JP5801008B1 - Double sealed terminal header - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double sealed terminal header adopting a structure that does not generate thermal stress.
In a double-sealed terminal header used in a penetration part of a low-temperature tank for storing liquefied natural gas or the like, a first annular sealing fitting is provided on an inner peripheral surface of a large-diameter hole part 11 of a partition flange 1 One end of the second annular sealing bracket 6 is fixed to a predetermined portion of the first outer diameter portion 21 of the ceramic sleeve 2, and the first annular sealing bracket 5 and the second annular sealing are fixed. The other ends of the metal fitting 6 are fixed, one end of the third annular sealing metal fitting 7 is fixed to the inner peripheral surface of the small diameter hole 12 of the partition flange 1, and the second outer diameter of the small diameter hole 12 of the ceramic sleeve 2 is fixed. The fourth sealing fitting 8 is fixed to a predetermined part of the part, and the other ends of the third sealing fitting and the fourth sealing fitting are fixed.
[Selection] Figure 1

Description

The present invention relates to a double-sealed terminal header used in a penetration part of a low-temperature tank for storing liquefied natural gas and the like, and particularly a double-sealed terminal devised to suppress thermal stress and prevent metal fatigue. It is about the header.

A submerged motor pump is installed inside a low temperature tank for storing a low temperature liquefied gas such as LNG / LPG to send out a low temperature liquefied gas such as LNG / LPG to the outside of the tank. The motor of this submerged motor pump is driven by supplying electric power from the outside of the low temperature tank.

Since the inside of the low-temperature tank and the pump section are in a low-temperature and high-pressure state, it is necessary to prevent problems caused by liquid leakage and low temperature when power is supplied into the low-temperature tank. Conventionally, a double sealed terminal header has been used as a through bushing.
As is well known, this type of double-sealed terminal header is used in a penetrating portion of a low-temperature tank or the like for storing liquefied natural gas such as LNG / LPG. The double-sealed terminal header includes a partition flange that is fixed so as to close the penetrating portion of the tank, a ceramic sleeve that is inserted and fixed in a through hole provided in the partition flange, and a hollow inside the ceramic sleeve. And a conductor inserted through the portion, and a portion that needs to be sealed is sealed with a sealing material.

Japanese Utility Model Publication No. 64-35637 JP-A-8-338596 JP 10-116530 A

  In the conventional double-sealed terminal header, a structure for absorbing the thermal stress generated according to the temperature change is provided. However, in the conventional technique described in Patent Document 1, the thermal stress exceeding the proof stress in the axial direction is provided. However, the conventional technology described in Patent Document 2 attempts to absorb thermal stress by reducing the cross-sectional area of the intermediate portion of the conductor to provide flexibility. Therefore, the flexibility may be lost, and the prior art described in Patent Document 3 uses a bellows structure to absorb thermal stress. It was.

  An object of the present invention is to provide a double-sealed terminal header that eliminates the above disadvantages and employs a structure that does not generate thermal stress.

