Fan pit filtering mechanism and containment pit filter

Abstract

The utility model belongs to the technical field of nuclear power station containment vessels, and particularly relates to a fan pit filtering mechanism and a containment vessel pit filter. The fan pit filtering mechanism comprises a fan assembly, a filtering outer cylinder and a filtering inner cylinder, the filtering outer cylinder and the filtering inner cylinder are coaxially arranged, the filtering inner cylinder is installed in a first inner hole of the filtering inner cylinder, and an annular space is formed between the filtering outer cylinder and the filtering inner cylinder. The fan assembly comprises a fan shaft and a fan body rotationally installed on the fan shaft, the two opposite ends of the fan shaft are connected with the outer filtering cylinder and the inner filtering cylinder correspondingly, and the fan body is located in the annular space. In the embodiment of the invention, the rotating fan body enables the water flow to generate an eddy effect in the filtering outer cylinder, and the water flow speed of the filtering inner cylinder is increased, so that impurities are not easy to attach to the filtering holes of the filtering outer cylinder and the filtering inner cylinder, and the risk of blockage of the fan pit filtering mechanism is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of nuclear power plant containment, in particular to a fan pit filtering mechanism and a containment pit filter. Background Art

[0002] Nuclear power plants typically have pits within their reactors to collect and store cooling water from the plant's primary circuit in the event of a major leak. This water is pumped into the safety injection system (RIS) and containment spray system (EAS) before being fed back into the reactors for cooling. However, in the event of an accident or other debris generation, cooling water mixed with large amounts of insulation and other material fragments can enter the containment pit through breaches. This necessitates the installation of pit filtration devices to filter out these impurities, as these impurities could affect the safety functions of the safety injection system and containment spray system.

[0003] In the prior art, pit filters are commonly used to filter water from pits. Specifically, the water in the pit is filtered through the pit filter before being fed into the safety injection system and the containment spray system. The pit filter typically comprises an outer filter cylinder and an inner filter cylinder mounted within the outer filter cylinder. Water undergoes dual filtration by the outer and inner filter cylinders before being safely injected into the containment spray system and the containment spray system. However, the water may contain soft impurities such as clods of soil. These soft impurities can easily block the outer and inner filter cylinders when passing through them. Summary of the Invention

[0004] The utility model aims to solve the technical problem in the prior art that an outer filter cylinder and an inner filter cylinder are easily blocked by impurities during the process of filtering seawater, and provides a fan pit filter mechanism and a containment pit filter.

[0005] In view of the above technical problems, an embodiment of the present utility model provides a fan pit filter mechanism, comprising a fan assembly and a coaxially arranged filter outer cylinder and filter inner cylinder, wherein the filter inner cylinder is installed in the first inner hole of the filter inner cylinder, and an annular space is provided between the filter outer cylinder and the filter inner cylinder;

[0006] The fan assembly includes a fan shaft and a fan body rotatably mounted on the fan shaft. The opposite ends of the fan shaft are respectively connected to the filter outer cylinder and the filter inner cylinder. The fan body is located in the annular space.

[0007] Optionally, the outer filter cylinder is provided with a first through hole, the inner filter cylinder is provided with a second through hole, and the fan assembly further includes a first fastener and a second fastener;

[0008] The first fastener is mounted on the fan shaft. One end of the fan shaft away from the first fastener passes through the first through hole, the annular space and the second through hole in sequence. The second fastener is mounted on the fan shaft and abuts against the inner wall of the filter inner cylinder.

[0009] Optionally, the side wall of the filter inner cylinder is covered with first filter holes, and the side wall of the filter inner cylinder is covered with second filter holes;

[0010] The fan pit filter mechanism further comprises a filter end cover, which is covered with third filter holes; the filter end cover is covered on the filter outer cylinder.

[0011] Optionally, an annular bottom plate extending toward the first inner hole is provided at one end of the filter outer cylinder away from the filter end cover, and an end of the filter inner cylinder away from the filter end cover abuts against the annular bottom plate.

[0012] Optionally, the inner diameter of the first filter hole is larger than the inner diameter of the second filter hole.

