Retention buffer mechanism and nuclear power station containment filtering equipment

Abstract

The utility model belongs to the technical field of nuclear power station containment vessels, and particularly relates to a retention buffer mechanism and nuclear power station containment vessel filtering equipment. The retention buffering mechanism comprises a buffering fan assembly, a supporting shaft and a retention basket provided with an inner space, a water inlet hole communicated with the inner space is formed in the top of the retention basket, and a plurality of first filtering holes communicated with the inner space are formed in the outer wall of the retention basket; the supporting shaft is installed in the inner space, and the buffering fan assembly is rotationally installed on the supporting shaft. The buffering fan assembly is used for buffering water flow flowing into the inner space through the water inlet hole and then flowing out through the first filtering hole. In the embodiment, water flow falls onto the buffer fan assembly through the water inlet hole, the water flow impacts the buffer fan assembly and drives the buffer fan assembly to rotate around the supporting shaft, and the impact force and kinetic energy of the water flow are reduced in the rotating process of the buffer fan assembly, so that the water flow flowing out of the first filtering hole has small impact force.

Description

Technical Field

[0001] The utility model belongs to the technical field of nuclear power plant containments, and particularly relates to a retention buffer mechanism and a nuclear power plant containment filtering device. Background Technique

[0002] When a high-energy pipe break accident occurs inside the containment of a nuclear power plant, the impact of the break medium will damage surrounding thermal insulation materials, paint, etc., generating a large amount of debris that is transmitted to the in-vessel refueling water tank at the bottom of the containment. After the accident, safety systems such as the emergency core cooling system and the containment spray system are put into operation. The pumps of the safety systems need to draw water from the in-vessel refueling water tank at the bottom of the containment to provide water sources for the pressure vessel for emergency core cooling and for the containment spray header for cooling spray. To ensure that the water quality meets the operating requirements of the safety systems, a filter is provided upstream of the suction inlet of the pump intake pipe inside the in-vessel refueling water tank to filter various debris, preventing the debris from entering downstream and causing blockages in the fuel assemblies inside the pressure vessel, the nozzles on the containment spray header, or affecting the normal operation of other equipment such as downstream pumps, valves, and heat exchangers.

[0003] However, the existing in-vessel refueling water tank of the containment has the following disadvantages: The water flow directly falls into the retention basket from above, and the impact force of the return water is completely absorbed by the retention basket. The retention basket needs to bear a large impact load, which not only poses higher requirements for the material and support design of the retention basket, but also affects the operating stability of the in-vessel refueling water tank of the containment, increasing the safety risk of the in-vessel refueling water tank of the containment. Summary of the Utility Model

[0004] The utility model aims at the technical problem of the large water flow impact force borne by the retention basket in the prior art, and provides a retention buffer mechanism and a nuclear power plant containment filtering device.

[0005] In view of the above technical problems, an embodiment of the utility model provides a retention buffer mechanism, including a buffer fan assembly, a support shaft, and a retention basket with an internal space. The top of the retention basket is provided with a water inlet hole communicating with the internal space, and a plurality of first filter holes communicating with the internal space are provided on the outer wall of the retention basket.

[0006] The support shaft is installed in the internal space, and the buffer fan assembly is rotatably installed on the support shaft; the buffer fan assembly is used to buffer the water flow flowing into the internal space through the water inlet hole and then flow out through the first filter holes.

[0007] Optionally, the retention buffer mechanism further includes a plurality of filter disks, each filter disk is provided with a plurality of second filter holes, and the plurality of filter disks are installed at intervals along the axial direction of the support shaft in the internal space.

[0008] Optionally, the buffer fan assembly includes a first buffer fan provided with a first through hole and a second buffer fan provided with a second through hole; a third through hole is further provided on each of the filter disks.

[0009] One end of the support shaft is installed on the bottom wall of the internal space, and the other end of the support shaft sequentially passes through the second through hole, the third through hole, and the first through hole.

[0010] Optionally, the filter disk includes an outer frame body, an inner frame body, support arms, and a filter plate disposed between the outer frame body and the inner frame body, and the support arms are connected between the inner frame body and the outer frame body; the second filter holes are provided on the filter plate, and the third through holes are provided on the inner frame body.

