JPH0544621Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a solenoid valve used, for example, as a control valve of a hydraulic control device, and particularly relates to the structure of a control fluid flow path.

(Prior Art) Conventionally, as this type of solenoid valve, one shown in FIG. 4, for example, is known.
In this solenoid valve 100, an inner port 102 is provided inside a cylindrical base 101, and the control fluid is passed through a second flow path formed between the base 101 and the inner port 102.
03a into the valve chamber 104, and further formed at the center of the inner port 102.
03b.

When the valve is closed, the solenoid 105
By energizing, the plunger 106 is attracted toward the inner end 102c of the inner port, and the tip of the rod 106a fixed to the plunger 106 enters the hole of the valve chamber 108, opening the first flow path 103b.
is configured to be occluded.

Here, in the above conventional example, as shown in FIG.
2a and 102b are provided, and a second flow path 103a is formed from these and the inner peripheral surface of the base 101.

(Problem to be Solved by the Invention) However, in such a conventional example, flat parts 102a and 102b are provided on the inner port 102, which should originally be in contact with the entire inner peripheral surface of the base 101, to form the second flow path 103a. As a result, the contact area between the inner port 102 and the base 101 is reduced, and as a result, especially these flat parts 1
Inner port 1 in the vertical direction of 02a, 102b
02 tends to tilt. When this inclination occurs, the valve seat 108 is inclined with respect to the rod 106a, creating a gap between them, resulting in a problem in that the sealing ability when the valve is closed is reduced.

In addition, the magnetic flux generated in the solenoid 105 is
Plunger 106 → Inner port inner end 102
The magnetic flux flows through the path c→inner port 102→base 101→plunger 106, but this distance is quite long and there are many intervening members, so leakage magnetic flux increases.As a result, there is a problem that the suction efficiency of the solenoid 105 is poor. Ta.

Therefore, the present invention was devised to solve the above problems of the prior art, and its purpose is to securely fix the member for holding the valve seat and forming the first flow path, Another object of the present invention is to provide a solenoid valve that can increase the suction force of the solenoid and improve the sealing ability when the valve is closed.

(Means for solving the problem) In order to achieve the above purpose, in the present invention,
A port member having a valve seat provided at its inner end and forming a first flow path communicating with the valve chamber via the valve seat is held so as to be surrounded by a base member, and the above-mentioned A solenoid valve that forms a second flow path communicating with the valve chamber and opens and closes the flow path by moving a valve body fixed to a movable core toward and away from the valve seat using the electromagnetic attraction force of the solenoid, The base member is extended closer to the movable iron core than the port member so that a magnetic path passes between the base member and the movable iron core, and the second flow path is formed in the base member. It is characterized by

(Function) In the present invention having the above configuration, since the flow path is formed in the base member surrounding the port member, when the flow path is formed by processing the port member in which the first flow path has already been formed, the flow path is formed. Compared to this, the cross-sectional shape of the flow path can be freely selected. Therefore, for example, by making the cross-sectional shape approximately circular, it is possible to increase the contact area between the inner circumferential surface of the base member and the outer circumferential surface of the port member.

Further, since the base member is extended closer to the movable core than the port member, the magnetic flux from the movable core when the solenoid is energized immediately flows to the base member without passing through other members. Therefore, the distance through which the magnetic flux flows is shortened, and the number of joints in the magnetic flux flow path is reduced, so that leakage of the magnetic flux is reduced.

(Example) Hereinafter, the present invention will be explained based on the illustrated example.

1 to 3 show an embodiment of a solenoid valve according to the present invention, and FIG. 3 shows its overall configuration.

In the figure, 1 indicates the entire valve,
A base 2 serving as a substantially cylindrical base member, and a solenoid 3 integrally assembled to this base 2.
It is composed of.

The solenoid 3 is housed in a cylindrical case 4, and the base 2 is assembled to one end surface. A plunger 5 is attached to the cylinder 3a on the inner periphery of the solenoid 3 so as to be movable in the direction of the central axis. Further, the base 2 integrally bulges out within the cylinder 3a so as to be close to the plunger 5, and its extension portion 2a is fixed to the inner circumferential wall of the cylinder 3a. A cylindrical inner port 6 is fixed concentrically to the inner periphery of the base 2,
A valve chamber 7 is formed by the inner wall of the base 2 and the inner port 6. The extension portion 2a of the base 2 extends closer to the plunger 5 than the inner port 6.

An annular bearing 1 is provided on the inner periphery of the extension portion 2a of the base 2.
0 is provided, and a rod 9 serving as a valve body, one end of which is fixed to the plunger 5, is connected to this bearing 10.
is guided and held movably in the central axis direction by
It is adapted to be inserted into the valve chamber 7. on the other hand,
A valve seat 11 is provided at the inner end of the inner port 6, facing the rod 9.

And between the plunger 5 and the bearing 10,
A spring 12 is mounted in a compressed state and constantly urges the rod 9 away from the valve seat 11. The rod 9 also includes an introduction passage 13 for introducing the control fluid in the valve chamber 7 into the inner circumferential side of the solenoid 3.
is provided.

A first flow path 14 is formed in the inner port 6 and extends along its central axis to the valve chamber 7 . On the other hand, on the inner periphery of the base 2, a second flow path 15 is formed vertically in parallel with the first flow path in between. Note that 16 is a connection terminal for energizing the solenoid 3, and 17 is a sealing member for sealing the valve mounting portion.

