EP0108958B1 - Connection of metallic heat exchanger tubes to the bottom of a water box - Google Patents

Connection of metallic heat exchanger tubes to the bottom of a water box Download PDF

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Publication number
EP0108958B1
EP0108958B1 EP83110458A EP83110458A EP0108958B1 EP 0108958 B1 EP0108958 B1 EP 0108958B1 EP 83110458 A EP83110458 A EP 83110458A EP 83110458 A EP83110458 A EP 83110458A EP 0108958 B1 EP0108958 B1 EP 0108958B1
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EP
European Patent Office
Prior art keywords
tubes
water tank
apertures
arrangement according
pressed
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.)
Expired
Application number
EP83110458A
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German (de)
French (fr)
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EP0108958A2 (en
EP0108958A3 (en
Inventor
Reinhold Kuchelmeister
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Mahle Behr GmbH and Co KG
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Behr GmbH and Co KG
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Publication of EP0108958A2 publication Critical patent/EP0108958A2/en
Publication of EP0108958A3 publication Critical patent/EP0108958A3/en
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Publication of EP0108958B1 publication Critical patent/EP0108958B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
    • F28F21/067—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/162—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by using bonding or sealing substances, e.g. adhesives

Definitions

  • the invention relates to a connection arrangement for metallic tubes of a heat exchanger with a bottom of a water box, the bottom consisting of plastic and being an integral part of the water box.
  • a heat exchanger is known in which the water boxes consist of a tubular plastic part, the tube sheet being an integral part of the water box.
  • the water tank has a plurality of openings, each of which is provided with a rubber seal, into which the ends of the heat exchanger tubes are inserted.
  • the seals only have the task of preventing the heat exchanger fluid from escaping; however, the water box is not attached to the heat exchanger block.
  • lateral fastening elements in the form of frame parts are provided, which clamp the water boxes and the heat exchanger block between them.
  • connection arrangements for heat exchanger tubes with a water tank in which the tubes are fastened and sealed in a metallic tube sheet by radial expansion (DE-OS 24 48 332).
  • DE-OS 24 48 332 radial expansion
  • connection arrangement of the type defined in the preamble of claim 1, which, in addition to reliable sealing, also ensures high mechanical strength without separate fastening means.
  • the openings can be cylindrical and can be provided with a run-on cone at their outer end; however, they can also be designed to taper conically in the direction of the interior of the water tank.
  • the material pairing of the metallic pipe and the plastic water tank has a particularly favorable effect, since the plastic material partly or completely fills the grooves due to its greater elasticity.
  • the materials and the dimensions of the parts are selected so that the pipes are elastically constricted by the pressing in and at the same time the openings in the base are elastically widened. It is particularly useful to press the pipe end as far into the bottom of the water box that it protrudes a little from the inside of the water box and springs back into its original, enlarged form due to the elasticity of the material. As a result, the end of the opening lying on the inside of the water box forms a sealing edge on which there is increased pressure due to the elastically widened end.
  • the deformation of the floor and the pipes does not have to be in the purely elastic range, great strength and good sealing are achieved even if one of the two parts is plastically or elastically and plastically deformed. This has the advantage that larger manufacturing tolerances of the pipe outer diameter and the openings are permissible and a perfect connection is nevertheless achieved.
  • a curable sealant is preferably applied in microencapsulated form, the microencapsulation being destroyed by the axial pressing. After exiting the capsules, the sealant is distributed on the connecting surface and collects, for example, in unevenness in the tubular surface or the opening wall.
  • connection arrangement according to the invention is explained in more detail below with reference to the drawing.
  • FIG. 1 shows a water box 1 made of a plastic material, the bottom 2 of which is an integral part of the water box 1.
  • the thickness of the bottom 2 is substantially greater than the wall thickness of the rest of the water box 1.
  • Inside the water box 1 there is a vertical partition 3, through which two chambers, namely an inlet chamber 4 and a return chamber 5, are formed in the water box 1.
  • the partition 3 also serves to stiffen the water box 1.
  • the water box 1 has projections 11 and 12 at some predetermined points, which serve to clamp the water box in order to axially press in the pipe ends 7 of the heat exchanger block 10.
  • the support force acts on the projections 11.
  • the projections 11 and 12 also contribute to the stiffening of the water box 1.
  • the detail Z from FIG. 1 is shown enlarged in FIG.
  • the bottom 2 has a cylindrical opening 6 with a conical run-up 14, which is intended to facilitate the insertion of the end 7 of the tubular fork 8.
  • the pipe end 7 has a sawtooth-shaped structure on its outer surface, which is formed by correspondingly shaped projections 15 and grooves 16, each of which extends in the circumferential direction. Since the outer diameter of the tube forks 8 is originally larger than the diameter of the opening 6, when the tube end 7 is pressed axially into the base 2, the tube end 7 is constricted elastically and the opening 6 is widened elastically. The deformation of the base or of the openings or of the pipes can also be in the plastic or elastic-plastic area.
  • the axial pressing in of the pipes creates a strong interference fit between the pipes and the bottom of the water tank.
  • the projections 15 ensure that a plurality of sealing edges are formed between the pipe end 7 and the base 2, it being possible for the cavities lying between the respective sealing edges and formed by the grooves 16 to be filled with a sealing agent.
  • the end of the opening 6 lying on the inside of the water tank forms a sealing edge 17, on which the spring-loaded end 7 ′ results in increased pressure.
  • FIG. 3 shows an embodiment variant of FIG. 2, a cylindrical opening 6 being shown in the bottom 2.
  • the opening 6 has a starting cone 14 'which is longer than in FIG. 2 and which has the opening angle ⁇ with respect to the central axis.
  • the pipe end 7 has a smooth outer surface, which lies tightly against the wall of the opening 6 in the base 2 over its entire axial length.
  • FIG. 4 shows a section through a water box with pressed-in heat exchanger tubes, the water box 1 having a base 2 being produced as a one-piece plastic part.
  • Conical openings 6 tapering towards the interior of the water tank are arranged in the bottom 2, into which pipe ends 7 of heat exchanger pipes 18 are pressed.
  • the pipe ends 7 are pressed into the base 2, due to the conical design of the openings 6, there is an increasing constriction of the tube ends 7 and an increasing elastic deformation of the base 2, the deformation of one of the two parts also being able to be in the plastic or elastic-plastic range .
  • the tube ends 7 are pressed in so far that they have a part 7 'projecting into the interior of the water tank, which springs back into its original shape due to the previous elastic constriction, which is lifted when it enters the interior. In this case too, there is a sealing edge 17 at the inner end of the opening 6 as in FIG. 3.
  • FIG. 5 shows a section of the water tank bottom 2 with a conical opening 6.
  • the conical opening 6 has three in Grooves 19 extending in the circumferential direction.
  • the wall of the opening 6 and the grooves 19 are coated with a lubricant and sealant 20, the lubricant and sealant 20 being applied in a microencapsulated form.
  • FIG. 6 shows the section of the water tank bottom 6 according to FIG. 5, but with the pipe end 7 pressed in.
  • microencapsulation has the advantage that the sealant and lubricant is applied like a dry substance without the agent contained in the capsules being subject to a chemical change, for example due to aging or reaction.
  • the microencapsulation thus makes it possible to provide the openings in the water tank floor with a lubricant and / or sealant even when the water tank is being produced, even if the water tank is stored for a long time until it is connected to the heat exchanger block.

