CN103528772A - Micro-leakage detector, system with same and detection method of detector - Google Patents
Micro-leakage detector, system with same and detection method of detector Download PDFInfo
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- CN103528772A CN103528772A CN201310494924.7A CN201310494924A CN103528772A CN 103528772 A CN103528772 A CN 103528772A CN 201310494924 A CN201310494924 A CN 201310494924A CN 103528772 A CN103528772 A CN 103528772A
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Abstract
The invention provides a micro-leakage detector, a system with the same and a detection method of the detector. A micro-leakage detector and a valve leakage detecting fault preprocessing device are arranged on storage equipment; the input end of the valve leakage detecting preprocessing device is connected with the output end of a first button and is respectively connected with an air inlet air pressure sensor and an air outlet air pressure sensor; the output end of the valve leakage detecting preprocessing device is respectively connected with an inlet cutoff valve and an outlet cutoff valve; the input end of the micro-leakage detector is connected with the output end of a second button and is connected with an air pressure sensor for the storage equipment; the output end of the micro-leakage detector is respectively connected with the inlet cutoff valve and the outlet cutoff valve. According to the micro-leakage detector, the system with the same and the detection method of the detector, equipment leakage can be effectively found as soon as possible to avoid accident expanding, and non-permanent non-damaging temporary leaking hidden safety loopholes can be automatically processed in advance, so the manual workload can be reduced.
Description
Technical field
Design containers leak hunting technology of the present invention field, is specifically related to a kind of micro-device for detecting leakage, the system of utilizing this device and detection method thereof.
Background technology
In the middle of production run, usually can run into various containers, reactor, tower, combustion furnace, heat interchanger, ice chest, compressor etc. equipment.These equipment have plenty of the generation that is accompanied by inflammable and explosive, poisonous and harmful etc. contaminated environment or security incident possibility and in work.In the various reasons that cause accident, leakage is one of maximum hidden danger.
One, equipment at work, likely starts there is leakage in certain trickle place, traditional crosslinking lock scheme be exactly when pressure low when certain value, just interlock and cut off; But originally leakage rate is little, be perhaps micro-leakage, if when by the time pressure drops to obvious lower value, may leak more seriously, equipment has also become compared with major break down from the glitch starting, and loses greatlyr, also may occur security incident.
Its two, when there is urgent interlocking, import and export stop valve and close, but because valve self is not owing to checking and not putting in place at ordinary times, in existing, leak hidden danger, may in leak, cause in fact terminal valve not shut and the effect failure of interlocking.Equipment is before coming into operation, and traditional valve detection method is that leak detection test is done in ventilation, if defective, just valve is disassembled, and checks if trim damages and changes trim; If check to be not damage, continue valve to load onto, and then repeat to do leak detection test, if qualified, might be that accidental once leak detection is defective just now.
Summary of the invention
In order to overcome the defect existing in above-mentioned prior art, the object of this invention is to provide a kind of micro-device for detecting leakage, the system with this device and detection method thereof, the present invention can be effectively as soon as possible discovering device leak to avoid fault spread, can also help automatically to process in advance the interim leakage hidden danger of impermanency, non-damageability to reduce artificial workload.
In order to realize above-mentioned purpose of the present invention, according to a first aspect of the invention, the invention provides a kind of micro-device for detecting leakage, it comprises: first selector, second selector sum counter, the selection port of described first selector is connected with the output port of described the second button, the first signal input port connecting to neutral of described first selector, the secondary signal input port of described first selector connects the output terminal of second selector, the output port of described the second button is connected with the selection port of second selector by pulser, the first signal input port of described second selector is connected with the output terminal of first selector, the secondary signal input port Bonding pressure sensor of described second selector, the output port of described the second button is connected with the reseting port of counter by phase inverter, the output port of described the second button is connected with the beginning port of counter by pulser, the output terminal of described counter connects an input end of multiplier, another input end input scan cycle of described multiplier, the output terminal of described multiplier is connected with the denominator input end of divider, the output terminal of described second selector is connected with one end of subtracter, the other end of described subtracter is connected with the output terminal of pressure transducer, after taking absolute value, the signal of the output terminal output of described subtracter is connected with the molecule input end of divider, the output terminal of described divider is connected with the first input end of comparer, the second input end of described comparer is inputted default interlocking value, the output terminal of described comparer be connected with an input end of door, describedly be connected with the output terminal of the second button with another input end of door, describedly be connected with valve control end with interlock shutdown control end respectively with the output terminal of door.
Micro-device for detecting leakage of the present invention can be effectively as soon as possible discovering device leak to avoid fault spread, can also help automatically to process in advance the interim leakage hidden danger of impermanency, non-damageability to reduce artificial workload.
In order to realize above-mentioned purpose of the present invention, according to a second aspect of the invention, the invention provides a kind of system with micro-device for detecting leakage, it comprises micro-device for detecting leakage, valve leak detection Fault Pre treating apparatus and storage facilities; The input end of described storage facilities is connected with induction pipe, the output terminal of described storage facilities is connected with outlet, on described induction pipe, be provided with import stop valve and air inlet baroceptor, on described outlet, be provided with outlet stop valve and the baroceptor of giving vent to anger, on described storage facilities, be also provided with storage facilities baroceptor; The input end of described valve leak detection Fault Pre treating apparatus is connected with the output terminal of the first button, the input end of described valve leak detection Fault Pre treating apparatus is also connected with the baroceptor of giving vent to anger with air inlet baroceptor respectively, and the output terminal of described valve leak detection Fault Pre treating apparatus is connected with outlet stop valve with import stop valve respectively; The input end of described micro-device for detecting leakage is connected with the output terminal of the second button, and the input end of described micro-device for detecting leakage is also connected with storage facilities baroceptor, and the output terminal of described micro-device for detecting leakage is connected with outlet stop valve with import stop valve respectively.
In a kind of preferred implementation of the present invention, described import stop valve comprises two valves that work alone, and described outlet stop valve comprises two valves that work alone.
In another kind of preferred implementation of the present invention, in the both sides of described induction pipe upper inlet stop valve, there is respectively one group of baroceptor; In the both sides of described outlet upper outlet stop valve, there is respectively one group of baroceptor.
In another preferred implementation of the present invention, described one group of baroceptor comprises three baroceptors that work alone.
In another preferred implementation of the present invention, described valve leak detection Fault Pre treating apparatus also comprises display device, for showing valve leak detection result and processing suggestion.
The system with micro-device for detecting leakage of the present invention is being imported and exported 2 automatic stop valves of connecting separately on pipeline, first can guarantee when equipment occurs that emergency stops, 2 deck valve doors cut off simultaneously, if there is a leakage, another can also be as a guarantee, 2 deck valve doors are less with the possibility of hourglass, improved security.Meanwhile, there is micro-device for detecting leakage, can be effectively as soon as possible discovering device leak to avoid fault spread, can also help automatically to process in advance the interim leakage hidden danger of impermanency, non-damageability to reduce artificial workload.
In order to realize above-mentioned purpose of the present invention, according to a third aspect of the present invention, the invention provides a kind of micro-leakage detection method, comprise the steps:
S1, closed the first button, execution step S2;
S2, import stop valve and outlet stop valve are opened, and start to purge, and record purges number of times p, if do not surpassed N time, continues the T1 time, execution step S3; If purge number of times, surpass N time, perform step S6, the purging number of times of described N for setting;
S3, opens import stop valve, closes outlet stop valve, continues T2 after the time, and high report does not occur the pressure transducer after outlet stop valve, performs step S4; There is high report, perform step S2;
S4, opens outlet stop valve, closes import stop valve, continues T3 after the time, and low report does not occur the pressure transducer before import stop valve, performs step S5; There is low report, perform step S2;
S5, valve leak detection is qualified, stops leak detection, and display device shows the equipment that can formally come into operation, and forwards step S8 to;
S6, valve is hunted leak unsuccessfully, stops leak detection, and display device is pointed out artificial check valve, forwards step S7 to;
S7, artificial unloading, checks and damages and change valve, after installing, forwards step S1 to, and by the number of times p zero clearing of the original record of step S1;
S8, equipment comes into operation, and after equipment stable operation, presses closed the second button 2, forwards step S9 to;
S9, micro-device for detecting leakage detects the pressure change rate of storage facilities, if rate of change surpasses interlocking value, cuts off import stop valve and outlet stop valve.
