CA1174028A - Insulated chimney structure - Google Patents
Insulated chimney structureInfo
- Publication number
- CA1174028A CA1174028A CA000409537A CA409537A CA1174028A CA 1174028 A CA1174028 A CA 1174028A CA 000409537 A CA000409537 A CA 000409537A CA 409537 A CA409537 A CA 409537A CA 1174028 A CA1174028 A CA 1174028A
- Authority
- CA
- Canada
- Prior art keywords
- flue
- casing
- metal sheet
- type
- lock joint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F17/00—Vertical ducts; Channels, e.g. for drainage
- E04F17/02—Vertical ducts; Channels, e.g. for drainage for carrying away waste gases, e.g. flue gases; Building elements specially designed therefor, e.g. shaped bricks or sets thereof
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chimneys And Flues (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
An insulated chimney structure of the type compris-ing an outer casing, an inner flue spaced from the casing and made of a metal sheet, and a solid heat insulating material therebetween. The metal sheet of the flue has a pair of longitudinal edges and is folded into a closed cy-linder with its edges connected to each other in a non rigid manner to define a continuous, expansible lock joint. Due to this expansible lock joint, the metal sheet flue may freely expand whenever heated, without radially pressing against the insulating material and outer casing whereby to avoid damage to the chimney structure or draft reduction.
An insulated chimney structure of the type compris-ing an outer casing, an inner flue spaced from the casing and made of a metal sheet, and a solid heat insulating material therebetween. The metal sheet of the flue has a pair of longitudinal edges and is folded into a closed cy-linder with its edges connected to each other in a non rigid manner to define a continuous, expansible lock joint. Due to this expansible lock joint, the metal sheet flue may freely expand whenever heated, without radially pressing against the insulating material and outer casing whereby to avoid damage to the chimney structure or draft reduction.
Description
1~74(~8 The present invention relates to an improved, insulated chimney structure of the type comprising an inner flue, an outer casing spaced from the flue and a solid insulating material therebetween.
Insulated chimney structures of the above mentioned type are well known in the art and commonly used in building construction for use with a furnace, a stove, a fire place or any other appliance requiring a chimney. In such a construction, the chimney is generally made in two parts.
The first one which is located indoor and comes from the appliance and goes to the first floor or ceiling of the building is not insulated and is made of cylindrical, sheet-metal tubings fitted together end to end. The second part of the chimney which extends the first part from the first floor or ceiling either indoor and/or outdoor to above the roof, is usually- made of insulated tubings having the above mentioned structure to protect the wall, ceiling and/or roof structure from the heat of the hot combustion gases and to improve the chimney draft by preventing the hot gases from cooling too fast thus slowing their rising movement.
Insulated chimney structures of the modular type that can be positively engaged with, and attached to, each other for facilitating chimney installation, are also known in the art and commonly used in building construction.
As aforesaid, these known structures each comprise an outer casing, an inner flue coaxial with the casing but spaced apart therefrom and a solid insulating material therebetween. The casing and flue are usually made of metal sheets each having a pair of longitudinal edges and each folded into a closed cylinder with their respective edges rigidly connected to each other to define a continuous, non expansible lock joint or seam. Both metal sheets are of a given length to define a tubular chimney module which is advantageously provided at one end with a male coupling and at the other end with a female coupling positively ~ ' 1~740ZE~
engageable and lockable with the opposite couplings of another module of the same type. Of course, the annular space defined between the flue and casing is filled with the solid insulat-ing material which generally consists of a mixture of silica and mineral wool.
In all these known structures have the above men-tioned advantages of protecting the building structure and improving chimney draft, they all have also a major drawback due to the differential expansion existing between the inner flue, when the same is heated at substantially high temper-atures by the combustion gases, and the outer casing which remains substantially at the same temperature. As can easily be understood, when the inner flue made of metal sheet is heated by the combustion gases from the appliance, it undergoes a radial expansion. However, as the outer casing does not undergo the same expansion and the solid insulating material is not compressible or very little only, the surface of the inner flue warps , the outer casing tears or the lock joint of the flue or casing breaks. In all cases, the chimney structure is damaged and the draft is reduced. In some critical cases, the chimney may even become a fire hazard for the building.
