JP2000283322A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized solenoid valve of a simple structure which can manually discharge and stop water with small operation force, and prevent fail to stop water. SOLUTION: This solenoid valve has a valve seat 5 arranged between a primary side flow passage 3 and a secondary side flow passage 4 of a valve body 1, a diaphragm valve body 2 detachably seated at the valve seat 5, a pressure chamber 6 formed on a back side of the diaphragm valve body 2, a polot hole 7 formed on the diaphragm valve body 2, and a plunger 9 operated by current carrying to an electromagnetic coil 8. A manually operated button 15 is pushed into the side of the valve main body 1, and the plunger 9 is pushed up against a spring 11 by means a rod 17 inserted into the pilot hole 7. The pressure chamber 6 is communicated with a secondary side flow passage 4 through a pilot hole 7, for detaching the diaphragm valve body 2 from the valve seat 5 and thereby discharging water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic valve for opening and closing a flow path by a plunger operated by energizing an electromagnetic coil. It relates to a solenoid valve.

[0002]

2. Description of the Related Art Conventionally, as this type of solenoid valve, for example,
The configuration was as shown in FIG.

That is, a manual opening / closing screw a is screwed into a female screw 1a provided at a lower portion of the valve body 1 of the solenoid valve B, and is rotated forward in the direction of the diaphragm valve body 2 so that the primary side flow path 3 and the secondary side The primary flow path 3 and the secondary flow path 4 are communicated by separating the diaphragm valve element 2 blocking the flow path 4 from the valve seat 5 against the pressure difference between the primary side and the secondary side. And let it spout.

The manual opening / closing screw a is rotated back from the diaphragm valve body 2, and the diaphragm valve body 2 comes into contact with the valve seat 5 by the differential pressure between the primary side and the secondary side, and the primary side flow path 3 and the secondary side flow path are connected to each other. Water was stopped by shutting off the side flow path 4.

As another configuration, a configuration as shown in FIGS. 3 and 4 is known.

In this apparatus, bypass passages c and e for connecting the pressure chamber 6 and the secondary passage 4 are provided, and these bypass passages c and e are operated by manual operation buttons b and d as required. By opening and closing, the diaphragm valve body 2 is seated on and separated from the valve seat 5 by the differential pressure between the primary side and the pressure chamber 6.

[0007]

However, in the former configuration, it is necessary to push up the entire diaphragm valve body 2 having a large pressure receiving area against the pressure difference between the primary side and the secondary side to discharge water. When the water pressure on the primary side was high, it required a very large force to operate.

In addition, since the water discharge state is maintained until the manual opening / closing screw a is retracted, there is a problem in that the user forgets to stop the water after using the device and the water keeps flowing.

On the other hand, in the latter case, since the pressure receiving area is much smaller than that of the diaphragm valve body 2, the operating force may be small, and there is no danger of forgetting to stop water because the spring automatically returns. Bypass passages c and e to the next side
Need to be provided separately, there arises a problem that the solenoid valves B, C, and D are inevitably increased, and the structure is complicated and the manufacturing cost is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to perform manual water discharge / water stoppage with a small operation force, and to prevent forgetting to stop water, and An object of the present invention is to provide a small and simple electromagnetic valve.

[0011]

In order to achieve the above object, the present invention provides a valve seat provided between a primary side flow path and a secondary side flow path; A diaphragm valve body for preventing water from flowing out of the primary side flow path to the secondary side flow path by seating; a pressure chamber provided on the back side of the diaphragm valve body; and a pressure chamber provided on the diaphragm valve body. A pilot hole that communicates the pressure chamber with the secondary flow path, and a plunger that separates the pressure chamber and the secondary flow path from the pilot hole by energizing an electromagnetic coil. The electromagnetic valve according to the above, further comprising an operation means for flowing water in the pressure chamber to the secondary flow path by separating the plunger from the pilot hole by a rod inserted into the pilot hole.

According to this configuration, the plunger having a small pressure receiving area is separated from the pilot hole, and the water in the pressure chamber is caused to flow to the secondary flow path to discharge water. Water can be discharged by
Since the conventional bypass flow path is not required, downsizing and manufacturing cost reduction can be achieved.

[0013] The operating means is provided with automatic return means for seating the plunger in the pilot hole and interrupting the communication between the pressure chamber and the secondary flow path. By blocking communication with the road, forgetting to stop water can be prevented.

Further, the automatic return means is formed by urging means for urging the rod away from the plunger,
If the biasing means is formed by a spring member, it is possible to prevent forgetting to stop water with a simple configuration.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing a solenoid valve according to the present invention.

As shown in FIG. 1, the solenoid valve A includes a valve body 1
Valve seat 5 provided between the primary side flow path 3 and the secondary side flow path 4, and the diaphragm valve body 2 seated on and off the valve seat 5
And a pressure chamber 6 provided on the back side of the diaphragm valve body 2, a pilot hole 7 provided in the diaphragm valve body 2, and a plunger 9 which operates by energizing an electromagnetic coil 8.

A seat packing 10 is integrally provided at the tip of the plunger 9.
A spring 11 for urging the plunger 9 against the pilot hole 7 is interposed at the rear end of the spring.

On the other hand, a projection 13 projecting downward is provided in a lower portion of the valve body 1 at a position facing the diaphragm valve element 2, and an external thread 13 a is provided on the outer periphery of the projection 13.
Are formed. And the female screw 14 formed on the inner circumference
a holding member 14 having a
Is provided by screwing.

A manual operation button 15 is slidably provided on the inner peripheral portion of the projection 13, and a rod 17 is provided at the tip of the manual operation button 15 so as to extend therefrom. Are inserted into the pilot holes 7.

