JPH11108231A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hasten responding time of a movable part by forming a shaft of a fixing core made of a magnetic material in such a way that an electromagnetic steel plate of a rectangular cross section provided with an insulating film on both surfaces and an electromagnetic steel plate of triangular or a trapezoidal cross section are laminated with each other, and they are formed in a rod shape. SOLUTION: This solenoid valve is provided with bodies 8, 9 made of a non-magnetic material, a fixing core 10 fixed to the body 8, an electric coil 12 for supplying magnetic flux to the fixing core 10, a diaphragm 5 whose outer peripheral part is fixed between bodies 8, 9. and a movable part 1 which is supported to the diaphragm 5 and arranged opposing to the fixing core 10. The fixing core 10 is formed by assembling a base 6 made of a magnetic material and a shaft 7 made of a magnetic material with each other, the shaft 7 made of the magnetic material is formed in such a way that electromagnetic steel plates of a rectangular cross section provided with an insulating film on both surfaces are laminated with each other, and they are formed in a rod shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve used for opening and closing a fluid passage for intake of an automobile engine.

[0002]

2. Description of the Related Art Recently, a solenoid valve which opens and closes a fluid passage depending on a load state of an engine for the purpose of regulating exhaust gas emissions and improving fuel efficiency of automobiles has been developed from the viewpoint of higher control accuracy and transient control. A product with a fast response has been desired. 2. Description of the Related Art Conventionally, as this type of solenoid valve, for example, a solenoid valve disclosed in Japanese Utility Model Laid-Open No. 1-96584 is known.

As shown in FIG. 7, a movable portion 1 serving as a valve body of this solenoid valve has a cup-shaped first member 2 having a flanged portion with a hole in the center, Second member 3 made of an elastic material formed on the flange portion
And a cylindrical third member 4 made of a magnetic material coupled to a lower end of the first member 2 for electrically moving the valve body to open and close the valve. The cup-shaped outer peripheral portion of the one member 2 penetrates the center portion of the diaphragm 5 and is connected to the inner peripheral portion of the third member 4 to hold the diaphragm 5 and move the movable portion 1 in the thickness direction of the diaphragm 5. It is designed to be displaced. That is,
The movable part 1 located below the valve seat 16 can be brought into contact with or separated from the fixed valve seat 16.

In the example shown in FIG. 7, the electric coil is in a non-energized state, the movable part 1 is in contact with the valve seat 16 and the valve is closed. Further, a third cylindrical member made of a magnetic material is used.
A cylindrical fixed core 10 having a flange at the lower end is located below the member 4, and a compression coil spring 22 is inserted between the third member 4 and the fixed core 10.

In the conventional solenoid valve having such a structure, when the electric coil 12 is energized and excited, a magnetic circuit is formed by the fixed core 10, the coil cover 17, the plate 23 and the cylindrical third member 4, and the cylindrical circuit is formed. When a suction force due to magnetic flux is generated between the third member 4 and the fixed core 10 and the suction force is larger than the reaction force of the compression coil spring, the cylindrical third member 4 is pulled by the fixed core 10 and moves downward. The movable unit 1 is separated from the valve seat 16 to open the valve.

[0006]

However, the conventional solenoid valve has a fixed core 1 having a flange at the lower end as described above.
Since 0 is a part of the magnetic material, the eddy current due to the electromagnetic induction causes the eddy current due to the electromagnetic induction to be in a cylindrical shape when the magnetic flux at the start of energization to the electric coil 12 is increased or the magnetic flux at the time of energization cutoff is reduced. The movable portion 1 is formed inside the shaft portion, acts to prevent an increase or decrease of magnetic flux, and has a response time until the movable portion 1 separates from the valve seat 16 and opens the valve. There is a problem that the response time from contact with the valve seat 16 away from the valve seat 10 until the valve is closed becomes long.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has a structure in which a shaft of a fixed core made of a magnetic material is formed by:
It is an object of the present invention to provide a solenoid valve capable of accelerating the response time of a movable part by laminating, bonding and fixing electromagnetic steel sheets having rectangular cross sections each having an insulating film on both sides to form a rod.

