Test piece clamping unit and plum blossom type remountable irradiation test assembly

Abstract

The invention relates to the technical field of research reactor irradiation, and provides a test piece clamping unit and a plum blossom type remountable irradiation test assembly, the clamping unit comprises a plurality of clamping pieces, the two ends of the clamping piece are provided with clamping parts, the clamping parts are provided with clamping blind holes used for clamping test pieces, the test pieces are clamped between two adjacent clamping pieces, and the clamping blind holes are used for clamping the test pieces. The side wall of the clamping blind hole is provided with a first elastic piece used for providing radial pre-tightening force, and the bottom of the clamping blind hole is provided with a second elastic piece used for providing axial pre-tightening force. Each clamping piece is provided with at least two pull rod holes penetrating through the two ends, and the pull rods are arranged in the pull rod holes of the adjacent clamping parts of the two adjacent clamping pieces in a penetrating mode; and the plurality of fixing pieces are arranged between the two clamping parts of the clamping piece and are connected with the end part of the pull rod. Compared with the prior art, not only can test pieces be loaded in batches, but also each test piece is ensured to have radial pre-tightening force and axial pre-tightening force.

Description

Technical Field

[0001] The present invention relates to the field of research reactor irradiation technology, and in particular to a test piece clamping unit and a plum blossom type reinstallable irradiation test assembly. Background Art

[0002] Fuel elements are the smallest components of fuel assemblies. Before the fuel assemblies are used in engineering, they must be subjected to in-pile irradiation tests and performance tests to comprehensively evaluate their radiation resistance and provide key experimental data and performance verification basis for design and development. Depending on the stage of fuel assembly development, different levels of in-pile irradiation tests are required. Generally, the last step of verification is the component-level irradiation test to verify the structural strength, thermal performance, hydraulic performance, compatibility, operability, radiation resistance, corrosion resistance, etc. of the fuel assemblies, obtain reliable operation data, and provide a basis for engineering applications.

[0003] The irradiation test assembly is generally a scaled-down fuel assembly. In the research reactor, the fuel element is used as a test piece and needs to be clamped and fixed by a clamping unit to ensure the requirements of high temperature and high pressure, flow-induced vibration, flow velocity matching, etc. during the test. For example, the patent document with the publication number "CN110580961A" provides a clamping and fixing method for a rod-shaped test piece to meet the above requirements. However, this prior art can only be applied to the clamping and fixing of a single test piece, and cannot be applied to batch loading of test pieces. Summary of the invention

[0004] The object of the present invention is to provide a test piece clamping unit and a plum blossom type reinstallable radiation test assembly to solve the above-mentioned defects of the prior art.

[0005] The present invention is achieved through the following technical solutions:

[0006] A test piece clamping unit, comprising:

[0007] A plurality of clamping members, both ends of which are provided with clamping parts, the clamping parts are provided with clamping blind holes for clamping the test piece, the test piece is clamped between two adjacent clamping members, the side walls of the clamping blind holes are provided with first elastic members for providing radial preload, and the bottoms of the clamping blind holes are provided with second elastic members for providing axial preload;

[0008] A plurality of pull rods, the clamping piece is provided with at least two pull rod holes penetrating through both ends, and the pull rods are inserted into the pull rod holes of adjacent clamping parts of two adjacent clamping pieces;

[0009] A plurality of fixing members are arranged between the two clamping parts of the clamping member and connected with the ends of the pull rod.

[0010] Optionally, the clamping blind holes of one or more of the clamping members located in the middle are replaced by clamping through holes, and the side walls of the clamping through holes are also provided with the first elastic member.

[0011] Optionally, the fixing member is a threaded cylinder, which is connected to the pull rod by threads.

[0012] Optionally, the first elastic member is a leaf spring, and the second elastic member is a disc spring.

[0013] Optionally, a gasket is provided at one end of the second elastic member contacting the test piece.

