JP5265847B2 - Moving throttle valve, fluid pressure state maintaining system, fluid pressure seismic isolation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a moving throttle valve capable of preventing the blockage of a circular clearance by dust in working fluid with a simple constitution. <P>SOLUTION: In this throttle valve 5 used in a fluid pressure circuit and comprising a throttle valve passage 1 as a circular pipe conduit through which the working fluid passes, and a throttle valve element 2 received in the valve passage 1 and limiting a flow rate of the working fluid by the circular clearance &mu; between its outer diameter and an inner diameter of the valve passage 1, and the throttle valve element 2 is movable in the throttle valve passage 1. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to a moving throttle valve that is used in a fluid pressure circuit and restricts the flow rate of a working fluid by an annular gap, and a fluid pressure state holding system that includes the moving throttle valve and holds a load device such as a lock cylinder in a constant state. The present invention relates to a fluid pressure isolation system equipped with a moving throttle valve.

  In a hydraulic circuit which is an example of a fluid pressure circuit, there is a throttle valve (sometimes referred to as “orifice” as a general term) that restricts the flow rate of a working fluid flowing through a pipeline, and the flow rate is particularly small. When it is desired to limit the throttle valve, a throttle valve with an annular gap is used. In general, such a throttle valve is fixed so that the valve body does not move.

  For example, in the accumulator structure described in Patent Document 1, an annular clearance throttle valve is used as a control means in a pipe line connecting a pipe line between a hydraulic pump and a hydraulic actuator to the accumulator. The throttle valve was not intended to move.

  On the other hand, the throttle valve in the annular gap is a hydraulic state holding system that keeps a load device such as a lock cylinder in a constant state. In the case of a single rod cylinder, if the pressure in the oil chamber rises due to the difference in pressure receiving area between the rod side oil chamber and the bottom side oil chamber, the piston is prevented from moving to the rod side. In order to prevent this, it is used for temperature compensation that permits the flow of a very small amount of the working fluid while maintaining the holding state. However, in this case as well, no throttle valve is movable.

  Furthermore, in recent years, various hydraulic seismic isolation systems such as those described in Patent Document 2 have been proposed. Among them, unlike this Patent Document 2, the seismic isolation system is always used so that the seismic isolation function does not work. Although the cylinder for use is locked and a throttle valve with an annular gap can be used for temperature compensation in this locked state, it has not been assumed that the throttle valve can be moved in this case as well.

  However, in a throttle valve with an annular gap that allows a very small flow rate, minute dust in the working fluid accumulates in an annular shape at the entrance of the annular gap while it is being used for a long period of time. In some cases, the gap may be blocked, the temperature compensation function may not be exhibited, the hydraulic actuator used may be destroyed, and the working fluid may be leaked, and the function may not be exhibited.

  This problem has been an important solution for a hydraulic seismic isolation system that has been used for a span of several years to several decades, but is required to function reliably in the event of an earthquake.

  For this reason, some hydraulic seismic isolation systems do not provide such a throttle valve and allow the flow of the working fluid in the lock line periodically for a short period of time to replace temperature compensation. It was troublesome to maintain.

In addition, the above-mentioned problems are common to fluid pressure circuits that use water or the like as a working fluid, fluid pressure state maintaining systems, and fluid pressure isolation systems.
JP-A-11-230101 (reference numerals 5 and O in FIGS. 1 and 2) Japanese Patent Laid-Open No. 11-270184 (FIGS. 1 and 2)

  The present invention is intended to improve the above-mentioned problem, and has a simple structure, but can prevent the annular gap from being blocked by dust in the working fluid, and a fluid pressure state maintaining system using the same It aims to provide a fluid pressure isolation system.

The moving throttle valve of the present invention is used in a fluid pressure circuit, and is a throttle valve path that is a circular pipe through which a working fluid passes, and is accommodated in the valve path, and has an annular shape between the outer diameter and the inner diameter of the valve path. a throttle valve comprising a cylindrical throttle valve body for limiting the flow rate of the working fluid by a gap, the throttle valve body, which has a body forming the annular gap between the throttle valve passage, It can be moved in the throttle valve path by the pressure on the throttle valve,
Portion for housing the body of the throttle valve passage, or, in the portion to be outside the part component for housing the body of the throttle valve passage, conduit for releasing expanded working fluid as the temperature rise of the fluid pressure circuit An opening is provided, and at least one of both ends of the main body is located in the throttle valve path within a range of movement of the throttle valve body in the throttle valve path .

  The working fluid in the present invention includes a fluid that can be used as a pressure-mediated fluid such as water in addition to the working oil used in a general hydraulic circuit, and when the working oil is used as the working fluid, the present invention Fields where the movable throttle valve is used are hydraulic circuits, hydraulic state maintaining systems, and hydraulic seismic isolation systems.

  The fluid pressure state maintaining system of the present invention is characterized by including a moving throttle valve having such characteristics.

  The fluid pressure seismic isolation system of the present invention includes a moving throttle valve having such characteristics.

According to the moving throttle valve of the present invention, a throttle valve path which is used in a fluid pressure circuit and becomes a circular pipe through which a working fluid passes, and is accommodated in the valve path, its outer diameter and inner diameter of the valve path A throttle valve body that restricts the flow rate of the working fluid by the annular clearance, the throttle valve body having a main body that forms the annular clearance with the throttle valve passage Along with the throttle valve, it is movable in the throttle valve path by the pressure reaching the throttle valve,
Portion for housing the body of the throttle valve passage, or, in the portion to be outside the part component for housing the body of the throttle valve passage, conduit for releasing expanded working fluid as the temperature rise of the fluid pressure circuit In the range of movement of the throttle valve body in the throttle valve path, at least one of both ends of the main body is located in the throttle valve path, so that the configuration is simple. However, the annular gap can be prevented from being blocked by dust in the working fluid.

  Further, when used for temperature compensation, the function of the annular gap is exhibited for a long period of time, so that it is possible to prevent the associated hydraulic device from being destroyed during this period.

  According to the fluid pressure state maintaining system of the present invention, since the movable throttle valve having such a characteristic is provided, the effect of the movable throttle valve is exhibited as the system.

  Moreover, according to the fluid pressure isolation system of the present invention, since the movable throttle valve having such a feature is provided, the effect of the movable throttle valve is exhibited as the system.

  Hereinafter, embodiments (examples) of the present invention will be described with reference to the drawings.

  1A is a transverse sectional view showing an example of a moving throttle valve of the present invention, FIG. 1B is a longitudinal sectional view thereof, and FIG. 1C is a hydraulic state provided with the movable throttle valves of FIGS. Hydraulic circuit diagrams showing an example of the holding system, (d) and (e) are conceptual diagrams illustrating the function of the movable throttle valve of the present invention.

  As an application field of the moving throttle valve of the present invention, a hydraulic circuit using hydraulic oil as a working fluid, a hydraulic state maintaining system, and a hydraulic seismic isolation system will be described. However, the moving throttle valve of the present invention is not limited to this. The present invention is applicable to general fluid pressure circuits, fluid pressure state maintaining systems, and fluid pressure seismic isolation systems.

  The movable throttle valve 5 shown in FIGS. 1A and 1B is accommodated in a housing P serving as a valve accommodating portion according to the situation of the installation portion. The housing P is in oil-tight contact with the housing Q provided with the hydraulic pipe line Qa using the moving throttle valve 5 by an O-ring Pc, and is fixed by a mounting hole Pa.

  The moving throttle valve 5 is accommodated in the throttle valve path 1 which is a circular pipe through which the working fluid passes, and an annular gap μ between the outer diameter and the inner diameter of the valve path 1 (FIG. 1D). , (E), and a throttle valve body 2 that restricts the flow rate of the working fluid. The throttle valve body 2 is movable in the throttle valve path 1.

  The movable throttle valve 5 also includes a stopper 3 that prevents the throttle valve body 2 from coming out of the throttle valve passage 1.

  In this example, the throttle valve passage 1 is provided as a central portion of a lateral hole that penetrates the housing P, and the stopper 3 is an opening hole having a larger inner diameter on both sides of the throttle valve passage 1, that is, an oil passage described below. It also functions as a plug that seals the portion 1b using screw means.

  An O-ring 3 a is fitted under the neck of the stopper 3 to ensure oil tightness when sealed with the stopper 3.

