Pumps – With condition responsive pumped fluid control – Expansible chamber pump distributor operation modified
Patent
1998-04-01
2000-11-21
Freay, Charles G.
Pumps
With condition responsive pumped fluid control
Expansible chamber pump distributor operation modified
417505, 13751613, 25112901, F04B 4900
Patent
active
061494003
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/CH96/00340 filed Oct. 1, 1996.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method of operating a suction valve of the plate-type of construction comprising a valve plate actuated by an electromagnet.
2. Description of the Prior Art
An electromagnetically controlled suction valve of the plate-type of construction is known from the patent specification DE-679 714. There, the valve plate serves as an armature of an electromagnet, so that the position of the valve plate can be determined by a control of the magnet coil. This known suction valve has the disadvantage that the valve plate has the tendency to stick to the magnetic yoke of the electromagnet which does not permit any reliable, and in particular rapid operation of the suction valve. Furthermore, it is necessary to arrange a magnetic insulation relative to the valve seat, in order to prevent the valve plate serving as an armature sticking at the valve seat. This magnetic insulation has the disadvantage that the application is costly and that the blows brought about by the valve plate bring about substantial wear of the magnetic insulation which greatly shortens the servicing interval for the suction valve.
SUMMARY OF THE INVENTION
It is the object of the present invention to propose a more economical suction valve which is better controllable.
This object is in particular satisfied with a method wherein the valve plate is held by an electromagnet arranged in the catcher, and wherein the electromagnet is controlled with a decaying alternating current for the release of the valve plate, in order to at least partly demagnetize the valve plate, so that the valve plate is reliably released from the valve catcher and does not stick to the valve seat. The apparatus of the invention has a valve catcher with a magnet coil, and also a control device in order to control the magnet coil, and, in particular, to supply it with a decaying alternating current.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded drawing of a suction valve with the plate-type of construction;
FIG. 2 is an electronic control device;
FIG. 3a is a cross-section through a ring body of the valve catcher;
FIG. 3b is a further cross-section through a ring body of a valve catcher with a damper plate and a valve plate;
FIG. 3c is a further cross-section through a ring body of a valve catcher with a damper plate and a valve plate;
FIG. 3d is a cross-section through a further embodiment of a ring body of a valve catcher;
FIG. 4 is a control diagram for a suction valve of the plate-type of construction;
FIG. 5 is a control diagram for a further method of controlling a suction valve of the plate-type of construction;
FIG. 6 is a further embodiment of a suction valve with a valve plate consisting of a plurality of ring-shaped valve plate parts.
DETAILED DESCRIPTION OF THE PREFERRED EXEMPLARY EMBODIMENTS
FIG. 1 shows in an exploded drawing a suction valve 1 comprising a valve seat 2 which is also termed a valve seat plate, a valve plate 3, a damper plate 4 and a catcher 6. These parts are held together by a common central screw 7. The damper plate 4 has openings 4d for the passage of a spring 5 which is arranged to act between the catcher 6 and the valve plate. The suction valve 1 can also be operated with, or also without, a damper plate 4. The valve catcher 6 has a plurality of ring bodies 6a which are all connected together. Each ring body 6a has a groove 6b extending in the circumferential direction, with electrical conductors being arranged in the ring groove 6b and forming a magnet coil 9.
FIG. 3a shows a cross-section through a ring body 6a with the ring groove 6b, so that the ring body 6a adopts the shape of a yoke 6c of a ring body magnet. A magnet coil 9 is arranged in the ring groove and forms an electromagnet. The ring body 6a in accordance with embodiment of FIG. 3a has a cover layer 9a at the side facing the valve plate 3 which hermetically seals off the inner space occupied by the magnet coil relative
REFERENCES:
patent: 5052434 (1991-10-01), Bauer
patent: 5349986 (1994-09-01), Sullivan et al.
Keller Christian
Samland Georg
Freay Charles G.
Maschinenfabrik Sulzer-Burckhardt
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