[0014] The present invention also provides a plum blossom type reinstallable radiation test assembly, comprising any one of the above-mentioned clamping units, and further comprising a center rod, a lower tube seat and a locking component, wherein the lower tube seat is fixedly connected to the lower end of the center rod;

[0015] Each clamping piece in the clamping unit is fan-shaped, and a wedge-shaped clamping block is provided on one side of the clamping piece, a wedge-shaped clamping groove is provided on the other side of the clamping piece, and a notch is provided on one side of the clamping blind hole to pass through both ends of the clamping piece, so that the clamping piece has elasticity. Each clamping unit is assembled by the wedge-shaped clamping block and the wedge-shaped clamping groove to form a cylindrical clamping whole, and a mounting hole is formed in the center of the clamping whole, and the clamping whole is sleeved on the center rod through the mounting hole and supported by the lower pipe seat;

[0016] The locking component is arranged at the upper end of the center rod and is used for locking and clamping the whole.

[0017] Optionally, the cross-section of the portion of the center rod on which the clamping unit is sleeved is perpendicular to the axis and is in a polygonal structure, and the mounting hole can limit the rotation of the center rod and a gap is reserved as a cooling channel.

[0018] Optionally, the locking component includes an upper tube seat, a lock core and a pressing seat; the portion of the central rod sleeved with the clamping unit is defined as a mounting section, a limiting boss is provided above the mounting section, a cross section of the limiting boss perpendicular to the axis is a polygonal structure, and the central rod is a bare rod section between the mounting section and the limiting boss;

[0019] The upper tube seat is sleeved on the mounting section and is provided with a support step for supporting the lock core. The distance between the limiting boss and the support step is equal to the length of the lock core. The lock core is provided with an inner hole that can cooperate with the limiting boss. After the lock core is inserted into the support step, it is rotated to a target angle so that the limiting boss limits the axial displacement of the lock core and the clamp as a whole.

[0020] The cross section of the lock core perpendicular to the axis is a polygonal structure, and a step anti-rotation hole is provided inside the clamping seat. The small diameter section of the step anti-rotation hole cooperates with the limiting boss, and the large diameter section of the step anti-rotation hole cooperates with the lock core.

[0021] The technical solution of the present invention has at least the following advantages and beneficial effects: In the present invention, a plurality of clamping members are provided, and adjacent clamping members are connected by a pull rod and a fixing member to form a clamping member, and each clamping unit can load multiple test pieces; at the same time, the first elastic member provides a radial preload force for the test piece to buffer radial vibration and impact load, and the second elastic member provides an axial preload force for the test piece to buffer axial vibration and impact load. It can be seen that compared with the prior art, the present invention can not only load test pieces in batches, but also ensure that each test piece has radial preload force and axial preload force. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A front view of a test piece clamping unit provided in Example 1;

[0024] Figure 2 for Figure 1 A magnified image of point A;

[0025] Figure 3 A schematic structural diagram of a test piece clamping unit provided in Example 1;

[0026] Figure 4 Schematic diagram of the structure of the clamping part

[0027] Figure 5 is a cross-sectional view of the clamping member;

[0028] Figure 6 is a top view of the clamping member (the first elastic member and the second elastic member are hidden);

[0029] Figure 7 A schematic diagram of the structure of a plum blossom type reinstallable irradiation test assembly provided in Example 3;

[0030] Figure 8 A partial cross-sectional view of a plum blossom-shaped reinstallable irradiation test assembly provided in Example 3;

[0031] Fig. 9 for Figure 8 The enlarged view of point B;

[0032] Fig.10 for Fig. 9 CC section view;

[0033] Fig.11It is the front view of the center rod;

[0034] Fig.12 It is the front view of the upper tube seat;

[0035] Fig.13 for Fig.12 DD cross-sectional view;

[0036] Fig.14 It is the front view of the lock cylinder;

[0037] Fig.15 for Fig.14 EE cross-sectional view;

[0038] Fig.16 It is a structural schematic diagram of the pressing seat;

[0039] Icons: 100-clamping unit, 101-clamping part, 1011-clamping blind hole, 1012-notch, 1013-wedge-shaped block, 1014-wedge-shaped slot, 102-pull rod, 103-fixing part, 104-first elastic part, 105-second elastic part, 106-cooling channel, 200-center rod, 201-installing section, 202-limiting boss, 300-lower tube seat, 400-locking part, 401-upper tube seat, 4011-support step, 402-lock core, 403-pressure seat, 4031-small diameter section, 4032-large diameter section, 500-test piece. DETAILED DESCRIPTION

[0040] Example 1

[0041] refer to Figure 1-Figure 5 A test piece 500 clamping unit 100 includes a plurality of clamping members 101 , a plurality of pull rods 102 and a plurality of fixing members 103 .

