A tube bundle installation device for a tube heat exchanger and its disassembly and assembly process

Abstract

The present invention belongs to the technical field of connecting devices, and in particular relates to a tube bundle installation device of a tubular heat exchanger and a disassembly and assembly process thereof, comprising a first flange, a second flange and a tube sheet, wherein the tube sheet is installed between the first flange and the second flange and is provided with a tube bundle, and also comprises a connecting structure, which comprises a plug-in assembly for temporary connection between the tube sheet and the first flange and a locking assembly for fastening connection between the first flange, the second flange and the tube sheet; by adopting a plug-in assembly for temporary connection of the connecting mechanism, after connecting the tube sheet to the first flange, it is connected to the second flange through the locking assembly, thereby avoiding the installation inconvenience caused by simultaneous assembly and improving convenience; the step-by-step connection can ensure the installation accuracy and prevent deviation; at the same time, temporary connection is performed by plugging, thereby further improving convenience.

Description

Technical Field

[0001] The invention belongs to the technical field of connecting devices, and in particular relates to a tube bundle installation device of a tube heat exchanger and a disassembly and assembly process thereof. Background Art

[0002] Tubular heat exchangers are usually equipped with U-shaped tube bundles. In order to facilitate the installation of the tube bundle and prevent the liquid in the kettle from entering the tube bundle, a tube sheet is usually set on one side of the tube bundle inlet and outlet. This means that the installation of the tube bundle involves the connection of three flanges (the side of the kettle and the side of the inlet and outlet pipe boxes are all equipped with flange ends), and each of the three flanges can only be installed with a single bolt and nut for matching connection and fixation. At the same time, two gaskets are set between the three flanges for simultaneous assembly. The weight of the tube bundle is usually heavy, and its center of gravity is not on the tube sheet. Therefore, it is very difficult to assemble the three flanges and two gaskets, and it is also very easy to deviate during installation, affecting the sealing performance and causing leakage. This needs to be improved. Summary of the invention

[0003] The purpose of the present invention is to provide a tube bundle installation device and disassembly process of a tube heat exchanger in view of the above-mentioned technical problems, so as to improve the convenience of assembling three flanges and two gaskets, and to easily control the installation accuracy and prevent the installation from being offset.

[0004] In view of this, the present invention provides a tube bundle installation device for a tube heat exchanger, comprising a kettle body and a tube box, and the tube bundle installation device comprises:

[0005] A first flange connected to the side of the kettle body;

[0006] A second flange is connected to the side of the pipe box;

[0007] A tube sheet is installed between the first flange and the second flange and is provided with a tube bundle extending toward one side of the kettle body;

[0008] The connecting mechanism comprises a pre-assembled component for temporary connection between the tube sheet and the first flange and a locking component for fastening connection between the first flange, the second flange and the tube sheet.

[0009] In the above technical solution, further:

[0010] There are multiple pre-installed components and locking components, and they are arranged at equal intervals around the circumference;

[0011] The number of pre-installed components is less than the number of locking components.

[0012] In the above technical solution, further, the pre-installed components include:

[0013] A connecting rod, one end of which is provided with a protrusion, and the other end of which passes through the tube sheet and the first flange and is provided with a pre-tightening member, and the pre-tightening member is detachably connected to the connecting rod;

[0014] The protrusion is located between the tube plate and the second flange.

[0015] In the above technical solution, further:

[0016] The connecting rod extends toward the second flange and passes through the second flange to form an extension portion;

[0017] Wherein, a fastener is detachably mounted on the extension portion.

[0018] In the above technical solution, further:

[0019] A groove matching the raised portion is provided on one side of the tube sheet close to the raised portion;

[0020] The protrusion is built into the groove, and the depth dimension of the groove along the axial direction is greater than the thickness dimension of the protrusion along the axial direction.

[0021] In the above technical solution, further:

[0022] The cross sections of the protrusion and the groove along the radial direction are both non-circular.

[0023] In the above technical solution, further, the pre-tightening member includes:

[0024] The shell is sleeved on one end of the connecting rod away from the protruding portion, and a plurality of annular grooves are formed on the surface of the connecting rod located inside the shell;

[0025] The buckle is installed in the housing and moves closer to or farther from the axis of the connecting rod on the radial surface and is matched with the annular buckle groove;

[0026] A driving structure, installed in the housing and used to cause the buckle to move back and forth;

[0027] An end cover is installed on the side of the housing and is used to restrict the driving structure and the buckle in the housing;

[0028] When the buckle cooperates with the annular groove, the movement of the connecting rod along its axial direction can be restricted.

