DE19823635A1 - Fabrication of radiator for bathrooms - Google Patents

Abstract

Square distribution pipes (1) and round cross pipes (2) of the radiator are jointed by a press/solder connection. A distribution pipe has stamped and deep-drawn apertures (6) to hold a solder ring, and recesses (7) to accommodate the cross pipes, when the pipes are pressed together. The apertures have central holes. The solder rings are formed to be self-locking after fitting. The connection sections (8) of both ends of a cross pipe are upset for a precise fit into the recesses, and are deburred at the same time.

Description

The present invention relates to a method for Manufacture of a radiator using an Press / solder connection.

The following are comments on the technological background given:

In the bathroom area are often special for design reasons shaped radiators used. These radiators have z. B. Square tubes as manifolds and round tubes as Cross connectors as basic elements. These basic elements are in the shape of a ladder with more or less large distances of the individual rungs made to each other. The so Radiator shapes created have been very popular for several years successfully sold in the bathroom area.

These radiators not only have an aesthetic shape and thereby contribute to the design of the bathroom, but they also have a practical function by going to Drying towels can be used.  

The manufacture of these radiators is currently in executed in different ways. So z. B. in Square tubes that have been cut to the appropriate length, Openings made on one long side, in or on these Round tubes with appropriate dimensions can be attached. The In one embodiment, fastening takes place in such a way that a hole is punched or drilled in the square tube in which the prepared round tube in a corresponding Distance is inserted so that it is in the opening of the Square tube protrudes. After positioning the Round tube in the hole of the square tube, the round tube with the Square tube connected. The connection happens either through Welding or by soldering. Will the two pipes welded, so arises around the connection point at the Outside of the round tube or the square tube one Weld seam, which naturally does not run evenly. The has the disadvantage that the welds often need to be treated. This creates additional ones Manufacturing costs that have an adverse effect. Furthermore is even with conscientious processing no uniform To reach the surface in the connection point.

The previously described possibility of connecting between Square tube and round tube is also given if that Round tube is larger in its outer diameter than the hole in the square tube. In this production, the round tube is over a device at the appropriate place on the square tube placed so that the opening of the tube is exactly on the hole in the Square tube is placed. The round tube thus arranged is now connected to the square tube. Again, this can either done by soldering or welding. When welding basically the same problems occur as before with the first Embodiment of the radiator.

To take into account the fact that the surface at Welding becomes uneven, another method has been developed designed to connect the pipes. With this procedure the holes in the square tube are also made first,  and then the back of the square tube of length after slotted. This slot is widened so that it is possible from the back, i.e. from the inside of the Tube to the connection point of the square tube with the Round tube to arrive. Now all round tubes with the Square tube welded, and then that Square tube bent back together and lengthways allocated. This manufacturing technique has the advantage that Connection point between round tube and square tube one has a clean impact and no bumps. The disadvantage with this method, however, is an enormous effort must be driven to achieve this smooth surface.

Another way of connecting the Distribution tube, which is preferably designed as a square tube is and the cross tube, which is designed as a round tube in that the connection is carried out as a soldered connection. In In this case, the cross tubes are inserted into the Holes of the two distribution pipes at the appropriate depth introduced and brazed. The second possibility of Brazing is that the cross tubes in Outside diameters are larger than the diameter of the holes in the two distribution pipes, and the cross pipes using one Push the device onto the distributor pipe and after appropriate positioning are soldered.

It is with the soldering methods just described previously necessary to use flux to ensure the flow of the Lots to ensure the connection between the Distribution pipe and the cross pipe is absolutely tight. To do this correspondingly large amounts of flux and solder are required.

The invention is based on the object of a method develop that a connection between the square tube and allows the round tube, the surfaces of the round tube and the square tube in the visible area of the The junction remains smooth, no flux  is required and the workload is significantly reduced is.

This task is carried out by the in the hallmark of the independent Claim specified feature solved.

Based on a possible embodiment, the present Invention explained in more detail.

To find an optimal connection between the preferably as Square-shaped manifold and preferably Achieving a cross tube designed as a round tube are in the Manifold holes punched, which are then deep drawn become. The deep drawing has the task of the edge of each To shape holes so that they can accommodate a so-called Solder ring and then suitable for holding the cross tube is. The deep-drawn hole therefore has a double step Press fit. It is from the outside of the manifold seen a first deep impression arranged in the Manufacture of the radiator, the cross tube is pressed. To the When looking at the center of the hole, there is one at the bottom of this impression shaped as a ring area of the manifold, which in turn has a recess on the inside, which is similar in shape to the first depression. This second deepening differs from the first deepening in the way that the embossing depth is significantly less than in the first. This second recess serves to accommodate the Solder rings, and - like the first recess on their bottom seen towards the center of the hole a ring-shaped Remaining material of the distributor pipe in which in its Center of the breakthrough of the hole in the manifold is arranged.

The length of the manifold to be machined is included freely selectable. The length of the cross tube is also executable as desired. The lengths of the pipes needed, so both the manifold and the cross tube, play with  the processing of the corresponding number arranged Holes in the manifold do not matter.

The individual cross tubes, preferably as round tubes are sawn to the appropriate length and compressed at both ends to an exact fit. The Compression takes place in such a way that the pipe on its Outside radius according to the fit in the deep-drawn hole the manifold is tapered, at the same time a Deburring takes place at the intersection of the cross tube.

To assemble the radiator, two manifolds, in the punched and deep-drawn holes are made with Solder rings equipped in the inner recesses. The Solder rings are shaped so that they are biased and when inserting in the intended imprint by their Resilience. The two with solder rings provided manifolds are now positioned so that the two sides with the arranged holes each opposite. This positioning happens on one Device on which the cross tubes are then placed become. For the cross tubes are at an appropriate distance Position points arranged so that they come to rest, that when pushing the two manifolds together against each other the cross tubes with the two manifolds be pressed. The pressing is done by both Manifold pipes against the longitudinal axes of the cross pipes, which on the the exact dimension of the deep-drawn hole has been compressed, are pressed together until they fit and result in a firm connection. Because of this pressing Construction of the radiator so stable that the Radiator in a corresponding storage facility for Example of a lattice box can be stored. Through the fixed The radiator remains in shape and can sit in the compression now be soldered.

The radiator is now soldered to one Conveyor device that leads into a heating furnace. Of the  Soldering process takes place in that the radiator at Pass through the oven is heated evenly and the inserted solder ring melts and by capillary action between distributor pipe and cross pipe around the end of the Cross tube runs evenly. Due to the high Accuracy of the cross tube with the punched and deep-drawn hole of the distributor pipe it is guaranteed that the molten solder evenly around the circumference of the Cross tube is distributed.

An important factor in this type of soldering process is that no flux is required for this soldering process. The reason there is a special alloy of the solder ring, as well as the Soldering in the oven under protective gas. Likewise, none of them Preparatory work for surface cleaning, such as B. Grease with toxic solvents (chlorinated rivets, hydrocarbon) or Chemicals (caustic soda or sulfuric acid). The solder joint can be soldered completely untreated. Thus arise no toxic and environmentally harmful vapors or residues, polluting the air or water. The same goes for the Workers who assemble the radiators. The heater can So without additional suction or filter devices in one Assembly hall are set up and operated.

To protect against oxidation at the solder joint during the Soldering process is a mixture of in the oven Hydrogen nitrogen in an appropriately dosed amount fed. This feed-in even leads to a reduction (Redox) possible oxidation on the surface achieved.

Another advantage of soldering using an oven consists in heating the radiator evenly, and so no stresses occur in the material Differences in temperature are caused. After the run In the heat chamber of the furnace, the radiator becomes a second Zone of the soldering device cooled evenly. Through this the radiator keeps its shape without even cooling  that he has any tension in the material that otherwise usually occur when soldering or welding.

After the cooling process comes the prefabricated radiator back out of the soldering system. Then he will be back in a storage facility and can be stored after complete Cooling can be processed further.

This finishing will be at the ends of the two Manifold end caps attached so that the radiator now forms a closed system. In these four End pieces are now connections for the inlet and the Drain as well as for the vent valve and a blind plug used. Subsequently, the finished form Radiators with a test pressure of approximately 10 bar Tightness checked. Then he can continue to treat his Surface the corresponding surface treatment process be fed.

