CN203810714U - Vacuumizing drying room for vacuum insulation deep freeze refrigeration plant - Google Patents
Vacuumizing drying room for vacuum insulation deep freeze refrigeration plant Download PDFInfo
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- CN203810714U CN203810714U CN201420145680.1U CN201420145680U CN203810714U CN 203810714 U CN203810714 U CN 203810714U CN 201420145680 U CN201420145680 U CN 201420145680U CN 203810714 U CN203810714 U CN 203810714U
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Abstract
The utility model discloses a vacuumizing drying room for a vacuum insulation deep freeze refrigeration plant. The vacuumizing drying room comprises a drying room, a drying room door, multilayer insulating containers in the drying room, an external circulating air system, an internal circulating air system, a temperature pressure control system and a hot air displacement system; the external circulating air system comprises a hot-blast stove, an external circulating fan, an external circulating air supply pipe, an external circulating air return pipe and an automatic control system; the internal circulating air system comprises an internal circulating fan, an internal circulating air return pipe, an internal circulating fan arranged on the external circulating air supply pipe and an electric heater; the temperature pressure control system comprises an induced draft fan, a bypass air pipe, a shut-off valve, temperature sensors connected with a PLC (Programmable Logic Controller) system as well as a differential pressure sensor. The vacuumizing drying room disclosed by the utility model has the advantages that energy conservation and consumption reduction are realized, i.e., a mode of the vacuumizing drying room saves 10-15 percent of energy compared with a mode of resistance heating; the safety is realized, so that the leakage of hot air is avoided; environment friendliness is realized, so that the influence on the environment is avoided; the vacuumizing drying room is stable in operation, so that the great fluctuation of the temperature in the drying room can be avoided and the balance of the temperature in the drying room is ensured.
Description
Technical field
The utility model relates to a kind of vacuum insulation deep freeze refrigeration plant and vacuumizes drying room, especially relate to a kind of for vacuum insulation deep freeze refrigeration plant the drying room device in the residing hot environment of vacuum, be the Novel drying room device of a kind of energy-conservation, safety, environmental protection, stable operation.
Background technology
Along with the development of Cryo Heat Insulation accumulating industry reaches its maturity, also flourish on affecting every research of Cryo Heat Insulation accumulating.Cryo Heat Insulation mainly divides vacuum insulation, vacuum-powders insulation, vacuum fiber insulation and high vacuum multiple layer heat insulation several adiabatic forms.Wherein high vacuum multiple layer heat insulation, because heat-insulating property is good, simple process obtains favor, extensively uses in fields such as small-sized low temperature insulation container made and even low-temperature tankers, and has the trend that progressively expands application.Affecting in the factors of multilayer heat insulation performance, vacuum plays very crucial effect.The vacuum having obtained becomes one of key factor of manufacturing by high-quality high vacuum multiple layer heat insulation container, and this has just proposed very harsh requirement to evacuation process.The factor that affects evacuation process is a lot, and the hot blast temperature, the hot blast flow regime that wherein vacuumize drying room are also one of its factors, main because at high temperature the molecular kinetic energy of the interior gas of interlayer is strengthened, and is conducive to be sucked.Simultaneously high temperature has accelerated the outgassing rate of material, obtaining and maintaining guarantee is provided for vacuum.
Can realize by the temperature maintaining inside and outside container the requirement of vacuum insulation deep freeze refrigeration plant environment temperature of living in.Traditional process is to adopt resistance heated mode to heat the temperature of gas in drying room at present, then makes the gas circulation in drying room by outdoor circulating wind machine.There is the uppity shortcoming of air temperature and current in the method, and has certain potential safety hazard at secure context.The shortcoming of traditional resistance heated mode is in particular in:
1) heating that resistance heated adopts is selected nichrome (1000 DEG C following) conventionally, the operating voltage of heating should be not too high, the cause at high temperature insulaion resistance of refractory material sharply declines, the evaporation of heating increases, insulator surface conductance increases, between electrode, easily produce arc discharge, increased the danger in work.Overtension, heating is carefully grown, and cause difficulty and shortening in service life are installed, brownout, heating is thick and short, and element consumption increases, and has improved cost.
2) air volumetric expansion in heating process in drying room, causes drying room internal pressure to raise, and as poorly sealed in drying room, hot-air leaks, and easily injures other people.