[0013] Optionally, the fan pit filter mechanism includes a plurality of fan assemblies arranged in the annular space at intervals along the circumference of the filter outer cylinder.

[0014] Optionally, the fan pit filter mechanism includes a plurality of filter mechanisms arranged in the annular space along the axial direction of the filter outer cylinder, and each of the filter mechanisms includes a plurality of fan assemblies arranged in the annular space along the circumferential direction of the filter outer cylinder.

[0015] Another embodiment of the present invention further provides a containment pit filter, comprising a base provided with a third through hole and a plurality of the above-mentioned fan pit filter mechanisms; the filter outer cylinder is mounted on the base, and the second inner hole of the filter inner cylinder is connected to the third through hole.

[0016] Optionally, a first flange and a second flange are respectively provided at opposite ends of the base, and the first flange and the second flange are both arranged around the third through hole.

[0017] In the present invention, during the radial flow of water along the filter outer cylinder, the water first passes through the filtering effect of the filter outer cylinder and then enters the annular space. The water flow will drive the fan body to rotate on the fan shaft. The rotating fan body will cause the water flow to produce a vortex effect in the filter outer cylinder, and increase the water flow speed of the filter inner cylinder, so that impurities are not easily attached to the filter holes of the filter outer cylinder and the filter inner cylinder, reducing the risk of blockage of the fan pit filter mechanism; and the fan pit filter mechanism has a simple structure and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a structural diagram of a fan pit filter mechanism provided by an embodiment of the present utility model;

[0020] Figure 2 This is a top view of a fan pit filter mechanism provided by one embodiment of the present utility model;

[0021] Figure 3 This is a schematic diagram of the exploded structure of a fan pit filter mechanism provided by one embodiment of the present utility model;

[0022] Figure 4 It is a cross-sectional perspective view of a fan pit filter mechanism provided by one embodiment of the present utility model;

[0023] Figure 5 It is a structural schematic diagram of a containment pit filter provided by one embodiment of the utility model.

[0024] The reference numerals in the specification are as follows:

[0025] 1. Fan pit filter mechanism; 11. Fan assembly; 111. Fan shaft; 112. Fan body; 113. First fastener; 114. Second fastener; 12. Filter outer cylinder; 121. First filter hole; 122. Annular bottom plate; 13. Filter inner cylinder; 131. Second filter hole; 14. Annular space; 15. Filter end cap; 151. Third filter hole; 2. Base; 21. Third through hole; 22. First flange; 23. Second flange. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is 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 invention and are not intended to limit the present invention.

[0027] It should be understood that the terms "upper", "lower", "left", "right", "front", "back", "middle", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 invention.

[0028] like Figures 1 to 4As shown, an embodiment of the utility model provides a fan pit filter mechanism 1, including a fan assembly 11 and a coaxially arranged filter outer cylinder 12 and filter inner cylinder 13, the filter inner cylinder 13 is installed in the first inner hole of the filter inner cylinder 13, and an annular space 14 is provided between the filter outer cylinder 12 and the filter outer cylinder 12; it can be understood that the inner diameter of the filter outer cylinder 12 is larger than the outer diameter of the filter inner cylinder 13, and the filter outer cylinder 12 and the filter inner cylinder 13 are both covered with filter holes.

[0029] The fan assembly 11 includes a fan shaft 111 and a fan body 112 rotatably mounted on the fan shaft 111. Opposite ends of the fan shaft 111 are connected to the outer filter cylinder 12 and the inner filter cylinder 13, respectively. The fan body 112 is located in the annular space 14. It is understood that the fan body 112 can be rotatably mounted on the fan shaft 111 via bearings or the like.

[0030] Specifically, the water is filtered in sequence by the outer filter cylinder 12 and the inner filter cylinder 13 and then input into the safety injection system and the containment spray system of the nuclear power plant.

[0031] In the present invention, in the process of radial flow of water along the filter outer cylinder 12, it first passes through the filtering effect of the filter outer cylinder 12 and then enters the annular space 14. The water flow will drive the fan body 112 to rotate on the fan shaft 111. The rotating fan body 112 causes the water flow to produce a vortex effect in the filter outer cylinder 12 and increases the water flow speed of the filter inner cylinder 13, so that impurities are not easily attached to the filter holes of the filter outer cylinder 12 and the filter inner cylinder 13, reducing the risk of blockage of the fan pit filter mechanism 1; and the fan pit filter mechanism 1 has a simple structure and low manufacturing cost.

