1. The utility model provides a neutron fluence and deformation measuring device in experimental reactor which characterized in that includes: the testing device comprises an external shell, a clamping assembly, a neutron fluence measuring assembly and a deformation measuring assembly, wherein a testing plate is arranged in the clamping assembly, the clamping assembly and the deformation measuring assembly are both arranged in the external shell, and the neutron fluence measuring assembly is fixedly connected with the clamping assembly;

the clamping assembly comprises a clamping block and a fixing assembly, one end of the clamping block is provided with a strip-shaped deep groove matched with the test plate, and the test plate is fixed in the strip-shaped deep groove through the fixing assembly;

the deformation measuring component comprises a fixed structure, a transmission component and a displacement sensor, the displacement sensor is fixedly connected with the fixed structure, and the measuring end of the displacement sensor is used for measuring the deformation of the test board through the transmission component.

2. The device for measuring neutron fluence and deformation in a test reactor according to claim 1, wherein one end of the deformation measuring component relative to the clamping block is set as the upper end of the clamping block, and the other end of the clamping block is set as the lower end of the clamping block;

the strip-shaped deep groove is formed in the upper end of the clamping block, and the lower end face of the test plate is attached to the lower end face of the strip-shaped deep groove;

the fixing assembly comprises a plurality of elastic fixing pieces, the outer ends of the elastic fixing pieces are fixedly connected with the clamping blocks, and the inner ends of the elastic fixing pieces are abutted against the side face of the test board and provide prestress towards the test board.

3. The device for measuring neutron fluence and deformation in a test reactor according to claim 2, wherein a plurality of threaded through holes are arranged on the clamping block and are respectively perpendicular to the side surface of the strip-shaped deep groove;

the elastic fixing piece comprises a thread section and a spring section, the inner end of the thread section of the elastic fixing piece is fixedly connected with the outer end of the spring section of the elastic fixing piece, the thread section of the elastic fixing piece is connected with the thread through hole in a threaded manner, and the inner end of the spring section of the elastic fixing piece is abutted against the side face of the test board.

4. The apparatus of claim 3, wherein the neutron fluence and deformation measurement apparatus comprises a neutron source,

the other four sides of the test panel were set to be in the order: a first side, a second side, a third side, and a fourth side;

setting the other four side surfaces of the strip-shaped deep groove to be sequentially: a first medial side, a second medial side, a third medial side, and a fourth medial side;

the threaded through holes are formed in the third inner side face and the fourth inner side face;

when the test board is fixed in the strip-shaped deep groove, the first side face is attached to the first inner side face, the second side face is attached to the second inner side face, the elastic fixing piece arranged on the third inner side face applies prestress to the test board along the third side face towards the first side face, and the elastic fixing piece arranged on the fourth inner side face applies prestress to the test board along the fourth side face towards the second side face.

5. The device for measuring neutron fluence and deformation in a test reactor according to claim 1, wherein the fixing structure comprises a fixing block, a threaded shaft and a blocking piece, a placing hole for placing the displacement sensor is formed in the fixing block, a threaded hole communicated with the outside of the fixing block is formed in the side wall of the placing hole, the threaded shaft is in threaded connection with the threaded hole, the inner end of the threaded shaft is connected with the outer side face of the blocking piece, the inner side face of the blocking piece abuts against the outer side face of the displacement sensor arranged in the placing hole, and the outer side face of the fixing block is fixedly connected with the outer shell.

6. The device for measuring neutron fluence and deformation in a test reactor according to claim 5, wherein the transmission assembly comprises a clamping block, a transmission rod, a transmission frame and a deformation transmission rod, the clamping block is fixedly connected with the upper end of the test plate, the lower end of the transmission rod is fixedly connected with the clamping block, the transmission frame is arranged in parallel with the upper end face of the clamping block and is fixedly connected with the upper end of the transmission rod, a strip-shaped hole is formed in the transmission frame, the deformation transmission rod penetrates through the strip-shaped hole and is vertically arranged on the upper end face of the test plate, the deformation transmission rod is provided with an outer nut, the deformation transmission rod passes through a nut and is fixedly connected with the transmission frame, the measuring end of the displacement sensor is correspondingly arranged at the upper end of the deformation transmission rod, and the displacement of the deformation transmission rod is measured.

