초록

Methods and apparatus for pressure equalization port devices, which are particularly suited for preventing vacuum seals in ultra low freezers are disclosed. An application of the pressure equalization port method and apparatus to ultra low freezers is also disclosed.

대표청구항 ▼

1. A pressure equalization port mounted within an insulated wall of a sealed chamber, comprising:a non-conductive exterior tube; a conductive interior tube mounted within said non-conductive exterior tube, said conductive interior tube includes an end exposed to a high pressure area and an end expos

1. A pressure equalization port mounted within an insulated wall of a sealed chamber, comprising:a non-conductive exterior tube; a conductive interior tube mounted within said non-conductive exterior tube, said conductive interior tube includes an end exposed to a high pressure area and an end exposed to a low pressure area; and a heater mounted within said non-conductive tube and said heater surrounds said conductive interior tube, wherein said insulated wall is exposed to a pressure gradient with said low pressure area on one side of the insulated wall and said high pressure area on the other, said pressure gradient causing air to flow from the high pressure area to the low pressure area through said conductive interior tube.