[0032] In one embodiment, if Figure 2 As shown, the filter outer cylinder 12 is provided with a first through hole, the filter inner cylinder 13 is provided with a second through hole, and the fan assembly 11 further includes a first fastener 113 and a second fastener 114; it can be understood that the first fastener 113 and the second fastener 114 both include but are not limited to nuts, etc.

[0033] The first fastener 113 is mounted on the fan shaft 111. The end of the fan shaft 111 away from the first fastener 113 passes through the first through hole, the annular space 14, and the second through hole in sequence. The second fastener 114 is mounted on the fan shaft 111 and abuts against the inner wall of the filter inner cylinder 13. It can be understood that one end of the fan shaft 111 is located outside the filter outer cylinder 12, and the other end of the fan shaft 111 is located inside the filter inner cylinder 13. The first fastener 113 can serve to fix the fan shaft 111 to the filter outer cylinder 12, and the second fastener 114 can serve to fix the fan shaft 111 to the filter inner cylinder 13. In this embodiment, the design of the first fastener 113 and the second fastener 114 improves the convenience of disassembly and assembly of the fan pit filter mechanism 1.

[0034] In one embodiment, if Figure 1 and Figure 3 As shown, the side wall of the filter inner cylinder 13 is covered with first filter holes 121, and the side wall of the filter inner cylinder 13 is covered with second filter holes 131; the fan pit filter mechanism 1 also includes a filter end cover 15, and the filter end cover 15 is covered with third filter holes 151; the filter end cover 15 covers the filter outer cylinder 12. It can be understood that the filter end cover 15 covers the top of the filter outer cylinder 12, and the top of the filter outer cylinder 12 is connected to the through hole of the nuclear power plant base 2, so that the external water flows through the filtering action of the filter end cover 15, the filter outer cylinder 12, and the filter inner cylinder 13, and then flows into the through hole of the base 2. In this embodiment, the design of the filter end cover 15 further improves the filtering effect of the fan pit filter mechanism 1.

[0035] In one embodiment, if Figure 4 As shown, an annular bottom plate 122 extending toward the first inner hole is provided at the end of the filter outer cylinder 12 away from the filter end cap 15, and the end of the filter inner cylinder 13 away from the filter end cap 15 abuts against the annular bottom plate 122. It is understood that the annular bottom plate 122 and the filter outer cylinder 12 are integrally formed, and the annular bottom plate 122 can support the filter inner cylinder 13 from the bottom, ensuring the stability of the filter inner cylinder 13 installed in the filter outer cylinder 12.

[0036] In one embodiment, if Figure 1 As shown, the inner diameter of the first filter hole 121 is larger than the inner diameter of the second filter hole 131. The water flow is first filtered by the first filter hole 121 and then filtered by the second filter hole 131, so that the outer filter cylinder 12 and the inner filter cylinder 13 have a dual filtering effect.

[0037] In one embodiment, if Figure 1 As shown, the fan pit filter mechanism 1 includes a plurality of fan assemblies 11 arranged in the annular space 14 at intervals along the circumference of the filter outer cylinder 12. It is understood that the number of fan assemblies 11 can be set according to actual needs, for example, 4, 6, etc. fan assemblies 11 are provided. In this embodiment, the plurality of fan assemblies 11 are distributed in an annular manner, so that no matter where the water tank flows radially from the filter outer cylinder 12, the fan assemblies 11 are present to stir the water flow, further ensuring the stirring effect of the fan assemblies 11 on the water flow.

[0038] In one embodiment, if Figure 1 As shown, the fan pit filter mechanism 1 includes multiple filter mechanisms spaced axially along the filter outer cylinder 12 and arranged in the annular space 14. Each filter mechanism includes multiple fan assemblies 11 spaced circumferentially along the filter outer cylinder 12 and arranged in the annular space 14. It is understood that the number of fan mechanisms can be set according to actual needs, for example, two or three fan mechanisms can be provided. In this embodiment, because the filter outer cylinder 12 and the filter inner cylinder 13 are both relatively long, the design of multiple fan mechanisms further ensures the agitation effect of the fan assemblies 11 on the water flow.

[0039] like Figure 5 As shown, another embodiment of the present invention further provides a containment pit filter, comprising a base 2 provided with a third through hole 21 and a plurality of the above-mentioned fan pit filter mechanisms 1; the filter outer cylinder 12 is mounted on the base 2, and the second inner hole of the filter inner cylinder 13 is connected to the third through hole 21. It can be understood that the third through hole 21 of the base 2 is used to input moisture into the safety injection system and the containment spray system of the nuclear power plant; the number of the fan pit filter mechanisms 1 installed on the base 2 can be set according to actual needs, for example, the fan pit filter mechanisms 1 are provided with 6, 8, and 10, etc.; the design of the plurality of fan pit filter mechanisms 1 makes the flow rate of the medium to be filtered filtered by the containment pit filter per unit time.

[0040] In one embodiment, if Figure 5 As shown, the base 2 is provided with a first flange 22 and a second flange 23 at opposite ends thereof, and the first flange 22 and the second flange 23 are both provided around the third through hole 21. It can be understood that the first flange 22 and the second flange 23 are equivalent to flanges on the base 2, thereby facilitating the installation of the base 2.

[0041] The above are merely embodiments of the fan pit filter mechanism and the containment pit filter of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A fan pit filter mechanism, characterized in that: The fan assembly comprises a filter outer cylinder and a filter inner cylinder which are coaxially arranged, wherein the filter inner cylinder is installed in the first inner hole of the filter inner cylinder, and an annular space is provided between the filter outer cylinder and the filter inner cylinder; The fan assembly includes a fan shaft and a fan body rotatably mounted on the fan shaft. The opposite ends of the fan shaft are respectively connected to the filter outer cylinder and the filter inner cylinder. The fan body is located in the annular space.

2. The fan pit filter mechanism according to claim 1, characterized in that: The outer filter cylinder is provided with a first through hole, the inner filter cylinder is provided with a second through hole, and the fan assembly further includes a first fastener and a second fastener; The first fastener is mounted on the fan shaft. One end of the fan shaft away from the first fastener passes through the first through hole, the annular space and the second through hole in sequence. The second fastener is mounted on the fan shaft and abuts against the inner wall of the filter inner cylinder.

3. The fan pit filter mechanism according to claim 1, characterized in that: The side wall of the filter inner cylinder is covered with first filter holes, and the side wall of the filter inner cylinder is covered with second filter holes; The fan pit filter mechanism further comprises a filter end cover, which is covered with third filter holes; the filter end cover is covered on the filter outer cylinder.

4. The fan pit filter mechanism according to claim 3, characterized in that: An end of the filter outer cylinder away from the filter end cover is provided with an annular bottom plate extending toward the first inner hole, and an end of the filter inner cylinder away from the filter end cover is in contact with the annular bottom plate.

5. The fan pit filter mechanism according to claim 3, characterized in that: The inner diameter of the first filter hole is larger than the inner diameter of the second filter hole.

6. The fan pit filter mechanism according to claim 1, characterized in that: The fan pit filter mechanism includes a plurality of fan assemblies arranged in the annular space at intervals along the circumference of the filter outer cylinder.

7. The fan pit filter mechanism according to claim 6, characterized in that: The fan pit filter mechanism includes a plurality of filter mechanisms arranged in the annular space along the axial direction of the filter outer cylinder at intervals, and each of the filter mechanisms includes a plurality of fan assemblies arranged in the annular space along the circumferential direction of the filter outer cylinder at intervals.

8. A containment pit filter, characterized in that: It comprises a base provided with a third through hole and a plurality of fan pit filter mechanisms according to any one of claims 1 to 6; the filter outer cylinder is mounted on the base, and the second inner hole of the filter inner cylinder is connected to the third through hole.

9. The containment pit filter according to claim 8, characterized in that: A first flange and a second flange are respectively provided at opposite ends of the base, and the first flange and the second flange are both provided around the third through hole.

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