Sealing strip for use in ultralow-temperature places
A sealing strip and ultra-low temperature technology, applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve the problems of lack of sealing, cracking, loss of elasticity, etc., and achieve the effect of convenient operation and simple production
Inactive Publication Date: 2011-01-05
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
[0002] At present, the sealing strips of the cold box used in the ultra-low temperature below -130°C are long strip-shaped sealing strips with a rectangular cross-section made of rubber or felt, such as figure 1 As shown, the sealing strip of this structure has many disadvantages in the ultra-low temperature environment. For example, the sealing strip of rubber material will become embrittled at low temperature, become hard and lose elasticity, and crack, etc., which will cause the seal to fail.
For the sealing strip made of felt and other materials, due to the exhaust gas discharge of the low temperature box, or the leakage of cooling when opening and closing the door, the water vapor in the air will frost and condense into water when it is cold. It will freeze under the action, so that the sealing strip loses its elasticity and cannot achieve the sealing effect
Method used
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[0011] Such as figure 2 As shown, the nickel-chromium alloy heating wire 4 is arranged between the wool felts 1 and 2, and the outside is wrapped with silicon rubber 3 to make a long strip. It is installed on the door or cover of the ultra-low temperature cold box where it needs to be sealed, and it can be sealed by pressing. When the ultra-low temperature cold box is working, the heating wire in the sealing strip is regularly energized to keep its temperature above the hardening temperature of the outer rubber.
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The invention discloses a sealing strip for use in ultralow-temperature places, which belongs to the technical field of ultralow-temperature sealing. The sealing strip is a strip material; the outer layer of the cross section is rubber; two layers of felt are arranged in the middle; and electrical heating wires which can be energized are arranged between the two layers of felt along a length direction. The sealing strip is arranged between the cover or door and the box body of an ultralow-temperature cold box; the electrical heating wires are energized periodically to keep the temperature of the sealing strip higher than the hardening temperature of the outer-layer rubber for preventing the rubber from becoming hard and fragile and cracking in the ultralow-temperature environment; and the rubber can prevent the air from frosting with cold and wetting the felt.
Description
technical field [0001] The invention belongs to the field of ultra-low temperature sealing technology, and in particular relates to a sealing strip used in ultra-low temperature occasions. technical background [0002] At present, the sealing strips of the cold box used in the ultra-low temperature below -130°C are long strip-shaped sealing strips with a rectangular cross-section made of rubber or felt, such as figure 1 As shown, the sealing strip of this structure has many disadvantages in the ultra-low temperature environment. For example, the sealing strip of rubber material will become embrittled at low temperature, become hard, lose elasticity, and crack, etc., thus making the seal invalid. For the sealing strip made of felt and other materials, due to the exhaust gas discharge of the low temperature box, or the leakage of cooling when opening and closing the door, the water vapor in the air will frost and condense into water when it is cold. It will freeze under the a...
Claims
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Inventor 刘志奇闫献国宋建丽成俊秀李永堂
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY