US2866517A - Discharge electrode mounting device - Google Patents

Description

Dec. 30, 1958 .1. PHYL DISCHARGE ELECTRODE MOUNTING DEVICE 3 Sheets-Sheet 1 Filed Nov. 26, 1956 INVENTOR JOSEPH PHYL Dec. 30, 1958 J. PHYL DISCHARGE ELECTRODE MOUNTING DEVICE s Sheets-Sheet 2 Filed Nov. 26, 1956 INVENTOR JOSEPH PHYL ATTORNEY Dec. 30, 1958 J. PHYL 2,866,517

DISCHARGE ELECTRODE MOUNTING DEVICE Filed NOV. 26, 1956 3 Sheets-Sheet 3 INVENTOR JOSEPH PHYL ATTORNEY States Patent DISCHARGE ELECTRUDE MOUNTING DEVICE Application November 26, 1956, Serial No. 624,412

' l 6 Claims. ((31.183-7) The present invention relates generally to electrical precipitators, and specifically to new and useful improvements in the mounting structures for discharge electrodes employed in electrostatic precipitators.

In typical electrical precipitator constructions a plurality of high tension discharge electrode wires are normally mounted vertically in fixed patterns relative to complementary, vertically disposed collecting electrode plates. It is conventional, in such precipitators, to support the discharge electrodes by suspending them from their upper ends and coupling their lower ends to tensionmg weights or frames.

In electrical precipitator operation dust and other precipitate collects on the discharge electrodes and is removed, for the purpose of maintaining precipitator efficiencies, by vibrating or rapping means which cause flexing and vibration of the electrodes.

One form of discharge electrodes take the form of elongated flat ribbons or bands of a conductive material and it has been discovered that flexing and vibration of such ribbon type electrodes produces substantial stresses which are normally concentrated along the edges of the ribbon or band. Great difiiculties have been experienced in precipitator construction employing ribbon type electrodes in preventing rupture and breakage of these bands by stresses established through vibration and flexing induced by cleaning apparatus. It has been additionally discovered that breakage and failure of ribbon type electrodes has for the most part been concentrated in the immediate vicinity of the upper and lower points of support of the electrodes where the supporting elements are coupled to the electrode.

It is therefore a general object of the present invention to provide new and useful supporting structures for ribbon type electrodes utilized in electrical precipitators which effectively and efficiently support the electrodes under vertical tension within the precipitator apparatus yet which avoid and eliminate the establishment of stress concentration in the electrode thereby reducing fatigue at the points of support resulting in a substantial reduction in electrode failure and breakage.

It is a principal object of the present invention to provide an improved structure for mounting and supporting discharge electrodes in precipitator apparatus which substantially eliminates concentration of stress fatigue in the electrode due to rapping vibration.

Another object of this invention resides in the provision of new and unique mounting and supporting structures for discharge electrodes in precipitator apparatus which provides for the positive tensional support of a ribbon type electrode in such a manner as to prevent concentration of stress at the points of support.

Still a further object of this invention is to provide novel and useful structures for supporting ribbon type electrodes within precipitator apparatus through the use of which the electrodes may be quickly and easily in- 2,866,517 Patented Dec. 30, 1958 stalled, removed and replaced with a minimum requirement of time and labor.

It is another object of this invention to provide ribbon type electrode support structures of the type described which will effectively support and retain electrodes within precipitator apparatus in such a manner that the rapping efficiencies are maintained at their maximum and whereby the electrodes are maintained under tension at all times. l

Still a further object of this invention lies in the provision of new and useful mounting'and support structures for discharge electrodes which are of extremely simple and inexpensive design and manufacture and which Will afford a durable and long lasting construction.

Still other objects and advantages of this invention will become more readily apparent to those skilled in the art when the following description and disclosures are read in the light of the accompanying drawings.

The nature of the present invention may be stated in general terms as relating to mounting and supporting structures for ribbon type electrodes in electrical precipitators including in combination with a supporting frame, spacer means of lesser transverse width than that of the electrode, and clamping means supported from said frame and engaging said spacer means and the electrode.

Referring to the accompanying drawings in which like references designate similar parts throughout the several v1ews:

Fig. 1 is a sectional elevation through a precipitator embodying electrode mounting structures constituting the present invention;

Fig. 2 is an enlarged front elevation of one electrode including its supporting structure;

.3 is a side elevation of the structure disclosed in Fig. 4 is an exploded view of the components of the electrode supporting structure shown in Figs. 2 and 3;

Fig.5 is a view similar to Fig. 2 of a modified formof the invention; a t

6 is a side elevation of the structure disclosed in t Fig. 7 is an exploded view of the top ture disclosed in Figs. 5 and 6; and

Fig. 8 is a pictorial view of one of the clamping memgersdog the bottom mounting structure disclosed in Figs.

