CN102735409B - Automatic detecting device for air tightness of liquefied petroleum gas cylinder - Google Patents
Automatic detecting device for air tightness of liquefied petroleum gas cylinder Download PDFInfo
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- CN102735409B CN102735409B CN201210239369.9A CN201210239369A CN102735409B CN 102735409 B CN102735409 B CN 102735409B CN 201210239369 A CN201210239369 A CN 201210239369A CN 102735409 B CN102735409 B CN 102735409B
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Abstract
The invention discloses an automatic detecting device for air tightness of a liquefied petroleum gas cylinder. The conventional automatic detecting device is both low in detection efficiency and poor in security because of the manual control in the prior art. According to the automatic detecting device, a pressure reducing valve is selected according to the specification of a gas cylinder; the nitrogen flows from a nitrogen cylinder to the liquefied petroleum gas cylinder to be tested by opening a corresponding high-pressure normally-closed solenoid valve; a high-precision pressure sensor and a flowmeter begin acquiring the data and transmitting the detection result into a PLC (Programmable Logic Controller) to be processed; when a calculated flow rate is achieved approximately, a PLC control unit controls a regulating valve to reduce the opening for precise control; when an appointed pressure is achieved, the electromagnetic valve is closed for pressure maintaining; if the requirements are met, the air tightness is qualified; otherwise, the air tightness is unqualified; after the test is accomplished, the test can be continued or ended optionally. Compared with a traditional water dipping test, the automatic detecting device is more stable and efficient.
Description
Technical field
The present invention relates generally to pressure and flow detection technical field, is specifically related to a kind of liquefied petroleum gas steel cylinder impermeability automatic detection device.
Background technology
Liquefied petroleum gas steel cylinder is a kind of typical pressure vessel, obtain using more and more widely, so the problem of its safe operation also causes social concern day by day in industry-by-industry and people's daily life.Because liquefied petroleum gas steel cylinder working environment changes greatly, in use need repeatedly repeatedly to fill medium, make liquefied petroleum gas steel cylinder according to relevant criterion, not accept check timely under many circumstances.This situation is obvious especially in civil LPG cylinder.This has just buried hidden danger for the security incident of liquefied petroleum gas steel cylinder.
The security incident hidden danger of liquefied petroleum gas steel cylinder has a variety of, but main potential safety hazard is the impermeability due to steel cylinder in use to be reduced, make petroleum gas escape into environment around, when the concentration of petroleum gas reaches explosion limits, run into the accident of blasting after naked light, cause huge loss.
In GB GB8334-1999 (liquefied petroleum gas steel cylinder periodic inspection and evaluation), stipulated the bubble-tight method of inspection-submerging test of liquefied petroleum gas steel cylinder, during test, steel cylinder pressure is 2.1Mpa, dwell time must not be less than 1min, and in pressure maintaining period, tensimeter has not allowed back to fall phenomenon.But the method mainly relies on manually and controls, and not only detection efficiency is low, and poor stability, thereby is not widely used.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of liquefied petroleum gas steel cylinder impermeability automatic detection device is provided.
A kind of liquefied petroleum gas steel cylinder impermeability of the present invention automatic detection device consists of nitrogen cylinder, hand valve, reduction valve, high pressure normally closed solenoid valve, flow control valve, gas meter, high-precision pressure sensor, normally open solenoid valve, weldless steel tube.Nitrogen cylinder is connected with the first manual valve inlet end by weldless steel tube, the first manual valve outlet port end is connected with the first reduction valve inlet end, the first reduction valve endpiece is connected with the inlet end of the second reduction valve and the first high pressure normally closed solenoid valve by pipe adapter, the second reduction valve endpiece is connected with the inlet end of the 3rd reduction valve and the second high pressure normally closed solenoid valve by pipe adapter, the 3rd reduction valve endpiece presses normally closed solenoid valve inlet end to be connected by pipe adapter and third high, the second high pressure normally closed solenoid valve, third high press normally closed solenoid valve endpiece respectively with the 4th high pressure normally closed solenoid valve, the endpiece of the normally closed magnet valve of the 5th electric high pressure is connected, the 4th, the 5th high pressure normally closed solenoid valve is oppositely to install, the endpiece of the first high pressure normally closed solenoid valve, the inlet end of the inlet end of the 4th high pressure normally closed solenoid valve and the 5th high pressure normally closed solenoid valve is connected with flow control valve inlet end by pipe adapter simultaneously, after flow control valve, installing gas flow is taken into account high-precision pressure sensor successively, after high-precision pressure sensor, connect tested liquefied petroleum gas steel cylinder, on the weldless steel tube between high-precision pressure sensor and tested liquefied petroleum gas steel cylinder, by pipeline connecting parts, two-way gas exhaust piping is installed, normally open solenoid valve and the second hand valve are installed respectively on two-way gas exhaust piping and are controlled the break-make of gas exhaust piping.
Beneficial effect: the invention provides and meet the liquefied petroleum gas steel cylinder impermeability new detecting method that GB requires.Adopt high-precision pressure sensor and flow sensor, obtained more accurate pressurize information, improved the accuracy detecting, by the logic control of PLC, improved the automatization level that steel cylinder impermeability detects.By the Real time dynamic display of man-machine interface, improved the intuitive of testing result.Compare with traditional submerging test, more stable, efficient.
Accompanying drawing explanation
Fig. 1 is pipe system structural drawing of the present invention;
Fig. 2 is fundamental diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, provide embodiments of the invention, describe technical scheme of the present invention in detail.
As shown in Figure 1, a kind of liquefied petroleum gas steel cylinder impermeability of the present invention automatic detection device presses normally closed solenoid valve 8, the 4th high pressure normally closed solenoid valve 9, the 5th high pressure normally closed solenoid valve 10, flow control valve 11, gas meter 12, high-precision pressure sensor 13, normally open solenoid valve 14, the second hand valve 15 and weldless steel tube to form by nitrogen cylinder 1, the first hand valve 2, the first reduction valve 3, the second reduction valve 4, the first high pressure normally closed solenoid valve 5, the 3rd reduction valve 6, the second high pressure normally closed solenoid valve 7, third high.Nitrogen cylinder 1 is connected with the first hand valve 2 inlet ends by weldless steel tube, the first hand valve 2 endpiece are connected with the first reduction valve 3 inlet ends, the first reduction valve 3 endpiece are connected with the inlet end of the second reduction valve 4 and the first high pressure normally closed solenoid valve 5 by pipe adapter, the second reduction valve 4 endpiece are connected with the inlet end of the 3rd reduction valve 6 and the second high pressure normally closed solenoid valve 7 by pipe adapter, the 3rd reduction valve 6 endpiece press normally closed solenoid valve 8 inlet ends to be connected by pipe adapter and third high, the second high pressure normally closed solenoid valve 7, third high press normally closed solenoid valve 8 endpiece respectively with the 4th high pressure normally closed solenoid valve 9, the endpiece of the normally closed magnet valve 10 of the 5th electric high pressure is connected, the 4th, the 5th high pressure normally closed solenoid valve is oppositely to install, the endpiece of the first high pressure normally closed solenoid valve 5, the inlet end of the inlet end of the 4th high pressure normally closed solenoid valve 9 and the 5th high pressure normally closed solenoid valve 10 is connected with flow control valve 11 inlet ends by pipe adapter simultaneously, installing gas flowmeter 12 and high-precision pressure sensor 13 successively after flow control valve 11, after high-precision pressure sensor 13, connect tested liquefied petroleum gas steel cylinder 16, on the weldless steel tube between high-precision pressure sensor 13 and tested liquefied petroleum gas steel cylinder 16, by pipeline connecting parts, two-way gas exhaust piping is installed, normally open solenoid valve 14 and the second hand valve 15 are installed respectively on two-way gas exhaust piping and are controlled the break-make of gas exhaust piping.
As shown in Figure 2, when carrying out the detection of liquefied petroleum gas steel cylinder impermeability, first open nitrogen cylinder and hand valve, according to tested steel cylinder specification, open high pressure normally closed solenoid valve.If in the pressure relief ranges and accuracy rating of the first reduction valve 3, open the first high pressure normally closed solenoid valve 5; If in the pressure relief ranges scope and accuracy rating of the second reduction valve 4, open the second high pressure normally closed solenoid valve 7 and the 4th high pressure normally closed solenoid valve 9; If in the pressure relief ranges and accuracy rating of the 3rd reduction valve 6, open third high and press normally closed solenoid valve 8 and the 5th high pressure normally closed solenoid valve 10.After corresponding high pressure normally closed solenoid valve is opened, nitrogen flow to tested liquefied petroleum gas steel cylinder by nitrogen cylinder, high-precision pressure sensor and gas meter start image data and testing result are sent into PLC and process, when approaching calculated flow rate, PLC control module regulating and controlling valve reduces aperture and accurately controls, when reaching specified pressure, shut electromagnetic valve carries out pressurize, according to GB GB8334-1999 (liquefied petroleum gas steel cylinder periodic inspection and evaluation), stipulate, if met the requirements, impermeability is qualified, and as undesirable, impermeability is defective.After detection completes, can select to continue test or finish test.
This device, meeting completely on the basis of GB GB8334-1999 (liquefied petroleum gas steel cylinder periodic inspection and evaluation), is built test unit platform, has improved accuracy and automatization level that steel cylinder impermeability detects.By the Real time dynamic display of man-machine interface, improved the intuitive of testing result.Compare with traditional submerging test, more stable, efficient.
Claims (1)
1. a liquefied petroleum gas steel cylinder impermeability automatic detection device, it is characterized in that: by nitrogen cylinder, hand valve, reduction valve, high pressure normally closed solenoid valve, flow control valve, gas meter, high-precision pressure sensor, normally open solenoid valve, weldless steel tube forms, nitrogen cylinder is connected with the first manual valve inlet end by weldless steel tube, the first manual valve outlet port end is connected with the first reduction valve inlet end, the first reduction valve endpiece is connected with the inlet end of the second reduction valve and the first high pressure normally closed solenoid valve by pipe adapter, the second reduction valve endpiece is connected with the inlet end of the 3rd reduction valve and the second high pressure normally closed solenoid valve by pipe adapter, the 3rd reduction valve endpiece presses normally closed solenoid valve inlet end to be connected by pipe adapter and third high, the second high pressure normally closed solenoid valve, third high press normally closed solenoid valve endpiece respectively with the 4th high pressure normally closed solenoid valve, the endpiece of the normally closed magnet valve of the 5th electric high pressure is connected, i.e. the 4th high pressure normally closed solenoid valve, the 5th high pressure normally closed solenoid valve is oppositely to install, the endpiece of the first high pressure normally closed solenoid valve, the inlet end of the inlet end of the 4th high pressure normally closed solenoid valve and the 5th high pressure normally closed solenoid valve is connected with flow control valve inlet end by pipe adapter simultaneously, after flow control valve, installing gas flow is taken into account high-precision pressure sensor successively, after high-precision pressure sensor, connect tested liquefied petroleum gas steel cylinder, on the weldless steel tube between high-precision pressure sensor and tested liquefied petroleum gas steel cylinder, by pipeline connecting parts, two-way gas exhaust piping is installed, normally open solenoid valve and the second hand valve are installed respectively on two-way gas exhaust piping and are controlled the break-make of gas exhaust piping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210239369.9A CN102735409B (en) | 2012-07-11 | 2012-07-11 | Automatic detecting device for air tightness of liquefied petroleum gas cylinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210239369.9A CN102735409B (en) | 2012-07-11 | 2012-07-11 | Automatic detecting device for air tightness of liquefied petroleum gas cylinder |
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| CN102735409A CN102735409A (en) | 2012-10-17 |
| CN102735409B true CN102735409B (en) | 2014-10-15 |
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| CN201210239369.9A Expired - Fee Related CN102735409B (en) | 2012-07-11 | 2012-07-11 | Automatic detecting device for air tightness of liquefied petroleum gas cylinder |
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| CN103175659B (en) * | 2013-02-04 | 2015-05-27 | 李连清 | Technological method for testing natural gas cylinders |
| CN109470432B (en) * | 2018-12-24 | 2024-08-27 | 珠海西格膜生物技术有限公司 | Tightness detector and application method thereof |
| CN113588183B (en) * | 2021-06-30 | 2023-06-02 | 江苏民生重工有限公司 | Be applied to nitrogen gas circulating device of low temperature gas bottle production line |
| CN115235707A (en) * | 2022-06-27 | 2022-10-25 | 陕汽淮南专用汽车有限公司 | Controllable jar body air tightness test pressure test device |
| CN116479223A (en) * | 2023-06-25 | 2023-07-25 | 江苏金色工业炉股份有限公司 | Box-type multi-purpose furnace production line matched pre-vacuumizing high-temperature tempering furnace |
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Granted publication date: 20141015 Termination date: 20160711 |