DE29705694U1 - Convector, convector blank and convector kit - Google Patents

Description

27 March 1997 -1- BCK-38-DE

Vogel & Noot Heat Technology Ltd.
Grazerstrasse 1, 8661 Wartberg (Austria)

Convector, convector tube and convector kit

The invention relates to a convector according to the preamble of claim 1 or according to the preamble of claim 14. Furthermore

The invention relates to a convector kit according to the preamble of claim 21 and a convector blank according to the preamble of

Claim 12.

Convectors of the type described above are known in various designs; these convectors usually have horizontally running heating channels or heating pipes through which the heating fluid flows. The top heating channel is usually connected directly to the flow of a valve assembly and the bottom heating channel to the return of a valve assembly. A single-layer convector with two collecting channels is known from CH-PS 654100, which are connected to the flat tubes via sleeves on one side of a heating panel formed by flat tubes. The collecting channels have connections for supply and discharge lines for the heating fluid. A two-layer radiator known from CH-PS 654 100 has two collecting channels, each of which is connected to the flat tubes via sleeves on its opposite wall surfaces. The collecting channels have connections for the heating fluid lines on the sides.

The aim of the invention is to create a stable and simply constructed and easy to manufacture convector, whereby convectors with different structures can be created from a small number of basic components.

These objectives are achieved according to the invention in a convector or a convector kit or a convector blank of the type mentioned at the outset by the features stated in the characterizing part of claims 1, 12, 14 or 21.

When creating a convector according to the invention, the heating channels are first formed in a panel or heating pipes are assembled with collecting channels to form the desired panel shape. Then, sleeves are advantageously attached or welded to the heating channels or heating pipes on a wall surface and a collecting channel is attached or welded to the sleeves in a fluid-conducting manner, so that a stable panel with collecting channels attached to the heating pipes in a fluid-conducting manner is created. In principle, when producing a convector or convector blank, the procedure can also be such that the sleeves are first attached or welded to the collecting channels (pipes) and then the unit consisting of the collecting channel and sleeves is connected to the respective heating channels or heating pipes.

An alternative advantageous way of producing a panel is to attach sleeves and collecting ducts not only to one surface, but to both surfaces of each heating channel or pipe, preferably at the same time, thus creating a panel that can be combined with another panel to form a convector.

Convectors can be assembled from these two types of panels by attaching or welding valve sets to the collecting channels in a fluid-conducting manner. The heating fluid is fed into the collecting channel via the valve set, from the collecting channels the heating fluid enters the corresponding heating channels or heating pipes through the sleeves; the heating fluid exits the collecting channel located there via the sleeves arranged in the other end area of the respective heating channel or pipe and flows back to the return connection of the valve set via at least one further heating channel or heating pipe, which has been designed or separated or saved for this purpose in terms of flow.

Such heating panels can be connected to one another in any number using the valve fitting and using pipes and/or T-pieces, so that convectors can be assembled with any number of heating panel layers.

An essential feature of the invention is that individual panels can be manufactured whose individual heating channels or pipes are connected to two collecting channels via sleeves on both surfaces and that these convector blanks produced in this way can be stored and made available for the later assembly of convectors.

A significant advantage of the invention is that the valve assembly, which can be easily connected to the collecting ducts, is integrated into the convector and thus, in particular multi-layered convectors with a thermostatic valve can be created, whereby the thermostatic valve is not located in the area of the on-site heating fluid supply line, but in the usual place of a convector, namely in the upper side area.

Particularly advantageous structural designs for two or more than two-layer convectors can be found in claims 5 and 7. By arranging the collecting ducts on the respective wall surface of a panel, the individual panels can be connected particularly easily, quickly and durably. The installation of the valve set is also quick and easy.

In the following, the invention is explained in more detail using the drawing.

Fig. 1 shows a section through a single-layer convector, Fig. 2 shows a section through a two-layer convector. Fig. 3 shows a front view, Fig. 4 a section and Fig. 5 a top view through a two-layer convector, similar to the convector shown in Fig. 2. Figs. 6, 7 and 8 show a top view, a section and a front view through a three-layer convector with a low installation height, Fig. 9

shows a convector blank, Fig. 10, 11 and 12 views of a convector with vertical heating channels or pipes and Fig. 13, 14 and 15 elongated sleeves or their use.

