SU558692A1 - Steam valve strainer - Google Patents

Description

(54) STEAM VALVE SITO

one

This invention relates to turbomachines (a structure and can be used in practical turbines to clean steam from mechanical impurities,

In steam turbines, sieves are used to clean the steam (filters) installed in the valve boxes mainly of stop valves and used to clean the steam from mechanical impurities (for example, pieces of electrodes left after welding of pipelines) that, if released into the flow part of the turbine, can damage it. In most cases, the sieve is a sheet cylinder with a large number of holes of small diameter. To increase the mechanical strength, the screen is sometimes placed on a cylindrical frame.

W.

However, the steam passing from the valve inlet to the diffuser through such a sieve makes a sharp turn of 90, and the steam passing through the top of the sieve flows around the non-operational part of the valve pear, which creates turbulence in the steam flow, which leads to an increase in the hydraulic steam flow. which increase the hydraulic resistance of the valve and the loss of vapor pressure.

It is also known steam valve sieve containing plates placed in front of the outlet diffuser in the annular frame, forming between themselves flow channels inclined to the vertical axis along the direction of &

LENIO to the diffuser at a constant 2b angle along the Bbh screen.

However, a portion of the steam wraps around the non-operating portion of the valve pear, and the steam flowing in the lower part of the sieve forms a stagnant zone (since this steam does not fall directly into the diffuser), which also leads to a loss of vapor pressure.

Such a steam sieve of the valve is as close as possible to the proposed essence.

The aim of the invention is to reduce the hydraulic resistance of the valve)

This is achieved by the fact that the flow channels formed by the plates, installed in front of the outlet diffuser in the ring frame, are made with a naklop angle; . 1 height in direction 1; t vt diffuser. The 11 forming sieves can be upright and made with rebers that bind the channels to high :: e. It is possible that the passage channels are made in the form of flat diffusers, which leads to a decrease in the hydraulic resistance of the sieve due to the restoration of steam in a flat diffuser. FIG. 1 shows a schematic of a sieve of a valve with flat plates inclined to the horizontal; in fig. 2 is the same section of FIG. one; in fig. 3 - view on page B; in fig. 4 - valve sieve with vertically mounted plates; Fig, 5 is a section bE. FIG. four; Fig 6 is a view along arrow G; Fig, 7 - a passage in the form of a flat diffuser. The steam sieve consists of packages 1 containing plates 2, having the form of ionic sectors and placed one after another in a checkerboard pattern. Plates 2 are inclined to the axis of the sieve, and the angle of inclination cL of the plates 2 is different for each of the packages 1. In the package installed in the lower part of the sieve, the plates 2 are arranged horizontally, i.e. perpendicular to the axis of the sieve, and in each of the subsequent packages 1 installed above, the angle of inclination of the plates 2 is less than the slope oL of the previous part of the previous package 1. Between the packages 1 and the top and bottom of the sieve, there are three. fixed with stitches 4 and from fastener 5. A sieve is placed in a valve, for example, a stopper, consisting of a valve box 6, hinge 7, a diffuser 8 and the valve 9 itself with a pear 10. In the second embodiment (see FIG. 4) the sieve formed by vertically mounted, tightly pressed one to another plates 11, fixed in the upper 12 m and the bottom 13 of the colds: with For the formation of through channels on the plates 11, the ribs 14 are made. The diffuser 8 has E. aperture 15. The through channels, tz1 sieves can be made in the form of 1SCH diffusers formed by the plates 11 of the corresponding profile (see Fig. 7) In all cases, the inclination angle of the channels decreases in height in the direction / direction of the diffuser 8. With full OTKp). Kj; i: ia: Ui) the diffuser 8 enters the inlet from the inlet nozzle. The passage through the sieve, the steam enters the flow channels that are either narrow horizontal slits formed by the plates 2 (phg. 1. 2. 3) or the curved slits formed by plates 11 with ribs 14 or horizontal diffusers, and is cleaned of mechanical impurities. Since the angle of the grooves of the through-channels decreases in height along the direction from the diffuser, the barge, passage through the sitorus is guided under the bulb 10 of valve 9 into the diffuser 8 without flowing around the non-working part of the pear 10. The proposed sieve allows reducing the hydraulic resistance, which reduces the loss of vapor pressure in valve box, for example; steam turbine stop valve. Reducing the pressure loss of the valve improves the efficiency of the turbine. Besides; reducing the hydraulic resistance of the sieve will increase the speed in the valve box and reduce its dimensions, i.e. metal intensity of the turbine. Form m 1, a) apO;.; Oe sitz to: cha;: /; :: a dream simulator of a steam turbine .-. containing plates placed in front of the exit diffuser in the annular frame, forming between themselves flow channels inclined to the vertical axis towards the diffuser, which are made with TeMj with the aim of reducing the hydraulic resistance decreasing in height from the diffuser. 2 "Sieve according to claim" 1, tl and ch and s s with the fact that the plates are installed vertically and made with ribs, limiting channels in height, 3, Scto on clause, 1, This is due to the fact that the channels are installed in the form of flat diffusers. Sources of information received in BHW–;: s during examination: 1. Turbo and compressor engineering ed., V. A Eliseeva, L., Mashinostroenie, 1970, with. 303. 2. US patent N9 2569413, .cl. 210 492, 1951.

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