[0029] In the above technical solution, further, the driving structure includes:

[0030] An elastic pad is installed on a side of the buckle away from the axis of the connecting rod;

[0031] A button, one end of which extends out of an end cover along the axial direction, and the other end of which abuts against the buckle surface;

[0032] The surface where the buckle abuts against the button is an inclined surface.

[0033] In the above technical solution, further, the driving structure also includes:

[0034] The spring is installed in the button, and two ends of the spring are respectively in contact with the inner wall of the button and the axial end surface of the connecting rod.

[0035] The present invention provides a disassembly and assembly process of a tube bundle installation device of a tubular heat exchanger, comprising the following steps:

[0036] S1: Align the tube sheet with the first flange, and then select a plurality of suitable positions at equal intervals around the circumference to pass the connecting rod through the tube sheet and the first flange, and allow the connecting rod to extend into the shell;

[0037] S2: After the connecting rod is inserted into the housing, it will push open the buckle, and after reaching the appropriate axial depth, the buckle moves axially under the action of the elastic pad to cooperate with the annular groove, and at the same time, the spring is compressed;

[0038] S3: Then align the second flange, and make the extension pass through the second flange and then fix it with a fastener;

[0039] S4: Then, multiple locking components are installed to achieve sequential connection and fixation of the first flange, the tube sheet, and the second flange;

[0040] S5: When maintenance is required, the multiple locking components are disassembled and the second flange is removed;

[0041] S6: When maintenance or replacement is required, press the button to cause the buckle to abut against the elastic pad and release the buckle from the annular groove. During this process, the spring continues to be compressed. After the buckle is released from the annular groove, the accumulated elastic potential energy will be released and push the connecting rod to move axially, so that the connecting rod can be easily removed.

[0042] The beneficial effects of the present invention are:

[0043] 1. By using a temporary connection plug-in assembly for the connection mechanism, the tube sheet is connected to the first flange, and then connected to the second flange through a locking assembly, so as to avoid the installation inconvenience caused by simultaneous assembly and improve convenience. The step-by-step connection can ensure the installation accuracy and prevent deviation. At the same time, temporary connection is performed by plugging, which further improves convenience.

[0044] 2. By setting a protrusion on the connecting rod, the structure is simple, and the protrusion is used as the head of a traditional bolt. After the connecting rod is connected to the connector, the tube sheet and the first flange can be temporarily connected and fixed to ensure installation accuracy and convenience.

[0045] 3. By adopting the extension part, it is convenient to ensure the coaxiality between the second flange, the tube sheet and the second flange, ensure the installation accuracy of the temporary connection, and when the final fixation is performed through the locking assembly, it is convenient to ensure that the second flange does not deviate, which facilitates the installation of the second flange.

[0046] 4. The disassembly is performed by pressing, which improves the convenience of the maintenance and replacement of the tube bundle. The setting of the spring enables the connecting rod to be pushed to slide out axially after the connecting rod is released, further improving the convenience of the maintenance and replacement of the tube bundle. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the structure of the present invention;

[0048] Figure 2 is a top view of the present invention;

[0049] Figure 3 It is a cross-sectional view at AA of the present invention;

[0050] Figure 4 The present invention Figure 3 The enlarged view of point B in the middle;

[0051] Figure 5 is an exploded view of the present invention;

[0052] Figure 6 is an exploded view of the connector of the present invention;

[0053] The markings in the figure are as follows: 1. first flange; 2. second flange; 3. tube sheet; 30. groove; 4. tube bundle; 5. plug-in assembly; 50. connecting rod; 500. extension; 51. protrusion; 52. plug-in; 520. shell; 521. annular groove; 522. buckle; 523. end cover; 524. elastic pad; 525. button; 526. spring; 53. fastener; 6. locking assembly. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0055] Embodiment 1:

[0056] This embodiment provides a tube bundle 4 installation device for a tubular heat exchanger, including a kettle body and a tube box, and the installation device includes:

[0057] The first flange 1 is connected to the side of the kettle body;

[0058] The second flange 2 is connected to the side of the pipe box;

[0059] The tube sheet 3 is installed between the first flange 1 and the second flange 2 and is provided with a tube bundle 4 extending toward one side of the kettle body;

[0060] The connection mechanism includes a plug-in assembly 5 for temporary connection between the tube sheet 3 and the first flange 1 and a locking assembly 6 for fastening connection between the first flange 1, the second flange 2 and the tube sheet 3;

[0061] Among them, the kettle body and the tube box are conventional structures of a tubular heat exchanger, which are prior art and will not be described here;

[0062] The locking assembly 6 can use traditional bolts and nuts to reduce costs.

