Pipe bends for exhaust gas routing in heating systems

Abstract

Pipe bend (10) for exhaust gas routing in heating systems, comprising a first pipe bend section (11) arranged concentrically to a first longitudinal axis (13), and a second pipe bend section (12) arranged concentrically to a second longitudinal axis (14), wherein the two longitudinal axes (13, 14) are arranged approximately at right angles to each other, wherein the two pipe bend sections (11, 12) are connected to each other via a bend section (15), wherein at least one condensate drain element (33) is provided in the flow cross-section of the bend section (15), which is provided for directing backflowing condensate from the first pipe bend section (11) to a discharge element preferably arranged in the bend section (15), characterized in that the condensate drain element (33) is in the form of a radially circumferential projection formed on the inner wall of the bend section (15), in particular in the form of a groove (35), or a radially circumferential depression,in particular is formed in the form of a groove, wherein the raised or recessed section does not extend over the entire circumferential wall of the arc section, but at least covers an angle of more than 180°.

Description

[0001] The invention relates to a pipe bend for exhaust gas routing in heating systems according to the preamble of claim 1.

[0002] Such a pipe bend is known from DE 101 59 558 C1. The known pipe bend has an opening in one section of the bend, which is accessible from the outside after removing a closure. This makes it possible, for example, to insert measuring instruments or similar devices into the area of ​​the pipe bend and the pipes connected to the pipe bend for inspection or monitoring of the exhaust pipe. Furthermore, the known pipe bend has a flow guide element that can be inserted into the pipe bend and forms the flow cross-section in the bend's opening. The flow guide element is positioned at the correct angle within the pipe bend by means of a projection on the flow guide element, which is guided in a groove in the pipe bend. The groove also serves to drain any condensate that may accumulate.However, this requires that the condensate also flows into the area of ​​the groove, which is not guaranteed by the disclosed design, so that drainage of at least almost all of the condensate produced is not ensured.

[0003] Another pipe bend is known from DE 299 11 567 U1. The known pipe bend is arranged within the cross-section of an exhaust chimney and serves to guide the exhaust gases from a heating system located outside the exhaust chimney. The exhaust gases from this system are routed to one side of the pipe bend via a connecting pipe. The other side of the pipe bend is extended to the outlet of the exhaust chimney by means of extension pipes, particularly those made of heat-resistant plastic, so that the exhaust gases are guided within the exhaust chimney to the outlet, from where they are released into the environment. Since the pipe bend is often located at a relatively large distance from the outlet of the exhaust chimney, usually on the roof of a residential building, it is necessary to support the pipe bend or the extension pipes, or to relieve them of some of their weight.In the known pipe bend, a lower, flat surface is designed to either rest on a support plate or be connected to a pipe stand. The pipe bend is surrounded by a concrete support structure, such that only a very short section of pipe protrudes from it. This short pipe bend section (perpendicular to the longitudinal axis of the flue) allows the pipe bend to be inserted from above into the relatively small flue. A ceramic ring is bonded to this short pipe bend section using cement, enabling a connection to a flue pipe connected to the heating system. Due to local conditions, this ceramic ring is typically attached to the pipe bend only after it has reached its final position.

[0004] Furthermore, DE 196 21 613 A1 discloses the design of an exhaust gas line on a T-shaped exhaust pipe, which has a condensate drain on a straight section of the pipe. The condensate drain is designed as a separate cover connected to the exhaust pipe. Crucially, the exhaust pipe lacks any means of directing the condensate towards the condensate drain or the cover. Consequently, depending on the installation position of the exhaust pipe, it is not guaranteed that all condensate running down the inner wall of the exhaust pipe due to gravity is actually discharged via the condensate drain. This means that it cannot be reliably ruled out that condensate may accumulate elsewhere, not as intended. In particular, backflow of condensate into the heating system cannot be reliably prevented.The transition area between a vertically arranged pipe bend section and the bend section leading towards the heating system appears to be particularly critical here, since the vertically arranged pipe bend section is usually extended with further, especially straight, exhaust pipes to the end of the chimney, causing all the condensate to run along the bend section, resulting in a large amount of condensate accumulating in the area of ​​the bend section.

[0005] From DE 198 02 614 A1, a branch of an exhaust gas or flue gas duct is known, which has a downwardly sloping bottom that allows condensate to drain away. Furthermore, a drip edge or retaining lip and a lateral bulge are provided at both ends of the branch, each intended to retain condensate and drain it onto or over the sloping bottom.

[0006] In light of the aforementioned prior art, the inventor has set himself the task of further developing a pipe bend for exhaust gas routing in heating systems according to the preamble of claim 1 in such a way as to ensure that at least approximately all the condensate located in the area of ​​the bend section is directed to a point on the pipe bend that is particularly suitable for condensate drainage.

[0007] This problem is solved according to the invention in a pipe bend for exhaust gas routing in heating systems with the features of claim 1 by the fact that the condensate drain element is formed in the form of a radially circumferential projection, in particular in the form of a bead, or a radially circumferential recess, in particular in the form of a groove, formed on the inner wall of the bend section. Within the scope of the invention, a condensate drain element is understood to be an element or means that comes into contact with the condensate flowing along the bend section and diverts its flow path.

[0008] The first design of the condensate drain element in the form of a groove has the particular advantage of allowing the pipe bend to be manufactured easily using a relatively simple tool. According to the invention, the raised section does not extend over the entire circumferential wall of the bottom section. The raised section, according to the invention, encompasses an angle greater than 180°. This depends on the condensate's flow path. The essential point is that the aforementioned raised section is present along the flow path, directing the condensate towards an outlet.

[0009] Alternatively, the condensate drain element can also be designed as a recess on the inner wall of the curved section, particularly in the form of a groove. Such a design has the advantage of particularly low flow resistance for the exhaust gas. Regarding its geometric extent, the same principles apply as those already stated concerning the raised section.

[0010] Advantageous further developments of the pipe bend according to the invention for exhaust gas routing in heating systems are listed in the dependent claims.

[0011] Particularly for individual adaptation to the respective local conditions, especially if a condensate drain nozzle is not possible, it may be provided that the discharge element is designed in the form of a marking arranged on the outside of the bend section, in particular to form a drain hole, wherein the marking is preferably arranged directly next to the condensate discharge element on the side facing the first pipe bend section.

[0012] The condensate drain element is particularly easy to manufacture if it has two sections arranged at an angle to each other, each preferably with a straight shape.

[0013] A particularly preferred embodiment of the invention comprises support means for transferring a weight force to a support device, preferably fixed in a flue gas chimney. This enables the transfer of the weight force of at least the pipe bend, or in practice together with the weight force of the pipe sections arranged above the pipe bend in the flue gas chimney, to a support device.

[0014] In a particularly preferred design of the support elements at the condensate drain, the support elements are configured as a radially circumferential flange located below the level of the second pipe bend section. This radially circumferential flange provides a relatively large support surface, which is thus advantageously subjected to relatively low mechanical stress when weight is applied. Furthermore, the flange's position below the level of the second pipe bend section ensures that a pipe connected to the second pipe bend section and coupled to the heating system can be positioned above a support structure, typically designed as a support plate, and therefore does not interfere with the support plate.

[0015] Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing.

[0016] This shows in: Fig. 1 a perspective view of an exhaust pipe routing equipped with a pipe bend according to the invention, Fig. 2 the order according to Fig. 1 in a partially cut-out side view, Fig. 3 a detail of the Fig. 2 in enlarged longitudinal section view, Fig. 4 and Fig. 4a Pipe bend according to the invention in longitudinal section and Fig. 5 a front view of the pipe bend according to Fig. 4.

[0017] Identical components or components with the same function are provided with the same reference numbers in the figures.

[0018] In the Fig. Figure 1 shows an arrangement 100, which is part of an exhaust gas piping system, arranged in particular within a shaft guide made of stainless steel. Here, the arrangement 100 serves to connect an exhaust gas outlet of a heating system (not shown) to an outlet area through which the exhaust gases of the heating system are at least indirectly released into the environment.

[0019] Order 100 includes one in the Fig. 1 recognizable, inventive pipe bend 10, which has two pipe bend sections 11, 12, which, as can be seen in particular from the Fig. As can be seen in Figure 2, the pipe bend 10 has longitudinal axes 13 and 14, which are arranged approximately at right angles to each other, in particular inclined at an angle α of 87°. This creates a gradient towards the exhaust outlet of the heating system. The pipe bend 10 is made of plastic, in particular polypropylene (PP), and is formed in one piece. The pipe bend 10 is connected at the second pipe bend section 12 to a straight exhaust pipe 1, which is connected, optionally via additional pipe extensions not shown in the figures, to the aforementioned exhaust outlet of the heating system. The first pipe bend section 11 can be extended by means of further extension pipes, not shown in the figures, which are located within the exhaust shaft, such that the exhaust gas is discharged via the further pipe extensions into the area of ​​the outlet of the chimney system.