According to Fig. 1, a number of flat, essentially horizontal heating pipes 2 are arranged one above the other and, as can also be seen in Fig. 3, are each connected in their lateral end areas to sleeves 4, which in turn are connected in a fluid-conducting manner to a collecting channel 3. In principle, more sleeves 4 or a single elongated sleeve 4' with the longer diameter vertically assigned (Fig. 13, 14, 15) can also be provided. These two collecting channels 3 arranged in the lateral end areas of the heating pipes 2 are in the present case each connected to each of the heating pipes 2 by means of two sleeves. The heating panel 5 formed by the collecting ducts 3, the heating pipes 2 and the sleeves 4 is provided as a fully assembled unit or blank with a valve set 7 and then represents a usable convector. The valve set 7 is always connected to the wall of the collecting duct 3 that is remote from the heating duct.

The valve fitting 7 is of a conventional design and has a connection 14 for a supply pipe provided by the customer (Fig. 3). The heating fluid is fed from the connection 14 to an upper fitting of the valve fitting 7 with a supply opening 21 via a supply line 14' of the valve fitting 7, whereby a valve seat 13 for a valve 20, in particular for a thermostatic valve, is formed in the upper fitting to regulate the flow of the heating fluid. Heating fluid is thus fed to the collecting channel 3 in a controlled manner via the valve 20. The heating fluid is distributed into the heating pipes 2 via the sleeves 4 connected to the collecting channel 3. A separating device 11 inserted into the collecting channel 3 on the right in Fig. 3 ensures that the heating fluid fed in can only enter the two heating pipes 2 at the top; from these, the heating fluid enters the upper section of the left-hand collecting channel 3. In this collecting channel 3, the heating fluid flows downwards into the two heating pipes 2 located below, passes through these from left to right, flows over sleeves 4 into the lower area of the right-hand collecting channel 3, exits from this through the return opening 22 into the lower fitting of the valve set 7 and through the return connection 15 of the valve set 7 into a return pipe provided by the customer.

The fluid distribution or flow in the convector can also be designed in any other way, for example by only flowing through one heating pipe 2 in one direction and the heating pipe below it in the opposite direction. The flow path is specified accordingly by inserting appropriate separating devices 11. The specialist is free to design the flow path through a panel or the panels of multi-layer convectors according to his wishes and circumstances.

The choice of two sleeves 4 instead of a single sleeve 4' or a bend 4" to connect each heating pipe 2 with each of the collecting channels 3 is

advantageous because it ensures better heating fluid flow or better ventilation and makes emptying the convector easier. In Fig. 13 and 14, sleeves 4 ¹ are shown which are elongated and can be used instead of two separately arranged sleeves 4. Due to the elongated opening cross-section, these sleeves 4' also enable emptying and venting. The sleeve 4' shown in Fig. 13 is an independent component as shown in Fig. 15. The sleeve 4" shown in Fig. 14 is an integral component with the panel or flat tube 2 and is manufactured by bending, which only needs to be connected to the collecting duct 3. The length of the sleeve 4' or bend 4" is between half and the entire height of a duct or flat tube 2.

The heating pipes 2 and collecting channels 3 used can be flat pipes, oval pipes, round pipes, rectangular pipes, etc. In the present invention, it is not the shape of the heating pipes 2 or the collecting channels 3 that is important, but the attachment and arrangement of the collecting channels 3, which are only connected to the valve assembly 7 after they have been connected to or fastened to the heating pipes 2.

Fig. 2 shows the possibility of creating a two-layer convector from two heating panels 5 as shown in Fig. 1. After a number of heating pipes 2 have been connected to two collecting ducts 3 each via sleeves 4 or 4 ¹ , two such panels 5 are combined by means of a valve assembly 7 to form a two-layer convector. For this purpose, the two mutually facing supply openings 21 and the mutually facing return openings 22 of the valve assembly 7 are connected to a pair of mutually opposite collecting ducts 3. The other pair of collecting ducts 3, which is located away from the pair of collecting ducts 3 connected to the valve assembly 7 or in the other end area of the convector, can remain unconnected or is connected by pipes and/or T-pieces 8, 10 as shown in Fig. 5 or 6. The connection is made with T-pieces 8 in the upper area of a collecting channel 3 to enable ventilation; in the lower area, such a connection is made with a T-piece 8 to provide the possibility of emptying. The pipe pieces 10 serve to connect the collecting channels 3 in a fluid-conducting manner. The pipe and/or T-pieces 8, 10 are advantageously always connected to the collecting channels 3 and not directly to the flat pipes 2.

