JP5203022B2 - Check valve - Google Patents

Description

  The present invention relates to a check valve which is attached to a fluid pipe such as liquid or gas and allows a forward flow of fluid from the inlet to the outlet, but prevents the flow in the reverse direction, that is, the flow from the outlet to the inlet. The present invention relates to a structure for guiding a valve body to an annular valve seat.

  The check valve has a valve casing that forms an inlet, a valve chamber, and an outlet. An annular valve seat is provided between the inlet and the valve chamber. A disc-shaped valve element that opens and closes the annular valve seat is disposed in the valve chamber. A coil spring for urging the valve body to the annular valve seat is provided, a protrusion is provided on the outer periphery of the disc-shaped valve body, and a sliding cylindrical surface on which the outer surface of the protrusion on the outer periphery of the disk-shaped valve body is in sliding contact is formed on the inner peripheral wall of the valve casing. Is. When the fluid pressure at the inlet becomes larger than the fluid pressure at the outlet and the biasing force of the coil spring, the disc-like valve body compresses the coil spring and moves away from the annular valve seat, and the inlet fluid is located between the protrusions on the outer circumference of the disc-like valve body. Flow through to the exit. When the fluid pressure at the inlet becomes smaller than the fluid pressure at the outlet and the biasing force of the coil spring, the disc-shaped valve body is displaced toward the inlet and is seated on the annular valve seat, thereby preventing the backflow of fluid from the outlet to the inlet.

When the disc-shaped valve element is in contact with the annular valve seat in a tilted state when the disc-shaped valve element is seated on the annular valve seat, the protrusion on the outer periphery of the disc-shaped valve element causes the cylindrical surface of the valve casing inner wall to slide. Therefore, there is a problem that the disc-shaped valve body cannot completely close the annular valve seat and fluid leaks from the outlet to the inlet.
Japanese Utility Model Publication No. 60-10964

  The problem to be solved is to provide a check valve that can completely close the annular valve seat even if the disk-shaped valve body contacts the annular valve seat in a tilted state when seated on the annular valve seat. It is to be.

  In the present invention, an inlet, a valve chamber, and an outlet are formed in a valve casing, an annular valve seat is provided between the inlet and the valve chamber, and a disc-shaped valve body that opens and closes the annular valve seat is disposed in the valve chamber. A coil spring that urges the body toward the annular valve seat is provided, a protrusion is provided on the outer periphery of the disc-shaped valve body, and a sliding contact cylindrical surface on which the outer surface of the protrusion on the outer periphery of the disk-shaped valve body is in sliding contact is formed on the inner peripheral wall of the valve casing In the above, at the position where the disc-like valve body is seated on the annular valve seat, the R-side is applied to the outlet side end of the outer surface of the protrusion on the outer periphery of the disc-like valve body, the R-side is applied to the inlet side end of the sliding cylindrical surface of the valve casing The R-processed part of the protrusion on the outer periphery of the disc-shaped valve body and the R-processed part of the sliding contact cylindrical surface of the valve casing are fitted.

  In the present invention, since the disc-like valve body can be tilted in all directions at the position where it abuts against the valve seat member, even when the disc-like valve body is seated on the annular valve seat, The disc-shaped valve body can completely close the annular valve seat, and an excellent effect is obtained that fluid does not leak from the outlet to the inlet.

  In the present invention, R processing is performed on the outlet side end of the outer surface of the protrusion on the outer periphery of the disc-shaped valve body, R processing is performed on the inlet side end of the sliding contact cylindrical surface of the valve casing, and the disc-shaped valve body is seated on the annular valve seat. In this position, the R-processed portion of the protrusion on the outer periphery of the disc-shaped valve body is fitted to the R-processed portion of the sliding cylindrical surface of the valve casing. Therefore, the disc-like valve body can be inclined in all directions at the position where it contacts the valve seat member. Therefore, even if the disc-shaped valve body is in contact with the annular valve seat in a tilted state when seated on the annular valve seat, the disc-shaped valve body can completely close the annular valve seat, and fluid may leak from the outlet to the inlet. Absent.

  An inlet side member 2 having an inlet 1 and an outlet side member 4 having an outlet 3 are screwed together to form a valve casing having a valve chamber 5 between the inlet 1 and the outlet 3. An annular groove is formed at the inner end of the inlet side member 2, and an annular valve seat 6 made of synthetic rubber is fitted into the groove. A disc-shaped valve body 7 for opening and closing the annular valve seat 6 is disposed in the valve chamber 5. A coil spring 8 that urges the disc-shaped valve body 7 toward the annular valve seat 6 is disposed in the valve chamber 5.

  The disc-shaped valve body 7 has a plurality of, for example, eight protrusions 9 on the outer periphery. On the inner peripheral wall of the outlet side member 4, a four-stage cylindrical surface having a diameter that gradually decreases toward the outlet 3 is formed. The second cylindrical surface from the inlet 1 side is a sliding contact cylindrical surface 10 in which the outer surface of the protrusion 9 of the disc-like valve body 7 is in sliding contact. The outer ends of the protrusions 9 of the disc-shaped valve body 7 are all located on concentric circles, and the diameter of the concentric circles is slightly smaller than the sliding contact cylindrical surface 10 of the outlet side member 4 so as to loosely contact the sliding contact cylindrical surface 10. Like that.

  An annular step portion 11 between the sliding contact cylindrical surface 10 and the third cylindrical surface from the inlet 1 side restricts the movement range of the disk-shaped valve body 7 due to the projection 9 of the disk-shaped valve body 7, and the coil spring 8 to prevent over-compression. The spring receiver 13 hits the annular step 12 between the third cylindrical surface and the fourth cylindrical surface from the inlet 1 side. The spring receiver 13 has a hole 14 in the center, and a plurality of holes 15 around the center hole 14. In the spring receiver 13, the edge of the central hole 14 is bent toward the inlet 1, and the coil spring 8 is disposed between the bent corner and an annular groove formed on the side surface of the outlet 3 of the disc-like valve body 7.

  The protrusion 9 on the outer periphery of the disc-shaped valve body 7 is subjected to R machining on the outer surface outlet 16 side end 16. The sliding contact cylindrical surface 10 of the outlet side member 4 is subjected to R machining on the inlet 1 side end 17. A portion 16 where the disc-like valve body 7 is seated on the annular valve seat 6 and a portion 16 where the protrusion 9 on the outer periphery of the disc-like valve body 7 is rounded and a portion where the sliding contact cylindrical surface 10 of the outlet side member 4 is rounded. 17 is fitted. Therefore, the disc-like valve body 7 can be tilted in all directions at the position where it abuts on the valve seat member 6, and abuts against the annular valve seat 6 in a tilted state when the disc-like valve body 7 is seated on the annular valve seat 6. However, the disc-like valve body 7 can completely close the annular valve seat 6, and fluid does not leak from the outlet 3 to the inlet 1.

  When the fluid flows in from the inlet 1 and the fluid pressure becomes larger than the fluid pressure on the outlet 3 side and the urging force of the coil spring 8, the disc-shaped valve body 7 compresses the coil spring 8 and separates from the annular valve seat 6. As a result, the fluid at the inlet 1 flows to the outlet 5 through the space between the protrusions 9 on the outer periphery of the disc-shaped valve body 7.

When the fluid pressure at the inlet 1 becomes smaller than the fluid pressure at the outlet 3 and the biasing force of the coil spring 8, the disc-like valve body 7 is displaced toward the inlet 1 and is seated on the annular valve seat 6. Prevent backflow of fluid.

Sectional drawing which shows the Example of the non-return valve of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inlet 2 Inlet side member 3 Outlet 4 Outlet side member 5 Valve chamber 6 Annular valve seat 7 Disc-shaped valve body 8 Coil spring 9 Protrusion 10 Sliding contact cylindrical surface 16 Outlet side end 17 of protrusion outer surface of disc-shaped valve body outer periphery Outlet side member Entrance end of cylindrical surface of sliding

Claims (1)

The valve casing forms an inlet, a valve chamber, and an outlet. An annular valve seat is provided between the inlet and the valve chamber. A disc-shaped valve body that opens and closes the annular valve seat is disposed in the valve chamber. A coil spring that urges the seat is provided, a protrusion is provided on the outer periphery of the disc-shaped valve body, and a sliding contact cylindrical surface on which the outer surface of the protrusion on the outer periphery of the disk-shaped valve body is in sliding contact is formed on the inner peripheral wall of the valve casing. R processing is performed on the outlet side end of the outer surface of the protrusion on the outer periphery of the valve body, R processing is performed on the inlet side end of the sliding cylindrical surface of the valve casing, and the disc-shaped valve body outside the disc-shaped valve body at the position where the disc-shaped valve seat is seated on the annular valve seat A check valve characterized in that a rounded portion of a circumferential projection is fitted to a rounded portion of a sliding contact cylindrical surface of a valve casing.

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