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CO.sub.2 cleaning system and method

  • US 5,405,283 A
  • Filed: 11/08/1993
  • Issued: 04/11/1995
  • Est. Priority Date: 11/08/1993
  • Status: Expired due to Term
First Claim
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1. An apparatus for cleaning a workpiece with abrasive CO2 snow, comprising in combination:

  • a nozzle for receiving and expelling liquid CO2 through an orifice sized for directly converting the liquid CO2 into CO2 snow,a body defining a cavity therein, with said nozzle being coupled to said body for ejecting the CO2 snow into said cavity,an exhaust nozzle coupled to said body and said cavity therein for directing the CO2 snow toward the workpiece, andmixing means for receiving and mixing pressurized shop air at ambient temperature with liquid N2 in portions for precooling the shop air to at least 0 degrees F., said mixing means being coupled to said body for directing the cooled shop air into said cavity for cooling the area adjacent to said orifice in said nozzle and for exhausting the CO2 through said exhaust nozzle under pressure, whereby the cooled mixture of shop air and gaseous N2 enhances the efficiency of the direct conversion of the liquid CO2 into CO2 snow particles.

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