Sediment cleaning mechanism and filtering device

Abstract

The invention discloses a sediment cleaning mechanism and a filtering device. The sediment cleaning mechanism comprises a moving vehicle, a submersible pump arranged on the moving vehicle and a rolling brush head arranged on the moving vehicle; the rolling brush head is used for changing sediments under the moving trolley from a sediment attachment state to a suspension state, and the submersible pump is used for sucking the sediments in the suspension state; a sealing plate is further arranged on the mobile vehicle and used for preventing sediments in a suspended state from diffusing outwards, a water inlet hole is further formed in the sealing plate and formed in the end of the arc-shaped face, the mobile vehicle is used for moving along the end face of the bottom end of the pool, meanwhile, the rolling brush head is adopted for rubbing the end face of the bottom end of the pool, and the sealing plate is used for preventing the sediments in the suspended state from diffusing outwards. Sediments attached to the bottom end of the pool are mixed with water flow, the sediments at the bottom end of the pool are cleaned through the combined action of the submersible pump and the filter, meanwhile, the clean state of the water flow in the pool is kept, and the cleaning efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of decontamination of spent fuel pools, and in particular to a sediment cleaning mechanism and a filtering device. Background Art

[0002] Pressurized water reactors have the advantages of being structurally compact, small in volume, high in power density, relatively deep in average burnup, not prone to spillage of radioactive fission products, having good power self-stabilization and self-regulation characteristics, and high safety and reliability, and have become the main reactor types for newly built nuclear power plants in China.

[0003] During the operation of a pressurized water reactor, a major overhaul is generally required every 12 - 18 months to replace some nuclear fuel. The nuclear fuel is generally stored in the spent fuel pool of a power plant, and boric acid solution is contained in the pool. The pool is arranged with an open top. After being stored for a long time, dust and sundries in the environment will migrate into the spent fuel pool and form sediments at the bottom of the pool. Although the spent fuel pool is equipped with a filtering system, due to the large area of the pool and poor circulation of the boric acid solution at the bottom of the pool, some sediments will accumulate at the bottom of the pool. In addition, since the spent fuel has a certain radioactivity, these sediments have the risk of activation. Therefore, it is necessary to clean the sediments at the bottom of these pools. However, there is currently no cleaning device and technology for the sediments at the bottom of spent fuel pools. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is: it is necessary to clean the sediments at the bottom of the spent fuel pool.

[0005] The above technical problem is solved by the following technical solutions: The present invention provides a sediment cleaning mechanism, which includes a mobile vehicle, a submersible pump arranged on the mobile vehicle, and a rolling brush head arranged on the mobile vehicle; the rolling brush head is used to change the sediments directly below the mobile vehicle from the sediment-attached state to the suspended state, and the submersible pump is used to suck the suspended sediments; a sealing plate is also arranged on the mobile vehicle, and the sealing plate is used to prevent the suspended sediments from diffusing to the outside.

[0006] In a preferred embodiment of the sediment cleaning mechanism of the present invention: the bottom end of the sealing plate is higher than the bottom end of the moving wheels at the bottom end of the mobile vehicle, and the sealing plate is made of an elastic flexible material.

[0007] In a preferred embodiment of the sediment cleaning mechanism of the present invention: a fixing strip is arranged between two adjacent sealing plates, a moving track is arranged on the fixing strip, both sides of the sealing plate are located in the moving track, and the sealing plate can move up and down along the fixing strip.

[0008] In a preferred embodiment of the sediment cleaning mechanism of the present invention: an arc convex surface is provided at the bottom end of the sealing plate, and the part of the arc convex surface from both ends close to the submersible pump to the part in contact with the sealing plate is an arc surface.

[0009] In a preferred embodiment of the sediment cleaning mechanism of the present invention: a water inlet hole is further provided on the sealing plate, and the water inlet hole is arranged at the end of the arc surface.

[0010] In a preferred embodiment of the sediment cleaning mechanism of the present invention: a rotating ring is arranged in the water inlet hole, and a turbulence fan is arranged in the rotating ring.

[0011] In a preferred embodiment of the sediment cleaning mechanism of the present invention: applied to the sediment cleaning mechanism, it further includes a filter connected to the submersible pump and a moving carrier carrying the filter. The filter is used to filter the sediment in the liquid and then discharge the filtered liquid into the pool; the moving carrier is used to carry the filter and move synchronously with the moving vehicle.

[0012] In a preferred embodiment of the sediment cleaning mechanism of the present invention: the submersible pump is connected to the filter through a connecting pipe, and the filter discharges the liquid into the pool through a drain pipe.

[0013] In a preferred embodiment of the sediment cleaning mechanism of the present invention: the connecting pipe can be telescopic.

[0014] In a preferred embodiment of the sediment cleaning mechanism of the present invention: a waterproof camera is arranged on the moving vehicle, and both the moving vehicle and the moving carrier are provided with a remote control system.

[0015] The beneficial effects of the present invention are as follows: The moving vehicle is used to move along the bottom end face of the pool, and at the same time, a rolling brush head is used to rub the bottom end face of the pool, so that the sediment attached to the bottom end of the pool is mixed with the water flow. Through the combined action of the submersible pump and the filter, while cleaning the sediment at the bottom of the pool, the water flow in the pool is kept clean, the cleaning efficiency is improved, the effective cleaning of the sediment at the bottom of the spent fuel pool is realized, and the problem that there is currently no cleaning device and technology for the sediment at the bottom of this type of pool is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention and do not limit the present invention. Among them:

[0017] Figure 1 Shows a schematic working state diagram of the sediment cleaning mechanism;

[0018] Figure 2 Shows a schematic diagram of the mobile vehicle of the sediment cleaning mechanism;

[0019] Figure 3 Shows a schematic diagram of the structure of the mobile vehicle of the first embodiment of the sediment cleaning mechanism;

[0020] Figure 4 Shows a schematic diagram of the structure of the mobile vehicle of the second embodiment of the sediment cleaning mechanism;

[0021] Figure 5 Shows a schematic diagram of the sealing plate structure of the second embodiment of the sediment cleaning mechanism Figure 1 ;

[0022] Figure 6 Shows a schematic diagram of the sealing plate structure of the second embodiment of the sediment cleaning mechanism Figure 2 ;

[0023] Figure 7 Shows a schematic diagram of the structure of the connecting bracket of the rolling brush head of the sediment cleaning mechanism.

[0024] In the figure: 1, mobile vehicle; 2, submersible pump; 3, rolling brush head; 4, sealing plate; 41, fixing strip; 42, arc convex surface; 43, arc surface; 44, water inlet hole; 45, turbulence fan; 5, filter; 6, connecting pipe; 7, drain pipe; X, crane. Detailed implementation manners

[0025] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with the specific implementation manners and the accompanying drawings.

[0026] The terms used in the present invention are those general terms that are currently widely used in the art in consideration of the functions of the present invention, but these terms may change according to the intentions of those of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the overall description of the present invention.

[0027] Referring to Figure 1 , this embodiment provides a sediment cleaning mechanism, including a mobile vehicle 1, a submersible pump 2 provided on the mobile vehicle 1, and a rolling brush head 3 provided on the mobile vehicle 1; the rolling brush head 3 is used to change the sediment directly below the mobile vehicle 1 from a sediment-attached state to a suspended state, and the submersible pump 2 is used to suck the suspended sediment; a sealing plate 4 is further provided on the mobile vehicle 1, and the sealing plate 4 is used to prevent the suspended sediment from diffusing to the outside.

[0028] It should be noted that, asFigure 7 As shown, the connecting bracket between the rolling brush head 3 and the mobile vehicle 1 can adapt to the height difference of the concave and convex planes.

[0029] Specifically, referring to Figure 2 and Figure 3 , the bottom end of the sealing plate 4 is higher than the bottom end of the moving wheels of the mobile vehicle 1. The sealing plate 4 is made of elastic flexible material. It should be noted that the bottom end of the sealing plate 4 being higher than the bottom end of the moving wheels of the mobile vehicle 1 allows the water flow outside the mobile vehicle 1 to enter the bottom end of the mobile vehicle 1 through the bottom end of the sealing plate 4.

[0030] It should be noted that the setting of the sealing plate 4 can prevent the sediment in the suspended state from spreading to the outside, further improving the cleaning effect. The bottom end of the sealing plate 4 is higher than the bottom end of the moving wheels of the mobile vehicle and is made of elastic flexible material, allowing the water flow outside the mobile vehicle 1 to enter the bottom end of the mobile vehicle through the bottom end of the sealing plate 4, ensuring the water flow circulation.

[0031] Among them, referring to Figure 1 , it further includes a filter 5 connected to the submersible pump 2 and a mobile carrier for carrying the filter 5. The filter 5 is used to filter the sediment in the liquid and then discharge the filtered liquid into the pool; the mobile carrier is used to carry the filter 5 and move synchronously with the mobile vehicle 1.

[0032] Furthermore, referring to Figure 1 , the submersible pump 2 is connected to the filter 5 through a connecting pipe 6. The filter 5 discharges the liquid into the pool through a drain pipe 7. The connecting pipe 6 can be telescopic.

[0033] Even further, a waterproof camera is provided on the mobile vehicle 1, and both the mobile vehicle 1 and the mobile carrier are provided with a remote control system.

[0034] Operation process: There is a crane X and a moving track for the movement of the crane X at the end of the spent fuel pool. Then, connect the crane X to the mobile vehicle 1, and use the crane X to place the mobile vehicle 1 into the spent fuel pool. At the same time, place the filter 5 at the side of the pool. When the mobile vehicle 1 enters the bottom end of the spent fuel pool, control the mobile vehicle 1 to move along the bottom end of the pool through the remote control system of the mobile vehicle 1, and control the mobile carrier to move along the side of the pool through the remote control system of the mobile carrier, so that the mobile vehicle 1 and the mobile carrier are on the same horizontal line. Such a setting can reduce the length of the connecting pipe 6. The reduction in the length of the connecting pipe 6 reduces the weight of the connecting pipe 6, can reduce the gravity borne by the end of the connecting pipe 6, and at the same time can reduce the gravity borne by the filter 5 and the mobile vehicle 1, reducing the working burden of the mobile carrier and the mobile vehicle 1.

[0035] When the mobile vehicle 1 moves along the bottom of the pool, the rolling brush head 3 at the bottom of the mobile vehicle 1 rolls and frictions against the bottom surface of the pool, separating the sediment adhering to the pool floor from the bottom surface of the pool by friction, so that the sediment floats in the water. At this time, the submersible pump 2 sucks the water containing sediment at the bottom of the mobile vehicle 1, and conveys the sucked water to the filter 5 through the connecting pipe 6. After the water containing sediment passes through the filter 5, the filtered water is discharged into the pool through the drain pipe 7. In this way, by observing the sediment situation at the bottom of the mobile vehicle 1 and the surrounding pool bottom through the camera installed on the mobile vehicle 1 and uploading it to the remote control system, the remote control system controls the movement of the mobile vehicle 1 according to the pictures taken by the camera;

[0036] It should be noted that when the rolling brush head 3 frictions against the sediment at the bottom of the pool and separates the sediment from the bottom of the pool and mixes it into the water, since the sealing plates 4 are arranged around the mobile vehicle 1 and the suction force of the submersible pump 2 sucks the water mixed with sediment upward, the water mixed with sediment at the bottom of the mobile vehicle 1 will not move outward of the sealing plates 4, thus improving the cleaning efficiency.

[0037] Refer to Figures 4 to 6 , as an alternative embodiment, a fixing strip 41 is arranged between two adjacent sealing plates 4, a moving track is arranged on the fixing strip 41, both sides of the sealing plate 4 are located in the moving track, and the sealing plate 4 can move up and down along the fixing strip 41.

[0038] Refer to Figure 6 , specifically, an arc convex surface 42 is arranged at the bottom of the sealing plate 4, and the part from the two ends of the arc convex surface 42 close to the submersible pump 2 to the part in contact with the sealing plate 4 is an arc surface 43. It should be noted that since the bottom surface of the pool is not smooth, the function of arranging the arc convex surface 42 at the bottom of the sealing plate 4 is to facilitate the sealing plate 4 to move through the uneven part of the bottom of the pool following the mobile vehicle 1. The function of arranging the arc surface 43 at the part from the two ends of the arc convex surface 42 close to the submersible pump 2 to the part in contact with the sealing plate 4 is to facilitate the water flow to enter the water inlet hole 44, and the arc surface 43 can play a scouring role when the water flow enters the water inlet hole 44, so that no sundries will deposit at the end of the arc surface 43. The principle can refer to the principle of water flow scouring the surface of cobblestones.

[0039] Refer to Figure 5 , further, a water inlet hole 44 is also arranged on the sealing plate 4, the water inlet hole 44 is arranged at the end of the arc surface 43, a rotating ring is arranged in the water inlet hole 44, and a turbulence fan 45 is arranged in the rotating ring.