[0011] Optionally, a plurality of drawer holes are spaced apart on the side wall of the retention basket, and a plurality of support plates are spaced apart on the inner wall of the internal space, and the support plates are arranged in one-to-one correspondence with the drawer holes.

[0012] The filter disk is installed in the internal space through the drawer holes, and the support plates are used to support the outer frame body.

[0013] Optionally, a handle is provided at one end of the outer frame body facing away from the filter plate.

[0014] Optionally, the retention buffer mechanism further includes a conical diversion support installed in the internal space, and a plurality of guiding holes are provided on the side surface of the conical diversion support, and the conical diversion support is used to guide the water flow flowing into the internal space from the water inlet hole to the buffer fan assembly.

[0015] Optionally, an annular support arm is provided on the inner wall of the internal space, one end of the conical diversion support is abutted against the annular support arm, and the other end of the conical diversion support extends toward the water inlet hole.

[0016] The cross-sectional area of the conical diversion support near one end of the annular support arm is larger than the cross-sectional area near one end of the water inlet hole.

[0017] Optionally, the retention basket includes an upper box body, a middle box body, and a lower box body, the water inlet hole is provided on the upper box body, and the first filter holes are provided on the lower box body.

[0018] The outer wall of the upper box body is provided with a first annular flange, the outer walls of the opposite ends of the middle box body are respectively provided with a second annular flange and a third annular flange, the outer wall of the lower box body is provided with a fourth annular flange, the upper box body is installed on the middle box body through the connected first annular flange and the second annular flange, and the lower box body is installed on the middle box body through the connected third annular flange and the fourth annular flange; the internal space is arranged between the upper box body, the middle box body and the lower box body.

[0019] Another embodiment of the present invention further provides a nuclear power plant containment filtration device, including a water tank, a water pump, a support plate and the above-mentioned retention buffer mechanism; the support plate is arranged above the water tank, the retention basket is installed in the water tank, and the first filter hole communicates with the water tank; the inlet of the water pump communicates with the water tank, and the outlet of the water pump communicates with the water inlet hole.

[0020] In the present invention, water flows through the water inlet hole and falls onto the buffer fan assembly. The water impacts the buffer fan assembly and drives the buffer fan assembly to rotate around the support shaft. During the rotation of the buffer fan assembly, the impact force and kinetic energy of the water flow will be reduced, so that the water flow flowing out of the first filter hole has a smaller impact force. In addition, the first filter holes on the retention basket have a filtering effect on the water flow, ensuring the cleanliness of the water flow flowing out of the retention basket. Description of the Drawings

[0021] The present invention will be further described below with reference to the drawings and embodiments.

[0022] Figure 1 is a schematic structural diagram of a retention buffer mechanism provided by an embodiment of the present invention;

[0023] Figure 2 is a cross-sectional view of a retention buffer mechanism provided by an embodiment of the present invention;

[0024] Figure 3 is a partial schematic structural diagram of a retention buffer mechanism provided by an embodiment of the present invention;

[0025] Figure 4 is a schematic structural diagram of a filter disc of a retention buffer mechanism provided by an embodiment of the present invention;

[0026] Figure 5 is a schematic structural diagram of a conical diversion bracket of a retention buffer mechanism provided by an embodiment of the present invention;

[0027] Figure 6 is a schematic structural diagram of a retention basket of a retention buffer mechanism provided by an embodiment of the present invention;

[0028] Figure 7 This is a schematic structural diagram of a containment filtration device provided by an embodiment of the present utility model for a nuclear power plant.

[0029] The reference numerals in the specification are as follows:

[0030] 1. Buffer fan assembly; 11. First buffer fan; 12. Second buffer fan; 2. Support shaft; 3. Retention basket; 31. Internal space; 32. Water inlet hole; 33. First filter hole; 34. Drawer hole; 35. Support plate; 36. Annular support arm; 37. Upper box body; 371. First annular flange; 38. Middle box body; 381. Second annular flange; 382. Third annular flange; 39. Lower box body; 391. Fourth annular flange; 4. Filter disc; 41. Second filter hole; 42. Outer frame body; 43. Inner frame body; 44. Support arm; 45. Filter plate; 46. Handle; 5. Conical diversion support; 51. Guide hole; 6. Water pool; 7. Support beam. Detailed implementation manners

[0031] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0032] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "middle", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model.

