Assembly tool and assembly method for degassing device of degassing membrane of nuclear reactor

Abstract

The invention belongs to the technical field of degassing membrane degassing devices of nuclear power plants, and discloses an assembly tool and an assembly method for a degassing membrane degassing device of a nuclear reactor. The assembly tool comprises a first tool body, a second tool body and a fastening assembly. Wherein the height of the portion, stretching into the end face of the outer shell, of the first pressing part is larger than the height of the portion, stretching into the end face of the outer shell, of the second pressing part, and the height of the second pressing part meets the requirement that when a final pressing position is reached, the second pressing part is pressed; the length of the part, extending into the outer shell, of the second pressing part is consistent with the length of the part, extending into the outer shell, of the gland assembly of the outer shell. The first tool and the second tool which are matched with each other achieve staged assembly of controllable pre-pressing, ejection ring mounting, symmetrical final pressing and precise centering on sealing assemblies at the two ends of the hollow fiber membrane column in the outer shell, and the good sealing effect is achieved.

Description

Technical Field

[0001] This invention belongs to the technical field of degassing membrane degassing devices for nuclear power plants, and specifically relates to an assembly tooling and assembly method for a nuclear reactor degassing membrane degassing device. Background Technology

[0002] Hollow fiber membranes are the type of membrane module used in degassing membrane systems in nuclear power plants. Their membrane columns typically use epoxy resin as the fixing and covering material, and are reinforced and protected with austenitic stainless steel. Unlike the end-face compression sealing of conventional metal components, it is difficult to achieve an effective seal between epoxy resin and austenitic stainless steel through direct end-face compression. To ensure a complete seal between the membrane column and the outer shell, symmetrical assembly with rubber O-rings at both ends is usually required.

[0003] However, during membrane column assembly, due to the brittle nature of epoxy resin and the relatively fixed internal space of the austenitic stainless steel shell, the O-ring needs to be moderately compressed during installation to achieve a reliable seal. The O-ring and assembly gap are often designed at the upper limit of the compression ratio to ensure an absolute sealing effect. However, under this design, the O-ring needs to withstand a large preload force. During manual assembly, it is not only difficult to apply the compression force evenly, but it is also very easy to cause O-ring twisting, positioning deviation, or damage to the epoxy resin end face, making the assembly process extremely difficult. If only manual operation is used, it is difficult to guarantee the fitting accuracy and uniformity of the compression force between the hollow fiber membrane column, the O-ring, and the austenitic stainless steel shell, often resulting in low assembly efficiency and sealing performance that cannot fully meet the design requirements.

[0004] Therefore, relying solely on manual operation makes it difficult to guarantee the fitting accuracy and uniformity of clamping force between the hollow fiber membrane column, the O-ring, and the austenitic stainless steel shell. This not only results in low assembly efficiency but also makes it difficult to fully meet the sealing performance requirements. Designing an assembly fixture and employing an appropriate assembly method to provide controllable and symmetrical clamping force to the hollow fiber membrane column during assembly, while ensuring precise positioning and non-destructive fit of the O-ring under high compression conditions, has become a pressing technical problem to be solved in this field. Summary of the Invention

[0005] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide an assembly tooling for a nuclear reactor degassing membrane degassing device.

[0006] Another objective of this invention is to provide an assembly method using the above-described assembly tooling.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An assembly fixture for a nuclear reactor degassing membrane degassing device includes a first fixture, a second fixture, and fastening components.

[0009] The first tooling includes a first body and a first clamping part. The first clamping part is protruding and disposed on one side of the first body. When the first body is detachably installed on the end face of the outer shell by the fastening assembly, the first clamping part extends into the outer shell to press against the sealing ring sleeved on the end of the hollow fiber membrane column.

[0010] The second tooling includes a second main body and a second clamping part. The second clamping part protrudes from one side of the second main body and extends into the housing body when the second main body is detachably installed on the end face of the housing body by the fastening assembly to press against the sealing ring sleeved on the end of the hollow fiber membrane column.

