Pipes and tubular conduits – With flow regulators and/or baffles – Restrictors
Patent
1997-08-19
1999-02-16
Bennett, Henry
Pipes and tubular conduits
With flow regulators and/or baffles
Restrictors
237 123C, F15D 5500
Patent
active
058710337
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to an air intake fitting for the combustion air of a heater, especially of a motor vehicle heater, with a variable flow cross section.
BACKGROUND OF THE INVENTION
The flow cross section is changed in such prior-art air intake fittings by perforated disks arranged in the axial opening, with which the free flow cross section is varied by mutual rotation. In this embodiment, the closed areas of the perforated disks to be mutually rotated may lead to a small maximum flow cross-sectional area. Furthermore, dirt particles may be easily drawn into the heater with the combustion air drawn in in the case of axial flow of the combustion air into the air intake fitting.
SUMMARY AND OBJECTS OF THE INVENTION
In light of this, the present invention deals with the problem of making an air intake fitting of this class functionally better and more efficient. In particular, a filter shall be able to be provided for the air drawn in at the fitting in a structurally simple manner.
According to the invention, an air intake fitting for the combustion air of a heater is provided, especially a motor vehicle heater. The air intake has a variable intake air flow cross section. The air intake fitting is tubular, axially closed and is provided with radial openings. The radial openings have cross sections that can be changed by a ring. The ring is attacked coaxially rotatably radially on the outside and is likewise provided with radial openings.
The present invention is based on the idea that a larger, variable intake flow cross-sectional area can be created on the radial circumference of an air intake fitting than in the axial inlet opening.
By designing the rotatable ring with a U-shaped cross section, a flow deflection of the air to be drawn in can be achieved.
The circumferential position of the ring can be locked in different rotated positions depending on the desired size of the intake flow cross-sectional area. Different intake cross sections are used in the heaters of this type to avoid tolerances in the output of the intake blower. Such tolerances arise due to the fact that the air blowers used in practice operate with different rated speeds of rotation located within a tolerance range due to reasons related to manufacture. To obtain a predetermined amount of air drawn in with an air blower, the intake cross section of the air intake fitting is adapted to the actual rated speed of the blower motor in an installed blower.
The axial closure of the air intake fitting is preferably formed by a rotatable ring.
A hood with a filter, in which flow in the radial direction is possible, may be attached to the ring. Such a hood can be attached especially advantageously if the air intake fitting opens into a conically shaped front wall of the heater, because the space located between the axial end of the fitting and the space located radially outside the fitting before the conical front wall of the heater housing can be utilized without increasing the axial length of the volume of the heater. A filter, through which flow in the radial direction is possible, can be accommodated in a rather advantageous manner in the space located radially outside the air intake fitting before the conical front wall. Such an annular space makes it possible to obtain a relatively large filter area.
The annular space may be utilized, in particular, for filtration according to the centrifugal principle. Thus, the hood attached to the fitting may be equipped with spiral flow channels, through which the air being drawn in is to be guided. A relatively high velocity of flow with spiral direction of flow, in which dirt particles are filtered out of the air being drawn in, can be achieved by narrow cross-sectional shapes of the spiral channels.
Instead of a centrifugal filter, a ring filter through which radial flow is possible may also be easily accommodated.
One particular advantage of the present invention is, e.g., the fact that due to the radial flow of the air being drawn in through the air intake
REFERENCES:
patent: 2346966 (1944-04-01), Heymann
patent: 4144016 (1979-03-01), Takahashi et al.
patent: 4754600 (1988-07-01), Barbier et al.
Keinert Helmut
Schodt Adolf
Bennett Henry
Boles Derek S.
J. Eberspacher GmbH & Co.
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