EP2702653A1 - High-voltage electrode arrangement - Google Patents

High-voltage electrode arrangement

Info

Publication number
EP2702653A1
EP2702653A1 EP12721379.1A EP12721379A EP2702653A1 EP 2702653 A1 EP2702653 A1 EP 2702653A1 EP 12721379 A EP12721379 A EP 12721379A EP 2702653 A1 EP2702653 A1 EP 2702653A1
Authority
EP
European Patent Office
Prior art keywords
electrode
voltage
insulating material
tip
arrangement
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.)
Granted
Application number
EP12721379.1A
Other languages
German (de)
French (fr)
Other versions
EP2702653B1 (en
Inventor
Xavier ROLLET
Thomas Vinnay
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.)
Illinois Tool Works Inc
Original Assignee
Illinois Tool Works Inc
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 Illinois Tool Works Inc filed Critical Illinois Tool Works Inc
Publication of EP2702653A1 publication Critical patent/EP2702653A1/en
Application granted granted Critical
Publication of EP2702653B1 publication Critical patent/EP2702653B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T19/00—Devices providing for corona discharge
    • H01T19/04—Devices providing for corona discharge having pointed electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T23/00—Apparatus for generating ions to be introduced into non-enclosed gases, e.g. into the atmosphere

Definitions

  • the present invention relates to a high-voltage electrode arrangement for charging or discharging an object, said high-voltage electrode arrangement having a housing with an end face and at least one side wall which is adjacent to the end face.
  • the high-voltage electrode arrangement also has at least one electrode, wherein the at least one electrode is formed of an electrode body and an electrode tip.
  • the at least one electrode is arranged on the housing, wherein the effective area of at least the tip of the electrode is arranged outside the housing at the end face, that is to say the high-voltage electrode arrangement generally protrudes some way from the housing, generally in the area of the end face of the housing.
  • High-voltage electrode arrangements of this type are known in principle from the prior art and are used for charging and discharging objects, in particular moving objects such as material webs.
  • moving objects such as material webs.
  • a multiplicity of electrode tips arranged side by side are often provided, each protruding from the housing in the area of the end face.
  • These parts, referred to as electrode tips, protruding from the housing generally lead into an electrode body, wherein the electrode body and the electrode tip are interconnected in an electrically conductive manner.
  • a high-value resistor is normally connected to the electrode body or forms part of the electrode body, a high-voltage in the region of a number of kV being applied to said resistor so that an electric induction field can form in the area of the electrode tips or so that, at correspondingly high voltages, a current-limited corona field can form, which then charges or discharges the material web moved past.
  • the high-value resistor is used to decouple the respective electrode tips from one another.
  • creeping paths are produced on the surface of the housing if the housing is formed of insulating material. Since the housing is normally fastened to earthed machine parts, a conductive path to these earthed parts can be produced via the creeping paths over the surface of the housing, possibly resulting in flashover for example.
  • the individual electrodes are also coupled separately by means of the electrode tips to the high-voltage source, for example a high-voltage generator.
  • the pollution between the electrode tips thus also has a negative effect on the separate electrode coupling, which is no longer ensured, since undesired creep paths may also form between the electrode tips .
  • parts of the surface of the housing are burned along these creep paths. Carbon is deposited at burn-up marks of this type and is characterized by undesired, good conductivity and cannot be removed sufficiently by cleaning of these burn-up marks. These creep paths thus persist along burn-up marks, even after cleaning.
  • the object of the present invention therefore is to develop a high- voltage electrode arrangement of the type described in the introduction such that pollution, in particular pollution in the area between the electrode tips and on the housing, can be removed more easily.
  • a high-voltage electrode arrangement having at least one electrode is formed such that a replaceable insulating material is provided between the electrode tip and the electrode body of the at least one electrode, wherein the replaceable insulating material substantially completely surrounds the electrode in said area, and wherein said replaceable insulating material is arranged outside the housing of the high-voltage electrode arrangement.
  • One of the advantages of the solution according to the invention compared to the conventional high-voltage electrode arrangement described in the introduction is the improved possibility for cleaning the insulating material, which in particular enables easier cleaning of the area between the electrode tips.
  • pollution which has settled in this area and which has been positively drawn into and has settled in this area in the form of pollution due to the electric field produced at the high-voltage electrode arrangement and due to the discharge, in particular corona discharge, produced there can thus be easily removed.
  • Undesired discharges over the creep paths formed along this pollution can thus be avoided effectively by the simple possibility of removing this pollution.
  • the simple possibility for cleaning is provided in particular by the ability to replace the insulating material, and therefore the area between the electrode tips does not have to be accessible to a cleaning device for cleaning purposes. Rather, the pollution is removed when the insulating material is removed.
  • the insulating material at least partially covers the end face of the housing.
  • the insulating material may at least partially cover one or more side walls of the housing.
  • the area in which pollution can be removed easily and effectively can thus be enlarged, whereby the likelihood of formation of a creep path capable of discharge can be reduced further.
  • the insulating material may be provided in the form of a ribbon.
  • This ribbon is preferably made of a plastic, in particular a flexible plastic. Due to the formation as a ribbon made of insulating material, this ribbon can be fastened for example to one of the side walls or to a multiplicity of side walls of the housing, thus producing a tight seal with respect to pollution.
  • a minimal creep path in particular from an electrode tip to the next earthed housing part can be reduced by covering parts of the side wall with the ribbon, in particular the flexible plastic ribbon.
  • the housing is formed of an insulating material, there is the advantage of reducing the minimal creep path, since in this case a housing part is generally connected to an earthed machine part, for example the machine frame.
  • a ribbon of this type can particularly preferably connect a multiplicity of electrodes, and in particular, where a multiplicity of electrodes are provided, the electrodes are surrounded by such a connecting ribbon in the area between the electrode tip and the electrode body.
