Closed test box for decontamination of supercritical carbon dioxide flow-carried dry ice particles

Abstract

The utility model relates to the technical field of nuclear facility decommissioning, in particular to a closed test box for decontaminating supercritical carbon dioxide flow-carried dry ice particles, which comprises a supporting seat, a box body is fixedly connected to the upper end of the supporting seat, and a first pipeline and a second pipeline are fixedly connected in the box body. Two baffles are connected into the supporting seat through a driving mechanism, a guide rail and a bearing seat are fixedly connected into the supporting seat, a rack is slidably connected into the guide rail, a rotating shaft is rotationally connected into the bearing seat, the baffles are fixedly installed at the front end of the rotating shaft, a gear is fixedly connected to the rear end of the rotating shaft, and the gear is meshed with the rack. The interior of the supporting seat is fixedly connected with an electric telescopic rod through a fixing seat, the output end of the electric telescopic rod is fixedly connected with a connecting block, and the connecting block is fixedly connected with the rack. Under the action of the baffle and the driving mechanism, the experiment table frame can be conveniently installed in the box body and can also be conveniently taken out of the box body.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear facility decommissioning, in particular to a closed test chamber for decontaminating supercritical carbon dioxide flowing with dry ice particles. Background Art

[0002] During the process of nuclear facility decommissioning on-site, a large amount of radioactive metal waste will be generated. Most of these wastes are surface contaminated and belong to low-level radioactive waste. By selecting a suitable decontamination method, these low-level radioactive metal wastes can be downgraded, greatly reducing the waste disposal cost. Supercritical carbon dioxide flowing with dry ice particles can be used to remove contaminants on the surface of nuclear equipment.

[0003] A closed test chamber for decontaminating supercritical carbon dioxide flowing with dry ice particles, with the Chinese utility model patent application number 201920739326.4, provides a closed test chamber for completing decontamination tests, avoiding a large amount of carbon dioxide gas from escaping into the laboratory, protecting the safety of staff, the public and the environment, and being flexible in operation.

[0004] However, in the above patent, the experimental bench for placing experimental samples is fixedly installed in the box body by using multiple fixing screws. When it is necessary to take out the experimental bench from the box body or install the experimental bench in the box body, the screws need to be disassembled or installed one by one, which is very troublesome and time-consuming. In order to more conveniently install the experimental bench in the box body or detach it from the box body, a closed test chamber for decontaminating supercritical carbon dioxide flowing with dry ice particles needs to be designed. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the defects existing in the prior art, and to propose a closed test chamber for decontaminating supercritical carbon dioxide flowing with dry ice particles.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: A closed test chamber for decontaminating supercritical carbon dioxide flowing with dry ice particles, including a support base, the upper end of the support base is fixedly connected with a box body, the inside of the box body is fixedly connected with a first pipeline and a second pipeline, the lower ends of the first pipeline and the second pipeline are jointly connected with a three-way pipe, the lower end of the three-way pipe is fixedly connected with a connecting hose, the inside of the box body is connected with a connecting seat through a position adjusting mechanism, the bottom end of the connecting seat is fixedly connected with a spray head, the end of the connecting hose away from the three-way pipe is fixedly connected with the spray head and is communicated with each other, an opening is formed on the front end surface of the box body, the bottom end inside the box body is slidably connected with an experimental bench, the experimental bench extends to the outside of the box body through the opening, the inside of the support base is connected with two baffle plates through a driving mechanism, both baffle plates block the front end of the experimental bench, and the driving mechanism is used for adjusting the angle of the baffle plates;

[0007] The driving mechanism includes a guide rail, a second electric telescopic rod, a rack, a gear, a rotating shaft, a bearing seat and a connecting block. A guide rail and a bearing seat are fixedly connected inside the support seat. A rack is slidably connected inside the guide rail. A rotating shaft is rotatably connected inside the bearing seat. The baffle is fixedly installed at the front end of the rotating shaft. A gear is fixedly connected to the rear end of the rotating shaft. The gear meshes with the rack. An electric telescopic rod is fixedly connected inside the support seat through a fixing seat. The output end of the electric telescopic rod is fixedly connected with a connecting block, and the connecting block is fixedly connected with the rack.

[0008] Further, an observation window is provided on the front end face of the box body.

[0009] Further, a sealing groove is formed on the front end face of the box body. A sealing ring is fixedly connected inside the sealing groove, and the experimental bench is in close fit with the sealing ring.

[0010] Further, a third pipeline is fixedly connected inside the box body, and the third pipeline communicates with the box body.

[0011] Further, a first electric telescopic rod is fixedly connected to the inner wall of the box body. The output end of the first electric telescopic rod is fixedly connected with a pressing plate, and the pressing plate is located directly to the left of the experimental bench.

[0012] Further, the position adjusting mechanism includes a fixing plate, a first motor, a first threaded rod, a guide rod, a moving frame, a second threaded rod, a second motor, a moving seat and a third motor. A fixing plate is fixedly connected to the top end inside the box body. A first threaded rod is rotatably connected between the fixing plate and the box body. A guide rod is fixedly connected between the fixing plate and the box body. A first motor is fixedly connected to the right end of the fixing plate. The output shaft end of the first motor is fixedly connected with the first threaded rod. A moving frame is threadedly connected to the circumferential surface of the first threaded rod. The guide rod passes through the moving frame, and the moving frame is slidably connected to the guide rod. A second motor is fixedly connected to the front end of the moving frame. A second threaded rod is rotatably connected inside the moving frame. The output shaft end of the second motor is fixedly connected with the second threaded rod. A moving seat is threadedly connected to the circumferential surface of the second threaded rod. The moving seat is located inside the moving frame and is slidably connected to the moving frame. A third motor is fixedly connected inside the moving seat. The output shaft end of the third motor is fixedly connected with the connecting seat.

[0013] The utility model has the following beneficial effects:

[0014] 1. Compared with the prior art, the closed test box for supercritical carbon dioxide flow-carrying dry ice particle decontamination not only facilitates the installation of the experimental bench in the box, but also facilitates the removal of the experimental bench from the box under the action of the baffle and the driving mechanism. Specifically, the two baffles can be driven to rotate by controlling the driving mechanism. When the baffle rotates to the front end of the experimental bench, the baffle can block the experimental bench so that it is firmly located in the box. When the baffle rotates to a state completely offset from the experimental bench, it is convenient to withdraw the experimental bench from the box, and then the experimental sample on the experimental bench can be taken out. In this way, whether it is installing or removing the experimental bench, it is more convenient and saves time and effort compared with the existing equipment.

[0015] 2. Compared with the prior art, the closed test box for supercritical carbon dioxide flow-carrying dry ice particle decontamination can squeeze and fix the experimental samples on the experimental bench through the cooperation of the first electric telescopic rod and the extrusion plate, so that the experimental samples are more stably located in the experimental bench, thereby facilitating the subsequent stable decontamination experiment on the experimental samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a closed test box for decontamination of dry ice particles carried by supercritical carbon dioxide flow proposed by the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of a closed test box for decontamination of dry ice particles carried by supercritical carbon dioxide flow, as shown in a partial cross-section viewed from above;

[0018] Figure 3 The utility model proposes a closed test box for decontamination of dry ice particles carried by supercritical carbon dioxide flow Figure 2 A is a schematic diagram of the enlarged structure of the middle part;

[0019] Figure 4 This is a structural schematic diagram of a closed test box for decontamination of dry ice particles carried by supercritical carbon dioxide flow proposed by the utility model, with the main view and partial section behind;

[0020] Figure 5 This is a structural schematic diagram of a closed test box for decontamination of dry ice particles carried by supercritical carbon dioxide flow, as shown in a left view after partial section;

[0021] Figure 6 The utility model proposes a closed test box for decontamination of dry ice particles carried by supercritical carbon dioxide flow Figure 5 A schematic diagram of the enlarged structure of B;

[0022] Figure 7Structural schematic diagram of a position adjustment mechanism in a closed test chamber for supercritical carbon dioxide flow - carrying dry - ice particle decontamination proposed by the present utility model.

[0023] Legend description:

[0024] 1. Support base; 2. Box body; 3. First pipeline; 4. Second pipeline; 5. Third pipeline; 6. Observation window; 7. Baffle; 8. Experimental bench; 9. First electric telescopic rod; 10. Extrusion plate; 11. Fixed plate; 12. First threaded rod; 13. Guide rod; 14. Second motor; 15. Three - way pipe; 16. Connecting hose; 17. First motor; 18. Second threaded rod; 19. Moving frame; 20. Moving seat; 21. Third motor; 22. Nozzle; 23. Connecting seat; 24. Bearing seat; 25. Rotating shaft; 26. Gear; 27. Second electric telescopic rod; 28. Guide rail; 29. Sealing ring; 30. Opening; 31. Rack; 32. Connecting block. Specific implementation mode

[0025] Refer to Figure 1-7 , a closed test chamber for supercritical carbon dioxide flow - carrying dry - ice particle decontamination provided by the present utility model includes a support base 1. The upper end of the support base 1 is fixedly connected with a box body 2. Inside the box body 2, a first pipeline 3 and a second pipeline 4 are fixedly connected. The lower ends of the first pipeline 3 and the second pipeline 4 are jointly connected with a three - way pipe 15. The lower end of the three - way pipe 15 is fixedly connected with a connecting hose 16. Inside the box body 2, a connecting seat 23 is connected through a position adjustment mechanism. The bottom end of the connecting seat 23 is fixedly connected with a nozzle 22. One end of the connecting hose 16 far from the three - way pipe 15 is fixedly connected with the nozzle 22 and is in mutual communication. An opening 30 is formed on the front end face of the box body 2. The bottom end inside the box body 2 is slidably connected with an experimental bench 8. The experimental bench 8 extends to the outside of the box body 2 through the opening 30. Inside the support base 1, two baffles 7 are connected through a driving mechanism. Both baffles 7 block the front of the experimental bench 8, and the driving mechanism is used to adjust the angle of the baffle 7;

[0026] The driving mechanism includes a guide rail 28, a second electric telescopic rod 27, a rack 31, a gear 26, a rotating shaft 25, a bearing seat 24 and a connecting block 32. Inside the support base 1, the guide rail 28 and the bearing seat 24 are fixedly connected. Inside the guide rail 28, the rack 31 is slidably connected. Inside the bearing seat 24, the rotating shaft 25 is rotatably connected. The baffle 7 is fixedly installed at the front end of the rotating shaft 25. The rear end of the rotating shaft 25 is fixedly connected to the gear 26. The gear 26 meshes with the rack 31. Inside the support base 1, an electric telescopic rod is fixedly connected through a fixed seat. The output end of the electric telescopic rod is fixedly connected to the connecting block 32, and the connecting block 32 is fixedly connected to the rack 31. During operation, the first pipe 3 is externally connected to a supercritical carbon dioxide input pipe, and the second pipe 4 is externally connected to a dry ice particle input pipe. At this time, both the supercritical carbon dioxide and the dry ice particles can simultaneously enter the connecting hose 16 through the three-way pipe 15 and are finally ejected through the nozzle 22. The gas and dry ice particles ejected from the nozzle 22 can perform a decontamination experiment on the experimental sample. When the experiment is completed, control the second electric telescopic rod 27 to contract. With the cooperation of the connecting block 32, drive the rack 31 to move outwards, thereby driving the gear 26 to rotate. The gear 26 drives the rotating shaft 25 to rotate, and the rotating shaft 25 drives the baffle 7 to rotate until the baffle 7 is completely staggered from the experimental bench 8, which facilitates the subsequent removal of the experimental bench 8 from the box body 2, thereby facilitating the removal of the experimental sample so that the operator can observe the decontamination situation of the experimental sample.

[0027] Furthermore, an observation window 6 is provided on the front end face of the box body 2. During operation, it is convenient to observe the experimental situation inside the box body 2 through the observation window 6.

[0028] Furthermore, a sealing groove is formed on the front end face of the box body 2. Inside the sealing groove, a sealing ring 29 is fixedly connected, and the experimental bench 8 is in close fit with the sealing ring 29. During operation, with the mutual cooperation of the sealing groove and the sealing ring 29, the sealing effect between the experimental bench 8 and the box body 2 can be better. During the process of cleaning the experimental sample with supercritical carbon dioxide flow and dry ice particles, the gas is not easily leaked out along the connection between the experimental bench 8 and the box body 2.

[0029] Furthermore, a third pipe 5 is fixedly connected inside the box body 2, and the third pipe 5 communicates with the box body 2. During operation, the third pipe 5 is externally connected to a gas collection device. During the experiment, the excess supercritical carbon dioxide gas and other gases can enter the gas collection device through the third pipe 5, which is not only convenient for subsequent recycling but also avoids these gases leaking into the outside world and affecting the environment.

[0030] Further, a first electric telescopic rod 9 is fixedly connected to the inner wall of the box body 2. The output end of the first electric telescopic rod 9 is fixedly connected to a pressing plate 10, and the pressing plate 10 is located at the leftmost end of the experimental bench 8. During operation, when placing an experimental sample on the experimental bench 8, it is necessary to ensure that the experimental sample is in contact with the front end face and the right end face inside the experimental bench 8. Then, the experimental bench 8 is pushed into the box body 2, and then the first electric telescopic rod 9 is controlled to operate, which can drive the pressing plate 10 to move to the right to press the experimental sample, so that the experimental sample can be stably located in the experimental bench 8, facilitating subsequent stable decontamination experiments on the experimental sample.

[0031] Further, the position adjustment mechanism includes a fixing plate 11, a first motor 17, a first threaded rod 12, a guide rod 13, a moving frame 19, a second threaded rod 18, a second motor 14, a moving seat 20, and a third motor 21. The fixing plate 11 is fixedly connected to the inner top of the box body 2. The first threaded rod 12 is rotatably connected between the fixing plate 11 and the box body 2. The guide rod 13 is fixedly connected between the fixing plate 11 and the box body 2. The right end of the fixing plate 11 is fixedly connected to the first motor 17. The output shaft end of the first motor 17 is fixedly connected to the first threaded rod 12. The circumferential surface of the first threaded rod 12 is threadedly connected to the moving frame 19. The guide rod 13 passes through the moving frame 19, and the moving frame 19 is slidably connected to the guide rod 13. The front end of the moving frame 19 is fixedly connected to the second motor 14. The second threaded rod 18 is rotatably connected inside the moving frame 19. The output shaft end of the second motor 14 is fixedly connected to the second threaded rod 18. The circumferential surface of the second threaded rod 18 is threadedly connected to the moving seat 20. The moving seat 20 is located inside the moving frame 19 and is slidably connected to the moving frame 19. The inside of the moving seat 20 is fixedly connected to the third motor 21. The output shaft end of the third motor 21 is fixedly connected to the connecting seat 23. During operation, the first motor 17 operates to drive the first threaded rod 12 to rotate. At this time, the moving frame 19 drives the second motor 14, the second threaded rod 18, the moving seat 20, the connecting seat 23, and the spray head 22 to move left and right along the guide rod 13. And the second motor 14 operates to drive the second threaded rod 18 to rotate. At this time, the moving seat 20 can drive the third motor 21, the connecting seat 23, and the spray head 22 to move back and forth along the moving frame 19. And the third motor 21 operates to drive the connecting seat 23 to rotate, thereby driving the spray head 22 to rotate. By adjusting the position of the spray head 22 in different directions, it is convenient to use the spray head 22 to perform decontamination experiments on multiple different positions of the experimental sample.

[0032] Working principle:

[0033] During use, place the experimental sample on the experimental bench 8, and then place the experimental bench 8 into the box body 2. Next, control the driving mechanism to operate, driving the baffle 7 to rotate until the baffle 7 blocks the front end of the experimental bench 8. At this time, the experimental bench 8 can be stably located inside the box body 2. Then, control the first electric telescopic rod 9 to operate, driving the extrusion plate 10 to move rightward to extrude the experimental sample. At this time, with the mutual cooperation of the extrusion plate 10 and the experimental bench 8, it can be ensured that the experimental sample is stably located inside the experimental bench 8. Finally, control the position adjustment mechanism to operate, driving the nozzle 22 to move in multiple directions. At this time, the supercritical carbon dioxide and dry ice particles ejected from the nozzle 22 can perform decontamination experiments on multiple different positions of the experimental sample.

