NL8700395A - Flat cowl for double-walled chimney - has inner and outer tube, inner one carrying cover plate and top annular plate with skirt towards which outer tube widens - Google Patents

Flat cowl for double-walled chimney - has inner and outer tube, inner one carrying cover plate and top annular plate with skirt towards which outer tube widens Download PDF

Info

Publication number
NL8700395A
NL8700395A NL8700395A NL8700395A NL8700395A NL 8700395 A NL8700395 A NL 8700395A NL 8700395 A NL8700395 A NL 8700395A NL 8700395 A NL8700395 A NL 8700395A NL 8700395 A NL8700395 A NL 8700395A
Authority
NL
Netherlands
Prior art keywords
tube
pipe
chimney
hood
cover plate
Prior art date
Application number
NL8700395A
Other languages
Dutch (nl)
Original Assignee
Cox Geelen Bv
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 Cox Geelen Bv filed Critical Cox Geelen Bv
Priority to NL8700395A priority Critical patent/NL8700395A/en
Priority to NL8700395 priority
Publication of NL8700395A publication Critical patent/NL8700395A/en

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J13/00Fittings for chimneys or flues 
    • F23J13/02Linings; Jackets; Casings
    • F23J13/025Linings; Jackets; Casings composed of concentric elements, e.g. double walled
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L17/00Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
    • F23L17/02Tops for chimneys or ventilating shafts; Terminals for flues
    • F23L17/04Balanced-flue arrangements, i.e. devices which combine air inlet to combustion unit with smoke outlet
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2211/00Flue gas duct systems
    • F23J2211/10Balanced flues (combining air supply and flue gas exhaust)
    • F23J2211/101Balanced flues (combining air supply and flue gas exhaust) with coaxial duct arrangement

Abstract

The flat const is for a double-walled chimney and has inner and outer tube parts corresp. to the inner (5) and outer pipes of thechimney. The inner tube carries a cap comprising a cover plate (9) spaced from the end of the inner tube and an annular plate (7) at the inner tube top. A circular strip (10) is mounted between the cover and annular plate and has a dia. greater than the inner pipe dia. The annular plate has a skirt (17) which extends down around the outer tubes. The outer tube (13) widens towards the top of the chimney forming a narrowed passage between the skirt and inner tube. Below the skirt a second annular plate (19) is attached on the outer tube with a slit (20) between, the skirt having an outwards flange (18) as big as the cover plate or as small as the second annular plate.

Description

\ i *

Hw / Mv / Cox Geelen 8 Chimney hood

The invention relates to a hood for a double-walled chimney, which hood mainly consists of a cylindrical inner pipe part that tapes with the inner pipe of the chimney, an outer pipe-part that tapes with the outer pipe, wherein the inner pipe part carries a cap provided with a remote cover plate located above the inner tube section end, and ring plate arranged around the top end of the inner tube section.

The object of the invention is to improve a hood of the type described in the preamble, such that under all weather conditions and wind directions on the one hand a good draft is maintained through the inner tube part, a good air pressure in the space between the inner and outer tube part of the chimney, avoiding mixing flue gases with the fresh air to be added to the hood itself. Such a requirement package is necessary with today's modern gas or oil fired boilers for heating purposes.

The hood according to the invention is distinguished in that the ring plate is provided with an apron falling downwards over the outer tube part. This appears to effectively overcome the drawback of mixing flue gases and fresh air.

In order to obtain the desired underpressure in the inner tube section and the desired pressure in the space between the inner and outer tube section of the chimney, the invention proposes to allow the outer tube section to widen in the direction of the skirt, to form a narrowed passage between apron and outer pipe section. This measure is also important when the chimney cap flows through wind with an upwardly directed component.

A further improvement to this end is obtained by attaching a second ring plate to the outer pipe section at a distance below the skirt. Preferably, the spatial space is kept between this annular plate and the outer tube part.

It has been found experimentally that the pressure variation in the inner and outer pipe of the chimney can be reduced under various wind conditions by providing the apron with an outwardly pointing flange, the outer dimension of which is at most equal to that of the cover plate and at least equal to that of the second ring plate.

The above and other features of the invention will become apparent from the figure description below of an exemplary embodiment.

The accompanying figure shows a chimney hood according to the invention in standing section, partly in elevation, which hood is placed on a double-walled chimney.

The double-walled chimney consists of an inner pipe 1 and an outer pipe 2 placed at a large distance around it. The construction and mounting of the inner and outer pipe of the chimney falls outside the scope of the invention and can be of any arbitrary shape and design. It is true that the inner pipe 1 is connected to the flue gas discharge duct of the connected gas- or oil-fired appliance, not shown, while the space between inner and outer pipe at the bottom of the chimney is connected to a branch stub 3, which leads to the fresh air inlet of the respective device.

