.

Description

Fuel gas shutoff device and fuel gas shutoff method

[technical field]

The present invention relates to a kind of fuel gas shutoff device and a kind of fuel gas shutoff method, be used to use ultrasound examination to flow through the flow of the various media of pipeline, described medium comprises for example gas such as town gas or liquefied petroleum (LP) gas, and is used for accurate measuring media consumption to monitor whether safety of its user mode.

[background technology]

Fig. 9 shows the conventional fuel gas shutoff device as the above-mentioned type that discloses at JP-A-56-160520 for example.

With reference to Fig. 9, Reference numeral 1 expression pipeline wherein will be used for cutting off or transmit the shutoff valve 3 that uses combustion gas at pipeline and be installed near the fuel gas supply source 2.Reference numeral 4 expression fuel gas buring utensils, for example gas burner wherein is equipped with utensil plug 5.Reference numeral 6 expression master controllers, it sends to shutoff valve with control signal.Reference numeral 7 expression pressure sensor component, it is installed in the downstream of shutoff valve 3.Reference numeral 8 notation implement plug ON/OFF detection parts, its on/off operation with utensil plug 5 is associated and exports utensil plug ON/OFF signal.The gaseous-pressure supervisory circuit is used in Reference numeral 9 expressions, and the residual gaseous-pressure testing circuit of Reference numeral 10 expressions.When detecting gaseous-pressure, detected gaseous-pressure is outputed to use gaseous-pressure testing circuit 9 and residual gaseous-pressure testing circuit 10 from utensil plug ON/OFF detection part 8 output utensil plug ON/OFF signals and by pressure sensor component 7.Reference numeral 11 expression memory circuits, its storage is from the gaseous-pressure signal that uses gaseous-pressure testing circuit 9 and residual gaseous-pressure testing circuit 10.Reference numeral 12 expression shutoff valve ON/OFF circuit, when pressure reduction signal is input to memory circuit 11 from using gaseous-pressure testing circuit 9 and residual gaseous-pressure testing circuit 10, it receives the reduction state, and output is blocked (blockage) signal to shutoff valve 3.Reference numeral 13 expression SRs, and Reference numeral 14 expression timing circuits.The safe reset circuit of Reference numeral 15 expressions, when the output signal that receives from memory circuit 11 and timing circuit 14, it will be transferred to memory circuit 11, timing circuit 12 and light buzz circuit 16 from the output signal of memory circuit 11 and timing circuit 12, thereby keep the inspection state.

Subsequently, will the operation of this routine example be described.When opening the utensil plug 5 of the fuel gas buring utensil 4 of gas burner for example, utensil plug ON/OFF signal outputs to from utensil plug ON/OFF detection part 8 and uses gaseous-pressure supervisory circuit 9 and residual gaseous-pressure testing circuit 10.In addition, the gaseous-pressure detection signal from pressure detecting part 7 is input to use gaseous-pressure supervisory circuit 9 and residual gaseous-pressure testing circuit 10.The gaseous-pressure detection signal and the utensil plug ON/OFF signal that use gaseous-pressure supervisory circuit 9 to have imported output to memory circuit 11.When opening the utensil plug based on these signals, combustion gas outputs to shutoff valve ON/OFF circuit 12.When situation downforce such as flexible pipe disconnection are reduced under the predetermined value suddenly, stop output.Output to memory circuit 11 to for example utensil plug ON/OFF signal of residual gaseous-pressure testing circuit 10 and the input signal of gaseous-pressure detection signal, to detect abnormality.On the other hand, output to each circuit from the output signal of utensil plug ON/OFF detection part 8, and when the utensil plug is closed, residual gaseous-pressure testing circuit 10 is set.When the utensil plug was closed, residual gaseous-pressure testing circuit 10 began to detect residual gaseous-pressure.In the time of under gaseous-pressure is reduced to particular value, memory circuit 11 and safe reset circuit 15 transmission signals are given shutoff valve ON/OFF circuit 12 and timing circuit 14, to start timer and shutoff valve 3 to be set to open mode.Whether subsequently, monitor residual gaseous-pressure once more is reduced under the particular value in the specific time limit of being set by timing circuit 14 (for example, 5～15 minutes).In the time of under gaseous-pressure eases down to particular value, transmit a signal to memory circuit 11, and by shutoff valve ON/OFF circuit 12 locking shutoff valves 3.When gaseous-pressure does not reduce, reset memory circuit 11.Memory circuit 11 storages reduce signal from the gaseous-pressure that uses gaseous-pressure supervisory circuit 9 or residual gaseous-pressure testing circuit 10, and it is outputed to shutoff valve ON/OFF circuit 12 to close shutoff valve 3.Simultaneously, output to light buzz circuit 16 by timing circuit 14 and safe reset circuit 15 from the signal that uses gaseous-pressure supervisory circuit 9, thus operation buzzer or alarm lamp.Under abnormal conditions, shutoff valve ON/OFF circuit 12 receives from the signal of memory circuit 11 stopping to the electrical transmission of shutoff valve 3, and wherein memory circuit 11 receives above-mentioned signal from residual gaseous-pressure testing circuit 10.Operation according to memory circuit 11, safe reset circuit 15 or SR 13 comes function timing circuit 14, and timing circuit 14 is transferred to light buzz circuit 16 and safe reset circuit 15 with its output.The output that safe reset circuit 15 receives from memory circuit 11 and timing circuit 14, and transmit signals to light buzz circuit 16, thus keep the inspection state.Notice that as a kind of identification safe method that resets, when operation SR 13, open shutoff valve 3, combustion gas is filled in the pipeline, and closes shutoff valve 3 subsequently.After that, monitor residual gaseous-pressure and in specific time limit (for example, about 5～15 minutes), whether reduce.During that, repeated open and close a lamp with prompting inspection state.In this case, when gaseous-pressure does not reduce, after finishing this inspection, can carry out normal running.When using gaseous-pressure to be reduced under the particular value, close shutoff valve 3, and repeated open and close a lamp or buzzing bell.In other words, owing to shutoff valve 3 is not opened, so can not use combustion gas.

[patent documentation 1] JP-A-56-160520

[summary of the invention]

Yet,, need operate SR and timing circuit, monitoring gaseous-pressure the long judgement time and whether be reduced under the particular value and judge whether have leakage in the section at a time according to above-mentioned conventional configurations.Therefore, spend long-time judgement whether having leakage during the reset operation or will spend long-time cut-out pipeline when judging to exist when leaking.

Design the present invention is to solve foregoing problems, and an object of the present invention is to provide a kind of fuel gas shutoff device, be used for when the work of fuel gas shutoff device also resets subsequently, carry out rapidly about whether having the gas leakage of combustion gas use to judge, thereby whether the user mode of monitoring Gas appliance safety, and described combustion gas for example is town gas and LP gas.

In addition, an object of the present invention is to provide a kind of fuel gas shutoff device, be used for when the fuel gas shutoff device is carried out rupturing operation and turned back to original state subsequently, carrying out about whether the gas leakage that the not firm locking owing to the original plug of utensil causes combustion gas constantly to be leaked rapidly and inevitably judges, thereby whether the user mode of monitoring Gas appliance safety, and described combustion gas for example is town gas and LP gas.

In order to achieve the above object, according to the present invention, the user mode of monitoring Gas appliance.The abnormality juding parts judge whether use traffic is normal, wherein detect the flow velocity and the use traffic calculating unit that obtain by signal transmission time in the measuring media flow velocity that is detected is converted to flow, obtain described use traffic by use traffic detection Returning part.By cutting off parts when cutting off flow path, reset signal outputs to the cut-out parts from reset components, thereby reuses combustion gas by opening flow path when judge existing unusual.Simultaneously, when pick up counting operation and when having passed through scheduled time slot subsequently of the timing piece that resets, the use traffic calculating unit judges whether to be predetermined amount of flow or bigger flow, thereby whether all combustion gas plugs of determining to be connected to the Gas appliance in fuel gas shutoff device downstream close.When judgement was predetermined amount of flow or bigger flow, the leak judgement parts determined to exist leakage, and the driving signal outputs to these cut-out parts to close flow path.

Therefore, even user mode at this Gas appliance of monitoring, detect unusual user mode, for example very a large amount of flows, the fuel gas shutoff device cuts off flow path, and this reset components drives and cuts off parts subsequently, to open flow path and to reuse after the combustion gas, can judge rapidly also whether this Gas appliance can reuse or whether combustion gas leaks.When gas leakage, can cut off combustion gas immediately.Also have, can judge accurately that whether existing leakage or Gas appliance whether to return to normally is provided with state.In addition, owing to can monitor user mode, under leak condition, can not spend long-time judgement to leak.Therefore, can prevent the leakage of unstripped gas at short notice.

According to the present invention, the user mode of monitoring Gas appliance.The abnormality juding parts judge whether use traffic is normal, wherein detect the flow velocity and the use traffic calculating unit that obtain by signal transmission time in the measuring media flow velocity that is detected is converted to flow, obtain described use traffic by use traffic detection Returning part.By cutting off parts when cutting off flow path, reset signal outputs to the cut-out parts from reset components, thereby reuses combustion gas by opening flow path when judge existing unusual.Simultaneously, when the timing piece that resets pick up counting operation, when having passed through scheduled time slot, and subsequently, use the pressure detecting part of the pressure in the test fluid pipeline, whether the pressure in the leak judgement parts signal piping is reduced to predetermined pressure or lower, thereby whether all combustion gas plugs of differentiating the Gas appliance that is connected to fuel gas shutoff device downstream close, and will drive signal and output to these cut-out parts to close flow path.

Therefore, even user mode at this Gas appliance of monitoring, detect unusual user mode, for example very a large amount of flows, the fuel gas shutoff device cuts off flow path, whether and this reset components drives and cuts off parts subsequently, to open flow path and to reuse after the combustion gas, also can reduce and judge rapidly whether this Gas appliance can reuse or whether combustion gas leaks by differentiating supply pressure.When gas leakage, can cut off combustion gas immediately.Also have, can judge accurately that whether existing leakage or Gas appliance whether to return to normally is provided with state.In addition, owing to can monitor user mode, under leak condition, can not spend long-time judgement to leak.Therefore, can prevent the leakage of unstripped gas at short notice.

As mentioned above, according to the present invention, Gas appliance detected unusually between the operating period after, whether the differentiation user forgets was closed the utensil plug or whether has leakage, cut off parts and closed flow path, and use reset components to recover to cut off parts subsequently.Because gas leakage after cut-out, so gaseous-pressure reduces.When carrying out reset operation, fill combustion gas the pipeline length from the fuel gas shutoff device to Gas appliance.Though the pipeline length that the time that is used to judge leakage is flow through according to fluid and difference is carried out leak judgement according to the flow that obtains from the flow rate detection parts, and can be not mistakenly will not be judged to be leakage when the flow of measuring during the filling combustion gas in the pipeline.Therefore, can judge at short notice and can reuse this Gas appliance.In addition, when cutting off owing to unusual big flow, aggregate flow or service time, wrong judgement was carried out in cut-out, can differentiate the removal of cutting off cause or original pipe close of not closed Gas appliance fully at short notice.Therefore, can improve convenience and security.

As mentioned above, according to the present invention, during Gas appliance, detect unusual after, differentiate the user and whether forget and closes the utensil plug or whether have leakage, cut off parts and close flow path, and use reset components to recover to cut off parts subsequently.Because gas leakage after cut-out, so gaseous-pressure reduces.When carrying out reset operation, fill combustion gas the pipeline length from the fuel gas shutoff device to Gas appliance.The pipeline length that the time that is used to judge leakage is flow through according to fluid and difference.In pipeline, be full of combustion gas, and all the utensil pipe closes in the downstream be close the time, supply pressure stabilizes to blockage pressure.On the other hand, when the user in the house differentiated unclear and opens stopper, supply pressure was reduced to controlled pressure from blockage pressure.Therefore, carry out leak judgement, and can not judge the flow of when pipeline is opened, measuring mistakenly based on the pressure that obtains from pressure detecting part.Therefore, can judge at short notice and can reuse this Gas appliance.In addition, when cutting off owing to unusual big flow, aggregate flow or service time, wrong judgement was carried out in cut-out, can differentiate the removal of cutting off cause or original pipe close of not closed Gas appliance fully at short notice.Therefore, can improve convenience and security.

[description of drawings]

[Fig. 1] Fig. 1 shows the control block diagram according to the fuel gas shutoff device of first embodiment of the invention.

[Fig. 2] Fig. 2 shows the control block diagram according to the fuel gas shutoff device of second embodiment of the invention.

[Fig. 3] Fig. 3 shows the control block diagram according to the fuel gas shutoff device of third embodiment of the invention.

[Fig. 4] Fig. 4 shows the control block diagram according to the fuel gas shutoff device of fourth embodiment of the invention.

[Fig. 5] Fig. 5 shows the control block diagram according to the fuel gas shutoff device of fifth embodiment of the invention.

[Fig. 6] Fig. 6 shows the control block diagram according to the fuel gas shutoff device of sixth embodiment of the invention.

[Fig. 7] Fig. 7 shows the control block diagram according to the fuel gas shutoff device of seventh embodiment of the invention.

[Fig. 8] Fig. 8 shows the control block diagram according to the fuel gas shutoff device of eighth embodiment of the invention.

[Fig. 9] Fig. 9 shows the control block diagram of conventional fuel gas shutoff device.

[specific embodiment]

According to the present invention, a kind of fuel gas shutoff device is provided, comprising: the flow rate detection parts are used for detecting flow velocity by the signal transmission time of measuring media; The flow rate calculation parts, the flow velocity that is used for being detected by the flow rate detection parts is converted to flow; The abnormality juding parts are used to judge whether the use traffic that is obtained by the flow rate calculation parts is normal; Cut off parts, be used for judging having when unusual the cut-out flow path when the abnormality juding parts; Reset components is used to export reset signal and gives the cut-out parts to open flow path; The timing piece that resets is used to use reset components to pick up counting; The leak judgement parts, when the flow that is used for being obtained by the flow rate calculation parts after it detects the timing piece that resetting to determine the process scheduled time slot was equal to or greater than predetermined amount of flow, output drive signal was given and is cut off parts to cut off flow path.

