Tubular heat exchanger

Abstract

The utility model discloses a tubular heat exchanger, which relates to the technical field of heat exchangers, and is characterized by comprising a tube box, an isolation assembly and a shell, the tube box is detachably connected with the shell through an isolation assembly; the tube box is connected with a water inlet, the shell is connected with a water outlet, and the water inlet and the water outlet are eccentrically arranged; a plurality of heat exchange tubes are arranged in the shell, and the heat exchange tubes are detachably connected to the isolation assembly; the water inlet and the water outlet are eccentrically and clockwise arranged, so that vortex can be formed when a shell pass medium flows into the shell, dead zones are reduced, meanwhile, the vortex can increase the flow speed of the shell pass medium, the shell pass medium scours the U-shaped solenoid bundle in a directional mode, the heat exchange efficiency is improved, the scouring strength of the medium is improved, and scaling and blocking on a heat exchange pipe are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a tubular heat exchanger. Background Art

[0002] The tubular heat exchanger is a partition-type heat exchanger that uses the wall of the tube bundle enclosed in the shell as the heat transfer surface. The traditional tubular heat exchanger uses welding connections between the tube sheet and the tube side and the shell side, so the tube bundle cannot be pulled out, and the heat exchange tube is wound inside the shell side, making it more difficult to clean the shell side, and the requirements for the medium are higher, so only clean media can be used;

[0003] In the existing patents, for example, patent number CN218787754U, the patent name is a heat exchanger device with enhanced heat transfer, which discloses that a partition plate is fixedly connected to the inner cavity of the shell, and the partition plate divides the inner cavity of the shell into a heat exchange chamber and a first fluid chamber. A plurality of connecting holes are opened on the partition plate, and a plurality of connecting holes are connected to the inlet and outlet of a plurality of U-shaped tubes. However, the shell is an integral structure, and the internal heat exchange tubes cannot be pulled out, so that the heat exchange tubes and the interior of the shell cannot be disassembled and cleaned. Utility Model Content

[0004] The present application provides a tubular heat exchanger to solve the above-mentioned technical problem that the heat exchange tube and the shell cannot be disassembled and are difficult to clean.

[0005] The present application provides a tubular heat exchanger, comprising a tube box, an isolation assembly and a shell; the tube box and the shell are detachably connected via the isolation assembly; the tube box is connected to a water inlet, the shell is connected to a water outlet, the water inlet and the water outlet are eccentrically arranged; a plurality of heat exchange tubes are arranged inside the shell, and the heat exchange tubes are detachably connected to the isolation assembly.

[0006] The present application relates to a tubular heat exchanger, which also includes the following additional technical features:

[0007] A partition plate is provided inside the pipe box, one side of the partition plate in the length direction is connected to the inner wall of the pipe box, and the other side is connected to the isolation component. The interior of the pipe box is divided into a first fluid chamber and a second fluid chamber by the partition plate; the first fluid chamber is connected to a medium inlet for the shell-side medium to enter, and the second fluid chamber is connected to a medium outlet for the shell-side medium to flow out.

[0008] The isolation component in the first fluid cavity has a first mounting hole connected to the input end of the heat exchange tube; the isolation component in the second fluid cavity has a second mounting hole connected to the output end of the heat exchange tube; the center of the isolation component is connected to a central tube for winding the heat exchange tube.

[0009] The winding path of the heat exchange tube is spiral winding along the outer wall of the central tube; or, the heat exchange tube is spirally wound along the outer wall of the central tube and then transitions to U-shaped winding at the head section.

[0010] The isolation assembly includes a first flange and a tube sheet, the tube sheet is connected to the tube box, the first flange is connected to the shell, and the tube sheet and the first flange are connected by bolts; or, the isolation assembly includes a first flange, a second flange and a tube sheet, the first flange is connected to the shell, and the second flange is connected to the tube box; the tube sheet is connected between the first flange and the second flange.

[0011] The shell is connected with a first flange connection seat, and the pipe box is connected with a second flange connection seat; the first flange is connected to the first flange connection seat by bolts, and the second flange is connected to the second flange connection seat by bolts.

