DE202008011266U1 - heater - Google Patents

Abstract

Heater, in particular Brennwertheizgerät, comprising a gas or oil burner in a cylindrical combustion chamber (1), which is bounded radially by a helically coiled heat exchanger, at least one gap (3) for the passage of hot gases through the heat exchanger, a front cover member for receiving the Burner, a rear cover element as a closure for the combustion chamber (1), supply and return connection pieces and radially outside the heat exchanger with an exhaust gas collecting space (4) under a surrounding jacket with a connecting piece for an exhaust pipe, characterized in that the profile of the helically coiled heat exchanger consisting of at least two circular rings (2), which are each formed of the same, welded together half-shells, that between two circular rings (2) a gap (3) is provided for the passage of hot gases, and that the hydraulic connection of adjacent circular rings (2 ) above openings (5) is provided in the half shells, which are arranged at an angle of 45 ° to the parting plane of a circular ring (2).

Description

The Innovation relates to a heater, in particular a condensing boiler, according to the preamble of the protection claim 1.

generic Heaters are equipped with a gas or oil burner fired and have a cylindrical combustion chamber, which radial from a helically coiled heat exchanger is limited. At least one gap between the coiled tubing for the passage of the hot gases represents the actual heat exchanger surface Further common are a front cover element for Recording of the burner, a rear cover element as a closure for the combustion chamber, supply and return connection pieces as well an exhaust gas collecting space, which is radially outside of the heat exchanger arranged under a surrounding jacket and with a connecting piece is provided for an exhaust pipe. With regard to the heating water side Flow guide is a forced flow through heat exchanger. A circulation pump ensures a given Water volume flow through the mostly relatively narrow water channels. In this way, despite low water content quite high, hot gas side registered heat flow densities feasible.

From the DE 20 2005 011 633 U1 a heater with two helically coiled heat exchangers is known, which are screwed into one another and parallel to each other by a heating medium can be flowed through. The juxtaposed coil ends are connected to each other and have a common connection piece. The supply and return connections are located on opposite ends of the heat exchanger.

The DE 10 2004 023 711 B3 also shows a heater with a helically coiled heat exchanger and at least two hydraulically interconnected coil areas. These are formed differently in diameter and can be arranged helically rotated into each other. The exhaust gas thus flows first through the gaps of the inner coil and then over a gap further through the gaps in the outer coil. Because a one-piece tube, in particular square tube, is also used in this embodiment, it is hardly possible in terms of production technology to influence the gap geometry.

Furthermore, from the DE 10 2006 029 854 A1 a heat exchanger with annular flow channels known. Here several identical annular segments are combined vertically and parallel to each other to form a heat exchanger. Between the segments there is a gap for the passage of the hot gases from the combustion chamber arranged in the center to the outside. The heat-transferring surfaces define this gap on both sides and the heating medium flows inside the segments. Even if there is a forced-flow heat exchanger with an alternately top and bottom provided overflow from segment to segment, there may be problems because a complete venting from the upper regions of the individual segments is not possible.

Of the Innovation is the object of the heat exchanger a heater, in particular a condensing boiler, especially with regard to compact dimensions and to optimize good heat transfer properties.

Innovation is this is achieved with the features of the protection claim 1. Advantageous developments are to be taken from the subclaims.

The from a cylindrical combustion chamber and a radially limiting this helical coiled heat exchanger existing Heater is characterized in that the profile of the helical coiled heat exchanger of at least two circular rings exists, which in each case from the same, welded together Half shells are formed. Between two circular rings is one Gap provided for the passage of hot gases. The hydraulic connection of adjacent circular rings via openings in the half-shells, which at an angle of 45 ° to the dividing plane a circular ring are arranged.

An opening in the half shell for the hydraulic connection of adjacent Circular rings is in the range of a directed to the outside Expansion of a half-shell arranged. Here is the plane of the opening at an angle of 45 ° to the dividing plane of a circular ring and aligned with the center of the half-shell.

In each case an opening in the half-shell for the hydraulic connection of adjacent circular rings, a return of the outer side of a half-shell is arranged. Thus, a widening of a half shell of a first circular ring directed towards the outside engages in the recess of the outside of a half shell of a second circular ring. As a result, associated openings in the two circular rings abut each other and can be tightly connected. This results in a close toothing of the circular rings, even to form narrow gaps for the passage of Heizgasdurchtritt. Preferably, the outer sides of two adjacent circular rings in the region of the associated openings are welded together. In the production of a new According to the heat exchanger according to the invention, two half-shells with the outsides forming a gap are first placed against each other and welded. The opening area is also connected. In the subsequent step, a further half-shell is placed and the peripheral seam welded at the separation point between two half-shells forming a water ring.

The Geometry of the gap for the passage of hot gases between the profile of the heat exchanger and / or the Gap-limiting, heat-transferring surfaces is by the forming process in the production of the half-shells influenced. For example, embossing and / or Surface structures, in particular for turbulence generation, be introduced.

