CN205533072U - Vacuum pipe evacuator - Google Patents
Vacuum pipe evacuator Download PDFInfo
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- CN205533072U CN205533072U CN201620225477.4U CN201620225477U CN205533072U CN 205533072 U CN205533072 U CN 205533072U CN 201620225477 U CN201620225477 U CN 201620225477U CN 205533072 U CN205533072 U CN 205533072U
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 74
- 238000010438 heat treatment Methods 0.000 claims abstract description 38
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 35
- 210000005239 tubule Anatomy 0.000 claims description 38
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- 238000006073 displacement reaction Methods 0.000 claims description 25
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- 238000012856 packing Methods 0.000 claims description 15
- 239000001307 helium Substances 0.000 claims description 5
- 229910052734 helium Inorganic materials 0.000 claims description 5
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 5
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical group N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
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- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to a vacuum pipe evacuator, including circulation heating air supply system, high vacuum vacuator group, vacuum pumping system, nitrogen gas replacement return circuit and the closed loop headtotail pipeline of managing to find time, circulation heating air supply system includes pressure fan in electric heater, the centrifugation, heating concentrated pipe and stop valve, heating concentrated pipe one side is connected with the bypass valve, high vacuum vacuator group regulates including vacuum unit, pipeline vacuum valve and pipeline vacuum, vacuum pumping system is including manage to find time along separate routes vacuum valve, the concentrated pipe of managing to find time, the pipeline vacuum valve and manage to find time the concentrated pipe and regulate of managing to find time, nitrogen gas replacement return circuit includes nitrogen gas replacement vacuum valve and nitrogen cylinder, closed loop manage to find time headtotail pipeline the manage to find time pipeline and the valve of managing to find time, high vacuum vacuator group and nitrogen gas replacement return circuit link to each other with vacuum pumping system respectively. The utility model discloses with low costs, easy and simple to handle, stability is good, the function is advanced, easy control, work efficiency height, multitask, flexibility, satisfiedly respectively designs vacuum pipe evacuation under the operating mode.
Description
Technical field
This utility model relates to a kind of vacuum pipe processing means, particularly relates to a kind of vacuum pipe evacuator.
Background technology
Recently as the low-temperature deep liquid (LNG, LO2, LN2, LAr, LH2, LHe etc.) the extensive application in social each field, the accumulation heat preserving mode (such as pearlite insulation, polyurethane heat-insulation etc.) of conventional pipelines equipment is because cold damage is big, cryogenic liquid rate of gasification is high, make final economic loss very big, gradually substituted by vacuum pipe.Cryogenic vacuum pipeline uses high vacuum multiple layer heat insulation wound insulation technology, preferable cold insulation effect is reached because of the cold damage that its transmission medium is extremely low, and its heat-proof quality is good, evaporation rate is little, mezzanine space is little, need the space taken the least, add the superiority of energy-saving and environmental protection, so being widely used in the technological design of ultralow temperature device.
Cryogenic vacuum pipeline is two-layer pipeline, is made up of inner tube, outer tube and multilayer insulant.Wherein interlayer is heat insulation layer, multilayer insulant be composited, to reduce radiant heat transfer；In pipeline, adiabator is flame retardant type, it is adaptable to liquid oxygen pipeline, but flame retardant type adiabator is costly.Inner tube is service pipe, and outer tube is pillar, and main material all selects S30408 stainless steel material.Inner and outer pipes forms the mezzanine space closed through combined set, and interlayer is pumped into high vacuum state, to reduce convection heat transfer' heat-transfer by convection；Between inner and outer pipes, nearly 200 DEG C pipeline temperature difference low thermal conductivity materials are isolated, and to reduce solid heat transfer, thus inner tube loss of refrigeration capacity are controlled to bottom line, fully meet the long distance delivery such as cryogenic liquid (LNG, LO2, LN2, LAr, LH2, LHe).
The connected mode of vacuum pipe is broadly divided into flange form and welding type two kinds, and the selecting of connected mode mainly selects to determine according to field condition and user.The vacuum multi-layer insulation pipeline that domestic manufacturers provides at present the most mostly uses and is welded to connect, and the Subzero valve in system and pipeline are also adopted by being welded to connect.If vacuum insulated piping uses the Flange joint of antivacuum thermal insulation with valve, the adiabatic benefit that then vacuum multi-layer insulation cryogenic piping brings can be connected flange and leak hot counteracting greatly, this is irrational in design, it is anticipated that the cryogenic piping of welding can obtain further to be promoted and application.
