Bistable solenoid valve

Details Bistable solenoid valve Bistable solenoid valve

1995-04-07

1997-02-04

Nguyen, Hoang

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 38, 251 45, 2511292, 251229, F16K 3112, F16K 3102

Patent

active

055990037

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a bistable solenoid valve with a locking mechanism that alternates between two positions to open and close the valve.
2. The Prior Art
A bistable solenoid valve with an immersion core, which can be actuated by one single magnet winding and reset by spring force, is known from DE-OS 38 10 154, said immersion core being supported in a core guide tube connected with the controlled medium. The magnetic circuit contains a permanent magnet, the field of which is alternately intensified and weakened by successive dc-voltage switching pulses of different polarity. Such a solenoid valve, as opposed to a comparable monostable solenoid valve, has the advantage that it requires only short switching pulses in each case; that its energy consumption is low on account of said fact; and that accordingly, the amount of heat collected, which has to be taken into account for its design, is low as well, if not even negligible. On the other hand, the switching system of the aforementioned, known solenoid valve requires relatively great expenditure with respect to material and manufacture because it requires a balancing of forces and, therefore, relatively narrow tolerances to be complied with. Furthermore, the bipolar switching means required for its operation are relatively costly.
The invention is based on the problem of creating a solenoid valve that is simpler and can be manufactured at more favorable cost, accordingly, and which, furthermore, is extremely economical with respect to energy consumption.
A bistable electromagnetic switching system with one single magnet winding and an immersion core, the latter being resettable by spring force, is known already from DE-OS 1 464 419. Said system is to be preferably used for electric switches. For fixing the immersion core in the one of its two final positions, said switching system has an engageable and releasable locking mechanism with a first detent member guided lengthwise, and a second detent member displaceable lengthwise against the first detent member and rotatable in an overlift position around an angle graduation. A spiral pressure spring causes face-side cam gear rims of the two detent members to engage each other--in a way as similarly used in connection with some retractable pens.
The invention is based on the consideration that such a switching system according to aforementioned DE-OS 1 464 419 is, in connection with some additional measures, suitable for solving the above problem in a special way.


SUMMARY OF THE INVENTION

Therefore, according to the invention, said problem is solved by a bistable solenoid valve having a locking mechanism with two locking members and an axially-biasing spring which also resets the movable core into one of its two stable positions.
The use of a switching system of the known type specified in DES-OS 1 464 419, and accommodating in such a system the movable parts of the locking elements including the immersion core in the core guide tube, permit a positively smooth operation of the switching system, which is enhanced even further by using a single common spring within the core guide tube, such spring being surrounded by the medium as well. In this way, the respective solenoid valve is capable of functioning with a minimum amount of actuation energy, which makes it suitable in a special way for battery operation as well, for example in agricultural irrigation installations and remotely located cattle watering tank systems. This applies all the more if the valve is a servo-assisted valve. However, a bistable solenoid valve that is servo-assisted by the controlled medium is known already from DE-OS 41 03 777.
However, the claimed solenoid valve is, furthermore, structured in an extraordinarily simple way, and accordingly can be manufactured at favorable cost, which applies to the indicating circuit as well.
The switching system of the claimed solenoid valve can be basically designed with the same dimensions, and also as a module, like the one of comparabl

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