JPH09264431A - Poppet valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb a shock at the time of abutting between a sealing member and a valve seat, and to reduce the abrasion of a sealing member, and to stabilize sealing ability and to improve the durability of a poppet valve by giving the degree of freedom to the axial deflection of the valve stem of a poppet type sealing member. SOLUTION: A valve body 7 is provided with a valve seat 12 having a seal face 12a crossing the axial direction of a valve hole 11 at a right angle. A sealing member 21 is fittedly attached in the receiving groove 35 of a valve stem, and protrudes from the receiving groove 35 to form a seal face 21a which contacts and leaves in the axial direction of the valve hole 11 to the seal face 12a of the valve seat 12 in a protrusive part being larger in a diameter than the seal face 12a of the valve seat 12. Flexibility for deflection caused by pressure contact between the seal member 21 and the valve seat 12 is given to the protrusive part of the seal member 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a poppet valve that switches the direction of fluid flow.

[0002]

2. Description of the Related Art A valve rod is slidably inserted into a valve hole penetrating a valve body, and a valve seat between ports formed in the valve body is opened and closed by a poppet type seal member fitted to the valve rod. Then, the one in which the flow of the fluid between the ports is switched is conventionally known as disclosed in Japanese Patent Publication No. 48-13492. However, in the conventional poppet valve described above, the seal member is fitted or adhered in the housing groove of the valve rod without a gap, and when the seal member is in contact with the valve seat, the seal member is The pressure contact force acting between the valve seat and the valve seat has a radial component force around the axis of the seal member, and the seal member bends in the groove bottom direction of the storage groove. It only abuts against the seat, its free bending is blocked, and the wear due to the opening / closing operation of the seal member is severe, and therefore, the deterioration of the sealing performance, the operation failure, the deterioration of the durability, etc. are likely to occur. It is conceivable that the seal member may be damaged.

[0003]

SUMMARY OF THE INVENTION The technical object of the present invention is to provide a degree of freedom in the axial deflection of the valve rod of a poppet-type seal member so that the impact at the time of contact between the seal member and the valve seat can be achieved. Is absorbed to reduce the wear of the seal member, thereby stabilizing the sealing property between the seal member and the valve seat and improving the durability of the poppet valve.

[0004]

In order to solve the above problems, the poppet valve of the present invention has a valve body having a valve hole into which a valve rod is slidably inserted and a plurality of ports communicating with the valve hole. By driving the valve rod with a drive mechanism, the valve seat formed between the ports of the valve body is opened / closed by a poppet-shaped seal member provided on the valve rod to switch the flow of fluid between the ports. In the valve, the valve body is provided with a valve seat having a sealing surface that expands the diameter of the valve hole and is orthogonal to the axial direction of the valve hole, and the sealing member is formed by an elastic member. The axis of the valve hole with respect to the sealing surface of the valve seat is fitted to the protruding portion that is fitted into the housing groove provided around the valve rod and projects from the housing groove and has a diameter larger than the sealing surface of the valve seat. Forming a sealing surface that contacts and separates in the direction To the projecting portion in the outer peripheral portion, the seal member is characterized in that remembering flexible to flex to pressure contact with the valve seat.

In the above seal member, the valve seat is formed integrally with a part of the valve body, and the space formed between the storage groove and the inner surface of the valve hole around the storage groove is substantially equal to that of the seal member. Suitable for forming a volume of
It is suitable to adjust the flexibility of the protrusion by notching the upper edge of the protrusion opposite to the sealing surface with which the valve seat abuts in a substantially arc shape or an inclined surface shape.

In the poppet valve having the above structure, a sealing surface is formed on the projecting portion of the outer peripheral portion of the seal member, and the projecting portion is flexible because the seal member presses against the valve seat. Since the protrusion is elastically bent when the seal member and the valve seat are in contact with each other, the impact can be absorbed, and an appropriate valve closing force can be obtained by the bending. At the same time, the wear of the seal member can be reduced. In addition, of the above-mentioned protrusion
By notching the upper edge portion on the side opposite to the seal surface with which the valve seat abuts in a substantially arc shape, the pressure contact force at the time of abutting the seal member and the valve seat can be adjusted, and the impact due to the valve closing force Absorbency can be set appropriately.

As described above, it is possible to stabilize the sealing property between the seal member and the valve seat and to improve the durability of the seal member.

On the other hand, the valve body and the valve seat are integrally formed, and the space formed between the housing groove and the inner surface of the valve hole around the housing groove is formed to have a volume substantially equal to that of the seal member. As a result, the flexible bending of the seal member in the storage groove is ensured, and therefore, when assembling the poppet valve, it is only necessary to press fit the valve rod having the seal member fitted in the storage groove into the valve hole of the valve body. The assembly is easy and the number of parts is small, which is economically advantageous.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a poppet valve according to the present invention will be described in detail with reference to the drawings.
2 shows a first embodiment in which the present invention is applied to a direct-acting solenoid valve 1, which includes a valve portion 3 and an electromagnetic operating portion 5.

The valve body 7 of the valve portion 3 has a valve hole 11 into which the valve body 9 is slidably inserted, a supply port P for supplying a pressure fluid such as compressed air, which communicates with the valve hole 11, and an output port A. And a discharge port R are opened, and by enlarging the circumference of the valve hole 11 at the opening position of the output port A, both sides of the output port A are orthogonal to the axial direction of the valve hole 11. The valve seats 12, 12 having the sealing surface 12a are integrally formed. Then, one end of the valve hole 11 is airtightly closed by an end plate 13 fixed to the valve body 7 via a seal ring 15, and the electromagnetic operating portion 5 is provided at the other end of the valve body 7.

The valve body 9 which slides in the valve hole 11 has a valve rod 19 having an axial through hole 19a and an annular poppet-shaped member fitted in a storage groove 35 on the outer periphery of the valve rod 19. The first and second seal members 21 and 23, the seal rings 25 fitted to both ends in the axial direction, and the guide rings 27 fitted closer to the central portion in the axial direction than the seal rings 25, Due to the sliding of the body 9, the first seal member 21 by the electromagnetic operating unit 5 blocks the communication between the supply port P and the output port A, and the second seal member 23 communicates between the output port A and the discharge port R. Is configured to break through. A return valve spring 29 is compressed between the valve body 9 and the end plate 13, and a synthetic resin material is provided between the valve body 9 and the fixed iron core 31 of the electromagnetic operating part 5. The damper 33 is provided. In this damper 33, the through hole 19a in the valve rod 19 is formed in the damper 33.
Through holes 33a for making the pressures at both ends of the valve rod 19 uniform by communicating with a space around the valve rod 19.

Next, a poppet type seal member will be described with reference to FIG. 2. The structure of the first seal member 21 and the second seal member 23, and the opening / closing action of the valve seat are as follows.
Since the seal member 21 cuts off the communication between the supply port P and the output port A, and the second seal member 23 cuts off the communication between the output port A and the discharge port R, it is substantially the same. In the following description, the first seal member 21 will be described, and the description of the second seal member 23 will be omitted.

The first seal member 21 is formed of an elastic member such as synthetic rubber, and is fitted in a storage groove 35 provided around the valve body 9 with a margin in the groove width direction. ,
As a result, the space S formed between the housing groove 35 and the inner surface 11a of the valve hole 11 around the housing groove 35 has a volume substantially equal to that of the seal member 21. Then, the seal member 21 protrudes from the storage groove 35 and protrudes from the valve seat 12
In the protruding portion whose diameter is larger than that of the sealing surface 12a in
As shown in detail in FIG. 2, a sealing surface 21a is formed which protrudes in a substantially semicircular shape in cross section and which is brought into contact with and separated from the sealing surface 12a in the axial direction of the valve hole 11, and the protruding portion is formed. Is to have flexibility in order to secure its free bending when the sealing surface 21a and the valve seat 12 are pressed against each other.
Sealing surface 2 of the protruding portion that abuts the valve seat 12
The upper edge of the surface opposite to 1a is cut out in a substantially arc shape. The seal member 21 shown by a solid line in FIG.
Indicates the state before deformation that is not pressed against the valve seat,
The seal member 21 shown by a chain line shows the shape after the deformation.

As shown in FIG. 3, a plurality of radial passage grooves 2 are formed on the surface opposite to the sealing surface 21a.
1b is provided, and the passage groove 21b prevents the first seal member 21 and the side wall of the storage groove 35 from adhering to each other. The sealing surface 21a of the sealing member 21 is projected in a substantially semicircular shape in cross section in the first embodiment shown in FIG. 2, but may have any shape such as a rectangular shape, a trapezoidal shape, or a triangular shape. The upper edge of the surface opposite to the seal surface 21a is cut out in a substantially arc shape, but as shown in the modification of FIG. You can also do it.

The electromagnetic operating section 5 is, as shown in FIG.
Bobbin 39 wound with exciting coil 37 and exciting coil 37
A magnetic frame 41 that surrounds the bobbin 39, a fixed iron core 31 that is inserted and fixed at one end of the center hole of the bobbin 39, a movable iron core 47 that is slidably inserted in the center hole of the bobbin 39, and the fixed iron core 31. , One end faces the valve rod 19 via the damper 33, and the other end includes a push rod 53 urged toward the valve rod 19 by a spring 49 via a damper 51 in the movable iron core 47. The outer peripheral surface of the frame 41 is molded 55 of synthetic resin, and is attached to one side of the valve portion 3 by an appropriate means such as a mounting bolt (not shown).

The urging force of the spring 49 is set to be larger than the urging force of the valve spring 29, and when the coil 37 is energized, as shown in the lower half of FIG. When the second seal member 23 is pressed against the valve seat 12 with a force corresponding to the difference between the force of the spring 49 and the force of the spring 29 and the coil 37 is de-energized, the upper half of FIG. Thus, the first seal member 21 is pressed against the valve seat 12 between the output port A and the supply port P by the biasing force of the spring 29.

In FIG. 1, reference numeral 57 is a stop pin inserted to receive the end of the spring 49 in the movable iron core 47, 59 is the outer end cover of the electromagnetic operating portion 5, and 61 is the cover 59. It shows a manual push button made of a flexible synthetic resin which is attached and can be pressed against the end face of the movable iron core 47 by the pressing.

The first embodiment is the same as the first poppet type.
As shown by the chain line in FIG. 2, the protruding portion on the outer peripheral portion of the seal member 21 has the flexibility to elastically bend when the seal member 21 is brought into pressure contact with the valve seat 12. When the seal member 21 and the valve seat 12 are brought into contact with each other, the projecting portion elastically bends to absorb the impact, so that an appropriate valve closing force can be obtained by the above-mentioned deflection, and at the same time, the seal member can be obtained. It is possible to reduce wear and tear due to the opening / closing operation of 21, and also to reduce the impact between the dampers 33, 51 and the push rod 53 and between the fixed iron core 31 and the movable iron core 47, so that the respective abutments are abutted. It is also possible to reduce wear on the surface. In addition, the valve seat 1 of the protruding portion
By compressing the upper edge portion on the side opposite to the sealing surface 21a with which the 2 abuts, into a substantially arcuate shape or an inclined surface shape, compression acting on the protruding portion when the sealing member 21 and the valve seat 12 abut The force can be adjusted, and the shock absorption due to the valve closing force can be set appropriately.

From the above, the seal member 21 and the valve seat 1 are
It is possible to stabilize the sealing property between the two and the durability of the poppet valve.

Moreover, the valve seat 12 is formed integrally with a part of the valve body 7, and the accommodating groove 35 and the valve hole 11 around the accommodating groove 35 are formed.
If the space S formed between the inner surface 11a and the inner surface 11a is formed to have a volume substantially equal to that of the seal member 21, the inside of the storage groove 35
Since the flexible bending of the seal member 21 is ensured at the time of assembling, when assembling the poppet valve, the valve rod 19 having the seal member 21 fitted in the housing groove 35 is simply press-fitted into the valve hole 11 of the valve body 7. It is easy to carry out, and the number of parts is small, which is economically advantageous.

FIG. 4 shows a second embodiment in which the present invention is applied to a direct acting solenoid valve. In this embodiment, the valve seat 12 in the direct acting solenoid valve 1 of the first embodiment described above is shown. Is integrally formed with a sealing surface 112a protruding in the axial direction of the valve hole 11, and the sealing surface 112 of the valve seat 12 in the poppet-shaped sealing member 21 is formed.
The sealing surface 12 that comes in contact with and separates from the valve hole 11 in the axial direction of the valve hole 11.
1a is formed in a flat shape. The seal surface 112a of the valve seat 12 is the valve hole 11 formed in the valve portion 3.
The groove 112b is formed around the valve seat surface perpendicular to the axial direction of the groove.

Since the other constructions and operations of the second embodiment are substantially the same as those of the first embodiment, the same or corresponding parts are designated by the same reference numerals and their explanations are omitted.

In the above first and second embodiments, the case where the poppet valve of the present invention is applied to the electromagnetically operated direct acting solenoid valve is described, but the present invention is not limited to this. It can be configured as a fluid pressure operation type or a mechanical operation type, and can also be applied to a pilot type valve controlled by a pilot valve. Further, the poppet valve is configured as a well-known 3-port valve that connects the output port A to the supply port P and the discharge port R to communicate with each other, but is not limited to the 3-port valve, and is a 4-port valve. Alternatively, it can be a 5-port valve.

[0024]

As described in detail above, according to the poppet valve of the present invention, the poppet type seal member is provided with a degree of freedom in the axial deflection of the valve rod, so that the seal member and the valve seat are separated from each other. It is possible to absorb the impact at the time of contact and reduce the wear of the above-mentioned seal member, which in turn stabilizes the sealability between the seal member and the valve seat and improves the durability of the poppet valve. Can be planned.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a direct acting solenoid valve according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the main part.

FIG. 3 is a perspective view of a poppet-shaped seal member according to the first embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part of a direct acting solenoid valve according to a second embodiment of the present invention.

[Explanation of symbols]

 7 valve body 11 valve hole 11a inner surface 12 valve seat 12a, 112a sealing surface 19 valve rod 21 first sealing member 21a, 121a sealing surface 23 second sealing member 35 storage groove P supply port A output port R discharge port S space

Claims (3)

[Claims] 1. A valve body is provided with a valve hole into which a valve rod is slidably inserted and a plurality of ports communicating with the valve hole, and the valve rod is driven by a drive mechanism, whereby A poppet valve in which a valve seat formed between ports is opened and closed by an annular poppet-shaped sealing member provided on the valve rod to switch the flow of fluid between ports. A valve seat having a sealing surface orthogonal to the axial direction of the valve hole is provided by expanding the diameter, and the sealing member is formed by an elastic member and fitted into a storage groove provided around the valve rod. The sealing member is formed on a protruding portion projecting from the housing groove and having a diameter larger than that of the sealing surface of the valve seat, the sealing surface contacting and separating from the sealing surface of the valve seat in the axial direction of the valve hole. The seal member is attached to the protrusion on the outer periphery of the valve. Poppet valve characterized by flexing flexible remembering, that in order to press the. 2. The poppet valve according to claim 1, wherein the valve seat is formed integrally with a part of the valve body, and a space formed between the storage groove and the inner surface of the valve hole around the storage groove is formed. A poppet valve having a volume substantially equal to that of the seal member. 3. The poppet valve according to claim 1 or 2, wherein the upper edge of the protruding portion of the seal member opposite to the seal surface with which the valve seat abuts is cut into a substantially arc shape or an inclined surface shape. A poppet valve characterized in that the flexibility of the notch and the protruding portion is adjusted.