[0012] The isolation assembly includes a partition, a connecting plate and a fixing rod; the connecting plate includes a first connecting plate connected to the pipe box and a second connecting plate connected to the shell; the partition is located between the pipe box and the shell, and the partition is connected to the first connecting plate and the second connecting plate through a fixing rod.

[0013] The partition is provided with an annular groove on its circumference to form a mounting position for the first connecting plate and the second connecting plate. The mounting position is provided with an opening, and the fixing rod passes through the opening and is fixedly connected to the first connecting plate and the second connecting plate by bolts.

[0014] The first connection disk has a first connection end that is clamped to the annular groove, and the second connection disk has a second connection end that is clamped to the annular groove. The first connection end and the second connection end are correspondingly arranged on both sides of the annular groove in the radial direction.

[0015] The first connection end is provided with a first connection hole corresponding to the opening, the second connection end is provided with a second connection hole corresponding to the opening, and the fixing rod is sequentially installed in the first connection hole, the opening, and the second connection hole.

[0016] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0017] 1. A tubular heat exchanger, comprising a tube box, an isolation assembly and a shell; the tube box and the shell are detachably connected via the isolation assembly; the tube box is connected with a water inlet, the shell is connected with a water outlet, the water inlet and the water outlet are eccentrically arranged; a plurality of heat exchange tubes are arranged inside the shell, and the heat exchange tubes are detachably connected to the isolation assembly. The water inlet and the water outlet are eccentrically arranged clockwise, so that the shell-side medium forms a vortex when flowing into the shell, reducing the occurrence of dead zones, and at the same time, the vortex can increase the flow rate of the shell-side medium, so that the shell-side medium can directionally flush the U-shaped solenoid bundle, thereby increasing the heat exchange efficiency and increasing the flushing force of the medium to reduce scaling and blockage on the heat exchange tube.

[0018] In addition, the isolation assembly and the pipe box and the shell, as well as the isolation assembly and the heat exchange tube are all detachable structures, so that the heat exchange tube can be easily inserted into or withdrawn from the shell, which provides convenience for maintenance and cleaning. The thermal deformation of the heat exchange tube and the shell does not constrain each other, and the heat exchange tubes and the heat exchange tubes and the shell are easy to clean without generating thermal stress; the requirements for the medium are reduced; it can be applied to a variety of occasions, especially to occasions with severe scaling, thus improving the versatility of the device.

[0019] 2. As an embodiment of the present application, a partition plate is provided inside the pipe box, one side of the partition plate in the length direction is connected to the inner wall of the pipe box, and the other side is connected to the isolation component, and the interior of the pipe box is divided into a first fluid cavity and a second fluid cavity by the partition plate; the first fluid cavity is connected to a medium inlet for the shell-side medium to enter, and the second fluid cavity is connected to a medium outlet for the shell-side medium to flow out. The interior of the pipe box is divided into two cavities by the isolation component, which increases the path for the medium to flow and improves the heat exchange efficiency.

[0020] 3. As an implementation mode of the present application, the winding path of the heat exchange tube is spiral winding along the outer wall of the central tube; or, the heat exchange tube is spirally wound along the outer wall of the central tube and then transitions to U-shaped winding at the head section. The heat exchange tube adopts a U-shaped structure because under the same diameter, the U-shaped winding method will maximize the heat exchange area of ​​the heat exchanger; the U-shaped heat exchange tube has a simple and compact structure, high sealing performance, easy maintenance and cleaning, minimal metal consumption under high temperature and high pressure, and the lowest cost; it only needs to be connected to an isolation component, has good thermal compensation performance, and strong pressure bearing capacity, and is suitable for operation under high temperature and high pressure conditions.

