Fluid handling – With casing – support – protector or static constructional... – Jacketed
Patent
1994-01-25
1996-02-06
Chambers, A. Michael
Fluid handling
With casing, support, protector or static constructional...
Jacketed
251298, 251356, F16L 700
Patent
active
054889715
DESCRIPTION:
BRIEF SUMMARY
This invention relates to improvements in or relating to blades for isolators, i.e. isolating valves, especially diverter and flap isolators. The invention is particularly concerned with the flap and blade construction (hereinafter referred to as the blade) of large such isolators.
BACKGROUND OF THE INVENTION
One of the main problems in the design of isolator blades is to provide a structure that can resist the applied loadings due to gas pressure, weight and seal loading, and will also not distort under start-up/shut down temperature transients as well as steady state elevated temperature operating conditions.
In the usual construction the blade assembly consists of a blade arm frame with individual blades attached to it, one for flap isolators, two for diverter valves, the attachment being carried out in such a way that differential movements are possible between the blades and blade arm frame.
A known blade structure is shown in FIG. 1 of the accompanying drawings, which is an exploded isometric view of a known type of blade structure of a diverter isolator, and which shows a blade arm frame 1, to one side of which is attached a boiler inlet blade 2 to which is in turn attached an insulation 3 and an insulation cladding 4. To the other side of the blade arm frame 1 is attached a bypass blade 5 to which is in turn attached another insulation 6 and an insulation cladding 7. The blade arm frame 1 itself has a central fixing 8 for the blades and blade location guides 9.
The operating shaft comprises a connecting shaft 10 and, at each end thereof, a stub shaft 11 having a keyed and bolted flange connection 12, a shaft seal 13, a high temperature shaft bearing 14, a coupling 15, and an actuator 16. The actuator 16 has a motor 17, a reduction gear box 18 and bevel gearing 19. There is also a hand wheel 20. It may be noted that the drive motor assembly can be mounted centrally or inboard of actuators over duct as site conditions allow.
Details of the blade structure shown in FIG. 1 are illustrated in FIGS. 2a-2d of the drawings, wherein FIG. 2a is a perspective view of the assembled blade structure, and FIGS. 2b, 2c and 2d are detailed perspective views showing the areas indicated A, B and C respectively in FIG. 2a. Specifically FIG. 2b shows a clamp arrangement between the various parts of the blade structure, and in particular illustrates the insulation infill 3 and 6, FIG. 2c shows the centre location pin structure, and FIG. 2d shows the guide key structure.
The disadvantage of this type of structure is that overall blade weight is high, leading to high operating torques.
BRIEF DESCRIPTION OF THE INVENTION
The present invention relates particularly to diverter and flap isolators for high temperature applications.
The present invention provides a blade for an isolator, in particular for a diverter or flap isolator, which comprises a plurality of plate arms to be attached to an isolator shaft, and a pair of plates (preferably comprising an array of panels) attached to the plate arms and separated by a gas space, which plates are suitably provided with insulation retained by cladding, preferably in the form of cladding panels.
The blade plates are of such a width as to fit between the plate arms. They will be made in as long lengths as possible and only joined (by welding) where necessary.
The blade plates, which will be thin plates, will usually be provided with convolutions of some sort to given them improved stiffness. The blade plates will furthermore be welded or otherwise secured together by means such as a series of short tubes extending therebetween.
The present invention thus provides a one-piece blade which has the effect of reducing the operating torque. A main feature of the design is that all main parts of the blades are wetted by the hot gas at all times.
The blade according to the invention comprises a number of plate arms, the actual number depending upon the operation conditions and size. At the shaft end these are suitably stiffened to increase the section modulus as required. Between ea
REFERENCES:
patent: 4351361 (1982-09-01), Worley
patent: 4821507 (1989-04-01), Bachmann et al.
patent: 4919169 (1990-04-01), Bachmann et al.
patent: 5120021 (1992-06-01), Squirrell et al.
patent: 5159954 (1992-11-01), Janich
Squirrell Anton F.
Waldron John
Chambers A. Michael
Holler Norbert P.
WES Technology Inc.
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