More specifically, the first aspect of the invention relates to a solenoid valve, which comprises non-magnetic bodies 8, 9, a fixed core 10 fixed to the body 8, an electric coil 12 for supplying a magnetic flux to the fixed core 10, In a solenoid valve including a diaphragm 5 having an outer peripheral portion fixed between bodies 8 and 9 and a movable portion 1 supported by the diaphragm 5 and arranged opposite to the fixed core 10, the fixed core 10 is made of a magnetic material base 6. And a shaft 7 made of a magnetic material, and the shaft 7 made of the magnetic material is further provided with an electromagnetic steel sheet 1 having a rectangular cross section and having insulating films on both surfaces.
8 are laminated to form a rod shape.

[0009] In a second aspect of the present invention, the shaft 7 of the magnetic material is provided.
Is an electromagnetic steel sheet 18 having a rectangular cross section having insulating films on both sides.
2. The electromagnetic valve according to claim 1, wherein said electromagnetic valve is formed by alternately laminating magnetic steel plates 19 having a triangular or trapezoidal cross section in the circumferential direction.

[0010]

According to the solenoid valve of the present invention, the fixed core 10 has a combined structure of a magnetic material base 6 and a magnetic material shaft.
The magnetic material shaft 7 is formed in a rod shape by laminating an electromagnetic steel sheet 18 having a rectangular cross section having an insulating film on both sides with an adhesive to form a rod-like shape, thereby reducing overcurrent, increasing and decreasing the magnetic flux. Responsiveness can be significantly improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing one embodiment of a solenoid valve according to the present invention. FIG. 2 is a sectional view taken along line AA of FIG. FIG.
1 is an enlarged vertical sectional side view of a fixed core of an electromagnetic valve according to the present invention.
FIG. 4 is a sectional view taken along line BB of FIG. The solenoid valve according to the present invention includes a magnetic plate 23 at the upper part, and an electric coil 12 wound around an outer peripheral part of a non-magnetic bobbin 11 having a fixed core 10 at the center. A non-magnetic body 8 formed secondarily so as to cover the surface, a flow path 13 at the center, a valve seat 16 at the lower end, and ports 14 and 15 communicating with the flow path 13 are provided. And a non-magnetic body 9. Both of the bodies 8, 9
As shown in the figure, the magnetic material is integrated by caulking the upper end of the coil cover 17 made of a magnetic material.

The fixed core 10 is constituted by a combination of a magnetic material base 6 and a magnetic material shaft 7. The magnetic material shaft 7 is formed by a rectangular electromagnetic steel sheet 18 having insulating films on both surfaces and a cross section. Are alternately laminated in the circumferential direction with triangular or trapezoidal electromagnetic steel sheets 19 to form a rod shape. In addition,
The shaft 7 of the magnetic material thus obtained does not require drilling of the recess 20. The seal portion 21 provided on the outer edge of the diaphragm 5 is sandwiched by the lower end of the body 9 and the upper end of the bobbin 11, and the center is formed by the flange of the first member 2 and the third member. 4
The outer peripheral portion of the cylinder of the first member 2 and the inner peripheral portion of the cylinder of the third member 4 are joined by press-fitting or the like. It is formed on the upper surface of the flange portion of the member 2. Therefore, body 9
The valve seat 16 is sealed by the second member 3 of the movable portion 1 so that the flow path 13 and the port 15 are shut off.

In the recess 20 above the fixed core 10,
A compression coil spring 22 for constantly pushing up the movable portion 1 is arranged. When the electric coil 12 is de-energized by the compression coil spring 22, the movable portion 1 abuts on the valve seat 16 to keep the flow path 13 closed. It is supposed to.

When the electric coil is energized, a magnetic circuit is constituted by the electric coil 12, the fixed core 10, the coil cover 17, the plate 23, and the cylindrical third member 4.

[0015]

Next, the operation of this embodiment will be described with reference to FIG. In FIG. 2, when the electric coil 12 is not energized,
The movable portion 1 is pushed upward by the reaction force of the compression coil spring 22 to abut on the valve seat 16 to maintain a state in which the flow path 13 is closed. Next, when the electric coil 12 is energized, a magnetic circuit is formed by the fixed core 10, the coil cover 17, the plate 23, and the third cylindrical member 4, and the magnetic circuit is formed between the third cylindrical member 4 and the fixed core 10. When a suction force due to the magnetic flux is generated and the suction force is larger than the reaction force of the compression coil spring, the third cylindrical member 4 is fixed to the fixed core 10.
The movable portion 1 is separated from the valve seat 16 to open the valve.

At this time, the fixed core 10 is fixed to the magnetic base 6.
And a shaft of a magnetic material. Further, the shaft 7 of the magnetic material is made up of an electromagnetic steel sheet 18 having a rectangular cross section and an electromagnetic steel sheet 1 having a triangular or trapezoidal cross section.
And 9 are alternately laminated in the circumferential direction to form a rod,
When the magnetic flux at the start of energization of the electric coil increases or the magnetic flux at the time of energization cutoff decreases, the eddy current generated inside the cylindrical shaft portion of the fixed core 10 due to electromagnetic induction decreases, and The movable part 1 is the valve seat 1
The movable part 1 separates from the fixed core 10 from the response time until the valve is opened apart from 6 and the power supply to the electric coil is cut off,
The response time until the valve is closed after contacting the valve seat 16 can be shortened.

[0017]

Embodiment 2 FIG. 5 shows another embodiment of a fixed core 10 comprising a magnetic material base 6 and a magnetic material shaft 9, and is a view corresponding to a cross section taken along line BB of FIG. . In the shaft 7 shown in FIG. 5, since the electromagnetic steel plates 9 of a plurality of sizes are stacked in parallel, the stacking can be easily performed. In addition,
In forming the concave portion above the fixed core 10, it is preferable to perform a drilling process after lamination.

[0018]

[Experimental Examples] The present inventor conducted a comparison test between the conventional product and the product of the present invention with respect to the response when the power was turned on and the response when the power was cut off. The condition is that the thickness t of the electromagnetic steel sheet is 0.35 m.
m, and the outer diameter of the shaft portion was 7 mm. In addition, the product 1 of the present invention
Example 1 in which electromagnetic steel sheets are radially stacked is shown, and product 2 of the present invention is shown in Example 2 in which electromagnetic steel sheets are stacked in parallel. FIGS. 6A and 6B are comparison graphs of the responsiveness, wherein FIG. 6A shows the responsiveness when energized, and FIG. 6B shows the responsiveness when interrupted. As is clear from this graph, the responsiveness of the product of the present invention is remarkably improved in any state as compared with the conventional product.

[0019]

As described above, according to the present invention, the fixed core 10 has a combined structure of the base 23 of the magnetic material and the shaft of the magnetic material, and the shaft 7 of the magnetic material has a cross section having an insulating film on both surfaces. Since the rectangular electromagnetic steel sheets 18 are laminated to form a rod, the eddy current is reduced, and the response time from the start of energization to the electric coil to the opening of the valve, and the response from the energization cutoff to the closing of the valve. This is an extremely useful invention that can shorten the time, facilitates high-precision control and control during transition, and contributes to reduction of harmful exhaust gas from vehicles and improvement of fuel efficiency.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a solenoid valve according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged longitudinal sectional side view of a fixed core of the solenoid valve according to the present invention.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view of a shaft showing another embodiment of the fixed core 10;

FIG. 6 is a comparative graph of responsiveness.

FIG. 7 is a vertical side view of a conventional solenoid valve.

[Brief description of reference numerals]

DESCRIPTION OF SYMBOLS 1 Movable part 2 1st member
3 2nd member 4 3rd member 5 Diaphragm
6 Base 7 Axis 8 Body
9 Body 10 Fixed core 11 Bobbin
12 Electric coil 13 Flow path 14 port
15 Port 16 Valve seat 17 Coil cover 18
Magnetic steel plate with rectangular cross section 19 Magnetic steel plate with trapezoidal shape 20 Recess
DESCRIPTION OF SYMBOLS 21 Seal part 22 Compression coil spring 23 Plate

Claims (2)

[Claims] 1. A non-magnetic body 8,9, a fixed core 10 fixed to the body 8, an electric coil 12 for supplying a magnetic flux to the fixed core 10, and an outer peripheral portion between the bodies 8,9. In a solenoid valve comprising a fixed diaphragm 5 and a movable portion 1 supported by the diaphragm 5 and opposed to the fixed core 10, a combination of the fixed core 10 with a magnetic material base 6 and a magnetic material shaft 7 And the shaft 7 of the magnetic material is
An electromagnetic valve, wherein electromagnetic steel sheets 18 each having a rectangular cross section having an insulating film on both sides are laminated and formed in a rod shape. 2. The magnetic material shaft 7 is formed into a rod shape by alternately laminating in a circumferential direction electromagnetic steel plates 18 having a rectangular cross section having insulating films on both surfaces and magnetic steel plates 19 having a triangular or trapezoidal cross section. The solenoid valve according to claim 1, wherein: