JP2021060078A - solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve housing 1 having an inflow port 11, a valve chamber 12 communicating with the inflow port 11, and a valve seat 14 having a valve hole 13 opened at one end of the valve chamber 12 in the axial direction. In the solenoid valve provided in the valve chamber 12, the valve body 2 facing the valve seat 14 and the electromagnetic solenoid 3 for moving the valve body 2 forward and backward in the axial direction toward the valve seat 14 are provided in the valve chamber 12. Even if the pressure becomes high, it is possible to prevent the valve body 2 from bending so as to bite into the valve hole 13 when the valve is closed. SOLUTION: A plurality of protrusions 15 are provided on a valve seat 14 so as to project into a valve hole 13 to prevent the valve body 2 from biting into the valve hole 13 with a circumferential interval. [Selection diagram] Fig. 1

Description

The present invention mainly relates to a solenoid valve installed in a gas pipe.

Conventionally, this type of solenoid valve has a valve housing having an inlet, a valve chamber communicating with the inlet, and a valve seat having a valve hole located at one end in the axial direction of the valve chamber, and a valve chamber. It is provided with a valve body facing the valve seat and an electromagnetic solenoid that moves the valve body forward and backward in the axial direction toward the valve seat (see, for example, Patent Documents 1 and 2).

When such a solenoid valve is installed in the gas pipe, if an abnormality occurs in which the supply gas pressure becomes high due to a failure of the gas regulator or the like, the elasticity of rubber or the like due to the high pressure in the valve chamber when the solenoid valve is closed. The valve body made of material bends so as to bite into the valve hole. Then, due to this bending, wrinkles may be generated in a part of the portion of the valve body in contact with the valve seat, resulting in poor valve closing, or the valve body may bite into the valve hole and cause poor valve opening. is there.

Japanese Unexamined Patent Publication No. 2000-205432 Japanese Unexamined Patent Publication No. 2017-57935

In view of the above points, it is an object of the present invention to provide a solenoid valve capable of preventing valve closing failure and valve opening failure due to bending of the valve body even when the valve chamber becomes high pressure.

In order to solve the above problems, the present invention has a valve having an inflow port, a valve chamber communicating with the inflow port, and a valve seat having a valve hole located at one end of the valve chamber in the axial direction. In an electromagnetic valve provided with a housing, a valve body facing the valve seat, and an electromagnetic solenoid that advances and retracts the valve body in the axial direction toward the valve seat, the valve seat projects into the valve hole. Therefore, a plurality of protrusions for suppressing the biting of the valve body into the valve hole are provided at intervals in the circumferential direction.

According to the present invention, even if the pressure inside the valve chamber becomes high, it is possible to prevent the valve body from bending by biting into the valve hole when the valve is closed by the protrusion provided on the valve seat. Therefore, it is possible to prevent valve closing failure and valve opening failure due to bending of the valve body.

In the present invention, it is desirable that the axial end edge of each protrusion on the valve chamber side is located at a position where the valve body of the valve seat is inserted into the valve hole by a predetermined minute distance from the seatable valve seat surface. According to this, even if the position of the axial end edge of the protrusion on the valve chamber side is slightly deviated to the valve chamber side due to the manufacturing tolerance, the end edge does not protrude from the valve seat surface into the valve chamber. Therefore, when the valve is closed, the valve body is surely in contact with the valve seat surface, and the sealing property is ensured.

The cut side view of the solenoid valve of embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. FIG. 2 is a cross-sectional view corresponding to FIG. 2 of another embodiment.

FIG. 1 shows a solenoid valve according to an embodiment of the present invention, which is interposed in a gas pipe. This solenoid valve has a valve housing having an inflow port 11, a valve chamber 12 communicating with the inflow port 11, and a valve seat 14 having a valve hole 13 opened at one end of the valve chamber 12 in the axial direction. 1 and a valve body 2 made of an elastic material such as rubber facing the valve seat 14 provided in the valve chamber 12, and an electromagnetic solenoid 3 for moving the valve body 2 forward and backward toward the valve seat 14 in the axial direction. I have.

The electromagnetic solenoid 3 includes a coil 31, a bobbin 32 around which the coil 31 is wound, a pair of collars 33 and 33 inserted in the bobbin 32 for magnetic field transmission, and a guide cylinder 34 inserted in these collars 33 and 33. , A movable iron core 35 that is slidably inserted into the guide cylinder 34 from one end side in the axial direction and has a valve body 2 connected to one end portion in the axial direction, and a shaft in the guide cylinder 34. It has a fixed iron core 36 arranged so as to face the movable iron core 35 at a portion closer to the other end in the direction, and a spring 37 for urging the movable iron core 35 in one axial direction via the valve body 2. When the coil 31 is not energized, the movable iron core 35 moves in one axial direction due to the urging force of the spring 37, and the valve body 2 is displaced to the closed position seated on the valve seat 14. On the other hand, when the coil 31 is energized, the movable iron core 35 moves in the opposite direction in the axial direction against the urging force of the spring 37 and is attracted to the fixed iron core 36, and the valve body 2 is displaced to the opening position separated from the valve seat 14. .. Further, a cushioning member 35a for alleviating a shock when the movable iron core 35 is attracted to the fixed iron core 36 is provided at a portion of the movable iron core 35 facing the fixed iron core 36.

By the way, if an abnormality occurs in which the supply gas pressure becomes high due to a failure of the gas regulator or the like, the valve body 2 bends so as to bite into the valve hole 13 due to the high pressure in the valve chamber 12 when the solenoid valve is closed. Sometimes. When this bending occurs, wrinkles are generated in a part of the valve body 2 in contact with the valve seat 14, resulting in a valve closing failure in which gas leaks, or the valve body 2 bites into the valve hole 13. Even if the coil 31 is energized, the valve body 2 may not be displaced to the open position, resulting in a valve opening failure.

Therefore, in the present embodiment, as is clearly shown in FIG. 2, the valve seat 14 has protrusions 15 that project into the valve hole 13 and suppress the biting of the valve body 2 into the valve hole 13 at intervals in the circumferential direction. There are multiple existing ones. In the present embodiment, the plurality of protrusions 15 extend to the center of the valve hole 13 and intersect with each other. However, as in the embodiment shown in FIG. 3, the protrusions 14 extend to the valve seat 14 to the center of the valve hole 13. A relatively short protrusion 15 may be provided.

If the protrusion 15 is provided as described above, even if the inside of the valve chamber 12 becomes high pressure, the protrusion 15 can prevent the valve body 2 from bending so as to bite into the valve hole 13 when the valve is closed. Therefore, it is possible to prevent the above-mentioned valve closing failure and valve opening failure due to the bending of the valve body 2. The embodiment in which the protrusion 15 extends to the center of the valve hole 13 in which the valve body 2 bends most is more advantageous in suppressing the bending of the valve body 2.

Further, in the embodiment shown in FIG. 1, the axial end edge of each protrusion 15 on the valve chamber 12 side is predetermined in the valve hole 13 rather than the valve seat surface 14a on which the valve body 2 of the valve seat 14 can be seated. It exists at a position where a minute distance L (for example, 0.7 mm) is inserted. This minute distance L is set to be slightly larger than the expected maximum value of the amount of misalignment due to the manufacturing tolerance of the edge of the protrusion 15. As a result, even if the position of the end edge of the protrusion 15 shifts toward the valve chamber 12 due to manufacturing tolerances, the end edge does not protrude from the valve seat surface 14a into the valve chamber 12. Therefore, when the valve is closed, the valve body 2 is surely in contact with the valve seat surface 14a, and the sealing property is ensured.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, the protrusion 15 is integrally formed with the valve seat 14, but a ring-shaped member having the protrusion 15 may be fitted into the valve hole 13.

1 ... valve housing, 11 ... inflow port, 12 ... valve chamber, 13 ... valve hole, 14 ... valve seat, 14a ... valve seat surface, 15 ... protrusion, 2 ... valve body, 3 ... electromagnetic solenoid, L ... minute distance ..

Claims (2)

A valve housing having an inflow port, a valve chamber communicating with the inflow port, and a valve seat having a valve hole located at one end in the axial direction of the valve chamber, and a valve seat provided in the valve chamber. In a solenoid valve including a valve body facing the valve body and an electromagnetic solenoid that advances and retracts the valve body in the axial direction toward the valve seat.
A solenoid valve characterized in that a plurality of protrusions are provided on the valve seat so as to project into the valve hole to prevent the valve body from biting into the valve hole at intervals in the circumferential direction. The axial end edge of each of the protrusions on the valve chamber side is located at a position where the valve body of the valve seat is inserted into the valve hole by a predetermined minute distance from the seatable valve seat surface. The solenoid valve according to claim 1.

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