[0063] It can be seen from the present embodiment that, by using a temporary connection plug-in assembly 5 for the connection mechanism, the tube sheet 3 is connected to the first flange 1, and then connected to the second flange 2 through the locking assembly 6, thereby avoiding the installation inconvenience caused by simultaneous assembly and improving convenience. The step-by-step connection can ensure the installation accuracy and prevent deviation. At the same time, temporary connection is performed by plugging, which further improves convenience.

[0064] Embodiment 2:

[0065] This embodiment provides a tube bundle 4 installation device for a tubular heat exchanger, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0066] There are multiple plug-in components 5 and locking components 6, and they are arranged at equal intervals around the circumference;

[0067] The number of plug-in components 5 is less than the number of locking components 6;

[0068] Meanwhile, specifically, there may be four plug-in components 5 , and there may be twenty locking components 6 , and five locking components 6 are arranged between the plug-in components 5 that are adjacent to each other on the circumference.

[0069] It can be seen from this embodiment that by setting the circumferential equal spacing, the stability during temporary connection is facilitated, the position accuracy between the tube sheet 3 and the first flange 1 is ensured, and the subsequent installation accuracy of the second flange 2 is facilitated. At the same time, the number of plug-in components 5 is less than that of locking components 6, which facilitates the connection strength and stability of the first flange 1, the tube sheet 3 and the second flange 2 after subsequent fixed connection.

[0070] Embodiment 3:

[0071] This embodiment provides a tube bundle 4 installation device for a tube heat exchanger. In addition to the technical solutions of the above embodiments, it also has the following technical features. The plug-in assembly 5 includes:

[0072] The connecting rod 50 has a protrusion 51 at one end and a plug-in connector 52 at the other end passing through the tube sheet 3 and the first flange 1, and the plug-in connector 52 is detachably connected to the connecting rod 50;

[0073] The protrusion 51 is located between the tube sheet 3 and the second flange 2;

[0074] At the same time, the protrusion 51 and the connecting rod 50 adopt an integrated structure.

[0075] It can be seen from the present embodiment that, by setting the raised portion 51, the raised portion 51 is used as the head of a traditional bolt, and the connector 52 is used as a traditional nut, and then the tube sheet 3 and the first flange 1 are connected and fixed by a structure similar to a bolt and a nut, thereby ensuring a temporary connection between the tube sheet 3 and the first flange 1, and the connector 52 is used to improve the convenience of installation.

[0076] Embodiment 4:

[0077] This embodiment provides a tube bundle 4 installation device for a tubular heat exchanger, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0078] The connecting rod 50 extends toward the second flange 2 and passes through the second flange 2 to form an extension portion 500;

[0079] Wherein, a fastener 53 is detachably mounted on the extension portion 500;

[0080] Meanwhile, the extension portion 500 and the connecting rod 50 are in an integrated structure, and the fastener 53 may be a nut.

[0081] It can be seen from the present embodiment that by providing an extension portion 500 on the connecting rod 50, it is convenient to guide the installation of the second flange 2, thereby improving the convenience and accuracy of the installation of the second flange 2, and after the installation of the fastener 53, the connector 52 is used as a bolt-like head to lock the first flange 1, the tube sheet 3 and the second flange 2 to ensure the stability of the installation structure, thereby improving the fixation between the first flange 1, the tube sheet 3 and the second flange 2 at the connector 5, and compensating for the uneven circumferential locking caused by the temporary connection provided by the connector 5.

[0082] Embodiment 5:

[0083] This embodiment provides a tube bundle 4 installation device for a tubular heat exchanger, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0084] A groove 30 matching with the protrusion 51 is formed on one side of the tube sheet 3 close to the protrusion 51;

[0085] The protrusion 51 is built into the groove 30 , and the depth dimension of the groove 30 along the axial direction is greater than the thickness dimension of the protrusion 51 along the axial direction.

[0086] It can be seen from the present embodiment that, by providing the groove 30, the protrusion 51 is built-in, thereby avoiding the influence of the setting of the protrusion 51 on the installation of the second flange 2 and the influence of the sealing between the second flange 2 and the tube sheet 3, and the axial depth dimension of the groove 30 is greater than the axial thickness dimension of the protrusion 51, thereby avoiding the protrusion 51 from the surface of the tube sheet 3 and ensuring the installation of the second flange 2.

[0087] Embodiment 6:

[0088] This embodiment provides a tube bundle 4 installation device for a tubular heat exchanger, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0089] The cross-sections of the protrusion 51 and the groove 30 along the radial direction are both non-circular;

[0090] Among them, non-circular shapes include ellipses, polygons, irregular shapes, etc., and the drawings in the specification describe ellipses.

[0091] It can be seen from this embodiment that by adopting a non-circular radial cross-section of the protrusion 51 and the groove 30, the rotation of the protrusion 51 can be effectively avoided, thereby avoiding the rotation of the connecting rod 50, improving the stability during installation, facilitating the installation and removal of the fastener 53, and improving convenience.

[0092] Embodiment 7:

[0093] This embodiment provides a tube bundle 4 installation device for a tube heat exchanger. In addition to the technical solutions of the above embodiments, it also has the following technical features. The plug-in connector 52 includes:

[0094] The housing 520 is mounted on the side of the first flange 1 and sleeved on the end of the connecting rod 50 away from the protruding portion 51, and a plurality of annular grooves 521 are formed on the surface of the connecting rod 50 located inside the housing 520;

[0095] The buckle 522 is installed in the housing 520 and moves closer to or farther from the axis of the connecting rod 50 on the radial surface and is matched with the annular buckle groove 521;

[0096] A driving structure, installed in the housing 520 and used to promote the reciprocating movement of the buckle 522;

[0097] An end cover 523 is installed on the side of the housing 520 and is used to restrict the driving structure and the buckle 522 in the housing 520;

[0098] When the buckle 522 cooperates with the annular groove 521, the movement of the connecting rod 50 along its axial direction can be restricted;

[0099] At the same time, there are multiple buckles 522 made of metal, such as stainless steel, and four can be used at the same time. A limiting protrusion is also provided on the inner wall of the shell 520 for limiting the buckle 522 to move closer to or away from the axial direction of the connecting rod 50, and the end cover 523 and the shell 520 are connected by threads.

[0100] It can be seen from the present embodiment that the connecting rod 50 is extended into the shell 520 through the tube sheet 3 and the first flange 1, and a plurality of annular grooves 521 cooperate with the buckles 522. When the protrusion 51 abuts against the tube sheet 3, the annular grooves 521 at appropriate positions cooperate with the buckles 522 to realize the connection of the connecting rod 50. The end cover 523 is provided to ensure that the buckle 522 is built-in, thereby preventing dust from entering and affecting the movement of the buckle 522, thereby extending the service life.

[0101] Embodiment 8:

[0102] This embodiment provides a tube bundle 4 installation device for a tubular heat exchanger. In addition to the technical solutions of the above embodiments, it also has the following technical features. The driving structure includes:

[0103] The elastic pad 524 is installed on the side of the buckle 522 away from the axis of the connecting rod 50;

[0104] The button 525 has an end cover 523 extending from one end along the axial direction and the other end abutting against the surface of the buckle 522;

[0105] The surface where the buckle 522 abuts against the button 525 is an inclined surface;

[0106] Meanwhile, the elastic pads 524 are made of rubber and the number thereof corresponds to that of the buckles 522 .

[0107] It can be seen from this embodiment that by using the elastic pad 524 as the driving structure for the buckle 522 to snap into the annular slot 521, when the connecting rod 50 is extended, the buckle 522 will be pushed open and the elastic pad 524 will be compressed. When the buckle 522 cooperates with the annular slot 521, the buckle 522 can be pushed into the annular slot 521, which has an automatic locking effect.