In order to achieve the above object, a double sealed terminal header according to claim 1 of the present invention is a double sealed terminal header used in a penetration part of a low temperature tank for storing liquefied natural gas or the like. A partition flange that is fixed so as to close the through portion and has a predetermined thickness and has a through hole, and a through hole that is formed in a hollow cylindrical shape and is formed in the partition flange. A double-sealed terminal header comprising a ceramic sleeve and a conductor inserted and fixed in a hollow portion of the ceramic sleeve, wherein a portion that needs to be sealed is sealed with a sealing material,
The through-hole provided in the partition flange has a predetermined first length from the central axis toward the second side face contacting the room temperature and atmospheric pressure side from the first side face contacting the low temperature and high pressure side. A large-diameter hole formed in the radius;
A small diameter formed from the second side surface side to the first side surface side to the large diameter hole portion and having a radius smaller than the radius of the large diameter hole portion and formed from the central axis to the second radius. With holes,
The ceramic sleeve is formed into a hollow cylindrical body having a predetermined length,
The part in contact with the low temperature pressure side is formed with a predetermined length with an outer diameter slightly smaller than the inner diameter of the large-diameter hole portion of the partition flange, and has an outer shape that fits into the large-diameter hole portion of the partition flange with a predetermined gap. 1 outer diameter part,
A second portion having an outer shape that is formed in a predetermined length with a radius slightly smaller than the inner diameter of the small-diameter hole portion of the partition flange, and that fits into the small-diameter hole portion of the partition flange with a predetermined gap. An outer diameter portion,
The ceramic sleeve is fitted in the through hole of the partition flange,
Fixing one end of the first sealing fitting at a predetermined position on the inner peripheral surface of the large-diameter hole of the partition flange;
One end of the second sealing fitting is fixed at a predetermined position of the first outer diameter portion of the ceramic sleeve, and the other end of the first sealing fitting and the other ends of the second sealing fitting are fixed. And
One end of the third sealing fitting is fixed to a predetermined position on the inner peripheral surface of the small-diameter hole of the partition flange, and a fourth sealing fitting is fixed to a predetermined position on the second outer diameter portion of the ceramic sleeve. ,
The other end of the third sealing bracket and the other end of the fourth sealing bracket are fixed to each other.

A double-sealed terminal bedder according to a second aspect of the present invention is the double-sealed terminal bedder according to the first aspect, wherein the first annular sealing metal fitting has an outer peripheral surface at an inner peripheral surface of a large-diameter hole portion of a partition flange. The second annular sealing metal fitting is fixed at its inner peripheral surface at one end to a second recess provided in the ceramic sleeve, and the other annular inner surface of the first annular sealing metal fitting and the second annular sealing metal fitting. The outer peripheral surface of the other end of the sealing fitting is fixed at the boundary position between the large diameter hole portion and the small diameter hole portion of the first recess,
One end outer peripheral surface of the third annular sealing bracket is fixed to the inner peripheral surface of the small-diameter hole portion of the partition flange, and the fourth annular sealing bracket is one end inner peripheral surface of the convex portion provided on the ceramic sleeve. The other end inner peripheral surface of the third annular sealing bracket and the other end outer peripheral surface of the fourth annular sealing bracket are formed between the large-diameter hole portion and the small-diameter hole portion on the low-temperature pressure side from the convex portion. It is characterized by being fixed at the boundary position.

  A double-sealed terminal bedder according to a third aspect of the present invention is the double-sealed terminal bedding according to the first or second aspect, wherein the first sealing metal fitting and the third sealing metal fitting have a coefficient of thermal expansion of the partition flange. It is characterized by being made of a material having a thermal expansion coefficient that is substantially the same or within a certain range with respect to the thermal expansion coefficient of the partition flange.

  According to a fourth aspect of the present invention, there is provided the double-sealed terminal bedder according to the first or second aspect, wherein the second sealing metal fitting and the fourth sealing metal fitting are substantially equal to a thermal expansion coefficient of the ceramic sleeve. It is the same or is made of a material having a thermal expansion coefficient within a certain range with respect to the thermal expansion coefficient of the ceramic sleeve.

  According to the present invention, a through hole including a large diameter hole portion and a small diameter hole portion is formed in the partition flange, and a ceramic sleeve is formed in the first outer diameter portion and the second outer diameter portion. The large-diameter hole portion has a second outer diameter portion fitted into the small-diameter hole portion with a certain gap, and a structure having a predetermined shape is provided at the boundary between the first outer diameter portion and the second outer diameter portion. The first outer diameter portion of the partition flange and the large diameter hole portion of the ceramic sleeve are fixed by the first sealing fitting and the second sealing fitting, and the second outer diameter portion of the partition flange and the small diameter hole of the ceramic sleeve are fixed. Since the portion is fixed by the third sealing metal fitting and the fourth sealing metal fitting, thermal stress can be absorbed by this structure, so that it goes in the axial direction of the partition flange, ceramic sleeve, conductor, etc. There is an excellent effect that no thermal stress is generated and metal fatigue is not caused.

