CN211125050U

CN211125050U - Connection structure for fusion reactor plasma-oriented part

Info

Publication number: CN211125050U
Application number: CN201921109448.1U
Authority: CN
Inventors: 吴晶; 谌继明; 王平怀
Original assignee: Southwestern Institute of Physics
Current assignee: Southwestern Institute of Physics
Priority date: 2019-07-16
Filing date: 2019-07-16
Publication date: 2020-07-28
Anticipated expiration: 2029-07-16

Abstract

The utility model belongs to nuclear fusion field specifically is a connection structure that is used for fusion reactor to face plasma body part. The finger pair and the central beam are adjusted in relative position through the matching of the inclined planes of the adjusting groove and the adjusting block and are fixed through screws; meanwhile, the fingers are provided with dovetail-shaped protruding parts, the central beam is provided with dovetail grooves, and the cooling channels among the fingers, the central beam and the fingers are connected in a mode of external pipe connection. The cooling pipeline adopts the external pipe connection, the structure of the inner cavity at the front part of the finger is simplified, the welding cover plate is not arranged at the outer part of the finger, and the deformation caused by the welding cover plate is eliminated.

Description

Connection structure for fusion reactor plasma-oriented part

Technical Field

The utility model belongs to nuclear fusion field, concretely relates to connection structure of plasma body part.

Background

The cladding system is the component within the fusion reactor that directly faces the high temperature plasma, and includes a First Wall (FW) that directly contacts the plasma and a Shield Block (SB). The first wall is divided into two types of ordinary heat load (NHF FW) and enhanced heat load (EHF FW), and the enhanced heat load type needs to bear the maximum of 4.7MW/m²Surface heat load of (up to 5.9MW/m in the test)²)。

The enhanced heat load first wall model is characterized by a plurality of welded connections. The first wall is divided into two groups which are bilaterally symmetrical by a plurality of fingers, and each finger is connected with the central beam by two welding seams at the front part and the middle part. And the cooling channels between the fingers and the central beam are connected by inserting circular tubes into the inner holes for welding.

According to the past engineering practice experience, even if a laser welding process with highly concentrated heat input is adopted, the large-section welding of the fingers and the central beam still causes large welding deformation, and the assembling precision of other parts nearby the welding position is greatly influenced. In addition, a certain finger (pair) is found to have a defect in a later-stage simulation experiment or operation process of the first wall, the finger with the defect can not be detached and replaced almost, because finger parts are densely arranged on the central beam, the distance between the fingers is only 1mm, the removal of the connecting welding line between the finger and the central beam inevitably damages surrounding parts, the inner hole welding line at the connecting part of the finger and the central beam cooling channel is difficult to perfectly remove, no design allowance is left for repair welding after the removal, and finally the whole first wall plate is scrapped. In the aspect of nondestructive testing, the detection of the welding seam is realized by adopting one-time oblique incidence ultrasonic longitudinal wave, and the welding seam of the inner hole cannot meet the space requirement and cannot be detected.

Disclosure of Invention

The utility model aims at providing a connection structure for fusion reactor is towards plasma body part can realize that the finger reliably dismantles, separates and returns dress, repair welding, fixed many times with the center sill, does not influence the performance of first wall part.

The technical scheme of the utility model as follows:

a connecting structure for a fusion reactor facing to a plasma body part comprises finger pairs and a central beam fixedly connected with the finger pairs, wherein the lower surface of each finger of the finger pairs is provided with a connecting part extending downwards, a certain gap is reserved between the rear end surface of the connecting part and the side end surface of the central beam, the connecting part is provided with an adjusting groove, an adjusting block is arranged in the adjusting groove, and the adjusting block, the connecting part and the central beam are fixed through screws; the adjusting groove and the adjusting block slide relatively through the inclined plane matching, and a certain gap is formed between the upper surface of the adjusting block and the inner surface of the adjusting groove.

