JPH03125086A - Stator supporting mechanism of solenoid valve - Google Patents

Abstract

PURPOSE:To prevent displacement of a stator to be caused by pressurizing by gradually shortening the bilateral magnetic plates in a horizontal direction than the center one, making the front and back ends of the stator circular arc form, and supporting the magnetic plates ends on a shim. CONSTITUTION:A center plate 12 is longest among magnetic plates and bilateral plates 11 are gradually shortened. When the magnetic plates 11 and 12 are connected and fixed to each other, back and forth ends 1a, 1b of a stator 1 form circular arc. Curvature of the circular arc faces is the same as that of a cylindrical shim 2 which is in contact to lower faces of the ends 1a, 1b and supports them. Thus, the plate ends of whole of the magnetic plates 11, 12 are in contact to the cylindrical surface of the shim 2 and thereby supported. The magnetic plates 11, 12 are prevented from projectingly moving therefore, even when the lower projecting force is applied thereto because of distortion of a valve housing 6 or solenoid attraction force. Displacement of the stator 1 is prevented, and change of valve responsiveness and valve stroke is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] 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 constructed 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 forming the flow channels E1 and E2, and a cylindrical outer valve 41 is inserted into the center hole thereof so as to be movable up and down. An inner valve 43 consisting of a pair of upper and lower rods that abut each other is disposed inside the cylinder of the outer valve 41, and the outer valve 41, which is pushed downward by the coil spring 44, causes the flow to flow through the valve internal flow path 411. Roads 51 and 52 are in communication. By energizing the electromagnetic coil 3, which will be described later, the outer valve 41 has an inner circumferential step that is connected to the inner valve 4.
3, the channels 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.
It is located within the space formed by.

A cylindrical valve housing 6 that opens downward is provided over the shim 2, and the stator 1 is housed within the housing 6. As shown in FIGS. 4 and 5, the stator 1 is made up of a large number of E-shaped magnetic plates 11 and 12 with rivet insertion holes 13 in two places, which are stacked horizontally and combined into a rectangular parallelepiped shape as a whole. Grooves 14 are formed at two locations in the lower half to cross this. The above magnetic plate 1
1.12 is such that the central plate 12 forming the through hole 121 into which the upper half of the inner valve 43 is inserted is thick, and the other plates 11 are of the same thickness but thin. The electromagnetic coil 3 is wound around the outer periphery of a rectangular cylindrical coil bobbin 31, and the coil bobbin 31 is fitted into the groove 14 of the stator 1.

The valve housing 6 in which the electromagnetic coil 3 and the stator 1 are installed in this manner has an opening end surface in contact with the cylindrical end surface of the shim 2, and constitutes an outer periphery of the electromagnetic valve that is flush with the shim 2 and the valve body 5. . In this state, the stator 1
As shown in the figure, the four corners of the shim 2 are in contact with and supported on the cylindrical end surface of the shim 2.

[Problems to be Solved by the Invention] By the way, in the above-mentioned conventional solenoid valve, the valve body 5
In order to fluid-tightly press the valve housing 6 against the wall surface of the device E, the shoulder of the valve housing 6 is often pressed downward as shown by the arrow in FIG.
-6575), at this time, the valve housing 6
This causes distortion.

Here, as mentioned above, the stator 1 has four corners on the shims 2, but the middle part is only connected with rivets and is not supported by the shims 2, and as a result, the magnetic bodies at the left and right ends are A problem arises in that the magnetic plates 11 and 12 in the intermediate portion other than the plate 11 protrude downward.

The results of measuring this with a surface roughness meter are shown in FIG. 6, where the horizontal axis of 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 1. According to experiments conducted by the inventors, the maximum displacement amount reaches approximately 10 μm, and the air gap between the lower surface of the stator 1 and the upper surface of the armature 42 (normally designed value is approximately 20 μm)
This causes a problem in that the desired switching response of the solenoid valve cannot be obtained. Furthermore, inner valve 4
3 is fixed to the stator 1, the inner valve 4
3 is also displaced downward, causing a problem that the valve opening varies.

The above problem is noticeable when pressing the valve housing 6, but when the electromagnetic coil 3 is energized, each magnetic plate 11.1
This is also caused by a downward suction force acting on the armature 2.

SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and it is an object of the present invention to provide a stator support structure for a solenoid valve that effectively prevents protruding displacement of the magnetic plates constituting the stator.

[Means for Solving the Problems] To explain the present invention in detail, the stator 1 around which the electromagnetic coil 3 (FIG. 1) is wound is constructed by laminating a plurality of magnetic plates 11 and 12 in the horizontal direction. , a valve body 41 adjacent to its lower surface.
(Fig. 3), the magnetic plates 11 and 12 are arranged so that the length of the magnetic plates 11 and 12 is gradually shortened in the left and right direction from the one at the horizontal center position. The direction ends 1a and 1b are formed in an arc shape,
The lower surfaces of the front and back ends 1a and 1b are
It is placed on the cylindrical end surface of a cylindrical shim 2 having the same curvature as b, and the plate ends of all the magnetic plates 11, 12 are supported on the shim 2.

[Function] In the support structure configured as described above, the lower surfaces of the front and rear end portions 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 Since it is supported on the shim 2, even if a downward protruding force acts on the magnetic plate 11.12 due to distortion of the valve housing 6 or electromagnetic attraction force, the magnetic plate 11.12 will protrude and move. There's nothing to do. Thus, displacement of the stator 1 is prevented, and fluctuations in valve responsiveness and valve stroke are avoided.

[Example] Fig. 1 is a cross-sectional view taken along the line II in Fig. 3 described above, showing a longitudinal cross-section of the entire electromagnetic valve, and Fig. 2 is a perspective view of the stator.

In FIG. 2, the stator 1 is an E-shaped magnetic plate 11.1.
2 are stacked horizontally, and the central magnetic plate 12 is provided with a through hole 121 in which the upper half of the inner valve 43 is located.
is thick, and the magnetic plates 11 laminated on the left and right positions are thin and have the same thickness. The plate length of the magnetic plates 11 and 12 is such that the plate 12 located at the central position is the longest, and each plate 11 located laterally from this is gradually shortened. The other structure is the same as the conventional example.

Thus, with the magnetic plates 11 and 12 connected and fixed by rivets passed through the rivet insertion holes 13, the ends 1a and 1b of the stator 1 in the front-rear direction are, as shown in FIG. forms an arc. The curvature of this arcuate surface is determined by the cylindrical shims 2 that touch and support the lower surfaces of the ends 1a and 1b.
The curvature is the same as that of the shim 2, and thus the end portions of all the magnetic plates 11, 12 are supported in contact with the cylindrical end surface of the shim 2.

According to this support structure, the magnetic plates 11 and 12 are caused by the distortion of the valve housing 6 or by the electromagnetic attraction force.
Even if a downward protruding force acts on the magnetic plate 11.1,
2 is supported by shim 2 at both ends, so
No protruding movement of the stator 1 occurs.

[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 shims. The magnetic plate does not protrude and displace due to distortion of the housing due to pressure or the attractive force of the electromagnetic coil, and displacement of the stator is prevented, thereby avoiding fluctuations in valve responsiveness and valve stroke.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, FIG. 1 is a horizontal sectional view of a valve housing in which a stator is installed, FIG. 3 is a sectional view taken along line I-I in FIG. is a perspective view of the stator, FIG. 3 is a vertical sectional view of the entire electromagnetic valve, FIGS. 4 to 6 show conventional examples, FIG. 4 is a horizontal sectional view of the valve housing in which the stator is installed, and FIG. 5 6 is a perspective view of the stator, and FIG. 6 is a diagram showing the amount of protrusion displacement of the magnetic plate. 1... Stator 1a, 1b... Anteroposterior end portion 11.12... Magnetic plate 2... Shim 3... Electromagnetic coil 41... Outer valve (valve body) 42... Armature No. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In an electromagnetic valve in which a stator with an electromagnetic coil wound thereon is constructed by laminating a plurality of magnetic plates in a horizontal direction, and an armature integrated with a valve body is disposed close to the lower surface of the stator, the magnetic plates are horizontally stacked. The front and rear ends of the stator are formed into an arc shape by gradually shortening the plate length in the left and right direction from the one at the center position, and the lower surface of the front and rear ends is formed with a cylindrical shim having the same curvature as the end. A stator support structure for a solenoid valve, characterized in that the stator is placed on the cylindrical end surface of the shim, and the plate ends of all the magnetic plates are supported on the shim.