Description

Die Erfindung bezieht sich auf eine Verbindungsanordnung für metallische Rohre eines Wärmetauschers mit einem Boden eines Wasserkastens, wobei der Boden aus Kunststoff besteht und integraler Bestandteil des Wasserkastens ist.The invention relates to a connection arrangement for metallic tubes of a heat exchanger with a bottom of a water box, the bottom consisting of plastic and being an integral part of the water box.

Aus der DE-AS 24 35 632 ist ein Wärmetauscher bekannt, bei dem die Wasserkästen aus einem rohrförmigen Kunststoffteil bestehen, wobei der Rohrboden integraler Bestandteil des Wasserkastens ist. Der Wasserkasten weist eine Vielzahl von Öffnungen auf, die jeweils mit einer Gummidichtung versehen sind, in die die Enden der Wärmetauscherrohre gesteckt sind. Die Dichtungen haben dabei lediglich die Aufgabe, einen Austritt des Wärmetauscherfluids zu verhindern ; der Wasserkasten wird dadurch jedoch nicht auf dem Wärmetauscherblock befestigt. Zur Befestigung der Wasserkästen sind seitliche Befestigungselemente in Form von Rahmenteilen vorgesehen, die die Wasserkästen und den dazwischenliegenden Wärmetauscherblock miteinander verspannen.From DE-AS 24 35 632 a heat exchanger is known in which the water boxes consist of a tubular plastic part, the tube sheet being an integral part of the water box. The water tank has a plurality of openings, each of which is provided with a rubber seal, into which the ends of the heat exchanger tubes are inserted. The seals only have the task of preventing the heat exchanger fluid from escaping; however, the water box is not attached to the heat exchanger block. To fasten the water boxes, lateral fastening elements in the form of frame parts are provided, which clamp the water boxes and the heat exchanger block between them.

Ganz abgesehen davon, daß bei derartigen Gummidichtungen besondere Anforderungen an die Alterungsbeständigkeit gestellt werden, bringen die zusätzlichen Teile (Gummidichtungen und Befestigungsmittel) Kosten für die Herstellung dieser Teile sowie für Lagerhaltung und Montage mit sich, was insbesondere bei einer Großserienfertigung von Nachteil ist.Quite apart from the fact that special demands are placed on aging resistance with such rubber seals, the additional parts (rubber seals and fasteners) entail costs for the production of these parts as well as for storage and assembly, which is particularly disadvantageous in large-scale production.

Es sind ferner Verbindungsanordnungen für Wärmetauscherrohre mit einem Wasserkasten bekannt, bei denen die Rohre durch radiales Aufweiten in einem metallischen Rohrboden befestigt und abgedichtet sind (DE-OS 24 48 332). Diese Maßnahme ist jedoch nur dann möglich, wenn der Rohrboden ein separates Teil des Wasserkastens ist und der Wasserkasten erst nach Herstellung der Verbindung aufgesetzt wird. Bei einer solchen Ausführung ist jedoch der Wasserkasten nicht als einstückiges Spritzgußteil aus Kunststoffmaterial herstellbar.There are also known connection arrangements for heat exchanger tubes with a water tank, in which the tubes are fastened and sealed in a metallic tube sheet by radial expansion (DE-OS 24 48 332). However, this measure is only possible if the tube sheet is a separate part of the water box and the water box is only placed after the connection has been made. In such an embodiment, however, the water tank cannot be produced as a one-piece injection-molded part made of plastic material.

Es sind ferner aus dem allgemeinen Maschinenbeu Längspreßsitzverbindungen bekannt, die dadurch erzeugt werden, daß die Fügeteile unter Übermaß ineinandergepreßt werden.There are also known from the general Maschinenbeu longitudinal press fit connections which are produced in that the parts to be joined are pressed into one another to an excessive extent.

Es ist daher die Aufgabe der Erfindung, eine Verbindungsanordnung der im Oberbegriff des Anspruchs 1 bezeichneten Gattung zu schaffen, die neben einer zuverlässigen Abdichtung auch eine hohe mechanische Festigkeit ohne separate Befestigungsmittel gewährleistet.It is therefore the object of the invention to provide a connection arrangement of the type defined in the preamble of claim 1, which, in addition to reliable sealing, also ensures high mechanical strength without separate fastening means.

Diese Aufgabe wird bei einer Verbindungsanordnung für metallische Rohre eines Wärmetauschers mit einem Boden eines Wasserkastens der. gattungsgemäßem Art durch die kennzeichnenden Merkmale des Anspruchs 1 oder des Anspruchs 2 gelöst. Dabei wird nicht nur die Verwendung eines kostengünstig im Spritzgußverfahren einstückig herstellbaren Wasserkastens erreicht, es sind darüberhinaus für die Abdichtung der Rohre und die Befestigung der Wasserkästen am Wärmetauscherblock keine zusätzlichen Bauteile erforderlich. Der Wärmetauscher weist somit ein Minimum an erforderlichen Komponenten auf, was schließlich zu einer Verringerung der Herstellungskosten führt. Die Rillen bzw. die sägezahnförmige Struktur tragen einerseits zur Erzeugung mehrerer Dichtkanten bei ; sie können aber andererseits auch als Sammelräume für ein aushärtbares Dichtungsmittel dienen.This object is achieved in a connection arrangement for metallic pipes of a heat exchanger with a bottom of a water tank. Generic type solved by the characterizing features of claim 1 or claim 2. Not only is the use of a water box, which can be produced inexpensively in the injection molding process, but no additional components are required for the sealing of the pipes and the fastening of the water boxes to the heat exchanger block. The heat exchanger thus has a minimum of required components, which ultimately leads to a reduction in manufacturing costs. The grooves or the sawtooth-shaped structure on the one hand contribute to the production of several sealing edges; on the other hand, they can also serve as collecting spaces for a curable sealant.

Für die Gestaltung der Öffnungen gibt es verschiedene Möglichkeiten, so können die Öffnungen zum Beispiel zylindrisch ausgebildet und an ihrem außen liegenden Ende mit einem Anlaufkonus versehen sein ; sie können jedoch auch in Richtung auf den Innenraum des Wasserkastens konisch verjüngt ausgebildet sein.There are various options for the design of the openings, for example the openings can be cylindrical and can be provided with a run-on cone at their outer end; however, they can also be designed to taper conically in the direction of the interior of the water tank.

Im Falle der sägezahnförmigen Struktur wirkt sich besonders günstig die Werkstoffpaarung von metallischem Rohr und Kunststoffwasserkasten aus, da das Kunststoffmaterial aufgrund seiner größeren Elastizität die Rillen teilweise oder ganz ausfüllt.In the case of the sawtooth-shaped structure, the material pairing of the metallic pipe and the plastic water tank has a particularly favorable effect, since the plastic material partly or completely fills the grooves due to its greater elasticity.

