| 摘要 |
705,217. Heat insulation. UNION CARBIDE & CARBON CORPORATION. Oct. 23, 1951 [Nov. 16, 1950]. No. 24778/51. Class 64(2) Gas or vapour released by powder filling an evacuated insulation space between the inner and outer walls 10, 11 of a doublewalled liquefied-gas container is adsorbed and retained by silica gel or other adsorbent material 19 in a chamber 18 which is cooled by the liquefied gas 22 and communicates with the evacuated space through a passage 24, 29 containing a dust filter 25. The adsorbed gas or vapour is driven off at intervals by warming the adsorbing material and connecting the passage 29 to a vacuum pump through a pipe 32 and valves 34. In the form shown, the adsorbent material is warmed when the liquefied gas is removed from the container 10. In a modification, the container 18 is at the bottom of the inner vessel 10, is insulated by a lining of insulating material, e.g. asbestos or glass wool, or by a gas space, and contains an electric heater for driving off the adsorbed gas and .vapour at intervals. In this form, the passage 29 contains a bellows portion to allow for relative expansion of the two casings, and is connected to the dome 24 containing the filter 25 by an external pipe. The powder in the insulating space may be magnesium carbonate, perlite or diatomacecus earth. The dust filter 25 may comprise a filtering membrane formed to have radially extending flutes around a space which is closed at the top and communicates with the passage 29. In another form the container 18 is outside, but in contact with, the inner vessel 10. |