Each finger lower surface in the finger pair be equipped with downwardly extending's dovetail protruding portion, central roof beam upper end processing shape the same dovetail, dovetail protruding portion locate in the dovetail, and remain the dovetail rear portion clearance between dovetail protruding portion and the dovetail.

The end part of the dovetail-shaped protruding part is provided with a back hook structure, and the upper surface of the back hook structure is matched with the mounting surface of the dovetail groove through an inclined surface.

The angle of the inclined plane of the adjusting groove and the adjusting block which are matched to slide relatively is 30 degrees.

The central beam is provided with a stepped mounting hole, the adjusting block is arranged in the mounting hole, the screw is arranged in the mounting hole of the adjusting block, the screw is provided with a screw exhaust hole along the axial direction, and the adjusting block is provided with an adjusting block exhaust hole along the radial direction of the cross section; the screw is arranged in the adjusting block in a clearance way, and the exhaust hole of the adjusting block is communicated with the clearance; a clearance b is reserved between the adjusting block and the mounting surface at the step of the mounting hole of the central beam, and the exhaust hole of the adjusting block is communicated with the clearance b; the screw and the bottom of the central beam mounting hole are reserved with a gap a, and the screw exhaust hole is communicated with the gap a.

The hole diameters of the screw exhaust hole and the adjusting block exhaust hole are 1-5 mm.

The inner side opposite to the dovetail-shaped protruding part of each finger of the finger pair is provided with a finger pair front connecting pipe communicated with the cooling channel, and the two finger pair front connecting pipes in each finger pair are communicated through welding.

Two horizontal pipes, namely pipelines A and B, which are communicated with the internal cooling channel of the central beam are arranged on the side end surface of the central beam and are respectively used as an outlet and an inlet of the internal cooling channel of the central beam; the lower surface of each finger of the finger pair is provided with two inclined pipes which are communicated with the cooling channel, namely pipelines C and D; the pipeline A is communicated with the pipeline C, and the pipeline B is communicated with the pipeline D.

The pipeline A is communicated with the pipeline C through a pipe connecting piece, and the pipeline B is communicated with the pipeline D.

The outer diameter of the inclined tube, the horizontal tube and the finger to the front connecting tube is 15-20 mm, and the wall thickness of the tube is 2-3 mm.

The utility model discloses an effect as follows: the front part of the finger adopts a dovetail groove form, and the middle part adopts an adjustable structure and is connected with the central beam by using a screw. Meanwhile, two pipe openings, one inlet and one outlet, formed in the middle of a pair of fingers are communicated with a central beam cooling channel through pipe connectors, and the front parts of the 2 fingers in the finger pair are connected through pipes to form a cooling loop. The cooling channels of the central beam are designed around the cooling inlet and outlet pipes of the finger pair, and the inlet pipe and the outlet pipe are branched from the inlet manifold and the outlet manifold respectively to the finger pair. And when the finger pairs are disassembled, the pipe connecting pieces at the positions of the finger pairs and the inlet and outlet pipes are removed, the screws are disassembled, and the finger pairs can be taken out from the dovetail grooves. And (5) reversely operating during reinstallation, and finally welding the pipe connecting piece and the finger inlet and outlet pipe to finish the replacement of the finger pair. The design scheme has less integral welding seams of the central beam and the fingers, can realize the separation and combination of the fingers and the central beam for many times under the condition of not influencing the performance of the first wall, and has much simpler cutting separation and repair welding operation compared with the design scheme described in the background technology.