Cut off when reusing Gas appliance after the flow path by cutting off parts when the unusual user mode that detects Gas appliance at the abnormality detection parts, reset components drives the cut-out parts and opens flow path.Yet the combustion gas in pipeline is leaked, and the gaseous-pressure reduction, has closed the utensil plug after cutting off.When carrying out this reset operation, and subsequently, combustion gas fills in the pipeline, and a large amount of flows begins to flow, and flow reduces after pipeline is full of combustion gas.Therebetween, when the timing piece that resets carries out timing, can postpone based on leak judgement by flow rate detection flow that parts detect.Therefore, do not have owing to forgetting that closing stopper causes the mistake of leaking to be judged, at that after, become when stablizing when flow, can judge rapidly according to the flow of measurement whether Gas appliance is available.Therefore, when reusing Gas appliance, whether the stopper that needn't spend long-time inspection Gas appliance etc. is closed or whether is had leakage at the utensil in each user house to the pipeline length of fuel gas shutoff device.Thereby, can be accurately and promptly monitor the leakage that causes by the problem in fuel gas pipeline etc., therefore improved convenience or security.

In addition, to achieve these goals, a kind of fuel gas shutoff device according to the present invention comprises: the flow rate detection parts are used for detecting flow velocity by the signal transmission time of measuring media; The flow rate calculation parts, the flow velocity that is used for being detected by the flow rate detection parts is converted to flow; The abnormality juding parts are used to judge whether the use traffic by the flow rate calculation component computes is normal; Cut off parts, be used for judging having when unusual the cut-out flow path when the abnormality juding parts; Reset components is used to export reset signal and gives the cut-out parts to open flow path; The timing piece that resets is used to use reset components to pick up counting; The judging part that resets is used to judge the flow that detected by the flow rate calculation parts whether within predetermined amount of flow after resetting, and changes the decision content of the timing piece that resets; With the leak judgement parts, be used for determining that when the timing piece that resets when detecting the flow that is obtained by the flow rate calculation parts behind the scheduled time slot and be equal to or greater than predetermined amount of flow, output drive signal is given and cut off parts and cut off flow path.

In addition, after the abnormality juding parts detected the unusual user mode of Gas appliance and cut off parts cut-out flow path, in order to reuse Gas appliance, reset components drove the cut-out parts and opens flow path.Yet the combustion gas in pipeline is leaked, and the gaseous-pressure reduction, has closed the utensil plug after cutting off.When carrying out reset operation after that, a large amount of flows begins to flow in pipeline, and the gaseous-pressure in pipeline reaches the supply gaseous-pressure, and pressure reduces when pipeline is full of combustion gas.The period of a large amount of flows is according to the Gas appliance in each user house and the pipeline length between the fuel gas shutoff device and difference though flow, but check in advance and be used for flow is reduced to the period of predetermined amount of flow, sets this period and uses the judgement time of the timing piece that resets to carry out timing subsequently in the timing piece that resets by the use judging part that resets, can postpone leak judgement based on the flow that detects by the flow rate detection parts.Therefore, do not have owing to forgetting that closing the combustion gas plug causes the mistake of leaking to be judged, at that after, become when stablizing when flow, can judge promptly according to the flow of measurement whether Gas appliance is available.Therefore, when reusing Gas appliance, whether the stopper that needn't spend long-time inspection Gas appliance etc. closes or whether the utensil in each user house exists leakage in the pipeline length between the fuel gas shutoff device.Thereby, can be accurately and promptly monitor the leakage that causes by the problem in fuel gas pipeline etc., therefore improved convenience or security.

In addition, to achieve these goals, a kind of fuel gas shutoff device according to the present invention comprises: the flow rate detection parts are used for the signal transmission time of measuring media and detect flow velocity; The flow rate calculation parts, the flow velocity that is used for being detected by the flow rate detection parts is converted to flow; The abnormality juding parts are used to judge whether the use traffic that is obtained by the flow rate calculation parts is normal; Cut off parts, be used for judging having when unusual the cut-out flow path when the abnormality juding parts; Reset components is used to export reset signal and gives the cut-out parts to open flow path; The timing piece that resets is used to use reset components to pick up counting; The flow judging part that resets is used for after the scheduled time slot by the timing piece that resets, and judges whether the flow that detects is equal to or greater than predetermined value; The leak judgement parts, be used for after the flow judging part that resets judges that the flow that is detected is equal to or greater than predetermined amount of flow, judging whether flow is increased to predetermined value, when judging that flow is increased to predetermined value, judge and leak, and output drive signal gives the cut-out parts to cut off flow path.

Cut off when reusing Gas appliance after the flow path by cutting off parts when the unusual user mode that detects Gas appliance at the abnormality detection parts, reset components drives the cut-out parts and opens flow path.Yet the combustion gas in pipeline is leaked, and the gaseous-pressure reduction, has closed the utensil plug after cutting off.When carrying out reset operation, and subsequently, combustion gas fills in the pipeline, and a large amount of flows begins to flow, and flow reduces after pipeline is full of combustion gas.Therebetween, in the timing piece counting timing that resets, can postpone based on leak judgement by flow rate detection flow that parts detect.Subsequently, whether reset flow judging part judgement flow less than predetermined value.When flow is equal to or greater than predetermined value, judge owing to forgetting that closing stopper causes the possibility of leaking big.Whether in addition, also monitor flow increases above predetermined amount of flow.When flow increases and reaches predetermined value subsequently, judge to exist and leak, and carry out and cut off output.Therefore, carrying out reset operation and maintaining tiny flow quantity through behind the scheduled time slot.Subsequently, when not closing the utensil plug well, flow value has the trend of increase.Though be used for changing flow with time of determining to leak according to pipeline length and difference from the utensil in each user house to the fuel gas shutoff device, but can judge leakage well, and no matter the pipeline length condition in each user house, and, can not judge mistakenly that utensil is operable when the Gas appliance plug is when opening through following stable flow rate behind the scheduled time slot by the timing piece that resets.Therefore, can prevent long judgement, and can be accurately and promptly monitor the leakage that causes by the problem in fuel gas pipeline etc., thereby convenience or security improved.

In addition, to achieve these goals, a kind of fuel gas shutoff device according to the present invention comprises: the flow rate detection parts, detect flow velocity by the signal transmission time in the measuring media; The flow rate calculation parts will be converted to flow by the flow velocity that the flow rate detection parts detect; Whether the abnormality juding parts are judged normal by the use traffic of flow rate calculation component computes; Cut off parts, judge when the abnormality juding parts to exist when unusual, cut off flow path; Reset components, output reset signal are given and are cut off parts to open flow path; The timing piece that resets is picked up counting by reset components; The flow judging part that resets after the scheduled time slot by the timing piece counting that resets, judges whether the detection flow of flow rate calculation parts is equal to or greater than predetermined value; The changes in flow rate judging part, when the flow judging part that resets judges that flow is equal to or greater than predetermined amount of flow, the calculated flow rate variable gradient; Infer parts with leakage, infer in scheduled time slot changes in flow rate when the changes in flow rate judging part and will reach predetermined amount of flow or when bigger, judge to exist and leak, and output drive signal is given and cut off parts to cut off flow path.

Cut off when reusing Gas appliance after the flow path by cutting off parts when the unusual user mode that detects Gas appliance at the abnormality detection parts, reset components drives the cut-out parts and opens flow path.Yet the combustion gas in pipeline is leaked, and the gaseous-pressure reduction, has closed the utensil plug after cutting off.When carrying out this reset operation, and subsequently, combustion gas fills in the pipeline, and a large amount of flows begins to flow, and flow reduces after pipeline is full of combustion gas.Therebetween, in the timing piece counting timing that resets, can postpone based on leak judgement by flow rate detection flow that parts detect.Subsequently, the flow judging part that resets judges that flow is whether within predetermined value.When flow is equal to or greater than predetermined value, judges owing to forget that closing stopper causes the possibility of leaking big, and continue to carry out and monitor.In addition, when the changes in flow rate judging part detected the changes in flow rate gradient of increase, leakage was inferred parts and is inferred whether flow increases to the value that is equal to or greater than predetermined amount of flow in scheduled time slot.When flow reaches predetermined value, judge to exist and leak, and carry out and cut off output.Therefore, carrying out reset operation and maintaining tiny flow quantity through behind the scheduled time slot.Subsequently, when not closing the utensil plug well, flow value has the trend of increase.Though be used for changing flow with time of determining to leak according to pipeline length and difference from the utensil in each user house to the fuel gas shutoff device, but can judge leakage well, and no matter the pipeline length condition in each user house, and, can not judge mistakenly that utensil is operable when the Gas appliance plug is when opening through following stable flow rate behind the scheduled time slot by the timing piece that resets.Therefore, can be accurately and promptly monitor the leakage that causes by the problem in fuel gas pipeline etc., thus improved convenience or security.

In addition, to achieve these goals, a kind of fuel gas shutoff device according to the present invention comprises: the flow rate detection parts, detect flow velocity by the signal transmission time in the measuring media; The flow rate calculation parts will be converted to flow by the flow velocity that the flow rate detection parts detect; The abnormality juding parts judge whether the use traffic that is obtained by the flow rate calculation parts is normal; Cut off parts, judge when the abnormality juding parts to exist when unusual, cut off the flow path that MEDIA FLOW is crossed; Pressure detecting part detects the pressure in the flow path; The pressure judging part judges whether the detected pressures of pressure detecting part is equal to or less than predetermined pressure; Reset components, output reset signal are given and are cut off parts to open flow path; The timing piece that resets is based on the reset operation of reset components and pick up counting; With the leak judgement parts, when reset timing piece counting process scheduled time slot and pressure judging part judged that the pressure that is detected is equal to or less than predetermined pressure, output drive signal was given and is cut off parts to cut off flow path.

Cut off when reusing Gas appliance after the flow path by cutting off parts when the unusual user mode that detects Gas appliance at the abnormality detection parts, reset components drives the cut-out parts and opens flow path.Yet the combustion gas in pipeline is leaked, and the gaseous-pressure reduction, has closed the utensil plug after cutting off.When carrying out this reset operation, and subsequently, combustion gas fills in the pipeline, and a large amount of flows begins to flow to be filled in the pipeline.Subsequently, flow reduces, and pressure is increased to the blockage pressure level.Therebetween, in the timing piece timing that resets, can postpone based on leak judgement by flow rate detection flow that parts detect.Therefore, do not have owing to forgetting that closing stopper causes the mistake of leaking to be judged, according to after that, judging promptly whether Gas appliance is available when the flow measured flow that becomes when stablizing.Therefore, when reusing Gas appliance, whether the stopper that needn't spend long-time inspection Gas appliance etc. closes or whether the utensil in each user house exists leakage to the pipeline length of fuel gas shutoff device.Thereby, can be accurately and promptly monitor the leakage that causes by the problem in fuel gas pipeline etc., therefore improved convenience or security.

In addition, to achieve these goals, a kind of fuel gas shutoff device according to the present invention comprises: the flow rate detection parts, detect flow velocity by the signal transmission time in the measuring media; The flow rate calculation parts will be converted to flow by the flow velocity that the flow rate detection parts detect; The abnormality juding parts judge whether the use traffic that is obtained by the flow rate calculation parts is normal; Cut off parts, judge when the abnormality juding parts to exist when unusual, cut off the flow path that MEDIA FLOW is crossed; Pressure detecting part detects the pressure in the flow path; Reset components, output reset signal are given and are cut off parts to open flow path; The timing piece that resets uses reset components and picks up counting; The pressure memory unit, the pressure that detects by pressure detecting part when being stored in the utensil use; With the leak judgement parts, when reset timing piece counting process scheduled time slot and pressure judging part judged that the pressure that is detected is equal to or less than predetermined pressure, output drive signal was given and is cut off parts to cut off flow path.

Cut off when reusing Gas appliance after the flow path by cutting off parts when the unusual user mode that detects Gas appliance at the abnormality detection parts, reset components drives the cut-out parts and opens flow path.Yet the combustion gas in pipeline is leaked, and the gaseous-pressure reduction, has closed the utensil plug after cutting off.When carrying out this reset operation, and subsequently, combustion gas fills in the pipeline, and a large amount of flows begins to flow to be filled in the pipeline.Subsequently, flow reduces, and pressure reaches the original blockage pressure greater than the controlled pressure of pressure memory unit.Though be used for flowing the period of a large amount of flows according to being placed on Gas appliance in each user house and the pipeline length between the fuel gas shutoff device difference, but check in advance and be used for flow is reduced to the period of predetermined amount of flow, sets this period and uses the judgement time of the timing piece that resets to carry out timing subsequently in the timing piece that resets by the use judging part that resets, can prevent leak judgement based on the mistake of the flow that uses the flow rate detection parts to detect.Therefore, do not have owing to forgetting that closing the combustion gas plug causes the mistake of leaking to be judged, compare by the pressure that will after that, measure and the controlled pressure of utensil between the operating period that is stored in the pressure memory unit, can judge promptly whether Gas appliance is available.Therefore, when reusing Gas appliance, whether the stopper that needn't spend long-time inspection Gas appliance etc. closes or whether the utensil in each user house exists leakage in the pipeline length between the fuel gas shutoff device.Thereby, can be accurately and promptly monitor the leakage that causes by the problem in fuel gas pipeline etc., therefore improved convenience or security.

In addition, to achieve these goals, a kind of fuel gas shutoff device according to the present invention comprises: the flow rate detection parts, detect flow velocity by the signal transmission time in the measuring media; The flow rate calculation parts will be converted to flow by the flow velocity that the flow rate detection parts detect; The abnormality juding parts judge whether the use traffic that is obtained by the flow rate calculation parts is normal; Cut off parts, judge when the abnormality juding parts to exist when unusual, cut off the flow path that MEDIA FLOW is crossed; Pressure detecting part detects the pressure in the flow path; Reset components, output reset signal are given and are cut off parts to open flow path; The timing piece that resets picks up counting according to the reset operation of reset components; The pressure memory unit is stored in the fluid pressure that utensil is detected by pressure detecting part when not using; Pressure changes judging part, when resetting timing piece counting process scheduled time slot, determines the pressure variable gradient according to the output signal of pressure detecting part; Infer parts with leakage, infer to change and to reach predetermined pressure or more hour, judge to exist and leak, and output drive signal is given and cut off parts to cut off flow path in the scheduled time slot internal pressure when pressure changes judging part.

