Radiation device with self-rotating function

Abstract

The present application relates to the technical fields of research reactor material irradiation, and specifically relates to a kind of with autonomous rotating function's pressure hole irradiation device, including remote terminal and sequentially connected driving section, protection tube and test section, driving section is set in the pressure hole mouth outside, including transmission shaft, power transmission component, servo motor and controller, transmission shaft is connected with protection tube, servo motor is installed in the side direction of transmission shaft, controller is electrically connected with servo motor, remote terminal is connected with controller, power transmission component includes transmission shaft gear and the motor gear meshed with transmission shaft gear, transmission shaft gear is coaxially keyed with transmission shaft, motor gear is coaxially keyed with servo motor output shaft;Transmission shaft and protection tube are provided with the gas outlet pipe and several gas inlet pipes communicated with test section.In the present application, the mode of remote control of servo motor is used, the irradiation device of the test piece can be realized autonomous rotation and test piece temperature control function, and the accuracy and reliability of test result are improved.

Description

Technical Field

[0001] This invention relates to the field of irradiation technology for research reactor materials, and more specifically, to a pressurized channel irradiation device with autonomous rotation function. Background Technology

[0002] In recent years, China's nuclear industry has developed rapidly. Against the backdrop of vigorously promoting the localization of reactors and their supporting components, the demand for various new nuclear materials and in-reactor detectors has become increasingly urgent. Before new materials and in-reactor detectors are put into use, their physical, chemical, and reliability verification is required on a research reactor. When test specimens enter a research reactor for irradiation tests, the irradiation device serves as the carrier medium for the test specimens. On the one hand, it meets the interface requirements of the research reactor; on the other hand, it clamps the test specimens according to certain rules to meet the requirements of in-reactor irradiation tests.

[0003] Currently, irradiation devices used in reactors for irradiation experiments are mainly fixed to the reactor top flange. Due to the reactor's structural characteristics, half of the test specimen inside the irradiation device faces the reactor core, while the other half faces away from it. This installation method leads to uneven neutron flux and temperature distribution in the test specimen.

[0004] To address the aforementioned issues, during irradiation tests across multiple furnace sections, operators manually rotate the irradiation device during the cool-down intervals to ensure consistency in the cumulative neutron flux of the test specimens. However, this solution has significant drawbacks. When the irradiation time for the test specimen is an odd number of furnace sections, the neutron flux will inevitably differ, affecting the accuracy of the irradiation test results and contradicting the current concept of refined irradiation test control.

[0005] Therefore, in order to address the shortcomings of existing irradiation devices, it is necessary to design new irradiation devices to solve the problem of uneven neutron flux and temperature distribution in the test specimens within the irradiation device. Summary of the Invention

[0006] The purpose of this invention is to provide a pressurized channel irradiation device with autonomous rotation function to solve the problem of uneven radial neutron flux and temperature distribution in irradiation devices. It uses a servo motor for driving and is filled with inert gas. The test specimen is remotely controlled to achieve autonomous rotation with the irradiation device and achieve temperature control of the test specimen, thereby ensuring that the test specimen receives a uniform neutron flux and has a uniform temperature distribution during the in-pile irradiation test, and improving the accuracy and reliability of the test results.

[0007] The present invention is achieved through the following technical solution: a pressurized channel irradiation device with autonomous rotation function, comprising a remote terminal and a drive section, a protective tube and a test section connected in sequence, wherein the drive section is disposed outside the pressurized channel opening to keep the protective tube and the test section inside the pressurized channel, and the test section is configured to carry the test specimen;

[0008] The drive section includes a positioning flange, a drive shaft, a power transmission assembly, a motor flange, a servo motor, and a controller. The positioning flange is located outside the pressurized channel opening. The drive shaft and the protective pipe are connected through a transition pipe between them. The servo motor is mounted on the side of the drive 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 drive shaft gear and a motor gear meshing with the drive shaft gear. The drive shaft gear is coaxially keyed to the drive shaft, and the motor gear is coaxially keyed to the output shaft of the servo motor.

[0009] The drive shaft, transition pipe, and protective pipe are equipped with an exhaust pipe and several intake pipes that are connected to the test section.

[0010] According to a preferred embodiment, the drive section further 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 disposed 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. The outer ring of the clamping nut is threadedly engaged with the inner ring of the rear end of the sealing box.