The vent assembly 7 can, as indicated in the case of welding sleeves 24, have different depths. The length of the pipe and T-pieces 8, 10 is adapted to this depth. In order to absorb the welding pressure during welding, support components 9 can be arranged in the collecting channels 3, which prevent deformation of the collecting channels due to the welding pressure. Such support components can also be arranged in the flat pipes 2 in order to absorb the pressure during welding with the sleeves 4, 4' or the bends 4".

In principle, it is also possible to connect the flow opening 21 of the valve assembly 7 to just one collecting channel 3 of a pair of opposing collecting channels 3 and the return opening 22 of the valve assembly 7 to the same collecting channel 3 or to the opposite collecting channel 3. The appropriate fluid flow through this two-layer convector is ensured by appropriate arrangement of separating devices 11 or by appropriate connection of the collecting channels 3 located far from the valve assembly 7 by means of pipes and/or T-pieces 8 or 10. However, valve assembly 7 is advantageously used which has two opposing flow openings 21 and two opposing return openings 22, whereby both openings 21, 22 are connected in a fluid-conducting manner to the respective collecting channels 3 of a pair in the upper area and in the lower area.

In general, reference is made to Fig. 5 to the effect that fins 6 of any design can be arranged between the individual heating tubes 2 in order to increase the efficiency of the convector.

According to the invention, the possibility is also provided of connecting collecting channels 3 to heating pipes 2 not only on one side via sleeves 4, 4', but also of connecting two collecting channels 3 to one and the same heating pipe 2 on both wall surfaces, in particular in its two end areas, and opposite one another with respect to the heating pipe 2, via two sleeves 4 and/or one sleeve 4'. A panel 5a of this kind, as shown in the middle of the convector in Fig. 6, is used to create convectors with more than two layers or can be provided as a convector blank. In addition to such a panel 5a or convector blank, panels 5 are used which are arranged in front of and/or behind the panel 5a, thus creating a two- or three-layer convector. To create convectors with more than three layers, several panels 5a can be provided or connected to one another via pipe and/or T-pieces 8, 10 and covered at the front and/or rear with a panel 5. Fig. 9 shows a section of such a convector blank, in which collecting channels 3 are attached in a fluid-conducting manner on both sides of flat tubes 2 via sleeves 4.

However, even with such multi-layer convectors, only one valve assembly 7 is required, which is connected to any pair, preferably of front panels, of mutually opposite collecting ducts 3, as can be seen from Fig. 6. Again, the flow direction of the heating fluid is determined by corresponding separating devices 11 (Fig. 7). The pairs of collecting ducts 3 located far from the valve assembly 7 are connected by corresponding pipe sections 10 or T-pieces 8 in order to design the flow through the panels 5, 5a as desired or as favorably as possible.

The number and dimensions of the heating pipes 2, which are enclosed by the individual panels 5 and 5a, can be varied as desired. The only thing that needs to be done is to adapt the height of the valve set 7 to the respective height of the collecting ducts 3. This can be done in a simple manner by cutting the flow line 14' of the valve set 7 to the appropriate length.

It is certainly possible to provide convectors in which the heating pipes 2 do not run horizontally but vertically; in this case the collecting channels 3 run horizontally. In terms of concept, this does not result in any changes, since in such convectors the vertical heating pipes 2 are connected to two collecting channels 3 each via sleeves 4, 4', and the collecting channels 3 are connected to the valve fitting 7 in a corresponding manner.

Fig. 10 shows such a convector in front view, Fig. 11 in side view and Fig. 12 in top view. It is understandable that convector blanks can also be created in which the heating channels or pipes 2 run vertically and the collecting channels 3 run horizontally.