[0033] As Figures 1 to 3 shown, a retention and buffer mechanism provided by an embodiment of the present utility model includes a buffer fan assembly 1, a support shaft 2, and a retention basket 3 having an internal space 31. The top of the retention basket 3 is provided with a water inlet hole 32 communicating with the internal space 31, and the outer wall of the retention basket 3 is provided with a plurality of first filter holes 33 communicating with the internal space 31. It can be understood that the water inlet hole 32 is provided at the top of the retention basket 3, and the first filter holes 33 can be provided at the bottom of the retention basket 3 or at the lower part of the side wall of the retention basket 3.

[0034] The support shaft 2 is installed in the internal space 31, and the buffer fan assembly 1 is rotatably installed on the support shaft 2; the buffer fan assembly 1 is used to buffer the water flow flowing into the internal space 31 through the water inlet hole 32 and then flow out through the first filter hole 33. Understandably, the buffer fan assembly 1 can be rotatably installed on the support shaft 2 through bearings, and the buffer fan assembly 1 can include a plurality of buffer fans spacedly installed on the support shaft 2.

[0035] Specifically, the water flow falls onto the buffer fan assembly 1 through the water inlet hole 32, the water flow impacts the buffer fan assembly 1 and drives the buffer fan assembly 1 to rotate around the support shaft 2. During the rotation of the buffer fan assembly 1, the impact force and kinetic energy of the water flow will be reduced, so that the water flow flowing out through the first filter hole 33 has a smaller impact force. In addition, the first filter hole 33 on the retention basket 3 has a filtering effect on the water flow, ensuring the cleanliness of the water flow flowing out of the retention basket 3.

[0036] In one embodiment, as Figure 2 and Figure 3 shown, the retention buffer mechanism further includes a plurality of filter discs 4, each of the filter discs 4 is provided with a plurality of second filter holes 41, and the plurality of filter discs 4 are spacedly installed in the internal space 31 along the axial direction of the support shaft 2. Preferably, the inner diameter of the second filter hole 41 is larger than the inner diameter of the first filter hole 33. Understandably, the plurality of filter discs 4 are spacedly installed in the internal space 31 in the up and down direction, and the number of the filter discs 4 can be set according to actual needs. For example, the filter discs 4 are provided with 2, 3, 4, etc.

[0037] In this embodiment, the water flow in the internal space 31 is multi-layer filtered by the plurality of second filter holes 41 of the plurality of filter discs 4 and then flows out through the first filter hole 33, further improving the filtering effect of the retention buffer mechanism. In addition, the plurality of filter discs 4 also have a buffering effect on the water flow, further ensuring the buffering effect of the retention buffer mechanism.

[0038] In one embodiment, as Figure 2 and Figure 3 shown, the buffer fan assembly 1 includes a first buffer fan 11 provided with a first through hole and a second buffer fan 12 provided with a second through hole; each of the filter discs 4 is further provided with a third through hole; understandably, the first buffer fan 11 can be rotatably installed on the support shaft 2 through a first bearing installed in the first through hole, and the second buffer fan 12 can be rotatably installed on the support shaft 2 through a second bearing installed in the second through hole.

[0039] One end of the support shaft 2 is mounted on the bottom wall of the inner space 31, and the other end of the support shaft 2 sequentially passes through the second through hole, the third through hole, and the first through hole. It can be understood that the first buffer fan 11 is located above all the filter disks 4, and the second buffer fan 12 is located below all the filter disks 4, that is, all the filter disks 4 are arranged at intervals between the first buffer fan 11 and the second buffer fan 12.

