SU1434302A1 - Method of testing hollow articles with hydraulic pressure - Google Patents

Description

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The invention relates to a testing technique and can be used to control the tightness and strength of hollow products in negative temperature conditions.

The aim of the invention is to expand the technological capabilities of detecting local leakage months, and to simplify the method by eliminating the creation of a containment shell and reducing air flow.

The drawing shows a diagram of the device for implementing the proposed method

The device contains a perforated gas duct 1 placed along the perimeter of the inner wall of the product tank 2 o The heat generator 3 is connected;

Method for testing hollow articles. Hydraulic pressure is realized as follows.

In reservoir 2, a hydrostatic pressure is created. Compressor 4 supplies air to heat generator 3, where it is heated and injected through channel 4 into perforated gas duct 1, which evenly distributes warm air around the entire perimeter of tank 2. Due to the bubble structure, a dynamic heat insulating heated layer is formed, which significantly reduces the intensity of heat exchange between the cooled wall of the product. 2 and mass of water comprised within inside of addition ,, the heat gas flowing on the perforated gas duct 1, prevents ice formation on the constructions of the reservoir 2

Bubble dynamic tagging-isolation structure works as follows.

Bubbles of heated air coming out of the perforated gas duct 1 form a discrete bubble flow of a certain thickness constantly floating on the surface of the water poured into the tank. The bubble flow forms along the walls

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Tanks 2 have a water-air structure with a significantly lower thermal conductivity than water, which helps reduce heat loss of the mass of water in the tank 2.

In addition, the air inside each bubble is preheated. Thus, each air bubble carries a certain amount of heat, which it gives off to the surrounding water as it splashes out, and water is heated in the zone of its most intense cooling — near the outer walls. At the same time, this process goes on equally throughout the movement of puffs, as the surface of the bubble increases due to the change in hydrostatic forces, and thereby the amount of heat released from the air contained in it increases. The temperature inside the foam can be considered almost constant, as the almost isothermal process of air expansion in it is going on.

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The formation of a dynamic thermal insulation puzzy structure reduces the heat loss of water in tank 2 due to a decrease in the thermal conductivity of such a structure at the outer walls and intensive heat supply with the air forming bubbles

All this allows hydraulic testing of tanks for tightness and durability at negative ambient temperatures, and contributes to a reduction in materials and labor resources, as well as in terms of putting tanks into operation.

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Claims (1)

5 claims The method of testing hollow articles with hydraulic pressure under conditions of negative external temperatures by filling the product with a liquid under pressure, creating a thermal insulating layer of warm air on the surface of the product and creating a test pressure in the product, characterized in that thermal insulation layer performed by placing a perforated gas duct inside the product along its perimeter and pumping according to the latest warm air with the formation of a dynamic bubble layer.