Under-pressure duct irradiation device with autonomous rotation function

Abstract

The invention relates to the technical field of research of pile material irradiation, in particular to an under-pressure pore channel irradiation device with an autonomous rotation function, which comprises a far-end terminal, and a driving section, a protection tube and a test section which are sequentially connected, and is characterized in that the driving section is arranged outside an opening of an under-pressure pore channel and comprises a transmission shaft, a power transmission assembly, a servo motor and a controller; the transmission shaft is connected with the protection pipe, the servo motor is installed in the side direction of the transmission shaft, the controller is electrically connected with the servo motor, the far-end terminal is in communication connection with the controller, the power transmission assembly comprises a transmission shaft gear and a motor gear meshed with the transmission shaft gear, and the transmission shaft gear is in coaxial key connection with the transmission shaft. The motor gear is in coaxial key connection with an output shaft of the servo motor; and an air outlet pipe and a plurality of air inlet pipes communicated with the test section are arranged in the transmission shaft and the protection pipe. A servo motor remote control mode is adopted, autonomous rotation of the irradiation device bearing the tested piece and the temperature control function of the tested piece can be achieved, and the accuracy and reliability of a test result are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of research reactor material irradiation, and in particular to a pressurized channel irradiation device with an autonomous rotation function. Background Art

[0002] In recent years, the domestic nuclear industry has developed rapidly. In the context of vigorously promoting the localization of reactors and their supporting components, the demand for various new nuclear materials and in-pile detectors has become more urgent. Before new materials and in-pile detectors are put into use, they need to be verified in the research reactor for their physics, chemistry and reliability. When the test piece enters the research reactor for irradiation testing, the irradiation device, as the carrier medium of the test piece, on the one hand satisfies the interface of the research reactor, and on the other hand, it can clamp the test piece according to a certain rule to meet the requirements of the in-pile irradiation test.

[0003] At present, the material irradiation device used in the research reactor is mainly fixed on the flange of the reactor top during irradiation test. At this time, due to the structural characteristics of the reactor itself, half of the test pieces in the irradiation device are facing the core, and the other half are facing away from the core. This installation form will lead to uneven neutron injection and temperature distribution of the test pieces.

[0004] In response to the above problems, during the irradiation test of multiple furnace sections, the operator will manually turn the direction of the irradiator during the interval of shutdown and cooling to achieve consistency in the cumulative neutron injection of the test piece. However, this solution has obvious shortcomings. If the irradiation time of the test piece is an odd number of furnace sections, the neutron injection of the test piece will inevitably be different, which will affect the accuracy of the irradiation test results and does not conform to the current concept of refined irradiation test control.

[0005] Therefore, in view of the shortcomings of the existing irradiation device, a new irradiation device needs to be designed to solve the problem of uneven neutron injection and temperature distribution of the test piece in the irradiation device. Summary of the invention

[0006] The purpose of the present invention is to provide a pressurized channel irradiation device with an autonomous rotation function to solve the problem of uneven radial neutron injection and temperature distribution of the irradiation device. A servo motor is used to drive and fill inert gas, and the test piece is remotely controlled to achieve autonomous rotation with the irradiation device and to achieve temperature control of the test piece, thereby ensuring that the test piece receives uniform neutron injection and uniform temperature distribution during the in-pile irradiation test process, thereby improving the accuracy and reliability of the test results.

