US3650262A - Forced draft furnace safety system - Google Patents

Forced draft furnace safety system Download PDF

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Publication number
US3650262A
US3650262A US49886A US3650262DA US3650262A US 3650262 A US3650262 A US 3650262A US 49886 A US49886 A US 49886A US 3650262D A US3650262D A US 3650262DA US 3650262 A US3650262 A US 3650262A
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Prior art keywords
blower
furnace
air
tube
flow
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US49886A
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Warren W Root
William W Frank
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York International Corp
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Borg Warner Corp
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Assigned to YORK INTERNATIONAL CORPORATION, 631 SOUTH RICHLAND AVENUE, YORK, PA 17403, A CORP. OF DE reassignment YORK INTERNATIONAL CORPORATION, 631 SOUTH RICHLAND AVENUE, YORK, PA 17403, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BORG-WARNER CORPORATION
Anticipated expiration legal-status Critical
Assigned to CANADIAN IMPERIAL BANK OF COMMERCE reassignment CANADIAN IMPERIAL BANK OF COMMERCE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YORK INTERNATIONAL CORPORATION
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL
    • F24H9/00Details
    • F24H9/20Arrangement or mounting of control or safety devices or methods
    • F24H9/2064Arrangement or mounting of control or safety devices or methods for air heaters
    • F24H9/2085Arrangement or mounting of control or safety devices or methods for air heaters for heaters using fluid combustibles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N1/00Regulating fuel supply
    • F23N1/06Regulating fuel supply conjointly with draught
    • F23N1/065Regulating fuel supply conjointly with draught using electrical or electromechanical means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL
    • F24H3/00Air heaters having heat generating means
    • F24H3/02Air heaters having heat generating means with forced circulation
    • F24H3/04Air heaters having heat generating means with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0488Air heaters having heat generating means with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using fluid combustibles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00Measuring
    • F23N2225/02Measuring filling height in burners
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00Ventilators
    • F23N2233/02Ventilators in stacks
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]

Abstract

A safety system for sensing the air flow through a forced draft furnace and using that sensed flow to operate a switch which prevents gas fuel from being supplied to the furnace in the absence of such flow is disclosed in which a vacuum sensing tube is positioned at the edge of the inlet to a centrifugal blower within a specific range of angular positions to obtain a sufficiently large magnitude of pressure differential to operate the switch.

