CN114352928B - Ultralow-temperature liquefied gas pressure container for improving heat insulation effect - Google Patents
Ultralow-temperature liquefied gas pressure container for improving heat insulation effect Download PDFInfo
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- CN114352928B CN114352928B CN202111383816.3A CN202111383816A CN114352928B CN 114352928 B CN114352928 B CN 114352928B CN 202111383816 A CN202111383816 A CN 202111383816A CN 114352928 B CN114352928 B CN 114352928B
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Abstract
The invention discloses an ultralow-temperature liquefied gas pressure container for improving heat insulation effect, which comprises an inner container, an outer container and a supporting component supported between the inner container and the outer container, wherein the supporting component comprises a first supporting ring and a second supporting ring with annular hollow inner cavities, and a gas throttling pipe is arranged between the annular hollow inner cavities of the first supporting ring and the second supporting ring; a first gas pipeline is led out from the upper gas space position inside the inner container, the first gas pipeline is led out and enters the annular hollow cavity of the first support ring, and a second gas pipeline is led out from the annular hollow cavity of the second support ring; the first gas pipeline is provided with a first valve, the second gas pipeline is provided with a second valve, a branch gas pipeline is arranged at a section of the second gas pipeline between the second valve and the outer container, and a third valve and a vacuumizing device are sequentially arranged on the branch gas pipeline. The invention improves the heat insulation effect of the ultralow temperature liquefied gas pressure vessel.
Description
Technical Field
The invention relates to the technical field of low-temperature pressure containers, in particular to an ultralow-temperature liquefied gas pressure container for improving heat insulation effect.
Background
The ultra-low temperature liquefied gas storage pressure container is a deep-cold pressure container for storing ultra-low temperature liquefied gas, adopts a double-layer structure, comprises an inner container and an outer container, and forms a vacuum interlayer space between the inner container and the outer container to isolate external heat transfer so as to ensure the safety of the low temperature liquefied gas in the inner container. In order to improve the heat insulation performance, a heat insulation material is generally wound on the inner container tank body to reduce heat conduction, convection and radiation, so that the purposes of heat insulation and heat preservation and low-temperature liquid storage are achieved. The arrangement of the heat preservation and insulation material on the tank body in the interlayer is a key technology for ensuring the heat insulation effect of the deep-cold pressure container, and directly influences the heat insulation performance of the deep-cold pressure container.
Problems with prior art ultra low temperature liquefied gas storage pressure vessels are as follows:
firstly, the support structure between the inner vessel and the outer vessel will produce a certain heat transfer, thereby affecting the insulating effect of the ultra-low temperature liquefied gas pressure vessel.
Secondly, the cold energy of the liquefied gas discharged by the overpressure is not fully utilized, so that the heat insulation effect of the ultralow-temperature liquefied gas pressure vessel is also affected.
Disclosure of Invention
In order to solve the problems, the invention provides an ultralow temperature liquefied gas pressure vessel for improving the heat insulation effect, and aims to improve the heat insulation effect of the ultralow temperature liquefied gas pressure vessel. The specific technical scheme is as follows:
an ultralow-temperature liquefied gas pressure container for improving heat insulation effect comprises an inner container, an outer container, an interlayer space formed between the inner container and the outer container, and a support assembly supported between the inner container and the outer container, wherein the support assembly comprises a pair of support rings with annular hollow inner cavities, a plurality of outer support heat insulation pads arranged at the periphery of the support rings and arranged at intervals along the circumferential direction and used for supporting the inner walls of the outer container, and a plurality of inner support heat insulation pads arranged at the periphery of the support rings and arranged at intervals along the circumferential direction and used for supporting the outer walls of the inner container; the pair of support rings comprises a first support ring and a second support ring, and a gas throttling pipe which is communicated with each other is arranged between the annular hollow inner cavity of the first support ring and the annular hollow inner cavity of the second support ring; a first gas pipeline is led out from the upper gas space position inside the inner container, the first gas pipeline is led out and enters the annular hollow cavity of the first support ring, and a second gas pipeline is led out from the annular hollow cavity of the second support ring; the first valve is arranged on the first gas pipeline, the second valve is arranged on the second gas pipeline, a branch gas pipeline is arranged on the second gas pipeline at a position between the second valve and the outer container, and a third valve and a vacuumizing device are sequentially arranged on the branch gas pipeline.
Preferably, the number of the gas throttle pipes is several and is uniformly arranged along the circumferential direction at the periphery of the inner container.
