JP2002276840A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem in a dispersion of a part dimension where a slight gap is generated between a field core and a yoke and a magnetic efficiency is sometimes reduced, it is required that much power is fed in order to certainly operate a valve and a power consumption is increased. SOLUTION: A solenoid valve is constituted by a bobbin 1 made of resin and provided with a solenoid coil; a plunger 3 having a valve body at one end; a spring 5 for forcing the valve body 4 mounted to the plunger to a valve seat 10 at the time of non-energization; a field core 6 formed so as to project as compared with an end surface of the bobbin; a seal member 7 for preventing a leakage of a fluid to the outside which are inserted into an inner cylinder of the bobbin; and an approximately reverse C-like yoke 8 for clamping these members. A projection 9 integrally formed with the bobbin and having an elasticity is provided on a contact surface of the bobbin with the yoke and the yoke and the field core are certainly contacted with each other by the elasticity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for controlling a fluid, and more particularly to a structure of a solenoid valve which has good assemblability and is suitable for improving performance.

[0002]

2. Description of the Related Art The following is a detailed description of what has heretofore been found in JP-A-11-248022. In this example,
A bobbin in which a two-port valve body having a valve seat is formed of a resin material, a plunger having a valve body at one end, a pole core having a spring and a seal member attached thereto is inserted into an inner cylinder, and a magnet wire is wound around an outer peripheral portion. Is mounted, and these members are sandwiched by a substantially U-shaped yoke.

[0003]

However, in the conventional configuration, a slight gap may be generated between the pole core and the yoke depending on the variation in the dimensions of the components, and the magnetic efficiency may be reduced. It is necessary to supply a large amount of power, and there is a problem that power consumption increases. In addition, there is a problem that if no gap is formed, it becomes difficult to insert the yoke, which makes assembly difficult.
In addition, when the yoke having a substantially U-shape is used in which internal pressure is applied, it is necessary to increase the thickness of the yoke in order to secure the strength, and there is a problem that the material cost and the processing cost increase.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a solenoid valve which is easy to assemble, inexpensive, and can reduce power consumption.

[0005]

In order to achieve the above object, the present invention provides a resin bobbin provided with an electromagnetic coil, a plunger having a valve at one end inside an inner cylinder of the bobbin,
A spring for urging the valve body attached to the plunger to the valve seat at the time of non-energization, a pole core formed so as to protrude from the bobbin end face, and a seal member for preventing leakage of fluid to the outside are inserted. The yoke and the pole core are constituted by a substantially U-shaped yoke that sandwiches the member, and a convex portion having elasticity formed integrally with the bobbin is provided on a contact surface of the bobbin with the yoke. It is characterized in that it is configured to contact.

Another embodiment is characterized in that an elastic member is mounted between a bobbin and a flange of a pole core or between a bobbin and a yoke, and the yoke and the pole core are securely contacted by this elasticity. It is.

Another embodiment is characterized in that an insertion groove for inserting one end of a yoke into a bobbin is provided to prevent deformation of the yoke due to internal pressure.

[0008]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing one embodiment of the present invention. A plunger 3 having a valve body 4 mounted at one end inside an inner cylinder of a resin bobbin 1 having an electromagnetic coil 2 mounted thereon.
And a spring 5 for urging the valve body 4 against the valve seat 10 and a pole core 6 to which a seal member 7 is attached are inserted, and these members are clamped by a substantially U-shaped yoke 8. I have. When the power is not supplied, the valve body 4 is urged by the spring 5 via the plunger 3 and is seated on the valve seat 10.
Communication between 1a and 11b is interrupted. Electromagnetic coil 2
When the power is supplied to the plunger 3, the plunger 3 is attracted toward the pole core 6 by the magnetic force against the spring 5, the valve element 4 is separated from the valve seat 10, and the fluid flows through the flow paths 11 a and 11 b. When the energization is stopped, the magnetic force disappears and the plunger 3 is pushed down by the spring 5, so that the valve body 4 is seated on the valve seat 10 and the communication between the flow paths 11a and 11b is cut off.