[0011] The height of the first pressing part extending into the end face of the outer shell is greater than the height of the second pressing part extending into the end face of the outer shell, and the height of the second pressing part satisfies the following condition: when the final pressing position is reached, the length of the second pressing part extending into the outer shell is the same as the length of the cover assembly extending into the outer shell.

[0012] Furthermore, the first pressing part and the second pressing part are annular structures; the inner diameter of the first pressing part is larger than the outer diameter of the end of the hollow fiber membrane column, and the outer diameter of the first pressing part is smaller than the inner diameter of the end of the outer shell; the inner diameter of the second pressing part is larger than the outer diameter of the end of the hollow fiber membrane column, and the outer diameter of the second pressing part is smaller than the inner diameter of the end of the outer shell.

[0013] Furthermore, the first main body and the second main body are flat plate structures, which respectively cooperate with the ends of the outer shell to limit the movement during the pressing process of the first pressing part and the second pressing part.

[0014] Furthermore, a first limiting portion is formed by extending inward from the inner wall of the first pressing portion; a second limiting portion is formed by extending inward from the inner wall of the second pressing portion; the first limiting portion and the second limiting portion limit the axial position of the hollow fiber membrane column.

[0015] Furthermore, the first tooling includes a first gripping part, which protrudes from the first body on the opposite side from the first pressing part.

[0016] Furthermore, the second tooling includes a second gripping part, which protrudes from the second body on the opposite side of the second clamping part.

[0017] Furthermore, the number of the fastening components is even and they are arranged symmetrically to balance the force on the sealing ring during the clamping process.

[0018] An assembly method using the above-mentioned assembly fixture includes the following steps:

[0019] S1. The hollow fiber membrane column and the outer shell include a first end and a second end facing away from each other. A first sealing ring is installed at the first end of the hollow fiber membrane column, and the second end of the hollow fiber membrane column is placed in the outer shell.

[0020] S2. The first clamping part of the first tooling is attached to the first sealing ring, and the first tooling is installed on the end face of the first end of the outer shell by fastening assembly, so as to press the first sealing ring on the end of the first end of the hollow fiber membrane column, and push the end of the second end of the hollow fiber membrane column out of the outer shell, remove the first tooling, and install the second tooling on the end face of the first end of the outer shell.

[0021] S3. Insert a second sealing ring into the end of the second end of the hollow fiber membrane column, fit the second clamping part of the second tooling with the second sealing ring, and install the second tooling on the end face of the second end of the outer shell through the fastening assembly to press the second sealing ring into the end of the second end of the hollow fiber membrane column;

[0022] S4. Remove the second tooling installed at both ends of the outer shell and install the cover assembly of the outer shell.

[0023] Furthermore, the first sealing ring and the second sealing ring are rubber sealing rings, including one of O-rings and U-rings.

[0024] Furthermore, the outer shell is either a metal outer shell or an alloy outer shell.

[0025] Further, in step S2, the first clamping part of the first tooling is attached to the first sealing ring, the fastening assembly is tightened symmetrically, the first body of the first tooling is pushed toward the end face of the first end of the outer shell until the first body abuts against the end face of the first end of the outer shell and reaches the limit, the end of the second end of the hollow fiber membrane column is pushed out of the outer shell, the first tooling is removed, and the second tooling is installed on the end face of the first end of the outer shell.

[0026] Further, in step S3, the second sealing ring is inserted into the end of the second end of the hollow fiber membrane column, the second clamping part of the second tooling is fitted with the second sealing ring, the fastening assembly is tightened symmetrically, and the second body of the second tooling is pushed toward the end face of the second end of the outer shell until the second body abuts against the end face of the second end of the outer shell and reaches the limit.

[0027] Furthermore, when the second tooling at the second end of the outer shell is installed in step S3, the axial distance between the second limiting portions at both ends of the outer shell is substantially equal to the length of the hollow fiber membrane column.

[0028] The implementation of this invention has the following beneficial effects:

[0029] Improved sealing performance: Throughout the assembly process, the use of the first and second tooling strictly controls the deformation and position of the O-ring, avoiding eccentricity, misalignment, or excessive compression as in traditional manual operations, thereby ensuring a good sealing effect.