Cut off when reusing Gas appliance after the flow path by cutting off parts when the unusual user mode that detects Gas appliance at the abnormality detection parts, reset components drives the cut-out parts and opens flow path.Yet the combustion gas in pipeline is leaked, and the gaseous-pressure reduction, has closed the utensil plug after cutting off.When carrying out this reset operation, and subsequently, combustion gas fills in the pipeline, and a large amount of flows begins to flow to be filled in the pipeline.Subsequently, flow reduces, and pressure is increased to the blockage pressure level.Therebetween, in the timing piece timing that resets, can prevent based on leak judgement by the mistake of flow rate detection flow that parts detect.Even,, also can judge to exist and leak by variation or pressure and the reduction of detection that monitoring working pressure detection part detects from the blockage pressure level to the controlled pressure level when the user forgets the shut-off plug period of the day from 11 p.m. to 1 a.m.The variation of pressure is used for promptly judging whether Gas appliance is available.Therefore, when reusing Gas appliance, whether the stopper that needn't spend long-time inspection Gas appliance etc. closes or whether the utensil in each user house exists leakage to the pipeline length of fuel gas shutoff device.Thereby, can be accurately and promptly monitor the leakage that causes by the problem in fuel gas pipeline etc., therefore improved convenience or security.

In addition, to achieve these goals, a kind of fuel gas shutoff device according to the present invention comprises: the flow rate detection parts, detect flow velocity by the signal transmission time in the measuring media; The flow rate calculation parts will be converted to flow by the flow velocity that the flow rate detection parts detect; Whether the abnormality juding parts are judged normal by the use traffic of flow rate calculation component computes; Cut off parts, judge when the abnormality juding parts to exist when unusual, cut off flow path; Pressure detecting part detects the pressure in the flow path; Reset components, output reset signal are given and are cut off parts to open flow path; The timing piece that resets is based on the reset operation of reset components and pick up counting; The pressure memory unit, the pressure that detects by pressure detecting part when being stored in the utensil use; The pressure judging part judges whether the pressure that is detected by pressure detecting part is equal to or less than the pressure that is stored in the pressure memory unit; With preferential leak judgement parts, according in following two decision signals early decision signal and output drive signal is given and is cut off parts to cut off flow path, wherein these two decision signals are, decision signal of exporting through scheduled time slot and when judging that the flow that is detected by the flow rate detection parts is equal to or greater than predetermined value when the timing piece counting of resetting and the decision signal of when the pressure that will be detected by pressure detecting part and the pressure stored in memory unit compare and judges that this pressure is equal to or less than predetermined pressure, exporting.

Cut off when reusing Gas appliance after the flow path by cutting off parts when the unusual user mode that detects Gas appliance at the abnormality detection parts, reset components drives the cut-out parts and opens flow path.Yet the combustion gas in pipeline is leaked, and the gaseous-pressure reduction, has closed the utensil plug after cutting off.When carrying out this reset operation, and subsequently, combustion gas fills in the pipeline, and a large amount of flows begins to flow to be filled in the pipeline.Subsequently, flow reduces, and pressure returns to the blockage pressure level.Yet, when resetting the timing piece timing, prevented leak judgement based on the mistake of the flow that uses the flow rate detection parts to detect.Subsequently, the flow judging part that resets judges that flow is whether within predetermined value.When flow is equal to or greater than predetermined value, judges owing to forget that closing stopper causes the possibility of leaking big, and continue to carry out and monitor.In addition, when pressure detecting part detects variation from the blockage pressure to the controlled pressure, judge that the possibility of leaking is high.Whether be equal to or greater than predetermined amount of flow or whether detect in the variation both of these case from the blockage pressure to the controlled pressure the earliest one based on the flow that detects by the flow detection Returning part from the pressure signal of pressure detecting part, even the leak judgement parts detect the situation of also not closing the utensil plug after reset operation well, stop gas supply once more.Though be used for changing flow with time of determining to leak according to pipeline length and difference from the utensil in each user house to the fuel gas shutoff device, but can judge leakage well according to the pipeline length condition in each user house, can be in that the Gas appliance plug judge that mistakenly utensil is operable when being to open through following stable flow rate behind the scheduled time slot by the timing piece that resets.In addition, can be accurately and promptly monitor the leakage that causes by the problem in fuel gas pipeline etc., thus improved convenience or security.

Below, 1～8 first to the 8th embodiment of the present invention is described with reference to the accompanying drawings.In Fig. 1～8, identical Reference numeral is represented to have with those of Fig. 9 and is had the similar elements of said function.In addition, the present invention is not limited to these embodiment.

(first embodiment)

Fig. 1 shows the fuel gas shutoff device according to first embodiment of the invention.Reference numeral 17 expression flow rate detection parts, it sends ultrasonic signal between upstream oscillator 18 and downstream oscillator 19, and based on it transmission time and detect the flow velocity that uses combustion gas, upstream oscillator 18 and downstream oscillator 19 relatively are installed in the flow path 1 of combustion gas medium of town gas for example or LPG.For example, flow rate detection parts 17 can followingly be constructed.Concrete, flow rate detection parts 17 comprise switching Returning part 20, send Returning part 21, receive Returning part 22, repeat Returning part 23 and transmission time measurement Returning part 24.Send Returning part 21 and receive Returning part 22 and be connected to switching Returning part 20.Switch Returning part 20 and alternately change the connection destination that sends between Returning part 21 and the reception Returning part 22, thereby will send Returning part 21 and receive Returning part 22 and be connected respectively to upstream oscillator 18 and downstream oscillator 19, and subsequently, send Returning part 21 and be connected respectively to downstream oscillator 19 and upstream oscillator 18 with reception Returning part 22.When use to switch Returning part 20 will receive Returning part 22 be connected to upstream oscillator 18, when sending Returning part 21 and be connected to downstream oscillator 19 simultaneously, transmit by flow path from upstream oscillator 18 from the ultrasonic signal that sends Returning part 21 transmissions, and receive reception Returning part 22 from downstream oscillator 19 subsequently.Repeat Returning part 23 and repeat this transmission/reception of ultrasonic signal, and use transmission time measurement Returning part 24 to repeat the measurement of this signal transmission time therebetween.Transmission time measurement Returning part 24 is measured and accumulative total receives the shared time from sending to of this ultrasonic signal.Subsequently, be connected respectively to downstream oscillator 19 and upstream oscillator 18, repeat aforementioned operation by using switching Returning part 20 will receive Returning part 22 and sending Returning part 21.Transmission time measurement Returning part 24 obtains switching the transmission time difference that Returning part 20 switches between the signal transmission time of measuring the destination in the transmission time that obtains by initial received ultrasonic signal and by using.

Reference numeral 25 expression flow rate calculation parts, its transmission time that is obtained by conversion obtains the amount of working medium, i.e. gas flow.Reference numeral 26 expression abnormality juding parts, the combustion gas use amount that it obtains based on use traffic calculating unit 25 and judge whether there is unusual user mode.For example, whether there is unusual user mode in order to monitor, abnormality juding parts 26 storage aggregate flow cut-out values or cut-out service time table, aggregate flow cut-out value is used for detecting the unusual a large amount of flow that is produced when the flexible pipe of having removed for some reason to using appliance (for example stove) supply combustion gas, cut-out service time table defines the pot life, this pot life is somebody's turn to do the maximum service time that be longer than common this utensil of use than the long time corresponding to the situation of using this utensil long period.Parts 27 are cut off in Reference numeral 27 expressions, and it is exported shutoff signal and cut off combustion gas path 1 when there is abnormality in 26 judgements of abnormality juding parts.Reference numeral 28 expression reset units, it uses the reset instruction that detections such as switch send and drives shearing device opens flow path, and described reset instruction is used to open owing to abnormality is cut off the flow path that parts 27 close and makes the combustion gas medium available once more.Reference numeral 29 represents to reset timing piece, it carries out timing after the action of reset components 28, and stops the object that will leak as judgement by the flow that uses flow rate detection parts 17 detection flow velocitys and use traffic calculating unit 25 that its calculating is obtained therebetween.Reference numeral 30 expression leak judgement parts, it is using reset components 28 to open to cut off after the parts 27 and the timing piece 29 that resets subsequently counted scheduled time slot, whether be zero or deny within predetermined amount of flow by the flow value that uses flow rate detection parts 17 detection flow velocitys to judge that use traffic calculating unit 25 obtains, and when judging that flow value is non-vanishing or not within predetermined amount of flow the time, leak judgement parts 30 output shutoff signals are given and cut off parts 27.Reference numeral 31 expression report Returning parts when it judges that when abnormality juding parts 26 existing unusual combustion gas user mode also to drive cuts off parts 27, show the interior perhaps state of rupturing operation, and by report gas safe Surveillance center such as telephone wires.

Below, with the operation of explanation said structure parts.After the fuel gas shutoff device is installed, use the user mode of the Fluid Volume monitoring Gas appliance that detects by flow detection Returning part 17.When in the user house, using for a long time the Gas appliance of gas furnace for example or water heater unusually or when removing gas hose for some reason, leaking combustion gas unusually, cut off the supply of combustion gas owing to the unusual user mode of Gas appliance.Whether abnormality juding parts 26 are long unusually by judging the transmission time of using flow rate detection parts 17 to detect, judge and use gas quantity whether in the normal discharge scope or be not unusually greater than the flow value of predetermined value, the flow value that uses gas quantity promptly to be to use flow rate calculation parts 25 to convert from flow speed value.Now, will the exemplary operations of flow rate detection parts 17 be described.

Be installed between upstream oscillator 18 in the flow path 1 (that is fuel gas pipeline) and the downstream oscillator 19 in inclination and send and received ultrasonic signal.Use to switch Returning part 20 and will send Returning part 21 and be connected to upstream oscillator 18, be connected to downstream oscillator 19, pass through the signal of downstream oscillator 19 from upstream oscillator 18 thereby receive by what send Returning part 21 transmissions and will receive Returning part 22.Carry out this operation with the pre-determined number that repeats Returning part 23 settings, to constitute so-called single loop system.Transmission time measurement Returning part 24 obtains to receive by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22 by accumulation.

Subsequently, use and switch Returning part 20, will send Returning part 21 and be connected to downstream oscillator 19, be connected to upstream oscillator 18 and will receive Returning part 22.Ultrasonic signal is exported from sending Returning part 21, and is received by the reception Returning part 22 that is connected to upstream oscillator 18 by downstream oscillator 19 and flow path 1.Similar to above-mentioned explanation, to carry out this operation with the same number of times that repeats Returning part 23 settings.Transmission time measurement Returning part 24 is by accumulation, acquisition receives by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22, and transmission time measurement Returning part 24 obtains in the transmission time that takies when the upstream sends to the downstream when ultrasonic signal and sends to transmission time difference between transmission time of upstream from the downstream.Subsequently, in the transmission time that flow rate calculation parts 25 will be obtained by transmission time measurement Returning part 19, promptly flow speed value V is converted to flow value Q.In Fig. 1, Reference numeral A represents the flow direction of combustion gas medium.

When abnormality juding parts 26 were judged the Traffic Anomaly that is obtained, shutoff signal outputs to cut off parts 27.Thereby, drive and cut off parts 27, and close flow path 1 to stop gas supply.In addition, when the output shutoff signal, the content of this cut-out is presented on the report Returning part 31.When having removed this cut-out cause, for example, when having reinstalled the flexible pipe of wrong installation, reset components 28 actions, and drive cut-out parts 27, open flow path.Subsequently, by reference flow, differentiate Gas appliance user or gas supply person and whether removed this cut-out cause fully.When owing to unusual a large amount of flow cuts off combustion gas (promptly, aggregate flow cuts off) time, when correcting a mistake the gas hose of installing and when cut off owing to the long-time use of the Gas appliance of for example stove combustion gas (, cut off service time) time, the combustion gas that remains in the pipeline is discharged naturally, up to having removed the cut-out cause, for example up to the pipe close of having closed Gas appliance.Just opened after the stopper, in the downstream of shutoff valve, had pressure reduction.Therefore, a large amount of flows flow through, and reach supply pressure up to lowered gaseous-pressure in the pipeline of downstream.When pressure after that becomes when even, the flow speed value vanishing that detects by flow rate detection parts 17 or near zero value.Yet, when reset components 28 actions are cut off parts 27 to open under situation that remove not cut off cause for some reason, a large amount of traffic flow, and subsequently, flow begins to become and approaches zero value.Yet, open owing to be arranged on the Gas appliance plug in pipeline 1 downstream, so even all be full of combustion gas, flow still increases and turn back to the gas supply state of firm measurement before cutting off gradually.When after reset components 28 is opened cut-out parts 27, using the timing piece 29 that resets through scheduled time slots, just will be chosen as the object of leak judgement, carry out leak judgement through the flow of measuring after the scheduled time slot but be to use by the flow that flow rate detection parts 17 detect.Leak judgement parts 29 judge whether gas flow is equal to or greater than predetermined amount of flow, wherein detect flow velocity through using flow rate detection parts 17 behind the scheduled time slot by the timing piece 29 that resets in use, and use traffic calculating unit 25 is converted into flow, obtains described gas flow.When leak judgement parts 29 detected predetermined amount of flow or bigger flow, there was gas leakage in its judgement, and once more shutoff signal was outputed to cut-out parts 27 with the stop supplies combustion gas.In other words, owing to whether removed the cut-out cause by using 17 detections of flow rate detection parts whether to have gas-flow to judge, even when also not judging the existence leakage mistakenly when parts 27 make it to open and detect the transition state that is full of combustion gas in the pipeline, therefore can judge whether there is leakage at short notice simultaneously by driving to cut off.When the state that is detected is just often, that is, when not detecting gas flow, judge and removed the cut-out cause, and open flow path 1, thereby Gas appliance is returned to normal operating condition.

