JPH04125377A - Pilot controlled solenoid valve - Google Patents

Abstract

PURPOSE:To prevent adherence/deposition of impurities in fluid and hence to aim at enhancement in reliability of a solenoid valve for a long period and in miniaturization thereof by providing a pilot diaphragm for partitioning a pilot chamber into both solenoid and pilot valve seat sides. CONSTITUTION:In opening of a piping, although the main stream is directed along the piping, a part of fluid is made to flow through an orifice 31 to a first pressure chamber 15, and is then led from an intercommunicating pipe 11 through a pilot valve seat 10 to a discharge side 6a. In this case, the solenoid 4 is so constituted as not to be in contact with a part of the fluid by means of a pilot diaphragm valve 17, and is thus prevented from adherence/deposition of impurities such as iron and calcium. Accordingly, the plunger 16 is prevented from galling thereby being enhanced in the reliability for a long period. Further, a second pressure chamber 15' is provided between the pilot diaphragm 17 and the solenoid 4, and is also sealed to be prevented from invasion of external refuse. Therefore, it is possible to secure operation of the plunger 16 for a long period.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a pilot-operated solenoid valve, and specifically relates to a technique for increasing reliability.

[Prior Art] Conventionally, as shown in FIG. 9, by energizing a coil 19, the main valve body 9 is opened to allow water to flow. FIG. 9 shows the main valve body 9 in a closed state. The fluid conduit in the valve body 2 is divided into a water inlet 5 and a water outlet 6 by a cylindrical valve seat 18, and above the valve seat 18 is a main valve body 9 integrated with a diaphragm D. The lower surface of the central portion of the main valve body 9 faces the water spout 6 , and the lower surface of the peripheral edge of the main valve body 9 faces the water supply port 5 .

A pressure chamber F is provided above the main valve body 9 and communicates with the water supply port 5 side through an orifice 31 (formed by an orifice pipe) formed on the periphery of the main valve body 9. The chamber F communicates with the water spout 6 side through a pilot pipe H provided in the center of the main valve body 9.

Above the pressure chamber F is a solenoid 4 integrated with the lid 3.
is installed. The solenoid 4 includes a coil 19, a plunger 16 made of a rod-shaped piston, a return spring 22, and a pilot valve M disposed at the tip of the plunger 16.

In the operation of the pilot type solenoid valve Aa configured in this way, the pilot pipe H is always closed by the biasing force of the return spring 22.

When the pilot pipe H is closed, the pressure Fa in the pressure chamber F becomes the same pressure as the water supply port 5 through the orifice 31, so the main valve body 9 descends due to the elastic properties of the diaphragm D, and the valve seat 18 The conduit is closed in contact with the

When opening the pipe, the coil 19 of the solenoid 4 is energized, the plunger 16 is pulled up, and the pilot pipe H is opened.
When the pilot pipe H is opened, the fluid in the pressure chamber F flows to the water outlet 6 through the pilot pipe H, so the pressure chamber F
The pressure at the water supply port 5 decreases, and the main valve body 9 is pushed upward by the pressure at the water supply port 5, opening the pipe.

However, the pilot type solenoid valve Aa of the above-mentioned prior art
When the pilot pipe H is opened and the main valve body 9 is raised, the main flow of fluid flows through the pipe when the pipe is open, but some fluid flows inside the pressure chamber F through the orifice 31. , and merges with the main flow below the main valve body 9 through the pilot pipe H.

Therefore, the plunger 16 is always exposed to the flowing fluid (when the pipe is open), and the plunger 16
Impurities in the fluid (iron, calcium, etc.) adhere to and accumulate in the gap between the plunger 6 and the guide pipe R surrounding the plunger 16, causing the plunger 16 to become stuck and malfunction.