Description

[ 1 Mar. 21, 1972 Suffron et al. ABSTRACT A safety system for sensing the air flow through a forced draft 5 Claims, 2 Drawing Figures .KBO
. IIIIIV 1,713,442 5/1929 Matcovich........;................. 3,277,947 10/1966 Gacioch....... 3,403,962 10/1968 Primary ExaminerCharles .l. Myhre Attorney-Donald W. Banner, William S. McCurry and John W. Butcher furnace and using that sensed flow to operate a switch which prevents gas fuel from being supplied to the furnace in the absence of such flow is disclosed in which a vacuum sensing tube is positioned at the edge of the inlet to a centrifugal blower within a specific range of angular positions to obtain a sufficiently large magnitude of pressure difi'erential to operate the switch.
Safety Switch .126/110 R, 431/20 .F23n l/06, F24h 3/02 126/110, 110 B, 116, 116 B; 431/20; 236/45 SYSTEM [72] Inventors: Warren W. Root; William W. Frank, both of York, Pa.
Borg-Warner Corporation, Chicago, 111.
June 25, 1970 [211 App]. No.: 49,886
References Cited UNITED STATES PATENTS United States Patent Root et al.
[54] FORCED DRAFT FURNACE SAFETY I [73] Assignee:
[22] Filed:
[52] U.S.Cl.
[58] FieldofSearch...................
Gas Source PATENTEUIARZHQH U 3,650,262
Safety Switch Gas I2 Source FIGQ Inventors Warren W. Roor 36 William W. Frank Horney 1 FORCED DRAFT FURNACE SAFETY SYSTEM FIELD OF THE INVENTION BACKGROUNDOF THE INVENTION In forced draft furnace systems it is desirable beforeignition and burning of the fuel to sample the flow of air and to determine if a sufficient flow is present for safety. In the past this has been done indirectly, as by a centrifugal switch on the blower drive motor. This may lead to dangerously inaccurate samplings, as it is possible for the motor to rotate sufficiently to activate the switch while the blower is not operated. For example this may occur if a drive pulley belt or other drive connection is broken. To directly sample the air flow in the system and to operate a switch thereby presents certain problems, as the optimum air flow produces a relatively low pressure difference. Thus, either an extremely sensitive (and consequently expensive) sensor must be employed or the direct sensor must needlessly prevent ignition until an unnecessarily large draft is present. 1
The present invention has as its primary object the provision of a safety system in which the draft vacuum may be sensed directly in a manner to achieve sufficient pressure difference to positively, efficiently and economically prevent burning of the fuel in the absence of a sufficient draft.
In overcoming the above problems in centrifugal blower systems the present invention provides a switch that directly samples pressure differential in the system.
SUMMARY OF THE INVENTION A safety system constructed in accordance with the present invention comprises a pressure sensitive unit, preferably a vacuum tube or the like positioned at the inlet from the furnace chamber to the centrifugal blower for operating a pressure sensitive switch. V
For best results, the present inventors have discovered, the sensor should be located between the 45 and the 95 (and preferably at approximately the 70) radius from the center of the inlet as measured in the direction of rotation from the radius parallel to the direction of outlet air flow.
BRIEF DESCRIPTION OF THE DRAWINGS The features of the present invention which are believed to be novel are set forth with particularity in the appended claims. The invention, together with the further advantages thereof, may best be understood by reference to the following description taken in connection with the accompanying drawings, in the two figures of which like reference numerals identify like elements, and in which:
FIG. 1 is an elevational view, partly in section and partly in schematic, of a forced draft gas furnace and exhaust system including a safety system embodying the principles of the present invention; and
FIG. 2 is a sectional view of a portion of the system of FIG. 1 as seen from the line 2-2 in that figure.
DETAILED DESCRIPTION Referring to FIG. 1 there is depicted a furnace system, generally designated by the numeral 10, of the gas-fired forced draft type which incorporates a safety system constructed in accordance with the present invention.
The furnace system 10 is fired by natural or bottled gas from a suitable source 12 through a controlled safety valve 14. From the valve 14 the gas is fed to burner units 16 where it, during operation, is burned. The hot combustion gases rise upward through a heat exchanger 18 to a collection chamber 20 from which they are drawn through an opening 22.
The opening 22 leads to a second flue gas collection box 24 from which they are drawn by a centrifugal blower unit 26. The blower unit 26 includes a circular opening inlet 28 having, as shown, a bell mouth inlet from the chamber 24. Although here depicted as a bell mouth inlet the present invention may equally well be employed with a sharp edge inlet. From the inlet 28 the flue gases are impelled by-a blower wheel 30 which is driven by an externally mounted electric motor 32. The flue gases are normally vented to the atmosphere from the blower exit port 34.
As so far described the system 10 is conventional and wellknown and has therefore been described and depicted in general terms for brevity and clarity.
In accordance with the present invention, then, an air pressure sampling means including a tube 34 is provided in the chamber 24. The tube 34 is formed in a right angle bend and has an open end 34E terminating at the opening 28 adjacent to but spaced clear from the blower wheel 30. The precise positioning of the tube 34 is best shown in FIG. 2 wherein it can be seen that it opens at the interior of the edge of the circular opening 28 at a position on a radius 36 from the center of the opening 28 that is located at an angle designated a in FIG. 2. The angle a is measured from a radius indicated by a line 38 which is parallel to the gaseous flow (indicated by the arrow 40) from the blower exit port 34. The angle a is preferably about although it has been discovered by the present inventors that superior results will be obtained for the range of 0: ap-
proximately equal to 45 to at approximately equal to The open end or port 34E in the tube 34 is located at the edge of and flush with the blower inlet opening 28 and parallel to the rotating vanes of the blower wheel 30. As noted above, the maximum effect is sensed through a range of approximately 50.
The vacuum sensed by the tube 34 in the preferred 70 position is up to five times the magnitude of the vacuum that would be sensed by a tube simply opening into the box 24. As such, it is sufficient to activate a pressure differential switch such as the switch 36, FIG. 1, connected to tube 34 and servingv to govern the valve 14, as indicated by the line 38, to prevent flow of gas to the burner 10 in the absence of a sensed vacuum. The pressure sensitive switch 36 employs the tube sampled pressure and the ambient air pressure. However, if a further pressure differential is desired, the pressure at the output of the blower may be substituted for the ambient pressure.
The above described safety system has been tested with satisfactory and high quality results in a modified outdoor furnace unit of the type manufactured by the York Division of Borg-Warner Corporation, the assignee of the present invention, and designated by the type number series SA 246080 and SA 610160, which are currently available in commerce. The pressure switch unit 36 employed in these tests was the commercially available Air Pressure Differential Switch designated .ll-l-l00-. 19-05 which is manufactured by the Columbus Electrical Manufacturing Company.
It should now be clear that a new and improved forced draft furnace safety system has been described that is economical and effective in preventing the flow of flammable gas to the furnace burners in the absence of an actual draft. The above described system is safer than the previously employed centrifugal blower motor switch in that it measures directly the presence of a forced draft and prevents false actuation of the gas control valve such as may be occasioned by a broken drive between the motor and the blower.
While particular embodiments of the invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the invention in its broader aspects, and, therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention.
What is claimed is:
1. The improvement in a forced draft furnace safety system for use with a furnace having a centrifugal blower for moving air and combustion gases through the furnace, comprising: air pressure sampling means including a tube connected so as to sense the air pressure at the input to the centrifugal blower, and means for controlling the flow of fuel to the furnace in response thereto so as to prevent such flow when there is insufficient draft and to allow such flow when there is sufiicient draft.
2. The improvement as defined in claim 1 wherein: said tube has pressure sensing in its opening positioned at the lip of the opening into the blower on a radius from the center of that opening which makes an angle to the radius parallel to the direction of air flow from the blower as measured therefrom in the direction of rotation of the blower wheel, of about 45 to about 95. 3. The improvement as defined in claim 2 wherein said angle is equal to approximately 70.
4. A furnace comprising: a source of flammable gas, (12) a burner, (16) a control valve (14) for connecting or not connecting said source and said burner; a heat exchanger (18) mounted adjacent to said burner with passages for air and flue gases to pass therethrough; a gas collection box (20) connected to said heat exchanger for receiving the air and flue gases;
a centrifugal blower (26) having a generally circular inlet coupled to said gas collection box for receiving air and flue gases therefrom, a rotary mounted blower wheel and an exit port for discharging propelled air and flue gases from the blower in a direction generally tangential to the blower wheel;
an air pressure transmitting tube (34) having an inlet mounted so that the inlet is positioned adjacent to the blower generally circular inlet,
an air pressure differential switch (36) coupled to said tube 1 and to the ambient air pressure for activation in response thereto, and coupled to said control valve for controlling said valve so as to not connect said gas source to said burner in the absence of a sufficient difference in pressure between said tube and ambient air pressure.
5. The furnace as defined in claim 4 wherein:
said tube is positioned so as to sample the drop in air pressure at said inlet at a point adjacent to and interior of the rim of said blower opening, along a radius from the center thereof which radius is at about 70 from, in the direction of travel of the blower wheel, the tangential direction of air flow from the exit port of said blower.
UNTTED STATES PATENT OFFICE CERTIFICATE 0F CORRECTION Patent No. 3 ,650J262 klamh 2l l9l2 Inventor(s) Warren W. Root. et a1 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
Column 2, line 27, change "about to read about 70 Signed and sealed this 31st day of October 1972.
(SEAL) Attest:
EDWARD M.FLETCHER,JR. ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents FORM PO-1050 (10-69) USCOMM-DC 60376-P69 v U.S. GOVERNMENT PRINTING OFFICE: 1959 0-366-334.

