JP3634412B2 - Fluid control device - Google Patents

Description

[0001]
[Industrial application fields]
In the present invention, a one-way throttle valve that controls the flow in one direction of the fluid while restricting the flow in one direction of the fluid and a pilot operation check valve that opens and closes by a pilot operation are arranged in series. The present invention relates to a fluid control device having a function.
[0002]
[Prior art]
Conventionally, there is such a fluid control apparatus as shown in FIG. In this system, a pilot operation check valve 24 and an electromagnetic switching valve 3 are laminated on a manifold 1, and the electromagnetic switching valve 3 uses two load flow paths A and B connected to a cylinder 4 as a pressure source P. Provided in switching communication between the connected supply flow path P1 and the discharge flow path R connected to the low pressure side T, the pilot operation check valve 24 is provided with valve bodies 24A and 24B in the load flow paths A and B, Each valve body 24A, 24B opens when the fluid flow from the cylinder 4 side to the electromagnetic switching valve 3 side is actuated by the pressure of the pilot fluid flowing through the pilot flow paths 25A, 25B connected to the other load flow path B or A. When the pressure of the pilot fluid does not act, the actuator is closed and prevented, and conversely, the flow from the electromagnetic switching valve 3 side to the cylinder 4 side is provided as a free flow. In addition, one-way throttle valves 26A and 26B are arranged in series with the valve elements 24A and 24B of the pilot operation check valve 24 in the load flow paths A and B, respectively. The flow to the cylinder 4 side is a free flow, the flow from the cylinder 4 side is throttled, and the cylinder 4 is speed controlled by a meter-out circuit.
[0003]
In the state shown in FIG. 5, the electromagnetic switching valve 3 is located in the neutral position, and the pilot operation check valve 24 closes the valve bodies 24A and 24B to block the flow of fluid from the cylinder 4 side. The cylinder 4 is stopped. When the electromagnetic switching valve 3 is switched to the left position in FIG. 5, the load channel A is switched to the supply channel P1, the load channel B is switched to the discharge channel R, and the supply flow from the pressure source P is supplied. The fluid supplied to the path P1 flows through the valve body 24A of the pilot operation check valve 24 and the one-way throttle valve 26A from the load flow path A in a free flow and is introduced into the head chamber 4A of the cylinder 4, and the rod chamber 4B of the cylinder 4 The fluid led out from the discharge passage R is controlled by the one-way throttle valve 26B and is opened by the action of the pressure of the pilot fluid flowing through the pilot passage 25B of the pilot check valve 24. The cylinder 4 operates by controlling the speed in the right direction of FIG. 5 with a meter-out circuit. Further, when the electromagnetic switching valve 3 is switched to the right position in FIG. 5, the cylinder 4 operates by controlling the speed in the left direction in FIG.
[0004]
[Problems to be solved by the invention]
However, in the conventional configuration, the one-way throttle valves 26A and 26B and the pilot operation check valve 24 must be provided separately, and there is a problem that the entire apparatus is increased in size.
The present invention solves such a problem, and a one-way throttle valve for restricting the flow in one direction of the fluid and controlling the flow in the other direction and a pilot operation non-return operation that opens and closes by a pilot operation. The present invention provides a fluid control device in which a function equivalent to that in the case where valves are arranged in series can be obtained with a single valve, and the entire device is reduced in size.
[0005]
[Means for Solving the Problems]
For this reason, the present invention is arranged in series with a one-way throttle valve that restricts the flow in one direction of the fluid and controls the flow in the other direction, and a pilot check valve that opens and closes by a pilot operation. In the fluid control apparatus having the provided function, a first flow in which a small-diameter hole and a large-diameter hole larger in diameter than the small-diameter hole are continuously provided in the valve body, and the fluid circulates through the first valve seat in the small-diameter hole. And a second flow passage through which the fluid flows, and a second valve seat formed on the connecting step portion of the small diameter hole and the large diameter hole. A valve body seated on the valve body is slidably disposed in the large-diameter hole, and a pilot piston that presses the valve body in the direction away from the second valve seat by the action of the pressure of the pilot fluid is opposed to the valve body. provided movably, pilot piston with a gap on the inner circumferential surface in the radial direction of the small-diameter hole rod portion Extending from the valve body and the abutting freely end surface, provided to form a valve portion to be seated on the first valve seat by the pressure of the pilot piston to separating direction of the valve body is tapered at the base of the rod portion, The small-diameter hole and the first flow passage communicate with each other via a throttle hole that controls the fluid in parallel with the communication via the first valve seat , and the throttle hole is provided in the valve body . In this case, the throttle hole may be provided in the pilot piston instead of the valve body.
