JPH0534370U - Direction switching valve - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a directional control valve that does not have a sealing failure due to the insertion and insertion of a sleeve. [Structure] The inner peripheral surface of a sleeve hole 15 provided in the valve body 14 and the outer peripheral surface of a sleeve 22 inserted into the sleeve hole are arranged such that the outer diameters of the sealing members 30 to 34 on the front end side in the sleeve insertion direction are Communication holes 16 to 20 of the port on the base end side than that
The tapered surface has a diameter smaller than the inner diameter of the opening. [Effect] When the sleeve is inserted into the sleeve hole, the seal member is not displaced or damaged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a directional control valve, and more particularly, to a directional control valve having a sleeve.

[0002]

[Prior Art]

 As shown in FIG. 3, the valve member 6, which is provided in the valve body 5 in which the sleeve 3 is inserted into the cylindrical sleeve hole 2 provided in the valve body 1 and slides in the valve hole 4 of the sleeve 3, A directional control valve that switches the communication between the ports 7, ... Opened in the valve body 1 by means of this is already known, and this known directional control valve seals the sleeve hole 2 on the outer peripheral surface of the sleeve 3. The sealing members 8, ... Are fitted. However, since the outer diameter of the seal member 8, ... Is larger than the inner diameter of the sleeve hole 2 due to the sealing margin for sealing the sleeve hole 2, when the sleeve 3 is inserted into the sleeve hole 2, , The sealing member 8 on the tip side of the sleeve insertion direction is hooked on the opening 9 to the sleeve hole 2 of the port 7 on the base end side of the sealing member 8 from the predetermined sealing position. It may be displaced or damaged, resulting in a defective seal.

In order to solve this problem, it is conceivable to reduce the seal allowance of the seal members 8, ..., However, if the seal allowance is small, fluid easily leaks, which is not preferable.

[0004]

[Problems to be solved by the device]

 The problem to be solved by the present invention is to provide a directional control valve that does not have a sealing failure due to the insertion and insertion of a sleeve.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a valve having an axial sleeve hole and a plurality of ports which are axially arranged on an outer peripheral surface and individually communicate with the sleeve hole by a radial communication hole. The sleeve hole includes a main body, a valve hole in the axial direction, a plurality of flow paths that individually face the communication hole and open to the valve hole, and a plurality of sealing members that seal between the sleeve hole and the sleeve hole. In a directional valve having a sleeve inserted and a valve body that slides through the valve hole to switch communication between the ports, the inner peripheral surface of the sleeve hole and the outer peripheral surface of the sleeve are connected to each other by inserting the sleeve into the sleeve. It is characterized in that the outer diameter of the seal member on the tip side in the mounting direction is a tapered surface that is smaller than the inner diameter of the communication hole opening on the base end side. In addition, in order to solve the same problem, the inner diameter of the sleeve hole and the outer diameter of the sleeve are set so that the outer diameter of the seal member on the distal side of the sleeve insertion direction is smaller than that of the communication hole opening on the proximal side. The feature is that the diameter is gradually reduced in the insertion direction of the sleeve so that the diameter becomes smaller than the inner diameter.

[0006]

[Action]

 The inner peripheral surface of the sleeve hole and the outer peripheral surface of the sleeve are tapered or compressed such that the outer diameter of the seal member on the tip side in the sleeve insertion direction is smaller than the inner diameter of the opening of the communication hole on the base end side. Because of the radial surface, the position of the sealing member does not shift or break when the sleeve is inserted into the sleeve hole.

[0007]

【Example】

 FIG. 1 shows a first embodiment of the present invention. This directional control valve comprises a valve portion 11 and a drive portion 12, and a valve body 14 in the valve portion 11 has an axial sleeve hole 15 and an outer peripheral surface. The pressure fluid input port P, which is opened approximately in the central portion in the axial direction, the output ports A and B on both sides in the axial direction, the discharge ports EA and EB on both sides thereof, and these ports are individually provided in the sleeve hole 15. It has the communicating holes 16 to 20 in the radial direction for communicating with each other.

The sleeve 22 inserted into the sleeve hole 15 individually opposes the valve hole 23 at the center in the axial direction and the communication holes 16 to 20 in the radial direction so as to communicate these communication holes with the valve hole 23. Sealing members 30 to 35 for sealing the gap with the sleeve hole 15 are sequentially fitted in an annular groove formed on the outer peripheral surface having the flow passages 24 to 28. In the inner peripheral surface of the sleeve hole 15 and the outer peripheral surface of the sleeve 22, the outer diameters of the seal members 30 to 35 on the distal side in the insertion direction of the sleeve 22 are smaller than the communication holes 16 to 20 on the proximal side. The inner diameter of the opening is smaller than the inner diameter of the opening. The valve element 37 reciprocally inserted into the valve hole 23 has a plurality of valve members 38, ..., These valve members 38 ,. A valve spring 42 is provided between the sleeve hole 15 and the cover 41 which closes the base end of the sleeve hole 15 so as to switch the communication between the ports.

In the drive unit 12, the fixed iron core 46 attracts a movable iron core (not shown) by energizing the coil 45, and the push rod 47 operates the valve body 37 by this. However, the drive unit 12 of the present invention is not limited to the solenoid drive, and the valve body can be operated by fluid pressure or mechanical pressing force.

In the first embodiment, the outer diameters of the seal members 30 to 35 fitted in the sleeve 22 are smaller than the inner diameters of the openings of the communication holes 16 to 20 on the base end side. As a result, when the sleeve 22 is inserted into the sleeve hole 15, the seal members 30 to 35 do not get caught in the openings of the communication holes 16 to 20, so that a seal defect due to displacement or damage of the seal member is prevented. Since each seal member can be provided with a necessary sealing margin, there is no fluid leakage.

When a current is passed through the coil 45, the valve body 37 moves through the valve hole 23 by the drive unit 12, and the valve members 38, ... Switch the ports A and B to the ports P, EA and P, EB. Switch to communicate.

FIG. 2 shows a second embodiment of the present invention, in which a valve body 52 of a valve portion 51 of the second embodiment has a sleeve hole 53 whose diameter gradually decreases from the base end side toward the tip end side in the sleeve insertion direction. And the communication holes 55 to 59 for communicating the ports EA, A, P, B, and EB with the sleeve hole 53 are open at the corresponding reduced diameter portions. On the other hand, the sleeve 61 inserted into the sleeve hole 53 has an outer shape similar to that of the sleeve hole 53, and the seal members 30 to 35 have openings of the communication holes 55 to 59 on the base end side thereof. It has a smaller diameter and an outer diameter that seals the reduced diameter portion on the tip side.

Since the other structure and operation of the second embodiment are the same as those of the first embodiment, the same reference numerals are given to the main parts in the figure and the detailed description will be omitted. Although the above-mentioned embodiments are all 5-port valves, the directional control valve of the present invention is not limited to this.

[0014]

[Effect of the device]

 In the directional control valve of the present invention, when the sleeve is inserted into the sleeve hole, there is no displacement or damage to the sealing member, so that the sealing is reliable.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a main part of a first embodiment.

FIG. 2 is a vertical sectional front view of a main part of a second embodiment.

FIG. 3 is a vertical sectional front view of a main part of a known directional control valve.

[Explanation of symbols]

 14,52 Valve body 15,53 Sleeve hole 16-20, 55-59 Communication hole 22,61 Sleeve 23 Valve hole 24-28 Flow path 30-35 Seal member 37 Valve body P, A, B, EA, EB port

Claims (2)

[Scope of utility model registration request] 1. A valve body having an axial sleeve hole and a plurality of ports which are arranged on the outer peripheral surface in the axial direction and individually communicate with the sleeve hole by means of radial communication holes, and an axial valve hole, A plurality of flow passages that individually face the communication hole and open to the valve hole; and a plurality of seal members that seal between the sleeve hole and the sleeve, and the sleeve inserted into the sleeve hole; In a directional control valve having a valve body that slides through a hole to switch communication between ports, the inner peripheral surface of the sleeve hole and the outer peripheral surface of the sleeve have an outer diameter of a seal member on the leading end side in the sleeve insertion direction. A directional control valve having a tapered surface with a diameter smaller than the inner diameter of the communication hole opening on the base end side. 2. The outer diameter of the inner peripheral surface of the sleeve hole and the outer peripheral surface of the sleeve is smaller than the inner diameter of the communication hole opening on the base end side of the seal member on the tip side of the sleeve insertion direction. The directional switching valve according to claim 1, wherein the diameter is successively reduced in the insertion direction of the sleeve.