JP2016112531A - Coupling body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coupling body which can be made compact and ensure high sealability.SOLUTION: In a coupling body 9, a cylindrical first coupling member 23 and a cylindrical second coupling member 25 are coupled, and an internal flow passage 21 is formed by through holes of both coupling members 23, 25. The first coupling member 23 and the second coupling member 25 are coupled by engaging (screwing) a female screw of the first coupling member 23 and a male screw of the second coupling member 25. An annular seal member 19 is arranged at a gap 28 between the first coupling member 23 and the second coupling member 25 in an axial direction so as to surround an outer peripheral side of a tip part 39 of the second coupling member 25. The thermal expansion coefficient of the first coupling member 23 is smaller than the thermal expansion coefficient of the second coupling member 25 and the seal member 19.SELECTED DRAWING: Figure 2

Description

  The present invention provides, for example, a hydrogen separator, an oxygen separator, a carbon dioxide separator, a water (steam) filter, an oil that can obtain high-purity hydrogen gas by selecting and separating the hydrogen gas from the source gas. The present invention relates to a combined body that can be applied to a fluid separation device such as a filter that can separate a predetermined fluid (for example, gas or liquid) from a raw material fluid (for example, gas or liquid). The present invention is also applied to solid oxide fuel cells, iron-air cells, and the like that involve chemical reaction and separation.

  Conventionally, for example, in order to produce hydrogen to be supplied to a fuel cell, a hydrogen separator that selectively extracts only hydrogen from a gas containing hydrogen such as steam reformed gas has been developed. Various hydrogen separators housed in the plant have been developed.

The hydrogen separator is obtained by forming a hydrogen permeable membrane (hereinafter referred to as a hydrogen separation metal layer) made of palladium (Pd) or the like, for example, on the surface of a cylindrical ceramic porous substrate.
Moreover, as a technique for separating the gas described above, for example, a gas separation device is produced by forming a gas separation membrane on the surface of a cylindrical substrate having a through hole, and a gas separation device using the gas separation member is disclosed. (See Patent Document 1).

  In this gas separation device, a lid-like metal member is compression-fixed to one opening end of the gas separator via a seal member, and an annular metal member is compression-fixed to the other opening end via a seal member. ing. In addition, the lid-like metal member includes a lid-like or annular packing presser that applies a clamping pressure in the axial direction of the cylindrical base to one gland packing, and a lower annular or lower part that suppresses the movement of one gland packing. It is composed of a lid-like stopper. Furthermore, the annular metal member is configured by an annular packing presser that applies a clamping pressure in the axial direction of the cylindrical base to the other gland packing, and an upper annular stopper that suppresses the movement of the other gland packing. .

JP 2003-126662 A

However, in the above-described prior art, the number of parts of the device is large, and the outer diameter of the fixed structure portion is larger than that of the gas separator, so that it is not easy to make the device compact.
Further, an apparatus for separating this kind of fluid requires high sealing performance (airtightness or watertightness), but further improvement has been demanded.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a combined body that can make the apparatus compact and can ensure high sealing performance.

  (1) In the joined body of the first aspect of the present invention, the tubular first joining member and the tubular second joining member are joined, and at least a part of the internal flow path is formed by the through holes of the both joining members. In the cylindrical coupling body in which a fluid having a temperature of 200 ° C. or higher may flow in the internal flow path, a female screw is formed in the first coupling member, and the second coupling member A male screw is formed, and the first coupling member and the second coupling member are coupled by engagement of the female screw and the male screw, and the first coupling member and the second coupling member There is a gap in the axial direction at a part of the gap, and an annular seal member is disposed in the gap so as to surround the outer peripheral side of the portion having the through hole of the second coupling member. The thermal expansion coefficient of the coupling member is the thermal expansion of the second coupling member and the sealing member. And it is smaller than the number.

  The combined body of the first aspect includes a cylindrical first coupling member and a cylindrical second coupling member coupled to each other, and at least an internal flow path by a through-hole (formed inside the cylinder) of both coupling members. A fluid having a temperature of 200 ° C. or higher may flow through the internal flow path. That is, the bonded body may be used not only at room temperature (for example, 25 ° C.) but also at a high temperature of 200 ° C. or higher.

  Moreover, in this 1st aspect, the 1st coupling member and the 2nd coupling member couple | bond together, when the internal thread of the 1st coupling member and the external thread of the 2nd coupling member engage (screw coupling: screwing). Has been. Further, there is a gap in the axial direction at a part between the first coupling member and the second coupling member, and a portion having a through hole (and hence an internal flow path) of the second coupling member in this gap. An annular seal member is disposed so as to surround the outer peripheral side of the.

  With this configuration, the combined body in which the first connecting member and the second connecting member are combined can be made compact. In addition, the number of parts of various devices (for example, a fluid separation device) using this combined body is small, and the entire device is not larger than the outer diameter of the first coupling member in which the fluid separation portion is formed. It can be made compact.

  Further, in the first aspect, the thermal expansion coefficient of the first coupling member is smaller than the thermal expansion coefficients of the second coupling member and the seal member. Therefore, a fluid having a high temperature of 200 ° C. or more flows through the internal flow path, and therefore, only the expansion of the thermal expansion in the axial direction of the second coupling member and the expansion of the thermal expansion of the seal member are related to the sealing performance. Since it is not affected by one coupling member, there is a remarkable effect that the sealing performance is high.

  Furthermore, if the thermal expansion coefficients of the first coupling member and the second coupling member are smaller than the thermal expansion coefficient of the seal member, for example, even if the seal member tries to expand when the temperature rises, Since there is little change in the dimension of the gap between the connecting member and the second connecting member (change in which the interval becomes wider), the seal member may be plastically deformed. In this case, when the temperature is lowered, the seal member becomes small, but since the shape is changed due to plastic deformation, the sealability may be lowered.

  In contrast, in the first aspect, when the seal member expands when the temperature rises, the gap between the first coupling member and the second coupling member (having a larger coefficient of thermal expansion than the first coupling member) also widens. Therefore, the seal member is difficult to be plastically deformed. Therefore, even if the temperature decreases and the sealing member becomes small, high sealing performance can be ensured.

  As described above, in the first aspect, the combined body can be made compact as compared with the conventional case, and even when there is a temperature change, there is a remarkable effect that high sealing performance (airtightness, watertightness) can be secured. .

  The first coupling member and the second coupling member can be coupled with their axial directions aligned. In particular, it is desirable that the two members be coupled coaxially, but it is preferable if they are substantially coaxial. For example, as long as the effects of the present invention are not impaired, both members may be parallel and the centers of the axes may be slightly shifted. As the range of the deviation, for example, the minimum thickness in the maximum diameter portion of the first coupling member (that is, the minimum thickness of the portion where the second coupling member is screw-coupled in the maximum diameter portion) is the first coupling member. It is desirable to be at least three times the dimensional difference between the thread valley and the thread. This also applies to the following third aspect.

  (2) In the joined body according to the second aspect of the present invention, one end of the second joining member is fitted into the through hole of the first joining member, and the female is placed on the inner peripheral surface of the through hole of the first joining member. A screw is formed, and the male screw is formed on the outer peripheral surface of one end of the second coupling member.

  With this configuration, for example, a joined body can be easily formed by screwing one end of the second coupling member into the through hole of the first coupling member. Further, this configuration makes it possible to form an internal flow path having a large inner diameter.

  (3) In the joined body of the third aspect of the present invention, the tubular first joining member and the tubular second joining member are joined, and at least a part of the internal flow path is formed by the through holes of both the joining members. In the cylindrical coupling body in which a fluid having a temperature of 200 ° C. or more may flow in the internal flow path, the first coupling member or the intermediate member engaged with the first coupling member is female. A screw is formed, and a screw member having a male screw is disposed on the second coupling member, and the screw member penetrates the second coupling member in the axial direction and engages with the second coupling member. The first coupling member and the second coupling member are coupled by engagement of the female screw and the male screw, and the shaft of the first coupling member and the second coupling member Ring so that it surrounds the outer periphery of the internal flow path. Sealing member is disposed, and further, the thermal expansion coefficient of the first coupling member may be smaller than the thermal expansion coefficient of the screw member and the sealing member.

  The coupling body of the third aspect is formed by coupling the cylindrical first coupling member and the cylindrical second coupling member, and at least the internal flow path by the through holes (formed inside the cylinder) of both coupling members. A fluid having a temperature of 200 ° C. or higher may flow through the internal flow path. That is, the bonded body may be used not only at room temperature (for example, 25 ° C.) but also at a high temperature of 200 ° C. or higher.

  Further, in the third aspect, a female screw is formed on the first coupling member or an intermediate member that engages with the first coupling member, and a screw member having a male screw is disposed on the second coupling member, The screw member is disposed so as to penetrate the second coupling member in the axial direction and engage with the second coupling member. And a 1st coupling member and a 2nd coupling member are couple | bonded when a female screw and a male screw engage (screw coupling | bonding: screwing). Further, an annular seal member is arranged in the axial gap between the first coupling member and the second coupling member so as to surround the outer peripheral side of the internal flow path.

  With this configuration, the combined body in which the first connecting member and the second connecting member are combined can be made compact. Further, the number of parts of various devices (for example, fluid separation devices) using this combined body can be reduced, and the entire device can be made compact.

  Furthermore, in the third aspect, since the thermal expansion coefficient of the first coupling member is smaller than the thermal expansion coefficient of the screw member and the seal member, a fluid having a high temperature of 200 ° C. or higher flows through the internal flow path, whereby the first Even when the temperature of the coupling member, the second coupling member, the seal member, and the screw member rises (for example, from room temperature), there is an effect that the deformation of the seal member is small.

  For example, if the thermal expansion coefficients of the first coupling member and the screw member are smaller than the thermal expansion coefficient of the seal member, even if the seal member tries to expand when the temperature rises, Since there is little change in the dimension of the gap between the two coupling members (change in which the interval becomes wider), the seal member may be plastically deformed. In this case, when the temperature is lowered, the seal member becomes small, but since the shape is changed due to plastic deformation, the sealability may be lowered.

  On the other hand, in the third aspect, when the seal member expands when the temperature rises, the screw member also expands (extends) in the same manner, and the gap between the first coupling member and the second coupling member also increases. Since it spreads, the sealing member is difficult to be plastically deformed. Therefore, even if the temperature decreases and the sealing member becomes small, high sealing performance can be ensured.

As described above, according to the third aspect, the combined body can be made compact compared to the conventional case, and even if there is a temperature change, there is a remarkable effect that high sealing performance (airtightness, watertightness) can be secured. (4) In the coupling body according to the fourth aspect of the present invention, the screw member is a bolt, and the head of the bolt is engaged with the second coupling member.

In the fourth aspect, by screwing the bolt, the head portion of the bolt is engaged with the second coupling member, whereby the first coupling member and the second coupling member can be coupled and integrated. .
(5) In the joined body of the fifth aspect of the present invention, the intermediate member is disposed in a recess provided on a side surface in the radial direction of the first joining member.

  In the fifth aspect, since the intermediate member is disposed in the concave portion of the second engagement member, the first coupling member and the second coupling are engaged by engaging the intermediate member and the screw member (by screw tightening). The members can be combined and integrated. This configuration can increase the strength of the apparatus.

  (6) In the joined body of the sixth aspect of the present invention, the screw member is a bolt, and the intermediate member is a nut provided with the female screw, and the engagement between the bolt and the nut The first coupling member and the second coupling member are coupled.

In the fifth aspect, the first coupling member and the second coupling member can be coupled and integrated by engagement (screwing) of the bolt and the nut.
(7) In the joined body according to the seventh aspect of the present invention, the first joining member is joined to a cylindrical separator that is closed at one end for separating the target fluid from the raw material fluid, and The internal flow path of the combined body and the internal flow path of the separator are configured to communicate with each other.

  The seventh aspect exemplifies a member (for example, a fluid separator such as a hydrogen separator) in which a combined body is used. Thereby, the apparatus (for example, fluid separation apparatus) provided with the separation body can be made compact.

  (8) In the joined body of the eighth aspect of the present invention, the first joining member and the separator are mainly composed of ceramics, and the first joining member and the separator are sintered and joined. Yes.

  In the eighth aspect, since the first coupling member and the separated body are sintered and joined, the number of parts is small, and they are firmly integrated. Moreover, since there is no (or few) gap between the first coupling member and the separator, there is an advantage that leakage of fluid such as gas can be suppressed.

(9) In the joined body according to the ninth aspect of the present invention, the member on which the female screw is formed is made of ceramics, and the member on which the male screw is formed is made of metal.
In the ninth aspect, the material of the dissimilar member constituting the combined body is illustrated. That is, it is possible to easily realize a combined body made of such different members. Moreover, by using this material, the relationship of the thermal expansion coefficient between each member in the said 1st aspect and a 3rd aspect is easily realizable.

