| JP2009156492 | LINING MATERIAL REMOVING METHOD FOR STACK AND ITS DEVICE |
| WO/2005/106331 | WATER HEATER RECOVERING HEAT FROM A FLUE GAS FLOW |
| WO/2001/038788 | STACK STRUCTURE |
KLOPPENBURG, Jan, Wiebe (LJ Putten, NL-3881, NL)
| Claims 1. Method for manufacturing a flue gas passage section by means of a separate footing, wherein the flue gas passage section is provided with a circumferential metal inner jacket, a circumferential metal outer jacket and a circumferential intermediate space between the inner jacket and the outer jacket, wherein the intermediate space is filled with a flexible or resilient heat insulation blanket situated against the inner jacket and a solid cement-bonded insulation mass arranged between the insulation blanket and the outer jacket, wherein the footing is provided with an inner wall, an outer wall and a bottom wall connecting the inner wall and the outer wall to each other, wherein the inner wall and the outer wall rise from the bottom wall to form a circumferential placement channel, wherein with respect to the bottom wall the inner wall is higher than the outer wall, wherein the method comprises placing the footing on a base, in its axial longitudinal direction placing the inner jacket upright on the footing, wherein an outer end of the inner jacket comes in abutting contact within the placement channel with the inner wall and preferably the bottom wall, arranging the insulation blanket against the inner jacket, in its axial longitudinal direction placing the outer jacket upright on the footing, wherein an outer end of the outer jacket comes in abutting contact within the placement channel with the outer wall and preferably the bottom wall, filling the intermediate space with the cement-bonded insulation mass and at least partially letting the cement-bonded insulation mass harden. 2. Method according to claim 1 , wherein measured with respect to the bottom wall, the inner wall is at least twice as high as the outer wall. 3. Method according to claim 2, wherein measured with respect to the bottom wall, the inner wall is at least three times as high as the outer wall. 4. Method according to any one of the preceding claims, wherein the inner jacket enters into a press fit with the inner wall. 5. Method according to any one of the preceding claims, wherein the outer jacket enters into a press fit with the outer wall. 6. Method according to any one of the preceding claims, wherein the footing is manufactured of synthetic material, preferably polystyrene or APET. 7. Assembly of a flue gas passage section, a separate coupling strap for in the extension of the flue gas passage section coupling an equal or identical flue gas passage section, and a separate coupling strap carrier with which the flue gas passage section carries the coupling strap, wherein the flue gas passage section is provided with a circumferential metal inner jacket, a circumferential metal outer jacket and a circumferential intermediate space between the inner jacket and the outer jacket, wherein the intermediate space over the axial longitudinal direction of the flue gas passage section is filled with an insulating material up to a height at which the insulating material is recessed from a first outer end of the flue gas passage section in order to form a circumferential accommodation space between the inner jacket and the outer jacket which space is accessible in axial direction, for fitting or slightly clamping accommodation of an opposite second outer end of the flue gas passage section to be coupled thereto, wherein the coupling strap carrier at least partially covers the first outer end and the coupling strap extends in a circumferential manner around the part of the outer jacket bounding the accommodation space. 8. Assembly according to claim 7, wherein at the side facing away from the first outer end the coupling strap carrier is provided with a radially extending supporting edge onto which a circumferential engagement edge of the coupling strap that is oriented towards the flue gas passage section engages. 9. Assembly according to claim 8, wherein the coupling strap carrier is provided with a flexible locking corrugation between the supporting edge and the first outer end, wherein the engagement edge is confined in axial direction between the supporting edge and the locking corrugation. 10. Assembly according to any one of the claims 7-9, wherein the coupling strap carrier is provided with an inner wall that abuts the outer side of the inner jacket, an outer wall that abuts the inner side of the outer jacket, and a bottom wall that preferably abuts the insulating material. 1 1. Assembly according to claim 10, wherein the inner wall, the outer wall and the bottom wall define an internal hand engagement space of the coupling strap carrier. 12. Assembly according to any one of the claims 7-1 1 , wherein the coupling strap carrier is provided with a sealing wall extending within the inner jacket and recessed from the first outer end, which sealing wall seals off the inner jacket. 13. Assembly according to any one of the claims 7-12, comprising a separate footing at the opposite second outer end of the flue gas passage section with which the flue gas passage section in its axial longitudinal direction can be placed upright on a base, wherein the footing is provided with a circumferential shock bumper projecting in radial direction from the outer jacket. 14. Assembly according to claim 13, wherein the coupling strap carrier is provided with a carrier wall and a circumferential pilot edge for bringing and carrying the footing straight above the coupling strap carrier which footing is of an equal or identical assembly stacked onto the assembly. 15. Assembly according to claim 13 or 14, wherein the footing is provided with a circumferential placement channel in which the second outer end is accommodated, and a sealing wall extending within the inner jacket and recessed from the second outer end, which sealing wall seals off the inner jacket. 16. Assembly according to claim 7-15, wherein the coupling strap carrier and/or the footing is manufactured of synthetic material, preferably polystyrene or APET. |
BACKGROUND OF THE INVENTION
The invention relates to a flue gas passage section. By means of coupling such sections in each other's extension a flue gas passage can be built up on which for instance a wood-fired hearth or stove can be connected. Due to possible risk of fire, it is important that the flue gas passage is capable of passing the hot flue gasses through under acceptably low heat discharge to the immediate surrounding area.
