CN100554682C - Vacuum pumping method and device thereof - Google Patents
Vacuum pumping method and device thereof Download PDFInfo
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- CN100554682C CN100554682C CNB2006100092140A CN200610009214A CN100554682C CN 100554682 C CN100554682 C CN 100554682C CN B2006100092140 A CNB2006100092140 A CN B2006100092140A CN 200610009214 A CN200610009214 A CN 200610009214A CN 100554682 C CN100554682 C CN 100554682C
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Abstract
The invention discloses a kind of vacuum pumping method and device thereof, in order to the urceolus of multilayer heat insulating vessel and the interlayer between the inner core are vacuumized.Wherein this vacuum pumping device comprises: first air transporting arrangement, and it has the air outlet; First gas heater, its import is connected with the air outlet of this first air transporting arrangement, and its outlet is connected with the suction port of this inner core; Vacuumize unit, it is connected with this interlayer; Second air transporting arrangement, it has the air outlet; Second gas heater, its import is connected with the air outlet of this second air transporting arrangement, and its outlet is connected with this interlayer.Adopt vacuum pumping method of the present invention and device thereof, the pumpdown time of multilayer heat insulation storage tank, jar case, tank car foreshortened to 3-6 days by original 7-15 days, shorten the manufacturing cycle of high vacuum multiple layer heat insulation storage tank, jar case, tank car greatly, reduced manufacture cost.
Description
Technical field
The present invention relates to a kind of vacuum pumping method and device thereof, especially relate to and a kind ofly can significantly improve vacuum pumping method and the device thereof that vacuumizes efficient and degree of vacuum.
Background technique
Heat-insulating property is required high cryogenic liquid storage tank, cryogenic liquide jar case, cryogenic liquid tank lorries such as storage liquid nitrogen, liquid oxygen, liquid hydrogen, liquid argon and LNG Liquefied natural gas both at home and abroad, its adiabatic form mostly is high vacuum multiple layer heat insulation, and degree of vacuum need reach below the absolute pressure 0.03Pa.For tens of sides' cryogenic liquid storage tank, the time that interlayer vacuumizes itself will be very long, and because the air-breathing property of the thermoinsulation material in the interlayer is strong, and the resistance of bleeding is big, adsorbed moisture is difficult to extract in the thermoinsulation material.High vacuum cryogenic liquid storage tank, jar case, the tank car interlayer vacuumizes common prior art following two kinds: the one, and adopt the mode of external heat to make moisture gasification in the thermoinsulation material, directly air in the interlayer and moisture are extracted out by vacuum pump subsequently, reached the degree of vacuum of interlayer requirement.Though adopt this method can reach the degree of vacuum of code requirement, because vacuum itself just has heat-insulating property, external heat is difficult to heat is reached thermoinsulation material, wholely adds the chronic of Hot swapping vacuum needs; The 2nd, by being charged into interlayer, hot gas adds Hot swapping, as disclosed a kind of liquefied natural gas (LNG) tank displaced air vacuum pumping method among the CN03152769.8, but the method heat energy utilization rate is low, and is not easy to operate, only be used for the less demanding container of vacuum, and be not suitable for the high vacuum multiple layer heat insulation container.Above-mentioned two kinds of methods all need spend great amount of manpower, material resources and financial resources, manufacture cost is very high, and the cryogenic liquid storage tank, jar case, the tank car that adopt the existing technology of vacuumizing to produce, moisture in the thermoinsulation material in its interlayer is difficult to thoroughly extract, remaining moisture can constantly discharge aqueous vapor behind the vacuum sealed knot, cause the degree of vacuum of interlayer to reduce gradually, and heat-insulating property descends.
Summary of the invention
The objective of the invention is to overcome the prior art above shortcomings, provide a kind of in order to such as the urceolus of multilayer heat insulating vessels such as high vacuum multiple layer heat insulation storage tank, jar case, tank car and vacuum pumping method and the device thereof that the interlayer between the inner core vacuumizes.
One object of the present invention is to provide a kind of vacuum pumping method and the device thereof that can replace the moisture in the interlayer more up hill and dale.
Another purpose of the present invention is to provide a kind of vacuum pumping method and device thereof that shortens the pumpdown time when can reach condition of high vacuum degree.
In order to the urceolus of multilayer heat insulating vessel and the interlayer between the inner core are vacuumized, it comprises according to vacuum pumping device of the present invention: first air transporting arrangement, and it has the air outlet; First gas heater, its import is connected with the air outlet of this first air transporting arrangement, and its outlet is connected with the suction port of this inner core; Vacuumize unit, it is connected with this interlayer; Second air transporting arrangement, it has the air outlet; Second gas heater, its import is connected with the air outlet of this second air transporting arrangement, and its outlet is connected with this interlayer.
Preferably, vacuum pumping device also comprises cold-trap, and it is arranged at this and vacuumizes between unit and this interlayer, and vacuumizes unit and this interlayer with this respectively and be connected.
Preferably, the gas of this second air transporting arrangement conveying is nitrogen or dry air.
Preferably, vacuum pumping device also comprises thermal insulation apparatus, and it is coated on the outside of this multilayer heat insulating vessel.
Preferably, the gas of this first air transporting arrangement conveying is nitrogen or air.
Preferably, this first air transporting arrangement also comprises suction port, and this suction port is connected with the relief opening of this inner core.
The present invention also provides a kind of vacuum pumping method, and in order to the urceolus of multilayer heat insulating vessel and the interlayer between the inner core are vacuumized, it may further comprise the steps: the first step, and startup vacuumizes unit, and interlayer is vacuumized; Second step, open first air transporting arrangement and first gas heater, the gas that this first air transporting arrangement air outlet is blown out heats in first gas heater, wherein gas temperature is controlled between 150 ℃-300 ℃, suction port through inner core fills into inner core inside then, so that inner core is heated; In the 3rd step, when the gas temperature of discharging when the relief opening of this inner core reached between 100 ℃-150 ℃, first gas heater stopped heating; When the gas temperature of discharging when the relief opening of this inner core was lower than 100 ℃, first gas heater began heating, so that the gas temperature of discharging remains between 100 ℃-150 ℃; The 4th step, when the gas temperature of discharging reaches between 100 ℃-150 ℃, vacuumizing unit stops interlayer being vacuumized, open second air transporting arrangement and second gas heater, the gas that this second air transporting arrangement air outlet is blown out heats in second gas heater, wherein gas temperature is controlled between 150 ℃-180 ℃, fills into interlayer then, and stops scheduled time slot; In the 5th step, startup vacuumizes unit, and interlayer is vacuumized; In the 6th step, repeated for the 4th, the 5th step, up to reaching predetermined vacuum level.
Preferably, also comprise the step that multilayer heat insulating vessel is placed thermal insulation apparatus before the first step of described vacuum pumping method.
Preferably, the gas of this second air transporting arrangement conveying is nitrogen or dry air.
Preferably, in described the 5th step, the gas stream of extracting out from this interlayer arrives behind cold-trap again and vacuumizes unit.
Preferably, the scheduled time slot in the 4th step is 1-5 hour.
Preferably, comprise also that between this second step and the 3rd step the gas of described this inner core of heating enters this first air transporting arrangement and this first gas heater by the relief opening discharge of this inner core subsequently again, this inner core is carried out hydronic step with this.
The invention provides a kind of in order to such as the urceolus of multilayer heat insulating vessels such as high vacuum multiple layer heat insulation storage tank, jar case, tank car and vacuum pumping method and the device thereof that the interlayer between the inner core vacuumizes, it can replace the moisture in the interlayer more up hill and dale, and can shorten the pumpdown time when reaching condition of high vacuum degree.
The present invention can utilize original interface of interlayer when interlayer is heated, make interlayer only have an interface like this, thereby the interlayer leak source is reduced, and helps vacuum and keeps.
The present invention carry out to be interrupted heating to interlayer, and hot gas has certain waiting time in interlayer, helps the absorption of dry gas (or nitrogen) to interlayer moisture like this.And whole replacement process only needs interlayer heating three to five times, and the interlayer most of the time is in the state of vacuumizing, and like this container inner core is continued the circulation heating, and heat is passed to the thermal insulating material of interlayer by the container inner core, makes moisture gasification back extract out highly beneficial.Because laminated vacuum has insulation effect, the heat of inner container is difficult for running off heat energy utilization rate height.
Heating gas of the present invention is safe gas such as nitrogen, air, and it is safe and simple to operate.
Employing is according to method and apparatus of the present invention, the pumpdown time of multilayer heat insulation storage tank, jar case, tank car foreshortened to 3-6 days by original 7-15 days, shortened the manufacturing cycle of high vacuum multiple layer heat insulation storage tank, jar case, tank car greatly, reduced manufacture cost.