As a further improvement of the invention, a heat radiation protection and heat insulation screen is arranged in the interlayer space, and a plurality of gas throttle pipes are respectively connected with the heat radiation protection and heat insulation screen.
Preferably, the heat radiation protection heat insulation screen comprises an outer heat radiation protection heat insulation screen and an inner heat radiation protection heat insulation screen, and the plurality of gas throttle pipes are connected between the outer heat radiation protection heat insulation screen and the inner heat radiation protection heat insulation screen.
In the invention, the heat radiation protection and heat insulation screen is also arranged at the two ends of the inner container in the interlayer space and is connected with the supporting ring.
In the invention, the heat radiation protection and heat insulation screen at least comprises a glass fiber paper layer, a chemical fiber net layer and an aluminized film layer which are sequentially overlapped; the aluminum plating film layer on the outer heat radiation protection heat insulation screen is positioned on the outer side of the outer heat radiation protection heat insulation screen, and the aluminum plating film layer on the inner heat radiation protection heat insulation screen is positioned on the inner side of the inner heat radiation protection heat insulation screen.
In the invention, a replaceable molecular sieve absorber is arranged on the interlayer space.
The method for improving the heat insulation effect of the ultralow-temperature liquefied gas pressure container comprises the following steps in sequence:
(1) The support ring is pre-vacuumized: setting the first valve and the second valve in a closed state, simultaneously opening the third valve, vacuumizing the annular hollow cavity of the support ring through a vacuumizing device, and closing the third valve after vacuumizing;
(2) The first valve is opened; opening the first valve when the air pressure in the inner container increases to a certain pressure value;
(3) The overpressure relief primary refrigeration: after the first valve is opened, under the action of vacuum suction force of the annular hollow inner cavity of the first support ring, the gas with overpressure enters the annular hollow inner cavity of the first support ring from the inner container through the first gas pipeline, and the gas with overpressure rapidly expands after entering the annular hollow inner cavity of the first support ring, so that first heat absorption is realized, and meanwhile, the first support ring is cooled;
(4) Overpressure relief secondary refrigeration: under the action of vacuum suction force of the annular hollow inner cavity of the second support ring, gas in the annular hollow inner cavity of the first support ring enters the annular hollow inner cavity of the second support ring through the gas throttle pipe and rapidly expands in the annular hollow inner cavity of the second support ring, so that second heat absorption is realized, and meanwhile, the second support ring is cooled;
(5) Vacuumizing and exhausting: the first valve is closed, then the third valve is opened, the heat absorbing gas in the annular hollow cavity of the support ring is discharged through the vacuumizing device, and the third valve is closed after vacuumizing;
(6) Periodic cooling of the support ring: repeating the steps (2) to (5) until the air pressure in the inner container is reduced below a safe pressure value, thereby realizing the periodic cooling of the first support ring and the second support ring, and playing a role in reducing the heat transfer between the support ring and the inner support heat insulation pad and between the support ring and the outer support heat insulation pad, and further improving the heat insulation effect of the ultralow temperature liquefied gas pressure container;
the periodic cooling of the first support ring and the second support ring drives the periodic cooling of the heat radiation prevention heat insulation screen in the interlayer space, so that the heat insulation effect of the ultralow temperature liquefied gas pressure container is further improved.
According to the invention, the vacuum degree in the interlayer space is improved by periodically replacing the molecular sieve in the molecular sieve absorber, so that the heat insulation effect of the ultralow-temperature liquefied gas pressure vessel is improved.
The beneficial effects of the invention are as follows:
firstly, the ultralow temperature liquefied gas pressure container for improving the heat insulation effect adopts a specially designed support assembly structure with an annular hollow inner cavity, wherein the annular hollow inner cavity is preset to be vacuum for rapid release, expansion and heat absorption of the overpressure liquefied gas in the inner container; the gas pipeline for overpressure relief is led out from the inner container and is connected into the annular hollow cavity first, the first valve is opened to be communicated with the annular hollow cavity when the inner container is in overpressure, the overpressure liquefied gas rapidly expands in the annular hollow cavity under the action of vacuum to absorb heat, and the liquefied gas after absorbing heat is discharged outwards, so that the full utilization of the cold quantity of the overpressure relief liquefied gas is realized, and the heat insulation effect of the ultralow temperature liquefied gas pressure container is further improved.
Second, according to the ultralow temperature liquefied gas pressure container for improving the heat insulation effect, the gas throttle pipe is connected between the first support ring and the second support ring, and the ultralow temperature liquefied gas pressure container can realize twice refrigeration of the overpressure liquefied gas, so that the heat insulation effect of the ultralow temperature liquefied gas pressure container is further improved.
Third, according to the ultralow temperature liquefied gas pressure container for improving the heat insulation effect, the gas throttle pipe is arranged between the outer heat radiation protection heat insulation screen and the inner heat radiation protection heat insulation screen, two ends of the outer heat radiation protection heat insulation screen and the inner heat radiation protection heat insulation screen are connected to the pair of support rings, and the cold energy of the liquefied gas discharged by overpressure is fully utilized through the heat transfer effect, so that the cold screen of the heat radiation protection heat insulation screen is formed, and the heat insulation effect of the ultralow temperature liquefied gas pressure container is further improved.
Fourth, according to the ultra-low temperature liquefied gas pressure container for improving the heat insulation effect, the support assembly is separated from the inner container and the outer container through the outer support heat insulation pad and the inner support heat insulation pad, and the heat insulation pad is subjected to the effect of discharging the cold energy of the liquefied gas through overpressure, so that the heat insulation effect is improved.
Fifth, according to the ultralow-temperature liquefied gas pressure container for improving the heat insulation effect, the first valve, the third valve and the vacuumizing device are mutually cooperated, quantitative controllable release of the liquefied gas discharged by overpressure is realized, and the safety is good.
Sixth, the invention is used for improving the liquefied gas pressure vessel of the ultra-low temperature of the adiabatic effect, the replaceable molecular sieve adsorber realizes the periodic replacement of the molecular sieve, thus solve the technical problem that the molecular sieve on the traditional cryogenic pressure vessel can not be replaced after losing activity, thus has improved the service life of the cryogenic pressure vessel.
Drawings
FIG. 1 is a schematic view of an ultra-low temperature liquefied gas pressure vessel for enhancing heat insulation effect according to the present invention;
FIG. 2 is an enlarged view of a portion of the molecular sieve adsorption cartridge and the vacuum environment specific two-way valve portion of FIG. 1 (the thermal radiation protection and insulation shield is not shown);
fig. 3 is a partially enlarged view of fig. 2 (adsorption passage is in an open state);
FIG. 4 is a schematic view of the structure of the electric soldering iron and the heat-expandable sealing plunger of FIG. 3 shifted into the vacuum sealing hole (the adsorption passage is in a blocked state);
FIG. 5 is a cross-sectional view of the annular cavity portion of the valve body;
FIG. 6 is a schematic diagram of an improvement of the adsorption line to a curved line configuration;
fig. 7 is a schematic view of a heat radiation protection and insulation screen provided at both ends of the inside of the interlayer space of the ultra-low temperature liquefied gas pressure vessel.
In the figure: 1. the inner container, 2, outer container, 3, sandwich space, 4, molecular sieve adsorber, 5, molecular sieve adsorption box, 6, molecular sieve, 7, lid, 8, vacuum environment dedicated two-way valve, 9, adsorption hole, 10, sealing sheet, 11, valve body, 12, vacuum sealing hole, 13, thermal expansion sealing plunger, 14, adsorption pipe, 15, feed pipe, 16, discharge pipe, 17, head, 18, main adsorption passage, 19, inlet side adsorption passage, 20, outlet side adsorption passage, 21, valve cover, 22, electric iron (handle portion), 23, electric iron heating rod, 24, bellows, 25, protective sleeve, 26, high temperature resistant seal, 27, evacuation pipe, 28, heater, 29, annular cavity, 30, coolant inlet hole, 31, coolant outlet hole, 32, steel wire mesh filter baffle, 33, filter screen, 34, support member, 35, annular hollow cavity, 36, outer support insulating pad, 37, inner support insulating pad, 38, first support ring, 39, second support ring, 40, gas throttle, gas pipe, 41, second gas pipe, 41, gas pipe, 45, outer side insulating pad, 48, outer side insulating device, radiation protection, heat insulation pipe, 48, vacuum protection, outer side insulating device, radiation protection, heat shielding device, 45, vacuum protection device, outer side insulating device, 45, vacuum protection device, heat shielding device, 48, heat shielding device, and air shielding device.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Example 1
An embodiment of an ultra-low temperature liquefied gas pressure vessel for enhancing heat insulation effect of the present invention is shown in fig. 1 to 7, comprising an inner vessel 1, an outer vessel 2, a sandwich space 3 formed between the inner vessel 1 and the outer vessel 2, a support assembly 34 supported between the inner vessel 1 and the outer vessel 2, the support assembly 34 comprising a pair of support rings 38, 39 with annular hollow cavities 35, a number of outer support heat insulation pads 36 provided at the outer circumference of the support rings 38, 39 and arranged at intervals in the circumferential direction for supporting the inner wall of the outer vessel 2, a number of inner support heat insulation pads 37 provided at the inner circumference of the support rings 38, 39 and arranged at intervals in the circumferential direction for supporting the outer wall of the inner vessel 1; the pair of support rings 38, 39 comprises a first support ring 38 and a second support ring 39, a gas restriction pipe 40 being provided in communication between the annular hollow cavity 35 of the first support ring 38 and the annular hollow cavity 35 of the second support ring 39; a first gas pipeline 41 is led out from the upper gas space position inside the inner container 1, the first gas pipeline 41 is led out and enters the annular hollow cavity 35 of the first support ring 38, and a second gas pipeline 42 is led out from the annular hollow cavity 35 of the second support ring 39; the first gas pipeline 41 is provided with a first valve 43, the second gas pipeline 42 is provided with a second valve 44, a branch gas pipeline 45 is arranged on the second gas pipeline 42 at a position between the second valve 44 and the outer container 2, and a third valve 46 and a vacuumizing device 47 are sequentially arranged on the branch gas pipeline 45.
