CN103471764A - Device for testing vacuum degree of interlayer of automotive liquefied natural gas cylinder - Google Patents
Device for testing vacuum degree of interlayer of automotive liquefied natural gas cylinder Download PDFInfo
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- CN103471764A CN103471764A CN2013104431045A CN201310443104A CN103471764A CN 103471764 A CN103471764 A CN 103471764A CN 2013104431045 A CN2013104431045 A CN 2013104431045A CN 201310443104 A CN201310443104 A CN 201310443104A CN 103471764 A CN103471764 A CN 103471764A
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- vacuum degree
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- liquefied natural
- interlayer
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- Examining Or Testing Airtightness (AREA)
Abstract
The invention provides a device for testing the vacuum degree of an interlayer of an automotive liquefied natural gas cylinder. The device for testing the vacuum degree of the interlayer of the automotive liquefied natural gas cylinder comprises a vacuum pump, a vacuum degree tester and an integrated interface. The integrated interface consists of a drawing device, a push-pull piston, a vacuum pump connecting flange, a vacuum degree tester silicon pipe interface and a vacuum degree tester flange interface, wherein three gas outlet holes with the 9-20mm hole diameter are distributed on the side wall of the drawing device, and the side wall of the drawing device is respectively communicated with the push-pull piston, the vacuum degree tester silicon pipe interface and the vacuum degree tester flange interface. Due to the design of the integrated interface, the inner cavity of the device is very small, the calculation shows that a space of the testing device is about one thousandth of the volume of the gas cylinder interlayer, and the different between the vacuum degree in a normal-temperature state and the vacuum degree in a low-temperature state is tiny and can be basically ignored. The device for testing the vacuum degree of the interlayer of the automotive liquefied natural gas cylinder is a special testing device which is high in testing accuracy and does not produce adverse influence on the low-temperature vacuum degree in the cylinder.
Description
Technical field
The present invention relates to a kind of proving installation, particularly a kind of device that Vehicular liquefied natural gas bottle layer vacuum is tested, belong to metering field.
Background technology
Vehicular liquefied natural gas cylinder is called again welded insulated gas cylinder, mainly by inner bag and shell, formed, thermal insulation is the outer surface of liner at this gas cylinder, adopt the fiber of multiple wraps, the asbestos paper wrapping, then add in the welded insulated gas cylinder interlayer multiple tracks adiabatic (being called for short heat insulation) that adopts pumping high vacuum to form, the cryogenic liquid of the liquefied natural gas (LNG) loaded at cylinder liner like this could can not gasify with the rising of external temperature, evaporation, so the vacuum tightness in Vehicular liquefied natural gas cylinder interlayer is leading indicator, vacuum tightness in Vehicular liquefied natural gas cylinder interlayer is up to standard, all safe and reliable, as bad as the vacuum tightness in Vehicular liquefied natural gas cylinder interlayer, do not reach the regulation of standard, be stored in the rock gas of cylinder liner, along with outside temperature variation, will gasify at once, evaporation, and supercharging, so two safety valve of the Vehicular liquefied natural gas cylinder of loading onto at once will take-off, rock gas overflows, running into burning things which may cause a fire disaster will burn, blast.
Vehicular liquefied natural gas cylinder manufacturing plant is all the frock of system when producing, inner bag heating to its Vehicular liquefied natural gas cylinder, the interlayer pumping high vacuum, all to be placed in large-scale drying box, adopt external heat in hot air circulation, one group of case, want at least 12, maximum 46, Vehicular liquefied natural gas cylinder is hot in drying box, to interlayer vacuum-pumping, and adopt inert gas replacement several times, then also want under cold conditions the interlayer pumping high vacuum, reach Vehicular liquefied natural gas cylinder, the specialized range of layer vacuum all can, general not separately to each only Vehicular liquefied natural gas cylinder measure the vacuum tightness in its interlayer, to control the layer vacuum of one group of gas cylinder on system.
Although the Vehicular liquefied natural gas cylinder of some that also have manufacturing plant, in the time must testing the vacuum tightness of interlayer to a small amount of other Vehicular liquefied natural gas cylinder, because of without special purpose device, can only take interim measures, its method is mainly to be connected stop valve with rubber tube between the interlayer drawing mouth of vacuum pump adapting pipe and Vehicular liquefied natural gas bottle, three-way pipe and vacuum degree measuring instrument, the two ends of described three-way pipe are connected with the drawing mouth of the gentle bottle clip layer of stop valve respectively through rubber tube, the stop valve other end is connected with the vacuum pump adapting pipe, the other end of three-way pipe is connected with the sensor of vacuum degree measuring instrument.During test, after connecting by above-mentioned measure, first open stop valve, open vacuum pump and vacuum degree measuring instrument, the inner chamber of stop valve, rubber tube and three-way pipe is vacuumized, and survey its vacuum tightness with vacuum degree measuring instrument, when vacuum tightness reaches standard code, close stop valve, open the interlayer drawing mouth of Vehicular liquefied natural gas bottle, still with this vacuum degree measuring instrument, can measure the vacuum tightness in this gas cylinder interlayer.But 2 distinct disadvantage have been done like this, (1) measuring accuracy is low, the internal diameter of the pipeline connected because of stop valve is too thick, 30mm as about as the internal diameter of rubber tube, the interior cavity length of stop valve and three-way pipe is also had an appointment about 150mm, and the pipeline that stop valve connects is from the have an appointment distance of 300mm of cylinder interface, so just make the volume of cavity over 60 cubic centimetres, the vacuum tightness of the normal temperature state in pipeline runs into the vacuum tightness under low-temperature condition in Vehicular liquefied natural gas cylinder and can neutralize, the larger neutralization of volume of cavity more, just more can not correctly reflect the vacuum tightness in its real interlayer, (2) normal temperature be neutralized enters in the gas cylinder interlayer of low temperature, can reduce the cryogenic vacuum degree in Vehicular liquefied natural gas cylinder interlayer.So the proving installation of current interim connection can cause harmful effect to the vacuum tightness in Vehicular liquefied natural gas cylinder interlayer, be not suitable for continuing to use.
Summary of the invention
The objective of the invention is in order to overcome the weak point of above-mentioned existing proving installation, design a kind of simple and reasonable, easy to use, can with the gas cylinder interlayer in the cavity volume of vacuum tightness neutralization very little, measuring accuracy is high, the integrated Vehicular liquefied natural gas bottle sandwich layer vacuum degree tester of pipeline and joint.
Vehicular liquefied natural gas bottle sandwich layer vacuum degree tester of the present invention, comprise vacuum pump, vacuum degree measuring instrument, with integrated interface, described integrated interface is by draw-off gear, the push-and-pull piston, the vacuum pump joint flange, vacuum degree measuring instrument silicone tube interface, the vacuum degree measuring instrument flange-interface forms, 3 ventholes that aperture is 9～20mm distribute on the sidewall of described draw-off gear, wherein, venthole and the air admission hole UNICOM that is packed in the push-and-pull piston on this aperture, another two ventholes respectively with the vacuum degree measuring instrument silicone tube interface and the vacuum degree measuring instrument flange-interface UNICOM that are packed on aperture, the vacuum pump joint flange is packed on the cock body of push-and-pull piston and communicates with plunger shaft.
Above-mentioned push-and-pull piston comprises cock body, piston, pull bar and O-ring seal, and the pull bar rear end is provided with handle, and the pull bar front end enters plunger shaft through O-ring seal and is connected with piston, and piston is contained between plunger shaft and air admission hole.
Vehicular liquefied natural gas bottle sandwich layer vacuum degree tester of the present invention, because the device of push-and-pull piston and drawing gas cylinder is integrated design, so the space in cavity is very small, calculating according to gas cylinder interlayer volume, the space of this vehicle gas cylinder (LNG) proving installation is about per mille of gas cylinder interlayer volume, adds after use that vacuum pump extracts in pick-up unit in small lacuna under vacuum tightness, normal temperature state 1 * 10
-2pa, when opening the vehicle gas cylinder interlayer, test the vacuum tightness of vacuum tightness in its interlayer, normal temperature state and the vacuum tightness of low-temperature condition differs very small, can ignore substantially.Be that a kind of measuring accuracy to the vacuum tightness in Vehicular liquefied natural gas cylinder interlayer is high, can not produce dysgenic Special testing device to the cryogenic vacuum degree in bottle again.
The accompanying drawing explanation
Fig. 1 is a kind of structural representation of the integrated interface in proving installation of the present invention;
Fig. 2 is that the A of Fig. 1 is to structural representation;
Fig. 3 is a kind of use constitutional diagram in the present invention.
Embodiment
Referring to accompanying drawing 1～3,1 in figure is draw-off gear, the 2,6, the 8th, and 3 ventholes on draw-off gear, the 3rd, vacuum degree measuring instrument flange-interface, the 4th, the handle of draw-off gear, the 5th, the drawing mouth of draw-off gear, the 7th, vacuum degree measuring instrument silicone tube interface, the 9th, the cock body of push-and-pull piston, the 10th, piston, the 11st, plunger shaft, the 12nd, vacuum pump joint flange, the 13rd, pull bar, the 14th, O-ring seal, the 15th, handle, the 16th, silicone tube interface type vacuum degree measuring instrument, the 17th, vacuum pump.
Vehicular liquefied natural gas bottle sandwich layer vacuum degree tester of the present invention, comprise vacuum pump 17, vacuum degree measuring instrument, with integrated interface, described integrated interface is by draw-off gear 1, the push-and-pull piston, vacuum pump joint flange 12, vacuum degree measuring instrument silicone tube interface 7, vacuum degree measuring instrument flange-interface 3 forms, 3 ventholes 2 that aperture is 9～20mm distribute on the sidewall of described draw-off gear 1, 6 and 8, wherein, venthole 8 and the air admission hole UNICOM that is packed in the push-and-pull piston on this aperture, another two ventholes 6 and 2 respectively with the vacuum degree measuring instrument silicone tube interface 5 and vacuum degree measuring instrument flange-interface 3 UNICOMs that are packed on aperture, vacuum pump joint flange 12 is packed on the cock body 9 of push-and-pull piston and communicates with plunger shaft 11.
Above-mentioned push-and-pull piston comprises cock body 9, piston 10, pull bar 13 and O-ring seal, and pull bar 13 rear ends are provided with handle 15, and pull bar 13 front ends enter plunger shaft 11 through O-ring seal 14 and are connected with piston 10, and piston 10 is contained between plunger shaft and air admission hole.
Before use, drawing mouth 5 sealing shrouds of draw-off gear 1 are stuck on Vehicular liquefied natural gas bottle interlayer vacuum-pumping sealing obturating plug, the screw thread spinning of the drawing bar front end in drawing mouth 5 is in the threaded hole of sealing-plug; As use silicone tube interface type vacuum degree measuring instrument, open the sealing bolt on vacuum degree measuring instrument silicone tube interface 7, by the sensor spinning of the vacuum degree measuring instrument of silicone tube interface 16 on vacuum degree measuring instrument silicone tube interface 7, as shown in Figure 3; As use flange-interface formula vacuum degree measuring instrument, and open the gland bonnet on vacuum degree measuring instrument flange-interface 3, flange-interface formula vacuum degree measuring instrument sensor is contained on vacuum degree measuring instrument flange-interface 3 and gets final product, in figure, do not draw; The flange-interface of the exhaust tube of vacuum pump 17 is connected with vacuum pump joint flange 12, as shown in Figure 3.During use, one hand steered good cock body 9, another is held handle 15 and pulls back, piston 10 is withdrawn in plunger shaft 11 and opens piston, open vacuum pump 17 and vacuum degree measuring instrument 16, air in draw-off gear and 3 cavitys such as venthole is evacuated, and survey its vacuum tightness with vacuum degree measuring instrument 16, when vacuum tightness reaches standard code, driving handle 15 forward, piston 10 is shifted onto between plunger shaft and air admission hole and closure piston, pull again the handle 4 of draw-off gear 1 and open the sealing-plug of the interlayer drawing mouth of Vehicular liquefied natural gas bottle, still with this vacuum degree measuring instrument, can measure the vacuum tightness in this gas cylinder interlayer.After having tested, then with the handle 4 of draw-off gear 1, sealing-plug is pushed back on the interlayer sealing obturating plug of Vehicular liquefied natural gas bottle.
Claims (2)
1. a Vehicular liquefied natural gas bottle sandwich layer vacuum degree tester, comprise vacuum pump, vacuum degree measuring instrument, characterized by further comprising integrated interface, described integrated interface is by draw-off gear, the push-and-pull piston, the vacuum pump joint flange, vacuum degree measuring instrument silicone tube interface, the vacuum degree measuring instrument flange-interface forms, 3 ventholes that aperture is 9～20mm distribute on the sidewall of described draw-off gear, wherein, venthole and the air admission hole UNICOM that is packed in the push-and-pull piston on this aperture, another two ventholes respectively with the vacuum degree measuring instrument silicone tube interface and the vacuum degree measuring instrument flange-interface UNICOM that are packed on aperture, the vacuum pump joint flange is packed on the cock body of push-and-pull piston and communicates with plunger shaft.