Micro-leakage detection method of the present invention can detect valve and occur that the situation of micro-leakage appears in micro-leakage and storage facilities, has improved practical security.
In a kind of preferred implementation of the present invention, the method for described micro-device for detecting leakage checkout equipment pressure change rate is:
S81, the second button S2 output closure signal, G=1, the output signal OUT=IN2 of first selector;
S82, is made as 0 by the counting initial value n of counter, and a PLC scan period of the every mistake of count block is counted n=n+1;
S83, the real-time measurement values of the secondary signal input end IN2 input storage facilities baroceptor of second selector;
S84, computing counter counting n and the product of scan period;
S85, subtracts each other the output port OUT value of second selector and the real-time measurement values that detects the storage facilities baroceptor of storage facilities pressure take absolute value, and the result then obtaining divided by step S84, obtains slope K;
S86, if K >=predefined interlocking rate of change interlocking value, and the second button 2 presses, and stops, and import stop valve and outlet stop valve are closed.
In a kind of preferred implementation of the present invention, described pressure change rate is the rate of change of pressure intermediate value.Improved the reliability detecting.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination obviously and is easily understood becoming the description of embodiment, wherein:
Fig. 1 is the structural representation of the micro-device for detecting leakage of the present invention;
Fig. 2 is the structural representation that the present invention has the system of micro-device for detecting leakage;
Fig. 3 is the process flow diagram of the micro-leakage detection method of the present invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be interpreted broadly, for example, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be to be directly connected, and also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.
The invention provides a kind of micro-device for detecting leakage, as shown in Figure 1, it comprises: first selector, second selector sum counter, wherein, the selection port of first selector is connected with the output port of the second button, the first signal input port connecting to neutral of described first selector, its output terminal is selected in the secondary signal input port connection second of first selector, the output port of the second button is connected with the selection port of second selector by pulser, the first signal input port of described second selector is connected with the output terminal of first selector, the secondary signal input port Bonding pressure sensor of described second selector, the output port of the second button is connected with the reseting port of counter by phase inverter, the output port of described the second button is connected with the beginning port of counter, the output terminal of described counter connects an input end of multiplier, another input end input scan cycle of described multiplier, the output terminal of described multiplier is connected with the denominator input end of divider, the output terminal of described second selector is connected with one end of subtracter, the other end of described subtracter is connected with the output terminal of pressure transducer, after taking absolute value, the signal of the output terminal output of described subtracter is connected with the molecule input end of divider, the output terminal of described divider is connected with the first input end of comparer, the second input end of described comparer is inputted default interlocking value, the output terminal of described comparer be connected with an input end of door, describedly be connected with the output terminal of the second button with another input end of door, describedly be connected with valve control end with interlock shutdown control end respectively with the output terminal of door.
The present invention also provides a kind of system with micro-device for detecting leakage, and as shown in Figure 2, it comprises micro-device for detecting leakage, valve leak detection Fault Pre treating apparatus and storage facilities; The input end of described storage facilities is connected with induction pipe, and the output terminal of described storage facilities is connected with outlet, is provided with import stop valve and air inlet baroceptor on described induction pipe, is provided with outlet stop valve and the baroceptor of giving vent to anger on described outlet.On described storage facilities, be also provided with storage facilities baroceptor; The input end of described valve leak detection Fault Pre treating apparatus is connected with the output terminal of the first button, the input end of described valve leak detection Fault Pre treating apparatus is also connected with the baroceptor of giving vent to anger with air inlet baroceptor respectively, and the output terminal of described valve leak detection Fault Pre treating apparatus is connected with outlet stop valve with import stop valve respectively; The input end of described micro-device for detecting leakage is connected with the output terminal of the second button, and the input end of described micro-device for detecting leakage is also connected with storage facilities baroceptor, and the output terminal of described micro-device for detecting leakage is connected with outlet stop valve with import stop valve respectively.