[0034] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A closed test chamber for decontamination with dry ice particles carried by supercritical carbon dioxide flow, comprising a support base (1), characterized in that: The upper end of the support seat (1) is fixedly connected to a box body (2), the interior of the box body (2) is fixedly connected to a first pipe (3) and a second pipe (4), the lower ends of the first pipe (3) and the second pipe (4) are commonly connected to a three-pronged pipe (15), the lower end of the three-pronged pipe (15) is fixedly connected to a connecting hose (16), the interior of the box body (2) is connected to a connecting seat (23) via a position adjustment mechanism, the bottom end of the connecting seat (23) is fixedly connected to a nozzle (22), and the connecting hose (1 6) one end away from the three-pronged pipe (15) is fixedly connected to the nozzle (22) and communicates with each other; the front end surface of the box body (2) is provided with an opening (30); the inner bottom end of the box body (2) is slidably connected to a test bench (8); the test bench (8) extends to the outer end of the box body (2) through the opening (30); the interior of the support seat (1) is connected to two baffles (7) through a driving mechanism; both baffles (7) are blocked at the front end of the test bench (8), and the driving mechanism is used to adjust the angle of the baffle (7); The driving mechanism comprises a guide rail (28), a second electric telescopic rod (27), a rack (31), a gear (26), a rotating shaft (25), a bearing seat (24) and a connecting block (32); the guide rail (28) and the bearing seat (24) are fixedly connected inside the support seat (1); the rack (31) is slidably connected inside the guide rail (28); the rotating shaft (25) is rotatably connected inside the bearing seat (24); the baffle (7) is fixedly mounted on the front end of the rotating shaft (25); the gear (26) is fixedly connected to the rear end of the rotating shaft (25); the gear (26) is meshed with the rack (31); the electric telescopic rod is fixedly connected inside the support seat (1) via a fixed seat; the output end of the electric telescopic rod is fixedly connected to the connecting block (32), and the connecting block (32) is fixedly connected to the rack (31).

2. A closed test chamber for decontamination with dry ice particles carried by supercritical carbon dioxide according to claim 1, characterized in that: The front end surface of the box body (2) is provided with an observation window (6).

3. A closed test chamber for decontamination with dry ice particles carried by supercritical carbon dioxide according to claim 1, characterized in that: A sealing groove is provided on the front end surface of the box body (2), a sealing ring (29) is fixedly connected inside the sealing groove, and the experimental bench (8) is tightly fitted with the sealing ring (29).

4. A closed test chamber for decontamination with dry ice particles carried by supercritical carbon dioxide according to claim 1, characterized in that: A third pipe (5) is fixedly connected to the interior of the box (2), and the third pipe (5) and the box (2) are in communication with each other.

5. A closed test chamber for decontamination with dry ice particles carried by supercritical carbon dioxide flow according to claim 1, characterized in that: A first electric telescopic rod (9) is fixedly connected to the inner wall of the box body (2); an extrusion plate (10) is fixedly connected to the output end of the first electric telescopic rod (9); and the extrusion plate (10) is located at the left end of the experimental bench (8).

6. A closed test chamber for decontamination with dry ice particles carried by supercritical carbon dioxide flow according to claim 1, characterized in that: The position adjustment mechanism comprises a fixed plate (11), a first motor (17), a first threaded rod (12), a guide rod (13), a movable frame (19), a second threaded rod (18), a second motor (14), a movable seat (20) and a third motor (21); the inner top end of the box body (2) is fixedly connected with the fixed plate (11); the first threaded rod (12) is rotatably connected between the fixed plate (11) and the box body (2); the guide rod (13) is fixedly connected between the fixed plate (11) and the box body (2); the right end of the fixed plate (11) is fixedly connected with the first motor (17); the output shaft end of the first motor (17) is fixedly connected with the first threaded rod (12); the circumferential surface of the first threaded rod (12) is threaded A movable frame (19) is connected, the guide rod (13) passes through the movable frame (19), and the movable frame (19) is slidably connected to the guide rod (13), the front end of the movable frame (19) is fixedly connected to a second motor (14), the interior of the movable frame (19) is rotatably connected to a second threaded rod (18), the output shaft end of the second motor (14) is fixedly connected to the second threaded rod (18), the circumferential surface of the second threaded rod (18) is threadedly connected to a movable seat (20), the movable seat (20) is located in the movable frame (19) and is slidably connected to the movable frame (19), the interior of the movable seat (20) is fixedly connected to a third motor (21), and the output shaft end of the third motor (21) is fixedly connected to a connecting seat (23).

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