DOUBLE CHECK VALVE, PNEUMATIC BRAKING DEVICE, AND VEHICLE

Abstract

A double check valve (100) includes a sleeve (10) with a first inlet opening (11), a second inlet opening (12), an outlet opening (13), and a guide piece (20). The guide piece (20) movable along the longitudinal axis (L) within the sleeve (10), by loading with a fluid-induced pressure, between a first blocking position (S1) and a second blocking position (S2) spaced therefrom, wherein each of the inlet openings (11, 12) is closed at least partly fluid-tightly by the guide piece (20) in one of the blocking positions (S1, S2). The double check valve (100) has a permanent magnet (30, 31, 32, 33), and the guide piece (20) and the permanent magnet (30, 31, 32, 33) are configured to magnetically deflect the guide piece (20) from an intermediate position (Z) arranged between the blocking positions (S1, S2) and/or from one of the two blocking positions (S1, S2).

Claims

1. A double check valve (100), comprising: a sleeve (10) with a longitudinal axis (L), a first inlet opening (11), a second inlet opening (12), and an outlet opening (13), and a guide piece (20), wherein the guide piece (20) is arranged movably in the sleeve (10) and is movable along the longitudinal axis (L) in the sleeve (10) by loading with a fluid-induced pressure, wherein the guide piece (20) is movable between a first blocking position (S1) and a second blocking position (S2) spaced therefrom, wherein each of the inlet openings (11, 12) is closed at least partly fluid-tightly by the guide piece (20) in one of the blocking positions (S1, S2), wherein in the first blocking position (S1) the second inlet opening (12) is opened, and in the second blocking position (S2) the first inlet opening (11) is opened, and at least one magnet (30, 31, 32, 33, 34), wherein the at least one magnet is at least one permanent magnet (30, 31, 32, 33) or at least one electromagnet (34) wherein the guide piece (20) and the at least one permanent magnet (30, 31, 32, 33, 34) deflect the guide piece (20), by way of a magnetic force created by the permanent magnet (30, 31, 32, 33), from an intermediate position (Z) arranged between the blocking positions (S1, S2) and/or from one of the two blocking positions (S1, S2).

2. The double check valve according to claim 1, wherein the at least one magnet (30, 31, 32, 33) is arranged between the blocking positions (S1, S2) along the longitudinal axis (L).

3. The double check valve according to claim 1, wherein the at least one magnet (30, 31, 32, 33) is arranged closer to one of the two blocking positions (S1, S2) than to the other of the two blocking positions (S1, S2) along the longitudinal axis (L).

4. The double check valve according to claim 1, wherein the guide piece (20) contains a permanent magnet (30).

5. The double check valve according to claim 1, wherein the at least one magnet comprises a plurality of permanent magnets (30, 31, 32, 33) and/or electromagnets (34).

6. The double check valve according to claim 5, wherein the plurality of permanent magnets or electromagnets includes one, two, three or four permanent magnets (30, 31, 32, 33).

7. The double check valve according to claim 1, wherein relative to the longitudinal axis (L), a permanent magnet (31, 32, 33) is arranged in the intermediate position (Z), in one of the blocking positions (S1, S2), and/or outside the sleeve (10).

8. The double check valve according to claim 1, wherein the at least one magnet (31, 32, 33) is a ring magnet (35) arranged around the sleeve (10).

9. The double check valve according to claim 1, wherein the at least one magnet includes a first permanent magnet arranged at the first blocking position and a second permanent magnet arranged at the second blocking position.

10. The double check valve according to claim 9, wherein the guide piece includes a further permanent magnet having a first pole and second pole, wherein the first pole of the guide piece is arranged closer to the first blocking position than the second blocking position, wherein the first permanent magnet has a first pole and a second pole, wherein the second pole of the first permanent magnet is arranged closer to the guide piece than the first pole of the first permanent magnet, wherein the second permanent magnet has a first pole and a second pole, wherein the first pole of the second permanent magnet is arranged closed to the guide piece than the second pole of the second permanent magnet.

11. The double check valve according to claim 1, wherein a magnetic force applied to the guide piece toward the first blocking when the guide piece is shifted closer to the first blocking position overcomes the magnetic force applied to the guide piece toward the second blocking position.

