JP3676727B2 - On-off valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an on-off valve used by being incorporated in various hydraulic circuits or pneumatic circuits.
[0002]
[Prior art]
As one of the on-off valves, a poppet valve body having a seat part that can be seated on and separated from the valve seat, and a small-diameter hole and a large-diameter hole are continuously provided in the valve body via a valve seat. The large diameter hole is slidably inserted, and the seat portion is seated on the valve seat so that the communication between the small diameter hole and the large diameter hole is blocked, and the seat portion is separated from the valve seat. Thus, there is an arrangement in which an opening having an area that increases according to the amount of seating is formed between the seating portion and the valve seat so that the small diameter hole and the large diameter hole communicate with each other. -274555.
[0003]
[Problems to be solved by the invention]
In the on-off valve disclosed in Japanese Patent Application Laid-Open No. 2000-274555, the seat portion of the poppet valve body is formed in a conical shape, and the valve seat of the valve body is formed in a stepped cylindrical shape (stepped hole shape). The cone-shaped seating portion is separated from the stepped cylindrical valve seat so that the fluid can flow through an opening formed between the seating portion and the valve seat.
[0004]
For this reason, in the on-off valve, when the cone angle in the conical seating portion is set to a large value, for example, about 30 degrees, the seating amount from the valve seat of the seating portion (the amount of movement of the poppet valve body) ) Is large, the flow rate of the fluid flowing through the opening suddenly increases at the beginning of the opening operation of the on-off valve (the opening area is initially increased), and the opening formed between the seat and the valve seat is large. There is a risk that noise may be generated due to the instantaneous flow of fluid.
[0005]
Such a problem is that the cone angle in the conical seating portion is set to a small value of about 17 degrees, for example, and the increase amount of the opening area with respect to the seating amount (the amount of movement of the poppet valve body) from the valve seat of the seating portion is set. Although it can be eliminated by reducing the size, in this case, when the conical seating portion is seated on the stepped columnar valve seat, it is easy to bite in and it is difficult to separate, and a good opening operation can be obtained. There is a risk that it will not be possible.
[0006]
[Means for Solving the Problems]
The present invention has been made to cope with the above-described problems (contradictory problems). A small-diameter hole and a large-diameter hole are continuously provided in the valve body via a valve seat, and the valve seat is A poppet valve body having a seating portion that can be seated / separated is slidably inserted into the large-diameter hole, and the seating portion is seated on the valve seat so that the small-diameter hole communicates with the large-diameter hole. When the seating part is separated from the valve seat, an opening is formed between the seating part and the valve seat so that the area increases according to the amount of seating. In the on-off valve configured to communicate, an intermediate diameter hole is formed at the valve seat side end of the small diameter hole, the valve seat is formed between the medium diameter hole and the large diameter hole, and the medium diameter The poppet valve body inserted from the hole to the small diameter hole is inserted into the small diameter hole with a predetermined small gap. A conical movable valve portion is formed, and the movable valve portion and the small-diameter hole and the medium-diameter hole allow the seating portion to be separated from the valve seat in the initial increase in the area of the opening. The variable aperture is characterized in that the aperture area sequentially increases at a gentler gradient than the area increase gradient of the aperture .
[0007]
[Operation and effect of the invention]
In the on-off valve according to the present invention, the cone-shaped angle is set to a predetermined value (for example, the cone angle is set so that the cone-shaped seat or valve seat and the stepped columnar valve seat or seat are difficult to bite when seated. on which a large value) of about 30 degrees, the variable throttle configured as described above, can win the flow rate of the fluid flowing through the opening in the area increase the initial opening formed in the seating portion and the valve seats Tadashi Is possible. Therefore, it is possible to prevent the seat portion from biting into the valve seat and obtain a favorable opening operation, and the flow rate of the fluid flowing through the opening in the initial increase in the area of the opening formed between the seat portion and the valve seat Can be suppressed, and generation of noise due to a momentary flow of a large amount of fluid through the opening between the seat portion and the valve seat can be suppressed.
