Heating device for the seating compartment of motor vehicles

Details Heating device for the seating compartment of motor vehicles Heating device for the seating compartment of motor vehicles

1992-02-13

1995-07-11

Tapoical, William E.

Heating systems

Ventilating

Enclosed radiator

415131, 417420, B60H 106

Patent

active

054313406

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a heating device. More particularly the present invention relates to a heating device which has a heating circuit connected to the hydraulic circuit of an internal combustion engine, a delivery pump operated by an electric motor and formed as a flow pump driven by the electric motor via a magnet coupling. Such a device in which the delivery element is arranged so as to be fixed in proximity to the suction opening as seen in the direction of its axis of rotation--specifically for reasons of the efficiency of the pump--is already commercially available. In certain operating states of the heating device the cooling water pump can produce full delivery capacity while the delivery pump located in the heating circuit is stopped. When the heating circuit cannot be separated from the coolant circuit the medium flow produced by the coolant pump flows through the pump of the heating circuit. In so doing the heating circuit pump is then also driven by the medium flowing through it, although the electric motor is stopped. The magnetic coupling between the pump and drive motor is accordingly broken. But it is then impossible to couple the two coupling halves when starting the electric motor subsequently. To bring about a coupling between the two coupling halves, the internal combustion engine and the electric motor would first have to be switched off. But since this defect can also occur when the electric motor is running there is a so-called "overflowing" of the heating circuit pump. This is possible because the delivery quantity of the coolant circuit pump considerably exceeds that of the pump in the heating circuit.


SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide a hearing device for seating compartments of motor vehicles which avoids the disadvantages of the prior art.
in keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a device for heating, in which a delivery element of the pump is displaceable in a longitudinal direction of its axis of rotation between two operating positions, one of which operating positions is closed to a suction opening, while the other operating position is at a distance from the suction opening of a pump chamber.
When the heating device is designed in accordance with the present invention it has the advantage that when the amount flowing through the heating circuit pump is higher while under the influence of the delivery pressure of the coolant circuit pump, the medium flowing in presses the delivery element of the heating circuit pump out of its work position in proximity to the suction opening into the other operating position, so that the flow section is considerably enlarged. The coupling of the two coupling halves is accordingly maintained also during a so-called overflowing of the heating circuit pump.
In accordance with another feature of the present invention one coupling half of a magnet coupling which connects the flow pump with the electric motor is a tubular permanent magnet arranged inside the other coupling half which is bell-shaped and constructed as a permanent magnet. Also, a pot-shaped separating element is connected with a housing enclosing the delivery unit and separates a space for the electric motor from the pump chamber inside the unit housing between two coupling halves.
Still another feature of the present invention is that the pot-base of the separating element forms a support for the armature of the electric motor and for the impeller wheel of the pump. Also, the tubular coupling half can be rotatably supported on an axle held in pot base of the separating element in a cantilevering manner and the impeller wheel on the pump can be arranged at the end face of the tubular coupling half, which end face is remote of the pot base.
It is another feature of the present invention that the axle can projects with a lengthening from the structural component formed by the t

REFERENCES:
patent: 4013384 (1977-03-01), Oikawa
patent: 4639190 (1987-01-01), Ohta
patent: 4722661 (1988-02-01), Mizuno
patent: 4752183 (1988-06-01), Sakurai
patent: 5090944 (1992-02-01), Kyo et al.

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