One important step of high-vacuum insulation pipeline manufacture is pipe sandwich evacuation, which determines the date of delivery of product and the quality of finished product.The evacuation of pipe sandwich is to be connected by the fine pumping unit of vacuum valve with pump-line and mechanical pump, diffusion pump composition to carry out.The main purpose of evacuation is: first extracted out by the gas of interlayer air, is then reduced to by the material outgassing in pipe sandwich in the range of permission, and promotes adsorbent to activate, to ensure to have good vacuum insulation performance in vacuum pipe is during the life-span all the time.
One aggregative indicator of reflection cryogenic vacuum pipeline workmanship is heat-proof quality, to its objectives of examination mainly sealing vacuum and vacuum interlayer glomus mosseae.High vacuum multiple layer heat insulation vacuum is 0.01Pa.
For guaranteeing the vacuum of vacuum pipe chuck, vacuum pipe manufacture is compared with conventional pressure vessel manufacturing, and its technology content, manufacturability are higher.The design of vacuum pipe inner tube is considered as thermal (temperature difference) stress, and inner tube pipeline is provided with the inner and outer pipes relative displacement that bellow-type expansion causes because of thermal (temperature difference) stress；Inner tube butt weld 100% ray detection, each angle welding 100% Liquid penetrant testing between inner and outer pipe and interlayer；Inner tube is in addition to carrying out pressure test by drawing, and inner tube, interlayer are both needed to do helium mass spectrum leak detection, it is to avoid even lose because a variety of causes causes the leakage of inner tube or outer tube to make the vacuum life of interlayer shorten.
In sum in addition to each factor affecting vacuum pipe vacuum life, evacuator design whether advanced person, inspection, evacuation technique are the most reasonable, production efficiency, the control of product quality of vacuum pipe there is is very important effect, is also the key factor weighing vacuum pipe vacuum insulation performance indications.
Former vacuum pipe evacuator is bulky, and the heaviest, installs operation cumbersome.The space taken greatly due to volume is the biggest, thus limits vacuum pipe and evacuates the design of mouth location, cannot evacuation with outer tube protection shrouding distance≤200mm once evacuate mouth.Constrain the short vacuum pipe design of minor diameter, length and manufacture.
Former evacuator evacuates mouth with vacuum pipe and is connected relatively difficult, evacuator and evacuation pipeline palpus synchronous axial system during connection, it is difficult to individually operated palpus other people assist to install.Additionally rotating tightened position uncertain, after evacuation mouth screws sometimes, the position evacuating pipeline connection port is just contrary with vacuum pump set connector position, the most only Mobile vacuum pipeline location.Can only move vacuum pump set for long pipe road, the connection so evacuating pipeline is wasted time and energy, and easily causes the leakage evacuating pipeline by force if docking.
Former evacuator once can only take out a vacuum pipe, and work efficiency is the lowest.Time in evacuation process if it find that evacuation pipeline or vacuum pipe have leakage, can not individually carry out operation of hunting leak, vacuum pump set reorganization leak detection flow process can only be closed can carry out, the cycle of very time-consuming pipeline evacuation is longer, evacuates, replaces, cannot accomplish seamless link between each job task such as leak detection and freely switch.Original device is disposable to vacuum pipe sealed knot, once just utilize device evacuation again after sealed knot.If must evacuation again, that can only destroy after former pipeline vacuum evacuation again.Original device also exists the most fatal weakness, and when, after vacuum pipe once sealed knot, just measuring the vacuum of pipeline, also how cannot judge pipeline vacuum degree, the vacuum insulation performance quality of pipeline is the most just difficult to ensure that.
In the past vacuum tube completed installation, and vacuum tube has certain resting period, the reason the such as additionally transport of vacuum tube midway is jolted, shaken, collision, and vacuum tube vacuum-degree also can be made to lose efficacy.Because of cannot measurement of vacuum, in installation process, the vacuum of this vacuum tube the most uncertain is the most qualified, often with going by sheer good luck to install.Device context test run once certain root vacuum tube vacuum-degree leakage failure, condenses outside pipeline when cryogenic liquid flows through this vacuum tube, even can freeze time serious.Due to previous frock cannot measurement of vacuum, also cannot evacuation again.The most whole project is out of service, changes this section of underproof vacuum pipe.This not only time-consuming, consumptive material also delay the schedule of whole project, bring certain negative effect the most also to the product quality of enterprise.
Utility model content
This utility model is in order to solve defect and deficiency present in above-mentioned prior art, provide a kind of low cost, easy and simple to handle, good stability, function are advanced, easy to control, work efficiency is high, multitask, flexibility, meet the evacuator of vacuum pipe evacuation under each design conditions.
