US3828761A - Space heater construction particularly for motor vehicles - Google Patents

Space heater construction particularly for motor vehicles Download PDF

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Publication number
US3828761A
US3828761A US00333362A US33336273A US3828761A US 3828761 A US3828761 A US 3828761A US 00333362 A US00333362 A US 00333362A US 33336273 A US33336273 A US 33336273A US 3828761 A US3828761 A US 3828761A
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US
United States
Prior art keywords
tubular member
casing
outer tubular
heating
flow
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
US00333362A
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English (en)
Inventor
W Rich
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.)
Eberspaecher Climate Control Systems GmbH and Co KG
Original Assignee
J Eberspaecher GmbH and Co KG
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Filing date
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Application filed by J Eberspaecher GmbH and Co KG filed Critical J Eberspaecher GmbH and Co KG
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Publication of US3828761A publication Critical patent/US3828761A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H1/2203—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from burners
    • B60H1/2212—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from burners arrangements of burners for heating air
    • 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
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/06—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
    • F24H3/065—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators using fluid fuel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H2001/2268—Constructional features
    • B60H2001/2271—Heat exchangers, burners, ignition devices

Definitions

  • ABSTRACT Primary Examiner-William F. ODea Assistant Examiner-Larry I. Schwartz Attorney, Agent, or FirmMcGlew and Tuttle [5 ABSTRACT A space heater particularly for vehicles comprising an inner tubular wall defining a combustion chamber for the generation of heating gases having an inner closed end and a side wall with opposite heating gas flow openings.
  • An outer tubular member surrounds the inner tubular member and has a heating air inlet surrounding said combustion chamber and an opposite end adjacent the end of the inner tubular member for the discharge of the heating air.
  • the heating gas flow openings are a tear drop configuration and the heating gases flow from the combustion chamber is axially within the inner tubular member, out through the openings, and then rearwardly in reverse flow over the heating air flow in a flow passage between the outer tubular member and an outside casing.
  • This invention relates in general to space heater construction and in particular to a new and useful space heater particularly for automobiles which includes an inner tubular member having a combustion chamber portion for generating combustion gases and an opposite curved end curved toward respective openings on respective opposite sides leading to reverse flow heating gas passages and which are formed of tear drop configuration.
  • the pipe-section-type passage traversing the annular chamber for the heating air has a circular cross section or an oval cross section which is semi circular at its front end and rear end.
  • This design of the known heaters has the result that the passage connecting the two chambers for the combustion air is subject to relatively rapid destruction of the material by annealing, particularly on its rear side or closed end side because a dead center is formed behind the passage with regard to the heating air surrounding it and having a cooling effect on it in the range of which the rear wall of the passage is unsufficiently cooled or is not cooled at all.
  • a heater which is constructed so that premature material destruction of the parts by annealing is avoided at the critical point of the passage traversing the annular chamber surrounding the combustion chamber.
  • the passage surrounding the heating gas passage has a cross section of a flow body or air foil section which is for example of tear drop form. This design prevents the breaking off of the heating air current and the formation of a dead center on the rear side of the passage.
  • the heating air covers the entire circumference of the passage and produces a uniform cooling so that premature combustion of the material on the rear side of the passage is avoided and the life of the heat exchanger is correspondingly extended. If the life expectancy of the known heat exchanger is to remain unchanged the filament power of the heater can be correspondingly increased without the necessity of increasing the effective surface of the heat exchanger.
  • the heater in cludes an inner tubular member with a combustion chamber at its front end arranged to discharge axially toward the opposite closed end and out through passages or openings of tear drop configuration into an annular return flow passage for flow in an opposite direc tion toward a lateral discharge.
  • the space heating air is directed inwardly in an annular space around the combustion chamber for flow between the combustion chamber and the outer passage for the reverse flow of the heating gases. The heating air is discharged at the opposite end from the inlet toward the closed end of the inner tubular member.
  • a heater particularly for motor vehicles which includes an inner tubular combustion chamber having discharge openings on respective opposite sides which are of tear drop configuration and which permit flow of the heating gases out through the openings and in through an annular reverse flow direction passage for lateral discharge in a space which surrounds a central passage for the flow of the space heating air.
  • a further object of the invention is to provide a heater which is simple in design, rugged in construction and economical to manufacture.
  • FIG. 1 is a top plan view of an automobile'space heater constructed in accordance with the invention
  • FIG. 2 is a front elevational view of the heater shown in FIG. 1;
  • FIG. 3 is a horizontal sectional view taken along the line 3-3 of FIG. 2;
  • FIG. 4 is a section taken along the line 4-4 of FIG.
  • FIG. 5 is a top plan view of the upper part of the inner tubular member forming the annular combustion chamber.
  • FIG. 6 is a side elevational view of the part shown in FIG. 5.
  • the invention embodied therein comprises an automobile space heater generally designated 10 which includes an outer casing or wall 3 in which is positioned an inner tubular member generally designated 2 which is made up of two half parts 2a and 2b.
