JP3114840B2 - Pilot operated solenoid valve for hot water flush toilet seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pilot type solenoid valve, and more particularly to a pilot type solenoid valve in which a diaphragm valve operates smoothly at low pressure.

[0002]

2. Description of the Related Art Conventionally, a diaphragm valve has been used as a main valve as a solenoid valve for opening and closing a large-capacity flow with a small amount of electric power, and a pilot valve, which is a solenoid valve, has been provided as a sub-valve for driving and controlling the main valve. A so-called pilot-type solenoid valve is used in which the pressure applied to the diaphragm valve is changed by opening and closing the pilot valve by energizing excitation, and the main valve is moved by the change in pressure to open and close the main valve. FIG. 7 is a sectional view showing the structure of a conventional pilot type solenoid valve.
The diaphragm valve element 12 as a main valve element is made of a rigid plastic diaphragm body 13 and an ethylene propylene terpolymer rubber, and has a thickness of 0.45 m.
m or more of the diaphragm rubber 14 is integrally formed. The diaphragm rubber 14 has a main valve structure 17 having a holding portion 14 a formed around the diaphragm rubber 14.
The bottom surface of the diaphragm rubber 14 is in contact with the main valve structure 17.
Abuts on the main valve seat 27 formed at the bottom.

An input port 23 is formed on the left side of the main valve structure 17, and an output port 25 is formed on the right side. The diaphragm rubber 14 blocks or connects the input port 23 and the output port 25 by contacting or separating from the main valve seat 27. Diaphragm rubber 1
A bleed hole 22 is formed on the surface of the diaphragm 4, which is in contact with the input port 23, to communicate the input port 23 with the diaphragm back chamber 26. A pilot valve hole 21 is formed in the center of the diaphragm center portion 13. At an upper end of the pilot valve hole 21, a pilot valve seat 13a is formed. In FIG. 7, a pilot valve body 20 fixed to the movable iron core 16 is in contact with the pilot valve seat 13a. The movable iron core 16 is slidably held in a hollow portion of a coil 18 around which a conductive wire is wound. The movable iron core 16 is urged by a return spring 19 in a direction in which the pilot valve body 20 comes into contact with the pilot valve seat 13a.

Next, the operation of the conventional pilot type solenoid valve having the above configuration will be described. FIG. 7 shows a diaphragm valve element 1.
2 is in contact with the main valve seat 27 and the input port 23 and the output port 25 are shut off. At this time, the coil 18 is not energized, the movable iron core 16 is urged downward by the return spring 19, and the pilot valve body 20 is in contact with the pilot valve seat 13a. Thus, the diaphragm back chamber 26 and the pilot valve hole 21 are shut off. The balance of forces in this state will be described. At the input port 23, a fluid having a predetermined pressure exists. Fluid can flow into the diaphragm back chamber 26 through the bleed hole 22, and the pressure of the fluid acts on the entire upper surface of the diaphragm valve body 12 and urges the diaphragm valve body 12 downward. On the other hand, the input port 23
The fluid acts on the peripheral portion of the diaphragm valve body 12 and urges the diaphragm valve body 12 upward. here,
The area where the fluid acts on the diaphragm valve body 12 is:
Since the upper surface is wide, the diaphragm valve body 12 is urged downward, and the diaphragm valve body 12 comes into contact with the main valve seat 27.

Next, when the coil 18 is energized, the movable iron core 16 is attracted upward by the magnetic field generated by the coil 18, and the attracting force overcomes the spring force of the return spring 19,
The movable iron core 16 moves upward, and the pilot valve body 20 separates from the pilot valve seat 13a. As a result, the fluid in the diaphragm back chamber 26 flows to the output port 25 via the pilot valve hole 21, and the pressure of the fluid in the diaphragm back chamber 26 decreases. The area of the bleed hole 22 is smaller than the area of the pilot valve hole 21, and the amount of fluid flowing from the diaphragm back chamber 26 to the output port 25 is smaller than that of the fluid added from the input port 23 to the diaphragm back chamber 26. Because it is more than quantity. When the pressure of the fluid in the diaphragm back chamber 26 decreases, the force acting upward on the diaphragm valve body 12 becomes greater than the force acting downward, and the diaphragm valve body 12 is moved upward, and the diaphragm valve body is moved upward. 12 is separated from the main valve seat 27. Thereby, the input port 23 and the output port 25 are communicated,
Fluid flows from input port 23 to output port 25.

