EP0074843A1 - Anode et connexion pour celle-ci - Google Patents

Anode et connexion pour celle-ci Download PDF

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Publication number
EP0074843A1
EP0074843A1 EP82304823A EP82304823A EP0074843A1 EP 0074843 A1 EP0074843 A1 EP 0074843A1 EP 82304823 A EP82304823 A EP 82304823A EP 82304823 A EP82304823 A EP 82304823A EP 0074843 A1 EP0074843 A1 EP 0074843A1
Authority
EP
European Patent Office
Prior art keywords
anode
blocks
connection
wedge
set forth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP82304823A
Other languages
German (de)
English (en)
Inventor
James R. Dimond
James B. Bushman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Harco Corp
Original Assignee
Harco Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Harco Corp filed Critical Harco Corp
Publication of EP0074843A1 publication Critical patent/EP0074843A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/50—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw
    • H01R4/5083—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw using a wedge

Definitions

  • This invention relates generally to an anode and the electrical connection to the anode as well as to a method for forming such connection.
  • Tubular anodes are widely used in cathodic protection and may be formed of a variety of material such as high silicon cast iron, graphite, carbon,magnetite, steel etc. When formed of metal such as the noted cast iron, the tubular anodes are normally centrifugally cast.
  • Internal electrical connections for such anodes may include a wire lead extending from one end or both ends.
  • Such anodes u re often times connected together in a string or series and electrically interconnected requiring a double-ended connection.
  • Wedge connections have been widely employed for tubular anodes and such connections usually take the form of a lead plate or other center cone which is driven into and forms a lead or other soft metal ring or collet surrounding the center plate.
  • the center plate may be in the form of a cone or a star-shaped plate to which the wire lead is cast and the plate is then driven into the outer ring which may deform both the center plate and the ring.
  • lead oxide may form on the components and that lead oxide is a complete insulator. Accordingly, it would be an advantage not to use lead which is now commonly employed.
  • Lead also acts as a heat sink when heated or if soldering, welding or brazing or hot sealant is employed, and this contributes to the formation of the oxide. Moreover, it has to be cooled before installation of the anode.
  • connections are extremely difficult to form with any consistent desired low level of resistance. If such connections fail to pass a resistivity test, sometimes the entire assembly must be scrapped including the expensive anodes. Also, while a pull on a wire lead in one direction may tend to tighten the wedge connection, a pull on a wire lead extending in the opposite direction would tend to pull the wedge apart. Moreover, such double-ended connections are extremely difficult to form.
  • connection completely blocks the interior of the anode as many wedge ring types do, it is then more difficult to seal the connection inside the anode.
  • the sealing material would then have to be poured into the anode from opposite ends and this is a time consuming and cumbersome task, particularly with long anodes.
  • connection It is therefore important to provide an electrical connection for such anodes which can quickly and easily be made and which will provide an assured consistency of low resistivity. It is also important that the connection be inexpensive and readily used with either single or double end connections, with a pull on the wire lead from either direction simply further tightening the connection.
  • the present invention provides a tubular anode such as tubular cast iron, magnetitie, graphite, carbon or steel, with an easily constructed and low cost internal or center connection having assured uniform low resistance characteristics.
  • the connection is formed by a pair of coplanar diametrically extending contact members or blocks with a wedge surface therebetween so that axial movement of one or axial opposite movement of both diametrically expands the contact members into locked electrical contact with the interior of the anode.
  • the blocks are generally symmetrical and have tongue and slot connection at the wedge interface to maintain the coplanar diametrical alignment.
  • the outer or parallel anode contacting surfaces may be provided with serrated teeth or ridges which on installation remove films or oxides and silicates from the internal surface of the anode tube, and also wiping the anode surface with the conductive alloy of the block. The wiping action will of course also remove any oxide films from the mating surfaces of the connection blocks. Such serrations also assist in locking the anode connection blocks in final position.
  • Both blocks have tubes extending from their smaller ends to which the lead wires may be connected by crimping the tubes and wire. This avoids the use of heat as in welding, casting or brazing.
  • the blocks may be readily formed by die casting and may be formed in various sizes, each size accomodating in turn a range of sizes of anodes.
  • the material of the blocks may be formed of conductive alloy material which is malleable to some extent.
  • the semi-rigid material may be a zinc alloy.
  • the serrated outer surfaces are crowned or arched providing a better mating with the interior curved surfaces of the tubular anode also permitting the wiping teeth to deform and match the anode I.D.
  • the blocks may be preassembled temporarily and placed inside of the tubular anode.
  • the blocks may be driven in opposite directions by a relatively simple tool, while one block may be held while the other block is driven. Each block is then wedged between the other block and the I. D . of the anode. Because of the open space on each side of the diametrically extending blocks, sealants to enclose the connections may be poured in from only one end.