[0006]
[Action]
In such a configuration of the present invention, when the pressure of the pilot fluid does not act on the pilot piston, when the fluid flows in from the first flow passage, the fluid flows through the first valve seat and the small diameter hole, and the valve body is moved to the second valve seat. When the fluid flows into the second flow path from the large-diameter hole, the valve body is seated on the second valve seat and the second valve seat is opened. The flow to the 1st flow path side is blocked. Further, when the pressure of the pilot fluid acts on the pilot piston, the pilot piston presses the valve body by the action of the pressure of the pilot fluid to separate from the second valve seat, and the valve portion is seated on the first valve seat, The fluid flowing in from the second flow passage flows from the large-diameter hole through the second valve seat and the small-diameter hole, and is controlled by the throttle hole to flow to the first flow passage. For this reason, if the pressure of the pilot fluid is not acting on the pilot piston, the fluid flows freely from the first flow path to the second flow path and prevents the flow of fluid from the second flow path to the first flow path. When the pressure of the pilot fluid acts on the pilot piston, the fluid can be controlled to flow from the second flow passage to the first flow passage, so that the flow in one direction of the fluid is a free flow and the flow in the other direction. A single valve can provide the same function as a one-way throttle valve that controls the flow and a pilot operated check valve that opens and closes by pilot operation. Can be achieved.
[0007]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same location as a prior art example.
In FIG. 1 and FIG. 2, reference numeral 1 denotes a manifold, in which a valve 2 and an electromagnetic switching valve 3 are stacked. The electromagnetic switching valve 3 has two load passages A and B connected to the head chamber 4A and the rod chamber 4B of the cylinder 4, a supply passage P1 connected to the pressure source P, and a discharge passage R connected to the low pressure side T. Are provided in communication with each other.
[0008]
Reference numeral 5 denotes a valve body of the valve 2, which is provided in a rectangular parallelepiped shape so as to be freely stacked on the manifold 1 with the electromagnetic switching valve 3, and vertically passes through the supply flow path P1 and the discharge flow path R in the vertical direction. Opening is provided on the end surfaces 5A and 5B, and the first flow passages 6A and 6B through which fluid flows are connected to the load flow paths A and B on the electromagnetic switching valve 3 side on the upper end surface 5A, and the lower end surface 5B. The second flow passages 7A and 7B through which fluid flows are connected to the load flow paths A and B on the manifold 1 side. Reference numeral 8 denotes a through hole, which is provided through the valve body 5 so as to open on both side surfaces 5C and 5D orthogonal to the upper and lower end surfaces 5A and 5B. The first flow passages 6A and 6B and the second flow passage 7A are provided in the through hole 8. , 7B are provided to be opened with a gap in the axial direction.
[0009]
9A and 9B are cylindrical sleeve members, which are provided by being inserted into the through-hole 8 from the openings of both side surfaces 5C and 5D, respectively, and lid members 20A for detachably closing the openings of the both side surfaces 5C and 5D of the through-hole 8; A part of the valve body 5 is configured by being fixedly positioned in the axial direction by 20B. The sleeve members 9A and 9B are provided with small-diameter holes 10A and 10B and large-diameter holes 11A and 11B having a larger diameter than the small-diameter holes 10A and 10B, penetrating in the axial direction and opening at both end faces. The small-diameter holes 10A and 10B are provided in communication with the first flow passages 6A and 6B from the openings on the one end surfaces of the sleeve members 9A and 9B, and the large-diameter holes 11A and 11B flow in the radial direction in the sleeve members 9A and 9B. It communicates with the second flow passages 7A and 7B via the passages 12A and 12B.