[0040] It should be noted that, different from the previous embodiment, the sealing plate 4 can move up and down along the moving track on the fixed strip 41 on the moving vehicle 1, and a water inlet hole 44 and a turbulence fan 45 are provided at the bottom end of the sealing plate 4; when the moving vehicle 1 enters the bottom end of the pool, the bottom end of the sealing plate 4 contacts the end face of the pool under the action of gravity. Since the bottom end of the pool is uneven, when the moving vehicle 1 moves, the sealing plate 4 moves up and down along the fixed strip 41. The water flow outside the sealing plate 4 enters the bottom end of the moving vehicle 1 through the water inlet hole 44 of the sealing plate 4 under the suction force of the submersible pump 2. When the water flow passes through the water inlet hole 44, the turbulence fan 45 rotates under the impact force of the water flow, so as to play a role in making the water flow entering the bottom end of the moving vehicle 1 turbulent. The impact force of the turbulent water flow entering the bottom end of the moving vehicle 1 is much greater than that of the water flow slowly entering the bottom end of the moving vehicle 1. At this time, combined with the friction force of the rolling brush head 3, more sediments can be separated from the end of the pool faster. The sediments separated from the end of the pool will not easily fall back to the bottom end of the pool under the action of turbulence, that is, the turbulent swirl generated by the water flow passing through the turbulence fan 45 and entering the bottom end of the moving vehicle 1 can make the sediments mix more completely with the water flow at the bottom end of the moving vehicle 1. At this time, since the turbulence fan 45 is provided at the bottom end of the sealing plate 4 and under the suction force of the submersible pump 2, the water mixed with sediments at the bottom end of the moving vehicle 1 will not move to the outside of the sealing plate 4, thus improving the cleaning efficiency.

[0041] Other structures, working processes and functions are the same as those of the previous embodiment.

[0042] Finally, it should be pointed out that the methods and devices described in detail above are only embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A sediment cleaning mechanism, characterized in that: It comprises a mobile vehicle (1), a submersible pump (2) arranged on the mobile vehicle (1), and a roller brush head (3) arranged on the mobile vehicle (1); The roller brush head (3) is used to change the sediment directly below the mobile vehicle (1) from a sedimentation and attachment state to a suspension state, and the submersible pump (2) is used to suck the sediment in the suspension state; The mobile vehicle (1) is also provided with a sealing plate (4), and the sealing plate (4) is used to prevent sediment in a suspended state from diffusing to the outside.

2. The sediment cleaning mechanism according to claim 1, characterized in that: The bottom end of the sealing plate (4) is higher than the bottom end of the moving wheel at the bottom end of the moving vehicle (1), and the sealing plate (4) is made of elastic and flexible material.

3. The sediment cleaning mechanism according to claim 1, characterized in that: A fixing strip (41) is provided between two adjacent groups of sealing plates (4), a movable track is provided on the fixing strip (41), both sides of the sealing plates (4) are located in the movable track, and the sealing plates (4) can move up and down along the fixing strip (41).

4. The sediment cleaning mechanism according to claim 3, characterized in that: The bottom end of the sealing plate (4) is provided with an arc-shaped convex surface (42), and the portion of the arc-shaped convex surface (42) from the two ends of the submersible pump (2) to the contact portion with the sealing plate (4) is an arc-shaped surface (43).

5. The sediment cleaning mechanism according to claim 4, characterized in that: The sealing plate (4) is also provided with a water inlet hole (44), and the water inlet hole (44) is arranged at the end of the arc-shaped surface (43).

6. The sediment cleaning mechanism according to claim 5, characterized in that: A rotating ring is arranged inside the water inlet hole (44), and a turbulent fan (45) is arranged inside the rotating ring.

7. A filtering device, characterized in that: The sediment cleaning mechanism applied to any one of claims 1 to 6 further comprises a filter (5) connected to the submersible pump (2) and a mobile carrier carrying the filter (5), wherein the filter (5) is used to filter sediment in the liquid and then discharge the filtered liquid into a pool; The mobile carrier is used to carry the filter (5) and move synchronously with the mobile vehicle (1).

8. The filtering device according to claim 7, characterized in that: The submersible pump (2) is connected to the filter (5) via a connecting pipe (6), and the filter (5) discharges the liquid into the pool via a drain pipe (7).

9. The filtering device according to claim 8, characterized in that: The connecting pipe (6) is telescopic.

10. The filtering device according to claim 8, characterized in that: The mobile vehicle (1) is provided with a waterproof camera, and both the mobile vehicle (1) and the mobile carrier are provided with a remote control system.

Images