[0108] Then, through the setting of the button 525, when the button 525 is pressed, one end of the button 525 abuts against the inclined surface of the buckle 522, and pushes the buckle 522 to move away from the axial direction of the connecting rod 50, causing the buckle 522 to separate from the annular groove 521, thereby releasing the plug-in and facilitating the disassembly of the connecting rod 50. Moreover, it only needs to be pressed, and no tools are required, which improves convenience.

[0109] Embodiment 9:

[0110] This embodiment provides a tube bundle 4 installation device for a tubular heat exchanger. In addition to the technical solutions of the above embodiments, it also has the following technical features. The driving structure also includes:

[0111] The spring 526 is installed in the button 525, and its two ends are respectively in contact with the inner wall of the button 525 and the axial end surface of the connecting rod 50.

[0112] It can be seen from the present embodiment that, by providing the spring 526, after the connecting rod 50 is released from fixation, the connecting rod 50 can be pushed to slide out axially, thereby further improving the convenience of repairing and replacing the tube bundle 4. Specifically, when the button 525 is pushed, the spring 526 is compressed, and then when the buckle 522 is released from the annular groove 521, the compression potential energy is released, thereby pushing the connecting rod 50, thereby preventing the buckle 522 from re-engaging with the annular groove 521 after the button 525 is released, thereby improving the convenience of disassembly.

[0113] Embodiment 10:

[0114] This embodiment provides a disassembly and assembly process of a tube bundle 4 installation device of a tubular heat exchanger, comprising the following steps:

[0115] S1: Align the tube sheet 3 with the first flange 1, and then select a plurality of suitable positions at equal intervals around the circumference to pass the connecting rod 50 through the tube sheet 3 and the first flange 1, and make the connecting rod 50 extend into the shell 520;

[0116] S2: After the connecting rod 50 extends into the housing 520, it pushes open the buckle 522. After reaching a suitable axial depth, the buckle 522 moves axially under the action of the elastic pad 524 to cooperate with the annular groove 521, and at the same time, the spring 526 is compressed;

[0117] S3: Then align the second flange 2, and make the extension part 500 pass through the second flange 2 and then be fixed by the fastener 53;

[0118] S4: Then, multiple locking assemblies 6 are installed to achieve sequential connection and fixation of the first flange 1, the tube sheet 3, and the second flange 2;

[0119] S5: When maintenance is required, the plurality of locking assemblies 6 are disassembled and the second flange 2 is removed;

[0120] S6: When maintenance or replacement is required, the button 525 is pressed to cause the buckle 522 to abut against the elastic pad 524 and release the engagement between the buckle 522 and the annular groove 521. During this process, the spring 526 continues to be compressed. After the buckle 522 and the annular groove 521 are released, the accumulated elastic potential energy will be released and push the connecting rod 50 to move axially, so that the connecting rod 50 can be easily removed.

[0121] It can be seen from this embodiment that the tube sheet 3 and the first flange 1 are connected by using a temporary connection plug assembly 5 to avoid deviation between the tube sheet 3 and the first flange 1, and then the second flange 2 is aligned and connected to avoid assembly difficulties caused by the heavy tube bundle 4 and unstable center of gravity. In addition, the tube sheet 3 is first connected to the first flange 1, and then the second flange 2 is connected, which is distributed to facilitate the installation of the gasket;

[0122] At the same time, the plug-in method can further improve the convenience of temporary connection between the tube sheet 3 and the first flange 1. No tools are needed. The buckle 522 and the annular groove 521 can be matched by pushing the connecting rod 50. When disassembling, only the button 525 needs to be pressed, which effectively ensures convenience.

[0123] Furthermore, the connection between the tube sheet 3 and the first flange 1 and the installation of the second flange 2 can ensure the coaxiality between the tube sheet 3 and the first flange 1 and the second flange 2, thereby effectively ensuring the installation accuracy and avoiding leakage problems caused by skewed installation.