Therefore, do not rely on the variation of flow in the pipeline, whether whether the flow velocity signal judgement of use flow rate detection parts 17 exists gas leakage detect abnormality between the operating period of Gas appliance after, and judge and use reset components 28 to recover cut-out parts 27.Therefore, can judge at short notice and can reuse this Gas appliance.In addition, when cutting off owing to unusual big flow, aggregate flow or service time, wrong judgement was carried out in cut-out, can differentiate the removal of cutting off cause or original pipe close of not closed Gas appliance fully at short notice.Therefore, can improve the convenience and the security of use.

(second embodiment)

Fig. 2 shows the fuel gas shutoff device according to second embodiment of the invention.In Fig. 2, identical Reference numeral represent with Fig. 1,3,4 and 9 those have the similar elements of said function, and omitted their explanation.

In Fig. 2, Reference numeral 32 represents to reset judging part.Reset components 28 work, and timing piece 29 countings that reset are through scheduled time slot.Therebetween, a large amount of traffic flow, the gaseous-pressure in pipeline reaches and the identical pressure in upstream that cuts off parts 27.Because for the pipeline length of each user house between fuel gas shutoff device and Gas appliance is different, so it is also different to the time of uniform pressure to be full of pipeline.Yet, in each the installation, learn this time in advance, and be set in the timing piece 29 that resets.

Below, with the operation of explanation said structure parts.After the fuel gas shutoff device is installed, use the user mode of the traffic monitoring Gas appliance that detects by flow rate detection parts 17.When in the user house, using for a long time the Gas appliance of gas furnace for example or water heater unusually or when removing gas hose for some reason, leaking combustion gas unusually, cut off the supply of combustion gas owing to the unusual user mode of Gas appliance.Whether abnormality juding parts 26 are long unusually by judging the transmission time of using flow rate detection parts 17 to detect, judge and use gas quantity whether in the normal discharge scope or be not unusually greater than the flow value of predetermined value, the flow value that uses gas quantity promptly to be to use flow rate calculation parts 25 to convert from flow speed value.Now, will the exemplary operations of flow rate detection parts 17 be described.

Be installed between upstream oscillator 18 in the flow path 1 (that is fuel gas pipeline) and the downstream oscillator 19 in inclination and send and received ultrasonic signal.Use to switch Returning part 20 and will send Returning part 21 and be connected to upstream oscillator 18, be connected to downstream oscillator 19, pass through the signal of downstream oscillator 19 from upstream oscillator 18 thereby receive by what send Returning part 21 transmissions and will receive Returning part 22.Carry out this operation with the pre-determined number that repeats Returning part 23 settings, to constitute so-called single loop system.Transmission time measurement Returning part 24 obtains to receive by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22 by accumulation.

Subsequently, use and switch Returning part 20, will send Returning part 21 and be connected to downstream oscillator 19, be connected to upstream oscillator 18 and will receive Returning part 22.Ultrasonic signal is exported from sending Returning part 21, and is received by the reception Returning part 22 that is connected to upstream oscillator 18 by downstream oscillator 19 and flow path 1.Similar to above-mentioned explanation, to carry out this operation with the same number of times that repeats Returning part 23 settings.Transmission time measurement Returning part 24 is by accumulation, acquisition receives by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22, and transmission time measurement Returning part 24 obtains in the transmission time that takies when the upstream sends to the downstream when ultrasonic signal and sends to transmission time difference between transmission time of upstream from the downstream.Subsequently, in the transmission time that flow rate calculation parts 25 will be obtained by transmission time measurement Returning part 19, promptly flow speed value V is converted to flow value Q.In Fig. 1, Reference numeral A represents the flow direction of combustion gas medium.

When abnormality juding parts 26 were judged the Traffic Anomaly that is obtained, shutoff signal outputs to cut off parts 27.Thereby, drive and cut off parts 27, and close flow path 1 to stop gas supply.In addition, when the output shutoff signal, the content of this cut-out is presented on the report Returning part 31.When having removed this cut-out cause, for example, when having reinstalled the flexible pipe of wrong installation, reset components 28 actions, and drive cut-out parts 27, open flow path.Subsequently, by reference flow, differentiate Gas appliance user or gas supply person and whether removed this cut-out cause fully.When owing to unusual a large amount of flow cuts off combustion gas (promptly, aggregate flow cuts off) time, when correcting a mistake the gas hose of installing and when cut off owing to the long-time use of the Gas appliance of for example stove combustion gas (, cut off service time) time, the combustion gas that remains in the pipeline is discharged naturally, up to having removed the cut-out cause, for example up to the pipe close of having closed Gas appliance.Just opened after the stopper, in the downstream of shutoff valve, had pressure reduction.Therefore, a large amount of flows flow through, and reach supply pressure up to lowered gaseous-pressure in the pipeline of downstream.When pressure after that becomes when even, the flow speed value vanishing that detects by flow rate detection parts 17 or near zero value.Yet, when reset components 28 actions are cut off parts 27 to open under situation that remove not cut off cause for some reason, a large amount of traffic flow, and subsequently, flow begins to become and approaches zero value.Yet, open owing to be arranged on the Gas appliance plug in pipeline 1 downstream, so even all be full of combustion gas, flow still increases and turn back to the gas supply state of firm measurement before cutting off gradually.When after reset components 28 is opened cut-out parts 27, using the timing piece 29 that resets through scheduled time slots, just will be chosen as the object of leak judgement, carry out leak judgement through the flow of measuring after the scheduled time slot but be to use by the flow that flow rate detection parts 17 detect.In this case, because fuel gas shutoff device in each user house and the pipeline length between the Gas appliance are different.Though a large amount of traffic flow after stopper is opened, pressure reduction up to the upstream of the cut-out parts 27 in pipeline 1, but the judging part 32 that resets is by study in advance, in each user house, flow big flow and make time of fluid stable of judgement, and learning value is set at the decision content of the timing piece 29 that resets.

Leak judgement parts 29 judge whether gas flow is equal to or greater than predetermined amount of flow, wherein detect flow velocity through using flow rate detection parts 17 behind the scheduled time slot by the timing piece 29 that resets in use, and use traffic calculating unit 25 is converted into flow, obtains described gas flow.When leak judgement parts 29 detected predetermined amount of flow or bigger flow, there was gas leakage in its judgement, and once more shutoff signal was outputed to cut-out parts 27 with the stop supplies combustion gas.In other words, owing to whether removed the cut-out cause by using 17 detections of flow rate detection parts whether to have gas-flow to judge, even when also not judging the existence leakage mistakenly when parts 27 make it to open and detect the transition state that is full of combustion gas in the pipeline, therefore can judge whether there is leakage at short notice simultaneously by driving to cut off.When the state that is detected is just often, that is, when not detecting gas flow, judge and removed the cut-out cause, and open flow path 1, thereby Gas appliance is returned to normal operating condition.

Therefore, do not rely on the variation of flow in the pipeline, whether whether the flow velocity signal judgement of use flow rate detection parts 17 exists gas leakage detect abnormality between the operating period of Gas appliance after, and judge and use reset components 28 to recover cut-out parts 27.Therefore, can judge at short notice and can reuse this Gas appliance.In addition, when cutting off owing to unusual big flow, aggregate flow or service time, wrong judgement was carried out in cut-out, can differentiate the removal of cutting off cause or original pipe close of not closed Gas appliance fully at short notice.Therefore, can improve the convenience and the security of use.

(the 3rd embodiment)

Fig. 3 shows the fuel gas shutoff device according to third embodiment of the invention.In Fig. 3, identical Reference numeral represent with Fig. 1,2,4 and 9 those have the similar elements of said function, and omitted their explanation.

In Fig. 3, Reference numeral 33 represents to reset the flow judging part.Reset components 28 work, and timing piece 29 countings that reset are through scheduled time slot.Therebetween, a large amount of traffic flow, the gaseous-pressure in pipeline reaches and the identical pressure in upstream that cuts off parts 27.Because for the pipeline length of each user house between fuel gas shutoff device and Gas appliance is different, so arrive uniform pressure in case pipeline is filled combustion gas, flow just is reduced to and approaches zero value.Yet when remove cutting off cause for some reason and the utensil plug returned to open mode, flow is non-vanishing, and small flow continues to flow.Judge whether this small flow is equal to or greater than the predetermined amount of flow value.

Below, with the operation of explanation said structure parts.After the fuel gas shutoff device is installed, use the user mode of the traffic monitoring Gas appliance that detects by flow rate detection parts 17.When in the user house, using for a long time the Gas appliance of gas furnace for example or water heater unusually or when removing gas hose for some reason, leaking combustion gas unusually, cut off the supply of combustion gas owing to the unusual user mode of Gas appliance.Whether abnormality juding parts 26 are long unusually by judging the transmission time of using flow rate detection parts 17 to detect, judge and use gas quantity whether in the normal discharge scope or be not unusually greater than the flow value of predetermined value, the flow value that uses gas quantity promptly to be to use flow rate calculation parts 25 to convert from flow speed value.Now, will the exemplary operations of flow rate detection parts 17 be described.

Be installed between upstream oscillator 18 in the flow path 1 (that is fuel gas pipeline) and the downstream oscillator 19 in inclination and send and received ultrasonic signal.Use to switch Returning part 20 and will send Returning part 21 and be connected to upstream oscillator 18, be connected to downstream oscillator 19, pass through the signal of downstream oscillator 19 from upstream oscillator 18 thereby receive by what send Returning part 21 transmissions and will receive Returning part 22.Carry out this operation with the pre-determined number that repeats Returning part 23 settings, to constitute so-called single loop system.Transmission time measurement Returning part 24 obtains to receive by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22 by accumulation.

Subsequently, use and switch Returning part 20, will send Returning part 21 and be connected to downstream oscillator 19, be connected to upstream oscillator 18 and will receive Returning part 22.Ultrasonic signal is exported from sending Returning part 21, and is received by the reception Returning part 22 that is connected to upstream oscillator 18 by downstream oscillator 19 and flow path 1.Similar to above-mentioned explanation, to carry out this operation with the same number of times that repeats Returning part 23 settings.Transmission time measurement Returning part 24 is by accumulation, acquisition receives by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22, and transmission time measurement Returning part 24 obtains in the transmission time that takies when the upstream sends to the downstream when ultrasonic signal and sends to transmission time difference between transmission time of upstream from the downstream.Subsequently, in the transmission time that flow rate calculation parts 25 will be obtained by transmission time measurement Returning part 19, promptly flow speed value V is converted to flow value Q.In Fig. 1, Reference numeral A represents the flow direction of combustion gas medium.

When abnormality juding parts 26 were judged the Traffic Anomaly that is obtained, shutoff signal outputs to cut off parts 27.Thereby, drive and cut off parts 27, and close flow path 1 to stop gas supply.In addition, when the output shutoff signal, the content of this cut-out is presented on the report Returning part 31.When having removed this cut-out cause, for example, when having reinstalled the flexible pipe of wrong installation, reset components 28 actions, and drive cut-out parts 27, open flow path.Subsequently, by reference flow, differentiate Gas appliance user or gas supply person and whether removed this cut-out cause fully.When owing to unusual a large amount of flow cuts off combustion gas (promptly, aggregate flow cuts off) time, when correcting a mistake the gas hose of installing and when cut off owing to the long-time use of the Gas appliance of for example stove combustion gas (, cut off service time) time, the combustion gas that remains in the pipeline is discharged naturally, up to having removed the cut-out cause, for example up to the pipe close of having closed Gas appliance.Just opened after the stopper, in the downstream of shutoff valve, had pressure reduction.Therefore, a large amount of flows flow through, and reach supply pressure up to lowered gaseous-pressure in the pipeline of downstream.When pressure after that becomes when even, the flow speed value vanishing that detects by flow rate detection parts 17 or near zero value.Yet, when reset components 28 actions are cut off parts 27 to open under situation that remove not cut off cause for some reason, a large amount of traffic flow, and subsequently, flow begins to become and approaches zero value.Yet, open owing to be arranged on the Gas appliance plug in pipeline 1 downstream, so even all be full of combustion gas, flow still increases and turn back to the gas supply state of firm measurement before cutting off gradually.When after reset components 28 is opened cut-out parts 27, using the timing piece 29 that resets through scheduled time slots, just will be chosen as the object of leak judgement, carry out leak judgement through the flow of measuring after the scheduled time slot but be to use by the flow that flow rate detection parts 17 detect.In this case, fuel gas shutoff device in each user house and the pipeline length between the Gas appliance are different.Though a large amount of traffic flow after stopper is opened, pressure reduction up to the upstream of the cut-out parts 27 in pipeline 1, but when not removing for some reason when cutting off cause and when opening the utensil plug, carrying out reset operation subsequently, a large amount of traffic flow and subsequently stability of flow near zero small value.Whether the flow judging part 33 judgements stable tiny flow quantity after relatively large traffic flow that resets is equal to or greater than the predetermined value about each user house.When this tiny flow quantity is equal to or greater than predetermined value, possibility of judge to exist leaking, and the flow judging part 33 that resets do not judge wherein combustion gas can with reset operation whether finish but continuation leak judgement.

When use resets after flow judging part 33 detects predetermined tiny flow quantity, leak judgement parts 29 judge whether gas flow is increased to predetermined amount of flow, wherein by using flow rate detection parts 17 to detect flow velocity, and use traffic calculating unit 25 is converted into flow, obtains described gas flow.Though a large amount of traffic flow makes the pressure in the pipeline 1 become the value identical with upstream pressure, and flow becomes the value near zero, and when opening stopper in the downstream, flow is non-vanishing, but continues to flow near zero tiny flow quantity.When this small flow continued stably to flow scheduled time slot, flow began to increase, and final, and the initial flow of measuring when opening the utensil plug flows through.When leak judgement parts 29 detect predetermined amount of flow or bigger flow, judge to have gas leakage, and once more shutoff signal is outputed to cut-out parts 27 with the stop supplies combustion gas.In other words, owing to whether removed the cut-out cause by using 17 detections of flow rate detection parts whether to have gas-flow to judge, even when also not judging the existence leakage mistakenly when parts 27 make it to open and detect the transition state that is full of combustion gas in the pipeline, therefore can judge whether there is leakage at short notice simultaneously by driving to cut off.When the state that is detected is just often, that is, when not detecting gas flow, judge and removed the cut-out cause, and open flow path 1, thereby Gas appliance is returned to normal operating condition.