With the present invention it is now possible to Manufacture of such a radiator much easier and produce more environmentally friendly. It is just that it is crucial that the present invention the solid assembly of series manufactured pipes allows, already at put together the necessary amount of solder in the form of a ring on the required place is introduced. Due to the high Fitting accuracy is also a very small amount when soldering required by Lot. So z. B. with today's methods 10- to 15 times the amount of solder needed, which is comparatively in the present invention is necessary to have a stable and tight connection between the manifold and the Ensure cross tube.

Another advantage of the present invention is that no post heat treatment is required to Relax radiator. An additional one is therefore unnecessary  Energy expenditure to relieve tension, such as during welding or Soldering are common to eliminate.

Through the firm connection after pressing the two Manifolds with the cross tubes also result in a clean one Transition surface between the distributor pipe and cross pipe. The means there is no weld or solder seam visible, one Surface change of the distributor pipe or the cross pipe would result from material application or fusion. Consequently with these processes, clean edges on the Transition point between the distributor pipe and cross pipe both to ensure outside as well as inside. Corrosion from the inside the connection points (crevice corrosion) is complete locked out.

Based on the drawings showing an embodiment of a Represent radiator by the method described was produced, the structure of the radiator is closer explained.

It shows:

Fig. 1: the representation of an embodiment of a heating body.

Fig. 2: a manifold with holes arranged for receiving the transverse tubes,

FIG. 2.1 is a plan view of the stamped and deep-drawn hole in the manifold,

Fig. 3 shows a cross-tube which is compressed at its two ends and deburred

FIG. 4 shows a section through the described connection point between the manifold and the cross tube after the soldering process,

Figure 5: process the same section as in Figure 4 prior to soldering..

Fig. 6: a section through a distributor pipe into the center of the die-cut and deep-drawn hole with an inserted solder ring,

Fig. 7: the illustration of Fig. 6 without solder ring.

The illustration in FIG. 4 shows a distributor pipe 1 in which a cross pipe 2 is inserted. In this illustration, a section through the distributor pipe 1 is shown in the center of the hole 5 , into which the cross pipe 2 is inserted. At the connection point between the distributor pipe 1 and the cross pipe 2 , the solder 4 fills the contours of the cavities. These cavities are filled when the solder ring 3 is heated in the soldering furnace, in which it is heated above its melting temperature and flows into the cavity between the distributor tube 1 and the cross tube 2 on the basis of the capillary action.

In FIG. 5, the same interface as in FIG. 1 is shown, but here the connection between manifold 1 and crossbar 2 are not yet soldered. As a result, the solder ring 3 can be seen inserted in the depression 5 provided for it. The cross tube 2 stands on the indentation provided in the distributor tube. Due to the compression of the cross tube 2 at its end, which is inserted into the hole 5 of the distributor tube 1 , it is already stably connected to the distributor tube on the wall of the hole 5 after being pressed in.

Again, the Fig. 6 shows a section through the manifold in the center of the hole 5 with inserted solder ring 3 which is clamped by its bias by the insertion into the recess 6 provided for it. The deepening 7 produced by deep drawing for receiving the cross tube lies from the center of the distributor tube outwards and then over the deepening 6 for the soldering ring. The hole 5 , which represents the breakthrough through the outer wall of the distributor pipe, can then be seen from the recess 6 inwards. The water for the radiator later flows through this hole during operation.

In Fig. 7 is a section, in turn, is shown through the manifold 1, the depressions 7 and 6 and the hole 5 are shown seen from the outside to the inside.

FIG. 2 shows a schematic illustration of a distributor tube 1 with holes 5 arranged therein and the depressions 6 and 7 made by deep drawing for receiving the solder ring 3 and the cross tube 2 .

Fig. 2.1 shows a top view of the hole 5 with the recesses 6 and 7 being inserted into the recess 6 of the solder ring 3, which is lower to the material thickness of the solder ring 3 and the recess 7, and then pressed the cross tube 3 in the becomes.

FIG. 3 shows a cross tube 2 is press-fitted into the recess 6, 7 of the manifold 1 at its two ends in the connecting area 8, wherein the cut end of the transverse tube 2 is deburred by the compression at the same time.

The illustration in FIG. 1 is divided into two and shows in its left half in a radiator of a possible embodiment of the type described above. In this case, two distribution pipes 1 are visible, are inserted into the transverse tubes 2. The individual parts of the radiator are shown in the right half. Holes 5 are shown therein, which have depressions 6 and 7 , into which cross tubes 2 are inserted with their connecting areas compressed at the ends. Furthermore, cover plate 9 with vent valve 10 and blind plug 11 and connections for the inlet 12 and the outlet 13 are arranged in both halves of the illustration.

It is important in the present invention that the hole 5 with its depressions 6 and 7 corresponds to the shape of the cross tube and the required solder ring in order to enable the connection in the manner between the distributor tube 1 and the cross tube 2 .

The present invention thus described has the advantage that the radiator can be manufactured without flux and with simple steps. This manufacturing process does not cause any pollution of the environment by chemical substances, which must necessarily be added to the flux in order to achieve a high quality of the solder connection. The manufacturing process thus ensures a clean and stable connection between the distributor pipe 1 and cross pipe 2 . The connection through the punched and deep-drawn hole in the distributor pipe 1 and through the compression of the cross pipe 2 at both ends in the connection area 8 which is inserted into the recess 6 of the distributor pipe 1 , there is a high mechanical strength of the resulting radiator before soldering. Due to this high strength, the radiator can be stacked on a storage trolley and then placed on the conveyor system of the soldering furnace without fear of impairing or changing the shape of the radiator.

When passing through the radiator through the heater Soldering system, the solder ring is heated above its melting point, and runs due to the capillary action between the Distributor tube and the cross tube evenly in the existing Cavity between these two pipes. By the even Heating of the radiator and subsequent even Cooling of the radiator also creates no tension the pipes and therefore there is no after-treatment Heat necessary to relax the radiator. After subsequent completion by closing the Distribution pipes and attachment of the corresponding  The radiator is ready for connection Surface treatment and can be the next Work step are fed.  

Reference list

1

Manifold

2nd

Cross tube

3rd

Solder ring

4th

Lot

5

hole

6

Deepening for solder ring

7

Recess for cross tube

8th

Connection area

9

End cover

10th

Vent valve

11

Blind plug

12th

Intake

13

procedure

Claims (9)

1. A method for producing radiators, characterized in that distributor pipes ( 1 ) with cross tubes ( 2 ) are joined together using a corresponding press / solder connection. 2. The method according to claim 1, characterized in that the distributor pipe ( 1 ) has depressions ( 6 ) for receiving solder rings ( 3 ) and depressions ( 7 ) for receiving cross tubes ( 2 ) when pressing the tubes together, central in the Wells ( 6 ) holes ( 5 ) are arranged. 3. The method according to claim 1 or 2, characterized in that the cross tube ( 2 ) at its two ends in the connecting area ( 8 ) to the exact fit for the recess ( 7 ) in the cross tube ( 1 ) is compressed and deburred at the same time. 4. The method according to any one of the preceding claims, characterized in that the solder ring ( 3 ) is shaped such that it is itself tightly stuck after introduction into the recess ( 6 ). 5. The method according to any one of the preceding claims, characterized in that the solder is introduced in the form of the solder ring ( 3 ) before the tubes are joined together at the soldering point. 6. The method according to any one of the preceding claims, characterized in that the radiator formed by two manifolds ( 1 ) and a corresponding number of cross tubes ( 2 ) by inserting the solder ring ( 3 ) into the recess ( 7 ) and then pressing the two manifolds with the Cross tubes through the connection point ( 8 ) of the cross tube ( 2 ) into the recess ( 7 ) of the distributor tube ( 1 ) mechanically fixed for further processing receives its original shape. 7. The method according to any one of the preceding claims, characterized in that the heating element is soldered by heating the heating element above the melting temperature of the solder rings ( 3 ). 8. The method according to any one of the preceding claims, characterized characterized in that after heating the radiator controlled even cooling takes place that Tension in the radiator prevented. 9. The method according to any one of the preceding claims, characterized characterized in that the connection points complete with solder are filled in and therefore have no tolerance gaps, corrosion or crevice corrosion cannot occur.