7. The device for measuring neutron fluence and deformation in a test reactor according to claim 6, wherein the number of the placing holes, the displacement sensors and the deformation transmission rods is three and the placing holes, the displacement sensors and the deformation transmission rods are distributed in a triangular shape.

8. The apparatus of claim 1, wherein the neutron fluence and deformation measurement assembly comprises a neutron detector box, a detection rod clamping block and a neutron detection rod, the upper end face of the clamping block is provided with at least four detection holes, and the detection rod clamping block wraps the neutron detection rod and is inserted into the detection holes;

the side of clamp splice is provided with the rectangular channel, two neutron detector box all sets up in the rectangular channel, and be located respectively the both ends of clamp splice, two be provided with between the neutron detector and fill up the piece.

9. The apparatus of claim 6, wherein the outer casing comprises:

the clamping assembly and the deformation measuring assembly are fixed in the irradiation tank through the filling assembly;

the squirrel cage is characterized by comprising a positioning flange, a squirrel cage is fixedly connected to a first end face of the positioning flange, an air outlet pipe communicated with the inside of the squirrel cage is arranged on the squirrel cage, a transition pipe and a protection pipe are sequentially arranged between a second end face of the positioning flange and the upper cover plate, the squirrel cage, the transition pipe, the protection pipe and the irradiation tank are communicated with each other, and through holes which are used for the air inlet pipe to pass through are formed in the upper cover plate, the transmission frame, the clamping blocks and the fixing blocks.

10. The device for measuring neutron fluence and deformation in a test reactor according to claim 9, wherein the filling assembly comprises a lower cushion block, an upper support block, an elastic assembly and an upper cushion block, the lower cushion block is arranged between the lower end surface of the clamping assembly and the lower cover plate, and the upper cushion block, the elastic assembly and the upper support block are sequentially arranged between the upper cover plate and the upper end surface of the deformation measurement assembly;

the elastic assembly comprises a baffle, an elastic support and an elastic piece, two ends of the elastic support are respectively fixedly connected with the baffle and the elastic piece, and the baffle and the elastic piece are arranged in parallel with the lower cover plate.

Background

The method for detecting the deformation and the neutron fluence of the material after irradiation is an important means for verifying the performance of the material, and has important significance for understanding the internal mechanisms of various irradiation effects of the material in the irradiation process and the research and development of new materials. In the traditional mode, the neutron fluence of the material is mainly measured by the neutron detection piece, the neutron detection piece is placed in the device when the sample device is assembled, the device is disassembled and cut after being piled, and the neutron detection piece is taken out for detection. The deformation of the material is mainly detected by disintegration and cutting in a hot chamber after irradiation. The traditional method has higher accuracy, but does not disclose the change process of the irradiation sample in the irradiation process, does not reflect the irradiation condition of the material in the reactor in real time, and the mechanical property detection after irradiation can not truly reflect the influence of the irradiation process on the irradiation sample.

Disclosure of Invention

The invention aims to solve the problems and provide a neutron fluence and deformation measuring device in a test reactor.

A neutron fluence and deformation measuring device in a test reactor comprises: the testing device comprises an external shell, a clamping assembly, a neutron fluence measuring assembly and a deformation measuring assembly, wherein a testing plate is arranged in the clamping assembly, the clamping assembly and the deformation measuring assembly are both arranged in the external shell, and the neutron fluence measuring assembly is fixedly connected with the clamping assembly;

the clamping assembly comprises a clamping block and a fixing assembly, one end of the clamping block is provided with a strip-shaped deep groove matched with the test plate, and the test plate is fixed in the strip-shaped deep groove through the fixing assembly;

the deformation measuring component comprises a fixed structure, a transmission component and a displacement sensor, the displacement sensor is fixedly connected with the fixed structure, and the measuring end of the displacement sensor is used for measuring the deformation of the test board through the transmission component.

Specifically, one end of the deformation measuring component, which is opposite to the clamping block, is set as the upper end of the clamping block, and the other end of the clamping block is set as the lower end of the clamping block;

the strip-shaped deep groove is formed in the upper end of the clamping block, and the lower end face of the test plate is attached to the lower end face of the strip-shaped deep groove;

the fixing assembly comprises a plurality of elastic fixing pieces, the outer ends of the elastic fixing pieces are fixedly connected with the clamping blocks, and the inner ends of the elastic fixing pieces are abutted against the side face of the test board and provide prestress towards the test board.