[0010]
13A and 13B are 1st valve seats, and are formed and formed in the opening ridge part to sleeve member 9A, 9B one end surface of small diameter hole 10A, 10B. Reference numerals 14A and 14B denote second valve seats which are formed and provided at the stepped portions of the small diameter holes 10A and 10B and the large diameter holes 11A and 11B. 15A and 15B are valve bodies, which are movably accommodated in the large-diameter holes 11A and 11B and are seated on the second valve seats 14A and 14B. Reference numerals 16A and 16B denote springs, which are accommodated on the back portions of the valve bodies 15A and 15B, and are provided by energizing the valve bodies 15A and 15B in the seating direction on the second valve seats 14A and 14B. A pilot piston 17 is provided so as to be movable in the axial direction center of the through-hole 8. Rod portions 17A and 17B are provided so as to project from both end faces thereof. The rod portions 17A and 17B have small-diameter holes 10A and 10B. The end portions of the rod portions 17A and 17B extend so as to be in contact with the head portions of the valve bodies 15A and 15B so as to be in contact with the inner peripheral surface with a gap in the radial direction.
[0011]
The pilot piston 17 is provided by forming tapered valve portions 18A and 18B at the bases of the rod portions 17A and 17B, and the fluid flowing through the first flow passage 6A or 6B acts as a pilot fluid and this pressure acts on the end face. The valve body 15B or 15A is moved in the right or left direction in FIG. 2 to press the valve body 15B or 15A away from the second valve seat 14B or 14A, and the valve portion 18B or 18A is seated on the first valve seat 13B or 13A. It is provided freely. Reference numerals 19A and 19B are throttle holes for restricting the fluid. The small diameter holes 10A and 10B and the first flow passages 6A and 6B are connected to the sleeve members 9A and 9B in parallel with the communication via the first valve seats 13A and 13B. It is drilled in the radial direction.
[0012]
Next, the operation of this configuration will be described.
1 and 2 show a stopped state of the cylinder 4, the electromagnetic switching valve 3 is located at the neutral position, connects the load flow paths A and B to the discharge flow path R, and shuts off the supply flow path P1, and the valve 2 The valve bodies 15A and 15B are seated on the second valve seats 14A and 14B by the forces of the springs 16A and 16B to prevent the flow of fluid from the cylinder 4 side to the electromagnetic switching valve 3 side, and the cylinder 4 is stopped at the left end. .
[0013]
When the electromagnetic switching valve 3 is switched to the left position from the state of FIG. 1, the load flow path A is switched to the supply flow path P1 and the load flow path B is switched to the discharge flow path R. The fluid supplied from the pressure source P to the supply flow path P1 flows from the load flow path A through the first flow passage 6A of the valve 2 as shown in FIG. On the other hand, it is separated from the second valve seat 14A and flows in the second flow passage 7A in a free flow and is introduced into the head chamber 4A of the cylinder 4. The fluid flowing through the first flow passage 6A acts as a pilot fluid on the end surface of the pilot piston 17 where the rod portion 17A protrudes, and the pilot piston 17 moves rightward due to the pressure of the pilot fluid and moves into the rod portion. 17B comes into contact with the head of the valve body 15B, presses the valve body 15B against the force of the spring 16B to separate from the second valve seat 14B, and the valve portion 18B sits on the first valve seat 13B. The fluid led out from the rod chamber 4B of the cylinder 4 to the load flow path B is controlled by the throttle hole 19B from the second flow path 7B, flows through the first flow path 6B, and is discharged from the discharge flow path R to the low pressure side T. The cylinder 4 operates by controlling the speed with a meter-out circuit in the right direction in FIG.
[0014]
When the cylinder 4 operates to the right end of FIG. 1, the electromagnetic switching valve 3 is returned to the neutral position. Thereby, the first flow passages 6A and 6B are switched and communicated from the load flow passages A and B to the discharge flow passage R, the pilot fluid does not act on the pilot piston 17, and the valve bodies 15A and 15B are moved by the springs 16A and 16B. While being seated on the second valve seats 14A and 14B, the pilot piston 17 is moved to the left in FIG. 3 by the force of the spring 16B, and the valve portion 18B is separated from the first valve seat 13B. The cylinder 4 stops at the right end.
