CN103292991A - Safety valve opening judging method and online detection method - Google Patents
Safety valve opening judging method and online detection method Download PDFInfo
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- CN103292991A CN103292991A CN 201310256520 CN201310256520A CN103292991A CN 103292991 A CN103292991 A CN 103292991A CN 201310256520 CN201310256520 CN 201310256520 CN 201310256520 A CN201310256520 A CN 201310256520A CN 103292991 A CN103292991 A CN 103292991A
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Abstract
The invention relates to the detection field of safety valves, in particular to a safety valve opening judging method and online detection method. The safety valve opening judging method includes steps that upward additional pulling force is applied to a valve clack of a safety valve; jogging information of the valve clack is detected and electric signals are sent out according to the jogging information; and the electric signals are received and opening information of the safety valve is obtained according to the electric signals. The safety valve opening judging method judges whether the safety valve is opened, only the jogging information of the valve clack is needed to be detected without pulling up the valve clack to find feature points on a curve of external force changing along time, the structure of the safety valve cannot be damaged, and the safety is good.
Description
Technical field
The present invention relates to the safety valve detection range, relate in particular to a kind of judging and opening method and online test method of safety valve.
Background technology
The safety valve online measuring technique is the specialized technology that new development is got up in safety valve and blowdown valve field, so far the history in year surplus in the of existing ten.Because process units must not stop during the opening pressure of online detection and the safety valve of adjusting, produce and carry out as usual, therefore, the widespread use in modernizations such as petrochemical industry, electric power, chemical industry are produced continuously of this technology.
At present, the on-line detector device of commercial Application adopts method of characteristic point as the criterion of declaring out of safety valve unlatching mostly.Namely the flap to safety valve applies continuously compelling force uniformly, shows the time dependent curve of this compelling force simultaneously, and when the flap of safety valve was opened, flap was pulled up, and unique point can appear in this curve, as break, peak dot or flex point.Therefore, find the unique point on the time dependent curve of this compelling force, can judge that the flap of safety valve is opened.
Yet, judge the safety valve unlatching by method of characteristic point, the flap pull-up just unique point can be need found, and with the flap pull-up, the structure of safety valve may be destroyed, poor stability.
Summary of the invention
The object of the present invention is to provide a kind of judging and opening method and online test method of safety valve, to address the above problem.
A kind of judging and opening method of safety valve comprises the steps:
Flap to safety valve applies additional pulling force upwards;
Detect the fine motion information of flap, and send electric signal according to this fine motion information;
Receive described electric signal and obtain the unlatching information of safety valve according to described electric signal.
Compared with prior art, the advantage of the embodiment of the invention is: the judging and opening method of the embodiment of the invention detects the fine motion information of flap, and produces electric signal, obtains the unlatching information of safety valve.This method judges whether safety valve is opened, and not needing the flap pull-up only needs to detect the fine motion information of flap finding the unique point on the time dependent curve of compelling force, can not destroy the structure of safety valve, and security is good.
Description of drawings
Fig. 1 is the block diagram of judging and opening method of the safety valve of the embodiment of the invention;
Fig. 2 is the block diagram of the displacement method of the embodiment of the invention;
Fig. 3 is the block diagram of the audio frequency method of the embodiment of the invention;
Fig. 4 is the block diagram of online test method of the safety valve of the embodiment of the invention.
Embodiment
Also by reference to the accompanying drawings the present invention is described in further detail below by specific embodiment.
A kind of judging and opening method of safety valve comprises the steps: as shown in Figure 1
101, the flap of safety valve is applied additional pulling force upwards;
102, detect the fine motion information of flap, and send electric signal according to this fine motion information;
103, receive described electric signal and obtain the unlatching information of safety valve according to described electric signal.
The judging and opening method of the embodiment of the invention detects the fine motion information of flap, and produces electric signal, obtains the unlatching information of safety valve.This method judges whether safety valve is opened, and not needing the flap pull-up only needs to detect the fine motion information of flap finding the unique point on the time dependent curve of compelling force, can not destroy the structure of safety valve, and security is good.
Wherein, as shown in Figure 2, the fine motion information of described detection flap, and send electric signal according to this fine motion information, can comprise:
201, utilize the fine motion displacement of displacement transducer detection flap, and send electric signal according to described fine motion displacement.
Described utilize the fine motion displacement that displacement transducer detects flap after, send before the electric signal according to described fine motion displacement, also comprise:
202, the displacement threshold value contrast that described fine motion displacement and described displacement transducer is default is if described fine motion displacement greater than described displacement threshold value, is then sent electric signal.That is, the fine motion displacement that produces when the flap of safety valve is during greater than default displacement threshold value, judges that flap opens, and sends electric signal to data processing unit synchronously.Wherein data processing unit can be demarcated sensor, lower bound voltage is checked, measure zero clearing, effectively avoids sensor generation zero point drift phenomenon, causes the error of checking precision.
