NL1015628C2 - Flue pipe fitted into brick chimney stack, is assembled from several sections which have sealed junctions, gripped by toothed rings - Google Patents

Abstract

The burner (4), e.g. a gas or oil-fired heating boiler, is linked to the vertical flue by an angled exhaust pipe (15). The flue consists of similar sections (12, 13, 14), supported by horizontal pipe clamps (6). The male lower ends of the sections seal inside the female upper ends of the next section. The sections are gripped inside the female ends by toothed rings and rubber or plastic sealing rings. The toothed ring can flex to allow for expansion movement.

Description

Flue gas discharge channel provided with coupling means for coupling a male end of a first pipe part and a female end of a second pipe part.

The present invention relates to a flue gas discharge channel, comprising a first pipe part with a male end and a second pipe part with a female end, the mounted end of the male end being inserted into the female end, the first or second pipe part carrying coupling means which being mounted in mounted condition with respect to said first and second pipe part, respectively, and engaging the wall of the second and first pipe part, and wherein the first and / or second pipe part is made of plastic.

Such flue gas discharge channels are known. The pipe parts forming the channel are generally mutually connected by inserting a male end of another pipe part into a female end of one pipe part. It is known here to provide one of the ends to be joined, generally the female end, with a flexible sealing ring, often with a rubber or rubber-like plastic. Such a sealing ring is generally fixed in position when mounted at the female end by insertion into a circumferential slot formed in the interior of the female end. In the assembled state the flexible ring will engage under some pressure on the wall, in particular the outer wall, of the other pipe part, in particular the outer wall of the male end. Such a flexible ring has in particular the task of providing a gas-tight seal. However, such a flexible ring allows, often even consciously, the mutual movement of the pipe parts in axial direction, albeit that the axial effect of this clamping action mutual movement is more or less impeded. In practice, the pipe parts move mutually relative to each other with flue gas discharge channels as a result of expansion during heating of the flue gas discharge channel and shrinkage when the flue gas discharge channel is cooled. In the case of metal flue gas discharge channels, usually constructed from aluminum pipe parts, this expansion and shrinking is generally not a major problem since the expansion coefficient of such metals is relatively low. In particular with plastic pipe parts, this expansion and shrinkage leads to problems, since the so-called expansion coefficient of the plastics used is relatively large. Expansion or extension values of 7 mm per meter of pipe length are more the rule than the exception for plastic pipe sections. With a total length of the flue gas discharge channel of, for example, 5 m, this means an extension of the flue gas discharge channel of 3.5 cm and even a total extension of 7 cm with a total length of the flue gas discharge channel of 10 m. When such a flue gas discharge channel then shrinks again in length, for example because the combustion installation to which the flue gas discharge channel is connected is switched off, the connections between the female and male ends can become detached from one another, the so-called run-out.

The present invention has for its object to provide a flue gas discharge channel of the type mentioned at the beginning, in which in particular the so-called run-out is prevented, preferably even completely prevented.

This object is achieved according to the invention with a flue gas discharge channel comprising a first pipe part with a male end and a second pipe part with a female end, wherein in the mounted state the male end is inserted into the female end, the first or second pipe part carrying coupling means which in fixed condition are fixed with respect to said first and second pipe part, respectively, and engage on the wall of the second and first pipe part, and wherein the first and / or second pipe part is made of plastic, wherein the coupling means are distributed over the circumference of the flue gas discharge channel teeth provided that engage in the mounted state in the wall of said second and first pipe part, respectively.

By providing the coupling means with teeth which not only engage on the wall of the second and first pipe part, but also engage there, an anchoring is effected which counteracts the disassembly of the male and female end and preferably completely prevents or at least prevents dismantling forces smaller than the internal material stresses that would arise if the ends of the pipe part in question were held in a fixed position in the event of shrinkage (which would hinder shortening of the pipe part due to shrinkage). The teeth can, for example, engage with the wall by penetrating into the wall of the second and first pipe part as a result of a sharp point. However, it is also conceivable that the teeth engage, or at least engage behind, a cam provided on the second and first pipe section, or engage a recess formed in the wall of the second and first pipe section, and thus anchoring the male end versus female end operations.

With a view to simple mounting of the teeth on the first and second pipe part, according to the invention, it is preferred if the teeth are provided on a ring or sleeve carried by the first and second pipe part, respectively. This ring or sleeve may or may not be interrupted in the circumferential direction. A ring or sleeve interrupted in circumferential direction has the advantage that it can be reduced in circumference for the purpose of mounting in or on the first or second pipe part, or optionally enlarged in circumference.

In order, on the one hand, to facilitate inserting a male end into a female end, or at least to hinder it as little as possible, and, on the other hand, to prevent the dismantling of a male and female end put together, it is preferable according to the invention for the engagement edges of the teeth 15 point obliquely with respect to the insertion direction towards the central axis of the flue gas discharge channel.

In order to obtain a reliable coupling opposing the male and female end, it is preferred according to the invention if the teeth are made of steel or a steel alloy such as spring steel.

Such teeth are relatively hard and wear-resistant. Teeth of spring steel also offer the advantage that, with an orientation according to claim 3, they can bend slightly away against a spring force when the male end is inserted into the female end. As a result of the resilience, it is then still ensured that the coupling results in a disassembly-preventing, at least counteracting, anchoring.

In order for the teeth to be able to penetrate relatively easily and reliably into the wall of the second and first pipe part, according to the invention, it is preferable if the wall of that second or first pipe part with which the teeth engage is made of plastic. Relatively sharp objects such as the teeth 30 can relatively easily penetrate both harder and softer plastics

In order to leave the internal passage diameter of the flue gas discharge channel undisturbed, or at least to affect it as little as possible, it is preferred according to the invention if the teeth are fixed in the interior of the female end.

According to the invention, the teeth can advantageously be provided on the inside of a ring or sleeve which is interrupted or not interrupted in the circumferential direction and which is anchored in an inner peripheral slot in the female end.

In order to be able to break the anchoring of the male end to the female end for the purpose of, for example, work on the flue gas discharge duct, it is advantageous according to the invention if the coupling means further comprise: - external screw thread at the end of the female part; and - an internal threaded member provided with the external thread matching the external thread.

Such a construction offers the possibility of reducing the anchoring force and thus allowing the disassembly of the male and female part.

According to an advantageous embodiment, the teeth are herein supported on a ring enclosed between the nut member and the head end of the female end. When the nut member is then loosened, the ring with teeth will probably still be anchored on the outer wall of the male end, but will no longer be fixed at the female end and thus allow the male and female ends to be pulled apart. In such an embodiment with external thread provided on the female part and a nut member provided with mating thread, it may be in addition or additionally advantageous if the end of the female end is provided with longitudinal slots and internally carries the teeth and if the nut member has an internal tapered or otherwise tapered part and / or the female part is provided with an external tapered or otherwise tapered part, such that when the nut member is tightened the tiltings of the female end lying between the longitudinal slots are pressed inwards.

In order to be able to mount the coupling means relatively easily, for example also on already installed and in use flue gas discharge ducts, it is preferred according to the invention if the external screw thread is provided on an attachment mounted at the female end, which is preferably divided in the longitudinal direction or at least has a cut. Such an attachment can then, for example by being bent apart, be placed around the female end and then be held together by the nut member. It is also conceivable that such an attachment is slid directly onto the female end, wherein the female end is, as it were, inserted into the attachment as a male part.

The present invention will be explained in more detail below with reference to the drawing. The drawing schematically shows some examples of embodiments of the invention. It shows:

FIG. 1 is a schematic longitudinal sectional view of a flue gas discharge duct according to the invention and mounted in a chimney shaft of a building; FIG. 2 in the form of the detail I from FIG. 1 shows in longitudinal section a coupling of a male and a female end according to a first embodiment of the invention;

FIG. 3 in the form of the detail I from FIG. 1 shows in longitudinal section a coupling of a male and a female end according to a second embodiment of the invention;

FIG. 4 in the form of the detail I from FIG. 1 shows in longitudinal section a coupling of a male and a female end according to a third embodiment of the invention;

FIG. Fig. 5 shows, in the form of detail I of Fig. 1, a longitudinal sectional coupling of a male and a female end according to a fourth embodiment of the invention;

FIG. 6 as a variant of the detail I from FIG. 1 a fifth embodiment of a coupled female and male end of a flue gas discharge duct according to the invention; FIG. 7 in the form of the detail I from FIG. 1 shows in longitudinal section a coupling of a male and a female end according to a sixth embodiment of the invention;

FIG. 8 in top view (Fig. 8a) and longitudinal section (Fig. 8b) according to VIII-VIII (Fig. 8a) an embodiment of a ring with teeth as applicable to the embodiment according to Figs. 4, FIG. 6 and FIG. 7;

FIG. 9 in top view (Fig. 9a) and longitudinal section (Fig. 9b) according to IX-IX (Fig. 9a) an embodiment of a ring with teeth as applicable to the embodiment according to Figs. 4, FIG. 6 and FIG. 7; 1 01 5628 6

FIG. 10 shows in top view (Fig. 10a) and longitudinal section (Fig. 10b) according to VIII-VIII (Fig. 10a) an embodiment of a sleeve with teeth as applicable in the embodiment according to Figs. 5;

FIG. 1 is a longitudinal sectional view of a chimney shaft 1 in a building 5, which extends from ground level 2, for example, up to or possibly through the roof 3. The chimney shaft 1 can be bricked. In present-day incineration plants 4 for heating and / or tap water, which are generally of the HR type or optionally VR type, a flue gas discharge duct 10 is generally laid by such a conventional chimney shaft 1. This flue gas discharge duct 10 is necessary in order to protect the conventional chimney shaft from moisture that is abundantly present in the form of condensation in the flue gases originating from HR-type or VR-type incineration plants. Such a flue gas discharge duct is generally composed of a number of pipe parts 11, 12, 13, 14 and 15, of which, as in FIG. 1, the pipe part 15 provides the connection to the combustion installation 4 and the pipe part 11 protrudes through the roof 3 and optionally carries a discharge cap 16. With such flue gas discharge channels, the pipe parts are often each provided with a male end and a female end and connection is established by inserting a male end in each case into a female end. But it is also very conceivable that relatively longer pipe parts are used with identically shaped ends that are mutually coupled via shorter pipe parts, also called sleeves. Such sleeves are usually laid around the longer pipe sections, but may possibly also lie inside them. Within the scope of the present invention, a sleeve is also to be understood as a pipe part.

With particularly longer flue gas discharge channels, the problem occurs that when the combustion installation 4 is switched on, the flue gas discharge channel and thus the component pipe parts 11-15 expand under the influence of the heat and the channel as such becomes longer. This lengthening is not so much the problem, since this extension mainly leads to the pipe part 11 protruding from the roof 3 coming to protrude further from the roof. The problem usually arises when the combustion installation 4 switches off for a sufficiently long period of time to allow the flue gas discharge duct and thus the component pipe parts 11-15 to cool. During cooling, the pipe parts will shrink again. This shrinking can lead to a loosening of the connections between the pipe parts when the pipe parts are impeded in their movement, for example by so-called spacers 16 which keep the flue gas discharge duct 10 in the chimney shaft 1 positioned at a distance from the inner wall thereof. Instead of keeping a distance, it is also conceivable that the flue gas discharge channel 10 can be mounted, as it were, directly against the inner wall of the chimney shaft 1 by means of, for example, U-shaped brackets with which the flue gas discharge channel. Such mounting accessories (such as the aforementioned spacers or brackets) also impede the freedom of movement of the pipe parts. The result may then be that a male end of one pipe part extends out of the female end of the other pipe part, which will be obvious.

undesirable since the flue gas discharge channel will then not be a closed channel, but a leaky channel. In practice, this problem arises in particular with pipe parts which are manufactured from a material with a relatively large expansion coefficient, such as in particular plastic pipe parts. With plastic pipe sections, expansion of 7 mm per meter of pipe length is in practice no exception.

The present invention provides coupling means which counteract the so-called run-out, preferably prevent or at least to a large extent prevent it. In the FIG. 2-10 different embodiments of such coupling means are shown. FIG. 2-7 each show a variant of the detail I from FIG. 1, 20 while in Figs. 8-10 three different embodiments of a toothed ring and sleeve are shown in more detail.

FIG. 2 shows a substantially conventional coupling of a male end 21 of a pipe part into a female end 20 of another pipe part, which deviates from the conventional couplings only in the sense that a so-called toothed ring 24 is added.

The female pipe part 20 is provided with a receiving groove 22 in which, as is known from the prior art, there is a sealing ring 23 of a rubber or plastic rubber. This sealing ring 23 provides a seal to prevent leakage of gases or liquids. According to the invention, a so-called toothed ring 24 is also incorporated in the receiving groove 22 for the sealing ring 23. This toothed ring 24 extends in a flat diametrical plane and can for instance have the shape as shown in Fig. 8a or 9a, showing toothed edge 84 with edges 85 and a toothed ring 94 with teeth 95, respectively. As will become clear later and in FIG. 8b and 9b are indicated by means of cross-sectional views. 1015628 8 the toothed rings, such as toothed ring 24, do not necessarily have to run in a flat, diametrical plane. The toothed ring 24 is provided with teeth 25 which, as just indicated, in diametrical planar versions of the teeth 85 and 95, respectively, of FIG. 8a and 9a respectively. The teeth 25 engage in the outer wall of the male end 21 and thus anchor themselves in that outer wall. In this way the so-called outflow of the male end 21 from the female end 20 is prevented.

FIG. 3 shows a variant of the embodiment according to FIG. 2. In FIG. 3 for corresponding parts, the reference numbers from FIG. 2 increased by ten. The embodiment according to FIG. 3 differs from that according to FIG. 2 in the sense that the toothed ring 34 with teeth 35 is currently not accommodated in the receiving groove 32 for the sealing ring 33, but in a separately formed receiving groove 36. The advantage of this embodiment is thus a more robust fixation of the toothed ring in the female part 30. is achieved.

FIG. 4 shows a variant of the embodiment according to FIG. 3. For corresponding parts, the reference numbers from Figs. 3 increased by ten. The embodiment according to FIG. 4 differs from that according to FIG.

3 in the sense that the toothed ring 44 with teeth 45 no longer run in a flat diametrical plane, but run in a tapered circumferential plane, as is the case with the ones shown in FIGS. 8 and 9, tooth rings 84 and 94 respectively with teeth 85 and 95. The tooth ring 44 with teeth 45 may, for example, be identical to the tooth ring 84 with teeth 85 of FIG. 8 or the tooth ring 94 with teeth 95 from FIG. 9. As with reference to Figs. 8 and 9, the effective sides of the teeth 85 and 95 and therefore also those of the teeth 45 are oriented obliquely in the insertion direction S (Fig. 4) towards the central axis 5. This facilitates, on the one hand, inserting the male part 41 in the plugging direction S into the female part 40 and, on the other hand, this orientation makes it more difficult to pull the male part 41 from the female part 40 in the opposite direction to the stabbing direction S. The teeth 45, 45 and 95 are as it were, working as a kind of barbs. In the embodiment according to FIG. 4, as well as those according to FIG. 8 and 9 and Figs. 5-7 and 10, it is particularly advantageous if the toothed ring or, optionally, the The tooth sleeve with teeth to be discussed is made of spring steel. Thus, when the male part is inserted into the female part in the plugging direction S, the teeth can bend slightly away against a spring force. This bending away is particularly facilitated and the final locking is particularly improved when the male part 41 has an outer diameter that fits into the inner diameter of the female part 40 with some play, for example 1 mm to 2 mm. In order to obtain a leak-tight seal, it is then important to further adjust the sealing ring 43 to bridge this play.

The embodiment according to FIG. 5 differs from the embodiment according to FIG. 4 essentially because instead of a so-called toothed ring use is made of a so-called toothed sleeve. With regard to corresponding parts, FIG. 5 the 10 reference numbers of FIG. 4 raised with ten used. For anchoring the toothed sleeve 54, it is provided on its upper side with a peripheral edge 57 which is received in the peripheral slot 56 in the female part 50. The toothed sleeve 54 with teeth 55 and peripheral edge 57 is shown in greater detail in FIG. 10a and 10b. It will be clear, however, that instead of the, as it were, triangular teeth 55, many differently shaped teeth can be used, such as, for example, the teeth 85 of FIG. 8.

FIG. 6 shows as a still further variant of FIG. 5 shows the embodiment of the invention, which in turn is directly a variant of the embodiment according to FIG. 2, since the standard pipe parts in this embodiment do not themselves have to be adapted. 20 just like this with the embodiment according to FIG. 2 is the case. With respect to FIG. 2, the reference numbers for corresponding parts have been increased by forty. The toothed ring 64, which is of the type shown in FIG. 4, but could also be of the type shown in FIG. 2 and 3 or could take the form of a tooth sleeve as shown in FIG. 5 or otherwise, is hereby mounted to the female part 60 by means of an attachment piece 67. The attachment piece 67 is snapped onto the female portion 60 around the circumferential rib bounding the receiving slot 62. This can be achieved, for example, by designing the lower end of the attachment 67 as loose legs 70 or by executing the attachment 67 in two halves or possibly providing it with a single longitudinal section, as a result of which the attachment 67 can be bent open to placing this around the protruding rib on the female part 60. The toothed ring 64 or possibly the toothed sleeve (supported in this case by the anchoring edge 57) is supported on the attachment 67. The toothed ring 64 is held in place by a nut member 68 which can be tightened relative to the attachment part 67 by means of a threaded connection. With a divided or split embodiment of the attachment 67, the nut member 68 will also keep this attachment 67 closed immediately in the circumferential direction. It is optionally also possible to cast the piece 67 to be converted directly in the formation of the pipe part bearing the female end 60 and thus to design it as an integrated whole with the female end part 60.

Advantage of the embodiment according to FIG. 6 is inter alia that the nut member 68 can be screwed loose, wherein the anchoring is then lifted by means of the toothed ring 64 and teeth 65, so that the female end part 60 and male end part 61 can be taken apart for work, for example.

In the embodiment according to Figure 6, the spacers 16 are further attached to the attachment 68. The spacers 16 may optionally also form an integrated whole with the attachment 68.

FIG. 7 shows a variant of the embodiment according to FIG. 6, for corresponding parts the reference numbers from FIG. 6 are increased by 20 by 15. The embodiment according to FIG. 7 differs from that according to FIG.

6 essentially because the attachment 87 is provided with slots 91 at the top, the free end, between which tilt parts 92 bear, on the inside thereof, the toothed ring 84 with teeth 85, and because the tilt parts 92 are tapered in the downward direction and the nut member 88 on the inside is designed in a tapered downward direction in a downward direction. Hereby is achieved that when the nut member 88 is tightened, the tilting parts 92 are pressed inwards and thus press the teeth 85 inwards and press firmly into the outer wall of the male part 81. It will be clear that in this embodiment it is advantageous if the toothed ring 84 is interrupted in the circumferential direction in order to allow a reduction in the diameter of the toothed ring 84 for the purpose of pushing the teeth 85 inward. It will further be clear that in the embodiment according to FIG. 7 use can also be made of a tooth sleeve, such as that in, for example, FIG. 10 or a toothed ring of an other design.

With regard to the toothed rings as shown in, for example, FIG. 8 and 9 and tooth sleeves as shown, for example, in FIG. It should be noted that, for mounting, in particular an internal circumferential groove, these can also be designed in two semi-circular elements, or they can also be provided with a longitudinal section in the circumferential direction in order to reduce the diameter for the purpose. of assembly possible.

5 1015628

Claims (13)

Flue gas discharge channel (10), comprising a first pipe part with a male end (21, 31,41,51,61,81) and a second pipe part with a female end (20,30,50,50,50,60,80) , wherein in the assembled state the male end (21,31,41,51, 61,81) is inserted into the female end (20,30,40,50,60, 80), the first or second pipe part carrying coupling means which are mounted in mounted condition with respect to that first and second pipe part, respectively, and engage on the wall of the second and first pipe part, and wherein the first and / or second pipe part 10 is made of plastic, characterized in that the coupling means extend over the circumference of the flue gas discharge channel comprises distributed teeth (25.35, 45, 55, 65.85.95) which engage in the mounted state in the wall of said second and first pipe part, respectively. Flue gas discharge duct according to claim 1, wherein the teeth (25, 35, 45, 55, 65, 85.95) are provided on a ring (24, 34, interrupted or not interrupted by the first and second pipe part, respectively). 44.64, 84) or sleeve (54). 3. Flue gas discharge channel according to one of the preceding claims, wherein the engagement edges of the teeth (45, 55, 65, 85.95) point obliquely with respect to the insertion direction (S) towards the central axis (5) of the flue gas discharge channel (10) . 4. Flue gas discharge channel (10) according to any one of the preceding claims, wherein the teeth (25, 35.45, 55, 65, 85.95) are of steel or a steel alloy, such as of spring steel. 5. Flue gas discharge duct according to any one of the preceding claims, wherein the wall of said second and first pipe part with which the teeth (25, 35, 45, 55, 65, 85, 95) are interlocked, is made of plastic. 1015r28 The flue gas discharge channel (10) according to any one of the preceding claims, wherein the teeth (25.35, 45, 55, 65, 85, 95) are mounted in the interior of the female end (20.30, 40, 50, 60). 80). Flue gas discharge channel (10) according to one of the preceding claims, wherein the teeth (25,35,45,55,65,85,95) are provided on the inside of a ring (24,34,44) interrupted or not in the circumferential direction (64.84) or sleeve (54) anchored in an inner peripheral slot (22.32, 42.52, 62.82) in the female end (20.30, 40, 50.60, 80). 10 The flue gas discharge channel (10) according to any one of the preceding claims, wherein the coupling means further comprises: - external screw thread (69, 89) at the end of the female part (60, 80); and 15. an internal thread (68, 88) provided with an internal thread (69, 89) provided with the external thread. 9. Flue gas discharge channel according to claim 8, wherein the teeth (65) are supported on a ring (64) enclosed between the nut member (68) and the head end of the female end. 10. Flue gas discharge duct according to claim 8, wherein the end of the female end (60) is provided with longitudinal slots (91) and internally carries the teeth (85), and wherein the nut member (88) of an internal tapping part and / or the female end (60) is provided with an external tapered part such that when the nut member (88) is tightened, the parts (92) of the female end (60) lying between the longitudinal slots (91) are pressed inwards. 11. Flue gas discharge channel according to one of claims 8-10, wherein the external screw thread is provided on an attachment piece (67, 87) mounted on the female end, which is preferably divided in longitudinal direction or has at least one cut. 1015p28 A flue gas exhaust duct according to any of claims 8-10, wherein the female end (60, 80) carries positioning means, such as spacers (16), for positioning and / or mounting the flue gas exhaust duct in a shaft or on a building. 5 The flue gas discharge channel (10) according to any one of the preceding claims, wherein the flue gas discharge channel is connected to a combustion installation (4). 1015 * 28