[0042] The two ends of the clamping member 101 are provided with clamping parts, and the clamping parts are provided with clamping blind holes 1011 for clamping the test piece 500. The test piece 500 is clamped between two adjacent clamping members 101, that is, the two ends of the test piece 500 are placed in the clamping blind holes 1011. The clamping member 101 is provided with at least two tie rod 102 holes running through the two ends, and the tie rod 102 is passed through the tie rod 102 holes of the adjacent clamping parts of the two adjacent clamping members 101. It is easy to understand that the two adjacent clamping members 101 can only be restricted from relative rotation by at least two tie rods 102. As an option, the clamping member 101 of this embodiment is only provided with two tie rod 102 holes, that is, two tie rods 102 are passed through the two adjacent clamping members 101.

[0043] The fixing member 103 is arranged between the two clamping parts of the clamping member 101 and connected to the end of the pull rod 102. As an option, the fixing member 103 of this embodiment is a threaded cylinder, the end of the pull rod 102 is provided with a thread, and the fixing member 103 and the pull rod 102 are connected by threads. It is easy to understand that in some embodiments, one fixing member 103 can be arranged between the two clamping parts of a clamping member 101, and the fixing member 103 is connected to two adjacent pull rods 102 at the same time; in other embodiments, of course, two fixing members 103 can also be arranged between the two clamping parts of a clamping member 101, that is, the adjacent ends of two adjacent pull rods 102 are each connected by one fixing.

[0044] Each of the above-mentioned clamping units 100 can be loaded with multiple test pieces 500. As an option, the present embodiment has nine clamping members 101, which can load eight layers of test pieces 500, one test piece 500 per layer, for a total of eight pieces. Of course, in other embodiments, the number of clamping members 101 in a clamping unit 100 can also be set to other numbers to load other numbers of test pieces 500.

[0045] The side wall of the blind hole is provided with a first elastic member 104, which provides radial preload for the test piece 500, realizes radial elastic support and positioning of the test piece 500, and is used to buffer radial vibration and impact load, and buffer flow-induced vibration of the test piece 500 under the hydraulic flushing of the circuit. As an option, the first elastic member 104 of this embodiment selects a leaf spring, which can be divided into a straight leaf spring and a bent leaf spring according to the shape. This embodiment uses a bent leaf spring, which can be fixed by resistance welding or laser welding.

[0046] A second elastic member 105 is provided at the bottom of the clamping blind hole 1011. The second elastic member 105 provides an axial preload for the test piece 500, and is used to buffer axial vibration and impact load, and buffer the flow-induced vibration of the test piece 500 under the hydraulic flushing of the circuit. As an option, the second elastic member 105 of this embodiment is a disc spring. Furthermore, since the disc spring has a large stiffness, in order to prevent local point contact from causing damage to the end of the test piece 500, a gasket is provided at the end of the second elastic member 105 that contacts the test piece 500.

[0047] Example 2

[0048] The difference between this embodiment and embodiment 1 is that in this embodiment, the clamping blind holes 1011 of one or more clamping members 101 in the middle are replaced with clamping through holes. This arrangement enables the clamping unit 100 to clamp test pieces 500 of different lengths.

[0049] For the sake of convenience, the clamping member 101 provided with the clamping through hole is defined as an intermediate clamping member. If the test piece 500 loaded in the first embodiment is defined as a short test piece 500, the present embodiment can not only load the short test piece 500, but also load the long test piece 500 whose length is greater than the short test piece 500. In practical applications, for example, the clamping blind holes 1011 in the second to fourth clamping members 101 from top to bottom in the first embodiment are replaced with intermediate clamping members, and the long test piece 500 of the present embodiment is clamped between the first clamping member 101 and the fifth clamping member 101, that is, the clamping unit 100 provided in the present embodiment can carry one long test piece 500 and four short test pieces 500. The side wall of the clamping through hole of the intermediate clamping member is also provided with a first elastic member 104, that is, the intermediate clamping member only provides radial support and does not apply preload force in the axial direction.

[0050] Example 3

[0051] refer to Figure 7 and Figure 8 This embodiment provides a plum blossom type reinstallable irradiation test assembly, including a plurality of clamping units 100. As an option, this embodiment includes five clamping units 100 provided in Embodiment 1, which are loaded with a total of four short test pieces 500. It is easy to understand that in other embodiments, the clamping units 100 provided in Embodiment 2 can also be used to form the test assembly, and the number of the clamping units 100 can also be other numbers.

[0052] On the basis of the above, the test assembly further includes a center rod 200 , a lower tube seat 300 and a locking component 400 .

[0053] Each clamping member 101 in the clamping unit 100 is fan-shaped, referring to Fig.10 and Fig.12 A wedge-shaped block 1013 is provided on one side of the clamping member 101, and a wedge-shaped slot 1014 is provided on the other side of the clamping member 101. The five clamping units 100 are assembled by the wedge-shaped block 1013 and the wedge-shaped slot 1014 to form a cylindrical clamping body, and the cross section of the clamping body perpendicular to the axis is plum blossom-shaped. A notch 1012 is provided on one side of the clamping blind hole 1011, which runs through both ends of the clamping member 101, so that the clamping member 101 has elasticity, that is, when the clamping member 101 is squeezed, the size of the notch 1012 can be reduced to ensure that the five clamping units 100 can be smoothly assembled together.

[0054] The lower tube seat 300 is fixedly connected to the lower end of the center rod 200; when the five clamping units 100 are combined to form a clamping whole, a mounting hole is formed at the center of the clamping whole at the same time, and the clamping whole is sleeved on the center rod 200 through the mounting hole and supported by the lower tube seat 300; further, the part of the center rod 200 sleeved with the clamping whole is defined as a mounting section 201, and the cross-section of the mounting section 201 perpendicular to the axis is a polygonal structure, and the mounting hole can limit the rotation of the center rod 200 and a gap is reserved as a cooling channel 106, reference Fig.10 On this basis, each clamping member 101 of the present embodiment is in an arc shape near the center of the clamping body, that is, the mounting hole is composed of five arc segments, each arc segment is tangent to the corresponding side of the mounting segment 2012, so that the rotation of the center rod 200 is limited and there is a gap to serve as a cooling channel 106.

[0055] The locking member 400 is disposed at the upper end of the center rod 200 and is used to lock and clamp the entire structure. Fig. 9 , Figure 11-Figure 16 In this embodiment, the locking component 400 includes an upper tube seat 401, a lock core 402 and a pressing seat 403. A limiting boss 202 is provided above the mounting section 201 of the center rod 200. The center rod 200 is a bare rod section between the mounting section 201 and the limiting boss 202.

[0056] The upper tube seat 401 is sleeved on the mounting section 201, that is, the upper tube seat 401 is provided with a hole that cooperates with the mounting section 201, and the interior of the upper tube seat 401 is provided with a supporting step 4011 for supporting the lock core 402, and the distance between the limiting boss 202 and the supporting step 4011 is equal to the length of the lock core 402, and the cross-section of the limiting boss 202 perpendicular to the axis is a polygonal structure (as an option, this embodiment is a regular pentagonal structure), and the interior of the lock core 402 is provided with an inner hole that can cooperate with the limiting boss 202. After the lock core 402 is inserted into the supporting step 4011, it is just aligned with the light rod section, and then rotated to the target angle, under the action of the limiting boss 202, the axial displacement of the lock core 402 and the clamping unit 100 is limited.

[0057] The cross section of the lock core 402 perpendicular to the axis is also a polygonal structure (as an option, this embodiment is also a regular pentagonal structure), and a step anti-rotation hole is provided inside the pressing seat 403. The small diameter section 4031 of the step anti-rotation hole cooperates with the limiting boss 202, and the large diameter section 4032 of the step anti-rotation hole cooperates with the lock core 402. In this way, the pressing seat 403 cannot rotate relative to the center rod 200, and the lock core 402 cannot rotate relative to the pressing seat 403, thereby achieving a locking function. Furthermore, in actual applications, a locking nut (not shown) can also be provided on the pressing seat 403, and the locking nut is connected to the center rod 200 by threads, thereby limiting the axial position of the pressing seat 403.

