CA2459368A1 - Venturi barometric draft regulator - Google Patents
Venturi barometric draft regulator Download PDFInfo
- Publication number
- CA2459368A1 CA2459368A1 CA002459368A CA2459368A CA2459368A1 CA 2459368 A1 CA2459368 A1 CA 2459368A1 CA 002459368 A CA002459368 A CA 002459368A CA 2459368 A CA2459368 A CA 2459368A CA 2459368 A1 CA2459368 A1 CA 2459368A1
- Authority
- CA
- Canada
- Prior art keywords
- flue
- venturi
- draft
- side connector
- longitudinal
- 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.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING 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
- F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
- F23L17/02—Tops for chimneys or ventilating shafts; Terminals for flues
- F23L17/06—Tops for chimneys or ventilating shafts; Terminals for flues branched; T-headed
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
Abstract
There is provided a tee fitting having two longitudinal connectors and a single side connector, the longitudinal connectors adapted to be connected to a furnace and a flue stack and the side connector adapted to be connected to a draft regulator, wherein a venturi is formed along an interior of the longitudinal side directly behind the side connector. The tee fitting uses the venturi principal to create a negative pressure directly behind the door of a standard barometric damper when the burner is in operation and the flue gases are flowing to the flue resulting in less bleed air injected into the flue gas stream, higher temperature gas delivered to the base of the flue, and maintainance of proper over the fire pressure. More heat may be extracted by a heat exchanger, increasing the steady state efficiency, while still protecting the flue from condensation. When the appliance is off, the venturi provides a further advantage, in that the draft door remains closed at higher natural flue draft and less room air escapes up the flue, reducing the annual fuel usage.
Description
VENTURI BAROMETRIC DRAFT REGULATOR
FIELD OF THE INVENTION
The present invention relates generally to the field of draft regulators.
Specifically, the present invention provides an improved tee fitting containing a venturi ramp used to control the pressure over the fire of a fuel burning appliance.
BACKGROUND OF THE INVENTION
In order to burn fuel efficiently, air or oxygen must be mixed with the fuel in a proper ratio. Since a furnace breach is attached to a flue, which creates a draft of varying flow rates, a barometric draft regulator is normally used in the breach to control this flow.
Commonly used barometric draft regulators, such as that described in Canadian Patent No. 988,799, require excess bleed air to maintain proper over the fire pressure during operation of a fuel burning appliance, limiting the maximum steady state efi:lciency of the appliance.
During an off cycle of the appliance this barometric draft regulator allows bleed air from the heated space into the flue when the natural flue draft reaches the overthe fire pressure setting, increasing annual fuel usage.
Additionally, there is a need to increase the steady state efficiency of a fuel-burning appliance above the 86.5% limit as dictated by CSA regulations.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an apparatus to control the over the fire pressure or draft in a more efficient manner, reducing the volume of bleed air wasted through the flue of a fired furnace and increasing the steady state efficiency of the furnace by delivering higher temperatures to the base of the flue.
It has been found that the introduction of a venturi to the tee to which the barometric draft regulator is connected allows the minimum CSA allowable limit of 300°F to be maintained while increasing the steady state efficiency of the appliance above 86.5%.
According to the present invention, there is provided a tee fitting having two longitudinal connectors separated by a longitudinal side portion and a single side connector, the longitudinal connectors adapted to be connected to a furnace and a flue stack, respectively, and the side connector adapted to be connected to a draft regulator, wherein a venturi is formed along an interior of the longitudinal side portion directly opposite the side connector.
This device uses the venturi principal to create a negative pressure directly behind the door of a standard barometric damper when the burner is in operation and the flue gases are flowing to the flue. Because of the venturi, there is less bleed air injected into the flue gas stream, therefore, a higher temperature gas is delivered to the base of the flue while maintaining the proper over the fire pressure. More heat may be extracted by the heat exchanger, increasing the steady state efficiency, while still protecting the flue from condensation. When the appliance is off, the venturi provides further advantage, in that the draft door remains closed at higher natural flue draft and less room air escapes up the flue, reducing the annual fuel usage.
FIELD OF THE INVENTION
The present invention relates generally to the field of draft regulators.
Specifically, the present invention provides an improved tee fitting containing a venturi ramp used to control the pressure over the fire of a fuel burning appliance.
BACKGROUND OF THE INVENTION
In order to burn fuel efficiently, air or oxygen must be mixed with the fuel in a proper ratio. Since a furnace breach is attached to a flue, which creates a draft of varying flow rates, a barometric draft regulator is normally used in the breach to control this flow.
