CN203132763U - Pressure releasing valve verifying device - Google Patents
Pressure releasing valve verifying device Download PDFInfo
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- CN203132763U CN203132763U CN 201320154069 CN201320154069U CN203132763U CN 203132763 U CN203132763 U CN 203132763U CN 201320154069 CN201320154069 CN 201320154069 CN 201320154069 U CN201320154069 U CN 201320154069U CN 203132763 U CN203132763 U CN 203132763U
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- pressure
- relief valve
- pressure relief
- valve
- precompressed
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Abstract
The utility model relates to a pressure releasing valve verifying device including a mechanical part and a control system. The pressure releasing valve verifying device is characterized in that the mechanical part includes an air pump, a pre-pressing air inlet electromagnetic valve, a pre-pressing-end air capacitor and a pressure control electromagnetic valve. A to-be-verified pressure releasing valve is connected with the pressure control electromagnetic valve. The pressure control electromagnetic valve is connected with the pre-pressing air inlet electromagnetic valve through the pre-pressing-end air capacitor. The pressure control electromagnetic valve is connected with the air pump. The pressure releasing valve verifying device (with the total mass that is less than 10 kg) provided by the utility model can be used for realizing field verification easily and has a good effect on quick faults diagnosis and action performance judgment of the pressure releasing valve.
Description
[technical field]
The utility model relates to the pressure relief valve technical field, specifically, is a kind of pressure relief valve calibration equipment.
[background technology]
Pressure relief valve is one of important means of power transformer interior fault protection.Along with the increase of the time limit, each parts of pressure relief valve are wearing out of spring especially, will influence the pressure relief valve accuracy of action.And all pressure relief valves can't effectively be overhauled and verification by reason such as limitation of field condition after installing always now, have not still both had the on-line testing instrument both at home and abroad, and corresponding off-line tester also relatively lacks.The pressure relief valve method of calibration mainly is to discharge the method for impacting suddenly after adopting gaseous tension gas storage at present, there is calibration equipment heaviness (the package unit quality is greater than 300kg) in the method, can only finish verification in testing laboratory, checking procedure noise and energy consumption are all higher, and owing to there is potential safety hazard in high-pressure gas, can't realize the pressure relief valve field-checking.
[utility model content]
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of pressure relief valve calibration equipment is provided.
The purpose of this utility model is achieved through the following technical solutions:
A kind of pressure relief valve calibration equipment, it comprises mechanical part and control system, it is characterized in that, described mechanical part comprises air pump, precompressed air inlet solenoid valve, pre-pressure side air-capacitor and electromagnetic pressure control valve link to each other pressure relief valve to be verified with electromagnetic pressure control valve, electromagnetic pressure control valve links to each other with precompressed air inlet solenoid valve by pre-pressure side air-capacitor, and precompressed air inlet solenoid valve links to each other with air pump.
Described pre-pressure side air-capacitor links to each other with precompressed end pressure sensor.
Described pre-pressure side air-capacitor links to each other with the precompressed exhaust solenoid valve.
Described pressure relief valve to be verified links to each other with tested exhaust solenoid valve.
Connect by general-purpose interface between each parts of described mechanical part.
Described control system is that four parts are formed, and first is calibration module, and second portion is the pressure relief valve detection module, and third part is the impermeability detection module, and the 4th part is communication module, and four modules link to each other with program of lower computer respectively.
Described calibration module is precompressed calibration and digital module calibration.
Described pressure relief valve detection module is divided into pre-pressure-controlled, and operating pressure value three parts are read in pressure control.
Described impermeability detection module is divided into pressure control and force value is uploaded two parts.
Described communication module is divided into 232 communications and SPI communication two parts.
The module of described control system is proven technique, can directly buy in market.
Compared with prior art, good effect of the present utility model is:
This calibration equipment, but procedural test checking and the output of gas pressure control speed by quasistatic pressure, thereby reach the verification purpose identical with the laboratory calibration equipment, while gas storage pressure less (gas storage pressure is less than 300kPa), make pressure gas storage and quick electromagnetic valve control output by the micro pressure pump, make power be far smaller than the laboratory calibration equipment.And can realize field-checking (the package unit quality is less than 10kg) easily, judge to have good effect for quick diagnosis and the performance of pressure relief valve fault.
[description of drawings]
Fig. 1 principle assumption diagram of the present utility model.