[0006]

However, the above-mentioned conventional pilot-type solenoid valve has the following problems. That is, when the pressure of the fluid supplied to the input port 23 is low, or when the flow rate flowing from the input port 23 to the output port 25 is as small as about 0.5 to 10 liters / minute, there is a problem that abnormal noise occurs. is there. For example, in the warm water washing flight seat, due to the low normal discharge pressure, the differential pressure at the diaphragm valve is as low as 0.1 Kg / cm ² or so, using a flow rate is also as small as about 1 liter / minute degree.

[0007] When the pressure difference at the diaphragm valve is low, the operation of separating the diaphragm valve body 12 from the main valve seat 27 when the diaphragm valve body 12 is opened tends to be unstable. Since the fluid flows out of the diaphragm back chamber to the output port, while the fluid flows from the input port to the diaphragm back chamber through the bleed hole, the pressure of the water in the diaphragm back chamber is not uniform. If the differential pressure at the diaphragm valve is low, the movement of the diaphragm valve becomes slow, and due to uneven pressure of the diaphragm back chamber, the diaphragm valve body 12 is inclined, and water is partially discharged from the inclined part. Gushing. This spouting of water produces abnormal noise. In addition, the fact that the flow rate is small means that the diaphragm valve element 12 repeatedly contacts and separates from the main valve seat 27. Therefore, it becomes that the noise occurs repeatedly, there has been a problem that inspire a sense of anxiety to the user of the hot water washing flight seat. In addition, when using the warm water washing flight seat at night, noise is the noise, which is a problem.

[0008] The present invention has been made to solve the problems of the prior art, hot water washing flight seat, etc., even if the differential pressure of the fluid at the diaphragm valve is used in a low state, abnormal noise An object of the present invention is to provide a pilot-type solenoid valve that does not need to be operated.

[0009]

In order to solve the above-mentioned problems, a pilot type solenoid valve of the present invention comprises a diaphragm valve for opening and closing a main valve hole, a diaphragm back chamber formed in the diaphragm valve and a main valve hole. A pilot-type solenoid valve having a bleed hole communicating with the input port, a pilot valve hole formed in the diaphragm valve and communicating the diaphragm back chamber with the output port of the main valve hole, and a movable iron core for opening and closing the pilot valve hole. The magnitude of the drag when the center position of the diaphragm valve changes by 0.5 mm between when the diaphragm valve is in a no-load state and when an upward drag is applied to the center of the diaphragm valve is defined as the diaphragm drag. , The diaphragm drag is 90 grams or less.

In the above-mentioned pilot type solenoid valve,
The diaphragm valve is composed of a rigid body constituting a central portion, and an elastic body connected to the periphery of the rigid body, and the elastic body is fluorine rubber, and the thickness of the elastic body displacement portion that moves the diaphragm valve is reduced. It is characterized by being not more than 0.45 mm. Further, in the pilot solenoid valve, the diaphragm valve includes a rigid body constituting a central portion, and an elastic body connected around the rigid body, and the elastic body is ethylene propylene terpolymer rubber, It is characterized in that the thickness of the elastic body displacement portion that moves the diaphragm valve is 0.4 mm or less.