12. The double check valve according to claim 1, wherein a ring magnet is arranged at the intermediate position, the ring magnet having a first pole and a second pole, the second pole being disposed radially inward relative to the first pole, wherein the guide piece includes a permanent magnet having a first pole and a second pole, wherein the second pole surrounds the first pole.

13. The double check valve according to claim 1, wherein a repulsive force applied to the guide piece is at a maximum when the guide piece is disposed at the intermediate position.

14. The double check valve according to claim 1, wherein a first permanent magnet is disposed at the first blocking position and having a first pole and second pole, and the guide piece includes a further permanent magnet having a first pole and a second pole.

15. The double check valve according to claim 14, wherein the first pole of the first permanent magnet is closer to the guide piece than the second pole of the first permanent magnet, and the first pole of the guide piece is closer to the first permanent magnet than the second pole of the guide piece.

16. The double check valve according to claim 1, wherein the guide piece includes a permanent magnet having a first pole and a second pole surrounding the first pole and disposed radially outward from the first pole, wherein an electromagnet is disposed at the intermediate position surrounding the intermediate position and activatable to generate a repulsive force on the permanent magnet of the guide piece.

17. The double check valve according to claim 1, wherein the guide piece is magnetically destabilized from the intermediate position.

18. The double check valve according to claim 1, wherein the guide piece is magnetically stabilized toward one or more of the blocking positions.

19. A pneumatic braking device (110) having a double check valve (100) according to claim 1.

20. A vehicle (120a) having a braking device (110) according to claim 19.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Further advantages and features of the present disclosure and their technical effects arise from the figures and the description of the preferred embodiments shown in the figures. In the drawings:

[0022] FIG. 1 shows a schematic illustration of a double check valve according to an embodiment of the present disclosure;

[0023] FIG. 2 shows a schematic illustration of a double check valve according to a further embodiment of the present disclosure;

[0024] FIG. 3 shows a schematic illustration of a double check valve according to a further embodiment of the present disclosure;

[0025] FIG. 4 shows a schematic illustration of a double check valve according to a further embodiment of the present disclosure;

[0026] FIG. 5 shows a schematic illustration of a double check valve according to a further embodiment of the present disclosure;

[0027] FIG. 6 shows a schematic illustration of a force acting on a guide piece of a double check valve; and

[0028] FIG. 7 shows a schematic illustration of a vehicle, in particular a utility vehicle, according to an embodiment of the present disclosure.

DETAILED DISCLOSURE

[0029] FIGS. 1 to 6 each show a schematic illustration of a double check valve 100 according to an embodiment of the present disclosure. Features are described below which are contained in each of the shown embodiments of the double check valve 100.

[0030] In each embodiment, the double check valve 100 has a sleeve 10 and a guide piece 20. The sleeve 10 includes a wall 14 and a chamber 15 inside the sleeve 10 and delimited by the wall 14, wherein the guide piece 20 is movably arranged in the sleeve 10. The sleeve 10 has a longitudinal axis L indicated by a dotted line.

[0031] The guide piece 20 is a slide. The guide piece 20 is for example made of metal overmolded with a plastic, and optionally includes an O-ring for guiding the guide piece 20.

[0032] The sleeve 10 is made of a plastic injection molding, optionally with an inserted holding element of an aluminum diecasting. Optionally, the wall 14 delimiting the chamber 15 has a friction-reducing coating, for example made of PTFE.

[0033] The double check valve 100—in these exemplary embodiments, the sleeve 10—has a first inlet opening 11, a second inlet opening 12, and an outlet opening 13. The first inlet opening 11 and the second inlet opening 12 are arranged on opposite sides of the double check valve 100 or sleeve 10 relative to the longitudinal axis L. The outlet opening 13 is arranged between the first inlet opening 11 and the second inlet opening 12. In the schematic illustrations of FIGS. 1 to 6, the inlet openings 11, 12 are arranged on the end faces of the sleeve 10, and the outlet opening 13 on a casing side of the sleeve 10. In other embodiments (not shown), the double check valve 100 has a different arrangement of inlet openings 11, 12 and outlet opening 13.

[0034] The guide piece 20 is movable in the sleeve 10 along the longitudinal axis L under loading by a fluid-induced pressure. The guide piece 20 is movable between a first blocking position S1, indicated by a dotted line, and a second blocking position S2, spaced therefrom and also indicated by a dotted line. In particular, the first blocking position S1 and the second blocking position S2 are spaced from one another along the longitudinal axis L. Each of the inlet openings 11, 12 can be closed at least partially fluid-tightly by the guide piece 20 in one of the two blocking positions S1, S2. In the first blocking position S1, the first inlet opening 11 is closed fluid-tightly by the guide piece 20 and in the first blocking position S1 the second inlet opening 12 is open. In the second blocking position S2, the second inlet opening 12 is closed fluid-tightly by the guide piece and in the second blocking position S2 the first inlet opening 11 is open.

[0035] An intermediate position Z, indicated by a dotted line, is arranged between the first blocking position S1 and the second blocking position S2. In the intermediate position Z, the guide piece 20 does not block either of the inlet openings 11, 12. Depending on the type of double check valve 100, in the intermediate position Z, the guide piece 20 blocks the outlet opening 13. The embodiments according to the present disclosure prevent the guide piece 20 sticking in the intermediate position Z in that the double check valve 100 has a permanent magnet 30, 31, 32, and/or 33, and the guide piece 20 and permanent magnet 30, 31, 32, and/or 33 are configured to deflect the guide piece 20 out of the intermediate position Z and/or out of one of the blocking positions S1, S2 under a magnetic force created by the permanent magnet 30, 31, 32, and/or 33. In other embodiments (not shown), the double check valve 100 has a different arrangement of blocking positions S1, S2 and the one or more intermediate positions Z.

[0036] FIG. 1 shows a schematic illustration of a double check valve 100 according to one embodiment of the present disclosure.

[0037] The double check valve 100 has a permanent magnet 30. The guide piece 20 contains the permanent magnet 30.

[0038] The double check valve 100 has a first attraction element 41 and a second attraction element 42. The first attraction element 41 and the second attraction element 42 are arranged outside the chamber 15 in which the guide piece 20 is movably arranged. The first attraction element 41 is separated from the second attraction element 42, relative to the longitudinal axis L, by the chamber 15. The first attraction element 41 and the second attraction element 42 are made for example of ferromagnetic metal so as to create a magnetic force between the permanent magnet 30 of the guide piece 20 and the first attraction element 41 or second attraction element 42. The first attraction element 41 creates an attractive magnetic force on the permanent magnet 30 of the guide piece 20, wherein the attractive magnetic force tries to deflect the guide piece 20 into the first blocking position S1. The second attraction element 42 creates an attractive magnetic force on the permanent magnet 30 of the guide piece 20, wherein the attractive magnetic force tries to deflect the guide piece 20 into the second blocking position S2. Thus a sticking of the guide piece 20 in the intermediate position Z can be avoided, because the intermediate position Z is destabilized by the magnetic forces acting in the direction of the first blocking position S1 and the second blocking position S2. In this embodiment, the polarization p1, p2 of the permanent magnet 30 is not shown.

[0039] The first attraction element 41 and the second attraction element 42 are configured and arranged such that the first inlet opening 11 and second inlet opening 12 can be opened. For example, the first attraction element 41 and the second attraction element 42 have a recess and/or opening that does not close the respective inlet opening 11, 12. The first attraction element 41 and the second attraction element 42 are for example annular or hollow cylindrical metal elements.

[0040] FIG. 2 shows a schematic illustration of a double check valve 100 according to a further embodiment of the present disclosure.

[0041] The double check valve 100 of FIG. 2 has two permanent magnets 30, 33, i.e. a plurality of permanent magnets 30, 33. The guide piece 20 contains a permanent magnet 30. A further permanent magnet 33 is arranged between the blocking positions S1, S2 along the longitudinal axis L, wherein the further permanent magnet 33 is a ring magnet 35 arranged around the sleeve 10. The permanent magnet 33 arranged around the sleeve 10 is arranged at the intermediate position Z.

[0042] The permanent magnet 30 contained by the guide piece 20 has a first pole p1 and a second pole p2. For example, the permanent magnet 30 contained by the guide piece 20 is a cylindrical magnet with the first pole p1 in an inner cylinder portion and the second pole p2 in an outer cylinder portion. The first pole p1 is arranged radially inside the second pole p2. The first pole p1 is arranged between the second poles p2 in a direction perpendicular to the longitudinal axis L.

[0043] The permanent magnet 33 arranged around the sleeve 10 has a first pole p1 and a second pole p2. The second pole p2 is arranged facing the sleeve 10 and hence inside the first pole p1 in a direction perpendicular to the longitudinal axis L.

[0044] Because of the arrangement of the permanent magnets 30, 33 and their poles p1, p2, a repulsive magnetic force MR acts between the guide piece 20, or permanent magnet 30 of the guide piece 20, and the permanent magnet 33 arranged around the sleeve 10. Thus the intermediate position Z is reliably destabilized. The arrangement of the further permanent magnet 33 around the sleeve 10 implies that the repulsive magnetic force MR acting on the permanent magnet 30 of the guide piece 20 is at a maximum in the intermediate position Z. The repulsive magnetic force MR is indicated schematically in FIG. 6 by a dotted line.

[0045] The permanent magnet 33 is configured and arranged such that the outlet opening 13 can be opened. In an embodiment, the permanent magnet 33 arranged around the sleeve 10 includes a plurality of permanent magnets advantageously evenly distributed around the sleeve 10.

[0046] FIG. 3 shows a schematic illustration of a double check valve 100 according to a further embodiment of the present disclosure.

[0047] The double check valve 100 of FIG. 3 has three permanent magnets 30, 31, 32, i.e. a plurality of permanent magnets 30, 31, 32. The guide piece 20 includes a permanent magnet 30. Each further permanent magnet 31, 32 is arranged outside the chamber 15 in which the guide piece 20 is movably arranged. One of the further permanent magnets 31 is separated from the other of the further permanent magnets 32 relative to the longitudinal axis L by the chamber 15.

[0048] The further permanent magnets 31, 32 are each arranged along the longitudinal axis L closer to one of the two blocking positions S1, S2 than the other of the two blocking positions S1, S2. A first of the further permanent magnets 31 is arranged closer to the first blocking position S1 than the second blocking position S2. A second of the further permanent magnets 32 is arranged closer to the second blocking position S2 than the first blocking position S1. The first further permanent magnet 31 and the second further permanent magnet 32 are arranged outside the sleeve 10 relative to the longitudinal axis L.

[0049] Each of the further permanent magnets 31, 32 has a first pole p1 and a second pole p2. The permanent magnet 30 contained by the guide piece 20 has a first pole p1 and a second pole p2. The first pole p1 of the permanent magnet 30 contained by the guide piece 20 is arranged, relative to the longitudinal axis L, closer to the first further permanent magnet 31 than to the second further permanent magnet 32. The second pole p2 of the permanent magnet 30 contained by the guide piece 20 is arranged, relative to the longitudinal axis L, closer to the second further permanent magnet 32 than to the first further permanent magnet 31.

[0050] In the embodiment shown, the second pole p2 of the first further permanent magnet 31 faces the first pole p1 of the permanent magnet 30 contained by the guide piece 20. Thus an attractive magnetic force acts between the first further permanent magnet 31 and the permanent magnet 30 contained by the guide piece 20. This achieves a simplified deflection of the guide piece 20 towards the first blocking position S1. The first pole p1 of the second further permanent magnet 32 faces the second pole p2 of the permanent magnet 30 contained by the guide piece 20. Thus an attractive magnetic force acts between the second further permanent magnet 31 and the permanent magnet 30 contained by the guide piece 20. This achieves a simplified deflection of the guide piece 20 towards the second blocking position S2. Thus the first blocking position S1 and the second blocking position S2 are stabilized and the intermediate position Z is destabilized. Each of the further permanent magnets 31, 32 causes a deflection of the guide piece 20 out of the intermediate position Z.

[0051] In one embodiment, the further permanent magnets 31, 32 are arranged in the blocking positions S1, S2 relative to the longitudinal axis L, for example as the ring magnet 35 surrounding the sleeve 10 at the blocking positions S1, S2. In one embodiment, the polarity of the further permanent magnets 31, 32 or one of the further permanent magnets 31, 32 is reversed, whereby a repulsive magnetic force is created which repels the guide piece 20 from the further permanent magnet(s) 31, 32 in order to destabilize the respective blocking position S1, S2.

[0052] Advantageously, the embodiments of FIGS. 2 and 3 may be combined, in that for example the embodiment of the double check valve 100 shown in FIG. 3 has a permanent magnet 33, described with reference to FIG. 2, which is arranged in the intermediate position Z along the longitudinal axis L, wherein the permanent magnet 33 has two different poles p1, p2 relative to the longitudinal axis L. A double check valve 100 according to such an embodiment has four permanent magnets 30, 31, 32, 33.

[0053] FIG. 4 shows a schematic illustration of a double check valve 100 according to a further embodiment of the present disclosure.

[0054] The double check valve 100 of FIG. 4 has two permanent magnets 30, 31, i.e. a plurality of permanent magnets 30, 31. The guide piece 20 includes a permanent magnet 30. A further permanent magnet 31 is arranged outside the chamber 15 in which the guide piece 20 is movably arranged.

[0055] The further permanent magnet 31 is arranged closer to the first blocking position S1 than the second blocking position S2. The further permanent magnet 31 is arranged outside the sleeve 10 relative to the longitudinal axis L.

[0056] The further permanent magnet 31 has a first pole p1 and a second pole p2. The permanent magnet 30 contained by the guide piece 20 has a first pole p1 and a second pole p2. The first pole p1 of the permanent magnet 30 contained by the guide piece 20 is arranged, relative to the longitudinal axis L, closer to the further permanent magnet 31 than the second pole p2 of the permanent magnet 30 contained by the guide piece 20.

[0057] In the embodiment shown, the first pole p1 of the further permanent magnet 31 faces the first pole p1 of the permanent magnet 30 contained by the guide piece 20. Thus a repulsive magnetic force acts between the further permanent magnet 31 and the permanent magnet 30 contained by the guide piece 20. This achieves a simplified deflection of the guide piece 20 out of the first blocking position S1 towards the second blocking position S2. In any case, the symmetry of the magnetic force relative to the longitudinal axis L is thus broken. So the second blocking position S2 is stabilized and the intermediate position Z is destabilized. Alternatively, the polarization of the further permanent magnet 31 or the permanent magnet 30 contained by the guide piece 20 may be reversed, in order to create an attractive force between the further permanent magnet 31 and the guide piece 20.

[0058] Advantageously, the embodiments of FIGS. 2 and 4 may be combined, in that for example the embodiment of the double check valve 100 shown in FIG. 4 contains a permanent magnet 33, described according to FIG. 2, which is arranged in the intermediate position Z relative to the longitudinal axis L, wherein the permanent magnet 33 has two different poles p1, p2 relative to the longitudinal direction L.

[0059] FIG. 5 shows a schematic illustration of a double check valve 100 according to a further embodiment of the present disclosure.

[0060] The double check valve 100 of FIG. 5 has a permanent magnet 30. The guide piece 20 contains the permanent magnet 30, as described with reference to FIG. 2.

[0061] The double check valve 100 of FIG. 5 includes an electromagnet 34. The electromagnet 34 is arranged between the blocking positions S1, S2 along the longitudinal axis L. The electromagnet 34 is arranged in the intermediate position Z. The electromagnet 34 is a ring magnet 35 arranged around the sleeve 10. The electromagnet 34 is configured and arranged such that the outlet opening 13 can be opened.

[0062] The polarization of the electromagnet 34 can be switched by loading the electromagnet 34 with a correspondingly oriented electrical current. In particular, the polarization of the electromagnet 34 can be switched such that a repulsive magnetic force acts between the electromagnet 34 and the permanent magnet 30 contained by the guide piece 20. Thus the intermediate position Z is destabilized.

[0063] In an alternative embodiment, each of the permanent magnets 31, 32, 33 arranged outside the chamber 15 of the sleeve 10, and described with reference to FIGS. 2 to 4, may be replaced by an electromagnet 34. Thus the polarization can be changed to enable targeted switching between an attractive magnetic force and a repulsive magnetic force.

[0064] FIG. 6 is a schematic illustration of a force F acting on a guide piece 20 of a double check valve 100. FIG. 6 illustrates schematically the correlation between the force F acting on the guide piece 20 and the deflection d of the guide piece 20.

[0065] The correlation illustrated by a dotted line represents the correlation between the force F acting on the guide piece 20 and the deflection d of the guide piece 20 according to the prior art, wherein a spring-loaded double check valve 100 has a spring having a rest position in the first blocking position S1. In the first blocking position S1, a spring force k implied by the spring is minimal. On deflection of the guide piece 20 in the direction of the second blocking position S2, the spring force k rises proportionally with the deflection d of the guide piece 20 out of the first blocking position S1, i.e. with the distance between the first blocking position S1 and the guide piece 20. As the deflection d increases, the spring tries ever harder to deflect the guide piece 20 in the direction of the first blocking position S1.

[0066] The correlations illustrated by the continuous lines each represent the correlation between the force F acting on the guide piece 20 and the deflection d of the guide piece 20 according to the present disclosure, wherein for illustrating the curve of a first magnetic force M1, the double check valve 100 has a magnet arrangement according to the present disclosure which creates an attractive magnetic force in the direction of the first blocking position S1, and wherein for illustrating the curve of a second magnetic force M2, the double check valve 100 has a magnet arrangement according to the present disclosure which creates an attractive magnetic force in the direction of the second blocking position S2. The first magnetic force M1 and second magnetic force M2 are maximal in the first blocking position S1 and second blocking position S2. The blocking positions S1, S2 are thus stabilized and the intermediate position Z is destabilized. On deflection of the guide piece 20 in the direction of the second blocking position S2, the first magnetic force M1 falls with the deflection d of the guide piece 20 out of the first blocking position S1, and the second magnetic force M2 increases with the deflection d of the guide piece 20 out of the first blocking position S1. In the intermediate position Z, the magnetic forces M1, M2 compensate for one another. On only minimal deflection d of the guide piece 20 out of the intermediate position Z, one of the magnetic forces M1, M2 prevails and the guide piece 20 is accordingly deflected further out of the intermediate position Z.

[0067] The dotted line shows the correlation between the force F acting on the guide piece 20, here a repulsive magnetic force MR, and the deflection d of the guide piece 20 according to the embodiment of FIG. 2. In this embodiment, the force effect is maximal in the intermediate position Z and falls away towards the two blocking positions S1, S2 with a course of a bell curve.

[0068] FIG. 7 shows a schematic illustration of a vehicle 120a, in particular a utility vehicle 120b, according to an embodiment of the present disclosure.

[0069] The vehicle 120a, in particular the utility vehicle 120b, includes a pneumatic braking device 110. The pneumatic braking device 110 includes a double check valve 100 as described with reference to FIGS. 1 to 6.

[0070] The braking device 110 is here any pneumatic braking device 110 which includes the double check valve 100 as a logic component and/or a dual input separator.

LIST OF REFERENCE PARTS (PART OF DESCRIPTION)

[0071] 10 Sleeve [0072] 11 First inlet opening [0073] 12 Second inlet opening [0074] 13 Outlet opening [0075] 14 Wall [0076] 15 Chamber [0077] 20 Guide piece [0078] 30 Permanent magnet of guide piece [0079] 31 Permanent magnet [0080] 32 Permanent magnet [0081] 33 Permanent magnet [0082] 34 Electromagnet [0083] 35 Ring magnet [0084] 41 First attraction element [0085] 42 Second attraction element [0086] 100 Double check valve [0087] 110 Pneumatic braking device [0088] 120a Vehicle [0089] 120b Utility vehicle [0090] d Deflection [0091] F Force [0092] k Spring force (prior art) [0093] M1 First magnetic force [0094] M2 Second magnetic force [0095] MR Repulsive magnetic force [0096] L Longitudinal axis [0097] p1 First pole [0098] p2 Second pole [0099] S1 First blocking position [0100] S2 Second blocking position [0101] Z Intermediate position