US3361127A - Back draft safety device for jacketed gas-heated liquid heaters - Google Patents

Back draft safety device for jacketed gas-heated liquid heaters Download PDF

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Publication number
US3361127A
US3361127A US546902A US54690266A US3361127A US 3361127 A US3361127 A US 3361127A US 546902 A US546902 A US 546902A US 54690266 A US54690266 A US 54690266A US 3361127 A US3361127 A US 3361127A
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US
United States
Prior art keywords
back draft
baille
safety device
shields
gas
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
US546902A
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English (en)
Inventor
Hein Georg
Rottmann Gernot
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.)
Vaillant GmbH
Original Assignee
Joh Vaillant GmbH and 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 Joh Vaillant GmbH and Co filed Critical Joh Vaillant GmbH and Co
Application granted granted Critical
Publication of US3361127A publication Critical patent/US3361127A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • F24H9/2042—Preventing or detecting the return of combustion gases

Definitions

  • a back draft safety device for use in the jacket of a gas appliance which has front and rear walls connected by side walls, the side walls having lateral outlets.
  • the device is positioned above the burner and lateral outlets. It comprises a horizontal baille, which is U-shaped in cross section and which extends between the front and rear walls below the top ilue connection on the jacket and above the lateral outlets.
  • Two shields extend upwardly from the -bafile and transversely thereto. One shield is positioned a given distance away from the rear wall of the jacket and the other shield is positioned the same distance away from the front wall.
  • the shields have a length as measured parallel to the front and rear walls of at least three times the width of the baille as measured in the same direction.
  • This invention relates to a back draft safety device which is disposed internally of an appliance jacket of a gas-heated liquid heater, provided with lateral outlets. Back draft conditions occur when wind blows into the ilue chimney from above. Back draft safety devices are known which direct the back draft together with the rising heating gases to the lateral outlets of the appliance jacket and prevent the back draft from passing into the combustion chamber. To achieve this, the back draft safety device is formed with a baille arranged between the front wall and the backwall in the vicinity of the ilue connecting socket, whereby the back draft is diverted to the lower lateral outlets. When no back draft is present, the rising heating gases ilow around the baille.
  • this object is being attained by providing that shields project beyond the baille. These shields are arranged parallel to the front wall and back wall and spaced therefrom. These shields are effective to restrict the back draft impinging on the baille in its eX- tenr between front wall and back wall so that the ilue gases may still rise in front of and behind the Ipartial 3,361,127 Patented Jan. 2, 1968 ICC back drafts divided -by the baille and diverted towards the lateral outlets and thereby obtain better contact therewith. It has shown that certain residual ilue gas portions still ilow upwardly forwardly and backwardly of the partial back drafts, ilowing between the shields and the front wall and the back wall, respectively.
  • the shields are also drawn in by the back draft over the upper edges of the shields and are entrained thereby. It has shown that by these shields restricting the back draft in one dimension an unobjectionable exhaust of the rising ilue gases is obtained.
  • the length of the shields corresponds at least to three times the width of the baille so that the shields also project laterally from the baille far enough so as to achieve an eilective restriction of the back draft.
  • FIG. 1 illustartes schematically the back draft safety device in elevation
  • FIG. 2 illustrates a side elevation View thereof.
  • a fin block 1 through which water tubes extend, constitutes the head of a heating section 2 in which heating ⁇ gases rise and are in heat exchange with the water ilowing through the iln block 1.
  • a back draft safety device 4 carrying a ilue gas connecting socket 4" above inclined guiding surfaces 4.
  • a baille 7 is mounted in web-like manner.
  • Baille 7 has turned up edges 7.
  • Shields 8, 8' pro- Jiect beyond the baille 7.
  • Shields 8, 8 are positioned parallel to the front wall and back wall (5, 6) at a distance a.
  • the length of the shields 8, 8 corresponds at least to three times the width of the baille 7 so that the shields 8, 8 project laterally from the baille 7.
  • the shields 8, 8 may be provided in such length that they join the inclined guiding surfaces 4.
  • the back draft safety device also has deilector plates 9 which extend upwardly of the fin block 1. These divert the flue gas issuing from the iin block 1 from the outlet openings 3. Under normal conditions, thus, when there is draft present in the ilue pipe 10, the ilue gas will ilow around the baille 7, without the flow resistance being substantially increased thereby. However, when due to unfavorable wind conditions a back draft will issue from the ilue pipe 10, such back draft will impinge on the baille 7 between the shields 8, 8. These shields 8, 8 prevent the back draft from expanding along the baille 7 towards the front wall 5 and the back wall 6.
  • the back draft is cut by the shields 3, 8', divided by the baille 7 and diverted over the edges 7' towards the outlets 3 of the appliance jacket without contacting the front wall 5 and the back wall 6.
  • These partial back drafts carry away a portion of the rising flue gas.
  • the ilue gas may still rise along the front wall 5 and the back wall 6 in a thickness of layer corresponding approximately to the distance a forwardly and backwardly of the back drafts, the contact area between the partial back drafts and the rising ilue gas layer is increased so that a greater amount of ilue gas is deverted by the back drafts and entrained towards the outlet openings 3.
  • a gas burner appliance having a jacket including a front wall, a rear wall, side walls connecting the front and rear walls and having lateral outlets therein, and a ue pipe connection at the top and a back draft safety device embodied in said appliance and positioned above said lateral outlets and between the gas burner and the connection, the improvement comprising: said device including a baille extending between the front and rear walls and directly below said connection; a iirst shield having a face positioned transversely to and intersecting the baille, and parallel to and spaced from the front wall; and a second shield having a face positioned transversely to and intersecting the baille and parallel to and spaced from the rear wall; said shields extending upwardly from said baille.
  • said first shield is a given distance from said front wall and the second shield is the same distance from the rear wall, and the length of the shields as measured parallel to said front and rear walls is at least three times the width of the bale as measured in the same direction.
  • said baille is approximately horizontal and has upwardly extending flanges along the side edges thereof, said flanges extending upwardly a distance substantially less than the height of the shields.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Binders And Loading Units For Sheaves (AREA)
US546902A 1965-05-03 1966-05-02 Back draft safety device for jacketed gas-heated liquid heaters Expired - Lifetime US3361127A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEV28375A DE1289978B (de) 1965-05-03 1965-05-03 Rueckstromsicherung fuer ummantelte gasbeheizte Fluessigkeitserhitzer