If a non-magnetic spacer 16 is inserted between the plunger 3 and the pole core 6 as needed, the effect of the residual magnetism is eliminated and the interruption operation becomes smooth. When a rubber material or the like is used, the impact noise during operation is reduced.

In this embodiment, the lower end of the bobbin 1
And a projection 9 formed integrally with the yoke 8 is formed so that the dimension from the upper end surface of the pole core 6 to the projection 9 is larger than the inner dimension of the yoke 8. When the yoke 8 is inserted so as to compress these members, the elasticity of the projection 9 causes the yoke 8 to be pulled down, so that the pole core 6 and the yoke 8 can be reliably brought into contact.

FIG. 3 is a perspective view showing an example of the shape of the protrusion 9 provided on the lower end surface of the bobbin 1. The shape of the convex portion 9 is not limited to the shape shown in FIG. 3. For example, any shape and number such as circular protrusions can be used as long as they have appropriate elasticity in consideration of contactability and assemblability. Is obtained.

FIG. 4 is a sectional view showing another embodiment of the present invention. In this embodiment, a plunger 3 having a valve body 4 mounted therein and a spring 5 are provided in an inner cylinder of a bobbin 1 having an electromagnetic coil 2 mounted therein.
The elastic member 12 is inserted between the stepped portion provided on the bobbin 1 and the flange of the pole core 6.
Of the bobbin 1 is larger than the inside size of the yoke 8. When the yoke 8 is inserted so as to compress these members, the elasticity of the elastic member 12 pushes the pole core 6 upward,
It is configured to reliably contact the yoke 8.

The elastic member 12 is made of, for example, a material such as resin, rubber, and metal, and has appropriate elasticity suitable for contactability and assemblability by adjusting hardness and shape.

FIG. 5 is a sectional view showing another embodiment of the present invention. In this embodiment, a plunger 3 having a valve body 4 mounted therein and a spring 5 are provided in an inner cylinder of a bobbin 1 having an electromagnetic coil 2 mounted therein.
And a pole core 6 formed so as to protrude from the upper surface of the bobbin 1, and an elastic member 12 is provided between the lower surface of the bobbin 1 and the yoke 8. The dimension from the top end face of the pole core 6 to the lower end face of the elastic member 12 is configured to be larger than the inside dimension of the yoke 8. When the yoke 8 is inserted so as to compress these members, the elastic member 1
The yoke 8 is pulled downward due to the elasticity of the yoke 2 so that the top end surface of the pole core 6 and the yoke 8 are securely contacted.

The elastic member 12 is made of, for example, a material such as resin, rubber, and metal, and has appropriate elasticity suitable for contactability and assemblability by adjusting hardness and shape.

When the elastic member 12 is formed of a magnetic material, improvement in magnetic efficiency can be expected.

FIG. 6 is a perspective view showing another embodiment of the present invention. In the present embodiment, an insertion groove 13 into which one end of a substantially U-shaped yoke 8 can be inserted is provided in the upper part of the bobbin 1, and a plunger 3, in which a valve body 4 is mounted, a spring 5, a pole core 6, An insertion port 14 for inserting a component such as the seal member 7 is provided.

In the case of the conventional example shown in FIG. 8, when pressure is applied to the inside of the solenoid valve, the pole core 6 is pushed upward by the pressure, the yoke 8 is deformed, and the gap between the plunger 3 and the pole core 6 is increased, so that the attractive force of the coil is increased. If the internal pressure is high, the yoke 8
However, it is necessary to increase the thickness of the sheet so as not to be deformed, or to reinforce the sheet by caulking or the like.

According to the present embodiment, since the yoke 8 is inserted into the groove 13 of the bobbin 1, the yoke 8 is not deformed even if a pressure is applied to the inside of the solenoid valve and the yoke is pushed by the pole core 6.
Therefore, since the thickness of the yoke 8 can be reduced, the material cost can be reduced, the workability can be improved, and the cost can be reduced. Although the insertion opening 14 is circular in the embodiment shown in FIG. 5, the insertion opening 14 is not limited to a circular shape, and may have any shape convenient for assembly.

