DE102009055220A1 - Device for connecting multi-layered and/or mineral-insulated and/or coaxial resistance heat conductor to positive temperature coefficient resistor, has closure device for closing opening of cylindrical receiving/connecting receptacle - Google Patents

Abstract

The device (100) has a cylindrical receiving/connecting receptacle (10) for receiving a two-component sealing compound (20) and for connecting an end portion (11a) of a multi-layered and/or mineral-insulated and/or coaxial resistance heat conductor to a positive temperature coefficient resistor (12). The sealing compound is filled in an opening (102) formed in the receptacle, where the end portion of the heat conductor is inserted into the receptacle through the opening. A closure device closes the opening of the receptacle. A sealant seals a passage arrangement of the closure device. An independent claim is also included for a method for connecting a multi-layered and/or mineral-insulated and/or coaxial resistance heat conductor to an electrical supply.

Description

The invention relates to a connection device for connecting a, in particular multi-layered and / or mineral-insulated and / or coaxial, Widerstandsheizleiters to an electrical supply.

The term "heating resistor" is generally understood to mean an electrical component that converts electrical energy into thermal energy (heat). Such a heating resistor regularly comprises a resistance heating conductor comprising an electrically conductive material of relatively high electrical resistance, through which current flows and thereby heats up.

The present invention generally relates to resistance heating conductors or lines of various known types. For example, the resistance heating conductor may be in the form of a single heating wire, a heating coil, a heating tape, a heating jacket, a heating register, etc.

The resistance heating conductor generally has two end sections and can be connected to an electrical supply, for example a power supply, at one end or at both ends. The concrete conductor of the electrical supply to which the resistance heating conductor is connected is normally designed as a PTC thermistor.

Particularly in the case of multilayered and / or mineral-insulated and / or coaxial resistance heating conductors, a receiving / connecting container is frequently provided for producing the connection of the resistance heating conductor to the electrical supply. Such multilayer Widerstandsheizleiter consist of two or more, in particular coaxially arranged layers, wherein the core is often formed of a conductive material and one of the other, the core sheathing layers comprises an insulating material. Frequently, such resistance heating conductors have a further, third, the Widerstandsheizleiter outwardly final coat, which may for example consist of stainless steel. For example, in the so-called mineral-insulated heating conductors, a conductive core, for example of stainless steel, is usually provided, which is encased by an insulating material, which often comprises magnesium oxide. The end of the mineral-insulated heating conductor forms a (stainless steel) outer jacket. Furthermore, alternative multilayer Widerstandsheizleiter are known in which instead of a mineral insulation, a plastic insulation, such as PTFE, is provided.

Such resistance heating conductors are used in particular in the high temperature range, for example for operating temperatures up to 500 ° C. Alternatively or in addition to the high temperature range, such resistance heating conductors are also used in potentially explosive areas, for example in gas delivery pipelines, such as propane pipelines. In this regard, various legal guidelines, which prescribe a particular embodiment of the resistance heating and its connection to an electrical supply in hazardous areas relevant (for example Directive 94/9 EC ).

Thus, in particular with mineral-insulated or other multilayer and / or coaxial resistance heating conductors, the connection is made to an electrical supply within a connection device, which generally has a receiving / connecting container into which both the electrical supply and at least one end portion of the Widerstandsheizleiters, with the electrical supply is to be connected, are insertable. Within this receptacle / connection container, the electrical connection, in particular by means of suitable connection means, made between Widerstandsheizleiter and electrical supply. The at least one end portion of a multilayer Widerstandsheizleiters may in principle be in normal, multi-layered form as well as in stripped form, in the latter case often only the central, conductive core will be present and the outer shells are made of insulating material or stainless steel.

In order to reduce the risk of explosion through the connection between the electrical supply and resistance heating conductor and to ensure the applicability in a high temperature range, it is known to fill in the receiving / connecting container a flowable sealant which cures after a certain time, and the junction between resistance heating and electrical supply within the receiving / connection container (tight) encloses. For this purpose, the known receiving / connecting container to an opening through which filled the sealant in the container and through which also the at least one end portion of the Widerstandsheizleiters can be introduced.

In the case of known connection devices, the problem arose in the past that the maximum use temperature of the resistance heating conductor or its heating power was limited to undesirably low values by the connection device and the connection device frequently could not be used quickly enough after the filling of the sealing compound.

Accordingly, the present invention has the object to improve the usability of the connection device or spread to a wider field of application.

The above object is achieved by a connection device having the features of claim 1.

Thereafter, the receiving / connecting container of the connecting device has a closure device which is provided for closing that opening of the receiving / connecting container through which the at least one end portion of the resistance heating conductor is inserted into the receiving / connecting container and through which the sealing compound in the receiving / Connecting tank is filled. This is one and the same opening. In the connection devices known from the prior art, the opening for filling the sealant and for introducing the at least one end portion of the Widerstandsheizleiters is unlocked. In this case, both the PTC of the electrical supply and the at least one end portion of the Widerstandsheizleiters must be inserted into the receiving / connecting container and connected to each other within the same. In a second step, the connection device, also called "connection fitting", held by a person mounting so that the opening through which the sealing or potting compound is to be introduced into the interior of the container, pointing upwards. Thus, for example, in the case of cylinder-shaped or parallelepiped-shaped receiving / connecting containers, the openings will often be provided on one of the end faces, so that such receiving / connecting containers for filling the sealing compound are to be brought into a vertical position. Thereafter, the sealant is to be provided by an assembler. Typical and known sealants are so-called "two-component sealants" in which two components must be mixed or stirred together by an assembler to produce the final sealant. The sealant thus produced is now filled or poured by the assembler through the opening in the receiving / connecting container. After filling the sealant or mixing the components of the sealant, it takes many minutes or even hours in known from the prior art sealing compounds until the viscosity of the sealant increases significantly. Thus, the connection device must remain in the (vertical) position with the opening upwards for the entire aforementioned period, in order to prevent leakage of the sealant and to ensure a safe enclosure of the junction of the Widerstandsheizleiters and the electrical supply.

In contrast, in the connection device according to the invention after filling the sealant, the opening through which both the sealant filled and the at least one end portion of the Widerstandsheizleiters is inserted into the receiving / connecting container, are closed. Thus, the connecting device can be mounted immediately after filling and closing and thus before the curing of the sealant or brought into a different position. The assemblers can thus easily continue their work after filling and do not wait until the curing of the sealant.

The receiving / connecting container can in principle be formed by any suitable container or hollow body, which is designed for a permanent absorption of the sealing compound and insertion of the at least one end portion of the Widerstandsheizleiters and the electrical supply. The inner or cavity of the receiving / connecting container should be sized so that there is sufficient space for connecting the at least one end portion of the Widerstandsheizleiters with the electrical supply and at the same time sufficient sealant can be added.

Preferred embodiments of the invention are characterized in the subclaims.

Conveniently, the closure device is designed such that it seals the opening of the receiving / connecting container in such a way that the (entire) sealant, even in the not yet hardened state, in any case remains in the container. In other words, the closure device is designed to prevent leakage of the sealant from the receiving / connecting container. Thus, the closure device has a tightness which, depending on the viscosity of the sealant in the unbonded state, directly after mixing or producing the sealant is. In other words, the tightness of the closure device is advantageously matched to the viscosity of the sealant in the unbonded state, so that it is always ensured that leakage of the sealant is prevented.

In a preferred embodiment, the closure device has a passage arrangement for passing the at least one end section of the resistance heating conductor through the closure device into the receiving / connecting container. The sealant is normally filled in the unlocked state of the receiving / connecting container through the opening in its interior. After filling, the Receiving / connecting container closed by the closure device. Furthermore, since it must be ensured, even in the closed state, that the at least one end section of the resistance heating conductor can be introduced through the opening into the receiving / connecting container, it is advantageous to provide the passage arrangement according to the invention. This ensures that an insertion of the at least one end portion of the Widerstandsheizleiters and thus its connection to the electrical supply is ensured. For this purpose, the passage arrangement comprises a passage through the closure device.

Conveniently, the passage arrangement is designed such that, although it allows the at least one end portion of the resistance heating conductor to enter the receiving / connecting container, no sealing compound can run out of the receiving / connecting container. For this purpose, sealing means are advantageously provided which seal the passage arrangement such that leakage of the sealing compound is prevented, wherein the sealing means at the same time do not hinder the insertion of the at least one end portion of the Widerstandsheizleiters in the receiving / connecting container through the passage arrangement. The sealing means may in principle have any suitable shape and material. For example, they can be made of silicone, rubber or other plastics. In particular, they may be formed as sleeves of one of the aforementioned or other materials, which are formed for encompassing or enclosing the at least one end portion of the Widerstandsheizleiters.

Expediently, the passage arrangement has at least one, preferably two, bores through the closure device. The size of the throughbore is to be dimensioned so that the at least one end portion of the resistance heating conductor, in particular accurately fitting, can be performed. The diameter of the perforation can also be made slightly larger than the diameter of the at least one end portion of the Widerstandsheizleiters to allow room for a between the through hole and at least one end portion to be arranged sealant, such as a silicone sleeve o. The like. At the same time results from the provision of the sealant the advantage that different thickness Widerstandsheizleiter can be adjusted by different strong sealant to the through holes. The sealing means act insofar as a kind of adapter and a through hole can be used for different sized end portions of Widerstandsheizleitern, which simplifies the structure of the connection device as a whole. Two through holes are provided in particular when both end portions of the resistance heating conductor are inserted into the receiving / connecting container.

Furthermore, it is preferred in this embodiment that the at least one through-hole is arranged at a predetermined distance from the edge of the receiving / connecting container and / or to a further through-bore. The end portions of the resistance heating conductors are normally formed as rectilinear rods or wires. In this respect, it is advantageous to position the at least one through-bore in the closure device in such a way that it lies flush with or congruently above a connection point in the interior of the receptacle / connection container to which the at least one end section of the resistance heating conductor is to be connected to the electrical supply , For example, this may be a terminal location of a connection means, in particular a terminal block. By the aligned arrangement of connection point and through hole is achieved that the at least one end portion of the Widerstandsheizleiters can be performed in a straight line from the through hole to the connection point and does not have to be bent within the receiving / connecting container o. The like. Also, it could otherwise lead to tensions in the end come the resistance heating, which were transmitted to the end portion surrounded sealant and could cause damage here. If both end portions are guided into the receiving / connecting container, it is also expedient to dimension the distance between the two through holes of the respective end sections such that they correspond to the distance between the two connection points within the receiving / connecting container, so that here too an aligned Arrangement achieved and bending or damaging the end portions of the Widerstandheizleiters is prevented.

Conveniently, an electrical connection means is provided which electrically connects the at least one end portion of the Widerstandsheizleiters with an electrical supply and is disposed within the receiving / connecting container. The passage arrangement is advantageously assigned to the connection device in such a way that the at least one end section guided through the passage arrangement can be inserted substantially accurately into the connection device, in particular without bending or otherwise manipulating the end section of the resistance heating conductor. This ensures that the specified creepage and clearance distances are safely adhered to, without the need for a final control. In particular, such a tailor-made training by a flush arrangement the passage arrangement with respect to the connecting device achieved.

In a further preferred embodiment, the closure device comprises a covering means, which is designed to cover the opening of the receiving / connecting container. The dimensions of the covering means preferably correspond substantially to the inner circumference or the outer circumference of the receiving / connecting container, in particular in the region of the opening. This ensures that leakage of the sealant is reliably avoided. Particularly preferably, the covering means is designed as a cover, as this can be made in a particularly easy manner to produce a secure covering the opening of the receiving / connecting container. Advantageously, the cover is arranged axially displaceable with respect to the longitudinal axis of the receiving / connecting container.

In a further preferred embodiment, the closure device has fastening means for fastening the closure device to the receiving / connecting container, in particular in the region of the opening of the receiving / connecting container. By the fastening means it is achieved that the closure device is securely held in its intended place and the risk that still uncured sealant can leak is further reduced.

In principle, any suitable fastening means known from the prior art can be used. The fastening means preferably comprises a screw connection between the closure device and the receiving / connecting container with a screwing means, in particular an end nut. Conveniently, in such embodiments, the receiving / connecting container is cylindrical. The end nut preferably sits on the receiving / connecting container from the outside and closes off the closure device to the outside.

Furthermore, it is expedient that the screwing means has a passage opening which is formed to the passage of the at least one end portion, in particular for the passage of two end portions of the Widerstandsheizleiters. In particular, this passage opening may be part of the passage arrangement described above. If both a screwing means and a covering means are provided, a passage opening or a throughbore or the like is expediently provided in each of the two means, so that the at least one end section can be passed through the entire closure device. Furthermore, in this case, fastening means and covering means are associated with one another in such a way that the fastening means holds or fixes the covering means in the receiving / connecting container. In particular, the covering means is expediently arranged between the fastening means and the sealing compound. In particular, the covering can be arranged directly adjacent to the sealant, but preferably a certain distance is maintained, if the sealant, for example by temperature change, changes in volume.

• a.) Vorsehen eines Aufnahme-/Anschlussbehälter,
• b.) Einführen einer elektrischen Versorgung in den Aufnahme-/Anschlussbehälter,
• c.) Vorsehen eines Befestigungsmittels, insbesondere einer Abschlussmutter, mit einer Durchlassöffnung und Durchführen des mindestens einen Endabschnittes des Widerstandsheizleiters durch die Durchlassöffnung,
• d.) Vorsehen eines Abdeckmittels, insbesondere Abdeckscheibe, mit mindestens einer Durchbohrung und Einführen des mindestens einen Endabschnittes des Widerstandsheizleiters durch die mindestens eine Durchbohrung,
• e.) Anschluss des mindestens einen Endabschnittes des Widerstandsheizleiters an die elektrische Versorgung innerhalb des Aufnahme-/Anschlussbehälters, bevorzugt mittels einer elektrischen Verbindungseinrichtung, insbesondere Klemmkörper,
• f.) Einfüllen einer Dichtmasse in den Aufnahme-/Anschlussbehälter, und
• g.) Befestigen des Befestigungsmittels am Aufnahme-/Anschlussbehälter.

Furthermore, the object on which the invention is based is achieved by a method for connecting a, in particular multi-layered and / or mineral-insulated and / or coaxial, resistance heating conductor to an electrical supply, which comprises the following steps:

• a.) Provision of a receiving / connecting container,
• b.) introducing an electrical supply into the receiving / connecting container,
• c.) providing a fastening means, in particular a closing nut, with a passage opening and passing the at least one end section of the resistance heating conductor through the passage opening,
• d.) Provision of a covering means, in particular cover disc, with at least one through-bore and insertion of the at least one end portion of the resistance heating conductor through the at least one through-bore,
• e.) connecting the at least one end section of the resistance heating conductor to the electrical supply within the receiving / connecting container, preferably by means of an electrical connecting device, in particular clamping body,
• f.) filling a sealant in the receiving / connecting container, and
• g.) Attaching the fastener to the receptacle / connection box.

Thus, according to the method, an electrical supply is first introduced into the receiving / connecting container and preferably connected to a connecting device. In a next step, the at least one end portion of the resistance heating conductor is guided through the passage opening of the fastening means. Thereafter, the at least one end portion is passed through the at least one through hole of the cover means and introduced with its guided through both the attachment as well as by the cover means end portion in the receiving / connecting container. There it is effectively connected by means of the connecting device with the electrical supply. In a further step, the sealing compound is filled into the opening of the receiving / connecting container and the opening is then closed with the fastening means. Conveniently, the fastening means fixes or holds the covering means such that the filled-in sealing compound can no longer leak. The through-hole and the passage opening together form a passage arrangement through the closure device, which in turn consists of the fastening means and the covering means. The inventive method is therefore achieved that a Widerstandsheizleiter can be connected in a simple yet secure way to an electrical supply and the Widerstandsheizleiter can be used immediately after the connection or brought into its intended position without any setting or curing of Must wait sealing compound.

In the method described above, steps a.) To g.) Are preferably carried out in chronological chronological order, with steps a.) And b.) After steps c.) And d.) Or e.) And Step e.) Could also be performed by the steps a.), B.) Or c.).

In a preferred embodiment of the method, a sealing means is inserted into the at least one through-bore of the covering means. This step is preferably carried out before the aforementioned step d.). The sealing means may in particular be designed as a sleeve or the like, which engages in the throughbore, in particular by means of a groove, with the outer jacket contacting the sleeve with the inner edge of the throughbore. The at least one end portion of the Widerstandsheizleiters is then passed through the inner cavity of the sleeve and abuts against the inner shell. Accordingly, the diameter of the inner jacket of the sleeve is to be adapted to the outer diameter of the Widerstandsheizleiters or the end portion of the Widerstandsheizleiters.

Furthermore, the object underlying the invention is achieved by a connecting device for connecting a, in particular multi-layered and / or mineral-insulated and / or coaxial Widerstandsheizleiters to an electrical supply to a receiving / connecting container for receiving a sealant and the at least one end portion of the Widerstandsheizleiters at the sealing compound has a high thermal conductivity, the thermal conductivity being in particular at least 0.61 W / mK, preferably at least 0.91 W / mK, particularly preferably at least 1.21 W / mK.

In connection devices known from the prior art, hitherto sealing compounds have been used which have a high electrical insulation strength. These known sealing compounds for connection devices are at the same time also highly thermally insulating and have low thermal conductivities, in particular of 0.4 W / mK or less. As a result of this forced coupling of thermal and electrical insulation resistance, very high temperatures are produced in the hardened sealing compound in known connection devices, which clearly limits the maximum connectable heating power, for example to a maximum of 20 W / m heating conductor.

In order to improve the heating power of the Widerstandsheizleiters and thus to expand its application, now with the present invention the first step dared to provide connection devices with sealants having a high thermal conductivity of at least 0.61 W / mK, preferably at least 0.91 W. / mK, more preferably at least -1.21 W / mK. By the connecting device according to the invention and the sealing compound contained therein with high thermal conductivity is achieved that the heat of the Widerstandsheizleiters can be derived within the receiving / connecting container on the outer surface. Thus, the temperature in the sealant is significantly lowered even at high, length-specific performance of the resistance heating, whereby the heating power can be increased overall.

Expediently, the sealing compound furthermore has a high electrical insulation capability, which is in particular at least 500 V / mm, preferably at least 1000 V / mm, particularly preferably at least 1500 V / mm. This also ensures that the connection device is safe to use and also complies with statutory regulations or standards. This coupling of high thermal and electrical conductivity in a single sealant in a connection device has hitherto not been known in the prior art and has not been thought possible. Instead, in conventional connecting devices with sealing compounds having a relatively high electrical insulation strength and relatively low thermal conductivity, attempts have only been made to increase the heating power through the addition of additives, such as quartz or the like, which only marginally increases the actual thermal conductivity of the sealing compound ,

In a preferred embodiment, the sealant is formed such that its maximum temperature resistance is at least 120 ° C, preferably at least 140 ° C, more preferably at least 160 ° C. This makes it possible to safely use the connection device in high temperature areas and hazardous areas.

Advantageously, the sealant has a pot life of less than or equal to 45 minutes, preferably less than or equal to 35 minutes, especially preferably less than or equal to 30 minutes, at room temperature. In general, the term "pot life" is understood to mean the processing time of reactive materials. It is commonly called "service life". For example, in the case of a sealing compound of a connecting device designed as a two-component sealing compound, the two individual components are brought together by an assembly person and mixed with one another. After mixing, the actual sealant is produced, which still has a relatively low viscosity, but which increases drastically at the end of the pot life (the sealant cures). In conventional sealants, the pot life is significantly higher, which is unfavorable insofar as that after potting the sealant in the receiving / connecting container this must be kept in a position in which the sealant does not leak. The assembler can therefore not continue with their work for a relatively long period of time, but must interrupt it. By the sealing compound according to the invention, this interruption period is significantly reduced.

In a connection device produced by way of example by the Applicant, the sealant has a thermal conductivity of about 1.8 W / mK, an electrical insulation strength of greater than 1500 V / mm, a maximum temperature resistance of at least 210 ° C and a pot life of about 20 minutes at room temperature. The specified insulation resistance is for a temperature range of -40 ° C to 140 ° C. Suitable sealants can be prepared, for example, based on resins or casting resins.

In the following, the invention will be explained in more detail by an exemplary embodiment shown in the drawing. They show schematically:

1 a perspective view of a connection device with connected Widerstandheizleiterschleife and connected PTC thermistor,

2 a sectional view of a connecting device with connecting means and inserted end portion of a Widerstandsheizleiters when filling a sealant,

3 the view 2 with a closure device in the non-closed state and filled sealant,

4 the picture off 3 with sealed receptacle / connection container,

5 3 a sectional view of a closure device with resistance heating conductor loop passed through,

6 a top view of a cover with sealing sleeves,

7a a cross section through the cover without sealing sleeves,

7b a longitudinal section through the cover 7a , and

8th a sectional view of a connecting device with Widerstandsheizleiterschleife when heating a medium.

1 shows a perspective view of a connection device 100 , which has a cylindrical receiving / connecting container 10 includes. In its upper frontal area 101 has the receiving / connecting container 10 a circular opening 102 on. The opening 102 is coaxial with the longitudinal axis of the receiving / connecting container 10 arranged. In the opening 102 is a closure device 30 used, within which a passage arrangement 40 is provided. Further, a resistance heating conductor 11 shown, the two end sections 11a . 11b includes, both through the passage arrangement 40 and the opening 102 in the receiving / connecting container 10 are introduced. The end sections 11a . 11b are each substantially rectilinear with a circular cross-section and therefore formed rod-shaped and parallel to each other from the receiving / connecting container 10 out and go in straight line, outside the receptacle / outlet tank 10 lying sections of the Widerstandsheizleiters 11 over, finally in a loop 110 merged, which describes a 180 ° bend. Through the lower front side area 104 of the receptacle / connection container 10 becomes a PTC thermistor 12 an electrical supply in the receiving / connecting container 10 introduced. The PTC thermistor 12 can for example consist of a standard, three-wire connection cable with, for example, 1.5 mm ² cross-section, which is commonly provided with an insulation made of silicone or PTFE. On the lower front side area 104 of the receiving / connecting tank 10 is a cylindrical, smaller diameter than the receiving / connecting container 10 having mounting module 13 placed. In this assembly module 13 becomes the PTC thermistor 12 one and then passed into the receiving / connecting container 10 , Furthermore, the mounting module takes 13 Cable glands and a plastic block 14 on.

2 shows a side view of a connection device 100 , wherein the receiving / connecting container 10 is cut open. The PTC thermistor 12 is through the mounting module 13 through to the inside of the receptacle / connection container 10 towards the plastic block 14 guided. Furthermore, inside the receiving / connecting container 10 one as a connection device 15 trained clamping body provided. Between clamp body 15 and plastic block 14 is a connector 16 provided with an electrical conductor. Furthermore, the end section 11a a resistance heating conductor 11 shown in the receptacle / connection box 10 through an opening 102 is introduced and at a connection point 151 in the clamp body 15 is attached. Thus, the resistance heating conductor and the PTC thermistor become 12 in the clamp body 15 electrically connected to each other. In the upper, the opening 102 facing portion of the inner shell of the receiving / connecting container 10 is a circumferentially trained thread 105 intended. The end section 11a is at the connection point 151 in the clamp body 15 introduced and firmly connected there. Furthermore, in the 2 shown that a sealant 20 through the opening 102 in the interior 106 of the receiving / connecting tank 10 is filled. There is always so much sealant 20 in the interior 106 filled in that the entire clamp body 15 with sealant 20 is sheathed. In practice, assemblers become a predetermined amount of sealant 20 or sealing compound components supplied, so that always the exact prescribed amount of sealant 20 in the interior 106 is filled.

3 shows a representation which is similar to that 2 , After casting the sealant 20 in the presentation of the 2 will now additionally a closure device 30 provided, which is a covering 31 in the form of a cover and a fastener 32 in the form of a knurled nut. The closure device 30 further comprises a passage arrangement 40 that is from a puncture 41 in the cover 31 and a coaxial passage opening 42 in the form of a perforation through the knurled nut 32 consists. Another puncture is directly behind the illustrated opening 41 arranged (see 5 and 6 ). An end section 11a a resistance heating conductor 11 is through the passage arrangement 40 , ie through the passage opening 42 and through the puncture 41 through into the interior 106 of the receiving / connecting tank 10 guided and on the clamp body 15 attached. Into the puncture 41 is a sealant 50 fitted in the form of a silicone sleeve. The silicone sleeve has a circumferential groove 51 on that into the puncture 41 surrounds. This results in a secure fit of the silicone sleeve 50 in the puncture 41 , Through the silicone sleeve 50 becomes the end section 11a of the resistance heating conductor 11 guided. Another end section is directly behind the end section 11a arranged so that this in the representation of the 3 is not recognizable. In further extension, the end section 11a through the passage opening 42 guided. The knurled nut 32 includes an upper portion with a reinforced edge portion 321 which serves as gripping surface and normally has a surface structuring, in particular a knurling (not shown here). In the axial direction is followed by an inwardly retracted area, the one to the lower end of the knurled nut 32 running, circumferential thread 322 has, as a mating thread to the thread 105 of the receiving / connecting tank 10 is formed and fits into this fit. Both threads 322 and 105 together form a screw connection. The thread 105 is in an upper edge area 107 of the receiving / connecting tank 10 provided, the upper edge region 107 has a thinner thickness than the rest of the receiving / connecting container 10 , Because the entire receiving / connecting container 10 on the outside flush or even, results between the upper edge region 107 and the remaining area of the receiving / connecting container 10 a circumferential offset 108 , Similarly, the lower edge area 109 opposite the rest of the receiving / connecting tank 10 provided with a smaller thickness, so that this in a counterpart 131 on the mounting module 13 can surround.

4 shows the presentation 3 where the opening 102 through the closure device 30 is closed and the receiving / connecting container 10 firmly on the mounting module 13 is attached. The cover 31 lies with its underside on the circumferential offset 108 on. The underside of the knurled nut lies on its upper side 32 on through the screw connection 105 . 322 firmly on the receiving / connection container 10 is appropriate. Thus, the cover is 31 Although basically axially within the upper edge region 107 of the receiving / connecting tank 10 displaceable, but in the in 4 shown shutter position is between offset 108 and bottom of the knurled nut 32 clamped or fixed. Through the seal 50 is the puncture 41 in the cover 31 through which the end section 11a is guided, sealed so that no sealant 20 from the interior 106 of the receiving / connecting tank 10 can escape, even if the connecting device 100 would be brought from its vertical position. The lower, inwardly retracted edge area 109 of the receiving / connecting tank 10 is firmly on the mounting module 13 or its counterpart 131 at. Here also suitable connecting means, for example a clamping connection, a screw o. The like., May be provided.

5 shows a sectional view of a closure device 30 with guided end sections 11a . 11b a Widerstandsheizleiters in a not yet closed position. The closure device 30 includes a knurled nut 32 and a cover 31 , The cover 31 has two holes 41a . 41b on, in each case a silicone sleeve 50a . 50b is introduced. The silicone sleeves 50a . 50b grasp with grooves 51 into the punctures 41a . 41b one. The thickness or height of the silicone sleeves 50a . 50b is approximately three to four times the thickness of the cover 31 , Through the silicone sleeves 50a . 50b is in each case a resistance heating conductor 11a . 11b guided. In the further course are the end sections 11a . 11b through a passage opening 42 in the form of a coaxial bore in the knurled nut 32 guided. The passage holes 41a . 41b and the passage opening 42 together form a passage arrangement 40 , At the knurled nut 32 is the grip area 321 as well as the thread 322 to recognize. The cover 31 facing lower area 323 the knurled nut 32 has moved in all around. At this area is also the thread 322 intended. The retracted area 322 Its length corresponds approximately to the length of the area 107 of the receiving / connecting tank 10 , Thus, the upper grip area lies 321 the knurled nut on the end faces of the receiving / connecting container 10 on. Because the knurled nut 32 with the mating thread 105 at the receiving / connection container 10 is screwed and for this screw relative to the end sections 11a . 11b It has to be twisted, it is important that both end sections 11a . 11b through a single passage opening 42 in the knurled nut 32 be guided and that they play in the passage opening 42 to sit.

6 shows a plan view of a cover 31 with two holes 41a . 41b and two silicone sleeves arranged in the through holes as sealing means 50a . 50b , The two holes 41a . 41b are arranged at a predetermined distance from each other and are equidistant from the edge of the disc 31 away.

7a shows a cross-sectional view of a cover 31 with two holes 41a . 41b , The distance 311 (indicated by dashed lines) between the center 312 the cover 31 and the midpoints 411a . 411b the punctures 41a . 41b is the same. Furthermore, both centers are located 411a . 411b on one to the cover 31 coaxial circular ring 313 , Correspondingly, both are through holes 41a . 41b equidistant from the edge of the cover 31 arranged. The distance 314 between the two centers 411a . 411b the punctures 41a . 41b corresponds to the distance between two terminal locations for connection of the end sections of resistance heating conductors in the interior of a connection device.

7b shows a longitudinal section through the cover 31 and a puncture 41 ,

8th shows an application example of an arrangement with connection device 100 and with a resistance heater connected to an electrical supply 11 in which the resistance heating conductor is in its loop area 110 around a pipe 60 is arranged around, inside which there is a medium to be heated. To the pipe 60 there is an insulation around 61 provided, in turn, by a protective jacket 62 is enclosed. The heating conductor end sections 11a . 11b lead out of the pipeline layout 60 . 61 . 62 out and into a connection device 100 into it. In the present example, many similar Heizleiteranordnungen with connecting devices are expediently 100 at regular intervals along the pipeline 60 . 61 . 62 arranged.

LIST OF REFERENCE NUMBERS

100

connection device

10

Recording / connection containers

101

upper face area

102

opening

103

edge

104

loop

105

thread

106

inner space

107

upper edge area

108

offset

109

lower edge area

11

resistance heating

11a, 11b

end

110

loop

12

PTC

13

mounting module

131

counterpart

14

Plastic block

15

clamping bodies

151

connection point

16

between conductor

20

sealant

30

closure device

31

cover plate

311

Distance of bore center to cover center point

312

Center cover

313

annulus

314

Distance between the centers of the holes

32

knurled nut

321

grip area

322

thread

323

retracted area

40

Diffuser arrangement

41

perforation

411a, 411b

Center hole

41a, 41b

drillings

42

Port

50

silicone sleeve

50a, 50b

silicone sleeves

51

groove

60

pipe

61

insulation

62

mantle

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• Directive 94/9 EC [0006]

Claims (19)

Connection device ( 100 ) for connecting a, in particular multi-layered and / or mineral-insulated and / or coaxial, Widerstandsheizleiters ( 11 ) to an electrical supply ( 12 ) with a receiving / connecting container ( 10 ) for receiving a sealant ( 20 ) and for connecting at least one into the receiving / connecting container ( 10 ) end section ( 11a ; 11b ) of the resistance heating conductor ( 11 ) to one in the receiving / connecting container ( 10 ) electrical supply ( 12 ), wherein the receiving / connecting container (10) at least one opening ( 102 ) for filling the sealant ( 20 ) and for introducing the at least one end portion ( 11a ; 11b ) of the resistance heating conductor ( 11 ) into the receiving / connecting container ( 10 ), characterized in that a closure device ( 30 ) for closing the opening ( 102 ) of the receiving / connecting container ( 10 ) is provided. Connecting device according to claim 1, characterized in that the closure device ( 30 ) is formed such that it the opening ( 102 ) of the receiving / connecting container ( 10 ) to prevent leakage of the sealant ( 20 ) seals. Connecting device according to claim 1 or 2, characterized in that the closure device ( 30 ) a passage arrangement ( 40 ) for performing the at least one end portion ( 11a ; 11b ) of the resistance heating conductor ( 11 ) through the closure device ( 30 ) into the receiving / connecting container ( 10 ) having. Connecting device according to claim 3, characterized in that the passage arrangement ( 40 ) Sealant ( 50 ) for sealing the passage arrangement ( 40 ) having. Connecting device according to claim 3 or 4, characterized in that the passage arrangement ( 40 ) at least one, preferably two, through holes ( 41 ) through the closure device ( 30 ), wherein preferably the at least one perforation ( 41 ) at a predetermined distance from the edge of the receiving / connecting container ( 10 ) and / or arranged to a further perforation. Connecting device according to one of claims 3 to 5, characterized in that the connecting device ( 100 ) an electrical connection device ( 15 ) for electrically connecting the at least one end portion ( 11a ; 11b ) of the resistance heating conductor ( 11 ) with the electrical supply ( 12 ), and the passage arrangement ( 40 ) of the connection device ( 15 ) is assigned such that the through the passage arrangement ( 40 ) performed at least one end portion ( 11a ; 11b ) of the resistance heating conductor ( 11 ) fit into the connection device ( 15 ) is insertable. Connecting device according to one of the preceding claims, characterized in that the closure device ( 30 ) a covering agent ( 31 ), in particular a cover, whose dimensions preferably substantially the inner circumference or the outer periphery of the receiving / connecting container ( 10 ) correspond. Connecting device according to one of the preceding claims, characterized in that the closure device ( 30 ) Fastening means ( 32 ) for fastening the closure device ( 30 ) at the receiving / connecting container ( 10 ) having. Connecting device according to claim 8, characterized in that the fastening means ( 32 ) a screw connection ( 105 . 322 ) between closure device ( 30 ) and receiving / connecting container ( 10 ) with a screwing, in particular an end nut comprises. Connecting device according to claim 8 or 9, characterized in that the fastening means ( 32 ) a passage opening ( 42 ), which leads to the passage of the at least one end portion ( 11a ; 11b ), in particular for the passage of two end sections, of the resistance heating conductor ( 11 ) is trained. Connecting device according to one of claims 8 to 10, referring back to claim 7, characterized in that the fastening means ( 32 ) the covering means ( 31 ) is assigned such that the fastening means ( 32 ) the covering means ( 31 ) in the receiving / connection container ( 10 ) holds. Method for connecting a, in particular multi-layered and / or mineral-insulated and / or coaxial, resistance heating conductor ( 11 ) to an electrical supply ( 12 ), comprising the following steps: a.) Providing a receiving / connecting container ( 10 ), b.) Inserting an electrical supply ( 12 ) into the receiving / connecting container ( 10 ), c.) providing a fastener ( 32 ), in particular a closing nut, with a passage opening ( 42 ) and performing the at least one End section ( 11a ; 11b ) of the resistance heating conductor ( 11 ) through the passage opening ( 42 ), d.) providing a cover means ( 31 ), in particular cover, with at least one through hole ( 41 ) and introducing the at least one end portion ( 11a ; 11b ) of the resistance heating conductor ( 11 ) through the at least one perforation ( 41 ), e.) Connection of the at least one end section ( 11a ; 11b ) of the resistance heating conductor ( 11 ) to the electrical supply ( 12 ) within the receiving / connecting container ( 10 ), preferably by means of an electrical connection device ( 15 ), in particular clamping body, f.) filling a sealant ( 20 ) into the receiving / connecting container ( 10 ), and g.) Attaching the fastener ( 32 ) at the receiving / connecting container ( 10 ). Method according to claim 12, characterized in that in the at least one perforation ( 41 ) of the covering agent ( 31 ) a sealant ( 50 ) is provided. Connection device ( 100 ) for connecting a, in particular multi-layered and / or mineral-insulated and / or coaxial, Widerstandsheizleiters ( 11 ) to an electrical supply ( 12 ) with a receiving / connecting container ( 10 ) for receiving a sealant ( 20 ) and the at least one end portion ( 11a ; 11b ) of the resistance heating conductor ( 11 ), characterized in that the sealant ( 20 ) has a high thermal conductivity, wherein the thermal conductivity is at least 0.61 W / mK, preferably at least 0.91 W / mK, particularly preferably at least 1.21 W / mK. Connecting device according to claim 14, characterized in that the sealing compound ( 20 ) has a high electrical insulation capability, wherein the insulation strength is at least 500 V / mm, preferably at least 1000 V / mm, more preferably at least 1500 V / mm. Connecting device according to claim 14 or 15, characterized in that the sealing compound ( 20 ) is formed such that its maximum temperature resistance is at least 120 ° C, preferably at least 140 ° C, more preferably at least 160 ° C. Connecting device according to one of claims 14 to 16, characterized in that the sealing compound ( 20 ) has a pot life of less than or equal to 45 minutes, preferably less than or equal to 35 minutes, more preferably less than or equal to 30 minutes, at room temperature. Connecting device according to one of claims 14 to 17, characterized in that the sealing compound ( 20 ) is a two-component sealant. Use of a sealant ( 20 ) for filling into a connecting device ( 100 ) for connecting a, in particular multi-layered and / or mineral-insulated and / or coaxial, Widerstandsheizleiters ( 11 ) to an electrical supply ( 12 ), characterized in that the sealant ( 20 ) has a high thermal conductivity, wherein the thermal conductivity is at least 0.61 W / mK, preferably at least 0.91 W / mK, particularly preferably at least 1.21 W / mK, and / or that the sealant ( 20 ) has a high electrical insulation capability, wherein the insulation strength is at least 500 V / mm, preferably at least 1000 V / mm, more preferably at least 1500 V / mm, and / or that the sealant ( 20 ) is formed such that its maximum temperature resistance is at least 120 ° C, preferably at least 140 ° C, more preferably at least 160 ° C, and / or that the sealant ( 20 ) has a pot life of less than or equal to 45 minutes, preferably less than or equal to 35 minutes, more preferably less than or equal to 30 minutes, at room temperature.

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