In the drawing, the outer pipe 2 is slightly widened by an extension 21, which is attached to the part 2 by means of nails 4. This serves merely to facilitate the roof passage and further falls outside the scope of the invention.

The chimney cap according to the invention consists of an inner pipe section 5 which is flush with the inner pipe 1, which here is designed as a cylindrical part which falls within a flared flared section of the inner pipe 1.

At the top, the inner tube part 5 is provided with an outwardly directed flange 6, which serves as support for an annular plate 7, which is further explained below. The inner pipe 5 is then extended with an extension 5 ', which exactly matches the part 5.

8 7 0 CU r> s -3-

The ring plate 7 supports a number of spacers 8, in this case three, on which a cover plate 9 is mounted. The spacers 9 also carry an upright annular strip 10 secured above the center of the spacers 85. The bottom edge of the annular strip 10 is at a lower level than the top edge of the extension 5 '. Between the cover plate 9 and the annular strip 10, a spatial space 11 is also kept, which is smaller than the spatial space 12 between the annular strip 10 and the ring-10 plate 7.

The outer pipe part 2 'is provided at the top end with an outer pipe part 13 of the chimney cap according to the invention. This outer tube part 13 is widened upwards, which widening consists of two steps. The first stage 14 is arranged inversely conically on the cylindrical portion around the outer pipe 2 ', the inverse conical portion 14 continuing into a cylindrical portion 15 and then into a flange-shaped end flange 16.

The ring plate 7 is provided with a downwardly hanging apron 17 which is provided at the bottom edge with an outwardly pointing flange 18. The flange 16 is approximately halfway up the height of the downwardly hanging apron 17, so that the bottom edge of the flange 18 is at some distance below flange 16.

Finally, the outer tube part 13 is formed at a distance from the flange 18 with a second ring plate 19, a gap 20 being kept between the ring plate 19 and the outer tube part 13.

It should be noted that the outer circumference of the outwardly pointing flange 18 is at most equal to the outer dimension of the cover plate 9 and at least equal to the outer dimension of the second ring plate 19, which ensures the correct pressure ratios in inner and outer pipe sections of the chimney in connection with wind directions in the upward and downward sense *

The dimensions of the various plates and rings of the chimney hood listens quite accurately, due to the weather conditions and the most common wind direction. λ ί * u ü ü w • ip) '· · -4- gen. It will be clear that when connecting an appliance to the chimney, a negative pressure must be maintained in the inner pipe section 1 by the prevailing wind. This is achieved because the top part of the hood between the ring plate 7 and the cover plate 9 has a suction effect by the respective wind, so that the waste gases according to arrow P1 are always discharged. Even when the boiler is switched off, there will be an underpressure in the inner pipe part, so that standing ventilation through the chimney is always maintained.

If the appliance is equipped with a forced ventilation unit, this fan will generate an underpressure in the space between the inner and outer pipe section 1,2, so that the supply of fresh air via arrow P2 is ensured.

Nevertheless, when such a fan is switched off in the appliance, a desired draft through that space will still be maintained in connection with the underpressure achieved in the inner pipe section 1, but also by applying the narrowed passage determined by the outer dimension of flange 16 and the inner dimension of the apron 17. This venturi-like passage provides an accelerated air movement under the apron 17 into the space between inner pipe part 1 and outer pipe part 2. The second ring plate 19 hereby serves as a kind of shield for an air flow with an upwardly directed airflow. flow component, so that no additional thrust is created under the skirt 17.

The invention is not limited to the above-described embodiment. In particular not with regard to the cylindrical shape of the hood shown. It can also show any other desired cross-section, for example square, in plan view.

The fixing of the various parts to one another can take place in any suitable manner and is not limited to the rivets shown.

!> * v U -3 ci 0

Claims (8)