[0015]
When the electromagnetic switching valve 3 is switched to the right position from this state, the load channel A is switched to the discharge channel R and the load channel B is switched to the supply channel P1. The fluid in the supply flow path P1 flows through the load flow path B, leaves the valve body 15B away from the second valve seat 14B, flows in a free flow into the second flow passage 7B, and is introduced into the rod chamber 4B of the cylinder 4. The pilot piston 17 acts as a pilot fluid when the fluid flowing through the first flow passage 6B moves to the left in FIG. 2 in the opposite direction to separate the valve body 15A from the second valve seat 14A. The portion 18A is seated on the first valve seat 13A. The fluid led out from the head chamber 4A of the cylinder 4 is controlled by the throttle hole 19A from the second flow passage 7A and flows through the first flow passage 6A and is discharged to the low pressure side T from the discharge flow path R. The cylinder 4 is discharged from the right end. It operates by controlling the speed with a meter-out circuit to the left in FIG. When the cylinder 4 operates to the left end, the electromagnetic switching valve 3 is returned to the neutral position, the valve 2 is seated on the second valve seats 14A and 14B, and the pilot piston 17 is moved rightward. The valve portion 18A moves to separate from the first valve seat 13A. The cylinder 4 stops at the left end shown in FIG.
[0016]
With this operation, when the pilot fluid is not acting on the pilot piston 17, the valve body 15A, 15B is seated on the second valve seats 14A, 14B and the first flow from the second flow passages 7A, 7B. The flow of the fluid to the passages 6A and 6B is blocked, and when the pilot fluid acts on the pilot piston 17, the valve body 15A or 15B is separated from the second valve seat 14A or 14B, and the valve portion 18A or 18B is moved. The conventional apparatus shown in FIG. 5 is used for sitting on the first valve seat 13A or 13B and controlling the fluid from the second flow passage 7A or 7B through the restriction hole 19A or 19B to flow into the first flow passage 6A or 6B. A single valve 2 can provide the same function as when the one-way throttle valves 26A and 26B and the pilot check valve 24 are arranged in series in the load channels A and B. And it is, it is possible to miniaturize the entire apparatus. Further, the valve 2 may be provided by forming the valve portions 18A and 18B on the pilot piston 17, and may be the valve bodies 15A and 15B and the pilot piston 17 as members that move, and the member that moves as compared with the existing pilot operation check valve. The increase in the complexity of the configuration can be satisfactorily suppressed. Furthermore, the opening degree of the throttle can be changed as appropriate by removing the lid members 20A and 20B and replacing the sleeve members 9A and 9B with different diameters of the throttle holes 19A and 19B.
[0017]
FIG. 4 shows another embodiment of the present invention. The same reference numerals are given to the same portions as those of the first embodiment, the description thereof is omitted, and only different portions will be described.
The throttle holes 21A and 21B for throttle-controlling the fluid open one end of the pilot piston 22 to the outer peripheral surface of the rod portions 22A and 22B extending into the small diameter holes 10A and 10B, and the other end of the valve portions 23A and 23B. An opening is always provided at the base facing the first flow passages 6A and 6B, and the small-diameter holes 10A and 10B and the first flow passages 6A and 6B are communicated in parallel with the communication through the first valve seats 13A and 13B. . And, by the same operation as that of the embodiment, it is possible to reduce the size of the entire apparatus similarly to the embodiment, and the valve 2 can satisfactorily suppress the complication of the configuration.
[0018]
In this embodiment, two valve bodies 15A and 15B are provided corresponding to the load flow paths A and B, and the speed is controlled by the meter-out circuit when the cylinder 4 is operated in the right direction and the left direction. Of course, when the speed control is performed only for the operation in the direction by the meter-out circuit, it is of course necessary to provide one valve element corresponding to the required load flow path A or B.