It is sectional drawing which shows an example of embodiment of the double sealing type | mold terminal header which concerns on this invention. It is sectional drawing which expands and shows the center part of the double sealing type | mold terminal header which concerns on this invention. It is sectional drawing which expands and shows the low-temperature-pressure side edge parts, such as a ceramic sleeve, of the double sealing type terminal header which concerns on this invention. It is sectional drawing which expands and shows the normal temperature atmospheric pressure side edge parts, such as a ceramic sleeve, of the double sealing type terminal header which concerns on this invention. It is sectional drawing which shows the partition flange which is a partial component of the double sealing type | mold terminal header which concerns on this invention. It is sectional drawing which shows the ceramic sleeve which is a partial component of the double sealing type | mold terminal header which concerns on this invention. It is sectional drawing which expands and shows the other structural example of low temperature pressure side edge parts, such as a ceramic sleeve of the double sealing type | mold terminal header which concerns on this invention. It is sectional drawing which expands and shows the other structural example of normal temperature atmospheric pressure side edge parts, such as a ceramic sleeve of the double sealing type | mold terminal header which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1, FIG. 2, FIG. 5 and FIG. 6, the embodiment of the double sealed terminal header TH according to the present invention is also used for a penetrating portion of a low temperature tank or the like for storing liquefied natural gas such as LNG / LPG. It is what

  This double sealed terminal header TH includes a partition flange 1, a ceramic sleeve 2, an annular long sealing tube 3, a center conductor 4, a first annular sealing metal fitting 5, and a second annular sealing. A fitting 6, a third annular sealing fitting 7, a fourth annular sealing fitting 8, an annular short sealing tube 9, and terminals Pa and Pb are provided, and a portion requiring sealing is sealed. It is formed by sealing with a material.

Furthermore, each component of the double-sealed terminal header TH will be described in detail with reference to FIGS. 1, 2, 5, and 6. FIG.
The partition flange 1 is configured as follows. That is, the partition flange 1 is configured by a plate body having a predetermined thickness (La + Lb) made of, for example, SUS316L, and a through hole 10 is formed in the plate body. The through hole 10 formed in the partition flange 1 includes a large diameter hole portion 11 and a small diameter hole portion 12.

The large-diameter hole portion 11 has a predetermined first length from the first side surface Sa side of the partition wall flange 1 in contact with the low temperature and high pressure side toward the second side surface Sb side of the partition wall flange 1 in contact with the room temperature and atmospheric pressure side. Over the length La, the first radius Ra is drilled from the central axis O.
The small-diameter hole portion 12 extends from the radius Ra of the large-diameter hole portion 11 over a second length Lb from the second side surface Sb side to the first side surface Sa side to the large-diameter hole portion 11. A small radius is drilled from the central axis O while maintaining the second radius Rb.

  Next, the ceramic sleeve 2 is configured as follows. That is, the ceramic sleeve 2 is made of a ceramic insulator made of, for example, HA-92, and is a hollow cylindrical body having a predetermined length Lc. It is formed into a shape.

The thick cylindrical portion 21 is formed to have a predetermined length Ld with an outer diameter Rc slightly smaller than the inner diameter Ra of the large-diameter hole portion 11 of the partition flange 1 at a portion in contact with the low-temperature pressure side. 11 is formed in an outer shape that can be fitted with a predetermined gap Da.

  The narrow cylindrical portion 22 is formed to have a predetermined length Le with a radius Rd slightly smaller than the inner diameter of the small-diameter hole portion 12 of the partition flange 1 at a portion in contact with the room temperature and atmospheric pressure side. It is formed in an outer shape that can be fitted with a predetermined gap Db.

The ceramic sleeve 2 is configured in a predetermined shape on both sides of the boundary F between the thick cylindrical portion 21 and the thin cylindrical portion 22.