Claims (5)

1. The improvement in a forced draft furnace safety system for use with a furnace having a centrifugal blower for moving air and combustion gases through the furnace, comprising: air pressure sampling means including a tube connected so as to sense the air pressure at the input to the centrifugal blower, and means for controlling the flow of fuel to the furnace in response thereto so as to prevent such flow when there is insufficient draft and to allow such flow when there is sufficient draft.
2. The improvement as defined in claim 1 wherein: said tube has pressure sensing in its opening positioned at the lip of the opening into the blower on a radius from the center of that opening which makes an angle to the radius parallel to the direction of air flow from the blower as measured therefrom in the direction of rotation of the blower wheel, of about 45* to about 95*.
3. The improvement as defined in claim 2 wherein said angle is equal to approximately 70*.
4. A furnace comprising: a source of flammable gas, (12) a burner, (16) a control valve (14) for connecting or not connecting said source and said burner; a heat exchanger (18) mounted adjacent to said burner with passages for air and flue gases to pass therethrough; a gas collection box (20) connected to said heat exchanger for receiving the air and flue gases; a centrifugal blower (26) having a generally circular inlet coupled to said gas collection box for receiving air and flue gases therefrom, a rotary mounted blower wheel and an exit port for discharging propelled air and flue gases from the blower in a direction generally tangential to the blower wheel; an air pressure transmitting tube (34) having an inlet mounted so that the inlet is positioned adjacent to the blower generally circular inlet, an air pressure differential switch (36) coupled to said tube and to the ambient air pressure for activation in response thereto, and coupled to said control valve for controlling said valve so as to not connect said gas source to said burner in the absence of a sufficient difference in pressure between said tube and ambient air pressure.
5. The furnace as defined in claim 4 wherein: said tube is positioned so as to sample the drop in air pressure at said inlet at a point adjacent to and interior of the rim of said blower opening, along a radius from the center thereof which radius is at about 70* from, in the direction of travel of the blower wheel, the tangential direction of air flow from the exit port of said blower.
US49886A 1970-06-25 1970-06-25 Forced draft furnace safety system Expired - Lifetime US3650262A (en)