Description of drawings
Fig. 1 is the structural representation according to the vacuum pumping device of the preferred embodiment of the present invention.
Embodiment
Below, will illustrate according to the preferred embodiments of the present invention with reference to the accompanying drawings.
As shown in Figure 1, it is the structural representation according to the vacuum pumping device of the preferred embodiment of the present invention.According to vacuum pumping device of the present invention in order to the urceolus of multilayer heat insulating vessel and the interlayer between the inner core are vacuumized, wherein filling heat insulator in the interlayer between urceolus and inner core, and this high vacuum multiple layer heat insulation container can be applicable in low-temperature storage tank, jar case or the tank car.This vacuum pumping device comprises: first air transporting arrangement 7, and it has the air outlet; First gas heater 6, its import is connected with the air outlet of first air transporting arrangement 7, its outlet is connected with the suction port A of inner core 4, this suction port A is positioned at the top of inner core 4, the air of sending from the air outlet of first air transporting arrangement 7 is after 6 heating of first gas heater thus, can directly heat the inner core 4 of multilayer heat insulating vessel, from the relief opening B of inner core 4, be discharged to the outside of inner core 4 subsequently.This first air transporting arrangement 7 also can comprise suction port, this suction port is connected with the relief opening B of this inner core, this relief opening B is positioned at the bottom of inner core 4, constitute the gas flow loop that gas is carried therein thus: promptly the gas that blows out from the air outlet of first air transporting arrangement 7 enters first gas heater 6, high-temperature gas after 6 heating of first gas heater enters in the inner core 4 through the suction port A of inner core 4, so that inner core 4 is heated, cryogenic gas behind the heating inner core 4 is discharged from inner core 4 through relief opening B, return again in first air transporting arrangement 7 by the suction port of pipeline then, and after this gas enters into first gas heater 6 once more through first air transporting arrangement 7.The gas that is adopted in this gas flow loop is air or nitrogen.Below be that example describes with the air.By this gas flow loop, directly heat the inner core 4 of multilayer heat insulating vessel with hot air, heat is passed to rapidly be close to inner core 4 outer walls to be positioned on the thermoinsulation material of interlayer 2, the moisture that adsorbs on the insulating material can hightail.Also comprise according to vacuum pumping device of the present invention vacuumizing unit 8, it is connected with this interlayer 2.Vacuumizing unit 8 can be connected on the interface C of interlayer 2 by pipeline.For quickening the discharge of moisture in the interlayer, can also on the pipeline that vacuumizes between unit 8 and the interface C, cold-trap 11 be set, like this after the cooled with liquid nitrogen of gas in cold-trap 11 of from interlayer 2, extracting out, can from cold-trap 11, discharge with wherein condensate moisture and along the direction shown in the arrow D.And the amount of the cooling water of discharging from cold-trap can be used for indicating the content of interlayer moisture, promptly indicates the displacement degree of moisture in the interlayer.And cold-trap can also play the pump oil back diffusion that prevents to vacuumize unit and pollute interlayer, and vacuumizes the working life that unit can prolong the vacuum unit because of it can stop that moisture enters into.Vacuum pumping device of the present invention also comprises second air transporting arrangement 9, and it has the air outlet; Second gas heater 10, its suction port is connected with the air outlet of second air transporting arrangement 9, and its outlet is connected with interface C on this interlayer 2, to avoid causing the interlayer leak source to increase because of more interlayer interface is set on interlayer.The gas of carrying in second air transporting arrangement 9 can be nitrogen, also can be dry air.Below be that example describes with nitrogen.The nitrogen of sending from second air transporting arrangement 9 is fed in the interlayer 2 after 10 heating of second gas heater.High temperature nitrogen can the thermoinsulation material in the interlayer 2 is adsorbed non-condensible gas and moisture cement out.Usually also be provided with vacuum gauge 5 on multilayer heat insulating vessel, it is used for measuring the degree of vacuum of interlayer 2.Use can make the degree of vacuum of interlayer reach below the absolute pressure 0.03Pa according to vacuum pumping device of the present invention.Also can comprise thermal insulation apparatus 1 according to vacuum pumping device of the present invention, it is coated on the outside of the urceolus 3 of multilayer heat insulating vessel, in order to further to prevent the heat dissipation in inner core 4 or the interlayer 2.