[0021] 4. As an embodiment of the present application, the isolation assembly includes a first flange and a tube sheet, the tube sheet is connected to the tube box, the first flange is connected to the shell, and the tube sheet and the first flange are connected by bolts; or, the isolation assembly includes a first flange, a second flange and a tube sheet, the first flange is connected to the shell, and the second flange is connected to the tube box; the tube sheet is connected between the first flange and the second flange. The detachable connection between the tube box and the shell allows the interior of the tube box or the shell to be cleaned; and the tube bundle can be easily inserted into or removed from the shell, which provides convenience for maintenance and cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 This is a schematic structural diagram of a tubular heat exchanger in one embodiment of the utility model;

[0024] Figure 2 This is a schematic structural diagram of a tube sheet of a tubular heat exchanger in one embodiment of the utility model;

[0025] Figure 3 It is a right side schematic diagram of a shell of a tubular heat exchanger in one embodiment of the utility model;

[0026] In the figure,

[0027] 1 pipe box;

[0028] 2 isolation assembly, 21 first flange, 22 second flange, 23 tube sheet;

[0029] 3 shell, 4 center tube, 5 partition plate, 6 heat exchange tube, 7 medium inlet, 8 medium outlet, 9 water inlet, 10 water outlet. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the present application and the features in each embodiment may be combined with each other without conflict.

[0032] In addition, in the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0035] like Figures 1 to 3 As shown, the present application provides a tubular heat exchanger, comprising a tube box 1, an isolation assembly 2 and a shell 3; the tube box 1 and the shell 3 are detachably connected via the isolation assembly 2; a water inlet 9 is connected to the tube box 1, a water outlet 10 is connected to the shell 3, and the water inlet 9 and the water outlet 10 are eccentrically arranged; a plurality of heat exchange tubes 6 are arranged inside the shell 3, and the heat exchange tubes 6 are detachably connected to the isolation assembly 2.

[0036] The pipe box 1 is used to store heat exchange medium, and the shell 3 is used to store shell-side medium. The heat in the heat exchange medium is transferred to the shell-side medium, so that the shell-side medium, which is a cold fluid, is heated up to become a hot fluid. A plurality of heat exchange tubes 6 are arranged inside the shell 3, and the input end of the heat exchange tube 6 is connected to the inside of the pipe box 1, so that the heat exchange medium flows from the outside into the inside of the pipe box 1 and then enters the plurality of heat exchange tubes 6, and the wall surface of the heat exchange tube 6 transfers the heat to the shell-side medium in the shell 3.

[0037] The water inlet 9 and the water outlet 10 are arranged eccentrically clockwise, which can form a vortex when the shell-side medium flows into the shell 3, reducing the occurrence of dead zones. At the same time, the vortex can increase the flow rate of the shell-side medium, so that the shell-side medium can directionally flush the U-shaped solenoid bundle, thereby increasing the heat exchange efficiency and increasing the flushing force of the medium to reduce scaling and blockage on the heat exchange tube 6.

[0038] like Figure 1 As shown, the present application designs the pipe box 1 and the shell 3 from the traditional integrated structure to a detachable connection, and the detachable connection between the pipe box 1 and the shell 3 is realized by setting an isolation component 2 between the pipe box 1 and the shell 3. The isolation component 2 and the pipe box 1 and the shell 3, and the isolation component 2 and the heat exchange tube 6 are all detachable structures, so that the heat exchange tube 6 can be easily inserted into or pulled out of the shell 3, which provides convenience for maintenance and cleaning. The thermal deformation of the heat exchange tube 6 and the shell 3 does not constrain each other, and the heat exchange tubes 6 and the heat exchange tubes 6 and the shell 3 are easy to clean, and no thermal stress is generated; the requirements for the medium are reduced; it can be applied to a variety of occasions, especially to occasions where scaling is relatively serious, and the versatility of the device is improved.

[0039] The structure of the isolation component 2 is not limited to the embodiments listed in this application, and specifically, any one of the following embodiments may be adopted:

[0040] Embodiment 1: The isolation assembly 2 includes a first flange 21 and a tube sheet 23, the tube sheet 23 is connected to the tube box 1, the first flange 21 is connected to the shell 3, and the tube sheet 23 is connected to the first flange 21 by bolts; or, the isolation assembly 2 includes a first flange 21, a second flange 22 and a tube sheet 23, the first flange 21 is connected to the shell 3, and the second flange 22 is connected to the tube box 1; the tube sheet 23 is connected between the first flange 21 and the second flange 22.