  • Another principle object is the provision of such connection where the two blocks are diametrically opposed to each other and held in such position by a tongue and slot connection at the wedge interface.
  • Another important object is the provision of such blocks which have serrated parallel block-anode contact surfaces.
  • a further object is the provision of such surfaces which are serrated to provide a wiping action and to assist in locking the wedge block in place.
  • Another object is the provision of such connection wherein the blocks are formed of malleable metal such as a zinc alloy.
  • each block is provided with a tubular crimp sleeve to which a wire connection can readily, quickly and mechanically be made.
  • a further important object is the provision of such connection wherein tension on the wire even in a double-ended connection will serve simply further to tighten the connection.
  • connection It is also an object to provide a low cost method of forming an internal connection for an anode which does not require great skill and which achieves a high degree of consistency in the desired low resistivity or quality of the connection.
  • the connection also readily lends itself to field assembly.
  • the wedges may be driven together and locked in position by a rotational drive driven to a predetermined torque.
  • tubular anode 10 which as indicated may be made from a variety of materials such as high silicon cast iron, steel, graphite, magnetite, etc. If made of steel or high silicon cast iron, the anode is usually centrifugally cast in tubular form. In such case the interior surface 11 or I.D. of the anode will have a rough or irregular surface.
  • An electrical connection to the anode is provided generally at 14.
  • the connection is normally provided in the axial center of the anode because of the well-known "pencil" effect.
  • Anodes tend to discharge a high percentage of their total current from the ends of the anode and thus the ends tend to corrode first.
  • connection 14 of the present invention is formed by two mating wedge blocks 16 and 17 which are shown in greater detail in Figures 2 and 3.
  • the connection may be encapsulated by poured-in-place sealant 19 and the insulated wire lead 20 extends through the sealant and out of the end 22 of the anode through centering disc 23.
  • a wire lead extends outwardly through one end only of the anode but it will be appreciated that a double ended anode may be provided with leads extending from both ends.
  • the other wire lead in a double-ended connection would be as indicated by the phantom lines seen at 25.
  • each block 16 and 17 may be formed integrally of a malleable zinc alloy by die casting.
  • Such blocks 16 and 17 each include parallel block-anode contacting surfaces which are serrated as seen at 27 and 28, respectively. Such surfaces are also slightly crowned or arched longitudinally of the blocks as seen more clearly in Figure 3.
  • the blocks are generally triangular in shape and each includes a wedge interface as seen at 30 and 31, respectively.
  • the wedge angle may be 20° with respect to the axis of the anode. Depending upon the anode material and application, the wedge angle may vary considerably such as from about 5° to about 40° and may be greater than the angle of friction.
  • the blocks are quite similar and generally symmetrical about the wedge interface, it is noted that the block 16 includes a tongue 32 along the wedge interface while the block 17 includes a slot 33.
  • the wedge interface 30 is chamfered or relieved as indicated at 35, beyond the tongue 32 while the wedge interface 31 is relieved in a similar manner at 36 on each side of the slot, 33. This permits clearance with the tubular extensions projecting at 38 and 39 from the smaller end faces 40 and 41 of the blocks 16 and 17, respectively.
  • the bare end is simply inserted into the respective tube and the tube is then crimped on the bare lead end as indicated at 43 in Figure 1.
  • Each block is provided with a solid center web more narrow than the total width of the block and of the triangular configuration seen at 45 and 46.
  • the web is, of course, of sufficient thickness to resist the compressive forces on the block when in tight wedged engagement in the anode.
  • the larger end faces of the block seen at 47 and 48, respectively, extend normal to the axis of the anode and may be engaged or tapped by simplified driving tools seen in phantom lines in Figure 2 at 50 and 51, respectively.
  • the blocks are first preassembled in the relative positions seen by the phantom lines in Figure 2.
  • the block 17 will achieve the pcsition seen at 53 with its surface 28 having some clearance indicated at 54 within the I.D. of the tube seen at 55.
  • the surface 27 of the opposite block 16 simply rests on the I.D. of the tube as seen at 56.
  • the blocks may be held together in their preassembled relationship shown by the suitable temporary fastener such as a piece of tape seen at 57, or by a conductive shim in the interface between the tongue and slot.
  • the driving tools 50 and 51 are employed to drive the blocks in the opposite direction as seen by the arrows 60 and 61. This causes the wedge interface of the two blocks to diametrically separate the blocks closing the clearance 54 and driving the surfaces 27 and 28 first into wiping engagement and then into locking engagement with the I.D. 11 of the tube.
  • the serrations on the surfaces 27 and 28 include acutely angled leading edges 63 and sharply angled trailing edges 64 to achieve the noted initial wiping action without unduly resisting the driving of the clocks into locking engagement.
  • the more sharply defined edges 64 assist in locking the blocks in position when driven to the desired locking pressure.
  • Such wiping action of the ridges of the serrations serve to remove films or oxides and silicates from the internal surfaces of the anode tube, and also to smear the semi-rigid material of the block such as a zinc alloy along the inside surface of the anode.
  • Such semi-rigid material also readily conforms to any irregularities normally found in the internal surface of centrifugally cast anodes.
  • the wedge blocks are normally assembled as seen in Figure 2 with the lead wire connections already made. It will also be appreciated that the lead wire connections may be made from both blocks and that any tension or pulling on the wires will simply tend to tighten the connection.
  • the blocks can easily be removed by using the tools 50 and 51 to drive the blocks in the opposite direction engaging the more narrow end faces thereof.
  • the -locks and anodes may be reused. Such techniques can be used to avoid scrap anodes which are very costly and to assure quality control.
  • the blocks may even be removed after the sealants are in place. Depending on the particular sealant employed, it may be drilled out or removed and then the blocks removed
  • the serrations on the surfaces 27 and 28 which wipe in one direction and lock in the opposite direction may vary as to the number of teeth and coarseness thereof.
  • the configuration of the serration normally depends on the material of the anode. For example, in a graphite anode, . there may be two to three times as many teeth providing a much finer texture.
  • the crowned serrated outer surfaces permit ensured good wiping and locking contact with the interior of the anode and tend to match the circle of the anode regardless of the diameter of the anode.
  • the crowned serrated surface 28 engages and wipes primarily along the lateral edges of the surface as seen at 67 and 68.
  • the wiping and engaging action is primarily at the center of the crown as seen at 71. In either case such action tends to change the radius of the crown to conform to the anode.
  • blocks 16 and 17 may be formed in a variety of sizes to accomodate for each size a fairly wide range of anode sizes.
  • the block 16 is provided along the top of the tongue 32 with a yieldable shim 74 which is in the form of a leaf spring held in place by flush head fastener or rivet 75.
  • the spring compensates for expansion or contraction of the anode I.D. in high temperature operating conditions or in fluctuating temperature operating conditions.
  • connection is preferably formed at the middle of the anode, it will be appreciated that it can be formed as quickly anywhere along the interior of the anode.
  • connection may be readily encased or encapsulated in plastic sealants such as epoxies or the like by forming a temporary dam indicated at 78 then pouring sealant 19 in from the open upper end 22. Because of the relatively large semi-circular open spaces on each side of the wedge blocks as seen at 80 and 81 in Figure 4, the sealant will readily flow past the connection.
  • the wire or lead extends outwardly and then through the centering disc which of course may be provided at both ends in connection with a double ended anode.
  • the wedge blocks 83 and 84 may be substantially the same or similar to the wedge blocks 16 and 17 seen in Figure 2.
  • the larger end wall 85 of the wedge block 83 is provided with horizontally aligned corner notches 86 which receive a wire cinch or band 87 which encircles both wedge blocks.
  • the larger end wall 88 of the wedge block 84 is provided with blind untapped hole 90 receiving threaded stud 91 which is provided with a hexagonal head 92.
  • a nut 94 mounteded on the threaded stud is a nut 94 to which the opposite ends of the wire or band cinch 87 are secured as seen at 95.
  • the wedge blocks are then assembled in the position shown by full lines and by then driving the hexagonal head to rotate the threaded stud 91, the nut 94 is drawn away from the end wall 88 forcing the top block 84 to the left and the bottom block 83 to the right as seen in Figure 8, driving the top block up to the relative position seen in phantom lines at 96.
  • the stud and nut then act as a reaction member between the cinch and the blocks driving the blocks into wedge locking relationship within the interior of the anode.
  • the wedge blocks are provided with the wire lead crimp sleeves or tubes seen at 98 and 99, respectively.
  • the threaded stud 91 may readily be rotated inside the anode by a suitable socket heat extension and the wedges may be tightened to a predetermined torque to provide the desired wedge locking action and the low resistance connection.
  • This construction enables connections readily to be made in tubular anodes where one end may be closed.
  • the cinch or band being inherently elastic acts as a spring lock keeping pressure on the wedge blocks regardless of minor anode I.D. variations due to temperature expansions and contractions.
  • each of the mating blocks 101 and 102 is provided with two angularly related legs at approximately 90° as seen at 103 and 104 for the block 101, and 105 and 106 for the block 102.
  • the connection then provides four contact surfaces inside the tubular anode 107 as seen at 108, 109, 110 and lll.
  • the contact surfaces 108 and 110 are diametrically opposed to each other while the surfaces 109 and 111 are also diametrically opposed.
  • the wire lead crimp tubes 113 and 114 may extend from the legs 106 and 103, respectively, but it will be appreciated that they may be provided on each leg and in different positions.
  • each wedge block includes at least two anode contacting surfaces and that the connection is in the form of an X with each contacting surface approximately 90° apart.
  • connection does not require expansion or distortion of the anode.
  • connection With the connection a single or double-ended connection can readily be made and any tension on the lead wire serves simply to tighten the connection.
  • one size of connector components will handle a wide range of sizes of anodes and the wiping teeth or serrations on the curved or crowned connection-anode surfaces tend to deform to match the anode I.D.
  • the connection can simply and quickly be made, even in the field, or removed if need be.

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  • Prevention Of Electric Corrosion (AREA)
EP82304823A 1981-09-16 1982-09-13 Anode et connexion pour celle-ci Withdrawn EP0074843A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US30285581A 1981-09-16 1981-09-16
US302855 1981-09-16

Publications (1)

Publication Number Publication Date
EP0074843A1 true EP0074843A1 (fr) 1983-03-23

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EP82304823A Withdrawn EP0074843A1 (fr) 1981-09-16 1982-09-13 Anode et connexion pour celle-ci

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EP (1) EP0074843A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19743867C1 (de) * 1997-10-04 1999-04-22 Flohe Gmbh & Co Lösbare Verbindung eines Hochstromkabels mit einem sammelschienenartigen Anschlußschwert
KR101312432B1 (ko) 2011-12-21 2013-10-14 주식회사 우진 전기방식용 ｍｍｏ 튜블러 애노드의 접속장치

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1091164B (de) * 1958-10-25 1960-10-20 Lynenwerk Kg Abspannklemmvorrichtung zur Zugentlastung der Verbindungsstelle von elektrischen Freileitungen
DE2436888A1 (de) * 1974-07-31 1976-02-19 Siemens Ag Anordnung zur verbindung isolierter elektrischer leiter
GB1514696A (en) * 1976-03-17 1978-06-21 Amp Inc Method of and electrical connector for terminating a wire

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1091164B (de) * 1958-10-25 1960-10-20 Lynenwerk Kg Abspannklemmvorrichtung zur Zugentlastung der Verbindungsstelle von elektrischen Freileitungen
DE2436888A1 (de) * 1974-07-31 1976-02-19 Siemens Ag Anordnung zur verbindung isolierter elektrischer leiter
GB1514696A (en) * 1976-03-17 1978-06-21 Amp Inc Method of and electrical connector for terminating a wire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19743867C1 (de) * 1997-10-04 1999-04-22 Flohe Gmbh & Co Lösbare Verbindung eines Hochstromkabels mit einem sammelschienenartigen Anschlußschwert
KR101312432B1 (ko) 2011-12-21 2013-10-14 주식회사 우진 전기방식용 ｍｍｏ 튜블러 애노드의 접속장치

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19830913

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19850228

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BUSHMAN, JAMES B.

Inventor name: DIMOND, JAMES R.