Water Vapor Trap Pump
Tianhan -135℃ water-vapor capture pump. Principle: in high vacuum using oil-diffusion pumps, 80% or more of residual gases are water vapor, oil vapor and other high-boiling vapors. These are slow to remove and contaminate workpieces, reducing yield and quality. A cryogenic pump addresses this by placing a refrigeration coil below -120℃ in the chamber or at the diffusion-pump inlet. Low-temperature condensation rapidly captures residual gases, reducing evacuation time by 60-90% and producing cleaner vacuum. Vacuum can improve by half an order of magnitude, reaching 10⁻⁸ Torr and 10⁻⁵ Pa. Two arrangements are used: 1. Water-vapor trap: the coil is installed between the high-vacuum valve and chamber, inside the chamber, or in upper/lower roll-coating chambers, particularly for outgassing materials in low-temperature plastic and roll coating. Heating/defrosting restores the coil to ambient temperature before opening, preventing atmospheric moisture from freezing and impairing the next evacuation. 2. Cryogenic cold trap: installed at the diffusion-pump inlet below the high-vacuum valve to prevent oil backstreaming and improve pumping speed/vacuum. Because it stays under vacuum, no defrosting unit is required. Either or both can be fitted. The manufacturer's -135℃ pump uses one imported branded compressor, automatic cascade refrigeration, imported refrigeration components and an environmentally oriented mixed refrigerant to replace liquid nitrogen and reduce cost. It offers fast, efficient cooling, low temperature and easy maintenance. Technical references: custom coil shapes can suit equipment. For inlet/outlet feedthroughs, a roughly 20cm thin-wall stainless-steel thermal-insulation section limits heat loss and severe chamber-wall frosting caused by directly welding a cold pipe through the wall. It may use a detachable connection or be welded directly without a gasket. Power-unit and pressure-conversion tables are referenced.
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| Parameter | Value |
|---|---|
| Numbering | A001 |
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