3) adopt resistance heated mode, can make temperature in drying room be difficult for balanced and wayward.
Summary of the invention
The purpose of this utility model is for deficiency of the prior art, make high vacuum multiple layer heat insulation container in the time vacuumizing, have a good temperature environment, can accelerate the outgassing rate of material in container interlayer, obtaining and maintaining and provide safeguard for vacuum, provide a kind of fuel gas hot-blast stove that adopts to produce the mode that in hot flue gas and drying room, gas mixes, reach the drying room that vacuumizes that the setting of the interior temperature of drying room requires.
The purpose of this utility model is achieved through the following technical solutions:
A kind of vacuum insulation deep freeze refrigeration plant vacuumizes drying room, comprises multilayer insulation container 3, outer circulation wind system, interior wind circulating system, temperature, pressure control system and hot blast exchange system in drying room 1, drying room door 2, drying room 1.
Described outer circulation wind system comprises hot-blast stove 6, outer circulation blower fan 7, outer circulation ajutage 12, outer circulation backwind tube 13, one end of described outer circulation ajutage 12 is connected with the outlet of hot-blast stove 6, the other end enters drying room 1 inside from drying room 1 bottom, and described outer circulation ajutage 12 is provided with outer circulation blower fan 7; Described drying room 1 top is provided with outer circulation backwind tube 13, and the circulating air entrance of outer circulation backwind tube 13 and hot-blast stove 6 is connected; The gas inlet place of described hot-blast stove 6 is also provided with natural gas adjusting valve 9.
Preferably, described outer circulation ajutage 12 is provided with 3～8 air outlets in drying room 1 bottom, and described outer circulation backwind tube 13 is provided with 3～8 return air inlets at drying room top.
Described interior wind circulating system comprise interior circulation ajutage 15, in loop back airduct 14, be arranged on interior circulating fan 5 and electric heater 4 on interior circulation ajutage 15, one end of described interior circulation ajutage 15 is connected with outer circulation backwind tube 13, the other end enters multilayer heat insulating vessel 3 inside, loops back airduct 14 in described and draws from multilayer heat insulating vessel 3 inside and be connected with outer circulation backwind tube 13.
Described temperature, pressure control system comprises air-introduced machine 8, lie airduct 16, stop valve 10, the temperature sensor and the differential pressure pick-up 23 that are connected with PLC system; The first temperature sensor 18 is arranged on the outlet of outer circulation blower fan 7, the first described temperature sensor 18 and natural gas adjusting valve 9 interlocked control; The second temperature sensor 19 is arranged on outer circulation backwind tube 13; Three-temperature sensor 20 is arranged on electric heater 4 exits on interior circulation ajutage 15; The 4th temperature sensor 21 is arranged on one end, drying room top; Described lie airduct 16 is connected with outer circulation backwind tube 13, is provided with stop valve 10 on lie airduct 16, and described differential pressure pick-up 23 is arranged on drying room 1 top, and and air-introduced machine 8 interlocked control.
Preferably, be also provided with the 5th temperature sensor 22 at the other end at drying room 1 top.
Information is delivered to PLC system by temperature sensor, can monitor in real time the state of temperature that vacuumizes drying room system.Regulate the flow of natural gas on hot-blast stove and outer circulation return air gas fully to mix with the high-temperature flue gas that hot-blast stove produces by setting the control mode of temperature, employing outer circulation blower fan wind pushing temperature and natural gas adjusting valve interlocking on outer circulation ajutage, can control the temperature that enters hot gas in drying room.Can know the air flow direction of temperature equalization degree, hot gas in drying room by these temperature informations.According to vacuumizing requirement, the temperature of described outer circulation hot blast is 110～200 DEG C; The temperature of interior circulating air is higher 20 DEG C than the temperature of outer circulation hot blast, and because interior circulating air derives from the hot blast on outer circulation backwind tube, its intensification is more constant, therefore add thermal recovery resistance heated mode, is heated to 130～220 DEG C through electric heater.
In drying room, hot blast is in temperature-rise period, due to hot blast volumetric expansion in temperature-rise period, can make drying room internal pressure raise, if drying room internal pressure is higher than pressure outside, have certain potential safety hazard, for ensureing there is certain micro-negative pressure in drying room, be provided with an air-introduced machine with variable-frequency motor, interlocking is controlled in air-introduced machine and the instruction of drying room indoor and outdoor pressure reduction, and ensureing has certain micro-negative pressure in drying room.
Described hot blast exchange system comprises induced duct 17, air-introduced machine 8, air channel check valve 11 and online oxygen analyser 24, described air channel check valve 11 is arranged on the one end at drying room 1 top, described online oxygen analyser 24 is arranged on drying room 1 top, and described induced duct 17 is connected with outer circulation ajutage 12.Start air-introduced machine, hot gas in drying room is discharged from induced duct through outer circulation wind system, for making the air pressure balance in drying room, fresh air enters drying room by air channel check valve, until in drying room oxygen content higher than 18% and drying room in temperature lower than 40 DEG C, close air-introduced machine.
The utility model also provides a kind of multilayer heat insulating vessel vacuum pumping method, comprising: use outer circulation wind system continuously the hot blast that is heated to 110-200 DEG C to be sent in drying room, multilayer heat insulating vessel outer cylinder body is heated; In using, wind circulating system is sent into the hot blast that is heated to 130-220 DEG C in multilayer heat insulating vessel continuously; Under the state simultaneously heating at the outer cylinder body to multilayer heat insulating vessel and inner bag, use vacuum plant to vacuumize the interlayer between multilayer heat insulating vessel outer cylinder body and inner bag.
The technological process that vacuumizes drying room is as follows: open the related valve for the treatment of evacuated vellel, connect and vacuumize flexible pipe, interior circulating air import and export flexible pipe, close drying room door.Start-up temperature control pressurer system, inside and outside circulating fan, after fan operation is normal, starts hot-blast stove and electric heater,, treats that temperature in drying room rises to set temperature and keep slowly by the gas heating in drying room by outer circulation hot-air system; Interior circulating air is heated to and sets temperature and send into multilayer heat insulating vessel inside through electric heater again by interior circulating fan, and after internal tank circulation, return air is to outer circulation backwind tube, until vacuum insulation deep freeze refrigeration plant vacuumizes end.
Set the temperature in drying room according to the requirement of different vacuum insulation deep freeze refrigeration plants.
While work in drying room, outer circulation hot blast is delivered to wind-guiding trench in drying room by outer circulation blower fan through outer circulation ajutage, hot air flow is to from bottom to top, in order to maintain the temperature environment of outside of containers, the hot gas that outer circulation hot blast produces with hot-blast stove through drying room top outer circulation backwind tube mixes by outer circulation blower fan to be sent in drying room again, and so circulation is until the interior temperature of drying room remains constant.
Vacuumize after end, close interior wind circulating system and outer circulation blower fan system, detect the oxygen content of gas in drying room by oxygen analyser, if oxygen content <18% starts hot blast exchange system, replace the gas in drying room by air-introduced machine, introduce fresh air, until oxygen content higher than 18% and drying room in temperature lower than 40 DEG C, close air-introduced machine, open drying room door, remove vacuum insulation deep freeze refrigeration plant (multilayer heat insulating vessel).
The beneficial effects of the utility model:
The utility model be a kind of for high vacuum multiple layer heat insulation container the drying room device in the residing hot environment of vacuum, apparatus structure is reasonable, adopt hot-blast stove air supply mode, can make thermally insulated container in the time vacuumizing, have a stable temperature environment, also can realize energy-saving and cost-reducing, safety and environmental protection, stable operation simultaneously, there is following beneficial effect:
1) adopt the direct mode of heating of hot-blast stove, directly mix with gas in drying room for the hot gas that fuel was produced with natural gas, drying room is carried out to circulating-heating, heat transfer efficiency improves, take full advantage of the heat that burning produces, reduced heat loss, heat transfer efficiency has improved 10～15% than traditional resistor efficiency; And smoke components is CO
2, H
2o, N
2, O
2, can not impact environment, meet atmosphere pollutants emission standards;
2) drying room internal pressure, in the cyclic process of hot blast, adopts the mode of the variable-frequency motor interlocking of drying room inside and outside differential pressure and air-introduced machine, by controlling gas flow on outer circulation air return pipeline, can make it reach micro-negative pressure, has avoided leaking of hot blast;
3) according to the setting of temperature in drying room, adopt the method for the control valve interlocking on outer circulation fan outlet temperature and natural gas line, regulate the air inflow of natural gas, can there is not large fluctuation in the temperature of controlling in drying room, ensure the equilibrium degree of temperature in drying room;
4) in drying room, the supply of hot blast adopts the above mode of return air of lower air-supply, can make hot blast steady flow in drying room, can make blower fan work near best efficiency point.
Brief description of the drawings
Fig. 1 is the structural representation that the utility model vacuum insulation deep freeze refrigeration plant vacuumizes drying room.
In Fig. 1, 1-drying room, 2-drying room door, 3-multilayer heat insulating vessel, 4-electric heater, circulating fan in 5-, 6-hot-blast stove, 7-outer circulation blower fan, 8-air-introduced machine, 9-natural gas adjusting valve, 10-stop valve, 11-air channel check valve, 12-outer circulation ajutage, 13-outer circulation backwind tube, in 14-, loop back airduct, circulation ajutage in 15-, 16-lie airduct, 17-induced duct, 18-the first temperature sensor, 19-the second temperature sensor, 20-three-temperature sensor, 21-the 4th temperature sensor, 22-the 5th temperature sensor, 23-differential pressure pick-up, the online oxygen analyser of 24-.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
For impelling vacuum insulation deep freeze refrigeration plant to have good vacuumizing effect, as shown in Figure 1, a kind of vacuum insulation deep freeze refrigeration plant vacuumizes drying room, comprises multilayer insulation container 3, outer circulation wind system, interior wind circulating system, temperature, pressure control system and hot blast exchange system in drying room 1, drying room door 2, drying room 1.
Described outer circulation wind system comprises hot-blast stove 6, outer circulation blower fan 7, outer circulation ajutage 12, outer circulation backwind tube 13, one end of described outer circulation ajutage 12 is connected with the outlet of hot-blast stove 6, the other end enters drying room 1 inside from drying room 1 bottom, and outer circulation ajutage 12 drying room 1 bottoms are distributed with 6 air outlets; Described outer circulation ajutage 12 is provided with outer circulation blower fan 7; Described drying room 1 top is provided with outer circulation backwind tube 13, and outer circulation backwind tube 13 is distributed with 3 return air inlets at drying room 1 top, and the circulating air entrance of outer circulation backwind tube 13 and hot-blast stove 6 is connected; The gas inlet place of described hot-blast stove 6 is also provided with natural gas adjusting valve 9.
Described interior wind circulating system comprise interior circulation ajutage 15, in loop back airduct 14, be arranged on interior circulating fan 5 and electric heater 4 on interior circulation ajutage 15, one end of described interior circulation ajutage 15 is connected with outer circulation backwind tube 13, the other end enters multilayer heat insulating vessel 3 inside, loops back airduct 14 in described and draws from multilayer heat insulating vessel 3 inside and be connected with outer circulation backwind tube 13.
Described temperature, pressure control system comprises air-introduced machine 8, lie airduct 16, stop valve 10, the temperature sensor and the differential pressure pick-up 23 that are connected with PLC system; The first temperature sensor 18 is arranged on the outlet of outer circulation blower fan 7, the first described temperature sensor 18 and the chain control of natural gas adjusting valve 9; The second temperature sensor 19 is arranged on outer circulation backwind tube 13; Three-temperature sensor 20 is arranged on electric heater 4 exits on interior circulation ajutage 15; The 4th temperature sensor 21 and the 5th temperature sensor 22 are separately positioned on two ends, drying room top; Described lie airduct 16 is connected with outer circulation backwind tube 13, is provided with stop valve 10 on lie airduct 16, and described differential pressure pick-up 23 is arranged on drying room 1 top, and and air-introduced machine 8 interlocked control.
Described hot blast exchange system comprises induced duct 17, air-introduced machine 8, air channel check valve 11 and online oxygen analyser 24, described air channel check valve 11 is arranged on the one end at drying room 1 top, described online oxygen analyser 24 is arranged on drying room 1 top, and described induced duct 17 is connected with outer circulation ajutage 12.
Information is delivered to PLC system by temperature sensor, can monitor in real time the state of temperature that vacuumizes drying room system.Regulate the flow of natural gas on hot-blast stove and outer circulation return air gas fully to mix with the high-temperature flue gas that hot-blast stove produces by temperature, the employing set on outer circulation ajutage with the control mode of natural gas adjusting valve interlocking, can control the temperature that enters hot gas in drying room.Can know the air flow direction of temperature equalization degree, hot gas in drying room by these temperature informations.According to vacuumizing requirement, the temperature of described outer circulation hot blast is 110～200 DEG C; The temperature of interior circulating air is higher 20 DEG C than the temperature of outer circulation hot blast, and because interior circulating air derives from the hot blast on outer circulation backwind tube, its intensification is more constant, therefore add thermal recovery resistance heated mode, is heated to 130～220 DEG C through electric heater.
In drying room, hot blast is in temperature-rise period, due to hot blast volumetric expansion in temperature-rise period, can make drying room internal pressure raise, if drying room internal pressure is higher than pressure outside, have certain potential safety hazard, for ensureing there is certain micro-negative pressure in drying room, be provided with an air-introduced machine with variable-frequency motor, interlocking is controlled in air-introduced machine and the instruction of drying room indoor and outdoor pressure reduction, and ensureing has certain micro-negative pressure in drying room.
The technological process that vacuumizes drying room is as follows:
Open the related valve for the treatment of evacuated vellel, connect vacuumize flexible pipe, interior circulation ajutage, in loop back airduct, close drying room door, start to vacuumize.In startup, outer circulation blower fan, after fan operation is normal, start hot-blast stove and electric heater, set the outlet temperature of outer circulation blower fan, regulate the flow of natural gas adjusting valve by the first temperature sensor monitors outlet temperature, the temperature of controlling outer circulation hot blast is 110～200 DEG C, enter and vacuumize drying room by outer circulation ajutage, hot blast is entered after hot-blast stove fully mixes with the hot gas of hot-blast stove generation and is again delivered to drying room by outer circulation blower fan by outer circulation backwind tube, so move in circles, slowly by the gas heating in drying room, treating that temperature in drying room rises to sets temperature and keeps, interior circulating air comes from outer circulation backwind tube, interior circulating air is heated to 130～220 DEG C by interior circulating fan through electric heater and sends into multilayer heat insulating vessel inside, after internal tank circulation, return air is to outer circulation backwind tube, in introducing by interior circulating fan, circulation ajutage is sent into multilayer heat insulating vessel inside through electric heater heating again, so move in circles, until vacuum insulation deep freeze refrigeration plant vacuumizes end.
Wherein, outer circulation backwind tube hot blast is out to distribute by the air force of outer circulation blower fan and interior circulating fan outer circulation hot-air system and the interior circulating air system of entering.
Vacuumize after end, close interior wind circulating system and outer circulation wind system, detect the oxygen content of gas in drying room by online oxygen analyser 24, if oxygen content <18% starts hot blast exchange system, start air-introduced machine 8, the interior hot blast of drying room 1 is discharged, and for making the air pressure balance in drying room, fresh air enters drying room 1 by air channel check valve 11, until drying room in oxygen content higher than 18% and temperature lower than 40 DEG C, close air-introduced machine 8.Open drying room door 2, remove multilayer heat insulating vessel 3.
Claims (5)
1. a vacuum insulation deep freeze refrigeration plant vacuumizes drying room, comprise the multilayer insulation container (3) in drying room (1), drying room door (2), drying room (1), characterized by further comprising outer circulation wind system, interior wind circulating system, temperature, pressure control system and hot blast exchange system;
Described outer circulation wind system comprises hot-blast stove (6), outer circulation blower fan (7), outer circulation ajutage (12), outer circulation backwind tube (13), one end of described outer circulation ajutage (12) is connected with the outlet of hot-blast stove (6), the other end enters drying room (1) inside from drying room (1) bottom, and described outer circulation ajutage (12) is provided with outer circulation blower fan (7); Described drying room (1) top is provided with outer circulation backwind tube (13), and outer circulation backwind tube (13) is connected with the circulating air entrance of hot-blast stove (6); The gas inlet place of described hot-blast stove (6) is also provided with natural gas adjusting valve (9);
Described interior wind circulating system comprise interior circulation ajutage (15), in loop back airduct (14), be arranged on interior circulating fan (5) and electric heater (4) on interior circulation ajutage (15), one end of described interior circulation ajutage (15) is connected with outer circulation backwind tube (13), the other end enters multilayer heat insulating vessel (3) inside, loops back airduct (14) in described and draws from multilayer heat insulating vessel (3) inside and be connected with outer circulation backwind tube (13);
Described temperature, pressure control system comprises air-introduced machine (8), lie airduct (16), stop valve (10), the temperature sensor being connected with PLC system and differential pressure pick-up (23); The first temperature sensor (18) is arranged on the outlet of outer circulation blower fan (7), described the first temperature sensor (18) and natural gas adjusting valve (9) interlocked control; The second temperature sensor (19) is arranged on outer circulation backwind tube (13); Three-temperature sensor (20) is arranged on electric heater (4) exit on interior circulation ajutage (15); The 4th temperature sensor (21) is arranged on drying room (1) one end, top; Described lie airduct (16) is connected with outer circulation backwind tube (13), on lie airduct (16), be provided with stop valve (10), described differential pressure pick-up (23) is arranged on drying room (1) top, and and air-introduced machine (8) interlocked control.
