Heating system for the passenger compartment of a motor vehicle

Details Heating system for the passenger compartment of a motor vehicle Heating system for the passenger compartment of a motor vehicle

1990-04-20

1991-10-15

Bennett, Henry

Heating systems

Automatic control

Heat source is a reverse cycle refrigerating system or heat...

237 123A, 237 123B, 13762566, G05D 2300

Patent

active

050567136

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a heating system including a cooling circuit with a delivery unit for circulating the cooling liquid, and a heating loop connected to the cooling circuit and having a heat exchanger arranged in the passenger compartment of a motor vehicle. The feeding line of the heat exchanger is connected to the cooling circuit at a point downstream of the vehicle engine in the direction of flow of the liquid. The return line of the heat exchanger is connected to the delivery unit of the cooling circuit. A heating system is already commercially available in which, in addition to the delivery unit maintaining the cooling circulation, there is arranged in the heating loop a heating pump which, when required, when the heating system is activated, ensures the proper flow of the cooling water heated by the internal combustion engine through the heat exchanger. However, when there is no longer a need for heat, a solenoid valve arranged between the heating pump and the heat exchanger blocks the supply of heat to the heat exchanger. In this operating condition of the heating system, the heating pump operates against the closed valve, this leading to increased operating noises which, amplified by the vehicle body, acting as a sound board, can be a considerable disturbance. Furthermore, the construction of the known heating system as regards the solenoid valve is very complicated and operation is not very economical in view of the fact that the heating pump, operating against the closed valve, runs constantly when the automatic heating system is switched on.


SUMMARY OF THE INVENTION

The object of the invention is a heating system in which the expensive solenoid valve can be omitted. The object of the invention is achieved by providing in the shut-off device of the heating loop, a chamber-like expansion divided by a movable wall in two sub-chambers. One of the sub-chambers has inlet and outlet ports, and the other chamber has a pressure port. The operating noises of the delivery unit are decisively reduced because, when the shut-off device is closed, the unit acts against both sides of the moveable wall, the oscillations emanating from the delivery unit thereby cancelling each other out, with the result that the troublesome noise generation is at least greatly reduced.
The present invention both as to its construction so to its mode of operation, together with additional objects and advantages thereof, will be best understood from the following detailed description of the preferred embodiment when read with reference to the accompanying drawings .


BRIEF DESCRIPTION OF THE DRAWING

The single drawing FIGURE shows a schematic view of the heating system, according to the invention with a shut-off device shown schematically in section.


DESCRIPTION OF THE PREFERRED EMBODIMENT

A heating system illustrated in the drawing is associated with an internal combustion engine 10, of a motor vehicle (not illustrated further) and is cooled in operation via a cooling-water circuit. From the internal combustion engine, the cooling water flows via conduit sections 12, 14, 16, 18 into an air-cooled radiator 20, known per se, and from the latter, via a further conduit 22 to a delivery unit 24 which, driven by the internal combustion engine, circulates the cooling water in the cooling circuit. The cooling water thus flows in the direction of the arrows 26 through the cooling circuit 10, 12, 14, 16, 18, 20, 24. Connected to the cooling circuit is a heating circuit 28, in which there is a heat exchanger 30, which is installed in the passenger compartment 32 of the motor vehicle. The heating circuit 28 is formed by a loop-like extension of the coolant circuit. In relation to the heat exchanger 30, a feed line 34, 40, 48 of the heating loop 28 is connected to the cooling circuit at a point downstream of the internal combustion engine 10, in the direction of flow 26 in the cooling circuit. This feeding line opens into the intake side of a flow pump 36, to the delivery branch 38 of which is connect

REFERENCES:
patent: 4416307 (1983-11-01), Detweiler

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