GB2493983A - A duct - Google Patents

A duct Download PDF

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Publication number
GB2493983A
GB2493983A GB201114809A GB201114809A GB2493983A GB 2493983 A GB2493983 A GB 2493983A GB 201114809 A GB201114809 A GB 201114809A GB 201114809 A GB201114809 A GB 201114809A GB 2493983 A GB2493983 A GB 2493983A
Authority
GB
United Kingdom
Prior art keywords
text
duct
coupling devices
projections
coupling
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.)
Withdrawn
Application number
GB201114809A
Other versions
GB201114809D0 (en
Inventor
Jason Lee
Jeremy David Long
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SF Ltd
Original Assignee
SF Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SF Ltd filed Critical SF Ltd
Priority to GB201114809A priority Critical patent/GB2493983A/en
Publication of GB201114809D0 publication Critical patent/GB201114809D0/en
Priority to JP2011007759U priority patent/JP3176030U/en
Priority to CN 201220026846 priority patent/CN202708405U/en
Publication of GB2493983A publication Critical patent/GB2493983A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
    • F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
    • F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
    • F23C10/10—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/24—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/24—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action
    • F16L37/244—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action the coupling being co-axial with the pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/24—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action
    • F16L37/244—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action the coupling being co-axial with the pipe
    • F16L37/2445—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action the coupling being co-axial with the pipe in which a male cylindrical element is introduced into a female cylindrical element, each element containing several threads axially spaced and circumferentially discontinuous which engage with each other as a result of the rotation of one of the elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J11/00—Devices for conducting smoke or fumes, e.g. flues 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J13/00—Fittings for chimneys or flues 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J13/00—Fittings for chimneys or flues 
    • F23J13/02—Linings; Jackets; Casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J13/00—Fittings for chimneys or flues 
    • F23J13/04—Joints; Connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2213/00—Chimneys or flues
    • F23J2213/20—Joints; Connections
    • F23J2213/202—Joints; Connections between duct or stack sections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2213/00—Chimneys or flues
    • F23J2213/40—Heat insulation fittings

Abstract

A duct comprises first and second duct components 2, 4 which are connected end-to €‘end by coupling devices 6, 8 provided with interengaging projections 18, 28 which are formed by deformation of sheet material of the coupling devices 6, 8 without penetration of the sheet material.

Description

A DUCT
This invention relates to a duct comprising first and second duct components which are interconnected end-to-end, and is particularly, although not exclusively, concerned with such a duct in the form of a chimney, such as a twin-walled chimney.
It is known to assemble twin-walled chimneys from prefabricated chimney sections which are interconnected end-to-end. For this purpose, the chimney sections are provided with respective male and female coupling devices at each end, the sections being interconnected by engaging the male coupling device of one section with the female coupling device of the other section.
In a known chimney system, the male and female coupling devices have circumferential surfaces which fit one within the other and are provided with cooperating projections in the form of barbs which are created by a punching process which cuts through the sheet material of the circumferential surfaces to form projecting cut edges which provide the engaging surfaces of the projections. The cut surfaces are inclined to the circumferential direction of the coupling devices and so cooperate in the manner of a screw thread to draw the coupling devices together upon relative rotation.
A problem with such systems is that, because the projections are formed by cutting through the material of the coupling devices, openings are formed in the coupling devices and these openings permit the ingress of water or moisture between the inner and outer walls of the twin-walled chimneys. This is a particular problem in regions subject to typhoons and other extreme rainfall conditions.
According to the present invention there is provided a duct comprising first and second duct components which are interconnected end-to-end by a coupling arrangement comprising cooperating male and female coupling devices disposed for relative rotation one within the other, the coupling devices comprising circumferential surfaces which are formed from sheet material and are provided with interengaging projections formed by deformation without penetration of the sheet material, the projections on at least one of the coupling devices being elongate and inclined to the circumferential direction.
In an embodiment in accordance with the present invention, the interengaging projections on both of the coupling devices are elongate and inclined to the circumferential direction. The angle of inclination may be any suitable angle which enables proper engagement of the coupling devices and, where the projections on both coupling devices are elongate and inclined to the circumferential direction, the angle of inclination may be equal on the two coupling devices. The angle of inclination may, for example, be not less than 8° and not more than 12° and, in a specific embodiment, may be 100.
The projections on each coupling device may be circumferentially spaced apart by a spacing sufficient to permit the axial passage between the projections of one coupling device of the projections of the other coupling device. The projections on the two coupling devices may have the same profiles as each other. Each projection, on at least one of the coupling devices, may have a generally oblong form comprising side walls which extend parallel to each other and are interconnected at each end by curved end walls. The projections may taper in the outwards direction.
At least one of the coupling devices or duct components may be provided with abutment means which limit relative displacement of the duct components towards each other. Thus, interengagement of the projections in conjunction with contact at the abutment means may create a wedging effect to provide a stable connection between the duct components.
The duct may be a twin-walled duct, with each duct component having spaced-apart inner and outer walls. Each coupling device may be configured to provide a sealed closure between the inner and outer walls of the respective duct component so that the space between the inner and outer walls is substantially isolated from the exterior.
The duct may be a chimney, which may comprise not only the first and second duct components but also further duct components and/or ancillary components such as tee fittings, elbows and support and attachment components.
For a better understanding of the present invention, and to show more clearly how it may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which: Figure us an exploded view of part of a twin-walled chimney; Figure 2 is an end view of one of the components of the chimney of Figure 1; Figure 3 is a partial sectional view of the chimney of Figure 1, when assembled; Figure 4 is a side view of a male coupling device of the chimney of Figure 1; Figure 5 is an end view of the coupling device of Figure 4; Figure 6 is a side view of a female coupling device of the chimney of Figure 1; Figure 7 is an end view of the coupling device of Figure 6; Figure 8 is an enlarged view of part of Figure 4; and Figure 9 is a sectional view taken on the line IX-IX in Figure 8.
Figure 1 shows part of a chimney which comprises a duct assembled from a plurality of prefabricated duct sections or components. Figure 1 shows a first duct component 2 and a second duct component 4 which each have a male coupling device 6 at one end and a female coupling device 8 (Figure 2) at the other end. As indicated in Figure 1, the duct components 2, 4 can be connected together end-to-end by engagement of the male coupling device 6 at one end of the first duct component 2 with the female coupling device 8 at the other end of the second duct component 4. Once engaged with one another, additional security is provided by means of a locking band 10.
