Browse Prior Art Database

Cryobaffle Cone Trap

IP.com Disclosure Number: IPCOM000042054D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Carbone, QJ: AUTHOR [+3]

Abstract

The prime objective of a cold trap is to eliminate oil contamination and to trap all condensables in a vacuum system application. There are many cold trap designs on the market today, however, when installed in a pumping system, they do not completely eliminate backstreaming of liquid vapors and in many cases cause inefficiencies of pumping speed by blocking with obstructions. To offset the ineffectiveness and to improve the pumping speed the present design proposes a new cryobaffle cone trap, as depicted in the drawing above. The apparatus illustrated is designed and arranged to reduce or eliminate the backstreaming of oil mist into the vacuum chamber, to trap the condensables such as water vapor, and to improve (increase) the pumping speed. The apparatus consists of three major parts: 1. Trap housing assembly 2 2.

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Cryobaffle Cone Trap

The prime objective of a cold trap is to eliminate oil contamination and to trap all condensables in a vacuum system application. There are many cold trap designs on the market today, however, when installed in a pumping system, they do not completely eliminate backstreaming of liquid vapors and in many cases cause inefficiencies of pumping speed by blocking with obstructions. To offset the ineffectiveness and to improve the pumping speed the present design proposes a new cryobaffle cone trap, as depicted in the drawing above. The apparatus illustrated is designed and arranged to reduce or eliminate the backstreaming of oil mist into the vacuum chamber, to trap the condensables such as water vapor, and to improve (increase) the pumping speed. The apparatus consists of three major parts: 1. Trap housing assembly 2 2. Upper cone baffle 3 3. Lower cone baffle 4 The upper and lower cone baffle are fastened to the conduction bar 1 to form a large, uniform conical umbrella constructed of stainless steel wire mesh. The conduction bar 1 is welded onto the ambient temperature shield in place which is part of cryotrap housing assembly 2, thus providing thermal isolation from the diffusion pump for many hours while not in operation, keeping cryogenic LN2 (liquid nitrogen) temperature regardless of the LN2 level. The optically dense cryobaffle cone assembly 3, 4 is projected from the pump radiant heat by an ambient temperature shield; therefore, it traps...