In addition, the conventional pilot type solenoid valve Aa has a pilot pipe H.
is provided on the main valve body 9 to make the operating stroke of the plunger 16 correspond to the operating stroke of the main valve body 9.
As the solenoid 4 becomes larger, the volume of the pilot-operated solenoid valve Aa itself becomes larger, so as the solenoid 4 becomes larger, the driving voltage becomes higher, which poses a safety problem.Furthermore, since it is a full-time type, power consumption is large and energy saving is required. There was a problem with sexuality.

[Problem to be solved by the invention] The present invention has been made in view of these problems,
The purpose of this is to prevent the adhesion and accumulation of impurities in the fluid and improve the long-term reliability of the solenoid.
An object of the present invention is to provide a pilot type solenoid valve that can be downsized.

[Means for Solving the Problems] The pilot type solenoid valve of the present invention is partitioned by the main valve body 9 and is connected to the main valve body 9 through the orifice 31. A first pressure chamber 15 that communicates with the upstream side of
1, a pilot valve seat 10 that opens and closes the communication pipe 11 by the driving force of the solenoid 4, and this pilot valve seat 10.
It is characterized in that it is equipped with a pilot chamber 14 in which the pilot valve seat 10 is housed, and a pilot diaphragm valve 17 that opens and closes the pilot valve seat 10 and separates the pilot chamber 14 into the solenoid 4 side and the pilot valve seat 10 side. be.

Further, the second pressure chamber 15' is formed on the solenoid 4 side of the pilot diaphragm valve 17, and this second pressure chamber 15' is characterized in that it is sealed.

Further, the second pressure chamber 15' is characterized in that it is opened to atmospheric pressure.

It is also characterized in that it includes a pressure introduction pipe 28' communicating with the second pressure chamber 15' and the downstream side of the main valve body 9, and a pilot valve seat 10 is arranged on the fluid inflow side of the pilot chamber 14. It is something.

It is also characterized in that it is equipped with a pressure introduction pipe 28' that communicates the second pressure chamber 15' and the first pressure chamber 15, and that a pilot valve seat 10 is arranged on the fluid discharge side of the pilot chamber 14. It is something.

Further, the solenoid 4 is characterized by being a self-holding type solenoid 4 that can attract the plunger 16 upwardly or press down and hold it downwardly by means of a permanent magnet 21 and a return spring 22 arranged inside.

Also, a second pressure chamber 15' formed on the solenoid 4 side of the pilot diaphragm valve 17, and a pressure introduction pipe 28' communicating with the second pressure chamber 15' and the downstream side of the main valve body 9.
The pilot valve seat 10 is disposed on the fluid discharge side of the pilot chamber 14.

It is also characterized in that it is equipped with a pressure introduction pipe 28' that communicates the second pressure chamber 15' and the first pressure chamber 15, and that the pilot valve seat 10 is arranged on the fluid inflow side of the pilot chamber 14. That is.

[Function] In this way, - the first pressure chamber 15 is partitioned by the main valve body 9 and communicates with the upstream side of the main valve body 9 through the orifice 31; A communication pipe 11 communicating with the water discharge side of the body 9 and a solenoid 4
A pilot valve seat 10 that opens and closes the communication pipe 11 with the driving force of By providing a pyro-soto diaphragm valve 17 separating the pilot valve seat 10 and the pilot valve seat 10, the flowing fluid can be connected to the plunger 16R of the solenoid 4 as in the conventional case. Since it does not come into contact with the guide vibe, impurities in the fluid do not adhere or accumulate.

In addition, a second pressure chamber 15' is formed on the solenoid 4 side of the pilot diaphragm valve 17, and since this second pressure chamber 15' is sealed, no impurities from the outside will adhere to it. do not.

Further, by opening the second pressure chamber 15' to atmospheric pressure, the plunger 16 can move smoothly.

Further, a pressure introduction pipe 28' communicating with the second pressure chamber 15 and the downstream side of the main valve body 9 is provided, and the pilot valve seat 10 is disposed on the fluid inflow side of the pilot chamber 14, so that the pilot diaphragm valve 17 The upper and lower pressures of are the same,
The pilot diaphragm valve 17 can be easily operated even with a small driving force.