1. A hood for a double-walled chimney, which hood mainly consists of an inner pipe section which is flush with the inner pipe of the chimney, an outer pipe section which is flush with the outer pipe, wherein the inner pipe part carries a hood provided with a cover plate located at a distance above the inner pipe section. and ring plate arranged around the top end of the inner tube part, characterized in that the ring plate (7) is provided with an apron (17) pointing downwards over the outer tube part (13).
Hood according to claim 1, characterized in that the outer pipe section (13) widens (14, 15, 16) in the direction of the chimney to form a narrowing. the passage between apron (17) and the outer pipe section (13).
3. Hood as claimed in claim 1 or 2, characterized in that a second ring plate (19) is attached to the outer tube part (13) at a distance below the apron (17).
Cap according to claim 3, characterized in that a slit-shaped space (20) is held between the second ring plate (19) and the outer tube part (13).
Hood according to any one of the preceding claims, characterized in that the skirt (17) is provided with an outwardly pointing flange (18), the outer dimension of which is at most equal to that of the cover plate (9) and at least equal to that of the second ring plate (19).
Hood according to any one of the preceding claims, characterized in that a standing strip is arranged between the cover plate (9) and the ring plate (7), the size of which in top view is larger than that of the outer circumference of the inner pipe section (5). .
Cap according to claim 6, characterized in that the bottom edge of the strip (10) is lower than the top edge of the inner tube part (5).
Cap according to claims 6 and 7, characterized in that the distance between the bottom edge of the strip (10) and the ring plate (7) is greater than that from the top edge of the strip (10) to the cover plate (9 ). 8 * 7 ƒ ft 'S ’Λ ff' '! * I *: ï λ.
NL8700395A 1987-02-17 1987-02-17 Flat cowl for double-walled chimney - has inner and outer tube, inner one carrying cover plate and top annular plate with skirt towards which outer tube widens NL8700395A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL8700395A NL8700395A (en) 1987-02-17 1987-02-17 Flat cowl for double-walled chimney - has inner and outer tube, inner one carrying cover plate and top annular plate with skirt towards which outer tube widens
NL8700395 1987-02-17

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL8700395A NL8700395A (en) 1987-02-17 1987-02-17 Flat cowl for double-walled chimney - has inner and outer tube, inner one carrying cover plate and top annular plate with skirt towards which outer tube widens

Publications (1)

Publication Number Publication Date
NL8700395A true NL8700395A (en) 1988-09-16

Family

ID=19849591

Family Applications (1)

Application Number Title Priority Date Filing Date
NL8700395A NL8700395A (en) 1987-02-17 1987-02-17 Flat cowl for double-walled chimney - has inner and outer tube, inner one carrying cover plate and top annular plate with skirt towards which outer tube widens

Country Status (1)

Country Link
NL (1) NL8700395A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9000096A (en) * 1990-01-15 1991-08-01 Burgerhout Bv Gas-fired central heating appliance - has combustion gas discharge duct with sliding tubes unit
EP0491444A1 (en) * 1990-12-17 1992-06-24 Burgerhout B.V. Combined burner air supply and combustion gas exhaust
NL1001077C2 (en) * 1995-08-28 1997-03-03 Muelink & Grol Bv Fluid-carrying channel element provided with resistance members as well as sleeve part provided with resistance members for application to such a channel element.
GB2528982A (en) * 2014-08-08 2016-02-10 Ventive Ltd A cowl for a ventilation system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9000096A (en) * 1990-01-15 1991-08-01 Burgerhout Bv Gas-fired central heating appliance - has combustion gas discharge duct with sliding tubes unit
EP0491444A1 (en) * 1990-12-17 1992-06-24 Burgerhout B.V. Combined burner air supply and combustion gas exhaust
NL1001077C2 (en) * 1995-08-28 1997-03-03 Muelink & Grol Bv Fluid-carrying channel element provided with resistance members as well as sleeve part provided with resistance members for application to such a channel element.
EP0762054A1 (en) * 1995-08-28 1997-03-12 MUELINK & GROL B.V. Pressure ring for roof duct
GB2528982A (en) * 2014-08-08 2016-02-10 Ventive Ltd A cowl for a ventilation system
GB2528982B (en) * 2014-08-08 2020-09-02 Ventive Ltd A cowl for a ventilation system

Similar Documents

Publication Publication Date Title
DE3928621C2 (en) Bottom source outlet
US5435780A (en) Ventilated skylight
US2547448A (en) Hot-air space heater
CA1298132C (en) Space ventilation and chimney drafting device
US20130045669A1 (en) Omnidirectional vent cap
AU694324B2 (en) Power-vented, direct-vent water heater
US20040142652A1 (en) Liner adaptor for chimneys
FI66979B (en) Foergasningsoljebraennare
NL8304041A (en) Boiler with vertical burner tube.
CN102388269A (en) Cooktop swirl burner
US20040200440A1 (en) Explosion-proof hot water heater with unsealed fuel combustion chamber
US5881709A (en) Alcohol fuel burner
US2916983A (en) All purpose flue
DE3200395C2 (en)
US4118173A (en) Unidirectional seal for flow passages
KR100481068B1 (en) Suction and exhaust device
US3045579A (en) Vertical discharge roof exhauster
US7458888B2 (en) Chimney termination cap
US5749719A (en) Velocity sealed flare tip
JPH10288371A (en) Evacuation device
US4123093A (en) Ductboard collar
US3361051A (en) Vent cap assembly
US6468072B2 (en) Wind guard for open flame gas lantern
US8408196B2 (en) Ceiling support box with outside air inlet
EP1052461A3 (en) Water heater

Legal Events

Date Code Title Description
BV The patent application has lapsed