Particularly, the default displacement threshold value of described displacement transducer is 0.0625mm.Certainly, described displacement threshold value can also be worth for other, according to different safety valve, and default different displacement threshold value, the fine motion displacement of flap when satisfying the unlatching of different safety valve.
Above-mentionedly detect the fine motion information of flap and judge that the method that flap is opened can be called displacement method by displacement transducer.From the above, displacement method is owing to use high-precision displacement transducer, and this method has precision height, accuracy of judgement, the fast advantage of response speed.
In addition, as shown in Figure 3, detect the fine motion information of flap except adopting displacement method, the fine motion information of described detection flap, and send electric signal according to this fine motion information, can also comprise:
301, the sound signal that the crack slit when utilizing pickup head detection high pressure draught to open by flap produces, and send this sound signal; That is when flap is opened, between flap and the safety valve valve body a crack slit can appear,, high pressure draught in the safety valve can produce sound during by this crack slit, and pickup head detects this sound, namely detect this sound signal, this sound signal is sent.
303, receive described sound signal, and send electric signal according to this sound signal.Particularly, can receive this sound signal by earphone, after the operator hears sound signal in the earphone, judge that safety valve opens information.
Wherein, the sound signal that the crack slit when utilizing pickup head to detect high pressure draught to open by flap produces, and sending after this sound signal receives described sound signal, and sends before the electric signal according to this sound signal, also comprises:
302, the sound signal that sends is carried out high gain-bandwidth filtering.Since this sound signal a little less than, but also might mix other on-the-spot sound, in order to improve this sound signal, make the operator can clearly hear and identify this sound signal, can also carry out high gain-bandwidth filtering to the sound signal that pickup head sends and handle, with this sound signal gain and filtering.
Above-mentioned method of opening by pickup head detection sound signal and judgement can be called audio frequency method.
In sum, adopt displacement method or adopt audio frequency method to judge the mode that safety valve is opened, avoided the safety valve that artificial error component brings in the process that applies additional pulling force to open error in judgement.
Preferably, the flap of safety valve is applied additional pulling force upwards, comprising:
Utilize the flap of hydraulic means and/or jack pair safety valve to apply additional pulling force upwards.
Simultaneously, the embodiment of the invention also provides a kind of online test method of safety valve according to above-mentioned judging and opening method, as shown in Figure 4, comprises the steps:
401, the inlet pressure Po of storage security valve in advance;
402, storage medium acts on the useful area S on the flap of safety valve in advance;
403, utilize the judging and opening method of above-mentioned safety valve to detect the critical opening of safety valve, send and declare out instruction;
404, receive the described instruction of declaring out, and declare out instruction and send recording instruction according to described;
405, receive described recording instruction, and send current critical additional value of thrust △ F according to described recording instruction;
406, receive described critical additional value of thrust △ F and extract described inlet pressure Po and useful area S, according to the opening pressure computing formula Ps=Po+ △ F/S of safety valve, obtain the opening pressure of safety valve.
The detection principle of this online test method is as follows: for a spring safety valve that is in closed condition and normal operation.Downward initial tension of spring Fd of flap effect to safety valve, this pretightning force part is used for resisting the interior gases at high pressure of safety valve to the pressure P o * S of flap, wherein Po is the pressure of gases at high pressure, S is that gases at high pressure act on the useful area on the flap, another part is used for resisting the mutual snap-in force f between the seal of flap and safety valve, and wherein this snap-in force f is enough to keep safety valve to be sealing state.Along with the pressure of the gases at high pressure in the safety valve improves constantly, snap-in force f can reduce thereupon, and when gases at high pressure reached opening pressure Ps * S to the pressure of flap, snap-in force f equaled 0, and safety valve is opened, and namely satisfies this moment
Fd=Ps×S
If the additional pulling force △ F that makes progress for one of flap then should add pulling force △ F except opposing snap-in force f, also need overcome initial tension of spring Fd outside safety valve.Along with the increase of additional pulling force, snap-in force reduces gradually, and when snap-in force equalled zero, safety valve reached opening, and this moment, gases at high pressure just overcame initial tension of spring Fd to pressure P o * S and the additional pulling force △ F of flap, namely
Fd=Po×S+△F
Obtained by above-mentioned two fundamental formulars:
Ps=Po+△F/S
That is, the additional pulling force △ F when measuring the safety valve unlatching, the pressure Po of safety valve inner high voltage gas and gases at high pressure act on the useful area S on the flap, just can calculate the opening pressure of safety valve.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the judging and opening method of a safety valve is characterized in that, comprises the steps:
Flap to safety valve applies additional pulling force upwards;
Detect the fine motion information of flap, and send electric signal according to this fine motion information;
Receive described electric signal and obtain the unlatching information of safety valve according to described electric signal.
2. the judging and opening method of safety valve as claimed in claim 1 is characterized in that, the fine motion information of described detection flap, and send electric signal according to this fine motion information, comprising:
Utilize the fine motion displacement of displacement transducer detection flap, and send electric signal according to described fine motion displacement.
