JP3101366B2 - High temperature high pressure steam pressure vessel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure vessel installed in a pipe of a high-temperature and high-pressure steam system, and more particularly to a steam seal structure of a lid.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view of a conventional pressure vessel, and FIG. 6 is a detailed view of FIG. In this pressure vessel, a strainer casing 1 is connected in the middle of the piping of the high-temperature and high-pressure steam system, and a strainer element 2 is housed inside the strainer casing 1. The steam flows in the direction of the arrow P, and the impurities in the steam are removed by the strainer element 2 and flows out in the direction of the arrow Q. One end of the strainer element 2 has a lid 4 via an element holding portion 3.
To be accommodated in the strainer casing 1, the element insertion opening 5 of the strainer casing 1
A ring-shaped graphite packing 6 having a wedge-shaped cross section is inserted as a steam seal packing into a gap between the inner peripheral wall surface of the element insertion opening 5 and the outer periphery of the lid 4.
The graphite packing 6 is engaged with a ring groove 9 provided on the inner peripheral wall surface of the element insertion port 5 by a segment ring 8 via a holding ring 7 having a ring shape of the same diameter.
A plurality of stud bolts 10 implanted in the lid 4 are penetrated through the stay ring 11, and nuts 12 are screwed and fastened to fix the segment ring 8 with the stay ring 11.

[0003]

In the conventional steam seal structure, stress concentrates on the wedge-shaped portion of the graphite packing due to the steam pressure, so that the adhesion to the inner peripheral wall of the lid and the element insertion opening is improved, and the steam sealing function is good. However, there has been a problem that the graphite material is oxidized by oxygen to cause a heat loss, and the steam sealing function is deteriorated over time and the steam leaks. In addition, if the packing whose cross-sectional shape described above is wedge-shaped is formed of an integral metal material,
Since the contact surface on the other side (the lid and the inner peripheral wall of the element insertion opening) is damaged and the steam sealing function is deteriorated, the metal packing must be coated with a soft metal (eg, silver), thereby increasing the manufacturing cost. There is.

[0004] In view of the above problems, an object of the present invention is to provide
It is an object of the present invention to provide a steam seal structure for preventing steam leakage due to aging of a packing material.

[0005]

According to the present invention, a strainer element is incorporated in a strainer casing installed in a pipe of a high-temperature and high-pressure steam system, and an element insertion port of the strainer casing is closed with a lid via a steam seal packing. in the pressure vessel, wherein a vapor seal packing, a ring-shaped graphite gasket longitudinal sectional shape with a wedge-shaped, the graphene stainless steel wire knit knitting
And Fight packing wedge stainless wire entangling body formed in a ring shape to fit the wedge Katachiitadaki portion ring dimensions, mica packing longitudinal sectional shape sandwiched between stainless steel plates in two mica sheets were formed in a ring shape an inverted V-shape And a sheet-like stainless steel wire entangled body formed by knitting a stainless steel wire into a ring shape, wherein an inner peripheral wall surface of an element insertion port of the strainer casing and an outer periphery of a lid to which one end of the strainer element is attached are provided. in the gap, a wedge-shaped scan <br/> stainless wire entangling member than the side in contact with the vapor seal packing to steam, graphite packings, mica gasket, inserted in the order of sheet stainless wire entangling member through the pressing ring this segment A ring engages with a ring groove on the inner peripheral wall of the element insertion port and is planted on the end face of the lid. It is inserted into the ring ahead a plurality of stud bolts which are to fix the segment ring by tightening it in this screwed nuts.

[0006]

In the steam packing in which a plurality of packings are combined as described above, the wedge-shaped top of the graphite packing is prevented from being damaged by the presence of the wedge-shaped stainless steel wire entangled body having a cushioning property, and is attached to the lower portion of the graphite packing. The inverted V-shaped mica packing prevents oxygen from entering from the atmosphere side, and prevents the graphite packing from losing heat due to an oxidizing action with oxygen. The mica packing having an inverted V-shaped cross-section is compressed by the presser ring when assembled, and the inner wall surface of the strainer element insertion port and the outer periphery of the strainer element holding portion are caused by the expansion and deformation of the mica packing in the inner and outer radial directions. Adhere completely to the wall. Further, over time, the compressed state is always maintained by the vapor pressure acting on the graphite packing, and the self-sealing sealing characteristic is maintained without forming a gap, thereby preventing invasion of oxygen from the atmosphere side. Further, since the sheet-like stainless steel entangled body is knit-knitted, it does not protrude into the gap between the wall surface of the element insertion opening and the press ring, and the wall surface is not damaged.

[0007]

FIG. 1 is a sectional view of a pressure vessel according to an embodiment of the present invention, FIG. 2 is a detailed view taken in the direction of the arrow A in FIG. 1, and FIG. 3 is a sectional view of a main part for explaining assembly of a steam seal packing. 5 and 6 are the same parts. This embodiment differs from the conventional example in the structure of the steam seal packing. This will be described with reference to FIG. 3. First, a wedge-shaped stainless steel wire entangled body 13 is inserted into a gap between the inner peripheral wall surface of the element insertion port 5 of the strainer casing 1 and the outer periphery of the lid 4. The wedge-shaped stainless wire entangled body 13 is formed by knitting a stainless steel wire and forming it into a ring shape in accordance with the ring size of the wedge-shaped top portion of the graphite packing described later, has cushioning properties, and has a wedge shape of the graphite packing. This protects the top from damage. Subsequently, a ring-shaped graphite packing 6 having a wedge-shaped cross section as shown in FIG. 4 is inserted. Although this insert a graphite packing 6 followed by mica packing 14, the mica packing 14 is intended longitudinal sectional shape sandwiched between stainless steel plates in two mica sheet is formed into a ring is an inverted V-shaped upper surface, a lower surface When the force is applied, the height of the inverted V-shape is reduced and the inner wall surface of the strainer element insertion opening 5 and the outer wall surface of the strainer element holding portion 3 are in close contact. Subsequently, a stainless steel wire entangled body 1 formed by knitting a stainless steel wire into a ring shape
5 is inserted, and the segment ring 8 is engaged with the ring groove 9 provided on the inner peripheral wall surface of the element insertion port 5 of the strainer casing 1 via the holding ring 7. A plurality of the provided stud bolts 10 are inserted through the stay ring 11, and the nut 12 is screwed and tightened to be fixed. In this state, the vertical cross-sectional shape of the mica packing 14 is deformed from an inverted V-shape to a f-shape by receiving a force from below, so that the mica packing 14 comes into close contact with the graphite packing 6 and the sheet-shaped stainless steel wire entangled body 15, and the inner and outer diameters of the mica packing 14 The inner wall surface of the strainer element insertion opening 5 and the outer wall surface of the strainer element holding portion 3 are completely adhered to each other due to the expansion and deformation in the direction.

[0008] The steam seal packing incorporated in this way is completely shut off by the deformation action of the mica packing 14 and oxygen entering from the atmosphere side is not oxidized by the vapor of the graphite packing even in a 570 ° C atmosphere.
Further, the mica packing 14 is always kept in a compressed state by the vapor pressure acting on the graphite packing, so that the swelling in the outer circumferential direction and the inner circumferential direction is also maintained, and the self-sealing property is not lost, and the heat of the graphite packing does not change over time. Weight loss is prevented and no steam leaks.

[0009]

Effects of the Invention Steam seal packing according to this embodiment is a combination with a wedge-shaped stainless steel wire entangling body cushioned, graphite packing, the thickness direction dimension variable mica packing, a sheet-shaped stainless steel wire entangling member even if the heat loss by the graphite packing oxidation since those, also are constantly compressed by the clamping pressure according to the vapor pressure and the pressure ring acting on the graphite packing be shrunk dimension by aging, mica packing or the packing The degree of adhesion between them and the degree of adhesion between each packing and the inner peripheral wall surface of the element insertion port and the outer periphery of the lid are not reduced, and steam does not leak.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pressure vessel according to an embodiment of the present invention.

FIG. 2 is a detailed view of FIG.

FIG. 3 is a sectional view of an essential part for explaining a state in which a steam seal packing is incorporated into an element insertion port.

FIG. 4 is a perspective view of a main part of a graphite packing.

FIG. 5 is a sectional view of a conventional pressure vessel.

FIG. 6 is a detailed view of FIG.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 strainer casing 2 strainer element 4 lid 5 element insertion opening 6 graphite packing 7 holding ring 8 segment ring 9 ring groove 10 stud bolt 11 stay ring 12 nut 13 wedge-shaped stainless wire entangled body 14 mica packing 15 sheet stainless steel entangled body

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Shinokura 541-1 Shimouchi Shinto Ichiba, Sanda City, Hyogo Prefecture Inside the Mita Plant of Nihon Pillar Industry Co., Ltd. (56) References JP-A-63-105202 (JP, A) JP-A-60-220265 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16J 12/00

Claims (2)

(57) [Claims] A pressure vessel in which a strainer element is incorporated in a strainer casing installed in the middle of a pipe of a high-temperature and high-pressure steam system, and an element insertion port of the strainer casing is closed with a lid via a steam seal packing.
As the steam seal packing, a ring-shaped graphite packing having a wedge-shaped vertical cross-sectional shape, and a wedge shape formed by knitting a stainless steel wire and forming the ring shape according to the wedge-shaped top ring dimension of the graphite packing .
A stainless steel wire entangling member, and mica packing longitudinal sectional shape is formed in a ring shape an inverted V-shape to sandwich the stainless steel plate with two mica sheets, sheet-like stainless steel wire formed in a ring shape stainless steel wire knit knitting A wedge-shaped stainless steel wire entangled from the side where the steam seal packing comes into contact with steam in the gap between the inner peripheral wall of the element insertion opening of the strainer casing and the outer circumference of the lid to which one end of the strainer element is attached. Body, graphite packing, mica packing, sheet-like stainless steel wire entangled body, and this is engaged with a ring groove on the inner peripheral wall surface of the element insertion opening by a segment ring via a holding ring. High pressure steam pressure vessel. 2. The segment ring according to claim 1, wherein the segment ring is fixed by inserting a plurality of stud bolts planted on the end face of the lid into the stay ring, screwing a nut therewith, and tightening. A pressure vessel for high-temperature, high-pressure steam, characterized in that: