JPH0325482Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention uses an electromagnetically driven pilot valve to introduce and accumulate fluid on the inlet side into the back chamber of the main valve body that opens and closes the flow path, and to discharge it from there to the outlet side. This relates to pilot type solenoid valves that open and close the main valve body by
Used for piping.

Prior art and its problems A main valve seat of the main valve is formed between the inlet and outlet of the fluid, and the pilot valve seat of the pilot valve is provided on the main valve body that cooperates with the main valve seat to open and close the flow path. By opening and closing the pilot valve port using the pilot valve body provided on the plunger of the electromagnet, the back chamber of the main valve body is communicated with or disconnected from the outlet side, and by opening and closing this pilot valve, the fluid on the inlet side is communicated with the outlet side from the back chamber. In a pilot-type solenoid valve that opens and closes the main valve by releasing it to the side or introducing and accumulating it here, the main valve can be opened reliably even if the differential pressure between the inlet side and the outlet side is small. It has been proposed, for example, in U.S. Pat. No. 3,208,716 and U.S. Pat.

However, in these systems, both ends of the coil spring are engaged with flanges provided on the pilot valve body side and the opposing main valve body side, and when the coil spring is engaged, the both ends of the coil spring must be expanded or passed through the flanges. This requires special tools and is troublesome. Also, especially Utsukai Showa 58-187676
As can be seen in the drawing, the coil spring in the publication has a tight spring structure, so when the pilot valve is opened, when the fluid flows from the back chamber to the pilot valve port, it becomes an obstruction to the flow and prevents the main valve from opening quickly. There is a disadvantage that the valve cannot be operated, and there is a problem that the lift height of the pilot valve body must be increased in order to widen the pitch of the coil spring and reduce the flow resistance.

Purpose of the invention The present invention solves the above-mentioned problems of pilot-type solenoid valves in which the pilot valve body and the main valve body are connected by a coil spring, and allows the coil spring to be easily connected without the need for special tools. It is an object of the present invention to provide a pilot type solenoid valve that can be easily engaged and disengaged, and has a small lift and low flow resistance when the pilot valve is opened.

Composition of the Invention The present invention includes: a main valve seat formed between a fluid inlet and an outlet; a main valve body that cooperates with the main valve seat to communicate or block communication between the fluid inlet and the outlet;
A pilot valve seat provided on the main valve body, a back chamber formed at the back of the main valve body and communicating with the fluid inlet side, and a fluid outlet side cooperate with the pilot valve seat. A pilot type solenoid valve is provided with a pilot valve body provided on a plunger of an electromagnet for communicating or cutting off communication, and the pilot valve body and the main valve body are connected by a coil spring; It has a tight spring structure and an open spring structure in the middle,
Further, the main valve body and the pilot valve body are formed with threads having a diameter and a pitch larger than the inner diameter and pitch of both end portions of the coil spring at opposing portions, and the both end portions are screwed into the threads to be connected. The structure is as follows.

Embodiment An embodiment of the present invention will be explained based on the drawings. In FIG. 1, 1 is a main valve, 2 is a pilot valve, and 3 is an electromagnet. The main valve 1 has an inlet 4 and an outlet 5 for fluid. It has a valve body 7 with a main valve seat 6 formed therebetween, and a main valve element 10 consisting of a diaphragm 8 and a diaphragm receiver 9. When the diaphragm 8 contacts and seats on the main valve seat 6, the inlet is closed. 4
and exit 5 are blocked. The peripheral edge of the diaphragm 8 is sandwiched and fixed between the valve body 7 and the lid 11 stacked on it, and the back chamber 12 formed by the space surrounded by the main valve body 10 and the lid serves as a diaphragm receiver. 9 is loosely fitted into the inlet 13 provided in the diaphragm 8 and the diaphragm receiver 9.
It is constantly in communication with the inlet 4 through a gap with the periphery of the inlet.

The pilot valve 2 has a pilot valve seat 14 fixed to the center of the main valve body 10 and a pilot valve body 15 attached to the plunger 24 of the electromagnet 3.
When seated, the pilot valve port 16 is closed and the back chamber 12 and the outlet 5 side are cut off. The pilot valve body 15 is elastically attached to the plunger 24 by a spring 17, and the pilot valve seat 1
A cylindrical guide 18 is fixed to the lid 11.
Support piece 2 of the cylindrical part 19 extending upward of the back chamber 12 of
It is set to 0 so that it does not tilt.

The electromagnet 3 includes an electromagnetic coil 22 built in a coil case 21 placed on the lid 11, a plunger 24 fitted in a guide tube 23 at the center thereof,
When the current to the electromagnetic coil 22 is cut off and demagnetized, the plunger 24 descends and closes the pilot valve 2. When the electromagnetic coil 22 is energized and energized, the plunger 24 rises and closes the pilot valve 2. 2
Open the door.