The object of the present is to provide an improved insulated chimney structure which overcomes the above mentioned drawback.
In accordance with the invention, this object is achieved in a chimney structure of the above mentioned type wherein the longitudinal edges of the metal sheet flue are connected to each other in a non rigid manner to make the continuous lock joint of the flue expansible.
Preferably, the longitudinal edges of the flue are both bent back over themselves to form a pair of oppositely directed U-shaped hooks engaged one inside the other to form the expansible lock joint.
1~74~2~3 As can be easily understood, this improved struc-ture allows the metal sheet flue to freely expand whenever it is heated, without radially pressing against the insulating material and the outer casing. Thus, this improved structure advantageously prevent all the structural damages mentioned hereinabove.
The invention will be better understood with refe-rence to the following non restrictive description of a preferred embodiment thereof, taken in connection with the accompanying drawings wherein:
Fig. 1 is a perspective view of a length of an insulated chimney structure according to the invention;
Fig. 2 is a side elevational, cross-section, view of a wall of the chimney length shown in Fig. l;
Fig. 3 is a top plan view in cross-section of the chimney length shown in Fig. l; and Figs. 4a and 4b are partial, perspective views of the lock joints of the flue and casing of the chimney length shown in Fig. 1, respectively.
The insulated chimney length 1 as shown in Fig. 1, is of the modular type. As every chimney length of this type, it comprises an outer casing 5 and an inner flue 7 spaced from the casing.
The casing 5 and flue 7 are both made of metal sheets. These sheets can be made of stainless steel or of any other metal resistant to heat and corrosion.
The metal sheet forming the casing 5 has a pair of longitudinal edges. This metal sheet is folded into a closed cylinder and its longitudinal edges are connected to each other to define a continuous, non expansible lock joint or seam 23. As shown in greater detail Figs. 3 and 4b, the joint 23 is preferably of the double type, with the edges 29 and 31 of the casing folded back upon themselves to form a pair of oppositily directed U-shaped hooks that 1~74(~2~3 are engaged one inside the other and both locked in a rigid manner by a pair of abutment edges 33 and 35 obtained by radially bending the metal sheets over the U-rounded ends of the U-shaped hooks 29 and 31. The joint 23 can be made by cold-forming or by any other method known for shaping metal sheet.
The metal sheet forming the flue 7 also has a pair of longitudinal edges. This metal sheet is folded into a closed cylinder having a diameter smaller than that of the casing 5. The longitudinal edges of the flue are connected to each other to define a continuous, expansible lock joint 21 as will be described in greater detail hereinafter.
The flue 7 is coaxially positioned inside the casing 5 and connected thereto by a pair of braces which are shaped at one end into an annular cap 9 and, at the other end, into an annular bottom 11, respectively. The cap 9 and bottom 11 can be made of stainless steel and be attached to the flue and casing by means of rivets 17 and 19 of stainless steel and/or by means of spot welds 17'.
As can easily be understood, the casing 5, flue 7, annular cap 9 and annular bottom 11 altogether define a closed annular volume forming the body of the chimney length, which volume is filled with a solid insulating material 3 to produce a complete module. As solid insulating material, use can be made of a mixture of silica with mineral wool or of any other heat resistant, insulating material or powder.
This insulation advantageously protects the wall, ceiling and/or roof structure through which the chimney module 1 passes, from the heat of the combustion gases passing through the flue 5. This insulation also improves the draft of the whole chimney made from module 1 by preventing the combustion gases passing through the flue from cooling too fast before they leave the top of the chimney, which cooling 1:~'74~
would slow down their rising movement.
To facilitate the installation of a chimney to a building construction, each module 1 is advantageously provided at one end with a male coupling and at the other end with a female coupling. Each of these couplings are of course sized to match when fitted into one another.
In the illustrated embodiment, the male coupling is formed by the cap 9 while the female coupling is formed by the bottom 11. Of course, the cap and bottom are appropriately sized to match with the opposite couplings of another module of the same inner and outer diameters.
advantageously, the cap 9 and bottom 11 are each provided with punched out fingers 13 and 15 which interlock when the couplings are fit together whereby securely joining adjacent chimney modules together.
As aforesaid, the longitudinal edges of the flue 7 are connected to each other to define a continuous, expansible lock joint 21.
Referring now to Figs. 3 and 4a, the edges 25 and 27 of the flue are bent back over themselves to form a pair of oppositely directed U-shaped hooks that are engaged one inside the other.
Contrary to the joint 23 of the casing 5, the joint 21 of the flue is not locked in a rigid manner by a pair of abutment edges such as 33, 35 of casing 5 or any other means. In contrast, the joint 21 is allowed freely to expand in a circumferential direction whenever the flue is heated, to prevent radial compression of the insulating material 3 and thus radial pressure applied against the outer casing 5 which is of course heated at a substantially lower tem-perature due to the material 3 and thus undergoes a substan-tially smaller expansion.
This in turn prevents the surface of the inner flue 7 from warping;
1~7~21~3 and the lock joint 21 from breakin~, all o~ these struc-tural damages constituting sure fire hazars for the building in which the chimney is installed.
Of course, the expansible lock joint 21 can be made in any other manner, provided it remains expansible circumferentialy to absorb radial expansion of the flue when the chimney is in operation.
.
Insulated chimney structures of the above mentioned type are well known in the art and commonly used in building construction for use with a furnace, a stove, a fire place or any other appliance requiring a chimney. In such a construction, the chimney is generally made in two parts.
The first one which is located indoor and comes from the appliance and goes to the first floor or ceiling of the building is not insulated and is made of cylindrical, sheet-metal tubings fitted together end to end. The second part of the chimney which extends the first part from the first floor or ceiling either indoor and/or outdoor to above the roof, is usually- made of insulated tubings having the above mentioned structure to protect the wall, ceiling and/or roof structure from the heat of the hot combustion gases and to improve the chimney draft by preventing the hot gases from cooling too fast thus slowing their rising movement.
Insulated chimney structures of the modular type that can be positively engaged with, and attached to, each other for facilitating chimney installation, are also known in the art and commonly used in building construction.
As aforesaid, these known structures each comprise an outer casing, an inner flue coaxial with the casing but spaced apart therefrom and a solid insulating material therebetween. The casing and flue are usually made of metal sheets each having a pair of longitudinal edges and each folded into a closed cylinder with their respective edges rigidly connected to each other to define a continuous, non expansible lock joint or seam. Both metal sheets are of a given length to define a tubular chimney module which is advantageously provided at one end with a male coupling and at the other end with a female coupling positively ~ ' 1~740ZE~
engageable and lockable with the opposite couplings of another module of the same type. Of course, the annular space defined between the flue and casing is filled with the solid insulat-ing material which generally consists of a mixture of silica and mineral wool.
In all these known structures have the above men-tioned advantages of protecting the building structure and improving chimney draft, they all have also a major drawback due to the differential expansion existing between the inner flue, when the same is heated at substantially high temper-atures by the combustion gases, and the outer casing which remains substantially at the same temperature. As can easily be understood, when the inner flue made of metal sheet is heated by the combustion gases from the appliance, it undergoes a radial expansion. However, as the outer casing does not undergo the same expansion and the solid insulating material is not compressible or very little only, the surface of the inner flue warps , the outer casing tears or the lock joint of the flue or casing breaks. In all cases, the chimney structure is damaged and the draft is reduced. In some critical cases, the chimney may even become a fire hazard for the building.
The object of the present is to provide an improved insulated chimney structure which overcomes the above mentioned drawback.
In accordance with the invention, this object is achieved in a chimney structure of the above mentioned type wherein the longitudinal edges of the metal sheet flue are connected to each other in a non rigid manner to make the continuous lock joint of the flue expansible.
Preferably, the longitudinal edges of the flue are both bent back over themselves to form a pair of oppositely directed U-shaped hooks engaged one inside the other to form the expansible lock joint.
1~74~2~3 As can be easily understood, this improved struc-ture allows the metal sheet flue to freely expand whenever it is heated, without radially pressing against the insulating material and the outer casing. Thus, this improved structure advantageously prevent all the structural damages mentioned hereinabove.
The invention will be better understood with refe-rence to the following non restrictive description of a preferred embodiment thereof, taken in connection with the accompanying drawings wherein:
Fig. 1 is a perspective view of a length of an insulated chimney structure according to the invention;
Fig. 2 is a side elevational, cross-section, view of a wall of the chimney length shown in Fig. l;
Fig. 3 is a top plan view in cross-section of the chimney length shown in Fig. l; and Figs. 4a and 4b are partial, perspective views of the lock joints of the flue and casing of the chimney length shown in Fig. 1, respectively.
The insulated chimney length 1 as shown in Fig. 1, is of the modular type. As every chimney length of this type, it comprises an outer casing 5 and an inner flue 7 spaced from the casing.
The casing 5 and flue 7 are both made of metal sheets. These sheets can be made of stainless steel or of any other metal resistant to heat and corrosion.
The metal sheet forming the casing 5 has a pair of longitudinal edges. This metal sheet is folded into a closed cylinder and its longitudinal edges are connected to each other to define a continuous, non expansible lock joint or seam 23. As shown in greater detail Figs. 3 and 4b, the joint 23 is preferably of the double type, with the edges 29 and 31 of the casing folded back upon themselves to form a pair of oppositily directed U-shaped hooks that 1~74(~2~3 are engaged one inside the other and both locked in a rigid manner by a pair of abutment edges 33 and 35 obtained by radially bending the metal sheets over the U-rounded ends of the U-shaped hooks 29 and 31. The joint 23 can be made by cold-forming or by any other method known for shaping metal sheet.
The metal sheet forming the flue 7 also has a pair of longitudinal edges. This metal sheet is folded into a closed cylinder having a diameter smaller than that of the casing 5. The longitudinal edges of the flue are connected to each other to define a continuous, expansible lock joint 21 as will be described in greater detail hereinafter.
The flue 7 is coaxially positioned inside the casing 5 and connected thereto by a pair of braces which are shaped at one end into an annular cap 9 and, at the other end, into an annular bottom 11, respectively. The cap 9 and bottom 11 can be made of stainless steel and be attached to the flue and casing by means of rivets 17 and 19 of stainless steel and/or by means of spot welds 17'.
As can easily be understood, the casing 5, flue 7, annular cap 9 and annular bottom 11 altogether define a closed annular volume forming the body of the chimney length, which volume is filled with a solid insulating material 3 to produce a complete module. As solid insulating material, use can be made of a mixture of silica with mineral wool or of any other heat resistant, insulating material or powder.
This insulation advantageously protects the wall, ceiling and/or roof structure through which the chimney module 1 passes, from the heat of the combustion gases passing through the flue 5. This insulation also improves the draft of the whole chimney made from module 1 by preventing the combustion gases passing through the flue from cooling too fast before they leave the top of the chimney, which cooling 1:~'74~
would slow down their rising movement.
To facilitate the installation of a chimney to a building construction, each module 1 is advantageously provided at one end with a male coupling and at the other end with a female coupling. Each of these couplings are of course sized to match when fitted into one another.
In the illustrated embodiment, the male coupling is formed by the cap 9 while the female coupling is formed by the bottom 11. Of course, the cap and bottom are appropriately sized to match with the opposite couplings of another module of the same inner and outer diameters.
advantageously, the cap 9 and bottom 11 are each provided with punched out fingers 13 and 15 which interlock when the couplings are fit together whereby securely joining adjacent chimney modules together.
As aforesaid, the longitudinal edges of the flue 7 are connected to each other to define a continuous, expansible lock joint 21.
Referring now to Figs. 3 and 4a, the edges 25 and 27 of the flue are bent back over themselves to form a pair of oppositely directed U-shaped hooks that are engaged one inside the other.
Contrary to the joint 23 of the casing 5, the joint 21 of the flue is not locked in a rigid manner by a pair of abutment edges such as 33, 35 of casing 5 or any other means. In contrast, the joint 21 is allowed freely to expand in a circumferential direction whenever the flue is heated, to prevent radial compression of the insulating material 3 and thus radial pressure applied against the outer casing 5 which is of course heated at a substantially lower tem-perature due to the material 3 and thus undergoes a substan-tially smaller expansion.
This in turn prevents the surface of the inner flue 7 from warping;
1~7~21~3 and the lock joint 21 from breakin~, all o~ these struc-tural damages constituting sure fire hazars for the building in which the chimney is installed.
Of course, the expansible lock joint 21 can be made in any other manner, provided it remains expansible circumferentialy to absorb radial expansion of the flue when the chimney is in operation.
.
Claims (6)
1. In a heat insulated chimney structure of the type comprising:
- an outer casing;
- an inner flue spaced from said casing and made of a metal sheet, said metal sheet having a pair of longi-tidinal edges and being folded into a closed cylinder with the said edges connected to each other to define a conti-nuous lock joint, and - a solid heat insulating material between said casing and flue, the improvement wherein the longitudinal edges of the flue are connected to each other in a non rigid manner to make the continuous lock joint expansible.
- an outer casing;
- an inner flue spaced from said casing and made of a metal sheet, said metal sheet having a pair of longi-tidinal edges and being folded into a closed cylinder with the said edges connected to each other to define a conti-nuous lock joint, and - a solid heat insulating material between said casing and flue, the improvement wherein the longitudinal edges of the flue are connected to each other in a non rigid manner to make the continuous lock joint expansible.
2. The improved structure of claim 1, wherein the longitudinal edges of the flue are both bent back over themselves to form a pair of oppositely directed U-shaped hooks engaged one inside the other to form the said expansible lock joint.
3. The improved structure of claim 2, wherein the casing is made of a metal sheet, said metal sheet having a pair of longitudinal edges and being folded into a closed cylinder with the said edges of said casing rigidly connec-ted to each other to define a continuous, non expansible lock joint.
4. The improved structure of claim 3, wherein the casing and flue are of a given length to define a tubular chimney module having the said length, said module being provided at one end with a coupling of the male type and at the other end with a coupling of the female type, whereby each coupling of a module may be engaged with a coupling of the opposite type of another module of the same size and type.
5. The improved structure of claim 4, wherein said male and female couplings are each provided with a punched out finger to firmly secure them to an adjacent module of the same type and size.
6. The improved structure of claim 2, 3 or 4, wherein the solid insulating material is a mixture of silica and mineral wool and the casing and flue are made of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000409537A CA1174028A (en) | 1982-08-16 | 1982-08-16 | Insulated chimney structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000409537A CA1174028A (en) | 1982-08-16 | 1982-08-16 | Insulated chimney structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1174028A true CA1174028A (en) | 1984-09-11 |
Family
ID=4123414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000409537A Expired CA1174028A (en) | 1982-08-16 | 1982-08-16 | Insulated chimney structure |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1174028A (en) |
-
1982
- 1982-08-16 CA CA000409537A patent/CA1174028A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |