JP2860466B2 - Rubber valve seat for flow control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber valve seat for a flow control valve which is integrally attached to an end of a flow control valve driven by a driving device and controls opening and closing of a valve seat. Such a flow control valve element is used, for example, in a solenoid valve as a movable core driven by an electromagnetic device, and a rubber valve seat is formed integrally with an end of the movable core to form a flow path in the solenoid valve. A valve seat, which is divided into a primary flow path and a secondary flow path, is controlled to open and close by a rubber valve seat according to the movement of the movable core.

[0002]

2. Description of the Related Art A rubber valve seat in a conventional flow control valve will be described with reference to FIG. In this example, a flow control valve element used in a solenoid valve is shown. Reference numeral 1 denotes a coil bobbin around which a coil 2 is wound. The coil bobbin 1 is disposed on the valve body 3 via a donut-shaped magnetic pole piece 5 and has a bottomed cylindrical housing 4 around the coil bobbin 1. Is disposed, and the open end of the housing 4 is caulked and fixed to the valve body 3. Reference numeral 6 denotes a fixed core disposed above the coil bobbin 1 and fixed to the upper bottom of the housing 4. Reference numeral 7 denotes a flow rate disposed opposite to the fixed core 6 and movably disposed in the coil bobbin 1. A movable core as the control valve element 8. In addition, 9
Is a spring that is contracted between the fixed core 6 and the flow control valve element 8 and that applies a force for separating the flow control valve element 8 from the fixed core 6. Reference numeral 10 denotes a valve seat that divides a flow passage formed in the valve main body 3 into a primary flow passage 11 and a secondary flow passage 12. Opening / closing is controlled by a rubber valve seat formed at the end.

[0003] The rubber valve seat S comprises the following. The rubber valve seat S is formed integrally with a valve seat attachment end face 8A which is a flat end face on the side facing the valve seat 10 of the flow control valve body 8. In FIG. 4, the valve seat attachment end face 8A is formed on the upper end face of the flow control valve body 8. The valve seat S is formed of a rubber material and has a flat portion S1 formed along the valve seat attachment end face, and an annular seat portion S2 protruding from the outer peripheral portion of the flat portion S1 toward the valve seat 10 side. The valve seat S is integrally attached to the valve seat attachment end face 8A of the flow control valve body 8. The valve seat S moves synchronously with the flow rate control valve element 8. When the annular seat portion S <b> 2 of the valve seat S comes into contact with the valve seat 10, the valve seat S closes a flow path opened in the valve seat 10, and the primary Side channel 11 and secondary side channel 1
2 and shut off.

[0004]

The rubber valve seat in such a conventional flow control valve body is formed as follows. That is, a mold having a cavity composed of a concave portion corresponding to the shape of the flat plate portion S1 and the annular seat portion S2 is brought into contact with the valve seat attachment end surface 8A, and the rubber is discharged from the gate hole opened in the center of the cavity. After the rubber is injected and solidified in the cavity, the flow control valve body 8
The mold is separated more. According to the above, the flow control valve element 8
A rubber valve seat S composed of a flat plate portion S1 and an annular seat portion S2 is integrally attached to the valve seat attachment end surface 8A.

According to the above-described mold, rubber is injected into the cavity. As shown in FIG. 4, the rubber flowing into the cavity from the central gate hole is attached to the valve seat having a flat surface. After colliding with the end face 8A,
Flowing outward in the circumferential direction along the valve seat attachment end surface 8A, the flow A of the first rubber flows diagonally upward rightward along the inner slope of the annular seat portion S2,
The flow B of the second rubber flows diagonally upward and to the left along the outer slope of the annular sheet portion S2.

According to the above description, in the annular sheet portion S2, the first rubber flow A and the second rubber flow B collide near the vertex of the annular sheet portion S2.
According to this, a weld line may be generated near the vertex of the annular sheet portion S2.

On the other hand, when the rubber valve seat S comes into contact with the valve seat 10, the annular seat portion S2 of the rubber valve seat S
The valve seat 10 is provided to increase the surface pressure of the contact portion, and the closing of the valve seat 10 is mainly performed by the annular seat portion S2.

Here, as described above, when a weld line is generated near the top of the annular seat portion S2, the closing function of the valve seat 10 may be impaired.

In view of the above, the weld line generated in the rubber valve seat S, particularly near the apex of the annular seat portion S2, must be completely removed.
Therefore, in the related art, the rubber valve sheet S is enlarged and inspected over the entire number, and the rubber valve sheet S having no weld line is selectively used.

[0010] According to the inspection of the entire number, the number of inspection steps is required, which leads to an increase in manufacturing cost, which is not preferable. Further, there is a problem that the production efficiency cannot be improved. Was.

The rubber valve seat in the flow control valve body according to the present invention has been made in view of such a problem, and suppresses the occurrence of weld lines, particularly in the annular seat portion, when the rubber valve seat is formed on the flow control valve body. It is an object of the present invention to reduce the manufacturing cost of rubber valve seats and improve production efficiency.

[0012]

In order to achieve the above object, a rubber valve seat in a flow control valve body according to the present invention has a valve seat mounting end face opposed to a valve seat of the flow control valve body driven by a driving device. In a rubber valve seat in a flow control valve body, a flat plate portion and a valve seat having an annular seat portion protruding toward the valve seat side from the outer peripheral portion of the flat plate portion are integrally formed by injection molding. The first point is that a conical recess extending from the center of the flow control valve body toward the annular seat portion is provided on the valve seat attachment end surface of the flow control valve body.
The feature of.

Further, the present invention provides a flat plate portion and an outer peripheral portion of the flat plate portion on the valve seat mounting end face facing the valve seat of the flow rate control valve element driven by the driving device. A valve seat having a protruding annular seat portion is formed by injection molding. In a rubber valve seat of a flow control valve body integrally formed, an annular seat portion faces a valve seat attachment end face of the flow control valve body, and faces the annular seat portion. A second feature is that an annular projection having a shape substantially similar to the cross section of the portion is provided.

According to a first feature of the present invention, the rubber entering the cavity from the central gate of the mold collides with the conical concave portion and flows obliquely toward the annular sheet portion. The flow of the first rubber flows obliquely downward and rightward toward the outside of the annular seat through the vertex of the annular seat, and the flow of the second rubber flows inward along the end face of the valve seat. The air flows horizontally outward in the circumferential direction, reaches the outer portion of the annular sheet portion, and the flows of both rubbers collide mainly on the outer portion of the annular sheet portion.

According to a second feature of the present invention, the rubber that enters the cavity from the central gate of the mold collides with the valve seat mounting end face and then circumferentially moves along the valve seat mounting end face. Flows outwards horizontally. On the other hand, the flow of the rubber entering the annular sheet portion is controlled by the annular protrusion along with the flow of the rubber along the annular sheet portion, and the rubber flow swirls and collide mainly at the outer portion of the annular sheet portion.

[0016]

FIG. 1 shows a first embodiment of a rubber valve seat in a flow control valve according to the present invention. In addition, only the difference between the conventional device and the flow control valve element and the rubber valve seat will be described. A conical recess 20B is formed in the valve seat mounting end face 20A of the flow control valve body 20 on the side facing the valve seat 10. The conical recess 20 </ b> B is formed in a conical shape that is deepest at the center 20 </ b> C of the flow control valve body 20, and the depth thereof gradually decreases toward the outer periphery of the flow control valve body 20. The outer peripheral end 20D of the conical concave portion 20B is formed facing the annular seat portion S2, but the outer peripheral end 20D is preferably located near the inner slope S3 of the annular seat portion S2. Specifically, the position of the outer peripheral end 20D is determined by injecting rubber into the cavity and considering the occurrence of a weld line.

