JP2021102995A - On-off valve device - Google Patents

Abstract

To provide an on-off valve device capable of simply and reliably fixing a sealing member of the on-off valve device onto a loading groove.SOLUTION: A tapered inner circumferential surface (19) is formed on an inner circumferential wall of a cylindrical casing (15). A release surface (20) is formed so as to continue to the tapered inner circumferential surface (19). A loading groove (25) is formed on a first valve member (23) which is movably inserted into the casing (15) and a sealing member (26) is loaded on the loading groove (25). A first valve seat (21) formed on the tapered inner circumferential surface (19) and a first valve surface (27) formed on the sealing member (26) can come into contact with each other. A gap (31) is formed between the sealing member (26) and the loading groove (25).SELECTED DRAWING: Figure 1

Description

The present invention relates to an on-off valve device that closes and opens the flow path of a compressed fluid.

Conventionally, there is an on-off valve device of this type provided in the coupling device described in Patent Document 1 (Japanese Patent Laid-Open No. 2017-26131). The prior art is configured as follows.
In the conventional on-off valve device, as shown in FIGS. 3D to 3F, the valve case 60 is formed in a tubular shape, and the protrusion 61 from the inner peripheral wall of the tubular hole is inward in the radial direction of the tubular hole (FIG. 3D). (To the right in FIG. 3F). The valve seat 63 is formed by the tapered inner peripheral surface 62 of the protrusion 61. Further, the valve member 64 is inserted into the tubular hole of the valve case 60 so as to be movable in the vertical direction. The valve member 64 has a rod portion that is slidably inserted into the tubular hole, and a tip portion 65 that is above the rod portion and has a diameter larger than that of the rod portion. A tapered outer peripheral surface 66 is formed on the outer peripheral wall of the tip portion 65, and a mounting groove 67 is formed on the tapered outer peripheral surface 66 in the circumferential direction. A sealing member 68 made of rubber, resin, or the like is mounted in the mounting groove 67. The thin portion 69 is formed by the lower peripheral wall of the mounting groove 67. By pressing the thin portion 69 upward to plastically deform it, the entire peripheral wall of the mounting groove 67 grips the sealing member 68 and fixes it in the mounting groove 67. A part of the sealing member 68 is extruded from the opening of the mounting groove 67 and protrudes outward from the tapered outer peripheral surface 66 of the valve member 64. The valve surface 70 formed on the outer peripheral wall of the sealing member 68 is in surface contact with the valve seat 63.

JP-A-2017-26131

The above-mentioned conventional technique is excellent in that the sealing member can be firmly fixed to the mounting groove by plastically deforming the thin portion of the valve member and the peripheral wall of the mounting groove grips the sealing member. However, if the peripheral wall of the mounting groove is not uniformly pressed against the sealing member, the height of the outer peripheral surface of the sealing member and the elasticity of the sealing member will be uneven, and the mounting work will take time and effort. .. There was room for improvement in that the sealing member of the on-off valve device could be easily and surely fixed to the mounting groove.

In order to achieve the above object, in the first invention, for example, as shown in FIGS. 1 to 3H, the on-off valve device is configured as follows.
A tapered inner peripheral surface 19 is formed on the inner peripheral wall of the tubular casing 15 so as to taper toward the tip end side of the tubular hole of the casing 15 in the axial direction. A continuous relief surface 20 is formed on the base end side of the tapered inner peripheral surface 19 in the axial direction, and the relief surface 20 is formed so as to intersect the tapered inner peripheral surface 19. The first valve seat 21 is formed on the axially proximal end side portion of the tapered inner peripheral surface 19. The first valve member 23 is movably inserted in the tubular hole of the casing 15 in the axial direction. The tapered outer peripheral surface 24 is formed on the outer peripheral wall of the first valve member 23 so as to approach the axial center toward the tip end side. A mounting groove 25 is opened in the circumferential direction on the tapered outer peripheral surface 24. The sealing member 26 is mounted in the mounting groove 25. The first valve surface 27 formed on the outer peripheral wall of the sealing member 26 can come into contact with the first valve seat 21. A gap 31 is formed between the outer peripheral surface of the sealing member 26 on the proximal end side in the axial direction and the inner peripheral surface of the mounting groove 25 on the proximal end side in the axial direction.

The present invention has the following effects, for example, as shown in FIGS. 1 to 3H of the above.
In the on-off valve device of the present invention, the sealing member can be easily and surely fixed to the mounting groove.

In order to achieve the above object, in the second invention, for example, as shown in FIGS. 1 to 3H, the on-off valve device is configured as follows.
A valve seat member 42 is projected from the bottom wall of the mounting hole 41 formed in the casing 40 toward the tip end side of the mounting hole 41 in the axial direction. A tapered outer peripheral surface 43 that tapers toward the base end side is formed on the valve seat member 42 in the circumferential direction. A continuous relief surface 44 is formed on the base end side of the tapered outer peripheral surface 43 in the axial direction, and the relief surface 44 intersects the tapered outer peripheral surface 43. A second valve seat 45 is formed in the circumferential direction on the outer peripheral wall on the base end side in the axial direction of the tapered outer peripheral surface 43. A tubular second valve member 46 is movably inserted into the mounting hole 41 in the axial direction. A tapered inner peripheral surface 46a is formed on the inner peripheral wall of the second valve member 46 so as to taper toward the proximal end side in the axial direction. The sealing member 48 is mounted in the mounting groove 47 opened in the circumferential direction on the tapered inner peripheral surface 46a. The second valve surface 49 formed on the outer peripheral wall of the sealing member 48 in the circumferential direction can come into contact with the second valve seat 45. A gap 50 is formed between the outer peripheral surface of the sealing member 48 on the proximal end side in the axial direction and the inner peripheral surface of the mounting groove 47 on the proximal end side.

FIG. 1 shows an embodiment of the present invention and is a schematic cross-sectional view of a coupling device including an on-off valve device. FIG. 2 is a schematic cross-sectional view showing the connected state of the coupling device. 3A and 3G are partially enlarged views showing parts A and G in FIG. 3C and 3H are partially enlarged views showing the C and H portions in FIG. 2. FIG. 3B is a diagram showing the middle of switching from FIG. 3A to FIG. 3C. 3D to 3F are views showing a conventional on-off valve device, which is similar to FIG. 3A.

1 to 3 show an embodiment of the present invention, and first, the structure of a coupling device including an on-off valve device will be described with reference to FIG.

The movable block 2 is detachably attached to the reference block 1 of the coupling device from above. The coupling device of the present invention has a first joint 5 mounted on the reference block 1 and a second joint 6 mounted on the movable block 2. A first supply / discharge passage 7 is formed in the first joint 5, and a second supply / discharge passage 8 is formed in the second joint 6.

The first casing 10 of the first joint 5 is fixed to the reference block 1 by bolts. The first casing 10 has an outer cylinder 11 and an inner cylinder 12 screwed into the lower part of the inner peripheral hole of the outer cylinder 11. The inner cylinder 12 has a large-diameter portion 12a screwed tightly into the outer cylinder 11 and a small-diameter portion 12b provided above the large-diameter portion 12a. A gap is formed between the small diameter portion 12b and the inner peripheral hole of the outer cylinder 11, and the large diameter portion 15a of the valve case (casing) 15 can move in the vertical direction in a heat-tight manner via the sealing member 12c in the gap. Will be inserted into. A small diameter portion 15b is projected above the large diameter portion 15a. Further, the valve case 15 is inserted by the driving means D so as to be movable in the vertical direction, and the driving means D is configured as follows.

The lock chamber 16 is partitioned by the inner peripheral hole of the outer cylinder 11, the outer peripheral portion of the inner cylinder 12, and the large diameter portion 15a of the valve case 15. The lock chamber 16 is connected to a pressure oil supply source (not shown) via a supply / discharge passage 17. The supply / discharge passage 17 has a flow path 17a formed in the first casing 10 and a flow path 17b formed in the reference block 1. Further, a release spring 18 is provided between the lower surface of the protruding portion 10a projecting inward in the radial direction above the inner peripheral hole of the first casing 10 and the upper surface of the large diameter portion 15a of the valve case 15. It is installed. The release spring 18 urges the valve case 15 downward.

A protruding portion 15c from the upper end of the valve case 15 projects inward in the radial direction of the valve case 15. As shown in FIGS. 3A to 3C, the tapered inner peripheral surface 19 is formed on the inner peripheral wall of the protruding portion 15c so as to taper upward. The relief surface 20 is formed so as to intersect the tapered inner peripheral surface 19 so as to be continuous with the tapered inner peripheral surface 19. The relief surface 20 of the present embodiment is formed so as to be perpendicular to the axial center of the valve case 15, but the present invention is not limited to this, and the relief surface 20 intersects the tapered inner peripheral surface 19 and has an angle. It suffices if it is formed. Further, the first valve seat 21 is formed by the lower end portion of the tapered inner peripheral surface 19, the lower end portion of the tapered inner peripheral surface 19, and the connecting portion between the tapered inner peripheral surface 19 and the relief surface 20. Further, when the corner is processed into a curved surface, the first valve seat 21 may be formed by the connecting portion between the tapered inner peripheral surface 19 and the relief surface 20.

A ring-shaped guide member 22 is fixed to the inner peripheral hole of the small diameter portion 15b of the valve case 15 by a retaining ring. The small diameter portion 23a of the first valve member 23 is inserted into the inner peripheral hole of the guide member 22 so as to be movable in the vertical direction. A large diameter portion 23b is formed on the upper side of the small diameter portion 23a of the first valve member 23. The tapered outer peripheral surface 24 is formed so that the outer peripheral wall of the large-diameter portion 23b approaches the axial center as it goes upward, and has a mounting groove 25 formed in the circumferential direction. An O-ring 26, which is a sealing member, is mounted in the mounting groove 25, a first valve surface 27 is formed on the outer peripheral portion of the O-ring 26, and the first valve surface 27 is the first valve seat 21 of the valve case 15. It is possible to contact with. The O-ring 26 is formed of an elastic body such as rubber or resin. Further, the diameter of the O-ring 26 before mounting is set to be the same as or smaller than the diameter of the bottom wall of the mounting groove 25. Therefore, even if an external force is applied to the O-ring 26 after mounting in a direction away from the mounting groove 25, the O-ring 26 is urged toward the bottom wall of the mounting groove 25 by its own elastic restoring force. Further, a gap is formed between the lower end surface of the O-ring 26 and the vicinity of the peripheral edge of the mounting groove 25. More specifically, the gap 31 is formed at a lower position in the axial direction from the position where the first valve surface 27 and the first valve seat 21 abut. Therefore, when the first valve surface 27 engages with the first valve seat 21, the outer portion retracts into the gap 31 while maintaining the inner portion of the O-ring 26 in close contact with or close to the mounting groove 25. ..

A first valve closing spring (first urging means) 28 is mounted between the guide member 22 and the large diameter portion 23a of the first valve member 23, and the first valve closing spring 28 is the first valve member. 23 is pressed toward the protruding portion 15c of the valve case 15. Therefore, the first valve surface 27 is in contact with the first valve seat 21.

The first supply / discharge passage 7 is a valve opening gap formed between the first valve seat 21 and the first valve surface 27, an inner peripheral hole of the valve case 15, and a communication hole formed in the guide member 22. It is composed of 29 and a first supply / discharge port 30 formed in the inner cylinder 12.

The second casing (casing) 40 of the second joint 6 is fixed to the movable block 2 by bolts. A mounting hole 41 is formed in the second casing 40, and a valve seat member 42 is projected downward from the bottom wall of the mounting hole 41. A tapered outer peripheral surface 43 is formed on the lower outer peripheral wall of the valve seat member 42 in the circumferential direction so as to taper upward, and a relief surface 44 is formed so as to be continuous on the upper side of the tapered outer peripheral surface 43. A corner is formed by the tapered outer peripheral surface 43 and the relief surface 44. The relief surface 44 of the present embodiment is formed so as to be perpendicular to the axial center of the valve seat member 42, but is not limited to this, and is configured to intersect the tapered outer peripheral surface 43. It suffices if it is done. Further, the corner portion of the present embodiment is curved, and the second valve seat 45 is formed on the processed portion (the connecting portion between the tapered outer peripheral surface 43 and the relief surface 44) and the lower end portion of the tapered outer peripheral surface 43. Is formed in the circumferential direction. A tubular second valve member 46 is tightly inserted into the mounting hole 41 via a sealing member so as to be movable in the vertical direction. A tapered inner peripheral surface 46a that tapers upward toward the lower end side inner peripheral wall of the second valve member 46 is formed, and a mounting groove 47 is formed in the tapered inner peripheral surface 46a in the circumferential direction. An O-ring 48 as a sealing member is mounted in the mounting groove 47. A second valve surface 49 is formed on the outer peripheral wall of the O-ring 48 in the circumferential direction, and the second valve surface 49 can come into contact with the second valve seat 45 from above. The O-ring 48 is formed of an elastic body such as rubber or resin.
A gap 50 is formed between the lower surface of the O-ring 48 and the peripheral wall of the mounting groove 47. Therefore, when the second valve surface 49 engages with the second valve seat 45, the outer portion of the O-ring 48 is retracted into the gap 50 while maintaining a state of being in close contact with or close to the mounting groove 47. ..