(10) In the joined body according to the tenth aspect of the present invention, a helical bush is coaxially disposed between the female screw and the male screw.
Thereby, for example, even when members made of different materials are coupled by screws, they can be firmly coupled. Further, the bush has an advantage that the buffering action (preventing crack generation) is large when the first coupling member is low in toughness such as ceramic.

(11) In the joined body of the eleventh aspect of the present invention, the seal member is made of a metal and has a soft metal layer softer than the metal on the surface.
In the eleventh aspect, since the soft metal layer is provided on the surface of the sealing member, there is an advantage that the sealing performance is improved.

(12) In the coupling body according to the twelfth aspect of the present invention, the outer diameter of the first coupling member in the portion where the female screw is formed is 1.2 times or more the valley diameter of the female screw.
In the twelfth aspect, since the thickness in the radial direction of the portion where the female screw is formed is sufficiently large, there is an advantage that the strength of the first coupling member is high.

(13) In the joined body according to the thirteenth aspect of the present invention, the range in which the male screw and the female screw are engaged is 1.5 pitches or more.
In the thirteenth aspect, since the male screw and the female screw are sufficiently screw-coupled (screwed), there is an advantage that the coupling force between the first coupling member and the second coupling member is high.

It is sectional drawing which fractures | ruptures and shows the hydrogen separator of Example 1 to an axial direction. It is sectional drawing which fractures | ruptures and expands the coupling body of Example 1 to an axial direction. The 1st coupling member of Example 1 is shown, (a) is the top view, (b) is the front view, (c) is a bottom view. The 2nd coupling member of Example 1 is shown, (a) is the top view, (b) is the front view. The sealing member of Example 1 is shown, (a) is the perspective view, (b) is sectional drawing which expands and shows the AA cross section of (a). It is a perspective view which shows the coupling | bonding method of the 1st coupling member of Example 1, and a 2nd coupling member. It is sectional drawing which fractures | ruptures and shows the hydrogen separator of Example 2 to an axial direction. It is sectional drawing which fractures | ruptures and expands the coupling body of Example 2 to an axial direction. The 1st coupling member of Example 2 is shown, (a) is the top view, (b) is the front view, (c) is a bottom view. The 2nd coupling member of Example 2 is shown, (a) is a top view, (b) is the front view. It is sectional drawing which fractures | ruptures and shows the hydrogen separator of Example 3 to an axial direction. It is sectional drawing which fractures | ruptures and expands in the axial direction the coupling body of Example 3. FIG. The 1st coupling member of Example 3 is shown, (a) is the top view, (b) is the front view, (c) is a bottom view. It is a graph which shows an experimental result. It is explanatory drawing which shows the model of the comparative example used for an experimental result.

Hereinafter, embodiments of the combined body of the present invention will be described.
[1] First, each configuration of the above-described combined body of the present invention will be described.
<First coupling member>
As the first coupling member, a ceramic member mainly composed of ceramic or made only of ceramic can be employed. Examples of the ceramic include alumina (thermal expansion coefficient: 7.6 × 10 ⁻⁶ / ° C.), zirconia (thermal expansion coefficient: 10.5 × 10 ⁻⁶ / ° C.), and silicon nitride (thermal expansion coefficient: 3. 0 × 10 ⁻⁶ / ° C.), aluminum nitride (thermal expansion coefficient: 4.0 × 10 ⁻⁶ / ° C.), or the like can be used.

<Second coupling member>
As the second coupling member, a metal member made of a metal (including an alloy) such as stainless steel can be employed. Examples of the metal include SUS316 (thermal expansion coefficient: 16.0 × 10 ⁻⁶ / ° C.), SUS304 (thermal expansion coefficient: 17.3 × 10 ⁻⁶ / ° C.), SUS430 (thermal expansion coefficient: 10.4). × 10 ⁻⁶ / ° C.), Inconel 600 (registered trademark) (thermal expansion coefficient: 13.3 × 10 ⁻⁶ / ° C.), carbon steel (thermal expansion coefficient: 10.8 × 10 ⁻⁶ / ° C.), etc. it can.

<Seal member>
As the seal member, a metal member made of a metal (including an alloy) such as stainless steel similar to the second coupling member can be employed.

<Screw member>
As the screw member, a metal member (for example, a bolt) made of a metal (including an alloy) such as stainless steel similar to the second coupling member and the seal member can be employed.

<Intermediate member>
Examples of the intermediate member include a metal member made of a metal (including an alloy) such as stainless steel similar to the second coupling member and the seal member. For example, a nut (for example, a cap nut) is mentioned.

<Fluid>
Examples of the fluid include gas (gas) or liquid.
Here, a case where the combined body is applied to a fluid separation device that separates a specific fluid, such as a hydrogen separation device, will be described.

Examples of the raw material and the separated fluid include gas (gas) or liquid.
Examples of the fluid separation device include a gas separation device that separates a predetermined gas from a raw material gas, and a liquid separation device that separates a predetermined liquid from a raw material liquid.

  Examples of the gas separation device include a hydrogen separation device that separates hydrogen gas from gas such as raw material natural gas, methylcyclohexane, and ammonia, and an oxygen separation device that separates oxygen from gas such as raw material air. .

  On the other hand, as a liquid separator, acetic acid or water is separated from a filtration device for a membrane separation activated sludge method for separating water from a liquid such as water (sludge) containing raw material impurities, or a mixed solution of acetic acid and water. Examples include a filtration device for separation.

<Separator (separating fluid)>
As the separator, one in which one end in the longitudinal direction (for example, the axial direction) in which the cylindrical portion extends is closed or one in which both ends are provided with open ends can be adopted. In addition, examples of the shape of the cylindrical portion include a cylindrical shape and a rectangular tube shape. In addition, as the cross-sectional shape perpendicular to the axial direction, a circular shape such as a perfect circle or an ellipse is used in the case of a cylinder, and a square, a rectangle, or other polygons are used in the case of a square tube.

Further, as the separator, an appropriate configuration can be adopted depending on the type of a predetermined fluid obtained by the separation.
For example, the gas to be separated can be variously changed depending on the film formed on the ceramic support. Specifically, hydrogen can be separated by forming a hydrogen permeable metal film or a silica film controlled to have pores through which only hydrogen can permeate. Similarly, separation of oxygen by forming an oxygen separation membrane that can only transmit oxygen, separation of carbon dioxide by forming a carbon dioxide separation membrane that can transmit only carbon dioxide, and a membrane that can only transmit water and organic solvents Water separation, solvent separation, etc. can be performed by forming.

Further, a fuel cell, an iron-air cell, or the like can be formed by forming a solid electrolyte membrane and an electrode membrane, and allowing only ions generated from the reaction between the gas and the electrode to pass through the solid electrolyte and take out electricity.
For example, when the fluid separator is a hydrogen separator that separates hydrogen from a raw material gas such as natural gas, as described above, a hydrogen permeable metal membrane (hydrogen separation metal layer) and a support that supports it. As the material of the support, ceramics can be used. As the structure of the support, a part or the whole of a structure made of porous ceramics can be used.

  The part (porous substrate) made of this porous ceramic can permeate a gas containing hydrogen in whole or in part, and the materials thereof include yttria stabilized zirconia (YSZ), stabilized zirconia, alumina, magnesia. , Ceria, doped ceria, and mixtures thereof.

  In addition, a hydrogen separator may be configured by joining a dense portion without gas permeation (dense than the porous substrate) to, for example, an axial end portion of the porous substrate. In addition, as a material which comprises the said dense part, the material similar to a porous base | substrate is mentioned.

  On the other hand, examples of the hydrogen separation metal (hydrogen permeable metal) constituting the hydrogen separation metal layer include Pd alone, Pd alloy (for example, PdAg alloy, PdCu alloy, PdAu alloy) and the like. From the viewpoint of suppressing hydrogen embrittlement, a PdAg alloy is preferable to Pd alone. Further, in the case of a hydrogen separator used at a high temperature (for example, 450 ° C. or higher), a PdAg alloy is desirable.

  As the hydrogen separation metal layer, a structure in which a hydrogen permeable metal is disposed on the surface or inside of the support can be employed. For example, a hydrogen separating metal layer can be formed by filling a hydrogen permeable metal on the porous support surface or inside pores.

  [2] Next, examples of the combined body of the present invention will be described.

Below, the Example of the conjugate | bonded_body used for the hydrogen separator which selectively isolate | separates hydrogen from source gas is demonstrated.
a) First, a schematic configuration of a hydrogen separator in which the combined body of Example 1 is used will be described.

  As shown in FIG. 1, the hydrogen separator 1 selectively separates hydrogen from a raw material gas (for example, a reformed gas that has been reformed from natural gas (rich in hydrogen) and made hydrogen-rich), This is an apparatus capable of obtaining pure hydrogen.

  The hydrogen separator 1 basically includes a test tube-shaped hydrogen separator 3 that separates hydrogen from a raw material gas, a cylindrical metal reaction tube 5 that houses the hydrogen separator 3, and a hydrogen separator. A cylindrical combined body 9 arranged so as to cover the open end 7 of the body 3, a raw material gas supply unit 11 for supplying the raw material gas to the reaction tube 5, and a residual raw material gas after reaction or unreacted is discharged. And a raw material gas discharge unit 13.

Hereinafter, a configuration in which the hydrogen separator 3 and the combined body 9 are integrated is referred to as a composite combined body 10.
Each configuration will be described below.

<Reaction tube 5>
The reaction tube 5 is a cylindrical metal container made of, for example, SUS316, SUS316L, or the like, and the hydrogen separator 3 is coaxially disposed therein. That is, the reaction tube 5 is arranged so as to cover the front end side (upper side in FIG. 1) and the side periphery of the hydrogen separator 3.

  Specifically, the reaction tube 5 has a cylindrical portion 15 that covers the side of the hydrogen separator 3 and a disc-shaped tip portion 17 that covers the tip side thereof. In addition, the rear end side (lower side in FIG. 1) of the reaction tube 5 is closed.

The axial length of the reaction tube 5 is, for example, 450 mm, the inner diameter is, for example, φ57.2 mm, and the outer diameter is, for example, φ60.5 mm.
In addition, a cylindrical source gas supply unit 11 that supplies source gas into the reaction tube 5 from the outside is provided at the distal end portion 17 of the reaction tube 5. This source gas supply unit 11 communicates with the inside of the reaction tube 5 through a first communication unit 17 a opened at the axial center of the tip end portion 17.

  Further, a cylindrical source gas discharge portion 13 for discharging the remaining source gas after reaction or unreacted from the inside of the reaction tube 5 to the outside is provided on the rear end side of the cylindrical portion 15 of the reaction tube 5. It has been. This source gas discharge part 13 communicates with the inside of the reaction tube 5 via a second communication part 13 a opened in the cylindrical part 15.

<Hydrogen separator 3>
The hydrogen separator 3 is, for example, a test tube-shaped member having an inner diameter of 45 mm, an outer diameter of 50 mm, and a length of 350 mm, and has a function of separating only hydrogen from a mixed gas (raw material gas) containing hydrogen. .

  The hydrogen separator 3 includes a porous substrate 19 made of ceramics (for example, yttria stabilized zirconia: YSZ). The pores of the porous substrate 19 are filled with a hydrogen permeable metal such as Pd so that the source gas does not pass through the hydrogen separator 3 as it is. This hydrogen permeable metal is a metal that separates hydrogen from the source gas by selecting and allowing only hydrogen from the source gas to permeate.

  That is, although not shown in the drawing, as is well known, the inside of the porous base 19 is covered with a hydrogen permeable membrane (hydrogen separation metal layer) made of a hydrogen permeable metal so as to cover the entire exposed portion outside the porous base 19. ) Is formed.

<Conjugate 9>
As will be described in detail later, the combined body 9 is a cylindrical member (a combination of a plurality of members) disposed so as to close the open end 7 of the hydrogen separator 3.

  An internal channel 21 is formed at the axial center of the combined body 9 so as to communicate the inside (center hole 4) of the hydrogen separator 3 with the outside. The internal flow path 21 is a hydrogen gas discharge portion (through hole) that discharges hydrogen gas separated and recovered by the hydrogen separator 3 from the hydrogen separator 3 to the outside.

b) Next, the combined body 9 which is a main part of the first embodiment will be described in detail.
As shown in FIG. 2, the coupling body 9 is coupled along the axial direction (for example, coaxially) with the cylindrical first coupling member 23 and the first coupling member 23 by screw coupling (screwing). A cylindrical second coupling member 25, a Helisert (registered trademark) 27 disposed at a coupling portion between the first coupling member 23 and the second coupling member 25, and the first coupling member 23 and the second coupling member 25. And a seal member 29 disposed in the gap 28 in the axial direction.

Each configuration will be described below.
As shown in FIGS. 2 and 3, the first coupling member 23 is a dense (that is, non-breathable) ceramic member made of alumina, for example. The first coupling member 23 includes a cylindrical tip portion 31 having an outer diameter of 45 mm × length 15 mm, for example, on the front end side (upper side in FIG. 2) and an outer diameter φ50 mm × length of 10 mm, for example, on the rear end side (lower side in FIG. 2). And a rear end portion 33 having a cylindrical shape (having a larger diameter than the front end portion 31). The outer diameter of the tip 31 is set slightly smaller than the inner diameter of the center hole so that the tip 31 of the first coupling member 23 can be fitted into the center hole 4 of the hydrogen separator 3.

  Among these, the hydrogen separator 3 is fitted on the outer peripheral surface of the front end portion 31 and sintered and joined, and the rear end of the hydrogen separator 3 abuts on the front end surface 33a of the rear end portion 33 and is sintered. It is joined. In addition, a through hole 35 including a front end side hole 35 a and a rear end side hole 35 b is provided at the axial center of the first coupling member 23. Among these, the front end side hole 35a has an inner diameter of φ8 mm, for example, and the rear end side hole 35b has an inner diameter of φ19.5 mm, which is larger than the front end side hole 35a.

  A first screw portion 37 is formed on the inner peripheral surface of the rear end side hole 35b. The first screw portion 37 has, for example, a valley diameter φ16 mm × mountain diameter φ14.4 mm × length 20 mm. Note that the outer diameters of the front end portion 31 and the rear end portion 33 of the first coupling member 23 are 1.2 times or more the valley diameter of the first screw portion 37.

  As shown in FIGS. 2 and 4, the second coupling member 25 is a metal member made of stainless steel such as SUS316. The second coupling member 25 includes, in the axial direction, a bolt-shaped tip 39 (for example, M16-1.5 of JIS B0205: 2001 standard) on the tip side and an outer diameter (circumscribed circle) of the central portion. ) It is composed of a rotating part 41 of φ30 mm × length 16 mm and a cylindrical rear end part 43 having an outer diameter of φ10 mm × length 50 mm on the rear end side, for example.

  A through hole 44 having an inner diameter similar to that of the distal end side hole 35 a of the first coupling member 23 is formed at the axial center of the second coupling member 25. Accordingly, the tip-side hole 35a and the through-hole 44 constitute an internal flow path 21 that penetrates the entire combined body 9 in the axial direction.

  On the outer peripheral surface of the distal end portion 39, a second screw portion 45 that is screwed with the first screw portion 37 (via the helicate 27) is provided. The range in which the first screw portion 37 that is a female screw and the second screw portion 45 that is a male screw are engaged (screwed) is 1.5 pitches or more (for example, 10 pitches).

The rotating part 41 has a hexagonal outer shape when viewed from the axial direction (plan view).
Note that the helisert 27 (see FIG. 6) is a bush (cylindrical member) in which a metal wire is spirally wound, and is well known to be disposed between a male screw and a female screw to firmly perform screw coupling. It is a member.

  As shown in FIG. 5, the seal member 29 is a metal member made of stainless steel such as SUS316. The seal member 29 is a circular wire having a circular cross section, and has a cross section diameter of 2.4 mm (along the axis center) and an annular inner diameter of, for example, 18 mm.

  Specifically, the seal member 29 includes an annular core portion 29a made of solid SUS316 and a surface layer 29b that is a thin film formed so as to cover the entire outer periphery of the core portion 29a. The surface layer 29b is made of a softer metal (for example, Au, Ag, Cu, etc.) than the material constituting the core portion 29a, and has a thickness of 20 μm, for example.

  As shown in FIG. 2, the seal member 29 has, for example, a width 1... Between the rear end surface 33 b of the rear end portion 33 of the first coupling member 23 and the front end surface 41 a of the rotating portion 41 of the second coupling member 25. It is arranged in a gap 28 of 68 mm. The rear end surface 33b is an annular flat surface excluding the opening portion of the rear end side hole 35b, the front end surface 41a is an annular flat surface excluding the front end portion 39, and the rear end surface 33b and the front end surface are opposed to each other. It is parallel to 41a.

  That is, the seal member 29 surrounds the outer periphery of the distal end portion 39 of the second coupling member 25 in a plan view (as viewed from the axial direction), and accordingly, the outer periphery of the internal channel 21 that is the through hole 35 is disposed at the distal end. It arrange | positions so that it may surround via the part 39. FIG.

  In order to securely arrange the seal member 29 at this position, for example, the seal member 29 is positioned on the rear end surface 33b of the rear end portion 33 or the front end surface 41a (or both) of the rotating portion 41. It is desirable to provide a positioning portion (not shown) such as an annular groove.

The thermal expansion coefficient of alumina constituting the first coupling member 23 is 7.6 × 10 ⁻⁶ / ° C., and the thermal expansion coefficient of SUS316 constituting the second coupling member 25 and the seal member 29 is 16.0 × 10 ⁻ Since it is ⁶ / ° C., the thermal expansion coefficient of the first coupling member 23 is smaller than the thermal expansion coefficients of the second coupling member 25 and the seal member 29.

c) Next, a method for manufacturing the hydrogen separator 1 of the first embodiment will be briefly described.
First, the manufacturing method of the hydrogen separator 3 and the 1st coupling member 23 is demonstrated.
The hydrogen separator 3 and the first coupling member 23 used in Example 1 were produced by, for example, a known press molding method.

  Although not shown in detail, first, a frame mold in which a cylindrical rubber mold corresponding to the shape of the hydrogen separator 3 was arranged on a flat base was provided. A center pin having a shape corresponding to the center hole 4 (see FIG. 1) of the hydrogen separator 3 is provided upright in the rubber mold.

  Next, ceramic granulated powder for forming the porous substrate 19 (for example, granulated powder containing YSZ powder or pore former) is formed in the gap between the rubber mold and the center pin, that is, the portion corresponding to the porous substrate 19. It was filled and then pressed to form.

  In addition to the porous substrate 19, although not shown, first, a frame mold in which a cylindrical rubber mold corresponding to the shape of the first coupling member 23 is arranged on a flat base is provided. A center pin having a shape corresponding to the through hole 35 and the first screw portion 37 is erected in the rubber mold.

  Next, dense ceramic granulated powder (for example, granulated powder containing alumina powder) for forming the first coupling member 23 is formed in the gap between the rubber mold and the center pin, that is, the portion corresponding to the first coupling member 23. It was filled and then pressed to form.

Then, the molded body of the porous substrate 19 was fitted (externally fitted) to the distal end side of the molded body of the first coupling member 23 so as to have the arrangement shown in FIG.
Next, the combined body obtained by combining the two molded bodies was degreased and fired to produce a sintered joined body in which the first coupling member 23 and the porous substrate 19 were integrally sintered and joined.

Thereafter, a hydrogen separation metal layer was formed on the porous substrate 19 by a known method, and the hydrogen separator 3 (with the first bonding member 23 sintered and bonded) was completed.
Separately, the second coupling member 25 was produced by various known metal processing (for example, cutting processing, screw processing, etc.).

Next, a procedure for assembling each member of the hydrogen separator 1 will be described.
As shown in FIG. 6, the helicate 27 is fitted into the rear end side hole 35 b (provided with the first screw portion 37) of the first coupling member 23.

Next, the seal member 29 is externally fitted to the distal end portion 39 of the second coupling member 25.
Next, in a state where the first coupling member 23 is fixed with a jig or the like, a tool (for example, a spanner) is fitted to the rotating portion 41 of the second coupling member 25, and the first helicate 27 of the first coupling member 23 is (2) The front end portion 39 of the coupling member 25 is screwed, and the screwing is stopped while the seal member 29 is pressed.

Thereby, the 1st coupling member 23 and the 2nd coupling member 25 were integrated by screw coupling. That is, as a result, the conjugate 9 and the composite conjugate 10 were completed.
Thereafter, the composite combined body 10 in which the hydrogen separator 3 and the combined body 9 are integrated is inserted into the reaction tube 5. And although not shown in figure, the rear-end part 43 of the coupling body 9 is fixed in the rear-end side of the reaction tube 5, and the hydrogen separation apparatus 1 is completed.

d) Next, the effect of the first embodiment will be described.
In the first embodiment, the first coupling member 23 and the second coupling member 25 are coupled by engaging (screwing) the female thread of the first coupling member 23 and the male thread of the second coupling member 25. ing. An annular seal member 29 is disposed in the gap 28 in the axial direction between the first coupling member 23 and the second coupling member 25 so as to surround the outer peripheral side of the distal end portion 39 of the second coupling member 25.

  With this configuration, the combined body 9 in which the first connecting member 23 and the second connecting member 25 are combined can be made compact. Moreover, the number of parts of the hydrogen separator 1 using this combined body 9 can be reduced, and the whole apparatus can be made compact.

  Further, in the first embodiment, since the thermal expansion coefficient of the first coupling member 23 is smaller than the thermal expansion coefficients of the second coupling member 25 and the seal member 29, a high-temperature fluid of 200 ° C. or higher flows through the internal flow path 21. Thereby, even when the temperature of the first coupling member 23, the second coupling member 25, and the seal member 29 rises (for example, from room temperature), the deformation of the seal member 29 is small. Thereby, even when a temperature change is large, a high sealing performance can be ensured.

  In the first embodiment, a female screw is formed on the inner peripheral surface of the rear end side hole 35 b of the first coupling member 23, and a female screw is formed on the distal end portion 39 of the second coupling member 25. Therefore, the joined body 9 can be easily formed by screwing the distal end portion 39 of the second joining member 25 into the rear end side hole 35b of the first joining member 23.

  In the first embodiment, the first coupling member 23 is joined to the test tubular hydrogen separator 3 whose one end is closed, and the internal flow path 21 of the conjugate 9 and the central hole 4 of the hydrogen separator 3 are connected to each other. Are configured to communicate with each other. Therefore, the hydrogen separator 1 provided with the hydrogen separator 3 can be made compact.

  In the first embodiment, the first coupling member 23 and the hydrogen separator 3 are mainly composed of ceramics, and the first coupling member 23 and the hydrogen separator 3 are sintered and joined. Therefore, the number of parts of the combined body 9 is small, and it is firmly integrated. Moreover, since there is no (or few) gap between the first coupling member 23 and the hydrogen separator 3, there is an advantage that gas leakage can be suppressed.

  In the first embodiment, the first coupling member 23 in which the female screw is formed is made of ceramics, and the second coupling member 25 in which the male screw is formed is made of metal. Therefore, the relationship of the thermal expansion coefficient between each member mentioned above can be easily realized.

  In the first embodiment, since the helical bush is coaxially disposed between the female screw and the male screw, the first coupling member 23 and the second coupling member 25 made of different materials are coupled by screws. In addition, it can be firmly bonded.

In the first embodiment, a soft metal surface layer 29 b is provided on the surface of the seal member 29. Therefore, there is an advantage that the sealing performance is improved.
In the first embodiment, the outer diameter of the first coupling member 23 in the portion where the female screw is formed is 1.2 times or more the valley diameter of the female screw. Therefore, since the thickness in the radial direction of the portion where the female screw is formed is large, there is an advantage that the strength of the first coupling member 23 is high.

  In the first embodiment, the range in which the male screw and the female screw are engaged is 1.5 pitches or more. Therefore, since the male screw and the female screw are sufficiently screw-coupled (screwed), there is an advantage that the coupling force between the first coupling member 23 and the second coupling member 25 is high.

Next, the second embodiment will be described, but the description of the same contents as the first embodiment will be omitted.
Example 2 is basically the same as Example 1, but the combined body is different from Example 1.

  As shown in FIG. 7, the hydrogen separator 51 according to the second embodiment includes a hydrogen separator 53 (similar to that of the first embodiment) and an integrated cylinder so as to cover the open end 55 of the hydrogen separator 53. And a reaction tube 61 (similar to the first embodiment) that accommodates the composite combined body 59 in which the hydrogen separator 53 and the combined body 57 are integrated.

  As shown in FIG. 8, the coupling body 57 includes a cylindrical first coupling member 63, a cylindrical second coupling member 65, and the first coupling member 63 and the second coupling member 65 coupled by screw coupling. A plurality of (for example, six) screw members (bolts) 67 and an annular seal member (similar to the first embodiment) disposed in the gap 69 between the first coupling member 63 and the second coupling member 65. 71. The bolt 67 is made of the same metal material as the seal member 71.

  An internal flow path 73 is formed at the axial center of the combined body 57. The internal flow path 73 includes a first through hole 73 a provided at the axial center of the first coupling member 63, a second through hole 73 b provided at the axial center of the second coupling member 65, and the shaft of the seal member 71. And a center-side space 73c. That is, the internal flow path 73 is integrally configured by the first through hole 73a, the space 73c, and the second through hole 73b.