A known flue gas passage section is provided with an inner jacket and an outer jacket that are concentrically positioned with respect to each other, wherein the space between the inner jacket and the outer jacket is filled up with a flexible insulation blanket and an insulation mass in the form of a hardened mixture of cement and polystyrene granules in order to form a heat-repellent layer.
In the manufacturing of the known flue gas passage section a footing is placed on a base. The inner jacket and the outer jacket are placed on the footing to keep them mutually positioned, after which a hardening mixture of cement and polystyrene granules is cast to form the insulation mass up to a level at which at the upper side of the flue gas passage section between the inner jacket and the outer jacket an annular space is left in which the next flue gas passage section can be inserted. Although the footing keeps a large part of the mixture inside, a part leaks away along the footing and hardens against the inner jacket or outer jacket. As a result the insulation mass that has leaked away and hardened is a hindrance in the mounting of the discharge channel and the filling level in vertical direction is slightly undefined. The flue gas passage section is vulnerable and is therefore carefully wrapped in wrapping materials. Despite all this it happens that the flue gas passage section suffers transportation damage, such as dents along the edges that connect to each other, particularly at the side of the annular space. When a flue gas passage is built up with the damaged flue gas passage section, mounting may be difficult or lead to flue gas leakages.
It is an object of the invention to provide a method for the manufacturing of the flue gas passage section, wherein the undefined leaking away of hardening insulation mass is counteracted.
It is an object of the invention to provide an improved wrapping device for a flue gas passage section.
SUMMARY OF THE INVENTION
According to one aspect, the invention provides a method for manufacturing a flue gas passage section by means of a separate footing, wherein the flue gas passage section is provided with a circumferential metal inner jacket, a circumferential metal outer jacket and a circumferential intermediate space between the inner jacket and the outer jacket, wherein the intermediate space is filled with a flexible or resilient heat insulation blanket situated against the inner jacket and a solid cement-bonded insulation mass arranged between the insulation blanket and the outer jacket, wherein the footing is provided with an inner wall, an outer wall and a bottom wall connecting the inner wall and the outer wall to each other, wherein the inner wall and the outer wall rise from the bottom wall to form a circumferential placement channel, wherein with respect to the bottom wall the inner wall is higher than the outer wall, wherein the method comprises placing the footing on a base, in its axial longitudinal direction placing the inner jacket upright on the footing, wherein an outer end of the inner jacket comes in abutting contact within the placement channel with the inner wall and preferably the bottom wail, arranging the insulation blanket against the inner jacket, in its axial longitudinal direction placing the outer jacket upright on the footing, wherein an outer end of the outer jacket comes in abutting contact within the placement channel with the outer wall and preferably the bottom wall, filling the intermediate space with the cement-bonded insulation mass and at least partially letting the cement-bonded insulation mass harden.
The difference in height between the inner wall and the outer wall of the placement channel forces possibly escaping not yet hardened cement-bonded insulation mass to seep away to the outside, as a result of which the inside of the inner jacket can remain free from hardened insulation mass.
In one embodiment, measured with respect to the bottom wall, the inner wall is at least twice as high as the outer wall and preferably at least three times as high as the outer wall.