[0041] Embodiment 1: The isolation assembly 2 includes a first flange 21 and a tube sheet 23; the first flange 21 is connected to the outer circumferential direction of the shell 3, the tube sheet 23 is connected to the inside of the box body, and the radial direction of the tube sheet 23 extends outside the tube box 1, the purpose is to reserve enough space for connection with the first flange 21, the connection end of the tube sheet 23 extending outside the tube box 1 has a bolt hole corresponding to the first flange 21, and the tube sheet 23 is fixedly connected to the shell 3 by bolts inserted into the first flange 21 and the bolt holes on the tube sheet 23; when it is necessary to disassemble the tube box 1 and the shell 3, the bolts are removed in turn, and the first flange 21 and the tube sheet 23 are separated. In this embodiment, the tube sheet 23 and the tube box 1 are connected to form an integrated structure, and the tube sheet 23 is detachably connected to the first flange 21 on the outside of the shell 3 to realize the detachable connection between the tube box 1 and the shell 3.

[0042] Embodiment 2: The isolation assembly 2 includes a first flange 21, a second flange 22 and a tube sheet 23; the first flange 21 is connected to the outer circumferential surface of the shell 3, the second flange 22 is connected to the outer circumferential surface of the pipe box 1 corresponding to the first flange 21, and the tube sheet 23 is used as a separate structural member. The tube sheet 23 has mounting holes corresponding to the first flange 21 and the second flange 22. During installation, after the tube sheet 23 is placed in the correct installation position between the first flange 21 and the second flange 22, the bolts are passed through the first flange 21, the mounting holes and the second flange 22 in sequence to fix the tube sheet 23 with the first flange 21 and the second flange 22, thereby realizing the connection between the pipe box 1 and the shell 3; during disassembly, after the bolts connected to the first flange 21, the tube sheet 23 and the second flange 22 are removed in sequence, the first flange 21 is separated from the tube sheet 23 and the second flange 22, thereby realizing the separation between the pipe box 1 and the tube sheet 23 and the shell 3.

[0043] Preferably, the pipe box 1 is connected with a first flange 21 connection seat, and the shell 3 is connected with a second flange 22 connection seat; the first flange 21 is connected to the first flange 21 connection seat by bolts, and the second flange 22 is connected to the second flange 22 connection seat by bolts. When the first flange 21 is connected to the shell 3, it is fixedly connected to the shell 3 through the first connection seat, so as to protect the first flange 21 and increase the connection strength between the first flange 21 and the shell 3; similarly, a second flange 22 connection seat is provided between the pipe box 1 and the second flange 22.

[0044] Embodiment 2: The isolation assembly 2 includes a partition, a connecting plate and a fixing rod; the connecting plate includes a first connecting plate connected to the pipe box 1 and a second connecting plate connected to the shell 3; the partition is located between the pipe box 1 and the shell 3, and the partition is connected to the first connecting plate and the second connecting plate through a fixing rod.

[0045] The partition plate in this embodiment has the same function as the tube sheet 23, and the purpose is to form two independent liquid flow cavities between the tube box 1 and the shell 3. The tube box 1 forms a medium flow cavity for storing the heat exchange medium, and the shell 3 forms a liquid flow cavity for storing the shell-side medium. In this embodiment, the partition plate is designed as an independent structure, and a detachable connection is achieved between the tube box 1 and the shell 3 through a connecting plate. Specifically, the connecting plate is provided as a first connecting plate and a second connecting plate having the same structure and symmetrically arranged. The first connecting plate and the second connecting plate are L-shaped structures. Since the first connecting plate and the second connecting plate have the same structure, in order to simplify the description, the first connecting plate is taken as an example for detailed description:

[0046] The first connecting plate includes a first connecting plate body, a first connecting end that is clamped in the annular groove described below and a first fixed end that is connected to the pipe box 1; the first connecting end and the first fixed end are connected to both sides of the first connecting plate body; the first fixed end is perpendicular to the first connecting plate body, and the first connecting end is connected to the first connecting plate body in an inverted U shape. When connected to the partition, the inverted U-shaped structure of the first connecting end is embedded in the annular groove described below on the circumferential side of the partition. The first connecting end protrudes from the connecting plate body and is arranged on one side along the radial direction of the connecting plate body. The cross-sectional shape of the first connecting end can be a rectangle, or it can also be a first connecting end with a certain arc transition section on the end face, so as to facilitate fitting with the outer circumferential surface of the tube sheet 23.

[0047] Similarly, the second connecting disk includes a second connecting disk body, which is clamped to the second connecting end of the annular groove described below and the second fixed end connected to the shell 3; the second connecting end and the second fixed end are connected to the two sides of the second connecting disk body; the second connecting disk has the same structure as the first connecting disk, which will not be repeated here.

[0048] When the tube box 1 is connected to the shell 3, the first connecting end and the second connecting end are correspondingly arranged on both sides of the annular groove in the radial direction. When the first connecting end is embedded in one side of the annular groove, the second connecting end is embedded in the side of the annular groove symmetrical to the first connecting end, so that the forces on both sides of the tube sheet 23 are uniform.

[0049] As a preferred embodiment, an annular groove is arranged around the partition to form a mounting position for the first connecting plate and the second connecting plate, and an opening is arranged on the mounting position. The fixing rod passes through the opening and is fixedly connected to the first connecting plate and the second connecting plate by bolts.

[0050] The first connection end is provided with a first connection hole corresponding to the opening, the second connection end is provided with a second connection hole corresponding to the opening, and the fixing rod is sequentially installed in the first connection hole, the opening, and the second connection hole.

[0051] Preferably, an internal thread is provided in the opening, an internal thread is provided in the first connecting hole and the second connecting hole, and an external thread matching the internal thread is provided on the fixing rod, so that the fixing rod is threadedly connected to the first connecting hole and the second connecting hole, thereby increasing the connection strength between the first connecting plate, the second connecting plate and the partition.

[0052] As a preferred embodiment, a partition plate 5 is provided inside the pipe box 1, one side of the partition plate 5 in the length direction is connected to the inner wall of the pipe box 1, and the other side is connected to the isolation component 2, and the interior of the pipe box 1 is divided into a first fluid chamber and a second fluid chamber by the partition plate 5; the first fluid chamber is connected to a medium inlet 7 for the shell-side medium to enter, and the second fluid chamber is connected to a medium outlet 8 for the shell-side medium to flow out.

[0053] The partition plate 5 is arranged to divide the space between the tube sheet 23 and the tube box 1 into two, so that the interior of the tube box 1 is divided into a first fluid cavity and a second fluid cavity. The first fluid cavity is used to realize the inflow of heat exchange medium, and the second fluid cavity is used to realize the outflow of heat exchange medium. The input end of the heat exchange tube 6 is connected with the first fluid cavity, and the output end of the heat exchange tube 6 is connected with the second fluid cavity. The heat exchange medium flows into the first fluid cavity through the medium inlet 7, and flows into the heat exchange tube 6 through the input end of the heat exchange tube 6. The heat is transferred to the shell-side medium by the tube wall of the heat exchange tube 6, and then flows out from the output end of the heat exchange tube 6 and flows out through the medium outlet 8, completing the heat exchange of the shell-side medium.

[0054] In order to realize the connection between the first fluid cavity and the input end of the heat exchange tube 6, the isolation component 2 in the first fluid cavity has a first mounting hole connected to the input end of the heat exchange tube 6; the isolation component 2 in the second fluid cavity has a second mounting hole connected to the output end of the heat exchange tube 6; the center of the isolation component 2 is connected to a central tube 4 for winding the heat exchange tube 6.

[0055] Preferably, the winding path of the heat exchange tube 6 is spiral winding along the outer wall of the central tube 4; or, the heat exchange tube 6 is spirally wound along the outer wall of the central tube 4 and then transitions to U-shaped winding at the end section. The heat exchange tube 6 is arranged in a spiral winding form, and when the tube is wound to the tail of the central tube 4, the winding direction is changed to U-shaped winding, and then arranged in a spiral winding form until the vicinity of the tube sheet 23, and the heat exchange tube 6 is connected to the tube sheet 23 at the outlet side of the tube pass. When winding, the heat exchange tube 6 is alternately wound in a spiral shape in the space between the central tube 4 and the shell 3, and the winding directions of the adjacent two layers of heat exchange tubes 6 are opposite, and a certain shape of spacing pieces are used to maintain a certain distance.

