JP2705248B2 - Stator support structure for solenoid valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a stator support structure for an electromagnetic valve, and more particularly to a support structure for preventing displacement of a stator formed by laminating a plurality of magnetic plates.

[Prior Art] FIG. 3 shows an example of an electromagnetic three-way valve. The cylindrical valve body 5 is brought into close contact with the wall surface of the device E in which the flow paths E1 and E2 are formed, and a cylindrical outer valve 41 is inserted in the center through hole so as to be vertically movable. An inner valve composed of a pair of upper and lower rods abutting on each other is provided in the cylinder of the outer valve 41.
43 is disposed, and the ita valve 41 pushed down by the coil spring 44 causes the valve internal flow path 41
The channels 51 and 52 communicate with each other via 1. When the outer valve 41 is raised by energizing the electromagnetic coil 3 described later until its inner peripheral step comes into contact with the tip of the inner valve 43, the flow paths 51 and 53 communicate with each other.

A thick disk-shaped armature 42 is fixed to the outer periphery of the upper end of the outer valve 41, and the armature 42 is formed by a non-magnetic cylindrical shim 2 arranged on the outer periphery of the top surface of the valve body 5. Located in space.

A valve housing 6 in the form of a cylindrical container that opens downward is provided on the shim 2, and the stator 1 is housed in the housing 6. The stator 1 is shown in FIGS.
As shown in the figure, a large number of E-shaped magnetic plates 11 and 12 having rivet insertion holes 13 provided at two locations are horizontally laminated and joined as a whole in a rectangular parallelepiped shape. A groove 14 that crosses this is formed. The magnetic plates 11, 12
Is a through hole 121 into which the upper half of the inner valve 43 is inserted.
The central plate 12 on which is formed a thick wall, and the other plates 11 have the same thickness and a thin wall. The electromagnetic coil 3 is a rectangular cylindrical coil bobbin
The coil bobbin 31 is wound around the outer periphery of the stator 31 and fitted into the groove 14 of the stator 1.

In this manner, the valve housing 6 in which the electromagnetic coil 3 and the stator 1 are provided has an opening end surface in contact with the cylindrical end surface of the shim 2 and forms an outer periphery of the electromagnetic valve flush with the shim 2 and the valve body 5. . In this state, as shown in FIG. 4, the stator 1 has four corners abutting and supported on the cylindrical end surface of the shim 2.

[Problems to be Solved by the Invention] Incidentally, in the above-mentioned conventional solenoid valve, in order to press-fit the valve body 5 to the wall surface of the device E in a liquid-tight manner, a valve as shown by an arrow in FIG. In many cases, the shoulder of the housing 6 is pressed downward (for example, see Japanese Unexamined Patent Publication No.
At this time, the valve housing 6 is distorted. Here, as described above, the stator 1 has four corners on the shim 2, but the middle portion is connected only by rivets and is not supported by the shim 2.
Magnetic plates 11, 12 in the middle except for the magnetic plates 11 at the left and right ends
Is displaced downwardly.

FIG. 6 shows the result of specifying this with a surface roughness meter. The horizontal axis in the figure is the measurement position between points A and B in FIG. 4, and the upper part of the vertical axis is the protrusion displacement. According to experiments by the inventors, the maximum displacement amount reached about 10 μm, and the lower surface of the stator 1 and the armature
The air gap on the upper surface 42 (usually the designed value is about 20 μm) varies greatly, causing a problem that a desired solenoid valve switching response cannot be obtained. Further, in the structure in which the inner valve 43 is fixed to the stator 1, there is a problem that the inner valve 43 is also displaced downward, so that the valve opening varies.

The above problem is remarkable when the valve housing 6 is pressed, but when the electromagnetic coil 3 is energized, the magnetic plates 11, 12
This also occurs when a downward suction force acts on the armature 42 at the same time.

Accordingly, an object of the present invention is to solve such a problem, and an object of the present invention is to provide a stator support structure of an electromagnetic valve that effectively prevents a projecting displacement of a magnetic plate constituting a stator.