A second valve closing spring (second urging means) 53 is mounted between the bottom wall of the mounting hole 41 and the second valve member 46, and the second valve closing spring 53 valves the second valve member 46. It is urging toward the seat member 42. Therefore, the second valve surface 49 can come into contact with the second valve seat 45 from above.

The second supply / discharge passage 8 is a communication formed in the valve opening gap formed between the second valve seat 43 and the second valve surface 46, the mounting hole 41, and the bottom wall of the mounting hole 41. It is composed of a hole 54 and a second supply / discharge port 55 formed in the upper part of the second casing 40.

A groove 56 is formed in the lower wall of the second valve member 45 in the circumferential direction so as to open downward, and the sealing member 57 is mounted in the groove 52. As a result, when the valve case 15 is locked and driven upward, the upper end surface of the valve case 15 is brought into contact with the sealing member 57 (see FIG. 2).

The coupling device operates as follows, as shown in FIGS. 1 and 2.
In the separated state of FIG. 1, pressure oil is discharged from the lock chamber 16 of the first joint 5, and the release spring 18 moves the valve case 15 downward. Further, the first valve closing spring 28 moves the first valve member 23 upward.
In the second joint 6 described above, the second valve closing spring 53 moves the second valve member 46 downward.

When switching the movable block 2 from the separated state of FIG. 1 to the connected state of FIG. 2, first, as shown in FIG. 1, the second joint 6 is moved above the first joint 5. Next, when the second joint 6 is moved downward, the sealing member 56 of the second valve member 46 comes into contact with the upper surface of the protruding portion 15c of the valve case 15. Further, as shown in FIG. 2, the supported surface 40a of the second joint 6 comes into contact with the support surface 10b of the first joint 5.
Next, when pressure oil is supplied to the lock chamber 16, the valve case 15 is moved upward against the release spring 18, and the valve case 15 opposes the second valve member 46 against the second closing spring 53. And move it upwards. Next, the upper end of the valve case 15 is inserted into the accommodating hole 58 of the second joint 6, and the second valve surface 49 of the second valve member 46 is separated from the second valve seat 45 of the valve seat member 42. The valve is opened. At the same time, the upper surface of the large diameter portion 23b of the first valve member 23 is brought into contact with the lower surface of the valve seat member 42, so that the first valve surface 27 of the first valve member 23 becomes the first valve of the valve case 15. The valve is opened apart from the seat 21. Therefore, the first supply / discharge passage 7 of the first joint 5 and the second supply / discharge passage 8 of the second joint 6 are communicated with each other.
Finally, as shown in FIG. 3, the valve case 15 is received by the bottom wall of the accommodating hole 58, and the first joint 5 and the second joint 6 are connected.

When switching the coupling device from the connected state of FIG. 2 to the separated state of FIG. 1, first, when the pressure oil is discharged from the lock chamber 16, the release spring 18 moves the valve case 15 downward. Then, the second valve closing spring 53 moves the second valve member 46 downward, and the first valve closing spring 28 moves the first valve member 23 in the valve closing direction. As a result, the first valve surface 27 of the first valve member 23 comes into contact with the first valve seat 21 of the first casing 10 to close the valve, and the second valve surface 49 of the second valve member 46 becomes the valve seat member. The valve is closed by abutting on the second valve seat 45 of 42.
After that, when the movable block 2 is carried upward, the second joint 6 is separated from the first joint 5 as shown in FIG.

