Heating systems – Heat and power plants – Vehicle
Patent
1995-11-01
1998-03-17
Doerrler, William
Heating systems
Heat and power plants
Vehicle
237 49, 126110A, 126110B, F24H 704
Patent
active
057277303
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an air heating device with a hot air fan located in a housing to deliver hot air from an air inlet opening which is located on the face side via a heat exchanger to a hot air exit opening located on the opposite face.
An air heating device of this type is known from DE-U 77 02 288. In this heating device the disadvantage is that the face with the air inlet opening when installed in a vehicle, for example, in the passenger compartment of the latter, must always have a sufficient interval from an adjacent part in order that enough hot air can be delivered. As space becomes increasingly cramped in modern vehicles this can lead to the fact that a heating device of this type either cannot be installed at all or only with expensive deflection adapters which are attached on the face end of the heating device on the side of the air inlet opening.
The object of the invention is to devise an air heating device which can always intake a sufficient amount of hot air regardless of its installation position without additional parts.
This object is achieved by the fact that the housing near the face air inlet opening on its outside periphery on at least one side has additional air inlet openings. If an air heating device according to the invention is installed with its air inlet-side face directly on a wall in the vehicle, sufficiently large admission cross sections for the hot air are made available by the peripheral-side air inlet openings.
A housing with a roughly rectangular cross section with additional air inlet openings on its top and at least one side wall is advantageous. One embodiment is especially preferred in which the two side walls have additional air inlet openings. An air heating device formed in this way in the extreme case can rest simultaneously on walls or parts of the vehicle with its air inlet-side face and with two adjacent outside walls of the housing and a relatively large inlet cross section is made available by at least one air inlet opening on another open housing wall.
Advantageously the air inlet openings are formed by several parallel slots. It is advantageous for their stability if the wall parts of the housing which lie outside and between the slots are joined to cross pieces located transversely thereto in the form of a grate structure.
The housing is made preferably of plastic in a molding tool, the air inlet openings being at least partially molded in during production in the same cycle.
In another advantageous embodiment the housing on the face and on several walls of its periphery has air inlet openings into which either admission grates which form separate parts or just such cover parts can be selectively inserted. In this way it can be established by the installation shop or the final customer through which of the air inlet openings air is in fact to be intaken. Thus, inserting a cover part for example can prevent suction of hot air for delivery to the vehicle interior from an adjacent part from which oil- or gasoline-containing vapors originate.
In the following one embodiment of the invention is described using the drawing.
FIG. 1 shows a longitudinal section through an air heating device,
FIG. 2 shows a perspective view of a housing,
FIG. 3 shows a detailed representation of an admission grate and
FIG. 4 shows a section through the admission grate of FIG. 3 along line IV--IV.
In FIG. 1, 1 labels an air heating device with housing 2 which has on one face 3 air inlet opening 25 through which by means of hot air fan 4 air is intaken, heated via heat exchanger 5 and delivered via air outlet opening 26 located on opposite face 6 of housing 2 to a vehicle interior to be heated. This air heating device 1 is used for example to heat the driver's compartment of a truck.
Hot air fan 4 formed as a semiaxial fan is driven by means of electric motor 7 which simultaneously drives combustion air fan 8 via a second shaft. The combustion air delivered by the fan is conventionally sent to a burner 9 and there with the fuel supplied via fuel line 10 forms a combustible mi
REFERENCES:
patent: 2732133 (1956-01-01), Lintern
patent: 3358675 (1967-12-01), Voges
patent: 4646966 (1987-03-01), Nussbaum
patent: 4784110 (1988-11-01), Skafte et al.
Galtz Rudiger
Habijanec Stephan
Sallinger Christine
Doerrler William
Safran David S.
Webasto Thermosysteme GmbH
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