The technical solution of the utility model: a kind of vacuum pipe evacuator, evacuates unit, pumped vacuum systems, nitrogen displacement loop and closed loop evacuation system connecting line including circulating-heating supply air system, fine vacuum,
Described circulating-heating supply air system includes electric heater, centrifugal Middle pressure draught fan, heating collecting tubule and stop valve, and described heating collecting tubule side connects bypass valve；
Described fine vacuum evacuates unit and includes vacuum pump set, pipeline vacuum valve and pipeline vacuum gauge；
Described pumped vacuum systems includes evacuating branch vacuum valve, evacuation collecting tubule, evacuation pipeline vacuum valve and evacuating collecting tubule regulating；
Described nitrogen displacement loop includes nitrogen displacement vacuum valve and nitrogen cylinder；
Described closed loop evacuation system connecting line evacuates pipeline and evacuates valve；
Described fine vacuum evacuates unit and is connected with pumped vacuum systems respectively with nitrogen displacement loop；Described pumped vacuum systems evacuates mouth by closed loop evacuation system connecting line with vacuum pipe and is connected；
Vacuum pipe inner tube is connected with circulating-heating supply air system near the side evacuating mouth.
Preferably, described vacuum pump set is connected with evacuating collecting tubule by pipeline vacuum valve and evacuation pipeline vacuum valve, and described nitrogen cylinder is connected with evacuating collecting tubule by nitrogen displacement vacuum valve.
Preferably, evacuate mouth with vacuum pipe bottom described evacuation valve and be connected, evacuate valve wherein side and be connected with evacuating pipeline one end；Evacuate the pipeline other end and be connected with evacuating branch vacuum valve.
Preferably, the air outlet of described centrifugal Middle pressure draught fan connects electric heater, and the air outlet of electric heater connects heating collecting tubule, and vacuum pipe inner tube is connected by the hot-blast outlet of stop valve with heating collecting tubule near the side evacuating mouth.
Preferably, described electric heater includes housing, electrothermal tube, air inlet, air outlet, electrothermal tube wiring end cover and housing heat-insulation layer, being provided with axial bimetallic thermometer between electric heater and heating collecting tubule, described fine vacuum evacuates to connect on unit peripheral hardware vacuum valve and helium mass spectrometer leak detector.
Preferably, described evacuation valve includes valve body, the valve rod being arranged in valve body and the sealing-plug being arranged on stem bottom and is arranged on the evacuation pipeline interface channel of valve body side, described evacuation pipeline interface channel is vertically arranged with valve body, some upper sealing rings and packing ring it is provided with between described body top and valve rod, described upper sealing ring and packing ring are compressed by trim ring, and described valve body, trim ring and valve rod are compressed by clamp nut.
Preferably, described body base is provided with a cooperation vacuum pipe and evacuates the vacuum pipe evacuated joint of mouth, is locked by a locking nut between described vacuum pipe evacuated joint and valve body；It is provided with gasket seal between described valve body and vacuum pipe evacuated joint, between described sealing-plug and vacuum pipe evacuated joint, is provided with some lower seal.
Preferably, described valve stem top is provided with a valve handle, and described valve handle and valve rod junction are provided with a spring washer；Described valve stem top is provided with the handwheel linkage section coordinating valve handle, described valve handle center is rear fixing connection on handwheel linkage section, described stem bottom is provided with the sealing-plug fastener head of fitted seal plug, and described sealing-plug is enclosed within sealing-plug fastener head and is fastenedly connected.
Preferably, the quantity of described upper sealing ring and packing ring is four, and each upper sealing ring is transferred and is provided with a packing ring coordinating upper sealing ring, and the quantity of described lower seal is two；Being provided with the compression step of Passscheiben inside described valve body, uppermost upper sealing ring contacts with trim ring, and nethermost packing ring contacts with compressing step.
