EP0777093B1 - Method for the manufacture of inserts and linings - Google Patents

Abstract

Device (10) to connect a radiator and its control valve, all contained within a casing, to an externally supplied heat transfer medium, via a flow (14) and a return connection (12). a) Between the external flow connection (14) and the special fitting at the beginning of the radiator (20a), a pipe (18) extends over nearly half the radiator length. b) The special fitting (20a) has at least one opening (24) for the medium to flow into the radiator (100a, 100b), controlled by the valve (104). Further details of the device, its method of manufacture and the preferred flat radiator are claimed.

Description

The invention relates to a method for producing at least sections of Line inserts and / or inner linings, such as connection fittings, Valves or the like according to claim 1.

In known connection devices and in particular in connection devices for a central connection of a radiator valves, blind plugs and the like are used in valve seats, the valve seats in the nozzle of the Connection device must be used. This is usually either soldered or a press fit or the like is used. The related measures are also very complex and expensive. The sealing surfaces, connecting thread etc., with the respective sections of one to be inserted into the valve seat Valve in operative connection must be made extremely clean and can be manufactured and arranged within small manufacturing tolerances. Also this is a major disadvantage of known connection devices and in particular also the connection device discussed above for a middle connected Radiator.

It is the object of the present invention to propose a method which easier production of cable inserts, especially sealing surfaces or valve seats, preferably of connecting devices for radiators.

These objects are achieved by a method with the in claim 1 steps listed solved.

In the solution according to the invention can one Forming tool, which has the desired contours, in a sprayable or to be positioned around a part to be overmolded, in order to then in the Cavities between the mold and the part to be clad at least one Inject plastic layer. After the plastic at least partially is hardened, the mold is removed, the injection mold or the spray mandrel have movable segments that move radially inward prior to spraying to insert the spraying mandrel into the section after inserting to be moved radially outward to form the injection mold, and then to fill the cavity.

In this case, a plurality of plastic layers are advantageously molded on.

Sections of a metallic material can also be injected.

At least two layers of a plastic material are preferred. injected. The plastic layers can be made of plastic of different hardness be and optionally have an intermediate layer, in particular a transition layer between the two plastic layers.

At least one layer of soft can be used in sealing areas Injection molded plastic.

Particular advantages can be achieved here by the method according to the invention, if the valve seat is at least partially characterized by molded sections Plastic materials is made. In particular, the sealing surfaces for this procedure to be used according to the invention is predestined.

The valve seat can, for example, also exclusively or almost exclusively consist of molded plastic materials. A thorn or a Tools for spraying are inserted into the housing and cavities are sprayed out. In doing so, complicated tools can also be used Create shapes, such as undercuts and the like. For such Spreading tools are used for purposes that are in a corresponding Housing of a device introduced according to the present invention and be spread out. Plastic is injected and after the Plastic is at least pre-hardened, the spread tool in its Diameter or its dimensions can be changed so that it from the molded shape or the molded valve seat or the like pulled out can be.

Special advantages also result if the molded surfaces, in particular Sealing surfaces and the like, from two, in particular several layers Plastic are made, with the different plastic layers different Have properties. For example, at least in sections first a layer of hard plastic or hard PVC or the like in a housing of a device according to the present invention inject, whereupon at least in the areas of the sealing surfaces a soft plastic, a rubber coating or the like can be applied could. Between the hard plastic and the soft plastic or the rubber-like Material could improve the adhesion of the two layers to each other still an adhesion promoter or an adhesion-promoting intermediate or transition layer be provided. This can also be created by practically from one type of plastic to the other type of plastic by after completing a hard plastic layer, continuously soft plastic is mixed with the hard plastic until finally almost exclusively or only soft plastic is injected.

For special strength requirements, metal parts can also be used in the plastic be injected. For example, prepositioned and possibly arranged on the injection mold, which can preferably be spread Threaded sleeves or the like can be provided directly or via anchoring members can be injected into a plastic skin.

It goes without saying that the technology for spraying or spraying out certain sections within connection or heating fittings, water pipes and the like, especially in the field of heating technology, has very considerable advantages, since it is no longer required, complicated and to manufacture expensive valve seats and the like from brass in one-off production and to be fastened in a housing by means of complicated and susceptible procedural steps.

Of course, the outside areas of any fittings can also be made of plastic can be injected in this way without complicated machining steps a handsome and resistant to corrosion and the like To form the exterior for the fittings or the device for connection. At Conventional connection devices and the like, however, it is necessary to Chromium plating the outer surfaces and possibly the inner surfaces in order to create a to be able to ensure at least a reasonably appealing appearance. The Chromium plating processes or chromium plating techniques used, however environmentally and also with regard to the health of the staff incompatible that in the foreseeable future the chrome plating of fittings, connection fittings and the like will no longer be possible, or such Work by poorly protected people in developing countries must be carried out.

In addition, the energy consumption during chrome plating is so disadvantageous that the cost of manufacturing fittings is often excessive is made up of the aesthetically conditioned finishing.

Fig. 1

eine Anschlußvorrichtung, bei der das erfindungsgemäße Verfahren einsetzbar ist, teilweise im Längsschnitt und teilweise in einer seitlichen Ansicht;

Fig. 2

die Ausgestaltungsform gemäß Fig. 1 in einer Draufsicht;

Fig. 3

einen Heizkörper, insbesondere einen Plattenheizkörper, der mit einer wenigstens zum Teil erfindungsgemäß herstellbaren Vorrichtung versehen ist;

Fig. 4

einen Heizkörper mit einer erfindungsgemäß hergestellten Vorrichtung, die am unteren Ende des Heizkörpers vorgesehen ist;

Fig. 5

eine Seitenansicht eines Heizkörpers, bei dem das Verfahren gemäß der vorliegenden Erfindung ebenfalls am unteren Abschnitt des Heizkörpers eingesetzt worden ist;

Fig. 6a

einen Ventilsitz der gemäß der vorliegenden Erfindung herstellbar ist, in einem Längsschnitt;

Fig. 6b

einen Ventilsitz mit herkömmlichen Dichteinrichtungen gemäß der vorliegenden Erfindung;

Fig. 7a

ein Gehäuse, in welches ein Ventilsitz bzw. ein Ventil einsetzbar ist mit Anschlußstutzen, teilweise im Längsschnitt und teilweise in einer Draufsicht; und

Fig. 7b

einen Querschnitt durch ein Gehäuse gemäß Fig. 7a, wobei der Querschnitt die Öffnungen schneidet, durch die ein Ventilsitz, insbesondere der Ventilsitz gemäß den Fig. 6a, 6b hindurchgreifen kann.

The present invention is explained in more detail below on the basis of the subsequent description of preferred embodiments with reference to the attached figures. Further advantages and features according to the present invention are disclosed. Show it:

Fig. 1

a connection device in which the inventive method can be used, partly in longitudinal section and partly in a side view;

Fig. 2

the embodiment of Figure 1 in a plan view.

Fig. 3

a radiator, in particular a panel radiator, which is provided with a device which can be produced at least in part according to the invention;

Fig. 4

a radiator with a device according to the invention, which is provided at the lower end of the radiator;

Fig. 5

a side view of a radiator, in which the method according to the present invention has also been used on the lower portion of the radiator;

Fig. 6a

a valve seat which can be produced according to the present invention, in a longitudinal section;

Fig. 6b

a valve seat with conventional sealing devices according to the present invention;

Fig. 7a

a housing in which a valve seat or a valve can be inserted with connecting pieces, partly in longitudinal section and partly in a top view; and

Fig. 7b

a cross section through a housing according to FIG. 7a, the cross section intersecting the openings through which a valve seat, in particular the valve seat according to FIGS. 6a, 6b can pass.

In Fig. 1, the connection device that can be produced according to the invention is particularly for the central connection of a radiator generally by reference number 10 named. The device 10 has an inlet 12 and a return 14, which are both mounted or held in a mounting plate 24. Between the previous and Return connections 12, 14 and housings 20a, 20b connected to them line sections 16, 18 are provided, which the respective housing with the Connect the respective flow and return connections 12, 14.

The line sections 16, 18 together have approximately the length that the Has radiator that is connected to the device 10 shown. Only the mounting distance between the flow and return connection on the Plate 24 is provided, can lead to the two line sections 16, 18 in their total length are shorter than the radiator to be connected, whereby additionally the housing dimensions of the housing 20a, 20b or any Connection piece 22 for fitting a valve seat or a valve (see subsequent figures) with their dimensions can be significant.

In the present case, the housings 20a, 20b each have four openings. On one of the first and second line sections is connected to an opening, for example by means of brazing, welding or by means of Pressing. Two connecting pieces 24 are respectively on the housing 20a and the housing 20b, via which the radiator is connected to the piping system, for example, central heating or the like.