Vorzugsweise werden die Materialien und die Abmessungen der Teile so ausgewählt, daß durch das Einpressen die Rohre elastisch eingeschnürt und gleichzeitig die Öffnungen im Boden elastisch aufgeweitet sind. Hierbei ist es besonders zweckmäßig, das Rohrende soweit in den Boden des Wasserkastens einzupressen, daß es auf der Innenseite des Wasserkastens ein kleines Stück aus dem Boden ragt und dort aufgrund der Elastizität des Materials wieder in seine ursprüngliche, im Durchmesser erweiterte Form zurückfedert. Dadurch bildet das auf der Innenseite des Wasserkastens liegende Ende der Öffnung eine Dichtkante, an der sich durch das elastisch wieder aufgeweitete Ende eine verstärkte Pressung ergibt. Die Verformung des Bodens und der Rohre muß nicht im rein elastischen Bereich liegen, es wird auch dann eine große Festigkeit und gute Abdichtung erreicht, wenn eines der beiden Teile plastisch bzw. elastischplastisch verformt ist. Dies hat den Vorteil, daß größere Fertigungstoleranzen der Rohraußendurchmesser und der Öffnungen zulässig sind und trotzdem eine einwandfreie Verbindung erreicht wird.Preferably, the materials and the dimensions of the parts are selected so that the pipes are elastically constricted by the pressing in and at the same time the openings in the base are elastically widened. It is particularly useful to press the pipe end as far into the bottom of the water box that it protrudes a little from the inside of the water box and springs back into its original, enlarged form due to the elasticity of the material. As a result, the end of the opening lying on the inside of the water box forms a sealing edge on which there is increased pressure due to the elastically widened end. The deformation of the floor and the pipes does not have to be in the purely elastic range, great strength and good sealing are achieved even if one of the two parts is plastically or elastically and plastically deformed. This has the advantage that larger manufacturing tolerances of the pipe outer diameter and the openings are permissible and a perfect connection is nevertheless achieved.

Es kann zweckmäßig sein, die Rohre und/oder die Öffnungen vor dem Einpressen mit einem aushärtbaren Dichtungsmittel zu versehen. Ein solcher Auftrag eines Dichtungsmittels erfolgt vorzugsweise in mikroverkapselter Form, wobei die Mikroverkapselung durch das axiale Einpressen zerstört wird. Das Dichtungsmittel verteilt sich nach Austreten aus den Kapseln an der Verbindungsfläche und sammelt sich beispielsweise in Unebenheiten der Rohrmantelfläche oder der Öffnungswandung.It may be expedient to provide the pipes and / or the openings with a curable sealant before the pressing. Such a sealant is preferably applied in microencapsulated form, the microencapsulation being destroyed by the axial pressing. After exiting the capsules, the sealant is distributed on the connecting surface and collects, for example, in unevenness in the tubular surface or the opening wall.

Zur Versteifung des Wasserkastens, und zu dessen Abstützung während des Einpressens der Rohre, sind zweckmäßigerweise Mittel in Form von Materialverdickungen, die beispielsweise durch Vorsprünge oder Rippen gebildet werden, vorgesehen.To stiffen the water tank, and to its support during the pressing in of the pipes, means in the form of material thickening, which are formed, for example, by projections or ribs, are expediently provided.

Ausführungsbeispiele der erfindungsgemäßen Verbindungsanordnung werden nachstehend anhand der Zeichnung näher erläutert.Exemplary embodiments of the connection arrangement according to the invention are explained in more detail below with reference to the drawing.

In der Zeichnung zeigt

  • Figur 1 einen Schnitt durch einen Wasserkasten mit eingepreßten Wärmetauscherrohren,
  • Figur 2 eine vergrößerte Darstellung der Einzelheit Z in Figur 1,
  • Figur 3 eine Ausführungsvariante zu Figur 2,
  • Figur 4 einen Schnitt durch einen Wasserkasten mit eingepreßten Wärmetauscherrohren in perspektivischer Darstellung,
  • Figur 5 eine vergrößerte Darstellung einer Öffnung des Bodens und eines Rohres vor dem Einpressen und mikroverkapseltem Gleit- und Dichtungsmittel in der Öffnung,
  • Figur 6 eine Darstellung der Rohr/Boden-Verbindung gemäß Figur 5 im fertigen Zustand.
In the drawing shows
  • FIG. 1 shows a section through a water tank with pressed-in heat exchanger tubes,
  • FIG. 2 shows an enlarged illustration of the detail Z in FIG. 1,
  • 3 shows a variant of FIG. 2,
  • FIG. 4 shows a section through a water tank with pressed-in heat exchanger tubes in a perspective view,
  • FIG. 5 shows an enlarged view of an opening in the base and a tube before being pressed in and microencapsulated lubricant and sealant in the opening,
  • Figure 6 is an illustration of the pipe / floor connection according to Figure 5 in the finished state.

