Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Reexamination Certificate
1999-11-04
2001-04-03
Donovan, Lincoln (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
C335S251000, C251S129150
Reexamination Certificate
active
06211760
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention concerns a solenoid valve of the kind mentioned in the preamble of claim
1
.
In such solenoid valves the closing member is normally integrated in the armature, being a sealing surface inserted in the armature, which, by means of an armature return spring, at currentless (non-magnetised) coil is brought to sealingly bearing against the valve seat, and at magnetised coil is pulled away from the valve seat to permit medium flow through the valve opening. Such a solenoid valve, in which the medium flow is interrupted at currentless coil, is called a normally closed (N.C.) valve. In certain applications it would be advantageous to use a normally open (N.O.) valve, whose construction, however, is usually of a much more complicated nature.
The most frequently used medium flow direction in normal valves of the embodiment described above is into the valve housing, past the closing member and out through the valve opening in the valve seat. This gives a secure closing function, the increasing differential pressure acting upon the closing member to pressing harder against the valve seat. If, however, the flow direction is reversed, it is achieved that if the differential pressure exceeds a certain value, which is determined by the valve opening area and the force influence of the return mechanism, the pressure will move the closing member away from the valve seat and let the medium flow through the valve. In certain cases this function can be desirable as security valve function, but the pressure at which the valve opens is substantially determined in advance by the dimensioning requirements for return mechanism and valve opening determined by the solenoid valve function.
SUMMARY OF THE INVENTION
On the basis of this state of the art, it is the purpose of the present invention to produce a simplified construction of an N.O. solenoid valve. According to the invention this is obtained by the measures stated in the characterising part of claim
1
.
Making the closing member as a separate part in relation to the armature, which member is activated by the armature movement to a rocking movement around a contact point with the valve seat, enables an inversion of the armature movement so that the valve becomes an N.O. valve. However, the force transfer between armature and closing member can also be made without this inversion, so that the valve is an N.C. valve.
Preferred embodiments of valve seat and closing member for production of rolling and/or sliding rocking movements of the closing member on a surface surrounding the valve seat are set forth below.
Preferred embodiments and arrangements of a closing spring for the closing member acting upon the closing member to perform a tight closing against the valve seat. The closing spring can be arranged between the armature and the closing member or, pass through a bore in the armature and rest against the bottom of the armature guide.
Preferably, the rocking movement is produced by means of a projecting edge on the armature or the closing member, respectively, which edge makes the armature act upon the closing member offset in relation to the valve seat centre outside the valve seat diameter.
The offset action can also, be produced or supplemented, respectively, by an asymmetrical arrangement of the armature in relation to the closing member.
When using the solenoid valve comprising a closing spring for urging of the closing member against the valve seat in an application, in which the medium flows in via the valve seat, the security function mentioned above is obtained, the construction according to the present invention giving an additional degree of freedom for the opening pressure of the security valve, which is determined by the valve opening area and the closing spring force, which can be selected rather randomly.
REFERENCES:
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patent: 3692057 (1972-09-01), Barnd
patent: 4103686 (1978-08-01), LeFevre
patent: 4905962 (1990-03-01), Ilijn
patent: 5996912 (1999-12-01), Ren et al.
patent: 26 50 394 (1978-05-01), None
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patent: 42 01 450 (1993-08-01), None
patent: 115747 (1969-11-01), None
patent: 0 486 945 (1992-05-01), None
patent: 0 745 797 (1996-12-01), None
patent: 1472848 (1967-01-01), None
patent: 350 320 (1972-10-01), None
Danfoss A/S
Donovan Lincoln
Lee Mann Smith McWilliams Sweeney & Ohlson
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