Valves and valve actuation – Permanent or constantly energized magnet actuator
Patent
1999-02-08
2000-11-14
Walton, George L.
Valves and valve actuation
Permanent or constantly energized magnet actuator
13762544, 25112905, 25112915, F16K 3108
Patent
active
061458066
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a miniaturized solenoid valve comprising a generally parallelepiped housing which contains a solenoid drive and a fluidic space separated therefrom.
According to the current state of art, fluidic and electric or electronic control circuits are built up separately. This means that solenoid valves of fluidic equipment are connected by means of bus lines or separate electric connecting lines to the electric or electronic circuits. Whilst it is possible to integrate electronic components in solenoid valves, no solenoid valves for integration into electric or electronic circuits are available.
The invention provides a miniaturized solenoid valve which is suitable for integration in electric or electronic circuits. This is achieved in that soldering pins, electrically connected to the solenoid drive, protrude from the base surface of the housing of the solenoid valve. The solenoid valve can therefore be placed directly on a printed circuit board and soldered in.
The fluidic connections of the solenoid valve according to the invention are preferably arranged on the top side of the housing opposite the base surface and are therefore easily accessible for being connected with flexible hoses.
In the preferred embodiment, the housing of the solenoid valve is of elongated construction. The width of the housing amounts, for example, to little more than 5 mm. The fluidic space is arranged at one longitudinal end of the housing, and the solenoid drive at the opposite longitudinal end. An actuation lamina extends from the solenoid drive to the fluidic space. This actuation lamina is preferably swivel-mounted in the housing, near the fluidic space by means of a jacket made of an elastic material. By virtue of this design, the actuating lamina forms a lever with a large transmission ratio. The solenoid valve can therefore operate with low switching forces and yet switch relatively high pressures up to approximately 8 bar.
For the integration into electric and electronic circuits it is particularly advantageous to embody the solenoid valve as a pulse-controlled unit, either bistable or monostable. To this purpose, the solenoid drive preferably is provided with a permanent magnet which can move between two soft iron parts, and a solenoid whose current-pulse induced magnetic field moves the permanent magnet against one or the other soft iron part, depending on the polarity of the magnetic field. Without biasing into one or the other switching position, such a solenoid valve is stable in each switching position. By the addition of a biasing spring, the solenoid valve becomes a pulse-controlled monostable valve.
In order to optimize the switching behavior of the solenoid valve according to the invention, in a further development of the invention a drive circuit is provided which for each actuation supplies a current pulse which terminates before the respective change-over position is reached. This ensures not only an optimum switching speed but also a largely bounce-free structure, with the result that the desired switching positions are safely reached and maintained.
Further details and characteristics of the invention result from the following description of a preferred embodiment, and from the illustration to which reference is made and in which:
FIG. 1 shows a schematic longitudinal section of the miniaturized solenoid valve;
FIG. 2 shows a schematic perspective view onto the base surface of the solenoid valve;
FIG. 3 shows a schematic perspective view onto the top side of the solenoid valve;
FIG. 4 shows a diagram to illustrate the method of operation of the solenoid valve.
FIG. 5 shows a schematic partial longitudinal section of the miniaturized solenoid valve with the permanent magnet biased into one of two switching positions.
The solenoid valve has an elongated, narrow and parallelepiped housing 10 consisting of two halves joined together. At one longitudinal end of the housing 10, there is a solenoid drive with a solenoid 12 and a core 14 surrounded by it. Next to the inner end plane of the sol
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Burkert Werke GmbH & Co.
Friedman Stuart J.
Walton George L.
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