In the present embodiment, import stop valve comprises two valves that work alone, and described outlet stop valve comprises two valves that work alone.Importing and exporting two stop valves of connecting separately on pipeline, first can guarantee that two deck valve doors cut off simultaneously when equipment occurs that emergency stops, if there is a leakage, another can also be as a guarantee, and two deck valve doors are less with the possibility of hourglass, improved security.Before putting equipment in service, first to automatically open two deck valve doors ventilation purging pipeline number minute.Automatically open upstream valve, automatically close valve downstream, stability number minute, if the pressure after valve downstream does not have high report, illustrates that the valve in downstream does not leak, otherwise explanation is leaked, and need to automatically come back to purge step; Automatically open valve downstream, automatically close upstream valve, stability number minute, if the not low report of pressure before upstream valve illustrates that the valve of upstream does not leak, otherwise explanation is leaked, and need to automatically come back to purge step.Not testing temporary derangement by leak detection, by the method repeatedly purging, can rough handling fall, until it is qualified to hunt leak, equipment just can come into operation.If repeatedly purged all defectively many times, can in energy threshold, really there is damage, now need to pull down and check and change.
In the present embodiment, in the both sides of described induction pipe upper inlet stop valve, there is respectively one group of baroceptor, in the both sides of described outlet upper outlet stop valve, there is respectively one group of baroceptor.In a kind of embodiment being more preferably of the present invention, described one group of baroceptor comprises three baroceptors that work alone.As shown in Figure 2, provided upstream at induction pipe import stop valve is equipped with baroceptor PT11, baroceptor PT12 and baroceptor PT13, in the downstream of induction pipe import stop valve, is provided with baroceptor PT21, baroceptor PT22 and baroceptor PT23; Provided upstream at outlet outlet stop valve is equipped with baroceptor PT31, baroceptor PT32 and baroceptor PT33, in the downstream of outlet outlet stop valve, is provided with baroceptor PT41, baroceptor PT42 and baroceptor PT43.In the present embodiment, storage facilities baroceptor also comprises three independently baroceptors, as shown in Figure 2, is baroceptor PT51, baroceptor PT52 and baroceptor PT53.The actual force value of doing leak detection judgement is in three pressure units, to filter a minimum value, filter a maximal value, get intermediate value, for example, baroceptor PT11, baroceptor PT12 and baroceptor PT13 detect respectively the pressure of induction pipe import stop valve upstream, if the force value that baroceptor PT11 detects is between baroceptor PT12 and the force value of baroceptor PT13 detection, filter a minimum value, filter a maximal value, get the detected value of intermediate value baroceptor PT11.In the present embodiment, 5 groups of baroceptors all adopt same detection method, all get the intermediate value of three testing results, and therefore not to repeat here.
In the present embodiment, described valve leak detection Fault Pre treating apparatus also comprises display device, for showing valve leak detection result and processing suggestion.Be convenient to user's operation.
The present invention also provides a kind of micro-leakage detection method, and as shown in Figure 3, it comprises the steps:
S1, closed the first button, execution step S2;
S2, import stop valve and outlet stop valve are opened, and start to purge, and record purges number of times p, if do not surpassed N time, continues the T1 time, execution step S3; If purge number of times, surpass N time, perform step S6, the purging number of times of described N for setting;
S3, opens import stop valve, closes outlet stop valve, continues T2 after the time, and high report does not occur the pressure transducer after outlet stop valve, performs step S4; There is high report, perform step S2;
S4, opens outlet stop valve, closes import stop valve, continues T3 after the time, and low report does not occur the pressure transducer before import stop valve, performs step S5; There is low report, perform step S2;
S5, valve leak detection is qualified, stops leak detection, and display device shows the equipment that can formally come into operation, and forwards step S8 to;
S6, valve is hunted leak unsuccessfully, stops leak detection, and display device is pointed out artificial check valve, forwards step S7 to;
S7, artificial unloading, checks and damages and change valve, after installing, forwards step S1 to, and by the number of times p zero clearing of the original record of step S1;
S8, equipment comes into operation, and after equipment stable operation, presses closed the second button 2, forwards step S9 to;
S9, micro-device for detecting leakage detects the pressure change rate of storage facilities, if rate of change surpasses interlocking value, cuts off import stop valve and outlet stop valve.
