JPS632167Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-pressure container sealing device, and more specifically, to a high-pressure container sealing device in a hydrostatic extrusion press.

As a sealing device for a high-pressure container, that is, a container in a hydrostatic extrusion press, a sealing device consisting of a packing member is provided on the die side that sets the shape of the extruded material and on the pressure stem side, respectively, in order to prevent pressure medium leakage. It is being

Referring to FIG. 1, a conventional sealing device will be briefly described on the pressure stem side.

In FIG. 1, reference numeral 1 denotes a seal piston, which is fitted into the container 2 and attached to the tip of the pressurizing stem 7.

Numerals 3, 4, and 5 each designate a packing component, which is comprised of a low-pressure side seal packing 3, a back-up spring 4, and a high-pressure side seal packing 5, and is mounted on the high-pressure side outer circumferential portion of the seal piston 1, respectively.

6 is a packing holder, which is attached to the seal piston 1 via a bolt 10; 8 is a pressure medium; 9 is a seal holder;
11 indicates a billet, and 11 indicates a mandrel.

In FIG. 1, the pressure stem 7 moves relatively to the left in the figure, so that the billet 9 is pressure-formed through a die device (not shown). At this time, the container 2 Although the inner diameter d of the seal piston 1 is distorted as shown by Δd, and the sealing components 3, 4, and 5 are deformed following the distortion, the seal piston 1 is not deformed accordingly, so there is a gap between it and the inner peripheral surface of the container 2. is formed, and the packing components 3, 4, and 5 so-called protrude into these gaps, resulting in poor sealing performance and shortened service life.

In particular, in the current situation where there is a demand for larger containers 2, the larger the inner diameter of the container, the larger the absolute value of the strain △d.
The sealing performance has deteriorated significantly, and measures to improve it are urgently needed.

Therefore, the present invention has been devised in view of the above-mentioned problems, and has been improved to reduce the gap as much as possible in order to prevent the packing member from protruding. , has a packing facing part facing the high-pressure side end surface of the packing component member at its low-pressure side outer peripheral end, and a structure to be fitted and arranged in the high-pressure vessel, and a structure that is fitted and arranged in the high-pressure container, and a packing facing part facing the high-pressure side end face of the packing member on the outer circumference of the high-pressure side end. a support member having a tapered surface having a small diameter and whose high-pressure side end surface abuts the low-pressure side end surface of the structure; and a tapered surface that fits into the tapered surface of the support member is formed on the inner circumferential surface and is connected to the high-pressure side. It has a truncated conical part having a small diameter part and a tapered surface that becomes larger in diameter toward the low pressure side on the low pressure side. a seal piston ring disposed facing an object and configured such that a gap exists between the low-pressure side end face and the support member under atmospheric pressure; It is an object of the present invention to provide a sealing device for a high-pressure container, characterized in that a communicating hole for introducing a pressure medium is formed in a structure to move in the axial direction in a gap to expand a packing component.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 2 shows an embodiment in which the present invention is applied to the pressurized stem side, and 20 is a high pressure vessel shown as a container;
Reference numeral 1 indicates a billet, 22 a pressure medium, and 23 a pressure stem.

Reference numeral 24 denotes a structure, which in this example is a seal retainer that is fitted and arranged inside the high-pressure container 20, and has a seal facing portion facing the high-pressure side end surfaces of the seal constituent members 25, 26, 27 at its low-pressure side outer peripheral end. 28, and a port portion 29 having an annular recess is formed radially inward of the packing facing portion 28 on the low-pressure side end surface thereof.

Further, in this example, a communication hole 30 through which high pressure fluid, ie, pressure medium 22, is introduced into the port portion 29 is provided in parallel to the axial direction.

Reference numeral 31 denotes a support member, which is a first seal piston ring in this example, and is attached to the tip of the pressurizing stem 23, to which the structure 24 is attached via a bolt 32.

The support member 31 has a tapered surface 33 on the outer periphery of the high-pressure side end, the diameter of which gradually decreases toward the high-pressure side, and the high-pressure side end surface abuts the low-pressure side end surface of the structure 24,
The structure 24 is attached via the aforementioned bolts 32.

34 is a seal piston ring, which in this embodiment is essentially a second seal piston ring;
A tapered surface 35 that fits into the tapered surface 33 of the support member 31 is formed on the inner circumferential surface of the cone, and has a small diameter portion 36 on the high pressure side and a tapered surface 37 that gradually becomes larger in diameter toward the low pressure side. It is configured to have a trapezoidal portion 38.

Then, the tapered surface 37 of the small diameter portion 36 and the truncated conical portion 38 of the seal piston ring 34
A packing component consisting of a low-pressure side seal packing 25, a back spring 26, and a high-pressure side seal packing 27 is fitted into the structure, and the high-pressure side end face, which is a small diameter portion 36, is arranged facing the port portion 29 of the structure 24. and its length is the same as that of the support member 3.
The length in the axial direction of the tapered surface 33 of No. 1 is shorter than the axial length of the tapered surface 33 of No. 1, and the low-pressure side end surface and the support member 3
1, there is an axial clearance 39 between the two.

The first embodiment of the present invention illustrated in FIG. 2 is a so-called self-pressure sealing device, and its operating principle will be explained with reference to FIG. When the billet 21 is hydrostatically extruded using a die device (not shown), the high-pressure container 20 is subjected to distortion in the radially outward direction, as in the conventional example described above, and as a result, the packing components 25, 26 are , 27 are subjected to follow-up deformation.

At this time, high-pressure fluid is introduced into the port portion 29 through the communication hole 30, and the seal piston ring 34 is pressed in the direction of the arrow in FIG. 3 through the increased pressure of the high-pressure fluid. Gap 3
9 allows axial movement and the tapered surfaces 33, 35 allow the structure to expand radially outward, so as shown in the figure, the gaps from which the packing components 25, 26, 27 protrude are extremely small. This will make the sealing effect perfect.

In Fig. 2, reference numeral 40 indicates a mandrel, but since the present invention is applicable not only to tubular products but also to a sealing device for a high-pressure container for a hydrostatic extrusion press for solid products, the mandrel is used. 40 is not necessarily required.

FIG. 4 shows a second embodiment in which the present invention is applied to a die device, in which 24 is a structure, which in this embodiment is a die having a die chip 41. and,
Similar to the first embodiment described above, the seal facing part 2
8. The port portion 29, the communication hole 30, etc. are configured in the same manner as described above, except that the communication hole 30 has a cross section L.
It is formed into a letter shape.

Reference numeral 31 denotes a support member, which is a die case in this example, to which the die, which is the structure 24, is attached via bolts 42, and the support member 31 also has a tapered surface 33 having the same configuration as the first embodiment described above. It is formed of.

Then, a seal piston ring 34 having the same configuration as in the first embodiment described above is fitted onto the tapered surface 33 with an axial clearance 39 in the same manner as described above, and the seal component members 25 and 2 are fitted onto the ring 34.
6 and 27 are fitted.

In the embodiment shown in FIG. 5, as a packing component,
The difference is that the back-up spring is omitted and a square so-called lift gasket 43 made of pure copper, synthetic resin, etc. is installed as a high-pressure side seal gasket, and the other configuration is the same as the first embodiment shown in FIG. Therefore, common parts are indicated by common reference numerals.

In the embodiment shown in FIG.
6 and 27 and that a so-called soft packing 43 is attached to the highest pressure side, this embodiment differs from the first embodiment described above, and the other basic configurations are the same as the first embodiment. Parts are indicated by common symbols.

Figures 7 and 8 show the seal piston ring 3.
4 is an embodiment in which the shaft is moved and expanded in the axial direction by external force F in the extrusion process, and FIG. 7 is applied to the pressure stem side, and FIG. 8 is applied to the die device side. This is an example.

That is, in the embodiment shown in FIG. 7, a protrusion 44 having a trapezoidal cross section that comes into contact with the side end surface of the billet 21 is formed on the seal holder, which is the structure 24.
In the embodiment shown in FIG. 8, a flange 45 is engaged with the side end surface of the high pressure container 20 in the seal piston ring 34.
In both the embodiments shown in FIGS. 7 and 8, the seal piston ring 34 is expanded by the external force F in the extrusion process, and is also expanded by the high pressure fluid. It will be opened.

Since these embodiments shown in FIGS. 7 and 8 also have the same basic structure as the embodiments described above, common parts are indicated by common symbols.

However, in FIG. 7, 46 is an elastic biasing body made of a disc spring, a coil spring, or the like.

In summary, according to the present invention, even if the absolute value of strain in the high-pressure vessel becomes large, not only the sealing components are deformed accordingly, but also the seal piston ring can be expanded by moving in the axial direction. This makes it possible to reduce the gap between the inner surface of the high-pressure vessel and the outer circumferential surface of the seal piston ring, prevent the packing components from protruding, and ensure perfect sealing. Since a communication hole for introducing pressure medium is formed in the structure to move in the axial direction and expand the packing component, as the pressure of the pressure medium increases, the packing component expands and protrudes. In addition to preventing this, the sealing performance is improved and the lifespan can be expected to be extended. Therefore, it is very useful as a sealing device for various high-pressure containers including hydrostatic extrusion presses.

[Brief explanation of the drawing]

The drawings show a conventional example and some embodiments of the present invention. Fig. 1 is a sectional view of the conventional example, and Fig. 2 is a cross-sectional view of the first embodiment of the present invention.
3 is a sectional view for explaining the principle of operation, FIG. 4 is a sectional view of the second embodiment, FIG. 5 is a third embodiment, and FIG. 6 is a fourth embodiment. FIG. 7 is a sectional view of the fifth embodiment, and FIG. 8 is a sectional view of the sixth embodiment. 20...High pressure vessel, 24...Structure, 25,2
6, 27, 43...Packing component, 28...
Gasket facing part, 29...Port part, 30...Communication hole, 31...Support member, 33...Tapered surface of 31, 34...Seal piston ring, 35...
Tapered surface of 34, small diameter part of 36...34, 37
... 34 taper surface, 38 ... 34 truncated conical portion, 39 ... gap.

Claims (1)

[Scope of utility model registration request] A structure that has a packing facing part facing the high-pressure side end surface of the packing component member at its low-pressure side outer peripheral end and is fitted and arranged in the high-pressure vessel, and a structure that has a packing facing part facing the high-pressure side end face of the packing component on the outer peripheral end of the high-pressure side, and a structure that has a packing facing part facing the high-pressure side end face of the packing member on the outer circumference of the high-pressure side end, and a structure that has a packing facing part facing the high-pressure side end surface of the packing member on the outer circumference of the high-pressure side end. a support member having a tapered surface whose high-pressure side end surface abuts against the low-pressure side end surface of the structure; and a tapered surface that fits into the tapered surface of the support member on its inner circumferential surface, and a small diameter portion on the high-pressure side. It has a truncated conical portion on the low pressure side having a tapered surface that becomes larger in diameter toward the low pressure side, and a packing component is fitted into the small diameter portion and the tapered surface, and its high pressure side end surface is attached to the structure. a seal piston ring arranged facing each other and configured such that a gap exists between the low-pressure side end face and the support member under atmospheric pressure, and the seal piston ring is placed in the gap by high-pressure fluid. 1. A sealing device for a high-pressure container, characterized in that a structure is formed with a communication hole for introducing a pressure medium for moving in an axial direction to expand a packing member.