[0007] The present invention is implemented by the following technical solutions: a pressurized channel irradiation device with an autonomous rotation function, comprising a remote terminal and a driving section, a protection tube and a test section connected in sequence, wherein the driving section is arranged outside the pressurized channel opening to keep the protection tube and the test section inside the pressurized channel, and the test section is configured to carry a test piece;

[0008] The driving section includes a positioning flange, a transmission shaft, a power transmission assembly, a motor flange, a servo motor and a controller, wherein the positioning flange is arranged outside the pressure-carrying hole opening, the transmission shaft is connected to the protection tube through a transition tube arranged therebetween, the servo motor is installed on the side of the transmission shaft through the motor flange, the controller is electrically connected to the servo motor, the remote terminal is communicatively connected to the controller, the power transmission assembly includes a transmission shaft gear and a motor gear meshing with the transmission shaft gear, the transmission shaft gear is coaxially keyed to the transmission shaft, and the motor gear is coaxially keyed to the output shaft of the servo motor;

[0009] An air outlet pipe and a plurality of air inlet pipes connected to the test section are arranged in the transmission shaft, the transition pipe and the protection pipe.

[0010] According to a preferred embodiment, the driving section also includes a sealing box, a sealing ring and a clamping nut, the sealing box and the clamping nut are both sleeved on the protective tube, the sealing ring is arranged between the sealing box and the protective tube, the front end of the sealing box is connected to the rear end of the positioning flange, and the outer ring of the clamping nut is threadedly matched with the inner ring of the rear end of the sealing box.

[0011] According to a preferred embodiment, the driving section further comprises a plurality of support columns connected between the positioning flange and the motor flange.

[0012] According to a preferred embodiment, the motor flange is provided with a first axial hole that is clearance-matched with the output shaft of the servo motor and a second axial hole that is clearance-matched with the transmission shaft. A thrust ball bearing is provided at the rear end of the motor flange. The thrust ball bearing is sleeved on the transmission shaft and the inner ring is interference-fitted with the transmission shaft. The second axial hole is interference-fitted with the outer ring of the thrust ball bearing.

[0013] According to a preferred embodiment, a protective box and a bearing cover are provided at the rear end of the motor flange, a third axial hole that is clearance-matched with the output shaft of the servo motor and a fourth axial hole that is clearance-matched with the transmission shaft are provided on the protective box, a countersunk hole is provided on the inner side of the fourth axial hole, the countersunk hole is interference-fitted with the outer ring of the thrust ball bearing, the thrust ball bearing is installed in the countersunk hole, the bearing cover is sleeved on the transmission shaft, and the front end of the bearing cover passes through the fourth axial hole and abuts against the rear end of the thrust ball bearing.

[0014] According to a preferred embodiment, a squirrel cage flange is connected to the rear end of the transmission shaft, and a first through hole for the air inlet pipe to pass through and a second through hole for the air outlet pipe to pass through are formed on the squirrel cage flange.

[0015] According to a preferred embodiment, the air inlet end of the air inlet pipe is connected with an air nozzle.

[0016] According to a preferred embodiment, a plurality of the air inlet pipes are provided, and the plurality of the air inlet pipes are arranged in a ring shape inside the protection pipe, the transition pipe and the transmission shaft, and the air outlet pipe is arranged in an axial position of the protection pipe, the transition pipe and the transmission shaft.

[0017] According to a preferred embodiment, the outlet end of the outlet pipe is connected to a cage, and the cage is provided with a wire hole and an air hole.

[0018] According to a preferred embodiment, the outlet end of the wire hole is connected to an outlet pipe, and the rear end of the outlet pipe is connected to a sealing head assembly.

[0019] The technical solution of a pressurized channel irradiation device with an autonomous rotation function provided by the present invention has at least the following advantages and beneficial effects: (1) The present invention can be used to carry out material irradiation tests in the channels of research reactors, and the autonomous rotation function of the irradiation device carrying the test piece can be realized by adopting a servo motor remote control method; (2) The irradiation device of the present invention adopts gear transmission to transmit power to the servo motor during rotation, so that the autonomous rotation function of the irradiation device has higher precision; (3) While realizing the rotation function, the irradiation device of the present invention can realize the function of adjusting the temperature of the test piece in the test section by filling inert gas; (4) The servo motor controls the forward and reverse rotation of the transmission shaft, and cooperates with the wiring and ventilation in the protection tube and the transition tube transmission shaft, so as to reduce the risk of cables being entangled inside the device during rotation; (5) When the irradiation device with an autonomous rotation function of the present invention is fixed on the opening of the pressurized channel, it can be used as the pressure boundary of the pressure vessel by means of dynamic sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of a pressurized channel irradiation device with an autonomous rotation function provided in Example 1 of the present invention;