[0011]

In the pilot solenoid valve according to the present invention having the above-described structure, when the coil is not energized, the pilot valve body fixed to the movable iron core blocks the pilot valve hole. Thus, the fluid pressure at the input port acts on the diaphragm back chamber, and the diaphragm valve blocks the main valve hole. When the coil is energized, the movable iron core is attracted by the magnetic field generated by the coil, the pilot valve body opens the pilot valve hole, and connects the diaphragm back chamber and the output port. As a result, the fluid in the diaphragm back chamber flows to the output port side, the force acting downward on the diaphragm valve decreases, the diaphragm valve moves upward, the main valve hole is opened, and the input port and the output port are opened. And communicate.

The differential pressure at the diaphragm valve is 0.1 kg /
If there is only about ² cm2, even if the coil is energized to open the pilot valve hole and the diaphragm back chamber communicates with the output port, the differential pressure of the fluid between the diaphragm back chamber and the output port is low. It takes time for the fluid in the chamber to flow to the output port. On the other hand, a small amount of fluid flows into the back chamber of the diaphragm from the input port through the bleed hole. Therefore, the pressure of the fluid in the back chamber of the diaphragm is not uniform. Also, since there is a tolerance in the thickness of the displacement portion having the function of driving the diaphragm valve, when the differential pressure of the fluid used in the pilot solenoid valve is low, the diaphragm valve is partially inclined, It is easy to cause a fluid to be ejected from the water.

In the diaphragm valve according to the present invention, since the elastic body constituting the diaphragm valve is made of fluorine rubber and the thickness of the displacement part of the elastic body is set to 0.45 mm or less, the case where the diaphragm valve is in a no-load state is used. When the upward resistance is applied to the center of the diaphragm valve, the magnitude of the resistance when the center position of the diaphragm valve changes by 0.5 mm is defined as the diaphragm resistance, and the diaphragm resistance can be 90 grams or less, and the fluid differential pressure can be reduced. Is low, the diaphragm valve can be moved without tilting as much as possible. This allows
Abnormal noise generated by the ejection of the fluid can be eliminated. Further, in the diaphragm valve of the present invention, ethylene propylene terpolymer rubber is used for the elastic body constituting the diaphragm valve, and the thickness of the displacement portion of the elastic body is set to 0.4 mm or less, so that the diaphragm valve is in a no-load state. When the upward resistance is applied to the center of the diaphragm valve, the magnitude of the resistance when the center position of the diaphragm valve changes by 0.5 mm is defined as the diaphragm resistance, and the diaphragm resistance can be reduced to 90 g or less. , The diaphragm valve can be moved without tilting as much as possible. Thereby, the abnormal noise generated by the ejection of the fluid can be eliminated.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pilot type solenoid valve embodying the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a pilot-type solenoid valve 11 of the present embodiment. Since the structure is almost the same as that of the conventional pilot type solenoid valve, the same parts are denoted by the same reference numerals. FIG. 3 shows a detailed structure of the diaphragm valve body 12 as the main valve body. In the diaphragm valve element 12, a diaphragm central portion 13 which is a plastic rigid body and a diaphragm rubber 14 which is made of fluoro rubber are integrally formed by an insert molding machine. The diaphragm rubber 14 is located at the center 1 of the diaphragm.
3 is composed of a lower surface portion 14c that is integrally attached to 3, a displacing portion 14b having an inverted U-shaped cross section to move the diaphragm center portion 13 up and down, and a holding portion 14a formed on the outer periphery. Here, the thickness of the displacement portion 14b is 0.45
mm.

On the other hand, a pilot valve hole 21 is formed in the center of the diaphragm center portion 13. A pilot valve seat 13a is formed at the upper end of the pilot valve hole 21. A bleed hole 22 is formed on the left side of the center of the diaphragm center portion 13 and in contact with the input port 23, and the input port 23 and the diaphragm back chamber 2 are formed.
6 is communicated. Here, the bleed hole 22 is constituted by holes indicated by 22a, 22b and 22c in FIG. Diaphragm valve element 12 is attached to main valve structure 17 by holding portion 14 a of diaphragm rubber 14. Here, in FIG. 1, the lower surface portion 14 c of the diaphragm rubber 14 is in contact with a main valve seat 27 formed in the main valve structure 17.