The inner jacket can connect to the footing all round in a watertight manner when the inner jacket enters into a press fit with the inner wall. This can for instance be realised by arranging a conicity of 0-3 degrees in the inner wall.
Alternatively or additionally the outer jacket enters into a press fit with the outer wall. This can for instance be realised by arranging a conicity of 0-3 degrees in the outer wall.
In one embodiment the footing is manufactured of synthetic material, preferably polystyrene or APET, as a result of which the cement-bonded insulation mass adheres badly to the footing. After the mixture has hardened, the footing can easily be removed again.
According to a further aspect, the invention furthermore provides an assembly of a flue gas passage section, a separate coupling strap for in the extension of the flue gas passage section coupling an equal or identical flue gas passage section, and a separate coupling strap carrier with which the flue gas passage section temporarily carries the coupling strap, wherein the flue gas passage section is provided with a circumferential metal inner jacket, a circumferential metal outer jacket and a circumferential intermediate space between the inner jacket and the outer jacket, wherein the intermediate space over the axial longitudinal direction of the flue gas passage section is filled with an insulating material up to a height at which the insulating material is recessed from a first outer end of the flue gas passage section in order to form a circumferential accommodation space between the inner jacket and the outer jacket which space is accessible in axial direction, for fitting or slightly clamping accommodation of an opposite second outer end of the flue gas passage section to be coupled thereto, wherein the coupling strap carrier at least partially covers the first outer end and the coupling strap extends in a circumferential manner around the part of the outer jacket bounding the accommodation space.
The inner jacket and particularly the outer jacket situated around it, at the location of the first outer end, are relatively weak as there is no insulating material present there. Damage, such as a radially inwardly oriented dent in the outer jacket, may result in accommodation of an opposite second outer end of the flue gas passage section to be coupled thereto in the accommodation space being impeded. The coupling strap carrier at feast partially covers the first outer end and the coupling strap extends circumferentially around the part of the outer jacket that bounds the accommodation space, as a result of which the flue gas passage section at the location of the first outer end is provided with additional protection until the moment of installation. Transportation damage to the first outer end can thus be counteracted.
In one embodiment, at the side facing away from the first outer end, the coupling strap carrier is provided with a radially extending supporting edge onto which a circumferential engagement edge of the coupling strap that is oriented towards the flue gas passage section engages. In that way the coupling strap can thus be slid over the coupling strap carrier in order to be secured.
In one embodiment thereof the coupling strap carrier is provided with a flexible locking corrugation between the supporting edge and the first outer end, wherein the engagement edge is confined in axial direction between the supporting edge and the locking corrugation. The engagement edge of the coupling strap can then be slid over and past the flexible locking corrugation in order to become confined between the locking corrugation and the supporting edge.
In one embodiment the coupling strap carrier is provided with an inner wall that abuts the outer side of the inner jacket, an outer wall that abuts the inner side of the outer jacket, and a bottom wall that preferably abuts the insulating material. The coupling strap carrier thus locks the position of the inner jacket with respect to the outer jacket, and in the preferred embodiment thereof also keeps the insulating material in its place.
The assembly can be taken hold of by hand at the first outer end without injuring oneself on the sharp end edge of the jackets when the inner wall, the outer wall and the bottom wall define an internal hand engagement space of the coupling strap carrier.
In one embodiment the coupling strap carrier is provided with a sealing wall extending within the inner jacket and recessed from the first outer end, which sealing wall seals off the inner jacket.
In one embodiment the assembly comprises a separate footing at the opposite second outer end of the flue gas passage section with which the flue gas passage section in its axial longitudinal direction can be placed upright on a base, wherein the footing is provided with a circumferential shock bumper projecting in radial direction from the outer jacket. The assemblies can be transported with the flue gas passage section positioned upright and adjacent to each other, wherein the shock bumper is able to counteract transportation damage to the second outer end.
The assemblies can in that case also be stacked onto each other when the coupling strap carrier is provided with a carrier wall and a circumferential pilot edge for bringing and carrying the footing straight above the coupling strap carrier which footing is of an equal or identical assembly stacked onto the assembly.
In one embodiment the footing is provided with a circumferential placement channel in which the second outer end is accommodated, and a sealing wall extending within the inner jacket and recessed from the second outer end, which sealing wall seals off the inner jacket.