Preferably, the number of the gas throttle tubes 40 is several and is uniformly arranged circumferentially around the outer periphery of the inner container 1.
As a further development of the present embodiment, a heat radiation protection and insulation screen 48 is provided in the interlayer space 3, and a plurality of the gas throttle pipes 40 are respectively connected to the heat radiation protection and insulation screen 48.
Preferably, the heat radiation protection and insulation screen 48 includes an outer heat radiation protection and insulation screen 49 and an inner heat radiation protection and insulation screen 50, and the plurality of gas throttle pipes 40 are connected between the outer heat radiation protection and insulation screen 49 and the inner heat radiation protection and insulation screen 50.
In this embodiment, the heat radiation protection and insulation screen 48 is further disposed on the interlayer space 3 at two ends of the inner container 1 and connected to the support rings 38 and 39.
In this embodiment, the heat radiation protection and insulation screen 48 is at least composed of a glass fiber paper layer, a chemical fiber net layer and an aluminized film layer which are sequentially laminated; wherein the aluminized film layer on the outer heat radiation protection and insulation screen 49 is located at the outer side of the outer heat radiation protection and insulation screen 49, and the aluminized film layer on the inner heat radiation protection and insulation screen 50 is located at the inner side of the inner heat radiation protection and insulation screen 50.
In this embodiment, a replaceable molecular sieve adsorber 4 is disposed on the interlayer space 3.
The method for improving the heat insulation effect of the ultralow temperature liquefied gas pressure container for improving the heat insulation effect of the embodiment sequentially comprises the following steps:
(1) The support ring is pre-vacuumized: setting the first valve 43 and the second valve 44 in a closed state, simultaneously opening the third valve 46, vacuumizing the annular hollow cavities of the support rings 38 and 39 through the vacuumizing device 47, and closing the third valve 46 after vacuumizing;
(2) The first valve is opened; when the air pressure in the inner container 1 increases to a certain pressure value, the first valve 43 is opened;
(3) The overpressure relief primary refrigeration: after the first valve 43 is opened, under the action of vacuum suction force of the annular hollow cavity 35 of the first support ring 38, the gas with overpressure enters the annular hollow cavity 35 of the first support ring 38 from the inner container 1 through the first gas pipeline 41, and the gas with overpressure rapidly expands after entering the annular hollow cavity 35 of the first support ring 38, so that the first heat absorption is realized, and meanwhile, the first support ring 38 is cooled;
(4) Overpressure relief secondary refrigeration: under the action of the vacuum suction force of the annular hollow cavity 35 of the second support ring 39, the gas in the annular hollow cavity 35 of the first support ring 38 enters the annular hollow cavity 35 of the second support ring 39 through the gas throttle pipe 40 and rapidly expands in the annular hollow cavity 35 of the second support ring 39, so that the second heat absorption is realized, and meanwhile, the second support ring 39 is cooled;
(5) Vacuumizing and exhausting: the first valve 43 is closed, then the third valve 46 is opened, the endothermic gas in the annular hollow cavities 35 of the support rings 38 and 39 is discharged through the vacuumizing device 47, and the third valve 46 is closed after vacuumizing;
(6) Periodic cooling of the support ring: repeating steps (2) to (5) until the air pressure in the inner container 1 is reduced below a safe pressure value, thereby realizing periodic cooling of the first support ring 38 and the second support ring 39, and playing a role in reducing heat transfer between the support rings 38 and 39 and the inner support heat insulation pad 37 and the outer support heat insulation pad 36, thereby improving the heat insulation effect of the ultra-low temperature liquefied gas pressure container;
the periodic cooling of the first support ring 38 and the second support ring 39 drives the periodic cooling of the heat radiation protection heat insulation screen 48 in the interlayer space, so as to further improve the heat insulation effect of the ultralow temperature liquefied gas pressure vessel.
In this embodiment, the molecular sieve 6 in the molecular sieve adsorber 4 is periodically replaced to increase the vacuum degree in the interlayer space 3, thereby improving the heat insulation effect of the ultralow temperature liquefied gas pressure vessel.
Example 2
The replaceable molecular sieve adsorber of example 1 described above employs the following structure:
the molecular sieve absorber 4 comprises a molecular sieve adsorption box 5 arranged on a tank body of the inner container 1, a molecular sieve 6 filled in the molecular sieve adsorption box 5 and used for absorbing gas and moisture in the interlayer space 3, a box cover 7 arranged on the molecular sieve adsorption box 5 and used for sealing the molecular sieve 6 in the molecular sieve adsorption box 5, and a vacuum environment special two-way valve 8 arranged on a tank body of the outer container 2, wherein an adsorption hole 9 is formed in the box cover 7, a breakable sealing sheet 10 is arranged on the adsorption hole 9, the vacuum environment special two-way valve 8 comprises a valve body 11, an adsorption channel arranged on the valve body 11, a vacuum sealing hole 12 arranged on the adsorption channel, and a thermal expansion sealing plunger 13 arranged on the vacuum sealing hole 12 and used for sealing or opening the adsorption channel, an adsorption pipeline 14 is arranged in the interlayer space 3, one end of the adsorption pipeline 14 is connected with the adsorption hole 9 on the box cover 7, the other end of the adsorption pipeline 14 is connected with one end of the adsorption channel of the valve body 11, and the other end of the adsorption channel 11 is communicated with the interlayer space 3; the molecular sieve adsorption box 5 is also provided with a feeding pipeline 15 and a discharging pipeline 16 for replacing the molecular sieve 6 inside the molecular sieve adsorption box 5, and the feeding pipeline 15 and the discharging pipeline 16 respectively extend to the outside of the tank wall of the outer container 2 and are plugged through a sealing head 17.
The breakable sealing sheet 10 is kept intact during the process of manufacturing and installing the molecular sieve adsorber 4, and is broken by high-pressure nitrogen after the molecular sieve adsorber 4 is installed on the interlayer space 3 and the interlayer space 3 is vacuumized, so that the inside of the molecular sieve adsorption box 5 is communicated with the adsorption channel.
Preferably, the adsorption channel on the valve body 11 includes a main adsorption channel 18, and an inlet side adsorption channel 19 and an outlet side adsorption channel 20 that are respectively and transversely connected to two end sides of the main adsorption channel 18, wherein the main adsorption channel 18 is closed at one end of the inlet side adsorption channel 19, and the vacuum sealing hole 12 is located at one end of the main adsorption channel 18 close to the inlet side adsorption channel 19; a valve cover 21 is arranged at one end of the main adsorption channel 18 near the outlet side adsorption channel 20, a valve cover hole is arranged on the valve cover 21, an electric soldering iron 22 for heating the thermal expansion sealing plunger 13 is inserted into the valve cover hole, and the thermal expansion sealing plunger 13 is connected with the front end of the electric soldering iron heating rod 23 inserted into the main adsorption channel 18; a telescopic corrugated pipe 24 is arranged in the main adsorption channel 18 and positioned at the periphery of the electric soldering iron heating rod 23, one end pipe orifice of the corrugated pipe 24 is in sealing connection with the valve cover 21, and the other end pipe orifice of the corrugated pipe 24 is in sealing connection with the thermal expansion sealing plunger 13.
In this embodiment, the channel diameter of the main adsorption channel 18 is larger than the inner hole diameter of the vacuum sealing hole 12.
In this embodiment, a protective sleeve 25 is disposed on the outer periphery of the bellows 24, and the protective sleeve 25 is fixed on the valve cover 21 and a gap is disposed between the protective sleeve and the bellows 24.