The respective mouth openings of the forward and return are at the respective housings 20a, 20b, an assembly opening 22 is provided which immediately a valve or a blind plug or the like can accommodate or Recording a valve seat or the like can be formed. It can a funnel-like device 21 can be provided within the housing 20a, 20b, such as a reducer, into which a valve seat is soldered with dimensional accuracy or press, but at least can be adjusted.

A valve seat will be necessary because there are sealing surfaces and especially dimensionally stable line cross sections in the housings 20a, 20b hardly or only with have more work done. A valve seat to be used later can be manufacture far cheaper, even if the assembly of the valve seat within the Housing is still relatively expensive.

2 shows the device according to FIG. 1 from a different perspective. Identical or functionally identical parts are represented by means of the same reference numbers. This also applies throughout to the following FIGS. 3 to 7b.

2, the shape of the mounting plate 24 is from a different perspective recognize, in particular the mounting holes or mounting openings 24a become recognizable. The housings 20a, 20b have connecting pieces 24, the free ends of which recognizably have a particularly tapered section. Such one Section is particularly suitable for an arc welding process in which under higher to very high contact pressure by means of current for a short time very high Temperatures are applied that lead to welding, especially without Appearance of a visible weld. It can also be seen that the cylindrical symmetry Axes of the line sections 16, 18, the mounting piece 22nd and the connecting piece 24 in a spanned by the cylinder axes Level.

3 shows a radiator 100a according to the invention with one according to the invention Device 10 (see FIGS. 1 and 2) shown. The radiator can be Fig. 3 both in a plan view and in a view from below equally being represented. In the present case, the heating element 100a has three heating plates 102 on. However, it is also possible to use an appropriate radiator to produce only one heating plate, with two or with four or more heating plates 102. Any other type of radiator can be used in a corresponding manner a connecting device 10 are equipped and thereby the subject of the present invention.

The inlet connection 14 is via the line section 18 with the housing 20a connected. A valve 104 is in the housing 20a directly or via a connecting piece (not shown) inserted or screwed tight. The housing 20a is connected to the heating plates 102 via the connecting piece 24.

On the other connection side, i.e. on the return side, are the relevant ones Heating plates 102 are in turn attached to the housing 20b via connecting pieces 24, wherein a blind plug 108 is provided or screwed into the housing 20b. The housing 20b is connected to the return connection 12 via the line section 16 connected.

A heat transfer medium through the inlet connection 14 in the radiator is initiated, the line section 18 flows along into the housing 20a and is in accordance with the closed or open position of the valve 104 in its Flow inhibited. The desired flow rate runs through the connection piece 24 into the heating plates at one end into the radiator flows through the heating plates through and is on the connecting piece 24 on the opposite Side out again from the radiator 100a. The used or cooled Heat transfer medium flows through the connection piece 24 and the housing 20b and the line section 16 to the return port 12 and back to the Connections 12, 14 adjacent piping system, for example a central heating piping system.

The third heating plate 102 is connected to the connection piece 25 with the invention Connection device connected.

The mounting plate 24 has a size in the present case, which on the Radiator is matched so that the mounting plate is exactly between the welding edges the heating plates can be fitted. In this way, the mounting plate is suitable 24 especially for cases where the radiator is on the mounting plate 24 should stand.

However, the radiator can alternatively or additionally also be stamped Sheets (without reference numerals) on wall brackets or tripods or the like be attached to the wall or to the floor of a room or building. Naturally a heater 100a can also be mounted on the mounting plate 24 via its mounting holes hanging.

The connecting device shown has the particular advantage that no more inlets or outlets can be seen on the side of the radiator 100a are. In addition, the supply and discharge lines of a piping system central heating or the like in a radiator recess in the center or in the center are provided and radiators arranged in the radiator recess regardless of their size, they are always centered in the niche, so that there is an aesthetically convincing impression. In addition, the Housing 20a, 20b are identical, so that a valve 104 and a Blind plug 108 easily interchanged in their assembly position to be able to make any exchanges in this way if necessary when installing the heating piping system of a building, for example Flow and return have been interchanged to be able to compensate.

4 and 5, a heater 100b is shown, which with an inventive producible center connection is provided. The center connection device can be seen located at the bottom of the heater 100b. Otherwise they are correct 4 and 5 components shown with the components of FIG. 1st to 3 match.