[0030] Reduced risk of damage: Using the first and second tooling together can effectively prevent the epoxy resin layer and hollow fiber membrane column from being damaged under excessive external force, reducing the defect rate and safety hazards during the installation process.

[0031] Reusable: The tooling has a simple structure and can be adjusted or customized according to different specifications of hollow fiber membrane columns and outer shell dimensions, making it highly versatile and economical. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the assembly tooling installation for some embodiments of the present invention. Figure 1 .

[0033] Figure 2 This is a schematic diagram of the assembly tooling installation for some embodiments of the present invention. Figure 2 .

[0034] Figure 3 This is a schematic diagram of the structure of the first tooling in some embodiments of the present invention. Figure 1 .

[0035] Figure 4 This is a schematic diagram of the structure of the first tooling in some embodiments of the present invention. Figure 2 .

[0036] Figure 5 This is a schematic diagram of the structure of the second tooling in some embodiments of the present invention. Figure 1 .

[0037] Figure 6 This is a schematic diagram of the structure of the second tooling in some embodiments of the present invention. Figure 2 .

[0038] Among them, 100-assembly tooling; 200-hollow fiber membrane column; 300-outer shell; 400-sealing ring;

[0039] 101-First tooling; 1011-First main body; 1012-First clamping part; 1013-First gripping part; 1014-First limiting part;

[0040] 102-Second tooling; 1021-Second main body; 1022-Second clamping part; 1023-Second gripping part; 1024-Second limiting part;

[0041] 103-Fastening components; 201-Membrane column body; 202-Membrane column epoxy resin. Detailed Implementation

[0042] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the invention will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing the present invention and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on the present invention.

[0043] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are used only for the convenience of describing the present invention and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0044] In this invention, the nuclear reactor degassing membrane degassing device includes a hollow fiber membrane column 200, an outer shell 300, a sealing ring 400, and a pressure cap assembly for the outer shell 300; the hollow fiber membrane column 200 in the following embodiment includes a membrane column body 201 and membrane column epoxy resin 202 extending from both ends of the membrane column body; the sealing ring 400, placed between the hollow fiber membrane column 200 and the outer shell 300, is specifically placed between the membrane column epoxy resin 202 of the hollow fiber membrane column 200 and the outer shell 300.

[0045] like Figures 1 to 6As shown, this embodiment provides an assembly fixture for a nuclear reactor degassing membrane degassing device, including a first fixture 101, a second fixture 102, and a fastening assembly 103. The first fixture 101 includes a first body 1011 and a first clamping part 1012. The first clamping part 1012 protrudes from one side of the first body 1011, and when the first body 1011 is detachably installed on the end face of the outer shell 300 via the fastening assembly 103, the first clamping part 1012 extends into the outer shell 300 to press against the sealing ring 400 sleeved on the end of the hollow fiber membrane column 200. The second fixture 102 includes a second body 1021 and a second clamping part 1022. The clamping part 1022 protrudes from one side of the second body 1021, and when the second body 1021 is detachably installed on the end face of the outer shell 300 by the fastening assembly 103, the second clamping part 1022 extends into the outer shell 300 to press against the sealing ring 400 sleeved on the end of the hollow fiber membrane column 200; the height of the first clamping part 1012 extending into the end face of the outer shell 300 is greater than the height of the second clamping part 1022 extending into the end face of the outer shell 300, and the height of the second clamping part 1022 satisfies the following: when the final clamping position is reached, the length of the second clamping part 1022 extending into the outer shell 300 is the same as the length of the cover assembly of the outer shell 300 extending into the outer shell 300.

