Check Valve for a Solenoid Valve and Associated Solenoid Valve

Abstract

A check valve for a solenoid valve inclues a check valve seat that is arranged on an edge of a fluid passage and a movable closing element configured to execute a direction-oriented throughflow and sealing function. The closing element includes a sealing cone, a contact foot with a plurality of outflow grooves formed on the edge, and an elastic sealing ring that is arranged between the contact foot and the sealing cone. The outflow grooves form in each case a seating edge for the elastic sealing ring during sealing. The outflow grooves are configured in each case with an arcuate seating edge, which has a predetermined arc length, so that a circle segment of the elastic sealing ring, with an opening angle in the region of 40° to 120°, butts against the respective seating edge during sealing. A solenoid valve includes the check valve.

Claims

1. A check valve for a solenoid valve, comprising: a check valve seat arranged on an edge of a fluid passage; and a movable closing element configured to execute a direction-oriented throughflow and sealing function, wherein the closing element has a sealing cone, a contact foot with a plurality of outflow grooves formed on the edge, and an elastic sealing ring arranged between the contact foot and the sealing cone, and wherein the outflow grooves (i) form in each case a seating edge for the elastic sealing ring during sealing and (ii) are configured in each case with an arcuate seating edge, which has a predetermined arc length, so that a circle segment of the elastic sealing ring, with an opening angle in the region of 40° to 120°, butts against the respective seating edge during sealing.

2. The check valve according to claim 1, wherein the contact foot has a circular base surface and two outflow grooves, and wherein the two outflow grooves are formed opposite each other on the periphery of the contact foot.

3. The check valve according to claim 1, wherein the seating edges are of convex or concave configuration.

4. The check valve according to claim 1, wherein the outflow grooves are configured as circle segments with a predetermined radius and a predetermined arc length.

5. The check valve according to claim 1, wherein the outflow grooves are configured as circle segments with a predetermined outside radius, a predetermined inside radius, and a predetermined arc length.

6. The check valve according to claim 1, wherein the elastic sealing ring is configured as an O-ring seal.

7. A solenoid valve, comprising: a solenoid sub-assembly; a valve cartridge; and a valve bottom part, wherein a first fluid passage is formed between a fluid inlet and a fluid outlet, the first fluid passage having a flow cross section that is adjustable by a main valve, and wherein a second fluid passage has a flow cross section that is adjustable by a direction-oriented check valve, the check valve including: a check valve seat arranged on an edge of a fluid passage, and a movable closing element configured to execute a direction-oriented throughflow and sealing function, wherein the closing element has a sealing cone, a contact foot with a plurality of outflow grooves formed on the edge, and an elastic sealing ring arranged between the contact foot and the sealing cone, and wherein the outflow grooves (i) form in each case a seating edge for the elastic sealing ring during sealing and (ii) are configured in each case with an arcuate seating edge, which has a predetermined arc length, so that a circle segment of the elastic sealing ring, with an opening angle in the region of 40° to 120°, butts against the respective seating edge during sealing.

8. The solenoid valve according to claim 7, wherein the check valve seat is formed in the valve bottom part.

9. The solenoid valve according to claim 7, wherein the contact foot butts against an abutment in the open state of the check valve.

10. The solenoid valve according to claim 9, wherein one or more of the valve bottom part and a flat filter that is inserted into the valve bottom part form the abutment.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Exemplary embodiments of the disclosure are shown in the drawings and explained in more detail in the following description. In the drawings, the same designations refer to components or elements which perform the same or similar functions.

[0016] FIG. 1 shows a schematic partially sectioned view of an exemplary embodiment of a valve cartridge of a solenoid valve which has a check valve according to the disclosure.

[0017] FIG. 2 shows a schematic perspective view of a first exemplary embodiment of a closing element for the check valve according to the disclosure from FIG. 1.

[0018] FIG. 3 shows a schematic view of the closing element from FIG. 2 from the bottom.

[0019] FIG. 4 shows a schematic perspective view of a second exemplary embodiment of a closing element for the check valve according to the disclosure from FIG. 1.

[0020] FIG. 5 shows a schematic view of the closing element from FIG. 4 from the bottom.

DETAILED DESCRIPTION

[0021] As is apparent from FIG. 1, the depicted exemplary embodiment of a valve cartridge 1 for a de-energized to open solenoid valve comprises a capsule 3, a valve insert 7, an armature 4 with a plunger 5, which features a closing body 5.1 and a main sealing element 5.2, and a return spring 6. A solenoid sub-assembly, which is not shown in more detail, creates a magnetic force which moves the longitudinally movable armature 4 with the plunger 5 against the force of the return spring 6 against the valve insert 7. Moreover, the valve insert 7 accommodates the valve body 8, which includes a main valve seat 8.1, into which the main sealing element 5.2 immerses with sealing effect in order to realize the sealing function of the solenoid valve. As is also apparent from FIG. 1, the depicted valve cartridge 1 comprises a check valve 20 according to the disclosure which executes a direction-oriented throughflow function.