  A predetermined radius Re from the boundary F between the thick cylindrical portion 21 and the thin cylindrical portion 22 of the ceramic sleeve 2 on the low temperature pressure side and to the outer peripheral portion of the ceramic sleeve 2 toward the low temperature pressure side. Thus, the first recess 23 is formed. Further, the first concave portion is formed on the outer peripheral portion of the ceramic sleeve 2 on the left side of the first concave portion 23 on the low temperature pressure side from the boundary F between the thick cylindrical portion 21 and the thin cylindrical portion 22 of the ceramic sleeve 2. A second recess 24 is formed which has a radius Rf larger than the radius Re of 23 and smaller than the outer diameter Rc.

  Further, the ceramic sleeve 2 is located at a predetermined position on the normal temperature and atmospheric pressure side at a predetermined position on the normal temperature and atmospheric pressure side from the boundary F between the thick cylindrical portion 21 and the thin cylindrical portion 22. A convex portion 25 having a radius Rg larger than the radius Rd of the thin cylindrical portion 22 and smaller than the radius Rb of the small-diameter hole portion 12 of the partition flange 1 is formed.

  In the partition flange 1, at the boundary portion between the large-diameter hole portion 11 and the small-diameter hole portion 12, the semicircular shape as illustrated from the boundary portion on the large-diameter hole portion 11 side toward the room temperature and atmospheric pressure side. A space 13 is formed. Further, in the ceramic sleeve 2, at the boundary F portion between the thick cylindrical portion 21 and the thin cylindrical portion 22, as shown in the drawing, from the position of the boundary F on the thin cylindrical portion 22 side toward the low-temperature pressure side. A space 20 is formed in a circular shape.

  And the large cylindrical part 21 of the said ceramic sleeve 2 is arrange | positioned as shown in FIG.1 and FIG.2 in the large diameter hole part 11 of the said partition flange 1, and naturally the small diameter of the said partition flange 1 by the arrangement | positioning. In the hole 12, the narrow cylindrical portion 22 of the ceramic sleeve 2 is arranged as shown in FIGS.

When the partition flange 1 and the ceramic sleeve 2 are arranged as shown in FIGS. 1 and 2, the large-diameter hole portion 11 of the partition flange 1 and the thick cylindrical portion 21 of the ceramic sleeve 2 are in a first annular shape. The connection by the sealing metal fitting 5 and the second annular sealing metal fitting 6 will be described.

  That is, one end of the first annular sealing metal fitting 5 is fixed to the inner peripheral surface of the large-diameter hole portion 11 of the partition flange 1. An inner peripheral surface of one end of the second annular sealing metal fitting 6 is fixed to a predetermined portion of the first outer diameter portion 21 of the ceramic sleeve 2. Further, the first annular sealing metal fitting 5 and the second annular sealing metal fitting 6 are fixed at the other ends thereof, so that the large-diameter hole portion 11 of the partition flange 1 and the ceramic sleeve 2 are thick. The cylindrical part 21 is connected.

  More specifically, one end side outer peripheral surface of the first annular sealing metal fitting 5 is fixed to the inner peripheral surface of the large-diameter hole portion 11 of the partition flange 1 by, for example, TIG welding. The inner peripheral surface of one end side of the second annular sealing metal fitting 6 is fixed to the flat surface of the second concave portion 24 which is a predetermined portion of the thick cylindrical portion 21 of the ceramic sleeve 2 by, for example, brazing. On the inner circumferential surface of the first annular sealing bracket 5, the outer circumferential surface on the other end side of the second annular sealing bracket 6 is fixed at the position of the boundary F of the space 13 by, for example, TIG welding.

  The first annular sealing metal fitting 5 is made of, for example, SUS316L, and is substantially the same as the thermal expansion coefficient of the partition flange 1 or a material having a thermal expansion coefficient within a certain range with respect to the thermal expansion coefficient of the partition flange 1. May be configured. Further, the second annular sealing metal fitting 6 is made of, for example, Kovar, and is approximately the same as the thermal expansion coefficient of the ceramic sleeve 2 or within a certain range with respect to the thermal expansion coefficient of the ceramic sleeve. What is necessary is just to comprise from this material.