[0046] Specifically, the first tooling 101 and the second tooling 102, working in concert, perform a phased assembly within the outer casing 300 of the hollow fiber membrane column 200, including controllable pre-compression, ejection of the sealing rings, symmetrical final compression, and precise centering, achieving a good sealing effect. Furthermore, in the working state, one first tooling 101 and two second tooling 102 are used. In the working state, the second tooling 102, which replaces the first tooling 101, serves to stabilize the hollow fiber membrane column 200 and limit its movement. The other end of the second tooling 102 is used for secondary compression (final compression) after the second sealing ring 400 is inserted, ensuring that the sealing rings 400 at both ends reach the target compression ratio and maintain uniform force and full contact with the sealing surface even during maximum compression.

[0047] In some embodiments, the first pressing part 1012 and the second pressing part 1022 are annular structures; the inner diameter of the first pressing part 1012 is larger than the outer diameter of the end of the hollow fiber membrane column 200, and the outer diameter of the first pressing part 1012 is smaller than the inner diameter of the end of the outer shell 300; the inner diameter of the second pressing part 1022 is larger than the outer diameter of the end of the hollow fiber membrane column 200, and the outer diameter of the second pressing part 1022 is smaller than the inner diameter of the end of the outer shell 300. Specifically, the size and position of the gap formed between the first pressing part 1012 and the second pressing part 1022 and the hollow fiber membrane column 200 and the outer shell 300 are matched to satisfy that the first pressing part 1012 and the second pressing part 1022 are positioned between the hollow fiber membrane column 200 and the outer shell 300.

[0048] In some embodiments, the first body 1011 and the second body 1021 are flat plate structures, respectively cooperating with the ends of the outer shell 300 to limit movement during the clamping process of the first clamping part 1012 and the second clamping part 1022. Specifically, the first body 1011 and the second body 1021 are flat plates adapted to the size of the end face of the outer shell 300. During the clamping process, the first body 1011 and the second body 1021 gradually approach the end face of the outer shell 300 until the first body 1011 and the second body 1021 abut against the end face of the outer shell 300, reaching the limit. The first body 1011 and the second body 1021 have holes in the same number as the fastening assembly 103, so that the fastening assembly 103 can connect the assembly tool 100 and the outer shell 300.

[0049] In some embodiments, the inner wall of the first pressing part 1012 extends inward to form a first limiting part 1014; the inner wall of the second pressing part 1022 extends inward to form a second limiting part 1024; the first limiting part 1014 and the second limiting part 1024 limit the axial position of the hollow fiber membrane column 200. The first limiting part 1014 and the second limiting part 1024 are used to determine the axial position of the hollow fiber membrane column 200. When the sealing rings 400 at both ends are assembled, the second limiting parts 1024 at both ends are used to ensure that the hollow fiber membrane column 200 is axially centered.

[0050] In some embodiments, the fastening assembly 103 is a bolt, screw, or other component that can connect the first tooling 101 and the second tooling 102 to the end face of the housing 300. The number of fastening assemblies 103 is even, and they are symmetrically arranged to balance the force on the sealing ring 400 during the clamping process.

[0051] In some embodiments, the first tooling 101 further includes a first gripping portion 1013, which protrudes from the first body 1011 on the side opposite to the first pressing portion 1012. The second tooling 102 includes a second gripping portion 1023, which protrudes from the second body 1021 on the side opposite to the second pressing portion 1022. Specifically, the number of second gripping portions 1023 is greater than three, so that during the insertion of the second sealing ring 400, the second tooling 102, serving as a base, can stably place the entire device on the operating platform.

[0052] This embodiment provides an assembly method using the above-described assembly fixture, including the following steps:

[0053] S1. The hollow fiber membrane column and the outer shell include a first end and a second end facing away from each other. A first sealing ring is installed at the first end of the hollow fiber membrane column, and the second end of the hollow fiber membrane column is placed in the outer shell. Specifically, the hollow fiber membrane column is vertically inserted into the outer shell, and the first sealing ring is installed on the upper surface of the outer shell at this time.

[0054] S2. The first clamping part of the first tooling is attached to the first sealing ring. The first tooling is installed on the end face of the first end of the outer shell using the fastening assembly to press the first sealing ring against the end of the first end of the hollow fiber membrane column. The end of the second end of the hollow fiber membrane column is pushed out of the outer shell. The first tooling is then removed, and a second tooling is installed on the end face of the first end of the outer shell. Specifically, step S2 includes attaching the first clamping part of the first tooling to the first sealing ring, symmetrically tightening the fastening assembly, pushing the first body of the first tooling towards the end face of the first end of the outer shell until the first body abuts against the end face of the first end of the outer shell, reaching a limit. The end of the second end of the hollow fiber membrane column is pushed out of the outer shell. The first tooling is then removed, and a second tooling is installed on the end face of the first end of the outer shell. The entire assembly is then reversed so that the sealing ring can be installed on the second end of the hollow fiber membrane. Specifically, the clamping part of the first tooling is precisely matched according to the fitting clearance between the outer diameter of the hollow fiber membrane column and the outer shell.

[0055] S3. Insert a second sealing ring into the second end of the hollow fiber membrane column, fit the second clamping part of the second tooling against the second sealing ring, and install the second tooling onto the end face of the second end of the outer casing using a fastening assembly to press the second sealing ring against the end of the second end of the hollow fiber membrane column (e.g., Figure 1 and Figure 2 (The state shown).

[0056] Specifically, in step S3, a second sealing ring is inserted into the second end of the hollow fiber membrane column; the second clamping part of the second tooling is fitted against the second sealing ring; the fastening assembly is symmetrically tightened; and the second main body of the second tooling is pushed towards the end face of the second end of the outer shell until the second main body abuts against the end face of the second end of the outer shell, reaching the limit. When the installation of the second tooling at the second end of the outer shell is completed in step S3, the axial distance between the second limiting parts at both ends of the outer shell is substantially equal to the length of the hollow fiber membrane column.

[0057] Specifically, the height of the second clamping part in the second tooling is consistent with the pressure cap assembly of the outer shell: the height of the second clamping part of the second tooling is consistent with the design clamping reference height of the pressure cap assembly of the outer shell. The clamping endpoint is when the sealing ring reaches the target clamping amount, that is, the second clamping part of the second tooling is fully inserted between the hollow fiber membrane column and the outer shell; the second tooling is used as the final pressure reference component, and its clamping endpoint is completely consistent with the final assembly state of the product, so that the axis of the membrane column after final pressure is automatically centered with the reference axis of the shell within the drawing tolerance. Since the second clamping part is at the same elevation as the pressure cap of the outer shell, the hollow fiber membrane column is automatically centered to the position required by the drawing after final pressure; coaxiality, end face fit and sealing ring compression rate are simultaneously met.

[0058] S4. Remove the second tooling installed at both ends of the outer casing and install the cover assembly of the outer casing.

[0059] In the above steps, the first and second sealing rings are O-rings, and the outer shell is an austenitic stainless steel outer shell.

[0060] In some embodiments, the first sealing ring and the second sealing ring may also be other rubber sealing rings, such as U-rings; the outer shell may also be a metal outer shell or another alloy outer shell.

[0061] The assembly method of the present invention greatly simplifies the installation procedure, shortens the assembly time, and improves the assembly efficiency by segmenting and then simultaneously and symmetrically clamping the first tooling and the second tooling.

[0062] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. An assembly tool for a nuclear reactor venting membrane degassing apparatus, characterized by: The first tool, the second tool and the fastening assembly are included. The first tool includes a first main body and a first pressing part, the first pressing part is protruded on one side of the first main body, and when the first main body is detachably installed on the end face of the outer shell through the fastening assembly, the first pressing part extends into the outer shell to press the sealing ring sleeved on the end part of the hollow fiber membrane column. The second tool includes a second main body and a second pressing part, the second pressing part is protruded on one side of the second main body, and when the second main body is detachably installed on the end face of the outer shell through the fastening assembly, the second pressing part extends into the outer shell to press the sealing ring sleeved on the end part of the hollow fiber membrane column. The height of the first pressing part extending into the end face of the outer shell is greater than the height of the second pressing part extending into the end face of the outer shell, and the height of the second pressing part satisfies that when reaching the final position of pressing, the length of the second pressing part extending into the outer shell is consistent with the length of the gland assembly of the outer shell extending into the outer shell.

