US3659646A - Heat exchanger construction - Google Patents

Heat exchanger construction Download PDF

Info

Publication number
US3659646A
US3659646A US46114A US3659646DA US3659646A US 3659646 A US3659646 A US 3659646A US 46114 A US46114 A US 46114A US 3659646D A US3659646D A US 3659646DA US 3659646 A US3659646 A US 3659646A
Authority
US
United States
Prior art keywords
heat exchanger
pipes
series
gases
face
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 - Lifetime
Application number
US46114A
Other languages
English (en)
Inventor
Bohdan Hurko
Raymond L Dills
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US3659646A publication Critical patent/US3659646A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0025—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being formed by zig-zag bend plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C14/00—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning
    • F24C14/02—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning pyrolytic type
    • F24C14/025—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning pyrolytic type for gaseous fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2225/00—Reinforcing means
    • F28F2225/04—Reinforcing means for conduits
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/355—Heat exchange having separate flow passage for two distinct fluids
    • Y10S165/399—Corrugated heat exchange plate
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making

Definitions

  • the present invention was developed while working toward improved designs of pyrolytic or high temperature self-cleaning gas cooking ovens wherein food soils and grease spatters that had formed on the inner walls defining an oven cooking cavity are degraded into gaseous products that are completely oxidized before they are returned to the kitchen atmosphere.
  • a self-cleaning oven the temperatures rise above about 750 F. and as high as about 950 F. for a sufficient time to complete the transformation, on the order of l to 3 hours.
  • a gas oven only about one-half of the heating value of the gas consumed is used for heating the oven. The remainder is represented by both the heat of exhaust and the heat losses radiating outwardly from the walls of the oven body or cabinet.
  • the principal object of the present invention is to provide a heat exchanger having as its main component a single panel having two intermeshed series of pipes where one series of alternate pipes carry hot flue gases while the opposite series of alternate pipes carry ambient air for transferring some of the heat of the flue gases to the ambient air.
  • a further object of the present invention is to provide a heat exchanger of a collapsed corrugated panel to form a hot front face turned toward the source of heat and a cool back face so as to reduce the heat losses to the outside.
  • a still further object of the present invention is to provide a heat exchanger of the class described with sealing means at the top and bottom of the exchanger, and inlet and outlet openings in the front and back faces thereof to create the proper flow patterns.
  • the present invention in accordance with one form thereof, relates to a heat exchanger having two intermeshed series of pipes formed by a corrugated panel of sheet metal material that is collapsed from the sides to close the corrugations and form substantially flat front and back faces.
  • Clamping means hold the corrugations closed so that there is one series of alternate pipes adapted to carry hot gases while the opposite series of alternate pipes is adapted to carry relatively cool gases for transferring some of the heat of the hot gases to the cool gases.
  • FIG. 1 is a fragmentary transverse, cross-sectional, elevational view through the back end of a gas oven having a heat exchanger embodying the present invention showing a counterflow system where the hot flue gases flow upwardly in a chimney-like manner, while an ambient air flow moves from top to bottom and empties into a firebox in which is disposed a gas burner which when ignited serves to create a draft that draws the ambient air down through the heat exchanger and pass the hot flue gases up through the heat exchanger.
  • FIG. 2 is a back side elevational view of the heat exchanger of FIG. 1 showing the cool face of the exchanger which would be turned to the outside of the oven so as to reduce the heat losses to the outside.
  • FIG. 3 is a fragmentary top cross-sectional plan view in a plane generally through the air inlet openings and the flue gas outlet openings to look directly down through the pipes where the heat transfer takes place between the hot gases and the cool air, as well as showing the resilient sealing material used for closing the ends of the pipes.
  • FIG. 4 is a fragmentary cross-sectional plan view on a slightly enlarged scale of a square-comered corrugated panel of thin sheet metal material which is the starting material for this heat exchanger and which is to be fashioned into the final configuration. This FIG. 4 is also taken on the plane through the air inlet openings and the flue gas outlet openings that are in the back and front faces of the heat exchanger, respectively.
  • FIG. 5 is a cross-sectional plan view similar to that of FIG. 4, but after the panel of FIG. 4 has been compressed at the sides in the plane thereof so as to close the corrugations and hold them closed to form two intermeshed series of triangular shaped pipes, where one series of alternate pipes carry hot flue gases in an upward direction while the opposite series of alternate pipes carry ambient air in a downward direction to establish a counterflow pattern.
  • FIG. 6 is a fragmentary perspective view of the closed corrugated panel construction of the heat exchanger of the present invention showing that the corrugations are not welded or brazed shut, but merely closed and held together by compressive pressure exerted on the opposite sides of the corrugated panel in the plane thereof.
  • FIG. 1 there is shown a counterflow heat exchanger 10 as it would be assembled across the back side of a selfcleaning gas cooking oven.
  • the lower portion of FIG. 1 does show some gas oven structure in order to illustrate the environment in which this invention may be placed and operated advantageously.
  • a bottom wall of the oven body is shown as plate 12.
  • a firebox 14 is positioned in the lower portion of the oven and it is adapted to contain a gas bake burner 16.
  • a shield 18 underlies the gas burner 16 and forms an air channel 20 therebeneath.
  • This shield 18 is provided with a series of elongated slots 22 which are disposed directly beneath the burner 16 for providing secondary air flowing around the outside of the burner during the operation of the burner.
  • An angle iron 21 is mounted across the back of the oven body to form a support for the rear of a box-like oven liner 23.
  • the bottom wall 24 of the oven liner serves as the top wall of the firebox 14.
  • FIG. 4 shows a cross-sectional plan view of a square-cornered corrugated panel 25.
  • This panel may have a height the same as the oven liner with which the heat exchanger is to be combined, although this may vary depending upon the size of the oven, the heating rates of the burners and the temperature ranges encountered without departing from the scope of the present invention.
  • This particular corrugated pattern has rather sharp radii 27, 28 and 29 and 30, and a generally alternate rectangular, zig-zag or serpentine crosssection.
  • This panel 25 is made of thin sheet metal material such as aluminum or stainless steel and such thin metal stock has a normal tendency to collapseinto the closed configuration shown in FIG. 5.
  • a resilient pad 38 such as fiber glass or the like.
  • This sealing means tends to prevent intennixture of the flue gases of pipes 40 with the ambient air of pipes 50.
  • These pipes 40 and 50 now become individual pipes, and other means must be provided for the gas andair to gain entry into and expanel so that 'haust from such pipes.
  • the front face 32 of the heat exchanger is adapted to be turned toward the back side of the oven, while the back face 34 is facing away from the oven. In this back face 34, a series of spaced air inlet openings 42 are formed in the top portion thereof communicating with the alternate pipes 50, as is best seen in FIG. 6.
  • a manifold 44 is assembled over the plurality of air inlet openings 42 as is seen in FIGS. 1 'and2. Ambient air is allowed to flow into the opposite ends of the manifold 44 since the ends are left open. This manifold also tends to space the heat exchanger away from any kitchen wall against which the oven might be placed, such that the kitchen wall will not tend'to block the air movement through the heat exchanger.
  • This manifold 44 is adapted to be fastened in place by screw means 46 which extend through openings in a bottom flange thereof and are threaded into the back face 34 of the heat exchanger.
  • the top portion 48 of the manifold 44 is adapted to fit over the resilient pad 38 in the manner of acover plate and hold the pad in place. Similar air outlet openings 52 are formed in the bottoms of the pipes 50, as is also shown in the perspective view of FIG. 6.
  • An elongated collecting box 54 is assembled across the air outlet openings 52 for receiving the air as it exits from the bottom of the heat exchanger 10. This box 54 supplies the air to the bottom air channel from which it rises through the slots 22 in the shield 18 for passing over the gas burner 16 as preheated secondary air. 1
  • the hot flue gasesfrom the burner 16 are adapted to raise the temperatureof the oven cooking cavity (not shown). After this occurs the gases are to be expelled to the atmosphere.
  • the flue gases are adapted to flow through the heat exchanger 10 first. This may be done either as a parallel flow or a counterflow pattern.