[0040] Specifically, the water flow flowing into the inner space 31 through the water inlet hole 32 first falls on the first buffer fan 11. After the water flow drives the first buffer fan 11 to rotate and is buffered by the first buffer fan 11, it falls on the plurality of filter disks 4. After the filter disks 4 filter and buffer the water flow, it falls on the second buffer fan 12. After the second buffer fan 12 further buffers the water flow, it flows out through the first filter hole 33. In this embodiment, the retention and buffer mechanism has a good buffering and filtering effect on the water flow.

[0041] In one embodiment, as Figure 4 shown, the filter disk 4 includes an outer frame body 42, an inner frame body 43, a support arm 44, and a filter plate 45 arranged between the outer frame body 42 and the inner frame body 43. The support arm 44 is connected between the inner frame body 43 and the outer frame body 42; the second filter hole 41 is arranged on the filter plate 45, and the third through hole is arranged on the inner frame body 43. It can be understood that the inner frame body 43, the outer frame body 42, and the support arm 44 are integrally formed. One end of the support arm 44 is connected to the inner corner of the inner frame body 43, and the other end of the support arm 44 is connected to the outer corner of the inner frame body 43. In this embodiment, the inner frame body 43 and the outer frame body 42 can support the filter plate 45, extending the service life of the filter disk 4.

[0042] In one embodiment, as Figure 1 、 Figure 2 and Figure 6 shown, a plurality of drawer holes 34 are also arranged at intervals on the side wall of the retention basket 3, and a plurality of support plates 35 are also arranged at intervals on the inner wall of the inner space 31. The support plates 35 and the drawer holes 34 are arranged in one-to-one correspondence; it can be understood that the drawer holes 34 are arranged on the front side surface of the retention basket 3, and the support plates 35 are arranged on the left inner wall, the right inner wall, and the rear inner wall of the retention basket 3; the number of the drawer holes 34, the support plates 35, and the filter disks 4 is equal, and the three are arranged in one-to-one correspondence.

[0043] The filter disk 4 is installed in the internal space 31 through the drawer hole 34, and the support plate 35 is used to support the outer frame body 42. It can be understood that the filter disk 4 is inserted into the internal space 31 through the drawer hole 34, and the support plate 35 abuts against the bottom wall of the filter disk 4, so that the support plate 35 can play a role in supporting the filter disk 4. In this embodiment, the filter disk 4 is detachably installed on the retention basket 3 in the form of a drawer, and the disassembly and assembly operation between the filter disk 4 and the retention basket 3 is convenient, so as to facilitate the cleaning of the filter disk 4.

[0044] In one embodiment, as Figure 1 and Figure 4 shown, a handle 46 is provided at one end of the outer frame body 42 facing away from the filter plate 45. It can be understood that when the filter disk 4 is installed in the internal space 31, the handle 46 is located outside the internal space 31, and the staff can pull out the filter disk 4 from the drawer hole 34 through the handle 46. In this embodiment, the design of the handle 46 further improves the convenience of disassembly and assembly of the filter disk 4.

[0045] In one embodiment, as Figure 2 and Figure 5 shown, the retention buffer mechanism further includes a conical diversion bracket 5 installed in the internal space 31. A plurality of guide holes 51 are provided on the side surface of the conical diversion bracket 5, and the conical diversion bracket 5 is used to guide the water flow flowing into the internal space 31 through the water inlet hole 32 to the buffer fan assembly 1. It can be understood that the side surface of the conical diversion bracket 5 has an inclined surface, and the side surface of the conical diversion bracket 5 is covered with the guide holes 51.

[0046] Specifically, the water flow from the water inlet hole 32 first falls on the conical diversion bracket 5 and flows along the side surface of the conical diversion bracket 5. During the process of the water flow flowing along the side surface of the conical diversion bracket 5, it will fall on the buffer fan assembly 1 through the guide holes 51. Since the side surface of the conical diversion bracket 5 is covered with the diversion holes, the flow rate will be evenly distributed to the buffer fan assembly 1, avoiding the impact problem caused by the water flow concentrating on the buffer fan assembly 1 and extending the service life of the retention buffer mechanism.

[0047] In one embodiment, as Figure 2As shown, a support arm 44 (ring-shaped support arm 4436) is provided on the inner wall of the internal space 31. One end of the conical flow guide bracket 5 is connected to the support arm 44 (ring-shaped support arm 4436), and the other end of the conical flow guide bracket 5 extends towards the water inlet hole 32; the cross-sectional area of the conical flow guide bracket 5 near one end connected to the support arm 44 (ring-shaped support arm 4436) is larger than the cross-sectional area near one end connected to the water inlet hole 32. It can be understood that the support arm 44 (ring-shaped support arm 4436) can support the conical flow guide bracket 5 from the bottom. The frame size of the upper end of the conical flow guide bracket 5 is smaller than that of the lower end, so that the side surface of the conical flow guide bracket 5 is an inclined surface, and thus water flow can flow along the side surface of the conical flow guide bracket 5. In this embodiment, the structure of the conical flow guide bracket 5 is simple, and the disassembly and assembly operation between the conical flow guide bracket 5 and the retention basket 3 is convenient.

[0048] In one embodiment, as Figure 1 and Figure 6 shown, the retention basket 3 includes an upper box body 37, a middle box body 38 and a lower box body 39. The water inlet hole 32 is provided on the upper box body 37, and the first filter hole 33 is provided on the lower box body 39;

[0049] A first annular flange 371 is provided on the outer wall of the upper box body 37. Second annular flanges 381 and third annular flanges 382 are respectively provided on the outer walls of the opposite ends of the middle box body 38. A fourth annular flange 391 is provided on the outer wall of the lower box body 39. The upper box body 37 is installed on the middle box body 38 through the connected first annular flange 371 and the second annular flange 381. The lower box body 39 is installed on the middle box body 38 through the connected third annular flange 382 and the fourth annular flange 391. The internal space 31 is arranged between the upper box body 37, the middle box body 38 and the lower box body 39. It can be understood that a first fastening hole is provided on the first annular flange 371, a second fastening hole is provided on the second annular flange 381, and the first annular flange 371 is connected to the second annular flange 381 through a first fixing member (such as a screw or a bolt) inserted into the first fastening hole and the second fastening hole; a third fastening hole is provided on the third annular flange 382, a fourth fastening hole is provided on the fourth annular flange 391, and the third annular flange 382 is connected to the fourth annular flange 391 through a second fixing member (such as a screw or a bolt) inserted into the third fastening hole and the fourth fastening hole.

[0050] In this embodiment, the disassembly and assembly operation between the upper box body 37, the middle box body 38 and the lower box body 39 is simple.

[0051] In summary, the assembly steps of the retention buffer mechanism are as follows: First, disassemble the upper box body 37, the middle box body 38, and the lower box body 39. Then, install the filter disc 4 into the internal space 31 of the middle box body 38 through the drawer hole 34. After that, pass the support shaft 2 through the third through-hole of the filter disc 4, sleeved all the first buffer fans 11 and the second buffer fans 12 on the support shaft 2, and install the conical guide bracket on the annular support arm 4436 of the support arm 44 of the middle box body 38. Finally, install the upper box body 37 and the lower box body 39 at the opposite ends of the middle box body 38 respectively.

[0052] The steps for disassembling the buffer disc from the retention basket are as follows: First, remove the lower box body 39 and / or the loading and unloading from the middle box body 38. Then, pull out the support shaft 2. Finally, the filter disc 4 can be pulled out through the drawer hole 34.

[0053] As Figure 7 shown, another embodiment of the present invention also provides a containment filtration device for a nuclear power plant, including a water tank 6, a water pump (not shown in the figure), a support beam 7, and the above-mentioned retention buffer mechanism; the support beam 7 is arranged above the water tank 6, the retention basket 3 is installed in the water tank 6, and the first filtration holes 33 communicate with the water tank 6; the inlet of the water pump communicates with the water tank 6, and the outlet of the water pump communicates with the water inlet hole 32.

[0054] Specifically, when a break accident occurs in the containment of a nuclear power plant, water bodies such as spray water in the containment flow back into the water tank 6, and the water pump extracts the water flow in the water tank 6 through the water inlet hole 32 into the internal space 31. During the process of the water flow flowing in the internal space 31, the buffer fan assembly 1 has a buffering effect on the water flow, and multiple filter discs 4 have a buffering and filtering effect on the water flow. Finally, the water flow returns to the water tank 6 through the first filtration holes 33. The operation of this containment filtration device for a nuclear power plant is stable and has high safety.