The vacuum-pumping method of a kind of vacuum pipe evacuator, comprises the steps:
1) close bypass valve, open the stop valve of heating collecting tubule；Opening centrifugal Middle pressure draught fan, when wind speed reaches certain flow, wind speed switchs automatically opens output electrical heating signal, starts three groups of electric-heating control systems and makes electrothermal tube heat；Vacuum inner tube starts the cycle over air-supply heating, and vacuum pipe other end outlet temperature controls between 70 DEG C～80 DEG C；
2) close evacuation pipeline vacuum valve, close nitrogen displacement vacuum valve；Open pipeline vacuum valve and evacuate pipeline vacuum valve, starting fine vacuum unit and start evacuation；
3) when the vacuum evacuating collecting tubule reaches setting, open evacuation valve, open evacuation branch vacuum valve and start vacuum pipe evacuation, and record the Start Date of evacuation, time and ambient temperature；
4) laser heating air-supply is evacuated to evacuate collecting tubule and regulates the vacuum measured by TC2 when reaching 4Pa, the record date of evacuation, time and ambient temperature；
5) closing down vacuum pump set, blind off a line vacuum valve and evacuation pipeline vacuum valve, slow unlatching nitrogen displacement vacuum valve is filled with nitrogen to vacuum pipe and replaces, cuts out nitrogen when pressure reaches 0.01MPa and replace vacuum valve；
6) open fine vacuum unit after 20 minutes, open pipeline vacuum valve and evacuate pipeline vacuum valve, continuing evacuation；Repetitive cycling evacuation, nitrogen charging 3 times, every minor tick 40 minutes；
7) vacuum pipe laser heating, evacuation about about one week, regulates when the vacuum measured by TC2 reaches sealed knot vacuum level requirements when evacuation collecting tubule and carries out sealed knot；
8) during vacuum pipe sealed knot, press down on valve rod, sealing-plug is imported vacuum pipe evacuated joint and completes vacuum sealing；
9) closing evacuation branch vacuum valve, rotary valve rod counterclockwise is separated with sealing-plug by valve rod and valve rod is pulled up, and unclamps tightening nut and evacuates mouth disengaging with vacuum pipe, completes the sealed knot of vacuum pipe vacuum；
10) when, after the whole sealed knot of all vacuum, blinding off a line vacuum valve and evacuate pipeline vacuum valve, close down vacuum pump set, the record date of vacuum pipe sealed knot, time and ambient temperature.
This utility model breaches the mentality of designing of conventional any frock evacuation, is possible not only to efficiency and the vacuum of every vacuum tube comprehensive, that all the period of time monitors the evacuation of whole evacuation pipeline.And when, after vacuum tube sealed knot, still may utilize this evacuation frock and measure the vacuum of vacuum pipe.Reversibility surmounted at present any frock, thoroughly solve conventional vacuum pipe once just cannot the defect of measurement of vacuum after sealed knot.
This utility model uses the mechanism of cryogenic vacuum pipeline evacuation dexterously, utilizes electric heater heating and relies on centrifugal middle hush blower fan air-supply, forming thermal cycle wind and heat vacuum tube within adding pipe line.Overcoming have to be with investing the drawback that vacuum pipe is heated by drying room huge, that facility requirements is higher in cryogenic piping manufacturing process.It is play the same tune on different musical instruments wonderful that vacuum pipe uses the heating of thermal cycle wind to heat with drying room.Inner tube is filled with dry hot-air just can make inner tube temperature raise, because multilayer insulant is wrapped on the outer wall of inner tube, heat is delivered to mezzanine space to adiabator by the outer wall of inner tube, makes multilayer insulant temperature raise, and molecular motion is accelerated gas and is easy to be drawn out of.Additionally the higher venting speed being also beneficial to multilayer insulant of temperature is accelerated, thus shortens the cycle of evacuation.
Evacuation valve of the present utility model and vacuum pipe evacuate mouth can convenient, be connected reliably, it is ensured that evacuation process and evacuate any link, not by factors such as vacuum pipe vibrations, displacement or pipeline rollovers, when causing evacuation, evacuate the leakage of connecting line；Can not be limited by any vacuum tube orientation and position, ensure that evacuating valve orientation in office is all mutually 90 ° of positions with evacuation pipeline, evacuate pipeline interface channel and be linked to be a straight line with evacuating pipeline, it can be ensured that evacuate connecting line and be difficult to leakage, improve and evacuate the reliability that pipeline connects；
This utility model evacuation valve evacuates mouth with vacuum pipe, evacuation valve all uses the snap joint of easy mounting or dismounting to be connected with evacuating pipeline, makes evacuation valve be connected flexible, convenient, fast with vacuum pipe evacuation mouth, evacuation valve with evacuating pipeline.Valve body installs restriction and the restriction that unrestricted vacuum pipe connects, determine as long as on-the-spot vacuum pipe evacuates mouth position, the connector of valve body aligns with it and screws, then with snap joint, evacuation valve is joined directly together with vacuum tube, it is the most convenient to install, and the sealing that snap joint connects is the most reliable.
The most any caliber, the vacuum tube of any length, be suitable for from pipeline foaming shrouding distance >=50mm entirely as long as meeting vacuum pipe evacuation mouth.