FIG. 1 shows an enlarged view of the main parts of this embodiment.

As shown in FIG.
The flow path 15 includes a horizontal hole 15a extending in the axial direction and a vertical hole 15b extending in the circumferential direction and penetrating toward the valve chamber 7. The horizontal hole 15a has a slightly chipped full moon shape as shown in FIG. 2a, and extends from the base 2 toward the extension 2a to the valve chamber 7. On the other hand, the vertical hole 15b is formed to communicate with the horizontal hole 15a, as shown in FIG. 2b. Here, the two openings formed in the extension 2a by the vertical holes 15b are sealed by attaching the cylinder 3a to the base 2. In that case, as a method for joining the cylinder 3a to the base 2, a conventionally used brazing method is used.

A hole 20 is dug in the valve seat 11 at a portion facing the rod 9, through which the rod 9 can be taken in and taken out. The hole 20 is circular and has an inner diameter slightly larger than the outer diameter of the rod 9. The hole bottom 21 is a flat surface perpendicular to the central axis, and when the valve is closed, the end surface of the rod 9, which is also flat, comes into fluid-tight contact to close the first flow path 14. .

The above solenoid valve operates as follows. It is assumed that the control fluid flows in from the second flow path 15 and flows out from the first flow path 14.

First, when the valve is opened, the solenoid 3 is not energized and the rod 9 is held in the open state away from the valve seat 11 by the spring force of the spring 12. Therefore, the control fluid flows through the second flow path 15
It flows into the valve chamber 7 through the valve chamber 7 and flows out through the first flow path 14 .

Next, when the valve is closed, the solenoid 3 is energized, the plunger 5 is attracted toward the extension part 2a of the base 2 by electromagnetic attraction force, and the plunger 5 is moved toward the extension part 2a against the spring force of the spring 12. Move to 2a side. Along with this movement of the plunger 5,
The rod 9 moves toward the valve seat 7, and the tip of the rod 9 enters the hole 20 of the valve seat 11 and comes into close contact with the hole bottom 21, completely blocking the first flow path 14.

In the embodiment having the above configuration and operation, since the second flow path 15 of the base 2 is formed, the contact area between the inner circumferential surface of the base 2 and the outer circumferential surface of the inner port 6 is reduced compared to the conventional example. The inner port 6 can be made larger, and the inclination of the inner port 6 can be made smaller. Therefore, the gap created between the valve seat 11 and the rod 9 can be reduced, and the sealing ability when the valve is closed can be improved.

In addition, since the base 2 is integrally bulged so as to be close to the plunger 5, the flow of magnetic flux when the solenoid 3 is energized is as follows: plunger 5 → base 2 →
The case 4 becomes the plunger 5, the distance through which the magnetic flux flows is reduced, and the suction efficiency of the solenoid 3 is improved. Furthermore, since the number of joints in the magnetic flux flow path is reduced compared to the conventional example, the flow of magnetic flux is reduced, and the attractive force of the solenoid 3 is increased.

Furthermore, the second flow path 15 can be formed by simply drilling holes in the base 2, and the vertical hole 15b can be sealed by brazing the cylinder 3a to the base 2 as in the conventional example. , it also has the effect of improving productivity.

In the above embodiment, the cross-sectional shape of the second flow path is approximately circular, but it may have another shape, and the number and position of the second flow path may also be changed in various ways.

In addition, as for the flow direction of the fluid, the second flow path 15
The case where the flow is directed from the first flow path 14 to the first flow path 14 has been described, but conversely, from the first flow path 14 to the second flow path 15
It may also flow toward the side.

(Effects of the invention) In the present invention having the above configuration and operation, since the second flow path is formed in the base member,
The inclination between the base member and the port member can be reduced, and as a result, the sealing ability when the valve is opened can be improved.

Additionally, since the base member is extended closer to the movable core than the port member, and the magnetic path passes between the base member and the movable core, leakage of magnetic flux is reduced and the attraction force of the solenoid is improved. can.

[Brief explanation of the drawing]

FIG. 1 is an enlarged longitudinal cross-sectional view showing the main parts of one embodiment of the solenoid valve according to the present invention, and FIG.
A view of the solenoid valve shown in the c direction, Fig. 2b
is a sectional view taken along line B-B of the solenoid valve in Fig. 1,
FIG. 3 is a longitudinal sectional view showing the overall structure of the same embodiment, FIG. 4 is a longitudinal sectional view showing the overall structure of a conventional solenoid valve, and FIG. 5 is a front view of the conventional solenoid valve. Explanation of symbols, 2...Base (base member), 2
a...Bulging part, 3...Solenoid, 3a...Cylinder, 5...Plunger (movable iron core), 6...Inner port (port member), 7...Valve chamber, 9...
...Rot (valve body), 11...Valve seat, 14...1st
Channel, 15...Second channel, 15a...Horizontal hole, 15
b...Vertical hole.

Claims (1)

[Claims for Utility Model Registration] A base member surrounds and holds a port member which is provided with a valve seat at its inner end and forms a first flow path communicating with a valve chamber via the valve seat, and which A second flow path communicating with the valve chamber is formed between the port member and the base member, and the valve body fixed to the movable core is moved toward and away from the valve seat using the electromagnetic attraction force of the solenoid. In the solenoid valve that opens and closes the first flow path, the base member is extended closer to the movable iron core than the port member, so that a magnetic path passes between the base member and the movable iron core, and the second A solenoid valve characterized in that a flow path is formed in the base member.