  • the inner tubular member surrounds a combustion device or heater 1 at its forward end which has a combustion air inlet la and includes means (not shown) for generating combustion or heating gases which are directed out of a pre combustion chamber 1b through a wall 12 into a main combustion chamber portion 14 in which the heating gases flow in the direction of the dotted line arrows 16.
  • the inner tubular member 2 is closed at its rear or inner end 4 and is provided with interior curved walls 4a which aid in deflecting the heating gases in the direction of the curved arrow 16' through openings or passages 14.
  • An outer tubular member 13 is arranged within the shell 3 at a spaced location from its interior walls and from the exterior walls of the inner tubular member 2 except that the location of the openings-14. At the location of the openings 14 the outer tubular member 13 is formed to cause a diversion of space heating air which flows in through an inlet 15 which surrounds the combustion device 1.
  • the space heating air flows in the direction of the arrows 26 through the inlet 15 at which location it surrounds the combustion device or heater 1 and along a passage 11 in heat exchange with the hot gases flowing in the direction of the arrow 16 toward the rear end 4 and also in heat exchange with the heating gases which reverse their flow and flow in the annular space 6 between the outer tubular member 13 and the casing 3 in a direction indicated by the dotted line arrows 16'.
  • the hot combustion gases then exit through a lateral discharge connection 9 as indicated by the dotted line arrows 16".
  • the opening or passage 14 is of air foil or tear drop configuration and the rear or inner end 14a has a smaller diameter than the forward or front end 1411.
  • the opening is bounded by inclined walls 17.
  • the outer tubular member 13 includes a rear end wall 13a which extends obliquely outwardly to the outer casing 3.
  • the opposite or front end includes an outward flaring end 13!) which also extends out to the outer casing 3.
  • each of the inner casing parts 2a and 21) include longitudinally extending raised portions or corrugations 19 which at their highest points come close to the outer tubular member 13 and which define flow paths 21 for the incoming space heating air which flows in the direction of the arrows 26 from the inlet 15 and around the passage 14 and through a discharge opening 34 at the rear end of the unit between the inner tubular member 2 and the outer tubular member 13.
  • the space heating air which flows in the direction of the arrows 26 flows first against the high temperature combustion chamber 1 and also in heat exchange contact between the high temperature gases flowing in the direction of the arrow 16 and the returning gases flowing in the direction of the arrow 16" so that the heat transfer is excellent.
  • the passage 14 in the form of a tear drop configuration the heating gases flowing in the direction of the arrow 16' do not break off on the wall 17 which bounds the passage so that no part of this wall region remains without a cooling by the flow of the gases quickly over the surface and thus the combustion of the material is impossible.
  • the cross sectional flow area of the passage 14 diminishes toward the inner or closed end of the heating gas flow space defined between the outer tubular member 13 and the interior of the wall of the casing 3.
  • This construction improves the outflow of the heating gases and increased the surface bounding the opening 14 so that the possibility of the deterioration of the walls of the parts is reduced.
  • the provision of the longitudinally extending ribs 19 insures that the space heating air will flow substantially parallel to the axis of the heat exchanger. When the parallelly flowing air arrives adjacent the passage 14 which is designed as an air foil configuration it insures that the flow around the air foil will be uniform and will cover the wall 17 which bounds the passage 14.
  • a heater particularly for vehicles comprising an inner tubular member defining a combustion chamber for the generation of heating gases having an inner closed end and an opposite side wall with at least one heating gas flow opening, an outer tubular member surrounding said inner tubular member and having a space heating air inlet surrounding said combustion chamber and defining an annular flow space between said inner and outer tubular members having a discharge opening at the end opposite the combustion chamber, and an outer casing covering said inner and outer tubular members and being at a spaced location from the exterior of said outer tubular member and defining a heating gas passage between said outer tubular member and the interior of said casing and having a heating gas discharge at a spaced location from said heating gas flow opening in the direction toward said combustion cham ber, the heating gas flow opening of said inner tubular member being of air-foil configuration and the outer tubular member having a closing end extending to said casing whereby the heating gases are deflected after they are generated in the combustion chamber and flow axially toward the inner end and thereafter through the opening and in a reverse direction for flow between
  • a heater according to claim 1 wherein said inner tubular member is of a shape that it defines an air foil heating gas flow opening which diminshes in area from the end adjacent the combustion chamber to the opposite end.
  • said inner tubular member is made of two substantially identical half shell parts arranged together to define a tubular member, each shell part having an inner end with a curved closing wall and each part having a heating gas flow opening so that the openings are arranged opposite when the two parts are joined together.
  • a space heater for vehicles comprising combustion means for generating gaseous products of combustion, an inner tubular member surrounding said combustion means and extending longitudinally outwardly from one end thereof, said tubular member having a closed end opposite to said combustion chamber and having side walls with substantially diametrically opposite openings of tear drop configuration, an outer tubular member surrounding said inner tubular member and being spaced therefrom so as to define an air inlet adjacent said means for generating said gaseous products of combustion and a discharge adjacent the closed end of said inner tubular member and a passage for the space heating air between said inner and outer members, an outer casing surrounding said outer tubular member and defining a reverse flow heating gas passage between said casing and said outer tubular member, said outer tubular member having an end wall at each end extending to said casing closing off the gas flow passage at each end, said casing having a discharge opening at the end thereof adjacent said means for generating gaseous products of combustion, the opening of said inner tubular member communicating with the passage between said outer tubular member and said casing so that the gaseous products