This utility model can connect 10 vacuum pipes, can the most disposably evacuate 10 vacuum tubes simultaneously.Solve a conventional vacuum pump set and can only once take out the limitation of a vacuum tube.Substantially reduce evacuated time, improve the efficiency of vacuum tube evacuation, solve bulk article production efficiency problem.During this Fixture Design, the evacuation pipeline to each branch road is provided with vacuum valve, in continuous print evacuation process, realize that vacuum remains unchanged always, when being difficult to reach qualified index, exclusive method can be taked to be shut by the vacuum valve of suspected leak vacuum pipe, if now vacuum measuring gauge index rises, so that it may judge that this vacuum line has leakage.Individually this vacuum line must be carried out leak test, without affecting the evacuation of other vacuum tube because of certain root leakage of vacuum pipes.
Vacuum pipe evacuates by this utility model continuously, repeatedly displacement, inspection, operation index, vacuum tube must be carried out sealed knot, it is ensured that the requirement of its vacuum after vacuum qualified.Sealed knot sealing device is to affect the one procedure that vacuum pipe quality is the most key, it is contemplated that the qualified index of vacuum pipe vacuum and the particularity of structure, and the design of sealed knot sealing device takes the safety of dual-seal.In valve body, moveable sealing-plug and the evacuated joint inner seal of vacuum pipe, devise twice linear sealing.Sealing-plug and evacuation mouth tip side face seal, be designed with flat seal.This dual structure Seal Design makes leakage of vacuum pipes probability be greatly reduced, and substantially increases the service life of vacuum tube.
This utility model can also evacuate, and heats, replaces, hunts leak, detects, the multi-task parallel such as examination, also can switch inter-related task at any time according to single vacuum tube progress situation, and other vacuum tubes are not made process and impact；Flexible design is additionally embodied in system capability transmutability, such as: heating power, heating-up temperature, adds hot blast rate and implements adjustable automatically controlling, and (evacuate, hunt leak, the examine) ability that produces is 1 ~ 10 adjustable (simultaneity factor also supports dilatation).
This utility model can comprehensive, the efficiency of all the period of time monitoring whole evacuation pipeline evacuation and the vacuum of every vacuum tube.When, after vacuum tube sealed knot, still may utilize this evacuation frock and measure the vacuum of vacuum pipe.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model；
Fig. 2 is the structural representation evacuating valve and vacuum pipe assembling in this utility model；
null1. vacuum pipe in figure，2. it is centrifuged Middle pressure draught fan，3. electric heater，4. axial bimetallic thermometer，5. heating collecting tubule，6. evacuate branch vacuum valve，7. evacuate collecting tubule，8. nitrogen displacement vacuum valve，9. nitrogen cylinder，10. vacuum pump set，11. pipeline vacuum valves，12. pipeline vacuum gauges，13. evacuate pipeline vacuum valve，14. evacuate collecting tubule regulates，15. stop valves，16. bypass valves，17. evacuate pipeline，18. evacuate valve，19. peripheral hardware vacuum valves，20. helium mass spectrometer leak detectors，21. valve handles，22. spring washers，23. valve rods，24. clamp nuts，25. trim rings，Sealing ring on 26.，27. packing rings，28. valve bodies，29. gasket seals，210. lower seal，211. sealing-plug，212. locking nut，213. vacuum pipe evacuated joints，214. evacuate pipeline interface channel，215. vacuum pipes evacuate mouth，216. handwheel linkage sections，217. sealing-plug fastener heads，218. compress step.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is made it is further believed that explanation, but be not the restriction to this utility model protection domain.
As illustrated in fig. 1 and 2, a kind of vacuum pipe evacuator, evacuate unit, pumped vacuum systems, nitrogen displacement loop and closed loop evacuation system connecting line including circulating-heating supply air system, fine vacuum,
Described circulating-heating supply air system includes electric heater 3, centrifugal Middle pressure draught fan 2, heating collecting tubule 5 and stop valve 15, and heating collecting tubule 5 side connects bypass valve 16；
Fine vacuum evacuates unit and includes vacuum pump set 10, pipeline vacuum valve 11 and pipeline vacuum gauge 12；
Pumped vacuum systems includes evacuating branch vacuum valve 6, evacuation collecting tubule 7, evacuation pipeline vacuum valve 13 and evacuating collecting tubule regulating 14；
Nitrogen displacement loop includes nitrogen displacement vacuum valve 8 and nitrogen cylinder 9；
Closed loop evacuation system connecting line includes evacuating pipeline 17 and evacuating valve 18；
Fine vacuum evacuates unit and is connected with pumped vacuum systems respectively with nitrogen displacement loop；Pumped vacuum systems evacuates mouth 215 by closed loop evacuation system connecting line with vacuum pipe and is connected；
Vacuum pipe inner tube is connected with circulating-heating supply air system near the side evacuating mouth.
