SU1486695A1 - Throttle - Google Patents

Description

The invention relates to the field of valve and can be used in the field of engineering, nuclear energy, petrochemical and gas industry. The aim of the invention is to improve the efficiency of noise reduction by creating a cross-section of the channels of variable area. The working body through the central opening enters the channels 13. A change in the flow width between the projections 16 and the slots 15 causes the flow velocity to be different in different parts of the channel 13. 3 il.

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The invention relates to the valve and can be used in the field of engineering, nuclear energy, petrochemical and gas industry.

The aim of the invention is to improve the efficiency of noise reduction by creating a cross-section of the channels of variable area.

FIG. 1 shows a choke, a longitudinal section; in fig. 2 - section A — A in FIG. one; in fig. 3 - section B — B in FIG. one.

The choke includes a housing 1 with an inlet 2 and an outlet 3 with nozzles, a saddle 4 in which a sleeve 5 is installed on the outlet side of the working fluid, a throttling element including a perforated cup 6 with openings 7 around which the inserts 8 are located, forming a package of inserts. The glass 6 is tightly pressed to the sleeve 5 by a plate 9. Inside the glass 6 there is an axially movable rod 10. Each insert 8 is a set of annular sectors 11 fastened together with screws 12. Neighboring inserts 8 are shifted relative to each other by 90 °, m. e. shifted in checkerboard pattern. Between the ring sectors 11 channels 13 are formed for the passage of the working fluid.

The installation bolts 14 that pass through the threaded connections fix the specified positions of the inserts 8 mounted in the package. There are at least one groove 15 and two protrusions 16 on the radial forming annular sector 11. The greater the depth of the grooves (height of the projections), the wider the frequency range of muffled sounds must be . This value, however, cannot be excessively large, since the groove deepening can lead to the merging of the holes in the channels of adjacent inserts, and an increase in the height of the projections can significantly limit the total living section of the output channels of the package. For reasons of general symmetry of the grooves and projections of their uniform distribution in the radial forming annular sectors ^ζ was determined maximum value of the groove depth size marker

where b is the depth of the groove (the height of the protrusion);

K and g - outer and inner radii

end forming annular sectors;

η is the number of projections on one radial end of the ring sector;

N is the number of ring sectors in one insert.

To avoid the generation of noise due to bending vibrations of protrusions on the basis of experimental studies, the following ratio of protrusion width and groove width was chosen.

where a is the width of the protrusion;

B is the groove width;

η is the number of protrusions on one radial end of the ring sector.

The device works as follows. The working fluid through the inlet 2 enters the saddle 4. With a sufficient degree of lift regulating the flow of the rod 10, the working medium through the hole 7 of the perforated glass 6 passes into the channels 13 formed by ring sectors 11 and exits through the outlet 3. Due to the change in the width of the flow between the projections 16 and the grooves 15, the flow rate in different parts of the channel 13 is not the same, which leads to an increase in noise reduction efficiency.

Claims (1)

Claim A choke, in the case of which a rod and a throttling element are placed, including a perforated cup and a package of inserts, characterized in that, in order to improve noise reduction, the inserts are made in the form of ring sectors with grooves and projections on the radial generators, the sectors are placed to form channels them, and the inserts in the package are staggered. 1486695 AND; 1486695 6-B φΐ / £> 3