Therefore, do not rely on the variation of flow in the pipeline and do not rely on pipeline length in each user house, whether whether the flow velocity signal judgement of use flow rate detection parts 17 exists gas leakage detect abnormality between the operating period of Gas appliance after, and judge and use reset components 28 to recover cut-out parts 27.Therefore, can judge at short notice and can reuse this Gas appliance.In addition, when cutting off owing to unusual big flow, aggregate flow or service time, wrong judgement was carried out in cut-out, can differentiate the removal of cutting off cause or original pipe close of not closed Gas appliance fully at short notice.Therefore, can improve the convenience and the security of use.

(the 4th embodiment)

Fig. 4 shows the fuel gas shutoff device according to fourth embodiment of the invention.In Fig. 4, identical Reference numeral represent with Fig. 1,2,3 and 9 those have the similar elements of said function, and omitted their explanation.

In Fig. 4, Reference numeral 34 expression changes in flow rate judging parts.Reset components 28 work, and timing piece 29 countings that reset are through scheduled time slot.Therebetween, a large amount of traffic flow, the gaseous-pressure in pipeline reaches and the identical pressure in upstream that cuts off parts 27.Because for the pipeline length of each user house between fuel gas shutoff device and Gas appliance is different, so arrive uniform pressure in case pipeline is filled combustion gas, flow just is reduced to and approaches zero value.Yet when remove cutting off cause for some reason and the utensil plug returned to open mode, flow is non-vanishing, and small flow continues to flow.Subsequently, this flow increases gradually.Changes in flow rate judging part 34 judges whether this changes in flow rate gradient is equal to or greater than predetermined value.Reference numeral 35 expressions are leaked and are inferred parts, and when changes in flow rate judging part 34 detected a changes in flow rate gradient, it judged corresponding to the leakage flow after the scheduled time slot of this variable gradient whether reached predetermined value.

Below, with the operation of explanation said structure parts.After the fuel gas shutoff device is installed, use the user mode of the traffic monitoring Gas appliance that detects by flow rate detection parts 17.When in the user house, using for a long time the Gas appliance of gas furnace for example or water heater unusually or when removing gas hose for some reason, leaking combustion gas unusually, cut off the supply of combustion gas owing to the unusual user mode of Gas appliance.Whether abnormality juding parts 26 are long unusually by judging the transmission time of using flow rate detection parts 17 to detect, judge and use gas quantity whether in the normal discharge scope or be not unusually greater than the flow value of predetermined value, the flow value that uses gas quantity promptly to be to use flow rate calculation parts 25 to convert from flow speed value.Now, will the exemplary operations of flow rate detection parts 17 be described.

Be installed between upstream oscillator 18 in the flow path 1 (that is fuel gas pipeline) and the downstream oscillator 19 in inclination and send and received ultrasonic signal.Use to switch Returning part 20 and will send Returning part 21 and be connected to upstream oscillator 18, be connected to downstream oscillator 19, pass through the signal of downstream oscillator 19 from upstream oscillator 18 thereby receive by what send Returning part 21 transmissions and will receive Returning part 22.Carry out this operation with the pre-determined number that repeats Returning part 23 settings, to constitute so-called single loop system.Transmission time measurement Returning part 24 obtains to receive by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22 by accumulation.

Subsequently, use and switch Returning part 20, will send Returning part 21 and be connected to downstream oscillator 19, be connected to upstream oscillator 18 and will receive Returning part 22.Ultrasonic signal is exported from sending Returning part 21, and is received by the reception Returning part 22 that is connected to upstream oscillator 18 by downstream oscillator 19 and flow path 1.Similar to above-mentioned explanation, to carry out this operation with the same number of times that repeats Returning part 23 settings.Transmission time measurement Returning part 24 is by accumulation, acquisition receives by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22, and transmission time measurement Returning part 24 obtains in the transmission time that takies when the upstream sends to the downstream when ultrasonic signal and sends to transmission time difference between transmission time of upstream from the downstream.Subsequently, in the transmission time that flow rate calculation parts 25 will be obtained by transmission time measurement Returning part 19, promptly flow speed value V is converted to flow value Q.In Fig. 1, Reference numeral A represents the flow direction of combustion gas medium wherein.

When abnormality juding parts 26 were judged the Traffic Anomaly that is obtained, shutoff signal outputs to cut off parts 27.Thereby, drive and cut off parts 27, and close flow path 1 to stop gas supply.In addition, when the output shutoff signal, the content of this cut-out is presented on the report Returning part 31.When having removed this cut-out cause, for example, when having reinstalled the flexible pipe of wrong installation, reset components 28 actions, and drive cut-out parts 27, open flow path.Subsequently, by reference flow, differentiate Gas appliance user or gas supply person and whether removed this cut-out cause fully.When owing to unusual a large amount of flow cuts off combustion gas (promptly, aggregate flow cuts off) time, when correcting a mistake the gas hose of installing and when cut off owing to the long-time use of the Gas appliance of for example stove combustion gas (, cut off service time) time, the combustion gas that remains in the pipeline is discharged naturally, up to having removed the cut-out cause, for example up to the pipe close of having closed Gas appliance.Just opened after the stopper, in the downstream of shutoff valve, had pressure reduction.Therefore, a large amount of flows flow through, and reach supply pressure up to lowered gaseous-pressure in the pipeline of downstream.When pressure after that becomes when even, the flow speed value vanishing that detects by flow rate detection parts 17 or near zero value.Yet, when reset components 28 actions are cut off parts 27 to open under situation that remove not cut off cause for some reason, a large amount of traffic flow, and subsequently, flow begins to become and approaches zero value.Although this small flow according to pipeline length and difference, need arrive pipeline for a long time when pipeline is long.Because the Gas appliance plug that is arranged on pipeline 1 downstream is opened, thus when be full of combustion gas, increase with the pressure reduction of second side of utensil plug, and flow begins gradually to increase and turns back to the gas supply state of measurement before cut-out just.When after reset components 28 is opened cut-out parts 27, using the timing piece 29 that resets through scheduled time slots, just will be chosen as the object of leak judgement, carry out leak judgement through the flow of measuring after the scheduled time slot but be to use by the flow that flow rate detection parts 17 detect.In this case, fuel gas shutoff device in each user house and the pipeline length between the Gas appliance are different.Though a large amount of traffic flow after stopper is opened, pressure reduction up to the upstream of the cut-out parts 27 in pipeline 1, but when not removing for some reason when cutting off cause and when opening the utensil plug, carrying out reset operation subsequently, a large amount of traffic flow and subsequently stability of flow near zero small value.Whether the flow judging part 33 judgements stable tiny flow quantity after relatively large traffic flow that resets is equal to or greater than the predetermined value about each user house.When this tiny flow quantity is equal to or greater than predetermined value, possibility of judge to exist leaking, and the flow judging part 33 that resets do not judge wherein combustion gas can with reset operation whether finish but continuation leak judgement.

When use resets after flow judging part 33 detects predetermined tiny flow quantity, leak judgement parts 29 judge based on the changes in flow rate gradient whether gas flow is increased to predetermined amount of flow, wherein by using flow rate detection parts 17 to detect flow velocity, and use traffic calculating unit 25 is converted into flow, obtains described gas flow.Leak judgement parts 29 judge whether the changes in flow rate gradient of use traffic variation judging part 34 detections has reached the leakage flow value in scheduled time slot.Though a large amount of traffic flow makes the pressure in the pipeline 1 become the value identical with upstream pressure, and flow becomes the value near zero, and when opening stopper in the downstream, flow is non-vanishing, but continues to flow near zero tiny flow quantity.When this small flow continued stably to flow scheduled time slot, flow began to increase, and final, and the initial flow of measuring when opening the utensil plug flows through.When leakage is inferred that parts 35 judge that flows are increased to the predetermined amount of flow value or during greater than the changes in flow rate gradient, judged to have gas leakage, and once more shutoff signal is outputed to and cut off parts 27 with the stop supplies combustion gas.In other words, owing to whether removed the cut-out cause by using 17 detections of flow rate detection parts whether to have gas-flow to judge, even when also not judging the existence leakage mistakenly when parts 27 make it to open and detect the transition state that is full of combustion gas in the pipeline, therefore can judge whether there is leakage at short notice simultaneously by driving to cut off.When the state that is detected is just often, that is, when not detecting gas flow, judge and removed the cut-out cause, and open flow path 1, thereby Gas appliance is returned to normal operating condition.

Therefore, do not rely on the variation of flow in the pipeline and do not rely on pipeline length in each user house, whether whether the flow velocity signal judgement of use flow rate detection parts 17 exists gas leakage detect abnormality between the operating period of Gas appliance after, and judge and use reset components 28 to recover cut-out parts 27.Therefore, can judge at short notice and can reuse this Gas appliance.In addition, when cutting off owing to unusual big flow, aggregate flow or service time, wrong judgement was carried out in cut-out, can differentiate the removal of cutting off cause or original pipe close of not closed Gas appliance fully at short notice.Therefore, can improve the convenience and the security of use.

(the 5th embodiment)

Fig. 5 shows the fuel gas shutoff device according to fifth embodiment of the invention.Reference numeral 17 expression flow rate detection parts, it sends ultrasonic signal between upstream oscillator 18 and downstream oscillator 19, and based on it transmission time and detect the flow velocity that uses combustion gas, upstream oscillator 18 and downstream oscillator 19 relatively are installed in the flow path 1 of combustion gas medium of town gas for example or LPG.For example, flow rate detection parts 17 can followingly be constructed.Concrete, flow rate detection parts 17 comprise switching Returning part 20, send Returning part 21, receive Returning part 22, repeat Returning part 23 and transmission time measurement Returning part 24.Send Returning part 21 and receive Returning part 22 and be connected to switching Returning part 20.Switching Returning part 20 alternately changes to send between Returning part 21 and the reception Returning part 22 and connects the destination, thereby will send Returning part 21 and receive Returning part 22 and be connected respectively to upstream oscillator 18 and downstream oscillator 19, and subsequently, send Returning part 21 and be connected respectively to downstream oscillator 19 and upstream oscillator 18 with reception Returning part 22.When use to switch Returning part 20 will receive Returning part 22 be connected to upstream oscillator 18, when sending Returning part 21 and be connected to downstream oscillator 19 simultaneously, transmit by flow path from upstream oscillator 18 from the ultrasonic signal that sends Returning part 21 transmissions, and receive reception Returning part 22 from downstream oscillator 19 subsequently.Repeat Returning part 23 and repeat this transmission/reception of ultrasonic signal, and use transmission time measurement Returning part 24 to repeat the measurement of this signal transmission time therebetween.Transmission time measurement Returning part 24 is measured and accumulation receives the shared time from sending to of this ultrasonic signal.Subsequently, be connected respectively to downstream oscillator 19 and upstream oscillator 18, repeat aforementioned operation by using switching Returning part 20 will receive Returning part 22 and sending Returning part 21.Transmission time measurement Returning part 24 obtains switching the transmission time difference that Returning part 20 switches between the signal transmission time of measuring the destination in the transmission time that obtains by initial received ultrasonic signal and by using.

Reference numeral 25 expression flow rate calculation parts, it is by switching the amount that the transmission time that is obtained obtains working medium, i.e. gas flow.Reference numeral 26 expression abnormality juding parts, the combustion gas use amount that it obtains based on use traffic calculating unit 25 and judge whether there is unusual user mode.For example, there is unusual user mode in order to monitor, abnormality juding parts 26 storage aggregate flow cut-out values or cut-out service time table, aggregate flow cut-out value is used for detecting the unusual a large amount of flow that is produced when the flexible pipe of having removed for some reason to using appliance (for example stove) supply combustion gas, cut-out service time table defines the pot life, this pot life is somebody's turn to do the maximum service time that be longer than common this utensil of use than the long time corresponding to the situation of using this utensil long period.Parts 27 are cut off in Reference numeral 27 expressions, and it is exported shutoff signal and cut off combustion gas path 1 when there is abnormality in 26 judgements of abnormality juding parts.Reference numeral 28 expression reset units, it uses reset instruction that detections such as switch send number and drives shearing device opens flow path, and described reset instruction is used to open owing to abnormality is cut off the flow path that parts 27 close and makes the combustion gas medium available once more.The Reference numeral 29 expression timing piece that resets, it carries out timing the action of reset components 28 after, and stops therebetween and will use flow rate detection parts 17 detect and use traffic calculating unit 25 obtains the flow object as the judgement leakage.Reference numeral 130 expression pressure detecting parts, the pressure in its signal piping.Reference numeral 131 expression pressure are set Returning part, and it sets the pressure that is used to stop using utensil in the pipeline, i.e. blockage pressure.Reference numeral 132 expression pressure judging parts, its will reset back working pressure detection part 130 pressure that detects and pressure of setting in the Returning part 131 at pressure compare, and judge whether measured pressure is equal to or greater than blockage pressure after carrying out reset operation and having passed through the time of the timing piece that resets subsequently.Reference numeral 133 expression leak judgement parts, it judges whether pressure is equal to or greater than blockage pressure, wherein said pressure cuts off parts 27 by using reset components 28 to open, working pressure detection part 130 detected pressures and working pressure judging part 132 judge that these pressure obtain passed through scheduled time slot by the timing piece 29 that resets after, if and this pressure is not to be equal to or greater than blockage pressure, leak judgement parts 133 are judged the existence leakage, thereby the output shutoff signal is to cutting off parts 27.Reference numeral 134 expression report Returning parts when it judges that when abnormality juding parts 26 existing unusual combustion gas user mode also to drive cuts off parts 27, show the interior perhaps state of rupturing operation, and by report gas safe Surveillance center such as telephone wires.