The protective sleeve 25 is provided to support and protect the bellows 24 against excessive deformation of the bellows 24 in the event of an imbalance in the pressure inside and outside the bellows 24.
In this embodiment, a high temperature resistant sealing member 26 is further disposed between the valve cover hole of the valve cover 21 and the electric soldering iron heating rod 23.
Preferably, the valve cover 21 is further provided with a vacuum-pumping pipeline 27 for balancing the internal and external pressures of the bellows 24, and the vacuum-pumping pipeline 27 is connected with a vacuum-pumping device.
Heating the thermal expansion sealing plunger 13 by using the electric iron 22, so that interference sealing fit is realized between the thermal expansion sealing plunger 13 and the vacuum sealing hole 12, and an adsorption channel on the valve body 11 is plugged; by eliminating the heating of the electric iron 22, the heat expansion seal plunger 13 is gradually cooled to be normal, so that clearance fit between the heat expansion seal plunger 13 and the vacuum seal hole 12 is realized, and an adsorption channel on the valve body 11 is opened.
By operating the handle of the electric soldering iron 22, the heat-expandable sealing plunger 13 can be moved away from the vacuum sealing hole 12 or into the vacuum sealing hole 12; when the thermal expansion sealing plunger 13 moves away from the vacuum sealing hole 12, the adsorption channel is in a maximum opening state; after the molecular sieve absorber 4 is installed on the interlayer space 3, the breakable sealing sheet 10 is broken through filling dry high-pressure nitrogen into the feeding pipeline 15, so that the adsorption effect of the molecular sieve 6 in the molecular sieve adsorption box 5 on the gas and the moisture in the interlayer space 3 through the adsorption channels 19, 18 and 20 is realized.
In this embodiment, the valve cover 21 is provided with a valve cover heater 28, and the valve cover heater 28 is used to heat the valve cover 21, so that the valve cover hole on the valve cover 21 is heated and expanded, thereby realizing clearance fit with the heating rod 23 of the electric soldering iron 22; by eliminating the heating of the valve cover heater 28, the valve cover 21 is cooled to be normal, so that the valve cover hole on the valve cover 21 is contracted to realize interference sealing fit with the heating rod 23 of the electric soldering iron 22.
The bonnet heater 28 is deactivated during normal operation of the cryogenic pressure vessel. At this time, the electric iron heating rod 23 is in interference sealing fit with the valve cover hole on the valve cover 21, and the heat expansion sealing plunger 13 at the front end of the electric iron heating rod 23 is in a state of being separated from the vacuum sealing hole 12, so that an adsorption channel which is communicated with the inside of the molecular sieve adsorption box 5 and the interlayer space 3 is formed.
In order to realize high-reliability sealing between the thermal expansion sealing plunger 13 and the vacuum sealing hole 12, a ring-shaped cavity 29 is circumferentially arranged on the valve body 11 and positioned at the periphery of the vacuum sealing hole 12, a cooling liquid inlet hole 30 and a cooling liquid outlet hole 31 are respectively formed in the ring-shaped cavity 29, and the ring-shaped cavity 29 is connected with a cooling system through the cooling liquid inlet hole 30 and the cooling liquid outlet hole 31.
Preferably, the annular cavity 29 is a rectangular annular cavity 29 formed by drilling a hole in the valve body 11.
In this embodiment, a steel wire mesh filtering baffle 32 for blocking the molecular sieve 6 is disposed in the molecular sieve adsorption box 5 through a snap connection, and the steel wire mesh filtering baffle 32 is connected to the inner wall of the molecular sieve adsorption box 5 between the molecular sieve 6 and the box cover 7 and separates the molecular sieve 6 from the box cover 7 by a certain interval; a strainer 33 is provided in the valve body 11 at an inlet portion of the inlet-side suction passage 19.
In this embodiment, the adsorption pipeline 14 and the lid 7, the adsorption pipeline 14 and the valve body 11, the valve cover 21 and the valve body 11, the bellows 24 and the valve cover 21, the bellows 24 and the thermal expansion sealing plunger 13, and the protective sleeve 25 and the valve cover 21 are all welded to form a high vacuum seal.
In this embodiment, the heat expansion seal plunger 13 is connected to the front end of the electric soldering iron heating rod 23 by screw-fitting and fixed by welding.
In this embodiment, the adsorption pipeline may be further modified into a curved adsorption pipeline (as shown in fig. 6), and the curved adsorption pipeline may compensate for the relative displacement between the inner container 1 and the outer container 2 caused by the temperature change.