In addition, by providing a pressure introduction pipe 28'' that communicates the second pressure chamber 15' and the first pressure chamber 15, and arranging the pilot valve seat 10 on the fluid discharge side of the pilot chamber 14,
The upper and lower pressures of the pilot diaphragm valve 17 are always the same, and the pilot diaphragm valve 17 can be easily operated even with a small driving force.

In addition, the solenoid 4 is configured as a self-holding type solenoid 4 that can attract the plunger 16 upward or push down and hold the plunger 16 downward using a permanent magnet 21 and a return spring 22 disposed inside, thereby driving the electromagnetic valve. Opening/closing operations and maintaining the open/closed state can be performed by simply turning on electricity only at certain times, resulting in power savings and miniaturization.

Also, a second pressure chamber 15' formed on the solenoid 4 side of the pilot diaphragm valve 17, and a pressure introduction pipe 28' communicating with the second pressure chamber 15' and the downstream side of the main valve body 9.
Since the pilot valve seat 10 is arranged on the fluid discharge side of the pilot chamber 14, the pilot diaphragm valve 1
The vertical pressure of the valve 7 is always the same, and the pilot diaphragm valve 17 can be easily operated with a minute driving force like a self-holding solenoid 4.

Furthermore, a pressure introduction pipe 28' is provided that communicates the second pressure chamber 15' and the first pressure chamber 15, and the pilot valve seat 10 is disposed on the fluid inflow side of the pilot chamber 14, so that the pilot diaphragm valve 17 is always the same pressure, and the pilot diaphragm valve 17 can be easily operated even with a minute driving force such as that of a self-holding solenoid 4 [Example] The following is an example of the present invention based on the drawings. 1 to 3, which will be described in detail, show a first embodiment of the present invention, and this pilot type solenoid valve A has a main valve body 9 and a cylindrical valve seat 18 on the water supply side 5a on the outer periphery. It has a structure in which a solenoid 4 that controls opening and closing of a main valve body 9 is provided with a water supply port 5 and a water spout 6 that communicate with each other. Water passed through the water supply port 5 passes through the inside of the valve seat 18 and flows to the water spout 6. The main valve body 9 is integrated with a diaphragm 9' whose peripheral edge is fixed, and the lower surface of the central part of the main valve body 9 is on the water discharge side 6.
a, and the lower surface of the peripheral edge of the main valve body 9 faces the water supply side 5a.

A first pressure chamber 15 is provided above the main valve body 9 and communicates with the water supply side 5a through an orifice 31 of an orifice pipe formed on the periphery of the main valve body 9. 1
5 communicates with the pilot chamber 14 through a communication pipe 32. The pilot chamber 14 has a pilot valve seat 1 provided on the lid 3.
0 and the connecting pipe 11 provided in the valve body 2 via the packing 12.
It communicates with the water spout 6a.

Above the pilot chamber 14, a solenoid 4 is attached to the pilot chamber 14 via a pilot diaphragm valve 17, which is screwed into a female thread provided on the lid 3.

The solenoid 4 includes a coil 19, a plunger 16 serving as a rod-shaped piston, and a return spring 22.

When the plunger 16 in the solenoid 4 is lowered and the pilot diaphragm valve 17 is pressed to close the pilot valve seat 10, the first pressure chamber 15 is connected to the orifice 31,
Since they are communicated through the communication pipe 32, the pressure is the same as the pressure on the water supply side 5a, and the main valve body 9 is connected to the diaphragm 9'.
Due to its elasticity, it descends and contacts the valve seat 18, closing the pipeline.

Further, when the plunger 16 rises and the pilot diaphragm valve 17 connected to the plunger 16 also rises, the pilot valve seat 10 opens, and the pressure in the first pressure chamber 15 becomes the same pressure as the pressure on the water discharge side 6a. , the pressure becomes lower than the pressure on the water supply side 5a, so the main valve body 9 is pushed by the pressure on the water supply side 5a and rises, opening the pipeline.

