Filtering device for spent fuel post-treatment and disassembly and assembly method

Abstract

The invention provides a filtering device for spent fuel post-treatment and a dismounting and mounting method. The filtering device comprises a cylindrical filter, the filter cup is arranged in the cylindrical filter; the sealing assembly is arranged between the cylindrical filter and the filter cup; the seal assembly includes: an annular body; the first boss is arranged on the first side of the annular body; the second boss is arranged on the second side of the annular body; the diameter of the first boss is smaller than that of the annular body, a convex face is formed between the annular body and the first boss, and the annular body, the first boss, the second boss and the convex face are integrally formed. The diameter of the second boss is smaller than that of the first boss. The sealing assembly of the filtering device is long in service life, an operator can conveniently disassemble and assemble the sealing assembly at a long distance through an auxiliary tool when the sealing assembly is damaged, the frequency that the operator enters a radiation area for operation is reduced, and the exposure dose level of the operator is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of spent fuel post-processing, in particular to a spent fuel post-processing filtering device and a disassembly method. Background Art

[0002] In the spent fuel reprocessing, decontamination, separation, and plutonium purification facility, the existing seal components are primarily made of perfluoroelastomer (PFEM). This material hardens under high-radiation and acidic operating conditions, causing it to break off due to friction with the filter cup. This results in a very short service life, making it unsuitable for engineering applications. Furthermore, it cannot be replaced remotely, requiring personnel to perform replacements in close proximity, increasing worker radiation exposure. The seal between the cartridge filter and the filter cup is crucial, and leakage is not permitted during operation. Leakage of high-discharge liquid would significantly increase the dose level within the hot chamber, exposing personnel to unnecessary radiation exposure during equipment maintenance. Furthermore, leaks would reduce visibility through the viewing window, hindering operators' ability to observe the operating conditions of the equipment within the chamber and preventing timely assessments. Summary of the Invention

[0003] The present invention provides a filter device for fuel post-processing and a disassembly and assembly method, so as to solve the problems that the sealing component of the filter device has a short service life and is inconvenient to replace the sealing component over a long distance when the sealing component is damaged.

[0004] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0005] A filtering device for spent fuel post-processing, comprising:

[0006] Cartridge filters;

[0007] a filter cup disposed inside the cartridge filter;

[0008] a sealing assembly provided between the cartridge filter and the filter cup;

[0009] The sealing assembly includes: an annular body;

[0010] a first boss disposed on a first side of the annular body;

[0011] a second boss disposed on a second side of the annular body;

[0012] The diameter of the first boss is smaller than the diameter of the annular body, a convex surface is formed between the annular body and the first boss, and the annular body, the first boss, the second boss, and the convex surface are integrally formed;

[0013] A diameter of the second boss is smaller than a diameter of the first boss.

[0014] Optionally, the first boss is in close contact with the cartridge filter.

[0015] Optionally, the second boss is in close contact with the filter cup.

[0016] Optionally, the cartridge filter comprises:

[0017] Upper cover;

[0018] A cylinder body fixedly connected to the upper cover, the filter cup being fixed inside the cylinder body, and the upper cover and the filter cup being sealed by a sealing assembly;

[0019] A support fixedly connected to the cylinder.

[0020] Optionally, the filter cup includes:

[0021] A cup body with a cylindrical structure;

[0022] A supporting frame is arranged on the outer surface of the cup body.

[0023] Optionally, an inclined slope is provided at the edge of the second boss.

[0024] Optionally, the slope of the inclined slope is 5° to 15°.

[0025] Optionally, a guide groove is provided on the surface of the first boss.

[0026] Optionally, the sealing component is made of polyethylene.

[0027] The present invention also provides a method for disassembling and assembling a filtering device for spent fuel post-processing, comprising:

[0028] The auxiliary tooling clamps the upper surface of the first boss, and the sealing assembly is removed from the cartridge filter by lowering the auxiliary tooling;

[0029] The auxiliary tooling clamps the second boss, and the auxiliary tooling rises so that the sealing assembly is installed and fixed to the cartridge filter.

[0030] The above solution of the present invention includes at least the following beneficial effects:

[0031] The above-mentioned solution of the present invention is provided with a cartridge filter; a filter cup disposed inside the cartridge filter; a sealing assembly disposed between the cartridge filter and the filter cup; the sealing assembly includes: an annular body; a first boss disposed on a first side of the annular body; a second boss disposed on a second side of the annular body; the diameter of the first boss is smaller than the diameter of the annular body, a convex surface is formed between the annular body and the first boss, the annular body, the first boss, the second boss, and the convex surface are integrally formed; the diameter of the second boss is smaller than the diameter of the first boss. The sealing assembly of the filter device of the present invention has a long service life, and when damaged, the operator can conveniently disassemble and assemble it remotely using auxiliary tools, thereby reducing the frequency of personnel entering the radiation area for operation and reducing the level of exposure to personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of a filtering device provided by an embodiment of the present invention;

[0033] Figure 2 1 is a schematic structural diagram of a cartridge filter provided by an embodiment of the present invention;

[0034] Figure 3 is a schematic structural diagram of a filter cup provided by an embodiment of the present invention;

[0035] Figure 4 is a cross-sectional view of a sealing assembly provided by an embodiment of the present invention;

[0036] Figure 5 is a top view of a sealing assembly provided by an embodiment of the present invention;

[0037] Figure 6 The sealing assembly provided by the embodiment of the present invention is a three-dimensional Figure 1 ;

[0038] Figure 7 The sealing assembly provided by the embodiment of the present invention is a three-dimensional Figure 2 .

[0039] Description of reference numerals:

[0040] 1. Annular body; 2. Sealing assembly; 3. First boss; 4. Second boss; 5. Convex surface; 6. Cartridge filter; 61. Upper cover; 62. Cylinder; 63. Support; 7. Filter cup; 71. Cup body; 72. Support frame. DETAILED DESCRIPTION

[0041] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0042] like Figures 1 to 7 As shown, an embodiment of the present invention provides a filtering device for spent fuel post-processing, comprising:

[0043] Cartridge filter 6;

[0044] A filter cup 7 is provided inside the cartridge filter 6;

[0045] A sealing assembly 2 provided between the cartridge filter 6 and the filter cup 7;

[0046] The sealing assembly 2 includes: an annular body 1;

[0047] A first boss 3 provided on a first side of the annular body 1;

[0048] A second boss 4 provided on a second side of the annular body 1;

[0049] The diameter of the first boss 3 is smaller than that of the annular body 1 . A convex surface 5 is formed between the annular body 1 and the first boss 3 . The annular body 1 , the first boss 3 , the second boss 4 , and the convex surface 5 are integrally formed.

[0050] The diameter of the second boss 4 is smaller than the diameter of the first boss 3 .

[0051] In this embodiment, the filtering device for spent fuel reprocessing includes a cartridge filter 6 and a filter cup 7. During operation, the cartridge filter 6 and the filter cup 7 are assembled and used, and the sealing assembly 2 is used as a sealing structure between the contact surfaces of the cartridge filter and the filter cup.

[0052] like Figures 3 to 7As shown, the sealing assembly 2 includes an annular body 1, a first boss 3 and a second boss 4 respectively arranged on both sides of the annular body 1, a convex surface 5 is formed between the annular body 1 and the first boss 3, and the annular body 1, the first boss 3, the second boss 4, and the convex surface 5 are integrally formed. The diameter of the second boss 4 is smaller than the diameter of the first boss 3, and the diameter of the annular body 1 is larger than the diameters of the first boss 3 and the second boss 4. The end face of the first boss 3 fits tightly with the cartridge filter 6, and the end face seal is achieved by the force of mechanical extrusion; the end face of the second boss 4 fits tightly with the filter cup 7, and the end face seal is achieved by the force of mechanical extrusion. The convex surface 5 is in close contact with the inner wall of the cup mouth of the filter cup 7 to form a vertical seal. The double sealing of the end face seal and the vertical seal ensures the sealing performance.

[0053] Both sides of the sealing component 2 are designed with boss structures, which makes the disassembly and installation processes convenient for remote operation. When damaged, it is easy to use an electric follow-up manipulator with special replacement tooling for rapid disassembly, without the need for close contact between personnel, thus avoiding unnecessary exposure of personnel to doses.

[0054] The sealing assembly 2 of this embodiment has a long service life. When damaged, the operator can use auxiliary tools to disassemble and assemble it remotely, which reduces the frequency of personnel entering the radiation area for operation and reduces the exposure dose level of personnel.

[0055] like Figure 2 As shown, in an optional embodiment of the present invention, the cartridge filter 6 includes:

[0056] Upper cover 61;

[0057] A cylinder 62 fixedly connected to the upper cover 61, the filter cup 7 is fixed inside the cylinder 62, and the upper cover 61 and the filter cup 7 are sealed by a sealing assembly 2;

[0058] A support 63 is fixedly connected to the cylinder 62 .

[0059] In this embodiment, the body 62 is the main structure of the cartridge filter 6, typically made of carbon steel, low-alloy steel, or stainless steel. It houses other components and provides a filter space. The upper cover 61 seals the top of the body 62, typically connected via a flange, facilitating removal and replacement of the filter element while ensuring a tight seal. The support 63 supports and secures the filter, facilitating installation and maintenance.

[0060] like Figure 3 As shown, in an optional embodiment of the present invention, the filter cup 7 includes:

[0061] A cup body 71 of cylindrical structure;

[0062] A support frame 72 is provided on the outer surface of the cup body 71 .

[0063] In this embodiment, the cup body 71 is the main structure of the filter cup 7. A support frame 72 is provided on the outer surface of the cylindrical cup body 71 to provide mechanical strength and prevent the cup body 71 from being deformed or damaged under pressure.

[0064] In an optional embodiment of the present invention, an inclined slope is provided at the edge of the second boss 4 .

[0065] In an optional embodiment of the present invention, the slope of the inclined slope is 5° to 15°.

[0066] In the above embodiment, the contact surface between the second boss 4 and the filter cup 7 is provided with a vertical surface with a small slope, and the slope can be set to 5° to 15°, forming an interference fit with the inner wall of the cup mouth of the filter cup 7, and is used to fit tightly with the inner wall of the cup mouth of the filter cup 7 to achieve vertical sealing.

[0067] In an optional embodiment of the present invention, a guide groove is provided on the surface of the first boss 3 .

[0068] In this embodiment, the surface of the first boss 3 is provided with a guide groove, which cooperates with the contact surface of the cartridge filter 6 and is used for accurate positioning of the filter cup 7 during the lifting process.

[0069] In an optional embodiment of the present invention, the sealing component is made of polyethylene.

[0070] In this embodiment, the sealing component is made of polyethylene. The rigidity and plasticity of polyethylene enable it to achieve both end-face sealing (mechanical extrusion) and vertical sealing (slope fitting). Polyethylene has a strong molecular structure stability in high-radiation environments and is not prone to hardening or embrittlement. Polyethylene has excellent chemical inertness to strong acids (such as nitric acid in spent fuel reprocessing), and is not prone to swelling or corrosion, thus avoiding local degradation that could cause the seal to fail. Polyethylene deforms minimally under long-term mechanical extrusion, maintaining the stability of the sealing interface. It also has a high surface hardness, resulting in less friction debris when in contact with filter cups, etc., reducing the risk of leakage due to wear.

[0071] The present invention also provides a method for disassembling and assembling a filtering device for spent fuel post-processing, comprising:

[0072] Step 1: The auxiliary tooling clamps the upper end surface of the first boss 3 and lowers the auxiliary tooling to remove the sealing assembly 2 from the cartridge filter 6;

[0073] Step 2: The auxiliary tooling clamps the second boss 4 , and the auxiliary tooling rises to securely install the sealing assembly 2 and the cartridge filter 6 .

[0074] In this embodiment, the sealing assembly 2 of the filter device is replaced by an auxiliary tool and an electric follower manipulator. In the event of damage to the sealing assembly 2, the sealing assembly 2 can be removed by clamping the upper end surface of the first boss 3 with the auxiliary tool and lowering it.

[0075] During installation, the second boss 4 of the sealing assembly 2 is placed in the corresponding position of the auxiliary tooling, and the sealing assembly 2 is lifted to the sealing position by the auxiliary tooling, and the sealing assembly 2 can be installed in place.

[0076] When sealing assembly 2 is operating, both the end and vertical surfaces of the sealing assembly 2 are sealed simultaneously. The polyethylene material ensures effective sealing while extending the service life of the sealing assembly 2. As the filter cup 7 is raised to the sealing position via the lifting platform, it is guided by the boss. Once in position, the inner wall of the cup opening engages with the second boss 4 of the sealing assembly 2 to complete the vertical seal. The upper end of the filter cup 7 contacts the lower end of the convex surface 5 of the sealing assembly 2, completing the end seal.

[0077] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A filtering device for spent fuel post-processing, characterized in that: include: Cartridge filter (6); a filter cup (7) disposed inside the cartridge filter (6); a sealing assembly (2) disposed between the cartridge filter (6) and the filter cup (7); The sealing assembly (2) comprises: an annular body (1); a first boss (3) provided on a first side of the annular body (1); a second boss (4) provided on a second side of the annular body (1); The diameter of the first boss (3) is smaller than the diameter of the annular body (1); a convex surface (5) is formed between the annular body (1) and the first boss (3); the annular body (1), the first boss (3), the second boss (4), and the convex surface (5) are integrally formed; The diameter of the second boss (4) is smaller than the diameter of the first boss (3).

2. The filtering device for spent fuel reprocessing according to claim 1, characterized in that: The first boss (3) is in close contact with the cartridge filter (6).

3. The filtering device for spent fuel post-processing according to claim 1, characterized in that: The second boss (4) is in close contact with the filter cup (7).

4. The filtering device for spent fuel reprocessing according to claim 1, characterized in that: The cartridge filter (6) comprises: Upper cover (61); a barrel (62) fixedly connected to the upper cover (61), the filter cup (7) being fixed inside the barrel (62), and the upper cover (61) and the filter cup (7) being sealed via a sealing assembly (2); A support (63) is fixedly connected to the cylinder (62).

5. The filtering device for spent fuel post-processing according to claim 1, characterized in that: The filter cup (7) comprises: A cup body (71) of cylindrical structure; A supporting frame (72) is provided on the outer surface of the cup body (71).

6. The filtering device for spent fuel post-processing according to claim 1, characterized in that: An inclined slope is provided at the edge of the second boss (4).

7. The filtering device for spent fuel post-processing according to claim 6, characterized in that: The slope of the inclined slope is 5° to 15°.

8. The filtering device for spent fuel reprocessing according to claim 1, characterized in that: A guide groove is provided on the surface of the first boss (3).

9. The filtering device for spent fuel reprocessing according to claim 1, characterized in that: The sealing component is made of polyethylene.

10. A method for disassembling and assembling a filter device for spent fuel post-processing, characterized in that: include: The auxiliary tooling clamps the upper end surface of the first boss (3), and the sealing assembly is removed from the cartridge filter (6) by lowering the auxiliary tooling; The auxiliary tooling clamps the second boss (4), and the auxiliary tooling is raised so that the sealing assembly and the cartridge filter (6) are installed and fixed.

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