SU1280359A1 - Method of performing the testing of hollow articles for leakage - Google Patents

Abstract

The invention relates to the determination of the leakage of products by the aquarium method and reduces the loss of working fluid by reducing its evaporation during evacuation. The product is immersed in a chamber with degassing liquid, create excess pressure inside the product. A separating layer is created on the surface of the latter, for example, by placing in a chamber a horizontal, airtight movable perhorod. The space under the partition is completely filled with liquid, and above the partition it is evacuated. Moving the partition ensures that the fluid is evacuated. The leakage of the product is determined by the evolution of gas bubbles. Alternatively, a chamber completely filled with liquid is communicated with an additional container filled with the same liquid. .Cool the surface of the liquid in the additional tank until it begins to transition to the solid state and vacuum the volume above this surface, then (L control is performed. 2 Cp f-crystals.

Description

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The invention relates to a testing technique and can be used to determine leakage by the baroquark method.

The aim of the invention is to reduce the loss of the working fluid by reducing its evaporation during evacuation.

The method for testing hollow articles for leaktightness is implemented as follows.

The controlled product is immersed in a chamber with a degassing liquid, for example, freon, and an overpressure is created inside the product. Then, a separation layer is created on the surface of the liquid by placing a hermetic movable horizontal partition, the space under which is completely filled with liquid, reduces the pressure above the hermetic movable partition. The partition moves in the direction of decreasing pressure, thereby evacuating the degassing liquid, then the product is leaky by evolving gas bubbles from the product.

Alternatively, the chamber, completely filled with liquid, is sealed in the upper part and communicated with an additional small section tank filled with the same liquid. The surface of the liquid in the additional tank is cooled, for example, with liquid nitrogen, up to the beginning of its transition to the solid phase state and vacuuming over this surface is carried out. Then, the leakage of the product is determined by the release of gas bubbles from the product.

Creating a separation layer in the form of a septum, for example, a membrane, or a cooled layer of liquid, respectively, eliminates or significantly reduces the pumping of vapors of the working fluid, allows you to increase the service life of vacuum equipment and eliminate contamination of the air basin, reduce the cost of testing.

Claims (3)

1. A method for testing leaktightness of hollow products by immersing the product in a chamber with out-of-liquid liquid, creating an overpressure inside the product, evacuating the space above the liquid and determining leakage by the release of gas bubbles from the product, in order to reduce fluid loss after immersion products into the degassing liquid, a separation layer is created on the surface of the latter, and the evacuation is carried out over this layer. 2. The method according to claim 2, which is also distinguished by the fact that the separation layer is created by placing in the chamber a hermetic movable horizontal partition so that the space of the chamber under it is completely filled with the out-of-gas fluid. 3. The method according to Claim 1, which means that the chamber, completely filled with out-of-liquid liquid, is sealed in the upper part and communicate with the additional tank filled with the same degassed liquid, and the separating layer is created by cooling the surface of the liquid in the additional tank until it begins its transition to the solid phase state.