In Figur 1 ist ein aus einem Kunststoffmaterial bestehender Wasserkasten 1 dargestellt, dessen Boden 2 integraler Bestandteil des Wasserkastens 1 ist. Die Dicke des Bodens 2 ist wesentlich größer als die Wandstärke des übrigen Wasserkastens 1. Im Innern des Wasserkastens 1 befindet sich eine senkrechte Trennwand 3, durch die im Wasserkasten 1 zwei Kammern, nämlich eine Zulaufkammer 4 und eine Rücklaufkammer 5 gebildet werden. Die Trennwand 3 dient außerdem zur Versteifung des Wasserkastens 1. Im Boden 2 befinden sich Öffnungen 6, in die die Enden 7 von Rohrgabeln 8 eingepreßt sind. Die Rohrgabeln 8 bilden zusammen mit einer Vielzahl von quer angeordneten Rippen 9 einen Wärmetauscherblock 10. Der Wasserkasten 1 weist an einigen vorbestimmten Stellen Vorsprünge 11 und 12 auf, die zum Einspannen des Wasserkastens zum axialen Einpressen der Rohrenden 7 des Wärmetauscherblocks 10 dienen. Die Abstützkraft, deren Richtung durch die Pfeile 13 dargestellt ist, wirkt auf die Vorsprünge 11. Die Vorsprünge 11 und 12 tragen außerdem zur Versteifung des Wasserkastens 1 bei.1 shows a water box 1 made of a plastic material, the bottom 2 of which is an integral part of the water box 1. The thickness of the bottom 2 is substantially greater than the wall thickness of the rest of the water box 1. Inside the water box 1 there is a vertical partition 3, through which two chambers, namely an inlet chamber 4 and a return chamber 5, are formed in the water box 1. The partition 3 also serves to stiffen the water box 1. In the bottom 2 there are openings 6, into which the ends 7 of pipe forks 8 are pressed. The pipe forks 8, together with a plurality of transversely arranged ribs 9, form a heat exchanger block 10. The water box 1 has projections 11 and 12 at some predetermined points, which serve to clamp the water box in order to axially press in the pipe ends 7 of the heat exchanger block 10. The support force, the direction of which is shown by the arrows 13, acts on the projections 11. The projections 11 and 12 also contribute to the stiffening of the water box 1.

In Figur 2 ist die Einzelheit Z aus Figur 1 vergrößert dargestellt. Der Boden 2 hat eine zylindrische Öffnung 6 mit einem konischen Anlauf 14, der das Einführen des Endes 7 der Rohrgabel 8 erleichtern soll. Das Rohrende 7 weist an seiner Mantelfläche eine sägezahnförmige Struktur auf, die durch entsprechend geformte Vorsprünge 15 und Rillen 16, die jeweils in Umfangsrichtung verlaufen, gebildet ist. Da der Außendurchmesser der Rohrgabeln 8 ursprünglich größer ist als der Durchmesser der Öffnung 6, wird beim axialen Einpressen des Rohrendes 7 in dem Boden 2 das Rohrende 7 elastisch eingeschnürt und die Öffnung 6 elastisch aufgeweitet. Die Verformung des Bodens bzw. der Öffnungen oder der Rohre kann auch im plastischen bzw. elastisch-plastischen Bereich liegen. Durch das axiale Einpressen der Rohre wird ein starker Preßsitz zwischen den Rohren und dem Boden des Wasserkastens erzeugt. Durch die Vorsprünge 15 wird erreicht, daß mehrere Dichtkanten zwischen Rohrende 7 und dem Boden 2 gebildet werden, wobei die zwischen den jeweiligen Dichtkanten liegenden und durch die Rillen 16 gebildeten Hohlräume mit einem Dichtungsmittel gefüllt sein können. Das äußerste Rohrende 7' ragt ein kleines Stück in die Zulaufkammer 4, wobei das aus dem Boden 2 hervorstehende Rohrende 7' aufgrund der Elastizität des Materials wieder in seine ursprüngliche, im Durchmesser erweiterte Form zurückfedert. Dadurch bildet das auf der Innenseite des Wasserkastens liegende Ende der Öffnung 6 eine Dichtkante 17, an der sich durch das aufgefederte Ende 7' eine verstärkte Pressung ergibt.The detail Z from FIG. 1 is shown enlarged in FIG. The bottom 2 has a cylindrical opening 6 with a conical run-up 14, which is intended to facilitate the insertion of the end 7 of the tubular fork 8. The pipe end 7 has a sawtooth-shaped structure on its outer surface, which is formed by correspondingly shaped projections 15 and grooves 16, each of which extends in the circumferential direction. Since the outer diameter of the tube forks 8 is originally larger than the diameter of the opening 6, when the tube end 7 is pressed axially into the base 2, the tube end 7 is constricted elastically and the opening 6 is widened elastically. The deformation of the base or of the openings or of the pipes can also be in the plastic or elastic-plastic area. The axial pressing in of the pipes creates a strong interference fit between the pipes and the bottom of the water tank. The projections 15 ensure that a plurality of sealing edges are formed between the pipe end 7 and the base 2, it being possible for the cavities lying between the respective sealing edges and formed by the grooves 16 to be filled with a sealing agent. The outermost pipe end 7 'protrudes a little bit into the inlet chamber 4, the pipe end 7' protruding from the base 2 springing back into its original, enlarged diameter due to the elasticity of the material. As a result, the end of the opening 6 lying on the inside of the water tank forms a sealing edge 17, on which the spring-loaded end 7 ′ results in increased pressure.

In Figur 3 ist eine Ausführungsvariante zu Figur 2 dargestellt, wobei im Boden 2 wiederum eine zylindrische Öffnung 6 dargestellt ist. Die Öffnung 6 besitzt einen gegenüber Figur 2 längeren Anlaufkonus 14', der bezogen auf die Mittelachse den Öffnungswinkel α besitzt. Gemäß Figur 3 besitzt das Rohrende 7 eine glatte Mantelfläche, die über ihre gesamte axiale Länge dicht an der Wandung der Öffnung 6 im Boden 2 anliegt. Beim Einpressen wird - ebenso wie in Figur 2 - das Rohrende 7 elastisch eingeschnürt und die Öffnung 6 elastisch aufgeweitet, wobei die Verformung eines der beiden Teile auch im plastischen bzw. elastisch-plastischen Bereich liegen kann. Das in die Zulaufkammer 4 ragende Rohrende 7' nimmt aufgrund der Elastizität des Materials wieder seine ursprüngliche Form ein, wodurch das auf der Innenseite des Wasserkastens liegende Ende der Öffnung 6 eine Dichtkante 17 bildet, an der sich durch das aufgefederte Ende 7' eine verstärkte Pressung ergibt.FIG. 3 shows an embodiment variant of FIG. 2, a cylindrical opening 6 being shown in the bottom 2. The opening 6 has a starting cone 14 'which is longer than in FIG. 2 and which has the opening angle α with respect to the central axis. According to FIG. 3, the pipe end 7 has a smooth outer surface, which lies tightly against the wall of the opening 6 in the base 2 over its entire axial length. When pressing in - as in FIG. 2 - the pipe end 7 is constricted elastically and the opening 6 is widened elastically, the deformation of one of the two parts also being able to lie in the plastic or elastic-plastic area. The pipe end 7 'projecting into the inlet chamber 4 resumes its original shape due to the elasticity of the material, as a result of which the end of the opening 6 lying on the inside of the water box forms a sealing edge 17 on which an increased pressure is created by the spring-loaded end 7' results.

In Figur 4 ist ein Schnitt durch einen Wasserkasten mit eingepreßten Wärmetauscherrohren gezeigt, wobei der Wasserkasten 1 mit einem Boden 2 als einstückiges Kunststoffteil hergestellt ist. Im Boden 2 sind konische, zum Innenraum des Wasserkastens hin verjüngende Öffnungen 6 angeordnet, in die Rohrenden 7 von Wärmetauscherrohren 18 eingepreßt sind. Beim Einpressen der Rohrenden 7 in den Boden 2 erfolgt aufgrund der konischen Ausbildung der Öffnungen 6 eine zunehmende Einschnürung der Rohrenden 7 und eine ansteigende elastische Verformung des Bodens 2, wobei die Verformung eines der beiden Teile auch im plastischen bzw. elastisch-plastischen Bereich liegen kann. Die Rohrenden 7 werden soweit eingepreßt, daß sie einen in den Wasserkasteninnenraum ragenden Teil 7' aufweisen, der aufgrund der vorangegangenen elastischen Einschnürung, die bei Durchtritt in den Innenraum aufgehoben ist, wieder in seine ursprüchliche Form zurückfedert. Auch in diesem Fall ergibt sich am inneren Ende der Öffnung 6 eine Dichtkante 17 wie in Figur 3.FIG. 4 shows a section through a water box with pressed-in heat exchanger tubes, the water box 1 having a base 2 being produced as a one-piece plastic part. Conical openings 6 tapering towards the interior of the water tank are arranged in the bottom 2, into which pipe ends 7 of heat exchanger pipes 18 are pressed. When the pipe ends 7 are pressed into the base 2, due to the conical design of the openings 6, there is an increasing constriction of the tube ends 7 and an increasing elastic deformation of the base 2, the deformation of one of the two parts also being able to be in the plastic or elastic-plastic range . The tube ends 7 are pressed in so far that they have a part 7 'projecting into the interior of the water tank, which springs back into its original shape due to the previous elastic constriction, which is lifted when it enters the interior. In this case too, there is a sealing edge 17 at the inner end of the opening 6 as in FIG. 3.