  As shown in FIGS. 8 and 9, the first coupling member 63 is a dense ceramic member made of alumina, for example, and has a circular tip 75 having a diameter of 45 mm × 15 mm in length, and a diameter of φ56 mm × It is composed of a circular rear end 77 having a length of 30 mm.

The first through hole 73a having a diameter of 8 mm is provided at the axial center of the first coupling member 63.
In addition, screw holes 79 are formed in the rear end surface 77b of the rear end portion 77 of the first coupling member 63 at six locations along the outer periphery at equal intervals of 60 degrees with respect to the axial center. The screw hole 79 corresponds to, for example, M10-P1 of JIS B0205: 2001 standard.

The screw hole 79 is fitted with the same helicate 80 (see FIG. 8) as in the first embodiment.
As shown in FIGS. 8 and 10, the second coupling member 65 is a metal member made of, for example, SUS316, and has a circular tip 81 having a diameter of 50 mm × length of 10 mm, and a diameter of φ10 mm × length of 50 mm smaller than that. And a rear end portion 83 of a circular shape.

The second through-hole 73b having a diameter of 8 mm is provided at the axial center of the second coupling member 65.
In addition, the distal end portion 81 of the second coupling member 65 is formed with screw through-holes 85 (in which bolts 67 are inserted) at six locations along the outer periphery at equal intervals of 60 degrees with respect to the axial center. ing. The inner diameter of the screw through hole 85 is φ10.5 mm.

  As shown in FIG. 8, the bolt 67 is disposed so as to pass through the screw through hole 85 of the distal end portion 81 of the second coupling member 65, and the thread portion at the distal end is the rear end of the first coupling member 63. The screw hole 79 of the portion 77 is screwed (via the helicate 80).

  Further, the seal member 71 is disposed in a gap 69 between the rear end surface 77 b of the rear end portion 77 of the first coupling member 63 and the front end surface 81 a of the front end portion 81 of the second coupling member 65. Specifically, it is arranged so as to surround the outer periphery of the space 73 c that connects the first through hole 73 a and the second through hole 73 b, and is arranged on the axial center side from each bolt 67.

  Therefore, by tightening each bolt 67, the head 67 a of the bolt 67 presses the second coupling member 65, and the first coupling member 63 and the second coupling member 65 are integrated with each other via the seal member 71. Can be combined.

Also in the second embodiment, as in the first embodiment, the combined body 57 and the hydrogen separator 51 can be made compact and high sealing performance can be secured.
Further, in the second embodiment, since the first coupling member 63 and the second coupling member 65 are coupled using the bolt 67, the structure of the second coupling member 65 can be simplified compared to the first embodiment. is there.

Next, the third embodiment will be described, but the description of the same contents as the second embodiment will be omitted.
The third embodiment is basically the same as the second embodiment, but the combined body is different from the second embodiment.

  As shown in FIG. 11, the hydrogen separator 91 according to the third embodiment includes a hydrogen separator 93 (similar to that of the second embodiment) and an integrated cylinder that covers the open end 95 of the hydrogen separator 93. And a reaction tube 101 (similar to that of Example 2) that accommodates the composite combined body 99 in which the hydrogen separator 93 and the combined body 97 are integrated.

  As shown in FIG. 12, the coupling body 97 includes a cylindrical first coupling member 103, a cylindrical second coupling member 105, and a plurality of (a first coupling member 103 and a second coupling member 105. For example, six screw members (bolts similar to those in the second embodiment) 107 and an annular shape (similar to the second embodiment) disposed in the gap 109 between the first coupling member 103 and the second coupling member 105. And a seal member 111.

  An internal flow path 113 is formed at the axial center of the combined body 97. The internal flow path 113 includes a first through hole 113 a provided at the center of the first coupling member 103, a second through hole 113 b provided at the center of the second coupling member 105, and the shaft of the seal member 111. It is comprised by the space 113c of the center side. That is, the internal flow path 113 is integrally configured by the first through hole 113a, the space 113c, and the second through hole 113b.

  As shown in FIGS. 12 and 13, the first coupling member 103 is a dense ceramic member made of alumina, for example, and has a circular tip portion 115 having a diameter of 45 mm × 15 mm in length and a diameter φ50 mm × 50 mm larger than that. It is composed of a circular rear end portion 117 having a length of 30 mm.

  In addition, a groove 121 that is a concave portion in which a nut (cap nut) 119 (see FIG. 12), which will be described later, can be disposed is formed in the rear end portion 117 in an annular shape along the circumferential direction. The groove 121 has a depth of 12 mm and a width of 15 mm.

And by this groove | channel 121, the rear-end side (under FIG.13 (b)) of the rear-end part 117 becomes the flange 123 of thickness 5mm.
The flange 123 is formed with screw through-holes 125 through which the bolts 107 are inserted at equal intervals of 60 degrees with respect to the axis center along the outer periphery thereof. The screw through-hole 125 communicates with the groove 121 and has an inner diameter of φ6.5 mm.

  Each nut 119 is arranged in the groove 121 so that each screw through hole 125 is aligned with the center of the shaft. The nut 119 is made of the same metal material as the bolt 107.

The first through hole 113a having a diameter of 8 mm is provided at the axial center of the first coupling member 103.
As shown in FIG. 12, the second coupling member 105 is the same as the second coupling member of the second embodiment, and screw through holes 129 are formed at six positions of the tip end portion 127.

Note that the second through hole 113b having a diameter of 8 mm is provided at the axial center of the second coupling member 105.
The bolt 107 is disposed so as to pass through the screw through hole 129 of the distal end portion 127 of the second coupling member 105 and the screw through hole 125 of the flange 123 of the first coupling member 103, and the thread portion at the distal end thereof. Is screw-coupled to the nut 119 disposed in the groove 121 of the first coupling member 105.

  Further, the seal member 111 is disposed in the gap 109 between the rear end surface 117 b of the rear end portion 117 of the first coupling member 103 and the front end surface 127 a of the front end portion 127 of the second coupling member 105. Specifically, it is arranged so as to surround the outer periphery of the space 113c connecting the first through hole 113a and the second through hole 113b, and is arranged on the axial center side from each bolt 107.

  Therefore, by tightening each bolt 107, the head 107 a of the bolt 107 presses the second coupling member 105, and the first coupling member 103 and the second coupling member 105 are integrated with each other via the seal member 111. Can be combined.