In Fig. 10, 11 and 12 a two-layer convector is shown, in which the flat tubes 2 run vertically and the collecting channels 3 run horizontally. The convector comprises two panels 5, in which each flat tube 2 is connected to a collecting channel 3 via two sleeves 4, in particular in the upper and lower end areas. The valve assembly is again arranged to run vertically and is connected to at least one of the two collecting channels 3 located below and to at least one of the two collecting channels located above via corresponding flow and return openings 21, 22. The valve assembly 7 is again connected to the wall surface of the collecting channels 3, which surface faces away from the flat tubes 2. The valve fitting and any pipe and/or T-pieces 8, 10 provided thus hold the flat pipes 2 over the collecting channels 3. In this embodiment, too, corresponding separating devices 11 can be provided in order to achieve a desired flow through the convector.

By appropriately cutting the flow line 14', the usual standard valve fittings 7 can be adapted to the height of the convector. Such convectors are also manufactured in such a way that a flat tube 2 is connected to a collecting channel 3 via a sleeve 4' or at least two sleeves 4 at the same time, i.e. in a single pressure welding step.

In all convectors according to the invention, it is possible to connect the valve assembly 7 via one or two flow openings 21 and one or two return openings 22 to one or two collecting ducts 3 each; in the case of multi-layer convectors, it is preferable to always connect two collecting ducts 3 to the respective two openings 21, 22.

Instead of heating panels 5 and 5a, which are made up of a number of flat tubes 2 that are held together by the sleeves 4 and the collecting channels 3 to form a heating panel 5, 5a, a one-piece plate-shaped panel can also be used. Instead of the heating tubes 2, the panel has channels formed by beading and/or welding that are not connected to one another but are only connected to the collecting channels 3 by the sleeves 4. Such a panel with four channels (not shown) corresponds, for example, to the panel with the four flat tubes 2 according to Fig. 3, if this had been manufactured as a one-piece component. Such heating channels and heating tubes are completely equivalent with regard to the connection of the collecting channels 3 and the valve assembly 7 and the selectable flow.

When producing the convectors or the panels 5 and 5a, one sleeve 4' or two sleeves 4 are advantageously (press) welded to a wall surface of the heating pipe 2 and to a collecting channel 3 at the same time. The collecting channels 3 facilitate the welding process in terms of the current strengths and pressures to be used during welding and also represent the holders for the heating pipes 2. In addition, welding a valve fitting 7 to the collecting channels 3 is relatively easy and the significant advantage is achieved that conventional valve fittings 7 can be used together with conventional flat pipes 2. According to the present invention, it is achieved for the first time that conventional (flat) pipes in the usual dimensions can be easily combined in a variety of ways with conventional valve fittings, in particular valve fittings with thermostatic valves.

The connection of the collecting channels 3 to the heating pipes or channels 2 is made in such a way or at such a distance from the ends of the heating pipes 2 that when the panels 5, 5a are arranged opposite one another, the collecting channels 3 are opposite one another.

The valve assembly 7 has in its upper fitting the valve seat 13 for the thermostatic valve 20 and two flow outlet openings 21. The upper fitting is connected via the flow line 14' to the lower fitting, which has the flow connection 14 and the return connection 15 as well as two return openings 22.

According to the invention, a kit is thus also created which has at least one panel 5a with two collecting channels 3 on each of the two opposite surfaces and comprises at least one panel 5 which is provided with two collecting channels 3 on one side. By connecting these components accordingly, multi-layer convectors can be created by inserting pipe sections and/or T-pieces 8, 10, a valve set 7 and, if necessary, a corresponding number of separating devices 11 in the corresponding place.

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Advantageously, the collecting channels 3 already have prefabricated recesses at the points where the supply and/or return openings of the valve assembly 7 and/or the sleeves 4, 4' are to be connected.

The ends of the heating pipes 2 and the collecting channels 3 are closed at the front, e.g. welded, pressed, soldered, glued or sealed fluid-tight with insert parts.

The heating panels are held together or in position via the collecting ducts 3 or the valve fitting 7 and/or the pipes or T-pieces 8, 10 and/or other connecting means! e.g. holders, welded pieces.

Sleeves 4' according to Fig. 15 can be used as an alternative instead of two sleeves 4. However, it is also possible to provide bends or outward bends 4" according to Fig. 14 as an alternative or instead of the sleeves 4' according to Fig. 15 or according to Fig. 16 instead of one (in this case the bend 4" is correspondingly smaller in size) or instead of both sleeves 4. Such bends 4" can be formed on the heating channels or pipes 2 and/or on the collecting channels 3. Either opposite bends 4" are then welded or the respective bend 4" is welded to the other component 2 or 3. When using such bends 4", great stability and ease of manufacture are achieved, particularly in the case of panels 5a or convector blanks provided with collecting channels 3 on both wall surfaces. When using 4" bends, the manufacturing process according to the invention is deviated from, without, however, losing the design advantages of the invention.

Claims (21)

Expectations: 1. Convector comprising a heating panel (5) or a number of heating panels (5, 5a) arranged in multiple layers, wherein the heating panel(s) is/are divided into preferably horizontally running heating channels and/or comprises a number of preferably horizontally running heating pipes, preferably flat pipes, wherein, in particular in the end regions of the heating channels or pipes (2), collecting channels (3) for supplying and removing fluid to and from the heating panel(s) are connected to the heating panel(s) in a fluid-conducting manner, and wherein each individual heating channel and each individual heating pipe (2) is connected to at least two collecting channels (3) via sleeves (4),
characterized, that in a single-layer convector with horizontal heating ducts or pipes (2), the flow and return openings (21, 22) of a valve assembly (7) having a valve seat (13) for a valve (20) and connections (14, 15) for flow and return pipes provided by the customer are connected to one of the two vertically running collecting ducts (3), or that in a single-layer convector with vertically running heating ducts or pipes (2), the flow and return openings (21,22) of this valve assembly (7) are connected to different ones, i.e. each to a different one of the two horizontally running collecting ducts (3), or that in a multi-layer convector with horizontal heating channels or pipes (2), the flow opening (21) is connected to one collecting channel (3) of a pair of vertically extending collecting channels (3) arranged opposite one another on opposing heating panels (5, 5a) and the return opening (22) of the valve assembly (7) is connected to the same or the other collecting channels (3) of this pair, or both a flow opening (21), in particular in the upper region of the collecting channel (3), and a return opening (22), in particular in the lower region of the collecting channel (3), are connected to each of the collecting channels (3) of this pair of collecting channels (3). or that in a multi-layer convector with vertically running heating channels or pipes (2), the supply opening(s) (21) of the valve assembly (7) is connected to the pair of or to one of the horizontally running collecting channels (3) arranged opposite one another on opposing heating panels (5, 5a) and the return opening(s) (22) of the valve assembly (7) is connected to the other pair of or to one of these collecting channels (3). 2. Convector according to claim 1, characterized in that a thermostatic valve is provided as the valve (20). 3. Convector according to claim 1 or 2, characterized in that separating devices (11), e.g. separating surfaces or plates, are designed or inserted or welded in to set the desired fluid flow direction and paths in the collecting channels (3) and/or heating channels or pipes (2). 4. Convector according to one of claims 1 to 3, characterized in that each of the two collecting channels (3) is connected, preferably welded, to the respective heating channel or pipe (2) via at least two sleeves (4), ie at least two sleeves (4) or one elongated sleeve (4') for the fluid flow or at least two sleeves (4) or one elongated sleeve (4 ¹ ) for the fluid return. 5. Convector according to one of claims 1 to 4, characterized in that in a two-layer convector two heating panels (5), each of which is connected to two collecting channels (3) on one surface of the heating channels or pipes via sleeves (4, 4'), are arranged opposite one another with their surfaces carrying the collecting channels (3), and that in the case of horizontal heating channels or pipes (2), one pair of the two pairs of opposite collecting channels (3) is fluidically connected, preferably welded, to the supply and/or return opening(s) (21, 22) of the valve assembly (7), and in the case of vertical heating channels or pipes (2), one pair of the two pairs is fluidically connected, preferably welded, to the supply opening(s) (21) and one pair to the return opening(s) (22). 6. Convector according to claim 5, characterized in that the pair of collecting channels (3) arranged in the region of the convector remote from the valve assembly (7) or the ends of the collecting channels (3) remote from the valve assembly are connected in a fluid-conducting manner by means of pipes and/or T-pieces (8, 10), preferably in their upper and lower regions. 