Referring to Fig. 1 of the drawings there is shown a typical electrical precipitator construction, generally designated at 10, which includes a housing or shell 12 having a hopper type bottom 14, a gas inlet 16 and a remotely spaced gas outlet 18. A plurality of collecting plate electrodes 20 is supported within the shell intermediate the gas inlet and outlet by top and bottom supportmg frames 22 and 24 respectively. The collecting plate electrodes 20 are arranged in parallel spaced relationship mounting strucand in usual manner plural rows of discharge electrodes 26 are suspended vertically within the shell from a high tension frame 28 supported from an insulator 30 mounted in the'upper end of the shell. Each row of spaced discharge electrodes is arranged in parallel spaced relationship between adjacent collecting plate electrodes to establish typical electrostatic fields for theseparation of (lllllSt particles and the like from gas passed through said s ell. t

In the precipitator structure disclosed electrically ,operated rapper members 32 having insulating rapper rods 32a are supported in the upper regions of the shell for striking and vibrating the high tension frame 28 which in turn transmits the vibration to the discharge electrodes causing rapid flexing or vibration of these electrodes for the removal of precipitated materials therefrom.

IHFigS; 2 through 4 of thedrawings, thereis-disclosed one embodiment of the electrode mounting means constituting the present invention by which structure the dis- "char-ge electrodes 26are suspended under vertical tension from the supporting frame 28 within the precipitator shell. The discharge electrodeg26 is shown in the form of an elongated ribborrtype electrode of a type commonly known in the precipitator art.

In this embodiment of the invention the strip or ribbon electrode is provided ateach end thereof with an integrally =formed short loop'34. Associated with each looped end of the electrode is a stiffening or spacer member 36 which is of: substantially hairpin-like configuration having a pair of-elongated flat coextensive leg portions 38 intercon- -nected at one end by aloopedhead portion40, the'inner diameter. of which .is substantially equal to the outer diameter of theloop 34 on the electrode end. The extended wfree endsof eachof the leg portions 38 of the spacer :members are-arcuately flared as at.42 outwardly in opposition to .one another as is best seen in Figs. 3 and 4.

In combination with spacer member 36 and electrode 26 =is1a rigid clamping .means which consists of a pair of clamping plates generally designated at 44, each of which -.cpnsists of an elongated plate-having parallel ofliset web POI'IiOHSJS and 48 interconnected intermediate the length of the plate by anangularly extending step portion 50. Thetwebportion 46 of each of the plates 44 is provided with .an .aligned central opening 52 adapted to receive flawbolt 54-therethrough. .The web portion .48 of each .of the plates isprovided with substantially marginally located transversely spaced bolt holes 56 which are aligned \bctweenthetwo plates .when assembled for clamping. lniasaemblingthe electrode, clamping means and spacer member within the precipitator, the spacer member 36 ;,1is;' tele; scop e,d downwardly over the extreme end of the electrode to bring the loop head 40 of the spacer member cjutov engagement abouhthelooped end 34 of the electrode end to dispose the leg portions 36 of the spacer member .longitudinallyofthe electrode with each leg being dis- ;rposed on the longitudinal centerline of one of theropposed ,;lectrode faces. leaving a marginal edge portion 58 on each side of the electrode throughout the length of the 1 .spacer member. ,The clamping plates are then assembled with the web portions 48 thereof engaged one with each of rtbeleg. portions of the spacer member 36 to dispose the looped portions of the electrode and spacer member with- .;-in the area defined between the diverging angular step ,portions Soot theclamping plates. .When so assembled the spacer member 36 and the electrode 26 will bedisposed centrally ofthe web portions 48 of the clamping plates to. permit bolts 60 to be inserted through the aligned Bolt .holes 56 in the .two plates for .thereception of nutst 62 son. the projected ends thereofgto rigidlyclamp the elec- ..trode and..spacenmembergbetween the webs 48. of the .Piates. .When 1 theelectrode rand spacer member have been clamped; by the web portions .48; of the plates the spacedweb portions 46 of lheplates are disposed upwardly one on'cither side of the frame 2 8,f rorn which they are looselyg suspended by. the bolt 54 extending through the .bolt holes 52 of the webportions 46 of the plates and an aligned bolt hole in the frame to permit limited movetnaent between the electrode support and the frame 28.

