CN201225170Y

CN201225170Y - Steam turbine main air valve adjusting integral valve dish

Info

Publication number: CN201225170Y
Application number: CNU2008201502452U
Authority: CN
Inventors: 沈国平; 徐嗣华
Original assignee: Shanghai Electric Power Generation Equipment Co Ltd
Current assignee: Shanghai Electric Power Generation Equipment Co Ltd
Priority date: 2008-06-30
Filing date: 2008-06-30
Publication date: 2009-04-22
Anticipated expiration: 2018-06-30

Abstract

The utility model relates to a conditioning valve disc of a steam turbine, in particular to a conditioning valve disc of a throttle valve of a steam turbine. The conditioning whole valve disc of the throttle valve of the steam turbine comprises a valve rod and a valve disc which are positioned in a bushing inside a conditioning valve cover of the throttle valve and are combined into a whole body; and head parts of the valve disc and the valve rod are of interiorly-hollow structures. The utility model has the advantages that the vibration of the throttle valve during the operation and the noise can be reduced, and the security of the conditioning valve operation can be improved; in addition, the utility model has no high requirements for processing and assembling, is low in cost and easy to realize.

Description

The whole valve disc of steam turbine throttle pitch

Technical field

The utility model relates to a kind of pitch valve disc of steam turbine, relates in particular to a kind of steam turbine throttle pitch valve disc.

Background technique

The steam turbine that present domestic conventional 300MW grade is above, the valve disc of throttle pitch and valve rod are part independently separately, pitch moves valve disc by the power of valve rod transmission oil engine, thus the aperture of control valve.Referring to Fig. 1, valve disc 4 is installed in valve rod 1 one ends and is loose fit through first sleeve 5, and valve rod 1 is a two end supports, and wherein the strong point at close valve disc place is at valve gap 2 places, and two strong points have enough distances, have preferably to neutrality.But this valve disc 4 and valve rod 1 are independent separately and be the throttle pitch of loose fit, the center of gravity of valve disc 4 be higher than the strong point of valve rod 1 and supporting surface length that valve disc 4 cooperates with valve rod 1 shorter, valve disc 4 is easy to generate inclination during operation, makes the gap between valve disc 4 and the sleeve 3 circumferentially inhomogeneous.Steam flow can produce the excitation force of certain frequency when flowing through circumferential inhomogeneous gap, be subjected to the effect of exciting power, and valve disc 4 comprises the moving element generation forced vibration that is attached thereto with valve rod 1.If the steam flow excitation frequency just in time with these parts in natural frequency when coupling of some part, serious resonance will take place, produces huge noise, even generation valve rod 1 fracture accident, have a strong impact on the safe operation of pitch.Therefore there is following drawback in existing throttle pitch valve disc: regular meeting is vibrated when valve disc of (1) pitch and valve rod and other linkage parts, produces noise.When (2) valve disc of pitch and valve rod and other vibration member produce resonance, may cause valve stem crack, cause production accident.

The model utility content

The purpose of this utility model is to provide a kind of steam turbine throttle pitch whole valve disc, and this integral body valve disc can be avoided the vibration of pitch valve rod and valve disc, reduces noise, improves the Security of pitch operation.

The utility model is achieved in that the whole valve disc of a kind of steam turbine throttle pitch, comprise valve rod and valve disc, valve rod and valve disc are positioned at throttle pitch valve gap sleeve inside, and valve disc and valve rod are as a whole, and the head of valve disc valve rod is the inner hollow structure.

The utility model is designed to overall structure with valve disc and valve rod, has reduced by an annexation, has both kept the original kinetic characteristic of valve disc, has improved the centering performance of valve disc again.The utility model compared with prior art has following beneficial effect: can prevent that valve disc from producing, the vibration when reducing the throttle operation, reduce noise, improve the Security of pitch operation, and the utility model is less demanding to processing and assembling, with low cost, be easy to realize.

Description of drawings

Fig. 1 is existing throttle pitch valve rod and valve disc structural representation;

Fig. 2 is the utility model throttle pitch valve rod valve disc structural representation.

Among the figure: 1 valve rod, 2 valve gaps, 3 sleeves, 4 valve discs, 5 first sleeves, 6 valve seats; 7 whole valve discs, 8 valve rods, 9 valve discs.

Embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Referring to Fig. 2, the whole valve disc 7 of a kind of steam turbine throttle pitch comprises valve rod 8 and valve disc 9, and valve rod 8 and valve disc 9 are positioned at throttle pitch valve gap 2 sleeve inside 3, valve disc 9 and valve rod 8 are as a whole, and the head of whole valve disc 7 valve rods 8 is the inner hollow structure.

The molded lines of whole valve disc 7 valve rods 8 inner hollow structures is to calculate by flow field analysis, can reduce the influence of the little aperture of valve position steam flow power to whole valve disc 7 valve rods 8 effectively, thereby reduce the vibration of main inlet throttle-stop valve, reduces noise, improves the valve Security.

In the whole valve disc 7 of throttle pitch of the present utility model, valve disc 9 valve rods 8 are overall structures, valve disc 9 and valve rod 8 move together, can prevent valve disc 9 from producing and and produce circumferential inhomogeneous gap between the sleeve 3, thereby steam flow by the time produce and to cause the excitation force that vibrates, can avoid vibrating the noise of generation and the production accident that resonance may cause.

Claims

1, the whole valve disc of a kind of steam turbine throttle pitch comprises valve rod and valve disc, and valve rod and valve disc are positioned at throttle pitch valve gap sleeve inside, and it is characterized in that: valve disc and valve rod are as a whole, and the head of valve disc valve rod is the inner hollow structure.