[Means for Solving the Problems] To explain the configuration of the present invention, an electromagnetic coil 3 (FIG. 1)
The stator 1 is formed by laminating a plurality of magnetic plates 11 and 12 in a horizontal direction, and an armature 42 integral with a valve body 41 (FIG. 3) is arranged near the lower surface thereof. In the valve, the magnetic plates 11 and 12 are gradually shortened in the left-right direction as compared with those at the center position in the horizontal direction so that the stator 1
The front and rear ends 1a and 1b are formed in an arc shape, and the lower surfaces of the front and rear ends 1a and 1b are placed on the cylindrical end surface of the cylindrical shim 2 having the same curvature as the ends 1a and 1b. The plate ends of all the magnetic plates 11 and 12 are supported on the shim 2.

[Operation] In the support structure having the above configuration, the lower surfaces of the front and rear ends 1a and 1b of the stator 1 formed in an arc shape are placed on the cylindrical end surface of the shim 2, and the plate ends of all the magnetic plates are set. Because it was supported on the shim 2, due to the distortion of the valve housing 6,
Alternatively, even if the magnetic plates 11 and 12 have a downwardly protruding force due to the electromagnetic attraction, the magnetic plates 11 and 12 do not protrude and move. However, displacement of the stator 1 is prevented,
Variations in valve responsiveness and valve stroke are avoided.

[Example] FIG. 1 is a transverse sectional view taken along line II in FIG. 3 showing the longitudinal section of the entire solenoid valve, and FIG. 2 is a perspective view of a stator.

In FIG. 2, the stator 1 has E-shaped magnetic plates 11 and 12.
In the horizontal direction, the magnetic plate 12 in the center provided with the through hole 121 in which the upper half of the inner valve 43 is located is made thick, and the magnetic plate 11 laminated in the left and right positions is made the same thickness and thin. is there. The plate length of the magnetic plates 11 and 12 is the longest of the plate 12 at the center position, and the plates 11 positioned in the left and right directions are gradually reduced in plate length. Other structures are the same as the conventional example.

Then, the magnetic plates 11 and 12 are inserted into the rivet insertion holes.
In the state where the stator 1 is connected and fixed by the rivets passed through 13, the front and rear ends 1a and 1b of the stator 1 have an arc shape in plan view as shown in FIG. The curvature of this arc surface is the ends 1a, 1b
The curvature is the same as that of the cylindrical shim 2 that contacts and supports the lower surface of the shim 2. Thus, the plate ends of all the magnetic plates 11, 12 are supported by contacting the cylindrical end surfaces of the shim 2.

According to such a support structure, even if a downward projecting force acts on the magnetic plates 11 and 12 due to the distortion of the valve housing 6 or the electromagnetic attraction force, all of the magnetic plates 11 and 12 can be used. Since the both ends are supported by the shim 2, the projecting movement of the stator 1 does not occur.

[Effects of the Invention] As described above, the stator support structure of the present invention changes the shape of the stator so that the plate ends of all the magnetic plates constituting the stator are supported on the shim. The magnetic plate does not protrude and displace due to the distortion of the housing due to the pressing or the attractive force of the electromagnetic coil, and the displacement of the stator is prevented, so that the valve responsiveness and the fluctuation of the valve stroke are avoided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 show an embodiment of the present invention. FIG. 1 is a horizontal sectional view of a valve housing in which a stator is provided. 2 is a perspective view of the stator, FIG. 3 is an overall vertical sectional view of the solenoid valve, FIGS. 4 to 6 show a conventional example, and FIG. 4 is a view of a valve housing in which the stator is provided. FIG. 5 is a perspective view of a stator, and FIG. 6 is a view showing the amount of protrusion displacement of a magnetic plate. DESCRIPTION OF SYMBOLS 1 ... Stator 1a, 1b ... Front and rear end part 11, 12 ... Magnetic plate 2 ... Shim 3 ... Electromagnetic coil 41 ... Outer valve (valve element) 42 ... Armature

Claims (1)

(57) [Claims] An electromagnetic valve having a stator in which an electromagnetic coil is wound and having a plurality of magnetic plates laminated in a horizontal direction, and an armature integrated with a valve element disposed close to a lower surface thereof. The length of the magnetic plate is gradually reduced in the left-right direction as compared with the magnetic plate located at the center in the horizontal direction, and the end of the stator in the front-rear direction is formed in an arc shape. A stator support structure for an electromagnetic valve, wherein the plate end portions of all the magnetic plates are supported on the shim by being placed on the cylindrical end surface of a cylindrical shim having a curvature.