In one embodiment that can be manufactured at low costs, the coupling strap carrier and/or the footing is manufactured of synthetic material, preferably polystyrene or APET.
SHORT DESCRIPTION OF THE DRAWINGS
The invention will be elucidated on the basis of a number of exemplary embodiments shown in the attached drawings, in which:
Figure 1 shows an isometric view of an assembly of a flue gas passage section, a footing and an upper part according to an embodiment of the invention;
Figure 2 shows an isometric view of all parts of the assembly according to figure 1 , taken apart from each other;
Figure 3 shows an isometric view of the footing and the upper part according to figure 1 , shown straight above one another;
Figure 4 shows an isometric view of a stack of several identical assemblies according to figure 1 , and
Figure 5 shows a longitudinal section of the assembly according to figure 1 , a part of the stack according to figure 4 being schematically shown.
DETAILED DESCRIPTION OF THE DRAWINGS
Figure 1 and 5 show an assembly 1 in isometric view and in longitudinal section, respectively, comprising a footing 20 on a base 90, a flue gas passage section 10 placed with the centre line S vertically upright on the base 20, an upper part 40 at the opposite upper side of the flue gas passage section 10, and a coupling strap 50 carried by the upper part 40. The various components are also shown in figures 2 and 3 and will be discussed in more detail below.
The flue gas passage section 10 is provided with a straight cylindrical stainless steel inner jacket 14 having a circumferential lower edge 19 and a circumferential upper edge 15 and a straight cylindrical stainless steel outer jacket 1 1 having a circumferential lower edge 13 and a circumferential upper edge 12 that are positioned concentrically with respect to each other as a result of which a circumferential intermediate space 16 is defined. The intermediate space 16 is filled with a flexible or resilient heat insulation blanket 18 wrapped around the inner jacket 14 and resistant to temperatures of over 400 degrees Celsius, and a solid, shape-retaining insulation mass 17 in the form of a hardened mixture of cement and polystyrene granules. The insulation mass 17 is relatively lightweight due to the polystyrene granules. The polystyrene granules are also called blown or expanded polystyrene. At the bottom side the insulation blanket 18, the insulation mass 17, the lower edge 19 of the inner jacket 14 and the lower edge 13 of the outer jacket 1 1 are situated in the same plane. At the upper side the upper edge 15 of the inner jacket 14 and the upper edge 12 of the outer jacket 1 1 are situated in the same plane. The insulation blanket 18 and the insulation mass 17 are recessed up to the same level from the upper edge 15 of the inner jacket 14 and the upper edge 12 of the outer jacket 1 1 , and at that location are covered with a circumferential sealing layer 56 of the same material as the heat insulation blanket 18. The sealing layer 56 is also situated recessed for together with the outer jacket 1 1 and the inner jacket 14 forming a circumferential accommodation space 30 that is accessible in radial direction, for fitting slightly clamping accommodation of the opposite end of a next flue gas passage section 10 discussed above.
The footing 20 is made of synthetic material, in this example by means of vacuum moulding or injection moulding polystyrene or APET. The footing 20 is provided with a straight sealing wall 28, and an inner wall 21 , an outer wall 23 and a bottom wall 22 connecting the inner wall 21 and the outer wall 23 to each other to form a circular circumferential placement channel 24 in which the bottom end of the flue gas passage section 10 is accommodated. In outward direction the outer wall 23 of the footing 20 merges In a shock edge or shock bumper 25 extending in radial direction. At the bottom side the inner wall 21 comprises a first inner wall half 21 a and consecutive thereto a second inner wall half 21 b. The first inner wall half 21 a and the outer wall 23 are removed from each other from the bottom wall 22 at a conicity of less than 3 degrees with respect to the centre line S, and the second inner wall half 21 b with respect thereto has a larger conicity to define a circumferential pilot surface. Measured from the bottom wall 22 the inner wall 21 in this example has a height that is trice as large as the height of the outer wall 23. In the placed condition of the footing 20 the inner wall half 21 a abuts the inner side of the inner jacket 14 in a clamping or pressed manner and the outer wall 23 abuts the outer side of the outer jacket 1 1 in a clamping or pressed manner. The lower edges 13, 19 support on the bottom wall 22.
The upper part 40 is manufactured of synthetic material, in this example by means of vacuum moulding or injection moulding polystyrene or APET. The upper part 40 comprises a straight sealing wall 42, and a circumferential interrupted inner wall 45, a circumferential interrupted outer wall 43 and a circumferential interrupted bottom wall 41 connecting the inner wall 45 and the outer wall 43 to each other. The inner wall 45 and the outer wall 43 in the direction of the bottom wall 41 comprise a first inner wall half 45a and first outer wall half 43a, respectively, and consecutive thereto a second inner wall half 45b and second outer wall half 43b, respectively. The outer wall 43 via a radially extending circumferential upper wall 57 merges into a downwardly oriented circumferential shielding wall 58. At the free end the shielding wall 58 merges into a radially extending supporting edge 44 having a circular outer contour, and which is provided halfway with several radially extending locking corrugations 59 that are circumferentially divided. The first outer wall half 43a and the first inner wall half 45a towards the lower edge 41 are at an conicity of less than 3 degrees with respect to the centre line S to each other, and the second inner wall half 45b and the second outer wall half 43b with respect thereto have a larger conicity in order to define circumferential pilot surfaces. The upper part 40 is provided with three stacking bodies 60 distributed all round and at the level of the supporting edges 44 each having a support surface 61 and two downwardly inclined oriented side surfaces 62 that interrupt the inner wall 45, the outer wall 43 and the bottom wall 41. At the location of the stacking bodies 60 the circumferential upper wall 57 is provided with an elevation 63.
In the placed condition of the upper part 40 the first inner wall half 45a abuts the outer side of the inner jacket 14 in a clamping or pressed manner, the bottom wall 41 abuts the sealing layer 56, the first outer wall half 43a abuts the inner side of the outer jacket 1 1 in a clamping manner and the shielding wail 58 is situated broadly over the outer side of the outer jacket 1 1. The sharp upper edge 15 of the inner jacket 14 and the sharp upper edge 12 of the outer jacket 1 1 are thus fully covered. In the stacked condition of the assemblies 1 the footing 20 with the upper wall 22 supports on the support surfaces 61 of the upper part 40 situated below it, wherein the elevations 63 keep the footing 20 centred on the upper part 40.
The coupling strap 50 is intended for coupling two flue gas passage sections 10 that are situated in each other's extension and partially inserted into each other or keeping them coupled. The coupling strap 50 comprises a circumferential stainless steel clamping strip 51 with in the middle a circumferential centring edge 52 and behind the sides an inwardly facing, circumferential engagement edge 53. The clamping strip 51 is provided with two screw closures 55 in order to reduce the diameter of the clamping strip 51. In its coupling stand-by position, the coupling strap 50 is slid over the shielding wall 58 and the supporting edge 44 and with the upper circumferential engagement edge 53 is suspended from the supporting edge 44, being kept confined behind the locking corrugations 59 passed by. The coupling strap 50 therefore extends along and around the part of the outer jacket 1 1 that bounds the circumferential accommodation space 30 of the flue gas passage section 10, which part is relatively vulnerable as the intermediate space 16 between the outer jacket 1 1 and the inner jacket 14 is not filled at that location. When manufacturing the flue gas passage section 10 first the footing 20 is placed on a base 90. Subsequently the inner jacket 14 is provided with the insulation blanket 18 and placed in direction B in the placement channel 24. Then the outer jacket 1 1 is placed in direction C in the placement channel 24 and from above in direction D a hardening mixture of cement and polystyrene granules is cast to form the insulation mass 17, wherein due to the difference in height between the inner wall 21 and the outer wall 23 of the footing 20 a fraction of cement will only flow away to the outside in direction E. The footing 20 remains connected to the flue gas passage section 10. After the insertion of the sealing layer 56 the upper part 40 is placed from above, after which from above the coupling strap 50 is slid over the upper part 40. After that the assembly 1 is ready for transportation to the location of installation. Here the assemblies 1 can be stacked onto one another as shown in figure 4 and due to the cylindrical shapes be placed next to each other in a compact way. The assemblies 1 can be handled by placing the fingers behind the inner walls 21 , 45 of the footings 20 and the upper parts 40, wherein the fingers may press against the sealing walls 28, 14.
The above description is included to illustrate the operation of preferred embodiments of the invention and not to limit the scope of the invention. Starting from the above explanation many variations that fall within the spirit and scope of the present invention will be evident to an expert.