JP2515967Y2 - Pilot operated solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a pilot-type solenoid valve used in water-utilizing devices such as hot water heaters and water heaters.

(Prior Art) Generally, a pilot-type solenoid valve has an advantage that a solenoid coil can be made smaller than a direct-acting solenoid valve, and has conventionally been used for water-utilizing equipment.

Conventionally, when a pilot-type solenoid valve is used in the water supply path of a water-using device, an orifice is provided in the water passage upstream of the pilot-type solenoid valve to limit the flow rate in order to stabilize its operation. It is also known that the valve is provided in the valve body of the pilot type solenoid valve.

(Problems to be solved by the invention) However, in the case where an orifice is provided in the inflow passage in the valve body, the water flow through the orifice is concentrated and hits one point of the main valve when the water pressure is high. There was a problem that the valve tilted and the water stop became poor.

That is, as shown in FIG. 3, a valve body 1 having an inflow passage 2, an outflow passage 3, and a main valve seat 4, a main valve 7 including a diaphragm 5 and a contact plate 6, and a pilot valve at the center of the main valve 7. A pilot valve 9 that comes into contact with and separates from the seat 8, an electromagnetic device 10 that operates the pilot valve 9, and a small hole 12 that is provided in the main valve 7 and that connects the inflow passage 2 and the valve chamber 11 behind the main valve 7 to each other. In the pilot type solenoid valve equipped with, when the orifice 13 is provided in the inflow passage 2, the water flow is high in the orifice 13 of the main valve 7 when the water pressure is high.
When the power supply to the electromagnetic device 10 is stopped when the water is stopped, the main valve 7 remains pressed and is pressed against the main valve seat 4, and the small hole 12 of the main valve 7 comes into contact with the orifice 13. Although the inclination of the main valve 7 can be reduced by arranging them so as to face each other, they must be carefully assembled so that the positions of the small hole 12 and the orifice 13 do not shift, which is a disadvantage in manufacturing. It was

An object of the present invention is to solve the above-mentioned conventional problems and to provide a pilot-type solenoid valve that does not fall into a water-stopping defect in the case of high water pressure and is excellent in assemblability.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a pilot solenoid valve of the present invention comprises an outer cylinder part, an inner cylinder that is raised inside the outer cylinder part with a coupling part between them and has an open tip. Part, an inflow side water chamber formed between the outer cylinder part, the coupling part and the inner cylinder part, an inflow passage formed on the opposite side of the inflow side water chamber with respect to the coupling part, including a part of the coupling part, A valve body that has an outflow passage communicating with the inside of the cylinder and a main valve seat formed at the tip of the inner cylinder, a main valve that contacts and separates from the main valve seat, and a pilot valve seat in the center of the main valve. A pilot valve that separates, an electromagnetic device that operates the pilot valve,
The main valve is provided with a small hole for communicating between the valve chamber formed on the opposite side of the main valve from the inlet water chamber and the inlet water chamber, and the inlet water chamber is provided at a part of the joint portion. And a plurality of orifices communicating with the inflow passage are arranged in parallel in the same flow direction as the flow direction of the inflow side water chamber.

(Operation) When the electromagnetic device is energized, the pilot valve is pulled up,
The pilot valve seat is opened and the water in the valve chamber behind the main valve flows into the outflow passage, reducing the pressure in the valve chamber. Therefore, the main valve is pushed up by the water pressure of the inflow side water chamber transmitted from the inflow passage through the plurality of orifices, the main valve seat is opened, and the inflow passage and the outflow passage are communicated.

The water supplied from the inflow passage is dispersed when it passes through multiple orifices and is not concentrated at one location on the main valve.Therefore, even if the small holes in the main valve are not aligned with the orifices, the main valve tilts. Therefore, when the power supply to the electromagnetic device is stopped, the pilot valve completely closes the pilot valve seat, the pressure in the valve chamber rises, and the main valve is reliably brought into close contact with the main valve seat.