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

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

[0013] According to a preferred embodiment, the rear end of the motor flange is provided with a protective box and a bearing cover. The protective box has a third shaft hole that is clearance-fitted with the output shaft of the servo motor and a fourth shaft hole that is clearance-fitted with the transmission shaft. A countersunk hole is provided on the inner side of the fourth shaft 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. The front end of the bearing cover passes through the fourth shaft hole and abuts against the rear end of the thrust ball bearing.

[0014] According to a preferred embodiment, the rear end of the drive shaft is connected to a squirrel cage flange, and the squirrel cage flange has a first through hole for the intake pipe to pass through and a second through hole for the exhaust pipe to pass through.

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

[0016] According to a preferred embodiment, the air intake pipe is provided in multiple ways, and the multiple air intake pipes are arranged in a ring inside the protective pipe, the transition pipe and the drive shaft, and the air outlet pipe is arranged in the axial position of the protective pipe, the transition pipe and the drive shaft.

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

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

[0019] The technical solution of the pressurized duct irradiation device with autonomous rotation function provided by the present invention has at least the following advantages and beneficial effects: (1) The present invention can be used in the duct of a research reactor to conduct material irradiation tests. By using the remote control method of servo motor, the irradiation device carrying the test specimen can realize the autonomous rotation function; (2) During the rotation of the irradiation device of the present invention, the power transmission with the servo motor is carried out by gear transmission, which makes the autonomous rotation function of the irradiation device have high 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 specimen in the test section by filling in inert gas; (4) By controlling the forward and reverse rotation of the transmission shaft by servo motor, and cooperating with the wiring and ventilation in the transmission shaft of the protective tube and transition tube, the risk of the cable getting tangled inside the device during the rotation process can be reduced; (5) When the irradiation device with autonomous rotation function of the present invention is fixed on the pressurized duct opening, it can be used as the pressure boundary of the pressure vessel by means of dynamic sealing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the pressurized channel irradiation device with autonomous rotation function provided in Embodiment 1 of the present invention;

[0021] Figure 2 This is a schematic diagram of the positioning flange structure provided in Embodiment 1 of the present invention;

[0022] Figure 3 This is a schematic diagram of the transition tube structure provided in Embodiment 1 of the present invention;

[0023] Figure 4 This is a schematic diagram of the motor flange structure provided in Embodiment 1 of the present invention;

[0024] Figure 5 This is a schematic diagram of the protective box structure provided in Embodiment 1 of the present invention;

[0025] Figure 6 This is a schematic diagram of the bearing cap structure provided in Embodiment 1 of the present invention;

[0026] Figure 7 This is a schematic diagram of the transmission shaft gear structure provided in Embodiment 1 of the present invention;

[0027] Figure 8 This is a schematic diagram of the transmission shaft structure provided in Embodiment 1 of the present invention;

[0028] Figure 9 This is a schematic diagram of the clamping nut structure provided in Embodiment 1 of the present invention;

[0029] Figure 10 for Figure 1 Enlarged schematic diagram of a portion of the middle drive section;

[0030] Icons: 1-Test section, 2-Protective pipe, 3-Inlet pipe, 4-Outlet pipe, 5-Positioning flange, 6-Sealing box, 7-Pressure 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-Protective box, 22-Sealing ring. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Example 1

[0033] Figure 1 This is a schematic diagram of a pressurized channel irradiation device with autonomous rotation function, provided as an embodiment of the present invention. See also... Figure 1 As shown, the pressurized duct irradiation device consists of three parts: a drive section, a protective tube 2, and a test section 1, which are connected in sequence.

[0034] In this embodiment, the drive section is located 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 the test specimen, such as the material being tested or the detector; the protective tube 2 is used to lead out the detector cable on the test section 1, such as the thermocouple cable, and is also used to supply inert gas to the test section 1 by forming a gas supply channel inside to regulate the gas and temperature of the test specimen.

[0035] As the core component for the autonomous rotation function of the irradiation device, the drive section in this embodiment includes a positioning flange 5, a drive shaft 9, a power transmission component, a motor flange 11, a servo motor 13, a sealing box 6, a sealing ring 22, a clamping nut 7, a protective box 21, and a bearing cover 18.

[0036] See Figure 2 As shown, the positioning flange 5 is located outside the pressurized passage. Specifically, in this embodiment, the positioning flange 5 is fixed to the outside of the pressurized passage of the pressure vessel by screws, and after sealing treatment, it can serve as the pressure boundary of the pressure vessel.