Publications (1)

Publication Number Publication Date
US3361127A true US3361127A (en) 1968-01-02

Family

ID=7584088

Family Applications (1)

Application Number Title Priority Date Filing Date
US546902A Expired - Lifetime US3361127A (en) 1965-05-03 1966-05-02 Back draft safety device for jacketed gas-heated liquid heaters

Country Status (11)

Country Link
US (1) US3361127A (enrdf_load_stackoverflow)
AT (1) AT267809B (enrdf_load_stackoverflow)
BE (1) BE680452A (enrdf_load_stackoverflow)
CH (1) CH432780A (enrdf_load_stackoverflow)
DE (1) DE1289978B (enrdf_load_stackoverflow)
DK (1) DK111459B (enrdf_load_stackoverflow)
ES (1) ES326247A1 (enrdf_load_stackoverflow)
FR (1) FR1478270A (enrdf_load_stackoverflow)
GB (1) GB1126702A (enrdf_load_stackoverflow)
NL (1) NL6605905A (enrdf_load_stackoverflow)
SE (1) SE301221B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3601099A (en) * 1968-08-02 1971-08-24 Vaillant Joh Kg Gas-heated once-through positive flow water heaters
US3601118A (en) * 1968-12-03 1971-08-24 Vaillant Joh Kg Downdraft safety device for combustion gas flues
US20020100471A1 (en) * 2001-01-12 2002-08-01 York International Corporation Device for drawing dilution air

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE531032C (de) * 1929-12-06 1931-08-04 Bing Werke Vorm Gebr Bing A G Abgashaube
US2031314A (en) * 1936-02-18 Draft hood
US2487776A (en) * 1946-06-04 1949-11-08 William G Cartter Fuel burning space heater
US2591235A (en) * 1948-05-07 1952-04-01 Affiliated Gas Equipment Inc Individual vertical-type fuelburning heater
US2703569A (en) * 1951-05-21 1955-03-08 Rheem Mfg Co Downdraft diverter assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2031314A (en) * 1936-02-18 Draft hood
DE531032C (de) * 1929-12-06 1931-08-04 Bing Werke Vorm Gebr Bing A G Abgashaube
US2487776A (en) * 1946-06-04 1949-11-08 William G Cartter Fuel burning space heater
US2591235A (en) * 1948-05-07 1952-04-01 Affiliated Gas Equipment Inc Individual vertical-type fuelburning heater
US2703569A (en) * 1951-05-21 1955-03-08 Rheem Mfg Co Downdraft diverter assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3601099A (en) * 1968-08-02 1971-08-24 Vaillant Joh Kg Gas-heated once-through positive flow water heaters
US3601118A (en) * 1968-12-03 1971-08-24 Vaillant Joh Kg Downdraft safety device for combustion gas flues
US20020100471A1 (en) * 2001-01-12 2002-08-01 York International Corporation Device for drawing dilution air

Also Published As

Publication number Publication date
FR1478270A (fr) 1967-04-21
DK111459B (da) 1968-08-26
NL6605905A (enrdf_load_stackoverflow) 1966-11-04
DE1289978B (de) 1969-02-27
CH432780A (de) 1967-03-31
ES326247A1 (es) 1967-07-01
SE301221B (enrdf_load_stackoverflow) 1968-05-27
BE680452A (enrdf_load_stackoverflow) 1966-10-17
GB1126702A (en) 1968-09-11
AT267809B (de) 1969-01-10

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