When the pilot valve seat 10 is opened and the main valve body 9 is raised to open the pipeline, the main flow of the fluid flows through the pipeline, but some fluid flows through the orifice 31 into the first pressure chamber 15. , flows from the pilot chamber 14, through the pilot valve seat 10, and from the communication pipe 11 to the water discharge side 6a.

At this time, the pilot diaphragm valve 17 prevents the part of the fluid north of 1 from coming into contact with the solenoid 4, which prevents impurities (iron, calcium, etc.) in the fluid from adhering or accumulating. This prevents the plunger 16 from sticking and provides long-term reliability.

Further, a second pressure chamber 15' is configured between the pilot diaphragm valve 17 and the solenoid 4. This second pressure chamber 15' is in a sealed state, and no dust or the like from the outside can enter, so that the operation of the plunger 16 can be guaranteed semi-permanently, and long-term reliability can be obtained.

FIG. 4 shows a second embodiment, in which the chamber in which the plunger 16 is moved is formed as a second pressure chamber 15', and this second pressure chamber 15' is communicated with the outside through an intake pipe 29. The pressure is always maintained at the same pressure as atmospheric pressure. In this way, the second pressure chamber 15' communicates with the atmosphere, and the back pressure of the pilot diaphragm valve 17 is always constant. The driving force of the plunger 16 and this back pressure provide the force to operate the pilot diaphragm valve 17 up and down, and as a result, the driving force of the plunger 16 can be reduced.
Therefore, it becomes possible to further downsize the solenoid 4. (However, this is possible only when the fluid pressure is low.) Figure 5 shows a third embodiment, in which the second pressure chamber 15'
is equipped with a pressure introduction pipe 28 that communicates with the water discharge side 6a on the downstream side of the main valve body 9, and the pilot valve seat 10 is connected to the pilot chamber 1.
4 on the fluid inflow side. Therefore, the second pressure chamber 15' and the pilot chamber 14 are always at the same pressure via the pressure introduction pipe 28 and the communication pipe 11, that is, the upper and lower pressures of the pilot diaphragm valve 17 constructed between them are the same. The vertical movement can be performed very smoothly. At this time, the fluid enters the second pressure chamber 15', but only by the amount of the operating stroke of the pilot diaphragm valve 17, so the adhesion and accumulation of impurities is not promoted and there is no problem.

FIG. 6 shows a fourth embodiment, in which the second pressure chamber 15'
is provided with a pressure introduction pipe 28' communicating with the first pressure chamber 15, and a pilot valve seat 10 is arranged on the fluid discharge side of the pilot chamber 14. Therefore, the second pressure chamber 15' and the pilot chamber 14 are always at the same pressure via the pressure introduction pipe 28 and the communication pipe 11, that is, the upper and lower pressures of the pilot diaphragm valve 17 constructed between them are the same.
The vertical movement can be performed very smoothly. At this time, the fluid enters the second pressure chamber 15', but only by the amount of the operating stroke of the pilot diaphragm valve 17, so that adhesion and accumulation of impurities is not promoted and there is no problem.

FIG. 7 shows a fifth embodiment, in which the solenoid 4 is constructed as a self-holding type. That is, the structure of the solenoid 4 is such that when the coil 19 is energized so that the plunger 16 rises, the raised plunger 16 is attracted to the iron core 23 magnetized by the permanent magnet 21, and even when the energization is stopped, the coil 19 is energized. The pilot valve seat lO remains open and the conduit remains open. Conversely, coil 1
When a magnetic force is generated to pull up the plunger 16 by energizing the coil 19, the plunger 16 disengages from the iron core 23, and even if the coil 19 is de-energized by the return spring 22, the plunger 16 remains a solenoid. This is to maintain the state where it protrudes from 4. By providing such a self-holding solenoid 4, the plunger 16 can open and close the solenoid valve with a small stroke, the solenoid 4 becomes compact, and as a result, it operates at a low voltage, and the permanent magnet 21 can be moved upward Since the solenoid valve is maintained at
This is a highly safe solenoid valve. In this fifth embodiment, the self-holding type solenoid 4 is provided, and a fifth
Since it has the same configuration as the embodiment disclosed in the figure, it has the advantage of a self-holding type solenoid 4, and at the same time can operate even with a solenoid 4 such as a self-holding type solenoid 4 whose driving force of the plunger 16 is weak. You will be able to do it very smoothly.

FIG. 8 shows the sixth embodiment, which is equipped with a self-holding solenoid 4 and has the same configuration as the embodiment shown in FIG. 6, so it has the advantage of the self-holding solenoid 4. At the same time, even a solenoid 4 such as a self-holding solenoid 4 whose driving force of the plunger 16 is weak can be operated very smoothly.

In all the examples described above, the water supply population is 5.
Although the water outlet 6 and the spout 6 are arranged in substantially perpendicular directions, the arrangement position is not particularly limited, and various design changes can be made.

[Effects of the Invention] In summary, the present invention has a first pressure chamber that is partitioned by the main valve body and communicates with the upstream side of the main valve body through an orifice; A communication pipe that communicates with the water discharge side, a pilot valve seat that opens and closes the communication pipe by the driving force of a solenoid, and a pilot chamber that houses this pilot valve seat, and opens and closes the pilot valve seat. Since it is equipped with a pilot diaphragm valve that separates the pilot chamber into the solenoid side and the pilot valve seat side, the flowing fluid does not come into contact with the solenoid plunger or guide vibe as in the past, so impurities in the fluid do not adhere or There is no accumulation, which has the advantage of preventing the plunger from sticking and providing long-term reliability.

In addition, there is a second pressure chamber formed on the solenoid side of the pilot diaphragm valve, and since this second pressure chamber is sealed, no impurities from the outside adhere to it, further increasing long-term reliability. There are advantages.

In addition, since the second pressure chamber is open to atmospheric pressure, the plunger moves smoothly and the driving force of the plunger can be reduced, making it possible to downsize the solenoid.
It also has the advantage of not requiring a large space for installation.

In addition, it is equipped with a pressure introduction pipe that communicates with the second pressure chamber and the downstream side of the main valve body, and a pilot valve seat is placed on the fluid inflow side of the pilot chamber, so that the upper and lower pressures of the pyro-sotodiaphragm valve are the same. Therefore, the pilot diaphragm valve can be easily operated even with a small driving force. Therefore, there is an advantage that the solenoid can be made smaller and does not require a large space for installation.

Furthermore, since a pressure introduction pipe is provided that communicates the second pressure chamber and the first pressure chamber, and a pilot valve seat is arranged on the fluid discharge side of the pilot chamber, the upper and lower pressures of the pilot diaphragm valve are always the same. The pilot diaphragm valve can be easily operated even with a small driving force. Therefore, there is an advantage that the solenoid can be made smaller and does not require a large space for installation.

In addition, the solenoid is configured as a self-holding type solenoid that can attract the plunger upward or push it downward and hold it using the permanent magnet and return spring placed inside, so it only needs to be energized when the solenoid valve is activated. It has the advantage of being able to open/close and maintain the open/closed state, saving power and increasing safety.

Further, the pilot valve is provided with a second pressure chamber formed on the solenoid side of the pilot diaphragm valve, and a pressure introduction pipe communicating with the second pressure chamber and the downstream side of the main valve body, and a pilot valve on the fluid discharge side of the pilot chamber. Since the seat is arranged, the upper and lower pressures of the pilot diaphragm valve are always the same pressure, which has the advantage that the pilot diaphragm valve can be easily operated with a minute driving force like a self-holding solenoid.

In addition, it is equipped with a pressure introduction pipe that communicates the second pressure chamber and the first pressure chamber, and a pilot valve seat is placed on the fluid inflow side of the pilot chamber, so that the upper and lower pressures of the pilot diaphragm valve are always the same pressure. This has the advantage that the pilot diaphragm valve can be easily operated even with a minute driving force like a self-holding solenoid.

[Brief explanation of the drawing]

Fig. 1 is a side view of one embodiment of the present invention, the second section is a plan view with the solenoid and lid removed, Fig. 3 is a cross-sectional view of the same, and Fig. 4 is a cross-section of the second embodiment of the same. Figure 5 is a cross-sectional view of the third embodiment of the same, Figure 6 is a cross-sectional view of the fourth embodiment of the same, Figure 7 is a cross-sectional view of the fifth embodiment of the same, and Figure 8 is a cross-sectional view of the fifth embodiment of the same. A sectional view of the sixth embodiment and FIG. 9 are sectional views of a conventional example. 2... Valve main body, 4... Solenoid, 9... Main valve body,
10...Pilot valve seat, 11...Communication pipe, 14...
・Pilot chamber, 15...first pressure chamber, 16...
Plunger, 17... pilot diaphragm valve,
31... Orifice. Agent Patent Attorney Ishi 1) Chief Figure 7 Figure 2 Figure 4...Tsuremaid 9...Main valve body] 0...Pilot valve seat 11...Communication pipe 14...Pilot chamber 15... First pressure chamber 16... Plunger 17... Pilot diaphragm valve 31... Orifice Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Procedural amendment self-proposed) Heisei January 19, 1990 Patent Application No. 245311 2゜Name of the inventionRelationship with the pilot operated solenoid valve 4゜Amendment case Patent applicant address 1048 Kadoma, Kadoma City, Osaka Prefecture Name (58
3) Toshio Miyoshi, Representative of Matsushita Electric Works Co., Ltd.

Claims (1)

[Scope of Claims] [1] A first pressure chamber that is partitioned by the main valve body and communicates with the upstream side of the main valve body through an orifice, and communicates this pressure chamber with the water discharge side of the main valve body. A pilot valve seat that opens and closes the communication pipe using the driving force of a solenoid, and a pilot chamber that houses the pilot valve seat. A pilot-operated solenoid valve characterized by comprising a pilot diaphragm valve separating the side and the pilot valve seat side. [2] The pilot-operated solenoid valve according to claim 1, further comprising a second pressure chamber formed on the solenoid side of the pilot diaphragm valve, the second pressure chamber being hermetically sealed. [3] The pilot type solenoid valve according to claim 1, wherein the second pressure chamber is open to atmospheric pressure. [4] The pilot according to claim 1, comprising a pressure introduction pipe communicating with the second pressure chamber and the downstream side of the main valve body, and a pilot valve seat arranged on the fluid inflow side of the pilot chamber. type solenoid valve. [5] The pilot according to claim 1, comprising a pressure introduction pipe communicating the second pressure chamber and the first pressure chamber, and a pilot valve seat arranged on the fluid discharge side of the pilot chamber. type solenoid valve. [6] The pilot type electromagnetic device according to claim 1, wherein the solenoid is a self-holding type solenoid that can attract the plunger upward or push it downward and hold it using a permanent magnet and a return spring disposed inside. valve. [7] A second pressure chamber formed on the solenoid side of the pilot diaphragm valve, and a pressure introduction pipe communicating with the second pressure chamber and the downstream side of the main valve body, and a pilot on the fluid discharge side of the pilot chamber. 7. The pilot type solenoid valve according to claim 6, further comprising a valve seat. [8] The pilot according to claim 6, comprising a pressure introduction pipe communicating the second pressure chamber and the first pressure chamber, and a pilot valve seat arranged on the fluid inflow side of the pilot chamber. type solenoid valve.