Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1987-04-02
1988-08-09
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
335273, H01F 708
Patent
active
047630914
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
German utility patent 80 29 580, shows a construction for adjusting the air gap of an electrically operable valve by means of narrowing down a flux gap through a closure opening depending on the magnetic excitation of the magnetic coil. As compared to standard magnetic values, this value has the advantage that it may be proportionally energized. It operates steadily and is constructed very simply compared to usual proportional valves.
In such valves, the use of a proportional magnet is not used and the characteristic line depends largely on the basic air gap of the magnetic circuit. This basic air gap is effected by assembly of various components having tolerances. For achieving a sufficiently precise air gap, it is therefore absolutely necessary that the tolerances obtained are compensated by shims. This makes assembly more difficult and the valve more expensive. Similar problems exist in the case of gap arrangements of cam valves or couplings. In such case adjustment for a certain basic air gap must be provided.
BRIEF DESCRIPTION OF THE INVENTION
The invention provides an assembly of components that eliminates expensive and elaborate adjustment operations required of selective assembly despite the use of construction parts having customary tolerances, wherein a basic air gap is effected to obtain a precisely predictable size.
The invention utilizes an adjustable pin connected through a return spring by a press fit with an armature. The basis air gap may be varied by the length of pin force fitted into the armature. In such a construction the pin is provided with a button or collar of predetermined thickness to effect air gap size which may utilize a small spring to compensate for tolerance between the related parts.
When the thickness of the collar on the pin corresponds to the width of the basic air gap, then a suitable adjustment of the assembly is effected by a flat tool to press the pin into the armature until the upper surface of the collar and the rim of the upper surface of the return spring lie in one plane. At that time the pressing tool is released and the return spring can pull the armature up to a precise gap position.
A detailed description of the invention now follows in conjunction with the appended drawing in which:
FIG. 1 shows a cross section through an electrically operated valve utilizing the invention;
FIG. 2 shows a first step in the adjustment of the air gap; and
FIG. 3 shows the final step.
In FIG. 1 an essentially potshaped housing 1 has a magnetic coil 2 which encloses a magnetic core 3. An intermediate cover 4 holds the magnetic coil 2 in the housing 1. The intermediate cover 4 holds a sealing ring 5 to seat the magnetic coil 2 within the housing. The housing 1 is closed by a sealed cover 6. A conic nonreturn armature 7 which is operable by the magnetic field of the solenoid 2 is disposed on one side of the solenoid 2 and carries a pin 8. The pin 8 consists of non-magnetizable material and has an extended valve stem 9. The valve stem 9 extends through a bore 10 in the magnetic core 3 to the other end of the solenoid 2. At one of its ends adjacent to the armature 7, the pin 8 has a button or collar 11. On the opposite end, the valve stem 9 has a conical head 12 which acts with a valve seat 13 to effect a throttling valve 14. The valve 14 is disposed between an inlet 15 and an outlet 16.
Armature 7 is the adjustable component of the arrangement, while the magnetic core 3 is the fixed component.
At one side of armature 7 in housing 1, a return disc spring 17 is disposed axially. The return spring 17 is biased centrally by a disc spring 18 disposed between armature 7 and return spring 17 which engages collar 11, as shown, to take up tolerance.
When solenoid 2 is deenergized, a predetermined basic air gap 19 exists between the magnetic core 3 and the armature 7. In this state, the armature 7 is held by the return spring 17 free of magnetic attraction.
The air gap is predetermined or may be varied in a simple manner as now described. FIG. 2 shows the s
REFERENCES:
patent: 3281741 (1966-10-01), Beliveay
patent: 4034841 (1977-07-01), Ohyama et al.
patent: 4463332 (1984-07-01), Everett
Harris George
Zahnradfabrik Friedrichshafen AG.
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