Fig. 2 control system structural drawing of the present utility model.
Fig. 3 precompressed calibration synoptic diagram;
Fig. 4 digital module calibration block diagram;
Fig. 5 impermeability detection architecture block diagram
Fig. 6 communication function structured flowchart
Fig. 7 speed control communication event drives flow process
Fig. 8 speed control master routine function operational scheme
Fig. 9 receives tested precompressed value and sets communication event driving flow process
Figure 10 receives tested precompressed value and sets master routine function operational scheme
[embodiment]
The embodiment of a kind of pressure relief valve calibration equipment of the utility model below is provided.
Embodiment 1
See also attached Fig. 1 and 2, a kind of pressure relief valve calibration equipment, it comprises air pump, precompressed air inlet solenoid valve, pre-pressure side air-capacitor, the precompressed exhaust solenoid valve, precompressed end pressure sensor, pre-pressure-controlled solenoid valve, PC, pressure relief valve to be verified is linked to each other with electromagnetic pressure control valve by general-purpose interface, and electromagnetic pressure control valve links to each other with precompressed air inlet solenoid valve by pre-pressure side air-capacitor, and precompressed air inlet solenoid valve is connected with the control module of PC by air pump.
Described pre-pressure side air-capacitor links to each other with precompressed end pressure sensor.
Described pre-pressure side air-capacitor links to each other with the precompressed exhaust solenoid valve.
Described pressure relief valve to be verified links to each other with tested exhaust solenoid valve.
Described pressure relief valve to be verified is connected with the control module of PC by digital module.
A kind of method of calibration of pressure relief valve, its concrete steps be,
(1) calibration,
Be calibrated to the calibration of precompressed calibration and digital module:
The precompressed calibration function carries out the measurement of force value by precompressed end pressure sensor, before carrying out the force value measurement, in order to guarantee the accuracy of measured value, need calibrate force value, and the process block diagram is illustrated in fig. 3 shown below; At first open tested exhaust solenoid valve, electromagnetic pressure control valve and precompressed exhaust solenoid valve directly communicate precompressed end pressure sensor with ambient atmosphere.Treat after a period of stabilisation, the AD sign indicating number of precompressed end sensor is noted, the AD sign indicating number during as zero point correction.Carry out the full scale calibration then.Open air pump, precompressed air inlet solenoid valve cuts out the precompressed exhaust solenoid valve, opens electromagnetic pressure control valve, closes tested exhaust solenoid valve.By the digital module measured pressure value, when force value reaches 110kPa, close air pump and precompressed air inlet solenoid valve; Regulate force value by the precompressed exhaust solenoid valve, when force value is stabilized in 100kPa, the AD sign indicating number of precompressed end sensor is noted, as the punctual AD sign indicating number in full journey school.According to current AD sign indicating number, zero point, the AD sign indicating number when AD sign indicating number and 100kPa carried out the calculating of force value.Obtain the current pressure value.
The digital module calibration:
The digital module calibration comprises zero point correction and full journey calibration, as shown in Figure 4.Digital module carried out calibration with standard pressure generator when dispatching from the factory.In use, if force value needs to recalibrate, can directly link to each other digital module with standard pressure generator and calibrate.Earlier digital module is communicated with atmosphere during calibration, the zero point correction order is sent out to digital module in stable back.After digital module was finished and handled the zero point correction instruction, single-chip microcomputer was sent out from the trend digital module and is read the force value instruction, and digital module returns current force value.The force value of standard pressure generator is transferred to 0.25MPa, and stable back sends out the journey calibration command full to digital module, and after digital module was handled satisfactory journey calibration command, single-chip microcomputer was sent out from the trend digital module and read the force value instruction, and digital module returns current force value.State when digital module can revert to calibration parameter to dispatch from the factory by the factory reset order.Carry out to recover to dispatch from the factory and upload force value automatically about 10 seconds after the order.
Single-chip microcomputer carries out communication by RS232 interface and digital module and ARM.Receive the zero point correction instruction of ARM and expire the journey calibration command by communications protocol, instruction is passed to digital module by the communications protocol of digital module.Can send zero point correction to single-chip microcomputer after digital module is handled zero point correction and expired the journey calibration command and calibrate the acknowledgement frame of finishing with full journey, after single-chip microcomputer receives and calibrates the acknowledgement frame of finishing, read the force value instruction by communications protocol to the digital module transmission, the force value that digital module reads is passed to host computer by single-chip microcomputer.
