CN103162919A - Downloading valve testing device and method - Google Patents
Downloading valve testing device and method Download PDFInfo
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- CN103162919A CN103162919A CN2011104352773A CN201110435277A CN103162919A CN 103162919 A CN103162919 A CN 103162919A CN 2011104352773 A CN2011104352773 A CN 2011104352773A CN 201110435277 A CN201110435277 A CN 201110435277A CN 103162919 A CN103162919 A CN 103162919A
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- solenoid valve
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Abstract
The invention provides a downloading valve testing device and method. The downloading valve testing device comprises an air processing unit, a compacting return circuit unit and an air-tight test return circuit unit which are connected sequentially. The air-tight test return circuit unit comprises a leakage detecting solenoid valve, an air discharge solenoid valve, a pressurization solenoid valve and a measuring air supply, the measuring air supply is connected with the compacting return circuit unit, and the leakage detecting solenoid valve, the air discharge solenoid valve and the pressurization solenoid valve are respectively connected with the measuring air supply. The downloading valve testing device can accurately control testing pressure and pressure maintaining time of a downloading valve and guarantees accuracy of reading.
Description
Technical field
The present invention relates to lower discharge valve test unit and method, be specifically related to a kind of tank car lower discharge valve tightness test device.
Background technology
Tank car make or maintenance whether all need to detect its lower discharge valve sealing property after completing qualified, method commonly used is that air-tight test detects at present, the impermeability detection is to pass into pressure gas and apply certain pressure in lower discharge valve housing or cavity particularly, keep certain hour, gather the parameters of lower discharge valve in this process, the parameter that obtains and reference parameter relatively judge the situation of lower discharge valve self.And the air-tight test process has related to the problem that the judgement lower discharge valve leaks and do not leak, existing lower discharge valve tightness test device adopts traditional mechanical system to detect, pressure and dwell time are not easy accurate control, smear suds, artificial reading, can introduce personal error, original proving installation accuracy of detection has much room for improvement.Existing tightness test device adopts the microcomputer control mode, accurately Control experiment pressure and dwell time, automatically calculates the pressure drop of packing stage.Summarize the experience voltage drop value of packing stage according to great number tested data, judge whether lower discharge valve leaks.
Summary of the invention
In order to solve existing technical matters in background technology, the present invention proposes a kind of lower discharge valve test unit, accurately control lower discharge valve test pressure and dwell time, guarantee accuracy of reading.
technical solution of the present invention is: a kind of lower discharge valve test unit, described test unit comprises air processing unit, compress circuit units and air-tight test circuit units, described air processing unit, compressing circuit units and air-tight test circuit units connects successively, it is characterized in that: described air-tight test circuit units comprises leak detection solenoid valve 9, exhaust solenoid valve 11, add pressure electromagnetic valve 18 and measure bellows chamber 23, described measurement bellows chamber 23 is connected with the compression circuit units, described leak detection solenoid valve 9, exhaust solenoid valve 11 be connected pressure electromagnetic valve 18 respectively with measure bellows chamber 23 and be connected.
Above-mentioned air-tight test circuit units also comprises steam jacket test solenoid valve 12 and the low pressure measurement solenoid valve 13 that is connected with measurement bellows chamber 23, described steam jacket test solenoid valve 12 and 13 parallel connections of low pressure measurement solenoid valve.
Symmetrical the first high pressure sensor 7 and the second high pressure sensors 10 of connecting of above-mentioned measurement bellows chamber 23, described steam jacket test solenoid valve 12 are connected with the low pressure measurement solenoid valve and are connected the first low pressure sensor 14 and the second low pressure sensor 16.
Above-mentioned the first low pressure sensor 14 and the second low pressure sensor 16 are separated by steam jacket test solenoid valve 12 and low pressure measurement solenoid valve 13 near a side of measuring bellows chamber 23.
Above-mentioned buffering bellows chamber 22 be connected bellows chamber 23 by one-way speed-regulating valve 2 be connected pressure electromagnetic valve 18 and connect.
The above-mentioned gas processing unit comprises safety valve 1 and the pneumatic triple piece 2 that is connected with safety valve 1.
Above-mentioned compression circuit units comprises pressure regulator valve 3, compresses bellows chamber 4, compresses bellows chamber sensor 5,3 position-5 way solenoid valve 6, the first high pressure sensor 7 and reservoir 8, described pressure regulator valve 3 connects respectively pneumatic triple piece 2 and compresses bellows chamber 4, described 3 position-5 way solenoid valve 6 is connected with compression bellows chamber 4, described reservoir 8 respectively with 3 position-5 way solenoid valve 6 be connected high pressure sensor 7 and be connected, arrange on described compression bellows chamber 4 and compress bellows chamber sensor 5, described compression bellows chamber 4 is connected with the 3 position-5 way solenoid valve by the second one-way speed-regulating valve 24 with reservoir 8 and is connected.
A kind of test method of lower discharge valve test unit is characterized in that: said method comprising the steps of:
1) measure bellows chamber 23 and connect simultaneously two high pressure sensors and two low pressure sensors, use separately respectively high pressure sensor and low pressure sensor when lower discharge valve high-pressure seal experiment and low pressure seal test, must not use with alternative, during high-pressure seal experiment, two low pressure sensor front ends increase solenoid valve and cut off, reach high-pressure seal experiment and low pressure seal and test the purpose that the sensor of different ranges used separates independent measurement, be convenient to reduce the measuring error that measuring element is introduced;
2) utilize outer bound pair to measure bellows chamber 23 pressurization actings, make the gas compression in it, gas temperature raises simultaneously;
3) pressure gas in bellows chamber 23 to be measured and measurement bellows chamber equality of temperature, enter the dwell time section after pressure stability, begins to gather pressure;
4) test in the dwell time section by soap bubble method;
Above-mentioned steps 3) concrete steps are:
4.1) be coated with soap lye on the surface of lower discharge valve;
4.2) be recorded in the dwell time section without the corresponding voltage drop value of visible bubble in bubble generation;
4.3) the empirical value contrast of summarizing of voltage drop value that computer acquisition is calculated and soap race method, if the empirical value that the voltage drop value that computer acquisition calculates is summarized less than soap race method is qualified, otherwise defective;
Above-mentioned empirical value is 5kPa～8kPa.
Advantage of the present invention is:
1) compressing the loop increases pressure regulator valve, realizes that snap-in force is adjustable continuously;
2) increase the first low pressure sensor and the second low pressure sensor, can measure more accurately the low pressure seal test pressure, reduce the measuring error that measuring element is introduced.When high-pressure seal experiment or Shell test, cut off by low-voltage solenoid valve or steam jacket test solenoid valve, protection the first low pressure sensor and the second low pressure sensor are in high-pressure seal experiment or Shell test process, the low pressure exhaust solenoid valve is opened, and communicates with external atmosphere pressure all the time;
3) 3 position-5 way solenoid valve band Median Function can hold during power off, and is safer;
4) by great number tested data, summarize the pressure drop empirical value of packing stage, this pressure drop empirical value leaks and the criterion of not leaking as lower discharge valve.Avoided personal error, test pressure can accurately be controlled, and the dwell time can guarantee.
Description of drawings
Fig. 1 is structural representation of the present invention;
Embodiment
Referring to Fig. 1, lower discharge valve test unit of the present invention by air processing unit, compresses circuit units and air-tight test circuit units and forms.Air processing unit comprises safety valve 1, pneumatic triple piece 2; Safety valve 1 is connected with pneumatic triple piece 2; Compressing circuit units comprises pressure regulator valve 3, compresses bellows chamber 4, compresses bellows chamber sensor 5,3 position-5 way solenoid valve 6, the first high pressure sensor 7, reservoir 8; The air-tight test circuit units by leak detection solenoid valve 9, the second high pressure sensor 10, exhaust solenoid valve 11, steam jacket test solenoid valve 12, low pressure measurement solenoid valve 13, the first low pressure sensor 14, low pressure exhaust solenoid valve 15, the second low pressure sensor 16, the first retaining valve 17, add pressure electromagnetic valve 18, the first one-way speed-regulating valve 19, flowmeter 20, buffering bellows chamber sensor 21, buffering bellows chamber 22, measure bellows chamber 23, the second one-way speed-regulating valve 24, the second retaining valve 25.
Air processing unit, compress circuit units and the air-tight test circuit units connects successively, measure bellows chamber 23 and compress circuit units and is connected, hunt leak solenoid valve 9, exhaust solenoid valve 11 and be connected pressure electromagnetic valve 18 and be connected with measurement bellows chamber 23 respectively.Steam jacket test solenoid valve 12 is connected with the low pressure measurement solenoid valve and is measured bellows chamber 23 and be connected, and steam jacket is tested solenoid valve 12 and 13 parallel connections of low pressure measurement solenoid valve.
Measure symmetrical the first high pressure sensor 7 and the second high pressure sensors 10 of connecting of bellows chamber 23, steam jacket test solenoid valve 12 is connected with the low pressure measurement solenoid valve and is connected the first low pressure sensor 14 and the second low pressure sensor 16.The first low pressure sensor 14 and the second low pressure sensor 16 are separated by steam jacket test solenoid valve 12 and low pressure measurement solenoid valve 13 near a side of measuring bellows chamber 23.Buffering bellows chamber 22 and be connected bellows chamber 23 by one-way speed-regulating valve 2 be connected pressure electromagnetic valve 18 connections.
Pressure regulator valve 3 connects respectively pneumatic triple piece 2 and compresses bellows chamber 4,3 position-5 way solenoid valve 6 is connected with compression bellows chamber 4, reservoir 8 respectively with 3 position-5 way solenoid valve 6 be connected high pressure sensor 7 and be connected, compress to arrange on bellows chamber 4 and compress bellows chamber sensor 5, compress bellows chamber 4 and are connected with the 3 position-5 way solenoid valve by the second one-way speed-regulating valve 24 with reservoir 8 and are connected.
Test unit Import computer measuring technique of the present invention, high-potting is separated independent measurement with low pressure test (LPT), can reduce measuring error, high pressure sensor directly is arranged in to be measured on bellows chamber 23, low pressure sensor has solenoid valve with measuring between bellows chamber 23 (one or two can) partition.
During high-potting, the first low pressure sensor 14 and the second low pressure sensor 16 are cut off by solenoid valve, measuring bellows chamber 23 is not communicated with the first low pressure sensor 14 and the second low pressure sensor 16, and keep the first low pressure sensor 14 and the second low pressure sensor 16 to communicate with external atmosphere pressure, guarantee that low pressure sensor can outrange.
During low pressure test (LPT), the first low pressure sensor 14 and the second low pressure sensor 16 communicate with measuring bellows chamber 23, and sensor and external atmosphere pressure are cut off, and begin to gather low pressure.
A kind of test method of lower discharge valve test unit adopts lower discharge valve micro-control test unit, by pressure decline method, through lot of experiments, finds out the voltage stabilizing time of lower discharge valve air-tight test and the allowable pressure drop of packing stage, comprises the following steps:
1) measure high pressure sensor and the low pressure sensor that bellows chamber 23 connects different ranges, the low pressure sensor front end increases solenoid valve, can cut off the protection low pressure sensor when high-pressure seal experiment;
2) utilize outer bound pair to measure bellows chamber 23 actings, make the gas compression in it, temperature raises;
3) pressure gas in bellows chamber 23 to be measured and measurement bellows chamber equality of temperature, begin to gather pressure after pressure stability; Enter the dwell time section;
4) test in the dwell time section by soap bubble method;
4.1) be coated with soap lye on the surface of lower discharge valve;
4.2) be recorded in the dwell time section without the corresponding voltage drop value of visible bubble in bubble generation;
4.3) with the voltage drop value and the empirical value contrast that obtain, empirical value is 5kPa～8kPa, if voltage drop value is qualified less than empirical value, otherwise defective.
Test principle is: during air-tight test, outer bound pair is measured the air work in bellows chamber 23, and the gas compression temperature raises, and when reaching test pressure, gaseous tension has fluctuation, and measures the pressure gas in bellows chamber 23
With measure not equality of temperature of bellows chamber 23, the process of a stable equality of temperature is arranged.Begin to gather pressure after pressure stability.Pressure is by dynamically the time period to stable state is the voltage stabilizing time.
The allowable pressure drop of packing stage refers to satisfies the prerequisite of not leaking, and produces corresponding minimum pressure drop value without visible bubble in bubble by soap bubble method in the dwell time section.This voltage drop value is empirical value, gets by lot of experiments.Finally judge that by this empirical value whether qualified the lower discharge valve air-tight test is, if think qualified less than this empirical value, otherwise defective.
Claims (10)
1. lower discharge valve test unit, described test unit comprises air processing unit, compress circuit units and air-tight test circuit units, described air processing unit, compressing circuit units and air-tight test circuit units connects successively, it is characterized in that: described air-tight test circuit units comprises leak detection solenoid valve (9), exhaust solenoid valve (11), add pressure electromagnetic valve (18) and measure bellows chamber (23), described measurement bellows chamber (23) is connected with the compression circuit units, described leak detection solenoid valve (9), exhaust solenoid valve (11) be connected pressure electromagnetic valve (18) respectively with measure bellows chamber (23) and be connected.
2. lower discharge valve test unit according to claim 1, it is characterized in that: described air-tight test circuit units also comprises steam jacket test solenoid valve (12) and the low pressure measurement solenoid valve (13) that is connected with measurement bellows chamber (23), described steam jacket test solenoid valve (12) and low pressure measurement solenoid valve (13) parallel connection.
3. lower discharge valve test unit according to claim 2, it is characterized in that: symmetrical the first high pressure sensor (7) and the second high pressure sensor (10) of connecting of described measurement bellows chamber (23), described steam jacket test solenoid valve (12) is connected 13 with the low pressure measurement solenoid valve) connection the first low pressure sensor (14) and the second low pressure sensor (16).
4. lower discharge valve test unit according to claim 3 is characterized in that: described the first low pressure sensor (14) and the second low pressure sensor (16) test solenoid valve (12) near a side of measuring bellows chamber (23) by steam jacket and low pressure measurement solenoid valve (13) is separated.
5. lower discharge valve test unit according to claim 4 is characterized in that: described buffering bellows chamber 22 be connected bellows chamber (23) by one-way speed-regulating valve (2) be connected pressure electromagnetic valve (18) and connect.
6. according to claim 1-5 arbitrary described lower discharge valve test units, it is characterized in that: described air processing unit comprises safety valve (1) and the pneumatic triple piece (2) that is connected with safety valve (1).
7. lower discharge valve test unit according to claim 6, it is characterized in that: described compression circuit units comprises pressure regulator valve (3), compress bellows chamber (4), compress bellows chamber sensor (5), 3 position-5 way solenoid valve (6), the first high pressure sensor (7) and reservoir (8), described pressure regulator valve (3) connects respectively pneumatic triple piece (2) and compresses bellows chamber (4), described 3 position-5 way solenoid valve (6) is connected with compression bellows chamber (4), described reservoir (8) respectively with 3 position-5 way solenoid valve (6) be connected high pressure sensor (7) and be connected, arrange on described compression bellows chamber (4) and compress bellows chamber sensor (5), described compression bellows chamber (4) is connected 6 by the second one-way speed-regulating valve (24) with the 3 position-5 way solenoid valve with reservoir (8)) be connected.
