Magnet valve

Abstract

The invention relates to a magnet valve, having a valve insert and a tappet guided movably in the valve insert via a tappet guide, which tappet is braced on a valve body via a restoring spring resting a contact face of the tappet, and the restoring spring is guided radially from inside on one end by a spring guide of the tappet, the spring guide adjoining the contact face. According to the invention, centering means are present, which are disposed on the tappet in such a way that the restoring spring is centered and radially guided from inside over a substantial portion of its length.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be better understood and further objects and advantages thereof will become more apparent from the ensuing detailed description of preferred embodiments taken in conjunction with the drawings, in which:

FIG. 1 is a schematic sectional view of one exemplary embodiment of a magnet valve of the invention;

FIG. 2 is a schematic perspective view of a tappet for the magnet valve of the invention of FIG. 1;

FIGS. 3 and 4 show schematic sectional views of a detail D of FIG. 1;

FIG. 5 is a schematic sectional view of a further exemplary embodiment of a magnet valve of the invention;

FIG. 6 is a schematic perspective view of a tappet for the magnet valve of the invention of FIG. 5;

FIG. 7 is a schematic sectional view of a conventional magnet valve; and

FIG. 8 is a schematic perspective view of a tappet for the conventional magnet valve of FIG. 7.

Claims

1. A magnet valve comprising a valve body, a valve insert including a tappet guide, a tappet having a contact face, a spring guide adjacent the contact face and a dome, the tappet being guided movably in the tappet guide of the valve insert, a spiral restoring spring engaging the contact face and bracing the tappet on the valve body, one end of the restoring spring being guided radially from inside the spring by the spring guide, and centering means on the tappet centering and guiding the restoring spring from inside over a major portion of the length of the restoring spring.

2. The magnet valve as defined by claim 1, wherein the tappet comprises a tappet cone portion and transition region beyond the spring guide, and wherein the centering means are embodied as at least two axially extending centering ribs, originating at the spring guide of the tappet, the centering ribs lengthening the circumference of the spring guide beyond the tappet cone to inside the transition region of the tappet.

3. The magnet valve as defined by claim 2, wherein the dimensions of the at least two axial centering ribs are adapted in the radial direction to the inside diameter of the restoring spring.

4. The magnet valve as defined by claim 2, wherein the at least two axially extending centering ribs come to an end virtually perpendicularly on one end, which is oriented toward a tappet dome.

5. The magnet valve as defined by claim 3, wherein the at least two axially extending centering ribs come to an end virtually perpendicularly on one end, which is oriented toward a tappet dome.

6. The magnet valve as defined by claim 4, wherein the virtually perpendicular ends of the at least two axially extending centering ribs are embodied in rounded form, and wherein a radius of the rounded portion is dependent on properties of the restoring spring.

7. The magnet valve as defined by claim 5, wherein the virtually perpendicular ends of the at least two axially extending centering ribs are embodied in rounded form, and wherein a radius of the rounded portion is dependent on properties of the restoring spring.

8. The magnet valve as defined by claim 2, wherein the at least two axially extending centering ribs come to an end on one end shallowly at a predeterminable angle, which end is oriented toward the tappet dome.

9. The magnet valve as defined by claim 3, wherein the at least two axially extending centering ribs come to an end on one end shallowly at a predeterminable angle, which end is oriented toward the tappet dome.

10. The magnet valve as defined by claim 8, wherein the ends, coming to an end shallowly at a predeterminable angle, of the at least two axially extending centering ribs have a rounded transition, the radius of the rounded transition being dependent on properties of the restoring spring.

11. The magnet valve as defined by claim 9, wherein the ends, coming to an end shallowly at a predeterminable angle, of the at least two axially extending centering ribs have a rounded transition, the radius of the rounded transition being dependent on properties of the restoring spring.

12. The magnet valve as defined by claim 2, wherein the tappet includes four axially extending centering ribs, which preferably have an average spacing of 90° from one another.

13. The magnet valve as defined by claim 3, wherein the tappet includes four axially extending centering ribs, which preferably have an average spacing of 90° from one another.

14. The magnet valve as defined by claim 4, wherein the tappet includes four axially extending centering ribs, which preferably have an average spacing of 90° from one another.

15. The magnet valve as defined by claim 5, wherein the tappet includes four axially extending centering ribs, which preferably have an average spacing of 90° from one another.

16. The magnet valve as defined by claim 6, wherein the tappet includes four axially extending centering ribs, which preferably have an average spacing of 90° from one another.

17. The magnet valve as defined by claim 7, wherein the tappet includes four axially extending centering ribs, which preferably have an average spacing of 90° from one another.

18. The magnet valve as defined by claim 8, wherein the tappet includes four axially extending centering ribs, which preferably have an average spacing of 90° from one another.

19. The magnet valve as defined by claim 10, wherein the tappet includes four axially extending centering ribs, which preferably have an average spacing of 90° from one another.

20. The magnet valve as defined by claim 1, wherein the centering means are embodied as a lengthened spring guide and a shortened tappet cone and transition region of the tappet, wherein the tappet cone is shifted in the direction of a tappet dome, and wherein the restoring spring is centered and radially guided from inside over the major portion of its length by the lengthened spring guide.