Total bar-like throttle valve body 2, on both ends of the main body 2c that forms a predetermined annular gap μ between the throttle valve passage 1, comprising a small-diameter both end small diameter portion 2b than the outer diameter of the main body 2c, the two ends The throttle valve passage 1 corresponding to the small-diameter portion 2b is a larger-diameter oil passage portion 1b ( a portion outside the portion accommodating the throttle valve body 2 (exactly the main body 2c) ), and is continuous with this. And it is the internal thread part 1c in which the stopper 3 is screwed together.

The small diameter portions 2b at both ends of the main body 2c of the throttle valve body 2 are not essential.

  The left and right oil passages 1b are each provided with an opening 1d that communicates with the hydraulic line Qa of the housing Q to allow the working fluid to flow therethrough.

The throttle valve body 2 has a main body small diameter portion 2a in which a part of the main body 2c of the throttle valve body 2 (in this example, a central portion) has a smaller outer diameter. An opening 1a to the hydraulic line Qa of the housing Q ( an opening provided in a portion that accommodates the main body 2c of the throttle valve path 1 ) is provided at a position corresponding to the main body small-diameter portion 2a to allow the working fluid to flow. Yes.

  The moving throttle valve 5 having such a configuration is provided in a hydraulic pressure maintaining system 10 as shown in FIG.

  In this system 10, each of a rod side oil chamber R (A) and a bottom side oil chamber R (B) of a hydraulic cylinder OA that is a hydraulic actuator is connected to a hydraulic tank OT, and a hydraulic tank OT is connected to each of the hydraulic lines. Is provided with an on-off valve SV for connecting / disconnecting the flow of the working fluid to the oil chambers R (A) and R (B).

  As already described above, the reference numeral “(A)” is used for the rod-side oil chamber R (A) of the hydraulic actuator OA, and the reference numeral “(A)” is used for the bottom-side oil chamber R (B). The reference “(B)” may be distinguished by attaching the reference “(T)” to those relating to the hydraulic tank OT.

  The movable throttle valve 5 is configured to transfer the working fluid in the pipes Qa (A) and Qa (B) on the hydraulic cylinder OA side from the on-off valves SV of the respective hydraulic pipes to the pipe Qa (T ).

These pipes Qa (A), Qa (B), and Qa (T) have openings 1d (A), 1d (B), and 1a (T) of the movable throttle valve 5 as shown in FIG. 1 (b). Is connected.

  The hydraulic state holding system 10 including the movable throttle valve 5 loads the load device W on the output side without being subjected to state holding, and the rod side oil chamber R (A) and the bottom side oil chamber R (B). The outflow of the working fluid is blocked by the on-off valve SV, and the state of the piston in FIG.

When the working fluid in the rod-side oil chamber R (A) and bottom-side oil chamber R (B) expands to a high pressure as the environmental temperature rises in this holding state, a minute amount of operation corresponding to the expansion is performed. In each of the movable throttle valves 5, the fluid flows in the pipe Qa (A) → the oil passage portion 1 b (A) → the annular gap μ (A) → the gap between the main body small diameter portion 2 a and the throttle valve pipe 1 → the opening 1 a ( T), pipe Qa (B) → oil passage 1b (B) → annular gap μ (B) → gap between main body small diameter portion 2a and throttle valve pipe 1 → pipe through opening 1a (T) It is guided to the hydraulic tank OT by the path Qa (T) and prevents the hydraulic actuator OA from being destroyed while maintaining the holding state.

On the other hand, if the throttle valve body 2 of the movable throttle valve 5 does not move in this holding state, as shown in FIG. 1 (d), fine dust in the working fluid is put on the minute flow of the working fluid, When dust larger than the annular gap μ starts to accumulate when trying to pass through the annular gap μ, the smaller dust gradually accumulates around it, and in the worst case, as shown in this figure, the annular shape of the main body 2c Large and small dust accumulates at the entrance of the gap μ to form a ring-shaped dust ring K, which closes the annular gap μ.

  In this case, as shown by the black arrow and the black line that prevents this in the figure, the minute flow of the working fluid is blocked by the dust ring K and may not flow, which may lead to the destruction of the hydraulic actuator OA. .

However, in the movable throttle valve 5 of the present invention, the throttle valve body 2 can move, and in this case, it is normal that there is a load fluctuation in the load device W in the holding state. Due to the pressure fluctuation, the throttle valve body 2 (main body 2c) moves as indicated by white arrows in the figure.

Then, as shown in FIG. 1 (e), only the throttle valve body 2 (main body 2c) moves, the dust ring K remains in its original position, and a minute flow of the working fluid (black line indicated by the black arrow indicates blocking). Can pass through the annular gap μ without being disturbed by the dust ring K.

Further, the load fluctuation of the load device W is repeatedly generated, and along with the load fluctuation, the throttle valve body 2 (main body 2c) repeatedly moves in the direction of the white arrow in the figure and in the opposite direction. The ring K is also flushed, and the dust is scattered in the working fluid. Further, the dust ring K is not generated, and the function of the annular gap μ of the movable throttle valve 5 is exhibited over a long period of time. Continue to be.

  That is, according to the moving throttle valve 5 of the present invention, the throttle valve body 2 can be moved. When this is used in the hydraulic state holding system 10, the throttle is caused by the load fluctuation of the load device W in the holding state. The valve body 2 is swung, so that the annular gap μ is not closed due to the accumulation of dust in the working fluid, and the movable throttle valve 5 performs its function for a long time so that the hydraulic actuator OA is not destroyed. can do.

  In addition, since the movable throttle valve 5 is provided with a stopper 3 that prevents the movable throttle valve body 2 from coming out of the throttle valve passage 1, the throttle valve body 2 does not come out. The annular clearance function of the moving throttle valve 5 is maintained.

Further, in this movable throttle valve 5, since the main body small diameter portion 2a is provided in the throttle valve body 2, the opening 1a corresponding to this is provided in the throttle valve path 1, and another hydraulic pipe line can be connected to this. As described above, the movable throttle valve 5 can be used between the three pipes.

  Of course, as will be described later, the movable throttle valve 5 of the present invention can also be used between two pipe lines.

  As the annular gap μ used for such temperature compensation, a radius gap of 5 to 15 μm (diameter gap of 10 to 30 μm) is suitable.

On the other hand, when considering the problem of dust accumulation when used for other purposes, it is considered that the maximum value of the annular gap is up to about 1 mm and that there is a utility value of the movable throttle valve 5 of the present invention. .
<Reference example>

  FIG. 2A is a longitudinal sectional view showing an example of a check valve provided with the moving throttle valve of the present invention, FIG. 2B is a hydraulic circuit diagram showing a hydraulic state holding system provided with the check valve shown in FIG. c) is a front view of a throttle valve body constituting the movable throttle valve of FIG. Accordingly, the same parts as those already described are denoted by the same reference numerals and redundant description is omitted.

  The check valve 6 in FIG. 2 (a) is an integration of the moving throttle valve 5A of the present invention and a check valve (which will be described later, mainly composed of reference numerals 6f, 6g and 6d). It is accommodated in the housing H which becomes a valve accommodating part according to the situation of the part.

  The housing H is formed with a hydraulic line Ha and a hydraulic line Hb that are communicated with each other. The hydraulic lines Ha and Hb are orthogonal to each other, and the hydraulic line Hb opens on the surface of the housing H. .

  The hydraulic line Hb opens from the hydraulic line Hb to a valve fitting portion Hd having a larger diameter and further to an oil passage portion Hc having a larger diameter.

  The check valve 6 is accommodated across the valve fitting portion Hd and the oil passage portion Hc of the housing H, the valve seat cylinder 6b, the valve body cylinder 6c slidably accommodated in the valve seat cylinder 6b, and the valve body cylinder. A spring 6d that urges 6c in the valve closing direction and a rear end stopper of the valve seat cylinder 6b are provided, and a lid 6a that oil-tightly closes the oil passage portion Hc is provided.

The valve seat cylinder 6b has a cylindrical shape with one step inside, and has a short small-diameter portion 6j ( opening to one pipe line) on the inside and a larger-diameter and long-sized valve body accommodating portion 6i following this. And. A step edge from the small diameter portion 6j to the valve body housing portion 6i is an inclined surface, and this inclined surface constitutes the valve seat 6g.

The small diameter part 6j side of the outer periphery of the valve seat cylinder 6b is fitted into the valve fitting part Hd without a gap, and an O-ring 6k is fitted so as to ensure oil tightness of the fitting. An oil window 6e (the other pipe line) penetrating the peripheral wall is provided on the small diameter portion 6j side of the valve body housing portion 6i, and the working fluid flows between the valve body housing portion 6i and the oil passage portion Hc. Allowed.

  The valve body cylinder 6c is a cylinder with one side closed, and a movable throttle valve 5A is incorporated on the closed side as will be described later. A valve portion 6f that is an inclined surface facing the valve seat 6g of the valve seat tube 6b is formed on the outer edge of the valve body tube 6c on the closing side. The opening inner chamber of the valve body cylinder 6c serves as an accommodating portion 6h that accommodates the spring 6d.

  The spring 6d is housed in the housing portion 6h of the valve body cylinder 6c, and exerts an urging force between the lid 6a and the valve body cylinder 6c, and the valve portion 6f of the valve body cylinder 6c pushes the valve seat 6g of the valve seat cylinder 6b. It is energized to close.

  An oil passage 6m is provided at an appropriate position of the valve body cylinder 6c to allow the working fluid to flow between the oil window 6e of the valve seat cylinder 6b located on the outer periphery of the valve body cylinder 6c and the accommodating portion 6h inside. The oil passage 6m does not affect the closing between the valve portion 6f of the valve body cylinder 6c and the valve seat 6g of the valve seat cylinder 6b.

The valve seat cylinder 6b, the valve body cylinder 6c, and the spring 6d having such a configuration are accommodated across the valve fitting portion Hd and the oil passage portion Hc of the housing H, sealed by the lid 6a, and the hydraulic pipe line Ha. The flow of the working fluid in the direction from the (one pipe ) to the hydraulic pipe Hb (the other pipe) is blocked, but the reverse flow of the working fluid from the hydraulic pipe Hb to the hydraulic pipe Ha is permitted. It has a check valve function.

  The moving throttle valve 5A provided at the center of the closed side wall of the valve body cylinder 6c will be described.

  A throttle valve passage 1A penetrating this side wall is formed in the center of the closed side wall of the valve body cylinder 6c, and the throttle valve body 2A is movably accommodated while generating a predetermined annular gap μ therein. Are provided with stoppers 3A, 3A '.

  The micro-flow working fluid that passes through the annular gap μ flows between the hydraulic line Ha and the hydraulic line Hb.

  As shown in FIGS. 2 (a) and 2 (c), the throttle valve body 2A provided with stoppers 3A and 3A 'has a stopper 3A as the head, the neck lower part becomes the throttle valve body 2A, and the other end. A ring-shaped stopper 3A ′ is fitted into the male screw portion 3b, and is tightened with a nut 3c that is screwed into the male screw portion 3b so that the stopper 3A ′ does not fall off.

  The side surfaces of the stoppers 3A and 3A 'on the throttle valve body 2A side are provided with oil passage recesses 3a so that the flow of the working fluid is not blocked when the side surfaces come into contact with the opening side surface of the throttle valve passage 1A. It has been.

  When the throttle valve body 2A provided with the stoppers 3A and 3A 'at both ends is set in the throttle valve passage 1A, the throttle valve body 2A not equipped with the stopper 3A' from the housing portion 6h side of the valve body cylinder 6c. The non-mounting side is inserted first, and the stopper 3A ′ is fitted into the male thread portion 3b protruding to the outside of the closing side of the valve body cylinder 6c and tightened with the nut 3c.

  The check valve 6 in which the movable throttle valve 5A is integrated has a hydraulic pressure between the rod side oil chamber R (A) of the hydraulic actuator OA and the hydraulic tank OT of the hydraulic state holding system 10A as shown in FIG. One each is installed in the hydraulic line between the pipe line, the bottom side oil chamber R (B) and the hydraulic tank OT, and exhibits its check valve function and temperature compensation function.

  The moving throttle valve 5A having such a configuration is different from the moving throttle valve 5 of FIG. 1 in that it is a type used between two pipe lines, but the throttle valve body 2A is within the throttle valve path 1A. The movable point and the stoppers 3A, 3A ′ are provided in common, and the same effect as the movable throttle valve 5 is exhibited in these points.

  The hydraulic pressure state maintaining system 10A provided with the moving throttle valve 5A exhibits the effect as a system.

  FIG. 3A is a transverse sectional view showing another example of the moving throttle valve of the present invention, and FIG. 3B is a longitudinal sectional view thereof.

  The moving throttle valve 5B is provided with a valve body moving means 4 for moving the throttle valve body 2 from the outside integrally with the stopper 3B, as compared with the moving throttle valve 5 of FIGS. 1 (a) and 1 (b). Is different.

  The stopper 3B is provided with an accommodating through hole 3b for accommodating the valve body moving means 4 in an oil-tight and slidable manner in the central portion of the shaft, as compared with the stopper 3 provided in the movable throttle valve 5 of FIGS. 1 (a) and 1 (b). Is different.

  The valve body moving means 4 is provided with a large-diameter head 4d at the tip of the shaft portion 4a, and an O-ring groove 4b is provided at an appropriate position of the shaft portion 4b, and an O-ring 4c is provided in the O-ring groove 4b. Is fitted to ensure oil tightness with the accommodation through hole 3b.

  The shaft 4a of the valve body moving means 4 is slidable with respect to the accommodation through hole 3b, and the head 4d has an oil passage sandwiched between the stopper 3B and the other end 2b of the throttle valve body 2. Slide in part 1b.

  Thus, the head 4d of the valve body moving means 4 serves as a stopper for preventing the throttle valve body 2 from coming out of the throttle valve pipe 1 and at the same time, the stopper of the shaft portion 4a of the valve body moving means 4. By manually manipulating the portion going out from 3B, the inner throttle valve body 2 can be forcibly moved in a state where oil tightness is ensured.

  Therefore, according to the moving throttle valve 5B having such a configuration, even if there is no fluctuation in the pressure of each hydraulic line Qa that causes the throttle valve body 2 to move in the system incorporating the moving throttle valve 5B, the forced throttle valve 5B is forced. Therefore, the throttle valve body 2 can be moved, and the accumulation of dust can be prevented, so that the function of the annular gap can continue to be exhibited.

  Note that this forced movement can be automatically performed by a machine, not by manual operation.

  The hydraulic system provided with the moving throttle valve 5B exhibits its effect as a system.

  FIG. 4A is a transverse sectional view showing another example of the moving throttle valve of the present invention, and FIG. 4B is a longitudinal sectional view thereof.

This moving throttle valve 5C is for two hydraulic lines compared to the moving throttle valve 5 of FIGS. 1 (a) and 1 (b), has no main body small diameter portion, and has a throttle valve path 1B, a throttle valve body. The difference is that the length of 2B is the length of only one portion divided by the main body small diameter portion 2a of the movable throttle valve 5.

  Correspondingly, the opening 1d of the housing P and the hydraulic line Qa of the housing Q are only two places corresponding to the oil passage portion 1b.

  The movable throttle valve 5C having such a configuration is similar to the movable throttle valve 5A built in the check valve 6 of FIG. 2 in that the throttle valve body 2B is movable in the throttle valve path 1B, and the stopper 3 is The provided points are common, and the same effects as those of the movable throttle valve 5 are exhibited in these points.

  The hydraulic system provided with the moving throttle valve 5C exhibits its effect as a system.

  FIG. 5A is a conceptual diagram showing an example of a hydraulic seismic isolation system provided with the moving throttle valve of the present invention, and FIG. 5B is a hydraulic circuit diagram of FIG.

  This hydraulic seismic isolation system 20 prevents the building D from being affected by shaking during an earthquake. The seismic base 11 is installed on the ground E and supports the building D, and the supply of commercial power. The control device 12 having an earthquake sensor and operating the seismic isolation system in the event of an earthquake, disposed between the building D and the base isolation base 11, and a plurality of immunity that does not propagate the shaking of the ground E to the building D A seismic support means 13 is provided.

  Further, in addition to the above, the hydraulic seismic isolation system 20 includes a lock cylinder 15 in which the rod side is fixed to the building D and the cylinder side is fixed to the seismic isolation base 11 to suppress shaking due to external force in normal times, and the shaking in the event of an earthquake. And a hydraulic damper 16 that absorbs water.

  The seismic isolation support means 13 includes a base plate 13a installed on the base isolation base 11, a ball 13b placed on the base plate 13a so as to roll freely, and a building D so as to rotatably hold the ball 13b. The support member 13c provided in the lower part of the head is provided.