The rubber valve seat S is formed by a flat portion S1 formed at the center portion and an annular seat portion S2 formed at the outer periphery of the flat portion S1. A cavity corresponding to the portion S1 and the annular seat portion S2 is formed, a mold having the cavity is disposed in contact with the valve seat attachment end surface 20A of the flow control valve body 20, and a gate hole provided in the center is provided. Thus, rubber is injected into the cavity.

The rubber injected into the cavity from the gate hole is filled with the central portion 20C of the conical concave portion 20B formed in the valve seat mounting end surface 20A of the flow control valve body 20.
And collides with the deepest part of the conical recess 20B. In FIG. 1, the rubber is moved from the central portion 20C of the conical concave portion 20B to the outer peripheral end 20 of the conical concave portion 20B.
It flows obliquely upward in the circumferential direction toward D. Then, the flow A of the first rubber flowing into the cavity corresponding to the annular sheet portion S2 is formed on the inner slope S3 of the annular sheet portion S2.
Flows obliquely upward, along the vertex S5 of the annular seat portion S2, diagonally downward along the outer slope S4 of the annular seat portion S2, and reaches near the outer end S6 of the annular seat portion S2.

On the other hand, the flow B of the second rubber flowing into the cavity corresponding to the annular seat portion S2 flows horizontally outward along the flat-shaped valve seat attachment end surface 20A. It reaches near the outer end S6 of the annular seat portion S2.

In the cavity corresponding to the outer end S6 of the annular sheet portion S2, the first rubber flow A and the second rubber flow B collide with each other. The rubber is solidified, so that the flat portion S1
A rubber valve seat S having an annular seat portion S2 is integrally formed on a valve seat attachment end surface 20A of the flow control valve body 20.

According to the first embodiment, since the conical concave portion 20B is provided on the valve seat mounting end surface 20A, the rubber flowing from the conical concave portion 20B into the cavity corresponding to the annular seat portion S2. The flow of the first rubber mainly from the inner slope S3 of the annular seat portion S2 to the outer end S6 of the annular seat portion S2 through the outer slope S4, and the annular seat along the valve seat attachment end surface 20A. Directivity is given to the flow of the second rubber toward the outer end S6 of the portion S2, and the flows of the rubber collide near the outer end S6 of the annular sheet portion S2.

According to the above description, it is possible to avoid collision of the rubber flow particularly near the vertex S5 of the annular seat portion S2, and particularly at the vertex S5 of the annular seat portion S2 which greatly affects the closing action of the valve seat. Welding was effectively suppressed. Accordingly, the step of checking and checking the occurrence of weld at the vertex S5 can be eliminated, thereby reducing the manufacturing cost and improving the production efficiency of the rubber valve seat. It should be noted that even if a weld occurs at the outer end S6 of the annular seat portion S2, there is no problem because the valve seat 10 is closed at the top of the annular seat portion S2.

The rubber valve seat S is fixed to the valve seat mounting end face 20A by baking the rubber to be melted. Is increased, so that the adhesive strength of the rubber valve sheet S can be increased.

Next, a second embodiment of the rubber valve seat in the flow control valve element according to the present invention will be described with reference to FIG. Valve seat attachment end surface 30 of flow control valve body 30
A is formed in a flat shape, and the valve seat attachment end face 30A
A small annular protrusion 30B having a shape similar to the cross section of the annular sheet portion S2 is formed to protrude above. That is,
The annular projection 30B has an inner slope S3 of the annular seat portion S2.
An inner slope 30C having a similar shape to that of the annular seat portion S2 is formed, and an outer slope 30D having a similar shape to the outer slope S4 of the annular seat portion S2 is formed. And in the mold not shown,
Cavities corresponding to the flat plate portion S1 and the annular seat portion S2 are formed, and the cavities are arranged in contact with the valve seat attachment end surface 30A. Then, the rubber injected into the cavity from the gate of the mold flows toward the center of the valve seat attachment end surface 30A and collides with the valve seat attachment end surface 30A. Then, the rubber flows toward the outside of the circumference of the flat end surface 30A of the valve seat attachment. The flow A of the rubber flowing into the cavity corresponding to the annular sheet S2 first flows obliquely upward along the inner slope 30C of the annular protrusion 30B, passes through the vertex S5, and then flows outside the annular protrusion 30B. It flows obliquely downward along the slope 30D, and the outer end S of the annular seat portion S2
Reach 6.

In this state, the rubber solidifies as time passes, so that the rubber valve seat S having the flat plate portion S1 and the annular seat portion S2 is moved to the flow control valve body 30.
Are formed integrally on the valve seat attachment end surface 30A.

According to the above, the collision of the rubber flow particularly near the apex S5 of the annular seat portion S can be avoided, and the occurrence of the weld at the apex S5 can be suppressed. Can be improved.

Further, the provision of the annular projection 30B on the valve seat attachment end surface 30A increases the bonding area between the rubber valve seat S and the valve seat attachment end surface 30A. End surface 30
The adhesive strength to A can be increased. Furthermore, by making the annular projection 30B substantially similar in cross section to the annular sheet portion S2, the thickness of the annular sheet portion S2 can be made substantially uniform. When formed, the distortion of the annular seat portion S2 can be eliminated, which is effective in improving the closeability of the valve seat 10.

The flow control valve is not limited to the one used for the solenoid valve, but is widely used as a rubber valve seat of a valve for controlling a fluid.

[0029]

As described above, according to the rubber valve seat in the flow control valve body according to the present invention, the collision portion of the rubber flow is formed by the conical recess or the annular projection provided on the end face where the valve seat is attached. Since it was possible to collect at the outer end, the occurrence of weld at the top of the annular seat portion closing the valve seat could be suppressed. Therefore, the manufacturing cost of the flow control valve body having the rubber valve seat can be reduced, and the production efficiency can be improved. In addition, the provision of the conical concave portion or the annular protrusion on the valve seat attachment end surface can increase the adhesive strength of the rubber valve seat to the valve seat attachment end surface.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing one embodiment of a rubber valve seat in a flow control valve body of the present invention.

FIG. 2 is a longitudinal sectional view of a main part showing another embodiment of a rubber valve seat in the flow control valve body of the present invention.

FIG. 3 is a longitudinal sectional view of a solenoid valve using a conventional flow control valve element.

FIG. 4 is a longitudinal sectional view of a main part of a rubber valve seat in the flow control valve body used in FIG. 3;

[Explanation of symbols]

 20, 30 Flow control valve body 20A, 30A Valve seat attachment end face S Rubber valve seat 20B Conical recess 30B Annular protrusion S2 Annular seat

Claims (2)

(57) [Claims] 1. A flat portion, and an annular seat protruding from the outer peripheral portion of the flat portion toward the valve seat at an end face of the valve seat opposite to a valve seat of the flow control valve body driven by the driving device. In the rubber valve seat of the flow control valve body which is integrally formed by injection molding, the valve seat having the valve seat end face 2 of the flow control valve body 20 is provided.
0A, from the center of the flow control valve body 20 to the annular seat portion S2.
A rubber valve seat in a flow control valve body, characterized in that a conical recess 20 </ b> B is provided. 2. A flat plate portion, and an annular seat protruding from the outer peripheral portion of the flat plate portion toward the valve seat at an end face of the valve seat facing the valve seat of the flow control valve body driven by the driving device. The valve seat having the valve seat is formed by injection molding, and the rubber valve seat of the flow control valve body is integrally formed.
A rubber valve seat in a flow control valve body, wherein an annular projection 30B facing the annular seat portion S2 and having a shape substantially similar to the cross section of the annular seat portion S2 is provided at 0A.