6a shows a valve seat as it is arranged in a housing 20a, 20b can be, the respective valve seat 50a or 50b (see Fig. 6b) can be inserted into the housing via the opening 22.

In principle, the valve seat 50a according to FIG. 6a has the inner or outer contours on how they are required to seat the valve seat in a sealed position Use housing 20a, 20b. In addition, the valve seat also has sealing surfaces that seal against a valve to be used.

In the case of the valve seat 50a, molded sealing surfaces 52 are provided, which are sealing Engagement, in particular with the free edges of the connecting portion 21 a Housing 20a (see Fig. 1) can be brought. Furthermore, the valve seat 50a, in the an opening 56 a corresponding valve can be inserted or screwed in further molded sealing surfaces 54a in a sealing engagement with parts of the Housing or the connecting section 21 or also the line section 18 or 16 kick.

It is particularly advantageous if more complicated sections of a connecting piece from the outset by injecting the connection piece into the respective housing 20a, 20b can be provided in the housing. At least the connection piece partially injected into its associated housing can cause any sealing problems do not occur from the outset. In addition, the complicated Manufacture of a valve seat, its sealing surfaces and its flow openings allow only very small tolerances to ensure adequate tightness and on the other hand a predetermined dosage of the heat transfer medium by the Allow valve seat controlled by the valve seated in the valve seat 50a.

6b shows a valve seat 50b, which functions as the valve seat 50a corresponds, but instead of the molded sealing surfaces 52a, 54a according to 6a O-ring seals are provided in the O-ring grooves 52b, 54b. Here can still very significant parts of the valve seat 50b using plastic injection molding techniques have been produced.

If the seals 52a, 54a (see FIG. 6a) are produced by plastic injection molding mechanically loaded parts that have no sealing function, made of hard plastic such as PVC or the like, while the Sections 52a, 54a, which should have a sealing function, from a soft Plastic can be made, with any adhesion promoting or transition layers from a mixture of hard and soft plastic, if necessary with additives. Furthermore, sealing surfaces can also be provided by gumming, vulcanization or the like.

With an inexpensive manufacture of such a nozzle or at any other interior lining of piping or heating fittings or the like preferably injection molds are used which are made of moving elements exist, and in this way also complicated structures allow such as undercuts or the like. Such tools are known in principle to the person skilled in the art, but are due to the heating sector various difficulties not used.

Of course, these techniques can be used instead of internal coatings or Sprayings or additionally outer contours of connection fittings or Manufacture fittings generally in an advantageous manner with plastic, with complex, energy-intensive and environmentally harmful or toxic manufacturing steps can be omitted.

7a, 7b are housings 20a, 20b with connecting pieces 24 and openings 22, 28 for a valve seat or for a respective line section 16, 18 shown. In the openings 22, 28, a valve seat is fitted because of the required control accuracy must have a very precise geometry that corresponds as closely as possible to the geometry of the valve to be fitted.

The described features result in the combination shown, in particular but also in other appropriate combinations, especially with regard to manufacturing technology Advantages and thus also cost advantages. In addition, in Considerable progress has been made with regard to the environmental compatibility of manufacturing technology achieve.

Claims (6)

1. A method for the production at least of sections of pipe inserts and/or pipe linings preferably of radiator connection devices, whereby a moulding tool having desired contours is positioned in a part to be jetted or to be extrusion-coated in order subsequently to inject at least one plastics layer into the cavity or cavities between the mould and the part to be lined and after the at least partial hardening of the plastic to remove the mould, whereby the injection mould or the injection mandrel has movable segments which are moved radially inwards before injection to introduce the injection mandrel into the section, and after introduction are moved radially outwards to form the injection mould in order to subsequently fill the cavity.
2. A method according to Claim 1,
   characterised in that several layers of plastic are gated.
3. A method according to one of Claims 1 or 2,
   characterised in that sections of a metallic material are also injected.
4. A method according to one of Claims 1 to 3,
   characterised in that at least two layers of a plastics material are gated, with the layers of plastic being made of plastic of varying hardness.
5. A method according to one of Claims 2 to 4,
   characterised in that an intermediate layer, in particular a transition layer, is provided between the two or more layers of plastic.
6. A method according to one of Claim 1 to 5,
   characterised in that at least one layer of a flexible plastic is gated in particular in sealing regions.

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