Below, with the operation of explanation said structure parts.After the fuel gas shutoff device is installed, use the user mode of the Fluid Volume monitoring Gas appliance that detects by flow detection Returning part 17.When in the user house, using for a long time the Gas appliance of gas furnace for example or water heater unusually or when removing gas hose for some reason, leaking combustion gas unusually, cut off the supply of combustion gas owing to the unusual user mode of Gas appliance.Whether abnormality juding parts 26 are long unusually by judging the transmission time of using flow rate detection parts 17 to detect, judge and use gas quantity whether in the normal discharge scope or be not unusually greater than the flow value of predetermined value, the flow value that uses gas quantity promptly to be to use flow rate calculation parts 25 to convert from flow speed value.Now, will the exemplary operations of flow rate detection parts 17 be described.

Be installed between upstream oscillator 18 in the flow path 1 (that is fuel gas pipeline) and the downstream oscillator 19 in inclination and send and received ultrasonic signal.Use to switch Returning part 20 and will send Returning part 21 and be connected to upstream oscillator 18, be connected to downstream oscillator 19, pass through the signal of downstream oscillator 19 from upstream oscillator 18 thereby receive by what send Returning part 21 transmissions and will receive Returning part 22.Carry out this operation with the pre-determined number that repeats Returning part 23 settings, to constitute so-called single loop system.Transmission time measurement Returning part 24 obtains to receive by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22 by accumulation.

Subsequently, use and switch Returning part 20, will send Returning part 21 and be connected to downstream oscillator 19, be connected to upstream oscillator 18 and will receive Returning part 22.Ultrasonic signal is exported from sending Returning part 21, and is received by the reception Returning part 22 that is connected to upstream oscillator 18 by downstream oscillator 19 and flow path 1.Similar to above-mentioned explanation, to carry out this operation with the same number of times that repeats Returning part 23 settings.Transmission time measurement Returning part 24 is by accumulation, acquisition receives by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22, and transmission time measurement Returning part 24 obtains in the transmission time that takies when the upstream sends to the downstream when ultrasonic signal and sends to transmission time difference between transmission time of upstream from the downstream.Subsequently, in the transmission time that flow rate calculation parts 25 will be obtained by transmission time measurement Returning part 24, promptly flow speed value V is converted to flow value Q.In Fig. 5, Reference numeral A represents the flow direction of combustion gas medium.

When abnormality juding parts 26 were judged the Traffic Anomaly that is obtained, shutoff signal outputs to cut off parts 27.Thereby, drive and cut off parts 27, and close flow path 1 to stop gas supply.In addition, when the output shutoff signal, the content of this cut-out is presented on the report Returning part 134.When having removed this cut-out cause, for example, when having reinstalled the flexible pipe of wrong installation, reset components 28 actions, and drive cut-out parts 27, open flow path.Subsequently, by reference flow, differentiate Gas appliance user or gas supply person and whether removed this cut-out cause fully.When owing to unusual a large amount of flow cuts off combustion gas (promptly, aggregate flow cuts off) time, when correcting a mistake the gas hose of installing and when cut off owing to the long-time use of the Gas appliance of for example stove combustion gas (, cut off service time) time, the combustion gas that remains in the pipeline is discharged naturally, up to having removed the cut-out cause, for example up to the pipe close of having closed Gas appliance.Just opened after the stopper, in the downstream of shutoff valve, had pressure reduction.Therefore, a large amount of flows flow through, and reach supply pressure up to lowered gaseous-pressure in the pipeline of downstream.When pressure after that becomes when even, the flow speed value vanishing that detects by pressure detecting part 130 or near zero value.Yet when reset components 28 actions were cut off parts 27 to open under the situation of not removing the cut-out cause for some reason, traffic flow, and the gaseous-pressure in the pipeline in a large number were increased to and approach blockage pressure.Yet, open owing to be arranged on the Gas appliance plug in pipeline 1 downstream, so even all be full of combustion gas, flow still increases and turn back to the pressure (that is controlled pressure) of firm utensil operating period measurements before cutting off gradually.When after reset components 28 is opened cut-out parts 27, using the timing piece 29 that resets through scheduled time slots, just will carry out leak judgement but be to use through the flow of measuring after the scheduled time slot by the flow of flow rate detection parts 17 or pressure detecting part 130 detections or the object that pressure is chosen as leak judgement.The pressure that is provided with of through working pressure detection part 130 detected pressures behind the scheduled time slots and working pressure judging part 132 pressure that detected and pressure being set Returning part 131 by the timing piece 29 of resetting in use compares, and whether leak judgement parts 133 bases have predetermined pressure is determined decision signal.Pressure is set Returning part 131 and is had the blockage pressure that is used to stop utensil.When detecting the pressure that is equal to or less than blockage pressure, there is gas leakage in 33 judgements of leak judgement parts, and shutoff signal is outputed to cut-out parts 27 with the stop supplies combustion gas.In other words, because whether slight being reduced to judges whether removed the cut-out cause under the blockage pressure to detect gaseous-pressure by working pressure detection part 130, the wherein slight gaseous-pressure that is reduced under the blockage pressure is not considered to the pressure reduction and is not equal to blockage pressure yet, even when also not judging the existence leakage mistakenly when parts 27 make it to open and detect the transition state that is full of combustion gas in the pipeline, therefore can judge whether there is leakage at short notice simultaneously by driving to cut off.If the state that is detected is just often, that is, when not detecting gas flow, judges and removed the cut-out cause, and open flow path 1, thereby Gas appliance is returned to normal operating condition.

Therefore, do not rely on the variation of flow in the pipeline, judge whether there is gas leakage after between the operating period of Gas appliance, detecting abnormality according to the pressure signal of pressure detecting part 130, and whether judgement uses reset components 28 to recover cut-out parts 27.Therefore, can judge at short notice and can reuse this Gas appliance.In addition, do not reduce state and do not carry out the lasting problem of leakage that rupturing operation causes owing to when having micro-gas leakage, it not being considered as combustion gas even can prevent.Therefore, when cutting off owing to unusual big flow, aggregate flow or service time, wrong judgement was carried out in cut-out, can differentiate the removal of cutting off cause or original pipe close of not closed Gas appliance fully at short notice, can not judge mistakenly simultaneously that the pressure (that is controlled pressure) during the filling combustion gas is for leaking in pipeline.Therefore, can improve the convenience and the security of use.

(the 6th embodiment)

Fig. 6 shows the fuel gas shutoff device according to sixth embodiment of the invention.In Fig. 6, identical Reference numeral represent with Fig. 5,7,8 and 9 those have the similar elements of said function, and omitted their explanation.

In Fig. 6, Reference numeral 135 expression pressure memory units, it (that is, is kept off in zero the time when the flow that is detected by flow rate detection parts 17 at utensil between the operating period, detect the utensil flow) detect the pressure (that is controlled pressure) that detects by pressure detecting part 130 and store its maximum.Though do not illustrate in the accompanying drawing, periodically remove, detect and store once more subsequently maximum.

Then, will the operation of said structure parts be described.After the fuel gas shutoff device is installed, use the user mode of the traffic monitoring Gas appliance that detects by flow rate detection parts 17.When in the user house, using for a long time the Gas appliance of gas furnace for example or water heater unusually or when removing gas hose for some reason, leaking combustion gas unusually, cut off the supply of combustion gas owing to the unusual user mode of Gas appliance.Whether abnormality juding parts 26 are long unusually by judging the transmission time of using flow rate detection parts 17 to detect, judge and use gas quantity whether in the normal discharge scope or be not unusually greater than the flow value of predetermined value, the flow value that uses gas quantity promptly to be to use flow rate calculation parts 25 to convert from flow speed value.Now, will the exemplary operations of flow rate detection parts 17 be described.

Be installed between upstream oscillator 18 in the flow path 1 (that is fuel gas pipeline) and the downstream oscillator 19 in inclination and send and received ultrasonic signal.Use to switch Returning part 20 and will send Returning part 21 and be connected to upstream oscillator 18, be connected to downstream oscillator 19, pass through the signal of downstream oscillator 19 from upstream oscillator 18 thereby receive by what send Returning part 21 transmissions and will receive Returning part 22.Carry out this operation with the pre-determined number that repeats Returning part 23 settings, to constitute so-called single loop system.Transmission time measurement Returning part 24 obtains to receive by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22 by accumulation.

Subsequently, use and switch Returning part 20, will send Returning part 21 and be connected to downstream oscillator 19, be connected to upstream oscillator 18 and will receive Returning part 22.Ultrasonic signal is exported from sending Returning part 21, and is received by the reception Returning part 22 that is connected to upstream oscillator 18 by downstream oscillator 19 and flow path 1.Similar to above-mentioned explanation, to carry out this operation with the same number of times that repeats Returning part 23 settings.Transmission time measurement Returning part 24 is by accumulation, acquisition receives by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22, and transmission time measurement Returning part 24 obtains in the transmission time that takies when the upstream sends to the downstream when ultrasonic signal and sends to transmission time difference between transmission time of upstream from the downstream.Subsequently, in the transmission time that flow rate calculation parts 25 will be obtained by transmission time measurement Returning part 19, promptly flow speed value V is converted to flow value Q.In Fig. 5, Reference numeral A represents the flow direction of combustion gas medium.In addition, when using flow rate detection parts 17 to detect the utensil flow, pressure detecting part 130 detects supply pressure (that is controlled pressure) and its maximum of storage in pressure memory unit 135.The historical record of the maximum supply pressure of pressure memory unit 135 storages.

When abnormality juding parts 26 were judged the Traffic Anomaly that is obtained, shutoff signal outputs to cut off parts 27.Thereby, drive and cut off parts 27, and close flow path 1 to stop gas supply.In addition, when the output shutoff signal, the content of this cut-out is presented on the report Returning part 134.When having removed this cut-out cause, for example, when having reinstalled the flexible pipe of wrong installation, reset components 28 actions, and drive cut-out parts 27, open flow path.Subsequently, by reference flow, differentiate Gas appliance user or gas supply person and whether removed this cut-out cause fully.When owing to unusual a large amount of flow cuts off combustion gas (promptly, aggregate flow cuts off) time, when correcting a mistake the gas hose of installing or when cut off owing to the long-time use of the Gas appliance of for example stove combustion gas (, cut off service time) time, the combustion gas that remains in the pipeline is discharged naturally, up to having removed the cut-out cause, for example up to the pipe close of having closed Gas appliance.Just opened after the stopper, in the downstream of shutoff valve, had pressure reduction.Therefore, a large amount of flows flow through, and reach supply pressure up to lowered gaseous-pressure in the pipeline of downstream.When pressure after that becomes when even, the flow speed value that is detected by flow rate detection parts 17 becomes and approaches blockage pressure, i.e. the force value of measurement when utensil stops.Yet when reset components 28 actions were cut off parts 27 to open under the situation of not removing the cut-out cause for some reason, traffic flow, and the gaseous-pressure in the pipeline in a large number were increased to and approach blockage pressure.Yet, open owing to be arranged on the Gas appliance plug in pipeline 1 downstream, so even all be full of combustion gas, flow still increases and turn back to the gas supply state (that is controlled pressure) of firm utensil operating period measurements before cutting off gradually.When after reset components 28 is opened cut-out parts 27, using the timing piece 29 that resets through scheduled time slots, just the object that will be chosen as leak judgement by the flow or the pressure of flow rate detection parts 17 detections is being carried out leak judgement but be to use through the flow of measuring after the scheduled time slot.Pressure judging part 132 compares pressure that working pressure detection part 17 detects after by the scheduled time slot of timing piece 29 processes that reset and the maximum that is stored in the controlled pressure in the pressure memory unit 135.Leak judgement parts 133 are according to using by predetermined pressure being added to whether the pressure that value that maximum controlled pressure obtains detects is the high decision signal of determining.Because pressure memory unit 135 has been stored at utensil and used the supply pressure of measuring in the scheduled time slot, that is, the maximum of controlled pressure is so can be identified in the pressure of utensil operating period measurements definitely.When pressure was equal to or less than the maximum controlled pressure of being stored, there was gas leakage in 133 judgements of leak judgement parts, and shutoff signal is outputed to cut-out parts 27 with the stop supplies combustion gas.In other words, because whether detect gaseous-pressures by working pressure detection part 130 is reduced to blockage pressure slightly or lowlyer judges whether removed the cut-out cause, the gaseous-pressure that wherein is reduced to slightly under the blockage pressure is not considered to the pressure reduction and is not equal to blockage pressure yet, even also not judging mistakenly to exist simultaneously leaks, so can judge whether there is leakage at short notice when making it to open and detect the transition state that is full of combustion gas in the pipeline by driving cut-out parts 27.If the state that is detected is just often, that is, when not detecting gas flow, judges and removed the cut-out cause, and open flow path 1, thereby Gas appliance is returned to normal operating condition.

Therefore, do not rely on the variation of flow in the pipeline, judge whether there is gas leakage after between the operating period of Gas appliance, detecting abnormality according to the pressure signal of pressure detecting part 130, and whether judgement uses reset components 28 to recover cut-out parts 27.Therefore, can judge at short notice and can reuse this Gas appliance.In addition, do not reduce state and do not carry out the lasting problem of leakage that rupturing operation causes owing to when having micro-gas leakage, it not being considered as combustion gas even can prevent.Therefore, when cutting off owing to unusual big flow, aggregate flow or service time, wrong judgement was carried out in cut-out, can differentiate the removal of cutting off cause or original pipe close of not closed Gas appliance fully at short notice, can not judge mistakenly simultaneously that the pressure (that is controlled pressure) during the filling combustion gas is for leaking in pipeline.Therefore, can improve the convenience and the security of use.

(the 7th embodiment)

Fig. 7 shows the fuel gas shutoff device according to seventh embodiment of the invention.In Fig. 7, identical Reference numeral represent with Fig. 5,6,8 and 9 those have the similar elements of said function, and omitted their explanation.

In Fig. 7, Reference numeral 136 expression pressure change judging part, and it obtains the pressure variable gradient based on the pressure that is detected by pressure detecting part 130, and judges whether pressure is reduced to controlled pressure from blockage pressure.Whether Reference numeral 137 expression is leaked and is inferred parts, and its working pressure changes judging part 136 and detects negative pressure variation gradients, and infer corresponding to the pressure of variable gradient and set by pressure under the blockage pressure that Returning part 131 sets.When inferring pressure corresponding to variable gradient under blockage pressure the time, the output shutoff signal.

Then, will the operation of said structure parts be described.After the fuel gas shutoff device is installed, use the user mode of the traffic monitoring Gas appliance that detects by flow rate detection parts 17.When in the user house, using for a long time the Gas appliance of gas furnace for example or water heater unusually or when removing gas hose for some reason, leaking combustion gas unusually, cut off the supply of combustion gas owing to the unusual user mode of Gas appliance.Whether abnormality juding parts 26 are long unusually by judging the transmission time of using flow rate detection parts 17 to detect, judge and use gas quantity whether in the normal discharge scope or be not unusually greater than the flow value of predetermined value, the flow value that uses gas quantity promptly to be to use flow rate calculation parts 25 to convert from flow speed value.Now, will the exemplary operations of flow rate detection parts 17 be described.

Be installed between upstream oscillator 18 in the flow path 1 (that is fuel gas pipeline) and the downstream oscillator 19 in inclination and send and received ultrasonic signal.Use to switch Returning part 20 and will send Returning part 21 and be connected to upstream oscillator 18, be connected to downstream oscillator 19, pass through the signal of downstream oscillator 19 from upstream oscillator 18 thereby receive by what send Returning part 21 transmissions and will receive Returning part 22.Carry out this operation with the pre-determined number that repeats Returning part 23 settings, to constitute so-called single loop system.Transmission time measurement Returning part 24 obtains to receive by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22 by accumulation.

Subsequently, use and switch Returning part 20, will send Returning part 21 and be connected to downstream oscillator 19, be connected to upstream oscillator 18 and will receive Returning part 22.Ultrasonic signal is exported from sending Returning part 21, and is received by the reception Returning part 22 that is connected to upstream oscillator 18 by downstream oscillator 19 and flow path 1.Similar to above-mentioned explanation, to carry out this operation with the same number of times that repeats Returning part 23 settings.Transmission time measurement Returning part 24 is by accumulation, acquisition receives by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22, and transmission time measurement Returning part 24 obtains in the transmission time that takies when the upstream sends to the downstream when ultrasonic signal and sends to transmission time difference between transmission time of upstream from the downstream.Subsequently, in the transmission time that flow rate calculation parts 25 will be obtained by transmission time measurement Returning part 19, promptly flow speed value V is converted to flow value Q.In Fig. 5, Reference numeral A represents the flow direction of combustion gas medium wherein.

When abnormality juding parts 26 were judged the Traffic Anomaly that is obtained, shutoff signal outputs to cut off parts 27.Thereby, drive and cut off parts 27, and close flow path 1 to stop gas supply.In addition, when the output shutoff signal, the content of this cut-out is presented on the report Returning part 134.When having removed this cut-out cause, for example, when having reinstalled the flexible pipe of wrong installation, reset components 28 actions, and drive cut-out parts 27, open flow path.Subsequently, by reference flow, differentiate Gas appliance user or gas supply person and whether removed this cut-out cause fully.When owing to unusual a large amount of flow cuts off combustion gas (promptly, aggregate flow cuts off) time, when correcting a mistake the gas hose of installing or when cut off owing to the long-time use of the Gas appliance of for example stove combustion gas (, cut off service time) time, the combustion gas that remains in the pipeline is discharged naturally, up to having removed the cut-out cause, for example up to the pipe close of having closed Gas appliance.Just opened after the stopper, in the downstream of shutoff valve, had pressure reduction.Therefore, a large amount of flows flow through, and reach supply pressure up to lowered gaseous-pressure in the pipeline of downstream.When pressure after that becomes when even, the flow speed value that is detected by flow rate detection parts 17 becomes and approaches blockage pressure, i.e. the force value of measurement when utensil stops.Yet when reset components 28 direct actions were cut off parts 27 to open under the situation of not removing the cut-out cause for some reason, traffic flow, and the gaseous-pressure in the pipeline in a large number were increased to and approach blockage pressure.Yet, open owing to be arranged on the Gas appliance plug in pipeline 1 downstream, so even all be full of combustion gas, flow still increases and turn back to the gas supply state (that is controlled pressure) of firm utensil operating period measurements before cutting off gradually.When after reset components 28 is opened cut-out parts 27, using the timing piece 29 that resets through scheduled time slots, just the object that will be chosen as leak judgement by the flow or the pressure of flow rate detection parts 17 detections is being carried out leak judgement but be to use through the flow of measuring after the scheduled time slot.Pressure detecting part 17 detects the pressure that changes after by the timing piece 29 process scheduled time slots that reset, and pressure changes judging part 136 acquisition pressure variable gradients.Leak if exist, force value has the trend that reduces from the blockage pressure to the controlled pressure so.Pressure is set the blockage pressure that Returning part 131 is set the time point that stops when utensil.If detect pressure variable gradient and changing value, leak judgement parts 133 are inferred the reduction value of pressure so.Be reduced to blockage pressure or lower if infer through pressure after the scheduled time slot, judging so to have gas leakage, and once more shutoff signal is being outputed to cut-out parts 27 with the stop supplies combustion gas.In other words, owing to detect whether slight being reduced to blockage pressure or lowlyer judging whether removed the cut-out cause of gaseous-pressures by working pressure detection part 130, the gaseous-pressure that wherein is reduced to slightly under the blockage pressure is not considered to the pressure reduction and is not equal to blockage pressure yet, even when also not judging the existence leakage mistakenly when parts 27 make it to open and detect the transition state that is full of combustion gas in the pipeline, therefore can judge whether there is leakage at short notice simultaneously by driving to cut off.If the state that is detected is just often, that is, when not detecting gas flow, judges and removed the cut-out cause, and open flow path 1, thereby Gas appliance is returned to normal operating condition.

Therefore, do not rely on the variation of flow in the pipeline, judge whether there is gas leakage after between the operating period of Gas appliance, detecting abnormality according to the pressure signal of pressure detecting part 130, and whether judgement uses reset components 28 to recover cut-out parts 27.Therefore, can judge at short notice and can reuse this Gas appliance.In addition, do not reduce state and do not carry out the lasting problem of leakage that rupturing operation causes owing to when having micro-gas leakage, it not being considered as combustion gas even can prevent.Therefore, when cutting off owing to unusual big flow, aggregate flow or service time, wrong judgement was carried out in cut-out, can differentiate the removal of cutting off cause or original pipe close of not closed Gas appliance fully at short notice, can not judge mistakenly simultaneously that the pressure (that is controlled pressure) during the filling combustion gas is for leaking in pipeline.Therefore, can improve the convenience and the security of use.

(the 8th embodiment)

Fig. 8 shows the fuel gas shutoff device according to eighth embodiment of the invention.In Fig. 8, identical Reference numeral represent with Fig. 5,6,7 and 9 those have the similar elements of said function, and omitted their explanation.

In Fig. 8, Reference numeral 138 expression leak judgement parts.Recover to cut off parts 27 based on reset components 28 and by the timing piece 29 that resets through after the scheduled time slots, judge whether flow signal from flow rate detection parts 17 is equal to or greater than predetermined value or blockage pressure that the pressure that will be detected by pressure detecting part 130 and pressure are set Returning part 131 sets value and compare.One of being defined as in the lower signal is chosen as the leak judgement signal, and shutoff signal outputed to cuts off parts 27, thereby judge that it is not in the gas supply state.

Then, will the operation of said structure parts be described.After the fuel gas shutoff device is installed, use the user mode of the traffic monitoring Gas appliance that detects by flow rate detection parts 17.When in the user house, using for a long time the Gas appliance of gas furnace for example or water heater unusually or when removing gas hose for some reason, leaking combustion gas unusually, cut off the supply of combustion gas owing to the unusual user mode of Gas appliance.Whether abnormality juding parts 26 are long unusually by judging the transmission time of using flow rate detection parts 17 to detect, judge and use gas quantity whether in the normal discharge scope or be not unusually greater than the flow value of predetermined value, the flow value that uses gas quantity promptly to be to use flow rate calculation parts 25 to convert from flow speed value.Now, will the exemplary operations of flow rate detection parts 17 be described.

Be installed between upstream oscillator 18 in the flow path 1 (that is fuel gas pipeline) and the downstream oscillator 19 in inclination and send and received ultrasonic signal.Use to switch Returning part 20 and will send Returning part 21 and be connected to upstream oscillator 18, be connected to downstream oscillator 19, pass through the signal of downstream oscillator 19 from upstream oscillator 18 thereby receive by what send Returning part 21 transmissions and will receive Returning part 22.Carry out this operation with the pre-determined number that repeats Returning part 23 settings, to constitute so-called single loop system.Transmission time measurement Returning part 24 obtains to receive by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22 by accumulation.

Subsequently, use and switch Returning part 20, will send Returning part 21 and be connected to downstream oscillator 19, be connected to upstream oscillator 18 and will receive Returning part 22.Ultrasonic signal is exported from sending Returning part 21, and is received by the reception Returning part 22 that is connected to upstream oscillator 18 by downstream oscillator 19 and flow path 1.Similar to above-mentioned explanation, to carry out this operation with the same number of times that repeats Returning part 23 settings.Transmission time measurement Returning part 24 is by accumulation, acquisition receives by sending the used transmission time of ultrasonic signal that Returning part 21 sends up to receiving Returning part 22, and transmission time measurement Returning part 24 obtains in the transmission time that takies when the upstream sends to the downstream when ultrasonic signal and sends to transmission time difference between transmission time of upstream from the downstream.Subsequently, in the transmission time that flow rate calculation parts 25 will be obtained by transmission time measurement Returning part 19, promptly flow speed value V is converted to flow value Q.In Fig. 5, Reference numeral A represents the flow direction of combustion gas medium.In addition, when using flow rate detection parts 17 to detect the utensil flow, pressure detecting part 130 detects supply pressure (that is controlled pressure) and its maximum of storage in pressure memory unit 135.The historical record of the maximum supply pressure of pressure memory unit 135 storages.

When abnormality juding parts 26 were judged the Traffic Anomaly that is obtained, shutoff signal outputs to cut off parts 27.Thereby, drive and cut off parts 27, and close flow path 1 to stop gas supply.In addition, when the output shutoff signal, the content of this cut-out is presented on the report Returning part 134.When having removed this cut-out cause, for example, when having reinstalled the flexible pipe of wrong installation, reset components 28 actions, and drive cut-out parts 27, open flow path.Subsequently, by reference flow, differentiate Gas appliance user or gas supply person and whether removed this cut-out cause fully.When owing to unusual a large amount of flow cuts off combustion gas (promptly, aggregate flow cuts off) time, when correcting a mistake the gas hose of installing or when cut off owing to the long-time use of the Gas appliance of for example stove combustion gas (, cut off service time) time, the combustion gas that remains in the pipeline is discharged naturally, up to having removed the cut-out cause, for example up to the pipe close of having closed Gas appliance.Just opened after the stopper, in the downstream of shutoff valve, had pressure reduction.Therefore, a large amount of flows flow through, and reach supply pressure up to lowered gaseous-pressure in the pipeline of downstream.When pressure after that becomes when even, the flow speed value that is detected by flow rate detection parts 17 becomes and approaches blockage pressure, i.e. force value when utensil stops.Yet when reset components 28 direct actions were cut off parts 27 to open under the situation of not removing the cut-out cause for some reason, traffic flow, and the gaseous-pressure in the pipeline in a large number were increased to and approach blockage pressure.Yet, open owing to be arranged on the Gas appliance plug in pipeline 1 downstream, so even all be full of combustion gas, flow still increases and turn back to the gas supply state (that is controlled pressure) of firm utensil operating period measurements before cutting off gradually.When after reset components 28 is opened cut-out parts 27, using the timing piece 29 that resets through scheduled time slots, flow that will detect by flow rate detection parts 17 or the pressure object that be chosen as leak judgement, but be to use through the flow measured after the scheduled time slot have predetermined amount of flow or the flow signal of bigger flow in junior one execution leak judgement.Pressure detecting part 17 detects the pressure that changes after by the timing piece 29 process scheduled time slots that reset, and pressure judging part 132 compares itself and the maximum that is stored in the controlled pressure in the pressure memory unit 135.Leak judgement parts 133 are according to using by predetermined pressure being added to whether the pressure that value that maximum controlled pressure obtains detects is the high decision signal of determining.Because pressure memory unit 135 has been stored at utensil and used the supply pressure of measuring in the scheduled time slot, that is, the maximum of controlled pressure is so can be identified in the pressure of utensil between the operating period definitely.On the other hand, use traffic detects Returning part 17 and detects flow, and the leakage flow value is increased to predetermined amount of flow gradually.When pressure is equal to or less than the maximum controlled pressure stored or the junior one and has the signal of flow of the predetermined amount of flow of being equal to or greater than, preferential leak judgement parts 138 are judged the existence leakage, and shutoff signal is outputed to cut-out parts 27 with the stop supplies combustion gas.In other words, whether be reduced to blockage pressure or lower slightly owing to detect gaseous-pressure by working pressure detection part 130, perhaps detect the signal that the junior one has the flow that increases gradually when after being full of combustion gas in the pipeline, not closing the utensil plug and judge whether removed the cut-out cause, the gaseous-pressure that wherein is reduced to slightly under the blockage pressure is not considered to the pressure reduction and is not equal to blockage pressure yet, even when also not judging the existence leakage mistakenly when parts 27 make it to open and detect the transition state that is full of combustion gas in the pipeline, therefore can judge whether there is leakage at short notice simultaneously by driving to cut off.If the state that is detected is just often, that is, when not detecting gas flow, judges and removed the cut-out cause, and open flow path 1, thereby Gas appliance is returned to normal operating condition.