Also in the third embodiment, the same effect as in the second embodiment is obtained.
Further, in the third embodiment, a nut 119 is disposed in the groove 121, and a metal bolt 107 similar to the metal nut 119 is screw-coupled, so that a strong coupling can be achieved without using a helicate. There is an effect that can be done. Further, as in the second embodiment, there is an advantage that it is not necessary to form a screw hole in the first coupling member.

<Experimental example>
Next, an experimental example performed to confirm the present invention will be described.
In the present experimental example, a model of the configuration of the combined body similar to that of the first embodiment was set, and the relationship between the temperature and the axial force (the coupling force between the first coupling member and the second coupling member in the axial direction) was examined. .

Specifically, the axial force was obtained by a well-known structural analysis technique using a finite element method using ANSYS (registered trademark) structural analysis software. The result is shown in FIG.
As is apparent from the figure, in the present invention, it is understood that the axial force equivalent to the bond between the metal and the metal (see FIG. 14B) can be obtained in spite of the bond between the ceramic and the metal. .

  In addition, a model of the bonded body of Comparative Example 1 (bonded body of ceramic and metal) and the bonded body of Comparative Example 2 (bonded body of metal and metal) is set, and the relationship between temperature and axial force is simulated. I investigated.

  Specifically, ANSYS (registered trademark) structural analysis software was used, and the model (axisymmetric) shown in FIG. 15 was set as a simulation model, and the simulation was performed under the following conditions.

Metal member: SUS316
Ceramic member: Alumina O-ring: SUS316L
Experiment content: A force was applied in the axial direction so that the deformation amount of the O-ring was 20%, and the temperature was changed in this state to obtain the axial force.

The result is shown in FIG. 14 (b), and it can be seen that a higher axial force is obtained in the case of bonding between the metal and the metal even when the temperature is changed than in the case of bonding between the ceramic and the metal.
That is, as is apparent from FIGS. 14A and 14B, the present invention is suitable because a high axial force can be obtained even when the temperature changes.

In addition, this invention is not limited to the said embodiment and Example at all, and it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from this invention.
(1) For example, the material of the seal member and the second coupling member may be different.

(2) As for the hydrogen separator, a test tubular porous substrate may be used on the front end side, and a dense cylindrical ceramic body may be used on the rear end side in contact with the first coupling member.
(3) About the nut of Example 3, the nut which a normal screw hole penetrates other than a cap nut can be used. Moreover, you may provide a recessed part (it match | combined with the external shape of the nut) so that a nut may be arrange | positioned instead of providing a groove | channel in a large diameter part in the perimeter.

  (4) The configuration of each embodiment can be applied to other embodiments as appropriate.

DESCRIPTION OF SYMBOLS 1, 51, 91 ... Hydrogen separator 3, 53, 93 ... Hydrogen separator 5, 61, 101 ... Reaction tube 21, 73, 113 ... Internal flow path 23, 63, 103 ... 1st coupling member 25, 65, 105 ... Second coupling member 28, 69, 109 ... Gap 29, 71, 111 ... Seal member 67, 107 ... Screw member 67a, 107a ... Head 119 ... Intermediate member (nut)
121 ... Groove

Claims (13)

The cylindrical first coupling member and the cylindrical second coupling member are coupled, and at least a part of the internal flow path is formed by the through holes of the both coupling members,
In the cylindrical combined body in which a fluid having a temperature of 200 ° C. or higher may flow in the internal flow path,
A female screw is formed on the first coupling member, a male screw is formed on the second coupling member, and the first coupling member and the second coupling member are engaged by engagement of the female screw and the male screw. Are combined,
There is a gap in the axial direction at a part between the first coupling member and the second coupling member, and the gap surrounds the outer peripheral side of the portion having the through hole of the second coupling member. An annular seal member is arranged,
Furthermore, the first expansion member has a coefficient of thermal expansion smaller than that of the second connection member and the seal member. One end of the second coupling member is fitted into the through hole of the first coupling member,
The female screw is formed on the inner peripheral surface of the through hole of the first coupling member, and the male screw is formed on the outer peripheral surface of one end of the second coupling member. The conjugate described. The cylindrical first coupling member and the cylindrical second coupling member are coupled, and at least a part of the internal flow path is formed by the through holes of the both coupling members,
In the cylindrical combined body in which a fluid having a temperature of 200 ° C. or higher may flow in the internal flow path,
A female screw is formed on the first coupling member or an intermediate member engaged with the first coupling member, a screw member having a male screw is disposed on the second coupling member, and the screw member is The second coupling member passes through the second coupling member in the axial direction and is engaged with the second coupling member, and the first coupling member and the second coupling member are engaged with each other by the female screw and the male screw. Combined,
An annular seal member is disposed in a gap in the axial direction between the first coupling member and the second coupling member so as to surround the outer peripheral side of the internal flow path,
Further, the first coupling member has a thermal expansion coefficient smaller than that of the screw member and the seal member.   The said screw member is a volt | bolt and the head of the said bolt is engaging with the said 2nd coupling member, The coupling body of Claim 3 characterized by the above-mentioned.   The said intermediate member is arrange | positioned at the recessed part provided in the side surface in the radial direction of a said 1st coupling member, The coupling body of Claim 3 or 4 characterized by the above-mentioned.   The screw member is a bolt, and the intermediate member is a nut provided with the female screw, and the first coupling member and the second coupling member are coupled by engagement of the bolt and the nut. The conjugate according to any one of claims 3 to 5, wherein:   The first coupling member is joined with a cylindrical separator whose one end is separated from the raw material fluid, and has an internal channel and an internal channel of the separator. The combined body according to any one of claims 1 to 6, wherein the combined body is configured to communicate with each other.   The said 1st coupling member and the said separated body are mainly comprised from ceramics, The said 1st coupling member and the said separated body are sinter-bonded, The coupling body of Claim 7 characterized by the above-mentioned. .   The member according to any one of claims 1 to 8, wherein the member in which the female screw is formed is made of ceramics, and the member in which the male screw is formed is made of metal.   The combined body according to any one of claims 1 to 9, wherein a helical bush is coaxially disposed between the female screw and the male screw.   The bonded body according to any one of claims 1 to 10, wherein the seal member is made of a metal and includes a soft metal layer softer than the metal on a surface thereof.   12. The outer diameter of the first coupling member in a portion where the female screw is formed is 1.2 times or more the valley diameter of the female screw. Conjugate of.   The combined range according to any one of claims 1 to 12, wherein a range in which the male screw and the female screw are engaged is 1.5 pitches or more.