When the pilot valve 2 is closed, the fluid in the inlet 4 is introduced into the back chamber 11 from the inlet 13 through the diaphragm receiver 9, and further passes around the guide 18 to reach the vicinity of the pilot valve body 15. Main valve body 10
are the fluid pressure in the back chamber 11, its own weight, the elastic force of the return spring 25, the plunger 24 and the pilot valve body 15.
The weight of the main valve seat 6 is added to the main valve seat 6, causing it to descend and sit on the main valve seat 6. Furthermore, when the pilot valve 2 is opened, the fluid in the back chamber 11 is released to the outlet 5 side, and the main valve body 10 controls the differential pressure between the inlet 4 side and the outlet 5 side that acts on the diaphragm 8, and the connection coil spring 26
due to the elastic force of the inlet 4 and away from the main valve seat 6.
and the exit 5 are communicated with each other.

The coil spring 26 for connection is connected to the pilot valve body 15.
The pilot valve element 15 and the main valve element 10 are connected to each other by being connected to a plunger 24 equipped with a pilot valve element 15 and a pilot valve seat 14 fixed to the main valve element 10.

As shown in FIG. 3, the coil spring 26 has a tight spring structure in which both end portions 27 and 28 are in contact with coiled wires, and an intermediate portion 29
It has an open spring structure in which the coiled wires are separated from each other. Also, as shown in FIG. 3, the outer circumferential surface of the lower end of the plunger 24 and the outer circumferential surface of the upper end of the pilot valve seat 14 have threads with a thread diameter and pitch larger than the inner diameter and pitch of the end portions 27 and 28. 30 and 31 are formed, respectively. The pitch of the screws 30, 31 is approximately 1.5 times the pitch of the end portions 27, 28.

In this embodiment, as shown in FIG.
and the main valve body 10 are connected, so that the coil spring 2
6 has both end portions 27 and 28 stretched and the screw 3
The pilot valve body 15 and the main valve body 10 are connected in a crimped state at 0 and 31, and act to pull the pilot valve body 15 and the main valve body 10 toward each other. Further, when the pilot valve 2 is closed, the intermediate portion 29 of the coil spring 26 is not compressed and maintains an open spring structure. Such a configuration, for example, allows one of the end portions 27 and 28 to
7 into the thread 30 of the plunger 24, and then the other end 28 is threaded into the thread 31 of the pilot valve seat 14 while rotating the plunger 24.

In addition, the screws 30 and 31 into which the coil spring 26 is screwed
It goes without saying that the valve body 10 may be provided directly on the pilot valve body 15 and the main valve body 10, and that the main valve body 10 may be constituted by a piston.

Effects of the invention According to the invention, a thread is formed directly or indirectly in the opposing parts of the main valve body and the pilot valve body, and both ends of the tension spring structure of the coil spring are screwed into the screw in a stretched state and connected. Therefore, by rotating either the coil spring, the pilot valve body, or the main valve body, even if the guide is provided surrounding the pilot valve body as in the illustrated embodiment, it can be connected very easily without using any special tools. Or, on the contrary, it can be disassembled, and both ends of the tight spring structure of the coil spring are stretched and screwed onto the screws in a crimped state, so they are firmly connected without worrying about loosening or coming off. In addition, the middle part of the coil spring has an opening spring structure, and when the pilot valve is opened, the pitch is further expanded, so there is little resistance to the fluid discharged from the back chamber to the outlet side. Even if the lift height of the main valve is made small, the main valve can be opened quickly.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is an enlarged partial view thereof, and FIG. 3 is an exploded sectional view of a coil spring and a screw. 1... Main valve, 2... Pilot valve, 3... Electromagnet, 4... Inlet, 5... Outlet, 6... Valve seat, 7...
... Valve body, 10 ... Main valve body, 12 ... Back chamber, 14
...Pilot valve seat, 15...Pilot valve body,
24...Plunger, 26...Coil spring, 2
7, 28... Both ends, 29... Middle part, 3
0,31...screw.

Claims (1)

[Claims for Utility Model Registration] A main valve seat 6 formed between a fluid inlet 4 and an outlet 5, and a fluid inlet 4 and an outlet 5 that cooperate with the main valve seat 6 to communicate or communicate with each other. Main valve body 1 to shut off
0, a pilot valve seat 14 provided on the main valve body 10, a back chamber 12 formed at the back of the main valve body 10 and communicating with the fluid inlet 4 side, and a fluid outlet 5 side. A pilot valve body 15 is provided on the plunger 24 of the electromagnet 3 to cooperate with the pilot valve seat 14 to communicate or cut off the valve, and the main valve body 10 and the pilot valve body 15 are connected by a coil spring 26. In the pilot type solenoid valve, the coil spring 26 has both end portions 27 and 28 of a tight spring structure, and an intermediate portion 29 of an open spring structure, and the main valve body 10 and the pilot valve body 15 have opposing portions. Threads 30, 31 are formed in the inner diameter and pitch of both end portions 27, 28 of the coil spring 26, and the threads 30, 31 have a thread diameter and pitch larger than the inner diameter and pitch of the end portions 27, 28 of the coil spring 26, and the end portions 27, 28 are
A pilot-type solenoid valve that is screwed into and connected to 1.