JPS6224133Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device that prevents fluid from leaking between two cylindrical surfaces that slide relative to each other.

Conventionally, in Figures 1, 2 and 3,
A packing mounting groove 3 provided on the circumference of one of the two cylindrical surfaces, the piston outer surface 1a and the cylinder inner surface 2, that is, the piston outer surface 1a, and the other cylindrical surface, that is, the cylinder inner surface 2 and the packing mounting groove. The cross section of the surface 5 in contact with the bottom surface 4 of 3 and the surface 6 in contact with the cylinder inner surface 2 are formed into a convex shape, and the intermediate between the end surfaces 7 and 8 in the axial direction is formed into a concave portion 9 and 1.
0 and a cross section surrounded by a connected outer line, and is mounted in the packing mounting groove 3 and compressed in the radial direction between the bottom surface 4 of the packing mounting groove 3 and the inner surface 2 of the cylinder, thereby discharging pressurized fluid. There is a sealing device consisting of a sealing gasket 11,
When fluid pressure is applied from the left side of the piston 1, the piston 1 moves to the right in FIG. 3, and the seal 11 also moves to the right in the mounting groove 3.
The right end surface 8 of the gasket stops in close contact with the right side surface 12 of the mounting groove 3. Next, when fluid pressure is applied from the right side of the piston 1, the right end surface 8 of the seal 11 is in close contact with the right side surface 12 of the mounting groove 3 in FIG.
and the right side surface 12 of the mounting groove 3,
Since the packing 11 does not have a self-sealing effect due to fluid pressure, the fluid may leak through the space between the packing 11 and the surface 6 that contacts the inner surface 2 of the cylinder.

The present invention has been made with the aim of eliminating the drawbacks of the conventional ones, and is to allow fluid pressure to easily enter between the axial end surface of the packing and the axial end surface of the packing mounting groove. Accordingly, there is provided a sealing device that completely prevents fluid leakage by reliably producing a self-sealing effect on the packing due to fluid pressure.

The present invention will be explained below with reference to the drawings.

An embodiment in which the present invention is applied to a piston seal is shown in FIGS. 5, 6, and 7. The cross sections of the groove 3, the cylinder inner surface 2, the surface 5 in contact with the bottom surface 4 of the packing mounting groove 3, and the surface 6 in contact with the cylinder inner surface 2 are formed in a convex shape, and a recess 9 is formed between the end surfaces 7 and 8 in the axial direction. and 10, and has a cross section surrounded by an external line formed and connected to the bottom surface 4 of the packing mounting groove 3 and the cylinder inner surface 2
A sealing device comprising a packing 11 that is compressed in the radial direction between the packing 11 and the axial end surface of the protruding portion of the packing 11 on the side that contacts the bottom surface 4 of the mounting groove 3 and the side that contacts the cylinder inner surface 2. 7 and 8 are provided with protrusions 13, 14 and 15, 16. The protrusions 14 and 16 provided on the protrusion of the packing 11 on the side that contacts the cylinder inner surface 2 have notches 17 and are discontinuously formed on the circumference.

Therefore, in FIG. 7, when fluid pressure is applied from the left side of the piston 1, the piston 1 moves to the right and the seal 11 also moves to the right, so that the protrusions 15 and 16 on the right side surface 8 of the seal 11 are attached. It stops in close contact with the right side surface 12 of the groove 3. Next, when fluid pressure is applied from the right side of piston 1,
In FIG. 8, the protrusion 16 on the right end surface of the packing 11 in contact with the cylinder inner surface 2 has a notch 17 and is discontinuous on the circumference. into the recess 10 and press the gasket 11 against the left side surface 18 of the mounting groove 3. Therefore, the gasket 11 is pressed against the cylinder inner surface 2 and the mounting groove bottom surface 4 to produce a self-sealing effect, so that no fluid leaks.

Note that when the present invention is applied to a rod packing, the notches 17 are provided in the protrusions 13 and 15 on the inner peripheral side.

Further, other embodiments of the present invention are shown in FIGS. 9 and 10.
In the figure, protrusions 13, 14 and 1 provided on the axial end faces 7 and 8 of the protrusion of the packing 11 are shown.
5 and 16 are all provided with notches 17, which are formed discontinuously in the circumferential direction. It can be used both as a piston packing and as a rod packing, and its operation and effect are the same as those of the previous embodiment, and fluid leakage is completely prevented.

As described above, according to the present invention, fluid pressure easily enters between the axial end surface of the packing and the axial end surface of the packing mounting groove, so that the packing reliably produces a self-sealing effect due to the fluid pressure, and the fluid Leakage is completely prevented.

[Brief explanation of drawings]

1 to 4 show conventional examples, and FIGS. 5 to 10 show embodiments of the present invention.
Figures 5 and 9 are sectional views of the packing, Figures 2, 6 and 10 are front views of the inner surface of the packing, and Figures 3, 4, 7 and 8 are seals. FIG. 2 is a partial cross-sectional view of the device. 1...Piston, 2...Cylinder inner surface, 3...
Mounting groove, 4...Bottom surface of mounting groove, 7, 8...End face of packing, 9, 10...Recessed part of packing, 11...
Patchkin, 13, 14, 15, 16...protrusion, 1
7... Notch.

Claims (1)

[Scope of utility model registration request] A gasket mounting groove provided on the circumference of one of the two cylindrical surfaces and the other cylindrical surface, and a surface in contact with the bottom surface of the mounting groove provided in the one cylindrical surface and a surface in contact with the other cylindrical surface. The cross section is formed into a convex shape and is surrounded by an outline line with a concave portion formed in the middle of the end face in the axial direction, and is mounted in the packing mounting groove and between the bottom surface of the packing mounting groove and the other cylindrical surface. A sealing device comprising a packing that is compressed in a radial direction by a gasket, wherein at least the other cylindrical surface of the gasket is provided with at least the other end surface in the axial direction of the bottom surface side of the mounting groove provided on the one cylindrical surface and the protrusion on the other cylindrical surface side. 1. A sealing device comprising projections discontinuously formed on the circumference of a projection on a cylindrical surface side.