CN203668524U - Heat preserved electrolytic tank - Google Patents
Heat preserved electrolytic tank Download PDFInfo
- Publication number
- CN203668524U CN203668524U CN201320762979.7U CN201320762979U CN203668524U CN 203668524 U CN203668524 U CN 203668524U CN 201320762979 U CN201320762979 U CN 201320762979U CN 203668524 U CN203668524 U CN 203668524U
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- CN
- China
- Prior art keywords
- thermal insulation
- heat
- electrolytic tank
- fixed
- gas skirt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 23
- 238000004321 preservation Methods 0.000 claims abstract description 13
- 238000009413 insulation Methods 0.000 claims description 48
- 239000011449 brick Substances 0.000 claims description 32
- 210000005056 cell body Anatomy 0.000 claims description 20
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 239000000945 filler Substances 0.000 claims description 8
- 239000003610 charcoal Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 239000003063 flame retardant Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 abstract description 16
- 239000004411 aluminium Substances 0.000 abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 9
- 239000002362 mulch Substances 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 6
- 239000003792 electrolyte Substances 0.000 abstract description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 6
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 238000005868 electrolysis reaction Methods 0.000 description 15
- 210000004027 cell Anatomy 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000012774 insulation material Substances 0.000 description 9
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 7
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000009866 aluminium metallurgy Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- Electrolytic Production Of Metals (AREA)
Abstract
The utility model provides a heat preserved electrolytic tank. The heat preserved electrolytic tank comprises a tank body and the upper part of the tank, anode carbon blocks fixed on the horizontal bus of the upper part of the tank body, a gas-collecting hood fixed at the upper part of the tank, a blanking pipe fixed at the middle part of the gas-collecting hood and a crust breaking hammer penetrating through the blanking pipe, and is characterized in that the side top and the side wall of the tank body are an active heat preservation tank hood, and a heat preservation cover plate is arranged at the middle top of the tank body and is connected with the gas-collecting hood through a connecting piece. According to the utility model, conventional heat preservation mulches such as aluminium oxide, face-piece blocks and electrolyte blocks are replaced by the active heat preservation hood capable of being replaced rapidly without adding the heat preservation mulches frequently, so that the labor intensity is lowered, the working efficiency is improved, the heat losses are reduced, that the heat preservation mulches fall into the electrolytic tank during the anode replacement and heat preservation mulches addition process can be avoided, therefore, the heat balance and the material balance of the electrolytic tank can't be broken; environmental pollution can be greatly reduced, and the problem that the aluminium oxide can't dissolve and diffuse rapidly since the blanking is only conducted from the centre joint in a large-scale pre-roasting aluminium electrolytic tank is solved.
Description
Technical field
The utility model relates to a kind of thermal insulation electrolytic tank, belongs to electrolysis tech field.
Technical background
With regard to existing fused salt electrolysis process aluminium metallurgy technology, since the beginning of the eighties in last century, through the development of nearly 30 years, reach quite advanced level.But traditional industrial electrolysis aluminum technology still faces great innovation, the especially research and development of the energy-conserving and environment-protective aluminium cell of novel texture, have become the main flow that following cell technologies develops, as many rod irons of cathode carbon pieces technology, the super stable magnetic field technology of aluminium cell etc.In existing Aluminium Electrolysis process, need with aluminum oxide, face-piece piece and electrolyte block as insulation mulch, be subject to the impact of high temperature, dust and high-intensity magnetic field simultaneously, anode carbon block, insulation material loss are large, need frequent anode carbon block, the interpolation insulation material changed, and will the density of insulation material, shape and thickness etc. frequently be adjusted and be safeguarded, guarantee is normally produced.And in the time carrying out aforesaid operations, need to be by manually carrying out a large amount of crust breaking operations, not only labour intensity is large, length consuming time, thermosteresis is large, and in operating process, inevitably can make to be incubated mulch and fall in electrolyzer, thereby destroy electrolyzer heat balance and mass balance, affect electrolytic production quality.In addition, from existing electrolyzer, change on anode scrap charcoal piece out, because adhering to a large amount of insulation materials, can, in the time of potroom, transportation and the cleaning of anode scrap charcoal piece, produce a large amount of airborne dusts, not only have a strong impact on workshop condition, also increased ton aluminium material consumption cost.The cutting mode of existing preroasting aluminium cell, can make aluminum oxide can not dissolve rapidly, spread, thereby affects steadily efficient operation of electrolysis production.Therefore, be necessary prior art to be improved, reduce labour intensity, improve electrolysis of aluminum economic and technical norms.