(2) detection of pressure relief valve
Pre-pressure-controlled:
The pressure survey of pre-pressure side changes pressure signal into the mv signal by the preload pressure sensor, and giving the AD7714 chip with the form of differential signal, to carry out the AD conversion be analog signal conversion 24 digital signal.Sensor signal realize to be amplified at the AD chip internal by the configuration control word, and enlargement factor is 32. by calculating the AD value to be scaled force value then.The mode of interrupting is adopted in the measurement of AD signal, after AD converts, once interrupts to the single-chip microcomputer application every 20ms, and the single-chip microcomputer response interrupts reading the AD sign indicating number of force value.AD chip and single-chip microcomputer adopt same clock source.
In the pressure control procedure, realize quick step-down and the step-down at a slow speed of force value by the dutycycle of control solenoid valve, by the increase of air pump realization force value.The dutycycle of solenoid valve is regulated by rule according to the requirement of pressure set points, keeps the stable of force value.In the step-down control procedure, when pressure set points and pressure measuring value differed big, the dutycycle of solenoid valve was bigger, along with pressure measuring value more and more near setting value, the dutycycle of solenoid valve is then more and more littler.When pressure set points is equal with pressure measuring value, closed electromagnetic valve.In the process of boosting, by the control air pump force value is increased.Force value fluctuation for fear of the air pump flow causes greatly makes the precompressed value be higher than setting value 10kPa earlier at boost phase, by regulating the dutycycle of solenoid valve, realizes the fine setting of force value in the step-down process then.
Pressure control:
Adopt the mode of regulating the solenoid valve dutycycle to control speed.In the pressure control procedure, single-chip microcomputer is control cycle and measuring period with 10ms, the real time record force value, and the mode with the data recursion, new data of every adding, just remove the data in a Geju City, upgrade the data recording of array, the force value of 6 nearest points before pressure data values in the array is always.After the pressure relief valve action, pressure continues to reduce, and this moment is output pressure slowly, if it is big that monitoring pressure relief valve pressure becomes, then finish the one-time detection process, open tested end solenoid valve, the gas circuit of pressure relief valve directly communicates with atmosphere, uploads opening pressure value and returning pressure value simultaneously.
(3) bubble-tight detection:
In the impermeability testing process, at first carry out pre-pressure-controlled.After force value reaches setting value, stop pre-pressure-controlled.Through behind the setting-up time, the record start force value records the end force value after a period of time then, weighs tested end impermeability situation by the pressure leakage rate.
The impermeability testing process of pressure relief valve is as above shown in Figure 5.Open air pump, precompressed air inlet solenoid valve cuts out the precompressed exhaust solenoid valve, opens electromagnetic pressure control valve, closes tested exhaust solenoid valve, measures the force value of pre-pressure side and tested end by digital module.When force value is higher than pressure set points 10kPa, close air pump and precompressed air inlet solenoid valve.Regulate pressure by the precompressed exhaust solenoid valve, make force value near pressure set points.When receive stop steering order after, stop controlled pressure.The variation of digital module force value then reflects the sealing of gas circuit.
(4) realization of communication function
Be illustrated in fig. 6 shown below, communication function comprises the communication of slave computer and host computer, the communication of slave computer and FPGA, the communication of slave computer and digital module; The communication of slave computer and host computer realizes that by the RS232 interface communication of slave computer and FPGA realizes that by the SPI interface communication of slave computer and digital module realizes by the RS232 interface.
Pressure relief valve calibrating verification control program:
Speed control communication event drives flow process, sees Fig. 7.
Speed control master routine function operational scheme is seen Fig. 8,
Receive tested precompressed value setting communication event driving flow process and see Fig. 9,
Receive tested precompressed value setting master routine function operational scheme and see Figure 10,
The debugging of pressure relief valve calibration equipment and checking
After the pressure relief valve calibration equipment was finished the debugging examination of dispatching from the factory, project team had also carried out substantive test research in the laboratory, the characteristic of device and the characteristic of pressure relief valve have been carried out comprehensive understanding, had also verified the reliability of device.Concrete grammar and data are as follows:
Reperformance test:
The device reperformance test is for the demo plant consistance of measurement result repeatedly, is the basic meter characteristic of device.Measuring method is that stable same measurand is taken multiple measurements, and the result meets the designing technique index.This device has carried out 15 independent measurements respectively to the pressure relief valve of 2 different definite values, and the result is respectively as following table 8,9 (units: kPa).Through test, verified that the repeatability of device adheres to specification.
Table 8 reperformance test-1
Standard deviation 0.616; Mean value 57.06
Table 9 reperformance test-2
Standard deviation 0.52; Mean value 81.9
Stability test:
The device stability test is the long-term consistency for the demo plant measurement result, also is the basic meter characteristic of device.Measuring method is that stable same measurand was taken multiple measurements in a period of time, and the result meets the designing technique index.This device has carried out 5 independent measurements respectively to the pressure relief valve of 2 different definite values in 2 months, the result is as follows respectively, through test, has verified that the stability of device adheres to specification.
Table 10 stability test data-1
Standard deviation 0.48; Mean value 58.9
Table 11 stability test data-2
Standard deviation 0.68; Mean value 81.7
The above only is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model design; can also make some improvements and modifications, these improvements and modifications also should be considered as in the protection domain of the present utility model.
Claims (10)
1. pressure relief valve calibration equipment, it comprises mechanical part and control system, it is characterized in that, described mechanical part comprises air pump, precompressed air inlet solenoid valve, pre-pressure side air-capacitor and electromagnetic pressure control valve link to each other pressure relief valve to be verified with electromagnetic pressure control valve, electromagnetic pressure control valve links to each other with precompressed air inlet solenoid valve by pre-pressure side air-capacitor, and precompressed air inlet solenoid valve links to each other with air pump.
2. a kind of pressure relief valve calibration equipment as claimed in claim 1 is characterized in that, described pre-pressure side air-capacitor links to each other with precompressed end pressure sensor.
3. a kind of pressure relief valve calibration equipment as claimed in claim 1 is characterized in that, described pre-pressure side air-capacitor links to each other with the precompressed exhaust solenoid valve.
4. a kind of pressure relief valve calibration equipment as claimed in claim 1 is characterized in that, described pressure relief valve to be verified links to each other with tested exhaust solenoid valve.
5. a kind of pressure relief valve calibration equipment as claimed in claim 1 is characterized in that, connects by general-purpose interface between each parts of described mechanical part.
6. a kind of pressure relief valve calibration equipment as claimed in claim 1, it is characterized in that, described control system is that four parts are formed, first is calibration module, second portion is the pressure relief valve detection module, third part is the impermeability detection module, and the 4th part is communication module, and four modules link to each other with program of lower computer respectively.
7. a kind of pressure relief valve calibration equipment as claimed in claim 6 is characterized in that, described calibration module is precompressed calibration and digital module calibration.
8. a kind of pressure relief valve calibration equipment as claimed in claim 6 is characterized in that, described pressure relief valve detection module is divided into pre-pressure-controlled, and operating pressure value three parts are read in pressure control.
9. a kind of pressure relief valve calibration equipment as claimed in claim 6 is characterized in that, described impermeability detection module is divided into pressure control and force value is uploaded two parts.
10. a kind of pressure relief valve calibration equipment as claimed in claim 6 is characterized in that, described communication module is divided into 232 communications and SPI communication two parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320154069 CN203132763U (en) | 2013-03-30 | 2013-03-30 | Pressure releasing valve verifying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320154069 CN203132763U (en) | 2013-03-30 | 2013-03-30 | Pressure releasing valve verifying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203132763U true CN203132763U (en) | 2013-08-14 |
Family
ID=48940735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320154069 Expired - Lifetime CN203132763U (en) | 2013-03-30 | 2013-03-30 | Pressure releasing valve verifying device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203132763U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278312A (en) * | 2013-03-30 | 2013-09-04 | 国家电网公司 | Method and device for verifying pressure relief valve of transformer |
-
2013
- 2013-03-30 CN CN 201320154069 patent/CN203132763U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278312A (en) * | 2013-03-30 | 2013-09-04 | 国家电网公司 | Method and device for verifying pressure relief valve of transformer |
| WO2014161303A1 (en) * | 2013-03-30 | 2014-10-09 | 国家电网公司 | Check method and device for pressure release valve of transformer |
| CN103278312B (en) * | 2013-03-30 | 2015-07-01 | 国家电网公司 | Method and device for verifying pressure relief valve of transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130814 |