[0019]
【The invention's effect】
As described above, the present invention provides a series of a one-way throttle valve for controlling the flow in one direction of the fluid to be a free flow and controlling the flow in the other direction, and a pilot operation check valve that opens and closes by a pilot operation. In the fluid control device having the function disposed in the valve body, a small-diameter hole and a large-diameter hole larger in diameter than the small-diameter hole are continuously provided in the valve body, and fluid flows through the small-diameter hole via the first valve seat. The second flow passage is provided in communication with the first flow passage and the fluid is circulated in the large-diameter hole, and the second valve seat is provided in the continuous step portion of the small-diameter hole and the large-diameter hole. A valve body seated on the valve seat is slidably disposed in the large-diameter hole, and a pilot piston that presses the valve body in the direction away from the second valve seat by the action of the pressure of the pilot fluid faces the valve body. and provided movably, pilot piston Rotsu with a gap on the inner circumferential surface in the radial direction of the small diameter hole Parts extending from the valve body and the abutting freely end surface and to form a valve portion to be seated on the first valve seat by the pressure of the pilot piston to separating direction of the valve body is tapered at the base of the rod portion The small-diameter hole and the first flow passage are communicated by a throttle hole that controls the fluid in parallel with the communication through the first valve seat , and the throttle hole is provided in the valve body or the pilot piston, so that one direction of the fluid A one-way throttle valve that throttles and controls the flow in the other direction and a pilot operation check valve that opens and closes by pilot operation are provided in a single function. It can be obtained with a valve, and the overall size of the apparatus can be reduced.
Also, the valve is provided with a tapered valve at the base of the rod part of the pilot piston, and the valve body and pilot piston may be used as the moving member, and the number of moving members is increased compared to existing pilot operation check valves. This has the effect that the complication of the configuration can be satisfactorily suppressed.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a fluid control apparatus showing an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a valve showing the main part of one embodiment.
FIG. 3 is a longitudinal sectional view showing the operating state of FIG. 2;
FIG. 4 is a longitudinal sectional view of a valve showing another embodiment.
FIG. 5 is a circuit diagram of a fluid control apparatus showing a conventional example.
[Explanation of symbols]
2 valve 5 valve body 6A, 6B first flow passage 7A, 7B second flow passage 10A, 10B small diameter hole 11A, 11B large diameter hole 13A, 13B first valve seat 14A, 14B second valve seat 15A, 15B valve body 17 , 22 Pilot piston 18A, 18B, 23A, 23B Valve portion 19A, 19B, 21A, 21B Restriction hole

Claims (2)

A one-way throttle valve that restricts the flow in one direction of the fluid to a free flow and controls the flow in the other direction and a pilot operation check valve that opens and closes by a pilot operation are provided in series. In the fluid control device, a small-diameter hole and a large-diameter hole larger in diameter than the small-diameter hole are continuously provided in the valve body, and the small-diameter hole communicates with a first flow passage through which fluid flows through the first valve seat. A second flow passage through which a fluid flows is provided in communication with the diameter hole, a second valve seat is formed in a connecting step portion of the small diameter hole and the large diameter hole, and a valve body seated on the second valve seat is provided. provided accommodated movably to the large-diameter hole, the valve body by the action of the pressure of pilot fluid opposite to the valve body pilot piston for pressing the separating direction from the second valve seat is provided movably, pilot The piston has a gap in the radial direction with the inner peripheral surface of the small-diameter hole so that the rod part can be in contact with the valve body. Extending from the surface, the pilot piston is provided to form a valve portion to be seated on the first valve seat by the pressure in the separating direction of the valve body is tapered at the base of the rod portion, the small diameter hole and the first flow path A fluid control device in which a throttle hole is provided in a valve main body in communication with a throttle hole that controls the fluid in parallel with the communication via the first valve seat. A one-way throttle valve that restricts the flow in one direction of the fluid to a free flow and controls the flow in the other direction and a pilot operation check valve that opens and closes by a pilot operation are provided in series. In the fluid control device, a small-diameter hole and a large-diameter hole larger in diameter than the small-diameter hole are continuously provided in the valve body, and the small-diameter hole communicates with a first flow passage through which fluid flows through the first valve seat. A second flow passage through which a fluid flows is provided in communication with the diameter hole, a second valve seat is formed in a connecting step portion of the small diameter hole and the large diameter hole, and a valve body seated on the second valve seat is provided. A pilot piston that presses the valve body in the direction of separation from the second valve seat by the action of the pressure of the pilot fluid is provided so as to be movable in the large-diameter hole. The piston has a gap in the radial direction with the inner peripheral surface of the small-diameter hole so that the rod part can be in contact with the valve body. The pilot piston extends from the surface and is provided with a valve portion that is seated on the first valve seat by pressing the valve body in the seating direction in a tapered shape at the base of the rod portion, and has a small diameter hole and a first flow passage A fluid control device in which a throttle hole is provided in a pilot piston, and communicated with a throttle hole that controls the fluid in parallel with the communication via the first valve seat .

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