[0008]
Further, the variable throttle of the on-off valve according to the invention, it is possible to configure by effectively utilizing the valve body and the poppet valve body is an existing member of the on-off valve can be configured simply and inexpensively. The variable throttle is in the area increases the initial opening formed in the seating portion and the valve seats, because the opening area is you increase sequentially in accordance with the unseated amount from the valve seat of the seating unit, the seating of the poppet valve body During the opening operation in which the part is separated from the valve seat of the valve body, it is possible to suppress abnormal pressure increase (generation of surge pressure) on the pressure side.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a hydraulic circuit of a damping hydraulic damper incorporating the on-off valves A and B according to the present invention. This damping hydraulic damper is, for example, a cylinder attached to a damping object or a base in a building. 11, a piston rod 13 that penetrates the cylinder 11 in a liquid-tight manner and is capable of reciprocating in the axial direction, and is attached to the base or the object to be damped, and is provided integrally with the piston rod 13 in the cylinder 11. A first working chamber 15 and a second working chamber 17 are formed in the cylinder 11, and a piston 19 that reciprocates together with the piston rod 13 is provided.
[0010]
The damping hydraulic damper includes a pair of pilot-operated on / off valves A and B that control the flow of the hydraulic oil between the two working chambers 15 and 17. A pair of check valves 21, 23, a pair of throttles 25, 27, a pair of relief valves 29, 31, an accumulator 33, a throttle 35, and a disconnection release valve 37 that control the flow of hydraulic oil between the working chambers 15, 17. And.
[0011]
Each check valve 21, 23 is provided in parallel to each throttle 25, 27, allows the hydraulic oil to flow from the accumulator 33 to each working chamber 15, 17, and from each working chamber 15, 17 to the accumulator. The flow of hydraulic oil to 33 is prevented. Each of the throttles 25 and 27 is configured to restrict and permit the flow of hydraulic oil (flow toward the accumulator 33).
[0012]
The relief valves 29 and 31 are provided in series with the throttles 25 and 27, and control the flow of hydraulic oil between the working chambers 15 and 17, so that the speed is controlled when the vibration exceeds a predetermined speed. It is for the purpose of obtaining a substantially constant damping force that is almost unrelated to each other, and has the same configuration except that they are provided in opposite directions to each other. It is made to flow (escape) toward the accumulator 33. In a region where the relief valves 29 and 31 do not perform the relief operation, the flow of hydraulic oil between the working chambers 15 and 17 is controlled by the pilot operated on-off valves A and B, so that the speed of the building swings. Corresponding damping force is obtained.
[0013]
The disconnecting valve 37 is an electromagnetic on / off valve that functions in the event of a power outage such as a power failure (when power is abnormal), and is provided in parallel with the pilot operated on / off valves A and B. The solenoid is energized and is in a closed state, and the communication between both working chambers 15 and 17 of the cylinder 11 is cut off. Further, when power is cut off, such as a power failure, the solenoid is de-energized by de-energization and opens, and the working chambers 15 and 17 of the cylinder 11 communicate with each other via the throttle 35.
[0014]
The pilot operated on-off valves A and B have the same configuration except that they are provided in opposite directions, and control the flow of hydraulic oil between the working chambers 15 and 17 to generate a damping force. As shown in FIGS. 1, 2, and 3, a valve body 47 constituted by a block 41, a sleeve 43, a plug 45, etc. The poppet valve body 51, the fixed throttle 52, the variable throttle valve 53 and the electromagnetically operated pilot valve 55 which are the main valve bodies, the throttle 61 assembled to the poppet valve body 51, and the first and second check valves 63, 65 It has.
[0015]
The block 41 of the valve main body 47 has a main flow path 71 connected to the first working chamber 15, a main flow path 73 connected to the second working chamber 17, and a pilot flow path 75. As shown in FIG. 3, the sleeve 43 of the valve body 47 is formed by connecting a small diameter hole 77 communicating with the main flow path 71 and a large diameter hole 79 communicating with the main flow path 73 via a valve seat 81. Therefore, the plug 45 and the block 41 are assembled in a liquid-tight manner. In addition, the small-diameter hole 77 of the sleeve 43 is formed with a medium-diameter hole 85 that constitutes a variable throttle C by a conical movable valve portion 83 formed integrally with the distal end portion of the poppet valve body 51.
