Webasto-werk W. Baier Gmbh & Co.

Ruediger Galtz

Dieter Goerlich

Alois Reichensdoerfer

A side channel blower of the type used as a combustion air blower for motor vehicle heaters wherein a vaned impeller compresses air within a channel formed in a blower. The blower housing has an inlet opening and a discharge opening, between which there is a cross piece. In order to increase the compression pressure which can be achieved with the side channel blower, the inlet opening is in an axial plane and empties into the side channel in the direction of rotation of the impeller. Furthermore, the cross piece has a substantially uniform length in the circumferential direction of the flower and extends into close proximity to a boundary edge of the inlet opening that extends across the flow channel so that an axial projection of the inlet opening onto the plane of rotation of the impeller is as small as possible relative to the area of the inlet opening in the axial plane. To adjust the output of the blower, a bypass opening is provided in the wall of the side channel, at a point from approximately one-third to one-half the circumferential distance toward the inlet open from the discharge opening. In this way, a blow delivery characteristic can be achieved with the bypass opening open that is substantially directly proportional to that achieved with the bypass opening closed.

Side channel blower

An intermediate housing that is, preferably, developed as a cast part and combines several functions and objectives in itself. The intermediate housing not only houses a driving motor for a combustion air blower and a heating air fan, but the driving motor is also disposed by means of a circumferential support developed in the intermediate housing which, at the same time, serves as a stop during the mounting. By means of an elastic bearing of the driving motor, structure-born noise transmission can be avoided. On one side, a combustion air intake connection piece, a fuel supply pipe receiving opening and an exhaust gas outlet connection piece are integrally formed. For the mounting of the heater at a mounting arrangement, the intermediate housing also has passages for fastening screws that are accessible from the direction of the top side of the heater. A receiving space, that is tightly closable by means of a cap, is provided for containing the electrical supply devices, and an ignition device and a flame detector are also housed in the receiving space. In addition, casing parts of the heater can also be fastened to the intermediate housing. At the outer surface of the intermediate housing, axially extending cooling ribs are formed that have an interrupted axial course and are circumferentially staggered with respect to one another.

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Munich, Germany

Ruediger Galtz