Specifically, a plurality of threaded through holes which are respectively vertical to the side surfaces of the strip-shaped deep grooves are formed in the clamping block;

the elastic fixing piece comprises a thread section and a spring section, the inner end of the thread section of the elastic fixing piece is fixedly connected with the outer end of the spring section of the elastic fixing piece, the thread section of the elastic fixing piece is connected with the thread through hole in a threaded manner, and the inner end of the spring section of the elastic fixing piece is abutted against the side face of the test board.

Preferably, the other four sides of the test plate are set as follows: a first side, a second side, a third side, and a fourth side;

setting the other four side surfaces of the strip-shaped deep groove to be sequentially: a first medial side, a second medial side, a third medial side, and a fourth medial side;

the threaded through holes are formed in the third inner side face and the fourth inner side face;

when the test board is fixed in the strip-shaped deep groove, the first side face is attached to the first inner side face, the second side face is attached to the second inner side face, the elastic fixing piece arranged on the third inner side face applies prestress to the test board along the third side face towards the first side face, and the elastic fixing piece arranged on the fourth inner side face applies prestress to the test board along the fourth side face towards the second side face.

Specifically, fixed knot constructs including fixed block, threaded shaft and separation blade, be provided with on the fixed block and be used for placing displacement sensor's the hole of placing, the lateral wall of placing the hole be provided with the screw hole of the outside intercommunication of fixed block, the threaded shaft with screw hole threaded connection, just the inner of threaded shaft with the lateral surface of separation blade is connected, the medial surface and the setting of separation blade are in place downthehole displacement sensor's lateral surface and support and lean on, the lateral surface of fixed block with outside casing fixed connection.

Specifically, drive assembly includes grip block, transfer line, driving frame and deformation transfer bar, the grip block with the upper end fixed connection of test panel, the lower extreme of transfer line with grip block fixed connection, the driving frame with the up end parallel arrangement of grip block and with the upper end fixed connection of transfer line, be provided with the bar hole on the driving frame, the deformation transfer bar passes the bar hole with the up end of test panel sets up perpendicularly, the deformation transfer bar is provided with outer nut, just the deformation transfer bar pass through the nut with driving frame fixed connection, displacement sensor's measuring end with the upper end of deformation transfer bar corresponds the setting, and measures the displacement volume of deformation transfer bar.

Preferably, the number of the placing holes, the number of the displacement sensors and the number of the deformation transmission rods are three, and the three deformation transmission rods are distributed in a triangular shape.

Specifically, the neutron fluence measurement assembly comprises a neutron detector box, a detection rod clamping block and a neutron detection rod, wherein at least four detection holes are formed in the upper end face of the clamping block, and the detection rod clamping block wraps the neutron detection rod and is inserted into the detection holes;

the side of clamp splice is provided with the rectangular channel, two neutron detector box all sets up in the rectangular channel, and be located respectively the both ends of clamp splice, two be provided with between the neutron detector and fill up the piece.

Specifically, the outer case includes:

the clamping assembly and the deformation measuring assembly are fixed in the irradiation tank through the filling assembly;

the squirrel cage is characterized by comprising a positioning flange, a squirrel cage is fixedly connected to a first end face of the positioning flange, an air outlet pipe communicated with the inside of the squirrel cage is arranged on the squirrel cage, a transition pipe and a protection pipe are sequentially arranged between a second end face of the positioning flange and the upper cover plate, the squirrel cage, the transition pipe, the protection pipe and the irradiation tank are communicated with each other, and through holes which are used for the air inlet pipe to pass through are formed in the upper cover plate, the transmission frame, the clamping blocks and the fixing blocks.

Specifically, the filling assembly comprises a lower cushion block, an upper supporting block, an elastic assembly and an upper cushion block, the lower cushion block is arranged between the lower end face of the clamping assembly and the lower cover plate, and the upper cushion block, the elastic assembly and the upper supporting block are sequentially arranged between the upper cover plate and the upper end face of the deformation measuring assembly;

the elastic assembly comprises a baffle, an elastic support and an elastic piece, two ends of the elastic support are respectively fixedly connected with the baffle and the elastic piece, and the baffle and the elastic piece are arranged in parallel with the lower cover plate.

