Fluid handling – Systems – Dividing into parallel flow paths with recombining
Patent
1999-05-01
2000-08-29
Hepperle, Stephen M.
Fluid handling
Systems
Dividing into parallel flow paths with recombining
13760114, F16K 1110
Patent
active
061093017
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a magnet valve for a fuel-regulated heating and/or cooling system having the characteristics of the preamble to claim 1.
One such magnet valve is known from European Patent Disclosure EP 0 653 990 B1. It is used in particular in fluid-regulated heat exchangers for heating and/or air conditioning systems in motor vehicles. It can be triggered in clocked fashion as a function of temperatures in the heating and/or air conditioning system or in a passenger compartments, and the flow rate required for the heating is determined essentially by the mean time cross section. The time cross section is determined by the time integral of the effective opening cross section. By the fluid pressure in an inlet conduit and/or by a valve spring, a valve member of the magnet valve is opened toward an outlet conduit, and it is closed by a magnet coil, which is supplied with current, of the magnet valve by acting on an armature connected to a lifting rod.
Also seated on the lifting rod, which is lengthened past the valve member, is a bypass valve member that controls a bypass conduit disposed between the inlet conduit and a return conduit. The valve member and the bypass valve member are adapted to one another and to a valve spring in such a way that in the currentless state of the magnet coil, the flow quantity to the outlet conduit is kept constant, regardless of a higher feed volume of a pump. As a result, the time cross section needs to be regulated only as a function of temperature, and not as a function of the feed flow of the pump. The feed flow of the pump, which as a rule is driven by an internal combustion engine, in fact varies with the rotary drive speed, or in other words with the engine rpm.
ADVANTAGES OF THE INVENTION
According to the invention, a plurality of valve units are provided, whose inlet conduits communicate with one another. They are triggerable separately and are associated with various heating heat exchangers. As a result, by simple means, a plurality of heating loops for various locations in a vehicle, for instance for the driver side and the front passenger side, can be regulated separately and independently of one another.
In the currentless state of the valve units, the flow quantity to the outlet conduits is kept constant regardless of a higher inlet flow from the pump. It is expedient for the effective diameters of the valve seats, valve members and bypass valve members and the force of their valve springs are adapted to one another in such a way that the flow quantity in the currentless state is the same for all the valve units and is maintained for those valve units that are currentless even whenever individual valve units are supplied with current. The pressure in the system is thus prevented from rising when the valves are closed and from causing pressure surges. If the valve springs are designed such that the bypass valve members do not open until a given flow to the heat exchangers, such as 1600 liters per hour, then in this range of the feed quantity of the pump there is no loss of heating capacity, since the entire inflow to the valve units is carried on to the heating heat exchangers.
In one feature of the invention, the valve units are disposed in a common valve housing. External connecting lines between the valve units can be dispensed with.
Internal connecting conduits and bypass conduits also reduce the expense for the connections, and the pressure rise is substantially less, so that smaller magnetic circuits can be used. As a result, the costs, use of material, structural volume and weight are all reduced.
The return conduit of the magnet valve can expediently be combined with the return line of the heating heat exchangers in the magnet valve itself, by providing that the return conduit has a suitable connection. If for reasons of given conditions at certain locations in the vehicle the return line can be laid over a shorter or more suitable path, then the return conduit is connected to the return line at is some suitable point outside the
REFERENCES:
patent: 1253344 (1918-01-01), Braun
patent: 2758447 (1956-08-01), Prosek
patent: 3109454 (1963-11-01), Whitlock et al.
patent: 4304259 (1981-12-01), Brunner
patent: 5184773 (1993-02-01), Everingham
patent: 5443241 (1995-08-01), Odaira et al.
patent: 5564458 (1996-10-01), Roth et al.
Hepperle Stephen M.
Robert & Bosch GmbH
Striker Michael J.
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