At the distal end of the manual operation button 15, a coil-shaped automatic return spring 1 as an urging means for urging the rod 17 to withdraw from the pilot hole 7 is provided.
8, a large diameter portion 15a of the manual operation button 15
Of the manual operation button 15 from the inner peripheral portion of the protrusion 13 by the automatic return spring 18 is regulated.

Also, at the rear end of the manual operation button 15,
Insert through the opening 13b provided in the holding member 14,
The small diameter portion 15b is provided so as to protrude from the end face of the holding member 14 by a predetermined length. The manual operation button 1
In the middle of the large diameter portion 15a of FIG. 5, an O-ring 16 as a sealing material is interposed.

In the above configuration, the operation of the solenoid valve A will be described in detail below.

In the drawing, the plunger 9 includes a spring 11
, The seat packing 10 provided in the plunger 9 closes the pilot hole 7 and shuts off the pressure chamber 6 and the secondary flow path 4. Further, since the pressure chamber 6 communicates with the primary side flow path 3 through the bleed hole 12 provided in the diaphragm valve body 2, the pressure of the pressure chamber 6 in this state is equal to the primary pressure, and therefore, the diaphragm valve Body 2
Is pressed against the valve seat 5 by the differential pressure between the primary pressure and the secondary pressure, and the primary flow path 3 and the secondary flow path 4 are shut off.

Here, when the electromagnetic coil 8 is energized by excitation, the plunger 9 is attracted against the spring 11 and separated from the pilot hole 7, so that the pressure chamber 6 and the secondary side flow path 4 are passed through the pilot hole 7. Communicates with Then, the pressure chamber 6
The diaphragm valve body 2 is rapidly pushed up by the differential pressure between the primary pressure and the pressure in the pressure chamber 6, and the primary flow path 3 and the secondary flow path 4 communicate with each other to discharge water. Will be

When the power supply to the electromagnetic coil 8 is stopped, the spring 1
1, the plunger 9 is pushed back, and the seat packing 10 provided in the plunger 9 closes the pilot hole 7 to shut off the pressure chamber 6 and the secondary flow path 4, so that the pressure in the pressure chamber 6 is reduced to the primary pressure. The diaphragm valve element 2 descends again and sits on the valve seat 5, and the primary side flow path 3 and the secondary side flow path 4
And shut off the water.

Next, when water is to be manually discharged at the time of a power failure or the like, the manual operation button 15 is pushed into the valve body 1 side.
The rod 17 inserted into the pilot hole 7 pushes up the plunger 9 against the spring 11, and the pressure chamber 6 and the secondary flow path 4 communicate with each other through the pilot hole 7, thereby attracting the plunger 9 by energization. Water can be spouted as in the case. At this time, since the pressure receiving area of the plunger 9 is very small as compared with the pressure receiving area of the diaphragm valve body 2,
The force required to manually push up may be very small.

Then, when the hand is released from the manual operation button 15, the manual operation button 15 is pushed back to the original position by the automatic return spring 18, and the seat packing 10 of the plunger 9 is closed by the spring 11 and the pressure is reduced. Since the chamber 6 and the secondary flow path 4 are shut off, the water stops automatically as in the non-energized state.

The contents described above relate only to one embodiment of the present invention, and do not mean that the present invention is limited only to the above contents. For example, the automatic return means is formed by the urging means. However, the present invention is not limited to this. The air may be compressed so that the manual operation button 15 returns to the original position. The manual operation button 15 may be returned to the original position by using.

Although the coil-like automatic return spring 18 is used as the biasing means, the invention is not limited to this, and a leaf spring or the like may be used.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing a conventional solenoid valve.

FIG. 3 is a sectional view showing another conventional solenoid valve.

FIG. 4 is a sectional view showing still another conventional solenoid valve.

[Explanation of symbols]

 A: Solenoid valve 1 ... Valve body 2 ... Diaphragm valve body 3 ... Primary side flow path 4 ... Secondary side flow path 5 ... Valve seat 6 ... Pressure chamber 7 ... Pilot hole 8 ... Electromagnetic coil 9 ... Plunger 13 ... Projection 14 … Holding member 15… Manual operation button 16… O-ring 17… Rod 18… Spring for automatic return

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H056 AA07 BB32 BB50 CA08 CA15 CC02 CC12 CD06 DD04 GG05 3H106 DA07 DA13 DA23 DB02 DB12 DB23 DB32 DC02 DC14 DC17 EE23 EE34 EE48 GC16 GC29 KK05

Claims (4)

[Claims] 1. A valve seat provided between a primary side flow path and a secondary side flow path, and water from the primary side flow path to the secondary side flow path when seated on the valve seat. A diaphragm valve body for preventing outflow, a pressure chamber provided on the back side of the diaphragm valve body, and a pilot hole provided on the diaphragm valve body for communicating the pressure chamber and the secondary side flow path, A plunger, which is separated from the pilot hole by energizing the electromagnetic coil to communicate the pressure chamber and the secondary side flow path, wherein the plunger is inserted into the pilot hole by a rod inserted into the pilot hole. An operating means for separating water from the pressure chamber and flowing the water in the pressure chamber to the secondary flow path. 2. The automatic control device according to claim 1, wherein said operating means is provided with automatic return means for seating said plunger in said pilot hole to cut off communication between said pressure chamber and said secondary flow path. The solenoid valve according to 1. 3. The solenoid valve according to claim 2, wherein said automatic return means is formed by an urging means for urging said rod to separate from said plunger. 4. The solenoid valve according to claim 3, wherein said urging means is formed by a spring member.