Compared with the prior art, the neutron fluence measurement assembly and the deformation measurement assembly are arranged on the test board, so that the on-line measurement of material deformation and neutron fluence sensor screening and verification are realized, the on-line measurement of material deformation and neutron fluence is realized, the irradiation condition of the material in a reactor is reflected in real time, and the related irradiation parameters are accurately obtained, so that technical support is provided; the method solves the problem that the prior art can not visually acquire material deformation data and real-time neutron fluence.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a schematic structural diagram of a neutron fluence and deformation measuring device in a test reactor according to the invention.

Fig. 2 is a schematic structural view of a clamping assembly according to the present invention.

Figure 3 is a side view of a clamping assembly according to the present invention.

Fig. 4 is a sectional view a-a of fig. 3.

Fig. 5 is a sectional view B-B of fig. 3.

Fig. 6 is a schematic structural view of a transmission assembly according to the present invention.

Fig. 7 is a schematic structural view of a deformation measuring assembly according to the present invention.

Fig. 8 is a schematic view of the construction of a spring assembly according to the present invention.

Reference numerals: 1-clamping component, 2-transmission component, 3-deformation measuring component, 4-elastic component, 5-lower cover plate, 6-lower cushion block, 7-lower supporting block, 8-irradiation tank, 9-upper supporting block, 10-upper cover plate, 11-protecting tube, 12-transition tube, 13-positioning flange, 14-squirrel cage, 15-sealing plug, 16-air outlet tube, 17-quick joint, 18-test board, 101-clamping block, 102-elastic fixing piece, 103-neutron detector box, 104-filling block, 105-neutron detection rod, 106-detection rod clamping block, 201-clamping block, 202-transmission frame, 203-deformation transmission rod, 301-fixing block, 302-blocking piece, 303-threaded shaft, 304-displacement sensor, 401-baffle, 402-elastic support, 403-elastic member.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the invention.

It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

In the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Aiming at the on-line measurement requirements of researching micro-deformation and neutron fluence of materials in a reactor, the invention designs a device for measuring neutron fluence and deformation in a test reactor, which is used for screening and verifying sensors for measuring material deformation and neutron fluence on line, and provides technical support for realizing the on-line measurement of material deformation and neutron fluence, reflecting the irradiation condition of materials in the reactor in real time and accurately obtaining related irradiation parameters; the method solves the problem that the prior art can not visually acquire material deformation data and real-time neutron fluence.

A neutron fluence and deformation measuring device in a test reactor comprises: the testing device comprises an external shell, a clamping assembly 1, a neutron fluence measuring assembly and a deformation measuring assembly 3, wherein a test plate 18 is arranged in the clamping assembly 1, the clamping assembly 1 and the deformation measuring assembly 3 are both arranged in the external shell, and the neutron fluence measuring assembly is fixedly connected with the clamping assembly 1;

the clamping assembly 1 comprises a clamping block 101 and a fixing assembly, one end of the clamping block 101 is provided with a strip-shaped deep groove matched with the test plate 18, and the test plate 18 is fixed in the strip-shaped deep groove through the fixing assembly; the clamping block 101 may be a rectangular parallelepiped block or a cylindrical block, but since the clamping block 101 needs to be placed in an outer housing, it is preferable that both the clamping block 101 and the outer housing are configured in a circular shape so that they can be easily put in or taken out.

The test board 18 is fixed in the bar deep groove, so the size of the rectangular bar deep groove should match with the size of the test board 18, and in order to facilitate the loading and unloading of the test board 18, it is necessary to ensure that the specific size of the bar deep groove is not less than the size of the test board 18, and when the test board 18 is placed in the bar deep groove, it is necessary to ensure that the gap between the inner side surface of the bar deep groove and the outer side of the test board 18 is 0.5 mm-1 mm.

The deformation measuring component 3 comprises a fixing structure, a transmission component 2 and a displacement sensor 304, the displacement sensor 304 is fixedly connected with the fixing structure, and the measuring end of the displacement sensor 304 measures the deformation of the test board 18 through the transmission component 2.

The displacement sensor 304 in this embodiment is a LVDT sensor, which is a contact sensor, so that the measuring end of the LVDT needs to be directly or indirectly in contact with the test plate 18 to measure the deformation of the test plate 18.

In this embodiment, the deformation of the test plate 18 is transmitted through the transmission assembly 2, and then the transmission assembly 2 is contacted with the measuring end of the LVDT sensor to measure the deformation of the test plate 18.

