Shell-and-tube heat exchanger capable of freely expanding

Abstract

The utility model discloses a shell-and-tube heat exchanger capable of freely expanding, which comprises an upper seal head, a lower seal head and a cylinder body arranged between the upper seal head and the lower seal head, a plurality of heat exchange tubes arranged along the axis direction of the cylinder body are arranged in the cylinder body, an upper tube plate is fixedly arranged on the side of the cylinder body close to the upper seal head, and a lower tube plate is fixedly arranged on the side of the cylinder body close to the lower seal head. The upper tube plate is fixedly connected with the upper sealing head through a bolt, a lower tube plate is fixedly installed on the side, close to the barrel body, of the lower sealing head, the barrel body is arranged on the lower tube plate in a sealing and sleeving mode, when the barrel body is not fixedly connected with the lower tube plate, the barrel body can axially move relative to the lower tube plate, and the heat exchange tubes are installed on the upper tube plate and the lower tube plate. The cylinder body and the lower tube plate are hermetically sleeved, so that the top wall of the lower tube plate extends into the cylinder body, and the utility model has the advantages of convenience in overhaul and maintenance and the like.

Description

Technical Field

[0001] This utility model belongs to the technical field of heat exchange equipment, specifically relating to a shell-and-tube heat exchanger that can expand freely. Background Technology

[0002] A common shell-and-tube heat exchanger structure includes an upper head, a lower head, and a shell fixedly installed between the upper and lower heads. Heat exchange tubes are arranged inside the shell. The shell is fixed to the upper head by an upper tube sheet, and to the lower head by a lower tube sheet, with the bottom of the shell and the top wall of the lower tube sheet on the same plane. However, this common shell-and-tube heat exchanger suffers from inconvenience in inspection and maintenance, especially in replacing damaged heat exchange tubes, and the sealing between the shell and the lower tube sheet is relatively poor. Utility Model Content

[0003] To address the technical problems mentioned in the background section, the present invention aims to provide a shell-and-tube heat exchanger that can expand freely.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] This utility model provides a freely expandable shell-and-tube heat exchanger, comprising an upper head, a lower head, and a cylinder installed between the upper and lower heads. The cylinder contains a plurality of heat exchange tubes arranged along its axial direction. An upper tube sheet is fixedly installed on the cylinder near the upper head, and the upper tube sheet is bolted to the upper head. A lower tube sheet is fixedly installed on the lower head near the cylinder. The cylinder is sealed and fitted onto the lower tube sheet. When the cylinder is not fixedly connected to the lower tube sheet, the cylinder can move axially relative to the lower tube sheet. The heat exchange tubes are installed on the upper and lower tube sheets.

[0006] Furthermore, a first flange is fixedly installed on the peripheral wall of the cylinder near the lower tube sheet, and a second flange is fixedly installed on the peripheral wall of the lower tube sheet. The first flange and the second flange are connected by bolts to fix the cylinder to the lower end cap, and the top wall of the lower tube sheet extends into the cylinder.

[0007] Furthermore, the bottom wall of the first flange and the top wall of the cylinder are basically on the same plane, and the top wall of the lower tube sheet is located above the top wall of the second flange.

[0008] Furthermore, the abutment between the first flange and the second flange enables the formation of an annular space between the cylinder, the second flange, and the lower tube sheet, and an O-ring is installed in the annular space.

[0009] Furthermore, the inner wall at the bottom of the cylinder is provided with an inclined edge that slopes away from the outer wall of the lower tube sheet, and the inclined edge forms an annular space with a triangular cross-section between the second flange and the lower tube sheet.

[0010] Furthermore, the angle between the tilting direction of the inclined edge and the axis of the lower tube sheet is 30°.

[0011] Furthermore, the first flange is fixedly connected to the cylinder as a single unit.

[0012] Furthermore, the second flange is fixedly connected to the lower tube sheet as a single unit.

[0013] Beneficial effects: This utility model has the advantage of convenient inspection and maintenance, especially the heat exchange tubes inside the cylinder are easy to replace when they are damaged. When replacing, you only need to first loosen the connecting bolts between the first flange and the second flange, and then pull out the lower tube sheet and the heat exchange tubes for replacement. This utility model seals the cylinder and the lower tube sheet together, and the top wall of the lower tube sheet extends into the cylinder, which enhances the sealing performance inside the cylinder. Attached Figure Description

[0014] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration:

[0015] Figure 1 This is a schematic diagram of the shell-and-tube heat exchanger structure according to an embodiment of the present utility model;

[0016] Figure 2 This is an embodiment of the present utility model. Figure 1 A magnified view of part A in the middle;

[0017] Figure 3 This is a schematic diagram of the annular space in an embodiment of the present invention.

[0018] The following labels are used in the attached diagram: Upper head 1, High-temperature medium inlet 101, Lower head 2, High-temperature medium outlet 201, Cylinder 3, Heat exchange tube 301, First flange 302, Inclined edge 303, Low-temperature medium outlet 304, Low-temperature medium inlet 305, Baffle 306, Upper tube sheet 4, Lower tube sheet 5, Second flange 501, Annular space 6, O-ring seal 7. Detailed Implementation

[0019] like Figures 1-3As shown, a shell-and-tube heat exchanger capable of free expansion includes: an upper head 1, a lower head 2, and a cylinder 3 installed between the upper head 1 and the lower head 2. Multiple heat exchange tubes 301 are arranged inside the cylinder 3 along the axial direction of the cylinder 3. An upper tube sheet 4 is fixedly installed on the cylinder 3 near the upper head 1, and the upper tube sheet 4 is fixedly connected to the upper head 1 by bolts. A lower tube sheet 5 is fixedly installed on the lower head 2 near the cylinder 3. The cylinder 3 is sealed and fitted onto the lower tube sheet 5. When the cylinder 3 is not fixedly connected to the lower tube sheet 5, the cylinder 3 can move axially (i.e., freely expand) relative to the lower tube sheet 5. The heat exchange tubes 301 are installed on the upper tube sheet 4 and the lower tube sheet 5.

[0020] In this design, the shell-and-tube heat exchanger is sealed together with the lower tube sheet 5, and the top wall of the lower tube sheet 5 extends into the shell-and-tube heat exchanger. This not only enhances the sealing performance inside the shell-and-tube heat exchanger, but also facilitates the assembly and disassembly of the shell-and-tube heat exchanger.

[0021] In one embodiment of this utility model, a first flange 302 is fixedly installed on the peripheral wall of the cylinder 3 near the lower tube sheet 5, and a second flange 501 is fixedly installed on the peripheral wall of the lower tube sheet 5. The first flange 302 and the second flange 501 are fixedly connected by bolts to fix the cylinder 3 to the lower end cap 2. The first flange 302 and the second flange 501 abut against each other, allowing the top wall of the lower tube sheet 5 to extend into the interior of the cylinder 3. The bottom wall of the first flange 302 and the bottom wall of the cylinder 3 are located on the same plane, and the top wall of the lower tube sheet 5 is located above the top wall of the second flange 501.

[0022] In this scheme, the displacement of the top wall of the lower tube sheet 5 extending into the cylinder 3 can be limited by the second flange 501, which makes it easier for operators to judge the depth of the cylinder 3 sleeve.

[0023] In one embodiment of this utility model, the first flange 302 abuts against the second flange 501 to form an annular space 6 between the cylinder 3, the second flange 501, and the lower tube sheet 5. An O-ring 7 is installed in the annular space 6 to enhance the sealing between the cylinder 3 and the lower tube sheet 5.

[0024] In one embodiment of this utility model, the inner wall at the bottom end of the cylinder 3 is provided with an inclined edge 303, and the inclined edge 303 forms an annular space 6 with a triangular cross section between the second flange 501 and the lower tube plate 5.

[0025] In this scheme, when installing the cylinder 3, the O-ring 7 is first placed at the connection between the second flange 501 and the lower tube sheet 5, and then the cylinder 3 is fitted onto the lower tube sheet 5 until the first flange 302 abuts against the second flange 501. During the fitting process between the cylinder 3 and the lower tube sheet 5, the inclined edge 303 of the inner wall of the cylinder 3 can squeeze the O-ring 7 so that the O-ring 7 abuts against the annular space 6, thereby improving the sealing performance and facilitating the installation of the cylinder 3.

[0026] In one embodiment of this utility model, the angle between the inclined edge 303 and the axis of the lower tube sheet 5 is 30°. This ensures sufficient installation space for the O-ring seal 7, and when the inclination angle of the inclined edge 303 is 30°, the compression of the O-ring seal 7 by the inclined edge 303 can make the O-ring seal 7 fit tightly against the outer wall of the lower tube sheet 5, ensuring the sealing performance between the outer wall of the lower tube sheet 5 and the inner wall of the cylinder 3.

[0027] In one embodiment of this utility model, the first flange 302 is fixedly connected to the cylinder 3 as a whole to ensure the structural stability of the cylinder 3; the second flange 501 is fixedly connected to the lower tube sheet 5 as a whole to ensure the structural stability of the lower tube sheet 5.

[0028] In one embodiment of this utility model, the top of the upper end cap 1 is provided with a high-temperature medium inlet 101, the side wall of the cylinder 3 near the upper end cap 1 is provided with a low-temperature medium outlet 304, the side wall of the cylinder 3 near the lower end cap 2 is provided with a low-temperature medium inlet 305, and the side wall of the lower end cap 2 is provided with a high-temperature medium outlet 201. The axis of the low-temperature medium outlet 304, the axis of the low-temperature medium inlet 305, and the axis of the high-temperature medium outlet 201 are all located in the same plane. Multiple baffles 306 are installed inside the cylinder 3 along the axis of the cylinder 3, and adjacent baffles 306 are staggered to ensure heat exchange efficiency.

[0029] The shell-and-tube heat exchanger provided by this utility model has the advantage of being easy to inspect and maintain. In particular, it is easy to replace the heat exchange tube 301 inside the shell 3 when it is damaged. When replacing it, you only need to first loosen the connecting bolts between the first flange 302 and the second flange 502, and then pull out the lower tube sheet 5 and the heat exchange tube 301 for replacement.

Claims

1. A shell-and-tube heat exchanger capable of free expansion, comprising an upper head, a lower head, and a cylindrical body installed between the upper head and the lower head, characterized in that: The cylinder contains multiple heat exchange tubes arranged along its axial direction. An upper tube sheet is fixedly installed on the cylinder near the upper end cap, and the upper tube sheet is bolted to the upper end cap. A lower tube sheet is fixedly installed on the lower end cap near the cylinder. The cylinder is sealed and fitted onto the lower tube sheet. When the cylinder is not fixedly connected to the lower tube sheet, the cylinder can move axially relative to the lower tube sheet. The heat exchange tubes are mounted on the upper and lower tube sheets. A first flange is fixedly installed on the circumferential wall of the cylinder near the lower tube sheet, and a second flange is fixedly installed on the circumferential wall of the lower tube sheet. The first flange and the second flange are bolted together, and the top wall of the lower tube sheet extends into the cylinder. The first flange and the second flange abut against each other to form an annular space between the cylinder, the second flange, and the lower tube sheet. An O-ring is installed in the annular space.

2. The shell-and-tube heat exchanger according to claim 1, characterized in that: The bottom wall of the first flange and the top wall of the cylinder are basically on the same plane, and the top wall of the lower tube sheet is located above the top wall of the second flange.

3. The shell-and-tube heat exchanger according to claim 2, characterized in that: The inner wall at the bottom of the cylinder is provided with an inclined edge that slopes away from the outer wall of the lower tube sheet. The inclined edge, the second flange, and the lower tube sheet form an annular space with a triangular cross-section.

4. The shell-and-tube heat exchanger according to claim 3, characterized in that: The angle between the tilting direction of the inclined edge and the axis of the lower tube sheet is 30°.

5. The shell-and-tube heat exchanger according to claim 1, characterized in that: The first flange is fixedly connected to the cylinder as a whole.

6. The shell-and-tube heat exchanger according to claim 1, characterized in that: The second flange is fixedly connected to the lower tube sheet as a whole.

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