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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3799142A (en) * 1972-04-26 1974-03-26 F Jensen Method and apparatus for sequestering open flame combustion gas
US3963414A (en) * 1973-03-09 1976-06-15 Jensen Fred H Apparatus for sequestering combustion gas of an open burner
US4106474A (en) * 1977-03-17 1978-08-15 Modine Manufacturing Company Heat conserving space heater
US4261326A (en) * 1980-06-02 1981-04-14 Smith Jones, Inc. High-efficiency recuperative furnace
US4299555A (en) * 1979-04-30 1981-11-10 New Super Laundry Machine Co. Control circuit for combustion systems
US4352349A (en) * 1979-11-14 1982-10-05 Yoho Robert W Control circuit for air conditioning systems
US4373897A (en) * 1980-09-15 1983-02-15 Honeywell Inc. Open draft hood furnace control using induced draft blower and exhaust stack flow rate sensing
US4460329A (en) * 1980-01-23 1984-07-17 Heil-Quaker Corporation Power vent and control for furnace
US4483672A (en) * 1983-01-19 1984-11-20 Essex Group, Inc. Gas burner control system
US4752210A (en) * 1982-01-11 1988-06-21 Heil Quaker Corporation Power vent and control for furnace
US4766877A (en) * 1987-09-30 1988-08-30 Thermal Systems, Inc. Catalytic space heater
US4842510A (en) * 1987-09-10 1989-06-27 Hamilton Standard Controls, Inc. Integrated furnace control having ignition and pressure switch diagnostics
US5040943A (en) * 1990-05-17 1991-08-20 Ametek-Lamb Electric Furnace blower housing and mounting bracket
US5086754A (en) * 1982-09-30 1992-02-11 Rajendra K. Narang Fuel burning furnace
US6390806B1 (en) * 2001-09-28 2002-05-21 Carrier Corporation Pneumatic system for flame rollout and draft safeguard protection
US20040043345A1 (en) * 2002-08-30 2004-03-04 Jaeschke Horst Eric Apparatus and methods for variable furnace control
US20100112500A1 (en) * 2008-11-03 2010-05-06 Maiello Dennis R Apparatus and method for a modulating burner controller
US8545214B2 (en) 2008-05-27 2013-10-01 Honeywell International Inc. Combustion blower control for modulating furnace
US20140000235A1 (en) * 2009-07-01 2014-01-02 Deka Products Limited Partnership Stirling cycle machine
US8764435B2 (en) 2008-07-10 2014-07-01 Honeywell International Inc. Burner firing rate determination for modulating furnace
US8876524B2 (en) 2012-03-02 2014-11-04 Honeywell International Inc. Furnace with modulating firing rate adaptation
US9797341B2 (en) 2009-07-01 2017-10-24 New Power Concepts Llc Linear cross-head bearing for stirling engine
US9797340B2 (en) 2007-04-23 2017-10-24 New Power Concepts Llc Stirling cycle machine
US9822730B2 (en) 2009-07-01 2017-11-21 New Power Concepts, Llc Floating rod seal for a stirling cycle machine
US9823024B2 (en) 2009-07-01 2017-11-21 New Power Concepts Llc Stirling cycle machine
US9828940B2 (en) 2009-07-01 2017-11-28 New Power Concepts Llc Stirling cycle machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1713442A (en) * 1927-02-15 1929-05-14 American Can Co Safety device for heating chambers
US2956132A (en) * 1956-08-06 1960-10-11 Baso Inc Control apparatus and control devices for use therein
US3277947A (en) * 1965-02-25 1966-10-11 Carrier Corp Heating apparatus control
US3403962A (en) * 1967-02-28 1968-10-01 American Metal Prod Power venter for gas fired appliances