Farther may be neighbors, facing each other Gap delimiting surfaces with protrusions be provided. These define the gap width and support on each other and / or on the opposite surface from. Two adjacent, opposing, the gap Limiting surfaces are solid by spot welding connected with each other. Therefore, the free gap cross-section remains predominant guaranteed and only in the field of welding as well as the openings is punctually a touch or gap narrowing before.

With The design according to the innovation results in a heat exchanger for a heater with the best suitability for Condensing operation, very compact dimensions and good heat transfer properties. All half shells are the same and thus cost-effective produced. The heat exchanger becomes spiral flows through and the profile structure with sheet metal half shells In addition to the simple production also offers the advantage of different Lengths for different combustion and heat exchanger capacities variable cover. Nevertheless, all then remain arranged on the front side Attachments and the connection between cover elements and water same profile leading body. Only the surrounding Coat varies. Because of the low exhaust gas temperatures this can even made of plastic.

The Drawing illustrates exemplary embodiments of the innovation. It shows a heat exchanger of a heater:

1 with two circular rings in a perspective view,

2 : a circular ring in a perspective view and

3 : with two circular rings in the top view of the connection area.

A cylindrical combustion chamber 1 is radially from a helically coiled heat exchanger consisting of at least two circular rings 2 , limited. This has several columns 3 for the passage of hot gases, which is an exhaust gas collection chamber 4 located radially outside the heat exchanger. Two adjacent circular rings each 2 limit a gap 3 ,

The circular rings 2 each consist of the same, welded together half-shells and the hydraulic connection of adjacent circular rings 2 is over openings 5 provided in the half-shells. These openings 5 in the half shell are in the range of an expansion directed to the outside 6 arranged a half-shell, wherein the plane of the opening at an angle of 45 ° to the parting plane of a circular ring and is aligned with the center of the half-shell. Before every opening 5 there is a return 7 the outside of a half shell. The expansion 6 a first circular ring 2 thus accesses the return 7 a second circular ring 2 one, so that associated openings 5 abut each other and are welded together.

On the the gap 3 delimiting surfaces of the circular rings 2 are projections 8th attached, which define the gap width and are supported on each other. Two associated, opposing projections 8th are connected by spot welding.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 202005011633 U1 [0003]
• DE 102004023711 B3 [0004]
• DE 102006029854 A1 [0005]

Claims (8)

Heater, in particular condensing boiler, comprising a gas or oil burner in a cylindrical combustion chamber ( 1 ), which is bounded radially by a helically coiled heat exchanger, at least one gap ( 3 ) for the passage of hot gases through the heat exchanger, a front cover member for receiving the burner, a rear cover element as a closure for the combustion chamber ( 1 ), Supply and return connecting pieces as well as radially outside the heat exchanger with an exhaust gas collecting space ( 4 ) under a surrounding jacket with a connecting piece for an exhaust pipe, characterized in that the profile of the helically coiled heat exchanger of at least two circular rings ( 2 ), which are each formed of the same, half-shells welded together, that between two circular rings ( 2 ) A gap ( 3 ) is provided for the passage of hot gases, and that the hydraulic connection of adjacent circular rings ( 2 ) via openings ( 5 ) is provided in the half-shells, which at an angle of 45 ° to the parting plane of a circular ring ( 2 ) are arranged. Heater according to claim 1, characterized in that an opening ( 5 ) in the half shell for the hydraulic connection of adjacent circular rings ( 2 ) in the region of an expansion directed towards the outside ( 6 ) is arranged a half-shell, wherein the plane of the opening ( 5 ) at an angle of 45 ° to the parting plane of a circular ring ( 2 ) and is aligned with the center of the half-shell. Heater according to claim 1 or 2, characterized in that in front of an opening ( 5 ) in the half shell for the hydraulic connection of adjacent circular rings ( 2 ) a return ( 7 ) is arranged outside of a half-shell. Heater according to one of claims 1 to 3, characterized in that an outwardly directed widening ( 6 ) a half-shell of a first circular ring ( 2 ) in the return ( 7 ) the outside of a half-shell of a second circular ring ( 2 ) so that associated openings ( 5 ) in the two circular rings ( 2 ) abut each other and are tightly connected. Heater according to one of claims 1 to 4, characterized in that the outer sides of two adjacent circular rings ( 2 ) in the region of the associated openings ( 5 ) abut each other and are welded together. Heater according to one of claims 1 to 5, characterized in that the geometry of the gap ( 3 ) for the passage of hot gases between the profile of the heat exchanger and / or the gap ( 3 ) limiting, heat-transferring surfaces by the forming process in the production of the half-shells can be influenced. Heater according to one of claims 1 to 6, characterized in that adjacent, opposing, the gap ( 3 ) delimiting surfaces with protrusions ( 8th ), which define the gap width and are supported on each other and / or on the opposite surface. Heater according to one of claims 1 to 7, characterized in that two adjacent, opposing, the gap ( 3 ) limiting surfaces are connected by spot welding, the free gap cross-section is mostly guaranteed and only a point contact.