JPS6023580Y2 - Differential pressure operated 2-way solenoid valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a piston type differential pressure operated two-way solenoid valve.

Conventionally, in differential pressure operated two-way solenoid valves that open and close the main valve using the differential pressure between the primary fluid pressure and the secondary pressure acting on the piston, the piston and cylinder have been designed with machinability in mind. Although it is made of materials with good machinability, there is significant wear due to the sliding between the two, and when foreign matter in the fluid gets caught in the sliding surfaces of the two, a so-called "one galling" phenomenon occurs. This caused the solenoid valve to malfunction.

Moreover, using a material with high hardness to solve these problems has a problem in terms of workability.

In view of the current situation, the present invention is characterized in that by forming the cylinder by plastic processing of a metal plate, the sliding surface has wear resistance, and the solenoid valve can be manufactured lightweight and at low cost. It is.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In the illustrated two-way solenoid valve, the valve body 1 has a fluid population 2
and a fluid outlet 3, and a main valve 5 between them.
The main valve 5 has a piston-like shape and is slidably fitted into a cylinder 6 fixed on the valve body 1. ing.

The cylinder 6 is shaped by press working from a metal plate, and has upper and lower flanges 6a and 6b integrally connected to each other.
The lower flange portion 6b serves as a mounting surface for the valve body 1, and the upper flange portion 6a serves as a connection surface for the solenoid 7.

Further, the piston-shaped main valve 5 is similarly shaped by plastic working of a metal plate.

The main valve 5 fitted in the cylinder 6 has a pressure acting chamber 8 behind it, and the main valve 5 also has a small hole 9 for guiding the primary fluid pressure from the fluid valve 2 to the pressure acting chamber 8. Similarly, a gap 10 is formed between the sliding surfaces of the main valve 5 and the cylinder 6 to guide the primary side fluid pressure to the pressure action chamber 8, and the main valve 5 also allows the fluid in the pressure action chamber 8 to flow to the fluid outlet 3. A pilot hole 11 is provided to allow the water to flow out.

The solenoid 7 fixed on the flange 6a of the cylinder 6 has a movable core 15 that is attracted to the fixed core 14 against the elastic force of the spring 13 by energizing the coil 12. A seat portion 16 for opening and closing the pilot hole 10 is provided on the movable iron core 15.

In the two-way solenoid valve having the above configuration, when the coil 12 is not energized as shown in the drawing, the primary side fluid pressure in the fluid population 2 passes through the small hole 9 and gap 10 of the main valve 5 to the pressure action chamber 8. In this case, the pilot hole 11 is closed by the seat portion 16 of the movable core 15 which is pressed by the elastic force of the spring 13, so the pressure in the pressure action chamber 8 becomes equal to the primary side fluid pressure. Therefore, the main valve 5 is brought into pressure contact with the valve seat 4 due to the acting force on the main valve 5 based on the differential pressure between the primary and secondary fluid pressures and the elastic force of the spring 13, and the main valve opening is Closed.

When the coil 12 is energized in this state, the movable iron core 15 is attracted to the fixed iron core 14 and the pilot hole 11 is opened, so that the pressure action chamber 8 and the fluid outlet 3 are electrically connected, and the pressure inside the pressure action chamber 8 is Since the pressure drops to the side fluid pressure, the main valve 5 is lowered by the acting force based on the difference between the primary fluid pressure that acts on the portion of the main valve 5 on the outer peripheral side of the contact portion with respect to the valve seat 4 and the fluid pressure in the pressure action chamber 8. is pushed open, opening the main valve opening.

In this way, the piston-shaped main valve 5 slides up and down within the cylinder 6 each time the main valve opening is opened and closed.
The sliding part needs to be made of a wear-resistant material, but in the present invention, as the cylinder is formed by plastic processing of a metal plate, the sliding surface is formed by plastic processing. It has excellent wear resistance due to work hardening, and the cylinder has a high degree of work overall due to plastic working, so it has excellent tensile strength and can be manufactured using less material. ,
It can be manufactured significantly lighter and at a lower cost than when manufactured by casting or the like.

In addition, in the present invention, the cylinder is formed with upper and lower flanges integrally connected by pressing a metal plate, and the flanges are used for connection with the valve body and the solenoid. The part makes effective use of the flange that is inevitably formed by pressing a metal plate, and the flange formed by pressing a metal plate is significantly thicker than the cylindrical part. Using it as a flange for mounting to the front of the valve is extremely effective in maintaining mounting strength and sealing performance.Furthermore, if the cylinder is press-formed, it will prevent the main valve from sliding. Since the direction and the flow line of the material accompanying the press working of the cylinder match, the sliding movement between the main valve and the cylinder can be made even smoother.

[Brief explanation of drawings]

The drawing is a sectional view showing an embodiment of a two-way solenoid valve according to the present invention. 1... Valve body, 4... Valve seat, 5...
...Main valve, 6...Cylinder, 7...
Solenoid, 8... Pressure action chamber, 11...
...Pilot hole, 15...Movable iron core.

Claims (1)

[Scope of utility model registration request] A valve seat that cooperates with the main valve to form a main valve opening is provided between the fluid inlet and the fluid outlet of the valve body, and the main valve is formed into a piston shape, and the valve seat is provided in the cylinder on the valve body. The pressure chamber is slidably fitted to the main valve and is connected to the fluid inlet through the pressure chamber located behind the main valve.The pilot hole of the main valve, which is opened and closed by the movable core of the solenoid, connects the pressure chamber to the fluid outlet. In this solenoid valve, the above-mentioned cylinder connected to the valve body and separate from the above-mentioned cylinder is formed by press working a metal plate to integrally connect upper and lower flange parts.These flange parts serve as a connection surface for the solenoid and the above-mentioned valve. A differential pressure operated two-way solenoid valve characterized by a mounting surface to the main body that has an improved shape.