2. Vehicular liquefied natural gas bottle sandwich layer vacuum degree tester as claimed in claim 1, it is characterized in that described push-and-pull piston comprises cock body, piston, pull bar and O-ring seal, the pull bar rear end is provided with handle, the pull bar front end enters plunger shaft through O-ring seal and is connected with piston, and piston is contained between plunger shaft and air admission hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013104431045A CN103471764A (en) | 2013-09-26 | 2013-09-26 | Device for testing vacuum degree of interlayer of automotive liquefied natural gas cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013104431045A CN103471764A (en) | 2013-09-26 | 2013-09-26 | Device for testing vacuum degree of interlayer of automotive liquefied natural gas cylinder |
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| CN103471764A true CN103471764A (en) | 2013-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013104431045A Pending CN103471764A (en) | 2013-09-26 | 2013-09-26 | Device for testing vacuum degree of interlayer of automotive liquefied natural gas cylinder |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5044279A (en) * | 1989-07-21 | 1991-09-03 | Daikin Industries, Ltd. | Connector for a bomb and a method for sucking liquid in a bomb |
| CN201344287Y (en) * | 2008-10-20 | 2009-11-11 | 温晋轩 | Vacuum valve of continuous evacuation device |
| CN201837502U (en) * | 2010-11-04 | 2011-05-18 | 江苏省特种设备安全监督检验研究院常州分院 | Low-temperature gas cylinder sandwich layer vacuum degree tester |
| CN201973248U (en) * | 2011-02-10 | 2011-09-14 | 中国工程物理研究院化工材料研究所 | Hollow valve plug and powder material forming system |
| CN202532172U (en) * | 2012-03-13 | 2012-11-14 | 江苏省特种设备安全监督检验研究院常州分院 | Quick-detection connector for vacuum degree of interlayer of low-temperature gas cylinder |
| CN202561135U (en) * | 2012-05-10 | 2012-11-28 | 上海开维喜阀门集团有限公司 | Vacuumizing and nitrogen charging protective device of oxygen valve |
| CN203011618U (en) * | 2012-12-18 | 2013-06-19 | 青岛瑞丰气体有限公司 | Low-temperature gas cylinder interlayer vacuum degree detection device |
| CN203502166U (en) * | 2013-09-26 | 2014-03-26 | 张家港韩中深冷科技有限公司 | Device for testing vacuum degree of interlayer of automotive liquefied natural gas cylinder |
-
2013
- 2013-09-26 CN CN2013104431045A patent/CN103471764A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5044279A (en) * | 1989-07-21 | 1991-09-03 | Daikin Industries, Ltd. | Connector for a bomb and a method for sucking liquid in a bomb |
| CN201344287Y (en) * | 2008-10-20 | 2009-11-11 | 温晋轩 | Vacuum valve of continuous evacuation device |
| CN201837502U (en) * | 2010-11-04 | 2011-05-18 | 江苏省特种设备安全监督检验研究院常州分院 | Low-temperature gas cylinder sandwich layer vacuum degree tester |
| CN201973248U (en) * | 2011-02-10 | 2011-09-14 | 中国工程物理研究院化工材料研究所 | Hollow valve plug and powder material forming system |
| CN202532172U (en) * | 2012-03-13 | 2012-11-14 | 江苏省特种设备安全监督检验研究院常州分院 | Quick-detection connector for vacuum degree of interlayer of low-temperature gas cylinder |
| CN202561135U (en) * | 2012-05-10 | 2012-11-28 | 上海开维喜阀门集团有限公司 | Vacuumizing and nitrogen charging protective device of oxygen valve |
| CN203011618U (en) * | 2012-12-18 | 2013-06-19 | 青岛瑞丰气体有限公司 | Low-temperature gas cylinder interlayer vacuum degree detection device |
| CN203502166U (en) * | 2013-09-26 | 2014-03-26 | 张家港韩中深冷科技有限公司 | Device for testing vacuum degree of interlayer of automotive liquefied natural gas cylinder |
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Application publication date: 20131225 |