[0037] Both the sealing box 6 and the clamping nut 7 are fitted onto the protective 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 protective tube 2. The outer ring of the clamping nut 7 is threadedly engaged with the inner ring at the rear end of the sealing box 6, so that the sealing ring 22 is tightly fitted against the outer wall of the protective tube 2 and the inner wall of the sealing box 6 to achieve a seal, thereby reducing the impact of radiation on the servo motor 13. (See attached image for details on the clamping nut 7.) Figure 9 As shown.

[0038] See Figure 8 As shown, the drive shaft 9 is a stepped shaft with a central opening, which can be divided into two sections, with a shoulder provided between the first and second sections. As a key component for the irradiation device to achieve its rotational function, the drive shaft 9 has a wall thickness of not less than 5mm and undergoes surface hardening treatment to ensure its rigidity and hardness. In this embodiment, the diameter of the protective tube 2 is larger than the diameter of the first section of the drive shaft 9, the wall thickness of the protective tube 2 is not less than 4mm, and its straightness is less than 2mm. Since the wall thickness and diameter of the drive shaft 9 differ from those of the protective tube 2, the drive shaft 9 and the protective tube 2 are connected by a transition tube 8 positioned between them. (See the image for the transition tube 8.) Figure 3 As shown; the rear end of the transition tube 8 is welded to the front end of the first section of the drive shaft 9, the front end of the transition tube 8 is welded and fixed to the rear end of the protective tube 2, and the front end of the protective tube 2 is welded and fixed to the rear end of the test section 1.

[0039] The motor flange 11 is sleeved on the drive shaft 9. Several support columns are provided between the positioning flange 5 and the motor flange 11. The front end of the support columns is connected to the positioning flange 5, and the rear end is connected to the motor flange 11. Specifically, in this embodiment, the front end of the support column is welded to the positioning flange 5, and the rear end of the support column is connected to the motor flange 11 with screws, thereby realizing the connection and fixation between the positioning flange 5 and the motor flange 11.

[0040] Furthermore, the servo motor 13 is mounted on the side of the drive shaft 9 via the motor flange 11, and is fixed to the motor flange 11 by screws. The power transmission assembly includes a drive shaft gear 20 and a motor gear 12 meshing with the drive shaft gear 20. See [reference needed] for details on the drive shaft gear 20. 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. During irradiation testing, the power transmission assembly transmits power from the servo motor 13, located on the side of the transmission shaft 9, to the transmission shaft 9, driving the test section 1 to rotate. This enables the irradiation device to rotate autonomously with high precision. Furthermore, the servo motor 13 can be remotely controlled, for example, by configuring a controller and electrically connecting it to the servo motor 13. The remote terminal communicates with the controller to remotely control the servo motor 13; details are omitted here. This embodiment also includes a motor protective sleeve installed on the outside of the servo motor 13 to prevent damage from impacts during use. This protective sleeve has a lead shielding layer to protect the servo motor 13 in the radiation environment.

[0041] See Figure 4 As shown, the motor flange 11 has a first shaft hole that is clearance-fitted with the output shaft of the servo motor 13 and a second shaft hole that is clearance-fitted with the transmission shaft 9; the rear end of the motor flange 11 is provided with a thrust ball bearing 19, which is sleeved on the transmission shaft 9 and has an inner ring that is interference-fitted with the transmission shaft 9, and the second shaft 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 protective box 21 and a bearing cover 18 are provided at the rear end of the motor flange 11. The protective box 21 is connected to the rear end of the motor flange 11 by screws. See also Figure 5As shown, the protective box 21 has a third shaft hole that is clearance-fitted with the output shaft of the servo motor 13 and a fourth shaft hole that is clearance-fitted with the transmission shaft 9. The distance between the third and fourth shaft holes is distributed according to the center distance between the transmission shaft gear 20 and the motor gear 12. A countersunk hole is formed on the inner side of the fourth shaft 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 cap 18 is sleeved on the transmission shaft 9. The front end of the bearing cap 18 passes through the fourth shaft hole and abuts against the rear end of the thrust ball bearing 19 to ensure its axial position. See [reference needed]. Figure 6 As shown.

[0043] See Figure 10 As shown, the drive shaft 9, transition pipe 8, and protective pipe 2 are equipped with an exhaust pipe 4 and several intake pipes 3 connected to the test section 1. The intake pipes 3 and exhaust pipes 4, protected by the protective pipe 2, prevent vibration caused by water flow impact within the reactor. Through the intake pipes 3, inert gases of different compositions can be injected into the test section 1 for gas regulation and temperature control of the test specimen. Furthermore, the exhaust pipes 4, in addition to discharging gas from the test section 1, can also be used to lead out the detector cables. In this embodiment, the servo motor 13 provides forward and reverse rotation functions, limiting the rotation angle of the drive shaft 9 to between 0° and 360°, thereby reducing the risk of the detector leads on the test section 1 becoming entangled inside the device during rotation.

[0044] Example 2

[0045] This embodiment, based on the technical solution provided in Embodiment 1, further explains the arrangement of the intake pipe 3 and the exhaust pipe 4:

[0046] The rear end of the drive shaft 9 is connected to a squirrel cage flange 14, which is fixed to the rear end of the drive shaft 9 by welding. The squirrel cage flange 14 has a first through hole for the intake pipe 3 to pass through and a second through hole for the exhaust pipe 4 to pass through. The intake pipe 3 and the exhaust pipe 4 are fixed to the squirrel cage flange 14 by circumferential welding. The intake end of the 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 inside the protective pipe 2, the transition pipe 8, and the drive shaft 9. The air outlet pipe 4 is arranged in the axial position of the protective pipe 2, the transition pipe 8, and the drive 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 to the front end of the squirrel cage 16 by circumferential welding. The squirrel cage 16 is provided with wire passage holes and air passage holes. The wire outlet end of the wire passage hole is connected to the wire outlet pipe, and the rear end of the wire outlet pipe is connected to the sealing head assembly 17. After the detector cable passes through the wire outlet pipe, the sealing head assembly 17 is used to seal the wire outlet pipe. When the servo motor 13 drives the drive shaft 9 to rotate, the air inlet pipe 3 and the air outlet pipe 4 rotate accordingly.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pressurized channel irradiation device with autonomous rotation function, characterized in that, It includes a remote terminal and a drive section, a protective tube (2) and a test section (1) connected in sequence, wherein the drive section is located outside the pressurized channel to keep the protective tube (2) and the test section (1) inside the pressurized channel, and the test section (1) is configured to carry the test specimen; The drive section includes a positioning flange (5), a drive shaft (9), a power transmission assembly, a motor flange (11), a servo motor (13), and a controller. The positioning flange (5) is located outside the pressurized channel opening. The drive shaft (9) is connected to the protective pipe (2) through a transition pipe (8) located between the two. The servo motor (13) is installed on the side of the drive shaft (9) through 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 includes a drive shaft gear (20) and a motor gear (12) meshing with the drive shaft gear (20). The drive shaft gear (20) is coaxially keyed to the drive shaft (9). The motor gear (12) is coaxially keyed to the output shaft of the servo motor (13). The drive shaft (9), transition pipe (8) and protective pipe (2) are equipped with an exhaust pipe (4) and several intake pipes (3) that are connected to the test section (1); The drive section also includes 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 set 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 engaged with the inner ring of the rear end of the sealing box (6). The drive section also includes several support columns connected between the positioning flange (5) and the motor flange (11).

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

3. The pressurized channel irradiation device with autonomous rotation function as described in claim 2, characterized in that, The rear end of the motor flange (11) is provided with a protective box (21) and a bearing cover (18). The protective box (21) is provided with a third shaft hole that is clearance-fitted with the output shaft of the servo motor (13) and a fourth shaft hole that is clearance-fitted with the transmission shaft (9). A countersunk hole is provided on the inner side of the fourth shaft 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 shaft hole and abuts against the rear end of the thrust ball bearing (19).

4. The pressurized channel irradiation device with autonomous rotation function as described in claim 1, characterized in that, The rear end of the drive shaft (9) is connected to a squirrel cage flange (14), which has 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.

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

6. The pressurized channel irradiation device with autonomous rotation function as described in claim 1, characterized in that, The air intake pipe (3) is provided in multiple ways. The multiple air intake pipes (3) are arranged in a ring inside the protective pipe (2), the transition pipe (8) and the drive shaft (9). The air outlet pipe (4) is arranged in the axial position of the protective pipe (2), the transition pipe (8) and the drive shaft (9).

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

8. The pressurized channel irradiation device with autonomous rotation function as described in claim 7, characterized in that, The outlet end of the wire hole is connected to an outlet tube, and the rear end of the outlet tube is connected to a sealing head assembly (17).

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