[0021] Figure 2 A schematic diagram of the positioning flange structure provided in Example 1 of the present invention;

[0022] Figure 3 A schematic diagram of the transition tube structure provided in Example 1 of the present invention;

[0023] Figure 4 A schematic diagram of the motor flange structure provided in Example 1 of the present invention;

[0024] Figure 5 A schematic diagram of the structure of a protection box provided in Embodiment 1 of the present invention;

[0025] Figure 6 A schematic diagram of the bearing gland structure provided in Example 1 of the present invention;

[0026] Figure 7 A schematic diagram of the transmission shaft gear structure provided in Example 1 of the present invention;

[0027] Figure 8 A schematic diagram of the transmission shaft structure provided in Example 1 of the present invention;

[0028] Fig. 9 A schematic diagram of the structure of a compression nut provided in Example 1 of the present invention;

[0029] Fig.10 for Figure 1 A partial enlarged schematic diagram of the middle drive section;

[0030] Icons: 1-test section, 2-protection tube, 3-inlet pipe, 4-outlet pipe, 5-positioning flange, 6-sealing box, 7-tensioning nut, 8-transition pipe, 9-drive shaft, 10-support rod, 11-motor flange, 12-motor gear, 13-servo motor, 14-squirrel cage flange, 15-air nozzle, 16-squirrel cage, 17-sealing head assembly, 18-bearing cover, 19-thrust ball bearing, 20-drive shaft gear, 21-protection box, 22-sealing ring. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Example 1

[0033] Figure 1 A schematic diagram of the structure of a pressurized channel irradiation device with autonomous rotation function provided by an embodiment of the present invention. Figure 1 As shown, the pressurized channel irradiation device consists of three parts, namely a driving section, a protection tube 2 and a test section 1, and the driving section, the protection tube 2 and the test section 1 are connected in sequence.

[0034] In this embodiment, the driving section is arranged outside the pressurized channel opening to keep the protective tube 2 and the test section 1 inside the pressurized channel; the test section 1 is configured to carry a test piece, such as a test material or a detector; the protective tube 2 is used to lead out the cable of the detector on the test section 1, such as the cable of a thermocouple, and is also used to supply inert gas to the test section 1 by forming a gas transmission channel inside to adjust the gas and control the temperature of the test piece.

[0035] The driving section is the core component of the irradiation device to realize the autonomous rotation function. In this embodiment, the driving section includes a positioning flange 5, a transmission shaft 9, a power transmission assembly, a motor flange 11, a servo motor 13, a sealing box 6, a sealing ring 22, a locking nut 7, a protective box 21 and a bearing cover 18.

[0036] See also Figure 2 As shown, the positioning flange 5 is arranged outside the pressurized channel opening; specifically in this embodiment, the positioning flange 5 is fixed to the outside of the pressurized channel opening of the pressure vessel by screws, and can serve as the pressure boundary of the pressure vessel after sealing treatment.

[0037] The sealing box 6 and the clamping nut 7 are both sleeved on the protection tube 2. The front end of the sealing box 6 is welded to the rear end of the positioning flange 5. The sealing ring 22 is filled between the sealing box 6 and the protection tube 2. The outer ring of the clamping nut 7 is threadedly matched with the inner ring of the rear end of the sealing box 6, so that the sealing ring 22 is tightly attached to the outer wall surface of the protection tube 2 and the inner wall surface of the sealing box 6 to achieve sealing, so as to reduce the influence of radiation irradiation on the servo motor 13. The clamping nut 7 is shown in FIG. Fig. 9 shown.