[0022] As is also apparent from FIG. 1, the valve cartridge 1 is caulked in a fluid block 2 via a caulking plate 9 with a receiving hole and separates a primary circuit PK from a secondary circuit SK. Formed between the primary circuit PK or a fluid inlet and the secondary circuit SK or a fluid outlet, in a basic body 11 of the valve bottom part 11, are a first fluid passage 12, the flow cross section of which is adjustable by a main valve, and a second fluid passage 14, the flow cross section of which is adjustable by means of the direction-oriented check valve 20. As is also apparent from FIG. 1, the main sealing element 5.2 and the main valve seat 8.1 form the main valve.

[0023] As is also apparent from FIG. 1, the check valve 20 according to the disclosure in the depicted exemplary embodiment comprises a movable closing element 22, a check valve seat 21 which is arranged in the valve bottom part 10 on the edge of the second fluid passage 14 and a travel limiter or abutment 16.1 which limits the maximum travel of the movable closing element 22. In the depicted exemplary embodiment, the abutment 16.1 is designed as part of a flat filter 16 which is inserted into the valve bottom part 10 and closes this off toward the bottom. Moreover, a ring filter RF is seated on the valve bottom part 10. The valve bottom part 10, the flat filter 16 and the ring filter RF are produced as plastic injection molded parts in the depicted exemplary embodiment. The closing element 22 is entrained by the fluid flow and even in the event of low system pressures is pressed into the check valve seat 21, designed as a hollow cone, into a sealing state. In the opening direction, the closing element 22 is located against the abutment 16.1 by the fluid flow and the fluid can flow through the second fluid passage 14.

[0024] As is apparent from FIGS. 2 to 5, the depicted exemplary embodiments of the movable closing element 22, 22A, 22B for executing the direction-oriented throughflow and sealing function of the check valve 20 according to the disclosure comprise in each case a sealing cone 24, a contact foot 28A, 28B with a plurality of outflow grooves 28.1A, 28.1B formed on the edge, and an elastic sealing ring 26 which is arranged between the contact foot 28A, 28B and the sealing cone 24. The outflow grooves 28.1A, 28.1B form in each case a seating edge 28.2A, 28.2B for the elastic sealing ring 26 during sealing. In this case, the outflow grooves 28.1A, 28.1B are designed in each case with an arcuate seating edge 28.2A, 28.2B, which has a predetermined arc length, so that a circle segment 26.1A, 26.1B of the elastic sealing ring 26, with an opening angle a in the region of 40° to 120°, butts against the respective seating edge 28.2A, 28.2B during sealing.

[0025] As is also apparent from FIGS. 2 to 5, the contact foot 28A, 28B has a circular base surface with a first radius R1 and two outflow grooves 28.1, 28.2 which are formed opposite each other on the periphery of the contact foot 28A, 28B. The elastic sealing ring 26 is designed in each case as an O-ring seal in the depicted exemplary embodiments.

[0026] As is also apparent from FIGS. 2 and 3, the two outflow grooves 28.1A in the depicted exemplary embodiment are designed as circle segments with a predetermined radius R2 and a predetermined arc length. As is also apparent from FIGS. 2 and 3, the radius R2 and the arc length of the circle segments are selected so that the ensuing outflow grooves 28.1A have flat concave seating edges 28.2A. As a result, two first circle segments 26.1A of the elastic sealing ring 26, with an opening angle a in the region of about 40° to 80°, in each case butts against the respective seating edge 28.2A during sealing. As a result of the longer seating edges 28.2A in comparison to the prior art, the local stresses in the event of an extrusion of the elastic sealing ring 26 into the outflow grooves 28.1A are reduced during sealing with constant force.

[0027] As is also apparent from FIGS. 4 and 5, the two outflow grooves 28.1B in the depicted exemplary embodiment are designed as circle segments with a predetermined outside radius R1 and a predetermined inside radius R3 and a predetermined arc length. As is also apparent from FIGS. 4 and 5, the outside radius R1 corresponds to the first radius R1 of the base surface of the contact foot 28B. The inside radius R3 and the arc length of the circle segments are selected so that the ensuing outflow grooves 28.1B have flat convex seating edges 28.2B. As a result, two second circle segments 26.1B of the elastic sealing ring 26, with an opening angle a in the region of about 80° to 120°, in each case butt against the respective seating edges 28.2B. As a result of the longer seating edges 28.2B in comparison to the prior art, the local stresses during an extrusion of the elastic sealing ring 26 into the outflow grooves 28.1B are reduced in a similar way to the first exemplary embodiment during sealing with constant force.

[0028] As a result of the new geometric design of the outflow grooves, embodiments of the check valve according to the disclosure for a solenoid valve advantageously reduce the local stresses which can arise as a result of an extrusion of the elastic sealing element into the outflow grooves.