Summary of the invention
For overcoming prior art above shortcomings, shorten and change the anode carbon block activity duration, while avoiding changing anode carbon block, insulation material is fallen in electrolytic solution and affects materials balance of electrolytic cell and energy balance, reduce labor strength, change large-scale pre-baked burning aluminum cell supplying mode, make aluminum oxide can dissolve rapidly, spread, ensure steadily efficient operation of electrolysis production, the utility model provides a kind of thermal insulation electrolytic tank.
The utility model completes by following technical proposal: a kind of thermal insulation electrolytic tank, comprise cell body and groove top thereof, be fixed on the anode carbon block on cell body upper level bus, be fixed on the gas skirt on groove top, be fixed on the tremie pipe at gas skirt middle part, through the crust breaking hammer of tremie pipe, it is characterized in that cell body side top and sidewall are moving thermal insulation groove cover, in cell body, top arranges heat-preserving cover plate, this heat-preserving cover plate is connected with gas skirt by web member, so that while changing anode carbon block, only need directly hang and move moving thermal insulation groove cover, can hang and move in the lump together with anode carbon block, conveniently save time again, the old anode carbon block hanging away because of without insulation material simultaneously, therefore can not affect materials balance of electrolytic cell.
Described moving thermal insulation groove cover by horizontal cover and vertically cover form, horizontal cover comprises horizontal metal plate, is fixed on successively insulating brick in the middle of at least one deck of horizontal metal plate inner side or/and insulation filler, and one deck refractory brick at least; Vertically cover comprises vertical metal sheet, is fixed on successively insulating brick in the middle of at least one deck of vertical metal sheet inner side or/and insulation filler, and one deck refractory brick at least.
Described moving thermal insulation groove cover comprises by leveling board and vertical plate and connects into L shaped metal shell, leveling board downside is provided with at least one deck insulating brick and at least one deck refractory brick successively, vertical plate inner side is provided with successively at least one deck insulating brick or/and insulation filler, and one deck refractory brick at least.
Described moving thermal insulation groove cover arranges several, concrete quantity is determined according to grooved size and anode quantity, the lower end of each moving thermal insulation groove cover is placed in the pot shell inner side of cell body groove bottom, and be placed on the side wall carbon block of groove bottom, by dust-removal cloth-bag or apply charcoal clay etc. and seal, so as required selectivity carry out new, old moving thermal insulation groove cover and anode carbon block replacing in the lump, hang and move.
Described heat-preserving cover plate comprises horizontal metal plate, is located at successively one layer of heat preservation brick and one deck refractory brick of horizontal metal plate downside.
On described moving thermal insulation groove cover, heat-preserving cover plate, hoisting ring is set, hangs and move with fast and easy.
The web member of described connection heat-preserving cover plate and gas skirt is joist steel, the lower end of joist steel is fixed on heat-preserving cover plate inner side, the lower surface of joist steel is provided with thermal insulation layer and flame retardant coating successively, the upper end of joist steel is placed in heat-preserving cover plate top, and be fixed on gas skirt lower surface, the tremie pipe lower end that is fixed on gas skirt middle part is placed in cell body through joist steel.
Described tremie pipe is the vertical pipe with cavity, the upper and lower end of vertical pipe opens wide, be positioned on the pipeline section of gas skirt and be respectively equipped with the vapor pipe and the feed-pipe that are communicated with cavity, the vapor pipe the other end opens wide, and be placed in gas skirt, the feed-pipe the other end is connected with hopper through gas skirt, so that the gas producing in electrolysis production directly enters after gas skirt through vertical pipe, vapor pipe, discharge through the pipeline being connected with gas skirt, the aluminum oxide powder of being simultaneously convenient in hopper is directly sent into electrolysis in electrolyzer through feed-pipe, vertical pipe again.