.The identical assembly of 1 electrode, spacer member and clamping means is provided at the lower end. of the electrode.26, however, in place of a supporting frame an eye bolt .64. or the like is engaged over the lower bolt 54 between the web portions 46 of the clamping plates, and the eyeboltjs secured to a tensioning weight 66 (Fig. 1) onto an electrode aligning means. e extreme ends of. the webportions 489i the clampg s, p a sare arc te y. flaredas at; 6 in oppositedirccnd th eg. Portions of the spa e m mber. pr j t l ng th length of theclcc ro beyo d t ecxtrernity of the clamping plates. By this construction .a rigid clamping point is avoided at the extreme ends of the clamping plates and at t-he extreme ends of the spacer trode longitudinally thereof and at the same time provides for a rigid mounting clamp for the electrode. It has been found that by maintaining an uninterrupted stress flow path along the marginal edges of ribbon type electrodes the breakage and fatigue failure of electrodes is reduced to a substantial degree and the aforedescribed construction results in such an advantageous accomplishment.

in Figs. 6 through 8 of the drawings, there is disclosed a modified embodiment of the present invention which serves to accomplish and attain all of the advantageous results obtained through. use of the form previously described but wherein certain structural details of the several components of themounting structure have been changed.

In this modified form of the invention which is utilized in conjunction with an electrode 26 of substantially identical construction to that hereinbefore described, a pair of clamping plates 70 are provided on their opposed faces with narrow elongated spacer strips 72 extending along the longitudinal centerline through the length of the plate and secured thereto by welding or the like. The remote ends of plates 70 are arcuately bevelled or rolled outwardly .as at 74 and the ;strips72 follow the arcuate surface of the plates. .Each of the plates 70 is provided with a pair of marginal spaced bolt holes 76 and the remote face of one of the plates carries the base end 78 of a hook rod 80 in rigid attachment thereto.

In assembly of this modified mounting means the spacer strip carrying faces of the two plates 70 are disposed in engagement with the opposed flat faces of the electrode 26 immediately inwardly from the looped end 34 thereof with the attached strips 72 thereon engaging the electrode Bolts 82 are then inserted through the complementary bolt holes 76 intheclamping plates on either side of the electrode and spacer strips where theextended ends receive nuts 84 providing for the rigid clamping attachment of the plates ,to the,.electrode. When the electrode has been rigidly clamped between the plates it is suspended within the precipitator by insertion of the hook rod 80 through a hook receiving aperture .86 in one of the components of the supporting frame 28.

It isagain seen by this construction that free marginal .edge portionsare provided along the length of the electrode onleither side of the spacer strips 72 within the clamping means to permit free stress flow along the electrodeedges and. at the same time the arcuate plate edges 74 eliminate a rigid flex line at the point of electrode attachment Within the clamping means.

In Figs. .5, 6 and 8 a still further modified structure is shown for attaching the lower extremity of the electrode 26 to the tensioning or alignment means 66 wherein an assembly is provided including clamping plates 88 identical in form to plates 40 described with reference to Figs. 24 which are provided with strips 90 integrally secured thereto as strips 72 were secured to plates 70.

From the foregoing-disclosures it is seen that new and useful improvements have been provided for electrode mounting assemblies whereby specific new and useful results are obtained by the use of the disclosed assemblies audit is further evident that thenovel assemblies disclosed tion c p i ing in combination an elonga ribbon typ discharge electrode, rigid clamping means having opposed faces adapted to engage and retain one end of said electrode therebetween, said clamping means having a width substantially greater than the width of said electrode and spacer means interposed between the opposed faces of the clamping means and the electrode, the width of said spacer means being less than the width of the electrode interposed therebetween.

2. The invention defined in claim 1 wherein the spacer means comprise elongated plates secured to the opposed faces of the clamping means.

3. The invention defined in claim 1 wherein the spacer means comprises a substantially U-shaped member telescoped over the end of the electrode.

4. In an electrical precipitator an electrode construction comprising in combination an elongated ribbon type discharge electrode, a pair of rigid clamping members adapted to retain opposite faces of said electrode therebetween, said clamping means having a width substantially greater than the width of said electrode, means for releasably securing said clamping members one to the other,

and spacer means interposed between the clamping surfaces of said clamping membersand the opposite faces of the electrode, the width of said spacer means being less than the width of the discharge electrode.

5. The invention defined in claim 4 wherein the spacer means comprise metal strips secured to the inner faces of the clamping members.

6. The invention defined in claim 4 wherein the spacer means comprise a substantially U-shaped member telescoped over the end of the electrode.

References Cited in the file of this patent UNITED STATES PATENTS 2,711,224 Herber June 21, 1955 FOREIGN PATENTS 338,739 Great Britain Nov. 27, 1930 1,084,937 France July 13, 1954

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