Pumps – Motor driven – Including means utilizing pump fluid for augmenting cooling,...
Reexamination Certificate
2000-09-28
2001-12-25
Walberg, Teresa (Department: 3742)
Pumps
Motor driven
Including means utilizing pump fluid for augmenting cooling,...
Reexamination Certificate
active
06332759
ABSTRACT:
FIELD OF THE INVENTION
The subject of the present invention is a heating and/or air-conditioning installation comprising a motor-driven fan unit including a motor, a module for varying the speed of the motor , a turbine driven by the motor, and a volute within which the motor is housed and defining an outlet channel for an airflow at the periphery of the turbine.
BACKGROUND OF THE INVENTION
In such an installation, the module for varying the speed of the motor must meet a certain number of constraints, particularly as regards the removal of the heat energy generated by the module, as well as relating to electromagnetic interference. For example, the use of a module of the pulse-width modulation type employs power-pulse switching operations which generate electromagnetic radiation, which is transported particularly by the connecting wires, downstream to the motor and upstream to the control electronics of the module and the power supply wires. The EMI electromagnetic interference standards limit the allowed radiation, which means that the modules, and particularly the modules with pulse-width modulation PWM, comprise filters, as does the motor.
It is certainly possible, as the U.S. Pat. No. 5,070,267 moreover teaches, to house the control module entirely within the motor, but this means designing the motor specifically, and there can the before be no question in such a case of using already existing standard motors. Moreover, implementing such integration poses not inconsiderable problems of cost.
It has been proposed, in addition, to house the module outside the motor, but this is accompanied by the existence of linking wires between the module and the motor which do not ease the solving of the problem of the electromagnetic interference EMI.
This EMI interference is generated by radiation from the linking wires which constitute antennae and/or from the power-supply cabling of the module, which can disturb electronic apparatus (car radio, etc.).
The object of the present invention is to provide a heating and/or air-conditioning installation which makes it possible at least partly to solve the abovementioned problems.
SUMMARY OF THE INVENTION
According to the present invention there is provided a heating and/or air-conditioning installation comprising a motor-driven fan unit including a motor, a module for varying the speed of the motor, a turbine driven by the motor, and a volute within which the motor is housed and defining an outlet channel for an airflow at the periphery of the turbine, wherein the speed-variation module is mounted at the periphery of the motor and features an electrical connector plugged into a complementary connector of the motor, as well as at least one wall made of a thermally conducting material which is in communication with the outlet channel of the volute so as to cool the module.
This assembly, by virtue of a direct connection between the module and the motor, makes it possible to avoid electromagnetic interference being generated by wires for linking between the module and the motor, and, moreover, the mounting position makes it possible easily to put at least one cooling wall in contact with the air originating from the turbine or blower.
In particular, at least one said wall can be arranged in an aperture opening out into the outlet channel of the volute. The cooling can be enhanced by arranging several of these said walls in such a way as to form cooling fins.
It is advantageous for least one said wall to run along a wall of the said aperture formed in the volute and opening out into the outlet channel, this making it possible, in particular, to facilitate mounting by forming a reference surface which forms an end stop when the connector is at the end of connection travel.
Preferably, the said aperture forms part of a channel for cooling the motor, which takes in air from the airflow from the outlet channel of the volute.
The module may feature a face which comes to bear on one face of the volute which forms one side of the outlet channel.
The module may advantageously be of circular-sector shape, so as to match closely to the outer contour of the volute.
The components of the module are advantageously arranged in a casing featuring at least one part made of metal or loaded plastic.
It is advantageous for the casing to feature at least two compartments separated by at least one partition allowing thermal separation and/or isolation with regard to electromagnetic disturbances. In particular, a compartment may include at least one input choke of the module.
In one advantageous embodiment, an airflow channel is formed within the module, with an inlet which communicates with a first region of the outlet channel of the volute, and an outlet which communicates with a second region of the outlet channel of the volute, situated upstream of the first region with respect to the direction of flow of the airflow in the outlet channel.
In another advantageous embodiment, an airflow channel runs along the lower face of the module and communicates with the said outlet channel via a plurality of apertures, so as to pick up, from the outlet channel, an airflow which runs along the said lower face in order to cool the module.
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Aloup Christophe
Boucheret Bernard
Guillemin Jean
Terranova Gilbert
Liniak, Beranato, Longacre & White
Patel Vinud D.
Valeo Climatisation
Walberg Teresa
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