JP2000104838A - Seal structure of solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the seal structure of a solenoid valve improved in its seal property. SOLUTION: The seal structure of a solenoid valve has a diaphragm valve body 20 interlocking the movement of a movable magnetic core 4 moving by the electrification to a solenoid 1 and a spring receiver 23 interposed between the diaphragm valve body and spring member 22. The diaphragm valve body 20 is contacted to a valve seat 15 by the spring receiver 23 received the energizing force of the spring member 22. A spherical surface whose center stays on the axial center common to the movable magnetic core 4 and the diaphragm valve bodies 19,20 is formed on the contact surface contacting to the spring receiver 23 of a projection part 20a formed on the center part of the diaphragm valve body 20 or the contact surface of the spring receiver 23 or the contact surface of the projection part 20a and the contact surface of the spring receiver 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve seal structure for improving the sealing performance of a diaphragm type valve element which comes into contact with a valve seat by receiving a biasing force of a spring.

[0002]

2. Description of the Related Art Conventionally, various solenoid valves using a diaphragm valve element have been used. Therefore, a three-port solenoid valve having a diaphragm valve body is shown as an example, and the solenoid valve seal structure will be described. FIG. 6 is a sectional view of a solenoid valve showing a conventional solenoid valve. The solenoid valve according to the conventional example includes a solenoid unit that controls opening and closing of the valve and a valve unit. A fixed iron core 52 is fixedly mounted above the inside of the cylindrical coil 51 in the solenoid portion, and a movable iron core 54 urged by a spring 53 is fitted below the fixed iron core 52.

[0003] On the other hand, the valve portion is formed in a body 61 fixed to the lower end of the solenoid portion. A through hole 62 penetrating vertically is formed in the center of the body 61 coaxially with the movable iron core 54, and a valve rod 63 is fitted therein. The body 61 has an input port 64 communicating with an intermediate position of the through hole 62, a normally closed port 65 communicating with an opening of the through hole 62 on the solenoid side, and a through hole 62.
And a normally open port 66 communicating with the other end of the opening. At both ends of a valve rod 63 fitted in the through hole 62, a first diaphragm valve element 6 for shutting off between the ports is provided.
7 and the second diaphragm valve element 68 are fixed. The urging force of the spring 70 fitted between the second diaphragm valve body 68 and the cover 69 is applied to the second diaphragm valve body 68.
Joining through one.

In the conventional solenoid valve having such a configuration, the exciting force generated by energizing the coil 51 attracts the movable iron core 54 against the urging force of the spring 53. Therefore, at the time of energization, the valve rod 63 is released by the movable iron core 54 that has been raised, and is raised by the urging force of the spring 70. Therefore, when power is not supplied, the first diaphragm valve body 67 pressed by the movable core 54 abuts on the first valve seat 72 at the solenoid-side opening of the through hole 62, and the input port 64 communicates with the normally open port 66. . On the other hand, at the time of energization, the movable core 54 is attracted to the fixed core 53, so that the second diaphragm valve body 68 receiving the urging force of the spring 70 moves the second valve seat 7 at the lower end opening of the through hole 62.
3, the input port 64 communicates with the normally closed port 65.

[0005]

However, the conventional solenoid valve having such a structure, in particular, the second diaphragm valve body 68 and the spring receiver 7 which receive the urging force of the spring 72.
In the electromagnetic valve seal structure composed of No. 1, there is a problem that the sealing performance of the second diaphragm valve body abutting on the second valve seat becomes unstable. That is, the second diaphragm valve body 68 is formed by forming a disc-shaped valve body having a flat end surface at the center of the diaphragm, while the second diaphragm valve body 68 is formed.
The contact surface of the spring receiver 71 which is interposed between the spring 72 and the valve body is also formed to be flat. Such a structure is also seen on the first diaphragm valve body 67 side, and the end face of the movable core 54 abutting on the flat surface is formed in a flat shape with respect to the valve body having a cylindrical end surface. ing.

[0006] Therefore, since the contact area is large between planes, a high flatness is required in order to apply a uniform load by transmitting a stable urging force. If the required flatness cannot be obtained, the urging force of the spring 72 is applied to the first diaphragm valve body 68 in a biased manner, so that a uniform load cannot be obtained on the sealing surface, causing a variation. on the other hand,
In the case where the second diaphragm valve body 68 is airtightly abutted against the second valve seat 73 to obtain a high sealing property, this can be achieved by changing the spring 70 to one that applies a large load. On the other hand, the other spring 53 also needs to be enlarged, and the solenoid also needs to be increased in size to attract the movable iron core 51 against the urging force of the spring 53. There was a disadvantage that it would.

Accordingly, an object of the present invention is to provide a solenoid valve seal structure in which the sealing property is improved in order to solve such a problem.

[0008]

According to the present invention, there is provided a solenoid valve seal structure comprising: a diaphragm valve body interlocked with a movement of a movable iron core which is moved by energizing a solenoid; and a valve seat formed with respect to the diaphragm valve body. A spring member for urging the diaphragm valve body against the valve seat, and a spring receiver interposed between the diaphragm valve body and the spring member, wherein the spring member receives the urging force of the spring member. An abutting surface for abutting the spring receiver on a convex portion formed at a center portion of the diaphragm valve body, wherein the diaphragm valve body abuts on the valve seat via a spring receiver; A spherical surface having a center on a common axis, such as the movable iron core or the diaphragm valve body, is formed on the contact surface, or the convex contact surface and the spring receiving contact surface.

In the solenoid valve seal structure of the present invention having such a configuration, the diaphragm valve body biased by the spring member in accordance with the movement of the movable core abuts against the valve seat to close the valve. The convex part of the diaphragm valve element and the spring receiver interposed between the diaphragm valve element and the spring member have a convex part abutting surface, a spring receiving abutting surface, or a convex part abutting surface and a spring receiving abutting surface. The spherical valve formed on the diaphragm always contacts on the axial center, so that the diaphragm valve element contacts the valve seat evenly, thereby improving the sealing performance.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a solenoid valve seal structure according to the present invention will be described with reference to the drawings. 1 and 2 are cross-sectional views showing a solenoid valve having the solenoid valve seal structure of the first embodiment. FIG. 1 shows a state when power is not supplied, and FIG. 2 shows a state when power is supplied. Indicated. The solenoid valve in the present embodiment is also a three-port solenoid valve like the above-mentioned conventional example, and has the following configuration. The solenoid valve according to the present embodiment includes a solenoid for controlling the opening and closing of the valve and a valve for controlling the flow of fluid. A fixed core 2 occupying the upper half of the inside of the cylindrical coil 1 is fixed to the solenoid part, and a movable core 4 urged by a spring 3 is inserted into the lower half thereof and penetrates the support frame 5. It is configured to slide. The movable iron core 4 has a columnar shape, and has a concave portion in which the spring 3 is fitted at the upper end and a concave portion in which a diaphragm valve element described later is fitted at the lower end.

On the other hand, the valve section is formed in a body 11 fixed to the lower end of the solenoid section. A through hole 12 penetrating vertically is formed in the center of the body 11 coaxially with the movable iron core 4, and a valve rod 13 is fitted therein. A first valve seat 14 is provided on both sides of the through hole 12 on the solenoid side.
However, a second valve seat 15 is formed on the opposite side. The body 11 has an input port 16 communicating with an intermediate position of the through hole 12, a normally closed port 17 communicating with an opening of the through hole 12 on the solenoid side, and a through hole 12.
Normally open port 18 communicating with the other end side opening
Are formed. Valve stem 13 inserted in through hole 12
A first diaphragm valve element 19 for the first valve seat 14 and a second diaphragm valve element 20 for the second valve seat 15 are fixed to the end of the first valve seat 14. A spring 22 is fitted between the second diaphragm valve body 20 and the cover 21, and a spring receiver 23 is interposed between the spring 22 and the second diaphragm valve body 20.

By the way, the first and second diaphragm valve bodies 19 and 20 constituting the solenoid valve of the present embodiment have cylindrical projections 19a and 20 at the center of the diaphragm.
a is formed so as to protrude on the opposite side of the valve seats 14 and 15, and a spherical surface having a center on an axis common to the movable iron core 4 and the valve rod 13 is formed on the end faces of the projections 19a and 20a. I have. Further, the spring receiver 23 is provided with the second diaphragm valve body 2.
It has a concave shape into which the 0 convex portion 20a enters, and a spherical surface is also formed on the bottom surface, and the center of the spherical surface is disposed so as to be located on a common axis with the valve rod 13 and the like. A projecting portion with which the spring 22 abuts is formed in a circumferential shape at the end. Therefore, the second diaphragm valve element 2
The end surface of the convex portion 20a of the zero and the bottom surface of the spring receiver 23 are arranged such that the spherical surfaces abut against each other, and their central portions coincide on the axis. Such first and second diaphragm valve elements 1
9 and 20 are formed of PTFE (polytetrafluoroethylene), and the spring receiver 23 is formed of metal or resin.

The solenoid valve having such a configuration and the solenoid valve seal structure operate as follows. When the coil 1 is energized from the state shown in FIG. 1, the exciting force generated in the fixed core 2 attracts the movable core 4 to the fixed core 2 side against the biasing force of the spring 3 as shown in FIG. Therefore, at the time of energization, the valve rod 13 is released from the raised movable core 4 and rises by the urging force of the spring 22. Accordingly, when the first diaphragm valve element 19 at the upper end of the valve rod 13 is released from the pressing of the movable core 4, the first diaphragm valve element 19 is separated from the first valve seat 14, while the second diaphragm at the lower end of the valve rod 13 is provided. The valve body 20 is brought into contact with the second valve seat 15 by the urging force of the spring 22. Therefore, the flow path between the input port 16 and the normally open port 18 is blocked, and the flow path between the input port 16 and the normally closed port 17 communicates.

On the other hand, when the power supply to the coil 1 is cut off,
A series of movable iron cores 4 and valve rods 13 arranged coaxially include:
It is urged downward by the spring 3 against the urging force of the spring 22 acting upward. Therefore, at the time of non-energization, the first biased by the spring 3 via the movable iron core 4
While the diaphragm valve element 19 contacts the first valve seat 14,
The second diaphragm valve element 20 is separated from the second valve seat 15. Therefore, the flow path between the input port 16 and the normally closed port 17 is shut off, and the flow path between the input port 16 and the normally open port 18 communicates.

In the solenoid valve in which the valve is opened and closed, the center of the spherical surface of the spring receiver 23 and the spherical surface of the convex portion 20a of the second diaphragm valve body 20 is one axial center. Accordingly, the urging force of the spring 22 is applied to the second diaphragm valve body 20 via the spring receiver 23. Therefore, the second diaphragm valve body 20 comes into contact with the second valve seat 15 while maintaining the equilibrium state. Here, Table 1 shows the experimental results of the sealing performance of the present embodiment having such a solenoid valve sealing structure and the above-mentioned conventional one. In the experiment, when the air pressure flowing from the input port 16 was gradually increased, the pressure value at the time when the leak occurred was examined. Table 1 shows the maximum value, the minimum value, and the average value.

[0016]

[Table 1]

Therefore, from the experimental results shown in Table 1, the average value of the sealing pressure at which the leakage occurred was increased from 1.78 kg / cm 2 to 3.4 kg / cm 2, and the sealing performance was improved about twice and the variation was increased. Is about two-thirds or less, indicating that the sealing performance capable of coping with high air pressure has been remarkably improved. That is, the electromagnetic valve seal structure of the present embodiment forms a spherical surface having a center on the axial center on the end surface of the convex portion 20a of the second diaphragm valve body 20, while forming the concave spring support 23.
Since the spherical surfaces are also formed on the bottom surface of each other, the respective spherical surfaces coincide with each other on the axial center, and the biasing force of the spring 22 works evenly without shifting with respect to the second diaphragm valve body 20.
The sealing performance when contacting the second valve seat 15 is improved.

Next, a second embodiment of the solenoid valve seal structure according to the present invention will be described with reference to the drawings. The solenoid valve seal structure of the present embodiment is used for the same solenoid valve as that of the first embodiment,
The diaphragm valve body is associated with the diaphragm valve body. FIG. 3 is a cross-sectional view showing the solenoid valve seal structure of the present embodiment.
Therefore, the configuration is such that the diaphragm valve element 32 fixed to the end of the valve rod 31 has a cylindrical convex portion 32 at the center thereof.
a is formed so as to protrude, and a conical positioning projection 32b is extended from the end face thereof. On the other hand, spring 3
3 and a spring receiver 34 interposed between the diaphragm valve elements 32
Is formed in a concave shape, and at the end thereof, a projecting portion abutting on the spring 33 is formed in a circumferential shape, and the positioning projection 32b of the diaphragm valve body 32 penetrates the bottom surface of the spring receiver 34. A positioning hole 34a is formed.

In the solenoid valve seal structure according to the present embodiment having such a configuration, when the upward restriction on the valve rod 31 is released, the diaphragm valve body 32 is moved by the urging force of the spring 33 to the valve seat (not shown). Abut. At that time, the spring receiver 3
The positioning protrusion 32b fits into the positioning hole 34a of No. 4, and the centers of the diaphragm valve body 32 and the spring receiver 34 are aligned on the axis. Therefore, also in the solenoid valve seal structure of the present embodiment, the urging force of the spring 33 is applied to the diaphragm valve body 3.
Since it works in a uniform state without displacement with respect to 2, the sealing performance when contacting a valve seat (not shown) is improved. In particular, since the positioning projection 32b of the diaphragm valve body 32 always penetrates through the positioning hole 34a of the spring receiver 34 to prevent the lateral displacement, the sealing performance is further improved.

Next, a third embodiment of the solenoid valve seal structure according to the present invention will be described with reference to the drawings. The electromagnetic valve seal structure of the present embodiment is also used for the same electromagnetic valve as that of the first embodiment.
The diaphragm valve body is associated with the diaphragm valve body. FIG. 4 is a cross-sectional view showing the solenoid valve seal structure of the present embodiment.
Therefore, the configuration is such that the diaphragm valve element 42 fixed to the end of the valve stem 41 has a cylindrical convex part 42 at the center thereof.
a is formed so as to protrude, and a cylindrical positioning hole 42b is formed in the end face. On the other hand, the spring 43
A spring receiver 44 interposed between the diaphragm valve body 42 and the diaphragm valve body 42 has a concave shape, and has an end formed with a projecting portion that abuts against the spring 43 in a circumferential shape, and further has a diaphragm valve body on its bottom surface. A conical positioning protrusion 44a that fits into the concave portion 42b of the 42 is formed.

In the solenoid valve seal structure according to the present embodiment having such a configuration, when the upward restriction of the valve rod 41 is released, the diaphragm valve body 42 is moved by the urging force of the spring 43 to the valve seat (not shown). Abut. At this time, the positioning protrusions 44b of the spring receiver 44 are fitted into the positioning holes 42b of the diaphragm valve body 42, and the centers of the diaphragm valve body 42 and the spring receiver 44 coincide on the axis. Therefore, also in the solenoid valve seal structure of the present embodiment, since the biasing force of the spring 43 works evenly without shifting to the diaphragm valve body 42, the sealing property when abutting on a valve seat (not shown) is obtained. Improvements were made. In particular, since the positioning protrusion 42b of the spring receiver 44 is always fitted into the positioning hole 42b of the diaphragm valve body 42 to prevent the lateral displacement, the sealing performance is further improved.

It should be noted that the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention. For example, in the first embodiment,
Although the case where a spherical surface is formed on the convex portion 20a of the second diaphragm valve body 20 is shown, a cover 26 made of a metal or a highly hard resin is provided on a diaphragm valve body 25 made of a fluororesin as shown in FIG. The cover 26 may have a spherical surface formed on the cover 26 in contact with the spring receiver 27.

For example, in the first embodiment,
Convex part 20a of second diaphragm valve element 20 and spring receiver 2
3 shows a case where spherical surfaces are formed on both of the bottom surfaces.
Like the relationship between the diaphragm valve element 19 and the movable iron core 4,
A spherical surface may be formed only on the convex portion 20a of the second diaphragm valve body 20, and the bottom surface of the spring receiver 23 may be a flat surface, or vice versa. According to this, the vertex of the spherical surface located on the axis with respect to the plane abuts, and the second diaphragm valve body always has a biasing force on the vertex regardless of poor finish of the plane or unstable spring bearing. In addition, the stability of the diaphragm valve body, that is, the sealing property is improved.
Also, for example, in the above-described embodiment, the electromagnetic valve seal structure used for the three-port electromagnetic valve has been described. However, any structure having a structure in which the spring receiver receives the urging force of the spring to urge the diaphragm valve body may be used. it can.

[0024]

According to the present invention, a contact surface which comes into contact with a spring receiver of a convex portion formed at the center of a diaphragm valve body, or a contact surface of the spring receiver, or a convex contact surface and a spring receiving contact. By forming a spherical surface having a center on a common axis, such as a movable iron core and a diaphragm valve body, on the contact surface, it has become possible to provide a solenoid valve seal structure with improved sealability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a solenoid valve having a first embodiment of a solenoid valve seal structure according to the present invention when power is not supplied.

FIG. 2 is a cross-sectional view of a solenoid valve having a solenoid valve seal structure according to a first embodiment of the present invention when energized.

FIG. 3 is a sectional view showing a second embodiment of the solenoid valve seal structure according to the present invention.

FIG. 4 is a sectional view showing a third embodiment of the solenoid valve seal structure according to the present invention.

FIG. 5 is a sectional view showing one embodiment of a solenoid valve seal structure according to the present invention.

FIG. 6 is a cross-sectional view of a solenoid valve having a conventional solenoid valve seal structure when energized.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 coil 2 fixed iron core 4 movable iron core 12 through hole 13 valve stem 15 second valve seat 16 input port 17 normally closed port 18 normally open port 20 second diaphragm valve element 20 a convex part 22 spring 23 spring receiver

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Katsuyoshi Nishi 2-7-2 Minamieki, Nakamura-ku, Nagoya-shi, Aichi Pref.

Claims (1)

[Claims] A diaphragm valve interlocking with a movement of a movable iron core that is moved by energizing a solenoid, a valve seat formed with respect to the diaphragm valve, and the diaphragm valve with respect to the valve seat. A biasing spring member, and a spring receiver interposed between the diaphragm valve body and the spring member, wherein the diaphragm valve body is connected to the valve seat via the spring receiver receiving the urging force of the spring member. In the electromagnetic valve seal structure to be brought into contact with, a contact surface that comes into contact with the spring receiver of a convex portion formed at the center of the diaphragm valve body, or a contact surface of the spring receiver, or a convex portion contact surface; A solenoid valve seal structure, wherein a spherical surface having a center on a common axis such as the movable iron core and the diaphragm valve body is formed on a spring receiving contact surface.