RU1800177C - Bellows for gaseous and fluid media - Google Patents

Abstract

Usage: in valve industry. SUMMARY OF THE INVENTION: Corrugations are located between the inlet and outlet nozzles. The inner elastic cylindrical shell is fixed to the nozzle and overlaps the inner surface of the corrugations. Corrugate the outside of the mesh braid. The inner shell is made of an impermeable smooth film material, is tightly fixed to the inlet pipe and abuts against the inner surface of the corrugations, in which longitudinal hemispherical grooves are formed. In the inner shell opposite the last corrugation made radial holes. 2 il ..

Description

FIELD OF THE INVENTION This invention relates to valve engineering, in particular to flexible connecting conduits.

The aim of the invention is to reduce the hydroresistance of the bellows, as well as ensuring tight contact of the inner coating with the inner corrugations of the bellows.

Figure 1 shows a bellows axial section; figure 2 is a section aa in figure 1.

The bellows contains an inlet pipe 1, an output pipe 2, an outer braid 3, a corrugation 4, an internal ceiling 5 made in the form of a cylinder.

In the inner corrugations 4, axial channels 6 are made, for example, hemispherical shapes, in order to equalize the pressure of the medium in the cavity between the overlap 5 and the inner corrugations 4, which makes it possible to ensure tight contact between the overlap 5 and the inner corrugations 4.

The bellows works as follows.

The working fluid in a gaseous or liquid state moves along the inner surface of the ceiling 5. The flow along the ceiling 5 is equivalent to the flow through a smooth pipe.

The approach to the outlet pipe 2, due to losses, the flow has a pressure lower than at the inlet to the bellows, passes through the radial holes 7 into the axial channels 6 and equalizes the pressure in the cavity between the overlap 5 and the inner corrugations 4 with the flow pressure at the outlet of the bellows. Due to the fact that the flow pressure at the inlet to the bellows is greater than at the outlet of the bellows, the overlap is tightly pressed against the inner corrugations.

Comparative tests of bellows without overlap and with overlap 5 revealed the advantages of the latter. The bellows were tested with a bore diameter of 006 m and a length of 0.32 m. Overlap 5 is made of wire

ate G

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oh oh

h

VI

nets with a wire diameter of 0.0005 m and a mesh size of 0.0005x0.0005 m. and also from an impermeable film with a thickness of 0.001 m. As a result of tests, it was found that setting the overlap 5 of the wire mesh eliminates vortex formation and reduces the hydroresistance of the bellows by 15.4 %, and setting the overlap 5 from an impermeable film reduces the hydroresistance of the bellows by 50.8% at a flow rate of 0.25 kg / s.

Claims (1)

SUMMARY OF THE INVENTION Bellows for Gaseous and Liquid Media Containing Inlet Vi Outlet Path cuttings, between them the corrugations, an inner elastic cylindrical shell fixed on the nozzle and overlapping the inner surface of the corrugations, characterized in that the corrugations are externally covered with a mesh braid, and the inner shell is made of an impermeable smooth film material, is sealed tightly on the inlet pipe and is adjacent to the inner the surface of the corrugations in which longitudinal hemispherical grooves are formed, and in the inner shell opposite the last corrugation there are made radial holes, Figure 2