Commonly used barometric draft regulators, such as that described in Canadian Patent No. 988,799, require excess bleed air to maintain proper over the fire pressure during operation of a fuel burning appliance, limiting the maximum steady state efi:lciency of the appliance.
During an off cycle of the appliance this barometric draft regulator allows bleed air from the heated space into the flue when the natural flue draft reaches the overthe fire pressure setting, increasing annual fuel usage.
Additionally, there is a need to increase the steady state efficiency of a fuel-burning appliance above the 86.5% limit as dictated by CSA regulations.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an apparatus to control the over the fire pressure or draft in a more efficient manner, reducing the volume of bleed air wasted through the flue of a fired furnace and increasing the steady state efficiency of the furnace by delivering higher temperatures to the base of the flue.
It has been found that the introduction of a venturi to the tee to which the barometric draft regulator is connected allows the minimum CSA allowable limit of 300°F to be maintained while increasing the steady state efficiency of the appliance above 86.5%.
According to the present invention, there is provided a tee fitting having two longitudinal connectors separated by a longitudinal side portion and a single side connector, the longitudinal connectors adapted to be connected to a furnace and a flue stack, respectively, and the side connector adapted to be connected to a draft regulator, wherein a venturi is formed along an interior of the longitudinal side portion directly opposite the side connector.
This device uses the venturi principal to create a negative pressure directly behind the door of a standard barometric damper when the burner is in operation and the flue gases are flowing to the flue. Because of the venturi, there is less bleed air injected into the flue gas stream, therefore, a higher temperature gas is delivered to the base of the flue while maintaining the proper over the fire pressure. More heat may be extracted by the heat exchanger, increasing the steady state efficiency, while still protecting the flue from condensation. When the appliance is off, the venturi provides further advantage, in that the draft door remains closed at higher natural flue draft and less room air escapes up the flue, reducing the annual fuel usage.
-2-The draft regulator door may be set to open with greater force than normal.
When the furnace is not running, the regulator door tends to open less thus reducing waste heat escaping through the flue.
During furnace operation, flue gases flowing past the venturi create greater negative pressures allowing a heavier weight to be used on the regulator door to maintain the required over the fire pressure.
The overall benefit is a reduction in annual oil consumption, generally of the order of 10% to 15%.
The above and other objects and the attendant advantages of the present invention will become readily apparent by reference to the following detailed description when considered in conjunction with the accompanying drawings, wherein:
FIG. 1 is a side perspective view of the apparatus of the present invention;
FIG. 2 is a left end view of the apparatus of the present invention;
FIG. 3 is a cross-sectional side view of the apparatus of the present invention; and FIG. 4 is a bottom view of the apparatus of the present invention.
FIG. 1 provides a side view of a tee fitting according to the present invention having a first longitudinal connector 1, and a second longitudinal connector2 separated by a longitudinal side portion 5, and a side connector 3.
FIG. 2 provides a side view of the tee fitting of FIG. 1 through the first longitudinal connector 1 revealing a venturi ramp 4.
When the furnace is not running, the regulator door tends to open less thus reducing waste heat escaping through the flue.
During furnace operation, flue gases flowing past the venturi create greater negative pressures allowing a heavier weight to be used on the regulator door to maintain the required over the fire pressure.
The overall benefit is a reduction in annual oil consumption, generally of the order of 10% to 15%.
The above and other objects and the attendant advantages of the present invention will become readily apparent by reference to the following detailed description when considered in conjunction with the accompanying drawings, wherein:
FIG. 1 is a side perspective view of the apparatus of the present invention;
FIG. 2 is a left end view of the apparatus of the present invention;
FIG. 3 is a cross-sectional side view of the apparatus of the present invention; and FIG. 4 is a bottom view of the apparatus of the present invention.
FIG. 1 provides a side view of a tee fitting according to the present invention having a first longitudinal connector 1, and a second longitudinal connector2 separated by a longitudinal side portion 5, and a side connector 3.
FIG. 2 provides a side view of the tee fitting of FIG. 1 through the first longitudinal connector 1 revealing a venturi ramp 4.
-3-FIG. 3 provides a cross-sectional side view of the tee fitting of FIG 1. As seen, the venturi ramp 4 is formed along the longitudinal side portion 5 between the first longitudinal connector 1 and the second longitudinal connector 2. The ramp would be located directly behind the commonly used barometric door connected to the side connector 3.
It is noted that the system function is dependent on the venturi principal and not on the mechanical shape of the venturi itself. To ensure acceptable operation of the invention the venturi must be constructed to produce a minimum negative 0.02" of water when the appliance is operating at its steady state efficiency. The size of the tee in which the venturi is located would be constructed to match the size of the breaching of the appliance. In order to achieve the required minimum negative 0.02" of water, the height of the venturi ramp is advantageously from about 80 to 90% of the diameter of the connectors 1 and 2. In a preferred embodiment utilizing a 5" tee, the height of the venturi ramp is approximately 85% of the diameter of the connectors 1 and 2, that is approximately4.25", achieving the minimum negative 0.02" ofwater.