2. The assembly tooling for a nuclear reactor venting membrane degassing apparatus of claim 1, wherein: The first pressing part and the second pressing part are annular structures, the inner diameter of the first pressing part is greater than the outer diameter of the end part of the hollow fiber membrane column, and the outer diameter of the first pressing part is smaller than the inner diameter of the end part of the outer shell, the inner diameter of the second pressing part is greater than the outer diameter of the end part of the hollow fiber membrane column, and the outer diameter of the second pressing part is smaller than the inner diameter of the end part of the outer shell.

3. The assembly tooling for a nuclear reactor venting membrane degassing apparatus of claim 1, wherein: The first main body and the second main body are flat plate structures, respectively matched with the end part of the outer shell to limit during the pressing process of the first pressing part and the second pressing part.

4. The assembly tooling for a nuclear reactor venting membrane degassing apparatus of claim 1, wherein: The inner wall of the first pressing part extends inward to form a first limiting part, and the inner wall of the second pressing part extends inward to form a second limiting part, the first limiting part and the second limiting part limit the axial position of the hollow fiber membrane column.

5. The assembly tool for the degassing device of the nuclear reactor according to claim 1, characterized in that: The first tool includes a first gripping part, the first gripping part is protruded on the other side of the first main body opposite to the first pressing part; And / or, the second tool includes a second gripping part, the second gripping part is protruded on the other side of the second main body opposite to the second pressing part.

6. The assembly tooling for a nuclear reactor venting membrane degassing apparatus of claim 1, wherein: The number of the fastening assembly is even, and is symmetrically arranged to balance the stress of the sealing ring during the pressing process.

7. An assembling method using the assembling tool according to any one of claims 1 to 6, characterized by, The steps include: S1. The hollow fiber membrane column and the outer shell include opposite first and second ends, the first sealing ring is installed on the first end of the hollow fiber membrane column, and the hollow fiber membrane column is placed in the outer shell through the second end of the hollow fiber membrane column; S2. The first pressing part of the first tool is attached to the first sealing ring, the first tool is installed on the end face of the first end of the outer shell through the fastening assembly to press the first sealing ring on the end part of the first end of the hollow fiber membrane column, the end part of the second end of the hollow fiber membrane column is pressed out of the outer shell, the first tool is removed, and the second tool is installed on the end face of the first end of the outer shell. S3. A second sealing ring is installed at the end of the second end of the hollow fiber membrane column, a second pressing part of the second tool is attached to the second sealing ring, the second tool is installed on the end surface of the second end of the outer shell through the fastening assembly to press the second sealing ring at the end of the second end of the hollow fiber membrane column; S4. The second tool installed on the two ends of the outer shell is removed, and the gland assembly of the outer shell is installed.

8. The assembly method according to claim 7, wherein: the first sealing ring and the second sealing ring are rubber sealing rings, including one of O-ring and U-ring; and / or, the outer shell is one of metal outer shell and alloy outer shell.

9. The assembly method according to claim 7, wherein: in the step S2, a first pressing part of the first tool is attached to the first sealing ring, the fastening assembly is symmetrically tightened, the first body of the first tool is pushed to the end surface of the first end of the outer shell until the first body abuts against the end surface of the first end of the outer shell to reach the limit, the end of the second end of the hollow fiber membrane column is ejected from the outer shell, the first tool is removed, and the second tool is installed on the end surface of the first end of the outer shell; and / or, in the step S3, the second sealing ring is installed at the end of the second end of the hollow fiber membrane column, a second pressing part of the second tool is attached to the second sealing ring, the fastening assembly is symmetrically tightened, the second body of the second tool is pushed to the end surface of the second end of the outer shell until the second body abuts against the end surface of the second end of the outer shell to reach the limit.

10. The method of assembly of claim 7, wherein: When the installation of the second tool on the second end of the outer shell is completed in the step S3, the axial distance between the second limit parts at the two ends of the outer shell is substantially equal to the length of the hollow fiber membrane column.

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