3. the judging and opening method of safety valve as claimed in claim 2 is characterized in that, described utilize the fine motion displacement that displacement transducer detects flap after, send before the electric signal according to described fine motion displacement, also comprise:
The displacement threshold value contrast that described fine motion displacement and described displacement transducer is default is if described fine motion displacement greater than described displacement threshold value, is then sent electric signal.
4. the judging and opening method of safety valve as claimed in claim 3 is characterized in that, the default displacement threshold value of described displacement transducer is 0.0625mm.
5. the judging and opening method of safety valve as claimed in claim 1 is characterized in that, the fine motion information of described detection flap, and send electric signal according to this fine motion information, comprising:
The sound signal that crack slit when utilizing pickup head detection high pressure draught to open by flap produces, and send this sound signal;
Receive described sound signal, and send electric signal according to this sound signal.
6. the judging and opening method of safety valve as claimed in claim 5, it is characterized in that, the sound signal that crack slit when utilizing pickup head detection high pressure draught to open by flap produces, and send after this sound signal, receive described sound signal, and send before the electric signal according to this sound signal, also comprise:
The sound signal that sends is carried out high gain-bandwidth filtering.
7. as the judging and opening method of each described safety valve in the claim 1～6, it is characterized in that, the flap of safety valve applied additional pulling force upwards, comprising:
Utilize the flap of hydraulic means and/or jack pair safety valve to apply additional pulling force upwards.
8. the online test method of a safety valve is characterized in that, comprises the steps:
The inlet pressure Po of storage security valve in advance;
Storage medium acts on the useful area S on the flap of safety valve in advance;
Utilize the critical opening that detects safety valve as the judging and opening method of each described safety valve in the claim 1～7, send and declare out instruction;
Receive the described instruction of declaring out, and declare out instruction and send recording instruction according to described;
Receive described recording instruction, and send current critical additional value of thrust △ F according to described recording instruction;
Receive described critical additional value of thrust △ F and extract described inlet pressure Po and useful area S, according to the opening pressure computing formula Ps=Po+ △ F/S of safety valve, obtain the opening pressure of safety valve.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310256520 CN103292991A (en) | 2013-06-25 | 2013-06-25 | Safety valve opening judging method and online detection method |
| CN201410160670.XA CN103913306A (en) | 2013-06-25 | 2014-04-21 | Opening judgment method and online detection method of safety valve |
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| CN 201310256520 CN103292991A (en) | 2013-06-25 | 2013-06-25 | Safety valve opening judging method and online detection method |
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| CN201410160670.XA Pending CN103913306A (en) | 2013-06-25 | 2014-04-21 | Opening judgment method and online detection method of safety valve |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105806598A (en) * | 2014-12-30 | 2016-07-27 | 华润电力（菏泽）有限公司 | Hydraulic control butterfly valve detection method and alarm system |
| CN109683043A (en) * | 2018-12-28 | 2019-04-26 | 北京强度环境研究所 | It is a kind of to minimize wireless polarity check instrument and solenoid valve polarity test system |
| CN112798166A (en) * | 2021-03-15 | 2021-05-14 | 中鸿阀门股份有限公司 | Minimum opening pressure testing device and method for swing check valve |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020055267A1 (en) * | 2018-09-11 | 2020-03-19 | Ideation As | In-line testing of pressure safety valves |
| CN111595539B (en) * | 2020-04-26 | 2022-03-15 | 深圳市质量安全检验检测研究院 | Safety valve spring stiffness determination method and terminal |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0493746A (en) * | 1990-08-09 | 1992-03-26 | Okashiyou Service Kk | Method for setting pressure regulator of safety value |
| GB0504491D0 (en) * | 2005-03-04 | 2005-04-13 | Seetru Ltd | Sealing force in spring loaded safety valve for given pressure set-to-leak |
| CN101280861A (en) * | 2008-05-28 | 2008-10-08 | 北京沙驼石化工程技术开发有限公司 | Safety valve judging and opening method and apparatus |
-
2013
- 2013-06-25 CN CN 201310256520 patent/CN103292991A/en active Pending
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2014
- 2014-04-21 CN CN201410160670.XA patent/CN103913306A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105806598A (en) * | 2014-12-30 | 2016-07-27 | 华润电力（菏泽）有限公司 | Hydraulic control butterfly valve detection method and alarm system |
| CN105806598B (en) * | 2014-12-30 | 2018-02-16 | 华润电力（菏泽）有限公司 | A kind of hydraulic butterfly valve detection method and warning system |
| CN109683043A (en) * | 2018-12-28 | 2019-04-26 | 北京强度环境研究所 | It is a kind of to minimize wireless polarity check instrument and solenoid valve polarity test system |
| CN112798166A (en) * | 2021-03-15 | 2021-05-14 | 中鸿阀门股份有限公司 | Minimum opening pressure testing device and method for swing check valve |
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| CN103913306A (en) | 2014-07-09 |
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Application publication date: 20130911 |