Therefore, do not rely on the variation of flow in the pipeline, judge whether there is gas leakage after between the operating period of Gas appliance, detecting abnormality according to the pressure signal of pressure detecting part 130, and whether judgement uses reset components 28 to recover cut-out parts 27.Therefore, can judge at short notice and can reuse this Gas appliance.In addition, even owing to preventing that it not being considered as combustion gas when having micro-gas leakage reduces state and do not carry out the lasting problem of leakage that rupturing operation causes.Therefore, when carrying out the aggregate flow cut-out or cutting off service time, can differentiate the removal of cutting off cause or original pipe close of not closed Gas appliance fully at short notice, can not judge that the pressure (that is controlled pressure) during the filling combustion gas is for leaking in pipeline simultaneously mistakenly.Because working pressure detection part 130 and flow rate detection parts 17 are carried out leak judgement, so can improve practicality, security and reliability.

[commercial Application]

As mentioned above, fuel gas shutoff device according to the present invention can be applied to use sensor measurement to flow through the various combustion gas of pipeline, for example LP gas, town gas and hydrogen, described sensor for example is film-type, ultrasonic type, heat type and fluidic sensor, and it can also be applied to use ultrasonic sensor etc. to measure for example water measurement of the liquid of water.

Though with reference to description of drawings the present invention, under situation about not departing from the scope of the present invention with spirit, can carry out multiple modification or change, this is apparent to those skilled in the art.

The present invention requires the priority of Japanese patent application No.2004-302336 that submitted on October 20th, 2004 and the Japanese patent application No.2004-302337 that submitted on October 20th, 2004, and above-mentioned document all is hereby incorporated by.

Claims (16)

1. fuel gas shutoff device comprises:

The flow rate detection parts, it detects flow velocity by the signal transmission time in the measuring media;

The flow rate calculation parts, it will be converted to flow by the flow velocity that the flow rate detection parts detect;

The abnormality juding parts, whether its judgement is normal by the use traffic of flow rate calculation component computes;

Cut off parts, it is judged at the abnormality juding parts and exists when unusual, cuts off the flow path that MEDIA FLOW is crossed;

Reset components, its output reset signal is given and is cut off parts to open flow path;

The timing piece that resets, it is based on the reset operation of reset components and pick up counting; With

The leak judgement parts, when it measured predetermined amount of flow or bigger flow at reset timing piece counting process scheduled time slot and flow rate calculation parts, output drive signal was given and is cut off parts to cut off flow path.

2. according to the fuel gas shutoff device of claim 1, further comprise the judging part that resets, it judges the flow that detected by the flow rate calculation parts whether within predetermined amount of flow resetting after, and the reset decision content of timing piece of change.

3. according to the fuel gas shutoff device of claim 1, further comprise the flow judging part that resets, it judges whether the flow that is detected by the flow rate calculation parts is equal to or greater than predetermined value when resetting timing piece counting process scheduled time slot,

Wherein, when the flow judging part that resets judges that flow is equal to or greater than predetermined amount of flow, the leak judgement parts judge whether flow value is increased to predetermined value after judging timing, and subsequently when judging that flow reaches predetermined amount of flow or when bigger, judge to exist and leak, and output drive signal gives the cut-out parts to cut off flow path.

4. fuel gas shutoff device comprises:

The flow rate detection parts, it detects flow velocity by the signal transmission time in the measuring media;

The flow rate calculation parts, it will be converted to flow by the flow velocity that the flow rate detection parts detect;

The abnormality juding parts, whether its judgement is normal by the use traffic of flow rate calculation component computes;

Cut off parts, it is judged at the abnormality juding parts and exists when unusual, cuts off flow path;

Reset components, its output reset signal is given and is cut off parts to open flow path;

The timing piece that resets, it is based on the reset operation of reset components and pick up counting;

The flow judging part that resets, it judges whether the flow that is detected by the flow rate calculation parts is equal to or greater than predetermined value after the scheduled time slot that has passed through by the timing piece counting that resets;

The changes in flow rate judging part, when it judges that at the flow judging part that resets flow is equal to or greater than predetermined amount of flow, the calculated flow rate variable gradient; With

Parts are inferred in leakage, and when the changes in flow rate judging part infers in scheduled time slot that changes in flow rate will reach predetermined amount of flow or when bigger, this leakage is inferred parts and judged to exist and leak, and output drive signal is given and cut off parts to cut off flow path.

5. fuel gas shutoff device comprises:

The flow rate detection parts, it detects flow velocity by the signal transmission time in the measuring media;

The flow rate calculation parts, it will be converted to flow by the flow velocity that the flow rate detection parts detect;

The abnormality juding parts, it judges whether the use traffic that is obtained by the flow rate calculation parts is normal;

Cut off parts, it is judged at the abnormality juding parts and exists when unusual, cuts off the flow path that MEDIA FLOW is crossed;

Pressure detecting part, it detects the pressure in the flow path;

The pressure judging part, it judges whether the pressure that is detected by pressure detecting part is equal to or less than predetermined pressure;

Reset components, its output reset signal is given and is cut off parts to open flow path;

The timing piece that resets, it is based on the reset operation of reset components and pick up counting; With

The leak judgement parts, when it judged that at reset timing piece counting process scheduled time slot and pressure judging part the pressure that is detected is equal to or less than predetermined pressure, output drive signal was given and is cut off parts to cut off flow path.

6. according to the fuel gas shutoff device of claim 5, further comprise the pressure memory unit, its pressure that storage is detected by pressure detecting part when utensil uses,

Wherein when the pressure in the flow path that reset timing piece counting process scheduled time slot and judgement are detected by pressure detecting part was equal to or less than the pressure of storing in the pressure memory unit, leak judgement parts output drive signal was given and is cut off parts with the cut-out flow path.

7. fuel gas shutoff device comprises:

The flow rate detection parts, it detects flow velocity by the signal transmission time in the measuring media;

The flow rate calculation parts, it will be converted to flow by the flow velocity that the flow rate detection parts detect;

The abnormality juding parts, whether its judgement is normal by the use traffic of flow rate calculation component computes;

Cut off parts, it is judged at the abnormality juding parts and exists when unusual, cuts off the flow path that MEDIA FLOW is crossed;

Pressure detecting part, it detects the pressure in the flow path;

Reset components, its output reset signal is given and is cut off parts to open flow path;

The timing piece that resets, it is based on the reset operation of reset components and pick up counting;

The pressure memory unit, it stores the fluid pressure that is detected by pressure detecting part when utensil does not use;

Pressure changes judging part, and it determines the pressure variable gradient according to the output signal of pressure detecting part when resetting timing piece counting process scheduled time slot; With

Parts are inferred in leakage, infer to change in the scheduled time slot internal pressure and will reach predetermined pressure or more hour when pressure changes judging part, and this leakage is inferred parts and judged to exist and leak, and output drive signal is given and cut off parts to cut off flow path.

8. fuel gas shutoff device comprises:

The flow rate detection parts, it detects flow velocity by the signal transmission time in the measuring media;

The flow rate calculation parts, it will be converted to flow by the flow velocity that the flow rate detection parts detect;

The abnormality juding parts, whether its judgement is normal by the use traffic of flow rate calculation component computes;

Cut off parts, it is judged at the abnormality juding parts and exists when unusual, cuts off the flow path that MEDIA FLOW is crossed;

Pressure detecting part, it detects the pressure in the flow path;

Reset components, its output reset signal is given and is cut off parts to open flow path;

The timing piece that resets, it is based on the reset operation of reset components and pick up counting;

The pressure memory unit, it stores the fluid pressure that is detected by pressure detecting part when utensil uses;

The pressure judging part, it judges whether the pressure that is detected by pressure detecting part is equal to or less than the pressure that is stored in the pressure memory unit; With

Preferential leak judgement parts, its according in following two decision signals early decision signal and output drive signal is given and is cut off parts to cut off flow path, wherein said two decision signals are, the decision signal of exporting through scheduled time slot and when judging that the flow that is detected by the flow rate detection parts is equal to or greater than predetermined value when the timing piece counting of resetting and compare and detect the decision signal of exporting when this pressure is equal to or less than predetermined pressure when the pressure that will detect by pressure detecting part and the pressure of in memory unit, storing.

9. fuel gas shutoff method comprises:

The flow rate detection step is used for detecting flow velocity by the signal transmission time of measuring media;

The flow rate calculation step, the flow velocity that is used for detecting in the flow rate detection step is converted to flow;

The abnormality juding step is used for judging whether the use traffic of calculating in the flow rate calculation step is normal;

Cut off step, be used for having when unusual the flow path that the cut-out MEDIA FLOW is crossed when judging in the abnormality juding step;

Reset process is used to export reset signal to open flow path;

The timing step that resets is used for picking up counting based on reset signal; With

The leak judgement step is used for cutting off flow path when from picking up counting through scheduled time slot and when the flow that the flow rate calculation step is measured is equal to or greater than predetermined amount of flow.

10. according to the fuel gas shutoff method of claim 9, further comprise:

The flow determination step is used for judging that the flow measured in the flow rate calculation step after resetting is whether within predetermined amount of flow; With

The determination step that resets is used for changing the setting of the scheduled time slot of counting in the timing step that resets.

11. the fuel gas shutoff method according to claim 9 further comprises the flow determination step that resets, and is used for when through scheduled time slot, judges whether the detection flow of measuring in the flow rate calculation step is equal to or greater than predetermined value,

Wherein, when judging in the flow determination step that resetting that flow is equal to or greater than predetermined amount of flow, configuration leak judgement step to be judging whether flow value has been increased to predetermined value after judging timing, when flow has reached predetermined amount of flow or when bigger, judge to exist and leak, and cut off flow path.

12. a fuel gas shutoff method comprises:

The flow rate detection step is used for detecting flow velocity by the signal transmission time of measuring media;

The flow rate calculation step, the flow velocity that is used for detecting in the flow rate detection step is converted to flow;

The abnormality juding step is used for judging whether the use traffic of calculating in the flow rate calculation step is normal;

Cut off step, be used for having when unusual the flow path that the cut-out MEDIA FLOW is crossed when judging in the abnormality juding step;

Reset process is used to export reset signal to open flow path;

The timing step that resets is used for picking up counting based on reset signal;

The flow determination step that resets is used for beginning from timing through after the scheduled time slot, judges whether the detection flow of measuring in the flow rate calculation step is equal to or greater than predetermined value;

The changes in flow rate determination step is used for when when the flow determination step that resets judges that flow is equal to or greater than predetermined amount of flow the calculated flow rate variable gradient; With

Step is inferred in leakage, is used for will reaching predetermined amount of flow or when bigger, judge to exist and leak, and cut off flow path in scheduled time slot when inferring in the determined changes in flow rate of changes in flow rate determination step.

13. a fuel gas shutoff method comprises:

The flow rate detection step is used for detecting flow velocity by the signal transmission time of measuring media;

The flow rate calculation step, the flow velocity that is used for detecting in the flow rate detection step is converted to flow;

The abnormality juding step is used for judging whether the use traffic that obtains in the flow rate calculation step is normal;

Cut off step, be used for having when unusual the flow path that the cut-out MEDIA FLOW is crossed when judging in the abnormality juding step;

The pressure detecting step is used for detecting the pressure of flow path;

The pressure determination step is used for judging whether the pressure that detects in the pressure detecting step is equal to or less than predetermined pressure;

Reset process is used to export reset signal to open flow path;

The timing step that resets is used for based at the reset operation of reset process and pick up counting; With

The leak judgement step, be used for from pick up counting through after the scheduled time slot when the pressure determination step judges that the pressure that is detected is equal to or less than predetermined pressure, the cut-out flow path.

14. the fuel gas shutoff method according to claim 13 further comprises the pressure storing step, is used for when utensil uses, will being stored at the pressure that the pressure detecting step detects in the pressure memory unit,

Wherein, in the leak judgement step, through scheduled time slot and when judging that subsequently the pressure in flow path that detects is equal to or less than the pressure of storing in the pressure memory unit in the pressure detecting step, cut off flow path when.

15. a fuel gas shutoff method comprises:

The flow rate detection step is used for detecting flow velocity by the signal transmission time of measuring media;

The flow rate calculation step, the flow velocity that is used for detecting in the flow rate detection step is converted to flow;

The abnormality juding step is used for judging whether the use traffic of calculating in the flow rate calculation step is normal;

Cut off step, be used for having when unusual the flow path that the cut-out MEDIA FLOW is crossed when judging in the abnormality juding step;

The first pressure detecting step is used for detecting the pressure of flow path;

Reset process is used to export reset signal to open flow path;

The timing step that resets is used for based at the reset operation of reset process and pick up counting;

The second pressure detecting step is used for detecting the pressure of flow path when using appliance not;

The pressure storing step, the pressure that is used for detecting in the second pressure detecting step is stored in the pressure memory unit;

Pressure changes determination step, is used for determining the pressure variable gradient according to the pressure that detects in the first pressure detecting step when through scheduled time slot; With

Step is inferred in leakage, is used for changing will reach predetermined pressure or more hour in scheduled time slot when inferring the pressure that changes determination step at pressure, judges to exist and leaks, and cut off flow path.

16. a fuel gas shutoff method comprises:

The flow rate detection step is used for detecting flow velocity by the signal transmission time of measuring media;

The flow rate calculation step, the flow velocity that is used for detecting in the flow rate detection step is converted to flow;

The abnormality juding step is used for judging whether the use traffic of calculating in the flow rate calculation step is normal;

Cut off step, be used for having when unusual the cut-out flow path when judging in the abnormality juding step;

The first pressure detecting step is used for detecting the pressure of flow path;

Reset process is used to export reset signal to open flow path;

The timing step that resets is used for based at the reset operation of reset process and pick up counting;

The second pressure detecting step is used for detecting the pressure of flow path when using appliance not;

The pressure storing step is used for will being stored at the pressure that the second pressure detecting step detects in the pressure memory unit when using appliance;

The pressure determination step is used for judging whether the pressure that detects in the first pressure detecting step is equal to or less than the pressure that is stored in the pressure memory unit; With

Preferential leak judgement step, be used for early cutting off flow path in a time point place at following two time points, one of them time point is when judging when being equal to or greater than predetermined value through the flow that detects after the scheduled time slot in the flow rate detection step, and another time point is when the pressure that will detect in the first pressure detecting step and the pressure stored in the pressure storing step compare and detect this pressure and is equal to or less than predetermined pressure.

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