  • the ribbon is to be formed integrally.
  • the insulating material is an adhesive plastic material, whether in the form of a ribbon or otherwise. It is particularly preferable to use polyurethane . Due to the adhesive effect of such an adhesive plastic material, it is ensured that the material adheres to the housing and produces the tightest possible seal. Due to the tight connection to the housing or to the area between the electrode tips at the end face, the possibility that undesired creep paths can form as a result of pollution is further reduced.
  • the electrode tip of the at least one electrode can preferably be removed from the electrode body which receives it. Due to a removable design of this type, electrodes which, for example, are worn due to signs of burn-up appearing during normal operation, can be easily replaced. In particular it is also possible, due to electrode tips formed in such a removable manner, to clear pollution from the area formed around said tips and from the area covered by the insulating material more easily when the electrode tips have been removed, for example in an ultrasonic bath or another cleaning bath.
  • the electrode tips may be surrounded by insulating material, for example in the form of a ribbon, such that a contact area of the electrode tips is provided on one side of the ribbon made of insulating material and an effective area of the electrode tips is provided on the other side.
  • a ribbon of this type can be an extruded ribbon made of polyurethane, into which wires are inserted which then form the electrode tips with their contact area on one side of the ribbon and their effective area on the other side of the ribbon.
  • the high-voltage electrode arrangement may expediently have at least one holding device, in particular in the area of its end face, wherein such a holding device is used to hold at least the removable electrode tip, but for example also the combination of removable electrode tip and insulating material. Due to a holding device of this type, it is particularly easy to lock the electrode tip of the at least one electrode on the end face of the high-voltage electrode arrangement.
  • a contact-making device is particularly expediently provided on such a holding device, wherein the contact-making device is used to produce an electrical contact, when a replaceable electrode tip is inserted, between this tip and the electrode body of the at least one electrode.
  • the at least one holding device can be formed as a magnetic holding device which cooperates with a magnet area formed on the removable electrode tip of the at least one electrode. Due to this cooperation, the electrode tip is therefore held by magnet force in the holding device, which makes it possible to exchange the tip in a particularly simple manner. Furthermore, the magnet area of the electrode tip may simultaneously be used for contacting thereof, that is to say, when the electrode tip is inserted, it produces electrical contact between the tip and the electrode body by means of a contact-making device provided. The coupling via the magnet thus combines the components which are reguired on the one hand to hold, that is to say lock, the electrode tip in position and on the other hand to make contact therewith.
  • the at least one holding device may also be formed as a coupling device, wherein this coupling device cooperates with a counter coupling element, that is to say a coupling area on the electrode tip, such that the electrode tip is mechanically held in the holding device. Due to suitable coupling devices, an effective and simple option for exchange of the electrode tips with simultaneous locking is thus likewise provided.
  • the coupling area of the electrode tip of the at least one electrode can cooperate with a provided contact-making device so as to produce an electrical contact between the electrode tip on the one hand and the electrode body on the other hand. In this way too, components for the function of locking on the one hand and for the function of contact-making on the other hand are saved with mechanical locking.
  • the at least one holding device can just as easily be formed as an adhesion holding device.
  • the removable electrode tip and the insulating material are in particular interconnected such that merely the adhesive effect of the insulating material on the at least one holding device, which is formed in this case as an adhesion holding device, allows the electrode tip to be locked and held in position in the area of the end face of the high-voltage electrode arrangement .
  • the end face or alternatively or additionally the at least one side wall of the housing are smooth, since a smooth surface improves the adhesive effect of the insulating material on the sides and/or walls in guestion.
  • the thickness of the insulating material lies in the region of a few millimeters. In particular, the thickness of such a ribbon lies in the range of 0.5 and 5 mm.
  • the expression "thickness of the ribbon” is understood to mean the extension of the ribbon in any direction in which the ribbon extends least. Due to a ribbon formed in such a thin manner, it is ensured in particular that the ribbon remains flexible enough to cover the end face and possibly the side walls of the high-voltage electrode arrangement with sufficient sealing effect.
  • the insulating material in particular the ribbon, can be provided with an adhesive and an adhesive bond can thus be created.
  • Figure 1 shows a perspective obligue view of the high- voltage electrode arrangement according to the invention
  • Figure 2 shows a sectional view on the narrow side of the high-voltage electrode arrangement from figure 1 with a holding device in accordance with a first exemplary embodiment
  • Figure 3 shows a sectional view on the narrow side of the high-voltage electrode arrangement according to figure 1 with a holding device in accordance with a second exemplary embodiment
  • Figure 4 shows a sectional view on the narrow side of the high-voltage electrode arrangement from figure 1 with a holding device in accordance with a third exemplary embodiment.
  • Figure 1 shows a perspective obligue view of a high- voltage electrode arrangement 100 according to the invention which is arranged in front of an object to be charged or discharged, in the example shown in accordance with figure 1 a material web 101.
  • the high- voltage electrode arrangement 100 has a housing 10, which in the example shown has an end face 11 of rectangular area and accordingly four side walls 12 adjacent thereto.
  • the side walls 12 of the housing 10 are normally made of metal and are earthed.
  • a multiplicity of electrode tips 22 are arranged in the area of the end face 11 and are electrically connected to electrode bodies 21 arranged inside the housing 10.
  • the electrode tips 22 protrude just slightly beyond the end face 11 of the housing 10, as shown in figure 1; however, it is also possible to arrange the electrode tips 22 such that they protrude from the housing 10 to a greater or lesser extent accordingly.
  • Each electrode tip 22 forms an electrode 20 together with its respective electrode body 21.
  • only one electrode body 21 is shown in figure 1, wherein this electrode body 21 is of course arranged inside the housing 10.