It should be understood that the specific form of the invention hereinabove described is intended to be representative only, as certain modifications within the scope of these teachings will be apparent to those skilled in the art.
It is noted that the system function is dependent on the venturi principal and not on the mechanical shape of the venturi itself. To ensure acceptable operation of the invention the venturi must be constructed to produce a minimum negative 0.02" of water when the appliance is operating at its steady state efficiency. The size of the tee in which the venturi is located would be constructed to match the size of the breaching of the appliance. In order to achieve the required minimum negative 0.02" of water, the height of the venturi ramp is advantageously from about 80 to 90% of the diameter of the connectors 1 and 2. In a preferred embodiment utilizing a 5" tee, the height of the venturi ramp is approximately 85% of the diameter of the connectors 1 and 2, that is approximately4.25", achieving the minimum negative 0.02" ofwater.
It should be understood that the specific form of the invention hereinabove described is intended to be representative only, as certain modifications within the scope of these teachings will be apparent to those skilled in the art.
-4-
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002459368A CA2459368A1 (en) | 2004-03-01 | 2004-03-01 | Venturi barometric draft regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002459368A CA2459368A1 (en) | 2004-03-01 | 2004-03-01 | Venturi barometric draft regulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2459368A1 true CA2459368A1 (en) | 2005-09-01 |
Family
ID=34865975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002459368A Abandoned CA2459368A1 (en) | 2004-03-01 | 2004-03-01 | Venturi barometric draft regulator |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2459368A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105222142A (en) * | 2015-10-22 | 2016-01-06 | 山东多乐采暖设备有限责任公司 | The dual-purpose threeway of a heatable brick bed is led in heating |
| US20170370610A1 (en) * | 2016-06-27 | 2017-12-28 | Ronald C. Parry | Exhaust ventilator |
-
2004
- 2004-03-01 CA CA002459368A patent/CA2459368A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105222142A (en) * | 2015-10-22 | 2016-01-06 | 山东多乐采暖设备有限责任公司 | The dual-purpose threeway of a heatable brick bed is led in heating |
| US20170370610A1 (en) * | 2016-06-27 | 2017-12-28 | Ronald C. Parry | Exhaust ventilator |
| US10690375B2 (en) * | 2016-06-27 | 2020-06-23 | Ronald C Parry | Exhaust ventilator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8454352B2 (en) | Micro-pilot for gas appliance | |
| CA2455372A1 (en) | Water heater | |
| CA2638097A1 (en) | Flare stack adapted to heat incoming fuel | |
| WO2010036842A3 (en) | Combustion system with steam or water injection | |
| WO2011073553A3 (en) | Heat exchanger for a hot fuel cell | |
| US20040265758A1 (en) | Method and device to improve the ratio of oxygen mass versus fuel mass during ignition in combustion mechanisms operating with fluid hydrocarbon fuels | |
| US20090142720A1 (en) | Water Heater and a Method of Operating Same | |
| CN202955780U (en) | Self-adaptation type multiple gas source gas control system and heating device | |
| BG104229A (en) | Torch | |
| TW200504316A (en) | Safety apparatus for portable gas range and method for operating the same | |
| US9810455B2 (en) | Heat and energy recovery and regeneration assembly, system and method | |
| CA2459368A1 (en) | Venturi barometric draft regulator | |
| CN204176914U (en) | Full premixed condensed gas water heater | |
| CN201028615Y (en) | Backfire type multipurpose coal-fired boiler | |
| CA2384999A1 (en) | Heat regulating unit | |
| CN210088834U (en) | Boiler multistage combustion efficient heating device | |
| KR20120012729A (en) | The pellet stove which combines a hot blast function and a humidification function. | |
| RU2104396C1 (en) | Device for protection of air-supply hole of mine from freezing-around | |
| CN210267694U (en) | High-efficient gas heater | |
| CN205299459U (en) | Steam generator's negative combustion system | |
| CN2924347Y (en) | Gas control valve for gas appliance | |
| CN101598335A (en) | Controllable air film bilateral strong preheat pulverized coal combustion device | |
| CN2669084Y (en) | Natural gas wellhead heating stove | |
| CN201368454Y (en) | Device with controllable air film capable of strongly pre-heating and burning coal dust at two sides | |
| CN209180998U (en) | Heating stove second-time burning air feed system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |