JP3144945B2 - 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 solenoid valve used for controlling a process fluid or the like.

[0002]

2. Description of the Related Art In various plants, solenoid valves are used to control process fluids and the like. This solenoid valve is generally configured as shown in FIG. Exhaust in the figure, the channel is provided a process fluid or the like flows into the body 11, and <br/> inlet port 11a and outlet port 11b the passage process fluid or the like is to and flows out flows into the flow path You
An exhaust port 11c and an inlet sheet surface 11d and an exhaust sheet surface 11e for opening and closing the flow path are formed.

[0003] A disk holder 13 for controlling exhaust is incorporated in the body 11 in a movable state. A disk is integrally mounted on the disk holder 13, and the lower surface thereof is pressed by a disk spring 16. I have.

A fixed iron core 17 is connected to the upper part of the body 11, and a coil 18 is installed on the outer surface thereof.
The core 12 is incorporated in a movable state, and the core 12 is provided with a core spring 15.

[0005] As described above, the disk 14 is a disk holder.
The disk holder 13 moves by the amount of deformation when the disk 14 is deformed over a long period of use, because it is integrated with the disk 13 and the disk 14 is made of a material such as rubber or resin due to the requirement of sealing. Finally, the disc holder leg 13a comes into contact with the tip of the core.

[0006]

As described above, in the conventional solenoid valve, the disk 14 is deformed due to long-term use, and the disk holder legs 13a come into contact with the tip of the core. The disk 14 is in an integrated state.

The problem in such a case will be described with reference to FIG. The figure shows the core 12, disc holder 13, disc 14, core spring 15 and disc spring 16
3 schematically shows the movable part of FIG.

FIG. 4A shows a state in which there is a gap (δ ₁ ) between the disk holder leg 13a and the tip of the core. When the power is turned off in this state, only the core spring force (Fc) acts on the core. , The core moves to the right side and impacts against the disk holder leg 13a.
The valve is switched normally by moving 14 to the right.

FIG. 4B shows a state in which the disk holder leg 13a and the tip of the core are in contact with each other. When the power is turned off in this state, the core spring force (Fc) acts on the core to the right, but to the left. Is caused by the force of the disk spring force (FD) and the fluid pressure on the exhaust seat surface 11e, and the driving force for valve switching is reduced. Therefore, when an uncertain leftward force such as a biting force due to disk deformation is applied, there is a problem that an operation delay of the solenoid valve occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an electromagnetic valve capable of always ensuring a gap between a tip of a disk holder leg and a core and performing quick and reliable switching.

[0011]

Means for Solving the Problems] solenoid valve according to claim 1, upper
With a cover housing and a bonnet at the bottom
And a fixed member provided in the cover housing.
A fixed iron core, a coil provided on the outer surface of the fixed iron core,
A core movably incorporated in the fixed core,
The spring provided in the core and the bonnet
A flow path through which the process fluid flows, and the flow path
Bonnet space provided in the center of the hood
And an inlet port, an outlet port, and an exhaust port formed in the flow path.
Air port, inlet seat surface and exhaust seat surface,
The core is movably incorporated in the space inside the
A disk holder that contacts the core when power is applied and controls exhaust
And a disk spring on the underside of this disk holder.
A disk provided through the disk to seal the exhaust sheet surface
And a leg of said disk holder.
Mechanically secures the gap (δ ₁ ) between the tip of the core and the tip of the core
However, even if the disk is deformed, the exhaust seat pressure is
A gap ([delta] ₂ ) between the disk and the disk holder is provided so that the disk can be maintained. The invention of claim 2
Is the gap between the tip of the leg of the disc holder and the tip of the core.
At the interval (δ ₁ ), the disk holder is provided with a stopper
It is characterized by securing. The invention according to claim 3 is characterized in that the data
Clearance between the tip of the disc holder leg and the tip of the core (δ ₁ )
The body is provided with a stopper to secure
You.

[0012]

The solenoid valve of the present invention constructed as described above has a gap (δ ₂ ) necessary for deformation of the disk between the disk holder and the disk, even if the solenoid valve is always used in the excited state, so that the The exhaust sheet surface is reliably sealed by the spring and the fluid pressure, and the amount of movement of the disk holder is limited by the stopper, so that the gap (δ ₁ ) between the disk holder leg and the core tip is always ensured.

In this state, when the solenoid valve is demagnetized and the valve is actuated, only the force of the core spring acts on the core, and the core is securely separated from the fixed core, and the disk holder is removed. By colliding with the leg, the disk holder and the disk are operated, and the switching of the solenoid valve can be reliably performed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a solenoid valve according to the present invention will be described with reference to FIG. In the drawing, reference numeral 1 denotes a body, an upper portion constitutes a cover housing, and a lower portion constitutes a bonnet, 2 denotes a core, 3 denotes a disk holder, 4 denotes a disk called a soft seat, 5 denotes a core spring, and 6 denotes a disk. A spring, 7 is a fixed iron core, and 8 is a coil.

That is, in FIG. 1, a flow path is provided in the body 1, and an inlet port 1a, an outlet port 1b, an exhaust port 1c, an inlet seat surface 1d, and an exhaust seat surface 1e are formed. A disk holder 3 for controlling exhaust is incorporated in the body 1 so as to be movable, and a stopper 3b is formed on the disk holder 3.
The disk 4 is movably fitted to the disk holder 3 and is pushed by the disk spring 6 toward the exhaust seat surface 1e.

A fixed iron core 7 is connected to the upper part of the body 1, and a coil 8 is installed on the outer surface of the fixed iron core 7. The core 2 is movably incorporated inside the core 1, and a core spring 5 is provided on the core 2. It is a structure that was given.

In the above-described solenoid valve according to this embodiment,
When the coil 8 is not energized, the core 2 is pushed down by the core spring 5, and the tip of the core 2 pushes down the disc holder leg 3a, so that the disc holder 3 and the disc 4 are also pushed down. In this way, the inlet seat surface 1d is sealed by the core 2, and the exhaust seat surface 1e is opened.

On the other hand, when the coil 8 is energized, the core 2 is attracted to the fixed iron core 7 and the inlet seat surface 1d is opened, and at the same time, the pressing force of the disk holder 3 is released. The disk 4 and the disk holder 3 move upward, and the disk 4 seals the exhaust sheet surface 1e. By switching the power supply of the coil 8 on and off in this manner, the flow path can be switched.

In this embodiment, since the stopper 3b is formed on the disk holder 3, a gap (δ ₁ ) is always secured between the disk holder leg 3a and the tip of the core 2 when the solenoid valve is energized. Since the disk 4 and the disk holder 3 are initially fitted with a gap (δ ₂ ), even if the disk 4 is deformed, the sheet surface pressure can be secured following the deformation.

Next, another embodiment of the present invention will be described with reference to FIG. This embodiment has the same configuration except that the method for restricting the movement of the disk holder 3 of the embodiment shown in FIG. 1 is changed as follows. Therefore, the same parts as those in FIG.

That is, in this embodiment, a gap (δ ₁ ) between the tip of the disk holder leg 3a and the tip of the core 2 can be secured by providing the body 1 with the stopper 1f.
Thus, in this embodiment, the movement of the disk holder 3 can be restricted. The operation of this embodiment is the same as that of the above-described embodiment.

[0022]

According to the present invention, a gap (δ ₁ ) is always secured between the disk holder leg and the tip of the core when the power is supplied, and the disk and the disk holder are fitted so that they can follow the deformation of the disk. This is a highly reliable solenoid valve that can reliably seal the exhaust sheet surface even when used for a long period of time and that can reliably perform a switching operation when power is turned off.

In particular, the solenoid valve used for the safety device in an emergency is always used in an energized state from the viewpoint of fail-safe, and it is necessary to turn off the power in an emergency to ensure the safety operation without delay. If an electromagnetic valve is used, switching can be performed without delay, which can greatly contribute to improvement in safety.

[Brief description of the drawings]

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

FIG. 2 is a schematic structural view showing another embodiment of the solenoid valve according to the present invention.

FIG. 3 is a schematic structural view of a conventional solenoid valve.

4A is a schematic diagram schematically showing a movable portion of the solenoid valve in FIG. 3, and FIG. 4B is a schematic diagram showing a state where the disk holder has moved in FIG.

[Explanation of symbols]

1 ... body, 1a ... inlet port, 1b ... outlet port, 1
c ... exhaust port, 1d ... inlet seat surface, 1e ... exhaust seat surface, 2 ... core, 3 ... disk holder, 3a ... disk holder leg, 3b ... stopper, 4 ... disk, 5 ... core spring, 6 ... disk spring, 7 ... fixed iron core,
8 ... Coil.

Continuation of the front page (56) References JP-A-4-83982 (JP, A) JP-A-63-125876 (JP, A) JP-A-3-189486 (JP, A) JP-A-3-117180 (JP, A) , U) Japanese Utility Model 4-113384 (JP, U) Japanese Utility Model 4-136382 (JP, U) Japanese Utility Model Utility Model 61-186872 (JP, U) Japanese Utility Model Utility Model 1-136776 (JP, U) 3-8846 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16K 31/06-31/11

Claims (3)

(57) [Claims] 1. A cover housing having an upper portion and a lower portion having a cover housing.
A body having a bonnet in the part, and the cover housing
And the outer surface of the fixed core
And a movable coil incorporated in the fixed core
Core and a spring provided in this core,
A flow path through which a process fluid flows in the bonnet;
A channel is provided at a central portion within the bonnet communicating with the bonnet.
A bonnet space, and an inlet port formed in the flow passage.
Port, outlet port, exhaust port, inlet seat surface and exhaust
Mounted movably in the seat surface and the space inside the hood
In rare cases, when the core is not energized, it contacts the core and controls exhaust.
Disc holder and the disc under the disc holder.
The exhaust seat surface provided through a screen spring
The electromagnetic valve includes a disc which Lumpur, leg tip and the core tip of clearances of the disc holder ([delta] ₁₎
And a gap (δ ₂ ) between the disk and the disk holder is provided so that the exhaust sheet surface pressure can be maintained even if the disk is deformed. . 2. The solenoid valve according to claim 1, wherein a gap (δ ₁ ) between the tip of the leg of the disc holder and the tip of the core is secured by providing a stopper on the disc holder. 3. The solenoid valve according to claim 1, wherein a gap (δ ₁ ) between the tip of the leg of the disk holder and the tip of the core is secured by providing a stopper on the body.