[0124] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A tube bundle installation device for a tubular heat exchanger, comprising a kettle body and a tube box, It is characterized in that The tube bundle installation device includes: A first flange (1) connected to the side of the kettle body; A second flange (2) connected to the side of the pipe box; A tube sheet (3) is installed between the first flange (1) and the second flange (2) and is provided with a tube bundle (4) extending toward one side of the kettle body; The connection mechanism comprises a plug-in assembly (5) for temporarily connecting the tube sheet (3) and the first flange (1) and a locking assembly (6) for firmly connecting the first flange (1), the second flange (2) and the tube sheet (3); Wherein, the plug-in assembly (5) comprises: A connecting rod (50) having a protrusion (51) at one end and a plug-in connector (52) at the other end passing through the tube sheet (3) and the first flange (1), wherein the plug-in connector (52) is detachably connected to the connecting rod (50); Wherein, the protrusion (51) is located between the tube plate (3) and the second flange (2); Wherein, the plug connector (52) comprises: A housing (520) is mounted on the side of the first flange (1) and sleeved on an end of the connecting rod (50) away from the protruding portion (51), and a plurality of annular grooves (521) are formed on the surface of the connecting rod (50) located inside the housing (520); The buckle (522) is installed in the housing (520) and moves closer to or farther away from the axis of the connecting rod (50) on a radial surface and is matched with the annular buckle groove (521); A driving structure, installed in the housing (520) and used to promote the reciprocating movement of the buckle (522); An end cover (523) is installed on the side of the housing (520) and is used to restrict the driving structure and the buckle (522) within the housing (520); Wherein, when the buckle (522) cooperates with the annular clamping groove (521), the movement of the connecting rod (50) along its axial direction can be restricted.

2. The tube bundle installation device of the tubular heat exchanger according to claim 1, Features: The plug-in components (5) and the locking components (6) are both multiple and arranged at equal intervals around the circumference; Wherein, the number of the plug-in components (5) is less than the number of the locking components (6).

3. The tube bundle installation device of the tubular heat exchanger according to claim 1, Features: The connecting rod (50) extends toward the second flange (2) and passes through the second flange (2) to form an extension portion (500); Wherein, a fastener (53) is detachably mounted on the extension portion (500).

4. The tube bundle installation device of the tubular heat exchanger according to claim 1, Features: A groove (30) matching the protrusion (51) is formed on one side of the tube plate (3) close to the protrusion (51); The protrusion (51) is built into the groove (30), and the depth dimension of the groove (30) along the axial direction is greater than the thickness dimension of the protrusion (51) along the axial direction.

5. The tube bundle installation device of the tubular heat exchanger according to claim 4, Features: The radial cross-sections of the protrusion (51) and the groove (30) are both non-circular.

6. The tube bundle installation device of the tubular heat exchanger according to claim 1, It is characterized in that The driving structure comprises: An elastic pad (524) is mounted on a side of the buckle (522) away from the axis of the connecting rod (50); A button (525) has an end cover (523) extending from one end along the axial direction and the other end abutting against the surface of the buckle (522); Wherein, the surface where the buckle (522) abuts against the button (525) is an inclined surface.

7. The tube bundle installation device of the tubular heat exchanger according to claim 6, It is characterized in that The driving structure further includes: The spring (526) is installed in the button (525), and two ends thereof are respectively in contact with the inner wall of the button (525) and the axial end surface of the connecting rod (50).

8. A disassembly and assembly process for the tube bundle installation device of the tube heat exchanger according to claim 7, It is characterized in that The following steps are involved: S1: Aligning the tube sheet (3) with the first flange (1), and then selecting a plurality of suitable positions at equal intervals around the circumference to pass the connecting rod (50) through the tube sheet (3) and the first flange (1), and allowing the connecting rod (50) to extend into the shell (520); S2: After the connecting rod (50) extends into the housing (520), the buckle (522) is pushed open, and after reaching a suitable axial depth, the buckle (522) moves axially under the action of the elastic pad (524) to cooperate with the annular groove (521), and at the same time, the spring (526) is compressed; S3: Then aligning the second flange (2), and allowing the extension portion (500) to pass through the second flange (2) and then be fixed by a fastener (53); S4: Then, a plurality of locking assemblies (6) are installed to achieve sequential connection and fixation of the first flange (1), the tube sheet (3), and the second flange (2); S5: When maintenance is required, the plurality of locking assemblies (6) are disassembled and the second flange (2) is removed; S6: When maintenance or replacement is required, the button (525) is pressed to cause the buckle (522) to abut against the elastic pad (524) and release the engagement between the buckle (522) and the annular groove (521). During this process, the spring (526) continues to be compressed. After the buckle (522) and the annular groove (521) are released, the accumulated elastic potential energy is released and pushes the connecting rod (50) to move axially, so that the connecting rod (50) can be easily removed.

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