  • a parallel flow pattern might have the air and flue gases entering at the top of the heat exchanger and the heater air and the flue gases at reducedtemperature exhausting at the bottom of the heat exchanger. This might require a forced draft of the flue gases through the heat exchanger.
  • the counterflow system is illustrated in the present drawings.
  • FIG. 1 shows a muffle oven design where the flue gases pass from thefirebox 14 around the outside of the oven liner 23 and then down the back thereof where they enter into the series of spaced flue gas inlet openings 58.
  • a flowthrough heating system could also employ the heat exchanger of the present invention.
  • front face 32 operates at a high temperature and is disposed 'facing the source of the hot "flue gases; namely the oven liner '23, while the opposite face or back face 34 of the heat exchanger is a cool face and itis facing away from the oven.
  • a heat exchanger for use in the flue gas exhaust system of a self-cleaning gas oven, said heat exchanger comprising a folded corrugated panel with two intermeshed series of triangular shaped pipes, one series of alternate pipes being adapted to carry ambient air and the other series of alternate pipes being adapted to carry hot flue gases, whereby one face of the heat exchanger is a relatively cool face and the opposite face is a hot face, sealin'g'means at each end of the heat exchanger for closing the ends of the pipes and preventing intermixture between the air and gases of the two series of pipes, air inlet and outlet openings formed at opposite ends of the pipes at the cool face and flue gas inlet and outlet openings fonned at opposite ends of the pipes at the hot face.
  • a heat exchanger comprising two intermeshed series of triangular shaped pipes formed by'a square-cornered corrugated panel that is closed to formafront and a back face, one series of alternate pipes being adaptedto carry hot gases and another series of alternate pipes adaptedtozcarry'ambient'air, sealing means at each end of the heat exchanger for closing the ends of the pipesandpreventing intermixture of the air and gases, the front faced the heatexchanger having gas inlet openings at one end and gas outlet openings adjacent the opposite end, the back ofthe heat exchanger having air inlet openings at one end and air outlet openings adjacent the opposite end.
  • a heat exchanger as recited in claim 3 wherein the heat exchanger is adapted to be vertically arranged with the gas inlet openings arranged adjacent the bottom to create a chimney effect with the hot gases rising through the heat exchanger, while the air inlet openings are arranged adjacent the top of the heat exchanger and the air is adapted to flow downwardly through the heat exchanger by a suction created downstream of the air outlet openings.
  • a heat exchanger having two intermeshed series of pipes formed by a square-cornered corrugated panel of thin walled sheet metal material that is collapsed'from the sides to close the corrugations and form a substantially flat front and back face, clamping means for'holding the corrugations closed, one series of alternate pipes being adapted to carry hot gases while the opposite seriesof alternate pipes is adapted to carry relatively cool gases for transferring some of the heat of the hot gases to the cool gases.
  • a counterflow heat exchanger for use in the flue gas exhaust system of a self-cleaning gas oven, said heat exchanger comprising a corrugated panel of thin sheet metal material that is collapsed transversely in the plane of the panel to close the corrugations and to form two intermeshed series of pipes where one series of alternate pipes is adapted to carry hot flue gases while the opposite series of alternate pipes is adapted to carry ambient air for transferring some of the heat from the flue gases to the ambient air, and clamping means for holding the corrugations closed, the front face of the heat exchanger being near the flue gas pipes and operating relatively hot while the back face of the heat exchanger is nearest the ambient air pipes and it operates relatively cool, the front face being disposed toward the source of hot flue gases while the back face is disposed toward the outside.
  • a counterflow heat exchanger as recited in claim 8 including sealing means at the opposite ends of the pipes for closing the pipes, gas inlet openings in the front face of the heat exchanger adjacent the bottom portion thereof, gas outlet openings in said front face adjacent the top portion thereof, air inlet openings in said back face adjacent the top portion thereof and air outlet openings in said back face adjacent the bottom portion thereof, and suction means adapted to be connected to the air outlet openings for drawing the ambient air down through the heat exchanger.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US46114A 1970-06-15 1970-06-15 Heat exchanger construction Expired - Lifetime US3659646A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4611470A 1970-06-15 1970-06-15