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1713442A (en) * 1927-02-15 1929-05-14 American Can Co Safety device for heating chambers
US2956132A (en) * 1956-08-06 1960-10-11 Baso Inc Control apparatus and control devices for use therein
US3277947A (en) * 1965-02-25 1966-10-11 Carrier Corp Heating apparatus control
US3403962A (en) * 1967-02-28 1968-10-01 American Metal Prod Power venter for gas fired appliances

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3799142A (en) * 1972-04-26 1974-03-26 F Jensen Method and apparatus for sequestering open flame combustion gas
US3963414A (en) * 1973-03-09 1976-06-15 Jensen Fred H Apparatus for sequestering combustion gas of an open burner
US4106474A (en) * 1977-03-17 1978-08-15 Modine Manufacturing Company Heat conserving space heater
US4299555A (en) * 1979-04-30 1981-11-10 New Super Laundry Machine Co. Control circuit for combustion systems
US4352349A (en) * 1979-11-14 1982-10-05 Yoho Robert W Control circuit for air conditioning systems
US4460329A (en) * 1980-01-23 1984-07-17 Heil-Quaker Corporation Power vent and control for furnace
US4261326A (en) * 1980-06-02 1981-04-14 Smith Jones, Inc. High-efficiency recuperative furnace
US4373897A (en) * 1980-09-15 1983-02-15 Honeywell Inc. Open draft hood furnace control using induced draft blower and exhaust stack flow rate sensing
US4752210A (en) * 1982-01-11 1988-06-21 Heil Quaker Corporation Power vent and control for furnace
US5086754A (en) * 1982-09-30 1992-02-11 Rajendra K. Narang Fuel burning furnace
US4483672A (en) * 1983-01-19 1984-11-20 Essex Group, Inc. Gas burner control system
US4842510A (en) * 1987-09-10 1989-06-27 Hamilton Standard Controls, Inc. Integrated furnace control having ignition and pressure switch diagnostics
US4766877A (en) * 1987-09-30 1988-08-30 Thermal Systems, Inc. Catalytic space heater
US5040943A (en) * 1990-05-17 1991-08-20 Ametek-Lamb Electric Furnace blower housing and mounting bracket
US6390806B1 (en) * 2001-09-28 2002-05-21 Carrier Corporation Pneumatic system for flame rollout and draft safeguard protection
US7101172B2 (en) * 2002-08-30 2006-09-05 Emerson Electric Co. Apparatus and methods for variable furnace control
US20040043345A1 (en) * 2002-08-30 2004-03-04 Jaeschke Horst Eric Apparatus and methods for variable furnace control
US9797340B2 (en) 2007-04-23 2017-10-24 New Power Concepts Llc Stirling cycle machine
US10094593B2 (en) 2008-05-27 2018-10-09 Honeywell International Inc. Combustion blower control for modulating furnace
US8545214B2 (en) 2008-05-27 2013-10-01 Honeywell International Inc. Combustion blower control for modulating furnace
US8764435B2 (en) 2008-07-10 2014-07-01 Honeywell International Inc. Burner firing rate determination for modulating furnace
US20100112500A1 (en) * 2008-11-03 2010-05-06 Maiello Dennis R Apparatus and method for a modulating burner controller
US9828940B2 (en) 2009-07-01 2017-11-28 New Power Concepts Llc Stirling cycle machine
US9534561B2 (en) * 2009-07-01 2017-01-03 New Power Concepts Llc Stirling cycle machine with airlock pressure regulator and burner controls
US9797341B2 (en) 2009-07-01 2017-10-24 New Power Concepts Llc Linear cross-head bearing for stirling engine
US20140000235A1 (en) * 2009-07-01 2014-01-02 Deka Products Limited Partnership Stirling cycle machine
US9822730B2 (en) 2009-07-01 2017-11-21 New Power Concepts, Llc Floating rod seal for a stirling cycle machine
US9823024B2 (en) 2009-07-01 2017-11-21 New Power Concepts Llc Stirling cycle machine
US9453648B2 (en) 2012-03-02 2016-09-27 Honeywell International Inc. Furnace with modulating firing rate adaptation
US8876524B2 (en) 2012-03-02 2014-11-04 Honeywell International Inc. Furnace with modulating firing rate adaptation

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AR196060A1 (en) 1973-11-30
CA930658A1 (en)
CA930658A (en) 1973-07-24

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