Filter cartridges for high-flow nuclear power plant water treatment

Abstract

This invention provides a filter cartridge for high-flow-rate nuclear power plant water treatment, comprising a first end cap, an outer filter cartridge, an inner filter cartridge, and a second end cap. Two first end caps are provided, arranged parallel and spaced apart, each with a water inlet hole. The outer filter cartridge is connected to both first end caps at its two ends and has a cavity. The inner filter cartridge is located within the cavity and is coaxially arranged with the outer filter cartridge. One end of the inner filter cartridge is connected to one of the first end caps. The other end of the inner filter cartridge has a second end cap. An annular water inlet cavity is formed between the inner and outer filter cartridges. The filter cartridge for high-flow-rate nuclear power plant water treatment provided by this invention effectively increases the filtration area by nearly double based on a fixed size, further adapting to the filtration of high-flow-rate nuclear power plant water and further improving filtration efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of filter element technology, specifically relating to a filter element for high-flow nuclear power plant water treatment. Background Technology

[0002] When it comes to filtration of water in nuclear power plants, filter cartridges are usually used. Since the flow rate of water in nuclear power plants is relatively large, the requirements for filter cartridges are relatively high in order to ensure filtration efficiency.

[0003] In existing technologies, commonly used high-flow-rate filter cartridges typically consist of two coaxially arranged conical layers, each made of a perforated plate. At least two layers of filter screens are welded to the inner wall of the outer conical layer. Wastewater enters through one end of the inner conical layer, then passes through the two conical layers and the filter screens before being discharged to the outside. While this structure achieves filtration, the limited installation space within the filter restricts the cartridge size, preventing further improvements in filtration efficiency for high-flow-rate nuclear power plant water. Furthermore, the filter screens are sandwiched between the two conical layers, making installation and maintenance difficult. Utility Model Content

[0004] This utility model provides a filter element for high-flow nuclear power plant water treatment, which aims to solve the problem that existing filter elements used in high-flow nuclear power plant water filtration cannot continue to improve filtration efficiency.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a filter element for high-flow nuclear power plant water treatment, comprising:

[0006] The first end cap is provided in two, and the two first end caps are arranged in parallel and spaced apart. Each first end cap is provided with a water outlet.

[0007] An outer filter cartridge is connected to two of the first end caps at both ends, and the outer filter cartridge has a cavity.

[0008] An inner filter cylinder is located in the cylinder cavity and is coaxially arranged with the outer filter cylinder; one end of the inner filter cylinder is connected to one of the first end caps; the other end of the inner filter cylinder is provided with a second end cap; an annular water inlet cavity is formed between the inner filter cylinder and the outer filter cylinder;

[0009] Water entering the annular inlet chamber through a water outlet hole on another first end cap is filtered through the outer filter cylinder and the inner filter cylinder, respectively; water after passing through the inner filter cylinder is discharged through the corresponding water outlet hole on the first end cap.

[0010] In one possible implementation, the filter element for high-flow nuclear power plant water treatment further includes a central column, which is coaxially arranged with the outer filter cylinder or the inner filter cylinder for fixed connection of each of the first end caps and the second end caps.

[0011] In one possible implementation, the outer filter cartridge includes:

[0012] The first cylindrical segment is connected at one end to one of the first end caps;

[0013] The conical segment has a large-diameter end and a small-diameter end. The large-diameter end of the conical segment corresponds to one end of the first cylindrical segment, and the small-diameter end of the conical segment is connected to another first end cap. The conical segment and the first cylindrical segment are combined to form the cylindrical cavity.

[0014] In one possible implementation, the filter element for high-flow nuclear power plant water treatment further includes an auxiliary support ring, which is fixed on the central column and located between the first cylindrical section and the conical section, and provides a fixed connection between the first cylindrical section and the conical section.

[0015] In one possible implementation, the inner filter cylinder includes two second cylindrical sections, which are respectively located on both sides of the auxiliary support ring and fixedly connected to the auxiliary support ring; one end of one of the second cylindrical sections away from the auxiliary support ring is connected to one of the first end caps; and the other end of the second cylindrical section away from the auxiliary support ring is connected to the second end cap.