Publications (1)

Publication Number Publication Date
US3659646A true US3659646A (en) 1972-05-02

Family

ID=21941699

Family Applications (1)

Application Number Title Priority Date Filing Date
US46114A Expired - Lifetime US3659646A (en) 1970-06-15 1970-06-15 Heat exchanger construction

Country Status (4)

Country Link
US (1) US3659646A (enrdf_load_stackoverflow)
DE (1) DE2129192A1 (enrdf_load_stackoverflow)
FR (1) FR2095268B1 (enrdf_load_stackoverflow)
GB (1) GB1346928A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4063590A (en) * 1976-10-22 1977-12-20 Mcconnell Christopher L Preheater for clothes dryer
US4928667A (en) * 1989-09-12 1990-05-29 Tri Fire Holdings, Ltd. Gas fire heating unit
US5078208A (en) * 1989-04-19 1992-01-07 Urch John F Isolating heat exchanger
US20100071885A1 (en) * 2008-09-19 2010-03-25 Asia Vital Components Co., Ltd. Cover structure for core of heat exchanger

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123544B (en) * 1982-07-09 1986-04-23 Thorn Emi Gas Appliances Limit Oven

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1886498A (en) * 1930-03-06 1932-11-08 Metropolitan Eng Co Heat interchanger
US3417742A (en) * 1967-06-02 1968-12-24 Tappan Co Domestic oven
US3507265A (en) * 1968-08-27 1970-04-21 Gen Electric Self-cleaning gas cooking oven

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1886498A (en) * 1930-03-06 1932-11-08 Metropolitan Eng Co Heat interchanger
US3417742A (en) * 1967-06-02 1968-12-24 Tappan Co Domestic oven
US3507265A (en) * 1968-08-27 1970-04-21 Gen Electric Self-cleaning gas cooking oven

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4063590A (en) * 1976-10-22 1977-12-20 Mcconnell Christopher L Preheater for clothes dryer
US5078208A (en) * 1989-04-19 1992-01-07 Urch John F Isolating heat exchanger
US4928667A (en) * 1989-09-12 1990-05-29 Tri Fire Holdings, Ltd. Gas fire heating unit
US20100071885A1 (en) * 2008-09-19 2010-03-25 Asia Vital Components Co., Ltd. Cover structure for core of heat exchanger

Also Published As

Publication number Publication date
DE2129192A1 (de) 1971-12-23
GB1346928A (en) 1974-02-13
FR2095268B1 (enrdf_load_stackoverflow) 1974-05-31
FR2095268A1 (enrdf_load_stackoverflow) 1972-02-11

Similar Documents

Publication Publication Date Title
US3624742A (en) Self-cleaning gas oven with heat exchanger
US3783854A (en) Flow-through self-cleaning gas oven with heat exchanger
US4776320A (en) Device for inhibiting NOx formation by a combustion system
US3587557A (en) Self-cleaning gas oven
US4730600A (en) Condensing furnace
US3659646A (en) Heat exchanger construction
US4619604A (en) Flame radiator structure
US4867673A (en) Condensing furnace
CN106524149A (zh) 一种鼓抽式自预热燃烧平面加热器
CN100507370C (zh) 一种中餐炒菜炉
US4256082A (en) Warm air furnace
US4182302A (en) Wood burning stove
CN2351452Y (zh) 直混式热风炉
US3624743A (en) Gas-cooking oven with oven scavenging means
US2923349A (en) Gas furnace construction
EP0551807A1 (en) Forced convection ovens for cooking food.
US2963083A (en) Gas burner structure
CN212644702U (zh) 一种具有导流结构的燃油灶具
US4181116A (en) Stove
RU2004879C1 (ru) Универсальна блочно-модульна полева кухн
CN213686928U (zh) 一种新型红外线余热回收节能大锅灶
CA1075991A (en) Stove
US3985115A (en) Hot air furnace
US1817801A (en) Combustion chamber
US3247838A (en) Fuel burner