[0055] The above are only embodiments of the retention buffer mechanism and the containment filtration device for a nuclear power plant of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A retention buffer mechanism, characterized in that: It comprises a buffer fan assembly, a support shaft and a retention basket with an internal space, wherein the top of the retention basket is provided with a water inlet hole connected to the internal space, and the outer wall of the retention basket is provided with a plurality of first filter holes connected to the internal space; The support shaft is installed in the internal space, and the buffer fan assembly is rotatably installed on the support shaft; the buffer fan assembly is used to buffer the water flow flowing into the internal space from the water inlet hole and then flow out through the first filter hole.

2. The retention buffer mechanism according to claim 1, characterized in that: The retention buffer mechanism further includes a plurality of filter discs, each of which is provided with a plurality of second filter holes, and the plurality of filter discs are installed in the inner space at intervals along the axial direction of the support shaft.

3. The retention buffer mechanism according to claim 2, characterized in that: The buffer fan assembly comprises a first buffer fan provided with a first through hole and a second buffer fan provided with a second through hole; each filter disc is also provided with a third through hole; One end of the support shaft is mounted on the bottom wall of the inner space, and the other end of the support shaft passes through the second through hole, the third through hole, and the first through hole in sequence.

4. The retention buffer mechanism according to claim 3, characterized in that: The filter disc includes an outer frame, an inner frame, a support arm and a filter plate arranged between the outer frame and the inner frame, the support arm is connected to the inner frame and the outer frame; the second filter hole is arranged on the filter plate, and the third through hole is arranged on the inner frame.

5. The retention buffer mechanism according to claim 4, characterized in that: The side wall of the retention basket is also provided with a plurality of drawer holes distributed at intervals, and the inner wall of the internal space is also provided with a plurality of support plates distributed at intervals, and the support plates are arranged in one-to-one correspondence with the drawer holes; The filter tray is installed in the inner space through the drawer hole, and the support plate is used to support the outer frame.

6. The retention buffer mechanism according to claim 4, characterized in that: A handle is provided at one end of the outer frame body away from the filter plate.

7. The retention buffer mechanism according to claim 1, characterized in that: The retention buffer mechanism also includes a conical flow guide bracket installed in the internal space, and a plurality of guide holes are provided on the side of the conical flow guide bracket. The conical flow guide bracket is used to guide the water flow flowing into the internal space from the water inlet hole to the buffer fan assembly.

8. The retention buffer mechanism according to claim 7, characterized in that: An annular support arm is provided on the inner wall of the internal space, one end of the conical flow guide bracket is low-connected to the annular support arm, and the other end of the conical flow guide bracket extends toward the water inlet hole; The cross-sectional area of ​​the conical flow guide bracket at one end close to the annular support arm is larger than the cross-sectional area of ​​the end close to the water inlet hole.

9. The retention buffer mechanism according to claim 1, characterized in that: The retention basket comprises an upper box body, a middle box body and a lower box body, the water inlet hole is arranged on the upper box body, and the first filter hole is arranged on the lower box body; A first annular flange is provided on the outer wall of the upper box body, a second annular flange and a third annular flange are respectively provided on the outer walls at the opposite ends of the middle box body, and a fourth annular flange is provided on the outer wall of the lower box body. The upper box body is installed on the middle box body through the first annular flange and the second annular flange connected to each other, and the lower box body is installed on the middle box body through the third annular flange and the fourth annular flange connected to each other; the internal space is arranged between the upper box body, the middle box body and the lower box body.

10. A nuclear power plant containment filtration device, characterized in that: It comprises a water pool, a water pump, a support beam and a retention buffer mechanism as described in any one of claims 1 to 8; the support beam is arranged above the water pool, the retention basket is installed in the water pool, and the first filter hole is connected to the water pool; the inlet of the water pump is connected to the water pool, and the outlet of the water pump is connected to the water inlet hole.

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