Vacuum pump set 10 is connected with evacuating collecting tubule 7 by pipeline vacuum valve 11 and evacuation pipeline vacuum valve 13, and nitrogen cylinder 9 is connected with evacuating collecting tubule 7 by nitrogen displacement vacuum valve 8.
Evacuate and be connected with vacuum pipe evacuation mouth 215 bottom valve 18, evacuate valve 18 wherein side and be connected with evacuating pipeline 17 one end；Evacuate pipeline 17 other end and be connected with evacuating branch vacuum valve 6.
The air outlet of centrifugal Middle pressure draught fan 2 connects electric heater 3, and the air outlet of electric heater 3 connects heating collecting tubule 5, and vacuum pipe 1 inner tube is connected by the hot-blast outlet of stop valve 15 with heating collecting tubule 5 near the side evacuating mouth.
Electric heater 3 includes housing, electrothermal tube, air inlet, air outlet, electrothermal tube wiring end cover and housing heat-insulation layer, being provided with axial bimetallic thermometer 4 between electric heater 3 and heating collecting tubule 5, fine vacuum evacuates to connect on unit peripheral hardware vacuum valve 19 and helium mass spectrometer leak detector 20.
Evacuate valve 18 include valve body 28, the valve rod 23 that is arranged in valve body 28 and be arranged on the sealing-plug 211 bottom valve rod 23 and be arranged on the evacuation pipeline interface channel 214 of valve body 28 side, evacuate pipeline interface channel 214 to be vertically arranged with valve body 28, four upper sealing rings 26 and four packing rings 27 it are provided with between valve body 28 top and valve rod 23, upper sealing ring 26 and packing ring 27 are compressed by trim ring 25, and valve body 28, trim ring 25 and valve rod 23 are compressed by clamp nut 24.It is provided with a cooperation vacuum pipe bottom valve body 28 and evacuates the vacuum pipe evacuated joint 213 of mouth 215, locked by a locking nut 212 between vacuum pipe evacuated joint 213 and valve body 28.It is provided with gasket seal 29 between valve body 28 and vacuum pipe evacuated joint 213, between sealing-plug 211 and vacuum pipe evacuated joint 213, is provided with two lower seal 210.Valve rod 23 top is provided with a valve handle 21, and valve handle 21 and valve rod 23 junction are provided with a spring washer 22.Valve rod 23 top is provided with the handwheel linkage section 216 coordinating valve handle 21, valve handle 21 center is rear fixing connection on handwheel linkage section 216, being provided with the sealing-plug fastener head 217 of fitted seal plug 211 bottom valve rod 23, sealing-plug 211 is enclosed within sealing-plug fastener head 217 and is fastenedly connected.Each upper sealing ring 26 is transferred and is provided with a packing ring 27 coordinating upper sealing ring 26.Being provided with the compression step 218 of Passscheiben 27 inside valve body 28, uppermost upper sealing ring contacts with trim ring 25, and nethermost packing ring contacts with compressing step 218.
The vacuum-pumping method of a kind of vacuum pipe evacuator, comprises the steps:
1) close bypass valve, open the stop valve of heating collecting tubule；Opening centrifugal Middle pressure draught fan, when wind speed reaches certain flow, wind speed switchs automatically opens output electrical heating signal, starts three groups of electric-heating control systems and makes electrothermal tube heat；Vacuum inner tube starts the cycle over air-supply heating, and vacuum pipe other end outlet temperature controls between 70 DEG C～80 DEG C；
2) close evacuation pipeline vacuum valve, close nitrogen displacement vacuum valve；Open pipeline vacuum valve and evacuate pipeline vacuum valve, starting fine vacuum unit and start evacuation；
3) when the vacuum evacuating collecting tubule reaches setting, open evacuation valve, open evacuation branch vacuum valve and start vacuum pipe evacuation, and record the Start Date of evacuation, time and ambient temperature；
4) laser heating air-supply is evacuated to evacuate collecting tubule and regulates the vacuum measured by TC2 when reaching 4Pa, the record date of evacuation, time and ambient temperature；
5) closing down vacuum pump set, blind off a line vacuum valve and evacuation pipeline vacuum valve, slow unlatching nitrogen displacement vacuum valve is filled with nitrogen to vacuum pipe and replaces, cuts out nitrogen when pressure reaches 0.01MPa and replace vacuum valve；
6) open fine vacuum unit after 20 minutes, open pipeline vacuum valve and evacuate pipeline vacuum valve, continuing evacuation；Repetitive cycling evacuation, nitrogen charging 3 times, every minor tick 40 minutes；
7) vacuum pipe laser heating, evacuation about about one week, regulates when the vacuum measured by TC2 reaches sealed knot vacuum level requirements when evacuation collecting tubule and carries out sealed knot；
8) during vacuum pipe sealed knot, press down on valve rod, sealing-plug is imported vacuum pipe evacuated joint and completes vacuum sealing；
9) closing evacuation branch vacuum valve, rotary valve rod counterclockwise is separated with sealing-plug by valve rod and valve rod is pulled up, and unclamps tightening nut and evacuates mouth disengaging with vacuum pipe, completes the sealed knot of vacuum pipe vacuum；
10) when, after the whole sealed knot of all vacuum, blinding off a line vacuum valve and evacuate pipeline vacuum valve, close down vacuum pump set, the record date of vacuum pipe sealed knot, time and ambient temperature.