Furthermore, when the partition flange 1 and the ceramic sleeve 2 are arranged as shown in FIGS. 1 and 2, the small-diameter hole portion 12 of the partition flange 1 and the narrow cylindrical portion 22 of the ceramic sleeve 2 are 3 is connected by the fourth annular sealing bracket 7 and the fourth annular sealing bracket 8.

  That is, one end of the third annular sealing fitting 7 is fixed to the inner peripheral surface of the small diameter hole 12 of the partition flange 1. A fourth annular sealing fitting 8 is fixed to a predetermined portion of the second outer diameter portion of the small diameter hole portion 12 of the ceramic sleeve 2. Then, the other ends of the third annular sealing metal fitting 7 and the fourth annular sealing metal fitting 8 are fixed to each other, so that the small diameter hole portion 12 of the partition wall flange 1 and the thin cylinder of the ceramic sleeve 2 are provided. The part 22 is connected.

  More specifically, the outer peripheral surface of one end side of the third annular sealing metal fitting 7 is fixed to the inner peripheral surface of the small-diameter hole portion 12 of the partition flange 1 by, for example, TIG welding. On the flat surface of the convex portion 25 as a predetermined portion of the thin cylindrical portion 22 of the ceramic sleeve 2, the one end side inner peripheral surface of the fourth annular sealing metal fitting 8 is fixed by brazing, for example. On the inner peripheral surface of the third annular sealing bracket 7, the outer peripheral surface on the other end side of the fourth annular sealing bracket 8 is fixed at the position of the boundary F of the space 20 by, for example, TIG welding.

  The third annular sealing bracket 7 is made of, for example, SUS316L and has a thermal expansion coefficient that is substantially the same as the thermal expansion coefficient of the partition flange 1 or within a certain range with respect to the thermal expansion coefficient of the partition flange 1. What is necessary is just to comprise from a material. The fourth annular sealing bracket 8 is made of, for example, Kovar, and has a thermal expansion coefficient that is substantially the same as the thermal expansion coefficient of the ceramic sleeve 2 or within a certain range with respect to the thermal expansion coefficient of the ceramic sleeve 2. What is necessary is just to comprise from a material.

  Next, the relationship between the ceramic sleeve 2, the annular long sealing tube 3 and the center conductor 4 will be described with reference to FIGS. 1, 3 and 4.

  The ceramic sleeve 2 is formed into a hollow cylindrical body. The ceramic sleeve 2 having a hollow cylindrical shape is provided with a through hole 26. As shown in FIGS. 1 and 3, an annular groove 27 having a predetermined depth in the axial direction and a predetermined width in the radial direction is provided at an end portion of the through hole 26 of the ceramic sleeve 2 on the low-temperature pressure side.

  In the through hole 26 of the ceramic sleeve 2, an annular long sealing tube 3 formed to a predetermined length Li is fitted with no gap. The annular long sealing tube 3 is formed with an annular flange 31 that fits in the annular groove 27 of the ceramic sleeve 2 without a gap. The annular flange 31 of the annular long sealed tube 3 is fixed by, for example, brazing in a state of fitting in the annular groove 27 of the ceramic sleeve 2.

  The central conductor 4 is formed in a cylindrical shape, and is formed so as to be housed in the through hole of the annular long sealed tube 3 and the through hole 26 of the ceramic sleeve 2. The central conductor 4 has a first convex portion 41 on the low temperature pressure side and in contact with the inner peripheral surface of the annular long sealing tube 3 at a certain length near the annular flange 31 of the annular long sealing tube 3. Is formed. The first convex portion 41 is in contact with the annular flange 31 of the annular long sealed tube 3 with a predetermined gap, but is not sealed.

