CN102797943B - Vacuumizing technology for vacuum low-temperature thermal insulation pipeline - Google Patents
Vacuumizing technology for vacuum low-temperature thermal insulation pipeline Download PDFInfo
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- CN102797943B CN102797943B CN201210316527.6A CN201210316527A CN102797943B CN 102797943 B CN102797943 B CN 102797943B CN 201210316527 A CN201210316527 A CN 201210316527A CN 102797943 B CN102797943 B CN 102797943B
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Abstract
The invention provides vacuumizing technology for a vacuum low-temperature thermal insulation pipeline, which is as follows: when the low-temperature thermal insulation pipeline is vacuumized, nitrogen gas is used for replacing the air in the pipeline so as to reduce moisture and other foreign substances in the vacuum interlayer to the greatest extent, achieve a higher vacuum degree and reduce the cold loss of the low-temperature liquid. The vacuumizing technology for a vacuum low-temperature thermal insulation pipeline satisfies the large-scale production of vacuum low-temperature thermal insulation pipes and the requirements of simultaneously vacuumizing a plurality of vacuum pipes.
Description
Technical field
The present invention designs a kind of vacuum low-temperature heat insulation tube road evacuation process, particularly relates to a kind of technique using hot nitrogen replacing process to vacuumize to realize vacuum low-temperature heat insulation tube road.
Background technology
The liquefied gas at low temp such as liquid oxygen, liquid nitrogen and liquefied natural gas are carried mainly through vacuum low-temperature heat insulation tube, vacuum low-temperature heat insulation tube is made up of interior pipe, outer tube and multilayer insulant, in interlayer, multilayer insulant is for being composited, to reduce radiant heat transfer, and interlayer is pumped into high vacuum state, to reduce convection heat transfer' heat-transfer by convection, with the isolation of low thermal conductivity material between inner and outer pipes, to reduce solid heat transfer, thus interior pipe loss of refrigeration capacity is controlled to bottom line, fully meet the long distance delivery such as cryogenic liquid.Layer vacuum directly determines the cryogenic property of vacuum low-temperature heat insulation tube, it is the key factor reducing evaporation loss, and the vacuum of vacuum low-temperature heat insulation tube is then crucial depends on the technique vacuumized, reduce the content of the moisture and other field trashes etc. of vacuum interlayer to greatest extent, higher vacuum can be obtained, reduce cryogenic liquid refrigerating loss; For meeting the large-scale production of vacuum low-temperature heat insulation tube, the technique vacuumized also will meet can simultaneously to the requirement that several vacuum tube vacuumizes.
In the prior art, when vacuumizing, directly carrying out with the high-vacuum pump group connected, by the continuous operation of pump group, meeting the requirements of vacuum.Because liquid medium is difficult to thoroughly be extracted out under the absorption affinity effect of pump, and the impurity such as the grease being attached to material surface can not be sucked out substantially.Therefore, the residual moisture in interlayer, the foreign material such as grease cannot extract totally.In use, these materials can gasify or discharge gas, thus reduce layer vacuum, increase vacuum low-temperature heat insulation tube evaporation loss.
Summary of the invention
For the defect existed in prior art, technical scheme of the present invention is proposed.The invention provides a kind of vacuum low-temperature heat insulation tube road evacuation process.Described technique comprises the following steps:
Step one, vacuum tube to be taken out is taken out mouth be connected with vacuum-pumping pipeline, helium leak test is carried out until qualified to vacuum-pumping pipeline;
Step 2, treating that vacuum-pumping tube internal tube inserts multiple stainless steel heating rod, interior pipe two ends aluminum foil and adhesive tape is sealed, and heating rod, for being connected in parallel, adopts temperature controller to control described heating rod;
Step 3, in cold-trap, add liquid nitrogen, connect the heating of heating rod power supply, setting heating-up temperature is preset temperature, and the inner and outer pipes interlayer of startup vacuum pump set to vacuum tube continues to vacuumize;
Step 4, when described interlayer temperature reaches preset temperature, nitrogen displacement is carried out to interlayer, first by vacuum orifice valve closing, then vacuum pump set is shut down; The nitrogen of heating is connected with vacuum line, and nitrogen inlet place arranges a valve and Pressure gauge, opens the valve at nitrogen inlet place, when the Pressure gauge numerical value of import department maintain stable numerical value constant time, close nitrogen inlet place valve;
Step 5, closedown import department valve opened vacuum pumping pump after 45 minutes, opened vacuum orifice valve and continued to vacuumize, after reaching predetermined vacuum level in vacuum tube and requiring, stop vacuumizing;
Step 6, every 3 hours repeat step 3-step 5, nitrogen is always replaced number of times and is no less than 5 times.
Preferably, the heating-up temperature of heating rod that controls of temperature controller and preset temperature error are less than 5 degree.
Owing to present invention employs hot nitrogen displacement method vacuum pumping technology, reduce the content of the moisture of vacuum interlayer and other field trashes etc. to greatest extent, obtain higher vacuum, reduce cryogenic liquid refrigerating loss.Meet the large-scale production of vacuum low-temperature heat insulation tube, the technique vacuumized can meet simultaneously to the requirement that several vacuum tube vacuumizes.
Detailed description of the invention
Below in conjunction with the present invention one instantiation, the present invention is explained in more detail.
A kind of vacuum low-temperature heat insulation tube road evacuation process.Described technique comprises the following steps:
Step one, vacuum tube to be taken out is taken out mouth be connected with vacuum-pumping pipeline, helium leak test is carried out until qualified to vacuum-pumping pipeline;
Step 2, treating that vacuum-pumping tube internal tube inserts multiple stainless steel heating rod, interior pipe two ends aluminum foil and adhesive tape is sealed, and heating rod, for being connected in parallel, adopts temperature controller to control described heating rod;
Step 3, in cold-trap, add liquid nitrogen, connect the heating of heating rod power supply, setting heating-up temperature is preset temperature, starts the inner and outer pipes interlayer of vacuum pump set to vacuum tube and continues to vacuumize, and wherein the rear difference between actual temperature and preset temperature of heating is no more than 5 degree;
Step 4, when described interlayer temperature reaches preset temperature, nitrogen displacement is carried out to interlayer, first by vacuum orifice valve closing, then vacuum pump set is shut down; The nitrogen of heating is connected with vacuum line, and nitrogen inlet place arranges a valve and Pressure gauge, opens the valve at nitrogen inlet place, when the Pressure gauge numerical value of import department maintain stable numerical value constant time, close nitrogen inlet place valve;
Step 5, closedown import department valve opened vacuum pumping pump after 45 minutes, opened vacuum orifice valve and continued to vacuumize, after reaching predetermined vacuum level in vacuum tube and requiring, stop vacuumizing;
Step 6, every 3 hours repeat step 3-step 5, it is 5 times that nitrogen always replaces number of times.
Above embodiment further illustrates of the present invention, and those skilled in the art are that above-mentioned explanation is not limited to protection scope of the present invention with being to be understood that.
Claims (1)
1. a vacuum low-temperature heat insulation tube road evacuation process, described technique comprises the following steps:
Step one, vacuum tube to be taken out is taken out mouth be connected with vacuum-pumping pipeline, helium leak test is carried out until qualified to vacuum-pumping pipeline;
Step 2, treating that vacuum-pumping tube internal tube inserts multiple stainless steel heating rod, interior pipe two ends aluminum foil and adhesive tape is sealed, and heating rod, for being connected in parallel, adopts temperature controller to control described heating rod;
Step 3, in cold-trap, add liquid nitrogen, connect the heating of heating rod power supply, setting heating-up temperature is preset temperature, and the inner and outer pipes interlayer of startup vacuum pump set to vacuum tube continues to vacuumize;
Step 4, when described interlayer temperature reaches preset temperature, nitrogen displacement is carried out to interlayer, first by vacuum orifice valve closing, then vacuum pump set is shut down; The nitrogen of heating is connected with vacuum line, and nitrogen inlet place arranges a valve and Pressure gauge, opens the valve at nitrogen inlet place, when the Pressure gauge numerical value of import department maintain stable numerical value constant time, close nitrogen inlet place valve;
Step 5, closedown import department valve opened vacuum pumping pump after 45 minutes, opened vacuum orifice valve and continued to vacuumize, after reaching predetermined vacuum level in vacuum tube and requiring, stop vacuumizing;
Step 6, every 3 hours repeat step 3-step 5, it is 5 times that nitrogen always replaces number of times;
Heating-up temperature and the preset temperature error of the heating rod that described temperature controller controls are less than 5 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210316527.6A CN102797943B (en) | 2012-08-31 | 2012-08-31 | Vacuumizing technology for vacuum low-temperature thermal insulation pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210316527.6A CN102797943B (en) | 2012-08-31 | 2012-08-31 | Vacuumizing technology for vacuum low-temperature thermal insulation pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102797943A CN102797943A (en) | 2012-11-28 |
| CN102797943B true CN102797943B (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210316527.6A Expired - Fee Related CN102797943B (en) | 2012-08-31 | 2012-08-31 | Vacuumizing technology for vacuum low-temperature thermal insulation pipeline |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047535A (en) * | 2012-12-21 | 2013-04-17 | 山东宏达科技集团有限公司 | Interlayer vacuumizing method for cryogenic vessel and special device thereof |
| CN104358999B (en) * | 2014-11-07 | 2017-07-04 | 宜昌江峡船用机械有限责任公司 | Pearly-lustre skerry low-temperature (low temperature) vessel heats vacuum extractor and method |
| CN108498163B (en) * | 2018-04-24 | 2020-07-28 | 海杰亚（北京）医疗器械有限公司 | Vacuum interlayer treatment process for split connection cryoablation needle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201836016U (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 | Evacuating device for low-temperature gas bottle interlayer |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3781598B2 (en) * | 1999-12-28 | 2006-05-31 | 日清紡績株式会社 | Deformation method of vacuum heat insulating material, fixing method of vacuum heat insulating material, freezer / refrigerated container and heat insulating box |
| CN1223785C (en) * | 2003-08-17 | 2005-10-19 | 河南中原绿能高科有限责任公司 | Vacuumizing method and device for replacing air in interlayer of liquefied natural gas storage tank |
| CN100554682C (en) * | 2006-02-14 | 2009-10-28 | 中集车辆（集团）有限公司 | Vacuum pumping method and device thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201836016U (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 | Evacuating device for low-temperature gas bottle interlayer |
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Granted publication date: 20150325 Termination date: 20180831 |