US3848665A - Damper slide for hot blast slide dampers - Google Patents

Abstract

A slide for hot blast slide dampers having a pair of spiral volutes arranged in the shape of a flat disc having an inlet connection and an outlet connection for a coolant at the edge thereof. One of the spiral volutes leads the coolant from the inlet connection to the center of the disc and into the other spiral volute whereby the coolant is lead from the center of the disc to the outlet connection. The volutes are separated from each other by walls extending transverse to the major plane of the disc to form a cooling channel. The volutes are separated by a single common wall extending substantially perpendicular to the major plane of the disc and the cross section of the cooling channel may be substantially quadrangular. The volutes are made from spirally interwound open sections welded together.

Description

Uerlichs et a DAMPERS Assignee:

Filed:

DAMPER SLIDE FOR HOT BLAST SLIDE Inventors: Johannes Uerlichs, Woffelsbach;

Rudolf Muller, Merzenich; Wilhelm Kuckertz, Konzendorf, all of Germany Hermann Rappold & C0. GmbI-I,

Duren, Germany May 9, 1972 App]. No; 251,709

Foreign Application Priority Data May 17, 1971 Germany 2124303 References Cited UNITED STATES PATENTS 3,499,462 3/1970 Berczynski 137/340 3,557,823 1/1971 Carr et a1 137/340 FOREIGN PATENTS OR APPLICATIONS 212,607 8/1909 Germany 165/169 Primary Examiner-Albert W, Davis, Jr. Assistant ExaminerS, J. Richter Attorney, Agent, or FirmWenderoth, Lind & Ponack [57] ABSTRACT A slide for hot blast slide dampers having a pair of spiral volutes arranged in the shape of a flat disc having an inlet connection and an outlet connection for a coolant at the edge thereof. One of the spiral volutes leads the coolant from the inlet connection to the center of the disc and into the other spiral volute whereby the coolant is lead from the center of the disc to the outlet connection. The volutes are separated from each other by walls extending transverse to the major plane of the disc to form a cooling channel. The volutes are separated by a single common wall extending substantially perpendicular to the major plane of the disc and the cross section of the cooling channel may be substantially quadrangular. The volutes are made from spirally interwound open sections welded together.

2 Claims, 4 Drawing Figures DAMPER SLIDE FOR HOT BLAST SLIDE DAMPERS BACKGROUND OF THE INVENTION This invention relates to a slide for hot blast slide dampers composed of volutes of spirally interwound sections forming a flat disc peripherally embraced by a ring which projects from the side faces of the disc, and which is provided with'entry and outlet connections for a coolant conducted through the channels formed by the volutes to the center of the disc and then back 1 again.

For the purpose of satisfactorily conducting the coolant through the slides of hotblast slide dampers so that occlusions of air and the deposition of sludge is avoided, it has been proposed in German Pat. Specification No. 1,031,329 to form the cooling channels This is a form of construction which provides excellent cooling effects with a minimum volume of coolant. However, structurally the arrangement is not yet adequate, without considerable additional reinforcement, to withstand the static loads that arise when the damper is closed at the hot blastpressures that are now conventional.

Additional reinforcement involves additional expense and an increase in the thickness of the damper slide and this in turn adversely affects the overall dimensions of the damper casing. These drawbacks are even more pronounced in the case of hot blast slide dampers in which the slides are faced with refractory material to protect the metallic parts from the effects of direct thermal radiation.

SUMMARY OF THE INVENTION It is an object of the present invention with the aid of simple structural devices to improve the resistance of the damper slide to static loads. According to the present invention in a slide for hot blast slide dampers, which affords a cooling channel in the form of a pair of spiral volutes arranged in the shape of a flat disc, one of the spiral volutes leading coolant from an inlet connection at the edge of the disc to the center of the disc and into the other of the spiral volutes, by which the coolant is then lead from the center of the disc to an outlet connection at the edge of the disc, the volutes are separated from each other by walls extending transverse to the major plane of the disc. The volutes are preferably separated by a single common wall extending substantially perpendicular to the major plane of the disc. The crosssection of the cooling channel is thus preferably substantially square or rectangular. The structure may be manufactured in any desired manner but we have found that a method involving welding open channel section material is preferable. Thus the volutes are preferably made from spirally interwound open sections welded together.

If the sections are suitably chosen the slide will be able to stand up to the loads which are imposed by the hot blast pressures and hot blast temperatures that are now conventional, without the need of additional stiffening means. The section moduli of channel sections far exceed those of hollow section spirals of similar weight, bearing in mind that the flanges of channel sections can be made thicker and at the same time the webs made thinner, since in the contemplated application the latter contributes little to the strength of the structure. A slide according to the invention of the same stability and load-bearing ability as a conventional slide can be substantially thinner than the latter, a circumstance which has a favorable effect on the overall length of the slide damper assembly. At the same time the advantages achieved by using hollow sections, such as simplicity of production, high water velocities and small water volumes, good self cleaning effect and the avoidance of water leakage from the high pressure spiral conducting the water inwards into the lower pressure spiral conducting the water outwards, are all fully preserved. Despite a reduced expenditure in structural means the invention provides an efficient damper slide which satisfies the technical and service requirements.

