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    • 5. 发明授权
    • Impingement jet freezer and method
    • 冲击式冷冻机和方法
    • US5740678A
    • 1998-04-21
    • US449456
    • 1995-05-24
    • Ron C. LeeMichael K. Sahm
    • Ron C. LeeMichael K. Sahm
    • F25D3/11F25D13/06
    • F25D3/11
    • An impingement freezer having a zoned freezing chamber in which the temperature of each zone is independently controllable so that the temperature profile within the impingement freezer is coldest at a zone adjacent the outlet and warmest at a zone adjacent the inlet for maximum thermodynamic usage of the refrigerant. Additionally, the velocity of each of the impingement jets is independently adjustable from zone to zone so that in the zone adjacent the entrance of the freezing chamber, the impingement jets can be adjusted to have maximum velocity to produce maximum heat transfer coefficients and thereby an acceptable rate of cooling within the impingement jet freezer. Impingement jets are formed within nozzles that are tapered in two orthogonal directions to prevent frost build-up. Circulation within the impingement jet freezer is produced by venturi-like devices driven by vaporization of incoming refrigerant.
    • 具有分区冷冻室的冲击式冷冻室,其中每个区域的温度是独立可控的,使得冲击式冷冻器内的温度分布在邻近出口的区域处是最冷的,并且在邻近入口的区域处最热,以使制冷剂的最大热力学用量 。 另外,每个冲击射流的速度可以从区域到区域独立地调节,使得在与冷冻室的入口相邻的区域中,冲击射流可以被调节为具有最大速度以产生最大传热系数,从而可接受 冲击式冷冻机内的冷却速度。 冲击喷嘴形成在两个正交方向上锥形的喷嘴内,以防止结霜。 冲击式喷射式冷冻机内的循环由通过进入制冷剂的汽化驱动的文氏管状装置产生。
    • 8. 发明授权
    • Point level detector
    • 点电平检测器
    • US5167154A
    • 1992-12-01
    • US790740
    • 1991-11-08
    • Ron C. Lee
    • Ron C. Lee
    • G01F23/22
    • G01F23/22
    • The present invention provides a level detector to sense whether the level of a liquid having a nonambient temperature such as a cryogenic liquid has reached a predetermined point. A stainless steel type T thermocouple probe is provided for generating a temperature signal referrable to absolute temperature. A high thermal conductivity the type T thermocouple probe is adapted to be mounted so that it submerges in the liquid when the level of the liquid has reached the predetermined point tube is, at one end, in good thermal contact with a thermocouple contained within distal end of the thermocouple probe and, at the other end, is exposed to ambient conditions. The high thermal conductivity tube acts to conduct heat between the ambient and the thermocouple. A thermally insulating tube encapsulates the copper tube between its ends so that heat is not dissipated along its length and the temperature signal will be function of a sum of the nonambient temperature of the liquid and a constant divided by a convective heat transfer, which will increase in the liquid. As a result, the temperature signal will change upon submergence of the thermocouple within the liquid to indicate that the liquid has reached the point level detector.