  Further, the center conductor 4 is formed with a second convex portion 42 that is in contact with the inner peripheral surface of the annular long sealing tube 3 at a constant length Lj on the end side of the annular long sealing tube 3. . Further, the central conductor 4 is formed with a convex portion 43 having a constant length Lk from the end of the annular long sealed tube 3 toward the room temperature and atmospheric pressure side. Here, the convex portion 43 is referred to as a third convex portion. Furthermore, a stepped portion 43 a that fits to the inner peripheral surface of the annular short sealed tube 9 is formed at the end of the convex portion 43 on the room temperature and atmospheric pressure side.

  As shown in FIGS. 1, 3 and 4, the central conductor 4 is formed between the first convex portion 41 and the second convex portion 42, and between the second convex portion 42 and the third convex portion 42. Between the convex portions 43, the radius is smaller than the radius of each convex portion. As described above, the third convex portion 43 is formed with the step portion 43a on the normal temperature and atmospheric pressure side.

  Then, as shown in FIG. 4, an annular short sealing tube 9 is fitted into the step 43a on the room temperature atmospheric pressure side of the third convex portion 43 of the central conductor 4, and the annular short sealing tube 9 and the ceramic sleeve 2 are fixed by, for example, brazing or welding, and the annular short sealed tube 9 and the center conductor 4 are fixed by, for example, brazing.

  Further, a terminal attachment portion 45a is formed at the end of the central conductor 4 on the low temperature pressure side, and a terminal Pa is attached to the terminal attachment portion 45a. Similarly, a terminal mounting portion 45b is formed at an end of the central conductor 4 on the room temperature and atmospheric pressure side, and a terminal Pb is mounted on the terminal mounting portion 45b.

  The double-sealed terminal header configured in this way includes a first annular sealing metal fitting 5 fixed to the inner peripheral surface of the large-diameter hole 11 of the partition flange 1 and a second of the ceramic sleeve 2. The second annular sealing metal fitting 6 fixed to the outer peripheral surface of the recess 24 is fixed at the position of the boundary F of the space 13 and further fixed to the inner peripheral surface of the small-diameter hole portion 12 of the partition flange 1. A structure in which the third annular sealing bracket 7 and the fourth annular sealing bracket 8 fixed to the outer peripheral surface of the convex portion 25 of the ceramic sleeve 2 are fixed at the position of the boundary F of the space 20. doing.

  Further, the first annular sealing metal fitting 5 and the third annular sealing metal fitting 7 have substantially the same thermal expansion coefficient as that of the partition flange 1 or a heat within a certain range with respect to the thermal expansion coefficient of the partition flange 1. It is composed of a material having an expansion coefficient. In addition, the second annular sealing metal fitting 6 and the fourth annular sealing metal fitting 8 are substantially the same as the thermal expansion coefficient of the ceramic sleeve 2 or within a certain range with respect to the thermal expansion coefficient of the ceramic sleeve. It is comprised from the material of the thermal expansion coefficient of.

  Therefore, since the embodiment according to the present invention described above has a structure constituted by the material, the thermal stress in the axial direction of the central conductor and the like is absorbed by the structure, so that the partition flange, the ceramic sleeve, and the No thermal stress is generated in the axial direction of the conductor or the like, metal fatigue does not occur, and there is an excellent advantage that it can withstand long-term use without failure.

  Furthermore, since the embodiment according to the present invention described above has a structure constituted by the above material, the force applied from the low temperature and high pressure side to the normal temperature and atmospheric pressure side applied to the ceramic sleeve 2 is the thick cylinder of the ceramic sleeve 2. Since the end of the portion 21 is pressed against the partition wall of the large-diameter hole portion 11 of the partition flange 1, an accident that the ceramic sleeve 2 comes off from the partition flange 1 does not occur.

  In the above-described embodiment according to the present invention, the annular long sealing tube 3 is inserted and fixed in the through hole 26 of the ceramic sleeve 2, and the annular long sealing tube 3 is formed by the annular flange 31. The ceramic sleeve 2 is fixed in close contact with the annular groove 27. Further, the central conductor 4 is in non-fixed contact with the annular long sealed tube 3 at the first convex portion 41, and the second convex portion 42 is formed on the inner peripheral surface of the annular long sealed tube 3, for example. It is fixed by brazing. And the said center conductor 4 inserts the cyclic | annular short sealing pipe | tube 9 in the step part 43a provided in the normal temperature atmospheric pressure side of the 3rd convex-shaped part 43, and cyclic | annular short sealing pipe | tube 9 and the central conductor 4 are cyclic | annular. The short sealing tube 9 and the ceramic sleeve 2 are fixed by brazing.

  Therefore, in the embodiment of the present invention, since the ceramic sleeve 2, the annular long sealed tube 3 and the center conductor 4 have the above-described structure, the thickness in the diameter direction can be reduced, and the diameter direction The thermal stress generated can be reduced and less than the proof stress of each material. Therefore, there is an advantage that it is possible to provide a double sealed terminal header that does not cause a failure or the like.

FIG. 7 is an enlarged cross-sectional view showing a part of another configuration example of the low temperature pressure side end portion such as the ceramic sleeve of the double sealed terminal header according to the present invention. In FIG. 7, there is a feature only in another configuration example portion of the low temperature pressure side end portion such as a ceramic sleeve, and the other configurations are not changed. Therefore, the same reference numerals as those in the above embodiment are given, and description thereof is omitted. To do. In addition, since this embodiment appears symmetrically with respect to the central axis O, only one cross section will be shown and described.

In FIG. 7, between the outer periphery of the annular flange 31 of the annular long sealing tube 3 and the inner peripheral surface of the annular groove 27 of the ceramic sleeve 2, as shown in FIG. Is intervening. And the said annular collar part 31 and the cyclic | annular metal fitting C55 are welded as shown by the code | symbol Y in FIG. 7, and the internal peripheral surface of the annular groove 27 and the outer peripheral surface of the cyclic | annular sealing metal fitting C55 are code | symbol in FIG. As shown by J, it is fixed with brazing.

FIG. 8 is an enlarged cross-sectional view showing a part of another configuration example of the end portion at the normal temperature and atmospheric pressure side such as the ceramic sleeve of the double sealed terminal header according to the present invention. In FIG. 8, there is a feature only in the other configuration example portion of the normal temperature and atmospheric pressure side end portion such as a ceramic sleeve, and the other configuration is not changed. Omitted. In addition, since this embodiment appears symmetrically with respect to the central axis O, only one cross section will be shown and described.

In FIG. 8, the center conductor 4 is fitted with a circular short sealing tube 9a having a length as shown in FIG. 8 in a step portion 43a provided on the normal temperature and atmospheric pressure side of the third convex portion 43. An annular sealing tube C57 having a length as shown in FIG. 8 is fitted on the outer periphery of the short sealing tube 9a. Between the annular short sealed tube 9a and the step 43a in the third convex portion 43 of the central conductor 4, and between the outer periphery of the annular sealed tube C57 and the inner periphery of the ceramic sleeve 2. 8 are fixed by brazing as indicated by the symbol J in FIG. Further, the annular short sealed tube 9a and the annular sealed tube C57 are welded as indicated by a symbol Y in FIG.

7 and 8 as described above, the thickness in the diametrical direction can be reduced, so that the thermal stress generated in the diametrical direction can be reduced, the proof stress of each material can be reduced, and no failure occurs. A double-sealed terminal header with advantages can be provided.

DESCRIPTION OF SYMBOLS 1 Bulkhead flange 2 Ceramic sleeve 3 Annular long sealing tube 4 Center conductor 5 First annular sealing bracket 6 Second annular sealing bracket 7 Third annular sealing bracket 8 Fourth annular sealing bracket 9 Annular Short sealed tube 9a Annular short sealed tube 11 Large diameter hole 12 Small diameter hole
13 space 20 space 21 thick cylindrical portion 22 thin cylindrical portion 23 first concave portion 24 second concave portion 25 convex portion 26 through hole 31 annular flange portion 41 first convex portion 42 second convex portion 43 third Convex part 43a Stepped part C55, C57 Annular sealing metal fittings

Claims (4)

A double-sealed terminal header used in a penetration part of a low-temperature tank for storing liquefied natural gas or the like, which is fixed so as to close the penetration part and has a predetermined thickness and has a through-hole. Sealing is required, including a flange, a ceramic sleeve formed in a hollow cylindrical shape and inserted and fixed in a through hole formed in the partition flange, and a conductor inserted and fixed in the hollow portion of the ceramic sleeve In double-sealed terminal headers, which are formed by sealing various parts with a sealing material,
The through hole provided in the partition flange is
A large-diameter hole drilled from the central axis to the first radius with a predetermined first length from the first side surface in contact with the low temperature and high pressure side toward the second side surface in contact with the room temperature and atmospheric pressure side And
A small diameter formed from the second side surface side to the first side surface side to the large diameter hole portion and having a radius smaller than the radius of the large diameter hole portion and formed from the central axis to the second radius. With holes,
The ceramic sleeve is formed into a hollow cylindrical body having a predetermined length,
The part in contact with the low temperature pressure side is formed with a predetermined length with an outer diameter slightly smaller than the inner diameter of the large-diameter hole portion of the partition flange, and has an outer shape that fits into the large-diameter hole portion of the partition flange with a predetermined gap. 1 outer diameter part,
A second portion having an outer shape that is formed in a predetermined length with a radius slightly smaller than the inner diameter of the small-diameter hole portion of the partition flange, and that fits into the small-diameter hole portion of the partition flange with a predetermined gap. An outer diameter portion,
The ceramic sleeve is fitted in the through hole of the partition flange,
Fixing one end of the first sealing fitting at a predetermined position on the inner peripheral surface of the large-diameter hole of the partition flange;
Fixing one end of the second sealing fitting to a predetermined position of the first outer diameter portion of the ceramic sleeve, and fixing the other end of the first sealing fitting and the other end of the second sealing fitting; Become
One end of the third sealing fitting is fixed to a predetermined position on the inner peripheral surface of the small-diameter hole of the partition flange, and a fourth sealing fitting is fixed to a predetermined position on the second outer diameter portion of the ceramic sleeve. ,
A double-sealed terminal header, wherein the other end of the third sealing bracket and the other end of the fourth sealing bracket are fixed. One end outer peripheral surface of the first annular sealing metal fitting is fixed to the inner peripheral surface of the large-diameter hole portion of the partition flange, and the second annular sealing metal fitting is inserted into a second recess provided in the ceramic sleeve. The peripheral surface is fixed, and the other end inner peripheral surface of the first annular sealing bracket 5 and the other end outer peripheral surface of the second annular sealing bracket 6 are the large-diameter hole portion and the small-diameter hole portion of the first recess. Is fixed at the boundary position of
One end outer peripheral surface of the third annular sealing bracket is fixed to the inner peripheral surface of the small-diameter hole portion of the partition flange, and the fourth annular sealing bracket is one end inner peripheral surface of the convex portion provided on the ceramic sleeve. The other end inner peripheral surface of the third annular sealing bracket and the other end outer peripheral surface of the fourth annular sealing bracket are formed between the large-diameter hole portion and the small-diameter hole portion on the low-temperature pressure side from the convex portion. 2. The double sealed terminal header according to claim 1, wherein the double sealed terminal header is fixed at a boundary position.   The first sealing metal fitting and the third sealing metal fitting are made of a material having a thermal expansion coefficient that is substantially the same as the thermal expansion coefficient of the partition flange or within a certain range with respect to the thermal expansion coefficient of the partition flange. The double-sealed terminal header according to claim 1 or 2, characterized in that: The second sealing metal fitting and the fourth sealing metal fitting are made of a material having a thermal expansion coefficient that is substantially the same as the thermal expansion coefficient of the ceramic sleeve or within a certain range with respect to the thermal expansion coefficient of the ceramic sleeve. The double-sealed terminal header according to claim 1 or 2, characterized in that:

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