The molecular sieve replacement method of the replaceable molecular sieve absorber comprises the following steps:
(1) And (3) plugging an adsorption channel: opening the valve cover heater 28 to heat the valve cover 21, so that the valve cover hole on the valve cover 21 expands, and clearance fit between the heating rod 23 of the electric soldering iron 22 and the valve cover hole is realized; then, the handle of the electric soldering iron 22 is operated, so that the heat expansion sealing plunger 13 at the front end of the electric soldering iron heating rod 23 enters the vacuum sealing hole 12 of the valve body 11; then closing the valve cover heater 28, gradually cooling the valve cover 21 to a normal state, so that the valve cover hole on the valve cover 21 is restored to an interference sealing fit state with the electric soldering iron heating rod 23; finally, the electric soldering iron 22 is started to heat the heat expansion sealing plunger 13 at the front end of the electric soldering iron heating rod 23, and the heat expansion sealing plunger 13 is heated and expanded, so that the heat expansion sealing plunger 13 and the vacuum sealing hole 12 are in sealing interference fit, and the adsorption channel of the valve cover 21 is plugged; wherein, after the electric iron 22 is started, a certain heating temperature is maintained so that the adsorption channel is always in a blocking state;
(2) Discharging old materials: removing the sealing heads on the feeding pipeline 15 and the discharging pipeline 16, and discharging the old molecular sieve 6 in the molecular sieve adsorption box 5 from the discharging pipeline 16 by adopting a method of filling compressed air into the feeding pipeline 15 or adopting a method of vacuumizing the discharging pipeline 16;
(3) Adding new materials: arranging a blocking net at the end part of a discharging pipeline 16, and then adding a new molecular sieve into the molecular sieve adsorption box 5 from the feeding pipeline 15 until the molecular sieve adsorption box is full by arranging a feeding pump on a feeding pipeline 15, or sucking the new molecular sieve into the molecular sieve adsorption box 5 from the feeding pipeline 15 until the molecular sieve adsorption box is full by connecting a vacuum pump on the discharging pipeline 16;
(4) Vacuumizing: plugging a feeding pipeline 15, connecting a blocking net and a vacuum pump to a discharging pipeline 16, vacuumizing the inside of the molecular sieve adsorption box 5, and plugging the discharging pipeline 16 after vacuumizing is finished;
(5) The adsorption channel is opened: closing the electric iron 22 to gradually cool the heat expansion seal plunger 13 to a normal state, thereby realizing clearance fit between the heat expansion seal plunger 13 and the vacuum seal hole 12; then the valve cover heater 28 is turned on again, and the valve cover 21 is heated and expanded, so that clearance fit between a valve cover hole on the valve cover 21 and the electric soldering iron heating rod 23 is realized; operating the handle of the electric soldering iron 22, and moving the heat expansion sealing plunger 13 at the front end of the electric soldering iron heating rod 23 away from the vacuum sealing hole 12, so as to realize the opening of the adsorption channel; after the adsorption channel is opened, the valve cover heater 28 is closed, and the valve cover 21 is gradually cooled to be normal, so that the valve cover hole on the valve cover 21 is contracted and is in interference sealing fit with the heating rod 23 of the electric soldering iron 22 again.
As a further improvement of the molecular sieve replacement method in this embodiment, during the process of entering the heat expansion seal plunger 13 into the vacuum seal hole 12 and heating the heat expansion seal plunger 13 by using the electric iron 22, the part of the vacuum seal hole 12 of the valve body 11 is cooled by a cooling system connected to the annular cavity 29 of the valve body 11, so that the reliability of the interference seal fit between the heat expansion seal plunger 13 and the vacuum seal hole 12 is improved.