7. Convector according to one of claims 1 to 6, characterized in that in the case of a more than two-tiered convector, a number of heating panels (5, 5a) are connected to one another, of which at least one panel (5) is connected, preferably welded, to two collecting channels (3) in a fluid-conducting manner on only one surface of the heating channels or pipes (2) via sleeves (4, 4'), and of which at least one panel (5a) is connected, preferably welded, to collecting channels (3) in a fluid-conducting manner on both surfaces of the heating channels or pipes (2) via sleeves (4, 4'), and that in the case of horizontal Heating channels or pipes (2) each collecting channel (3) of only a single pair of opposite collecting channels (3) of the opposite panels (5, 5a) is fluidically connected, preferably welded, to the flow and/or return opening(s) (21, 22) of the valve assembly (7) or that in the case of vertically arranged heating channels or pipes (2) one pair of opposing collecting channels (3) is fluidically connected, preferably welded, to the flow opening(s) (21) and one pair to the return opening(s) (22) of the valve assembly (2). 8. Convector according to claim 7, characterized in that for the fluid-conducting connection between the further pairs of collecting channels (3) arranged opposite one another or between the ends of the collecting channels of opposing panels (5, 5a) remote from the valve assembly, pipe and/or T-pieces (8, 10) are provided or connected, preferably in the upper and lower or lateral end region of the collecting channels (3). 9. Convector according to one of claims 1 to 8, characterized in that the heating channels or pipes (2) and the sleeves (4, 4 ^' ), the sleeves (4, 4') and the collecting channels (3), and the collecting channels (3) and the pipe and/or T-pieces (8, 10) or the valve assembly (7) are connected by resistance pressure welding, soldering or fusion welding. 10. Convector according to one of claims 1 to 9, characterized in that the panels (5, 5a) are formed or assembled from individual tubes, preferably flat tubes (2), or that the heating channels (2) in the panels (5, 5a) are formed by longitudinal beading or longitudinal welding of mutually opposite surface areas of hollow panels. 11. Convector according to one of claims 1 to 10, characterized in that the valve assembly (7) is welded between the directly opposite collecting channels (3) of a pair of collecting channels (3) or is connected to the collecting channels (3) on the side of the collecting channels (3) facing away from the heating channels or pipes (2). 12. Convector blank, in particular for producing a convector according to one of claims 1 to 10, characterized in that the convector blank comprises a heating panel (5) divided into heating channels or tubes (2), preferably flat tubes, that each heating channel or each heating tube (2) on each of its two opposite surfaces, in particular in the lateral or upper and lower end regions, are each connected, in particular welded, to two collecting channels (3) via at least two sleeves (4) or one elongated sleeve (4 ¹ ). 13. Convector according to one of claims 1 to 12, characterized in that fluid passage openings are formed in the collecting channels (3) in their wall facing away from the panel for connecting the forward and return flow openings (21, 22) of a valve assembly (7). 14. Convector or convector blank, in particular according to one of claims 1 to 13, which comprises a heating panel (5) or a number of heating panels (5, 5a) arranged in multiple layers, with connections (14, 15) for supply and return pipes provided on site, wherein the heating panel(s) (5, 5a) is (are) divided into preferably horizontally running heating channels and/or comprises (comprise) a number of preferably horizontally running heating pipes, characterized, that each individual heating channel or each individual heating pipe (2) is fluid-conductingly welded on one of its surfaces, in particular in the end region, simultaneously to at least two sleeves (4) or one elongated sleeve (4') and thus simultaneously also the two sleeves (4) or the sleeve (4 ¹ ) to a collecting channel (3), and that in a single-layer convector with horizontally running heating channels or pipes (2), the flow and return openings (21, 22) of a valve assembly (7) have the connections (14, 15) for flow and return pipes provided on site, to one of the two collecting channels (3) or, in the case of vertically running heating channels or pipes (2), a collecting channel (3) is connected to the flow opening (21) and a collecting channel (3) is connected to the return opening (22) of the valve assembly (7), or that in a multi-layer convector with horizontally running heating channels or pipes (2), a flow opening (21) is connected to one collecting channel (3) of a pair of vertically running collecting channels (3) arranged opposite one another on opposite panels (5, 5a) and a return opening (22) of the valve assembly (7) is connected to the other collecting channel (3) or both a flow opening (21), in particular in the upper area of the collecting channel (3), and a return opening (22), in particular in the lower area of the collecting channel (3), is connected to each of the collecting channels (3) of this pair or that in the case of vertically running heating pipes, the flow opening(s) are connected to a pair of horizontally running collecting ducts (3) or to a collecting duct (3) of this pair. (21) and the return opening(s) (22) of the valve assembly (7) is connected to the other pair or a collecting channel (3) of this pair. 15. Convector or convector blank according to claim 14, characterized in that the heating tubes (2), preferably formed by flat tubes, are assembled in panel form or that a number of heating tubes (2) are welded in sequence to a collecting channel via at least two sleeves (4) or one sleeve (4'). 16. Convector or convector blank according to claim 14 or 15, characterized in that in a two-layer convector two heating panels (5), each of which is connected on one surface via sleeves (4, 4') to two collecting channels (3), are arranged opposite one another with their surfaces supporting the collecting channels (3), and that in the case of horizontal heating channels or pipes (2), one pair of the two pairs of opposing collecting channels (3) is connected, preferably welded, to the supply and/or return opening(s) (21, 22) of the valve assembly (7) in a fluid-conducting manner, or in the case of vertically running heating channels or pipes (2), one of the pairs of opposing collecting channels (2) or one collecting channel (3) of this pair is connected to the supply opening (21) and the other pair or one collecting channel (3) of this pair is connected to the return opening (22) of the Valve assembly (7) is connected, preferably welded, and that if necessary the pair of collecting channels (3) arranged in the region of the convector remote from the valve assembly (7) or the ends of the collecting channels (3) remote from the valve assembly are connected in a fluid-conducting manner by means of pipes and/or T-pieces (8, 10), preferably in their upper and lower or lateral regions. 17. Convector or convector blank according to one of claims 14 to 16, characterized in that in the case of a convector with more than two layers, heating panels (5, 5a), of which at least one panel (5) is connected in a fluid-conducting manner, preferably welded, to two collecting channels (3) on only one surface of the heating channels or pipes (2) via sleeves (4, 4'), and of which at least one panel (5a) is connected in a fluid-conducting manner, preferably welded, to collecting channels (3) on both surfaces of the heating channels or pipes (2) via sleeves (4, 4'), are arranged opposite one another and connected to one another, preferably welded, with horizontally running heating channels or pipes (2) each collecting channel (3) of only one pair of collecting channels (3) lying opposite one another being connected to the flow and/or return opening (21, 22) of the valve assembly (7) is connected in a fluid-conducting manner, preferably welded, or in the case of vertically running heating channels or -pipes (2) one of the pairs of opposing collecting channels (2) or a collecting channel (3) of this pair is connected, preferably welded, to the flow opening (21) and the other pair or a collecting channel (3) of this pair is connected to the return opening (22) of the valve assembly (7), and that if necessary the fluid-conducting connection between the further pairs of opposing collecting channels (3) or between the ends of the collecting channels (3) of opposing panels (5, 5a) remote from the valve assembly is made with pipe and/or T-pieces (8, 10), preferably in the upper and lower or lateral area of the collecting channels (3). 18. Convector or convector blank according to one of claims 14 to 17, characterized in that the connection between the heating channels or pipes (2) and the sleeves (4, 4'), between the sleeves (4, 4') and the collecting channels (3), between the collecting channels (3) and the pipe or T-pieces (8, 10) or the valve set (7) is made by resistance pressure welding, soldering or fusion welding. 19. Convector or convector blank according to one of claims 14 to 18, characterized in that separating devices (11), e.g. separating surfaces, are formed or inserted or welded in to set the desired fluid flow direction in the collecting duct(s) (3) and/or heating duct(s) or pipe(s) (2). 20. Convector or convector blank according to one of claims 14 to 19, characterized in that the panels (5, 5a) are formed or assembled from individual tubes, preferably flat tubes (2), or that the heating channels (2) in the panels (5, 5a) are formed by longitudinal beading or longitudinal welding of mutually opposite surface areas of hollow panels. 21. Convector kit for producing multi-layer convectors, comprising a number of single-layer radiator panels with collecting channels (3) connected via sleeves (4, 4") to one and/or two surfaces of the heating channels or pipes (2) facing away from one another and a valve set (7) connectable to the pairs of collecting channels (3) of panels arranged opposite one another, and optionally pipe and/or T-pieces (8, 10) and optionally separating devices (22) inserted or insertable into the heating channels or pipes (2) and/or collecting channels (3).