JP2531833Y2 - Spool valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a main valve that reciprocates in a valve body for opening and closing or switching a flow path, and is fixed to the main valve to drive the main valve. The present invention relates to a spool valve having a cylinder actuator.

[Conventional technology]

A cylinder actuator for driving a main valve such as a spool or a slide valve is provided, a pilot fluid pressure is applied to the cylinder actuator to apply a driving force, and the movement of the piston moves the main valve to open / close or switch the flow path. Has been known for some time.

In such a valve, the piston diameter of the cylinder actuator is determined by the relationship between the force required to drive the main valve and the fluid supply pressure. Therefore, in the case of a main valve whose driving force fluctuates greatly due to friction fluctuation or the like or a valve used under a condition where the supply pressure fluctuates widely, the main valve can be driven under the worst conditions. Therefore, the outer diameter of the piston is larger than that of a piston that meets the average use condition.

In addition, if the mounting dimensions are determined by standards or the like, the outer diameter of the piston is limited, and the use conditions of the valve having such a cylinder actuator are limited, and the driving force fluctuation and the supply pressure fluctuation width are limited. If it is large, it may not be used.

When mounting a plurality of valves closely to each other on a manifold or the like, it is often required to mount the valves at a short pitch so as to require as few places as possible. In this case, it is necessary to reduce the width of the valve. However, the lateral width of the valve is determined by the piston diameter and the cylinder thickness of the cylinder actuator, which generally results in the maximum piston outer diameter being selected with no headroom. In order to obtain a driving force as large as possible from this, it is necessary to increase the minimum working pressure of the fluid, which is limited in terms of the working pressure range. In addition, if friction fluctuations occur due to fluctuations in the lubrication state of the piston, there is no room for the driving force of the piston, causing a situation where the driving is not performed smoothly, and the friction after a long stoppage is increased. There is a problem that the startup in is unstable. Further, in order to reduce the valve drive, it is necessary to finish the surface or to perform a plating process, which causes a problem that the processing cost increases.

Further, a return cylinder actuator which always gives a fixed driving force to one end of the spool in the spool valve, and a driving cylinder actuator which is twice the driving force for return is arranged at the other end, and a pressure is supplied to the cylinder actuator. In the case of a return type valve that reciprocates the spool in the same operating time by discharging, when the driving force of the driving cylinder actuator is appropriately set, the driving force of the returning cylinder actuator, which must be reduced by half, is adjusted. However, there was a problem that it was troublesome.

[Problems to be solved by the invention]

It is an object of the present invention to provide a spool valve that solves the above-mentioned conventional problems and can operate stably even when the width of the valve is reduced, and that can easily adjust the operation time for reciprocating the main valve. And

[Means to solve the problem]

The present invention provides a spool valve having a main valve that reciprocates in a valve body for opening and closing or switching a flow path, and a cylinder actuator that is fixed to the main valve and drives the main valve. Can be separated and stacked and connected, and the diameter of the piston of each cylinder actuator is the same, and the outer diameter of the cylinder actuator and the outer diameter of the valve body are set to be substantially the same,
In the cylinder actuator, the axis of the piston coincides with the axis of the main valve, and a plurality of cylinder actuators stacked on one of both sides of the main valve, and one or more cylinder actuators on the other side, respectively. It was solved by placing.

Further, the piston has a piston portion and a shaft portion,
The shaft portion is formed so as to be connectable to a piston portion of an adjacent piston, and a flow passage penetrating in the axial direction is formed in each piston so as to be able to communicate with each other, and the flow passage is opened to the outside of the shaft portion of each piston. It is effective if a radiation flow path is formed.

〔Example〕

 The details of the present invention will be described based on an embodiment shown in the drawings.

In FIG. 1, a spool valve 1 has a valve body 2 and a spool 3 as a main valve that slides inside the valve body 2. The P port as an inlet formed in the valve body 2, the A port as a first outlet, the B port as a second outlet, the R1 port as a _first outlet, and the R2 port as a _second outlet The connection is switched by moving the ring grooves 4 and 5 of the spool 3. In the state shown in the figure, the P port and the A port communicate with each other, and the B port and R ₂ are connected.

Cylinder actuators are fixed to both ends of the spool 3, respectively. A first cylinder actuator 6 is fixed or integrally formed on the right side of the drawing, and a second cylinder actuator 7 is formed on the left side of the drawing. The pistons of the cylinder actuators 6 and 7 have the same diameter, and the spool 3 is formed to have substantially the same diameter. Thus, the outer diameters of the valve body 2 and the cylinder actuators 6 and 7 can be easily made the same. The lateral width (the thickness in the vertical direction in the figure) of the spool valve 1 can be minimized.

The cylinder actuators 6 and 7 are configured such that the cylinders 8 each accommodating the piston 9 can be integrally or connected to the valve body 2. If it is configured to be connectable, the cylinders 8 can be rearranged as necessary, and the productivity can be increased by using a common cylinder.

In FIG. 1, the first cylinder actuator 6 can be of a two-layer type in which a second cylinder actuator 6b is fixed at a predetermined interval to the first cylinder actuator 6a. 6c
May be fixed to a three-layer type. The three cylinder actuators 6a, 6b, and 6c can be formed integrally with each other, but the second cylinder actuator 6b is used as the first cylinder actuator 6a, and the third cylinder actuator 6c is used as two cylinder actuators. The second cylinder actuator
It may be detachable from 6b. In this case, the second cylinder actuator 6b and the third cylinder actuator 6c have a shape having a piston 9 and a shaft 10, and the free end of the shaft 10 of the second cylinder actuator 6b is Connected to the head by screwing, etc.
The shaft 10 of the third cylinder actuator 6c is configured to be connectable to the piston 9 of the second cylinder actuator 6b.

Two or three cylinder actuators 6a, 6b, 6c
Are formed integrally with each other, a cylinder 8 having a length for accommodating two or three cylinder actuators is formed, and a partition wall 11 is provided at a required position, but when the cylinder actuators 6b and 6c can be separated from each other. , The common cylinders 8 are sequentially connected by the number of cylinder actuators, and the lid 11 of each cylinder 8 can be formed so as to also serve as a partition between the pistons. The lid 11 of the outermost cylinder 8 is a blind lid.

Spool 3 for cylinder actuators 6a, 6b, 6c
The first piston chamber 12 on the opposite side is connected to the P port via a switching valve 13 by a flow path 14, and the first piston chamber 12 'on the opposite side to the spool 3 of the cylinder 8 with respect to the second cylinder actuator 7. Is connected to the P port by a flow path 16, and a pressure fluid can be supplied to the first piston chamber 12 ′ at all times by switching the switching valve 13 to the first piston chamber 12.

The second piston chamber of each cylinder 8 opposite to the first piston chamber has an exhaust port 15 communicating with the outside, thereby preventing back pressure from being generated on the cylinder actuators 6a, 6b, 6c and 7 and enabling smooth movement. To

When the fluid in each of the first piston chambers 12 is discharged by switching the switching valve 13, the spool 3 is moved rightward in the drawing by the force of the second cylinder actuator 7, and the fluid is transferred to the first piston chamber 12 by switching the switching valve 13. Is supplied, the spool 3 is moved to the left in the drawing by the force of the first cylinder actuator 6 due to the pressure receiving area difference.

When not only the first cylinder actuator 6 but also the second drive cylinder actuator 7 enables switching of the supply and discharge of the fluid in the first piston chamber 12 'by the switching valve, the second piston 7 also has the same number of actuators as the first drive cylinder actuator. Can also be configured. In this case, if the number of pistons of each cylinder actuator is not large, the pressure of the pressurized fluid can be lowered to obtain a desired driving force. In addition, since the piston diameters of the cylinder actuators are formed to be the same, the driving forces are equal, so that a return type spool valve in which the driving forces at both ends of the spool 3 are 2: 1 can be easily obtained.

Compared to the example of FIG. 1, the flow path 16 penetrating through the shaft 10 and the piston 9 of each cylinder actuator 6b, 6c as shown in FIG.
If a radial path 17 connected to the flow path 16 and opened to the first piston chamber 12 is formed in the shaft portion 10, the flow path 14 connected to the switching valve 13 is connected to the first cylinder actuator 6 a It is necessary to form a special flow path for the cylinder 12 containing the second cylinder actuator 6b and the third cylinder actuator 6c by connecting only to the first piston chamber 12 of the cylinder 8 containing the cylinder 8 Fluid can be supplied. It has a second cylinder actuator 6b in the piston chamber 12 for the first cylinder actuator 6a.
The radial passage 17 of the shaft portion 10 is opened, the fluid in the first piston chamber 12 flows into the first piston chamber 12 through the fluid 14 of the second cylinder actuator 6b, and the piston of the second cylinder actuator 6b This is because it acts on the part 9. Similarly, the flow path for the third cylinder actuator 6c
Fluid flows into the first piston chamber 12 through 16, and fluid pressure acts on the piston 9. In FIG. 2, since the structure of each piston of the first cylinder actuator 6 is the same as in the example of FIG. 1, the same or corresponding parts are denoted by the same reference numerals and description thereof is omitted.

Although the liquid sealing means is not described in the above description, it is natural that an appropriate sealing member is provided at a necessary portion.

〔effect〕

According to the present invention, an appropriate driving force can be obtained while reducing the outer diameter of the cylinder actuator. Therefore, the width of the valve can be minimized, and the installation space can be reduced.

According to the present invention, it is possible to prevent the pilot pressure from dropping due to the inflow condition of the valve and to prevent the driving force of the cylinder actuator from being insufficient when the valve is restarted after a long-term stop.

According to the present invention, by selecting the number of cylinder actuators to be connected, an arbitrary driving force can be obtained in a stepwise manner, and it has become possible to meet various demands of users.

According to the present invention, the valve body and the cylinder are each made into a block, so that the user can appropriately combine the blocks and the usability is improved.

[Brief description of the drawings]

1 is a sectional view of a spool valve according to the present invention, and FIG. 2 is a sectional view of a modification. DESCRIPTION OF SYMBOLS 1 ... Valve, 2 ... Valve body 3 ... Main valve, 6 ... First cylinder actuator 6a, 6b, 6c ... Cylinder actuator 7 ... Second cylinder actuator 8 ... Cylinder, 9 ... Piston 10 ... … Shaft

Claims (2)

(57) [Scope of request for utility model registration] 1. A spool valve having a main valve reciprocating in a valve body for opening and closing or switching a flow path, and a cylinder actuator fixed to the main valve and driving the main valve, wherein the cylinder actuator is A plurality of the cylinder actuators can be stacked and connected, the pistons of the respective cylinder actuators have the same diameter, and the outer diameter of the cylinder actuator and the outer diameter of the valve body are set to substantially the same diameter. In the actuator, the axis of the piston coincides with the axis of the main valve, and a plurality of cylinder actuators stacked on one of both sides of the main valve and one or more cylinder actuators are arranged on the other side. A spool valve. 2. The cylinder actuator has a piston and a shaft thereof, and the shaft is formed so as to be connectable to a piston of an adjacent cylinder actuator, and each piston communicates with a flow path penetrating in the axial direction. The spool valve according to claim 1, wherein a radial flow path that is formed so as to be able to open the flow path to the outside is formed in a shaft portion of each piston.