JPH11280934A - solenoid valve - Google Patents

Abstract

(57) [Summary] [Objective] To reduce the manufacturing cost of the solenoid valve and increase the suction force of the movable core. [Constitution] A bobbin 1 is formed of a synthetic resin material. A partition wall 1E is formed inside the cylindrical portion 1A of the bobbin 1, and separates an upper opening 1F opening toward the upper end 1B and a lower opening 1G opening toward the lower end 1C. A groove 1J is formed in the inner peripheral wall 1H of the lower opening 1G, a fixed core 5 is fixedly arranged in the upper opening 1F, and the movable core 4 which has been pugged up by a spring 6 moves in the lower opening 1G. Arranged freely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve body which is formed in a valve body by a valve portion which moves a movable core to a fixed core side by a magnetic force generated by energizing a coil and moves integrally with the movable core. And a solenoid valve for opening and closing a valve seat hole.

[0002]

2. Description of the Related Art A conventional solenoid valve will be described with reference to FIG. Reference numeral 10 denotes a cylindrical portion 10A extending vertically and a cylindrical portion 1
And a pair of flanges 10B and 10C extending outward from the upper and lower ends of the cylindrical portion 10A, respectively. An opening 10D penetrates the inside of the cylindrical portion 10A from the upper end to the lower end. Is established. Reference numeral 11 denotes a packless pipe, which is inserted and arranged in the opening 10D of the bobbin 10. The upper end of the packless pipe 11 has the opening 10D.
, And the lower end protrudes further below the flange 10C. A coil 11 is wound around the outer periphery of the cylindrical portion 10A of the bobbin 10, and the packless pipe 1
1 above the opening 10D including the upper part of the fixed core 12
Are fixedly arranged, and the fixed core 12 is a bobbin 1
0. By being fixed to the bottom portion 13A of the housing 13 having a bottomed cylindrical shape, the housing 13 is fixedly disposed in the opening 10D. 14 is a lower end 12A of the fixed core 12
The movable core 14 is urged by a spring 15 so as to be separated from the lower end 12A of the fixed core 12. Reference numeral 16 denotes a valve portion disposed at the lower end of the movable core 14, and a valve seat hole 17 formed in the valve body 17.
Is opened and closed by the valve section 16.

[0003]

According to such a conventional solenoid valve, the packless pipe 11 is disposed in the opening 10D of the bobbin 10. The use of the packless pipe 11 causes the following problems. First, the cross-sectional shape of the packless pipe 11 is circular, and the movable core 14 movably disposed in the packless pipe 11 also has a circular shape. According to the above configuration,
A closed space S is formed between the lower end 12A of the fixed core 12 and the upper end 14A of the movable core 14 opposed thereto, and the movable core S is formed so that the space S does not become a compression chamber. It is necessary that a groove 14B for upward improvement be formed on the outer periphery of 14. Further, an O-ring 15 for sealing needs to be arranged between the fixed core 12 and the packless pipe 11. According to the above, the packless pipe 11 and
It is necessary to prepare the O-ring 15 and the movable core 1
Since it is necessary to form the groove 14B in the hole 4 and the assembling work thereof is required, a reduction in manufacturing cost cannot be achieved. Second, it is not possible to expect an increase in the suction force on the movable core 14. This is attributable to the fact that the packless pipe 11 exists between the cylindrical portion 10A of the bobbin 10 and the movable core 14, and the diameter of the movable core 14 becomes smaller corresponding to the thickness of the packless pipe 11. .

[0004] The present invention has been made in view of the above-mentioned problems, and it is a first object of the present invention to reduce the manufacturing cost and to provide an electromagnetic valve capable of increasing the attractive force of the movable core 14.
The purpose of.

[0005]

In order to achieve the above object, a solenoid valve according to the present invention comprises: a bobbin having a coil wound therearound; and a fixed core fixedly disposed at an inner upper end of the bobbin. ,
A solenoid that includes a movable core inside the bobbin and movably disposed facing the fixed core, and a valve portion that opens and closes a valve seat hole formed in a valve body disposed at a lower end of the movable core. In the valve, a bobbin formed of a synthetic resin material has a tubular portion extending vertically, a pair of flanges extending outward from the tubular portion, and an inner portion of the tubular portion facing the upper end. A partition wall that divides into an upper opening that opens at the lower end and a lower opening that opens toward the lower end, and a groove from the vicinity of the partition wall to the lower end is formed in the inner peripheral wall of the lower opening. A coil is wound around the outer periphery of the tubular portion between the flanges, the fixed core is fixedly arranged in the upper opening, and the movable core backed up by a spring is moved in the lower opening. It is characterized by being freely arranged.

[0006]

The upper opening in which the fixed core is disposed is cut off from the lower opening by the partition wall, so that the O-ring disposed on the outer periphery of the fixed core becomes unnecessary, and a groove is formed in the inner peripheral wall of the lower opening. Therefore, it is not necessary to form a groove in the movable core, and a reduction in manufacturing cost can be achieved. Further, since the need for the packless pipe is eliminated, the diameter of the movable core can be increased accordingly, and the suction force of the movable core can be increased.

[0007]

FIG. 1 shows an embodiment of a solenoid valve according to the present invention.
This will be described below. Note that the same reference numerals are used for the same structural parts as those in FIG. Reference numeral 1 denotes a bobbin formed of a synthetic resin material, and is composed of the following. The bobbin 1 has a cylindrical portion 1A in the up-down direction, and an opening 1D penetrates the cylindrical portion 1A from the upper end 1B to the lower end 1C. 1E is a partition formed in the opening 1D, and the opening is divided into an upper opening 1F and a lower opening 1G by the partition 1E. The upper opening 1F is open at the upper end 1B of the cylindrical portion 1A, and the lower opening 1G is at the cylindrical portion 1A.
Open at the lower end 1C of A.