The present invention also provides a kind of vacuum pumping method, in order to the urceolus of multilayer heat insulating vessel and the interlayer between the inner core are vacuumized, and filling heat insulator in the interlayer between urceolus and inner core wherein, this vacuum pumping method can may further comprise the steps.
At first, multilayer heat insulating vessel is placed thermal insulation apparatus 1; Startup vacuumizes unit 8, and interlayer 2 is vacuumized; Open first air transporting arrangement 7 and first gas heater 6, the gas that first air transporting arrangement, 7 air outlets are blown out heats in first gas heater 6, wherein gas temperature is controlled between 150 ℃-300 ℃, fill into inner core 4 inside through the suction port A of inner core 4 then, so that inner core 4 is heated, discharge by the relief opening B of inner core 4 more subsequently and enter first air transporting arrangement 7 and first gas heater 6, with this to inner core 4 heating that circulates, adopt hydronic mode can make rate of heating fast to inner core 4, and heat energy utilization rate height, the gas that this first air transporting arrangement is carried is nitrogen or air, in this process, heat in the gas be delivered to fast in the interlayer 2 thermoinsulation material on, after the moisture that adsorbs on the thermoinsulation material being gasified rapidly break away from, be evacuated unit and extract out from interface C; When the gas temperature of the relief opening B of this inner core 4 discharge reached between 100 ℃-150 ℃, first gas heater 6 stopped heating; When the gas temperature of discharging when the relief opening of this inner core was lower than 100 ℃, first gas heater 6 began heating, so that the gas temperature of discharging remains between 100 ℃-150 ℃; When the gas temperature of discharging reaches between 100 ℃-150 ℃, vacuumize unit 8 and stop interlayer 2 is vacuumized; Open second air transporting arrangement 9 and second gas heater 10 this moment, the gas that second air transporting arrangement, 9 air outlets are blown out heats in second gas heater 10, wherein gas temperature is controlled between 150 ℃-180 ℃, fill into interlayer 2 then, and stop scheduled time slot, this period can be 1-5 hour, and the gas that this second air transporting arrangement is carried can be nitrogen or dry air; Start and to vacuumize unit 8, once more interlayer 2 is vacuumized, in the process that this vacuumizes, the gas stream of extraction is arrived through cold-trap 11 again vacuumize unit 8, at this moment when vacuumizing, also should comprise the step of adding refrigeration agent liquid nitrogen in cold-trap 11; Repeat to open the step that second air transporting arrangement charges into the step of gas and once more interlayer vacuumized to interlayer, up to reaching predetermined vacuum level, here adopt hot nitrogen (or dry air) incoagulable gas that the thermoinsulation material in the interlayer is adsorbed and moisture to cement out, the most gases in the interlayer that vacuumize and make that interlayer is carried out are drawn out of subsequently, deviate from further that thermoinsulation material is adsorbed incoagulable gas and moisture, thereby avoided these gases under vacuum, constantly from thermoinsulation material, to discharge and made the layer vacuum variation, the phenomenon that heat-insulating property descends takes place, help the formation of vacuum and keep, the pumpdown time is shortened greatly; When measuring degree of vacuum in the interlayer by vacuum gauge equal vacuum sensor and reach predetermined value, multilayer heat insulating vessel is carried out the vacuum sealed knot at last.
Although disclose the preferred embodiments of the present invention for illustrative purposes, those skilled in the art should be understood that under the situation that does not break away from appended claim scope of disclosure of the present invention and spirit, still can carry out multiple modification, adds and substitute.
Claims (11)
1. vacuum pumping device in order to the urceolus of multilayer heat insulating vessel and the interlayer between the inner core are vacuumized, is characterized in that comprising:
First air transporting arrangement, it has the air outlet;
First gas heater, its import is connected with the air outlet of this first air transporting arrangement, and its outlet is connected with the suction port of this inner core;
Vacuumize unit, it is connected with this interlayer;
Second air transporting arrangement, it has the air outlet;
Second gas heater, its import is connected with the air outlet of this second air transporting arrangement, and its outlet is connected with this interlayer.
2. vacuum pumping device as claimed in claim 1 is characterized in that also comprising cold-trap, and it is arranged at this and vacuumizes between unit and this interlayer, and vacuumizes unit and this interlayer with this respectively and be connected.
3. vacuum pumping device as claimed in claim 1 is characterized in that the gas that this second air transporting arrangement is carried is nitrogen or dry air.
4. vacuum pumping device as claimed in claim 1 is characterized in that also comprising thermal insulation apparatus, and it is coated on the outside of this multilayer heat insulating vessel.
5. vacuum pumping device as claimed in claim 1 is characterized in that the gas that this first air transporting arrangement is carried is nitrogen or air.
6. vacuum pumping device as claimed in claim 1 is characterized in that this first air transporting arrangement also comprises suction port, and this suction port is connected with the relief opening of this inner core.
7. vacuum pumping method in order to the urceolus of multilayer heat insulating vessel and the interlayer between the inner core are vacuumized, is characterized in that may further comprise the steps:
The first step, startup vacuumizes unit, and interlayer is vacuumized;
Second step, open first air transporting arrangement and first gas heater, the gas that this first air transporting arrangement air outlet is blown out heats in this first gas heater, wherein gas temperature is controlled between 150 ℃-300 ℃, suction port through this inner core fills into this inner core inside then, so that this inner core is heated;
In the 3rd step, when the gas temperature of discharging when the relief opening of this inner core reached between 100 ℃-150 ℃, this first gas heater stopped heating; When the gas temperature of discharging when the relief opening of this inner core was lower than 100 ℃, this first gas heater began heating, so that the gas temperature of described discharge remains between 100 ℃-150 ℃;
The 4th step, when the gas temperature of described discharge reaches between 100 ℃-150 ℃, this vacuumizes unit and stops this interlayer is vacuumized, open second air transporting arrangement and second gas heater, the gas that this second air transporting arrangement air outlet is blown out heats in this second gas heater, wherein gas temperature is controlled between 150 ℃-180 ℃, fills into this interlayer then, and stops scheduled time slot;
The 5th step started this and vacuumizes unit, and this interlayer is vacuumized;
In the 6th step, repeated for the 4th, the 5th step, up to reaching predetermined vacuum level.
8. vacuum pumping method as claimed in claim 7 is characterized in that before the described first step further comprising the steps of:
This multilayer heat insulating vessel is placed thermal insulation apparatus.
9. vacuum pumping method as claimed in claim 7 is characterized in that in described the 5th step, the gas stream of extracting out arrives again and vacuumizes unit behind cold-trap from this interlayer.
10. vacuum pumping method as claimed in claim 7 is characterized in that the scheduled time slot in the 4th step is 1-5 hour.
11. vacuum pumping method as claimed in claim 7 is characterized in that between this second step and the 3rd step further comprising the steps of:
The gas of described this inner core of heating is discharged by the relief opening of this inner core more subsequently and is entered this first air transporting arrangement and this first gas heater, with this to the heating that circulates of this inner core.
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| CNB2006100092140A CN100554682C (en) | 2006-02-14 | 2006-02-14 | Vacuum pumping method and device thereof |
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| CNB2006100092140A CN100554682C (en) | 2006-02-14 | 2006-02-14 | Vacuum pumping method and device thereof |
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| CN100554682C true CN100554682C (en) | 2009-10-28 |
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| CN102518577A (en) * | 2011-12-22 | 2012-06-27 | 北京华诚浩达真空空压设备有限公司 | Vacuum-pumping system for multiple-dewar interlayer and vacuum-pumping method thereof |
| CN102797943A (en) * | 2012-08-31 | 2012-11-28 | 苏州拓维工程装备有限公司 | Vacuumizing technology for vacuum low-temperature thermal insulation pipeline |
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| CN102518577A (en) * | 2011-12-22 | 2012-06-27 | 北京华诚浩达真空空压设备有限公司 | Vacuum-pumping system for multiple-dewar interlayer and vacuum-pumping method thereof |
| CN102518577B (en) * | 2011-12-22 | 2014-04-30 | 北京华诚浩达真空空压设备有限公司 | Vacuum-pumping system for multiple-dewar interlayer and vacuum-pumping method thereof |
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Address after: No. 2 Shekou Harbour Road in Shenzhen city of Guangdong Province in 518000 Patentee after: Zhongji Vehicle (Group) Co.,Ltd. Patentee after: ZHANGJIAGANG CIMC SANCTUM CRYOGENIC EQUIPMENT Co.,Ltd. Address before: 518067 No. 2 Harbour Road, Shekou, Guangdong, Shenzhen Patentee before: CIMC vehicle (Group) Co.,Ltd. Patentee before: ZHANGJIAGANG CIMC SANCTUM CRYOGENIC EQUIPMENT Co.,Ltd. |
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