The utility model compared with prior art has following advantages and effect: adopt such scheme, can replace aluminum oxide, face-piece piece and the electrolyte block etc. of prior art to be incubated mulch with the movable heat insulation cover of fast changeable easily, without frequently adding again insulation material, replacing anode carbon block is convenient, fast, effectively reduce labour intensity, increase work efficiency, reduce thermosteresis simultaneously, fundamentally avoid insulation mulch to fall in electrolyzer in anode change and insulation material interpolation operation process, and destroyed electrolyzer heat balance and mass balance; And in anode carbon block replacing, transport and pressure-off process, no longer generation insulation mulch flies upward and splashes, and can increase substantially environmental benefit, reduce the material consumption of ton aluminium; Solve large-scale pre-baked burning aluminium cell and only therefrom stitch blanking, the problem that aluminum oxide can not dissolve rapidly, spread, has ensured steadily efficient operation of electrolysis production.
The suitable all preroasting aluminium cells of the utility model are produced, be specially adapted to the production of large-scale pre-baked burning aluminium cell, thoroughly solve large pre-baked cell production anode change labour intensity large, when anode change, material balance and thermal equilibrium are destroyed problem serious, that thermosteresis is large, the material consumption of ton aluminium is large and environmental benefit is poor, significantly improve electrolysis of aluminum economic and technical norms and environmental benefit, and significantly reduce labour intensity.
Brief description of the drawings
Fig. 1 is section structure schematic diagram of the present utility model;
Fig. 2 is the moving thermal insulation groove cover structure enlarged view in Fig. 1;
Fig. 3 is the tremie pipe structure enlarged view in Fig. 1;
Fig. 4 is the utility model structure iron.
In figure, 1 is electrolytic cell body, and 2 is moving thermal insulation groove cover, and 3 is heat-preserving cover plate, 4 is web member, and 5 is vapor pipe, and 6 is tremie pipe, and 7 is feed-pipe, 8 is gas skirt, and 9 is pot shell, and 10 is anode carbon block, and 21 is vertical plate, 22 is insulation filler, and 23 is insulating brick, and 24 is refractory brick, and 25 is hoisting ring, 26 is leveling board, and 27 is insulating brick, and 28 is refractory brick, and 31 is horizontal metal plate, 32 is insulating brick, and 33 is refractory brick, and 61 is crust breaking hammer.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
The thermal insulation electrolytic tank that the utility model provides, comprise cell body 1 and groove top thereof, be fixed on the anode carbon block 10 on cell body 1, be fixed on the gas skirt 8 on groove top, be fixed on the tremie pipe 6 at gas skirt 8 middle parts, through the crust breaking hammer 61 of tremie pipe 6, crust breaking hammer 61 upper ends are connected with power cylinder, side top and the sidewall of cell body 1 are moving thermal insulation groove cover 2, anode carbon block 10 is fixed on groove upper level bus 11, in cell body 1, top arranges heat-preserving cover plate 3, and this heat-preserving cover plate 3 is connected with gas skirt 8 by web member 4, as Fig. 1,4, described moving thermal insulation groove cover 2 comprises by leveling board 26 and vertical plate 21 and connects into L shaped metal shell, leveling board 26 downsides are provided with one layer of heat preservation brick 27 and one deck refractory brick 28 successively, leveling board 26 upside intervals arrange hoisting ring 25, vertical plate 21 inner sides are provided with one layer of heat preservation filler 22 and one layer of heat preservation brick 23 successively, and one deck refractory brick 24, this moving thermal insulation groove cover 2 arranges several, concrete quantity is determined according to grooved size and anode quantity, the lower end of each is positioned at pot shell 9 inner sides of cell body 1 groove bottom, and be placed on the side wall carbon block of groove bottom, seal by dust-removal cloth-bag or coating charcoal clay etc., described heat-preserving cover plate 3 comprises horizontal metal plate 31, is located at successively one layer of heat preservation brick 32 and one deck refractory brick 33 of horizontal metal plate 31 downsides, and horizontal metal plate 31 upsides are provided with hoisting ring, as Fig. 1,2.