[0056] The heat exchange tube 6 adopts a U-shaped structure because under the same diameter, the U-shaped winding method will maximize the heat exchange area of ​​the heat exchanger; the U-shaped heat exchange tube 6 has a simple and compact structure, high sealing performance, easy maintenance and cleaning, minimal metal consumption under high temperature and high pressure, and the lowest cost; it only needs to be connected to an isolation component 2, has good thermal compensation performance and strong pressure bearing capacity, and is suitable for operation under high temperature and high pressure conditions.

[0057] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0058] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0059] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A tubular heat exchanger, characterized in that: It includes a pipe box, an isolation component and a shell; the pipe box and the shell are detachably connected through the isolation component; the pipe box is connected to a water inlet, the shell is connected to a water outlet, and the water inlet and the water outlet are eccentrically arranged; a plurality of heat exchange tubes are arranged inside the shell, and the heat exchange tubes are detachably connected to the isolation component.

2. A tubular heat exchanger according to claim 1, characterized in that: A partition plate is provided inside the pipe box, one side of the partition plate in the length direction is connected to the inner wall of the pipe box, and the other side is connected to the isolation component. The interior of the pipe box is divided into a first fluid chamber and a second fluid chamber by the partition plate; the first fluid chamber is connected to a medium inlet for the shell-side medium to enter, and the second fluid chamber is connected to a medium outlet for the shell-side medium to flow out.

3. A tubular heat exchanger according to claim 2, characterized in that: The isolation component in the first fluid cavity has a first mounting hole connected to the input end of the heat exchange tube; the isolation component in the second fluid cavity has a second mounting hole connected to the output end of the heat exchange tube; the center of the isolation component is connected to a central tube for winding the heat exchange tube.

4. A tubular heat exchanger according to claim 3, characterized in that: The winding path of the heat exchange tube is spiral winding along the outer wall of the central tube; or, the heat exchange tube is spirally wound along the outer wall of the central tube and then transitions to U-shaped winding at the head section.

5. The tubular heat exchanger according to claim 1, characterized in that: The isolation assembly includes a first flange and a tube sheet, the tube sheet is connected to the tube box, the first flange is connected to the shell, and the tube sheet and the first flange are connected by bolts; or, the isolation assembly includes a first flange, a second flange and a tube sheet, the first flange is connected to the shell, and the second flange is connected to the tube box; the tube sheet is connected between the first flange and the second flange.

6. A tubular heat exchanger according to claim 5, characterized in that: The pipe box is connected with a first flange connection seat, and the shell is connected with a second flange connection seat; the first flange is connected to the first flange connection seat by bolts, and the second flange is connected to the second flange connection seat by bolts.

7. The tubular heat exchanger according to claim 1, characterized in that: The isolation assembly includes a partition, a connecting plate and a fixing rod; the connecting plate includes a first connecting plate connected to the pipe box and a second connecting plate connected to the shell; the partition is located between the pipe box and the shell, and the partition is connected to the first connecting plate and the second connecting plate through a fixing rod.

8. A tubular heat exchanger according to claim 7, characterized in that: The partition is provided with an annular groove on its circumference to form a mounting position for the first connecting plate and the second connecting plate. The mounting position is provided with an opening, and the fixing rod passes through the opening and is fixedly connected to the first connecting plate and the second connecting plate by bolts.

9. A tubular heat exchanger according to claim 8, characterized in that: The first connection disk has a first connection end that is clamped to the annular groove, and the second connection disk has a second connection end that is clamped to the annular groove. The first connection end and the second connection end are correspondingly arranged on both sides of the annular groove in the radial direction.

10. A tubular heat exchanger according to claim 9, characterized in that: The first connection end is provided with a first connection hole corresponding to the opening, the second connection end is provided with a second connection hole corresponding to the opening, and the fixing rod is sequentially installed in the first connection hole, the opening, and the second connection hole.

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