SOLENOID VALVE

Abstract

A solenoid valve having a movable valve element (5) that is movable by an electromagnet (10), wherein the electromagnet (10) has a magnet pot (13) having a recess (14) in which a solenoid coil (12) fixed on a coil body (11) is arranged. A sealing element (15) is arranged on the coil body (11) or a sealing body (17) fixedly connected to the coil body (11), which sealing element seals the recess (14) of the magnet pot (13) from the outside.

Claims

1. A solenoid valve having a movable valve element (5) that is movable by an electromagnet (10), wherein the electromagnet (10) has a magnet pot (13) having a recess (14) in which a solenoid coil (12) fixed on a coil body (11) is arranged, wherein a sealing element (15) is arranged on the coil body (11) or a sealing body (17) fixedly connected to the coil body (11), which sealing element seals the recess (14) of the magnet pot (13) from the outside.

2. The solenoid valve according to claim 1, wherein the recess (14) has a cylindrical shape.

3. The solenoid valve according to claim 2, wherein the sealing element (15) comprises a sealing ring (115a; 115b).

4. The solenoid valve according to claim 3, wherein the sealing ring is arranged in an annular groove (16a; 16b) in the coil body (11) or in the sealing body (17).

5. The solenoid valve according to claim 3, wherein the sealing ring (115a; 115b) is made from a polymer.

6. The solenoid valve according to claim 3, wherein the sealing ring (115a; 115b) is made from an elastomer or some other plastics material.

7. The solenoid valve according to claim 3, wherein the sealing ring (115a; 115b) is made from PTFE.

8. The solenoid valve according to claim 2, wherein the coil body (11) has a substantially annular shape and the sealing element (15) comprises an outer sealing ring (115a) arranged on an outer side of the coil body and an inner sealing ring (115b) arranged on an inner side of the coil body, wherein the inner and outer sealing rings seal the coil body (11) against walls of the recess (14).

9. The solenoid valve according to claim 8, wherein the inner and outer sealing rings (115a; 115b) are each arranged in an annular groove (16a; 16b) in the coil body (11) or in the sealing body (17).

10. The solenoid valve according to claim 8, wherein the inner and outer sealing rings (115a; 115b) are made from a polymer.

11. The solenoid valve according to claim 8, wherein the inner and outer sealing rings (115a; 115b) are made from an elastomer or some other plastics material.

12. The solenoid valve according to claim 8, wherein the inner and outer sealing rings (115a; 115b) are made from PTFE.

13. The solenoid valve according to claim 1, wherein the sealing element (15) is made from a polymer.

14. The solenoid valve according to claim 1, wherein the sealing element (15) is made from an elastomer or some other plastics material.

15. The solenoid valve according to claim 1, wherein the sealing element (15) is made from PTFE.

16. The solenoid valve according to claim 1, wherein the sealing element (15) seals the recess (14) in a gas-tight and/or liquid-tight manner from the outside.

17. A solenoid valve having a movable valve element (5) that is movable by an electromagnet (10), wherein the electromagnet (10) has a magnet pot (13) having a recess (14) in which a solenoid coil (12) fixed on a coil body (11) is arranged, wherein a sealing element (15) is arranged on the coil body (11), which sealing element seals the recess (14) of the magnet pot (13) from the outside.

18. The solenoid valve according to claim 17, wherein the recess (14) has a cylindrical shape, and wherein the sealing element (15) comprises a sealing ring (115a; 115b) arranged in an annular groove (16a; 16b) in the coil body (11) or in the sealing body (17).

19. A solenoid valve having a movable valve element (5) that is movable by an electromagnet (10), wherein the electromagnet (10) has a magnet pot (13) having a recess (14) in which a solenoid coil (12) fixed on a coil body (11) is arranged, wherein a sealing element (15) is arranged on a sealing body (17) fixedly connected to the coil body (11), which sealing element seals the recess (14) of the magnet pot (13) from the outside.

20. The solenoid valve according to claim 19, wherein the recess (14) has a cylindrical shape, and wherein the sealing element (15) comprises a sealing ring (115a; 115b) arranged in an annular groove (16a; 16b) in the sealing body (17).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The drawings show a solenoid valve according to the invention. In the drawings:

[0009] FIG. 1 is a cross section through a solenoid valve according to the invention with an electromagnet,

[0010] FIG. 2 is an enlarged representation of the electromagnet according to the invention and

[0011] FIG. 3 is an enlargement of the section denoted by III in FIG. 2 of a further embodiment.

DETAILED DESCRIPTION

[0012] FIG. 1 shows a solenoid valve according to the invention in cross section. The solenoid valve comprises a housing 1 that has two inlet openings 2 for supplying the gaseous fuel. An outlet opening 4, via which the gaseous fuel exits the solenoid valve, is formed in a valve seat element 3. To control the flow, a plate-shaped valve element 5 is arranged above the valve seat element 3, which plate-shaped valve element interacts with the valve seat element 3 for opening and closing the outlet opening 4. In this case, the valve element 5 is radially guided on a guide pin 7 that is anchored in the valve seat element 3. The valve element 5 is pretensioned by a plurality of spring elements 8 against the valve seat element 3 and can be moved against the force of said spring elements 8 in the direction of the electromagnet 10 by means of actuation of an electromagnet 10. The electromagnet 10 is arranged in the housing 1 on the side of the valve element 5 opposite the valve seat element 3 and comprises a magnet pot 13 in which a cylindrical recess 14 is formed. A solenoid coil 12, which is fixed on a coil body 11, is arranged in the recess 14. By energizing the solenoid coil 12, a magnetic field is generated that is focused by the magnet pot 13 onto the valve element 5 and moves said valve element away from the valve seat element 3 counter to the force of the spring elements 8 such that the outlet opening 4 is released. If the energization of the solenoid coil 12 is interrupted, the spring elements 8 press the valve element 5 back into its closed position in contact with the valve seat element 3.

[0013] FIG. 2 is an enlarged representation of the electromagnet 10. The coil body 11 has a sealing element 15 on its end facing the valve element 5. The sealing element 15 is in this case in the form of two sealing rings, an outer sealing ring 115a and an inner sealing ring 115b. The outer sealing ring 115a is arranged in an outer annular groove 16a and the inner sealing ring 115b is arranged in an inner annular groove 16b, wherein the two annular grooves 16a, 16b are formed in the coil body 11 and seal the coil body 11 in a gas-tight manner against the inner wall of the recess 14. The contacting of the solenoid coil 12 is effected via connection wires 18 that are each fastened to a connection pin 19 and via which a coil current can be introduced into the solenoid coil 12.

[0014] The sealing element 15 or the sealing rings 115a, 115b are made from a polymer having sufficient elasticity to bring about a gas-tight sealing of the recess 14. The sealing rings 115a, 115b can be manufactured from a polymer, for example an elastomer or some other plastics material. In particular, the sealing rings 115a, 115b can be made from PTFE (polytetrafluoroethylene) because this plastics material has a high chemical resistance.

[0015] FIG. 3 is an enlarged representation of the section denoted by III in FIG. 2 of a further embodiment. The sealing element 15 is in this case not formed directly in the coil body 11, but in a sealing body 17 that is fixedly connected to the coil body 11, for example by means of a welded connection. As a result, the sealing body 17 can be manufactured separately and connected to the coil body 11 before the installation of the electromagnet 10, such that the coil body 11, the solenoid coil 12 and the sealing body 17 can subsequently be introduced into the recess 14 together. The sealing element 15 then closes the recess 14 such that the solenoid coil 12 and the coil body 11 are sealed with respect to the gaseous fuel in the housing 1.