[0016]
The poppet valve body 51 has the above-described movable valve portion 83 and a conical seat portion 87 that can be seated on and separated from the valve seat 81, and is slidable in the axial direction in the large-diameter hole 79. It is inserted. The movable valve portion 83 is formed in a conical shape with a conical angle of about 15 degrees, and is inserted into the small diameter hole 77 of the sleeve 43 with a predetermined small gap in the state shown in FIG. The seat portion 87 is formed in a conical shape with a cone angle of about 30 degrees, and is seated on the valve seat 81 in the state shown in FIG.
[0017]
Further, the poppet valve body 51 is inserted into the large-diameter hole 79 so as to be slidable in the axial direction, so that a working chamber 88 communicating with the pilot flow path 75 is defined in the back portion and accommodated in the working chamber 88. The spring 89 is biased toward the valve seat 81. The spring 89 is engaged with the adjustment screw 92 via the retainer 91, and the spring force can be adjusted by loosening the lock nut 93 and moving the adjustment screw 92 forward and backward with respect to the plug 45.
[0018]
The variable throttle C is an opening formed between the seating portion 87 and the valve seat 81 of the poppet valve body 51 (the seating portion 87 is separated from the valve seat 81 so that it is formed between the seating portion 87 and the valve seat 81 and separated. The flow rate regulating means for regulating the flow rate of the hydraulic fluid flowing through the opening at the initial stage of the area increase (when the poppet valve body 51 moves from the state shown in FIG. 3 to the state shown in FIG. 4). , and the is composed of a movable valve part 83 of the small-diameter hole 77 and the medium-diameter hole 8 5 and poppet 51 of the sleeve 43.
[0019]
Further, in the variable throttle C, the area S1 of the opening formed between the movable valve portion 83 of the poppet valve body 51 and the small diameter hole 77 and the medium diameter hole 85 of the sleeve 43 is as shown by the solid line in FIG. Depending on the amount of seating 87 disengaged from the valve seat 81 (the amount of movement L against the spring 89 of the poppet valve body 51), it gradually increases gradually from the initial value, although it has a break point in the middle. Yes. On the other hand, the area S2 of the opening formed between the seat 87 and the valve seat 81 of the poppet valve body 51 is abrupt from zero as shown by the phantom line in FIG. It intersects with the area S1 described above at the intersection point X. For this reason, the opening area that substantially functions in accordance with the movement amount L of the poppet valve body 51 is the opening area S2 formed between the seating portion 87 and the valve seat 81 below the intersection X, and is variable above the intersection X. This is the opening area S1 of the stop C.
[0020]
In the change characteristic of the opening area S1 shown in FIG. 7, the characteristic up to the movement amount L1 is obtained by moving the poppet valve body 51 from the position of FIG. 3 to the position of FIG. 4, and the characteristic from the movement amount L1 to L2. Is obtained by moving the poppet valve body 51 from the position of FIG. 4 to the position of FIG. 5, and the characteristics of the movement amounts L2 to L3 are that the poppet valve body 51 is moved from the position of FIG. 5 to the position of FIG. It is obtained by. The break point between the movement amounts L1 and L2 is that the area of the opening formed between the end of the small diameter hole 77 of the sleeve 43 and the movable valve portion 83 of the poppet valve body 51 is the same as that of the intermediate diameter hole 85 of the sleeve 43 and the poppet. It is a point which becomes larger than the area of the opening formed between the movable valve parts 83 of the valve body 51.
[0021]
As shown in FIG. 2, the variable throttle valve 53 includes a valve body 97 that can be moved back and forth by loosening the lock nut 95 and moving the adjustment screw 96 forward and backward, and a pilot between the working chamber 88 and the pilot valve 55. The flow rate when the poppet valve body 51 is opened is adjusted by controlling the flow rate of the hydraulic fluid that is interposed in the flow path 75 and flows from the working chamber 88 to the low pressure side when the pilot valve 55 is opened. It has become.
[0022]
The pilot valve 55 is interposed in the pilot flow path 75 as shown in FIG. 2, and its opening / closing operation is performed by the piston rod 13 that reciprocates integrally with the piston 19 as shown in FIG. Control is performed by a control circuit ECU that outputs a valve opening / closing command signal based on detection signals from a stroke sensor that detects axial movement (displacement) and both pressure sensors that detect hydraulic pressures in both working chambers 15 and 17 of the cylinder 11, respectively. It has come to be.
[0023]
The throttle 61 and the first check valve 63 assembled to the poppet valve body 51 are provided in the poppet valve body 51 and arranged in series in a first connection path 62 that connects the small diameter hole 77 and the working chamber 88. When the pressure in the small diameter hole 77 is higher than the pressure in the large diameter hole 79, the hydraulic oil can flow from the small diameter hole 77 toward the working chamber 88.
[0024]
On the other hand, the second check valve 65 assembled to the poppet valve body 51 is provided in the second connection path 64 provided in the poppet valve body 51 and connecting the large diameter hole 79 and the working chamber 88. When the pressure in the diameter hole 79 is higher than the pressure in the small diameter hole 77, the hydraulic oil can flow from the large diameter hole 79 toward the working chamber 88.
[0025]
In the vibration damping hydraulic damper of the present embodiment configured as described above, when a piston 19 reciprocates in the cylinder 11 due to an external vibration force such as an earthquake or wind during normal use, one of the operations is activated. The pressure of the chamber 15 or 17 rises and hydraulic oil flows from the working chamber toward one of the other working chambers 17 or 15, and oil that connects the two working chambers 15 and 17 with the flow of the hydraulic oil. Damping force is generated by pilot operated on-off valves A and B on the road. For this reason, the damping effect with respect to a vibration is obtained and the shake of a building is reduced.
[0026]
In the damping hydraulic damper of the present embodiment, when the volume of hydraulic oil in both the working chambers 15 and 17 expands due to factors such as an increase in ambient temperature and the pressure rises above a set value, each throttle The hydraulic oil flows toward the accumulator 33 through 25 and 27 and the relief valves 29 and 31. For this reason, it can prevent that the pressure of the hydraulic fluid in both the working chambers 15 and 17 rises abnormally in the non-operating state, and the damper performance can be stably obtained almost without being influenced by the above-described factors. it can.
[0027]
By the way, in the pilot-operated on-off valves A and B employed in the vibration damping damper of this embodiment, the stepped columnar valve seat 81 formed in the conical seating portion 87 and the sleeve 43 in the poppet valve body 51. Is formed between the seating portion 87 and the valve seat 81 of the poppet valve body 51 with the cone-shaped angle set to a predetermined value (for example, a large value such as a cone angle of about 30 degrees). It is possible to regulate the flow rate of the hydraulic oil flowing through the opening at the initial increase in the area of the opening with the variable throttle C.
[0028]
Therefore, it is possible to prevent the seat portion 87 from biting into the valve seat 81 and obtain a favorable opening operation, and at the beginning of the increase in the area S2 of the opening formed between the seat portion 87 and the valve seat 81. It is possible to suppress a sudden increase in the flow rate of the hydraulic fluid flowing through the opening, and to suppress the generation of noise due to a momentary flow of the hydraulic fluid through the opening between the seat portion 87 and the valve seat 81.
[0029]
Further, in the on-off valves A and B of the present embodiment, the flow rate regulation that regulates the flow rate of the hydraulic oil flowing through the opening in the initial increase in the area of the opening formed between the seating portion 87 of the poppet valve body 51 and the valve seat 81. As a means, a variable throttle C constituted by an inner hole (small diameter hole 77 and medium diameter hole 85) formed in the sleeve 43 of the valve body 47 and a movable valve part 83 formed integrally with the poppet valve body 51 is adopted. Since the variable throttle C can be configured by effectively utilizing the sleeve 43 and the poppet valve body 51 of the valve main body 47, which are existing members of the on-off valves A and B, the configuration is simple and inexpensive. be able to.
[0030]
In the on-off valves A and B of the present embodiment, the variable throttle C is constituted by the small diameter hole 77 and the medium diameter hole 85 of the sleeve 43 and the movable valve part 83 of the poppet valve body 51, and the seating part 87. Since the opening area S1 is sequentially increased as shown by the solid line in FIG. 7 according to the amount of seating from the valve seat 81, the seating portion 87 of the poppet valve body 51 is separated from the valve seat 81 of the valve body 47. During the opening operation for separating the seat, it is possible to suppress abnormal pressure increase (generation of surge pressure) in the passage (pressure side) communicating with the small diameter hole 77 of the sleeve 43.
[0031]
In the above embodiment, the seat 87 of the poppet valve body 51 has a conical shape with a predetermined angle, and the valve seat 81 has a stepped columnar shape. However, as shown in FIG. the seating portion 87 with a stepped cylindrical shape, Ru possible der to implement the valve seat 81 as the conical shape of a predetermined angle.
[0032]
In the above embodiment, the present invention is applied to the pilot-operated on-off valves A and B incorporated in the hydraulic circuit of the damping hydraulic damper. However, the present invention is incorporated into various other hydraulic circuits or pneumatic circuits. In addition to the pilot-operated on-off valve, the direct-acting on-off valve can be similarly or appropriately modified.
[Brief description of the drawings]
FIG. 1 is a hydraulic circuit diagram showing an embodiment of a damping hydraulic damper incorporating an on-off valve according to the present invention.
FIG. 2 is a cross-sectional view showing a detailed configuration of the pilot operated on-off valve shown in FIG.
3 is an enlarged cross-sectional view of a portion including the poppet valve body shown in FIG. 2. FIG.
4 is a cross-sectional view showing a state where the poppet valve body shown in FIG. 3 has moved L1 against a spring. FIG.
5 is a cross-sectional view showing a state where the poppet valve body shown in FIG. 3 has moved L2 against a spring. FIG.
6 is a cross-sectional view showing a state in which the poppet valve body shown in FIG. 3 has moved L3 against a spring. FIG.
7 is a characteristic diagram showing the relationship between the amount of movement of the poppet valve body in the pilot operated on-off valve shown in FIGS. 1 to 6 and each of the opening areas S1 and S2. FIG.
8 is a cross-sectional view showing a modified embodiment of the seating portion and the valve seat shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Cylinder, 13 ... Piston rod, 15 ... 1st working chamber, 17 ... 2nd working chamber, 19 ... Piston, A, B ... Pilot operation type on-off valve, 47 ... Valve body, 51 ... Poppet valve body, 71, 73 ... main flow path, 75 ... pilot flow path, 77 ... small diameter hole, 79 ... large diameter hole, 81 ... valve seat, 83 ... movable valve part, 85 ... medium diameter hole, 87 ... seating part, 88 ... working chamber, 89 ... Spring, C... Variable throttle, S1... Area of opening formed between small diameter hole and medium diameter hole and movable valve part, S2... Area of opening formed between seating part and valve seat.

Claims (1)

A small-diameter hole and a large-diameter hole are connected to each other through a valve seat in the valve body, and a poppet valve body having a seating portion that can be seated on and separated from the valve seat is slidable in the large-diameter hole. The seat portion is seated on the valve seat so that communication between the small-diameter hole and the large-diameter hole is blocked, and the seat portion is separated from the valve seat so that the seat portion and the seat In the on-off valve configured such that an opening whose area increases according to the amount of separation between the valve seats is formed so that the small diameter hole communicates with the large diameter hole.
An intermediate diameter hole is formed at the valve seat side end of the small diameter hole, the valve seat is formed between the medium diameter hole and the large diameter hole, and is inserted from the medium diameter hole to the small diameter hole. A conical movable valve portion that is inserted into the small diameter hole with a predetermined small gap is formed at the distal end portion of the poppet valve body. An opening / closing valve comprising a variable throttle in which an opening area sequentially increases at a gentler slope than an area increase gradient of the opening in accordance with an amount of separation of the seating portion from the valve seat at an early stage of area increase .

Images