[0016] In one possible implementation, the auxiliary support ring is provided with a plurality of water passage holes, each of which is located between the first cylindrical segment and the second cylindrical segment.

[0017] In one possible implementation, the second end cap is provided with a plurality of water inlet holes, and a mesh covering the second end cap is provided to cover each of the water inlet holes.

[0018] In one possible implementation, both the outer filter cylinder and the inner filter cylinder are formed by sintering a perforated plate with at least two layers of wire mesh and then rolling it up.

[0019] In this implementation, the two first end caps provide support for the outer and inner filter cartridges, ensuring the stability of their combined configuration. The annular inlet chamber formed between the outer and inner filter cartridges connects to the filter's inlet channel via drainage holes on the corresponding end caps. Water within the annular inlet chamber is filtered simultaneously by both the outer and inner filter cartridges. A portion of the water exits directly after the outer filter cartridge, while another portion passes through the inner filter cartridge and enters its interior before exiting through the drainage holes on the corresponding first end caps. This method effectively doubles the filtration area within a fixed size, further adapting to the filtration of high-flow-rate nuclear power plant water and improving filtration efficiency. Attached Figure Description

[0020] Figure 1 A cross-sectional structural schematic diagram of a filter element for high-flow nuclear power plant water treatment provided in an embodiment of this utility model;

[0021] Figure 2 A schematic diagram of the AA-direction cross-sectional structure of a filter element for high-flow nuclear power plant water treatment provided in an embodiment of this utility model;

[0022] Figure 3 A schematic diagram of the BB-direction cross-sectional structure of a filter element for high-flow nuclear power plant water treatment provided in an embodiment of this utility model;

[0023] Figure 4 for Figure 1 A left view of a filter cartridge for high-flow-rate nuclear power plant water treatment provided in the embodiment;

[0024] Figure 5 for Figure 1 Right view of a filter cartridge for high-flow nuclear power plant water treatment provided in the embodiment;

[0025] Explanation of reference numerals in the attached figures:

[0026] 10. First end cap; 11. Water outlet hole; 20. Second end cap; 21. Water inlet hole; 30. Outer filter cylinder; 31. First cylindrical section; 32. Conical section; 40. Inner filter cylinder; 41. Second cylindrical section; 50. Auxiliary support ring; 51. Water passage hole; 60. Central column; 70. Annular water inlet cavity. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, 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 merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] Please refer to the following: Figure 1 , Figure 4 and Figure 5 The present invention describes a filter element for high-flow-rate nuclear power plant water treatment. The filter element comprises a first end cap 10, an outer filter cylinder 30, an inner filter cylinder 40, and a second end cap 20. Two first end caps 10 are provided, arranged parallel and spaced apart, each with a water inlet hole 11. The outer filter cylinder 30 is connected to both ends of the two first end caps 10, and has a cavity. The inner filter cylinder 40 is located within the cavity and is coaxially arranged with the outer filter cylinder 30. One end of the inner filter cylinder 40 is connected to one of the first end caps 10. The other end of the inner filter cylinder 40 is provided with a second end cap 20. An annular water inlet cavity 70 is formed between the inner filter cylinder 40 and the outer filter cylinder 30.

[0029] Specifically, two first end caps 10 can be set as end cap one and end cap two, respectively. The two ends of the outer filter cylinder 30 are connected to end cap one and end cap two, respectively. One end of the inner filter cylinder 40 is connected to end cap one, and the inner filter cylinder 40 is connected to the water outlet hole 11 on end cap one. The other end of the inner filter cylinder 40 is connected to the second end cap 20. Water entering the annular water inlet chamber 70 through the water outlet hole 11 on end cap two is filtered through the outer filter cylinder 30 and the inner filter cylinder 40, respectively. Water entering the inner filter cylinder 40 is discharged after passing through the water outlet hole 11 on end cap one.