For convenience of describing specific positions, the orientation in the present embodiment is described, taking the clamping block 101 as an example: setting one end of the deformation measuring component 3, which is opposite to the clamping block 101, as the upper end of the clamping block 101, and the other end of the clamping block 101 as the lower end of the clamping block 101; and by analogy, setting the upper end and the lower end of the neutron fluence and deformation measuring device in the whole test pile according to the upper end and the lower end of the clamping block 101.

The upper end and the lower end are only used for convenience of description, and in practical use, the specific use direction of the neutron fluence and deformation measuring device in the test reactor is not limited.

The strip-shaped deep groove is formed in the upper end of the clamping block 101, and the lower end face of the test plate 18 is attached to the lower end face of the strip-shaped deep groove;

and in order to facilitate the measurement of the test plate 18 by the deformation measuring component 3, the length of the measuring plate is generally set to be greater than the depth of the strip-shaped deep groove.

The fixing assembly comprises a plurality of elastic fixing pieces 102, the outer ends of the elastic fixing pieces 102 are fixedly connected with the clamping blocks 101, the inner ends of the elastic fixing pieces 102 abut against the side face of the test plate 18, and prestress towards the inner part of the test plate 18 is provided for the test plate 18.

In order to enable the test plate 18 to be stably installed in the strip-shaped deep groove, the test plate 18 is prestressed by the elastic fixing member 102, and is fixed.

Meanwhile, the elastic fixing member 102 has a certain elasticity, so that the elastic fixing member 102 can be compressed when the test board 18 expands, and the detection result is not affected.

The resilient mount 102 may be of a variety of configurations, one example of which is provided below:

a plurality of threaded through holes which are respectively vertical to the side surfaces of the strip-shaped deep grooves are formed in the clamping block 101;

the elastic fixing piece 102 comprises a threaded section and a spring section, the inner end of the threaded section of the elastic fixing piece 102 is fixedly connected with the outer end of the spring section of the elastic fixing piece 102, the threaded section of the elastic fixing piece 102 is in threaded connection with the threaded through hole, and the inner end of the spring section of the elastic fixing piece 102 abuts against the side face of the test board 18.

The integral adjustment of the elastic fixing member 102 is realized through the connection of the threaded section and the threaded through hole, so that the elastic fixing member 102 generates prestress on the test board 18 under the condition that the spring section is not compressed to the minimum length, thereby realizing the fixation of the test board 18.

When the test plate 18 expands, an acting force is applied to the spring section, and the spring section is compressed without influencing the deformation.

For ease of description of the location of the resilient mount 102, the sides of the test plate 18 will be named.

The other four sides of the test plate 18 are set in order: a first side, a second side, a third side, and a fourth side;

correspondingly, the other four side surfaces of the strip-shaped deep groove are set in sequence as follows: a first medial side, a second medial side, a third medial side, and a fourth medial side;

the first side face and the first inner side face are arranged oppositely, the second side face and the second inner side face are arranged oppositely, the third side face and the third inner side face are arranged oppositely, and the fourth side face and the fourth inner side face are arranged oppositely.

Example one

In this embodiment, the first inner side surface, the second inner side surface, the third inner side surface and the fourth inner side surface are all provided with the threaded through holes, and the elastic fixing member 102 applies prestress to the first side surface, the second side surface, the third side surface and the fourth side surface of the test board 18 to realize fixation.

Example two

In this embodiment, the third inner side surface and the fourth inner side surface are provided with threaded through holes;

when the test board 18 is fixed in the strip-shaped deep groove, the first side surface is attached to the first inner side surface, the second side surface is attached to the second inner side surface, the elastic fixing piece 102 arranged on the third inner side surface applies prestress to the test board 18 along the third side surface towards the first side surface, and the elastic fixing piece 102 arranged on the fourth inner side surface applies prestress to the test board 18 along the fourth side surface towards the second side surface.

The test board 18 is fixed by attaching the first side surface to the first inner side surface, attaching the second side surface to the second inner side surface, and applying prestress to the third side surface and the fourth side surface.

Fixed knot constructs including fixed block 301, threaded shaft 303 and separation blade 302, be provided with the hole of placing that is used for placing displacement sensor 304 on the fixed block 301, the lateral wall of placing the hole is provided with the screw hole with the outside intercommunication of fixed block 301, threaded shaft 303 and screw hole threaded connection, and the inner of threaded shaft 303 is connected with the lateral surface of separation blade 302, the medial surface of separation blade 302 supports with the lateral surface that sets up displacement sensor 304 placing downthehole and leans on, the lateral surface and the outside casing fixed connection of fixed block 301.

The displacement sensor 304 is placed in the placing hole, then the threaded shaft 303 is screwed in, so that the inner end of the threaded shaft 303 pushes the blocking piece 302 to be attached to the outer side face of the displacement sensor 304, and prestress is applied to the outer side face of the displacement sensor 304, and therefore fixing is achieved.

In order to facilitate the installation of the displacement sensor 304, an arc-shaped groove for placing the baffle plate 302 is arranged on the inner side surface of the placing hole, a counter bore is arranged on the outer side surface of the baffle plate 302, the inner end of the threaded shaft 303 abuts against the counter bore, and the baffle plate 302 moves inwards by screwing the threaded shaft 303.

The baffle 302 is an arc plate structure, and the inner side radian is matched with the outer edge radian of the LVDT sensor.

Drive assembly 2 includes grip block 201, the transfer line, driving frame 202 and deformation transfer bar 203, grip block 201 and test plate 18's upper end fixed connection, the lower extreme and grip block 201 fixed connection of transfer line, driving frame 202 and grip block 101's up end parallel arrangement and with the upper end fixed connection of transfer line, be provided with the bar hole on the driving frame 202, deformation transfer bar 203 passes the perpendicular setting of bar hole and test plate 18's up end, deformation transfer bar 203 is provided with outer nut, and deformation transfer bar 203 passes through nut and driving frame 202 fixed connection, displacement sensor 304's measuring end corresponds the setting with the upper end of deformation transfer bar 203, and measure the displacement volume of deformation transfer bar 203.

The deformation transmission rod 203 is fixed on the transmission frame 202 through a nut, the upper end of the deformation transmission rod 203 is directly connected to the movable end of the LVDT sensor, the transmission rod is fixedly connected with the clamping block 201, the clamping block 201 is connected to the upper end of the test plate 18, and therefore the deformation of the test plate 18 in the length direction can be directly transmitted to the LVDT sensor through the transmission assembly 2.

The lateral surface of deformation transfer bar 203 is provided with the external screw thread to all be provided with the nut at the last side and the downside of driving frame 202, adjust the position of two nuts on deformation transfer bar 203 and can adjust the position of deformation transfer bar 203 according to actual need.

Because the lower extreme of drive assembly 2 needs and test board 18 fixed connection, the upper end of drive assembly 2 needs and displacement sensor 304's measuring end laminating, consequently need guarantee that drive assembly 2 can the position relatively fixed, and can slide from top to bottom in the external casing again, consequently add the lower supporting piece 7 of a drum structure in this embodiment for carry out radial fixed to drive assembly 2's drive frame 202, make drive frame 202 can only slide from top to bottom at the medial surface of lower supporting piece 7, thereby realized the fixed to drive assembly 2.

The number of the placing holes, the displacement sensors 304 and the deformation transmission rods 203 is three, and the placing holes, the displacement sensors and the deformation transmission rods are distributed in a triangular shape.

The three displacement sensors 304 can be different models, the LVDT sensors of the three models monitor the same deformation, when the micro-deformation measurement is completed, the three LVDT sensors can be mutually contrasted, and the screening performance is more reliable.

And the connection stability can be increased by distributing the connection parts in a triangular manner.

Neutron fluence measurement subassembly includes neutron detector box 103, detection stick clamp 106 and neutron detection stick 105, and the up end of clamp 101 is provided with four at least detection holes, and detection stick clamp 106 parcel neutron detection stick 105 just inserts to the detection downthehole, and neutron detection stick 105 is used for the monitoring of real-time neutron fluence.

The axial direction of the clamping block 101 is provided with at least 4 detection holes, the tolerance between the hole diameter of the detection holes and the outer diameter of the detection rod clamping block 106 is less than 0.05mm, the detection rod clamping block 106 is composed of two semicircular pipes, and the neutron detection rod 105 is clamped in a circular cavity formed by the detection rod clamping block 106.