[0008] Then, on the inner peripheral wall 1H of the lower opening 1G,
A groove 1J is formed from the vicinity of the partition wall 1E toward the lower end 1C. This groove 1J is well shown in FIG. 2, and in this example, four grooves 1J were formed.

A pair of flanges 1K and 1L are formed on the outer periphery of the bobbin 1 toward the outside.

Further, an annular O-ring groove 1N is formed in the outer peripheral portion near the lower end 1C of the cylindrical portion 1A.

The upper opening 1F, the partition wall 1
E, the cylindrical portion 1A having the lower opening 1G and the pair of flanges 1K and 1L are integrally formed by injection molding a synthetic resin material.

Here, the coil 11 is wound around the outer periphery of the cylindrical portion 1A between the flange portions 1K and 1L of the bobbin 1, and the O-ring 2 is disposed in the O-ring groove 1N. The tubular portion 1A near the lower end 1C of the bobbin 1 is inserted and arranged in the valve main body 17, and at this time, the O-ring 2 is contracted and arranged in the guide hole 17A of the valve main body 17 with elastic force. .

On the other hand, the flange 1L of the bobbin 1 is disposed on the upper end 17B of the valve body 17 via the magnetic pole disk 3, and at this time, the movable plunger 4 is placed in the lower opening 1G of the bobbin 1. It is arranged movably. A fixed core 5 is fixedly arranged in the upper opening 1A of the bobbin 1. For example, the upper end of the fixed core 5 is caulked to the bottom 1B of the housing 13. Reference numeral 6 denotes a spring located in the lower opening 1G and contracted between the partition wall 1E and the upper end of the movable core 4.

According to the solenoid valve of the present invention having the above configuration, when the coil 11 is energized, a magnetic circuit is formed by the fixed core 5, the movable core 4, the magnetic pole disk 3, and the housing 13, and the movable core 4 The spring force of the spring 6 overcomes the spring force, and the spring moves toward the partition wall 1E side (the fixed core 5 side), whereby the valve portion 16 opens the valve seat hole 17.

Here, according to the solenoid valve of the present invention, the movable core 4 is movably supported by the lower opening 1G directly without using a packless pipe. According to the above, the diameter of the movable core 4 can be increased to a large diameter corresponding to the thickness of the packless pipe, whereby the magnetic path area can be increased and the attraction force of the movable core 4 can be increased. It is a thing. On the other hand, the inner peripheral wall 1 of the lower opening 1G
According to the integral formation of the groove 1J in the H, the partition wall 1
E and a space S formed between the upper end 4A of the movable core 4
All pressure changes due to changes in internal volume are processed by the groove 1J, and there is no need to provide a special relief path such as a groove in the movable core 4.

Since the upper opening 1F is separated from the lower opening 1G by the partition wall 1E, there is no need to arrange any sealing member on the outer periphery of the fixed core 5.

Further, according to the fact that the upper opening 1F and the lower opening 1G are separated by the partition 1E, this partition 1
E plays a role of a magnet killer, and can set the spring force of the spring 6 weakly, which is preferable in reducing the size of the coil 11.

[0018]

As described above, according to the solenoid valve of the present invention, the bobbin formed of the synthetic resin material has a cylindrical portion extending vertically and a pair of tubular members extending outward from the cylindrical portion. A flange portion, a partition wall dividing the inside of the cylindrical portion into an upper opening opening toward the upper end and a lower opening opening toward the lower end, and an inner peripheral wall of the lower opening A groove is formed from the vicinity of the partition wall to the lower end, a coil is wound around the outer periphery of the cylindrical portion between the flanges, and a fixed core is fixedly arranged in the upper opening. Since the movable core backed up by a spring is movably arranged in the lower opening, the O-rings arranged around the outer periphery of the packless pipe and the fixed core can be eliminated, and the assembling work is not required. Cost reduction can be achieved. In addition, since the groove is formed integrally with the inner peripheral wall of the lower opening of the bobbin, the manufacturing cost of the movable core can be reduced, which is effective. Further, since the packless pipe is eliminated, the suction force of the movable core can be increased, and the opening and closing characteristics of the valve can be more reliably performed. Further, the partition wall serves as a magnet killer, thereby achieving the miniaturization of the coil.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a solenoid valve of the present invention.

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

FIG. 3 is a longitudinal sectional view of a conventional solenoid valve.

[Explanation of symbols]

 Reference Signs List 1 bobbin 1A cylindrical portion 1B upper end 1C lower end 1E partition wall 1F upper opening 1G lower opening 1H inner peripheral wall 1K, 1L flange 4 movable core

Claims (1)

[Claims] A bobbin having a coil wound therearound;
A fixed core fixed to the upper end inside the bobbin, a movable core inside the bobbin and movably arranged facing the fixed core, and a valve body arranged at the lower end of the movable core are formed. And a valve portion that opens and closes a valve seat hole, the bobbin 1 formed of a synthetic resin material has a cylindrical portion 1A extending in the vertical direction, and an outer side from the cylindrical portion 1A. A partition wall 1E that divides a pair of extending flanges 1K and 1L, an inner opening of the cylindrical portion 1A into an upper opening 1F opening toward the upper end 1B, and a lower opening 1G opening toward the lower end 1C. And an inner peripheral wall 1 of the lower opening 1G.
H has a groove 1J extending from the vicinity of the partition wall 1E to the lower end 1C.
And a cylindrical portion 1 between the flange portion 1K and the flange portion 1L.
A coil 11 is wound around the outer periphery of A, the fixed core 5 is fixedly arranged in the upper opening 1F, and the movable core 4 backed up by a spring 6 is movably arranged in the lower opening 1H. Characteristic solenoid valve.