[0020] As particularly evident from the Fig. As can be seen in Figure 2, on the side facing away from the first pipe bend section 11 in the area of ​​a bend section 15, which connects the two pipe bend sections 11, 12, a condensate drain nozzle 17 is arranged, which is cylindrical and whose longitudinal axis is aligned with the first longitudinal axis 13.

[0021] It may also be provided that instead of the condensate drain nozzle 17, the following is used: Fig. 4a a bore marking 16 is formed on the outer wall of the arc section 15, which enables (subsequent) drilling through the arc section 15 to form a condensate drain.

[0022] The condensate drain nozzle 17 is equipped with a [unclear] in the Fig. 1 recognizable extension piece, in particular in the form of a siphon, connectable, in particular by screwing it to the condensate drain nozzle 17.

[0023] The arc section 15 has a continuous curvature profile, preferably with a constant radius of curvature r.

[0024] The two pipe bend sections 11 and 12, for example, have a nominal diameter of 80 mm. The first pipe bend section 11 has a pipe socket connection on its end face facing away from the condensate drain nozzle 17, so that the extension pipes mentioned above can be connected to the first pipe bend section 11 by pushing them on and locking them into place. In contrast, the second pipe bend section 12, which has a much smaller axial extent than the first pipe bend section 11, for example, a total axial extent of approximately 20 mm, has an external thread 18 on its outer circumference onto which an internal thread 2 of the exhaust pipe 1 can be screwed. The internal thread 2 of the exhaust pipe 1 and the external thread 18 of the second pipe bend section 12 thus form a positive-locking connection in the form of a threaded connection. On the side facing away from the bend section 15, the second pipe bend section 12 has, as can be seen in particular from the Fig. As can be seen in Figure 3, a radially circumferential annular groove 19 is provided, in which a sealing ring 20 is arranged, forming a sealing device. The sealing ring 20, in the form of an O-ring, seals the second pipe bend section 12 towards the exhaust pipe 1, so that no exhaust gas can escape from the connection area between the pipe bend 10 and the exhaust pipe 1.

[0025] In the area of ​​the bend section 15, on the side facing the second pipe bend section 12, just above the external thread 18, there is a suspension device in the form of a suspension eyelet 22.

[0026] The condensate drain fitting 17 has a radially circumferential flange 25 on its outer side, which is connected to the outer wall of the condensate drain fitting 17 by means of several reinforcing ribs 26 arranged at equal angular intervals to one another, in the exemplary embodiment by means of four. The underside 27 of the flange 25 serves as a support for the pipe bend 10 on the upper side of a Fig. 2. The support device 30, merely indicated, e.g., in the form of a support plate or similar, has a corresponding recess or opening in the area of ​​the condensate drain nozzle 17, such that the flange 25 of the condensate drain nozzle 17 rests on the support device 30. It is also essential that the arrangement of the underside 27 of the flange 25 is such that the underside 27, as shown by the Fig. 2 is recognizable as being located at a level below the external thread 18 of the second pipe bend section 12. This ensures that, in particular, the exhaust pipe 1 is still located above the support device 30 and can therefore be connected to the pipe bend 10 without risk of collision.

[0027] Spaced apart from the flange 25, the condensate drain nozzle 17 has a radially circumferential groove 31 on its outer side, on the side opposite the first pipe bend section 11 and below the support device 30. This groove 31 forms part of a locking device. The groove 31 interacts with an element of the locking device (not shown in the figures), for example, in the form of a wire spring clip or similar, such that the pipe bend 10 is axially secured in the support device 30 when connected to it.

[0028] On the side of the flange 25 opposite the first pipe bend section 11, the condensate drain fitting 17 has an external thread 32, which serves to attach the aforementioned siphon. The condensate drain fitting 17 has a significantly smaller diameter than the two pipe bend sections 11 and 12, for example, a diameter of 24 mm. The condensate drain fitting 17 serves to discharge condensate that forms on the inner wall of the pipes in the area above the first pipe bend section 11 and runs down towards the pipe bend 10 due to gravity. In order to enable controlled discharge or guidance of the condensate in the area of ​​the pipe bend 10 towards the condensate drain fitting 17, a channel is provided on the inner wall of the bend section 15, as can be seen in particular from the Fig. 4, Fig. 4a and Fig.As can be seen in Figure 5, a condensate drain element 33 is arranged in the form of a groove 35. Alternatively, a groove-shaped design of the condensate drain element 33 is also conceivable (not shown). The groove 35 preferably extends over the entire inner circumference of the arc section 15 and has two sections 36, 37 arranged at an angle α of more than 180° to each other. The sections 36, 37, each of which are straight, form a barrier for flowing condensate over the inner circumference of the arc section 15, along which the condensate is guided to the condensate drain nozzle 17 or to the bore marking 16, in order to be discharged from the arc section 15. For this purpose, the condensate drain nozzle 17 or the bore marking 16 in the area of ​​section 37 are arranged such that the condensate from section 37 enters the condensate drain nozzle 17 or is discharged via the bore marking 16 (if a hole is formed).Preferably, section 37 is aligned with the condensate drain nozzle 17. When using the bore marking 16, it is preferably arranged directly next to section 37 on the side facing the first pipe bend section 11. Condensate coming from the first pipe bend section 11 thus enters the area of ​​both sections 36 and 37 and is guided along the groove 35 to the condensate drain nozzle 17. The groove 35 has, for example, a width of 2 mm and extends from the inner wall of the bend section 15 to a height of approximately 2.5 mm.

[0029] The pipe bend 10 described so far can be modified or adapted in a variety of ways without deviating from the inventive concept. Reference symbol list 1 exhaust pipe 2 internal threads 10 pipe bends 11 Pipe bend section 12 Pipe bend section 13 Longitudinal axis 14 Longitudinal axis 15 arc section 16 Hole marking 17 Condensate drain nozzles 18 external threads 19 Ring groove 20 sealing rings 22 Suspension eyelet 25 flange 26 Reinforcing rib 27 Underside 30 Support device 31 Nut 32 external threads 33 Condensate drain element 35 groove Section 36 Section 37 100 arrangement α, β angles

Claims

[1] Pipe bend (10) for exhaust gas routing in heating systems, comprising a first pipe bend section (11) arranged concentrically to a first longitudinal axis (13), and a second pipe bend section (12) arranged concentrically to a second longitudinal axis (14), wherein the two longitudinal axes (13, 14) are arranged approximately at right angles to each other, wherein the two pipe bend sections (11, 12) are connected to each other via a bend section (15), wherein at least one condensate drain element (33) is provided in the flow cross-section of the bend section (15), which is provided to direct backflowing condensate from the first pipe bend section (11) to a discharge element preferably arranged in the bend section (15), characterized by, that the condensate drain element (33) is formed in the form of a radially circumferential projection on the inner wall of the arc section (15), in particular in the form of a groove (35), or a radially circumferential depression, in particular in the form of a groove, wherein the projection or depression does not extend over the entire circumferential wall of the arc section, but at least covers an angle of more than 180°. [2] Pipe bend according to claim 1, characterized by , that the discharge element is designed in the form of a condensate drain nozzle (17), wherein the condensate drain nozzle (17) is preferably aligned with the longitudinal axis (13) of the first pipe bend section (11). [3] Pipe bend according to claim 1 or 2, characterized by, that the discharge element is designed in the form of a marking (16) arranged on the outside of the arc section (15), in particular to form a drain hole, wherein the marking (16) is preferably arranged directly next to the condensate discharge element (33) on the side facing the first pipe arc section (11). [4] Pipe bend according to claim 2 or 3, characterized by , that the condensate drain element (33) has two sections (36, 37) arranged at an angle (β) to each other, each preferably having a straight shape. [5] Pipe bend according to any one of claims 1 to 4, characterized by, that the second pipe bend section (12), which serves for connection to a heating system, has a shorter length than the first pipe bend section (11), and that the second pipe bend section (12) has a positive locking connection, preferably in the form of a threaded connection (18), for connection to an exhaust pipe (1) of the heating system and additionally a sealing device for arranging a sealing element, preferably in the form of an O-ring (20), wherein the sealing device seals the second pipe bend section (12) to the exhaust pipe (1) in a gas-tight manner. [6] Pipe bend according to any one of claims 1 to 5, characterized by , that the arc section (15) is continuously curved, preferably with a constant radius of curvature (r). [7] Pipe bend according to any one of claims 1 to 6, characterized by, the arc section (15) has support means for transferring a weight force to a support device (30) preferably arranged in a fixed position in an exhaust chimney, and that the support means are formed on the side of the arc section (15) facing away from the first pipe arc section (11). [8] Pipe bend according to any one of claims 1 to 7, characterized by , that the second pipe bend section (12) is arranged at an angle (α) of less than 90°, in particular 87°, to the first pipe bend section (11).

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