The coupling devices 6, 8 are shown in more detail in Figures 4 to 9. Each coupling device, like the duct components 2, 4, is fabricated from sheet material, for example stainless steel. The male coupling component 6 is shown in Figures 4 and 5, and comprises a cylindrical body 12 having an out turned flange 14 at one end and an in turned flange 16 at the other end.
Around the body 12, there is a circumferential array of embossings which form projections 18 on the outer circumferential surface of the body 12.
The female coupling device 8 is shown in Figures 6 and 7 and is of generally complementary form to the male coupling device 6. The female coupling device 8 has a cylindrical body 20 provided with an out turned flange 22 at one end an in turned flange 24 at the other end. A connecting piece 26 extends from the in turned flange 24.
The body 20 is provided with embossings which form projections 28 on its inner circumferential surface. The in turned flange 24 is provided with a series of equally spaced abutments 30 which project into the body 20.
The projections 18 and 28 have substantially the same configuration as each other, and the same number of projections 18,28 are provided on the male and female coupling devices 6, 8. In the embodiment shown in Figures 4 to 7, there are sixteen regularly spaced apart projections 18, 28 on each coupling device 6, 8.
The profile of each projection is shown in more detail in Figures 8 and 9.
Figures Band 9 show the projections 18 of the male coupling device 6, but the projections 28 of the female coupling device 8 are of the same form. As shown in Figure 8, each projection 18 is elongate, of generally oblong form having parallel side walls 32 and curved end walls 34 between them. In the embodiment shown, the end walls 34 are semi-circular.
The projections 18 are inclined to the circumferential direction of the body 12 at an angle a which, in the embodiment shown, is 100.
As can be appreciated from Figure 9, each projection 18 is formed by deformation of the sheet material of the body 12, without penetration of the sheet material. Thus, the projections 18 do not provide a leak path for rainwater or other accumulated moisture such as condensate through the sheet material of the body 12. The projections may, for example, have a height /i in the range 2.5 to 3.5 mm and in a particular embodiment has a height in the range 2.75 to 3.00 mm. The side walls 32 and the end walls 34 are inclined to a line normal to the plane of the body 12, so that the projections 18 have a tapered form.
Figure 3 shows the interconnection of the duct components 2, 4 by means of the coupling devices 6, 8. Each of the duct components 2, 4 is a twin-walled component having an inner wall 36 and an outer wall 38. Each of the coupling devices 6, 8 is crimped by way of the out-turned flange 14, 22, to the outer wall 38 of the respective duct component 2, 4, and secured at the in-turned flange 16 or the connecting piece 26, for example by welding, to the inner wall 36. As shown in Figure 3, the inner wall 36 of the second duct component 4 projects into the inner wall 36 of the first duct component 2, which is flared at its end for this purpose. It will be appreciated therefore that the coupling devices 6, 8 provide unperforated sealing closures between the inner and outer walls 36, 38 at each end of each duct component 2, 4. The annulus defined by the inner and outer walls 36, 38 is thus isolated from both the interior and exterior of the duct component so that there is no possibility of water or moisture ingress into the annulus. The annulus may contain insulation material.
It will be appreciated from Figures 4 to 7 that the spacing, in the circumferential direction, between adjacent ones of the projections 13, 28 is greater than the length of each projection 18, 28 in the circumferential direction. Consequently, it is possible to align the duct components 2, 4 rotationally so they can be advanced axially towards each other with the projections 18, 28 on one of the coupling devices 6, 8 will pass between the corresponding projections of the other coupling device. Once the male coupling device 6 is fully inserted into the female coupling device 8, the in-turned flange 16 of the male coupling device 6 (or the region of the inner wall 36 secured to it) will contact the abutments 30 on the in-turned flange 34 of the female coupling device to prevent any further movement of the duct components 2, 4 towards each other. The duct components 2, 4 can then be rotated relatively to each other to bring the projections 18, 28 on the respective coupling devices 6, 8 into contact with each other, as shown in Figure 3. The inctined orientation of the projections 18, 28 means that the rotation will create a wedging effect, forcing the male coupling device 6 firmly home into contact with the abutments 30. the locking band 10 is then filled over the crimped joints between the flanges 14 and 22 and the respective outer walls 38 in order to hold the assembly firmly together.
A seal 40 may be installed to enhance sealing between the duct components 2, 4.
The present invention thus provides a convenient mechanism for the assembly of ducts, such as chimneys, which provides a secure connection while eliminating any apertures in the coupling devices 6, 8 which could enable water or moisture to penetrate to the annulus between the inner and outer walls 36, 38 of the duct components 2, 4.

Claims (1)

  1. <claim-text>CLAIMS1. A duct comprising first and second duct components which are interconnected end-to-end by a coupling arrangement comprising cooperating male and female coupling devices disposed for relative rotation one within the other, the coupling devices comprising circumferential surfaces which are formed from sheet material and are provided with interengaging projections formed by deformation without penetration of the sheet material, the projections on at least one of the coupling devices being elongate and inclined to the circumferential direction.</claim-text> <claim-text>2. A duct as claimed in claim 1, in which the projections on both of the coupling devices are elongate and inclined to the circumferential direction.</claim-text> <claim-text>3. A duct as claimed in claim 1 or 2, in which the angle of inclination of the projections is not less than 8° and not more than 12°.</claim-text> <claim-text>4. A duct as claimed in any one of the preceding claims, in which the projections on each of the coupling devices are circumferentially spaced apart by a distance sufficient to permit the axial passage of the projections on the other coupling device.</claim-text> <claim-text>5. A duct as claimed in any one of the preceding claims, in which the projections on both of the coupling devices have the same profile.</claim-text> <claim-text>6. A duct as claimed in any one of the preceding claims, in which each projection comprises parallel side walls which are interconnected at each end by curved end wa I Is.</claim-text> <claim-text>7. A duct as claimed in any one of the preceding claims, in which each projection is tapered in the direction away from the respective circumferential surface.</claim-text> <claim-text>8. A duct as claimed in any one of the preceding claims, in which abutment means is provided on at least one of the coupling devices for limiting relative displacement of the coupling devices towards each other.</claim-text> <claim-text>9. A duct as claimed in any one of the preceding claims, which comprises a twin-walled duct.</claim-text> <claim-text>10. A duct as claimed in claim 9, in which the coupling devices each provide a sealed closure between inner and outer walls of the respective duct component.</claim-text> <claim-text>11. A duct as claimed in any one of the preceding claims, which comprises a chimney.</claim-text> <claim-text>12. A duct comprising first and second duct components which are substantially as described herein with reference to the accompanying drawings.</claim-text> <claim-text>13. A duct component for assembly of a duct as claimed in any one of the preceding claims, the duct component having a male one of the coupling devices at one end and a female one of the coupling devices at the other end.</claim-text>
GB201114809A 2011-08-26 2011-08-26 A duct Withdrawn GB2493983A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB201114809A GB2493983A (en) 2011-08-26 2011-08-26 A duct
JP2011007759U JP3176030U (en) 2011-08-26 2011-12-28 duct
CN 201220026846 CN202708405U (en) 2011-08-26 2012-01-18 Pipeline

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB201114809A GB2493983A (en) 2011-08-26 2011-08-26 A duct

Publications (2)

Publication Number Publication Date
GB201114809D0 GB201114809D0 (en) 2011-10-12
GB2493983A true GB2493983A (en) 2013-02-27

Family

ID=44838799

Family Applications (1)

Application Number Title Priority Date Filing Date
GB201114809A Withdrawn GB2493983A (en) 2011-08-26 2011-08-26 A duct

Country Status (3)

Country Link
JP (1) JP3176030U (en)
CN (1) CN202708405U (en)
GB (1) GB2493983A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5918001B2 (en) * 2012-04-26 2016-05-18 株式会社エム・アイ・ティ Chimney connection device
CN105387476B (en) * 2015-11-02 2018-05-18 安徽元通采暖科技有限公司 Split type chimney
JP6886144B2 (en) * 2017-03-31 2021-06-16 株式会社メトス chimney
JP7112717B2 (en) * 2018-05-29 2022-08-04 株式会社新宮商行 chimney
JP2019207066A (en) * 2018-05-29 2019-12-05 株式会社新宮商行 Chimney
CN111749429B (en) * 2020-07-05 2021-08-17 胡俏俊 Piping shaft convenient to assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20307821U1 (en) * 2003-05-20 2003-08-14 Niesing Anlagenbau Gmbh Chimney flue or process air exhaust pipe has silencer section with identical interface fittings
DE202005020058U1 (en) * 2004-12-23 2006-02-23 Smalbo S.R.L. Metal pipes for fireplaces with natural draft
KR20100011211U (en) * 2009-05-08 2010-11-17 (주)로얄기공 A stack

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20307821U1 (en) * 2003-05-20 2003-08-14 Niesing Anlagenbau Gmbh Chimney flue or process air exhaust pipe has silencer section with identical interface fittings
DE202005020058U1 (en) * 2004-12-23 2006-02-23 Smalbo S.R.L. Metal pipes for fireplaces with natural draft
KR20100011211U (en) * 2009-05-08 2010-11-17 (주)로얄기공 A stack

Also Published As

Publication number Publication date
CN202708405U (en) 2013-01-30
GB201114809D0 (en) 2011-10-12
JP3176030U (en) 2012-06-07

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