JP2560882Y2 - valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve used for a control valve of a hydraulic control device, for example, and more particularly to a structure of a seal between a valve body and a valve seat.

[0002]

2. Description of the Related Art As a conventional valve of this type, for example, a solenoid valve 1 as shown in FIGS.
00. That is, the valve portion 101 is provided in the guide hole 10 of the valve housing 103 having the port 102.
4 is provided with a valve body 105 and a valve seat 106 on the inner circumference, and the solenoid 1
The valve body 105 is brought into contact with the valve seat 106 by utilizing the electromagnetic attraction force of the solenoid valve 07, and the valve body 1 is biased by the spring 108.
05 is separated from the valve seat 106 to open and close the flow path 109 opened to the valve seat 106.

A portion of the valve seat 106 facing the valve body 105 is provided with a hole 110 through which the valve body 105 can be taken in and out. The hole 110 allows the valve to flow from the port 102 of the valve seat 103 to the flow path 109 through the hole 110. Has become.

The hole 110 has an inner peripheral wall 111 extending substantially parallel to the axis of the valve body 105, a tapered surface 112 having a tapered shape at the opening end of the inner peripheral wall, and a hole bottom 113 through which the flow path 109 opens. And is composed of That is,
The flow from the port 102 of the valve seat 103 is restricted by the tapered surface 112, and the outer peripheral wall 114 of the valve body 105 is further reduced.
When the valve body 105 attempts to close due to the electromagnetic attraction force of the solenoid 107, a fluid force is applied in a direction in which the valve body 105 closes. And the valve is reliably closed.

[0005]

However, in the case of the above-mentioned prior art, the valve element 105 has a spring 108.
When the valve is opened by the urging force, the fluid force applied in the direction to close the valve body 105 is balanced with the urging force of the spring 108, and the valve body 105 cannot be completely opened.

The present invention has been made to solve the above-mentioned problems of the prior art. It is an object of the present invention to open a valve without disturbing the fluid force applied when the valve is closed. An object of the present invention is to provide a valve capable of achieving time stability.

[0007]

In order to achieve the above object, according to the present invention, a guide hole is provided in a valve housing having a port, and a valve seat and a valve body are provided on an inner periphery of the guide hole. A valve that opens and closes a flow path opened to the valve seat by moving the body toward and away from the valve seat, and provided with a hole through which the valve body can be taken in and out of a portion of the valve seat facing the valve body. An inner peripheral wall extending substantially parallel to the axis of the valve body, a tapered surface having a tapered opening end corner of the inner peripheral wall, and a hole bottom where the flow path opens, and a fluid passes through the hole. In the valve flowing between the port and the flow path, a passage through which a fluid can flow is provided in a part of the inner peripheral wall from the tip of the tapered surface.

[0008]

In the valve having the above structure, the passage is provided in a range from the tip of the tapered surface formed in the hole provided in the portion of the valve seat facing the valve element to a part of the inner peripheral wall of the hole. Therefore, the flow in the passage portion is a flow in a direction perpendicular to the axial direction of the valve body. Therefore, the fluid force acts in the vertical direction on the gap between the distal end surface of the valve body and the bottom of the valve seat, and becomes a component of the force in the valve opening direction of the valve body. And stability can be achieved.

Further, in a portion where the passage of the inner peripheral wall of the hole is not notched, a throttle structure by a gap remains between the inner peripheral wall and the outer peripheral wall of the valve body, so that a fluid force is applied when the valve body is closed. The closing of the valve body is also performed reliably.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment. FIGS. 1 and 2 show a valve according to an embodiment of the present invention. In this embodiment, a case where the invention is applied to a solenoid valve as in the conventional example will be described as an example.

Reference numeral 1 denotes an entire solenoid valve.
The schematic configuration is such that a valve portion 2 as a valve structure is assembled in a valve insertion hole 4 of a solenoid body 3, and a valve body 5 serving as a valve body and a valve seat serving as a valve seat utilizing electromagnetic attraction force from the solenoid body 3. The channel 7 is opened and closed by being brought into contact with and separated from the valve seat 6.

The valve portion 2 has a port 8 penetrating in the radial direction.
And a guide hole 10 provided in the valve housing 9. The valve seat 6 is provided on the inner periphery of the guide hole 10, and a bearing 11 is provided on the inner periphery of the guide hole 10.
Said valve body 5 inserted reciprocally through
A spring 12 for urging the valve body 5 toward the solenoid body 3 between the outer circumference of the valve body 5 and the inner circumference of the guide hole 10.
And the configuration comprising:

The valve body 5 has a U-shaped cross section, and is provided with a small-diameter protrusion 51 protruding toward the solenoid body 3 at the center of the closed surface. A spring receiving seat 10A is provided on the inner periphery of the guide hole 10 on the outer peripheral side of the valve body 5, and a spring 12 is inserted in contact with the spring. An annular spring stopper 13 is provided between the base of the small-diameter projection 51 and the inner peripheral wall of the guide hole 10 so as to be fitted to the small-diameter projection 51 in order to suppress the spring 12. 13
Is fixed. Further, a valve stopper 15 is provided on the projecting portion 51 of the small diameter portion, and the guide hole 1 is used to fix the valve body 5 at a predetermined position by the valve stopper 15.
It is press-fitted and fixed to the inner circumference. At this time, spring 1
2 is in a compressed state, and the spring 12 urges the valve body 5 toward the solenoid body 3 via the spring stopper 13.

On the other hand, the valve seat 6 has a stepped portion 10B having one end provided on the inner periphery of the guide hole 10 of the valve housing 9.
, And is fitted and fixed to the inner periphery of the guide hole 10 so that the other end protrudes from the wall surface of the port 8. A hole 16 through which the valve body 5 can be inserted and removed is dug down in a portion facing the valve seat 6. The hole 16 is circular and has an inner diameter slightly larger than the outer diameter of the valve body 5. The hole bottom 17 is a flat surface orthogonal to the central axis. When the valve is closed, the flat end surface of the valve body 5 comes into close contact with the hole bottom 17 and closes the flow path 7. . The inner peripheral wall 18 of the hole 16 is a cylindrical surface extending parallel to the central axis.

The corner of the opening end of the hole 16 of the valve seat 6 is formed into an inverted conical tapered surface 19 which is chamfered and gradually narrowed inward in the radial direction. Grooves 20 are formed on all sides of the tapered surface 19 in a range from the end on the port 8 side to a part of the inner peripheral wall 18. At this time, the depth D of the groove 20 is set at a position H where the valve body 5 is balanced by the fluid force applied when the valve body 5 is closed and the spring 12, as shown in the related art, from the end face of the valve body 5. Downstream H1,
That is, it is effective to take up to the hole bottom 17 side.

In this embodiment, the tapered surface 19 is formed by chamfering a straight line. However, the tapered surface 19 may be formed in a tapered shape, and is formed by a smooth curved surface such as a rounded arc shape or a streamline shape. You may make it.

The angle of the tapered surface 19 is approximately 45 degrees in this embodiment. However, it is not limited to around 45 degrees, but the hole diameter, the size of the flow path 7, the type of the control fluid,
The optimum angle, shape and the like are selected according to various conditions such as viscosity and pressure. Similarly, the shape of the groove 20,
The number, the position, and the like are such that the optimum shape and the like are selected according to the above conditions.

Here, the solenoid body 3 for reciprocatingly driving the valve body 5 will be described. In the solenoid body 3, a solenoid 22 is housed in a case 21 having the valve insertion hole 4 at the bottom, and a thin cylinder 23 having a U-shaped cross section is fitted and fixed to the inner periphery of the solenoid 22. A plunger 24 is mounted movably in the center axis direction on the inner periphery of the cylinder 23, and a center post 25 as a cylindrical fixed iron core having an outward flange portion 25A facing the plunger 24 has an outward flange. The part 25A is fitted and fixed by engaging with the step part of the valve insertion hole 4.
On the other hand, a rod 26 is inserted into the inner periphery of the center post 25 in a reciprocating manner, and one end of the rod 26 is connected to the solenoid body 3.
And the other end thereof is in contact with a small-diameter projection 51 of the valve body 5.

The solenoid valve 1 operates as follows.

It is assumed that the fluid flows in from the port 8 of the valve housing 9 and out of the flow path 7.

First, when the valve is closed, the solenoid 22 is energized, the plunger 24 is attracted to the center post 25 by the electromagnetic attraction force, and the plunger 24 moves toward the center post 25 against the spring force of the spring 12. I do.
As the plunger 24 moves, the valve body 5
The tip of the valve body 5 enters the hole 16 of the valve seat 6 via the rod 26, and is closely contacted with the hole bottom 17 so that the flow path 7 is completely closed.

Here, in a state where the distal end portion of the valve body 5 partially enters the hole 16 of the valve seat 6 without closing the valve yet, fluid flows into the tapered surface 19 at the upper end of the opening of the hole 16.
Flows into the hole 16 along the flow path, is narrowed by the gap between the inner peripheral wall 18 of the hole 16 and the outer peripheral wall 52 of the valve body 5, and flows through the flow path 7, so that fluid force is generated in a direction to close the valve body 5. The added valve closing operation is performed reliably.

In the portion where the groove 20 is provided, there is an uncut inner peripheral wall 18, and a narrowed portion is formed by a gap between the inner peripheral wall 18 and the outer peripheral wall 52 of the valve body 5. Therefore, there is no problem with the valve closing operation.

Next, when the valve is opened, the solenoid 22
Is not energized, and the valve body 5 is separated from the hole bottom 17 of the valve seat 6 by the spring force of the spring 12 to open the valve. At this time, in the prior art, there was a state where the fluid force at the time of closing the valve and the spring force of the spring 12 were balanced and the valve could not be fully opened. In this case, in the present invention, since the groove 20 is provided in a range that partially extends from the tip of the tapered surface 19 at the opening end of the hole 16 to the inner peripheral wall 18 of the hole 16, the flow in the groove 20 is in the axial direction of the valve body 5. , And a fluid force acts in a vertical direction on a gap between the end face of the valve body 5 and the hole bottom of the valve seat 6,
Since the force is a component of the force in the valve opening direction of the valve main body 5, the valve main body 5 is reliably opened, and stability can be achieved.

In the above-described embodiment, an example in which the solenoid body 3 is used as the driving means for the valve body 5 has been described. However, the means for driving the valve body 5 is not limited to the solenoid body 3 and other means. The same applies to those utilizing fluid pressure such as hydraulic pressure.

Although the flow direction of the fluid has been described from the case where the fluid flows from the port 8 of the valve housing 9 to the flow path 7, the flow may be made to flow from the flow path 7 toward the port 8. .

[0027]

Since the present invention has the above-described configuration and operation, the flow of the passage portion when the valve is opened is restricted by the passage provided in a range from the tip of the tapered surface to a part of the inner peripheral wall of the hole. Flow in the direction perpendicular to the axial direction of the valve, and the fluid force acts in the direction perpendicular to the gap between the distal end face of the valve body and the bottom of the valve seat to open the valve reliably, and the stability of the opening and closing characteristics is improved. I can do it.

In a portion where the passage of the inner peripheral wall of the hole is not provided, a throttle portion due to a gap remains between the inner peripheral wall and the outer peripheral wall of the valve body, so that a fluid force is applied when the valve body is closed. The closing of the valve body is also performed reliably.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a valve structure according to an embodiment of the present invention.

2 (a) is an overall longitudinal sectional view of a solenoid valve to which the valve structure of FIG. 1 is applied, and FIG. 2 (b) is a front view showing a groove position of a valve seat of the valve structure.

FIG. 3 is a longitudinal sectional view of a main part of a conventional valve structure.

4 is an overall longitudinal sectional view of a solenoid valve to which the valve structure of FIG. 3 is applied.

[Description of Signs] 1 Solenoid valve 2 Valve section 3 Solenoid main body 4 Valve insertion hole 5 Valve (valve element) 51 Projection section 52 Outer peripheral wall 6 Valve seat (valve seat) 7 Flow path 8 Port 9 Valve housing 10 Guide hole 10A Spring Receiving seat 10B Step 11 Bearing 12 Spring 13 Spring stopper 14 Push nut 15 Valve stopper 16 Hole 17 Hole bottom 18 Inner peripheral wall 19 Tapered surface 20 Groove (passage) 21 Case 22 Solenoid 23 Cylinder 24 Plunger 25 Center post 25A Outward flange portion 26 rod

Claims (1)

(57) [Scope of request for utility model registration] A guide hole is provided in a valve housing having a port, a valve seat and a valve body are provided on the inner periphery of the guide hole, and the valve body is brought into contact with and separated from the valve seat to open a flow passage opened in the valve seat. A valve opening and closing the valve seat, the portion of the valve seat facing the valve body is provided with a hole through which the valve body can be taken in and out, an inner peripheral wall extending substantially parallel to the axis of the valve body, and an opening end of the inner peripheral wall; A valve configured by a tapered surface having a tapered corner portion and a hole bottom where the flow path opens, and a valve in which fluid flows between the port and the flow path through the hole, from a tip of the tapered surface. A valve provided with a passage through which fluid can flow in a part of the inner peripheral wall.