Preferably, when the pressure imbalance inside and outside the bellows 24 results in a large resistance during the movement of the operating electric iron 22, the evacuation device connected to the evacuation line 27 on the valve cap 21 is turned on to balance the pressure inside and outside the bellows 24.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (4)
1. An ultralow temperature liquefied gas pressure container for improving heat insulation effect is characterized by comprising an inner container, an outer container, an interlayer space formed between the inner container and the outer container and a support assembly supported between the inner container and the outer container, wherein the support assembly comprises a pair of support rings with annular hollow inner cavities, a plurality of outer support heat insulation pads which are arranged at the periphery of the support rings and are arranged at intervals along the circumferential direction and are used for supporting the inner wall of the outer container, and a plurality of inner support heat insulation pads which are arranged at the periphery of the support rings and are arranged at intervals along the circumferential direction and are used for supporting the outer wall of the inner container; the pair of support rings comprises a first support ring and a second support ring, and a gas throttling pipe which is communicated with each other is arranged between the annular hollow inner cavity of the first support ring and the annular hollow inner cavity of the second support ring; a first gas pipeline is led out from the upper gas space position inside the inner container, the first gas pipeline is led out and enters the annular hollow cavity of the first support ring, and a second gas pipeline is led out from the annular hollow cavity of the second support ring; the first gas pipeline is provided with a first valve, the second gas pipeline is provided with a second valve, a branch gas pipeline is arranged on the second gas pipeline at a position between the second valve and the outer container, and a third valve and a vacuumizing device are sequentially arranged on the branch gas pipeline;
the gas throttle pipes are arranged in a plurality and uniformly distributed along the circumferential direction at the periphery of the inner container; a heat radiation protection heat insulation screen is arranged in the interlayer space, and a plurality of gas throttle pipes are respectively connected with the heat radiation protection heat insulation screen; the heat radiation protection heat insulation screen comprises an outer heat radiation protection heat insulation screen and an inner heat radiation protection heat insulation screen, and the plurality of gas throttle pipes are connected between the outer heat radiation protection heat insulation screen and the inner heat radiation protection heat insulation screen; the heat radiation prevention and heat insulation screen is also arranged at the two ends of the inner container in the interlayer space and is connected with the supporting ring; the heat radiation protection and heat insulation screen at least comprises a glass fiber paper layer, a chemical fiber net layer and an aluminized film layer which are sequentially overlapped; the aluminum plating film layer on the outer heat radiation protection heat insulation screen is positioned on the outer side of the outer heat radiation protection heat insulation screen, and the aluminum plating film layer on the inner heat radiation protection heat insulation screen is positioned on the inner side of the inner heat radiation protection heat insulation screen.
2. An ultra-low temperature liquefied gas pressure vessel for enhancing adiabatic effect as claimed in claim 1, wherein a replaceable molecular sieve adsorber is provided on said interlayer space.
3. An ultra-low temperature liquefied gas pressure vessel for enhancing an adiabatic effect as claimed in claim 2, wherein said method for enhancing an adiabatic effect comprises the steps of, in sequence:
(1) The support ring is pre-vacuumized: setting the first valve and the second valve in a closed state, simultaneously opening the third valve, vacuumizing the annular hollow cavity of the support ring through a vacuumizing device, and closing the third valve after vacuumizing;
(2) The first valve is opened; opening the first valve when the air pressure in the inner container increases to a certain pressure value;
(3) The overpressure relief primary refrigeration: after the first valve is opened, under the action of vacuum suction force of the annular hollow inner cavity of the first support ring, the gas with overpressure enters the annular hollow inner cavity of the first support ring from the inner container through the first gas pipeline, and the gas with overpressure rapidly expands after entering the annular hollow inner cavity of the first support ring, so that first heat absorption is realized, and meanwhile, the first support ring is cooled;
(4) Overpressure relief secondary refrigeration: under the action of vacuum suction force of the annular hollow inner cavity of the second support ring, gas in the annular hollow inner cavity of the first support ring enters the annular hollow inner cavity of the second support ring through the gas throttle pipe and rapidly expands in the annular hollow inner cavity of the second support ring, so that second heat absorption is realized, and meanwhile, the second support ring is cooled;
(5) Vacuumizing and exhausting: the first valve is closed, then the third valve is opened, the heat absorbing gas in the annular hollow cavity of the support ring is discharged through the vacuumizing device, and the third valve is closed after vacuumizing;
(6) Periodic cooling of the support ring: repeating the steps (2) to (5) until the air pressure in the inner container is reduced below a safe pressure value, thereby realizing the periodic cooling of the first support ring and the second support ring, and playing a role in reducing the heat transfer between the support ring and the inner support heat insulation pad and between the support ring and the outer support heat insulation pad, and further improving the heat insulation effect of the ultralow temperature liquefied gas pressure container;
the periodic cooling of the first support ring and the second support ring drives the periodic cooling of the heat radiation prevention heat insulation screen in the interlayer space, so that the heat insulation effect of the ultralow temperature liquefied gas pressure container is further improved.
4. An ultra-low temperature liquefied gas pressure vessel for improving insulation according to claim 3, wherein the insulation of the ultra-low temperature liquefied gas pressure vessel is improved by increasing the vacuum degree in the interlayer space by periodically replacing the molecular sieve in the molecular sieve adsorber.
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