In the present embodiment, the method for described micro-device for detecting leakage checkout equipment pressure change rate is:
S81, the second button S2 output closure signal, G=1, the output signal OUT=IN2 of first selector;
S82, is made as 0 by the counting initial value n of counter, and a PLC scan period of the every mistake of count block is counted n=n+1;
S83, the real-time measurement values of the secondary signal input end IN2 input storage facilities baroceptor of second selector;
S84, computing counter counting n and the product of scan period;
S85, subtracts each other the output port OUT value of second selector and the real-time measurement values that detects the storage facilities baroceptor of storage facilities pressure take absolute value, and the result then obtaining divided by step S84, obtains slope K;
S86, if K >=predefined interlocking rate of change interlocking value, and the second button 2 presses, and stops, and import stop valve and outlet stop valve are closed.
In the present embodiment, described pressure change rate is the rate of change of pressure intermediate value.
In a preferred embodiment of the present invention, in mix refrigerant liquefied natural gas (LNG) project, the natural gas runner in ice chest and pipeline leakage thereof are detected to protection and valve pre-service leakage hidden danger checks in real time.
Three pressure units are equipped with on the upstream valve left side of emergency cut-off, and valve downstream is equipped with three pressure units.The actual force value of doing leak detection judgement is in three pressure units, to filter a minimum value, filters a maximal value, gets intermediate value.
Pressure intermediate value before upstream valve on rock gas cooling box pipeline can be used for judging whether ice chest runner and pipeline thereof leak.
A, storage facilities (being ice chest in the present embodiment), before formally entering rock gas, are first pressed the first button (detecting valve leak button), produce the command signal S1 that starts leak detection, have produced simultaneously and have allowed leak detection interlocking signal S1, forward step B to;
B, open import stop valve and outlet stop valve on a pipeline wherein, and start to purge, whenever entering B step one time, purge number of times m=m+1, initial value m=0, if m≤N continues several minutes, forwards step C to; If m >=10, forward step F to, in the present embodiment, purging number of times setting value can determine according to actual conditions, and in an embodiment being more preferably of the present invention, N is 10.
C, open import stop valve, close outlet stop valve, stability number minute, there is not high report in the pressure intermediate value that the pressure transducer of outlet stop valve detects, forwards step D to; There is high report, forward step B to;
D, open outlet stop valve, close import stop valve, stablize the T1 time, there is not low report in the pressure intermediate value that the pressure transducer before import stop valve detects, forwards step e to; There is low report, forward step B to;
The leak detection of E, valve is qualified, stops leak detection, and the prompting equipment that can come into operation, and forwards step H to;
F, valve are hunted leak unsuccessfully, stop leak detection, and point out artificial check valve, forward step G to;
G, artificial unloading, check and damage and change valve, after installing, forwards steps A to;
H, ice chest formally come into operation, and enter rock gas, after ice chest stable operation, press the second button (equipment detects in real time and leaks button), and the equipment that produced allows interlocking signal S2; Forward step I to;
The rate of change that I, detection ice chest pressure intermediate value reduce, if rate of change surpasses interlocking value, stops, and cuts off the valve of import and export.
In the present embodiment, the rate of change assay method that ice chest pressure intermediate value reduces is as follows:
A1, the second button S2 output closure signal, G=1, the output signal OUT=IN2 of first selector, when G=0, OUT=IN1; When G=1, OUT=IN2.
B1, when S2 signal is 1, the counting initial value n of counter is made as to 0, a PLC scan period of the every mistake of count block is counted n=n+1;
The first signal input end IN1 of the output terminal OUT of C1, first selector and second selector 2 is connected, the secondary signal input end IN2 of the output terminal OUT of second selector and first selector is connected, the real-time measurement values of the secondary signal input end IN2 input storage facilities baroceptor of second selector.
D1, the second button connect the G end of first selector, the second button connects the starting end of counter by pulser, after the output signal negate of the second button, connect the clear terminal of counter, the second button connects the G end that 5 pulse per second (PPS) devices are received second selector afterwards again, computing counter counting n and the product of scan period.
E1, the output port OUT value of second selector and the real-time measurement values that detects the storage facilities baroceptor of storage facilities pressure are subtracted each other and taken absolute value, the result then obtaining divided by step S84, obtains slope K.
If F1 is K >=predefined interlocking rate of change interlocking value, and the second button 2 is in down state, stops, and import stop valve and outlet stop valve are closed.
Visible, after having done this technological improvement of the present invention, before each start-stop equipment, all can automatically do stop valve leak detection, and rough handling is volatile, the interim leakage hidden danger of non-damageability, qualified rear ability formally comes into operation equipment; Equipment, after stable operation, by detecting real-time pressure value and the variable quantity of this period of mistiming being carried out to the minute leakage of judgment device with the difference of the firm stable force value soon of equipment, thereby can be pinpointed the problems in advance, is unlikely to equipment failure and expands; Owing to cutting off the mode that adopts series connection two deck valve doors, the performance that ensures safety is more reliable.
The present invention has economized in large quantities the artificial leak detection time and can also shift to an earlier date discovering device reliably leaks, and has both increased security, has improved again automatization level, can also avoid equipment failure extension.
It should be noted that, though the present invention only discloses the leak detection of liquefied natural gas (LNG) ice chest runner, having more than is to be confined to be applied to liquefied natural gas (LNG) ice chest runner.So long as likely adopt the method for driving automatic leak detection and rough handling, and the method for discovering device minute leakage in advance after stable operation.These all should comprise with the present invention in the middle of.
In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present invention and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.
Claims (9)
1. a micro-device for detecting leakage, is characterized in that, comprising: first selector, second selector sum counter,
The selection port of described first selector is connected with the output port of described the second button, the first signal input port connecting to neutral of described first selector, and the secondary signal input port of described first selector connects the output terminal of second selector;
The output port of described the second button is connected with the selection port of second selector by pulser, the first signal input port of described second selector is connected with the output terminal of first selector, the secondary signal input port Bonding pressure sensor of described second selector;
The output port of described the second button is connected with the reseting port of counter by phase inverter, the output port of described the second button is connected with the beginning port of counter by pulser, the output terminal of described counter connects an input end of multiplier, another input end input scan cycle of described multiplier, the output terminal of described multiplier is connected with the denominator input end of divider, the output terminal of described second selector is connected with one end of subtracter, the other end of described subtracter is connected with the output terminal of pressure transducer, after taking absolute value, the signal of the output terminal output of described subtracter is connected with the molecule input end of divider, the output terminal of described divider is connected with the first input end of comparer, the second input end of described comparer is inputted default interlocking value, the output terminal of described comparer be connected with an input end of door, describedly be connected with the output terminal of the second button with another input end of door, describedly be connected with valve control end with interlock shutdown control end respectively with the output terminal of door.
2. a system with micro-device for detecting leakage claimed in claim 1, is characterized in that: comprise micro-device for detecting leakage, valve leak detection Fault Pre treating apparatus and storage facilities;
The input end of described storage facilities is connected with induction pipe, the output terminal of described storage facilities is connected with outlet, on described induction pipe, be provided with import stop valve and air inlet baroceptor, on described outlet, be provided with outlet stop valve and the baroceptor of giving vent to anger, on described storage facilities, be also provided with storage facilities baroceptor;
The input end of described valve leak detection Fault Pre treating apparatus is connected with the output terminal of the first button, the input end of described valve leak detection Fault Pre treating apparatus is also connected with the baroceptor of giving vent to anger with air inlet baroceptor respectively, and the output terminal of described valve leak detection Fault Pre treating apparatus is connected with outlet stop valve with import stop valve respectively;
The input end of described micro-device for detecting leakage is connected with the output terminal of the second button, and the input end of described micro-device for detecting leakage is also connected with storage facilities baroceptor, and the output terminal of described micro-device for detecting leakage is connected with outlet stop valve with import stop valve respectively.
3. the system with micro-device for detecting leakage as claimed in claim 2, is characterized in that, described import stop valve comprises two valves that work alone, and described outlet stop valve comprises two valves that work alone.
4. the system with micro-device for detecting leakage as claimed in claim 3, is characterized in that, in the both sides of described induction pipe upper inlet stop valve, has respectively one group of baroceptor; In the both sides of described outlet upper outlet stop valve, there is respectively one group of baroceptor.
5. the system with micro-device for detecting leakage as claimed in claim 4, is characterized in that, described one group of baroceptor comprises three baroceptors that work alone.
6. the system with micro-device for detecting leakage as claimed in claim 2, is characterized in that, described valve leak detection Fault Pre treating apparatus also comprises display device, for showing valve leak detection result and processing suggestion.
7. a micro-leakage detection method for system described in claim 2, is characterized in that, comprises the steps:
S1, closed the first button, execution step S2;
S2, import stop valve and outlet stop valve are opened, and start to purge, and record purges number of times p, if do not surpassed N time, continues the T1 time, execution step S3; If purge number of times, surpass N time, perform step S6, the purging number of times of described N for setting;
S3, opens import stop valve, closes outlet stop valve, continues T2 after the time, and high report does not occur the pressure transducer after outlet stop valve, performs step S4; There is high report, perform step S2;
S4, opens outlet stop valve, closes import stop valve, continues T3 after the time, and low report does not occur the pressure transducer before import stop valve, performs step S5; There is low report, perform step S2;
S5, valve leak detection is qualified, stops leak detection, and display device shows the equipment that can formally come into operation, and forwards step S8 to;
S6, valve is hunted leak unsuccessfully, stops leak detection, and display device is pointed out artificial check valve, forwards step S7 to;
S7, artificial unloading, checks and damages and change valve, after installing, forwards step S1 to, and by the number of times p zero clearing of the original record of step S1;
S8, equipment comes into operation, and after equipment stable operation, presses closed the second button 2, forwards step S9 to;
S9, micro-device for detecting leakage detects the pressure change rate of storage facilities, if rate of change surpasses interlocking value, cuts off import stop valve and outlet stop valve.
8. micro-leakage detection method as claimed in claim 5, is characterized in that, the method for described micro-device for detecting leakage checkout equipment pressure change rate is:
S81, the second button S2 output closure signal, G=1, the output signal OUT=IN2 of first selector;
S82, is made as 0 by the counting initial value n of counter, and a PLC scan period of the every mistake of count block is counted n=n+1;
S83, the real-time measurement values of the secondary signal input end IN2 input storage facilities baroceptor of second selector;
S84, computing counter counting n and the product of scan period;
S85, subtracts each other the output port OUT value of second selector and the real-time measurement values that detects the storage facilities baroceptor of storage facilities pressure take absolute value, and the result then obtaining divided by step S84, obtains slope K;
S86, if K >=predefined interlocking rate of change interlocking value, and the second button 2 presses, and stops, and import stop valve and outlet stop valve are closed.
9. micro-leakage detection method as claimed in claim 7 or 8, is characterized in that, described pressure change rate is the rate of change of pressure intermediate value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310494924.7A CN103528772B (en) | 2013-10-21 | 2013-10-21 | A kind of micro-device for detecting leakage, the system with this device and detection method thereof |
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