(Embodiment) FIG. 1 shows an embodiment of the present invention, and the same reference numerals as those in the conventional example of FIG. 3 represent the same members. That is, reference numeral 1 denotes a valve body, which includes an outer tubular portion 1a, an inner tubular portion 1c that is raised inside the outer tubular portion 1a with a joining portion 1b between them, and has an open tip, an outer tubular portion 1a and a joining portion 1b.
1d of inflow side water chambers formed between the inner cylindrical portion 1c and the connecting portion 1b
Inflow passage 2 formed on the opposite side of the inflow side water chamber 1d, including a part of the above, an outflow passage 3 communicating with the inner side of the inner tubular portion 1c, and a main valve formed at the tip of the inner tubular portion. Having a seat 4. A main valve 7 is composed of a diaphragm 5 and a contact plate 6, and a pilot valve seat 8 is provided at the center. Reference numeral 9 is a pilot valve that comes into contact with and separates from the pilot valve seat 8, and forms a valve body at the tip of the plunger. Reference numeral 10 denotes an electromagnetic device that operates the pilot valve 9, and the end of the diaphragm 5 of the main valve 7 is fixed by screwing the electromagnetic device 10 to the valve body 1. Reference numeral 12 is a small hole that connects the valve chamber 11 behind the main valve 7 and the inflow side water chamber 1d, and 16 is a filter.

FIG. 2 is a plan view of the valve body 1 from which the electromagnetic device 10 and the main valve 7 are removed. A plurality of orifices 14 and 15 for communicating between the inflow side water chamber 1d and the inflow passage 2 are formed in a part of the ring-shaped coupling portion 1b, and the same flow direction as the flow direction of the inflow side water chamber 1d. Are installed side by side.

In the water-stopped state, the main valve 7 is passed through the small hole 12 of the main valve 7.
The valve chamber 11 behind the valve and the inflow passage 2 communicate with each other, the pressures of both are equal, and the main valve 7 closes the main valve seat 4.

When the electromagnetic device 10 is energized, the pilot valve 9 is pulled up, the pilot valve seat 8 is opened, the valve chamber 11 communicates with the outflow passage 3, the water in the valve chamber 11 flows out, and the pressure drops. Therefore, the main valve 7 is pushed up by the water pressure from the inflow passage 2, the main valve seat 4 is opened, and the water supplied from the inflow passage 2 is discharged from the outflow passage 3.
Leaked to

When the power supply to the electromagnetic device 10 is stopped, the pilot valve 9 closes the pilot valve seat 8, water flows into the valve chamber 11 through the small hole 12, the pressure in the valve chamber 11 rises, and the main valve 7 is pushed down. The main valve seat 4 is closed.

In the above operation process, since the water supplied from the inflow passage 2 passes through the plurality of orifices 14 and 15, the water flow hitting the main valve 7 is dispersed even in the case of high water pressure and is not concentrated in one place. Even if the position of 12 deviates from the position of the orifice 14 or 15, the main valve 7 does not tilt.

(Effects of the Invention) The pilot-operated solenoid valve of the present invention has the following excellent effects. In other words, even if the orifice is provided in the valve body and integrated, the main valve will not tilt when water pressure is high and will not fall into the fault of water stopping, and the reliability of water stopping of this type of pilot operated solenoid valve will be simple. Is improved. Further, it is not necessary to carefully match the position of the orifice with the position of the small hole of the main valve at the time of assembling, which improves the assemblability.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of a valve body of the same example, and FIG. 3 is a sectional view showing a conventional example. 1 ... Valve body 2 ... Inflow passage 3 ... Outflow passage 4 ... Main valve seat 7 ... Main valve 8 ... Pilot valve seat 9 ... Pilot valve 10 ... Electromagnetic device 11 ... Valve chamber 12 ... Small hole 14, 15 ... Orifice

Claims (1)

(57) [Scope of utility model registration request] 1. An outer cylinder part, an inner cylinder part that is raised inside the outer cylinder part with a coupling part between them, and has an open front end, and an inflow side formed between the outer cylinder part, the coupling part, and the inner cylinder part. A water chamber, an inflow passage formed on the opposite side of the inflow side water chamber with respect to the joint portion including a part of the joint portion, an outflow passage communicating with the inner side of the inner tubular portion, and a tip portion of the inner tubular portion A valve body having a main valve seat, a main valve that comes into contact with and separates from the main valve seat, a pilot valve that comes into contact with and separates from a pilot valve seat in the center of the main valve, an electromagnetic device that operates the pilot valve, and a main valve A small hole for communicating between the valve chamber and the inflow side water chamber formed on the opposite side of the inflow side water chamber with respect to the main valve is provided, and a part of the joint portion is provided between the inflow side water chamber and the inflow path. A pilot type solenoid valve in which a plurality of orifices communicating with each other are arranged side by side in the same flow direction as the flow direction of the inflow side water chamber.