The structural connection mode of the fingers and the central beam is a pure mechanical connection mode, the dovetail groove at the front part is provided with an inclined plane which forms an angle of 30 degrees with the horizontal plane, the fingers are contacted with the central beam at the inclined plane, and gaps of not less than 1mm are kept on other surfaces. The finger middle adjusting block is provided with an inclined plane which forms an angle of 30 degrees with the horizontal plane, the adjusting block is contacted with the finger at the inclined plane, and gaps of not less than 1mm are kept on other surfaces. The back end face of the connecting part in the middle of the finger and the side end face of the central beam keep a gap of not less than 0.5 mm. Under the condition that the horizontal pipe connecting welding line and the inclined pipe connecting welding line in the middle of the finger are welded and contracted, the finger can slide on the inclined planes of the dovetail groove and the adjusting block (before the screw applies pretightening force), the relative position of the screw and the finger is adjusted, so that the screw can still be normally connected with the central beam, and the stress generated by welding deformation on the whole finger is avoided. The dovetail groove clamping structure and the middle adjustable screw structure are easy to detach and install.

In the prior art, each finger is welded with the central beam by 2 large-section welding seams of 42.5mm × 15mm, the welding deformation is large, and the defective finger (pair) can hardly be maintained and replaced under the condition of not influencing the central beam and other defect-free finger structures.

In the prior art, circular tubes are inserted into inner holes for welding and separating the cooling channels between the fingers and the central beam, the fingers and the central beam are partially damaged after separation, and repair welding cannot be performed. The cooling channel connected mode that the finger in this application is internal between 2 fingers, between central beam and the finger is outside pipe coupling, compares with the interior hole welding among the background art, has simplified the anterior inner chamber structure of finger, and does not have the welding apron outside the finger, has removed the deformation that is brought by the welding apron. The outer pipe welding, cutting separation and repair welding operations are simple, rapid and one-step forming, multiple operations can be performed, and the fingers can be replaced in the aspect of cooling channel connection.

In addition, with regard to the design of the screw and the adjusting block, the adjusting block not only provides a sliding slope for the fingers, but also the cylindrical feature at the front part of the adjusting block is inserted into the groove of the central beam to play a role in positioning the screw. The screw center has the through-hole, and the part that adjusting block did not insert the central beam has the through-hole, and both are the exhaust hole, and the purpose is because the gas that high temperature precipitated in the metal part in the inside confined space that the exhaust hole corresponds in order to discharge each, avoids inside to produce high pressure district. The hole diameter is preferably 2 mm.

After a welding process test, the pipe-pipe connecting pipeline preferably adopts the size of phi 19mm in outer diameter and 2.1mm in pipe wall thickness, and the balance between the quality guarantee of welding seams and the pressure resistance of pipe walls can be achieved.

Drawings

FIG. 1 is a schematic view of a connection configuration for plasma-facing components of a fusion reactor;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a front view of a connection structure for a plasma-facing component of a fusion reactor;

FIG. 4 is an enlarged view of a portion of the adjustment block of FIG. 3;

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a schematic view of a screw adjustment block connection;

FIG. 7 is a schematic view of an external tube arrangement;

in the figure: 1. a pair of fingers; 2. a center beam; 3. a connecting portion; 4. a side end face; 5. a lower surface; 6. an adjustment groove; 7. an adjusting block; 8. a screw; 9. a dovetail-shaped protrusion; 10. a dovetail groove; 11. a back hook structure; 12. a tube connector; 13. an inclined tube; 14. a horizontal tube; 15. a bevel; 16. screw exhaust holes; 17. an adjusting block exhaust hole; 18. the finger is connected with the front connecting pipe; 19. the back hook structure is matched with the dovetail groove inclined plane; 20. a dovetail groove rear gap.

Detailed Description

The present invention will be further explained with reference to the drawings and the detailed description.

As shown in fig. 1 to 3, the connection structure includes a finger pair 1 and a center beam 2 fixedly connected to the finger pair.

The finger pair 1 is mechanically connected to the central beam 2. A connecting part 3 extending downwards is processed at the same position of each lower finger surface 5 of the finger pair 1, the rear end surface of the connecting part 3 keeps a certain gap with the side end surface 4 of the center beam 2, an adjusting groove 6 is processed on the connecting part 3 along the transverse direction of the fingers, and the opening direction of the groove faces to the front of the connecting part 3. An adjusting block 7 is arranged in the adjusting groove 6, and the adjusting block 7, the connecting part 3 and the central beam 2 are fixed at proper positions through screws 8.

In order to further position the finger pair 1, a dovetail-shaped protruding part 9 extending downwards is processed on the lower surface of the finger pair 1, a dovetail groove 10 with the same shape is processed on the upper end of the central beam 2, the dovetail-shaped protruding part 9 is installed in the dovetail groove 10, the lower end part of the dovetail shape is designed with a back hook structure 11, the upper surface of the back hook structure is matched with the installation surface of the dovetail groove 10 through an inclined surface 19, and a dovetail groove rear gap 20 is reserved between the dovetail-shaped protruding part 9 and the dovetail groove 10.

As shown in fig. 4 and 5, the regulating groove 6 has a semicircular cross section, and the bottom is formed with a slope 15. The middle of the adjusting block 7 is provided with a screw hole, the lower end faces of the shoulders at the two ends are processed into inclined planes 15, the shoulders of the adjusting block 7 are positioned in the adjusting groove 6, a certain gap is reserved between the upper surface of the adjusting block 7 and the inner surface of the adjusting groove 6, and the upper surface of the adjusting block 7 and the inner surface of the adjusting groove are in contact fit through the inclined planes. In this embodiment, the bevel angle is 30 °.

The adjusting block 7 is fixed through the screw 8, the center beam 2 and the fingers are fixed to the center beam 1, the relative position of the fingers to the center beam 1 can be adjusted through the relative sliding of the inclined plane, even if the fingers to the center beam 1 incline at a certain angle due to the fact that the fingers generate a certain range of contraction amount through welding, the fingers are normally connected with the center beam 2 through the screw 8, when the adjusting block 7 moves through the inclined plane relative to the fingers, the rear gap 20 of the dovetail groove is designed, the relative positions of the fingers to the center beam 1 and the center beam 2 are adjusted, and then the fingers to the center beam 2 and the adjusting block 7 are fixedly connected through the screw 8.

In order to discharge gas generated by the metal parts due to high temperature and ensure reliable connection, vent hole structures are processed on the adjusting block 7 and the screw 8. As shown in fig. 6, a stepped mounting hole is formed in the center beam 2, in order to facilitate mounting of the screw 8 and the adjusting block 7, the screw 8 is mounted in the mounting hole of the adjusting block 7, the screw 8 is provided with a screw exhaust hole 16 along the axial direction, and the adjusting block 7 is provided with an adjusting block exhaust hole 17 along the radial direction of the section. The adjusting block exhaust hole 17 is communicated with the gap because the screw 8 is installed in the adjusting block 7 in the gap, and the adjusting block exhaust hole 17 is communicated with the gap b because the gap b is reserved between the adjusting block 7 and the installation surface at the step of the installation hole of the central beam 2. Since the screw 8 remains a gap a with the bottom of the mounting hole of the center sill 2, the screw exhaust hole 16 communicates with the gap a. In fact, as the adjusting block 7 is fixedly installed by the screw 8, the clearance a and the clearance b form a closed space

Besides the connection design of the mechanical mechanism, the cooling channel communication of the finger pair 1 is completely finished by external pipeline welding. As shown in fig. 1 and 7, finger pair front connection pipes 18 communicating with the cooling passages are installed at opposite inner sides of the dovetail-shaped protrusion 9 of each finger, and for each finger pair 1, the two finger pair front connection pipes 18 communicate by welding so that the cooling passages inside each finger of the finger pair 1 communicate. Two horizontal pipes 14, namely, pipes a and B, which are communicated with the internal cooling channel of the central beam 2 are welded on the side end surface 4 of the central beam 2, and respectively serve as an outlet and an inlet of the internal cooling channel of the central beam 2, and the pipe A, B is positioned below the connecting part 3 of the finger pair 1 which is in contact with the side end surface 4, and the two pipes A, B are positioned at the same horizontal level. Two inclined pipes 13, namely pipelines C and D, are arranged on the lower surface of each finger of the finger pair 1 and are respectively communicated with the cooling channels in the fingers, and the pipelines C and D are respectively used as outlets and inlets of the cooling channels in the finger pair 1. The pipe A and the pipe C are communicated with each other, and the pipe B and the pipe D are communicated with each other by a pipe joint 12.

The following cooling circuit is formed: the center beam cooling passage inlet (B) → the finger pair cooling passage inlet (D) → the single inter-finger cooling passage → the finger pair front connecting pipe 18 → the inter-finger cooling passage → the finger pair cooling water passage outlet (C) → the center beam cooling passage outlet (a).

The finger pair and the central beam are assembled and fixed, and the method comprises the following specific steps:

1. a pair of fingers is selected and assembled and the finger-to-front tube 18 welding is completed using a tube welder.

2. A pair of tube connectors 12 are welded to the coolant inlet and outlet nozzles (horizontal tubes 14, A, B) of the center beam using a tube welding machine at locations corresponding to the locations where finger pairs 1 will be mounted on the center beam 2 in step 1.

3. And (3) clamping the front parts of the finger pairs in the step (1) into a center beam dovetail groove 10, wherein the positions correspond to the installation positions of the pipe connecting pieces in the step (2).

4. An adjusting block 7 and a screw 8 are sequentially installed at the connecting part 3, and the screw is only screwed into the non-fixed adjusting block of the central beam and a finger.

5. The finger centering center inlet and outlet tube (chute 13, i.e., C, D) was welded to the tube connector in step 2 using a tube welder.

6. And (4) applying a certain pretightening force to the screw 8 in the step (4) to fix the adjusting block 7.

7. And (4) repeating the steps 1-6 to assemble 20 pairs of fingers, namely assembling the whole first wall fingers and the central beam.

The finger pair is detached and separated from the central beam, and the method comprises the following specific steps:

1. and (3) cutting off the weld joints of the finger pairs and the pipe connectors of the inlet and outlet pipes (the inclined pipes 13, namely C, D) in the step 5 of assembling and fixing the finger pairs and the central beam.

2. And the screw 8 and the adjusting block 7 in the middle of the finger are sequentially removed.

3. The finger fronts are removed from the center beam dovetail slots.

The disassembled fingers are assembled back to the central beam, and the method comprises the following specific steps:

1. and (3) cutting off the welding seams of the center beam and the pipe connecting piece in the step (2) of assembling and fixing the finger pairs and the center beam, and separating the pipe connecting pipes.

2. And (3) properly processing the pipe opening cutting of the central beam and the pipe opening cutting of the inlet and outlet pipe (the inclined pipe 13) by a finger to be reinstalled.

3. A pair of pipe connectors 12, both ends of which are adaptively lengthened, are welded to the coolant inlet and outlet pipes (horizontal pipes 14, i.e., A, B) of the center sill in step 1 using a pipe welding machine.

4. The front part of the finger to be reinstalled is clamped into the center beam dovetail groove 10, and the position corresponds to the installation position of the pipe connecting piece 12 in the step 3.

5. And the middle part of the finger pair is sequentially provided with an adjusting block and a screw, and the screw is only screwed into the unfixed adjusting block of the central beam and the finger.

6. The finger centering the middle inlet and outlet pipe (the inclined pipe 13, i.e. CD) is welded with the pipe connector 12 in step 3 using a pipe welder.

