JP3099207B2 - solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latch type solenoid valve.

[0002]

2. Description of the Related Art As shown in FIGS. 3 and 4, a conventional latch-type solenoid valve has a yoke 31 in which an iron core 34 is fixed to a yoke 31 and a coil 35 wound around a coil frame 36 is sandwiched therebetween. 32 and the yoke 31. The yoke 33 is also fixed to the yoke 31. The yoke 33 includes a valve seat 37.
Has been fixed. The armature 38 is a coil frame 36
It is located in the center hole of the
A magnet 39 magnetized on the north and south poles, for example, is fixed to the upper and lower sides of the mature member 38, and the valve body 4 made of a soft material is fixed.
0 is adhered.

In the conventional latch-type solenoid valve described above, in the state shown in FIG. 3, the magnet 39, the armature 38, the iron core 34,
The magnetic circuit of the yoke 31 and the yoke 32 is formed, and the armature 38 is attracted to the iron core 34. Therefore, the valve seat 37
And the valve body 40 is separated, and the fluid freely flows in the direction of the arrow in the valve seat 37.

Next, when the coil 35 is excited so as to be in the direction opposite to the direction of the arrow in FIG. 3, the armature 38 is pushed out, as shown in FIG.

Here, the magnet 39,
Since the magnetic circuits of the yoke 32, the yoke 31, the yoke 33, and the valve seat 37 are formed, the state of FIG. 4 continues. In the state shown in FIG. 7, the valve body 40 closes the valve seat 37 to stop the flow of the fluid because the magnet 39 tends to be attracted to the valve seat 37.

In the state shown in FIG. 4, when the armature 38 is excited in the direction of the arrow shown in FIG. 3, the armature 38 is attracted to the iron core 34 and the state shown in FIG. 6 is reached.

[0007]

The above-mentioned conventional solenoid valve uses expensive magnets in its parts, and has a disadvantage that the sealing between the valve body and the valve seat is not sufficient and leakage occurs. is there.

The present invention has been made in order to solve the above-mentioned drawbacks, and it is an object of the present invention to provide a solenoid valve which is relatively inexpensive and has good hermeticity.

[0009]

According to the solenoid valve of the present invention, an iron core is fixed to a yoke arranged near a coil, and an armature is provided which is turned in a direction in which a tip thereof contacts the iron core. The first spring that closes the valve by pressing the valve body by rotating the tip of the armature away from the iron core and the second spring that presses the valve body in the direction to open the valve. And at least one of a yoke, an iron core, and an armature is made of a material having a large residual magnetism.

In the electromagnet of the present invention, a coil made of a material having a large remanence is magnetized by energizing the coil in a pulsed manner, the tip of the armature is attracted to the iron core, and the valve is actuated by the force of the second spring. In addition, the magnetized parts are demagnetized by applying a pulse-shaped electric current in the direction opposite to the above-mentioned electric current, the armature is attracted by the magnetic force, and the armature tip is separated from the iron core by the force of the first spring. The valve is closed.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention. In this figure, 1 and 2 are respectively connected by screws or the like by casing. Reference numeral 5 denotes a yoke fixed to the casing 2 by screws 6, to which an iron core 7 is attached. Around the iron core 7, a coil 8 wound around a coil frame 9 is arranged. An armature 10 is inserted into the cut of the yoke 5 and is urged by a first spring 11 in a direction away from the iron core 7. Reference numeral 12 denotes a valve body fixed to the valve body shaft 13, which is slidably held with respect to the casing 2. The valve shaft 13 is
Is pressed downward in the drawing by the spring 15 of
The valve element 12 is moved away from the valve seat 17 as shown in the figure. Reference numeral 16 denotes an inlet formed in the casing 2, and reference numeral 18 denotes an air hole.

Since the first spring 11 is stronger than the second spring 15, the armature 10 is separated from the iron core as shown in FIG. The valve body shaft is pushed against the valve body shaft to bring the valve body 12 into close contact with the valve seat 17. That is, the valve closes. The yoke 5, the iron core 7, and the armature 10 are generally made of a ferromagnetic material such as mild steel or soft iron.
In this embodiment, it is made of a material having a large residual magnetism such as high carbon steel. The operation of the solenoid valve of the first embodiment having the above configuration will be described.

First, when no current is flowing through the coil 20, the valve is closed as described above. Here coil 2
When a pulse-like current is applied to 0, the armature 10 is attracted to the iron core 7 as shown in FIG. 1, and the valve body shaft 13 is pushed by the second spring 15 so that the valve body 12 opens the valve seat 17. Fluid flows. Even if power supply is stopped in this state, iron core 7
Since one or more of the arm 5 and the armature 10 are formed of a material having a large residual magnetism such as a high carbon steel as described above, the magnetism remains. The magnitude of the residual magnetism is determined so as to be stably attracted against the force of the spring 11.

Subsequently, in the state shown in FIG. 1, when a pulse-like current is applied so as to be excited in a direction opposite to the above-mentioned excitation, the residual magnetism is determined, and the force for attracting the armature is thereby obtained. , And the armature is returned to the state shown in FIG. 2 by the force of the first spring 11. As a result, the valve body shaft 13 is pushed up against the force of the spring 15, and the valve body 12 comes into close contact with the valve seat 17,
Thus, the valve closes and fluid flow from the inlet 16 is stopped. In addition, in the state of FIG. 1, the energization at the time of demagnetizing the residual magnetism may be the electric power necessary for eliminating the residual magnetism.
A power that is a fraction of the energization at the time of adsorption is sufficient.

[0016]

The solenoid valve of the present invention is a valve which does not use a relatively expensive magnet, has a simple structure, and has good adhesion between a valve seat and a valve body.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a valve according to a first embodiment of the present invention is opened.

FIG. 2 is a sectional view of the first embodiment with the valve closed;

FIG. 3 is a cross-sectional view showing an open state of a conventional solenoid valve.

FIG. 4 is a sectional view showing a closed state of the conventional solenoid valve.

[Explanation of symbols]

 Reference Signs List 5 yoke 7 iron core 8 coil 10 armature 11 first spring 12 valve body 15 second spring

Claims (1)

(57) [Claims] 1. A coil, a yoke arranged in the vicinity of the coil, an iron core fixed to the yoke, an armature whose tip is rotatable in a direction contacting with and away from the iron core, and a turn of the armature. A valve body that moves by movement and thereby opens and closes a valve seat, a first spring that rotates the armature in a direction away from the iron core, and a second spring that presses the valve body,
At least one of the yoke, the iron core, and the armature is made of a material having a large residual magnetism when a magnetic force is applied, and the coil is energized in a pulsed manner to increase the residual magnetism. By the magnetic action of a part, the tip of the armature is attracted to the iron core to open the valve and the coil is energized in a pulsed manner to eliminate the residual magnetism, thereby releasing the magnetic attraction to release the force of the second spring. The solenoid valve moves the armature in a direction in which the tip of the armature moves away from the iron core to close the valve.