Described connection heat-preserving cover plate 3 is joist steel with the web member 4 of gas skirt 8, the lower end of joist steel is fixed on heat-preserving cover plate 3 inner sides, and lower surface is provided with thermal insulation layer and flame retardant coating successively, the upper end of joist steel is placed in heat-preserving cover plate 3 tops, and be fixed on gas skirt 8 lower surfaces, tremie pipe 6 lower ends that are fixed on gas skirt 8 middle parts are placed in cell body 1 through joist steel; Described tremie pipe 6 is the vertical pipe with cavity, the upper and lower end of vertical pipe opens wide, be positioned on tremie pipe 6 pipeline sections of gas skirt 8 and be respectively equipped with the vapor pipe 5 and the feed-pipe 7 that are communicated with cavity, vapor pipe 5 the other ends open wide, and be placed in gas skirt 8, feed-pipe 7 the other ends are connected with hopper through gas skirt 8, as Fig. 1, Fig. 3.
All the other structures of electrolyzer described in the utility model are conventional structure of the prior art.
When work: start as required power cylinder and drive crust breaking hammer 61 crust breakings, equally as required the aluminium powder in hopper is directly sent in cell body 1 and participated in electrolysis production by feed-pipe 7, tremie pipe 6, the gas producing in electrolysis production directly enters after gas skirt 8 through tremie pipe 6, vapor pipe 5, then discharges through the pipeline being connected with gas skirt 8; Need to change anode carbon block 10 according to electrolysis production time, only need directly hang out moving thermal insulation groove cover 2, can hang out in the lump together with anode carbon block 10, hang in the moving thermal insulation groove cover 2 that new anode carbon block 10 is housed simultaneously, can carry out electrolysis production, convenient save time again, the old anode carbon block hanging away because of without insulation material, therefore can not affect materials balance of electrolytic cell and energy balance simultaneously.
Claims (8)
1. kind of thermal insulation electrolytic tank, comprise cell body and groove top thereof, be fixed on the anode carbon block on cell body upper level bus, be fixed on the gas skirt on groove top, be fixed on the tremie pipe at gas skirt middle part, through the crust breaking hammer of tremie pipe, it is characterized in that cell body side top and sidewall are moving thermal insulation groove cover, in cell body, top arranges heat-preserving cover plate, and this heat-preserving cover plate is connected with gas skirt by web member.
2. thermal insulation electrolytic tank according to claim 1, it is characterized in that described moving thermal insulation groove cover by horizontal cover and vertically cover and form, horizontal cover comprises horizontal metal plate, is fixed on successively insulating brick in the middle of at least one deck of horizontal metal plate inner side or/and insulation filler, and one deck refractory brick at least; Vertically cover comprises vertical metal sheet, is fixed on successively insulating brick in the middle of at least one deck of vertical metal sheet inner side or/and insulation filler, and one deck refractory brick at least.
3. thermal insulation electrolytic tank according to claim 1, it is characterized in that described moving thermal insulation groove cover comprises by leveling board and vertical plate connects into L shaped metal shell, leveling board downside is provided with at least one deck insulating brick and at least one deck refractory brick successively, vertical plate inner side is provided with successively at least one deck insulating brick or/and insulation filler, and one deck refractory brick at least.
4. thermal insulation electrolytic tank according to claim 1, it is characterized in that described moving thermal insulation groove cover arranges several, the lower end of each moving thermal insulation groove cover is placed in the pot shell inner side of cell body groove bottom, and is placed on the side wall carbon block of groove bottom, by dust-removal cloth-bag or the sealing of coating charcoal clay.
5. thermal insulation electrolytic tank according to claim 1, is characterized in that described heat-preserving cover plate comprises horizontal metal plate, is located at successively one layer of heat preservation brick and one deck refractory brick of horizontal metal plate downside.
6. thermal insulation electrolytic tank according to claim 1, is characterized in that described moving thermal insulation groove cover or/and hoisting ring is set on heat-preserving cover plate.
7. thermal insulation electrolytic tank according to claim 1, the web member that it is characterized in that described connection heat-preserving cover plate and gas skirt is joist steel, the lower end of joist steel is fixed on heat-preserving cover plate inner side, the lower surface of joist steel is provided with thermal insulation layer and flame retardant coating successively, the upper end of joist steel is placed in heat-preserving cover plate top, and be fixed on gas skirt lower surface, the tremie pipe lower end that is fixed on gas skirt middle part is placed in cell body through joist steel.
8. thermal insulation electrolytic tank according to claim 1, it is characterized in that described tremie pipe is the vertical pipe with cavity, the upper and lower end of vertical pipe opens wide, be positioned on the pipeline section of gas skirt and be respectively equipped with the vapor pipe and the feed-pipe that are communicated with cavity, the vapor pipe the other end opens wide, and be placed in gas skirt, the feed-pipe the other end is connected with hopper through gas skirt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320762979.7U CN203668524U (en) | 2013-11-28 | 2013-11-28 | Heat preserved electrolytic tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320762979.7U CN203668524U (en) | 2013-11-28 | 2013-11-28 | Heat preserved electrolytic tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203668524U true CN203668524U (en) | 2014-06-25 |
Family
ID=50964840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320762979.7U Expired - Lifetime CN203668524U (en) | 2013-11-28 | 2013-11-28 | Heat preserved electrolytic tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203668524U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820813A (en) * | 2013-11-28 | 2014-05-28 | 云南云铝润鑫铝业有限公司 | Heat-preserving electrolytic tank |
| CN106978610A (en) * | 2017-04-10 | 2017-07-25 | 中国铝业股份有限公司 | A kind of method for reducing aluminium cell radiating and groove fume emission |
| CN107012482A (en) * | 2017-04-13 | 2017-08-04 | 中南大学 | A kind of controllable aluminium cell anode covering sealing system and its aluminium cell of application |
| CN108166017A (en) * | 2016-12-07 | 2018-06-15 | 高德金 | A kind of pre-calcining electrolytic cell production technology |
| CN110029358A (en) * | 2019-04-22 | 2019-07-19 | 贵州铝城铝业原材料研究发展有限公司 | A kind of aluminium electroloysis continuous prebaked anode cell complex heat-preservation method and structure |
| CN110029366A (en) * | 2019-04-22 | 2019-07-19 | 贵州铝城铝业原材料研究发展有限公司 | A kind of mechanical steel pawl insulation construction of aluminium electroloysis continuous prebaked anode cell |
-
2013
- 2013-11-28 CN CN201320762979.7U patent/CN203668524U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820813A (en) * | 2013-11-28 | 2014-05-28 | 云南云铝润鑫铝业有限公司 | Heat-preserving electrolytic tank |
| CN103820813B (en) * | 2013-11-28 | 2017-06-20 | 云南云铝润鑫铝业有限公司 | A kind of thermal insulation electrolytic tank |
| CN108166017A (en) * | 2016-12-07 | 2018-06-15 | 高德金 | A kind of pre-calcining electrolytic cell production technology |
| CN106978610A (en) * | 2017-04-10 | 2017-07-25 | 中国铝业股份有限公司 | A kind of method for reducing aluminium cell radiating and groove fume emission |
| CN106978610B (en) * | 2017-04-10 | 2019-04-16 | 中国铝业股份有限公司 | A method of reducing aluminium cell heat dissipation and slot flue gas emission |
| CN107012482A (en) * | 2017-04-13 | 2017-08-04 | 中南大学 | A kind of controllable aluminium cell anode covering sealing system and its aluminium cell of application |
| CN110029358A (en) * | 2019-04-22 | 2019-07-19 | 贵州铝城铝业原材料研究发展有限公司 | A kind of aluminium electroloysis continuous prebaked anode cell complex heat-preservation method and structure |
| CN110029366A (en) * | 2019-04-22 | 2019-07-19 | 贵州铝城铝业原材料研究发展有限公司 | A kind of mechanical steel pawl insulation construction of aluminium electroloysis continuous prebaked anode cell |
| CN110029366B (en) * | 2019-04-22 | 2020-09-22 | 贵州铝城铝业原材料研究发展有限公司 | Aluminum electrolysis continuous prebaked anode mechanical steel claw heat insulation structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140625 |