An input port 23 is formed on the left side of the main valve structure 17, and an output port 25 is formed on the right side. The diaphragm rubber 14 blocks or connects the input port 23 and the output port 25 by contacting or separating from the main valve seat 27. A pilot valve hole 21 is formed in the center of the diaphragm center portion 13. At an upper end of the pilot valve hole 21, a pilot valve seat 13a is formed. In FIG. 1, the pilot valve seat 1 is shown.
3a, a pilot valve body 2 fixed to the movable iron core 16 is provided.
0 is in contact. The movable iron core 16 is slidably held in a hollow portion of a coil 18 around which a conductive wire is wound. The movable iron core 16 is urged by a return spring 19 in a direction in which the pilot valve body 20 comes into contact with the pilot valve seat 13a.

Next, the operation of the conventional pilot solenoid valve having the above configuration will be described. FIG. 1 shows a diaphragm valve element 1
2 is in contact with the main valve seat 27 and the input port 23 and the output port 25 are shut off. At this time, the coil 18 is not energized, the movable iron core 16 is urged downward by the return spring 19, and the pilot valve body 20 is in contact with the pilot valve seat 13a. Thus, the diaphragm back chamber 26 and the pilot valve hole 21 are shut off. The balance of forces in this state will be described. At the input port 23, a fluid having a predetermined pressure exists. Fluid can flow into the diaphragm back chamber 26 through the bleed hole 22, and the pressure of the fluid acts on the entire upper surface of the diaphragm valve body 12 and urges the diaphragm valve body 12 downward. On the other hand, the input port 23
The fluid acts on the peripheral portion of the diaphragm valve body 12 and urges the diaphragm valve body 12 upward. here,
The area where the fluid acts on the diaphragm valve body 12 is:
Since the upper surface is wide, the diaphragm valve body 12 is urged downward, and the diaphragm valve body 12 comes into contact with the main valve seat 27.

FIG. 2 shows a state in which the coil 18 is energized. The movable iron core 16 is upwardly attracted by the magnetic field generated by the coil 18, and the attractive force overcomes the spring force of the return spring 19, and the movable iron core 16 moves upward,
The pilot valve element 20 is separated from the pilot valve seat 13a. As a result, the fluid in the diaphragm back chamber 26 flows to the output port 25 via the pilot valve hole 21, and the pressure of the fluid in the diaphragm back chamber 26 decreases. Bleed hole 2
2 is smaller than the area of the pilot valve hole 21, and the amount of fluid flowing from the diaphragm back chamber 26 to the output port 25 is smaller than the amount of fluid added from the input port 23 to the diaphragm back chamber 26. Because there are many.

[0019] The present embodiment pilot solenoid valve 11 is intended to be used with warm water washing flight seat, a pressure regulator (not shown) before the input port is connected, the pressure of water flowing into the input port Is 0.1K in diaphragm valve differential pressure
g / cm ² . The inventors of the present invention conducted research on preventing abnormal noise generated in a pilot type solenoid valve used at a diaphragm valve differential pressure of about 0.1 kg / cm ² ,
It was confirmed that the use of fluorine rubber instead of the ethylene propylene terpolymer rubber conventionally used as the diaphragm rubber 14 prevents generation of abnormal noise. Further, even when the conventional ethylene propylene terpolymer rubber is used, the displacement portion 1 of the diaphragm rubber
It was confirmed that when the thickness of 4b was made thinner than 0.45 mm conventionally used and 0.4 mm or less, no abnormal noise was generated.

Further, by examining the cause of the generation of abnormal noise, even when rubber or an elastic body other than ethylene propylene terpolymer rubber or fluorine rubber is used as the material of the diaphragm rubber 14, if the diaphragm drag is set to 90 g or less, It was estimated that no abnormal noise would occur. Here, the diaphragm drag is defined. FIG.
As shown in (2), the holding portion 14a of the diaphragm rubber 14 is vertically sandwiched and fixed, and the position of the diaphragm center portion 13 in a no-load state is measured. Next, as shown in FIG. 4, a drag F is applied to the central lower surface of the diaphragm center portion 13. The stroke at which the diaphragm center 13 changes when the drag F is applied is measured. Then, the magnitude of the drag F when the displacement stroke becomes 0.5 mm is defined as a diaphragm drag.

[0021]

[Table 1] According to the experiment, as shown in Table 1 and FIG. 5, when the diaphragm drag was 90 g or less, it was confirmed that no abnormal noise was generated when the diaphragm valve element 12 was opened and closed. And, as a condition to make the diaphragm drag 90 g or less,
If the material of the diaphragm rubber 14 is fluoro rubber, the thickness of the displacement portion 14b may be 0.45 mm or less, and if the material of the diaphragm rubber 14 is ethylene propylene terpolymer rubber, the thickness of the displacement portion 14b is 0.4 mm.
It has been confirmed that the following should be performed. FIG. 5 shows the relationship between the drag F and the stroke obtained by the experiment described with reference to FIG.

[0022]

[Table 2] According to the experiment, as shown in Table 2 and FIG. 6, even in a region where the diaphragm valve differential pressure is small, a large flow rate can be stably obtained as compared with the related art. That is, the conventional 0.45 mm thick EPT diaphragm valve shown by the solid line and the 0.3 mm thick EPT diaphragm of the present invention shown by the dotted line.
In comparison with the PT diaphragm valve, for example, the diaphragm valve differential pressure used in the present embodiment is 0.1 kg / cm ^2.
In a conventional 0.45 mm EPT diaphragm valve,
1.87 l / min, compared to 0.3
It can be seen that a flow rate of 4.6 liters / minute, which is almost three times as large, can be obtained with an EPT diaphragm valve of mm. This indicates that the responsiveness of the diaphragm valve is high in a region where the diaphragm valve differential pressure is low.

In this embodiment, fluorine rubber is used as the diaphragm rubber 14, and the thickness of the displacement portion 14b is set to 0.45.
mm, the diaphragm drag is 90 g. Therefore, even if the pressure of the water flowing into the input port 23 is as low as 0.1 kg / cm ^{2 as the} diaphragm valve differential pressure, the pilot valve 20
a, the diaphragm back chamber 26 and the output port 2
When the diaphragm 5 is communicated, the displacement portion 14b can move smoothly as a whole, so that the diaphragm valve body 12 does not tilt, and the local ejection of water due to the inclination of the diaphragm valve body 12 is also prevented. Therefore, it is possible to prevent the generation of abnormal noise caused by the local ejection of water. In this embodiment, the case where the fluorine rubber is used as the diaphragm rubber 14 has been described, but the ethylene rubber propylene polymer is used as the diaphragm rubber 14 and the displacement portion 14 is used.
Even if the thickness of b is 0.4 mm or less, the same effect can be obtained because the diaphragm drag can be 90 g or less.

When the pressure of the fluid in the diaphragm back chamber 26 decreases, the force acting upward on the diaphragm valve body 12 becomes greater than the force acting downward, and the diaphragm valve body 12 moves upward. Then, the diaphragm valve element 12 is separated from the main valve seat 27. Thereby, the input port 23 and the output port 25 are communicated, and the fluid flows from the input port 23 to the output port 25.

As described in detail above, according to the pilot type solenoid valve 11 of the present embodiment, the diaphragm valve element 12
The magnitude of the drag F when the center position of the diaphragm valve body 12 changes by 0.5 mm is defined as the diaphragm drag when the load is in a no-load state and when the upward drag F is applied to the center of the diaphragm valve. Since the diaphragm drag is set to 90 g or less, even when the pressure of the fluid supplied to the input port 23 is low, the diaphragm valve body 12 can be smoothly translated without causing inclination. In addition, it is possible to eliminate the spouting of water and prevent generation of abnormal noise.