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)
US00333362A 1972-03-14 1973-02-16 Space heater construction particularly for motor vehicles Expired - Lifetime US3828761A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2212173A DE2212173A1 (de) 1972-03-14 1972-03-14 Heizgeraet, insbesondere fuer kraftfahrzeuge

Publications (1)

Publication Number Publication Date
US3828761A true US3828761A (en) 1974-08-13

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US00333362A Expired - Lifetime US3828761A (en) 1972-03-14 1973-02-16 Space heater construction particularly for motor vehicles

Country Status (7)

Country Link
US (1) US3828761A (enrdf_load_stackoverflow)
JP (1) JPS49938A (enrdf_load_stackoverflow)
CS (1) CS175451B2 (enrdf_load_stackoverflow)
DE (1) DE2212173A1 (enrdf_load_stackoverflow)
FR (1) FR2175766B1 (enrdf_load_stackoverflow)
SE (1) SE404334B (enrdf_load_stackoverflow)
SU (1) SU564791A3 (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920383A (en) * 1974-06-20 1975-11-18 Electric Furnace Co Fluted surface heat exchanger
US20080017359A1 (en) * 2004-11-26 2008-01-24 Andreas Ludwig Heat Exchanger for an Air Heating Device
US20080201948A1 (en) * 2004-11-26 2008-08-28 Andreas Ludwig Method For Producing A Heat Exchanger
US8910881B2 (en) 2004-11-26 2014-12-16 Webasto Ag Air heater for a motor vehicle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5071965B2 (ja) * 2007-03-19 2012-11-14 三州産業株式会社 温風機
CN102779972B (zh) * 2012-07-12 2015-07-08 肇庆理士电源技术有限公司 一种加酸机及加酸系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT26494B (de) * 1905-03-17 1906-11-26 Friedr Siemens Fa Einrichtung zur Verhinderung des Verlöschens der Flamme bei Gasheizöfen.
US3199504A (en) * 1962-03-09 1965-08-10 Royal Inc Dual purpose space heater

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT26494B (de) * 1905-03-17 1906-11-26 Friedr Siemens Fa Einrichtung zur Verhinderung des Verlöschens der Flamme bei Gasheizöfen.
US3199504A (en) * 1962-03-09 1965-08-10 Royal Inc Dual purpose space heater

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920383A (en) * 1974-06-20 1975-11-18 Electric Furnace Co Fluted surface heat exchanger
US20080017359A1 (en) * 2004-11-26 2008-01-24 Andreas Ludwig Heat Exchanger for an Air Heating Device
US20080201948A1 (en) * 2004-11-26 2008-08-28 Andreas Ludwig Method For Producing A Heat Exchanger
US8910881B2 (en) 2004-11-26 2014-12-16 Webasto Ag Air heater for a motor vehicle

Also Published As

Publication number Publication date
CS175451B2 (enrdf_load_stackoverflow) 1977-05-31
FR2175766A1 (enrdf_load_stackoverflow) 1973-10-26
JPS49938A (enrdf_load_stackoverflow) 1974-01-07
FR2175766B1 (enrdf_load_stackoverflow) 1977-02-04
SU564791A3 (ru) 1977-07-05
DE2212173A1 (de) 1973-09-27
SE404334B (sv) 1978-10-02

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