The side of clamp splice 101 is provided with the rectangular channel, and two neutron detector boxes 103 all set up in the rectangular channel, and are located the both ends of clamp splice 101 respectively, are provided with between two neutron detectors and fill up piece 104.

Neutron detection pieces are arranged in the neutron detector box 103, neutron fluence is obtained through analysis of the neutron detection pieces after the device is discharged, the obtained neutron fluence is compared with the obtained neutron fluence, and feasibility of the neutron detection rod 105 is verified.

A thermocouple is welded on the neutron detector box 103, the thermocouple leads the squirrel cage 14 through the protection tube 11 and then leads out of the reactor, and a sealing plug 15 and glue are adopted for sealing the squirrel cage 14.

The outer housing includes: the jar body, be used for fixed centre gripping subassembly 1 fill subassembly and supporting connecting piece.

Irradiation jar 8 and with can dismantle lower apron 5 and the upper cover plate 10 of being connected at the both ends of irradiation jar 8, centre gripping subassembly 1 and deformation measurement subassembly 3 are fixed in irradiation jar 8 through filling the subassembly, and centre gripping subassembly 1 sets up the upper end at deformation measurement subassembly 3.

The radiation tank comprises a positioning flange 13, a squirrel cage 14 is fixedly connected to a first end face of the positioning flange 13, an air outlet pipe 16 communicated with the inside of the squirrel cage 14 is arranged on the squirrel cage 14, a transition pipe 12 and a protection pipe 11 are sequentially arranged between a second end face of the positioning flange 13 and an upper cover plate 10, the squirrel cage 14, the transition pipe 12, the protection pipe 11 and the irradiation tank 8 are communicated with each other, and through holes for the air inlet pipe to pass through are formed in the upper cover plate 10, a transmission frame 202, a clamping block 101 and a fixing block 301.

The positioning flange 13 is used to connect it to the reactor.

The side of the fixed block 301 is provided with a gap for the lead of the LVDT sensor to pass through.

The terminal surface of upper cover plate 10, driving frame 202, clamp splice 101, fixed block 301 all is provided with the through-hole of 2 intake pipes, and the intake pipe passes this through-hole and deepens to irradiation jar 8 bottoms, and sets up quick-operation joint 17 in the intake pipe for with gas pitcher high-speed joint.

An annular cavity of 0.15-0.25 mm is formed between the outer side surface of the clamping block 101 and the inner side surface of the irradiation tank 8. During the test, two kinds of inert gases with large difference of heat conductivity coefficients are filled in the air inlet pipe; during testing, the annular cavity is filled with the mixed inert gas, and temperature control is realized by controlling the volume fraction of the two gases.

The outlet pipe 16 is used for discharging inert gas after the test and leading out a lead of the displacement sensor 304, a sealing plug 15 is arranged at the lead leading-out hole for sealing, and an outlet pipe nozzle which can be closed and opened is arranged on the outlet pipe 16.

The filling assembly comprises a lower cushion block 6, an upper supporting block 9, an elastic assembly 4 and an upper cushion block, wherein the lower cushion block 6 is arranged between the lower end face of the clamping assembly 1 and the lower cover plate 5, and the upper cushion block, the elastic assembly 4 and the upper supporting block 9 are sequentially arranged between the upper cover plate 10 and the upper end face of the deformation measuring assembly 3;

the components including the clamping assembly 1 and the deformation measuring assembly 3 are heated to expand, large deformation exists in the axial direction, the elastic assembly 4 can offset the deformation, and the safety of the device is guaranteed.

The elastic assembly 4 comprises a baffle 401, an elastic support 402 and an elastic piece 403, two ends of the elastic support 402 are respectively fixedly connected with the baffle 401 and the elastic piece 403, the baffle 401 and the elastic piece 403 are arranged in parallel with the lower cover plate 5, and the elastic support 402 can be a spring or an elastic sheet.

In this embodiment, spring 402 chooses for use the spring, sets up a plurality of round holes on baffle 401, sets up vertically guide post in a side of elastic component 403 to penetrate the round hole with the one end of guide post, make the guide post slide from top to bottom along the round hole, then with spring suit on the guide post, realize offsetting the purpose of deformation through compression spring.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of description and are not intended to limit the scope of the invention. It will be apparent to those skilled in the art that other variations or modifications may be made on the above invention and still be within the scope of the invention.