  The upper surface of the pedestal plate 13a is a conical or arc-shaped ball rolling surface 13d whose depth gradually decreases from the center toward the periphery, and the ball 13b is placed on the ball rolling surface 13d. Roll.

  In this example, the lock cylinder 15 uses a single rod cylinder, and includes a piston 15a, a cylinder 15b, a piston rod 15c, and a tank chamber 15d. The piston rod 15c is fixed to the seismic isolation foundation 11, and the cylinder 15b is fixed to the building D.

  The oil chamber in the cylinder 15b partitioned by the piston 15a is defined as a rod-side oil chamber R (A) and a bottom-side oil chamber R (B) as in the case of the hydraulic actuator OA in FIG.

  The tank chamber 15d is not filled with the working fluid, but stores the working fluid while leaving a certain amount of air.

  The lock cylinder 15 is provided with a seismic isolation lock pipe 14, and the seismic isolation lock pipe 14 includes a rod side oil chamber R (A) and a bottom side oil chamber R (B) of the lock cylinder 15. Hydraulic line 14c to be connected, hydraulic line 14d to connect the middle of the hydraulic line 14c and the tank chamber 15d, bypass line 14e to the hydraulic line 14c, hydraulic line 14d to the bypass line 14e and the tank chamber 15d 14f is connected to the hydraulic line 14f.

  In the pipeline system, the electromagnetic on-off valve 14a (rod side) and the electromagnetic on-off valve 14b (bottom) are respectively provided between the branch of the hydraulic pipe 14c to the bypass pipe 14e and the branch to the hydraulic pipe 14d. Side) is provided.

  A three-way moving throttle valve 5 is installed at a branch point of the bypass line 14e to the hydraulic line 14f.

  The seismic isolation function of the hydraulic seismic isolation system 20 having such a configuration will be described in detail below.

  Normally, the electromagnetic shut-off valves 14a and 14b of the seismic isolation lock pipe 14 are turned off to maintain the closed state of the hydraulic pipes 14c and 14d. The building D supported so as to be swingable at 13 is prevented from swinging.

  In this state, the seismic isolation lock line 14 and the lock cylinder 15 of the hydraulic seismic isolation system 20 function as a hydraulic state maintaining system, and the lock cylinder 15 is always subject to fluctuating loads due to wind on the building D or the like. In response, the throttle valve body 2 of the moving throttle valve 5 moves and the annular gap is not blocked, and the temperature compensation function is exhibited and maintained.

  On the other hand, when an earthquake occurs, the control device 12 supplies power to the electromagnetic on-off valves 14a and 14b, and the hydraulic lines 14c and 14d are opened, so that the rod side oil chamber R ( The working fluid can flow between A) and the bottom side oil chamber R (B), and the piston 15a can move freely (unlocked state). At this time, the hydraulic damper 16 functions as a seismic isolation damper, absorbs the shaking of the earthquake, and suppresses the shaking of the building D.

  In this case, the rod-side oil chamber R (A) and the bottom-side oil chamber R (B) differ in the amount of inflow and outflow of the working fluid by the amount of the piston rod 15c. The opened hydraulic line 14d is returned to the tank chamber 15d adjusted by air and supplied from the tank chamber 15d.

  In this way, the hydraulic seismic isolation system 20 including the moving throttle valve 5 has a temperature compensation function that is demonstrated over a long period of time, prevents the lock cylinder 15 from being destroyed, and ensures its stable and reliable operation. In the event of an earthquake that does not know whether it will occur, the lock function is surely released.

Moreover, the moving throttle valve 5 can be obtained by using such natural wind power that is always generated.
Therefore, the maintenance of the temperature compensation function is almost unnecessary.

  In the first to fifth embodiments, various movable throttle valves 5, 5A, 5B, and 5C are illustrated. However, these are merely examples, and the movable throttle valve of the present invention is not limited to these. .

  The hydraulic state holding systems 10 and 10A and the hydraulic seismic isolation system 20 provided with these movable throttle valves 5, 5A, 5B, and 5C are not limited to those illustrated.

  Further, the combinations of the respective parts, throttle valve passages, throttle valve bodies, stoppers, and valve body moving means shown in the illustrated moving throttle valves 5, 5A, 5B, and 5C are not limited to the illustrated ones, and various combinations are possible. And each part is not limited to what was illustrated, but various deformation | transformation are possible.

  Further, the combinations of the components shown in the illustrated hydraulic state maintaining systems 10 and 10A and the hydraulic seismic isolation system 20, the movable throttle valves 5, 5A, 5B, and 5C are not limited to the illustrated ones, and various combinations are possible. And each part is not limited to what was illustrated, but various deformation | transformation are possible.

  For example, the small-diameter portion of the throttle valve body is not limited to a single location, and can be a plurality of locations. Accordingly, a movable throttle valve applicable to three or more directions can be provided.

  In addition to the hydraulic cylinder described herein, the hydraulic actuator includes a hydraulic rotary actuator that outputs a hydraulic driving force as torque.

  The movable throttle valve, fluid pressure state maintaining system, and fluid pressure seismic isolation system of the present invention are used in all industrial fields that are required to be able to prevent the annular gap from being clogged with dust in the working fluid with a simple configuration. be able to.

(A) is a cross-sectional view showing an example of a moving throttle valve of the present invention, (b) is a longitudinal sectional view thereof, and (c) is a hydraulic state holding system including the movable throttle valves of (a) and (b). FIG. 4 is a hydraulic circuit diagram showing an example of the present invention, (d) and (e) are conceptual diagrams for explaining the function of the movable throttle valve of the present invention (A) is a longitudinal cross-sectional view which shows an example of the check valve provided with the movement throttle valve of this invention, (b) is a hydraulic circuit diagram which shows the hydraulic state maintenance system provided with the check valve of (a), (c) (A) Front view of throttle valve body constituting movable throttle valve of (a) (A) is a cross-sectional view showing another example of the movable throttle valve of the present invention, and (b) is a vertical cross-sectional view thereof. (A) is a cross-sectional view showing another example of the movable throttle valve of the present invention, and (b) is a vertical cross-sectional view thereof. (A) is a conceptual diagram which shows an example of the hydraulic seismic isolation system provided with the movement throttle valve of this invention, (b) is the hydraulic circuit diagram of (a)

Explanation of symbols

1, 1A, 1B Throttle valve path 1a Opening 2, 2A, 2B Throttle valve body
2a Main body small diameter part
2b Small diameter part at both ends
2c Main body 3, 3A, 3B Stopper 4 Valve body moving means 5, 5A, 5B, 5C Moving throttle valve 10, 10A Hydraulic state holding system 20 Hydraulic seismic isolation system μ Annular gap

Claims (6)

Used in the fluid pressure circuit, restricting the flow rate of the working fluid by a throttle valve path that is a circular pipe through which the working fluid passes and the annular gap between the outer diameter and the inner diameter of the valve path. A throttle valve having a cylindrical throttle valve body,
The throttle valve body has a main body that forms the annular gap with the throttle valve path, and is movable in the throttle valve path by the pressure reaching the throttle valve.
To a pipe line that releases the working fluid expanded as the temperature of the fluid pressure circuit rises to a part of the throttle valve path that accommodates the main body or a part of the throttle valve path that is outside the part of the throttle valve path that accommodates the main body. Opening is provided,
The moving throttle valve, wherein at least one of both ends of the main body is located in the throttle valve path within a range of movement of the throttle valve body in the throttle valve path. The throttle valve body is provided with both end small diameter portions at both ends of the main body having a smaller diameter than the outer diameter of the main body,
The moving throttle according to claim 1, wherein the opening provided in a portion of the throttle valve passage that is outside the portion that accommodates the main body is provided at a position corresponding to the small diameter portion at both ends. valve. The throttle valve body includes a main body small diameter portion in which a part of the main body has a smaller outer diameter,
The movable throttle valve according to claim 1 or 2, wherein the opening provided in a portion of the throttle valve passage that accommodates the main body is provided at a position corresponding to the small diameter portion of the main body. The moving throttle valve according to any one of claims 1 to 3 , further comprising a stopper that prevents the throttle valve body from slipping out of the throttle valve path. A fluid pressure state maintaining system comprising the movable throttle valve according to any one of claims 1 to 4 . A fluid pressure isolation system comprising the movable throttle valve according to any one of claims 1 to 4 .

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