FIG. 7 is a sectional view showing an embodiment in which the valve seat 10 and the inflow and outflow ports 11a and 11b are formed integrally with the bobbin 1. FIG. 7 shows a combination with the first embodiment, but a configuration according to another embodiment is also possible.

[0021]

According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect, since the yoke and the pole core can be securely contacted without increasing the number of parts, a decrease in magnetic efficiency due to poor contact can be prevented, and the reliability of operation can be improved and power consumption can be reduced. it can.

According to the second and third aspects, since the yoke and the pole core can be reliably brought into contact with each other with a simple configuration, a decrease in magnetic efficiency due to poor contact can be prevented, the operation reliability is improved, and power consumption is improved. Can be reduced.

According to the fourth aspect, since the magnetic efficiency is improved by using a magnetic material for the elastic member, the reliability of operation can be further improved and the power consumption can be reduced.

In the fifth and sixth aspects, the thickness of the yoke can be reduced without increasing the number of parts and without using any means such as caulking, so that costs such as material costs, processing costs, and assembly costs are reduced. Can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is an external view showing a first embodiment of the present invention.

FIG. 3 is a perspective view showing one embodiment of the shape of the convex portion according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

FIG. 5 is a sectional view showing a third embodiment of the present invention.

FIG. 6 is a perspective view showing a fourth embodiment of the present invention.

FIG. 7 is a sectional view showing a fifth embodiment of the present invention.

FIG. 8 is a sectional view showing the structure of a conventional solenoid valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Resin bobbin 2 ... Electromagnetic coil 3 ... Plunger 4 ... Valve 5 ... Spring 6 ... Pole core 7 ... Seal member 8 ... Yoke 9 ... Protrusion 10 ... Valve seat 11a, 11b ... Inflow / outflow path 12 ... Elastic member 13 … Insert groove 14… Insert 15… Terminal 16… Spacer 17… O ring

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobunaga Matsufuji 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka F-term (reference) 3T106 DA08 DA13 DA23 DB02 DB12 DB23 DB32 DC02 DD02 EE22 EE35 GA10 GA11 GB03 5E048 AA08 AB01 AD04 CB05

Claims (6)

[Claims] 1. A resin bobbin provided with an electromagnetic coil,
A plunger having a valve body mounted at one end in the inner cylinder of the bobbin, and a spring for biasing the valve body to the valve seat when not energized,
A pole core having a flange portion engageable with a resin bobbin and formed so as to protrude from the end surface of the bobbin, and a seal member for preventing leakage of fluid to the outside are inserted and sandwiched by a substantially U-shaped yoke. An electromagnetic valve characterized in that the resin bobbin has a projection integrally formed on a contact surface with a yoke. 2. A bobbin provided with an electromagnetic coil, a plunger having a valve inserted at one end inserted into an inner cylinder of the bobbin, a spring for urging the valve to a valve seat when power is not supplied,
A pole core having a flange portion and disposed so as to protrude from the bobbin end face, and a seal member for preventing leakage of fluid to the outside,
It has an elastic member between the bobbin and the flange of the pole core,
An electromagnetic valve characterized by being held by a substantially U-shaped yoke. 3. A bobbin provided with an electromagnetic coil, a plunger having a valve inserted at one end inserted into an inner cylinder of the bobbin, a spring for urging the valve against a valve seat when power is not supplied,
A pole core having a flange portion engageable with the bobbin and formed so as to protrude from the end surface of the bobbin, a seal member for preventing leakage of fluid to the outside, and an elastic member between the bobbin and the yoke. An electromagnetic valve characterized by being sandwiched by a substantially U-shaped yoke. 4. The solenoid valve according to claim 3, wherein the elastic member provided between the engagement portion at one end of the bobbin and the yoke is made of a magnetic material. 5. The solenoid valve according to claim 1, wherein an inlet, an outlet, and a valve seat are formed integrally with the bobbin. 6. An insertion groove in which the substantially U-shaped yoke can be inserted is provided on a side of the bobbin where the pole core is inserted, and an end surface of the insertion groove extends along an extension of the inner cylinder of the bobbin. The solenoid valve according to any one of claims 1 to 5, wherein a larger insertion hole is provided.