JPS594202Y2 - spool valve - Google Patents

Description

[Detailed Description of the Invention] Field of Application The present invention relates to a spool valve that controls the flow of fluid by driving the spool using an electromagnetic operating force, a mechanical operating force, or a fluid pressure operating force.

Prior art and its problems In a conventional spool valve, when an O-ring as an elastic valve body is attached to the spool, a configuration as shown in FIG. 5, for example, has been adopted.

That is, the O-ring 27 is expanded in diameter and installed in the outer circumferential groove 29 of the spool 28, and its tensile force causes the O-ring 27 to expand.
This prevents it from popping out from the outer circumferential groove 29,
Since the tensile strength of the O-ring 27 has a limit depending on its wire diameter, the working fluid pressure or fluid passage capacity is limited.1.
Furthermore, since an unreasonable force is constantly applied to the O-ring 27, the physical properties of the O-ring 27 are deteriorated, resulting in a reduction in reliability.

Technical Problems of the Present Invention An object of the present invention is to prevent floating of the elastic valve body mounted on the outer periphery of the spool by supporting it in a state that can reliably suppress displacement of the spool in the radial direction.

Technical Measures The technical measures taken to solve the above problem were to attach an elastic valve body to the outer periphery of the spool, and drill holes in the spool at multiple locations on the inner circumference of the annular valve body that makes sliding contact with the valve seat. They are formed in a state in which they are interconnected by a connecting portion within the hole.

action The above technical means works as follows.

In other words, even if fluid pressure or mechanical force due to sliding is applied to the elastic valve body, the elastic valve body is pulled and supported in the axial direction of the spool by the supporting force of the connecting portion, and its diameter expansion deformation is prevented. This prevents displacement or dislodgement due to lifting.

Unique effects of this invention The present invention produces the following unique effects.

In other words, since the elastic valve body can be attached to the spool by molding, there is no need to bake and bond the elastic valve body to the spool. Therefore, various elastic materials that cannot be used with conventional baking and bonding methods can be used. It can be used regardless of adhesiveness, making it compatible with a variety of fluids, and by attaching an elastic valve body by molding, it is possible to process the outer diameter, which makes it easy to obtain high precision. It achieves high reliability and is easy to assemble.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, 1 is a valve housing of a directional control valve, and 2 is a valve housing 2 that is slidable in the axial direction inside the valve housing 1. This spool 2 is an inserted spool, and is configured to be driven by an electromagnetic operating force, a mechanical operating force, or a fluid pressure operating force acting on the end.

A supply port 3 bored in the valve housing 1 is provided in the inner wall of the valve housing 1.
, inner circumferential grooves 6, 7a, 7b, 8a, 8b communicating with the output ports 4a, 4b and the discharge ports 5a, 5b are provided, and valve seat portions 9a, 9b, 10a, are provided on the inner wall of the valve housing between these inner circumferential grooves.
10b, and the spool 2 has the valve seat parts 9a to 10b.
Elastic valve bodies 11a, 11b, 1 which communicate and block the flow paths 3 to 5b of the valve housing 1 by cooperation with 10b.
2a and 12b are installed.

These elastic valve bodies 11a to 12b are each made of an elastic material such as synthetic rubber, and are mounted on the spool 2 in the state shown in FIGS. 1 and 2.

That is, the annular valve body part l of the elastic valve body 11a and the cylindrical mounting ring part m extending in the axial direction thereto are attached to the spool 2.
The side end surface of the valve body l is brought into contact with the annular vertical wall 14 adjacent to the outer circumferential groove 13, and the inner circumferential portion of the valve body l is attached to a plurality of places on the spool. Connecting portion n in the hole 15 drilled in a cross shape in the diametrical direction of No. 2
are interconnected by.

The other elastic valve bodies 11b, 12a, and 12b also have substantially the same configuration as the elastic valve body 11a, and are attached to the spool 2 in the same manner, so they are given the same reference numerals. Their explanation will be omitted.

In the figure, 16a and 16b are sealing members provided around the spool 2 at both ends, and since these do not escape from the outer circumferential grooves 17a and 17b, conventionally known sealing members are used. Elastic valve bodies 113-12
It can also have the same configuration as b.

In the four-way switching valve having such a configuration, when the spool 2 is in the first switching position shown in FIG.
The fluid from the supply port 4a flows into the output port 4a, and the fluid from the output port 4b flows out to the discharge port 5b. Fluid from output port 3 flows to output port 4b, and fluid from output port 4a is discharged through discharge port 5a.

Thus, when the spool 2 is in the first switching position, the valve body portions l of the elastic valve bodies 11b and 12a, and when the spool 2 is in the second switching position, the elastic valve body 1
Fluid pressure acts on each of the valve body parts 1a and 12b, and even if each valve body part 1 attempts to expand its diameter due to this fluid pressure, the inner peripheral part of each valve body part l passes through the hole 15 of the spool 2 in a cross shape. Since the valve body l is connected to the spool 2, the diameter expansion deformation of the valve body l is prevented, and the valve body l and the mounting ring m do not rise up and come off from the outer circumferential groove 13. Therefore, when switching, the spool 2 There is no increase in sliding resistance.

In addition, even if each valve body part l attempts to shift in the axial direction on the spool 2 due to the fluid pressure, not only will the valve body part l not come off from the outer circumferential groove 13 as described above, but the valve body part l will also be moved toward the rear side. is supported by the annular vertical wall 14, the mounting position of each valve body part l is reliably held and there is no shift in the axial direction, and therefore each valve body part l performs the required valve action to maintain the flow path. The switching is performed reliably.

3 and 4 show other embodiments of the present invention,
This figure shows a case where an arbitrary number of each of the elastic valve bodies in the above embodiments are sequentially connected in the axial direction inside the shaft hole of the spool.

That is, the elastic valve body 21b. 22b, a radial connecting portion n' extends from the annular valve body portion 1 in the axial direction,
The inner end of the connecting part n' is connected to the outer peripheral surface of the cylindrical connecting cylinder part p passing through the shaft hole 24 of the spool 23, thereby connecting multiple parts of the valve body part 1 through each connecting part n'. In addition to being interconnected, the plurality of elastic valve bodies 21 b and 22 b are interconnected in the axial direction.

The center hole of the connecting cylinder part p can also be filled with an elastic material.

Note that the other configurations are the same as those in FIGS. 1 and 2, so the same parts are given the same reference numerals and the explanation thereof will be omitted.

Although each of the above embodiments describes the case where the present invention is applied to a four-way switching valve, it is of course applicable to other various types of spool valves.

[Brief explanation of drawings]

Figure 1 is a partial sectional view of an embodiment of the present invention, and Figure 2 is its A.
3 is a partial sectional view of a spool according to another embodiment of the present invention, FIG. 4 is a sectional view taken along line B-B, and FIG. 5 is a partial sectional view of a conventional spool. 1... Bento, 2, 23... Spool,
9a, 9b. 10 a, 10 b-- Valve seat portion, 11 a,
11 b, 12 a, 12 b, 21 b, 22
b...Elastic valve body, 15...hole, l...
... Valve body part, n, n'... Connection part.

Claims (1)

[Scope of utility model registration request] A spool is slidably inserted in the axial direction into a valve housing provided with a plurality of channels through which fluid flows in and out, and the spool is arranged around the outer periphery of the spool in cooperation with a valve seat on the inner surface of the valve housing to accommodate the plurality of flow channels. Connecting roads,
In a device equipped with an elastic valve body that shuts off, the elastic valve bodies are interconnected by connecting portions in holes drilled in the spool at multiple locations on the inner circumferential portion of the annular valve body that makes sliding contact with the valve seat. A spool valve characterized by being formed in a state in which