8. the test method of a lower discharge valve test unit as claimed in claim 1 is characterized in that: said method comprising the steps of:
1) measure high pressure sensor and the low pressure sensor that bellows chamber 23 connects different ranges, the low pressure sensor front end increases solenoid valve, can cut off the protection low pressure sensor when high-pressure seal experiment;
2) utilize outer bound pair to measure bellows chamber (23) acting, make the gas compression in it, temperature raises;
3) pressure gas in bellows chamber to be measured (23) and measurement bellows chamber equality of temperature, begin to gather pressure after pressure stability; Enter the dwell time section;
4) test in the dwell time section by soap bubble method;
9. the test method of lower discharge valve test unit according to claim 8, it is characterized in that: concrete steps described step 4) are:
4.1) be coated with soap lye on the surface of lower discharge valve;
4.2) be recorded in the dwell time section without the corresponding voltage drop value of visible bubble in bubble generation;
4.3) with the voltage drop value and the empirical value contrast that obtain, if voltage drop value is qualified less than empirical value, otherwise defective;
10. the test method of lower discharge valve test unit according to claim 9, it is characterized in that: described empirical value is 5kPa～8kPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110435277.3A CN103162919B (en) | 2011-12-16 | 2011-12-16 | A kind of lower discharge valve experimental rig and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110435277.3A CN103162919B (en) | 2011-12-16 | 2011-12-16 | A kind of lower discharge valve experimental rig and method thereof |
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| CN103162919A true CN103162919A (en) | 2013-06-19 |
| CN103162919B CN103162919B (en) | 2016-09-07 |
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Citations (6)
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| JP2002039905A (en) * | 2000-07-24 | 2002-02-06 | Pentafu Kk | Apparatus and method for testing leakage resistance of piping |
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| CN201025464Y (en) * | 2006-11-23 | 2008-02-20 | 中国北车集团西安车辆厂 | Automatic testing device for respiratory secure valve performance |
| CN102012302A (en) * | 2010-11-24 | 2011-04-13 | 山东万事达专用汽车制造有限公司 | Comprehensive air pressure test bed for vehicle-mounted steel tank |
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| CN202420796U (en) * | 2011-12-16 | 2012-09-05 | 西安轨道交通装备有限责任公司 | Downloading valve testing device |
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2011
- 2011-12-16 CN CN201110435277.3A patent/CN103162919B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002039905A (en) * | 2000-07-24 | 2002-02-06 | Pentafu Kk | Apparatus and method for testing leakage resistance of piping |
| KR20030081702A (en) * | 2002-04-12 | 2003-10-22 | 한국항공우주산업 주식회사 | Apparatus to use air pressure testing for a tube |
| CN201025464Y (en) * | 2006-11-23 | 2008-02-20 | 中国北车集团西安车辆厂 | Automatic testing device for respiratory secure valve performance |
| CN102012302A (en) * | 2010-11-24 | 2011-04-13 | 山东万事达专用汽车制造有限公司 | Comprehensive air pressure test bed for vehicle-mounted steel tank |
| CN202041357U (en) * | 2011-04-27 | 2011-11-16 | 霍山东科科技开发有限公司 | Performance detecting device for pressure protective valve of rapid train |
| CN202420796U (en) * | 2011-12-16 | 2012-09-05 | 西安轨道交通装备有限责任公司 | Downloading valve testing device |
Non-Patent Citations (1)
| Title |
|---|
| 程迪: "微机控制铁路罐车阀类试验台研究", 《中国优秀硕士学位论文全文数据库》, 15 September 2006 (2006-09-15) * |
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| CN103162919B (en) | 2016-09-07 |
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Address after: Three Town Weiyang District 710086 Shaanxi city of Xi'an Province Patentee after: CRRC XI'AN CO., LTD. Address before: 710086 Xi'an City, Shaanxi Province town of three Patentee before: Xi'an Railway Transportation Equipment Co., Ltd. |
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