  • the other electrode tips 22 in figure 1 are also connected to a similar electrode body 21, covered by one of the side walls 12, and thus form an electrode 20 in each case.
  • An insulating material 30 is provided in the area between the electrode tips 22 and the respective electrode bodies 21 and is formed as a ribbon 31 in the example shown in figure 1 and substantially completely surrounds the electrode tips 22 and electrode bodies 21 in the vicinity of the connection therebetween. Due to the ribbon 31 made of insulating material 30, which lies substantially completely tightly against the end face 11 in the example shown in accordance with figure 1, it is ensured that, during operation of the high- voltage electrode arrangement 100, that is to say when a high voltage of a number of kilovolts is applied to the electrodes, pollution settles on the ribbon 31, above all in the area between the electrode tips 22, where it can be removed more easily than if it were to settle directly on the end face 11 in the area between the electrode tips 22.
  • the insulating material 30 formed as a ribbon 31 according to the example in figure 1 consists of polyurethane and is only a few millimeters thick so that it is very flexible and, due to the adhesion provided by the material, sticks adhesively to the end face 11, which is smooth in the example shown in accordance with figure 1. It is thus ensured, as a result of the tightness thus produced in the area of the ribbon, that conductive pollution such as ink or the like does not infiltrate the area between the ribbon 31 and the end face 11, but settles exclusively on the ribbon 31.
  • At least one electrode body 21 is embedded in the housing 10, wherein the electrode body 21 is formed as a resistor 25 in all three exemplary embodiments shown in accordance with figures 2 to 4.
  • the electrode body 21 of the at least one electrode 20 is held in position by means of an embedding compound 26, which fills the interior of the housing 10.
  • a holding device 40 for holding an electrode tip 22 is provided in the area of the end face of the electrode body 21 and is formed as a coupling device 40b in the first exemplary embodiment shown.
  • the coupling device 40b cooperates with a coupling area 24 of the electrode tip 22 so that the electrode tip 22 is held in position by means of the holding device 40 formed as a coupling device 40b.
  • the actual effective area of the electrode tip 22 protrudes beyond the end face 11 of the high-voltage electrode arrangement 100 in the exemplary embodiment shown, whilst the coupling area 24 of the electrode tip passes through the end face 11 in the exemplary embodiment shown and is received in the housing interior.
  • An insulating material 30 is provided in this coupling area, that is to say in the transition area between the effective area of the electrode tip 22 and the electrode body 21, and is again formed as a ribbon 31 made of insulating material 30.
  • the ribbon 31 covers the end face 11 completely and lies tightly against the end face 11.
  • the ribbon 31 is connected rigidly to the electrode tip 22 in the area between the effective area 28 of the electrode tip 22 and the coupling area 24 of the electrode tip 22.
  • the electrode tip 22 pierces the ribbon 31 so that the ribbon 31 tightly surrounds the transition area between the effective area 28 and the coupling area 24 of the electrode tip 22. It is thus ensured that, due to the tightness thus produced, pollution can only deposit on the ribbon 31 and not in the area of the end face 11 arranged below.
  • the coupling area 40b is also formed such that it allows the electrode tip 22 to be removed, that is to say replaced. Since the electrode tip 22 is connected rigidly and tightly to the ribbon 31, and since a multiplicity of electrode tips 22 are mechanically interconnected by means of the ribbon 31, it is particularly easy to replace the electrode tips 22 by simply removing the ribbon 31 together with the electrode tips 22 once the coupling devices 40b have been released. The deposited pollution in particular in the area between the electrode tips 22 is then removed when the electrode tips 22 are changed together with the ribbon 31 made of insulating material 30 and, depending on the nature and type of pollution, the electrode tips are either cleaned together with the ribbon 31 or are replaced completely.
  • Figure 3 likewise shows a sectional view on the narrow side of the high-voltage electrode arrangement 100 according to figure 1, wherein, in this second exemplary embodiment in accordance with figure 3, compared to the first exemplary embodiment shown in figure 2, the holding device 40 is now formed as a magnetic holding device 40a in the electrode body 21 formed as a resistor 25.
  • a magnet area 23 is accordingly provided on the electrode tip 22 so that, similarly to the first exemplary embodiment, the inserted electrode tip 22 is held in position by means of magnet force, that is to say by magnetic contact between the magnet area 23 of the electrode tip 22 and the magnetic holding device 40a.
  • the insulating material 30 is in the form of a ribbon 31, wherein the at least one electrode tip 22 is again embedded in the ribbon 31 in a tightly surrounded manner such that the magnet area 23 is arranged on one side of the ribbon 31 and the effective area 28 of the electrode tip 22 is arranged on the other side of the ribbon 31.
  • FIG 4 again shows a sectional view on the narrow side of the high-voltage electrode arrangement 100 according to the invention.
  • the insulating material 30 is formed as a ribbon 31 protruding far beyond the side walls 12 of the housing 10 and which can be placed or folded over the edges of the housing due to its flexibility so that it lies substantially completely against the end face 11 and the side walls 12.
  • an adhesion holding device 40c is provided for particularly close contact between the ribbon 31 and the housing structures and, for example, can be provided in the form of particularly smooth housing parts, for example particularly smooth side walls 12. Due to the adhesive effect of the ribbon 31 in the event of contact with an adhesion holding device 40c of this type, it is thus again possible to lock the at least one electrode tip 22, which is embedded in the ribbon 31 similarly to the exemplary embodiments from figures 2 and 3, that is to say to hold it in position with respect to the housing 10.
  • the electrode tip 22 is contacted with the electrode body 21 associated therewith by a spring contact 27 which is provided on the electrode body and which produces electric contact with a contact area 29 of the electrode tip 22 by means of spring force.
  • a spring contact 27 which is provided on the electrode body and which produces electric contact with a contact area 29 of the electrode tip 22 by means of spring force.
  • a resistor 25 in particular does not necessarily have to be provided.
  • the electrode body 21 is coupled directly to the high-voltage source.
  • the electrode tip 22 and the electrode body 21 can also be provided as a single unit so that this unit is connected directly to the high-voltage source, that is to say without a resistor 25.
  • an insulating material 30, preferably a ribbon 31 is provided in an area between the electrode tip 22 and the electrode body 21 of the unit.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Abstract

A high-voltage electrode arrangement (100) is specified for charging or discharging an object, in particular a moving material web. In this case, the high-voltage electrode arrangement (100) has a housing (10) with an end face (11) and at least one side wall (12) which is adjacent to the end face (11) as well as at least one electrode (20) consisting of an electrode body (21) and an electrode tip (22), wherein the electrode tip acts outside the housing (10) of the high-voltage electrode arrangement (100). With the aim of making it possible to more easily remove undesirable conductive dirt particles, which have a negative influence on the field effect of the electrical field produced by the high-voltage electrode arrangement (100), particularly in the area between the electrode tips, the invention provides that a replaceable insulating material (30) is provided in a connecting area between the electrode tip (22) and the electrode body (21) and essentially completely surrounds this area, with the replaceable insulating material (30) being arranged outside the housing (10) of the high-voltage electrode arrangement (100).

Description

High-voltage electrode arrangement
The present invention relates to a high-voltage electrode arrangement for charging or discharging an object, said high-voltage electrode arrangement having a housing with an end face and at least one side wall which is adjacent to the end face. The high-voltage electrode arrangement also has at least one electrode, wherein the at least one electrode is formed of an electrode body and an electrode tip. The at least one electrode is arranged on the housing, wherein the effective area of at least the tip of the electrode is arranged outside the housing at the end face, that is to say the high-voltage electrode arrangement generally protrudes some way from the housing, generally in the area of the end face of the housing.
High-voltage electrode arrangements of this type are known in principle from the prior art and are used for charging and discharging objects, in particular moving objects such as material webs. In the case of conventional high-voltage electrode arrangements of this type, which act on moving material webs, for example paper webs or plastic film webs, a multiplicity of electrode tips arranged side by side are often provided, each protruding from the housing in the area of the end face. These parts, referred to as electrode tips, protruding from the housing generally lead into an electrode body, wherein the electrode body and the electrode tip are interconnected in an electrically conductive manner. A high-value resistor is normally connected to the electrode body or forms part of the electrode body, a high-voltage in the region of a number of kV being applied to said resistor so that an electric induction field can form in the area of the electrode tips or so that, at correspondingly high voltages, a current-limited corona field can form, which then charges or discharges the material web moved past. The high-value resistor is used to decouple the respective electrode tips from one another.
With conventional high-voltage electrode arrangements of this type there is the disadvantage, inter alia, that undesired, charged particles of dirt or, for example, conductive inks or the like settle in the area between the electrode tips and on the end face and/or side walls of the housing and form a conductive film of dirt due to the electric field formed and its influence on charged particles. The electrostatic field and also, where applicable, the corona discharge will thus be influenced negatively, since creeping paths are produced between the electrode tips or from the individual electrode tips to the housing.
In the former case, the creep paths between the electrode tips annul the respective decoupling thereof, since the decoupling resistors are bypassed. In the other case, creeping paths are produced on the surface of the housing if the housing is formed of insulating material. Since the housing is normally fastened to earthed machine parts, a conductive path to these earthed parts can be produced via the creeping paths over the surface of the housing, possibly resulting in flashover for example.
For improved control of the discharging effect, in particular with use of high-voltage electrode arrangements of the conventional type to generate corona discharges, the individual electrodes are also coupled separately by means of the electrode tips to the high-voltage source, for example a high-voltage generator. The pollution between the electrode tips thus also has a negative effect on the separate electrode coupling, which is no longer ensured, since undesired creep paths may also form between the electrode tips . In addition to the direct and immediate risk of creep discharges of this type, for example in areas at risk of explosion, in the case of creep paths which run in particular over the insulating housing towards the machine frame, parts of the surface of the housing are burned along these creep paths. Carbon is deposited at burn-up marks of this type and is characterized by undesired, good conductivity and cannot be removed sufficiently by cleaning of these burn-up marks. These creep paths thus persist along burn-up marks, even after cleaning.
It is also often only very difficult to clean the housing and the gaps between the electrodes, that is to say to remove the undesired deposits from the housing and, in particular, from the area between the electrode tips, since the space between the electrode tips, that is to say the distance between the tips, is generally very small, and also since pollution of this type cannot be removed easily from the generally non-metal material between the electrode tips and from the housing of the high-voltage electrode arrangement due to the nature of the material. Based on the problem detailed above, the object of the present invention therefore is to develop a high- voltage electrode arrangement of the type described in the introduction such that pollution, in particular pollution in the area between the electrode tips and on the housing, can be removed more easily.
In the case of a high-voltage electrode arrangement according to the invention, this object is achieved by the features of claim 1. The object is achieved in particular in that a high-voltage electrode arrangement having at least one electrode is formed such that a replaceable insulating material is provided between the electrode tip and the electrode body of the at least one electrode, wherein the replaceable insulating material substantially completely surrounds the electrode in said area, and wherein said replaceable insulating material is arranged outside the housing of the high-voltage electrode arrangement.
One of the advantages of the solution according to the invention compared to the conventional high-voltage electrode arrangement described in the introduction is the improved possibility for cleaning the insulating material, which in particular enables easier cleaning of the area between the electrode tips. In particular, pollution which has settled in this area and which has been positively drawn into and has settled in this area in the form of pollution due to the electric field produced at the high-voltage electrode arrangement and due to the discharge, in particular corona discharge, produced there can thus be easily removed. Undesired discharges over the creep paths formed along this pollution can thus be avoided effectively by the simple possibility of removing this pollution.
The simple possibility for cleaning is provided in particular by the ability to replace the insulating material, and therefore the area between the electrode tips does not have to be accessible to a cleaning device for cleaning purposes. Rather, the pollution is removed when the insulating material is removed.
Advantageous developments of the invention are disclosed in the dependent claims.
For example, the insulating material at least partially covers the end face of the housing. Alternatively or in addition, the insulating material may at least partially cover one or more side walls of the housing. The area in which pollution can be removed easily and effectively can thus be enlarged, whereby the likelihood of formation of a creep path capable of discharge can be reduced further. Furthermore, the insulating material may be provided in the form of a ribbon. This ribbon is preferably made of a plastic, in particular a flexible plastic. Due to the formation as a ribbon made of insulating material, this ribbon can be fastened for example to one of the side walls or to a multiplicity of side walls of the housing, thus producing a tight seal with respect to pollution. If the housing is made of metal, a minimal creep path in particular from an electrode tip to the next earthed housing part, that is to say in particular to a side wall of the housing, can be reduced by covering parts of the side wall with the ribbon, in particular the flexible plastic ribbon. Even if the housing is formed of an insulating material, there is the advantage of reducing the minimal creep path, since in this case a housing part is generally connected to an earthed machine part, for example the machine frame. A ribbon of this type can particularly preferably connect a multiplicity of electrodes, and in particular, where a multiplicity of electrodes are provided, the electrodes are surrounded by such a connecting ribbon in the area between the electrode tip and the electrode body. In particular, the ribbon is to be formed integrally. With a high-voltage electrode arrangement of this type having a multiplicity of electrodes, this development ensures that substantially the entire area between the electrode tips of the multiplicity of electrodes is covered, without any risk of additional creep paths being formed by possible pollution in overlapping areas, for example due to the patching of a multiplicity of areas made of insulating material .
It is particularly advantageous if the insulating material is an adhesive plastic material, whether in the form of a ribbon or otherwise. It is particularly preferable to use polyurethane . Due to the adhesive effect of such an adhesive plastic material, it is ensured that the material adheres to the housing and produces the tightest possible seal. Due to the tight connection to the housing or to the area between the electrode tips at the end face, the possibility that undesired creep paths can form as a result of pollution is further reduced.
Furthermore, the electrode tip of the at least one electrode can preferably be removed from the electrode body which receives it. Due to a removable design of this type, electrodes which, for example, are worn due to signs of burn-up appearing during normal operation, can be easily replaced. In particular it is also possible, due to electrode tips formed in such a removable manner, to clear pollution from the area formed around said tips and from the area covered by the insulating material more easily when the electrode tips have been removed, for example in an ultrasonic bath or another cleaning bath.
It is also particularly preferable to form not only the electrode tips themselves, but also the insulating material, so as to be removable together from the electrode body of the at least one electrode. Changing the electrode tips thus involves changing the insulating material polluted by operation, wherein fresh, that is to say unpolluted, insulating material is provided on the high-voltage electrode arrangement when the electrode tips are exchanged. The pollution on the insulating material is thus also removed at the same time when the electrode tips are exchanged. In particular, the electrode tips may be surrounded by insulating material, for example in the form of a ribbon, such that a contact area of the electrode tips is provided on one side of the ribbon made of insulating material and an effective area of the electrode tips is provided on the other side. For example, a ribbon of this type can be an extruded ribbon made of polyurethane, into which wires are inserted which then form the electrode tips with their contact area on one side of the ribbon and their effective area on the other side of the ribbon.
The high-voltage electrode arrangement may expediently have at least one holding device, in particular in the area of its end face, wherein such a holding device is used to hold at least the removable electrode tip, but for example also the combination of removable electrode tip and insulating material. Due to a holding device of this type, it is particularly easy to lock the electrode tip of the at least one electrode on the end face of the high-voltage electrode arrangement.
Additionally, a contact-making device is particularly expediently provided on such a holding device, wherein the contact-making device is used to produce an electrical contact, when a replaceable electrode tip is inserted, between this tip and the electrode body of the at least one electrode. With releasable electrode tips, a simple contacting option for the purposes of operation of the high-voltage electrode arrangement is thus created in addition to the locking and holding of the tip in position.
The at least one holding device can be formed as a magnetic holding device which cooperates with a magnet area formed on the removable electrode tip of the at least one electrode. Due to this cooperation, the electrode tip is therefore held by magnet force in the holding device, which makes it possible to exchange the tip in a particularly simple manner. Furthermore, the magnet area of the electrode tip may simultaneously be used for contacting thereof, that is to say, when the electrode tip is inserted, it produces electrical contact between the tip and the electrode body by means of a contact-making device provided. The coupling via the magnet thus combines the components which are reguired on the one hand to hold, that is to say lock, the electrode tip in position and on the other hand to make contact therewith.
However, the at least one holding device may also be formed as a coupling device, wherein this coupling device cooperates with a counter coupling element, that is to say a coupling area on the electrode tip, such that the electrode tip is mechanically held in the holding device. Due to suitable coupling devices, an effective and simple option for exchange of the electrode tips with simultaneous locking is thus likewise provided. In this case too, the coupling area of the electrode tip of the at least one electrode can cooperate with a provided contact-making device so as to produce an electrical contact between the electrode tip on the one hand and the electrode body on the other hand. In this way too, components for the function of locking on the one hand and for the function of contact-making on the other hand are saved with mechanical locking.
However, the at least one holding device can just as easily be formed as an adhesion holding device. In this case, the removable electrode tip and the insulating material are in particular interconnected such that merely the adhesive effect of the insulating material on the at least one holding device, which is formed in this case as an adhesion holding device, allows the electrode tip to be locked and held in position in the area of the end face of the high-voltage electrode arrangement . In this case it is particularly advantageous if the end face or alternatively or additionally the at least one side wall of the housing are smooth, since a smooth surface improves the adhesive effect of the insulating material on the sides and/or walls in guestion. The thickness of the insulating material, that is to say in particular the thickness of an insulating material formed as a ribbon, lies in the region of a few millimeters. In particular, the thickness of such a ribbon lies in the range of 0.5 and 5 mm. The expression "thickness of the ribbon" is understood to mean the extension of the ribbon in any direction in which the ribbon extends least. Due to a ribbon formed in such a thin manner, it is ensured in particular that the ribbon remains flexible enough to cover the end face and possibly the side walls of the high-voltage electrode arrangement with sufficient sealing effect.
Of course it is also possible to provide, on the same high-voltage electrode arrangement, different holding devices for holding the electrode tips when a multiplicity of electrodes are present. In particular it is possible to combine the above-mentioned specific embodiments of the holding devices, that is to say magnetic holding devices, coupling devices and adhesion holding devices, so as to provide an option for locking the electrode tips which is improved further still. With a multiplicity of electrodes, it is also possible to provide holding devices for the electrode tips not on each electrode, but for example intermittently just on every second electrode or the like. Of course, in such a case it must then be ensured that contact is made in an ulterior manner in those electrode tips where a combined holding and contact-making device is not provided on the electrode or electrode body thereof. It is also possible to form the at least one holding device directly on the electrode body, in any specific embodiment, and to make the electrode body accessible from the end face of the high-voltage electrode arrangement.
In addition to the adhesion or else alternatively thereto, the insulating material, in particular the ribbon, can be provided with an adhesive and an adhesive bond can thus be created.
Three preferred exemplary embodiments of the high- voltage electrode arrangement according to the invention will be explained in greater detail hereinafter on the basis of a drawing.
In the drawings :
Figure 1 shows a perspective obligue view of the high- voltage electrode arrangement according to the invention; Figure 2 shows a sectional view on the narrow side of the high-voltage electrode arrangement from figure 1 with a holding device in accordance with a first exemplary embodiment; Figure 3 shows a sectional view on the narrow side of the high-voltage electrode arrangement according to figure 1 with a holding device in accordance with a second exemplary embodiment; and
Figure 4 shows a sectional view on the narrow side of the high-voltage electrode arrangement from figure 1 with a holding device in accordance with a third exemplary embodiment.
Figure 1 shows a perspective obligue view of a high- voltage electrode arrangement 100 according to the invention which is arranged in front of an object to be charged or discharged, in the example shown in accordance with figure 1 a material web 101. The high- voltage electrode arrangement 100 has a housing 10, which in the example shown has an end face 11 of rectangular area and accordingly four side walls 12 adjacent thereto. The side walls 12 of the housing 10 are normally made of metal and are earthed. According to figure 1, a multiplicity of electrode tips 22 are arranged in the area of the end face 11 and are electrically connected to electrode bodies 21 arranged inside the housing 10. The electrode tips 22 protrude just slightly beyond the end face 11 of the housing 10, as shown in figure 1; however, it is also possible to arrange the electrode tips 22 such that they protrude from the housing 10 to a greater or lesser extent accordingly. Each electrode tip 22 forms an electrode 20 together with its respective electrode body 21. For the sake of clarity, only one electrode body 21 is shown in figure 1, wherein this electrode body 21 is of course arranged inside the housing 10. The other electrode tips 22 in figure 1 are also connected to a similar electrode body 21, covered by one of the side walls 12, and thus form an electrode 20 in each case. An insulating material 30 is provided in the area between the electrode tips 22 and the respective electrode bodies 21 and is formed as a ribbon 31 in the example shown in figure 1 and substantially completely surrounds the electrode tips 22 and electrode bodies 21 in the vicinity of the connection therebetween. Due to the ribbon 31 made of insulating material 30, which lies substantially completely tightly against the end face 11 in the example shown in accordance with figure 1, it is ensured that, during operation of the high- voltage electrode arrangement 100, that is to say when a high voltage of a number of kilovolts is applied to the electrodes, pollution settles on the ribbon 31, above all in the area between the electrode tips 22, where it can be removed more easily than if it were to settle directly on the end face 11 in the area between the electrode tips 22.
The insulating material 30 formed as a ribbon 31 according to the example in figure 1 consists of polyurethane and is only a few millimeters thick so that it is very flexible and, due to the adhesion provided by the material, sticks adhesively to the end face 11, which is smooth in the example shown in accordance with figure 1. It is thus ensured, as a result of the tightness thus produced in the area of the ribbon, that conductive pollution such as ink or the like does not infiltrate the area between the ribbon 31 and the end face 11, but settles exclusively on the ribbon 31. As can be seen from the sectional view on the narrow side of the high-voltage electrode arrangement 100 in accordance with figure 2, at least one electrode body 21 is embedded in the housing 10, wherein the electrode body 21 is formed as a resistor 25 in all three exemplary embodiments shown in accordance with figures 2 to 4. The electrode body 21 of the at least one electrode 20 is held in position by means of an embedding compound 26, which fills the interior of the housing 10. In the first exemplary embodiment shown in accordance with figure 2, a holding device 40 for holding an electrode tip 22 is provided in the area of the end face of the electrode body 21 and is formed as a coupling device 40b in the first exemplary embodiment shown. The coupling device 40b cooperates with a coupling area 24 of the electrode tip 22 so that the electrode tip 22 is held in position by means of the holding device 40 formed as a coupling device 40b. The actual effective area of the electrode tip 22 protrudes beyond the end face 11 of the high-voltage electrode arrangement 100 in the exemplary embodiment shown, whilst the coupling area 24 of the electrode tip passes through the end face 11 in the exemplary embodiment shown and is received in the housing interior. An insulating material 30 is provided in this coupling area, that is to say in the transition area between the effective area of the electrode tip 22 and the electrode body 21, and is again formed as a ribbon 31 made of insulating material 30. In the exemplary embodiment shown in accordance with figure 2, the ribbon 31 covers the end face 11 completely and lies tightly against the end face 11.
In the first exemplary embodiment shown, the ribbon 31 is connected rigidly to the electrode tip 22 in the area between the effective area 28 of the electrode tip 22 and the coupling area 24 of the electrode tip 22. In other words, the electrode tip 22 pierces the ribbon 31 so that the ribbon 31 tightly surrounds the transition area between the effective area 28 and the coupling area 24 of the electrode tip 22. It is thus ensured that, due to the tightness thus produced, pollution can only deposit on the ribbon 31 and not in the area of the end face 11 arranged below.
In accordance with the first exemplary embodiment shown, the coupling area 40b is also formed such that it allows the electrode tip 22 to be removed, that is to say replaced. Since the electrode tip 22 is connected rigidly and tightly to the ribbon 31, and since a multiplicity of electrode tips 22 are mechanically interconnected by means of the ribbon 31, it is particularly easy to replace the electrode tips 22 by simply removing the ribbon 31 together with the electrode tips 22 once the coupling devices 40b have been released. The deposited pollution in particular in the area between the electrode tips 22 is then removed when the electrode tips 22 are changed together with the ribbon 31 made of insulating material 30 and, depending on the nature and type of pollution, the electrode tips are either cleaned together with the ribbon 31 or are replaced completely.
Figure 3 likewise shows a sectional view on the narrow side of the high-voltage electrode arrangement 100 according to figure 1, wherein, in this second exemplary embodiment in accordance with figure 3, compared to the first exemplary embodiment shown in figure 2, the holding device 40 is now formed as a magnetic holding device 40a in the electrode body 21 formed as a resistor 25. A magnet area 23 is accordingly provided on the electrode tip 22 so that, similarly to the first exemplary embodiment, the inserted electrode tip 22 is held in position by means of magnet force, that is to say by magnetic contact between the magnet area 23 of the electrode tip 22 and the magnetic holding device 40a. Also in accordance with this second exemplary embodiment illustrated in figure 3, the insulating material 30 is in the form of a ribbon 31, wherein the at least one electrode tip 22 is again embedded in the ribbon 31 in a tightly surrounded manner such that the magnet area 23 is arranged on one side of the ribbon 31 and the effective area 28 of the electrode tip 22 is arranged on the other side of the ribbon 31.
In this case too, it is very easy to exchange the ribbon 31 made of insulating material together with the electrode tips 22 by overcoming the magnetic adhering effect between the magnetic holding device 40a and the magnet area 23 when detaching the ribbon 31 together with the electrode tips 22. Figure 4 again shows a sectional view on the narrow side of the high-voltage electrode arrangement 100 according to the invention. According to the third exemplary embodiment shown in accordance with figure 4, the insulating material 30 is formed as a ribbon 31 protruding far beyond the side walls 12 of the housing 10 and which can be placed or folded over the edges of the housing due to its flexibility so that it lies substantially completely against the end face 11 and the side walls 12. In the third exemplary embodiment shown, an adhesion holding device 40c is provided for particularly close contact between the ribbon 31 and the housing structures and, for example, can be provided in the form of particularly smooth housing parts, for example particularly smooth side walls 12. Due to the adhesive effect of the ribbon 31 in the event of contact with an adhesion holding device 40c of this type, it is thus again possible to lock the at least one electrode tip 22, which is embedded in the ribbon 31 similarly to the exemplary embodiments from figures 2 and 3, that is to say to hold it in position with respect to the housing 10.
In this case, the electrode tip 22 is contacted with the electrode body 21 associated therewith by a spring contact 27 which is provided on the electrode body and which produces electric contact with a contact area 29 of the electrode tip 22 by means of spring force. Of course, it is just as egually possible, conversely, to provide a spring contact on the electrode tip 22 and a corresponding counter contact area on the electrode body 21. Also according to the third exemplary embodiment shown in figure 4, it is thus possible to easily exchange the ribbon 31 made of insulating material 30 together with the electrode tips 22 embedded in said ribbon, in particular if pollution is present in the area between the electrode tips 22 or in the area surrounding the at least one electrode tip 22 as far as the side walls 12 of the housing 10 partially covered by the ribbon 31.
It should be noted at this juncture that a resistor 25 in particular does not necessarily have to be provided. In this case, the electrode body 21 is coupled directly to the high-voltage source. The electrode tip 22 and the electrode body 21 can also be provided as a single unit so that this unit is connected directly to the high-voltage source, that is to say without a resistor 25. Of course, the same advantages are also provided for such arrangements formed of a unit of an electrode body 21 with an electrode tip 22 without resistor coupling if, in accordance with the invention, an insulating material 30, preferably a ribbon 31, is provided in an area between the electrode tip 22 and the electrode body 21 of the unit.
It should be noted that all of the above-described parts and in particular the details illustrated in the figures are claimed as being essential to the invention, whether considered individually per se or in any combination. A person skilled in the art will be familiar with modifications thereto.
List of reference signs
10 housing
11 end face
12 side wall
20 electrode
21 electrode body
22 electrode tip
23 magnet area
24 coupling area
25 resistor
26 embedding compound
27 spring contact
28 effective area of the electrode tip
29 contact area
30 insulating material
31 ribbon
40 holding device
41 contact-making device
40a magnetic holding device
40b coupling device
40c adhesion holding device
100 high-voltage electrode arrangement
101 material web

Claims

Patent Claims
1. A high-voltage electrode arrangement (100) for charging or discharging an object, in particular a moving material web, wherein the high-voltage electrode arrangement (100) has the following:
- a housing (10) with an end face (11) and at least one side wall (12) which is adjacent to the end face ( 11 ) ;
- at least one electrode (20), which has an electrode body (21) and an electrode tip (22), wherein the at least one electrode (20) is arranged such that the electrode tip (22) acts on the end face (12) at least partially outside the housing (10) of the high-voltage electrode arrangement (100),
wherein the at least one electrode (20) is completely surrounded by a replaceable insulating material (30) in the area between the electrode tip (22) and the electrode body (21), and wherein the replaceable insulating material (30) is arranged outside the housing (10) of the high-voltage electrode arrangement (100) .
2. The high-voltage electrode arrangement (100) as claimed in claim 1,
wherein the replaceable insulating material (30) at least partially covers the end face (11) and/or the at least one side wall (12) of the housing (10) .
3. The high-voltage electrode arrangement (100) as claimed in claim 1 or 2,
wherein the replaceable insulating material (30) is provided in the form of a ribbon (31), preferably a flexible plastic ribbon.
4. The high-voltage electrode arrangement (100) as claimed in claim 3, wherein a multiplicity of electrodes (20) are provided, and wherein the electrodes (20) are surrounded by the same ribbon (31), preferably by an integrally formed ribbon of insulating material, in the area between the electrode tip (22) and the electrode body (21) .
5. The high-voltage electrode arrangement (100) as claimed in one of claims 1 to 4,
wherein the replaceable insulating material (30) is an adhesive plastic material, preferably polyurethane or silicone .
6. The high-voltage electrode arrangement (100) as claimed in one of claims 1 to 5,
wherein the replaceable insulating material (30) adheres at least partially to the end face (11) and/or to the at least one side wall (12) of the housing (12), by adhesion.
7. The high-voltage electrode arrangement (100) as claimed in one of claims 1 to 6,
wherein the electrode tip (22) of the at least one electrode (20) can be removed from the electrode body (21) .
8. The high-voltage electrode arrangement (100) as claimed in claim 7,
wherein the replaceable insulating material (30) and the electrode tip (22) of the at least one electrode (20) can be removed together.
9. The high-voltage electrode arrangement (100) as claimed in claim 7 or 8,
wherein the high-voltage electrode arrangement (100) furthermore has at least one holding device (40) for holding at least the removable electrode tip (22) of the at least one electrode (20).
10. The high-voltage electrode arrangement (100) as claimed in claim 9,
wherein a contact-making device (41) is additionally formed on the at least one holding device (40), and wherein the contact-making device (41) makes an electrical contact between the electrode body (21) of the at least one electrode (20) and the removable electrode tip (22).
11. The high-voltage electrode arrangement (100) as claimed in claim 9 or 10,
wherein the at least one holding device (40) is a magnetic holding device (40a), and wherein the removable electrode tip (22) of the at least one electrode (20) has a magnet area (23), such that the electrode tip (22) is held by magnetic force in the holding device (40) .
12. The high-voltage electrode arrangement (100) as claimed in claim 11,
wherein the magnet area (23) of the electrode tip (22) of the at least one electrode (20) makes an electrical contact by means of the contact-making device (41) between the electrode tip (22) and the electrode body (21) .
13. The high-voltage electrode arrangement (100) as claimed in claim 9 or 10,
wherein the at least one holding device (40) is a coupling device (40b), and wherein the removable electrode tip (22) of the at least one electrode (20) has a coupling area (24), such that the electrode tip (22) is mechanically held in the holding device (40) .
14. The high-voltage electrode arrangement (100) as claimed in claim 13,
wherein the coupling area (24) of the electrode tip (22) of the at least one electrode (20) makes an electrical contact by means of the contact-making device (41) between the electrode tip (22) and the electrode body (21).
15. The high-voltage electrode arrangement (100) as claimed in claim 9 or 10,
wherein the at least one holding device (40) is an adhesion holding device (40c), and wherein the removable electrode tip (22) of the at least one electrode (20) is connected to the replaceable insulating material (30) such that the insulating material (30) adhesively holds the electrode tip (22) in position on the at least one adhesion holding device (40c) .
16. The high-voltage electrode arrangement (100) as claimed in to one of claims 1 to 15,
wherein the end face (11) and/or the at least one side wall (12) of the housing (10) are/is essentially smooth .
17. The high-voltage electrode arrangement (100) as claimed in to one of claims 1 to 16,
wherein the thickness of the replaceable insulating material (30), in particular of the ribbon (31), is between 0.5 and 5 mm.
EP12721379.1A 2011-04-29 2012-04-27 High-voltage electrode arrangement Not-in-force EP2702653B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110017796 DE102011017796B4 (en) 2011-04-29 2011-04-29 High-voltage electrode arrangement
PCT/US2012/035415 WO2012149290A1 (en) 2011-04-29 2012-04-27 High-voltage electrode arrangement

Publications (2)

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EP2702653A1 true EP2702653A1 (en) 2014-03-05
EP2702653B1 EP2702653B1 (en) 2015-03-18

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WO (1) WO2012149290A1 (en)

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EP2775577B1 (en) * 2013-03-04 2017-02-01 Illinois Tool Works Inc. Ionization apparatus
DE102019112335B4 (en) * 2019-05-10 2022-12-22 Gema Switzerland Gmbh Ionization device with a high voltage resistance arrangement

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US3875461A (en) * 1973-09-18 1975-04-01 Harris Intertype Corp Static eliminator
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Also Published As

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DE102011017796A1 (en) 2012-10-31
EP2702653B1 (en) 2015-03-18
DE102011017796B4 (en) 2014-02-06

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