[0058] In addition, it should be understood that the upper tube seat 401 , the pressing seat 403 and the lower tube seat 300 should all be provided with corresponding holes as coolant circulation channels to facilitate the coolant to enter the above-mentioned cooling channel 106 .

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A test piece clamping unit, characterized in that: include: A plurality of clamping members, both ends of which are provided with clamping parts, the clamping parts are provided with clamping blind holes for clamping the test piece, the test piece is clamped between two adjacent clamping members, the side walls of the clamping blind holes are provided with first elastic members for providing radial preload, and the bottoms of the clamping blind holes are provided with second elastic members for providing axial preload; A plurality of pull rods, the clamping piece is provided with at least two pull rod holes penetrating through both ends, and the pull rods are inserted into the pull rod holes of adjacent clamping parts of two adjacent clamping pieces; A plurality of fixing members are arranged between the two clamping parts of the clamping member and connected with the ends of the pull rod.

2. The test piece clamping unit according to claim 1, characterized in that: The clamping blind holes of one or more clamping members located in the middle are replaced by clamping through holes, and the side walls of the clamping through holes are also provided with the first elastic member.

3. The test piece clamping unit according to claim 1, characterized in that: The fixing piece is a threaded cylinder, which is connected to the pull rod through threads.

4. The test piece clamping unit according to claim 1, characterized in that: The first elastic member is a leaf spring, and the second elastic member is a disc spring.

5. The test piece clamping unit according to claim 1, characterized in that: A gasket is provided at one end of the second elastic member contacting the test member.

6. A plum blossom type reinstallable irradiation test assembly, characterized in that: A clamping unit comprising any one of claims 1 to 5, characterized in that it further comprises a center rod, a lower tube seat and a locking component, wherein the lower tube seat is fixedly connected to the lower end of the center rod; Each clamping piece in the clamping unit is fan-shaped, and a wedge-shaped clamping block is provided on one side of the clamping piece, a wedge-shaped clamping groove is provided on the other side of the clamping piece, and a notch is provided on one side of the clamping blind hole to pass through both ends of the clamping piece, so that the clamping piece has elasticity. Each clamping unit is assembled by the wedge-shaped clamping block and the wedge-shaped clamping groove to form a cylindrical clamping whole, and a mounting hole is formed in the center of the clamping whole, and the clamping whole is sleeved on the center rod through the mounting hole and supported by the lower pipe seat; The locking component is arranged at the upper end of the center rod and is used for locking and clamping the whole.

7. The plum blossom type reinstallable radiation test assembly according to claim 6, characterized in that: The cross section of the portion of the central rod sleeved with the clamping unit perpendicular to the axis is a polygonal structure, and the mounting hole can limit the rotation of the central rod and a gap is reserved as a cooling channel.

8. The plum blossom type reinstallable radiation test assembly according to claim 6, characterized in that: The locking component includes an upper tube seat, a lock core and a pressing seat; the portion of the central rod sleeved with the clamping unit is defined as a mounting section, a limiting boss is provided above the mounting section, and the cross section of the limiting boss perpendicular to the axis is a polygonal structure, and the central rod is a bare rod section between the mounting section and the limiting boss; The upper tube seat is sleeved on the mounting section and is provided with a support step for supporting the lock core. The distance between the limiting boss and the support step is equal to the length of the lock core. The lock core is provided with an inner hole that can cooperate with the limiting boss. After the lock core is inserted into the support step, it is rotated to a target angle so that the limiting boss limits the axial displacement of the lock core and the clamp as a whole. The cross section of the lock core perpendicular to the axis is a polygonal structure, and a step anti-rotation hole is provided inside the clamping seat. The small diameter section of the step anti-rotation hole cooperates with the limiting boss, and the large diameter section of the step anti-rotation hole cooperates with the lock core.

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