[0030] The filter cartridge for high-flow-rate nuclear power plant water treatment provided in this embodiment, compared with the prior art, provides support for the outer filter cartridge 30 and the inner filter cartridge 40 through the two first end caps 10, ensuring the stability of the combined outer filter cartridge 30 and inner filter cartridge 40. The annular inlet cavity 70 formed between the outer filter cartridge 30 and the inner filter cartridge 40 can communicate with the filter's inlet channel through the water outlet hole 11 on the corresponding end cap. Water in the annular inlet cavity 70 can be filtered simultaneously through the outer filter cartridge 30 and the inner filter cartridge 40, allowing some water to be directly discharged after the outer filter cartridge 30, while another portion passes through the inner filter cartridge 40 and enters its interior, subsequently being discharged through the water outlet hole 11 on the corresponding first end cap 10. This method effectively increases the filtration area by nearly double on a fixed-size basis, further adapting to the filtration of high-flow-rate nuclear power plant water and also further improving filtration efficiency.

[0031] In some embodiments, see Figure 1 The filter cartridge for high-flow nuclear power plant water treatment also includes a central column 60, which is coaxially arranged with the outer filter cartridge 30 or the inner filter cartridge 40, and can be fixedly connected to each first end cover 10 and the second end cover 20.

[0032] The central column 60 serves as an intermediate support, supporting the first end caps 10 and the second end caps 20 to ensure overall stability. The central column 60 can be a hollow metal tube.

[0033] In some embodiments, the outer filter cartridge 30 may be as follows: Figure 1 The structure shown. See also Figure 1 The outer filter cylinder 30 includes a first cylindrical section 31 and a conical section 32. One end of the first cylindrical section 31 is connected to one of the first end caps 10. The conical section 32 has a large-diameter end and a small-diameter end. The large-diameter end of the conical section 32 corresponds to one end of the first cylindrical section 31, and the small-diameter end of the conical section 32 is connected to the other first end cap 10. The conical section 32 and the first cylindrical section 31 combine to form a cylindrical cavity.

[0034] The combination of the first cylindrical section 31 and the conical section 32 can relatively increase the volume of the annular water inlet chamber 70 to a certain extent, and can also relatively increase the filtration area of ​​the outer filter cylinder 30, thus adapting to the filtration of large flow rates of nuclear power plant water to a certain extent. Moreover, this structure is easy to manufacture, as the first end cap 10 and the second end cap 20 on the water inlet side are only connected to the outer filter cylinder 30, making assembly and disassembly relatively convenient.

[0035] In some embodiments, see Figure 1 The filter element for high-flow nuclear power plant water treatment also includes an auxiliary support ring 50, which is fixed on the central column 60 and located between the first cylindrical section 31 and the conical section 32, and is used to fix the first cylindrical section 31 and the conical section 32 together.

[0036] The auxiliary support ring 50 is used to connect the corresponding ends of the first cylindrical section 31 and the conical section 32. The auxiliary support ring 50 can further increase the stability of the outer filter cylinder 30 and the inner filter cylinder 40, enhance the structural strength, and also ensure the transition from the first cylindrical section 31 to the conical section 32.

[0037] Correspondingly, the first cylindrical segment 31 and the conical segment 32 can both be welded to the auxiliary support ring 50.

[0038] In some embodiments, the inner filter cartridge 40 may be as follows: Figure 1 and Figure 2 The structure shown. See also Figure 1 and Figure 2 The inner filter cartridge 40 includes two second cylindrical sections 41, which are located on both sides of the auxiliary support ring 50 and are fixedly connected to the auxiliary support ring 50. One end of one of the second cylindrical sections 41, away from the auxiliary support ring 50, is connected to one of the first end caps 10. The other end of the second cylindrical section 41, away from the auxiliary support ring 50, is connected to the second end cap 20.

[0039] The two second cylindrical sections 41 can be adapted to the setting of the auxiliary support ring 50, thereby ensuring that the auxiliary support ring 50 can be fixedly connected to the central column 60. In addition, this structure can also ensure that the inner filter cylinder 40 is formed by two small-sized second cylindrical sections 41, which is convenient to manufacture and can also ensure the stability of the support.

[0040] In addition, this structure involves one end of one of the second cylindrical sections 41 being connected only to the second end cap 20, which makes it relatively easy to assemble and disassemble.

[0041] In some embodiments, the auxiliary support ring 50 may be adopted as follows: Figure 3 The structure shown. See also Figure 3 The auxiliary support ring 50 is provided with multiple water passage holes 51, each of which is located between the first cylindrical section 31 and the second cylindrical section 41.

[0042] The water passage 51 ensures that the annular area between the first cylindrical section 31 and the corresponding second cylindrical section 41, and the annular area between the conical section 32 and another second cylindrical section 41 are connected, thereby ensuring the formation of the annular water inlet cavity 70.

[0043] In some embodiments, the second end cap 20 may be adopted as follows: Figure 3 The structure shown. See also Figure 3 The second end cap 20 is provided with multiple water inlet holes 21, and a mesh sheet that can cover each water inlet hole 21 is provided on the second end cap 20.

[0044] Multiple water inlet holes 21 on the second end cover 20 can be arranged in a ring around the axis of the second end cover 20, and the mesh can be a composite mesh formed by combining at least two layers of wire mesh, which can be integrally sintered or welded onto the second end cover 20 to cover each water inlet hole 21. This structure can further increase the filtration area, thereby ensuring adaptability to large flow rates of nuclear power plant wastewater.

[0045] In some embodiments, both the outer filter cartridge 30 and the inner filter cartridge 40 are formed by sintering a perforated plate with at least two layers of wire mesh and then rolling it up.

[0046] Specifically, both the outer filter cartridge 30 and the inner filter cartridge 40 are formed by rolling. The raw materials before rolling are integrally sintered with at least two layers of wire mesh through a perforated plate. This structure can effectively ensure the structural strength of each wire mesh, thereby ensuring service life and the filtration effect on nuclear power plant water.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A filter cartridge for use in water treatment in a large flow nuclear power plant, characterized in that include: The first end cap is provided in two, and the two first end caps are arranged in parallel and spaced apart. Each first end cap is provided with a water outlet. An outer filter cartridge is connected to two of the first end caps at both ends, and the outer filter cartridge has a cavity. An inner filter cylinder is located in the cylinder cavity and is coaxially arranged with the outer filter cylinder; one end of the inner filter cylinder is connected to one of the first end caps; the other end of the inner filter cylinder is provided with a second end cap; an annular water inlet cavity is formed between the inner filter cylinder and the outer filter cylinder; Water entering the annular inlet chamber through a water outlet on another of the first end caps is filtered by the outer filter cylinder and the inner filter cylinder, respectively.

2. The filter element for water treatment in a large-flow nuclear power plant according to claim 1, wherein The filter element for high-flow nuclear power plant water treatment also includes a central column, which is coaxially arranged with the outer filter cylinder or the inner filter cylinder for fixed connection of each of the first end caps and the second end caps.

3. The filter element for high-flow nuclear power plant water treatment as described in claim 2, characterized in that, The outer filter cartridge includes: The first cylindrical segment is connected at one end to one of the first end caps; The conical segment has a large-diameter end and a small-diameter end. The large-diameter end of the conical segment corresponds to one end of the first cylindrical segment, and the small-diameter end of the conical segment is connected to another first end cap. The conical segment and the first cylindrical segment are combined to form the cylindrical cavity.

4. The filter element for high-flow nuclear power plant water treatment as described in claim 3, characterized in that, The filter element for high-flow nuclear power plant water treatment also includes an auxiliary support ring, which is fixed on the central column and located between the first cylindrical section and the conical section, and is used to fix the first cylindrical section and the conical section together.

5. The filter element for high-flow nuclear power plant water treatment as described in claim 4, characterized in that, The inner filter cylinder includes two second cylindrical sections, which are located on both sides of the auxiliary support ring and are fixedly connected to the auxiliary support ring; one end of one of the second cylindrical sections away from the auxiliary support ring is connected to one of the first end caps; the other end of the second cylindrical section away from the auxiliary support ring is connected to the second end cap.

6. The filter element for high-flow nuclear power plant water treatment as described in claim 5, characterized in that, The auxiliary support ring is provided with multiple water passage holes, each of which is located between the first cylindrical section and the second cylindrical section.

7. The filter element for high-flow nuclear power plant water treatment as described in any one of claims 1-6, characterized in that, The second end cap is provided with a plurality of water inlet holes, and a mesh sheet is provided on the second end cap to cover each of the water inlet holes.

8. The filter element for high-flow nuclear power plant water treatment as described in any one of claims 1-6, characterized in that, Both the outer filter cylinder and the inner filter cylinder are formed by sintering a perforated plate with at least two layers of wire mesh and then rolling it up.

Images