JP6383576B2 - Graphite structure - Google Patents

Description

  The present invention relates to a graphite structure.

Conventionally, graphite materials are widely used as, for example, structural members of high-temperature furnaces because they have heat resistance and chemical stability. The triple point of the graphite material is high in pressure and temperature, and has the property of sublimating without melting at normal pressure.
For this reason, the graphite material cannot be welded, and the graphite structure is obtained by cutting and joining. However, when a structural member is obtained by cutting, an integral structural member is obtained, and thus there is a problem that a material yield is poor instead of obtaining a high-strength structural member.

Patent Document 1 shows a case where a graphite structure (graphite heating element) is formed by bonding.
That is, in Patent Document 1, a heat generating portion and a tip portion are joined by inserting a tapered portion provided at the tip of the heat generating portion into the tip portion and screwing a nut into the tip portion.

Japanese Utility Model Publication No. 61-138186

  However, in the joint structure described in Patent Document 1 described above, when bending stress is applied to the joining portion of the heat generating portion and the tip portion, the outer peripheral surface of the taper portion is against the inner peripheral surface of the hole provided in the tip portion. Concentration of stress that is locally pressed occurs, which may break the heat generating portion.

  The present invention has been made to solve the conventional problems, and an object of the present invention is to provide a graphite structure capable of minimizing adverse effects such as breakage when bending stress is applied to the joint. To do.

  The graphite structure of the present invention includes a first member having an insertion portion, a main body portion adjacent to the insertion portion, a second member having a recess into which the insertion portion is inserted, the insertion portion, and the recess. A graphite structure comprising: a large-diameter portion having an outer peripheral surface bonded to the inner peripheral surface of the recess through the adhesive layer; and the large-diameter portion. And a small-diameter portion that is smaller in diameter than the large-diameter portion, and the small-diameter portion corresponds to a peripheral edge portion on the open end side of the inner peripheral surface of the recess. It is provided in the position to do.

Examples of the small-diameter portion in the present invention include a columnar shape having a predetermined diameter dimension continuous along the axial direction, a cylindrical shape, a frustoconical shape, or a groove continuing in the circumferential direction. The truncated cone is also called a truncated cone, and indicates a remaining portion obtained by removing the head of the cone with a plane parallel to the bottom surface.
Moreover, when forming the groove | channel which continues in the circumferential direction as a small diameter part in this invention, a semicircle shape, V shape, a rectangular shape etc. can be illustrated as a cross-sectional shape of a groove | channel.

According to the graphite structure of the present invention, the inner peripheral surface of the concave portion and the small diameter portion are separated from each other, and a space larger than the thickness dimension of the adhesive layer is formed between the inner peripheral surface of the concave portion and the small diameter portion. This space is expanded toward the central axis from the large diameter portion toward the small diameter portion with respect to the inner peripheral surface of the recess.
Therefore, according to the graphite structure of the present invention, in the boundary portion between the large diameter portion and the small diameter portion, the notch formed by this space faces outward toward the second member side, and the fracture extends outward. For this reason, according to the graphite structure of the present invention, even if stress is applied to the joining portion of the first member and the second member, it only acts to break the end of the concave portion of the second member. It is possible to reduce the possibility of adversely affecting the joint, and to reduce the damage at the joint.

  Moreover, it is desirable that the graphite structure of the present invention has the following mode.

(1) The outer peripheral surface of the small diameter portion has a conical surface that tapers from the large diameter portion toward the main body portion.
Examples of the small-diameter portion in the present invention include a conical surface connected by a linear bus extending from the edge of the outer peripheral surface of the large-diameter portion toward the edge of the outer peripheral surface of the main body, but a conical surface having a curved bus But you can.
As a conical surface having a curved generatrix, an arc line that is concave toward the axis of the small diameter portion rather than a straight line connecting the edge of the outer peripheral surface of the large diameter portion and the edge of the outer peripheral surface of the main body portion is used as the generatrix. A conical surface is preferred. Such a conical surface has a constricted shape.
Moreover, the connection part of a large diameter part and a small diameter part does not need to have a clear boundary line. For example, you may have the R surface chamfered and the C surface chamfered.

According to the graphite structure of the present invention, since the outer peripheral surface of the small diameter portion is a conical surface, a space can be formed between the first member and the second member without making a notch in the small diameter portion.
Therefore, according to the graphite structure of the present invention, even if stress is applied to the joint portion of the first member and the second member, there is no notch facing the first member side, so stress concentrates on a specific portion of the first member. The possibility of adversely affecting the first member can be further reduced.

(2) The diameter of the small diameter portion is equal to or greater than the diameter of the main body.
According to the graphite structure of the present invention, since the diameter of the small diameter portion is the same as or larger than the diameter of the main body portion, excessive constriction is not formed on the main body portion side in the fitting portion.
Therefore, according to the present invention, even if stress is applied to the joint portion of the first member and the second member, the stress acts in a distributed manner on the entire first member and can hardly be broken in the vicinity of the fitting portion and is damaged. A difficult graphite structure is obtained.

(3) A chamfered portion is provided at the peripheral edge portion on the open end side of the inner peripheral surface of the concave portion of the second member.
The chamfered portion may be a C surface that is inclined with respect to the end surface on the first member side and the inner peripheral surface of the recess, or may be an R surface that is continuous with the end surface on the first member side and the inner peripheral surface of the recess.
When the chamfered portion is a C surface, the end portion on the inner peripheral surface of the concave portion is the inner periphery of the concave portion of the two boundary lines with respect to the end surface on the main body portion side of the first member and the inner peripheral surface of the concave portion. Indicates the boundary line to the face.

According to the graphite structure of the present invention, since the chamfered portion is provided between the end surface on the first member side and the inner peripheral surface of the concave portion, the fitting portion is used for joining the first member and the second member. Since the chamfered portion guides the open side edge of the fitting portion, the fitting portion can be easily fitted into the concave portion. Further, according to the graphite structure of the present invention, since the boundary line between the large diameter portion and the small diameter portion of the first member is inserted from the end portion on the inner peripheral surface of the second member to the flange, the space is formed. The notch to be turned becomes outward toward the second member side, and the destruction is extended outward. For this reason, according to the graphite structure of the present invention, even if stress is applied to the joint portion of the first member and the second member, the stress is applied to the joint portion only by acting to break the end portion of the concave portion of the second member. The influence can be reduced.
That is, according to the graphite structure of the present invention, it is not necessary to excessively reduce the diameter of the small diameter portion in order to increase the space formed between the inner peripheral surface of the concave portion and the small diameter portion. There is no risk of causing a lack of strength.

(4) The adhesive layer is a carbonaceous adhesive layer.
The carbon-based adhesive layer is an adhesive layer obtained by carbonizing, for example, by firing a phenol resin, a copna resin, a furan resin, or the like. Since the carbon-based adhesive layer is the same type of carbon-based material as the first member and the second member, the carbon-based adhesive layer has heat resistance and chemical stability and can be used even in a harsh environment.

(5) At least one of the first member and the second member has a through hole along a central axis of the fitting portion.
According to the graphite structure of the present invention, since at least one of the first member and the second member has a through-hole, an adhesive that serves as an adhesive layer when joining the first member and the second member Is applied in advance to the inner peripheral surface of the recess or the outer peripheral surface of the large diameter portion, and the inner periphery of the recess and the outer periphery of the large diameter portion are joined by joining the first member and the second member. An adhesive layer having a desired thickness dimension can be formed between the surface and the surplus adhesive can be discharged to the through hole between the bottom surface of the recess and the end surface of the large diameter portion.
That is, according to the graphite structure of the present invention, an adhesive layer having an appropriate thickness can be formed between the inner peripheral surface of the recess and the outer peripheral surface of the large-diameter portion. Moreover, according to the graphite structure of the present invention, the adhesive shrinks during the carbonization process. By removing the excess adhesive, the amount of shrinkage can be reduced, the inside can be made difficult to crack, and the strength can be increased.

  According to the present invention, in the boundary portion between the large diameter portion and the small diameter portion, the notch formed by this space faces outward toward the second member side, and the fracture extends outward. For this reason, according to this invention, even if stress is added to the joining location of the 1st member and the 2nd member, it only acts so that the edge of the crevice of the 2nd member may be broken, and it has a bad influence on a joined part. It is possible to provide a graphite structure that can reduce the fear and damage of the joint portion is small.

(A) is sectional drawing which cut | disconnected the graphite structure of 1st Embodiment based on this invention along the axis line, (B) is an expanded sectional view of "B" part in (A) (A) is sectional drawing which cut | disconnected the graphite structure of 2nd Embodiment based on this invention along the axis line, (B) is an expanded sectional view of "B" part in (A) (A) is sectional drawing which cut | disconnected the graphite structure of 3rd Embodiment based on this invention along the axis line, (B) is an expanded sectional view of the "B" part in (A). Front view of a graphite member according to a fourth embodiment of the present invention. Sectional drawing cut | disconnected along the axis line of the graphite structure of 4th Embodiment which concerns on this invention The perspective view cut along the axis of the graphite structure of a 4th embodiment concerning the present invention. The front view of the graphite member of 5th Embodiment which concerns on this invention Sectional drawing cut | disconnected along the axis line of the graphite structure of 5th Embodiment which concerns on this invention The perspective view cut along the axis of the graphite structure of a 5th embodiment concerning the present invention. Front view of a graphite member according to a sixth embodiment of the present invention Sectional drawing cut | disconnected along the axis line of the graphite structure of 6th Embodiment which concerns on this invention The perspective view cut along the axis of the graphite structure of a 6th embodiment concerning the present invention. Front view of a graphite member according to a seventh embodiment of the present invention Sectional drawing cut | disconnected along the axis line of the graphite structure of 7th Embodiment concerning this invention The perspective view cut along the axis of the graphite structure of a 7th embodiment concerning the present invention. (A) is sectional drawing of the groove part in 4th Embodiment, (B)-(D) is sectional drawing which shows the modification of the cross-sectional shape of a groove part.

(First embodiment)
Hereinafter, the graphite structure of the first embodiment will be described with reference to the drawings.
As shown in FIGS. 1 (A) and 1 (B), the graphite structure 20A of the first embodiment includes a first graphite member (first member) 21A, a second graphite member (second member) 22A, Have

The first graphite member 21 </ b> A includes a cylindrical insertion portion 23 and a main body portion 24 adjacent to the insertion portion 23. 22 A of 2nd graphite members have the recessed part 15 in which the insertion part 23 is inserted. The fitting portion 23 and the concave portion 15 are bonded by an adhesive layer 26. The adhesive layer 26 is a carbonaceous adhesive layer. Here, the carbon-based adhesive layer is an adhesive layer obtained by carbonizing, for example, by firing a phenol resin, a copna resin, a furan resin, or the like.
The fitting portion 23 has a large-diameter portion 27 on the distal end side and a small-diameter portion 28 on the main body portion 24 side. The outer peripheral surface 271 of the large diameter portion 27 is bonded to the inner peripheral surface 153 of the recess 15 via the adhesive layer 26. Therefore, the outer diameter of the large diameter portion 27 is smaller than the inner diameter of the recess 15. Further, the diameter dimension of the large diameter part 27 is larger than the diameter dimension of the main body part 24.

The small diameter portion 28 is provided on the main body portion 24 side with respect to the large diameter portion 27 and connects the large diameter portion 27 having a large outer diameter and the main body portion 24 having a small outer diameter. The small-diameter portion 28 has a smaller diameter than the large-diameter portion 27 and has a conical surface shape that tapers from the large-diameter portion 27 toward the main body portion 24.
Here, as the conical surface, a conical surface that linearly connects the large-diameter portion 27 and the main body portion 24 is illustrated, but a conical surface having a curved generatrix may be used. As the conical surface having a curved generatrix, a conical surface having an arc line that is concave toward the axis of the small diameter portion 28 as a generatrix is preferable even if it is a straight line connecting the large diameter portion 27 and the main body portion 24. . Further, the connecting portion of the large diameter portion 27 with the end edge of the outer peripheral surface 271 or the main body portion 24 with the end edge of the outer peripheral surface 241 may be an arc line.

The small diameter portion 28 is provided at a position corresponding to the peripheral edge portion on the open end portion 151 side in the inner peripheral surface 153 of the concave portion 15.
Therefore, at the position of the open end 151 of the recess 15, a gap S is provided between the open end 151 and the small diameter portion 28.

Next, the effect of the graphite structure 20A will be described.
According to the graphite structure 20A of the present embodiment, the distance between the inner peripheral surface 153 of the recess 15 and the small diameter portion 28 is larger than the thickness of the adhesive layer 26. A space S larger than the thickness dimension of the adhesive layer 26 is formed between the peripheral surface 153 and the small diameter portion 28. This space S is expanded toward the central axis from the large diameter portion 27 toward the small diameter portion 28 with respect to the inner peripheral surface 153 of the concave portion 15.
Therefore, according to the graphite structure 20A of the first embodiment, since the space S forms an outward notch even when bending stress is applied to the joining portion of the first graphite member 21A and the second graphite member 22A, the first It only acts to break the two graphite members 22A, and the possibility of adverse effects on the first graphite member 21A can be reduced.

According to the graphite structure 20A of the first embodiment, since the outer peripheral surface 281 of the small diameter portion 28 is a conical surface, the edge on the main body portion 24 side in the large diameter portion 27 and the large diameter portion 27 side in the main body portion 24 are provided. In other words, the first graphite member 21 </ b> A can be configured without forming a corner portion as a starting point of breakage at a specific portion of the small-diameter portion 28.
Therefore, according to the graphite structure 20A of the first embodiment, even if bending stress is applied to the joint portion of the first graphite member 21A and the second graphite member 22A, the stress concentrates on a specific portion of the first graphite member 21A. Therefore, the possibility of adversely affecting the first graphite member 21A can be further reduced.

According to the graphite structure 20 </ b> A of the first embodiment, since the small diameter portion 28 has a larger diameter than the main body portion 24, an excessive constriction is not formed on the main body portion 24 side in the fitting portion 23.
Therefore, according to the graphite structure 20A of the first embodiment, even if bending stress is applied to the joint portion of the first graphite member 21A and the second graphite member 22A, the stress is dispersed throughout the first graphite member 21A. The graphite structure 20A that acts and is difficult to break in the vicinity of the fitting portion 23 and is not easily damaged is obtained.

According to the graphite structure 20A of the first embodiment, the adhesive layer 26 is a carbonaceous adhesive layer. The carbon-based adhesive layer is an adhesive layer obtained by carbonizing, for example, by firing a phenol resin, a copna resin, a furan resin, or the like.
Therefore, since the carbon-based adhesive layer is the same type of carbon-based material as the first graphite member 21A and the second graphite member 22A, it has heat resistance and chemical stability and can be used even in a harsh environment.

(Second Embodiment)
Hereinafter, the graphite member of 2nd Embodiment is demonstrated using drawing.
In addition, the same code | symbol is attached | subjected to the site | part which is common in the graphite structure 20A of 1st Embodiment mentioned above, and the overlapping description is abbreviate | omitted.
As shown in FIGS. 2A and 2B, the graphite structure 20B of the second embodiment includes an end surface 29 on the first graphite member 21B side of the second graphite member 22B and an inner peripheral surface of the recess 15. A chamfered portion 31 is provided between 153 and 153.

The chamfered portion 31 may be a C surface inclined with respect to the end surface 29 on the first graphite member 21B side and the inner peripheral surface 153 of the concave portion 15, or the end surface 29 on the first graphite member 21B side and the inner peripheral surface of the concave portion 15 An R surface continuous to 153 may be used.
When the chamfered portion 31 is a C surface, the end portion of the inner peripheral surface 153 of the concave portion 15 is the two boundary lines with respect to the end surface 29 on the first graphite member 21B side and the inner peripheral surface 153 of the concave portion 15. The boundary line with respect to the internal peripheral surface 153 of the recessed part 15 is shown.

According to the graphite structure 20 </ b> B of the second embodiment, the chamfered portion 31 is provided between the end surface 29 on the first graphite member 21 </ b> B side and the inner peripheral surface 153 of the recess 15. For this reason, in joining the 1st graphite member 21B and the 2nd graphite member 22B, while the chamfering part 31 guides the open side edge in the insertion part 23, the insertion part 23 can be easily inserted with respect to the recessed part 15. The space S formed between the inner peripheral surface 153 of the concave portion 15 and the small diameter portion 28 after joining the first graphite member 21B and the second graphite member 22B can be further increased by the chamfered portion 31.
That is, according to the graphite structure 20B of the second embodiment, the small-diameter portion 28 is excessively reduced in diameter in order to increase the space S formed between the inner peripheral surface 153 of the recess 15 and the small-diameter portion 28. Since there is no need, there is no possibility that the strength of the first graphite member 21B will be insufficient.

(Third embodiment)
Hereinafter, the graphite member of 3rd Embodiment is demonstrated using drawing.
In addition, the same code | symbol is attached | subjected to the site | part which is common with the graphite structure 20A of 1st Embodiment mentioned above, and the graphite structure 20B of 2nd Embodiment, and the overlapping description is abbreviate | omitted.
As shown in FIGS. 3A and 3B, in the graphite structure 20 </ b> C of the third embodiment, the first graphite member 21 </ b> C and the second graphite member 22 </ b> C are along the central axis L <b> 1 of the fitting portion 23. A through hole 18 is provided.

According to the graphite structure 20C of the third embodiment, since at least one (both here) of the first graphite member 21C and the second graphite member 22C has the through hole 18, the first graphite member 21C. In joining the second graphite member 22C, the adhesive to be the adhesive layer 26 is previously applied to the inner peripheral surface 153 of the concave portion 15 or the outer peripheral surface 271 of the large-diameter portion 27 so as to be excessive. By bonding the first graphite member 21 and the second graphite member 22, an adhesive layer 26 having a desired thickness can be formed between the inner peripheral surface 153 of the concave portion 15 and the outer peripheral surface of the large diameter portion 27. Excess adhesive 261 can be discharged to the through hole 18 through the space between the bottom surface 152 and the end surface 272 of the large diameter portion 27.
That is, according to the graphite structure 20 </ b> C of the third embodiment, the adhesive layer 26 having an appropriate thickness can be formed between the inner peripheral surface 153 of the recess 15 and the outer peripheral surface 271 of the large diameter portion 27.

(Fourth embodiment)
Hereinafter, the graphite member and the graphite structure of the fourth embodiment will be described with reference to the drawings.
In addition, the same code | symbol is attached | subjected to the site | part which is common in the graphite structure 20A of the graphite structure 20A of 3rd Embodiment thru | or the 1st Embodiment mentioned above, and the overlapping description is abbreviate | omitted.
As shown in FIG. 4, the graphite member 10A of the fourth embodiment has a cylindrical insertion portion 11A and an outer diameter smaller than the outer diameter of the insertion portion 11A that protrudes from one end surface 12 of the insertion portion 11A. A cylindrical connecting portion 13A having a diameter. A recess 15 having an inner diameter corresponding to the outer diameter of the portion connection portion 13A is provided on the other end surface 14 of the fitted portion 11A.

11 A of insertion parts and the connection part 13A are arranged on the same line along the axis line (center axis) CL of 11 A of insertion parts.
The connecting portion 13A corresponds to the first graphite member 21A described above. The fitted portion 11A corresponds to the second graphite member 22A described above.
The connecting portion 13 </ b> A has a fitting portion 23 and a main body portion 24. The fitting part 23 has a large diameter part 27 and a small diameter part 28. Here, a groove portion 17A having, for example, a semicircular cross section as the small-diameter portion 28 described above is provided along the outer peripheral surface of the connection portion 13A. The groove portion 17A is provided in parallel with the one end surface 12 of the fitted portion 11A. The position where the groove 17A is provided will be described later in detail.

As shown in FIGS. 5 and 6, the graphite structure 20 </ b> D is configured using the graphite member 10 </ b> A described above. That is, the graphite structure 20D includes a first graphite member 21D having a connecting portion 13A that can be fitted into the concave portion 15, and the concave portion 15 provided along the axis CL from the fitted portion 11A and the other end face 14 of the fitted portion 11A. The second graphite member 22D having
The first graphite member 21D may have a fitted portion 11A that is continuous with the connecting portion 13A. Further, the second graphite member 22 </ b> D may have a connection portion 13 </ b> A protruding from the one end surface 12.

In this case, both the first graphite member 21D and the second graphite member 22D correspond to the graphite member 10A described above.
A plurality of graphite members 10A can be connected by joining the first graphite member 21A and the second graphite member 22A.

The groove portion 17A provided in the connecting portion 13A is formed at a position facing the open end 151 of the inner peripheral surface 153 of the concave portion 15 when another connecting portion 13A coupled to the concave portion 15 is inserted. .
That is, the distance H1 from the tip surface 131 of the connecting portion 13A to the tip surface side end 171 of the groove 17A is smaller than the distance H2 from the bottom surface 152 of the recess 15 to the open end 151. Furthermore, the distance H3 from the tip surface 131 to the opposite end 172 of the groove 17A is larger than the distance H2 from the bottom surface 152 of the recess 15 to the open end 151.
Thereby, even if bending acts on the graphite structure 20D, the open end 151 of the fitted portion 11A does not contact the main body 24 of the connecting portion 13A.

In the graphite structure 20D shown in FIG. 5 and FIG. 6, the one end surface 12 and the other end surface 14 of the two joined graphite members 10A are illustrated as an example. The distance from the end face 14 can be adjusted.
For example, the other end surface 14 of the second graphite member 221D (22D) and the one end surface 12 of the first graphite member 212D (21D) to be joined can be brought into close contact with each other. That is, the entire connection portion 13A is accommodated in the recess 15 by making the depth of the recess 15 larger than the length of the connection portion 13A. At this time, the groove portion 17A is provided at the base end portion of the connection portion 13A.

Next, the effect of the graphite member 10A will be described.
11 A of insertion parts and the connection part 13A which were arranged along the same line are connected to 13 A of recessed parts 15 which are provided in the other end surface 14 of the insertion part 11A, and have the internal diameter dimension corresponding to the outer diameter dimension of the connection part 13A. To be joined.
Then, when the connecting portion 13A of the other graphite member 10A is inserted into the concave portion 15, the groove portion 17A continuous in the circumferential direction of the main body portion 24 is formed at a position facing the open end portion 151 of the concave portion 15 in the connecting portion 13A. Provided.
For this reason, when bending acts on the graphite member 10A, the open end 151 of the recess 15 is positioned in the groove 17A, so that the open end 151 comes into contact with the main body 24 of the connecting portion 13A and concentrated stress is generated. Can be prevented and adverse effects such as breakage can be minimized.

Next, the effect of the graphite structure 20D will be described.
The graphite structure 20D includes a fitted part 11A and a second graphite member 22D having a recessed part 15 provided along the axis CL from the end surface (the other end face 14) of the fitted part 11A, and a connecting part that can be fitted into the recessed part 15. And a first graphite member 21D having 13A.
Then, when the connecting portion 13A is inserted into the concave portion 15 in the connecting portion 13A, the groove portion 17A continuously formed along the circumferential direction at a position corresponding to the open end portion 151 on the inner peripheral surface 153 of the concave portion 15. Was provided.
For this reason, when bending acts on the graphite structure 20D, the open end 151 of the recess 15 is positioned in the groove 17A, so that the open end 151 abuts on the main body 24 of the connecting portion 13A and concentrated stress is generated. Occurrence can be prevented, and adverse effects such as breakage can be minimized.

(Fifth embodiment)
Next, the graphite member and the graphite structure of the fifth embodiment will be described with reference to the drawings.
In addition, the same code | symbol is attached | subjected to the site | part which is common in the graphite structure 20D of 4th Embodiment, and the graphite member 10A of 4th Embodiment, and the overlapping description is abbreviate | omitted in the 1st Embodiment mentioned above. I decided to.

As shown in FIG. 7, in the graphite member 10 </ b> B of the fifth embodiment, a groove portion 17 </ b> A continuous in the circumferential direction is provided as the small diameter portion 28. And the base end side part 132 by the side of the insertion part 11B from the groove part 17A in the connection part 13B is extended and formed from the bottom part 173 of the groove part 17A to the insertion part 11B side. Accordingly, the base end side portion 132 is formed in a columnar shape having the same outer diameter as the outer diameter of the bottom portion 173 of the groove portion 17A. In other words, half of the groove 17A is formed, and the opposite end 172 (see FIG. 5) does not exist.
As shown in FIGS. 8 and 9, in the graphite structure 20E of the fifth embodiment using the graphite member 10B described above, the connecting portion 13B of the first graphite member 21E is fitted into the recess 15 of the second graphite member 22E. Thus, the first graphite member 21E and the second graphite member 22E are joined.

Therefore, the connection part 13B of the first graphite member 21E extends from the bottom part 173 of the groove part 17A to the one end face 12 of the insertion part 11B in parallel with the axis CL.
As a result, when bending acts on the graphite structure 20E, the open end 151 of the recess 15 does not come into contact with the base end side 132 of the connecting portion 13B, so that the open end 151 comes into contact and a concentrated stress is generated. Can be prevented and adverse effects such as breakage can be minimized.

(Sixth embodiment)
Next, the graphite member and the graphite structure of the sixth embodiment will be described with reference to the drawings.
The parts common to the graphite structure 20A of the first embodiment to the graphite structure 20E of the fifth embodiment, the graphite member 10A of the fourth embodiment, and the graphite member 10B of the fifth embodiment are denoted by the same reference numerals. A duplicate description will be omitted.

As shown in FIG. 10, the graphite member 10 </ b> C of the sixth embodiment penetrates the fitted portion 11 </ b> A and the connecting portion 13 </ b> A along the axis CL in the graphite member 10 </ b> A (see FIG. 4) of the fourth embodiment described above. A through hole 18 is provided.
That is, the through hole 18 is formed from the tip surface 131 of the connecting portion 13C to the bottom surface 152 of the concave portion 15 of the fitted portion 11C. The through hole 18 has the same inner diameter in the fitted portion 11C and the connecting portion 13C. The inner diameter of the through hole 18 is large enough to ensure a sufficient thickness even at the bottom 173 of the groove 17A.
Thereby, since the graphite member 10C has the through-hole 18 formed along the axis line CL, it comprises a cylindrical shape.

As shown in FIGS. 11 and 12, the graphite structure 20F of the sixth embodiment using the above-described graphite member 10C is replaced with the graphite structure 20D of the fourth embodiment described above (see FIGS. 5 and 6). A through hole 18 is provided along the axis CL.
Accordingly, when a plurality of graphite members 10C are joined in the direction of the axis CL, a through hole 18 penetrating the graphite structure 20F is formed.

As described above, in the graphite structure 20F described above, the first graphite member 21F and the second graphite member 22F have the through holes 18 formed along the axis CL, so that the graphite structure 20F forms a cylindrical shape.
For this reason, the intensity | strength with respect to the bending of the graphite structure 20F can be increased.

(Seventh embodiment)
Next, the graphite member and the graphite structure of the seventh embodiment will be described with reference to the drawings.
The parts common to the graphite structure 20A of the first embodiment to the graphite structure 20F of the sixth embodiment and the graphite member 10A of the fourth embodiment to the graphite member 10C of the sixth embodiment are denoted by the same reference numerals. A duplicate description will be omitted.

As shown in FIG. 13, the graphite member 10 </ b> D of the seventh embodiment penetrates the fitted portion 11 </ b> B and the connecting portion 13 </ b> B along the axis CL in the graphite member 10 </ b> B (see FIG. 7) of the fifth embodiment described above. A through hole 18 is provided.
The through hole 18 is formed from the front end surface 131 of the connecting portion 13D to the bottom surface 152 of the concave portion 15 of the inserted portion 11D. The through hole 18 has the same inner diameter in the fitted portion 11D and the connecting portion 13D. The inner diameter of the through hole 18 is large enough to ensure a sufficient thickness at the bottom 173 and the base end side 132 of the groove 17A.

  Thus, the graphite member 10D has a through hole 18 formed along the axis CL, and thus forms a cylindrical shape.

As shown in FIGS. 14 and 15, the graphite structure 20 </ b> G of the seventh embodiment using the graphite member 10 </ b> D described above is an axis of the graphite structure 20 </ b> E (see FIGS. 8 and 9) of the fifth embodiment described above. A through-hole 18 penetrating along the CL is provided.
Therefore, when a plurality of graphite members 10D are joined in the direction of the axis CL, a through hole 18 that penetrates the graphite structure 20G is formed.

  Thereby, since the 1st graphite member 21G and the 2nd graphite member 22G have the through-hole 18 formed along the axis line CL, the graphite structure 20G comprises cylindrical shape.

The graphite member and the graphite structure of the present invention are not limited to the above-described embodiments, and appropriate modifications and improvements can be made.
For example, in each of the embodiments described above, the conical shape or the groove portion 17 that is continuous in the circumferential direction is exemplified as the small diameter portion 28, but a predetermined outer diameter smaller than the outer diameter of the large diameter portion 27 is along the axial direction. It can also be a continuous columnar shape or a cylindrical shape.

Further, in each of the embodiments described above, the case where the cross-sectional shape is a semicircle is illustrated as the groove portion 17A (see FIG. 16A), but the present invention is also applicable to groove portions having other cross-sectional shapes.
For example, as shown in FIG. 16B, an R portion 174 can be provided at a boundary portion between the groove portion 17B and the outer peripheral surface of the connecting portion 13A. Further, as shown in FIG. 16C, the groove portion 17C can be V-shaped, and an R portion 174 can be provided at the boundary portion. Further, as shown in FIG. 16D, the groove portion 17D may have a rectangular cross section with rounded corners.

  The present invention can be applied to a graphite structure having a low electrical resistance and capable of minimizing adverse effects such as fracture when bending stress is applied to the joint.

18 Through hole 20 Graphite structure 21 First graphite member (first member)
22 Second graphite member (second member)
23 Insertion portion 24 Body portion 15 Recess 153 Inner peripheral surface 151 Open end portion 26 Adhesive layer 27 Large diameter portion 271 Outer peripheral surface 28 Small diameter portion 281 Outer peripheral surface 29 End surface 31 Chamfered portion L1 Central axis CL axis

Claims (5)

A first member having a fitting portion and a body portion adjacent to the fitting portion;
A second member having a recess into which the insertion portion is inserted;
An adhesive layer that bonds the fitting portion and the recess, and a graphite structure comprising:
The fitting portion is provided between a large diameter portion having an outer peripheral surface bonded to an inner peripheral surface of the concave portion via the adhesive layer, and between the large diameter portion and the main body portion. Also has a small diameter part with a small diameter dimension,
The small diameter portion is al provided in a position corresponding to the periphery of the open end side of the inner peripheral surface of the recess,
At least one of the first member and the second member has a through hole along a central axis of the fitting portion .   The graphite structure according to claim 1, wherein an outer peripheral surface of the small-diameter portion has a conical surface that tapers from the large-diameter portion toward the main body portion.   3. The graphite structure according to claim 1, wherein a diameter dimension of the small diameter portion is equal to or larger than a diameter dimension of the main body portion.   The graphite structure according to any one of claims 1 to 3, further comprising a chamfered portion at a peripheral edge portion on an open end side of the inner peripheral surface of the concave portion of the second member. The graphite structure according to any one of claims 1 to 4, wherein the adhesive layer is a carbonaceous adhesive layer.

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