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1. 发明授权

US5445553A Method and system for cleaning a surface with CO.sub.2 pellets that are delivered through a temperature controlled conduit 失效
标题翻译：用于通过温度控制导管输送的二氧化碳颗粒清洁表面的方法和系统
公开(公告)号：US5445553A
公开(公告)日：1995-08-29
申请号：US7518
申请日：1993-01-22
申请人： Michael A. Cryer , William D. Danielson , Robert A. Babb
发明人： Michael A. Cryer , William D. Danielson , Robert A. Babb
IPC分类号： B23C7/00 , B24C1/00 , B24C3/04 , B24C7/00 , B24B49/14 , B24C3/12
CPC分类号： B24C7/0092 , B24C1/003 , B24C1/086 , B24C3/04 , B24C7/0069 , B24C7/0084
摘要： A system and method for cleaning or removing coatings, such as paint, from a surface with a stream of particles. A carbon dioxide (CO.sub.2) pelletizer forms carbon dioxide pellets, which are delivered by a delivery system against a surface to be cleaned. The delivery system includes a hopper for containing the pellets and a high pressure air supply. A feeder introduces the pellets from the hopper into the high pressure air. The combined high pressure air and pellets are directed along a delivery hose to a nozzle, which directs the air and pellets against a surface to be cleaned. Temperature sensors are provided to monitor the temperature of the pressurized air at various points in the delivery system. Signals from the temperature sensor are provided in a feedback control manner to a control valve. The control valve controls the introduction of liquid nitrogen (N.sub.2) into the air stream at a mixing chamber in the delivery system. In accordance with the invention, the temperature sensors and feedback controls permit maintenance of the temperature of the high pressure air below the sublimation temperature of the pellets as the pellets are delivered by the delivery system, thereby prolonging the life of the pellets and reducing sublimation prior to ejection from the nozzle.
摘要翻译：用于从具有颗粒流的表面清洁或去除涂层（例如油漆）的系统和方法。二氧化碳（CO2）造粒机形成二氧化碳颗粒，其通过递送系统传递到待清洁的表面上。输送系统包括用于容纳颗粒的料斗和高压空气源。进料器将料斗从料斗中引入高压空气中。组合的高压空气和颗粒沿着输送软管被引导到喷嘴，喷嘴将空气和颗粒引导到待清洁的表面上。提供温度传感器来监测输送系统各个点的加压空气的温度。来自温度传感器的信号以反馈控制方式提供给控制阀。控制阀控制在输送系统中的混合室将液氮（N 2）引入空气流中。根据本发明，温度传感器和反馈控制允许在颗粒通过输送系统输送时将高压空气的温度维持在颗粒的升华温度以下，从而延长颗粒的寿命并减少升华从喷嘴喷出。

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