7. And (5) applying a certain pretightening force to the screw in the step 5 to fix the adjusting block.

Claims

1. A connection structure for a plasma-facing component of a fusion reactor, comprising a finger pair (1) and a center beam (2) fixedly connected with the finger pair (1), characterized in that: the lower surface (5) of each finger of the finger pair (1) is provided with a connecting part (3) extending downwards, a certain gap is reserved between the rear end surface of the connecting part (3) and the side end surface (4) of the central beam (2), the connecting part (3) is provided with an adjusting groove (6), an adjusting block (7) is arranged in the adjusting groove (6), and the adjusting block (7), the connecting part (3) and the central beam (2) are fixed through a screw (8); the adjusting groove (6) and the adjusting block (7) slide relatively through the inclined plane matching, and a certain gap is formed between the upper surface of the adjusting block (7) and the inner surface of the adjusting groove (6).

2. A connection structure for plasma-facing components of a fusion reactor as claimed in claim 1, wherein: each finger lower surface (5) in the finger pair (1) be equipped with downwardly extending's dovetail protruding portion (9), central roof beam (2) upper end processing shape the same dovetail (10), dovetail protruding portion (9) locate in dovetail (10), and remain dovetail rear portion clearance (20) between dovetail protruding portion (9) and dovetail (10).

3. A connection structure for plasma-facing components of a fusion reactor as claimed in claim 2, wherein: the end part of the dovetail-shaped protruding part (9) is provided with a back hook structure (11), and the upper surface of the back hook structure (11) is matched with the mounting surface of the dovetail groove (10) through an inclined surface (19).

4. A connection structure for plasma-facing components of a fusion reactor as claimed in claim 1, wherein: the angle of the inclined plane of the adjusting groove (6) and the adjusting block (7) which are matched to slide relatively is 30 degrees.

5. A connection structure for plasma-facing components of a fusion reactor as claimed in claim 1, wherein: the central beam (2) is provided with a step-shaped mounting hole, the adjusting block (7) is arranged in the mounting hole, the screw (8) is arranged in the mounting hole of the adjusting block (7), the screw (8) is provided with a screw exhaust hole (16) along the axial direction, and the adjusting block (7) is provided with an adjusting block exhaust hole (17) along the section radial direction; the screw (8) is installed in the adjusting block (7) in a clearance way, and the adjusting block exhaust hole (17) is communicated with the clearance way; a clearance b is reserved between the adjusting block (7) and the mounting surface at the mounting hole step of the central beam (2), and an adjusting block exhaust hole (17) is communicated with the clearance b; a gap a is reserved between the screw (8) and the bottom of the mounting hole of the central beam (2), and the screw exhaust hole (16) is communicated with the gap a.

6. A connection structure for plasma-facing components of a fusion reactor as claimed in claim 5, wherein: the hole diameters of the screw exhaust hole (16) and the adjusting block exhaust hole (17) are 1-5 mm.

7. A connection structure for plasma-facing components of a fusion reactor as claimed in claim 1, wherein: the inner side opposite to the dovetail-shaped protruding part (9) of each finger of the finger pair (1) is provided with a finger pair front connecting pipe (18) communicated with the cooling channel, and the two finger pair front connecting pipes (18) in each finger pair (1) are communicated through welding.

8. A connection structure for plasma-facing components of a fusion reactor as claimed in claim 7, wherein: two horizontal pipes (14) communicated with the internal cooling channel of the central beam (2), namely a pipeline A and a pipeline B, are arranged on the side end surface (4) of the central beam (2) and are respectively used as an outlet and an inlet of the internal cooling channel of the central beam (2); the lower surface of each finger of the finger pair (1) is provided with two inclined pipes (13) communicated with the cooling channel, namely pipelines C and D; the pipeline A is communicated with the pipeline C, and the pipeline B is communicated with the pipeline D.

9. A connection structure for plasma-facing components of a fusion reactor as claimed in claim 8, wherein: the pipeline A is communicated with the pipeline C through a pipe connector (12), and the pipeline B is communicated with the pipeline D.

10. A connection structure for plasma-facing components of a fusion reactor as claimed in claim 8, wherein: the outer diameter of the inclined tube (13), the horizontal tube (14) and the finger to the front connecting tube (18) is 15-20 mm, and the wall thickness of the tube is 2-3 mm.