Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1995-04-06
1996-10-15
Hepperle, Stephen M.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
1375991, 13762529, 137495, 25112903, B60H 100, F01P 714
Patent
active
055644589
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is directed to a timing valve for the discontinuous metering of a volume flow, in particular the flow of cooling water flowing through a heat exchanger of a motor vehicle heater as defined in the preamble of claim 1.
A known timing valve for metering the flow rate of the heating water or cooling water flowing through the heat exchanger of a motor vehicle heater and accordingly for adjusting the heating output is constructed as a magnetically actuated 2/2 directional control valve which is connected between the engine and the heat exchanger in the cooling water circuit of the internal combustion engine leading through the vehicle radiator. A bypass valve is arranged between the input of the 2/2 directional control valve and the output of the heat exchanger and directs the flow of cooling water directly to the input of the :radiator so as to bypass the heat exchanger when the 2/2 directional control valve is closed. Since the cooling water pump arranged in the cooling water circuit between the radiator and internal combustion engine is driven directly by the engine, the volume of the flow of heating water flowing through the heat exchanger in the open phase of the timing valve varies greatly depending on whether or not the engine is idling or at partial load or full load. Therefore, to ensure a constant heating output of the heat exchanger, the timing of the timing valve must also be adapted to the available cooling water and heating water.
ADVANTAGES OF THE INVENTION
The timing valve according to the invention with the characterizing features of claim 1 has the advantage over the prior art that a constant volume flow is always taken off at the outlet of the timing valve regardless of the volume flow available at the inlet of the timing valve. As applied to the heating system of a motor vehicle, this means that a constant flow of heating water always flows through the heat exchanger regardless of the respective operating state of the engine. When the engine is idling, i.e., at a low output of the cooling water pump and reduced cooling water flow at the inlet of the timing valve, the entire amount of available heating water flows through the heat exchanger when the valve element is open. At partial load or full load, a virtually constant portion of the cooling water flow circulated by the cooling water pump flows through the heat exchanger. The residual volume flows to the return via the bypass channel.
In a timing valve constructed in this way, the timing need only be adjusted corresponding to the desired heating temperature and need not also be additionally corrected as a function of the instantaneous operating state of the engine. This substantially simplifies the regulation of the timing of the timing valve for controlling the admission of hot water to the heat exchanger. Accordingly, at a preselected temperature, the timing can be maintained substantially constant and the timing ratio need only be manipulated when changing the desired heating temperature.
Advantageous further developments and improvements of the timing valve indicated in claim 1 are made possible by the steps contained in the additional claims.
In a preferred embodiment form of the invention, the volume flow removable at the outlet is maintained constant in that the bypass valve has a valve seat constructed in the bypass channel and a control cone which is placed on the valve seat by a closing spring. The valve element of the timing valve is arranged in a stationary manner and the control cone is arranged so as to be displaceable axially on a valve rod actuated by electromagnets. The control cone is supported at the valve rod at an annular shoulder so as to be acted upon by the closing spring. The closing force of the closing spring and the angle of taper of the control cone which is acted upon by the pressure in the bypass channel are adapted to one another in such a way that, as the volume flow increases at the inlet, the outlet cross section of the bypass valve is pushed open as a function of the pressure a
REFERENCES:
patent: 2782610 (1957-02-01), Martin
patent: 2836197 (1958-05-01), Johnson
patent: 3994356 (1976-11-01), Smitley
patent: 4361170 (1982-11-01), Peloza
patent: 4466457 (1984-08-01), Brane et al.
patent: 4726325 (1988-02-01), Itakura
patent: 4874010 (1989-10-01), DeJong et al.
patent: 5406975 (1995-04-01), Nakamichi et al.
Pfetzer Johannes
Roth Wolfgang
Hepperle Stephen M.
Robert & Bosch GmbH
Striker Michael J.
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