If the spiral volutes used for the construction of the proposed slide are wound from a section offering considerable resistance to being bent to the required shape it is preferable to form the center of the spiral volutes from a special core piece whichcontinues the cooling channelsformed by the sections. This considerably facilitates the production of the slide.

For winding the spiral volutes conventional rolled steel sections forming a channel on one or both sides may be used. Particularly suitable are I-sections which have been very successful in practice.

BRIEF DESCRIPTION OF THE-DRAWINGS With the above and other objects in view which will become apparent, one specific embodiment of the damper slide in accordance with the present invention will be shown by way of example with reference to the accompanying drawings in which:

FIG. 1 is a plan view of one face of a damper slide, a part of the center as well as a portion including the inlet and outlet connections for the coolant being in section,

FIG. 2 is a part sectional side view of the slide according to FIG. 1,

FIG. 3 is a cross section on a larger scale of the core piece of the damper slide, and

FIG. 4 is a fragmentary cross section of the slide, likewise on a larger scale.

DETAILED DESCRIPTION OF THE INVENTION Referring to the drawings, 1 and 2 are two flat spiral volutes consisting of steel I-section channel members, the convolutions being radially spaced by the overall width b of the I-section flanges.

The two volutes l and 2 are interwound and their flange edges, which are bevelled for the formation of weld seams, are welded together to provide a spiral pitch b.

This form of construction defines convolutedcooling channels 5 and 6 between thewebs 3 and 4 of consecutive convolutions of the two spiral volutes, the two channels being connected in the center of the slide. Onechannel 5 serves for conducting the coolant to the slide center, whereas theother channel 6 conducts it back again to the outside.

For establishing communication between thechannels 5 and 6 in the center of the slide a core piece 7 is provided which contains deflecting means 8 and 9 forming continuations of thewebs 3 and 4 of the spirally interwoundmembers 1 and 2 which are connected to the core piece 7 at 10 and 11. V

The circumference of the slide is embraced by ahollow ring 12 provided with sealing faces at 13 and 14 which cooperate with corresponding sealing faces in the damper casing when the slide damper is closed. On its outer periphery thehollow ring 12 is provided with anentry connection 15 and anoutlet connection 16 for the coolant and it forms the intermediate member between theconnections 15 and 16 and thevolutes 1 and 2, thewebs 3 and 4 of the sections merging at 17 and 18 into the inner circumferential wall of thehollow ring 12.

As will be understood, more particularly by reference to FIG. 2, the width of thehollow ring 12 exceeds the width of the sections forming thevolutes 1 and 2 so thatpan-shaped recesses 19 and 20 which remain on each face of the slide can be filled with a refractory material.

said pair of channel members being spirally interwound with the edges of the flanges of one of said members sealingly connected to the edges of the flanges of the other of said members;

said spirally interwound members forming a flat disc;

said connected and spirally interwound members forming therebetween a pair of spaced convoluted cooling channels, said channels being separated by said webs of said members;

said channels being connected at the center of said flat disc;

a first of said channels, at the periphery of said disc, having an inlet connection for communication with a source of cooling fluid;

a second of said channels, at the periphery of said disc, having an outlet connection for discharging said cooling fluid;

whereby cooling fluid flows into said first channel from said inlet connection, through said first channel to said center of said disc and into said second channel, and through said second channel to said outlet connection; and

a core member positioned at said center of said disc, said core member having deflecting means forming continuations of said webs of said members.

2. A slide as claimed inclaim 1, further comprising a hollow ring surrounding the periphery of said disc, said hollow ring having sealing surfaces for engagement with corresponding surfaces of said casing of said slide damper.

Claims (2)

1. A slide for use in a hot blast slide damper having a casing, said slide comprising: a pair of channel members, each having an I-shape cross-section with opposite flanges joined by a web; said pair of channel members being spirally interwound with the edges of the flanges of one of said members sealingly connected to the edges of the flanges of the other of said members; said spirally interwound members forming a flat disc; said connected and spirally interwound members forming therebetween a pair of spaced convoluted cooling channels, said channels being separated by said webs of said members; said channels being connected at the center of said flat disc; a first of said channels, at the periphery of said disc, having an inlet connection for communication with a source of cooling fluid; a second of said channels, at the periphery of said disc, having an outlet connection for discharging said cooling fluid; whereby cooling fluid flows into said first channel from said inlet connection, through said first channel to said center of said disc and into said second channel, and through said second channel to said outlet connection; and a core member positioned at said center of said disc, said core member having deflecting means forming continuations of said webs of said members.

2. A slide as claimed in claim 1, further comprising a hollow ring surrounding the periphery of said disc, said hollow ring having sealing surfaces for engagement with corresponding surfaces of said casing of said slide damper.

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