When evacuation valve of the present utility model is installed, valve body installs restriction and the restriction that unrestricted vacuum pipe connects, determining as long as on-the-spot vacuum pipe evacuates mouth position, the connector of valve body evacuates mouth by snap joint (vacuum pipe evacuated joint) and vacuum pipe and is joined directly together, and it is the most convenient to install.
Evacuation valve of the present utility model and vacuum pipe evacuate mouth can convenient, be connected reliably, it is ensured that evacuation process and evacuate any link, do not affected by factors such as vacuum pipe vibrations, displacement or pipeline rollovers；Evacuate pipeline interface channel to be vertically arranged with valve body, enable it to not limited by any vacuum pipe orientation and position, ensure that evacuating valve orientation in office is all mutually 90 ° of positions with evacuation pipeline, evacuate pipeline interface channel and be linked to be a straight line with evacuating pipeline, can ensure that evacuation connecting line is difficult to leakage, improve and evacuate the reliability that pipeline connects.
The time of vacuum pipe evacuation is depended on: the size of mezzanine space, inner and outer pipes and interlayer cleannes, the performance of adiabator, thickness, preheating and drying degree and the number of plies of wrapping and wrapping method, the permission leakage size of discharge quantity, the effective pumping speed of vacuum pump set, the evacuation technique of employing and evacuate frock efficiently.
Vacuum system gas leakage is also the key factor affecting pump-down performance, if vacuum can not be taken out Shang Qu for a long time or does not reaches requirement, first have to inspection vacuum tube pumped vacuum systems device work the most normal, secondly check whether pipeline and connector have breakage, connection the tightst.Whether sealing surface has scuffing, connection the tightst.
In order to preferably overcome the impact of above-mentioned factors to evacuate difficulty, the evacuation frock of advanced design, improvement evacuate technique, play conclusive effect to improving and improving vacuum pipe product quality.
Facts have proved, inner and outer pipe is heated by evacuation process simultaneously, keeps constant temperature, interlayer to use nitrogen displacement, be interrupted evacuation, can preferably complete evacuation process, improve production efficiency, reach the index request of vacuum performance, and can well maintain vacuum in the future.This frock is with low cost, it is simple to make, mentality of designing is novel, idea is unique, the convenient vacuum pipe that meets of flexible operation evacuates the requirement of technique, and it is worth the embodiment obtained incisively and vividly at this.
Claims (9)
1. a vacuum pipe evacuator, it is characterised in that: it includes that circulating-heating supply air system, fine vacuum evacuate unit, pumped vacuum systems, nitrogen displacement loop and closed loop evacuation system connecting line,
Described circulating-heating supply air system includes electric heater, centrifugal Middle pressure draught fan, heating collecting tubule and stop valve, and described heating collecting tubule side connects bypass valve；
Described fine vacuum evacuates unit and includes vacuum pump set, pipeline vacuum valve and pipeline vacuum gauge；
Described pumped vacuum systems includes evacuating branch vacuum valve, evacuation collecting tubule, evacuation pipeline vacuum valve and evacuating collecting tubule regulating；
Described nitrogen displacement loop includes nitrogen displacement vacuum valve and nitrogen cylinder；
Described closed loop evacuation system connecting line includes evacuating pipeline and evacuating valve；
Described fine vacuum evacuates unit and is connected with pumped vacuum systems respectively with nitrogen displacement loop；Described pumped vacuum systems evacuates mouth by closed loop evacuation system connecting line with vacuum pipe and is connected；
Vacuum pipe inner tube is connected with circulating-heating supply air system near the side evacuating mouth.
A kind of vacuum pipe evacuator the most according to claim 1, it is characterised in that: described vacuum pump set is connected with evacuating collecting tubule by pipeline vacuum valve and evacuation pipeline vacuum valve, and described nitrogen cylinder is connected with evacuating collecting tubule by nitrogen displacement vacuum valve.
A kind of vacuum pipe evacuator the most according to claim 2, it is characterised in that: evacuate mouth with vacuum pipe bottom described evacuation valve and be connected, evacuate valve wherein side and be connected with evacuating pipeline one end；Evacuate the pipeline other end and be connected with evacuating branch vacuum valve.
A kind of vacuum pipe evacuator the most according to claim 1, it is characterized in that: the air outlet of described centrifugal Middle pressure draught fan connects electric heater, the air outlet of electric heater connects heating collecting tubule, and vacuum pipe inner tube is connected by the hot-blast outlet of stop valve with heating collecting tubule near the side evacuating mouth.
A kind of vacuum pipe evacuator the most according to claim 4, it is characterized in that: described electric heater includes housing, electrothermal tube, air inlet, air outlet, electrothermal tube wiring end cover and housing heat-insulation layer, being provided with axial bimetallic thermometer between electric heater and heating collecting tubule, described fine vacuum evacuates to connect on unit peripheral hardware vacuum valve and helium mass spectrometer leak detector.
A kind of vacuum pipe evacuator the most according to claim 1, it is characterized in that: described evacuation valve includes valve body, the valve rod being arranged in valve body and the sealing-plug being arranged on stem bottom and is arranged on the evacuation pipeline interface channel of valve body side, described evacuation pipeline interface channel is vertically arranged with valve body, some upper sealing rings and packing ring it is provided with between described body top and valve rod, described upper sealing ring and packing ring are compressed by trim ring, and described valve body, trim ring and valve rod are compressed by clamp nut.
A kind of vacuum pipe evacuator the most according to claim 6, it is characterised in that: described body base is provided with a cooperation vacuum pipe and evacuates the vacuum pipe evacuated joint of mouth, is locked by a locking nut between described vacuum pipe evacuated joint and valve body；It is provided with gasket seal between described valve body and vacuum pipe evacuated joint, between described sealing-plug and vacuum pipe evacuated joint, is provided with some lower seal.
A kind of vacuum pipe evacuator the most according to claim 6, it is characterised in that: described valve stem top is provided with a valve handle, and described valve handle and valve rod junction are provided with a spring washer；Described valve stem top is provided with the handwheel linkage section coordinating valve handle, described valve handle center is rear fixing connection on handwheel linkage section, described stem bottom is provided with the sealing-plug fastener head of fitted seal plug, and described sealing-plug is enclosed within sealing-plug fastener head and is fastenedly connected.
A kind of vacuum pipe evacuator the most according to claim 7, it is characterised in that: the quantity of described upper sealing ring and packing ring is four, and each upper sealing ring is transferred and is provided with a packing ring coordinating upper sealing ring, and the quantity of described lower seal is two；Being provided with the compression step of Passscheiben inside described valve body, uppermost upper sealing ring contacts with trim ring, and nethermost packing ring contacts with compressing step.
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| CN201620225477.4U CN205533072U (en) | 2016-03-23 | 2016-03-23 | Vacuum pipe evacuator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105649952A (en) * | 2016-03-23 | 2016-06-08 | 杭州川空通用设备有限公司 | Vacuum pipe evacuator and evacuating method thereof |
| CN106595384A (en) * | 2016-12-09 | 2017-04-26 | 安徽亿瑞深冷能源科技有限公司 | Automatic cleaning system for refrigerator |
| CN108591028A (en) * | 2018-03-30 | 2018-09-28 | 嘉兴市华鼎日用品有限公司 | A kind of evacuator |
-
2016
- 2016-03-23 CN CN201620225477.4U patent/CN205533072U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105649952A (en) * | 2016-03-23 | 2016-06-08 | 杭州川空通用设备有限公司 | Vacuum pipe evacuator and evacuating method thereof |
| CN106595384A (en) * | 2016-12-09 | 2017-04-26 | 安徽亿瑞深冷能源科技有限公司 | Automatic cleaning system for refrigerator |
| CN108591028A (en) * | 2018-03-30 | 2018-09-28 | 嘉兴市华鼎日用品有限公司 | A kind of evacuator |
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