Control valve for steam turbine

FIELD: power engineering.

SUBSTANCE: control valve has steam box with a lid.

EFFECT: enhanced reliability.

3 dwg

 

The invention relates to control devices propuskom steam turbines, and its object is the control valve.

The main elements of the control valve are steam box, a rod passing through the guide buxu fixed in the lid of the steam box, and the Cup valve associated with the piston rod to control its position relative to the valve seat. In addition, the valve may include a fixed guide glass skirts bowl valve and an unloading device, representing the auxiliary valve pair in the form of a saddle in the bottom of the bowl valve and interacts with the locking lug on the end of the rod, if the counterbalance valve type.

To ensure repair of control valves, associated mainly with the destruction of the rod, the connection of the bowl with the valve stem implement split, with most of the known control valves - threaded using auxiliary locking means, such as pins, threaded pins or spot welding, USSR author's certificate No. 1373839, F 01 D 17/10, 1988, (1). In conditions of high temperature steam threaded connections intensively corrosivus and zakladivaetsa that makes it impossible to disassemble without the use of cutting equipment, which, as a rule, does not allow execute the ΓΌ recovery of stem and bowl of the valve and requires replacement. This significantly limits the possibility of conducting routine inspections of the control valves, increases the complexity and cost of their repairs.

Known control valve, which is the closest analogue of the present invention, in which the connection of the bowl with the valve stem is made without the use of threaded connections. In this known valve, containing fixed in the steam box guide buxu passing through it by the stem and developed part of the pan - glass placed in him by his skirt bowl valve skirt bowl with ring clamp, through which passes the stem, and the stem is made with a radial projections on its tip, and the annular collar of the bowl is congruent with these projections slits formed with the protrusions of the rotary shaft has an axial connection for fixing the end of the pan is provided with longitudinal projections passing through the slots in the annular collar of the bowl and between the radial projections on the rod, RF patent β„–2053372, F 01 D 17/14, 1996, (2).

Control valve with such a connection of the stem and the bowl valve has better maintainability compared to the others.

However, in this known valve longitudinal protrusions, the locking swing-axial connection to prevent twisting of the bowl and transfer of these impacts on the stock, made in the form of longitudinal high the UPOV at the end of the axle box, and this, in the case of damage to these projections in the process of carrying out installation work, it was noted that in practice, leads to the necessity of dismantling and replacing the guide axle box, a very expensive part, this repair has a high complexity.

The present invention is the task of creating such a control valve, in which the connection of the stem with the bowl valve has high maintainability, but in which, however, fixing this connection would be made with the help of such tools, which improve maintainability, did not reduce the strength characteristics of the main elements of the valve.

This problem is solved in a control valve of a steam turbine, which contains fixed in a steam box with lid guide buxu passing through it, a rod, a glass pan with placed him in her skirt, the bowl valve is made with an annular collar forming with the pass-through shaft rotary-axial connection, and in which, in accordance with the essence of the present invention, the sleeve is fixed in a glass pan, made of longitudinal protrusions special configuration, passing through the slots between the tabs at the collar of the skirt and on the stem tip, the distance from the ends of the projections to lock in what any surface of the bowl exceed the AET value possible geometrical movements of the bowl valve between its lower and upper stops.

In such embodiment, by performing longitudinal protrusions for fixing the rotary axial connection of the bowl with the valve stem on a separate sleeve, eliminating the above drawback of the nearest analogue, while maintaining all the advantages applied it swivel-axial connection of the bowl with the valve stem.

The fastening sleeve with longitudinal ridges in the glass may be accomplished by any known ways, such as by press fit or other looser fit using clamping elements type pins, round pins, etc. to provide the best manufacturability and maintainability.

In addition, due to the fact that in the invention the guide Bush is not responsible longitudinal protrusions for fixing the rotary axial connection of the bowl with the valve stem, this PTC site and guide the glass bowl of the valve can be made in a single piece, which will improve the manufacturability and ensuring alignment movement of the stem and bowl of the valve.

The essence of the present invention is illustrated in the following further detailed description of one example of implementation depicted in the attached drawings, on which:

figure 1 depicts a control valve of a steam turbine according to the invention in longitudinal section (along a-a in figure 2) at the position the bowl on the lower stop is; figure 2 - valve in cross section along B-B in figure 1; figure 3 is a valve at the position the bowl on the top limit.

The control valve shown in the drawings, comprises a steam box 1, the cover 2 which is fixed Buchs 3 and made in one piece with the Cup 4. Buchs 3 serves as a guide for the passing through it of the rod 5, and a glass 4 - guide to bowl 6 that interacts with the seat 7 of the valve and moving at a bowl of her skirt 8 on the inner surface of the Cup 4. In the bowl 6 is made saddle 9 auxiliary relief valve, shut-off body which is the tip 10 of the rod 5 with a spherical surface.

To ensure lifting of the bowl 6 of her skirt 8 is made with an annular collar 11, and the tip 10 of the rod 5 with radial projections 12. In the annular collar 11 is made of radial slots 13, congruent projections 12 of the rod, but with a slightly larger area to ensure that when the Assembly is free passage through them of the projections of the rod. Radial protrusions 12 of the rod, and a radial slot 13 is made of the same step on the circle, and the radial length of the projections 12 on the rod should be such that between these projections and the annular collar 11 has a distance sufficient to free movement of the rod 5 relative to the bowl 6 by the amount necessary for the functioning of the formed rotary axis of the first connection Assembly and disassembly and to provide auxiliary opening the discharge valve.

In the Cup 4 by dense planting replaceable sleeve 14, the lower end of which is located above the annular collar 11 of the skirt 8 of the bowl valve 6 by an amount sufficient to make the stroke of the bowl 6 at full valve opening. To prevent possible reversals of the sleeve 14 and its position is fixed in the Cup 4 pin 15. The bottom end of the sleeve 14 is a longitudinal protrusions 16, congruent radial grooves between the projections 12 of the rod and arranged with the same pitch around the circumference, as the protrusions 12 of the rod, and a radial slot 13 of the annular collar 11 of the bowl valve. The protrusions 16 can be of any shape, but most technologically advanced they are in the manufacture of the blanks in the form of a sleeve, in which is cut the metal from the designated slots. The cross section of the protrusions 16 take the form of brackets, figure 2. These protrusions 16 of the sleeve 14, passing through the radial slots 13 and between the projections 12 of rod function as a locking device for rotary and axial connection formed by the slits 13 and the protrusions 12.

The described valve works in the same way as other known valves of this type. When disassembling described valve after dismantling the valve cover 2 of the box 1 rod 5 together with the bowl 6 is removed from engagement with the longitudinal protrusions 16, unwrap the bowl 6 to align its slots 13 with the protrusions 12 of the rod is sever it with the bowl 6.

The sources of information cited in the description

1. Auth. St. USSR β„–1373834, F 01 D 17/10, 1988

2. RF patent β„–2053372, F 01 D 17/14, 1996

The control valve of a steam turbine, containing steam box with a lid, which is equipped with guide Bush guide Cup and passing through it a rod placed in a glass skirt bowls valve with the annular collar made with radial slots, and the stem is made of radial tabs, located on the possibility of formation of slotted annular collar bowls turning-axial connections, and the locking device in the form of longitudinal projections to prevent relative spreads of the stem and bowl of the valve when the valve, characterized in that the glass installed and fixed pin sleeve and it made mentioned longitudinal tabs between the radial slots of the annular collar of the bowl valve and projections of stock in all the movements of the stem and the bowl, the lower end of the sleeve is located above the annular collar of the skirt of the Cup of the valve by an amount sufficient to make the stroke of the bowl at full valve opening.



 

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FIELD: power engineering.

SUBSTANCE: control valve has steam box with a lid.

EFFECT: enhanced reliability.

3 dwg

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