Pit filtering mechanism and pit filter
By using the coaxially arranged outer filter cylinder, middle filter cylinder and inner filter cylinder structure in the pit filter of the nuclear power plant, the problem of easy sealing of the filter is solved, and the efficiency and stability of the water supply of the nuclear power plant is achieved.
Patent Information
- Application Number
- CN202422387497.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-29
AI Technical Summary
In the prior art, the outer filter cartridge and inner filter cartridge of the pit filter of the nuclear power plant are easily blocked by impurities, which affects the water supply efficiency of the nuclear power plant.
The filtering outer cylinder, filtering middle cylinder and filtering inner cylinder structure are adopted, and the filtering outer cylinder side wall is provided with a first filter hole, and the filtering inner cylinder side wall is provided with a second filter hole. The filtering inner cylinder can block larger particles and impurities. Seawater enters the second inner hole of the filtering inner cylinder through the filtering middle cylinder and the second filtering hole to ensure smooth flow of medium into the nuclear power plant.
It effectively avoids the problem of impurity sealing, ensures the efficiency of water supply in nuclear power plants and the stability of filters, and ensures the normal operation of nuclear power plants.
Smart Images
Figure CN223112487U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of nuclear power plant filtration devices, and particularly relates to a sump filtration mechanism and a sump filter. Background Technique
[0002] The sump provided at the bottom of the reactor containment of a pressurized water reactor nuclear power plant is used to collect the coolant from the primary circuit during a major leakage. After a reference accident occurs in a pressurized water reactor nuclear power plant (such as a coolant loss accident, a main steam pipe rupture accident, etc.), the coolant enters the containment sump through the break. After being filtered by the containment sump filter, the coolant will then enter the safety injection system and the safety spray system through devices such as pumps, and then be used for reactor cooling to avoid severe damage to the reactor core and overpressure of the containment.
[0003] Therefore, the containment sump filter is an important device in the safety system of a pressurized water reactor nuclear power plant. The working condition of the containment sump filter under cyclic conditions will directly affect the normal operation of the safety injection system and the safety spray system. A large amount of insulation materials and debris of other materials are mixed in the coolant that enters the containment sump after an accident. These substances must be filtered out by the sump filter to ensure the safe operation of the safety injection system and the containment spray system.
[0004] In the prior art, the sump filter includes a filter outer cylinder and a filter inner cylinder installed in the filter outer cylinder. Seawater is filtered through the double filtration of the filter outer cylinder and the filter inner cylinder and then input into the nuclear power plant. However, during the process of filtering seawater by the filter outer cylinder and the filter inner cylinder, accidents such as impurity blockage of the filter outer cylinder and the filter inner cylinder are likely to occur, thus affecting the water supply efficiency of the nuclear power plant. Summary of the Invention
[0005] In view of the above technical problems, the embodiment of the utility model provides a sump filtration mechanism, which includes a filter outer cylinder, a filter middle cylinder and a filter inner cylinder arranged coaxially; the filter outer cylinder is sleeved on the filter middle cylinder, and the filter middle cylinder is sleeved on the filter inner cylinder;
[0006] A plurality of first filter holes are provided on the side wall of the filter outer cylinder, and a plurality of second filter holes are provided on the side wall of the filter inner cylinder; the medium to be filtered sequentially passes through the first filter holes, the filter middle cylinder and the second filter holes and then flows into the second inner hole of the filter inner cylinder.
[0007]
[0008] Optionally, the pit filtering mechanism further includes a plug cover, which is provided with a convex portion and an annular groove disposed around the convex portion; the tops of the outer filter cylinder, the middle filter cylinder, and the inner filter cylinder are all inserted into the annular groove, and the convex portion is inserted into the second inner hole;
[0009] The convex portion is provided with a plurality of third filter holes communicating with the second inner hole.
[0010] Optionally, the bottom of the outer filter cylinder is provided with an inner bottom plate extending towards the middle of the second inner hole, and the inner bottom plate is provided with a first through hole communicating with the second inner hole;
[0011] The bottoms of the middle filter cylinder and the inner filter cylinder are both abutted against the inner bottom plate.
[0012] Optionally, the pit filtering mechanism further includes a filter plug installed in the second inner hole, the filter plug is provided with a plurality of fourth filter holes communicating with the second inner hole, and the filter plug is abutted against the inner bottom plate.
[0013] Optionally, the bottom of the outer filter cylinder is provided with an outer bottom plate extending in a direction away from the second inner hole, and the outer bottom plate is used for installation on the outer filter cylinder.
[0014] Optionally, the inner diameter of the first filter hole is larger than the inner diameter of the second filter hole.
[0015] Another embodiment of the present invention further provides a pit filter, which includes a base provided with a second through hole and the above-mentioned pit filtering mechanism; the outer filter cylinder is installed on the base, and the second inner hole communicates with the second through hole.
[0016] Optionally, the base includes a box body and a plurality of support frames installed on the box body, the bottom of the outer filter cylinder is installed on the outer wall of the box body, and the top of the outer filter cylinder is installed on the support frames; the second through hole is provided on the box body.
[0017] Optionally, the bottom of the outer filter cylinder is provided with an outer bottom plate extending in a direction away from the second inner hole, and a plurality of side grooves are further provided on the side wall of the box body, and the bottom of the outer filter cylinder is correspondingly installed in the side grooves through the outer bottom plate.
[0018] Optionally, the opposite ends of the box body are respectively provided with a first flanging and a second flanging.
[0019] In the present utility model, the filter outer cylinder is sleeved on the filter middle cylinder, and the filter middle cylinder is sleeved on the filter inner cylinder; a plurality of first filter holes are provided on the side wall of the filter outer cylinder, and a plurality of second filter holes are provided on the side wall of the filter inner cylinder; when the medium to be filtered enters the first inner holes of the first filter holes through the first filter cylinder, the filter middle cylinder can block impurities with larger particles outside the filter outer cylinder, and seawater and the like can pass through the filter middle cylinder and the second filter holes and enter the second inner holes, and the seawater and the like in the second filter holes can flow into the nuclear power plant, thereby completing the filtering of the medium to be filtered in the nuclear power plant. In the present utility model, the filter middle cylinder can prevent impurities with larger particles from entering the inside of the pit filter mechanism, avoiding the blockage problem caused by the entry of impurities into the inside, and ensuring the water supply efficiency of the nuclear power plant. In addition, the design of the second filter holes on the filter inner cylinder enables the medium filtered by the filter middle cylinder to smoothly flow into the second inner holes through the second filter holes, further ensuring the stability of the pit filter mechanism. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The present utility model will be further described below with reference to the drawings and embodiments.
[0021] Figure 1 is a schematic structural diagram of a pit filter mechanism provided by an embodiment of the present utility model;
[0022] Figure 2 is an exploded structural diagram of a pit filter mechanism provided by an embodiment of the present utility model;
[0023] Figure 3 is a schematic cross-sectional structural diagram of a pit filter mechanism provided by an embodiment of the present utility model;
[0024] Figure 4 is a schematic structural diagram of a plug cover of a pit filter provided by an embodiment of the present utility model;
[0025] Figure 5 is a schematic structural diagram of a pit filter provided by an embodiment of the present utility model;
[0026] Figure 6 is a schematic structural diagram of a base of a pit filter provided by an embodiment of the present utility model.
[0027] The reference numerals in the specification are as follows:
[0028] 1. Pit filtration mechanism; 11. Outer filtration cylinder; 111. First filtration hole; 112. Inner bottom plate; 113. Outer bottom plate; 12. Middle filtration cylinder; 13. Inner filtration cylinder; 131. Second filtration hole; 132. Second inner hole; 14. Plug cover; 141. Convex part; 142. Annular groove; 143. Third filtration hole; 15. Filtration plug; 151. Fourth filtration hole;
[0029] 2. Base; 21. Box body; 211. Second through hole; 212. Side groove; 213. First flanging; 214. Second flanging; 22. Support frame. Detailed implementation manners
[0030] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer and more 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.
[0031] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "middle", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the 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.
[0032] As Figures 1 to 3 shown, a pit filtration mechanism 1 provided by an embodiment of the present utility model includes an outer filtration cylinder 11, a middle filtration cylinder 12 and an inner filtration cylinder 13 which are coaxially arranged; the outer filtration cylinder 11 is sleeved on the middle filtration cylinder 12, and the middle filtration cylinder 12 is sleeved on the inner filtration cylinder 13; it can be understood that the inner diameter of the outer filtration cylinder 11 is greater than the outer diameter of the middle filtration cylinder 12, and the inner diameter of the middle filtration cylinder 12 is greater than the outer diameter of the inner filtration cylinder 13.
[0033] A plurality of first filtration holes 111 are provided on the side wall of the outer filtration cylinder 11, and a plurality of second filtration holes 131 are provided on the side wall of the inner filtration cylinder 13; the medium to be filtered (such as seawater, coolant, etc.) flows into the second inner hole 132 of the inner filtration cylinder 13 after sequentially passing through the first filtration holes 111, the middle filtration cylinder 12 and the second filtration holes 131. As a preference, the inner diameter of the first filtration holes 111 is greater than the inner diameter of the second filtration holes 131. It can be understood that the side wall of the outer filtration cylinder 11 is covered with the first filtration holes 111, and the side wall of the inner filtration cylinder 13 is covered with the second filtration holes 131; the middle filtration cylinder 12 can be a cylindrical structure wound by foam material.
[0034] In the present utility model, the filtering outer cylinder 11 is sleeved on the filtering middle cylinder 12, and the filtering middle cylinder 12 is sleeved on the filtering inner cylinder 13; a plurality of first filtering holes 111 are provided on the side wall of the filtering outer cylinder 11, and a plurality of second filtering holes 131 are provided on the side wall of the filtering inner cylinder 13; when the medium to be filtered enters the first inner hole of the first filtering hole 111 through the first filtering cylinder, the filtering middle cylinder 12 can block impurities with larger particles outside the filtering outer cylinder 11, and seawater and the like can pass through the filtering middle cylinder 12 and the second filtering holes 131 and enter the second inner hole 132. The seawater and the like in the second filtering holes 131 can flow into the nuclear power plant, thereby completing the filtering of the medium to be filtered in the nuclear power plant. In the present utility model, the filtering middle cylinder 12 can prevent impurities with larger particles from entering the inside of the sump filtering mechanism 1, avoiding the blockage problem caused by the entry of impurities into the inside, and ensuring the water supply efficiency of the nuclear power plant. In addition, the design of the second filtering holes 131 on the filtering inner cylinder 13 enables the medium filtered by the filtering middle cylinder 12 to smoothly flow into the second inner hole 132 through the second filtering holes 131, further ensuring the stability of the sump filtering mechanism 1.
[0035] In one embodiment, as Figures 1 to 4 shown, the sump filtering mechanism 1 further includes a plug cover 14, and the plug cover 14 is provided with a convex portion 141 and an annular groove 142 arranged around the convex portion 141; the tops of the filtering outer cylinder 11, the filtering middle cylinder 12, and the filtering inner cylinder 13 are all inserted into the annular groove 142, and the convex portion 141 is inserted into the second inner hole 132; a plurality of third filtering holes 143 communicating with the second inner hole 132 are provided on the convex portion 141. It can be understood that the convex portion 141 is arranged at the central part of the plug cover 14, and the convex portion 141 abuts against the inner side wall of the filtering inner cylinder 13.
[0036] In this embodiment, the plug cover 14 is installed on the tops of the filtering outer cylinder 11, the filtering middle cylinder 12, and the filtering inner cylinder 13, the convex portion 141 is inserted into the second inner hole 132, and the tops of the filtering outer cylinder 11, the filtering middle cylinder 12, and the filtering inner cylinder 13 are all inserted into the annular groove 142. Thus, the plug cover 14 ensures the stability of the filtering outer cylinder 11, the filtering middle cylinder 12, and the filtering inner cylinder 13 sleeved together. In addition, the external medium to be filtered can also enter the second inner hole 132 through the third filtering holes 143, further ensuring the smoothness of the external medium to be filtered flowing into the second inner hole 132.
[0037] In one embodiment, as Figure 3As shown, a bottom of the filter outer cylinder 11 is provided with an inner bottom plate 112 extending towards a middle part of the second inner hole 132. A first through hole communicating with the second inner hole 132 is provided on the inner bottom plate 112. Bottoms of the filter middle cylinder 12 and the filter inner cylinder 13 are both abutted against the inner bottom plate 112. Understandably, a medium to be filtered in the second inner hole 132 can flow out through the first through hole.
[0038] Specifically, when the filter middle cylinder 12 and the filter inner cylinder 13 are installed in a first inner hole of the filter outer cylinder 11, bottoms of the filter middle cylinder 12 and the filter inner cylinder 13 are abutted against the inner bottom plate 112, and tops of the filter outer cylinder 11, the filter middle cylinder 12 and the filter inner cylinder 13 are all inserted into the annular groove 142, further ensuring the stability of the filter outer cylinder 11, the filter middle cylinder 12 and the filter inner cylinder 13 sleeved together.
[0039] In an embodiment, as Figure 2 and Figure 3 shown, the pit filter mechanism 1 further includes a filter plug 15 installed in the second inner hole 132. A plurality of fourth filter holes 151 communicating with the second inner hole 132 are provided on the filter plug 15, and the filter plug 15 is abutted against the inner bottom plate 112. Understandably, the filter plug 15 is installed at a bottom of the second inner hole 132, and the medium to be filtered in the second inner hole 132 can flow out through the fourth filter holes 151, so that impurities with larger particles are intercepted by the filter plug 15 in the second inner hole 132, further ensuring the filtering effect of the pit filter mechanism 1.
[0040] Further illustrated, an inner diameter of the third filter hole 143 is smaller than an inner diameter of the second filter hole 131 and smaller than an inner diameter of the third filter hole 143.
[0041] In an embodiment, as Figure 1 and Figure 5 shown, a bottom of the filter outer cylinder 11 is provided with an outer bottom plate 113 extending in a direction away from the second inner hole 132. The outer bottom plate 113 is used for being installed on the filter outer cylinder 11. Understandably, the outer bottom plate 113 is equivalent to a turned-out edge of the filter outer cylinder 11, and the design of the outer bottom plate 113 facilitates the disassembly and assembly of the pit filter mechanism 1.
[0042] As Figure 5As shown in the figure, another embodiment of the present utility model further provides a pit filter, which includes a base 2 provided with a second through hole 211 and a plurality of the above-mentioned pit filtering mechanisms 1; the filtering outer cylinder 11 is installed on the base 2, and the second inner hole 132 communicates with the second through hole 211. It can be understood that the number of the pit filtering mechanisms 1 installed on the base 2 can be set according to actual needs. For example, the pit filtering mechanisms 1 are provided with 8, 10, 12, etc.; the design of the plurality of pit filtering mechanisms 1 enables the flow rate of the medium to be filtered by the pit filter per unit time.
[0043] In one embodiment, as Figure 5 and Figure 6 shown, the base 2 includes a box body 21 and a plurality of support frames 22 installed on the box body 21. The bottom of the filtering outer cylinder 11 is installed on the outer wall of the box body 21, and the top of the filtering outer cylinder 11 is installed on the support frames 22; the second through hole 211 is provided on the box body 21. It can be understood that the support frames 22 are installed on the surface of the box body 21, the bottom of the pit filtering mechanism 1 is installed on the surface of the box body 21, and the top of the pit filtering mechanism 1 is installed on the support frames 22. Thus, the support frames 22 can play a role in supporting the pit filtering mechanism 1, ensuring the stability of the pit filtering mechanism 1 installed on the base 2.
[0044] In one embodiment, as Figure 1 , Figure 5 and Figure 6 shown, the bottom of the filtering outer cylinder 11 is provided with an outer bottom plate 113 extending in a direction away from the second inner hole 132. A plurality of side grooves 212 are further provided on the side wall of the box body 21. The bottom of the filtering outer cylinder 11 is installed in the side grooves 212 one by one through the outer bottom plate 113. It can be understood that the outer bottom plate 113 is installed in the side grooves 212, so that the outer bottom plate 113 can play a role in filling the side grooves 212, further ensuring the stability of the pit filtering mechanism 1 installed on the base 2.
[0045] In one embodiment, as Figure 5 and Figure 6 shown, opposite ends of the box body 21 are respectively provided with a first flanging 213 and a second flanging 214. It can be understood that the first flanging 213 and the second flanging 214 are respectively arranged at the left and right ends of the box body 21, and both the first flanging 213 and the second flanging 214 are arranged around the opening of the box body 21. In this embodiment, the design of the first flanging 213 and the second flanging 214 facilitates the connection of the box body 21 to an external pipeline.
[0046] The above are only examples of the pit filtering mechanism and the pit filter of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A pit filtering mechanism, characterized in that, It includes a filtering outer cylinder, a filtering middle cylinder, and a filtering inner cylinder that are coaxially arranged; the filtering outer cylinder is sleeved on the filtering middle cylinder, and the filtering middle cylinder is sleeved on the filtering inner cylinder; A plurality of first filtering holes are provided on the side wall of the filtering outer cylinder, and a plurality of second filtering holes are provided on the side wall of the filtering inner cylinder; The medium to be filtered flows into the second inner hole of the filtering inner cylinder after sequentially passing through the first filtering holes, the filtering middle cylinder, and the second filtering holes.
2. The pit filtering mechanism according to claim 1, characterized in that, The pit filtering mechanism further includes a plug cover, and the plug cover is provided with a convex portion and an annular groove arranged around the convex portion; the tops of the filtering outer cylinder, the filtering middle cylinder, and the filtering inner cylinder are all inserted into the annular groove, and the convex portion is inserted into the second inner hole; A plurality of third filtering holes communicating with the second inner hole are provided on the convex portion.
3. The pit filtering mechanism according to claim 1, characterized in that, The bottom of the filtering outer cylinder is provided with an inner bottom plate extending towards the middle of the second inner hole, and a first through hole communicating with the second inner hole is provided on the inner bottom plate; The bottoms of the filtering middle cylinder and the filtering inner cylinder are both in contact with the inner bottom plate.
4. The pit filtering mechanism according to claim 3, characterized in that, The pit filtering mechanism further includes a filtering plug installed in the second inner hole, and a plurality of fourth filtering holes communicating with the second inner hole are provided on the filtering plug, and the filtering plug is in contact with the inner bottom plate.
5. The pit filtering mechanism according to claim 1, characterized in that, The bottom of the filtering outer cylinder is provided with an outer bottom plate extending in a direction away from the second inner hole, and the outer bottom plate is used for installation on the filtering outer cylinder.
6. The pit filtration mechanism according to claim 1, characterized in that, The inner diameter of the first filtering hole is larger than the inner diameter of the second filtering hole.
7. A pit filter, characterized in that, It includes a base provided with a second through hole and a plurality of pit filtering mechanisms as described in any one of claims 1 to 6; the filtering outer cylinder is installed on the base, and the second inner hole communicates with the second through hole.
8. The sump filter according to claim 7, characterized in that, The base includes a box body and a plurality of support frames installed on the box body. The bottom of the filtering outer cylinder is installed on the outer wall of the box body, and the top of the filtering outer cylinder is installed on the support frames; the second through hole is provided on the box body.
9. The pit filter according to claim 8, characterized in that, The bottom of the filtering outer cylinder is provided with an outer bottom plate extending in a direction away from the second inner hole, and a plurality of side grooves are further provided on the side wall of the box body. The bottom of the filtering outer cylinder is correspondingly installed in the side grooves through the outer bottom plate.
10. The pit filter according to claim 8, wherein, The two opposite ends of the box body are respectively provided with a first flanging and a second flanging.