2. vacuum insulation deep freeze refrigeration plant according to claim 1 vacuumizes drying room, it is characterized in that described hot blast exchange system comprises induced duct (17), air-introduced machine (8), air channel check valve (11) and online oxygen analyser (24), described air channel check valve (11) is arranged on the one end at drying room (1) top, described online oxygen analyser (24) is arranged on drying room (1) top, and described induced duct (17) is connected with outer circulation ajutage (12).
3. vacuum insulation deep freeze refrigeration plant according to claim 1 vacuumizes drying room, it is characterized in that being also provided with the 5th temperature sensor (22) at the other end at drying room (1) top.
4. vacuum insulation deep freeze refrigeration plant according to claim 1 vacuumizes drying room, it is characterized in that described air-introduced machine (8) is the air-introduced machine with variable-frequency motor.
5. vacuum insulation deep freeze refrigeration plant according to claim 1 vacuumizes drying room, it is characterized in that described outer circulation ajutage (12) is provided with 3～8 air outlets in drying room (1) bottom, described outer circulation backwind tube (13) is provided with 3～8 return air inlets at drying room (1) top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420145680.1U CN203810714U (en) | 2014-03-27 | 2014-03-27 | Vacuumizing drying room for vacuum insulation deep freeze refrigeration plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420145680.1U CN203810714U (en) | 2014-03-27 | 2014-03-27 | Vacuumizing drying room for vacuum insulation deep freeze refrigeration plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203810714U true CN203810714U (en) | 2014-09-03 |
Family
ID=51449455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420145680.1U Withdrawn - After Issue CN203810714U (en) | 2014-03-27 | 2014-03-27 | Vacuumizing drying room for vacuum insulation deep freeze refrigeration plant |
Country Status (1)
| Country | Link |
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| CN (1) | CN203810714U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949329A (en) * | 2014-03-27 | 2015-09-30 | 江苏清涵环保科技有限公司 | Vacuuming drying room for vacuum-insulated cryogenic equipment |
| CN111810834A (en) * | 2020-08-05 | 2020-10-23 | 杭州富士达特种材料股份有限公司 | Vacuum obtaining system and method for vacuum multilayer heat insulation low-temperature container interlayer |
| CN111810832A (en) * | 2020-08-05 | 2020-10-23 | 杭州富士达特种材料股份有限公司 | Vacuum multilayer heat-insulation low-temperature container interlayer nitrogen flushing and replacing system and method |
-
2014
- 2014-03-27 CN CN201420145680.1U patent/CN203810714U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949329A (en) * | 2014-03-27 | 2015-09-30 | 江苏清涵环保科技有限公司 | Vacuuming drying room for vacuum-insulated cryogenic equipment |
| CN104949329B (en) * | 2014-03-27 | 2017-07-28 | 江苏清涵环保科技有限公司 | Vacuum insulation deep freeze refrigeration plant vacuumizes drying room |
| CN111810834A (en) * | 2020-08-05 | 2020-10-23 | 杭州富士达特种材料股份有限公司 | Vacuum obtaining system and method for vacuum multilayer heat insulation low-temperature container interlayer |
| CN111810832A (en) * | 2020-08-05 | 2020-10-23 | 杭州富士达特种材料股份有限公司 | Vacuum multilayer heat-insulation low-temperature container interlayer nitrogen flushing and replacing system and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140903 Effective date of abandoning: 20170728 |