A dynamic sealing test device for ultra-low temperature medium
A test device and ultra-low temperature technology, applied in the direction of engine sealing, fluid tightness testing, measuring devices, etc., can solve the problems that are difficult to achieve multi-level and high-precision testing of ultra-low temperature medium dynamic sealing, and achieve complete types and guarantee comprehensiveness , to achieve the effect of test measurement
Active Publication Date: 2020-06-16
DALIAN UNIV OF TECH
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Problems solved by technology
[0006] The present invention aims at the problem that it is difficult for the test device in the prior art to realize the multi-level and high-precision test of the ultra-low temperature medium dynamic seal, and the present invention proposes an ultra-low temperature medium dynamic seal test device
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[0022] In this embodiment, the ultra-low temperature medium is liquid nitrogen, the temperature is lower than -180°C, and the supply pressure is 0.5MPa; the material of the metal stator 1.3 is 316L stainless steel, and the installation port for sensor installation is 66mm in height and 1 / 3 of the circumference in width; The shaft sleeve 2.2 is made of cemented carbide, with an outer diameter of 30mm, a hardness of 55HRC, and a roughness of Ra0.5 after fine grinding; the material of the supporting components such as the base 5.1 is 45 steel; the material of the measuring chamber 1.11 is acrylic; the static sealing ring 1.9 and dynamic sealing ring 1.10 are made of fluorine rubber, and the working temperature range is -20 to 280°C; the front bearing 2.5 and the rear bearing 2.6 are NSK angular contact ball bearings, with an inner diameter of 35mm; the thermal conductivity of the vacuum chamber 2.b is 0; The material of heat insulation sleeve 1.4 is polyimide, its thermal conducti...
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The invention discloses an ultra-low temperature medium dynamic sealing test device, which belongs to the technical field of sealing tests. The dynamic sealing test device includes a stator assembly, a rotor assembly, a slide table, a servo motor assembly and a sensor assembly. The seal to be tested is installed in the stator, and the heat-insulated stator and the vacuum rotor cooperate to form a dynamic seal test structure; the seal and the shaft sleeve can be replaced flexibly, which is convenient for studying the influence of different seal types, structures, and surface textures on the sealing characteristics; The electric motor powers the rotor and achieves speed control. The device greatly improves the heat insulation capacity, avoids the evaporation and gasification of the ultra-low temperature medium caused by external heat transfer, ensures the stability of the test device operation, achieves the purpose of multi-working condition testing of various sealing structures, and realizes the dynamic sealing of ultra-low temperature media Comprehensive, accurate and efficient experimental testing.
Description
technical field [0001] The invention belongs to the technical field of sealing test, and in particular relates to a dynamic sealing test device for ultra-low temperature medium. Background technique [0002] In recent years, ultra-low temperature media such as liquid hydrogen, liquid oxygen, and liquid nitrogen have been widely used in aerospace engine fuel supply, ultra-low temperature cooling processing, and low-temperature minimally invasive surgery. Among them, key components such as the liquid rocket engine turbo pump, the liquid nitrogen internal injection ultra-low temperature machining spindle, and the hollow transmission ultra-low temperature machining handle all involve ultra-low temperature medium dynamic sealing technology. [0003] Reliable sealing is the key to ensure the safe, efficient and stable operation of the above components. Studies have shown that failures caused by sealing problems account for about 12.5% of the total failures of rocket engines, an...
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IPC IPC(8): G01M3/02G01M3/36G01M3/26
CPCG01M3/025G01M3/36G01M3/26F16J15/0887
Inventor 王永青韩灵生刘阔孔繁泽刘海波甘涌泉戴明华
Owner DALIAN UNIV OF TECH