The on-off valve device of the above embodiment is superior to the conventional on-off valve devices shown in FIGS. 3D to 3F in the following points.
In the conventional on-off valve device, the thin portion 69 of the tubular valve member 64 is plastically deformed, and the peripheral wall of the mounting groove 67 grips the sealing member 68 to fix the sealing member 68 to the valve member 64. ing. Therefore, if the peripheral wall of the mounting groove 67 does not uniformly press the sealing member 68, the height of the outer peripheral surface of the sealing member 68, the elasticity of the sealing member 68 may be uneven, and the sealing member 68 may be twisted. There is. Further, since the peripheral wall of the mounting groove 67 presses the sealing member 68, it is necessary to strongly push the valve member 64 toward the valve seat 63 against the pressing force when closing the on-off valve device. There is. Further, while the conventional on-off valve device is being switched from the valve closed state of FIG. 3D to the valve opened state of FIG. 3F, as shown in FIG. 3E, the valve seat 63 is composed of the entire tapered inner peripheral surface 62 of the valve case 60. Therefore, the valve member 64 is separated from the protrusion 61 of the valve case 60 in a state where the valve surface 63 is in close contact with the valve seat 63 over a wide area, so that the sealing member 68 can be peeled off from the mounting groove 67. The force to act. Therefore, the sealing member 68 may be worn or damaged, separated from the mounting groove 67, or twisted in the mounting groove 67.
On the other hand, in the on-off valve device of the present embodiment, the O-rings 26 and 48 are uniformly not pressed by the peripheral walls of the mounting grooves 25 and 47 in the mounting grooves 25 and 47 formed in the valve members 23 and 46. It is installed. Further, since the O-rings 26 and 48 are not pressed by the peripheral walls of the mounting grooves 25 and 47, they can be elastically deformed by a small pressing force. That is, the spring constants of the valve closing springs 28 and 53 can be set small, and the springs can be made small. Further, in the on-off valve device of the present embodiment, relief surfaces 20 and 40 are formed adjacent to the valve seats 21 and 45, and the valve members 23 and 46 are axially opposite to the valve surfaces 27 and 49. Spaces 31 and 50 are formed between the outer peripheral surface and the peripheral walls of the mounting grooves 25 and 47. Therefore, even if there is a size variation due to individual differences in the O-rings 26 and 48, the O-rings 26 and 48 can be retracted into the gaps 31 and 50 to absorb the variation. Further, by providing the relief surfaces 20 and 40, the contact area between the valve surfaces 27 and 49 and the valve seats 21 and 45 can be reduced, so that the force for peeling the sealing member 68 from the mounting groove 67 at the time of separation can be reduced. Is hard to work.

Each of the above embodiments can be modified as follows.
In the above embodiment, the on-off valve device is provided in the coupling device, but the present invention is not limited to this, and other valve devices such as a check valve, a pressure reducing valve, and a relief valve may be applied.
The tapered inner peripheral surface and the tapered outer peripheral surface are not limited to being formed in a tapered shape in the axial direction, and may be in a vertical plane.
In addition, it goes without saying that various changes can be made within the range that can be assumed by those skilled in the art.

Claims (2)

A tapered inner peripheral surface (19) formed on the inner peripheral wall of the tubular casing (15) so as to taper toward the axially tip side of the tubular hole.
A relief surface (20) formed so as to be continuous with the proximal end side of the tapered inner peripheral surface (19) in the axial direction, and is formed so as to intersect the tapered inner peripheral surface (19). Face (20) and
A first valve seat (21) formed on the axially proximal end side portion of the tapered inner peripheral surface (19),
A first valve member (23) movably inserted in the tubular hole of the casing (15) in the axial direction, and a first valve member (23).
A tapered outer peripheral surface (24) formed on the outer peripheral wall of the first valve member (23) so as to approach the axial center toward the tip side.
A mounting groove (25) opened in the circumferential direction on the tapered outer peripheral surface (24),
The sealing member (26) mounted in the mounting groove (25) and
A first valve surface (27) formed on the outer peripheral wall of the sealing member (26) and capable of contacting the first valve seat (21).
The sealing member (26) is provided with a gap (31) formed between the outer peripheral surface on the proximal end side in the axial direction and the inner peripheral surface on the proximal end side in the axial direction of the mounting groove (25). ,
An on-off valve device characterized by this. A mounting hole (41) formed in the casing (40) and
A valve seat member (42) projecting from the bottom wall of the mounting hole (41) toward the tip side in the axial direction of the mounting hole (41),
A tapered outer peripheral surface (43) formed on the valve seat member (42) in the circumferential direction so as to taper toward the base end side.
A relief surface (44) that is formed so as to be continuous with the base end side of the tapered outer peripheral surface (43) in the axial direction and intersects the tapered outer peripheral surface 43.
A second valve seat (45) formed in the circumferential direction on the axially proximal side of the tapered outer peripheral surface (43),
A tubular second valve member (46) that is movably inserted into the mounting hole (41) in the axial direction.
A tapered inner peripheral surface (46a) formed on the inner peripheral wall of the second valve member (46) so as to taper toward the proximal end side in the axial direction, and a tapered inner peripheral surface (46a) in the circumferential direction. A sealing member (48) mounted in the mounted groove (47) to be opened, and
A second valve surface (49) formed on the outer peripheral wall of the sealing member (48) in the circumferential direction and capable of contacting the second valve seat (45).
A gap (50) formed between the axially proximal outer peripheral surface of the sealing member (48) and the proximal inner peripheral surface of the mounting groove (47) is provided.
An on-off valve device characterized by this.

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