The above embodiment does not limit the present invention, and various modifications and improvements can be made without departing from the spirit of the present invention. For example, in the present embodiment, the case where the ethylene propylene terpolymer rubber and the fluorine rubber are used as the elastic body has been described, but even if other rubbers or other elastic bodies are used,
The same effect can be obtained by setting the diaphragm drag to 90 g or less. Further, in the present embodiment, the diaphragm center portion 13 and the diaphragm rubber 14 are made of different materials, but the same applies to a case where the whole is formed as an elastic body.

[0027]

As is apparent from the above description, in the pilot type solenoid valve of the present invention, when the diaphragm valve element is in a no-load state and when an upward drag is applied to the center of the diaphragm valve, The center position of the diaphragm valve is 0.5
When the pressure of the fluid supplied to the input port is low, the diaphragm valve body is smooth without tilting even if the pressure of the fluid supplied to the input port is low because the magnitude of the reaction force when the change in mm is the diaphragm reaction force is set to the diaphragm resistance. Can be moved in parallel to eliminate water spouts,
Generation of abnormal noise can be prevented.

[Brief description of the drawings]

FIG. 1 is a pilot type solenoid valve 1 according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing the configuration of FIG.

FIG. 2 is a cross-sectional view showing a state when a coil of the pilot-type solenoid valve 11 shown in FIG. 1 is energized.

FIG. 3 is a sectional view showing the structure of the diaphragm valve element 12;

FIG. 4 is an explanatory diagram showing a method of measuring a diaphragm drag.

FIG. 5 is a data diagram showing a relationship between a drag F applied to a diaphragm and a stroke.

FIG. 6

FIG. 7 is a sectional view showing a configuration of a conventional pilot type solenoid valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Pilot type solenoid valve 12 Diaphragm valve body 13 Diaphragm center part 13a Pilot valve seat 14 Diaphragm rubber 14a Retaining part 14b Displacement part 14c Lower surface part 16 Movable iron core 18 Coil 20 Pilot valve body 21 Pilot valve hole 22 Bleed hole 23 Input port 25 Output Port 26 Diaphragm back chamber 27 Main valve seat

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-63062 (JP, A) JP-A-3-255278 (JP, A) JP-A-3-84482 (JP, U) JP-A-4-84 32365 (JP, U)

Claims (3)

(57) [Claims] 1. A diaphragm valve for opening and closing a main valve hole, a bleed hole formed in the diaphragm valve for communicating a diaphragm back chamber with an input port of the main valve hole, a diaphragm back chamber formed in the diaphragm valve and a main valve hole. a pilot valve bore for communicating the output port, have a movable iron core for opening and closing the pilot valve hole, the pressure difference 0.1 Kg / cm in bidet
Warm water used at about ² and flow rate of about 1 liter / min
In the cleaning flights seat for pilot solenoid valve, and when the diaphragm valve in unloaded condition, between the time obtained by adding the center upward drag of the diaphragm valve, the center position of the diaphragm valve is 0.5mm changed the magnitude of the drag when the diaphragm drag, hot water, characterized in that the said diaphragm drag below 90 grams
Pilot operated solenoid valve for flush toilet seat . 2. The pilot-operated solenoid valve for a hot water flush toilet seat according to claim 1, wherein the diaphragm valve comprises a rigid body constituting a central portion, and an elastic body connected to a periphery of the rigid body. A pilot-type solenoid valve for a warm water flush toilet seat , wherein the elastic body is fluorine rubber, and a thickness of an elastic body displacement portion for moving the diaphragm valve is 0.45 mm or less. 3. The pilot-operated solenoid valve for a warm water flush toilet seat according to claim 1, wherein the diaphragm valve comprises a rigid body constituting a central portion, and an elastic body connected around the rigid body. Rutotomoni, the elastic body is an ethylene-propylene terpolymer rubber, hot water washed the thickness of the elastic body displacement unit for moving the diaphragm valve is characterized in that it is 0.4mm or less
Pilot operated solenoid valve for toilet seat .