In Figur 5 ist ein Ausschnitt des Wasserkastenbodens 2 mit konischer Öffnung 6 dargestellt. Die konische Öffnung 6 weist drei in Umfangsrichtung verlaufende Rillen 19 auf. Die Wand der Öffnung 6 und die Rillen 19 sind mit einem Gleit- und Dichtungsmittel 20 überzogen, wobei das Gleit- und Dichtungsmittel 20 in mikroverkapselter Form aufgetragen ist. Figur 6 zeigt den Ausschnitt des Wasserkastenbodens 6 gemäß Figur 5, jedoch mit eingepreßtem Rohrende 7.FIG. 5 shows a section of the water tank bottom 2 with a conical opening 6. The conical opening 6 has three in Grooves 19 extending in the circumferential direction. The wall of the opening 6 and the grooves 19 are coated with a lubricant and sealant 20, the lubricant and sealant 20 being applied in a microencapsulated form. FIG. 6 shows the section of the water tank bottom 6 according to FIG. 5, but with the pipe end 7 pressed in.

Beim axialen Einpressen des Rohres werden aufgrund der einwirkenden Kräfte die Mikrokapseln zerstört und das Gleit- und Dichtmittel verteilt sich an der Verbindungsfläche und sammelt sich schließlich in den aufgrund von Unebenheiten der Rohroberfläche gebildeten Hohlräumen zwischen der Mantelfläche des Rohres und der Wandung der Öffnung 6. Wie in den bereits beschriebenen Anordnungen, so erfolgt auch beim Ausführungsbeispiel gemäß Figur 5 und 6 beim Einpressen des Rohrendes 7 in den Boden 2 eine elastische Einschnürung des Rohrendes 7 und eine elastische Aufweitung der Öffnung 6, wobei die Verformung eines der beiden Teile auch im plastischen bzw. elastisch-plastischen Bereich liegen kann. Der in den Innenraum des Wasserkastens ragende Teil 7' des Rohrendes 7 ist ebenfalls aufgrund der Elastizität des Materials in seine ursprüngliche, aufgeweitete Form zurückgefedert, wodurch an der Dichtkante 17 eine verstärkte Pressung erzeugt wird.When the tube is pressed in axially, the microcapsules are destroyed due to the forces acting on it and the lubricant and sealant are distributed over the connecting surface and finally collect in the cavities formed due to unevenness in the tube surface between the outer surface of the tube and the wall of the opening 6.How in the arrangements already described, so also in the embodiment according to FIGS. 5 and 6, when the pipe end 7 is pressed into the base 2, there is an elastic constriction of the pipe end 7 and an elastic widening of the opening 6, the deformation of one of the two parts also in the plastic or may be elastic-plastic area. The part 7 'of the pipe end 7 which projects into the interior of the water tank is also spring-back into its original, expanded shape due to the elasticity of the material, as a result of which an increased pressure is generated at the sealing edge 17.

Neben der Mikroverkapselung gibt es auch andere Möglichkeiten, ein Gleit- und/oder Dichtungsmittel aufzutragen. Die Mikroverkapselung bietet jedoch den Vorteil, daß das Dicht- und Gleitmittel wie eine Trockensubstanz aufgetragen wird, ohne daß das in den Kapseln enthaltene Mittel einer chemischen Veränderung, beispielsweise durch Alterung oder Reaktion, unterliegt. Die Mikroverkapselung ermöglicht es somit, die Öffnungen im Wasserkastenboden bereits bei der Herstellung des Wasserkastens mit einem Gleit-und/oder Dichtmittel zu versehen, auch wenn der Wasserkasten bis zur Verbindung mit dem Wärmetauscherblock über längere Zeit gelagert wird.In addition to microencapsulation, there are other ways to apply a lubricant and / or sealant. However, microencapsulation has the advantage that the sealant and lubricant is applied like a dry substance without the agent contained in the capsules being subject to a chemical change, for example due to aging or reaction. The microencapsulation thus makes it possible to provide the openings in the water tank floor with a lubricant and / or sealant even when the water tank is being produced, even if the water tank is stored for a long time until it is connected to the heat exchanger block.

Claims (12)

1. Arrangement for connecting metal tubes of a heat exchanger with a tube plate of a water tank, the tube plate consisting of synthetic plastics material and being an integral component part of the water tank, characterised in that the tubes (8, 18) are fixed in the water tank (1) by being axially pressed into apertures (6) in the tube plate (2) and sealed, the apertures (6) having one or a plurality of peripherally extending grooves (19) and in that prior to the tubes (8, 18) being pressed into position, at least a part of the apertures has a smaller diameter than the outside diameter of the tubes, a strong press-fit being created by the tube ends (7) being pressed axially into the apertures (6).
2. Arrangement for connecting metal tubes of a heat exchanger with a tube plate of a water tank, the tube plate consisting of synthetic plastics material and being an integral component part of the water tank, characterised in that th tubes (8, 18) are fixed in the water tank (1) by being axially pressed into apertures (6) in the tube plate (2) and sealed, and in that prior to the tubes (8, 18) being pressed into position, at least a part of the apertures has a smaller diameter than the outside diameter of the tubes, a strong press-fit being created by the tube ends (7) being pressed axially into the apertures (6), and in that the part of the tubes (tube ends 7) located in the tube plate (2) of the water tank (1) is provided with a serrated outer surface.
3. Connecting arrangement according to Claim 1 or 2, characterised in that the apertures (6) are of cylindrical form, their outer ends being provided with a run-on cone (14).
4. Connecting arrangement according to Claim 1 or 2, characterised in that the apertures (6) are conically tapered in the direction of the interior of the water tank (1).
5. Connecting arrangement according to one of the preceding Claims, characterised in that the pressing-in operation causes the tubes (tube ends 7) to be elastically constricted while the apertures (6) in the end piece (2) are elastically widened.
6. Connecting arrangement according to Claim 5, characterised in that the tubes (7) or the apertures (6) are also subjected to a plastic change of shape.
7. Connecting arrangement according to Claim 5 or 6, characterised in that an end (7) of the tubes (8, 18) projects on the inside of the water tank (1) and out of the tube plate (2), springing back into its original shape again by reason of the elasticity of the material.
8. Connecting arrangement according to one of the preceding Claims, characterised in that the tubes (tube ends 7) and/or the apertures (6) are provided with a hardenable sealing material prior to being pressed into place.
9. Connecting arrangement according to Claim 8, characterised in that the sealing material is applied in micro-encapsulated form, the microencapsulation being destroyed by the axial forcing-in stage.
10. Connecting arrangement according to one of the preceding Claims, characterised in that the water tank (1) has means (3, 11, 12) providing reinforcement and bracing while the tubes (8, 18) are being pressed into position.
11. Connecting arrangement according to one of the preceding Claims, characterised in that the water tank (1) consists of a 30 % glass fibre reinforced polyamide.
12. Connecting arrangement according to one of the preceding Claims, characterised in that the tube ends are tapered to facilitate the pressing-on operation.
EP83110458A 1982-11-13 1983-10-20 Connection of metallic heat exchanger tubes to the bottom of a water box Expired EP0108958B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3242072A DE3242072C2 (en) 1982-11-13 1982-11-13 Connection arrangement for metallic pipes of a heat exchanger with a bottom of a water tank
DE3242072 1982-11-13

Publications (3)

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EP0108958A2 EP0108958A2 (en) 1984-05-23
EP0108958A3 EP0108958A3 (en) 1984-08-15
EP0108958B1 true EP0108958B1 (en) 1986-03-26

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EP83110458A Expired EP0108958B1 (en) 1982-11-13 1983-10-20 Connection of metallic heat exchanger tubes to the bottom of a water box

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EP (1) EP0108958B1 (en)
DE (2) DE3242072C2 (en)
ES (1) ES8405509A1 (en)

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GB2235973A (en) * 1989-07-06 1991-03-20 Sterling Engineered Products L Vehicle radiator assemblies
FR2676534B1 (en) * 1991-05-14 1999-02-12 Valeo Thermique Moteur Sa TUBE BEAM HEAT EXCHANGER, PARTICULARLY FOR A MOTOR VEHICLE, AND METHOD FOR THE PRODUCTION THEREOF.
HU9200588D0 (en) * 1992-02-24 1992-05-28 Energiagazdalkodasi Intezet Pipe joint consisting of pipe wall and pipe as well as method for producing said joint
DE19719259B4 (en) * 1997-05-07 2005-08-18 Valeo Klimatechnik Gmbh & Co. Kg Flat tube heat exchanger for motor vehicles with flat tubes held on collars of a tube plate
KR101283406B1 (en) * 2006-06-30 2013-07-08 삼성전자주식회사 Mobile communication terminal and method for selecting/reselecting cell using distance factor with base station

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Also Published As

Publication number Publication date
EP0108958A2 (en) 1984-05-23
DE3362711D1 (en) 1986-04-30
ES526160A0 (en) 1984-06-16
DE3242072C2 (en) 1985-10-24
EP0108958A3 (en) 1984-08-15
ES8405509A1 (en) 1984-06-16
DE3242072A1 (en) 1984-05-17

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