[0038] See also Figure 8 As shown, the transmission shaft 9 is a stepped shaft with a central opening, which can be divided into two sections, and a shoulder is set between the first section and the second section. As a key component for the irradiation device to realize the rotation function, the wall thickness of the transmission shaft 9 is not less than 5mm, and the surface quenching treatment is adopted to ensure its rigidity and hardness; in this embodiment, the diameter of the protection tube 2 is larger than the diameter of the first section of the transmission shaft 9, the wall thickness of the protection tube 2 is not less than 4mm and the straightness is less than 2mm. Since the wall thickness and diameter of the transmission shaft 9 are different from those of the protection tube 2, the transmission shaft 9 and the protection tube 2 are connected through a transition tube 8 set between the two. The transition tube 8 is shown in FIG. Figure 3 As shown; the rear end of the transition pipe 8 is welded to the front end of the first section of the transmission shaft 9, the front end of the transition pipe 8 is welded and fixed to the rear end of the protection tube 2, and the front end of the protection tube 2 is welded and fixed to the rear end of the test section 1.

[0039] The motor flange 11 is sleeved on the transmission shaft 9, and a number of support columns are arranged between the positioning flange 5 and the motor flange 11. The front ends of the support columns are connected to the positioning flange 5, and the rear ends are connected to the motor flange 11. Specifically in this embodiment, the front ends of the support columns are welded to the positioning flange 5, and the rear ends of the support columns are connected to the motor flange 11 with screws, thereby realizing the connection and fixation of the positioning flange 5 and the motor flange 11.

[0040] Furthermore, the servo motor 13 is mounted on the side of the transmission shaft 9 through the motor flange 11, and is fixed on the motor flange 11 by screws. The power transmission assembly includes a transmission shaft gear 20 and a motor gear 12 meshing with the transmission shaft gear 20. The transmission shaft gear 20 is shown in FIG. Figure 7 As shown; the transmission shaft gear 20 is coaxially keyed to the transmission shaft 9, and the motor gear 12 is coaxially keyed to the output shaft of the servo motor 13 to ensure the reliability of its rotation. When conducting the irradiation test, the power transmission component transmits the power of the servo motor 13 arranged on the side of the transmission shaft 9 to the transmission shaft 9, driving the test section 1 to rotate, which can not only realize the autonomous rotation function of the irradiation device, but also ensure that the autonomous rotation function has a high degree of accuracy. In addition, the servo motor 13 can be remotely controlled, such as by configuring a controller, electrically connecting the controller to the servo motor 13, and the remote terminal communicates with the controller to realize the remote control of the servo motor 13, which will not be described in detail here. This embodiment also installs a motor protection cover on the outside of the servo motor 13 to prevent failure caused by collision during use; a lead shielding layer is provided on the outside of the motor protection cover to protect the servo motor 13 in a radiation environment.

[0041] See also Figure 4 As shown, the motor flange 11 is provided with a first axial hole that is clearance-matched with the output shaft of the servo motor 13 and a second axial hole that is clearance-matched with the transmission shaft 9; a thrust ball bearing 19 is provided at the rear end of the motor flange 11, the thrust ball bearing 19 is sleeved on the transmission shaft 9 and the inner ring of the thrust ball bearing 19 is interference-fitted with the transmission shaft 9, and the second axial hole is interference-fitted with the outer ring of the thrust ball bearing 19; the thrust ball bearing 19 can bear the weight of the test section 1, the protective tube 2, the transition tube 8 and the transmission shaft 9, and limit its axial position to prevent the transmission shaft 9 from moving up and down during rotation.

[0042] Furthermore, a protection box 21 and a bearing cover 18 are provided at the rear end of the motor flange 11, and the protection box 21 is connected to the rear end of the motor flange 11 by screw fixing; see Figure 5As shown, the protection box 21 is provided with a third shaft hole which is clearance-matched with the output shaft of the servo motor 13 and a fourth shaft hole which is clearance-matched with the transmission shaft 9. The spacing between the third shaft hole and the fourth shaft hole is distributed according to the center distance between the transmission shaft gear 20 and the motor gear 12; a countersunk hole is provided on the inner side of the fourth shaft hole, and the countersunk hole is interference-fitted with the outer ring of the thrust ball bearing 19. The thrust ball bearing 19 is installed in the countersunk hole, and the bearing pressure cover 18 is sleeved on the transmission shaft 9. The front end of the bearing pressure cover 18 passes through the fourth shaft hole and abuts against the rear end of the thrust ball bearing 19 to ensure its axial position. The bearing pressure cover 18 is shown in FIG. Figure 6 shown.

[0043] See also Fig.10 As shown, the transmission shaft 9, transition pipe 8 and protection tube 2 are provided with an outlet pipe 4 and several inlet pipes 3 connected to the test section 1. Under the protection of the protection tube 2, the inlet pipe 3 and the outlet pipe 4 can avoid vibration caused by water flow impact in the reactor; through several inlet pipes 3, inert gases of different components can be flushed into the test section 1 to adjust the gas and temperature of the test piece; in addition, the outlet pipe 4 can be used to lead out the cable of the detector in addition to exhausting the gas in the test section 1. In this embodiment, the servo motor 13 provides forward and reverse functions, and limits the rotation angle of the transmission shaft 9 to between 0° and 360°, thereby reducing the risk of the lead wire of the detector on the test section 1 being entangled inside the device during rotation.

[0044] Example 2

[0045] This embodiment is based on the technical solution provided in Example 1, and further describes the arrangement of the air inlet pipe 3 and the air outlet pipe 4:

[0046] The rear end of the transmission shaft 9 is connected to a squirrel cage flange 14, which is fixed to the rear end of the transmission shaft 9 by welding; the squirrel cage flange 14 is provided with a first through hole for the air intake pipe 3 to pass through and a second through hole for the air outlet pipe 4 to pass through, the air intake pipe 3 to pass through and the air outlet pipe 4 to pass through are fixed to the squirrel cage flange 14 by circumferential welding, and the air intake end of the air intake pipe 3 is connected to an air nozzle 15.

[0047] Furthermore, multiple air inlet pipes 3 are provided, and the multiple air inlet pipes 3 are arranged in a ring shape inside the protective tube 2, the transition tube 8 and the transmission shaft 9, and the air outlet pipe 4 is arranged in the axial position of the protective tube 2, the transition tube 8 and the transmission shaft 9; the air outlet end of the air outlet pipe 4 is connected to the squirrel cage 16, and the air outlet end of the air outlet pipe 4 is sealed with the front end of the squirrel cage 16 by circumferential welding; the squirrel cage 16 is provided with a wire passing hole and an air passing hole, and the wire outlet end of the wire passing hole is connected to an outlet pipe, and the rear end of the outlet pipe is connected to a sealing head assembly 17. After the detector cable passes through the outlet pipe, the outlet pipe is sealed by the sealing head assembly 17. When the servo motor 13 drives the transmission shaft 9 to rotate, the air inlet pipe 3 and the air outlet pipe 4 rotate accordingly.

[0048] 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 pressure channel irradiation device with autonomous rotation function, characterized in that: It comprises a remote terminal and a driving section, a protection tube (2) and a test section (1) connected in sequence, wherein the driving section is arranged outside the opening of the pressure channel to keep the protection tube (2) and the test section (1) inside the pressure channel, and the test section (1) is configured to carry a test piece; The driving section comprises a positioning flange (5), a transmission shaft (9), a power transmission assembly, a motor flange (11), a servo motor (13) and a controller, wherein the positioning flange (5) is arranged at the outer side of the pressure-carrying hole opening, the transmission shaft (9) is connected to the protection tube (2) via a transition tube (8) arranged therebetween, the servo motor (13) is installed on the side of the transmission shaft (9) via the motor flange (11), the controller is electrically connected to the servo motor (13), the remote terminal is communicatively connected to the controller, the power transmission assembly comprises a transmission shaft gear (20) and a motor gear (12) meshing with the transmission shaft gear (20), the transmission shaft gear (20) is coaxially keyed to the transmission shaft (9), and the motor gear (12) is coaxially keyed to the output shaft of the servo motor (13); An air outlet pipe (4) and a plurality of air inlet pipes (3) connected to the test section (1) are arranged inside the transmission shaft (9), the transition pipe (8) and the protection pipe (2).

2. The pressurized channel irradiation device with autonomous rotation function as claimed in claim 1, characterized in that: The driving section further comprises a sealing box (6), a sealing ring (22) and a clamping nut (7); the sealing box (6) and the clamping nut (7) are both sleeved on the protective tube (2); the sealing ring (22) is arranged between the sealing box (6) and the protective tube (2); the front end of the sealing box (6) is connected to the rear end of the positioning flange (5); the outer ring of the clamping nut (7) is threadedly matched with the inner ring of the rear end of the sealing box (6).

3. The pressurized channel irradiation device with autonomous rotation function as claimed in claim 1, characterized in that: The driving section also includes a plurality of support columns connected between the positioning flange (5) and the motor flange (11).

4. The pressurized channel irradiation device with autonomous rotation function as claimed in claim 1, characterized in that: The motor flange (11) is provided with a first axial hole which is clearance-matched with the output shaft of the servo motor (13) and a second axial hole which is clearance-matched with the transmission shaft (9). A thrust ball bearing (19) is provided at the rear end of the motor flange (11). The thrust ball bearing (19) is sleeved on the transmission shaft (9) and the inner ring is interference-fitted with the transmission shaft (9). The second axial hole is interference-fitted with the outer ring of the thrust ball bearing (19).

5. The pressurized channel irradiation device with autonomous rotation function as claimed in claim 4, characterized in that: The rear end of the motor flange (11) is provided with a protection box (21) and a bearing cover (18); the protection box (21) is provided with a third axial hole which is clearance-matched with the output shaft of the servo motor (13) and a fourth axial hole which is clearance-matched with the transmission shaft (9); a countersunk hole is provided on the inner side of the fourth axial hole; the countersunk hole is interference-fitted with the outer ring of the thrust ball bearing (19); the thrust ball bearing (19) is installed in the countersunk hole; the bearing cover (18) is sleeved on the transmission shaft (9); the front end of the bearing cover (18) passes through the fourth axial hole and abuts against the rear end of the thrust ball bearing (19).

6. The pressurized channel irradiation device with autonomous rotation function as claimed in claim 1, characterized in that: The rear end of the transmission shaft (9) is connected to a squirrel cage flange (14), and the squirrel cage flange (14) is provided with a first through hole for the air inlet pipe (3) to pass through and a second through hole for the air outlet pipe (4) to pass through.

7. The pressurized channel irradiation device with autonomous rotation function as claimed in claim 1, characterized in that: The air inlet end of the air inlet pipe (3) is connected to an air nozzle (15).

8. The pressurized channel irradiation device with autonomous rotation function as claimed in claim 1, characterized in that: A plurality of the air inlet pipes (3) are provided, and the plurality of the air inlet pipes (3) are arranged in a ring shape inside the protection pipe (2), the transition pipe (8) and the transmission shaft (9), and the air outlet pipe (4) is arranged in an axial position of the protection pipe (2), the transition pipe (8) and the transmission shaft (9).

9. The pressurized channel irradiation device with autonomous rotation function as claimed in claim 1, characterized in that: The air outlet end of the air outlet pipe (4) is connected to a cage (16), and the cage (16) is provided with a wire hole and an air hole.

10. The pressurized channel irradiation device with autonomous rotation function as claimed in claim 9, characterized in that: The outlet end of the wire hole is connected to an outlet pipe, and the rear end of the outlet pipe is connected to a sealing head assembly (17).

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